JP2000006907A - Filling method of liquid object and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate both of a leakage quantity in a pump, which changes according to the fluctuation of temperatures, and a volume change quantity at a nozzle portion at a time. SOLUTION: In an apparatus for filling a container with a liquid object through a displacement type pump, a measured value obtained by a first measuring instrument S1 for a temperature or a viscosity, which is set on the suction side of the pump, and stored information S3 fetched out are processed by an operation means S4 to perform a leakage quantity detection S5 for the pump. On the other hand, a measured value obtained by a second measuring instrument S2 for a temperature or a viscosity, which is set on the discharge side of the pump, and the stored information S3 fetched out are processed by an operation means S6 to perform a volume change quantity detection S7 for the liquid object. The detected leakage quantity S5 and detected volume change quantity S7 are checked for each other by a filling quantity regulating means S8, and a driving pulse quantity setting S9 is performed in relationship with a basic filling quantity S10 to control the rotation of a servomotor 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for always filling a packaging container with a fixed amount of a liquid or viscous substance by a positive displacement pump.

[0002]

2. Description of the Related Art Problems with conventional pumps A conventionally known positive displacement pump such as a vane pump or a Pinton pump can apparently fill a packaging container in a fixed amount by keeping its rotation angle or stroke constant. It is used for quantitative filling of liquid substances. However, the volume of the liquid material changes significantly depending on the temperature, and the filling amount changes depending on the temperature change. Therefore, there is a device that measures a change in temperature or viscosity of a liquid material and automatically sets a filling amount according to the measured value. The change in volume due to change is painful, and these do not change on average with each other,
There is a problem that the filling amount in proportion to the temperature change cannot be controlled.

[0003]

Therefore, the present invention measures the temperature at each of the inlet and outlet sides of the pump to control the filling amount based on both of these measured values in order to achieve an accurate filling amount. is there.

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention of the method is directed to an apparatus for sequentially filling a liquid substance to a container fed at regular intervals through a positive displacement pump, the temperature or viscosity of the liquid being set on the suction side of the positive displacement pump. The first measuring device S1 measures the liquid material on the suction side, and the measured value and the stored information S3 stored in advance are processed by the calculating means S4 to detect the amount of leakage at the pump according to the measured value. S5 is performed. On the other hand, a liquid material on the discharge side is measured by a second measuring device S2 for temperature or viscosity installed on the discharge side of the positive displacement pump, and the measured value and stored information S3 stored in advance are processed by the calculating means S6. Then, the volume change amount of the liquid material is detected S7. Then, the detected leakage amount S5 and the detected volume change amount S
7 is compared with the filling amount adjusting means S8 and the basic filling amount S1 is checked.
An error from 0 is calculated, and a drive pulse amount obtained by correcting the error is set S9. Then, the servomotor for driving the positive displacement pump is rotated by the corrected rotation angle corresponding to the driving pulse amount S9.

[0005] The invention of the device is also directed to a positive displacement pump in which a storage tank is connected to a suction side and a discharge nozzle is connected to the same discharge side. An output circuit and an output circuit of a second temperature or viscosity measuring device installed on the discharge side of the positive displacement pump are connected to the controller. The controller processes a value measured by the first measuring device with an arithmetic unit in light of the extracted stored information, and detects a leakage amount of the pump according to the measured value. Further, the controller processes the measured value of the second measuring device with the calculating means in light of the extracted storage information, and detects the volume change of the liquid material. Further, the controller checks the detected leak amount and the detected volume change amount by a filling amount adjusting means to calculate an error from the basic filling amount. Then, the means for setting the driving pulse amount determines the pulse amount corresponding to the error amount, and drives the positive displacement pump by the servo motor by the corrected rotation angle corresponding to the driving pulse amount.

As a result, the relative amount of leakage inside the pump corresponding to the temperature value or the viscosity value and the change in the volume of the discharge side corresponding to the temperature value or the viscosity value are relatively observed, while following the basic filling amount. It is corrected collectively.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vane type volume pump 10 shown in FIG. 2 has a storage tank 11 on its suction side and a nozzle 1 on its discharge side.
2 and the vane rotating shaft 13 and the servo motor 1
4 are connected via a belt 15, and the servomotor is connected to a controller 16 via a signal circuit 17. When a bag 19 supported by a pair of clamps 18 and moving on a circular orbit at equal intervals stops below the nozzle 12 and its signal is input from the generator 20 to the controller 16, the servomotor 14 is turned on by the input means 21. Then, the liquid material in the storage tank 11 is filled into the bag 19 by rotating by an angle corresponding to a predetermined basic filling amount.

As the temperature increases, the amount of liquid leaking from the discharge side toward the suction side in the pump 10 tends to increase, and at the same time, the expansion of the liquid in the nozzle 12 increases, so that the rotation angle of the pump is constant. In some cases, the substantial fill decreases inversely with increasing temperature. However, in this case, depending on the temperature value, the relative change between the leak amount and the expansion amount is not always proportional, and the following means functions to correct it.

That is, the first measuring device 22 provided on the tank wall, which is the suction side of the positive displacement pump, and the second measuring device 23 provided on the nozzle are connected to the controller 1 via output circuits.
Connect to 6. Since the storage information S3 in FIG. 1 is preset with the leakage amount data of the liquid corresponding to the temperature value, the temperature of the liquid substance taken in from the first measuring device 22 in the controller can be calculated by taking the storage information S3. Processed in S4 and thereby detecting the amount of leakage in the pump S5
I do. On the other hand, the temperature of the liquid material taken in from the second measuring device 23 in the controller is processed by the calculating means S6 while taking in the stored information S3, thereby detecting the volume change amount of the liquid material in the nozzle S7. A filling amount adjustment S8 is performed so as to add or subtract the deficient charge caused by the leakage S5 and the volume change S7 and to correct an error between the calculated amount and the basic filling amount 10, and a pulse amount corresponding to the adjustment. Is adjusted S9, and the positive displacement pump 10 is rotated by the servomotor 14. In this case, the rotation angle of the servomotor is proportional to the number of pulses.

As shown in FIG. 3, in the relationship between the time T and the speed S, the main shaft of the servo motor moves as indicated by a line 50 during a predetermined time TX. That is, S1 indicates the maximum speed, and the area of the grid area surrounded by the line 50 corresponds to the filling amount. By the way, as shown in FIG. 4, in a work in which the bag 19 moving in the circular orbit in the direction of the arrow stops at the position of the pump 10 and the liquid material is successively filled with the nozzle 12, 30 bags or more per minute are required. Filling operations are not possible in time. In this case, the calculation is at most one bag for two seconds. If the calculation is performed more strictly and it takes 0.7 seconds to move the bag, the filling time into the bag becomes 1.3 seconds, and there is almost no margin. Then, in FIG. 3, the filling time TX is kept at 1.3 seconds, and the speed of the main spindle is set to S as indicated by a dotted line 51.
It is desirable to use a control method in which the speed is increased up to level 2 or, conversely, the speed is reduced below line 50.

FIG. 5 shows an example of a piston type positive displacement pump, in which a pinion 26 fixed to a main shaft 25 of a servomotor is replaced with a rack tooth 2 formed in a piston lot 27.
8, the liquid in the storage tank 31 is sucked and discharged from the nozzle 32 by the reciprocating movement of the piston 30 in the cylinder 29.

FIG. 6 is a cross-sectional view of a nozzle 34 for filling a container 33 with pure liquid, which is provided with a valve 35 for normally closing the nozzle to prevent leakage of the liquid, and the valve 35 is opened by the discharge pressure of the liquid. I do.

[0013]

According to the present invention, the amount of back leakage in the pump, which changes in accordance with the temperature change of the liquid material, and the change in the volume of the liquid material in the nozzle portion, which also changes in accordance with the temperature, are corrected collectively. Control the amount of filling with less error.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram in which each element of a device is represented by a block line.

FIG. 2 is a side view of the apparatus.

FIG. 3 is a rotation graph of the main shaft of the servo motor.

FIG. 4 is a plan view of a moving orbit of a filling container.

FIG. 5 is an embodiment diagram of a positive displacement pump.

FIG. 6 is a view showing an embodiment of a nozzle.

[Explanation of symbols]

10: Positive displacement pump 11: Storage tank 12:
Nozzle 14: Servo motor 16: Controller 19
… ‥ Bag 22… ‥ First measuring instrument 23… ‥ Second measuring instrument

Claims (2)

[Claims] An apparatus for sequentially filling a liquid substance through a positive displacement pump into containers sent at equal intervals,
The value measured by the first measuring device S1 of the temperature or the viscosity installed on the suction side of the positive displacement pump and the stored information S3 stored in advance are processed by the calculating means S4, and the leakage at the pump according to the measured value is performed. While detecting the amount S5, a second measuring device S for measuring the temperature or viscosity installed on the discharge side of the positive displacement pump.
2 and the stored information S3 stored in advance are processed by the calculating means S6 to detect the volume change amount of the liquid material S7, and also to detect the leakage amount S5 and the detected volume change amount S5.
7 is compared with the filling amount adjusting means S8 and the basic filling amount S1 is checked.
A filling method in which a drive pulse amount is set S9 from the relationship with 0, and the displacement type pump drive servomotor is rotated by a rotation amount commensurate with the drive pulse amount S9. 2. A positive displacement pump in which a storage tank is connected to a suction side and a discharge nozzle is connected to the same discharge side.
A controller for connecting an output circuit of a measuring instrument and an output circuit of a second measuring instrument for temperature or viscosity installed on the discharge side of the positive displacement pump, and the controller, which measures a value measured by the first measuring instrument. Means for processing the extracted storage information and comparing it with the calculation means to detect the amount of leakage at the pump according to the measured value, and the measured value by the second measuring device,
Means for detecting the volume change amount of the liquid material by processing the extracted stored information and the light amount calculation means, and comparing the detected leak amount and the detected volume change amount with the filling amount adjusting means and comparing the detected amount with the basic filling amount. Means for setting a driving pulse amount based on the relationship, and a servomotor for driving the positive displacement pump by a rotation amount corresponding to the driving pulse amount.