NUCLEAR POWER PLANT PERSONNEL AIRLOCK BUFFERING DEVICE

Abstract

 A nuclear power plant personnel gate buffer device includes: a chuck structural member, fixed on a door frame and including an electromagnetic chuck and a chuck base plate that are fixedly connected, the chuck base plate being provided with sliding plates at two sides thereof, the electromagnetic chuck and the chuck base plate connected together being capable of moving up and down along the sliding plates, and the electromagnetic chuck being connected to a power supply for controlling the power supply time of the electromagnetic chuck; and a suction plate structural member, fixed on a door plate and including a suction plate, a suction plate connecting plate and a door plate connecting plate, the suction plate being fixed on the suction plate connecting plate, with a first spring being arranged between the suction plate connecting plate and the door plate connecting plate, the first spring being provided with a first mandrel therein, one end of the first mandrel being fixed to the suction plate connecting plate, the other end of the first mandrel passing through the door plate connecting plate and arranging the first spring between the suction plate connecting plate and the door plate connecting plate by an auxiliary member; wherein the chuck structural member and the suction plate structural member can be attacted to be locked or opened.

Description

FIELD OF THE INVENTION

[0001] The present invention generally relates to nuclear power plants and, more particularly, relates to a nuclear power plant personnel gate buffer device.

BACKGROUND OF THE INVENTION

[0002] The main function of a personnel gate of a nuclear power plant is to allow personnel and small equipment to pass during the operation or thermal shutdown of the reactor, without damaging the sealing function of the containment. Under special circumstances, the personnel gate also has the following functions: under accident conditions, acting as an emergency evacuation exit for personnel; during a cold shutdown, the gates are unlocked, and the internal and external doors are opened at the same time, which can be used as a passage for personnels and small equipment to enter and exit the containment; being used as a pressurization/decompression chamber during sealing and strength testing.

[0003] The structure of the personnel gate includes a cylinder, two sealing doors (inside and outside), a lifting door step, a passage bottom plate. The personnel gate includes a transmission mechanism, an interlocking mechanism, a pressure balance mechanism, a locking mechanism, and an outer door hinge mechanism, inner door hinge mechanism, jacking mechanism to drive these structures. During the closing process of the sealing door of the personnel gate, the door plate rotates and closes at a certain rate. At the moment the door plate contacts the door frame, there is a large rebound force and rebound displacement. The conventional buffer mechanism cannot sufficiently buffer the impact force of the door plate, causing the sealed door to rebound and resulting in an undesirable sealing performance after the sealing door of the personnel gate is closed. At the same time, the instantaneous rebound impact when the sealing door is closed affects the service life of the transmission mechanism. Since the personnel gate is part of the pressure-bearing boundary of the nuclear containment and runs through the inner and outer containment, the improper closing of the sealing door may cause the failure of the pressure-bearing boundary of the nuclear containment and cause serious consequences.

[0004] In view of the foregoing, what is needed, therefore, is to provide a nuclear power plant personnel gate buffer device which can ensure the normal closing of the personnel airlock and maintain the integrity of the containment pressure boundary.

SUMMARY OF THE INVENTION

[0005] One object of the present invention is to provide a nuclear power plant personnel gate buffer device which can ensure the normal closing of the personnel airlock and maintain the integrity of the containment pressure boundary.

[0006] According to one embodiment of the present invention, a nuclear power plant personnel gate buffer device includes:

a chuck structural member fixed on a door frame and including an electromagnetic chuck and a chuck base plate that are fixedly connected, the chuck base plate being provided with sliding plates at two sides thereof, the electromagnetic chuck and the chuck base plate connected together being capable of moving up and down along the sliding plates, and the electromagnetic chuck being connected to a power supply for controlling the power supply time of the electromagnetic chuck; and

a suction plate structural member, fixed on a door plate and including a suction plate, a suction plate connecting plate and a door plate connecting plate, the suction plate being fixed on the suction plate connecting plate, with a first spring being arranged between the suction plate connecting plate and the door plate connecting plate, the first spring being provided with a first mandrel therein, one end of the first mandrel being fixed to the suction plate connecting plate, the other end of the first mandrel passing through the door plate connecting plate and arranging the first spring between the suction plate connecting plate and the door plate connecting plate by an auxiliary member;

wherein the chuck structural member and the suction plate structural member can be attacted to be locked or opened.

[0007] According to one aspect of the present invention, chuck structural member includes an upper baffle at an upper end of the sliding plate and a lower baffle at a lower end of the sliding plate, a second spring is provided under the chuck base plate, and the second spring is provided with a second mandrel therein, one end of the second mandrel is fixedly connected to the chuck base plate, and the other end of the second mandrel passes through the lower baffle, and the second spring is located between the chuck base plate and the lower baffle.

[0008] According to one aspect of the present invention, slinding plate is provided with sliding grooves at one side thereof adjacent to the chuck base plate, the chuck base plate is provided with guide rails at two sides thereof, the guide rails are respectively embedded in the sliding grooves of the sliding plate and move axially along the sliding grooves.

[0009] According to one aspect of the present invention, the sliding plate is provided with groove bearings at one side thereof adjacent to the chuck base plate, the chuck base plate is provided with guide rails at two sides thereof, the guide rails are respectively located in the grooves of the groove bearings, and the chuck base plate can move axially via the guide rails and the groove bearings.

[0010] According to one aspect of the present invention, chuck base plate is provided with groove bearings at two sides thereof, the sliding plate is provided with guide rails at one side thereof adjacent to the chuck base plate, the guide rails are located in the grooves of the groove bearings, and the chuck base plate can move axially via the groove bearings and the guide rails.

[0011] According to one aspect of the present invention, the sliding plate is respectively connected to the upper baffleand the lower baffle by bolts or welding.

[0012] According to one aspect of the present invention, a stroke of the chuck structural member after being compressed on the second spring is not less than a stroke of the door plate.

[0013] According to one aspect of the present invention, the auxiliary member is a nut or a pin, when the auxiliary member is a nut, the first mandrel acts as a bolt, and the first mandrel passes through the door plate connecting plate and is fixedly connected with the nut; when the auxiliary member is a pin, the first mandrel is provided with a pin hole at one end outside the door plate connecting plate, and the pin is inserted into the pin hole after the first mandrel passes through the door plate connecting plate.

[0014] According to one aspect of the present invention, after the nuclear power plant personnel gate buffer device is assembled, a distance between a bottom surface of the door plate connecting plate and a bottom surface of the sliding plate is greater than a thickness of the door plate.

[0015] According to one aspect of the present invention, the electromagnetic chuck and the chuck base plate are fixedly connected by bolts, welding, bonding or clamps.

[0016] According to one aspect of the present invention, the suction plate and the suction plate connecting plate are fixedly connected by bolts, welding, bonding, nesting or clamps.

[0017] According to one aspect of the present invention, the chuck structural member is fixed on the door frame by bolts, welding, bonding, structural nesting or clamps.

[0018] According to one aspect of the present invention, the suction plate structural member is fixed on the edge of the door plate by bolts, welding, bonding, structural nesting or clamps.

[0019] Compared with the prior art, the nuclear power plant personnel gate buffer device of the present invention has the following advantages:

1) The nuclear power plant personnel gate buffer device has simple structure and can be designed conveniently;

2) The problem of rebound force and rebound displacement caused by excessive horizontal impact force when closing the sealing door is solved. The sealing door can be closed normally, the sealing of the gate equipment is guaranteed, and the integrity of the containment pressure boundary is maintained.

3) The vertical sliding between the sealing door and the door frame is avoided, thereby reducing the friction and wear of the original buffer device.

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The nuclear power plant personnel gate buffer device of the present invention will now be described in detail below with reference to the accompanying drawings, in which:

Fig. 1 is a perspective veiw of a chuck structural member of a nuclear power plant personnel gate buffer device according to one embodiment of the present invention;

Fig. 2 is a cross-sectional veiw of a chuck structural member of a nuclear power plant personnel gate buffer device according to one embodiment of the present invention along a line B-B in Fig. 1;

Fig. 3 is a perspective veiw of a suction plate structural member of a nuclear power plant personnel gate buffer device according to one embodiment of the present invention; and

Fig. 4 is an assembled view of the nuclear power plant personnel gate buffer device according to one embodiment of the present invention.

12--chuck structural member; 120--electromagnetic chuck; 122--chuck base plate; 1220--guide rail; 124--sliding plate; 1240--sliding groove; 126--upper baffle; 128--lower baffle; 130--second spring; 132--second mandrel; 14--suction plate structural member; 140--suction plate; 142--suction plate connecting plate; 144--door plate connecting plate; 146--first spring; 148--first mandrel; 150--nut; 20--door frame; 30--door plate.

DETAILED DESCRIPTION OF THE INVENTION

[0021] In order to make the objective, technical solutions and technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are only for explaining the present invention, not for limiting the scope of the present invention.

[0022] Referring to Figs. 1 to Fig. 4, the nuclear power plant personnel gate buffer device of the present invention includes:

a chuck structural member 12, fixed on a door frame 20 and including an electromagnetic chuck 120 and a chuck base plate 122 that are fixedly connected, two sides of the chuck base plate 122 being provided with sliding plates 124, the electromagnetic chuck 120 and the chuck base plate 122 connected together being capable of moving up and down along the sliding plates 124, and the electromagnetic chuck 120 being connected to a power supply (not shown) for controlling the power supply time of the electromagnetic chuck 120; and

a suction plate structural member 14, fixed on a door plate 30 and including a suction plate 140, a suction plate connecting plate 142 and a door plate connecting plate 144, the suction plate 140 being fixed on the suction plate connecting plate 142, and a first spring 146 being arranged between the suction plate connecting plate 142 and the door plate connecting plate 144, the first spring 146 being provided with a first mandrel 148 therein, one end of the first mandrel 148 being fixed to the suction plate connecting plate 142, the other end of the first mandrel 148 passing through the door plate connecting plate 144 and arranging the first spring 146 between the suction plate connecting plate 142 and the door plate connecting plate 144 by an auxiliary member;

wherein the chuck structural member 12 and the suction plate structural member 14 can be attacted to be locked or opened.

[0023] Referring to Figs. 1 to 2, the chuck structural member 12 is fixed on the door frame 20 by bolts, welding, bonding, structural nesting or clamps. In the illustrated embodiment, the chuck structural member 12 is detachably fixed on the door frame 20 by bolts. The electromagnetic chuck 120 is a commonly used chuck in the prior art, such as an electromagnetic chuck of a household access control system. A coil is arranged in the electromagnetic chuck 120 to generate magnetic force and tightly suck the suction plate 140 contacting the surface of the electromagnetic chuck 120. Demagnetization is achieved by power off the coil to make the magnetic force disappear. In the illustrated embodiment, the electromagnetic chuck 120 has a cuboid structure and the surface thereof has a plane structure.

[0024] The chuck base plate 122 is a rectangular plate located at lower part of the electromagnetic chuck 120 and fixedly connected to the electromagnetic chuck 120 by bolts, welding, bonding, nesting or clamps. In the illustrated embodiment, the chuck base plate 122 is fixedly connected with the electromagnetic chuck 120 by bolts. Guide rails 1220 are provided on both sides of the chuck base plate 122.

[0025] There are two sliding plates 124, which are mainly used to solve the problem of vertical movement when the door is closed. The sliding plates 124 are located on two sides of the chuck base plate 122. The upper end of the sliding plate 124 is provided with an upper baffle 126, and the lower end of the sliding plate 124 is provided with a lower baffle 128. A second spring 130 is provided under the chuck base plate 122, and the second spring 130 is provided with a second mandrel 132 therein. One end of the second mandrel 132 is fixedly connected to the chuck base plate 122 by welding, and the other end of the second mandrel 132 passes through the lower baffle 128 can move up and down. The second spring 130 is located between the chuck base plate 122 and the lower baffle 128.

[0026] More specifically, the sliding plate 124 is a strip-shaped plate with a certain thickness, and has a length greater than the length of the chuck base plate 122 and the electromagnetic chuck 120. The two sliding plates 124 are provided with bolt holes at symmetrical positions and are fixed on the door frame 20 by bolts, so that the entire chuck structural member 12 is fixed on the door frame 20. The upper baffle 126 and the lower baffle 128 are also elongated plates, and the upper baffle 126 and the lower baffle 128 may have same size or different sizes, preferably the same size. The upper baffle 126 and the lower baffle 128 each have a thickness substantially the same as that of the sliding plate 124. The upper baffle 126 and the lower baffle 128 are detachably and fixedly connected to the sliding plate 124. After being fixedly connected, the ends of the upper baffle 126 and the lower baffle 128 are flush with the edge of the sliding plate 124.

Embodiment 1

[0027] Referring to Fig. 2, the thickness of the sliding plate 124 is greater than the thickness of the chuck base plate 122. The sliding plate 124 is provided with a sliding groove 1240 at a side close to the chuck base plate 122. The sliding groove 1240 is preferably located in the middle of the thickness direction of the sliding plate 124 and extends to both ends thereof. Two sides of the chuck base plate 122 are provided with guide rails 1220. The guide rails 1220 are located on the upper part of the chuck base plate 122. The thickness of the guide rails 1220 is slightly smaller than the width of the sliding groove 1240. The guide rails 1220 are respectively embedded in the sliding grooves 1240, and can move axially along the sliding grooves 1240.

[0028] Due to the guide rails 1220 arranged on two sides of the chuck base plate 122, the width of the chuck base plate 122 is greater than the distance between two adjacent sliding plates 124, so that the chuck base plate 122 will not falls off from the sliding grooves 1240 when moving up and down along the sliding grooves 1240. At the same time, the bottom of the chuck base plate 122 is higher than the bottom of the sliding plate 124, thereby keeping a gap with the bottom door frame to facilitate sliding. After the electromagnetic chuck 120 is fixed on the chuck base plate 122 by bolts, the width of the electromagnetic chuck 120 is slightly smaller than the distance between two adjacent sliding plates 124, so that the entire electromagnetic chuck 120 and the chuck base plate 122 can move up and down along the sliding grooves 1240 in the adjacent two sliding plates 124.

Embodiment 2

[0029] The sliding plate 124 is provided with groove bearings (not shown) on the side adjacent to the chuck base plate 122. Specifically, some groove bearings are arranged on the sliding plate 124 via mounting brackets at intervals. The guide rails (not shown) are arranged on two sides of the chuck base plate 122. The guide rails on two sides of the chuck base plate 122 are located in the grooves of the groove bearings (not shown) respectively. The chuck base plate 122 is adapted to the groove bearings through the guide rails on two sides to realize the movement along the axial direction.

[0030] At the same time, some grooves (not shown) for receiving the groove bearing can be provided on one side of the sliding plate 124 adjacent to the chuck base plate 122, the groove bearing (not shown) is fixed in the groove by a fixed shaft (not shown), and the groove bearing can rotate in the groove. The guide rails (not shown) are arranged on two sides of the chuck base plate 122, and the guide rails on two sides are respectively located in the groove of the groove bearing (not shown). The chuck base plate 122 is adapted to the groove bearing through the guide rails on both sides, so as to realize axial movement.

Embodiment 3

[0031] Embodiment 3 is almost the same as Embodiment 2, except that groove bearings (not shown) are provided on two sides of the chuck base plate 122, and the sliding plate 124 is provided with a guide rail (not shown) at one side adjacent to the chuck base plate 122. The guide rail is located in the groove of the groove bearing, and the chuck base plate 122 can move axially through the groove bearing and the guide rail.

[0032] Groove bearings (not shown) can be fixed on two sides of the chuck base plate 122 by mounting brackets at intervals, or by providing grooves on two sides of the chuck base plate 122. The groove bearings can be positioned through a fixed shaft, as has beeen detailed in Embodiment 2.

[0033] One end of the second mandrel 132 is welded or screwed to the bottom of the chuck base plate 122. In the illustrated embodiment, two second mandrels 132 are arranged side by side, and are symmetrically welded and fixed to the bottom of the chuck base plate 122. The second mandrel 132 has a cylindrical structure, and each second mandrel 132 is sleeved with a second spring 130. In other embodiments of the present invention, the number of the second mandrels 132 can be adjusted according to actual requirement. Two through holes corresponding to the two second mandrels 132 are provided on the lower baffle 128. After one end of the second mandrel 132 is welded to the bottom of the chuck base plate 122, the other end of the second mandrel 132 extends out from the through hole. When the the fixed electromagnetic chuck 120 and chuck base plate 122 moves up and down as a whole, the second mandrel 132 can move up and down freely in the through hole.

[0034] The second spring 130 is set around the second mandrel 132 and is located between the bottom of the chuck base plate 122 and the lower baffle 128. The length of the second spring 130 in the relaxed state is equal to or slightly longer than the distance between the bottom of the chuck base plate 122 and the upper part of the lower baffle 128. When the door plate 30 is in contact with the door frame 20, the door plate 30 and the door frame 20 as a whole need to slide downward. The second spring 130 is used to buffer the vertical sliding and reset the sealed door after it is opened. The second mandrel 132 is used for positioning the up and down sliding of the chuck base plate 122 and the electromagnetic chuck 120 after being fixed as a whole. The stroke of the chuck structural member 12 after being compressed on the second spring 130 is not less than the stroke of the door plate 30.

[0035] Referring to Figs. 3 and 4, the suction plate structural member 14 is fixed on the edge of the door plate 30 by bolts, welding, bonding, structural nesting or clamps. In the embodiment as illustrated, the suction plate structural member 14 is detachably fixed on the edge of the door plate 30 via bolts. Bolt holes are opened on the door plate connecting plate 144, then fixed on the door plate 30 by bolts, and finally the entire suction plate structural member 14 is fixed on the door plate 30.

[0036] The suction plate 140 and the suction plate connecting plate 142 are fixed by bolts, welding, bonding, nesting or clamps. In the illustrated embodiment, the suction plate 140 and the suction plate connecting plate 142 are detachably connected by bolts, and the suction plate 140 is a flat plate having a size corresponding to that of the electromagnetic chuck 120. When the sealing door is closed, the suction plate 140 is attracted to the electromagnetic chuck 120, and the suction plate 140 just matches the electromagnetic chuck 120. The suction plate connecting plate 142 is a rectangular plate having a length and width greater than that of the suction plate 140. The suction plate 140 is fixed to the center of the suction plate connecting plate 142 by bolts. After fixing, two ends of the suction plate 140 are separated from corresponding ends of the suction plate connecting plate 142 via an equal distance.

[0037] The door plate connecting plate 144 is a square plate, having a width greater than the width of the suction plate connecting plate 142 and a length substantially the same as the length of the suction plate connecting plate.

[0038] One side of the door plate connecting plate 144 is provided with a fixing hole for inserting the first mandrel 148, and the other side of the door plate connecting plate 144 is provided with a bolt hole for inserting bolt to fix the door plate 30. In the illustrated embodiment, the door plate connecting plate 144 is fixed to the edge of the door plate 30 by bolts. One end of the first mandrel 148 is connected to the suction plate connecting plate 142, the other end of the first mandrel 148 passes through the fixing hole of the door plate connecting plate 144 and is connected by an auxiliary member. A first spring 146 is set around the first mandrel 148. After the first spring 146 is set around the first mandrel 148, the first spring 146 is located between the suction plate connecting plate 142 and the door plate connecting plate 144 for buffering. In the embodiment as illustrated, the auxiliary member is a nut 150, and the first mandrel 148 is a bolt, with one end being connected to the suction plate connecting plate 142, and the other end passing through the fixing hole of the door plate connecting plate 144 and connected by the nut 150, to sandwich the first spring 146 between the suction plate connection plate 142 and the door plate connecting plate 144, to limit the extension and contraction of the first spring 146 and further define the distance between the suction plate connecting plate 142 and the door plate connecting plate 144. In other embodiments of the present invention, one end of the first mandrel 148 extending through the fixing hole of the door plate connecting plate 144 is provided with a pin hole, with one end being connected to the suction plate connecting plate 142, and the other end with the pin hole passing through the fixing hole of the door plate connecting plate 144, to further sandwich the first spring 146 between the suction plate connecting plate 142 and the door plate connecting plate 144 by inserting a pin.

[0039] Referring to Figs. 3 and 4, the first spring 146 is used for horizontal impact buffering. When the door plate 30 is closed, it will rotate to the door frame 20 at a certain rate to impact close, and the buffer device can fully absorb this part of the kinetic energy. Therefore, during design, after the buffer device is assembled, the distance between the bottom surface of the door plate connecting plate 144 and the bottom surface of the sliding plate 124 (i.e., the distance between the bottom surface of the door plate connecting plate 144 and the door frame 20) is greater than the thickness of the door plate 30, so as to reduce the impact force of the door plate 30 on the door frame 20. The impact force has been reduced by the time of contact, and the impact force of the door plate 30 can be fully absorbed.

[0040] In addition, the electromagnetic chuck 120 is powered during the buffering process, and the chuck structural member 12 and the suction plate structural member 14 are closely attached to each other, which can limit the rebound displacement of the door plate 30.

[0041] Since the suction plate structural member 14 is formed with the first spring 146 for compression buffering, after the door plate 30 is opened, the suction plate structural member 14 can be quickly reset without affecting the reuse thereof. Since the chuck base plate 122 is provided with the second spring 130 for compression buffering thereunder, after the door plate 30 is opened, the electromagnetic chuck 120 and the suction plate connecting plate 142 can be quickly reset without affecting the reuse of the chuck structural member 12.

[0042] At the same time, via controlling the power switch, the power supply time of the electromagnetic chuck 120 is controlled. Before or when the door plate 30 contacts the door frame 20, the electromagnetic chuck 120 is powered, so that the electromagnetic chuck 120 and the suction plate 140 are tightly chucked. After the electromagnetic chuck 120 and the suction plate 140 are held tightly for a period of time (does not exceed the total vertical sliding time of the gate), the power is turned off. At this time, the electromagnetic chuck 120 has no suction, and the door plate 30 can continue falling movement. At the same time, the electromagnetic chuck 120 is an electronic product. If the electromagnetic chuck 120 is energized for a long time, its service life will be affected. Therefore, after the door plate 30 is closed in place, the electromagnetic chuck 120 is powered off without affecting its service life.

[0043] Compared with the prior art, the nuclear power plant personnel gate buffer device of the present invention has the following advantages:

1) The nuclear power plant personnel gate buffer device has simple structure and can be designed conveniently;

2) The problem of rebound force and rebound displacement caused by excessive horizontal impact force when closing the sealing door is solved. The sealing door can be closed normally, the sealing of the gate equipment is guaranteed, and the integrity of the containment pressure boundary is maintained.

3) The vertical sliding between the sealing door and the door frame is avoided, thereby reducing the friction and wear of the original buffer device.

[0044] Many modifications and other embodiments of the inventions set forth herein will come to mind to one skilled in the art to which these inventions pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Moreover, although the foregoing descriptions and the associated drawings describe example embodiments, it should be appreciated that alternative embodiments without departing from the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A nuclear power plant personnel gate buffer device, characterized in that the nuclear power plant personnel gate buffer device comprises:

a chuck structural member (12), fixed on a door frame (20) and comprising an electromagnetic chuck (120) and a chuck base plate (122) that are fixedly connected, the chuck base plate (122) being provided with sliding plates (124) at two sides thereof, the electromagnetic chuck (120) and the chuck base plate (122) connected together being capable of moving up and down along the sliding plates (124), and the electromagnetic chuck (120) being connected to a power supply for controlling the power supply time of the electromagnetic chuck (120); and

a suction plate structural member (14), fixed on a door plate (30) and comprising a suction plate (140),

a suction plate connecting plate (142) and a door plate connecting plate (144), the suction plate (140) being fixed on the suction plate connecting plate (142), with a first spring (146) being arranged between the suction plate connecting plate (142) and the door plate connecting plate (144), the first spring (146) being provided with a first mandrel (148) therein, one end of the first mandrel (148) being fixed to the suction plate connecting plate (142), the other end of the first mandrel (148) passing through the door plate connecting plate (144) and arranging the first spring (146) between the suction plate connecting plate (142) and the door plate connecting plate (144) by an auxiliary member;

wherein the chuck structural member (12) and the suction plate structural member (14) can be attacted to be locked or opened.

2. The nuclear power plant personnel gate buffer device of claim 1, characterized in that the chuck structural member (12) comprises an upper baffle (126) at an upper end of the sliding plate (124) and a lower baffle (128) at a lower end of the sliding plate (124), a second spring (130) is provided under the chuck base plate (122), and the second spring (130) is provided with a second mandrel (132) therein, one end of the second mandrel (132) is fixedly connected to the chuck base plate (122), and the other end of the second mandrel (132) passes through the lower baffle (128), and the second spring (130) is located between the chuck base plate (122) and the lower baffle (128).

3. The nuclear power plant personnel gate buffer device of claim 2, characterized in that the slinding plate (124) is provided with sliding grooves (1240) at one side thereof adjacent to the chuck base plate (122), the chuck base plate (122) is provided with guide rails (1220) at two sides thereof, the guide rails (1220) are respectively embedded in the sliding grooves (1240) of the sliding plate (124) and move axially along the sliding grooves (1240).

4. The nuclear power plant personnel gate buffer device of claim 2, characterized in that the sliding plate (124) is provided with groove bearings at one side thereof adjacent to the chuck base plate (122), the chuck base plate (122) is provided with guide rails (1220) at two sides thereof, the guide rails (1220) are respectively located in the grooves of the groove bearings, and the chuck base plate (122) can move axially via the guide rails (1220) and the groove bearings.

5. The nuclear power plant personnel gate buffer device of claim 2, characterized in that the chuck base plate (122) is provided with groove bearings at two sides thereof, the sliding plate (124) is provided with guide rails (1220) at one side thereof adjacent to the chuck base plate (122), the guide rails (1220) are located in the grooves of the groove bearings, and the chuck base plate (122) can move axially via the groove bearings and the guide rails (1220).

6. The nuclear power plant personnel gate buffer device of claim 2, characterized in that the sliding plate (124) is respectively connected to the upper baffle (126) and the lower baffle (128) by bolts or welding.

7. The nuclear power plant personnel gate buffer device of claim 2, characterized in that a stroke of the chuck structural member (12) after being compressed on the second spring (130) is not less than a stroke of the door plate (30).

8. The nuclear power plant personnel gate buffer device of claim 1, characterized in that the auxiliary member is a nut (150) or a pin, when the auxiliary member is a nut (150), the first mandrel (148) acts as a bolt, and the first mandrel (148) passes through the door plate connecting plate (144) and is fixedly connected with the nut (150); when the auxiliary member is a pin, the first mandrel (148) is provided with a pin hole at one end outside the door plate connecting plate (144), and the pin is inserted into the pin hole after the first mandrel (148) passes through the door plate connecting plate (144).

9. The nuclear power plant personnel gate buffer device of claim 1, characterized in that after the nuclear power plant personnel gate buffer device is assembled, a distance between a bottom surface of the door plate connecting plate (144) and a bottom surface of the sliding plate (124) is greater than a thickness of the door plate (30).

10. The nuclear power plant personnel gate buffer device of claim 1, characterized in that the electromagnetic chuck (120) and the chuck base plate (122) are fixedly connected by bolts, welding, bonding or clamps.

Drawing