JPH0651196U - Piston type quantitative filling machine - Google Patents

Abstract

(57) [Summary] [Purpose] To expand the variable range of the filling capacity of the piston type quantitative filling machine. [Structure] When the piston 8 moves backward, a predetermined amount of the filling liquid is sucked into the cylinder 2 from the filling liquid tank, and when the piston moves forward, the liquid in the cylinder is filled in the container. The piston is composed of a large-diameter piston member 10 that slides on the inner surface of the cylinder, and a small-diameter piston member 12 that is slidably fitted in the large-diameter piston member. In the large-diameter piston member, a closed space 14 having a larger diameter than the sliding surface with the small-diameter piston member is formed, and the outer surface of the small-diameter piston member slides on the inner surface of the space of the large-diameter piston member. The enlarged diameter portion 12a is provided to divide this space into two chambers 14a and 14b, one above the other, and an air supply means 28 for supplying and discharging the air pressure to these upper and lower chambers. Also,
The cylinder is provided with a stopper 2a that limits the downward movement of the large-diameter piston member.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a filling machine, and more particularly to a piston type fixed quantity filling machine that sucks a fixed amount of filling liquid into a cylinder and then extrudes the liquid by a piston to fill the container.

[0002]

[Prior art]

 An example of a conventional piston type quantitative filling machine will be described with reference to FIG. The cylinder 104 and the filling nozzle 106 are fixed to the lower surface of the filling liquid tank 100 via a flow path switching valve 102. The flow path switching valve 102 is provided with a liquid supply passage 102a connecting the filling liquid tank 100 and the cylinder 104, and a filling passage 102b connecting the cylinder 104 and the filling nozzle 106. The cylinder 104 also includes a piston 110 that is connected to a connecting rod 108 and moves up and down. In this piston type quantitative filling machine, the bottle base 114 on which the container 112 is mounted rises, and at the same time, the connecting rod 108 descends to pull down the piston 110, and the liquid supply passage 102a connected by the rotation of the flow path switching valve 102. The liquid in the filling liquid tank 100 is sucked into the cylinder 104. When the liquid supply to the cylinder 104 is completed, the flow path switching valve 102 rotates to close the liquid supply passage 102a, and at the same time, the filling passage 102b opens to connect the inside of the cylinder 104 to the filling nozzle 106. After that, the piston 110 is lifted to perform the filling. When the filling is completed, the bottle base 114 descends and the container 112 is discharged to the outside of the machine.

The amount of the filling liquid filled in the container 112 by such a piston type quantitative filling machine is determined by the product of the sectional area of the cylinder 104 and the working stroke of the piston 110. Therefore, when the same piston type quantitative filling machine is also used for various containers 112, the filling amount is changed by adjusting the operation stroke of the piston 110.

[0004]

[Problems to be solved by the device]

 However, with the method of changing the filling amount by adjusting the operating stroke, when filling a small volume with a cylinder with a large inner diameter, even if there is a slight error in the operating stroke, the error in the filling amount is small. Since it becomes large, it is difficult to change the capacity in the high range, and generally, the capacity can be shared only in the range of about 1: 3 to 1: 5. Therefore, it was necessary to replace the cylinder and piston in order to use them as containers with different capacities. When replacing the cylinder and the piston in this way, there is a problem that the switching work requires a great deal of time and the cost becomes high. Therefore, the present applicant has already proposed a capacity changing mechanism of the quantitative filling machine capable of changing the capacity in a wide range (Jpn. Pat. Appln. KOKAI 4-39199). However, this capacity changing mechanism manually switches, and there is a problem in the time and labor of the switching work.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and is a piston type that can be used in a wide volume range automatically without any replacement of parts such as a cylinder and a piston and by a simple operation. A quantitative filling machine is provided.

[0006]

[Means for Solving the Problems]

 The piston type quantitative filling machine according to the present invention includes a cylinder and a piston that reciprocates in the cylinder. When the piston retracts, a predetermined amount of filling liquid is sucked from the filling liquid tank into the cylinder, The liquid in the cylinder is filled into the container by the forward movement of the piston, and the piston is slidably fitted in the large-diameter piston member that slides on the inner surface of the cylinder. And a small-diameter piston member that has a small diameter.The inside of this large-diameter piston member forms a closed space whose diameter is larger than the sliding surface of the small-diameter piston member. An enlarged diameter portion that slides on the inner surface of the space of the large-diameter piston member is provided to divide this space into two chambers, an upper chamber and an upper chamber. Up It is intended a stopper for stopping the downward movement of the large-diameter piston member digits set in the cylinder.

[0007]

[Action]

 In the above piston type quantitative filling machine, when filling a large volume, air is introduced into the chamber above the expanded diameter part to raise the large diameter piston member, and the bottom of the space is set to the bottom surface of the expanded diameter part. When a small volume is to be filled by bringing the large and small piston members into action as a single body by abutting against, the air is introduced into the chamber below the enlarged diameter section so that the large piston member It is lowered and stopped by a stopper formed in the cylinder, and this large-diameter piston member is integrated with the cylinder so that only the small-diameter piston member acts as a piston.

[0008]

【Example】

 The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 is a vertical sectional view of a cylinder portion of a piston type quantitative filling machine according to an embodiment of the present invention. The configuration other than the cylinder portion may be the same as that of the conventional piston type quantitative filling machine (see FIG. 3) or may be other configurations, and therefore, illustration and description thereof are omitted. The cylinder 2 is fixed to the lower surface of a filling liquid tank (not shown) via a flow path switching valve, and is also connected to a filling nozzle via the same flow path switching valve.

Inside the cylinder 2, a piston ring 4 is fitted on the outer periphery, and a piston 8 kept liquid-tight by an O-ring 6 is slidably fitted. The piston 8 has a large-diameter piston member 10 that directly slides on the inner surface of the cylinder 2 and a small-diameter piston member 10 that is slidable by being inserted into a through hole 10a formed in the shaft core of the large-diameter piston member 10. The piston member 12 of FIG. The lower part of the small-diameter piston member 12 is connected to a driving means (not shown) so as to be moved up and down.

An inward flange (stopper) 2 a is formed at the lower end of the cylinder 2. On the other hand, in the lower part of the large-diameter piston member 10, a small-diameter portion 10b is provided by cutting out the outer peripheral surface, and a step portion between the large-diameter outer surface 10c and the small-diameter portion 10b of the large-diameter piston member 10 is provided. 10d hits the collar portion 2a of the cylinder 2 to regulate the lower limit of the descending movement of the large-diameter piston member 10. Inside the large-diameter piston member 10, a space 14 is formed by enlarging the periphery of the through hole 10a. The O-rings 16 and 18 and the seal member 20 are mounted between the inner peripheral surface of the through hole 10a of the large-diameter piston member 10 and the outer peripheral surface of the small-diameter piston member 12, which are located above and below this space 14. The airtightness of the space 14 and the outside of the cylinder 2 and the cylinder chamber 21 is maintained. An enlarged diameter portion 12a having an outer diameter substantially equal to the inner diameter of the space 14 in the large diameter piston member 10 is formed on the outer surface of the small diameter piston member 12. In the present embodiment, the enlarged diameter portion 12a has a thickness which is a fraction of the axial length of the space 14 (the length of the space 14 and the thickness of the enlarged diameter portion 12a are set appropriately. Of the position where the lower surface 12b of the expanded diameter portion 12a and the lower surface 10e of the space 14 contact, and the position where the upper surface 12c of the expanded diameter portion 12a and the upper surface 10f of the space 14 contact. In the meantime, the large-diameter piston member 10 can move up and down relatively to the small-diameter piston member 12. An O-ring 22 is fitted on the outer peripheral surface of the enlarged diameter portion 12a, and divides the space 14 into two chambers 14a and 14b (see FIG. 2) above and below the enlarged diameter portion 12a. ing. Note that FIG. 1 shows a state in which the chamber 14b on the lower side of the enlarged diameter portion 12a is completely closed.

The large-diameter piston member 10 includes a passage 10g for communicating the inside of the chamber 14a on the upper side of the space 14 (that is, the upper side of the enlarged diameter portion 12a) with the outside of the piston 8, and the lower side of the space 14 (ie, A passage 10h that connects the inside of the chamber 14b on the lower side of the enlarged diameter portion 12a) to the outside of the piston 8 is formed. Both of these passages 10g and 10h are connected to an air supply source 28 via first and second directional control valves 24 and 26, respectively, and introduce compressed air into these chambers 14a and 14b. Or open to the atmosphere.

The operation of the piston type quantitative filling machine according to the above configuration will be described. When a large capacity is to be filled (see FIG. 1), the second directional control valve 26 is switched to introduce compressed air into the chamber 14a above the space 14 and the first directional control valve 24 Thus, the inside of the chamber 14b below the space 14 is opened to the atmosphere. Then, since the small-diameter piston member 12 is connected to and constrained by the above-mentioned driving means (not shown), the large-diameter piston member 10 moves up relative to the small-diameter piston member 12, and the large-diameter piston member The lower surface 10e of the space 14 of the tongue member 10 is pressed against the lower surface 12b of the enlarged diameter portion 12a of the small diameter piston member 12 and stops. In this way, the large-diameter piston member 10 and the small-diameter piston member 12 are integrated to form the piston 8. In this state, the small-diameter piston member 12 is moved up and down by the driving means. By moving the small-diameter piston member 12 up and down, the entire piston 8 reciprocates between the position shown by the solid line and the position shown by the broken line in FIG. 1, thereby sucking the filling liquid from the filling liquid tank and via the filling nozzle. Fill the container with the liquid. In this case, it is possible to fill the capacity corresponding to the product of the sectional area of the cylinder 2 (the sectional area of the entire piston 8) and the stroke amount of the entire piston 8.

Further, in the case of filling a small volume (see FIG. 2), the bidirectional switching valves 24 and 26 are respectively switched to open the upper chamber 14a of the space 14 to the atmosphere and to compress the compressed air in the lower chamber 14b. To introduce. Since the small diameter piston member 12 is constrained by the driving means, the large diameter piston member 10 is relatively lowered. Since the small-diameter portion 10b is formed at the lower portion of the large-diameter piston member 10 and the flange portion 2a is provided at the lower end of the cylinder 2, the step portion 10d of the large-diameter piston member 10 is provided on the upper surface of the flange portion 2a. Stop and hit. As a result, the large-diameter piston member 10 is integrated with the cylinder 2 to form a part of the cylinder 2, and when the small-diameter piston member 12 is moved up and down by the driving means, the small-diameter piston member 12 is imagined in FIG. By moving up and down between the position shown by the line and the position shown by the solid line, it is possible to fill the capacity by the product of the sectional area and the stroke amount of the small diameter piston member 12.

As described above, the piston 8 is divided into the large-diameter piston member 10 and the small-diameter piston member 12, and the two members 10 and 12 are integrated to perform the piston action. By switching the case where the piston member 10 is integrated with the cylinder 2 side and only the small diameter piston member 12 acts as a piston, a wide range can be achieved without replacing parts such as the cylinder and the piston. The volume can be changed and it can be used for a wide variety of different size containers. By appropriately selecting the difference in diameter between the large-diameter piston member 10 and the small-diameter piston member 12, and the axial length of the space 14 and the thickness of the enlarged diameter portion 12a, etc. Can be set to.

[0015]

[Effect of device]

 As described above, according to the present invention, the piston of the piston type quantitative filling machine is slidably fitted in the large-diameter piston member that slides on the inner surface of the cylinder. And a small diameter piston member, and a closed space having a diameter larger than the sliding surface with the small diameter piston member is formed in the large diameter piston member, and the large diameter piston member is formed on the outer surface of the small diameter piston member. Large and small by providing an enlarged diameter part that slides on the inner surface of the space of the diameter piston member, dividing this space into two chambers, upper and lower, and providing air supply means for supplying and discharging air pressure to these upper and lower chambers. It is also possible to fill a large volume when the piston member of the above is integrated, and it is also possible to fill a small volume by integrating the large diameter piston member with the cylinder and advancing and retracting only the small diameter piston member. In a wide range It is possible to change the filling capacity.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a cylinder and a piston of a piston type quantitative filling machine according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an operating state of the cylinder and piston different from the state shown in FIG.

FIG. 3 is a simplified vertical sectional view showing a general piston type quantitative filling machine.

[Explanation of symbols]

 2 Cylinder 2a Stopper (Flange of Cylinder) 8 Piston 10 Large Diameter Piston Member 12 Small Diameter Piston Member 12a Enlarged Diameter Part of Small Diameter Piston Member 14 Space in Large Diameter Piston Member 28 Air Supply Means

Claims (3)

[Scope of utility model registration request] 1. A cylinder and a piston that reciprocates in the cylinder, wherein a predetermined amount of the filling liquid is sucked into the cylinder from the filling liquid tank by retreating the piston, and the liquid in the cylinder is moved by advancing the piston. In a piston type quantitative filling machine for filling the inside of a container with a piston, the piston has a large-diameter piston member that slides on the inner surface of a cylinder, and a small-diameter piston member slidably fitted in the large-diameter piston member. And a closed space having a larger diameter than the sliding surface with the small diameter piston member is formed in the large diameter piston member, and the inner surface of the space of the large diameter piston member is formed on the outer surface of the small diameter piston member. Is provided with an enlarged diameter portion to divide the space into upper and lower chambers, and air supply means for supplying and discharging air pressure is provided in the upper and lower chambers, and the large diameter piston is attached to the cylinder. A piston type quantitative filling machine, which is provided with a stopper for stopping the descent of the rotary member. 2. When the large-diameter piston member is raised by introducing air into the chamber above the enlarged diameter portion, the bottom surface of the space of the large-diameter piston member contacts the lower surface of the enlarged diameter portion. The piston type fixed amount filling machine according to claim 1, wherein the large diameter piston member and the small diameter piston member are integrally connected to each other. 3. When the large-diameter piston member is lowered by introducing air into the chamber below the enlarged diameter portion, the lower surface side of the large-diameter piston member contacts a stopper formed on the cylinder. The piston type fixed amount filling machine according to claim 1, wherein the large diameter piston member is connected to the cylinder when stopped.