Pay-off device for steel cord unwinding

Abstract

The present invention relates to the technical field of steel cord processing, and specifically provides a pay-off frame device for steel cord unrolling, comprising a mounting bracket; a pay-off drum, which is mounted on the mounting bracket and used for steel cord unrolling, and the pay-off drum is coaxially connected to a driving wheel; a magnetic tensioner, which is mounted on the mounting bracket and coaxially connected to a driven wheel; and a conveyor belt, which is sleeved on the outer wall of the driving wheel and the driven wheel. When the speed of the pay-off drum changes abnormally, the pressure applied to the tensioning wheel by the conveyor belt will change, and the pressure sensor senses the pressure increase and transmits a signal to the controller, and the controller controls the magnetic tensioner to convert the torque change to increase the damping force, control the speed of the driven wheel to slow down, and then control the speed of the driving wheel to slow down through the conveyor belt. Because the driving wheel is coaxially connected to the pay-off drum, the speed of the pay-off drum can be adjusted according to the pay-off tension, so that the speed of the pay-off drum tends to be stable.

Description

Technical Field

[0001] The invention relates to the technical field of steel cord processing, in particular to a pay-off frame device for steel cord spreading. Background Art

[0002] Steel cord is a special-purpose fine-gauge steel strand or rope made of high-quality high-carbon steel and plated with brass. It is mainly used for car tires, light truck tires, heavy truck tires, construction machinery tires, aircraft tires and other rubber product skeleton materials. In the processing of steel cord, it needs to go through the wiring (unrolling) stage, which is generally done by using a pay-off frame.

[0003] The prior art pay-off stand is generally provided with a tensioning wheel to adjust the tension during the wire unwinding process, but the tensioning wheel tensions the wire solely through the elastic force of a spring, and cannot adjust the tension according to the rotation speed of the wire winding.

[0004] In order to control the pay-off speed of the pay-off stand according to the tension and keep the steel cord at an appropriate tension during the routing process, a brake disc is usually added to the pay-off stand to control the rotation speed of the pay-off disc. However, the brake pad is prone to wear and slip during actual use, resulting in frequent wire jumping during routing due to speed changes during steel cord processing. Summary of the invention

[0005] The present invention aims to provide a pay-off stand device for steel cord unwinding in view of the defects of the prior art, comprising:

[0006] Mounting bracket;

[0007] A pay-off drum is mounted on the mounting bracket and is used for unwinding the steel cord, and the pay-off drum is coaxially connected to the driving wheel;

[0008] A magnetic tensioner is mounted on the mounting bracket, and the magnetic tensioner is coaxially connected to the driven wheel;

[0009] A conveyor belt is sleeved on the outer walls of the driving wheel and the driven wheel, so that the driving wheel acts as a driving wheel to drive the driven wheel to rotate;

[0010] A tension equalizing mechanism, including a tensioning wheel, connected to the outer wall of the conveyor belt and mounted to the mounting bracket, so that the conveyor belt is in a tensioned state;

[0011] Controller;

[0012] Wherein, a pressure sensor is arranged between the tensioning wheel and the mounting bracket, and the pressure sensor is used to detect the pressure of the conveyor belt pressing the tensioning wheel. The pressure sensor is electrically connected to the controller, and the controller is electrically connected to the magnetic tensioner.

[0013] As an optional embodiment, a mounting box is fixed on the mounting bracket, and the tensioning wheel is defined as a first position when it is at the bottom end of the mounting box and a second position when it is at the top end of the mounting box. The tensioning wheel slides linearly on the mounting box through a guide member, and when the conveyor belt is tightened, the tensioning wheel can move from the first position to the second position.

[0014] As an optional embodiment, the guide member includes a slide groove opened on the installation box, and the tensioning wheel slides linearly in the slide groove through a slider.

[0015] As an optional embodiment, the guide member includes an optical axis inserted into the interior of the installation box from top to bottom, and the tensioning wheel slides linearly along the optical axis via a slider.

[0016] As an optional embodiment, the guide member includes a slide groove opened on the installation box and an optical axis inserted into the installation box from top to bottom, the opening direction of the slide groove corresponds to the installation position of the optical axis, and the tensioning wheel slides linearly along the optical axis and the slide groove through a slider.

[0017] As an optional embodiment, an elastic connecting member is fixed to the top of the slider, defining the slider as a third position at the bottom of the guide member and a fourth position at the top of the guide member, and the slider can be automatically reset to the third position from the fourth position through the elastic connecting member.

[0018] As an optional implementation, the elastic connecting member includes a coil spring.

[0019] As an optional implementation, the pressure sensor is fixedly mounted on the tensioning wheel.

[0020] As an optional implementation, the pay-off reel is an I-shaped wheel.

[0021] As an optional implementation, the conveyor belt is a synchronous belt, and the driving wheel and the driven wheel are gears that match the synchronous belt.

[0022] As an optional embodiment, based on a pressure sensor for sensing pressure arranged between the tensioning wheel and the mounting bracket, when the rotation speed of the pay-off drum changes abnormally, the pressure sensor detects the pressure of the conveyor belt pressing the tensioning wheel, and the controller is configured to receive the pressure of the pressure sensor and control the damping force of the magnetic tensioner so that the rotation speed of the pay-off drum tends to stabilize.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] When the speed of the pay-off drum changes abnormally, the pressure applied by the conveyor belt to the tensioning wheel will change. The pressure sensor senses the pressure increase and transmits a signal to the controller. The controller controls the magnetic tensioner to convert the torque change to increase the damping force, thereby controlling the speed of the driven wheel to slow down, and then controls the speed of the driving wheel to slow down through the conveyor belt. Because the driving wheel is coaxially connected to the pay-off drum, the speed of the pay-off drum can be adjusted according to the pay-off tension, so that the speed of the pay-off drum tends to be stable, avoiding the jump of the steel cord during the unwinding process due to the abnormal speed of the pay-off drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0026] Figure 1 is a schematic structural diagram of a pay-off stand device for steel cord unwinding shown in an embodiment of the present invention;

[0027] Figure 2 is an electrical control diagram shown in an embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of a front cross-sectional structure of a tensioning wheel shown in an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of time and pressure of the change of the rotation speed of the pay-off reel shown in the embodiment of the present invention.

[0030] In the figure, 10, mounting bracket; 20, pay-off drum; 30, magnetic tensioner; 41, driving wheel; 42, conveyor belt; 43, driven wheel; 50, tension equalizing mechanism; 501, cavity; 51, mounting box; 52, optical axis; 54, slider; 55, elastic connector; 56, tensioning wheel; 57, pressure sensor; 60, controller. DETAILED DESCRIPTION

[0031] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0032] Combination Figure 1-3 As shown, a pay-off stand device for steel cord unwinding mainly comprises a mounting bracket 10, a pay-off drum 20, a magnetic tensioner 30, a transmission mechanism 40, a tension equalizing mechanism 50 and a controller 60.

[0033] Pay-off damping mechanism

[0034] The installation bracket 10, the pay-off drum 20, the magnetic tensioner 30, and the transmission mechanism 40 constitute a pay-off damping mechanism, which is intended to provide damping for the pay-off drum 20 during the unwinding process.

[0035] The mounting bracket 10 is a leg structure arranged on the pay-off frame, made of metal alloy, and used for mounting the pay-off reel 20, the magnetic tensioner 30, the tension equalizing mechanism 50, etc.

[0036] The pay-off reel 20 is an I-shaped wheel. Specifically, the I-shaped wheel is configured to be cylindrical, with a disc-shaped baffle on one side, and the cylindrical surface forms a winding shaft; an axial hole is provided in the center of the I-shaped wheel, which is placed on the shaft of the mounting bracket 10 so that the I-shaped wheel can rotate relative to the mounting bracket 10.

[0037] Furthermore, the pay-off drum 20 is coaxially connected to a driving wheel 41. The steel cord is wound on the pay-off drum 20. When the steel cord is pulled by an external driving device, the pay-off drum 20 is driven to rotate under the traction force of the steel cord, thereby driving the driving wheel 41 coaxially connected to the pay-off drum 20 to rotate.

[0038] Combination Figure 1 As shown, the magnetic tensioner 30 is mounted on the mounting bracket 10 through a triangular support, and is arranged on both sides of the mounting bracket 10 with the pay-off reel 20 . A driven wheel 43 is coaxially connected to one side of the magnetic tensioner 30 .

[0039] The magnetic tensioner 30 is a tension control device without mechanical friction that generates damping by converting torque changes into magnetic field. For example, the magnitude of the magnetic damping of the magnetic tensioner 30 can be changed by the controller 60, so that the driven wheel 43 generates different rotational resistances.

[0040] Furthermore, the driving wheel 41 and the driven wheel 43 are connected by a transmission belt 42 sleeved on the outer walls of the driving wheel 41 and the driven wheel 43. The transmission belt 42 is a synchronous belt, and the driving wheel 41 and the driven wheel 43 are gears that match the synchronous belt. In this way, the pay-off drum 20 drives the driving wheel 41 to rotate, and the driving wheel 41 can drive the driven wheel 43 to rotate through the transmission belt 42.

[0041] In an optional embodiment, the tensioning wheel 56 is a cylindrical structure, pressed against the outer wall of the conveyor belt 42, and its cross-sectional area is twice the width of the conveyor belt 42; of course, its cross-sectional area is not limited to twice the width of the conveyor belt 42, and a suitable width can also be selected according to actual use needs, as long as it is wider than the width of the conveyor belt 42.

[0042] As an optional embodiment, the tensioning wheel 56 has an inwardly recessed annular groove, the cross-sectional area of ​​which is slightly larger than the cross-sectional area of ​​the conveyor belt 42 . This can limit the transmission belt 42 and prevent the conveyor belt 42 from deviating from the tensioning wheel 56 .

[0043] Damping adjustment mechanism

[0044] The damping adjustment mechanism is mainly composed of a tension equalizing mechanism 50 and a controller 60 , and is intended to control the change in the damping of the magnetic tensioner 30 according to the change in the speed of the pay-off drum 20 , so as to suppress the abnormal change in the rotation speed of the pay-off drum 20 .

[0045] Due to the abnormal rotation speed of the pay-off drum 20, the pressure of the conveyor belt 42 pressing the tension wheel 56 will change. In order to detect the pressure change, a pressure sensor 57 is provided on the tension wheel 56.

[0046] In an optional embodiment, when the rotation speed of the pay-off reel 20 suddenly changes, for example, it suddenly becomes faster, the transmission belt 42 will be tensioned, and after being stretched straight, the pressure of the tensioning wheel 56 will increase. As a result, the pressure detected by the pressure sensor 57 will increase, which serves as feedback of the speed change or abnormality.

[0047] Further, such as Figure 2 As shown, the output end of the pressure sensor 57 is electrically connected to the controller 60 , and the output end of the controller 60 is electrically connected to the magnetic tensioner 30 .

[0048] Optionally, a pressure sensor 57 is installed on the bearing of the tensioning wheel 56. When the pressure sensor 57 detects a change in the pressure of the conveyor belt 42 pressing the tensioning wheel 56, the pressure signal is transmitted to the controller 60, and the damping force change of the magnetic tensioner 30 is controlled by the controller 60.

[0049] For example, when the pressure of the pressure sensor 57 increases, the controller 60 controls the magnetic tensioner 30 to increase the damping force. As a result, the rotation resistance of the driven wheel 43 coaxially connected to the magnetic tensioner 30 increases, making it difficult to increase the speed of the pay-off drum 20, thereby stabilizing its speed.

[0050] When the rotation speed of the pay-off reel 20 tends to be stable, the pressure sensor 57 detects the change in the pressure of the conveyor belt 42 compressing the tensioning wheel 56, and transmits the pressure signal to the controller 60. The controller 60 controls the magnetic tensioner 30 to reduce the damping force. The reduced resistance reduces the rotational resistance of the driven wheel 43 coaxially connected to the magnetic tensioner 30, so that the rotation speed of the pay-off reel 20 tends to be stable.

[0051] As an alternative example, Figure 4 The time and pressure curves of the pay-off drum speed change shown in the figure indicate that at time T1, the speed of the pay-off drum 20 is stable, and the pressure of the transmission belt 42 pressing the tension wheel 56 is P1.

[0052] At time T2, the rotation speed of the wire pay-off reel 20 increases. At this time, the pressure of the transmission belt 42 pressing on the tension pulley 56 is P2. As the rotation speed of the wire pay-off reel 20 increases, the transmission belt 42 becomes taut. At this time, P2 > P1, and the pressure detected by the pressure sensor 57 increases. The controller 60 receives the pressure signal of the pressure sensor 57 in real time. If within a detection period, ΔP = P2 - P1 > 0, the controller 60 sends a control command to the magnetic tensioner 30, and controls the magnetic tensioner 30 to increase the damping force according to the increased amount of pressure ΔP. As an optional example, the detection period can be configured or adjusted according to the actual production scenario. For example, the detection period is defined as 5 s.

[0053] In an alternative embodiment, the increase amount of the damping force has a linear correspondence with the increase amount of the pressure. In this way, the rotational resistance of the driven wheel 43 coaxially connected to the magnetic tensioner 30 increases, and the rotation speed of the wire pay-off reel 20 decreases. During this process, the pressure detected by the pressure sensor 57 gradually decreases from P2 to P1, and the damping force of the magnetic tensioner 30 also gradually returns to the original state, and the rotation speed of the wire pay-off reel 20 gradually stabilizes (close to the preset rotation speed).

[0054] It is defined that at time T3, the rotation speed of the wire pay-off reel 20 is stable, and the pressure of the transmission belt 42 pressing on the tension pulley 56 is P3. At this time, P3 = P1.

[0055] If at time T4, the rotation speed of the wire pay-off reel 20 decreases, as the rotation speed of the wire pay-off reel 20 decreases, the transmission belt 42 becomes slack. At this time, the pressure P4 of the transmission belt 42 pressing on the tension pulley 56 < P3, and the pressure detected by the pressure sensor 57 decreases. The controller 60 detects the pressure input signal of the pressure sensor 57 in real time. Within a detection period, ΔP = P4 - P3 < 0, and the controller 60 sends a control command to the magnetic tensioner 30, and controls the magnetic tensioner 30 to decrease the damping force according to the decreased amount of pressure ΔP.

[0056] In an alternative embodiment, the decrease amount of the damping force has a linear correspondence with the decrease amount of the pressure. The rotational resistance of the driven wheel 43 decreases, and the rotation speed of the wire pay-off reel 20 increases. During this process, the pressure detected by the pressure sensor 57 gradually increases from P4 to P4, and the damping force of the magnetic tensioner 30 also gradually returns to the original state, and the rotation speed of the wire pay-off reel 20 gradually stabilizes (close to the preset rotation speed).

[0057] It is defined that at time T5, the rotation speed of the wire pay-off reel 20 is stable, and the pressure of the transmission belt 42 pressing on the tension pulley 56 is P5. At this time, P5 = P1 = P3, and the magnetic tensioner 30 does not act.

[0058] In this way, through the above closed-loop control, the speed variation of the wire pay-off reel 20 can be suppressed, the steel cord can be prevented from jumping due to excessive tension during the pay-off process, and the stability of the steel cord pay-off can be improved.

[0059] Setting Example 1 of the tensioning wheel

[0060] like Figure 1 and Figure 3 As shown, the mounting bracket 10 is fixed with a mounting box 51, and the mounting box 51 is detachably connected to the mounting bracket 10, so as to facilitate later disassembly, assembly and replacement, for example, by bolt connection.

[0061] The tension wheel 56 is defined as being at the bottom end of the mounting box 51 as a first position, and being at the top end of the mounting box 51 as a second position. The tension wheel 56 slides linearly on the mounting box 51 through a guide member. When the conveyor belt 42 is tightened, the tension wheel 56 can move from the first position to the second position to achieve tension adjustment of the conveyor belt 42.

[0062] Furthermore, the guide member includes a slide groove 511 opened on the installation box 51, and the tensioning wheel 56 slides linearly in the slide groove 511 through the slider 54. The slider 54 is slidably connected to the slide groove 511, and the tensioning wheel 56 is threadedly connected to the slider 54. In this way, the linear movement of the slider 54 in the slide groove 511 can drive the tensioning wheel 56 to slide linearly along the slide groove 511, thereby realizing the position change of the tensioning wheel 56 between the first position and the second position.

[0063] Setting Example 2 of the tension wheel

[0064] The difference from Example 1 is that the guide member includes an optical axis 52 inserted into the inside of the installation box 51 from top to bottom, and the tensioning wheel 56 slides linearly along the optical axis 52 through the slider 54. A through hole matching the optical axis 52 is opened on the inner side of the slider 54, and the optical axis 52 is passed through the through hole to realize the sliding connection between the slider 54 and the optical axis 52. The tensioning wheel 56 is threadedly connected to the slider 54. In this way, the slider 54 moves linearly along the optical axis 52, which can drive the tensioning wheel 56 to slide linearly along the optical axis 52, thereby realizing the position change of the tensioning wheel 56 between the first position and the second position.

[0065] Setting Example 3 of the tension wheel

[0066] The difference from Example 1-2 is that the guide member includes a slide groove 511 opened on the installation box 51 and an optical axis 52 inserted into the installation box 51 from top to bottom, the opening direction of the slide groove 511 corresponds to the installation position of the optical axis 52, and the tensioning wheel 56 slides linearly along the optical axis 52 and the slide groove 511 through the slider 54.

[0067] The side of the slider 54 is slidably connected to the slide groove 511, and is sleeved on the optical axis 52 through a through hole opened on the inner side, and is slidably connected to the optical axis 52. The tensioning wheel 56 is screwed on the front side of the slider 54, and the optical axis 52 is installed in the middle position opposite to the slide groove 511. In this way, the slider 54 can drive the tensioning wheel 56 to slide linearly along the slide groove 511 and the optical axis 52, so that the linear movement of the tensioning wheel 56 is more stable.

[0068] In order to allow the tensioning wheel 56 to move elastically on the installation box 51 and to always apply a downward pressing force to the conveyor belt 42, an elastic connecting member 55 is fixed to the top end of the slider 54.

[0069] The slider 54 is defined as being in the first position at the bottom end of the guide member and in the second position at the top end of the guide member. The slider 54 can be automatically reset from the second position to the first position through the elastic connecting member 55, so that the position of the tensioning wheel 56 can be automatically adjusted according to the change in the tightness of the conveyor belt 42, so that the tensioning wheel 56 is always pressed against the outer wall of the conveyor belt 42.

[0070] Specifically, the elastic connecting member 55 adopts a coil spring with an elastic deformation amount of up and down compression. The elastic force of the coil spring is used to make the tensioning wheel 56 always apply a downward pressing force to the transmission belt 42 to make the conveyor belt 42 too loose or too tight. The tensioning wheel 56 is always pressed downward against the outer side of the conveyor belt 42, and the elastic force of the coil spring is used to ensure that the conveyor belt 42 is in a tensioned state.

[0071] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A pay-off stand device for steel cord unwinding, characterized in that: include: Mounting bracket (10); A pay-off drum (20) is mounted on the mounting bracket (10) and is used for unwinding the steel cord, the pay-off drum (20) being coaxially connected to a driving wheel (41); A magnetic tensioner (30) is mounted on the mounting bracket (10), and the magnetic tensioner (30) is coaxially connected to the driven wheel (43); A conveyor belt (42) is sleeved on the outer walls of the driving wheel (41) and the driven wheel (43), so that the driving wheel (41) acts as a driving wheel to drive the driven wheel (43) to rotate; A tensioning wheel (56) connected to the outer wall of the conveyor belt (42) and mounted to the mounting bracket (10) so that the conveyor belt (42) is in a tensioned state; Controller (60); A pressure sensor (57) is provided between the tensioning wheel (56) and the mounting bracket (10), and the pressure sensor (57) is used to detect the pressure of the conveyor belt (42) pressing the tensioning wheel (56). The pressure sensor (57) is electrically connected to the controller (60), and the controller (60) is electrically connected to the magnetic tensioner (30). According to the change of the speed of the pay-off reel (20), the pressure sensor (57) detects the change of the pressure of the conveyor belt (42) pressing the tensioning wheel (56), and transmits the pressure signal to the controller (60). The controller (60) can change the magnitude of the magnetic damping of the magnetic tensioner (30), so that the driven wheel (43) generates different rotational resistances; Wherein, the pay-off reel (20) is an I-shaped wheel; The conveyor belt (42) is a synchronous belt, and the driving wheel (41) and the driven wheel (43) are gears that match the synchronous belt.

2. The pay-off stand device for steel cord unwinding according to claim 1, characterized in that: A mounting box (51) is fixed on the mounting bracket (10), and the tension wheel (56) is defined as a first position when it is at the bottom end of the mounting box (51), and a second position when it is at the top end of the mounting box (51). The tension wheel (56) slides linearly on the mounting box (51) through a guide member. When the conveyor belt (42) is tightened, the tension wheel (56) can move from the first position to the second position.

3. The pay-off stand device for steel cord unwinding according to claim 2, characterized in that: The guide member comprises a slide groove (511) formed on the installation box (51), and the tension wheel (56) slides linearly in the slide groove (511) via a slider (54).

4. The pay-off stand device for steel cord unwinding according to claim 2, characterized in that: The guide member comprises an optical axis (52) inserted into the interior of the installation box (51) from top to bottom, and the tension wheel (56) slides linearly along the optical axis (52) via a slider (54).

5. The pay-off stand device for steel cord unwinding according to claim 2, characterized in that: The guide member comprises a slide groove (511) formed on the installation box (51) and an optical axis (52) inserted into the installation box (51) from top to bottom. The opening direction of the slide groove (511) corresponds to the installation position of the optical axis (52). The tension wheel (56) slides linearly along the optical axis (52) and the slide groove (511) via a slider (54).

6. The pay-off stand device for steel cord unwinding according to claim 3, 4 or 5, characterized in that: An elastic connecting member (55) is fixed to the top of the slider (54), and the slider (54) is defined as being in a third position at the bottom of the guide member and in a fourth position at the top of the guide member. The slider (54) can be automatically reset from the fourth position to the third position through the elastic connecting member (55).

7. The pay-off stand device for steel cord unwinding according to claim 6, characterized in that: The elastic connecting member (55) comprises a coil spring.

8. The pay-off stand device for steel cord unwinding according to claim 1, characterized in that: The pressure sensor (57) is fixedly mounted on the tensioning wheel (56).

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