JPS6246435B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a filling head and a filling head suitable for accurately filling a large volume at once in a so-called gravity filling and sealing machine that fills a cup with a fixed amount of liquid by the action of gravity. Regarding the filling device used.

Traditionally, Gravity filling machines have used a timer to set the filling time or a solenoid valve to control the liquid on and off, but filling accuracy has been affected due to dripping of liquid from the filling nozzle. There is a drawback that it does not appear. A rotary type filling device equipped with a multi-head filling device is available for filling a large volume in a short time with high precision, but it has the disadvantage of being large-scale and expensive. Furthermore, when filling at high temperatures, there was a problem that air bubbles were mixed into the suction pump.

A primary object of the present invention is to eliminate dripping and splashing in a liquid filling head.

A second object of the present invention is to provide a liquid filling device that eliminates dripping of liquid and can accurately fill a relatively large amount of high-temperature liquid in a short period of time.

The present invention provides a hollow nozzle body at the bottom of a hollow head body into which liquid can be introduced through a supply port, and a first and a second valve are arranged in series in the nozzle body. In the liquid filling filling head provided, a valve stem is provided in the head body and the nozzle body so as to be movable up and down, and the first valve is connected to a first valve seat formed on the inner periphery of the nozzle body and the valve stem. a first valve body movably guided by the rod;
The second valve is a second valve formed at the lower end of the nozzle body.
and a second valve body fixed to the lower end of the valve stem, and the first valve body is constantly pressed upward between the first valve body and the second valve body. A spring is provided, and the spacing between the first valve body and the second valve body and the spacing between the first valve seat and the second valve seat are adjusted to a first value.
The second valve element engages the second valve seat substantially simultaneously or slightly after the second valve element engages the first valve seat.

In the filling head configured as described above, the first valve body is always pressed upward by the spring, so when the valve stem is lowered to start filling liquid, the second valve body first moves to the second valve body. The second valve opens by moving away from the second valve seat, and at the same time or slightly later, the first valve body moves away from the first valve seat and the first valve opens.
When the valve stem is raised after liquid filling is completed, the first
the valve body engages with the first valve seat to close the first valve;
At about the same time or with a slight delay, the second valve body engages with the second valve seat and the second valve closes. In this manner, after the liquid filling is completed, the second valve closes almost simultaneously or slightly after the first valve closes, so that the liquid adhering to the inner surface of the nozzle body does not drip.

The filling device according to the present invention includes a hollow nozzle body at the bottom of a hollow head body into which liquid can be introduced through a supply port, and first and second valves are arranged in series in the nozzle body. The two valves of the filling head for liquid filling, which are arranged side by side, can be opened and closed almost simultaneously by valve stems, and the valve stems are operated by a fluid actuating device, and the actuating device is connected to a mechanical valve to supply fluid. A fluid circuit for starting and stopping the supply is connected, and the mechanical valve is configured to be operated by a cam driven by a speed reducer with a clutch brake operated by a signal from the filling seal machine and stopped by a fixed position stopping means. has been done.

In the filling device configured as described above, the operation of the fluid actuated device that opens and closes the filling head is controlled by a mechanical valve that is opened and closed by a cam that is driven by a reduction gear with a clutch brake and stopped by a fixed position stop means. In addition to its anti-drip effect, it can also fill high-temperature liquids with high speed and precision (accurate flow rate).

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire filling apparatus of this embodiment. The filling device 1 includes a filling head 2, a filling liquid supply hopper 6 of known construction connected to the filling head 2 via a flexible pipe 5, and a fluid pressure circuit connected to a fluid actuator of the filling nozzle, that is, a pneumatic cylinder. 7, and a control device 8 that controls the operation of a mechanical valve provided in the fluid pressure circuit.

In FIGS. 2 to 5, the filling head 2 is a hollow cylindrical body 2 with an inlet 21 formed in the upper part.
0, a filling nozzle 30 attached to the lower part of the main body 20, and a fluid operating device (hereinafter referred to as an air cylinder) 40 attached to the upper part of the main body 20.

Inside the main body 20 is a rod 2 that transmits the operation of the air cylinder 40 to a later-described valve provided in the filling nozzle.
2 is provided. This rod 22 is guided so as to be movable in the axial direction by a pair of guides 23 and 24 provided within the main body. A through hole 240 through which the filling liquid passes is formed through the guide 24 .
A filling liquid is supplied into a chamber 25 in the main body 20 via an inlet 21 .

The filling nozzle 30 is connected to a nozzle body 31 that is removably attached to the lower end of the body by a connector ring 27 that is screwed onto a screw 26 formed at the bottom of the body 20, and is spaced in series in the nozzle body 31 in the axial direction. First and second valves 32 arranged side by side
and 33, and a valve stem 35 that is movably guided in the axial direction by a guide 34 provided within the main body. The valve stem 35 is connected to the spring 3 provided between the guide 34 and a spring receiver 36 fixed to the upper end of the valve stem.
7, it is constantly being oppressed upwards.

The first valve 32 constitutes a liquid stop valve, and has a valve seat 321 formed on the inner periphery inside the nozzle body 31.
and a valve body 322 provided within the nozzle body 31 and movably guided by the valve stem. An O-ring seal 324 that is in close contact with the valve seat 321 is provided on the conical surface 323 of the valve body 322 . The second valve 33 constitutes a drip prevention valve, and has a valve seat 331 formed on the inner periphery of the lower end of the nozzle body 31 and a valve stem 3.
5 and a valve body 332 fixed to the lower end of the valve body 332. In this second valve, the conical surface 333 of the valve body is connected to the valve seat 3.
It directly engages with the conical inner surface of 31 to prevent dripping. A spring 335 is provided between the valve bodies 322 and 332.
is provided and presses the valve body 322 so that the upper end of the valve body 322 comes into contact with a stopper 38 fixed to the valve stem. A seal member 39 is provided on the outer periphery of the valve stem 35 to prevent liquid leakage between the valve body 322 and the valve stem.
a, 39b are provided.

The air cylinder 40 includes a cylinder main body 41 which is removably attached to the upper end of the main body 20 via a connecting member 28, and a cylinder main body 4.
1, a piston rod 43 fixed to the piston 42 and extending axially through the cylinder body, and a piston 42 provided in the cylinder chamber 44b.
and a spring 45 which urges the piston rod 43 to the upper end position. piston rod 43
A pair of stroke adjustment screws 46 are attached to the screw 430 at the upper end (projecting outside the cylinder body).
a and 46b are screwed together. The lower end of the piston rod is connected to the upper end of the rod 22 via a connector 49.

When no air pressure is supplied to the chamber 44a of the air cylinder 40 in the filling head, the piston 42 and the piston rod 43 are raised by the spring 45 and/or the air pressure acting in the chamber 44b, and therefore the rod 22 is also raised. Ru. Therefore, the O-ring seal 324 of the body 322 engages the valve seat 321 and the conical outer surface 333 of the valve body 332 sealingly engages the valve seat 331, and the first and second valves are closed.

Next, when a predetermined air pressure is supplied from the supply/discharge port 48a to the chamber 44a, the piston 42 and piston rod 43 descend, pushing down the valve stem 35 via the rod 22, pushing down the valve bodies 332, 322, and moving the first
and opening the second valve.

When the piston is in the raised position, the lower end of the rod and the upper end of the valve stem are slightly spaced to prevent the valve body 332 from separating from the valve seat 331 due to the piston, piston rod, etc. preventing the valve stem from rising. They are starting to move away from each other. Also, the valve body 32
In order to prevent the second O-ring seal 324 and the valve seat from completely disengaging, the lower surface of the stopper 38 is slightly separated from the upper end surface of the valve stem (the surface that contacts the stopper).

Since the filling liquid supply hopper 6 has a known structure in which the liquid level is always maintained at a constant level by a liquid level control device, a detailed explanation of its structure and operation will be omitted.

The air pressure supply circuit 7 includes a speed control device 72, a solenoid valve 73, a mechanical valve 74, and a pressure reducing valve 75 each having a known structure and connected in series by a conduit 71 between the supply/discharge port 48a of the air cylinder and the air pressure source 70. , supply/discharge port 48b and air pressure source 7
0 and a speed control device 77 and a pressure reducing valve 78 connected by a conduit 76.

The electromagnetic valve 73 is used for filling containers r transferred by a conveyor.
It is designed to operate in response to a signal indicating the presence or absence of a container r, and is always open when a container r is being sent on the conveyor, and is closed when no containers are being sent.

The mechanical valve opens and closes by mechanically operating the valve stem 741.

The pressure reducing valve 75 reduces the air pressure of the air pressure source 70 to approximately 4.5
The pressure is reduced to Kg/cm ² , and the pressure reducing valve 78 is designed to reduce the pressure to approximately 1.5 Kg/cm ² .

The control device 8 includes a reduction gear 80, a clutch brake 81 of a known structure connected to an input shaft 801 of the reduction gear, and a motor 8 connected to the clutch brake 81 by a chain or a timing belt.
2, and a chain 84 on the output shaft 802 of the reducer 80.
The camshaft 85 is connected to the camshaft 85 and is rotated through the reducer, and the cam 8 is fixed to the camshaft 85.
6.

A position display plate 87 is fixed to the cam shaft 85 in a constant positional relationship with the contour curve of the cam 86, and the position display plate 87 is detected by, for example, a photoelectric or magnetic proximity switch 88. It is beginning to emit a signal.

The clutch brake 81 engages upon receiving a filling signal from the filling and sealing machine, transmits the rotation of the motor to the input shaft 801 of the transmission, and transmits the position signal of the camshaft in accordance with the position signal of the display board sent from the proximity switch 88. The input shaft is detached from the input shaft and stops the rotation of the input shaft by the motor.

The mechanical valve 74 is configured such that the tip of a valve stem 741 engages with the outer periphery of a cam, and is switched by the cam.

Next, the operation of the filling device will be explained.

The motor 82 is always rotated at a constant speed. When a filling signal is sent from the filling and sealing machine to the clutch brake 81, the clutch brake 81 is engaged and the input shaft 801 of the reducer starts to rotate, and the camshaft 85 and cam 86 start to rotate via the reducer. When the valve stem 741 of the mechanical valve 74 is pushed by the cam, the valve opens and air pressure is supplied to the input port 48a of the air cylinder 40. Therefore, the piston 42 and the piston rod 43 descend, pushing down the valve stem 35 via the rod, opening the first and second valves, and filling the container r with the filling liquid begins.

When the cam rotates for a certain period of time (angle) and the pressure on the valve rod 741 is released, the mechanical valve 74 is switched and the supply of air pressure to the supply/discharge port 48a of the air cylinder 40 is stopped. Therefore, the piston 42
and piston rod 43 are spring and/or chamber 4
The pressure inside 4b increases, and the rod 22 also rises. Therefore, the valve stem 35 is raised by the action of the spring 37, and first the first valve 32 is closed, and then the second valve, that is, the anti-drip valve is closed. Therefore, it is possible to prevent the liquid adhering to the inner surface of the nozzle body from dripping. Also, when the valve is closed, the passage narrows and the fluid splashes out with force, but since it is inside the cylinder, it does not splash out.

Thereafter, the filling operation is repeated in the same manner to fill the container r with a certain amount of liquid.

The filling device of the above embodiment uses a combination of a clutch brake and a cam to avoid variation in the response speed of the clutch brake, and sets the operating position by the cam so that the mechanical valve operates within a completely accurate operating range. Therefore, the opening time of the two valves of the filling head and therefore the filling time can be set accurately, and the filling accuracy can be high (within ±1% in experiments).

Moreover, since it is not a suction pump type, there is no air bubbles mixed in, and relatively large containers can be filled with high precision.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a liquid filling device according to the present invention, FIG. 2 is a sectional view of a filling head, FIG. 3 is an enlarged sectional view of a filling nozzle of the filling head, and FIG. 4 is a valve of a first valve. 5 is a perspective view of the second valve body, FIG. 6 is a sectional view of the fluid actuated device, and FIG. 7 is a diagram showing the relationship between clutch brake operation and filling time. 1: Filling device, 2: Filling head, 20: Main body,
30: Filling nozzle, 31: Nozzle body, 32: First valve, 33: Second valve, 40: Fluid actuation device,
6: Supply hopper, 7: Fluid circuit, 8: Control device,
80: Reducer, 81: Clutch brake, 86:
cam.

Claims (1)

[Claims] 1. A hollow nozzle body is provided at the bottom of a hollow head body into which liquid can be introduced through a supply port, and first and second valves are disposed within the nozzle body. In a filling head for liquid filling arranged in series, a valve rod is provided in the head body and the nozzle body so as to be movable up and down, and the first valve is connected to a first valve seat formed on the inner periphery of the nozzle body. and a first valve body movably guided by the valve stem, and the second valve is configured by a second valve seat formed at the lower end of the nozzle body and fixed to the lower end of the valve stem. Consisting of a second valve body,
A spring is provided between the first valve body and the second valve body to constantly press the first valve body upward, and the distance between the first valve body and the second valve body is and a spacing between the first valve seat and the second valve seat such that the second valve disc engages the second valve seat at about the same time or slightly after the first valve disc engages the first valve seat. A filling head for liquid filling, characterized in that the filling head is adapted to engage a valve seat of a liquid filling head. 2. A filling head for filling liquid in which first and second valves are arranged in series in a hollow head main body into which liquid can be introduced through a supply port.
These two valves can be opened and closed almost simultaneously using valve stems, and the valve stems are operated by a fluid actuator, and a fluid circuit is connected to the actuator to start and stop the supply of fluid using a mechanical valve. A filling device characterized in that the mechanical valve is operated by a cam driven by a speed reducer with a clutch brake operated by a signal from a filling and sealing machine and stopped by fixed position stopping means.