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CN-224229325-U - Pilot-operated back pressure switching valve

CN224229325UCN 224229325 UCN224229325 UCN 224229325UCN-224229325-U

Abstract

The utility model relates to the technical field of valve bodies, in particular to a pilot-operated back pressure switching valve which comprises a main valve assembly, a pilot valve assembly and a connector assembly, wherein the pilot valve assembly and the connector assembly are positioned at the front end of the main valve assembly, the connector assembly is used for supplying power to the pilot valve assembly, the pilot valve assembly is used for controlling the main valve assembly to work according to a power-off state, the main valve assembly comprises a front cover, a rear cover, a valve body, a valve rod, a first piston, a second piston, a spacer bush and a return spring, the front cover is positioned between the front end of the valve body and the pilot valve assembly, the rear cover is arranged at the rear end of the valve body, the valve rod is arranged in the valve body, the first piston is arranged between the end of the valve rod in an abutting mode, one end of the second piston is in an abutting mode, the spacer bush is arranged between the valve body and the rear cover, the return spring is sleeved outside the second piston, two ends of the return spring are respectively in abutting mode with the rear cover and the other end of the second piston, and the two output modes of back pressure and no back pressure can be realized, so that the requirements of various expected functions can be met, the use cost is low, and the installation is convenient.

Inventors

  • Li Yuezu
  • TANG YI
  • CHEN LIMIN
  • QIU JIE
  • Shen Tiezhu
  • Cao Erxia

Assignees

  • 常州恒立气动科技有限公司

Dates

Publication Date
20260512
Application Date
20250627

Claims (10)

  1. 1. The pilot-operated back pressure switching valve is characterized by comprising a main valve assembly (10), a pilot valve assembly (20) and a connector assembly (30), wherein the pilot valve assembly (20) and the connector assembly (30) are positioned at the front end of the main valve assembly (10), the connector assembly (30) is used for supplying power to the pilot valve assembly (20), and the pilot valve assembly (20) is used for controlling the main valve assembly (10) to work according to a power-on and power-off state; the main valve assembly (10) comprises a front cover (11), a rear cover (12), a valve body (13), a valve rod (14), a first piston (15), a second piston (16), a spacer (17) and a return spring (18), wherein the front cover (11) is positioned between the front end of the valve body (13) and the pilot valve assembly (20), the rear cover (12) is arranged at the rear end of the valve body (13), the valve rod (14) is arranged in the valve body (13), the first piston (15) is abutted to be arranged between the end part of the valve rod (14) and the front cover (11), one end of the second piston (16) is abutted to the valve rod (14), the spacer (17) is assembled between the valve body (13) and the rear cover (12), the spacer (17) is sleeved outside the second piston (16), and the return spring (18) is positioned in the spacer (17), and two ends of the return spring are respectively abutted to the other end surfaces of the second piston (16).
  2. 2. The pilot-operated back pressure switching valve according to claim 1, wherein sealing gaskets (19) are provided between the front cover (11) and the front end of the valve body (13) and between the rear cover (12) and the rear end of the valve body (13).
  3. 3. The pilot-operated back pressure switching valve according to claim 1, wherein the valve body (13) is provided with a first working air pressure output port (13 a) and a second working air pressure output port (13 b), the first working air pressure output port (13 a) and the second working air pressure output port (13 b) are both communicated with an assembly space where the valve rod (14) is located, the first working air pressure output port (13 a) is communicated with an air inlet of a rear cover (12) of the air cylinder, and the second working air pressure output port (13 b) is communicated with an air inlet of a front cover (11) of the air cylinder.
  4. 4. A pilot back pressure switching valve according to claim 3, wherein the valve body (13) is provided with three external air source vents (13 c), and the three external air source vents (13 c) are respectively communicated with a pressure reducing valve.
  5. 5. The pilot-operated back pressure switching valve according to claim 4, wherein a main exhaust port (13 d) is provided in the valve body (13), and the main exhaust port (13 d) is communicated with the first working air pressure output port (13 a).
  6. 6. The pilot-operated back pressure switching valve according to claim 5, wherein the first working air pressure output port (13 a), the second working air pressure output port (13 b), the three external air source vents (13 c), the main exhaust port (13 d), and the valve rod (14) are all provided with sealing gaskets (19) at the joints with the valve body (13).
  7. 7. The pilot operated back pressure switching valve according to claim 1, wherein the pilot valve assembly (20) comprises a coil assembly (21), a first rubber plug (22), a push rod (23), a second rubber plug (24), a movable iron core (25) and a valve seat (26), the movable iron core (25) is slidably arranged in the coil assembly (21), the second rubber plug (24) is arranged in the movable iron core (25), one end of the movable iron core (25) is abutted to the push rod (23), the push rod (23) and the first rubber plug (22) are arranged in the valve seat (26), and the first rubber plug (22) is positioned at the other end of the push rod (23).
  8. 8. The pilot-operated back pressure switching valve according to claim 7, wherein a pilot valve exhaust port (26 a) and a pilot valve operation port (26 b) are provided on the valve seat (26), the pilot valve exhaust port (26 a) is provided corresponding to the first plug (22), and the pilot valve operation port (26 b) is provided corresponding to the second plug (24).
  9. 9. The pilot-operated back pressure switching valve according to claim 8, wherein a pilot gas port (11 a) is provided on the front cover (11), and the pilot gas port (11 a) is located on an outer side surface of the front cover (11) and communicates with an inside of the valve seat (26).
  10. 10. The pilot-operated back pressure switching valve according to claim 9, wherein a pilot air inlet passage (11 b) and a pilot air outlet passage (11 c) are provided on the front cover (11) on a side facing the pilot valve assembly (20), the pilot air inlet passage (11 b) is communicated with the pilot valve operation port (26 b), and the pilot air outlet passage (11 c) is communicated with the pilot valve air outlet port (26 a).

Description

Pilot-operated back pressure switching valve Technical Field The utility model relates to the technical field of valve bodies, in particular to a pilot-type back pressure switching valve. Background In the carrying operation of heavy production machinery or production tools, in order to reduce manpower dependence and labor cost, force output is usually carried out by a mechanical system, if a cylinder is adopted to drive a load, the action of the cylinder is controlled by a valve, the system needs to ensure that the load can do linear motion in function realization, the load can be safely and stably stopped at any position, and when the cylinder drives the load to move, the speed needs to be controlled, so that the safety accident is avoided being caused too fast. In the related technology, the technical scheme is that a low-friction cylinder is downwards arranged and connected with a load, the rear end of the cylinder is connected with a precise pressure reducing valve and a two-position three-way normally closed spring reset electromagnetic valve, the front end of the cylinder is connected with the precise pressure reducing valve and the two-position three-way normally closed spring reset electromagnetic valve, when the two-position three-way normally closed valves at the front end and the rear end are opened, the force at the rear end is larger than the force at the front end due to the difference of the sectional areas of the pistons, the cylinder piston rod slowly stretches out to achieve the effect of slow load falling, when the load reaches an ideal position, the electromagnetic valve at the rear end of the cylinder is closed, the electromagnetic valve at the front end continuously maintains a ventilation state, the force acting on the piston and the gravity of the load are balanced by adjusting the pressure of the precise pressure reducing valve, so that the load can be stationary at any position, and the space position of the load can be freely adjusted. The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art. Disclosure of utility model The utility model aims to solve the technical problems of providing a pilot type back pressure switching valve, realizing the simplification and independent control of a load gas circuit, and reducing the use cost and the installation and maintenance difficulty. In order to achieve the aim, the technical scheme adopted by the utility model is that the pilot back pressure switching valve comprises a main valve assembly, a pilot valve assembly and a connector assembly, wherein the pilot valve assembly is positioned at the front end of the main valve assembly, the connector assembly is used for supplying power to the pilot valve assembly, and the pilot valve assembly is used for controlling the main valve assembly to work according to a power-on and power-off state; The main valve assembly comprises a front cover, a rear cover, a valve body, a valve rod, a first piston, a second piston, a spacer and a return spring, wherein the front cover is positioned between the front end of the valve body and the pilot valve assembly, the rear cover is arranged at the rear end of the valve body, the valve rod is arranged in the valve body, the first piston is abutted to the end part of the valve rod and the front cover, one end of the second piston is abutted to the valve rod, the spacer is assembled between the valve body and the rear cover and sleeved outside the second piston, the return spring is positioned in the spacer, and two ends of the return spring are respectively abutted to the other end surfaces of the rear cover and the second piston. Further, sealing gaskets are arranged between the front cover and the front end of the valve body and between the rear cover and the rear end of the valve body. Further, a first working air pressure output port and a second working air pressure output port are formed in the valve body, the first working air pressure output port and the second working air pressure output port are communicated with an assembly space where the valve rod is located, the first working air pressure output port is communicated with a rear cover air inlet of the air cylinder, and the second working air pressure output port is communicated with a front cover air inlet of the air cylinder. Furthermore, three external air source air vents are formed in the valve body, and the three external air source air vents are respectively communicated with a pressure reducing valve. Further, a main exhaust port is formed in the valve body and is communicated with the first working air pressure output port. Further, the first working air pressure output port, the second working air pressure output port, the three external air source ve