A cutting machine unwinding wire tension control device

Abstract

The application discloses a cutting machine unwinding wire tension control device, which comprises an equipment machine table (1), the equipment machine table (1) is provided with a wire unwinding module (3) with a power driving mechanism and a wire winding module (2) with a power driving mechanism, a wire (7) is wound on the wire unwinding module (3), the equipment machine table (1) is further provided with a tension test assembly (6), the pulling end of the wire (7) is wound on the wire winding module (2) after passing through the tension test assembly (6), a transition wheel (5) is installed between the wire unwinding module (3) and the wire winding module (2), and a gravity wheel (8) with up-down activity ability is installed between the transition wheel (5) and the wire unwinding module (3). The application utilizes a gravity wheel and a transition wheel to solve the tension difference problem existing when the wire is wound and unwound.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cutting machine tool, in particular to a cutting machine tool unwinding wire tension control device. BACKGROUND

[0002] In the wire cut electrical discharge machine, the first generation technology is that the winding roller is driven by the active rotating motor, and the damping device such as the magnetic powder brake acts on the brake roller to control the tension, the second generation technology is that the winding roller and the brake roller are both driven by the active motor to control the speed difference of the two rollers to control the tension so as to meet the requirements.

[0003] The double-motor active driving control tension system is only related to the phase difference of the two active motors, as long as the speed difference of the two motors is adjusted in time, the tension value can be controlled, and the tension change caused by the friction force change of the brake roller before entering the brake roller and the pressing wheel on the brake roller is excluded, but the system only controls the response speed and accuracy of the motor, which puts forward high requirements, but the distance between the rollers is about half, and a few microns of driving error in such a small range will cause a great change in the tension, so the double-motor cost is high. SUMMARY

[0004] The technical problem to be solved by the present application is a cutting machine tool unwinding wire tension control device, by adding a transition wheel and a gravity wheel, the wire releasing module and the wire collecting module are synchronously operated, and the tension size is determined by the gravity wheel, when there is a speed difference between the two modules, the gravity wheel will move up and down, and the tension will not change, as long as the gravity wheel is controlled within the set height range, the system can be stably operated, and the deficiencies in the prior art are effectively solved.

[0005] The present application is realized by the following technical scheme: a cutting machine tool unwinding wire tension control device, comprising a device machine table, a wire releasing module with a power driving mechanism and a wire collecting module with a power driving mechanism are arranged on the device machine table, the wire is wound on the wire releasing module, a tension testing assembly is further arranged on the device machine table, the wire releasing end passes through the tension testing assembly and is wound on the wire collecting module, a transition wheel is installed between the wire releasing module and the wire collecting module, a gravity wheel with up and down movement ability is installed between the transition wheel and the wire releasing module, the wire is released from the wire releasing module, passes through the bottom of the gravity wheel and then passes through the top of the transition wheel and is connected to the wire collecting module, the tension generated during the wire conveying drives the gravity wheel to rise or fall, a height detection device is arranged in each of the up and down movement directions of the gravity wheel, and the height position of the gravity wheel is detected in real time through the height detection device.

[0006] As a preferred technical scheme, the wire releasing module, the gravity wheel and the transition wheel are in a "U" type structure, the weight of the gravity wheel is applied to the wire, the gravity wheel is provided with an annular wire groove, and the wire is buckled into the annular wire groove.

[0007] As a preferred technical scheme, the machine device is provided with a longitudinal chute, a protruding sliding block is arranged on one side of the chute relative to the gravity wheel, the chute and the sliding block are in "T" shape, the sliding block is slidingly assembled into the chute, and two height detection devices are arranged on one side of the chute in an up-down state.

[0008] As a preferred technical scheme, the yarn feeding module comprises a yarn feeding driving wheel, a yarn feeding pressure wheel and a first driving motor, the first driving motor is connected to the yarn feeding driving wheel and drives the yarn feeding driving wheel to perform a yarn feeding action, the yarn feeding pressure wheel is arranged side by side with the yarn feeding driving wheel, the yarn passes through the yarn feeding pressure wheel and the yarn feeding driving wheel, and the yarn is pressed by the yarn feeding pressure wheel.

[0009] As a preferred technical scheme, the yarn feeding driving wheel and the yarn feeding pressure wheel are both provided with a wire groove.

[0010] As a preferred technical scheme, the yarn collecting module comprises a yarn collecting driving wheel, a yarn collecting pressure wheel and a second driving motor, the second driving motor is connected to the yarn collecting driving wheel and drives the yarn collecting driving wheel to perform a yarn collecting action, the yarn collecting pressure wheel is arranged side by side with the yarn collecting driving wheel, the yarn passes through the yarn collecting pressure wheel and the yarn collecting driving wheel, and the yarn is pressed by the yarn collecting pressure wheel.

[0011] As a preferred technical scheme, the yarn collecting driving wheel and the yarn collecting pressure wheel are both provided with a wire groove, and the second driving motor is a constant speed motor.

[0012] As a preferred technical scheme, the distance between the yarn feeding module and the transition wheel is h, the value of the distance h is equal to the outer diameter of the gravity wheel, so that the yarn is perpendicular to the horizontal plane after supporting the gravity wheel.

[0013] As a preferred technical scheme, the height detection device adopts a photoelectric switch, a travel switch or a grating ruler.

[0014] The application discloses a cutting machine unwinding wire tension control device, which comprises an equipment machine table (1), a wire unwinding module (3) provided with a power driving mechanism and a wire winding module (2) provided with a power driving mechanism are arranged on the equipment machine table (1), a wire (7) is wound on the wire unwinding module (3), a tension test assembly (6) is further arranged on the equipment machine table (1), the wire (7) is wound on the wire winding module (2) after passing through the tension test assembly (6), a tension wheel (51) is arranged between the wire unwinding module (3) and the wire winding module (2), a gravity wheel (8) capable of moving up and down is arranged between the tension wheel (51) and the wire unwinding module (3), the wire (7) is wound on the bottom of the gravity wheel (8) after being unwound from the wire unwinding module (3) and then is connected to the wire winding module (2) through the top of the tension wheel (51), the tension generated during the conveying of the wire (7) drives the gravity wheel (8) to move up or down, height detection devices (55) are arranged in the up-and-down moving direction of the gravity wheel, the height position of the gravity wheel is detected in real time through the height detection devices (55), and the speed difference between the wire unwinding module and the wire winding module is adjusted; an adjustable resistance damper is arranged on one side of the back of the tension wheel (51).

[0015] As a preferred technical scheme, the adjustable resistance damper comprises a brake disc and a hinged rod, the hinged rod is located at the top of the brake disc, the brake disc is coaxially arranged with the tension wheel, a fixed seat is fixedly arranged on one side of the hinged rod, the hinged rod is hinged to the fixed seat through a hinge shaft, the other end of the hinged rod is a movable end, a damping block is arranged on the bottom of the hinged rod and faces the position of the brake disc, the brake disc and the tension wheel are installed on the same connecting shaft, an electromagnet is installed on the bottom of the movable end of the hinged rod, a metal block is fixedly arranged on the bottom base surface corresponding to the electromagnet, and a magnetic attraction force is generated between the electromagnet and the metal block after the electromagnet is electrified.

[0016] As a preferred technical scheme, an arc-shaped contact surface is arranged on the lower end surface of the damping block, and the arc-shaped contact surface is in frictional contact with the arc-shaped surface of the brake disc.

[0017] The application has the beneficial effects that a gravity wheel and a transition wheel are installed, the weight of the gravity wheel is used to always press the wire, when there is a speed difference between the wire unwinding module and the wire winding module, only the height of the gravity wheel is changed, the tension is not changed, the tension of the wire is more stable, and when the adjustable damper tension wheel is used in series, the tension is stable and convenient to adjust. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical schemes in the embodiments of the application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0019] Figure 1 This is a schematic diagram of the structure of the take-up module and the unwind module in the prior art;

[0020] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure in Embodiment 1 of the present invention when a tension speed difference occurs;

[0022] Figure 4 This is a top view of Embodiment 1 of the present invention;

[0023] Figure 5 This is a schematic diagram of the friction damping device according to Embodiment 2 of the present invention;

[0024] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention. Detailed Implementation

[0025] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0026] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0027] Example 1

[0028] like Figure 2 As shown, a wire unwinding tension control device for a cutting machine tool according to the present invention includes a machine base 1, on which a wire unwinding module 3 with a power drive mechanism and a wire take-up module 2 with a power drive mechanism are provided. Wire 7 is wound on the wire unwinding module 3. A tension testing component 6 is also provided on the machine base 1. The pulled-out end of the wire 7 passes through the tension testing component 6 and is then wound on the wire take-up module 2. The tension testing component is a common method in the art, and its principle will not be explained here.

[0029] The unloading module 3 conveys the yarn 7 from the yarn spool (not marked in the figure) and then sends it through the take-up module 2. A transition wheel 5 is installed between the unloading module 3 and the take-up module 2. A gravity wheel 8 with vertical movement is installed between the transition wheel 5 and the unloading module 3. After the yarn 7 is unloaded from the unloading module 3, it is wound around the bottom of the gravity wheel 8 and then enters the take-up module 2 through the top of the transition wheel 5. The tension generated when the yarn 7 is conveyed drives the gravity wheel 8 to rise or fall.

[0030] In this embodiment, the yarn passes through a U-shaped structure between the unwinding module 3, the gravity wheel 8, and the transition wheel 5. The weight of the gravity wheel 8 is applied to the yarn 7. The gravity wheel 8 has an annular groove, and the yarn 7 is inserted into the annular groove. The gravity wheel applies gravity to the yarn, and it remains suspended, thus keeping the yarn taut. Even if a tension difference occurs during unwinding and rewinding, the gravity wheel maintains constant tension, achieving automatic leveling. When a tension difference occurs, such as... Figure 3 As shown, the height of the gravity wheel on the machine platform will change, and leveling can be achieved by changing the height of the gravity wheel, which is very convenient.

[0031] To better guide the gravity wheel during both ascent and descent, a longitudinally arranged slide groove 4 is provided on the machine tool 1. A protruding slider 81 is provided on the side of the gravity wheel 8 opposite to the slide groove. The slide groove 4 and the slider 81 form a "T" shape, and the slider 81 is slidably fitted into the slide groove 4. Figure 4 As shown, since both the slider and the groove are "T" shaped, the slider and the groove cannot be separated and can only move up and down along them. The gravity wheel can also always be in a rising or falling state.

[0032] The above embodiment uses a slider and groove structure. The surface gravity wheel can be lifted up and down by using a slider and groove. Of course, other lifting structures can also be used in actual use, such as guide rollers and wheel grooves. The specific lifting structure of the gravity wheel is not limited here.

[0033] In this embodiment, the yarn feeding module 3 includes a yarn feeding drive wheel 31, a yarn feeding clamping wheel 32, and a first drive motor 33. The first drive motor 33 is connected to the yarn feeding drive wheel 31 and drives the yarn feeding drive wheel 31 to perform yarn feeding action. The yarn feeding clamping wheel 32 is arranged side by side with the yarn feeding drive wheel 31. The yarn 7 passes through the yarn feeding clamping wheel 32 and the yarn feeding drive wheel 31, and is clamped by the yarn feeding clamping wheel 32. Both the yarn feeding drive wheel 31 and the yarn feeding clamping wheel 32 are provided with yarn grooves. Since the first drive motor controls the speed of the yarn feeding drive wheel, the speed adjustment purpose is achieved.

[0034] like Figure 2 As shown, Figure 2 The distance between the middle feeding module and the transition wheel is h, and the value of this distance h is equal to the outer diameter of the gravity wheel. In this way, the yarn is perpendicular to the horizontal plane after being supported by the gravity wheel, and the angle will not change due to the change in height, thus affecting the change in tension.

[0035] In this embodiment, the transition wheel is used as a damping tension wheel because it is difficult to adjust the gravity wheel 8 in a timely manner. Using the transition wheel as a tension wheel can make the actual tension equal to the sum of the tension applied by the gravity wheel 8 and the tension applied by the damping tension wheel. The damping of the damping tension wheel can be flexibly controlled.

[0036] In this embodiment, the height detection device uses a photoelectric switch, a limit switch, or a grating ruler.

[0037] To detect the height of the gravity wheel and keep it in a controllable and relatively stable environment, two height detection devices are installed at the upper and lower ends of the chute to detect the height position of the gravity wheel in real time. When the height deviates from the set height, the relative speed of the unwinding module 3 and the winding module 2 is adjusted to bring the gravity wheel 8 back to the set height area. When a height difference of the gravity wheel is detected, in order to reduce the tension change caused by the speed change of the gravity wheel, the speed adjustment speed of the two motors is less than one percent per second.

[0038] The take-up module 2 includes a take-up drive wheel 21, a take-up clamping wheel 22, and a second drive motor 23. The second drive motor 23 is connected to the take-up drive wheel 21 and drives it to perform take-up actions. The take-up clamping wheel 22 is arranged side by side with the take-up drive wheel 21. The wire 7 passes through the take-up clamping wheel 22 and the take-up drive wheel 21, and is clamped by the take-up clamping wheel 22. Both the take-up drive wheel 21 and the take-up clamping wheel 22 are provided with wire grooves. The second drive motor 23 is a constant speed motor. Therefore, when a tension difference occurs, the tension difference can be controlled by adjusting the speed of the second drive motor. However, due to the gravity wheel, this speed adjustment process can be lengthened, reducing the requirements for speed adjustment response.

[0039] Example 2

[0040] like Figure 5 and Figure 6 As shown, the overall structure of this embodiment is the same as that of the previous embodiment, except that the transition wheel 5 is replaced with the tension wheel 51, and an adjustable resistance damper is provided on the back side of the tension wheel (51).

[0041] The adjustable resistance damper in this embodiment includes a brake disc 52 and a hinge rod 55. The hinge rod 55 is located at the top of the brake disc 52. The brake disc 52 and the tension wheel 51 are coaxially arranged. A fixed seat 53 is fixedly arranged on one side of the hinge rod 55. One end of the hinge rod 55 is hinged to the fixed seat through a hinge shaft. The other end of the hinge rod 55 is a movable end. A damping block 54 is arranged at the bottom of the hinge rod 55, directly opposite the brake disc 52. The brake disc 52 and the tension wheel 51 are mounted on the same connecting shaft. An electromagnet 56 is installed at the bottom of the movable end of the hinge rod 55. A metal block 57 is fixedly arranged on the bottom base surface of the electromagnet 56. When the electromagnet 56 is energized, a magnetic attraction force is generated between it and the metal block. The lower end surface of the damping block 54 is provided with an arc-shaped contact surface, which makes frictional contact with the arc-shaped surface of the brake disc 52. In this embodiment, the tension detected by the tension testing component is equal to the tension applied to the wire by the gravity wheel plus the tension generated by the tension wheel.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A tension control device for unwinding wire on a cutting machine tool, comprising a machine base (1), wherein the machine base (1) is provided with an unwinding module (3) with a power drive mechanism and a take-up module (2) with a power drive mechanism, wherein a wire (7) is wound on the unwinding module (3), and the machine base (1) is further provided with a tension testing component (6), wherein the pull-out end of the wire (7) passes through the tension testing component (6) and is then wound on the take-up module (2), characterized in that: A transition wheel (5) is installed between the wire feeding module (3) and the wire taking-up module (2). A gravity wheel (8) with vertical movement capability is installed between the transition wheel (5) and the wire feeding module (3). After the wire (7) is fed from the wire feeding module (3), it is wound around the bottom of the gravity wheel (8) and then enters the wire taking-up module (2) through the top of the transition wheel (5). The speed difference between the wire feeding and taking-up modules will cause the gravity wheel to rise or fall. A height detection device (55) is set in the vertical movement direction of the gravity wheel. The height position of the gravity wheel is detected in real time by the height detection device (55), and the speed difference between the wire feeding module and the wire taking-up module is adjusted. The thread (7) passes through the thread feeding module (3), gravity wheel (8) and transition wheel (5) in a "U" shape. The weight of gravity wheel (8) is applied to the thread (7). An annular groove is provided on gravity wheel (8). The thread (7) is inserted into the annular groove. The equipment platform (1) is provided with a slide groove (4) arranged in a direction perpendicular to the horizontal. A gravity wheel (8) is provided with a protruding slider (81) on one side of the slide groove. The slide groove (4) and the slider (81) are in a "T" shape. The slider (81) is slidably assembled into the slide groove (4). Two height detection devices (55) are respectively arranged on one side of the slide groove in an up-down state. The wire feeding module (3) includes a wire feeding drive wheel (31), a wire feeding clamping wheel (32), and a first drive motor (33). The first drive motor (33) is connected to the wire feeding drive wheel (31) and drives the wire feeding drive wheel (31) to perform wire feeding action. The wire feeding clamping wheel (32) is arranged side by side with the wire feeding drive wheel (31). The wire (7) passes through the wire feeding clamping wheel (32) and the wire feeding drive wheel (31), and the wire is clamped by the wire feeding clamping wheel (32). The take-up module (2) includes a take-up drive wheel (21), a take-up pressing wheel (22), and a second drive motor (23). The second drive motor (23) is connected to the take-up drive wheel (21) and drives the take-up drive wheel (21) to perform take-up action. The take-up pressing wheel (22) is arranged side by side with the take-up drive wheel (21). The wire (7) passes through the take-up pressing wheel (22) and the take-up drive wheel (21), and the take-up pressing wheel (22) presses the wire (7) tightly. Both the take-up drive wheel (21) and the take-up pressing wheel (22) are provided with wire grooves, and the second drive motor (23) is a constant speed motor; the distance between the wire feeding module and the transition wheel is h, and the value of this distance h is equal to the outer diameter of the gravity wheel, so that the wire is perpendicular to the horizontal plane after supporting the gravity wheel; Replace the transition wheel (5) with the tension wheel (51), and an adjustable resistance damper is provided on one side of the back of the tension wheel (51); The adjustable resistance damper includes a brake disc and a hinge rod. The hinge rod is located at the top of the brake disc. The brake disc and the tension wheel are coaxially arranged. A fixed seat is fixedly arranged on one side of the hinge rod. One end of the hinge rod is hinged to the fixed seat through a hinge shaft. The other end of the hinge rod is a movable end. A damping block is arranged at the bottom of the hinge rod facing the brake disc. The brake disc and the tension wheel are mounted on the same connecting shaft. An electromagnet is installed at the bottom of the movable end of the hinge rod. A metal block is fixedly arranged on the bottom base surface of the electromagnet. When the electromagnet is energized, a magnetic attraction force is generated between the electromagnet and the metal block. The lower end face of the damping block is provided with an arc-shaped contact surface, which makes frictional contact with the arc-shaped surface of the brake disc. The height detection device uses a photoelectric switch, a limit switch, or a grating ruler.

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