Automatic bending device for metal wire

Abstract

The application belongs to the technical field of metal wire bending, and particularly relates to an automatic metal wire bending device, which comprises a fixing base, a straightening mechanism arranged on the fixing base and used for straightening the wire, a driving roller mechanism arranged in front of the straightening mechanism and used for driving the wire, an eye-shaped die base arranged in front of the driving roller mechanism, a bending mechanism arranged in front of the eye-shaped die base, a first air cylinder, an upper die plate fixedly installed on the output end of the first air cylinder, a cutting knife installed on one side of the upper die plate, a lower die base movably inserted into the fixing base, a second air cylinder fixedly installed on the fixing base and used for driving the lower die base, two groups of sliding blocks symmetrically arranged on the back side of the upper die plate, and sliding rails slidably connected with the sliding blocks and fixedly installed on the fixing base. The upper die plate and the lower die base are matched and set to realize one-time bending of the metal wire and improve the bending efficiency of the metal wire.

Description

Technical Field

[0001] This invention belongs to the field of metal wire bending technology, specifically an automated metal wire bending device. Background Technology

[0002] Bending is used to transform straight metal into three-dimensional functional components such as springs, frames, and hooks. One-piece molding saves materials and labor; bending forms closed loops or reinforcing ribs to improve rigidity; the ends form hooks for tool-free and quick assembly; spiral and arc structures provide elasticity and cushioning, and adapt to space and human body curves, balancing strength, cost, and appearance. Currently, bending machines are used to bend metal wires.

[0003] Existing bending machines mainly consist of a straightening mechanism, a driving mechanism, a cutting mechanism, and a bending mechanism. When bending metal wire, the driving mechanism moves the metal wire, causing it to be straightened by the straightening mechanism. After straightening, the metal wire is bent multiple times by the bending mechanism to bend it into a finished product. Finally, the cutting mechanism cuts the finished product, completing the bending process of the metal wire.

[0004] As attached Figure 1 As shown, the finished wire has multiple bends, but the bending mechanism on the existing bending machine can only perform one bend at a time. Therefore, a single wire needs to be bent multiple times to be processed into a finished product. This processing method results in a lower yield of the finished wire. To address this, the present invention provides an automated bending device for metal wire. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides an automated bending device for metal wire, including a fixed base, a straightening mechanism for straightening wire is provided on the fixed base, a drive roller mechanism for driving wire is provided in front of the straightening mechanism, a die holder is provided in front of the drive roller mechanism, a bending mechanism is provided in front of the die holder, the bending mechanism includes a first cylinder, the first cylinder is fixedly installed on the fixed base, an upper template is fixedly installed on the output end of the first cylinder, a cutting knife is installed on one side of the upper template, a lower die holder is movably inserted into the fixed base, a second cylinder is fixedly installed on the fixed base for driving the lower die holder, and two sets of sliders are symmetrically arranged on the back side of the upper template, the sliders are slidably connected to a slide rail, and the slide rail is fixedly installed on the fixed base;

[0007] By coordinating the upper template and the lower mold base, the metal wire can be bent in one go, thus improving the bending efficiency of the metal wire.

[0008] Preferably, the lower mold base includes a lower template, which is movably inserted into a fixed base. Two sets of L-shaped plates are symmetrically movably installed on the lower template. A receiving block is fixedly connected to the lower end of the L-shaped plate. Guide pillars are symmetrically fixedly installed inside the lower template. A spring is sleeved on the guide pillar. A sliding sleeve is slidably connected to the guide pillar. A sliding plate is fixedly connected to the upper end of the sliding sleeve. One end of the sliding plate is fixedly connected to the output end of the second cylinder. Two sets of limiting blocks are symmetrically arranged on both sides of the lower template. A sliding groove is provided on the fixed base. The lower template is slidably connected to the sliding groove. Two sets of oblique grooves are symmetrically provided on the sliding plate. A pin is provided at the lower end of the receiving block. The lower end of the pin is located in the oblique groove. Two sets of movable grooves are symmetrically provided on the lower template. The L-shaped plate is slidably connected to the movable groove. Two sets of countersunk holes are provided on one side of the movable groove. Two sets of guide shafts are provided on one side of the L-shaped plate. The guide shafts are slidably connected to the countersunk holes. An avoidance groove is provided at the bottom of the movable groove. The receiving block is slidably connected to the avoidance groove.

[0009] Guided by the inclined groove, the two sets of receiving blocks move the two sets of L-shaped plates in opposite directions. The L-shaped plates drive the guide shaft to slide along the countersunk hole, releasing the finished product from between the two sets of L-shaped plates. Then, the slide plate drives the guide post and the lower template to move through the sliding sleeve. The lower template slides along the slide groove, causing the outer wall of the fixed seat to push the finished product away from the lower template, thus realizing the automatic unloading of the finished product. Because the finished product is released from the mold groove in advance, deformation is avoided when the finished product is released from the lower template, ensuring the quality of the finished product.

[0010] Preferably, a limiting mechanism is provided between the upper template and the lower mold base. The limiting mechanism includes two sets of limiting shafts, one end of which is rotatably connected to a movable plate and a third cylinder. The third cylinder is fixedly installed on the back side of the fixed base, and the output end of the third cylinder is fixedly connected to the movable plate. Two sets of guide grooves are symmetrically arranged on one side of the movable plate. The guide grooves are slidably connected to guide rails, and the guide rails are fixedly installed on the fixed base. The fixed base also has two sets of rectangular through holes, through which the two sets of limiting shafts pass respectively. A baffle for limiting the wire is also provided on the fixed base.

[0011] When the metal wire is conveyed to the lower die base, the end of the metal wire abuts against the baffle, pausing the conveying of the metal wire. Then, the third cylinder pushes the movable plate and the two sets of limit shafts to move downwards. At the same time, the guide groove on the movable plate slides along the guide rail, guiding the movement of the movable plate and the limit shafts until the limit shafts press against the metal wire. Because the end of the metal wire is blocked by the baffle and the metal wire is also pressed by the two sets of limit shafts, the metal wire is prevented from shifting laterally and axially during cutting.

[0012] The beneficial effects of this invention are as follows:

[0013] 1. By coordinating the upper template and the lower mold base, the metal wire can be bent in one go, thus improving the bending efficiency of the metal wire.

[0014] 2. When bending metal wire, the upper and lower templates engage. After the upper template disengages from the lower template, the finished product is stuck between the two sets of L-shaped plates. At this time, the limiting block is blocked, preventing the entire lower template from moving. Simultaneously, the two sets of springs are compressed. When the second cylinder pulls the lower mold base, it first pulls the sliding plate. Under the spring's rebound force, the sliding plate drives the sliding sleeve to slide along the guide post. During this process, the lower template will not slide along the groove. At the same time, the two sets of pins slide along the two sets of inclined grooves. Guided by the inclined grooves, the two sets of receiving blocks drive the two sets of L-shaped plates to move in opposite directions. The L-shaped plates drive the guide shaft to slide along the countersunk hole, releasing the finished product from between the two sets of L-shaped plates. Then, the sliding plate drives the guide post and the lower template to move through the sliding sleeve. The lower template slides along the groove, causing the outer wall of the fixed seat to push the finished product out of the lower template, thus achieving the automatic unloading of the finished product. By releasing the finished product from the mold groove in advance, deformation is avoided when the finished product disengages from the lower template, ensuring the quality of the finished product.

[0015] 3. When cutting metal wire, the metal wire is prone to shifting because it is not fixed. When the metal wire is conveyed to the lower die, the end of the metal wire abuts against the baffle, pausing the conveying of the metal wire. Then, the third cylinder pushes the movable plate and the two sets of limit shafts to move downward. At the same time, the guide groove on the movable plate slides along the guide rail, guiding the movement of the movable plate and the limit shafts until the limit shafts press against the metal wire. Because the end of the metal wire is blocked by the baffle and the metal wire is also pressed by the two sets of limit shafts, the lateral and axial shift of the metal wire is prevented during cutting. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the finished product of the present invention.

[0018] Figure 2 This is a partial structural diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of the combination of the fixing base and the bending mechanism of the present invention.

[0020] Figure 4 This is a cross-sectional view of the assembly of the fixed base, lower mold base, and second cylinder of the present invention.

[0021] Figure 5 This is a cross-sectional view of the lower mold base and the second cylinder assembly of the present invention.

[0022] Figure 6 This is a cross-sectional schematic diagram of the lower mold base of the present invention.

[0023] Figure 7 This is a schematic diagram of the combination of the template, L-shaped plate, and receiving block of the present invention.

[0024] Figure 8 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 9 This is a schematic diagram of the overall structure of the present invention from another perspective.

[0026] In the diagram: 1. Fixed base; 101. Slide groove; 102. Baffle; 103. Rectangular through hole;

[0027] 2. Straightening mechanism; 3. Drive roller mechanism; 4. Eyed mold base;

[0028] 5. Bending mechanism; 501. Upper template; 5011. Slider; 5012. Slide rail; 502. Cutting blade; 503. First cylinder;

[0029] 504. Lower mold base; 5041. Lower template; 411. Movable groove; 412. Countersunk hole; 413. Clearance groove; 5042. Limiting block; 5043. L-shaped plate; 431. Guide shaft; 5044. Guide post; 5045. Spring; 5046. Sliding sleeve; 5047. Receiving block; 471. Pin; 5048. Mold groove; 5049. Slide plate; 491. Angled groove;

[0030] 505, Second Cylinder;

[0031] 6. Finished product;

[0032] 7. Limiting mechanism; 701. Limiting shaft; 702. Movable plate; 7021. Guide groove; 703. Third cylinder; 704. Guide rail. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0034] Example 1: As Figure 1 and Figure 2As shown in the embodiment of the present invention, an automated metal wire bending device includes a fixed base 1, a straightening mechanism 2 for straightening wires is provided on the fixed base 1, a drive roller mechanism 3 for driving wires is provided in front of the straightening mechanism 2, a die holder 4 is provided in front of the drive roller mechanism 3, and a bending mechanism 5 is provided in front of the die holder 4. The bending mechanism 5 includes a first cylinder 503, which is fixedly installed on the fixed base 1, an upper template 501 fixedly installed on the output end of the first cylinder 503, a cutting blade 502 installed on one side of the upper template 501, a lower die holder 504 movably inserted into the fixed base 1, a second cylinder 505 fixedly installed on the fixed base 1 for driving the lower die holder 504, and two sets of sliders 5011 symmetrically arranged on the back side of the upper template 501. The sliders 5011 are slidably connected to a slide rail 5012, and the slide rail 5012 is fixedly installed on the fixed base 1.

[0035] Specifically, the lower die holder 504 can engage with the upper die holder 501. When bending the metal wire is required, the metal wire is passed sequentially through the straightening mechanism 2, the drive roller mechanism 3, and the right eye die holder 4. Then, the drive roller mechanism 3 is driven by a motor, which moves the metal wire. During the movement of the metal wire, it is straightened by the straightening mechanism 2, and the straightened metal wire moves onto the lower die holder 504. Then, the first cylinder 503 is activated, pushing the upper die holder 501 and the cutting blade 502 downwards. At the same time, the upper die holder 501 drives the slider 5011 to slide along the slide rail 5012, which guides the movement of the upper die holder 501 and the cutting blade 502. As the cutting blade 502 moves downwards, it will move along the end of the right eye die holder 4, cutting the metal wire. The upper die holder 501 then presses down on the lower die holder 504. A section of metal wire is bent until the upper template 501 engages with the lower mold base 504, simultaneously pressing the metal wire into a finished product 6, thus achieving automatic bending of the metal wire. Then, the upper template 501 is retracted, and the second cylinder 505 is activated. The second cylinder 505 pulls the lower mold base 504 to move, and the finished product 6 will move towards the fixed base 1 along with the lower mold base 504. The finished product 6 will be blocked by the outer wall of the fixed base 1 and cannot move further. As the lower mold base 504 continues to move, the finished product 6 will detach from the lower mold base 504, thus achieving unloading of the finished product 6. After the finished product 6 detaches from the lower mold base 504, the second cylinder 505 pushes the lower mold base 504 to move, so that the lower mold base 504 returns to its original position. Then, the above operation is repeated. Compared with the existing technology, by setting the upper template 501 and the lower mold base 504 in coordination, the metal wire can be bent in one go, improving the bending efficiency of the metal wire.

[0036] like Figures 3 to 7As shown, the lower mold base 504 includes a lower mold plate 5041, which is movably inserted into the fixed base 1. Two sets of L-shaped plates 5043 are symmetrically and movably installed on the lower mold plate 5041. A receiving block 5047 is fixedly connected to the lower end of the L-shaped plate 5043. Guide posts 5044 are symmetrically and fixedly installed inside the lower mold plate 5041. A spring 5045 is sleeved on the guide post 5044. A sliding sleeve 5046 is slidably connected to the guide post 5044. A sliding plate 5049 is fixedly connected to the upper end of the sliding sleeve 5046. One end of the sliding plate 5049 is fixedly connected to the output end of the second cylinder 505. Two sets of limiting blocks 5042 are symmetrically arranged on both sides of the lower mold plate 5041. The fixed base 1... The upper part has a sliding groove 101, and the lower template 5041 is slidably connected to the sliding groove 101. The sliding plate 5049 has two sets of inclined grooves 491 symmetrically opened. The lower end of the receiving block 5047 is provided with a pin 471, and the lower end of the pin 471 is located in the inclined groove 491. The lower template 5041 has two sets of movable grooves 411 symmetrically opened. The L-shaped plate 5043 is slidably connected to the movable groove 411. Two sets of countersunk holes 412 are opened on one side of the movable groove 411. Two sets of guide shafts 431 are provided on one side of the L-shaped plate 5043. The guide shafts 431 are slidably connected to the countersunk holes 412. The bottom of the movable groove 411 is provided with an avoidance groove 413, and the receiving block 5047 is slidably connected to the avoidance groove 413.

[0037] Specifically, after the metal wire is pressed between the upper template 501 and the lower mold base 504, the metal wire has a certain rebound force, causing the finished product 6 to be stuck in the mold groove 5048. When the outer wall of the fixing seat 1 forcibly pushes the finished product 6 away from the lower mold base 504, it is easy to cause the finished product 6 to deform and reduce the product quality. Therefore, when bending the metal wire, the upper template 501 and the lower template 5041 are engaged. When the upper template 501 is disengaged from the lower template 5041, the finished product 6 is stuck between the two sets of L-shaped plates 5043. At this time, the limiting block 5042 is blocked, making the entire lower template 5041 unable to move. At the same time, the two sets of springs 5045 are in a compressed state. When the second cylinder 505 pulls the lower mold base 504 to move, the second cylinder 505 will first pull the sliding plate 5049. Under the rebound force of the spring 5045, the sliding plate 5049 drives the sliding sleeve 5046 along the... During the sliding of the guide post 5044, the lower template 5041 will not slide along the slide groove 101. At the same time, the two sets of pins 471 slide along the two sets of inclined grooves 491 respectively. Under the guidance of the inclined grooves 491, the two sets of receiving blocks 5047 drive the two sets of L-shaped plates 5043 to move in opposite directions. The L-shaped plates 5043 drive the guide shaft 431 to slide along the countersunk hole 412, and the finished product 6 is stuck between the two sets of L-shaped plates 5043. Then, the slide plate 5049 drives the guide post 5044 and the lower template 5041 to move through the sliding sleeve 5046. The lower template 5041 slides along the slide groove 101, so that the outer wall of the fixed seat 1 pushes the finished product 6 to get off the lower template 5041, realizing the above-mentioned automatic unloading of the finished product 6. Since the finished product 6 is released from the mold groove 5048 in advance, deformation is avoided when the finished product 6 gets off the lower template 5041, ensuring the quality of the finished product 6.

[0038] Example 2: Figure 8 Figures and Figure 9 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a limiting mechanism 7 is provided between the upper template 501 and the lower mold base 504. The limiting mechanism 7 includes two sets of limiting shafts 701. One end of the limiting shaft 701 is rotatably connected to a movable plate 702 and a third cylinder 703. The third cylinder 703 is fixedly installed on the back side of the fixed base 1. The output end of the third cylinder 703 is fixedly connected to the movable plate 702. Two sets of guide grooves 7021 are symmetrically arranged on one side of the movable plate 702. The guide grooves 7021 are slidably connected to a guide rail 704. The guide rail 704 is fixedly installed on the fixed base 1. The fixed base 1 also has two sets of rectangular through holes 103. The two sets of limiting shafts 701 pass through the two sets of rectangular through holes 103 respectively. The fixed base 1 is also provided with a baffle 102 for limiting the wire.

[0039] Specifically, during the cutting of the metal wire, since the metal wire is not fixed, it is prone to deviation. When the metal wire is conveyed to the lower die base 504, the end of the metal wire abuts against the baffle 102, pausing the conveying of the metal wire. Then, the third cylinder 703 pushes the movable plate 702 and the two sets of limiting shafts 701 to move downward. At the same time, the guide groove 7021 on the movable plate 702 slides along the guide rail 704, guiding the movement of the movable plate 702 and the limiting shafts 701 until the limiting shafts 701 press against the metal wire. Since the end of the metal wire is blocked by the baffle 102 and the metal wire is also pressed by the two sets of limiting shafts 701, the lateral and axial deviation of the metal wire is avoided during cutting.

[0040] Working principle: The metal wire is passed sequentially through the straightening mechanism 2, the drive roller mechanism 3, and the right eye mold base 4. Then, the drive roller mechanism 3 is driven by a motor, which moves the metal wire. During this movement, the metal wire is straightened by the straightening mechanism 2 and then moves onto the lower mold base 504. Next, the first cylinder 503 is activated, pushing the upper template 501 and the cutting blade 502 downwards. Simultaneously, the upper template 501 drives the slider 5011 to slide along the slide rail 5012, guiding the movement of the upper template 501 and the cutting blade 502. As the cutting blade 502 moves downwards, it will move along the end of the right eye mold base 4, cutting the metal wire. The upper template 501... A section of metal wire located on the lower mold base 504 is pressed down until the upper mold plate 501 engages with the lower mold base 504, simultaneously pressing the section of metal wire into finished product 6, thus achieving automatic bending of the metal wire. Then, the upper mold plate 501 is retracted, and the second cylinder 505 is activated. The second cylinder 505 pulls the lower mold base 504 to move, and the finished product 6 will move towards the fixed base 1 along with the lower mold base 504. The finished product 6 will be blocked by the outer wall of the fixed base 1 and cannot move. As the lower mold base 504 continues to move, the finished product 6 will detach from the lower mold base 504, thus achieving unloading of the finished product 6. After the finished product 6 detaches from the lower mold base 504, the second cylinder 505 pushes the lower mold base 504 to move, so that the lower mold base 504 returns to its original position. Then, the above operation is repeated.

[0041] When bending the metal wire, the upper template 501 engages with the lower template 5041. When the upper template 501 disengages from the lower template 5041, the finished product 6 is stuck between the two sets of L-shaped plates 5043. At this time, the limiting block 5042 is blocked, preventing the entire lower template 5041 from moving. Simultaneously, the two sets of springs 5045 are compressed. When the second cylinder 505 pulls the lower mold base 504 to move, the second cylinder 505 will first pull the sliding plate 5049. Under the rebound force of the spring 5045, the sliding plate 5049 drives the sliding sleeve 5046 to slide along the guide post 5044. During this process, the lower template 5041... 041 will not slide along the slide groove 101. At the same time, the two sets of pins 471 slide along the two sets of inclined grooves 491 respectively. Under the guidance of the inclined grooves 491, the two sets of receiving blocks 5047 drive the two sets of L-shaped plates 5043 to move in opposite directions. The L-shaped plates 5043 drive the guide shaft 431 to slide along the countersunk hole 412. The finished product 6 is stuck between the two sets of L-shaped plates 5043. Then, the slide plate 5049 drives the guide post 5044 to move together with the lower template 5041 through the sliding sleeve 5046. The lower template 5041 slides along the slide groove 101, so that the outer wall of the fixed seat 1 pushes the finished product 6 to get off the lower template 5041.

[0042] When cutting the metal wire, the metal wire is prone to shifting because it is not fixed. When the metal wire is conveyed to the lower die base 504, the end of the metal wire abuts against the baffle 102, pausing the conveying of the metal wire. Then, the third cylinder 703 pushes the movable plate 702 and the two sets of limiting shafts 701 to move downward. At the same time, the guide groove 7021 on the movable plate 702 slides along the guide rail 704, which guides the movement of the movable plate 702 and the limiting shafts 701 until the limiting shafts 701 press against the metal wire.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automated bending device for metal wire, comprising a fixed base (1), characterized in that: The fixed base (1) is provided with a straightening mechanism (2) for straightening the straight wire, and a driving roller mechanism (3) for driving the wire is provided in front of the straightening mechanism (2). A mold seat (4) with eyelets is provided in front of the driving roller mechanism (3), and a bending mechanism (5) is provided in front of the mold seat (4). The bending mechanism (5) includes a first cylinder (503), which is fixedly mounted on the fixed base (1); The upper template (501) is fixedly installed on the output end of the first cylinder (503); A cutting blade (502) is installed on one side of the upper template (501); The lower mold base (504) is movably inserted into the fixed base (1); A second cylinder (505) is fixedly installed on the fixed base (1) for driving the lower mold base (504); The lower mold base (504) includes a lower template (5041), which is movably inserted into the fixed base (1); Two sets of L-shaped plates (5043) are symmetrically and movablely installed on the lower template (5041); The receiving block (5047) is fixedly connected to the lower end of the L-shaped plate (5043). Guide pillars (5044) are symmetrically fixedly installed inside the lower template (5041). A spring (5045) sleeved on the guide post (5044); The sliding sleeve (5046) is slidably connected to the guide post (5044). The upper end of the sliding sleeve (5046) is fixedly connected to the sliding plate (5049), and one end of the sliding plate (5049) is fixedly connected to the output end of the second cylinder (505); Two sets of limiting blocks (5042) are symmetrically arranged on both sides of the lower template (5041); The sliding plate (5049) is symmetrically provided with two sets of inclined grooves (491), and the lower end of the receiving block (5047) is provided with a pin (471), the lower end of the pin (471) is located in the inclined groove (491); The fixed base (1) is provided with a sliding groove (101), the lower template (5041) is slidably connected to the sliding groove (101), the lower template (5041) is symmetrically provided with two sets of movable grooves (411), the L-shaped plate (5043) is slidably connected to the movable groove (411), two sets of countersunk holes (412) are provided on one side of the movable groove (411), two sets of guide shafts (431) are provided on one side of the L-shaped plate (5043), the guide shafts (431) are slidably connected to the countersunk holes (412), the bottom of the movable groove (411) is provided with a relief groove (413), and the receiving block (5047) is slidably connected to the relief groove (413).

2. The automated bending device for metal wire according to claim 1, characterized in that: The upper template (501) is symmetrically provided with two sets of sliders (5011) on the back side. The sliders (5011) are slidably connected to the slide rails (5012), and the slide rails (5012) are fixedly installed on the fixed base (1).

3. The automated bending device for metal wire according to claim 2, characterized in that: A limiting mechanism (7) is provided between the upper template (501) and the lower mold base (504), and the limiting mechanism (7) includes two sets of limiting shafts (701). One end of the limiting shaft (701) is rotatably connected to the movable plate (702); The third cylinder (703) is fixedly installed on the back side of the fixed base (1), and the output end of the third cylinder (703) is fixedly connected to the movable plate (702).

4. The automated bending device for metal wire according to claim 3, characterized in that: Two sets of guide grooves (7021) are symmetrically arranged on one side of the movable plate (702). The guide grooves (7021) are slidably connected to the guide rails (704), and the guide rails (704) are fixedly installed on the fixed base (1).

5. The automated bending device for metal wire according to claim 4, characterized in that: The fixing seat (1) is also provided with two sets of rectangular through holes (103), and the two sets of limiting shafts (701) pass through the two sets of rectangular through holes (103) respectively. The fixing seat (1) is also provided with a baffle (102) for limiting the wire.

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