Hydraulic automatic lifting device for carrier loader

Abstract

The utility model provides a hydraulic automatic lifting device for a carrier loader, which comprises a cannon body auxiliary motorized frame, a hydraulic slewing mechanism and a seat plate connecting mechanism, and the cannon body auxiliary motorized frame is arranged on a tail end frame of the carrier loader and is used for fixing a cannon body; the hydraulic rotating mechanism comprises two supporting arms, two hydraulic oil cylinders and a rotating connecting shaft, the rotating connecting shaft is rotatably installed on the gun body auxiliary maneuvering frame, the first ends of the two hydraulic oil cylinders are rotatably installed on the gun body auxiliary maneuvering frame respectively, and the second ends of the two hydraulic oil cylinders are rotatably installed on the two supporting arms; the second ends of the two supporting arms are rotationally installed on the rotary connecting shaft. The seat plate connecting mechanism comprises two seat plate connecting assemblies, and the two seat plate connecting assemblies are correspondingly installed at the first ends of the two supporting arms and used for being detachably connected with a seat plate. According to the hydraulic automatic lifting device for the carrier loader, automatic falling and reset control of the seat plate can be achieved, and operation is easy, convenient and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to automatic lifting equipment technical field, especially a kind of hydraulic automatic lifting device for carrier vehicle. BACKGROUND

[0002] The mortar system mainly uses the vehicle-mounted maneuvering of carrier vehicle, and uses the combat mode of shooting under the vehicle, and can adapt to the combat needs of various terrains. When in use, the mortar body, the seat panel and the foot support are fixed on the carrier vehicle by fixing devices. The maneuvering of the carrier vehicle can meet the requirements of rapid maneuvering in various terrains for the manually carried mortar. However, when the combat mode of shooting near the vehicle is used under field conditions, it is time-consuming and laborious to load or unload the mortar system from the carrier vehicle, and it is difficult to achieve the specified operation time during combat implementation and withdrawal, and personnel injuries and equipment damage are likely to occur. SUMMARY

[0003] The utility model aims at providing a kind of hydraulic automatic lifting device for carrier vehicle, which can solve the problem of difficulty in loading or unloading the existing mortar system from the carrier vehicle.

[0004] The utility model provides a kind of hydraulic automatic lifting device for carrier vehicle, comprising:

[0005] The auxiliary maneuvering frame of the mortar body is installed on the tail end frame of the carrier vehicle, and is used to fix the mortar body.

[0006] The hydraulic rotary mechanism comprises two support arms, two hydraulic cylinders and a rotary connecting shaft, the rotary connecting shaft is rotatably installed on the auxiliary maneuvering frame of the mortar body, the first ends of the two hydraulic cylinders are rotatably installed on the auxiliary maneuvering frame of the mortar body, the second ends of the two hydraulic cylinders are rotatably installed on the positions close to the first ends of the two support arms, and the second ends of the two support arms are rotatably installed on the rotary connecting shaft.

[0007] The seat panel connecting mechanism comprises two seat panel connecting assemblies, the two seat panel connecting assemblies are correspondingly installed on the first ends of the two support arms, and the seat panel connecting mechanism is used for detachable connection with the seat panel.

[0008] According to the hydraulic automatic lifting device for carrier vehicle provided by the utility model, the auxiliary maneuvering frame of the mortar body comprises two connecting seats, a mortar body platform and two cannon hoops, the two connecting seats are parallel to each other, and the two connecting seats are connected and fixed with the girders of the tail end frame of the carrier vehicle; the mortar body platform is welded and fixed on the two connecting seats, and the two cannon hoops are installed and fixed on the left and right ends of the mortar body platform.

[0009] According to the utility model provide a kind of hydraulic automatic lifting device for carrier, each the connecting seat with the barrel platform between welding respectively multiple platform reinforcing support block.

[0010] According to the utility model provide a kind of hydraulic automatic lifting device for carrier, support arm limiting block is respectively installed and fixed at the position corresponding each support arm on the barrel platform.

[0011] According to the utility model provide a kind of hydraulic automatic lifting device for carrier, the rotary connecting shaft is rotatably installed on two connecting seats, two hydraulic oil cylinders are arranged between two connecting seats, and two hydraulic oil cylinders are arranged between two support arms.

[0012] According to the utility model provide a kind of hydraulic automatic lifting device for carrier, the first end of two hydraulic oil cylinders is rotatably installed corresponding with two connecting seats by first support assembly, the first support assembly includes support column, first connecting bolt and first connecting nut, the support column is welded and fixed with the connecting seat, first through-hole is arranged in the support column, the first connecting bolt is connected with the first connecting nut by passing through the first through-hole, and the first end of the hydraulic oil cylinder is rotatably installed on the first connecting bolt between the first connecting nut and the support column.

[0013] According to the utility model provide a kind of hydraulic automatic lifting device for carrier, the second end of two hydraulic oil cylinders is rotatably installed corresponding with two support arms by second support assembly, the second support assembly includes U-shaped support seat, second connecting bolt and second connecting nut, the U-shaped support seat is fixedly installed on the inner side of the support arm, the U-shaped support seat is provided with second through-hole, the second connecting bolt is connected with the second connecting nut by passing through the second through-hole, and the second end of the hydraulic oil cylinder is rotatably installed on the second connecting bolt in the U-shaped support seat.

[0014] According to the utility model provide a kind of hydraulic automatic lifting device for carrier, the seat plate connecting assembly includes seat plate connecting block, L-shaped connecting latch and safety pin, the seat plate connecting block is fixedly installed on the inner side of the support arm, first connecting hole is arranged on the seat plate connecting block, second connecting hole corresponding with the first connecting hole is arranged on the seat plate, the L-shaped connecting latch is provided with the insertion hole matched with the safety pin, one end of the L-shaped connecting latch is inserted and fixed with the safety pin by passing through the first connecting hole and the second connecting hole.

[0015] According to the utility model provide a kind of hydraulic automatic lifting device for carrier, further include hydraulic power unit, the hydraulic power unit is connected with two hydraulic oil cylinders by hydraulic oil pipe respectively.

[0016] The hydraulic automatic lifting device for a carrier vehicle further comprises a wired controller and a wireless remote controller, the wired controller is electrically connected with the hydraulic power unit through a wire, and the wireless remote controller is wirelessly connected with the hydraulic power unit.

[0017] The hydraulic automatic lifting device for a carrier vehicle comprises a barrel auxiliary motorized frame, a hydraulic rotary mechanism and a seat plate connecting mechanism, the barrel auxiliary motorized frame is installed on a tail end frame of the carrier vehicle and is used for fixing a barrel of a mortar, the hydraulic rotary mechanism comprises two supporting arms, two hydraulic cylinders and a rotary connecting shaft, the rotary connecting shaft is rotatably installed on the barrel auxiliary motorized frame, first ends of the two hydraulic cylinders are rotatably installed on the barrel auxiliary motorized frame respectively, second ends of the two hydraulic cylinders are rotatably installed on the two supporting arms at positions close to the first ends respectively, and second ends of the two supporting arms are rotatably installed with the rotary connecting shaft, the seat plate connecting mechanism comprises two seat plate connecting assemblies, the two seat plate connecting assemblies are installed on the first ends of the two supporting arms respectively, and the seat plate connecting mechanism is used for detachably connecting with a seat plate of the mortar. In use, the barrel of the mortar is installed and fixed on the barrel auxiliary motorized frame, the seat plate of the mortar is connected with the seat plate connecting mechanism, then the two hydraulic cylinders are controlled to perform contraction actions respectively, the first ends of the two supporting arms are swung from top to bottom, and the seat plate of the mortar is automatically lowered from the carrier vehicle to realize unloading of the seat plate, the two hydraulic cylinders are controlled to perform extension actions respectively, the first ends of the two supporting arms are swung from bottom to top, and the seat plate of the mortar is automatically raised to the carrier vehicle to realize loading of the seat plate. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0019] Figure 1The first axial drawing of the hydraulic automatic lifting device for the carrying vehicle of the utility model;

[0020] Figure 2 The second axial drawing of the hydraulic automatic lifting device for the carrying vehicle of the utility model;

[0021] Figure 3 The first direction installation schematic view of the first end of the hydraulic cylinder and the connecting seat in the hydraulic automatic lifting device for the carrying vehicle of the utility model;

[0022] Figure 4 The second direction installation schematic view of the first end of the hydraulic cylinder and the connecting seat in the hydraulic automatic lifting device for the carrying vehicle of the utility model;

[0023] Figure 5 The installation schematic view of the second end of the hydraulic cylinder and the supporting arm in the hydraulic automatic lifting device for the carrying vehicle of the utility model.

[0024] Explanation of reference signs:

[0025] 1, supporting arm; 2, hydraulic cylinder; 3, rotary connecting shaft; 4, connecting seat; 5, barrel platform; 6, cannon hoop; 7, platform reinforcing support block; 8, supporting arm limiting block; 9, supporting column; 10, first connecting bolt; 11, first connecting nut; 12, reinforcing rib plate; 13, U-shaped support seat; 14, second connecting bolt; 15, second connecting nut; 16, resonance block; 17, seat plate connecting block; 18, L-shaped connecting latch. DETAILED DESCRIPTION

[0026] The technical solutions of the utility model will be described below in conjunction with embodiments. Obviously, the described embodiments are only some of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0027] In the description of the utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0028] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or implicitly pointing out the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly and specifically limited. In addition, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0029] As Figures 1 to 5 The utility model discloses a hydraulic automatic lifting device for carrying vehicle, including cannon auxiliary motorized frame, hydraulic rotary mechanism and seat plate connecting mechanism.

[0030] The cannon auxiliary motorized frame is installed on the tail end frame of the carrying vehicle, and is used for fixing the cannon body of the mortar.

[0031] The hydraulic rotary mechanism comprises two support arms 1, two hydraulic oil cylinders 2 and a rotary connecting shaft 3, the rotary connecting shaft 3 is rotatably installed on the cannon auxiliary motorized frame, the first ends of the two hydraulic oil cylinders 2 are rotatably installed on the cannon auxiliary motorized frame respectively, the second ends of the two hydraulic oil cylinders 2 are rotatably installed on the positions close to the first ends of the two support arms 1 respectively, and the second ends of the two support arms 1 are rotatably installed with the rotary connecting shaft 3 respectively. The installation position of the rotary connecting shaft 3 on the cannon auxiliary motorized frame is higher than the installation position of the hydraulic oil cylinders 2 on the cannon auxiliary motorized frame.

[0032] The seat plate connecting mechanism comprises two seat plate connecting assemblies, and the two seat plate connecting assemblies are installed on the first ends of the two support arms 1 respectively, and is used for detachably connecting with the seat plate of the mortar.

[0033] In use, the cannon body of the mortar is installed and fixed on the cannon auxiliary motorized frame, the seat plate of the mortar is connected with the seat plate connecting mechanism, then the two hydraulic oil cylinders 2 are controlled to perform contraction action respectively, so that the first ends of the two support arms 1 are swung from up to down, thereby driving the seat plate of the mortar to automatically descend from the carrying vehicle, and the unloading of the seat plate is realized. The two hydraulic oil cylinders 2 are controlled to perform extension action respectively, so that the first ends of the two support arms 1 are swung from down to up, thereby driving the seat plate of the mortar to automatically ascend to the carrying vehicle, and the loading of the seat plate is realized.

[0034] Therefore, by placing the seat plate and the barrel on the hydraulic automatic lifting device for the carrier vehicle, the seat plate of the mortar can be automatically lowered from the carrier vehicle or reset to the carrier vehicle, which is simple and reliable in operation, shortens the loading and unloading time, and improves the timeliness and flexibility of the artillery deployment and transfer, thereby overcoming the problem of difficult operation caused by the complete reliance on manpower to remove the seat plate and the barrel, solving the coordination pressure of the gunner caused by the height and strength difference of the operator, greatly shortening the time of loading and unloading the gun, and improving the combat effectiveness.

[0035] Further, the hydraulic automatic lifting device for the carrier vehicle can empty the original seat plate and barrel fixing position on the carrier vehicle to place other equipment, thereby achieving the purpose of strengthening the firepower support capability.

[0036] Further, when it is inconvenient to construct the seat plate pit, the hydraulic automatic lifting device for the carrier vehicle can also be used to offset part of the recoil force by using the self-gravity of the vehicle, the hydraulic rotary mechanism and the seat plate, so that small charge shooting can be quickly and simply performed, and the scene of weapon practical application is expanded.

[0037] Specifically, the barrel auxiliary mobile frame includes two connecting seats 4, a barrel platform 5 and two cannon hoops 6, the two connecting seats 4 are parallel to each other, and the two connecting seats 4 are respectively connected and fixed with the girders of the tail end frame of the carrier vehicle. The barrel platform 5 is welded and fixed on the two connecting seats 4, and the two cannon hoops 6 are respectively installed and fixed on the left and right ends of the barrel platform 5 through bolts.

[0038] The connecting seat 4 can be made of a steel plate with a thickness of 15 mm, and a 12.9-grade high-strength bolt is used to fix the connecting seat 4 on the girder of the tail end frame of the carrier vehicle.

[0039] The barrel platform 5 can be made of a rectangular steel plate, and the bottom surface of the barrel platform 5 is welded and fixed with the upper ends of the two connecting seats 4.

[0040] In use, the barrel is arranged on the barrel platform 5, and the barrel is installed and fixed through the left and right two cannon hoops 6, which not only reduces the fixed height of the barrel, but also achieves the purpose of quickly and conveniently loading and unloading the barrel.

[0041] Each connecting seat 4 and the barrel platform 5 are respectively welded with a plurality of platform reinforcing support blocks 7, which effectively improve the installation strength and reliability of the barrel platform 5 on the connecting seat 4.

[0042] Specifically, support arm limiting blocks 8 are respectively installed and fixed on the barrel platform 5 at positions corresponding to each support arm 1. By arranging two support arm limiting blocks 8, the upward turning position of each support arm 1 can be limited respectively, so as to avoid excessive turning of each support arm 1.

[0043] Specifically, the rotary connecting shaft 3 is rotatably mounted on the two connecting seats 4, and the two hydraulic cylinders 2 are arranged between the two connecting seats 4 and between the two support arms 1.

[0044] Each support arm 1 is composed of two mutually parallel square steels, and the connecting seat 4 is correspondingly arranged between the two square steels to ensure the reliability of the connection and mounting and improve the overall structural strength of the support arm 1.

[0045] Specifically, the first ends of the two hydraulic cylinders 2 are rotatably mounted on the two connecting seats 4 through the first support assembly, the first support assembly comprises a support column 9, a first connecting bolt 10 and a first connecting nut 11, the support column 9 is welded and fixed with the connecting seat 4, the support column 9 is provided with a first through hole, the first connecting bolt 10 is connected with the first connecting nut 11 after penetrating through the first through hole, and the first end of the hydraulic cylinder 2 is rotatably mounted on the first connecting bolt 10 between the first connecting nut 11 and the support column 9.

[0046] The surface of the first connecting bolt 10 matched with the support column 9 and the first end of the hydraulic cylinder 2 is a smooth surface, and only the end part of the first connecting bolt 10 is provided with threads for thread connection with the first connecting nut 11.

[0047] The connecting seat 4 is provided with a mounting hole, the support column 9 penetrates through the mounting hole and is welded and fixed with the mounting hole. In order to improve the connection strength and reliability between the support column 9 and the connecting seat 4, a plurality of reinforcing rib plates 12 are arranged on the inner and outer surfaces of the connecting seat 4 respectively for welding and fixing with the support column 9.

[0048] Each hydraulic cylinder can bear 1 ton of weight, thereby ensuring the reliability of the device operation.

[0049] Specifically, the second ends of the two hydraulic cylinders 2 are rotatably mounted on the two support arms 1 through the second support assembly, the second support assembly comprises a U-shaped support seat 13, a second connecting bolt 14 and a second connecting nut 15, the U-shaped support seat 13 is welded and fixed on the inner side of the support arm 1, the U-shaped support seat 13 is provided with a second through hole, the support arm 1 is provided with a third through hole, the second connecting bolt 14 penetrates through the third through hole and the second through hole and is connected with the second connecting nut 15, and the second end of the hydraulic cylinder 2 is rotatably mounted on the second connecting bolt 14 in the U-shaped support seat 13.

[0050] The surface of the second connecting bolt 14 matched with the support arm 1 and the U-shaped support seat 13 is a smooth surface, and only the end part of the second connecting bolt 14 is provided with threads for thread connection with the second connecting nut 15.

[0051] Specifically, two resonance blocks 16 are also installed on the rotary connecting shaft 3. When the hydraulic cylinder 2 drives the support arm 1 to turn up to the position, it will contact with the support arm limiting block 8. Because the length of the rotary connecting shaft 3 is relatively long, when the support arm 1 vibrates after contacting with the support arm limiting block 8, the rotary connecting shaft 3 will have a rebound force. By setting two resonance blocks 16, the vibration can be reduced, and the reliability of the device during operation is further improved.

[0052] The rotary connecting shaft 3 can be a steel round bar with a size of φ30mm*1000mm.

[0053] Specifically, the seat plate connecting assembly includes a seat plate connecting block 17, an L-shaped connecting latch 18 and a safety pin (not shown in the figure). The seat plate connecting block 17 is welded and fixed to the inner side of the support arm 1. The seat plate connecting block 17 is provided with a first connecting hole. The seat plate is provided with a second connecting hole corresponding to the first connecting hole. The L-shaped connecting latch 18 is provided with a plug-in hole matched with the safety pin. One end of the L-shaped connecting latch 18 is inserted and fixed with the safety pin after passing through the first connecting hole and the second connecting hole.

[0054] The extension direction of each seat plate connecting block 17 and the axis of the corresponding support arm 1 form an angle of 15-30 degrees. When the support arm 1 is turned up to the position, the seat plate connecting block 17 is inclined and arranged upward. When the support arm 1 is turned down to the position, the seat plate connecting block 17 is arranged close to vertically downward.

[0055] That is, when connecting the seat plate and the seat plate connecting mechanism, first, the seat plate is arranged between the two seat plate connecting blocks 17, and the second connecting hole on the seat plate is arranged corresponding to the first connecting hole on the seat plate connecting block 17. Then, one end of the L-shaped connecting latch 18 is inserted through the first connecting hole and the second connecting hole, respectively, and then fixed by inserting the safety pin into the plug-in hole of the L-shaped connecting latch 18. When disassembling the seat plate, first, the safety pin is removed, and then the L-shaped connecting latch 18 is pulled out.

[0056] When the two support arms 1 are turned down and fall, the safety pin is removed, and the L-shaped connecting latch 18 is pulled out, so that the seat plate can be removed. When the frozen soil layer cannot be dug to set the seat plate pit, the seat plate is used in cooperation with the hydraulic rotary mechanism, and the seat plate does not need to be disassembled. At this time, small charge shooting can be carried out.

[0057] The seat plate connecting block 17 is made of a plate with a thickness of 20mm, the L-shaped connecting latch 18 is made of a plate with a thickness of 20mm, and the safety pin is a B-type elastic split pin.

[0058] Specifically, the hydraulic automatic lifting device for the carrier vehicle further includes a hydraulic power unit (not shown in the figure). The hydraulic power unit is connected with the two hydraulic cylinders 2 through hydraulic oil pipes, respectively, for providing driving force for the extension and retraction of the hydraulic cylinders 2.

[0059] The hydraulic power unit is an existing device, which can be powered by DC 24V direct current, and has a power of 3Kw; an iron plate with a thickness of 4mm is arranged outside the hydraulic power unit to form a protective cover for resisting shrapnel.

[0060] Specifically, the hydraulic automatic lifting device for the carrying vehicle further comprises a wired controller (not shown in the figure) and a wireless remote controller (not shown in the figure), the wired controller is electrically connected with the hydraulic power unit through a wire, and the wireless remote controller is wirelessly connected with the hydraulic power unit.

[0061] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulic automatic lifting device for a transport vehicle, characterized in that, The utility model provides a kind of auxiliary mobile frame for barrel, which is installed on the tail frame of carrier vehicle, and is used for fixing barrel. The hydraulic rotary mechanism includes two support arms, two hydraulic cylinders and a rotary connecting shaft, the rotary connecting shaft is rotatably installed on the auxiliary mobile frame for barrel, the first end of the two hydraulic cylinders is rotatably installed on the auxiliary mobile frame for barrel respectively, the second end of the two hydraulic cylinders is rotatably installed on the two support arms respectively at the position close to the first end, and the second end of the two support arms is rotatably installed on the rotary connecting shaft respectively. The seat plate connecting mechanism includes two seat plate connecting components, the two seat plate connecting components are installed on the first end of the two support arms respectively, and the seat plate connecting mechanism is used for detachable connection with seat plate. The auxiliary mobile frame for barrel includes two connecting seats, a barrel platform and two cannon hoops, the two connecting seats are parallel to each other, and the two connecting seats are connected and fixed with the girder of the tail frame of carrier vehicle respectively.

2. The hydraulic automatic lift device for a cart according to claim 1, characterized by A plurality of platform reinforcing support blocks are welded between each connecting seat and the barrel platform respectively.

3. The hydraulic automatic lift device for a cart according to claim 2, characterized by Support arm limiting blocks are installed and fixed on the barrel platform at positions corresponding to each support arm.

4. The hydraulic automatic lift device for a cart according to claim 2, characterized by The rotary connecting shaft is rotatably installed on the two connecting seats, the two hydraulic cylinders are arranged between the two connecting seats, and the two hydraulic cylinders are arranged between the two support arms.

5. The hydraulic automatic lift device for a cart according to claim 2, wherein The first end of the two hydraulic cylinders is rotatably installed on the two connecting seats through a first support component respectively, the first support component includes a support column, a first connecting bolt and a first connecting nut, the support column is welded and fixed with the connecting seat, the support column is provided with a first through hole, the first connecting bolt is connected with the first connecting nut through the first through hole, and the first end of the hydraulic cylinder is rotatably installed on the first connecting bolt between the first connecting nut and the support column.

6. The hydraulic automatic lift device for a cart according to claim 2, wherein The second end of the two hydraulic cylinders is rotatably installed on the two support arms through a second support component respectively, the second support component includes a U-shaped support seat, a second connecting bolt and a second connecting nut, the U-shaped support seat is fixedly installed on the inner side of the support arm, the U-shaped support seat is provided with a second through hole, the second connecting bolt is connected with the second connecting nut through the second through hole, and the second end of the hydraulic cylinder is rotatably installed on the second connecting bolt in the U-shaped support seat.

7. The hydraulic automatic lift device for a cart according to claim 1, wherein The seat plate connecting component includes a seat plate connecting block, an L-shaped connecting latch and a safety pin, the seat plate connecting block is fixedly installed on the inner side of the support arm, the seat plate connecting block is provided with a first connecting hole, the seat plate is provided with a second connecting hole corresponding to the first connecting hole, the L-shaped connecting latch is provided with a plug hole matched with the safety pin, and one end of the L-shaped connecting latch is plugged and fixed with the safety pin through the first connecting hole and the second connecting hole.

8. The hydraulic automatic lift device for a cart according to claim 1, wherein ​ 9. The hydraulic automatic lift device for a cart according to claim 1, wherein The hydraulic power unit is connected with the two hydraulic oil cylinders through hydraulic oil pipes respectively.

10. The hydraulic automatic lift device for a cart according to claim 9, wherein The hydraulic power unit is connected with the two hydraulic oil cylinders through hydraulic oil pipes respectively.

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