Adjustable conveying belt tensioning device of belt conveyor
The adjustable conveyor belt tensioning device addresses the issue of unadjusted tensioning force by using a redirecting roller and multi-stage weight system to reduce energy consumption and extend the service life of conveyor belts.
Patent Information
- Application Number
- CN202420224583.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-01-30
AI Technical Summary
Existing conveyor belt tensioning devices lack the ability to adjust tensioning force, leading to increased running resistance, reduced service life, and unnecessary power consumption, especially during full load start-up.
An adjustable conveyor belt tensioning device with a redirecting roller, tensioning roller, electric hoist, and multi-stage tensioning weight system that allows for adjustable conveyor belt tensioning, reducing overall operating load and energy consumption.
The device adjusts conveyor belt tension to 1.3 to 1.5 times the operating tension during start-up, reducing overall load and saving energy while extending the service life of the conveyor belt and rollers.
Smart Images
Figure CN222137813U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an adjustable conveyor belt tensioning device of a belt conveyor, belonging to the technical field of belt conveyor equipment. Background Art
[0002] Belt conveyors are widely used in chemical, coal, metallurgy, building materials, electric power and light industry sectors for the transportation of various bulk materials such as granular and powdery materials as well as finished goods. During the operation of the belt conveyor, in order to prevent the conveyor belt from slipping and to adjust the verticality of the conveyor belt between the rollers so that the equipment can operate better, the tension of the conveyor belt needs to be adjusted appropriately. The vertical weight tensioning device has become the preferred tensioning device for various belt conveyors due to its simple structure, low cost and relatively high reliability. It moves up and down by its own weight according to the change of the conveyor belt tension, thereby realizing the compensation of the conveyor belt length and tension, ensuring that there is sufficient friction between the conveyor belt and the transmission roller without slipping, so that the conveyor can operate normally. However, in actual use, the conveyor belt tension at the start of the belt conveyor should be 1.3 to 1.5 times the stable operating tension. Since the existing general vertical tensioning device does not have the function of adjusting the tensioning force, in order to make the tensioning force meet the requirements of the conveyor belt tension at full load start-up, it is necessary to have the counterweight required to maintain the full load start-up, which makes the tension higher during stable operation. Therefore, it is bound to increase the running resistance of the belt conveyor, reduce the service life of the tensioning roller and the conveyor belt, and increase unnecessary power consumption. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide an adjustable conveyor belt tensioning device for a belt conveyor. The device can adjust the conveyor belt tensioning force of the belt conveyor, increase the service life of the conveyor belt, and at the same time reduce the power consumption of equipment operation, save energy and protect the environment, and have long-term economic benefits.
[0004] The technical solution to solve the above technical problems is:
[0005] The utility model discloses an adjustable conveyor belt tensioning device for a belt conveyor, which comprises a redirecting roller fixed beam, a redirecting roller seat, a redirecting roller, a tensioning roller sliding guide rod, a tensioning roller frame, a tensioning roller, an electric hoist and a multi-stage tensioning weight. The redirecting roller fixed beam is two parallel horizontal beams. The two horizontal beams are located below the conveyor belt of the belt conveyor. The length directions of the two horizontal beams are along the running direction of the conveyor belt. The two ends of the two horizontal beams are respectively connected to the building embedded parts. Two redirecting roller seats are respectively fixed on the two horizontal beams. The two redirecting rollers are placed in parallel above the two horizontal beams. The two ends of the roller shafts of the two redirecting rollers are respectively installed and connected with the redirecting roller seats on the two horizontal beams. The two tensioning roller sliding guide rods are placed vertically. The two tensioning roller sliding guide rods are respectively located at the two redirecting rollers. The upper ends of the two tensioning roller sliding guide rods are respectively welded vertically to the lower surfaces of the two horizontal beams of the redirecting roller fixed beam, and the lower ends of the two tensioning roller sliding guide rods are respectively connected to the building embedded parts, the tensioning roller is located below between the two redirecting rollers, the tensioning roller is parallel to the redirecting roller, one end of the conveyor belt passes through the upper surface of a redirecting roller downward to bypass the lower surface of the tensioning roller, and then passes through the upper surface of the other redirecting roller upward, the tensioning roller frame is located between the two tensioning roller sliding guide rods, the outer sides of the two ends of the tensioning roller frame are respectively slidably matched with the tensioning roller sliding guide rods, the two ends of the roller shaft of the tensioning roller are respectively connected to the inner sides of the two ends of the tensioning roller frame, the electric hoist is installed at the middle bottom of the tensioning roller frame, and the hook of the electric hoist is hoisted and connected with the multi-stage tensioning weight.
[0006] The above-mentioned adjustable conveyor belt tensioning device of the belt conveyor, the tensioning roller frame includes a sliding sleeve, a bearing seat plate, a bearing seat, fixing bolts, a crossbeam, and a protective cover. The two sliding sleeves are respectively a plate frame structure with a U-shaped cross-section. The U-shaped plate frames of the two sliding sleeves are sleeved on the inner sides of the sliding guide rods of the two tensioning rollers. Horizontal bearing seat plates are vertically welded on the outer walls of the bottom plates of the U-shaped plate frames of the two sliding sleeves. There are connecting holes on the bearing seat plates. The two bearing seats are respectively fixed to the bearing seat plates by fixing bolts. Bearings are installed in the bearing seats. The two ends of the roller shaft of the tensioning roller are respectively connected to the bearings of the bearing seats. The crossbeam of the tensioning roller frame is placed horizontally, and the two ends of the crossbeam are respectively welded to the lower parts of the two sliding sleeves. The protective cover is located above the tensioning roller, and the two ends of the protective cover are respectively connected to the upper ends of the two sliding sleeves.
[0007] The above-mentioned adjustable conveyor belt tensioning device of the belt conveyor, the electric hoist includes a hanger, a drum, a motor, a reducer, a wire rope, a hook, a high-precision tension sensor, and a wire rope buckle. The hanger is composed of two vertical steel plates, and the two steel plates are parallel and welded to the lower end surface of the crossbeam of the tensioning drum frame. The drum is installed between the two steel plates of the hanger, and the motor and the reducer are respectively located at both ends of the drum. The motor is connected to the input shaft of the reducer through a coupling, and the final large gear of the reducer is connected to the output shaft, and the output shaft is connected to the drum. One end of the two steel ropes is respectively fixed in the middle of the drum and wound on the drum according to the direction of the rope groove. The other ends of the two steel ropes pass through two hooks and are fixed to the lower end of the steel plate of the hanger by the wire rope buckle. The high-precision tension sensor is installed below the wire rope buckle.
[0008] The above-mentioned adjustable conveyor belt tensioning device of the belt conveyor, the multi-stage tensioning weight includes multiple counterweight boxes, the counterweight box is composed of a hanging beam, a box body, a cover plate, and a counterweight block. The hanging beam is a rectangular frame welded with steel pipes, the length direction of the hanging beam is in the horizontal direction, and the rectangular frame plane of the hanging beam is in a vertical position. The box body is a cuboid, and the box body is fixedly connected to both sides of the hanging beam. There is a movable cover plate on the upper end of the box body, and a counterweight block is placed in the box body. The two ends of the hanging beams of the multiple counterweight boxes are connected vertically in sequence by connecting steel wire ropes, and the upper end of the uppermost counterweight box is connected to the lifting ring through a hanging steel wire rope, and the lifting ring is connected to the hook at the lower end of the electric hoist.
[0009] The beneficial effects of the utility model are:
[0010] The tensioning roller of the utility model can slide on the tensioning roller sliding guide rod through the tensioning roller frame, and the tensioning roller frame can drive the electric hoist to move up and down, and the hook of the electric hoist is hoisted and connected with the multi-stage tensioning weight. When the belt conveyor is started, the multi-stage tensioning weight can provide the tensioning roller with a conveyor tension of 1.3 times to 1.5 times the operating tension; after the start-up is completed, the electric hoist slowly lowers the multi-stage vertical weight, and the counterweight box in the multi-stage vertical weight that falls to the ground loses the tension on the tensioning roller, and stops descending when the overall tension reaches the preset tension. The tensioning roller can provide the conveyor belt with appropriate operating tension, so that the overall operating load of the belt conveyor is reduced, so as to achieve the purpose of energy saving and consumption reduction.
[0011] The utility model has a simple and reasonable structure, is easy to use, has stable and reliable effects, and has extremely low operating costs. It cleverly uses an adjustable counterweight to adjust the belt tension and is the first to use vertical tensioning for belt conveyors. It has great energy-saving potential after application and is worthy of promotion and application in various industries. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the utility model;
[0013] Figure 2It is a structural schematic diagram of the tensioning roller frame;
[0014] Figure 3 This is the front view of the electric hoist;
[0015] Figure 4 This is the rear view of the electric hoist;
[0016] Figure 5 It is a connection diagram of the motor, reducer and reel;
[0017] Figure 6 It is a structural schematic diagram of a multi-stage tensioning weight;
[0018] Figure 7 It is a partial schematic diagram of a multi-stage tensioning hammer.
[0019] The markings in the figure are as follows: conveyor belt 1, redirecting roller fixed beam 2, redirecting roller seat 3, redirecting roller 4, tensioning roller sliding guide rod 5, tensioning roller frame 6, tensioning roller 7, electric hoist 8, multi-stage tensioning hammer 9, sliding sleeve 10, bearing seat plate 11, bearing seat 12, fixing bolt 13, cross beam 14, guard 15, hanger 16, reel 17, motor 18, reducer 19, input shaft 20, output shaft 21, coupling 22, wire rope 23, hook 24, wire rope buckle 25, high-precision tension sensor 26, counterweight box 27, lifting ring 28, hanging wire rope 29, connecting wire rope 30, lifting beam 31, box body 32, cover plate 33, counterweight block 34. DETAILED DESCRIPTION
[0020] The utility model is composed of a redirecting roller fixed beam 2, a redirecting roller seat 3, a redirecting roller 4, a tensioning roller sliding guide rod 5, a tensioning roller frame 6, a tensioning roller 7, an electric hoist 8, and a multi-stage tensioning hammer 9.
[0021] Figure 1 It is shown that the utility model adds a tensioning roller 7 in the middle of the return belt of the conveyor belt, and uses the tensioning roller 7 to apply tensioning force to the conveyor belt to achieve the purpose of increasing the starting tension, and the tensioning force of the tensioning roller 7 can be adjusted to reduce the tension of the conveyor belt during operation, reduce the overall operating load of the belt conveyor, and save energy and reduce consumption.
[0022] Figure 1 It is shown that in order to achieve the above-mentioned purpose, two redirecting rollers 4 are added to the return belt of the conveyor, so that the tensioning roller 7 can tighten the conveyor belt 1, and a multi-stage tensioning weight 9 is hoisted under the tensioning roller 7 to apply tensioning force to the tensioning roller 7. At the same time, an electric hoist 8 is added so that the gravity of the multi-stage tensioning weight 9 can be adjusted to adjust the tension of the conveyor belt 1 during operation.
[0023] Figure 1It is shown that a redirecting roller fixing beam 2 is arranged under the conveyor belt 1 of the belt conveyor. The redirecting roller fixing beam 2 is two parallel horizontal beams. The length direction of the horizontal beams is along the running direction of the conveyor belt 1. The two ends of the horizontal beams are respectively connected to the building embedded parts. Two redirecting roller seats 3 are respectively fixed on the two horizontal beams, and the two ends of the roller shafts of the two redirecting rollers 4 are respectively installed and connected to the redirecting roller seats 3 on the two horizontal beams.
[0024] Figure 1 It is shown that the tensioning roller 7 is located below between the two redirecting rollers 4, the tensioning roller 7 is parallel to the redirecting roller 4, and one end of the conveyor belt 1 passes through the upper surface of one redirecting roller 4, goes downward around the lower surface of the tensioning roller 7, and then passes upward through the upper surface of the other redirecting roller 4.
[0025] Figure 1 It is shown that the two tensioning roller sliding guide rods 5 are placed vertically, the two tensioning roller sliding guide rods 5 are respectively located between the two redirecting rollers 4, the upper ends of the two tensioning roller sliding guide rods 5 are respectively welded vertically to the lower surfaces of the two horizontal beams of the redirecting roller fixed beam 2, and the lower ends of the two tensioning roller sliding guide rods 5 are respectively connected to the building embedded parts.
[0026] Figure 1 It is shown that the tensioning roller frame 6 is located between the two tensioning roller sliding guide rods 5, and the outer sides of the two ends of the tensioning roller frame 6 are respectively slidably matched with the tensioning roller sliding guide rods 5. The two ends of the roller shaft of the tensioning roller 7 are respectively connected to the inner sides of the two ends of the tensioning roller frame 6.
[0027] Figure 1 , 2 It is shown that the tensioning roller frame 6 includes a sliding sleeve 10, a bearing seat plate 11, a bearing seat 12, a fixing bolt 13, a crossbeam 14, and a shield 15. The two sliding sleeves 10 are plate frame structures with U-shaped cross sections, which can be made of channel steel. The two sliding sleeves 10 are sleeved on the inner side of the two tensioning roller sliding guide rods 5. The bottom plates of the U-shaped plate frames of the two sliding sleeves 10 are respectively vertically welded with horizontal bearing seat plates 11. The bearing seat plates 11 have connecting holes. The two bearing seats 12 are respectively fixed on the bearing seat plates 11 by fixing bolts 13. Bearings are installed in the bearing seats 12. The two ends of the roller shaft of the tensioning roller 7 are respectively connected to the bearings of the bearing seats 12. The crossbeam 14 of the tensioning roller frame 6 is placed horizontally, and the two ends of the crossbeam 14 are respectively welded to the lower parts of the two sliding sleeves 10. The shield 15 is located above the tensioning roller 7, and the two ends of the shield 15 are respectively connected to the upper ends of the two sliding sleeves 10. The tensioning roller 7 can slide on the tensioning roller sliding guide rod 5 through the tensioning roller frame 6 to tighten the conveyor belt 1.
[0028] Figure 1 , 34 shows that the electric hoist 8 is installed at the middle bottom of the tensioning roller frame 6. The electric hoist 8 is hoisted and connected to the multi-stage tensioning weight 9 through the hook 24. The gravity of the multi-stage tensioning weight 9 is transmitted to the tensioning roller frame 6 and the tensioning roller 7 through the electric hoist 8, applying tension to the conveyor belt 1.
[0029] Figure 1 , 3 , 4, and 5 show that the electric hoist 8 includes a hanger 16, a drum 17, a motor 18, a reducer 19, a wire rope 23, a hook 24, a high-precision tension sensor 26, and a wire rope buckle 25. The hanger 16 is composed of two vertical steel plates, which are parallel and relatively welded on the lower end surface of the crossbeam 14 of the tensioning drum frame 6. The drum 17 is installed between the two steel plates of the hanger 16. The motor 18 and the reducer 19 are respectively located at both ends of the drum 17. The motor 18 directly drives the input shaft 20 of the reducer 19 through the coupling 22, and drives the output shaft 21 through the final large gear of the reducer 19 to drive the drum 17 to rotate. One end of the two steel wire ropes 23 is fixed in the middle of the drum 17 and wound on the drum 17 according to the direction of the rope groove. The other ends of the two steel wire ropes 23 pass through two hooks 24 and are fixed to the lower end of the steel plate of the hanger 16 by the steel wire rope buckle 26. The high-precision tension sensor 26 is installed below the steel wire rope buckle 25.
[0030] Figure 1 , 6 7 shows that the multi-stage tensioning weight 9 includes a plurality of counterweight boxes 27. The counterweight box 27 is composed of a hanging beam 31, a box body 32, a cover plate 33, and a counterweight block 34. The hanging beam 31 is a rectangular frame welded by steel pipes. The length direction of the hanging beam 31 is in the horizontal direction. The rectangular frame plane of the hanging beam 31 is located in a vertical position. The box body 32 is a rectangular parallelepiped. The box body 32 is fixedly connected to both sides of the hanging beam 31. A movable cover plate 33 is provided at the upper end of the box body 32. The counterweight block 34 is placed in the box body 32. The counterweight block 34 is made of steel plate with a standard unit weight, which is beneficial to the adjustment and calculation of the counterweight. The counterweight block 34 is evenly placed in the counterweight box 27 according to actual needs.
[0031] Figure 1 , 6 7 shows that the two ends of the hanging beams 31 of multiple counterweight boxes 27 are connected vertically in sequence through connecting wire ropes 30, and the upper end of the uppermost counterweight box 27 is connected to the lifting ring 28 through a hanging wire rope 29, and the lifting ring 28 is hung and connected to the hook 24 at the lower end of the electric hoist 8.
[0032] Figure 1 , 6 7 shows that the box body 32 and the cover plate 33 are welded by steel plates. The overall shape is concave at the bottom and convex at the top. When multiple counterweight boxes 27 fall one by one, the box bodies 32 and cover plates 33 of the upper and lower counterweight boxes 27 can be automatically superimposed and remain stable.
[0033] The use process of the utility model is as follows:
[0034] First, the tension that the tensioning roller 7 should apply to the conveyor belt 1 is calculated according to the starting tension of the conveyor belt 1. The tensioning force value includes the total weight of the tensioning roller frame 6, the tensioning roller 7, the electric hoist 8, and the multi-stage tensioning hammer 9; the weight of the multi-stage tensioning hammer 9 is deducted from the total weight.
[0035] The number of the counterweight boxes 27 for the multi-stage tensioning weight 9 is set, and the counterweight blocks 34 actually required are placed in the counterweight boxes 27;
[0036] Before the conveyor starts, start the electric hoist 8 to lift the tension roller frame 6, tension roller 7, electric hoist 8, and multi-stage tension hammer 9 off the ground. At this time, the tensioning force of the tension roller 7 on the conveyor belt 1 should be equal to the designed starting tension;
[0037] Start the conveyor. Under reasonable starting tension, the belt conveyor can be started with full counterweight.
[0038] Finally, after the start-up is completed, the electric hoist 8 slowly lowers the multi-stage tensioning hammer 9, and the counterweight box 27 that falls to the ground loses the tension of the conveyor belt tensioning device. When the overall tension reaches the operating tension of the conveyor belt 1, the electric hoist 8 stops descending, and the belt conveyor operates normally.
[0039] When the belt conveyor stops, the operator starts the electric hoist 8 to lift it upward so that the tensioning force of the tensioning roller 7 on the conveyor belt 1 reaches the designed starting tension again, preparing for the next start of the belt conveyor.
[0040] An embodiment of the present utility model is as follows:
[0041] The length of the redirection roller fixed beam 2 is 2150mm, the cross-sectional width is 100mm, and the height is 50mm;
[0042] The redirecting roller seat 3 has a length of 350 mm, a width of 100 mm and a height of 350 mm;
[0043] The length of the redirecting roller 4 is 1400 mm and the diameter is 800 mm;
[0044] The length of the tension roller sliding guide rod 5 is 8500mm and the diameter is 160mm;
[0045] The sliding sleeve 10 of the tensioning roller frame 6 has a length of 500 mm, a width of 220 mm, and a height of 1000 mm. The bearing seat plate 11 has a length of 500 mm, a width of 100 mm, and a thickness of 16 mm. The crossbeam 14 has a length of 1650 mm, a width of 180 mm, and a height of 64 mm. The shield 15 has a length of 1680 mm, a width of 500 mm, and a height of 230 mm.
[0046] The length of the tensioning roller 7 is 1400 mm and the diameter is 800 mm;
[0047] The length of the drum 17 of the electric hoist 8 is 640 mm, the diameter is 220 mm, the model of the motor 18 is DY-100L-8, the model of the reducer 19 is ZLY07, and the model of the high-precision tension sensor 26 is TLL-1-50KN;
[0048] The length of the hanging beam 31 of the counterweight box 27 is 1420mm, the width is 180mm, and the diameter is 50mm. The length of the box body 32 is 1250mm, the width is 300mm, and the height is 200mm. The length of the connecting wire rope 30 is 600mm, and the diameter is 15mm. The length of the cover plate 33 is 1250mm, the width is 430mm, and the thickness is 8mm.
Claims
1. An adjustable conveyor belt tensioning device for a belt conveyor, characterized in that: It comprises a redirecting roller fixed beam (2), a redirecting roller seat (3), a redirecting roller (4), a tensioning roller sliding guide rod (5), a tensioning roller frame (6), a tensioning roller (7), an electric hoist (8), and a multi-stage tensioning weight (9). The redirecting roller fixed beam (2) is two parallel horizontal beams. The two horizontal beams are located below the conveyor belt (1) of the belt conveyor. The length directions of the two horizontal beams are along the running direction of the conveyor belt (1). The two ends of the two horizontal beams are respectively connected to the building embedded parts. Two redirecting roller seats (3) are respectively fixed on the two horizontal beams. The two redirecting rollers (4) are placed in parallel above the two horizontal beams. The two ends of the roller shafts of the two redirecting rollers (4) are respectively installed and connected to the redirecting roller seats (3) on the two horizontal beams. The two tensioning roller sliding guide rods (5) are placed vertically. The two tensioning roller sliding guide rods (5) are respectively located between the two redirecting rollers (4). The two tensioning roller sliding guide rods (5) The upper ends of the two tensioning rollers (7) are respectively welded vertically to the lower surfaces of the two horizontal beams of the redirecting roller fixed beam (2), the lower ends of the two tensioning roller sliding guide rods (5) are respectively connected to the building embedded parts, the tensioning roller (7) is located below between the two redirecting rollers (4), the tensioning roller (7) is parallel to the redirecting roller (4), one end of the conveyor belt (1) passes through the upper surface of one redirecting roller (4) downwardly around the lower surface of the tensioning roller (7), and then passes through the upper surface of the other redirecting roller (4) upwardly, the tensioning roller frame (6) is located between the two tensioning roller sliding guide rods (5), the outer sides of the two ends of the tensioning roller frame (6) are respectively slidably matched with the tensioning roller sliding guide rods (5), the two ends of the roller shaft of the tensioning roller (7) are respectively connected to the inner sides of the two ends of the tensioning roller frame (6), the electric hoist (8) is installed at the middle bottom of the tensioning roller frame (6), and the hook (24) of the electric hoist (8) is hoisted and connected with the multi-stage tensioning weight (9).
2. The adjustable belt conveyor belt tensioning device according to claim 1, characterized in that: The tensioning roller frame (6) comprises a sliding sleeve (10), a bearing seat plate (11), a bearing seat (12), a fixing bolt (13), a crossbeam (14), and a shield (15). The two sliding sleeves (10) are plate frame structures with U-shaped cross sections. The U-shaped plate frames of the two sliding sleeves (10) are sleeved on the inner sides of the two tensioning roller sliding guide rods (5). The horizontal bearing seat plates (11) are vertically welded to the outer walls of the bottom plates of the U-shaped plate frames of the two sliding sleeves (10). The bearing seat plates (11) are provided with connecting holes. The bearing seats (12) are fixed to the bearing seat plates (11) by fixing bolts (13), and bearings are installed in the bearing seats (12). The two ends of the roller shaft of the tensioning roller (7) are respectively connected to the bearings of the bearing seats (12). The crossbeam (14) of the tensioning roller frame (6) is placed horizontally, and the two ends of the crossbeam (14) are respectively welded to the lower parts of the two sliding sleeves (10). The shield (15) is located above the tensioning roller (7), and the two ends of the shield (15) are respectively connected to the upper ends of the two sliding sleeves (10).
3. The adjustable belt conveyor belt tensioning device according to claim 1, characterized in that: The electric hoist (8) comprises a hanger (16), a drum (17), a motor (18), a reducer (19), a steel wire rope (23), a hook (24), a steel wire rope buckle (25), and a high-precision tension sensor (26). The hanger (16) is composed of two vertical steel plates, which are parallel and oppositely welded to the lower end surface of the crossbeam (14) of the tensioning roller frame (6). The drum (17) is installed between the two steel plates of the hanger (16). The motor (18) and the reducer (19) are respectively located at both ends of the drum (17). The motor (18) is connected to the drum (17) by a coupling. The reducer (22) is connected to the input shaft (20) of the reducer (19), the final gear of the reducer (19) is connected to the output shaft (21), the output shaft (21) is connected to the drum (17), one end of two steel wire ropes (23) are respectively fixed in the middle of the drum (17), and are wound on the drum (17) according to the direction of the rope groove, the other ends of the two steel wire ropes (23) respectively pass through two hooks (24) and are fixed to the lower end of the steel plate of the hanger (16) by the steel wire rope buckle (25), and the high-precision tension sensor (26) is installed below the steel wire rope buckle (25).
4. The adjustable conveyor belt tensioning device for a belt conveyor according to claim 1, characterized in that: The multi-stage tensioning hammer (9) comprises a plurality of counterweight boxes (27), the counterweight box (27) comprising a hanging beam (31), a box body (32), a cover plate (33), and a counterweight block (34). The hanging beam (31) is a rectangular frame welded by steel pipes. The length direction of the hanging beam (31) is in the horizontal direction. The rectangular frame plane of the hanging beam (31) is in a vertical position. The box body (32) is a rectangular parallelepiped. The box body (32) is fixedly connected to both sides of the hanging beam (31). A movable cover plate (33) is provided at the upper end of the box body (32). The counterweight block (34) is placed in the box body (32). The two ends of the hanging beams (31) of the plurality of counterweight boxes (27) are connected vertically in sequence by connecting steel wire ropes (30). The upper end of the top counterweight box (27) is connected to a lifting ring (28) by a hanging steel wire rope (29). The lifting ring (28) is hangingly connected to a hook (24) at the lower end of an electric hoist (8).