Lifting oil cylinder suitable for tilting cart

Abstract

The invention discloses a lifting oil cylinder suitable for a tilting cart, and relates to the field of lifting oil cylinders, the lifting oil cylinder comprises an oil cylinder main body, a piston rod is slidably connected in the oil cylinder main body, a limiting block is fixedly mounted at the top of the oil cylinder main body, and a protection assembly is connected to the outer wall of the oil cylinder main body in a sleeving manner; and a first connecting bearing is fixedly mounted at one end of the piston rod. The protection assembly is arranged on the outer wall of the oil cylinder body, when a carriage is subjected to high-strength impact, the protection plate can prevent the piston rod from being bent due to too large pressure, and due to the fact that the radian of the inner side of the protection plate is completely the same as that of the edge of the piston rod, the protection plate can be perfectly attached to the outer wall of the piston rod; even if the tilting cart stays at an uneven position, the problem that the piston rod is bent and deformed due to lateral pressure can be solved, and it is ensured that a carriage is always in a smooth state during lifting.

Description

Technical Field

[0001] The invention relates to the technical field of lifting cylinders, in particular to a lifting cylinder suitable for a dump truck. Background Art

[0002] A dump truck is a special transport vehicle, which is mainly used to transport various bulk materials, such as sand, gravel, coal, soil, etc. It is characterized by a tiltable carriage, which can be lifted to a certain angle through a lifting mechanism so that the material can be automatically unloaded under the action of gravity.

[0003] For example, the "A lifting hydraulic cylinder" with publication number CN111285283A includes a base plate, a first storage bin and a T-bar. One side of the base plate is movably connected to a limit block through two sets of connecting mechanisms, wherein a shock-absorbing spring is arranged between the two sets of connecting mechanisms, and two positioning blocks are arranged inside the shock-absorbing spring, wherein one positioning block is connected to the limit block, and the other positioning block is connected to the base plate, and a bearing is arranged at the middle position of the limit block.

[0004] However, in the prior art, during the process of unloading materials, the blocks of material in the carriage will continue to move. When they roll, they will generate a certain amount of impact force on the carriage. The pressure generated by multiple materials impacting the carriage at the same time will exceed the pressure that the piston rod can withstand in a short period of time, which can easily cause the piston rod to bend. In addition, when the dump truck is parked in an uneven position, the vehicle body itself will be tilted at a certain angle. During the process of lifting the carriage, an unbalanced force will occur, causing the piston rod to be subjected to lateral pressure and also bend and deform. The bent piston rod will affect the normal operation of the lifting cylinder, resulting in uneven lifting of the carriage or even failure to lift. Summary of the invention

[0005] The purpose of the present invention is to provide a lifting cylinder suitable for a dump truck to solve the problem raised in the above background technology that when it rolls, it will generate a certain amount of impact force on the car body, and the pressure generated by multiple materials impacting the car body at the same time will exceed the pressure that the piston rod can withstand in a short time, which can easily cause the piston rod to bend.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lifting oil cylinder suitable for a dump truck, comprising an oil cylinder body, a piston rod is slidably connected inside the oil cylinder body, a limit block is fixedly installed on the top of the oil cylinder body, a protection component is sleeved on the outer wall of the oil cylinder body, a first connecting bearing is fixedly installed on one end of the piston rod, both sides of the first connecting bearing are rotatably connected with a reinforcement component, one end of the reinforcement component is fixedly connected to the limit block, and the reinforcement component and the protection component are perpendicular to each other;

[0007] The protection assembly includes a positioning rod and a protection plate. The two positioning rods are symmetrically arranged along the center line of the cylinder body. The protection plate is located between the two positioning rods. The protection plate is a metal plate made of alloy material with an arc-shaped cross-section, and the curvature of the inner arc surface of the protection plate is the same as the curvature of the arc surface on the edge of the piston rod. Connecting plates are fixedly installed on both sides of the protection plate. Extension rods are fixedly installed near the two ends of the positioning rods. The extension rods are perpendicular to the positioning rods, and one end of the connecting plate is slidably connected to the inside of the extension rod.

[0008] Preferably, bending rods are fixedly installed at both ends of the positioning rod, one end of one of the bending rods is fixedly connected to a limiting ring, the limiting ring is sleeved on the outer wall of the cylinder body, a second connecting bearing is fixedly installed on the bottom of the cylinder body, the limiting ring is located above the second connecting bearing, and one end of the other bending rod is fixedly connected to one side of the first connecting bearing.

[0009] Preferably, a receiving cavity is provided on the inner side of the extension rod, a guide rod parallel to the extension rod is fixedly mounted on the inner wall of the receiving cavity, one end of the connecting plate is sleeved on the outer wall of the guide rod, and a through hole is provided at the junction of the connecting plate and the guide rod.

[0010] Preferably, an inclined rod is fixedly mounted on one side of the extension rod, a main gear is rotatably mounted on the end of the inclined rod, and a driven gear is rotatably mounted on the junction of the inclined rod and the extension rod.

[0011] Preferably, the middle sections of the main gear and the driven gear are both provided with an annular groove, and a transmission belt is movably connected between the main gear and the driven gear, and the transmission belt is located on the outer wall of the annular groove.

[0012] Preferably, the area near the top of the oil cylinder body is linearly and evenly spaced with convex teeth, the main gear and the convex teeth are located on the same straight line, and the width of the convex teeth is equal to that of the main gear.

[0013] Preferably, a tooth plate is fixedly mounted on one side of one of the connecting plates, and the connecting plate is meshedly connected with the driven gear through the tooth plate.

[0014] Preferably, the reinforcement assembly includes a support rod and a reinforcement rod, one end of the support rod is fixedly connected to one side of the limit block, one end of the support rod is rotatably connected to a connecting frame, and the connecting frame is slidably connected to the inside of the support rod.

[0015] Preferably, a rectangular block is fixedly mounted on one side of the first connecting bearing, one end of the reinforcing rod is rotatably connected to the inside of the rectangular block, a notch is provided at a corner of the rectangular block, and one end of the reinforcing rod is located inside the notch.

[0016] Preferably, a guide slot is provided at the junction of the support rod and the connecting frame, the guide slot is arranged along the direction of the support rod, a gap is connected between the two guide slots, and the bottom of the connecting frame is located inside the gap.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, by arranging a protection component on the outer wall of the oil cylinder body, when the piston rod is extended, the positioning rod will be driven together, so that the protection plate will be brought to the side of the piston rod. When the piston rod is extended to the maximum length, the protection plate will move along the direction of the extension rod until it fits to the surface of the piston rod. At this time, the protection plate can play a role in reinforcing the piston rod. When the car body is subjected to a high-intensity impact, the protection plate can prevent the piston rod from bending due to excessive pressure. Moreover, since the curvature of the inner side of the protection plate is exactly the same as the curvature of the edge of the piston rod, the protection plate can fit perfectly on the outer wall of the piston rod. Even if the dump truck stays in an uneven position, the problem of the piston rod bending and deformation due to lateral pressure can be solved, ensuring that the lifting of the car body is always in a smooth state.

[0019] 2. In the present invention, by arranging reinforcement components on both sides of the first connecting bearing, during the process of extending the piston rod, the first connecting bearing will drive the reinforcement rod through the rectangular block, and a triangular structure is formed between the reinforcement rod, the support rod and the piston rod. Moreover, since the reinforcement rod is located on both sides of the piston rod, an isosceles triangle is formed as a whole. By utilizing the relatively stable characteristics of the triangle, the piston rod can be reinforced. When the piston rod is subjected to pressure, the reinforcement rod can disperse the pressure to the support rod. Moreover, since the reinforcement rod is connected to the support rod through a connecting frame, while dispersing the pressure, the friction between the connecting frame and the support rod can be utilized to reduce the pressure on the piston rod, thereby further reducing the probability of the piston rod bending.

[0020] 3. In the present invention, an inclined rod is arranged on the side of the extension rod, and a main gear and a bevel gear are installed on the inclined rod, and the main gear and the bevel gear are connected by a transmission belt. When the first connecting bearing starts to drive the positioning rod, the main gear will accurately mesh with the convex teeth on the outer wall of the cylinder body. This meshing is the starting point of the entire power transmission. As the subsequent positioning rod continues to move, the convex teeth will continue to apply thrust to the main gear. Under the action of this thrust, the main gear will transmit power to the driven gear through the transmission belt. After receiving the power, the driven gear will generate enough force to push the tooth plate. The pushing process of the tooth plate is the core link of the entire design. It utilizes the linkage relationship between these gears, so that the protection plate can achieve stable movement without the need for additional configuration of other power sources. The advantages of this design are very significant. In a specific working environment such as a dump truck, due to the complexity of its work site and the compactness of the vehicle's own structure, reducing unnecessary power source configuration can not only reduce costs, but also reduce the overall weight and complexity of the vehicle, which makes the vehicle more flexible during operation and more convenient in maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of a lifting cylinder suitable for a dump truck according to the present invention;

[0022] Figure 2 A top view of a lifting cylinder suitable for a dump truck according to the present invention;

[0023] Figure 3 It is a side view of a lifting cylinder suitable for a dump truck of the present invention;

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of a reinforcement component of a lifting cylinder suitable for a dump truck according to the present invention;

[0025] Figure 5 A half-section schematic diagram of a support rod structure of a lifting cylinder suitable for a dump truck according to the present invention;

[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of a protection component of a lifting cylinder of a dump truck according to the present invention;

[0027] Figure 7 This is a schematic diagram of the disassembly of a protective plate and a positioning rod structure of a lifting cylinder suitable for a dump truck according to the present invention;

[0028] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure of part A.

[0029] In the figure: 1. Cylinder body; 2. Piston rod; 3. First connecting bearing; 4. Reinforcement assembly; 5. Protection assembly; 6. Second connecting bearing; 7. Limit block; 8. Protruding tooth; 41. Support rod; 42. Reinforcement rod; 43. Connecting frame; 44. Rectangular block; 45. Notch; 46. Guide slide groove; 47. Gap; 51. Positioning rod; 52. Bending rod; 53. Limiting ring; 54. Extension rod; 55. Oblique rod; 56. Protection plate; 57. Connecting plate; 58. Through hole; 59. Tooth plate; 510. Accommodating cavity; 511. Guide rod; 512. Main gear; 513. Driven gear; 514. Annular groove; 515. Transmission belt. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown: a lifting cylinder suitable for a dump truck, comprising a cylinder body 1, a piston rod 2 is slidably connected inside the cylinder body 1, a limit block 7 is fixedly installed on the top of the cylinder body 1, a protection component 5 is sleeved on the outer wall of the cylinder body 1, a first connecting bearing 3 is fixedly installed on one end of the piston rod 2, and both sides of the first connecting bearing 3 are rotatably connected with a reinforcement component 4, one end of the reinforcement component 4 is fixedly connected to the limit block 7, the reinforcement component 4 and the protection component 5 are perpendicular to each other, the reinforcement component 4 is arranged on the left and right sides of the piston rod 2, and the protection component 5 is arranged on the upper and lower sides of the piston rod 2, and the angle between the two is ninety degrees. The mutually perpendicular arrangement is conducive to the dispersion of pressure, ensuring that the protection component 5 and the reinforcement component 4 can play the best role, the piston rod 2 is slidably connected to the inside of the cylinder body 1, and the piston rod 2 is pushed out by the cylinder body 1 when in use, so as to achieve the purpose of changing the angle of the dump truck compartment. This is a prior art and will not be described in detail here. The limit block 7 will determine the maximum extension length and the maximum retraction length of the piston rod 2;

[0032] The protection assembly 5 includes a positioning rod 51 and a protection plate 56. The two positioning rods 51 are symmetrically arranged along the center line of the oil cylinder body 1. The protection plate 56 is located between the two positioning rods 51. The protection plate 56 is a metal plate made of alloy material with an arc-shaped cross section, and the curvature of the inner arc surface of the protection plate 56 is the same as the curvature of the edge arc surface of the piston rod 2. Connecting plates 57 are fixedly installed on both sides of the protection plate 56. Extension rods 54 are fixedly installed at the parts of the positioning rods 51 near both ends. The extension rods 54 and the positioning rods 51 are perpendicular to each other. One end of the connecting plate 57 is slidably connected to the inside of the extension rod 54. The positioning rod 51 is set at the edge of the oil cylinder body 1, and the connecting plate 57 is slidably connected to the inside of the extension rod 54. When in use, the protection plate 56 will move along the direction of the extension rod 54 until it fits on the surface of the piston rod 2 to reinforce its structure and prevent it from bending. The same curvature can ensure that the protection plate 56 fits perfectly on the surface of the piston rod 2.

[0033] Bending rods 52 are fixedly installed at both ends of the positioning rod 51, one end of one of the bending rods 52 is fixedly connected to a limiting ring 53, the limiting ring 53 is sleeved on the outer wall of the cylinder body 1, and a second connecting bearing 6 is fixedly installed at the bottom of the cylinder body 1, and the limiting ring 53 is located above the second connecting bearing 6, one end of the other bending rod 52 is fixedly connected to one side of the first connecting bearing 3, the bending rod 52 at one end of the positioning rod 51 is connected to the limiting ring 53, the limiting ring 53 is sleeved on the cylinder body 1, and the bending rod 52 at the other end of the positioning rod 51 is fixedly connected to the first connecting bearing 3, thereby determining the position of the positioning rod 51.

[0034] In this embodiment, the bottom of the oil cylinder body 1 is rotatably connected to the dump truck body through the second connecting bearing 6, and the top of the piston rod 2 is rotatably connected to the dump truck compartment through the first connecting bearing 3. During the extension of the piston rod 2, the first connecting bearing 3 drives the positioning rod 51 through the bending rod 52. During the extension of the piston rod 2 to the maximum length, the connecting plates 57 on both sides of the protection plate 56 move along the direction of the extension rod 54 until the protection plate 56 is completely attached to the outer wall of the piston rod 2.

[0035] The protective plate 56 can reinforce the piston rod 2. When the car body is subjected to a high-intensity impact, the protective plate 56 can prevent the piston rod 2 from bending due to excessive pressure. Since the curvature of the inner side of the protective plate 56 is exactly the same as the curvature of the edge of the piston rod 2, the protective plate 56 can fit perfectly on the outer wall of the piston rod 2. Even if the dump truck stays in an uneven position, it can solve the problem of the piston rod 2 bending and deforming due to lateral pressure, thereby ensuring that the lifting of the car body is always in a smooth state.

[0036] Embodiment 2: According to Figure 6 , Figure 7 Figure 8As shown, a receiving cavity 510 is provided on the inner side of the extension rod 54, and a guide rod 511 parallel to the extension rod 54 is fixedly installed on the inner wall of the receiving cavity 510, one end of the connecting plate 57 is sleeved on the outer wall of the guide rod 511, and a through hole 58 is provided at the intersection of the connecting plate 57 and the guide rod 511, and an inclined rod 55 is fixedly installed on one side of the extension rod 54, and a main gear 512 is rotatably installed at the end of the inclined rod 55, and a driven gear 513 is rotatably installed at the intersection of the inclined rod 55 and the extension rod 54, and the middle section of the main gear 512 and the driven gear 513 are connected to each other. The middle section of the gear 513 is provided with an annular groove 514, and a transmission belt 515 is movably connected between the main gear 512 and the driven gear 513. The transmission belt 515 is located on the outer wall of the annular groove 514. The area near the top of the cylinder body 1 is linearly and evenly arranged with convex teeth 8. The main gear 512 and the convex teeth 8 are located on the same straight line, and the width of the convex teeth 8 is equal to the width of the main gear 512. A tooth plate 59 is fixedly installed on one side of one of the connecting plates 57, and the connecting plate 57 is meshed with the driven gear 513 through the tooth plate 59.

[0037] In this embodiment, the receiving cavity 510 is used to receive the connecting plate 57. The connecting plate 57 is sleeved on the guide rod 511 through the through hole 58. During the movement of the connecting plate 57, the guide rod 511 can determine the moving route of the connecting plate 57. Since the connecting plate 57 is a rectangular structure, it will not rotate during the movement.

[0038] The inclined rod 55 on the side of the extension rod 54 is used to determine the position of the main gear 512 and the driven gear 513, ensuring that the main gear 512 and the driven gear 513 will not affect the movement of the protection plate 56. When the piston rod 2 is gradually extended to the maximum length, the main gear 512 will contact the convex teeth 8 on the outer wall of the cylinder body 1. As the positioning rod 51 continues to move, the convex teeth 8 will eventually push the main gear 512.

[0039] The main gear 512 then drives the driven gear 513 through the transmission belt 515. Since the connecting plate 57 is meshed and connected with the driven gear 513 through the tooth plate 59, the driven gear 513 will push the connecting plate 57 through the tooth plate 59, and finally achieve the purpose of pushing the protective plate 56 to fit onto the piston rod 2, so that the movement of the protective plate 56 does not require the configuration of other power sources, and is more suitable for use on dump trucks. The position of the transmission belt 515 is determined by the annular groove 514 to prevent the transmission belt 515 from being offset.

[0040] Embodiment 3: According to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the reinforcement assembly 4 includes a support rod 41 and a reinforcement rod 42, one end of the support rod 41 is fixedly connected to one side of the limit block 7, one end of the support rod 41 is rotatably connected to a connecting frame 43, the connecting frame 43 is slidably connected to the inside of the support rod 41, a rectangular block 44 is fixedly installed on one side of the first connecting bearing 3, one end of the reinforcement rod 42 is rotatably connected to the inside of the rectangular block 44, a notch 45 is provided at a corner of the rectangular block 44, one end of the reinforcement rod 42 is located inside the notch 45, a guide groove 46 is provided at the junction of the support rod 41 and the connecting frame 43, the guide groove 46 is arranged along the direction of the support rod 41, a gap 47 is connected between the two guide grooves 46, and the bottom of the connecting frame 43 is located inside the gap 47.

[0041] In this embodiment, the reinforcement assembly 4 is arranged on the left and right sides of the piston rod 2. When the piston rod 2 is extended, the first connecting bearing 3 drives the reinforcement rod 42 through the rectangular block 44, forcing the reinforcement rod 42 to rotate. The existence of the notch 45 provides sufficient activity space for the reinforcement rod 42. The reinforcement rod 42, the support rod 41 and the piston rod 2 form a triangular structure. Since the reinforcement rod 42 is located on both sides of the piston rod 2, another isosceles triangle structure is formed. The reinforcement assembly 4 and the piston rod 2 use the relatively stable characteristics of the triangle to reinforce the piston rod 2.

[0042] When the piston rod 2 is subjected to pressure, the reinforcement rod 42 can disperse the pressure to the support rod 41, and use the friction between the connecting frame 43 and the support rod 41 to reduce the pressure on the piston rod 2, thereby further reducing the probability of bending of the piston rod 2. The bottom of the connecting frame 43 is set in the gap 47, and the two sides are set in the guide groove 46. During the movement of the connecting frame 43, the guide groove 46 can determine the moving route of the connecting frame 43, and the existence of the gap 47 makes the connecting frame 43 have two surfaces in contact with the support rod 41, thereby expanding the contact area.

[0043] The use method and working principle of the device: the bottom of the oil cylinder body 1 is rotatably connected to the dump truck body through the second connecting bearing 6, the top of the piston rod 2 is rotatably connected to the dump truck compartment through the first connecting bearing 3, the reinforcement component 4 is arranged on the left and right sides of the piston rod 2, and the protection component 5 is arranged on the upper and lower sides of the piston rod 2, and the angle between the two is ninety degrees. When in use, the oil cylinder body 1 pushes out the piston rod 2 to achieve the purpose of changing the angle of the dump truck compartment;

[0044] When the piston rod 2 is extended, the first connecting bearing 3 first drives the reinforcing rod 42 through the rectangular block 44. The reinforcing assembly 4 and the piston rod 2 use the relatively stable characteristics of the triangle to reinforce the piston rod 2. When the piston rod 2 is under pressure, the reinforcing rod 42 can disperse the pressure to the support rod 41, and use the friction between the connecting frame 43 and the support rod 41 to reduce the pressure on the piston rod 2.

[0045] When the piston rod 2 is about to extend to its maximum length, the main gear 512 will contact the convex teeth 8 on the outer wall of the oil cylinder body 1. As the positioning rod 51 continues to move, the convex teeth 8 will push the main gear 512, and then drive the driven gear 513 through the transmission belt 515. The driven gear 513 pushes the connecting plate 57 through the tooth plate 59, forcing the connecting plate 57 to move along the direction of the guide rod 511, and finally making the protection plate 56 fit onto the piston rod 2.

[0046] The protective plate 56 can reinforce the piston rod 2. When the car body is subjected to a high-intensity impact, the protective plate 56 can prevent the piston rod 2 from bending due to excessive pressure. And because the curvature of the inner side of the protective plate 56 is exactly the same as the curvature of the edge of the piston rod 2, the protective plate 56 can fit perfectly on the outer wall of the piston rod 2.

[0047] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lifting cylinder suitable for a dump truck, comprising a cylinder body (1), a piston rod (2) being slidably connected inside the cylinder body (1), and a limit block (7) being fixedly installed on the top of the cylinder body (1), characterized in that: A protective component (5) is sleeved on the outer wall of the oil cylinder body (1); a first connecting bearing (3) is fixedly mounted on one end of the piston rod (2); both sides of the first connecting bearing (3) are rotatably connected to a reinforcing component (4); one end of the reinforcing component (4) is fixedly connected to a limit block (7); and the reinforcing component (4) and the protective component (5) are perpendicular to each other; The protection assembly (5) comprises a positioning rod (51) and a protection plate (56). The two positioning rods (51) are symmetrically arranged along the center line of the oil cylinder body (1). The protection plate (56) is located between the two positioning rods (51). The protection plate (56) is a metal plate made of alloy material with an arc-shaped cross section. The curvature of the inner arc surface of the protection plate (56) is the same as the curvature of the edge arc surface of the piston rod (2). Connecting plates (57) are fixedly installed on both sides of the protection plate (56). Extension rods (54) are fixedly installed near the two ends of the positioning rod (51). The extension rods (54) and the positioning rods (51) are perpendicular to each other. One end of the connecting plate (57) is slidably connected to the inside of the extension rod (54).

2. A lifting cylinder suitable for a dump truck according to claim 1, characterized in that: Bending rods (52) are fixedly mounted at both ends of the positioning rod (51), one end of one of the bending rods (52) is fixedly connected to a limiting ring (53), the limiting ring (53) is sleeved on the outer wall of the cylinder body (1), a second connecting bearing (6) is fixedly mounted at the bottom of the cylinder body (1), the limiting ring (53) is located above the second connecting bearing (6), and one end of the other bending rod (52) is fixedly connected to one side of the first connecting bearing (3).

3. A lifting cylinder suitable for a dump truck according to claim 2, characterized in that: A receiving cavity (510) is provided on the inner side of the extension rod (54); a guide rod (511) parallel to the extension rod (54) is fixedly mounted on the inner wall of the receiving cavity (510); one end of the connecting plate (57) is sleeved on the outer wall of the guide rod (511); a through hole (58) is provided at the junction of the connecting plate (57) and the guide rod (511).

4. A lifting cylinder suitable for a dump truck according to claim 3, characterized in that: A slanting rod (55) is fixedly mounted on one side of the extension rod (54), a main gear (512) is rotatably mounted on the end of the slanting rod (55), and a driven gear (513) is rotatably mounted at the junction of the slanting rod (55) and the extension rod (54).

5. A lifting cylinder suitable for a dump truck according to claim 4, characterized in that: The middle sections of the main gear (512) and the driven gear (513) are both provided with an annular groove (514), and a transmission belt (515) is movably connected between the main gear (512) and the driven gear (513), and the transmission belt (515) is located on the outer wall of the annular groove (514).

6. A lifting cylinder suitable for a dump truck according to claim 5, characterized in that: The area near the top of the oil cylinder body (1) is linearly and evenly spaced with convex teeth (8), the main gear (512) and the convex teeth (8) are located on the same straight line, and the width of the convex teeth (8) is equal to the width of the main gear (512).

7. A lifting cylinder suitable for a dump truck according to claim 6, characterized in that: A tooth plate (59) is fixedly mounted on one side of one of the connecting plates (57), and the connecting plate (57) is meshingly connected with the driven gear (513) via the tooth plate (59).

8. The lifting cylinder suitable for a dump truck according to claim 1, characterized in that: The reinforcement assembly (4) comprises a support rod (41) and a reinforcement rod (42); one end of the support rod (41) is fixedly connected to one side of the limit block (7); one end of the support rod (41) is rotatably connected to a connecting frame (43); and the connecting frame (43) is slidably connected to the inside of the support rod (41).

9. A lifting cylinder suitable for a dump truck according to claim 8, characterized in that: A rectangular block (44) is fixedly mounted on one side of the first connecting bearing (3), one end of the reinforcing rod (42) is rotatably connected to the inside of the rectangular block (44), a notch (45) is provided at a corner of the rectangular block (44), and one end of the reinforcing rod (42) is located inside the notch (45).

10. A lifting cylinder suitable for a dump truck according to claim 9, characterized in that: A guide slot (46) is provided at the junction of the support rod (41) and the connecting frame (43). The guide slot (46) is arranged along the direction of the support rod (41). A gap (47) is connected between the two guide slots (46). The bottom of the connecting frame (43) is located inside the gap (47).

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