Mining dump truck and container locking control system thereof

Abstract

The invention belongs to the technical field of underground coal mine transportation equipment, and provides a mining dump truck and a container locking control system thereof in order to solve the problem that misoperation of a container is easily caused by misoperation or system faults of an existing anti-explosion rubber wheel dump truck. The running state of the vehicle is judged, when the vehicle is in a transportation state, electric locking is achieved by cutting off control signals of the electromagnetic valve, and safety accidents of facility damage and life casualties caused by automatic lifting of a container in the vehicle running process are avoided; when the vehicle is in a static state, the first hand-operated direction valve and the second hand-operated direction valve of the double-control multi-way valve set need to be operated at the same time, lifting control over the container is achieved, the situation that the container acts due to misoperation of a single handle in the material loading and unloading process of the vehicle is prevented, and mechanical locking is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of underground coal mine transportation equipment, and in particular relates to a mining dump truck and a cargo box locking control system thereof. Background Art

[0002] Explosion-proof rubber-tyred trackless vehicles have become the first choice for auxiliary transportation in large coal mines with their advantages of "efficiency, flexibility and convenience". Coal mine auxiliary materials are of many types, with great differences and variable usage. The use of rail-type transportation methods has the disadvantages of low transportation efficiency, high work intensity and poor transportation safety. The advantages of choosing trackless rubber-tyred vehicles for transportation are particularly obvious. At present, the main vehicles for transporting auxiliary materials in coal mines are explosion-proof rubber-tyred self-unloading vehicles. This type of vehicle adopts an articulated two-section frame, with the cab and vehicle power system arranged on the front frame, and the transport cargo box arranged on the rear frame. The cargo box adopts a self-unloading structure, and the hydraulic cylinder controls the lifting of the cargo box to realize self-unloading of materials. The operation is simple and flexible, and the transportation is safe and efficient.

[0003] However, the current explosion-proof rubber-tyred dump truck cargo box dumping system all adopts an open single control system, that is, the lifting of the cargo box is controlled by a control handle. In actual use, accidents caused by malfunction of the cargo box due to operational errors or system failures are prone to occur. Power supply cables, water pipes, air ducts and other facilities are installed on the top of the tunnel. Once the cargo box malfunctions and rises during the driving of the vehicle, the raised cargo box is very likely to collide with the equipment on the top of the tunnel, which is bound to cause serious accidents of damage to the facilities and even safety accidents that endanger people's lives. Summary of the invention

[0004] In order to solve at least one of the above technical problems existing in the prior art, the present invention provides a mining dump truck and a cargo box locking control system thereof.

[0005] According to the first aspect, the present invention is implemented by the following technical solution: a locking control system for a cargo box of a mining dump truck, comprising: an electronic locking subsystem, a mechanical locking subsystem, and a solenoid valve shared by the two systems;

[0006] The electronic locking subsystem is used to monitor the vehicle speed of the mining dump truck, and control the switching of the solenoid valve according to the vehicle speed, and control the on-off of the hydraulic oil circuit of the mechanical locking subsystem according to the valve core position of the solenoid valve;

[0007] The mechanical locking subsystem includes a double-control multi-way valve group, which drives the cargo box lifting cylinder to move through the coordinated switching of two multi-way valves in the double-control multi-way valve group to achieve the lifting or lowering action of the cargo box.

[0008] Preferably, the electronic locking subsystem includes: a data acquisition module, a controller host, a speed sensor and a relay;

[0009] The speed sensor is used to collect the speed data of the vehicle driving wheels of the mining dump truck;

[0010] The data acquisition module is used to collect the speed data collected by the speed sensor and convert the speed data into an electrical signal that can be received by the controller host;

[0011] The controller host is used to analyze the electrical signal, determine the current driving state of the mining dump truck, and control the power on or off of the relay coil based on the driving state of the mining dump truck;

[0012] The solenoid valve changes the valve core position based on the closing or opening of the normally open contact of the relay;

[0013] The on-off of the hydraulic oil circuit of the mechanical locking subsystem is controlled according to the valve core position of the solenoid valve.

[0014] Preferably, it also includes: a display for receiving the data analysis results of the controller host and displaying the status information of the mining dump truck according to the data analysis results.

[0015] Preferably, the mechanical locking subsystem includes: a hydraulic pump, a double-control multi-way valve group, a self-unloading cylinder and an oil tank;

[0016] The oil inlet of the hydraulic pump is connected to the oil tank, the oil outlet of the hydraulic pump is connected to the a3 port of the solenoid valve, the b3 port of the solenoid valve is connected to the P port of the double-control multi-way valve group, the A port of the double-control multi-way valve group is connected to the rodless chamber of the dump cylinder, the B port of the double-control multi-way valve group is connected to the rod chamber of the dump cylinder, and the T port of the double-control multi-way valve group is connected to the oil tank.

[0017] Preferably, the double-control multi-way valve group includes a one-way valve, a first safety valve, a first manual reversing valve and a second manual reversing valve;

[0018] The P port of the double-control multi-way valve group is communicated with the a1 port of the first manual reversing valve, the b1 port of the first manual reversing valve is communicated with the T port of the double-control multi-way valve group, the c1 port of the first manual reversing valve is communicated with the oil inlet of the one-way valve, the oil inlet of the first safety valve and the b2 port of the second manual reversing valve, the oil outlet of the one-way valve is communicated with the a2 port of the second manual reversing valve, the c2 port of the second manual reversing valve is communicated with the oil outlet of the first safety valve, the e2 port of the second manual reversing valve and the T port of the double-control multi-way valve group, the d2 port of the second manual reversing valve is communicated with the A port of the double-control multi-way valve group, the f2 port of the second manual reversing valve is communicated with the B port of the double-control multi-way valve group, and the oil outlet of the first safety valve is communicated with the T port of the double-control multi-way valve group;

[0019] When the hydraulic oil circuit of the mechanical locking subsystem is connected, the first manual reversing valve is operated to reverse upward, and the second manual reversing valve is operated to reverse downward. At this time, the hydraulic oil flows in from the P port, flows through the first manual reversing valve and the one-way valve, flows into the second manual reversing valve from a2, and then flows out from the d2 port, and then flows into the rodless chamber of the self-unloading cylinder through the A port of the double-control multi-way valve group. At this time, the cargo box is lifted and unloaded;

[0020] When the cargo box has completed unloading, operate the second manual reversing valve to reverse upward. At this time, the hydraulic oil flows in from the P port, flows through the first manual reversing valve and the one-way valve, flows into the second manual reversing valve from a2, and then flows out from the f2 port, and then flows into the rod chamber of the self-unloading cylinder through the B port of the double-control multi-way valve group. At this time, the cargo box falls back.

[0021] Preferably, the first manual reversing valve is a two-position three-way reversing valve, and the second manual reversing valve is a three-position six-way reversing valve.

[0022] Preferably, it also includes: a second safety valve installed between the oil outlet of the hydraulic pump and the oil tank, which is used to limit the overload operation of the mechanical locking subsystem.

[0023] According to a second aspect, the present invention further provides a mining dump truck, which is equipped with the mining dump truck cargo box locking control system according to the first aspect and any preferred embodiment, and further includes a front frame, a rear frame and a cargo box;

[0024] The front frame and the rear frame are connected by a central hinge to form a vehicle frame assembly. The cargo box is connected to the rear frame through a slewing support. The hydraulic pump is arranged on the front frame and connected to the engine assembly of the mining dump truck. The double-control multi-way valve group is installed in the cab of the mining dump truck. The speed sensors are arranged above the front and rear frame drive axle mounting seats respectively. The controller host is installed and fixed on the front frame, the solenoid valve is installed on the rear side of the front frame, the relay is connected in series between the controller host and the solenoid valve connection circuit, the safety valve is installed behind the hydraulic pump, the cylinder bottom of the dump cylinder is hinged to the rear frame, the piston rod of the dump cylinder is hinged to the cargo box, the data acquisition module is installed on the front frame, and the display is installed and fixed in the cab of the mining dump truck.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. Mechanical locking function of the operating system: a double-control multi-way valve group is used to control the lifting and lowering of the cargo box. The two manual reversing valves of the double-control multi-way valve group must be operated at the same time to realize the lifting and lowering of the cargo box, so as to prevent the accidental operation of a single handle during the loading and unloading process of the vehicle, causing the cargo box to move. It has mechanical locking.

[0027] 2. Electronic locking function of the control system: The control system controls the closing and disconnecting states of the solenoid valve according to the monitored vehicle speed information, and controls the on-off state of the hydraulic system circuit, so that the hydraulic system is in the disconnected state during vehicle driving, and the cargo box is electronically locked to avoid safety accidents such as damage to facilities and casualties caused by automatic lifting of the cargo box during vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic structural diagram of a cargo box locking device for a mining dump truck provided by an embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of a mining dump truck provided by an embodiment of the present invention.

[0031] In the figure, 1-hydraulic pump, 2-double-control multi-way valve group, 2.1-first manual reversing valve, 2.2 second manual reversing valve, 3.1-first speed sensor, 3.2-second speed sensor, 4-controller host, 5-relay, 6-solenoid valve, 7-dump cylinder, 8-data acquisition module, 9-display, 10-oil tank, 11-second safety valve, 12-front frame, 13-rear frame, 14-cargo box. DETAILED DESCRIPTION

[0032] In conjunction with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0034] The current explosion-proof rubber-wheeled dump trucks are prone to serious accidents due to misoperation of the cargo box, which may cause damage to facilities or even endanger the lives of personnel. The embodiment of the present invention provides a mining dump truck and its cargo box locking control system, which uses a double-control multi-way valve group to control the lifting of the cargo box to prevent the cargo box from moving due to misoperation of a single handle during the loading and unloading of materials by the vehicle, thereby realizing mechanical locking; the electronic control system controls the closing and disconnecting states of the solenoid valve according to the monitored vehicle speed information, thereby realizing the electronic locking of the cargo box lifting function during the vehicle driving process, thereby improving the safety of vehicle use.

[0035] The present invention provides an embodiment:

[0036] like Figure 1 As shown, a locking control system for a cargo box of a mining dump truck comprises: an electronic locking subsystem, a mechanical locking subsystem and a solenoid valve 6 shared by the two systems; the electronic locking subsystem is used to monitor the vehicle speed of the mining dump truck, and control the switching of the solenoid valve 6 according to the vehicle speed, and control the on-off of the hydraulic oil circuit of the mechanical locking subsystem according to the valve core position of the solenoid valve 6; the mechanical locking subsystem comprises a double-control multi-way valve group 2, through which the two multi-way valves in the double-control multi-way valve group 2 cooperate with each other to drive the lifting cylinder of the cargo box 14 to move, so as to realize the lifting or lowering action of the cargo box 14.

[0037] In this embodiment, the electronic locking subsystem includes: a data acquisition module 8, a controller host 4, a speed sensor and a relay 5; the speed sensor is communicatively connected to the data acquisition model, and is used to collect the speed data of the vehicle driving wheel of the mining dump truck; the data acquisition module 8 is communicatively connected to the controller host 4, and is used to collect the speed data collected by the speed sensor, and convert the speed data into an electrical signal that can be received by the controller host 4; the output end of the controller host 4 is communicatively connected to the relay 5 and the solenoid valve 6, and is used to analyze the electrical signal, judge the current driving state of the mining dump truck, and control the power on or off of the coil of the relay 5 based on the driving state of the mining dump truck. When the relay 5 receives the closing signal sent by the controller host 4, the solenoid valve 6 control signal sent by the controller host 4 passes through the relay 5, and then controls the solenoid valve 6 to change direction; the solenoid valve 6 realizes the change of the valve core position based on the closing or opening of the normally open contact of the relay 5; the hydraulic oil circuit of the mechanical locking subsystem is controlled to be on and off according to the valve core position of the solenoid valve 6.

[0038] In this embodiment, the rotation speed sensor comprises at least a first rotation speed sensor 3.1 and a second rotation speed sensor 3.2, which respectively collect the movement states of the front and rear drive wheels of the mining dump truck.

[0039] In this embodiment, it also includes: a display 9, which is connected to the controller host 4 via CAN communication, and is used to receive the data analysis results of the controller host 4 and display the status information of the mining dump truck according to the data analysis results.

[0040] In this embodiment, the mechanical locking subsystem includes: a hydraulic pump 1, a double-control multi-way valve group 2, a dump cylinder 7 and an oil tank 10; the oil inlet of the hydraulic pump 1 is connected to the oil tank 10, the oil outlet of the hydraulic pump 1 is connected to the a3 port of the solenoid valve 6, the b3 port of the solenoid valve 6 is connected to the P port of the double-control multi-way valve group 2, the A port of the double-control multi-way valve group 2 is connected to the rodless cavity of the dump cylinder 7, the B port of the double-control multi-way valve group 2 is connected to the rod cavity of the dump cylinder 7, and the T port of the double-control multi-way valve group 2 is connected to the oil tank 10.

[0041] In this embodiment, the double-control multi-way valve group 2 includes a one-way valve, a first safety valve, a first manual reversing valve 2.1 and a second manual reversing valve 2.2; the P port of the double-control multi-way valve group 2 is connected to the a1 port of the first manual reversing valve 2.1, the b1 port of the first manual reversing valve 2.1 is connected to the T port of the double-control multi-way valve group 2, the c1 port of the first manual reversing valve 2.1 is connected to the oil inlet of the one-way valve, the oil inlet of the first safety valve and the b2 port of the second manual reversing valve 2.2, and the one-way The oil outlet of the valve is connected with the a2 port of the second manual reversing valve 2.2, the c2 port of the second manual reversing valve 2.2 is connected with the oil outlet of the first safety valve, the e2 port of the second manual reversing valve 2.2 and the T port of the double-control multi-way valve group 2, the d2 port of the second manual reversing valve 2.2 is connected with the A port of the double-control multi-way valve group 2, the f2 port of the second manual reversing valve 2.2 is connected with the B port of the double-control multi-way valve group 2, and the oil outlet of the first safety valve is connected with the T port of the double-control multi-way valve group 2.

[0042] In this embodiment, the first manual reversing valve 2.1 is a two-position three-way reversing valve, and the second manual reversing valve 2.2 is a three-position six-way reversing valve.

[0043] In this embodiment, it also includes: a second safety valve 11 installed between the oil outlet of the hydraulic pump 1 and the oil tank 10, which is used to limit the overload operation of the mechanical locking subsystem.

[0044] The present invention provides another embodiment:

[0045] like Figure 2 As shown, a mining dump truck is equipped with the locking control system of the mining dump truck cargo box 14 described in the previous embodiment, and also includes a front frame 12, a rear frame 13 and a cargo box 14;

[0046] The front frame 12 and the rear frame 13 are connected by a central hinge to form a vehicle frame assembly, and the cargo box 14 is installed and connected to the rear frame 13 through a slewing support, and the cargo box 14 can realize flipping movement around the slewing support; the hydraulic pump 1 is arranged on the front frame 12 and connected to the engine assembly of the mining dump truck, the double-control multi-way valve group 2 is installed in the cab of the mining dump truck, the speed sensor is arranged above the drive axle mounting seat of the front and rear frames 13 respectively, the controller host 4 is installed and fixed on the front frame 12, the solenoid valve 6 is installed on the rear side of the front frame 12, the relay 5 is connected in series between the controller host 4 and the solenoid valve 6 connection circuit, the safety valve is installed behind the hydraulic pump 1, the cylinder bottom of the dump cylinder 7 is hingedly connected to the rear frame 13, the piston rod of the dump cylinder 7 is hingedly connected to the cargo box 14, the data acquisition module 8 is installed on the front frame 12, and the display 9 is installed and fixed in the cab of the mining dump truck.

[0047] Working principle:

[0048] The first speed sensor 3.1 and the second speed sensor 3.2 collect the speed data of the front and rear driving wheels of the mining dump truck in real time, and send the collected speed data to the data acquisition module 8, and then the data acquisition module 8 transmits the speed data to the controller host 4 to determine the state of the mining dump truck.

[0049] When the mining dump truck needs to load and unload materials, and the speed data collected by the first speed sensor 3.1 and the second speed sensor 3.2 are both zero, the mining dump truck is in a stationary state, and the controller host 4 outputs two control signals, one is a relay 5 closing signal, and the other is a solenoid valve 6 control signal. After receiving the signal, the relay 5 closes, and the solenoid valve 6 control signal controls the solenoid valve 6 to change direction after passing through the relay 5. The solenoid valve 6 is in a working state, and the mechanical locking subsystem is connected. The hydraulic pump 1 outputs high-pressure oil driven by the vehicle engine. After the high-pressure oil passes through the solenoid valve 6, it enters the double-control multi-way valve group 2 through the P port; when the mining dump truck needs to unload materials, the operator manually controls the first manual reversing valve 2.1 in the double-control multi-way valve group 2 in the cab to change upward, and controls the second manual reversing valve 2.2 to change downward. At this time, the hydraulic The oil flows in from the P port, flows through the first manual reversing valve 2.1 and the one-way valve, flows into the second manual reversing valve 2.2 from a2, then flows out from the d2 port, and then flows into the rodless chamber of the dump cylinder 7 through the A port of the double-control multi-way valve group 2, pushing the piston rod to extend, and the cargo box 14 is lifted under the push of the piston rod. At this time, the cargo box 14 is lifted and unloaded; when the mining dump truck is needed to load, the operator manually controls the first manual reversing valve 2.1 and the second manual reversing valve 2.2 in the double-control multi-way valve group 2 in the cab to reverse upward. At this time, the hydraulic oil flows in from the P port, flows through the first manual reversing valve 2.1 and the one-way valve, flows into the second manual reversing valve 2.2 from a2, then flows out from the f2 port, and then flows into the rod chamber of the dump cylinder 7 through the B port of the double-control multi-way valve group 2. The piston rod of the dump cylinder 7 is retracted under the action of the high-pressure oil, and the cargo box 14 falls back.

[0050] When the speed data collected by the first speed sensor 3.1 and the second speed sensor 3.2 is not zero, the data acquisition module 8 transmits the speed data to the controller host 4. The controller host 4 determines that the current mining dump truck is in a transport condition. At this time, the controller host 4 only outputs one control signal to the relay 5, and the control relay 5 is disconnected. The solenoid valve 6 cannot receive the control signal. The solenoid valve 6 is switched to a disconnected state under the action of the spring, cutting off the oil circuit connection between the hydraulic pump 1 and the double-control multi-way valve group 2. The hydraulic pump 1 outputs flow to open the second safety valve 11, so that the high-pressure oil flows out of the hydraulic pump 1 and flows back to the oil tank 10 through the second safety valve 11. At this time, no high-pressure oil flows into the double-control multi-way valve group 2, and the dump cylinder 7 of the double-control multi-way valve group 2 does not operate, and the cargo box 14 cannot be lifted.

[0051] The embodiment of the present invention designs a mining dump truck and its cargo box locking control system, which determines the running state of the vehicle by collecting the wheel speed data of the front and rear driving wheels of the mining dump truck. When the vehicle is in the transport state, the electrical locking is realized by cutting off the solenoid valve control signal to avoid safety accidents such as damage to facilities and loss of life caused by automatic lifting of the cargo box during the driving of the vehicle; when the vehicle is in a stationary state, it is also necessary to simultaneously operate the first manual reversing valve and the second manual reversing valve of the double-control multi-way valve group to realize the lifting and lowering control of the cargo box to prevent the erroneous operation of a single handle during the loading and unloading of materials by the vehicle, which causes the cargo box to move, and has mechanical locking.

[0052] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A locking control system for a cargo box of a mining dump truck, characterized in that: include: An electronic locking subsystem, a mechanical locking subsystem, and a solenoid valve (6) shared by the two systems; The electronic locking subsystem is used to monitor the vehicle speed of the mining dump truck, and control the switching of the solenoid valve (6) according to the vehicle speed, and control the opening and closing of the hydraulic oil circuit of the mechanical locking subsystem according to the valve core position of the solenoid valve (6); The mechanical locking subsystem comprises a double-control multi-way valve group (2), and the two multi-way valves in the double-control multi-way valve group (2) are used to coordinate the switching of directions, thereby driving the lifting cylinder of the cargo box (14) to move, so as to realize the lifting or lowering action of the cargo box (14).

2. The locking control system of the cargo box of a mining dump truck according to claim 1 is characterized in that: The electronic locking subsystem comprises: a data acquisition module (8), a controller host (4), a rotation speed sensor and a relay (5); The speed sensor is used to collect the speed data of the driving wheels of the mining dump truck in real time; The data acquisition module (8) is used to collect the rotation speed data collected by the rotation speed sensor and convert the rotation speed data into an electrical signal that can be received by the controller host (4); The controller host (4) is used to analyze the electrical signal, determine the current driving state of the mining dump truck, and control the power on or off of the coil of the relay (5) based on the driving state of the mining dump truck; The solenoid valve (6) changes the valve core position based on the closing or opening of the normally open contact of the relay (5); The on-off of the hydraulic oil circuit of the mechanical locking subsystem is controlled according to the valve core position of the solenoid valve (6).

3. The locking control system of the cargo box of a mining dump truck according to claim 2 is characterized in that: Also includes: A display (9) is used to receive the data analysis results of the controller host (4) and display the status information of the mining dump truck according to the data analysis results.

4. The locking control system of the cargo box of a mining dump truck according to claim 1 is characterized in that: The mechanical locking subsystem comprises: a hydraulic pump (1), a double-control multi-way valve group (2), a self-unloading cylinder (7) and an oil tank (10); The oil inlet of the hydraulic pump (1) is connected to the oil tank (10), the oil outlet of the hydraulic pump (1) is connected to the a3 port of the solenoid valve (6), the b3 port of the solenoid valve (6) is connected to the P port of the double-control multi-way valve group (2), the A port of the double-control multi-way valve group (2) is connected to the rodless cavity of the self-unloading cylinder (7), the B port of the double-control multi-way valve group (2) is connected to the rod cavity of the self-unloading cylinder (7), and the T port of the double-control multi-way valve group (2) is connected to the oil tank (10).

5. The locking control system for a cargo box of a mining dump truck according to claim 4, characterized in that: The double-control multi-way valve group (2) comprises a one-way valve, a first safety valve, a first manual reversing valve (2.1) and a second manual reversing valve (2.2); The P port of the double-control multi-way valve group (2) is connected to the a1 port of the first manual reversing valve (2.1), the b1 port of the first manual reversing valve (2.1) is connected to the T port of the double-control multi-way valve group (2), the c1 port of the first manual reversing valve (2.1) is connected to the oil inlet of the check valve, the oil inlet of the first safety valve and the b2 port of the second manual reversing valve (2.2), the oil outlet of the check valve is connected to the a2 port of the second manual reversing valve (2.2), and the The c2 port of the second manual reversing valve (2.2) is connected to the oil outlet of the first safety valve, the e2 port of the second manual reversing valve (2.2) and the T port of the double-control multi-way valve group (2); the d2 port of the second manual reversing valve (2.2) is connected to the A port of the double-control multi-way valve group (2); the f2 port of the second manual reversing valve (2.2) is connected to the B port of the double-control multi-way valve group (2); and the oil outlet of the first safety valve is connected to the T port of the double-control multi-way valve group (2); When the hydraulic oil circuit of the mechanical locking subsystem is connected, the first manual reversing valve (2.1) is operated to reverse upward, and the second manual reversing valve (2.2) is operated to reverse downward. At this time, the hydraulic oil flows in from the P port, flows through the first manual reversing valve (2.1) and the one-way valve, flows into the second manual reversing valve (2.2) from a2, then flows out from the d2 port, and then flows into the rodless chamber of the self-unloading cylinder (7) through the A port of the double-control multi-way valve group (2). At this time, the cargo box (14) is lifted and unloaded; When the cargo box (14) has finished unloading, the second manual reversing valve (2.2) is operated to reverse upward. At this time, the hydraulic oil flows in from the P port, flows through the first manual reversing valve (2.1) and the one-way valve, flows into the second manual reversing valve (2.2) from a2, then flows out from the f2 port, and then flows into the rod chamber of the self-unloading cylinder (7) through the B port of the double-control multi-way valve group (2). At this time, the cargo box (14) falls back.

6. The locking control system of the cargo box of a mining dump truck according to claim 5, characterized in that: The first manual reversing valve (2.1) is a two-position three-way reversing valve, and the second manual reversing valve (2.2) is a three-position six-way reversing valve.

7. The locking control system of the cargo box of a mining dump truck according to claim 4, characterized in that: Also includes: The second safety valve (11) is installed between the oil outlet of the hydraulic pump (1) and the oil tank (10) and is used to limit the overload operation of the mechanical locking subsystem.

8. A mining dump truck, characterized in that: A mining dump truck cargo box locking control system according to any one of claims 1 to 7 is installed, and further comprises a front frame (12), a rear frame (13) and a cargo box (14); The front frame (12) and the rear frame (13) are connected by a central hinge to form a vehicle frame assembly. The cargo box (14) is connected to the rear frame (13) by a slewing support. The hydraulic pump (1) is arranged on the front frame (12) and connected to the engine assembly of the mining dump truck. The double-control multi-way valve group (2) is installed in the cab of the mining dump truck. The speed sensors are arranged above the drive axle mounting seats of the front and rear frames (13) respectively. The controller host (4) is installed and fixed on the front frame (12). 12), the solenoid valve (6) is installed on the rear side of the front frame (12), the relay (5) is connected in series between the controller host (4) and the solenoid valve (6) connection circuit, the safety valve is installed behind the hydraulic pump (1), the cylinder bottom of the dump cylinder (7) is hingedly connected to the rear frame (13), the piston rod of the dump cylinder (7) is hingedly connected to the cargo box (14), the data acquisition module (8) is installed on the front frame (12), and the display (9) is installed and fixed on the cab of the mining dump truck.

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