CN207145665U - A kind of guide's oil circuit controls switching valve - Google Patents

Abstract

The utility model discloses a switching valve controlled by a pilot oil circuit, which comprises a valve body, an electromagnet is arranged at one end of the valve body, a valve body end cover is arranged at the other end of the valve body, and a valve core is arranged at the middle of the valve body , one end of the spool is connected to the push rod, the other end of the spool is connected to the spring seat, the other end of the push rod is connected to the electromagnet, and the spring seat is connected to the end cover of the valve body through the return spring connection, the valve body is provided with a working oil chamber, and an oil channel and an oil passage connected to the working oil chamber are arranged on the valve body. The utility model not only has the advantages of simple structure and ingenious design, but also adopts a slide valve structure, Combining with the common slide valve structure, design the flow channel, opening position, valve body and valve stem size, etc., it has the advantages of easy replacement, low cost, high reliability, and two sets of working devices can be controlled by one set of pilot equipment.

Description

A pilot oil circuit control switching valve

technical field

The utility model relates to a pilot oil circuit control switching valve, which belongs to the technical field of engineering machinery.

Background technique

At present, with the development of the machinery industry, more and more construction machinery emerges as the times require, such as emergency manipulators, tunnel boring machines, and tunnel device installation machines. These construction machinery contain two or more mechanical arms, so in the control device How to use a set of control devices to control two or more manipulators? In terms of electromechanical control, some use electric control switching, and some use hydraulic control switching. However, among the existing control devices and control methods, the electronic control It is easy to be damaged and the reliability is not high, so the existing control methods are not perfect enough.

Utility model content

The purpose of the utility model is to: provide a simple structure, easy to operate, adopt the slide valve structure, combine with the general slide valve structure, design the flow channel, opening position, valve body and valve stem size, etc., easy to replace, low cost, A pilot oil circuit control switching valve and its working method with high reliability and capable of controlling two sets of working devices at the same time overcome the deficiencies of the prior art.

The utility model is composed as follows: a pilot oil circuit control switching valve, including a valve body, an electromagnet is arranged at one end of the valve body, a valve body end cover is arranged at the other end of the valve body, and a valve body is arranged in the middle of the valve body. One end of the spool is connected to the push rod, the other end of the spool is connected to the spring seat, the other end of the push rod is connected to the electromagnet, and the spring seat is connected to the end cover of the valve body through the return spring. A working oil chamber is arranged in the valve body, and an oil channel and an oil passage connected to the working oil chamber are arranged on the valve body.

The working oil chamber includes an A oil chamber and a B oil chamber.

The A oil chamber is connected with the connection port of the switching valve A1, the connection port of the switching valve A2 and the oil inlet port of the pump through the oil channel.

The B oil chamber is connected to the B1 connection port of the switching valve, the B2 connection port of the switching valve and the oil return tank port through the oil channel.

A friction block is arranged between the push rod and the valve body, and a positioning spring is arranged between the push rod and the valve core and between the friction block and the valve core.

A limiting boss is arranged on the spring seat.

Due to the adoption of the above technical scheme, compared with the prior art, the utility model not only has the advantages of simple structure and ingenious design, but also adopts a slide valve structure, combined with a general slide valve structure, the design of flow passage, opening position, valve body and The size of the valve stem, etc., has the advantages of easy replacement, low cost, high reliability, and the ability to control two sets of working devices at the same time.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a working principle diagram of the present utility model;

Description of reference signs: 1-electromagnet, 2-push rod, 3-friction block, 4-valve body, 5-positioning spring, 6-spool, 7-spring seat, 8-return spring, 10-valve body end Cover, 11-A oil chamber, 12-B oil chamber, 14-switching valve A1 connection port, 15-switching valve A2 connection port, 16-pump oil inlet, 17-switching valve B1 connection port, 18-switching valve B2 Connection port, 19-oil tank port, 20-first working device, 21-second working device, 22-first three-position four-way reversing valve, 23-second three-position four-way reversing valve.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

Implementation of the utility model: a pilot oil circuit control switching valve, including a valve body 4, an electromagnet 1 is arranged at one end of the valve body 4, a valve body end cover 10 is arranged at the other end of the valve body 4, and a valve body The middle part of 4 is provided with a spool 6, one end of the spool 6 is connected with the push rod 2, the other end of the spool 6 is connected with the spring seat 7, and the other end of the push rod 2 is connected with the electromagnet 1 , the spring seat 7 is connected to the valve body end cover 10 through the return spring 8, the valve body 4 is provided with a working oil chamber, and the valve body 4 is provided with an oil channel and an oil port connected to the working oil chamber.

The working oil chamber includes an A oil chamber 11 and a B oil chamber 12 .

The A oil chamber 11 is connected with the connection port 14 of the switching valve A1 , the connection port 15 of the switching valve A2 and the oil inlet port 16 of the pump through the oil channel.

The B oil chamber 12 is connected with the switching valve B1 connection port 17 , the switching valve B2 connection port 18 and the oil return tank port 19 through the oil channel.

A friction block 3 is arranged between the push rod 2 and the valve body 4 , and a positioning spring 5 is arranged at the joint between the push rod 2 and the valve core 6 and between the friction block 3 and the valve core 6 .

A limiting boss 13 is arranged on the spring seat 7 .

A working method for a pilot oil circuit control switching valve, first connecting the switching valve A1 connection port and the switching valve B1 connection port of the A oil chamber of the pilot oil circuit control switching valve to the three-position four-way reversing valve on the first working device Then connect the switching valve A2 connection port and the switching valve B2 connection port with the three-position four-way reversing valve on the second working device. When the electromagnet is not powered, the hydraulic control handle moves to the No. The pump oil enters the A oil chamber of the working oil chamber through the pump oil inlet, and then enters the control oil port a1 of the three-position four-way switching valve, controls the three-position four-way switching valve to switch to the left position, and the hydraulic cylinder of the first working device Oil enters the rod chamber, oil exits the rodless chamber, and the piston rod of the first working device retracts; the hydraulic control handle moves to the No. The piston rod of the working device is stretched out, and the oil in the B oil chamber of the hydraulic cylinder of the first working device returns to the oil tank through the oil return tank port. When the electromagnet is energized, a thrust is applied to the push rod, and the push rod pushes the valve core to move to the right. Due to the function of the limit boss, the spool moves to the corresponding position. At this time, the oil inlet port of the pump is connected with the connection port of the switch valve A2, the oil return tank port is connected with the connection port of the switch valve B2, the connection port of the switch valve A1, and the connection port of the switch valve B1 When the connecting port is blocked, the pilot control device can control the second working device, and then one set of pilot device can be used to control two sets of working devices in sequence.

The first working device and the second working device are hydraulic cylinders or hydraulic motors.

As shown in Figure 2, it is a working principle diagram of the present utility model, the first three-position four-way reversing valve 22 is connected with the first working device 20, the main pump, and the oil tank, and the second three-position four-way reversing valve 23 is connected with The second working device 21 is connected with the main pump and the oil tank. The control ports a2 and b2 of the first three-position four-way reversing valve 22 are respectively connected to the connection port of the switching valve A2 and the connection port of the switching valve B2; the control ports a1 and b1 of the second three-position four-way reversing valve 23 are respectively connected to the reversing valve Valve A1 connection port, switching valve B1 connection port. When the electromagnet in the switching valve is not energized, the working oil port of the switching valve is the connecting port of the reversing valve A1 and the connecting port of the switching valve B1. The extension or retraction of the piston rod of the first working device 21 . When the electric control switch works and the electromagnet in the switching valve is energized, the working oil port of the switching valve is the connecting port of switching valve A2 and the connecting port of switching valve B2, and the first three-position four-way reversing valve 22 can be controlled by operating the pilot device. commutation, and then control the extension or retraction of the piston rod of the second working device 22 .

Claims (6)

1. A pilot oil circuit control switching valve, including a valve body (4), characterized in that: an electromagnet (1) is arranged at one end of the valve body (4), and a valve is arranged at the other end of the valve body (4). body end cover (10), a spool (6) is arranged in the middle of the valve body (4), one end of the spool (6) is connected with the push rod (2), and the other end of the spool (6) is connected with the The spring seat (7) is connected, the other end of the push rod (2) is connected with the electromagnet (1), and the spring seat (7) is connected with the valve body end cover (10) through the return spring (8) , the valve body (4) is provided with a working oil chamber, and the valve body (4) is provided with an oil channel and an oil passage connected to the working oil chamber. 2. The pilot oil circuit control switching valve according to claim 1, characterized in that: the working oil chamber includes an A oil chamber (11) and a B oil chamber (12). 3. The pilot oil circuit control switching valve according to claim 2, characterized in that: the A oil chamber (11) is connected to the connection port (14) of the reversing valve A1 and the connection port (15) of the switching valve A2 through the oil circuit channel. ) to the pump inlet (16). 4. The pilot oil circuit control switching valve according to claim 2, characterized in that: the B oil chamber (12) is connected to the switching valve B1 connection port (17) and the switching valve B2 connection port (18) through the oil circuit channel Connect with the tank port (19). 5. The pilot oil circuit control switching valve according to claim 1, characterized in that: there is a friction block (3) between the push rod (2) and the valve body (4), and the push rod (2) and the valve body A positioning spring (5) is arranged at the joint of the core (6) and between the friction block (3) and the valve core (6). 6 . The pilot oil circuit control switching valve according to claim 1 , characterized in that: the spring seat ( 7 ) is provided with a limiting boss ( 13 ).