Hydraulic lifting device for dump truck

Abstract

The invention discloses a hydraulic lifting device for a dumper, and relates to the technical field of hydraulic lifting devices.The hydraulic lifting device comprises a cross rod, a lifting mechanism is installed on the side wall of the cross rod, the lifting mechanism is used for lifting a container of the dumper, and the lifting mechanism comprises a first telescopic mechanism, a second telescopic mechanism and a third telescopic mechanism; the third telescopic mechanism comprises a second hinge block, the second hinge block is arranged outside the cross rod in a sleeving mode, the second hinge block is rotationally connected with the cross rod, a sleeve is fixedly connected to the top of the second hinge block, and a damping mechanism and the like are arranged in the sleeve in a sleeving mode. The sliding cylinder drives the first cylinder body to move downwards to extrude hydraulic oil in the second cylinder body, the hydraulic oil flows between the cylinder bodies and the groove body through the small-diameter circulation holes, the flowing resistance is increased, and the damping effect is achieved. When hydraulic oil flows in, air in the groove body is compressed, and the damping effect is further enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic lifting devices, and in particular to a hydraulic lifting device for a dump truck. Background Art

[0002] Dump trucks, as a special type of transport vehicle, play an indispensable role in logistics, construction, mining and other fields. They have the function of automatic loading and unloading of goods. Through their unique hydraulic cylinder system, they can quickly lift the cargo box to a certain height to achieve rapid dumping of goods, thus greatly improving work efficiency. At the same time, the cargo box design of dump trucks usually has a large capacity, which can transport a large amount of materials at one time, meeting the needs of different industries for large-scale material transportation.

[0003] However, despite the many advantages of dump trucks in the field of transportation, their hydraulic cylinder systems are often faced with various failure risks. Among them, the rapid retraction problem caused by the hydraulic cylinder losing pressure due to failure is particularly prominent. When the hydraulic cylinder loses pressure, the cargo box that should have been lifted smoothly will suddenly lose support and fall rapidly. Due to the heavy weight and large size of the cargo box itself, this rapid fall can easily cause the cargo box to collide with the dump truck body. This collision will not only cause serious damage to the cargo box and the vehicle, but may even cause safety accidents, posing a threat to the personal safety of the driver and surrounding people.

[0004] The purpose of the invention is to solve the problem of rapid retraction of the hydraulic cylinder of a dump truck due to pressure loss caused by a fault, and to avoid the problem of damage caused by collision between the cargo box and the dump truck itself. Summary of the invention

[0005] In order to solve the problem of rapid retraction of the dump truck hydraulic cylinder due to pressure loss due to failure and to avoid damage caused by collision between the cargo box and the dump truck itself, the present invention adopts the following technical solution: A hydraulic lifting device for a dump truck comprises a cross bar, a side wall of which is provided with a lifting mechanism, and the lifting mechanism is used to lift a cargo box of the dump truck; The lifting mechanism comprises a first telescopic mechanism, a second telescopic mechanism and a third telescopic mechanism, the third telescopic mechanism comprises a second hinge block, the second hinge block is sleeved outside the cross bar, the second hinge block is rotatably connected to the cross bar, a sleeve is fixedly connected to the top of the second hinge block, a damping mechanism is sleeved inside the sleeve, and the damping mechanism is fixedly connected to the top of the second hinge block; The damping mechanism comprises a second cylinder, the second cylinder is provided with a groove, a plurality of flow holes are provided on the inner cavity side wall of the second cylinder, the inner cavity of the second cylinder is connected with the groove through the flow holes, the volume of the groove is larger than the inner cavity of the second cylinder, the inner cavity of the second cylinder is filled with hydraulic oil, a cylinder cover is provided on the top of the second cylinder, and the cylinder cover is threadedly connected with the second cylinder; The second telescopic mechanism comprises a sliding cylinder, a plurality of through holes are provided on the top of the sliding cylinder, a fourth piston is fixedly connected to the bottom end of the sliding cylinder, the sliding cylinder and the fourth piston are both sleeved in the sleeve, the fourth piston is slidably connected to the inner cavity of the sleeve, a plurality of infusion grooves are provided at the bottom of the sliding cylinder, a first cylinder is fixedly connected to the top of the inner cavity of the sliding cylinder, the first cylinder is filled with hydraulic oil, a second piston is fixedly connected to the bottom of the first cylinder, one end of the first cylinder and the second piston are both sleeved in the second cylinder through a cylinder cover, and the second piston is slidably connected to the inner cavity of the second cylinder; The first telescopic mechanism includes a first piston, which is sleeved outside the first cylinder, the first piston is slidably connected to the first cylinder, the first piston is slidably connected to the inner wall of the sliding cylinder, the top of the first piston is fixedly connected to a plurality of support rods, one end of the support rod is arranged outside the sliding cylinder through a through hole, the top of the support rod is fixedly connected to a first hinge block, the bottom of the first hinge block is fixedly connected to a sliding rod, the sliding rod includes a rod body and a third piston, the third piston is fixedly connected to the bottom end of the rod body, one end of the rod body and the third piston both pass through the sliding cylinder and the top of the first cylinder and are arranged in the first cylinder, the third piston is slidably connected to the inner cavity of the first cylinder, and the third piston is provided with a plurality of through grooves.

[0006] In a hydraulic lifting device for a dump truck as described above, buffer mechanisms are installed at both ends of the cross bar, and the buffer mechanism includes a base, and the base is fixedly connected to the cross bar. An air pump is installed in the base, and the air outlet of the air pump is fixedly connected to an air intake pipe. One end of the air intake pipe passes through the side wall of the base and is arranged outside the base. A one-way air valve is installed in the air intake pipe, and the top of the base is fixedly connected to a supporting mechanism.

[0007] In a hydraulic lifting device for a dump truck as described above, the supporting mechanism includes a pillar, the pillar is fixedly connected to a base, an air bag is fixedly connected to the top of the pillar, one end of the air inlet pipe passes through the side wall of the pillar and is arranged inside the pillar, and an exhaust valve is installed on the side wall of the pillar.

[0008] In the hydraulic lifting device for a dump truck as described above, a telescopic rod is sleeved inside the pillar, the bottom end of the telescopic rod is fixedly connected to the top of the base, and the top end of the telescopic rod is fixedly connected to the top of the inner cavity of the airbag.

[0009] In the hydraulic lifting device for a dump truck as described above, the top of the airbag is fixedly connected with a rubber pad, and the rubber pad is used to protect the top of the airbag.

[0010] In a hydraulic lifting device for a dump truck as described above, the air pump is electrically connected to a controller, the controller has a program for controlling the air pump pumping and the pumping time, the controller has a program for controlling the hydraulic oil input and sleeve extraction, the controller has a program for controlling the exhaust valve switch, and the controller is electrically connected to a control panel, and the control panel is used to control various programs of the controller.

[0011] In the hydraulic lifting device for a dump truck as described above, the material of the airbag is canvas.

[0012] In the hydraulic lifting device for a dump truck as described above, the top of the sleeve is covered with a cylinder head, and the cylinder head is threadedly connected to the sleeve.

[0013] In the hydraulic lifting device for a dump truck as described above, a flange is provided on the outer sleeve, the flange is fixedly connected to the sleeve, a plurality of threaded holes are formed on the flange and the cylinder head, bolts are provided in the threaded holes, and the cylinder head and the flange are fixedly connected by bolts.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, a damping mechanism is designed in the third telescopic mechanism. When the lifting mechanism loses pressure, the sliding cylinder drives the first cylinder to move downward, squeezing the hydraulic oil in the second cylinder. The hydraulic oil flows between the cylinder and the tank through the small-diameter flow hole, increasing the flow resistance and forming a damping effect. The tank volume is larger than the cylinder. When the hydraulic oil flows in, it compresses the tank air, further enhancing the damping effect. This design effectively slows down the descent speed of the cargo box, prevents collisions, and improves safety. 2. In the present invention, when the first telescopic mechanism loses pressure, the sliding rod drives the third piston to slide down in the first cylinder filled with hydraulic oil, and the through groove on the piston allows the hydraulic oil to flow. Since the through groove has a small diameter, the flow resistance is increased, thereby forming a damping effect. When the hydraulic cylinder loses pressure, this design effectively slows down the retraction speed of the first telescopic mechanism; 3. In the present invention, when the lifting mechanism is controlled by the control panel to lift the cargo box, the air pump will start synchronously and pump air into the pillar to expand the airbag. The air pump pumping time is controlled by the program to avoid damage to the airbag. After the airbag is expanded, it is higher than the lifting mechanism. When the lifting mechanism is controlled to retract, the exhaust valve is opened synchronously, and the airbag is deflated to restore to its original state. When the lifting mechanism fails, the exhaust valve will not open, and the airbag will remain in an expanded state to provide a buffer for the cargo box and reduce collision damage.

[0015] In summary, the present invention solves the problem of rapid retraction of the dump truck's hydraulic cylinder due to pressure loss due to a fault, and avoids the problem of damage caused by collision between the cargo box and the dump truck itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a structural schematic diagram of a hydraulic lifting device for a dump truck of the present invention; Figure 2 A cross-sectional view of a lifting mechanism of a hydraulic lifting device for a dump truck of the present invention; Figure 3 It is a structural schematic diagram of a first telescopic mechanism of a hydraulic lifting device for a dump truck of the present invention; Figure 4 A cross-sectional view of a second telescopic mechanism of a hydraulic lifting device for a dump truck of the present invention; Figure 5 It is a structural schematic diagram of a sliding rod of a hydraulic lifting device for a dump truck of the present invention; Figure 6 A cross-sectional view of a third telescopic mechanism of a hydraulic lifting device for a dump truck of the present invention; Figure 7 A cross-sectional view of a damping mechanism of a hydraulic lifting device for a dump truck of the present invention; Figure 8 It is a structural schematic diagram of a cylinder cover of a hydraulic lifting device for a dump truck of the present invention; Fig. 9 It is a structural schematic diagram of a buffer mechanism of a hydraulic lifting device for a dump truck of the present invention; Fig.10 It is a structural schematic diagram of a base of a hydraulic lifting device for a dump truck of the present invention; Fig.11 It is a structural schematic diagram of a supporting mechanism of a hydraulic lifting device for a dump truck of the present invention; Fig.12 The present invention is a control system block diagram of an air pump of a hydraulic lifting device for a dump truck.

[0017] The serial numbers in the figure are: 1, cross bar; 2, lifting mechanism; 201, first telescopic mechanism; 202, second telescopic mechanism; 203, third telescopic mechanism; 204, first piston; 205, support rod; 206, first hinge block; 207, second piston; 208, first cylinder; 209, through hole; 210, sliding rod; 211, rod body; 212, third piston; 213, through groove; 214, sleeve; 215, flange; 216, cylinder head; 217, second hinge block; 218, hydraulic oil inlet and outlet pipes; 219, damping mechanism; 220, second cylinder; 221, tank body; 222, flow hole; 223, cylinder cover; 225, infusion tank; 226, fourth piston; 227, sliding cylinder; 3, buffer mechanism; 301, base; 302, supporting mechanism; 303, exhaust valve; 304, air inlet pipe; 305, one-way air valve; 306, air pump; 307, pillar; 308, air bag; 309, rubber pad; 310, telescopic rod. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Embodiment 1: This embodiment provides a hydraulic lifting device for a dump truck, see Figure 1-11 , including a cross bar 1, a side wall of the cross bar 1 is installed with a lifting mechanism 2, and the lifting mechanism 2 is used to lift the cargo box of the dump truck.

[0020] The lifting mechanism 2 includes a first telescopic mechanism 201, a second telescopic mechanism 202 and a third telescopic mechanism 203. The third telescopic mechanism 203 includes a second hinge block 217. The second hinge block 217 is sleeved outside the cross bar 1. The second hinge block 217 is rotatably connected to the cross bar 1. The top of the second hinge block 217 is fixedly connected with a sleeve 214. A damping mechanism 219 is sleeved inside the sleeve 214. The damping mechanism 219 is fixedly connected to the top of the second hinge block 217.

[0021] The damping mechanism 219 includes a second cylinder 220, which is provided with a groove 221. The inner cavity side wall of the second cylinder 220 is provided with a plurality of flow holes 222. The inner cavity of the second cylinder 220 is connected with the groove 221 through the flow holes 222. The volume of the groove 221 is larger than that of the inner cavity of the second cylinder 220. The inner cavity of the second cylinder 220 is filled with hydraulic oil. A cylinder cover 223 is provided on the top of the second cylinder 220, and the cylinder cover 223 is threadedly connected to the second cylinder 220.

[0022] The second telescopic mechanism 202 includes a sliding cylinder 227, a plurality of through holes 209 are provided at the top of the sliding cylinder 227, a fourth piston 226 is fixedly connected to the bottom of the sliding cylinder 227, the sliding cylinder 227 and the fourth piston 226 are both sleeved in the sleeve 214, the fourth piston 226 is slidably connected to the inner cavity of the sleeve 214, a plurality of infusion grooves 225 are provided at the bottom of the sliding cylinder 227, a first cylinder 208 is fixedly connected to the top of the inner cavity of the sliding cylinder 227, the first cylinder 208 is filled with hydraulic oil, and a second cylinder 208 is fixedly connected to the bottom of the first cylinder 208. The piston 207, one end of the first cylinder 208 and the second piston 207 are all sleeved in the second cylinder 220 through the cylinder cover 223, and the second piston 207 is slidably connected to the inner cavity of the second cylinder 220. The top of the sleeve 214 is covered with a cylinder cover 216, and the cylinder cover 216 is threadedly connected to the sleeve 214. A flange 215 is provided on the outer sleeve of the sleeve 214, and the flange 215 is fixedly connected to the sleeve 214. The flange 215 and the cylinder cover 216 are both provided with a plurality of threaded holes, and bolts are sleeved in the threaded holes. The cylinder cover 216 and the flange 215 are fixedly connected by bolts.

[0023] The first telescopic mechanism 201 includes a first piston 204, which is sleeved outside the first cylinder 208. The first piston 204 is slidably connected to the first cylinder 208, and the first piston 204 is slidably connected to the inner wall of the sliding cylinder 227. A plurality of support rods 205 are fixedly connected to the top of the first piston 204, one end of the support rod 205 passes through the through hole 209 and is arranged outside the sliding cylinder 227, the top of the support rod 205 is fixedly connected to the first hinge block 206, and the bottom of the first hinge block 206 is fixedly connected to the sliding rod 210, the sliding rod 210 includes a rod body 211 and a third piston 212, the third piston 212 is fixedly connected to the bottom end of the rod body 211, one end of the rod body 211 and the third piston 212 both penetrate the sliding cylinder 227 and the top of the first cylinder 208 and are arranged in the first cylinder 208, the third piston 212 is slidably connected to the inner cavity of the first cylinder 208, and the third piston 212 is provided with a plurality of through grooves 213.

[0024] In the specific implementation process, Figures 1 to 11 As shown, the lifting mechanism 2 is composed of a first telescopic mechanism 201, a second telescopic mechanism 202 and a third telescopic mechanism 203, and these telescopic mechanisms are telescoped by the pressure change of hydraulic oil, thereby completing the lifting and lowering operation of the dump truck cargo box.

[0025] A damping mechanism 219 is designed in the third telescopic mechanism 203. When the lifting mechanism 2 loses pressure, the sliding cylinder 227 drives the first cylinder 208 to move downward, and the first cylinder 208 squeezes the hydraulic oil in the inner cavity of the second cylinder 220. When the hydraulic oil in the inner cavity of the second cylinder 220 is subjected to external force, the hydraulic oil can flow between the second cylinder 220 and the groove 221 through the flow hole 222. The diameter of the flow hole 222 is specially designed to be small, in order to increase the resistance of the hydraulic oil during the flow process. Thereby, an effective damping effect is formed. Since the volume of the tank body 221 is larger than the inner cavity of the second cylinder body 220, when the hydraulic oil flows from the second cylinder body 220 to the tank body 221 through the flow hole 222, the hydraulic oil compresses the air in the tank body 221. This compression process further increases the flow resistance of the hydraulic oil, thereby further improving the effective damping effect. This damping effect is particularly important when the hydraulic cylinder loses pressure. It can effectively slow down the descent speed of the cargo box and prevent the cargo box from colliding with the body of the dump truck.

[0026] When the first telescopic mechanism 201 loses pressure and moves downward, it will drive the sliding rod 210 to move downward. When the sliding rod 210 moves downward, the third piston 212 slides in the first cylinder 208. Since the third piston 212 has a plurality of through grooves 213, when the third piston 212 moves downward, the hydraulic oil in the first cylinder 208 flows through the through grooves 213. Since the diameter of the through grooves 213 is small, this increases the resistance of the hydraulic oil during the flow process, thereby playing a damping role. When the hydraulic cylinder loses pressure, the retraction speed of the first telescopic mechanism 201 can be effectively slowed down.

[0027] Embodiment 2: In Embodiment 1, there is still a problem that the lifting mechanism 2 fails or is disconnected, and the cargo box of the dump truck falls rapidly and collides with the dump truck itself, causing damage to both parties. Therefore, based on Embodiment 1, this embodiment also includes: The supporting mechanism 302 includes a pillar 307, which is fixedly connected to the base 301. The top of the pillar 307 is fixedly connected to an airbag 308, which is made of canvas. The top of the airbag 308 is fixedly connected to a rubber pad 309, which is used to protect the top of the airbag 308. One end of the air inlet pipe 304 passes through the side wall of the pillar 307 and is arranged in the pillar 307. The side wall of the pillar 307 is installed with an exhaust valve 303. A telescopic rod 310 is sleeved in the pillar 307. The bottom end of the telescopic rod 310 is fixedly connected to the top of the base 301, and the top end of the telescopic rod 310 is fixedly connected to the top of the inner cavity of the airbag 308.

[0028] The air pump 306 is electrically connected to a controller, in which a program is written to control the air pump 306 pumping air and the pumping time, in which a program is written to control the hydraulic oil input and extraction sleeve 214, in which a program is written to control the opening and closing of the exhaust valve 303, and in which a control panel is electrically connected to the controller, which is used to control various programs of the controller.

[0029] In the specific implementation process, Figure 1 , Fig. 9 , Fig.10 , Fig.11 and Fig.12 As shown, during normal use, the control panel is used to control the input and extraction of the hydraulic oil sleeve 214, thereby realizing the control of the lifting and lowering operations of the lifting mechanism 2 on the cargo box. When the lifting mechanism 2 is controlled by the control panel to lift the cargo box, the program controlling the air pump 306 to pump air synchronously controls the air pump 306 to start, and the program controlling the switch of the exhaust valve 303 synchronously closes the exhaust valve 303. The air pump 306 pumps air into the support 307, and the air bag 308 is inflated by the gas. The pumping time of the air pump 306 is controlled by the pumping time program to avoid the air bag 308 from bursting. After the air bag 308 is inflated, it is higher than the lifting mechanism 2 after being retracted. The degree of tension is high. When the lifting mechanism 2 is retracted by controlling the control panel, the program for controlling the switch of the exhaust valve 303 synchronously opens the exhaust valve 303, and the airbag 308 is deflated and restored to its original state. When the lifting mechanism 2 fails or is disconnected, and the cargo box of the dump truck falls rapidly, since the lifting mechanism 2 is not controlled by the control panel, the program for controlling the switch of the exhaust valve 303 will not open the exhaust valve 303, so the airbag 308 is in an expanded state. During the falling process of the cargo box, it first contacts the airbag 308. The airbag 308 provides a buffer for the cargo box and the dump truck, thereby reducing the damage caused by the collision between the cargo box and the dump truck.

[0030] Specifically, the working principle of the present invention is as follows: When in use, the device is installed on a dump truck, located on one side of the cargo box of the dump truck, between the cargo box and the driving compartment. The lifting mechanism 2 is composed of a first telescopic mechanism 201, a second telescopic mechanism 202 and a third telescopic mechanism 203. These telescopic mechanisms are telescoped and extended through the pressure change of the hydraulic oil, thereby completing the lifting and lowering operation of the cargo box of the dump truck.

[0031] When the lifting mechanism 2 loses pressure, the sliding cylinder 227 drives the first cylinder 208 to move downward, and the first cylinder 208 squeezes the hydraulic oil in the inner cavity of the second cylinder 220. When the hydraulic oil in the inner cavity of the second cylinder 220 is subjected to external force, the hydraulic oil can flow between the second cylinder 220 and the groove 221 through the flow hole 222. The diameter of the flow hole 222 is specially designed to be smaller. This is to increase the resistance of the hydraulic oil during the flow process, thereby forming an effective damping effect. Since the volume of the groove 221 is larger than the inner cavity of the second cylinder 220, when the hydraulic oil flows from the second cylinder 220 to the groove 221 through the flow hole 222, the hydraulic oil compresses the air in the groove 221. This compression process further increases the flow resistance of the hydraulic oil, thereby further improving the effective damping effect. This damping effect is particularly important when the hydraulic cylinder loses pressure. It can effectively slow down the descending speed of the cargo box and prevent the cargo box from colliding with the body of the dump truck.

[0032] When the first telescopic mechanism 201 loses pressure and moves downward, it will drive the sliding rod 210 to move downward. When the sliding rod 210 moves downward, the third piston 212 slides in the first cylinder 208. Since the third piston 212 has a plurality of through grooves 213, when the third piston 212 moves downward, the hydraulic oil in the first cylinder 208 flows through the through grooves 213. Since the diameter of the through grooves 213 is small, this increases the resistance of the hydraulic oil during the flow process, thereby playing a damping role. When the hydraulic cylinder loses pressure, the retraction speed of the first telescopic mechanism 201 can be effectively slowed down.

[0033] When the lifting mechanism 2 is controlled by the control panel to lift the cargo box, the program controlling the air pump 306 to pump air synchronously controls the air pump 306 to start, and the program controlling the exhaust valve 303 to switch synchronously closes the exhaust valve 303. The air pump 306 pumps air into the support 307, and the airbag 308 is expanded by the gas. The pumping time of the air pump 306 is controlled by the pumping time program to avoid the explosion of the airbag 308. After the airbag 308 is expanded, it is higher than the height of the lifting mechanism 2 after retraction. When the lifting mechanism 2 is retracted by the control panel, the exhaust valve 303 is controlled. The switch program synchronously performs the operation of opening the exhaust valve 303, and the airbag 308 is deflated and restored to its original state. When the lifting mechanism 2 fails or is disconnected, and the cargo box of the dump truck drops rapidly, since the lifting mechanism 2 is not controlled by the control panel, the program controlling the switch of the exhaust valve 303 will not run the operation of opening the exhaust valve 303, so the airbag 308 is in an inflated state. During the falling process of the cargo box, it first contacts the airbag 308. The airbag 308 acts as a buffer for the cargo box and the dump truck, thereby reducing the damage to both the cargo box and the dump truck caused by the collision.

[0034] In summary, the present invention solves the problem of rapid retraction of the dump truck's hydraulic cylinder due to pressure loss due to a fault, and avoids the problem of damage caused by collision between the cargo box and the dump truck itself.

[0035] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydraulic lifting device for a dump truck, comprising a cross bar (1), characterized in that: A lifting mechanism (2) is installed on the side wall of the crossbar (1), and the lifting mechanism (2) is used to lift the cargo box of the dump truck; The lifting mechanism (2) comprises a first telescopic mechanism (201), a second telescopic mechanism (202) and a third telescopic mechanism (203); the third telescopic mechanism (203) comprises a second hinge block (217); the second hinge block (217) is sleeved outside the cross bar (1); the second hinge block (217) is rotatably connected to the cross bar (1); the top of the second hinge block (217) is fixedly connected to a sleeve (214); a damping mechanism (219) is sleeved inside the sleeve (214); the damping mechanism (219) is fixedly connected to the top of the second hinge block (217); The damping mechanism (219) comprises a second cylinder (220), the second cylinder (220) is provided with a groove (221), a plurality of flow holes (222) are provided on the inner cavity side wall of the second cylinder (220), the inner cavity of the second cylinder (220) is connected to the groove (221) through the flow holes (222), the volume of the groove (221) is larger than the inner cavity of the second cylinder (220), the inner cavity of the second cylinder (220) is filled with hydraulic oil, and a cylinder cover (223) is provided on the top of the second cylinder (220), and the cylinder cover (223) is threadedly connected to the second cylinder (220); The second telescopic mechanism (202) comprises a sliding cylinder (227), a plurality of through holes (209) are formed on the top of the sliding cylinder (227), a fourth piston (226) is fixedly connected to the bottom of the sliding cylinder (227), the sliding cylinder (227) and the fourth piston (226) are both sleeved in the sleeve (214), the fourth piston (226) is slidably connected to the inner cavity of the sleeve (214), and a plurality of infusion holes are formed on the bottom of the sliding cylinder (227). The top of the inner cavity of the sliding cylinder (227) is fixedly connected to the first cylinder (208), the first cylinder (208) is filled with hydraulic oil, the bottom of the first cylinder (208) is fixedly connected to the second piston (207), one end of the first cylinder (208) and the second piston (207) are both inserted through the cylinder cover (223) and are sleeved in the second cylinder (220), and the second piston (207) is slidably connected to the inner cavity of the second cylinder (220); The first telescopic mechanism (201) comprises a first piston (204), the first piston (204) being sleeved outside a first cylinder (208), the first piston (204) being slidably connected to the first cylinder (208), the first piston (204) being slidably connected to the inner wall of a sliding cylinder (227), a plurality of support rods (205) being fixedly connected to the top of the first piston (204), one end of the support rod (205) passing through a through hole (209) and being arranged outside the sliding cylinder (227), the top of the support rod (205) being fixedly connected to a first hinge block (206), A sliding rod (210) is fixedly connected to the bottom of the first hinge block (206), and the sliding rod (210) includes a rod body (211) and a third piston (212). The third piston (212) is fixedly connected to the bottom end of the rod body (211). One end of the rod body (211) and the third piston (212) both penetrate the sliding cylinder (227) and the top of the first cylinder (208) and are arranged in the first cylinder (208). The third piston (212) is slidably connected to the inner cavity of the first cylinder (208), and the third piston (212) is provided with a plurality of through grooves (213).

2. A hydraulic lifting device for a dump truck according to claim 1, characterized in that: Buffer mechanisms (3) are installed at both ends of the cross bar (1), and the buffer mechanism (3) comprises a base (301), the base (301) is fixedly connected to the cross bar (1), an air pump (306) is installed in the base (301), an air outlet of the air pump (306) is fixedly connected to an air inlet pipe (304), one end of the air inlet pipe (304) passes through a side wall of the base (301) and is arranged outside the base (301), a one-way air valve (305) is installed in the air inlet pipe (304), and the top of the base (301) is fixedly connected to a support mechanism (302).

3. A hydraulic lifting device for a dump truck according to claim 2, characterized in that: The support mechanism (302) comprises a pillar (307), the pillar (307) being fixedly connected to the base (301), an air bag (308) being fixedly connected to the top of the pillar (307), one end of the air intake pipe (304) penetrating through a side wall of the pillar (307) and being arranged inside the pillar (307), and an exhaust valve (303) being installed on the side wall of the pillar (307).

4. A hydraulic lifting device for a dump truck according to claim 3, characterized in that: A telescopic rod (310) is sleeved inside the pillar (307), the bottom end of the telescopic rod (310) is fixedly connected to the top of the base (301), and the top end of the telescopic rod (310) is fixedly connected to the top of the inner cavity of the airbag (308).

5. The hydraulic lifting device for a dump truck according to claim 3, characterized in that: A rubber pad (309) is fixedly connected to the top of the airbag (308), and the rubber pad (309) is used to protect the top of the airbag (308).

6. The hydraulic lifting device for a dump truck according to claim 3, characterized in that: The air pump (306) is electrically connected to a controller, the controller having a program for controlling the air pump (306) to pump air and the pumping time, the controller having a program for controlling the hydraulic oil input and extraction of the sleeve (214), the controller having a program for controlling the opening and closing of the exhaust valve (303), and the controller being electrically connected to a control panel, the control panel being used to control various programs of the controller.

7. The hydraulic lifting device for a dump truck according to claim 3, characterized in that: The material of the airbag (308) is canvas.

8. The hydraulic lifting device for a dump truck according to claim 1, characterized in that: The top of the sleeve (214) is covered with a cylinder cover (216), and the cylinder cover (216) is threadedly connected to the sleeve (214).

9. The hydraulic lifting device for a dump truck according to claim 8, characterized in that: The sleeve (214) is provided with a flange (215) on its outer shell, the flange (215) is fixedly connected to the sleeve (214), the flange (215) and the cylinder head (216) are both provided with a plurality of threaded holes, bolts are sleeved in the threaded holes, and the cylinder head (216) and the flange (215) are fixedly connected by bolts.

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