Tensioning device based on steel belt bundling machine and using method of tensioning device

Abstract

The invention discloses a tensioning device based on a steel belt bundling machine, and relates to the technical field of steel belt bundling machines. The device comprises a translation stretching mechanism, a clamping mechanism and a push block mechanism, the clamping mechanism comprises an upper clamping block, a lower clamping block and a rear sliding frame, the upper clamping block and the lower clamping block are symmetrically arranged, a belt clamping groove is formed between the upper clamping block and the lower clamping block, an arc-shaped concave part is arranged on the bottom surface of the upper clamping block, and an arc-shaped convex part matched with the arc-shaped concave part is arranged on the top surface of the lower clamping block. Through the design of the translation stretching mechanism, the clamping mechanism and the pushing block mechanism can be driven to respectively push and pull materials, the clamping of the clamping mechanism can be realized through the independent driving of the pushing block mechanism, and the tensioning of a steel belt can be realized through the synchronous driving of the pushing block mechanism and the clamping mechanism; through the design of the electromagnetic clutch, connection and disconnection control between the upper lead screw and the lower lead screw can be achieved, a steel belt can be automatically tensioned, meanwhile, the upper lead screw and the lower lead screw can be driven to move horizontally through an independent motor, and the effects of facilitating control and saving energy are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel strip strapping machines, and particularly relates to a tensioning device based on a steel strip strapping machine and a using method thereof. Background Technique

[0002] For a steel strip strapping machine, it mainly consists of a pay-off, a traction, a winding mechanism, a tension control mechanism, a steel strip guide groove, a cutting mechanism and a locking mechanism. Among them, the winding mechanism is used for tensioning the steel strip. The current winding mechanism uses a wheel set to tension the steel strip. However, the contact area with the steel strip is small, and sliding problems are likely to occur, thus affecting the tensioning effect and the subsequent strapping quality. At the same time, the existence of friction will cause damage to the surface of the wheel parts, affecting the subsequent work.

[0003] If a clamping mechanism of a splint type is used to clamp the steel strip and a device for driving the pulling belt through a translation mechanism can stably pull the belt, the hydraulic / pneumatic drive and the splint need to resist a large force, resulting in problems such as poor clamping effect, insufficient service life, poor stability, more driving parts used, higher cost and difficulty in automatic control. Summary of the Invention

[0004] The purpose of the invention is to provide a tensioning device based on a steel strip strapping machine. Through the design of a translation and stretching mechanism, it can drive the clamping mechanism and the push block mechanism to respectively push the pulling material. The separate drive of the push block mechanism can realize the clamping of the clamping mechanism, and the synchronous drive of the push block mechanism and the clamping mechanism can realize the tensioning of the steel strip. Through the design of an electromagnetic clutch, the connection and disconnection control between the upper lead screw and the lower lead screw can be realized, and the steel strip can be tensioned automatically. At the same time, a single motor can be used to drive the translation of both, which is beneficial for control and energy saving.

[0005] To solve the above technical problems, the invention is realized through the following technical solutions: The invention is a tensioning device based on a steel strip strapping machine, including a translation and stretching mechanism, a clamping mechanism and a push block mechanism; The clamping mechanism includes an upper clamp block, a lower clamp block and a rear sliding frame; The upper clamp block and the lower clamp block are symmetrically arranged and form a clamping groove therebetween. An arc-shaped recess is provided on the bottom surface of the upper clamp block, and an arc-shaped protrusion matching the arc-shaped recess is provided on the top surface of the lower clamp block; The thicknesses of the upper clamp block and the lower clamp block increase sequentially from front to back. One surface of the upper clamp block and the lower clamp block that are opposite to each other is an inclined surface and is provided with a sliding groove along the length direction. Vertical edges are provided on both sides of the upper clamp block and the lower clamp block; The rear sliding frame includes a group of outer horizontal edges, a bottom plate is provided between the two outer horizontal edges, the two outer horizontal edges are respectively arranged below the two sides of the lower clamping block, a group of vertical rails are fixed on the top of the outer horizontal edges, and the upper clamping block and the lower clamping block are slidably connected to the vertical rails through the vertical edges; The push block mechanism comprises a front sliding frame, an upper push block and a lower push block; The bottom surface of the upper push block and the top surface of the lower push block are both inclined surfaces and slide along the top surface of the upper clamp block and the bottom surface of the lower clamp block respectively. The bottom surface of the upper push block and the top surface of the lower push block are both provided with inclined sliding edges slidably connected to the slide groove; The front sliding frame comprises a rectangular frame, which is arranged at the front side of the rear sliding frame, and the rear sides of both sides of the rectangular frame are provided with a clearance opening, and the front sides of the upper push block and the lower push block are fixed to the rectangular frame through a pressure sensor; The translation stretching mechanism comprises a motor reducer and a strip-shaped bin, wherein an upper lead screw and a lower lead screw are respectively disposed at the upper and lower parts of the strip-shaped bin; The front sliding frame and the rear sliding frame both slide along the top of the strip bin, and the rectangular frame and the bottom of the bottom plate are respectively provided with a front screw sleeve and a rear screw sleeve threadedly connected to the upper screw and the lower screw; The motor reducer is arranged on the front side of the strip warehouse, the front end parts of the upper lead screw and the lower lead screw pass through the strip warehouse and are respectively connected to the upper shaft end and the lower shaft end, the upper shaft end is connected to the output end of the motor reducer, the lower shaft end is connected to the external shaft through an electromagnetic clutch, and the external shaft and the upper shaft end are connected through a gear set.

[0006] Furthermore, it also includes a steel belt body, the end of the steel belt body away from the motor reducer is the tail end, the steel belt body passes through the entrainment groove, the steel belt body forms a reinforcement point in the entrainment groove through the arc-shaped convex part and the arc-shaped concave part, and a gap is formed between the two sides of the steel belt body and the two sides in the rectangular frame.

[0007] Furthermore, it also includes a shield body, the gear set includes a group of gears meshing with each other, both gears are located in the shield body, bearings are provided between the external shaft and the connection point between the upper shaft end and the shield body, and the spiral directions of the upper screw and the lower screw are opposite and the pitches are consistent.

[0008] Furthermore, the bottom surface of the front screw sleeve is higher than the lower screw, and the rear screw sleeve is provided with a clearance groove which is concentric with the upper screw.

[0009] Furthermore, inner horizontal edges are provided at the bottom of both sides of the rectangular frame, inner slide rails and outer slide rails are provided at both sides of the top of the strip bin, and the inner horizontal edges and outer horizontal edges are slidably connected to the inner slide rails and the outer slide rails respectively.

[0010] Furthermore, a reinforcement plate is fixed between the two vertical rails at the top of the outer horizontal edge, and the reinforcement plate does not interfere with the upper clamping block and the lower clamping block.

[0011] Furthermore, a proximity sensor is fixed on one side of the front end of the strip bin, and the proximity sensor faces the middle of the strip bin.

[0012] Furthermore, it further includes a control device. The control device includes a processor and several control units. A torque sensor is provided on the motor reducer. The torque sensor, pressure sensor, electromagnetic clutch, motor reducer and proximity sensor are all electrically connected to the processor.

[0013] Furthermore, a number of fixing ears are provided on both bottom sides of the strip bin, and the bottom surface of the strip bin, the bottom surface of the shield body and the bottom surface of the motor reducer are flush.

[0014] A usage method of a tensioning device based on a steel belt strapping machine according to the present invention includes the following steps: SS01 When tensioning is required, start the motor reducer to drive the upper lead screw to rotate. The electromagnetic clutch is in the disconnected state. The threaded connection between the upper lead screw and the front nut sleeve drives the front sliding frame to translate; SS02 The rear sliding frame is in a stationary state through the self-locking ability of the lower lead screw and the rear nut sleeve. The front sliding frame moves relatively backward to the rear sliding frame, driving the upper push block and the lower push block to move backward, and the translation of the upper push block and the lower push block drives the upper clamping block and the lower clamping block to move relatively along the vertical rail to clamp the steel belt body; SS03 The pressure sensor detects the pressure between the upper clamping block and the lower clamping block and the front sliding frame, so as to detect the clamping degree of the upper clamping block and the lower clamping block. After detecting that the clamping is in place, control the electromagnetic clutch to be in the connected state through the processor to realize the connection between the upper shaft end and the external shaft; SS04 The motor reducer continues to operate. While the upper lead screw rotates, it synchronously drives the lower lead screw to rotate through the gear, electromagnetic clutch and external shaft. The synchronous rotation of the upper lead screw and the lower lead screw synchronously drives the front sliding frame and the rear sliding frame to move to the rear side of the strip bin, and the steel belt body is synchronously pulled and tensioned; SS05 When the tensioning degree is in place, the torque sensor detects that the torque is in place, and controls the motor reducer to stop through the processor. When the strapping machine finishes strapping, control the motor reducer to reverse to drive the front sliding frame and the rear sliding frame to reset, and have the ability to convey the steel belt body. When the proximity sensor detects the rear sliding frame, control the electromagnetic clutch to disconnect, the position of the rear sliding frame is locked, and the motor reducer continues to drive the front sliding frame to move to release the locking of the upper clamping block and the lower clamping block on the steel belt body.

[0015] The present invention has the following beneficial effects: 1. Through the design of the translation and stretching mechanism, the present invention can drive the clamping mechanism and the pushing block mechanism to respectively push the pulling material. The separate drive of the pushing block mechanism can realize the entrainment of the clamping mechanism, and the synchronous drive of the pushing block mechanism and the clamping mechanism can realize the tensioning of the steel strip. Through the design of the electromagnetic clutch, the connection and disconnection control between the upper lead screw and the lower lead screw can be realized, the steel strip can be tensioned automatically, and at the same time, a single motor can be used to drive the translation of both, which is beneficial for control and energy saving.

[0016] 2. Through the clamping mechanism of the clamping block type, the contact surface with the steel strip is large, which can improve the entrainment ability. There is no dynamic friction between the strip body and the clamping mechanism, avoiding the damage problem caused by friction, improving the service life of the clamping mechanism, and ensuring the quality of the steel strip.

[0017] 3. Through the design of the arc-shaped concave part and the arc-shaped convex part on the upper clamping block and the lower clamping block, a reinforcement point with a certain deformation can be formed in the entrainment groove, further improving the clamping effect on the steel strip, improving the subsequent stability of the pulling belt, improving the bundling effect, and the arc-shaped concave part and the arc-shaped convex part have a large radian, and can quickly reset during the next tensioning process without damaging the steel strip.

[0018] 4. The upper lead screw and the lower lead screw of the present invention play a role in translational transmission. There is a self-locking function and a strong anti-load capacity between the screw sleeve and the lead screw, improving the position stability and displacement stability of the clamping mechanism and the pushing block mechanism.

[0019] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of a tensioning device based on a steel strip bundling machine of the present invention; Figure 2 It is a structural sectional view in the length direction of the present invention; Figure 3 It is a structural sectional view in the width direction of the present invention; Figure 4 It is a schematic structural diagram of the clamping mechanism; Figure 5 It is a schematic structural diagram of the pushing block mechanism; Figure 6 It is a structural sectional view at the position of the shield body; In the accompanying drawings, the list of components represented by each reference numeral is as follows: 1 - Translation and stretching mechanism, 2 - Clamping mechanism, 3 - Pusher block mechanism, 4 - Shield body, 5 - Steel strip body, 101 - Motor reducer, 102 - Strip bin, 103 - Upper lead screw, 104 - Lower lead screw, 105 - Inner slide rail, 106 - Outer slide rail, 107 - Upper shaft end, 108 - Lower shaft end, 109 - Electromagnetic clutch, 110 - External shaft, 111 - Gear, 112 - Fixed ear, 113 - Proximity sensor, 201 - Upper clamping block, 202 - Lower clamping block, 203 - Arc-shaped recess, 204 - Arc-shaped protrusion, 205 - Chute, 206 - Vertical edge, 207 - Outer horizontal edge, 208 - Base plate, 209 - Vertical rail, 210 - Reinforcement plate, 301 - Upper pusher block, 302 - Lower pusher block, 303 - Inclined slide edge, 304 - Rectangular frame, 305 - Inner horizontal edge, 306 - Relief opening, 307 - Pressure sensor, 308 - Front screw sleeve, 309 - Rear screw sleeve, 310 - Relief groove. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1-6 As shown, the present invention is a tensioning device based on a steel strip bundling machine, including a translation and stretching mechanism 1, a clamping mechanism 2 and a pusher block mechanism 3; The clamping mechanism 2 includes an upper clamping block 201, a lower clamping block 202 and a rear sliding frame; The upper clamping block 201 and the lower clamping block 202 are symmetrically arranged and form a clamping groove therebetween. An arc-shaped recess 203 is provided on the bottom surface of the upper clamping block 201, and an arc-shaped protrusion 204 cooperating with the arc-shaped recess 203 is provided on the top surface of the lower clamping block 202; The thicknesses of the upper clamping block 201 and the lower clamping block 202 increase sequentially from front to back. One surface of the upper clamping block 201 and the lower clamping block 202 facing away from each other is an inclined surface and a chute 205 is provided along the length direction. Vertical edges 206 are provided on both sides of the upper clamping block 201 and the lower clamping block 202; The rear sliding frame includes a group of outer horizontal edges 207. A base plate 208 is provided between the two outer horizontal edges 207. The two outer horizontal edges 207 are respectively arranged below both sides of the lower clamping block 202. A group of vertical rails 209 are fixed on the top of the outer horizontal edges 207. The upper clamping block 201 and the lower clamping block 202 are slidably connected to the vertical rails 209 through the vertical edges 206; The pusher block mechanism 3 includes a front sliding frame, an upper pusher block 301 and a lower pusher block 302; The bottom surface of the upper push block 301 and the top surface of the lower push block 302 are both inclined surfaces and slide along the top surface of the upper clamping block 201 and the bottom surface of the lower clamping block 202 respectively. The bottom surface of the upper push block 301 and the top surface of the lower push block 302 are both provided with an inclined sliding edge 303 slidably connected to the slide groove 205; The front sliding frame includes a rectangular frame 304, which is arranged at the front side of the rear sliding frame. The rear sides of both sides of the rectangular frame 304 are provided with a clearance opening 306. The front sides of the upper push block 301 and the lower push block 302 are fixed to the rectangular frame 304 through a pressure sensor 307. The translation stretching mechanism 1 comprises a motor reducer 101 and a strip-shaped bin 102, wherein an upper lead screw 103 and a lower lead screw 104 are respectively disposed at the upper and lower parts of the strip-shaped bin 102; The front sliding frame and the rear sliding frame both slide along the top of the strip bin 102, and the bottom of the rectangular frame 304 and the bottom of the bottom plate 208 are respectively provided with a front screw sleeve 308 and a rear screw sleeve 309 which are threadedly connected with the upper screw 103 and the lower screw 104; The motor reducer 101 is arranged on the front side of the strip bin 102, the front end portions of the upper lead screw 103 and the lower lead screw 104 pass through the strip bin 102 and are respectively connected to an upper shaft end 107 and a lower shaft end 108, the upper shaft end 107 is connected to the output end of the motor reducer 101, the lower shaft end 108 is connected to an external shaft 110 via an electromagnetic clutch 109, and the external shaft 110 and the upper shaft end 107 are connected via a gear set.

[0024] Among them Figures 1-2 As shown, it also includes a steel strip 5, the end of the steel strip 5 away from the motor reducer 101 is the tail end, the steel strip 5 passes through the entrainment groove, and the steel strip 5 forms a reinforcement point in the entrainment groove through the arc-shaped protrusion 204 and the arc-shaped recessed portion 203, and a gap is formed between the two sides of the steel strip 5 and the two sides in the rectangular frame 304.

[0025] Among them Figures 1-2 and Figure 6 As shown, it also includes a shield body 4, the gear set includes a group of gears 111 meshing with each other, the two gears 111 are both located in the shield body 4, bearings are provided between the external shaft 110 and the connection points between the upper shaft end 107 and the shield body 4, and the spiral directions of the upper screw 103 and the lower screw 104 are opposite and the pitches are consistent.

[0026] Among them Figures 2-5 As shown, the bottom surface of the front screw sleeve 308 is higher than the lower screw 104, and the rear screw sleeve 309 is provided with a clearance groove 310 which is concentric with the upper screw 103.

[0027] Among them Figure 3 and Figure 5As shown, inner horizontal edges 305 are provided at both bottoms of the rectangular frame 304, and inner slide rails 105 and outer slide rails 106 are provided at both sides of the top of the strip-shaped bin 102. The inner horizontal edge 305 and the outer horizontal edge 207 are slidably connected to the inner slide rail 105 and the outer slide rail 106 respectively.

[0028] As shown in Figure 1 and Figures 3-4 shown, a reinforcement plate 210 is fixed between the two vertical rails 209 at the top of the outer horizontal edge 207, and the reinforcement plate 210 does not interfere with the upper clamping block 201 and the lower clamping block 202.

[0029] As shown in Figures 1-2 shown, a proximity sensor 113 is fixed on one side of the front end of the strip-shaped bin 102, and the proximity sensor 113 faces the middle of the strip-shaped bin 102.

[0030] Moreover, it further includes a control device. The control device includes a processor and several control units. A torque sensor is provided on the motor speed reducer 101. The torque sensor, the pressure sensor 307, the electromagnetic clutch 109, the motor speed reducer 101, and the proximity sensor 113 are all electrically connected to the processor.

[0031] As shown in Figure 1 shown, several fixing ears 112 are provided at both bottom edges of the strip-shaped bin 102, and the bottom surfaces of the strip-shaped bin 102, the bottom surface of the shield body 4, and the bottom surface of the motor speed reducer 101 are flush.

[0032] A usage method of a tensioning device based on a steel belt strapping machine according to the present invention includes the following steps: SS01 When tensioning is required, start the motor speed reducer 101 to drive the upper lead screw 103 to rotate. The electromagnetic clutch 109 is in the off state. The threaded connection between the upper lead screw 103 and the front nut 308 drives the front sliding frame to translate; SS02 The rear sliding frame is in a static state through the self-locking ability of the lower lead screw 104 and the rear nut 309. The front sliding frame moves relatively backward to the rear sliding frame, driving the upper pushing block 301 and the lower pushing block 302 to move backward, and the translation of the upper pushing block 301 and the lower pushing block 302 drives the upper clamping block 201 and the lower clamping block 202 to move relatively along the vertical rail 209 to clamp the steel belt body 5; SS03 The pressure sensor 307 detects the pressure between the upper clamping block 201 and the lower clamping block 202 and the front sliding frame, so as to detect the clamping degree of the upper clamping block 201 and the lower clamping block 202. After detecting that the clamping is in place, the processor controls the electromagnetic clutch 109 to be in the connected state to realize the connection between the upper shaft end 107 and the external shaft 110; The SS04 motor reducer 101 continues to operate. While the upper lead screw 103 rotates, it synchronously drives the lower lead screw 104 to rotate through the gear 111, electromagnetic clutch 109 and external shaft 110. The synchronous rotation of the upper lead screw 103 and the lower lead screw 104 synchronously drives the front sliding frame and the rear sliding frame to move towards the rear side of the strip bin 102, and the steel belt body 5 is synchronously pulled and tightened. SS05 When the tightening degree reaches the required level, the torque sensor detects that the torque is in place, and the motor reducer 101 is controlled to stop by the processor. After the baler finishes baling, the motor reducer 101 is controlled to reverse to drive the front sliding frame and the rear sliding frame to reset, and it has the ability to convey the steel belt body 5. When the proximity sensor 113 detects the rear sliding frame, the electromagnetic clutch 109 is controlled to disconnect, and the position of the rear sliding frame is locked. The motor reducer 101 continues to drive the front sliding frame to move, and the locking of the steel belt body 5 by the upper clamp block 201 and the lower clamp block 202 is released.

[0033] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0034] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, according to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A tensioning device based on a steel strapping machine, characterized in that: It comprises a translation stretching mechanism (1), a clamping mechanism (2) and a block pushing mechanism (3); The clamping mechanism (2) comprises an upper clamping block (201), a lower clamping block (202) and a rear sliding frame; The upper clamping block (201) and the lower clamping block (202) are symmetrically arranged and a clamping groove is formed therebetween; the bottom surface of the upper clamping block (201) is provided with an arc-shaped recessed portion (203), and the top surface of the lower clamping block (202) is provided with an arc-shaped protruding portion (204) that cooperates with the arc-shaped recessed portion (203); The thickness of the upper clamping block (201) and the lower clamping block (202) increases from front to back, the surfaces opposite to each other of the upper clamping block (201) and the lower clamping block (202) are both inclined surfaces and are provided with sliding grooves (205) along the length direction, and both sides of the upper clamping block (201) and the lower clamping block (202) are provided with vertical edges (206); The rear sliding frame comprises a group of outer horizontal edges (207), a bottom plate (208) is provided between the two outer horizontal edges (207), the two outer horizontal edges (207) are respectively arranged below the two sides of the lower clamping block (202), a group of vertical rails (209) are fixed on the top of the outer horizontal edges (207), and the upper clamping block (201) and the lower clamping block (202) are slidably connected to the vertical rails (209) via the vertical edges (206); The push block mechanism (3) comprises a front sliding frame, an upper push block (301) and a lower push block (302); The bottom surface of the upper push block (301) and the top surface of the lower push block (302) are both inclined surfaces and slide along the top surface of the upper clamping block (201) and the bottom surface of the lower clamping block (202) respectively. The bottom surface of the upper push block (301) and the top surface of the lower push block (302) are both provided with an inclined sliding edge (303) slidably connected to the sliding groove (205); The front sliding frame comprises a rectangular frame (304), the rectangular frame (304) is arranged at the front side of the rear sliding frame, and the rear sides of both sides of the rectangular frame (304) are provided with a clearance opening (306), and the front sides of the upper push block (301) and the lower push block (302) are fixed to the rectangular frame (304) via a pressure sensor (307); The translation stretching mechanism (1) comprises a motor reducer (101) and a strip-shaped bin (102), wherein an upper lead screw (103) and a lower lead screw (104) are respectively provided at the upper and lower parts of the strip-shaped bin (102); The front sliding frame and the rear sliding frame both slide along the top of the strip-shaped bin (102), and the bottom of the rectangular frame (304) and the bottom of the bottom plate (208) are respectively provided with a front screw sleeve (308) and a rear screw sleeve (309) threadedly connected to the upper screw (103) and the lower screw (104); The motor reducer (101) is arranged at the front side of the strip-shaped bin (102); the front ends of the upper lead screw (103) and the lower lead screw (104) pass through the strip-shaped bin (102) and are respectively connected to an upper shaft end (107) and a lower shaft end (108); the upper shaft end (107) is connected to the output end of the motor reducer (101); the lower shaft end (108) is connected to an external shaft (110) via an electromagnetic clutch (109); and the external shaft (110) and the upper shaft end (107) are connected via a gear set.

2. A tensioning device based on a steel strapping machine according to claim 1, characterized in that: It also includes a steel strip body (5), the end of the steel strip body (5) away from the motor reducer (101) being the tail end, the steel strip body (5) passing through the entrainment groove, the steel strip body (5) forming a reinforcement point in the entrainment groove through the arc-shaped convex portion (204) and the arc-shaped concave portion (203), and a gap is formed between the two sides of the steel strip body (5) and the two sides in the rectangular frame (304).

3. A tensioning device based on a steel strapping machine according to claim 1, characterized in that: It also includes a shield body (4), the gear set including a group of mutually meshing gears (111), the two gears (111) are both located in the shield body (4), bearings are provided between the connection points of the external shaft (110) and the upper shaft end (107) and the shield body (4), and the upper lead screw (103) and the lower lead screw (104) have opposite spiral directions and consistent pitches.

4. A tensioning device based on a steel strapping machine according to claim 1, characterized in that: The bottom surface of the front screw sleeve (308) is higher than the lower screw (104), and the rear screw sleeve (309) is provided with a clearance groove (310) concentric with the upper screw (103).

5. The tensioning device based on a steel strapping machine according to claim 1, characterized in that: The bottom of both sides of the rectangular frame (304) are provided with inner horizontal edges (305), and the top of the strip-shaped bin (102) is provided with inner slide rails (105) and outer slide rails (106) on both sides. The inner horizontal edges (305) and the outer horizontal edges (207) are slidably connected to the inner slide rails (105) and the outer slide rails (106) respectively.

6. The tensioning device based on a steel strapping machine according to claim 1, characterized in that: A reinforcing plate (210) is fixed between the two vertical rails (209) at the top of the outer horizontal edge (207), and the reinforcing plate (210) does not interfere with the upper clamping block (201) and the lower clamping block (202).

7. The tensioning device based on a steel strapping machine according to claim 1, characterized in that: A proximity sensor (113) is fixed to one side of the front end of the strip-shaped bin (102), and the proximity sensor (113) faces the middle of the strip-shaped bin (102).

8. The tensioning device based on a steel strapping machine according to claim 7, characterized in that: It also includes a control device, the control device including a processor and a plurality of control units, the motor reducer (101) is provided with a torque sensor, and the torque sensor, the pressure sensor (307), the electromagnetic clutch (109), the motor reducer (101) and the proximity sensor (113) are all electrically connected to the processor.

9. The tensioning device based on a steel strapping machine according to claim 3, characterized in that: A plurality of fixing ears (112) are provided on the bottom edges of both sides of the strip-shaped bin (102), and the bottom surface of the strip-shaped bin (102), the bottom surface of the shield body (4) and the bottom surface of the motor reducer (101) are flush.

10. A method for using a tensioning device based on a steel strapping machine according to any one of claims 1 to 9, characterized in that: The following steps are involved: When SS01 needs to be tightened, the motor reducer (101) is started to drive the upper lead screw (103) to rotate, the electromagnetic clutch (109) is in a disconnected state, and the threaded connection between the upper lead screw (103) and the front screw sleeve (308) drives the front sliding frame to translate; The SS02 rear sliding frame is in a stationary state due to the self-locking ability of the lower lead screw (104) and the rear screw sleeve (309), and the front sliding frame moves relatively toward the rear sliding frame, driving the upper push block (301) and the lower push block (302) to move backward, and the translation of the upper push block (301) and the lower push block (302) drives the upper clamping block (201) and the lower clamping block (202) to move relatively along the vertical rail (209) to clamp the steel strip body (5); The SS03 pressure sensor (307) detects the pressure between the upper clamping block (201) and the lower clamping block (202) and the front sliding frame, thereby detecting the clamping degree of the upper clamping block (201) and the lower clamping block (202). After detecting that the clamping is in place, the processor controls the electromagnetic clutch (109) to be in a connected state, thereby realizing the connection between the upper shaft end (107) and the external shaft (110); The SS04 motor reducer (101) continues to operate, and the upper lead screw (103) rotates while synchronously driving the lower lead screw (104) to rotate through the gear (111), the electromagnetic clutch (109) and the external shaft (110). The upper lead screw (103) and the lower lead screw (104) rotate at the same speed, synchronously driving the front sliding frame and the rear sliding frame to move toward the rear side of the strip bin (102), and the steel belt body (5) is synchronously pulled and tightened; SS05 When the tension level is in place, the torque sensor detects that the torque is in place, and the processor controls the motor reducer (101) to stop. When the baler finishes baling, the motor reducer (101) is controlled to reverse and drive the front sliding frame and the rear sliding frame to reset, and has the ability to convey the steel strip (5). When the proximity sensor (113) detects the rear sliding frame, the electromagnetic clutch (109) is controlled to disconnect, the position of the rear sliding frame is locked, and the motor reducer (101) continues to drive the front sliding frame to move, releasing the lock of the upper clamping block (201) and the lower clamping block (202) on the steel strip (5).

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