Resistance grid maintenance protection system, protection method and mining dump truck

Abstract

The invention discloses a resistance grid maintenance protection system, a protection method and a mining dump truck. The system comprises a maintenance guardrail, a front handrail and a maintenance door, the access door is constructed to be in a closed state, an open state and a falling state; in the closed state, the access door is located at the access opening, and the access door and the front handrail are locked together; in the falling state, when the temperature value at the resistance grid air outlet is smaller than a preset temperature value, the access door is hung at the resistance grid air outlet, and the access door forms a first channel for entering and exiting the upper portion of the resistance grid; in the opening state, when the temperature value of the air outlet of the resistance grid is larger than the preset temperature value, the access door is located at the access opening, and an outlet is reserved between the access door and the front handrail; and the outlet and a pedal fixed on the resistance grid form a second channel for entering and exiting the upper part of the resistance grid. The periphery of the resistor grid is completely protected, so that the falling risk of personnel during maintenance at the upper part of the resistor grid is avoided; the multifunctional access door is arranged to prevent people from being scalded when the temperature of the air outlet is too high and getting up and down the resistance grid.

Description

Technical Field

[0001] The present invention relates to a resistance grid maintenance and protection system for mining dump trucks, belonging to the technical field of mining dump trucks. Background Art

[0002] The resistance grid of a mining dump truck is installed on the right deck, at a relatively high distance from the ground. For the maintenance of high-power resistance grids, personnel need to operate on the top of the resistance grid. To ensure the safety of personnel operations, protective structures such as guardrails and upper and lower pedals need to be installed around the resistance grid. When the deck space is limited and the air outlets of high-power resistance grids are arranged in the front-rear direction of the vehicle, due to the high temperature at the air outlet, personnel are easily scalded when going up and down the resistance grid, and installing a guardrail in front of the resistance grid will affect the field of view of the right rearview mirror. Therefore, the existing resistance grid protection structure is usually a partial guardrail installation structure form, and there is still a risk of falling at the unprotected part. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a resistance grid maintenance and protection system. The maintenance door can achieve three states: closed, open, and lowered. The lowered state provides a common first passage, and the open state has a smaller opening and is only used as an emergency second passage to prevent personnel from being scalded when going up and down the resistance grid when the temperature at the air outlet is too high.

[0004] The present invention is implemented according to the following technical solutions:

[0005] In a first aspect, the present invention discloses a resistance grid maintenance and protection system, which is mainly applied to engineering vehicles and includes:

[0006] A maintenance guardrail, arranged on the top surface of the resistance grid and surrounding it;

[0007] A front railing, arranged on the periphery of the top surface of the resistance grid, with a maintenance opening left between it and the maintenance guardrail;

[0008] A maintenance door, which is configured in three usage states, namely:

[0009] Closed state: The maintenance door is located at the maintenance opening. One side of the maintenance door is hinged to the maintenance guardrail, and the other side is locked to the front railing through a door lock component;

[0010] Lowered state: When the temperature value at the air outlet of the resistance grid is less than a preset temperature value, the maintenance door is located at the air outlet of the resistance grid. The top end of the maintenance door is hinged to the top surface of the resistance grid, and the bottom end is close to the bottom of the resistance grid; the maintenance door realizes the function of a ladder, and as a whole, it constitutes a first passage for entering and exiting the upper part of the resistance grid;

[0011] Open state: When the temperature value at the air outlet of the resistance grid is greater than the preset temperature value, the inspection door is located at the inspection opening. One side of the inspection door is hinged to the inspection guardrail, and there is an exit between the other side and the front railing; the exit and the pedal fixed on the resistance grid together form the second passage for entering and exiting the upper part of the resistance grid.

[0012] In some embodiments, a control system composed of multiple control units controls the opening and falling actions of the inspection door according to the temperature at the air outlet of the resistance grid; when the temperature value at the air outlet of the resistance grid is less than the preset temperature value, the inspection ladder is in the falling state, and maintenance personnel can enter and exit the upper part of the resistance grid through the first passage; when the temperature value at the air outlet of the resistance grid is greater than the preset temperature value, the inspection ladder is in the open state, and maintenance personnel can only enter and exit the upper part of the resistance grid through the second passage.

[0013] In some embodiments, an ear plate with a pin hole is fixed on the upper part of the inspection door close to the inspection guardrail;

[0014] The first control unit includes:

[0015] A temperature sensor, installed at the air outlet of the resistance grid, for detecting the temperature at the air outlet of the resistance grid;

[0016] A temperature control switch, fixed on the inspection guardrail above the ear plate and electrically connected to the temperature sensor. The pin of the temperature control switch is arranged coaxially with the pin hole. By detecting the temperature at the air outlet of the resistance grid, when the temperature is high, the pin of the temperature control switch extends out and rotates and fixes with the ear plate, and when the temperature is low, the pin of the temperature control switch retracts and disengages from the ear plate.

[0017] In some embodiments, horizontal rotation connection structures and up-and-down flip limit structures are fixed on both sides of the inspection door close to the top surface of the resistance grid;

[0018] The second control unit includes:

[0019] A horizontal rotation drive unit, fixed at the lower part of the inspection guardrail close to the inspection door. The rotation drive shaft of the horizontal rotation drive unit is coaxial with the pin of the temperature control switch, and together they form the horizontal rotation axis of the inspection door;

[0020] An up-and-down flip drive unit, fixedly connected to the rotation drive shaft of the horizontal rotation drive unit. The rotation drive shaft of the up-and-down flip drive unit is fixedly connected to the horizontal rotation connection structure;

[0021] An up-and-down flip limit pin with a position detection function, fixed on the top surface of the resistance grid close to the up-and-down flip limit structure. When it is detected that the inspection door is in the open state, the up-and-down flip limit pin extends out and rotates and fixes with the up-and-down flip limit structure. The up-and-down flip limit pin is coaxial with the rotation drive shaft of the up-and-down flip drive unit, and together they form the up-and-down flip axis of the inspection door.

[0022] In some embodiments, an opening limiting plate is fixedly installed near the middle of the front railing on the access door.

[0023] The third control unit includes:

[0024] A fixing pin under the access door with a position detection function is fixed on the side of the resistance grid. When it is detected that the access door is in the lowered state, the fixing pin under the access door extends into the hole of the opening limiting plate to keep the access door in a fixed state.

[0025] In some embodiments, a manual door lock is installed near the middle of the front railing close to the access door. When the access door is in the closed state, the manual door lock clamps the opening limiting plate; a start button for the access door is also installed on the front railing. After opening the manual door lock and pressing the start button, the control system controls the access door to be in the lowered state or the opened state.

[0026] In some embodiments, the access door mainly consists of a ∩-shaped frame and cross bars that are evenly spaced up and down and fixed in the ∩-shaped frame; an anti-slip tooth-shaped structure is provided on the lower side of the cross bars. When the access door is in the lowered state, the cross bars serve as anti-slip treads.

[0027] In some embodiments, handrails for facilitating maintenance personnel to get on and off the resistance grid are provided on the front railing; and / or,

[0028] Handrails for facilitating maintenance personnel to get on and off the resistance grid are provided at the part of the maintenance guardrail close to the access door; and / or,

[0029] A kick plate is arranged around the perimeter of the top surface of the resistance grid, and the kick plate is fixedly connected to the maintenance guardrail by bolts.

[0030] In some embodiments, the resistance grid is located on the right side of the deck, and a right rearview mirror is installed near the resistance grid; the cab is located on the left side of the deck, and a left rearview mirror is installed near the cab; the access door in the closed state is arranged at a predetermined angle perpendicular to the vehicle driving direction, and the front railing is arranged flush with the access door to ensure that the driver's view of the right rearview mirror from the cab is unobstructed.

[0031] In a second aspect, the present invention discloses a mining dump truck, including a resistance grid, and the above-mentioned resistance grid maintenance and protection system is installed on the resistance grid.

[0032] In a third aspect, the present invention discloses a method for maintaining and protecting a resistance grid:

[0033] Install a maintenance guardrail and a front railing around the perimeter of the top surface of the resistance grid, and leave a maintenance opening between the two. Install an access door at the maintenance opening.

[0034] When personnel do not need to repair the resistance grid or are repairing on top of the resistance grid, the maintenance door is locked with the front railing through a manual door lock. At this time, the maintenance door remains closed and plays a protective role;

[0035] When the temperature value at the air outlet of the resistance grid is greater than the preset temperature value and personnel need to enter or exit the top of the resistance grid, open the manual door lock and start the control system through the start button to open the maintenance door, leaving an exit between the maintenance door and the front railing. Personnel can only enter the top of the resistance grid for maintenance through the pedal under the front railing and the exit to form a second passage;

[0036] When the temperature value at the air outlet of the resistance grid is less than the preset temperature value and personnel need to enter or exit the top of the resistance grid, open the manual door lock and start the control system through the start button to open and lower the maintenance door. The maintenance door is suspended at the air outlet of the resistance grid. At this time, the maintenance door functions as a ladder, and personnel can enter the top of the resistance grid for maintenance through the maintenance door to form a first passage.

[0037] In some embodiments, handrails are installed on both the maintenance guardrail and the front railing for personnel to grasp when passing through the first passage and the second passage; a kickboard is installed around the top surface of the resistance grid to prevent maintenance tools on the upper part of the resistance grid from slipping.

[0038] Advantages of the present invention:

[0039] Compared with the existing structural form of adding a guardrail to the resistance grid part of a mining dump truck, the resistance grid maintenance and protection system in the present invention protects all around the resistance grid and is provided with a multi-functional maintenance door, fully avoiding the risk of personnel falling when repairing on the upper part of the resistance grid;

[0040] The maintenance door in the resistance grid maintenance and protection system of the present invention can achieve three states: closed, open, and lowered. When the maintenance door is in the lowered state, it functions as a ladder and provides a common first maintenance passage; when the maintenance door is in the open state, it serves as a second maintenance passage when the first maintenance passage cannot be used due to the high temperature at the air outlet, thus fully ensuring the emergency maintenance work of the resistance grid.

[0041] The control system in the resistance grid maintenance and protection system of the present invention can control the opening and lowering of the maintenance door according to the temperature at the air outlet of the resistance grid, preventing personnel from being scalded when going up and down the resistance grid when the temperature at the air outlet is too high.

[0042] The maintenance door in the resistance grid maintenance and protection system of the present invention is arranged at a certain angle with the left and right directions of the vehicle, which can ensure that the field of view of the driver's right rearview mirror is not blocked. Description of the drawings

[0043] The accompanying drawings, as part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not unduly limit the present invention. Obviously, the accompanying drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0044] In the accompanying drawings:

[0045] Figure 1 is the structural diagram of the resistance grid maintenance protection system of the present invention (the maintenance door is in the closed state);

[0046] Figure 2 is the structural diagram of the maintenance door of the present invention;

[0047] Figure 3 is the structural diagram of the resistance grid maintenance protection system of the present invention (the maintenance door is in the open state);

[0048] Figure 4 is the structural diagram of the resistance grid maintenance protection system of the present invention (the maintenance door is in the lowered state);

[0049] Figure 5 is the overall vehicle installation structural diagram of the resistance grid maintenance protection system of the present invention.

[0050] Reference numerals in the accompanying drawings: 1 maintenance guardrail; 2 maintenance door; 3 front railing; 4 control system; 5 temperature control switch; 6 horizontal rotation drive unit; 7 up and down flipping drive unit; 8 up and down flipping limit pin; 9 fixed pin under the maintenance door; 10 pedal; 11 manual door lock; 12 handrail; 13 kick plate; 14 resistance grid; 15 start button; 16 handrail; 17 ear plate; 18 horizontal rotation connection structure; 19 up and down flipping limit structure; 20 opening limit plate; 21 cross bar.

[0051] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed embodiments

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0053] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0054] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0055] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 As shown, the present invention provides a resistance grid maintenance and protection system for use on mining dump trucks, comprising an inspection guardrail 1, an inspection door 2, a front rail 3, and a control system 4. The inspection door 2 is connected at an angle to the front side of the inspection guardrail 1 to ensure that the driver's right rearview mirror's field of view is unobstructed. The inspection door 2 can be in three states: closed, open, and down, depending on different needs. The down state provides a commonly used first passage; the open state has a smaller opening and serves only as a second passage for emergency use. The inspection door 2 has an ear plate 17 with a pin hole on its upper portion. The lower portion of the inspection door 2 has horizontal rotating connection structures 18 and up-and-down flip limit structures 19 on its left and right sides, and a perforated limit plate 20 in the middle. The inspection door 2 primarily consists of a ∩-shaped frame and a horizontal bar 21 fixed to the ∩-shaped frame, evenly spaced above and below. The lower side of the horizontal bar 21 is provided with an anti-slip toothed structure. When the inspection door 2 is in the down state, the horizontal bar 21 serves as an anti-slip pedal, forming the first passage as a whole.

[0056] From the above, it can be seen that the inspection door in the resistance grid maintenance and protection system of the present invention can be realized in three states: closed, open and dropped. When the inspection door is in the dropped state, the inspection door realizes the function of a ladder and provides a commonly used first inspection channel; when the inspection door is in the open state, it serves as a second inspection channel when the outlet temperature is high and the first inspection channel cannot be used, thereby fully ensuring the emergency maintenance work of the resistance grid.

[0057] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5As shown in the figure, the front railing 3 is integrally fixed to the left front side of the resistor grid 14 and is arranged flush with the maintenance door 2. A pedal 10 is provided at the lower part of the front railing 3, and a handrail 12 is provided on the left side. When the maintenance door 2 is in the open state, it forms a second passage. A manual door lock 11 is installed on one side of the middle part of the front railing 3 close to the maintenance door 2. When the maintenance door is in the closed state, the manual door lock 11 is clamped to the opening limiting plate 20 in the middle of the maintenance door 2 to ensure that the maintenance door 2 will not be abnormally opened. A start button 15 for the maintenance door 2 is installed in the middle of the front railing 3.

[0058] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown in the figure, the maintenance guardrail 1 is installed on the front, rear and right sides of the resistor grid 14 by bolts. A handrail 16 is provided on the left front side of the maintenance guardrail 1 for people to hold when passing through the first passage. The maintenance guardrail 1 is connected to the maintenance door 2 through a temperature control switch 5 and a horizontal rotation drive unit 6 fixed on the left front column. A skirting board 13 is installed around the top surface of the resistor grid 14, and the skirting board 13 is fixedly connected to the maintenance guardrail 1 by bolts to prevent tools from slipping on the upper part of the resistor grid 14.

[0059] As can be seen from the above, compared with the structural form of adding guardrails to the resistor grid part of the existing mining dump truck, the resistor grid maintenance protection system in the present invention protects all around the resistor grid and is provided with a multi-functional maintenance door, which fully avoids the risk of personnel falling when maintaining the upper part of the resistor grid.

[0060] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown in the figure, the control system 4 includes multiple control units. Among them, a temperature sensor is installed at the air outlet of the resistance grid to detect the temperature at the air outlet of the resistance grid. The temperature control switch 5 is fixed on the upper part of the left front column of the maintenance guardrail 1. By detecting the temperature at the air outlet of the resistance grid, when the temperature is high, the pin of the temperature control switch 5 extends out and rotates and fixes with the ear plate 17 with a pin hole. When the temperature is low, the pin of the temperature control switch 5 retracts and disengages from the ear plate 17 with a pin hole. The horizontal rotation drive unit 6 is fixed on the lower part of the left front column of the maintenance guardrail 1. The rotation drive shaft of the horizontal rotation drive unit 6 is coaxial with the pin of the temperature control switch 5, and together they form the horizontal rotation shaft of the maintenance door 2. The up and down flipping drive unit 7 is fixedly connected to the rotation drive shaft of the horizontal rotation drive unit 6. The rotation drive shaft of the up and down flipping drive unit 7 is fixedly connected to the horizontal rotation connection structure 18 of the maintenance door. The up and down flipping limit pin 8 with position detection function is fixed on the upper part of the front side of the resistance grid 14. When it detects that the maintenance door 2 is in the open state, the up and down flipping limit pin 8 extends out and rotates and fixes with the up and down flipping limit structure 19 of the maintenance door. At this time, the up and down flipping limit pin 8 is coaxial with the rotation drive shaft of the up and down flipping drive unit 7, and together they form the up and down flipping shaft of the maintenance door 2. The fixed pin 9 under the maintenance door with position detection function is fixed in the middle of the front side of the resistance grid 14. When it detects that the maintenance door 2 is in the lowered state, the fixed pin 9 under the maintenance door extends into the hole of the maintenance door opening limit plate 20 to keep the maintenance door 2 in a fixed state.

[0061] As can be seen from the above, the control system in the resistance grid maintenance protection system of the present invention can control the opening and lowering of the maintenance door according to the temperature at the air outlet of the resistance grid, preventing personnel from being scalded when getting on and off the resistance grid when the temperature at the air outlet is too high.

[0062] The main control principle of the resistance grid maintenance protection system is as follows:

[0063] Open the manual door lock 11 → start button 15 → horizontal rotation drive unit 6 starts → maintenance door 2 opens to the left and right horizontal state → up and down flipping limit pin 8 extends out and rotates and fixes with the up and down flipping limit structure 19 of the maintenance door → detect that the temperature at the air outlet is safe → the pin of the temperature control switch 5 retracts → up and down flipping drive unit 7 starts → maintenance door 2 lowers → the fixed pin 9 under the maintenance door extends into the hole of the maintenance door opening limit plate 20 → personnel enter the upper part of the resistance grid 14 through the first passage.

[0064] Open the manual door lock 11 → start button 15 → horizontal rotation drive unit 6 starts → maintenance door 2 opens to the left and right horizontal state → up and down flipping limit pin 8 extends out and rotates and fixes with the up and down flipping limit structure 19 of the maintenance door → detect that the temperature at the air outlet is too high → the pin of the temperature control switch 5 does not retract → personnel enter the upper part of the resistance grid 14 through the second passage.

[0065] The present invention also provides a method for maintaining and protecting a resistance grid, which is specifically as follows:

[0066] As Figure 1 shown, when personnel do not need to repair the resistance grid 14 or are repairing on top of the resistance grid 14, the inspection door 2 is locked together with the front railing 3 through the manual door lock 11. At this time, the inspection door 2 remains closed and plays a protective role; As Figure 3 shown, when the temperature of the air outlet of the resistance grid 14 is too high and personnel need to enter and exit the top of the resistance grid 14, open the manual door lock 11 and start the control system 4 through the start button 15 to realize the opening action of the inspection door 2, leaving an exit between it and the front railing 3. Personnel can enter the top of the resistance grid 14 for inspection only through the pedal 10 under the front railing 3 and the exit to form a second passage; As Figure 4 shown, when the temperature of the air outlet of the resistance grid 14 drops to a safe temperature and personnel need to enter and exit the top of the resistance grid 14, open the manual door lock 11 and start the control system 4 through the start button 15 to realize the opening and falling actions of the inspection door 2. The inspection door 2 is suspended at the air outlet of the resistance grid 14. At this time, the inspection door 2 realizes the ladder function, and personnel can enter the top of the resistance grid 14 for inspection through the inspection door 2 to form a first passage.

[0067] In summary, the present invention provides a resistance grid inspection and protection system and a protection method, achieving the following functions and effects:

[0068] 1. Compared with the existing structural form of adding guardrails to the resistance grid of mining dump trucks, the resistance grid inspection and protection system in the present invention protects all around the resistance grid and sets a multi-functional inspection door, fully avoiding the risk of personnel falling when repairing on the upper part of the resistance grid;

[0069] 2. The inspection door in the resistance grid inspection and protection system of the present invention can achieve three states: closed, open, and fallen. When the inspection door is in the fallen state, the inspection door realizes the ladder function and provides the common first inspection passage; when the inspection door is in the open state, it serves as the second inspection passage when the first inspection passage cannot be used due to the high temperature of the air outlet, thus fully ensuring the emergency inspection work of the resistance grid.

[0070] 3. The control system in the resistance grid inspection and protection system of the present invention can control the opening and falling of the inspection door according to the temperature at the air outlet of the resistance grid, preventing personnel from being scalded when getting on and off the resistance grid when the temperature of the air outlet is too high.

[0071] 4. The inspection door in the resistance grid inspection and protection system of the present invention is arranged at a certain angle with the left and right directions of the vehicle, which can ensure that the field of view of the driver's right rearview mirror is not blocked.

[0072] The mining dump truck provided by the present invention will be described below. The mining dump truck described below can be mutually corresponding and referred to the resistance grid inspection and protection system described above.

[0073] The dump truck for mining provided by the present invention may include the barrier maintenance protection system as described in any one of the above embodiments.

[0074] The beneficial effects achieved by the dump truck for mining provided by the present invention are consistent with those achieved by the barrier maintenance protection system provided by the present invention, and thus will not be elaborated herein.

[0075] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0076] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features contained in other embodiments rather than other features, the combination of the features of different embodiments also means that it is within the protection scope of the present invention and forms different embodiments. For example, in the above embodiments, those skilled in the art can use them in a combined manner according to the known technical solutions and the technical problems to be solved by the present application.

[0077] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art of this patent can make some modifications or decorations equivalent to changes within the scope of the technical solution of the present invention by using the technical content prompted above. However, any simple modification, equivalent change, and decoration made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the present invention.

Claims

1. A resistance grid maintenance and protection system, mainly applied to engineering vehicles, characterized in that, Comprising: An inspection guardrail, arranged on the top surface of the resistance grid and surrounding it; A front railing, arranged on the periphery of the top surface of the resistance grid, with an inspection opening left between it and the inspection guardrail; An inspection door, configured to have three usage states, namely: Closed state: The inspection door is located at the inspection opening, one side of the inspection door is hinged to the inspection guardrail, and the other side is locked to the front railing; Falling state: When the temperature value at the air outlet of the resistance grid is less than the preset temperature value, the inspection door is suspended at the air outlet of the resistance grid, and the inspection door realizes the function of a ladder, and together they form the first passage for entering and exiting the upper part of the resistance grid; Open state: When the temperature value at the air outlet of the resistance grid is greater than the preset temperature value, the inspection door is located at the inspection opening, one side of the inspection door is hinged to the inspection guardrail, and there is an exit left between the other side and the front railing; The exit and the pedal fixed on the resistance grid together form the second passage for entering and exiting the upper part of the resistance grid.

2. The resistor grid inspection and protection system according to claim 1, characterized in that: A control system composed of multiple control units controls the opening and falling actions of the inspection door according to the temperature at the air outlet of the resistance grid.

3. The inspection and protection system for a resistive grid according to claim 2, wherein: An ear plate with a pin hole is fixed on the upper part of the inspection door close to the inspection guardrail; The first control unit includes: A temperature sensor, installed at the air outlet of the resistance grid, for detecting the temperature of the air outlet of the resistance grid; A temperature control switch, fixed on the inspection guardrail above the ear plate and electrically connected to the temperature sensor. The pin of the temperature control switch is arranged coaxially with the pin hole. By detecting the temperature of the air outlet of the resistance grid, the pin of the temperature control switch extends and rotates to fix with the ear plate at high temperature, and the pin of the temperature control switch retracts and disengages from the ear plate at low temperature.

4. The resistor grid maintenance and protection system according to claim 3, characterized in that: Horizontal rotation connection structures and up-and-down flip limit structures are fixed on both sides of the inspection door close to the top surface of the resistance grid; The second control unit includes: A horizontal rotation drive unit, fixed at the lower part of the inspection guardrail close to the inspection door. The rotation drive shaft of the horizontal rotation drive unit is coaxial with the pin of the temperature control switch, and together they form the horizontal rotation axis of the inspection door; An up-and-down flip drive unit, fixedly connected to the rotation drive shaft of the horizontal rotation drive unit. The rotation drive shaft of the up-and-down flip drive unit is fixedly connected to the horizontal rotation connection structure; An up-and-down flip limit pin with a position detection function, fixed on the top surface of the resistance grid close to the up-and-down flip limit structure. When it is detected that the inspection door is in the open state, the up-and-down flip limit pin extends and rotates to fix with the up-and-down flip limit structure. The up-and-down flip limit pin is coaxial with the rotation drive shaft of the up-and-down flip drive unit, and together they form the up-and-down flip axis of the inspection door.

5. A resistance grid maintenance and protection system according to claim 2 or 3 or 4, characterized in that: An opening limit plate is fixed in the middle of the inspection door close to the front railing; The third control unit includes: An inspection door lower fixed pin with a position detection function, fixed on the side of the resistance grid. When it is detected that the inspection door is in the falling state, the inspection door lower fixed pin extends into the hole of the opening limit plate to keep the inspection door in a fixed state.

6. The inspection and protection system for a resistance grid according to claim 5, wherein: A manual door lock is installed in the middle of the front railing close to the inspection door. When the inspection door is in the closed state, the manual door lock clamps the opening limit plate; A start button for the maintenance door is also installed on the front railing. After the manual door lock is opened and the start button is pressed, the control system controls the maintenance door to be in the lowered state or the opened state.

7. A resistance grid maintenance and protection system according to claim 1, characterized in that: The maintenance door mainly consists of a ∩-shaped frame and cross bars that are evenly spaced up and down and fixed in the ∩-shaped frame; An anti-slip tooth-shaped structure is provided on the lower side of the cross bar. When the maintenance door is in the lowered state, the cross bar serves as an anti-slip pedal.

8. A resistance grid maintenance and protection system according to claim 1, characterized in that: Handrails for maintenance personnel to get on and off the resistance grid are provided on the front railing; and / or, Handrails for maintenance personnel to get on and off the resistance grid are provided at the part of the maintenance guardrail close to the maintenance door; and / or, A kick plate is arranged around the perimeter of the top surface of the resistance grid, and the kick plate is fixedly connected to the maintenance guardrail by bolts.

9. A resistance grid maintenance and protection system according to claim 1, characterized in that: The resistance grid is located on the right side of the deck, and a right rearview mirror is installed near the resistance grid; the cab is located on the left side of the deck, and a left rearview mirror is installed near the cab; The maintenance door in the closed state is arranged at a predetermined angle perpendicular to the vehicle driving direction, and the front railing is arranged flush with the maintenance door to ensure that the driver's view of the right rearview mirror from the cab is unobstructed.

10. A mining dump truck, including a resistance grid, characterized in that: The resistance grid is equipped with the resistance grid maintenance and protection system according to any one of claims 1 to 9.

11. A method for maintaining and protecting a resistance grid, characterized in that: A maintenance guardrail and a front railing are installed around the perimeter of the top surface of the resistance grid, and a maintenance opening is left between the two. A maintenance door is installed at the maintenance opening; When personnel do not need to maintain the resistance grid or are maintaining the top of the resistance grid, the maintenance door is locked to the front railing through a manual door lock. At this time, the maintenance door remains closed to play a protective role; When the temperature value at the air outlet of the resistance grid is greater than the preset temperature value and personnel need to enter and exit the top of the resistance grid, the manual door lock is opened, and the control system is activated through the start button to open the maintenance door. An exit is left between the maintenance door and the front railing. Personnel can enter the top of the resistance grid for maintenance only through the pedal under the front railing and the exit to form a second passage; When the temperature value at the air outlet of the resistance grid is less than the preset temperature value and personnel need to enter and exit the top of the resistance grid, the manual door lock is opened, and the control system is activated through the start button to open and lower the maintenance door. The maintenance door is suspended at the air outlet of the resistance grid. At this time, the maintenance door functions as a ladder, and personnel can enter the top of the resistance grid for maintenance through the maintenance door to form a first passage.

12. A method for maintaining and protecting a resistance grid according to claim 11, characterized in that: Handrails are installed on both the maintenance guardrail and the front railing for personnel to grasp when passing through the first passage and the second passage; A kick plate is installed around the perimeter of the top surface of the resistance grid to prevent maintenance tools on the upper part of the resistance grid from slipping.

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