A tennis court center net self-adjusting device

Abstract

The application belongs to the technical field of tennis courts, and discloses a middle net self-adjusting device for a tennis court, which comprises a tennis net, the top of the tennis net is connected with an upper chord rope through penetration, the two ends of the upper chord rope are both connected with a stand through penetration, and the two sides of the tennis net are both fixed to the side wall of the stand through a thin rope. When the upper chord rope is relaxed due to thermal expansion and cold contraction or long-term creep, the cooperation of the structures such as disc springs, winding wheels, ratchets and pawls is achieved, the elastic force of the disc spring is greater than the tension of the upper chord rope, the disc spring is shortened and drives the winding wheel to rotate, the ratchet wheel rotates, the pawl slides on the tooth back of the ratchet wheel to allow the winding wheel to tighten the upper chord rope in one direction, the relaxed rope length is wound back to the winding wheel to make the upper chord rope tight again, the rope can only be tightened and cannot be loosened, and the tension is maintained at a level not lower than the set value of the disc spring. The application realizes automatic sensing and instant compensation of tension drift, and can make the tennis net always maintain the set tension value without manual intervention.

Description

Technical Field

[0001] This invention belongs to the field of tennis court technology, specifically a self-adjusting device for the center net of a tennis court. Background Technology

[0002] The tennis net is the central boundary structure that divides the court into two halves. A standard tennis net consists of net posts, top string, net straps, net body, and center strap. The tension of the tennis net directly affects the fairness of the game. Different tournaments and different courts have different requirements for net tension. Changes in tension directly alter the height of the center of the net, thus affecting whether a net ball can bounce over the net. Current tension adjustment methods are mostly manual cranks or ratchet mechanisms, which lack a continuous tension maintenance mechanism after adjustment.

[0003] A tension-adjustable ping-pong net frame, disclosed in prior art document CN223082204U, includes a left support and a right support facing each other. A vertical left bracket is fixed to the upper end of the left support, and a left guide wheel is located at the upper end of the left bracket. A vertical right support is fixed to the upper end of the right support, and a right wheel frame is located at the upper end of the right support, with a right guide wheel on the right wheel frame. A net is positioned between the left and right supports. A horizontally movable net rope is located at the upper end of the net. The left end of the net rope passes through the left guide wheel and is connected to a tension adjuster, while the right end of the net rope passes through the right guide wheel and is connected to the right wheel frame. A left upright post connected to the left support is located at the left end of the net, and a horizontally adjustable right upright post is located at the right end of the net. This device, through the cooperation of the left guide wheel, tension adjuster, net rope, and right upright post, ensures that the net is consistently flat, meeting national standards. While the aforementioned patent achieves manual adjustment of net tension and maintenance of flatness through the cooperation of the left roller, tension adjuster, net cord, and right post, ensuring the net meets national standards, it cannot effectively solve the problems of not being able to automatically maintain tension after adjustment and not being able to detect and locate net damage in a timely manner. In the prior art, the tension adjuster requires manual operation periodically based on the slack of the net cord. When temperature changes cause the net cord to expand and contract due to heat or long-term use causes the net to creep and loosen, the tension will continue to drift, but the adjuster cannot automatically sense and compensate for it, still requiring manual detection and intervention, resulting in a significant time lag. In addition, the prior art and other existing tennis net adjustment devices lack the function of sensing and indicating local damage to the net. Damage such as broken net cords and worn net cords can only be detected by manual visual inspection. When damage occurs in areas that are difficult to observe directly, such as the upper edge of the net or near the center band, it is often difficult to detect in time. In critical points of the match, the net damage may affect the judgment of the ball's trajectory, leading to disputes. It also increases the workload of maintenance personnel for regular comprehensive inspections. Summary of the Invention

[0004] The purpose of this invention is to provide a self-adjusting device for the center net of a tennis court with automatic tension maintenance and damage area positioning functions, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a self-adjusting net device for a tennis court, comprising a tennis net, a top string connected through the top of the tennis net, posts connected through both ends of the top string, both sides of the tennis net being fixed to the side walls of the posts by thin ropes, a one-way handle rotatably connected to the side wall of one side of the post, the one-way handle being connected to the end of the top string via a winder, and further comprising: A tension self-tightening mechanism, which is located on the other side column; A damage display mechanism, which is connected to a tension self-tightening mechanism; The tension self-tightening mechanism includes a disc spring fixed to the end of the upper string, a winding wheel abutting against the outer wall of the upper string, both sides of the winding wheel being rotatably connected to the inner cavity of the column, and a ratchet fixed at the center of the winding wheel, with a pawl engaged on the outer wall of the ratchet.

[0006] Preferably, the tension self-tightening mechanism further includes a fixed column fixed to the column insert plate, the concave surface of the pawl is elastically connected to the fixed column, the pawl is rotatably connected to the column insert plate, and an annular groove is provided at the end of the fixed column.

[0007] Preferably, a pressure post is fixedly connected to the side wall of the pawl, and a rubber rope is fixedly connected to the outer wall of the pressure post, the size of which matches the annular groove.

[0008] Preferably, a retaining plate is fixedly connected to the inner cavity of the column, the lower side of the disc spring is engaged with the middle part of the retaining plate, a locking rod is rotatably connected to the corner of the retaining plate, and the locking rod abuts against the outer wall of the disc spring. A semi-circular sleeve is fixedly connected to the top of the retaining plate, and the semi-circular sleeve is fitted onto the outside of the disc spring.

[0009] Preferably, the outer wall of the column is fitted with a cover plate by a waterproof strip, the cover plate is in the shape of an inverted L, and the cover plate is connected to the column by bolts.

[0010] Preferably, the damage display mechanism includes a protective shell fixed to the side wall of the column, and a transparent plate is fixed to the middle of the protective shell. A horizontal groove is opened in the inner cavity of the protective shell, and a baffle is slidably connected to the protective shell through the horizontal groove. A plurality of display slots are opened at equal intervals in the middle of the baffle.

[0011] Preferably, a plurality of ring rods are slidably passed through the side wall of the column, and each ring rod has a sleeve fitted on its outer wall, and the sleeve is fixed to the inner cavity of the column. Each ring rod is elastically connected to the inner cavity of the column through a pressure plate, and each ring rod is fixed to a push rod through the pressure plate.

[0012] Preferably, the column has several sliding grooves on the side near the protective shell, and multiple push rods are slidably connected to the inner wall of the sliding grooves. The ends of the push rods are all fixed with warning color plates, and the warning color plates are also slidably connected to the inner wall of the sliding grooves.

[0013] Preferably, a gear is fixedly connected to the end of the winding wheel, and an L-shaped plate is engaged with the outer wall of the gear through a rack. An inclined groove is provided on the upper side of the baffle, and a slider is fixedly connected to the end of the L-shaped plate, and the slider is slidably connected in the inclined groove.

[0014] Preferably, the column has several display openings at equal intervals on the side near the baffle, and the length of the display opening is greater than the length of the display slot.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By setting up a combination of structures such as disc spring, winding wheel, ratchet and pawl, the present invention realizes the automatic maintenance and one-way compensation of the tension of the tennis net. When the upper string becomes loose due to thermal expansion and contraction or long-term creep, the spring force of the disc spring is greater than the tension of the upper string. The disc spring shortens and drives the winding wheel to rotate. The ratchet fixed in the center of the winding wheel rotates accordingly. The pawl slides on the back of the ratchet teeth to allow the winding wheel to tighten the upper string in one direction. The loose rope length is wound back onto the winding wheel to make the upper string tight again. The pawl locks the groove of the ratchet to prevent the winding wheel from rotating in the opposite direction. The rope can only be wound tight and cannot be loosened. The tension is maintained at a level not lower than the set value of the disc spring. Compared with the existing technology that relies on manual periodic crank adjustment, the present invention realizes automatic sensing and real-time compensation of tension drift. The tennis net can always maintain the set tension value without manual intervention, eliminating the impact of tension differences under different time periods and different temperature conditions on the fairness of the game.

[0016] (2) This invention achieves the positioning and indication of the damaged area of ​​the tennis net by setting up a combination of structures such as ring buckles, push rods, warning color plates and baffles. Each ring buckle corresponds to a different longitudinal section of the tennis net and its end is always in contact with the side edge of the tennis net under the action of spring force. When a certain area of ​​the net is damaged, the reverse thrust of the ring buckle in that area decreases or disappears. The ring buckle extends forward under the action of spring force and drives the warning color plate to move through the push rod. The red area is exposed from the display slot of the baffle. The color change can be observed through the display opening on the side wall of the column. Compared with the existing technology, which relies on manual visual inspection and is difficult to find hidden damaged areas, this invention achieves direct mechanical indication of the damaged area. Maintenance personnel can quickly locate the damaged position by observing the display opening on the column, which significantly reduces the difficulty of inspection and workload. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a schematic diagram showing the structural fit between the ring-shaped rod and the thin rope of the present invention; Figure 3 This is a schematic diagram showing the structural fit between the column and the protective shell of the present invention; Figure 4 This is a schematic diagram showing the structural fit between the semi-circular sleeve and the disc spring of the present invention; Figure 5 For the present invention Figure 4 A magnified view of the structure at point A in the middle; Figure 6 This is a schematic diagram showing the structural fit between the ring rod and the sleeve of the present invention; Figure 7 This is a schematic diagram showing the structural relationship between the upper string and the winding wheel in this invention; Figure 8 This is a schematic diagram showing the structural fit between the horizontal plate and the baffle of the present invention; Figure 9 This is a schematic diagram showing the structural fit between the baffle and the display slot of the present invention; Figure 10 This is a schematic diagram showing the structural fit between the warning color plate and the slide groove of the present invention.

[0018] In the picture: 100. Tennis net; 200. Winding rope; 300. One-way handle; 400. Post; 500. Thin rope; 600. Tension self-tightening mechanism; 610. Cover plate; 620. Semi-circular sleeve; 630. Disc spring; 640. Clamping plate; 650. Locking rod; 660. Ratchet; 670. Pawl; 680. Rubber rope; 690. Pressure post; 6100. Fixing post; 6110. Winding wheel; 700. Damage display mechanism; 710. Ring rod; 720. Protective shell; 730. Transparent plate; 740. Sleeve; 750. Slide groove; 760. Push rod; 770. Warning color plate; 780. Baffle; 790. Gear; 7100. Display slot; 7110. L-shaped plate; 7120. Inclined groove; 7130. Display opening. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1 to 10As shown, the present invention provides a self-adjusting net device for a tennis court, including a tennis net 100, with an upper string 200 connected through the top of the tennis net 100, and posts 400 connected through both ends of the upper string 200. Both sides of the tennis net 100 are fixed to the side walls of the posts 400 by thin ropes 500. A one-way handle 300 is rotatably connected to the side wall of one post 400, and the one-way handle 300 is connected to the end of the upper string 200 via a winder. The device also includes: Tension self-tightening mechanism 600, which is located on the other side column 400; Damage display mechanism 700, which is connected to tension self-tightening mechanism 600; The tension self-tightening mechanism 600 includes a disc spring 630 fixed to the end of the upper string 200, a winding wheel 6110 abutting against the outer wall of the upper string 200, both sides of the winding wheel 6110 being rotatably connected to the inner cavity of the column 400, and a ratchet 660 fixed at the center of the winding wheel 6110, with a pawl 670 engaged on the outer wall of the ratchet 660.

[0021] The above scheme is adopted: the tennis net 100 serves as the main intercepting component of the entire device. A top string 200 is connected through its top to suspend the tennis net 100 and transmit tension. Both ends of the top string 200 are connected through to two side posts 400 to form tension support. Both sides of the tennis net 100 are fixed to the side walls of the posts 400 by thin ropes 500 to ensure that the side edges of the tennis net 100 are flat and fit snugly against the posts 400. A one-way handle 300 is rotatably connected to the side wall of one post 400. The one-way handle 300 is connected to the end of the top string 200 via a winder for initial tension adjustment. A tension self-tightening mechanism 600 is provided on the other post 400. The tension self-tightening mechanism 600 is connected to the damage display mechanism 700 to transmit the tension status to the damage display mechanism 700 for linkage indication. The tension self-tightening mechanism 600... The system includes a disc spring 630 fixed to the end of the upper string 200 to sense changes in the tension of the upper string 200 and generate corresponding elastic deformation. The outer wall of the upper string 200 abuts against a winding wheel 6110 for winding the slack upper string 200. Both sides of the winding wheel 6110 are rotatably connected to the inner cavity of the column 400 to achieve free rotation. A ratchet 660 is fixed at the center of the winding wheel 6110 and rotates synchronously with the winding wheel 6110. A pawl 670 is engaged on the outer wall of the ratchet 660 to limit the ratchet 660 to rotate only in one direction. Thus, when the upper string 200 becomes slack due to thermal expansion and contraction or long-term creep, the elastic force of the disc spring 630 pushes the winding wheel 6110 to rotate in one direction to tighten the upper string 200. At the same time, the engagement of the ratchet 660 and the pawl 670 prevents the winding wheel 6110 from loosening in the opposite direction, thereby achieving automatic maintenance of the tension of the upper string 200.

[0022] like Figure 2 , Figures 4 to 7 , Figure 9 As shown, the tension self-tightening mechanism 600 also includes a fixed post 6100 fixedly connected to the insert plate of the column 400. The concave surface of the pawl 670 is elastically connected to the fixed post 6100, and the pawl 670 is rotatably connected to the insert plate of the column 400. An annular groove is provided at the end of the fixed post 6100. A pressure post 690 is fixedly connected to the side wall of the pawl 670, and a rubber rope 680 is fixedly connected to the outer wall of the pressure post 690. The size of the rubber rope 680 matches the annular groove. The inner cavity of the column 400 is fixedly connected to... There is a locking plate 640, and the lower side of the disc spring 630 is locked to the middle of the locking plate 640. The corner of the locking plate 640 is rotatably connected to the locking rod 650, and the locking rod 650 abuts against the outer wall of the disc spring 630. The top of the locking plate 640 is fixedly connected to the semi-circular sleeve 620, which is sleeved on the outside of the disc spring 630. The outer wall of the column 400 is secured to the cover plate 610 by a waterproof strip. The cover plate 610 is in the shape of an inverted L, and the cover plate 610 is connected to the column 400 by bolts.

[0023] The above scheme employs a warning color plate 770, divided into red, yellow, and green, representing the status of the tennis net 100. Green indicates normal operation, yellow indicates loose tension, and red indicates net damage. The high-polymer material experiences irreversible slippage of molecular chains under continuous tensile stress, causing the rope to slowly elongate. Alternatively, the net may become damp and heavier, causing the central band to sag and increasing downward tension on the net edges, leading to slack and decreased tension. At this point, the tension of the upper string 200 on the winding wheel 6110 decreases, disrupting the force balance between the disc spring 630 and the upper string 200. The disc spring 630 begins to contract downwards, shortening and retracting the end of the upper string 200, causing the winding wheel 6110 to rotate. Finally, the ratchet 660 and pawl 670 allow the winding wheel 6110 to unidirectionally tighten the upper string 200, winding the slack rope back onto the winding wheel 6110, thus restoring the upper string 200 to tension. The spring force of disc spring 630 serves as a reference force, automatically winding back the upper string 200 by the same amount of slack until disc spring 630 returns to the set elongation, with the compensation amount precisely equal to the slack amount. This ensures that the tennis net 100 maintains the set tension value at all times, guaranteeing that the center height of the net consistently meets the standards stipulated by the International Tennis Federation, and eliminating the impact of tension differences under different time periods and temperature conditions on the fairness of the match.

[0024] like Figure 3 , Figures 6 to 10As shown, the damage display mechanism 700 includes a protective shell 720 fixed to the side wall of the column 400, and a transparent plate 730 fixed to the middle of the protective shell 720. A transverse groove is formed in the inner cavity of the protective shell 720, and a baffle 780 is slidably connected to the protective shell 720 through the transverse groove. Several display slots 7100 are equidistantly formed in the middle of the baffle 780. Several ring-shaped rods 710 slide through the side wall of the column 400. A sleeve 740 is fitted onto the outer wall of each ring-shaped rod 710, and the sleeve 740 is fixed to the inner cavity of the column 400. Each ring-shaped rod 710 is elastically connected to the inner cavity of the column 400 through a pressure plate, and each ring-shaped rod 710 is fixed to a push rod 760 through the pressure plate. The column 400 is close to the protective shell 720. A plurality of grooves 750 are provided on one side of the column 400, and multiple push rods 760 are slidably connected to the inner wall of the grooves 750. Warning color plates 770 are fixedly connected to the ends of the push rods 760, and the warning color plates 770 are also slidably connected to the inner wall of the grooves 750. A gear 790 is fixedly connected to the end of the winding wheel 6110, and an L-shaped plate 7110 is meshed with the outer wall of the gear 790 through a rack. An inclined groove 7120 is provided on the upper side of the baffle 780, and a slider is fixedly connected to the end of the L-shaped plate 7110, and the slider is slidably connected in the inclined groove 7120. A plurality of display openings 7130 are provided at equal intervals on the side of the column 400 near the baffle 780, and the length of the display openings 7130 is greater than the length of the display grooves 7100.

[0025] The above solution addresses the issue that when the tennis net 100 becomes loose, all corresponding ring rods 710 will experience uniform thrust changes. Without compensation for the position of the display slot 7100, each warning color plate 770 may simultaneously shift, leading to a misjudgment of overall aging as damage to all zones. Through the coordinated compensation of the gear 790, L-shaped plate 7110, and inclined groove 7120, the overall displacement of the baffle 780 is proportional to the compensation amount of the winding wheel 6110. This ensures that the shift of each warning color plate 770 relative to the display slot 7100 reflects only localized damage, not overall loosening, achieving precise damage positioning logic for overall compensation and localized indication. The protective shell 720 protects the internal indicating mechanism, preventing indication deviations caused by external impacts. Simultaneously, the protective shell 720 is fixed to the side wall of the column 400, forming an integral structure with the column 400, improving the device's impact resistance.

[0026] Working principle and usage process of this invention: First, a rubber rope 680 is fixed to the outer wall of the pressure post 690, which is fixed to the side wall of the pawl 670. During installation, the rubber rope 680 is first inserted into the annular groove at the end of the fixed post 6100, and the pawl 670 is separated from the ratchet 660 to facilitate the balance between the upper string 200 and the disc spring 630. The winder is driven to rotate by the one-way handle 300 on one of the uprights 400, and the upper string 200 is initially tightened to the preset tension. At this time, the rubber rope 680 is released, the pawl 670 and the ratchet 660 are engaged, and the one-way handle 300 can no longer be rotated. Then, the tennis net 100 is suspended between the two uprights 400. The two sides of the tennis net 100 are fixed to the side walls of the uprights 400 by thin ropes 500 to ensure that the net is flat, thus completing the initial installation of the center net. The end of the upper string 200 passes through the other side post 400 and is fixed to the disc spring 630. The lower side of the disc spring 630 is snapped into the middle of the clamping plate 640. The semi-circular sleeve 620 fixed to the top of the clamping plate 640 is sleeved on the outside of the disc spring 630 to provide guidance and protection. The locking rod 650 connected to the corner of the clamping plate 640 abuts against the outer wall of the disc spring 630, which facilitates the disassembly and replacement of disc springs 630 with different elasticity to adapt to the different requirements of the tension of the net in different competitions or venues. The outer wall of the top string 200 abuts against the surface of the winding wheel 6110. The two sides of the winding wheel 6110 are rotatably connected to the inner cavity of the column 400. A ratchet 660 is fixedly connected to the center of the winding wheel 6110. A pawl 670 is engaged with the outer wall of the ratchet 660. The concave surface of the pawl 670 is elastically connected to the fixed post 6100 fixed to the insert plate of the column 400, ensuring that the pawl 670 always maintains a tendency to engage with the ratchet 660. Under normal conditions, the tension of the top string 200 and the elastic force of the disc spring 630 are in balance. The disc spring 630 is stretched to an appropriate length, the winding wheel 6110 is stationary, and the tennis net 100 remains flat with tension meeting standard requirements. Meanwhile, the warning color plate 770 of the damage display mechanism 700 is located in the middle area of ​​the slide 750, and the display slot 7100 is aligned with the edge of the display opening 7130. When observed from the outside through the transparent plate 730, the color of the display slot 7100 is green, indicating that the indicator mesh is intact.

[0027] Secondly, as usage time increases or ambient temperature changes, the upper winding rope 200 loosens due to thermal expansion and contraction, long-term creep, or increased weight due to moisture absorption, resulting in decreased tension. At this time, the tension of the upper winding rope 200 on the winding wheel 6110 decreases, disrupting the force balance between the disc spring 630 and the upper winding rope 200. The elastic force of the disc spring 630 becomes greater than the tension of the upper winding rope 200, causing the disc spring 630 to shorten downwards. This process results in a perceived decrease in tension. As the disc spring 630 shortens, it moves the end of the upper winding rope 200, causing the winding wheel 6110 to rotate. When the winding wheel 6110 rotates, the ratchet 660 fixed to its center rotates accordingly. The pawl 670 slides on the back of the teeth of the ratchet 660, allowing the winding wheel 6110 to unidirectionally tighten the upper winding rope 200, winding the slack rope back onto the winding wheel 6110, thus restoring tension to the upper winding rope 200. Pawl 670 engages the teeth of ratchet 660 to prevent winding wheel 6110 from rotating in the opposite direction. The upper string 200 can only automatically tighten and cannot loosen; once the string is wound back, it will not be released again, maintaining tension at a level not lower than the set value of disc spring 630. In this way, any tension drift caused by temperature changes or long-term use is automatically compensated for without manual intervention, ensuring the tennis net 100 always maintains the set tension value. This ensures the center height of the net consistently meets standard requirements, eliminating the impact of tension differences under different time periods and temperature conditions on the fairness of the game. A cover plate 610 is attached to the outer wall of the upright 400 via a waterproof strip. The cover plate 610 is an inverted L-shape and bolted to the upright 400, providing waterproof and dustproof protection for the internal mechanism. This prevents rain and dust from intruding and causing corrosion or jamming, ensuring the long-term reliable operation of the tension self-tightening mechanism 600.

[0028] Furthermore, when the tennis net 100 experiences localized damage in a certain area due to prolonged use, the breakage of the net strings in that area will cause a change in the tension distribution around the damage point. This change is transmitted to the damage display mechanism 700 via the upper string 200. Several ring-shaped rods 710 slide through the side wall of the upright 400, and the ring-shaped rods 710 are evenly distributed along the width direction of the tennis net 100. Each ring-shaped rod 710 corresponds to a longitudinal section of the tennis net 100. A sleeve 740 is fitted onto the outer wall of the ring-shaped rod 710 and fixed to the inner cavity of the upright 400 to provide guidance. The ring-shaped rod 710 is elastically connected to the inner cavity of the upright 400 through a pressure plate, so that the end of the ring-shaped rod 710 always abuts against the side edge of the tennis net 100 under the action of spring force. Under normal conditions, each ring rod 710 extends evenly under the action of elastic force. The push rod 760, fixed by the pressure plate, is located in a fixed position within the slide groove 750. The warning color plate 770 fixed to the end of the push rod 760 is covered by the baffle 780, displaying only the normal green color. When a certain area of ​​the tennis net 100 is damaged, the reverse thrust of the net body on the ring rod 710 in that area decreases or disappears. The ring rod 710 extends forward under the action of spring force, driving the push rod 760 to slide along the slide groove 750. The warning color plate 770 at the end of the push rod 760 moves accordingly, and the red area is exposed from the display groove 7100 of the baffle 780. The color change of the warning color plate 770 can be observed through the display opening 7130 on the side wall of the column 400. Simultaneously, as the top string 200 naturally slackens, the tennis net 100 also slackens, and the winding wheel 6110 rotates due to tension compensation. At this time, the gear 790 fixed to the end of the winding wheel 6110 rotates accordingly. The gear 790 drives the L-shaped plate 7110 to move vertically through the rack. The slider fixed to the end of the L-shaped plate 7110 slides in the inclined groove 7120 on the upper side of the baffle 780, pushing the baffle 780 to slide horizontally along the transverse groove in the inner cavity of the protective shell 720. This causes the positions of each display slot 7100 on the baffle 780 to shift as a whole. Since the length of the display opening 7130 is greater than the length of the display slot 7100, the position of the display slot 7100 is simultaneously fine-tuned during the rotation of the winding wheel 6110 to compensate for the natural slackening of the net, ensuring that the display slot 7100 always shows an accurate color. The protective shell 720 provides protection for the internal indicating mechanism, preventing external impacts from causing indicating deviations.

[0029] Finally, when the tennis net 100 reaches the end of its service life or is severely damaged and needs to be replaced, loosen the one-way handle 300 on one side post 400 to release the lock of the winder on the upper string 200, and remove the old tennis net 100 along with its upper string 200. After replacing the tennis net 100 with a new one, drive the winder again via the one-way handle 300 to tighten the upper string 200 to the initial set tension. The disc spring 630 is stretched to the set position, and the winding wheel 6110 rotates in the opposite direction to release the excess rope length. The gear 790 rotates in the opposite direction with the winding wheel 6110, driving the L-shaped plate 7110 to move in the opposite direction via the rack. The baffle 780 returns to its initial position, and each ring lever 710 is pressed back to its original position by the obstruction of the tennis net 100. The warning color plate 770 is once again covered by the baffle 780, and the damage display mechanism 700 resets. The entire replacement process does not require disassembling the tension self-tightening mechanism 600 inside the upright 400; simply operating the one-way handle 300 is sufficient to remove the old net and install the new net, making the operation convenient and efficient. The tension self-tightening mechanism 600 ensures consistent tension on the top string 200, while the damage display mechanism 700 locates the damaged area, facilitating the identification of net balls that have been touched. It also allows for timely replacement of the new tennis net 100, making it suitable for applications requiring rapid assessment of the net's condition during tennis matches.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-adjusting net device for a tennis court, comprising a tennis net (100), wherein a top string (200) is connected through the top of the tennis net (100), and posts (400) are connected through both ends of the top string (200). Both sides of the tennis net (100) are fixed to the side walls of the posts (400) by thin ropes (500). A one-way handle (300) is rotatably connected to the side wall of one side of the post (400), and the one-way handle (300) is connected to the end of the top string (200) by a winder. The device is characterized in that... Also includes: A tension self-tightening mechanism (600) is located on the other side column (400); A damage display mechanism (700) is connected to a tension self-tightening mechanism (600); The tension self-tightening mechanism (600) includes a disc spring (630) fixed to the end of the upper string (200), the outer wall of the upper string (200) abuts against a winding wheel (6110), both sides of the winding wheel (6110) are rotatably connected to the inner cavity of the column (400), and a ratchet (660) is fixed at the center of the winding wheel (6110), and a pawl (670) is engaged on the outer wall of the ratchet (660).

2. The self-adjusting net device for tennis courts according to claim 1, characterized in that: The tension self-tightening mechanism (600) further includes a fixed post (6100) fixed to the insert plate of the column (400), the concave surface of the pawl (670) is elastically connected to the fixed post (6100), the pawl (670) is rotatably connected to the insert plate of the column (400), and an annular groove is provided at the end of the fixed post (6100).

3. The self-adjusting net device for tennis courts according to claim 1, characterized in that: The side wall of the pawl (670) is fixed with a pressure post (690), and the outer wall of the pressure post (690) is fixed with a rubber rope (680), the size of which matches the annular groove.

4. The self-adjusting net device for tennis courts according to claim 1, characterized in that: A retaining plate (640) is fixedly connected to the inner cavity of the column (400). The lower side of the disc spring (630) is engaged with the middle part of the retaining plate (640). A locking rod (650) is rotatably connected to the corner of the retaining plate (640), and the locking rod (650) abuts against the outer wall of the disc spring (630). A semi-circular sleeve (620) is fixedly connected to the top of the retaining plate (640), and the semi-circular sleeve (620) is sleeved on the outside of the disc spring (630).

5. The self-adjusting net device for tennis courts according to claim 1, characterized in that: The outer wall of the column (400) is fitted with a cover plate (610) by a waterproof strip. The cover plate (610) is an inverted L-shape and is bolted to the column (400).

6. The self-adjusting net device for tennis courts according to claim 1, characterized in that: The damage display mechanism (700) includes a protective shell (720) fixed to the side wall of the column (400), and a transparent plate (730) is fixed to the middle of the protective shell (720). A horizontal groove is opened in the inner cavity of the protective shell (720), and a baffle (780) is slidably connected to the protective shell (720) through the horizontal groove. A plurality of display slots (7100) are opened at equal intervals in the middle of the baffle (780).

7. The self-adjusting net device for tennis courts according to claim 6, characterized in that: The side wall of the column (400) is slidably perforated by a number of ring rods (710). Each ring rod (710) has a sleeve (740) fitted onto its outer wall and the sleeve (740) is fixed to the inner cavity of the column (400). Each ring rod (710) is elastically connected to the inner cavity of the column (400) through a pressure plate. Each ring rod (710) is fixed to a push rod (760) through a pressure plate.

8. The self-adjusting net device for tennis courts according to claim 7, characterized in that: The column (400) has several grooves (750) on the side near the protective shell (720). Multiple push rods (760) are slidably connected to the inner wall of the groove (750). The end of each push rod (760) is fixedly connected to a warning color plate (770), and the warning color plate (770) is also slidably connected to the inner wall of the groove (750).

9. The self-adjusting net device for tennis courts according to claim 6, characterized in that: The winding wheel (6110) has a gear (790) fixedly connected to its end. The outer wall of the gear (790) is meshed with an L-shaped plate (7110) through a rack. The upper side of the baffle (780) has a slanted groove (7120). The end of the L-shaped plate (7110) is fixedly connected to a slider, and the slider is slidably connected in the slanted groove (7120).

10. The self-adjusting net device for tennis courts according to claim 6, characterized in that: The column (400) has several display openings (7130) equidistantly opened on the side near the baffle (780), and the length of the display openings (7130) is greater than the length of the display slot (7100).

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