Active tension compensation device of warp knitting machine

Abstract

The utility model discloses an active tension compensation device of a warp knitting machine. 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 utility model has the advantages that the warp tension can be kept stable, and the water ripples on the fabric can be eliminated.

Description

Technical Field

[0001] This utility model belongs to the field of warp knitting machines, and in particular relates to an active tension compensation device for warp knitting machines. Background Technology

[0002] Warp knitting machines are commonly used equipment in the textile industry, mainly consisting of a warp feed mechanism, a loop forming mechanism, and a take-up mechanism. There are multiple warp feed mechanisms, each with a warp beam on which warp yarns are wound. After the warp yarns are released from the warp beam, they enter the loop forming mechanism, which then supplies them to the loop forming mechanism to weave the fabric. The fabric is then wound onto the take-up mechanism.

[0003] The structure of warp knitting machines has evolved over time. The warp feeding mechanism has progressed from a passive warp feeding method to a semi-active and semi-passive method, and then to an active warp feeding method. The active warp feeding method has evolved from purely mechanical control to electronic control, resulting in rapid innovation.

[0004] An existing mechanical passive compensation device is installed on the yarn exit side of the warp feed mechanism and the yarn inlet side of the loop forming mechanism. It includes a square tube fixed to the warp knitting machine frame, a riser plate on the top surface of the square tube, a yarn divider fixed to the square tube on the side of the riser plate near the warp feed mechanism, and a tension spring plate fixed to the square tube on the other side of the riser plate. One end of the tension spring plate extends in the direction of warp yarn movement and beyond the top surface of the square tube. After the warp yarn exits the warp feed mechanism, it passes through the top of the riser plate and the end of the tension spring plate before being fed backward.

[0005] The existing mechanical passive compensation device presses down the tension spring when the loop tension is high and returns to its original position when the loop tension is low, thus applying a certain amount of 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 have been placed on the production efficiency of warp knitting machines. In practice, it has been found that when the operating speed of the warp knitting machine is increased to 1600r / min, water ripples will appear on the fabric. These water ripples cannot be eliminated, and the fabric becomes a defective fabric. Utility Model Content

[0007] The purpose of this invention is to provide an active tension compensation device for warp knitting machines. This invention has the advantage of maintaining stable warp yarn tension and eliminating water ripples on the fabric.

[0008] The technical solution of this utility model is as follows: an active tension compensation device for a warp knitting machine, comprising 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 separating reed, a jacking 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 located on the rear side of the warp feeding mechanism of the warp knitting machine, a drive mechanism is connected to the rotating shaft, and the drive mechanism is connected to the controller.

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

[0010] In the aforementioned active tension compensation device for warp knitting machines, a bracket is provided at the top of the rotating shaft, and the yarn divider reed, the riser plate, and the spring plate are all fixed at the top of the bracket, with the yarn divider reed and the spring plate located on both sides of the riser plate.

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

[0012] In the aforementioned active tension compensation device for warp knitting machines, a U-shaped limiting rod is provided on the round rod, and a channel through which the warp yarn passes is formed between the limiting rod and the round rod. The limiting rod restricts the axial movement range of the warp yarn on the round rod.

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

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

[0015] Compared with the prior art, this utility model replaces the original fixed square tube with a rotating shaft, sets the spring plate on the rotating shaft, sets the controller drive mechanism on the rotating shaft, and sets the encoder connected to the controller on the main shaft of the warp knitting machine.

[0016] Through extensive experiments and summaries, the applicant discovered that when the operating speed of the warp knitting machine is increased to a certain level, water ripples appear on the fabric. The reason is that during the loop formation process of warp knitting, the warp tension changes regularly within the 360° rotation range of the main shaft of the warp knitting machine, and there is a state of zero tension due to excessive speed. In addition, the spring sheet itself has a natural frequency, and when moving at high speed, the wave superposition phenomenon occurs, and even resonance occurs, which is reflected on the fabric and produces water ripples.

[0017] After discovering the cause of the water ripples, the rotation angle of the warp knitting machine spindle is detected by the encoder. Combined with the change law of warp yarn loop tension, the tilt angle of the spring sheet is changed accordingly. This keeps the tension on the warp yarn stable, and the spring sheet no longer performs reciprocating deformation compensation, thus preventing the superposition of waves and preventing water ripples from appearing on the fabric.

[0018] Therefore, this invention has the advantage of maintaining stable warp tension and can eliminate water ripples on the fabric. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of Example 1 on a warp knitting machine.

[0020] Figure 2 This is a connection diagram of the controller in Example 1.

[0021] Figure 3 This is an axial schematic diagram of the rotating shaft in Example 1.

[0022] Figure 4 This is an axial schematic diagram of the rotating shaft at the bracket in Embodiment 2.

[0023] Figure 5 This is a top view of the rotating shaft in Example 2.

[0024] The labels in the attached diagram are as follows: 1-Encoder, 2-Spindle, 3-Controller, 4-Main shaft, 5-Dividing reed, 6-Rack plate, 7-Spring plate, 9-Warp feeding mechanism, 10-Servo driver, 11-Servo motor, 12-Worm, 13-Worm wheel, 14-Bracket, 15-Round rod, 16-Limit rod, 17-Warp yarn, 18-Ringing mechanism, 19-Tightening and winding mechanism, 20-Screw, 21-Passive gear, 22-Driving gear, 23-Nut. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0026] Example 1. An active tension compensation device for a warp knitting machine, installed as follows: Figure 1 The warp knitting machine shown has three active warp feeding mechanisms 9. The yarn coming out of the warp feeding mechanism 9 combines with the weft yarn in the loop forming mechanism 18 to form the fabric. The fabric is pulled and collected by the pulling and taking-up mechanism 19.

[0027] Each warp feeding mechanism 9 is equipped with a warp knitting machine active tension compensation device, which includes encoder 1 (model EB50B8-H4AA-500), shaft 2 and controller 3 (model CP1H-X40DR-A).

[0028] like Figure 2 As shown, the detection end of 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 knit the yarn in loops), the signal end of encoder 1 is connected to controller 3, and encoder 1 is fixed on the frame of the warp knitting machine.

[0029] The rotating shaft 2 is located between the warp feeding mechanism 9 and the loop forming mechanism. The rotating shaft 2 is connected to the yarn separating reed 5, the raising plate 6 and the spring plate 7. The two ends of the rotating shaft 2 are rotatably connected to the frame of the warp knitting machine. The rotating shaft 2 is connected to the drive mechanism.

[0030] The drive mechanism includes a servo driver 10 (model CIMR-AB4A0023FBA) whose signal input terminal 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. The output end of the servo motor 11 is provided with a worm gear 12, and a worm wheel 13 is connected to the worm gear 12. The worm wheel 13 is coaxially connected to the rotating shaft 2.

[0031] The top of the rotating shaft 2 is provided with a U-shaped support 14. The two side plates of the support 14 are fixed to the rotating shaft 2. The yarn reed 5, the support plate 6 and the spring plate 7 are all fixed to the top of the support 14. The yarn reed 5 and the spring plate 7 are located on both sides of the support plate 6.

[0032] The top surface of the support plate 6 is an arc surface. The support plate 6 and the spring plate 7 are perpendicular. One end of the spring plate 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 support plate 6 and the round rod 15 at the end of the spring plate 7 in sequence. The longitudinal direction of the round rod 15 is perpendicular to the moving direction of the warp yarn 17.

[0033] The difference between Embodiment 1 and the existing mechanical passive compensation device is as follows: First, a round rod-shaped rotating shaft 2 replaces the original fixed square tube, and a worm gear 13 is installed 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 plate 7 to rotate through the rotating shaft 2 and the bracket 14. Second, an encoder 1 is installed on the main shaft 4 of the warp knitting machine to detect the rotation angle of the main shaft 4.

[0034] The usage method of Example 1: Taking one of the compensation devices as an example, the device first measures the change in warp tension within a 360° rotation period of the main shaft. When the warp knitting machine is working, the rotation angle of the main shaft 4 is reflected in the encoder 1 to form a signal, which is sent to the controller 3. The controller 3, based on the current rotation angle of the main shaft 4 and the corresponding loop tension on the warp yarn at that angle, starts the servo motor 11 through the servo driver 10, causing the spring plate 7 to rotate to a suitable tilt angle (the tilt angle can be obtained through simple experiments), so that the warp tension remains stable. During the operation of the warp knitting machine, the servo motor 11 is always in a periodic forward and reverse rotation, and the spring plate 7 is in a state of oscillation back and forth within a certain angle range. Since the spring plate 7 will change its angle autonomously under the action of the controller 3, the warp tension remains stable. Ideally, the spring plate 7 always maintains a fixed amount of change, and the end will not fluctuate back and forth, and there will be no wave superposition phenomenon. In reality, the spring plate 7 will still have a slight oscillation, but it is almost negligible compared to the original amplitude.

[0035] Example 2. The differences compared to Example 1 are as follows:

[0036] First, both the top of the support plate 6 and the top of the round rod 15 are provided with U-shaped limiting rods 16. The two ends of the limiting rods 16 are fixed to the support plate 6 or the round rod 15. The inner side of the limiting rods 16 forms a square strip channel for the warp yarns to pass through, which is used to prevent the warp yarns from coming out.

[0037] Secondly, both sides of the rotating shaft 2 are provided with sliding grooves. The lower ends of the two side plates of the bracket 14 are bent inward and enter the sliding 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.

[0038] Third, a screw 20 is provided on one side of the rotating shaft 2. The screw 20 is rotatably connected to the frame of the warp knitting machine. A driven gear 21 is provided on the screw 20. A driving gear 22 connected to the driven gear is provided on the rotating shaft 2. A nut 23 connecting the bracket 14 is provided on the screw 20.

[0039] In Example 2: When the rotating shaft 2 rotates forward and backward, the driving gear 22 drives the driven gear 21 to rotate forward and backward. The driven gear 21 drives the screw 20 to rotate forward and backward, causing the nut 23 to move back and forth axially. The nut 23 drives the support plate 6 and the round rod 15 to move back and forth through the bracket 14, which prevents the warp yarn from moving in the fixed position of the support plate 6 and the round rod 15, and prevents the support plate 6 and the round rod 15 from wearing out and causing the warp yarn to jam, thereby causing tension changes and further maintaining tension stability.

[0040] In a further optimized design, 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 back-and-forth movement distance, further reducing the wear of the support plate 6 and the round rod 15.

[0041] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation.

Claims

1. An active tension compensation device for a warp knitting machine, characterized in that: It includes 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 separating reed (5), a scaffold plate (6) and a spring plate (7), the rotating shaft (2) is rotatably connected to the frame of the warp knitting machine, the rotating shaft (2) is located on the rear side of the warp feeding mechanism (9) of the warp knitting machine, the rotating shaft (2) is connected to a drive mechanism, and the drive 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 drive mechanism includes a servo driver (10) whose signal input terminal is connected to the controller (3) and a servo motor (11) connected to the servo driver (10). The output terminal of the servo motor (11) is provided with a worm (12), and a worm wheel (13) is connected to the worm (12). 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: The top of the rotating shaft (2) is provided with a bracket (14), and the yarn reed (5), the support plate (6) and the spring plate (7) are all fixed on the top of the bracket (14). The yarn reed (5) and the spring plate (7) are located on both sides of the support 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 raised plate (6) is an arc surface. The raised plate (6) and the spring plate (7) are perpendicular. One end of the spring plate (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 raised plate (6) and the round rod (15) at the end of the spring plate (7) in sequence.

5. The active tension compensation device for a warp knitting machine according to claim 4, characterized in that: The round rod (15) is provided with a U-shaped limiting rod (16), and a channel is formed between the limiting rod (16) and the round rod (15) through which the warp yarn (17) passes. The limiting rod (16) restricts 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 raised platform (6) and the top of the round rod (15) are both provided with U-shaped limiting rods (16), and the two ends of the limiting rods (16) are fixed to the raised platform (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). One side of the rotating shaft (2) is provided with a screw (20) that is rotatably connected to the frame of the warp knitting machine. A driven gear (21) is provided on the screw (20). An active gear (22) connected to the driven gear (21) is provided on the rotating shaft (2). A nut (23) connecting the bracket (14) is provided on the screw (20).

Images