Steel bar binding device

Abstract

The invention relates to a steel bar binding device. The device comprises a shell; the wire feeding mechanism is arranged on the shell and comprises a metal wire winding roller for providing metal wires for binding reinforcing steel bars and a wire feeding wheel for guiding the metal wires to advance; the torsion mechanism is mounted in the shell and has a degree of freedom of rotating around a central shaft in the vertical direction; the winding mechanism comprises a winding disc fixedly installed on the lower portion of the twisting mechanism, and two open clamping grooves which are centrosymmetric and can allow the metal wires to penetrate through are formed in the winding disc; and the two sharp mouths are arranged at the bottom of the shell and are configured to be clamped at the cross point of the reinforcing steel bars to be bound from top to bottom. Compared with the prior art, the automatic binding machine can complete automatic binding of cross points of a reinforcing mesh, and can perform circular automatic operation of metal wire feeding, metal wire twisting and cutting and metal wire winding and binding.

Description

Technical Field

[0001] The invention belongs to the technical field of construction machinery and relates to a steel bar binding device. Background Art

[0002] Rebar tying is the braiding and fixing of the steel structure in the early stage of construction to facilitate the pouring of concrete. At the same time, it also bears more tensile stress in the building structure, which ensures the strength of the building structure to a certain extent. As an important part of modern construction projects, the construction process and construction technology level of steel bars have an important impact on the construction efficiency and quality of construction projects. With the rapid development of the construction industry, the scale of construction and construction tasks have increased rapidly, and the amount of steel tying projects has also increased accordingly.

[0003] Traditionally, steel bar tying is a manual process, with steel bar workers using tools such as wire, hooks and pliers to tie the steel bars. However, the quality of manually tied steel bars is unstable and there are uncertainties. At the same time, the tying efficiency is low, the labor intensity is high, and it will cause serious damage to the health of workers.

[0004] For example, CN201610843378.7 discloses an automatic steel bar binding machine, which includes a frame, and a wire binding disc mechanism, a power mechanism, a wire feeding mechanism, a wire cutting mechanism, a jaw and a guide mechanism, a wire bending mechanism, and a wire twisting mechanism respectively arranged on the frame. The device essentially requires pure manual operation, and has problems such as poor binding consistency and accuracy, high labor intensity, and may cause repetitive strain injuries to the operator; secondly, since the device requires manual operation, it cannot be adapted to be installed on a mechanical arm to realize electric full-automatic binding; in addition, each mechanism component adopts a decentralized design, with a large number of components and a low degree of structural integration, which may affect the overall stability and reliability. Summary of the invention

[0005] The purpose of the present invention is to provide a steel bar binding device that can complete the automatic or semi-automatic binding of the intersection of the steel mesh, and can perform the cyclic automatic operations of wire feeding, wire twisting and cutting, and wire winding and binding.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A steel bar binding device, comprising:

[0008] shell;

[0009] A wire feeding mechanism disposed on the housing comprises a wire winding roller for providing metal wire for tying the steel bars, and a wire feeding wheel for guiding the metal wire to move forward;

[0010] A torsion mechanism is installed in the housing and has the freedom to rotate around a central axis in a vertical direction;

[0011] The winding mechanism comprises a winding disc fixedly mounted at the lower part of the torsion mechanism, and the winding disc is provided with two centrally symmetrical opening slots for the metal wire to pass through;

[0012] Two pointed nozzles installed at the bottom of the shell are configured to be clamped at the intersection of the steel bars to be tied from top to bottom.

[0013] Furthermore, the torsion mechanism includes a torsion bracket, a torsion drive assembly for driving the torsion bracket to rotate, and a wire cutting blade and a guide roller group arranged in sequence on the torsion bracket along the direction of travel of the metal wire. The winding disk is fixedly installed below the torsion bracket, the wire cutting blade is configured to cooperate with the rotation of the torsion bracket to cut the metal wire, and the guide roller group is configured to guide the metal wire fed through the wire feeding wheel to continue moving in the direction of the open slot.

[0014] Furthermore, the guide roller group includes three parallel guide rollers with different heights and capable of rotation, which are divided into a left guide roller, a middle guide roller and a right guide roller. When the metal wire moves, it passes through the space between the right guide roller and the middle guide roller, and the space between the middle guide roller and the left guide roller in sequence, and is guided to continue moving toward the open slot.

[0015] More preferably, each guide roller is composed of two sections of cylindrical roller bodies with conical or truncated cone-shaped ends, and a smooth groove is formed between the two sections of the cylindrical roller bodies to ensure that the metal wire passing through the guide roller will not deviate in the horizontal direction.

[0016] Furthermore, a guide groove for preventing deviation is processed in the area between the guide roller group and the open slot on the inner wall of the shell.

[0017] Furthermore, the torsion drive assembly includes a reduction motor, and a coupling, a thrust bearing and a connecting spindle that are transmission-connected to the reduction motor.

[0018] Furthermore, two pointed nozzles are arranged opposite to each other at the bottom of the shell, and each pointed nozzle has a guide channel with two ends penetrating and one side wall having an arc-shaped side wall. The upper end opening of the guide channel is opposite to the opening slot, and the arc shape of the side wall of the guide channel satisfies that when the metal wire coming out of the opening slot is guided by the guide channel, it can stably extend into the guide channel of the other opposite pointed nozzle.

[0019] Furthermore, the height of the pointed mouths in the vertical direction satisfies that: when the steel bars to be tied are inserted between the two pointed mouths, sufficient space is left below the pointed mouths for the metal wire extending through the guide channel to pass under the steel bars to be tied.

[0020] Furthermore, the width of the open slot gradually decreases from the opening to the inner end.

[0021] Furthermore, the shell is provided with a wire feeding inlet and a wire feeding outlet, wherein the wire feeding inlet faces the wire feeding wheel, and the wire feeding outlet is located on the other side opposite to the wire feeding inlet.

[0022] Furthermore, a second guiding mechanism and a wire pressing mechanism are also provided in the shell. The second guiding mechanism is located in the area between the wire feeding outlet and the open slot on the different side thereof, and is configured to guide the metal wire that re-enters the shell through the pointed mouth and the open slot to come out from the wire feeding outlet.

[0023] Furthermore, the wire pressing mechanism is used to fix the free end of the metal wire onto the pressing housing or the torsion mechanism.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] (1) Integrated structural design: The steel bar tying device of the present invention integrates the four key mechanisms of wire feeding, twisting, wire cutting and winding into a complete structural unit through an integrated design concept. Compared with the traditional decentralized design, it not only reduces the number of components and simplifies the assembly process, but also improves the overall stability and reliability. This design optimizes the spatial layout of the tying gun, makes the tying process smoother, reduces the mechanical failure rate, and improves the convenience of maintenance.

[0026] (2) Accurate winding mechanism: The winding mechanism design of the lashing device of the present invention can ensure the accuracy and consistency of the metal wire during the winding process. Through the specific slot design on the winding mechanism, the metal wire is subjected to uniform radial force during winding, thereby achieving a high-quality lashing effect. This improvement significantly improves the lashing quality, reduces structural weaknesses caused by uneven winding, and enhances the overall stability of the building structure.

[0027] (3) Efficient working performance: The steel bar tying device of the present invention adopts an efficient working mechanism, and realizes fast and continuous steel bar tying operation through precise mechanical structure design. Compared with traditional manual tying, the present invention can significantly improve the tying speed, reduce the construction time, and ensure the uniformity and consistency of the tying. In addition, the present invention also takes ergonomic design into consideration, reduces the labor intensity of the operator, and improves the working comfort, thereby further improving the overall work efficiency and construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the automatic steel bar binding device and the steel bars of the present invention;

[0029] Figure 2 It is a front view of the automatic steel bar binding device and the steel bars of the present invention;

[0030] Figure 3 It is a side view of the automatic steel bar binding device and the steel bars of the present invention;

[0031] Figure 4 This is a bottom structural view of the automatic steel bar binding device and the steel bars of the present invention;

[0032] Figure 5 It is a cross-sectional view of the internal structure of the automatic steel bar binding device and the steel bars of the present invention;

[0033] Figure 6 It is a cross-sectional view of the automatic steel bar binding device and the steel bar binding process of the present invention, wherein the metal wire is just fed into the binding device;

[0034] Figure 7 The invention is a cross-sectional view of the steel bar automatic tying device and the steel bar tying process, wherein the metal wire has passed around the steel bar intersection node, returned to the tying device, and extended from another outlet;

[0035] Figure 8 It is a cross-sectional view of the steel bar automatic binding device and the steel bar binding process of the present invention, wherein the metal wire is in a reverse tightening state;

[0036] Fig. 9 The specific distribution position of the metal wires of the automatic steel bar tying device of the present invention inside the tying device;

[0037] Fig.10 A bottom view of the torsion device of the automatic steel bar binding device of the present invention;

[0038] Fig.11 It is a schematic diagram of the parts such as the torsion mechanism, the wire cutting mechanism, the roller and the winding device of the automatic steel bar binding device of the present invention;

[0039] Description of the markings in the figure:

[0040] 1-flange; 2-reduction motor; 3-upper cover; 4-upper outer shell; 5-metal wire; 6-metal wire roller; 7-side plate; 8-rebar; 9-lower outer shell; 10-wire feeding wheel; 11-coupling; 12-thrust bearing; 13-connecting spindle; 14-torsion bracket; 15-guide roller; 16-wire cutting blade; 17-winding disk; 18-wire pressing mechanism, 19-opening slot. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0042] In order to make the technical problems to be solved by the present invention clearer, the concept, specific structure and technical effects of the present invention will be clearly and completely described below in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection relationships involved in the patent do not refer to the construction of direct connection, but refer to the formation of a better connection structure by adding or reducing connection aids according to the specific implementation situation. The various technical features in the present invention can be combined interactively without conflicting with each other.

[0043] It should be noted that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate that a device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating relative importance or indicating the number of technical features. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0045] In the following implementation manners or examples, unless otherwise specified, functional components or structures are conventional components or conventional structures used in the art to achieve corresponding functions.

[0046] In addition, several key terms involved in the present invention are first explained and defined: Metal wire: refers to the slender metal wire used for tying steel bars, usually made of steel, with good elasticity and tensile strength. Wire feeding mechanism: refers to the mechanism combination used to transport the metal wire from the wire roll to the binding device. Torsion mechanism: refers to the mechanism combination used to twist the metal wire inside the binding device to assist in completing the binding action; different from the torsion bracket, the torsion bracket is a key part in the torsion mechanism. Wire cutting mechanism: refers to the device combination used to cut the metal wire, which is composed of a wire cutting blade in combination with the binding mechanism and the opening of the outer shell. Winding mechanism: refers to the device combination used to wind the two ends of the metal wire together to complete the binding.

[0047] In order to solve the problems in the automatic binding process of steel bars 8, such as Figures 1 to 9 As shown, the present invention provides a steel bar 8 binding device, comprising:

[0048] shell;

[0049] A wire feeding mechanism disposed on the housing includes a wire reel 6 for providing a metal wire 5 for tying the steel bars 8, and a wire feeding wheel 10 for guiding the metal wire 5 to move forward;

[0050] A torsion mechanism is installed in the housing and has the freedom to rotate around a central axis in a vertical direction;

[0051] The winding mechanism comprises a winding disc 17 fixedly mounted at the lower part of the twisting mechanism, and the winding disc 17 is provided with two centrally symmetrical opening slots 19 for the metal wire 5 to pass through;

[0052] The two pointed nozzles installed at the bottom of the shell are configured to be clamped at the intersection of the steel bars 8 to be tied from top to bottom, and the tying direction of the metal wire 5 is the connection direction of the two pointed nozzles.

[0053] In the present invention, during the binding process, when the sharp mouth of the shell is stuck between two steel bars 8, the top of the sharp mouth needs to contact the steel bars 8 to ensure that there is enough space under the sharp mouth to allow the metal wire 5 to pass thereunder for binding.

[0054] In some specific embodiments, the torsion mechanism includes a torsion bracket 14, a torsion drive assembly that drives the torsion bracket 14 to rotate, and a wire cutting blade 16 and a guide roller group that are sequentially arranged on the torsion bracket 14 along the traveling direction of the metal wire 5. The winding disk 17 is fixedly installed below the torsion bracket 14. The wire cutting blade 16 is configured to cooperate with the torsion bracket 14 to rotate to cut the metal wire 5. The guide roller group is configured to guide the metal wire 5 fed through the wire feeding wheel 10 to continue to move toward the opening slot 19.

[0055] In a more specific embodiment, the guide roller group includes three parallel guide rollers with different heights and capable of rotation, which are divided into a left guide roller, a middle guide roller and a right guide roller. Specifically, Figure 6 The height relationship of the three guide rollers satisfies: right guide roller>left guide roller>middle guide roller, so that when the metal wire 5 moves, it passes through the space between the right guide roller and the middle guide roller, and the space between the middle guide roller and the left guide roller in sequence, and is guided to continue moving toward the open card slot 19. In order to further improve the guiding effect of the metal wire 5, the area between the guide roller group and the open card slot 19 on the inner wall of the shell is also processed with a guide groove for anti-deflection, so that the metal wire 5 coming out of the guide roller will then smoothly enter the subsequent open card slot 19 and the sharp mouth under the guiding effect of the guide groove.

[0056] More preferably, each guide roller is composed of two sections of cylindrical roller bodies with conical or truncated cone-shaped ends, and a smooth groove is formed between the two sections of the cylindrical roller bodies to ensure that the metal wire 5 passing through the guide roller will not deviate in the horizontal direction.

[0057] In a more specific implementation, the torsion drive assembly includes a reduction motor 2 , and a coupling 11 , a thrust bearing 12 , and a connecting spindle 13 that are transmission-connected to the reduction motor 2 .

[0058] In some specific embodiments, two pointed nozzles are arranged opposite to each other at the bottom of the shell, and each pointed nozzle has a guide channel with two ends penetrating and a curved side wall on one side. The upper end opening of the guide channel faces the opening slot 19, and the arc shape of the side wall of the guide channel satisfies: when the metal wire 5 coming out of the opening slot 19 is guided by the guide channel, it can be bent into a specific curvature, so that it can stably extend into the guide channel of the other opposite pointed nozzle.

[0059] In a more specific embodiment, the height of the pointed mouths along the vertical direction satisfies that: when the steel bar 8 to be tied is inserted between the two pointed mouths, sufficient space is left under the pointed mouths for the metal wire 5 extending through the guide channel to pass under the steel bar 8 to be tied.

[0060] In some specific implementations, the width of the opening slot 19 gradually decreases from the opening to the inner end.

[0061] In some specific embodiments, a wire feeding inlet and a wire feeding outlet are provided on the housing, wherein the wire feeding inlet faces the wire feeding wheel 10, and the wire feeding outlet is located on the other side opposite to the wire feeding inlet.

[0062] In a more specific embodiment, a second guiding mechanism and a wire pressing mechanism 18 are further provided in the housing. The second guiding mechanism is located between the wire feeding outlet and the opening slot 19 on the different side thereof, and is configured to guide the metal wire 5 re-entering the housing through the tip and the opening slot 19 to come out of the wire feeding outlet. Here, the second guiding mechanism may be included on the torsion bracket 14 and

[0063] In a more specific embodiment, the wire pressing mechanism 18 is used to fix the free end of the metal wire 5 onto the pressing housing or the torsion mechanism.

[0064] The above embodiments may be implemented individually or in any combination of two or more.

[0065] The above implementation is described in more detail below with reference to specific examples.

[0066] Embodiment 1:

[0067] In order to solve the problems in the automatic binding process of steel bars 8, such as Figures 1 to 9 As shown, this embodiment provides a steel bar 8 binding device, including:

[0068] The housing is divided into an upper housing 4 and a lower housing 9. The upper housing 4 can be installed with structures such as a flange 1, a reduction motor 2, a coupling 11, and a matching upper cover 3, and the lower housing 9 can be installed with structures such as a torsion bracket 14, a beak, and a winding disk 17;

[0069] A wire feeding mechanism is provided on the housing through a side plate 7, and includes a wire winding roller 6 for providing a metal wire 5 for tying a steel bar 8, and a wire feeding wheel 10 for guiding the metal wire 5 to move forward;

[0070] A torsion mechanism is installed in the housing and has the freedom to rotate around a central axis in a vertical direction;

[0071] The winding mechanism comprises a winding disc 17 fixedly mounted at the lower part of the torsion mechanism, and the winding disc 17 is provided with two centrally symmetrical open slots 19 for the metal wire 5 to pass through, and the spacing between the two open slots 19 is determined according to the size and requirements of the steel bars 8 to be tied;

[0072] The two pointed nozzles installed at the bottom of the shell are configured to be clamped at the intersection of the steel bars 8 to be tied from top to bottom, and the tying direction of the metal wire 5 is the connection direction of the two pointed nozzles.

[0073] The specific process of the steel bar 8 binding device provided in this embodiment is as follows:

[0074] refer to Figures 1 to 4 When the binding device is performing binding work, it can be connected to a robotic arm or an extended handle through the top flange 1 to realize robot automation or semi-manual operation. The robotic arm or manual operation places the binding device at the intersection of the steel bars 8 that need to be bound. The lower shell 9 of the binding device has a claw-shaped sharp mouth, which can be stuck at the intersection of the steel bars 8 from top to bottom to maintain stability. The binding direction of the metal wire 5 is the direction of the connection line of the two sharp mouths. It should be noted that when the sharp mouth of the lower shell 9 is stuck between the two steel bars 8, the top of the sharp mouth needs to contact the steel bars 8, so that there is enough space at the bottom of the sharp mouth to allow the metal wire 5 to pass through the steel bars 8.

[0075] refer to Figure 5 , Figure 6, the metal wire 5 extends from the metal wire reel 6 and is located near the entrance of the wire feeding wheel 10. The wire feeding wheel 10 drives the metal wire 5 from the opening of the lower shell 9 into the interior of the binding device under the action of friction and clamping, and passes by a wire cutting blade 16, but no cutting is performed at this time. Subsequently, the metal wire 5 passes through three guide rollers 15, which are divided into a left guide roller, a middle guide roller and a right guide roller, and bypasses the three guide rollers 15 from the bottom, top and bottom respectively. Its operating principle is similar to that of a wire looping machine. Since the roller structure is composed of two sections of cylindrical roller bodies with conical or truncated cone-shaped ends, the position of the metal wire 5 will be limited to the smooth groove at the intersection of the roller bodies to ensure that the metal wire 5 does not deviate in the horizontal direction. Under the combined action of bending deformation and guiding structure, the metal wire 5 is bent into a specific arc and continues to move toward the intersection of the steel bars 8 in an arc shape.

[0076] refer to Figure 7 The metal wire 5 moves along the inner wall of one of the sharp mouths of the lower shell 9 (i.e., the side wall of the guide channel) in an arc-shaped motion trajectory, bypasses the steel bar 8, returns to the other sharp mouth, and enters the inside of the binding device. In order to further ensure the controllability of the trajectory of the metal wire 5 when it returns to the inside of the lower shell 9, another set of centrosymmetrical guide rollers is provided on the torsion bracket 14. At the same time, a guide groove between the sharp mouth and the guide roller group can be processed on the inner wall of the lower shell 9, so that the metal wire 5 returning to the lower shell 9 can be guided by the guide groove and then turned and continued to move to the wire feeding outlet of the lower shell 9. During the entire wire feeding process, the part connected to the metal wire reel 6 is the fixed end of the metal wire 5, and the other end is the free end.

[0077] refer to Figure 8 After the metal wire 5 has gone around once, it extends out from another opening (i.e., the wire feeding outlet) of the lower housing 9. The extension is to ensure that the metal wire 5 has completely gone around the binding node of the steel bar 8 and to ensure that the metal wire 5 has enough binding length. It is worth noting that a wire pressing mechanism 18 (located on the controllable travel path of the metal wire 5) is provided in the lower housing 9 near the free end of the metal wire 5. It can be set as an electric push rod to fix the free end of the metal wire 5. Then the wire feeding wheel 10 and the metal wire winding roller 6 rotate in the opposite direction to tighten the metal wire 5 in the opposite direction.

[0078] refer to Fig. 9 After the metal wire 5 is reversely tightened, the free end and the fixed end of the metal wire 5 near the steel bar 8 will enter the open slot 19 of the winding disk 17 due to deformation. The opening of the open slot 19 of the winding disk 17 is larger and the inside gradually shrinks. Even if the position of the metal wire 5 deviates each time, it will enter the open slot 19 of the winding disk 17 when tightening, thereby improving the fault tolerance rate.

[0079] refer to Fig.10After the metal wire 5 is reversely tightened and enters the open slot 19 of the winding disk 17, the structure composed of the thrust bearing 12, the torsion bracket 14, the guide roller group, the wire cutting blade 16 and the winding disk 17 rotates under the drive of the reduction motor 2. Since the two ends of the metal wire 5 are close to the wire cutting blade 16, the wire cutting blade 16 and the lower housing 9 jointly cut the two ends of the metal wire 5 under the action of the motor torque. As the torsion continues, the two slots of the winding disk 17 will wind the two ends of the metal wire 5 into a spiral shape, and the metal wire 5 close to the steel bar 8 will be tightened, completing the binding action.

[0080] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A steel bar tying device, characterized in that: include: shell; A wire feeding mechanism disposed on the housing comprises a wire winding roller for providing metal wire for tying the steel bars, and a wire feeding wheel for guiding the metal wire to move forward; A torsion mechanism is installed in the housing and has the freedom to rotate around a vertical central axis; The winding mechanism comprises a winding disc fixedly mounted at the lower part of the torsion mechanism, and the winding disc is provided with two centrally symmetrical opening slots for the metal wire to pass through; Two pointed nozzles installed at the bottom of the shell are configured to be clamped at the intersection of the steel bars to be tied from top to bottom.

2. A steel bar tying device according to claim 1, characterized in that: The torsion mechanism includes a torsion bracket, a torsion drive assembly for driving the torsion bracket to rotate, and a wire cutting blade and a guide roller group arranged in sequence on the torsion bracket along the direction of travel of the metal wire. The winding disk is fixedly installed below the torsion bracket. The wire cutting blade is configured to cooperate with the rotation of the torsion bracket to cut the metal wire. The guide roller group is configured to guide the metal wire fed through the wire feeding wheel to continue to move toward the open slot.

3. A steel bar tying device according to claim 2, characterized in that: The guide roller group includes three parallel guide rollers with different heights and capable of rotation, which are divided into a left guide roller, a middle guide roller and a right guide roller. When the metal wire moves, it passes through the space between the right guide roller and the middle guide roller, and the space between the middle guide roller and the left guide roller in sequence, and is guided to continue moving toward the open slot.

4. A steel bar tying device according to claim 3, characterized in that: Each guide roller is composed of two sections of cylindrical roller bodies with conical or truncated cone-shaped ends, and a smooth groove is formed between the two sections of the cylindrical roller bodies to ensure that the metal wire passing through the guide roller will not deviate in the horizontal direction.

5. A steel bar tying device according to claim 2, characterized in that: A guide groove for preventing deviation is processed in the area between the guide roller group and the open slot on the inner wall of the shell.

6. A steel bar tying device according to claim 2, characterized in that: The torsion drive assembly includes a reduction motor, and a coupling, a thrust bearing and a connecting spindle that are transmission-connected to the reduction motor.

7. A steel bar tying device according to claim 1, characterized in that: Two pointed nozzles are arranged opposite to each other at the bottom of the shell, and each pointed nozzle has a guide channel with two ends penetrating and a side wall with an arc shape. The upper end opening of the guide channel faces the opening slot, and the arc shape of the side wall of the guide channel satisfies: when the metal wire coming out of the opening slot is guided by the guide channel, it can stably extend into the guide channel of the other opposite pointed nozzle.

8. A steel bar tying device according to claim 7, characterized in that: The height of the pointed mouths in the vertical direction satisfies that when the steel bars to be tied are inserted between the two pointed mouths, sufficient space is left below the pointed mouths for the metal wire extending through the guide channel to pass under the steel bars to be tied.

9. A steel bar tying device according to claim 1, characterized in that: The width of the opening slot gradually decreases from the opening to the inner end.

10. A steel bar tying device according to claim 1, characterized in that: The housing is provided with a wire feeding inlet and a wire feeding outlet, wherein the wire feeding inlet faces the wire feeding wheel, and the wire feeding outlet is located on the other side opposite to the wire feeding inlet; A second guiding mechanism and a wire pressing mechanism are also provided in the housing. The second guiding mechanism is located between the wire feeding outlet and the opening slot on the different side thereof, and is configured to guide the metal wire re-entering the housing through the pointed mouth and the opening slot to come out of the wire feeding outlet. The wire pressing mechanism is used to fix and press the free end of the metal wire onto the housing or the torsion mechanism.

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