Rotary cylinder mechanical hydraulic reversing circuit and reversing method

Abstract

This invention discloses a mechanical hydraulic reversing circuit and method for a rotary cylinder. The hydraulic reversing circuit includes an oil tank, a motor, a variable pump, a combined hydraulic directional valve, a check valve II, a check valve III, and a drive cylinder. The drive cylinder has a first reversing device at the rod end and a second reversing device at the rodless end. The motor drives the variable pump to drive hydraulic oil from the oil tank through the combined hydraulic directional valve into the rod or rodless chamber of the drive cylinder, pushing the piston rod of the drive cylinder to move. When the piston rod of the drive cylinder moves to the bottom of the cylinder chamber, it triggers the second or first reversing device, which then controls the combined hydraulic directional valve to reverse, thereby achieving automatic, mechanical reversing of the drive cylinder. This hydraulic reversing circuit enables automatic mechanical reversing of the rotary cylinder, which is simple and convenient to operate, reduces the number of measuring instruments, lowers equipment costs, and solves the problem of not being able to install measuring instruments on the actuators under some special working conditions.

Description

Technical Field

[0001] This invention relates to the field of hydraulic equipment technology, specifically to a rotary cylinder mechanical hydraulic reversing circuit and reversing method. Background Technology

[0002] In various well-drilling machines such as vertical shaft drilling rigs and vertical shaft tunneling machines, since the equipment operates submerged underwater, the testing instruments on the mechanical structure need to be professionally encapsulated or specially designed. At the same time, the cables on the underwater instruments also need to be waterproofed and protected, which to some extent increases the technical difficulty and production cost. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a mechanical hydraulic reversing circuit and reversing method for a rotary cylinder. This hydraulic reversing circuit enables the rotary cylinder to automatically reverse mechanically, making operation simple and convenient, reducing the number of measuring instruments, lowering equipment costs, and solving the problem of not being able to install measuring instruments on the actuators under some special working conditions.

[0004] To achieve the above objectives, the specific solution adopted by the present invention is as follows:

[0005] A rotary cylinder mechanical hydraulic reversing circuit, the hydraulic reversing circuit includes an oil tank, a motor, a variable pump, an unloading valve, a combined hydraulic reversing valve, a check valve II, a check valve III, a pressure gauge, and an active cylinder;

[0006] The rod end of the active cylinder is provided with a first reversing device, and the rodless end is provided with a second reversing device.

[0007] The motor drives the variable pump to drive hydraulic oil from the oil tank through the combined hydraulic directional valve into the rod chamber or rodless chamber of the active cylinder, pushing the piston rod of the active cylinder to move. When the piston rod of the active cylinder moves to the bottom of the cylinder, the piston triggers the second directional device or the first directional device. The second directional device or the first directional device then controls the combined hydraulic directional valve to switch, thereby realizing the automatic and mechanical switching of the active cylinder.

[0008] As a preferred option, the combined hydraulic directional valve is a multi-functional valve consisting of a main valve, a pilot valve, and dual one-way throttle valves;

[0009] Both the main valve and the pilot valve are two-position four-way directional valves.

[0010] The first port of the main valve is connected to the variable pump, the second port is connected to the oil tank, the third port is connected to the rod chamber of the active cylinder, and the fourth port is connected to the rodless chamber of the active cylinder.

[0011] The first port of the pilot valve is connected to the variable pump, the second port is connected to the oil tank, the third port is connected to the right working position control port of the main valve through a double one-way throttle valve, and the fourth port is connected to the left working position control port of the main valve through a double one-way throttle valve.

[0012] As a preferred embodiment, the hydraulic reversing circuit further includes at least one driven cylinder, wherein the rodless chamber of the driven cylinder is connected to the third port of the main valve, and the rod chamber is connected to the fourth port of the main valve.

[0013] As a preferred embodiment, both the first reversing device and the second reversing device are two-position two-way valves controlled by springs.

[0014] As a preferred embodiment, the first port of the first reversing device is connected to the variable pump, and the second port is connected to the right working position control port of the pilot valve.

[0015] The first port of the second reversing device is connected to the variable pump, and the second port is connected to the left working position control port of the pilot valve.

[0016] As a preferred embodiment, when the first reversing device is disconnected, the hydraulic oil sealed between the first reversing device and the combined hydraulic reversing valve is discharged back to the oil tank in sequence through check valve III and the combined hydraulic reversing valve; when the second reversing device is disconnected, the hydraulic oil sealed between the second reversing device and the combined hydraulic reversing valve is discharged back to the oil tank in sequence through check valve II and the combined hydraulic reversing valve.

[0017] As a preferred option, the outlet of the variable pump is equipped with a flow meter for monitoring the specific position of the active cylinder.

[0018] A mechanical hydraulic reversing method using a rotary cylinder mainly includes the following steps:

[0019] Step 1: The motor drives the variable pump to drive the hydraulic oil from the oil tank through the combined hydraulic directional valve, through oil circuit A to the rod chamber of the active cylinder, and push the piston rod of the active cylinder to move.

[0020] Step 2: When the piston rod of the active cylinder moves to the bottom of the rodless chamber, the piston triggers the second reversing device. The second reversing device controls the combined hydraulic reversing valve to switch, thereby realizing the high and low pressure switching of the A and B oil circuits of the combined hydraulic reversing valve once. The B oil circuit starts to receive high pressure oil, and the A oil circuit returns oil.

[0021] Step 3: After switching, the high-pressure oil flows along oil circuit B to the rodless chamber of the active cylinder, pushing the piston rod of the active cylinder to extend. At the same time, the second reversing device is disconnected, and the high-pressure oil sealed between the second reversing device and the combined hydraulic reversing valve is depressurized through check valve II.

[0022] Step 4: After the piston rod of the active cylinder extends to the bottom of the chamber, the piston triggers the first reversing device. The first reversing device controls the combined hydraulic reversing valve to switch directions. The high and low pressure of the A and B oil circuits of the combined hydraulic reversing valve are switched again. High pressure oil starts to enter the A oil circuit, and oil returns to the B oil circuit.

[0023] Step 5: After switching, the high-pressure oil circulates along the direction of oil circuit A, repeating the route of step 1, while the first reversing device is disconnected; the high-pressure oil sealed between the first reversing device and the combined hydraulic reversing valve is depressurized through check valve III.

[0024] During the movement of the active cylinder, the driven cylinder passively follows the active cylinder and moves together.

[0025] Beneficial effects:

[0026] 1) The hydraulic reversing circuit of this invention includes an oil tank, a motor, a variable pump, an unloading valve, a combined hydraulic reversing valve, check valve II, check valve III, and a drive cylinder. Each end of the drive cylinder has a reversing device at its bottom. The motor drives the variable pump to drive hydraulic oil from the oil tank through the combined hydraulic reversing valve to the drive cylinder, pushing the piston rod of the drive cylinder to move. When the piston rod of the drive cylinder moves to the bottom of the cylinder cavity, the piston triggers the reversing device at the bottom of the cylinder. External control oil controls the combined hydraulic reversing valve to reverse through the reversing device, thereby realizing the reversing of the drive cylinder. The piston rod of the drive cylinder moves in the opposite direction. As the piston rod moves, the piston leaves the reversing device at the bottom of the cylinder, and the reversing device closes. The control oil sealed between the reversing device of the drive cylinder and the combined hydraulic reversing valve is discharged back to the oil tank through check valve II or check valve III. This invention realizes mechanical automatic reversing of the rotary cylinder. This reversing circuit is not only simple and reliable, but also solves the problem of some hydraulic reversing circuits where it is difficult to place measuring instruments in the actuator for various reasons.

[0027] 2) The hydraulic reversing circuit of the present invention also includes at least one driven cylinder. The driven cylinder does not contain a reversing device and moves together with the driving cylinder.

[0028] 3) The hydraulic reversing circuit of the present invention is equipped with a flow meter, which can indirectly monitor the specific movement position of the oil cylinder. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the combined hydraulic directional valve in this invention.

[0030] Figure 2 This is one of the schematic diagrams of the hydraulic reversing circuit in this invention.

[0031] Figure 3 This is the second schematic diagram of the hydraulic reversing circuit in this invention.

[0032] Figure 4 This is the third schematic diagram of the hydraulic reversing circuit in this invention.

[0033] Figure 5 This is the fourth schematic diagram of the hydraulic reversing circuit in this invention.

[0034] Figure 6 This is the fifth schematic diagram of the hydraulic reversing circuit in this invention.

[0035] In the diagram: 1. Oil tank, 2. Motor, 3. Variable pump, 4. Check valve I, 5. Unloading valve, 6. Flow meter, 7. Combined hydraulic directional valve, 701. Pilot valve, 702. Double check throttle valve, 703. Main valve, 8. Check valve II, 9. Check valve III, 10. Pressure gauge, 11. Driving cylinder, 12. Driven cylinder, 13. First directional control device, 14. Second directional control device. Detailed Implementation

[0036] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0037] A mechanical hydraulic reversing circuit for a rotary cylinder, please refer to... Figure 2 The hydraulic reversing circuit includes an oil tank 1, a motor 2, a variable pump 3, a check valve I 4, an unloading valve 5, a combined hydraulic reversing valve 7, a check valve II 8, a check valve III 9, a pressure gauge 10, and an active cylinder 11.

[0038] The combined hydraulic directional valve 7 is a multi-functional valve composed of a main valve 703, a pilot valve 701, and a double one-way throttle valve 702. Both the main valve 703 and the pilot valve 701 are two-position four-way directional valves. The first port P2 of the main valve 703 is connected to the variable pump 3, the second port T2 is connected to the oil tank 1, the third port A2 is connected to the rod chamber of the drive cylinder 11, and the fourth port B2 is connected to the rodless chamber of the drive cylinder 11. The first port P1 of the pilot valve 701 is connected to the variable pump 3, the second port T1 is connected to the oil tank 1, the third port A1 is connected to the right working position control port of the main valve 703 through the double one-way throttle valve 702, and the fourth port B1 is connected to the left working position control port of the main valve 703 through the double one-way throttle valve 702.

[0039] The rod-side end of the active cylinder 11 is provided with a first reversing device 13, and the rodless end is provided with a second reversing device 14. Both the first reversing device 13 and the second reversing device 14 are spring-controlled two-position two-way valves. The first port of the first reversing device 13 is connected to the variable pump 3, and the second port is connected to the right working position control port of the pilot valve 701. When the first reversing device 13 is disconnected, the hydraulic oil sealed between the first reversing device 13 and the combined hydraulic directional valve 7 flows back to the oil tank 1 sequentially through the check valve III 9 and the combined hydraulic directional valve 7. The first port of the second reversing device 14 is connected to the variable pump 3, and the second port is connected to the left working position control port of the pilot valve 701. When the second reversing device 14 is disconnected, the hydraulic oil sealed between the second reversing device 14 and the combined hydraulic directional valve 7 flows back to the oil tank 1 sequentially through the check valve II 8 and the combined hydraulic directional valve 7.

[0040] When the hydraulic oil in the control oil circuit X flows into the combined hydraulic directional valve 7 from the second reversing device 14, the hydraulic oil reaches the pilot valve 701 through the second reversing device 14, making the left working position of the pilot valve 701 connected. The hydraulic oil flowing out of the variable pump 3 reaches the pilot valve 701, enters from the first port P1 of the pilot valve and exits from the fourth port B1. After passing through the double one-way throttle valve 702, the hydraulic oil reaches the main valve 703, making the left working position of the main valve 703 connected. In this way, the hydraulic oil flowing out of the variable pump 3 reaches the main valve 703, enters from the first port P2 of the main valve 703 and exits from the fourth port B2.

[0041] When the hydraulic oil in the control oil circuit X flows into the combined hydraulic directional valve 7 from the first reversing device 13, the hydraulic oil reaches the pilot valve 701 through the first reversing device 13, making the right working position of the pilot valve 701 connected. The hydraulic oil flowing out of the variable pump 3 reaches the pilot valve 701, enters from the first port P1 of the pilot valve and exits from the third port A1. After passing through the double one-way throttle valve 702, the hydraulic oil reaches the main valve 703, making the left working position of the main valve 703 connected. In this way, the hydraulic oil flowing out of the variable pump 3 reaches the main valve 703, enters from the first port P2 of the main valve 703 and exits from the third port A2.

[0042] Motor 2 drives variable pump 3 to drive hydraulic oil from oil tank 1 through combined hydraulic directional valve 7, along the high-pressure pipes in the A and B oil circuits of combined hydraulic directional valve 7 to reach the drive cylinder 11, pushing the piston of drive cylinder 11 to move. The return oil in drive cylinder 11 flows back to oil tank 1 along the low-pressure pipes in the A and B oil circuits of combined hydraulic directional valve 7. When the piston of drive cylinder 11 moves to the bottom of the cylinder, it triggers the second reversing device 14, causing hydraulic oil to reach combined hydraulic directional valve 7 through the second reversing device 14 and control the reversing of combined hydraulic directional valve 7, thereby realizing the reversing of drive cylinder 11. The piston of drive cylinder 11 begins to move in the opposite direction. As the piston moves, the second reversing device 14 at the bottom of the cylinder automatically closes. The control oil sealed between drive cylinder 11 and combined hydraulic directional valve 7 is discharged back to the oil tank through check valve II 8. Combined hydraulic directional valve 7 maintains its original position due to its positioning function until the next external control oil controls its reversing.

[0043] The hydraulic reversing circuit also includes at least one driven cylinder 12. The driven cylinder 12 has no reversing device. The rodless chamber of the driven cylinder 12 is connected to the third port A2 of the main valve 703, and the rod chamber is connected to the fourth port B2 of the main valve 703. In this way, the driven cylinder 12 can move together with the driving cylinder 11.

[0044] In detail, the outlet of the variable pump 3 is equipped with a flow meter 6 for monitoring the specific position of the active cylinder 11.

[0045] A mechanical hydraulic reversing method using a rotary cylinder mainly includes the following steps:

[0046] Step 1, please refer to Figure 2 Motor 2 drives variable pump 3 to drive hydraulic oil from the oil tank into the right working position of main valve 703. The oil enters from the first port P2 of main valve 703 and exits from the third port A2, reaching the rod chamber of active cylinder 11, pushing the piston rod of active cylinder 11 to retract, and the corresponding mechanical parts move. At the same time, the hydraulic oil in the rodless chamber of active cylinder 11 enters from the fourth port B2 of main valve 703 and exits from the second port T2, and then returns to oil tank 1.

[0047] Step 2, please refer to Figure 3 When the piston rod of the active cylinder 11 retracts to the bottom, the piston triggers the second reversing device 14 at the bottom of the cylinder, so that the hydraulic oil in the control oil circuit X reaches the pilot valve 701 through the second reversing device 14, and the left working position of the pilot valve 701 is connected. The hydraulic oil self-variable pump 3 reaches the pilot valve 701, enters from the first port P1 of the pilot valve and exits from the fourth port B1. After passing through the double one-way throttle valve 702, the hydraulic oil reaches the main valve 703, and the left working position of the main valve 703 is connected, so as to achieve the purpose of reversing the combined hydraulic reversing valve 7. Thus, the high and low pressure switching of the A and B oil circuits of the combined hydraulic reversing valve 7 is realized once, the B oil circuit starts to enter high pressure oil, and the A oil circuit returns oil.

[0048] Step 3, please refer to Figure 4 The hydraulic oil flowing out of the variable pump 3 enters through the first port P2 of the main valve 703 and exits through the fourth port B2. It travels along the B oil circuit to the rodless chamber of the active cylinder 11, pushing the piston rod of the active cylinder 11 to extend. The corresponding mechanical parts move, and the hydraulic oil in the rod chamber of the active cylinder 11 enters through the third port A2 of the main valve 703 and exits through the second port T2, and then returns to the oil tank 1. At the same time, the second reversing device 14 cuts off the passage of the control oil circuit X. The high-pressure oil between the second reversing device 14 and the combined hydraulic reversing valve 7 is depressurized through the check valve II 8, and the valve core position of the combined hydraulic reversing valve 7 remains unchanged.

[0049] Step 4, please refer to Figure 5 After the piston rod of the active cylinder 11 extends to a certain position, the piston triggers the first reversing device 13, so that the hydraulic oil in the control oil circuit X reaches the pilot valve 701 through the first reversing device 13, so that the right working position of the pilot valve 701 is connected. The hydraulic oil self-variable pump 3 reaches the pilot valve 701, enters from the first port P1 of the pilot valve and exits from the third port A1. After passing through the double one-way throttle valve 702, the hydraulic oil reaches the main valve 703, so that the right working position of the main valve 703 is connected, so as to achieve the purpose of reversing the combined hydraulic reversing valve 7. The high and low pressure of the A and B oil circuits of the combined hydraulic reversing valve 7 is switched once again. The A oil circuit starts to enter high pressure oil, and the B oil circuit returns oil.

[0050] Step 5, please refer to Figure 6 The hydraulic oil flowing out of the variable pump 3 enters through the first port P2 and exits through the third port A2 of the main valve 703, and repeats the route of step 1 along the direction of oil circuit A. At the same time, the first reversing device 13 cuts off the passage of the control oil circuit X. The high-pressure oil sealed between the first reversing device 13 and the combined hydraulic reversing valve 7 is depressurized through the check valve III 9, and the valve core position of the combined hydraulic reversing valve 7 remains unchanged.

[0051] The driven cylinder 12, without a reversing device, passively follows the movement of the driving cylinder 11. The two cylinders, the driving cylinder 11 and the driven cylinder 12, drive a mechanical component to perform a semi-rotational motion.

[0052] This invention discloses a mechanical hydraulic reversing circuit for a rotary cylinder, which can realize automatic mechanical reversing when the cylinder moves to the bottom, eliminating the need for separate detection instruments on the cylinder. This mechanical reversing is not only safe and reliable, but also solves the problem of not being able to install detection instruments on the actuator under some special working conditions.

[0053] The parts of this invention not described in detail are prior art.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention in any way. All equivalent transformations or modifications made in accordance with the essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A rotary cylinder mechanical hydraulic reversing circuit, characterized in that: Includes oil tank, motor, variable pump, unloading valve, combined hydraulic directional valve, check valve II, check valve III, pressure gauge and drive cylinder; The rod end of the active cylinder is provided with a first reversing device, and the rodless end is provided with a second reversing device. The motor drives the variable pump to drive hydraulic oil from the oil tank through the combined hydraulic directional valve into the rod chamber or rodless chamber of the active cylinder, pushing the piston rod of the active cylinder to move. When the piston rod of the active cylinder moves to the bottom of the cylinder, the piston triggers the second directional device or the first directional device. The second directional device or the first directional device then controls the combined hydraulic directional valve to switch, thereby realizing the automatic and mechanical switching of the active cylinder. The combined hydraulic directional valve is a multi-functional valve consisting of a main valve, a pilot valve, and dual one-way throttle valves. Both the main valve and the pilot valve are two-position four-way directional valves. The first port of the main valve is connected to the variable pump, the second port is connected to the oil tank, the third port is connected to the rod chamber of the active cylinder, and the fourth port is connected to the rodless chamber of the active cylinder. The first port of the pilot valve is connected to the variable pump, the second port is connected to the oil tank, the third port is connected to the right working position control port of the main valve through a double one-way throttle valve, and the fourth port is connected to the left working position control port of the main valve through a double one-way throttle valve. Both the first and second reversing devices are spring-controlled two-position two-way valves; the first port of the first reversing device is connected to the variable pump, and the second port is connected to the right working position control port of the pilot valve; the first port of the second reversing device is connected to the variable pump, and the second port is connected to the left working position control port of the pilot valve.

2. The rotary cylinder mechanical hydraulic reversing circuit according to claim 1, characterized in that: The hydraulic reversing circuit also includes at least one driven cylinder, the rodless chamber of which is connected to the third port of the main valve, and the rod chamber of which is connected to the fourth port of the main valve.

3. The rotary cylinder mechanical hydraulic reversing circuit according to claim 1, characterized in that: When the first reversing device is disconnected, the hydraulic oil sealed between the first reversing device and the combined hydraulic reversing valve is discharged back to the oil tank through the check valve III and the combined hydraulic reversing valve in sequence. When the second reversing device is disconnected, the hydraulic oil sealed between the second reversing device and the combined hydraulic reversing valve is discharged back to the oil tank through the check valve II and the combined hydraulic reversing valve in sequence.

4. The rotary cylinder mechanical hydraulic reversing circuit according to claim 1, characterized in that: The outlet of the variable pump is equipped with a flow meter for monitoring the specific position of the drive cylinder.

5. A mechanical hydraulic reversing method using a rotary cylinder, characterized in that, Includes the following steps: Step 1: The motor drives the variable pump to drive the hydraulic oil from the oil tank through the combined hydraulic directional valve, through oil circuit A to the rod chamber of the active cylinder, and pushes the piston rod of the active cylinder to move. Step 2: When the piston rod of the active cylinder moves to the bottom of the rodless chamber, the piston triggers the second reversing device. The second reversing device controls the combined hydraulic reversing valve to switch, thereby realizing the high and low pressure switching of the A and B oil circuits of the combined hydraulic reversing valve once. The B oil circuit starts to receive high pressure oil, and the A oil circuit returns oil. Step 3: After switching, the high-pressure oil flows along oil circuit B to the rodless chamber of the active cylinder, pushing the piston rod of the active cylinder to extend. At the same time, the second reversing device is disconnected, and the high-pressure oil sealed between the second reversing device and the combined hydraulic reversing valve is depressurized through check valve II. Step 4: After the piston rod of the active cylinder extends to the bottom of the chamber, the piston triggers the first reversing device. The first reversing device controls the combined hydraulic reversing valve to switch directions. The high and low pressure of the A and B oil circuits of the combined hydraulic reversing valve are switched again. High pressure oil starts to enter the A oil circuit, and oil returns to the B oil circuit. Step 5: After switching, the high-pressure oil circulates along the direction of oil circuit A, repeating the route of step 1, while the first reversing device is disconnected; the high-pressure oil sealed between the first reversing device and the combined hydraulic reversing valve is depressurized through check valve III. During the movement of the active cylinder, the driven cylinder passively follows the active cylinder and moves together.

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