Rear door fault detection device of dump truck and dump truck

Abstract

A first switch is connected with an alarm circuit and is arranged on a first edge of a first side door of the dump truck, a switch control module is arranged on a second edge of a rear door of the dump truck, the first edge is the edge closest to the rear door of the dump truck, and the second edge is the edge closest to the first side door of the dump truck. The second edge and the first edge are located on the same side of the dump truck body, and the second edge is the edge closest to the first edge, so that the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door is not larger than the preset distance, namely, when the rear door is closed, the first switch is turned off under the action of the switch control module; the alarm circuit does not give an alarm because the power supply is not connected; when the distance between the bottom end of the rear door and the bottom end of the first side door is larger than the preset distance, namely, the rear door of the dump truck is opened, the first switch is closed, the alarm circuit is connected to a power source and gives an alarm, and a driver is prompted to open the rear door in time.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle safety control field, especially a dump truck's rear door fault detection device and dump truck. BACKGROUND

[0002] The dump truck is a kind of special dump truck that utilizes the engine power of the vehicle to drive hydraulic lifting mechanism, tilts its carriage to a certain angle to unload, and relies on the self-weight of the carriage to reset it.The rear door of the carriage of the existing dump truck is locked by mechanical chain to drive mechanical lock hook, and further locked together with the side lock hook on the two side doors of the carriage to realize the locking of the rear door of the carriage.However, due to the harsh working conditions of the dump truck, the mechanical chain at the mechanical lock hook of the rear door is prone to breakage or bolt loosening, which causes the mechanical locking of the rear door by the side lock hook on the two side doors of the carriage, and although the existing side lock hook has a blocking pin and a jump stop, the jump stop is prone to deformation or breakage during actual use of the dump truck, therefore, the rear door locking mechanism has the problem of insufficient automatic locking capability, and the driver cannot timely detect whether the rear door is in the locked state during driving of the dump truck, which leads to the problem of material dripping or rear door falling off when the rear door of the dump truck is not tightly sealed, and seriously causes danger to the rear vehicle. SUMMARY

[0003] The utility model aims at providing a dump truck's rear door fault detection device and dump truck, the first switch is connected with alarm circuit, and is arranged at the first edge of the first side door of dump truck, and the switch control module is arranged at the second edge of the rear door of dump truck, the first edge is the nearest side to the rear door of dump truck, and the second edge is located at the same side of the vehicle body of dump truck with the first edge, and the second edge is the nearest side to the first edge, therefore, the distance between the bottom end of the rear door of dump truck and the bottom end of the first side door is not greater than preset distance, that is, when the rear door is closed, the first switch is turned off under the action of switch control module, and the alarm circuit does not alarm because no power is connected;When the distance between the bottom end of the rear door and the bottom end of the first side door is greater than preset distance, that is, when the rear door of dump truck is opened, the first switch is closed, so that the alarm circuit is connected with power and alarms to timely prompt the driver that the rear door is opened.

[0004] To solve the above technical problems, the utility model provides a dump truck's rear door fault detection device, which comprises a first switch, a switch control module and an alarm circuit.

[0005] The first switch is connected with the alarm circuit, and is arranged at the first edge of the first side door of the dump truck, and the first edge is the nearest side to the rear door of the dump truck;

[0006] The switch control module is arranged at a second edge of the rear door of the dump truck, the second edge is located at the same side of the vehicle body of the dump truck as the first edge, and the second edge is the edge closest to the first edge;

[0007] When the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door is not greater than the preset distance, the first switch is turned off under the action of the switch control module; when the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door is greater than the preset distance, the first switch is closed, so that the alarm circuit is connected to the power supply and alarm is performed.

[0008] Preferably, a second switch connected between the first switch and the alarm circuit is further included, for being closed when receiving a closing instruction.

[0009] Preferably, the switch control module includes a control coil, the control coil is connected to the power supply and generates current when the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door is not greater than the preset distance, so as to attract the contact of the first switch and turn off the first switch.

[0010] Preferably, the power supply is a battery module.

[0011] Preferably, the alarm circuit is arranged in the cab of the dump truck.

[0012] Preferably, the alarm circuit includes a sound alarm circuit and / or a light alarm circuit.

[0013] Preferably, the sound alarm circuit includes a buzzer and / or a horn.

[0014] Preferably, the light alarm circuit includes an LED lamp and / or a display screen.

[0015] Preferably, the first switch is arranged at the bottom end of the first edge, and the switch control module is arranged at the bottom end of the second edge.

[0016] To solve the above technical problems, the utility model provides a dump truck, including the rear door fault detection device of dump truck as described above.

[0017] The utility model provides a kind of rear door fault detection device of dump truck and dump truck, first switch is connected with alarm circuit, and it is set to the first edge of the first side door of dump truck, switch control module is set to the second edge of the rear door of dump truck, first edge is the edge closest to the rear door of dump truck, and second edge and first edge are located at the same side of the vehicle body of dump truck, and second edge is the edge closest to first edge, therefore, the distance between the bottom end of the rear door of dump truck and the bottom end of first side door is not greater than preset distance, that is, when rear door is closed, first switch is turned off under the action of switch control module, alarm circuit does not alarm because it is not connected to power supply;And the distance between the bottom end of rear door and the bottom end of first side door is greater than preset distance, that is, when the rear door of dump truck is opened, first switch is closed, so that alarm circuit is connected to power supply and alarms, to prompt driver rear door opening in time. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the utility model embodiments, the following will be needed to use the drawings in the embodiment is briefly introduced, obviously, the following description in the drawings is only some embodiments of the utility model, for those skilled in the art, without creating labor, according to these drawings, other drawings can also be obtained.

[0019] Figure 1 The structure diagram of the rear door fault detection device of the dump truck provided by the utility model is shown in the figure.

[0020] Figure 2 The rear door locking structure in the prior art is shown in the figure.

[0021] Figure 3 The schematic diagram of the first switch and switch control module provided by the utility model is set on the dump truck. DETAILED DESCRIPTION

[0022] The core of the utility model is to provide a kind of rear door fault detection device of dump truck and dump truck, first switch is connected with alarm circuit, and it is set to the first edge of the first side door of dump truck, switch control module is set to the second edge of the rear door of dump truck, first edge is the edge closest to the rear door of dump truck, and second edge and first edge are located at the same side of the vehicle body of dump truck, and second edge is the edge closest to first edge, therefore, the distance between the bottom end of the rear door of dump truck and the bottom end of first side door is not greater than preset distance, that is, when rear door is closed, first switch is turned off under the action of switch control module, alarm circuit does not alarm because it is not connected to power supply;And the distance between the bottom end of rear door and the bottom end of first side door is greater than preset distance, that is, when the rear door of dump truck is opened, first switch is closed, so that alarm circuit is connected to power supply and alarms, to prompt driver rear door opening in time.

[0023] In order to make the purpose, technical scheme and advantages of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be described clearly and completely below in combination with the drawings in the utility model embodiment. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0024] Please refer to Figure 1 , Figure 1 The structure diagram of a rear door fault detection device of a self-unloading truck provided by the utility model, comprising a first switch 2, a switch control module 1 and an alarm circuit 3;

[0025] The first switch 2 is connected with the alarm circuit 3 and is arranged on the first edge of the first side door of the self-unloading truck, and the first edge is the edge closest to the rear door of the self-unloading truck;

[0026] The switch control module 1 is arranged on the second edge of the rear door of the self-unloading truck, the second edge and the first edge are located on the same side of the vehicle body of the self-unloading truck, and the second edge is the edge closest to the first edge;

[0027] When the distance between the bottom end of the rear door of the self-unloading truck and the bottom end of the first side door is not greater than the preset distance, the first switch 2 is turned off under the action of the switch control module 1; when the distance between the bottom end of the rear door of the self-unloading truck and the bottom end of the first side door is greater than the preset distance, the first switch 2 is closed, so that the alarm circuit 3 is connected to the power supply 4 and alarm is performed.

[0028] A dump truck is a vehicle that can unload cargo by itself through a hydraulic or mechanical lifting mechanism, and is usually composed of a chassis, a hydraulic lifting mechanism, a cargo compartment, a power take-off device and other components. The cargo compartment of a dump truck can be divided into two types: rearward tilting and lateral tilting. The tilting of the cargo compartment is controlled by a control system to move the piston rod and push the cargo compartment to unload the cargo. There are various designs for the rear door locking mechanism of a dump truck, and common designs include a chain plate type locking mechanism and an automatic opening and locking device for the rear door of a dump truck. The chain plate type locking mechanism is composed of a base, a threaded rod, a chain, a pin shaft seat and a locking plate. When the cargo compartment is lifted, the chain is loosened, the rear plate is impacted to open the locking plate, the locking plate is lowered by gravity, and as the cargo compartment falls back, the locking plate is locked with the rear plate under the pulling of the chain. The automatic opening and locking device for the rear door of a dump truck is designed by a limiting column and a limiting plate to achieve automatic opening and locking of the rear door. When unloading, the front end of the cargo compartment is lifted, the position of the limiting column is changed, the limiting plate is separated from the hook, and the rear door is automatically opened. When unloading is completed, the front end of the cargo compartment is lowered, the limiting plate is pushed by the limiting column, and the rear door is automatically locked. However, if the lock hook or lock pin is worn or deformed, the locking force is insufficient, and the rear door may be automatically opened due to bumps or vibrations during driving. In addition, the mechanical structure of the rear door (such as the chain, threaded rod, locking plate, etc.) may be loose or deformed after long-term use, affecting the locking effect. Furthermore, the cargo in the cargo compartment may move or impact the rear door during driving, causing the rear door locking mechanism to loosen or be damaged. If the rear door is automatically opened, the cargo may be thrown during driving, causing environmental pollution and economic losses, and increasing the risk of traffic accidents. Figure 2 As shown in FIG. 1, Figure 2 FIG. 1 is a schematic diagram of a rear door locking structure in the prior art. When the rear door is closed, the side lock hook on the side door can be lowered to be buckled on the iron column of the rear door to lock the rear door. In addition, a rear door lock hook is arranged at the rear door. When the rear door is closed, the rear door lock hook is buckled on the rear door, and the rear door lock hook is pulled tight by an iron chain to further lock the rear door. However, when the side lock hook is detached or the iron column on the rear door is detached, the rear door cannot be locked by the side lock hook. If the rear door lock hook is detached or the iron chain is broken, the rear door cannot be locked either. At this time, the rear door will also be abnormally opened.

[0029] In this embodiment, a first switch 2 and a switch control module 1 are arranged at the rear door and the first side door of the cargo compartment. The first switch 2 is arranged at a first edge on the first side door, and the first edge is the edge on the first side door closest to the rear door. The switch control module 1 is arranged at a second edge on the rear door. Since the rear door of the cargo compartment is actually a cuboid structure, in order to facilitate the determination of whether the rear door is opened, the second edge and the first edge are located on the same side of the cargo compartment. That is, when the cargo compartment is compared to a cuboid with the rear door and the side doors closed, the first edge and the second edge are located on the same face of the cuboid. Please refer toFigure 3 , Figure 3 The utility model provides a kind of first switch and the schematic view of the setting of switch control module on dump truck.

[0030] When the rear door is closed, the first edge of the first side door and the second edge of the rear door are parallel to each other and meet, that is, the distance between each point on the first edge and the corresponding parallel point on the second edge is equal and minimum, at this time, the distance between the switch control module 1 and the first switch 2 is less than the preset distance, so as to control the first switch 2 to turn off, the circuit between the alarm circuit 3 and the power supply 4 is disconnected by the first switch 2, and the alarm circuit 3 cannot alarm, so the driver can determine that the rear door is in the closed state. However, if the rear door is opened, whether the top end of the rear door is stationary but the bottom end is inclined or the bottom end of the rear door is stationary but the top end is inclined when the rear door is opened, there will be an included angle between the first edge and the second edge, that is, the first edge and the second edge are no longer parallel. Taking the case where the top end of the rear door is stationary but the bottom end is inclined when the rear door is opened as an example, when the rear door is closed, the bottom end at the first edge of the rear door meets the bottom end at the second edge of the first side door, and the distance between the bottom end of the rear door and the bottom end of the first side door is less than the preset distance. When the rear door is opened, the distance between the bottom end of the rear door and the bottom end of the first side door becomes larger than the preset distance. Under the action of the switch control module 1, the first switch 2 is closed, the alarm circuit 3 is connected to the power supply 4 through the first switch 2, and thus alarms. The driver can determine that the rear door is in the open state according to the alarm of the alarm circuit 3.

[0031] The first switch 2 can be a normally closed switch, that is, when the rear door is opened and the distance between the bottom end of the rear door and the bottom end of the first side door is greater than the preset distance, the distance between the first switch 2 and the switch control module 1 is also larger, at this time, the first switch 2 can remain in the closed state to enable the alarm circuit 3 to be connected to the power supply 4 for alarm. When the rear door is closed and the distance between the bottom end of the rear door and the bottom end of the first side door is not greater than the preset distance, the distance between the switch control module 1 and the first switch 2 is smaller, and the first switch 2 can be turned off under the action of the switch control module 1 to disconnect the circuit between the alarm circuit 3 and the power supply 4, so that the alarm circuit 3 cannot be connected to the power supply 4 and does not alarm. The normally closed switch reduces the possibility of switch malfunction caused by external factors, is suitable for applications that require the circuit to be always connected or have high safety, that is, can remain in the closed state when the rear door is opened to ensure that the alarm circuit 3 can be connected to the power supply 4 in time for alarm.

[0032] It should be noted that when the dump truck is opened, the top end of the rear door is stationary but the bottom end is inclined, then the first switch 2 can be arranged at a position other than the top end on the first edge, the switch control module 1 is arranged at a position other than the top end on the second edge, and the preset distance can be set according to the distance between the first switch 2 and the switch control module 1 when the rear door is closed.

[0033] It should be further noted that the first mounting plate can be arranged at the first edge of the first side door, and the first switch 2 and the power supply 4 are mounted on the first mounting plate, and the second mounting plate is arranged at the second edge of the rear door, and the switch control module 1 is arranged on the second mounting plate.

[0034] As a preferred embodiment, the first switch 2 is arranged at the bottom end of the first edge, and the switch control module 1 is arranged at the bottom end of the second edge, and the first switch 2 and the switch control module 1 can be arranged on the same horizontal line, so that when the rear door is only slightly opened, the first switch 2 can also be turned on under the action of the switch control module 1, that is, the preset distance is set to a small value, such as 0, so that the alarm circuit 3 can timely alarm, of course, the present application is not limited to this.

[0035] As described above, the locking mechanisms of the rear doors of the dump trucks are various, and the automatic opening of the rear door can be caused by the failure of the locking mechanism, the failure of the hydraulic system, the loosening of the mechanical structure or the impact of the goods, which not only causes the goods to be scattered and safety hazards, but also can damage the vehicle and reduce the transportation efficiency

[0036] On the basis of the above embodiment:

[0037] As a preferred embodiment, a second switch connected between the first switch 2 and the alarm circuit 3 is further included for closing when receiving a closing instruction.

[0038] In the embodiment, a second switch is further arranged between the first switch 2 and the alarm circuit 3, and when receiving a closing instruction, the second switch is closed, and at this time, if the rear door of the dump truck is opened, that is, the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door is greater than the preset distance, the first switch 2 is closed, so that the alarm circuit 3 is connected to the power supply 4 and alarms.

[0039] By arranging the second switch, after the worker loads the goods into the carriage of the dump truck and closes the rear door, a closing instruction can be sent to close the second switch, and at this time, the expected state is that the rear door is continuously kept closed, and if the first switch 2 is closed due to the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door being greater than the preset distance, the alarm circuit 3 is connected to the power supply 4 through the first switch 2 and the second switch and alarms. Correspondingly, when the worker actively opens the rear door for unloading or loading, no closing instruction is sent, or a closing-off instruction is sent to turn off the second switch, and at this time, even if the first switch 2 is closed due to the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door being greater than the preset distance, the alarm circuit 3 will not be connected to the power supply 4 to alarm, thereby avoiding false alarms when the rear door is normally opened.

[0040] The second switch can be a normally open switch. When no closing instruction is received, the second switch remains in an off state to avoid false alarms of the alarm circuit 3 connected to the power supply 4. It should be noted that the closing instruction is a closing instruction sent by the staff.

[0041] As a preferred embodiment, the switch control module 1 includes a control coil. When the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door is not greater than the preset distance, the control coil is connected to the power supply 4 and generates a current to attract the contact of the first switch 2 to turn off the first switch 2.

[0042] The switch control module 1 in this embodiment includes a control coil. When the rear door of the dump truck is closed, the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door is not greater than the preset distance. Since the switch control module 1 is arranged on the rear door of the dump truck and the first switch 2 is arranged on the first side door of the dump truck, the distance between the switch control module 1 and the first switch 2 is not greater than the preset distance. The control coil in the switch control module 1 is connected to the power supply 4 to attract the contact of the first switch 2 to turn off the first switch 2.

[0043] Further, the power supply 4 can be arranged on the first side door. When the rear door is closed, the first end of the control coil is connected to the output end of the power supply 4, and the second end is grounded. Therefore, the current output by the power supply 4 passes through the control coil, a magnetic field is generated on the control coil, and the contact of the first switch 2 is attracted. Correspondingly, the first end of the first switch 2 is connected to the output end of the power supply 4, the second end is connected to the first end of the alarm circuit 3, and the second end of the alarm circuit 3 is grounded. When the rear door is closed, the control coil attracts the contact of the first switch 2, the circuit between the first end and the second end of the first switch 2 is disconnected, and the circuit between the alarm circuit 3 and the power supply 4 is disconnected. When the rear door is opened, the circuit between the control coil and the power supply 4 is disconnected, and the first switch 2 is closed, so that the alarm circuit 3 is connected to the power supply 4 and alarms.

[0044] As a preferred embodiment, the power supply 4 is a battery module.

[0045] In this embodiment, the power supply 4 for the alarm circuit 3 can be a battery module. The battery module not only has a simple structure, but also has a low cost. The type and voltage of the battery module can be selected according to the voltage demand of the alarm circuit 3 to ensure that the alarm circuit 3 can alarm after being connected to the power supply 4.

[0046] In addition, the power supply 4 can also reuse the power supply 4 of the dump truck to further reduce the required cost and reduce the space occupation of the rear door fault detection device of the dump truck.

[0047] As a preferred embodiment, the alarm circuit 3 is arranged in the cab of the dump truck.

[0048] In order to ensure that the driver can be prompted in time when the back door is abnormally opened, the alarm circuit 3 in the embodiment is arranged in the cab of the dump truck, and can be arranged on the control panel in the cab. When the driver is focused on driving the dump truck and cannot be distracted to check the opening or closing state of the back door, the driver can also be prompted when the back door is abnormally opened, so that the driver can handle the abnormally opened back door in time.

[0049] It should be noted that since the first switch 2 is arranged at the first edge of the first side door, and the first edge is the edge closest to the back door, the first switch 2 is actually located at the last end of the dump truck, the cab is located at the front end of the dump truck, and the connection line between the first switch 2 and the alarm circuit 3 is relatively long. Therefore, a waterproof layer can be wrapped outside the connection line to avoid the circuit between the first switch 2 and the alarm circuit 3 from being burned due to water leakage.

[0050] As a preferred embodiment, the alarm circuit 3 includes a sound alarm circuit 3 and / or a light alarm circuit 3.

[0051] The alarm circuit 3 in the embodiment can include a sound alarm circuit 3 and / or a light alarm circuit 3. The sound alarm circuit 3 can prompt the driver when the driver is focused on driving the truck and cannot frequently move the line of sight. The light alarm circuit 3 can prompt the driver when the driver is in a noisy driving environment and cannot perceive the alarm of the sound alarm circuit 3. By simultaneously arranging the sound alarm circuit 3 and the light alarm circuit 3, the driver can be prompted in all directions, and the driver can be informed of the abnormally opened back door in time and handled, thereby avoiding causing greater adverse effects.

[0052] As a preferred embodiment, the sound alarm circuit 3 includes a buzzer and / or a horn.

[0053] The sound alarm circuit 3 in the embodiment includes a buzzer and / or a horn. The buzzer can be used for sound alarm by setting the buzzer frequency. The buzzer not only has low cost, but also has a simple control mode. Different buzzer frequencies can be set to perform different alarm prompts, such as not only the prompt of the abnormally opened back door, but also the prompt of the abnormal tire pressure. The application is not limited in this regard.

[0054] The horn can play different audio, and therefore, the horn can also perform different alarm prompts.

[0055] By simultaneously arranging the buzzer and the horn, the driver can be further prompted in time about the abnormally opened back door.

[0056] As a preferred embodiment, the light alarm circuit 3 comprises an LED lamp and / or a display screen.

[0057] The light alarm circuit 3 in the embodiment comprises an LED lamp and / or a display screen, the LED lamp is low in cost, small in occupied space, and different alarm prompts can be performed by selecting different colors of the LED lamp.

[0058] The display screen can not only prompt whether the back door is abnormally opened, but also display the working state of the dump truck, which is not limited in the application.

[0059] To solve the above technical problems, the utility model provides a dump truck, including the back door fault detection device of dump truck as described above.

[0060] For the dump truck provided by the utility model, please refer to the above method embodiment, and the utility model will not be repeated here.

[0061] It should be further noted that in the present specification, relational terms such as first and second and the like can only be used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations exist in any such actual relationship or order. Moreover, the terms "comprise", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0062] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rear door fault detection device for dump trucks, characterized in that, The first switch, the switch control module and the alarm circuit are included. The first switch is connected with the alarm circuit and is arranged at a first edge of a first side door of the dump truck, and the first edge is the closest edge to a rear door of the dump truck. The switch control module is arranged at a second edge of the rear door of the dump truck, the second edge is located at the same side of the vehicle body of the dump truck as the first edge, and the second edge is the closest edge to the first edge. When the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door is not greater than a preset distance, the first switch is turned off under the action of the switch control module. When the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door is greater than the preset distance, the first switch is closed to enable the alarm circuit to be connected to the power supply and to alarm.

2. The rear door malfunction detection apparatus of a dump truck according to claim 1, characterized by A second switch is further connected between the first switch and the alarm circuit, and is used to be closed when a closing instruction is received.

3. The rear door malfunction detection apparatus of a dump truck according to claim 1, characterized by The switch control module includes a control coil, and when the distance between the bottom end of the rear door of the dump truck and the bottom end of the first side door is not greater than the preset distance, the control coil is connected to the power supply and generates a current to attract the contact of the first switch to turn off the first switch.

4. The rear door malfunction detection apparatus of a dump truck according to claim 1, characterized by The power supply is a battery module.

5. The apparatus for detecting malfunction of the rear door of a dump truck according to claim 1, wherein The alarm circuit is arranged in the cab of the dump truck.

6. The rear door malfunction detection apparatus of a dump truck according to claim 1, characterized by The alarm circuit includes a sound alarm circuit and / or a light alarm circuit.

7. The rear door malfunction detection apparatus of a dump truck according to claim 6, characterized by The sound alarm circuit includes a buzzer and / or a horn.

8. The rear door malfunction detection apparatus of a dump truck according to claim 6, characterized by The light alarm circuit includes an LED lamp and / or a display screen.

9. The device for detecting malfunction of the rear door of a dump truck according to any one of claims 1 to 8, characterized in that, The first switch is arranged at the bottom end of the first edge, and the switch control module is arranged at the bottom end of the second edge.

10. A self-discharging vehicle, characterized in that The rear door fault detection device of the dump truck includes any one of claims 1-9.

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