Bottom supporting device of self-discharging container

Abstract

A bottom supporting device of a self-discharging transportation box belongs to the field of transportation tools, the bottom supporting device is installed on a hydraulic driving crawler-type self-discharging transportation box, and the self-discharging transportation box comprises a box frame, a push plate, a right side wall, a crawler belt, a rear door, a left side wall, a driving device, a bottom cross beam and a bottom longitudinal beam; the bottom supporting device comprises a crawler belt, a rear guide wheel set, a supporting wheel frame, a supporting wheel, a front guide wheel set, a supporting steel wire rope and a steel wire rope connector. The track is a flexible conveying belt, can be curled, is mounted at the bottom of the box frame and is positioned on the supporting steel wire rope, one end is connected with the rear end of the framework of the driving device or the push plate, and the other end extends out of the rear door along the bottom of the box frame and is fixedly connected with the supporting steel wire rope; the cargo container has the advantages of being capable of effectively supporting cargoes in the cargo container and reducing unloading resistance.

Description

Technical Field

[0001] The present invention belongs to the field of transportation means, and particularly relates to a bottom support device for a crawler-type freight container with a self-unloading function. Background Art

[0002] In the field of freight transportation, in order to reduce the occupation of transport vehicles, people have invented container transportation, which greatly improves the transportation efficiency; in order to more conveniently achieve cargo transportation, especially the unloading problem during bulk cargo transportation, people have invented a freight container with a self-unloading function, abbreviated as a self-unloading freight container, which further improves the efficiency of bulk cargo transportation, reduces the labor intensity of unloading, and reduces the unloading time; on the other hand, in order to standardize the types and specifications of freight vehicles in our country, corresponding regulations have been made for the structures and types of vehicles engaged in freight transportation and freight containers, and corresponding standards have been formulated. At the same time, it is required that vehicles and freight containers that do not meet the standard regulations are not allowed to engage in freight business; therefore, people have developed a variety of freight containers that meet national standards and have self-unloading functions, roughly including side-tipping self-unloading containers, rear-tipping freight containers, and crawler-type flat-pushing freight containers; most of the existing crawler-type flat-pushing freight containers are fixed by a box body skeleton, and rely on power to push the unloading push plate together with the crawler at the bottom of the cargo box towards the rear door direction, so as to push the goods in the freight container to the rear door of the freight container. When the rear door is opened, the goods are unloaded from the rear door along with the movement of the goods push plate to achieve the unloading function; most of its power uses a hydraulic motor to drive a roller, the roller drives the crawler, and drives the push plate to achieve unloading; there is also a motor used as power to drive the power roller to drive the crawler through a speed reducer; there is also a hydraulic cylinder used to drive one end of the crawler, and drive the crawler by traction to drive the push plate to achieve unloading; the existing crawler-type self-unloading freight containers are found to have the following defects during use. First, the hydraulic motor and the motor used as power drive are large in volume, heavy in weight, and high in manufacturing cost; the hydraulic cylinder is divided into two types. One is driven by a single cylinder. This kind of cylinder is large in volume and too long in stroke, resulting in the need to add auxiliary supports during installation and operation, and also has the problem of being large in volume and heavy in weight. Because the weight causes a large amount of useless work for the tractor during cargo transportation, wasting energy; and the developed one driven by two cylinders uses a double-acting cylinder, which is high in cost, complex in control, prone to failure, and will cause uneven driving force of the two cylinders, resulting in uneven force on the moving parts and serious wear, and seriously causing unloading blockage; there is also the hard friction between the crawler and the beam at the bottom of the box frame, resulting in large unloading friction, large unloading resistance, easy damage to the crawler, and inflexible unloading. Summary of the Invention

[0003] In view of the above problems existing in the existing crawler self-unloading freight box driven by an oil cylinder, the present invention proposes a self-unloading freight box adopting a bottom support device. The specific technical solution is a bottom support device for a self-unloading freight box. The bottom support device is installed on a hydraulically driven crawler self-unloading freight box. The self-unloading freight box includes a box frame, a push plate, a right side wall, crawlers, a rear door, a left side wall, a driving device, a bottom cross beam and a bottom longitudinal beam. The box frame is the skeleton of this freight box, which can support and install the structural members of this freight box and be docked with a skeleton vehicle. The push plate is installed at the front end of the freight box and is located inside the box frame, and can move back and forth along the box frame. The right side wall is installed on the right side of the box frame, which can enclose the right side of the box frame and form a box volume cavity together with the push plate, the rear door, the crawlers and the left side wall. The crawlers are installed inside the box frame and at the bottom of the box frame. The crawlers are flexible bodies, one end is connected to the push plate, and the other end is connected to the front end of the skeleton of the driving device to form a closed loop, and can move together with the push plate at the bottom of the box frame as the push plate moves. The rear door is installed at the tail of the box frame, the upper part is hinged to the box frame, and the lower end is buckled to the bottom of the box frame through a lock. The lock can be opened or locked by power. The left side wall is installed on the left side of the box frame, which can enclose the left side of the box frame and form a loading volume cavity of this freight box together with the push plate, the right side wall, the crawlers and the rear door.

[0004] The driving device is installed at the bottom of the box frame and is located below the push plate, and is connected to the push plate through the skeleton on the driving device. The driving device includes a skeleton, a driving oil cylinder, a driving hook and a linkage device. The skeleton is of a frame type, which can support and install the components of the driving device. One end of the skeleton is connected to the push plate and is placed on the bottom longitudinal beam / bottom cross beam of the box frame, and can move back and forth along the direction of the bottom longitudinal beam. The driving oil cylinder is installed on the skeleton, connected to the skeleton and connected to the hydraulic system. There are multiple driving oil cylinders, which are single-acting hydraulic cylinders (this can reduce the weight of the oil cylinders, disperse the driving force, and thus improve the driving stability and softness), arranged in groups, and the groups are arranged in pairs and symmetrically along the movement center line of the skeleton. The number of them is even. The working sequences of the two oil cylinders in each pair of oil cylinders are opposite, that is, when the piston rod of one oil cylinder extends outwards, the piston rod of the other (group) oil cylinder paired with it should retract inwards. The driving hook is installed on the oil cylinder, connected to the oil cylinder body or the piston rod of the oil cylinder, and intermittently hooks or disengages from the bottom longitudinal beam to realize the driving or return of the oil cylinder. The linkage device is installed on the skeleton, fixedly connected to the skeleton, and its moving parts are respectively connected to the two (groups) of paired oil cylinders.

[0005] The bottom cross beams are installed at the bottom of the box frame, there are multiple ones, arranged horizontally in parallel, and the two ends are respectively connected to the bottom longitudinal beams and / or the side walls of the box frame. The bottom longitudinal beams are installed at the bottom of the box frame, there are more than two, arranged longitudinally, and are connected to the bottom cross beams or the side walls of the box frame.

[0006] Its characteristics are as follows: The bottom support device includes a crawler belt, a rear guide wheel group, a support wheel frame, support wheels, a front guide wheel group, a support steel wire rope, and a wire rope connector; the crawler belt is a flexible conveyor belt that can be curled, is installed at the bottom of the box frame, is located above the support steel wire rope, is connected to the rear end of the skeleton of the driving device or the push plate at one end, and is fixedly connected to the support steel wire rope after extending along the bottom of the box frame outside the rear door at the other end; the rear guide wheel group is installed at the rear of the box frame and is located below the rear door, and is composed of multiple guide wheels, and the guide wheels are installed in parallel and can rotate; the support wheel frame is installed on the bottom cross beam and is fixedly connected to the bottom cross beam; there are multiple support wheel frames, and the number thereof matches the number of support steel wire ropes; the support wheels are installed on the support wheel frames and are connected to the support wheel frames through wheel axles and can rotate on the support wheel frames; a wheel groove is provided on the outer circumference of the support wheels, and the depth of the wheel groove is less than the diameter of the support steel wire rope; the front guide wheel group is installed at the lower part of the front end of the box frame and is connected to the box frame, and is composed of multiple guide wheels, and the guide wheels are installed in parallel at equal intervals and correspond one by one to the guide wheels on the rear guide wheel group; the number of the guide wheels is adapted to the number of the support steel wire ropes; one end of the support steel wire rope is installed at the rear end of the skeleton of the driving device, is connected to the skeleton of the driving device through a wire rope connector, extends backward under the bottom surface of the crawler belt, bypasses the guide wheels on the rear guide wheel group and then is led out from under the bottom cross beam to the front end of the box frame, and bypasses the lower part of the front guide wheel group and then is connected to the front end of the skeleton of the driving device from above the guide wheels and is connected to the skeleton of the driving device; a closed loop is formed after being connected to the skeleton of the driving device; there are multiple support steel wire ropes, which are installed in parallel and are spaced to cover the bottom surface of the crawler belt; the number of the support steel wire ropes matches the number of the front guide wheel group and the rear guide wheel group; the wire rope connector is installed on the skeleton of the driving device, can firmly connect the support steel wire rope to the skeleton, and can adjust the length of the support steel wire rope in real time to control the magnitude of the support force of the support steel wire rope on the crawler belt, saving the driving energy for unloading the vehicle.

[0007] Further, grooves are provided on the outer circumferences of the guide wheels of the rear guide wheel group and the front guide wheel group, and the cross-sectional shape and size of the grooves match the cross-section and size of the support steel wire rope.

[0008] Further, the rear guide wheel group or the front guide wheel group is a guide roller, and parallel annular grooves are provided on the guide roller, and the shape and size of the grooves match the support steel wire rope, ensuring that the support steel wire rope is higher than the outer surface of the guide roller after passing around in the grooves.

[0009] Further, the number of the guide wheels of the rear guide wheel group and the front guide wheel group is the same, and they are evenly spaced to cover the transverse inner length of the bottom of the box frame.

[0010] Further, there is more than one support wheel on each support wheel frame.

[0011] Furthermore, the supporting steel wire rope is connected to the bottom part of the crawler at multiple points.

[0012] Furthermore, the supporting steel wire rope is a rope-shaped flexible body, such as a steel wire rope, a nylon rope, an anchor chain, a transmission chain, or a transmission belt.

[0013] In this text, direction indicators such as front, back, left, right, up, and down refer to the forward direction when the vehicle is moving forward, and are referenced in sequence.

[0014] Beneficial effects

[0015] The beneficial effects of the present invention are that it can reduce the total weight of the driving device, thereby reducing the manufacturing cost, and can generate a soft driving force, reducing the movement resistance during unloading and saving unloading energy. Description of the drawings

[0016] Figure 1 is a schematic diagram of the external structure of the self-unloading freight box of the present invention

[0017] Figure 2 is a schematic diagram of the installation position of the driving device of the freight box of the present invention

[0018] Figure 3 is a schematic diagram of the bottom structure of the present invention

[0019] Figure 4 is a schematic diagram of the longitudinal sectional structure of the present invention with the rear door removed

[0020] Figure 5 is a schematic diagram of the rear half structure of the support structure of the present invention with the crawler removed

[0021] Figure 6 is a schematic diagram of the front structure after the crawler is removed

[0022] Figure 7 is a schematic diagram of a part of the driving device of the present invention

[0023] 1. Box frame, 2. Pusher plate, 3. Right side wall, 4. Crawler, 5. Rear door, 6. Left side wall, 7. Driving device, 8. Bottom cross beam, 9. Bottom longitudinal beam, 10. Rear reversing wheel set, 11. Support wheel, 12. Support wheel frame, 13. Front reversing wheel set, 14. Support steel wire rope, 15. Steel wire rope connector, 71. Skeleton, 72. Outer left driving oil cylinder, 73. Outer left driving hook, 74. Inner left driving oil cylinder, 75. Inner left driving hook, 76. Inner right driving hook, 77. Outer right driving oil cylinder, 78. Reversing wheel, 79. Mounting frame, 710. Steel wire rope. Specific embodiments

[0024] To better illustrate the technical solution of the present invention, the specific implementation manner of the present invention will be further described below in conjunction with the accompanying drawings. For example, Figures 1-7 , in this example, the crawler belt commonly used in the industry for conveyor belts is selected as the crawler 4, and the steel wire rope with multiple strands of steel wires commonly used in the industry is selected as the support steel wire rope 14. According to the width of the commonly used freight container in the industry, 7 support steel wire ropes 14 are selected in this example and evenly distributed on the bottom of the box frame 1; the commonly used steel wire rope connector in the industry is used as the steel wire rope connector 15 in this example. In this example, one end of the support steel wire rope 14 connected to the rear end of the skeleton 71 is used, and the steel wire rope is connected by the steel wire rope connector 15, while the connection with the front end of the skeleton 71 uses the commonly used bolt fixing method in the industry for connection, which saves manufacturing costs and reduces the overall weight of the freight container; the crawler 4 is installed on the bottom of the box frame 1, above the support steel wire rope 14, one end is connected to the rear end of the skeleton 71 of the driving device 7 or the push plate 2, and the other end extends along the bottom of the box frame 1 to the outside of the rear door and then is fixedly connected to the support steel wire rope 14; the commonly used guide wheel set mode in the industry is selected, and 7 pairs of guide wheels are respectively connected to the lower rear cross beam and the lower front cross beam of the box frame 1 through the wheel frame, and are evenly distributed front and back and correspond one by one; the support wheel frame 12 is installed on the bottom cross beam 8 and fixedly connected to the bottom cross beam 8; there are 7 support wheel frames 12 on each bottom cross beam 8, and the positions correspond to each guide wheel of the front guide wheel group 13 and the rear guide wheel group 10 longitudinally; the pulley with a groove on the outer circumference and a pulley shaft commonly used in the industry is selected as the support wheel 11, and the support wheel 11 is installed on the support wheel frame 12 and connected to the support wheel frame 12 through the wheel shaft and can rotate on the support wheel frame 12; in this example, the form of installing 2 support wheels on each support wheel frame 12 is selected, so that the support wheel frame 12 can be evenly stressed; in this example, the support steel wire rope 14 is extended backward under the bottom surface of the crawler 4, surrounds the guide wheel on the rear guide wheel group 10 and then leads out from the lower part of the bottom cross beam 8 to the front end of the box frame 1, and bypasses the front guide wheel group 13 from the lower part of the front guide wheel group 13 and then is connected to the front end of the driving device skeleton 71 and the skeleton 71 from above the guide wheel; the support steel wire rope 14 forms a closed loop after being connected to both ends of the driving device 7 skeleton 71; it can reduce the friction between the crawler 4 and the bottom of the box frame 1 and save the driving energy for unloading the vehicle, thus completing the implementation of the bottom support device.

[0025] In this example, the box frame, push plate, right side wall, left side wall, crawler track, rear door, bottom cross beam and bottom longitudinal beam of the crawler type dump freight box commonly used in the industry are selected as the box frame 1, push plate 2, right side wall 3, left side wall 6, crawler track 4, rear door 5, bottom cross beam 8 and bottom longitudinal beam 9 of this example respectively, and are assembled into a freight box according to the common assembly method in this industry; in this example, the drive device 7 is selected to be installed at the bottom of the box frame 1 and is located under the push plate 2, and is connected to the push plate 2 through the frame 71 on the drive device 7; the selected drive device 7 includes a frame 71, a drive cylinder (including 72, 74 and 77), a drive hook and a linkage device; in this example, the selected frame 71 is a frame-type structure commonly used in the field, which can support and install the components of the drive device; One end of the skeleton 71 is connected to the push plate and placed on the bottom longitudinal beam 9 / bottom cross beam 8 of the box frame 1, and can move forward and backward along the direction of the bottom longitudinal beam 9; the driving cylinder is installed on the skeleton 71, connected to the skeleton 71, and connected to the hydraulic system of the dump freight box commonly used in this industry; in this example, 4 driving cylinders are selected, divided into two groups, all of which are single-acting hydraulic cylinders, which can reduce the weight and volume of the cylinders, disperse the driving force and thus improve the stability and softness of the drive, each group of two, and each pair of cylinders in each group of cylinders are symmetrically installed along the vertical center line of the push plate, that is, the two cylinders in each group are installed on both sides of the center line of the push plate, and are symmetrical with respect to the center line, and the working order of each pair of cylinders is opposite, that is, the piston rod of one cylinder extends outward When the oil cylinder is working, the cylinder body is connected to the bottom cross beam 8 through the driving hook, thereby driving the frame 71 to move at the bottom of the box frame 1, and then driving the push plate 2 and the crawler 4 together with the goods loaded on the crawler 4 to move along the bottom longitudinal beam 9; the oil cylinder body can also be hinged to the frame 71, and the driving hook can be installed on the piston rod, which can also realize the above functions, but it is flexible according to the installation position and the overall layout; in this example, the ratchet hook commonly used in this industry is selected as the driving hook. In this example, according to the aforementioned piston rod fixing mode, the driving hook is installed on the oil cylinder body and connected to the oil cylinder body The bottom cross beam 8 is connected to the bottom cross beam 8, and can be intermittently connected or disconnected from the bottom cross beam 8 to realize the driving or return of the oil cylinder; that is, when driving, the driving hook is connected to the bottom cross beam 8, so that when the piston rod is extended, the oil cylinder body is driven through the driving hook and then drives the bottom cross beam 8. Because the bottom cross beam 8 is fixedly connected to the box frame 1, and the frame 71 is movable, the frame 71 is driven in disguise to move along the bottom longitudinal beam 9, which also drives the push plate 2 and the crawler 4 to move synchronously. The goods on the crawler 4 will move step by step toward the rear door 5, and the rear door will be opened step by step to unload the goods, realizing the self-unloading function; the linkage device selected in this example includes a mounting frame 79, a reversing wheel 78, a wire rope 710 and a connecting piece; the mounting frame 79 is fixedly installed on the frame 71 and connected to the frame 71;In this example, since two sets of two oil cylinders are adopted, two linkage devices are selected and installed between the outer left drive oil cylinder 72 and the inner left drive oil cylinder 74, and between the outer right drive oil cylinder 77 and the inner right drive oil cylinder (the oil cylinder where the inner right drive hook 76 is located); the reversing wheel 78 is installed on the mounting frame 79 and connected to the mounting frame 79 through a wheel axle, and can rotate freely on the wheel axle; in this example, a steel wire rope commonly used in this industry is selected as the steel wire rope 710, the steel wire rope 710 is installed on the reversing wheel 78 and wound around the outer circumference of the reversing wheel 78, and both ends are connected to the cylinder bodies of the outer left drive oil cylinder 72 and the inner left drive oil cylinder 74 through connectors respectively; a steel wire rope connector commonly used in this industry is selected as the connector in this example, the connector is installed at both ends of the steel wire rope 710 and hinged to the cylinder body; similarly, another steel wire rope 710 is connected to the outer right drive oil cylinder 77 and the inner right drive oil cylinder respectively through the reversing wheel 78 and connectors, thus completing the implementation of the present invention; because the single-acting oil cylinder has a simpler structure, smaller volume and lighter weight compared with the double-acting oil cylinder, however, it cannot reset automatically. Due to the function of the linkage device, this defect is overcome, and multiple oil cylinders are used for driving, dispersing the stress points of the push plate 2, reducing the occupied space volume of the drive oil cylinder, reducing the manufacturing cost, reducing the overall weight of the freight container, saving energy, and at the same time meeting the relevant national standards for freight containers.;

[0026] During application, when the freight container is in the unloading state, the steel wire rope connector 15 is tightened to shorten the length of the support steel wire rope 14, that is, to tighten the support steel wire rope. When the driving device 7 drives the support steel wire rope 14 together with the crawler 4 and the goods on the crawler 4 to move towards the rear end of the container frame 1, due to the tension of multiple support steel wire ropes 14, the crawler 4 is supported and partially separated from the contact with the bottom of the container frame 1, thus reducing a lot of friction between the crawler 4 and the bottom of the container frame 1. Otherwise, there are usually dozens of tons of goods on the crawler 4, and the friction is imaginable; during the unloading process, the lower part of the support steel wire rope 14 is supported by the support wheel 11, which ensures that the movement of the support steel wire rope 14 is switched from sliding friction to rolling friction, reducing the resistance of the driving device 7, saving energy, and reducing the weight and volume of the driving device 7 itself; until the unloading is completed; after the unloading is completed, in order to extend the service life of the support steel wire rope 14, the steel wire rope connector 15 can be loosened, so that the pre-tightening force on the support steel wire rope 14 is reduced or disappears, thus extending the service life of the support steel wire rope 14.

Claims

1. A bottom support device for a self-unloading freight box. The bottom support device is installed on a hydraulically driven crawler-type self-unloading freight box. The self-unloading freight box includes a box frame, a push plate, a right side wall, crawlers, a rear door, a left side wall, a driving device, bottom cross beams, and bottom longitudinal beams. The box frame is the framework of the freight box, capable of supporting and installing the structural components of the freight box and docking with the skeleton vehicle. The push plate is installed at the front end of the freight box and inside the box frame, and can move back and forth along the box frame. The right side wall is installed on the right side of the box frame, capable of closing the right side of the box frame, and forms a box volume cavity together with the push plate, the rear door, the crawlers, and the left side wall. The crawlers are installed inside the box frame and at the bottom of the box frame. The crawlers are flexible bodies, one end is connected to the push plate, and the other end is connected to the front end of the skeleton of the driving device, forming a closed loop, and can move together with the push plate at the bottom of the box frame as the push plate moves. The rear door is installed at the tail of the box frame, the upper part is hinged to the box frame, and the lower end is buckled to the bottom of the box frame through a lock. The lock can be opened or locked by power. The left side wall is installed on the left side of the box frame, capable of closing the left side of the box frame, and forms a loading volume cavity of the freight box together with the push plate, the right side wall, the crawlers, and the rear door. The driving device is installed at the bottom of the box frame and under the push plate, and is connected to the push plate through the skeleton on the driving device. The driving device includes a skeleton, driving cylinders, driving hooks, and a linkage device. The skeleton is of a frame type, capable of supporting and installing the components of the driving device. One end of the skeleton is connected to the push plate and placed on the bottom longitudinal beam / bottom cross beam of the box frame, and can move back and forth along the direction of the bottom longitudinal beam. The driving cylinders are installed on the skeleton, connected to the skeleton, and connected to the hydraulic system. There are multiple driving cylinders, which are single-acting hydraulic cylinders, arranged in groups. The number of groups is arranged in pairs and symmetrically along the movement center line of the skeleton. The number is even. The working sequences of the two cylinders in each pair of cylinders are opposite, that is, when the piston rod of one cylinder extends outwards, the piston rod of the other cylinder paired with it should retract inwards. The driving hooks are installed on the cylinders, connected to the cylinder body or the piston rod of the cylinder, and intermittently hook or disengage from the bottom longitudinal beam to achieve the driving or return of the cylinders. The linkage device is installed on the skeleton, fixedly connected to the skeleton, and its moving parts are respectively connected to the two cylinders in a pair of cylinders. The bottom cross beams are installed at the bottom of the box frame, there are multiple, arranged horizontally in parallel, and the two ends are respectively connected to the bottom longitudinal beams and / or the side walls of the box frame. The bottom longitudinal beams are installed at the bottom of the box frame, there are more than two, arranged longitudinally, and connected to the bottom cross beams or the side walls of the box frame. Its characteristics are: The described bottom support device includes a crawler belt, a rear guide wheel set, a support wheel frame, support wheels, a front guide wheel set, support steel wires, and a steel wire connector; the crawler belt is a flexible conveyor belt that can be curled, installed at the bottom of the box frame, above the support steel wires, with one end connected to the rear end of the skeleton of the driving device or the push plate, and the other end extending along the bottom of the box frame and fixed to the support steel wire after going outside the rear door; the rear guide wheel set is installed at the rear of the box frame and below the rear door, composed of multiple guide wheels, and the guide wheels are installed in parallel and can rotate; the support wheel frame is installed on the bottom cross beam and fixedly connected to the bottom cross beam; there are multiple support wheel frames, and the number thereof matches the number of support steel wires; the support wheels are installed on the support wheel frames and connected to the support wheel frames through wheel axles and can rotate on the support wheel frames; a wheel groove is provided on the outer circumference of the support wheels, and the depth of the wheel groove is less than the diameter of the support steel wires; the front guide wheel set is installed at the lower part of the front end of the box frame and connected to the box frame, composed of multiple guide wheels, and the guide wheels are installed in parallel at uniform intervals and correspond one by one to the guide wheels on the rear guide wheel set; the number of the guide wheels is adapted to the number of the support steel wires; one end of the support steel wire is installed at the rear end of the skeleton of the driving device and connected to the skeleton of the driving device through a steel wire connector, extends backward under the bottom surface of the crawler belt, bypasses the guide wheels on the rear guide wheel set and then leads out from under the bottom cross beam to the front end of the box frame, bypasses the lower part of the front guide wheel set and then is connected to the front end of the skeleton of the driving device from above the guide wheels and the skeleton of the driving device; after being connected to the skeleton of the driving device, a closed loop is formed; there are multiple support steel wires, installed in parallel and spaced to cover the bottom surface of the crawler belt; the number of the support steel wires matches the number of the front guide wheel set and the rear guide wheel set; the steel wire connector is installed on the skeleton of the driving device, can firmly connect the support steel wire to the skeleton, and can adjust the length of the support steel wire in real time to control the magnitude of the supporting force of the support steel wire on the crawler belt, saving the driving energy for unloading the vehicle.

2. The bottom support device of a self-unloading freight box according to claim 1, characterized in that: Grooves are provided on the outer circumferences of the guide wheels of the rear guide wheel set and the front guide wheel set, and the cross-sectional shape and size of the grooves match the cross-section and size of the support steel wires.

3. The bottom support device of a self-tipping freight box according to claim 1, characterized in that: The rear guide wheel set or the front guide wheel set is a guide roller, and parallel annular grooves are provided on the guide roller, and the shape and size of the grooves match the support steel wires, ensuring that the support steel wire is higher than the outer surface of the guide roller after bypassing in the grooves.

4. The bottom support device of a self-tipping freight box according to claim 1, characterized in that: The number of the guide wheels of the rear guide wheel set and the front guide wheel set is the same, and they are evenly spaced and cover the transverse inner length of the bottom of the box frame.

5. The bottom support device of a self-tipping freight box according to claim 1, characterized in that: There is more than one support wheel on each support wheel frame.

6. The bottom support device of a self-tipping freight box according to claim 1, characterized in that: The part of the support steel wire located at the bottom of the crawler belt is connected to the crawler belt at multiple points.

7. The bottom support device of a self-tipping freight box according to claim 1, characterized in that: The support steel wire is a rope-shaped flexible body, such as a steel wire rope, a nylon rope, an anchor chain, a transmission chain, and a transmission belt.

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