JPH02304278A - Driving device for multipoint pipeline automatic switching device of liquid treating plant - Google Patents

Abstract

PURPOSE:To maintain the connection of a multipoint pipeline even if an accident such as loss of the liquid pressure is happened by forming a first direction switching valve into center-closed type, and providing a switching valve communicating with the outside in a pressure chamber of a fluid pressure cylinder for driving an oscillating plate to the direction separated from a fixed plate. CONSTITUTION:A first direction switching valve 61 for supplying the pressure fluid to a fluid pressure cylinder 23 of a driving unit 2 for driving a switching unit 1 is formed into center-closed type. With this structure, after a pipeline connecting part is switched, since the first direction switching valve 61 is reset to the neutral to close all of these ports, the connection of a multipoint pipeline is maintained even if an accident such as loss of the fluid pressure is happened. A switching valve 63 communicating a pressure chamber of the fluid pressure cylinder 23 with the outside is provided in the pressure chamber of the fluid pressure cylinder 23 for driving an oscillating plate 16 to the direction separated from a fixed plate 10 to exhaust the liquid in the pressure chamber to the outside and eliminate the axial pressing force of the fluid pressure cylinder 23. Consequently, the torque of an oscillating actuator for oscillating the oscillating plate 16 is reduced to enable compactness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive device for an automatic multi-point pipe switching device in a liquid processing plant.

[Prior Art] In liquid processing plants for foods, medicines, etc., pipes need to be cleaned and sterilized with cleaning liquid, steam, etc. periodically or as needed. The connections of the pipes are changed to supply cleaning liquid and steam.

The above-mentioned multi-point pipe automatic switching device is, for example,
As shown in Publication No. 309 and Japanese Patent Publication No. 50-1089, a rocking plate with a 5U-shaped connecting pipe attached is connected to one multi-point pipe.
The connection of the pipes is switched by linearly reciprocating and rotatingly swinging a fixed plate to which a plurality of pipes are attached. A swing actuator is used.

The automatic multi-point pipe switching device requires a fluid pressure cylinder to separate the swing plate from the fixed plate and then rotate and swing the swing plate. Since the piston is pressed against the cylinder wall by the fluid pressure generated, there is a problem in that a large torque is required to rotate and oscillate the oscillating plate. .

[Problems to be Solved by the Invention] An object to be solved by the present invention is to provide a drive device that can switch pipes with small torque in a multipoint pipe automatic 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 to which a plurality of pipes constituting a multi-point conduit are attached, and a U-shaped plate that opens opposite to the openings of these pipes. A rocking plate to which a connecting pipe is attached, a fluid pressure cylinder and a rocking actuator that linearly reciprocate and rotationally rock the rocking plate with respect to a fixed plate, and a pressure fluid is separately supplied to the fluid pressure cylinder and rocking actuator. and first and second directional switching valves for supplying and discharging water, the automatic multi-point pipe system in a liquid processing plant switches the connection of a plurality of pipe lines by linear reciprocating motion and rotational rocking of the rocking plate with respect to the fixed plate. In the switching device, the first directional switching valve is of a center-closed type, and the pressure chamber of the fluid pressure cylinder that drives the rocking plate in a direction away from the fixed plate is opened and closed for communicating the pressure chamber with the outside. It is characterized by being equipped with a valve.

In addition, in order to adjust the speed of the linear reciprocating motion and rotational oscillation of the oscillation plate, a flow rate adjustment is provided in each flow path that directly connects the first and second directional switching valves to the fluid pressure cylinder and the oscillation actuator, respectively. It is advisable to provide a separate speed controller.

[Operation] When 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,
When the oscillating plate opens the pipe connection part by driving the fluid pressure cylinder and returns the first directional control valve to the neutral position after opening the pipe connection part, the pressure chamber of the fluid pressure cylinder is cut off from the outside. Next, when the fluid in the pressure chamber is discharged to the outside by the on-off valve, the fluid pressures in the pressure chambers on both sides of the piston in the fluid pressure cylinder become equal.

In this state, when pressure fluid is supplied from the second directional switching valve to the swing actuator, 1. The swing actuator rotates and swings with a small torque to rotate and swing the swing plate.

After the rocking plate rotates and swings, when pressure fluid is supplied to the pressure chamber on the opposite side of the fluid pressure cylinder by the first directional switching valve, the rocking plate returns and the connection of the multi-point pipes is switched.

When the first directional switching valve is returned to the neutral position after switching the pipelines, the fluid pressure cylinder maintains the switching state of the multipoint pipelines by the fluid pressure supplied to the pressure chamber. - [Embodiment] Figures 1 to 6 show embodiments of the present invention, and this multi-point pipe automatic switching device is used to switch connections between pipes. Part 1
．． A drive unit 2 that drives the switching unit 1. Cleaning equipment M3 for cleaning drips from pipe connections. Seal mechanism for sealing the pipe connection 4. It includes a leakage detection device 5 that detects leakage in the seal mechanism 4, a position detection device that detects the position of the switching section 1, and a drive section H7 that controls these operations.

One end of a plurality of pipes 11a, Ilb, llc, and lid constituting a multi-point conduit are attached to the fixed plate 10 in the switching part l concentrically and at equal intervals in the circumferential direction,
The bent other ends of the pipes 11a to 11d open in pairs facing each other, and pipes for food, medicine, etc. (not shown) are connected to these other end openings.

A swing shaft 13 is attached to the cylinder 12 fixed to the axial center portion of the fixed plate 10 so as to be capable of linear reciprocating motion and rotational swing by a bearing 14, and the center portion is fixed to one end of the swing shaft 13. A pair of U-shaped connecting pipes 17a are opened on the rocking plate 1B opposite to the openings of the pipes 11a to lid.

! 7b is installed.

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 pipe switching device. , the fluid pressure cylinder 23 is mounted on the mounting plate 20a, and the mounting plate'
20b, a hydraulic cylinder 23 and a rod 23a and a shaft 24 in a pressure actuator 24 are respectively fixed.
a is connected by a sliding key 25, a parallel key 27, and a coupling 26 so as to be able to integrally swing and move relatively reciprocally;
Rod 23a and swing axis! 3 are connected by a taper pin 28 so that they can swing together and move back and forth as one unit. Further, a cover 28 that covers the fluid pressure cylinder 23 is attached to the frame body 21, and a cover 30 that covers the swing actuator 24 is attached to the mounting plate 20b.

When the drive unit 2 supplies pressure fluid to the fluid pressure cylinder 23, the swing plate 16 approaches and separates from the fixed plate IO, and 4! I
When pressure fluid is supplied to the dynamic actuator 24, the rocking plate!
6 rotates and swings relative to the fixed plate 10.

The cleaning device 3 includes a coupler 33 screwed onto one end of the axis of the swing shaft 13, and a plurality of nozzles 34 communicating with the coupler 33 and spouting cleaning liquid toward the pipe connection. Cleaning liquid is supplied to the coupler 33 by a flexible cleaning liquid supply pipe (not shown) provided with . The liquid is ejected for a certain period of time toward the connection part 17b to clean drips caused by the opening of the pipe connection part.

The sealing mechanism 4 includes connecting pipes 17a, 17b and a packing holder 38 screwed onto the outer periphery of these pipes. A seal packing 39. having a cross-section shaped like a zigzag, in which a radial curved piece 39a is held between... ..., and a connecting pipe 17a.

+7b and packing holder 38. Gasket 4 between...
0,..., and the above seal gasket 33°as
The axially extending piece 39b has a sealing part 41 at the tip for sealing the connection part with the pipes 11a-1, and the pipe 11a-1
A tapered tapered end is formed at the opening of the ID to prevent liquid from stagnation.

A rocking plate 18 and a connecting pipe 1 are provided on the outer peripheral surface of the fixed plate lO.
A cover 45 covering 7a and 17b is removably attached.

The cover 45 is attached to the cleaning device 3 in cooperation with the fixing plate lO.
This prevents the cleaning liquid spouted from the drive unit 2 from scattering, and also prevents the processing liquid from scattering to the outside when the connections between the pipes 11a-1id and 17a, 17b (cy) are opened.
Furthermore, it is designed to prevent secondary contamination by microorganisms due to contact with the outside air or workers, etc., and includes a drain 45a for discharging cleaning liquid, etc. Liquid collection groove 45b that collects liquid
, and a leakage detection sensor 4B that detects liquid leakage.

On the swing plate 16, a rod 51 forming a position detection mechanism is provided on the surface facing the fixed plate lO, and on the fixed plate 10, a rod 51 is provided.
The stopper blocks 52 and 52 that the rod 51 comes into contact with are respectively fixed, and the rod 51 is in contact with the stopper blocks 52 and 52.
．． 52, the rotational swing position of the swing plate 1B is regulated. In addition, the linear reciprocating position of the m moving plate 1B is
A pair of proximity switches 55 and 55 fixed to the fixed plate lO by the mounting member 54 allow the rotational swing position to be set to 4.
Proximity switch 56 attached to the 11-movement actuator 24
．． 58 (see Figure 6).

Each is detected. Note that the proximity switches 55, 55 are of a completely waterproof type that will not cause any problem even if cleaning liquid or the like is splashed.

The drive device 7 includes a first directional switching valve 81 . A second directional valve 62 for supplying and discharging the compressed air to and from the moving actuator 24
．． Outlet port of first directional valve B1 and fluid pressure cylinder 2
An on-off valve 63. in the flow path communicates with the pressure chamber that drives the rod 23a of No. 3 in the opening direction of the rocking plate IB. air source 80
and the first directional valve 8! A check valve 64 that prevents compressed air from flowing back from the first directional valve 111 to the air source 60, and an on-off valve 85 that supplies cleaning water, in the flow path that communicates with the inlet port of the first directional valve 111. and speed controllers 8B, H in the flow path that communicates the outlet ports of the first directional switching valve 81 and the second directional switching valve 82 with the fluid pressure cylinder 23 and the swing actuator 24.

67 and θ7, and the first and second directional control valves 81 and 82 are configured as center-closed types in which all ports are closed in the neutral position.

These valves 61-B3 and 65 are program controlled by the control valve 98B.

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

The first directional valve 61 is activated by an electric signal from the control 9168.
When the solenoid 81a is excited, the fluid pressure cylinder 23
23a moves to the left in FIG.
6 is separated from the fixed plate 10.

When the proximity switch 55 confirms that the swing plate 18 is separated, the solenoid 83a of the on-off valve 63 is energized and the solenoid 81a is de-energized, and the compressed air that has driven the fluid pressure cylinder 23 is discharged to the outside.

The fluid pressures in the pressure chambers on both sides of the piston of the fluid pressure cylinder 23 become equal.Next, when the solenoid 82a of the second directional switching valve B2 is energized and the swing actuator 24 is rotated, the fluid pressure in the fluid pressure cylinder 23 is moved in the axial direction. Since no pressing force is applied, the small torque of the swing actuator 24 causes the swing shaft 13 and the swing plate IB to rotate about 90 degrees with respect to the fixed plate 10. Therefore, the oscillating 7 cutuator 2
4 can be made smaller.

When the proximity switch 56 confirms the rotational swing position of the swing plate IB, the excitation of the solenoid 82a is canceled and the second directional switching valve B2 returns to the neutral position.

After the second directional switching valve B2 returns to the neutral position, when the solenoid 81b of the first directional switching valve 61 is energized, the rod 23a of the fluid pressure cylinder 23, the @ moving shaft 13, and the swing plate 1
6 moves to the right in FIG. 1, and the pipe connection part whose connection position has been changed is closed.

Thereafter, the solenoid 85a of the on-off valve 65 is energized to open the nozzle 34.・The cleaning liquid is squirted out from the pipe to clean the dripping caused by opening the pipe connection part for a specified period of time, and the cleaning liquid is poured into the cover 45.
After a predetermined time has elapsed using a timer or the like, cleaning is stopped by de-energizing the solenoid 65a.

After switching the pipes and cleaning drippings in this way, cleaning liquid, steam, etc. are supplied from the pipes connected to the pipe Ha-lid, etc., and the pipes are cleaned and sterilized.

[Effects of the Invention] The driving device of the multi-point pipe automatic switching device in the liquid processing plant of the present invention has a pressure chamber that drives the rocking plate in the direction away from the fixed plate, in order to communicate the pressure chamber with the outside. By providing an on-off valve, the fluid in this pressure chamber is discharged to the outside and the axial pressing force of the fluid pressure cylinder is eliminated, so 4i! The torque of the swing actuator that swings the moving plate is reduced, and the size can be made smaller.

In addition, by making the first directional valve that supplies and discharges pressure fluid to and from the fluid pressure cylinder a center-closed type, after switching the pipe connection, the first directional valve returns to the neutral position and connects those ports. Since all of the pipes are closed, the connected state of the multi-point pipes can be maintained even in the event of an accident such as loss of fluid pressure.

Furthermore, by individually providing a speed controller that can adjust the rR in each flow path that communicates the Ml and the second directional switching valve with the fluid pressure cylinder and the swing actuator,
The linear reciprocating motion and rotational rocking speed of the rocking plate can be adjusted, thereby making it possible to stop the rocking plate at the correct position.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of the main part of an embodiment of the present invention, FIG. 2 is a partially cut side view, and FIGS. 3 and 4 are A of FIG. 2.
-A and BB sectional views, FIG. 5 is an enlarged sectional view of the cleaning device, and FIG. 6 is a configuration diagram of the drive device. 7. Drive device, 10. Fixed plate. 11a-1ld...pipe, 16...swing plate. 17a, 17ba ・Connection pipe, 23φ・Fluid pressure cylinder, 24・φ swing actuator. 81.82...Directional switching valve, 64...Opening/closing valve, 88.1
li7...Speed controller.

Claims (1)

[Claims] 1. A fixed plate to which a plurality of pipes constituting a multipoint pipe line are attached;
A swinging plate equipped with a U-shaped connecting pipe opening opposite the openings of these pipes, a fluid pressure cylinder and a swinging actuator that linearly reciprocate and rotationally swing the swinging plate with respect to a fixed plate. , first and second directional switching valves that individually supply and discharge pressure fluid to and from the fluid pressure cylinder and the swing actuator, and the plurality of pipelines are controlled by the linear reciprocating motion and rotational swing motion of the swing plate with respect to the fixed plate. In a multi-point pipe automatic switching device in a liquid processing plant, the first directional control valve is of a center closed type and is connected to a pressure chamber of a fluid pressure cylinder that drives the swing plate in a direction away from a fixed plate. A drive device for an automatic multi-point pipe switching device in a liquid processing plant, characterized in that the pressure chamber is provided with an on-off valve for communicating the pressure chamber with the outside. 2. According to claim 1, a speed controller capable of adjusting the flow rate is individually provided in each flow path that communicates the first and second directional switching valves with the fluid pressure cylinder and the swing actuator, respectively. A drive device for a multi-point pipe automatic switching device in the liquid processing plant described above.