A tipping truck lifting device

Abstract

The present invention provides a tipping device for a dump truck, which relates to the technical field of vehicle lifting devices and includes a hydraulic lifting cylinder. A circle of insertion plates are commonly installed through the tail end parts of the retaining ring and the bushing in a sliding manner, and the head end parts of the circle of insertion plates are inserted and matched with the annular positioning grooves; A driving ring is slidably sleeved on the part of the bushing between the retaining ring and the limiting ring, and connecting rods are rotatably connected between the driving ring and the circle of insertion plates; An inclined positioning shaft is welded on the outer periphery of the limiting ring, and an L-shaped driving rod that is positioned by spring pushing is slidably installed on the inclined positioning shaft; The axle pin and the axle pin sleeve are rotatably matched through. During the maintenance process, the two L-shaped driving rods can utilize the up and down pushing of the hydraulic lifting cylinder on the two second auxiliary struts and the telescopic driving force of the carriage to slide up and down and drive the two circles of insertion plates to synchronously insert and extract inside and outside to lock and unlock the axle pin, which can save the trouble of manually operating the two L-shaped driving rods to lock and unlock the axle pin additionally.

Description

Technical Field

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

[0002] In the current application scenarios of dump trucks, common lifting devices mostly adopt hydraulic drive methods.

[0003] For the shaft pins used on existing lifting devices to connect the telescopic rod of the hydraulic lifting cylinder and the auxiliary support rod, snap rings are mostly used for positioning. Although the snap ring has a simple structure, when disassembling and assembling it with the shaft pin, an external expansion tool needs to be used to expand it, which is rather troublesome and inconvenient to operate, and is not conducive to improving the disassembly and assembly efficiency of the hydraulic lifting cylinder during maintenance;

[0004] In addition, although some lifting devices are equipped with a convenient disassembly and assembly positioning mechanism for the shaft pin, when loosening and tightening the shaft pin for disassembly and assembly, manual operation is still required, and the use is still rather troublesome and inconvenient. Summary of the Invention

[0005] In view of this, the present invention provides a lifting device for a dump truck to solve the problem of low disassembly and assembly efficiency of the hydraulic lifting cylinder during maintenance.

[0006] The technical solution proposed by the present invention is: a lifting device for a dump truck, which is arranged between the carriage and the vehicle chassis, and specifically includes a hydraulic lifting cylinder, two first auxiliary support rods and two second auxiliary support rods. A shaft pin sleeve is welded to the head end of the telescopic rod of the hydraulic lifting cylinder, and the head ends of the two first auxiliary support rods are correspondingly rotatably connected to the tail ends of the two second auxiliary support rods;

[0007] Two shaft sleeves that support each other are welded on the half section near the tail end of the two second auxiliary support rods. A shaft pin is inserted through the two second auxiliary support rods and the two shaft sleeves together. Two annular positioning grooves are symmetrically arranged at both ends of the shaft pin; a limiting ring is welded to the head end part of the shaft sleeve, and a retaining ring is welded and sleeved in the peripheral space of the tail end part of the shaft sleeve. A circle of insertion plates is slidably installed through the retaining ring and the tail end part of the shaft sleeve together. The head end parts of the circle of insertion plates are inserted and matched with the annular positioning grooves; a driving ring is slidably sleeved on the part of the shaft sleeve between the retaining ring and the limiting ring, and a connecting rod is rotatably connected between the driving ring and each of the circle of insertion plates; an inclined positioning shaft is welded to the outer periphery of the limiting ring, and an L-shaped driving rod that is pushed and positioned by a spring is slidably installed on the inclined positioning shaft. Two pull rods are symmetrically rotatably connected between the tail end of the L-shaped driving rod and the outer periphery of the driving ring; the shaft pin is rotatably fitted through the shaft pin sleeve.

[0008] Further, the two first auxiliary support rods and the hydraulic lifting cylinder are both rotatably installed on the vehicle chassis, and the head ends of the two second auxiliary support rods are both rotatably connected to the head end part of the carriage floor; the carriage is rotatably installed on the tail end part of the vehicle chassis.

[0009] Further, positioning square sleeves are slidably mounted on the two first auxiliary support rods. L-shaped bearing plates are welded to the opposite sides of the two positioning square sleeves. Two positioning bolts that support each other are screwed through the two positioning square sleeves.

[0010] Positioning holes are respectively formed in the head portions of the two first auxiliary support rods. When disassembling and overhauling the hydraulic lifting cylinder, the two positioning square sleeves slide to a high position on the head portions of the two first auxiliary support rods. The two positioning bolts are inserted through and matched with the two positioning holes. At the same time, the two second auxiliary support rods swing and abut against the horizontal portions of the two L-shaped bearing plates under the heavy pressure of the carriage, and the heads of the two L-shaped driving rods respectively abut against the vertical portions of the two L-shaped bearing plates.

[0011] Further, the pin sleeve is limited between the two limit rings.

[0012] Further, the vehicle chassis is integrally composed of two longitudinally arranged long side rods and three transverse rib plates that are welded at equal intervals between the two longitudinally arranged long side rods. Four triangular mounting plates are symmetrically welded in pairs at the top of the middle transverse rib plate. The tails of the two first auxiliary support rods are respectively rotationally connected to two groups of triangular mounting plates.

[0013] Further, two T-shaped mounting plates are symmetrically fixed on one long side of the middle transverse rib plate. The tail end of the hydraulic lifting cylinder is rotationally connected to the two T-shaped mounting plates.

[0014] Further, the head of the L-shaped driving rod directly abuts against the vertical portion of the L-shaped bearing plate.

[0015] The outer peripheries of the two end portions of the pin are in rotational contact with the inner peripheries of the pin holes formed through the two first auxiliary support rods.

[0016] Further, a guide wheel is rotationally mounted at the head of the L-shaped driving rod. The head of the L-shaped driving rod abuts against the vertical portion of the L-shaped bearing plate through the guide wheel.

[0017] Further, rubber rings are fixedly arranged on the inner peripheries of the pin holes formed through the two first auxiliary support rods. The outer peripheries of the two end portions of the pin are in rotational frictional contact with the two rubber rings correspondingly.

[0018] The lifting device for a dump truck provided by the present invention has the following beneficial effects:

[0019] 1. By jointly using two sets of first crank-slider structures and two sets of second crank-slider structures, the present invention only needs to perform simple actions of synchronously sliding up two L-shaped driving rods and loosening two L-shaped driving rods to drive the two-ring plug plates to synchronously insert and extract inside and outside, and complete the locking and unlocking of the shaft pin at one time. Compared with the prior art in which the shaft pin is positioned by two snap rings, when disassembling and overhauling the hydraulic lifting cylinder and performing the insertion and extraction of the shaft pin, the trouble of using an external expansion tool to expand the two snap rings to unlock and lock the two snap rings can be saved. The operation is convenient and helps to indirectly improve the disassembly and assembly efficiency of the hydraulic lifting cylinder during maintenance.

[0020] 2. Through the power transmission of the vertical parts of two L-shaped bearing plates and jointly using the reverse pushing effect of the springs on two inclined positioning shafts, during the maintenance process, the two L-shaped driving rods can utilize the up and down pushing of the two second auxiliary struts and the telescopic driving force of the carriage by the hydraulic lifting cylinder to slide up and down and drive the two-ring plug plates to synchronously insert and extract inside and outside to lock and unlock the shaft pin. This saves the trouble of manually operating the two L-shaped driving rods to lock and unlock the shaft pin, saving time and effort, and helps to improve the convenience of the shaft pin disassembly and assembly operation.

[0021] 3. The two limit rings can limit and hold the shaft pin sleeve between them to prevent the shaft pin sleeve from jolting under the action of the lifting force when the hydraulic lifting cylinder pushes up the two second auxiliary struts and the carriage after the inspection is completed, and transfer the jolting stress to the unpositioned shaft pin, driving the shaft pin to reciprocate and slide, resulting in the dislocation of the two annular positioning grooves and the two-ring plug plates, so that the two-ring plug plates cannot be normally inserted and matched with the two annular positioning grooves to complete the repositioning of the shaft pin.

[0022] 4. Since the shaft pin is not yet inserted and positioned when it is reinserted between the two second auxiliary struts after the inspection is completed, the shaft pin can actually rotate freely in the pin holes on the two second auxiliary struts at this time. Thus, when the hydraulic lifting cylinder lifts and pushes the two second auxiliary struts and the carriage through the shaft pin sleeve and the shaft pin at this time, the shaft pin can still rotate in the two pin holes and reciprocate and slide under the effect of the rotational displacement, resulting in the dislocation of the two annular positioning grooves and the two-ring plug plates. The two rubber rings can position the shaft pin to a certain extent through the extrusion friction force generated between them and the two end parts of the shaft pin, and counteract the reciprocating sliding generated under the above rotational displacement effect, keeping the two annular positioning grooves in a state aligned with the two-ring plug plates, ensuring the normal insertion and positioning of the two-ring plug plates and the two annular positioning grooves, and avoiding the occurrence of the above problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0024] The accompanying drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0025] In the accompanying drawings:

[0026] Figure 1 It shows a schematic diagram of the positioning square sleeve in the low position in the first embodiment of the present invention;

[0027] Figure 2 It shows a schematic diagram of the positioning square sleeve in the high position in the first embodiment of the present invention;

[0028] Figure 3 It shows a schematic diagram of the installation position of the shaft pin in the first embodiment of the present invention;

[0029] Figure 4 It shows a schematic diagram of the disassembly state of the shaft sleeve and the shaft pin in the first embodiment of the present invention;

[0030] Figure 5 It shows the Figure 1 schematic diagram of the enlarged structure of part A in the first embodiment of the present invention;

[0031] Figure 6 It shows the Figure 2 schematic diagram of the enlarged structure of part B in the first embodiment of the present invention;

[0032] Figure 7 It shows a schematic diagram of the disassembly state of the plug board and the drive ring in the first embodiment of the present invention;

[0033] Figure 8 It shows a schematic diagram of the half-section internal structure of the shaft sleeve in the first embodiment of the present invention;

[0034] Figure 9 It shows a schematic diagram of the installation positions of the guide wheel and the rubber ring in the second embodiment of the present invention.

[0035] List of reference numerals:

[0036] 1. Hydraulic lifting cylinder; 101. Shaft pin sleeve;

[0037] 2. First auxiliary support rod; 201. Positioning hole;

[0038] 3. Second auxiliary support rod; 301. Shaft sleeve; 3011. Limit ring; 302. Retaining ring; 303. Drive ring; 304. Connecting rod; 305. Tilt positioning shaft; 306. L-shaped drive rod; 3061. Guide wheel; 307. Pull rod; 308. Plug board; 309. Rubber ring;

[0039] 4. Positioning square sleeve; 401. L-shaped bearing plate; 402. Positioning bolt;

[0040] 5. Shaft pin; 501. Annular positioning groove;

[0041] 6. Compartment;

[0042] 7. Vehicle chassis; 701. T-shaped mounting plate; 702. Triangular mounting plate. Detailed implementation manners

[0043] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] For Embodiment 1, please refer to Figures 1 to 8 :

[0045] The present invention provides a lifting device for a dump truck, which is arranged between a compartment 6 and a vehicle chassis 7, and includes a hydraulic lifting cylinder 1, two first auxiliary struts 2 and two second auxiliary struts 3. The head end of the telescopic rod of the hydraulic lifting cylinder 1 is welded with a pin sleeve 101. The head ends of the two first auxiliary struts 2 are rotatably connected to the tail ends of the two second auxiliary struts 3 correspondingly;

[0046] On the half section of the two second auxiliary struts 3 close to the tail end, two relatively supported shaft sleeves 301 are welded. A pin 5 is inserted through the two second auxiliary struts 3 and the two shaft sleeves 301. Two annular positioning grooves 501 are symmetrically arranged at both ends of the pin 5; A limiting ring 3011 is welded to the head end part of the shaft sleeve 301. A retaining ring 302 is welded and sleeved in the peripheral space of the tail end part of the shaft sleeve 301. A circle of insertion plates 308 is slidably installed through the retaining ring 302 and the tail end part of the shaft sleeve 301. The head end parts of the circle of insertion plates 308 are inserted and matched with the annular positioning grooves 501; A driving ring 303 is slidably sleeved on the part of the shaft sleeve 301 between the retaining ring 302 and the limiting ring 3011. A connecting rod 304 is rotatably connected between the driving ring 303 and each of the circle of insertion plates 308; An inclined positioning shaft 305 is welded to the outer periphery of the limiting ring 3011. An L-shaped driving rod 306 that is pushed and positioned by a spring is slidably installed on the inclined positioning shaft 305. Two pull rods 307 are symmetrically rotatably connected between the tail end of the L-shaped driving rod 306 and the outer periphery of the driving ring 303; The pin 5 is rotatably inserted and matched with the pin sleeve 101.

[0047] Preferably, the two first auxiliary struts 2 and the hydraulic lifting cylinder 1 are both rotatably installed on the vehicle chassis 7. The head ends of the two second auxiliary struts 3 are both rotatably connected to the head end part of the bottom plate of the compartment 6; The compartment 6 is rotatably installed on the tail end part of the vehicle chassis 7.

[0048] Preferably, positioning square sleeves 4 are slidably installed on both of the two first auxiliary support rods 2. L-shaped bearing plates 401 are welded to the opposite sides of the two positioning square sleeves 4. Two positioning bolts 402 that support each other in opposite directions are screwed through the two positioning square sleeves 4. Positioning holes 201 are respectively formed through the first ends of the two first auxiliary support rods 2.

[0049] Preferably, the shaft pin sleeve 101 is limited between the two limit rings 3011.

[0050] Preferably, the vehicle chassis 7 is integrally composed of two longitudinally arranged long side rods and three transverse rib plates welded at equal intervals between the two longitudinally arranged long side rods. Four triangular mounting plates 702 are symmetrically welded in pairs at the top of the middle transverse rib plate. The second ends of the two first auxiliary support rods 2 are rotatably connected to two groups of triangular mounting plates 702 correspondingly.

[0051] Preferably, two T-shaped mounting plates 701 are symmetrically fixed to one long side of the middle transverse rib plate. The second end of the hydraulic lifting cylinder 1 is rotatably connected to the two T-shaped mounting plates 701.

[0052] Preferably, the first end of the L-shaped driving rod 306 directly abuts against the vertical part of the L-shaped bearing plate 401. The outer peripheries of the two ends of the shaft pin 5 are in rotational contact with the inner peripheries of the pin holes formed through the two first auxiliary support rods 2 directly.

[0053] The working principle, specific details, implementation steps, functions and interrelationships of each feature, and the roles played in the process of implementing the present invention are elaborated and explained in detail as follows:

[0054] The two first auxiliary support rods 2 and the two second auxiliary support rods 3 together form a multi-link folding auxiliary support mechanism. Through the power transmission between the shaft pin 5 and the shaft pin sleeve 101, when the hydraulic lifting cylinder 1 extends, it can drive the auxiliary support mechanism to extend and lift the carriage 6 to unload the materials. When the hydraulic lifting cylinder 1 contracts, it can drive the auxiliary support mechanism to fold and contract, and control the carriage 6 to descend and reset.

[0055] When the two circular insertion plates 308 are respectively inserted and matched with the two annular positioning grooves 501, the shaft pin 5 can be blocked and limited between the two first auxiliary support rods 2, preventing the shaft pin 5 from disengaging between the two second auxiliary support rods 3 when the hydraulic lifting cylinder 1 lifts the carriage 6 through the shaft pin 5.

[0056] When disassembling and assembling the hydraulic lifting cylinder 1 before and after maintenance, it is necessary to insert and remove the shaft pin 5 and the shaft pin sleeve 101 to connect, position, disassemble and separate the telescopic rod of the hydraulic lifting cylinder 1 from the second auxiliary support rod 3; a set of first crank-slider structure is jointly formed by a circle of inserting plates 308, a circle of connecting rods 304 and a driving ring 303. Through two sets of such mechanisms, sliding the two driving rings 303 towards each other can drive the two circles of inserting plates 308 to synchronously insert and withdraw inside and outside, and control the two circles of inserting plates 308 to be inserted and matched with or withdrawn from the two annular positioning grooves 501 to position or release the shaft pin 5; two pull rods 307, L-shaped driving rods 306 and a driving ring 303 jointly form a set of second crank-slider mechanism. Through two sets of such mechanisms, synchronously sliding the two L-shaped driving rods 306 upwards can drive the two driving rings 303 to slide towards each other, and control the two circles of inserting plates 308 to slide outwards synchronously to complete the unlocking and releasing of the shaft pin 5. Since the two L-shaped driving rods 306 will slide upwards and compress the springs on the two inclined positioning shafts 305 during the above process, when the two L-shaped driving rods 306 are released, the two springs will automatically push the two L-shaped driving rods 306 downwards to reset and drive the two circles of inserting plates 308 to slide inwards synchronously to insert and lock the shaft pin 5. Thus, through the combined use of two sets of first crank-slider structures and two sets of second crank-slider structures, the present invention only needs the simple actions of synchronously sliding the two L-shaped driving rods 306 upwards and releasing the two L-shaped driving rods 306 to drive the two circles of inserting plates 308 to synchronously insert and withdraw inside and outside, and complete the locking and unlocking of the shaft pin 5 at one time. Compared with the prior art in which the shaft pin 5 is positioned by two snap rings, when disassembling and maintaining the hydraulic lifting cylinder 1 and inserting and removing the shaft pin 5, it is not necessary to use an external expanding tool to expand the two snap rings to unlock and lock the two snap rings, which is convenient to operate and use, and helps to indirectly improve the disassembly and assembly efficiency of the hydraulic lifting cylinder 1 during maintenance.

[0057] When disassembling and maintaining the hydraulic lifting cylinder 1, it is necessary to slide the two positioning square sleeves 4 to a high position on the first ends of the two first auxiliary support rods 2, and rotate and push the two positioning bolts 402 to drive the two positioning bolts 402 to be inserted through and matched with the two positioning holes 201. When the two positioning bolts 402 are inserted through and matched with the two positioning holes 201, the two positioning square sleeves 4 can be inserted and positioned on the first ends of the two first auxiliary support rods 2. After the two positioning bolts 402 position the two positioning square sleeves 4, control the hydraulic lifting cylinder 1 to contract, and drive the two second auxiliary support rods 3 to swing downwards through the contraction of the hydraulic lifting cylinder 1. When the two second auxiliary support rods 3 swing downwards, the tail ends thereof abut against and are limited on the horizontal parts of the two L-shaped bearing plates 401 (refer to Figure 2 and Figure 6 ), at this time, since the two second auxiliary support rods 3 are abutted, blocked and limited, the auxiliary support mechanism composed of them and the two second auxiliary support rods 3 will be integrally positioned and maintained as shown in Figure 2In the L-shaped configuration shown, since the auxiliary support mechanism rotates as a whole around two sets of triangular mounting plates 702, and the carriage 6 rotates around the part where it is connected to the end of the vehicle chassis 7, the rotation centers of the auxiliary support mechanism and the carriage 6 are different. Therefore, when the auxiliary support mechanism is integrally positioned, it can support and hold the carriage 6 in the lifted state, transfer the downward pressing gravity of the carriage 6 from the hydraulic lifting cylinder 1 to its own body, relieve the reverse heavy pressure exerted by the carriage 6 on the hydraulic lifting cylinder 1, and facilitate the disassembly and maintenance of the hydraulic lifting cylinder 1.

[0058] In the above process, when the two second auxiliary struts 3 swing downward, they can drive the two L-shaped drive rods 306 to swing downward synchronously and control the two L-shaped drive rods 306 to abut against the vertical parts of the two L-shaped bearing plates 401. When the two L-shaped drive rods 306 abut against the vertical parts of the two L-shaped bearing plates 401, they can be pushed upward by the vertical parts of the two L-shaped bearing plates 401 and slide upward. After the maintenance is completed, when reinstalling and positioning the hydraulic lifting cylinder 1 and the shaft pin 5, it is necessary to push the two second auxiliary struts 3 and the carriage 6 upward through the hydraulic lifting cylinder 1, control the two second auxiliary struts 3 to swing upward and separate from the two positioning sleeves 4, so as to relieve the force exerted by the carriage 6 on the two positioning sleeves 4 through the two second auxiliary struts 3, and facilitate loosening the two positioning sleeves 4 by rotating the two positioning bolts 402 and sliding the two positioning sleeves 4 downward to reset. In this process, when the two second auxiliary struts 3 are driven to swing upward, they drive the two L-shaped drive rods 306 to move upward and separate from the vertical parts of the two L-shaped bearing plates 401. When the two L-shaped drive rods 306 separate from the vertical parts of the two L-shaped bearing plates 401, the springs on the two inclined positioning shafts 305 will automatically push the two L-shaped drive rods 306 downward to reset. In this way, through the power transmission of the vertical parts of the two L-shaped bearing plates 401 and the combined use of the reverse pushing effect of the springs on the two inclined positioning shafts 305, the two L-shaped drive rods 306 can utilize the telescopic driving force of the hydraulic lifting cylinder 1 pushing the two second auxiliary struts 3 and the carriage 6 up and down during the maintenance process, slide up and down and drive the two rings of insertion plates 308 to insert and extract synchronously inside and outside to lock and unlock the shaft pin 5. This saves the trouble of manually operating the two L-shaped drive rods 306 to lock and unlock the shaft pin 5, saves time and effort, and helps to improve the convenience of the disassembly and assembly operation of the shaft pin 5.

[0059] The two limit rings 3011 can limit and hold the shaft pin sleeve 101 between them, preventing the shaft pin sleeve 101 from jolting under the action of the lifting force of the hydraulic lifting cylinder 1 when the hydraulic lifting cylinder 1 pushes the two second auxiliary struts 3 and the carriage 6 upward after the inspection is completed, and transmitting the jolting stress to the shaft pin 5 that has not been positioned yet, driving the shaft pin 5 to reciprocate and slide, resulting in the misalignment of the two annular positioning grooves 501 and the two rings of insertion plates 308, so that the two rings of insertion plates 308 cannot be normally inserted and matched with the two annular positioning grooves 501 to complete the repositioning of the shaft pin 5.

[0060] Based on Embodiment 1, Embodiment 2 is as follows. Please refer to Figure 9 :

[0061] A tipping truck lifting device further includes a guide wheel 3061 and a rubber ring 309. A guide wheel 3061 is rotatably installed at the head end of the L-shaped driving rod 306, and the head end of the L-shaped driving rod 306 abuts against the vertical part of the L-shaped bearing plate 401 through the guide wheel 3061; rubber rings 309 are fixedly arranged on the inner circumferences of the pin holes penetrating through the two first auxiliary struts 2, and the outer circumferences of the two ends of the axle pin 5 are in rotational frictional contact with the two rubber rings 309 respectively.

[0062] The working principle, specific details, implementation steps, functions and interrelationships of each feature, and the role it plays in implementing the present invention will be elaborated and explained in detail as follows:

[0063] Through its rolling and guiding effect, the guide wheel 3061 can reduce the relative wear between the L-shaped driving rod 306 and the L-shaped bearing plate 401, and extend the service life of the L-shaped driving rod 306 and the L-shaped bearing plate 401.

[0064] It should be noted that: after the detection is completed, when the axle pin 5 is reinstalled between the two second auxiliary struts 3, it has not been inserted and positioned yet. At this time, the axle pin 5 can actually rotate freely in the pin holes of the two second auxiliary struts 3. In this way, when the hydraulic lifting cylinder 1 lifts and pushes the two second auxiliary struts 3 and the carriage 6 through the axle pin sleeve 101 and the axle pin 5, the axle pin 5 can still rotate in the two pin holes and reciprocate and slide under the effect of the rotational displacement, causing the two annular positioning grooves 501 to be misaligned with the two circles of inserting plates 308. However, the two rubber rings 309 can apply a certain degree of positioning to the axle pin 5 through the extrusion friction force generated between the two ends of the axle pin 5 and counteract the reciprocating sliding generated under the above rotational displacement effect, keeping the two annular positioning grooves 501 in a state aligned with the two circles of inserting plates 308, ensuring the normal insertion and positioning of the two circles of inserting plates 308 and the two annular positioning grooves 501, and avoiding the occurrence of the above problems.

[0065] In this article, the following points need to be noted:

[0066] 1. The attached drawings of the embodiments of the present invention only relate to the structures involved in the embodiments of the present invention, and other structures can refer to the general design.

[0067] 2. Without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0068] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A dump truck lifting device, arranged between a vehicle compartment and a vehicle chassis, comprising a hydraulic lifting cylinder, two first auxiliary support rods and two second auxiliary support rods, wherein the head end of the telescopic rod of the hydraulic lifting cylinder is welded with an axle pin sleeve, and the head ends of the two first auxiliary support rods are correspondingly rotatably connected to the tail ends of the two second auxiliary support rods; It is characterized in that Two relatively supporting shaft sleeves are welded on the half sections of the two second auxiliary support rods near the tail end, and an axle pin is inserted through the two second auxiliary support rods and the two shaft sleeves, and two annular positioning grooves are symmetrically opened at the two end parts of the shaft pin; a limiting ring is welded on the head end part of the shaft sleeve, and a retaining ring is welded and sleeved in the outer space of the tail end part of the shaft sleeve, and the retaining ring and the tail end part of the shaft sleeve are jointly penetrated and slidably installed with a circle of plug plates, and the head end parts of the circle of plug plates are all plugged and matched with the annular positioning grooves; a part of the shaft sleeve located between the retaining ring and the limiting ring is slidably sleeved with a driving ring, and the driving ring and the circle of plug plates are rotatably connected with connecting rods; an inclined positioning shaft is welded on the outer periphery of the limiting ring, and an L-shaped driving rod positioned by spring pushing is slidably installed on the inclined positioning shaft, and two pull rods are symmetrically rotatably connected between the tail end of the L-shaped driving rod and the outer periphery of the driving ring; the shaft pin and the shaft pin sleeve are rotatably matched; Positioning square sleeves are slidably mounted on the two first auxiliary support rods, L-shaped bearing plates are welded on opposite sides of the two positioning square sleeves, and two positioning bolts supporting each other are screwed and mounted through the two positioning square sleeves; The head ends of the two first auxiliary support rods are penetrated with positioning holes. When the hydraulic lifting cylinder is disassembled and repaired, the two positioning square sleeves slide to a high position on the head ends of the two first auxiliary support rods, and the two positioning bolts are plugged into the two positioning holes. At the same time, the two second auxiliary support rods swing down under the heavy pressure of the car and rest on the horizontal parts of the two L-shaped load-bearing plates, and the head ends of the two L-shaped driving rods are in contact with the vertical parts of the two L-shaped load-bearing plates.

2. A dump truck lifting device according to claim 1, characterized in that: The first two auxiliary support rods and hydraulic lifting cylinders are both rotatably mounted on the vehicle chassis, and the head ends of the second two auxiliary support rods are both rotatably connected to the head end portion of the vehicle compartment floor; the vehicle compartment is rotatably mounted on the rear end portion of the vehicle chassis.

3. A dump truck lifting device according to claim 1, characterized in that: The shaft pin sleeve is limited between two limiting rings.

4. A dump truck lifting device according to claim 1, characterized in that: The vehicle chassis as a whole is composed of two longitudinal long side rods and three transverse ribs welded between the two longitudinal long side rods at equal intervals, wherein four triangular mounting plates are symmetrically welded in groups of two at the top of the middle transverse rib, and the tail ends of the two first auxiliary support rods are rotatably connected to the two groups of triangular mounting plates.

5. A dump truck lifting device according to claim 4, characterized in that: Two T-shaped mounting plates are symmetrically fixed on one long side of the middle transverse rib plate, and the tail end of the hydraulic lifting cylinder is rotatably connected to the two T-shaped mounting plates.

6. A dump truck lifting device according to claim 1, characterized in that: The head end of the L-shaped driving rod directly abuts against the upright portion of the L-shaped bearing plate; The outer peripheries of the two end portions of the shaft pin are directly in rotational contact with the inner peripheries of the pin holes penetrating through the two first auxiliary support rods.

7. The dump truck lifting device according to claim 1, characterized in that: A guide wheel is rotatably mounted on the head end of the L-shaped driving rod, and the head end of the L-shaped driving rod is in contact with the upright part of the L-shaped bearing plate through the guide wheel.

8. The dump truck lifting device according to claim 1, characterized in that: The inner circumferences of the pin holes penetrating through the two first auxiliary support rods are fixedly provided with rubber rings, and the outer circumferences of the two end portions of the shaft pin are in rotational friction contact with the two rubber rings.

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