Accurate control constant tension structure device applied to racket threading machine

Abstract

The utility model discloses an accurate control constant tension structure device applied to a racket threading machine, which comprises a case, polish rods are symmetrically fixed on the inner wall of the case, a screw rod is rotatably connected between the two polish rods on the inner wall of the case, first sliding blocks are arranged on rod bodies of the two polish rods, and the first sliding blocks are connected with the screw rod. Second sliding blocks are installed on the portions, located on the two sides of the first sliding blocks, of the polish rod bodies, nut bases are installed on the lead screw bodies, middle driving bases are fixed to the outer sides of the nut bases and the first sliding blocks, guide bases are fixed to the outer sides of the second sliding blocks of the two polish rod bodies, and the nut bases and the first sliding blocks are fixedly connected through the middle driving bases. The four second sliding blocks are fixedly connected through a guide seat, a tension and compression spring is fixed between the front end of the middle driving seat and the guide seat, a tension clamp is fixed to the end face of the top of the guide seat, panels are fixed to the two sides of the guide seat, and inductive switches are symmetrically installed on the surface of one panel.

Description

Technical Field

[0001] The utility model belongs to the technical field of tension devices, and in particular relates to a precise control constant tension structure device applied to a racket stringing machine. Background Art

[0002] In the stringing process of a racket stringing machine, a tension device that can provide constant tension is required. In the prior art, the sensors for measuring tension are mostly angle tension sensors and gear encoders. When the angle tension sensor is in use, due to the friction between the components during the movement, the actual transmission to the angle sensor will affect the actual opening angle, which will lead to unstable control force and large range swing. The gear encoder can avoid this situation and ensure that the floating value of the tension is within a very small range. However, when measuring tension in the gear encoder device, the linkage mode of chain transmission is mainly adopted, but the chain is easy to stretch and wear, and it is easy to cause chain derailment after the chain stretches and wears. In addition, the instantaneous chain speed and the instantaneous transmission ratio are not constants, resulting in poor stability of the chain transmission, and certain impact and noise during operation. Based on this, the utility model designs a precise control constant tension structure device applied to the racket stringing machine to solve the above problems. Utility Model Content

[0003] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a precise control constant tension structure device for a racket stringing machine, comprising a chassis, wherein the inner wall of the chassis is symmetrically fixed with polished rods, the inner wall of the chassis is located between two polished rods and is rotatably connected with a screw rod, the two polished rod shafts are both equipped with a first slider, the polished rod shafts are located on both sides of the first slider and are equipped with a second slider, the screw rod shaft is equipped with a nut seat, the nut seat and the outer side of the first slider are fixed with a middle driving seat, the outer side of the second slider of the two polished rod shafts are fixed with a guide seat, and the nut seat and the first slider are fixedly connected through the middle driving seat The four second sliding blocks are fixedly connected through a guide seat, a tension and compression spring is fixed between the front end of the middle driving seat and the guide seat, a tension clamp is fixed to the top end face of the guide seat, panels are fixed on both sides of the guide seat, one of the panel surfaces has induction switches symmetrically installed, induction rods are fixed at the corresponding induction switches on both sides of the inner wall of the chassis, a rack is fixed on the surface of the other panel, an encoder bracket is provided on one side of the rack, a gear encoder is fixed on the top of the encoder bracket, the bottom of the gear encoder is fixedly connected to the middle driving seat, and the gear and rack at the output end of the gear encoder are meshed and connected.

[0004] As a preferred technical solution of the present utility model, the guide seat is an inverted U-shaped structure, and the middle driving seat is arranged on the inner side of the guide seat.

[0005] As a preferred technical solution of the utility model, there is no contact between the middle driving seat and the guide seat.

[0006] As a preferred technical solution of the utility model, a reduction motor is arranged on one side of the panel to which the induction switch is fixed, the reduction motor and the screw rod are connected by a belt drive, and the reduction motor body is fixed on the chassis.

[0007] Compared with the prior art, the beneficial effects of the utility model are:

[0008] The utility model is a device that can accurately control a constant tension structure. The compression displacement of a tension spring is converted into the movement of a rack to drive the rotation of the gear, so that the gear encoder can accurately display the displacement and then accurately display the tension value through calculation, ensuring that the floating value of the tension is within a very small range. Compared with the existing gear encoder using a chain drive, the utility model has the advantages of no noise during operation, stable operation, small wear, long service life, and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0011] Figure 2 This is a schematic diagram of the structure of one side of the utility model without the top casing of the chassis;

[0012] Figure 3 This is a schematic diagram of the structure of the other side of the utility model without the top casing of the chassis;

[0013] Figure 4 This is a schematic diagram of the structure of the driving seat and the guide seat after the panel is removed in the utility model;

[0014] In the figure: 1. Chassis; 2. Polished rod; 3. Screw rod; 4. First slider; 5. Second slider; 6. Nut seat; 7. Middle drive seat; 8. Guide seat; 9. Tension and compression springs; 10. Tension clamp; 11. Panel; 12. Induction switch; 13. Induction rod; 14. Rack; 15. Encoder bracket; 16. Gear encoder; 17. Reducer motor. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0016] See also Figure 1-4 The utility model provides the following technical solutions: a precise control constant tension structure device for a racket stringing machine, comprising a chassis 1, a polished rod 2 is symmetrically fixed on the inner wall of the chassis 1, a screw rod 3 is rotatably connected between the two polished rods 2, a first slider 4 is installed on the shafts of the two polished rods 2, a second slider 5 is installed on the shafts of the polished rods 2 located on both sides of the first slider 4, a nut seat 6 is installed on the shafts of the screw rods 3, a middle driving seat 7 is fixed on the outer side of the nut seat 6 and the first slider 4, a guide seat 8 is fixed on the outer side of the second sliders 5 of the shafts of the two polished rods 2, the nut seat 6 and the first slider 4 are fixedly connected through the middle driving seat 7, the four second sliders 5 are fixedly connected through the guide seat 8, a tension and compression spring 9 is fixed between the front end of the middle driving seat 7 and the guide seat 8, and a tension and compression spring 9 is fixed on the top end of the guide seat 8 A tension clamp 10 is fixed on the surface, panels 11 are fixed on both sides of the guide seat 8, and a sensing switch 12 is symmetrically installed on the surface of one of the panels 11. Sensing rods 13 are fixed on both sides of the inner wall of the chassis 1 corresponding to the sensing switches 12, and a rack 14 is fixed on the surface of the other panel 11. An encoder bracket 15 is arranged on one side of the rack 14, and a gear encoder 16 is fixed on the top of the encoder bracket 15. The gear at the output end of the gear encoder 16 is meshed and connected with the rack 14. The guide seat 8 is an inverted U-shaped structure, and the middle drive seat 7 is arranged on the inner side of the guide seat 8. There is no contact between the middle drive seat 7 and the guide seat 8. A reduction motor 17 is arranged on one side of the panel 11 where the sensing switch 12 is fixed. The reduction motor 17 and the rod body of the screw rod 3 are connected by belt drive, and the body of the reduction motor 17 is fixed on the chassis 1.

[0017] In summary, with the aid of the above technical solution of the utility model, the transmission is controlled by the reduction motor 17 to control the screw rod 3, during which the reverse installation of the reduction motor 17 is realized by the belt drive, and the screw rod 3 controls the tension clamp 10 to move axially along the screw rod 3 and the light rod 2 through the connection with the nut seat 6. (During the axial movement of the tension clamp 10, the nut seat 6 is displaced by the rotation of the screw rod 3, thereby driving the middle drive seat 7 to move. The middle drive seat 7 and the guide seat 8 are only connected by the tension and compression spring 9, and then the tension clamp 10 is partially moved by the guide seat 8). The compression displacement of the tension and compression spring 9 is converted into the movement of the rack 14, thereby driving the rotation of the gear at the output end of the gear encoder 16. The gear encoder 16 can accurately display the displacement and accurately display the tension value through calculation. It can ensure that the floating value of the tension is in a very small range. During this period, the gear encoder 16 realizes real-time tension detection of the wire through displacement changes.

[0018] In the standby state, the tension clamp 10 is first moved to the left side of the screw rod 3 by the program setting, waiting for the wire to be pulled. At this time, the tension clamp 10 is naturally moved backward (moved to the rightmost end) and the induction switch 12 is pressed down by the induction rod 13, so that the induction switch 12 is in the closed state.

[0019] During use, manually pass the wire from left to right through the tension clamp 10, gently drive the tension clamp 10 forward (toward the left end), at this time the left induction switch 12 contacts the left induction rod 13, and the program starts running. The reduction motor 17 rotates, and the screw rod 3 drives the tension clamp 10 to move to the right. When it moves to the tension rating set by the program, the reduction motor 17 is controlled to stabilize the tension at the rated value. After completing the threading task, you can click the button switch on the surface of the chassis 1. The button switch and the reduction motor 17 are electrically connected, so that the screw rod 3 reverses and the tension clamp 10 returns to the standby position to wait for the next operation.

[0020] A special state, namely the disconnection state. This state exists during use. At this time, the tension clamp 10 is partially moving to the right, the tension clamp 10 is pulled to the front end by the wire, and the induction switch 12 is turned on. After the wire is broken, the tension clamp 10 immediately moves backwards, turning off the induction switch 12. The system controls the reduction motor 17 to lock here immediately after receiving the command. This state is the disconnection state. After the problem is solved, you can press the button switch to resume normal use.

[0021] Finally, it should be noted that in the present utility model, unless otherwise clearly stipulated and limited, terms such as "installation", "setting", "connection", "fixation", and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0022] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A precise control constant tension structure device for a racket stringing machine, comprising a chassis (1), characterized in that: The inner wall of the chassis (1) is symmetrically fixed with polished rods (2); the inner wall of the chassis (1) is located between the two polished rods (2) and is rotatably connected with a lead screw (3); the rod bodies of the two polished rods (2) are both equipped with a first slider (4); the rod bodies of the polished rods (2) are both equipped with second sliders (5) on both sides of the first slider (4); the rod bodies of the lead screws (3) are equipped with a nut seat (6); the outer sides of the nut seat (6) and the first slider (4) are fixed with a middle drive seat (7); the outer sides of the second sliders (5) of the rod bodies of the two polished rods (2) are both fixed with a guide seat (8); the nut seat (6) and the first slider (4) are fixedly connected via the middle drive seat (7); the four second sliders (5) are fixedly connected via the guide seat (8); the front of the middle drive seat (7) is A tension and compression spring (9) is fixed between the end and the guide seat (8), a tension clamp (10) is fixed to the top end surface of the guide seat (8), panels (11) are fixed on both sides of the guide seat (8), one of the panels (11) is symmetrically mounted with induction switches (12), induction rods (13) are fixed at the positions corresponding to the induction switches (12) on both sides of the inner wall of the chassis (1), a rack (14) is fixed on the surface of the other panel (11), an encoder bracket (15) is provided on one side of the rack (14), the bottom of the encoder bracket (15) is fixedly connected to the middle drive seat (7), a gear encoder (16) is fixed on the top of the encoder bracket (15), and the gear at the output end of the gear encoder (16) is meshingly connected with the rack (14).

2. The precise control constant tension structure device for a racket stringing machine according to claim 1, characterized in that: The guide seat (8) is an inverted U-shaped structure, and the middle drive seat (7) is arranged on the inner side of the guide seat (8).

3. The precise control constant tension structure device for a racket stringing machine according to claim 2, characterized in that: The middle driving seat (7) and the guide seat (8) are not in contact with each other.

4. The precise control constant tension structure device for a racket stringing machine according to claim 1, characterized in that: A reduction motor (17) is provided on one side of the panel (11) on which the induction switch (12) is fixed. The reduction motor (17) and the rod body of the screw rod (3) are connected via a belt drive. The body of the reduction motor (17) is fixed on the chassis (1).

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