A front-mounted hydraulic lifting device for a heavy truck dump truck

Abstract

The present application relates to the technical fields of hydraulic lifting of dump truck, in particular to a front hydraulic lifting device of heavy-duty dump truck. The device comprises two groups of frames and a carriage. One end of each frame is fixedly connected with a front fixed plate. A first lifting bracket is arranged on the front fixed plate. A lifting hydraulic cylinder is rotatably connected to the first lifting bracket. An oil tank is arranged on the front fixed plate. An oil pipe is in communication between the oil tank and the lifting hydraulic cylinder. A second lifting bracket is fixedly connected to the carriage. The oil in the oil tank is pressurized and then enters the lifting hydraulic cylinder, so that the end of the telescopic connecting rod drives the sleeve to rise. The first hinged seat at the bottom of the carriage drives the end of the two groups of supporting shafts to rise, pulls the supporting assembly, and is engaged with the rack through the limiting mechanism, so that the two groups of supporting shafts produce auxiliary support to the carriage during the movement of the supporting assembly, effectively reducing the stress of the telescopic connecting rod and effectively improving the stability of the carriage lifting.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic lifting technology for dump trucks, and specifically relates to a front-mounted hydraulic lifting device for heavy-duty dump trucks. Background Technology

[0002] Specialized dump trucks are equipped with hydraulic lifting mechanisms that allow the cargo box to be lowered or tilted at a certain angle, enabling the cargo to be unloaded by its own weight or by horizontal pushing. Dump trucks primarily transport bulk goods such as sand, stone, soil, garbage, building materials, coal, ore, grain, fertilizer, and agricultural products. The hydraulic lifting mechanism plays a crucial role in maintaining unloading efficiency and reducing the burden on personnel and resources. Heavy-duty dump trucks, due to their large load capacity, generally use front-mounted hydraulic lifting devices for unloading. However, during the lifting process, the thin end of the telescopic connecting rod inside the lifting cylinder often leads to slow and laborious lifting of the cargo box. Furthermore, the cargo box may fall back down after being lifted, damaging the device and affecting its lifting stability and lifespan.

[0003] According to the prior art, patent application number CN201310019549.0, application date: 2013-01-21, discloses a front-mounted hydraulic lifting device for heavy-duty dump trucks. The device is characterized by: a pneumatic power take-off (PTO) with an additional end cover (12). The end cover is fixedly connected to the end of the clutch shaft cylinder of the PTO housing by bolts. The middle part of the end cover is fixedly connected to the air inlet (13). The end face of the clutch shaft is a flat or arc-shaped surface. The clutch shaft cylinder wall of the clutch housing is provided with an O-ring groove that fits into the O-ring. The control valve is provided with a valve end cover (21). The middle part of the valve end cover is fixedly connected to the air nozzle (13). The front end of the piston (22) and the valve end cover are in an air chamber. The connection between the piston and the valve core (23) is designed as a T-shaped groove, which is connected to the T-shaped boss at the end of the valve core with clearance. The lower part of the hydraulic cylinder is fixedly installed in the middle of the front frame, and the upper part is installed in the center of the front of the truck body.

[0004] However, the device still has the following drawbacks: Although the processing technology is simple and the processing requirements are low, and it can solve problems such as welding difficulties in the manufacturing process, the device is not equipped with a lifting auxiliary support device and a self-locking function. This can easily lead to slow and laborious lifting of the carriage, and the carriage may fall on its own after being lifted, causing damage to the device and affecting its lifting stability and service life. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a front-mounted hydraulic lifting device for heavy-duty dump trucks, comprising two sets of frames and a truck body. A front fixing plate is fixedly connected to one end of each of the two sets of frames. A first lifting bracket is mounted on the front fixing plate, and a lifting hydraulic cylinder is rotatably connected to the first lifting bracket. An oil tank is mounted on the front fixing plate, and an oil pipe connects the oil tank to the lifting hydraulic cylinder. A second lifting bracket is fixedly connected to the truck body, and a sleeve is rotatably connected to the second lifting bracket. The sleeve is movably engaged with the lifting hydraulic cylinder. A telescopic connecting rod is driven to the output end of the lifting hydraulic cylinder, and the end of the telescopic connecting rod is hinged to the top of the inner wall of the sleeve.

[0006] A crossbeam is fixedly connected between the two sets of vehicle frames. Two sets of limiting shafts are fixedly connected between the crossbeam and the front fixed plate. Support components are slidably connected to the two sets of limiting shafts. Two sets of support shafts are hinged to the support components. Two sets of first hinge seats are fixedly connected to the bottom of the vehicle body. The two sets of first hinge seats are respectively hinged to the ends of the two sets of support shafts.

[0007] Furthermore, a rear fixing plate is fixedly connected to one end of each of the two sets of vehicle frames, and two sets of hinge blocks are fixedly connected to the bottom of the vehicle body. Two sets of second hinge seats are fixedly connected to the rear fixing plate, and the two sets of second hinge seats are respectively hinged to the two sets of hinge blocks.

[0008] Furthermore, buffer blocks are slidably connected to the two sets of limiting shafts. The two ends of the buffer blocks are movably fitted to the inner sidewalls of the two sets of frames, and the buffer blocks are movably in contact with the support components. Two sets of first springs are provided between the buffer blocks and the front fixed plate, and the two sets of first springs are respectively sleeved on the two sets of limiting shafts.

[0009] Furthermore, the support assembly includes a slider, the two ends of which are movably fitted to the inner sidewalls of the two sets of frames, the slider having two sets of through holes that are movably fitted to the two sets of limiting shafts, the slider having two sets of third hinge seats fixedly connected to it, the two sets of third hinge seats being hinged to the ends of the two sets of support shafts, the slider having limiting mechanisms at both ends, the two sets of frames having first limiting grooves, the bottom of the inner walls of the two sets of first limiting grooves being provided with racks, the racks being meshed with the two sets of limiting mechanisms.

[0010] Furthermore, a second limiting groove is provided on one end of both sets of vehicle frames near the front fixed plate. The second limiting groove is connected to the first limiting groove. A limiting frame is rotatably connected to the inner wall of the second limiting groove. A rotating shaft is fixedly connected to the corner of the limiting frame. The two ends of the rotating shaft are respectively rotatably connected to the inner walls of the two sides of the second limiting groove. A number of sets of locking teeth are provided on one end of the limiting frame. The number of sets of locking teeth are movably engaged with the limiting mechanism. A telescopic rod is provided on the other end of the limiting frame.

[0011] Furthermore, a pressing rod is hinged to the end of the telescopic rod, and a pressing block is fixedly connected to the end of the pressing rod. The pressing block moves in contact with the limiting mechanism. A second spring is provided between the pressing block and the side wall of the first limiting groove. The second spring is sleeved on the pressing rod, and a groove is provided on the pressing rod at the end away from the pressing block.

[0012] Furthermore, the frame is provided with a first sliding groove and a second sliding groove, which are interconnected. The first sliding groove is also interconnected with a second limiting groove. A latch is provided in the first sliding groove, extending into the second limiting groove. The latch is movably engaged with the groove. A sliding rod is fixedly connected to the bottom end of the latch. A third spring is provided between the latch and the bottom end of the first sliding groove. The third spring is sleeved on the sliding rod. The sliding rod is movably fitted with the second sliding groove. The sliding rod passes through the second sliding groove, and the bottom end of the sliding rod extends to the bottom end of the outer wall of the frame. A pull ring is fixedly connected to the bottom end of the sliding rod.

[0013] Furthermore, the limiting mechanism includes a fixed shaft, on which a rotating part is rotatably connected. The end of the fixed shaft passes through the central axis of the rotating part, and a cross groove is provided at the end of the fixed shaft. A thread is provided on the fixed shaft, and a locking part is movably engaged at the end of the fixed shaft. A locking bolt is threadedly connected to the end of the fixed shaft.

[0014] Furthermore, the rotating part includes a limiting block, which is rotatably connected to a fixed shaft. A gear column is fixedly connected to the limiting block, and the center line of the gear column is rotatably connected to the fixed shaft. The gear column has several sets of locking holes, which are arranged in a circular array around the central axis of the gear column.

[0015] Furthermore, the locking part includes a chassis, a snap-fit ​​hole is provided at the center of the chassis, the snap-fit ​​hole is movably snapped with the end of the fixed shaft, a cross is provided on the inner wall of the snap-fit ​​hole, the cross is movably snapped with the cross groove, and several sets of locking pins are fixedly connected to the chassis, and the several sets of locking pins are movably snapped with several sets of locking holes respectively.

[0016] The beneficial effects of this invention are:

[0017] 1. By pressurizing the oil in the tank and sending it into the lifting hydraulic cylinder, the end of the telescopic connecting rod drives the sleeve to rise, thus lifting the truck bed. During the lifting process, the first hinge seat connected to the bottom of the truck bed drives the ends of the two sets of support shafts to rise, pulling the support assembly. The support assembly slides on the two sets of limit shafts and is connected to the rack and pinion through the limit mechanism. During the movement of the support assembly, the two sets of support shafts provide auxiliary support to the truck bed, effectively reducing the stress on the telescopic connecting rod and effectively improving the stability of the truck bed lifting.

[0018] 2. During the lifting process of the car body, the support component moves horizontally and contacts the buffer block, pushing the buffer block to continue moving. This causes the first spring to exert a resisting force on the buffer block, slowing down the lifting speed when the car body is lifted to a high position. This prevents cylinder pull-out when the telescopic link is lifted to its highest point, or sudden stop of lifting due to excessive lifting speed, which could cause the telescopic link to break. This effectively extends the service life of the lifting device.

[0019] 3. When the carriage is raised to the preset highest point, the limiting mechanism contacts the squeezing block and pushes the squeezing block, causing the squeezing rod to rotate the limiting frame, making the locking teeth engage with the gear column. At the same time, the squeezing rod squeezes the bolt, causing the bolt to be locked into the groove due to the resistance of the third spring. This locks the squeezing rod and the limiting frame, and also creates a self-locking effect on the limiting mechanism, so that the support shaft provides stable support to the bottom of the carriage. This effectively prevents accidents caused by the cylinder falling automatically during unloading. When the carriage needs to be lowered, pulling the pull ring causes the sliding rod to lower the bolt and disengage it from the groove, thus releasing the self-locking function of the device. The self-locking function of the device effectively avoids accidents during unloading and improves the safety of the lifting device.

[0020] 4. By attaching the locking part to the rotating part, inserting the locking pin into the corresponding locking hole, and inserting the cross into the cross groove, the locking bolt is attached to the end of the fixed shaft and tightened, preventing the rotating part from rotating. Through the meshing of the gear column and rack, the limiting mechanism drives the slider to be fixed on the frame, so that the support shaft provides stable support for the car body. When a malfunction occurs during the lifting of the car body and it suddenly stops and needs maintenance, the car body at any height can be fixedly supported, improving the convenience and safety of the device maintenance.

[0021] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the main structure according to an embodiment of the present invention is shown;

[0024] Figure 2 A schematic diagram of the carriage lifting state structure according to an embodiment of the present invention is shown;

[0025] Figure 3 A schematic diagram of the frame structure according to an embodiment of the present invention is shown;

[0026] Figure 4 A schematic diagram of the support component structure according to an embodiment of the present invention is shown;

[0027] Figure 5 An embodiment of the present invention is shown. Figure 3 Enlarged view of point A in the middle;

[0028] Figure 6 A cross-sectional view of a portion of the vehicle frame structure according to an embodiment of the present invention is shown;

[0029] Figure 7 A schematic diagram of the limiting mechanism structure according to an embodiment of the present invention is shown;

[0030] Figure 8 A schematic diagram of the rotating part structure according to an embodiment of the present invention is shown;

[0031] Figure 9 A schematic diagram of the locking part structure according to an embodiment of the present invention is shown.

[0032] In the diagram: 1. Frame; 2. Front mounting plate; 3. Rear mounting plate; 4. First lifting bracket; 5. Lifting hydraulic cylinder; 6. Oil tank; 7. Oil pipe; 8. Cargo box; 9. Second lifting bracket; 10. Sleeve; 11. Telescopic link; 12. Crossbeam; 13. Limiting shaft; 14. Support assembly; 141. Slider; 142. Through hole; 143. Third hinge seat; 144. Limiting mechanism; 1441. Fixed shaft; 1442. Rotating part; 14421. Limiting block; 14422. Gear column; 14423. Locking hole; 1443. Cross groove; 1444. Locking part; 14441. Chassis; 1444 2. Snap-fit ​​hole; 14443. Cross; 14444. Locking pin; 1445. Locking bolt; 15. Support shaft; 16. First hinge seat; 17. Hinge block; 18. Second hinge seat; 19. Buffer block; 20. First spring; 21. First limiting groove; 22. Rack; 23. Second limiting groove; 24. Limiting frame; 241. Rotating shaft; 242. Locking tooth; 243. Telescopic rod; 25. Pressing rod; 251. Pressing block; 252. Second spring; 253. Groove; 26. First slide groove; 27. Second slide groove; 28. Locking bolt; 281. Slide rod; 282. Third spring; 283. Pull ring. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This invention provides a front-mounted hydraulic lifting device for a heavy-duty dump truck, comprising two sets of frames 1 and a truck body 8; exemplarily, such as... Figure 1-3 As shown.

[0035] Two sets of vehicle frames 1 are fixedly connected to a front fixing plate 2 at one end and to a rear fixing plate 3 at the other end. A first lifting bracket 4 is provided on the front fixing plate 2. A lifting hydraulic cylinder 5 is rotatably connected to the first lifting bracket 4. An oil tank 6 is provided on the front fixing plate 2. An oil pipe 7 connects the oil tank 6 and the lifting hydraulic cylinder 5. A second lifting bracket 9 is fixedly connected to the vehicle body 8. A sleeve 10 is rotatably connected to the second lifting bracket 9. The sleeve 10 is movably engaged with the lifting hydraulic cylinder 5. A telescopic connecting rod 11 is drivenly connected to the output end of the lifting hydraulic cylinder 5. The end of the telescopic connecting rod 11 is hinged to the top of the inner wall of the sleeve 10.

[0036] A crossbeam 12 is fixedly connected between the two sets of vehicle frames 1. The crossbeam 12 is in contact with the rear fixed plate 3. Two sets of limiting shafts 13 are fixedly connected between the crossbeam 12 and the front fixed plate 2. Support components 14 are slidably connected to the two sets of limiting shafts 13. The two ends of the support components 14 are respectively in contact with the inner sidewalls of the two sets of vehicle frames 1. Two sets of support shafts 15 are hinged to the support components 14. Two sets of first hinge seats 16 are fixedly connected to the bottom of the vehicle body 8. The two sets of first hinge seats 16 are respectively hinged to the ends of the two sets of support shafts 15. Two sets of hinge blocks 17 are fixedly connected to the bottom of the vehicle body 8. Two sets of second hinge seats 18 are fixedly connected to the rear fixed plate 3. The two sets of second hinge seats 18 are respectively hinged to the two sets of hinge blocks 17.

[0037] Two sets of limiting shafts 13 are slidably connected with buffer blocks 19. The two ends of the buffer blocks 19 are respectively in contact with the inner sidewalls of the two sets of frames 1. The buffer blocks 19 are in contact with the support components 14. Two sets of first springs 20 are provided between the buffer blocks 19 and the front fixing plate 2. The two sets of first springs 20 are respectively sleeved on the two sets of limiting shafts 13.

[0038] The support component 14 includes a slider 141; for example, such as Figure 4 As shown.

[0039] The two ends of the slider 141 are respectively movably fitted to the inner sidewalls of the two sets of frames 1. The slider 141 is provided with two sets of through holes 142, which are respectively movably fitted to two sets of limiting shafts 13. Two sets of third hinge seats 143 are fixedly connected to the slider 141, and the two sets of third hinge seats 143 are respectively hinged to the ends of the two sets of support shafts 15. Both ends of the slider 141 are provided with limiting mechanisms 144.

[0040] For example, such as Figure 5 and Figure 6 As shown.

[0041] Both sets of vehicle frames 1 are provided with a first limiting groove 21. A rack 22 is laid at the bottom of the inner wall of each set of first limiting grooves 21. The racks 22 are respectively engaged with two sets of limiting mechanisms 144. A second limiting groove 23 is provided on one end of each set of vehicle frames 1 near the front fixing plate 2. The second limiting groove 23 communicates with the first limiting groove 21. A limiting frame 24 is rotatably connected to the inner wall of the second limiting groove 23. A rotating shaft 241 is fixedly connected to the corner of the limiting frame 24. The two ends of the rotating shaft 241 are rotatably connected to the inner walls of the two sides of the second limiting groove 23, respectively. One end of the limiting frame 24 is provided with several sets of locking teeth 242, which are movably engaged with the limiting mechanism 144. The other end of the limiting frame 24 is provided with a telescopic rod 243, and a pressing rod 25 is hinged to the end of the telescopic rod 243. A pressing block 251 is fixedly connected to the end of the pressing rod 25, and the pressing block 251 movably abuts against the limiting mechanism 144. A second spring 252 is provided between the first limiting groove 21 and the side wall. The second spring 252 is sleeved on the extrusion rod 25. A groove 253 is provided on the extrusion rod 25 at one end away from the extrusion block 251. A first sliding groove 26 and a second sliding groove 27 are provided on the frame 1. The first sliding groove 26 and the second sliding groove 27 are interconnected. The first sliding groove 26 is interconnected with the second limiting groove 23. A latch 28 is provided in the first sliding groove 26 and extends to the second limiting groove. Inside 23, the bolt 28 is movably engaged with the groove 253. The bottom end of the bolt 28 is fixedly connected to a slide rod 281. A third spring 282 is provided between the bolt 28 and the bottom end of the first slide groove 26. The third spring 282 is sleeved on the slide rod 281. The slide rod 281 is movably fitted with the second slide groove 27. The slide rod 281 passes through the second slide groove 27, and the bottom end of the slide rod 281 extends to the bottom end of the outer wall of the frame 1. A pull ring 283 is fixedly connected to the bottom end of the slide rod 281.

[0042] The limiting mechanism 144 includes a fixed shaft 1441; for example, such as Figure 6-9 As shown.

[0043] A rotating part 1442 is rotatably connected to the fixed shaft 1441. The end of the fixed shaft 1441 passes through the central axis of the rotating part 1442. A cross groove 1443 is provided at the end of the fixed shaft 1441. A thread is provided on the fixed shaft 1441. A locking part 1444 is movably engaged at the end of the fixed shaft 1441. A locking bolt 1445 is threadedly connected to the end of the fixed shaft 1441.

[0044] The rotating part 1442 includes a limiting block 14421, which is rotatably connected to the fixed shaft 1441. A gear column 14422 is fixedly connected to the limiting block 14421. The center line of the gear column 14422 is rotatably connected to the fixed shaft 1441. The gear column 14422 has several sets of locking holes 14423, which are arranged in a circular array around the central axis of the gear column 14422.

[0045] The locking part 1444 includes a chassis 14441. A snap-fit ​​hole 14442 is provided at the center of the chassis 14441. The snap-fit ​​hole 14442 is movably snapped with the end of the fixed shaft 1441. A cross 14443 is provided on the inner wall of the snap-fit ​​hole 14442. The cross 14443 is movably snapped with the cross groove 1443. Several sets of locking pins 14444 are fixedly connected to the chassis 14441. The several sets of locking pins 14444 are respectively movably snapped with several sets of locking holes 14423.

[0046] The working principle of the front-mounted hydraulic lifting device for heavy-duty dump trucks proposed in this invention is as follows:

[0047] When the carriage 8 needs to be lifted, the oil in the oil tank 6 is pressurized and enters the lifting hydraulic cylinder 5, causing the end of the telescopic link 11 to drive the sleeve 10 to rise, thus lifting the carriage 8. During the lifting process, the first hinge seat 16 connected to the bottom of the carriage 8 drives the ends of the two sets of support shafts 15 to rise, pulling the support assembly 14, causing the support assembly 14 to slide on the two sets of limit shafts 13. Through the limit mechanism 144, it is engaged with the rack 22, so that during the movement of the support assembly 14, the two sets of support shafts 15 provide auxiliary support for the carriage 8, effectively reducing the force on the telescopic link 11 and improving the stability of the carriage 8 during lifting.

[0048] During the lifting process of the carriage 8, the support component 14 moves horizontally and comes into contact with the buffer block 19, and pushes the buffer block 19 to continue moving, so that the first spring 20 generates a resisting force on the buffer block 19, which slows down the rising speed when the carriage 8 is lifted to a high position, effectively preventing the telescopic link 11 from suddenly stopping rising when the lifting speed is too fast when it is lifted to the highest point, causing the telescopic link to break.

[0049] When the carriage 8 is raised to the preset highest point, the limiting mechanism 144 contacts the squeezing block 251 and pushes the squeezing block 251 to make the squeezing rod 25 drive the limiting frame 24 to rotate, so that the locking teeth 242 engage with the gear column 14422. At the same time, the squeezing rod 25 squeezes the bolt 28, so that the bolt 28 is locked into the groove 253 due to the resistance of the third spring 282, thus locking and limiting the squeezing rod 25 and the limiting frame 24. At the same time, the limiting mechanism 144 has a self-locking effect, fixing the end of the support shaft 15 and providing stable support for the bottom of the carriage 8, effectively preventing the lifting hydraulic cylinder 5 from falling automatically during the unloading process and causing an accident. When the carriage 8 needs to be lowered, by pulling the pull ring 283, the sliding rod 281 drives the bolt 28 to descend and disengage from the groove 253, thus releasing the self-locking of the device.

[0050] When the lifting hydraulic cylinder 5 malfunctions and suddenly stops during the lifting process, requiring maintenance, the locking part 1444 is engaged with the rotating part 1442, the locking pin 14444 is inserted into the corresponding locking hole 14423, the cross 14443 is engaged in the cross groove 1443, the locking bolt 1445 is engaged with the end of the fixed shaft 1441 and tightened, so that the rotating part 1442 cannot rotate. Through the meshing of the gear column 14422 and the rack 22, the limiting mechanism 144 drives the slider 141 to be fixed on the frame 1, so that the support shaft 15 provides stable support for the carriage 8, which facilitates the maintenance of the lifting device.

[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A front-mounted hydraulic lifting device for a heavy-duty dump truck, comprising two sets of frames (1) and a cargo box (8), characterized in that: Two sets of vehicle frames (1) are fixedly connected to a front fixed plate (2) at one end. A first lifting bracket (4) is provided on the front fixed plate (2). A lifting hydraulic cylinder (5) is rotatably connected on the first lifting bracket (4). An oil tank (6) is provided on the front fixed plate (2). An oil pipe (7) is connected between the oil tank (6) and the lifting hydraulic cylinder (5). A second lifting bracket (9) is fixedly connected on the vehicle body (8). A sleeve (10) is rotatably connected on the second lifting bracket (9). The sleeve (10) is movably engaged with the lifting hydraulic cylinder (5). A telescopic connecting rod (11) is drivenly connected to the output end of the lifting hydraulic cylinder (5). The end of the telescopic connecting rod (11) is hinged to the top of the inner wall of the sleeve (10). A crossbeam (12) is fixedly connected between the two sets of the frame (1), and two sets of limiting shafts (13) are fixedly connected between the crossbeam (12) and the front fixed plate (2). Support components (14) are slidably connected to the two sets of limiting shafts (13), and two sets of support shafts (15) are hinged to the support components (14). Two sets of first hinge seats (16) are fixedly connected to the bottom of the carriage (8), and the two sets of first hinge seats (16) are respectively hinged to the ends of the two sets of support shafts (15). The support component (14) includes a slider (141), and both ends of the slider (141) are provided with limit mechanisms (144). The limiting mechanism (144) includes a fixed shaft (1441), a rotating part (1442) rotatably connected to the fixed shaft (1441), an end of the fixed shaft (1441) passing through the central axis of the rotating part (1442), and a cross groove (1443) provided at the end of the fixed shaft (1441). A locking part (1444) is movably engaged at the end of the fixed shaft (1441). A locking bolt (1445) is threadedly connected to the end of the fixed shaft (1441). The locking part (1444) includes a chassis (14441), and a snap-fit ​​hole (14442) is provided at the center of the chassis (14441). The snap-fit ​​hole (14442) is movably snapped with the end of the fixed shaft (1441). A cross (14443) is provided on the inner wall of the snap-fit ​​hole (14442). The cross (14443) is movably snapped with the cross groove (1443). Several sets of locking pins (14444) are fixedly connected to the chassis (14441). The several sets of locking pins (14444) are movably snapped with several sets of locking holes (14423).

2. The front-mounted hydraulic lifting device for heavy-duty dump trucks according to claim 1, characterized in that: Two sets of vehicle frames (1) are fixedly connected to a rear fixing plate (3) at one end, and two sets of hinge blocks (17) are fixedly connected to the bottom of the vehicle body (8). Two sets of second hinge seats (18) are fixedly connected to the rear fixing plate (3), and the two sets of second hinge seats (18) are respectively hinged to the two sets of hinge blocks (17).

3. The front-mounted hydraulic lifting device for heavy-duty dump trucks according to claim 1, characterized in that: Two sets of limiting shafts (13) are slidably connected with buffer blocks (19). The two ends of the buffer blocks (19) are respectively in contact with the inner sidewalls of the two sets of frames (1). The buffer blocks (19) are in contact with the support components (14). Two sets of first springs (20) are provided between the buffer blocks (19) and the front fixing plate (2). The two sets of first springs (20) are respectively sleeved on the two sets of limiting shafts (13).

4. The front-mounted hydraulic lifting device for heavy-duty dump trucks according to claim 1, characterized in that: The two ends of the slider (141) are movably fitted to the inner sidewalls of the two sets of frames (1). The slider (141) has two sets of through holes (142), which are movably fitted to the two sets of limiting shafts (13). The slider (141) is fixedly connected to two sets of third hinge seats (143), which are hinged to the ends of the two sets of support shafts (15). The two sets of frames (1) are each provided with a first limiting groove (21). The bottom of the inner wall of the two sets of first limiting grooves (21) is provided with a rack (22), which is meshed with the two sets of limiting mechanisms (144).

5. The front-mounted hydraulic lifting device for heavy-duty dump trucks according to claim 4, characterized in that: Both sets of the frame (1) are provided with a second limiting groove (23) at one end near the front fixed plate (2). The second limiting groove (23) is connected to the first limiting groove (21). The inner wall of the second limiting groove (23) is rotatably connected to a limiting frame (24). A rotating shaft (241) is fixedly connected at the corner of the limiting frame (24). The two ends of the rotating shaft (241) are respectively rotatably connected to the inner walls of the two sides of the second limiting groove (23). One end of the limiting frame (24) is provided with several sets of locking teeth (242). The several sets of locking teeth (242) are movably engaged with the limiting mechanism (144). The other end of the limiting frame (24) is provided with a telescopic rod (243).

6. The front-mounted hydraulic lifting device for heavy-duty dump trucks according to claim 5, characterized in that: The end of the telescopic rod (243) is hinged to a pressing rod (25), and the end of the pressing rod (25) is fixedly connected to a pressing block (251). The pressing block (251) is in contact with the limiting mechanism (144). A second spring (252) is provided between the pressing block (251) and the side wall of the first limiting groove (21). The second spring (252) is sleeved on the pressing rod (25), and a groove (253) is provided on the pressing rod (25) at one end away from the pressing block (251).

7. The front-mounted hydraulic lifting device for heavy-duty dump trucks according to claim 5, characterized in that: The frame (1) has a first sliding groove (26) and a second sliding groove (27), which are interconnected. The first sliding groove (26) is also interconnected with a second limiting groove (23). A latch (28) is provided in the first sliding groove (26), which extends into the second limiting groove (23). The latch (28) is movably engaged with the groove (253), and the bottom end of the latch (28) is fixedly connected to a sliding groove. A third spring (282) is provided between the rod (281), the bolt (28) and the bottom end of the first slide groove (26). The third spring (282) is sleeved on the slide rod (281). The slide rod (281) is movably fitted with the second slide groove (27). The slide rod (281) passes through the second slide groove (27), and the bottom end of the slide rod (281) extends to the bottom end of the outer wall of the frame (1). A pull ring (283) is fixedly connected to the bottom end of the slide rod (281).

8. The front-mounted hydraulic lifting device for heavy-duty dump trucks according to claim 4, characterized in that: The fixed shaft (1441) is threaded.

9. The front-mounted hydraulic lifting device for heavy-duty dump trucks according to claim 8, characterized in that: The rotating part (1442) includes a limiting block (14421), which is rotatably connected to the fixed shaft (1441). A gear column (14422) is fixedly connected to the limiting block (14421). The center line of the gear column (14422) is rotatably connected to the fixed shaft (1441). The gear column (14422) is provided with a number of locking holes (14423), which are arranged in a circular array with the central axis of the gear column (14422) as the center.

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