JP5046974B2 - Liquid filling device - Google Patents

Description

  The present invention relates to a liquid filling apparatus.

  As a liquid filling device, the opening of the filling valve can be switched between two levels (large flow and small flow), and up to a certain amount, the filling valve is opened wide and filled at a high flow rate at a high flow rate, and then filled There is already known a structure in which the opening of the valve can be reduced and filling can be performed accurately with a small flow rate.

  As a liquid filling apparatus of this type, as shown schematically in FIG. 12, a specially-shaped two-stage having two pistons (flow rate switching piston 52 and opening / closing piston 53) that can be pressed together in a cylinder 51. A structure using an air cylinder device is common. In this method, the opening / closing piston 53 disposed in the lower portion of the cylinder 51 is switched between a lower end position and a position above the lower end position, whereby the filling valve 50 disposed in the nozzle portion 54 is brought into a closed posture. In addition to switching to the open position, positioning the flow rate switching piston 52 disposed above the cylinder 51 at either the upper end position or the position near the lower end opens the opening / closing piston 53 with a large opening (see FIG. 12B). ) And a small opening (see FIG. 12 (c)).

  Here, 55 in FIG. 12 is a drive rod to which the filling valve 50 is attached at its lower end, and 56 biases the open / close piston 53 downward, that is, the drive rod 55 connected to the open / close piston 53. An energizing spring (return spring) for energizing the filling valve 50 in the closing direction via the flow rate switching upper air introduction path 57 for allowing air to flow into a region 51b facing the upper surface portion of the flow rate switching piston 52 in the cylinder 51; 58 is an open / close upper air introduction path through which air flows into a region 51c of the cylinder 51 facing the upper surface portion of the open / close piston 53; 61, air flows into a region 51a of the cylinder 51 facing the bottom surface portion of the open / close piston 53; A lower air introduction path for opening and closing, 59 is a lower regulating rod to which a flow rate switching piston 52 is attached, and 62 is a regulation. The upper restriction rod 63, which is attached so as to extend upward from the rod 59 and whose upper part projects upward from the cylinder 51, is screwed into a screw portion formed on the upper part of the upper restriction rod 62, and at a small opening degree. It is a restriction stopper that adjusts the opening degree (at the time of a small flow rate).

  Then, as shown in FIG. 12A, when the filling port 60 is closed by the filling valve 50, air (compressed air) is introduced from the opening / closing upper air introduction path 58 and the flow rate switching upper air introduction path 57. By moving the opening / closing piston 53 and the flow rate switching piston 52 to the lower end position, the filling valve 50 is pressed against the inner wall of the nozzle portion 54 to close the filling port 60. Also, by introducing air (compressed air) only from the opening / closing lower air introduction path 61, the drive rod 55 and the opening / closing piston 53 move to the large opening position closer to the upper side, as shown in FIG. 12 (b). The liquid can be introduced at a large flow rate. Also, as shown in FIG. 12C, air is introduced from the opening / closing lower air introduction passage 61 in a state where the air is introduced from the upper air introduction passage 57 and the flow rate switching piston 52 is in the lower position. Then, the restriction stopper 63 attached to the upper part of the upper restriction rod 62 abuts on the upper surface of the cylinder 51, and the drive rod 55 and the opening / closing piston 53 move to the lower opening position closer to the lower side, Liquid can be introduced at a small flow rate. In this state, the flow rate switching piston 52 which is going to move downward and the opening / closing piston 53 which is going to move upward are pressed through the lower regulating rod 59.

  In this liquid filling apparatus, by adjusting the position of the restriction stopper 63 with respect to the upper restriction rod 62, only the small flow rate opening degree can be adjusted. However, in principle, since the strokes of the pistons 52 and 53 are determined, there is a disadvantage that the opening degree of the large flow rate cannot be adjusted. In addition to this, in the small opening state, the pistons 52 and 53 are pressed and positioned to each other, so that the positioning force tends to be small, and the pressure of the liquid to be filled is high. In addition, the pistons 52 and 53, which are switching operations from a large flow rate to a small flow rate, are stopped without being lowered, and the positioning operation to a small opening (small flow rate) position becomes unstable. .

  By the way, when selling the liquid filling device to various users, the properties (viscosity, specific gravity, etc.) and supply conditions of the liquid filling vary depending on the user, so without reducing the processing capacity of the liquid filling, In order to perform the filling operation with high accuracy, it is desirable that the opening degree at the time of large opening (at the time of large flow rate) can be adjusted. For example, depending on the shape of the container to be filled, if the opening at the time of large opening (at a large flow rate) cannot be adjusted, when filling the liquid filling at a large flow rate, the liquid filling spills and overflows from the container. When the control at the time of filling is performed depending on the weight including the container, the measured weight fluctuates and the control cannot be performed satisfactorily. Therefore, it is desirable that the opening degree at the time of large opening (at the time of a large flow rate) can be adjusted so that such a problem does not occur.

  As what can cope with such a point, a liquid filling apparatus configured to be able to adjust the flow rate (opening degree) in any opening state of a large flow rate and a small flow rate is disclosed in Patent Document 1 and the like. As shown in FIG. 13, this liquid filling apparatus is provided with a large flow rate control air cylinder 73 and a small flow rate control air cylinder 74, and a large flow rate control air cylinder with respect to a drive rod 72 that moves the open / close valve 71 and the throttle member 70 up and down. The retracting rods 77 and 78 attached to the pistons 75 and 76 of the small flow rate control air cylinder 74 are engaged or connected via a relay plate 79. A relay plate 79 is fixed to the retracting rod 77 of the large flow control air cylinder 73 so as to be integrally moved up and down, and a step is provided at the upper end of the retracting rod 78 of the small flow control air cylinder 74. The step 78a is formed so that the relay plate 79 can be pushed upward by the step 78a. The upper portion of the step-out rod 78 is formed with a small diameter, so The position is not restricted. In addition, the first and second position adjusting screws 81 and 82 can adjust the protruding amount downward to the upper plate 80a of the case 80 so as to face the upper end portions of the retracting rods 77 and 78 from above. When the pistons 75 and 76 are raised, the upper end portions of the retractable rods 77 and 78 abut against the lower end portions of the first and second position adjusting screws 81 and 82, and the position restriction is performed. It is configured to be.

  When the drive rod 72 and the relay plate 79 are moved up to move the on-off valve 71 and the throttle member 70 in the direction of opening the large flow rate, the large flow rate control air cylinder 73 communicates with the space below the piston 75. By introducing air (compressed air) from the port 83, the piston 75 is pushed up, and the orifice portion 86 and the nozzle portion 87 are largely opened as shown in FIG. 13B. Further, when the drive rod 72 and the relay plate 79 are lowered so as to move the on-off valve 71 and the throttle member 70 from the large flow rate open state to the small flow rate open state, the small flow rate control air cylinder 74 uses a piston. After air (compressed air) is introduced from a port 84 communicating with the space below 76, the port 83 of the large flow control air cylinder 73 is opened to atmospheric pressure, thereby opening and closing as shown in FIG. 13 (c). Due to the urging force of the return spring 85 that pulls back the drive rod 72 to which the valve 71 is attached in the closing direction (downward) and the weight of the drive rod 72, the relay plate 79 contacts the stepped portion 78 a of the upper end portion of the retractable rod 78. It is configured to descend until it touches. Further, when closing the on-off valve 71 and the throttle member 70 from this small flow rate open state, in the small flow rate control air cylinder 74, the port 84 communicating with the space below the piston 76 is opened to the atmospheric pressure. The relay plate 79 and the drive rod 72 are lowered by the biasing force of the return spring (biasing spring) 85 and the weight of the drive rod 72.

According to this liquid filling apparatus, by adjusting the first position adjusting screw 81, the stroke of the large flow rate control air cylinder 73 can be changed, the flow rate at the time of the large flow rate can be changed, and the second position adjusting screw 82. By adjusting this, the stroke of the small flow rate control air cylinder 74 can be changed, and the flow rate at the small flow rate can be changed. Therefore, since the opening degree in the wide open state can be adjusted, the above-described problems (such as spilling or overflowing of the liquid filling) can be solved.
JP 2000-168727 A

  In the conventional liquid filling apparatus using a so-called two-stage air cylinder device as shown in FIG. 12, in addition to the trouble due to the inability to adjust the opening at a large opening, a two-stage air cylinder is used. Since the device is a two-stage air cylinder device having a special shape, there is a disadvantage that the manufacturing cost is high. In addition, since the driving force when switching from the large opening state to the small opening state and the positioning force in the small opening state are relatively small forces when the pistons 52 and 53 are pressed against each other, the filling valve 50 When the hydraulic pressure acting on the valve is high, the switching operation from the large opening state to the small opening state and the positioning operation in the small opening state may become unstable.

  Further, the liquid filling device disclosed in Patent Document 1 has an advantage that not only opening adjustment at a small opening but also opening adjustment at a large opening is possible, but in the closing direction at closing. Is only the urging force of the return spring (biasing spring) 85, so that the on-off valve 71 and the throttle member 70 are closed when the hydraulic pressure acting on the on-off valve 71 and the throttle member 70 as a filling valve is high. Insufficient force may cause liquid leakage.

  Further, when a return spring 85 having a large urging force is used, a large or high pressure large flow control air cylinder 73 and a small flow control air cylinder capable of generating a very large pressure that can resist the urging force. 74 and an air pressure generator are required, which may increase the manufacturing cost and increase the size of the liquid filling device and other equipment.

  The present invention solves the above-mentioned problems, and while suppressing an increase in manufacturing cost to a minimum, not only a small opening but also a large opening can be adjusted, and at a large opening (large flow), It is an object of the present invention to provide a liquid filling apparatus capable of stably performing a positioning operation and a moving operation at a small opening (small flow rate) and at a closing time.

  In order to solve the above-described problems, a liquid filling apparatus according to the present invention includes a driving valve for driving a filling valve in which a filling valve for opening and closing a filling port at the tip of a filling nozzle is attached to the tip, and one end connected to the driving rod. Double-acting double rod type large flow rate control cylinder with protruding and retracting rods, small flow rate control cylinder with protruding and retracting rods protruding on one side, and swingable in a cantilevered manner around a fulcrum at a predetermined position Supported, and the end side is pivotally connected to or engaged with the retracting rod of the small flow rate control cylinder, and the intermediate portion between the fulcrum and the connecting point of the retracting rod of the small flow rate control cylinder It is characterized in that an insulator-type link that can be brought into and out of contact with the other end of the control rod is provided.

  In the above configuration, compressed air (air) is introduced into one space of the large flow control cylinder so that one end of the rod for the large flow control cylinder retracts toward the inside of the cylinder and the other end protrudes further from the cylinder. ) And other fluids are moved until the other end of the large flow rate control cylinder comes into contact with the large flow rate adjustment member. The filling valve is opened largely through a drive rod connected to one end of the retracting rod.

  Further, by switching the space for introducing the working fluid to the large flow rate control cylinder from this state, the filling valve is moved in the closing direction through the drive rod together with the retracting rod of the large flow rate control cylinder. In parallel with this, a working fluid such as air is introduced into the small flow rate control cylinder and the end of the small flow rate control cylinder is moved so that it protrudes further. Is swung around the fulcrum. As a result, the lever-type link and the other end side portion of the rod for the large flow control cylinder come into contact with each other, and one end portion of the rod for the large flow control cylinder by the swinging of the lever-type link. Then, the filling valve is closed to a small opening degree via a drive rod connected to this portion.

  Also, with the working fluid still introduced into the other space of the large flow control cylinder, the working fluid is discharged from the cylinder by, for example, releasing the air introduced into the small flow control cylinder to atmospheric pressure. As a result, the filling valve is closed via the drive rod connected to one end of the retracting rod of the large flow rate control cylinder while the lever-type link is pushed back.

  According to the above configuration, since it can be positioned in a state of being pressed by the pressure of the working fluid at any time at the time of large opening (large flow), small opening (small flow), at the time of closing and at the time of opening switching, Positioning operation and switching operation can be performed with a stable and large force. At a small opening (small flow rate), the retracting rod of the large flow rate control cylinder and the retracting rod of the small flow rate control cylinder are pressed together via the lever type link. The force of the exit / retraction rod of the flow control cylinder is superior to that of the large flow control cylinder.For example, a large flow control cylinder and a small flow control cylinder can be combined with a piston with the same cross-sectional area. Even when using one with a small flow rate, it is possible to stably move the retracting rod of the small flow rate control cylinder in the protruding direction, and to force the retracting rod of the large flow rate control cylinder to the small opening position. And it can position reliably.

  Further, the liquid filling apparatus of the present invention is arranged so as to be able to contact the other end portion of the extension / retraction rod of the large flow rate control cylinder to adjust the extension / retraction stroke of the large flow rate control cylinder. A flow rate adjusting member, and a small flow rate adjusting member that is disposed so as to be able to contact the protruding end portion of the small flow rate control cylinder and adjusts the stroke of the small flow rate control cylinder. With this configuration, not only a small opening but also a large opening can be adjusted.

Further, the present invention is characterized in that the drive rod and the retracting rod of the large flow rate control cylinder are connected by a coaxial core.
With this configuration, the drive rod and the withdrawing / withdrawing rod of the large flow rate control cylinder move integrally with a coaxial core, so that the withdrawing / withdrawing rod of the large flow rate control cylinder can also be used as an extension part of the drive rod. As shown in FIG. 13, a relay plate is attached to a drive rod for driving a filling valve, and a retracting rod of a large flow rate control cylinder and a retracting rod of a small flow rate control cylinder are connected to the relay plate. Compared to the case where they are connected in parallel, the number of parts and installation space can be reduced.

  As described above, according to the present invention, the drive rod having the filling valve attached to the tip is connected to one end of the retracting rod in the double-acting double rod type large flow control cylinder, and the small flow control cylinder A lever-type link that rotates about a fulcrum is connected to or engaged with the end of the rod, and the other end side portion of the rod for large flow control is connected to the middle of the lever-type link. With a simple arrangement, the filling valve is at the tip regardless of the state (large opening (large flow), small opening (small flow), closed) and state switching. The positioning operation and switching operation of the drive rod attached to the part can be stably performed, and the reliability is improved.

In addition, since a large flow rate control cylinder for large flow rate control and a small flow rate control cylinder for small flow rate control can be used with a general structure, manufacturing costs can be reduced.
In addition, the structure as shown in FIG. 13 is adopted by connecting the drive rod and the retracting rod of the large flow rate control cylinder so as to be coaxially arranged so as to move up and down integrally. In comparison with this, the number of parts can be reduced, the space for disposing the filling valve drive unit can be reduced, and compactness can be achieved.

Hereinafter, a liquid filling apparatus according to an embodiment of the present invention will be described with reference to the drawings.
1 to 3 are longitudinal sectional views of a liquid filling apparatus according to an embodiment of the present invention, respectively. FIG. 1 shows a closed state, FIG. 2 shows a large flow rate, and FIG. 3 shows a small flow rate state. 4A is a side view taken along line IVa-IVa in FIG. 1, FIG. 4B is a side view taken along line IVb-IVb in FIG. 1, and FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG.

  As shown in FIGS. 1 to 5, the liquid filling apparatus is roughly provided with a liquid as a filling target and a nozzle portion 2 provided with a filling valve 1 and the like for opening and closing the liquid filling flow path. And a filling valve driving unit 3 for driving the filling valve 1. The nozzle part 2 is arrange | positioned in the location which becomes above the container (not shown) filled with the liquid at the time of filling. A filling valve drive unit 3 is assembled above the nozzle unit 2.

  The nozzle portion 2 is attached to the nozzle body 4 in which the inflow passage 4a to which the liquid is supplied and the main body flow path 4b in which the filling valve 1 is installed and extends vertically, and the lower end portion of the nozzle body 4 are attached and filled. The filling port portion 5 in which the port 5a is formed, the nozzle connecting cylinder 6 assembled on the upper part of the nozzle body 4, the seal member 10 and the seal pressing member 19 inserted in the nozzle connecting cylinder 6, and the nozzle connecting cylinder 6, a connecting frame 9 further connected above 6, a filling valve 1 that opens and closes the filling port 5a, and a seal pressing member 19 that vertically passes through the inside of the seal pressing member 19, and the filling valve 1 is attached to the tip portion. And a drive rod 7 for driving the filling valve.

  In this embodiment, the upper cylindrical portion 5b of the filling port portion 5 having a shape with which the upper thick diameter portion 1a of the filling valve 1 can be in close contact is disposed with a gap from the inner wall surface of the nozzle body 4. In addition, a small flow rate inflow hole 8 through which liquid can flow at a small opening (small flow rate) is formed in a part of the upper cylindrical portion 5b. In the state in which the upper cylindrical portion 5 b of 5 is closed by the upper thick diameter portion 1 a of the filling valve 1, a small flow rate of liquid is stably flowed through the small flow rate inflow hole 8. In addition, although the sealing material is arrange | positioned at the junction part of the nozzle main body 4 and the filling port part 5, the junction part of the nozzle main body 4 and the nozzle connection cylinder 6, etc., it is abbreviate | omitting in drawing.

  The filling valve drive unit 3 has the bottom end portion 11a fixed to the upper end portion of the connection frame 9, and has a box-shaped case portion 11 that forms an outer frame of the filling valve drive unit 3 and a front view as shown in FIG. A double-acting, double-rod type large flow rate control cylinder 12 having a retractable rod 12a that protrudes up and down is disposed at a substantially central portion of the filling valve drive unit 3, and is disposed on the right side and is disposed above. A single-acting single rod type small flow rate control cylinder 13 having a protruding / retracting rod 13a, a column body 14 extending vertically in the left-side space, and a longitudinal direction (depth direction) in the middle portion of the column body 14 in the vertical direction. Centering on the inserted fulcrum pin 15, the lever link 16 is swingably attached in a posture extending to the left side, and is disposed above the large flow control cylinder 12, and the large flow control cylinder. 12 exit / exit rods 12a A large flow rate adjusting member 17 that adjusts the troke, a small flow rate adjusting member 18 that is disposed above the small flow rate control cylinder 13 and adjusts the retracting stroke of the retracting rod 13a of the small flow rate control cylinder 13 is provided. ing.

  In the large flow rate control cylinder 12, the retractable rod 12 a is arranged so as to be movable in the vertical direction. The large flow rate control cylinder 12 has a retractable rod 12 a, a valve drive rod 7, and a large flow rate adjusting member 17. The provided stopper shaft 17a is arranged in a posture in which the same axis is formed along the vertical direction. In the large flow rate control cylinder 12, the upper end portion of the valve drive rod 7 is attached to the lower end portion (one end portion) of the retracting rod 12 a via the coupling joint 20. In the large flow rate control cylinder 12, air (compressed air) as a working fluid is introduced from a lower valve (first valve: see FIG. 4A) 12b into a cylinder lower space 12f facing the lower surface of the piston 12d. The air in the cylinder upper space 12g facing the upper surface of the piston 12d is released to the atmospheric pressure from the upper valve (second valve: see FIG. 4A) 12c, so that the retractable rod 12a rises together with the piston 12d. To do. Further, air is introduced from the upper valve 12c into the cylinder upper space 12g, and the air in the cylinder lower space 12f is released from the lower valve 12b, so that the retractable rod 12a is lowered integrally with the piston 12d. A first bracket 21 is attached to an upper end portion (the other end portion) of the retracting rod 12 a of the large flow rate control cylinder 12. The first bracket 21 can be brought into contact with the stopper shaft 17a of the large flow rate adjusting member 17 from below, and is connected to a first lifting pin 22 penetrating in the depth direction. The first raising / lowering pin 22 is disposed at a substantially central portion in the left-right direction of the lever-type link 16 so as to be able to come into contact with the bottom of the concave portion 16a formed to be depressed downward.

  The small flow rate control cylinder 13 is disposed so as to be movable up and down in a posture in which the retractable rod 13a protrudes upward, and a second bracket 23 is attached to the upper end portion of the retractable rod 13a. The second bracket 23 can be brought into contact with the stopper shaft 18a of the small flow rate adjusting member 18 from below, and is connected to a second lifting pin 24 penetrating in the depth direction. The second elevating pin 24 is connected to the right side of the lever type link 16, and the lever type link 16 is centered on the fulcrum pin 15 as the elevating rod 13 a of the small flow rate control cylinder 13 is raised and lowered. Swing. In the small flow rate control cylinder 13, air (compressed air) is introduced into the cylinder lower space 13f facing the lower surface of the piston 13d from the lower valve 13b, so that the retractable rod 13a rises together with the piston 13d. In the cylinder upper space 13g facing the upper surface of the piston 13d in the small flow rate control cylinder 13, a vent hole is formed for communicating this space with atmospheric pressure. Moreover, the air in the cylinder lower space 13f is released from the lower valve 13b, so that the retractable rod 13a can be lowered together with the piston 13d. In this embodiment, the ratio of the distance from the fulcrum pin 15 to the second lifting pin 24 (so-called lever ratio) with respect to the distance from the fulcrum pin 15 to the first lifting pin 22 in the lever link 16 is about Although it is set as 2 times, it is not restricted to this. In addition, the cylinder 12 for large flow control and the cylinder 13 for small flow control use the thing of the comparatively cheap general standard with which the cross-sectional area of a cylinder or piston 12d and 13d is the same, and is easy to obtain. Yes.

  The large flow rate adjusting member 17 and the small flow rate adjusting member 18 are respectively provided with stopper shafts 17a and 18a that can be moved up and down through screw holes formed in the upper surface portion 11b of the case portion 11, and upper end portions of the stopper shafts 17a and 18a. Positioning screws 17c for positioning the stopper shafts 17a and 18a in a posture in which the knobs 17b and 18b are fixed to the screw portions of the stopper shafts 17a and 18a and in contact with the upper surface portion 11b of the case portion 11. , 18c. In this embodiment, the contact plates 17d and 18d are attached to the tips of the stopper shafts 17a and 18a, and the contact plates 17d and 18d are the first bracket 21 of the large flow rate control cylinder 12 or the small flow rate. Although it contacts the second bracket 23 of the control cylinder 13, it is not limited to this.

  In the above configuration, when filling the liquid with a large flow rate, air (compressed air) as a working fluid is introduced from the lower valve 12b of the large flow rate control cylinder 12 to raise the retractable rod 12a. As a result, as shown in FIG. 2, the retracting rod 12 a of the large flow rate control cylinder 12 rises greatly until it abuts against the stopper shaft 17 a of the large flow rate adjusting member 17, whereby the filling valve is connected via the drive rod 7. 1 becomes a large opening state in which it is largely pulled up, and the liquid is filled at a large flow rate. At this time, air is introduced into the small flow rate control cylinder 13 from the lower valve 13b, and the retracting rod 13a is raised to the upper limit position. However, the present invention is not limited to this, and the lower valve 13b The air pressure may be released to atmospheric pressure.

  At the time of this large flow rate filling, the first elevating pin 22 coupled to the upper end of the retractable rod 12a of the large flow rate control cylinder 12 is not restricted from moving upward with respect to the lever-type link 16. The retractable rod 12a of the large flow rate control cylinder 12 can move to a large opening (large flow rate) position without being affected by the position of the lever link 16. Further, the large opening (large flow rate) position at this time can be well adjusted by the large flow rate adjusting member 17. At this time, the drive rod 7 and the filling rod are filled in a state where the retracting rod 12a of the large flow rate control cylinder 12 is pressed against the stopper shaft 17a of the large flow rate adjusting member 17 by the air pressure of the large flow rate control cylinder 12. The valve 1 is well positioned and can be filled with liquid at a large flow rate in a stable state.

  When switching the filling of liquid from a large flow rate to a small flow rate, air is introduced from the upper valve 12c of the large flow rate control cylinder 12 and air is released from the lower valve 12b, and the air pressure is used to control the large flow rate. The retractable rod 12a of the cylinder 12 is lowered. For the small flow rate control cylinder 13, the state in which air is introduced from the valve 13b is maintained (or the introduction of air from the lower valve 13b is started), and the retracting rod 13a is set to the upper limit position. As a result, as shown in FIG. 3, the right side portion of the lever-type link 16 is inclined slightly upward, and the retractable rod 12 a of the large flow rate control cylinder 12 is brought into contact with the concave portion 16 a of the lever-type link 16. Stop in the state of entering and abutting. As a result, the filling valve 1 is slightly opened through the drive rod 7, and the liquid is filled at a small flow rate.

  Here, when switching from the large flow rate to the small flow rate, the piston built in the cylinder is pushed down by the air pressure of the large flow rate control cylinder 12, and the retracting rod 12a of the large flow rate control cylinder 12 is lowered. In the state where the first elevating pin 22 connected to the retracting rod 12 a of the large flow rate control cylinder 12 is in contact with the lever type link 16, the large flow rate control cylinder 12 is connected via the lever type link 16. The retractable rod 12a and the retractable rod 13a of the small flow rate control cylinder 13 are pressed against each other. However, the lever-type link 16 is a first elevating pin centered on a fulcrum pin 15 supported by the support body 14. Since the distance to the second elevating pin 24 is approximately twice the distance to 22 (depending on the lever ratio), the lever-type link 16 is connected to the retracting rod 13 of the small flow rate control cylinder 13. Well is kept pushed up by this result, a small opening (low flow rate) condition is better retained. Therefore, the large flow rate is stably switched to the small flow rate, and the small opening (small flow rate) state is maintained well, and the filling operation is performed well. As described above, in this embodiment, in the small opening (small flow rate) state, the upper cylindrical portion 5b of the filling port portion 5 is closed by the upper large diameter portion 1a of the filling valve 1, Through the small flow rate inflow hole 8, a small flow rate of liquid is stably flowed.

  Thereafter, when the filling operation is stopped, the valve 13b of the small flow rate control cylinder 13 is opened to the atmospheric pressure while air is being introduced from the upper valve 12c of the large flow rate control cylinder 12. Is discharged. As a result, as shown in FIG. 1, the piston 13d and the retracting / retracting rod 13a of the small flow rate control cylinder 13 are lowered to the lower limit position, whereby the lever-type link 16 is brought into a substantially horizontal posture, and the flow rate is increased accordingly. The retracting / retracting rod 12a of the control cylinder 12 is lowered, and accordingly, the filling valve 1 is closed via the drive rod 7, and the filling of the liquid is stopped. At this time, the filling valve 1 is closed by being pressed with a sufficiently large pressure by the air pressure of the cylinder 12 for large flow control, so that the filling valve 1 is closed in a good state, for example, the liquid pressure of the liquid to be filled is high. Even in this case, no liquid leakage occurs.

  As described above, according to the above configuration, the positioning is performed by the pressure of the working fluid in any state of the large opening (large flow), the small opening (small flow), and the closed state and at the time of switching. The operation and the switching operation can be performed stably. When the opening degree is small (small flow rate), the retracting rod 12a of the large flow rate control cylinder 12 and the retracting rod 13a of the small flow rate control cylinder 13 are pressed against each other via the lever type link 16. Depending on the lever ratio, the retractable rod 13a of the small flow rate control cylinder 13 protrudes stably and the retractable rod 12a of the large flow rate control cylinder 12 and the drive rod 7 are forced to be in a small opening position. Positioning can be ensured.

  Further, according to the above configuration, the drive rod 7 and the extension / retraction rod 12a of the large flow rate control cylinder 12 are arranged so as to be coaxial and are coupled so as to move up and down as a whole. As shown, compared to the case where cylinders 77 and 78 are provided on the left and right of the drive rod (operation rod 72) for driving the filling valve (open / close valve 71 and throttle member 70), respectively, The retractable rod 12a is also used as an extended portion of the drive rod 7, so that the number of parts can be reduced and the space for disposing the filling valve drive portion can be reduced.

  Further, according to the above configuration, the large flow rate control cylinder 12 for large flow rate control can be a double-acting double rod type having a general structure which is not a special shape, and for small flow rate control. As the small flow rate control cylinder 13, it is possible to use a single-acting single rod type having a general structure and not having a special shape. Therefore, this also has an advantage that the manufacturing cost can be reduced.

  In the above embodiment, the case has been described in which the retractable rod 13a of the small flow rate control cylinder 13 is rotatably connected to the lever link 16 via the second elevating pin 24. As shown in FIGS. 6 to 8, the lever-type link 16 has a lower position at a position corresponding to the second elevating pin 24 inserted into the retracting rod 13 a of the small flow rate control cylinder 13. A concave-shaped portion 16b that opens may be formed, and the second lift pin 24 may be in contact with and engaged with the concave-shaped portion 16b of the lever-shaped link 16 from below. Also with this configuration, the lever-type link 16 swings in conjunction with the lifting / lowering operation of the retracting rod 13a of the small flow rate control cylinder 13, and the same effect as the above embodiment can be obtained.

  In the above-described embodiment, the case of the liquid filling apparatus used in an environment in which air pressure is always applied to or held in the large flow rate control cylinder 12 or the small flow rate control cylinder 13 has been described. However, in an environment where the air pressure may be released, in the above structure, if the air pressure is released with the filling valve 1 closed, the air pressure does not act in the direction of closing the filling valve 1, There is a risk of leakage. Therefore, in such an environment where the air pressure may be released, as shown in FIGS. 9 to 11, even when the air pressure is released, the filling valve 1 can be held in a closed state. An energizing spring 30 for maintaining a closed state (for preventing liquid leakage) may be added to give a certain energizing force to maintain the closed state of the filling valve 1 satisfactorily. Even when the pressure is released, liquid leakage can be prevented.

  In the above embodiment, the case where compressed air is used as the working fluid for the large flow rate control cylinder 12 and the small flow rate control cylinder 13 is described. However, the present invention is not limited to this, and various gases and liquids are used. It is possible to use.

It is a longitudinal section at the time of closure of a liquid filling device concerning an embodiment of the invention. It is a longitudinal cross-sectional view at the time of the large flow volume of the liquid filling apparatus. It is a longitudinal cross-sectional view at the time of the small flow volume of the liquid filling apparatus. (A) is a side view taken along line IVa-IVa in FIG. 1, and (b) is a side view taken along line IVb-IVb in FIG. It is the VV line plane sectional view of FIG. It is a longitudinal cross-sectional view at the time of closing of the liquid filling apparatus which concerns on other embodiment of this invention. It is a longitudinal cross-sectional view at the time of the large flow volume of the liquid filling apparatus. It is a longitudinal cross-sectional view at the time of the small flow volume of the liquid filling apparatus. It is a longitudinal cross-sectional view at the time of closing of the liquid filling apparatus which concerns on other embodiment of this invention. It is a longitudinal cross-sectional view at the time of the large flow volume of the liquid filling apparatus. It is a longitudinal cross-sectional view at the time of the small flow volume of the liquid filling apparatus. It is a longitudinal cross-sectional view of the conventional liquid filling apparatus, (a) at the time of closing, (b) at the time of a large flow volume, (c) shows the time of a small flow volume. It is a longitudinal cross-sectional view of the other conventional liquid filling apparatus, (a) at the time of closing, (b) at the time of a large flow rate, (c) shows the time at the small flow rate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filling valve 2 Nozzle part 3 Filling valve drive part 4 Nozzle main body 5 Filling port part 5a Filling port 7 Drive rod 12 Large flow rate control cylinder 12a Retraction / retraction rod 13 Small flow rate control cylinder 13a Retraction / retraction rod 14 Prop body 15 Support pin 16 lever type link 17 large flow rate adjusting member 18 small flow rate adjusting member 21 first bracket 22 first elevating pin 23 second bracket 24 second elevating pin 30 biasing spring

Claims (3)

A drive rod for driving the filling valve, which is attached to the tip of the filling valve for opening and closing the filling port at the tip of the filling nozzle;
A double-acting double rod type large flow rate control cylinder having a retractable rod having one end connected to the drive rod;
A small flow rate control cylinder having a retractable rod protruding on one side;
The fulcrum and the small flow rate control cylinder are supported so as to be swingable in a cantilevered manner around a fulcrum at a predetermined position, and the end side is pivotally connected to or engaged with a retracting rod of the small flow rate control cylinder. And a lever-type link that can be brought into contact with and separated from the other end of the large flow rate control cylinder at an intermediate portion between the connecting point of the rod and the rod. apparatus. A large flow rate adjusting member that is arranged so as to be able to contact the other end side portion of the rod of the large flow rate control cylinder and adjusts the stroke of the large flow rate control cylinder;
A small flow rate adjusting member that is arranged so as to be able to contact the protruding end portion of the small flow rate control cylinder and adjusts the stroke of the small flow rate control cylinder. The liquid filling apparatus according to claim 1.   The liquid filling apparatus according to claim 1, wherein the drive rod and the retractable rod of the large flow rate control cylinder are connected by a coaxial core.

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