A reinforcing bar tying device

Abstract

This application relates to the field of rebar bundling technology, aiming to solve the problems of inconsistent tightness and long processing time associated with manual rebar bundling. It provides a rebar bundling device, including a bundling mechanism and a wire feeding mechanism. The bundling mechanism is used to wrap metal wire around bundles of rebar, and the wire feeding mechanism is used to connect the metal wire roll and continuously supply wire to the bundling mechanism. The wire feeding mechanism includes a wire feeding assembly and a servo motor for driving the wire feeding assembly to rotate forward and backward. The servo motor is equipped with an encoder, which automatically calculates the wire feeding length when the wire feeding assembly rotates forward and the wire retraction length when the wire feeding assembly rotates backward. The retraction causes the metal wire to adhere tightly to the surface of the rebar bundle, completing the automatic tightening.

Description

Technical Field

[0001] This application relates to the field of rebar bundling technology, and in particular to a rebar bundling device. Background Technology

[0002] At construction sites where steel bars or sheet metal parts are processed and delivered, after the steel bars or sheet metal parts are cut to length, they need to be bundled together and then hoisted to the storage yard or work area. Currently, the commonly used bundling method is still "single-loop wrapping + manual tightening": workers hold binding wire or metal wire, wrap it around the circumference of the steel bar once, and then use a pry bar or pliers to manually tighten and break the joint. The tightness of the binding wire is entirely dependent on feel, which is not only time-consuming and labor-intensive, but also results in poor bundling quality and low efficiency. Utility Model Content

[0003] In view of the above practical problems and the shortcomings of the existing technology, the main technical problem to be solved by this utility model is to provide a steel bar binding device that can automatically tighten and bind after automatic multi-turn continuous winding.

[0004] To solve the above-mentioned technical problems, this application provides a rebar tying device, which adopts the following technical solution:

[0005] A rebar binding device includes a binding mechanism and a wire feeding mechanism. The binding mechanism is used to wrap metal wire around bundles of rebar, and the wire feeding mechanism is used to connect the metal wire roll and continuously supply wire to the binding mechanism. The wire feeding mechanism includes a wire feeding assembly and a servo motor for driving the wire feeding assembly to rotate forward and backward. The servo motor is equipped with an encoder, which is used to automatically calculate the wire feeding length when the wire feeding assembly rotates forward and the wire retraction length when the wire feeding assembly rotates backward.

[0006] In a preferred embodiment, the wire feeding assembly includes a main transport wheel and two auxiliary transport wheels. The two auxiliary transport wheels are engaged with the main transport wheel at a certain angle. The two auxiliary transport wheels are divided into transport wheel one and transport wheel two, which are arranged sequentially along the transport direction of the metal wire.

[0007] In a preferred embodiment, with the radial perpendicular line of the main transport wheel as a reference, the lines connecting the center of the first transport wheel and the center of the first transport wheel to the center of the main transport wheel form angles a and b, respectively, wherein angle a ranges from 6° to 10° and angle b ranges from 10° to 14°.

[0008] In a preferred embodiment, the meshing surface of the main transport wheel is provided with a first annular groove in the center, and the meshing surface of the auxiliary transport wheel is provided with a second annular groove in the center; both the first and second annular grooves are configured as grooves with a semi-circular cross-section; when the main transport wheel and the auxiliary transport wheel mesh, the first and second annular grooves interlock to form a continuous circular groove structure with a diameter matching the metal wire.

[0009] In a preferred embodiment, the binding mechanism includes a wire inlet, and the wire feeding mechanism further includes a wire guide tube. The wire guide tube is located below the second transport wheel, and the wire guide tube forms a tangential fit with the main transport wheel and the second transport wheel. The wire guide tube is hollow to form a wire feeding channel, and the outlet of the wire guide tube is connected to the wire inlet.

[0010] In a preferred embodiment, the binding mechanism includes a winding assembly. The winding assembly has a circular through hole coaxially disposed at its center for the bundle of reinforcing bars to pass through, and a winding channel is arranged along the outer periphery of the through hole. The winding channel is coaxially arranged with two separate winding channels, namely, a first winding channel and a second winding channel. The first winding channel and the second winding channel are two independent winding channels with a circular arc cross-section. The winding assembly is provided with a circumferential inlet notch, and the inlet and outlet of the first winding channel and the second winding channel converge at the same circumferential inlet notch.

[0011] In a preferred embodiment, the binding mechanism includes a binding assembly, the binding assembly including a rotatable knotting member disposed at the circumferential yarn inlet; the knotting member includes a first channel and a second channel that are independent of each other, the first channel being connected to the inlet of the first yarn path and the second channel being connected to the outlet of the second yarn path; the first channel and the second channel are located at the center of the knotting member and are perpendicularly connected to the yarn path to form a connected structure.

[0012] In a preferred embodiment, the wire outlet end of the winding channel is provided with a first wire guide assembly, the first wire guide assembly including a first wire guide channel and a second wire guide channel; the first wire guide channel is used to misalign the outlet of the first wire guide channel and the inlet of the second wire guide channel; the second wire guide channel is used to connect the second wire guide channel and the second channel.

[0013] In a preferred embodiment, the wire inlet is disposed on the winding member and the wire inlet is in communication with the first channel; the second channel includes a wire retaining hole, which is located below the communication structure.

[0014] In a preferred embodiment, the first wire guide, the second wire guide, the second channel, the first guide wire, and the second guide wire all form an open structure along the direction toward the center of the circular through hole; the first channel is divided into an upper closed structure and a lower open structure along the direction toward the center of the circular through hole.

[0015] In summary, this application has the following beneficial effects:

[0016] 1. This utility model quantifies the "feeding length / retraction length" by setting a servo motor with an encoder, providing a closed-loop control variable for subsequent "multi-turn fixed-length winding + automatic tightening", and completely solves the problems of inconsistent tension and long time consumption caused by manual winding.

[0017] 2. This utility model sets the servo motor to rotate forward, and the encoder accumulates the wire feeding length in real time; after the set number of turns is reached, the motor immediately reverses, the encoder accumulates the retraction amount, and the retraction makes the metal wire stick to the surface of the steel bar bundle, thus completing the automatic tightening. Moreover, the forward and reverse rotation uses the same set of power, eliminating the need for an additional "wire winding motor", resulting in a compact structure and low cost.

[0018] 3. The wire feeding assembly of this utility model forms a “V-shaped meshing” by arranging two auxiliary transport wheels and the main transport wheel at an angle, which automatically centers the metal wire and avoids wire jumping and flattening during high-speed wire feeding; the two wheels contact one after the other to reduce instantaneous flattening deformation.

[0019] 4. This utility model sets two annular grooves, and the semi-circular grooves interlock to form a complete circular hole. The metal wire is evenly stressed around its perimeter, providing sufficient friction to achieve unidirectional wire feeding or rapid retraction. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the rebar tying device in this embodiment;

[0021] Figure 2 This is a schematic diagram of the overall structure of the wire feeding mechanism in this embodiment;

[0022] Figure 3 This is a schematic diagram of the wire feeding assembly and wire guide tube in this embodiment;

[0023] Figure 4 This is a schematic diagram of the wire feeding mechanism in this embodiment, which supplies wire to the binding mechanism.

[0024] Figure 5 This is a schematic diagram of the wire feeding structure of the binding mechanism in this embodiment;

[0025] Figure 6 This is a schematic diagram showing the positional arrangement of the first guide wire assembly, the winding component, and the second guide wire assembly in this embodiment;

[0026] Figure 7 This is a schematic diagram of the winding component of the binding mechanism in this embodiment;

[0027] Figure 8 This is a schematic diagram of the structure of the first guide wire assembly of the binding mechanism in this embodiment;

[0028] Figure 9This is a schematic diagram of the structure of the second guide wire assembly of the binding mechanism in this embodiment;

[0029] Figure 10 This is a schematic diagram of the overall structure of the binding mechanism in this embodiment.

[0030] Explanation of reference numerals in the attached drawings: 1. Wire feeding mechanism; 11. Wire feeding assembly; 111. Main transport wheel; 112. Transport wheel one; 113. Transport wheel two; 114. First annular groove; 115. Second annular groove; 12. Servo motor; 13. Wire guide tube; 2. Bundling mechanism; 21. Winding assembly; 211. Circular through hole; 212. Wire guide one; 213. Wire guide two; 214. Circumferential wire inlet notch; 22. First wire guide group Components; 221, First guide wire channel; 222, Inlet ramp; 223, Second guide wire channel; 224, Offset inlet structure; 23, Bundling assembly; 231, Wrapping component; 2311, First channel; 2312, Second channel; 2313, Wire inlet; 2314, Wire clamping hole; 2315, Third channel; 2316, Connecting structure; 232, Drive motor; 24, Second guide wire assembly; 241, Third guide wire channel. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0032] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0034] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0035] like Figure 1 This embodiment provides a rebar binding device that can be installed as a whole on a binding machine support. The binding device includes a binding mechanism 2 and a wire feeding mechanism 1. The binding mechanism 2 is used to continuously wrap a single metal wire around a bundle of rebars in multiple turns. The wire feeding mechanism 1 is used to connect the metal wire roll and continuously supply wire to the binding mechanism 2. The whole machine is uniformly scheduled by a controller.

[0036] In this embodiment, the binding machine can be an electric forklift with a load capacity of 3 tons. The front suspension of the forklift is used to fix the steel bar binding device, so as to realize the mobile binding function of the steel bar binding mechanism. It can be used to bind bundles of steel bars with a maximum diameter of 600mm.

[0037] like Figure 2 The wire feeding mechanism 1 includes a wire feeding assembly 11 and a servo motor 12 for driving the wire feeding assembly 11. The servo motor 12 is equipped with an encoder. Before bundling, the controller automatically calculates and writes two length parameters, namely: the theoretical total wire consumption length L1 = the circumference of a single turn of the bundling mechanism 2 × the number of winding turns, and the actual length to be retained L2 (i.e. the net wire length required to bundle the steel bars). The net wire length required to bundle the steel bars L2 = the outer circumference of the bundled steel bars × the number of winding turns.

[0038] The wire feeding mechanism 1 includes a wire feeding stage and a tightening stage. During the wire feeding stage, the servo motor 12 rotates forward, and the encoder accumulates the wire feeding length in real time. It stops immediately when the length reaches L1. During the tightening stage, the motor reverses and retracts the wire, and the encoder synchronously records the retraction length. It stops again when the retraction amount equals L1 - L2. By using the "feed to the required length first, then retract" method, the automatic tightening of the metal wire is completed in one go, eliminating the need for manual pry bars and ensuring constant binding tension.

[0039] like Figure 2 The wire feeding assembly 11 includes a main transport wheel 111 and two auxiliary transport wheels. The auxiliary transport wheels mesh with the main transport wheel 111. The main transport wheel 111 is fixed to the output end of the servo motor 12 and is driven to rotate by the servo motor 12, thereby realizing the feeding of metal wire.

[0040] To enable wire feeding and retraction, a first annular groove 114 is centrally located on the meshing surface of the main transport wheel 111, and a second annular groove 115 is centrally located on the meshing surface of the auxiliary transport wheel. Both the first and second annular grooves 114 and 115 are semi-circular grooves. When the auxiliary transport wheel meshes with the main transport wheel 111, the first and second annular grooves 114 and 115 interlock to form a continuous circular groove structure with a diameter matching the tolerance zone of the wire. When the wire enters the circular groove, the first and second annular grooves 114 and 115 clamp the wire using the frictional clamping force of the groove walls. When the servo motor 12 rotates the transport wheel in forward / reverse directions, unidirectional wire feeding or rapid retraction can be achieved.

[0041] To ensure more stable transport of the metal wire and prevent it from slipping out of the wire feeding assembly 11 due to its own tension, such as... Figure 2 Two auxiliary transport wheels are engaged with the main transport wheel 111 at a certain angle. The two auxiliary transport wheels are transport wheel one 112 and transport wheel two 113. Transport wheel one 112 and transport wheel two 113 are arranged sequentially along the transport direction of the metal wire. With the radial perpendicular line of the main transport wheel 111 as the reference, the center of transport wheel one 112 and transport wheel two 113 form angles a and b with the center of the main transport wheel 111, respectively. The angle a ranges from 6° to 10°, and the angle b ranges from 10° to 14°. The arrangement of the two wheels at a certain angle allows the wire to be pre-pressed by transport wheel one 112 at the inlet section and then pressurized by transport wheel two 113 at the outlet section, forming a "gradual tightening" effect.

[0042] The staggered angle arrangement of transport roller 112 and transport roller 213 effectively increases the effective friction arc length between the main transport roller 111 and the metal wire, establishing a stable wire feeding force and preventing wire slippage. The angle 'a' of transport roller 112 is smaller than the angle 'b' of transport roller 213. When retracting in the reverse direction, the rear-positioned transport roller 213 becomes the main pressing side due to the angle direction, providing higher radial pressure than the wire feeding side. This ensures that the retracted wire head has no springback loosening, thus preventing loosening during retraction.

[0043] like Figure 1 The binding mechanism 2 includes a winding assembly 21, a first wire guide assembly 22, and a binding assembly 23. The winding assembly 21 has a circular through-hole 211 coaxially arranged at its center for the bundle of reinforcing bars to pass through. A wire winding channel is coaxially arranged around the outer periphery of the circular through-hole 211, and the wire winding channel communicates with the circular through-hole 211 to feed and complete the winding process. Figure 10The winding channel consists of two independent wire feeding channels with circular arc cross-sections arranged side by side along the axial direction, namely wire feeding channel one 212 and wire feeding channel two 213. The winding assembly 21 is connected to the winding channel and is provided with a circumferential wire inlet notch 214. The circumferential wire inlet notch 214 is used to allow the metal wire to be introduced tangentially along the circumference. The inlet and outlet of the two wire feeding channels converge at the same circumferential wire inlet notch 214 and share the same circumferential wire inlet notch 214, realizing a closed-loop wire feeding with single-entry and single-exit, which can complete wire feeding and winding in one go.

[0044] The two ends of the winding channel are the inlet end and the outlet end, respectively. The first guide assembly 22 is disposed at the outlet end of the winding channel. The first guide assembly 22 includes a first guide channel 221. The inlet of the first guide channel 221 is connected to the outlet of the first guide channel 212, and its outlet is connected to the inlet of the second guide channel 213. Figure 8 The first guide channel 221 includes an inlet inclined surface 222, which is inclined from the outlet of the first guide channel 212 to the inlet of the second guide channel 213. During the two-turn winding of the metal wire, the metal wire can be transferred from the first guide channel 212 to the second guide channel 213 through the first guide channel 221 for staggered winding, so that the metal wire automatically jumps into the second turn after the first turn is completed, realizing continuous two-turn winding of a single wire.

[0045] like Figure 10 The binding assembly 23 includes a winding member 231 and a drive motor 232 for driving the winding member 231 to rotate. The winding member 231 is disposed at the circumferential wire inlet 214. The winding member 231 includes a first channel 2311 and a second channel 2312 that are independently disposed. The two channels are located at the center of the winding member 231 and are perpendicularly connected to each other in the wire feeding direction to form a connecting structure 2316. The first channel 2311 includes a wire inlet 2313. The first channel 2311 is connected to the first wire feeding channel 212 and is used for initial wire drawing. The metal wire introduced by the wire feeding mechanism 1 is introduced through the wire inlet 2313.

[0046] To facilitate the introduction of the metal wire from the wire feeding mechanism 1 into the wire inlet 2313, such as Figure 3 Below the transport ship 113, a guide tube 13 is tangentially fitted to the transport ship. The guide tube 13 is hollow, forming a cable routing channel. The outlet of the guide tube 13 directly connects to the cable inlet 2313. Figure 4 , Figure 5 When the metal wire is led out by the second transport wheel 113, it can be directly guided into the wire guide tube 13 and guided to the wire inlet 2313 along the wire path. The wire guide tube 13 forms a "tangential" transition with the main transport wheel 111 and the second transport wheel 113, eliminating hard bends, so that the high-speed wire feeding still maintains straightness and reduces subsequent winding and jamming.

[0047] like Figure 7The second channel 2312 includes a wire-locking hole 2314, which is located below the connecting structure 2316. The first wire guide assembly 22 also includes a second wire guide channel 223, which is connected to the second wire guide channel 213, and the outlet of the second wire guide channel 223 is connected to the inlet of the second channel 2312. This is used to guide the wire end of the metal wire to the second channel 2312 and lock it in the wire-locking hole 2314 to lock the wire end of the metal wire.

[0048] like Figure 6 Since the winding member 231 is located at the circumferential wire inlet 214, a third channel 2315 is provided on the winding member 231 corresponding to the first wire guide 221. The first channel 2311 and the third channel 2315 on the winding member 231 are arranged horizontally side by side and independently. The outlet of the first channel 2311 is connected to the inlet of the first wire guide 212. The outlet and inlet of the third channel 2315 are connected to the inlet of the second wire guide 213 and the outlet of the first wire guide 221, respectively. The setting of the third channel 2315 plays a guiding role, so that the metal wire can be accurately and correctly guided into the second wire guide 213 for the second winding.

[0049] The wire is routed as follows: the wire initially enters through the inlet of the first channel 2311 and is introduced into the first wire guide 212. It then begins to travel along the first wire guide 212. After one loop, it is introduced into the second wire guide 213 through the cooperation of the first guide 221 and the third channel 2315. It then begins to travel along the second wire guide 213. After another loop, the wire end is introduced from the outlet of the second guide 223 into the inlet of the second channel 2312 and is locked in the wire locking hole 2314. The tension of the wire itself is used to lock the wire end in the wire locking hole 2314 to prevent the wire end from springing back.

[0050] The length of the metal wire is controlled by a servo motor 12 with an encoder. After the second turn is completed, the wire end is locked in the wire-locking hole 2314. The servo motor 12 rotates and continues to feed the wire until the cumulative wire length reaches L1, at which point it stops immediately and then immediately begins to reverse and tighten. During the tightening process, the wire end is locked in the wire-locking hole 2314, so that the metal wire can only be tightened unidirectionally along the outer periphery of the bundled steel bars, and the wire end does not slip or loosen. When the servo motor 12 retracts to the retraction amount = L1 - L2, it stops again. At this time, the drive motor 232 is started to drive the winding member 231 to rotate. The tail end of the metal wire connected to the wire feeding mechanism 1 at the entrance of the first channel 2311 is first twisted into a spiral and then breaks under the combined stress of torsion and bending. The tail end is loose and the wire end is locked. When the winding member 231 rotates and the metal wire breaks, the spiral loop loosens and locks the head end, completing the twisting and cutting of the metal wire. After the tail end breaks off, the broken end inside the guide tube 13 becomes a new wire end, which is convenient for secondary winding.

[0051] To facilitate the smooth second turn of the wire and its final insertion into the wire-holding hole 2314, as follows: Figure 7 The structure and position of the second channel 2312 and the third channel 2315 are designed such that the second channel 2312 and the third channel 2315 are arranged radially staggered front and back. The second channel 2312 is located behind the third channel 2315. The upper half of the second channel 2312 and the third channel 2315 are interconnected to form an integral channel, while the lower half of the two channels are set separately. The lower half of the second channel 2312 is set as a wire hole 2314, while the lower half of the third channel 2315 is an open through-slot structure.

[0052] Furthermore, to ensure that the metal wire can accurately enter the third channel 2315 or the second channel 2312 during routing, a staggered guide structure 224 is set on the first wire guide assembly 22, such as... Figure 8 Specifically, the misaligned guide structure 224 is characterized in that the depth of the first guide wire channel 221 radially outward along the circular through hole 211 is less than the depth of the second guide wire channel 223, while the depth of the third channel 2315 radially outward along the circular through hole 211 is adapted to the depth of the first guide wire channel 221, and the depth of the second channel 2312 is adapted to the depth of the second guide wire channel 223. Furthermore, since the upper parts of the second channel 2312 and the third channel 2315 are interconnected to form an integrated channel, the first guide wire channel 221 and the second guide wire channel 223 share a common outlet in order for both guide wires to be guided into this integrated channel.

[0053] When the metal wire is introduced in a staggered manner from wire guide 212 to wire guide 213, the wire end is first introduced from the outlet of wire guide 212 into the first guide channel 221. Utilizing the tension of the metal wire itself and the depth of the first guide channel 221, the wire end is guided from the inclined surface of the first guide channel 221 to the outlet and then into the third channel 2315. When the metal wire is exited from the outlet of wire guide 213, the wire end enters the second guide channel 223. Utilizing the tension of the metal wire itself and the depth of the second guide channel 223, the wire end is guided from the second guide channel 223 to the second channel 2312, where it is then locked into the wire locking hole 2314.

[0054] To facilitate the introduction of the metal wire, a second wire guide assembly 24 is provided at the wire inlet end of the wire winding channel, such as... Figure 9 The second wire guide assembly 24 corresponds to two third wire guide channels 241 arranged side-by-side along the axial direction, corresponding to wire guide channel one 212 and wire guide channel two 213. Each third wire guide channel 241 is a V-shaped guide channel, gradually narrowing from its inlet to its outlet to form a trumpet-shaped guide surface, facilitating the smooth introduction of the metal wire into the inlet of the wire guide channel. The two third wire guide channels 241 are independent channels to prevent wire misalignment.

[0055] To facilitate the binding of metal wires onto bundled steel bars, wire guide 1 212, wire guide 213, first guide wire 221, second guide wire 223, third guide wire 241, and second channel 2312 are all formed in an open structure along the direction towards the center of the circular through hole 211, so that the metal wires can be easily detached from the bundled steel bars.

[0056] Since the winding member 231 is ultimately used for twisting the metal wire, in order to complete the twisting of the wire's beginning and end, the first channel 2311 on the winding member 231 is divided into an upper closed structure and a lower open structure along the direction towards the center of the circular through hole 211. When the winding member 231 rotates, the metal wire at the wire inlet 2313 is cut off and then trapped in the upper closed structure to prevent the section of wire from detaching before it is twisted. After the metal wire is twisted, it can be detached from the lower open structure and tied to the bundled reinforcing bars.

[0057] The above description is only a preferred embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model by those skilled in the art within the scope of the technology disclosed in the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A rebar binding device, characterized in that: The device includes a binding mechanism and a wire feeding mechanism. The binding mechanism is used to wrap metal wire around bundles of reinforcing bars, and the wire feeding mechanism is used to connect the metal wire rolls and continuously supply wire to the binding mechanism. The wire feeding mechanism includes a wire feeding assembly and a servo motor for driving the wire feeding assembly to rotate forward and backward. The servo motor is equipped with an encoder, which is used to automatically calculate the wire feeding length when the wire feeding assembly rotates forward and the wire retraction length when the wire feeding assembly rotates backward.

2. The rebar binding device according to claim 1, characterized in that: The wire feeding assembly includes a main transport wheel and two auxiliary transport wheels. The two auxiliary transport wheels are engaged with the main transport wheel at a certain angle. The two auxiliary transport wheels are divided into transport wheel one and transport wheel two, which are arranged sequentially along the transport direction of the metal wire.

3. The rebar binding device according to claim 2, characterized in that: With the radial perpendicular line of the main transport wheel as a reference, the line connecting the center of the first transport wheel and the center of the main transport wheel forms angles a and b respectively, wherein angle a ranges from 6° to 10° and angle b ranges from 10° to 14°.

4. A rebar binding device according to claim 2, characterized in that: The main transport wheel has a first annular groove centered on its meshing surface, and the auxiliary transport wheel has a second annular groove centered on its meshing surface. Both the first and second annular grooves are grooves with a semi-circular cross-section. When the main transport wheel and the auxiliary transport wheel mesh, the first and second annular grooves interlock to form a continuous circular groove structure with a diameter matching that of the metal wire.

5. A rebar binding device according to claim 2, characterized in that: The binding mechanism includes a wire inlet, and the wire feeding mechanism also includes a wire guide tube. The wire guide tube is located below the second transport wheel, and the wire guide tube forms a tangential fit with the main transport wheel and the second transport wheel. The wire guide tube is hollow to form a wire feeding channel, and the outlet of the wire guide tube is connected to the wire inlet.

6. A rebar binding device according to claim 5, characterized in that: The binding mechanism includes a winding assembly. The winding assembly has a circular through hole coaxially arranged at its center for the bundle of reinforcing bars to pass through, and a winding channel is arranged along the outer periphery of the through hole. The winding channel is coaxially arranged with two separate winding channels, namely, winding channel one and winding channel two. Winding channel one and winding channel two are two independent winding channels with a circular arc cross-section. The winding assembly is provided with a circumferential winding inlet notch, and the inlet and outlet of winding channel one and winding channel two converge at the same circumferential winding inlet notch.

7. A rebar binding device according to claim 6, characterized in that: The binding mechanism includes a binding assembly, which includes a rotatable knotting member disposed at the circumferential yarn inlet. The knotting member includes a first channel and a second channel that are independent of each other. The first channel is connected to the inlet of the first yarn feed path, and the second channel is connected to the outlet of the second yarn feed path. The first channel and the second channel are located at the center of the knotting member and are perpendicularly connected to the yarn feed direction to form a connected structure.

8. A rebar binding device according to claim 7, characterized in that: The wire exit end of the winding channel is provided with a first wire guide assembly, which includes a first wire guide channel and a second wire guide channel. The first wire guide channel is used to misalign the outlet of the first wire guide channel and the inlet of the second wire guide channel. The second wire guide channel is used to connect the second wire guide channel and the second channel.

9. A rebar binding device according to claim 8, characterized in that: The wire inlet is disposed on the winding member and is connected to the first channel; the second channel includes a wire-locking hole, which is located below the connecting structure.

10. A rebar binding device according to claim 9, characterized in that: The first wire guide, the second wire guide, the second channel, the first guide wire, and the second guide wire all form an open structure along the direction toward the center of the circular through hole; the first channel is divided into an upper closed structure and a lower open structure along the direction toward the center of the circular through hole.

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