Gravity type fireproof power battery maintenance vehicle

Abstract

The invention discloses a gravity type fireproof power battery maintenance vehicle which comprises a trolley, a water tank integrated in the trolley and a table top located above the water tank. The water tank is connected with the trolley through a shear fork mechanism; the table top is connected with the water tank through a lifting mechanism, and the lifting mechanism drives the table top to ascend and descend; the scissor fork mechanism and the lifting mechanism are connected through a hydraulic system, and the lifting mechanism can drive hydraulic oil to be conveyed to an oil way of the scissor fork mechanism under the gravity action of the power battery and drive the scissor fork mechanism to lift the water tank till the power battery is submerged. According to the maintenance vehicle, the trend of hydraulic oil of the lifting hydraulic cylinder and the shear fork hydraulic cylinder is adjusted in a gravity mode, the lifting hydraulic cylinder and the shear fork hydraulic cylinder are driven to operate correspondingly under the action of gravity, the free falling mode of the battery table top is changed into the mode that the battery table top falls and the water tank rises at the same time, and impact force to equipment caused by free falling of a battery is reduced; the service life of the equipment is greatly prolonged, an external power source is not needed, and the equipment can run reliably when the battery is on fire.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile maintenance, and in particular to a gravity-type fireproof power battery maintenance vehicle for maintaining and preventing fire in power batteries of new energy vehicles. Background Art

[0002] With the increase of new energy vehicles, various battery packs have emerged, but most battery packs are large in size and mass, and may catch fire due to overheating and short circuit during maintenance and charging and discharging. In this case, it is necessary to control the spread of the fire in the shortest possible time to reduce property losses. In addition, the battery occupies a large space and requires more space in the height direction. Batteries in a burning state are extremely dangerous and prone to explosion or electric shock. People should try to stay away from them to a safe area.

[0003] In the prior art, the devices for controlling the spread of fire are generally set up independently, that is, once the battery short-circuit catches fire, the operator needs to quickly transport the battery to the water tank and put it into the water tank to control the fire, but this period of time will cause huge safety problems for the operators. Therefore, the independently set water tank and battery maintenance equipment are not suitable for the current power battery maintenance requirements.

[0004] Therefore, based on the above technical problems, technicians in this field urgently need to develop a gravity-type fire-proof power battery maintenance vehicle for new energy vehicle power battery maintenance and fire prevention. Summary of the invention

[0005] The purpose of the present invention is to provide a gravity-type fireproof power battery maintenance vehicle, which adopts gravity to adjust the direction of the hydraulic oil of the lifting hydraulic cylinder and the scissor hydraulic cylinder, thereby driving the lifting hydraulic cylinder and the scissor hydraulic cylinder to operate accordingly under the action of gravity. The free fall mode of the battery table is changed to the battery table falling and the water tank rising at the same time, which reduces the impact force on the equipment caused by the free fall of the battery, better protects the equipment, greatly extends the service life of the equipment, does not require an external power source, and ensures that the equipment can operate reliably when the battery catches fire.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A gravity-type fireproof power battery maintenance vehicle of the present invention comprises:

[0008] Car;

[0009] a water tank integrated in the trolley, wherein saturated salt water is stored in the water tank; and

[0010] A table top located above the water tank, the table top being used to support a power battery;

[0011] The water tank is connected to the trolley through a scissor mechanism, and the water tank is driven to rise and fall through the scissor mechanism;

[0012] The table top is connected to the water tank through a lifting mechanism, and the table top is driven to rise and fall through the lifting mechanism;

[0013] The scissor mechanism and the lifting mechanism are connected through a hydraulic system, and the lifting mechanism can drive the hydraulic oil to be transported to the oil circuit of the scissor mechanism under the gravity of the power battery and drive the scissor mechanism to lift the water tank to submerge the power battery.

[0014] Furthermore, the trolley comprises:

[0015] Trolley frame;

[0016] A trolley enclosure fixed around the trolley frame, wherein the inner space of the trolley enclosure is an integrated space for a water tank;

[0017] A guide column frame is provided in the middle of the trolley frame, and a guide column is fixed on the guide column frame;

[0018] Casters are arranged at the bottom of the trolley frame.

[0019] Furthermore, the water tank comprises:

[0020] sink body;

[0021] A guide column groove is provided in the water tank body and matches the position of the guide column, and a waterproof accordion cover is installed in the guide column groove, and the guide column passes through the waterproof accordion cover;

[0022] A slide groove is arranged on one side of the bottom of the water tank body, and a fixing seat is arranged on the other side;

[0023] The scissor mechanism is connected to the bottom of the water tank body through the slide groove and the fixing seat.

[0024] Furthermore, the scissor mechanism comprises:

[0025] Scissor arms; and

[0026] A scissor hydraulic cylinder having one end connected to the trolley and the other end connected to the crossbar between the scissor arms;

[0027] The scissor arm is slidably connected to the water tank body through the slide groove, and the other end of the scissor arm is hinged to the water tank body through a fixing seat.

[0028] Furthermore, the table top comprises:

[0029] Countertop frames; and

[0030] Square top blocks are arranged at the four corners of the table frame.

[0031] Furthermore, the lifting mechanism comprises:

[0032] A guide sleeve disposed below the square top block of the table, the guide sleeve being in sliding cooperation with the guide post; and

[0033] A lifting hydraulic cylinder is arranged in the guide sleeve.

[0034] Further, the lifting hydraulic cylinder and the scissor hydraulic cylinder are controlled by a hydraulic system;

[0035] The hydraulic system comprises:

[0036] A hydraulic pump, wherein the hydraulic pump is connected to a hydraulic oil main pipe, and the hydraulic oil main pipe is respectively equipped with an overflow valve and a descending solenoid valve through a hydraulic oil branch pipe;

[0037] A lifting hydraulic cylinder hydraulic oil pipe and a scissor hydraulic cylinder hydraulic oil pipe are connected to the hydraulic oil main pipe;

[0038] The lifting hydraulic cylinder is connected to the hydraulic oil main pipe through a lifting hydraulic cylinder hydraulic oil pipe, and a third stop valve is installed on the lifting hydraulic cylinder hydraulic oil pipe;

[0039] The scissor hydraulic cylinder is connected to the hydraulic oil main pipe through the scissor hydraulic cylinder hydraulic oil pipe, and a second stop valve is installed on the scissor hydraulic cylinder hydraulic oil pipe;

[0040] A driving hydraulic pipe is connected between the hydraulic oil pipe of the lifting hydraulic cylinder and the hydraulic oil pipe of the scissor hydraulic cylinder, and a first stop valve is installed on the driving hydraulic pipe.

[0041] In the above technical solution, the gravity-type fireproof power battery maintenance vehicle provided by the present invention has the following beneficial effects:

[0042] The maintenance vehicle of the present invention adopts gravity to adjust the direction of the hydraulic oil of the lifting hydraulic cylinder and the scissor hydraulic cylinder, thereby driving the lifting hydraulic cylinder and the scissor hydraulic cylinder to operate correspondingly under the action of gravity. The free fall mode of the battery table is changed to the battery table falling and the water tank rising at the same time, which reduces the impact force on the equipment caused by the free fall of the battery, better protects the equipment, and greatly extends the service life of the equipment.

[0043] The maintenance vehicle of the present invention uses the gravity of the power battery as the driving force to drive the hydraulic oil in the lifting hydraulic cylinder to be transported to the scissor hydraulic cylinder and drive the scissor hydraulic cylinder to move to lift the water tank. At the same time, the maintenance vehicle realizes the linkage operation of the lifting hydraulic cylinder 204 and the scissor hydraulic cylinder 402 without an external power source. At the same time, it solves the problem of limited height of the maintenance platform and avoids the problem of failure to work normally due to battery fire and external power mechanism out of control or circuit control. The battery's own weight is used as the power, and the structure is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. It is obvious that the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0045] Figure 1 It is a structural schematic diagram of a gravity-type fireproof power battery maintenance vehicle disclosed in an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of the dimensional requirements between the various structures of the gravity-type fireproof power battery maintenance vehicle disclosed in an embodiment of the present invention;

[0047] Figure 3 A schematic diagram of the structure of a table and a lifting mechanism of a gravity-type fireproof power battery maintenance vehicle disclosed in an embodiment of the present invention;

[0048] Figure 4 A schematic diagram of the structure of the water tank of the gravity-type fireproof power battery maintenance vehicle disclosed in an embodiment of the present invention Figure 1 ;

[0049] Figure 5 A schematic diagram of the structure of the water tank of the gravity-type fireproof power battery maintenance vehicle disclosed in an embodiment of the present invention Figure 2 ;

[0050] Figure 6 It is a structural schematic diagram of the scissor mechanism of the gravity-type fireproof power battery maintenance vehicle disclosed in an embodiment of the present invention;

[0051] Figure 7 A schematic diagram of the structure of a small vehicle of a gravity-type fireproof power battery maintenance vehicle disclosed in an embodiment of the present invention;

[0052] Figure 8 The present invention is a flow chart of the control of the hydraulic system of the gravity-type fireproof power battery maintenance vehicle disclosed in the embodiment of the present invention.

[0053] Description of reference numerals:

[0054] 1. Power battery; 2. Countertop; 3. Sink; 4. Scissor mechanism; 5. Trolley;

[0055] 201, square top block; 202, table frame; 203, guide sleeve; 204, lifting hydraulic cylinder;

[0056] 301, water tank body; 302, waterproof accordion cover; 303, guide groove; 304, fixing seat;

[0057] 401, scissor arm; 402, scissor hydraulic cylinder;

[0058] 501, trolley frame; 502, trolley enclosure; 503, guide column; 504, caster; 505, guide column frame;

[0059] 601, hydraulic oil main pipe; 602, lifting hydraulic cylinder hydraulic oil pipe; 603, scissor hydraulic cylinder hydraulic oil pipe; 604, driving hydraulic pipe;

[0060] Y01, hydraulic pump; Y02, overflow valve; Y03, lowering solenoid valve; Y04, first stop valve;

[0061] Y05, the second stop valve; Y06, the third stop valve. DETAILED DESCRIPTION

[0062] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0063] See also Figures 1 to 8 As shown;

[0064] A gravity-type fireproof power battery maintenance vehicle of this embodiment includes:

[0065] Car 5;

[0066] A water tank 3 integrated in the trolley 5, wherein saturated salt water is stored in the water tank 3; and

[0067] A table top 2 is located above the water tank 3, and the table top 2 is used to support the power battery 1;

[0068] The water tank 3 is connected to the trolley 5 through the scissor mechanism 4, and the water tank 3 is driven to rise and fall through the scissor mechanism 4;

[0069] The table top 2 is connected to the water tank 3 through a lifting mechanism, and the table top 2 is driven to rise and fall through the lifting mechanism;

[0070] The scissor mechanism 4 and the lifting mechanism are connected through a hydraulic system, and the lifting mechanism can drive the hydraulic oil to be delivered to the oil circuit of the scissor mechanism 4 under the gravity of the power battery 1 and drive the scissor mechanism 4 to lift the water tank 3 to submerge the power battery 1.

[0071] Specifically, this embodiment discloses a gravity-type fireproof power battery maintenance vehicle, which includes a trolley 5, a water tank 3 and a table 2, wherein the power battery 1 is supported above the table 2, and an appropriate amount of saturated salt water is stored in the water tank 3. The saturated salt water discharges the battery together with the positive and negative electrodes of the power supply while extinguishing the fire, to ensure that after the fire is extinguished, there will be no accidental electric shock when people approach. The discharge process belongs to the electrolysis of water chemical reaction, and its products are only hydrogen and oxygen, which is green and pollution-free and will not have a negative impact on the environment. The device of this embodiment adopts a gravity drive method, that is, the water tank 3 is connected to the trolley 5 through a scissor mechanism 4, so that the water tank 3 is driven to rise and fall by the scissor mechanism 4, and the table 2 is movably connected to the water tank 3 through a lifting mechanism, so that the table 2 is driven to rise and fall by the lifting mechanism. In the hydraulic system of the present embodiment, after the corresponding valve is opened, the hydraulic oil driven by the weight of the table 2 and the power battery 1 can be delivered to the scissor mechanism 4, thereby driving the scissor mechanism 4 to drive the water tank 3 to rise, so that the descending power battery 1 and the rising water tank 3 can allow the power battery 1 to invade the saturated salt water in the water tank 3.

[0072] The technical issues that need to be considered in the design are: Under the premise of meeting the ideal height of 1200mm for human-machine operation of battery maintenance, the liquid level in the water tank 3 submerging the battery by more than 200mm, the upper edge of the water tank 3 being 50mm away from the liquid level, the general battery height is close to 250mm, and 100mm of space is reserved to ensure that all kinds of forklift forks can smoothly pick up the battery, there is only 1200mm (ground height) - 250mm (battery height) - 100mm (forklift fork space) = 850mm height space left. Figure 2 As shown, therefore, considering these technical problems, only the scissor mechanism 4 can satisfy the stable sinking of the battery in this space, but the sealing of the scissor mechanism 4 increases great difficulties.

[0073] Preferably, the trolley 5 of this embodiment includes a trolley frame 501, a trolley enclosure 502 fixed around the trolley frame 501, and the internal space of the trolley enclosure 502 is the integrated space of the water tank 3; a guide column frame 505 is arranged in the middle position of the trolley frame 501, and a guide column 503 is fixed on the guide column frame 505; casters 504 are arranged at the bottom of the trolley frame 501.

[0074] Preferably, the water tank 3 of this embodiment includes a water tank body 301, a guide column groove provided in the water tank body 301 and matching the position of the guide column 503, and a waterproof accordion cover 302 is installed in the guide column groove, and the guide column 503 passes through the waterproof accordion cover 302; a slide groove 303 is provided on one side of the bottom of the water tank body 301, and a fixing seat 304 is provided on the other side;

[0075] The scissor mechanism 4 of this embodiment is connected to the bottom of the water tank body 301 through the slide groove 303 and the fixing seat 304 .

[0076] Considering that the scissor mechanism 4 needs to drive the water tank 3 to rise and fall, the bottom of the water tank body 301 is provided with a slide 303 and a fixed seat 304 that cooperate with the scissor arm 401 of the scissor mechanism 4. The fixed seat 304 is connected in a hinged manner, and the slide 303 is connected in a sliding and hinged manner, so that the scissor movement of the scissor arm 401 can be coordinated to drive the water tank 3 to rise and fall. In order to cooperate with the guide column 503 of the trolley 5, a guide column groove is opened at the corresponding position of the water tank body 301, and the guide column 503 passes through the corresponding guide column groove, and then a waterproof accordion cover 302 is installed at the guide column groove. In this embodiment, a retractable waterproof accordion cover 302 is installed between the water tank body 301 and the table 2 to isolate the lifting hydraulic cylinder 204 and the guide sleeve 203 from water, so as to prevent the lifting hydraulic cylinder 204 and the guide sleeve 203 from rusting due to long-term immersion. In this way, the sealing problem of the scissor mechanism 4 and the lifting mechanism can be solved.

[0077] Preferably, the scissor mechanism 4 of this embodiment includes a scissor arm 401; and a scissor hydraulic cylinder 402, one end of which is connected to the trolley 5 and the other end is connected to the cross bar between the scissor arms 401; the scissor arm 401 is slidably connected to the water tank body 301 through a slide groove 303, and the other end of the scissor arm 401 is hinged to the water tank body 301 through a fixed seat 304.

[0078] Preferably, the table top 2 of this embodiment includes a table top frame 202 and square top blocks 201 arranged at the four corners of the table top frame 202. The table top 2 is welded with a 3mm thick square steel pipe frame, and the four corners are welded with connecting plates and cylinder rod end connectors. The corresponding positions of the connecting plates are opened for assembling the top block 201, the guide sleeve 203 and the waterproof accordion sleeve 302. The table top structure of this embodiment is stable, which is convenient for battery loading and unloading, and can ensure that when the device is in effect, the table top will not be deformed due to uneven force, causing problems such as uneven height of the table top.

[0079] Preferably, the lifting mechanism of this embodiment includes: a guide sleeve 203 disposed below the square top block 201 of the table top 2 , the guide sleeve 203 slidably cooperates with the guide column 503 ; and a lifting hydraulic cylinder disposed in the guide sleeve 203 .

[0080] In order to achieve the technical requirements of the gravity drive of this embodiment, the lifting hydraulic cylinder 204 and the scissor hydraulic cylinder 402 of this embodiment are controlled by a hydraulic system;

[0081] The hydraulic system of this embodiment includes:

[0082] Hydraulic pump Y01, the hydraulic pump Y01 is connected to the hydraulic oil main pipe 601, and the hydraulic oil main pipe 601 is respectively installed with an overflow valve Y02 and a descending solenoid valve Y03 through a hydraulic oil branch pipe;

[0083] The hydraulic oil main pipe 601 is connected to a lifting hydraulic cylinder hydraulic oil pipe 602 and a scissor hydraulic cylinder hydraulic oil pipe 603;

[0084] The lifting hydraulic cylinder 204 is connected to the hydraulic oil main pipe 601 through the lifting hydraulic cylinder hydraulic oil pipe 602, and a third stop valve Y06 is installed on the lifting hydraulic cylinder hydraulic oil pipe 602;

[0085] The scissor hydraulic cylinder 402 is connected to the hydraulic oil main pipe 601 through the scissor hydraulic cylinder hydraulic oil pipe 603, and a second stop valve Y05 is installed on the scissor hydraulic cylinder hydraulic oil pipe 602;

[0086] A driving hydraulic pipe 604 is connected between the lifting hydraulic cylinder hydraulic oil pipe 602 and the scissor hydraulic cylinder hydraulic oil pipe 603 , and a first stop valve Y04 is installed on the driving hydraulic pipe 604 .

[0087] The working principle of the hydraulic control system of this embodiment is as follows: open the third stop valve Y06, and the hydraulic oil is charged into the lifting hydraulic cylinder 204 and the lifting hydraulic cylinder hydraulic pipeline 602. When the lifting hydraulic cylinder 204 is in the extended state, the third stop valve Y06 is closed; open the second stop valve Y05, and the hydraulic oil is charged into the scissor hydraulic cylinder 402 and the scissor hydraulic cylinder hydraulic pipeline 603. When the scissor hydraulic cylinder 402 is in the retracted state, the second stop valve Y05 is closed; the operating maintenance personnel can carry out the battery maintenance work normally;

[0088] If an accident such as a battery fire occurs, the personnel immediately manually open the first stop valve Y04 and evacuate the scene. At this time, the lifting hydraulic cylinder 204 retracts the battery and sinks steadily. At the same time, the scissor hydraulic cylinder 402 extends to lift the water tank, and the battery sinks into the water to extinguish the fire. After the fire is extinguished and the battery is discharged, the first stop valve Y04 is closed, and the third stop valve Y06 is opened. Hydraulic oil is filled into the lifting hydraulic cylinder 204 and the pipeline. The lifting hydraulic cylinder 204 is in the extended state, the third stop valve Y06 is closed, and the second stop valve Y05 is opened. Under the action of the dead weight of the water tank and water, the scissor hydraulic cylinder 402 is in the retracted state, and the second stop valve Y05 is closed, and the next battery maintenance work can be carried out.

[0089] In the above technical solution, the gravity-type fireproof power battery maintenance vehicle provided by the present invention has the following beneficial effects:

[0090] The maintenance vehicle of the present invention adopts gravity to adjust the direction of the hydraulic oil of the lifting hydraulic cylinder 204 and the scissor hydraulic cylinder 402, thereby driving the lifting hydraulic cylinder 204 and the scissor hydraulic cylinder 402 to operate correspondingly under the action of gravity, and the free fall mode of the battery table 2 is changed to the battery table falling and the water tank 3 rising at the same time, which reduces the impact force on the equipment caused by the free fall of the battery, better protects the equipment, and greatly extends the service life of the equipment.

[0091] The maintenance vehicle of the present invention uses the gravity of the power battery as the driving force to drive the hydraulic oil in the lifting hydraulic cylinder 204 to be transported to the scissor hydraulic cylinder 402 and drive the scissor hydraulic cylinder 402 to move to lift the water tank 3. The maintenance vehicle realizes the linkage operation of the lifting hydraulic cylinder 204 and the scissor hydraulic cylinder 402 without an external power source. At the same time, it solves the problem of limited height of the maintenance platform and avoids the problem of failure to work normally due to battery fire and external power mechanism out of control or circuit control. The battery's own weight is used as the power, and the structure is more reliable.

[0092] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. Gravity-type fireproof power battery maintenance vehicle, characterized in that: The maintenance vehicle includes: Cart (5); a water tank (3) integrated in the trolley (5), wherein saturated salt water is stored in the water tank (3); and a table top (2) located above the water tank (3), the table top (2) being used to support the power battery (1); The water tank (3) is connected to the trolley (5) via a scissor mechanism (4), and the water tank (3) is driven to rise and fall via the scissor mechanism (4); The table top (2) is connected to the water tank (3) via a lifting mechanism, and the table top (2) is driven to rise and fall via the lifting mechanism; The scissor mechanism (4) and the lifting mechanism are connected via a hydraulic system, and the lifting mechanism can drive the hydraulic oil to be transported to the oil circuit of the scissor mechanism (4) under the action of the gravity of the power battery (1) and drive the scissor mechanism (4) to lift the water tank (3) until the power battery (1) is submerged.

2. The gravity-type fireproof power battery maintenance vehicle according to claim 1 is characterized in that: The trolley (5) comprises: Trolley frame (501); A trolley panel (502) fixed on the periphery of the trolley frame (501), wherein the internal space of the trolley panel (502) is an integrated space for the water tank (3); A guide column frame (505) is provided in the middle of the trolley frame (501), and a guide column (503) is fixed on the guide column frame (505); Casters (504) are arranged at the bottom of the trolley frame (501).

3. The gravity-type fireproof power battery maintenance vehicle according to claim 2 is characterized in that: The water tank (3) comprises: Sink body(301); A guide column groove is provided on the water tank body (301) and matches the position of the guide column (503), and a waterproof accordion cover (302) is installed in the guide column groove, and the guide column (503) passes through the waterproof accordion cover (302); A slide groove (303) is provided on one side of the bottom of the water tank body (301), and a fixing seat (304) is provided on the other side; The scissor mechanism (4) is connected to the bottom of the water tank body (301) via the slide groove (303) and the fixing seat (304).

4. The gravity-type fireproof power battery maintenance vehicle according to claim 3 is characterized in that: The scissor mechanism (4) comprises: Scissor arms (401); and A scissor hydraulic cylinder (402) having one end connected to the trolley (5) and the other end connected to the crossbar between the scissor arms (401); The scissor arm (401) is slidably connected to the water tank body (301) via the slide groove (303), and the other end of the scissor arm (401) is hinged to the water tank body (301) via a fixing seat (304).

5. The gravity-type fireproof power battery maintenance vehicle according to claim 4 is characterized in that: The table top (2) comprises: a table frame (202); and Square top blocks (201) are arranged at the four corners of the table frame (202).

6. The gravity-type fireproof power battery maintenance vehicle according to claim 5 is characterized in that: The lifting mechanism comprises: A guide sleeve (203) disposed below the square top block (201) of the table top (2), the guide sleeve (203) being slidably matched with the guide column (503); and A lifting hydraulic cylinder (204) is arranged in the guide sleeve (203).

7. The gravity-type fireproof power battery maintenance vehicle according to claim 6 is characterized in that: The lifting hydraulic cylinder (204) and the scissor hydraulic cylinder (402) are controlled by a hydraulic system; The hydraulic system comprises: A hydraulic pump (Y01), wherein the hydraulic pump (Y01) is connected to a hydraulic oil main pipe (601), and the hydraulic oil main pipe (601) is respectively equipped with an overflow valve (Y02) and a descending solenoid valve (Y03) through a hydraulic oil branch pipe; A lifting hydraulic cylinder hydraulic oil pipe (602) and a scissor hydraulic cylinder hydraulic oil pipe (603) are connected to the hydraulic oil main pipe (601); The lifting hydraulic cylinder (204) is connected to the hydraulic oil main pipe (601) via a lifting hydraulic cylinder hydraulic oil pipe (602), and a third stop valve (Y06) is installed on the lifting hydraulic cylinder hydraulic oil pipe (602); The scissor hydraulic cylinder (402) is connected to the hydraulic oil main pipe (601) via a scissor hydraulic cylinder hydraulic oil pipe (603), and a second stop valve (Y05) is installed on the scissor hydraulic cylinder hydraulic oil pipe (603); A driving hydraulic pipe (604) is connected between the lifting hydraulic cylinder hydraulic oil pipe (602) and the scissor hydraulic cylinder hydraulic oil pipe (603), and a first stop valve (Y04) is installed on the driving hydraulic pipe (604).

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