JPH0439200Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Field of Application" The present invention relates to a quantitative filling device, and more particularly to a safety device that releases pressure when the filling pressure exceeds a predetermined pressure.

"Prior Art" Conventionally, quantitative filling devices generally have a cylinder that communicates with the inside of a filling liquid tank, a piston that reciprocates within this cylinder to supply and discharge the filling liquid into the cylinder, and a piston that communicates with the inside of the cylinder. and a flow path switching valve that alternately switches communication between the filling liquid tank and the cylinder and between the cylinder and the liquid injection pipe.

When filling the container with the filling liquid, first, the flow path switching valve shuts off the communication between the cylinder and the liquid filling pipe, and at the same time establishes communication between the filling liquid tank and the cylinder. The piston is actuated to suck the filling liquid in the filling liquid tank into the cylinder. Next, the flow path switching valve allows communication between the cylinder and the liquid injection pipe and cuts off communication between the filling liquid tank and the cylinder,
In this state, the piston may be actuated to discharge the liquid in the cylinder to fill the container through the liquid injection pipe.

``Problem that the invention aims to solve'' By the way, with conventional quantitative filling equipment, no consideration was given to safety devices in the event that the pressure inside the cylinder rose abnormally during filling operation, and such a situation could occur. If this happens, there is a risk that the cylinder etc. will be damaged by the hydraulic pressure.

In order to solve these drawbacks, it is possible to install a relief valve that releases the filling liquid inside the cylinder to the outside when the pressure inside the cylinder rises above a predetermined value. However, if the relief valve is simply installed, The discharged filling liquid may adhere to the outer periphery of the cylinder, etc., and cause contamination of the quantitative filling device.

In view of such circumstances, the present invention is designed to allow the pressure to be released to the outside when the pressure inside the cylinder rises above a predetermined value, and at the same time, the discharged filling liquid is sent to the recovery tank via the discharge passage. This is to prevent the filling liquid from adhering to the outer periphery of the cylinder.

"Means for Solving the Problems" That is, the present invention provides the above-mentioned quantitative filling device, in which a discharge passage for discharging the filling liquid in the cylinder to the outside is formed in the cylinder or the piston, and the discharge passage is connected to the above-mentioned communicating with a recovery tank separate from the filling liquid tank, and providing a valve seat in the discharge passage, and providing a valve body that is normally seated on the valve seat with a predetermined biasing force to close the discharge passage;
Further, the pressure within the cylinder is applied to the valve body, and when the pressure exceeds the biasing force, the valve body is moved away from the valve seat.

In addition, when installing the valve body, the outer circumferential sliding part of the valve body is slidably fitted in a discharge passage formed in the cylinder or piston while maintaining liquid tightness, and one end of the valve body is seated on the valve seat from the downstream side of the discharge passage, and its other end protrudes outside from the discharge passage, and the discharge passage between the downstream side of the valve seat and the outer peripheral sliding part of the valve body is The liquid passage can be communicated with a liquid passage formed in the valve body, and the liquid passage can be further communicated with a recovery tank via a conduit connected to an externally protruding portion of the valve body.

"Operation" According to the above configuration, if the pressure inside the cylinder increases abnormally due to a switching error of the flow path switching valve during filling operation, the valve body is moved against a predetermined urging force. Since the valve seat can be moved away from the valve seat and the pressure can be released, the cylinder etc. can be prevented from being damaged by the hydraulic pressure.

At this time, the filling liquid is collected from the discharge passage into the recovery tank, so it is possible to prevent the quantitative filling device from being contaminated by the discharged filling liquid, and the recovery tank is separate from the filling liquid tank. Since the filling liquid is not returned to the filling liquid tank again, it is possible to eliminate the risk of the filling liquid in the filling liquid tank being contaminated by the filling liquid flowing through the discharge passage.

In addition, in the case where a liquid passage is formed in the valve body and the liquid passage is communicated with the collection tank via a conduit connected to an external protrusion of the valve body, the valve body may be pulled out. Since the connection between the cylinder and the conduit can be easily separated by simply pulling the cylinder, the workability when disassembling and assembling the quantitative filling device can be improved.

"Example" The present invention will be explained below with reference to the illustrated example.
In FIG. 1, reference numeral 1 denotes a metering type filling device for filling a predetermined amount of filling liquid into a container 2, in which a plurality of units are placed at predetermined intervals on the lower surface of a support portion 3 protruding from the outer periphery of the bottom of a filling liquid tank (not shown). It is set up.

As shown in FIGS. 2 and 3, the quantitative filling device 1 is formed on both sides of a trapezoidal plate 5 which is arranged at a predetermined interval on the lower surface of the support part 3 and temporarily fastened with a tightening bolt 4. The quantitative filling device 1 is attached to the engaging portion 5a.
After engaging the engagement grooves 6a formed on both sides of the body 6, the body 6 is pushed toward the radial center of the filling liquid tank, and the semicircular recess 6b formed at the rear end of the upper surface of the body 6 is pressed. (FIG. 3) contacts the pin 7 fixed to the lower surface of the support part 3, and is fixed to the support part 3 by tightening the tightening bolt 4.

As shown in FIG. 1, a large diameter through hole 6c is formed in the shaft portion of the body 6.
A rod-shaped valve member 11 is rotatably fitted into the valve member c, and a ring-shaped seal member 12 that maintains liquid tightness with the inner periphery of the body 6 is attached to the outer periphery of both ends of the rod-shaped valve member 11, respectively. Two cam levers 13 are fixed to the outer periphery of the tip of the valve member 11 at a predetermined angle facing outward in the radial direction (see Fig. 3), and the cam levers 13 are engaged with cams (not shown). Therefore, the valve member 11 can be rotated by a predetermined amount in forward and reverse directions.

Furthermore, an axial passage 11a through which the filling liquid flows is formed on the outer periphery of the valve member 11, and one end of this axial passage 11a is bored into the body 6 when the valve member 11 is located at a predetermined rotational angle position. Hole 6
The hole 6d is positioned so as to overlap with the opening 3a formed in the support member 3.
and communicates with the filling liquid tank via a conduit 14 connected thereto. In addition, the axial passage 1
The other end of 1a is connected to a radial through hole 11c formed in the valve member 11, and this through hole 11c is connected to a hole 6e and a hole 6e formed in the body 6 when the axial passage 11a is overlapped with the hole 6a. Hole 15 of cylinder 15
It communicates with the inside of the cylinder 15 via a.

Furthermore, a hole 6f formed in the outer peripheral surface of the valve member 11 has one end that communicates with the hole 6e and the other end that is formed in the body 6 when the valve member 11 is positioned at a predetermined rotational position different from the above. an axial passage 11 communicating with
b, and its hole 6f communicates via a check valve 16 with a liquid injection pipe 17 that fills the container 2 with the filling liquid. Rods 18 (Fig. 2) are arranged on both sides of the liquid injection pipe 17 in parallel thereto, and guide cones 19 for centering the container 2 on the rods 18 are provided.
is installed so that it can be raised and lowered freely.

A piston 20 is slidably fitted into the cylinder 15, and the lower end of the piston 20 is linked to a cam mechanism (not shown) so that it can move up and down within the cylinder 15 by a predetermined stroke. A part of the cylinder 15 is provided with a safety valve 25 that releases the pressure to the outside when the internal pressure exceeds a predetermined pressure.
shows a stepped discharge passage 15c with a smaller diameter on the radially inner side, and a stepped valve seat 15d of this discharge passage 15c.
The valve body 26 is provided with a valve body 26 seated from the outside thereof.

Both ends of a coil spring 27 wound around the cylinder 15 are attached to the protruding end of the valve body 26 from the cylinder 15 (Fig. 3). The cylinder 15 is seated and sealed inside the cylinder 15. A liquid passage 26a is formed in the valve body 26, one end of which opens to the outer peripheral surface of the valve body 26 at a position outward from the sealing portion with the valve body 26, and the other end of this liquid passage 26a opens to the outer peripheral surface of the valve body 26. It communicates with a recovery tank (not shown) provided separately from the filling liquid tank through a conduit 28 connected to the filling liquid tank.
A sealing member 29 is provided on the outer periphery of the valve body 26 at a position outward from the opening of the liquid passage 26a, and the sealing member 29 closes the discharge passage 15c, and the valve body 26 is placed on the stepped valve seat. The interior of the cylinder 15 is prevented from communicating with the atmosphere when the user leaves the seat 15d.

In the above configuration, when the axial passage 11a of the valve member 11 is in communication with the hole 6d of the body 6, the inside of the cylinder 15 includes the conduit 14 and the axial passage 11.
a, through hole 11c, and hole 6e to communicate with the inside of the filling liquid tank. In this state, piston 2
0 is lowered by the above-mentioned cam mechanism, the filling liquid is sucked into the cylinder 15 and the piston 20
When reaches the lowering end, suction of the filling liquid into the cylinder 15 is stopped.

During this time, the container 2 is raised while being centered by the guide cone 19 by a lift table (not shown), and the lower part of the liquid injection tube 17 is relatively inserted into the container 2. When the piston 20 reaches the lower end,
Since the cam lever 13 engages with a cam (not shown) and rotates the valve member 11 by a predetermined amount, the valve member 11
The axial passage 11a is closed on the inner circumferential surface of the body 6, and both ends of the axial groove 11b are formed into holes 6d6f.
are polymerized, respectively, thereby forming the axial passage 11b.
The inside of the cylinder 15 communicates with the liquid injection pipe 17 via.

From this state, when the piston 20 is raised by the above-mentioned cam mechanism, the filling liquid in the cylinder 15 is forced into the liquid injection pipe 17 through the axial passage 11b, and is passed through the check valve 16 into the container. 2 is filled with filling liquid. In this way, the filling liquid continues to be filled into the container 2 until the piston 20 reaches the upper end position, and when the piston 20 reaches the upper end position, a predetermined amount of filling liquid is filled into the container 2. . Then, when the piston 20 reaches the ascending end position, the cam lever 13 engages with the cam and is returned to its original position, so that the flow path of the entire valve member 11 is also returned to its original state.

Next, if the liquid filling pipe 17 or the axial passage 11b is blocked for some reason during filling of the filling liquid in the container 2, the liquid pressure in the cylinder 15 is reduced to a predetermined pressure by the piston 20 being raised. It will rise even more. In this case, the pressure inside the cylinder 15 pushes the valve body 26 of the safety valve 25 outward against the contractile force of the coil spring 27, and as a result,
The discharge passage 15c, which had been closed, is opened, and the filling liquid in the cylinder 15 flows through the liquid passage 26a and the conduit 28.
It will be discharged to the recovery tank mentioned above. At this time, since the inside of the discharge passage 15c is shut off from the atmosphere by the seal member 29 provided on the valve body 26, the filling liquid in the cylinder 15 is not discharged into the atmosphere.

Furthermore, in this embodiment, when the quantitative filling device 1 is removed from the support portion 3, the connection between the cylinder 15 and the conduit 28 can be easily separated by simply removing the coil spring 27 and pulling out the valve body 26. can.

Next, other embodiments of the present invention are shown in FIGS. 4a and 4b.
To explain with the drawings, in this embodiment, a discharge passage 30 communicating with the inside of the cylinder 15 is formed in the shaft portion of the piston 20, and a safety valve 25 having the same configuration as the first embodiment is provided at the lower part of the piston 20. It is installed. In this embodiment, the valve body 26
An engagement groove 32 in which the stopper 31 can engage is formed on the outer periphery of the valve body 26, and when the stopper 31 is engaged with the engagement groove 32, the valve body 26 is placed in a position where it is separated from the stepped valve seat 15d. I'm trying to keep it. (Chapter 4b
figure).

Therefore, it is clear that the same effects as those of the above-mentioned embodiments can be obtained in this embodiment as well. Moreover, in this embodiment, when cleaning the inside of the cylinder 15, the valve body 26 is pulled out to the outside and the stopper 31 is engaged with the engagement groove 32 formed on the outer periphery of the valve body 26. Since the cleaning liquid can be made to flow through the discharge passage 30 formed in the shaft portion of the piston 20 and the liquid passage 26a of the valve body 26, the inside of the cylinder 15, which has conventionally been disassembled and cleaned, can be easily cleaned. .

``Effect of the invention'' As described above, according to the invention, even if the pressure inside the cylinder increases abnormally during filling operation, the pressure can be released to the outside, so that the cylinder etc. can be prevented from being damaged by hydraulic pressure. In addition, in this case, the filling liquid can be collected via a conduit into a collection tank separate from the filling liquid tank, so that the metered filling device is contaminated with the discharged filling liquid. It is possible to prevent this, and also to eliminate the risk of the filling liquid in the filling liquid tank being contaminated by the collected filling liquid.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
3 is a sectional view taken along the line - in FIG. 1, FIG. 4a is a sectional view showing another embodiment of the present invention, and FIG. 4b is a sectional view taken along the line - 4a in FIG. It is a sectional view showing the state at the time of cleaning of the figure. 1... Quantitative filling device, 2... Container, 15...
Cylinder, 15d...Stepped valve seat, 20...Piston, 25...Safety valve, 26...Valve body, 26a...
Liquid passage, 28... Conduit, 29... Seal member, 1
5c, 30...Discharge passage.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A cylinder that communicates with the inside of a filling liquid tank, a piston that reciprocates within this cylinder to supply and discharge filling liquid into the cylinder, and a cylinder that communicates with the inside of the cylinder for filling. A quantitative filling device comprising a liquid injection pipe for injecting a liquid into a container, and a flow path switching valve that alternately switches communication between the filling liquid tank and the cylinder and between the cylinder and the liquid injection pipe, A discharge passage for discharging the filling liquid in the cylinder to the outside is formed in the cylinder or piston, and the discharge passage is communicated with a collection tank separate from the filling liquid tank, and a valve seat is provided in the discharge passage. In addition, a valve body is usually provided which is seated on the valve seat with a predetermined biasing force to close the discharge passage, and when the pressure inside the cylinder is applied to the valve disc and the pressure exceeds the biasing force. A safety device for a quantitative filling device, which is characterized in that the valve body is removed from the valve seat. (2) The outer circumferential sliding part of the valve body is slidably fitted in a discharge passage formed in the cylinder or piston in a fluid-tight manner, and one end of the valve body is fitted into the discharge passage in the valve seat. a liquid passage that is seated from the downstream side, has its other end protruding outside from the discharge passage, and has a discharge passage formed in the valve body between the downstream side of the valve seat and the outer peripheral sliding portion of the valve body; Claim 1 of the utility model registration, characterized in that the liquid passage is connected to a recovery tank via a conduit connected to an externally protruding portion of the valve body.
Safety devices for metered filling equipment as described in Section.