Backstop device for tail door of dump truck

Abstract

The utility model discloses a backstop device for a tail door of a dump truck, which comprises a discharge bin and a dust hood arranged at the top of the discharge bin through a support frame, and a telescopic ejector rod device is arranged on the support frame. The telescopic ejector rod device comprises a cylinder body, a telescopic rod arranged on the inner side of the cylinder body in a front-back telescopic mode and a self-adaptive elastic device detachably arranged at the end of the telescopic rod, the self-adaptive elastic device comprises a U-shaped rod, and the two ends of the U-shaped rod are each fixedly provided with a movable sleeve with the outer end open. Limiting grooves are correspondingly formed in the two sides of the movable sleeve, limiting bolts are movably arranged in the limiting grooves, connecting cylinders arranged on the front side of the movable sleeve in a sliding mode are fixedly connected to the limiting bolts, idler wheels are detachably connected to the outer ends of the connecting cylinders, and elastic pieces are arranged between the inner ends of the connecting cylinders and the bottom of the inner side of the movable sleeve. By applying the backstop device for the tail door of the dump truck, the tail door of the dump truck can be effectively opened on the premise of ensuring the safety of operators.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary equipment for opening and closing tailgates of dump trucks, and specifically relates to a tailgate stop device for dump trucks. Background Technology

[0002] Dump trucks are special vehicles with automatic unloading functions, widely used in construction, mining, earthwork engineering and other fields. They use a hydraulic system to tilt the cargo box, enabling rapid unloading of goods and improving transportation efficiency.

[0003] Currently, when unloading materials from tipper trucks, the tailgate latch or the latch of the split tailgate must be manually opened before unloading. When personnel stand at the rear of the truck to open the door, the material in the cargo bed exerts a large pushing force on the tailgate, causing the tailgate latch to be pushed open the moment it is opened. If the personnel opening the door are slow to react, they are very likely to be injured by the impact of the opened tailgate, or even be buried by the material.

[0004] Currently, opening the tailgate of this type of dump truck usually requires a wide open space so that personnel have room to quickly dodge. With the increasing environmental protection requirements, the dust generated during unloading must be collected. In order to collect the dust, relatively enclosed fixed dust hoods and fixed unloading hoppers are usually designed to transfer materials. This makes the unloading environment relatively narrow, greatly increasing the risk of personnel being buried or injured. Utility Model Content

[0005] To address the technical problems existing in the background art, this application provides a tailgate stop device for dump trucks, which can effectively ensure the safety of operators when opening the tailgate of dump trucks.

[0006] The technical solution to the technical problem solved by this utility model is as follows:

[0007] According to one aspect of this application, a tailgate stop device for a dump truck is provided, including a discharge bin and a dust cover mounted on top of the discharge bin via a support frame. A telescopic push rod device is provided on the support frame. The telescopic push rod device includes a cylinder, a telescopic rod retractably disposed inside the cylinder, and an adaptive elastic device detachably disposed at the end of the telescopic rod. The adaptive elastic device includes a U-shaped rod, with movable sleeves with open outer ends fixed at both ends of the U-shaped rod. Limiting grooves are correspondingly formed on both sides of the movable sleeve, and limiting bolts are movably disposed within the limiting grooves. A connecting cylinder slidably disposed on the front side of the movable sleeve is fixed to the limiting bolts. A roller is detachably connected to the outer end of the connecting cylinder, and an elastic element is disposed between the inner end and the bottom inner side of the movable sleeve.

[0008] Furthermore, the elastic element is a spring.

[0009] Furthermore, the telescopic rod is provided with a front connector at its end, and a rear connector adapted to the front connector is provided at the center of the back side of the U-shaped rod, and the front connector and the rear connector are detachably connected.

[0010] Furthermore, a guide plate is provided at the front end of the cylinder body, and a front plate is connected to the front side of the telescopic rod by a locking nut. Guide rods parallel to the cylinder body are fixedly provided on both sides of the front plate, and the guide rods pass through the guide plate and are slidably connected to it.

[0011] Furthermore, a front mounting plate and a rear mounting plate are fixedly provided at both ends of the cylinder body, and the front mounting plate and the rear mounting plate are detachably connected to the support frame.

[0012] Furthermore, the roller is a polyurethane roller.

[0013] Furthermore, the distance between the two ends of the U-shaped rod is 400mm.

[0014] Furthermore, the cylinder body is a pneumatic cylinder.

[0015] Furthermore, the cylinder block is connected to an air circuit system, which includes an air source, a ball valve, a filter pressure reducing valve, a ball valve, a reversing valve, and a quick-connect speed control valve connected in sequence through a grounding pipe. The quick-connect speed control valve is connected to the cylinder block through a pipe.

[0016] Furthermore, the reversing valve is a three-position four-way manual reversing valve, which is connected to a muffler and is connected to one of the quick-connect speed control valves through two pipelines. The two quick-connect speed control valves are connected to the cylinder body through pipelines.

[0017] Compared with the prior art, the tailgate stop device for dump trucks described in this application has the following advantages:

[0018] (1) This application sets up a telescopic push rod device, preferably a cylinder, and utilizes the compressibility of gas to make the telescopic push rod device have a buffering performance to reduce the impact of the tail door of the dump truck. After the dump truck stops, the telescopic rod is extended to make the adaptive elastic device hold the tail door of the truck. After the operator opens the bolt of the tail door, the tail door will not be opened directly due to the action of the telescopic push rod device. After the operator retreats to a safe position (tail door opening range), the telescopic rod is slowly retracted to drive the adaptive elastic device to move slowly, so that the tail door opens slowly and the material flows out. After the adaptive elastic device is completely disengaged from the tail door, the tail door can be fully opened and the dump truck can be tipped over for unloading.

[0019] (2) By setting the telescopic top rod device on the support frame on the top of the unloading hopper where the dust cover is installed, the material flow of the dump truck flows downward. After the telescopic top rod device is fully retracted, it can be hidden within the coverage area of ​​the dust cover and will not interfere with the position of the truck box during the unloading process.

[0020] (3) This application uses a U-shaped adaptive elastic device and rollers at both ends of the U-shaped rod to ensure that the tailgate opens slowly as the cylinder retracts during the retraction of the telescopic push rod device. The top of the device and the uneven car door are subject to rolling friction. The double roller design ensures that when the car changes position left or right, both doors will be reliably held in place by the device. The preferred 400mm spacing ensures that the rollers are placed on the relatively flat parts of the left and right doors of the car. The movable sleeve and connecting cylinder are connected by limiting grooves and limiting bolts. With the setting of elastic elements, the rollers can adapt to a large range of buffer changes during the rolling process.

[0021] (4) This application provides guide plates and front plates on the cylinder body and the end of the telescopic rod respectively, and slides guide rods on both sides. This not only increases the strength of the cylinder rod and avoids bending caused by the self-weight torque at the end of the long-stroke telescopic rod, thus preventing the cylinder from being damaged by impact, but also ensures that the position of the cylinder head elastic adaptive device remains relatively constant and does not deflect during the entire operation of the cylinder. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the layout structure of this application;

[0023] Figure 2 This is a top view of the layout structure of this application (the opening stroke of the rear door of the carriage).

[0024] Figure 3 This is a three-dimensional structural diagram of the telescopic top rod device in this application;

[0025] Figure 4 This is a front view structural schematic diagram of the telescopic top rod device in this application;

[0026] Figure 5 This is a top view of the telescopic rod device in this application;

[0027] Figure 6 This is a schematic diagram of the adaptive elastic device in this application;

[0028] Figure 7 This is a schematic diagram of the movable sleeve in this application;

[0029] Figure 8 This is a schematic diagram of the gas path system in this application;

[0030] In the diagram: 1. Unloading hopper; 2. Support frame; 3. Dust hood; 4. Telescopic top rod device; 41. Cylinder body; 42. Telescopic rod; 43. Adaptive elastic device; 431. U-shaped rod; 432. Rear connector; 433. Movable sleeve; 434. Elastic element; 435. Connecting cylinder; 436. Roller; 437. Limit bolt; 438. Limit groove; 44. Front mounting plate; 45. Rear mounting plate; 46. Front plate; 47. Locking nut; 48. Front connector; 49. Guide plate; 410. Guide rod; 5. Unloading hopper; 6. Car body; 7. Tailgate; 8. Ball valve; 9. Filter pressure reducing valve; 10. Reversing valve; 11. Muffler; 12. Quick-connect speed control valve; 13. Wheel stop; 14. Wheel; 15. Dump truck; 16. Air source. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those of ordinary skill in the art to which this disclosure pertains. The terms "upper," "lower," "left," "right," "front," "back," "inside," and "outside" used in the specification and claims of this patent application are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly. Any aspects not detailed in the present utility model are well-known technologies to those skilled in the art.

[0032] like Figure 1-8 As shown, this application discloses a tailgate stop device for dump trucks, which is used to hold the tailgate 7 of the upper compartment 6 of the dump truck 15 at the position of the unloading bin 1, so as to prevent the tailgate from suddenly opening due to the impact of materials during unloading and causing safety risks to the operators.

[0033] The bottom of the unloading bin 1 is a unloading hopper 5 for unloading materials, and the top is equipped with several dust removal hoods 3 through a support frame 2. Wheel stops 13 can be installed on the front road to position the wheels 14 of the dump truck 15 and ensure that the stopping positions of the dump truck 15 are basically consistent.

[0034] The tailgate stop device of the dump truck in this application includes a telescopic push rod device 4 installed on the support frame 2. The telescopic push rod device 4 includes a cylinder 41, a telescopic rod 42 that can be telescopically installed inside the cylinder 41, and an adaptive elastic device 43 that can be detachably installed at the end of the telescopic rod 42. The adaptive elastic device 43 is used to hold the tailgate 7 of the dump truck 15 cargo box 6 when the dump truck is unloading. The cylinder 41 is preferably a cylinder, but a hydraulic cylinder or the like can also be used. This embodiment is described using a cylinder. By utilizing the compressibility of gas, the telescopic push rod device 4 has a buffering performance.

[0035] In this embodiment, the adaptive elastic device 43 is U-shaped and includes a U-shaped rod 431. Two movable sleeves 433 with open outer ends are fixed at the two ends of the U-shaped rod 431. Each movable sleeve 433 has a limiting groove 438 on both sides. A limiting bolt 437 is movably arranged in each pair of corresponding limiting grooves 438. A connecting cylinder 435 that is slidably arranged on the front side of the movable sleeve 433 is fixed to the limiting bolt 437. A roller 436 is detachably connected to the outer end of the connecting cylinder 435. An elastic element 434 is arranged between the inner end and the bottom of the inner side of the movable sleeve 433. The roller 436 is preferably a polyurethane roller, which is convenient to manufacture and replace. When the U-shaped adaptive elastic device 43 presses against the tailgate, and the telescopic push rod device 4 slowly retracts and the tailgate slowly opens, there is rolling friction between the adaptive elastic device 43 and the uneven tailgate. The double roller design ensures that when the car changes position left or right, both tailgates will be reliably pressed against by the device. The distance between the two ends of the U-shaped rod 431 can preferably be about 400mm, which effectively ensures that the roller 436 presses against the relatively flat parts of the two tailgates 7 on the left and right sides of the vehicle body.

[0036] As a preferred embodiment, the elastic element 434 is a spring, and the compression stroke is set according to actual needs. For example, a spring with a compression stroke of 50mm, a spring wire diameter of 5mm, and a length of 100mm can effectively ensure that the roller 436 can adapt to a large range of changes during the rolling process when it is impacted by the tailgate 7.

[0037] To facilitate the connection between the telescopic rod 42 and the adaptive elastic device 43, in a preferred embodiment, the end of the telescopic rod 42 is provided with a front connector 48, and the center of the back side of the U-shaped rod 431 is provided with a rear connector 432 that is compatible with the front connector 48. The front connector 48 and the rear connector 432 can be provided with internal and external threads respectively and can be detachably connected.

[0038] To facilitate the installation of the entire stop device, a front mounting plate 44 and a rear mounting plate 45 are fixedly installed at both ends of the cylinder body 41, and the front mounting plate 44 and the rear mounting plate 45 are threadedly connected to the support frame 2.

[0039] In a preferred embodiment, the cylinder block 41 is connected to an air circuit system, which includes an air source 16, a ball valve 8, a filter pressure reducing valve 9, a ball valve 8, a reversing valve 10, and a quick-connect speed control valve 12 connected in sequence through a grounding pipe. The quick-connect speed control valve 12 is connected to the cylinder block 41 through a pipe. The reversing valve 10 is a three-position four-way manual reversing valve, which is connected to a muffler 11. It is connected to one quick-connect speed control valve 12 through two pipes, and the two quick-connect speed control valves 12 are connected to the rod chamber and rodless chamber of the cylinder block 41 through pipes, respectively. This embodiment effectively ensures the cleanliness and stability of the air source during the operation of the entire system by setting a filter pressure reducing valve, so that the air circuit system is not affected by the fluctuation of the air source pressure of the entire pipeline network. The reversing valve 10 adopts a three-position four-way manual reversing valve, which is simple and reliable. The neutral position cut-off function can ensure that the cylinder stops at any position. After the cylinder is pushed to the end, the handle is positioned in the neutral position, which can also prevent the compressed air in the rodless chamber of the cylinder from blocking the door in case of sudden air interruption during the door opening operation, thus preventing the door from losing the cylinder thrust and reducing the safety risk to the operator. The quick-connect speed regulating valve in the air circuit system effectively ensures that the speed of the cylinder action on site is adjustable. The main pipeline of the entire air circuit system can be laid with galvanized steel pipes, and the air circuit after the valve can be connected to PU hoses with quick-connect connectors, which is relatively low-cost and saves costs.

[0040] In use, the telescopic top rod device 4 is installed on the support frame 2. After the wheels 14 of the dump truck 15 are blocked by the wheel stop 13, the telescopic top rod device 4 is operated to extend the telescopic rod 42 in the cylinder 41 and make the two rollers 436 of the adaptive elastic device 43 press against the tailgate 7 of the truck body 6. At this time, after the operator opens the bolt of the tailgate 7, the tailgate will not open due to the presence of the telescopic top rod device 4. After the personnel have evacuated to a safe position, the telescopic rod is operated to retract. As the telescopic rod retracts slowly, the tailgate opens slowly and the material flows out. As the two rollers 436 of the adaptive elastic device 43 completely disengage from the tailgate, the tailgate is fully opened and the dump truck can begin to tip over and unload.

[0041] Example 2:

[0042] Because long-stroke cylinders are prone to generating deflection torque during operation, the telescopic rod inside the cylinder body deflects at an angle, which in turn causes the adaptive elastic device at the head of the telescopic rod to deflect, resulting in obstruction of the uneven tailgate and the telescopic push rod device 4 itself. Therefore, based on embodiment 1, a guide plate 49 is provided at the front end of the cylinder body 41, and a front plate 46 is connected to the front side of the telescopic rod 42 through a locking nut 47. Guide rods 410 parallel to the cylinder body 41 are fixedly provided on both sides of the front plate 46, and the guide rods 410 pass through the guide plate 49 and are slidably connected to it. The guide rods designed on both sides of the cylinder body serve two purposes: first, to increase the strength of the telescopic rod and prevent it from bending due to its own weight torque at the end of the long-stroke cylinder, thereby preventing the cylinder rod from being damaged by impact; second, to ensure that the position of the adaptive elastic device at the cylinder head remains relatively constant and does not deflect during the entire operation of the cylinder, increasing the stability of the entire device during operation.

Claims

1. A tailgate stop device for a dump truck, comprising a discharge bin (1) and a dust cover (3) mounted on top of the discharge bin (1) via a support frame (2), characterized in that: The support frame (2) is provided with a telescopic top rod device (4). The telescopic top rod device (4) includes a cylinder (41), a telescopic rod (42) that can be telescopically arranged inside the cylinder (41), and an adaptive elastic device (43) that can be detachably arranged at the end of the telescopic rod (42). The adaptive elastic device (43) includes a U-shaped rod (431). The two ends of the U-shaped rod (431) are respectively fixed with movable sleeves (433) with open outer ends. The movable sleeve (433) has corresponding limit grooves (438) on both sides. Limit bolts (437) are movably arranged in the limit grooves (438). A connecting cylinder (435) that is slidably arranged in front of the movable sleeve (433) is fixed on the limit bolt (437). A roller (436) is detachably connected to the outer end of the connecting cylinder (435). An elastic element (434) is arranged between the inner end and the bottom of the inner side of the movable sleeve (433).

2. The tailgate stop device for a dump truck according to claim 1, characterized in that: The elastic element (434) is a spring.

3. The tailgate stop device for a dump truck according to claim 1, characterized in that: The telescopic rod (42) is provided with a front connector (48) at its end, and a rear connector (432) adapted to the front connector (48) is provided at the center of the back side of the U-shaped rod (431). The front connector (48) and the rear connector (432) are detachably connected.

4. The tailgate stop device for a dump truck according to claim 1, characterized in that: The cylinder body (41) is provided with a guide plate (49) at the front end. The front side of the telescopic rod (42) is connected to a front plate (46) by a locking nut (47). The front plate (46) is provided with guide rods (410) that are parallel to the cylinder body (41) on both sides. The guide rods (410) pass through the guide plate (49) and are slidably connected to it.

5. A tailgate stop device for dump trucks according to claim 1, characterized in that: The cylinder body (41) is fixedly provided with a front mounting plate (44) and a rear mounting plate (45) at both ends, and the front mounting plate (44) and the rear mounting plate (45) are detachably connected to the support frame (2).

6. A tailgate stop device for dump trucks according to claim 1, characterized in that: The roller (436) is a polyurethane roller.

7. A tailgate stop device for dump trucks according to claim 1, characterized in that: The distance between the two ends of the U-shaped rod (431) is 400mm.

8. A tailgate stop device for dump trucks according to any one of claims 1-5, characterized in that: The cylinder body (41) is a gas cylinder.

9. A tailgate stop device for a dump truck according to claim 8, characterized in that: The cylinder (41) is connected to an air circuit system, which includes an air source (16), a ball valve (8), a filter pressure reducing valve (9), a reversing valve (10), and a quick-connect speed control valve (12) connected in sequence through a grounding pipe. The quick-connect speed control valve (12) is connected to the cylinder (41) through a pipe.

10. A tailgate stop device for a dump truck according to claim 9, characterized in that: The reversing valve (10) is a three-position four-way manual reversing valve, which is connected to a muffler (11). It is connected to one of the quick-connect speed control valves (12) through two pipelines. The two quick-connect speed control valves (12) are connected to the cylinder body (41) through pipelines.

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