A self-unloading vehicle box rear door locking device and a self-unloading vehicle box

Abstract

The utility model provides a kind of self-unloading vehicle box rear door locking device and self-unloading vehicle box, it is related to vehicle box door locking field, the scheme used is: including drive unit one, the drive unit one can drive the rotation of pivot and reverse rotation;Drive unit two, the drive unit two includes shell, piston is movably arranged in the shell, the piston separates the shell into chamber one and chamber two, spring is arranged in the chamber one between piston and the bottom of shell, the chamber two is provided with air inlet one, the piston can drive push rod axial movement, the push rod extends the shell, the push rod is connected with the pivot by swing arm two, the drive unit two can drive the rotation of pivot and reverse rotation.The utility model can greatly improve work reliability.

Description

Technical Field

[0001] This utility model relates to the field of truck bed door locking, and in particular to a truck bed rear door locking device and a truck bed of a dump truck. Background Technology

[0002] Most dump truck tailgate locking devices on the market use either chain-type or rigid lever-type locking methods. Both of these methods require the truck bed to be raised to a certain angle before the tailgate can be opened, resulting in a slow opening speed. Moreover, during driving, the locking hooks may sometimes disengage due to poor road conditions or sudden braking, causing the truck bed to bounce significantly. Chain-type locking devices may also loosen after a period of use, leading to an insecure lock.

[0003] In the prior art, a pneumatic door lock device is disclosed, including a carriage fixed beam, a lock head, a lock seat, and a carriage door. The lock seat is fixed on the carriage fixed beam. The lock head body is provided with a fixed structure that can rotate around the lock seat. The working end of the lock head is engaged with and restricts the carriage door installed on the carriage fixed beam. The power connection end of the lock head is connected to a double diaphragm brake air chamber that can drive the lock head to rotate around the lock seat. The piston rod of the double diaphragm brake air chamber is fixed to the power connection end of the lock head. When the air reservoir is supplied with air through the upper opening of the ferrule-type tapered thread right-angle connector, the diaphragm in the upper air chamber of the double diaphragm brake air chamber expands and pushes the piston rod forward. When the air reservoir is supplied with air through the lower opening of the ferrule-type tapered thread right-angle connector, the diaphragm in the lower air chamber of the double diaphragm brake air chamber expands and pushes the piston rod backward.

[0004] However, when using the above technical solution, the locking power comes from the dual diaphragm brake chamber. When the dual diaphragm brake chamber malfunctions or the air circuit malfunctions, locking and unlocking cannot be achieved, resulting in a reduction in the reliability of the entire device. Utility Model Content

[0005] In order to solve the technical problem of low reliability of dump truck bed door locking devices in the prior art, this utility model provides a dump truck bed rear door locking device and a dump truck bed, which can greatly improve the reliability of operation.

[0006] In a first aspect, this utility model provides a locking device for the rear door of a dump truck bed to solve the above-mentioned technical problems. The device includes a rotating shaft with a locking hook, and further includes: a first drive unit, which includes a cylinder and a solenoid valve, the solenoid valve being a five-position two-way solenoid valve connected to the cylinder; a piston rod of the first drive unit connected to the rotating shaft via a rocker arm; and a second drive unit, which includes a housing with a piston axially movable within it, dividing the housing into a first chamber and a second chamber. A spring is disposed within the first chamber between the piston and the bottom of the housing. The second chamber has an air inlet; the piston drives a push rod axially, the push rod extending out of the housing, and the push rod is connected to the rotating shaft via a rocker arm; the second drive unit can drive the rotating shaft to rotate in both directions.

[0007] This invention achieves synchronous driving of the rotating shaft by setting up drive unit one and drive unit two, realizing dual protection and improving the reliability of locking and unlocking. At the same time, drive unit one and drive unit two achieve locking through different power forms, further improving the locking reliability of this device.

[0008] Furthermore, a partition is provided inside the second chamber, which divides the second chamber into a front chamber and a rear chamber. The front chamber is provided with an air inlet two, and the rear chamber is provided with an air inlet one. An elastic diaphragm is provided inside the front chamber, and the center of the elastic diaphragm can move back and forth within the front chamber. The center of the elastic diaphragm is connected to the push rod. A drive shaft is provided on the piston, which passes through the partition and can be connected to the center of the elastic diaphragm.

[0009] This invention divides the chamber into a front chamber and a rear chamber and adds an elastic diaphragm, which allows the push rod to be subjected to air pressure on top of the spring force, increasing the force on the rotating shaft and further improving the reliability of locking.

[0010] Furthermore, the first air inlet is connected to the second solenoid valve, and the second air inlet is connected to the third solenoid valve.

[0011] Furthermore, a relay valve is also connected between the second solenoid valve and the first air inlet.

[0012] This invention accelerates the inflation and deflation speed of the second drive unit by using a relay valve, shortening the reaction time and enabling rapid locking and unlocking.

[0013] Furthermore, the first solenoid valve, the second solenoid valve, and the third solenoid valve are all connected to a pressure regulating valve, which is used to connect to a gas source.

[0014] This invention can adjust the input air pressure by setting a pressure regulating valve, thereby adjusting the torque on the rotating shaft and ensuring reliable locking even under single power.

[0015] Furthermore, the locking hook has an L-shaped structure, and the locking hook includes a connecting part and a locking part. The width of the locking part increases from the end of the locking part to the head.

[0016] Furthermore, the locking hook is provided with at least three.

[0017] Furthermore, the wide ends of the first and second swing arms are connected to the rotating shaft, and the narrow ends of the first and second swing arms are connected to the first and second drive units, respectively. The width of the first and second swing arms increases from the narrow end to the wide end.

[0018] Secondly, this utility model also provides a dump truck body, including a rear door and a bottom plate. A rear crossbeam is provided at the rear of the bottom plate, and two longitudinal beams are arranged in parallel on the bottom plate. It also includes the aforementioned dump truck body rear door locking device. The rotating shaft is rotatably mounted on the rear crossbeam, and the cylinder and the drive unit are respectively mounted on the corresponding longitudinal beams through corresponding mounting seats.

[0019] Furthermore, a pad is provided on the rear door, and the lock hook abuts against the pad.

[0020] This invention avoids impact and wear on the rear door by setting a pad.

[0021] As can be seen from the above technical solutions, this utility model has the following advantages: This utility model provides a rear door locking device for a dump truck and a dump truck body. By setting up a first drive unit and a second drive unit to achieve synchronous drive of the rotating shaft, dual protection is achieved, improving the reliability of locking and unlocking. Simultaneously, the first and second drive units achieve locking through different power sources, further enhancing the locking reliability of the device. By dividing the second chamber into a front chamber and a rear chamber and adding an elastic diaphragm, the push rod experiences a superimposed air pressure effect on top of the spring force, increasing the force on the rotating shaft and further improving locking reliability. A relay valve accelerates the inflation and deflation speed of the second drive unit, shortening the reaction time and achieving rapid locking and unlocking. A pressure regulating valve adjusts the input air pressure, thereby adjusting the torque on the rotating shaft, ensuring reliable locking even with a single power source. A pad is included to prevent the locking hook from causing impact wear on the rear door. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0024] Figure 2 This is a schematic diagram of the assembly structure of the rotating shaft, swing arm one, swing arm two and locking hook in a specific embodiment of this utility model.

[0025] Figure 3 This is a diagram showing the extended state of the push rod of the second drive unit in a specific embodiment of this utility model.

[0026] Figure 4 This is a diagram showing the retraction of the push rod of the second drive unit in a specific embodiment of this utility model.

[0027] Figure 5 This is a pneumatic principle diagram of a specific embodiment of the present invention.

[0028] Figure 6 This is a structural schematic diagram of a second specific embodiment of the present utility model.

[0029] Figure 7 This is a schematic diagram of the assembly structure of the rear door locking device and the longitudinal beam of the dump truck in the second specific embodiment of this utility model.

[0030] In the diagram: 1. Rear door; 2. Drive unit one; 3. Drive unit two; 301. Spring; 302. Piston; 303. Housing; 304. Chamber one; 305. Air inlet two; 306. Elastic diaphragm; 307. Push rod; 308. Return spring; 309. Air inlet one; 310. Drive shaft; 311. Partition; 312. Chamber two; 313. Front chamber; 314. Rear chamber; 4. Longitudinal beam; 5. Locking hook; 501. Locking part; 502. Connecting part; 6. Rotating shaft; 7. Support seat; 9. Swing arm one; 10. Swing arm two; 11. Mounting seat; 12. Base plate; 13. Rear crossbeam; 14. Pad plate; 15. Air source; 16. Pressure regulating valve; 17. Solenoid valve one; 18. Solenoid valve two; 19. Relay valve; 20. Solenoid valve three; 21. Cylinder. Detailed Implementation

[0031] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent. Specific Implementation Method 1 like Figure 1 and Figure 2 As shown, this specific embodiment provides a locking device for the rear door 1 of a dump truck, including a rotating shaft 6, a locking hook 5, a drive unit 2, and a drive unit 3. The locking hook 5 is welded onto the rotating shaft 6. The drive unit 2 includes a cylinder 21 and a solenoid valve 17. The solenoid valve 17 is connected to the cylinder 21 and is a five-position two-way solenoid valve. The five-position two-way solenoid valve can realize the reversing movement of the piston rod of the cylinder 21. The piston rod of the drive unit 2 is connected to the rotating shaft 6 through a rocker arm 9. The drive unit 2 can drive the rotating shaft 6 to rotate forward and backward. When the piston rod of the drive unit 2 extends, it can drive the rotating shaft 6 to rotate forward and lock through the rocker arm 9. When it retracts, it drives the rotating shaft 6 to rotate backward and unlock. The drive unit 3 includes a housing 303, and a piston 302 is axially movable inside the housing 303. The piston 302 divides the housing into chamber one 304 and chamber two 312. A spring 301 is provided in chamber one 304 and between the piston 302 and the bottom of the housing 303. The extension and retraction of the spring 301 drives the piston 302 to move axially. Chamber two 312 is provided with an air inlet 309. The piston 302 can drive the push rod 307 to move axially. The push rod 307 extends out of the housing 303 and is connected to the rotating shaft 6 through a rocker arm 10. The drive unit 3 can drive the rotating shaft 6 to rotate forward and backward. When gas is introduced into the air inlet 309, it can push the piston 302 to move towards the spring 301, so that the spring 301 is compressed, the push rod 307 retracts, and the housing is unlocked. When no gas enters, the push rod 307 extends under the action of the spring 301, driving the rotating shaft 6 to rotate forward to lock.

[0033] This specific embodiment achieves synchronous driving of the rotating shaft 6 by setting up drive unit 1 2 and drive unit 2 3, realizing dual protection and improving the reliability of locking and unlocking. At the same time, drive unit 1 2 achieves pneumatic locking through cylinder 21, and drive unit 2 3 provides mechanical locking force with the elasticity of spring 301. Locking is achieved through different power forms, avoiding the same failure rate when using the same power form, and further improving the locking reliability of this device.

[0034] like Figure 3 and Figure 4 As shown, to further enhance the reliability of the locking of the drive unit 3, a partition 311 is provided inside the second chamber 312, dividing the second chamber 312 into a front chamber 313 and a rear chamber 314. The front chamber 313 is provided with an air inlet 305, and the rear chamber 314 is provided with an air inlet 309. An elastic diaphragm 306 is provided inside the front chamber 313, and the center of the elastic diaphragm 306 can move back and forth within the front chamber 313. The center of the elastic diaphragm 306 is connected to the push rod 307. A drive shaft 310 is provided on the piston 302, which passes through the partition 311 and can be connected to the center of the elastic diaphragm 306. The gas entering through the second air inlet 305 can push the elastic diaphragm 306 to deform, causing its center to move forward (the push rod 307 extends forward). The air pressure acts on the elastic diaphragm 306. This increases the force on the push rod 307. In this specific embodiment, the elastic diaphragm 306 is made of nitrile rubber and has a bowl-shaped structure. The edge of the elastic diaphragm 306 and the inner wall of the front cavity 313 are vulcanized and integrated. A return spring 308 is provided between the elastic diaphragm 306 and the front inner wall of the front cavity 313. The return spring 308 is sleeved on the push rod 307 and connected to the push rod 307. A through hole is provided in the middle of the partition plate 311, and the drive shaft 310 passes through the through hole. With this arrangement, when the first air inlet 309 does not take in air while the second air inlet 305 takes in air, the push rod 307 is subjected to the dual thrust of the elastic diaphragm 306 and the drive shaft 310, which increases the force on the rotating shaft 6 and enhances the locking effect. When the second air inlet 305 does not take in air while the first air inlet 309 takes in air, the drive shaft 310 retracts, the elastic diaphragm 306 returns to its shape, and the push rod 307 retracts, releasing the lock.

[0035] like Figure 5 As shown, in order to control the operation of the drive unit 2 3, the air inlet 1 309 is connected to the solenoid valve 2 18, the air inlet 2 305 is connected to the solenoid valve 3 20, and the solenoid valve 2 18 and the air inlet 1 309 are also connected to the relay valve 19; the relay valve 19 accelerates the inflation and deflation speed of the drive unit 2 3, shortens the reaction time, and realizes rapid locking and unlocking.

[0036] like Figure 5 As shown, when drive unit 12 or drive unit 23 fails, only one power source drives the rotating shaft 6 to rotate and remain locked. To ensure locking reliability under single power conditions, solenoid valve 17, solenoid valve 28 and solenoid valve 3 are all connected to pressure regulating valve 16. Pressure regulating valve 16 is used to connect to air source 15. By setting pressure regulating valve 16, the input air pressure can be adjusted, thereby adjusting the torque on the rotating shaft 6, ensuring reliable locking even under single power conditions.

[0037] like Figure 2 As shown, in this specific embodiment, to ensure structural strength, the locking hook 5 has an L-shaped structure. The locking hook 5 includes a connecting part 502 and a locking part 501. The connecting part 502 is welded to the rotating shaft 6, and the locking part 501 can abut against the rear door 1. The width of the locking part 501 increases from the end to the head. At the same time, the wide ends of the first swing arm 9 and the second swing arm 10 are welded to the rotating shaft 6. The narrow ends of the first swing arm 9 and the second swing arm 10 are rotatably connected to the piston rod of the first drive unit 2 and the push rod of the second drive unit 3 respectively through pins. The width of the first swing arm 9 and the second swing arm 10 increases from the narrow end to the wide end. Furthermore, at least three locking hooks 5 are provided. In this specific embodiment, four locking hooks 5 are provided.

[0038] The locking device for the rear door 1 of this dump truck, under the coordinated operation of drive unit 2 and drive unit 3, works as follows: When locked:

[0039] When locked, if only drive unit 2 can work normally, drive unit 3 is not controlled, spring 301 always remains in a longer state, and push rod 307 always remains in a locked state.

[0040] When unlocking:

[0041] When locked, if only drive unit 2 can work normally, drive unit 3 is not controlled, spring 301 always remains in a longer state, and push rod 307 always remains in a locked state.

[0042] During unlocking, when only drive unit 2 can work normally, drive unit 3 is uncontrolled, spring 301 remains in a long state, push rod 307 remains in a locked state, solenoid valve 17 is in a reverse conduction state, and pressure regulating valve 16 increases the air pressure to overcome the elastic force of spring 301 in drive unit 3, so that when the rotating shaft 6 rotates in the opposite direction to unlock, it drives push rod 307 to retract, which in turn causes transmission shaft 310 to retract and spring 301 to be compressed. During and after unlocking, solenoid valve 17 always maintains a high intake air pressure. Specific Implementation Method Two like Figure 6 and Figure 7As shown, this specific embodiment provides a dump truck body, including a rear door 1 and a bottom plate 12. A rear crossbeam 13 is provided at the rear of the bottom plate 12, and two longitudinal beams 4 are arranged in parallel on the bottom plate 12. It also includes a dump truck body rear door locking device according to the first embodiment. The rotating shaft 6 is rotatably mounted on the rear crossbeam 13 through two support seats 7. The cylinder 21 and the drive unit 2 3 are respectively mounted on the corresponding longitudinal beams 4 through corresponding mounting seats 11.

[0044] like Figure 6 As shown, further, a pad 14 is provided on the rear door 1, and the locking hook 5 abuts against the pad 14 to prevent the rear door 1 from being damaged by the impact of the locking hook 5.

[0045] As can be seen from the above specific embodiments, this utility model has the following beneficial effects: 1. By setting up drive unit 1 2 and drive unit 2 3 to achieve synchronous drive of the rotating shaft 6, a dual guarantee is achieved, which improves the reliability of locking and unlocking. At the same time, drive unit 1 2 and drive unit 2 3 achieve locking through different power forms, which further improves the locking reliability of this device. 2. By dividing chamber 2 312 into a front chamber and a rear chamber and adding an elastic diaphragm, the push rod is subjected to air pressure on the basis of spring force, which increases the force on the rotating shaft 6 and further improves the reliability of locking. 3. By accelerating the inflation and deflation speed of the drive unit 2 3 through the relay valve 19, the reaction time is shortened, and rapid locking and unlocking are achieved; 4. By setting the pressure regulating valve 16, the input air pressure can be adjusted, thereby adjusting the torque on the rotating shaft 6, ensuring reliable locking even under single power conditions; 5. By setting a pad 14, the locking hook 5 is prevented from causing impact and wear to the rear door 1.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A locking device for the rear door of a dump truck bed, comprising a rotating shaft (6), wherein a locking hook (5) is provided on the rotating shaft (6), characterized in that, Also includes: Drive unit 1 (2), the drive unit 1 (2) includes a cylinder (21) and a solenoid valve 1 (17), the solenoid valve 1 (17) is connected to the cylinder (21), the solenoid valve 1 (17) is a five-position two-way solenoid valve, the piston rod of the drive unit 1 (2) is connected to the rotating shaft (6) through a rocker arm 1 (9), the drive unit 1 (2) can drive the rotating shaft (6) to rotate in the forward direction and in the reverse direction; Drive unit two (3) includes a housing (303), a piston (302) is axially movable inside the housing (303), the piston (302) divides the housing (303) into a first chamber (304) and a second chamber (312), a spring (301) is provided in the first chamber (304) and between the piston (302) and the bottom of the housing (303), the second chamber (312) is provided with an air inlet (309), the piston (302) can drive the push rod (307) to move axially, the push rod (307) extends out of the housing (303), the push rod (307) is connected to the rotating shaft (6) through a swing arm two (10), and the drive unit two (3) can drive the rotating shaft (6) to rotate in the forward direction and in the reverse direction.

2. The dump truck cargo box rear door locking device as described in claim 1, characterized in that, A partition (311) is provided inside the second chamber (312), which divides the second chamber (312) into a front chamber (313) and a rear chamber (314). The front chamber (313) is provided with an air inlet (305), and the rear chamber (314) is provided with an air inlet (309). An elastic diaphragm (306) is provided inside the front chamber (313). The center of the elastic diaphragm (306) can move back and forth inside the front chamber (313). The center of the elastic diaphragm (306) is connected to the push rod (307). A drive shaft (310) is provided on the piston (302). The drive shaft (310) passes through the partition (311) and can be connected to the center of the elastic diaphragm (306).

3. The dump truck cargo box rear door locking device as described in claim 2, characterized in that, The first air inlet (309) is connected to the second solenoid valve (18), and the second air inlet (305) is connected to the third solenoid valve (20).

4. The dump truck cargo box rear door locking device as described in claim 3, characterized in that, A relay valve (19) is also connected between the second solenoid valve (18) and the first air inlet (309).

5. The dump truck cargo box rear door locking device as described in claim 4, characterized in that, The first solenoid valve (17), the second solenoid valve (18), and the third solenoid valve (20) are all connected to the pressure regulating valve (16), which is used to connect to the gas source.

6. The dump truck cargo box rear door locking device as described in any one of claims 1-5, characterized in that, The locking hook (5) has an L-shaped structure and includes a connecting part (502) and a locking part (501). The width of the locking part (501) increases from the end of the locking part (501) to the head.

7. The dump truck cargo box rear door locking device as described in claim 6, characterized in that, The locking hook (5) is provided with at least three.

8. The dump truck cargo box rear door locking device as described in claim 7, characterized in that, The wide ends of the first swing arm (9) and the second swing arm (10) are connected to the rotating shaft (6), and the narrow ends of the first swing arm (9) and the second swing arm (10) are connected to the first drive unit (2) and the second drive unit (3) respectively. The width of the first swing arm (9) and the second swing arm (10) increases from the narrow end to the wide end.

9. A dump truck body, comprising a rear door (1) and a floor plate (12), wherein a rear crossbeam (13) is provided at the rear of the floor plate (12), and two longitudinal beams (4) are arranged parallel to each other on the floor plate (12), characterized in that, It also includes the dump truck rear door locking device as described in claim 8, wherein the rotating shaft (6) is rotatably mounted on the rear crossbeam (13), and the cylinder (21) and the second drive unit (3) are respectively mounted on the corresponding longitudinal beam (4) via corresponding mounting seats (11).

10. The dump truck body as described in claim 9, characterized in that, A pad (14) is provided on the rear door (1), and the lock hook (5) abuts against the pad (14).

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