Hydraulic switch maintenance device and leveling method thereof

Abstract

The application provides a hydraulic switch maintenance device and a leveling method thereof, and belongs to the technical field of power equipment maintenance. The device comprises a bearing structure, a hydraulic power unit, an actuator and a height calibration device. The bearing structure is used for bearing a handcart switch. The actuator is arranged below the bearing structure and comprises four groups of action execution ends, which are arranged at four corners of the bearing structure respectively. The hydraulic power unit has a synchronous working state and a single-cylinder independent working state. In the synchronous working state, the hydraulic power unit synchronously supplies oil to the four groups of action execution ends to realize overall lifting. In the single-cylinder independent working state, the hydraulic power unit selectively supplies oil to at least one group of action execution ends to realize independent lifting of the corresponding corner. The height calibration device outputs an alignment signal when the handcart switch and the cabinet body of the switch cabinet are at the same preset height. The application realizes synchronous coarse adjustment and single-cylinder fine adjustment linkage through the dual-mode switching of the hydraulic power unit, thereby improving the leveling efficiency and the docking accuracy.

Description

Technical Field

[0001] This application belongs to the field of power equipment maintenance technology, specifically relating to a hydraulic switch maintenance device and its leveling method. Background Technology

[0002] Handcart-type switchgear is a core power equipment in substations and distribution rooms. Maintenance work requires the use of a specialized platform to move the handcart switchgear, weighing over 100 kilograms, out of the cabinet and park it, precisely adjusting its height to ensure reliable connection with the cabinet's stationary contacts after maintenance. With the increasing demands for lean maintenance in the power industry, higher requirements are being placed on maintenance platforms in terms of load-bearing stability, ease of operation, and precise alignment.

[0003] Currently, there are two main types of commonly used handcart switch maintenance platforms. The first type is the screw lifting platform, which uses a lead screw or worm gear drive for lifting. This type of platform has a large driving torque, making operation extremely laborious; it uses four independent lead screws for individual adjustment, making leveling cumbersome, with a single leveling operation taking an average of about 9 minutes. Furthermore, height adjustment relies entirely on the operator's visual judgment, making it difficult to guarantee adjustment accuracy. The second type is the hydraulic drive platform, which utilizes hydraulic principles to amplify force output, reducing operating force to some extent. However, existing hydraulic platforms mostly adopt an overall synchronous lifting design, with four supporting hydraulic cylinders operating uniformly, lacking independent fine-tuning capabilities at each corner. This fails to meet the need for precise angle corrections when the handcart switch and cabinet contacts are accurately aligned. In addition, existing solutions lack effective quantitative methods for determining whether the height is aligned.

[0004] In summary, the aforementioned deficiencies have long resulted in the challenges of high operational intensity, low leveling efficiency, and poor alignment accuracy in the maintenance of switchgear. How to achieve labor-saving lifting and independent, efficient leveling of the maintenance platform at all four corners without relying on an external power supply, while simultaneously providing accurate alignment detection methods, is an urgent problem to be solved. Summary of the Invention

[0005] In a first aspect, embodiments of this application provide a hydraulic switch maintenance device, including a load-bearing structure, a hydraulic power unit, an actuator, and a height calibration device; The actuator is located below and supports the load-bearing structure. The actuator includes four sets of actuating ends, which are respectively located at the four corners of the load-bearing structure. They are used to lift and lower under the drive of the hydraulic power unit, so as to drive the load-bearing structure to lift and lower. The oil outlet of the hydraulic power unit is connected to the actuator. The hydraulic power unit has a synchronous working state and a single-cylinder independent working state. In the synchronous working state, the hydraulic power unit synchronously delivers hydraulic oil to four sets of actuators. In the single-cylinder independent working state, the hydraulic power unit selectively delivers hydraulic oil to at least one set of actuators in the actuator. The height calibration device includes a first calibration component and a second calibration component. The first calibration component is set at a preset height on the load-bearing structure, and the second calibration component is set on the switch cabinet and cooperates with the first calibration component. The height calibration device is used to output an alignment signal when the handcart switch is raised and lowered with the load-bearing structure to the same preset height as the switch cabinet.

[0006] Furthermore, the hydraulic power unit includes a dual-plunger pump, a hydraulic synchronizer, an oil reservoir, and a relief valve; The dual-plunger pump is equipped with an operating handle; The outlet of the dual-plunger pump is connected to the inlet of the hydraulic synchronous distributor and the inlet of the relief valve. A dual-plunger pump is used to convert manual driving force into hydraulic energy and amplify the force output when the operating handle is turned. The hydraulic synchronous flow divider has a synchronous gear and several independent gears for each cylinder. The synchronous gear corresponds to the synchronous working state, and the independent gear for each cylinder corresponds to the independent working state for each cylinder. The oil reservoir is connected to the inlet of the dual-plunger pump and the outlet of the overflow valve.

[0007] Furthermore, the hydraulic synchronizer includes a valve body and a valve core; The valve core is located inside the valve body and can rotate relative to the valve body and move axially. The valve body is equipped with one oil inlet, four actuation outlets and one return port. The four actuation outlets are respectively connected to four sets of actuation ends, and the return port is used to connect to the oil storage tank. The valve core has an oil passage groove and has a preset synchronization angle position and several single cylinder angle positions. When the valve core rotates to the synchronous angle position, the oil inlet is simultaneously connected to the four actuator oil outlets through the oil passage groove, and the return oil port is cut off, so the hydraulic synchronous flow divider is in synchronous working state. When the valve core rotates to any single cylinder angle position, the oil inlet is connected to only one of the four actuator oil outlets through the oil passage groove, while the remaining three actuator oil outlets and return oil outlets are cut off, and the hydraulic synchronous distributor is in a single cylinder independent working state.

[0008] Furthermore, a double-acting piston cylinder is used at the actuator end; Four sets of double-acting piston cylinders are respectively located at the four corners of the load-bearing structure. The oil outlet of the hydraulic power unit is connected to the rodless chamber oil port or the rod chamber oil port of each double-acting piston cylinder. The top of the piston rod of each double-acting piston cylinder is connected to the load-bearing structure through a ball joint support. The ball joint support includes a ball head seat and a spherical bearing. The ball head seat is fixedly connected to the top of the piston rod, and the spherical bearing is arranged between the ball head seat and the load-bearing structure to form a spherical pair fit. The spherical pair fit allows the piston rod to adaptively deflect within a preset angle range.

[0009] Furthermore, the load-bearing structure includes a grid-like frame and a load-bearing slab; The load-equalizing plate is placed above the grid-shaped frame to support the handcart switch and evenly distribute the load. The first calibration component of the altitude calibration device is the laser sensor transmitter, and the second calibration component of the altitude calibration device is the laser sensor receiver; The laser sensor transmitter is provided with a first magnetic mounting bracket, and the laser sensor receiver is provided with a second magnetic mounting bracket. The first magnetic mounting bracket detachably fixes the laser sensor transmitter to a preset height at the grid-shaped frame; The second magnetic mounting bracket detachably fixes the laser sensor receiver to the same height as the switch cabinet. The laser sensor receiver outputs an alignment signal when it receives light from the laser sensor transmitter.

[0010] Secondly, embodiments of this application also provide a leveling method using the hydraulic switch maintenance device described in the first aspect, comprising the following steps: S1. The handcart switch is installed on the load-bearing structure; S2. Switch the hydraulic power unit to synchronous working state to drive the four sets of action execution ends of the actuator to rise and fall synchronously, and perform coarse height adjustment on the load-bearing structure and handcart switch; S3. The first calibration component of the height calibration device is set at a preset height of the load-bearing structure, and the second calibration component is set on the switch cabinet body, with the second calibration component cooperating with the first calibration component; S4. Obtain the detection results from the height calibration device; If the alignment signal is output, proceed to step S6; If no alignment signal is output, proceed to step S5; S5. Determine that the handcart switch and the switch cabinet are not at the same preset height. Based on the deviation, determine the target angle from the four corners of the load-bearing structure, switch the hydraulic power unit to the single-cylinder independent working state, drive the action execution end in the actuator corresponding to the target angle to rise and fall independently, and return to step S4. S6. Push the handcart switch from the load-bearing structure into the switch cabinet to complete the docking.

[0011] Furthermore, the specific steps of step S2 are as follows: S21. Rotate the valve core of the hydraulic synchronous distributor to the synchronous angle position, so that the oil inlet is simultaneously connected to the four execution oil outlets through the oil passage groove on the valve core, and the oil return port is cut off, and the hydraulic power unit switches to the synchronous working state. S22. Move the operating handle of the double plunger pump to draw the hydraulic oil in the oil tank into the double plunger pump and pressurize it to the working pressure before outputting it. The high-pressure hydraulic oil is synchronously delivered to the four sets of action actuators through the oil inlet of the hydraulic synchronous distributor, the oil passage groove of the valve core and the four execution oil outlets, driving the four sets of action actuators to extend synchronously, and driving the load-bearing structure and the handcart switch to rise as a whole. S23. When descent is required, reverse the operation handle of the double plunger pump. The hydraulic oil in the four action execution ends flows back to the oil tank through the return port of the hydraulic synchronous distributor, driving the load-bearing structure and handcart switch to descend as a whole.

[0012] Furthermore, the specific steps of step S3 are as follows: S31. Fix the laser sensor transmitter to the preset standard height of the supporting structure using a magnetic mounting bracket; S32. Fix the laser sensor receiver to the switch cabinet at the same standard height as the laser sensor transmitter using a magnetic mounting bracket; S33. Adjust the light emission direction of the laser sensor transmitter to be aligned with the light reception direction of the laser sensor receiver to establish a beam-to-beam relationship between the laser sensor transmitter and the laser sensor receiver.

[0013] Furthermore, the specific steps of step S4 are as follows: S41. Identify the status of the indicator lights on the laser sensor receiver as the detection result of the height calibration device; If the indicator light is on, proceed to step S42; If the indicator light does not turn on, proceed to step S43; S42. Determine that the laser sensor receiver has received the light from the laser sensor transmitter, output an alignment signal, and proceed to step S6; S43. If the laser sensor receiver does not receive the light from the laser sensor transmitter and does not output an alignment signal, it indicates that the handcart switch and the switch cabinet are not at the same preset height, proceed to step S5.

[0014] Furthermore, the specific steps of step S5 are as follows: S51. Based on the relative deviation between the current position of the load-bearing structure and the switch cabinet, determine the target angles that need to be adjusted from the four corners of the load-bearing structure; S52. Rotate the valve core of the hydraulic synchronous distributor to the single cylinder angle position corresponding to this target angle, so that the oil inlet is connected to only one of the four execution oil outlets through the oil passage groove on the valve core, while the remaining three execution oil outlets and return oil ports are cut off, and the hydraulic power unit switches to the single cylinder independent working state. S53. Move the operating handle of the double plunger pump to deliver high-pressure hydraulic oil through the open actuator outlet to the actuator corresponding to the target angle, driving the actuator to extend or retract independently, so that the area of ​​the target angle in the bearing structure can be raised or lowered independently. S54. Stop operating the handle and return to step S4 to reacquire the detection results of the height calibration device; If the altitude calibration device still does not output an alignment signal, continue to adjust the same target angle and repeat S52 to S54. If the height calibration device outputs an alignment signal, proceed to step S55; S55. Determine that the target angle is aligned, switch to the next target angle to be adjusted, and repeat S52 to S54 until the laser sensor receivers corresponding to the four corners of the supporting structure all output alignment signals, and the adjustment is completed.

[0015] As can be seen from the above technical solutions, this application has the following advantages: The hydraulic switch maintenance device and its leveling method provided in this application achieve the linkage control of synchronous coarse adjustment and single-cylinder fine adjustment of the handcart switch maintenance device by switching between the synchronous working state and the independent working state of the hydraulic power unit, combined with the symmetrical arrangement of four sets of action execution ends and the closed-loop detection of the height calibration device. This reduces the operating force, shortens the single leveling time, and improves the adjustment accuracy under the condition of no external power supply. At the same time, it realizes independent fine adjustment of the four corners, which solves the problems of laborious operation, low leveling efficiency, lack of independent leveling function, and reliance on visual judgment for height adjustment of traditional maintenance platforms. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the load-bearing structure of the hydraulic switch maintenance device of the present invention.

[0018] Figure 2 This is a schematic diagram of the hydraulic power unit of the hydraulic switch maintenance device of the present invention.

[0019] Figure 3 This is a schematic diagram of the installation of the second calibration component of the present invention in the switch cabinet.

[0020] Figure 4 This is a schematic flowchart of the leveling method for the hydraulic switch maintenance device of the present invention.

[0021] Figure 5 This is a schematic diagram showing the distribution of the annular grooves on the outer circumferential surface of the valve core according to the present invention.

[0022] Figure 6 This is a top view schematic diagram showing the distribution of the first arc-shaped groove on the outer circumferential surface of the valve core according to the present invention.

[0023] Figure 7 This is a top view schematic diagram showing the distribution of the second arc-shaped groove on the outer circumferential surface of the valve core according to the present invention.

[0024] Figure 8 This is a top view schematic diagram showing the distribution of the third arc-shaped groove on the outer circumferential surface of the valve core according to the present invention.

[0025] Figure 9 This is a top view schematic diagram showing the distribution of the fourth arc-shaped groove on the outer circumferential surface of the valve core according to the present invention.

[0026] Figure 10 This is a schematic diagram showing the valve core and valve body of the present invention relative to each other.

[0027] Among them, 1-Double plunger pump; 2-Hydraulic synchronous distributor; 2.1-Inlet; 2.2-Actuation outlet; 2.2.1-First actuation outlet; 2.2.2-Second actuation outlet; 2.2.3-Third actuation outlet; 2.2.4-Fourth actuation outlet; 2.3-Return outlet; 3-Oil reservoir; 4-Relief valve; 5-Operating handle; 6.1-Annular groove; 6.2-First arc-shaped groove; 6.3-Second arc-shaped groove; 6.4-Third arc-shaped groove; 6.5-Fourth arc-shaped groove. Detailed Implementation

[0028] Various embodiments of this disclosure will be described more fully in the following detailed description of the hydraulic switch maintenance device. This disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of this disclosure to the specific embodiments disclosed herein, but rather this disclosure should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of this disclosure.

[0029] This embodiment provides a hydraulic switch maintenance device that reduces operating force through hydraulic drive, achieves efficient coarse adjustment and precise fine adjustment through synchronous and independent dual-mode switching, and quantifies height through laser calibration to ensure accurate, safe and stable docking between the handcart switch and the cabinet.

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The specific implementation process in this embodiment provides a hydraulic switch maintenance device, which includes a load-bearing structure, a hydraulic power unit, an actuator, and a height calibration device; The actuator is located below and supports the load-bearing structure. The actuator includes four sets of actuating ends, which are respectively located at the four corners of the load-bearing structure. They are used to lift and lower under the drive of the hydraulic power unit, so as to drive the load-bearing structure to lift and lower. It should be noted that the load-bearing structure provides a stable parking platform for the handcart switch, and evenly distributes the load of the handcart switch to the four sets of actuators to avoid local stress concentration; the load-bearing structure provides multi-point support through the actuators set at the four corners, ensuring that the handcart switch remains stable during lifting and leveling, and preventing tilting or shaking caused by uneven force. The actuator includes four sets of symmetrically arranged motion actuators at the four corners of the load-bearing structure, which are the direct drive components for lifting and lowering the load-bearing structure. The symmetrical arrangement at the four corners ensures balanced support for the load-bearing structure and avoids uneven loading. Each motion actuator can operate independently, so that the height of each corner of the load-bearing structure can be adjusted individually, realizing the function of independent leveling of the four corners. This solves the defect of existing hydraulic platforms that can only lift and lower as a whole and cannot make fine adjustments to a single corner. The oil outlet of the hydraulic power unit is connected to the actuator. The hydraulic power unit has a synchronous working state and a single-cylinder independent working state. In the synchronous working state, the hydraulic power unit synchronously delivers hydraulic oil to four sets of actuators. In the single-cylinder independent working state, the hydraulic power unit selectively delivers hydraulic oil to at least one set of actuators in the actuator. It should be noted that the hydraulic power unit has two modes: synchronous working mode and single-cylinder independent working mode. It can realize the linkage control of synchronous coarse adjustment and single-cylinder fine adjustment. In the synchronous working mode, the four sets of actuators move synchronously to achieve rapid overall lifting and lowering, which greatly shortens the coarse adjustment time. In the single-cylinder independent working mode, any one or more sets of actuators can be selectively driven to move individually to achieve independent fine adjustment of the four corners. The flexible switching between the two modes allows the operator to flexibly select the adjustment method according to the actual deviation, so as to achieve a balance between efficiency and accuracy. The height calibration device includes a first calibration component and a second calibration component. The first calibration component is set at a preset height on the load-bearing structure, and the second calibration component is set on the switch cabinet and cooperates with the first calibration component. The height calibration device is used to output an alignment signal when the handcart switch is raised and lowered with the load-bearing structure to the same preset height as the switch cabinet. It should be noted that the height calibration device automatically outputs an alignment signal when the handcart switch and the switch cabinet are at the same preset height through the inter-beam coordination of the first and second calibration components. This avoids the traditional practice of relying entirely on the operator's visual judgment. The output of the alignment signal provides the operator with an indication that the adjustment is complete, avoiding contact collision damage that may be caused by pushing the cart by hand.

[0032] This embodiment achieves leveling of the handcart switch maintenance platform through the cooperation of four components: the load-bearing structure, the hydraulic power unit, the actuator, and the height calibration device. The dual-mode switching of the hydraulic power unit allows the four sets of actuators to simultaneously raise and lower for rapid coarse adjustment, or to raise and lower independently by a single cylinder for precise fine adjustment. The height calibration device ensures accurate adjustment, ultimately achieving optimization from coarse adjustment to fine adjustment, solving the problems of laborious operation, low leveling efficiency, and poor docking accuracy in the prior art.

[0033] Furthermore, as a refinement and extension of the specific implementation of the above embodiments, in order to fully illustrate the specific implementation process in this embodiment, another specific embodiment of the hydraulic switch maintenance device is provided. The device includes a load-bearing structure, a hydraulic power unit, an actuator, and a height calibration device. The actuator is located below and supports the load-bearing structure. The actuator includes four sets of actuating ends, which are respectively located at the four corners of the load-bearing structure. They are used to lift and lower under the drive of the hydraulic power unit, so as to drive the load-bearing structure to lift and lower. The oil outlet of the hydraulic power unit is connected to the actuator. The hydraulic power unit has a synchronous working state and a single-cylinder independent working state. In the synchronous working state, the hydraulic power unit synchronously delivers hydraulic oil to four sets of actuators. In the single-cylinder independent working state, the hydraulic power unit selectively delivers hydraulic oil to at least one set of actuators in the actuator. The height calibration device includes a first calibration component and a second calibration component. The first calibration component is set at a preset height on the load-bearing structure, and the second calibration component is set on the switch cabinet and cooperates with the first calibration component. The height calibration device is used to output an alignment signal when the handcart switch is raised and lowered with the load-bearing structure to the same preset height as the switch cabinet. like Figure 1 , Figure 2 and Figure 3 As shown, the hydraulic power unit includes a dual-plunger pump 1, a hydraulic synchronizing distributor 2, an oil reservoir 3, and a relief valve 4; The dual-plunger pump 1 is equipped with an operating handle 5; The oil outlet of the dual plunger pump 1 is connected to the oil inlet of the hydraulic synchronous distributor 2 and the oil inlet of the relief valve 4. The dual-plunger pump 1 is used to convert manual driving force into hydraulic energy and amplify the force output when the operating handle 5 is turned; The hydraulic synchronous flow divider 2 has a synchronous gear and several independent gears for each cylinder. The synchronous gear corresponds to the synchronous working state, and the independent gear for each cylinder corresponds to the independent working state for each cylinder. The oil reservoir 3 is connected to the oil inlet of the dual-plunger pump 1 and the oil outlet of the overflow valve 4. The opening pressure of relief valve 4 is 10MPa, which is used to open and relieve pressure when the system pressure exceeds 10MPa; The displacement of the dual-plunger pump 1 is 5.0-5.2 ml / cycle, and the working pressure is 10 MPa; The hydraulic synchronous flow divider 2 includes a valve body and a valve core; The valve core is located inside the valve body and can rotate relative to the valve body and move axially. The valve body is provided with an oil inlet 2.1, four actuation outlets 2.2 and one return port 2.3. The four actuation outlets 2.2 are respectively connected to four sets of actuation ends, and the return port 2.3 is used to connect to the oil storage tank 3. The valve core has an oil passage groove and has a preset synchronization angle position and several single cylinder angle positions. like Figure 10 As shown, the valve core is a cylindrical structure with several oil passage grooves on its outer circumferential surface; each oil passage groove is distributed at different angular positions in the circumferential direction of the valve core and at different height positions in the axial direction of the valve core, and the opening angle and groove direction of each oil passage groove are predetermined according to the synchronization angle position and the angle position of each single cylinder. The outer circumferential surface of the valve core is also provided with a spiral guide groove, and the inner wall of the valve body is provided with a guide pin that slides in cooperation with the spiral guide groove. When the operator drives the valve core to rotate relative to the valve body through the handle or knob, the guide pin slides along the spiral guide groove, driving the valve core to rotate around its own axis while moving axially. That is, the movement of the valve core relative to the valve body is a spiral motion that combines rotation and axial movement. The oil inlet 2.1 on the valve body is fixed at a certain axial height layer of the valve body; through helical movement, the valve core can selectively align the oil passage grooves at different axial heights on its outer circumference with the axial height layer where the oil inlet 2.1 is located; Specifically, the valve core has five sets of oil passage grooves; such as Figure 5As shown, the first set of oil passage grooves is an annular groove 6.1 extending along the valve core axis, located at the first axial position. When the valve core moves axially to the first axial position (i.e., the synchronous angle position) via helical motion, the annular groove 6.1 aligns with the axial height layer of the oil inlet 2.1, and the oil inlet 2.1 simultaneously connects to the four actuator oil outlets 2.2 through the annular groove 6.1, achieving synchronous oil supply. The remaining four sets of oil passage grooves are four independent arc-shaped grooves, located at the second to fifth axial positions along the valve core axis, corresponding one-to-one with the first to fourth actuator oil outlets, and distributed at 90° intervals around the valve core circumference. Figure 6 As shown, when the valve core moves axially to the second axial position (i.e., the first single-cylinder angle position) via helical motion, the oil inlet 2.1 aligns with the axial height layer of the first arc-shaped groove 6.2. The first arc-shaped groove 6.2 connects the oil inlet 2.1 with the first actuated oil outlet 2.2.1, while the other three actuated oil outlets and the return oil port 2.3 are cut off. Figure 7 As shown, when the valve core moves axially to the third axial position (i.e., the second single-cylinder angle position) via helical motion, the oil inlet 2.1 aligns with the axial height layer of the second arc-shaped groove 6.3. The second arc-shaped groove 6.3 connects the oil inlet 2.1 with the second actuated oil outlet 2.2.2, while the rest are cut off; as... Figure 8 As shown, when the valve core moves axially to the fourth axial position (i.e., the third single-cylinder angle position) via helical motion, the oil inlet 2.1 aligns with the axial height layer of the third arc-shaped groove 6.4. The third arc-shaped groove 6.4 connects the oil inlet 2.1 with the third actuated oil outlet 2.2.3, while the others are cut off; as... Figure 9 As shown, when the valve core moves axially to the fifth axial position (i.e., the fourth single cylinder angle position) through the helical motion, the oil inlet 2.1 is aligned with the axial height layer where the fourth arc groove 6.5 is located. The fourth arc groove 6.5 connects the oil inlet 2.1 with the fourth actuated oil outlet 2.2.4, and the rest are cut off. The valve core is provided with a handle or knob at the top, and the operator drives the valve core to rotate relative to the valve body by turning the handle or knob; the valve body is also provided with a positioning device (such as a spring positioning ball cooperating with a positioning recess) to provide positioning feedback when the valve core rotates to each preset angle position, so that the operator can clearly perceive the current gear position; It should be noted that the above-mentioned valve core oil passage groove layout and spiral guide groove structure allow the switching between synchronous mode and individual cylinder independent mode to be completed simply by rotating the handle or knob. The rotation action is automatically converted into the axial movement of the valve core through the spiral guide groove, aligning the oil inlet 2.1 with the oil passage grooves at different axial heights. No reconnection of the hydraulic pipeline is required, nor is it necessary to set up multiple independent directional valves. Through the differentiated layout of the oil passage grooves at different axial heights and circumferential angles on a single valve core, the technical effect of switching between synchronous and individual cylinder independent modes can be achieved by using only one valve core and performing one rotation operation. The structure is compact and the operation is convenient. At the same time, since the axial movement of the valve core is automatically achieved by the cooperation of the spiral guide groove and the guide pin, the operator does not need to perform additional push and pull operations. All mode switching can be completed by simply rotating the handle, reducing the complexity of operation. When the valve core rotates to the synchronous angle position, the oil inlet 2.1 is simultaneously connected to the four actuator outlets 2.2 through the oil passage groove, and the return oil port 2.3 is cut off, so the hydraulic synchronous distributor 2 is in synchronous working state; When the valve core rotates to any single cylinder angle position, the oil inlet 2.1 is connected to only one of the four execution oil outlets 2.2 through the oil passage groove, while the remaining three execution oil outlets 2.2 and return oil outlet 2.3 are cut off, and the hydraulic synchronous distributor 2 is in a single cylinder independent working state; As an optional embodiment, the number and location of the oil passage grooves are determined based on the number of synchronization angle positions and single cylinder angle positions; for example, five independent oil passage grooves can be opened on the valve core, wherein the first oil passage groove connects the oil inlet to four execution oil outlets simultaneously when the valve core is in the synchronization angle position; the other four oil passage grooves connect the oil inlet to one of the corresponding four execution oil outlets when the valve core is in one of the four single cylinder angle positions respectively. It should be noted that the layout of the valve core oil passage grooves allows the switching between synchronous mode and single-cylinder independent mode to be completed simply by rotating the valve core, without any reconnection of the hydraulic lines. In actual operation, the operator does not need to leave the operating position after synchronous lifting and lowering; simply rotating the distributor valve core will switch to single-cylinder independent mode for fine-tuning the target angle. Since the gear switching response time is less than 0.5 seconds, the entire switching process is smooth and uninterrupted, allowing the operator to continuously complete the entire work process from coarse adjustment to switching, then to fine adjustment, and finally to testing. The actuator uses a double-acting piston cylinder 6; Four sets of double-acting piston cylinders 6 are respectively located at the four corners below the load-bearing structure. The oil outlet of the hydraulic power unit is connected to the rodless chamber oil port or the rod chamber oil port of each double-acting piston cylinder 6. Specifically: The rodless chamber oil port of each double-acting piston cylinder 6 is connected in parallel to the four execution oil outlets 2.2 of the hydraulic synchronous distributor 2 through high-pressure oil pipes; the rod chamber oil port of each double-acting piston cylinder 6 is connected in parallel to the return oil port 2.3 of the hydraulic synchronous distributor 2 through high-pressure oil pipes; that is, the rodless chamber oil port is connected to the execution oil outlet 2.2, and the rod chamber oil port is connected to the return oil port 2.3.

[0034] Taking the synchronous lifting condition as an example: when the hydraulic synchronous distributor 2 switches to the synchronous angle position, the oil inlet 2.1 and the four execution oil outlets 2.2 are simultaneously connected. The high-pressure oil flows into the rodless chamber of the four sets of double-acting piston cylinders 6 through the four execution oil outlets 2.2, pushing the piston rod to extend synchronously, so as to realize the overall lifting of the load-bearing structure; the hydraulic oil in the rod chamber of each double-acting piston cylinder 6 flows back to the oil tank 3 through the return oil port 2.3. Taking the single-cylinder lifting condition as an example: when the hydraulic synchronous distributor 2 switches to a certain single-cylinder angle position, the oil inlet 2.1 is only connected to the corresponding one execution oil outlet 2.2, and the high-pressure oil flows only into the rodless chamber of the target double-acting piston cylinder 6, driving the piston rod of that cylinder to extend alone, so as to achieve the individual lifting of that angle; the oil ports of the rodless chambers of the other three double-acting piston cylinders 6 are cut off, keeping the current height unchanged; Under descent conditions, high-pressure oil is supplied in reverse by a dual-plunger pump into the rod chamber of each double-acting piston cylinder 6, pushing the piston rod to retract. The hydraulic oil in the rodless chamber flows back to the oil reservoir 3 through the oil outlet 2.2 and the oil return port 2.3. The top of the piston rod of each double-acting piston cylinder 6 is connected to the load-bearing structure through a ball joint support 7; The cylinder body of the double-acting piston cylinder 6 is made of 27SiMn alloy steel, with a cylinder diameter of Φ63mm±0.02mm, a stroke of 100mm, and a hard chrome plating layer on the piston rod surface with a plating thickness of 0.05-0.08mm. The single-cylinder lifting force is ≥800N. The ball joint support 7 includes a ball head seat and a spherical bearing. The ball head seat is fixedly connected to the top of the piston rod. The spherical bearing is arranged between the ball head seat and the load-bearing structure to form a spherical pair fit. The spherical pair fit allows the piston rod to adaptively deflect within a preset angle range (e.g., ±3°). It should be noted that during the single-cylinder independent leveling process, only one corner's actuating end rises and falls while the other three corners remain stationary. This inevitably causes a certain degree of tilting in the load-bearing structure, resulting in lateral forces and angular deviations at the connection between the piston rod and the load-bearing structure. If the piston rod and the load-bearing structure are rigidly connected, these lateral forces and angular deviations will cause the piston rod to bend and deform or the seals to wear unevenly, and in severe cases, even cause the piston rod to jam. The ±3° adaptive deflection capability provided by the ball joint support seat adapts to the slight tilt changes of the load-bearing structure during single-cylinder independent leveling, ensuring that the piston rod is always subjected to force along its axial direction. This avoids the adverse effects of lateral forces on the piston rod and seals, guaranteeing long-term reliability and seal life. This structural feature works synergistically with the single-cylinder independent leveling function to achieve independent fine-tuning of the four corners. The load-bearing structure includes a grid-shaped frame 8 and a load-equalizing plate 9. The grid-shaped frame 8 is structurally composed of several horizontal and vertical square tubes welded together. When viewed from above, the longitudinal beams and horizontal beams intersect to form several rectangular grid units, presenting an overall grid-shaped lattice layout. The grid-shaped frame described in this application is not limited to a nine-square grid structure formed by the intersection of two horizontal beams and two vertical beams, but refers to a grid-like load-bearing skeleton formed by several vertical beams and several horizontal beams intersecting in the horizontal plane. This skeleton can evenly transfer the load of the handcart switch to the support points at the four corners. The number of vertical beams and horizontal beams can be adjusted according to the load-bearing requirements, and the interval between adjacent beams can be determined according to the support range at the bottom of the handcart switch. The load-equalizing plate 9 is set above the grid-shaped frame 8 to support the handcart switch and evenly distribute the load; The grid-shaped frame 8 is welded from Q345B structural steel square tubes, with square tube dimensions of 100×100×5mm and frame dimensions of 1200×800mm, and is subjected to stress-relief annealing treatment. The load-bearing plate 9 is a polyurethane load-bearing plate with a Shore hardness of 90A, a thickness of 20mm±0.2mm, a flatness error of ≤0.5mm, and a deviation compensation capability of ≥±1.5mm. The first calibration component of the height calibration device is the laser sensor transmitter 10, and the second calibration component of the height calibration device is the laser sensor receiver 11; The laser sensor transmitter 10 is provided with a first magnetic mounting bracket, and the laser sensor receiver 11 is provided with a second magnetic mounting bracket. The first magnetic mounting bracket detachably fixes the laser sensor transmitter 10 to a preset height of the grid frame 8; The second magnetic mounting bracket detachably fixes the laser sensor receiver 11 to the same height as the switch cabinet body 12; the laser sensor receiver 11 is located on the outside of the maintenance trolley slot 13 of the switch cabinet body 12. When the laser sensor receiver 11 receives the light from the laser sensor transmitter 10, it outputs an alignment signal.

[0035] like Figure 4 As shown, the following are embodiments of the leveling method for the hydraulic switch maintenance device provided in this disclosure. This method belongs to the same inventive concept as the hydraulic switch maintenance devices in the above embodiments. For details not described in detail in the embodiments of the leveling method for the hydraulic switch maintenance device, please refer to the embodiments of the hydraulic switch maintenance device described above.

[0036] The method includes the following steps: S1. The handcart switch is installed on the load-bearing structure; It should be noted that placing the handcart switch on the load-bearing structure provides the prerequisite for lifting and adjusting, making the handcart switch and the load-bearing structure an integral part, so that subsequent lifting and adjusting actions can be accurately transmitted to the handcart switch. S2. Switch the hydraulic power unit to synchronous working state to drive the four sets of action execution ends of the actuator to rise and fall synchronously, and perform coarse height adjustment on the load-bearing structure and handcart switch; It should be noted that this step enables the overall rapid lifting and lowering of the load-bearing structure and the handcart switch. In the synchronous working state, the four corners move simultaneously, and a large-scale overall height adjustment can be completed in one operation. Compared with the method of adjusting four points one by one, the coarse adjustment time is significantly shortened. S3. The first calibration component of the height calibration device is set at a preset height of the load-bearing structure, and the second calibration component is set on the switch cabinet body, with the second calibration component cooperating with the first calibration component; It should be noted that in this step, the first and second calibration components of the height calibration device are respectively placed on the side of the handcart switch and the side of the switch cabinet, which forms the basis for height detection; the magnetic installation method of the two calibration components makes installation and disassembly convenient, so as not to affect the normal progress of maintenance work; S4. Obtain the detection results from the height calibration device; If the alignment signal is output, proceed to step S6; If no alignment signal is output, proceed to step S5; It should be noted that the detection results of the height calibration device are obtained and different branches are executed according to whether an alignment signal is output, thus realizing a closed loop of detection and judgment. The output of the alignment signal provides an instruction for the operator, avoiding the uncertainty of relying on the operator's visual judgment in traditional operations. If no signal is output, the fine-tuning process is automatically triggered to realize intelligent closed-loop control. S5. Determine that the handcart switch and the switch cabinet are not at the same preset height. Based on the deviation, determine the target angle from the four corners of the load-bearing structure, switch the hydraulic power unit to the single-cylinder independent working state, drive the action execution end in the actuator corresponding to the target angle to rise and fall independently, and return to step S4. It should be noted that in this step, after determining the misalignment, the target angle is identified, the single-cylinder independent working state is switched, the corresponding action execution end is driven to rise and fall independently, and the process returns to S4 for re-detection, realizing a closed-loop iteration of adjustment and re-detection; ensuring the accuracy of adjustment; the single-cylinder independent working state allows the operator to make precise adjustments to the deviation angle without affecting other aligned angles, avoiding repeated and ineffective operations when adjusting the angle; by positioning each of the four corners one by one until all four corners output alignment signals, the overall levelness of the platform is ensured to meet the requirements; S6. Push the handcart switch from the supporting structure into the switch cabinet to complete the docking; It should be noted that this step involves pushing the handcart switch into the switch cabinet only after the height calibration device outputs an alignment signal, thus achieving precise docking. Compared to the traditional method of pushing the cart by hand, this completely avoids jamming and collision damage caused by misalignment of the contacts, thereby improving operational safety.

[0037] This embodiment achieves precise alignment by rapidly approaching the target height through synchronous coarse adjustment, followed by precise alignment through cyclic judgment and single-cylinder fine adjustment. The linkage between coarse and fine adjustments standardizes the operation process, reduces reliance on operator experience, and ensures the reliability of each docking.

[0038] Furthermore, as a refinement and extension of the specific implementation of the above embodiments, in order to fully illustrate the specific implementation process in this embodiment, another leveling method for a hydraulic switch maintenance device is provided, which includes the following steps: S1. The handcart switch is installed on the load-bearing structure; S2. Switch the hydraulic power unit to synchronous working state to drive the four sets of action execution ends of the actuator to rise and fall synchronously, and perform coarse height adjustment on the load-bearing structure and handcart switch; The specific steps of step S2 are as follows: S21. Rotate the valve core of the hydraulic synchronous distributor to the synchronous angle position, so that the oil inlet is simultaneously connected to the four execution oil outlets through the oil passage groove on the valve core, and the oil return port is cut off, and the hydraulic power unit switches to the synchronous working state. S22. Move the operating handle of the double plunger pump to draw the hydraulic oil in the oil tank into the double plunger pump and pressurize it to the working pressure before outputting it. The high-pressure hydraulic oil is synchronously delivered to the four sets of action actuators through the oil inlet of the hydraulic synchronous distributor, the oil passage groove of the valve core and the four execution oil outlets, driving the four sets of action actuators to extend synchronously, and driving the load-bearing structure and the handcart switch to rise as a whole. S23. When descent is required, reverse the operation handle of the double plunger pump. The hydraulic oil in the four action execution ends flows back to the oil tank through the return port of the hydraulic synchronous distributor, driving the load-bearing structure and handcart switch to descend as a whole. It should be noted that the oil supply of the dual-plunger pump during the synchronous lifting phase is manually driven and does not rely on an external power source. Compared with an electric hydraulic pump station, the manual dual-plunger pump has the following advantages: First, substations or power distribution rooms often lack stable external power supply conditions, and the manual drive method is perfectly suited to the site environment; second, the operator can directly feel the pump's working status through the operating handle, making it easy to adjust the operating rhythm according to the load and prevent platform impact due to excessive oil supply; third, the dual-plunger structure has a more stable output flow and less pressure pulsation compared to the single-plunger structure, ensuring the smoothness of the synchronous lifting of the four sets of actuators. Meanwhile, the opening pressure of the relief valve is set to 10MPa, which matches the working pressure of the dual-plunger pump. When the load on the handcart switch is too large or the piston cylinder moves to the end of its stroke, causing the system pressure to rise to 10MPa, the relief valve automatically opens to release pressure, and the high-pressure oil flows back to the oil tank through the relief valve to avoid system overload damage. In actual operation, the operator can also judge whether the system has reached the maximum working pressure by the working sound of the relief valve, so as to stop the operation in time and ensure the safety of the equipment and the handcart switch. S3. The first calibration component of the height calibration device is set at a preset height of the load-bearing structure, and the second calibration component is set on the switch cabinet body, with the second calibration component cooperating with the first calibration component; The specific steps of step S3 are as follows: S31. Fix the laser sensor transmitter to the preset standard height of the supporting structure using a magnetic mounting bracket; S32. Fix the laser sensor receiver to the switch cabinet at the same standard height as the laser sensor transmitter using a magnetic mounting bracket; S33. Adjust the light emission direction of the laser sensor transmitter to be aligned with the light reception direction of the laser sensor receiver to establish a beam-to-beam relationship between the laser sensor transmitter and the laser sensor receiver; S4. Obtain the detection results from the height calibration device; If the alignment signal is output, proceed to step S6; If no alignment signal is output, proceed to step S5; The specific steps of step S4 are as follows: S41. Identify the status of the indicator lights on the laser sensor receiver as the detection result of the height calibration device; If the indicator light is on, proceed to step S42; If the indicator light does not turn on, proceed to step S43; S42. Determine that the laser sensor receiver has received the light from the laser sensor transmitter, output an alignment signal, and proceed to step S6; S43. If the laser sensor receiver does not receive the light from the laser sensor transmitter and does not output an alignment signal, it indicates that the handcart switch and the switch cabinet are not at the same preset height, proceed to step S5. It should be noted that in the traditional operation of hydraulic lifting platforms, operators usually judge whether the platform is aligned by visually observing the relative position of the platform edge and the cabinet reference mark. This method is greatly affected by the operator's perspective, lighting conditions and subjective judgment, and is prone to misjudgment. More commonly, after the adjustment is completed, the operator directly pushes the handcart switch into the cabinet and judges whether there is any jamming by feel during the push. If there is jamming, the operator will step back and readjust. This repeated test is not only inefficient, but also very likely to cause contact collision damage due to repeated pushing and pulling. In this embodiment, the indicator light on the laser sensor receiver provides visual feedback signals to the operator. When the indicator light is on, it indicates that the optical paths of the transmitter and receiver are perfectly aligned, meaning that the first calibration piece on the support structure and the second calibration piece on the switch cabinet are at the same height, and the handcart switch and the cabinet contact are at a precise docking height. At this time, the operator can be certain that the height is aligned and can push it in directly without visual judgment. This calibration method, which replaces human judgment with optical path on / off, realizes the quantitative judgment of the adjustment result and eliminates the uncertainty of human judgment. S5. Determine that the handcart switch and the switch cabinet are not at the same preset height. Based on the deviation, determine the target angle from the four corners of the load-bearing structure, switch the hydraulic power unit to the single-cylinder independent working state, drive the action execution end in the actuator corresponding to the target angle to rise and fall independently, and return to step S4. The specific steps of step S5 are as follows: S51. Based on the relative deviation between the current position of the load-bearing structure and the switch cabinet, determine the target angles that need to be adjusted from the four corners of the load-bearing structure; S52. Rotate the valve core of the hydraulic synchronous distributor to the single cylinder angle position corresponding to this target angle, so that the oil inlet is connected to only one of the four execution oil outlets through the oil passage groove on the valve core, while the remaining three execution oil outlets and return oil ports are cut off, and the hydraulic power unit switches to the single cylinder independent working state. S53. Move the operating handle of the double plunger pump to deliver high-pressure hydraulic oil through the open actuator outlet to the actuator corresponding to the target angle, driving the actuator to extend or retract independently, so that the area of ​​the target angle in the bearing structure can be raised or lowered independently. S54. Stop operating the handle and return to step S4 to reacquire the detection results of the height calibration device; If the altitude calibration device still does not output an alignment signal, continue to adjust the same target angle and repeat S52 to S54. If the height calibration device outputs an alignment signal, proceed to step S55; S55. Determine that the target angle is aligned, switch to the next target angle to be adjusted, and repeat S52 to S54 until the laser sensor receivers corresponding to the four corners of the supporting structure all output alignment signals, and the adjustment is completed. It should be noted that the operation of determining the target angle from the four corners of the load-bearing structure in step S5 is not in a fixed order, but is determined flexibly by the operator based on the actual situation. For example, if the operator observes that the left front corner of the load-bearing structure is significantly lower while the other three corners are basically level, the left front corner can be prioritized as the target angle for fine-tuning. If all four corners have different degrees of deviation, they can be fine-tuned one by one in any order. Regardless of the order chosen, since the detection results are obtained again after each adjustment by returning to step S4, the adjustment of the previous corner will not be affected by the subsequent adjustments, and each corner is independent and does not interfere with each other. The method of independent corner adjustment here is fundamentally different from the traditional four-point lead screw adjustment. In a traditional screw lifting platform, adjusting the height of one corner often affects the height of adjacent corners, requiring the operator to repeatedly measure and adjust the height of each corner, making the leveling process extremely time-consuming. In this embodiment, since the four sets of action execution ends are independently set at the four corners of the bearing structure, and the height of each corner is independently supported by its corresponding double-acting piston cylinder, the support height of the other three corners remains unchanged when adjusting one corner, thus eliminating the problem of adjustment coupling. With the closed-loop detection feedback of the laser calibration device, the adjustment of each corner is output through the alignment signal, with a clear termination condition, eliminating the need for repeated trial and error, thereby shortening the single leveling time. S6. Push the handcart switch from the load-bearing structure into the switch cabinet to complete the docking.

[0039] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic switch servicing device, characterized in that, Includes a load-bearing structure, hydraulic power unit, actuator, and height calibration device; The actuator is located below and supports the load-bearing structure. The actuator includes four sets of actuating ends, which are respectively located at the four corners of the load-bearing structure. They are used to lift and lower under the drive of the hydraulic power unit, so as to drive the load-bearing structure to lift and lower. The oil outlet of the hydraulic power unit is connected to the actuator. The hydraulic power unit has a synchronous working state and a single-cylinder independent working state. In the synchronous working state, the hydraulic power unit synchronously delivers hydraulic oil to four sets of actuators. In the single-cylinder independent working state, the hydraulic power unit selectively delivers hydraulic oil to at least one set of actuators in the actuator. The height calibration device includes a first calibration component and a second calibration component. The first calibration component is set at a preset height on the load-bearing structure, and the second calibration component is set on the switch cabinet and cooperates with the first calibration component. The height calibration device is used to output an alignment signal when the handcart switch is raised and lowered with the load-bearing structure to the same preset height as the switch cabinet.

2. The hydraulic switch servicing device of claim 1, wherein, The hydraulic power unit includes a dual-plunger pump, a hydraulic synchronizer, an oil reservoir, and a relief valve; The dual-plunger pump is equipped with an operating handle; The outlet of the dual-plunger pump is connected to the inlet of the hydraulic synchronous distributor and the inlet of the relief valve. A dual-plunger pump is used to convert manual driving force into hydraulic energy and amplify the force output when the operating handle is turned. The hydraulic synchronous flow divider has a synchronous gear and several independent gears for each cylinder. The synchronous gear corresponds to the synchronous working state, and the independent gear for each cylinder corresponds to the independent working state for each cylinder. The oil reservoir is connected to the inlet of the dual-plunger pump and the outlet of the overflow valve.

3. The hydraulic switch servicing device of claim 2, wherein, The hydraulic synchronizer includes a valve body and a valve core; The valve core is located inside the valve body and can rotate relative to the valve body and move axially. The valve body is equipped with one oil inlet, four actuation outlets and one return port. The four actuation outlets are respectively connected to four sets of actuation ends, and the return port is used to connect to the oil storage tank. The valve core has an oil passage groove and has a preset synchronization angle position and several single cylinder angle positions. When the valve core rotates to the synchronous angle position, the oil inlet is simultaneously connected to the four actuator oil outlets through the oil passage groove, and the oil return port is cut off, so the hydraulic synchronous flow divider is in synchronous working state. When the valve core rotates to any single cylinder angle position, the oil inlet is connected to only one of the four actuator oil outlets through the oil passage groove, while the remaining three actuator oil outlets and return oil outlets are cut off, and the hydraulic synchronous distributor is in a single cylinder independent working state.

4. The hydraulic switch servicing device of claim 1, wherein, The actuator employs a double-acting piston cylinder; Four sets of double-acting piston cylinders are respectively located at the four corners of the load-bearing structure. The oil outlet of the hydraulic power unit is connected to the rodless chamber oil port or the rod chamber oil port of each double-acting piston cylinder. The top of the piston rod of each double-acting piston cylinder is connected to the load-bearing structure through a ball joint support. The ball joint support includes a ball head seat and a spherical bearing. The ball head seat is fixedly connected to the top of the piston rod, and the spherical bearing is arranged between the ball head seat and the load-bearing structure to form a spherical pair fit. The spherical pair fit allows the piston rod to adaptively deflect within a preset angle range.

5. The hydraulic switch maintenance device according to claim 1, characterized in that, The load-bearing structure includes a grid-like frame and a load-bearing slab; The load-equalizing plate is placed above the grid-shaped frame to support the handcart switch and evenly distribute the load. The first calibration component of the altitude calibration device is the laser sensor transmitter, and the second calibration component of the altitude calibration device is the laser sensor receiver; The laser sensor transmitter is provided with a first magnetic mounting bracket, and the laser sensor receiver is provided with a second magnetic mounting bracket. The first magnetic mounting bracket detachably fixes the laser sensor transmitter to a preset height at the grid-shaped frame; The second magnetic mounting bracket detachably fixes the laser sensor receiver to the same height as the switch cabinet. The laser sensor receiver outputs an alignment signal when it receives light from the laser sensor transmitter.

6. A leveling method using the hydraulic switch maintenance device according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1. The handcart switch is installed on the load-bearing structure; S2. Switch the hydraulic power unit to synchronous working state to drive the four sets of action execution ends of the actuator to rise and fall synchronously, and perform coarse height adjustment on the load-bearing structure and handcart switch; S3. The first calibration component of the height calibration device is set at a preset height of the load-bearing structure, and the second calibration component is set on the switch cabinet body, with the second calibration component cooperating with the first calibration component; S4. Obtain the detection results from the height calibration device; If the alignment signal is output, proceed to step S6; If no alignment signal is output, proceed to step S5; S5. Determine that the handcart switch and the switch cabinet are not at the same preset height. Based on the deviation, determine the target angle from the four corners of the load-bearing structure, switch the hydraulic power unit to the single-cylinder independent working state, drive the action execution end in the actuator corresponding to the target angle to rise and fall independently, and return to step S4. S6. Push the handcart switch from the load-bearing structure into the switch cabinet to complete the docking.

7. The leveling method for the hydraulic switch maintenance device according to claim 6, characterized in that, The specific steps of step S2 are as follows: S21. Rotate the valve core of the hydraulic synchronous distributor to the synchronous angle position, so that the oil inlet is simultaneously connected to the four execution oil outlets through the oil passage groove on the valve core, and the oil return port is cut off, and the hydraulic power unit switches to the synchronous working state. S22. Move the operating handle of the double plunger pump to draw the hydraulic oil in the oil tank into the double plunger pump and pressurize it to the working pressure before outputting it. The high-pressure hydraulic oil is synchronously delivered to the four sets of action actuators through the oil inlet of the hydraulic synchronous distributor, the oil passage groove of the valve core and the four execution oil outlets, driving the four sets of action actuators to extend synchronously, and driving the load-bearing structure and the handcart switch to rise as a whole. S23. When descent is required, reverse the operation handle of the double plunger pump. The hydraulic oil in the four action execution ends flows back to the oil tank through the return port of the hydraulic synchronous distributor, driving the load-bearing structure and handcart switch to descend as a whole.

8. The leveling method for the hydraulic switch maintenance device according to claim 6, characterized in that, The specific steps of step S3 are as follows: S31. Fix the laser sensor transmitter to the preset standard height of the supporting structure using a magnetic mounting bracket; S32. Fix the laser sensor receiver to the switch cabinet at the same standard height as the laser sensor transmitter using a magnetic mounting bracket; S33. Adjust the light emission direction of the laser sensor transmitter to be aligned with the light reception direction of the laser sensor receiver to establish a beam-to-beam relationship between the laser sensor transmitter and the laser sensor receiver.

9. The leveling method for the hydraulic switch maintenance device according to claim 6, characterized in that, The specific steps of step S4 are as follows: S41. Identify the status of the indicator lights on the laser sensor receiver as the detection result of the height calibration device; If the indicator light is on, proceed to step S42; If the indicator light does not turn on, proceed to step S43; S42. Determine that the laser sensor receiver has received the light from the laser sensor transmitter, output an alignment signal, and proceed to step S6; S43. If the laser sensor receiver does not receive the light from the laser sensor transmitter and does not output an alignment signal, it indicates that the handcart switch and the switch cabinet are not at the same preset height, proceed to step S5.

10. The leveling method for the hydraulic switch maintenance device according to claim 6, characterized in that, The specific steps of step S5 are as follows: S51. Based on the relative deviation between the current position of the load-bearing structure and the switch cabinet, determine the target angles that need to be adjusted from the four corners of the load-bearing structure; S52. Rotate the valve core of the hydraulic synchronous distributor to the single cylinder angle position corresponding to this target angle, so that the oil inlet is connected to only one of the four execution oil outlets through the oil passage groove on the valve core, while the remaining three execution oil outlets and return oil ports are cut off, and the hydraulic power unit switches to the single cylinder independent working state. S53. Move the operating handle of the double plunger pump to deliver high-pressure hydraulic oil through the open actuator outlet to the actuator corresponding to the target angle, driving the actuator to extend or retract independently, so that the area of ​​the target angle in the bearing structure can be raised or lowered independently. S54. Stop operating the handle and return to step S4 to reacquire the detection results of the height calibration device; If the altitude calibration device still does not output an alignment signal, continue to adjust the same target angle and repeat S52 to S54. If the height calibration device outputs an alignment signal, proceed to step S55; S55. Determine that the target angle is aligned, switch to the next target angle to be adjusted, and repeat S52 to S54 until the laser sensor receivers corresponding to the four corners of the supporting structure all output alignment signals, and the adjustment is completed.

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