JP2727653B2 - Driving device for automatic multipoint pipeline switching device in liquid treatment plant - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a driving device for a multipoint pipeline automatic switching device in a liquid processing plant.

[Prior Art] In a liquid processing plant for food and medicine, it is necessary to clean and sterilize a pipe line with a cleaning liquid or steam periodically or as needed. The connection of the road is switched to supply the cleaning liquid and steam.

The automatic multipoint pipeline switching device is disclosed in, for example, Japanese Patent Publication No. 46-3530.
No. 9, JP-B-50-1089, a rocking plate with a U-shaped connecting pipe is linearly reciprocated with respect to a fixed plate with a plurality of pipes constituting a multipoint conduit. The connection between the pipelines is switched by rotating and swinging, and a fluid pressure cylinder and a swing actuator are usually used for the linear reciprocating movement and the rotating swing of the swing plate.

In the above-mentioned automatic switching device for multipoint pipelines, it is necessary to rotate the rocking plate after the rocking plate is separated from the fixed plate by the fluid pressure cylinder, but the rocking plate is driven in a direction separating from the fixed plate. Since the piston is pressed against the cylinder wall by the generated fluid pressure, there is a problem that a large torque is required for the rotation swing of the swing plate. .

[Problem to be Solved by the Invention] An object to be solved by the present invention is to provide a drive device capable of switching a pipeline with a small torque in an automatic multipoint pipeline switching device in a liquid processing plant.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a fixing plate on which a plurality of tubes constituting a multipoint conduit are mounted, and a U-shape opening facing the openings of these tubes. Rocking plate with connecting pipe of
A hydraulic cylinder and an oscillating actuator for linearly reciprocating and oscillating the oscillating plate with respect to a fixed plate, and first and second directions for individually supplying and discharging a pressurized fluid to the hydraulic cylinder and the oscillating actuator A switching valve for switching the connection of the plurality of pipelines by linear reciprocating motion and rotational oscillation of the rocking plate with respect to the fixed plate, wherein the first direction switching valve is provided. Is a center-closed type, and an opening / closing valve for communicating the pressure chamber to the outside is provided in a pressure chamber of a fluid pressure cylinder that drives the rocking plate in a direction away from the fixed plate. is there.

In addition, in order to adjust the speed of the linear reciprocating motion and the rotational swing of the swing plate, the flow rate is adjusted in each flow path that connects the first and second directional control valves with the fluid pressure cylinder and the swing actuator. A possible speed controller may be provided separately.

[Operation] When a pressure fluid is supplied to the pressure chamber on the side that drives the rocking plate in the direction away from the fixed plate by the first directional switching valve, the rocking plate connects the pipe connection by driving the fluid pressure cylinder. When the first directional control valve is returned to the neutral position after opening and the pipe connection is opened, the pressure chamber of the hydraulic cylinder is shut off from the outside, and then the fluid in the pressure chamber is discharged to the outside by the on-off valve. Therefore, the fluid pressures in the pressure chambers on both sides of the piston in the fluid pressure cylinder become equal.

In this state, when pressurized fluid is supplied from the second directional switching valve to the swing actuator, the swing actuator rotates and swings with a small torque to rotate the swing plate because no axial pressing force is applied. Move.

After the rocking motion of the rocking plate, when the first direction switching valve supplies a pressure fluid to the pressure chamber on the opposite side of the fluid pressure cylinder, the rocking plate returns and the connection of the multipoint pipeline is switched.

When the first direction switching valve is returned to the neutral position after the switching of the pipeline, the fluid pressure cylinder maintains the switching state of the multipoint pipeline by the fluid pressure supplied to the pressure chamber.

[Embodiment] FIGS. 1 to 6 show an embodiment of the present invention. This automatic multipoint pipeline switching device includes a switching unit 1 for switching pipeline connections, a driving unit 2 for driving the switching unit 1, A cleaning device 3 for cleaning the dripping of the pipeline connection portion, a seal mechanism 4 for sealing the pipeline connection portion, a leak detection device 5 for detecting leakage in the seal mechanism 4, a position detection device for detecting the position of the switching portion 1, And a driving device 7 for controlling these operations.

One end of a plurality of pipes 11a, 11b, 11c, 11d constituting a multipoint pipeline is attached to the fixed plate 10 in the switching section 1 at concentric circles and at equal intervals in the circumferential direction. The bent other ends of 11d open rearwardly in pairs, and pipes (not shown) for foods, chemicals, and the like are connected to these other ends.

An oscillating shaft 13 is mounted on a cylindrical body 12 fixed to the axial center portion of the fixed plate 10 so as to be able to reciprocate linearly and rotationally by a bearing 14, and a central portion is fixed to one end of the oscillating shaft 13. A pair of U open in the swing plate 16 facing the openings of the pipes 11a to 11d.
Connection pipes 17a and 17b each having a letter shape are attached.

The mounting plate 20a to which the cylindrical body 12 is connected, the mounting plate 20b installed at an axial distance from the mounting plate 20a, and the frame 21 connecting these plates constitute a support portion of the multipoint pipeline switching device. The fluid pressure cylinder 23 is fixed to the mounting plate 20a, and the swing actuator 24 is fixed to the mounting plate 20b. The rod 23a and the shaft 24a of the fluid pressure cylinder 23 and the swing actuator 24 that constitute the drive unit 2 slide. Key 25, parallel key 27,
The rod 23a and the swing shaft 13 are connected by a taper pin 28 so as to be able to swing and reciprocate integrally with each other.
Further, a cover 29 that covers the fluid pressure cylinder 23 is mounted on the frame body 21, and a cover 30 that covers the swing actuator 24 is mounted on the mounting plate 20b.

When the driving unit 2 supplies a pressure fluid to the fluid pressure cylinder 23, the rocking plate 16 contacts and separates from the fixed plate 10, and when the pressure fluid is supplied to the rocking actuator 24, the rocking plate 16
It rotates and swings.

The cleaning device 3 includes a coupler 33 screwed to one end of the axis of the swing shaft 13 and a plurality of nozzles 34 communicating with the coupler 33 and jetting a cleaning liquid toward a pipe connection. The cleaning liquid supplied to the coupler 33 by the omitted flexible cleaning liquid supply pipe is directed from the nozzles 34,... To the connecting portions of the pipes 11a to 11d and 17a, 17b arranged around the swinging part 13. It is jetted for a certain period of time to clean the dripping caused by the opening of the pipe connection.

The seal mechanism 4 has an L-shaped seal packing 39 in which a radially bent piece 39a is sandwiched by connecting pipes 17a, 17b and packing holders 38 screwed around these.
The connection pipes 17a, 17b and the packing holders 38 are sealed with a gasket 40, and the seal packing 39, the axially bent piece 39b of the seal packing 39, is provided at the tip with pipes 11a to 11d. And a sealing portion 41 for sealing a connection portion with the connecting portion, and a divergent taper is formed at an opening of each of the pipes 11a to 11d so as to eliminate stagnation of the liquid.

On the outer peripheral surface of the fixed plate 10, a swing plate 16 and a connecting pipe 17a,
A cover 45 covering 17b is detachably attached.

The cover 45 prevents the cleaning liquid spouted from the cleaning device 3 from scattering to the drive unit 2 in cooperation with the fixing plate 10, and when the connection between the pipes 11 a to 11 d and 17 a and 17 b is opened, the processing liquid is To prevent the connection portion from being in contact with the outside air or an operator, etc., and being contaminated by microorganisms.
a, a drain 45a is provided with a liquid collecting groove 45b for collecting a cleaning liquid or a processing liquid leaked from a pipe connection portion, and a leak detecting sensor 46 for detecting a liquid leak.

A rod 51 constituting a position detection mechanism is fixed to the swinging plate 16 on a surface facing the fixed plate 10, and stopper blocks 52, 52 to which the rod 51 abuts are fixed to the fixed plate 10, respectively. Abuts against the stopper blocks 52, 52, thereby restricting the rotational swing position of the swing plate 16. In addition, the linear reciprocating position of the swing plate 16 is set to the mounting member 54 on the fixed plate 10.
By a pair of proximity switches 55, 55 fixed by
The rotational swing position is detected by proximity switches 56, 56 (see FIG. 6) attached to the swing actuator 24, respectively. The proximity switches 55, 55 are of a completely waterproof type which does not cause any trouble even when the cleaning liquid or the like is scattered.

The driving device 7 includes a first direction switching valve 61 that supplies and discharges compressed air from an air source 60 to the fluid pressure cylinder 23, a swing actuator 24
The second directional switching valve 62 for supplying and discharging the compressed air to the outlet port of the first directional switching valve 61 and the rod 23a of the fluid pressure cylinder 23
Opening / closing valve 63 in a flow path communicating with a pressure chamber driving the swinging plate 16 in the opening direction, and a first direction in a flow path communicating an air source 60 and an inlet port of the first direction switching valve 61. A check valve 64 for preventing backflow of compressed air from the switching valve 61 to the air source 60, an on-off valve 65 for supplying cleaning water, and outlet ports and fluid pressure of the first directional switching valve 61 and the second directional switching valve 62 Speed controllers 66, 66, 67, and 67 are provided in a flow path for communicating the cylinder 23 and the oscillating actuator 24. In the first and second directional control valves 61 and 62, all ports are closed at the neutral position. It is configured as a center closed type
These valves 61-63 and 65 are program controlled by a control panel 68.

Next, the operation of the above embodiment will be described with reference to FIG.

When the solenoid 61a of the first directional control valve 61 is excited by an electric signal from the control panel 68, the rod 2 of the fluid pressure cylinder 23
3a moves to the left in the twelfth, and the swinging plate 16 is separated from the fixed plate 10.

When the proximity switch 55 confirms the separation of the swing plate 16, the solenoid 63a of the on-off valve 63 is excited and the solenoid 61a is turned on.
Is released, and the compressed air driving the fluid pressure cylinder 23 is discharged to the outside, so that the fluid pressures in the pressure chambers on both sides of the piston of the fluid pressure cylinder 23 become equal. Next, the solenoid 62a of the second directional control valve 62 is excited to swing the
When the rotary actuator 4 is rotated, the axial pressure is not applied to the fluid pressure cylinder 23, so that the swing shaft 13 and the swing plate 16 are moved about the fixed plate 10 by the small torque of the swing actuator 24. Rotate 90 degrees. Therefore, the swing actuator
24 can be made smaller.

When the proximity switch 56 confirms the rotational oscillating position of the oscillating plate 16, the excitation of the solenoid 62a is released and the second directional control valve 6 is turned off.
2 returns to the neutral position.

When the solenoid 61b of the first directional control valve 61 is excited after the return of the second directional control valve 62 to the neutral position, the fluid pressure cylinder 2
The rod 23a, swing shaft 13 and swing plate 16 of FIG. 3 move rightward in FIG. 1, and the pipeline connection portion whose connection position has been switched is closed.

After that, the solenoid 65a of the on-off valve 65 is excited and the nozzle 3
The cleaning liquid is ejected from 4, .., and the dripping caused by the opening of the pipe connection is cleaned for a specified time. The cleaning stops when the excitation is released.

After the switching of the pipeline and the cleaning of the dripping in this way, a cleaning liquid, steam, or the like is supplied from the piping connected to the pipelines 11a to 11d, and the pipeline is cleaned and sterilized.

[Effect of the Invention] The drive device of the automatic multi-point pipeline switching device in the liquid treatment plant of the present invention is for communicating the pressure chamber with a pressure chamber that drives the rocking plate in a direction away from the fixed plate to the outside. By providing the on-off valve, the fluid in the pressure chamber is discharged to the outside and the axial pressing force of the fluid pressure cylinder is eliminated, so that the torque of the swing actuator for swinging the swing plate is reduced, Can be small.

Further, the first directional control valve for supplying and discharging the pressure fluid to and from the fluid pressure cylinder is of a center closed type. Are closed, the connected state of the multipoint pipeline can be maintained even if an accident such as loss of fluid pressure occurs.

Furthermore, an adjustable speed controller is individually provided in each of the flow paths that communicate the first and second directional control valves with the fluid pressure cylinder and the swing actuator.
The linear reciprocating motion and the rotational swing speed of the swing plate can be adjusted, so that the swing plate can be stopped at a correct position.

[Brief description of the drawings]

1 is a longitudinal sectional front view of an essential part of an embodiment of the present invention, FIG. 2 is a partially cut-away side view, FIG. 3 and FIG.
FIG. 5 is an enlarged cross-sectional view of the cleaning device, and FIG. 6 is a configuration diagram of a driving device. 7 ... Drive device, 10 ... Fixed plate, 11a-11d ... Tube, 16 ... Swing plate, 17a, 17b ... Connection tube, 23 ... Fluid pressure cylinder, 24 ... Swing actuator, 61, 62: Directional switching valve, 64: On-off valve, 66, 67: Speed controller.

Continuation of front page (72) Inventor Yoshihiko Akiyama 392 Tsukiji, Fujieda-shi, Shizuoka Pref.

Claims (2)

(57) [Claims] 1. A rocking plate having a plurality of pipes constituting a multipoint conduit mounted thereon, a rocking plate having a U-shaped connecting pipe opened opposite to the openings of these pipes, and the rocking plate. A hydraulic cylinder and an oscillating actuator for linearly reciprocating and rotationally oscillating the fixed plate, and first and second directional switching valves for supplying and discharging a pressurized fluid individually to the hydraulic cylinder and the oscillating actuator. An automatic multi-point pipeline switching device in a liquid processing plant for switching connection of a plurality of pipelines by linear reciprocating motion and rotational oscillation of the rocking plate with respect to a fixed plate, wherein the first directional control valve is a center-closed type. A pressure chamber of a fluid pressure cylinder for driving the rocking plate in a direction away from the fixed plate, and an on-off valve for communicating the pressure chamber with the outside is provided. Point pipeline Drive switching device. 2. A speed controller capable of adjusting a flow rate is individually provided in each flow path for communicating the first and second directional control valves with a fluid pressure cylinder and a swing actuator. Item 2. A driving device for an automatic multipoint pipeline switching device in a liquid treatment plant according to item 1.