Reinforcing steel bar unwinding device with self-braking function

Abstract

The utility model discloses a reinforcing steel bar unwinding device with a self-braking function, and belongs to the technical field of reinforcing steel bar machining. Comprising a rack, a reinforcing steel bar unwinding structure, a reinforcing steel bar traction structure, a swing arm structure and a straightening structure, the swing arm structure comprises a stand column, a swing arm shaft and an upper fixing arm, when the reinforcing steel bar traction structure is pulled by a reinforcing steel bar to move backwards, the swing arm structure pulls a brake band, and the brake band loosens a brake disc on the reinforcing steel bar unwinding structure; the steel bar traction structure comprises a fixing plate, a fixing part in the middle of the lower side of the fixing plate and a plurality of traction mechanisms on the upper side of the fixing plate, the fixing part is fixed to the upper fixing arm and can be adjusted in the direction where the upper fixing arm is located, and the included angle between the fixing plate and the left-right direction is 0-15 degrees; the traction mechanism comprises a vertically-arranged guide wheel and a C-shaped protection plate on the front side of the guide wheel, an opening of the C-shaped protection plate faces the guide wheel, two arms of the C-shaped protection plate are located on the upper side and the lower side of the guide wheel respectively, and the steel bar is wound between the C-shaped protection plate and the guide wheel.

Description

Technical Field

[0001] This utility model belongs to the field of steel bar processing technology, and specifically relates to a steel bar uncoiling device with a self-braking function. Background Technology

[0002] In the fabrication of steel components, some components, such as steel trusses, utilize reinforcing bars. These reinforcing bars are produced from coils, straightened, cut, and finally shaped.

[0003] For example, patent application number CN202121725793.5 discloses a steel bar feeding device for steel bar truss production, including a frame and five steel bar unwinding structures arranged side-by-side on the left side of the frame; it also includes five vertical guide rollers vertically mounted on the frame, five steel bar guiding structures arranged side-by-side on the right side of the frame, and a steel bar positioning structure on the frame. Each steel bar unwinding structure has a vertical guide roller located at its right front, and a corresponding steel bar guiding structure located to the right of each unwinding structure. The steel bar guiding structure is located to the right rear of the corresponding vertical guide roller, and the steel bar positioning structure is located directly behind the rearmost steel bar guiding structure. The steel bar guiding structure includes a rectangular four-hole traction plate arranged along the left-right direction on the frame, and five rectangular four-hole traction plates arranged side-by-side on the left side of the rectangular four-hole traction plate. The machine frame includes a roller guiding mechanism, a left and right roller straightening mechanism, and an upper and lower roller straightening mechanism. The rectangular four-hole traction plate has four first traction holes arranged in a rectangular pattern. The rebar positioning structure includes a row of four-hole traction plates arranged along the left and right direction on the machine frame and a guide wheel traction mechanism located on the machine frame and directly above the center of the row of four-hole traction plates. The row of four-hole traction plates has four second traction holes arranged side by side. The rebar is wound out by the rebar unwinding structure, passes around the front side of the corresponding vertical guide roller, and passes sequentially through the corresponding roller guiding mechanism, the left and right roller straightening mechanism, and the upper and lower roller straightening mechanism, then to the first traction hole of the rebar guiding structure or the rebar positioning structure at the rear, and finally output by the second traction hole of the rebar positioning structure or the guide wheel traction mechanism.

[0004] For example, patent application number CN202121725791.6 discloses a rebar unwinding device for building materials, including a frame, at least one rebar unwinding structure on the left side of the frame, and a movable guide roller on the right front of the rebar unwinding structure. Multiple rebar unwinding structures are arranged side by side. The rebar output by the rebar unwinding structure passes around the front side of the movable guide roller and is output diagonally to the right and rear. The bottom of the rebar unwinding structure is rotatably mounted on the frame via a vertically arranged rotating shaft. A brake disc is coaxially mounted on the rotating shaft, and a brake band is covered on the brake disc. The lower end of the movable guide roller is located at the front of a swing arm structure, which is hinged to the frame. One end of the brake band is fixed to the frame, and the other end is connected to the rear of the swing arm structure. When the movable guide roller is pulled backward by the rebar, the swing arm structure moves forward or backward and pulls the brake band, which releases the brake disc. The swing arm structure includes a swing arm shaft, a lower fixed arm, an upper fixed arm, a front connecting rod, a front swing arm, a middle swing arm, a rear swing arm, a rear connecting rod, and a tension spring. The swing arm shaft is vertically arranged and its lower end is rotatably mounted on the frame. The upper fixed arm is arranged diagonally forward from left to right, with its left end fixed to the upper part of the swing arm shaft. The lower fixed arm is arranged diagonally forward from left to right, with its left end fixed to the lower part of the swing arm shaft and its right end hinged to the front end of the front connecting rod. The front connecting rod is arranged longitudinally, with its rear end hinged to the middle of the front swing arm. The front swing arm is arranged diagonally forward from left to right, with its right end hinged to the front end of the front connecting rod. The rear end of the tension spring is connected, and its left end is hinged to the front end of the rear connecting rod; the tension spring is arranged in the front-rear direction, and its front end is connected to the frame; the rear connecting rod is arranged in the front-rear direction, and its rear end is hinged to the middle or right end of the rear swing arm; the middle swing arm is arranged diagonally forward from left to right, and its right end is hinged to the middle of the rear connecting rod, and its left end is hinged to the frame; the rear swing arm is arranged diagonally forward from left to right, and its left end is connected to the right end of the brake band; the brake band covers the front side of the brake disc, and its left end is fixed to the frame; the lower end of the moving guide roller is rotatably located on the upper right side of the upper fixed arm.

[0005] The existing rebar uncoiling device includes a frame, a rebar uncoiling structure, a rebar traction structure, a swing arm structure, and a straightening structure. The rebar uncoiling structure and the straightening structure are arranged side by side, with the straightening structure arranged in a front-to-back direction. The swing arm structure includes a column, a vertically arranged swing arm shaft on the column, and an upper fixed arm on the swing arm shaft. The upper fixed arm is arranged diagonally from back to front towards the direction of the straightening structure. The rebar traction structure is located on the upper fixed arm and is in front of the rebar uncoiling structure. The rebar traction structure includes a vertically arranged movable guide roller. When the rebar traction structure is pulled backward by the rebar, the swing arm structure pulls the brake band, which releases the brake disc on the rebar uncoiling structure.

[0006] The applicant discovered the following problems when using the aforementioned rebar unwinding device:

[0007] (1) The steel bar itself is flexible and requires a large bending during guidance. When the steel bar is loosened, it may slip off the driven guide roller.

[0008] (2) The steel bars themselves are flexible and require a large bend when guiding them. The moving guide roller is just at the end of the bend to ensure a good effect and to tension the steel bars. The degree of bending varies when steel bars of different thicknesses are led out. Utility Model Content

[0009] To address the aforementioned problems, this utility model provides a rebar unwinding device with a self-braking function. It improves upon existing structures by adjusting the rebar traction structure to accommodate large bends in the rebar during unwinding, while using a C-shaped guard plate to prevent rebar slippage. Multiple traction mechanisms are distributed along the rebar, and the entire device is adjustable to ensure the sensitivity of self-braking for various rebar specifications. The technical solution is as follows:

[0010] This utility model provides a rebar uncoiling device with a self-braking function. The device includes a frame 6, a rebar uncoiling structure 1, a rebar traction structure 2, a swing arm structure 3, and a straightening structure 4. The rebar uncoiling structure 1 and the straightening structure 4 are arranged side by side, with the straightening structure 4 arranged in a front-to-back direction. The swing arm structure 3 includes a column 31, a vertically arranged swing arm shaft 32 on the column 31, and an upper fixed arm 33 on the swing arm shaft 32. The upper fixed arm 33 is arranged diagonally from back to front towards the direction of the straightening structure 4. The rebar traction structure 2 is located on the upper fixed arm 33 and is in front of the rebar uncoiling structure 1. When the rebar traction structure 2 is pulled backward by the rebar 5, the swing arm structure 3 pulls and brakes. The brake band releases the brake disc on the rebar unwinding structure 1; the rebar traction structure 2 includes a fixing plate 21, a fixing member 22 in the middle of the lower side of the fixing plate 21, and multiple traction mechanisms 23 on the upper side of the fixing plate 21. The fixing member 22 is fixed on the upper fixing arm 33 and can be adjusted along the direction of the upper fixing arm 33. The angle between the fixing plate 21 and the left and right directions is 0-15°; the multiple traction mechanisms 23 are located at the bend of the rebar 5 and are distributed along the rebar 5. The traction mechanism 23 includes a vertically arranged guide wheel 7 and a C-shaped guard plate 8 on its front side. The opening of the C-shaped guard plate 8 faces the guide wheel 7 and its two arms are located on the upper and lower sides of the guide wheel 7, respectively. The rebar 5 passes between the C-shaped guard plate 8 and the guide wheel 7.

[0011] In this embodiment of the present invention, the upper fixed arm 33 is a rectangular arm, and its rear end is fixed to the upper end of the swing arm shaft 32. The fixing member 22 includes two clamping plates 9 arranged side by side and four locking bolts 10 between them. The clamping plates 9 are arranged along the direction of the upper fixed arm 33, and their left and right sides extend relative to the corresponding sides of the upper fixed arm 33 to form extensions. The upper clamping plate 9 is fixed to the lower side of the fixing plate 21 and clamps the upper side of the upper fixed arm 33, and the lower clamping plate 9 clamps the lower side of the upper fixed arm 33. The four locking bolts 10 are arranged in a rectangular shape and are all vertically arranged. Two locking bolts 10 are provided on each of the left and right sides of the upper fixed arm 33. The two locking bolts 10 on the same side are arranged side by side along the direction of the upper fixed arm 33, and they abut against the corresponding side of the upper fixed arm 33. Their upper and lower ends are respectively fixed to the extensions on the corresponding sides of the two clamping plates 9 by nuts.

[0012] Furthermore, in this embodiment of the present invention, the lower end of the column 31 is fixed on the frame 6 and a support plate 34 is provided on its front upper end along the front-rear direction; the swing arm shaft 32 is located directly in front of the column 31, its lower end is rotatably mounted on the frame 6, and its upper part is rotatably mounted on the support plate 34; the rear end of the upper fixed arm 33 is located adjacent to and above the support plate 34.

[0013] In this embodiment of the present invention, the straightening structure 4 includes a straightening bracket 41 arranged in the front-to-back direction, a C-shaped limiting plate 42 at the front end of the straightening bracket 41, and two rows of straightening wheels 43 arranged side by side on the straightening bracket 41. Each row of straightening wheels 43 includes multiple straightening wheels 43 arranged side by side in the front-to-back direction. The two rows of straightening wheels 43 are staggered and located on the left and right sides of the reinforcing bar 5, respectively. The straightening wheels 43 are arranged vertically and are located on the same horizontal plane as the guide wheel 7. The C-shaped limiting plate 42 is arranged in the left-to-right direction and its opening faces downward, forming a strip-shaped hole with the straightening bracket 41. The reinforcing bar 5 passes through the C-shaped limiting plate 42 and then passes between the two rows of straightening wheels 43.

[0014] Specifically, in this embodiment of the present invention, the lower arm of the C-shaped guard plate 8 is welded and fixed to the upper side of the fixing plate 21, and the upper and lower ends of the rotating shaft of the guide wheel 7 are respectively located on the two arms of the C-shaped guard plate 8.

[0015] In this embodiment of the present invention, the multiple traction mechanisms 23 are arranged at equal intervals, the distance between two adjacent traction mechanisms 23 is 15-35cm, and the distance between the bent part of the C-shaped guard plate 8 and the corresponding side of the guide wheel 7 is 3-5cm.

[0016] Specifically, in this embodiment of the present invention, there are three traction mechanisms 23. The three traction mechanisms 23 are arranged in an isosceles triangle and are located at the front and rear ends and the middle of the fixing plate 21, respectively. The traction mechanism 23 in the middle is located at the apex of the isosceles triangle and is set away from the rebar unwinding structure 1 relative to the other two traction mechanisms 23.

[0017] In this embodiment of the invention, the guide wheel 7 has a height of 3-5cm and a coaxial annular groove on its circumference; the cross-section of the annular groove is an isosceles trapezoid.

[0018] The beneficial effects of the technical solution provided by this utility model embodiment are as follows: This utility model embodiment provides a rebar unwinding device with self-braking function. It improves upon the existing structure by adjusting the rebar traction structure to adapt to the situation of large bending of the rebar. At the same time, it prevents the rebar from slipping through the C-shaped guard plate (while ensuring that the rebar can bend within a certain range) and allows the rebar to bend within a certain range (which can be coordinated with the overall adjustment of multiple traction mechanisms). Through the distribution of multiple traction mechanisms along the rebar, and the overall adjustability, it ensures the sensitivity of self-braking for various specifications of rebar (ensuring that the rebar traction structure is at the bending point of the rebar). Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of a rebar unwinding device with self-braking function in an embodiment of this utility model;

[0020] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0021] Figure 3 This is a structural diagram of the combination of the steel reinforcement traction structure and the upper fixed arm.

[0022] In the diagram: 1. Rebar unwinding structure, 2. Rebar traction structure, 3. Swing arm structure, 4. Straightening structure, 5. Rebar, 6. Frame, 7. Guide wheel, 8. C-shaped guard plate, 9. Clamping plate, 10. Locking bolt;

[0023] 21 Fixing plate, 22 Fixing component, 23 Upper fixing arm;

[0024] 31 Column, 32 Swing arm shaft, 33 Upper fixed arm, 34 Support plate;

[0025] 41 Straighter bracket, 42 C-shaped limit plate, 43 Straighter wheel. Detailed Implementation

[0026] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] See Figure 1-3 Example 1 provides a rebar unwinding device with self-braking function. The device includes a frame 6, a rebar unwinding structure 1, a rebar traction structure 2, a swing arm structure 3, and a straightening structure 4, etc. The rebar unwinding structure 1 and the straightening structure 4 are arranged side by side.

[0029] The straightening structure 4 is arranged in the front-to-back direction. The straightening structure 4 includes a straightening bracket 41 arranged in the front-to-back direction, a C-shaped limiting plate 42 at the front end of the straightening bracket 41, and two rows of straightening wheels 43 arranged side by side on the straightening bracket 41. Each row of straightening wheels 43 includes multiple (at least three) straightening wheels 43 arranged side by side. The two rows of straightening wheels 43 are staggered and located on the left and right sides of the reinforcing bar 5, respectively. The straightening wheels 43 are vertically arranged and are on the same horizontal plane as the guide wheel 7. The C-shaped limiting plate 42 is arranged in the left-to-right direction and its opening faces downward, forming a strip-shaped hole with the straightening bracket 41 (arranged in the left-to-right direction, with a height approximately the same as the height of the straightening wheels 43). The reinforcing bar 5 passes through the C-shaped limiting plate 42 (specifically the strip-shaped hole) and then passes between the two rows of straightening wheels 43.

[0030] The swing arm structure 3 includes a column 31, a swing arm shaft 32, a lower fixed arm, an upper fixed arm 33, a front connecting rod, a front swing arm, a middle swing arm, a rear swing arm, a rear connecting rod, and a tension spring. The column 31 is vertically positioned, its lower end fixed to the frame 6, and its upper front end is provided with a support plate 34 along the front-rear direction. The swing arm shaft 32 is located directly in front of the column 31, vertically positioned, its lower end rotatably mounted on the frame 6, and its upper part rotatably mounted on the support plate 34. The upper fixed arm 33 is angled from back to front towards the direction of the relatively straight structure 4, its rear end fixed to the top of the swing arm shaft 32 and located adjacent to and above the support plate 34. When the rebar traction structure 2 is pulled backward by the rebar 5, the swing arm structure 3 pulls the brake band, which releases the brake disc on the rebar unwinding structure 1. The structure of the swing arm structure 3 can be found in the description of application number CN202121725791.6.

[0031] The rebar traction structure 2 is mounted on the upper fixed arm 33 and is located in front of the rebar unwinding structure 1. Specifically, the rebar traction structure 2 includes a fixed plate 21, a fixing element 22, and multiple traction mechanisms 23. The fixed plate 21 is located on the upper side of the upper fixed arm 33, with an angle of 0-15° between it and the left and right directions. The fixing element 22 is located in the lower middle part of the fixed plate 21, fixed to the upper fixed arm 33, and can be adjusted along the direction of the upper fixed arm 33. Multiple traction mechanisms 23 are arranged side by side on the upper side of the fixed plate 21, located at the bend of the rebar 5 (specifically, the bend at the front end), and distributed along the rebar 5. Specifically, the multiple traction mechanisms 23 are arranged at equal intervals, with a distance of 15-35cm between two adjacent traction mechanisms 23.

[0032] The traction mechanism 23 includes a vertically arranged guide wheel 7 and a C-shaped guard plate 8 on its front side. The opening of the C-shaped guard plate 8 faces the guide wheel 7, and its two arms are located on the upper and lower sides of the guide wheel 7, respectively. The reinforcing bar 5 passes around the C-shaped guard plate 8 between the guide wheel 7 and the guide wheel 7. The distance between the bent part of the C-shaped guard plate 8 and the corresponding side of the guide wheel 7 is 3-5 cm. The guide wheel 7 has a height of 3-5 cm, and a ring groove is coaxially provided on its circumference. The cross-section of the ring groove is an isosceles trapezoid.

[0033] Among them, see Figure 1-3 In this embodiment of the invention, the upper fixing arm 33 is a rectangular arm. The fixing component 22 includes two clamping plates 9 arranged side by side and four locking bolts 10 between them. The clamping plates 9 are arranged along the direction of the upper fixing arm 33, and their left and right sides extend relative to the corresponding sides of the upper fixing arm 33 to form extensions, which are specifically rectangular plates. The upper clamping plate 9 is fixed to the lower side of the fixing plate 21 and clamps the upper side of the upper fixing arm 33, while the lower clamping plate 9 clamps the lower side of the upper fixing arm 33. The four locking bolts 10 are arranged in a rectangular shape and are all vertically arranged, with two locking bolts 10 on each of the left and right sides of the upper fixing arm 33. The two locking bolts 10 on the same side are arranged side by side along the direction of the upper fixing arm 33, and their tops rest against the corresponding sides of the upper fixing arm 33. Their upper and lower ends are respectively fixed to the extensions on the corresponding sides of the two clamping plates 9 by nuts. Loosening the nuts allows adjustment of the position of the rebar traction structure 2.

[0034] Example 2

[0035] See Figure 1-3 Example 2 provides a rebar unwinding device with self-braking function. Its structure is basically the same as that of Example 1. The difference is that the number of traction mechanisms 23 in this example is three. The three traction mechanisms 23 are arranged in an isosceles triangle and are located at the front and rear ends and the middle of the fixed plate 21, respectively. The traction mechanism 23 in the middle is located at the apex of the isosceles triangle and is set away from the rebar unwinding structure 1 relative to the other two traction mechanisms 23.

[0036] Example 3

[0037] Example 3 provides a rebar unwinding device with self-braking function. Its structure is basically the same as that of Example 2. The difference is that the lower arm of the C-shaped guard plate 8 in this example is welded and fixed to the upper side of the fixed plate 21, and the upper and lower ends of the rotating shaft of the guide wheel 7 are respectively located on the two arms of the C-shaped guard plate 8.

[0038] Example 4

[0039] See Figure 2Example 4 provides a rebar unwinding device with self-braking function. Its structure is basically the same as that of Example 2, except that: in this example, the rebar unwinding structure 1 is located on the right side and the straightening structure 4 is located on the left side; the upper fixed arm 33 is set diagonally forward from right to left; the rebar 5 is output from the rebar unwinding structure 1, passes around the three traction mechanisms 23 in sequence to the left front, and then goes to the straightening structure 4 to the rear.

[0040] Example 5

[0041] Example 5 provides a rebar unwinding device with self-braking function. Its structure is basically the same as that of Example 1, except that: the diameter of the rebar 5 in this example is 6mm; the diameter of the guide wheel 7 is 4cm and its height is 4cm; the distance between the bent part of the C-shaped guard plate 8 and the corresponding side of the guide wheel 7 is 3.5cm.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rebar unwinding device with self-braking function, comprising a frame (6), a rebar unwinding structure (1), a rebar traction structure (2), a swing arm structure (3), and a straightening structure (4), wherein the rebar unwinding structure (1) and the straightening structure (4) are arranged side by side, the straightening structure (4) is arranged in a front-rear direction, the swing arm structure (3) comprises a column (31), a swing arm shaft (32) arranged vertically on the column (31), and an upper fixed arm (33) on the swing arm shaft (32), the upper fixed arm (33) is arranged obliquely from back to front towards the direction of the straightening structure (4), the rebar traction structure (2) is arranged on the upper fixed arm (33) and is located in front of the rebar unwinding structure (1); when the rebar traction structure (2) is pulled backward by the rebar (5), the swing arm structure (3) pulls the brake band, and the brake band releases the brake disc on the rebar unwinding structure (1); characterized in that, The rebar traction structure (2) includes a fixed plate (21), a fixing member (22) in the middle of the lower side of the fixed plate (21), and multiple traction mechanisms (23) on the upper side of the fixed plate (21). The fixing member (22) is fixed on the upper fixed arm (33) and can be adjusted along the direction of the upper fixed arm (33). The angle between the fixed plate (21) and the left and right directions is 0-15°. The multiple traction mechanisms (23) are located at the bend of the rebar (5) and are distributed along the rebar (5). The traction mechanism (23) includes a vertically arranged guide wheel (7) and a C-shaped guard plate (8) on its front side. The opening of the C-shaped guard plate (8) faces the guide wheel (7) and its two arms are located on the upper and lower sides of the guide wheel (7) respectively. The rebar (5) passes between the C-shaped guard plate (8) and the guide wheel (7).

2. The rebar unwinding device with self-braking function according to claim 1, characterized in that, The upper fixed arm (33) is a rectangular arm, and its rear end is fixed to the upper end of the swing arm shaft (32); the fixing member (22) includes two clamping plates (9) arranged side by side and four locking bolts (10) between them; the clamping plates (9) are arranged along the direction of the upper fixed arm (33), and their left and right sides extend relative to the corresponding sides of the upper fixed arm (33) to form extensions; the upper clamping plate (9) is fixed to the lower side of the fixing plate (21) and clamps the upper fixed arm (33). The upper side of the upper fixed arm (33) is clamped by the lower clamping plate (9) on the lower side of the upper fixed arm (33); the four locking bolts (10) are arranged in a rectangular shape and are all vertically set. There are two locking bolts (10) on each side of the upper fixed arm (33); the two locking bolts (10) on the same side are arranged side by side along the direction of the upper fixed arm (33), and they abut against the corresponding side of the upper fixed arm (33). Their upper and lower ends are respectively fixed to the extensions of the corresponding sides of the two clamping plates (9) by nuts.

3. The rebar unwinding device with self-braking function according to claim 1, characterized in that, The lower end of the column (31) is fixed on the frame (6) and a support plate (34) is provided on its front upper end along the front-rear direction; the swing arm shaft (32) is located directly in front of the column (31), its lower end is rotatably mounted on the frame (6), and its upper part is rotatably mounted on the support plate (34); the rear end of the upper fixed arm (33) is located adjacent to the support plate (34).

4. The rebar unwinding device with self-braking function according to claim 1, characterized in that, The straightening structure (4) includes a straightening bracket (41) arranged in the front-back direction, a C-shaped limiting plate (42) at the front end of the straightening bracket (41), and two rows of straightening wheels (43) arranged side by side on the straightening bracket (41). Each row of straightening wheels (43) includes multiple straightening wheels (43) arranged side by side in the front-back direction. The two rows of straightening wheels (43) are staggered and located on the left and right sides of the reinforcing bar (5). The straightening wheels (43) are arranged vertically and are located on the same horizontal plane as the guide wheel (7). The C-shaped limiting plate (42) is arranged in the left-right direction and its opening faces downward, forming a strip hole with the straightening bracket (41). The reinforcing bar (5) passes through the C-shaped limiting plate (42) and then passes between the two rows of straightening wheels (43).

5. The rebar unwinding device with self-braking function according to claim 1, characterized in that, The lower arm of the C-shaped guard plate (8) is welded and fixed to the upper side of the fixing plate (21), and the upper and lower ends of the rotating shaft of the guide wheel (7) are respectively located on the two arms of the C-shaped guard plate (8).

6. The rebar unwinding device with self-braking function according to claim 1, characterized in that, Multiple traction mechanisms (23) are arranged at equal intervals, with a distance of 15-35cm between two adjacent traction mechanisms (23), and a distance of 3-5cm between the bent part of the C-shaped guard plate (8) and the corresponding side of the guide wheel (7).

7. The rebar unwinding device with self-braking function according to claim 6, characterized in that, The number of the traction mechanism (23) is three. The three traction mechanisms (23) are arranged in an isosceles triangle and are located at the front and rear ends and the middle of the fixed plate (21), respectively. The traction mechanism (23) in the middle is located at the apex of the isosceles triangle and is set away from the steel bar unwinding structure (1) relative to the other two traction mechanisms (23).

8. The rebar unwinding device with self-braking function according to claim 1, characterized in that, The guide wheel (7) has a height of 3-5cm and a ring groove is provided coaxially on its circumference; the cross section of the ring groove is an isosceles trapezoid.

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