Heavy-load towed pit feeding conveyor

Abstract

The invention discloses a heavy-load dragging type pit feeding conveyor, and relates to the technical field of conveyors, the heavy-load dragging type pit feeding conveyor comprises a pit, a conveying mechanism is arranged in the pit, and one side of the conveying mechanism is connected with an automatic tensioning mechanism; the conveying mechanism comprises two sets of symmetrically-arranged supporting frames, one set of supporting frames slide on one side in the pit, and the other set of supporting frames are fixedly connected to the other side in the pit. According to the invention, an automatic tensioning mechanism and a manual tensioning mechanism are combined. The automatic tensioning mechanism can automatically adjust the tensioning force of the high-strength tear-resistant conveying belt in real time according to the tensioning state of the conveying belt through the gravity action of a tensioning heavy block, it is guaranteed that the conveying belt is in the optimal tensioning state all the time, and the problems of slipping and excessive abrasion are effectively avoided. The manual tensioning mechanism can synchronously and accurately adjust the tensioning force at the two ends of the conveying belt under equipment debugging or special working conditions, and the applicability and operation flexibility of the equipment are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of conveyors, in particular to a heavy-load drag-type pit feeding conveyor. Background Art

[0002] In industries such as mining, port freight, and large-scale material handling, heavy-duty drag-type pit feeder conveyors serve as essential material handling equipment, carrying large quantities of bulk materials from surface storage to subsequent processing or transportation. The continuous expansion of industrial production has placed higher demands on the efficiency, stability, and reliability of material handling equipment. Pit feeder conveyors, through their pit structure, effectively utilize space and achieve efficient, centralized material transportation, playing a vital role in improving the continuity of the overall production process.

[0003] Traditional pit feeder conveyors have drawbacks in their belt tensioning systems. Most use a single, fixed tensioning system, making it difficult to adjust the tension adaptively as material accumulates on the belt. This can easily lead to the belt being too loose, causing slippage, impacting material conveying efficiency and even causing material spillage. Alternatively, if the belt is too tight, it can increase belt wear, shortening its service life, placing significant load on transmission components, and reducing overall operational stability. Summary of the Invention

[0004] The object of the present invention is to provide a heavy-load drag-type pit feeding conveyor to solve the problems existing in the above-mentioned background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A heavy-load drag-type pit feeding conveyor comprises a pit, a conveying mechanism is arranged in the pit, and an automatic tensioning mechanism is connected to one side of the conveying mechanism; The conveying mechanism includes two groups of symmetrically arranged support frames, wherein one group of support frames slides on one side of the pit and the other group of support frames is fixed on the other side of the pit; The two groups of support frames are both rotatably mounted with anti-skid transmission wheels, and the two groups of anti-skid transmission wheels are connected to high-strength tear-resistant conveyor belts; The automatic tensioning mechanism includes a connecting ring fixed to one end of one set of support frames sliding in the pit; A steel wire rope is fixed to one side of the connecting ring and passes around the outer circle of the auxiliary pulley 1 and the positioning plate 2; The restraining cabin is fixed in the pit and is slidably connected to a tensioning weight fixed to the other end of the wire rope; The tensioning weight is pulled downward along the inside of the restriction cabin by gravity, and the tensioning weight pulls the steel wire rope and the connecting ring. The connecting ring moves with one group of support frames and the anti-skid transmission wheel to achieve tensioning of the high-strength tear-resistant conveyor belt.

[0006] As a further solution of the present invention: the conveying mechanism further includes a guide post fixedly connected to a chute in the pit; A slider slides on the surface of the guide post and is fixed to the bottom of one set of support frames; A sliding block slides on both sides of the support frame and has a support plate fixed on its surface; The limit pin passes through the sliding block and the support frame to achieve the docking between the support frame and the sliding block; A transmission shaft rotatably connected to the middle portion of the support plate and fixedly connected to the middle portion of the anti-skid transmission wheel; The motor is fixedly connected to the middle part of one side of the support plate on the other set of support frames, and the output end is fixedly connected to one end of the transmission shaft.

[0007] As a further solution of the present invention: the automatic tensioning mechanism further includes a positioning plate 1, which is fixed in the pit and rotatably connected to an auxiliary pulley 1 in the middle; Positioning plate 2, fixed to both sides of the top of the restriction cabin and rotatably connected to auxiliary pulley 2 in the middle; There are two sets of limit columns, both of which are slidably connected to the slide grooves on both sides of the limit cabin; The moving block is slidably connected to the surface of the limiting column and fixed to one end of the tensioning weight block.

[0008] As a further solution of the present invention: the conveying mechanism is connected to a manual tensioning mechanism to achieve synchronous tensioning of both ends of the high-strength tear-resistant conveyor belt.

[0009] As a further solution of the present invention: the manual tensioning mechanism includes two sets of limit rods, which are respectively fixed to both sides of the middle of the two sets of support frames; There are two sets of threaded columns that are symmetrically arranged and are both rotatably connected to the middle parts of the two sets of limit rods; A docking post, fixedly connected to one end of one set of threaded posts; A docking sleeve, fixed to the middle of another set of threaded columns; Two groups of fixing rods are provided and are respectively threadedly connected to the surfaces of the two groups of threaded columns and fixed to the inner sides of the two connected sliding blocks.

[0010] As a further solution of the present invention: the other end of the threaded column connected to the docking column is fixedly connected to a turntable; The docking post slides in the docking tube; Guide blocks are fixedly connected to both sides of the docking column, and the guide blocks slide in the sliding grooves provided on both sides of the docking tube.

[0011] As a further solution of the present invention: a plurality of symmetrically arranged positioning frames are fixedly connected in the pit, and two symmetrically arranged positioning frames are fixedly connected by a connecting column; at the same time, a shock-resistant buffer roller group is fixedly connected to the middle of the two symmetrically arranged positioning frames to buffer when materials fall; The impact-resistant buffer roller group is arranged in the middle of the high-strength tear-resistant conveyor belt; The connecting column is arranged on the outer side of the bottom of the high-strength tear-resistant conveyor belt.

[0012] As a further solution of the present invention: one side of the pit is connected to a ground yard, a forklift is provided on the ground yard for pushing materials into the pit, connecting hoppers are fixedly connected at both ends of the pit opening, and a combing mechanism is provided on the surface of the pit.

[0013] As a further solution of the present invention: the combing mechanism includes docking blocks, which are provided in two groups and fixed on both sides of the pit; A connecting rod, fixedly connected to the tops of the two sets of docking blocks; A support rod is slidably connected to the docking block; The limiting block is fixed in the connecting rod and the middle part is rotatably connected to the worm; A worm wheel is meshed with the worm and fixed at its middle with a screw that is rotatably connected to the connecting rod and the middle of the docking block; a knob fixed to one end of the worm gear and rotatably connected to one side of the connecting rod; The support rod is threadedly connected to the surface of the screw rod.

[0014] As a further solution of the present invention: the combing mechanism further includes a combing bracket fixed to the other end of the support rod; The extension rod slides in the slide grooves on both sides of the combing bracket; A guide slide column is fixedly connected to a slide groove in the combing bracket; A spring is sleeved on the periphery of the guide slide and fixed between the combing support and the extension rod; A triangular block is fixed to the other end of the extension rod and fits on the inner side of the support rod; The extension rod slides on the surface of the guide slide column.

[0015] Beneficial effects of the present invention: (1) The present invention combines an automatic tensioning mechanism with a manual tensioning mechanism. The automatic tensioning mechanism, through the gravity of the tensioning weight, can automatically adjust the tension of the high-strength tear-resistant conveyor belt in real time according to the tension state of the conveyor belt, ensuring that the conveyor belt is always in the optimal tension state, effectively avoiding slippage and excessive wear problems; the manual tensioning mechanism can achieve synchronous and precise adjustment of the tension force at both ends of the conveyor belt during equipment debugging or special working conditions, thereby enhancing the applicability and operational flexibility of the equipment; (2) The design of the combing mechanism can effectively comb and limit the material during the conveying process. The height of the support rod and the combing bracket can be adjusted by adjusting the worm, worm wheel and screw through the knob to meet the material conveying height requirements under different working conditions. At the same time, the adaptive adjustment structure composed of the spring, extension rod and triangular block in the combing bracket can make the triangular block always fit the inner inclined surface of the connecting hopper to prevent the material from flowing out of the gap, thereby ensuring the uniformity and stability of material conveying and improving the conveying accuracy and working efficiency of the equipment. (3) Multiple symmetrically distributed positioning frames are set up in the pit and fixedly connected by connecting columns. An impact-resistant buffer roller group is installed in the middle of the positioning frames. The roller group uses three rubber buffer rollers connected in a V-shaped distribution. It can provide a good buffering effect when the material falls, reduce the impact force of the material on the conveyor belt, extend the service life of the conveyor belt, and also reduce the situation of material splashing, improve the working environment, and reduce the cost of cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of feeding of the present invention; Figure 3 This is a schematic diagram of the local structure of the present invention Figure 1 ; Figure 4 This is a schematic diagram of the local structure of the present invention Figure 2 ; Figure 5 It is a schematic diagram of the local structure of the conveying mechanism in the present invention; Figure 6 It is a schematic cross-sectional view of the dynamic tensioning mechanism of the present invention; Figure 7 It is a partial structural diagram of the manual tensioning mechanism of the present invention; Figure 8 This is a schematic diagram of the local structure of the present invention Figure 3 ; Figure 9 It is a schematic cross-sectional structure diagram of the combing mechanism in the present invention; Figure 10 yes Figure 9 Enlarged view of point A in the middle.

[0018] In the figure: 1. pit; 2. conveying mechanism; 20. support frame; 21. support plate; 22. anti-skid transmission wheel; 23. motor; 24. sliding block; 25. limit pin; 26. transmission shaft; 27. slider; 28. guide column; 29. ​​high-strength tear-resistant conveyor belt; 3. automatic tensioning mechanism; 30. connecting ring; 31. wire rope; 32. positioning plate 1; 33. auxiliary pulley 1; 34. positioning plate 2; 35. auxiliary pulley 2; 36. limiting cabin; 37. tensioning weight; 38. moving block; 39. limit column; 4. manual tensioning mechanism; 40. turntable; 41. Docking column; 42. Docking tube; 43. Guide block; 44. Limit rod; 45. Fixing rod; 46. Threaded column; 5. Connecting hopper; 6. Positioning frame; 7. Combing mechanism; 700. Combing bracket; 701. Extension rod; 702. Triangular block; 703. Guide column; 704. Spring; 705. Support rod; 706. Docking block; 707. Connecting rod; 708. Worm; 709. Limit block; 710. Worm gear; 711. Knob; 712. Screw; 8. Connecting column; 9. Impact-resistant buffer roller group; 10. Ground yard; 11. Forklift. DETAILED DESCRIPTION

[0019] 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 any creative efforts shall fall within the scope of protection of the present invention.

[0020] Example 1 See also Figures 1-10 As shown, the present invention is a heavy-load drag-type pit feeding conveyor, comprising a pit 1, a conveying mechanism 2 is provided in the pit 1, and an automatic tensioning mechanism 3 is connected to one side of the conveying mechanism 2; The conveying mechanism 2 includes two sets of symmetrically arranged support frames 20, wherein one set of support frames 20 slides on one side of the pit 1 and the other set of support frames 20 is fixed on the other side of the pit 1; The two sets of support frames 20 are both rotatably mounted with anti-skid transmission wheels 22, and the two sets of anti-skid transmission wheels 22 are transmission-connected with high-strength tear-resistant conveyor belts 29; The automatic tensioning mechanism 3 includes a connecting ring 30 fixed to one end of one set of support frames 20 sliding in the pit 1; The steel wire rope 31 is fixed to one side of the connecting ring 30 and passes around the outer circumference of the auxiliary pulley 1 33 and the positioning plate 2 34; The confinement cabin 36 is fixed in the pit 1 and is slidably connected to a tensioning weight 37 fixed to the other end of the wire rope 31; The tensioning weight 37 is pulled downward along the inside of the restriction cabin 36 by gravity, and the tensioning weight 37 pulls the wire rope 31 and the connecting ring 30. The connecting ring 30 moves with one group of support frames 20 and the anti-skid transmission wheel 22 to achieve tensioning of the high-strength tear-resistant conveyor belt 29.

[0021] It should be noted that the steel wire rope 31, auxiliary pulley 1 33, and positioning plate 2 34 are provided with two sets to ensure synchronization when the tensioning weight 37 moves on both sides; The tensioning weight 37 is made of lead material, which makes the downward pulling force of the tensioning weight 37 stronger; The arrangement of the limiting compartment 36 can prevent the tensioning weight 37 from sliding out and falling off.

[0022] In the present invention, preferably, the conveying mechanism 2 further includes a guide post 28 fixedly connected to a chute in the pit 1; The slider 27 slides on the surface of the guide post 28 and is fixed to the bottom of one set of support frames 20; Sliding blocks 24 slide on both sides of the support frame 20 and have support plates 21 fixed to their surfaces; The limiting pin 25 passes through the sliding block 24 and the support frame 20 to achieve docking between the support frame 20 and the sliding block 24; The transmission shaft 26 is rotatably connected to the middle portion of the support plate 21 and fixed to the middle portion of the anti-skid transmission wheel 22; The motor 23 is fixed to the middle of one side of the support plate 21 on the other support frame 20 and the output end is fixed to one end of the transmission shaft 26 .

[0023] It should be noted that there are two sets of guide posts 28 and sliders 27 and they are symmetrically arranged to ensure that the two sides of a set of support frames 20 connected thereto move synchronously; The middle of the support frame 20 and the sliding block 24 are both provided with a docking groove, which is convenient for the limit pin 25 to pass through so that the sliding block 24 is fixed to the surface of the support frame 20 to prevent the support frame 20 from sliding along; One side of the other set of support frames 20 is fixed with an inclined material guide plate to facilitate guiding the materials transported to the end.

[0024] In the present invention, preferably, the automatic tensioning mechanism 3 further includes a positioning plate 32 fixed in the pit 1 and rotatably connected to an auxiliary pulley 33 in the middle; Positioning plate 2 34 is fixed to both sides of the top of the limiting cabin 36 and is rotatably connected to auxiliary pulley 2 35 in the middle; There are two sets of limiting posts 39, both of which are slidably connected to the slide grooves on both sides of the limiting compartment 36; The moving block 38 is slidably connected to the surface of the limiting column 39 and fixed to one end of the tensioning weight 37 .

[0025] During the implementation process, when the material is pushed into the pit 1 by the forklift 11 and falls on the surface of the high-strength tear-resistant conveyor belt 29, the high-strength tear-resistant conveyor belt 29 is pressed into a shape that matches the impact-resistant buffer roller group 9. At this time, the tension of the high-strength tear-resistant conveyor belt 29 is affected, which can easily cause loose transmission. When the tension of the high-strength tear-resistant conveyor belt 29 is too loose, the tensioning weight 37 moves downward along the moving block 38 along the limit column 39 and the chute inside the limit cabin 36 under gravity, and the tensioning weight 37 pulls the wire rope 31, and the wire rope 31 passes through the auxiliary pulley 2 35 and the auxiliary pulley 33 assist in pulling the connecting ring 30 connected to one group of support frames 20, and one group of support frames 20 moves outward along the guide column 28 and the slide groove opened in the pit 1 through the slider 27. The support frame 20 moves outward with the support plate 21 and the sliding block 24 connected together by the limit pin 25, and the support plate 21 moves outward with one group of transmission shafts 26 and the anti-skid transmission wheel 22. One group of anti-skid transmission wheels 22 moves outward to tighten the high-strength tear-resistant conveyor belt 29, so that the high-strength tear-resistant conveyor belt 29 can be adaptively tightened; A motor 23 is provided, and the output end of the motor 23 drives one set of anti-skid transmission wheels 22 to rotate, and one set of anti-skid transmission wheels 22 drives the high-strength tear-resistant conveyor belt 29 to rotate with the other set of anti-skid transmission wheels 22, so that the high-strength tear-resistant conveyor belt 29 transports the material forward along the direction of rotation of the anti-skid transmission wheels 22.

[0026] Example 2 In the present invention, preferably, a manual tensioning mechanism 4 is connected to the conveying mechanism 2 to achieve synchronous tensioning of both ends of the high-strength tear-resistant conveyor belt 29 .

[0027] In the present invention, preferably, the manual tensioning mechanism 4 includes a limit rod 44, which is provided with two groups fixed to both sides of the middle of the two groups of support frames 20; The threaded posts 46 are provided in two groups and are symmetrically arranged and are both rotatably connected to the middle portions of the two groups of limiting rods 44; The docking post 41 is fixed to one end of one set of threaded posts 46; The docking sleeve 42 is fixed to the middle part of another set of threaded posts 46; The fixing rods 45 are provided in two groups and are respectively threadedly connected to the surfaces of the two groups of threaded columns 46 and fixed to the inner sides of the two connected sliding blocks 24 .

[0028] It should be noted that the threads on the two sets of threaded columns 46 are arranged in opposite directions, so that the two sets of fixing rods 45 move relative to each other while moving.

[0029] In the present invention, preferably, the other end of the threaded column 46 connected to the docking column 41 is fixedly connected to the turntable 40; The docking post 41 slides in the docking tube 42; Guide blocks 43 are fixedly connected to both sides of the docking column 41 , and the guide blocks 43 slide in the sliding grooves formed on both sides of the docking tube 42 .

[0030] It should be noted that the provision of the guide block 43 can effectively guide the docking column 41 when it slides.

[0031] During the implementation process, when one of the support frames 20 moves outward, it brings with it a set of limit rods 44 and docking posts 41 connected thereto, along the guide blocks 43 on both sides, along the slide grooves on both sides of the docking tube 42 and moves inside to adjust the overall length, thereby preventing one of the support frames 20 from getting stuck when moving; When it is necessary to synchronously adjust the tensioning force at both ends of the high-strength tear-resistant conveyor belt 29, remove the limit pins 25 on the two sets of support frames 20, rotate the turntable 40, and the turntable 40 drives the two sets of threaded columns 46 to rotate along the middle of the limit rod 44. The threaded columns 46 drive the docking columns 41 and the guide blocks 43 to rotate, and the guide blocks 43 drive the docking tube 42 to rotate. The two sets of threaded columns 46 rotate to make the two sets of fixed rods 45 drive the sliding blocks 24 connected on both sides to move outward along the support frame 20, and the two sets of sliding blocks 24 drive the connected support plates 21 and the anti-skid transmission wheels 22 to move outward, thereby pulling the high-strength tear-resistant conveyor belt 29, thereby synchronously adjusting the tensioning force on both sides of the high-strength tear-resistant conveyor belt 29.

[0032] Example 3 In the present invention, preferably, a plurality of symmetrically arranged positioning frames 6 are fixedly connected in the pit 1, and two symmetrically arranged positioning frames 6 are fixedly connected by a connecting column 8; at the same time, the middle parts of the two symmetrically arranged positioning frames 6 are fixedly connected with an impact-resistant buffer roller group 9 for buffering when the material falls; The impact-resistant buffer roller group 9 is arranged in the middle of the high-strength tear-resistant conveyor belt 29; The connecting column 8 is arranged on the outer side of the bottom of the high-strength tear-resistant conveyor belt 29.

[0033] It should be noted that the impact-resistant buffer roller group 9 is composed of three buffer rollers connected in a V-shape, and the buffer rollers are made of rubber material and can play a certain buffering role.

[0034] In the present invention, preferably, one side of the pit 1 is connected to a ground yard 10, and a forklift 11 for pushing materials into the pit 1 is provided on the ground yard 10. Both ends of the opening of the pit 1 are fixedly connected with a connecting hopper 5, and a combing mechanism 7 is provided on the surface of the pit 1.

[0035] It should be noted that the pit 1 is set below the horizontal plane of the foundation to facilitate material transportation. A discharge port is provided at one end of the pit 1 where a guide plate is provided to facilitate the transfer of materials to the next conveying pit 1.

[0036] In the present invention, preferably, the combing mechanism 7 includes docking blocks 706, which are provided in two groups and fixed on both sides of the pit 1; Connecting rod 707, fixedly connected to the top of the two sets of docking blocks 706; Support rod 705, slidably connected to docking block 706; The limiting block 709 is fixed in the connecting rod 707 and is rotatably connected to the worm 708 in the middle; The worm wheel 710 is meshed with the worm 708 and fixed to the middle of which is a screw rod 712 that is rotatably connected to the middle of the connecting rod 707 and the docking block 706; The knob 711 is fixed to one end of the worm 708 and is rotatably connected to one side of the connecting rod 707; The support rod 705 is threadedly connected to the surface of the screw rod 712 .

[0037] It should be noted that the limiting block 709 , the worm 708 , the worm wheel 710 , and the lead screw 712 are each provided in two groups, and the two groups of worms 708 are connected by a column to maintain the stability of the transmission.

[0038] In the present invention, preferably, the combing mechanism 7 further includes a combing bracket 700, which is fixed to the other end of the support rod 705; The extension rod 701 slides in the slide grooves on both sides of the combing material support 700; The guide slide 703 is fixed in the slide groove in the combing material support 700; The spring 704 is sleeved on the outer periphery of the guide slide 703 and fixed between the combing support 700 and the extension rod 701; The triangular block 702 is fixed to the other end of the extension rod 701 and fits on the inner side of the support rod 705; The extension rod 701 slides on the surface of the guide slide post 703 .

[0039] It should be noted that the inclined surface of the triangular block 702 matches the inclined surface of the connecting hopper 5 to avoid a gap between the triangular block 702 and the connecting hopper 5, which would cause the material to flow out of the gap.

[0040] During the implementation process, the forklift 11 pushes the materials on the ground yard 10 into the pit 1 and drops them onto the surface of the high-strength tear-resistant conveyor belt 29; Turn the knob 711, which drives the worm 708 to rotate along the middle of the connecting rod 707 and the limit block 709. The worm 708 drives the worm wheel 710 to rotate. The worm wheel 710 drives the lead screw 712 to rotate along the middle of the connecting rod 707 and the docking block 706, so that the support rod 705 moves along the lead screw 712 and is stored in the docking block 706. The support rod 705 drives the combing bracket 700 to move upward, making it easier to adjust the height of the combing bracket 700 to control the height limit during material transportation. As the combing bracket 700 moves upward, the curvature of the inclined surface in contact with the connecting hopper 5 changes. The internal thrust of the combing bracket 700 is used to push the extension rod 701, and the extension rod 701 moves outward with the triangular block 702 to fit closely to the inner inclined surface of the connecting hopper 5, so that the combing bracket 700 can adaptively adjust the telescopic degree of the triangular block 702 and the extension rod 701 according to the change of the inclined surface of the connecting hopper 5, so that the triangular block 702 is always in contact with the inner inclined surface of the connecting hopper 5 to avoid gaps.

[0041] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A heavy-load drag-type pit feeding conveyor, characterized in that: It comprises a pit (1), a conveying mechanism (2) is provided in the pit (1), and an automatic tensioning mechanism (3) is connected to one side of the conveying mechanism (2); The conveying mechanism (2) includes two groups of symmetrically arranged support frames (20), wherein one group of support frames (20) slides on one side of the pit (1) and the other group of support frames (20) is fixed to the other side of the pit (1); Both sets of support frames (20) are rotatably mounted with anti-skid transmission wheels (22), and the two sets of anti-skid transmission wheels (22) are transmission-connected with high-strength tear-resistant conveyor belts (29); The automatic tensioning mechanism (3) comprises a connecting ring (30) fixedly connected to one end of a set of support frames (20) sliding in the pit (1); A steel wire rope (31) is fixed to one side of the connecting ring (30) and passes around the outer circumference of the auxiliary pulley 1 (33) and the positioning plate 2 (34); A confinement cabin (36) is fixed in the pit (1) and is internally slidably connected to a tensioning weight (37) fixed to the other end of the wire rope (31); The tensioning weight (37) is pulled downward along the interior of the restriction cabin (36) by gravity, and the tensioning weight (37) pulls the steel wire rope (31) and the connecting ring (30), and the connecting ring (30) moves with one set of support frames (20) and the anti-skid transmission wheel (22), thereby achieving tensioning of the high-strength tear-resistant conveyor belt (29).

2. A heavy-load drag-type pit feeding conveyor according to claim 1, characterized in that: The conveying mechanism (2) further includes a guide column (28) fixedly connected to a chute in the pit (1); A slider (27) slides on the surface of the guide column (28) and is fixed to the bottom of one set of support frames (20); A sliding block (24) slides on both sides of the support frame (20) and has a support plate (21) fixedly connected to its surface; A limit pin (25) passes through the sliding block (24) and the support frame (20) to achieve docking between the support frame (20) and the sliding block (24); A transmission shaft (26) is rotatably connected to the middle portion of the support plate (21) and fixed to the middle portion of the anti-skid transmission wheel (22); The motor (23) is fixedly connected to the middle part of one side of the support plate (21) on the other support frame (20) and the output end is fixedly connected to one end of the transmission shaft (26).

3. A heavy-load drag-type pit feeding conveyor according to claim 1, characterized in that: The automatic tensioning mechanism (3) further comprises a positioning plate (32) fixed in the pit (1) and rotatably connected to an auxiliary pulley (33) in the middle; Positioning plate 2 (34), fixed to both sides of the top of the limiting cabin (36) and rotatably connected to auxiliary pulley 2 (35) in the middle; Two groups of limiting columns (39) are provided and are slidably connected to the slide grooves on both sides of the limiting cabin (36); The moving block (38) is slidably connected to the surface of the limiting column (39) and fixed to one end of the tensioning weight (37).

4. A heavy-load drag-type pit feeding conveyor according to claim 1, characterized in that: The conveying mechanism (2) is connected to a manual tensioning mechanism (4) to achieve synchronous tensioning of both ends of the high-strength tear-resistant conveyor belt (29).

5. A heavy-load drag-type pit feeding conveyor according to claim 4, characterized in that: The manual tensioning mechanism (4) comprises two sets of limit rods (44) respectively fixed to two sides of the middle of the two sets of support frames (20); Two sets of threaded columns (46) are provided and are symmetrically arranged and are both rotatably connected to the middle parts of the two sets of limiting rods (44); A docking post (41) is fixedly connected to one end of one set of threaded posts (46); A docking sleeve (42) is fixed to the middle portion of another set of threaded columns (46); The fixing rod (45) is provided with two groups and is respectively threadedly connected to the surfaces of the two groups of threaded columns (46) and fixed to the inner sides of the two connected sliding blocks (24).

6. A heavy-load drag-type pit feeding conveyor according to claim 5, characterized in that: The other end of the threaded column (46) connected to the docking column (41) is fixedly connected to a turntable (40); The docking column (41) slides in the docking cylinder (42); Guide blocks (43) are fixedly connected to both sides of the docking column (41), and the guide blocks (43) slide in the sliding grooves provided on both sides of the docking cylinder (42).

7. A heavy-load drag-type pit feeding conveyor according to claim 1, characterized in that: A plurality of symmetrically arranged positioning frames (6) are fixedly connected in the pit (1), and two symmetrically arranged positioning frames (6) are fixedly connected via a connecting column (8); at the same time, a shock-resistant buffer roller group (9) is fixedly connected to the middle of the two symmetrically arranged positioning frames (6) for buffering when materials fall; The impact-resistant buffer roller group (9) is arranged in the middle of the high-strength tear-resistant conveyor belt (29); The connecting column (8) is arranged on the outside of the bottom of the high-strength tear-resistant conveyor belt (29).

8. The heavy-load drag-type pit feeding conveyor according to claim 1, characterized in that: One side of the pit (1) is connected to a ground yard (10), and a forklift (11) for pushing materials into the pit (1) is provided on the ground yard (10). Both ends of the opening of the pit (1) are fixedly connected to connecting hoppers (5), and a combing mechanism (7) is provided on the surface of the pit (1).

9. A heavy-load drag-type pit feeder conveyor according to claim 8, characterized in that: The combing mechanism (7) includes two sets of docking blocks (706) fixed on both sides of the pit (1); A connecting rod (707) is fixed to the top of the two sets of docking blocks (706); A support rod (705) is slidably connected to the docking block (706); A limit block (709) is fixedly connected to the connecting rod (707) and is rotatably connected to a worm (708) in the middle; A worm wheel (710) is meshed with the worm (708) and fixedly connected to the middle of the worm wheel (710) is a screw rod (712) that is rotatably connected to the middle of the connecting rod (707) and the docking block (706); A knob (711) is fixed to one end of the worm (708) and is rotatably connected to one side of the connecting rod (707); The support rod (705) is threadedly connected to the surface of the screw rod (712).

10. A heavy-load drag-type pit feeding conveyor according to claim 8, characterized in that: The combing mechanism (7) further includes a combing bracket (700) fixedly connected to the other end of the support rod (705); Extension rods (701) slide in the slide grooves on both sides of the combing material support (700); A guide slide (703) is fixedly connected to a slide groove in the combing material support (700); A spring (704) is sleeved on the periphery of the guide slide (703) and fixed between the combing material support (700) and the extension rod (701); The triangular block (702) is fixed to the other end of the extension rod (701) and fits on the inner side of the support rod (705); The extension rod (701) slides on the surface of the guide slide column (703).

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