Axle steering structure of drum trailer

Abstract

The invention discloses a drum type trailer axle steering structure, and relates to the technical field of drum type trailers, the drum type trailer axle steering structure comprises a bridge frame, a wheel frame is rotatably mounted on the surface of the bridge frame, wheels are rotatably mounted on the surface, away from the bridge frame, of the wheel frame, a first gear is rotatably mounted on the top of the bridge frame, and a first rack is slidably mounted on the top of the bridge frame; a stabilizing device, a protection device and a lubricating device are arranged at the top of the bridge frame, the pressure plate moves to extend towards the wheel frame, impact force generated when the wheel rolls an obstacle is dispersed to more parts of the wheel frame, the situation that force is concentrated at a certain point or a certain area is avoided, and therefore the risk of local deformation and damage is reduced, and the service life of the bridge frame is prolonged. The stability of the overall structure of the wheel carrier is kept, meanwhile, the original shape of the wheel carrier can be maintained, and normal running of wheels and the running performance of a vehicle are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of drum trailers, and specifically to a steering structure for the axle of a drum trailer. Background Art

[0002] The steering structure of the axle of a drum trailer generally refers to the axle steering system of non-powered trailers (such as semi-trailers and full trailers), and its core purpose is to reduce tire wear and improve driving stability when the vehicle is turning.

[0003] The patent with the patent announcement number CN214267277U relates to the technical field of drum trailers. This patent discloses a steering structure for the axle of a drum trailer, which includes a bridge body. Two wheel seats are respectively rotatably installed on both sides of the bridge body. Two brake drums are respectively fixedly installed on the outer sides of the two wheel seats. Two hub discs are respectively rotatably installed on the outer sides of the two brake drums. A steering component is provided on the bridge body. Two shock-absorbing components are respectively provided on both sides of the top of the bridge body. The two shock-absorbing components respectively include two sliding columns. The two sliding columns are respectively fixedly arranged on both sides of the top of the bridge body. Two first sliding cylinders are respectively slidably sleeved on the tops of the two sliding columns. Two first springs are respectively fixedly installed at the bottoms of the two first sliding cylinders. The beneficial effect of this patent is that: the steering component drives the tires installed on the hub discs connected to the brake drums to turn, so as to achieve the purpose of turning during the process of the trailer being pulled and driven. When the trailer touches an obstacle during the driving process, the shock-absorbing component plays a shock-absorbing role for the vehicle.

[0004] In the above patent, the steering component drives the tires installed on the hub discs connected to the brake drums to turn, so as to achieve the purpose of turning during the process of the trailer being pulled and driven. When the trailer touches an obstacle during the driving process, the shock-absorbing component plays a shock-absorbing role for the vehicle. However, it is difficult for the shock-absorbing component to reinforce the steering component when the trailer touches an obstacle, which easily causes the steering component to be damaged by a large force, resulting in an accident for the trailer. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a steering structure for the axle of a drum trailer, which solves the problems raised in the above background art.

[0006] To achieve the above purposes, the present invention is realized through the following technical solutions: A steering structure for the axle of a drum trailer, including a bridge frame, a wheel frame is rotatably installed on the surface of the bridge frame, a wheel is rotatably installed on the side of the wheel frame away from the bridge frame, a first gear is rotatably installed on the top of the bridge frame, a first rack is slidably installed on the top of the bridge frame, and a stabilizing device, a protection device and a lubricating device are provided on the top of the bridge frame;

[0007] Among them, the stabilizing device includes a first elastic telescopic rod, a top plate, a pressing rod, a fixed block, a second elastic telescopic rod, a pressure plate and a first inclined block. The first elastic telescopic rod is fixedly installed on the top of the bridge frame. The top plate is fixedly installed on the top of the movable end of the first elastic telescopic rod. The pressing rod is fixedly installed on the side of the top plate close to the wheel frame. The fixed block is fixedly installed on the top of the bridge frame. The second elastic telescopic rod is fixedly installed on the side of the fixed block close to the wheel frame. The pressure plate is fixedly installed on the movable end of the second elastic telescopic rod. The first inclined block is fixedly installed on the top of the pressure plate. When the bridge frame moves upward and the top plate remains stationary, the pressing rod starts to move downward in the reverse direction, contacts and pushes the first inclined block to start moving. The movement of the first inclined block drives the pressure plate to start moving, and the pressure plate moves and extends towards the wheel frame.

[0008] According to the above technical solution, the surfaces of the pressing rod and the first inclined block that are in contact with each other are both set as inclined surfaces. The pressure plate contacts the wheel frame. By setting the inclined surfaces, it is ensured that the pressing rod can smoothly push the first inclined block when moving, and by the contact, it is ensured that the pressure plate can disperse the pressure.

[0009] According to the above technical solution, the protection device includes a third elastic telescopic rod, a collision prevention rod, a second inclined block and a push rod. The third elastic telescopic rod is fixedly installed inside the bridge frame. The collision prevention rod is fixedly installed on the movable end of the third elastic telescopic rod. The second inclined block is fixedly installed on the side of the collision prevention rod close to the movable end of the third elastic telescopic rod. The push rod is fixedly installed at the bottom of the top plate. When the bridge frame moves upward and the top plate remains stationary, the reverse movement of the top plate drives the push rod to start moving downward. The movement of the push rod contacts and pushes the second inclined block to start moving. The movement of the second inclined block drives the collision prevention rod to start moving, and the collision prevention rod moves and extends outwards.

[0010] According to the above technical solution, the protection device further includes a sliding column, a protection plate, a third inclined block and a flat rod. The sliding column is slidably installed at the bottom of the bridge frame. The protection plate is fixedly installed at the bottom of the sliding column. The third inclined block is fixedly installed on the top of the protection plate. The flat rod is fixedly installed on the side of the collision prevention rod close to the bridge frame. When the collision prevention rod moves and extends outwards, it drives the flat rod to start moving. The movement of the flat rod contacts and pushes the third inclined block to start moving downward. The movement of the third inclined block drives the protection plate to start moving downward. The movement of the protection plate can prevent obstacles from directly contacting the bottom of the vehicle frame.

[0011] According to the above technical solution, the surfaces of the push rod and the second inclined block that are in contact with each other are both set as inclined surfaces. The surfaces of the flat rod and the third inclined block that are in contact with each other are both set as inclined surfaces. A spring is provided between the protection plate and the bridge frame. By setting the inclined surfaces, it is ensured that the push rod can smoothly push the second inclined block when moving, by setting the inclined surfaces, it is ensured that the flat rod can smoothly push the third inclined block when moving, and by setting the spring, it is ensured that the protection plate can smoothly achieve self-reset.

[0012] According to the above technical solution, the lubrication device includes an oil tank, an oil pipe, a second rack, a valve, a valve switch, and a second gear. The oil tank is fixedly installed at one end of the bridge frame close to the wheel carrier. The oil pipe is fixedly installed at the bottom of the oil tank. The second rack is fixedly installed at one end of the guard plate close to the wheel carrier. The valve is fixedly installed on the circumferential surface of the oil pipe. The valve switch is fixedly installed at the control end of the valve. The second gear is fixedly installed on the circumferential surface of the valve switch. When the guard plate moves downward, it drives the second rack to start moving downward. The movement of the second rack drives the second gear to start rotating. The rotation of the second gear drives the valve switch to rotate, and the rotation of the valve switch opens the valve.

[0013] According to the above technical solution, the lubrication device further includes an inlet pipe and a cross valve. The inlet pipe is fixedly installed on the circumferential surface of the oil tank. The cross valve is fixedly installed inside the inlet pipe. After the lubricating oil inside the oil tank is used up, professional staff can add the lubricating oil into the oil tank through the inlet pipe by opening the cross valve under the condition of ensuring safety.

[0014] According to the above technical solution, the second rack meshes with the second gear, and the oil pipe extends deep into the bridge frame. By meshing, it is ensured that the second rack can drive the second gear to rotate when moving. By extending deep into the bridge frame, it is ensured that the lubricating oil can lubricate key components.

[0015] The present invention provides a steering structure for a drum trailer axle. It has the following beneficial effects:

[0016] (1) In this invention, by keeping the movable end of the first elastic telescopic rod and the top plate stationary, it can effectively absorb and buffer vibrations, reduce the direct transmission of vibrations to the trailer body, protect the goods from damage, and at the same time can effectively reduce the hardness of the suspension system and the vibration degree of the vehicle body, thereby improving the driving smoothness and comfort, and reducing the fatigue of the driver caused by excessive vibrations.

[0017] (2) In this invention, by the pressure plate moving and extending towards the wheel carrier direction, the impact force generated when the wheel rolls over an obstacle is dispersed to more parts of the wheel carrier, avoiding the concentration of force at a certain point or area, thereby reducing the risk of local deformation and damage, maintaining the overall structural stability of the wheel carrier, and at the same time helping to maintain the original shape of the wheel carrier, ensuring the normal operation of the wheels and the driving performance of the vehicle.

[0018] (3) In this invention, after the anti-collision bar extends out and may come into contact with an obstacle, it can play a buffering role between the wheel and the obstacle, absorb and disperse part of the collision energy, reduce the impact force transmitted to vehicle components such as the wheel, axle, and frame, thereby reducing the risk of damage to these components due to collision, extending the service life of the vehicle. By the movement of the guard plate, it can prevent the obstacle from directly contacting the bottom of the frame, avoid the frame from being scratched and collided by sharp obstacles, resulting in deformation and damage, maintain the integrity and structural strength of the frame, extend the service life of the frame, and at the same time prevent important components from being impacted and scratched by obstacles, avoiding mechanical failures of the vehicle caused by component damage.

[0019] (4) In this invention, by rotating the valve switch to open the valve, then the lubricating oil flows out from the inside of the oil tank through the oil pipe to lubricate the steering device. The lubricating oil can form an oil film on the contact surface between the components of the steering device, changing the friction between them from dry friction to liquid friction, thereby greatly reducing the friction coefficient, reducing component wear, and extending the service life of the steering device. At the same time, the lubricating oil can absorb and carry away part of the heat, playing a cooling role, preventing the steering device from malfunctioning due to overheating, and ensuring its operation within the normal working temperature range.

[0020] (5) In this invention, by opening the cross valve, the lubricating oil is added into the oil tank through the oil inlet pipe, preventing direct contact between components due to lack of oil, reducing wear, and extending the service life of the components. At the same time, the newly added lubricating oil can continue to effectively absorb and dissipate the heat generated during the operation of the steering device, preventing problems such as deformation and damage of the components due to overheating, and maintaining the normal performance of the steering device. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a schematic diagram of the structure of the wheel frame and the bridge frame of the present invention;

[0023] Figure 3 is a schematic cross-sectional view of the structure of the stabilizing device of the present invention;

[0024] Figure 4 is a schematic cross-sectional view of the structure of the protection device of the present invention;

[0025] Figure 5 is a schematic cross-sectional view of the structure of the sliding column and the guard plate of the present invention;

[0026] Figure 6 is a schematic cross-sectional view of the structure of the lubrication device of the present invention;

[0027] Figure 7 is the present invention Figure 6 Schematic enlarged view of the structure of part A in.

[0028] In the figure: 1, bridge frame; 2, wheel frame; 3, wheel; 4, gear one; 5, rack one; 6, elastic telescopic rod one; 7, top plate; 8, pressure rod; 9, fixed block; 10, elastic telescopic rod two; 11, pressure plate; 12, inclined block one; 131, elastic telescopic rod three; 132, anti-collision rod; 133, inclined block two; 134, push rod; 135, sliding column; 136, guard plate; 137, inclined block three; 138, flat rod; 141, oil tank; 142, oil pipe; 143, rack two; 144, valve; 145, valve switch; 146, gear two; 147, inlet oil pipe; 148, cross valve. Specific implementation manner

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the 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.

[0030] Please refer to Figures 1 - 7 , an embodiment of the present invention is: a drum trailer axle steering structure, including a bridge frame 1, a wheel frame 2 is rotatably installed on the surface of the bridge frame 1, a wheel 3 is rotatably installed on one side of the wheel frame 2 away from the bridge frame 1, a gear one 4 is rotatably installed on the top of the bridge frame 1, a rack one 5 is slidably installed on the top of the bridge frame 1, and a stabilizing device is arranged on the top of the bridge frame 1;

[0031] Among them, the stabilizing device includes an elastic telescopic rod one 6, a top plate 7, a pressure rod 8, a fixed block 9, an elastic telescopic rod two 10, a pressure plate 11 and an inclined block one 12. The elastic telescopic rod one 6 is fixedly installed on the top of the bridge frame 1, the top plate 7 is fixedly installed on the top of the movable end of the elastic telescopic rod one 6, the pressure rod 8 is fixedly installed on the side of the top plate 7 close to the wheel frame 2, the fixed block 9 is fixedly installed on the top of the bridge frame 1, the elastic telescopic rod two 10 is fixedly installed on the side of the fixed block 9 close to the wheel frame 2, the pressure plate 11 is fixedly installed on the movable end of the elastic telescopic rod two 10, and the inclined block one 12 is fixedly installed on the top of the pressure plate 11. By moving the pressure plate 11 and extending towards the wheel frame 2, the impact force generated when the wheel 3 rolls over an obstacle is dispersed to more parts of the wheel frame 2, avoiding the concentration of force at a certain point or area, thereby reducing the risk of local deformation and damage, maintaining the stability of the overall structure of the wheel frame 2, and at the same time helping to maintain the original shape of the wheel frame 2, ensuring the normal operation of the wheel 3 and the driving performance of the vehicle.

[0032] The surfaces of the pressure rod 8 and the inclined block one 12 in contact with each other are both set as inclined surfaces. The pressure plate 11 is in contact with the wheel frame 2. By setting the inclined surfaces, it is ensured that the pressure rod 8 can smoothly push the inclined block one 12 when moving, and by the contact, it is ensured that the pressure plate 11 can disperse the pressure.

[0033] During the operation of this embodiment: First, when the trailer is moving, the driver rotates the first gear 4 to drive the first rack 5 to start moving. The movement of the first rack 5 pushes the wheel carrier 2 to start rotating, and the rotation of the wheel carrier 2 drives the wheel 3 to rotate. When the wheel 3 runs over an obstacle during the movement of the trailer, it will move upward along the obstacle. The movement of the wheel 3 drives the wheel carrier 2 to move upward, and the movement of the wheel carrier 2 drives the bridge frame 1 to move upward. At this time, the fixed end of the first elastic telescopic rod 6 moves upward, and the movable end of the first elastic telescopic rod 6 and the top plate 7 remain stationary, which can effectively absorb and buffer vibrations, reduce the direct transmission of vibrations to the trailer body, protect the goods from damage, and at the same time can effectively reduce the hardness of the suspension system and the vibration degree of the body, thereby improving the driving smoothness and comfort, and reducing the fatigue of the driver caused by excessive vibrations. When the bridge frame 1 moves upward and the top plate 7 remains stationary, the pressure rod 8 starts to move downward in the reverse direction to contact and push the first inclined block 12 to start moving. The movement of the first inclined block 12 drives the pressure plate 11 to start moving, and the pressure plate 11 moves and extends towards the wheel carrier 2, dispersing the impact force generated when the wheel 3 runs over the obstacle to more parts of the wheel carrier 2, avoiding the concentration of force at a certain point or area, thereby reducing the risk of local deformation and damage, maintaining the stability of the overall structure of the wheel carrier 2, and at the same time helping to maintain the original shape of the wheel carrier 2 to ensure the normal operation of the wheel 3 and the driving performance of the vehicle.

[0034] Please refer to Figures 1 - 7 , on the basis of the above embodiment, in another embodiment of the present invention, a protective device and a lubricating device are provided on the top of the bridge frame 1.

[0035] The protective device includes a third elastic telescopic rod 131, an anti-collision rod 132, a second inclined block 133, and a push rod 134. The third elastic telescopic rod 131 is fixedly installed inside the bridge frame 1, the anti-collision rod 132 is fixedly installed at the movable end of the third elastic telescopic rod 131, the second inclined block 133 is fixedly installed on the surface of the anti-collision rod 132 close to the movable end of the third elastic telescopic rod 131, and the push rod 134 is fixedly installed at the bottom of the top plate 7. After the anti-collision rod 132 extends out, it may come into contact with an obstacle and can play a buffering role between the wheel 3 and the obstacle, absorbing and dispersing part of the collision energy, reducing the impact force transmitted to vehicle components such as the wheel 3, the axle, and the vehicle frame, thereby reducing the risk of damage to these components due to collision and extending the service life of the vehicle.

[0036] The protection device further includes a sliding column 135, a guard plate 136, an inclined block three 137 and a flat bar 138. The sliding column 135 is slidably installed at the bottom of the bridge frame 1. The guard plate 136 is fixedly installed at the bottom of the sliding column 135. The inclined block three 137 is fixedly installed at the top of the guard plate 136. The flat bar 138 is fixedly installed on the side of the anti-collision bar 132 close to the bridge frame 1. By moving the guard plate 136, it can prevent obstacles from directly contacting the bottom of the vehicle frame, avoiding the vehicle frame from being scratched and collided by sharp obstacles, resulting in deformation and damage, maintaining the integrity and structural strength of the vehicle frame, extending the service life of the vehicle frame, and at the same time preventing important components from being impacted and scratched by obstacles, avoiding mechanical failures of the vehicle caused by component damage.

[0037] The surfaces of the push rod 134 and the inclined block two 133 in contact with each other are both set as inclined surfaces. The surfaces of the flat bar 138 and the inclined block three 137 in contact with each other are both set as inclined surfaces. A spring is provided between the guard plate 136 and the bridge frame 1. By setting the inclined surfaces, it is ensured that the push rod 134 can smoothly push the inclined block two 133 when moving. By setting the inclined surfaces, it is ensured that the flat bar 138 can smoothly push the inclined block three 137 when moving. By setting the spring, it is ensured that the guard plate 136 can smoothly achieve self-reset.

[0038] The lubrication device includes an oil tank 141, an oil pipe 142, a rack two 143, a valve 144, a valve switch 145 and a gear two 146. The oil tank 141 is fixedly installed at one end of the bridge frame 1 close to the wheel frame 2. The oil pipe 142 is fixedly installed at the bottom of the oil tank 141. The rack two 143 is fixedly installed at one end of the guard plate 136 close to the wheel frame 2. The valve 144 is fixedly installed on the circumferential surface of the oil pipe 142. The valve switch 145 is fixedly installed at the control end of the valve 144. The gear two 146 is fixedly installed on the circumferential surface of the valve switch 145. By rotating the valve switch 145, the valve 144 is opened. Subsequently, the lubricating oil flows out from the inside of the oil tank 141 through the oil pipe 142 to lubricate the steering device. The lubricating oil can form an oil film on the contact surfaces between the components of the steering device, changing the friction between them from dry friction to liquid friction, thereby greatly reducing the friction coefficient, reducing the wear of the components, and extending the service life of the steering device. At the same time, the lubricating oil can absorb and carry away part of the heat, playing a cooling role, preventing the steering device from malfunctioning due to overheating, and ensuring its operation within the normal working temperature range.

[0039] The lubrication device further includes an oil inlet pipe 147 and a cross valve 148. The oil inlet pipe 147 is fixedly installed on the circumferential surface of the oil tank 141, and the cross valve 148 is fixedly installed inside the oil inlet pipe 147. By opening the cross valve 148, lubricating oil is added into the oil tank 141 through the oil inlet pipe 147, preventing direct contact between components due to lack of oil, reducing wear, and extending the service life of the components. At the same time, the newly added lubricating oil can continue to effectively absorb and dissipate the heat generated during the operation of the steering device, preventing problems such as deformation and damage of the components due to overheating, and maintaining the normal performance of the steering device.

[0040] The second rack 143 meshes with the second gear 146, and the oil pipe 142 extends deep into the bridge frame 1. By meshing, it is ensured that the second rack 143 can drive the second gear 146 to rotate when moving, and by extending deep into the bridge frame 1, it is ensured that the lubricating oil can lubricate the key components.

[0041] During the operation of this embodiment: when the bridge frame 1 moves upward and the top plate 7 remains stationary, the top plate 7 moves in the reverse direction and drives the push rod 134 to start moving downward. The push rod 134 moves and contacts and pushes the second inclined block 133 to start moving. The second inclined block 133 moves and drives the anti-collision rod 132 to start moving. The anti-collision rod 132 moves and extends outwards. After the anti-collision rod 132 extends out, it may contact an obstacle and can play a buffering role between the wheel 3 and the obstacle, absorbing and dispersing part of the collision energy, reducing the impact force transmitted to vehicle components such as the wheel 3, axle, and vehicle frame, thereby reducing the risk of damage to these components due to collision and extending the service life of the vehicle. While the anti-collision rod 132 moves and extends outwards, it drives the flat rod 138 to start moving. The flat rod 138 moves and contacts and pushes the third inclined block 137 to start moving downward. The third inclined block 137 moves and drives the guard plate 136 to start moving downward. The movement of the guard plate 136 can prevent the obstacle from directly contacting the bottom of the vehicle frame, avoiding deformation and damage of the vehicle frame caused by scratching and collision with sharp obstacles, maintaining the integrity and structural strength of the vehicle frame, extending the service life of the vehicle frame, and at the same time preventing important components from being impacted and scratched by obstacles, avoiding mechanical failures of the vehicle due to component damage.

[0042] While the guard plate 136 moves downward, it drives the second rack 143 to start moving downward. The movement of the second rack 143 drives the second gear 146 to start rotating. The rotation of the second gear 146 drives the valve switch 145 to rotate. The rotation of the valve switch 145 opens the valve 144. Subsequently, the lubricating oil flows out from the inside of the oil tank 141 through the oil pipe 142 to lubricate the steering device. The lubricating oil can form an oil film on the contact surfaces between the components of the steering device, changing the friction between them from dry friction to liquid friction, thereby greatly reducing the friction coefficient, reducing the wear of the components, and extending the service life of the steering device. At the same time, the lubricating oil can absorb and carry away part of the heat, playing a cooling role to prevent the steering device from malfunctioning due to overheating and ensuring its operation within the normal working temperature range. After the lubricating oil inside the oil tank 141 is used up, professional staff, under the condition of ensuring safety, add the lubricating oil into the oil tank 141 through the inlet pipe 147 by opening the cross valve 148 to prevent direct contact between components due to lack of oil, reduce wear, and extend the service life of the components. At the same time, the newly added lubricating oil can continue to effectively absorb and dissipate the heat generated during the operation of the steering device, preventing problems such as deformation and damage of the components due to overheating and maintaining the normal performance of the steering device.

[0043] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drum-type trailer axle steering structure, comprising a bridge frame (1), characterized in that: A wheel carrier (2) is rotatably installed on the surface of the bridge frame (1). A wheel (3) is rotatably installed on one side of the wheel carrier (2) away from the bridge frame (1). A first gear (4) is rotatably installed on the top of the bridge frame (1). A first rack (5) is slidably installed on the top of the bridge frame (1). A stabilizing device, a protective device and a lubricating device are arranged on the top of the bridge frame (1); Among them, the stabilizing device includes a first elastic telescopic rod (6), a top plate (7), a pressure rod (8), a fixing block (9), a second elastic telescopic rod (10), a pressure plate (11) and a first inclined block (12). The first elastic telescopic rod (6) is fixedly installed on the top of the bridge frame (1). The top plate (7) is fixedly installed on the top of the movable end of the first elastic telescopic rod (6). The pressure rod (8) is fixedly installed on the side of the top plate (7) close to the wheel carrier (2). The fixing block (9) is fixedly installed on the top of the bridge frame (1). The second elastic telescopic rod (10) is fixedly installed on the side of the fixing block (9) close to the wheel carrier (2). The pressure plate (11) is fixedly installed on the movable end of the second elastic telescopic rod (10). The first inclined block (12) is fixedly installed on the top of the pressure plate (11).

2. The drum-type trailer axle steering structure according to claim 1, wherein: The surfaces of the pressure rod (8) and the first inclined block (12) in contact with each other are both set as inclined surfaces. The pressure plate (11) is in contact with the wheel carrier (2).

3. The drum-type trailer axle steering structure according to claim 2, wherein: The protective device includes a third elastic telescopic rod (131), a collision-proof rod (132), a second inclined block (133) and a push rod (134). The third elastic telescopic rod (131) is fixedly installed inside the bridge frame (1). The collision-proof rod (132) is fixedly installed on the movable end of the third elastic telescopic rod (131). The second inclined block (133) is fixedly installed on the side of the collision-proof rod (132) close to the movable end of the third elastic telescopic rod (131). The push rod (134) is fixedly installed at the bottom of the top plate (7).

4. A drum-type trailer axle steering structure according to claim 3, characterized in that: The protective device further includes a sliding column (135), a protective plate (136), a third inclined block (137) and a flat rod (138). The sliding column (135) is slidably installed at the bottom of the bridge frame (1). The protective plate (136) is fixedly installed at the bottom of the sliding column (135). The third inclined block (137) is fixedly installed on the top of the protective plate (136). The flat rod (138) is fixedly installed on the side of the collision-proof rod (132) close to the bridge frame (1).

5. A drum-type trailer axle steering structure according to claim 4, characterized in that: The surfaces of the push rod (134) and the second inclined block (133) in contact with each other are both set as inclined surfaces. The surfaces of the flat rod (138) and the third inclined block (137) in contact with each other are both set as inclined surfaces. A spring is arranged between the protective plate (136) and the bridge frame (1).

6. The drum-type trailer axle steering structure according to claim 5, characterized in that: The lubrication device includes an oil tank (141), an oil pipe (142), a second rack (143), a valve (144), a valve switch (145) and a second gear (146). The oil tank (141) is fixedly installed at one end of the bridge frame (1) close to the wheel frame (2). The oil pipe (142) is fixedly installed at the bottom of the oil tank (141). The second rack (143) is fixedly installed at one end of the guard plate (136) close to the wheel frame (2). The valve (144) is fixedly installed on the circumferential surface of the oil pipe (142). The valve switch (145) is fixedly installed at the control end of the valve (144). The second gear (146) is fixedly installed on the circumferential surface of the valve switch (145).

7. A drum-type trailer axle steering structure according to claim 6, characterized in that: The lubrication device further includes an inlet oil pipe (147) and a cross valve (148). The inlet oil pipe (147) is fixedly installed on the circumferential surface of the oil tank (141). The cross valve (148) is fixedly installed inside the inlet oil pipe (147).

8. The drum-type trailer axle steering structure according to claim 7, wherein: The second rack (143) meshes with the second gear (146), and the oil pipe (142) extends deep into the bridge frame (1).

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