CN111706568A - A clamping cylinder pressurization and decompression switching circuit and switching method thereof - Google Patents

Abstract

The present invention provides a clamping cylinder pressurization and decompression switching circuit and a method thereof, comprising the following steps: Step S001 : adjusting the first pressure reducing valve to the required high pressure, and adjusting the second pressure reducing valve to the required high pressure low pressure; step S002: when the clamping cylinder needs to be activated, the first pilot valve is in a cut-off state, and the second pilot valve is in a conducting state, and the first pressure reducing valve is connected with the first on-off valve, this When the clamping cylinder is in a high-pressure operation; Step S003: when the clamping cylinder is in the clamping state, the first pilot valve is in a conducting state, and the second pilot valve is in a blocking state, at this time, the second pressure reducing valve is connected to the second The shut-off valve is turned on, and the clamping cylinder is kept at low pressure at this time. The clamping cylinder pressurization and decompression switching circuit and the switching method thereof of the invention can switch the clamping cylinder between a high-pressure operating state and a low-pressure maintaining state, prevent the phenomenon of jumping out of the support wheel when the steel pipe is quenched, and solve the problem of bumping and scratching the outer surface of the steel pipe. , reduce the defects on the outer surface of the steel pipe and increase the yield of the steel pipe.

Description

A clamping cylinder pressurization and decompression switching circuit and switching method thereof

technical field

The invention belongs to the related technical field of compression of steel pipe quenching equipment, and in particular relates to a pressure and decompression switching circuit of a clamping cylinder and a switching method thereof.

Background technique

The straightness of the overall quenching of the steel pipe is the main parameter for evaluating the success or failure of the quenching process. Tests have shown that rotating the steel pipe at a certain speed during quenching will greatly increase the straightness of the steel pipe. The steel pipe rotates on the support wheel, especially when it rotates at high speed, it is easy to jump out of the rotating device. In order to prevent the steel pipe from jumping out during the quenching process, and to ensure the straightness of the steel pipe, the steel pipe needs to be clamped during the high-speed rotation process. The size of the clamping force will affect the surface quality of the steel pipe. If the clamping force is too large, the rotation resistance will inevitably increase, and the outer surface of the steel pipe will be bruised and scratched, resulting in defects on the outer surface of the steel pipe and affecting the yield of the steel pipe; If the clamping force is too small, it will be difficult to compress the steel pipe and the steel pipe will jump out of the support wheel.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a clamping cylinder pressurization and decompression switching circuit and a switching method thereof, which are used to overcome the above problems or at least partially solve or alleviate the above problems.

The present invention proposes a clamping cylinder pressurization and decompression switching circuit, comprising:

A high-pressure medium circuit, one end of the high-pressure medium circuit is connected with the oil pump, and the other end is connected with a first pressure reducing valve and a second pressure reducing valve in parallel. Different pressures;

a first pilot valve and a second pilot valve, the inlet of the first pilot valve is connected with the outlet of the first pressure reducing valve, the inlet of the second pilot valve is connected with the outlet of the second pressure reducing valve Pass;

The first on-off valve and the second on-off valve, the shells of the first on-off valve and the second on-off valve are respectively provided with an inlet, a control port and an outlet, and the first on-off valve is provided with an inlet, a control port and an outlet. The control port is communicated with the outlet of the first pilot valve, the inlet on the first on-off valve is communicated with the outlet of the first pressure reducing valve; the The control port is communicated with the outlet of the second pilot valve, and the inlet on the second on-off valve is communicated with the outlet of the first pressure reducing valve;

a low-pressure medium circuit, one end of the low-pressure medium circuit is respectively connected with the outlet of the first on-off valve and the outlet of the second on-off valve, and the other end is connected with the inlet of the clamping cylinder;

The oil return pipeline is communicated with the outlet of the clamping cylinder.

The present invention also has the following optional features.

Optionally, the first on-off valve and the second on-off valve are large-diameter cartridge valves.

Optionally, the first pressure reducing valve and the second pressure reducing valve are manual adjustment valves.

Optionally, the first pilot valve and the second pilot valve are two-position four-way valves, which are in a conducting state in an initial state and are in a blocking state in a switching state.

Optionally, the first pilot valve and the second pilot valve are two-position four-way solenoid valves, which are in a conducting state in a power-off state and are in a cut-off state in a power-on state.

Optionally, a first check valve is further connected between the outlet of the first pressure reducing valve and the inlet of the first pilot valve; the outlet of the second pressure reducing valve is connected to the outlet of the second pilot valve. A second check valve is also connected between the inlets.

Optionally, the high-pressure medium circuit, the low-pressure medium circuit, the first on-off valve and the second on-off valve are all integrated into one valve block.

The present invention also proposes a method for switching between pressure and decompression of a clamping cylinder, which is implemented by adopting any of the above-mentioned switching circuits for pressure and decompression of a clamping cylinder, and includes the following steps:

Step S001: adjusting the first pressure reducing valve to the required high pressure, and adjusting the second pressure reducing valve to the required low pressure;

Step S002: when the clamping cylinder needs to be activated, the first pilot valve is in a cut-off state, and the second pilot valve is in an on-state, at this time the first pressure reducing valve is connected with the first on-off valve, and the clamping Cylinder high pressure operation;

Step S003: when the clamping cylinder is in the clamping state, the first pilot valve is turned on, and the second pilot valve is turned off. At this time, the second pressure reducing valve is connected to the second on-off valve. The clamping cylinder remains low pressure.

The clamping cylinder pressurization and decompression switching circuit and its switching method of the present invention switch the low-pressure medium circuit and the first on-off valve or the second on-off valve or the second pilot valve by controlling the conduction or cut-off of the first pilot valve and the second pilot valve. The on-off valve is connected, so that the high-pressure medium circuit is connected to the low-pressure medium circuit through the first pressure reducing valve or the second pressure-reducing valve, so as to ensure that the required pressure medium enters the low-pressure medium circuit and realizes that the high-pressure medium enters the low-pressure medium through decompression. The medium circuit controls the pressure of the clamping cylinder. Through such loop control, the clamping cylinder can realize "high pressure operation and low pressure maintenance", prevent the phenomenon of jumping out of the support wheel when the steel pipe is quenched, solve the bumps and scratches on the outer surface of the steel pipe, reduce the defects on the outer surface of the steel pipe, and increase the finished product of the steel pipe rate, to ensure the smooth implementation of the steel pipe quenching process.

Description of drawings

FIG. 1 is a schematic diagram of the structure of the clamping cylinder pressurization and decompression switching circuit of the present invention.

In the above figure: 1 High pressure medium circuit; 2 The first pressure reducing valve; 3 The second pressure reducing valve; 4 The first pilot valve; 5 The second pilot valve; 6 The first on-off valve; 7 The second on-off valve; 8 low pressure medium circuit; 9 oil return line; 10 first check valve; 11 second check valve; 12 valve block.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Detailed ways

Example 1

Referring to FIG. 1 , an embodiment of the present invention proposes a switching circuit for pressure and pressure reduction of a clamping cylinder, including: a high pressure medium circuit 1 , a first pilot valve 4 and a second pilot valve 5 , a first on-off valve 6 and a second pilot valve 6 . On-off valve 7, low pressure medium circuit 8 and oil return pipeline 9; one end of high pressure medium circuit 1 is connected with the oil pump, and the other end is connected with the first pressure reducing valve 2 and the second pressure reducing valve 3 in parallel, the first pressure reducing valve 2 and the second pressure reducing valve 3 have different pressure regulating sizes; the inlet of the first pilot valve 4 is connected with the outlet of the first pressure reducing valve 2, and the inlet of the second pilot valve 5 is connected with the outlet of the second pressure reducing valve 3 The casings of the first on-off valve 6 and the second on-off valve 7 are respectively provided with an inlet, a control port and an outlet, and the control port on the first on-off valve 6 is communicated with the outlet of the first pilot valve 4, The inlet on the first on-off valve 6 is communicated with the outlet of the first pressure reducing valve 2; the control port on the second on-off valve 7 is communicated with the outlet of the second pilot valve 5, and the The inlet is communicated with the outlet of the first pressure reducing valve 3; one end of the low pressure medium circuit 8 is respectively connected with the outlet of the first on-off valve 6 and the outlet of the second on-off valve 7, and the other end is connected with the inlet of the clamping cylinder The oil return pipeline 9 is communicated with the outlet of the clamping cylinder;

Before use, the oil pump of the pump station is connected with one end of the high-pressure medium circuit through the hydraulic pipeline, and one end of the low-pressure medium circuit is connected with the hydraulic inlet of the clamping cylinder through the hydraulic pipeline, and the hydraulic outlet of the clamping cylinder is connected through the oil return pipeline. Connect the oil tank of the pump station; when in use, first adjust the first pressure reducing valve 2 to the required high pressure, and adjust the second pressure reducing valve 3 to the required low pressure; at this time, the first pilot valve 4 and On and off the second pilot valve 5 is controlled.

When the outlet of the first pilot valve 4 is connected to the control port of the first on-off valve 6, the inlet and outlet of the first control valve 6 are cut off; when the outlet of the first pilot valve 4 is connected to the first on-off valve 6 When the control port of the first on-off valve 6 is connected with the outlet, when the outlet of the second pilot valve 5 is connected with the control port of the second on-off valve 7, the second on-off valve The inlet and outlet of the second on-off valve 7 are cut off. When the outlet of the second pilot valve 5 is blocked from the control port of the second on-off valve 7, the inlet and the outlet of the second on-off valve 7 are connected.

According to the above rules, when the clamping cylinder needs to be activated, the first pilot valve 4 should be in a cut-off state, and the second pilot valve 5 should be in a conducting state. At this time, the clamping cylinder operates at high pressure to clamp the steel pipe; after the clamping cylinder clamps the steel pipe, the first pilot valve 4 is turned on and the second pilot valve 5 is cut off, and the second pressure reduction The valve 3 is connected to the second on-off valve 7, and the clamping cylinder is kept at low pressure at this time, which can not only prevent the phenomenon of jumping out of the support wheel when the steel pipe is quenched, but also prevent the clamping cylinder from bumping or scratching the outer surface of the steel pipe. Defects on the outer surface of the steel pipe are reduced, and the yield of the steel pipe is increased.

Example 2

Referring to FIG. 1 , on the basis of Embodiment 1, the first on-off valve 6 and the second on-off valve 7 are large-diameter cartridge valves.

The cartridge valve itself has an inlet, a control port and an outlet. After the pressure is supplied to the control port, the conduction between the inlet and the outlet will be cut off. After the pressure of the control port is released, the inlet and the outlet can be connected by supplying pressure to the inlet. The shut-off valve 6 and the second on-off valve 7 can meet the requirement of switching between pressurization and depressurization of the clamping cylinder by using large-diameter cartridge valves.

Example 3

Referring to FIG. 1 , on the basis of Embodiment 2, the first pressure reducing valve 2 and the second pressure reducing valve 3 are manual adjustment valves.

Manually adjusting the first pressure reducing valve 2 and the second pressure reducing valve 3 has pressure stability, which can greatly enhance the anti-pollution ability of the circuit.

Example 4

Referring to FIG. 1 , on the basis of Embodiment 1 or 3, the first pilot valve 4 and the second pilot valve 5 are two-position four-way valves, which are in the conducting state in the initial state and in the blocking state in the switching state.

The first pilot valve 4 and the second pilot valve 5 are in the conducting state in the initial state, that is, the control port of the first on-off valve 6 and the control port of the second on-off valve 7 are respectively supplied with pressure, so that the first on-off valve The inlet and outlet of 6 and the second on-off valve 7 are in the cut-off state, and the clamping cylinder is not activated at this time. After switching one of the first pilot valve 4 and the second pilot valve 5, the clamping cylinder starts. Clamping starts at the pressure corresponding to the first pilot valve 4 or the second pilot valve 5 in the switched state corresponding to the first pressure reducing valve 2 or the second pressure reducing valve 3 .

Example 5

Referring to FIG. 1 , on the basis of Embodiment 4, the first pilot valve 4 and the second pilot valve 5 are two-position four-way solenoid valves, which are in a conducting state in a de-energized state, and are in a blocking state in an energized state.

The first pilot valve 4 and the second pilot valve 5 are solenoid valves, which can be controlled by a controller such as PLC, so as to be automated or semi-automated.

Example 6

Referring to FIG. 1 , on the basis of Embodiment 1 or 5, a first check valve 10 is also connected between the outlet of the first pressure reducing valve 2 and the inlet of the first pilot valve 4 ; the outlet of the second pressure reducing valve 3 is also connected. A second check valve 11 is also connected to the inlet of the second pilot valve 5 .

The first check valve 10 and the second check valve 11 can respectively prevent the hydraulic oil from flowing backward from the inlet of the first pilot valve 4 and the inlet of the second pilot valve 5 into the hydraulic pipeline connected thereto.

Example 7

Referring to FIG. 1 , on the basis of Embodiment 1 or 6, the high-pressure medium circuit 1 , the low-pressure medium circuit 9 , the first on-off valve 6 and the second on-off valve 7 are all integrated into a valve block 12 .

The high-pressure medium circuit 1 and the low-pressure medium circuit 9 can be directly hydraulic oil passages in the valve block 12 , and the valve block 12 can also be directly used as the valve body of the first on-off valve 6 and the second on-off valve 7 .

Example 8

The implementation of the present invention proposes a clamping cylinder pressurization and decompression switching method, which is implemented by the clamping cylinder pressurization and decompression switching circuit described in any of the above embodiments, including the following steps: Step S001: the first decompression The valve 2 is adjusted to the required high pressure, and the second pressure reducing valve 3 is adjusted to the required low pressure; Step S002: when the clamping cylinder needs to be activated, the first pilot valve 4 is in a cut-off state, so that the second pilot The valve 5 is in the conducting state, at this time the first pressure reducing valve 2 and the first on-off valve 6 are conducting, and the clamping cylinder is running at high pressure at this time; Step S003: when the clamping cylinder is in the clamping state, make the first pilot The valve 4 is in a conducting state, so that the second pilot valve 5 is in a blocking state, at this time, the second pressure reducing valve 3 is connected with the second on-off valve 7, and the clamping cylinder is kept at a low pressure at this time.

In step S001, the high pressure adjusted by the first pressure reducing valve 2 is the operating pressure at which the clamping cylinder starts to clamp the steel pipe, and the low pressure adjusted by the second pressure reducing valve 3 is the holding pressure after the clamping cylinder clamps the steel pipe ;

In step S002, the first pilot valve 4 is switched to the cut-off state, and the second pilot valve 5 is kept in the conducting state. At this time, the control port of the first on-off valve 6 loses pressure, and the inlet and outlet of the first on-off valve 6 It can be turned on under pressure, and the control port of the second on-off valve 7 is supplied with pressure and cannot be turned on, so the inlet and outlet of the second on-off valve 7 are cut off, so that the hydraulic oil in the high-pressure medium circuit 1 passes through the first reduction. After pressing valve 2, it flows into the low-pressure medium circuit 8 through the first on-off valve 6, and finally enters the inlet of the clamping cylinder, so that the clamping cylinder operates at high pressure;

In step S003, the second pilot valve 5 is switched to the blocking state, and the first pilot valve 4 is switched to the conducting state. At this time, the control port of the second on-off valve 7 loses pressure, and the inlet of the second on-off valve 7 and the The outlet can be conducted under pressure, and the control port of the first on-off valve 6 is supplied with pressure and cannot be conducted, so the inlet and outlet of the first on-off valve 6 are cut off, so that the hydraulic oil in the high-pressure medium circuit 1 passes through the second on-off valve 6. After the pressure reducing valve 3, it flows into the low-pressure medium circuit 8 through the second on-off valve 7, and finally enters the inlet of the clamping cylinder, so that the clamping cylinder maintains the low-pressure clamping state.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims. Components and structures not described in detail in this embodiment belong to well-known components and common structures or common means in the industry, and will not be described one by one here.

Claims (8)

1. A clamping cylinder pressurization and decompression switching circuit is characterized in that, comprising: A high-pressure medium circuit (1), one end of the high-pressure medium circuit (1) is connected with the oil pump, and the other end is connected with a first pressure reducing valve (2) and a second pressure reducing valve (3) in parallel. The pressure regulating size of the pressure valve (2) and the second pressure reducing valve (3) are different; A first pilot valve (4) and a second pilot valve (5), the inlet of the first pilot valve (4) is communicated with the outlet of the first pressure reducing valve (2), the second pilot valve ( The inlet of 5) is communicated with the outlet of the second pressure reducing valve (3); A first on-off valve (6) and a second on-off valve (7), the casings of the first on-off valve (6) and the second on-off valve (7) are respectively provided with an inlet and a control port and outlet, the control port on the first on-off valve (6) is communicated with the outlet of the first pilot valve (4), and the inlet on the first on-off valve (6) is connected with the outlet of the first on-off valve (6) The outlet of the first pressure reducing valve (2) is communicated; the control port on the second on-off valve (7) is communicated with the outlet of the second pilot valve (5), and the second on-off valve (7) is communicated with the outlet of the second pilot valve (5). The inlet on the valve (7) is communicated with the outlet of the first pressure reducing valve (3); A low-pressure medium circuit (8), one end of the low-pressure medium circuit (8) is respectively connected with the outlet of the first on-off valve (6) and the outlet of the second on-off valve (7), and the other end is connected with the outlet of the first on-off valve (6) and the outlet of the second on-off valve (7). The inlet of the clamping cylinder is connected; An oil return line (9), the oil return line (9) is communicated with the outlet of the clamping cylinder. 2. The clamping cylinder pressurization and decompression switching circuit according to claim 1, wherein the first on-off valve (6) and the second on-off valve (7) are large-diameter cartridges valve. 3. The clamping cylinder pressurization and decompression switching circuit according to claim 1, characterized in that the first decompression valve (2) and the second decompression valve (3) are manual regulating valves. 4. The clamping cylinder pressurization and decompression switching circuit according to claim 1, characterized in that the first pilot valve (4) and the second pilot valve (5) are two-position four-way valves, and the first pilot valve (4) and the second pilot valve (5) are two-position four-way valves. In the initial state, it is in the conduction state, and in the switching state, it is in the cut-off state. 5. The clamping cylinder pressurization and decompression switching circuit according to claim 4, wherein the first pilot valve (4) and the second pilot valve (5) are two-position four-way solenoid valves, In the power-off state, it is in the conduction state, and in the power-on state, it is in the cut-off state. 6 . The clamping cylinder pressurization and decompression switching circuit according to claim 1 , characterized in that there is a further connection between the outlet of the first decompression valve ( 2 ) and the inlet of the first pilot valve ( 4 ). 7 . A first check valve (10) is connected; a second check valve (11) is also connected between the outlet of the second pressure reducing valve (3) and the inlet of the second pilot valve (5). 7. The clamping cylinder pressurization and decompression switching circuit according to claim 1, characterized in that the high pressure medium circuit (1), the low pressure medium circuit (9), the first on-off valve (6) ) and the second on-off valve (7) are integrated into a valve block (12). 8. A method for switching between pressure and decompression of a clamping cylinder, implemented by adopting the circuit for switching between pressure and decompression of the clamping cylinder according to any one of claims 1 to 7, wherein the method comprises the following steps: Step S001: adjusting the first pressure reducing valve (2) to the required high pressure, and adjusting the second pressure reducing valve (3) to the required low pressure; Step S002: when the clamping cylinder needs to be activated, the first pilot valve (4) is in a cut-off state, and the second pilot valve (5) is in a conducting state, and at this time the first pressure reducing valve (2) is connected to the first pilot valve (2). The shut-off valve (6) is turned on, and the clamping cylinder operates at high pressure at this time; Step S003: when the clamping cylinder is in the clamping state, the first pilot valve (4) is in a conducting state, and the second pilot valve (5) is in a blocking state. At this time, the second pressure reducing valve (3) and the The two on-off valve (7) is turned on, and the clamping cylinder is kept at low pressure at this time.

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