A mid-axle trailer

Abstract

The present invention discloses a mid-axle trailer, including a mid-axle trailer frame, a traction frame, a driving mechanism and a reset member, wherein the traction frame is installed on the mid-axle trailer frame, the reset member includes a third slider sliding on the traction frame, an elastic reset member is installed between the third slider and the traction frame, a second slider sliding on the traction frame, a rotating follower cylinder is installed on both sides of the second slider, the driving mechanism includes an active cylinder and a shell with two recessed grooves, a moving block is installed in the two recessed grooves in a sliding and sealing manner, a clamping rod is installed on the telescopic end of the active cylinder, the two ends of the clamping rod are bent in the same direction, and each recessed groove corresponds to an end of the clamping rod, and the inner cavity of each recessed groove is connected to the follower cylinder through a hydraulic pipe. When the mid-axle trailer swings its tail during being towed, the traction vehicle can assist in returning the mid-axle trailer to the correct position, thereby reducing the harm of the mid-axle trailer swinging its tail.

Description

Technical Field

[0001] The invention relates to the technical field of trailers, in particular to a mid-axle trailer. Background Art

[0002] The mid-axle trailer is mainly composed of a carriage, an axle, and a traction device. The axle of the mid-axle trailer is located in the middle of the vehicle body. When the mid-axle trailer is separated from the traction vehicle, it cannot independently support its own weight and needs to rely on outriggers to stand steadily.

[0003] Since the connection point between the mid-axle trailer and the towing vehicle is below the frame, the movement of the rear mid-axle trailer is relatively flexible. However, when the vehicle speed is too fast or the road is slippery in rainy days, it is easy to swing the tail. In severe cases, it may even cause the whole vehicle to lose control and tilt. The existing technology often uses the method of the driver reducing the speed to avoid the swinging of the mid-axle trailer. Relying on the driver's experience to avoid the swinging cannot rescue the swinging during the process. The swinging still threatens the safety of vehicles and personnel on the road. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a mid-axle trailer. When the mid-axle trailer swings its tail during towing, the towing vehicle can assist in straightening the mid-axle trailer, thereby reducing the harm of the mid-axle trailer swinging its tail, and can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a mid-axle trailer, comprising a mid-axle trailer frame, a traction frame, a driving mechanism and a reset member, wherein the traction frame is installed on the mid-axle trailer frame, and the reset member comprises a third slider sliding on the traction frame, and an elastic reset member is installed between the third slider and the traction frame.

[0006] A sliding second sliding block is installed on the traction frame, and rotating follower hydraulic cylinders are installed on both sides of the second sliding block.

[0007] The driving mechanism includes an active hydraulic cylinder and a shell with two sunken grooves, and moving blocks are installed in the two sunken grooves in a sliding and sealing manner. A clamping rod is installed on the telescopic end of the active hydraulic cylinder, and the two ends of the clamping rod are bent in the same direction. Each sunken groove corresponds to an end of the clamping rod, and the inner cavity of each sunken groove is connected to a follower hydraulic cylinder through a hydraulic pipe.

[0008] As a preferred technical solution of the present invention, a support rod is installed on the shell, a sliding fourth slider is installed on the support rod, and a friction block is installed between the fourth slider and the support rod, a rotating gear is installed on the fourth slider, and each moving block is installed with a rack meshing with the gear, and the gear is located between the two racks.

[0009] As a preferred technical solution of the present invention, a fixing piece is installed on the second slider, a rotating counterweight clamping piece is installed on the fixing piece, an elastic limiting piece is installed between the counterweight clamping piece and the second slider, and a locking tooth adapted to the counterweight clamping piece is provided on the traction frame.

[0010] As a preferred technical solution of the present invention, the elastic reset member includes a screw rod that passes through the third slider and has both ends extending out of the third slider. Two fifth sliders are installed on the traction frame, and the third slider is located between the two fifth sliders. The end of the screw rod passes through the fifth slider and extends outside the fifth slider, and a nut is installed at one end of the screw rod located outside the fifth slider, and an elastic member is installed between the fifth slider and the third slider.

[0011] The third sliding block is rotatably mounted on the rear side of the bottom of the external traction vehicle. When the external traction vehicle brakes, the counterweight clamping piece and the clamping teeth are clamped.

[0012] As a preferred technical solution of the present invention, a fixing frame is fixed on the shell, a sliding rod is installed on the fixing frame, and one end of the sliding rod is connected to the outer side of the moving block.

[0013] As a preferred technical solution of the present invention, a sliding first slider is installed on the traction frame, and the first slider slides on the arc guide rail.

[0014] As a preferred technical solution of the present invention, a fixing frame is installed on the traction frame, a guide hole is opened on the fixing frame, a support rod is installed on the guide hole, a wing plate is installed on the support rod, and a vertical sliding guide is installed on the wing plate.

[0015] During the braking process of the external traction vehicle, the traction frame moves forward compared to the external traction vehicle, the support rod on the wing plate moves downward along the guide hole, and the wing plate provides an upward lift for the traction frame.

[0016] As a preferred technical solution of the present invention, a fixing frame is installed on the traction frame, a guide hole is opened on the fixing frame, a support rod is installed on the guide hole, a wing plate is installed on the support rod, and a vertical sliding guide is installed on the wing plate.

[0017] When the external towing vehicle goes uphill, the towing frame moves backward compared to the external towing vehicle, and the support rod on the wing plate moves downward along the guide hole, and the wing plate provides downward lift for the towing frame.

[0018] As a preferred technical solution of the present invention, the vertical sliding guide member includes a sliding rod, which slides up and down and penetrates the wing plate, and a mounting frame is installed on the upper end of the sliding rod.

[0019] As a preferred technical solution of the present invention, the wing plate is a hollow structure.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The mid-axle trailer of the example of the present invention, on the one hand, the traction frame can rotate horizontally, and the frame of the mid-axle trailer swings its tail during traction, the dynamic cylinder extends and the active cylinder drives the end of the clamping rod to enter the sunken groove, and the end of the clamping rod pushes the moving block to make the depths of the two moving blocks the same, that is, the traction frame is gradually pushed to be parallel to the driving direction of the external traction vehicle, thereby reducing the harm of the mid-axle trailer frame swinging its tail; on the other hand, the traction frame can slide forward and backward, and when emergency braking occurs, the traction frame drives the second slider to move through the counterweight clamping member and the fixing member, and the second slider drives the rack to move in the same direction through the follower cylinder and the moving block, and the fourth slider and the support rod overcome the friction resistance of the friction block and slide relative to each other, thereby achieving buffering during the braking process of the mid-axle trailer frame and improving the maneuverability of the front wheel traction vehicle; on the other hand, the traction frame can slide forward and backward, and during the uphill process, the wing plate separates from the bottom of the external traction vehicle and moves downward, and the wing plate provides a downward force for the traction frame to provide a part of the front weight of the uphill process for the frame of the mid-axle trailer, thereby ensuring the maneuverability of the external traction vehicle.

[0022] 2. In the example of the mid-axle trailer of the present invention, the wing plate is detached from the bottom of the external tractor vehicle and moves downward when going downhill. The air flowing under the external tractor vehicle causes the wing plate to provide an upward lift for the tractor frame, thereby offsetting the forward weight of part of the mid-axle trailer frame during the downhill process, thereby ensuring the maneuverability of the external tractor vehicle during the downhill process.

[0023] 3. In the example of the mid-axle trailer of the present invention, loosen the bolt to make the fifth slider slide along the traction frame, turn the nut to adjust the compression length of the elastic member, tighten the bolt to fix the fifth slider on the traction frame, and when the traction force of the mid-axle trailer frame exceeds a predetermined range, the traction frame moves compared to the third slider, thereby reducing the forward and backward shaking of the mid-axle trailer frame during traction.

[0024] 4. In the example of the mid-axle trailer of the present invention, the friction block increases the friction between the support rod and the fourth slider, hindering the two follower cylinders from extending and retracting at different rates, maintaining the relative position of the second slider on the traction frame, and the second slider can slide along the traction frame when the two follower cylinders extend and retract at the same rate. When the traction frame is pushed to be parallel to the forward direction of the external traction vehicle, the second slider is always located within a certain range on the traction frame, preventing the second slider from getting stuck or falling off the traction frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of one viewing angle of the present invention;

[0026] Figure 2It is a schematic diagram of the local structure of the present invention;

[0027] Figure 3 for Figure 2 A schematic diagram of the structure at A;

[0028] Figure 4 for Figure 2 Another perspective structural diagram of;

[0029] Figure 5 for Figure 4 A schematic diagram of the structure at B;

[0030] Figure 6 for Figure 4 A schematic diagram of the structure at position C of FIG.

[0031] Figure 7 A schematic diagram of the structure of the driving mechanism of the present invention from one perspective;

[0032] Figure 8 It is a schematic structural diagram of the driving mechanism of the present invention from another viewing angle.

[0033] In the figure: 1 a center axle trailer frame, 2 a traction frame, 3 a wing plate, 4 a follower cylinder, 5 a driving mechanism, 51 a housing, 52 a support rod, 53 a fourth slider, 54 a friction block, 55 a gear, 56 a rack, 57 a clamping rod, 58 an active cylinder, 59 a moving block, 6 a mounting frame, 7 a first slider, 8 a reset member, 81 a third slider, 82 a screw rod, 83 an elastic member, 84 a fifth slider, 85 a nut, 9 a sliding rod, 10 an arc guide rail, 11 a second slider, 12 a fixing frame, 13 a guide hole, 14 a supporting rod, 15 a fixing member, 16 a counterweight clamping member, and 17 an elastic limiting member. DETAILED DESCRIPTION

[0034] 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 described embodiments 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.

[0035] Embodiment 1:

[0036] See also Figure 1-8 The present embodiment discloses a mid-axle trailer, comprising a mid-axle trailer frame 1, a traction frame 2, a driving mechanism 5 and a reset member 8, wherein the traction frame 2 is mounted on the mid-axle trailer frame 1, and the reset member 8 comprises a third slider 81 sliding on the traction frame 2, and an elastic reset member is installed between the third slider 81 and the traction frame 2.

[0037] A sliding second slide block 11 is installed on the traction frame 2 , and a rotating follower cylinder 4 is installed on both sides of the second slide block 11 .

[0038] The driving mechanism 5 includes an active hydraulic cylinder 58 and a shell 51 with two recessed grooves. Moving blocks 59 are installed in the two recessed grooves in a sliding and sealing manner. The sliding directions of the two moving blocks 59 are parallel. The recessed grooves are filled with hydraulic oil. A clamping rod 57 is installed on the telescopic end of the active hydraulic cylinder 58. The two ends of the clamping rod 57 are bent in the same direction, and each recessed groove corresponds to a bent end of the clamping rod 57. The inner cavity of each recessed groove is connected to the follower hydraulic cylinder 4 through a hydraulic pipe.

[0039] Preferably, the active hydraulic cylinder 58 and the hydraulic pump on the traction vehicle are connected via an oil pipeline, and the active hydraulic cylinder 58 is installed on the outside of the traction vehicle bottom.

[0040] The follower cylinder 4 and the active cylinder 58 used in the present invention are all common hydraulic mechanisms in the prior art, and their working methods and structures are all well-known technologies, which will not be described in detail here.

[0041] The working process and principle of this embodiment are:

[0042] One end of the follower cylinder 4 away from the second slider 11 is rotatably mounted on the bottom of the external traction vehicle through a rotating pin or a hinged seat. The third slider 81 is mounted on the rear side of the bottom of the external traction vehicle through a bearing or a rotating pin. The third slider 81 can rotate around a vertical axis, and the traction frame 2 can rotate horizontally with the third slider 81. When the traction frame 2 slides compared to the third slider 81, the elastic reset member on the third slider 81 resets the traction frame 2. When the traction frame 2 is pushed to be parallel to the driving direction of the external traction vehicle, the two follower cylinders 4 are extended to the same length, and the depth of the moving blocks 59 in the two sunken grooves is consistent.

[0043] The frame 1 of the mid-axle trailer swings its tail during towing. The frame 1 of the mid-axle trailer drives the traction frame 2 to rotate horizontally. The two follower cylinders 4 are extended to different lengths, resulting in different depths of the moving blocks 59 in the two sunken grooves. The on-board computer controls or manually controls the active cylinder 58 to extend and the active cylinder 58 drives the end of the clamping rod 57 to enter the sunken groove, and the end of the clamping rod 57 pushes the moving block 59 to make the depths of the two moving blocks 59 the same, that is, the traction frame 2 is gradually pushed to be parallel to the driving direction of the external traction vehicle, thereby reducing the harm of the mid-axle trailer frame 1 swinging its tail.

[0044] Preferably, the traction frame 2 is detachably mounted on the mid-axle trailer frame 1 by means of bolts, hooks, buckles or vertically rotating articulated seats. The mid-axle trailer can be quickly separated from an external traction vehicle, thereby shortening loading time and improving transportation efficiency.

[0045] Preferably, a rotatable screw is installed on the second slider 11 and then the screw is rotated to press against the traction frame 2 to fix the second slider 11 and the traction frame 2, or the second slider 11 and the traction frame 2 are welded or bonded together.

[0046] Embodiment 2:

[0047] like Figure 2 , 7 As shown in Figure 8, this embodiment discloses a mid-axle trailer, and its structure is roughly the same as that of the first embodiment, except that, in this embodiment, a support rod 52 is installed on the shell 51, a sliding fourth slider 53 is installed on the support rod 52, and a friction block 54 is installed between the fourth slider 53 and the support rod 52, and the friction block 54 increases the friction force when the fourth slider 53 and the support rod 52 slide relative to each other, and a rotating gear 55 is installed on the fourth slider 53, and each moving block 59 is installed with a rack 56 meshing with the gear 55, and the gear 55 is located between the two racks 56.

[0048] The friction block 54 is a rubber sheet or a brake pad, and the friction block 54 is fixed on the fourth sliding block 53 or the support rod 52 .

[0049] The working process and principle of this embodiment are:

[0050] When the traction frame 2 rotates with the center axle trailer frame 1 , the traction frame 2 drives one of the follower cylinders 4 to extend through the third slider 81 , while the other follower cylinder 4 is squeezed and shortened.

[0051] When the extension and retraction rates of the two follower cylinders 4 are different, resulting in different movement rates of the racks 56 on the two moving blocks 59, the friction block 54 increases the friction between the support rod 52 and the fourth slider 53, preventing the two follower cylinders 4 from extending and retracting at different extension and retraction rates, maintaining the relative position of the second slider 11 on the traction frame 2, and the second slider 11 can slide along the traction frame 2 when the two follower cylinders 4 extend and retract at the same extension and retraction rate. When the traction frame 2 is pushed to be parallel to the forward direction of the external traction vehicle, the second slider 11 is always located within a certain range on the traction frame 2, preventing the second slider 11 from getting stuck or falling off the traction frame 2.

[0052] Embodiment three:

[0053] like Figure 4 and 6As shown, the present embodiment discloses a mid-axle trailer, the structure of which is substantially the same as that of the first embodiment, except that a support rod 52 is mounted on the shell 51 of the present embodiment, a sliding fourth slider 53 is mounted on the support rod 52, a friction block 54 is mounted between the fourth slider 53 and the support rod 52, a rotating gear 55 is mounted on the fourth slider 53, a rack 56 meshing with the gear 55 is mounted on each moving block 59, and the gear 55 is located between the two racks 56.

[0054] A fixing part 15 is installed on the second slider 11, and a rotating counterweight clamping part 16 is installed on the fixing part 15. An elastic limiting part 17 is installed between the counterweight clamping part 16 and the second slider 11. The elastic limiting part 17 is a spring or an elastic rod, and a plurality of teeth adapted to the counterweight clamping part 16 are provided on the traction frame 2.

[0055] The working process and principle of this embodiment are:

[0056] The end of the counterweight clamping piece 16 that is not connected to the fixing piece 15 deviates from the driving direction of the external traction vehicle, and the end of the counterweight clamping piece 16 that is not connected to the fixing piece 15 is close to the traction frame 2. When emergency braking occurs, the mid-axle trailer frame 1 pushes the traction frame 2 forward compared with the external traction vehicle, and the counterweight clamping piece 16 squeezes the elastic limit piece 17 under the action of inertia, and the elastic limit piece 17 is compressed and shortened. The counterweight clamping piece 16 is engaged with the latching teeth on the traction frame 2, and the traction frame 2 drives the second slider 11 to move through the counterweight clamping piece 16 and the fixing piece 15. The second slider 11 moves forward synchronously compared with the external traction vehicle, and the second slider 11 drives the two follower cylinders 4 to extend and retract synchronously, and the racks 56 on the two moving blocks 59 move in the same direction. The fourth slider 53 and the support rod 52 overcome the friction resistance of the friction block 54 and slide relative to each other, thereby achieving buffering during the braking process of the mid-axle trailer frame 1.

[0057] The elastic limiting member 17 with different elastic coefficients can be replaced to adjust the braking force of the external traction vehicle when the counterweight clamping member 16 is clamped with the clamping teeth on the traction frame 2.

[0058] Preferably, an elastic support member is installed between the traction frame 2 and the second slider 11 , and the elastic support member is a spring, a rubber rod, an air bag or a buffer cylinder. The elastic support member prevents the second slider 11 from deviating along the traction frame 2 .

[0059] Embodiment 4:

[0060] like Figure 1-4As shown, the present embodiment discloses a mid-axle trailer, and its structure is substantially the same as that of the third embodiment, except that the elastic reset member of the present embodiment includes a screw rod 82 which penetrates the third slider 81 and extends out of the third slider 81 at both ends, and two fifth sliders 84 are installed on the traction frame 2, the fifth slider 84 slides along the traction frame 2, and the fifth slider 84 is fixed to the traction frame 2 by bolts, and the third slider 81 is located between the two fifth sliders 84, the end of the screw rod 82 penetrates the fifth slider 84 and extends outside the fifth slider 84, and a nut 85 is installed at one end of the screw rod 82 located outside the fifth slider 84, and an elastic member 83 is installed between the fifth slider 84 and the third slider 81, and the elastic member 83 is a spring or an elastic rubber rod.

[0061] Loosen the bolt to make the fifth slider 84 slide along the traction frame 2, turn the nut 85 to adjust the compression length of the elastic member 83, tighten the bolt to fix the fifth slider 84 on the traction frame 2, and when the traction force of the mid-axle trailer frame 1 exceeds a predetermined range, the traction frame 2 moves compared to the third slider 81, thereby reducing the front and rear shaking of the mid-axle trailer frame 1 during traction, thereby ensuring the maneuverability of the external traction vehicle.

[0062] The mid-axle trailer reduces the impact during braking and is suitable for transporting large animals such as cattle, horses, and donkeys. When the mid-axle trailer swings its tail, the mid-axle trailer can be assisted to return to the center, so that the animals can crowd to one side of the carriage to be rescued when the mid-axle trailer swings its tail.

[0063] Embodiment five:

[0064] like Figure 7 and 8 As shown, this embodiment discloses a mid-axle trailer, and its structure is roughly the same as that of the fourth embodiment, except that a fixing frame is fixed on the shell 51 of this embodiment, and a sliding rod is installed on the fixing frame, and one end of the sliding rod is connected to the outer side of the moving block 59. The sliding rod prevents the moving block 59 from tilting and ensures the sealing between the moving block 59 and the recessed groove.

[0065] Embodiment six:

[0066] like Figure 1 , 2 As shown in , 4 and 5, this embodiment discloses a mid-axle trailer. Based on any one of the embodiments from the first to the fifth, a fixing frame 12 is installed on the traction frame 2 of this embodiment, a guide hole 13 is opened on the fixing frame 12, a support rod 14 is installed on the guide hole 13, a wing plate 3 is installed on the support rod 14, and a vertical sliding guide is installed on the wing plate 3.

[0067] When the external tractor vehicle tows the mid-axle trailer frame 1 downhill, the tractor frame 2 moves forward compared to the external tractor vehicle, the support rod 14 on the wing plate 3 moves downward along the guide hole 13, and the air flowing under the external tractor vehicle causes the wing plate 3 to generate an upward lift, and the wing plate 3 provides an upward lift for the tractor frame 2.

[0068] The working process and principle of this embodiment are:

[0069] In the prior art, when a mid-axle vehicle is traveling on a steep slope, the cargo in the vehicle box tilts forward and backward as the slope changes, which will cause an imbalance in the front and rear weights. Since the mid-axle vehicle has only two fulcrums, a fulcrum must be added at the towing point for normal driving. This is also the origin of the 10% front weight design of the mid-axle trailer. However, the 10% front weight can only meet the needs of driving on a relatively flat road section, and cannot meet the needs of driving on a slope. Therefore, in actual use, the weight of the front weight must be increased to ensure the adhesion of the external towing vehicle when going uphill. However, the increase in front weight will increase the front weight of the mid-axle vehicle when going downhill, affecting the controllability of the external towing vehicle, and there is a risk of the external towing vehicle tilting.

[0070] The front weight of the center axle trailer frame 1 is within 7%-12%. When the external tractor tows the center axle trailer frame 1 downhill, the tractor frame 2 and the cargo thereon generate a forward thrust to the external tractor vehicle through the tractor frame 2, and the elastic reset part is deformed under pressure. The tractor frame 2 moves forward compared with the external tractor vehicle, and the support rod 14 on the wing plate 3 moves downward along the guide hole 13, and the wing plate 3 is separated from the bottom of the external tractor vehicle. The air flowing under the external tractor vehicle causes the wing plate 3 to provide an upward lift for the tractor frame 2, offsetting part of the front weight of the center axle trailer frame 1, thereby ensuring the maneuverability of the external tractor vehicle during the downhill process. The large front weight of the center axle trailer frame 1 ensures the maneuverability of the tractor vehicle in the middle during the uphill process.

[0071] Preferably, a sliding first slider 7 is installed on the traction frame 2, and the first slider 7 slides on the arc guide rail 10. The center of the arc guide rail 10 is located on the third slider 81. The arc guide rail 10 is installed on the bottom of the external traction vehicle. The arc guide rail 10 and the first slider 7 provide auxiliary support force for the traction frame 2, thereby improving the safety of the traction frame 2.

[0072] Embodiment seven:

[0073] like Figure 1 , 2 As shown in , 4 and 5 , this embodiment discloses a mid-axle trailer. Based on any one of the embodiments 1 to 5, a sliding first slider 7 is installed on the traction frame 2 of this embodiment, and the first slider 7 slides on the arc guide rail 10.

[0074] A fixing frame 12 is mounted on the traction frame 2 , a guide hole 13 is formed on the fixing frame 12 , a support rod 14 is mounted on the guide hole 13 , a wing plate 3 is mounted on the support rod 14 , and a vertical sliding guide is mounted on the wing plate 3 .

[0075] When the external towing vehicle goes uphill, the towing frame 2 moves backward compared to the external towing vehicle, and the support rod 14 on the wing plate 3 moves downward along the guide hole 13. The air flowing under the external towing vehicle causes the wing plate 3 to generate a downward lift, and the wing plate 3 provides a downward force for the towing frame 2.

[0076] The working process and principle of this embodiment are:

[0077] In the prior art, when a mid-axle vehicle is traveling on a steep slope, the cargo in the vehicle box tilts forward and backward as the slope changes, which will cause an imbalance in the front and rear weights. Since the mid-axle vehicle has only two fulcrums, a fulcrum must be added at the towing point for normal driving. This is also the origin of the 10% front weight design of the mid-axle trailer. However, the 10% front weight can only meet the needs of driving on a relatively flat road section, and cannot meet the needs of driving on a slope. Therefore, in actual use, the weight of the front weight must be increased to ensure the adhesion of the external towing vehicle when going uphill. However, the increase in front weight will increase the front weight of the mid-axle vehicle when going downhill, affecting the controllability of the external towing vehicle, and there is a risk of the external towing vehicle tilting.

[0078] The front weight of the center axle trailer frame 1 is within 2%-7%. When the external traction vehicle tows the center axle trailer frame 1 uphill, the traction frame 2 moves backward compared with the external traction vehicle, and the support rod 14 on the wing plate 3 moves downward along the guide hole 13. The wing plate 3 is separated from the bottom of the external traction vehicle. The wing plate 3 provides a downward force for the traction frame 2 to provide a part of the front weight of the center axle trailer frame 1 during the uphill process, thereby ensuring the maneuverability of the external traction vehicle. The front weight of the center axle trailer frame 1 is low, thereby ensuring the maneuverability of the traction vehicle when going downhill.

[0079] Preferably, a sliding first slider 7 is installed on the traction frame 2, and the first slider 7 slides on the arc guide rail 10, and the center of the arc guide rail 10 is located on the third slider 81. The arc guide rail 10 and the first slider 7 provide auxiliary support force for the traction frame 2, thereby improving the safety of the traction frame 2.

[0080] Embodiment eight:

[0081] like Figure 2 and 4As shown, this embodiment discloses a mid-axle trailer. On the basis of the sixth or seventh embodiment, the vertical sliding guide member of this embodiment includes a slide bar 9, which slides up and down and penetrates the wing plate 3. The upper end of the slide bar 9 is installed with a mounting frame 6, and the mounting frame 6 is installed on the bottom of the external traction vehicle. The slide bar 9 limits the wing plate 3 to move only up and down, and the slide bar 9 enhances the stability of the wing plate 3, and reduces the deflection torque of the support rod 14, thereby reducing the risk of damage to the support rod 14.

[0082] Embodiment nine:

[0083] like Figure 2 and 4 As shown, this embodiment discloses a mid-axle trailer, whose structure is roughly the same as that of the first embodiment, except that the wing panel 3 of this embodiment is a hollow structure, and brake cooling water is contained in the wing panel 3, or maintenance tools, automobile spare parts, food and other sundries are placed in the wing panel 3, thereby improving the universality of the wing panel 3.

[0084] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mid-axle trailer, Features: The invention comprises a mid-axle trailer frame (1), a traction frame (2), a driving mechanism (5) and a reset member (8), wherein the traction frame (2) is mounted on the mid-axle trailer frame (1), the reset member (8) comprises a third sliding block (81) sliding on the traction frame (2), and an elastic reset member is mounted between the third sliding block (81) and the traction frame (2); A sliding second slider (11) is mounted on the traction frame (2), and rotating follower cylinders (4) are mounted on both sides of the second slider (11); The driving mechanism (5) comprises an active hydraulic cylinder (58) and a housing (51) having two recessed grooves, wherein moving blocks (59) are slidably and sealably mounted in the two recessed grooves, a clamping rod (57) is mounted on the telescopic end of the active hydraulic cylinder (58), the two ends of the clamping rod (57) are bent in the same direction, and each recessed groove corresponds to an end of the clamping rod (57), and the inner cavity of each recessed groove is connected to a follower hydraulic cylinder (4) via a hydraulic pipe; A support rod (52) is mounted on the housing (51), a sliding fourth slider (53) is mounted on the support rod (52), a friction block (54) is mounted between the fourth slider (53) and the support rod (52), a rotating gear (55) is mounted on the fourth slider (53), each moving block (59) is mounted with a rack (56) meshing with the gear (55), and the gear (55) is located between two racks (56); A fixing member (15) is mounted on the second sliding block (11), a rotatable counterweight clamping member (16) is mounted on the fixing member (15), an elastic limiting member (17) is mounted between the counterweight clamping member (16) and the second sliding block (11), and a clamping tooth adapted to the counterweight clamping member (16) is provided on the traction frame (2); The elastic reset member comprises a screw rod (82) which passes through the third slider (81) and at both ends of which extend out of the third slider (81); two fifth sliders (84) are mounted on the traction frame (2); the third slider (81) is located between the two fifth sliders (84); an end of the screw rod (82) passes through the fifth slider (84) and extends outside the fifth slider (84); a nut (85) is mounted on one end of the screw rod (82) located outside the fifth slider (84); and an elastic member (83) is mounted between the fifth slider (84) and the third slider (81); The third sliding block (81) is rotatably mounted on the rear side of the bottom of the external traction vehicle, and when the external traction vehicle brakes, the counterweight clamping member (16) is clamped with the clamping teeth.

2. The central axle trailer according to claim 1, Features: A fixing frame is fixed on the housing (51), a sliding rod is mounted on the fixing frame, and one end of the sliding rod is connected to the outer side of the moving block (59).

3. The central axle trailer according to claim 1, Features: A sliding first slide block (7) is mounted on the traction frame (2), and the first slide block (7) slides on the arc-shaped guide rail (10).

4. The central axle trailer according to claim 3, Features: A fixing frame (12) is mounted on the traction frame (2), a guide hole (13) is formed on the fixing frame (12), a support rod (14) is mounted on the guide hole (13), a wing plate (3) is mounted on the support rod (14), and a vertical sliding guide member is mounted on the wing plate (3); During the braking process of the external traction vehicle, the traction frame (2) moves forward relative to the external traction vehicle, the support rod (14) on the wing plate (3) moves downward along the guide hole (13), and the wing plate (3) provides an upward lift for the traction frame (2).

5. The central axle trailer according to claim 3, Features: A fixing frame (12) is mounted on the traction frame (2), a guide hole (13) is formed on the fixing frame (12), a support rod (14) is mounted on the guide hole (13), a wing plate (3) is mounted on the support rod (14), and a vertical sliding guide member is mounted on the wing plate (3); During the uphill movement of the external towing vehicle, the towing frame (2) moves backward relative to the external towing vehicle, the support rod (14) on the wing plate (3) moves downward along the guide hole (13), and the wing plate (3) provides downward lifting force for the towing frame (2).

6. The central axle trailer according to claim 4 or 5, Features: The vertical sliding guide member comprises a sliding rod (9), the sliding rod (9) slides up and down and passes through the wing plate (3), and a mounting frame (6) is mounted on the upper end of the sliding rod (9).

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