Wire unwinding and feeding device

Abstract

The utility model discloses a kind of wire rod unwinding feeding device, including rack, mounting shaft, unwinding mechanism, feeding mechanism, lifting block, abutment component and detection sensor;Wherein, the lifting block is slidably connected on the rack, the abutment component is connected on the lifting block, the mounting shaft is rotatably connected on the rack, the mounting shaft is used for installing reel, the wire rod in the reel is used to pass through the unwinding mechanism from the below of the abutment component after then extend into the feeding mechanism, the feeding mechanism is used to drive the wire rod to move forward and feed to make the wire rod between unwinding mechanism and feeding mechanism be pulled tight to be pulled tight by wire rod and drive abutment component and lifting block to slide up and rise.The utility model can make wire rod steady unwinding, can avoid the problem that wire rod unwinds too slowly or unwinds too fast, to avoid affecting normal feeding of wire rod and can avoid wire rod scattered roll.

Description

Technical Field

[0001] This utility model relates to a wire unwinding and feeding device. Background Technology

[0002] Currently, a thermal protector is a device used to protect equipment or circuits from overheating damage. In the production process of a thermal protector, silver contacts need to be welded onto a base plate. Chinese patent CN208019610U discloses an automatic welding machine for silver contacts to a copper base plate in a thermal protector. In this automatic welding machine, silver wire is wound on a coil roller. After being unwound from the coil roller, the silver wire passes through a straightening mechanism, a feeding mechanism, a cutting mechanism, and a feeding mechanism in sequence. The feeding mechanism is used to drive the silver wire to move, the cutting mechanism is used to cut the silver wire to form silver contacts, and the feeding mechanism is used to move the silver contacts to the base plate. Then, the silver contacts and the base plate are welded and fixed by a welding device. Among them, silver wire is a type of silver wire. In this automatic welding machine, the silver wire is wound on a winding roller. The winding roller is driven by a motor to rotate, thereby unwinding the wire. However, in actual production, it has been found that it is difficult to match the unwinding speed of the motor-driven winding roller with very accurate speed. The problem of unwinding speed mismatch often occurs. This usually manifests as unwinding too slowly, which affects the normal feeding of the wire, or unwinding too fast, which causes the wire to unwind. Unwinding will cause the wire to become tangled and knotted, forcing production to stop. Therefore, in the existing technology, relying solely on the rotation of the winding roller driven by a motor cannot achieve stable unwinding of the wire. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a wire unwinding and feeding device that can stably unwind the wire, avoid the problem of unwinding the wire too slowly or too quickly, and thus avoid affecting the normal feeding of the wire and prevent the wire from unwinding.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a wire unwinding and feeding device, including a frame, a mounting shaft, an unwinding mechanism, a feeding mechanism, a lifting block, a contacting component, and a detection sensor;

[0005] The lifting block is slidably connected to the frame.

[0006] The abutting component is connected to the lifting block;

[0007] The mounting shaft is rotatably connected to the frame, and a drum is mounted on the mounting shaft. The wire in the drum passes through the unwinding mechanism, passes under the abutment member, and then extends into the feeding mechanism.

[0008] The feeding mechanism is used to move the wire forward to feed it so that the portion of the wire located between the unwinding mechanism and the feeding mechanism is tightened, thereby driving the abutting component and the lifting block to slide upward through the tightened wire;

[0009] The detection sensor is connected to the frame and is used to detect the lifting block when the lifting block rises and send a signal to the unwinding mechanism;

[0010] The unwinding mechanism is used to clamp the wire and, after receiving a signal from the detection sensor, drives the wire to move a certain length in the direction of unwinding the drum, and then stops driving the wire to move, so that the portion of the wire located between the unwinding mechanism and the feeding mechanism slackens and droops, thereby causing the abutting component and the lifting block to slide down, so that the detection sensor cannot detect the lifting block.

[0011] Furthermore, the abutting component is a roller, which is rotatably connected to the lifting block.

[0012] Furthermore, the unwinding mechanism includes an unwinding motor, a drive wheel, a pressure wheel, a pressure seat, a pressure component, and a controller;

[0013] The drive wheel is rotatably connected to the frame;

[0014] The clamping seat is slidably connected to the frame;

[0015] The clamping wheel is rotatably connected to the clamping seat, and the wire in the spool is used to pass between the drive wheel and the clamping wheel, pass under the abutment member, and then extend into the feeding mechanism;

[0016] The clamping component is connected to the frame and is used to drive the clamping seat to move toward the drive wheel, thereby causing the clamping wheel and the drive wheel to clamp the wire;

[0017] The unwinding motor is connected to the drive wheel and is used to drive the drive wheel to rotate;

[0018] The detection sensor is connected to the controller and is used to send a signal to the controller when the raised lifting block is detected;

[0019] The controller is connected to the unwinding motor. When the controller receives a signal sent by the detection sensor, it controls the unwinding motor to rotate, thereby driving the drive wheel to rotate and drive the wire to move a certain length in the direction of unwinding the drum. Then, the controller controls the unwinding motor to stop rotating, thereby stopping the movement of the wire.

[0020] Furthermore, either the drive wheel or the clamping wheel is provided with a limiting groove for engaging with the wire, the depth of the limiting groove being less than the thickness of the wire.

[0021] Furthermore, the clamping component is a clamping device.

[0022] Furthermore, the wire unwinding and feeding device also includes a wire pressing component that is slidably connected to the frame. The wire pressing component has a wire pressing rod located above the wire on the drum. The wire pressing rod is used to press down on the wire on the drum to prevent the wire on the drum from unwinding.

[0023] Furthermore, the wire pressing component also includes a connecting block, a connecting rod, and at least two sliding rods;

[0024] The upper end of the sliding rod is connected to the connecting block, and the sliding rod is slidably connected to the frame in the vertical direction;

[0025] One end of the connecting rod is connected to the connecting block, and the pressing rod is connected to the other end of the connecting rod and is located above the wire on the drum and is used to press down on the wire on the drum.

[0026] Furthermore, the frame is also connected to a straightening mechanism for straightening the wire;

[0027] The wire in the spool is used to pass through the unwinding mechanism, then under the abutting member, then through the straightening mechanism, and finally into the feeding mechanism;

[0028] The feeding mechanism is used to move the wire forward to feed it so that the portion of the wire located between the unwinding mechanism and the straightening mechanism is tightened;

[0029] The unwinding mechanism is used to clamp the wire and, after receiving a signal from the detection sensor, drives the wire to move a certain length in the direction of unwinding the drum, and then stops driving the wire to move, so that the portion of the wire located between the unwinding mechanism and the straightening mechanism sags.

[0030] After adopting the above technical solution, a spool with wire wound on it is installed on the mounting shaft. The wire on the spool passes through the unwinding mechanism, then passes under the abutment member and extends into the feeding mechanism. At this time, the unwinding mechanism clamps the wire, and the feeding mechanism drives the wire to move forward and feed it. As the wire is continuously fed forward, the portion of the wire between the unwinding mechanism and the feeding mechanism is tightened. The tightened wire drives the abutment member to move upward, which in turn drives the lifting block to slide upward. When the detection sensor detects the rising lifting block, it generates a signal and sends it to the unwinding mechanism. After receiving the signal from the detection sensor, the unwinding mechanism drives the wire to move downward. When the wire moves downward, it drives the spool to rotate to achieve unwinding. When the unwinding mechanism drives the wire to move downward a certain length, it stops driving the wire downward. As the wire moves downward, the drum stops rotating and unwinding. At this time, the portion of the wire located between the unwinding mechanism and the feeding mechanism becomes loose and droops. Consequently, the abutment component and the lifting block slide downward under the action of gravity, making the lifting block undetectable by the detection sensor. Repeating the above process enables the feeding mechanism to stably drive the wire forward for feeding. Through the cooperation of the detection sensor and the unwinding mechanism, the unwinding mechanism drives the wire downward a certain length each time it receives a signal from the detection sensor, and then stops driving the wire downward. This allows the wire to be unwound while being taut and avoids unwinding too quickly, achieving stable unwinding of the wire. This not only avoids the wire being over-tightened due to slow unwinding, which would affect the normal feeding of the wire, but also avoids the problem of wire unwinding due to excessively fast unwinding. Attached Figure Description

[0031] Figure 1 This is a perspective view of the wire unwinding and feeding device of this utility model;

[0032] Figure 2 This is a front view of the wire unwinding and feeding device of this utility model;

[0033] Figure 3 This is a schematic diagram of the unwinding mechanism of this utility model;

[0034] Figure 4 This is a schematic diagram of the feeding mechanism, straightening mechanism, lifting block, contacting component, and detection sensor of this utility model;

[0035] Figure 5 This is a schematic diagram of the structure of the reel and the pressing component of this utility model;

[0036] In the diagram: 1. Frame; 2. Mounting shaft; 3. Unwinding mechanism; 4. Feeding mechanism; 5. Lifting block; 6. Abutting component; 7. Detection sensor; 8. Drum; 9. Wire; 10. Unwinding motor; 11. Drive wheel; 12. Pressing wheel; 13. Pressing seat; 14. Pressing component; 15. Limiting groove; 16. Moving cylinder; 17. First base; 18. Second base; 19. First material support section; 20. First channel; 21. Second material support section; 22. Second channel; 23. First pressing cylinder; 24. First pressing head; 25. Second pressing cylinder; 26. Second pressing head; 27. Wire pressing component; 28. Wire pressing rod; 29. ​​Connecting block; 30. Connecting rod; 31. Sliding rod; 32. Straightening mechanism; 33. Material sensor. Detailed Implementation

[0037] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0038] like Figures 1-5 As shown, a wire unwinding and feeding device includes a frame 1, a mounting shaft 2, an unwinding mechanism 3, a feeding mechanism 4, a lifting block 5, an abutment component 6, and a detection sensor 7.

[0039] The lifting block 5 is slidably connected to the frame 1.

[0040] The abutting component 6 is connected to the lifting block 5;

[0041] The mounting shaft 2 is rotatably connected to the frame 1. The mounting shaft 2 is used to mount the drum 8. The wire 9 in the drum 8 passes through the unwinding mechanism 3, passes under the abutment member 6, and then extends into the feeding mechanism 4.

[0042] The feeding mechanism 4 is used to drive the wire 9 forward to feed it so that the part of the wire 9 located between the unwinding mechanism 3 and the feeding mechanism 4 is tightened, and then the tightened wire 9 drives the abutting part 6 and the lifting block 5 to slide upward.

[0043] The detection sensor 7 is connected to the frame 1 and is used to detect the lifting block 5 when the lifting block 5 rises and send a signal to the unwinding mechanism 3.

[0044] The unwinding mechanism 3 clamps the wire 9 and, upon receiving a signal from the detection sensor 7, drives the wire 9 to move a certain length in the direction that causes the drum 8 to unwind, then stops driving the wire 9 to move. This allows the portion of the wire 9 located between the unwinding mechanism 3 and the feeding mechanism 4 to sag, causing the abutment member 6 and the lifting block 5 to slide down, making the lifting block 5 undetectable by the detection sensor 7. Specifically, the drum 8 with the wire 9 wound on it is mounted on the mounting shaft 2. The wire 9 on the drum 8 passes through the unwinding mechanism 3, passes under the abutment member 6, and then extends into the feeding mechanism 4. At this time, the unwinding mechanism 3 clamps the wire 9, and the feeding mechanism 4 drives the wire 9 forward for feeding. As the wire 9 is continuously fed forward, the portion of the wire 9 located between the unwinding mechanism 3 and the feeding mechanism 4 is tightened. Figure 1 As shown, the taut wire 9 will cause the abutment component 6 to move upward, thereby causing the lifting block 5 to slide upward. When the detection sensor 7 detects the rising lifting block 5, it will generate a signal and send it to the unwinding mechanism 3. After receiving the signal sent by the detection sensor 7, the unwinding mechanism 3 will drive the wire 9 to move downward. When the wire 9 moves downward, it will drive the drum 8 to rotate to achieve unwinding. When the unwinding mechanism 3 drives the wire 9 to move downward a certain length, it will stop driving the wire 9 to move downward, and then the drum 8 will stop rotating and stop unwinding. At this time, the part of the wire 9 located between the unwinding mechanism 3 and the feeding mechanism 4 will become loose and droop. Figure 2 As shown, the abutting component 6 and the lifting block 5 will slide down under the action of gravity, making the lifting block 5 undetectable by the detection sensor 7. Repeating the above process enables the feeding mechanism 4 to stably drive the wire 9 forward for feeding. Through the cooperation of the detection sensor 7 and the unwinding mechanism 3, the unwinding mechanism 3 will drive the wire 9 downward to a certain length each time it receives a signal sent by the detection sensor 7, and then stop driving the wire 9 downward. This allows the wire 9 to be unwound while being taut and avoids unwinding too quickly, achieving stable unwinding of the wire 9. This not only avoids the wire 9 being over-tightened due to slow unwinding, thus affecting the normal feeding of the wire 9, but also avoids the problem of the wire 9 unwinding too quickly. The wire 9 can be a silver wire.

[0045] like Figures 1-4 As shown, the abutting component 6 can be a roller, which is rotatably connected to the lifting block 5; specifically, the lifting block 5 is slidably connected to the frame 1 in the vertical direction via a linear guide rail, and the detection sensor 7 can be a photoelectric sensor.

[0046] like Figures 1-3 As shown, the unwinding mechanism 3 includes, but is not limited to, the following structure: an unwinding motor 10, a drive wheel 11, a pressure wheel 12, a pressure seat 13, a pressure component 14, and a controller.

[0047] The drive wheel 11 is rotatably connected to the frame 1;

[0048] The clamping seat 13 is slidably connected to the frame 1;

[0049] The clamping wheel 12 is rotatably connected to the clamping seat 13, and the wire 9 in the spool 8 is used to pass between the drive wheel 11 and the clamping wheel 12, pass under the abutment member 6, and then extend into the feeding mechanism 4;

[0050] The clamping component 14 is connected to the frame 1 and is used to drive the clamping seat 13 to move toward the drive wheel 11, thereby driving the clamping wheel 12 and the drive wheel 11 to clamp the wire 9;

[0051] The unwinding motor 10 is connected to the drive wheel 11 and is used to drive the drive wheel 11 to rotate;

[0052] The detection sensor 7 is connected to the controller and is used to send a signal to the controller when the raised lifting block 5 is detected;

[0053] The controller is connected to the unwinding motor 10. When the controller receives a signal sent by the detection sensor 7, it controls the unwinding motor 10 to rotate, thereby driving the drive wheel 11 to rotate and drive the wire 9 to move a certain length in the direction that causes the drum 8 to unwind. Then, the controller controls the unwinding motor 10 to stop rotating, thereby stopping the movement of the wire 9.

[0054] Specifically, because the clamping wheel 12 and the drive wheel 11 clamp the wire 9, when the feeding mechanism 4 continuously drives the wire 9 forward, the portion of the wire 9 located between the unwinding mechanism 3 and the feeding mechanism 4 will be tightened. When the controller receives the signal sent by the detection sensor 7, the controller will control the unwinding motor 10 to rotate a certain number of revolutions and then control the unwinding motor 10 to stop rotating. This will cause the wire 9 clamped by the drive wheel 11 and the clamping wheel 12 to move downwards by a certain length, so that the portion of the wire 9 located between the unwinding mechanism 3 and the feeding mechanism 4 will relax and sag, while preventing the wire 9 from unwinding too quickly and becoming unwound. The length by which the unwinding mechanism 3 drives the wire 9 downwards each time can be adjusted according to actual needs.

[0055] like Figure 3As shown, the drive wheel 11 is provided with a limiting groove 15 for engaging with the wire 9, and the depth of the limiting groove 15 is less than the thickness of the wire 9. Of course, in some embodiments, the limiting groove 15 can also be provided on the clamping wheel 12. In this embodiment, the clamping component 14 can be a clamping device, also known as a push-pull quick clamp, the specific structure of which is prior art well known to those skilled in the art.

[0056] like Figure 1 , 2As shown in Figure 4, the feeding mechanism 4 includes, for example but not limited to, the following structure: a first feeding assembly and a second feeding assembly. The first feeding assembly may include a moving cylinder 16, a first base 17, and a first pressing component. The second feeding assembly may include a second base 18 and a second pressing component. The first base 17 is connected to the moving cylinder 16 and has a first material support 19 and a first pressing component. The second base 18 is connected to the frame 1 and has a second material support 21 and a second pressing component. The wire 9 is used to pass through the top of the first material support 19 and the top of the second material support 21 and through the first pressing component and the first pressing component. The first pressing component is connected to the first base 17 and is used to press the wire 9 onto the first support portion 19. The second pressing component is connected to the second base 18 and is used to press the wire 9 onto the second support portion 21 when the first pressing component releases the wire 9 from the first support portion 19. The moving cylinder 16 is connected to the frame 1 and is used to drive the first base 17 forward when the first pressing component presses the wire 9 onto the first support portion 19 and the second pressing component releases the wire 9 from the second support portion 21, thereby driving the wire 9 pressed onto the first support portion 19 to move forward for feeding. Specifically, the first pressing component presses the wire 9 onto the first support portion 19, the second pressing component releases the wire 9 from the second support portion 21, and then the moving cylinder 16 drives the first base 17 forward, thereby moving the wire 9 pressed onto the first support portion 19 forward for feeding. Then, the second pressing component presses the wire 9 onto the second support portion 21, the first pressing component releases the wire 9 from the first support portion 19, and then the moving cylinder 16 drives the first base 17 backward to reset. Then, the first pressing component presses the wire 9 onto the first support portion 19 again, the second pressing component releases the wire 9 from the second support portion 21 again, and the moving cylinder 16 drives the first base 17 forward again, thereby moving the wire 9 pressed onto the first support portion 19 forward for feeding. This cycle continuously feeds the wire 9 forward. In this embodiment, the moving cylinder 16 can be a slide cylinder.More specifically, the first pressing component may include a first pressing cylinder 23 and a first pressing head 24. The first pressing head 24 is connected to the first pressing cylinder 23, which is connected to the first base 17 and is used to drive the first pressing head 24 to move to press the wire 9 onto the first material support 19. The first pressing cylinder 23 is also used to drive the first pressing head 24 to move to release the wire 9 from the first material support 19. The second pressing component may include a second pressing cylinder 25 and a second pressing head 26. The second pressing head 26 is connected to the second pressing cylinder 25, which is connected to the second base 18 and is used to drive the second pressing head 26 to move to press the wire 9 onto the second material support 21. The second pressing cylinder 25 is also used to drive the second pressing head 26 to move to release the wire 9 from the second material support 21. Of course, in some embodiments, other feeding mechanisms 4 with existing structures may also be used.

[0057] like Figure 1 , 2 As shown in Figure 5, the wire unwinding and feeding device may further include a wire pressing component 27 that is slidably connected to the frame 1. The wire pressing component 27 has a wire pressing rod 28 located above the wire 9 on the drum 8. The wire pressing rod 28 is used to press down on the wire 9 on the drum 8 to prevent the wire 9 on the drum 8 from unwinding.

[0058] like Figure 1 , 5 As shown, the wire pressing component 27 may also include a connecting block 29, a connecting rod 30, and at least two sliding rods 31;

[0059] The upper end of the sliding rod 31 is connected to the connecting block 29, and the sliding rod 31 is slidably connected to the frame 1 in the up and down direction;

[0060] One end of the connecting rod 30 is connected to the connecting block 29, and the pressing rod 28 is connected to the other end of the connecting rod 30 and is located above the wire 9 on the drum 8 and is used to press down on the wire 9 on the drum 8. Specifically, under the action of gravity, the pressing rod 28 will always press down on the wire 9 on the drum 8, which can prevent the wire 9 from unwinding and increase the resistance to the rotation of the drum 8.

[0061] like Figure 1 , 2 As shown in Figures 1 and 4, a straightening mechanism 32 for straightening the wire 9 can also be connected to the frame 1.

[0062] The wire 9 in the spool 8 passes through the unwinding mechanism 3, passes under the abutting member 6, then passes through the straightening mechanism 32, and extends into the feeding mechanism 4;

[0063] The feeding mechanism 4 is used to drive the wire 9 forward to feed it so that the part of the wire 9 located between the unwinding mechanism 3 and the straightening mechanism 32 is tightened, and then the tightened wire 9 drives the abutting part 6 and the lifting block 5 to slide upward.

[0064] The unwinding mechanism 3 clamps the wire 9 and, upon receiving a signal from the detection sensor 7, drives the wire 9 to move a certain length in the direction that causes the spool 8 to unwind, then stops driving the wire 9 to move. This causes the portion of the wire 9 located between the unwinding mechanism 3 and the straightening mechanism 32 to sag, thereby causing the abutment member 6 and the lifting block 5 to slide down, making the lifting block 5 undetectable by the detection sensor 7. Specifically, the specific structure of the straightening mechanism 32 is prior art well known to those skilled in the art and will not be described in detail in this embodiment. A material sensor 33 is also connected to the straightening mechanism 32, which is used to detect whether the wire 9 passes through the straightening mechanism 32.

[0065] In summary, the spool 8 with the wire 9 wound on it is mounted on the mounting shaft 2. The wire 9 on the spool 8 passes through the unwinding mechanism 3, then passes under the abutment member 6, and extends into the feeding mechanism 4. At this time, the unwinding mechanism 3 clamps the wire 9, and the feeding mechanism 4 drives the wire 9 to move forward and feed it. As the wire 9 is continuously fed forward, the portion of the wire 9 located between the unwinding mechanism 3 and the feeding mechanism 4 is tightened. The tightened wire 9 drives the abutment member 6 to move upward, which in turn drives the lifting block 5 to slide upward. When the detection sensor 7 detects the rising lifting block 5, it generates a signal and sends it to the unwinding mechanism 3. After receiving the signal from the detection sensor 7, the unwinding mechanism 3 drives the wire 9 to move downward. When the wire 9 moves downward, it drives the spool 8 to rotate to achieve unwinding. When the unwinding mechanism 3 drives the wire 9 to move downward a certain length, it stops driving the wire 9 downward. As the wire moves downward, the drum 8 stops rotating and stops unwinding. At this time, the portion of the wire 9 located between the unwinding mechanism 3 and the feeding mechanism 4 becomes loose and droops. Consequently, the abutting component 6 and the lifting block 5 slide downward under the action of gravity, making the lifting block 5 undetectable by the detection sensor 7. Repeating the above process enables the feeding mechanism 4 to stably drive the wire 9 forward for feeding. Through the cooperation of the detection sensor 7 and the unwinding mechanism 3, the unwinding mechanism 3 drives the wire 9 to move downward a certain length each time it receives a signal sent by the detection sensor 7, and then stops driving the wire 9 to move downward. This allows the wire 9 to be unwound while being taut and avoids unwinding too quickly, achieving stable unwinding of the wire 9. This not only avoids the wire 9 being over-tightened due to slow unwinding, which would affect the normal feeding of the wire 9, but also avoids the problem of the wire 9 unwinding too quickly.

[0066] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wire unwinding and feeding device, characterized in that, It includes a frame (1), mounting shaft (2), unwinding mechanism (3), feeding mechanism (4), lifting block (5), contacting component (6), and detection sensor (7); The lifting block (5) is slidably connected to the frame (1) up and down; The abutting component (6) is connected to the lifting block (5); The mounting shaft (2) is rotatably connected to the frame (1). The mounting shaft (2) is used to mount the drum (8). The wire (9) in the drum (8) is used to pass through the unwinding mechanism (3), pass under the abutment member (6), and then extend into the feeding mechanism (4). The feeding mechanism (4) is used to drive the wire (9) to move forward and feed it so that the part of the wire (9) located between the unwinding mechanism (3) and the feeding mechanism (4) is tightened, and then the tightened wire (9) drives the abutting part (6) and the lifting block (5) to slide upward. The detection sensor (7) is connected to the frame (1) and is used to detect the lifting block (5) when the lifting block (5) rises and to send a signal to the unwinding mechanism (3); The unwinding mechanism (3) is used to clamp the wire (9) and, after receiving a signal from the detection sensor (7), drives the wire (9) to move a certain length in the direction that causes the drum (8) to unwind, and then stops driving the wire (9) to move, so that the part of the wire (9) located between the unwinding mechanism (3) and the feeding mechanism (4) slackens and droops, thereby causing the abutting part (6) and the lifting block (5) to slide down, so that the detection sensor (7) cannot detect the lifting block (5).

2. The wire unwinding and feeding device according to claim 1, characterized in that, The abutting component (6) is a roller, which is rotatably connected to the lifting block (5).

3. The wire unwinding and feeding device according to claim 1, characterized in that, The unwinding mechanism (3) includes an unwinding motor (10), a drive wheel (11), a pressure wheel (12), a pressure seat (13), a pressure component (14), and a controller; The drive wheel (11) is rotatably connected to the frame (1); The clamping seat (13) is slidably connected to the frame (1); The clamping wheel (12) is rotatably connected to the clamping seat (13), and the wire (9) in the spool (8) is used to pass between the drive wheel (11) and the clamping wheel (12), pass under the abutment member (6), and then extend into the feeding mechanism (4); The clamping component (14) is connected to the frame (1) and is used to drive the clamping seat (13) to move toward the drive wheel (11), thereby driving the clamping wheel (12) and the drive wheel (11) to clamp the wire (9); The unwinding motor (10) is connected to the drive wheel (11) and is used to drive the drive wheel (11) to rotate; The detection sensor (7) is connected to the controller and is used to send a signal to the controller when the raised lifting block (5) is detected; The controller is connected to the unwinding motor (10). When the controller receives a signal sent by the detection sensor (7), it controls the unwinding motor (10) to rotate, thereby driving the drive wheel (11) to rotate so that the wire (9) moves a certain length in the direction that causes the drum (8) to unwind. Then, the controller controls the unwinding motor (10) to stop rotating, thereby stopping the movement of the wire (9).

4. The wire unwinding and feeding device according to claim 3, characterized in that, Either the drive wheel (11) or the clamping wheel (12) is provided with a limiting groove (15) for engaging with the wire (9), the depth of the limiting groove (15) being less than the thickness of the wire (9).

5. The wire unwinding and feeding device according to claim 3, characterized in that, The clamping component (14) is a clamping device.

6. The wire unwinding and feeding device according to claim 1, characterized in that, It also includes a wire pressing component (27) that is slidably connected to the frame (1) and has a wire pressing bar (28) located above the wire (9) on the drum (8). The wire pressing bar (28) is used to press down on the wire (9) on the drum (8) to prevent the wire (9) on the drum (8) from unwinding.

7. The wire unwinding and feeding device according to claim 6, characterized in that, The wire pressing component (27) also includes a connecting block (29), a connecting rod (30), and at least two sliding rods (31); The upper end of the sliding rod (31) is connected to the connecting block (29), and the sliding rod (31) is slidably connected to the frame (1) in the up and down direction; One end of the connecting rod (30) is connected to the connecting block (29), and the pressing rod (28) is connected to the other end of the connecting rod (30) and located above the wire (9) on the drum (8) and is used to press down on the wire (9) on the drum (8).

8. The wire unwinding and feeding device according to claim 1, characterized in that, The frame (1) is also connected to a straightening mechanism (32) for straightening the wire (9); The wire (9) in the spool (8) passes through the unwinding mechanism (3), passes under the abutment member (6), passes through the straightening mechanism (32), and extends into the feeding mechanism (4); The feeding mechanism (4) is used to drive the wire (9) forward to feed it so that the portion of the wire (9) located between the unwinding mechanism (3) and the straightening mechanism (32) is tightened; The unwinding mechanism (3) is used to clamp the wire (9) and, after receiving a signal sent by the detection sensor (7), drives the wire (9) to move a certain length in the direction that causes the drum (8) to unwind, and then stops driving the wire (9) to move, so that the part of the wire (9) located between the unwinding mechanism (3) and the straightening mechanism (32) sags.

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