Vertical type vibration dryer

Abstract

 A vertical type vibration dryer comprises a barrel shaped drying vessel (4) vertically mounted, a vibration means (V) for vibrating the drying vessel and a heating means (5) for heating the drying vessel. The vibration means (V) is arranged below the drying vessel (4) and connected with the vessel by means of a mounting means (14). The mounting means comprises a tapered tubing member.

Description

Field of the Invention

[0001] This invention relates to a vertical type vibration dryer wherein a powdery and/or granular materials are fed into a barrel shaped drying vessel vertically mounted and dried by means of both heating and vibrating from external resources.

Description of the Prior Art

[0002] Such structure as shown in Figs. 1 and 2 was already known as the prior art of mounting a vibration means into the vertical type vibration dryer (refer to Japanese utility model laid-open publication No. 13996/1989).

[0003] Vibration means V comprises a pair of vibrators (vibration motors) 13, 13 connected with each other by a tubing member (or a bar block) 12 having a tubing motor base plate 25 on both sides thereof. Such vibration means V is mounted on a jacket bottom plate 19 of the drying vessel 4 through a cylindrical pipe 18 having a big diameter (a vibration means mounting means). That means the vibration means is arranged below the bottom of the drying vessel 4 by welding the tubing member 12 of the vibration means V on the underside of the big diameter pipe 18.

[0004] In this case, vibratory force due to the vertical type vibration dryer will act as rotational movement being combined with up and down action and stress is consequently liable to concentrate into the connecting area where the upper end of the big diameter pipe 18 is being fixed on the bottom plate of the jacket 5 of the drying vessel 4. In particular, up-sizing of the dryer requires a considerably big vibratory force and such trend will increase as a result.

[0005] For such reason, as shown in the Figs. 1 and 2, it became necessary to reinforce in addition by means of extruding the flange part 20a and/or the rib part 20b on the circumferential surface of the upper end of the big diameter pipe 18 and welding such flange part 20a and/or rib part 20b to the bottom plate of the jacket 5. That is to say it became necessary to make a complicate and heavy-duty structure for the purpose of reinforcement of the structural design of the connecting area of the mounting means 18 onto the bottom part of the drying vessel 4.

Summary of the Invention

[0006] Accordingly, it is the object of the present invention to provide a vertical type vibration dryer to which no complicate and heavy-duty structure for reinforcing the connecting area of the vibration means mounting means becomes necessary.

[0007] As a result of the most effective development to solve the foregoing object, the present inventor hits upon a plan of a vertical type vibration dryer provided with the following structure.

[0008] In one aspect of the invention, there is provided a vertical type vibration dryer comprising a barrel shaped drying vessel vertically mounted, a vibration means for vibrating said drying vessel and a heating means for heating said drying vessel, said vibration means including at least two vibrators connected with each other, and said vibration means being arranged below said drying vessel and connected with said drying vessel by means of a mounting means, characterized in that said mounting means comprises a tapered tubing member.

[0009] In another aspect of the invention, there is provided a vertical type vibration dryer comprising a barrel shaped drying vessel vertically mounted, a vibration means for vibrating said drying vessel and a heating means for heating said drying vessel, said vibration means being connected with said drying vessel by a mounting means, characterized in that said vibration means includes a vibrator having unbalanced weights, said weights are unevenly distributed into up and down positions, said vibrator is arranged below said drying vessel and on the axial line of said drying vessel, and said mounting means comprises a tapered tubing member.

[0010] Preferably, the tapered tubing member is conical. Each vibrator may be a mechanical type wherein its vibration part is driven by a prime mover through a transmission means.

[0011] The vertical type vibration dryer of the invention has the vibration means which includes at least two vibrators connected with each other, and is arranged below the drying vessel and connected with the drying vessel by means of a mounting means comprising a tapered tubing member, thus has the following technical advantages:

[0012] The vibration means is directly connected with the bottom of the drying vessel by the tapered tubing member, so that its vibration movement consisting of rotational action being combined with up and down action is to be directly transmitted along a taper surface of the tapered tubing member and transmission efficiency of vibration energy consequently become better. For such reasons, a relatively small output (power) could be applied as the vibration means. In addition, a change of the outside circumferential surface where the vibration mounting means is connected with the bottom of the drying vessel is gentle and no stress concentration to such connecting area occurs.

[0013] Consequently, structural design reinforced becomes unnecessary substantially or could be simplified and lightened in comparison with conventional structure with respect to such connecting area between the vibration means mounting means and drying vessel. That is to say down-sizing of the dryer becomes possible as whole and a large sized the vertical type vibration dryer could easily be designed and fabricated.

[0014] Owing to the fact that the vibration means mounting means is made taking the tapered tubing shape as described, the lower part of the mounting means becomes slenderer and stress concentration at the connecting area between the bottom of the drying vessel and the mounting means could be lightened as described, a vertical type vibration dryer having three or more sets of the vibrators as the vibration means becomes easy to design. Vibration power could relatively be increased by less power and such large sized vertical type vibration dryer as will not be operated vibrationally due to insufficient vibration power by two sets of vibrators in conventional type could also be designed and fabricated easily.

[0015] By reason that a mechanical type vibrator is applied wherein vibration part is driven with a prime mover by means of a transmission unit, gravity imposed to the tapered tubing member could be lightened in comparison with that by using a vibration motor and less output operation could be attained and up-sizing and energy saving operation of the vertical type vibration dryer becomes much easier by involving in the foregoing function and/or effect.

[0016] In the other vertical type vibration dryer of the invention, the vibration means comprises a vibrator wherein unbalanced weights are distributed into up and down positions and such vibrator is arranged on the axial line below the bottom of the drying vessel by using the vibration means mounting means which comprises the tapered tubing member, transmission efficiency of vibratory energy from the vibrator to the vessel could be economized and further energy saving operation could become possible.

[0017] Summarizing the advantages of the invention, the following is obtained. (1) By decreasing a whole wight of the vertical type vibration dryer against powdery material weight to be treated with, power required becomes less and labor saving/energy saving could be attained and cost could be reduced as a result. (2) Operation hours could be reduced in comparison with conventional type and operational efficiency gets higher and cost could be reduced as a result. (3) By lightening the dryer weight and increasing vibration power, a vertical type vibration dryer of the bigger size could easily be fabricated.

Brief Description of the Drawings

[0018] 

Fig. 1 is the front sectional view showing the conventional vertical type vibration dryer.

Fig. 2 is the side sectional view showing the vibration dryer of Fig. 1.

Fig. 3 is the front sectional view showing a preferred embodiment of the vertical type vibration dryer according to the invention.

Fig. 4 is the side sectional view showing the vibration dryer of Fig. 3.

Fig. 5 is the front sectional view showing four vibrators in the vibration means.

Fig. 6 is the outline view taken on line 6-6 of Fig. 5.

Fig. 7 is the front sectional view showing a mechanical vibrator.

Fig. 8 is the outline view taken on line 8-8 of Fig. 3.

Fig. 9 is the front sectional view showing another preferred embodiment of the vertical type vibration dryer according to the invention.

Detailed Description of the Preferred Embodiments

[0019] Now, preferred embodiments of the invention will be described in further detail with reference to the accompanying drawings.

[0020] Fig. 3 and Fig. 4 are the sectional view showing a preferred embodiment of the vertical type vibration dryer according to the invention. The vibration dryer comprises a barrel shaped drying vessel 4 vertically mounted, a vibration means for vibrating the drying vessel 4 and heating means 5 (such as a heating jacket) for heating the drying vessel.

[0021] The drying vessel 4 has a bracket 3 on the bottom. The bracket 3 includes a cylindrical side wall 3a and base plates 3b attached to the lower end of the side wall 3a. The drying vessel 4 is supported on a stand 1 through elastic bodies 2. In the embodiment, a compressive coil spring is used as the elastic body 2. Other materials such as a plate spring and rubber may be used. In the embodiment, four compressive coil springs are used, but three compressive coil springs or five or more compressive coil springs may be used.

[0022] From the viewpoint of its heat efficiency, the drying vessel 4 is provided with the center protruding inner barrel 6 forming heat wall surface at the center bottom part of the drying vessel 4 wherein its center part swells. Heating jacket 5 surrounds bottom and side surface of the drying vessel 4 so as to build up a heating fluid passage in which fluid such as steam and/or hot water is circulated. Other heating means such as coils being wound round the drying vessel 4 which are for resistance heating and/or induction heating could also be applied. Further, a microwave oscillator put on the ceiling could be used jointly with the microwave heating or a chemical reactive heating element could be wound round the drying vessel 4.

[0023] A discharge valve 7 is mounted on an opening in the bottom of the jacket 5. A dust collecting means D is provided on the ceiling, and the dust collecting means D includes a manhole 9, built-in filter 10 and vapor discharge port 11. In this dust collecting means D, vacuum suction means (not shown) is connected through the vapor discharge port 11.

[0024] The vibration means V comprises a pair of vibrators or vibration motors 13 which are connected with each other by tubing member 12. The tubing member 12 has a base plate 25 on both sides thereof, and the vibration motor 13 is fixed on the base plate by welding or binding. The vibration means V is connected with the bottom of the drying vessel 4 by a mounting means 14. The mounting means 14 comprises a tapered tubing member, the diameter of which decreases gradually in the downward direction. In the embodiment, the tubing member is conical. Tubing members having other shapes such as elliptical or polygonal shape in cross sections can be used. The shown tubing member includes two parts, i.e., an upper part and a lower part. The upper edge of the upper part is jointed to the heating jacket 5 by welding or binding, and the lower edge of the lower part is jointed to the tubing member 12 by welding or binding. The inner diameter of the upper edge of the upper part is substantially same as the outer diameter of the heating jacket 5. Flanges 14b are formed on the lower edge of the upper part and the upper edge of the lower part. The upper part and the lower part are jointed by welding or binding the flanges 14b. The flanges 14b can be also jointed to the base plates 3b of the bracket 3. In the lower portion of the lower part of the mounting means 14, there is provided a conical reinforcement plate 14a.

[0025] The mounting means 14 is preferably conical shape by the reason that stress concentration could rarely happen there. The taper angle may be 20° to 60°, preferably 30° to 45°. If too small angle is taken, the dryer height relatively gets higher and it is not desirable from the viewpoints of saving-space and stability of the dryer. Too big angle is liable to bring a lack of strength against vibration up and down and it consequently needs increasing the plate thickness of the tapered tubing member.

[0026] In the foregoing embodiment, the vibration means is composed of a pair of vibration motors 13 connected together by using the tubing member 12, while it could be structured, as shown in Figs. 5 and 6, by means of two pairs of the tubing member 12A formed into a cross that is four sets of the motors 14 in total, when a considerably big vibration output is required. In this case, a big type vibration dryer could be operated by using a small motor which is relatively maintainable (maintainable and/or inspectable) and has a good durability in comparison those of a big type of motor.

[0027] Further, it is also possible to structure the vibration means not only by using four sets of vibration motors but also by three sets of vibration motors by using the tubing member formed into Y shaped cross and/or by five or more sets of vibration motors through the tubing member extending radially from the center part corresponding to number of the motors.

[0028] In the foregoing embodiment, a vibration motor system is applied as the vibrator 13, while an electromagnetic system is also applicable and, as shown in Fig. 7, a mechanical system is more desirable for the purpose of lightening gravity imposed to the vibration means mounting means. In the embodiment shown in Fig. 7, a vibration part 13A is mounted on both sides of the tubing member 12, the vibration part has unbalance weights on both sides thereof, and the vibration part 13A is driven by the prime mover (electromotor) 17 through the transmission unit such as free-coupling (an universal joint) 16 or belt/pulley.

[0029] It is also desirable to provide the discharge baffle (a baffle board and guide weir) 8 against such discharge port 21 on the bottom of the drying vessel 4. In this case, such discharge baffle 8 may be straight but, as shown in Fig. 8, such shape as will be curved taking the form of concave against a revolution direction is desirable to obtain a better discharging effect. Height of such discharge baffle 8 depends on volume of the drying vessel, kind of the powdery material to be fed and its particle size, while it is 10 - 100 mm usually and 20 - 50 mm preferably. Too high baffle 8 might disturb an even fluidity of the powdery and/or granular material when vibratory drying.

[0030] Fig. 9 shows another preferred embodiment of the invention, which is the sectional view of the side face. Regarding same elements as those of the foregoing preferred embodiment, we put same number thereon and abbreviate its description in whole or in part.

[0031] Similarly to the foregoing vertical type vibration dryer, the embodiment shown in Fig. 9 is also provided with the barrel shaped vertical type drying vessel 4, a vibration means V for vibrating the drying vessel 4 and heating means for heating the drying vessel 4. In Fig. 9, 26 shows a vacuum suction part, 27 shows a superheated stream inlet port and 28 shows a drain plug.

[0032] In the embodiment shown in Fig. 9, a vibration means comprises a vibrator (vibration motor) 13A having unbalance weights 23a and 23b which are unevenly distributed into up and down positions. The vibrator 13A is arranged below the drying vessel 4 and on the axial line of the drying vessel 4. The vibrator 13A is connected with the vessel 4 by a mounting means 14 which comprises a tapered tubing member. The vibrator 13A is positioned on the axial line of the vessel 4 so that transmission efficiency of vibration energy to the vessel 4 is very high. The vibrator 13A may be a mechanical type as shown in Fig. 7.

[0033] Operation of the vibration dryer will be described with reference to Figs. 3 and 4. Powdery and/or granular materials to be treated with are fed through the feeding inlet at first at the rate of 50 - 80 volume percent of the drying vessel, preferably 60 - 70 volume percent. After that, the vibration motor 13 is energized to vibrate the drying vessel 4, and simultaneously heating fluid at an appointed temperature such as steam (pressurized and/or decompressed) and/or hot water is circulated through the jacket 5. Further, the vacuum pump (not shown) is energized to create a vacuum in the drying vessel 4. The materials to be treated with are, as shown in Fig. 8, dried by being revolved to the arrow direction while vibratory flowing within a circular space between the center inner barrel 6 and drying vessel 4. The discharge baffle 8 does not exert bad effects on vibratory drying process, because its height is low. Vibration energy from the vibration motor 13 is transmitted to the drying vessel 4 through the tapered tubing member 14 efficiently. After passing an appointed hours and finishing the drying process to be required, the discharge valve 7 is opened and powdery and/or granular materials are discharged through the discharge port 21. Discharge of powdery and/or granular materials through the discharge port 21 gets smoother at the terminal period of the discharge owing to the existence of the discharge baffle 8 and a complete discharge could be attained in a short time as a result in comparison to conventional type.

Claims

1. A vertical type vibration dryer comprising a barrel shaped drying vessel vertically mounted, a vibration means for vibrating said drying vessel and a heating means for heating said drying vessel, said vibration means including at least two vibrators connected with each other, and said vibration means being arranged below said drying vessel and connected with said drying vessel by means of a mounting means, characterized in that said mounting means comprises a tapered tubing member.

2. The vertical type vibration dryer according to claim 1, characterized in that said tapered tubing member is conical.

3. The vertical vibration dryer according to claim 1 or 2, characterized in that said vibration means includes four vibrators.

4. The vertical type vibration dryer according to claim 1, each vibrators is a mechanical type wherein its vibration part is driven by a prime mover through a transmission means.

5. A vertical type vibration dryer comprising a barrel shaped drying vessel vertically mounted, a vibration means for vibrating said drying vessel and a heating means for heating said drying vessel, said vibration means being connected with said drying vessel by a mounting means, characterized in that said vibration means includes a vibrator having unbalanced weights, said weights are unevenly distributed into up and down positions, said vibrator is arranged below said drying vessel and on the axial line of said drying vessel, and said mounting means comprises a tapered tubing member.

6. The vertical type vibration dryer according to claim 5, said tapered tubing member is conical.

7. The vertical type vibration dryer according to claim 5 or 6, said vibrator is a mechanical type wherein its vibration part is driven by a prime mover through a transmission means.

Drawing