WO2002023049A1

WO2002023049A1 - Sequence control circuit

Info

Publication number: WO2002023049A1
Application number: PCT/JP2001/001623
Authority: WO
Inventors: Toshikazu Inoue; Katsuharu Gonmori
Original assignee: Shin Caterpillar Mitsubishi Ltd.
Priority date: 2000-09-13
Filing date: 2001-03-02
Publication date: 2002-03-21
Also published as: JP3542953B2; JP2002089514A

Abstract

A plurality of fluid pressure cylinders (32, 33) are connected in parallel between one output port (19) and the other output port (20) of a changeover valve (15) which directionally controls a working fluid fed from a fluid pressure pump (12). A pilot check valve (34), together with the fluid pressure cylinder (32), is connected in parallel to the output port (19) of the changeover valve (15). A pilot signal pressure delivered from the fluid pressure cylinder (32) by the extending operation of the fluid pressure cylinder (32) actuates the check valve (34) for communication so as to feed working fluid to the fluid pressure cylinder (33). A pilot check valve (36), together with the fluid pressure cylinder (33), is connected in parallel to the output port (20) of the changeover valve (15). A pilot signal pressure delivered from the fluid pressure cylinder (33) by the contracting operation of the fluid pressure cylinder (33) actuates the check valve (36) for communication so as to feed working fluid to the fluid pressure cylinder (32).

Description

Light

Sequence control circuit

Technical field

The present invention relates to a sequence control circuit for controlling a plurality of fluid pressure cylinders by fluid pressure. Rice field

Background technology

In a year when the demand for widening construction was increasing, a two-stage expansion and contraction screw device as shown in Japanese Patent No. 2656621 was installed. Is it a default financing?

As shown in FIG. 3, this fast drive finisher includes a main thread 2 connected to the rear of the pavement machine body 1 and a main thread 2 as shown in FIG. A left and right two-stage expansion and contraction screw device 3 movably attached to the rear of the main screw of the pavement machine. -The pavement material received by the horn 4 is conveyed to the rear part by the bar conveyor 5 and dropped onto the pavement to be screwed down. After spreading in the lateral direction in step 6, while paving forward, pave the paving material to the specified width t using the main screw 2 and the two-stage stretching screw device 3. .

The left and right two-stage expansion and contraction device 3 is located at the first stage behind the main thread 2 and parallel to the main thread 2. The expansion and contraction threads 3a are arranged, and the first-stage expansion and contraction threads 3a are respectively provided by the first hydraulic cylinder 7. It is moved horizontally to the left and right. In addition, after these first-stage expansion and contraction threads 3a, the second-stage expansion and contraction threads 3b are parallel to these. These second-stage expansion / contraction threads 3b are horizontally moved left and right by the second hydraulic cylinders 8, respectively.

During transportation of the pavement machine, the hydraulic cylinders 78 of the first and second stages of the telescopic scrolls 3a and 3b are operated by their respective pistons. O Retract the thread of the stone to fit both extension and contraction screws 3a and 3b within the width of the main screw 2.

During the pavement work, the first and second stages of expansion and contraction threads 3a and 3b are spread according to the width of the pavement. In other words, when the piston rod of the first hydraulic cylinder 7 is fully extended, the first-stage expansion and contraction thread 3a becomes full. If it is desired to further increase the pavement width, the piston rod of the second hydraulic cylinder 8 should be removed from this state. By expanding, the second-stage expansion and contraction thread 3b is expanded. In this way, a width that is at least twice the main width is obtained.

As described above, the two-stage expansion / contraction screw device 3 is provided with the hydraulic cylinders 7 and 8 in both the two stages. The hydraulic cylinders 7 and 8 of the second-stage expansion and contraction threads 3a and 3b do not need to operate simultaneously in the second-stage. Therefore, conventionally, two solenoid-operated directional control valves provided in a series for controlling cylinder hydraulic oil in a direction, and these solenoid-operated switching valves are provided. The operation is controlled by two operation switches for operating the switching valves, respectively.

Also, in the construction of general roads, especially at sites where there are obstacles such as telephone poles and manholes on the shoulders of the road, frequent thread expansion and contraction work is necessary. It may be necessary. However, this two-stage expansion / contraction screw device 3 needs to determine which of the two-stage expansion / contraction screws 3a and 3b is to be operated. As a result, the work in the evenings has become complicated.

As described above, conventionally, each of the plurality of hydraulic cylinders is individually operated by a plurality of operation switches for controlling the expansion and contraction operations of the respective cylinders. In addition to the need for switching valves, there is a problem that their operation is complicated.

The present invention has been made in view of such a point, and the expansion and contraction operations of a plurality of fluid pressure cylinders can be easily controlled by a single switching valve. The purpose is to be able to work. Disclosure of the invention

The sequence control circuit of the present invention has one and the other output ports for controlling the working fluid supplied from the fluid pressure pump in the direction. And a plurality of sequentially operated hydraulic cylinders connected in parallel between one output port of the switching valve and the other output port of the switching valve. , Motion Due to the fixed stroke operation of the fluid cylinder at the top of the working order, it depends on the no-mouth signal pressure output from the fluid cylinder. And a plurality of nozzle port operation check valves for supplying working fluid to the fluid pressure cylinder having a lower operation order and being operated in communication with each other. As a result, when the fluid cylinder in the higher operating order performs a certain stroke operation due to the switching of the switching valve, the fluid is output from the fluid cylinder. The non-rotating check valve operates in communication by the neurot signal pressure, and the fluid pressure cylinder, which is relatively lower in the operating order, operates. In addition, the operation of a plurality of fluid pressure cylinders can be easily sequence-controlled by one switching valve.

A plurality of fluid pressure cylinders are provided with one fluid pressure cylinder and another fluid pressure cylinder, and a plurality of the non-rotating check valves are switched. One fluid pressure cylinder is connected in parallel with one fluid pressure cylinder to one output port of the valve, and one fluid pressure cylinder is operated by a constant stroke operation. The communication port is operated by the signal output from the fluid pressure cylinder output from one of the fluid pressure cylinders, and one of the output ports is connected to the other fluid pressure cylinder. One pipe port for supplying the working fluid is connected in parallel with the other fluid pressure cylinder to the other output port of the check valve and the switching valve. Nozzle output from another hydraulic cylinder due to a certain stroke operation of one hydraulic cylinder Subjected work dynamic fluid No. is by Ri communicating operation pressure to the fluid pressure Shi Li down Da of the output port or found one other side It is equipped with another non-rotating check valve to be supplied. The stroke of the one pipe opening check valve is operated by the noise signal pressure output from the one fluid pressure cylinder that activated the stroke of the cylinder. Then, when the other hydraulic cylinder can be operated, and when the switching valve is set to the other switching position and the other hydraulic cylinder is operated in the opposite direction, a certain amount of pressure can be obtained. The other pilot operated check valve is operated in communication with the signal from the nozzle port output from the other fluid pressure cylinder that has operated the stroke. Therefore, one fluid cylinder and the other fluid can be operated in the opposite direction, so that one fluid cylinder and the other fluid can be operated. Shi you to re-down da of expansion and contraction operation of the by Ri briefly over Ke emissions controls in one of the switching valve o

The switching valve is an electromagnetic switching valve that can be switched by an electric signal input from the operation switch, and is operated by one operation switch. By simply switching one of the electromagnetic switching valves, a plurality of fluid pressure cylinders can be easily controlled and the operation can be facilitated.

The first hydraulic cylinder and the other hydraulic cylinder are the first stage of a two-stage telescopic screw device in a fast-finisher. Hydraulic cylinder that expands and contracts the expansion and contraction screw of the second stage and the expansion and contraction screw of the second stage, respectively, and only operates one switching valve. And a two-stage telescopic screen in a fast-finish closure. The expansion and contraction threads of the device can be expanded in the order of the first stage and the second stage, and can be stored in the order of the second stage and the first stage. Brief description of the drawing that facilitates the work of the operator who operates the expansion and contraction thread of the two-stage expansion and contraction device

FIG. 1 is a circuit diagram showing an embodiment of a sequence control circuit according to the present invention. FIG. 2 is a circuit diagram showing a sequence control circuit according to the present invention. FIG. 3 is a circuit diagram showing another embodiment of the control circuit, and FIG. 3 is a plan view showing an asphalt finisher. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, one embodiment of the present invention will be described with reference to FIG. 1, and another embodiment will be described with reference to FIG. In this embodiment, a hydraulic circuit using working fluid as working oil is shown as an example. The hydraulic pump is an hydraulic pump, and the hydraulic cylinder is a hydraulic cylinder. It is a hydraulic cylinder.

FIG. 1 shows an example of a sequence control circuit. The suction port of the fluid pressure pump 12 is connected to the tank 11, and the fluid pressure pump 1 is connected to the tank 11. A discharge passage 13 connected to the discharge port 2 is provided with a relief valve 14 for maintaining a pump discharge pressure at a set pressure.

The discharge passage 13 is supplied from the fluid pressure pump 12 The switching valve 15 for controlling the working fluid in the direction is provided. The switching valve 15 is connected to the supply port 16 and the tank 11 to which the discharge passage 13 is connected. A three-position, four-port switching valve having a discharge port 18, one output port 19, and the other output port 20 connected via a connection passage 17. .

Further, the switching valve 15 is an electromagnetic switch that can be bidirectionally operated by an electric signal input from the operation switch 21 to the solenoids 22 and 23. When the operation switch 21 is switched to the A side, the electromagnetic switching valve 15 is switched to one of the switching positions a, and the operation switch is also operated. When the switch 21 is switched to the B side, the electromagnetic switching valve 15 can be switched to the other switching position b.

A passage 24, 25, 26, 27, 28, 29, 30, 31 is provided between one output port 19 of the switching valve 15 and the other output port 20, in order. A plurality of hydraulic cylinders 32 and 33 to be operated next are connected in parallel.

During the cylinder extension operation, the fluid pressure cylinder 32 is connected to the fluid pressure cylinder in the upper operation order, and the fluid pressure cylinder 33 is connected to the fluid pressure cylinder in the lower operation order. In addition, during the cylinder contraction operation, the fluid pressure cylinder 33 is the fluid pressure cylinder having the higher operation order, and the fluid pressure cylinder 32 is the fluid pressure cylinder having the lower operation order. Become a cylinder.

One of the output ports 19 of the switching valve 15 is connected to one of the nozzle opening check valves 34 together with one of the fluid pressure cylinders 32 in parallel. Yes. This one pilot operation check The valve 34 is moved from the one hydraulic cylinder 32 to the nozzle passage 35 by the constant stroke operation of the one hydraulic cylinder 32. The working fluid is operated by the output signal signal of the nozzle, and the working fluid is supplied from one output port 19 to the other fluid pressure cylinder 33. It is something.

The other output port 20 on the other side of the switching valve 15 is connected in parallel with the other hydraulic operation check valve 36 together with the other fluid pressure cylinder 33. It is connected . The other non-rotating operation check valve 36 is connected to the other hydraulic cylinder 33 by a certain stroke operation of the other hydraulic cylinder 33. 3 3 to no. The communication is performed by the neurot signal pressure output through the pilot passage 37, and one fluid pressure cylinder is connected to the other output port 20 from the other output port 20. Next, the operation of the embodiment shown in FIG. 1 will be described.

When the operation switch 21 is operated to the A side to switch the switching valve 15 from the illustrated neutral position to the one switching position a, one of the output ports Working fluid is supplied to the head side of one fluid pressure cylinder 32 from port 19, and one fluid pressure cylinder 32 moves in the extension direction. The piston 32 operates at a constant stroke indicated by the two-dot chain line.

As a result, one of the fluid pressure cylinders 32 to 32 is connected. The neuron signal pressure is output to the orifice passage 35, and the one or more nil port operation check valve 34 is generated by the norode signal pressure. In operation, the other fluid from one output port 19 is The working fluid is supplied to the head side of the pressure cylinder 33, and the other fluid pressure cylinder 33 operates in the extension direction.

Also, when the operation switch 21 is operated to the B side to switch the switching valve 15 to the other switching position b, the other output port 20 outputs another fluid pressure switch. The working fluid is supplied to the rod side of the cylinder 3 3, and the other fluid pressure cylinder 3 3 operates in the reverse direction, that is, in the contraction direction, and the piston 3 rotates. 3a operates a certain stroke indicated by a two-dot chain line.

As a result, the noise signal pressure is output from the other fluid pressure cylinder 33 to the nozzle port passage 37, and the noise port signal pressure is reduced to the noise port signal pressure. Further, the other nozzle port operation check valve 36 is operated to communicate with the other output port 20, and the working fluid is supplied to the rod side of one fluid pressure cylinder 32 from the other output port 20. Is supplied, and the one hydraulic cylinder 32 operates in the reverse direction, that is, the contraction direction.

One hydraulic cylinder 32 and another hydraulic cylinder 33 in such a sequence control circuit is shown in FIG. The first-stage telescopic screw 3a and the second-stage telescopic screw of the two-stage telescopic screw device 3 in the flat finisher The lead 3b is applied to the hydraulic cylinders 7 and 8 which extend and retract, respectively.

That is, the first-stage telescopic screw 3a is extended and contracted by one fluid pressure cylinder 32, and the second-stage telescopic screw 3a is operated. The valve 3b is extended and retracted by another fluid pressure cylinder 33. In this case, the two-stage expansion and contraction screw device 3 is expanded in the order of the fluid stage cylinder 32 of the first stage and the fluid pressure cylinder 33 of the second stage. To expand in the order of the first-stage expansion and contraction thread 3a, the second-stage expansion and contraction thread 3b, and the second-stage hydraulic pressure cylinder. , The contraction in the order of the first stage fluid pressure cylinder 32, the second stage expansion and contraction thread 3 b, and the first stage expansion and contraction thread Store in the order of 3a.

In normal construction, it is necessary for the two-stage expansion and contraction device 3 to expand only the second-stage expansion and contraction screw 3b. Therefore, such a sequence operation is sufficient.

Thus, a plurality of the pilot operated check valves 34, 36 and the passages 26, 27 30, 31, 31, 35, 37 for these pilot operated check valves are provided. This is a circuit in which expansion and contraction operations of a plurality of fluid pressure cylinders 32 and 33 are sequence-controlled by a single electromagnetic switching valve 15. Therefore, by simply switching one electromagnetic switching valve 15 with one operating switch 21, the expansion and contraction of the plurality of fluid pressure cylinders 32 and 33 can be easily performed. Control.

In other words, the first-stage expansion / decompression thread 3a and the second-stage expansion / contraction thread 3b of the two-stage expansion / contraction thread device 3 are replaced by 1 It can be easily operated with only one electromagnetic switching valve 15 and operation switch 21, and the operation of these expansion and contraction threads 3 a and 3 b is possible. Lay evening work is easy become .

Next, FIG. 2 shows another embodiment. The same parts as those in the embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.

A switching valve for controlling the working fluid supplied from a fluid pressure pump (not shown) in one direction and having the other output ports 19 and 20 in the other direction. And a plurality of hydraulic cylinders 32, 33, 33 connected in parallel between the output port 19 on one side of the switching valve 15 and the output port 20 on the other side. 41, and by the constant stroke operation of the fluid cylinder with the highest operating order, the noise signal pressure output from the fluid cylinder And a plurality of pipe-port operation check valves 34, 36, 42, 43 for supplying working fluid to the fluid pressure cylinders which are in communication with each other and which are lower in the operation order. -This is a case control circuit.

Between the fluid pressure cylinder 33 and the non-rotating check valve 42, a non-rotating passage 44 is provided, and the fluid pressure cylinder 41 and the non-rotating cylinder are connected to each other. A neurotte passage 45 is provided between the air inlet and outlet check valve 43.

The operation order during the cylinder extension operation is the order of the fluid pressure cylinder 32, the fluid pressure cylinder 33, and the fluid pressure cylinder 41. The operation order during the contraction operation is the order of the fluid pressure cylinder 41, the fluid pressure cylinder 33, and the fluid pressure cylinder 32.

Then, the switching valve 15 is switched to one of the switching positions a. When working fluid is supplied from one of the output ports 19 to the fluid pressure cylinder 32 in the higher operation order, the fluid pressure cylinder 32 extends in the extending direction. At the same time when a certain stroke operation is performed, the hydraulic cylinder 32 and the pilot passage 35 are connected. The pilot signal pressure is output, and the nozzle port operation check valve 34 communicates with the pilot signal pressure to cause one of the output ports to operate. The working fluid is supplied to the fluid cylinder 3 3, which is relatively lower in the operation order from the port 19, and the fluid cylinder 33 operates in the extension direction. .

Further, at the same time that the hydraulic cylinder 33 operates at a constant storage pressure, the hydraulic cylinder 33 and the pilot passage 4 extend from the hydraulic cylinder 33 at the same time. A pilot signal pressure is output to 4 and the pilot operation check valve 42 is operatively connected to the pilot signal by the pilot signal pressure. The working fluid is supplied from the output port 19 of the hydraulic cylinder 41 relative to the lower working order relative to the working port, and the hydraulic cylinder 41 extends the working cylinder. , The switching valve 15 is switched to the other switching position b, and the operating flow from the other output port 20 to the fluid pressure cylinder 41 is changed. When the body is supplied, the fluid pressure cylinder 41 operates in the reverse direction, that is, in the contraction direction, and at the same time when a certain stroke operation is performed. , This fluid Shea is re-down da 4 1 or et al Roh A B Uz door passage 45 to Roh ^1? I opening Tsu door signal pressure is output, Pa Ri by the Roh I opening Tsu door signal pressure of this A B Tsu door Operation The check valve 4 3 is operated to communicate, and the fluid pressure cylinder is connected from the other output port 20. The working fluid is supplied to 33, and the fluid pressure cylinder 33 operates in the reverse direction, that is, in the contraction direction.

Furthermore, at the same time that the hydraulic cylinder 33 operates at a certain stroke, the hydraulic cylinder 33 and the pilot passage 37 extend from the hydraulic cylinder 33 at the same time. The neurot signal pressure is output to this pin. The pilot operation check valve 36 communicates with the pilot signal pressure according to the pilot signal pressure, and the working fluid is supplied to the fluid pressure cylinder 32 relatively lower in the operation order. This fluid pressure cylinder 32 operates in the contraction direction.

The switching valve 15 is an electromagnetic switching valve that can be switched by an electric signal input from the operation switch 21 similarly to the one shown in FIG. By simply switching one electromagnetic switching valve 15 with one operating switch 21, a plurality of hydraulic cylinders 32, 33, and 41 can be operated. The expansion and contraction operation can be sequence controlled.

As described above, the circuit shown in FIGS. 1 and 2 is a pilot operated non-return valve 34, 36, 36 as an alternative to an electromagnetic switching valve. Since simple hydraulic sequence control using 42, 43 is used, that is, electric control using complex switches, etc., or complicated electronic control Since no static control is required, reliability is guaranteed, and no major design changes are required, making practical application easy.

Potential for industrial use This control circuit can be applied to the pneumatic circuit. The hydraulic pump 12 and the hydraulic cylinders 32, 33, 41 are used for the pneumatic pump and pneumatic circuit. A cylinder may be used.

Claims

1 & Scope of request

1. A switching valve that has one and the other output ports for controlling the working fluid supplied from the fluid pressure pump in one direction, and

Chief

A plurality of sequentially operated fluid pressure cylinders connected in parallel between one output port of the switching valve and the other output port;

By the fixed stroke operation of the upper fluid pressure cylinder in the operation order, it is connected by the signal pressure output from the fluid cylinder. And a plurality of nozzles that supply working fluid to the fluid cylinder below 1A

Sequence control circuit characterized by having

2. The multiple hydraulic cylinders

With a hydraulic cylinder and other hydraulic cylinders

Multiple pilot operated check valves are

One of the output ports of the switching valve is connected in parallel with one of the hydraulic cylinders, and one of the hydraulic cylinders has one of the strokes. The fluid is operated by the noise signal pressure output from the fluid pressure cylinder, and the working fluid flows from one output port to the other fluid pressure cylinder. A pipe-operated check valve that supplies

Connect another hydraulic cylinder to the other output port of the switching valve. A pilot signal connected in parallel with the other and output from the other hydraulic cylinder by a certain stroke operation of the other hydraulic cylinder And another pilot operated check valve that is operated by pressure to supply working fluid from one output port to the other fluid pressure cylinder.

A sequence control circuit according to claim 1, wherein the sequence control circuit is characterized by having the following.

3. The directional control valve is an electromagnetic directional control valve that can be switched by an electric signal input from the operation switch.

A sequence control circuit as set forth in Paragraph 1 or Paragraph 2 of the claim characterized by this.

4. One fluid cylinder and the other fluid cylinder

The first and second expansion and contraction threads of the two-stage expansion and scrolling device in the assorted finisher Hydraulic cylinders that extend and retract the fluid respectively

A sequence control circuit as set forth in Paragraph 2 or Paragraph 3 of the claim characterized by this.