A steel bar twisting mechanism and steel bar bundling machine

Abstract

The present invention discloses a steel bar twisting mechanism and a steel bar bundling machine, the mechanism comprises a transmission rod assembly, a twisting wire body and a twisting claw; the transmission rod assembly is partially sleeved inside the twisting wire body, the transmission rod assembly comprises a core shaft, a compression spring, a pull sleeve and a clamping plate, the compression spring is sleeved on the core shaft, and one end of the compression spring is fixed on the core shaft, and the other end of the compression spring contacts the end face of the pull sleeve; a countersunk hole is provided on the end face of the pull sleeve, one end of the core shaft cooperates with the countersunk hole on the end face of the pull sleeve, a mounting hole is provided on the circumference of the pull sleeve, the clamping plate is mounted on the mounting hole and protrudes from the inner cylindrical surface of the countersunk hole on the end face of the pull sleeve, the present invention improves the twisting wire mechanism through various structural improvements, the overall operation is smoother, and the abnormal influence caused by the problem of the twisting wire mechanism is avoided, thereby improving the quality and life of the steel bar bundling machine as a whole.

Description

Technical Field

[0001] The invention relates to the field of steel bar bundling, in particular to a steel bar twisting mechanism and a steel bar bundling machine. Background Art

[0002] The steel bar tying machine ties the cross position of the steel bars by placing the tying area of ​​the steel bar tying machine at the cross position of the steel bars, and installing the iron wire of the wire coil in the steel bar tying machine. The iron wire is sent out through the wire feeding mechanism of the steel bar tying machine, guided by the guide mechanism of the steel bar tying machine, and the iron wire is looped around the cross position of the steel bars through the forming mechanism of the steel bar tying machine. The wire twisting mechanism of the steel bar tying machine holds and twists the wire loop until the cross position of the steel bars is tightly tied by the iron wire, and at the same time, the cutting mechanism of the steel bar tying machine cuts off the end of the iron wire.

[0003] When using the steel bar bundling machine, the above-mentioned actions need to be repeated frequently, which places extremely high demands on the service life of the steel bar bundling machine, especially the wire twisting mechanism of the steel bar bundling machine as a mechanism for tightening the wire. The steel bar bundling machine in the prior art has the following disadvantages:

[0004] 1. The spring is limited in size and cannot provide sufficient elastic force, thus affecting the coiling of the wire;

[0005] 2. The sleeve processing and assembly requirements are high, which will affect the yield rate of the torsion mechanism;

[0006] 3. The assembly of the torsion wire mechanism is unstable, and long-term use will damage the quality of the torsion wire mechanism;

[0007] 4. Due to the defects in the design of the chuck body structure, during the complex wire twisting process, the contact part between the chuck body and the wire twisting claws is prone to breakage, resulting in damage to the wire twisting mechanism.

[0008] Due to the above reasons, automatic steel bar bundling machines have not been promoted and popularized.

[0009] Therefore, the existing automatic steel bar binding machine still needs further improvement and innovation. Summary of the invention

[0010] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a steel bar twisting mechanism and a steel bar bundling machine to ensure smooth transmission of the twisting mechanism during frequent use, greatly improve the life of the twisting mechanism of the steel bar bundling machine, and thus improve the service life of the steel bar bundling machine as a whole.

[0011] One object of the present invention is achieved by the following technical solution: comprising a transmission rod assembly, a torsion wire body and a torsion claw, wherein the transmission rod assembly is partially sleeved inside the torsion wire body;

[0012] The transmission rod assembly comprises a core shaft, a spring, a pull sleeve and a clamping plate, wherein the spring is sleeved on the core shaft, and one end of the spring is fixed on the core shaft, and the other end of the spring is in contact with the end surface of the pull sleeve;

[0013] The end face of the pull sleeve is provided with a countersunk hole, one end of the core shaft cooperates with the countersunk hole on the end face of the pull sleeve, a mounting hole is provided on the circumference of the pull sleeve, the clamping plate is installed on the mounting hole, and the clamping plate protrudes from the inner cylindrical surface of the countersunk hole on the end face of the pull sleeve.

[0014] Furthermore, the core shaft includes a threaded section, a positioning cylinder, a transition cylinder, a step cylinder and a supporting cylinder, the threaded section is arranged on the circumference of the supporting cylinder, the step cylinder cooperates with the countersunk hole on the end face of the pulling sleeve, the transition cylinder is arranged between the positioning cylinder and the step cylinder, and the diameter of the transition cylinder is smaller than the diameter of the step cylinder.

[0015] Furthermore, the spring comprises a small spring end and a large spring end, the small spring end is sleeved on the positioning cylinder, and the large spring end is in contact with the end surface of the pull sleeve.

[0016] Furthermore, the torsion wire body includes a torsion wire sleeve, a cam, a tooth plate and a fastening screw. The inner hole of the torsion wire sleeve is set as a stepped countersunk hole, the cam is set in the stepped countersunk hole of the inner hole, the outer surface of the cam is provided with an embedded hole, the tooth plate is installed in the embedded hole, the tooth plate is spirally matched with the threaded segment, and the torsion wire sleeve and the cam are fixed by the fastening screw.

[0017] Furthermore, the torsion sleeve is provided with a threaded hole, the cam is provided with a countersunk hole corresponding to the threaded hole, and the fastening screw fixes the torsion sleeve and the cam by connecting the threaded hole and the countersunk hole.

[0018] Furthermore, the cam is provided with a positioning protrusion, the torsion sleeve is provided with a positioning groove, and the positioning protrusion cooperates with the positioning groove.

[0019] Furthermore, a positioning plane for circumferential positioning is provided at one end of the inner hole of the torsion sleeve, and an avoidance plane is provided on the pulling sleeve, and the positioning plane matches the avoidance plane.

[0020] Furthermore, the twisting claw comprises a connecting plate and a claw head, one end of the connecting plate is provided with a sliding cylinder, the other end of the connecting plate is connected to the claw head, and the connecting plate is also provided with a latch hole;

[0021] One end of the pull sleeve is provided with a first mounting groove and a slide groove which are interconnected, and the sliding cylinder is installed in the slide groove through the first mounting groove;

[0022] The torsion wire sleeve is also provided with a positioning hole corresponding to the plug hole, and the plug hole and the positioning hole are connected by a plug.

[0023] Furthermore, the pulling sleeve is provided with a second mounting groove, and the twisting sleeve is provided with a notch, and the second mounting groove and the notch are both used for plane positioning of the connecting plate.

[0024] Another object of the present invention is achieved through the following technical solution: the steel bar bundling machine includes the steel bar twisting mechanism as described above.

[0025] Compared with the prior art, the present invention has the following advantages and effects:

[0026] 1. The torsion wire mechanism sets the spring on the positioning cylinder of the core shaft, so that the spring has sufficient size space and can be reasonably designed and structurally optimized.

[0027] 2. When the torsion mechanism is in the gripping state, the pulling sleeve is translated to the position closest to the tooth plate, and at least one circle of the large end of the spring remains in the inner hole of the torsion sleeve. This can prevent the transmission rod assembly from moving axially in the torsion body, and prevent the torsion mechanism from moving unsmoothly due to the uneven end surface of the stepped inner hole of the torsion sleeve.

[0028] 3. When the torsion wire mechanism is in the resetting process, the avoidance plane of the pull sleeve is not only used to transmit the friction force of resetting, but also saves the circumferential dimension of the pull sleeve and leaves space for the positioning hole of the torsion wire sleeve, so that the structural design of the torsion wire mechanism is simplified to a certain extent, and provides support for the overall size and weight limit of the torsion wire mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional view of the twisting wire mechanism of an embodiment of the present invention in an open state;

[0030] Figure 2 is a top view of the twisting wire mechanism in an open state according to an embodiment of the present invention;

[0031] Figure 3 is a cross-sectional view of a state where a wire twisting mechanism according to an embodiment of the present invention holds a wire;

[0032] Figure 4 is a top view of the wire twisting mechanism of the embodiment of the present invention holding the wire;

[0033] Figure 5 is a cross-sectional view of a transmission rod assembly in a torsion wire mechanism according to an embodiment of the present invention;

[0034] Figure 6 is a top view of a transmission rod assembly in a torsion wire mechanism according to an embodiment of the present invention;

[0035] Figure 7is an exploded view of a transmission rod assembly in a torsion wire mechanism according to an embodiment of the present invention;

[0036] Figure 8 is a cross-sectional view of a wire twisting body in a wire twisting mechanism according to an embodiment of the present invention;

[0037] Fig. 9 is a top view of a torsion wire body in a torsion wire mechanism according to an embodiment of the present invention;

[0038] Fig.10 is an exploded view of a wire twisting body in a wire twisting mechanism according to an embodiment of the present invention;

[0039] Fig.11 yes Fig. 9 K-direction schematic diagram of the middle torsion wire sleeve;

[0040] Fig.12 It is a schematic structural diagram of a twisting claw in a twisting wire mechanism according to an embodiment of the present invention;

[0041] Fig.13 It is a schematic diagram of the structure of the tooth plate in the twisting mechanism of an embodiment of the present invention.

[0042] Among them, in the embodiment of the present invention: 41, transmission rod assembly; 42, torsion wire body; 43, torsion claw; 44, latch; 411, mandrel; 412, spring; 413, pull sleeve; 414, clamping plate; 421, torsion wire sleeve; 422, cam; 423, tooth plate; 424, fastening screw; 411A, threaded section; 411B, positioning cylinder; 411C, transition cylinder; 411D, step cylinder; 411E, support cylinder; 412A, small end of spring; 412B, large end of spring; 413A, slide groove; 413B, first installation groove; 413C , avoidance plane; 413D, second mounting groove; 413E, end face of pull sleeve; 413F, mounting hole; 421A, positioning hole; 421B, inner hole; 421C, notch; 421D, threaded hole; 421G, positioning groove; 421H, positioning plane; 421K-end face of stepped inner hole of torsion sleeve; 422A, inlaid hole; 422B, support hole; 422C, positioning protrusion; 422D, countersunk hole; 423A, guide angle; 423B, screw thread; 43A, connecting plate; 43B, sliding cylinder; 43C, pin hole; 43D, claw head. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0044] The life of the torsion wire mechanism of the steel bar bundling machine is directly related to the service life of the steel bar bundling machine. In view of the shortcomings of the existing torsion wire mechanism, the embodiment of the present invention provides a torsion wire mechanism to avoid the problems existing in the use of the existing torsion wire mechanism, ensure the smooth transmission of the torsion wire mechanism in frequent use, greatly improve the life of the torsion wire mechanism of the steel bar bundling machine, thereby improving the service life of the steel bar bundling machine as a whole.

[0045] Specifically, Figures 1 to 4 As shown, the twisting wire mechanism of the steel bar bundling machine includes a transmission rod assembly 41, a twisting wire body 42 and a twisting claw 43, wherein the transmission rod assembly 41 is partially sleeved in the twisting wire body 42, and the twisting claw 43 is fixed to one end of the transmission rod assembly 41. The twisting claw 43 can be opened and hold the wire through the rotation of the transmission rod assembly 41.

[0046] In the embodiments of this specification, Figures 5 to 7 As shown, the transmission rod assembly 41 includes a core shaft 411 , a spring 412 , a pull sleeve 413 and a clamping plate 414 .

[0047] The spring 412 of the transmission rod assembly 41 is sleeved on the positioning cylinder 411B of the core shaft 411. Specifically, the spring 412 is a conical helical compression spring. The spring 412 has a small spring end 412A, which is sleeved on the positioning cylinder 411B of the core shaft, and the small spring end 412A contacts the shoulder step surface of the positioning cylinder 411B. The spring 412 has a large spring end 412B, which contacts the end surface 413E of the pull sleeve 413.

[0048] The spring 412 is arranged on the positioning cylinder 411B of the core shaft 411, rather than being placed in the countersunk hole of the end face 413E of the pull sleeve 413, so that the spring 412 has sufficient size space, and the spring 412 can be reasonably designed and structurally optimized. At the same time, the spring 412 is no longer restricted by the structural design and load limit, which can greatly extend the life of the spring, thereby improving the life of the torsion wire mechanism 4 and even the steel bar bundling machine.

[0049] At the same time, a countersink is provided on the end face 413E of the pull sleeve 413, and the step cylinder 411D on the mandrel 411 cooperates with the countersink on the end face 413E. A connecting transition cylinder 411C is provided between the positioning cylinder 411B and the step cylinder 411D, and the diameter of the connecting transition cylinder 411C is smaller than that of the step cylinder 411D.

[0050] A mounting hole 413F is provided on the circumference of the pull sleeve 413, and the clamping plate 414 is installed on the mounting hole 413F and protrudes from the inner cylindrical surface of the countersunk hole on the end face 413E of the pull sleeve 413. Its function is to keep the axial connection between the pull sleeve 413 and the core shaft 411 inseparable and to ensure that the spring 412 is in a compressed state.

[0051] like Figures 8 to 11 As shown, the torsion wire body 42 includes a torsion wire sleeve 421, a cam 422, a tooth plate 423 and a fastening screw 424. The cam 422 has an inlay hole 422A for installing the tooth plate 423. The assembly of the cam 422 and the tooth plate 423 is installed in the stepped countersunk hole of the torsion wire sleeve 421.

[0052] Specifically, the inner hole 421B of the torsion sleeve 421 is designed with a stepped countersunk hole, and the stepped countersunk hole cooperates with the outer cylindrical surface of the cam 422 , and is positioned through the end face 421K of the stepped inner hole of the torsion sleeve 421 .

[0053] The cam 422 is provided with a positioning protrusion 422C which cooperates with the positioning groove 421G on the torsion sleeve 421, so as to facilitate the rapid installation of the cam 422 and the torsion sleeve 421 and play the role of transmitting torque at the same time.

[0054] At the same time, a threaded hole 421D is provided on the cylindrical surface of the torsion sleeve 421 , which is opposite to the countersunk hole 422D provided on the outer cylindrical surface of the cam 422 , and the torsion sleeve 421 and the cam 422 are fastened together by a fastening screw 424 .

[0055] The assembled torsion wire body 42 has an inner hole 42A, and the transmission rod assembly 41 is inserted into and installed in the inner hole 42A of the torsion wire body 42, that is, the supporting cylinder 411E of the core shaft 411 cooperates with the supporting hole 422B of the cam 422, and the threaded section 411A of the core shaft 411 can be spirally matched with the tooth plate 423 installed on the cam 422, and the outer circle of the pulling sleeve 413 cooperates with the inner hole 421B of the torsion wire sleeve. At the same time, a countersunk hole is opened on one end of the inner hole 421B of the torsion wire sleeve 421, and the countersunk hole has a positioning plane 421H for circumferential positioning. The pulling sleeve 413 is provided with an avoidance plane 413C that cooperates with the positioning plane 421H of the torsion wire sleeve 421.

[0056] By rotating the mandrel 411, when the threaded section 411A of the mandrel 411 is screwed into the tooth plate 423, the step cylinder 411D of the mandrel 411 drives the clamping plate 414, dragging the pull sleeve 413 to move axially toward the tooth plate 423, and under the action of the positioning plane 421H of the torsion sleeve 421, the pull sleeve 413 performs axial translation relative to the torsion sleeve 421. When the threaded section 411A of the mandrel 411 is screwed out of the tooth plate 423, the shoulder step surface of the positioning cylinder 411B of the mandrel 411 supports the spring 412, and relies on the elastic force provided by the spring 412 to drive the pull sleeve 413 to move axially away from the tooth plate 423.

[0057] The steel bar binding machine is frequently used, and the smoothness of the movement of the torsion wire mechanism 4 is extremely important. If there is a jam or unnecessary impact, it is easy to cause damage to the torsion wire mechanism 4. The torsion wire body 42 of the torsion wire mechanism 4, the cam 422 is installed on the end surface 421K of the stepped inner hole of the torsion wire sleeve 421. Due to the limitations of manufacturing accuracy and other conditions, the position of the torsion wire body 42 on the end surface 421K of the stepped inner hole of the torsion wire sleeve 421 cannot be absolutely smoothly transitioned. Figure 4 As shown, when the torsion wire mechanism 4 is in a gripping state, the pulling sleeve 413 translates to the position closest to the tooth plate 423, and the large end 412B of the spring 412 has at least one circle remaining in the inner hole 421B of the torsion wire sleeve 421. Through the above design, it can be avoided that when the transmission rod assembly 41 moves axially in the torsion wire body 42, the torsion wire mechanism 4 will not move smoothly due to the unevenness of the end face 421K of the stepped inner hole of the torsion wire sleeve 421.

[0058] like Figures 1 to 4 As shown, when the core shaft 411 drives the pulling sleeve 413 to perform translational motion relative to the wire twisting body 42 , the twisting claw 43 of the wire twisting mechanism 4 will be in an open or gripping state.

[0059] During the wire feeding process of the steel bar bundling machine, the core shaft 411 rotates and rotates the tooth plate 423 all the time, that is, the tail end of the threaded section 411A of the core shaft 411 and the thread 423B of the tooth plate 423 are in a rotational slipping state under the elastic force of the spring 412.

[0060] When the steel bar bundling machine completes the twisting of the iron wire and resets it, the core shaft 411 is rotated out of the tooth plate 423, and the spring 412 has sufficient elastic force to drive the pull sleeve 413 to move away from the tooth plate 423. After the twisting wire mechanism 4 completes the gripping and twisting action of the iron wire ring, the pull sleeve 413 needs to have sufficient driving force to make the twisting claw 43 disengage from the iron wire joint head, so that the twisting claw 43 is opened, and relying on the elastic force provided by the spring 412, the core shaft 411 drives the pull sleeve 413, so that the pull sleeve 413 drives the twisting wire body 42, and completes the restoration of the twisting wire body 42 to the twisting claw 43 in the open state.

[0061] In the embodiment of the present specification, the torsion wire body 42 of the torsion wire mechanism 4 is limited by the outer diameter of the torsion wire sleeve 421 and the outer diameter of the threaded section 411A of the mandrel 411. The wall thickness of the cam 422 is limited. When the torsion wire mechanism 4 is running, the tooth plate 423 may overturn, resulting in the inability of the screw thread 423B of the tooth plate 423 to smoothly enter the threaded section 411A of the mandrel 411, and the transmission of the torsion wire mechanism is stuck. Therefore, a guide angle 423A (such as a guide angle 423A) is provided around the main body of the tooth plate 423 to avoid air. Figure 8 and Fig.13 As shown), its function is that when the tooth plate 423 overturns, the wire twisting mechanism 4 can still run smoothly.

[0062] In the embodiments of this specification, Fig.12 As shown, the twisting claw 43 has a connecting plate 43A, and the connecting plate 43A has a sliding cylinder 43B and a latch hole 43C. The large end of the pull sleeve 413 is provided with a first mounting groove 413B. The sliding cylinder 43B of the twisting claw 43 passes through the first mounting groove 413B of the pull sleeve 413 and is installed in the sliding groove 413A of the pull sleeve. The twisting claw 43 has a latch hole 43C that is opposite to the positioning hole 421A of the torsion wire sleeve 421. The latch 44 passes through the positioning hole 421A of the torsion wire sleeve 421 and the latch hole 43C of the twisting claw, so that the twisting claw 43 rotates around the positioning hole 421A.

[0063] A second mounting groove 413D is provided on the pulling sleeve 413, and a notch 421C is provided on the twisting sleeve 421, so as to perform planar positioning on the connecting plate 43A of the twisting claw 43, thereby ensuring that the twisting claw 43 can rotate around the positioning hole 421A. When the twisting mechanism 4 holds the twisted wire, the second mounting groove 413D and the notch 421C can provide support for the connecting plate 43A, thereby ensuring that the twisting claw 43 has sufficient strength when twisting the wire.

[0064] When the mandrel 411 is screwed into the tooth plate 423, the pull sleeve 413 is axially translated toward the tooth plate 423, and the slide groove 413A of the pull sleeve 413 drives the sliding cylinder 43B of the twisting claw 43 to make the twisting claw 43 in a gripping state, such as Figure 4 and Figure 5 shown.

[0065] When the core shaft 411 is rotated out of the tooth plate 423, the pull sleeve 413 is axially translated away from the tooth plate 423, and the sliding groove 413A of the pull sleeve 413 drives the sliding cylinder 43B of the twisting claw 43 to open the twisting claw 43.

[0066] When the wire twisting mechanism 4 completes the wire twisting process and resets, the core shaft 411 drives the pull sleeve 413, so that the pull sleeve 413 drives the wire twisting body 42, and completes the restoration of the wire twisting body 42 to the state where the twisting claws 43 are in the open state. Fig. 9 As shown, the avoidance plane 413C of the pull sleeve 413 is not only used for transmitting the resetting friction force, but the avoidance plane 413C saves the circumferential dimension occupied by the pull sleeve 413, leaving a space dimension for the positioning hole 421A for the torsion wire sleeve 421, so that the structural design of the torsion wire mechanism 4 is simplified to a certain extent, and provides support for the overall size and weight limit of the torsion wire mechanism 4.

[0067] On the basis of the wire twisting mechanism provided above, the embodiment of this specification also provides a steel bar bundling machine, wherein the steel bar bundling machine includes a wire cutting mechanism, a limiting structure and the wire twisting mechanism provided above, the wire twisting mechanism serves as the rotating axis of the parts in the transmission system, and when twisting the wire, the wire twisting mechanism can cooperate with the wire cutting machine to complete the cutting of the iron wire, and the wire twisting mechanism cooperates with the limiting mechanism to complete the above movement during the wire feeding, twisting and resetting process.

[0068] Through the torsion wire mechanism provided in the embodiments of this specification, after various structural improvements, its service life in normal use is almost unlimited, the modified torsion wire mechanism can better realize its functions in each transmission process, the overall operation is smoother, and abnormal effects caused by problems with the torsion wire mechanism are avoided, thereby improving the quality and life of the rebar bundling machine as a whole.

[0069] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A steel bar twisting mechanism, characterized in that: It includes a transmission rod assembly, a torsion wire body and a torsion claw, wherein the transmission rod assembly is partially sleeved inside the torsion wire body; The transmission rod assembly comprises a core shaft, a spring, a pull sleeve and a clamping plate, wherein the spring is sleeved on the core shaft, and one end of the spring is fixed on the core shaft, and the other end of the spring is in contact with the end surface of the pull sleeve; The end surface of the pull sleeve is provided with a countersunk hole, one end of the mandrel cooperates with the countersunk hole on the end surface of the pull sleeve, a mounting hole is provided on the circumference of the pull sleeve, the clamping plate is mounted on the mounting hole, and the clamping plate protrudes from the inner cylindrical surface of the countersunk hole on the end surface of the pull sleeve, and is used to keep the axial connection between the pull sleeve and the mandrel from being disengaged, so that the spring is in a compressed state; The mandrel comprises a threaded section, a positioning cylinder, a transition cylinder, a step cylinder and a supporting cylinder, the threaded section is arranged on the circumference of the supporting cylinder, the step cylinder cooperates with the countersunk hole on the end face of the pull sleeve, the transition cylinder is arranged between the positioning cylinder and the step cylinder, and the diameter of the transition cylinder is smaller than the diameter of the step cylinder; The spring comprises a small spring end and a large spring end, the small spring end is sleeved on the positioning cylinder, and the large spring end is in contact with the end surface of the pull sleeve; The spring of the transmission rod assembly is sleeved on the positioning cylinder of the core shaft. The spring is a conical spiral compression spring, and the small end of the spring contacts the shoulder step surface of the positioning cylinder. The torsion wire body comprises a torsion wire sleeve, a cam, a tooth plate and a fastening screw. The inner hole of the torsion wire sleeve is set as a stepped countersunk hole, the cam is set in the stepped countersunk hole of the inner hole, the outer surface of the cam is provided with an embedded hole, the tooth plate is installed in the embedded hole, the tooth plate is spirally matched with the threaded segment, and the torsion wire sleeve and the cam are fixed by the fastening screw; A countersunk hole is provided on one end of the inner hole of the torsion sleeve, and the countersunk hole has a positioning plane for circumferential positioning. The pull sleeve is provided with an avoidance plane, and the positioning plane matches the avoidance plane. The assembled torsion wire body has an inner hole, the transmission rod assembly is inserted into the inner hole of the torsion wire body, the support cylinder of the mandrel cooperates with the support hole of the cam, the threaded section of the mandrel can be spirally matched with the tooth plate installed on the cam, the outer circle of the pull sleeve cooperates with the inner hole of the torsion wire sleeve, the torsion wire body of the torsion wire mechanism, the cam is installed on the end face of the stepped inner hole of the torsion wire sleeve, when the torsion wire mechanism is in a gripping state, the pull sleeve is translated to the position closest to the tooth plate, and at least one circle of the large end of the spring remains in the inner hole of the torsion wire sleeve; When the wire twisting mechanism completes the wire twisting process and resets, the core shaft drives the pulling sleeve, and the pulling sleeve drives the wire twisting body to complete the restoration of the wire twisting body to the state where the twisting claws are in the open state.

2. The steel bar twisting mechanism according to claim 1, characterized in that: The torsion sleeve is provided with a threaded hole, the cam is provided with a countersunk hole corresponding to the threaded hole, and the fastening screw fixes the torsion sleeve and the cam by connecting the threaded hole and the countersunk hole.

3. The steel bar twisting mechanism according to claim 1, characterized in that: The cam is also provided with a positioning protrusion, the torsion wire sleeve is provided with a positioning groove, and the positioning protrusion matches with the positioning groove.

4. The steel bar twisting mechanism according to claim 1, characterized in that: The twist claw comprises a connecting plate and a claw head, one end of the connecting plate is provided with a sliding cylinder, the other end of the connecting plate is connected to the claw head, and the connecting plate is also provided with a latch hole; One end of the pull sleeve is provided with a first mounting groove and a slide groove which are interconnected, and the sliding cylinder is installed in the slide groove through the first mounting groove; The torsion wire sleeve is also provided with a positioning hole corresponding to the plug hole, and the plug hole and the positioning hole are connected by a plug.

5. The steel bar twisting mechanism according to claim 4, characterized in that: The pulling sleeve is also provided with a second mounting groove, and the twisting sleeve is also provided with a notch. Both the second mounting groove and the notch are used for plane positioning of the connecting plate.

6. A steel bar bundling machine, characterized in that: The steel bar bundling machine comprises the steel bar twisting mechanism according to any one of claims 1 to 5.

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