JP2008239217A - Cylinder piston type filling apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the filling of a container 2 whose capacity is larger than that of a cylinder 28, by activating a single cylinder piston 24 a plural number of times. <P>SOLUTION: It is made possible to implement the filling of a container whose capacity is larger than that of a cylinder 28 through keeping containers 2 conveyed successively by a container transporting conveyer 4, at standstill for a prescribed period of time at a filling position P, by the use of an intermittently driven screw 6, during which a cylinder piston 24 is caused to perform filling action one or two times. The driving of the screw 6 and the cylinder piston 24 is performed by servo-motors 10, 56 controlled by a control device for an accurate metered filling of a liquid and securement of required filling time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cylinder piston type filling device that discharges a filling liquid contained in a cylinder by a reciprocating movement of a piston and fills the inside of the container, and particularly relates to a cylinder piston type filling device that can be used for containers of different capacities. Is.

  The cylinder-piston type filling device retracts the piston slidably fitted in the cylinder and sucks the filling liquid into the cylinder, and then advances the piston to discharge the filling liquid stored in the cylinder. The container is filled. When this cylinder-piston type filling device is also used for containers with different capacities, conventionally, a cylinder matched to the container with the largest capacity is manufactured, and when filling a container with a small capacity, the stroke amount of the piston is reduced. It was supported by adjusting.

  However, when the capacity of the shared container is significantly different, for example, when the container is shared from a 180 cc container to a 2000 cc container, a cylinder capable of accommodating a maximum capacity of 2000 cc is prepared, and other containers with different capacities are prepared. In this case, the stroke amount is changed to cope with this problem, but there is a problem that a large error occurs when filling the 180 cc container having the smallest capacity. Therefore, a cylinder piston type filling device has been proposed in which two sets of cylinder pistons are used to fill a plurality of containers having different capacities (see, for example, Patent Document 1).

  A cylinder piston type filling device (referred to as a liquid dispensing device in the present invention) according to the invention described in Patent Document 1 is a pipe from a raw material container 3 (filling liquid tank) to a discharge unit 6 (filling nozzle). The piston pump 4 is provided in the portion 14. The piston pump 4 is composed of two pushing pistons 10 and 11 housed in one housing 8 and 9, respectively, and the pistons 10 and 11 are operated independently.

In Patent Document 1, in order to obtain various amounts of discharged liquid with the piston-type filling device, only one piston or both pistons 10 and 11 need to be operated, and the amount of liquid to be discharged is stepwise. In order to change to the above, it is described that the rooms 8 and 9 should be made different in size.
Japanese Patent Publication No. 60-50677 (2nd page, Fig. 1)

  As in the cylinder piston type filling device described in Patent Document 1, when a plurality of cylinder pistons are arranged to serve as containers of different capacities, there is a problem that the installation space becomes large. In addition, each piston requires a driving means, which is expensive and requires complicated control.

  The present invention has been made to solve the above-mentioned problems, and can reduce the error in the filling amount even for a small container, does not increase the installation space, and has a complicated structure. It is an object of the present invention to provide a cylinder piston type filling device that does not need to be performed.

  The present invention includes a filling nozzle that discharges a filling liquid into a container, a cylinder that contains a filling liquid to be sent to the filling nozzle, a piston that is slidably fitted in the cylinder, A piston driving means for driving; an intermittent conveying means for intermittently conveying the container; a conveying driving means for driving the intermittent conveying means; and a control means for controlling operations of the piston driving means and the conveying driving means. Cylinder piston type filling device that fills the container with a predetermined amount of filling liquid stored in the cylinder by the operation of the piston while the container is supplied below the filling nozzle by the intermittent conveying means and is stopped for a predetermined time. The control device stores the stop time of the intermittent conveying means and the piston stroke amount according to the amount of filling liquid to be filled, and fills the filling liquid below the capacity of the cylinder with the container. When filling, the intermittent conveying means is stopped for a time corresponding to the amount of the filling liquid, and the piston is filled by one reciprocating motion, and when filling the container with a filling liquid exceeding the capacity of the cylinder. The intermittent conveying means is stopped for a time corresponding to the amount of filling liquid, and the piston is reciprocated a plurality of times to perform filling.

  The invention according to claim 2 is characterized in that the intermittent conveying means includes a screw in which a spiral groove that engages with a container conveyed in one row is formed.

  The capacity of the cylinder was made smaller than the container with the maximum capacity, and the container with a capacity larger than the capacity of the cylinder was filled by reciprocating the piston multiple times. Thus, it is possible to obtain a cylinder-piston-type filling device that has a larger capacity that can be used in comparison with the conventional one and that can perform high-precision filling.

  The cylinder piston type filling device of the present invention supplies the container continuously transported to the lower part of the filling nozzle by the intermittently driven transport means and temporarily stops it, while retracting the piston in the cylinder. After sucking the liquid, the piston is pushed in to send the liquid in the cylinder to the filling nozzle to fill the container. When the capacity of the cylinder is larger than the capacity of the container, the intermittent conveying means is stopped. When the container is filled by reciprocating the piston once and filling a container larger than the capacity of the cylinder, filling is performed by reciprocating the piston several times, while the container stops at the filling position. As described above, the configuration in which the operation of the intermittent conveying means is controlled by the control device reduces the error in the filling liquid amount when filling a small container. With, to achieve the goal of a compact installation space.

  Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. FIG. 1 is a plan view showing the overall configuration of a cylinder piston type filling apparatus according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a filling mechanism that discharges a filling liquid measured by the cylinder piston and fills the container. It is. The cylinder piston type filling device according to this embodiment includes a container transport conveyor 4 that continuously transports containers 2 filled with liquid in a row, and a container 2 that has been transported continuously by the container transport conveyor 4. And a screw 6 that is cut off at regular intervals. The screw 6 is intermittently driven by a transport driving means described later, and temporarily stops the containers 2 transported by the continuously transported container transport conveyor 4. A position P on the container conveyor 4 where the container 2 is stopped by the screw 6 is a filling position where the filling mechanism 8 performs filling.

  The screw 6 is driven by a servo motor 10 as a conveyance driving means. A timing belt (not shown) wound around a pulley 12 coupled to the output shaft of the servo motor 10 and a pulley 16 coupled to an intermediate shaft 14 rotatably supported by the frame 4a of the container transport conveyor 4. The drive of the servo motor 10 is transmitted to the intermediate shaft 14 via. Further, the rotation of the intermediate shaft 14 is transmitted to the screw 6 via a transmission shaft 18 that connects the intermediate shaft 14 and the drive shaft 6a of the screw 6 by universal joints at both ends.

  The container transport conveyor 4 is continuously driven to transport a row of containers 2 in close contact with each other. A screw 6 is arranged at a filling position P on the container conveying conveyor 4. By engaging the containers 2 one by one in the spiral groove of the screw 6, the containers 2 are separated at predetermined intervals, and the rotation is stopped. By doing so, each container 2 is stopped at a predetermined position. In this embodiment, six filling nozzles 20 are provided, and each container 2 is positioned below each filling nozzle 20 and stopped. The next container 2 (see the container indicated by reference numeral 2A in FIG. 1) of the six containers 2 that are supplied to the filling position P and filled at a time is the inlet side of the screw 6 when the screw 6 stops. To stop all subsequent containers 2 on the container conveyor 4 that is continuously driven. In this embodiment, the filling nozzle 20 is fixed to a fixed plate 22 disposed on the opposite side of the screw 6 with the container conveying conveyor 4 interposed therebetween, and does not follow the movement of the container 2.

  The six filling nozzles 20 are filled with the filling liquid from different cylinder pistons 24 respectively. A filling mechanism 8 is installed on the side of the filling position P on the container transport conveyor 4 (the position where the six containers 2 are temporarily stopped by stopping the screws 6). In the filling mechanism 8 of this embodiment, three cylinder pistons 24 are configured as one set, and two sets are arranged.

  The two sets including the three cylinder pistons 24 have the same configuration, and FIG. 2 shows one of them. A circular plate 28 is fixed on the bottom plate 26 a of the frame 26 of the filling mechanism 8, and three guide stays 30 are fixed upright at equal intervals near the outer periphery of the circular plate 28. A support plate 32 is fixed to the upper ends of these three guide stays 30, and a cylindrical center tube 34 extending through the center of the support plate 32 and extending upward is fixed. A circular mounting plate 36 is fixed to the upper end of the center cylinder 34. Three cylinders 38 are mounted upright at equal intervals on the outer periphery of the mounting plate 36. These cylinders 38 are fixed to the mounting plate 36 with a filling liquid supply / discharge pipe 40 connected to the upper ends thereof. Further, the piston 42 is inserted from the opening at the lower end of the cylinder 38, and slides up and down in the cylinder 38 through the piston seal 42a. A piston rod 44 is connected to the lower surface side of the piston 42, and is supported through the intermediate support plate 32 so as to be movable up and down. As the piston rod moves up and down, the piston 42 moves up and down in the cylinder 38.

  The lower end of the piston rod 44 is connected to a lifting plate 46 that moves up and down along the three guide stays 30. In this elevating plate 46, three piston rods 44 are connected at three intervals near the outer periphery at equal intervals, and three guide stays 30 penetrate through circular holes formed between the piston rods 44. . Further, a nut 48 having an internal thread formed on the inner surface is fixed to the center of the elevating plate 46. A ball screw 50 is screwed onto the nut 48. The upper end of the ball screw 50 is rotatably supported by a ball bearing 52 held in the lower end portion of the center cylinder 34, and the elevation is restricted.

  The lower end of the ball screw 50 extends downward through the circular plate 28 on the bottom plate 26a, and a pulley 54 is coupled to the lower end portion so as to rotate integrally. A servo motor 56 for driving the piston is installed adjacent to the circular plate 28 fixed on the bottom plate 26a of the frame 26 of the filling mechanism 8. A pulley 58 is coupled to the output shaft 56 a of the servo motor 56, and a timing belt 60 is wound around the pulley 58 and the pulley 54 coupled to the lower end of the ball screw 50. Accordingly, when the pulley 58 of the output shaft 56a is rotated by driving the servo motor 56, this rotation is transmitted to the pulley 54 of the ball screw 50 via the timing belt 60, and the ball screw 50 is rotated. As the ball screw 50 rotates, the nut 48 screwed into the ball screw 50 moves up and down, and the three piston rods 44 connected to the nut 48 via the lifting plate 46 move up and down. As the piston rods 44 move up and down, the pistons 42 in the cylinders 38 slide up and down. The operations of the servo motor 56 for driving the piston and the servo motor 10 for operating the screw 6 are controlled by a control device (not shown). The control device stores the stop time of the container 2 and the stroke amount of the piston 42 according to the capacity of the container 2 to be filled, that is, the amount of liquid to be filled in the container 2, and corresponds to the amount of liquid to be filled in the container 2 The servo motor 10 and the servo motor 56 are controlled so that the stop time and the stroke amount are set.

  A filling liquid passage opening / closing valve 62 is provided above the filling liquid supply / discharge passage 40 connected to the upper end of the cylinder 38. The valve body of the opening / closing valve 62 is seated on the valve seat by the operation of the valve opening / closing air cylinder 64, and opens and closes the filling liquid passage by being separated. A liquid supply passage 66 is connected to the upper side of the open / close valve 64, and a discharge passage 68 is connected to the lower side. The liquid supply passage 66 is connected to a filling liquid tank (not shown) via a supply pipe 70 (see FIG. 1), and the discharge passage 68 is connected to the filling nozzle 20. Accordingly, when the opening / closing valve 62 is opened from the state where the piston 42 is raised in the cylinder 38 and the piston 42 is lowered, the filling liquid is sucked from the filling liquid tank and stored in the cylinder 38, and then opened and closed. When the valve 64 is closed and the piston 42 is raised, the filling liquid in the cylinder 38 is sent from the discharge passage 68 to the filling nozzle 20 and discharged to be filled in the container 2. In addition, a liquid valve (not shown) is also provided on the filling nozzle 20 side. When the filling liquid is sucked into the cylinder 38 by the lowering of the piston 42, the liquid valve is closed and the piston 42 is raised to fill. When performing the operation, the liquid valve is opened.

  The operation of the cylinder-piston filling device according to the above configuration will be described. In this embodiment, the capacity of the cylinder 38 is set to 1000 cc. The containers 2 filled with liquid are also used in a plurality of sizes. For example, four kinds of containers 2 of 200 cc, 750 cc, 1500 cc, and 1800 cc are filled.

  The containers 2 continuously conveyed by the container conveying conveyor 4 are engaged with the spiral groove of the screw 6 and separated at a predetermined interval. The screw 6 is intermittently operated and stopped repeatedly. When the six containers 2 being held reach the respective stop positions of the filling position P, the screw 6 stops and each container 2 is filled. Position below the nozzle 20. The screws 6 are driven by a servo motor 10 controlled by a control device (not shown), and the six containers 2 stopped by the screws 6 are accurately positioned below the filling nozzles 20. Further, as will be described later, the cylinder piston 24 is stopped accurately for the time required for the operation.

  In the filling mechanism 8, the valve body of the opening / closing valve 62 is raised by the valve driving air cylinder 64 to open the opening / closing valve 62 and close the liquid valve of the filling nozzle 20 (not shown). In this state, the piston 42 located at the ascending position in the cylinder 38 is lowered by driving the piston driving servo motor 56. The driving force of the servo motor 56 is transmitted to the ball screw 50 through the pulley 58 connected to the output shaft 56a of the servo motor 56, the timing belt 60, and the pulley 54 connected to the lower end of the ball screw 50. Rotate 50. Due to the rotation of the ball screw 50, the nut 48 screwed into the ball screw 50 is lowered from the raised position, and the piston rod 44 and the piston 42 are lowered. When the piston 42 is lowered, the filling liquid in the filling liquid tank (not shown) is sucked into the cylinder 38 through the liquid supply passage 66, the open opening / closing valve 62 and the supply / discharge passage 40. The descending amount of the piston 42 is accurately controlled by a piston drive servo motor 56 controlled by a control device (not shown). The piston 42 accurately descends by an amount corresponding to the filling amount, and the filling liquid is discharged into the cylinder 38. Housed inside.

  After the piston 42 is lowered by a predetermined distance in the cylinder 38 and the filling liquid is accommodated in the cylinder 38, the opening / closing valve 62 is closed and the liquid valve (not shown) of the filling nozzle 20 is opened to raise the piston 42. When the piston 42 rises, the filling liquid stored in the cylinder 38 is sent to the filling nozzle 20 through the supply / discharge passage 40 and the discharge passage 68 and discharged to be filled in the container 2. When the amount of liquid filled in the container 2 is 200 cc or 750 cc, the piston 42 can be accurately filled by reciprocating a predetermined distance once according to the amount of filling. When the filling amount is 1500 cc or 1800 cc, the cylinder 38 has a capacity of 1000 cc, so that the piston is reciprocated twice to perform filling. In this case, it may be filled with 1000 cc at the first time, 500 cc or 800 cc at the second time, and half at the first time and the second time, that is, 750 cc twice, or 900 cc twice. You may make it perform filling. Thus, in order to perform filling twice, the stop time of the container 2 at the filling position P by the screw 6 is stopped twice as long as 200 cc or 750 cc in which filling is performed once.

  In this embodiment, the capacity of the cylinder 38 is set to 1000 cc, and the container 2 having a filling amount exceeding 1000 cc is filled by operating the piston 42 twice. For example, when a cylinder of a large size is used so that a 2000 cc container 2 can be filled at a time as in the conventional case, if a small container 2 such as 180 cc is filled, an error in the filling amount increases. However, if the filling of 180 cc is performed by the cylinder 38 of 1000 cc, the filling can be performed with an error much smaller than the conventional one. In addition, the capacity | capacitance of the container 2 which fills is not limited to the said capacity | capacitance, What kind of capacity is possible. Further, the capacity of the cylinder 38 is not limited to 1000 cc, but may be other sizes. Furthermore, the operation of the cylinder piston 24 is not limited to two times, and the cylinder piston 24 can be filled by three or more operations.

It is a top view which shows the structure of the whole cylinder piston type filling apparatus. Example 1 It is a longitudinal cross-sectional view of the filling mechanism of the cylinder piston type filling device.

Explanation of symbols

2 Container 6 Intermittent conveying means (screw)
10 Transport drive means (servo motor)
20 Filling nozzle 38 Cylinder 42 Piston 56 Piston drive means (servo motor)

Claims (2)

A filling nozzle for discharging the filling liquid into the container, a cylinder for containing the filling liquid to be sent to the filling nozzle, a piston slidably fitted in the cylinder, and a piston drive for driving the piston Means, intermittent transport means for intermittently transporting the container, transport drive means for driving the intermittent transport means, and control means for controlling the operation of the piston drive means and the transport drive means,
Cylinder piston type filling device that fills the container with a predetermined amount of filling liquid stored in the cylinder by the operation of the piston while the container is supplied below the filling nozzle by the intermittent conveying means and is stopped for a predetermined time. In
The control device stores the stop time of the intermittent conveying means and the piston stroke amount according to the filling liquid amount to be filled,
When filling the container with a filling liquid less than the capacity of the cylinder, the intermittent conveying means is stopped for a time corresponding to the amount of the filling liquid, and filling is performed by one reciprocating movement of the piston, so that the capacity exceeds the capacity of the cylinder. When filling the container with the filling liquid, the cylinder piston-type filling device is characterized in that the intermittent conveying means is stopped for a time corresponding to the amount of the filling liquid and the piston is reciprocated a plurality of times for filling. .   The cylinder piston type filling device according to claim 1, wherein the intermittent conveying means includes a screw having a spiral groove with which a container conveyed in one row is engaged.

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