JP6145008B2 - Pinch valve and liquid filling device provided with the pinch valve - Google Patents

Description

  The present invention relates to a pinch valve provided in a pipe for transferring a highly viscous liquid, and a liquid filling apparatus including the pinch valve.

  Conventionally, when a liquid such as a solution is quantified into a container, for example, as shown in FIG. 6, a pipe 102 is provided from the liquid tank 100 toward the container 101, and an opening / closing valve 103 is provided on the container side of the pipe 102. A filling device is used. In this filling apparatus, a system is constructed in which a predetermined amount of liquid L is transferred by measuring the integrated flow rate of the liquid transferred through the pipe 102 by the pump 104 and the weight of the container 101. Liquids transferred by such a system include high viscosity liquids such as liquid glues and adhesives.

  As a prior art related to this type of liquid filling apparatus, a nozzle cylinder is suspended from the lower end portion of the case main body forming the filling chamber, and a liquid draining member is fitted into the nozzle cylinder from the filling chamber so that the filling liquid in the nozzle cylinder is supplied. There is a liquid filling device that extrudes (see, for example, Patent Document 1).

  As another prior art, when the liquid to be filled has a high viscosity, the opening and closing speed of the filling valve is increased to prevent dripping, and when the liquid to be filled has a low viscosity, the opening and closing speed of the filling valve is decreased. Thus, there is a filling device that prevents liquid splashing (see, for example, Patent Document 2).

JP-A-9-86502 Japanese Patent Laid-Open No. 10-59491

  However, in the case of the filling device described in Patent Documents 1 and 2, the configuration for passing or blocking the liquid is complicated. For example, when transferring a highly viscous liquid such as an adhesive, the valve is not used. There is much liquid remaining on the inner surface of the pipe after closing. Therefore, when the temperature of the liquid transferred at a high temperature is lowered and hardened, disassembly and cleaning are difficult, and labor and time are required for maintenance. In addition, the liquid may stay in a complicated structure and an error may occur in the amount of liquid to be transferred.

  Further, a high amount of high-viscosity liquid remains on the inner wall of the pipe 102 even when the valve 103 is closed. Therefore, as shown in FIG. 6 above, after removing the container 101 containing the fixed amount, the remaining liquid L in the pipe 102 is dripped as a liquid dripping before the next container 101 is arranged, thereby deteriorating the working environment. Let For this reason, the dropped liquid L is cleaned and the next container is disposed. For example, when the liquid is an adhesive, much labor and time are required to clean the dropped liquid. As in the above-mentioned Patent Document 2, even if the valve opening / closing speed is increased, dripping occurs if there is residual liquid.

  Accordingly, an object of the present invention is to provide a pinch valve that forcibly discharges the liquid downstream of the sealing surface and does not allow residual liquid to drip after sealing, and a liquid filling apparatus including the pinch valve.

  In order to achieve the above object, a pinch valve according to the present invention has a main body casing having a cylindrical hollow space at the center, and is disposed in the hollow space and is compressed in the center direction by the gas pressure supplied from the main body casing side. A sealing tube that has a diameter, a valve body that is inserted into the inner space of the sealing tube and has a sealing surface that the sealing tube is reduced in diameter and closely contacts, an upstream closing member that closes the upstream side of the main body casing, A downstream closing member that closes the downstream side of the main body casing, and the valve body has a gas blowout port for blowing gas from the downstream side of the seal surface to the seal tube, and a gas to the gas blowout port And a gas supply passage for supplying the gas.

  With this configuration, the diameter of the seal tube is reduced toward the valve body and sealed with the seal surface, and in this state, the gas is blown out from the gas discharge port provided on the downstream side of the seal surface. Thereby, the liquid adhering downstream from the sealing surface can be forcibly discharged with gas. Therefore, there is no residual liquid after sealing, and the liquid to be transferred can be stopped with an appropriate amount.

  The valve body may be located in a hollow space of the main body casing, and the upstream closing member and the downstream closing member may be configured separately from the main body casing.

  With this configuration, the valve body is positioned so that the sealing surface of the valve body is pressed evenly by reducing the diameter of the seal tube, and the entire circumference of the sealing surface is absorbed by absorbing manufacturing errors and the like of the valve body. Can be used for proper sealing. Moreover, by disposing each part so as to be disassembled, the internal disassembly and cleaning can be performed in a short time even when a liquid having a high viscosity and a possibility of curing due to a temperature drop or the like is transferred.

  The downstream closing member has a gas supply passage that opens toward the valve body, and the gas supply passage of the valve body is configured to communicate with the gas supply passage of the downstream closing member. May be.

  If comprised in this way, while disassembling each component and cleaning an inside for a short time, the gas which blows off from a gas blower outlet can be appropriately supplied to a valve body from a downstream closure member.

  A seal member may be disposed between the valve body and the downstream closing member.

  If comprised in this way, the clearance gap in the contact surface of a valve body and a downstream closure member can be sealed appropriately with a seal member, and it can send appropriately, suppressing the leak of the gas sent to a valve body from a downstream closure member. .

  Further, a plurality of gas supply passages of the valve body may be provided radially from the axial center position of the valve body, and a gas outlet may be disposed around the valve body.

  If comprised in this way, the liquid adhering to the downstream side rather than the sealing surface with the gas blown out from the several gas blowing outlet can be forcedly discharged at a stretch.

  On the other hand, in the liquid filling apparatus of the present invention, the pinch valve is provided at the end portion of the transfer pipe, the gas control is performed by reducing the diameter of the seal tube of the pinch valve toward the valve body, and the sealing is performed. A control device that performs gas control for blowing gas from the gas outlet is provided.

  With this configuration, by providing a pinch valve at the end of the transfer pipe, the pipe downstream from the pinch valve is eliminated, the liquid in the transfer pipe is stopped by the pinch valve, and then the liquid in the valve downstream from the seal surface is gasified. Can be forcibly discharged continuously.

  According to the present invention, the liquid on the downstream side of the sealing surface can be forcibly discharged, so that there is no dripping of the remaining liquid after sealing, and the transferred liquid can be stopped with an appropriate amount.

FIG. 1 is a longitudinal sectional view showing a pinch valve according to an embodiment of the present invention. FIG. 2 is a view taken in the direction of arrow II shown in FIG. 3 is a cross-sectional view taken along the line III-III shown in FIG. FIG. 4 is a block diagram showing a liquid filling apparatus including the pinch valve shown in FIG. FIG. 5 is a cross-sectional view when the pinch valve shown in FIG. 1 is used. (A) is a cross-sectional view when liquid is supplied, (b) is a cross-sectional view when liquid supply is stopped, and (c) is when the residual liquid is discharged. It is sectional drawing. FIG. 6 is a configuration diagram showing a problem in a conventional valve system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, a pinch valve provided at an end portion of a pipe for transferring a highly viscous liquid to a predetermined container will be described as an example. In the following embodiments, air will be described as an example of the gas for closing the valve by the seal tube and discharging the residual liquid. A rubber tube will be described as an example of the seal tube.

  As shown in FIG. 1, the pinch valve 1 of this embodiment refers to the axial direction of the center (in this specification and claims, the liquid transfer direction of the pinch valve 1 (the vertical direction in the figure)). ) Is provided with a main body casing 10 having a cylindrical hollow space 11. In the hollow space 11 of the main casing 10, a rubber tube 15 whose diameter is reduced in the central direction by the gas pressure supplied from the main casing 10 side, and the rubber tube 15 is inserted into the inner space of the rubber tube 15. A valve body 20 that is in close contact with the diameter is provided. A downstream closing member 30 is provided on the downstream side of the main casing 10, and an upstream closing member 40 is provided on the upstream side of the main casing 10.

  In this example, the fixing bolt 2 is inserted into the bolt holes 32, 12, 42 provided in the downstream side closing member 30, the main body casing 10, and the upstream side closing member 40, and the fixing bolt 2 of the upstream side closing member 40 is inserted. The nut 3 is screwed onto the threaded portion, and these are integrally fixed. In this example, it is fixed at four locations (FIGS. 2 and 3).

  The valve body 20 is formed with a recessed sealing surface 21 in a cylindrical central portion, and large diameter portions 22 and 23 are provided on both axial sides thereof. On both sides in the axial direction of the large diameter portions 22 and 23, support portions 24 and 25 having an oval cross section projecting from a cylindrical portion are provided. The support portions 24 and 25 are formed so as to protrude in the axial direction from the centers of the large diameter portions 22 and 23, and as shown in FIG. 41 is partially cut away so as to pass through.

  Further, the valve body 20 has a gas supply passage 26 formed from the axial position toward the large-diameter portion on the downstream side. The gas supply passage 26 is provided at the position of the downstream large diameter portion 22 of the valve body 20 from the axial center position toward the outer periphery. The gas supply passage 26 has a central portion communicating with a gas supply passage 34 described later. By providing the gas supply passage 26 in the large-diameter portion 22 on the downstream side, the exhaust air A2 is blown from the vicinity of the downstream side of the seal surface 21 to the rubber tube 15.

  The main casing 10 is fitted with annular flanges 16 provided at both ends of the rubber tube 15 in a state where the rubber tube 15 is attached to a cylindrical hollow space 11 formed in the axial direction. A recess 13 is provided.

  Further, the upstream closing member 40 and the downstream closing member 30 are provided with projections 41 and 31 for positioning the valve body 20 substantially at the center of the main body casing 10, respectively.

  The rubber tube 15 is disposed in the hollow space 11 of the main body casing 10, and the flange portion 16 of the rubber tube 15 is fitted into the concave portion 13 of the main body casing 10. The main body casing 10, the upstream side closing member 40, and the downstream side closing member 30 are joined in the axial direction in a state where the valve body 20 is put in the rubber tube 15, and the fixing bolt 2 and the nut 3 are integrated. Fixed.

  By fixing in this way, the flange portion 16 of the rubber tube 15 is sandwiched between the main body casing 10, the upstream side closing member 40, and the downstream side closing member 30, and functions as a sealing material in these connecting portions. .

  Further, a sealing material 36 is provided between the downstream end face of the valve body 20 and the downstream closing member 30. For example, a rubber sheet is used as the sealing material 36. The sealing material 36 is provided with a through hole 37 in the central portion. By providing this sealing material 36, the valve body 20 is prevented from moving in the axial direction in the hollow space 11 of the main body casing 10, and the communication state of gas supply passages 34 and 26 described later is stably maintained. . A plurality of gas supply passages 26 of the valve body 20 are provided radially at the position of the large diameter portion 22, and a plurality of gas outlets 27 are disposed around the large diameter portion 22. By disposing a plurality of gas outlets 27 around the large-diameter portion 22, the liquid L adhering to the downstream side of the seal surface 21 can be forcibly discharged at once with gas.

  Furthermore, a terminal portion of the transfer pipe 50 for the liquid L is fixed to the central portion of the upstream closing member 40 with a mounting bracket 51. Further, an air pipe 52 that supplies the closing air A <b> 1 and closes the pinch valve 1 between the hollow space 11 and the outer surface of the rubber tube 15 is connected to the side portion of the main body casing 10. Further, an air supply pipe 53 that supplies exhaust air A2 is connected to the gas supply passage 34 provided in the downstream side closing member 30.

  As shown in FIG. 2, the downstream closing member 30 is provided with a discharge port 33 for discharging the liquid L transferred through the space between the valve body 20 and the rubber tube 15. The two discharge ports 33 are provided so as to open the hollow space 11 of the main casing 10 to the lower surface of the downstream closing member 30 while avoiding the central portion of the downstream closing member 30. The discharge port 33 may have other forms.

  Further, a gas supply passage 34 that opens toward the hollow space 11 of the main casing 10 is provided in the central portion. The gas supply passage 34 is formed so as to extend from the intermediate portion on the side of the downstream side closing member 30 toward the center and to open toward the hollow space 11 of the main body casing 10 at the center portion. An air supply pipe 53 that supplies exhaust air A2 is connected to the gas supply passage 34.

  As shown in FIG. 3, the rubber tube 15 disposed in the hollow space 11 of the main body casing 10 is located in the axially central portion of the main body casing 10, and the valve body 20 is located inside the rubber tube 15. ing. In the figure, since the central portion in the axial direction of the main body casing 10 is cut, the large-diameter portion 22 of the valve body 20 is shown between the recessed seal surface 21 and the rubber tube 15 in the central portion. In the valve body 20 of this embodiment, a plurality of gas supply passages 26 are provided radially at the position of the large diameter portion 22 from the axial center position toward the outer periphery.

  As shown in FIG. 4, when the pinch valve 1 described above is used in the liquid filling device 5, it is attached to the terminal end of the transfer pipe 50. Thereby, the piping part downstream from the position closed by the pinch valve 1 can be shortened. The transfer pipe 50 is provided with a pump 57 that transfers the liquid L from the liquid tank 55 to the container 58. The pump 57 is driven by a motor 56.

  Further, a control device 60 is provided for driving the motor 56, opening and closing the pinch valve 1, and controlling air supply to the gas supply passages 34 and 26 of the pinch valve 1. The control device 60 controls the pinch valve 1 as follows.

  As shown in FIG. 5 (a), the liquid L is transferred by the pump 57 (FIG. 4) with the pinch valve 1 opened. The liquid L in this state passes through the gap between the valve body 20 and the rubber tube 15 from the transfer pipe 50 and is discharged from the discharge port 33 of the downstream side closing member 30, and a predetermined amount is stored in the container 58 as shown in FIG. Be transported. The predetermined amount of the liquid L is detected by the discharge amount of the pump 57 and the weight of the container 58.

  Next, as shown in FIG. 5 (b), after the liquid L is transferred by a predetermined amount, the control device 60 supplies the closing air A 1 from the air pipe 52 to the outer periphery of the rubber tube 15. By the gas control of the control device 60, the rubber tube 15 is pressed and brought into close contact with the concave and curved sealing surface 21 of the valve body 20, and the valve body 20 and the rubber tube 15 are closed.

  As described above, when the rubber tube 15 is pressed against and closely contacts the sealing surface 21 of the valve body 20, the transfer of the liquid L is stopped. Further, the pump 57 (FIG. 4) is also stopped. In this state, the supply of the liquid L is stopped at the seal surface 21, but the liquid L remains in the discharge port 33, the gap, or the like downstream of the seal surface 21.

  Then, as shown in FIG. 5 (c), exhaust air A 2 is supplied from the air supply pipe 53 by the control device 60. By the gas control of the control device 60, the gap between the gas outlet 27 and the rubber tube 15 on the downstream side of the seal surface 21 from the gas supply passage 34 of the downstream closing member 30 through the gas supply passage 26 of the valve body 20. Exhaust air A2 is blown out.

  By this discharge air A2, the liquid L remaining in the discharge port 33 and the like downstream of the seal surface 21 is blown out from the discharge port 33 together with the discharge air A2. In other words, the liquid L remaining on the downstream side of the pinch valve 1 is forcibly discharged by sending the discharge air A2 into the pinch valve 1 and blowing air downstream from the seal surface 21. can do.

  Therefore, after this air blow is performed, the liquid L does not drop from the discharge port 33 of the pinch valve 1, and the accurate measurement of the transfer amount and prevention of dripping after the container 58 is moved are intended. Is possible.

  As described above, according to the pinch valve 1, the pipe portion on the downstream side from the seal surface 21 can be physically reduced, so that the amount of liquid remaining downstream from the seal surface 21 after the transfer of the liquid L is reduced. Can do. Moreover, since the residual liquid is blown out from the discharge port 33 with the air blown out from the gas blowout port 27, it is possible to prevent the residual liquid from dripping after the transfer is stopped. Therefore, the high-viscosity liquid L can be efficiently transferred without deteriorating the working environment.

  And according to the said embodiment, the pinch valve 1 of the simple structure which made main component 5 points of the main body casing 10, the rubber tube 15, the valve body 20, the downstream closing member 30, and the upstream closing member 40. It is said. Therefore, even if the liquid L has a high viscosity like an adhesive and may be cured when the temperature is lowered, it can be easily disassembled and cleaned when cured inside the pinch valve 1. it can.

  In the above embodiment, the example in which the valve body 20, the upstream side closing member 40, and the downstream side closing member 30 are configured separately has been described. For example, the valve body 20 and the downstream side closing member 30 are integrally formed. Each configuration may be formed, and each configuration is not limited to the above embodiment.

  Moreover, the valve body 20 in the said embodiment is an example, You may form with another form, The shape of the valve body 20, etc. are not limited to the said embodiment.

  Furthermore, the above-described embodiment shows an example, and various modifications can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

  The pinch valve according to the present invention can be used as a valve in an apparatus for filling a container with a highly viscous liquid.

1 Pinch valve
DESCRIPTION OF SYMBOLS 5 Liquid filling apparatus 10 Main body casing 11 Hollow space 13 Recessed part 15 Rubber tube (seal tube)
Reference Signs List 16 flange 20 valve body 21 sealing surface 22, 23 large diameter portion 24, 25 support 26 gas supply passage 27 gas outlet 30 downstream closing member 33 discharge port 34 gas supply passage 53 air supply pipe 36 sealing material 37 through hole 40 Upstream side closing member 50 Transfer pipe 52 Air pipe 53 Air supply pipe 60 Control device A1 Closing air A2 Exhaust air
L liquid

Claims (6)

A body casing having a cylindrical hollow space in the center,
A seal tube disposed in the hollow space and having a diameter reduced in a central direction by a gas pressure supplied from the main casing side;
A valve body that is inserted into the internal space of the seal tube and has a seal surface with which the seal tube is reduced in diameter and in close contact;
An upstream closing member for closing the upstream side of the main body casing;
A downstream closing member for closing the downstream side of the main body casing,
The valve body includes a gas blowout port for blowing gas between the seal surface and the seal tube, and a gas supply passage for supplying gas to the gas blowout port. Pinch valve.   The pinch valve according to claim 1, wherein the valve body is located in a hollow space of the main body casing, and the upstream closing member and the downstream closing member are configured separately from the main body casing. The downstream closing member has a gas supply passage that opens toward the valve body,
The pinch valve according to claim 2, wherein the gas supply passage of the valve body is configured to communicate with the gas supply passage of the downstream closing member.   The pinch valve according to claim 3, wherein a seal member is disposed between the valve body and the downstream closing member.   The pinch valve according to any one of claims 1 to 4, wherein a plurality of gas supply passages of the valve body are provided radially from an axial center position of the valve body, and gas outlets are arranged around the valve body. . A liquid filling apparatus comprising the pinch valve according to any one of claims 1 to 5,
Provide the pinch valve at the end of the transfer pipe,
A control device for performing gas control for reducing the diameter of the seal tube of the pinch valve toward the valve body and sealing, and for performing gas control for blowing gas from the gas outlet in the sealed state. Liquid filling device characterized.

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