A charging pile for a mine electric vehicle

Abstract

The application relates to the technical field of electric vehicle charging equipment, and discloses a charging pile for a mine-used electric vehicle. The application comprises a charging pile body, a charging gun connected to the charging pile body through a charging wire, and a gun seat arranged at the side of the charging pile body; a placing cavity for inserting the front end of the charging gun is formed in the gun seat; a dust blowing assembly is arranged in the placing cavity; a dust scraping lip is arranged at the entrance of the placing cavity; a shielding cap capable of moving to the terminal orifice area of the charging gun to shield the terminal orifice area is arranged on the inner side of the dust scraping lip; the dust scraping lip scrapes the dust on the periphery of the front end of the charging gun first; the shielding cap shields the terminal orifice area; the charging gun further pushes the contact block and compresses the air bag through the limiting disc, so that the airflow is guided to the collecting groove and the dust collecting bin along the periphery of the gun mouth through the annular air passage and the inclined spray plate; the gun seat can complete the dust cleaning on the periphery of the gun mouth while accommodating the charging gun, and the effect of not needing an external air source or manual wiping is achieved.

Description

Technical Field

[0001] This application relates to the field of electric vehicle charging equipment technology, and in particular to a charging pile for mining electric vehicles. Background Technology

[0002] When mining transport vehicles, electric mining trucks, and auxiliary operation vehicles in mining areas are charged in open or semi-open environments, there are usually a lot of mineral powder, mud, and fine dust around the charging pile. During repeated insertion, removal, dragging, and release of the charging gun, dust easily adheres to its front insulating shell, the outside of the gun nozzle, and the area near the terminal hole. If dust enters the gun base or the vicinity of the vehicle's charging interface with the charging gun for a long time, it will not only affect the smoothness of the charging gun insertion, but may also reduce the stability of the terminal contact, and increase the risk of local heating or reduced insulation performance during high-power charging.

[0003] Existing technologies include dust removal solutions for the heat dissipation vents or dust screens of charging pile cabinets. For example, the charging pile and automatic dust removal device with publication number CN223517165U cleans the dust screen of the charging pile through differential pressure detection, dust removal roller brush and transmission mechanism. This type of structure mainly solves the problem of dust accumulation in the ventilation and heat dissipation positions inside the pile. Some charging gun holders also use dust covers, sealing rings or elastic door panels to reduce the entry of external dust. However, their function is mainly to shield and seal, and it is difficult to actively clean the dust that has been attached to the front end of the charging gun during the process of inserting the charging gun back into the holder. If airflow is used to blow the end face of the gun nozzle directly, dust may be blown into the terminal hole. Summary of the Invention

[0004] This application proposes a charging pile for mining electric vehicles, which is more suitable for use in dusty environments where the front end of the charging gun is prone to dust accumulation, and can reduce the risk of dust being blown into the terminal hole. This solves the problem that the gun holder of existing mining charging piles is mostly only used for storing the charging gun and blocking the entrance, and cannot actively clean the dust around the gun nozzle when the charging gun is reinserted, and direct blowing can easily cause dust to enter the terminal hole.

[0005] To achieve the above objectives, this application adopts the following technical solution: a charging pile for a mining electric vehicle, including a charging pile body, a charging gun connected to the charging pile body via a charging cable, and a gun holder disposed on the side of the charging pile body. The gun holder forms a placement cavity for inserting the front end of the charging gun. A dust blowing component is provided in the placement cavity. A dust scraping lip is provided at the entrance of the placement cavity. A shielding cap is provided on the inner side of the dust scraping lip, which can move to block the terminal hole area of ​​the charging gun as the charging gun is re-inserted. The dust blowing assembly includes a compressed air bag that is compressed by the repositioning of the charging gun, an annular air passage that communicates with the compressed air bag and is used to guide air to the periphery of the charging gun nozzle, the outlet side of the annular air passage forms a dust sweeping outlet that guides the airflow downward toward the collection tank, and the inlet side of the annular air passage is provided with a pressure accumulator valve. When the accumulator valve is not open, it blocks the exhaust path of the compressed air bag to the annular ventilation channel, causing the gas discharged from the compressed air bag to accumulate pressure upstream of the accumulator valve. The charging pile is also equipped with a triggering structure that cooperates with the blocking action of the shield cap. After the shield cap blocks the terminal hole area, the triggering structure opens the accumulator valve, allowing the accumulator airflow to be guided down the annular ventilation channel along the periphery of the charging gun nozzle to the collection tank located at the bottom of the placement chamber and the dust collection bin connected to the collection tank.

[0006] Furthermore, the dust blowing assembly also includes a limiting plate connected to the front end of the compressed air bag and an air outlet cylinder disposed on one side of the limiting plate. An annular air passage is disposed at the end of the air outlet cylinder away from the limiting plate. The edge of the annular air passage is provided with a contact block located on the re-insertion path of the charging gun. When the charging gun is re-inserted, the contact block drives the annular air passage, the air outlet cylinder and the limiting plate to move backward synchronously to compress the compressed air bag.

[0007] Furthermore, the shield cap is connected to the guide rod via a connecting plate. The guide rod is slidably mounted on the dust scraper lip or gun base. A shield cap reset spring is sleeved on the guide rod. The shield cap reset spring is used to drive the shield cap to reset after the charging gun is pulled out. The front end face of the shield cap contacts or approaches the outer periphery of the end face where the charging gun terminal hole is located, and the shield cap does not extend into the terminal hole of the charging gun.

[0008] Furthermore, the triggering structure includes a trigger rod disposed on one side of the shielding cap and a trigger plate for opening the accumulator valve plate. After the shielding cap blocks the terminal hole area, the trigger rod drives the trigger plate to open the accumulator valve plate.

[0009] Furthermore, the outlet side of the annular vent is provided with an inclined spray plate that is tilted toward the collection tank. A trigger plate is disposed on the inclined spray plate, and the trigger rod is in contact with one side of the inclined spray plate. The inclined spray plate is a deformable structure at least at the position in contact with the trigger rod, so that when the trigger rod presses against it, it drives the trigger plate to deflect toward the accumulator valve plate.

[0010] Furthermore, the shielding cap moves from its initial position to the position of shielding the charging gun terminal orifice area to form a shielding stroke, and the triggering structure moves from the position of starting to act on the accumulator valve plate to the position of opening the accumulator valve plate to form a valve opening stroke. The shielding stroke is completed before the valve opening stroke. The accumulator valve plate can rotate around the valve plate pivot, and a valve plate limiting block is provided on the opening deflection path of the accumulator valve plate to limit its opening angle.

[0011] Furthermore, the outer sleeve of the compressed airbag is equipped with a limit plate return spring, one end of which is located on one side of the placement cavity and the other end is located on one side of the limit plate; the two ends of the compressed airbag are respectively equipped with a one-way air inlet valve and a one-way air outlet valve, the one-way air outlet valve is connected to the annular air passage through the air outlet cylinder, and the air inlet side of the one-way air inlet valve is equipped with a filter element.

[0012] Furthermore, the limiting plate is provided with a guide limiting block, and the inner wall of the placement cavity is provided with a guide groove corresponding to the guide limiting block. The guide limiting block and the guide groove cooperate to restrict the axial movement of the limiting plate and the annular air passage along the placement cavity. The air outlet side of the annular air passage is provided with an inclined spray plate that is inclined towards the collection groove. The inclined spray plate and the inner wall of the placement cavity form a dust sweeping outlet facing the collection groove. The effective compression volume of the compressed air bag is V, the total flow area of ​​the dust sweeping outlet is A, the effective trigger stroke of the limiting plate is L, and V / (A×L) is 5 to 25.

[0013] Furthermore, the dust scraper lip is an annular elastic edge, and the inner diameter of the dust scraper lip is larger than the outer diameter of the front insulating shell of the charging gun. The inner wall of the dust scraper lip is provided with a brush, and the inner diameter formed by the free ends of the brush is smaller than the outer diameter of the front insulating shell of the charging gun by 0.5mm to 3mm. One end of the dust scraper lip is provided with a fixing groove, and the edge of the shield cap is provided with a fixing buckle. The fixing buckle and the fixing groove form a detachable positioning fit to limit the initial position of the shield cap after the charging gun is pulled out. The outer side of the dust scraper lip is also provided with a dust cover for shielding the entrance of the placement cavity.

[0014] Furthermore, the dust collection chamber is equipped with a pull-out dust collection box, and the inner wall of the pull-out dust collection box is equipped with an inclined plate that bends and extends to the bottom, and the inclined plate is located below the collection trough; a check dust baffle is provided between the collection trough and the dust collection chamber. The check dust baffle opens when the sweeping airflow enters the dust collection chamber and resets to block the lower opening of the collection trough after the airflow stops; a reverse suction one-way valve is provided on one side of the collection trough. The reverse suction one-way valve is connected to the rebound air intake side of the compressed air bag through the reverse suction channel, and is used to form a negative pressure suction airflow above the collection trough when the compressed air bag rebounds.

[0015] The beneficial effects of this invention are as follows: This application provides a charging pile for mining electric vehicles. By using the retraction action of the charging gun to drive the compressed air bag to exhaust air, and forming a downward dust-sweeping airflow through the annular air passage and the inclined spray plate, the gun base can clean the dust around the gun nozzle while storing the charging gun, without the need for an external air source or manual wiping.

[0016] This application provides a charging pile for mining electric vehicles. Existing direct blowing structures easily blow dust into the terminal holes. This invention provides a shielding cap on the inner side of the dust scraper lip. The shielding cap first blocks the terminal hole area of ​​the charging gun, and then the dust sweeping airflow is guided downward and discharged along the area between the outer periphery of the gun hole and the inner wall of the placement cavity, thereby reducing the risk of dust being blown into the terminal holes.

[0017] This application provides a charging pile for mining electric vehicles. By limiting the relationship between the effective compression volume of the compressed airbag, the total flow area of ​​the dust sweeping outlet, and the trigger stroke of the limiting plate, and limiting the angle range of the inclined spray plate, it can control the charging gun re-insertion resistance while ensuring the strength of the dust sweeping airflow, and reduce the problems of dust sweeping failure due to weak airflow or re-insertion difficulty due to excessive air resistance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort: Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the placement cavity of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the dust scraper lip and brush of the present invention; Figure 4 This is a schematic diagram of a partial cross-sectional three-dimensional structure of the placement cavity of the present invention; Figure 5 This is a three-dimensional structural diagram of the compression airbag and limiting disc of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A Figure 7 This is a partial cross-sectional three-dimensional structural diagram of the placement cavity and filter element of the present invention; Figure 8 This is a schematic diagram of the moving structure of the compressed airbag of the present invention; Figure 9 This is a partial cross-sectional three-dimensional structural diagram of the dust collection bin and pull-out dust collection box of the present invention; Figure 10 This is a three-dimensional structural diagram of the dust cover and shielding cap of the present invention.

[0019] In the diagram: 1. Charging pile body; 2. Charging cable; 3. Charging gun; 4. Gun base; 5. Placement chamber; 6. Dust blowing assembly; 7. Compressed airbag; 8. Limiting plate; 9. Limiting plate return spring; 10. Guide limiting block; 11. Filter element; 12. One-way air inlet valve; 13. One-way air outlet valve; 14. Air outlet cylinder; 15. Annular air passage; 16. Contact block; 17. Slanted spray plate; 18. Guide groove; 19. Collection groove; 20. Dust collection bin; 21. 1. Pull-out dust collection box; 22. Handle; 23. Inclined plate; 24. Dust scraper lip; 25. Brush; 26. Dust cover pivot; 27. Dust cover; 28. Shielding cap; 29. ​​Fixing buckle; 30. Fixing groove; 31. Valve plate pivot; 32. Accumulation valve plate; 33. Valve plate limit block; 34. Trigger plate; 35. Connecting plate; 36. Guide rod; 37. Shielding cap return spring; 38. Check dust plate; 39. Back suction one-way valve; 40. Trigger rod. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1, as Figures 1 to 10 As shown, this embodiment provides a charging pile for mining electric vehicles, including a charging pile body 1, a charging cable 2, a charging gun 3, and a gun holder 4. The charging pile body 1 can be a vertical DC charging pile. One end of the charging cable 2 is connected to the output end inside the charging pile body 1, and the other end of the charging cable 2 is connected to the charging gun 3. The charging gun 3 is used to plug into the charging interface of the mining electric vehicle or electric mining truck. The gun holder 4 is located on the side of the charging pile body 1 and is used to accommodate the front end of the charging gun 3 when the charging gun 3 is not working.

[0022] like Figures 2 to 8 As shown, a placement cavity 5 is formed inside the gun holder 4 for inserting the front end of the charging gun 3. The placement cavity 5 is a cylindrical cavity extending along the insertion direction of the charging gun 3. The inlet end of the placement cavity 5 faces the outside of the gun holder 4. The rear section of the placement cavity 5 is used to install the compressed air bag 7 and the limiting plate 8. A collection groove 19 is provided at the bottom of the placement cavity 5. The collection groove 19 is connected to the dust collection chamber 20 below. The inner wall of the placement cavity 5 can be made of wear-resistant plastic lining to adapt to the repeated insertion and removal friction requirements of the charging gun 3 in the dusty environment of the mine.

[0023] like Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, a dust blowing assembly 6 is installed inside the placement cavity 5. The dust blowing assembly 6 includes a compressed air bag 7, a limiting plate 8, a limiting plate return spring 9, a guide limiting block 10, a filter element 11, a one-way air inlet valve 12, a one-way air outlet valve 13, an air outlet cylinder 14, an annular air passage 15, a contact block 16, an inclined spray plate 17, and a guide groove 18. The compressed air bag 7 is located at the rear of the placement cavity 5. The compressed air bag 7 can be a corrugated elastic air bag, and its material can be nitrile rubber, silicone rubber, or other flexible materials with wear resistance, aging resistance, and certain resilience. The limiting plate 8 is connected to the front end of the compressed air bag 7. An air outlet cylinder 14 is provided on one side of the limiting plate 8, and an annular air passage 15 is provided at one end of the air outlet cylinder 14. The limiting plate 8 is used to withstand the thrust when the charging gun 3 is inserted back and to transmit the thrust to the compressed air bag 7, so that the compressed air bag 7 is effectively compressed. From a functional perspective, the dust blowing assembly 6 is used to perform continuous actions during the re-insertion of the charging gun 3 into the placement chamber 5, including re-insertion compressed air supply, terminal orifice blocking, delayed release of accumulated pressure, and peripheral downward dust collection. Specifically, when the charging gun 3 is re-inserted, it can push the dust blowing assembly 6 to compress the compressed air bag 7. The blocking cap 28 can block the terminal orifice area of ​​the charging gun 3 before the dust-sweeping airflow is released. The accumulating pressure valve plate 32 can block or restrict the gas from entering the annular ventilation channel 15 before the blocking cap 28 completes its blocking action, and opens after the blocking cap 28 blocks the terminal orifice area, allowing the accumulated airflow to be guided downward along the periphery of the charging gun 3's nozzle to the collection tank 19 and the dust collection chamber 20 via the annular ventilation channel 15.

[0024] like Figure 5 and Figure 7 As shown, multiple sets of guide limiting blocks 10 are provided on the limiting plate 8, and guide grooves 18 are correspondingly provided on the inner wall of the placement cavity 5. The guide limiting blocks 10 are slidably disposed in the guide grooves 18, and the guide limiting blocks 10 and the guide grooves 18 correspond one-to-one, so that the limiting plate 8 can only move along the axial direction of the placement cavity 5 and cannot rotate significantly circumferentially relative to the placement cavity 5. This structure can ensure that the air outlet 14, the annular air passage 15, the contact block 16 and the inclined spray plate 17, which move synchronously with the limiting plate 8, still maintain a stable circumferential orientation after repeated actions, and prevent the dust sweeping outlet of the annular air passage 15 from deviating from the collection groove 19.

[0025] like Figure 4 , Figure 5 and Figure 8 As shown, a limiting disc return spring 9 is installed outside the compressed airbag 7. One end of the limiting disc return spring 9 is located on one side of the placement cavity 5, and the other end is located on one side of the limiting disc 8. When the charging gun 3 is inserted into the placement cavity 5 and pushes the contact block 16, the annular ventilation channel 15 and the limiting disc 8 move backward, and the limiting disc 8 compresses the compressed airbag 7. At the same time, the limiting disc return spring 9 is compressed. When the charging gun 3 is pulled out of the placement cavity 5, the limiting disc return spring 9 pushes the limiting disc 8, the annular ventilation channel 15 and the contact block 16 to reset, and the compressed airbag 7 rebounds and replenishes air.

[0026] like Figure 5 , Figure 7 and Figure 8As shown, the two ends of the compression airbag 7 are respectively provided with a one-way inlet valve 12 and a one-way outlet valve 13. The one-way inlet valve 12 is connected to the outside, and the one-way outlet valve 13 is connected to the annular ventilation channel 15 through the outlet cylinder 14. A filter element 11 is provided on the inlet side of the one-way inlet valve 12. When the compression airbag 7 rebounds, the one-way inlet valve 12 opens, and the outside air is filtered through the filter element 11 and enters the compression airbag 7. The one-way outlet valve 13 closes. When the compression airbag 7 is compressed by the limiting plate 8, the one-way inlet valve 12 closes, the one-way outlet valve 13 opens, and the gas in the compression airbag 7 enters the inlet side of the annular ventilation channel 15 through the outlet cylinder 14. The filter element 11 can adopt a combination structure of filter cotton, microporous filter element or desiccant and filter screen to reduce the dust and moisture entering the compression airbag 7.

[0027] like Figure 4 , Figure 5 and Figure 6 As shown, the edge of the annular vent 15 is provided with a contact block 16. The contact block 16 is located on the insertion path of the charging gun 3. The contact block 16 can be set as a flexible contact block or a hard contact block with a rounded transition surface. The side facing the charging gun 3 is preferably a rounded surface or a slope to reduce the impact and jamming during the initial insertion of the charging gun 3. After the charging gun 3 is inserted into the placement cavity 5 and reaches the predetermined position, the front end of the charging gun 3 or the shielding cap 28 that moves with the charging gun 3 pushes the contact block 16. The contact block 16 drives the annular vent 15, the air outlet 14 and the limiting plate 8 to move backward synchronously, thereby compressing the compression airbag 7.

[0028] like Figure 5 and Figure 6 As shown, a pressure accumulator outlet is formed on the air inlet side of the annular vent 15. A pressure accumulator valve 32 is installed at the pressure accumulator outlet, and the pressure accumulator valve 32 can rotate around the valve shaft 31. The pressure accumulator valve 32 acts as an openable blocking element between the compressed air bag 7 and the annular vent 15. When the structure is not triggered, it blocks the pressure accumulator outlet, so that the gas generated by the compression of the compressed air bag 7 is temporarily stored upstream of the pressure accumulator valve 32, so as to avoid the formation of a strong dust sweeping airflow in advance before the area of ​​the terminal hole is not blocked by the blocking cap 28. After the structure is triggered, the pressure accumulator valve 32 releases the blockage of the pressure accumulator outlet, allowing the pressure accumulator airflow to enter the annular vent 15. A valve plate limiting block 33 is provided on the opening deflection path of the accumulator valve plate 32. When the trigger plate 34 pushes open the accumulator valve plate 32, the valve plate limiting block 33 is used to limit the maximum opening angle of the accumulator valve plate 32 to prevent the accumulator valve plate 32 from deflecting excessively and failing to reset in time, or causing turbulent backflow of airflow at the accumulator outlet.

[0029] like Figure 3 , Figure 6 and Figure 10As shown, a dust scraper lip 24 is provided at the entrance of the placement cavity 5. The dust scraper lip 24 is an annular elastic edge. The inner diameter of the dust scraper lip 24 is larger than the outer diameter of the front insulating shell of the charging gun 3, so that the dust scraper lip 24 does not form a significant rigid obstruction to the charging gun 3. A brush 25 is provided on the inner wall of the dust scraper lip 24. The brush 25 can be made of nylon filaments, polypropylene filaments, wear-resistant elastic filaments, or anti-static filaments. The inner diameter formed by the free end of the brush 25 is 0.5mm to 3mm smaller than the outer diameter of the front insulating shell of the charging gun 3, so that the brush 25 can contact the front insulating shell of the charging gun 3 and scrape off the peripheral dust. When the inner diameter difference is less than 0.5mm, the contact pressure of the brush 25 is small, and the scraping effect on the adhering mineral powder is insufficient. When the inner diameter difference is greater than 3mm, the compression of the brush 25 increases, the insertion resistance of the charging gun 3 increases, and the wear of the brush 25 may be accelerated. Therefore, an appropriate inner diameter difference can be selected according to the front outer diameter of the charging gun 3, the hardness of the brush 25 filaments, and the degree of dust adhesion in the mining area.

[0030] like Figure 6 and Figure 10 As shown, a shielding cap 28 is provided on the inner side of the dust scraper lip 24. The shielding cap 28 is used to shield the terminal hole area of ​​the charging gun 3. A set of connecting plates 35 is provided on the shielding cap 28. A guide rod 36 is provided at one end of the connecting plate 35. The guide rod 36 is slidably disposed on the dust scraper lip 24. A shielding cap return spring 37 is sleeved on the guide rod 36. The shielding cap return spring 37 is used to drive the shielding cap 28 to return to the avoidance position after the charging gun 3 is pulled out. The front end face of the shielding cap 28 contacts or approaches the outer periphery of the end face where the terminal hole of the charging gun 3 is located, and the shielding cap 28 does not extend into the terminal hole of the charging gun 3. The shielding cap 28 can be made of insulating elastic material or a rigid support member with an insulating elastic layer on the surface to avoid damage to the terminal hole and its surrounding insulation structure. In this embodiment, the shielding cap 28 is a terminal hole shielding structure. Its shielding effect is not achieved by inserting it into the terminal hole, but rather by the front end face of the shielding cap 28 contacting or approaching the outer periphery of the end face where the terminal hole of the charging gun 3 is located. A non-insertion gap is maintained between the front end face of the shielding cap 28 and the end face where the terminal hole of the charging gun 3 is located, and the projection of the shielding cap 28 on the end face of the charging gun 3 covers the terminal hole area or the outer periphery of the terminal hole area. This prevents the airflow from directly entering the terminal hole when the dust-sweeping airflow is released, ensuring that the terminal hole area is shielded before the dust-sweeping airflow is released. Therefore, when the subsequently pressurized airflow is released, the airflow mainly flows along the periphery of the charging gun 3 nozzle, rather than directly rushing into the terminal hole.

[0031] like Figure 6As shown, the triggering structure in this embodiment is used to convert the blocking action of the blocking cap 28 into the opening action of the accumulator valve 32. Before the blocking cap 28 moves to the position of blocking the terminal orifice area of ​​the charging gun 3, the triggering structure does not open the accumulator valve 32; after the blocking cap 28 moves to the position of blocking the terminal orifice area, the triggering structure acts on the accumulator valve 32 to open the accumulator valve 32.

[0032] In one specific embodiment, the triggering structure includes a trigger rod 40 disposed on one side of the shielding cap 28 and a trigger plate 34 for opening the accumulator valve 32. The trigger plate 34 is disposed on the angled spray plate 17, and the trigger rod 40 is in contact with one side of the angled spray plate 17. The angled spray plate 17 forms a deformable elastic triggering part at least at the position in contact with the trigger rod 40. When the shielding cap 28 blocks the terminal orifice area, the trigger rod 40 presses against the elastic triggering part of the angled spray plate 17, causing the angled spray plate 17 to drive the trigger plate 34 to deflect toward the accumulator valve 32, thereby opening the accumulator valve 32. Specifically, the elastic triggering part of the angled spray plate 17 can be formed by a metal spring, an elastic plastic sheet, or a thin sheet structure with elastic recovery capability. When the trigger rod 40 presses against the elastic triggering part, the angled spray plate 17 undergoes elastic bending deformation. When the trigger rod 40 releases the pressure, the angled spray plate 17 resets under its own elastic recovery force.

[0033] The shielding cap 28 moves from its initial position to the position that shields the terminal orifice area of ​​the charging gun 3, forming a shielding stroke. The triggering structure moves from the initial action on the accumulator valve 32 to the position where the accumulator valve 32 is opened, forming a valve opening stroke. The shielding stroke is completed before the valve opening stroke. If the shielding stroke is too short, the shielding cap 28 will not fully shield the terminal orifice area before triggering dust blowing, and there is still a risk that dust will enter the terminal orifice. If the shielding stroke is too long, the total resistance of the charging gun 3 when it is reinserted will increase. If the valve opening stroke is too short, the opening angle of the accumulator valve 32 will be insufficient, and the amount of accumulator airflow released will be insufficient. If the valve opening stroke is too long, the accumulator valve 32 will deflect excessively, which may cause the accumulator valve 32 to stick, not reset in time, or cause the airflow at the accumulator outlet to backflush.

[0034] like Figure 4 , Figure 5 , Figure 6 and Figure 8As shown, the annular vent 15 forms a circumferential air guiding area around the periphery of the charging gun 3 nozzle. A dust removal outlet is formed on the outlet side of the annular vent 15, facing the area between the periphery of the charging gun 3 nozzle and the inner wall of the placement cavity 5. This allows the pressurized airflow to bypass the terminal orifice area and be guided downwards along the periphery of the nozzle towards the collection tank 19. An inclined spray plate 17 is provided on the outlet side of the annular vent 15, tilting towards the collection tank 19. A dust removal outlet is formed between the inclined spray plate 17 and the inner wall of the placement cavity 5, facing the collection tank 19. The inclined spray plate 17 is used to change the direction of airflow from the annular vent 15. The airflow discharged from the annular vent 15 avoids the terminal hole area of ​​the charging gun 3, and is guided downward along the outer periphery of the nozzle and the inner wall of the placement cavity 5, eventually entering the collection tank 19. The guiding surface of the inclined spray plate 17 is preferably at an angle of 25° to 55° relative to the insertion direction of the charging gun 3. When the angle is less than 25°, the airflow is closer to axial straight-through, which easily causes dust to rise back towards the nozzle. When the angle is greater than 55°, the rebound of the airflow after impacting the inner wall of the placement cavity 5 is enhanced, and the dust is difficult to enter the collection tank 19 stably. Therefore, the above angle range can take into account both the peripheral dust sweeping and the downward dust collection effect.

[0035] like Figure 2 and Figure 10 As shown, a dust cover pivot 26 is provided on the outside of the dust scraper lip 24, and a dust cover 27 is provided on the dust cover pivot 26. The dust cover 27 is formed by two overlapping elastic door pieces. When the charging gun 3 is inserted into the placement cavity 5, the front end of the charging gun 3 pushes open the dust cover 27 and enters the dust scraper lip 24. After the charging gun 3 is pulled out, the dust cover 27 is reset under its own elasticity or the reset force at the dust cover pivot 26, blocking the entrance of the placement cavity 5. The dust cover 27 and the dust scraper lip 24 cooperate to form a two-stage structure of entrance dust prevention and entrance dust scraping. The former reduces the entry of external dust into the placement cavity 5 when the charging gun 3 is not inserted, and the latter scrapes off the dust that has been attached to the outer periphery of the front end of the charging gun 3 when the charging gun 3 is inserted.

[0036] like Figure 8 and Figure 9 As shown, a collection trough 19 is provided at the bottom of the placement cavity 5, and the collection trough 19 is connected to the dust collection chamber 20. A pull-out dust collection box 21 is provided inside the dust collection chamber 20. A handle 22 is provided on one side of the pull-out dust collection box 21. An inclined plate 23 extending downwards is provided on the inner wall of the pull-out dust collection box 21. The inclined plate 23 is located below the collection trough 19. When the dust sweeping airflow carries dust into the collection trough 19, the dust enters the dust collection chamber 20 under the action of gravity and residual airflow pressure, and is guided along the inclined plate 23 to the lower part of the pull-out dust collection box 21. Maintenance personnel can pull out the pull-out dust collection box 21 through the handle 22 to clean the accumulated mineral powder inside.

[0037] like Figure 9 and Figure 10As shown, a backflow preventer 38 is provided between the collection trough 19 and the dust collection chamber 20. The backflow preventer 38 can be a flexible sheet or a hinged sheet. Its upper end is connected to the side wall of the collection trough 19, and its lower end is inclined towards the dust collection chamber 20. When the sweeping airflow enters the dust collection chamber 20, it pushes the backflow preventer 38 to open. After the airflow stops, the backflow preventer 38 returns to its original position due to its own elasticity and blocks the lower opening of the collection trough 19, so that the dust in the dust collection chamber 20 or the pull-out dust collection box 21 is not easily returned due to the next insertion and removal disturbance or the backflow of airflow. Return to cavity 5; a fixing groove 30 is provided at one end of the dust scraper lip 24, and multiple sets of fixing buckles 29 are provided on the edge of the shield cap 28. The positions of the fixing buckles 29 correspond to the fixing groove 30. When the charging gun 3 is pulled out, the fixing buckles 29 contact the fixing groove 30. The fixing buckles 29 and the fixing groove 30 can be magnetically connected or snap-fit ​​connected. Through cooperation with the guide rod 36, the shield cap 28 is fixed on one side of the dust scraper lip 24, so that it can be accurately fitted with the shield cap 28 when the charging gun 3 is inserted next time.

[0038] like Figure 9 As shown, a reverse suction check valve 39 is provided on one side of the collection tank 19. A reverse suction channel is formed in the side wall of the gun base 4 or the dust collection chamber 20. One end of the reverse suction channel is located above the collection tank 19 or on the side of the collection tank 19 near the dust collection chamber 20, and the other end is connected to the rebound air intake side of the compressed air bag 7. The reverse suction check valve 39 is located in the reverse suction channel or at the end of the reverse suction channel near the collection tank 19. After the charging gun 3 is pulled out, the limit plate reset spring 9 pushes the limit plate 8 to reset, the compressed air bag 7 rebounds and forms a brief negative pressure above the collection tank 19 through the reverse suction check valve 39, causing the residual suspended dust above the collection tank 19 to gather in the area where the collection tank 19 is located. The air intake side of the reverse suction check valve 39 is equipped with a filter structure or a dust-blocking structure to prevent dust from entering the compression chamber 7 with the reverse suction airflow. The reverse suction check valve 39 only allows the air above the collection tank 19 to flow through the reverse suction channel to the rebound air intake side of the compression chamber 7, and prevents the airflow from entering the collection tank 19 or the dust collection chamber 20 in the reverse suction channel when the compression chamber 7 is compressed and discharged.

[0039] like Figure 4 , Figure 5 and Figure 8As shown, the effective compression volume of the airbag 7 is V, the total flow area of ​​the dust-sweeping outlet formed on the air outlet side of the annular ventilator 15 is A, and the effective trigger stroke of the limiting plate 8 is L. Preferably, V / (A×L) is 5 to 25. The effective compression volume V is determined by the volume of air discharged by the airbag 7 during one insertion of the charging gun 3. The total flow area A is determined by the sum of the areas of each dust-sweeping outlet on the air outlet side of the annular ventilator 15. The effective trigger stroke L is the stroke from when the contact block 16 begins to be stressed until the limiting plate 8 stops moving. When V / (A×L) is less than 5, the air velocity after passing through the dust removal outlet per unit stroke is too low, resulting in insufficient ability to strip and carry dust around the nozzle. When V / (A×L) is greater than 25, the airflow throttling is too strong or the compression resistance is too large, making it easy for operators to feel obstruction when re-inserting the charging gun 3, and potentially accelerating the fatigue of the compression airbag 7. Therefore, different mine dust concentrations and different specifications of charging guns 3 can be adapted by changing the volume of the compression airbag 7, adjusting the outlet area of ​​the annular ventilation channel 15, or limiting the stroke of the limiting plate 8.

[0040] The working process of this embodiment is as follows: After charging is completed, the operator inserts the charging gun 3 back into the placement cavity 5 of the gun holder 4. The front end of the charging gun 3 first pushes open the dust cover 27 and enters the dust scraping lip 24. The brush 25 contacts the insulating shell of the front end of the charging gun 3 and scrapes off the dust adhering to the outer periphery. A portion of the scraped dust falls into the bottom of the placement cavity 5 under the action of gravity. After the charging gun 3 is further inserted, the shield cap 28 is located on the re-insertion path of the front end face of the charging gun 3. When the front end of the charging gun 3 is inserted, the shield cap 28 is pushed first to make the shield... The cap 28 moves along the direction defined by the guide rod 36 and covers the terminal hole area, and blocks the terminal hole area of ​​the charging gun 3; then the charging gun 3 pushes the contact block 16, and the contact block 16 drives the annular vent 15 and the limiting plate 8 to move backward along the guide groove 18. The limiting plate 8 compresses the compression bag 7. At this time, the accumulator valve plate 32 still blocks the accumulator outlet on the air inlet side of the annular vent 15, so that the gas in the compression bag 7 is first accumulating pressure; when the cap 28 is in place, the triggering structure begins to act on the accumulator valve plate 32. Specifically, the trigger rod 40 contacts one side of the angled spray plate 17, causing the angled spray plate 17 to deflect closer to the compressed air bag 7, and driving the trigger plate 34 to open the accumulator valve plate 32; the accumulator valve plate 32 rotates until it abuts against the valve plate limit block 33 and then stops deflecting. The accumulator airflow forms a downward dust-sweeping airflow along the periphery of the nozzle through the annular ventilation channel 15 and the angled spray plate 17. The airflow carries the dust from the periphery of the nozzle into the collection tank 19 and the dust collection chamber 20, and finally the dust falls into the pull-out dust collection box 2. 1; When the charging gun 3 is removed again, the limit plate reset spring 9 pushes the limit plate 8 and the annular vent 15 to reset, the compressed air bag 7 rebounds and forms a brief negative pressure above the collection tank 19 through the reverse suction one-way valve 39, causing the residual suspended dust above the collection tank 19 to gather in the area where the collection tank 19 is located; after the airflow stops, the check dust baffle 38 resets to block the lower opening of the collection tank 19, and the dust cover 27 resets to block the entrance of the placement cavity 5, preparing for the next insertion and dust cleaning cycle.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A charging pile for a mining electric vehicle, comprising a charging pile body (1), a charging gun (3) connected to the charging pile body (1) via a charging cable (2), and a gun holder (4) disposed on the side of the charging pile body (1), wherein a placement cavity (5) for inserting the front end of the charging gun (3) is formed in the gun holder (4), characterized in that: The placement cavity (5) is provided with a dust blowing assembly (6), and a dust scraper lip (24) is provided at the entrance of the placement cavity (5). A shielding cap (28) is provided on the inner side of the dust scraper lip (24) that can move to block the terminal hole area of ​​the charging gun (3) as the charging gun (3) is re-inserted. The dust blowing assembly (6) includes a compressed air bag (7) compressed by the push of the charging gun (3) and an annular air passage (15) connected to the compressed air bag (7) and used to guide air to the periphery of the nozzle of the charging gun (3). The air outlet side of the annular air passage (15) forms a dust blowing outlet that guides the airflow downward toward the collection tank (19). The air inlet side of the annular air passage (15) is provided with a pressure accumulator valve plate (32). When the accumulator valve (32) is not open, it blocks the exhaust path of the compressed air bag (7) to the annular ventilation channel (15), so that the gas discharged from the compressed air bag (7) is pressurized upstream of the accumulator valve (32); the dust blowing assembly (6) is also provided with a triggering structure that cooperates with the action of the shielding cap (28). The triggering structure opens the accumulator valve (32) after the shielding cap (28) shields the terminal hole area, so that the pressurized airflow is guided down through the annular ventilation channel (15) along the periphery of the charging gun (3) to the collection tank (19) located at the bottom of the placement chamber (5) and the dust collection chamber (20) connected to the collection tank (19).

2. The charging pile for a mining electric vehicle according to claim 1, characterized in that, The dust blowing assembly (6) also includes a limiting plate (8) connected to the front end of the compressed air bag (7) and an air outlet (14) set on one side of the limiting plate (8). An annular air passage (15) is set at the end of the air outlet (14) away from the limiting plate (8). The edge of the annular air passage (15) is provided with a contact block (16) located on the re-insertion path of the charging gun (3). When the charging gun (3) is re-inserted, the contact block (16) drives the annular air passage (15), the air outlet (14) and the limiting plate (8) to move backward synchronously to compress the compressed air bag (7).

3. A charging pile for mining electric vehicles according to claim 1, characterized in that, The shield cap (28) is connected to the guide rod (36) via the connecting plate (35). The guide rod (36) is slidably mounted on the dust scraper lip (24) or the gun seat (4). A shield cap reset spring (37) is sleeved on the guide rod (36). The shield cap reset spring (37) is used to drive the shield cap (28) to reset after the charging gun (3) is pulled out. The front end face of the shield cap (28) is in contact with or close to the outer periphery of the end face where the terminal hole of the charging gun (3) is located, and the shield cap (28) does not extend into the terminal hole of the charging gun (3).

4. A charging pile for a mining electric vehicle according to claim 1, characterized in that, The triggering structure includes a trigger rod (40) disposed on one side of the shield cap (28) and a trigger plate (34) for opening the accumulator valve plate (32). After the shield cap (28) blocks the terminal hole area, the trigger rod (40) drives the trigger plate (34) to open the accumulator valve plate (32).

5. A charging pile for mining electric vehicles according to claim 4, characterized in that, The outlet side of the annular vent (15) is provided with an inclined spray plate (17) that is inclined toward the collection tank (19). A trigger plate (34) is provided on the inclined spray plate (17). The trigger rod (40) is in contact with one side of the inclined spray plate (17). The inclined spray plate (17) is a deformable structure at least at the position in contact with the trigger rod (40) so that when the trigger rod (40) presses against it, it drives the trigger plate (34) to deflect toward the accumulator valve plate (32).

6. A charging pile for mining electric vehicles according to claim 1, characterized in that, The shielding cap (28) moves from its initial position to the position of shielding the terminal hole area of ​​the charging gun (3) to form a shielding stroke. The triggering structure moves from the position of starting to act on the accumulator valve plate (32) to the position of opening the accumulator valve plate (32) to form a valve opening stroke. The shielding stroke is completed before the valve opening stroke. The accumulator valve plate (32) can rotate around the valve plate pivot (31). The opening deflection path of the accumulator valve plate (32) is provided with a valve plate limiting block (33) for limiting its opening angle.

7. A charging pile for mining electric vehicles according to claim 2, characterized in that, The compressed air bag (7) is covered with a limit plate return spring (9). One end of the limit plate return spring (9) is located on one side of the placement cavity (5), and the other end is located on one side of the limit plate (8). The compressed air bag (7) is provided with a one-way air inlet valve (12) and a one-way air outlet valve (13) at both ends. The one-way air outlet valve (13) is connected to the annular air passage (15) through the air outlet cylinder (14). The air inlet side of the one-way air inlet valve (12) is provided with a filter element (11).

8. A charging pile for a mining electric vehicle according to claim 2, characterized in that, The limiting plate (8) is provided with a guide limiting block (10), and the inner wall of the placement cavity (5) is provided with a guide groove (18) corresponding to the guide limiting block (10). The guide limiting block (10) and the guide groove (18) cooperate to restrict the movement of the limiting plate (8) and the annular ventilation channel (15) along the axial direction of the placement cavity (5). The outlet side of the annular ventilation channel (15) is provided with an inclined spray plate (17) that is inclined towards the collection tank (19). The inclined spray plate (17) and the inner wall of the placement cavity (5) form a dust removal outlet facing the collection tank (19). The effective compression volume of the compressed air bag (7) is V, the total flow area of ​​the dust removal outlet is A, the effective trigger stroke of the limiting plate (8) is L, and V / (A×L) is 5 to 25.

9. A charging pile for a mining electric vehicle according to claim 1, characterized in that, The dust scraper lip (24) is an annular elastic edge. The inner diameter of the dust scraper lip (24) is larger than the outer diameter of the front insulating shell of the charging gun (3). The inner wall of the dust scraper lip (24) is provided with a brush (25). The inner diameter formed by the free end of the brush (25) is smaller than the outer diameter of the front insulating shell of the charging gun (3) by 0.5mm to 3mm. One end of the dust scraper lip (24) is provided with a fixing groove (30). The edge of the shield cap (28) is provided with a fixing buckle (29). The fixing buckle (29) and the fixing groove (30) form a detachable positioning fit to limit the initial position of the shield cap (28) after the charging gun (3) is pulled out. The outer side of the dust scraper lip (24) is also provided with a dust cover (27) for shielding the entrance of the placement cavity (5).

10. A charging pile for a mining electric vehicle according to claim 1, characterized in that, The dust collection chamber (20) is equipped with a pull-out dust collection box (21). The inner wall of the pull-out dust collection box (21) is equipped with an inclined plate (23) that bends and extends to the bottom. The inclined plate (23) is located below the collection trough (19). A check dust baffle (38) is provided between the collection trough (19) and the dust collection chamber (20). The check dust baffle (38) opens when the dust sweeping airflow enters the dust collection chamber (20) and resets to block the lower opening of the collection trough (19) after the airflow stops. A reverse suction one-way valve (39) is provided on one side of the collection trough (19). The reverse suction one-way valve (39) is connected to the rebound air intake side of the compressed air bag (7) through the reverse suction channel. It is used to form a negative pressure dust suction airflow above the collection trough (19) when the compressed air bag (7) rebounds.

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