A seamless steel pipe conveying and unloading device

Abstract

A seamless steel pipe conveying and unloading device belongs to the technical field of steel pipe conveying devices. It includes a drive shaft; drive wheels spaced at intervals along the length of the drive shaft; driven wheels rotating to the left of the drive wheels; a conveyor belt fitted between each drive wheel and driven wheel; and a crossbeam fixed to the frame via a crossbeam support arm within the conveyor belt cavity corresponding to each conveyor belt. The driven wheel shaft is connected to the left end of the crossbeam via a driven wheel shaft left-right adjustment mechanism. The key feature is the inclusion of a steel pipe lifting and unloading mechanism, mounted on the driven wheel shaft. When the conveyor belt carrying the seamless steel pipe is turning and changing direction while passing the driven wheel, the seamless steel pipe is picked up and lowered by the steel pipe lifting and unloading mechanism. Advantages: It prevents premature wear, breakage, deformation, and detachment of the pads, effectively protects the service life of the conveyor belt and driven wheels, reduces the workload of equipment maintenance personnel, and saves on equipment maintenance costs.

Description

Technical Field

[0001] This utility model belongs to the technical field of steel pipe conveying devices, specifically relating to a seamless steel pipe conveying and unloading device. Background Technology

[0002] As is well known in the industry, various types of conveying devices (such as roller conveyors, chain conveyors, walking beam conveyors, conveyor belts, etc.) play an indispensable role in the complete production process of steel pipe enterprises. Their function goes beyond simple material handling; they deeply intervene in and determine production efficiency, cost, quality, and safety. A typical example is connecting independent processing areas such as piercing, hot rolling, heat treatment, and finishing into an automated, uninterrupted continuous production line. Therefore, without an efficient and reliable conveying system, the high-capacity production pace of modern steel pipe enterprises would be impossible.

[0003] The aforementioned seamless steel pipe conveying and unloading device is usually, but not limited to, located after the finishing, inspection (including straightening, flaw detection, hydrostatic testing, etc.) and packaging processes of the finished pipe. Moreover, it often adopts a conveyor belt structure. The core task of the conveyor belt is to ensure that the steel pipe is moved horizontally or stacked after all the processing and inspection of the steel pipe is completed. It is particularly suitable for avoiding surface scratches and bumps during unloading.

[0004] The existing seamless steel pipe blanking device has the following structure: Driven wheels are spaced along the length of a power shaft (also called the "drive shaft") driven by a power unit. Driven wheels, in equal numbers to the number of drive wheels, are positioned at positions corresponding to the drive wheels. A ring-shaped, strip-shaped conveyor belt without end is fitted between each drive and driven wheel. Pads are spaced on the outer surface of the conveyor belt. A crossbeam is installed within the conveyor belt cavity corresponding to the length of each conveyor belt. The crossbeam is supported by the upper end of a crossbeam support arm, and the lower end of the crossbeam support arm is fixed to the frame. The drive shaft is rotatably supported on the frame, and the driven wheels are rotatably positioned at the end of the crossbeam opposite to the drive shaft.

[0005] During operation, the aforementioned power unit drives the power shaft and the drive wheel to rotate. The drive wheel drives the conveyor belt, which in turn drives the driven wheel. This creates a continuous transport plane (also known as a "transfer plane") between the drive and driven wheels, fulfilling the requirement of outputting and lowering the seamless steel pipes to be transported. The upper surface of the aforementioned crossbeam also serves to support and guide the conveyor belt.

[0006] The seamless steel pipe conveyor unloading device described above exhibits the following shortcomings in actual use: Because the driven wheel is designed with the same structure as the driving wheel (i.e., the driven wheel is a cylinder of equal diameter), when the conveyor belt runs straight along its surface and the steel pipe reaches the top of the wheel rim to fall, the contact point between the pipe and the conveyor belt and the pad changes instantaneously. The steel pipe is thrown out or scraped as it falls due to its own weight and centrifugal force. During this instantaneous turning and falling period, the steel pipe experiences intense friction against the side of the redirecting pad on the conveyor belt at the driven wheel, causing premature damage to the pad. If this damage is not detected and addressed promptly (e.g., by replacing the pad), it will damage the conveyor belt and the driven wheel. However, timely detection of pad damage is relatively difficult for equipment maintenance personnel, and may even be unsatisfactory.

[0007] Based on the above, how to address the turning effect—that is, how to intervene in the centrifugal tendency of an object to damage the pad due to inertia when passing through a curved track—has become a technical problem that seamless steel pipe manufacturers are concerned about and hope to solve effectively. However, no applicable technical inspiration has been found in the publicly available patent and non-patent literature to date. The technical solution to be introduced below arose in this context. Utility Model Content

[0008] The objective of this invention is to provide a seamless steel pipe conveying and unloading device that helps to significantly reduce the severe friction, wear, and impact on the pad at the bend when the steel pipe falls, thereby preventing premature wear, cracking, and detachment of the pad, and also effectively ensuring the service life of the conveyor belt and driven wheel, reducing the workload of equipment maintenance personnel, and saving equipment maintenance costs.

[0009] The present invention accomplishes its objective as follows: a seamless steel pipe conveying and unloading device includes a drive shaft driven by a power device and rotatably mounted on a frame during use; drive wheels spaced apart along the length of the drive shaft and rotating with it; driven wheels, equal in number to the drive wheels, rotatably mounted on the left side of each drive wheel via driven wheel shafts; a conveyor belt without end points, fitted between each drive wheel and driven wheel, with pads fixed at intervals on its outward-facing side; a crossbeam corresponding to the conveyor belt cavity of each conveyor belt and fixed to the frame via a crossbeam support arm; the driven wheel shafts are connected to the left end of the crossbeams via a driven wheel shaft left-right adjustment mechanism; characterized in that it further includes a steel pipe lifting and unloading mechanism mounted on the driven wheel shafts, wherein when the conveyor belt carrying the seamless steel pipe is at a turning and reversing position while passing the driven wheels, the seamless steel pipe is picked up and lowered by the steel pipe lifting and unloading mechanism.

[0010] In a specific embodiment of this utility model, the pad is fixed to the outward-facing side of the conveyor belt by fasteners at intervals; the fasteners are screws or rivets, and the rivets are blind rivets.

[0011] In another specific embodiment of this utility model, the cross-sectional shape of the beam is I-shaped and the width of the beam is greater than the width of the conveyor belt; the beam support arms are arranged in pairs corresponding to each other along the length of the beam, the upper end of each pair of beam support arms is welded and fixed to the upper part of the beam facing downward, and each lower end is provided with a fastener fixing hole, and the lower end of a pair of beam support arms is fixed to the frame by fasteners at the positions corresponding to the fastener fixing holes.

[0012] In another specific embodiment of this utility model, the pad is a wooden board, a nylon board, or a plastic board.

[0013] In another specific embodiment of this utility model, the conveyor belt is a polyester belt or a nylon belt.

[0014] In another specific embodiment of this utility model, the steel pipe lifting and leading mechanism includes a front receiving tray and a rear receiving tray. The diameters of the front receiving tray and the rear receiving tray are larger than the diameter of the driven wheel. The center position of the front receiving tray is rotatably disposed at the front end of the driven wheel shaft, while the center position of the rear receiving tray is rotatably disposed at the rear end of the driven wheel shaft.

[0015] In a further specific embodiment of this utility model, a front receiving tray pivot bearing is provided at the center of the front receiving tray, and a rear receiving tray pivot bearing is provided at the center of the rear receiving tray. The front end of the driven wheel shaft passes through the front receiving tray pivot bearing and extends to the front side of the front receiving tray, and the rear end of the driven wheel shaft passes through the rear receiving tray pivot bearing and extends to the rear side of the rear receiving tray. The driven wheel is rotatably disposed in the middle of the driven wheel shaft through the driven wheel bearing.

[0016] In a further specific embodiment of this utility model, a locking element mating part is formed at the front end and the rear end of the driven wheel shaft, and a locking element is provided on the locking element mating part. The locking element is a snap ring or a cotter pin. When the locking element is a snap ring, the locking element mating part is a snap ring groove, and when the locking element is a cotter pin, the locking element mating part is a cotter pin hole.

[0017] In yet another specific embodiment of this utility model, the driven wheel axle left and right adjustment mechanism includes a driven wheel axle front axle head adjustment device and a driven wheel axle rear axle head adjustment device. The driven wheel axle front axle head adjustment device is fixed to the left front end of the crossbeam and connected to the front end of the driven wheel axle. The driven wheel axle rear axle head adjustment device is fixed to the left rear end of the crossbeam and connected to the rear end of the driven wheel axle.

[0018] In another specific embodiment of this utility model, the structure of the driven wheel axle rear axle head adjustment device is the same as that of the driven wheel axle front axle head adjustment device. The driven wheel axle front axle head adjustment device includes an adjusting screw seat fixing plate, an adjusting screw seat, and an adjusting screw. The rear right end of the adjusting screw seat fixing plate is welded and fixed to the front left end of the crossbeam. The left end of the adjusting screw seat fixing plate protrudes from the left end of the crossbeam and extends to the left to a degree corresponding to the front of the driven wheel. The adjusting screw seat is fixed to the front middle part of the adjusting screw seat fixing plate. The middle part of the adjusting screw is connected to the adjusting screw seat and locked in the adjusted position by a pair of adjusting screw locking nuts. A bushing is formed at the left end of the adjusting screw, and the bushing is fitted onto the front end of the driven wheel axle. A transmission wheel axle adjustment groove is formed at the left end of the adjusting screw seat fixing plate, and the front end of the driven wheel axle slides in the transmission wheel axle adjustment groove.

[0019] The technical advantages of the present invention are as follows: Because a steel pipe lifting and leading-out mechanism is installed on the driven wheel shaft, when the conveyor belt carrying the seamless steel pipe is turning and changing direction while passing the driven wheel, the seamless steel pipe can be transferred to the steel pipe lifting and leading-out mechanism and guided and lowered by it. This avoids severe friction and impact between the seamless steel pipe and the pad when the conveyor belt turns and changes direction at the driven wheel, preventing premature wear, breakage, deformation, and detachment of the pad. It also effectively protects the service life of the conveyor belt and driven wheel, reduces the workload of equipment maintenance personnel, and saves on equipment maintenance costs. Attached Figure Description

[0020] Figure 1 This is a structural diagram of an embodiment of the present utility model; Figure 2 for Figure 1 The diagram shows a detailed structural diagram of the steel pipe lifting and leading-out mechanism and the driven wheel axle left and right adjustment mechanism.

[0021] In the diagram: 1. Drive shaft; 2. Drive wheel; 3. Driven wheel; 31. Driven wheel shaft; 311. Driven wheel shaft left and right adjustment mechanism; 3111. Driven wheel shaft front axle head adjustment device; 31111. Adjusting screw seat fixing plate; 31112. Adjusting screw seat; 31113. Adjusting screw; 31114. Adjusting screw locking nut; 31115. Bushing; 31116. Drive wheel shaft adjustment groove; 3112. Driven wheel shaft rear axle head adjustment device; 312. Clamping part mating part; 3121. Clamping part; 32. Driven wheel bearing; 4. Conveyor belt; 41. Pad; 411. Fastener; 42. Conveyor belt cavity; 5. Crossbeam; 51. Crossbeam support arm; 511. Fastener fixing hole; 5111. Support arm connecting column; 6. 61. Steel pipe lifting and leading mechanism; 611. Front receiving tray; 62. Rear receiving tray; 621. Rear receiving tray pivot bearing; 7. Seamless steel pipe. Detailed Implementation

[0022] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0023] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on the current position. Figure 1 The location and state are taken as a reference, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0024] Please see Figure 1 The diagram shows a drive shaft 1 driven by a power unit (not shown) and rotatably mounted on a frame in its operational state; drive wheels 2 are shown in a spaced-apart (i.e., fixed) lengthwise along the drive shaft 1 and rotate with the drive shaft 1; driven wheels 3, corresponding to the left side of the drive wheels 2, are shown and rotatably mounted via driven wheel shafts 31, with an equal number to the drive wheels 2; a conveyor belt 4 without end points is shown, with pads 41 fixed at intervals on the outward-facing side, sleeved between each drive wheel 2 and driven wheel 3; and a crossbeam 5 is shown, provided within the conveyor belt cavity 42 corresponding to each conveyor belt 4 and fixed to the frame via a crossbeam support arm 51, wherein the driven wheel shafts 31 are connected to the left end of the crossbeam 5 via a driven wheel shaft left-right adjustment mechanism 311.

[0025] The key technical point of the technical solution provided by this utility model is that it also includes a steel pipe lifting and leading mechanism 6, which is set on the aforementioned driven wheel axle 31. When the aforementioned conveyor belt 4 carries the seamless steel pipe 7 and is in a turning and changing direction position when passing the aforementioned driven wheel 3 (i.e. before turning and changing direction), the aforementioned seamless steel pipe 7 is picked up and dropped by the aforementioned steel pipe lifting and leading mechanism 6.

[0026] from Figure 1 As can be seen from the diagram, before the seamless steel pipe 7, indicated by the dotted line, reaches the area where the driven wheel 3 is located, the conveyor belt 4 is in a horizontal state. When it reaches the driven wheel 3, it turns and changes direction. Thus, the seamless steel pipe 7 on the conveyor belt 4 is transferred to the steel pipe lifting and leading mechanism 6 before the conveyor belt 4 turns and changes direction. It is led out and falls by the steel pipe lifting and leading mechanism 6. The seamless steel pipe 7 does not contact the pad 41 on the conveyor belt 4 at the turning point of the driven wheel 3, thus avoiding friction. This achieves the technical effect recorded by the applicant in the above technical effect column.

[0027] The aforementioned pad 41 is fixed to the outward side of the aforementioned conveyor belt 4 at intervals by fasteners 411; the aforementioned fasteners 411 are screws, but they can also be rivets. If rivets are used, then blind rivets are used.

[0028] Please stay tuned. Figure 1 The cross-sectional shape of the aforementioned beam 5 is I-shaped and the width of the beam 5 is greater than the width of the aforementioned conveyor belt 4; the aforementioned beam support arms 51 are arranged in pairs corresponding to each other along the length of the beam 5, the upper end of each pair of beam support arms 51 is welded and fixed to the upper part of the beam 5 facing downward, and each lower end is provided with a fastener fixing hole 511, and the lower end of the pair of beam support arms 51 is fixed to the aforementioned frame by fasteners at the positions corresponding to the fastener fixing holes 511.

[0029] As a preferred option, a support arm connecting column 5111 can be used to fix the two beam support arms 51 to each other on opposite sides of the middle.

[0030] In this embodiment, the aforementioned pad 41 is a nylon plate, but it can also be a wooden board, a plastic plate, or other equivalent materials.

[0031] The aforementioned conveyor belt 4 is a polyester belt, but it can also be a nylon belt or other equivalent material belt.

[0032] The applicant needs to explain that: Figure 1 Although there are five main and five driven wheels 2 and 3 shown in the diagram, and five conveyor belts 4, this does not mean that the number shown in the diagram is limited.

[0033] Please see Figure 2 And combined Figure 1 The aforementioned steel pipe lifting and leading mechanism 6 includes a front receiving plate 61 and a rear receiving plate 62. The diameters of the front receiving plate 61 and the rear receiving plate 62 are larger than the diameter of the aforementioned driven wheel 3. The center of the front receiving plate 61 is rotatably located at the front end of the aforementioned driven wheel shaft 31, while the center of the rear receiving plate 62 is rotatably located at the rear end of the driven wheel shaft 31.

[0034] A front receiving tray pivot bearing 611 is provided at the center of the aforementioned front receiving tray 61, and a rear receiving tray pivot bearing 621 is provided at the center of the aforementioned rear receiving tray 62. The front end of the aforementioned driven wheel shaft 31 passes through the front receiving tray pivot bearing 611 and extends to the front side of the front receiving tray 61, and the rear end of the aforementioned driven wheel shaft 31 passes through the rear receiving tray pivot bearing 621 and extends to the rear side of the rear receiving tray 62. The aforementioned driven wheel 3 is rotatably disposed in the middle of the driven wheel shaft 31 through the driven wheel bearing 32.

[0035] Depend on Figure 2 As shown, a locking member mating part 312 is formed at the front end and the rear end of the aforementioned driven wheel shaft 31. A locking member 3121 is provided on the locking member mating part 312. The locking member 3121 is either a retaining spring or a cotter pin. When the locking member 3121 is a retaining spring, the locking member mating part 312 is a retaining spring groove, and when the locking member 3121 is a cotter pin, the locking member mating part 312 is a cotter pin hole. In this embodiment, the former is chosen, that is, the locking member mating part 312 is a retaining spring groove, and the locking member 3121 is a retaining spring.

[0036] Please see Figure 2 The aforementioned driven wheel axle left and right adjustment mechanism 311 includes a driven wheel axle front axle head adjustment device 3111 and a driven wheel axle rear axle head adjustment device 3112. The driven wheel axle front axle head adjustment device 3111 is fixed to the front left end of the aforementioned crossbeam 5 and connected to the front end of the aforementioned driven wheel axle 31. The driven wheel axle rear axle head adjustment device 3112 is fixed to the rear left end of the crossbeam 5 and connected to the rear end of the driven wheel axle 31.

[0037] See you later Figure 2Since the structure of the aforementioned driven wheel axle rear axle head adjustment device 3112 is the same as that of the aforementioned driven wheel axle front axle head adjustment device 3111, the applicant will only describe the driven wheel axle front axle head adjustment device 3111 in detail below. The driven wheel axle front axle head adjustment device 3111 includes an adjustment screw seat fixing plate 31111, an adjustment screw seat 31112, and an adjustment screw 31113. The rear right end of the adjustment screw seat fixing plate 31111 is welded and fixed to the front left end of the aforementioned crossbeam 5, while the left end of the adjustment screw seat fixing plate 31111 protrudes from the left end of the crossbeam 5 and extends to the left to meet the front end of the aforementioned driven wheel 3. To the corresponding degree, the adjusting screw seat 31112 is fixed to the front side of the middle part of the adjusting screw seat fixing plate 31111. The middle part of the adjusting screw 31113 is connected to the adjusting screw seat 31112 and locked in the adjusted position by a pair of adjusting screw locking nuts 31114. A bushing 31115 is formed at the left end of the adjusting screw 31113. The bushing 31115 is fitted onto the front end of the aforementioned driven wheel shaft 31. A transmission wheel shaft adjusting groove 31116 is opened at the left end of the aforementioned adjusting screw seat fixing plate 31111. The front end of the aforementioned driven wheel shaft 31 slides in cooperation with the transmission wheel shaft adjusting groove 31116.

[0038] By adjusting the front and rear axle head adjusting devices 3111 and 3112 of the driven wheel axle, the position of the driven wheel axle 31 and the driven wheel 3 can be changed so that the conveyor belt 4 is in the tension required by the process and to avoid passive movement. Below, the applicant briefly describes the adjustment process of the front axle head adjusting device 3111 of the driven wheel axle. First, loosen a pair of adjusting screw locking nuts 31114, and adjust the adjusting screw 31113 to the left or right. During the adjustment of the adjusting screw 31113 to the left or right, its bushing 3115 drives the driven wheel axle 31 to move accordingly to the left or right. After adjustment, the adjusting screw 31113 is locked by a pair of adjusting screw locking nuts 3114.

[0039] Please see Figure 1 With the drive shaft 1 rotating under the power of the aforementioned power unit, the seamless steel pipe 7, introduced onto the conveyor belt 4 from the previous process, moves from right to left as the drive wheel 2 drives the conveyor belt 4. When it reaches the position of the steel pipe lifting and leading-out mechanism 6, the seamless steel pipe 7 is jointly received by the edges of the aforementioned front and rear receiving discs 61 and 62, and falls in a lifted state. During the aforementioned process, the seamless steel pipe 7 no longer contacts the pad 41 located at the turning and redirection point of the driven wheel 3, thus avoiding unwanted friction on the pad 41.

[0040] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A seamless steel pipe conveying and unloading device, comprising a drive shaft (1) driven by a power device and rotatably mounted on a frame in the operating state; drive wheels (2) spaced apart along the length of the drive shaft (1) and rotating with the drive shaft (1); driven wheels (3) rotatably mounted on the left side of the drive wheels (2) via driven wheel shafts (31) and equal in number to the drive wheels (2); a conveyor belt (4) without end points, with pads (41) fixed at intervals on the outward-facing side, sleeved between each drive wheel (2) and driven wheel (3); a crossbeam (5) disposed in the conveyor belt cavity (42) of each conveyor belt (4) and fixed to the frame via a crossbeam support arm (51), wherein the driven wheel shafts (31) are connected to the left end of the crossbeam (5) via a driven wheel shaft left-right adjustment mechanism (311); characterized in that: It also includes a steel pipe lifting and leading mechanism (6), which is installed on the driven wheel axle (31). When the conveyor belt (4) carrying the seamless steel pipe (7) is in a turning position when passing the driven wheel (3), the seamless steel pipe (7) is picked up and dropped by the steel pipe lifting and leading mechanism (6).

2. The seamless steel pipe conveying and unloading device according to claim 1, characterized in that: The pad (41) is fixed to the outward side of the conveyor belt (4) at intervals by fasteners (411); the fasteners (411) are screws or rivets, and the rivets are blind rivets.

3. The seamless steel pipe conveying and unloading device according to claim 1, characterized in that: The cross-section of the beam (5) is I-shaped and the width of the beam (5) is greater than the width of the conveyor belt (4). The beam support arms (51) are arranged in pairs along the length of the beam (5) in a corresponding manner. The upper end of each pair of beam support arms (51) is welded and fixed to the upper part of the beam (5) facing downwards, and each lower end is provided with a fastener fixing hole (511). The lower end of the pair of beam support arms (51) is fixed to the frame by fasteners at the positions corresponding to the fastener fixing holes (511).

4. A seamless steel pipe conveying and unloading device according to claim 1 or 2, characterized in that: The pad (41) is a wooden board, nylon board or plastic board.

5. A seamless steel pipe conveying and unloading device according to claim 1, 2, or 3, characterized in that: The conveyor belt (4) is a polyester belt or a nylon belt.

6. The seamless steel pipe conveying and unloading device according to claim 1, characterized in that: The steel pipe lifting and leading mechanism (6) includes a front receiving tray (61) and a rear receiving tray (62). The diameters of the front receiving tray (61) and the rear receiving tray (62) are larger than the diameter of the driven wheel (3). The center position of the front receiving tray (61) is rotatably located at the front end of the driven wheel shaft (31), while the center position of the rear receiving tray (62) is rotatably located at the rear end of the driven wheel shaft (31).

7. A seamless steel pipe conveying and unloading device according to claim 6, characterized in that: A front receiving tray pivot bearing (611) is provided at the center of the front receiving tray (61), and a rear receiving tray pivot bearing (621) is provided at the center of the rear receiving tray (62). The front end of the driven wheel shaft (31) passes through the front receiving tray pivot bearing (611) and extends to the front side of the front receiving tray (61). The rear end of the driven wheel shaft (31) passes through the rear receiving tray pivot bearing (621) and extends to the rear side of the rear receiving tray (62). The driven wheel (3) is rotatably disposed in the middle of the driven wheel shaft (31) through the driven wheel bearing (32).

8. A seamless steel pipe conveying and unloading device according to claim 7, characterized in that: A locking element mating part (312) is formed at the front end and the rear end of the driven wheel shaft (31). A locking element (3121) is provided on the locking element mating part (312). The locking element (3121) is a snap ring or a cotter pin. When the locking element (3121) is a snap ring, the locking element mating part (312) is a snap ring groove. When the locking element (3121) is a cotter pin, the locking element mating part (312) is a cotter pin hole.

9. A seamless steel pipe conveying and unloading device according to claim 1, characterized in that: The driven wheel axle left and right adjustment mechanism (311) includes a driven wheel axle front axle head adjustment device (3111) and a driven wheel axle rear axle head adjustment device (3112). The driven wheel axle front axle head adjustment device (3111) is fixed to the front left end of the crossbeam (5) and connected to the front end of the driven wheel axle (31). The driven wheel axle rear axle head adjustment device (3112) is fixed to the rear left end of the crossbeam (5) and connected to the rear end of the driven wheel axle (31).

10. A seamless steel pipe conveying and unloading device according to claim 9, characterized in that: The structure of the driven wheel axle rear axle head adjusting device (3112) is the same as that of the driven wheel axle front axle head adjusting device (3111). The driven wheel axle front axle head adjusting device (3111) includes an adjusting screw seat fixing plate (31111), an adjusting screw seat (31112), and an adjusting screw (31113). The rear right end of the adjusting screw seat fixing plate (31111) is welded and fixed to the front left end of the crossbeam (5). The left end of the adjusting screw seat fixing plate (31111) protrudes from the left end of the crossbeam (5) and extends to the left to a degree corresponding to the front side of the driven wheel (3). The adjusting screw seat (31112) The adjusting screw (31113) is fixed to the front side of the middle part of the adjusting screw seat fixing plate (31111). The middle part of the adjusting screw (31113) is connected to the adjusting screw seat (31112) and locked in the adjusted position by a pair of adjusting screw locking nuts (31114). A bushing (31115) is formed at the left end of the adjusting screw (31113). The bushing (31115) is sleeved on the front end of the driven wheel shaft (31). A transmission wheel shaft adjusting groove (31116) is opened at the left end of the adjusting screw seat fixing plate (31111). The front end of the driven wheel shaft (31) slides in cooperation with the transmission wheel shaft adjusting groove (31116).

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