JP3507577B2 - Liquid filling amount correction method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid handled in various fields such as pharmaceuticals, industrial chemicals, cosmetics, foods, etc., when filling a container or the like while measuring a predetermined amount of the liquid. The present invention relates to a filling amount correction method and apparatus.

[0002]

2. Description of the Related Art A method such as volume filling (piston method) or weight filling is used to fill a container or the like with a liquid handled in each of the above fields. The volumetric filling is a method in which, for example, a liquid is contained in a piston cylinder, and the filling amount is measured by the movement amount of the piston to fill the liquid. The gravimetric filling is a method in which a liquid is supplied from a nozzle to a container placed on a weighing device to measure and weigh the container.

[0003]

In the case of the piston method, the piston portion and the cylinder portion are changed due to the viscosity change caused by the change of the type of the liquid to be filled and the viscosity change due to the change of the liquid temperature during the filling. The leak amount changes due to a gap or a time lag such as a check valve, so that the discharge amount per stroke of the piston is not stable and accurate filling cannot be performed. The only adjustment method of this method is the stroke adjustment of the piston, which is not suitable for fine adjustment. On the other hand, in the case of the weight type, although it is not affected by the viscosity and specific gravity as described above, it is impossible to perform accurate filling due to the contact between the filling nozzle and the container and the impact load particularly when filling a small amount. There is a point. The present invention is
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid filling amount correction method and device that solve the above problems.

[0004]

In accordance with the above-mentioned object, the present invention provides a liquid chamber that communicates with a discharge valve inside a cylinder and a cylinder inside the cylinder.
A moving plunger is provided, and the plunger is attached to the wall of the cylinder.
Form a liquid suction hole that communicates with the liquid chamber at the descending position
At the same time, at the plunger rising position
Communicates between the liquid chamber and the escape hole for discharging the liquid to the outside of the cylinder.
Make a groove and move the plunger at the middle position.
Block the suction hole and escape hole, and further
The groove is formed in the part that communicates with the escape hole side, and
Depending on the rotation angle of the slant and the plunger in the circumferential direction,
Using a piston pump that regulates the amount of protrusion,
Detecting the filling amount of the liquid at the weight checker, and feeds back the detection information to the loading of setter, via the AC servo motor by the correction signal from the setting device
The above problem is solved by a liquid filling amount correction method characterized by correcting the rotation angle of the plunger of the piston pump. Further, the present invention is in the cylinder
Plunge that slides in the fluid chamber communicating with the discharge valve and in the cylinder
Installed on the cylinder wall at the lower position of the plunger.
While forming a liquid suction hole communicating with the liquid chamber,
At the plunger's raised position, the liquid chamber and the cylinder
Form a groove that connects the escape holes that discharge the liquid to the outside, and
With the plunger at the middle position of the runner,
The escape hole is closed, and the groove of the plunger is on the escape hole side.
An inclined portion is formed in a portion communicating with the
Controls the amount of liquid delivered according to the rotation angle in the circumferential direction
Fill the container with liquid using a piston pump
A filling device for filling liquid, the piston pump
However, by connecting the drive gear to the plunger,
Adjust the liquid filling amount by linking the C servo motor.
The above problem is solved by using a liquid filling device
I decided .

[0005]

According to the method and apparatus of the present invention, the liquid can be filled into the container accurately and quickly, and the filling amount can be easily corrected.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is a Bosch type piston pump for sucking and discharging a liquid to be filled, 2 is an AC servomotor, 3 is a digital type filling amount setting device, 4 is a weight checker, 5 is a filling valve, 6 Is a conveyor for container transfer,
7 is a container on the conveyor 7 for filling the liquid. In the Bosch type piston pump 1, 11 is a cylinder, 1
Reference numeral 2 denotes a plunger (piston) that can move up and down in the cylinder 11 and can rotate. Reference numeral 13 denotes a drive gear that is interlocked with the AC servomotor 2, and is connected below the plunger 12 on the same axis. A discharge valve 14 is provided at the top of the piston pump 1, and the discharge valve 14 is connected to the container 7 via the filling valve 5 by a pipe 9. As shown in FIG. 2 (A), the piston pump 1 is provided with a liquid suction hole 11a in a cylinder 11 and a liquid escape hole 11b below a wall portion on the opposite side thereof, and a discharge valve 14a at the top as described above. Is equipped with. The suction hole 11a communicates with a liquid supply source. The outer wall of the plunger 12 in the cylinder 11 is provided with a groove 15 having a certain width in the axial direction in the vertical direction. The groove 15 expands in a fan shape from the middle to the bottom, and particularly the inclined lead 15a is formed. It is provided. Reference numeral 18 denotes a liquid chamber above the plunger 12, and the liquid chamber 18 is a liquid passage 18a.
It is connected to the discharge valve 14 via. As shown in FIG. 2A, when the plunger 12 is lowered, the suction hole 11a
A predetermined amount of liquid is sucked into the liquid chamber 18 from the discharge valve 1 as shown in FIG.
The liquid is sent out from No. 4. Then, as shown in FIG. 7C, the delivery of the liquid from the discharge valve 14 is stopped at the position where the groove 15 and the escape hole 11b are electrically connected to each other, and the stroke is invalid.

This device operates in the following manner. First, the filling amount is set by the filling amount setting device 3.
That is, when the container 7 moving in the direction of the arrow on the conveyor 6 is detected by the position detection sensor (not shown), the AC servomotor 2 is activated by the signal from the sensor, and the piston pump 1 of the piston pump 1 is passed through the drive gear 13. The filling amount is set by rotating the plunger (piston) 12 by a predetermined angle. First, when the plunger 12 is lowered, a predetermined amount of liquid is sucked into the liquid chamber 18 from the liquid supply source (not shown) through the suction hole 11a of the piston pump 1 (see FIG. 2A). Next, the filling valve 5 is opened, and the container 7 moved to a predetermined position on the conveyor 6 by the rise of the plunger 12 is filled with the liquid (see FIG. 2B). When the lead 15a of the groove 15 reaches the escape hole 11b, the liquid chamber 18 moves to the groove 1
Liquid is not delivered from the discharge valve 14 even if the plunger is lifted by being electrically connected to the escape hole 11b via 5 (see FIG. 2C). Therefore, the predetermined amount of filling is completed. That is, the liquid delivery (filling) starts when the plunger 12 rises and closes the suction hole 11a, and the plunger 12 further rises and the groove 1
The delivery of liquid ends when the lead 15a in the lower part of 5 meets the escape hole 12b. That is, the liquid chamber 18 and the escape hole 11b are formed by the groove 1
Even if the plunger 12 rises, the liquid chamber 1
The liquid of No. 8 flows out from the escape hole 11b, and therefore is not sent out from the discharge valve 14. It should be noted that FIGS. 3 and 4 show the positions of the plunger 12 at the maximum amount and the minimum amount of the liquid delivery amount (that is, the filling amount). That is, the amount of liquid delivered is regulated in accordance with the rotation angle of the plunger 12.

Next, the filled container 7 is weighed by the weight checker 4 and the signal is fed back to the filling amount setting device 3 for comparison with the filling amount set by the setting device 3. If the filling amount and the set value match or are within the tolerance, the line is moved to the acceptance line.
If there is a difference between the filling amount and the set value, remove the filled container from the line. Then, the AC of the difference signal
The plunger 12 is rotated via the servo motor 2, the rotation angle is automatically adjusted by the difference data, and the suction amount into the liquid chamber 18 is adjusted. That is, when the filling amount is larger than the set value, the groove 15 for the escape hole 11b of the cylinder 11 is formed.
In order to shorten the distance to the lead 15a, the plunger 12 is rotated in the direction of arrow N in FIG.
The distance (stroke) until the 1b and the groove 15 are electrically connected may be shortened. That is, it approaches the state of FIG. on the other hand,
When the filling amount is smaller than the set value, the plunger 12 may be rotated in the direction of arrow M in FIG. 2 to increase the distance (stroke) until the escape hole 11b and the groove 15 are electrically connected.
That is, it approaches the state of FIG.

[0009]

According to the filling apparatus of the present invention, the liquid can be filled without being affected by the contact of the nozzle or the like and the impact load, and the filling amount after the filling can be confirmed by weight. In addition, it is possible to manage the filling with a weight that is not affected by the viscosity and specific gravity of the liquid. For this reason, the defects of the volume type and the weight type can be solved at the same time, and the filling amount can be corrected very easily.

[Brief description of drawings]

FIG. 1 is a diagram conceptually explaining a method and an apparatus according to the present invention.

2A and 2B are explanatory views of the structure and operation of a piston pump used in the present invention. FIG. 2A is a suction stroke, FIG. 2B is a filling stroke, and FIG. (Sending) process.

FIG. 3 is a diagram conceptually explaining the operation of the piston pump shown in FIG. 2, showing a case where the maximum delivery amount is obtained, and FIG.
Shows the upper limit of the stroke at which the delivery of the liquid by the plunger is completed, and FIG. 7B shows the position of the first plunger at the beginning of the delivery.

4 is an explanatory diagram corresponding to FIG. 3 in the case of the minimum delivery amount,
The same figure (A) shows the upper limit of the stroke at which the delivery of the liquid by the plunger is completed, and the figure (B) shows the position of the first plunger at which the delivery is first started.

[Explanation of symbols]

1 piston pump 2 AC servo motor 3 Filling amount setting device 4 weight checkers 7 containers 11 cylinders 11a Suction hole 11b escape hole 12 Plunger 15 grooves 18 Liquid chamber

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-156403 (JP, A) JP-A-5-223627 (JP, A) JP-A-60-47886 (JP, A) JP-A-4- 18207 (JP, A) Nagai Kiyohide, Hosoda Akira, Moriyama Shinji, New / Piston Pumps and Motors and Control Valves, Hydro-Pneumatic Technology, Japan, October 2001, VOL. 40 NO. 10, 38-41 (58) Fields investigated (Int.Cl. ⁷ , DB name) G01F 11/06 B65B 3/28 F04B 9/02 F04B 13/00 G01G 17/04

Claims (3)

(57) [Claims] 1. A liquid chamber communicating with a discharge valve and a cylinder in a cylinder.
A plunger that slides in the binder is installed, and the cylinder wall
Suction of the liquid that communicates with the liquid chamber at the lowered position of the plunger
A hole is formed and the plunger
An escape hole for discharging the liquid to the liquid chamber and outside the cylinder at the raised position
Form a groove that connects the
A portion in which the suction hole and the escape hole are closed by a runner, and the groove of the plunger communicates with the escape hole side.
An inclined portion is formed on the ridge, and the inclined portion and the plunger are rotated in the circumferential direction.
The amount of liquid delivered was regulated according to the turning angle.
Using a piston pump, to detect the filling amount of the liquid at the weight checker, and feeds back the detection information to the loading of setter, via the AC servo motor by the correction signal from the setting device
A method for correcting a filling amount of a liquid, comprising: correcting a rotation angle of a plunger of the piston pump. 2. A liquid chamber communicating with the discharge valve and a cylinder in the cylinder.
A plunger that slides in the binder is installed, and the cylinder wall
Suction of the liquid that communicates with the liquid chamber at the lowered position of the plunger
A hole is formed and the plunger
An escape hole for discharging the liquid to the liquid chamber and outside the cylinder at the raised position
Form a groove that connects the
A portion in which the suction hole and the escape hole are closed by a runner, and the groove of the plunger communicates with the escape hole side.
An inclined portion is formed on the ridge, and the inclined portion and the plunger are rotated in the circumferential direction.
The amount of liquid delivered was regulated according to the turning angle.
Fill the container with a liquid using a piston pump.
The piston pump connects a drive gear to the plunger.
Contact the drive gear with the AC servo motor to fill the liquid.
Liquid filling device designed to adjust the filling amount. 3. A piston pump, a liquid filling amount setting device for driving and controlling the AC servomotor, and a weight checker which is interlocked with the setting device and detects a liquid discharge amount of the piston pump. Item 3. The liquid filling device according to item 2.