Lifting loop, oil cylinder overpressure protection loop and explosion-proof control loop of power catwalk

Abstract

The invention discloses a power catwalk lifting and releasing loop, an oil cylinder overpressure protection loop and an anti-explosion control loop, the power catwalk lifting and releasing loop comprises a multi-way valve, a motor, a first bidirectional balance valve, a second bidirectional balance valve, a first lifting and releasing oil cylinder and a second lifting and releasing oil cylinder, the multi-way valve is used for controlling the flow direction of hydraulic oil, and the motor is a driving device of the hydraulic oil. The first two-way balance valve enables the first lifting and releasing oil cylinder to move stably, the second two-way balance valve enables the second lifting and releasing oil cylinder to move stably, and the first lifting and releasing oil cylinder passes through the first two-way balance valve, the first lifting and releasing oil cylinder and the motor from the multi-way valve and then returns to the multi-way valve to form a first lifting and releasing loop. The hydraulic lifting and releasing system has the beneficial effects that the multi-way valve enables the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder to stretch out and draw back synchronously, and the motor enables the stretching speed of the first lifting and releasing oil cylinder and the stretching speed of the second lifting and releasing oil cylinder to be controlled; the rotating arm and the drilling tool supporting beam can stably work in the lifting and lowering process.

Description

Technical Field

[0001] The invention relates to the technical field of power catwalks, and in particular to a starting and lowering circuit, an oil cylinder overpressure protection circuit and an explosion-proof control circuit of a power catwalk. Background Art

[0002] The power catwalk is a conveying device used in the field of oil and gas drilling equipment technology. It can convey the drilling tools on the legs (legs can also be called racks) on both sides of the power catwalk to the drilling floor, and can also convey the drilling tools on the drilling floor to the legs on both sides of the power catwalk. The main drive system of the power catwalk is a drive system used to raise and lower the power catwalk beam (the power catwalk beam can also be called a V-shaped drilling tool support beam). The up and down movement of the pulley of the main drive system can drive the lifting of the power catwalk beam.

[0003] The typical structure of a power catwalk is: including a ramp, a base, a cloud beam, a swing arm, a leg and a main drive system, wherein: the lower end of the ramp is connected to the front end of the base, the legs are arranged on both sides of the base, the front end of the cloud beam is matched with the front face of the ramp and can move up and down along the front face of the ramp, the cloud beam can be matched with the base, and the cloud beam can also be extended to the upper end of the ramp, one end of the swing arm is movably connected to the rear end position of the cloud beam, and the other end of the swing arm is movably connected to the base. The cloud beam can be driven up and down along the ramp through the main drive system to realize the conveying action of the drilling tool.

[0004] The main drive system is distributed on both sides of the base. During the process of raising and lowering the drilling tool support beam, if the extension (retraction) of the two cylinders deviates and the two cylinders are out of sync, the boom and support frame will overturn, causing serious accidents. Therefore, during the process of raising and lowering the drilling tool support beam and the boom, the synchronous extension and retraction of the cylinders on both sides must be ensured.

[0005] During the lifting and lowering of the jib and drill support beam, the load is constantly changing as the motion trajectory changes. The speed needs to be reduced in the heavy load section to maintain smooth movement, and the speed needs to be increased in the light load section to improve efficiency. Summary of the invention

[0006] The technical problem to be solved by the present invention is how to achieve smooth operation of the jib and the drill tool support beam during the lifting and lowering process. The purpose of the present invention is to provide a lifting and lowering circuit, a cylinder overpressure protection circuit and an explosion-proof control circuit for the power catwalk. The multi-way valve enables the first lifting and lowering cylinder and the second lifting and lowering cylinder to be extended and retracted, and the motor controls the extension and retraction speed of the first lifting and lowering cylinder and the second lifting and lowering cylinder. The first lifting and lowering cylinder and the second lifting and lowering cylinder are extended and retracted synchronously, and the jib and the drill tool support beam can work smoothly during the lifting and lowering process.

[0007] The present invention is achieved through the following technical solutions:

[0008] The launching and lowering circuit of the powered catwalk includes:

[0009] A multi-way valve, wherein the multi-way valve is used to control the flow direction of the hydraulic oil;

[0010] A motor, which is a driving device for hydraulic oil;

[0011] a first two-way balancing valve, wherein the first two-way balancing valve can make the first lifting and lowering oil cylinder move smoothly;

[0012] a second two-way balancing valve, the second two-way balancing valve being capable of making the second lifting and lowering oil cylinder move smoothly;

[0013] From the multi-way valve through the first two-way balancing valve, the first lifting and lowering cylinder and the motor, it returns to the multi-way valve to form a first lifting and lowering circuit;

[0014] The second lifting and lowering circuit is formed by passing from the multi-way valve through the second two-way balancing valve, the second lifting and lowering cylinder and the motor and then returning to the multi-way valve;

[0015] The multi-way valve is controlled to change the flow direction of the hydraulic oil to control the extension and retraction of the first lifting cylinder and the second lifting cylinder. The motor drives the hydraulic oil to control the extension and retraction speed of the first lifting cylinder and the second lifting cylinder to achieve synchronous extension and retraction of the first lifting cylinder and the second lifting cylinder.

[0016] Optionally, the multi-way valve includes a first valve, a second valve and a third valve;

[0017] The A1 port of the first valve, the A2 port of the second valve, and the A3 port of the third valve are all connected to the A1 port of the first oil lifting and releasing cylinder, and the A1 port of the first valve, the A2 port of the second valve, and the A3 port of the third valve are all connected to the A2 port of the second oil lifting and releasing cylinder;

[0018] The B1 port of the first valve is connected to one end of the first throttle valve, and the other end of the first throttle valve is connected to the inlet of the motor;

[0019] The B2 port of the second valve is connected to one end of the second throttle valve, and the other end of the second throttle valve is connected to the outlet C1 of the motor;

[0020] The B3 port of the third valve is connected to one end of the third throttle valve, and the other end of the third throttle valve is connected to the outlet C2 of the motor.

[0021] Optionally, the outlet C1 of the motor is connected to the port B1 of the first lifting cylinder, and the outlet C2 of the motor is connected to the port B2 of the second lifting cylinder.

[0022] Optionally, the first lifting and releasing oil cylinder is connected to a first overflow valve, and the second lifting and releasing oil cylinder is connected to a second overflow valve.

[0023] Optionally, the multi-way valve, the motor, the first lifting and lowering oil cylinder and the second lifting and lowering oil cylinder form a lifting and lowering circuit of the power catwalk;

[0024] The multi-way valve comprises a first valve, a second valve and a third valve;

[0025] The first valve controls the synchronous extension and retraction of the first lifting cylinder and the second lifting cylinder through the motor, so that the extension and retraction speeds of the first lifting cylinder and the second lifting cylinder are the same; the second valve is used to control the extension and retraction of the first lifting cylinder; and the third valve is used to control the extension and retraction of the second lifting cylinder;

[0026] The first valve is provided with a handle, and the operating direction of the handle is an upper position and a lower position. When the handle is operated to the upper position, high-pressure oil flows out from the B port, and when the handle is operated to the lower position, high-pressure oil flows out from the A port.

[0027] When the handle of the first valve is operated to the upper position, the hydraulic oil in the first lifting and releasing cylinder flows out from the B1 port, passes through the first throttle valve and the motor, and then flows out from the outlet C1 and the outlet C2 of the motor respectively. The hydraulic oil respectively enters the B1 port of the first lifting and releasing cylinder and the B2 port of the second lifting and releasing cylinder, so that the flow rates entering the first lifting and releasing cylinder and the second lifting and releasing cylinder are consistent, thereby realizing the synchronous extension and retraction of the first lifting and releasing cylinder and the second lifting and releasing cylinder.

[0028] Optionally, the A1 port of the first lifting and releasing oil cylinder and the A2 port of the second lifting and releasing oil cylinder are connected to the A1 port of the first valve, and the hydraulic oil flows out from the A1 port of the first lifting and releasing oil cylinder and the A2 port of the second lifting and releasing oil cylinder respectively, and the outflowing hydraulic oil finally flows back to the oil tank, and the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder can be extended and retracted synchronously.

[0029] Optionally, the A1 port of the first valve is connected to the A1 port of the first oil lifting cylinder and the A2 port of the second oil lifting cylinder;

[0030] When the handle of the first valve is operated to the lower position, the hydraulic oil flows out from the A1 port of the first valve, passes through the A1 port of the first lifting and releasing oil cylinder and the A2 port of the second lifting and releasing oil cylinder, so that the hydraulic oil at the B1 port of the first lifting and releasing oil cylinder and the B2 port of the second lifting and releasing oil cylinder respectively enter the C1 port and the C2 port of the motor to ensure that the flow rate of the hydraulic oil flowing out of the B1 port of the first lifting and releasing oil cylinder and the B2 port of the second lifting and releasing oil cylinder is consistent, and the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder can be extended and retracted synchronously.

[0031] Optionally, the B1 port of the first lifting and lowering oil cylinder and the B2 port of the second lifting and lowering oil cylinder are connected to the motor;

[0032] The hydraulic oil at the B1 port of the first lifting cylinder and the B2 port of the second lifting cylinder flow through the motor synchronously, the flow rate of the hydraulic oil flowing out of the first lifting cylinder and the second lifting cylinder is consistent, the first lifting cylinder and the second lifting cylinder extend synchronously, and are connected to the B1 port of the first valve through the throttle valve, and the hydraulic oil finally flows back to the oil tank. The throttle valve is used for speed control of the synchronous extension and retraction of the first lifting cylinder and the second lifting cylinder.

[0033] The cylinder overpressure protection circuit of the power catwalk includes:

[0034] A first relief valve, the first relief valve is connected to the first lifting and lowering oil cylinder, and the first relief valve has a T port;

[0035] a second relief valve, the second relief valve being connected to the second lifting and lowering oil cylinder, and the second relief valve having the T port;

[0036] The T port of the first relief valve and the T port of the second relief valve can be opened, or the first relief valve and the second relief valve can be led to the ground through pipelines;

[0037] During the extension and retraction process of the first lifting cylinder and the second lifting cylinder, when obstruction occurs inside the lifting and lowering circuit of the entire power catwalk, pressure will be accumulated in the first lifting cylinder and the second lifting cylinder. If the pressure exceeds the safety pressure threshold of the first relief valve and / or the second relief valve, the first relief valve and / or the second relief valve will open, and oil will flow out of the open T-port or the pipeline leading to the ground, thereby realizing overpressure protection of the first lifting cylinder and / or the second lifting cylinder.

[0038] The explosion-proof control circuit of the power catwalk includes: a first two-way balancing valve, a second two-way balancing valve, a first lifting and lowering oil cylinder and a second lifting and lowering oil cylinder;

[0039] The first two-way balancing valve is configured with the first lifting and releasing oil cylinder, and the first two-way balancing valve is used to lock the hydraulic oil in the first lifting and releasing oil cylinder;

[0040] The second two-way balancing valve is configured with the second lifting and releasing oil cylinder, and the second two-way balancing valve is used to lock the hydraulic oil in the second lifting and releasing oil cylinder.

[0041] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0042] 1. The multi-way valve of the present invention passes through the first two-way balancing valve, the first lifting and lowering cylinder and the motor and then returns to the multi-way valve to form a first lifting and lowering circuit. The multi-way valve passes through the second two-way balancing valve, the second lifting and lowering cylinder and the motor and then returns to the multi-way valve to form a second lifting and lowering circuit. The multi-way valve is controlled to change the flow direction of the hydraulic oil to control the extension and retraction of the first lifting and lowering cylinder and the second lifting and lowering cylinder. The motor drives the hydraulic oil to control the extension and retraction speed of the first lifting and lowering cylinder and the second lifting and lowering cylinder. The first lifting and lowering cylinder and the second lifting and lowering cylinder are synchronously extended and retracted. The multi-way valve of the present invention enables the first lifting and lowering cylinder and the second lifting and lowering cylinder to be extended and retracted, and the motor controls the extension and retraction speed of the first lifting and lowering cylinder and the first lifting and lowering cylinder to be synchronously extended and retracted. The jib (controlled by the extension and retraction of the first lifting and lowering cylinder) and the drilling tool support beam (controlled by the extension and retraction of the second lifting and lowering cylinder) can work smoothly during the lifting and lowering process.

[0043] 2. The first valve of the present invention controls the synchronous extension and retraction of the first lifting cylinder and the second lifting cylinder through a motor, so that the extension and retraction speeds of the first lifting cylinder and the second lifting cylinder are the same; the second valve is used to control the extension and retraction of the first lifting cylinder; and the third valve is used to control the extension and retraction of the second lifting cylinder.

[0044] 3. When the first valve of the present invention is operated to the upper position, the hydraulic oil in the first lifting cylinder flows out from the B1 port, passes through the first throttle valve and the motor, and then flows out from the motor outlet C1 and outlet C2 respectively. The hydraulic oil enters the B1 port of the first lifting cylinder and the B2 port of the second lifting cylinder respectively, so that the flow rates entering the first lifting cylinder and the second lifting cylinder are consistent, thereby realizing the synchronous retraction or lowering of the first lifting cylinder and the second lifting cylinder. The A1 port of the first lifting cylinder and the A2 port of the second lifting cylinder are connected to the A1 port of the first valve, and the hydraulic oil flows out from the A1 port of the first lifting cylinder and the A2 port of the second lifting cylinder respectively. The outflowing hydraulic oil finally flows back to the oil tank, and the first lifting cylinder and the second lifting cylinder can be retracted or lowered synchronously.

[0045] 4. When the first valve of the present invention is operated to the lower position, the hydraulic oil flows out from the A1 port of the first lifting and releasing cylinder and from the A2 port of the second lifting and releasing cylinder. A motor is configured at the B1 port of the first lifting and releasing cylinder and the B2 port of the first lifting and releasing cylinder, so that the rod chambers B1 port and B2 port of the two lifting and releasing cylinders enter the C1 port and C2 port of the motor respectively, so as to ensure that the flow rate flowing out of the B1 port and B2 port of the two lifting and releasing cylinders is consistent, thus ensuring that the two cylinders are extended synchronously. The hydraulic oil in the rod chambers of the two lifting and releasing cylinders flows out from the B1 and B2 ports and flows through the motor, so the outflow flow rate of the rod chambers of the two lifting and releasing cylinders is consistent, and the two cylinders are extended synchronously. At the same time, they are connected to the B1 port of the first valve of the multi-way valve through the first throttle valve and finally flow back to the oil tank, and the speed control of synchronous lifting is realized through the first throttle valve.

[0046] 5. The first relief valve of the present invention is connected to the first lifting and releasing cylinder, and the first relief valve has a T port. The second relief valve is connected to the second lifting and releasing cylinder, and the second relief valve has a T port. The T port of the first relief valve and the T port of the second relief valve can be opened, or the first relief valve and the second relief valve are led to the ground through pipelines; during the lifting and releasing process of the first lifting and releasing cylinder and the second lifting and releasing cylinder, a blockage occurs inside the lifting and releasing circuit of the entire power catwalk, resulting in pressure buildup in the first lifting and releasing cylinder and the second lifting and releasing cylinder. If the pressure exceeds the safety setting pressure of the T port of the first relief valve and the second relief valve, the first relief valve and the second relief valve open, and oil will flow out of the open T port or the pipeline leading to the ground, thereby realizing overpressure protection of the first lifting and releasing cylinder and the second lifting and releasing cylinder.

[0047] 6. The first two-way balancing valve of the present invention is configured with the first lifting and releasing oil cylinder, and the second two-way balancing valve is configured with the second lifting and releasing oil cylinder. The rod chamber and the rodless chamber of the first lifting and releasing oil cylinder are configured with the first two-way balancing valve, and the rod chamber and the rodless chamber of the second lifting and releasing oil cylinder are configured with the second two-way balancing valve. When the inlet and outlet oil pipelines of the two lifting and releasing oil cylinders suddenly burst or disconnect, there is no oil supply at this time, and the two lifting and releasing oil cylinders will stall and overturn under the action of load. The two-way balancing valve can lock the oil in the two chambers of the two lifting and releasing oil cylinders when there is no oil supply to ensure that the lifting and releasing oil cylinders maintain the current state. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0049] Figure 1 It is a schematic diagram of the hydraulic control principle of the lifting and lowering mechanism of the present invention.

[0050] Marks and corresponding parts names in the attached drawings:

[0051] 1-multi-way valve, 1.1-first valve, 1.2-second valve, 1.3-third valve, 2.1-first throttle valve, 2.2-second throttle valve, 2.3-third throttle valve, 3-motor, 4.1-first two-way balancing valve, 4.2-second two-way balancing valve, 5.1-first overflow valve, 5.2-second overflow valve, 6.1-first lifting and releasing cylinder, 6.2-second lifting and releasing cylinder. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0053] Example 1

[0054] like Figure 1 As shown, this embodiment provides a lifting and lowering circuit of a power catwalk, comprising: a multi-way valve 1, a motor 3, a first two-way balancing valve 4.1, a second two-way balancing valve 4.2, a first lifting and lowering oil cylinder 6.1 and a second lifting and lowering oil cylinder 6.2, wherein the multi-way valve 1 is used to control the flow direction of the hydraulic oil, the motor 3 itself is a driving device for the hydraulic oil, the first two-way balancing valve 4.1 can make the first lifting and lowering oil cylinder 6.1 move smoothly, and the second two-way balancing valve 4.2 can make the second lifting and lowering oil cylinder 6.2 move smoothly;

[0055] The first lifting and releasing circuit is formed after the multi-way valve 1 passes through the first two-way balancing valve 4.1, the first lifting and releasing cylinder 6.1 and the motor 3 and then returns to the multi-way valve 1; the second lifting and releasing circuit is formed after the multi-way valve 1 passes through the second two-way balancing valve 4.2, the second lifting and releasing cylinder 6.2 and the motor 3 and then returns to the multi-way valve 1;

[0056] The flow direction of the hydraulic oil is changed by controlling the multi-way valve 1 to control the extension and retraction of the first lifting cylinder 6.1 and the second lifting cylinder 6.2. The extension and retraction speed of the first lifting cylinder 6.1 and the second lifting cylinder 6.2 can be controlled by driving the hydraulic oil through the motor 3. The first lifting cylinder 6.1 and the second lifting cylinder 6.2 are extended and retracted synchronously.

[0057] Specifically, the multi-way valve 1 comprises a first valve 1.1, a second valve 1.2 and a third valve 1.3;

[0058] The A1 port of the first valve 1.1, the A2 port of the second valve 1.2 and the A3 port of the third valve 1.3 are all connected to the A1 port of the first oil lifting cylinder 6.1, and the A1 port of the first valve 1.1, the A2 port of the second valve 1.2 and the A3 port of the third valve 1.3 are all connected to the A2 port of the second oil lifting cylinder 6.2;

[0059] The B1 port of the first valve 1.1 is connected to one end of the first throttle valve 2.1, and the other end of the first throttle valve 2.1 is connected to the inlet of the motor 3; the B2 port of the second valve 1.2 is connected to one end of the second throttle valve 2.2, and the other end of the second throttle valve 2.2 is connected to the outlet C1 of the motor 3; the B3 port of the third valve 1.3 is connected to one end of the third throttle valve 2.3, and the other end of the third throttle valve 2.3 is connected to the outlet C2 of the motor 3.

[0060] The outlet C1 of the motor 3 is connected to the B1 port of the first lifting and lowering cylinder 6.1, and the outlet C2 of the motor 3 is connected to the B2 port of the second lifting and lowering cylinder 6.2.

[0061] The first lifting cylinder 6.1 is connected to the first overflow valve 5.1, and the second lifting cylinder 6.2 is connected to the second overflow valve 5.2.

[0062] Furthermore, the multi-way valve 1, the motor 3, the first lifting and lowering oil cylinder 6.1 and the second lifting and lowering oil cylinder 6.2 form a lifting and lowering circuit of the power catwalk;

[0063] The multi-way valve 1 comprises a first valve 1.1, a second valve 1.2 and a third valve 1.3;

[0064] The first valve 1.1 controls the synchronous extension and retraction of the first lifting and releasing oil cylinder 6.1 and the second lifting and releasing oil cylinder 6.2 through the motor 3, so that the extension and retraction speeds of the first lifting and releasing oil cylinder 6.1 and the second lifting and releasing oil cylinder 6.2 are the same; the second valve 1.2 is used to control the extension and retraction of the first lifting and releasing oil cylinder 6.1, and the third valve 1.3 is used to control the extension and retraction of the second lifting and releasing oil cylinder 6.2;

[0065] When the first valve 1.1 is operated to the upper position, the hydraulic oil in the first lifting cylinder 6.1 flows out from the B1 port, passes through the first throttle valve 2.1 and the motor 3, and then flows out from the outlet C1 and the outlet C2 of the motor 3 respectively, and enters the B1 port of the first lifting cylinder 6.1 and the B2 port of the second lifting cylinder 6.2 respectively, so that the flow rates entering the first lifting cylinder 6.1 and the second lifting cylinder 6.2 are consistent, thereby realizing the synchronous retraction or lowering of the first lifting cylinder 6.1 and the second lifting cylinder 6.2.

[0066] The A1 port of the first lifting cylinder 6.1 and the A2 port of the second lifting cylinder 6.2 are connected to the A1 port of the first valve 1.1, and the hydraulic oil flows out from the A1 port of the first lifting cylinder 6.1 and the A2 port of the second lifting cylinder 6.2 respectively, and the outflowing hydraulic oil finally flows back to the oil tank, and the first lifting cylinder 6.1 and the second lifting cylinder 6.2 can be extended and retracted synchronously.

[0067] The A1 port of the first valve 1.1 is connected to the A1 port of the first oil lifting cylinder 6.1 and the A2 port of the second oil lifting cylinder 6.2;

[0068] When the first valve 1.1 is operated to the lower position, the hydraulic oil flows out from the A1 port of the first valve 1.1, passes through the A1 port of the first lifting and releasing oil cylinder 6.1 and the A2 port of the second lifting and releasing oil cylinder 6.2, so that the hydraulic oil at the B1 port of the first lifting and releasing oil cylinder 6.1 and the B2 port of the second lifting and releasing oil cylinder 6.2 enter the C1 port and the C2 port of the motor 3 respectively, so as to ensure that the flow rate of the hydraulic oil flowing out from the B1 port of the first lifting and releasing oil cylinder 6.1 and the B2 port of the second lifting and releasing oil cylinder 6.2 is consistent, and the first lifting and releasing oil cylinder 6.1 and the second lifting and releasing oil cylinder 6.2 can be extended and retracted synchronously.

[0069] The B1 port of the first lifting cylinder 6.1 and the B2 port of the second lifting cylinder 6.2 are connected to the motor 3;

[0070] The hydraulic oil from the B1 port of the first lifting cylinder 6.1 and the B2 port of the second lifting cylinder 6.2 flow synchronously through the motor 3, and the flow rate of the hydraulic oil flowing out of the first lifting cylinder 6.1 and the second lifting cylinder 6.2 is consistent. The first lifting cylinder 6.1 and the second lifting cylinder 6.2 extend synchronously and are connected to the B1 port of the first valve 1.1 through the throttle valve 2.1. The hydraulic oil finally flows back to the oil tank. The throttle valve 2.1 is used for speed control of the synchronous extension and retraction of the first lifting cylinder 6.1 and the second lifting cylinder 6.2.

[0071] The A1 port, A2 port and A3 port of the multi-way valve 1 of the present embodiment are connected in series and are connected to the A1 port of the first oil lifting cylinder 6.1 and the A2 port of the second oil lifting cylinder 6.2; the B1 port of the multi-way valve 1 is connected to the inlet of the first throttle valve 2.1, the B2 port of the multi-way valve 1 is connected to the inlet of the second throttle valve 2.2, the B3 port of the multi-way valve 1 is connected to the inlet of the third throttle valve 2.3, the outlet of the first throttle valve 2.1 is connected to the inlet of the motor 3, the outlet of the second throttle valve 2.2 is connected to the outlet C1 of the motor 3, the outlet of the third throttle valve 2.3 is connected to the outlet C2 of the motor 3, the outlet C1 of the motor 3 is connected to the B1 port of the first oil lifting cylinder 6.1, and the outlet C2 of the motor 3 is connected to the B2 port of the second oil lifting cylinder 6.2.

[0072] Integrated valve blocks are installed on the bodies of the first and second lifting cylinders 6.1 and 6.2, respectively, and the first and second two-way balancing valves 4.1 and 4.2 are installed on the integrated valve blocks, respectively. The first and second overflow valves 5.1 and 5.2 are connected to the rod chambers of the first and second lifting cylinders 6.1 and 6.2, respectively.

[0073] In this embodiment, the multi-way valve 1 is used to change the flow direction of the hydraulic oil to control the extension and retraction of the two lifting and releasing cylinders, and the motor 3 is used to evenly distribute the flow of the hydraulic oil in and out of the two lifting and releasing cylinders to achieve synchronous extension and retraction of the two lifting and releasing cylinders.

[0074] The first valve 1.1 controls the synchronous raising and lowering of the two oil raising and lowering cylinders, the second valve 1.2 controls the first oil raising and lowering cylinder 6.1, and the third valve 1.3 controls the second oil raising and lowering cylinder 6.2.

[0075] Operate the first valve 1.1 to the upper position, the hydraulic oil flows out from the B1 port of the first lifting and releasing cylinder 6.1, passes through the first throttle valve 2.1, and is evenly divided by the motor 3, and then flows out from the outlets C1 and C2 of the motor 3 respectively. The evenly divided hydraulic oil enters the B1 port of the first lifting and releasing cylinder 6.1 and the B2 port of the second lifting and releasing cylinder 6.2 respectively, so that the flow entering the rod chambers of the two lifting and releasing cylinders is consistent, thereby realizing the synchronous extension and retraction of the two lifting and releasing cylinders. However, since the loads on both sides of the structure cannot be guaranteed to be completely consistent at all times, under the action of gravity, the side with heavier load will theoretically retract faster, and the greater the flow entering from the two B ports of the two lifting and releasing cylinders. At this time, in order to ensure that the flow entering the rod chambers of the two lifting and releasing cylinders is consistent, it is necessary to operate the operating valve corresponding to the side with heavier load separately to replenish the oil in the rod chamber of the lifting and releasing cylinder on that side. At the same time, the hydraulic oil in the rodless chamber of the lifting and lowering cylinder flows out from the A1 and A2 ports and connects to the A1 port of the first valve 1.1 of the multi-way valve group 1 and finally flows back to the oil tank. At this time, the two cylinders extend and retract synchronously.

[0076] Operate the first valve 1.1 to the lower position, the hydraulic oil flows out from the A1 port of the first lifting and releasing cylinder 6.1 and from the A2 port of the second lifting and releasing cylinder 6.2, and the motor 3 is arranged at the B1 port of the first lifting and releasing cylinder 6.1 and the B2 port of the first lifting and releasing cylinder 6.2, so that the rod chambers B1 port and B2 port of the two lifting and releasing cylinders enter the C1 port and C2 port of the motor 3 respectively, so as to ensure that the flow rates flowing out of the B1 port and B2 port of the two lifting and releasing cylinders are consistent, thereby ensuring the synchronous extension and retraction of the two cylinders.

[0077] However, since the loads on both sides of the structure cannot be guaranteed to be completely consistent at all times, during the extension and retraction process, the side with lighter load will theoretically extend faster, and the hydraulic oil in the rod chamber of the cylinder will flow out from the B1 and B2 ports and flow through the motor 3. Therefore, the outflow rate of the rod chambers of the two lifting and lowering cylinders is consistent, and the two cylinders are extended synchronously. At the same time, they are connected to the B1 port of the first valve 1.1 of the multi-way valve 1 through the first throttle valve 2.1 and finally flow back to the oil tank, and the speed control of synchronous extension and retraction is realized through the first throttle valve 2.1.

[0078] The second valve 1.2 is used in conjunction with the second throttle valve 2.2 to compensate for the telescopic action of the first lifting and releasing cylinder 6.1 when an unbalanced load occurs; the third valve 1.3 is used in conjunction with the third throttle valve 2.3 to compensate for the telescopic action of the second lifting and releasing cylinder 6.2 when an unbalanced load occurs.

[0079] Example 2

[0080] Based on Example 1, Figure 1As shown, this embodiment provides an oil cylinder overpressure protection circuit for a power catwalk, comprising: a first relief valve 5.1 and a second relief valve 5.2.

[0081] The first relief valve 5.1 is connected to the first lifting and lowering oil cylinder 6.1, and the first relief valve 5.1 has a T port;

[0082] The second relief valve 5.2 is connected to the second lifting and lowering oil cylinder 6.2, and the second relief valve 5.2 has a T port;

[0083] The T port of the first relief valve 5.1 and the T port of the second relief valve 5.2 can be opened, or the first relief valve 5.1 and the second relief valve 5.2 can be led to the ground through pipelines;

[0084] During the extension and retraction process of the first lifting cylinder 6.1 and the second lifting cylinder 6.2, when obstruction occurs inside the lifting and lowering circuit of the entire power catwalk, pressure will be accumulated in the first lifting cylinder 6.1 and the second lifting cylinder 6.2. If the pressure exceeds the safety pressure threshold of the T port of the first relief valve 5.1 and / or the second relief valve 5.2, the first relief valve 5.1 and / or the second relief valve 5.2 will open, and oil will flow out of the open T port or the pipeline leading to the ground, thereby realizing overpressure protection of the first lifting cylinder 6.1 and / or the second lifting cylinder 6.2.

[0085] It should be noted here that the rod cavity side of the two lifting and lowering cylinders is respectively provided with a first relief valve 5.1 and a second relief valve 5.2, and the T-ports of the two relief valves are open or led to the ground through pipelines for easy observation. When in the lifting and lowering process, the structure of the lifting and lowering circuit of the power catwalk is blocked, resulting in pressure buildup in the two cylinders. If the pressure exceeds the safety setting pressure of the relief valve (safety valve), the two relief valves open, and oil will flow out of the open T-port or the leading pipeline, thereby realizing overpressure protection for the two cylinders. At the same time, the operator can judge the failure of the lifting and lowering process through this phenomenon, and thus suspend the operation to troubleshoot.

[0086] Example 3

[0087] Based on Example 1, Figure 1 As shown, this embodiment provides an explosion-proof control circuit for a power catwalk, including: a first two-way balancing valve 4.1, a second two-way balancing valve 4.2, a first lifting and lowering oil cylinder 6.1 and a second lifting and lowering oil cylinder 6.2;

[0088] The first two-way balancing valve 4.1 is configured with the first lifting and lowering oil cylinder 6.1, and the first two-way balancing valve 4.1 is used to lock the hydraulic oil in the first lifting and lowering oil cylinder 6.1;

[0089] The second two-way balancing valve 4.2 is configured with the second lifting and releasing oil cylinder 6.2. The second two-way balancing valve 4.2 is used to lock the hydraulic oil in the second lifting and releasing oil cylinder 6.2.

[0090] Specifically, the rod chamber and rodless chamber of the first lifting and releasing cylinder 6.1 are equipped with a first two-way balancing valve 4.1, and the rod chamber and rodless chamber of the second lifting and releasing cylinder 6.2 are equipped with a second two-way balancing valve 4.2. When the inlet and outlet oil pipelines of the two lifting and releasing cylinders suddenly burst or become detached, there is no oil supply, and the two lifting and releasing cylinders may stall and overturn under the action of load. When there is no oil supply, the two-way balancing valve can lock the oil in the two chambers of the two lifting and releasing cylinders to ensure that the lifting and releasing cylinders maintain the current state.

[0091] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The starting and lowering circuit of the power catwalk is characterized by: include: A multi-way valve (1), wherein the multi-way valve (1) is used to control the flow direction of hydraulic oil; A motor (3), wherein the motor (3) itself is a driving device for hydraulic oil; A first two-way balancing valve (4.1), wherein the first two-way balancing valve (4.1) is capable of making the first lifting and lowering oil cylinder (6.1) move smoothly; A second two-way balancing valve (4.2), wherein the second two-way balancing valve (4.2) can enable the second oil lifting cylinder (6.2) to move smoothly; The oil passes through the first two-way balancing valve (4.1), the first lifting and lowering oil cylinder (6.1) and the motor (3), and then returns to the multi-way valve (1) to form a first lifting and lowering circuit; The oil passes through the second two-way balancing valve (4.2), the second lifting and lowering oil cylinder (6.2) and the motor (3) and then returns to the multi-way valve (1) to form a second lifting and lowering circuit; The multi-way valve (1) is controlled to change the flow direction of the hydraulic oil to control the extension and retraction of the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2); the motor (3) drives the hydraulic oil to control the extension and retraction speed of the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2), thereby achieving synchronous extension and retraction of the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2).

2. The starting and lowering circuit of the powered catwalk according to claim 1, characterized in that: The multi-way valve (1) comprises a first valve (1.1), a second valve (1.2) and a third valve (1.3); The A1 port of the first valve (1.1), the A2 port of the second valve (1.2), and the A3 port of the third valve (1.3) are all connected to the A1 port of the first oil lifting cylinder (6.1); the A1 port of the first valve (1.1), the A2 port of the second valve (1.2), and the A3 port of the third valve (1.3) are all connected to the A2 port of the second oil lifting cylinder (6.2); The B1 port of the first valve (1.1) is connected to one end of the first throttle valve (2.1), and the other end of the first throttle valve (2.1) is connected to the inlet of the motor (3); The B2 port of the second valve (1.2) is connected to one end of the second throttle valve (2.2), and the other end of the second throttle valve (2.2) is connected to the outlet C1 of the motor (3); The B3 port of the third plate valve (1.3) is connected to one end of the third throttle valve (2.3), and the other end of the third throttle valve (2.3) is connected to the outlet C2 of the motor (3).

3. The starting and lowering circuit of the powered catwalk according to claim 2, characterized in that: The outlet C1 of the motor (3) is connected to the B1 port of the first oil lifting cylinder (6.1), and the outlet C2 of the motor (3) is connected to the B2 port of the second oil lifting cylinder (6.2).

4. The starting and lowering circuit of the powered catwalk according to claim 1, characterized in that: The first oil lifting cylinder (6.1) is connected to a first overflow valve (5.1), and the second oil lifting cylinder (6.2) is connected to a second overflow valve (5.2).

5. The starting and lowering circuit of the powered catwalk according to claim 1, characterized in that: The multi-way valve (1), the motor (3), the first lifting and lowering oil cylinder (6.1) and the second lifting and lowering oil cylinder (6.2) form a lifting and lowering circuit of the power catwalk; The multi-way valve (1) comprises a first valve (1.1), a second valve (1.2) and a third valve (1.3); The first valve (1.1) controls the synchronous extension and retraction of the first oil lifting cylinder (6.1) and the second oil lifting cylinder (6.2) through the motor (3), so that the extension and retraction speeds of the first oil lifting cylinder (6.1) and the second oil lifting cylinder (6.2) are the same; the second valve (1.2) is used to control the extension and retraction of the first oil lifting cylinder (6.1); and the third valve (1.3) is used to control the extension and retraction of the second oil lifting cylinder (6.2); When the first valve (1.1) is operated to the upper position, the hydraulic oil in the first lifting and releasing oil cylinder (6.1) flows out from the B1 port, passes through the first throttle valve (2.1) and the motor (3), and then flows out from the outlet C1 and outlet C2 of the motor (3) respectively, and enters the B1 port of the first lifting and releasing oil cylinder (6.1) and the B2 port of the second lifting and releasing oil cylinder (6.2) respectively, so that the flow rates entering the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2) are consistent, thereby realizing the synchronous extension and retraction of the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2).

6. The starting and lowering circuit of the powered catwalk according to claim 5, characterized in that: The A1 port of the first lifting and releasing oil cylinder (6.1) and the A2 port of the second lifting and releasing oil cylinder (6.2) are connected to the A1 port of the first valve (1.1); hydraulic oil flows out from the A1 port of the first lifting and releasing oil cylinder (6.1) and the A2 port of the second lifting and releasing oil cylinder (6.2) respectively; the hydraulic oil flows out eventually back to the oil tank; the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2) can be extended and retracted synchronously.

7. The starting and lowering circuit of the powered catwalk according to claim 5, characterized in that: The A1 port of the first valve (1.1) is in communication with the A1 port of the first oil lifting and releasing cylinder (6.1) and the A2 port of the second oil lifting and releasing cylinder (6.2); When the first valve (1.1) is operated to the lower position, hydraulic oil flows out from the A1 port of the first valve (1.1), passes through the A1 port of the first lifting and releasing oil cylinder (6.1) and the A2 port of the second lifting and releasing oil cylinder (6.2), so that the hydraulic oil at the B1 port of the first lifting and releasing oil cylinder (6.1) and the B2 port of the second lifting and releasing oil cylinder (6.2) respectively enter the C1 port and the C2 port of the motor (3), so as to ensure that the flow rate of the hydraulic oil flowing out of the B1 port of the first lifting and releasing oil cylinder (6.1) and the B2 port of the second lifting and releasing oil cylinder (6.2) is consistent, and the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2) can be extended and retracted synchronously.

8. The starting and lowering circuit of the powered catwalk according to claim 7, characterized in that: The B1 port of the first oil lifting and lowering cylinder (6.1) and the B2 port of the second oil lifting and lowering cylinder (6.2) are connected to the motor (3); The hydraulic oil at the B1 port of the first lifting and releasing oil cylinder (6.1) and the B2 port of the second lifting and releasing oil cylinder (6.2) flows synchronously through the motor (3); the flow rates of the hydraulic oil flowing out of the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2) are consistent; the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2) extend synchronously and are connected to the B1 port of the first valve (1.1) through the throttle valve (2.1); the hydraulic oil eventually flows back to the oil tank; the throttle valve (2.1) is used for speed control of the synchronous extension and retraction of the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2).

9. The oil cylinder overpressure protection circuit of the power catwalk adopts the power catwalk raising and lowering circuit according to any one of claims 4 to 8, characterized in that: include: The first overflow valve (5.1), the first overflow valve (5.1) is connected to the first lifting and lowering oil cylinder (6.1), and the first overflow valve (5.1) has a T port; The second overflow valve (5.2), the second overflow valve (5.2) is connected to the second lifting and lowering oil cylinder (6.2), and the second overflow valve (5.2) has the T port; The T port of the first overflow valve (5.1) and the T port of the second overflow valve (5.2) can be opened, or the first overflow valve (5.1) and the second overflow valve (5.2) can be led to the ground through pipelines; During the extension and retraction process of the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2), when a blockage occurs inside the lifting and releasing circuit of the entire power catwalk, the first lifting and releasing oil cylinder (6.1) and the second lifting and releasing oil cylinder (6.2) will be pressurized. If the pressure exceeds the safety pressure threshold of the T port of the first relief valve (5.1) and / or the second relief valve (5.2), the first relief valve (5.1) and / or the second relief valve (5.2) will open, and oil will flow out of the open T port or the pipeline leading to the ground, thereby realizing overpressure protection of the first lifting and releasing oil cylinder (6.1) and / or the second lifting and releasing oil cylinder (6.2).

10. The explosion-proof control circuit of the power catwalk adopts the starting and lowering circuit of the power catwalk according to any one of claims 1 to 8, characterized in that: include: The first two-way balancing valve (4.1), the second two-way balancing valve (4.2), the first lifting and unloading oil cylinder (6.1) and the second lifting and unloading oil cylinder (6.2); the first two-way balancing valve (4.1) is configured with the first lifting and unloading oil cylinder (6.1), and the first two-way balancing valve (4.1) is used to lock the hydraulic oil in the first lifting and unloading oil cylinder (6.1); The second two-way balancing valve (4.2) is configured with the second lifting and lowering oil cylinder (6.2), and the second two-way balancing valve (4.2) is used to lock the hydraulic oil in the second lifting and lowering oil cylinder (6.2).

Images