JPS6139550B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-pole three-way switching device in a liquid processing apparatus such as a milk plant, and more particularly to a four-pole three-way switching device equipped with a limit device that allows positioning and confirmation of the position.

In plants that process liquid streams, such as milk plants, it is necessary to clean the processing equipment and its piping. For this reason, it has a cleaning piping in addition to the processing piping, which is appropriately switched by a piping switching device to perform liquid flow treatment and cleaning.

Japanese Patent Publication No. 35309/1984 is known as an example of such a pipe switching device. However, since this configuration has two curved conduits, switching is always performed in two positions and two directions, and single flow switching cannot be performed. In other words, regardless of whether it is necessary or not, when a necessary switch is performed, the other side will also be communicated even if it is unnecessary. For this reason, open/close valves were inserted into each pipe line that branched into four directions, and the valves were opened only in necessary directions and closed in unnecessary directions.

On the other hand, in this type of plant, there is a desire to install multiple processing equipment and sequentially clean one equipment at a time, while other equipment performs processing work, and the entire plant operates continuously. In such cases, a switching device is required that can perform independent switching at will, and can automatically close the direction in which communication is not required.

The present invention provides a switching device of this type in which a guide piston equipped with a positioning pin for positioning a rotating bend plate having a U-shaped bend for switching is actuated by pneumatic pressure within a case, and the guide piston and By facing the limit switch with a concentric limit presser via a spring,
It is an object of the present invention to provide a four-pole three-way switching device equipped with a limit device that can accurately position the bend plate for switching and confirm the position. Examples of the present invention will be described below.

In FIGS. 1 and 2, reference numeral 1 denotes a shaft, and one end of the shaft is slidably connected to an output shaft 3 of a torque actuator 2. As shown in FIG. A cylinder 4 is composed of a small diameter part 4a and a large diameter part 4b, and the small diameter part 4a supports the shaft 1 in a slidable manner. Reference numeral 5 denotes a cylinder cover which is fixed to a flange portion around the large diameter portion 4b of the cylinder 4 with bolts 6. The cylinder cover 5 is fixed on one side to the case of the torque actuator 2 by a fastener 7. 8
is a piston housed in the large diameter portion 4b of the cylinder 4, and integrally with the shaft 1 has a stroke S.
(FIG. 1) in the axial direction, the bend plate 13 can be moved toward and away from the sleeve putty 11 fixed to the other end of the cylinder 4. 9 is a release air inlet, and 10 is a tightening air inlet.

The sleeve plate is fitted onto the shaft 1 via a bush 12. The bend plate 13 is fastened to the tip of the shaft 1 with a nut 14. Reference numeral 15 denotes a gasket between the bend plate and the sleeve plate, which is fixed to the sleeve plate 11.

16 is a U-shaped bend that is opened and attached to the bend plate 13; 17 is a sleeve plate 11;
A total of four bends are installed symmetrically as shown in Figure 2. Reference numeral 18 denotes a limit device according to the present invention, which is arranged on the sleeve plate 11 with a phase shift of 90 degrees, 18a, 18b,
A total of 3 pieces of 18c are installed. 19 is a washing water receiver, and 20 is a drain pipe.

Now, referring to FIG. 3, the case 21 of the limit device 18 is fixed to the sleeve plate 11 by bolts 22. 23 is a guide piston, and a guide pin 23a coaxially attached to the tip thereof can be inserted into and removed from a guide hole 24 bored in the bend plate 13.
3a is inserted into the hole 24, the bend plate 1
3 cannot be rotated. 25 is a limit presser, and a convex portion 25 is provided facing the limit switch 26.
It has a. 27 is a spring provided between the guide piston 23 and the limit presser 25, and 28 is a spring provided between the limit presser 25 and the limit switch 26. Reference numeral 29 denotes an air port communicating with the compressed air chamber 30 on the left side of the guide piston 23. When compressed air is sent through this port, the guide piston 23 is pushed toward the right in the figure against the springs 27 and 28. Then, the guide pin 23a comes off from the guide hole 24 of the bend plate 13, and at the same time, the convex part 25a of the limit presser 25 touches the limit switch 26.
It has come to be in contact with

The operation of the switching device and limit device constructed as described above will be explained with reference to FIG. However, 17A, 17B, 17C, and 17D have four bends attached to the sleeve plate 11, and 18
A, 18b, and 18c indicate three limit devices.

(i) In the state shown in FIG. 4, the U-shaped bend 16 communicates with the bends 17A and 17B, and the
The openings C and 17D are closed by the side wall surface of the bend plate 13 and sealed by a packing 15. At this time, the limit device 18a
OFF, 18b and 18c are ON. In this state, the limit devices 18a, 18b, 18
Although all the compressed air in the air chamber 30 in the limit case c is removed, the limit device 18
The pistons 23 in the case 21 of b and 18c are turned ON because their guide pins 23a reach their peaks due to the bend plate 13, and the pistons 18a are turned on in the guide holes 24 by the action of the springs 27 and 28.
Since the guide pin 23a falls inside, it is turned off. This allows U-shaped bend 1
It can be confirmed that 6 is in communication with bends 17A and 17B.

(ii) Next, when the bend plate 13 is rotated 90 degrees in the direction of the arrow in Fig. 4, the U-shaped bend 16 becomes 17
Connects with B, 17C and rotates 180° to 17
C, communicates with 17D. To make the U-shaped bend 16 communicate with 17C and 17D from the state shown in the figure,
17C, 17 on a separate operation panel (not shown)
Turn on the switch corresponding to D. Then, compressed air is supplied to the air chambers 30 of the limit devices 18a, 18b, the piston 23 is pushed against the spring, and the limit device 18a is turned on. Therefore, all limit switches are turned on. This signal switches the air pressure in the plate removal cylinder 4 to the release air inlet 9, causing the bend plate 13 to move away from the sleeve plate 11. In this state, a rotation OK signal is output to the bend plate 13, and the plate rotates. Incidentally, since no air is contained in the compressed air chamber 30 of the case 21 of the limit device 18c, the piston of the limit device 18c remains at its peak.

Even when the bend plate 13 rotates and its guide hole 24 passes through the position of the limit device 18b, air is still being supplied to the compressed air chamber 30 of the case 21, so the piston 18b does not fall into the guide hole. Instead, it passes through that position and continues rotating. When the guide hole 24 reaches the position of 18c, air is not supplied to the limit case of 18c, so the piston of 18c naturally falls into the guide hole 24, and at the same time the piston of 18c
c is turned OFF. This signal causes the bend plate to stop rotating. At the same time, the air in the plate attachment/detachment cylinder is switched to the air inlet 10, and the bend plate 13 is pressed onto the sleeve plate 11. In this state 18a, 1
The air in the limit case 8b is removed and the rotation is completed. At this time, since 18a and 18b are ON (in the state of hitting the head) and 18c is OFF, it can be confirmed that the U-shaped bend 16 is communicating with the bends 17C and 17D.

According to the present invention, the guide pin for positioning, the guide piston integrated therewith, and the limit switch for electric control for confirming the position are arranged concentrically in the case of the limit device, so that the bend plate cannot be rotated. The switching position of the flow path can be set accurately. At the same time as the position is set, the limit switch, which is located concentrically with the guide piston integrated with the guide pin, is turned on and off by a limit holder that is moved by the action of a spring, so the switching position can be confirmed simultaneously and reliably. This makes it possible to perform accurate and safe switching control even in piping systems that require complex switching.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a four-pole three-way switching device.
FIG. 2 is a view taken along the arrow in FIG. FIG. 3 is an enlarged sectional view of the limit device. FIG. 4 is an explanatory diagram of the operation of the switching device. In the figure: 1... Shaft, 2... Actuator, 3... Output shaft, 4... Cylinder, 4a...
...Small diameter part (of the cylinder), 4b...Large diameter part (of the cylinder), 5...Cylinder cover, 6...Bolt, 7...Fixing device, 8...Piston, 9...Release air inlet, 10... ... Tightening air inlet, 11 ... Sleeve plate, 12 ... Bush, 13 ... Bend plate, 14 ... Nut, 15 ... Packing, 16 ... U-shaped bend, 17 ... Bend, 1
8...Limit device, 19...Washing water receiver, 20
... Drain pipe, 21 ... Case, 22 ... Bolt, 23 ... Guide piston, 23a ... Guide pin, 24 ... (Guide) hole, 25 ... Limit presser, 25a ... Convex part, 26 ... Limit switch, 27... spring, 28... spring, 29... air port, 30... compressed air chamber.

Claims (1)

[Claims] 1 A stepped fixed cylinder 4 having a sleeve plate 11 at one end and a small diameter part 4a and a large diameter part 4b closed by a cylinder cover 5 at the other end, a bend plate 13 at one end, and a torque actuator at the other end. By fitting a shaft 1 having a piston 8 operably connected to the output shaft 3 of the motor 2, and making the shaft 1 slidable by the piston 8 and rotatable by the output shaft 3, the bend plate 13 is freely movable toward and away from the sleeve plate 11, and the bend plate 13 has a U-shaped bend 16, and the sleeve plate 11 has a U-shaped bend 16.
In a four-pole three-way switching device in which bends 17 are opened, the sleeve plate 11 has a 90°
The limit device 18 is installed with the phase shifted by .degree., and the limit device includes a case 21 fixed to the sleeve plate 11 at one end and provided with a limit switch 26 at the other end, and a guide pin 23a located inside the case 21 at one end. By supplying compressed air to the compressed air chamber 30, the bend plate 1
A guide piston 23 is movable in the direction of exiting from a guide hole 24 provided in 3, and a guide piston 23, which is also located inside the case, is located between the guide piston 23 and the limit switch 26, and is held on both sides by springs 27 and 28. When the guide pin 23a is fitted into the guide hole 24 of the bend plate 13, the bend plate 13 is positioned, and at the same time, the springs 27 and 28 cause the limit press 25 to move away from the limit switch 26, and the positioning is completed. When the guide piston 23 is pressed against the springs 27 and 28 by feeding compressed air into the air chamber 30 and pressing the guide piston 23 against the springs 27 and 28, the guide pin 23a comes out of the guide hole 24. A four-pole three-way switching device equipped with a limit device for positioning and position confirmation.