Active tension compensation device of warp knitting machine and using method

Abstract

The invention discloses an active tension compensation device of a warp knitting machine and a use method. The active tension compensation device comprises an encoder (1), a rotating shaft (2) and a controller (3), the detection end of the encoder (1) is connected with a main shaft (4) of the warp knitting machine, and the signal end of the encoder (1) is connected with the controller (3); the rotating shaft (2) is connected with a raddle (5), an elevated plate (6) and a spring piece (7), the rotating shaft (2) is rotationally connected with a rack of the warp knitting machine, the rotating shaft (2) is connected with a driving mechanism, and the driving mechanism is connected with the controller (3); the signal input end of the servo driver (10) is connected with the controller (3), the servo motor (11) is connected with the servo driver (10), the output end of the servo motor (11) is provided with a worm (12), the worm (12) is connected with a worm gear (13), and the worm gear (13) is connected with the rotating shaft (2). The device has the advantage that the warp tension can be kept stable, and water ripples on the fabric can be eliminated.

Description

Technical Field

[0001] The invention belongs to the field of warp knitting machines, and in particular relates to an active tension compensation device for a warp knitting machine and a use method thereof. Background Art

[0002] Warp knitting machines are commonly used in the textile industry, mainly including a warp let-off mechanism, a looping mechanism and a pulling and winding mechanism. There are multiple warp let-off mechanisms, each of which has a warp beam with rolled warp yarns. After the warp yarns are detached from the warp beams, they enter the looping mechanism and are supplied to the looping mechanism to be woven into fabrics, which are then wound on the pulling and winding mechanism.

[0003] The structural development of warp knitting machines has evolved to date. The warp let-off mechanism has evolved from a passive warp let-off method to a semi-active and semi-passive method, and then to an active warp let-off method. The active warp let-off method has evolved from pure mechanical control to electronic control, with rapid innovation.

[0004] The existing mechanical negative compensation device is arranged on the outlet side of the warp let-off mechanism and the inlet side of the loop forming mechanism, and includes a square tube fixed on the frame of the warp knitting machine, a raised plate is arranged on the top surface of the square tube, a yarn dividing reed fixed to the square tube is arranged on the side of the raised plate close to the warp let-off mechanism, and a tension spring sheet fixed to the square tube is arranged on the other side of the raised plate, one end of the tension spring sheet extends to the moving direction of the warp yarn and exceeds the top surface of the square tube. After the warp yarn comes out of the warp let-off mechanism, it passes through the top of the raised plate and the end of the tension spring sheet, and then is sent out backwards.

[0005] In the existing mechanical negative compensation device, when the loop tension is large, the tension spring sheet is pressed down, and when the loop tension is small, the tension spring sheet will recover, thereby applying a certain tension to the warp yarn in a supplementary manner to ensure the warp knitting quality of the fabric.

[0006] With the development of the industry, higher requirements are placed on the production efficiency of warp knitting machines. In practice, it is found that after increasing the operating speed of the warp knitting machine to 1600r / min, water ripples will appear on the fabric. This water ripple cannot be eliminated, and the fabric becomes defective cloth. Summary of the invention

[0007] The purpose of the present invention is to provide an active tension compensation device for a warp knitting machine and a method for using the device. The present invention has the advantage of being able to maintain a stable tension of the warp yarn and eliminate water ripples on the fabric.

[0008] The technical solution of the present invention is as follows: an active tension compensation device for a warp knitting machine comprises an encoder, a rotating shaft and a controller; the detection end of the encoder is connected to the main shaft of the warp knitting machine, and the signal end of the encoder is connected to the controller; a yarn dividing reed, a heightening plate and a spring sheet are connected to the rotating shaft, the rotating shaft is rotatably connected to the frame of the warp knitting machine, the rotating shaft is arranged on the rear side of the warp feeding mechanism of the warp knitting machine, the rotating shaft is connected to a driving mechanism, and the driving mechanism is connected to the controller.

[0009] In the aforementioned active tension compensation device for the warp knitting machine, the driving mechanism includes a servo driver whose signal input end is connected to a controller and a servo motor connected to the servo driver. A worm is provided at the output end of the servo motor, a worm wheel is connected to the worm, and the worm wheel is connected to a rotating shaft.

[0010] In the aforementioned active tension compensation device for the warp knitting machine, a bracket is provided on the top of the rotating shaft, the yarn splitting reed, the elevated plate and the spring sheet are all fixed on the top of the bracket, and the yarn splitting reed and the spring sheet are respectively located on both sides of the elevated plate.

[0011] In the aforementioned active tension compensation device for the warp knitting machine, the top surface of the elevated plate is an arc surface, the elevated plate and the spring sheet are perpendicular, one end of the spring sheet extends out of the bracket and is provided with a round rod, and the warp yarn passes through the top surface of the elevated plate and the round rod at the end of the spring sheet in sequence.

[0012] In the aforementioned active tension compensation device for the warp knitting machine, a U-shaped limit rod is provided on the round rod, a channel for the warp yarn to pass through is formed between the limit rod and the round rod, and the limit rod limits the axial movement range of the warp yarn on the round rod.

[0013] In the aforementioned active tension compensation device for the warp knitting machine, the top of the elevated plate and the top of the round rod are both provided with U-shaped limit rods, and both ends of the limit rods are fixed to the elevated plate or the round rod.

[0014] In the aforementioned active tension compensation device of the warp knitting machine, the rotating shaft is slidably connected to the bracket, a screw rod is provided on one side of the rotating shaft and is rotatably connected to the frame of the warp knitting machine, a passive gear is provided on the screw rod, an active gear connected to the passive gear is provided on the rotating shaft, and a nut connected to the bracket is provided on the screw rod.

[0015] The method of using the active tension compensation device of the warp knitting machine mentioned above obtains the variation law of the warp yarn loop tension according to the rotation speed of the main shaft of the warp knitting machine, and changes the inclination angle of the spring sheet according to the variation cycle law of the loop force and the rotation angle of the main shaft of the warp knitting machine, so that the warp yarn on the spring sheet maintains a stable tension.

[0016] Compared with the prior art, the present invention replaces the originally fixed square tube with a rotating shaft, sets the spring sheet on the rotating shaft, sets a driving mechanism connected to the controller on the rotating shaft, and then sets an encoder connected to the controller on the main shaft of the warp knitting machine.

[0017] After a large number of experiments and summaries, the applicant found that when the operating speed of the warp knitting machine is increased to a certain level, water ripples will appear on the fabric. The reason is that during the loop formation process of warp knitting, the warp tension changes regularly within the period of 360° rotation of the main shaft of the warp knitting machine, and there is a state of overspeed and zero tension. In addition, the spring sheet itself has an inherent frequency, and when it moves at high speed, a wave superposition phenomenon will occur, and even resonance will occur, which will be reflected on the fabric and produce water ripples on the fabric.

[0018] After discovering the cause of water ripples, we first use an encoder to detect the rotation angle of the main shaft of the warp knitting machine, and then change the inclination angle of the spring leaf accordingly based on the change law of the warp yarn loop tension. This can keep the tension on the warp yarn stable, and the spring leaf will no longer make reciprocating deformation compensation, and the wave superposition phenomenon will not occur, so that water ripples will not be generated on the fabric.

[0019] Therefore, the present invention has the advantage of being able to maintain stable warp tension and eliminate water ripples on the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of Example 1 on a warp knitting machine.

[0021] Figure 2 It is a connection diagram of the controller in Example 1.

[0022] Figure 3 It is an axial schematic diagram of the rotating shaft in Example 1.

[0023] Figure 4 It is an axial schematic diagram of the rotating shaft at the bracket in Example 2.

[0024] Figure 5 It is a top view schematic diagram of the rotating shaft in Example 2.

[0025] The marks in the accompanying drawings are: 1-encoder, 2-rotating shaft, 3-controller, 4-spindle, 5-yarn reed, 6-elevation plate, 7-spring sheet, 9-warp feeding mechanism, 10-servo drive, 11-servo motor, 12-worm, 13-worm wheel, 14-bracket, 15-round rod, 16-limit rod, 17-warp yarn, 18-loop forming mechanism, 19-pulling and winding mechanism, 20-screw, 21-passive gear, 22-driving gear, 23-nut. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0027] Embodiment 1. An active tension compensation device for a warp knitting machine is arranged in Figure 1 The warp knitting machine shown has three warp feeding mechanisms 9 with active warp feeding modes. The yarn coming out of the warp feeding mechanism 9 is combined with the weft yarn in the loop forming mechanism 18 to form a fabric, and the fabric is pulled and collected by the pulling and winding mechanism 19.

[0028] Each warp feeding mechanism 9 is correspondingly provided with an active tension compensation device of the warp knitting machine, and the compensation device comprises an encoder 1 (model EB50B8-H4AA-500), a rotating shaft 2 and a controller 3 (model CP1H-X40DR-A).

[0029] like Figure 2 As shown, the detection end of the encoder 1 is connected to the main shaft 4 of the warp knitting machine (i.e., the main shaft that drives the loop forming mechanism 18 to weave the yarn into loops), the signal end of the encoder 1 is connected to the controller 3, and the encoder 1 is fixed on the frame of the warp knitting machine.

[0030] The rotating shaft 2 is arranged between the warp feeding mechanism 9 and the loop forming mechanism. The rotating shaft 2 is connected with a yarn dividing reed 5, a raising plate 6 and a spring sheet 7. Both ends of the rotating shaft 2 are rotatably connected to the frame of the warp knitting machine. The rotating shaft 2 is connected with a driving mechanism.

[0031] The driving mechanism includes a servo driver 10 (model CIMR-AB4A0023FBA) whose signal input end is connected to the controller 3 and a servo motor 11 (model SMH180D-0440-30AAK-4HKC) connected to the servo driver 10. The servo motor 11 is fixed to the frame of the warp knitting machine. A worm 12 is provided at the output end of the servo motor 11. A worm wheel 13 is connected to the worm 12. The worm wheel 13 is coaxially connected to the rotating shaft 2.

[0032] A bracket 14 with a U-shaped cross-section is provided on the top of the rotating shaft 2, and the side panels of the bracket 14 are fixed to the rotating shaft 2. The yarn reed 5, the elevated plate 6 and the spring sheet 7 are all fixed on the top of the bracket 14, and the yarn reed 5 and the spring sheet 7 are respectively located on both sides of the elevated plate 6.

[0033] The top surface of the elevated plate 6 is an arc surface, the elevated plate 6 and the spring sheet 7 are perpendicular, one end of the spring sheet 7 extends out of the bracket 14 and is provided with a round rod 15, the warp yarn 17 passes through the top surface of the elevated plate 6 and the round rod 15 at the end of the spring sheet 7 in sequence, and the long direction of the round rod 15 is perpendicular to the moving direction of the warp yarn 17.

[0034] The difference between the embodiment 1 and the existing mechanical passive compensation device is that: first, a round rod-shaped rotating shaft 2 is used to replace the originally fixed square tube, and a worm gear 13 is arranged on the rotating shaft, the servo motor 11 is connected to the worm gear 13 through the worm 12, the servo motor 11 can drive the worm gear 13 to rotate through the worm 12, and the worm gear 13 drives the spring sheet 7 to rotate through the rotating shaft 2 and the bracket 14. Second, an encoder 1 is arranged on the main shaft 4 of the warp knitting machine, and the rotation angle of the main shaft 4 is detected by the encoder 1.

[0035] Method of use of Example 1: Taking one of the compensation devices as an example, the device is first used to measure the law of warp tension change within the period of 360° rotation of the main shaft. When the warp knitting machine is working, the rotation angle of the main shaft 4 is reflected on the encoder 1 to form a signal, which is transmitted to the controller 3. The controller 3 starts the servo motor 11 through the servo driver 10 according to the current rotation angle of the main shaft 4 and the size of the loop tension on the corresponding warp yarn under the rotation angle, so that the spring sheet 7 rotates to a suitable tilt angle (the tilt angle can be obtained based on a simple experiment) to keep the tension of the warp yarn stable. During the operation of the warp knitting machine, the servo motor 11 is always in a state of periodic forward and reverse rotation, and the spring sheet 7 is in a state of swinging back and forth within a certain angle range. Since the spring sheet 7 will change its angle autonomously under the action of the controller 3, the warp tension remains stable. In an ideal state, the spring sheet 7 always maintains a fixed change amount, the end will not fluctuate back and forth, and there will be no wave superposition phenomenon. In fact, the spring sheet 7 will still have a slight swing, but it is almost negligible compared to the original amplitude.

[0036] Embodiment 2. Compared with Embodiment 1, the differences are as follows:

[0037] First, a U-shaped limiting rod 16 is provided at the top of the elevated plate 6 and the top of the round rod 15. Both ends of the limiting rod 16 are fixed to the elevated plate 6 or the round rod 15. The inner side of the limiting rod 16 forms a square channel for the warp yarn to pass through, which is used to prevent the warp yarn from falling out.

[0038] Second, slide grooves are provided on both sides of the rotating shaft 2 , and the lower ends of the two side plates of the bracket 14 are bent inwardly and enter the slide grooves, so that the bracket 14 is slidably connected to the rotating shaft 2 , and the bracket 14 can slide along the axial direction of the rotating shaft 2 .

[0039] Third, a screw rod 20 is provided on one side of the rotating shaft 2, and the screw rod 20 is rotatably connected to the frame of the warp knitting machine. A passive gear 21 is provided on the screw rod 20, and a driving gear 22 connected to the passive gear is provided on the rotating shaft 2. A nut 23 connected to the bracket 14 is provided on the screw rod 20.

[0040] In Example 2: When the rotating shaft 2 rotates forward and reversely, the active gear 22 drives the passive gear 21 forward and reversely, and the passive gear 21 drives the screw 20 forward and reversely, so that the nut 23 moves axially back and forth, and the nut 23 drives the elevated plate 6 and the round rod 15 to move back and forth through the bracket 14, so as to prevent the warp yarn from always moving in the fixed position of the elevated plate 6 and the round rod 15, and to prevent the elevated plate 6 and the round rod 15 from being worn and causing the warp yarn to be stuck, thereby causing tension changes, and further maintaining tension stability.

[0041] In a further preferred embodiment, the diameter of the driving gear 22 is more than 1.5 times the diameter of the driven gear 21 , and the pitch of the nut 23 is more than 2 mm, so that the nut 23 has a larger reciprocating distance, further reducing the wear of the elevated plate 6 and the round rod 15 .

[0042] In the description of the embodiments, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation.

Claims

1. Active tension compensation device for warp knitting machine, characterized in that: The invention comprises an encoder (1), a rotating shaft (2) and a controller (3); the detection end of the encoder (1) is connected to the main shaft (4) of the warp knitting machine, and the signal end of the encoder (1) is connected to the controller (3); the rotating shaft (2) is connected to a yarn dividing reed (5), a heightening plate (6) and a spring sheet (7); the rotating shaft (2) is rotatably connected to the frame of the warp knitting machine, the rotating shaft (2) is arranged on the rear side of a warp feeding mechanism (9) of the warp knitting machine, the rotating shaft (2) is connected to a driving mechanism, and the driving mechanism is connected to the controller (3).

2. The active tension compensation device for a warp knitting machine according to claim 1, characterized in that: The driving mechanism comprises a servo driver (10) whose signal input end is connected to a controller (3) and a servo motor (11) connected to the servo driver (10); a worm (12) is provided at the output end of the servo motor (11); a worm wheel (13) is connected to the worm wheel (12); and the worm wheel (13) is connected to the rotating shaft (2).

3. The active tension compensation device for a warp knitting machine according to claim 1, characterized in that: A bracket (14) is provided on the top of the rotating shaft (2); the yarn splitting reed (5), the elevated plate (6) and the spring sheet (7) are all fixed on the top of the bracket (14); and the yarn splitting reed (5) and the spring sheet (7) are respectively located on both sides of the elevated plate (6).

4. The active tension compensation device for a warp knitting machine according to claim 3, characterized in that: The top surface of the elevated plate (6) is an arc surface. The elevated plate (6) and the spring sheet (7) are perpendicular. One end of the spring sheet (7) extends out of the bracket (14) and is provided with a round rod (15). The warp yarn (17) passes through the top surface of the elevated plate (6) and the round rod (15) at the end of the spring sheet (7) in sequence.

5. The active tension compensation device for a warp knitting machine according to claim 4, characterized in that: A U-shaped limiting rod (16) is provided on the round rod (15), and a passage for the warp yarn (17) to pass through is formed between the limiting rod (16) and the round rod (15). The limiting rod (16) limits the axial movement range of the warp yarn (17) on the round rod (15).

6. The active tension compensation device for a warp knitting machine according to claim 4, characterized in that: The top of the elevated plate (6) and the top of the round rod (15) are both provided with a U-shaped limiting rod (16), and both ends of the limiting rod (16) are fixed to the elevated plate (6) or the round rod (15).

7. The active tension compensation device for a warp knitting machine according to claim 6, characterized in that: The rotating shaft (2) is slidably connected to the bracket (14); a screw rod (20) rotatably connected to the frame of the warp knitting machine is provided on one side of the rotating shaft (2); a passive gear (21) is provided on the screw rod (20); a driving gear (22) connected to the passive gear (21) is provided on the rotating shaft (2); and a nut (23) connected to the bracket (14) is provided on the screw rod (20).

8. The method for using the active tension compensation device for a warp knitting machine according to any one of claims 1 to 7, characterized in that: According to the rotation speed of the warp knitting machine main shaft (4), the variation law of the warp yarn looping tension is obtained, and according to the variation cycle law of the looping force and the rotation angle of the warp knitting machine main shaft (4), the inclination angle of the spring sheet (7) is changed so that the warp yarn on the spring sheet (7) maintains a stable tension.

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