Automatic unwinding and tensioning device

Abstract

The utility model belongs to the technical field of unwinding, and provides an automatic unwinding tensioning device which comprises a base, a reel is rotatably mounted on the base, and a flat wire is wound on the reel; an automatic tensioning unit is arranged on the side face of the base and comprises a frame. The frame is fixedly installed on the side face of the base, an arc wheel mechanism is installed on the frame in a sliding mode, and a flat wire is wound around the arc wheel mechanism. A balancer is connected to the frame and located on the side, away from the base, of the frame. The rope working end of the balancer is connected with the arc wheel mechanism; the balancer is a spring balancer, a coil spring enabling the rope to generate tensioning force is arranged in the balancer, the flat wire wound on the arc wheel mechanism has the tensioning force, and therefore the situation that due to inertia, a reel rotates to release the flat wire excessively, the flat wire is disengaged from a semicircular wheel of the automatic tensioning unit, and wire feeding errors are caused is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of unwinding, and particularly relates to an automatic unwinding and tensioning device. Background Art

[0002] During production, the flat wire incoming material is in a roll, and it needs to go through a series of steps such as unwinding and straightening to reach the final usable state. Among them, in order to ensure the accuracy of straightening and wire feeding and a certain reserved amount required for wire feeding, the coil needs to be pre-unwound by a certain length, and the unwound length needs to have a certain tension force.

[0003] In the current mainstream solutions on the market, one is to directly pull the reel through the subsequent wire pulling. However, the existing problem is that due to the inertial force caused by pulling, the reel will unwind more wire, and the overall is relatively loose, resulting in the wire breaking away and knotting. The other is to unwind through a spring mechanism and a proximity switch, and there is also a form of counterweight with weights. However, in the form of a spring and a proximity switch, the constancy of the tension force and timely unwinding cannot be guaranteed; the form of counterweight with weights requires a large space.

[0004] Therefore, a structure that can provide a tension force is needed to achieve automatic unwinding. Content of the Utility Model

[0005] In view of the above problems, the utility model provides an automatic unwinding and tensioning device, including a base,

[0006] A reel is rotatably installed on the base, and a flat wire is wound around the reel;

[0007] An automatic tensioning unit is arranged on the side of the base. The automatic tensioning unit includes a frame; the frame is fixedly installed on the side of the base, and an arc wheel mechanism is slidably installed on the frame. A flat wire is wound around the arc wheel mechanism; a balancer is connected to the frame, and the balancer is located on the side of the frame away from the base; the working end of the rope of the balancer is connected to the arc wheel mechanism; and when the reel unwinds excess flat wire, it controls the arc wheel mechanism to retract to tension the excess flat wire;

[0008] A unwinding drive unit is arranged on the base; the unwinding drive unit is in transmission connection with the reel. Further, a slide rail and slider are arranged between the arc wheel mechanism and the frame, and the arc wheel mechanism and the frame are respectively connected to the slider and the slide rail of the slide rail and slider.

[0009] Furthermore, the arc wheel mechanism includes an L-shaped plate, which is located outside the frame, and the inner surface of the L-shaped plate is connected to the slider; a tangential second driven wheel and a semicircular wheel are provided on the outer surface of the L-shaped plate; the inner ring of the semicircular wheel is rotatably mounted with a first driven wheel, and the outer ring of the first driven wheel is simultaneously inscribed in the semicircular wheel and circumscribed in the second driven wheel; a gap is provided between the second driven wheel and the first driven wheel for the flat wire to pass through.

[0010] Furthermore, a limiting roller is provided on the outer side of the arc side of the semicircular wheel.

[0011] Furthermore, the automatic tensioning unit further comprises an auxiliary wheel, which is fixedly mounted on the outer surface of the frame away from the base; the rope connection end of the balancer passes around the auxiliary wheel and is fixedly connected to the balancer.

[0012] Furthermore, the automatic tensioning unit also includes a laser rangefinder; the laser rangefinder is fixedly mounted on the frame and located between the arc wheel mechanism and the auxiliary wheel; the laser rangefinder is electrically connected to the unwinding motor.

[0013] Furthermore, the base includes a first connecting plate, which is connected to the second connecting plate through a support plate, and the first connecting plate is parallel to the second connecting plate; frames are installed on the sides of the support plate and the second connecting plate, and a reel is rotatably installed on the support plate.

[0014] Furthermore, the unwinding drive unit includes an unwinding motor, a first cylindrical roller and a second cylindrical roller.

[0015] The first cylindrical roller and the second cylindrical roller are both rotatably mounted on the support plate and are located below the reel; the reel is in contact with the first cylindrical roller and the second cylindrical roller respectively; the unwinding motor is fixedly mounted on the first connecting plate and is located on the side of the first cylindrical roller away from the second cylindrical roller; the unwinding motor is transmission-connected to the first cylindrical roller.

[0016] Furthermore, the unwinding drive unit also includes a synchronous belt, a first synchronous wheel and a second synchronous wheel. The motor shaft of the unwinding motor is provided with a first synchronous wheel, and the first synchronous wheel is transmission-connected to the second synchronous wheel provided on the first cylindrical roller through a synchronous belt.

[0017] Furthermore, the device further comprises a straightening unit, which is mounted on the side surface of the second connecting plate and is located above the reel.

[0018] Furthermore, the straightening unit includes a horizontal straightening mechanism and a vertical straightening mechanism.

[0019] The horizontal straightening mechanism and the vertical straightening mechanism are both installed on the side surface of the second connecting plate, and the vertical straightening mechanism is located between the horizontal straightening mechanism and the circular arc wheel mechanism.

[0020] Beneficial effects:

[0021] 1. The utility model is provided with a balancer, which is a spring balancer. A coil spring is provided inside the balancer to generate tension in the rope. The spring balancer is connected to the circular arc wheel mechanism so that the flat wire wound on the circular arc wheel mechanism has tension, thereby preventing the reel from rotating too much and releasing the flat wire due to inertia, causing the flat wire to detach from the semicircular wheel of the automatic tensioning unit and cause wire feeding errors. At the same time, since the spring balancer itself is small in size and has stable performance, after adopting the spring balancer, the device occupies a small space and can also provide constant tension.

[0022] 2. The utility model sets a laser rangefinder, which detects in real time when the distance between the laser rangefinder and the arc wheel mechanism reaches the maximum value. The laser rangefinder notifies the unwinding motor to unwind, thereby realizing automatic unwinding.

[0023] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 The figure shows the overall schematic diagram of the automatic unwinding and tensioning device in the embodiment of the present utility model.

[0026] Figure 2 A schematic diagram of a coil placement unit and an unwinding drive unit in an embodiment of the present utility model is shown.

[0027] Figure 3 The figure shows a schematic structural diagram of the automatic tensioning unit in an embodiment of the present utility model.

[0028] Figure 4 Another perspective view of the automatic tensioning unit in the embodiment of the present invention is shown.

[0029] In the figure, 1 is the coil material placing unit; 10 is the base; 101 is the first connecting plate; 102 is the support plate; 103 is the second connecting plate; 11 is the coil reel.

[0030] 2 is the unwinding driving unit; 20 is the unwinding motor; 21 is the synchronous belt; 22 is the first synchronous pulley; 23 is the second synchronous pulley; 24 is the first cylindrical roller track; 25 is the second cylindrical roller track.

[0031] 3 is the automatic tensioning unit; 30 is the frame; 31 is the arc wheel mechanism; 311 is the semi-circular wheel; 312 is the L-shaped plate; 313 is the first driven wheel; 314 is the second driven wheel; 315 is the limit roller.

[0032] 32 is the slide rail slider; 33 is the laser rangefinder; 34 is the auxiliary wheel; 35 is the balancer.

[0033] 4 is the straightening unit; 40 is the horizontal straightening mechanism; 41 is the vertical straightening mechanism.

[0034] 5 is the flat wire. Specific embodiments

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0036] As Figure 1 shown, Figure 1 the overall schematic diagram of the automatic unwinding and tensioning mechanism in the embodiment of the present invention is shown. Referring to Figure 1 , an automatic unwinding and tensioning device includes a coil material placing unit 1. The coil material placing unit 1 includes a base 10 and a coil reel 11. The coil reel 11 is rotatably installed on the base 10; the flat wire 5 wound around the coil reel 11 passes through the arc wheel mechanism 31; an automatic tensioning unit 3 is arranged on the side of the base 10. The automatic tensioning unit 3 includes a frame 30. The frame 30 is fixedly installed on the side of the base 10, and the arc wheel mechanism 31 is horizontally slidably installed on the frame 30 (refer to Figure 1, F is the direction of pulling the wire, and the arc wheel mechanism 31 can slide back and forth along the direction of F), the flat wire 5 is installed on the arc wheel mechanism 31; the frame 30 is connected to a balancer 35, the balancer 35 is a spring balancer, and a coil spring and a rope are provided in the spring balancer, and the coil spring makes the rope have a tensioning force, and the spring balancer is located on the side of the arc wheel mechanism 31 away from the reel 11; the rope connection end of the spring balancer is connected to the arc wheel mechanism 31 and provides a tensioning force; the base 10 is provided with an unwinding drive unit 2; the unwinding drive unit 2 drives the reel 11 to rotate and release the flat wire 5. The spring balancer has a built-in spring and a suspension rope, and the coil spring can provide a pre-tightening force to the suspension rope. The suspension rope is connected to the arc wheel mechanism 31 and plays the role of generating a tensioning force to prevent the reel 11 from rotating too much and releasing the flat wire 5 due to inertia, so that the flat wire 5 is separated from the semicircular wheel 311 of the automatic tensioning unit 3, resulting in a feeding error. One end of the weight is connected to the arc wheel mechanism 31 by using the rope of the spring balancer. The spring balancer generates a tensioning force on the arc wheel mechanism 31, so that the flat wire 5 installed on the arc wheel mechanism 31 has a tensioning force. Since the spring balancer is an existing mature technology, it is small in size and has stable performance. Therefore, after using the spring balancer, the device occupies a small space while being able to provide a constant tensioning force.

[0037] The balancer 35 may also be a pneumatic balancer or a hydraulic balancer, both of which can generate tensioning force, which will not be described here.

[0038] Specifically, the base 10 includes a first connecting plate 101, a support plate 102 and a second connecting plate 103. The first connecting plate 101, the support plate 102 and the second connecting plate 103 are connected to form an I-shape. The first connecting plate 101 is connected to the ground and serves as a base plate; the support plate 102 connects the first connecting plate 101 and the second connecting plate 103; a reel 11 is rotatably arranged on the first connecting plate 101, and a frame 30 is installed on the side of the support plate 102 and the second connecting plate 103. The reel 11 and the unwinding motor 20 are placed on the lower side of the overall mechanism through structural optimization, thereby increasing space utilization and reducing floor space.

[0039] In the present invention, the frame 30 is a right-angled tripod, wherein the first right-angled side (vertical right-angled side) is fixedly mounted on the side of the base 10, and the second right-angled side (horizontal right-angled side) is slidably mounted on the arc wheel mechanism 31. The second right-angled side is located above the first right-angled side. A slide block 32 is provided between the frame 30. The slide rail of the slide block 32 is fixedly connected to the frame 30, and the slide block of the slide block 32 is fixedly connected to the arc wheel mechanism 31; the slide rail and the slide block are in sliding connection. In other words, the slide rail of the slide block 32 is fixedly mounted on the outside of the second right-angled side.

[0040] like Figure 3 As shown,Figure 3 The figure shows the structure of the automatic tensioning unit in the embodiment of the present invention. Figure 3 The arc wheel mechanism 31 includes an L-shaped plate 312 (refer to Figure 4 ), the L-shaped plate 312 is buckled on the outside of the frame 30, and the inner surface of the L-shaped plate 312 is connected to the slider; the second driven wheel 314, the first driven wheel 313 and the semicircular wheel 311 are arranged on the outer surface of the L-shaped plate 312 from top to bottom in sequence; the second driven wheel 314 and the first driven wheel 313 are installed opposite to each other and the two are tangent to each other, and a gap is provided between the second driven wheel 314 and the first driven wheel 313 for the flat wire 5 to pass through; the first driven wheel 313 is located on the inner circle of the semicircular wheel 311, and the outer circle of the first driven wheel 313 is inscribed in the semicircular wheel 311. The L-shaped plate 312 is buckled on the second right-angled side, and the second driven wheel 314 is rotatably set above the outer surface of the horizontal plate of the L-shaped plate 312, the first driven wheel 313 is rotatably set on the outer side of the vertical plate on the outer surface of the L-shaped plate 312, and the semicircular wheel 311 is fixedly set on the outer side of the vertical plate on the outer surface of the L-shaped plate 312; a groove is provided on the outer side of the semicircular wheel 311 for the flat wire 5 to pass through.

[0041] Among them, a larger semicircular wheel 311 is set to ensure that the flat wire 5 is not bent too small, which is convenient for subsequent straightening. A slide rail slider 32 is set to be connected to the arc wheel mechanism 31 to ensure that the automatic tensioning unit 3 can move smoothly back and forth when the subsequent mechanism pulls the wire or unwinds.

[0042] Specifically, a limiting roller 315 is provided on the outer side of the arc side of the semicircular wheel 311. The limiting roller 315 is used to limit the flat wire 5 and prevent it from escaping from the semicircular wheel 311. The automatic tensioning unit 3 also includes an auxiliary wheel 34, which is fixedly mounted on the frame 30 and located on the upper surface of the arc wheel mechanism 31 away from the base 10; one end of the rope of the balancer 35 used to connect the weight is fixedly connected to the balancer 35 through the auxiliary wheel 34. The auxiliary wheel 34 serves to adjust the direction of the rope of the balancer 35. The automatic tensioning unit 3 also includes a laser rangefinder 33, which is fixedly mounted on the frame 30 and located between the arc wheel mechanism 31 and the auxiliary wheel 34; the laser rangefinder 33 is electrically connected to the unwinding motor 20. The laser rangefinder 33 detects the distance between itself and the arc wheel mechanism 31 in real time, and when it reaches the maximum value, it notifies the unwinding motor 20 to unwind.

[0043] The laser rangefinder 33 is used to monitor the unwinding length in real time, and the unwinding is linked with the unwinding motor 20 in time to avoid unwinding in time. Especially when producing multiple varieties of products, different unwinding positions can be set according to different products.

[0044] refer to Figure 2The unwinding drive unit 2 includes an unwinding motor 20, a first cylindrical roller 24, and a second cylindrical roller 25. The first cylindrical roller 24 and the second cylindrical roller 25 are rotatably mounted on the support plate 102 and are located below the reel 11. The reel 11 is in contact with the first cylindrical roller 24 and the second cylindrical roller 25. The unwinding motor 20 is fixedly mounted on the base 10 and is located on the side of the first cylindrical roller 24 away from the second cylindrical roller 25. The unwinding motor 20 is in transmission connection with the first cylindrical roller 24. The unwinding motor 20 drives the first cylindrical roller 24 to rotate. Due to the action of gravity, the reel 11 contacts the first cylindrical roller 24 and the second cylindrical roller 25, generating friction, which in turn drives the reel 11 to rotate to release the flat wire 5, thereby achieving the purpose of unwinding. The unwinding drive unit 2 also includes a synchronous belt 21, a first synchronous wheel 22 and a second synchronous wheel 23. The first synchronous wheel 22 is provided on the motor shaft of the unwinding motor 20, and the first synchronous wheel 22 is transmission-connected to the second synchronous wheel 23 provided on the first cylindrical roller 24 through the synchronous belt 21.

[0045] Specifically, the device further includes a straightening unit 4, which is mounted on the second connecting plate 103 and is located above the reel 11. The straightening unit 4 includes a horizontal straightening mechanism 40 and a vertical straightening mechanism 41, both of which are mounted on the base 10, and the vertical straightening mechanism 41 is located between the horizontal straightening mechanism 40 and the arc wheel mechanism 31.

[0046] Working principle:

[0047] When the utility model is used, the reel 11 is placed on the axis of the base 10, and the reel 11 is able to contact the first cylindrical roller 24 and the second cylindrical roller 25; the end of the flat wire 5 on the reel 11 for straightening is passed through the gap between the semicircular wheel 311, the first driven wheel 313 and the second driven wheel 314 of the arc wheel mechanism 31 into the vertical straightening mechanism 41 and the horizontal straightening mechanism 40, and then connected to the wire feeding mechanism (not shown), and pulled through the wire feeding mechanism not shown; the rope of the balancer 35 is passed around the auxiliary wheel 34 and fixedly connected to the L-shaped plate 312 of the arc wheel mechanism 31.

[0048] Initially, the arc wheel mechanism 31 is in the original position (eg Figure 1At the rightmost end of the shown frame 30), the unwinding motor 20 does not work. When the wire feeding mechanism pulls the flat wire 5 in the F direction, the flat wire 5 is straightened by the horizontal straightening mechanism 40 and the vertical straightening mechanism 41, and pulls the flat wire 5 to overcome the tension force of the spring balancer (through an internal coil spring and a rope, the coil spring can provide a pre-tightening force to the hanging rope, that is, provide the tension force required by this device), and then pulls the arc wheel mechanism 31 to move along the slide rail slider 32 towards the straightening unit 4. At this time, the rope of the spring balancer is pulled out, and the coil spring generates a tension force. At the same time, the value of the distance detected by the laser rangefinder 33 from the arc wheel mechanism 31 continuously increases. When the value is greater than the set value, the system sends a signal to the unwinding motor 20 to trigger the unwinding motor 20 to work. The unwinding motor 20 drives the first synchronous pulley 22, and then drives the second synchronous pulley 23 and the first cylindrical roller path 24 to rotate through the synchronous belt 21, and then drives the reel 11 to rotate and release the flat wire 5. When the release work is completed and the unwinding motor 20 stops working, the reel 11 will release more flat wire 5 due to inertia, and the flat wire 5 located inside the straightening unit 4 cannot move due to friction; at this time, because the spring balancer is located at one end of the frame 30 close to the straightening unit 4, (the rope of the spring balancer is pulled out, and the coil spring generates a tension force), the arc wheel mechanism 31 generates a tension force through the spring balancer and moves away from the straightening unit 4, so as to tighten the excess flat wire 5 between the arc wheel mechanism 31 and the reel 11, preventing the reel 11 from releasing more flat wire 5 and being unable to ensure the constancy of the tension force and timely unwinding.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic unwinding and tensioning device, characterized in that, Comprising a base (10), A reel (11) is rotatably mounted on the base (10), and a flat wire (5) is wound around the reel (11); An automatic tensioning unit (3) is provided on the side of the base (10), and the automatic tensioning unit (3) includes a frame (30); the frame (30) is fixedly mounted on the side of the base (10), and an arc wheel mechanism (31) is slidably mounted on the frame (30), and a flat wire (5) is wound around the arc wheel mechanism (31); a balancer (35) is connected to the frame (30), and the balancer (35) is located on the side of the frame (30) away from the base (10); the rope working end of the balancer (35) is connected to the arc wheel mechanism (31); and when the reel (11) unwinds the excess flat wire (5), it controls the arc wheel mechanism (31) to retract to tension the excess flat wire (5); A pay-off driving unit (2) is provided on the base (10); the pay-off driving unit (2) is in transmission connection with the reel (11).

2. The automatic unwinding and tensioning device according to claim 1, characterized in that, A slide rail and slider (32) is provided between the arc wheel mechanism (31) and the frame (30), and the arc wheel mechanism (31) and the frame (30) are respectively connected to the slider and the slide rail of the slide rail and slider (32).

3. The automatic unwinding and tensioning device according to claim 2, wherein The arc wheel mechanism (31) includes an L-shaped plate (312), the L-shaped plate (312) is located outside the frame (30), and the inner surface of the L-shaped plate (312) is connected to the slider; a second driven wheel (314) and a semi-circular wheel (311) which are tangent are provided on the outer surface of the L-shaped plate (312); a first driven wheel (313) is rotatably mounted on the inner circle of the semi-circular wheel (311), and the outer circle of the first driven wheel (313) is simultaneously in internal tangency with the semi-circular wheel (311) and external tangency with the second driven wheel (314); a gap for the flat wire (5) to pass through is provided between the second driven wheel (314) and the first driven wheel (313).

4. An automatic unwinding and tensioning device according to claim 3, characterized in that, A limit roller (315) is provided outside the arc side of the semi-circular wheel (311).

5. The automatic unwinding and tensioning device according to claim 1, wherein The automatic tensioning unit (3) further includes an auxiliary wheel (34), and the auxiliary wheel (34) is fixedly mounted on the outer surface of the frame (30) away from the base (10); the rope connecting end of the balancer (35) bypasses the auxiliary wheel (34) and is fixedly connected to the balancer (35).

6. The automatic unwinding and tensioning device according to claim 5, characterized in that, The automatic tensioning unit (3) further includes a laser rangefinder (33); the laser rangefinder (33) is fixedly mounted on the frame (30) and is located between the arc wheel mechanism (31) and the auxiliary wheel (34); the laser rangefinder (33) is electrically connected to the pay-off motor (20).

7. An automatic unwinding and tensioning device according to claim 1, characterized in that The base (10) includes a first connecting plate (101), the first connecting plate (101) is connected to a second connecting plate (103) through a support plate (102), and the first connecting plate (101) is parallel to the second connecting plate (103); the frame (30) is mounted on the sides of the support plate (102) and the second connecting plate (103), and the reel (11) is rotatably mounted on the support plate (102).

8. An automatic unwinding and tensioning device according to claim 7, characterized in that, The unwinding drive unit (2) comprises an unwinding motor (20), a first cylindrical roller (24) and a second cylindrical roller (25). The first cylindrical roller (24) and the second cylindrical roller (25) are both rotatably mounted on the support plate (102) and are located below the reel (11); the reel (11) is in contact with the first cylindrical roller (24) and the second cylindrical roller (25) respectively; the unwinding motor (20) is fixedly mounted on the first connecting plate (101) and is located on a side of the first cylindrical roller (24) away from the second cylindrical roller (25); the unwinding motor (20) is transmission-connected to the first cylindrical roller (24).

9. The automatic unwinding and tensioning device according to claim 8, characterized in that, The unwinding drive unit (2) further comprises a synchronous belt (21), a first synchronous wheel (22) and a second synchronous wheel (23); the first synchronous wheel (22) is provided on the motor shaft of the unwinding motor (20); the first synchronous wheel (22) is connected to the second synchronous wheel (23) provided on the first cylindrical roller (24) through the synchronous belt (21).

10. An automatic unwinding and tensioning device according to claim 7, characterized in that, The device further comprises a straightening unit (4), which is mounted on the side surface of the second connecting plate (103), and the straightening unit (4) is located above the reel (11).

11. An automatic unwinding and tensioning device according to claim 10, characterized in that, The straightening unit (4) comprises a horizontal straightening mechanism (40) and a vertical straightening mechanism (41), The horizontal straightening mechanism (40) and the vertical straightening mechanism (41) are both installed on the side surface of the second connecting plate (103), and the vertical straightening mechanism (41) is located between the horizontal straightening mechanism (40) and the circular arc wheel mechanism (31).

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