A rear door mechanism for a flatbed dump truck

Abstract

The application discloses a rear door mechanism of a flat push self-unloading vehicle, which comprises rear doors which are arranged in a slope surface and are attached to a tail frame of a box body of the flat push self-unloading vehicle, two rear door opening connecting arms which are arranged on the top of the tail frame of the box body of the flat push self-unloading vehicle and are located on the left and right sides of the tail frame, and two rear door oil cylinders which are arranged on the left and right sides of the tail frame of the box body of the flat push self-unloading vehicle; one end of each rear door opening connecting arm is hinged to the box body of the flat push self-unloading vehicle, and the other end is hinged to the rear door; one end of each rear door oil cylinder is hinged to one rear door opening connecting arm, and the other end is hinged to one rear stand column of the tail frame of the box body of the flat push self-unloading vehicle; the rear stand column is provided with two rear stand columns which are arranged on the tail of the left and right side plates of the box body of the flat push self-unloading vehicle; one box body lock hook is further arranged on each rear stand column, one rear door lock hook is arranged on the left and right sides of the rear door respectively, and each rear door lock hook is locked and matched with one box body lock hook. The application has the advantages of simple structure, convenient operation and safe work.

Description

Technical Field

[0001] This invention relates to the field of dump truck rear door technology, specifically to a push-pull dump truck rear door mechanism. Background Technology

[0002] Currently, the rear door of domestic push-pull dump trucks uses a two-step opening mechanism: locking and opening. This design can easily damage the rear door mechanism if the locking hook is not opened during unloading or if the opening sequence is incorrect. Summary of the Invention

[0003] To address the problems in the background art, the purpose of this invention is to provide a rear door mechanism for a push-pull dump truck that is simple in structure, safe in operation, and can effectively avoid damage to the rear door mechanism caused by disordered rear door lock hook and rear door opening sequence.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A rear door mechanism for a push-pull dump truck includes a rear door that is inclinedly fitted to the rear frame of the push-pull dump truck body, and also includes two rear door opening connecting arms disposed on the left and right sides of the top of the rear frame of the push-pull dump truck body, and two rear door cylinders disposed on the left and right sides of the rear frame of the push-pull dump truck body.

[0006] One end of each of the rear door opening connecting arms is hinged to the top of the flat-push dump truck body, and the other end is hinged to the rear door;

[0007] Each of the rear door cylinders is hinged at one end to a rear door opening connecting arm and at the other end to a rear column of the rear frame of the flat-push dump truck body.

[0008] There are two rear pillars, symmetrically located on the outer sides of the left and right sides of the flat-push dump truck body; each rear pillar is also equipped with a body lock hook, and a rear door lock hook is provided on the left and right sides of the rear door, and each rear door lock hook is used to engage and lock with a body lock hook.

[0009] In the above technical solution, the rear frame of the flatbed dump truck body is inclined at an angle α toward the cab of the flatbed dump truck, wherein the angle α is 5°.

[0010] The above technical solution describes a rear frame for a flatbed dump truck body that includes two rear columns inclined at an angle α toward the cab of the flatbed dump truck and located at the rear of the left and right side panels of the flatbed dump truck body; a through beam horizontally located at the lower part of the bottom plate of the flatbed dump truck body; and a connecting beam horizontally located at the rear lower part of the top plate of the flatbed dump truck body. Each rear column is welded and fixed to the side plate of the flatbed dump truck body located on the same side. The through beam is welded and fixed to the bottom plate of the flatbed dump truck body, and the two ends of the connecting beam are welded and fixed to the two rear columns respectively.

[0011] The above technical solution includes a cylinder lower support on the side of each rear column near the cab of the flat-push dump truck, and a box lock hook on the side of each rear column away from the cab of the flat-push dump truck.

[0012] Each of the lower supports of the hydraulic cylinders is hinged to the cylinder barrel of a rear door hydraulic cylinder located on the same side via a pin.

[0013] Each of the aforementioned cabinet locking hooks engages with a corresponding rear door locking hook located on the same side of the rear door when the rear door is closed.

[0014] In the above technical solution, each of the rear door opening connecting arms is provided with a hydraulic cylinder upper support, and each hydraulic cylinder upper support is hinged to the cylinder rod of a rear door hydraulic cylinder provided on the same side via a pin.

[0015] In the above technical solution, one end of each of the rear door opening connecting arms is respectively hinged to a box fixing seat set on the top of the flat-push dump truck box on the same side by a pin shaft, and the other end is respectively hinged to a rear door fixing seat set on the top of the rear door on the same side by a pin shaft.

[0016] In the above technical solution, each of the rear door opening connecting arms is a "7" shaped structure.

[0017] In the above technical solution, when the rear door is opened, the end of each rear door opening connecting arm closest to the rear door is in close contact with the rear door.

[0018] When the rear door is closed, each of the rear door opening connecting arms has a certain angle gap β between its end near the rear door and the rear door.

[0019] In the above technical solution, the included angle gap β is 5°.

[0020] The above technical solution also includes two limit switches installed on the left and right sides of the rear frame of the flatbed dump truck body. Each limit switch is fixed on the side plate of the flatbed dump truck body on the same side. The normally closed circuit of each limit switch is connected in series with the cylinder rod lifting solenoid valve of the corresponding rear door cylinder, and the normally open circuit is connected in series with the unloading solenoid valve of the flatbed dump truck. The contacts are correspondingly matched with the rear door cylinder limit seat provided on the corresponding rear door cylinder. This is used to control the unloading system of the flatbed dump truck to not start when the cylinder rod of the corresponding rear door cylinder is not fully extended, and to stop the hydraulic system of the flatbed dump truck from supplying oil to the rear door cylinder after the cylinder rod is fully extended.

[0021] Compared with the prior art, the advantages of the present invention are: (1) the opening and closing operation of the back door is completed by only one set of actuators, there is no misoperation, and the damage to the back door mechanism caused by misoperation can be avoided; (2) the structure is simple, the operation is convenient, and the work is safe. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the rear door mechanism of the present invention in a locked state with the body of the flat-push dump truck;

[0023] Figure 2 This is a schematic diagram of the rear door mechanism of the present invention in the unlocked state with the flat-push dump truck body;

[0024] Figure 3 This is a schematic diagram of the rear door mechanism and the flat-push dump truck body of the present invention in a fully open state.

[0025] Figure 4 for Figure 1 A schematic diagram of the middle and rear door mechanism in the locked state;

[0026] Figure 5 for Figure 2 A schematic diagram of the middle and rear door mechanism in the unlocked state;

[0027] Figure 6 for Figure 1 Enlarged view of node A in the middle;

[0028] Figure 7 for Figure 2 Enlarged view of node B in the middle;

[0029] Explanation of reference numerals in the attached diagram: 1. Rear door; 2. Rear door opening connecting arm; 3. Rear door cylinder; 4. Flat-push dump truck body; 5. Rear upright; 6. Through beam; 7. Connecting beam; 8. Body lock hook; 9. Rear door lock hook; 10. Lower cylinder support; 11. Upper cylinder support; 12. Body fixing seat; 13. Rear door fixing seat; 14. Limit switch; 15. Rear door cylinder limit seat. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the following description, in conjunction with the accompanying drawings and specific embodiments, further explains how this invention is implemented.

[0031] See Figures 1 to 3 As shown, the present invention provides a rear door mechanism for a push-pull dump truck, comprising a rear door 1 that is inclinedly fitted to the rear frame of the push-pull dump truck body 4, two rear door opening connecting arms 2 disposed on the left and right sides of the top of the rear frame of the push-pull dump truck body 4, and two rear door cylinders 3 disposed on the left and right sides of the rear frame of the push-pull dump truck body 4.

[0032] Among them, one end of each rear door opening connecting arm 2 is hinged to the top of the flat-push dump truck body 4, and the other end is hinged to the rear door 1; one end of each rear door cylinder 3 is hinged to a rear door opening connecting arm 2, and the other end is hinged to a rear column 5 of the rear frame of the flat-push dump truck body 4.

[0033] There are two rear pillars 5, which are symmetrically located on the outer side of the left and right sides of the rear of the flatbed dump truck body 4. Each rear pillar 5 is also equipped with a body lock hook 8, and a rear door lock hook 9 is provided on the left and right sides of the rear door 1. Each rear door lock hook 9 is used to lock and engage with a body lock hook 8.

[0034] Specifically, in this invention, the rear frame of the flatbed dump truck body 4 is inclined at an angle α toward the cab of the flatbed dump truck, wherein the angle α is preferably 5°.

[0035] More specifically, in this invention, as shown in reference 3, the rear frame of the flatbed dump truck body 4 includes two rear columns 5 inclined at an angle α towards the driver's cab and respectively located at the rear of the left and right side panels of the flatbed dump truck body 4, a through beam 6 horizontally located under the bottom plate of the flatbed dump truck body 4, and a connecting beam 7 horizontally located below the rear of the top plate of the flatbed dump truck body 4; wherein, each rear column 5 is welded and fixed to the side plate of the flatbed dump truck body 4 located on the same side, the through beam 6 is welded and fixed to the bottom plate of the flatbed dump truck body 4, and the two ends of the connecting beam 7 are respectively welded and fixed to the two rear columns 5; the function of this rear frame of the flatbed dump truck body 4 is to effectively prevent the problem of the body expanding.

[0036] Specifically, in this invention, see [reference] Figures 1 to 3 , Figure 6 and Figure 7As shown, a cylinder lower support 10 is provided on the side of each rear pillar 5 near the cab of the flat-push dump truck, and a box lock hook 8 is provided on the side of each rear pillar 5 away from the cab of the flat-push dump truck; wherein, each cylinder lower support 10 is hinged to the cylinder of a rear door cylinder 3 provided on the same side by a pin; each box lock hook 8 is engaged and locked with a rear door lock hook 9 provided on the same side of the rear door 1 when the rear door 1 is in the closed state.

[0037] Specifically, in this invention, see [reference] Figures 1 to 5 As shown, each rear door opening connecting arm 2 is provided with a hydraulic cylinder upper support 11, and each hydraulic cylinder upper support 11 is hinged to the cylinder rod of a rear door hydraulic cylinder 3 provided on the same side by a pin.

[0038] Specifically, in this invention, see [reference] Figures 1 to 5 As shown, one end of each rear door opening connecting arm 2 is hinged to a box fixing seat 12 on the top of the flatbed dump truck box 4 on the same side via a pin, and the other end is hinged to a rear door fixing seat 13 on the top of the rear door 1 on the same side via a pin; wherein, each rear door opening connecting arm 2 is preferably a “7” shaped structure.

[0039] Specifically, in this invention, see [reference] Figure 4 and Figure 5 As shown, when the rear door 1 is open, the end of each rear door opening connecting arm 2 near the rear door 1 is in close contact with the rear door 1; when the rear door 1 is closed, a certain angle gap β is left between the end of each rear door opening connecting arm 2 near the rear door 1 and the rear door 1; wherein, the angle gap β is preferably 5°.

[0040] Specifically, in this invention, referring to Figure 8, a limit switch 14 is respectively provided on both the left and right sides of the rear frame of the flatbed dump truck body 4, and a rear door cylinder limit seat 15 corresponding to and linked with the limit switch 14 is provided on each rear door cylinder 3; wherein, each limit switch 14 is fixedly welded to the side plate of the flatbed dump truck body 4 provided on the same side, and each rear door cylinder limit seat 15 is fixedly welded to the cylinder barrel of the corresponding rear door cylinder 3; and the normally closed circuit of each limit switch 14 is connected in series with the cylinder rod lifting solenoid valve (not shown in the figure) of the corresponding rear door cylinder 3, and the normally open circuit is connected in series with the unloading solenoid valve (not shown in the figure) of the flatbed dump truck. Each limit switch 14 has a contact that corresponds to and cooperates with the rear door cylinder limit seat 15 on the corresponding rear door cylinder 3. It is used to control the cylinder rod of the corresponding rear door cylinder 3 so that the unloading system of the flatbed dump truck cannot be started when it is not fully extended, and to stop the hydraulic system of the flatbed dump truck from supplying oil to the rear door cylinder after the cylinder rod is fully extended. That is, each limit switch 14 can, on the one hand, stop the hydraulic system from supplying oil to the corresponding rear door cylinder 3 after the cylinder rod of the corresponding rear door cylinder 3 is fully extended (after the rear door is opened to the position), to prevent the hydraulic system from being overloaded for a long time. On the other hand, it can prevent the unloading system from starting the unloading action when the cylinder rod of the corresponding rear door cylinder 3 is not fully extended, to prevent the unloading system from starting when the rear door is not opened, which would cause squeezing damage to the box and the rear door.

[0041] Specifically, in this invention, the function of the limit switch 14 is to detect whether the cylinder rod of the rear door cylinder 3 has been raised to the correct position. If the contact of the limit switch 14 is not pressed down, it indicates that the rear door has not been raised to the correct position. Since the normally open circuit of the limit switch 14 is connected in series with the unloading solenoid valve, if the unloading button is pressed at this time, the system will not supply power to the unloading solenoid valve, and the unloading action cannot be performed.

[0042] The present invention provides a rear door mechanism for a push-pull dump truck, the specific working process of which is as follows:

[0043] When opening the door, first press the rear door opening button to activate the lifting oil circuit of the rear door cylinder rod in the hydraulic system of the flat-push dump truck. Oil is supplied to the rear door cylinder 3, causing the cylinder rod of the rear door cylinder 3 to push the rear door opening connecting arm 2 to rotate upwards around the body fixing seat 12 under the pressure of the oil. Then, the rear door opening connecting arm 2 drives the rear door 1 to slide along the inclined surface of the rear frame of the flat-push dump truck body 4, gradually reducing the angle gap β between the rear door opening connecting arm 2 and the rear door 1 until the angle gap β between the rear door opening connecting arm 2 and the rear door 1 is 0° (i.e., the rear door opening connecting arm 2 and the rear door 1 are completely in contact). At this time, the rear door locking hooks 9 located on the left and right sides of the rear door 1... The body lock hooks 8 on the two rear pillars 5 on the left and right sides of the flatbed dump truck body 4 are completely separated, that is, the rear door lock hooks are fully opened. Then, the cylinder rod of the rear door cylinder 3 pushes the rear door opening connecting arm 2 to drive the rear door 1 to rotate upward until the rear door opening connecting arm 2 drives the rear door 1 to fully open. At this time, the rear door cylinder limit seat 15 on the cylinder barrel of the rear door cylinder 3 just presses down the limit switch 14 on the side plate of the flatbed dump truck body 4, so that the normally closed circuit of the limit switch 14 is opened and the normally open circuit is closed. The cylinder rod lifting solenoid valve of the rear door cylinder 3 is de-energized, and the hydraulic system no longer supplies oil to the cylinder rod of the rear door cylinder 3. At this time, the opening operation of the rear door 1 is completed.

[0044] When closing the door, first press the rear door closing button to start the hydraulic circuit of the rear door cylinder rod retraction in the hydraulic system of the flatbed dump truck, supply oil to the rear door cylinder 3, so that the cylinder rod of the rear door cylinder 3 pulls the rear door opening connecting arm 2 to rotate downward around the box body fixed seat 12 under the action of the pressure oil. Then, the rear door opening connecting arm 2 drives the rear door 1 to slide along the inclined surface of the rear frame of the flatbed dump truck box 4, so that the angle gap β between the rear door opening connecting arm 2 and the rear door 1 gradually increases until the rear door locking hooks 9 located on the left and right sides of the rear door 1 are fully inserted into the box body locking hooks 8 located on the two rear pillars 5 on the left and right sides of the flatbed dump truck box 4. At this time, the rear door locking hooks are fully locked, and the closing operation of the rear door 1 is completed.

[0045] Finally, it should be noted that the above description is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A rear door mechanism for a push-pull dump truck, characterized in that: The system includes a rear door (1) that is angled and fitted to the rear frame of the flatbed dump truck body (4), two rear door opening connecting arms (2) located on the left and right sides of the top of the rear frame of the flatbed dump truck body (4), and two rear door cylinders (3) located on the left and right sides of the rear frame of the flatbed dump truck body (4); one end of each rear door opening connecting arm (2) is hinged to the top of the flatbed dump truck body (4), and the other end is hinged to the rear door (1); one end of each rear door cylinder (3) is connected to a rear door opening arm. The connecting arm (2) is hinged, and the other end is hinged to a rear column (5) of the rear frame of the flat-push dump truck body (4); there are two rear columns (5) and they are symmetrically arranged on the outer side of the rear of the left and right sides of the flat-push dump truck body (4); each of the rear columns (5) is also provided with a box lock hook (8), and a rear door lock hook (9) is provided on the left and right sides of the rear door (1), and each rear door lock hook (9) is used to lock and engage with a box lock hook (8); It also includes two limit switches (14) set on the left and right sides of the rear frame of the flatbed dump truck body (4). Each limit switch (14) is fixed on the side plate of the flatbed dump truck body (4) set on the same side. The normally closed circuit of each limit switch (14) is connected in series with the cylinder rod lifting solenoid valve of the corresponding rear door cylinder (3), and the normally open circuit is connected in series with the unloading solenoid valve of the flatbed dump truck. The contacts are correspondingly matched with the rear door cylinder limit seat (15) provided on the corresponding rear door cylinder (3). It is used to control the unloading system of the flatbed dump truck to not start when the cylinder rod of the corresponding rear door cylinder (3) is not fully extended, and to stop the hydraulic system of the flatbed dump truck from supplying oil to the rear door cylinder after the cylinder rod is fully extended. When the rear door (1) is opened, the end of each rear door opening connecting arm (2) near the rear door (1) is in close contact with the rear door (1); When the rear door (1) is closed, a certain angle gap β is left between the end of each rear door opening connecting arm (2) near the rear door (1) and the rear door (1); The rear frame of the flatbed dump truck body (4) is inclined at an angle α toward the cab of the flatbed dump truck. The rear frame of the flatbed dump truck body (4) includes two rear columns (5) inclined at an angle α towards the driver's cab of the flatbed dump truck and respectively located at the rear of the left and right side plates of the flatbed dump truck body (4), a through beam (6) horizontally located at the lower part of the bottom plate of the flatbed dump truck body (4), and a connecting beam (7) horizontally located at the rear lower part of the top plate of the flatbed dump truck body (4); each rear column (5) is welded and fixed to the side plate of the flatbed dump truck body (4) located on the same side, the through beam (6) is welded and fixed to the bottom plate of the flatbed dump truck body (4), and the two ends of the connecting beam (7) are respectively welded and fixed to the two rear columns (5); When opening the door, first press the rear door opening button to start the lifting oil circuit of the rear door cylinder rod in the hydraulic system of the flatbed dump truck, supply oil to the rear door cylinder (3), so that the cylinder rod of the rear door cylinder (3) pushes the rear door opening connecting arm (2) to rotate upward around the box body fixing seat (12) under the action of the pressure oil. Then, the rear door opening connecting arm (2) drives the rear door (1) to slide along the inclined surface of the rear frame of the flatbed dump truck box (4), so that the angle gap β between the rear door opening connecting arm (2) and the rear door (1) gradually decreases until the angle gap β between the rear door opening connecting arm (2) and the rear door (1) is 0°. At this time, the rear door lock hooks (9) located on the left and right sides of the rear door 1 and the rear door lock hooks (9) located on the left and right sides of the flatbed dump truck box (4) are locked. The box lock hooks (8) on the two rear pillars (5) on the side are completely separated, that is, the rear door lock hooks (9) are fully opened. Then, the rear door (1) is rotated upward by pushing the rear door opening connecting arm (2) through the cylinder rod of the rear door cylinder (3) until the rear door opening connecting arm (2) drives the rear door (1) to be fully opened. At this time, the rear door cylinder limit seat (15) on the cylinder barrel of the rear door cylinder (3) just presses down the limit switch (14) on the side plate of the flatbed dump truck box (4), so that the normally closed circuit of the limit switch (14) is disconnected and the normally open circuit is closed. The cylinder rod lifting solenoid valve of the rear door cylinder (3) is de-energized, and the hydraulic system no longer supplies oil to the cylinder rod of the rear door cylinder (3). At this time, the opening operation of the rear door (1) is completed. When closing the door, first press the rear door closing button to start the rear door cylinder rod retraction oil circuit in the hydraulic system of the flatbed dump truck, supply oil to the rear door cylinder (3), and let the cylinder rod of the rear door cylinder (3) pull the rear door opening connecting arm (2) to rotate downward around the box body fixing seat (12) under the action of the pressure oil. Then, the rear door opening connecting arm (2) drives the rear door (1) to slide along the inclined surface of the rear frame of the flatbed dump truck box (4), so that the angle gap β between the rear door opening connecting arm (2) and the rear door (1) gradually increases until the rear door lock hooks (9) located on the left and right sides of the rear door (1) are fully inserted into the box body lock hooks (8) located on the two rear pillars (5) on the left and right sides of the flatbed dump truck box (4). At this time, the rear door lock hooks are fully locked, and the closing operation of the rear door (1) is completed.

2. The rear door mechanism of the flat-push dump truck according to claim 1, characterized in that: The values ​​of the tilt angle α and the included angle gap β are both 5°.

3. The rear door mechanism of the flat-push dump truck according to claim 1, characterized in that: A cylinder lower support (10) is provided on the side of each of the rear pillars (5) near the cab of the flat-push dump truck, and a box lock hook (8) is provided on the side of each of the rear pillars (5) away from the cab of the flat-push dump truck. Each of the lower supports (10) of the hydraulic cylinder is hinged to the cylinder barrel of a rear door hydraulic cylinder (3) located on the same side by means of a pin. Each of the aforementioned box lock hooks (8) is engaged and locked with a corresponding rear door lock hook (9) located on the same side of the rear door (1) when the rear door (1) is closed.

4. The rear door mechanism of the flat-push dump truck according to claim 3, characterized in that: Each of the rear door opening connecting arms (2) is provided with a cylinder upper support (11), and each cylinder upper support (9) is hinged to the cylinder rod of a rear door cylinder (3) provided on the same side by a pin.

5. The rear door mechanism of the flat-push dump truck according to claim 4, characterized in that: Each of the rear door opening connecting arms (2) is hinged at one end to a box fixing seat (12) on the top of the flat-push dump truck box (4) on the same side via a pin, and at the other end to a rear door fixing seat (13) on the top of the rear door (1) on the same side via a pin.

6. The rear door mechanism of the flat-push dump truck according to claim 5, characterized in that: Each of the rear door opening connecting arms (2) is a "7" shaped structure.

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