Automatic leveling trailer

Abstract

The present invention relates to the field of trailers, and in particular to an automatic leveling trailer, including a chassis and a car body, a hydraulic jack is arranged inside the chassis, the output end of the hydraulic jack is rotatably connected to the bottom of the car body, one end of the car body is rotatably matched with the chassis, a bracket is arranged at the front end of the chassis, lifting mechanisms are symmetrically arranged on both sides of the chassis, a balancing bracket is fixedly arranged inside the chassis, a pre-balancing mechanism is arranged at the bottom of the balancing bracket, fixed brackets are arranged on both sides of the pre-balancing mechanism, and the fixed brackets are fixedly connected to the chassis. The present invention can realize the pre-balancing of the gravity on both sides by utilizing the sliding process of the balancing counterweight block in the opposite direction of the tilting direction of the car body, and can effectively slow down the tilting trend of the car body, and at the same time, by utilizing the sliding cooperation between the sliding pin and the inclined slide groove, the lifting plate is pushed upward to lift the car body, thereby providing support for the car body to realize gravity leveling.

Description

Technical Field

[0001] The invention relates to the technical field of trailers, and in particular to an automatic leveling trailer. Background Art

[0002] Trailers are vehicles that are towed by cars (trucks, tractors, forklifts, etc.) but have no power drive devices themselves. They are important types of vehicles for road transportation. Trailers are mainly divided into full trailers, semi-trailers and center-axle trailers according to the way they are connected to the tractor. Their diverse models and wide range of applications make trailers an indispensable part of the modern transportation system.

[0003] At present, when a trailer is fully loaded with goods, the center of gravity will be high. Due to the inertia of the goods and the bumpy road conditions, when the trailer passes a curve at high speed, the center of gravity of the goods will shift to the inside of the curve, causing the car body to tilt relative to the chassis or even overturn, posing a huge safety hazard. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic leveling trailer, aiming to solve the above technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An automatic leveling trailer comprises a chassis and a carriage, wherein a hydraulic jack is arranged inside the chassis, an output end of the hydraulic jack is rotatably connected to the bottom of the carriage, one end of the carriage is rotatably matched with the chassis, a bracket is arranged at the front end of the chassis, lifting mechanisms are symmetrically arranged on both sides of the chassis, a balancing bracket is fixedly arranged inside the chassis, a pre-balancing mechanism is arranged at the bottom of the balancing bracket, fixed brackets are arranged on both sides of the pre-balancing mechanism, and the fixed brackets are fixedly connected to the chassis.

[0007] The balancing bracket includes a pair of cross beams and a pair of longitudinal beams, a pressure plate is arranged at the upper end of the longitudinal beam, a buffer spring is arranged between the bottom of the pressure plate and the longitudinal beam, pressure rods are fixedly arranged at both ends of the bottom of the pressure plate, and contact switches are arranged at both ends of the fixed bracket. The pressure rod passes through the longitudinal beam and is respectively opposite to the contact switches at both ends of the fixed bracket. The contact switch is electrically connected to the lifting mechanism and is used to control the opening and closing of the lifting mechanism.

[0008] The pre-balancing mechanism includes a shell, both ends of the shell are fixedly connected to the chassis, transmission components are arranged on both sides of the shell, a winding shaft is passed through the shell, the transmission components are respectively cooperated with the pressure rod and the winding shaft for transmission, both ends of the winding shaft are rotatably connected to the shell through a torsion spring, a slideway is arranged at the bottom of the shell, a sliding rod is fixedly arranged in the slideway along the length direction, a balancing weight is slidably installed on the sliding rod, wire rollers are rotatably installed at the four corners of the shell, a pull rope is wound around the winding shaft, and both ends of the pull rope are respectively fixedly connected to both ends of the balancing weight after passing around the wire roller.

[0009] As a further solution of the present invention: the transmission assembly includes a pair of transmission shafts and a pair of transverse tooth plates, a fixed plate is fixedly arranged in the shell, the transmission shaft is rotatably penetrated and installed at both ends of the fixed plate, large circle gears and small circle gears are sleeved on both ends of the transmission shaft, a longitudinal tooth groove is arranged on one side of the pressure rod, transverse tooth grooves are arranged on the upper and lower ends of the transverse tooth plate, the large circle gear is meshed with the longitudinal tooth groove, the small circle gear is meshed with the transverse tooth groove at the lower end of the transverse tooth plate, and synchronous gears are sleeved on both ends of the winding shaft, and the synchronous gears are meshed with the transverse tooth groove on the upper end of the transverse tooth plate.

[0010] As a further solution of the present invention: fixed seats are extended at both ends of the shell, push rods are fixedly provided at both ends of the transverse tooth plate, the push rods slide through the corresponding fixed seats, and return springs are provided between the two ends of the transverse tooth plate and the fixed seats.

[0011] As a further solution of the present invention: the winding direction of the pull rope on the winding shaft is clockwise.

[0012] As a further solution of the present invention: the lifting mechanism includes a base plate, which is fixedly connected to the chassis, a lifting plate is arranged above the base plate, guide rods are fixedly connected to the four corners of the bottom of the lifting plate, the guide rods slide through the base plate, side plates are fixedly arranged on both sides of the bottom of the lifting plate, and inclined sliding grooves are symmetrically arranged on the side plates.

[0013] As a further solution of the present invention: push-pull cylinders are fixedly provided at both ends of the base plate, the contact switches at both ends of the fixed bracket are electrically connected to the corresponding push-pull cylinders respectively, the output end of the push-pull cylinder is fixedly connected to a sliding seat, a slide rail is provided at the upper end of the base plate, the sliding seat is adapted to be slidably installed on the slide rail, the sliding seat is located between the side plates on both sides, sliding pins are rotatably installed on both sides of the sliding seat, and the sliding pins are adapted to be slidably installed in the inclined slide groove.

[0014] Beneficial effects of the present invention:

[0015] (1) By setting up a pre-balancing mechanism, when the car body tilts to the right, the pressure plate on the right side will press the pressure rod downward. During the downward movement of the pressure rod, the winding shaft will drive the winding shaft to rotate counterclockwise through the transmission assembly. Since the pull rope is wound around the winding shaft clockwise, the winding shaft will drive the left end of the pull rope to be wound up and the right end of the pull rope to be unwound when it rotates counterclockwise. During the process of winding and unwinding, the pull rope will pull the balancing weight block to slide to the left along the sliding rod, so that the balancing weight block sliding to the left can be used to pre-balance the gravity of the right-leaning car body. When the car body tilts to the left, the winding shaft will rotate clockwise and pull the balancing weight block to slide to the right along the sliding rod, that is, the gravity of the left-leaning car body can be balanced. Therefore, the sliding process of the balancing weight block in the opposite direction of the tilting direction of the car body can be used to achieve pre-balancing of the gravity on both sides, which can effectively slow down the tilting trend of the car body.

[0016] (2) By setting up a lifting mechanism, when the car body tilts severely to one side, the pressure plate on that side will drive the pressure rod to move downward until the bottom of the pressure rod touches and triggers the contact switch, thereby causing the push-pull cylinders at both ends of the same side to start running. The push-pull cylinders will push the sliding seat horizontally to slide along the slide rail, and the sliding pin will always keep sliding in the inclined slide groove. The sliding cooperation between the sliding pin and the inclined slide groove will push the lifting plate upward to lift the car body, thereby providing support for the car body to achieve gravity leveling. In addition, power is provided at both ends of the bottom of the lifting plate, and the force is uniform, so that the lifting support process can maintain balance and stability, which is beneficial to suppressing the tilting trend of the car body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the chassis in the present invention.

[0020] Figure 3 It is a structural schematic diagram of the balancing bracket in the present invention.

[0021] Figure 4 It is a structural schematic diagram of the pressure plate in the present invention.

[0022] Figure 5 It is a structural schematic diagram of the pre-balancing mechanism in the present invention.

[0023] Figure 6 It is a schematic diagram of the internal structure of the shell in the present invention.

[0024] Figure 7 It is a structural schematic diagram of the winding shaft in the present invention.

[0025] Figure 8It is a bottom view schematic diagram of the chassis in the present invention.

[0026] Fig. 9 yes Figure 8 Schematic diagram of the enlarged structure at point A in the middle.

[0027] Fig.10 It is a structural schematic diagram of the lifting mechanism in the present invention.

[0028] Fig.11 It is a structural schematic diagram of the sliding seat in the present invention.

[0029] In the figure: 1, chassis; 2, carriage; 3, hydraulic jack; 4, bracket; 5, lifting mechanism; 501, bottom plate; 502, guide rod; 503, lifting plate; 504, side plate; 505, inclined slide; 506, push-pull cylinder; 507, sliding seat; 508, sliding pin; 509, slide rail; 6, balance bracket; 601, crossbeam; 602, longitudinal beam; 603, pressure plate; 604, buffer spring; 605, pressure rod; 606, longitudinal tooth groove; 7, pre-leveling Weighing mechanism; 701, housing; 702, fixing plate; 703, transmission shaft; 704, large circle gear; 705, small circle gear; 706, horizontal tooth plate; 707, push rod; 708, return spring; 709, fixing seat; 710, winding shaft; 711, synchronous gear; 712, slideway; 713, slide bar; 714, balancing weight; 715, wire roller; 716, pull rope; 717, torsion spring; 8, fixing bracket; 801, contact switch. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the 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.

[0031] See also Figure 1 , Figure 2 and Figure 3 As shown, the present invention is an automatic leveling trailer, including a chassis 1 and a car body 2, a hydraulic jack 3 is arranged inside the chassis 1, the output end of the hydraulic jack 3 is rotatably connected to the bottom of the car body 2, one end of the car body 2 is rotatably matched with the chassis 1, a bracket 4 is arranged at the front end of the chassis 1, lifting mechanisms 5 are symmetrically arranged on both sides of the chassis 1, a balancing bracket 6 is fixedly arranged inside the chassis 1, a pre-balancing mechanism 7 is arranged at the bottom of the balancing bracket 6, fixed brackets 8 are arranged on both sides of the pre-balancing mechanism 7, and the fixed brackets 8 are fixedly connected to the chassis 1.

[0032] Specifically, the hydraulic jack 3 will be able to lift the carriage 2 and rotate it to facilitate the unloading process. The bracket 4 can facilitate the detachable connection between the chassis 1 and the tractor at the front end. The balancing bracket 6 is used to monitor the balance state of the gravity of the carriage 2. The pre-balancing mechanism 7 can pre-balance the gravity when the carriage 2 is tilted. The lifting mechanism 5 can provide leveling support when the carriage 2 is tilted.

[0033] like Figure 3 and Figure 4 As shown, the balancing bracket 6 includes a pair of cross beams 601 and a pair of longitudinal beams 602, a pressure plate 603 is arranged at the upper end of the longitudinal beam 602, a buffer spring 604 is arranged between the bottom of the pressure plate 603 and the longitudinal beam 602, pressure rods 605 are fixedly arranged at both ends of the bottom of the pressure plate 603, and contact switches 801 are arranged at both ends of the fixed bracket 8, the pressure rods 605 penetrate the longitudinal beam 602 and are respectively opposite to the contact switches 801 at both ends of the fixed bracket 8, and the contact switch 801 is electrically connected to the lifting mechanism 5 and is used to control the opening and closing of the lifting mechanism 5.

[0034] Specifically, by setting a balancing bracket 6, the pressure plates 603 are symmetrically arranged on both sides of the bottom of the car 2. When the forces on both sides of the car 2 are balanced, the pressure plates 603 at both ends will not be subjected to downward pressure. When the car 2 tilts to one side, the pressure plate 603 on that side will begin to be subjected to the pressure of the car 2, and the pressure plate 603 will push the pressure rod 605 downward, and the buffer spring 604 will begin to be compressed and deformed. The pressure rod 605 will cooperate with the transmission assembly during the downward movement. When the pressure rod 605 continues to move downward, until the bottom of the pressure rod 605 hits the contact switch 801, the contact switch 801 is triggered to cause the lifting mechanism 5 on the same side to start to lift the support upward.

[0035] like Figure 5-Figure 9 As shown, the pre-balancing mechanism 7 includes a shell 701, both ends of the shell 701 are fixedly connected to the chassis 1, transmission components are arranged on both sides of the shell 701, a winding shaft 710 is passed through the shell 701, the transmission components are respectively transmitted and cooperated with the pressure rod 605 and the winding shaft 710, both ends of the winding shaft 710 are rotatably connected to the shell 701 through a torsion spring 717, a slideway 712 is arranged at the bottom of the shell 701, a slide bar 713 is fixedly arranged along the length direction of the slideway 712, a balancing weight block 714 is slidably installed on the slide bar 713, wire rollers 715 are rotatably installed at the four corners of the shell 701, a pull rope 716 is wound around the winding shaft 710, and both ends of the pull rope 716 are respectively fixedly connected to both ends of the balancing weight block 714 after passing around the wire roller 715.

[0036] The pulling rope 716 is wound around the winding shaft 710 in a clockwise direction.

[0037] Specifically, by setting the pre-balancing mechanism 7, when the carriage 2 tilts to the right, the pressure plate 603 on the right side will press the pressure rod 605 downward, and the pressure rod 605 will drive the winding shaft 710 to rotate counterclockwise through the transmission assembly during the downward movement. Since the pull rope 716 is wound around the winding shaft 710 clockwise, the winding shaft 710 will drive the left end of the pull rope 716 to reel in and the right end of the pull rope 716 to unwind when rotating counterclockwise. The pull rope 716 will pull the balancing weight block 716 in the process of retracting and unwinding. 4 slides to the left along the slide bar 713, so that the balancing weight 714 sliding to the left can be used to pre-balance the gravity of the right-leaning car 2. When the car 2 tilts to the left, the winding shaft 710 rotates clockwise and pulls the balancing weight 714 to slide to the right along the slide bar 713, that is, the gravity of the left-leaning car 2 can be balanced, so that the sliding process of the balancing weight 714 in the opposite direction of the tilting direction of the car 2 can be used to achieve the pre-balance of the gravity on both sides, which can effectively slow down the tilting trend of the car 2. When the balance on both sides of the car 2 is restored, the winding shaft 710 will be reversed under the action of the torsion spring 717 until it returns to the original state. At this time, the pull rope 716 will also pull the balancing weight 714 to slide in the opposite direction until the balancing weight 714 is located in the center of the slide bar 713, so as to prepare for the next gravity balance.

[0038] like Figure 5 and Figure 6 As shown, the transmission assembly includes a pair of transmission shafts 703 and a pair of transverse tooth plates 706. A fixed plate 702 is fixedly arranged in the shell 701. The transmission shaft 703 is rotatably installed on both ends of the fixed plate 702. A large circle gear 704 and a small circle gear 705 are sleeved on both ends of the transmission shaft 703. A longitudinal tooth groove 606 is arranged on one side of the pressure rod 605. Transverse tooth grooves are arranged on both upper and lower ends of the transverse tooth plate 706. The large circle gear 704 is meshed with the longitudinal tooth groove 606, and the small circle gear 705 is meshed with the transverse tooth groove at the lower end of the transverse tooth plate 706. Synchronous gears 711 are sleeved on both ends of the winding shaft 710, and the synchronous gear 711 is meshed with the transverse tooth groove at the upper end of the transverse tooth plate 706.

[0039] Specifically, when the right pressure rod 605 moves downward, the longitudinal tooth groove 606 will drive the transmission shaft 703 to rotate clockwise through the large circle gear 704, and the transmission shaft 703 will drive the small circle gear 705 to rotate synchronously, thereby driving the cross-tooth plate 706 to translate to the right, and the cross-tooth plate 706 will drive the winding shaft 710 to rotate counterclockwise through the synchronous gear 711 during the rightward movement. In this process, the meshing transmission of the gears will always keep the rotation directions of the winding shaft 710 and the transmission shaft 703 opposite, and the pull rope 716 will be wound around the winding shaft 710 clockwise, so that the pull rope 716 can pull the balancing weight 714 to slide in the direction opposite to the displacement direction of the cross-tooth plate 706, so as to achieve gravity balance on both sides.

[0040] like Figure 5 As shown, fixed seats 709 are extended at both ends of the shell 701, push rods 707 are fixedly provided at both ends of the transverse tooth plate 706, the push rods 707 slide through the corresponding fixed seats 709, and return springs 708 are provided between the two ends of the transverse tooth plate 706 and the fixed seats 709.

[0041] Specifically, when the cross tooth plate 706 is horizontally displaced to one side, the push rods 707 at both ends will slide in the fixed seat 709 to ensure the stability of the displacement process of the cross tooth plate 706. At the same time, the cross tooth plate 706 moves to one side, and the return spring 708 on that side will be squeezed by force, and the return spring 708 on the other side will be stretched and deformed. When the car 2 recovers its balance, the return springs 708 at both ends will drive the cross tooth plate 706 to automatically move in the opposite direction and reset until the cross tooth plate 706 returns to its original position to prepare for the next displacement.

[0042] like Fig.10 and Fig.11 As shown, the lifting mechanism 5 includes a bottom plate 501, which is fixedly connected to the chassis 1, a lifting plate 503 is arranged above the bottom plate 501, guide rods 502 are fixedly connected to the four corners of the bottom of the lifting plate 503, the guide rods 502 slide through the bottom plate 501, side plates 504 are fixedly arranged on both sides of the bottom of the lifting plate 503, and inclined slide grooves 505 are symmetrically arranged on the side plates 504.

[0043] Furthermore, push-pull cylinders 506 are fixedly provided at both ends of the base plate 501, and the contact switches 801 at both ends of the fixed bracket 8 are electrically connected to the corresponding push-pull cylinders 506 respectively. The output end of the push-pull cylinder 506 is fixedly connected with a sliding seat 507. A sliding rail 509 is provided at the upper end of the base plate 501. The sliding seat 507 is adapted to be slidably installed on the sliding rail 509. The sliding seat 507 is located between the side plates 504 on both sides. Sliding pins 508 are rotatably installed on both sides of the sliding seat 507, and the sliding pins 508 are adapted to be slidably installed in the inclined sliding groove 505.

[0044] Since the sliding distance of the balancing weight 714 is limited, the gravity balancing effect that the balancing weight 714 can provide is also limited. When the tilting trend of the carriage 2 exceeds the gravity balancing limit of the balancing weight 714, the lifting mechanism 5 is still needed to provide additional support to level the carriage 2.

[0045] Specifically, by setting up the lifting mechanism 5, when the car 2 is severely tilted to one side, the pressure plate 603 on that side will drive the pressure rod 605 to move downward until the bottom of the pressure rod 605 hits and triggers the contact switch 801, thereby causing the push-pull cylinders 506 at both ends of the same side to start running, and the push-pull cylinders 506 will horizontally push the sliding seat 507 to slide along the slide rail 509, and at the same time, the sliding pin 508 will always keep sliding in the inclined slide groove 505, and the sliding cooperation between the sliding pin 508 and the inclined slide groove 505 will push the lifting plate 503 to lift the car 2 upward, thereby providing support for the car 2 to achieve gravity leveling, and power is provided at both ends of the bottom of the lifting plate 503, and the force is uniform, so that the lifting support process can maintain balance and stability, which is beneficial to suppressing the tilting trend of the car 2.

[0046] The working principle of the present invention is as follows: Figure 1-Figure 11As shown, when the forces on both sides of the carriage 2 are balanced, the pressure plates 603 at both ends will not be subjected to downward pressure. When the carriage 2 tilts to the right, the pressure plate 603 on the right side will begin to be subjected to the pressure of the carriage 2, and the pressure plate 603 will push the pressure rod 605 downward, and the buffer spring 604 will begin to compress and deform. When the pressure rod 605 on the right side moves downward, the longitudinal tooth groove 606 will drive the transmission shaft 703 to rotate clockwise through the large circle gear 704, and the transmission shaft 703 will drive the small circle gear 705 to rotate synchronously, thereby driving the cross-tooth plate 706 to translate to the right, and during the rightward movement of the cross-tooth plate 706, the winding shaft 710 will be driven to rotate counterclockwise through the synchronous gear 711. Since the pull rope 716 is wound around the winding shaft 710 clockwise, the winding shaft 710 will drive the left end of the pull rope 716 to be wound up and the right end of the pull rope 716 to be unwound when it rotates counterclockwise. The pull rope 716 will pull the balancing weight block 714 to slide to the left along the slide bar 713 during the process of winding up and unwinding, so that the balancing weight block 714 sliding to the left can be used to pre-balance the gravity of the right-leaning car 2. Similarly, when the car 2 tilts to the left, the winding shaft 710 rotates clockwise and pulls the balancing weight block 714 to slide to the right along the slide bar 713, that is, the gravity of the left-leaning car 2 can be balanced, so that the sliding process of the balancing weight block 714 in the opposite direction of the tilting direction of the car 2 can be used to achieve pre-balance of the gravity on both sides, which can effectively slow down the tilting trend of the car 2. When the car 2 is severely tilted to one side, the pressure plate 603 on that side will drive the pressure rod 605 to move downward until the bottom of the pressure rod 605 hits and triggers the contact switch 801, thereby causing the push-pull cylinders 506 at both ends of the same side to start running, and the push-pull cylinders 506 will horizontally push the sliding seat 507 to slide along the slide rail 509, and at the same time the sliding pin 508 will always keep sliding in the inclined slide groove 505, and the sliding cooperation between the sliding pin 508 and the inclined slide groove 505 will push the lifting plate 503 to lift the car 2 upward, thereby providing support for the car 2 to achieve gravity leveling, and power is provided at both ends of the bottom of the lifting plate 503, and the force is uniform, so that the lifting support process can maintain balance and stability, which is beneficial to suppress the tilting trend of the car 2.

[0047] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An automatic leveling trailer, comprising a chassis (1) and a carriage (2), wherein a hydraulic jack (3) is arranged in the chassis (1), an output end of the hydraulic jack (3) is rotatably connected to the bottom of the carriage (2), one end of the carriage (2) is rotatably matched with the chassis (1), and a bracket (4) is arranged at the front end of the chassis (1), characterized in that: Lifting mechanisms (5) are symmetrically arranged on both sides of the chassis (1); a balancing bracket (6) is fixedly arranged inside the chassis (1); a pre-balancing mechanism (7) is arranged at the bottom of the balancing bracket (6); fixed brackets (8) are arranged on both sides of the pre-balancing mechanism (7); and the fixed brackets (8) are fixedly connected to the chassis (1); The balancing support (6) comprises a pair of cross beams (601) and a pair of longitudinal beams (602), a pressure plate (603) is arranged at the upper end of the longitudinal beam (602), a buffer spring (604) is arranged between the bottom of the pressure plate (603) and the longitudinal beam (602), pressure rods (605) are fixedly arranged at both ends of the bottom of the pressure plate (603), and contact switches (801) are arranged at both ends of the fixed support (8), the pressure rods (605) penetrate the longitudinal beam (602) and are respectively opposite to the contact switches (801) at both ends of the fixed support (8), and the contact switches (801) are electrically connected to the lifting mechanism (5) and are used to control the opening and closing of the lifting mechanism (5); The pre-balancing mechanism (7) comprises a housing (701), the two ends of the housing (701) being fixedly connected to the chassis (1), transmission components being arranged on both sides of the housing (701), a winding shaft (710) being inserted into the housing (701), the transmission components being respectively in transmission cooperation with the pressure rod (605) and the winding shaft (710), the two ends of the winding shaft (710) being rotatably connected to the housing (701) via a torsion spring (717), and the housing (701) A slideway (712) is provided at the bottom, a slide bar (713) is fixedly provided in the slideway (712) along the length direction, a balancing weight (714) is slidably installed on the slide bar (713), a wire roller (715) is rotatably installed at the four corners of the housing (701), a pull rope (716) is wound around the winding shaft (710), and two ends of the pull rope (716) are respectively fixedly connected to two ends of the balancing weight (714) after passing through the wire roller (715); The transmission assembly comprises a pair of transmission shafts (703) and a pair of transverse tooth plates (706). A fixed plate (702) is fixedly arranged in the housing (701). The transmission shaft (703) is rotatably installed on both ends of the fixed plate (702). A large circle gear (704) and a small circle gear (705) are sleeved on both ends of the transmission shaft (703). A longitudinal tooth groove (606) is arranged on one side of the pressure rod (605). Both upper and lower ends of the transverse tooth plate (706) are provided with transverse tooth grooves. The large circle gear (704) meshes with the longitudinal tooth groove (606). The small circle gear (705) meshes with the transverse tooth groove at the lower end of the transverse tooth plate (706). Synchronous gears (711) are sleeved on both ends of the winding shaft (710). The synchronous gear (711) meshes with the transverse tooth groove at the upper end of the transverse tooth plate (706). Fixed seats (709) are extended from both ends of the housing (701), push rods (707) are fixedly provided at both ends of the transverse tooth plate (706), the push rods (707) slide through the corresponding fixed seats (709), and return springs (708) are provided between both ends of the transverse tooth plate (706) and the fixed seats (709).

2. The automatic leveling trailer according to claim 1, characterized in that: The pulling rope (716) is wound around the winding shaft (710) in a clockwise direction.

3. The automatic leveling trailer according to claim 1, characterized in that: The lifting mechanism (5) comprises a bottom plate (501), the bottom plate (501) being fixedly connected to the chassis (1), a lifting plate (503) being arranged above the bottom plate (501), guide rods (502) being fixedly connected to the four corners of the bottom of the lifting plate (503), the guide rods (502) slidingly passing through the bottom plate (501), side plates (504) being fixedly arranged on both sides of the bottom of the lifting plate (503), and inclined slide grooves (505) being symmetrically passed through the side plates (504).

4. The automatic leveling trailer according to claim 3, characterized in that: Push-pull cylinders (506) are fixedly arranged at both ends of the base plate (501), contact switches (801) at both ends of the fixed bracket (8) are electrically connected to the corresponding push-pull cylinders (506) respectively, and a sliding seat (507) is fixedly connected to the output end of the push-pull cylinder (506). A sliding rail (509) is arranged at the upper end of the base plate (501), and the sliding seat (507) is adapted to be slidably installed on the sliding rail (509). The sliding seat (507) is located between the side plates (504) on both sides, and sliding pins (508) are rotatably installed on both sides of the sliding seat (507), and the sliding pins (508) are adapted to be slidably installed in the inclined sliding groove (505).

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