Hydraulic lifting and releasing, energy regeneration, emergency lowering and explosion-proof loop of power catwalk

Abstract

The invention discloses a hydraulic lifting and releasing, energy regeneration, lowering and anti-explosion loop of a power catwalk, which comprises an electromagnetic proportional pressure reducing valve, a multi-way reversing valve assembly, a first lifting and releasing oil cylinder and a second lifting and releasing oil cylinder, and the electromagnetic proportional pressure reducing valve has different opening degrees by introducing current with different proportions through the electromagnetic proportional pressure reducing valve; current of different proportions is introduced into the multi-way reversing valve assembly so that the multi-way reversing valve assembly can have different opening degrees, the first lifting and releasing oil cylinder can do reciprocating rectilinear motion, the second lifting and releasing oil cylinder can do reciprocating rectilinear motion, and the multi-way reversing valve assembly controls the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder to move at the same time. The multi-way reversing valve has the beneficial effects that currents of different proportions are introduced into the multi-way reversing valve assembly, and the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder are lifted stably at the same time; current of different proportions is introduced into the multi-way reversing valve assembly, current of different proportions is introduced into the electromagnetic proportional pressure reducing valve, and the first lifting and discharging oil cylinder and the second lifting and discharging oil cylinder are synchronously and stably lowered.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling tools and tool transportation equipment, and in particular to hydraulic lifting and lowering, energy regeneration, lowering and explosion-proof circuits of a power catwalk. Background Art

[0002] Power catwalk (such as Figure 1 The power catwalk is one of the important supporting equipment of the automated pipe handling system. It is used to replace the traditional mechanical catwalk and transport pipes back and forth between the drill pipe rack and the drilling table. The power catwalk adopts a mechanical, electrical and hydraulic integrated design. Through the electro-hydraulic control mode, the hydraulic drive realizes the lifting and lowering movement of the drill string device from the ground to the drilling table; then the driving sprocket drives the sliding shoe of the drill string device to move, pushing the end of the pipe string to the drilling table. The process of throwing the drill is opposite to the process of sending the drill.

[0003] The power catwalk mainly includes ramps, bases, swing arms, drill tool support beams, hydraulic systems, i.e., main lifting cylinders, and electronic control systems. The front end of the drill tool support beam has rollers, and the rear end is hinged to the swing arm. Under the push of the swing arm, it can be raised and lowered along the ramp. The drill tool support beam provides support for pipes, transporting pipes from the ground drill pipe rack to the wellhead of the drilling platform, or transporting pipes from the wellhead of the drilling platform and unloading them to the ground drill pipe rack. The hydraulic motor at the front end of the drill tool support beam drives the sliding shoe to move forward and backward to push and pull the pipes forward and backward.

[0004] The jib is used to support the drilling tool support beam. The front end of the jib is hinged to the pulley, the middle part is hinged to the main lifting cylinder of the jib, and the rear end is hinged to the drilling tool support beam. The jib rotates under the push of the main lifting cylinder to achieve the secondary lifting and lowering of the drilling tool support beam.

[0005] The main lifting cylinders are 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 jib and support frame will overturn, causing serious accidents. Therefore, during the process of raising and lowering the drilling tool support beam and the jib, the synchronous extension and retraction of the cylinders on both sides must be ensured.

[0006] At the same time, 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

[0007] 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 hydraulic lifting, energy regeneration, lowering and explosion-proof circuit for the power catwalk. By passing currents of different proportions into the multi-way reversing valve assembly, the flow rate output by the multi-way reversing valve assembly can be accurately controlled, so that the first lifting and lowering cylinder and the second lifting and lowering cylinder can be lifted simultaneously and smoothly; by passing currents of different proportions into the multi-way reversing valve assembly and passing currents of different proportions into the electromagnetic proportional pressure reducing valve, the flow rate output by the multi-way reversing valve assembly can be accurately controlled, so that the first lifting and lowering cylinder and the second lifting and lowering cylinder can be lowered synchronously and smoothly.

[0008] The present invention is achieved through the following technical solutions:

[0009] The launching and lowering circuit of the powered catwalk includes:

[0010] An electromagnetic proportional pressure reducing valve, through which currents of different proportions are passed to achieve different openings of the electromagnetic proportional pressure reducing valve;

[0011] A multi-way reversing valve assembly, through which currents of different proportions are passed to achieve different openings of the multi-way reversing valve assembly;

[0012] A first lifting and releasing cylinder, wherein the first lifting and releasing cylinder itself can perform reciprocating linear motion;

[0013] A second oil lifting and releasing cylinder, wherein the second oil lifting and releasing cylinder itself can perform reciprocating linear motion;

[0014] The multi-way reversing valve assembly controls the first lifting and lowering oil cylinder and the second lifting and lowering oil cylinder to move simultaneously;

[0015] When the control handle of the multi-way reversing valve assembly is operated to the lower position, the multi-way reversing valve assembly is supplied with current of different proportions, and the flow rate output by the multi-way reversing valve assembly can be accurately controlled, so that the first lifting and lowering oil cylinder and the second lifting and lowering oil cylinder can be lifted simultaneously and smoothly;

[0016] When the control handle of the multi-way reversing valve assembly is operated to the upper position, different proportions of current are passed into the multi-way reversing valve assembly and different proportions of current are passed into the electromagnetic proportional pressure reducing valve. The flow output by the multi-way reversing valve assembly can be accurately controlled, so that the first lifting cylinder and the second lifting cylinder can be lowered synchronously and smoothly.

[0017] Optionally, the multi-way reversing valve assembly comprises a first valve plate and a second valve plate, and different proportions of current can be passed through the first valve plate and the second valve plate to achieve different openings of the first valve plate and the second valve plate;

[0018] Different proportions of current are passed through the first valve linking plate and the second valve linking plate respectively, and the first valve linking plate and the second valve linking plate respectively control the first oil cylinder and the second oil cylinder to make reciprocating linear motion, and the first valve linking plate and the second valve linking plate operate simultaneously.

[0019] Optionally, when the control handle of the multi-way reversing valve assembly is operated to the upper position, different current ratios are passed into the multi-way reversing valve assembly so that the B1 port and B2 port of the multi-way reversing valve assembly respectively control the simultaneous lowering of the first lifting and releasing cylinder and the second lifting and releasing cylinder. During the lowering process, the outlet pressure of the electromagnetic proportional pressure reducing valve is controlled by adjusting the current passed into the electromagnetic proportional pressure reducing valve in different ratios. The outlet pressure simultaneously controls the opening of the first overflow valve and the second overflow valve corresponding to the first balancing valve and the second balancing valve, respectively, thereby controlling the outflow size of the first lifting and releasing cylinder and the second lifting and releasing cylinder. The current ratio passed into the electromagnetic proportional pressure reducing valve and the current ratio passed into the multi-way reversing valve assembly are reasonably matched, so that the flow of the first lifting and releasing cylinder and the second lifting and releasing cylinder can be accurately controlled.

[0020] Optionally, when the control handle of the multi-way reversing valve assembly is operated to the lower position, different current ratios are passed into the multi-way reversing valve assembly so that the A1 port and A2 port of the multi-way reversing valve assembly respectively control the first lifting cylinder and the second lifting cylinder to lift simultaneously, and the flow rates of the first lifting cylinder and the second lifting cylinder can be precisely controlled by passing different current ratios through the multi-way reversing valve assembly.

[0021] Optionally, the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder are respectively connected to one end of the first explosion-proof valve and one end of the second explosion-proof valve;

[0022] The other end of the first explosion-proof valve and the other end of the second explosion-proof valve are connected to the oil tank. The first explosion-proof valve and the second explosion-proof valve supply oil to the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder respectively, and the oil supplied to the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder is carried out simultaneously, so that the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder can be controlled simultaneously.

[0023] Optionally, displacement sensors are installed on the first lifting cylinder and the second lifting cylinder, and the displacement sensors provide real-time feedback of the telescopic displacement of the first lifting cylinder and the second lifting cylinder.

[0024] The energy regeneration circuit of the power catwalk includes:

[0025] The first balancing valve and the second balancing valve are respectively provided with a first hydraulically controlled reversing valve and a second hydraulically controlled reversing valve inside, and the first hydraulically controlled reversing valve and the second hydraulically controlled reversing valve are connected to the electromagnetic proportional pressure reducing valve;

[0026] When the control handle of the multi-way reversing valve assembly is operated to the upper position, the control oil provided by the electromagnetic proportional pressure reducing valve opens the first hydraulically controlled reversing valve and the second hydraulically controlled reversing valve, and the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder are connected with oil, thereby realizing the energy regeneration function of the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder.

[0027] The emergency lowering circuit of the powered catwalk includes:

[0028] Manual pump, two-way hydraulically controlled reversing valve, throttle valve, first explosion-proof valve, second explosion-proof valve, first lifting and lowering oil cylinder and second lifting and lowering oil cylinder;

[0029] When the control handle of the multi-way reversing valve assembly is operated to the upper position and the two-way hydraulically controlled reversing valve has emergency oil circuit control, the manual pump is pressurized, the two-way hydraulically controlled reversing valve is switched to open, the emergency oil circuit is opened, the oil in the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder returns to the oil tank through the emergency oil circuit, the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder are axially retracted, and the emergency lowering speed of the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder is controlled by controlling the throttle valve, so that the jib and the drilling tool support beam are safely and smoothly lowered to the inside of the base.

[0030] The explosion-proof circuit of the power catwalk includes:

[0031] A two-way hydraulically controlled reversing valve, the first explosion-proof valve, the second explosion-proof valve, a first lifting and lowering oil cylinder and a second lifting and lowering oil cylinder;

[0032] When the control handle of the multi-way reversing valve assembly is operated to the upper position and the two-way hydraulically controlled reversing valve has no emergency oil circuit control, the two-way hydraulically controlled reversing valve is in a closed state, and 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 through the first explosion-proof valve and the second explosion-proof valve respectively.

[0033] Optionally, when the control handle of the multi-way reversing valve assembly is operated to the upper position and the emergency oil circuit explodes, the first explosion-proof valve and the second explosion-proof valve are closed, the oil in the A1 port of the first oil lifting cylinder and the A2 port of the second oil lifting cylinder are not circulated, and the positions of the first oil lifting cylinder and the second oil lifting cylinder are locked;

[0034] The third relief valve and the first relief valve are arranged in the first balancing valve, and the fourth relief valve and the second relief valve are arranged in the second balancing valve;

[0035] When the oil inlet and outlet pipelines of the first lifting cylinder and the second lifting cylinder suddenly explode or become detached, there is no oil supply at this time, and the first lifting cylinder and the second lifting cylinder will stall and overturn under the action of load, and the third relief valve and the fourth relief valve will be closed, and the first relief valve and the second relief valve will be closed, and the third relief valve and the fourth relief valve will lock the oil to ensure that the first lifting cylinder and the second lifting cylinder maintain the current state, thereby preventing the first lifting cylinder and the second lifting cylinder from stalling and descending under the action of load.

[0036] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0037] 1. The present invention realizes that the electromagnetic proportional pressure reducing valve has different openings by passing currents of different proportions through the electromagnetic proportional pressure reducing valve, realizes that the multi-way reversing valve assembly has different openings by passing currents of different proportions through the multi-way reversing valve assembly, the first lifting and releasing oil cylinder itself can make reciprocating linear motion, the second lifting and releasing oil cylinder itself can make reciprocating linear motion, and the multi-way reversing valve assembly controls the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder to move simultaneously; when the control handle of the multi-way reversing valve assembly is operated to the lower position, the multi-way reversing valve assembly passes currents of different proportions, and the flow rate output by the multi-way reversing valve assembly can be accurately controlled, so that the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder can be lifted simultaneously and smoothly; when the control handle of the multi-way reversing valve assembly is operated to the upper position, the multi-way reversing valve assembly passes currents of different proportions and the electromagnetic proportional pressure reducing valve passes currents of different proportions, and the flow rate output by the multi-way reversing valve assembly can be accurately controlled, so that the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder can be lowered synchronously and smoothly.

[0038] 2. When the control handle of the multi-way reversing valve assembly of the present invention is in the upper position, the lifting and lowering of the first and second lifting and lowering cylinders are controlled after the B1 and B2 ports of the multi-way reversing valve assembly merge. During the lowering process, the outlet pressure of the electromagnetic proportional pressure reducing valve is controlled by adjusting the input current ratio. The outlet pressure simultaneously controls the opening of the first overflow valve in the first balancing valve and the opening of the second overflow valve in the second balancing valve, thereby controlling the outflow size of the rodless chamber of the first and second lifting and lowering cylinders. By reasonably matching the input current ratio of the electromagnetic proportional pressure reducing valve with the current ratio of the multi-way reversing valve assembly, the rodless chamber flow of the two lifting and lowering cylinders is accurately controlled, so that the lowering speed of the two lifting and lowering cylinders can be automatically adjusted and is stable without fluctuations.

[0039] 3. The first balancing valve and the second balancing valve of the present invention are provided with a rod chamber and a rodless chamber inside. The rod chamber and the rodless chamber inside the first balancing valve are connected via the first hydraulically controlled reversing valve, and the rod chamber and the rodless chamber inside the second balancing valve are connected via the second hydraulically controlled reversing valve. During the retraction and lowering process of the two lifting and lowering cylinders, the control oil provided by the electromagnetic proportional pressure reducing valve opens the first hydraulically controlled reversing valve and the second hydraulically controlled reversing valve. At this time, the rod chamber and the rodless chamber of the first balancing valve are respectively connected to the first hydraulically controlled reversing valve, and the rod chamber and the rodless chamber of the second balancing valve are respectively connected to the second hydraulically controlled reversing valve. The oil flow rate of the rodless chamber is large, and flows into the rod chamber through the oil circuit for oil replenishment, thereby realizing the energy regeneration function.

[0040] 4. When the control handle of the multi-way reversing valve assembly of the present invention is operated to the upper position and the two-way hydraulically controlled reversing valve has emergency oil circuit control, the manual pump is pressurized, the two-way hydraulically controlled reversing valve is switched open, the emergency oil circuit is opened, and the oil in the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder returns to the oil tank through the emergency oil circuit, and the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder are axially retracted, and the emergency lowering speed of the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder is controlled by controlling the throttle valve, so that the swing arm and the drilling tool support beam can be safely and smoothly lowered to the inside of the base.

[0041] 5. When the control handle of the multi-way reversing valve assembly of the present invention is operated to the upper position and the two-way hydraulically controlled reversing valve has no emergency oil circuit control, the two-way hydraulically controlled reversing valve is in a closed state, and 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 through the first explosion-proof valve and the second explosion-proof valve respectively. When the control handle of the multi-way reversing valve assembly is operated to the upper position and the emergency oil circuit explodes, the first explosion-proof valve and the second explosion-proof valve are closed, the oil in the A1 port of the first lifting and releasing oil cylinder and the A2 port of the second lifting and releasing oil cylinder does not flow, and the positions of the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder are locked; a first balancing valve is configured The first relief valve and the third relief valve, the second relief valve and the fourth relief valve are configured in the second balancing valve; when the inlet and outlet oil pipelines of the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder suddenly burst or disconnect, there is no oil supply at this time, and the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder will stall and overturn under the action of load, the first relief valve and the second relief valve are closed, the third relief valve and the fourth relief valve are closed, and the first relief valve and the second relief valve lock the oil to ensure that the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder maintain the current state, thereby preventing the first lifting and releasing oil cylinder and the second lifting and releasing oil cylinder from stalling and descending under the action of load. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 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:

[0043] Figure 1 This is the structural diagram of the power catwalk;

[0044] Figure 2 Schematic diagram of the hydraulic control of the main lifting and lowering mechanism.

[0045] Marks and corresponding parts names in the attached drawings:

[0046] 1-manual pump, 2-two-way hydraulically controlled reversing valve, 3-throttle valve, 4-electromagnetic proportional pressure reducing valve, 5-multi-way reversing valve assembly, 5.1-first valve plate, 5.2-second valve plate, 6.1-first balancing valve, 6.2-second balancing valve, 7.1-first explosion-proof valve, 7.2-second explosion-proof valve, 8.1-first lifting and releasing cylinder, 8.2-second lifting and releasing cylinder, a1-first overflow valve, a2-second overflow valve, b1-first hydraulically controlled reversing valve, b2-second hydraulically controlled reversing valve, TL1-displacement sensor, c1-third overflow valve, c2-fourth overflow valve. DETAILED DESCRIPTION

[0047] 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.

[0048] In the description of the present invention, the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down”, “vertical”, “horizontal”, “high”, “low”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0049] The terms "first" and "second" used in the present invention are only used to distinguish the corresponding components for the sake of clarity of description, and are not intended to limit any order or emphasize importance, etc. In addition, the term "connected" used in this article can be directly connected or indirectly connected via other components without special explanation.

[0050] Example 1

[0051] From the perspective of control circuits, the catwalk's hydraulic control system can be divided into four working circuits: 1. The hydraulic lifting and lowering circuit of the power catwalk; 2. The energy regeneration circuit of the power catwalk's balancing valve; 3. The emergency lowering circuit of the power catwalk; 4. The explosion-proof circuit of the power catwalk.

[0052] like Figure 2 As shown, the lifting and lowering circuit of the power catwalk includes: an electromagnetic proportional pressure reducing valve 4, a multi-way reversing valve assembly 5, a first lifting and lowering oil cylinder 8.1 and a second lifting and lowering oil cylinder 8.2. Different proportions of current are passed through the electromagnetic proportional pressure reducing valve 4 to realize that the electromagnetic proportional pressure reducing valve 4 has different openings, and different proportions of current are passed through the multi-way reversing valve assembly 5 to realize that the multi-way reversing valve assembly 5 has different openings. The first lifting and lowering oil cylinder 8.1 itself can make reciprocating linear motion, and the second lifting and lowering oil cylinder 8.2 itself can make reciprocating linear motion. The multi-way reversing valve assembly 5 controls the first lifting and lowering oil cylinder 8.1 and the second lifting and lowering oil cylinder 8.2 to move simultaneously;

[0053] When the control handle of the multi-way reversing valve assembly 5 is operated to the lower position, the multi-way reversing valve assembly 5 is supplied with current of different proportions, and the flow rate output by the multi-way reversing valve assembly 5 can be accurately controlled, so that the first lifting cylinder 8.1 and the second lifting cylinder 8.2 can be lifted simultaneously and smoothly;

[0054] When the control handle of the multi-way reversing valve assembly 5 is operated to the upper position, different proportions of current are passed into the multi-way reversing valve assembly 5 and different proportions of current are passed into the electromagnetic proportional pressure reducing valve 4, and the flow output by the multi-way reversing valve assembly 5 can be accurately controlled, so that the first lifting cylinder 8.1 and the second lifting cylinder 8.2 can be lowered synchronously and smoothly.

[0055] Specifically, the multi-way reversing valve assembly 5 includes a first valve plate 5.1 and a second valve plate 5.2. Different proportions of current can be passed through the first valve plate 5.1 and the second valve plate 5.2 to achieve different openings of the first valve plate 5.1 and the second valve plate 5.2.

[0056] Different proportions of current are passed through the first valve plate 5.1 and the second valve plate 5.2 respectively, and the first valve plate 5.1 and the second valve plate 5.2 respectively control the first oil cylinder 8.1 and the second oil cylinder 8.2 to make reciprocating linear motion, and the first valve plate 5.1 and the second valve plate 5.2 operate simultaneously.

[0057] When the control handle of the multi-way reversing valve assembly 5 is operated to the upper position, different current ratios are introduced into the multi-way reversing valve assembly 5 so that the B1 port and the B2 port of the multi-way reversing valve assembly 5 respectively control the simultaneous lowering of the first lifting and releasing cylinder 8.1 and the second lifting and releasing cylinder 8.2. During the lowering process, the outlet pressure of the electromagnetic proportional reducing valve 4 is controlled by adjusting the current introduced into the electromagnetic proportional reducing valve 4 in different ratios. The outlet pressure simultaneously controls the opening of the first overflow valve a1 and the second overflow valve a2 corresponding to the first balancing valve 6.1 and the second balancing valve 6.2, respectively, so as to control the outflow size of the first lifting and releasing cylinder 8.1 and the second lifting and releasing cylinder 8.2. The current ratio introduced into the electromagnetic proportional reducing valve 4 and the current ratio introduced into the multi-way reversing valve assembly 5 are reasonably matched, so that the flow of the first lifting and releasing cylinder 8.1 and the second lifting and releasing cylinder 8.2 can be accurately controlled.

[0058] When the control handle of the multi-way reversing valve assembly 5 is operated to the lower position, different current ratios are passed into the multi-way reversing valve assembly 5 so that the A1 port and the A2 port of the multi-way reversing valve assembly 5 respectively control the first lifting cylinder 8.1 and the second lifting cylinder 8.2 to lift simultaneously, and the flow rates of the first lifting cylinder 8.1 and the second lifting cylinder 8.2 are precisely controlled by passing different current ratios into the multi-way reversing valve assembly 5.

[0059] The first oil release cylinder 8.1 and the second oil release cylinder 8.2 are respectively connected to one end of the first explosion-proof valve 7.1 and one end of the second explosion-proof valve 7.2;

[0060] The other end of the first explosion-proof valve 7.1 and the other end of the second explosion-proof valve 7.2 are connected to the oil tank. The first explosion-proof valve 7.1 and the second explosion-proof valve 7.2 supply oil to the first lifting and releasing oil cylinder 8.1 and the second lifting and releasing oil cylinder 8.2 respectively, and the oil supplied to the first lifting and releasing oil cylinder 8.1 and the second lifting and releasing oil cylinder 8.2 is carried out simultaneously, so that the first lifting and releasing oil cylinder 8.1 and the second lifting and releasing oil cylinder 8.2 can be controlled simultaneously.

[0061] A displacement sensor TL1 is installed on the first lifting cylinder 8.1 and the second lifting cylinder 8.2, and the displacement sensor TL1 feeds back the telescopic displacement of the first lifting cylinder 8.1 and the second lifting cylinder 8.2 in real time.

[0062] Example 2

[0063] Based on Example 1, specifically, the first lifting oil cylinder 8.1 and the second lifting oil cylinder 8.2 are controlled by the first connecting valve plate 5.1 and the second connecting valve plate 5.2 of the multi-way reversing valve assembly 5, and the telescopic displacement of the first lifting oil cylinder 8.1 and the second lifting oil cylinder 8.2 is fed back in real time according to the displacement sensor TL1, so as to judge the actual motion trajectory of the swing arm (the first lifting oil cylinder 8.1) and the drilling tool support beam (the second lifting oil cylinder 8.2). The rodless chambers of the first lifting oil cylinder 8.1 and the second lifting oil cylinder 8.2 are connected through the first explosion-proof valve 7.1 and the second explosion-proof valve 7.2 respectively.

[0064] When the emergency oil source is disconnected, the oil in the two chambers of the oil circuit is complementary through the throttle hole of the explosion-proof valve to maintain flow balance and achieve synchronous control of the two cylinders.

[0065] When the control handle of the multi-way reversing valve assembly 5 is operated to the lower position, the A1 and A2 ports of the multi-way reversing valve assembly 5 merge and enter the rodless chambers of the first lifting cylinder 8.1 and the second lifting cylinder 8.2 respectively. The multi-way reversing valve assembly 5 passes different electrical proportions corresponding to the opening of the multi-way reversing valve assembly 5, thereby realizing precise control of the output flow rate. At this time, the real-time positions of the first lifting cylinder 8.1 and the second lifting cylinder 8.2 are judged in combination with the displacement sensor TL1, so as to realize the synchronous rising speed of the main lifting mechanism at different positions.

[0066] When the control handle of the multi-way reversing valve assembly 5 is in the upper position, after the B1 and B2 ports of the multi-way reversing valve assembly 5 merge, the first lifting and releasing cylinder 8.1 and the second lifting and releasing cylinder 8.2 are controlled to be lowered. During the lowering process, the outlet pressure of the electromagnetic proportional pressure reducing valve 4 is controlled by adjusting the input current ratio. The outlet pressure simultaneously controls the opening of the first overflow valve a1 in the first balancing valve 6.1 and the opening of the second overflow valve a2 in the second balancing valve 6.2, thereby controlling the first lifting and releasing cylinder 8.1 and the second lifting and releasing cylinder 8.2 to be free. The outflow size of the rod chamber flow is reasonably matched by the current ratio of the electromagnetic proportional pressure reducing valve 4 and the current ratio of the multi-way reversing valve assembly 5, and the rodless chamber flow of the two lifting and lowering cylinders is accurately controlled, so that the lowering speed of the two lifting and lowering cylinders can be automatically adjusted and is smooth and without fluctuations. At the same time, combined with the real-time displacement feedback from the displacement sensor TL1, the accurate control of the lowering speed at different positions is achieved to prevent the main lifting and lowering mechanism of the power catwalk or the hydraulic lifting and lowering circuit of the power catwalk from shaking, impacting and uncontrollable speed during the lowering process.

[0067] Example 3

[0068] Based on any one of Embodiments 1-2, Figure 2As shown, this embodiment provides an energy regeneration circuit of a power catwalk, namely, an energy regeneration circuit of a power catwalk balancing valve, including: a first balancing valve 6.1 and a second balancing valve 6.2, wherein the first balancing valve 6.1 and the second balancing valve 6.2 are respectively provided with a first hydraulically controlled reversing valve b1 and a second hydraulically controlled reversing valve b2, and the first hydraulically controlled reversing valve b1 and the second hydraulically controlled reversing valve b2 are connected to the electromagnetic proportional pressure reducing valve 4;

[0069] When the control handle of the multi-way reversing valve assembly 5 is operated to the upper position, the control oil provided by the electromagnetic proportional pressure reducing valve 4 opens the first hydraulically controlled reversing valve b1 and the second hydraulically controlled reversing valve b2, and the first lifting and releasing cylinder 8.1 and the second lifting and releasing cylinder 8.2 are connected with oil, thereby realizing the energy regeneration function of the first lifting and releasing cylinder 8.1 and the second lifting and releasing cylinder 8.2.

[0070] Specifically, the first balancing valve 6.1 and the second balancing valve 6.2 configured in this scheme are provided with a rod chamber and a rodless chamber inside the first balancing valve 6.1 and the second balancing valve 6.2. The rod chamber and the rodless chamber inside the first balancing valve 6.1 are connected via a first hydraulically controlled reversing valve b1, and the rod chamber and the rodless chamber inside the second balancing valve 6.2 are connected via a second hydraulically controlled reversing valve b2.

[0071] During the retracting and lowering process of the two lifting and lowering cylinders, the control oil provided by the electromagnetic proportional pressure reducing valve 4 opens the first hydraulically controlled reversing valve b1 and the second hydraulically controlled reversing valve b2. At this time, the rod chamber and the rodless chamber of the first balancing valve 6.1 are respectively connected to the first hydraulically controlled reversing valve b1, and the rod chamber and the rodless chamber of the second balancing valve 6.2 are respectively connected to the second hydraulically controlled reversing valve b2. The oil flow rate of the rodless chamber is large, and it flows into the rod chamber through the oil circuit to replenish oil, thereby realizing the energy regeneration function.

[0072] Example 4

[0073] Based on any one of embodiments 1-3, Figure 2 As shown, this embodiment provides a lowering circuit for a power catwalk, including:

[0074] A manual pump 1, a two-way hydraulically controlled reversing valve 2, a throttle valve 3, a first explosion-proof valve 7.1, a second explosion-proof valve 7.2, a first oil lifting and releasing cylinder 8.1 and a second oil lifting and releasing cylinder 8.2;

[0075] When the control handle of the multi-way reversing valve assembly 5 is operated to the upper position and the two-way hydraulically controlled reversing valve 2 has emergency oil circuit control, the manual pump 1 is pressurized, the two-way hydraulically controlled reversing valve 2 is switched open, the emergency oil circuit is opened, the oil in the first lifting and releasing oil cylinder 8.1 and the second lifting and releasing oil cylinder 8.2 returns to the oil tank through the emergency oil circuit, the first lifting and releasing oil cylinder 8.1 and the second lifting and releasing oil cylinder 8.2 retract axially, and the emergency lowering speed of the first lifting and releasing oil cylinder 8.1 and the second lifting and releasing oil cylinder 8.2 is controlled by controlling the throttle valve 3, so that the jib and the drilling tool support beam are safely and smoothly lowered to the inside of the base.

[0076] During the process of raising and lowering the power catwalk, if the equipment suddenly loses power and cannot provide the control oil source, and the equipment is in a high position, the manual pump 1 is manually operated to pressurize and control the two-way hydraulic control reversing valve 2 to switch and open, and the emergency oil circuit is opened. At this time, the oil in the rodless chamber of the first raising and lowering cylinder 8.1 and the second raising and lowering cylinder 8.2 returns to the oil tank through the emergency oil circuit, and the two raising and lowering cylinders retract, and the emergency lowering speed is controlled by the throttle valve 3, so that the jib and the drilling tool support beam are safely and smoothly lowered to the inside of the base.

[0077] Example 5

[0078] Based on any one of embodiments 1-4, Figure 2 As shown, this embodiment provides an explosion-proof circuit for a power catwalk, including:

[0079] Two-way hydraulically controlled reversing valve 2, first explosion-proof valve 7.1, second explosion-proof valve 7.2, first lifting and releasing oil cylinder 8.1 and second lifting and releasing oil cylinder 8.2;

[0080] When the control handle of the multi-way reversing valve assembly 5 is operated to the upper position and the two-way hydraulically controlled reversing valve 2 has no emergency oil circuit control, the two-way hydraulically controlled reversing valve 2 is in a closed state, and the A1 port of the first lifting and releasing oil cylinder 8.1 and the A2 port of the second lifting and releasing oil cylinder 8.2 are connected through the first explosion-proof valve 7.1 and the second explosion-proof valve 7.2 respectively.

[0081] When the control handle of the multi-way reversing valve assembly 5 is operated to the upper position and the emergency oil line bursts, the first explosion-proof valve 7.1 and the second explosion-proof valve 7.2 are closed, the oil in the A1 port of the first lifting and releasing oil cylinder 8.1 and the A2 port of the second lifting and releasing oil cylinder 8.2 do not flow, and the positions of the first lifting and releasing oil cylinder 8.1 and the second lifting and releasing oil cylinder 8.2 are locked;

[0082] The first balancing valve 6.1 is provided with a third overflow valve c1 and a first overflow valve a1, and the second balancing valve 6.2 is provided with a fourth overflow valve c2 and a second overflow valve a2;

[0083] When the oil inlet and outlet pipelines of the first lifting cylinder 8.1 and the second lifting cylinder 8.2 suddenly explode or become disconnected, there is no oil supply at this time, and the first lifting cylinder 8.1 and the second lifting cylinder 8.2 will stall and overturn under the action of load, and the third relief valve c1 and the fourth relief valve c2 will be closed, and the first relief valve a1 and the second relief valve a2 will be closed, and the third relief valve c1 and the fourth relief valve c2 will lock the oil to ensure that the first lifting cylinder 8.1 and the second lifting cylinder 8.2 maintain the current state, thereby preventing the first lifting cylinder 8.1 and the second lifting cylinder 8.2 from stalling and descending under the action of load.

[0084] Specifically, when there is no emergency oil circuit control, the two-way hydraulically controlled reversing valve 2 is in a closed state, and the A1 port of the first lifting and releasing oil cylinder 8.1 and the A2 port of the second lifting and releasing oil cylinder 8.2 are connected through the first explosion-proof valve 7.1 and the second explosion-proof valve 7.2 respectively.

[0085] During the lifting and lowering process, when the emergency oil circuit bursts, the first explosion-proof valve 7.1 and the second explosion-proof valve 7.2 are closed, the oil in the A1 port of the first lifting and lowering oil cylinder 8.1 and the A2 port of the second lifting and lowering oil cylinder 8.2 do not flow, and the positions of the two lifting and lowering oil cylinders are locked. At the same time, in the first balancing valve 6.1 and the second balancing valve 6.2, the rodless chamber oil circuits of the two lifting and lowering oil cylinders are respectively configured with the third relief valve c1, the first relief valve a1, the fourth relief valve c2, and the second relief valve a2. When the inlet and outlet oil pipelines of the two oil cylinders suddenly burst or disconnect, there is no oil supply at this time, and the two lifting and lowering oil cylinders will stall and overturn under the action of load. At this time, the third relief valve c1 and the fourth relief valve c2 of the rodless chamber are closed, the first relief valve a1 and the second relief valve a2 are closed, and the rodless chamber oil is locked, ensuring that the two lifting and lowering oil cylinders maintain the current state, thereby avoiding the two lifting and lowering oil cylinders from stalling and descending under the action of load to cause safety accidents.

[0086] 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 hydraulic lifting and lowering circuit of the power catwalk is characterized by: include: An electromagnetic proportional pressure reducing valve (4), through which currents of different proportions are passed to achieve different openings of the electromagnetic proportional pressure reducing valve (4); A multi-way reversing valve assembly (5), wherein different proportions of current are passed through the multi-way reversing valve assembly (5) to achieve different openings of the multi-way reversing valve assembly (5); A first lifting and releasing oil cylinder (8.1), wherein the first lifting and releasing oil cylinder (8.1) itself can perform reciprocating linear motion; A second oil lifting and releasing cylinder (8.2), wherein the second oil lifting and releasing cylinder (8.2) itself can perform reciprocating linear motion; The multi-way reversing valve assembly (5) controls the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) to move simultaneously; When the control handle of the multi-way reversing valve assembly (5) is operated to the lower position, currents of different proportions are passed into the multi-way reversing valve assembly (5), and the flow rate output by the multi-way reversing valve assembly (5) can be accurately controlled, thereby achieving simultaneous and stable lifting of the first lifting and lowering oil cylinder (8.1) and the second lifting and lowering oil cylinder (8.2); When the control handle of the multi-way reversing valve assembly (5) is operated to the upper position, currents of different proportions are passed through the multi-way reversing valve assembly (5) and currents of different proportions are passed through the electromagnetic proportional pressure reducing valve (4), and the flow rate output by the multi-way reversing valve assembly (5) can be accurately controlled, thereby achieving synchronous and stable lowering of the first lifting and lowering oil cylinder (8.1) and the second lifting and lowering oil cylinder (8.2).

2. The hydraulic raising and lowering circuit of the power catwalk according to claim 1, characterized in that: The multi-way reversing valve assembly (5) comprises a first valve plate (5.1) and a second valve plate (5.2), and the first valve plate (5.1) and the second valve plate (5.2) can each pass currents of different proportions to achieve different openings of the first valve plate (5.1) and the second valve plate (5.2); Different proportions of current are respectively passed through the first valve linking plate (5.1) and the second valve linking plate (5.2), and the first valve linking plate (5.1) and the second valve linking plate (5.2) respectively control the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) to perform reciprocating linear motion, and the first valve linking plate (5.1) and the second valve linking plate (5.2) operate simultaneously.

3. The hydraulic raising and lowering circuit of the power catwalk according to claim 2, characterized in that: When the control handle of the multi-way reversing valve assembly (5) is operated to the upper position, the multi-way reversing valve assembly (5) passes different current ratios so that the B1 port and the B2 port of the multi-way reversing valve assembly (5) respectively control the simultaneous lowering of the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2). During the lowering process, the outlet pressure of the electromagnetic proportional pressure reducing valve (4) is controlled by adjusting the current of different ratios passed through the electromagnetic proportional pressure reducing valve (4). The outlet pressure simultaneously controls the opening of the first overflow valve (a1) and the second overflow valve (a2) corresponding to the first balancing valve (6.1) and the second balancing valve (6.2), respectively, thereby controlling the outflow size of the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2). The current ratio passed through the electromagnetic proportional pressure reducing valve (4) and the current ratio passed through the multi-way reversing valve assembly (5) are reasonably matched, so that the flow of the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) is accurately controlled.

4. The hydraulic raising and lowering circuit of the power catwalk according to claim 3, characterized in that: When the control handle of the multi-way reversing valve assembly (5) is operated to the lower position, different current ratios are passed into the multi-way reversing valve assembly (5) so that the A1 port and the A2 port of the multi-way reversing valve assembly (5) respectively control the first lifting and unloading oil cylinder (8.1) and the second lifting and unloading oil cylinder (8.2) to be lifted simultaneously, and the flow rates of the first lifting and unloading oil cylinder (8.1) and the second lifting and unloading oil cylinder (8.2) are precisely controlled by passing different current ratios into the multi-way reversing valve assembly (5).

5. The hydraulic raising and lowering circuit of the power catwalk according to claim 3, characterized in that: The first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) are respectively connected to one end of the first explosion-proof valve (7.1) and one end of the second explosion-proof valve (7.2); The other end of the first explosion-proof valve (7.1) and the other end of the second explosion-proof valve (7.2) are connected to the oil tank. The first explosion-proof valve (7.1) and the second explosion-proof valve (7.2) supply oil to the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) respectively. The oil supplied to the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) is carried out simultaneously, so that the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) can be controlled simultaneously.

6. The hydraulic raising and lowering circuit of the power catwalk according to claim 5, characterized in that: The first lifting and lowering oil cylinder (8.1) and the second lifting and lowering oil cylinder (8.2) are installed with displacement sensors (TL1), and the displacement sensors (TL1) provide real-time feedback of the telescopic displacement of the first lifting and lowering oil cylinder (8.1) and the second lifting and lowering oil cylinder (8.2).

7. An energy regeneration circuit for a powered catwalk, comprising at least one starting and lowering circuit for a powered catwalk as claimed in claims 3 to 6, characterized in that: A first hydraulically controlled reversing valve (b1) and a second hydraulically controlled reversing valve (b2) are respectively provided inside the first balancing valve (6.1) and the second balancing valve (6.2); the first hydraulically controlled reversing valve (b1) and the second hydraulically controlled reversing valve (b2) are connected to the electromagnetic proportional pressure reducing valve (4); When the control handle of the multi-way reversing valve assembly (5) is operated to the upper position, the control oil provided by the electromagnetic proportional pressure reducing valve (4) opens the first hydraulically controlled reversing valve (b1) and the second hydraulically controlled reversing valve (b2), and the first lifting and releasing oil cylinder (8.1) and the second lifting and releasing oil cylinder (8.2) are connected with oil, thereby realizing the energy regeneration function of the first lifting and releasing oil cylinder (8.1) and the second lifting and releasing oil cylinder (8.2).

8. The emergency lowering circuit of the power catwalk adopts at least one raising and lowering circuit of the power catwalk as claimed in claim 5 or 6, characterized in that: include: A manual pump (1), a two-way hydraulically controlled reversing valve (2), a throttle valve (3), the first explosion-proof valve (7.1), the second explosion-proof valve (7.2), the first oil lifting and releasing cylinder (8.1) and the second oil lifting and releasing cylinder (8.2); When the control handle of the multi-way reversing valve assembly (5) is operated to the upper position and the two-way hydraulically controlled reversing valve (2) has emergency oil circuit control, the manual pump (1) is pressurized, the two-way hydraulically controlled reversing valve (2) is switched open, the emergency oil circuit is opened, the oil in the first lifting and releasing oil cylinder (8.1) and the second lifting and releasing oil cylinder (8.2) returns to the oil tank through the emergency oil circuit, the first lifting and releasing oil cylinder (8.1) and the second lifting and releasing oil cylinder (8.2) are axially retracted, and the emergency lowering speed of the first lifting and releasing oil cylinder (8.1) and the second lifting and releasing oil cylinder (8.2) is controlled by controlling the throttle valve (3), so that the swing arm and the drilling tool support beam are safely and smoothly lowered to the inside of the base.

9. The explosion-proof circuit of the power catwalk uses the lowering circuit of the power catwalk as claimed in claim 8, characterized in that: include: The two-way hydraulically controlled reversing valve (2), the first explosion-proof valve (7.1), the second explosion-proof valve (7.2), the first oil lifting and releasing cylinder (8.1) and the second oil lifting and releasing cylinder (8.2); When the control handle of the multi-way reversing valve assembly (5) is operated to the upper position and the two-way hydraulically controlled reversing valve (2) has no emergency oil circuit control, the two-way hydraulically controlled reversing valve (2) is in a closed state, and the A1 port of the first lifting and lowering oil cylinder (8.1) and the A2 port of the second lifting and lowering oil cylinder (8.2) are connected through the first explosion-proof valve (7.1) and the second explosion-proof valve (7.2), respectively.

10. The explosion-proof circuit of the power catwalk according to claim 9, characterized in that: When the control handle of the multi-way reversing valve assembly (5) is operated to the upper position and the emergency oil line explodes, the first explosion-proof valve (7.1) and the second explosion-proof valve (7.2) are closed, the oil in the A1 port of the first oil lifting cylinder (8.1) and the A2 port of the second oil lifting cylinder (8.2) do not flow, and the positions of the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) are locked; A third overflow valve (c1) and a first overflow valve (a1) are arranged in the first balancing valve (6.1), and a fourth overflow valve (c2) and a second overflow valve (a2) are arranged in the second balancing valve (6.2); When the oil inlet and outlet pipelines of the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) suddenly explode or become disconnected, there is no oil supply at this time, and the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) will stall and overturn under the action of load, the third overflow valve (c1) and the fourth overflow valve (c2) are closed, the first overflow valve (a1) and the second overflow valve (a2) are closed, and the third overflow valve (c1) and the fourth overflow valve (c2) lock the oil, ensuring that the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) maintain the current state, thereby preventing the first oil lifting cylinder (8.1) and the second oil lifting cylinder (8.2) from stalling and descending under the action of load.

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