A safety interlock system for hydraulic actuators

Abstract

This invention provides a safety interlock system for a hydraulic actuator, comprising a power source, a control system, and an actuator. The power source is connected to two multi-way valve reversing connections via a pilot control module within the control system. Each of the two multi-way valve reversing connections has a speed limiting valve and a hydraulically controlled check valve on its hydraulic oil supply path. The speed limiting valve and hydraulically controlled check valve on the two multi-way valve reversing connections are correspondingly configured. The actuator is connected to the hydraulic oil supply path of the two multi-way valve reversing connections. The beneficial effect of this invention is that it uses the pressure generated by the pilot flow of two hydraulic cylinders to trigger the hydraulically controlled check valve, achieving a specific interlock function for the actions of the two hydraulic cylinders. This solves a series of problems in existing technologies that use electrical program interlock circuits, such as system complexity, reduced reliability, and decreased maintainability. This system uses a flow-pressure conversion circuit as the interlock opening condition, reducing the overall energy loss and heat generation of the system.

Description

Technical Field

[0001] This invention relates to the field of oilfield operation equipment technology, and more specifically to a safety interlock system for hydraulic actuators. Background Technology

[0002] Current drilling processes require the close coordination of two hydraulic cylinders. To ensure the coordinated movement of the two cylinders, manual verification is currently required, which is time-consuming and labor-intensive. However, operator fatigue and negligence can easily lead to operational accidents.

[0003] Currently, some devices use electrical program interlock circuits to test and verify hydraulic cylinders. However, relying on electrical program interlock circuits will make the system complex, reduce reliability and maintainability, and greatly reduce engineering efficiency. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and provides a safety interlock system for hydraulic actuators.

[0005] The objective of this invention is achieved through the following technical solution.

[0006] A safety interlock system for a hydraulic actuator includes a power source, a control system, and an actuator. The power source is connected to two multi-way valve reversing connections via a pilot control module within the control system. Each of the two multi-way valve reversing connections has a speed limiting valve and a hydraulically controlled check valve in its hydraulic oil supply path. The speed limiting valve and the hydraulically controlled check valve on the two multi-way valve reversing connections are correspondingly configured. The actuator is connected to the hydraulic oil supply path of the two multi-way valve reversing connections.

[0007] The pilot control module uses a multi-way valve.

[0008] The two multi-way valve reversing connections are respectively the first multi-way valve reversing connection and the second multi-way valve reversing connection. The first multi-way valve reversing coupling is provided with a first oil port A and a first oil port B. A first hydraulically controlled check valve is provided in the passage connecting the first oil port A to the first hydraulic cylinder of the actuator. A passage connecting the first oil port B to the first hydraulic cylinder is provided to the second speed limiting valve. The second multi-way valve reversing coupling is provided with a second oil port A and a second oil port B. A second hydraulic control check valve is provided in the passage connecting the second oil port A to the second hydraulic cylinder of the actuator. The second hydraulic control check valve is controlled by a second speed limiting valve. A passage is provided in the passage connecting the first oil port B to the first hydraulic cylinder and connected to the first speed limiting valve. The first speed limiting valve controls the first hydraulic control check valve.

[0009] The first hydraulic cylinder and the second hydraulic cylinder are push rod hydraulic cylinders.

[0010] The power source device includes a motor and a drive hydraulic pump. The motor and the drive hydraulic pump are connected together, and the drive hydraulic pump is connected to the control system.

[0011] The beneficial effects of this invention are as follows: This solution provides a method in which two hydraulic cylinders trigger the operation of a hydraulically controlled check valve through the pressure generated by the pilot flow, achieving interlocking of specific actions of the two hydraulic cylinders. This solves a series of problems in the prior art, such as the complexity of the system, reduced reliability, and decreased maintainability caused by the use of electrical program interlocking circuits. This system uses a flow-pressure conversion circuit as the interlocking opening condition and a speed control valve as the flow-pressure conversion element, reducing the overall energy loss of the system and effectively reducing the overall heat generation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention; In the diagram: 1. Motor; 2. Drive hydraulic pump; 31. Pilot control module; 32. First multi-way valve reversing link; 33. Second multi-way valve reversing link; 41. First hydraulic check valve; 42. Second hydraulic check valve; 51. First speed limiting valve; 52. Second speed limiting valve; 6. First hydraulic cylinder; 7. Second hydraulic cylinder. Detailed Implementation

[0013] The technical solution of the present invention will be further described below through specific embodiments.

[0014] Example

[0015] A safety interlock system for a hydraulic actuator includes a power source, a control system, and an actuator. The power source is connected to two multi-way valve reversing connections via a pilot control module 31 within the control system. Each of the two multi-way valve reversing connections has a speed limiting valve and a hydraulically controlled check valve in its hydraulic oil supply path. The speed limiting valve and hydraulically controlled check valve on the two multi-way valve reversing connections are correspondingly configured. The actuator is connected to the hydraulic oil supply path of the two multi-way valve reversing connections.

[0016] The pilot control module 31 uses a multi-way valve.

[0017] The two multi-way valve reversing connections are the first multi-way valve reversing connection 32 and the second multi-way valve reversing connection 33. The first multi-way valve reversing coupling 32 is provided with a first oil port A and a first oil port B. A first hydraulically controlled check valve 41 is provided in the passage connecting the first oil port A to the first hydraulic cylinder 6 of the actuator. A passage connecting the first oil port B to the first hydraulic cylinder 6 is provided to the second speed limiting valve 52. The second multi-way valve reversing coupling 33 is provided with a second oil port A and a second oil port B. The passage connecting the second oil port A to the second hydraulic cylinder 7 of the actuator is provided with a second hydraulic control check valve 42. The second hydraulic control check valve 42 is controlled by a second speed limiting valve 52. The passage connecting the first oil port B to the first hydraulic cylinder 6 is provided with a passage connected to the first speed limiting valve 51. The first speed limiting valve 51 controls the first hydraulic control check valve 41.

[0018] The first hydraulic cylinder 6 and the second hydraulic cylinder 7 are push rod hydraulic cylinders.

[0019] The power source device includes a motor 1 and a drive hydraulic pump 2. The motor 1 and the drive hydraulic pump 2 are connected together, and the drive hydraulic pump 2 is connected to the control system.

[0020] The working principle of this invention is as follows: the hydraulic system is powered by a motor 1 and a driving hydraulic pump 2. A multi-way valve is used as a pilot control module 31 in the system, responsible for providing safety protection for the hydraulic system while distributing oil to the first multi-way valve reversing coupling 32 and the second multi-way valve reversing coupling 33.

[0021] In non-working states, the hydraulic system needs to operate at low pressure. At this time, motor 1 and drive hydraulic pump 2 provide power to the hydraulic system. The load signal circuit of hydraulic pump 2 is in an unloaded state, resulting in significant energy savings and effectively extending the lifespan of the hydraulic pump.

[0022] In operation, the pumped oil is sequentially delivered to the first multi-way valve reversing coupling 32 and the second multi-way valve reversing coupling 33 via the multi-way valve inlet coupling. The first multi-way valve reversing coupling 32 and the second multi-way valve reversing coupling 33 transmit the pressure required by the load to the X port of the hydraulic pump 2 through the load sensitive signal circuit. At this time, the hydraulic pump 2 increases its displacement under the push of the variable piston, thereby ensuring that the system has a sufficient flow supply.

[0023] When the working condition requires hydraulic cylinder 7 to be in a retracted clamped state before hydraulic cylinder 6 extends, hydraulic oil flows out from port B of the second multi-way valve reversing coupling 33. The hydraulic oil flows into two passages: one through a pipeline into the rod chamber of hydraulic cylinder 7, and the other into the first speed limiting valve 51. When the flow rate reaches the set value of the first speed limiting valve 51, the first hydraulically controlled check valve 41 is opened. At this time, operating the first multi-way valve reversing coupling 32 allows hydraulic oil to flow out from port A into hydraulic cylinder 6, realizing the extension action of hydraulic cylinder 6. The extension action of hydraulic cylinder 7 corresponds to that of hydraulic cylinder 6. The hydraulic oil flowing out from port B of the first multi-way valve reversing coupling 32 supplies oil to the rod chamber of hydraulic cylinder 6 and the second speed limiting valve 52. The second speed limiting valve 52 controls the second hydraulically controlled check valve 42 to open, thereby opening the port A passage on the second multi-way valve reversing coupling 33, realizing the delivery of hydraulic oil.

[0024] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A safety interlock system for a hydraulic actuator, characterized in that: It includes a power source unit, a control system, and an actuator. The power source unit is connected to the two multi-way valve reversing connections through a pilot control module set in the control system. The hydraulic oil supply passages of the two multi-way valve reversing connections are equipped with speed limiting valves and hydraulic control check valves. The speed limiting valves and hydraulic control check valves set on the two multi-way valve reversing connections are set accordingly. The actuator is connected to the hydraulic oil supply passages of the two multi-way valve reversing connections. The two multi-way valve reversing connections are respectively the first multi-way valve reversing connection and the second multi-way valve reversing connection. The first multi-way valve reversing coupling is provided with a first oil port A and a first oil port B. A first hydraulically controlled check valve is provided in the passage connecting the first oil port A to the first hydraulic cylinder of the actuator. A passage connecting the first oil port B to the first hydraulic cylinder is provided to the second speed limiting valve. The second multi-way valve reversing coupling is provided with a second oil port A and a second oil port B. The passage connecting the second oil port A to the second hydraulic cylinder of the actuator is provided with a second hydraulic control check valve. The second hydraulic control check valve is controlled by a second speed limiting valve. The passage connecting the first oil port B to the first hydraulic cylinder is provided with a passage connected to the first speed limiting valve. The first speed limiting valve controls the first hydraulic control check valve. When the working condition requires the hydraulic cylinder to be in the retracted clamping state before it extends, the hydraulic oil flows out from port B of the second multi-way valve reversing connection. The hydraulic oil flows into two passages: one path enters the oil rod chamber of the hydraulic cylinder through the pipeline, and the other path enters the first speed limiting valve. When the flow rate reaches the set value of the first speed limiting valve, the first hydraulic control check valve is opened. At this time, the first multi-way valve reversing connection is operated to make the hydraulic oil flow out from port A and enter the hydraulic cylinder, thereby realizing the extension action of the hydraulic cylinder. The extension action of the hydraulic cylinder corresponds to the hydraulic oil flowing out of port B in the first multi-way valve reversing connection, which respectively delivers oil to the oil rod chamber of the hydraulic cylinder and the second speed limiting valve. The second speed limiting valve controls the second hydraulic control check valve to open, thereby opening the A port passage on the second multi-way valve reversing connection and realizing the delivery of hydraulic oil.

2. The safety interlock system for a hydraulic actuator according to claim 1, characterized in that: The pilot control module uses a multi-way valve.

3. The safety interlock system for a hydraulic actuator according to claim 1, characterized in that: The first hydraulic cylinder and the second hydraulic cylinder are push rod hydraulic cylinders.

4. A safety interlock system for a hydraulic actuator according to claim 1, characterized in that: The power source device includes a motor and a drive hydraulic pump. The motor and the drive hydraulic pump are connected together, and the drive hydraulic pump is connected to the control system.

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