A coiling device for throat hoop processing

Abstract

The invention discloses a coiling device for throat clamp processing, which comprises: a frame, a shaping coiling unit, a forming block, a left pushing mechanism, a right pushing mechanism, a pre-bending unit and an automatic screw adjuster, wherein the shaping coiling unit is arranged in the middle of the frame, the forming block is detachably and horizontally mounted on the shaping coiling unit, and the cross section of the forming block is a circular structure; a left pushing mechanism and a right pushing mechanism are correspondingly arranged on both sides of the shaping coiling unit on the frame, and the pushing working ends of the left pushing mechanism and the right pushing mechanism are both equipped with a top pressure block; the pre-bending unit is arranged on the frame at the rear of the shaping coiling unit; a lifting mechanism is also arranged on the frame below the shaping coiling unit, a horizontal moving device is laterally fixed on the lifting mechanism, the automatic screw adjuster is horizontally fixed on the horizontal moving device, and the automatic screw adjuster tightens the screw into the hoop head after the steel strip completes the preliminary coiling and shaping.

Description

Technical Field

[0001] The invention belongs to the technical field of throat clamp production, in particular to a coiling device for throat clamp processing. Background Art

[0002] Laryngeal clamps (hose clamps) are widely used in automobiles, tractors, locomotives, ships, mines, petroleum, chemicals, pharmaceuticals, agriculture and other fields. They can tightly clamp flexible pipes on rigid parts and are used for sealing in water, oil, gas, dust and other fields. They are ideal connecting fasteners. Traditional throat clamp processing usually involves a series of metal forming processes such as cutting, stamping, and bending. Among them, coiling is one of the key steps in producing circular throat clamps. For throat clamps, it is mainly through continuous bending of metal strips until a closed loop is formed; although the common coiling equipment can realize the coiling of throat clamps, the steel strip of the throat clamp cannot be wound in the hoop head, resulting in elastic recovery of the steel strip during subsequent production of the throat clamp, causing the shape of the throat clamp to change, and there is a large difference; at the same time, when the throat clamp is subsequently installed with screws, it is impossible to determine whether it is correctly matched with the steel strip, and it is difficult to remove defective products by vision; therefore, it is necessary to provide a coiling device for throat clamp processing to solve the problems raised in the above background technology. Summary of the invention

[0003] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a coiling device for throat clamp processing, comprising: a frame, a shaping coiling unit, a forming block, a left pushing mechanism, a right pushing mechanism, a pre-bending unit and an automatic screw adjuster, wherein the shaping coiling unit is arranged in the middle of the frame, and a forming block is detachably and horizontally mounted on the shaping coiling unit, and the cross section of the forming block is a circular structure, so that the throat clamp steel strip can be coiled and shaped around the outer wall of the forming block; a left pushing mechanism and a right pushing mechanism are correspondingly arranged on both sides of the shaping coiling unit on the frame, and the pushing working ends of the left pushing mechanism and the right pushing mechanism are both installed with a top pressing block, and each of the top pressing blocks is extruded and matched with the forming block;

[0004] A pre-bending unit is arranged on the frame behind the shaping coil unit, and the pre-bending unit pre-bends the two ends of the steel strip at multiple angles for shaping; a material pushing device is arranged on the frame, and the material pushing device pushes the pre-bent steel strip into the shaping coil unit;

[0005] A lifting mechanism is also provided on the frame below the shaping coil unit, a horizontal moving device is transversely fixed on the lifting mechanism, and the automatic screw adjuster is horizontally fixed on the horizontal moving device; a screw feeding mechanism is provided on the frame at one side of the automatic screw adjuster, which is used to continuously feed screws to the automatic screw adjuster, and the automatic screw adjuster tightens the screws into the hoop head after the steel strip completes the preliminary coil shaping;

[0006] The pre-bending unit comprises a machine base, one side of which is transversely provided with a feeding rack, the feeding rack is used to horizontally convey the steel strips one by one, a shaping seat is installed outside the machine base at one side of the feeding rack, a pressing block is arranged in the middle of the machine base above the shaping seat, an electric telescopic rod is installed on the machine base, one end of the electric telescopic rod is connected to the pressing block;

[0007] Two driving plates are horizontally arranged on the machine base, and the two driving plates are slidably installed at different heights on the machine base through slide rails. A transmission tooth is connected to the central rotation on the machine base, and the transmission tooth is located between the two driving plates and is connected to each driving plate for transmission through gear meshing. A mounting frame is fixed on each driving plate, and a telescopic guide rod is vertically arranged on the mounting frame. A shaping block is installed at the lower end of the telescopic guide rod, and a hydraulic rod is also arranged on the mounting frame, and one end of the hydraulic rod is connected to the telescopic end of the telescopic guide rod; the shaping block cooperates with the shaping seat to pre-bend and shape the two ends of the steel belt.

[0008] Furthermore, preferably, the lower end surface of the shaping block is in an arc-shaped structure, and the end of the steel strip is bent in an arc shape after pre-bending and shaping. At this time, under the extrusion cooperation of the top pressure block and the forming block, the end of the steel strip can pass through the hoop head and complete the winding shaping.

[0009] Further, as a preference, the shaping coil unit comprises a fixing frame, a fixing rod is provided in the middle thereof, the forming block is coaxially fixed on the fixing rod, and is fixed to the fixing frame through the fixing rod; a positioning block is vertically slidably provided on the fixing frame, the positioning block is located directly above the forming block, and is used to position the center of the steel strip on the forming block;

[0010] The fixed rod is sleeved with a flexible expansion and contraction mechanism;

[0011] A pin mechanism is also slidably arranged on one side of the forming block on the fixing frame, and the pin mechanism is used to push the coiled steel strip into or out of the flexible expansion and contraction mechanism. The flexible expansion and contraction mechanism fully expands and contracts the coiled steel strip internally to make the steel strip completely deformed, and to check the assembly status of the screws on the hoop head.

[0012] Further, as a preferred embodiment, the flexible expansion and contraction mechanism comprises a shaft ring seat, a shaft cylinder is fixed at the inner center thereof, a guide shaft sleeve 1 symmetrically arranged left and right and a guide shaft sleeve 2 symmetrically arranged up and down are distributed on the shaft cylinder, and a push rod is slidably arranged inside the guide shaft sleeve 1 and the guide shaft sleeve 2; a plurality of radially arranged spring rods are distributed on the shaft ring seat between adjacent guide shaft sleeves 1 and 2;

[0013] The outer sleeve of the collar seat is provided with an elastically deformable aluminum plate tube, the ends of the push rods are supported on the inner wall of the aluminum plate tube, and rollers are provided on the spring rods, and the rollers roll and contact with the inner wall of the aluminum plate tube.

[0014] Further, as a preference, a rotating shaft is relatively rotatably arranged in the shaft cylinder, a connecting shaft is fixed on the rotating shaft, and a supporting rod is connected to each of the top rods located in the guide sleeve, and one end of the supporting rod is hinged to the connecting shaft;

[0015] The rotating shaft is fixed with internal teeth, and the top rod located in the second guide shaft sleeve is provided with tooth grooves, and the internal teeth are meshed with the tooth grooves for transmission.

[0016] Further, preferably, when the rotating shaft drives the push rod in the guide sleeve one to slide outward through the coupling during deflection adjustment, the push rod in the guide sleeve two slides inward under the drive of the internal teeth, and at this time, the aluminum plate cylinder outside the shaft ring seat expands in an elliptical shape.

[0017] Further, as a preference, a rack is horizontally slidably connected to the fixed frame, and an external tooth is coaxially rotatably connected to the fixed rod on the fixed frame, the external tooth is meshed with the rack for transmission, and the shaft ring seat in the flexible expansion and contraction mechanism is fixed to the external tooth; a thrust cylinder is provided on the fixed frame, and the thrust cylinder is connected to one end of the rack.

[0018] Further, as a preference, when the flexible expansion and contraction mechanism completes a single internal expansion and contraction of the steel belt, the thrust cylinder controls the sliding of the rack to allow the flexible expansion and contraction mechanism to turn. At this time, the automatic screw adjuster rests against the hoop head on the steel belt to prevent the steel belt from rotating with the flexible expansion and contraction mechanism.

[0019] Furthermore, preferably, the flexible expansion and contraction mechanism performs at least two internal expansion and contraction operations on the coiled steel strip, and the major axis directions of the two internal expansion and contraction operations are different.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Compared with the traditional throat clamp coiling device, the pre-bending unit provided in the present invention can preferentially pre-bend the two ends of the steel strip, so as to ensure that the ends of the steel strip can pass through the hoop head and be fully assembled during the subsequent steel strip coiling and bending; at the same time, the flexible expansion and contraction mechanism is also provided to expand and contract the steel strip internally after the throat clamp screws are installed, so as to further ensure the complete coiling of the steel strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a schematic structural diagram of the pre-bending unit in the present invention;

[0024] Figure 3 It is a structural schematic diagram of the shaping block in the present invention;

[0025] Figure 4It is a structural schematic diagram of the shaping coil unit in the present invention;

[0026] Figure 5 It is a structural schematic diagram of the flexible expansion and contraction mechanism in the present invention;

[0027] Figure 6 for Figure 5 The enlarged schematic diagram at A in the middle;

[0028] In the figure: 1. frame; 11. forming block; 12. left propulsion mechanism; 13. right propulsion mechanism; 14. top pressure block; 15. lifting mechanism; 16. automatic screw adjuster; 2. shaping coil unit; 21. fixing frame; 22. positioning block; 23. rack; 24. external gear; 25. propulsion cylinder; 3. pre-bending unit; 31. machine base; 32. feeding frame; 33. shaping seat; 34. pressure block; 35. driving plate; 36. transmission gear; 37. telescopic guide rod; 38. shaping block; 4. flexible support and contraction mechanism; 41. shaft ring seat; 42. shaft cylinder; 43. guide shaft sleeve 1; 44. guide shaft sleeve 2; 45. ejector rod; 46. spring rod; 47. aluminum plate cylinder. DETAILED DESCRIPTION

[0029] See also Figure 1-Figure 6 In an embodiment of the present invention, a coiling device for throat hoop processing includes: a frame 1, a shaping coiling unit 2, a forming block 11, a left pushing mechanism 12, a right pushing mechanism 13, a pre-bending unit 3 and an automatic screw adjuster 16, wherein the shaping coiling unit 2 is arranged in the middle of the frame 1, and the forming block 11 is detachably mounted horizontally on the shaping coiling unit 2, and the cross section of the forming block 11 is a circular structure, so that the throat hoop steel strip can be coiled and shaped around the outer wall of the forming block 11; the left pushing mechanism 12 and the right pushing mechanism 13 are correspondingly arranged on both sides of the shaping coiling unit 2 on the frame 1, and the pushing working ends of the left pushing mechanism 12 and the right pushing mechanism 13 are both installed with a top pressing block 14, and each of the top pressing blocks 14 is extruded and matched with the forming block 11, so as to realize the extrusion and coiling of the steel strip;

[0030] A pre-bending unit 3 is arranged on the frame 1 behind the shaping coil unit 2, and the pre-bending unit 3 pre-bends the two ends of the steel strip at multiple angles for shaping; a material pushing device (not shown in the figure) is arranged on the frame 1, and the material pushing device pushes the pre-bent steel strip into the shaping coil unit 2, that is, the material pushing device is used for automatic pushing of the steel strip, thereby improving the production efficiency of the throat hoop (it belongs to the prior art and will not be described in detail here);

[0031] The frame 1 is provided with a lifting mechanism 15 below the shaping coil unit 2, and a horizontal moving device is transversely fixed on the lifting mechanism 15, and the automatic screw adjuster 16 is horizontally fixed on the horizontal moving device; a screw feeding mechanism is provided on one side of the automatic screw adjuster 16 on the frame 1, which is used to continuously feed screws to the automatic screw adjuster 16, and the automatic screw adjuster 16 tightens the screws into the hoop head after the steel strip completes the preliminary coil shaping;

[0032] The pre-bending unit 3 includes a machine base 31, one side of which is transversely provided with a feeding rack 32, the feeding rack is used to horizontally convey the steel strips one by one, a shaping seat 33 is installed outside the machine base 31 on one side of the feeding rack 32, a pressing block 34 is arranged above the shaping seat 33 in the middle of the machine base 31, an electric telescopic rod is installed on the machine base 31, one end of the electric telescopic rod is connected to the pressing block 34, so that the steel strip can be pressed down and positioned on the shaping seat by the pressing block to avoid displacement of the steel strip;

[0033] Two driving plates 35 are horizontally arranged on the machine base 31, and the two driving plates 35 are slidably installed at different heights on the machine base 31 through slide rails. A transmission tooth 36 is rotatably connected to the center of the machine base 31, and the transmission tooth 36 is located between the two driving plates 35, and is connected to each driving plate 35 for transmission through gear meshing; a mounting frame is fixed on each driving plate 35, and a telescopic guide rod 37 is vertically arranged on the mounting frame, and a shaping block 38 is installed at the lower end of the telescopic guide rod 37. The mounting frame is also provided with a hydraulic rod, and one end of the hydraulic rod is connected to the telescopic end of the telescopic guide rod 37; the shaping block 38 cooperates with the shaping seat 33 to pre-bend and shape the two ends of the steel belt.

[0034] In this embodiment, the lower end face of the shaping block 38 is an arc-shaped structure, and the end of the steel strip is bent in an arc shape after pre-bending and shaping. At this time, under the extrusion cooperation of the top pressure block 14 and the forming block 11, the end of the steel strip can pass through the hoop head and complete the coil shaping; compared with traditional production, on the one hand, subsequent manual operations are avoided and the production process is accelerated; on the other hand, it can ensure that the size and shape of each throat hoop are uniform, improve the standardization of the product, and at the same time avoid the subsequent spring recovery of the steel strip, which is convenient for the full shaping of the steel strip.

[0035] As a preferred embodiment, the shaping coil unit 2 includes a fixing frame 21, a fixing rod is provided in the middle thereof, the forming block 11 is coaxially fixed on the fixing rod, and is fixed to the fixing frame 21 through the fixing rod; a positioning block 22 is vertically slidably provided on the fixing frame 21, and the positioning block 22 is located directly above the forming block 11, and is used to position the center of the steel strip on the forming block 11;

[0036] The fixed rod is sleeved with a flexible expansion and contraction mechanism 4;

[0037] A pin mechanism is also slidably provided on one side of the forming block on the fixing frame 21, and the pin mechanism is used to push the coiled steel strip into or out of the flexible expansion and contraction mechanism 4. The flexible expansion and contraction mechanism 4 fully expands and contracts the coiled steel strip internally, so that the steel strip is completely deformed, and checks the screw assembly status on the hoop head; problems such as loose screws can be discovered and corrected at an early stage, making it convenient to remove defective products.

[0038] In this embodiment, the flexible expansion and contraction mechanism 4 includes a shaft collar seat 41, a shaft cylinder 42 is fixed at the inner center thereof, a guide sleeve 1 43 symmetrically arranged left and right and a guide sleeve 2 44 symmetrically arranged up and down are distributed on the shaft cylinder 42, and a push rod 45 is slidably arranged in the guide sleeve 1 43 and the guide sleeve 2 44; a plurality of radially arranged spring rods 46 are distributed on the shaft collar seat 41 between adjacent guide sleeves 1 43 and guide sleeves 2 44;

[0039] The outer sleeve of the collar seat 41 is provided with an elastically deformable aluminum plate tube 47 , the ends of the push rod 45 are supported on the inner wall of the aluminum plate tube 47 , and a roller is provided on the spring rod 46 , and the roller rolls and contacts the inner wall of the aluminum plate tube 47 .

[0040] In this embodiment, a rotating shaft 5 is relatively rotatably arranged in the shaft cylinder 42, a connecting shaft 51 is fixed on the rotating shaft 5, and a supporting rod 52 is connected to each of the top rods 45 located in the guide sleeve 43, and one end of the supporting rod 52 is hinged to the connecting shaft 51;

[0041] The rotating shaft 5 is fixed with internal teeth, and a tooth groove is provided on the push rod 45 located in the second guide sleeve 44, and the internal teeth are meshed with the tooth groove for transmission.

[0042] In this embodiment, when the rotating shaft 5 drives the push rod 45 in the guide sleeve 1 43 to slide outward through the connecting shaft 51 during the deflection adjustment, the push rod 45 in the guide sleeve 2 44 slides inward under the drive of the internal teeth. At this time, the aluminum plate tube 47 outside the collar seat 41 is elliptically expanded. The elliptically expanded support can better control the deformation of the steel strip during the forming process, making the size of the final product more precise. At the same time, it can further improve the steel strip coil forming effect and reduce the elastic recovery of the steel strip in the later stage.

[0043] As a preferred embodiment, a rack 23 is horizontally slidably connected to the fixed frame 21, and an external tooth 24 is coaxially rotatably connected to the fixed frame 21 outside the fixed rod, the external tooth 24 is meshed with the rack 23 for transmission, and the shaft ring seat 41 in the flexible expansion and contraction mechanism 4 is fixed to the external tooth 24; a propulsion cylinder 25 is provided on the fixed frame 21, and the propulsion cylinder 25 is connected to one end of the rack 23.

[0044] In this embodiment, after the flexible expansion and contraction mechanism 4 completes a single internal expansion and contraction of the steel belt, the thrust cylinder 25 controls the sliding of the rack 23 to allow the flexible expansion and contraction mechanism 4 to turn. At this time, the automatic screw adjuster 16 rests against the hoop head on the steel belt to prevent the steel belt from rotating with the flexible expansion and contraction mechanism 4.

[0045] In this embodiment, the flexible expansion and contraction mechanism 4 performs internal expansion and contraction on the steel strip that has completed the coiling at least twice, and the long axis directions of the two internal expansion and contraction are different. That is to say, the flexible expansion and contraction mechanism 4 can perform internal expansion and contraction on the steel strip after coiling for multiple times, which can ensure that the steel strip is completely coiled and deformed, reducing the probability of its elastic recovery.

[0046] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A coiling device for throat hoop processing, comprising: A frame (1), a shaping coil unit (2), a forming block (11), a left propulsion mechanism (12), a right propulsion mechanism (13), a pre-bending unit (3) and an automatic screw adjuster (16), characterized in that: a shaping coil unit (2) is arranged in the middle of the frame (1), a forming block (11) is detachably mounted horizontally on the shaping coil unit (2), and a cross section of the forming block (11) is a circular structure so that the throat hoop steel strip can be shaped by winding around the outer wall of the forming block (11); a left propulsion mechanism (12) and a right propulsion mechanism (13) are arranged on both sides of the shaping coil unit (2) on the frame (1), and a top pressure block (14) is installed at the propulsion working end of the left propulsion mechanism (12) and the right propulsion mechanism (13), and each top pressure block (14) is pressed and matched with the forming block (11); A pre-bending unit (3) is arranged on the frame (1) behind the shaping coil unit (2), and the pre-bending unit (3) pre-bends the two ends of the steel strip at multiple angles for shaping; a material pushing device is arranged on the frame (1), and the material pushing device pushes the pre-bent steel strip into the shaping coil unit (2); A lifting mechanism (15) is also provided on the frame (1) below the shaping coil unit (2), a horizontal moving device is transversely fixed on the lifting mechanism (15), and an automatic screw adjuster (16) is horizontally fixed on the horizontal moving device; a screw feeding mechanism is provided on one side of the automatic screw adjuster (16) on the frame (1), which is used to continuously feed screws to the automatic screw adjuster (16), and the automatic screw adjuster (16) tightens the screws into the hoop head after the steel strip completes the initial coil shaping; The shaping coil unit (2) comprises a fixing frame (21), the middle of which is provided with a fixing rod, the shaping block (11) is coaxially fixed on the fixing rod and is fixed to the fixing frame (21) via the fixing rod; a positioning block (22) is vertically slidably provided on the fixing frame (21); A flexible expansion and contraction mechanism (4) is sleeved on the fixed rod; The flexible expansion and contraction mechanism (4) comprises a shaft ring seat (41), a shaft cylinder (42) is fixed at the center of the shaft ring seat, a guide shaft sleeve (43) arranged symmetrically left and right and a guide shaft sleeve (44) arranged symmetrically up and down are distributed on the shaft cylinder (42), and a push rod (45) is slidably arranged inside the guide shaft sleeve (43) and the guide shaft sleeve (44); a plurality of radially arranged spring rods (46) are distributed on the shaft ring seat (41) and located between adjacent guide shaft sleeves (43) and guide shaft sleeves (44); The outer sleeve of the collar seat (41) is provided with an elastically deformable aluminum plate cylinder (47), the ends of the push rod (45) are supported on the inner wall of the aluminum plate cylinder (47), and a roller is provided on the spring rod (46), and the roller rolls and contacts the inner wall of the aluminum plate cylinder (47); A rotating shaft (5) is relatively rotatably arranged in the shaft cylinder (42), a connecting shaft (51) is fixed on the rotating shaft (5), and a supporting rod (52) is connected to each of the top rods (45) in the guide shaft sleeve (43), and one end of the supporting rod (52) is hinged to the connecting shaft (51); An internal tooth is fixed on the rotating shaft (5), and a tooth groove is arranged on the push rod (45) located in the second guide shaft sleeve (44), and the internal tooth and the tooth groove are meshed for transmission.

2. A coiling device for throat clamp processing according to claim 1, characterized in that: The pre-bending unit (3) comprises a machine base (31), one side of which is transversely provided with a feeding rack (32), the feeding rack being used to horizontally convey the steel strips one by one, a shaping seat (33) being installed outside the machine base (31) and located on one side of the feeding rack (32), a pressing block (34) being installed in the middle of the machine base (31) and located above the shaping seat (33), an electric telescopic rod being installed on the machine base (31), one end of the electric telescopic rod being connected to the pressing block (34); Two drive plates (35) are transversely arranged on the machine base (31), and the two drive plates (35) are slidably installed at different heights on the machine base (31) through slide rails. A transmission tooth (36) is rotatably connected to the center of the machine base (31), and the transmission tooth (36) is located between the two drive plates (35) and is connected to each of the drive plates (35) for transmission through gear meshing. A mounting frame is fixed on each of the drive plates (35), and a telescopic guide rod (37) is vertically arranged on the mounting frame. A shaping block (38) is installed at the lower end of the telescopic guide rod (37). The mounting frame is also provided with a hydraulic rod, and one end of the hydraulic rod is connected to the telescopic end of the telescopic guide rod (37); the shaping block (38) cooperates with the shaping seat (33) to pre-bend and shape the two ends of the steel belt.

3. A coiling device for throat clamp processing according to claim 2, characterized in that: The lower end surface of the shaping block (38) is in an arc-shaped structure. After the steel strip is pre-bent and shaped, its end is bent in an arc shape. At this time, under the extrusion cooperation of the top pressure block (14) and the shaping block (11), the end of the steel strip can pass through the hoop head and complete the coil shaping.

4. A coiling device for throat clamp processing according to claim 1, characterized in that: The positioning block (22) is located directly above the forming block (11) and is used to position the center of the steel strip on the forming block (11); A pin mechanism is also slidably arranged on one side of the forming block on the fixing frame (21), and the pin mechanism is used to push the coiled steel strip into or out of the flexible expansion and contraction mechanism (4). The flexible expansion and contraction mechanism (4) fully expands and contracts the coiled steel strip internally, so that the steel strip is completely deformed, and the screw assembly condition on the hoop head is checked.

5. The coiling device for throat clamp processing according to claim 1, characterized in that: When the rotating shaft (5) drives the push rod (45) in the guide shaft sleeve (43) to slide outward through the connecting shaft (51) during deflection adjustment, the push rod (45) in the guide shaft sleeve (44) slides inward under the drive of the internal teeth, and at this time, the aluminum plate cylinder (47) outside the shaft ring seat (41) expands in an elliptical shape.

6. A coiling device for throat clamp processing according to claim 4, characterized in that: The fixed frame (21) is horizontally slidably connected to a rack (23), and the fixed frame (21) is coaxially rotatably connected to an external tooth (24) outside the fixed rod, the external tooth (24) is meshed with the rack (23) for transmission, and the shaft ring seat (41) in the flexible expansion and contraction mechanism (4) is fixed to the external tooth (24); the fixed frame (21) is provided with a propulsion cylinder (25), and the propulsion cylinder (25) is connected to one end of the rack (23).

7. A coiling device for throat clamp processing according to claim 6, characterized in that: When the flexible expansion and contraction mechanism (4) completes a single internal expansion and contraction of the steel belt, the propulsion cylinder (25) controls the rack (23) to slide so that the flexible expansion and contraction mechanism (4) can turn. At this time, the automatic screw adjuster (16) abuts against the hoop head on the steel belt to prevent the steel belt from rotating with the flexible expansion and contraction mechanism (4).

8. A coiling device for throat clamp processing according to claim 6, characterized in that: The flexible expansion and contraction mechanism (4) performs at least two internal expansion and contraction operations on the coiled steel strip, and the major axis directions of the two internal expansion and contraction operations are different.

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