Discharging device of dumper

Abstract

The invention relates to the technical field of unloading and conveying devices, and discloses a dumper unloading device which comprises a scraping mechanism and a linear driving mechanism. The scraping mechanism comprises a middle scraping plate, two bottom wall scraping plates, two side wall scraping plates, a connecting plate and a sliding connecting assembly, the middle scraping plate is matched with a protrusion in the car hopper, the lower end of the outer side of the protrusion is movably sleeved with the middle scraping plate, and the bottom of the middle scraping plate makes contact with the inner bottom wall of the car hopper. According to the scraping mechanism, a multi-section movable scraping plate form is adopted, and when the scraping mechanism is in a contraction state, the scraping mechanism can be tightly attached to the protrusions and the inner wall of the car hopper, perfectly adapts to the space of the protrusion area, can well adapt to a special car hopper with the inner side provided with protrusion prisms, and can comprehensively and effectively scrape the inner side of the special car hopper.

Description

Technical Field

[0001] The present invention relates to the technical field of unloading and conveying devices, and more specifically, it relates to a self-unloading device for a dump truck. Background Art

[0002] A dump truck is a commonly used transportation vehicle, mainly composed of a chassis, a carriage (dump body), a lifting mechanism, etc. Its remarkable feature is that the carriage can automatically dump goods through a hydraulic lifting mechanism, greatly improving the unloading efficiency. Its chassis is generally based on a truck chassis, with good load-bearing capacity and driving performance, and can adapt to various road conditions for transportation. The shape and material of the carriage are diverse, depending on the nature of the transported goods, with various shapes such as rectangular and U-shaped, and materials including steel, aluminum alloy, etc., to meet different strength and weight requirements. Dump trucks are widely used in industries such as construction, mining, and environmental sanitation, and play an important role in transporting bulk materials such as sand, gravel, ore, construction waste, and domestic waste.

[0003] In related technologies, when a dump truck transports cement or some relatively sticky materials, it is easy for some materials to adhere to the inner wall of the dump body. To solve the problem of material adhesion, for example, the publication number CN108689186A discloses a self-unloading and de-adhesion device for a dump truck, whose structure includes an isolation and limit plate, a first support baffle, a fast material cleaning device, a second support baffle, a movable buckle, a movable baffle, a support buffer block, a support and protection bottom plate, a third support baffle, and a scraping and cleaning plate. Although this unloading and de-adhesion device can quickly and automatically perform the de-adhesion operation of materials by adding a fast material cleaning device on the equipment, replacing the manual cleaning method, however, for a dump body with a prism having a protrusion at the inner end, since the scraper in this unloading and de-adhesion device is an integral flat plate, it is difficult to scrape the protruding position inside the dump body. Therefore, there is an urgent need for a scraping and unloading device that can be applied to a special dump body with a protruding prism and effectively scrape the sticky materials on its inner side wall. Summary of the Invention

[0004] The purpose of the present invention is to provide a self-unloading device for a dump truck to solve the above-mentioned technical problems.

[0005] The present invention solves the above-mentioned existing technical problems through the following technical solutions:

[0006] The present invention provides a self-unloading device for a dump truck, including: a scraping mechanism and a linear driving mechanism;

[0007] The scraping mechanism includes an intermediate scraper adapted to the protrusion in the hopper, two bottom wall scrapers, two side wall scrapers, a connecting plate, and a sliding connection assembly. The intermediate scraper is movably sleeved on the lower end outside the protrusion, and its bottom contacts the inner bottom wall of the hopper. Both sides of the intermediate scraper are respectively slidably connected to the two bottom wall scrapers through the sliding connection assembly. The bottoms of the two bottom wall scrapers both contact the inner bottom wall of the hopper. The two bottom wall scrapers are fixedly connected to the two side wall scrapers one by one, and one side of each of them contacts the inner side wall of the hopper. The two ends of the connecting plate are respectively fixed to the tops of the two side wall scrapers;

[0008] The sliding connection assembly includes an elastic connecting piece and a self-locking piece. The two ends of the elastic connecting piece are respectively fixed to the intermediate scraper and the bottom wall scraper. The self-locking piece is arranged on the intermediate scraper and is used to clamp and lock the bottom wall scraper that slides to a preset position on the intermediate scraper, so that the bottom wall scraper cannot move relative to the intermediate scraper;

[0009] The linear driving mechanism is arranged on the side wall of the hopper, and its driving end is connected to the top of one of the side wall scrapers. The scraping mechanism is driven by the linear driving mechanism to linearly slide along the inner wall of the hopper.

[0010] As a further optimized solution of the present invention, the elastic connecting piece includes a slider, a connecting spring, and two pulleys. Limiting chutes are arranged on both sides of the top of the intermediate scraper. Guide grooves adapted to the pulleys are arranged on two opposite side walls of the limiting chute. The two ends of the connecting spring are respectively fixed to the inner wall of the limiting chute and one side of the slider. The slider is fixedly installed at the upper end of the bottom wall scraper. The two pulleys are respectively installed on both sides of the slider, and their outer sides are respectively in rolling contact with the two guide grooves.

[0011] As a further optimized solution of the present invention, the self-locking piece is a contact extrusion type clamping structure. The contact extrusion type clamping structure includes a locking card shaft, an extrusion shaft body, a first spring, and a second spring. The locking card shaft is slidably installed in the intermediate scraper, and its top end can extend upward into the limiting chute. The first spring is fixedly installed between the bottom end of the locking card shaft and the inside of the intermediate scraper. An inclined groove adapted to the extrusion shaft body is arranged on one side of the extrusion shaft body. The extrusion shaft body is located on one side of the locking card shaft and is slidably connected to the inside of the intermediate scraper. The end of the extrusion shaft body away from the locking card shaft can extend to the outside of the intermediate scraper. The second spring is fixedly installed between the extrusion shaft body and the intermediate scraper. A card hole adapted to the locking card shaft is arranged at the bottom of the slider.

[0012] As a further optimized solution of the present invention, the linear drive mechanism is a lead screw drive structure, which includes a drive motor and a lead screw. The drive motor is fixedly installed on the side wall of the hopper. Moving grooves are provided on two opposite side walls of the hopper. The lead screw is rotatably installed in one of the moving grooves, and one end thereof is fixed to the drive end of the drive motor. The outer side of the lead screw is threadedly connected to the top of one side wall scraper, and the top end of the other side wall scraper is slidably connected to the side wall of the hopper.

[0013] As a further optimized solution of the present invention, the self-locking member is an electromagnetic induction structure, which includes a locking card shaft, a first spring, an electromagnet and an induction switch. The electromagnet is located directly below the locking card shaft and is fixed to the inside of the middle scraper. The induction switch is installed outside the protrusion and is electrically connected to the electromagnet.

[0014] As a further optimized solution of the present invention, the linear drive mechanism is a belt drive structure, which includes a drive motor, two pulley groups and a transmission rod. The two pulley groups are symmetrically arranged on both sides of the side wall of the hopper. Each pulley group consists of two linearly distributed pulleys. The two pulleys are connected by a transmission belt. The top ends of the two side wall scrapers are respectively fixed to the corresponding transmission belts.

[0015] As a further optimized solution of the present invention, the middle scraper is a U-shaped structure adapted to the protrusion in the hopper, and its middle section is in an inclined posture.

[0016] As a further optimized solution of the present invention, the middle scraper, the two bottom wall scrapers and the two side wall scrapers are all made of high-strength wear-resistant steel, and a bevel is provided at the contact end with the inner wall of the hopper.

[0017] As a further optimized solution of the present invention, a protective cover is installed outside the drive motor, and the length of the lead screw is adapted to the length of the hopper.

[0018] As a further optimized solution of the present invention, the induction switch is an infrared induction switch, and the electromagnet is circular.

[0019] The beneficial effects of the present invention are as follows:

[0020] The scraping mechanism provided by the present invention adopts a multi-segment movable scraper form. When in a contracted state, it can closely fit the inner wall of the protrusion and the truck bed, perfectly adapting to the space of the protrusion area. It not only does not affect the normal loading of materials, but also for the special protrusion area on the inner side of the truck bed, when scraping and removing the sticky substances, through the movement of the bottom wall scraper, the sticky substances in the protrusion area are first scraped and removed, and then assembled into an integral scraper with the middle scraper to continue scraping and cleaning other positions on the inner wall of the truck bed. Therefore, the scraping mechanism can well adapt to a special truck bed with protruding prisms on the inner side and can scrape it comprehensively and effectively on the inner side. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic structural diagram of the self-unloading truck unloading device provided by the present invention after being installed on the truck bed of the self-unloading truck;

[0022] Figure 2 FIG. is a schematic structural diagram of the interior of the self-unloading truck unloading device provided by the present invention after being installed on the truck bed of the self-unloading truck;

[0023] Figure 3 FIG. is a schematic structural diagram of a self-unloading truck unloading device provided by the present invention;

[0024] Figure 4 FIG. is a sectional view of the position of the middle scraper sliding connecting member in a self-unloading truck unloading device provided by the present invention;

[0025] Figure 5 is the present invention Figure 4 Partial enlarged schematic view at A in;

[0026] Figure 6 FIG. is a schematic structural diagram of a partial position of the bottom wall scraper in a self-unloading truck unloading device provided by the present invention;

[0027] Figure 7 FIG. is a sectional view of the position of the middle scraper self-locking member in a self-unloading truck unloading device provided by the present invention;

[0028] Figure 8 is the present invention Figure 7 Partial enlarged schematic view at B in;

[0029] Figure 9 FIG. is a schematic structural diagram of the exterior of the self-locking member in a self-unloading truck unloading device provided by the present invention;

[0030] Figure 10 FIG. is a schematic structural diagram of a partial position of the linear drive mechanism in a self-unloading truck unloading device provided by the present invention;

[0031] Figure 11 FIG. is a schematic structural diagram of the second embodiment of a self-unloading truck unloading device provided by the present invention;

[0032] Figure 12 This is a schematic structural diagram of the third embodiment in a tipping device of a dump truck provided by the present invention.

[0033] In the figure: 1, hopper; 2, protrusion; 3, scraping mechanism; 31, intermediate scraper; 32, bottom wall scraper; 33, side wall scraper; 34, connecting plate; 35, sliding connection assembly; 351, slider; 352, connecting spring; 353, pulley; 354, limiting chute; 355, guiding groove; 356, locking card shaft; 357, extrusion shaft body; 358, first spring; 359, second spring; 3510, inclined groove; 3511, card hole; 3512, electromagnet; 3513, induction switch; 4, linear drive mechanism; 41, drive motor; 42, transmission lead screw; 43, moving groove; 44, transmission rod; 45, belt pulley; 46, transmission belt. Detailed implementation manners

[0034] Now, the subject matter described herein will be discussed with reference to example embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the protection scope of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples.

[0035] Embodiment 1

[0036] Please refer to Figures 1 to 3, a tipping device for a dump truck, comprising: a scraping mechanism 3 and a linear driving mechanism 4; the scraping mechanism 3 includes an intermediate scraper 31 adapted to the protrusion 2 in the hopper 1, two bottom wall scrapers 32, two side wall scrapers 33, a connecting plate 34 and a sliding connection assembly 35. The intermediate scraper 31 is a U-shaped structure adapted to the protrusion 2 in the hopper 1, and its middle section is in an inclined posture. The intermediate scraper 31 is movably sleeved on the lower end outside the protrusion 2, and its bottom contacts the inner bottom wall of the hopper 1. Both sides of the intermediate scraper 31 are respectively slidably connected to the two bottom wall scrapers 32 through the sliding connection assembly 35. The bottoms of the two bottom wall scrapers 32 both contact the inner bottom wall of the hopper 1. The two bottom wall scrapers 32 are fixedly connected to the two side wall scrapers 33 one by one, and one side of them contacts the inner side wall of the hopper 1. The two ends of the connecting plate 34 are respectively fixed to the tops of the two side wall scrapers 33; the sliding connection assembly 35 includes an elastic connecting piece and a self-locking piece. The two ends of the elastic connecting piece are respectively fixed to the intermediate scraper 31 and the bottom wall scraper 32. The self-locking piece is arranged on the intermediate scraper 31 and is used for clamping and locking the bottom wall scraper 32 that slides to a preset position of the intermediate scraper 31, so that the bottom wall scraper 32 cannot move relative to the intermediate scraper 31; the linear driving mechanism 4 is arranged on the side wall of the hopper 1, and its driving end is connected to the top of one of the side wall scrapers 33, and the scraping mechanism 3 is driven to linearly slide along the inner wall of the hopper 1 through the linear driving mechanism 4.

[0037] It should be noted that when the above-mentioned unloading device is in use, the hopper 1 moves to an inclined state under the driving of the hydraulic lifting mechanism, so that most of the materials are directly separated from the hopper 1. Driven by the linear driving mechanism 4, the two side wall scrapers 33, the two bottom wall scrapers 32 and the connecting plate 34 slide linearly along the inner side of the hopper 1 together with the linear driving mechanism 4. At this time, since the middle scraper 31 is sleeved outside the protrusion 2 and under the elastic reset action of the elastic connecting piece, when the bottom wall scraper 32 moves, the middle scraper 31 does not move temporarily, so that the bottom wall scraper 32 gradually approaches the middle scraper 31. During the process of the bottom wall scraper 32 moving closer to the middle scraper 31, the materials adhered to the area between the two sides of the protrusion 2 and the inner side of the hopper 1 can be scraped and cleaned. When the bottom wall scraper 32 slides to the position corresponding to the middle scraper 31 and the self-locking piece, the self-locking piece automatically clamps and locks the sliding ends of the bottom wall scraper 32 and the middle scraper 31, and the elastic connecting piece is just completely reset. By clamping and locking the bottom wall scraper 32, it can drive the middle scraper 31 to move together. During the movement process, the relative sliding of the bottom wall scraper 32 relative to the middle scraper 31 can be prevented, so as to ensure effective scraping and cleaning of the adhered materials. By scraping along the inner bottom wall of the hopper 1 with the middle scraper 31 and the bottom wall scrapers 32 on both sides of it, the adhesives adsorbed on the inner bottom wall of the hopper 1 can be scraped and removed. By linearly sliding the two side wall scrapers 33 along the side wall of the hopper 1, the materials adhered to the side wall of the hopper 1 can be scraped and removed. When the entire scraping mechanism 3 moves to the end of the hopper 1, the scraped adhered materials are separated from the hopper 1 under the action of gravity. After the cleaning is completed, the scraping mechanism 3 is driven by the linear driving mechanism 4 to move back to the original position. When the middle scraper 31 moves into contact with the protrusion 2, the self-locking piece synchronously releases the locking effect on the bottom wall scraper 32. Due to the obstruction of the protrusion 2, it will not continue to move with the bottom wall scraper 32. The two bottom wall scrapers 32 and the two side wall scrapers 33 continue to be driven by the scraping mechanism 3, so that the bottom wall scraper 32 gradually moves away from the middle scraper 31, and the elastic connecting piece is synchronously stretched by the bottom wall scraper 32 until the bottom wall scraper 32 moves into contact with the inner wall of the hopper 1, so that the entire scraping mechanism 3 moves to the preset contracted state. At this time, since the middle scraper 31, the bottom wall scraper 32 and the side wall scraper 33 are all closely attached to the inner side of the hopper 1, it can prevent materials from entering the gaps between the hopper 1 and the middle scraper 31 and the bottom wall scraper 32 when loading materials.

[0038] It can be seen from this that the scraping mechanism 3 provided by the present invention adopts a multi-segment movable scraper form. When in a contracted state, it can closely fit the inner walls of the protrusion 2 and the hopper 1, perfectly adapting to the space in the protrusion 2 area. It not only does not affect the normal loading of materials, but also for the special protrusion 2 area on the inner side of the hopper 1, when scraping and removing the sticky substances, through the movement of the bottom wall scraper 32, the sticky substances in the protrusion 2 area are first scraped and removed, and then assembled with the middle scraper 31 into an integrated scraper to continue scraping and cleaning other positions on the inner wall of the hopper 1. Therefore, the scraping mechanism 3 can well adapt to the special hopper 1 with a prism-shaped protrusion 2 on the inner side and can scrape its inner side comprehensively and effectively.

[0039] Please refer to Figures 4 to 6 , the elastic connecting member includes a slider 351, a connecting spring 352 and two pulleys 353. Limiting chute grooves 354 are provided on both sides of the top of the middle scraper 31. Guiding grooves 355 adapted to the pulleys 353 are provided on two opposite side walls of the limiting chute grooves 354. Two ends of the connecting spring 352 are respectively fixed to the inner wall of the limiting chute groove 354 and one side of the slider 351. The slider 351 is fixedly installed at the upper end of the bottom wall scraper 32. The two pulleys 353 are respectively installed on both sides of the slider 351, and their outer sides are respectively in rolling contact with the two guiding grooves 355.

[0040] It should be noted that when the above elastic connecting member is in use, under the driving action of the linear driving mechanism 4, the bottom wall scraper 32 gradually moves closer to the middle scraper 31. The slider 351 then linearly slides along the limiting chute groove 354 following the bottom wall scraper 32, and the pulley 353 rolls synchronously along the corresponding guiding groove 355. The connecting spring 352 gradually contracts and resets. When the slider 351 slides to align with the self-locking member, the self-locking member automatically locks and clamps the bottom of the slider, so that the bottom wall scraper 32 and the middle scraper 31 are clamped together.

[0041] Please refer to Figures 7 to 9 , the self-locking member includes a locking card shaft 356, an extrusion shaft body 357, a first spring 358, and a second spring 359. The locking card shaft 356 is slidably installed in the middle scraper 31, and its top end can extend upward into the limiting chute groove 354. The first spring 358 is fixedly installed between the bottom end of the locking card shaft 356 and the inside of the middle scraper 31. A bevel groove 3510 adapted to the extrusion shaft body 357 is provided on one side of the extrusion shaft body 357. The extrusion shaft body 357 is located on one side of the locking card shaft 356, and its outer side is slidably connected to the inside of the middle scraper 31. One end of the extrusion shaft body 357 away from the locking card shaft 356 can extend to the outside of the middle scraper 31. The second spring 359 is fixedly installed between the extrusion shaft body 357 and the middle scraper 31. A card hole 3511 adapted to the locking card shaft 356 is provided at the bottom of the slider 351.

[0042] It should be noted that when the above self-locking component is in use, when the intermediate scraper 31 moves away from the protrusion 2 together with the bottom wall scraper 32, the extrusion shaft body 357 is no longer subjected to the extrusion of the protrusion 2. Under the elastic support of the second spring 359, the extrusion shaft body 357 can extend outward from the intermediate scraper 31. The inclined groove 3510 gradually changes under the downward pressure of the extrusion shaft body 357, and under the support of the first spring 358, it synchronously moves upward and extends into the limit sliding groove 354. When the end of the extrusion shaft body 357 is completely separated from the outside of the protrusion 2, the locking shaft 356 just moves upward and is clamped with the clamping hole 3511 at the bottom of the slider 351, thereby locking the position of the slider 351 and preventing the bottom wall scraper 32 from moving relatively when subjected to a reverse force.

[0043] Please refer to Figure 3 and Figure 10 , the linear drive mechanism 4 includes a drive motor 41 and a lead screw. The drive motor 41 is fixedly installed on the side wall of the hopper 1. A protective housing is installed outside the drive motor 41 to protect the drive motor 41. Moving grooves 43 are provided on the opposite side walls of the hopper 1. The lead screw is rotatably installed in one of the moving grooves 43, one end of which is fixedly connected to the drive end of the drive motor 41, and the outside of the lead screw is fixedly connected to the top of one side wall scraper 33. The top end of the other side wall scraper 33 is slidably connected to the side wall of the hopper 1.

[0044] It should be noted that when the above linear drive mechanism 4 is in use, when driving the scraping mechanism 3 to move to scrape and clean the adhered material, by rotating the drive motor 41, the lead screw can be driven to rotate. The connecting block then linearly slides along the moving groove 43 under the driving of the lead screw until the connecting block slides and contacts the inner side wall of the other end of the moving groove 43. After the cleaning is completed, by rotating the drive motor 41 in the reverse direction, the entire scraping mechanism 3 can be driven to move back to its original position.

[0045] Embodiment 2

[0046] Please refer to Figure 11 , the difference from Embodiment 1 is mainly that the self-locking component is an electromagnetic induction structure. The electromagnetic induction structure includes a locking shaft 356, a first spring 358, an electromagnet 3512, and an induction switch 3513. The electromagnet 3512 is located directly below the locking shaft 356 and is fixed to the inside of the intermediate scraper 31. The induction switch 3513 is installed on one side of the intermediate scraper 31 close to the protrusion 2 and is electrically connected to the electromagnet 3512. This induction switch 3513 can be an infrared induction switch 3513. The electromagnet 3512 is circular to adapt to the arrangement of the first spring 358.

[0047] It should be noted that when the scraping mechanism 3 scrapes and cleans the inner wall of the hopper 1, the middle scraper 31 gradually moves away from the protrusion 2. The induction switch 3513 on it detects the position change and sends a signal to the controller. After receiving the signal, the controller starts to control the electromagnet 3512 to cut off the power, so that the electromagnet 3512 no longer generates magnetic force. The locking shaft 356 starts to move upward and reset under the elastic force of the first spring 358, and finally cooperates with the locking hole 3511 at the bottom of the slider 351 to be clamped, thereby automatically locking the bottom wall scraper 32. When the middle scraper 31 moves back to its original position, the electromagnet 3512 is energized, generating a downward attraction force on the bottom end of the locking shaft 356, so that the locking shaft 356 contracts into the middle scraper 31, releasing the locking effect on the bottom wall scraper 32.

[0048] Embodiment III

[0049] Please refer to Figure 12 , the difference from Embodiment I is mainly that the linear drive mechanism 4 is a belt drive structure. The belt drive structure includes a drive motor 41, two sets of belt pulleys 45, and a transmission rod 44. The two sets of belt pulleys 45 are symmetrically arranged on both sides of the side wall of the hopper 1. Each set of belt pulleys 45 consists of two linearly distributed belt pulleys 45. The two belt pulleys 45 are connected by a transmission belt 46. The tops of the two side wall scrapers 33 are respectively fixedly connected to the corresponding transmission belts 46.

[0050] It should be noted that when the belt drive structure is driven, the drive motor 41 rotates to drive the transmission rod 44 to rotate. The two belt pulleys 45 connected to the transmission rod 44 are also driven synchronously. Under the driving action of the transmission belt 46, the four belt pulleys 45 rotate synchronously, and the two transmission belts 46 move synchronously, which can drive the two side wall scrapers 33 to translate respectively, and then can drive the entire scraping mechanism 3 to move horizontally.

[0051] The above describes the embodiments of the specific implementation manner, but this embodiment is not limited to the above specific implementation manner. The above specific implementation manner is only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A dump truck unloading device, characterized in that: include: A scraping mechanism (3) and a linear drive mechanism (4); The scraping mechanism (3) comprises an intermediate scraper (31) adapted to the protrusion (2) in the bucket (1), two bottom wall scrapers (32), two side wall scrapers (33), a connecting plate (34) and a sliding connection assembly (35). The intermediate scraper (31) is movably sleeved on the lower end of the outer side of the protrusion (2), and its bottom is in contact with the inner bottom wall of the bucket (1). Both sides of the intermediate scraper (31) are respectively slidably connected to the two bottom wall scrapers (32) through the sliding connection assembly (35). The bottoms of the two bottom wall scrapers (32) are in contact with the inner bottom wall of the bucket (1). The two bottom wall scrapers (32) are fixed to the two side wall scrapers (33) in a one-to-one correspondence, and one side of the bottom wall scrapers is in contact with the inner side wall of the bucket (1). Both ends of the connecting plate (34) are respectively fixed to the top ends of the two side wall scrapers (33). The sliding connection assembly (35) comprises an elastic connection member and a self-locking member, the two ends of the elastic connection member are respectively fixed to the middle scraper (31) and the bottom scraper (32), the self-locking member is arranged on the middle scraper (31), and is used to lock the bottom scraper (32) that slides to a preset position of the middle scraper (31) by clamping, so that the bottom scraper (32) cannot move relative to the middle scraper (31); The linear drive mechanism (4) is arranged on the side wall of the truck bucket (1), and its driving end is connected to the top end of one of the side wall scrapers (33). The linear drive mechanism (4) drives the scraping mechanism (3) to slide linearly along the inner wall of the truck bucket (1).

2. A dump truck unloading device according to claim 1, characterized in that: The elastic connecting member comprises a slider (351), a connecting spring (352) and two pulleys (353); both sides of the top of the intermediate scraper (31) are provided with limiting slide grooves (354); both opposite side walls of the limiting slide groove (354) are provided with guide grooves (355) adapted to the pulleys (353); both ends of the connecting spring (352) are respectively fixed to the inner wall of the limiting slide groove (354) and one side of the slider (351); the slider (351) is fixedly mounted on the upper end of the bottom wall scraper (32); the two pulleys (353) are respectively mounted on both sides of the slider (351); and the outer sides thereof are respectively in rolling contact with the two guide grooves (355).

3. A dump truck unloading device according to claim 2, characterized in that: The self-locking member is a contact-extrusion type clamping structure, which includes a locking clamping shaft (356), an extrusion shaft body (357), a first spring (358), and a second spring (359). The locking clamping shaft (356) is slidably installed in the middle scraper (31), and its top end can extend upward into the limiting slide groove (354). The first spring (358) is fixedly installed between the bottom end of the locking clamping shaft (356) and the inside of the middle scraper (31). One side of the extrusion shaft body (357) is provided with a spring that is connected to the extrusion shaft body (359). The extrusion shaft (357) is provided with a bevel groove (3510) matched with the locking shaft (357), the extrusion shaft (357) is located on one side of the locking shaft (356), and its outer side is slidably connected with the inside of the intermediate scraper (31), and the end of the extrusion shaft (357) away from the locking shaft (356) can extend to the outside of the intermediate scraper (31), the second spring (359) is fixedly installed between the extrusion shaft (357) and the intermediate scraper (31), and the bottom of the slider (351) is provided with a card hole (3511) matched with the locking shaft (356).

4. A dump truck unloading device according to claim 1, characterized in that: The linear drive mechanism (4) is a screw drive structure, which includes a drive motor (41) and a screw. The drive motor (41) is fixedly mounted on the side wall of the bucket (1). Two opposite side walls of the bucket (1) are each provided with a movable groove (43). The screw is rotatably mounted in one of the movable grooves (43), one end of which is fixed to the drive end of the drive motor (41), and the outer side of the screw is threadedly connected to the top of one of the side wall scrapers (33), and the top of the other side wall scraper (33) is slidably connected to the side wall of the bucket (1).

5. A dump truck unloading device according to claim 1, characterized in that: The self-locking member is an electromagnetic induction structure, which includes a locking card shaft (356), a first spring (358), an electromagnet (3512) and an induction switch (3513). The electromagnet (3512) is located directly below the locking card shaft (356) and is fixed to the inside of the middle scraper (31). The induction switch (3513) is installed on the outside of the protrusion (2) and is electrically connected to the electromagnet (3512).

6. A dump truck unloading device according to claim 2, characterized in that: The linear drive mechanism (4) is a belt transmission structure, which includes a drive motor (41), two pulley (45) groups and a transmission rod (44). The two pulley (45) groups are symmetrically arranged on both sides of the side wall of the bucket (1). The pulley (45) group consists of two linearly distributed pulleys (45). The two pulleys (45) are connected to each other through a transmission belt (46). The top ends of the two side wall scrapers (33) are fixedly connected to the transmission belt (46) on the corresponding side.

7. A dump truck unloading device according to claim 1, characterized in that: The middle scraper (31) is a U-shaped structure adapted to the protrusion (2) inside the truck bucket (1), and the middle section thereof is in an inclined posture.

8. A dump truck unloading device according to claim 1, characterized in that: The middle scraper (31), the two bottom wall scrapers (32) and the two side wall scrapers (33) are all made of high-strength wear-resistant steel, and the contact ends of the three with the inner wall of the truck bucket (1) are provided with grooves.

9. A dump truck unloading device according to claim 4, characterized in that: A protective cover is installed outside the driving motor (41), and the length of the screw rod is adapted to the length of the truck bucket (1).

10. A dump truck unloading device according to claim 5, characterized in that: The induction switch (3513) is an infrared induction switch (3513), and the electromagnet (3512) is in a circular ring shape.

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