Coal mine scraper conveyor

Abstract

A scraper conveyor for coal mines relates to the field of coal mining technology. This invention solves the problems of existing scraper conveyors, such as limited functionality, poor scraper stability, easy material leakage, and low material transport efficiency. In this invention, two sets of roller units are respectively rolledly connected to two sets of annular roller guide rails. Both ends of the scraper shaft are rotatably connected to two sets of roller units. A handle is installed at one end of the scraper shaft. The roller units and the scraper shaft are locked and fixed by bushing locking components. The scraper units are located between two trough side structures. Multiple sets of scraper units are respectively installed on the scraper shafts of multiple roller structures. A transmission component is connected to the roller units in all roller structures. The transmission component simultaneously drives multiple roller structures to circulate along the annular roller guide rails, causing the multiple sets of scraper units to move coal along the surface of the upper trough bottom structure until unloading at the head of the scraper conveyor. This invention improves scraper stability and adjusts the scraper tilt angle according to operating conditions.

Description

Technical Field

[0001] This invention relates to the field of coal mining and transportation equipment, and specifically to a coal mine scraper conveyor. Background Technology

[0002] A scraper conveyor is a type of conveyor that uses a scraper chain to transport bulk materials within a trough. In coal mining, scraper conveyors are used to transport coal. Based on the number and arrangement of chains, scraper conveyors can be classified into four types: single-chain, double-chain, double-center-chain, and triple-chain. The main structure of a scraper conveyor includes a head drive unit, an intermediate drive unit, and a tail drive unit. During operation, when the head drive unit starts, it drives the sprocket on the head shaft to rotate, causing the scraper chain to circulate and move the material along the trough until it reaches the head drive unit for unloading. The scraper chain operates in a continuously closed loop around the sprocket, completing the material conveying process.

[0003] Currently, in existing scraper conveyors, the scrapers are directly mounted on the scraper chain. During material transport, the chain vibrates, causing the scrapers mounted on the chain to vibrate when interacting with coal. This results in material leakage due to the large gap between the scraper and the bottom plate. Common methods to address scraper leakage include increasing the scraper's mass to improve transport stability, thereby reducing leakage and increasing material transport efficiency. However, this increases the energy consumption of the drive motor, shortening the machine's lifespan. To avoid this, the scraper height is often reduced. While these methods improve transport stability, they decrease the efficiency of material transport.

[0004] Furthermore, in existing scraper conveyors, the angle between the scraper and the base plate is 90°, and because the scraper and scraper chain are fixedly connected, the scraper inclination angle cannot be adjusted. In actual production, if the scraper height is low, the scraper inclination angle has little impact on resistance and energy consumption. However, for production situations requiring high efficiency, due to the higher scraper height and the need to convey more material per batch, the scraper inclination angle has a significant impact on resistance and energy consumption.

[0005] In summary, existing scraper conveyors suffer from problems such as limited functionality, poor scraper stability, easy material leakage, and low material transport efficiency. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of existing scraper conveyors, such as limited functionality, poor scraper stability, easy material leakage, and low material transportation efficiency, and to provide a scraper conveyor for coal mines.

[0007] The technical solution of this invention is:

[0008] A coal mine scraper conveyor includes a frame 1, a trough assembly 2, a roller assembly 3, a scraping assembly 4, and a transmission assembly 5. The trough assembly 2 is mounted on the frame 1. The trough assembly 2 includes an upper trough bottom structure 21, a lower trough bottom structure 22, and two side trough structures 23. The upper and lower trough bottom structures 21 and 22 are horizontally arranged from top to bottom inside the frame 1. The two side trough structures 23 are vertically arranged opposite each other along the length of the frame 1 on the left and right sides of the upper and lower trough bottom structures 21 and 22. The lower trough bottom structure 22 is movably connected to two sidewall structures 23 at both ends, and fixedly connected to two sidewall structures 23 at both ends. Two sets of oppositely arranged annular roller guide rails 24 are respectively provided on the two sidewall structures 23. The annular roller guide rails 24 vertically penetrate the sidewalls of the sidewall structures 23. The roller assembly 3 includes multiple roller structures 31, which are arranged horizontally and equally spaced from front to back along the annular roller guide rails 24. Each roller structure 31 is a single-axis double-wheel structure, and each roller structure 31 includes a scraper... The system includes a plate shaft 311, a bushing locking member 312, a handle 314, and two sets of roller units 313. The two sets of roller units 313 are respectively tactilely connected to two sets of annular roller guide rails 24. A horizontally arranged scraper shaft 311 is provided between the two sets of roller units 313. Both ends of the scraper shaft 311 are rotatably connected to the two sets of roller units 313. A handle 314 is installed at one end of the scraper shaft 311. A bushing locking member 312 is installed on each roller unit 313. The roller units 313 and the scraper shaft 311 are connected by the bushing locking member 312. The material scraping assembly 4 is locked and fixed, and includes multiple scraper units 41. The scraper units 41 are located between two trough side structures 23. The multiple scraper units 41 are respectively installed on the scraper shafts 311 of multiple roller structures 31. The transmission assembly 5 is connected to the roller units 313 in all roller structures 31. The transmission assembly 5 simultaneously drives multiple roller structures 31 to circulate along the annular roller guide rail 24, so that the multiple scraper units 41 drive the coal to move along the surface of the upper trough bottom structure 21 until it reaches the head of the scraper conveyor to complete the unloading.

[0009] Furthermore, the transmission assembly 5 includes a motor reducer 51, two scraper chains 52, two sets of sprocket drive units 53, and multiple scraper chain connecting frames 54. The two sets of sprocket drive units 53 are located at the head and tail of the scraper conveyor, respectively. Each sprocket drive unit 53 includes a drive shaft 531 and two sprockets 532. The drive shaft 531 is horizontally positioned between the upper trough bottom structure 21 and the lower trough bottom structure 22. The two sprockets 532 are vertically positioned opposite each other on the outside of the two trough side structures 23. The two ends of the drive shaft 531 pass through the two trough side structures 23 and the two sprockets 532 from the outside to the inside, and are coaxially connected to the frame 1 via bearings. The speed reducer 51 is located on one side of the drive shaft 531. The motor reducer 51 is installed on the outer wall of the corresponding groove structure 23. The shaft of the motor reducer 51 is connected to one end of the drive shaft 531. Both sprockets 532 are fixedly connected to the drive shaft 531 by flat keys. Two sprockets 532 in one set of sprocket drive units 53 are respectively connected to two sprockets 532 in another set of sprocket drive units 53 by two scraper chains 52. Two scraper chain connecting frames 54 are respectively installed on the outer ends of the two sets of roller units 313 in each roller structure 31. The ends of all scraper chain connecting frames 54 are fixedly connected to the chain links 521 in the corresponding sprockets 532.

[0010] Furthermore, an annular chain groove 5321 is radially formed at the center of the outer side of the sprocket 532. A semi-circular groove 5322 is machined at the bottom of the annular chain groove 5321. The diameter of the semi-circular groove 5322 is equal to the diameter of the link 521 in the scraper chain. Guide inclined surfaces 5323 are machined on both sides of the upper part of the annular chain groove 5321. The angle between the guide inclined surface 5323 and the vertical plane is α, where α = 5-25°. The distance between the tops of the guide inclined surfaces 5323 on both sides is L1. The diameter of the link 521 in the scraper chain is less than L1. The sprocket 532... The outer side of the 32 is machined with steps symmetrically distributed on both sides of the annular chain groove 5321. The transverse step surface 5324 of the steps is a horizontal plane, and the longitudinal step surface 5325 of the steps is an inclined plane. The included angle between the transverse step surface 5324 and the longitudinal step surface 5325 is β, where β = 100-120°. The distance between the middle of the two rods in the link 521 of the scraper chain is L2. The distance between the bottom of the longitudinal steps in the two side steps is L3, where L2 < L3. The distance between the top of the longitudinal steps in the two side steps is L4, where L4 < L2.

[0011] Further, the trough structure 23 includes an upper trough side 1 231, a lower trough side 1 232, an upper trough side 2 233, a lower trough side 2 234, four end trough sides 235, multiple trough side crossbeams 236, multiple first-stage wheel baffles 237, and multiple second-stage wheel baffles 238. The upper trough side 1 231 and the lower trough side 1 232 are arranged horizontally from top to bottom along the length of the scraper conveyor. The upper end of the upper trough side 1 231 and the outer side wall of the lower trough side 1 232 are both connected to the frame 1 through multiple trough side crossbeams 236. The lower end face of the upper trough side 1 231 and the middle of the upper end face of the upper trough side 1 231 are provided with wheel limiting bosses along the length direction. The cross-sections of the two wheel limiting bosses are both isosceles trapezoids and are arranged axially symmetrically. The lower end face of the lower trough side 1 232 is arranged horizontally from front to back along the length direction. Multiple vertically arranged lifting troughs 239 are evenly distributed. A rectangular hollow region 2310 is formed between the upper trough side 1 231 and the lower trough side 1 232. The lower trough side 234 and the upper trough side 233 are arranged horizontally from top to bottom along the length of the scraper conveyor. The lower end of the upper trough side 233 and the outer wall of the lower trough side 234 are connected to the frame 1 through multiple trough side crossbeams 236. The lower end face of the lower trough side 234 and the middle of the upper end face of the upper trough side 233 are provided with wheel limiting bosses 2 along the length direction. The cross-sections of the two wheel limiting bosses 2 are both isosceles trapezoids and are arranged axially symmetrically. A rectangular hollow region 2311 is formed between the lower trough side 234 and the upper trough side 233. The lower sides of the upper trough side 1 231 and the upper sides of the lower trough side 232 are provided with wheel limiting bosses 2. Multiple vertically arranged baffle plates 237 are installed. Between two corresponding sets of baffle plates 237, there is an upper hollow area for installing the roller unit 313. Multiple vertically arranged baffle plates 238 are installed on both sides of the lower groove side 234 and both sides of the upper groove side 233. Between two corresponding sets of baffle plates 238, there is a lower hollow area for installing the roller unit 313. Each groove side structure 23 has two vertically arranged end groove sides 235 at its front and rear ends. The end groove side 235 includes an inner groove side 2351, an outer groove side 2352, and multiple baffle plates 2353. The inner groove side 2351 and the outer groove side 2352 are both semi-circular ring structures, arranged sequentially from the outside to the inside. The inner groove side 2351 is coaxially arranged, with its two ends connected to the ends of the upper groove side 1 231 and the upper groove side 2 233, respectively. The outer groove side 2352 is connected to the ends of the lower groove side 1 232 and the lower groove side 2 234, respectively. A semi-circular hollow area 2312 is formed between the inner groove side 2351 and the outer groove side 2352. The rectangular hollow area 1 2310, the rectangular hollow area 2311, and the semi-circular hollow areas 2312 on the front and rear sides form an annular roller guide rail 24. A wheel limiting boss 3 is provided in the middle of the outer side of the inner groove side 2351 along the circumferential direction. A wheel limiting boss 4 is provided in the middle of the inner side of the outer groove side 2352 along the circumferential direction. The cross-sections of wheel limiting boss 3 and wheel limiting boss 4 are both isosceles trapezoids, and wheel limiting boss 1 and wheel limiting boss 2 correspond to each other.Multiple vertically arranged baffle plates 2353 are installed on both outer sides of the inner groove side 2351 and both inner sides of the outer groove side 2352. The corresponding sets of inner and outer baffle plates 2353 form a hollow end area for mounting the roller unit 313.

[0012] Further, the lower trough bottom structure 22 includes a lower trough bottom plate 221, which is horizontally arranged above the two lower trough sides 234 along the length of the scraper conveyor. The lower end face of the lower trough bottom plate 221 is fixedly connected to the upper end face of the two lower trough sides 234 on both sides. The upper trough bottom structure 21 includes an upper trough bottom plate 211, two sets of side baffles 212, multiple trough bottom plate lifting mechanisms 213, and multiple limiting blocks 214. Vertically arranged trough bottom plate lifting mechanisms 213 are installed in the lifting grooves 239 at the bottom of the two lower trough sides 232. The upper trough bottom plate 211 is horizontally arranged below the two lower trough sides 232 along the length of the scraper conveyor. The upper end face of the upper trough bottom plate 211 is connected to the extended ends of several trough bottom plate lifting mechanisms 213 on both sides. A rectangular baffle groove 2321 is machined on the inner side of 232. The bottom of the rectangular baffle groove 2321 is connected to the lower end face of the lower groove side 232. Multiple limiting blocks 214 are evenly arranged from left to right along the length direction of the rectangular baffle groove 2321. The limiting blocks 214 are rectangular limiting blocks. The side baffles 212 are rectangular plate structures. Two sets of side baffles 212 are slidably inserted into the rectangular baffle grooves 2321 on the inner side of the two lower groove side 232 from bottom to top. The upper end face of the side baffles 212 is evenly arranged with baffle sliding grooves 2121 from left to right along the length direction. The baffle sliding grooves 2121 are rectangular grooves. Multiple baffle sliding grooves 2121 correspond one-to-one with multiple rectangular limiting blocks. The rectangular limiting blocks are slidably inserted into the baffle sliding grooves 2121.

[0013] Furthermore, the bottom plate lifting mechanism 213 includes an electric push rod 2131, an electric cylinder connector 2132, a push rod connecting pin 2133, and a push rod hinge seat 2134. The electric push rod 2131 is vertically installed in the lifting groove 239 at the bottom of the lower trough side 232. The housing of the electric push rod 2131 is connected to the lower trough side 232 through the electric cylinder connector 2132. The end of the telescopic rod of the electric push rod 2131 is rotatably connected to the upper part of the push rod hinge seat 2134 through the push rod connecting pin 2133. The push rod hinge seat 2134 is installed on the upper surface of the bottom plate 221.

[0014] Furthermore, the roller unit 313 includes a roller mounting block 3131, two main roller seats 3132, two main roller shafts 3133, four main rollers 3134, four limiting sleeves 3135, and four roller locking nuts 3136. The roller mounting block 3131 is a cuboid block structure. A horizontally arranged scraper shaft mounting hole is machined at the center of the end face of the roller mounting block 3131. The scraper shaft 311 is inserted into the scraper shaft mounting hole. Two main roller seats 3132 are respectively mounted on the upper and lower end faces of the roller mounting block 3131. The two main roller seats 3132 are arranged back to back. The main wheel seat 3132 is machined with a horizontally arranged main wheel mounting shaft hole. A main wheel shaft 3133 is inserted into the main wheel mounting shaft hole. Two main wheels 3134 are coaxially arranged on the left and right sides of the main wheel seat 3132. The two main wheels 3134 are rotatably mounted on both ends of the main wheel shaft 3133. A limiting sleeve 3135 is provided between the inner side of each main wheel 3134 and the main wheel seat 3132. A roller locking nut 3136 is provided on the outer side of each main wheel 3134. The roller locking nut 3136 is threadedly connected to the end of the main wheel shaft 3133.

[0015] Furthermore, the roller unit 313 also includes two auxiliary wheel units 3137, which are respectively disposed at the front and rear ends of the roller mounting block 3131. Each auxiliary wheel unit 3137 includes a mounting bracket 31371, an auxiliary wheel seat 31372, an auxiliary wheel axle 31373, a spring 31374, a guide rod 31375, two auxiliary wheels 31376, two limiting sleeves, and two roller locking nuts. The mounting bracket 31371 is mounted on the end of the roller mounting block 3131. An auxiliary wheel seat 31372 is mounted on the lower end face of the mounting bracket 31371. A vertically arranged strip-shaped groove is formed on the side of the auxiliary wheel seat 31372, with its left and right ends respectively communicating with the left and right end faces of the auxiliary wheel seat 31372. A semi-circular concave surface is formed at the bottom of the strip-shaped groove. An auxiliary wheel axle 31373 is inserted into the strip-shaped groove. Two coaxially arranged auxiliary wheels 31376 are respectively provided on the left and right sides of the auxiliary wheel seat 31372. The two auxiliary wheels 31376 can respectively... The rotating assembly is mounted on both ends of the auxiliary wheel shaft 31373. A limiting sleeve is provided between the inner side of each auxiliary wheel 31376 and the auxiliary wheel seat 31372. A roller locking nut is provided on the outer side of each auxiliary wheel 31376. The roller locking nut is threadedly connected to the end of the auxiliary wheel shaft 31373. A guide rod through hole, communicating with the strip-shaped groove, is provided on the upper surface of the mounting bracket 31371 along the vertical direction. A vertically arranged guide rod connecting threaded hole is provided on the side of the auxiliary wheel shaft 31373. A spring... 31374 is vertically installed in the strip-shaped through groove and located above the auxiliary wheel shaft 31373. The guide rod connecting threaded hole is coaxially arranged with the guide rod through hole and the inner hole of the spring 31374. The lower end of the guide rod 31375 has an external thread. The lower end of the guide rod 31375 passes vertically through the guide rod through hole and the inner hole of the spring 31374 from top to bottom and is threadedly connected to the guide rod connecting threaded hole of the auxiliary wheel shaft 31373. The upper end of the guide rod 31375 has a hexagonal prism that matches the wrench.

[0016] Furthermore, the distance between the center of the semi-circular concave surface at the bottom of the strip groove on the side of the auxiliary wheel seat 31372 and the center of the main wheel mounting shaft hole of the main wheel seat 3132 below the roller mounting block 3131 is L5, where L5 = 10-20mm.

[0017] Furthermore, the scraper unit 41 includes a scraper 411 and a plurality of scraper connecting bolts 412. The scraper 411 has a rectangular plate structure. The upper end face of the scraper 411 has a scraper mounting groove 413 along the height direction. The front end face of the scraper 411 has a plurality of first scraper connecting holes 414 evenly distributed from left to right along the width direction. The first scraper connecting holes 414 penetrate vertically through the scraper mounting groove. The first scraper connecting holes 414 are elongated holes arranged along the length direction of the scraper. The scraper shaft 311 has a plurality of second scraper connecting holes 3111 radially distributed in the middle. The plurality of second scraper connecting holes 3111 correspond one-to-one with the plurality of first scraper connecting holes 414. The scraper shaft 311 is horizontally installed in the scraper mounting groove 413 on the upper part of the scraper 411. The scraper shaft 311 is detachably connected to the scraper 411 by a plurality of scraper connecting bolts 412.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. In the coal mine scraper conveyor of the present invention, the scraper can adjust its tilt angle according to the operating conditions. The main wheel mounting shaft hole on the main wheel seat is rotatably connected to the main wheel shaft. By rotating the handle, the tilt angle of the scraper mounted on the scraper shaft can be adjusted. When the scraper tilt angle is adjusted to a suitable position, the scraper shaft and the main wheel seat are locked and fixed by screwing in the bushing locking member.

[0020] 2. The upper trough bottom structure of the coal mine scraper conveyor of the present invention has the function of lifting the upper trough bottom plate, and the left and right sides of the upper trough bottom plate are provided with movable side baffles, thereby avoiding the problem of material leakage when the upper trough bottom plate moves up and down. The upper trough bottom plate is designed to be height-adjustable to match the working posture of the scraper. The lifting height of the upper trough bottom plate changes with the scraper tilt angle; the larger the scraper tilt angle, the higher the lifting height of the upper trough bottom plate; the smaller the scraper tilt angle, the lower the lifting height of the upper trough bottom plate. In order to match the lifting of the upper trough bottom plate, two sets of side baffles are provided on the left and right sides of the upper trough bottom plate. There is a large space between the side baffles and the top of the rectangular baffle trough, so that the side baffles can slide up and down with the lifting and lowering of the upper trough bottom plate, avoiding material leakage from the side of the trough.

[0021] 3. The coal mine scraper conveyor of the present invention can effectively improve the operational stability of the scraper. The roller structure is a single-shaft double-wheel structure. By setting wheel limiting bosses in the middle of the upper and lower sides of the annular roller guide rail, the single-shaft double-wheel structure is limited, effectively preventing the roller structure from detaching from the annular roller guide rail during operation. By setting two auxiliary wheel units at the front and rear ends of the roller mounting block, the problem of the roller unit tilting forward or backward when moving along the annular roller guide rail can be avoided. On the one hand, when the roller unit moves to the horizontal section of the annular roller guide rail, the auxiliary wheel shaft pushes the auxiliary wheel under the action of the spring to apply slight compression to the annular roller guide rail, thereby improving the stability of the roller unit; on the other hand, when the roller unit moves to the turning point of the annular roller guide rail, the spring can compensate for the gap between the auxiliary wheel and the surface of the annular roller guide rail, which also plays a stabilizing role for the roller unit.

[0022] 4. In the coal mine scraper conveyor of this invention, the annular chain groove on the outer surface of the sprocket is used to match the longitudinal links of the scraper chain. The guide chain bevels machined on both sides of the upper part of the annular chain groove guide the chain links, allowing the longitudinal chain links to fall smoothly into the annular chain groove. The longitudinal stepped surface of the outer side of the sprocket is beveled, ensuring that the transverse chain links in the scraper chain can fall smoothly onto the steps on both sides of the outer side of the sprocket, thereby ensuring full contact between the bottom of the longitudinal chain links in the scraper chain and the semi-circular groove at the bottom of the annular chain groove. This effectively improves the gripping force between the chain links and the sprocket, avoids slippage, and makes the traction of the scraper chain on the roller assembly and scraper assembly more stable, further solving the problem of material leakage. Attached Figure Description

[0023] Figure 1 This is a front view of the coal mine scraper conveyor of the present invention after removing the motor reducer, roller assembly and scraper assembly;

[0024] Figure 2 yes Figure 1 Sectional view at EE;

[0025] Figure 3 yes Figure 2 A cross-sectional view at CC of the coal mine scraper conveyor after the trough assembly and roller assembly are assembled.

[0026] Figure 4 This is a front view of the assembled frame and trough assembly of the coal mine scraper conveyor of the present invention;

[0027] Figure 5 yes Figure 4 Sectional view at DD;

[0028] Figure 6 This is a front view of the roller assembly in the coal mine scraper conveyor of the present invention after removing the auxiliary wheel unit;

[0029] Figure 7 This is a side view of the sprocket in the coal mine scraper conveyor of the present invention;

[0030] Figure 8 yes Figure 7 Sectional view at BB;

[0031] Figure 9 This is a front view of the scraper in the coal mine scraper conveyor of the present invention;

[0032] Figure 10 yes Figure 9 Sectional view at AA;

[0033] Figure 11 yes Figure 2 A magnified view of the area at point F;

[0034] Figure 12 yes Figure 2 A magnified view of the area at point G;

[0035] Figure 13 This is a front view of the roller unit in the coal mine scraper conveyor of the present invention after removing the auxiliary wheel unit;

[0036] Figure 14 This is a side view of the roller unit in the coal mine scraper conveyor of the present invention.

[0037] In the diagram: 1. Frame; 2. Tank assembly; 21. Upper tank bottom structure; 211. Upper tank bottom plate; 212. Side baffle; 2121. Baffle slide groove; 213. Tank bottom plate lifting mechanism; 2131. Electric push rod; 2132. Electric cylinder connector; 2133. Push rod connecting pin; 2134. Push rod hinge seat; 214. Limiting block; 22. Lower tank bottom structure; 221. Lower tank bottom plate; 23. Tank side structure; 231. Upper tank side 1; 232. Lower tank side 1; 2321. Rectangular 233. Baffle groove; 234. Upper groove side 2; 235. Lower groove side 2; 236. End groove side; 2351. Inner groove side; 2352. Outer groove side; 2353. Baffle plate; 236. Groove side crossbeam; 237. Baffle plate 1; 238. Baffle plate 2; 239. Lifting groove; 2310. Rectangular hollow area 1; 2311. Rectangular hollow area 2; 2312. Semi-circular hollow area; 3. Roller assembly; 31. Roller structure; 311. Scraper shaft; 3111. Second scraper connecting hole 312. Bushing locking component; 313. Roller unit; 3131. Roller mounting block; 31311. Locking threaded hole; 3132. Main wheel seat; 3133. Main wheel shaft; 3134. Main wheel; 3135. Limiting sleeve one; 3136. Roller locking nut one; 3137. Auxiliary wheel unit; 31371. Mounting bracket; 31372. Auxiliary wheel seat; 31373. Auxiliary wheel shaft; 31374. Spring; 31375. Guide rod; 31376. Auxiliary wheel; 314. 4. Handle; 5. Scraper assembly; 6. Scraper unit; 7. Scraper; 8. Scraper connecting bolt; 9. Scraper mounting slot; 10. First scraper connecting hole; 11. Transmission assembly; 12. Motor reducer; 13. Scraper chain; 14. Sprocket transmission unit; 15. Drive shaft; 16. Sprocket; 17. Annular chain groove; 18. Semi-circular groove; 19. Guide chain inclined surface; 10. Transverse step surface; 11. Longitudinal step surface; 12. Scraper chain connecting frame. Detailed Implementation

[0038] Specific implementation method one: Combining Figures 1 to 14This embodiment describes a coal mine scraper conveyor, which includes a frame 1, a trough assembly 2, a roller assembly 3, a scraping assembly 4, and a transmission assembly 5. The trough assembly 2 is mounted on the frame 1. The trough assembly 2 includes an upper trough bottom structure 21, a lower trough bottom structure 22, and two trough side structures 23. The upper trough bottom structure 21 and the lower trough bottom structure 22 are arranged horizontally from top to bottom inside the frame 1. The two trough side structures 23 are arranged vertically opposite each other along the length of the frame 1, to the left and right of the upper trough bottom structure 21 and the lower trough bottom structure 22. On both sides, the upper bottom structure 21 is movably connected to two side structures 23 at both ends, and the lower bottom structure 22 is fixedly connected to two side structures 23 at both ends. Two sets of oppositely arranged annular roller guides 24 are respectively provided on the two side structures 23. The annular roller guides 24 vertically penetrate the side walls of the side structures 23. The roller assembly 3 includes multiple roller structures 31, which are arranged horizontally and equally spaced from front to back along the annular roller guides 24. Each roller structure 31 is a single-axis, double-wheel structure. Structure 31 includes a scraper shaft 311, a bushing locking member 312, a handle 314, and two sets of roller units 313. The two sets of roller units 313 are respectively tactilely connected to two sets of annular roller guide rails 24. A horizontally arranged scraper shaft 311 is provided between the two sets of roller units 313. Both ends of the scraper shaft 311 are rotatably connected to the two sets of roller units 313. A handle 314 is installed at one end of the scraper shaft 311. The bushing locking member 312 is installed on the roller unit 313. The roller unit 313 and the scraper shaft 311 are locked together by the bushing. The component 312 is locked and fixed. The scraper assembly 4 includes multiple scraper units 41. The scraper units 41 are located between two trough side structures 23. The multiple scraper units 41 are respectively installed on the scraper shafts 311 of multiple roller structures 31. The transmission assembly 5 is connected to the roller units 313 in all roller structures 31. The transmission assembly 5 simultaneously drives multiple roller structures 31 to circulate along the annular roller guide rail 24, so that the multiple scraper units 41 drive the coal to move along the surface of the upper trough bottom structure 21 until it reaches the head of the scraper conveyor to complete the unloading.

[0039] In this embodiment, the bushing locking component 312 is a flat-head screw.

[0040] Specific Implementation Method Two: Combining Figures 1 to 14This embodiment describes the transmission assembly 5, which includes a motor reducer 51, two scraper chains 52, two sets of sprocket drive units 53, and multiple scraper chain connecting frames 54. The two sets of sprocket drive units 53 are located at the head and tail of the scraper conveyor, respectively. Each sprocket drive unit 53 includes a drive shaft 531 and two sprockets 532. The drive shaft 531 is horizontally positioned between the upper trough bottom structure 21 and the lower trough bottom structure 22. The two sprockets 532 are vertically positioned opposite each other on the outside of the two trough side structures 23. The two ends of the drive shaft 531 pass through the two trough side structures 23 and the two sprockets 532 from the outside to the inside, and are coaxially connected to the frame 1 via bearings for rotational connection. Next, the motor reducer 51 is located on one side of the drive shaft 531. The motor reducer 51 is installed on the outer wall of the corresponding groove structure 23. The rotating shaft of the motor reducer 51 is connected to one end of the drive shaft 531. Both sprockets 532 are fixedly connected to the drive shaft 531 by flat keys. Two sprockets 532 in one set of sprocket drive units 53 are respectively connected to two sprockets 532 in another set of sprocket drive units 53 by two scraper chains 52. Two scraper chain connecting frames 54 are respectively installed on the outer ends of the two sets of roller units 313 in each roller structure 31. The ends of all scraper chain connecting frames 54 are fixedly connected to the chain links 521 in the corresponding sprockets 532. With this configuration, the motor reducer 51 drives the transmission shaft 531 to rotate, which in turn drives the two sprockets 532 at the tail end to rotate. The two sprockets 532 at the tail end drive the two sprockets 532 at the head end to rotate via two scraper chains 52. The two scraper chains 52 drive the two sets of roller units 313 in all roller structures 31 to roll forward along the two sets of annular roller guide rails 24 via scraper chain connecting frames 54. Other components and connections are the same as in specific embodiment one.

[0041] Specific implementation method three: Combining Figures 1 to 14In this embodiment, the sprocket 532 has an annular chain groove 5321 radially formed at the center of its outer side. A semi-circular groove 5322 is machined at the bottom of the annular chain groove 5321, the diameter of which is equal to the diameter of the link 521 in the scraper chain. Guide inclined surfaces 5323 are machined on both sides of the upper part of the annular chain groove 5321. The angle between the guide inclined surface 5323 and the vertical plane is α, where α = 5-25°. The distance between the tops of the guide inclined surfaces 5323 on both sides is L1. The diameter of the link 521 in the scraper chain is less than L1. The sprocket 532 has symmetrically distributed steps on both sides of the annular chain groove 5321 on its outer surface. The transverse step surface 5324 of the steps is horizontal, and the longitudinal step surface 5325 of the steps is inclined. The angle between the transverse step surface 5324 and the longitudinal step surface 5325 is β, where β = 100-120°. The distance between the middle of the two links in the scraper chain 521 is L2, the distance between the bottom of the longitudinal steps in the two side steps is L3, where L2 < L3, and the distance between the top of the longitudinal steps in the two side steps is L4, where L4 < L2. This configuration allows the annular chain groove 5321 on the outer surface of the sprocket 532 to match the longitudinal links 521 in the scraper chain. The guide inclined surfaces 5323 machined on both sides of the upper part of the annular chain groove 5321 guide the links 521, allowing the longitudinal links 521 to fall smoothly into the annular chain groove 5321. The longitudinal stepped surface 5325 on the outer side of the sprocket 532 is inclined, which ensures that the transverse links 521 in the scraper chain can smoothly fall onto the steps on both sides of the outer side of the sprocket 532, thereby ensuring that the bottom of the longitudinal links 521 in the scraper chain is in full contact with the semi-circular groove 5322 at the bottom of the annular chain groove 5321. This effectively improves the gripping force between the links 521 and the sprocket 532, avoids slippage, and makes the traction of the scraper chain on the roller assembly 3 and the scraper assembly 4 more stable, further solving the problem of material leakage. Other components and connections are the same as in specific embodiments one or two.

[0042] Specific implementation method four: Combination Figures 1 to 14This embodiment describes the trough structure 23, which includes an upper trough side 1 231, a lower trough side 1 232, an upper trough side 2 233, a lower trough side 2 234, four end trough sides 235, multiple trough side crossbeams 236, multiple first-stage wheel baffles 237, and multiple second-stage wheel baffles 238. The upper trough side 1 231 and the lower trough side 1 232 are arranged horizontally from top to bottom along the length of the scraper conveyor. The upper end of the upper trough side 1 231 and the outer side wall of the lower trough side 1 232 are both connected to the frame 1 through multiple trough side crossbeams 236. The lower end face of the upper trough side 1 231 and the middle of the upper end face of the upper trough side 1 231 are provided with wheel limiting bosses along the length direction. The cross-sections of the two wheel limiting bosses are both isosceles trapezoids and are arranged axially symmetrically. The lower end face of the lower trough side 1 232 is arranged along the length direction. Multiple vertically arranged lifting troughs 239 are evenly distributed from front to back. A rectangular hollow area 2310 is formed between the upper trough side 1 231 and the lower trough side 1 232. The lower trough side 234 and the upper trough side 233 are arranged horizontally from top to bottom along the length of the scraper conveyor. The lower end of the upper trough side 233 and the outer wall of the lower trough side 234 are connected to the frame 1 through multiple trough side beams 236. The lower end face of the lower trough side 234 and the middle of the upper end face of the upper trough side 233 are provided with wheel limiting bosses 2 along the length direction. The cross-sections of the two wheel limiting bosses 2 are both isosceles trapezoids and are arranged axially symmetrically. A rectangular hollow area 2311 is formed between the lower trough side 234 and the upper trough side 233. The lower sides of the upper trough side 1 231 and the lower trough side 232 are connected horizontally along the length of the scraper conveyor. Multiple vertically arranged baffle plates 237 are installed on both sides of the upper part. A hollow upper area for installing the roller unit 313 is provided between two corresponding sets of baffle plates 237. Multiple vertically arranged baffle plates 238 are installed on both sides of the lower groove side 234 and both sides of the upper groove side 233. A hollow lower area for installing the roller unit 313 is provided between two corresponding sets of baffle plates 238. Each groove side structure 23 has two vertically arranged end groove sides 235 at its front and rear ends. The end groove side 235 includes an inner groove side 2351, an outer groove side 2352, and multiple baffle plates 2353. Both the inner groove side 2351 and the outer groove side 2352 are semi-circular ring structures, arranged from the outside inwards. Arranged coaxially in sequence, the inner groove side 2351 is connected at both ends to the ends of the upper groove side 1 231 and the upper groove side 233, respectively, and the outer groove side 2352 is connected at both ends to the ends of the lower groove side 1 232 and the lower groove side 234, respectively. A semi-circular hollow area 2312 is formed between the inner groove side 2351 and the outer groove side 2352. The rectangular hollow area 1 2310, the rectangular hollow area 2311, and the semi-circular hollow areas 2312 on the front and rear sides form an annular roller guide rail 24. A wheel limiting boss 3 is provided in the middle of the outer side of the inner groove side 2351 along the circumferential direction, and a wheel limiting boss 4 is provided in the middle of the inner side of the outer groove side 2352 along the circumferential direction. The cross-sections of the wheel limiting boss 3 and the wheel limiting boss 4 are both isosceles trapezoids, and the wheel limiting boss 1 and the wheel limiting boss 2 correspond to each other.Multiple vertically arranged baffle plates 2353 are installed on both outer sides of the inner groove side 2351 and both inner sides of the outer groove side 2352. A hollow end area for mounting the roller unit 313 is formed between the two corresponding sets of baffle plates 2353. With this configuration, the roller structure 31 is a single-axis double-wheel structure. Wheel limiting bosses are provided in the middle of the upper and lower sides of the annular roller guide 24 to limit the single-axis double-wheel structure, effectively preventing the roller structure 31 from detaching from the annular roller guide 24 during operation. Simultaneously, the single-axis double-wheel structure and the groove side are designed as separate structures for easy installation and disassembly. Other components and connections are the same as in specific embodiments one, two, or three.

[0043] Specific Implementation Method Five: Combining Figures 1 to 14This embodiment describes the lower trough bottom structure 22, which includes a lower trough bottom plate 221. The lower trough bottom plate 221 is horizontally arranged above two lower trough sides 234 along the length of the scraper conveyor. The lower end face of the lower trough bottom plate 221 is fixedly connected to the upper end face of the two lower trough sides 234 on both sides. The upper trough bottom structure 21 includes an upper trough bottom plate 211, two sets of side baffles 212, multiple trough bottom plate lifting mechanisms 213, and multiple limiting blocks 214. Vertically arranged trough bottom plate lifting mechanisms 213 are installed in the lifting grooves 239 at the bottom of the two lower trough sides 232. The upper trough bottom plate 211 is horizontally arranged below the two lower trough sides 232 along the length of the scraper conveyor. The upper end face of the upper trough bottom plate 211 is connected to the extended ends of multiple trough bottom plate lifting mechanisms 213 on both sides. A rectangular baffle groove 2321 is machined on the inner side of the lower groove side 232. The bottom of the rectangular baffle groove 2321 is connected to the lower end face of the lower groove side 232. Multiple limiting blocks 214 are evenly arranged from left to right along the length direction of the rectangular baffle groove 2321. The limiting blocks 214 are rectangular limiting blocks. The side baffles 212 are rectangular plate structures. Two sets of side baffles 212 are slidably inserted into the rectangular baffle grooves 2321 on the inner side of the two lower groove side 232 from bottom to top. The upper end face of the side baffles 212 is evenly arranged from left to right along the length direction of the baffles 2121. The baffles 2121 are rectangular grooves. Multiple baffles 2121 correspond one-to-one with multiple rectangular limiting blocks. The rectangular limiting blocks are slidably inserted into the baffles 2121. This configuration, with the upper trough bottom plate 211 designed to be height-adjustable, is to accommodate the working position of the scraper 411. The lifting height of the upper trough bottom plate 211 varies with the tilt angle of the scraper 411; the greater the tilt angle, the higher the lifting height of the upper trough bottom plate 211; the smaller the tilt angle, the lower the lifting height. To facilitate the lifting of the upper trough bottom plate 211, two sets of side baffles 212 are provided on the left and right sides of the upper trough bottom plate 211. A large space exists between the side baffles 212 and the top of the rectangular baffle groove 2321, allowing the side baffles 212 to slide up and down with the lifting of the upper trough bottom plate 211, preventing material leakage from the sides of the trough. Other components and connections are the same as in specific embodiments one, two, three, or four.

[0044] In this embodiment, the distance between the lower end face of the lower trough bottom plate 221 and the lower end face of the upper trough side plate 233 is 20-50mm longer than the length of the scraper 411, ensuring that when the scraper 411 is in a vertical state, it can pass smoothly under the lower trough bottom plate 221 to complete the cyclic operation.

[0045] Specific Implementation Method Six: Combination Figures 1 to 14This embodiment describes a bottom plate lifting mechanism 213 comprising an electric push rod 2131, an electric cylinder connector 2132, a push rod connecting pin 2133, and a push rod hinge seat 2134. The electric push rod 2131 is vertically disposed within a lifting groove 239 at the bottom of the lower trough side 232. The housing of the electric push rod 2131 is connected to the lower trough side 232 via the electric cylinder connector 2132. The end of the telescopic rod of the electric push rod 2131 is rotatably connected to the upper part of the push rod hinge seat 2134 via the push rod connecting pin 2133. The push rod hinge seat 2134 is mounted on the upper surface of the bottom plate 221. Other components and connections are the same as in specific embodiments one, two, three, four, or five.

[0046] Specific implementation method seven: Combination Figures 1 to 14 This embodiment describes the roller unit 313, which includes a roller mounting block 3131, two main roller seats 3132, two main roller shafts 3133, four main rollers 3134, four limiting sleeves 3135, and four roller locking nuts 3136. The roller mounting block 3131 is a cuboid block structure. A horizontally arranged scraper shaft mounting hole is machined at the center of the end face of the roller mounting block 3131, and a scraper shaft 311 is inserted into the scraper shaft mounting hole. Two main roller seats 3132 are respectively mounted on the upper and lower end faces of the roller mounting block 3131. 2. The main wheel base 3132 is arranged in a back-to-back configuration. A horizontally arranged main wheel mounting shaft hole is machined on the main wheel base 3132, into which a main wheel shaft 3133 is inserted. Two main wheels 3134 are coaxially arranged on the left and right sides of the main wheel base 3132, respectively. The two main wheels 3134 are rotatably mounted on both ends of the main wheel shaft 3133. A limiting sleeve 3135 is provided between the inner side of each main wheel 3134 and the main wheel base 3132, and a roller locking nut 3136 is provided on the outer side of each main wheel 3134. The roller locking nut 3136 is threadedly connected to the end of the main wheel shaft 3133. With this configuration, the main wheel mounting shaft hole on the main wheel base 3132 is rotatably connected to the main wheel shaft 3133. By rotating the handle 314, the tilt angle of the scraper 411 mounted on the scraper shaft 311 can be adjusted. When the scraper 411 tilt angle is adjusted to a suitable position, the scraper shaft 311 and the main wheel seat 3132 are locked and fixed by screwing in the bushing locking member 312. Other components and connections are the same as in specific embodiments one, two, three, four, five or six.

[0047] In this embodiment, a locking threaded hole 31311 is provided on the upper end face of the roller mounting block 3131 in the vertical direction. The locking threaded hole 31311 is arranged in a vertical connection with the scraper shaft mounting hole. The bushing locking member 312 is screwed in the locking threaded hole 31311, and the end of the bushing locking member 312 abuts against the outer side of the scraper shaft 311.

[0048] Specific implementation method eight: Combination Figures 1 to 14In this embodiment, the roller unit 313 further includes two auxiliary wheel units 3137. The two auxiliary wheel units 3137 are respectively disposed at the front and rear ends of the roller mounting block 3131. Each auxiliary wheel unit 3137 includes a mounting bracket 31371, an auxiliary wheel seat 31372, an auxiliary wheel axle 31373, a spring 31374, a guide rod 31375, two auxiliary wheels 31376, two limiting sleeves, and two roller locking nuts. The mounting bracket 31371 is mounted on the roller mounting block. At the end of block 3131, an auxiliary wheel seat 31372 is mounted on the lower end face of mounting bracket 31371. The auxiliary wheel seat 31372 has a vertically arranged strip-shaped groove on its side, with its left and right ends communicating with the left and right end faces of the auxiliary wheel seat 31372, respectively. A semi-circular concave surface is formed at the bottom of the strip-shaped groove. An auxiliary wheel axle 31373 is inserted into the strip-shaped groove. Two auxiliary wheels 31376 are coaxially arranged on the left and right sides of the auxiliary wheel seat 31372. 76 are rotatably mounted on both ends of the auxiliary wheel shaft 31373. A limiting sleeve is provided between the inner side of each auxiliary wheel 31376 and the auxiliary wheel seat 31372. A roller locking nut is provided on the outer side of each auxiliary wheel 31376. The roller locking nut is threadedly connected to the end of the auxiliary wheel shaft 31373. The upper end face of the mounting bracket 31371 has a guide rod through hole that communicates with the strip groove in the vertical direction. The side of the auxiliary wheel shaft 31373 has a vertically arranged guide rod connecting threaded hole. Spring 31374 is vertically positioned within the strip-shaped groove and above the auxiliary wheel shaft 31373. The guide rod connecting threaded hole is coaxially arranged with the guide rod through hole and the inner hole of spring 31374. The lower end of guide rod 31375 has external threads machined on its side. The lower end of guide rod 31375 vertically passes through the guide rod through hole and the inner hole of spring 31374 from top to bottom and is threadedly connected to the guide rod connecting threaded hole of auxiliary wheel shaft 31373. The upper end of guide rod 31375 has a hexagonal prism that matches a wrench. With this configuration, by setting two auxiliary wheel units 3137 at the front and rear ends of roller mounting block 3131, the problem of roller unit 313 tilting forward or backward while moving along the annular roller guide rail 24 can be avoided. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, or seven.

[0049] Specific Implementation Method Nine: Combining Figures 1 to 14In this embodiment, the distance between the center of the semi-circular concave surface at the bottom of the strip-shaped groove on the side of the auxiliary wheel seat 31372 and the center of the main wheel mounting shaft hole of the main wheel seat 3132 below the roller mounting block 3131 is L5, where L5 = 10-20mm. This arrangement serves two purposes: firstly, when the roller unit 313 moves to the horizontal section of the annular roller guide rail 24, the auxiliary wheel shaft 31373, under the action of the spring 31374, pushes the auxiliary wheel 31376 to apply slight pressure to the annular roller guide rail 24, thereby improving the stability of the roller unit 313; secondly, when the roller unit 313 moves to the turning point of the annular roller guide rail 24, the spring 31374 can compensate for the gap between the auxiliary wheel 31376 and the surface of the annular roller guide rail 24, also contributing to the stability of the roller unit 313. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, seven, or eight.

[0050] Specific Implementation Method Ten: Combining Figures 1 to 14 This embodiment describes a scraper unit 41 comprising a scraper 411 and multiple scraper connecting bolts 412. The scraper 411 is a rectangular plate structure. A scraper mounting groove 413 is formed on the upper end face of the scraper 411 along the height direction. Multiple first scraper connecting holes 414 are uniformly formed on the front end face of the scraper 411 along the width direction from left to right. The first scraper connecting holes 414 vertically penetrate the scraper mounting groove and are elongated holes arranged along the length direction of the scraper. Multiple second scraper connecting holes 3111 are formed radially in the middle of the scraper shaft 311. The multiple second scraper connecting holes 3111 correspond one-to-one with the multiple first scraper connecting holes 414. The scraper shaft 311 is horizontally installed in the scraper mounting groove 413 on the upper part of the scraper 411. The scraper shaft 311 is detachably connected to the scraper 411 by multiple scraper connecting bolts 412. This configuration, with a scraper mounting groove 413 on the upper part of the scraper 411, allows for fine-tuning of the height of the scraper 411. Simultaneously, an elongated hole communicating with the scraper mounting groove is provided on the front end face of the scraper 411, thus accommodating the relative position between the scraper 411 and the scraper shaft 311. Other components and connections are the same as in embodiments one, two, three, four, five, six, seven, eight, or nine.

[0051] Working principle

[0052] Combination Figures 1 to 14 Explanation of the working principle of the coal mine scraper conveyor of the present invention:

[0053] First, adjust the scraper tilt angle according to the actual operating conditions:

[0054] Manually rotate the handle sequentially to rotate the main wheel shaft, thereby adjusting the scraper inclination angle mounted on the scraper shaft. When the scraper inclination angle is adjusted to the appropriate position, screw in the bushing locking device to lock and fix the scraper shaft and the main wheel seat.

[0055] Then, adjust the height of the upper trough bottom plate according to the scraper tilt angle:

[0056] Once the scraper tilt angle is adjusted, start the electric push rod to raise or lower the upper trough bottom plate to the appropriate position. The lifting height of the upper trough bottom plate changes with the scraper tilt angle. The side baffle can slide up and down with the raising and lowering of the upper trough bottom plate to prevent material leakage from the side of the trough.

[0057] Finally, the machine is started to transport and unload the coal:

[0058] The motor reducer drives the transmission shaft to rotate, which in turn drives the two sprockets at the tail of the machine to rotate. The two sprockets at the tail of the machine drive the two sprockets at the head of the machine to rotate through two scraper chains. The two scraper chains drive the two sets of roller units in all roller structures to circulate along the two sets of annular roller guide rails through the scraper chain connecting frame. This causes multiple sets of scraper units to move the coal along the surface of the upper trough bottom structure until it reaches the head of the scraper conveyor to complete the unloading.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A scraper conveyor for coal mines, characterized in that: It includes a frame (1), a trough assembly (2), a roller assembly (3), a scraper assembly (4), and a transmission assembly (5). The trough assembly (2) is mounted on the frame (1). The trough assembly (2) includes an upper trough bottom structure (21), a lower trough bottom structure (22), and two trough side structures (23). The upper trough bottom structure (21) and the lower trough bottom structure (22) are arranged horizontally from top to bottom inside the frame (1). The two trough side structures (23) are arranged vertically opposite to each other on the left and right sides of the upper trough bottom structure (21) and the lower trough bottom structure (22) along the length of the frame (1). The upper trough bottom structure (21) has two ends. The lower bottom structure (22) is movably connected to two sidewall structures (23), and the two ends of the lower bottom structure (22) are fixedly connected to the two sidewall structures (23). Two sets of annular roller guide rails (24) are respectively provided on the two sidewall structures (23). The annular roller guide rails (24) penetrate vertically through the sidewalls of the sidewall structure (23). The roller assembly (3) includes multiple roller structures (31). The multiple roller structures (31) are arranged horizontally and equally spaced from front to back along the annular roller guide rails (24). The roller structure (31) is a single-axis double-wheel structure. The roller structure (31) includes a scraper shaft (31). 1) A bushing locking element (312), a handle (314), and two sets of roller units (313). The two sets of roller units (313) are respectively rolledly connected to two sets of annular roller guide rails (24). A horizontally arranged scraper shaft (311) is provided between the two sets of roller units (313). The two ends of the scraper shaft (311) are respectively rotatably connected to the two sets of roller units (313). A handle (314) is installed at one end of the scraper shaft (311). A bushing locking element (312) is installed on the roller unit (313). The roller unit (313) and the scraper shaft (311) are connected by the bushing locking element (312). The material scraping assembly (4) is locked and fixed. It includes multiple scraper units (41). The scraper units (41) are located between two sidewall structures (23). The multiple scraper units (41) are respectively installed on the scraper shafts (311) of multiple roller structures (31). The transmission assembly (5) is connected to the roller units (313) in all roller structures (31). The transmission assembly (5) simultaneously drives multiple roller structures (31) to circulate along the annular roller guide rail (24), so that the multiple scraper units (41) drive the coal to move along the surface of the upper bottom structure (21) until it reaches the head of the scraper conveyor to complete the unloading.

2. The coal mine scraper conveyor according to claim 1, characterized in that: The transmission assembly (5) includes a motor reducer (51), two scraper chains (52), two sets of sprocket drive units (53), and multiple scraper chain connecting frames (54). The two sets of sprocket drive units (53) are located at the head and tail of the scraper conveyor, respectively. The sprocket drive unit (53) includes a drive shaft (531) and two sprockets (532). The drive shaft (531) is horizontally arranged between the upper trough bottom structure (21) and the lower trough bottom structure (22). The two sprockets (532) are vertically arranged opposite each other on the outside of the two trough side structures (23). The two ends of the drive shaft (531) pass through the two trough side structures (23) and the two sprockets (532) from the outside to the inside and are coaxially connected to the frame (1) for rotational connection. The motor reducer ( 51) Located on one side of the drive shaft (531), the motor reducer (51) is installed on the outer wall of the corresponding groove structure (23). The shaft of the motor reducer (51) is connected to one end of the drive shaft (531). Both sprockets (532) are fixedly connected to the drive shaft (531) by a flat key. Two sprockets (532) in one set of sprocket drive units (53) are connected to two sprockets (532) in another set of sprocket drive units (53) by two scraper chains (52). Two scraper chain connecting frames (54) are installed on the outer ends of the two sets of roller units (313) in each roller structure (31). The ends of all scraper chain connecting frames (54) are fixedly connected to the chain links (521) in the corresponding sprockets (532).

3. A scraper conveyor for coal mines according to claim 2, characterized in that: A circular chain groove (5321) is radially formed at the center of the outer side of the sprocket (532). A semi-circular groove (5322) is machined at the bottom of the circular chain groove (5321). The diameter of the semi-circular groove (5322) is equal to the diameter of the chain link (521) in the scraper chain. Guide chain inclined surfaces (5323) are machined on both sides of the upper part of the circular chain groove (5321). The angle between the guide chain inclined surface (5323) and the vertical plane is α, where α = 5-25°. The distance between the tops of the guide chain inclined surfaces (5323) on both sides is L1. The diameter of the chain link (521) in the scraper chain is less than L1. (532) The outer side is machined with steps symmetrically distributed on both sides of the annular chain groove (5321). The transverse step surface (5324) of the step is a horizontal plane, and the longitudinal step surface (5325) of the step is an inclined plane. The included angle between the transverse step surface (5324) and the longitudinal step surface (5325) is β, β = 100-120°. The distance between the middle of the two rods in the chain link (521) of the scraper chain is L2. The distance between the bottom of the longitudinal steps in the steps on both sides is L3, L2 < L3. The distance between the top of the longitudinal steps in the steps on both sides is L4, L4 < L2.

4. A scraper conveyor for coal mines according to claim 3, characterized in that: The trough structure (23) includes an upper trough side 1 (231), a lower trough side 1 (232), an upper trough side 2 (233), a lower trough side 2 (234), four end trough sides (235), multiple trough side crossbeams (236), multiple wheel baffles 1 (237) and multiple wheel baffles 2 (238). The upper trough side 1 (231) and the lower trough side 1 (232) are arranged horizontally along the length of the scraper conveyor from top to bottom. The upper end of the upper trough side 1 (231) and the outer side wall of the lower trough side 1 (232) are connected to the frame (1) through multiple trough side crossbeams (236). The lower end face of the upper trough side 1 (231) and the middle part of the upper end face of the upper trough side 1 (231) are provided with wheel limiting bosses 1 along the length direction. The two wheel limiting bosses 1 are cross-sections All surfaces are isosceles trapezoids and arranged axially symmetrically. The lower end face of the first trough (232) is provided with multiple vertically arranged lifting grooves (239) evenly arranged from front to back along the length direction. A rectangular hollow area (2310) is formed between the first upper trough (231) and the first lower trough (232). The second lower trough (234) and the second upper trough (233) are arranged horizontally from top to bottom along the length direction of the scraper conveyor. The lower end of the second upper trough (233) and the outer wall of the second lower trough (234) are connected to the frame (1) through multiple trough beams (236). The lower end face of the second lower trough (234) and the upper end face of the second upper trough (233) are provided with wheel limiting bosses II along the length direction in the middle of the lower end face of the second lower trough (234) and the upper end face of the second upper trough (233). The cross-sections of the two wheel limiting bosses II are both The structure is an isosceles trapezoid and axially symmetrically arranged. A rectangular hollow area 2 (2311) is formed between the lower sidewall 2 (234) and the upper sidewall 2 (233). Multiple vertically arranged baffle plates 1 (237) are installed on both sides of the lower part of the upper sidewall 1 (231) and both sides of the upper part of the lower sidewall 1 (232). An upper hollow area for installing roller units (313) is provided between the two corresponding sets of baffle plates 1 (237). Multiple vertically arranged baffle plates 2 (238) are installed on both sides of the lower sidewall 2 (234) and both sides of the upper sidewall 2 (233). A lower hollow area for installing roller units (313) is provided between the two corresponding sets of baffle plates 2 (238). Each sidewall structure (23) is front The rear ends are provided with two vertically arranged end grooves (235). The end grooves (235) include an inner groove (2351), an outer groove (2352), and multiple baffle plates (2353). Both the inner groove (2351) and the outer groove (2352) are semi-circular ring structures. The inner groove (2351) and the outer groove (2352) are arranged coaxially from the outside to the inside. The two ends of the inner groove (2351) are connected to the ends of the first upper groove (231) and the second upper groove (233) respectively. The two ends of the outer groove (2352) are connected to the ends of the first lower groove (232) and the second lower groove (234) respectively. A semi-circular hollow area (2312) is formed between the inner groove (2351) and the outer groove (2352).A rectangular hollow area 1 (2310), a rectangular hollow area 2 (2311), and semi-circular hollow areas on the front and rear sides (2312) form an annular roller guide rail (24). A wheel limiting boss 3 is provided at the center of the outer side of the inner groove (2351) along the circumferential direction, and a wheel limiting boss 4 is provided at the center of the inner side of the outer groove (2352) along the circumferential direction. Both wheel limiting boss 3 and wheel limiting boss 4 have isosceles trapezoidal cross sections, and wheel limiting boss 1 and wheel limiting boss 2 correspond to each other. Multiple vertically arranged baffle plates (2353) are installed on both the outer sides of the inner groove (2351) and the inner sides of the outer groove (2352). Between the two corresponding sets of baffle plates (2353), an end hollow area is formed for installing the roller unit (313).

5. A scraper conveyor for coal mines according to claim 4, characterized in that: The lower trough bottom structure (22) includes a lower trough bottom plate (221), which is horizontally arranged above two lower trough sides (234) along the length of the scraper conveyor. The lower end face of the lower trough bottom plate (221) is fixedly connected to the upper end face of the two lower trough sides (234) on both sides. The upper trough bottom structure (21) includes an upper trough bottom plate (211), two sets of side baffles (212), multiple trough bottom plate lifting mechanisms (213), and multiple limit blocks (214). Vertically arranged trough bottom plate lifting mechanisms (213) are installed in the lifting grooves (239) at the bottom of the two lower trough sides (232). The upper trough bottom plate (211) is horizontally arranged below the two lower trough sides (232) along the length of the scraper conveyor. The upper end face of the upper trough bottom plate (211) is connected to the extended ends of several trough bottom plate lifting mechanisms (213) on both sides. 232) A rectangular baffle groove (2321) is machined on the inner side. The bottom of the rectangular baffle groove (2321) is connected to the lower end face of the lower groove side (232). A plurality of limiting blocks (214) are evenly arranged from left to right along the length direction of the rectangular baffle groove (2321). The limiting blocks (214) are rectangular limiting blocks. The side baffles (212) are rectangular plate structures. The two sets of side baffles (212) are arranged from bottom to top. The upper part can be slidably inserted into the rectangular baffle groove (2321) inside the two lower groove side (232). The upper end face of the side baffle (212) is provided with baffle slide grooves (2121) evenly arranged from left to right along the length direction. The baffle slide groove (2121) is a rectangular groove. Multiple baffle slide grooves (2121) correspond one-to-one with multiple rectangular limiting blocks. The rectangular limiting blocks can be slidably inserted into the baffle slide groove (2121).

6. A scraper conveyor for coal mines according to claim 5, characterized in that: The bottom plate lifting mechanism (213) includes an electric push rod (2131), an electric cylinder connector (2132), a push rod connecting pin (2133), and a push rod hinge seat (2134). The electric push rod (2131) is vertically installed in the lifting groove (239) at the bottom of the lower trough side (232). The housing of the electric push rod (2131) is connected to the lower trough side (232) through the electric cylinder connector (2132). The end of the telescopic rod of the electric push rod (2131) is rotatably connected to the upper part of the push rod hinge seat (2134) through the push rod connecting pin (2133). The push rod hinge seat (2134) is installed on the upper surface of the bottom plate (221).

7. A scraper conveyor for coal mines according to claim 6, characterized in that: The roller unit (313) includes a roller mounting block (3131), two main roller seats (3132), two main roller shafts (3133), four main rollers (3134), four limiting sleeves (3135), and four roller locking nuts (3136). The roller mounting block (3131) is a cuboid block structure. A horizontally arranged scraper shaft mounting hole is machined at the center of the end face of the roller mounting block (3131). A scraper shaft (311) is inserted into the scraper shaft mounting hole. Two main roller seats (3132) are respectively mounted on the upper and lower end faces of the roller mounting block (3131). The two main roller seats (3132) are arranged back to back. The wheel seat (3132) is machined with a horizontally arranged main wheel mounting shaft hole. The main wheel shaft (3133) is inserted into the main wheel mounting shaft hole. Two main wheels (3134) are arranged coaxially on the left and right sides of the main wheel seat (3132). The two main wheels (3134) are rotatably fitted on both ends of the main wheel shaft (3133). A limiting sleeve (3135) is provided between the inner side of each main wheel (3134) and the main wheel seat (3132). A roller locking nut (3136) is provided on the outer side of each main wheel (3134). The roller locking nut (3136) is threadedly connected to the end of the main wheel shaft (3133).

8. A scraper conveyor for coal mines according to claim 7, characterized in that: The roller unit (313) also includes two auxiliary wheel units (3137), which are respectively disposed at the front and rear ends of the roller mounting block (3131). Each auxiliary wheel unit (3137) includes a mounting bracket (31371), an auxiliary wheel seat (31372), an auxiliary wheel axle (31373), a spring (31374), a guide rod (31375), two auxiliary wheels (31376), two limit sleeves, and two roller locking nuts. The mounting bracket (31371) is mounted on the roller mounting block (3131). 1) At the end, an auxiliary wheel seat (31372) is mounted on the lower end face of the mounting bracket (31371). A vertically arranged strip-shaped groove is formed on the side of the auxiliary wheel seat (31372). The left and right ends of the strip-shaped groove are respectively connected to the left and right end faces of the auxiliary wheel seat (31372). A semi-circular concave surface is formed at the bottom of the strip-shaped groove. An auxiliary wheel axle (31373) is inserted into the strip-shaped groove. Two auxiliary wheels (31376) are coaxially arranged on the left and right sides of the auxiliary wheel seat (31372). The two auxiliary wheels (31376)... Each auxiliary wheel (31376) is rotatably mounted on both ends of the auxiliary wheel shaft (31373). A limiting sleeve is provided between the inner side of each auxiliary wheel (31376) and the auxiliary wheel seat (31372). A roller locking nut is provided on the outer side of each auxiliary wheel (31376). The roller locking nut is threadedly connected to the end of the auxiliary wheel shaft (31373). A guide rod through hole, communicating with the strip-shaped through groove, is provided on the upper surface of the mounting bracket (31371). A vertically arranged guide rod connecting threaded hole is provided on the side of the auxiliary wheel shaft (31373). The spring (31374) is vertically arranged in the strip groove and located above the auxiliary wheel shaft (31373). The guide rod connecting threaded hole is coaxially arranged with the guide rod through hole and the inner hole of the spring (31374). The lower end of the guide rod (31375) is machined with external threads. The lower end of the guide rod (31375) passes vertically through the guide rod through hole and the inner hole of the spring (31374) from top to bottom and is threadedly connected to the guide rod connecting threaded hole of the auxiliary wheel shaft (31373). The upper end of the guide rod (31375) is machined with a hexagonal prism that matches the wrench.

9. A scraper conveyor for coal mines according to claim 8, characterized in that: The distance between the center of the semi-circular concave surface at the bottom of the strip groove on the side of the auxiliary wheel seat (31372) and the center of the main wheel mounting shaft hole of the main wheel seat (3132) below the roller mounting block (3131) is L5, where L5 = 10-20mm.

10. A scraper conveyor for coal mines according to claim 9, characterized in that: The scraper unit (41) includes a scraper (411) and multiple scraper connecting bolts (412). The scraper (411) has a rectangular plate structure. A scraper mounting groove (413) is provided on the upper end face of the scraper (411) along the height direction. Multiple first scraper connecting holes (414) are evenly provided on the front end face of the scraper (411) along the width direction from left to right. The first scraper connecting holes (414) penetrate vertically through the scraper mounting groove. The scraper shaft (311) has a plurality of second scraper connecting holes (3111) arranged radially in the middle of the scraper shaft (3111). The plurality of second scraper connecting holes (3111) correspond one-to-one with the plurality of first scraper connecting holes (414). The scraper shaft (311) is horizontally installed in the scraper mounting through groove (413) on the upper part of the scraper (411). The scraper shaft (311) is detachably connected to the scraper (411) by a plurality of scraper connecting bolts (412).

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