JP4512679B2 - Follow plate - Google Patents

Description

  The present invention relates to various liquids such as food materials such as tomato paste and various creams stored in containers such as drums and pail cans, high viscosity liquids such as printing inks, sealants and putty agents, and low viscosity liquids close to water. It is related with the follow plate used for the discharger (discharge device) which is pumped up and discharged | emitted with a pump.

  In this type of follow plate, for example, as shown in FIG. 10, an annular plate-shaped rubber ring 72 is attached to the outer periphery of the follow plate main body 71 so as to protrude slightly larger than the inner diameter of a container P such as a drum can. . In such a follow plate, the work is performed while exhausting from the exhaust hole 73 when inserted into the container P. However, when sitting on the stored liquid T, the liquid may leak from the exhaust hole 73 and splash. It will be dirty and requires careful work. Moreover, since the sealing mechanism 74 of the exhaust hole 73 must be operated and closed while the follow plate 71 is lowered near the bottom of the container, the operation is troublesome. Further, if the stored liquid T is attached to the lower surface of the rubber ring 72 and the stored liquid in another container is to be discharged, the liquid may adhere to the periphery of the opening of the container and the surroundings may be soiled. When the follow plate 71 is taken out from the container P after the end of the above, the bent rubber ring 72 is restored to its original state, and the adhering liquid is scattered around. Furthermore, since the rubber ring 72 is deformed and in close contact with the follower plate 71 that has been lowered to the bottom surface of the container P, the container P may be lifted, and in order to prevent this, the compressed air is purged. It is necessary to provide a hole 75 for this purpose so that compressed air can be introduced into the container P.

  Therefore, as shown in FIG. 11, as a follow plate having another structure, a tube-shaped seal 82 that can be expanded and contracted is provided on the outer periphery of the follow plate main body 81, and the seal 82 is inserted into the container P in a contracted state. A structure in which compressed air is supplied into the seal 82 in a state where it is seated on the stored liquid T to expand the seal 82 and is brought into close contact with the inner peripheral surface of the container P to be sealed is implemented. In the case of this follow plate, the drawbacks of the above follow plate have been eliminated, but in order to maintain the sealing performance with the container, the supply of compressed air must be maintained at all times, and the compressed air source becomes abnormal. Liquid leaks when compressed air in the seal leaks. Reference numeral 83 in FIG. 11 denotes a purge hole, and reference numeral 11 in FIGS. 10 and 11 denotes a pump.

Furthermore, it adheres to a follow plate other than the above between the press plate attached to the upper surface of the follow plate main body and the press plate attached to the bottom plate of the same shape as the follow plate main body, and the bottom plate is a high-viscosity liquid in the container. Only when in contact with the surface, the outer diameter of the pump expands due to the pump's own weight and descending air pressure, and it has an annular sealing material made of elastic rubber that has a larger diameter than the follow plate body and bottom plate. The thing is proposed (for example, refer patent document 1).
JP-A-8-82282 (paragraph numbers 0005 to 0007, FIGS. 1 and 2)

  The follow plate described in the above publication also has problems to be improved in the following points. That is, in order for the sealing material to function, it is necessary to keep the follow plate body pressed downward against the bottom plate to keep it close, and during that time, a descending air pressure must be applied. For this reason, similarly to said follow plate (refer FIG. 10) provided with the tubular seal | sticker, when supply of pressurized air stops, there exists a possibility that a stored liquid may leak. Further, since a large number of screw members are required for mounting the sealing material, and the liquid adheres to the mounting location, it is unsanitary and unsuitable for transferring food.

  The present invention has been made in view of the above points, and has a good sealing property with respect to the inner peripheral surface of the container, can exhibit a sealing property in a state where compressed air is not supplied, that is, no pressure is applied, and liquid leakage is unlikely to occur. The purpose is to provide a follow plate that is easy to operate.

  Another object of the present invention is to prevent the seal and its surroundings from becoming dirty by avoiding contact between the inner peripheral surface and the seal in the process of attaching and removing the follow plate into the container, and to facilitate the expansion and contraction of the seal. .

In order to achieve the above object, the follow plate according to the present invention is attached to the lower end of the pump or the lower end of the suction nozzle connected to the pump, and the stored liquid in a container such as a drum can or a pail can is pumped up and discharged. In the follower plate used for the discharger, the upper and lower circular elastic plates provided with a circular opening at the center are overlapped, and the outer peripheral edge is bonded with a constant width over the entire circumference. In addition, an annular rigid plate having a circular opening at the center is sandwiched from the center to the vicinity of the bonding portion of the outer peripheral edge, and the upper and lower elastic plates and the periphery of the center of the rigid plate have a constant width over the entire circumference. By adhering, providing an air supply / exhaust hole in the upper elastic plate and supplying compressed air to the space between the upper and lower elastic plates, The space portion expands and the outer peripheral edge portion is inclined upward to reduce the diameter, and the compressed air in the space portion is discharged from the air supply / exhaust hole so that the space portion and the outer peripheral edge portion return to normal and the diameter increases. As described above, when the upper and lower elastic plates are made of the same material, the upper elastic plate is made thinner than the lower elastic plate, or the flexibility of the upper elastic plate is lower than that of the lower elastic plate. It is characterized by being raised .

  According to the follow plate according to the first aspect of the present invention having the above-described configuration, the compressed air is supplied from the air supply / exhaust hole to the space portion of the follow plate to reduce the diameter, and is supplied from the air supply / exhaust hole to the space portion The diameter is expanded by discharging air. For this reason, it is not necessary to supply compressed air to the follow plate while the stored liquid in the container is pumped up and discharged. Therefore, a seal with the inner wall of the container due to an abnormal air pressure source or a blockage of the compressed air supply path No defects occur and no liquid leaks during discharge. In addition, the follow plate is basically composed of upper and lower elastic plates, which are light in weight due to the simplification of the structure, easy to assemble, easy to clean, and hygienic. Suitable. Furthermore, since the rigid plate is inserted between the upper and lower elastic plates, it is maintained in a flat plate-like structure in appearance, is easy to handle, and exhibits excellent sealing performance.

Further , according to the follow plate described above, by supplying compressed air and expanding the space in the follow plate excluding the outer peripheral portion and the center portion, the upper elastic plate is easier to bend than the lower elastic plate . The outer peripheral edge is inclined upward. On the other hand, by discharging the compressed air supplied to the space inside the follow plate, the upper and lower elastic plates are restored to the original state, and are supported by the internal rigid plate and become horizontal including the outer peripheral edge. By expanding the diameter, the outer peripheral edge portion of the follow plate is brought into close contact with the inner peripheral wall surface of the container in order to be larger than the inner diameter of the container, thereby exhibiting a sealing action.

As described in claim 2 , a metal thin plate or a synthetic resin thin plate is used for the rigid plate, and a vent hole penetrating vertically can be provided.

According to the follow plate of claim 2, wherein the compressed air supplied into the follow plate is spread smoothly in the elastic plate side of the lower through the vent. Moreover, since it is a thin plate and provided with a vent hole, it is lightweight.

According to a third aspect of the present invention, the upper and lower elastic plates and the rigid plate can each be formed of a transparent material.

According to the follow plate of claim 3, since the state of the stored liquid inside the container and the state of air bleeding can be directly confirmed visually through the follow plate, the lift operation of the follow plate is facilitated and the discharge work is performed. Can be carried out reliably.

As described in claim 4 , a compressor is connected to the air supply / exhaust hole via an electromagnetic on-off valve, and a liquid level sensor for detecting liquid landing on the follow plate is provided to detect liquid landing on the follow plate. When opening the electromagnetic on-off valve and automatically discharging the compressed air in the space, while providing a liquid level sensor for detecting the bottom of the follower plate to reach the bottom of the follower plate, Compressed air can be supplied into the space.

  By configuring in this way, the liquid level sensor detects the landing of the follow plate, the electromagnetic on-off valve is opened, the compressed air in the follow plate is discharged, the diameter is expanded, and the follow plate is placed on the inner peripheral wall of the container The outer peripheral edge of the seal adheres and seals. Thus, the pump is driven and the stored liquid in the container is pumped out. Then, the follower plate gradually descends with the pump to finish the operation of discharging the stored liquid in the container.When the bottom surface is reached, the liquid level sensor detects this state and drives the compressor and closes the electromagnetic on-off valve. Since the compressed air is supplied into the follow plate, the diameter of the follow plate is reduced, the sealing action by the outer peripheral edge that is in close contact with the inner peripheral wall of the container is eliminated, and the pressure in the container is released. Therefore, the follow plate can be raised without difficulty and can be smoothly extracted from the container.

According to a fifth aspect of the present invention, a periphery of the circular opening is formed of a circular U-shaped cross-section that can sandwich the elastic plate and the rigid plate together, and a plurality of the circular openings are formed on the circular ring. The clamp lever for fixing the pump can be rotatably mounted by a support shaft that is spaced from the center of the circular clamp body and is eccentric from the center position of the circular clamp body.

  By comprising in this way, a weight part becomes only the torus near a center part, and weight reduction is attained compared with the conventional follow plate (weight of about 1/3 of the past), and the light weight. With this, the clamp lever can be easily attached to and detached from the pump.

  Since the follow plate of the present invention has the above-described configuration, the following excellent effects can be obtained. That is, since it consists of a simple plate-like structure in which a rigid plate (usually a thin plate) is inserted between the upper and lower elastic plates, it is lightweight, difficult to deform, and easy to handle. In addition, the follower plate can be easily assembled to a pump or the like, and it is easy to clean, smooth on the front and back, hardly contaminated with dirt, and is hygienic, so it is particularly suitable for discharging food materials. In addition, compressed air is supplied into the follow plate when inserted into the container, and it sits on the stored liquid in the container in a floating ring state, so that even when the stored liquid is a low-viscosity liquid such as water, it floats on the liquid surface. Since it does not sink, it is easy to lower the follow plate. Furthermore, after sitting on the stored liquid in the container, the compressed air in the follow plate is simply discharged to expand the diameter and exert a sealing property, so that abnormalities in the compressed air source and the compressed air supply path are blocked. Does not cause a seal failure or leakage. In addition, the expansion and contraction operation of the follow plate can be performed by supplying or exhausting the compressed air into the follow plate, and it is necessary to purge the compressed air into the container under the follow plate or to release the air from the container as in the past. As a result, the stored liquid can be discharged easily and efficiently.

  The best mode for carrying out the follow plate according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view taken along the line AA of FIG. 2 showing an embodiment of the follow plate. The upper part shows a state of insertion into the container (a state where the seal has a reduced diameter), and the lower part discharges the stored liquid in the container. (The state where the diameter of the seal is expanded). FIG. 2A is a plan view showing the follow plate of FIG. 1, and FIG. 2B is a central cross-sectional view showing an enlarged state of the follow plate.

  As shown in FIGS. 1 and 2, the follow plate 1 has a circular shape in plan view, and a circular opening 2 for connecting the suction port 11a of the pump 11 is provided at the center. The circumference of the circular opening 2 is formed by a metal ring 3 having a cross-sectional “U” shape and a constant radius. Four clamp levers 4 for fixing the pump body are arranged at equal intervals in the circumferential direction on the annular body 3, and each clamp lever 4 is a support shaft whose circular clamp body 4a is eccentric from its center position. It is rotatably attached by 4b.

  The follow plate 1 includes an upper elastic plate 5, a lower elastic plate 6, and a metal thin plate 7. The follow plate 1 has an annular shape with circular openings 5b, 6b, and 7b at the center. The lower elastic plate 6 is thicker than the upper elastic plate 5, and the rigid plate 7 is provided with a plurality of large-diameter (for example, 60 mm diameter) vent holes 7a at equal intervals in the circumferential direction. Also plays. The upper and lower elastic plates 5 and 6 have the same shape, and the outer peripheral edge portions 5a and 6a are bonded over the entire circumference over a certain width (in the radial direction) in a superposed state. A rigid plate 7 is interposed between the upper and lower elastic plates 5 and 6 so that the positions of the inner peripheral ends coincide with each other. ing. In this state, the outer peripheral end of the rigid plate 7 extends to the inside of the outer peripheral edge portions 5a and 6a of the upper and lower elastic plates 5 and 6. The upper elastic plate 5 is provided with an air supply / exhaust hole 8 as shown in FIG. 2, and is connected to the air supply / exhaust hole 8 via an electromagnetic opening / closing valve 9 by a compressor 47 and an air tube 25 described later.

  In this example, a uniaxial eccentric screw pump is used as the pump 11, a disc-shaped flange 12 is integrally fitted around the suction port 11 a at the lower end of the pump 11, and the follow plate 1 is attached via the ring-shaped packing 13. It is attached. FIG. 3 shows an example of a method for attaching the follow plate 1. The follow plate 1 is expanded by supplying compressed air to the space S between the upper and lower elastic plates 5, 6 and expanding the follow plate 1. -6a) is seated on the stored liquid T in the container P in a state where the diameter is reduced by tilting upward. In this state, the electromagnetic on-off valve 9 is opened, the compressed air in the space S is discharged from the air supply / exhaust hole 8, the follow plate 1 is expanded, and the outer peripheral edge 1a is brought into close contact with the inner wall surface of the container P. Then, the flange 12 of the pump 11 is fitted into the circular opening 2, and the clamp lever 4 is rotated and fastened and fixed.

  Next, an embodiment of the discharger 10 provided with the follow plate 1 will be described with reference to the drawings.

   FIG. 4 is a left side view showing an embodiment of the discharger, showing a state before pumping up the stored liquid in the container, and FIG. 5 is a front view showing the uniaxial eccentric screw pump in FIG. Indicates the state that the pumping is finished. FIG. 6 is a plan view showing the discharger of FIG.

  In these drawings, the discharger 10 includes a vertical uniaxial eccentric screw pump 11. The pump 11 is integrally coupled to the lower end of the pump casing 14. As shown in FIG. 7, the pump 11 includes a male threaded rotor 16 having a circular cross section and a female threaded stator 15 having an inner hole surface having an elliptical cross section having a pitch twice that of the rotor 16, and the rotor 16 is a stator. 15 is rotatably inserted. The rotor 16 is connected to a rotating shaft 17 a extending downward from a speed reducer 17 integrally connected to the upper end of the pump casing 14 via a connecting rod 18. The rotation center axis M of the rotor 16 is eccentric with respect to the rotation center axis N of the rotation shaft 17a. For this reason, the universal joint 19 is interposed between the rotating shaft 17a and the connecting rod 18 and between the connecting rod 18 and the rotor 16, respectively, so that the eccentric rotation of the rotor 16 can be allowed.

  A small compressor 47 is connected to the air supply / exhaust hole 8 of the follow plate 1 by an air tube 25 in order to supply compressed air. As shown in FIG. 4, the air tube 25 has one end of an electromagnetic opening / closing valve 9 connected to the air supply / exhaust hole 8 and the other exhaust port is open to the atmosphere. Further, the pump casing 14 has a structure in which an upper casing 14a and a lower casing 14b are connected as shown in FIG. 7, and an upward discharge nozzle pipe 14c in a “J” shape is provided at a substantially middle portion of the lower casing 14b in the vertical direction. It is connected continuously. One end of a transfer hose 27 is connected to the discharge nozzle pipe 14 c, and the other end of the hose 27 is detachably held by a receiving metal fitting 56 of the column 31.

  The uniaxial eccentric screw pump 11 is supported so as to be movable up and down along a column 31 erected on a pedestal 33 via an inverted (U) -shaped arm (pump mount) 32 as viewed from the side. That is, the upper end of the speed reducer 17 of the pump 11 is connected to one lower end of the arm 32. As shown in FIG. 8, the support column 31 has a hollow structure and the front surface is open over almost the entire length, and a slide rail 34 is arranged in the vertical direction at the center of the support column 31. A slide guide 35 is mounted so as to be movable up and down along the slide rail 34. A pair of plate-like support members 36 and 36 are vertically fixed to the slide guide 35 with a vertical interval therebetween. A fixed plate 37 is fixed in the vertical direction across the support members 36 and 36, and the lower surface of the lower end of the rear arm 32 is fixed to the fixed plate 37.

  Sprockets 38 and 39 are rotatably supported in the column 31 above and below the slide rail 34, respectively. A chain 40 is stretched over the upper and lower sprockets 38 and 39, and both ends of the chain 40 are connected to the upper and lower ends of the shaft 41. Further, as shown in FIG. 9, an opening 36a penetrating the central portion of the support member 36 is provided, and the shaft 41 is arranged so as to freely move up and down through the upper and lower openings 36a and 36a. In this example, as shown in FIG. 9, the coil spring 42 is contracted around the lower portion of the shaft 41 between the lower support member 36 and the double nut 49 at the lower end screwing portion of the shaft 41. In other words, the pump 11 is supported by the slide guide 35 together with the arm 32, is movable up and down relatively with respect to the shaft 41, is elastically supported by the coil spring 42, and is biased upward. The spring force of the coil spring 42 is increased by tightening the double nut 49.

  A sensor operation unit 43 called a tog is mounted near the upper periphery of the shaft 41, and an upper detection sensor 44 and a lower detection sensor 45 are attached to the slide guide 35 with a slight gap between the upper and lower positions of the tog 43. Also, an elevator motor 46 with a brake is attached to the upper end portion of the column 31, and the drive shaft of the elevator motor 46 is directly connected to the rotation shaft of the sprocket 38 to rotate the sprocket 38. Further, a limit switch 50 for detecting that the follow plate 1 has reached the lowermost position (bottom surface) of the container P is attached below the slide rail 34, and the limit switch 50 is brought into contact with the slide guide 35. 50 turns on. As a result, the electromagnetic on-off valve 9 is closed and the compressor 47 is driven to supply compressed air into the follow plate 1 from the air supply / exhaust hole 8.

  A variable speed electric motor 51 for driving the pump is attached near the lower back of the column 31. The pump motor 51 is connected by a flexible wire 52 to a driven shaft 17b that protrudes upward from the speed reducer 17 with a drive shaft facing upward. The flexible wire 52 is bent forward and downward through a plurality of guides 53 attached to the back surface of the support column 31, and transmits the rotational force of the motor 51 to the driven shaft 17b. Further, as described above, the compressor 47 is attached to the column 31 immediately below the electric motor 51. This compressor 47 is used for supplying compressed air into the follow plate 1 in this example.

  Further, in this example, when the lower detection sensor 45 detects the tog 43 and it is detected that the follow plate 1 is seated on the stored liquid T in the container P, the electromagnetic opening / closing valve 9 is automatically opened, The air supply / exhaust hole 8 is caused to function as an exhaust hole. That is, the lower detection sensor 45 functions as a liquid level sensor for detecting that the follow plate 1 is seated on the upper surface of the stored liquid T in the container P, but normally, as a sensor for starting up the lifting motor 46. Function. That is, the lower detection sensor 45 detects that the follow plate 1 is seated on the stored liquid T in the container P, and the rotation of the elevating motor 46 is stopped. At the same time, the pump motor 51 starts rotating, the rotor 16 rotates, the pump 11 is driven, and the stored liquid T is pumped up. The stored liquid T is discharged from the transfer hose 27 to another container or another place. Then, as the stored liquid T in the container P is pumped up, the liquid level is lowered, the pump 11 is lowered together with the arm 32, and when the upper detection sensor 44 detects the togg 43, the rotation of the lifting motor 46 stops. . In this way, the upper and lower detection sensors 44 and 45 detect the expansion and contraction of the coil spring 42 and repeat the start and stop of the lifting and lowering motor 46, thereby achieving a balance with the urging force within a certain range by the coil spring 42. However, the follower plate 1 reaches the bottom surface in the container P while the pump 11 continues the suction operation of the stored liquid T. This state is detected by the limit switch 50 attached to the lower part of the column 31. After the operation of the pump 11 continues for a while, the rotation of the pump motor 51 stops, and at the same time, the elevating motor 46 reversely rotates and follows. Plate 1 rises.

  After reaching the bottom surface in the container P and detected by the limit switch 50, the follow plate 1 is supplied with compressed air and the outer peripheral portion is inclined upward, so that a gap is formed between the inner peripheral wall of the container P. Since the pressure between the bottom surface of the container P and the follower plate 1 is released from there, excessive force acts on the follower plate 1 and its periphery when the follower plate 1 is lifted together with the pump 11 after the storage liquid T is discharged. The container P is not lifted up.

  Next, in particular, the operation of the follow plate 1 in the discharger 10 of this example having the above-described configuration will be described in detail.

1. Normally, the follow plate 1 is inserted into the container P in a state of being attached to the lower end of the pump 11, but before that, compressed air passes through the air tube 25 from the compressor 47 into the space S through the air supply / exhaust hole 8. Supplied. Therefore, as shown in the upper part of FIG. 1, the inside of the follow plate 1 expands, and the outer peripheral edge 5 a on the thin upper elastic plate 5 side is softer than the outer peripheral edge 6 a of the lower elastic plate 6 and bends. The outer peripheral edge portions 5a and 6a are inclined upward and reduced in diameter. As a result, the outer diameter of the follow plate 1 becomes smaller than the inner diameter of the container P, and it is inserted into the container P without difficulty.

  2. When the follower plate 1 is lowered together with the arm 32 by the rotation of the electric motor 46 and is seated on the upper surface of the stored liquid T in the container P, the slide guide 35 is slightly raised with respect to the shaft 41 by the upward biasing force of the coil spring 42. It moves, and the lower detection sensor 45 detects the tog 43. As a result, the supply of compressed air from the compressor 47 to the follow plate 1 is cut off and the electromagnetic opening / closing valve 9 is opened at the same time, so that the compressed air in the follow plate 1 is discharged from the air supply / exhaust hole 8. As a result, as shown in the lower part of FIG. 1, the upper and lower elastic plates 5 and 6 are restored to the original state, the outer peripheral edge 1a (5a and 6a) becomes horizontal, and the follow plate 1 expands in diameter. For this reason, the outer diameter of the follow plate 1 becomes larger than the inner diameter of the container P, and the outer peripheral edge portion 1a is in close contact with the inner peripheral wall of the container P to be sealed.

  3. When the lower detection sensor 45 detects the tog 43, the pump motor 51 is activated and the pump 11 is operated, whereby the stored liquid T in the container P is pumped out, and the follow plate 1 is lowered on the stored liquid T surface. Descent with it. When the follower plate 1 is lowered with the pump body 3 along with the arm 22 and the upper detection sensor 44 detects the tog 43, the lifting motor 46 starts to rotate.

  4). The vertical movement of the coil spring 42 is detected by the upper and lower detection sensors 44 and 45 through the togg 43, and the lifting and lowering motor 46 is repeatedly started and stopped. The weight balance is achieved by the urging force, and the pumping operation of the stored liquid T by the pump 11 is continued under this state, whereby the follow plate 1 reaches the bottom surface in the container P and the discharging operation is completed.

  5. The fact that the follow plate 1 has reached the bottom surface in the container P is detected by the slide guide 35 coming into contact with the limit switch 50. As a result, the electromagnetic open / close valve 9 is closed and the compressor 47 is driven, so that compressed air is supplied from the air supply / exhaust hole 9 into the space S of the follow plate 1, so that the outer peripheral edge 1 a (5 a, 6 a). ) Is inclined upward and the diameter is reduced, a gap is formed between the inner peripheral wall of the container P, and the pressure between the bottom surface of the container P and the follow plate 1 is released therefrom. Therefore, when the follower plate 1 is raised together with the pump 11 after the stored liquid T is discharged, an excessive force does not act on the follower plate 1 and its periphery, and the container P does not lift up. When it is detected by the limit switch 50 that the follow plate 1 has reached the lower limit position, the pump 11 continues to operate for a while and the motor 51 stops rotating. The plate 1 is raised to the upper limit standby position.

  Although the Example regarding the follow plate of this invention was shown above, it can implement as follows.

  According to the shape of the container P, the follow plate 1 can be changed from a circle to an ellipse or a rectangle.

  ・ Although not shown, the upper and lower elastic plates 5 and 6 of the follow plate 1 are made of transparent silicon rubber, and the rigid plate 7 is made of a transparent plastic plate. The inside of the container P can be seen through.

  In the above embodiment, the follower plate 1 is seated on the stored liquid by the lower detection sensor 45, but a seating-dedicated detection sensor can be provided, and this detection sensor is built in the follower plate 1 and the support column 31. You can also

  In the above embodiment, the structure in which the follow plate 1 is detachably attached to the lower end of the vertical uniaxial eccentric screw pump 11 has been described. However, the type of the pump is not limited, and a rotary pump or a plunger pump may be used. It is also possible to attach the follow plate 1 around the lower end portion of the suction nozzle which is installed at a location away from the follow plate 1 and one end of which is connected to the pump.

  When the stored liquid T in the container P is irritating to the human body (for example, liquid containing wasabi or organic solvent), only the follow plate 1 can be separated from the pump 11 and used as a sealing lid. At this time, an open / close valve 9 is provided in the air supply / exhaust hole 8, and the compressed air in the follow plate 1 can be discharged and sealed. However, it is necessary to provide means for closing the circular opening 2 (see FIG. 2B).

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 2 showing an embodiment of the follow plate of the present invention. (The state where the diameter of the seal is expanded). FIG. 2A is a plan view showing the follow plate of FIG. 1, and FIG. 2B is a central cross-sectional view showing an enlarged state of the follow plate. FIG. 3A is a central cross-sectional view showing the follow plate of FIG. 1 before being attached to the pump, and FIG. 3B is a central cross-sectional view showing an expanded state of the follow plate. It is a left view which shows the discharger provided with the follow plate which concerns on the Example of this invention, The state before pumping up the stored liquid in a container is represented. FIG. 5 is a front view showing the discharger of FIG. 4, showing a state in which a transfer hose is attached and the stored liquid in the container is pumped up. It is a top view which shows the discharger of FIG. It is sectional drawing which expands and shows the part of the pump 11 in the discharger of FIG. FIG. 8A is a left side view of the support 31 cut out, and FIG. 8B is a front view thereof. FIG. 9A is an enlarged left side view showing the periphery of the slide guide 34, and FIG. 9B is a front view thereof. It is a center sectional view showing the conventional general follow plate. It is a center sectional view showing the conventional general follow plate concerning other structures.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Follow plate 1a outer peripheral part 2 Circular opening 3 Metal ring 4 Clamp lever 5 Upper elastic plate 6 Lower elastic plate 5a, 6a outer peripheral part 7 Rigid plate (metal thin plate)
7a Vent 8 Air supply / exhaust hole 9 Electromagnetic open / close valve (valve)
DESCRIPTION OF SYMBOLS 10 Discharger 11 Vertical uniaxial eccentric screw pump 14 Pump casing 15 Stator 16 Rotor 17 Reduction gear 25 Air tube 27 Transfer hose 31 Post 32 Arm (pump mount)
34 Slide Rail 35 Slide Guide 41 Shaft 42 Coil Spring 43 Sensor Operation Unit (Tog)
44 Upper detection sensor 45 Lower detection sensor 46 Elevating motor 50 with brake Limit switch 51 Electric motor for pump

Claims (5)

In the follower plate used for the discharger that is attached to the lower end of the pump or the suction nozzle connected to the pump and pumps up the stored liquid in a container such as a drum can or a pail can with a pump.
Two upper and lower circular elastic plates provided with a circular opening at the center are overlapped, and the outer peripheral edge is bonded with a constant width over the entire circumference.
An annular rigid plate having a circular opening at the center is sandwiched between the upper and lower elastic plates from the center to the vicinity of the bonding portion of the outer peripheral edge, and the upper and lower elastic plates and the periphery of the center of the rigid plate are sandwiched between them. Glue with a constant width all around,
By providing air supply / exhaust holes in the upper elastic plate and supplying compressed air to the space between the upper and lower elastic plates, the space expands and the outer peripheral edge tilts upward and shrinks in diameter, When the material of the upper and lower elastic plates is the same so that the space portion and the outer peripheral edge portion return to normal and expand in diameter by discharging compressed air in the space portion from the air supply / exhaust hole , the upper elastic plate The follow plate is characterized in that the thickness of the follower plate is made thinner than that of the lower elastic plate, or the flexibility of the upper elastic plate is made higher than that of the lower elastic plate.   The follow plate according to claim 1, wherein a metal thin plate or a synthetic resin thin plate is used as the rigid plate, and a vent hole penetrating vertically is provided.   The follow plate according to claim 1, wherein the upper and lower elastic plates and the rigid plate are each formed of a transparent material.   A compressor is connected to the air supply / exhaust hole via an electromagnetic open / close valve, and a liquid level sensor is provided to detect liquid landing on the follow plate to open the electromagnetic open / close valve when detecting liquid landing on the follow plate. Then, the compressed air in the space is automatically discharged, while a liquid level sensor for detecting the bottom of the follow plate reaching the bottom of the container is provided to supply the compressed air into the space when the bottom of the follow plate is reached. The follow plate according to any one of claims 1 to 3.   A circumference of the circular opening is formed by a ring-shaped ring-shaped section that can sandwich the elastic plate and the rigid plate integrally, and a plurality of pump fixing clamp levers are circumferentially arranged on the ring body. The follow plate according to any one of claims 1 to 4, wherein the follow plate is attached to be rotatable by a support shaft that is spaced from the center position of the circular clamp body.

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