An electric drive system for a mining scraper conveyor

Abstract

The present invention discloses an electric drive system for a mining scraper conveyor, comprising a motor and a controller. The motor comprises a housing, a stator assembly, a rotor assembly, and a rotating shaft. The stator assembly is fixed to the housing, the rotor assembly is fixed to the rotating shaft, the rotating shaft is axially rotatably mounted on the housing, and the rotor assembly is disposed within the stator assembly. The stator assembly comprises a stator core and a stator winding. The stator winding comprises a plurality of coils, each of which has two lead ends. A plurality of clamps for clamping the lead ends are provided on the drive circuit board. The rotor assembly comprises a rotor core, a right end plate, a left end plate, a coolant guide ring, and a coolant nozzle. By connecting the lead ends of the stator winding to a cooling chamber, the present invention can better cool the stator winding, ensuring that both the motor and the controller of the electric drive system for the mining scraper conveyor can obtain reliable heat dissipation. At the same time, the present invention does not require the provision of a dynamic sealing structure, thereby improving the reliability of the rotor cooling structure.

Description

Technical Field

[0001] The invention belongs to the technical field of electric drive systems and relates to an electric drive system for a mining scraper conveyor. Background Art

[0002] As the power of coal mining machines continues to increase, the power of scraper conveyors used in coal mining machine systems is also gradually increasing. Correspondingly, the power of the electric drive system for scraper conveyors is also gradually increasing. The electric drive system for scraper conveyors is composed of an integrated drive motor and a controller. Due to the increase in power, higher requirements are also placed on the heat dissipation of the electric drive system, requiring the electric drive system to ensure reliable heat dissipation of the drive motor and controller during continuous operation.

[0003] The existing electric drive system heat dissipation method is to set a cooling water channel on the casing and install a cooling fan on the shaft. However, this cooling method cannot effectively cool the drive motor and controller, causing the electric drive system to overheat easily after long-term operation, and even burn out the electric drive system. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide an electric drive system for a mining scraper conveyor.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: an electric drive system for a mining scraper conveyor, comprising a motor and a controller, the motor comprising a casing, a stator assembly, a rotor assembly, and a rotating shaft, the stator assembly being fixed to the casing, the rotor assembly being fixed to the rotating shaft, the rotating shaft being rotatably mounted on the casing along the axial direction, the rotor assembly being placed in the stator assembly, the stator assembly comprising a stator core and a stator winding, the stator winding comprising a plurality of coils, each of the coils having two lead ends, the controller comprising a heat sink and a driving circuit board, the heat sink being fixed to the right end of the casing, and a cooling chamber being formed between the heat sink and the casing, the driving circuit board being fixed to the right end of the heat sink, the lead ends of all the coils respectively passing through the casing, the cooling chamber, the heat sink and the driving circuit board in sequence, and a plurality of clamps for clamping the lead ends are provided on the driving circuit board;

[0006] The rotor assembly includes a rotor core, a right end plate, a left end plate, a coolant guide ring and a coolant nozzle. The left end plate and the right end plate are respectively fixed on both sides of the rotor core. The coolant guide ring is fixed on the left end plate. The coolant nozzle extends into the casing from the left end cover of the casing. The coolant nozzle sprays coolant into the coolant guide ring. The coolant enters the cooling chamber through the rotor assembly and the rotating shaft.

[0007] Furthermore, an axial cooling channel is axially provided on the rotor core, a coolant inlet hole is provided at a position corresponding to the axial cooling channel on the left end plate, and a radial cooling channel is radially provided on the right end plate, the top end of the radial cooling channel is connected with the axial cooling channel, the rotating shaft axially passes through the left end plate, the rotor core and the right end plate in sequence, and the rotating shaft includes a solid body section and a hollow body section, the left end of the hollow body section is connected with the bottom end of the radial cooling channel, and a one-way valve is installed on the right end, and mounting holes for the rotating shaft to pass through are respectively provided on the left end cover and the right end cover of the casing, and the two ends of the rotating shaft are connected to the mounting holes through bearings.

[0008] Furthermore, the coolant guide ring includes an annular body, the left end surface of the annular body extends inward to form a first annular boss, the right end surface of the annular body is fixed to the left end plate, and a spacing area is formed between the coolant guide ring and the left end plate. The nozzle of the coolant nozzle extends into the spacing area and sprays coolant into the spacing area. The coolant flows from the coolant inlet hole to the axial cooling channel, the radial cooling channel and the hollow body section of the rotating shaft in sequence, and then enters the cooling chamber through the one-way valve.

[0009] 14. The heat dissipation device of claim 13 wherein the arcuate depression has a side wall that is located adjacent to the top of the heat dissipation device and the side wall that is located adjacent to the top of the heat dissipation device. The arcuate depression has a side wall that is located adjacent to the top of the heat dissipation device and the side wall that is located adjacent to the top of the heat dissipation device.

[0010] A first liquid guide hole and a first lead wire through hole are sequentially provided in radial order from outside to inside in each liquid outlet cavity of the heat sink, and a second liquid guide hole and a second lead wire through hole are sequentially provided in radial order from outside to inside in the liquid inlet cavity between any two liquid outlet cavities;

[0011] A third lead through hole and a fourth lead through hole are respectively provided on the right end cover of the housing at positions corresponding to each first lead through hole and each second lead through hole;

[0012] An embedding groove is respectively provided at the position of each first liquid guide through hole and the second liquid guide through hole on the heat dissipation plate, and the embedding groove is located on the right end surface where the heat dissipation plate is fixed to the driver circuit board. A square hole is respectively provided at the position corresponding to each embedding groove on the driver circuit board, and a round hole is respectively provided at the position corresponding to each first lead through hole and each second lead through hole;

[0013] One lead end of each coil of the stator winding passes through the fourth lead through hole in the liquid inlet chamber, the second lead through hole and the circular hole corresponding to the position of the second lead through hole on the driving circuit board in sequence, and the other lead end passes through the third lead through hole in the liquid outlet chamber, the first lead through hole and the circular hole corresponding to the position of the first lead through hole on the driving circuit board in sequence.

[0014] Furthermore, a clamping piece is provided in each square hole on the driving circuit board.

[0015] Furthermore, the clamping member includes a fixing seat, a connecting tube and a clamping arm. The fixing seat is a square block. A central hole is provided in the center of the fixing seat in a vertical direction. One end of the connecting tube passes through the central hole in a vertical direction and is fixed to the central hole. The bottom end of the connecting tube is exposed from the fixing seat and is used to communicate with the first liquid guide hole or the second liquid guide hole. A pair of clamping arms for clamping the lead end are fixed on the side wall of the fixing seat. The other end of the connecting tube is bent and placed on the side of the fixing seat where the clamping arm is provided for connection with the lead end. The fixing seat, the connecting tube and the clamping arm are an integrally formed structure.

[0016] A fixing seat is placed in each square hole of the driving circuit board, and the fixing seat is embedded in the embedding groove on the heat sink. One lead end of each coil is connected to a connecting conduit on the fixing seat located in the liquid inlet chamber, and the other lead end is connected to a connecting conduit on the fixing seat located in the liquid outlet chamber; the cooling liquid in the liquid inlet chamber enters the connecting conduit from the second liquid guide hole, and then flows into the coil through the lead end connected to the connecting conduit to cool the coil, and then the cooling liquid flows from the other lead end and connecting conduit located in the liquid outlet chamber, and then enters the liquid outlet chamber from the second liquid guide hole connected to the connecting conduit, and finally flows out from the liquid outlet located in the liquid outlet chamber.

[0017] Furthermore, a liquid inlet is provided on the edge of the liquid inlet chamber of the right end cover.

[0018] Furthermore, a liquid outlet is provided on the circumferential surface of the second annular boss of the right end cover of the housing, corresponding to each liquid outlet chamber in the radial direction.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the electric drive system for a scraper conveyor for mining provided by the present invention, the controller includes a heat sink and a drive circuit board, the heat sink is fixed on the casing, and a cooling chamber is formed between the heat sink and the casing, so that the casing and the heat sink can be cooled at the same time, and then the stator and the drive circuit board can be cooled; an axial cooling channel is provided on the rotor core of the rotor assembly, and a radial cooling channel is provided radially on the right end plate, the left end of the hollow body section of the rotating shaft is connected with the bottom end of the radial cooling channel, and the coolant can cool the rotor core and the rotating shaft through the axial cooling channel, the radial cooling channel and the hollow body section of the rotating shaft, and the stator winding can be better cooled by connecting the lead end of the stator winding with the cooling chamber, ensuring that the drive motor and the controller of the electric drive system for the scraper conveyor for mining can obtain reliable heat dissipation.

[0020] During installation, the electric drive system for a mining scraper conveyor of the present invention is tilted so that the motor axis is positioned at an angle to the horizontal and extends to the upper right. When the coolant nozzle sprays coolant into the gap area, the coolant, under the action of centrifugal force, enters the rotor core along the axial cooling channel and flows into the cooling chamber through the channel within the hollow body of the rotating shaft. This eliminates the need for a dynamic seal, thereby improving the reliability of the rotor cooling structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the electric drive system for a mining scraper conveyor of the present invention;

[0022] Figure 2 is a schematic structural diagram of the rotor assembly of the present invention;

[0023] Figure 3 is a schematic diagram of the cross-sectional structure of the clamping member;

[0024] Figure 4 It is a schematic diagram of the fixing seat and the clamping arm in the clamping member clamping the lead end;

[0025] Figure 5 1 is a schematic structural diagram of the right end face of the right end cover of the casing;

[0026] Figure 6 yes Figure 5 AA section view in;

[0027] Figure 7 1 is a structural diagram of the left end surface of the heat sink;

[0028] Figure 8 yes Figure 7 BB section in the figure;

[0029] Figure 9 This is a schematic diagram of the installation structure of the controller, clamping parts and lead terminals;

[0030] In the figure: 1. Casing; 101. Left end cover; 102. Right end cover; 1021. Second annular boss; 1022. First U-shaped rib; 1023. Third lead hole; 1024. Fourth lead hole; 1025. Liquid inlet; 1026. Liquid outlet; 2. Stator core; 3. Stator winding; 4. Rotor assembly; 41. Rotor core; 42. Right end plate; 43. Left end plate; 44. Coolant guide ring; 441. Annular body; 442. First annular boss; 45. Coolant inlet hole; 46. Axial cooling channel; 47. Radial Cooling channel; 48. Spacing area; 49. Cooling liquid nozzle; 5. Rotating shaft; 51. Solid body section; 52. Hollow body section; 6. Heat sink; 61. Third annular boss; 62. Second U-shaped rib; 63. First liquid guide hole; 64. First lead wire hole; 65. Second liquid guide hole; 66. Second lead wire hole; 67. Embedded groove; 7. Drive circuit board; 71. Square hole; 72. Round hole; 8. Clamping piece; 81. Fixing seat; 82. Connecting conduit; 83. Clamping arm; 9. Lead wire end; 10. One-way guide valve; 11. Mounting hole. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1

[0033] Reference Figures 1-9 , an electric drive system for a mining scraper conveyor, comprising a motor and a controller, the motor comprising a casing 1, a stator assembly, a rotor assembly 4, and a rotating shaft 5, the stator assembly being fixed to the casing 1, the rotor assembly 4 being fixed to the rotating shaft 5, the rotating shaft 5 being rotatably mounted on the casing along the axial direction, the rotor assembly 4 being placed in the stator assembly, the stator assembly comprising a stator core 2 and a stator winding 3, the stator winding 3 comprising a plurality of coils, each of the coils having two lead ends 9, the controller comprising a heat sink 6 and a driving circuit board 7, the heat sink 6 being fixed to the right end of the casing 1, and a cooling chamber being formed between the heat sink 6 and the casing 1, the driving circuit board 7 being fixed to the right end of the heat sink 6, the lead ends of all the coils respectively passing through the casing 1, the cooling chamber, the heat sink 6 and the driving circuit board 7 in sequence, and a plurality of clamping members 8 for clamping the lead ends 9 are provided on the driving circuit board 7;

[0034] Reference Figure 2The rotor assembly 4 includes a rotor core 41, a right end plate 42, a left end plate 43, a coolant guide ring 44 and a coolant nozzle 49. The left end plate 43 and the right end plate 42 are respectively fixed on both sides of the rotor core 41. The coolant guide ring 44 is fixed on the left end plate 43. The coolant nozzle 49 extends into the casing 1 from the left end cover 101 of the casing 1. The coolant nozzle 49 sprays coolant into the coolant guide ring 44, and the coolant enters the cooling chamber through the rotor assembly 4 and the rotating shaft 5.

[0035] An axial cooling channel 46 is axially provided on the rotor core 41, a coolant inlet hole 45 is provided at a position corresponding to the axial cooling channel 46 on the left end plate 43, and a radial cooling channel 47 is radially provided on the right end plate 42. The top end of the radial cooling channel 47 is connected to the axial cooling channel 46. The rotating shaft axially penetrates the left end plate 43, the rotor core 41 and the right end plate 42 in sequence, and the rotating shaft 5 includes a solid body section 51 and a hollow body section 52. The left end of the hollow body section 52 is connected to the bottom end of the radial cooling channel 47, and a one-way valve 10 is installed on the right end. Mounting holes 11 for the rotating shaft 5 to pass through are respectively provided on the left end cover 101 and the right end cover 102 of the casing 1, and the two ends of the rotating shaft 5 are connected to the mounting holes 11 through bearings.

[0036] The coolant guide ring 44 includes an annular body 441, the left end surface of the annular body 441 extends inward to form a first annular boss 442, the right end surface of the annular body 441 is fixed to the left end plate 43, and is located outside the coolant inlet hole 45. A spacing area 48 is formed between the coolant guide ring 44 and the left end plate 43. The nozzle of the coolant nozzle 49 extends into the spacing area 48 to spray coolant into the spacing area 48. The coolant flows from the coolant inlet hole 45 to the axial cooling channel 46, the radial cooling channel 47 and the hollow body section 52 of the rotating shaft 5 in sequence, and then enters the cooling chamber through the one-way valve 10. The one-way valve 10 allows the coolant to flow into the cooling chamber only from the channel in the hollow body section 52 of the rotating shaft 5.

[0037] Reference Figure 5-Figure 8The right end cover 102 of the housing includes a first disc body, and the outer edge of the first disc body facing the controller extends to the right to form a second annular boss 1021, and a plurality of first U-shaped ribs 1022 are evenly distributed along the inner circumference of the second annular boss 1021. The heat dissipation plate 6 includes a second disc body, and the outer edge of the second disc body facing the housing 1 extends to the left to form a third annular boss 61, and a plurality of second U-shaped ribs 62 are evenly distributed along the inner circumference of the third annular boss 61. The number of U-shaped ribs 62 is the same as the number of first U-shaped ribs 1022 and their positions correspond. The second annular boss 1021 and the third annular boss 61 are affixed and secured with adhesive. After the end faces of each pair of first U-shaped ribs 1022 and second U-shaped ribs 62 are affixed and secured with adhesive, the inner area forms a closed liquid outlet chamber. The areas outside all liquid outlet chambers form liquid inlet chambers. Each of the liquid outlet chambers is not connected to the liquid inlet chamber, and the multiple liquid outlet chambers and the liquid inlet chamber together form a cooling chamber. Separating the liquid outlet chamber from the liquid inlet chamber prevents coolant in the liquid inlet chamber from flowing directly out of the liquid outlet chamber.

[0038] A first liquid guide hole 63 and a first lead wire hole 64 are sequentially provided in the radial direction from the outside to the inside in each liquid outlet cavity of the heat dissipation plate 6, and a second liquid guide hole 65 and a second lead wire hole 66 are sequentially provided in the radial direction from the outside to the inside in the liquid inlet cavity between the two liquid outlet cavities.

[0039] A third lead through hole 1023 and a fourth lead through hole 1024 are respectively provided on the right end cover 102 of the housing 1 at positions corresponding to each first lead through hole 64 and each second lead through hole 66;

[0040] Reference Figure 9 , an embedding groove 67 is respectively provided at the position of each first liquid guiding through hole 63 and the second liquid guiding through hole 65 on the heat dissipation plate 6. The embedding groove 67 is located on the right end surface where the heat dissipation plate 6 and the driving circuit board 7 are fixed. A square hole 71 is respectively provided on the driving circuit board 7 at a position corresponding to each embedding groove 67, and a round hole 72 is respectively provided at a position corresponding to each first lead through hole 64 and each second lead through hole 66;

[0041] One lead end 9 of each coil of the stator winding passes through the fourth lead through hole 1024 in the liquid inlet chamber, the second lead through hole 66 and the circular hole 72 on the driving circuit board 7 corresponding to the position of the second lead through hole 66 in sequence, and the other lead end 9 passes through the third lead through hole 1023 in the liquid outlet chamber, the first lead through hole 64 and the circular hole 72 on the driving circuit board 7 corresponding to the position of the first lead through hole 64 in sequence.

[0042] A clamping member 8 is provided in each square hole 71 on the driving circuit board 7 .

[0043] Reference Figure 1 , Figure 3-Figure 4 and Figure 9 The clamping member 8 includes a fixing seat 81, a connecting conduit 82 and a clamping arm 83. The fixing seat 81 is a square block. A center hole is provided in the center of the fixing seat 81 in the vertical direction. One end of the connecting conduit 82 passes through the center hole in the vertical direction and is fixed to the center hole, and the bottom end of the connecting conduit 82 is exposed from the fixing seat 81, which is used to communicate with the first liquid guide hole 63 of the liquid outlet chamber or the second liquid guide hole 65 of the liquid inlet chamber. A pair of clamping arms 83 for clamping the lead end 9 are fixed on the side wall of the fixing seat 81. The other end of the connecting conduit 82 is bent and placed on the side of the fixing seat 81 where the clamping arm 83 is provided, for connecting with the lead end 9; the fixing seat 81, the connecting conduit 82 and the clamping arm 83 are an integrally formed structure.

[0044] A fixing seat 81 is placed in each square hole 71 of the driving circuit board 7, and the fixing seat 81 is embedded in the embedding groove 67 on the heat sink 6. One lead end 9 of each coil is connected to a connecting pipe 82 on the fixing seat 81 located in the liquid inlet chamber, and the other lead end 9 is connected to a connecting pipe 82 on the fixing seat 81 located in the liquid outlet chamber.

[0045] Reference Figure 5 A liquid outlet 1026 is provided on the circumferential surface of the second annular boss 1021 of the right end cover 102 of the housing 1 in a radial direction corresponding to each liquid outlet chamber.

[0046] The cooling liquid in the liquid inlet chamber enters the connecting duct 82 from the second liquid guide hole 65, and then flows into the coil through the lead end 9 connected to the connecting duct 82 to cool the coil. Then the cooling liquid flows out from the lead end 9 at the other end of the coil located in the liquid outlet chamber and the connecting duct 82 connected to the lead end 9, and then enters the liquid outlet chamber from the second liquid guide hole 65 connected to the connecting duct 82, and finally flows out from the liquid outlet 1026 located in the liquid outlet chamber.

[0047] A liquid inlet 1025 is provided on the edge of the liquid inlet chamber of the right end cover 102. The electric drive system for a mining scraper conveyor of the present invention utilizes a dual liquid inlet mode, in which the liquid inlet 1025 and the one-way valve 10 are used to deliver coolant to the liquid inlet chamber. Because the coils generate the most heat, this dual liquid inlet mode improves the reliability of the cooling coils and prevents them from overheating.

[0048] The stator winding of the present invention is a concentrated winding, and the winding of the unit motor adopts an A+A-C+C-B+B- arrangement.

[0049] The electric drive system for a mining scraper conveyor of the present invention can cool the casing 1 and the heat sink 6 at the same time, and further cool the stator assembly and the drive circuit board 7, by forming a cooling chamber between the heat sink 6 and the casing 1. An axial cooling channel 46 is provided on the rotor core 41 of the rotor assembly 4, and a radial cooling channel 47 is provided radially on the right end plate 42. The left end of the hollow body section 52 of the rotating shaft 5 is connected to the bottom end of the radial cooling channel 47. The coolant can cool the rotor core 41 and the rotating shaft 5 through the axial cooling channel 46, the radial cooling channel 47 and the hollow body section 52 of the rotating shaft 5. By connecting the lead end 9 of the stator winding to the cooling chamber, the stator winding can be better cooled, ensuring that the motor and the controller of the electric drive system for a mining scraper conveyor can obtain reliable heat dissipation.

[0050] During installation, the electric drive system for a mining scraper conveyor of the present invention is tilted so that the motor axis forms an angle with the horizontal and extends to the upper right. When coolant nozzle 49 sprays coolant into spacer region 48, the coolant, under the action of centrifugal force, enters the rotor core 41 along axial cooling channel 46 and flows into the cooling chamber through the channel within the hollow body section 52 of the rotating shaft 5. This invention eliminates the need for a dynamic seal, thereby improving the reliability of the rotor cooling structure.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An electric drive system for a mining scraper conveyor, characterized in that: The motor comprises a housing, a stator assembly, a rotor assembly, and a rotating shaft. The stator assembly is fixed to the housing, the rotor assembly is fixed to the rotating shaft, the rotating shaft is rotatably mounted on the housing along the axial direction, the rotor assembly is placed in the stator assembly, the stator assembly comprises a stator core and a stator winding, the stator winding comprises a plurality of coils, each of the coils has two lead ends, the controller comprises a heat sink and a driving circuit board, the heat sink is fixed to the right end of the housing, and a cooling chamber is formed between the heat sink and the housing, the driving circuit board is fixed to the right end of the heat sink, the lead ends of all the coils respectively pass through the housing, the cooling chamber, the heat sink and the driving circuit board, and a plurality of clamps for clamping the lead ends are provided on the driving circuit board; The rotor assembly includes a rotor core, a right end plate, a left end plate, a coolant guide ring, and a coolant nozzle. The left end plate and the right end plate are respectively fixed on both sides of the rotor core. The coolant guide ring is fixed to the left end plate. The coolant nozzle extends from the left end cover of the casing into the casing. The coolant nozzle sprays coolant into the coolant guide ring. The coolant enters the cooling chamber through the rotor assembly and the rotating shaft. An axial cooling channel is provided axially through the rotor core, a coolant inlet hole is provided at a position corresponding to the axial cooling channel on the left end plate, and a radial cooling channel is provided radially on the right end plate, the top end of the radial cooling channel is connected to the axial cooling channel, the rotating shaft axially penetrates the left end plate, the rotor core and the right end plate in sequence, and the rotating shaft includes a solid body section and a hollow body section, the left end of the hollow body section is connected to the bottom end of the radial cooling channel, and a one-way valve is installed on the right end, and mounting holes for the rotating shaft to pass through are respectively provided on the left end cover and the right end cover of the casing, and both ends of the rotating shaft are connected to the mounting holes through bearings; The right end cover of the casing includes a first disc body, an outer edge of the first disc body facing the controller extending to the right side to form a second annular boss, and a plurality of first U-shaped ribs are evenly distributed along the inner circumference of the second annular boss. The heat dissipation plate includes a second disc body, an outer edge of the second disc body facing the casing extending to the left side to form a third annular boss, and a plurality of second U-shaped ribs are evenly distributed along the inner circumference of the third annular boss. The number of the second U-shaped ribs is the same as the number of the first U-shaped ribs and the positions correspond to each other, the second annular boss and the third annular boss are affixed and fixed with adhesive, and after each pair of the first U-shaped ribs and the second U-shaped rib end faces are affixed and fixed with adhesive, the internal area forms a liquid outlet chamber closed on all sides, and the areas outside all liquid outlet chambers form a liquid inlet chamber, each of the liquid outlet chambers is not connected to the liquid inlet chamber, and the plurality of liquid outlet chambers and the liquid inlet chamber together form a cooling chamber; A first liquid guide hole and a first lead wire through hole are sequentially provided in radial order from outside to inside in each liquid outlet cavity of the heat sink, and a second liquid guide hole and a second lead wire through hole are sequentially provided in radial order from outside to inside in the liquid inlet cavity between any two liquid outlet cavities; A third lead through hole and a fourth lead through hole are respectively provided on the right end cover of the housing at positions corresponding to each first lead through hole and each second lead through hole; An embedding groove is respectively provided at the position of each first liquid guide through hole and the second liquid guide through hole on the heat dissipation plate, and the embedding groove is located on the right end surface where the heat dissipation plate is fixed to the driver circuit board. A square hole is respectively provided at the position corresponding to each embedding groove on the driver circuit board, and a round hole is respectively provided at the position corresponding to each first lead through hole and each second lead through hole; One lead end of each coil of the stator winding passes through the fourth lead through hole in the liquid inlet chamber, the second lead through hole and the circular hole corresponding to the position of the second lead through hole on the driving circuit board in sequence, and the other lead end passes through the third lead through hole in the liquid outlet chamber, the first lead through hole and the circular hole corresponding to the position of the first lead through hole on the driving circuit board in sequence.

2. The electric drive system for a mining scraper conveyor according to claim 1, characterized in that: The coolant guide ring includes an annular body, the left end surface of the annular body extends inward to form a first annular boss, the right end surface of the annular body is fixed to the left end plate, and a spacing area is formed between the coolant guide ring and the left end plate. The nozzle of the coolant nozzle extends into the spacing area and sprays coolant into the spacing area. The coolant flows from the coolant inlet hole to the axial cooling channel, the radial cooling channel and the hollow body section of the rotating shaft in sequence, and then enters the cooling chamber through the one-way valve.

3. The electric drive system for a mining scraper conveyor according to claim 1, characterized in that: A clamping piece is provided in each square hole on the driving circuit board.

4. The electric drive system for a mining scraper conveyor according to claim 1, characterized in that: The clamping member includes a fixing seat, a connecting tube and a clamping arm. The fixing seat is a square block. A central hole is provided in the center of the fixing seat in a vertical direction. One end of the connecting tube passes through the central hole in a vertical direction and is fixed to the central hole. The bottom end of the connecting tube is exposed from the fixing seat and is used to communicate with the first liquid guide hole or the second liquid guide hole. A pair of clamping arms for clamping the lead end are fixed on the side wall of the fixing seat. The other end of the connecting tube is bent and placed on the side of the fixing seat where the clamping arm is provided for connection with the lead end. The fixing seat, the connecting tube and the clamping arm are an integrally formed structure. A fixing seat is placed in each square hole of the driving circuit board, and the fixing seat is embedded in the embedding groove on the heat sink. One lead end of each coil is connected to a connecting conduit on the fixing seat located in the liquid inlet chamber, and the other lead end is connected to a connecting conduit on the fixing seat located in the liquid outlet chamber.

5. The electric drive system for a mining scraper conveyor according to claim 1, characterized in that: A liquid inlet is provided on the edge of the liquid inlet chamber of the right end cover.

6. The electric drive system for a mining scraper conveyor according to claim 1, characterized in that: A liquid outlet is respectively provided on the circumferential surface of the second annular boss of the right end cover of the housing in a radial direction corresponding to each liquid outlet chamber.

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