Traction harrow

Abstract

The utility model provides a traction harrow which comprises a shell, a support, a cover plate, a stepping motor, a driving nut, a guide plate, harrow claws and a spring, the guide plate is provided with an upper guide groove and a lower guide groove, a protruding block is arranged in the middle of the upper guide groove, the top of the upper guide groove extends downwards to form an elastic pressing strip, and the upper guide groove is divided into a guide part and an elastic upper cavity through the elastic pressing strip and the protruding block. The driving nut is connected with the guide plate through the spring, the stepping motor drives the guide plate to move up and down through the driving nut, and in the moving process of the guide plate, the spring can provide constant traction force for the fabric and can also randomly increase the traction force of the fabric according to local weaving changes of the fabric. The elastic pressing strip can adapt to the thickness change of the fabric to carry out fabric space dynamic compensation, so that the raking claw is not rigidly pulled when pulling the yarn or the fabric any more, the yarn is prevented from being pulled broken or the fabric is prevented from being pulled damaged, continuous operation of equipment is guaranteed, and the part replacement frequency and the maintenance cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of flat knitting machine parts, specifically a pull rake. Background Technology

[0002] As a key actuator in the fabric forming process of a flat knitting machine, the dynamic performance of the pull rake directly affects the weaving quality and equipment efficiency. Existing pull rakes are mainly connected to stepper motors via rigid couplings. Although they have high positioning accuracy in pull stroke control, the entire pull rake unit lacks a flexible buffer due to the purely rigid transmission structure. When the fabric thickness changes abruptly or the yarn tension increases sharply, dynamic compensation cannot be achieved, leading to yarn breakage or fabric damage. This also causes damage to the components of the pull rake unit, which not only increases the defect rate of the fabric and affects the continuous operation of the equipment, but also increases the cost of component replacement and maintenance. Utility Model Content

[0003] In view of the defects of existing traction rakes, the technical problem to be solved by this utility model is to provide a traction rake that can not only provide a certain constant pulling force, but also randomly increase the pulling force according to the local weaving changes of the fabric, and has a suspension function to adapt to the changes in fabric thickness and perform dynamic compensation of fabric space, so as to avoid yarn breakage or fabric damage, ensure the continuous operation of the equipment, and reduce the frequency of component replacement and maintenance costs.

[0004] To achieve the above objectives, according to one aspect of this utility model, the utility model is implemented through the following technical measures: a pull rake, comprising a housing, a bracket, a cover plate, a stepper motor, a drive nut, a guide plate, and rake claws. The housing is provided with a sliding groove for the drive nut to slide. The cover plate is located on one side of the bracket and has a rake groove. The stepper motor is located at the bottom of the bracket and drives the guide plate to move up and down through the drive nut. The guide plate is movably fixed inside the bracket. The top of the guide plate is provided with rake claws, and one side of the rake claws is provided with a rake. The guide plate is provided with an upper guide groove and a lower guide groove. The upper guide groove and the lower guide groove are respectively provided with an upper guide pin and a lower guide pin, which are fixed to the bracket. The upper guide groove has a protrusion in the middle, and an elastic pressure strip extends downward from the top of the upper guide groove near the protrusion. There is a gap between the elastic pressure strip and the protrusion. The elastic pressure strip and the protrusion divide the upper guide groove into a guide portion and an elastic upper cavity.

[0005] Furthermore, the bottom side of the drive nut extends outward to form a step, and the drive nut is connected to the guide plate by a spring.

[0006] Furthermore, the guide plate is also provided with a hook, and a screw hole is provided on the side wall above the step of the drive nut. One end of the spring is connected to the hook, and the other end is fixed to the screw hole by a screw.

[0007] Furthermore, the spring is provided with an initial tension.

[0008] Furthermore, the screw shaft of the stepper motor is axially arranged upwards, and the screw shaft is threadedly connected to the drive nut.

[0009] Furthermore, the bracket is provided with pin hole I, pin hole II, and guide plate groove for the guide plate to be inserted. The upper guide pin passes through pin hole I and the guide part of the upper guide groove, and the lower guide pin passes through pin hole II and the lower guide groove, so as to movably fix the guide plate in the guide plate groove.

[0010] Furthermore, a dovetail groove is formed at one end of the bracket, and the dovetail groove runs through the entire bracket.

[0011] Compared with the prior art, the advantages of this utility model are as follows: In the process of the guide plate movement, the spring can provide a constant pulling force to the fabric, and can also randomly increase the pulling force of the fabric according to the local weaving changes. The elastic pressure strip can adapt to the thickness changes of the fabric and perform dynamic compensation of the fabric space, so that the rake claw is no longer rigidly pulling when pulling the yarn or fabric, avoiding yarn breakage or fabric damage, ensuring continuous operation of the equipment, and reducing the frequency of component replacement and maintenance costs. Attached Figure Description

[0012] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0013] Figure 1 This is a schematic diagram of the explosive structure of a pull-out rake according to the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of the guide plate described in this utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the drive nut described in this utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the bracket described in this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Bracket; 3. Stepper motor; 4. Drive nut; 5. Guide plate; 6. Rake claw; 7. Spring; 8. Upper guide pin; 9. Lower guide pin; 10. Cover plate; 11. Upper guide groove; 12. Lower guide groove; 13. Hook; 14. Protrusion; 15. Elastic pressure strip; 16. Guide part; 17. Elastic upper cavity; 18. Rake; 19. Screw hole; 20. Step; 21. Screw; 22. Screw hole; 23. Sliding groove; 24. Guide plate groove; 25. Pin hole I; 26. Pin hole II; 27. Rake groove; 28. Dovetail groove. Detailed Implementation

[0018] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0019] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "bottom", "top", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0020] Please refer to Figure 1-4This embodiment provides a pull rake, including a housing 1, a bracket 2, a stepper motor 3, a drive nut 4, a guide plate 5, rake claws 6, a spring 7, an upper guide pin 8, a lower guide pin 9, and a cover plate 10. The housing 1 has a sliding groove 23 for the drive nut 4 to slide. The bracket 2 has pin holes I 25 and II 26, and a guide plate groove 24 for the guide plate 5 to be inserted. One end of the bracket 2 has a dovetail groove 28 that runs through the entire bracket 2, ensuring that the guide plate groove 24 of the bracket 2 is aligned after assembly and that the front ends of the rake teeth 18 are flush. Consistent; Stepper motor 3 is located at the bottom of bracket 2, with the screw shaft of stepper motor 3 axially upward. A drive nut 4 is threaded onto the screw shaft and is located in sliding groove 23. The drive nut 4 has a screw hole 19 in the middle and extends outward from one side of its bottom to form a step 20. The step 20 abuts against the bottom of guide plate 5. A screw hole 22 is provided on the side wall above the step 20, and a screw 21 is screwed into the screw hole 22. Guide plate 5 is inserted into guide plate groove 24. Guide plate 5 is provided with upper guide groove 11, lower guide groove 12, and hook 13. Guide pin 8 passes through pin hole I 25 and guide portion 16 of upper guide groove 11, and lower guide pin 9 passes through pin hole II 26 and lower guide groove 12, movably fixing guide plate 5 in guide plate groove 24. A protrusion 14 is provided in the middle of upper guide groove 11. An elastic pressure strip 15 extends downward from the top of upper guide groove 11 and approaches the protrusion 14, with a gap between them. The elastic pressure strip 15 and protrusion 14 divide upper guide groove 11 into guide portion 16 and elastic upper cavity 17. Rake claw 6 is fixed to the top of guide plate 5, and a rake is provided on one side of rake claw 6. 18; One end of the spring 7 is connected to the hook 13, and the other end is fixed to the screw hole 22 by the screw 21. The spring 7 is set with an initial tension (the spring is in a stretched state when the guide plate 5 does not move downward), so that the guide plate 5 and the rake 18 have a pre-tension when the pulling begins, so that the rake 18 starts pulling immediately as soon as it enters the fabric. This not only improves the effect but also reduces the design space of the entire pulling rake and saves costs. The cover plate 10 is provided with multiple rake grooves 27 for the rake 18 to penetrate. The cover plate 10 is located on one side of the bracket 2.

[0021] This embodiment provides a pulling rake. When the drive nut 4 is at the uppermost part of the screw, the upper guide pin 8 is at the lowermost end of the upper guide groove 11. At this time, the rake 18 is inside the cover plate 10. When the stepper motor 3 is started, the screw rotates, causing the drive nut 4 to move downward. The spring 7 pulls the guide plate 5 downward, thereby driving the rake to perform pulling work. The upper guide pin 8 moves upward relative to the guide plate 5. During the movement, the upper guide pin 8 contacts the elastic pressure strip 15, and the rake 18 passes through the rake groove 27 and protrudes. When resetting, the stepper motor 3 rotates in the opposite direction, and the screw rotates, driving the drive nut 4 to move downward. Nut 4 moves upward, driving step 20 of nut 4 to abut against guide plate 5, causing guide plate 5 to move upward, and lower guide pin 9 returns to the bottom of upper guide groove 11; when the fabric thickness changes, for example, when the thickness increases, elastic pressure strip 15 deforms to the right to make way, so that rake 18 can smoothly pull fabrics of different thicknesses; when pulling is carried out by relying on the original tension (pretension) of spring 7, if the fabric is partially unwoven, rake 18 will only pull but not move down, and stepper motor 3 can stop rotating according to the programmed instructions, thereby realizing the suspension of rake 18 pulling.

[0022] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various changes and modifications can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pull-out rake, characterized in that: The system includes a housing (1), a bracket (2), a cover plate (10), a stepper motor (3), a drive nut (4), a guide plate (5), and a rake claw (6). The housing (1) has a sliding groove (23) for the drive nut (4) to slide. The cover plate (10) is located on one side of the bracket (2) and has a rake groove (27). The stepper motor (3) is located at the bottom of the bracket (2). The stepper motor (3) drives the guide plate (5) to move up and down through the drive nut (4). The guide plate (5) is movably fixed inside the bracket (2). The top of the guide plate (5) has a rake claw (6), and a rake (18) is located on one side of the rake claw (6). The guide plate (5) is provided with an upper guide groove (11) and a lower guide groove (12). The upper guide groove (11) and the lower guide groove (12) are respectively provided with an upper guide pin (8) and a lower guide pin (9). The upper guide pin (8) and the lower guide pin (9) are fixed on the bracket (2). The upper guide groove (11) is provided with a protrusion (14) in the middle. An elastic pressure strip (15) extends downward from the top of the upper guide groove (11) and is close to the protrusion (14). There is a gap between the elastic pressure strip (15) and the protrusion (14). The elastic pressure strip (15) and the protrusion (14) divide the upper guide groove (11) into a guide part (16) and an elastic upper cavity (17).

2. The pull rake according to claim 1, characterized in that: The bottom side of the drive nut (4) extends outward to form a step (20), and the drive nut (4) is connected to the guide plate (5) by a spring (7).

3. The pull rake according to claim 2, characterized in that: The guide plate (5) is also provided with a hook (13), and the side wall above the step (20) of the drive nut (4) is provided with a screw hole (22). One end of the spring (7) is connected to the hook (13), and the other end is fixed to the screw hole (22) by a screw (21).

4. The pull rake according to claim 2 or 3, characterized in that: The spring (7) has an initial tension.

5. The pull rake according to any one of claims 1-3, characterized in that: The screw shaft of the stepper motor (3) is axially arranged upwards, and the screw shaft is threadedly connected to the drive nut (4).

6. The pull rake according to claim 1, characterized in that: The bracket (2) is provided with pin hole I (25), pin hole II (26), and guide plate groove (24) for the guide plate (5) to be inserted. The upper guide pin (8) passes through the pin hole I (25) and the guide part (16) of the upper guide groove (11), and the lower guide pin (9) passes through the pin hole II (26) and the lower guide groove (12) to fix the guide plate (5) in the guide plate groove (24).

7. The pull rake according to claim 1, characterized in that: One end of the bracket (2) has a dovetail groove (28) that runs through the entire bracket (2).

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