Tennis post

Abstract

The application discloses a tennis pole, which comprises a hollow stand column for inserting a pre-embedded part, an adjusting flange is sleeved on the lower part of the hollow stand column, the adjusting flange is locked and fixed on the hollow stand column through a locking assembly, the adjusting flange is pressed downward on the pre-embedded part after the hollow stand column is inserted into the pre-embedded part, so as to control the depth of the hollow stand column inserted into the pre-embedded part, the top of the hollow stand column is open, an end cover is arranged on the open top end of the hollow stand column, a wire passing wheel is supported in the end cover, a wire passing hole is arranged on the side wall of the end cover, a worm wheel winding wheel and a worm are rotatably installed in the upper cavity of the hollow stand column, a winding hook is fixed on the worm wheel winding wheel, the worm is engaged with the worm wheel winding wheel, a driving part for cooperating with a rocking handle to rotate the worm is installed on one end of the worm, and a plurality of net hooks for cooperating with the installation of side edges of a tennis net are installed on the outer wall of the hollow stand column. The application has the advantages of convenient use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sports equipment, in particular to a tennis pole. BACKGROUND

[0002] The tennis pole is composed of two tennis poles fixedly inserted into the pre-buried parts on both sides of the playing field and a net connected between the two tennis poles. The current tennis pole has the following disadvantages: (1) the height of the tennis pole is fixed and cannot be adjusted, which is inconvenient to use; (2) once the worm gear and the worm on the tennis pole are damaged, the whole tennis pole must be replaced, which increases the use cost. SUMMARY

[0003] The present application aims to provide a tennis pole which is convenient to use and easy to maintain.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a tennis pole, comprising a hollow column for insertion into a pre-buried part, a regulating flange is slidably sleeved on the lower part of the hollow column, the regulating flange is locked and fixed on the hollow column through a locking assembly, the regulating flange will be pressed downward on the pre-buried part after the hollow column is inserted into the pre-buried part, so as to control the depth of the hollow column inserted into the pre-buried part, the top of the hollow column is open, an end cover is provided on the open top end of the hollow column, a wire passing wheel is supported in the end cover, a wire passing hole is provided on the side wall of the end cover, a worm gear winding wheel and a worm are rotatably installed in the upper cavity of the hollow column, a winding hook is fixed on the worm gear winding wheel, the worm is engaged with the worm gear winding wheel, one end of the worm is provided with a driving part for cooperating with a shaking handle to rotate the worm, a plurality of net hooks for cooperating with the installation of the side edges of the net are sequentially and spacedly installed on the outer wall of the hollow column from top to bottom.

[0005] Further, the aforementioned tennis pole, wherein: the specific mounting structure of the worm gear winding wheel comprises: a positioning sleeve one, a positioning sleeve two, an elastic cylindrical pin one, and a rotating shaft one, the positioning hole one and the positioning hole two, which pass through the inner cavity of the hollow stand, are coaxially arranged on the left and right two opposite side walls of the upper part of the hollow stand respectively, the positioning sleeve one, the worm gear winding wheel, and the positioning sleeve two are sequentially arranged between the left and right two opposite side walls of the upper part of the hollow stand from left to right, the left end of the positioning sleeve one is externally reduced in diameter to form a positioning end one which is inserted into the positioning hole one and forms a stepped surface one which can adhere to the inner wall of the left side wall of the upper part of the hollow stand when the positioning end one of the positioning sleeve one is inserted into the positioning hole one, and a radial through hole one is arranged in the positioning sleeve one and is inserted into the elastic cylindrical pin one; the right end of the positioning sleeve two is externally reduced in diameter to form a positioning end two which is inserted into the positioning hole two and forms a stepped surface two which can adhere to the inner wall of the right side wall of the upper part of the hollow stand when the positioning end two of the positioning sleeve two is inserted into the positioning hole two; an axial through hole one is arranged in the worm gear winding wheel and passes through the worm gear winding wheel; a radial through hole two is arranged in the left end of the rotating shaft one and is inserted into the elastic cylindrical pin one; the positioning end one of the positioning sleeve one is inserted into the positioning hole one of the left side wall of the upper part of the hollow stand and the stepped surface one adheres to the inner wall of the left side wall of the upper part of the hollow stand, the positioning end two of the positioning sleeve two is inserted into the positioning hole two of the right side wall of the upper part of the hollow stand and the stepped surface two adheres to the inner wall of the right side wall of the upper part of the hollow stand, the rotating shaft one sequentially passes through the center hole of the positioning sleeve one, the axial through hole one of the worm gear winding wheel, and the center hole of the positioning sleeve two, and at this time the radial through hole two of the rotating shaft one corresponds to the radial through hole one of the positioning sleeve one, the elastic cylindrical pin one is arranged in the corresponding radial through hole one and the radial through hole two to connect the positioning sleeve one and the rotating shaft one, so that the worm gear winding wheel is rotatably mounted in the inner cavity of the hollow stand.

[0006] Further, the aforementioned tennis pole, wherein: the specific mounting structure of the worm includes: a positioning sleeve three, a positioning sleeve four, an elastic cylindrical pin two and a fixing ring, a positioning hole three is arranged on the front side wall of the upper part of the hollow stand, which penetrates into the inner cavity of the hollow stand and has a hole diameter larger than the caliber of the worm, a positioning hole four is arranged on the rear side wall of the upper part of the hollow stand, which penetrates into the inner cavity of the hollow stand and has a hole diameter smaller than the caliber of the worm, the positioning sleeve three, the worm and the positioning sleeve four are sequentially arranged between the front and rear two opposite side walls of the upper part of the hollow stand from front to back, the front end of the positioning sleeve three is externally tapered to form a positioning end three which is inserted into the positioning hole three and forms a stepped surface three which can adhere to the inner wall of the front side wall of the upper part of the hollow stand when the positioning end three of the positioning sleeve three is inserted into the positioning hole three, the center hole of the positioning sleeve three has a hole diameter larger than the caliber of the worm so that the worm can be inserted into the inner cavity of the hollow stand through the center hole of the positioning sleeve three, the rear end of the positioning sleeve four is externally tapered to form a positioning end four which is inserted into the positioning hole four and forms a stepped surface four which can adhere to the inner wall of the rear side wall of the upper part of the hollow stand when the positioning end four of the positioning sleeve four is inserted into the positioning hole four; the rear end of the worm is tapered to form a small-caliber insertion end which can be inserted into the center hole of the positioning sleeve four, and a driving part for cooperating with the swing handle to rotate the worm is arranged at the front end of the worm, the fixing ring is sleeved on the front end of the worm and has an outer diameter larger than the hole diameter of the center hole of the positioning sleeve three, a radial through hole three is arranged in the fixing ring for the elastic cylindrical pin two to be inserted, a radial through hole four is arranged at the front end of the worm for the elastic cylindrical pin two to be inserted, the positioning end three of the positioning sleeve three is inserted into the positioning hole three of the front side wall of the upper part of the hollow stand and the stepped surface three adheres to the inner wall of the front side wall of the upper part of the hollow stand, the positioning end four of the positioning sleeve four is inserted into the positioning hole four of the rear side wall of the upper part of the hollow stand and the stepped surface four adheres to the inner wall of the rear side wall of the upper part of the hollow stand, the worm is inserted into the inner cavity of the hollow stand through the center hole of the positioning sleeve three and passes through the fixing ring until the small-caliber insertion end of the worm is inserted into the center hole of the positioning sleeve four, the fixing ring tightly adheres to the rear end surface of the positioning sleeve three and the radial through hole three of the fixing ring corresponds to the radial through hole four at the front end of the worm at this time, the elastic cylindrical pin two is inserted into the corresponding radial through hole three and radial through hole four to connect the fixing ring and the worm, so that the worm is rotatably mounted in the inner cavity of the hollow stand.

[0007] Further, the aforementioned tennis pole, wherein: the driving part of the worm is a groove matched with an internal hexagonal swing handle or a protrusion matched with an external hexagonal swing handle.

[0008] Further, the aforementioned tennis pole, wherein: the bottom surface of the end cover is provided with four positioning columns distributed at the four corners of the bottom surface, and the end cover is inserted into the open top end of the hollow stand through the four positioning columns.

[0009] Furthermore, in the aforementioned tennis post, the specific installation structure of the net hook includes: a vertical groove is provided on the outer wall of the hollow post; limiting stops extending inward into the vertical groove are provided on both sides of the groove opening; a gap is left between the limiting stops on both sides; the vertical groove and the limiting stops on both sides together form a limiting vertical groove; a net hook slide is slidably provided in the limiting vertical groove; the net hook is fixed on the net hook slide; the net hook moves up and down along the limiting vertical groove via the net hook slide; locking screw holes are provided at the upper and lower ends of the net hook slide; a self-tapping screw is threaded into each locking screw hole; the self-tapping screw is screwed inward to press against the bottom wall of the limiting vertical groove, thereby installing the net hook on the hollow post.

[0010] Furthermore, in the aforementioned tennis post, the locking assembly includes a plurality of threaded locking holes extending laterally to the flange opening on the outer wall of the adjusting flange, and a tightening bolt threaded into each threaded locking hole. The tightening bolts are screwed inward to press against the outer wall of the hollow post, thereby locking and fixing the adjusting flange onto the hollow post.

[0011] Through the implementation of the above technical solutions, the beneficial effects of the present invention are: (1) The tennis post can control the depth of the tennis post inserted into the pre-embedded part by adjusting the position of the adjusting flange on the tennis post, thereby controlling and adjusting the height of the tennis post, which is convenient to use; (2) The worm gear winding wheel and worm of the tennis post are easy to disassemble and assemble. When any part of the worm gear winding wheel and worm is damaged, only the individual part needs to be replaced, without replacing the entire tennis post, which reduces the cost of use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a tennis post according to the present invention.

[0013] Figure 2 for Figure 1 An enlarged schematic diagram of part A shown in the image.

[0014] Figure 3 This is a schematic diagram of the mounting structure of the worm gear winding wheel.

[0015] Figure 4 for Figure 3 An exploded view showing the hollow pillars hidden in the middle.

[0016] Figure 5 for Figure 3 The diagram shows the structure of the hollow column.

[0017] Figure 6 for Figure 1 An enlarged schematic diagram of part B shown in the figure.

[0018] Figure 7 for Figure 1 A schematic diagram of the structure viewed from the left.

[0019] Figure 8 for Figure 7 An enlarged schematic diagram of part C shown in the figure.

[0020] Figure 9 This is a schematic diagram of the worm gear mounting structure.

[0021] Figure 10 for Figure 9 An exploded view showing the hollow pillars hidden in the middle.

[0022] Figure 11 for Figure 9 The diagram shows the structure of the hollow column.

[0023] Figure 12 This is a schematic diagram of the regulating flange.

[0024] Figure 13 for Figure 12 A cross-sectional schematic diagram.

[0025] Figure 14 This is a structural schematic diagram of the end cap from one perspective.

[0026] Figure 15 This is a structural schematic diagram of the end cap from another perspective.

[0027] Figure 16 This is a schematic diagram of the installation structure of the mesh hook. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16As shown, a tennis post includes a hollow post 2 for inserting into a pre-embedded part 1. An adjusting flange 3 is slidably sleeved on the lower part of the hollow post 2. The adjusting flange 3 is locked and fixed to the hollow post 2 by a locking assembly. After the hollow post 2 is inserted downward into the pre-embedded part 1, the adjusting flange 3 will press downward against the pre-embedded part 1 to control the depth of insertion of the hollow post 2 into the pre-embedded part 1, thereby controlling and adjusting the height of the hollow post 2. In this embodiment, the locking assembly includes: a plurality of threaded locking holes extending laterally to the flange opening 31 are provided on the outer wall of the adjusting flange 3 around the flange opening 31 of the adjusting flange 3. A tightening bolt 32 is threadedly connected to each threaded locking hole. Tighten each of the tightening bolts 32 internally so that the tightening bolts 32 push inward against the outer wall of the hollow column 2, thereby locking and fixing the adjusting flange 3 onto the hollow column 2. The above-mentioned locking assembly has a simple structure and is easy to install, allowing for convenient adjustment of the position of the adjusting flange 3 on the hollow column 2. The top of the hollow column 2 is open, and an end cap 4 is provided at the top of the open end cap 2. In this embodiment, four positioning pins 13 are provided on the bottom surface of the end cap 4, distributed at the four corners of the bottom surface. The end cap 4 is inserted into the top of the open end cap 2 through the four positioning pins 13. A wire guide wheel 5 is supported inside the end cap 4, and a wire guide hole 6 is provided on the side wall of the end cap 4, which can rotate in the upper inner cavity 211 of the hollow column 2. A worm gear winding wheel 7 and a worm 8 are mounted on the worm gear winding wheel 7. A winding hook 9 is fixed on the worm gear winding wheel 7. The worm 8 meshes with the worm gear winding wheel 7. One end of the worm 8 is equipped with a drive part 81 for cooperating with a crank handle 10 to rotate the worm 8. In this embodiment, the drive part 81 of the worm 8 is a groove that cooperates with an internal hexagonal crank handle or a protrusion that cooperates with an external hexagonal crank handle. A plurality of net hooks 11 for cooperating with the installation of the side of the net are installed sequentially from top to bottom on the outer wall of the hollow column 2. In this embodiment, the specific installation structure of the net hooks includes: a vertical long groove 14 is provided on the outer wall of the hollow column, and a hook 9 is provided on both sides of the opening of the vertical long groove 14. A limiting stop 15 is provided that extends inward into a vertical groove. A gap 16 is left between the limiting stops 15 on both sides. The vertical groove 14 and the limiting stops 15 on both sides together form a limiting vertical groove. A mesh hook slide 17 is slidably arranged in the limiting vertical groove. The mesh hook 11 is fixed on the mesh hook slide 17. The mesh hook 11 moves up and down along the limiting vertical groove through the mesh hook slide 17. Locking screw holes are provided at the upper and lower ends of the mesh hook slide 17. A self-tapping screw 12 is threaded into each locking screw hole. Tightening the self-tapping screw 12 inward makes the self-tapping screw 12 press against the bottom wall of the limiting vertical groove, thereby installing the mesh hook 1 on the hollow column 2. This allows for easy adjustment of the position of the mesh hook 11.

[0030] In this embodiment, the specific installation structure of the worm gear winding wheel 7 includes: a positioning sleeve 71, a positioning sleeve 72, an elastic cylindrical pin 73, and a rotating shaft 74. A positioning hole 75 penetrating into the inner cavity 211 of the hollow column is provided on the left side wall 212 of the upper part of the hollow column 2, and a positioning hole 76 penetrating into the inner cavity 211 of the hollow column is provided on the right side wall 213 of the upper part of the hollow column 2. The positioning hole 75 and the positioning hole 76 are coaxially arranged. The positioning sleeve 71, the worm gear winding wheel 7, and the positioning sleeve 72 are arranged from left to right between the left side wall 212 and the right side wall 213 of the upper part of the hollow column 2. The outer diameter of the left end of the positioning sleeve 71 is adjusted for insertion. The positioning end 711 of the positioning sleeve 71 is inserted into the positioning hole 75, and the diameter change at this point forms a stepped surface 712 that can abut against the inner wall of the upper left side wall 212 of the hollow column 2 when the positioning end 711 of the positioning sleeve 71 is inserted into the positioning hole 75. A radial through hole 713 is provided in the positioning sleeve 71, which is radially penetrating the positioning sleeve 71 and allowing the elastic cylindrical pin 73 to be inserted. The outer diameter change at the right end of the positioning sleeve 72 is used to insert the positioning end 721 of the positioning hole 76, and the diameter change at this point forms a stepped surface 722 that can abut against the inner wall of the upper right side wall 213 of the hollow column 2 when the positioning end 721 of the positioning sleeve 72 is inserted into the positioning hole 76. A worm gear winding wheel 7 is provided with An axial through hole 78 is provided in the worm gear winding wheel 7; a radial through hole 741 is provided at the left end of the rotating shaft 74, which is radially through the rotating shaft 74 and allows the insertion of an elastic cylindrical pin 73; the positioning end 711 of the positioning sleeve 71 is inserted into the positioning hole 75 of the upper left side wall 212 of the hollow column 2, and its stepped surface 712 is attached to the inner wall of the upper left side wall 212 of the hollow column 2; the positioning end 721 of the positioning sleeve 72 is inserted into the positioning hole 76 of the upper right side wall 213 of the hollow column 2, and its stepped surface 722 is attached to the inner wall of the upper right side wall 213 of the hollow column 2; the rotating shaft 74 passes through the central hole 714 of the positioning sleeve 71 and the worm gear winding wheel 7 in sequence. The axial through hole 78 of the spool 7 and the center hole 723 of the positioning sleeve 72 are connected. At this time, the radial through hole 741 of the rotating shaft 74 corresponds to the radial through hole 713 of the positioning sleeve 71. The elastic cylindrical pin 73 passes through the corresponding radial through hole 713 and radial through hole 741 to connect the positioning sleeve 71 and the rotating shaft 74, thereby rotatably installing the worm gear winding spool 7 in the hollow column cavity 211. The specific installation structure of the worm gear winding spool 7 is simple, and the worm gear winding spool 7 can be easily disassembled and assembled. When the worm gear winding spool is damaged, only a single worm gear winding spool needs to be replaced, without replacing the entire tennis post, thus reducing the cost of use.

[0031] In this embodiment, the specific installation structure of the worm gear 8 includes: a positioning sleeve 3 82, a positioning sleeve 4 83, an elastic cylindrical pin 2 84, and a fixing ring 85. A positioning hole 3 86, penetrating into the inner cavity 211 of the hollow column 2 and with a diameter larger than the diameter of the worm gear 8, is provided on the front sidewall 214 of the upper part of the hollow column 2. A positioning hole 4 87, penetrating into the inner cavity 211 of the hollow column 2 and with a diameter smaller than the diameter of the worm gear 8, is provided on the rear sidewall 215 of the upper part of the hollow column 2. The positioning sleeve 3 82, the worm gear 8, and the positioning sleeve 4 83 are sequentially arranged from front to back between the front sidewall 214 and the rear sidewall 215 of the upper part of the hollow column 2. The outer diameter of the front end of the positioning sleeve 3 82 is adjusted to insert into the positioning end 3 821 of the positioning hole 3 86, and the adjusted diameter... When the positioning end 821 of the positioning sleeve 3 82 is inserted into the positioning hole 3 86, a stepped surface 3 822 is formed that can abut against the inner wall of the upper front sidewall 214 of the hollow column 2. The diameter of the central hole 823 of the positioning sleeve 3 82 is larger than the diameter of the worm gear 8 so that the worm gear 8 can be inserted into the inner cavity 211 of the hollow column through the central hole 823 of the positioning sleeve 3 82. The outer diameter of the rear end of the positioning sleeve 4 83 is used to insert the positioning end 4 831 of the positioning hole 4 87, and this diameter change forms a stepped surface 4 832 that can abut against the inner wall of the upper rear sidewall 215 of the hollow column 2 when the positioning end 4 831 of the positioning sleeve 4 83 is inserted into the positioning hole 4 87. The diameter change of the rear end of the worm gear 8 forms a small-diameter insertion end 88 that can be inserted into the central hole 833 of the positioning sleeve 4, for use with A drive unit 81, which cooperates with the crank handle 10 to rotate the worm gear 8, is located at the front end of the worm gear 8. A fixing ring 85 is sleeved on the front end of the worm gear 8, and the outer diameter of the fixing ring 85 is larger than the diameter of the central hole 823 of the positioning sleeve 82. A radial through hole 851 is provided in the fixing ring 85, through which a flexible cylindrical pin 84 is inserted. A radial through hole 89 is provided at the front end of the worm gear 8, through which a flexible cylindrical pin 84 is inserted. The positioning end 821 of the positioning sleeve 82 is inserted into the positioning hole 86 of the upper front sidewall 214 of the hollow column 2, and its stepped surface 822 is attached to the inner wall of the upper front sidewall 214 of the hollow column 2. The positioning end 831 of the positioning sleeve 83 is inserted into the hollow column. The positioning hole 87 of the upper rear sidewall 215 and its stepped surface 832 are attached to the inner wall of the upper rear sidewall 215 of the hollow column 2. The worm 8 is inserted into the hollow column cavity 211 through the center hole 823 of the positioning sleeve 82 and passes through the fixing ring 85 until its small diameter insertion end 88 is inserted into the center hole 833 of the positioning sleeve 83. The fixing ring 85 is pressed against the rear end face of the positioning sleeve 82, and at this time the radial through hole 851 of the fixing ring 85 corresponds to the radial through hole 89 at the front end of the worm 8. The elastic cylindrical pin 84 is inserted into the corresponding radial through hole 851 and radial through hole 89 to connect the fixing ring 85 and the worm 8, so that the worm 8 can be rotatably installed in the hollow column cavity 211.The aforementioned worm gear 8 has a simple installation structure, allowing for easy assembly and disassembly. When the worm gear is damaged, only the individual worm gear needs to be replaced, eliminating the need to replace the entire tennis post and reducing operating costs.

[0032] The advantages of this invention are: (1) The tennis post can be adjusted by adjusting the position of the adjusting flange on the tennis post to control the depth of the tennis post inserted into the embedded part, thereby controlling and adjusting the height of the tennis post, which is convenient to use; (2) The worm gear winding wheel and worm of the tennis post are easy to disassemble and assemble. When any part of the worm gear winding wheel and worm is damaged, only the individual part needs to be replaced, without replacing the entire tennis post, which reduces the cost of use.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A tennis post, characterized in that: The device includes a hollow column for inserting embedded parts. An adjusting flange is slidably fitted on the lower part of the hollow column. The adjusting flange is locked and fixed to the hollow column by a locking assembly. After the hollow column is inserted into the embedded parts, the adjusting flange will press down on the embedded parts to control the insertion depth of the hollow column into the embedded parts. The top of the hollow column is open, and an end cap is provided at the top of the open end of the hollow column. A wire guide wheel is supported inside the end cap, and a wire guide hole is provided on the side wall of the end cap. A worm gear winding wheel and a worm are rotatably installed in the upper inner cavity of the hollow column. A winding hook is fixed on the worm gear winding wheel. The worm meshes with the worm gear winding wheel. A drive part is installed at one end of the worm to cooperate with a crank handle to rotate the worm. Several net hooks for cooperating with the side of the net are installed on the outer wall of the hollow column from top to bottom at intervals. The specific installation structure of the worm gear winding wheel includes: a positioning sleeve 1, a positioning sleeve 2, an elastic cylindrical pin 1, and a rotating shaft 1. Positioning holes 1 and 2, penetrating into the inner cavity of the hollow column, are coaxially arranged on the left and right opposite side walls of the upper part of the hollow column, respectively. The positioning sleeve 1, the worm gear winding wheel, and the positioning sleeve 2 are sequentially arranged from left to right between the left and right opposite side walls of the upper part of the hollow column. The outer diameter of the left end of the positioning sleeve 1 is adjusted to insert into the positioning end 1 of the positioning hole 1, and this adjustment forms a stepped surface 1 that, when the positioning end 1 of the positioning sleeve 1 is inserted into the positioning hole 1, can adhere to the inner wall of the left side wall of the upper part of the hollow column. A radial through hole 1 is provided in the positioning sleeve 1, which radially penetrates the positioning sleeve 1 and allows the elastic cylindrical pin 1 to be inserted. The outer diameter of the right end of the positioning sleeve 2 is adjusted to insert into the positioning end 2 of the positioning hole 2, and this adjustment forms a surface that, when the positioning end 2 of the positioning sleeve 2 is inserted into the positioning hole 2, can adhere to the right side wall of the upper part of the hollow column. The inner wall has a stepped surface two; an axial through hole one is provided in the worm gear winding wheel; a radial through hole two is provided at the left end of the rotating shaft one, which is radially through the rotating shaft one and allows the insertion of an elastic cylindrical pin one; the positioning end one of the positioning sleeve one is inserted into the positioning hole one on the upper left side wall of the hollow column and its stepped surface one is attached to the inner wall of the upper left side wall of the hollow column; the positioning end two of the positioning sleeve two is inserted into the positioning hole two on the upper right side wall of the hollow column and its stepped surface two is attached to the inner wall of the upper right side wall of the hollow column; the rotating shaft one passes through the center hole of the positioning sleeve one, the axial through hole one of the worm gear winding wheel, and the center hole of the positioning sleeve two in sequence, and at this time the radial through hole two of the rotating shaft one corresponds exactly to the radial through hole one of the positioning sleeve one; the elastic cylindrical pin one is inserted into the corresponding radial through hole one and radial through hole two to connect the positioning sleeve one and the rotating shaft one, thereby rotatably installing the worm gear winding wheel in the inner cavity of the hollow column. The specific installation structure of the worm gear includes: positioning sleeve three, positioning sleeve four, elastic cylindrical pin two, and a retaining ring. A positioning hole three, penetrating into the inner cavity of the hollow column and with a diameter larger than the worm gear diameter, is provided on the front side wall of the upper part of the hollow column. A positioning hole four, penetrating into the inner cavity of the hollow column and with a diameter smaller than the worm gear diameter, is provided on the rear side wall of the upper part of the hollow column. The positioning sleeve three, the worm gear, and the positioning sleeve four are sequentially arranged from front to back between the two opposite side walls of the upper part of the hollow column. The outer diameter of the front end of the positioning sleeve three is adjusted to insert into the positioning end three of the positioning hole three, and this adjustment... The positioning sleeve three has a stepped surface three that, when inserted into the positioning hole three, can adhere to the inner wall of the upper front side wall of the hollow column. The central hole diameter of the positioning sleeve three is larger than the worm gear diameter so that the worm gear can be inserted into the inner cavity of the hollow column through the central hole of the positioning sleeve three. The outer diameter of the rear end of the positioning sleeve four is used to insert the positioning end four of the positioning hole four, and this diameter change forms a stepped surface four that, when inserted into the positioning hole four, can adhere to the inner wall of the upper rear side wall of the hollow column. The diameter change of the rear end of the worm gear forms a small-diameter insertion end that can be inserted into the central hole of the positioning sleeve four. A drive unit that cooperates with the crank handle to rotate the worm gear is located at the front end of the worm gear. A retaining ring is sleeved on the front end of the worm gear, and the outer diameter of the retaining ring is larger than the central hole diameter of the positioning sleeve three. A radial through hole three is provided in the retaining ring, allowing the insertion of an elastic cylindrical pin two. A radial through hole four is provided at the front end of the worm gear, allowing the insertion of an elastic cylindrical pin two. The positioning end three of the positioning sleeve three is inserted into the positioning hole three on the upper front sidewall of the hollow column, and its stepped surface three is attached to the inner wall of the upper front sidewall of the hollow column. The positioning end four of the positioning sleeve four is inserted into the hollow... The positioning hole four on the upper rear side wall of the column and its stepped surface four are attached to the inner wall of the upper rear side wall of the hollow column. The worm gear is inserted into the inner cavity of the hollow column through the center hole of the positioning sleeve three and passes through the fixing ring until its small-diameter insertion end is inserted into the center hole of the positioning sleeve four. The fixing ring is pressed against the rear end face of the positioning sleeve three, and at this time the radial through hole three of the fixing ring corresponds exactly to the radial through hole four at the front end of the worm gear. The elastic cylindrical pin two is inserted into the corresponding radial through hole three and radial through hole four to connect the fixing ring and the worm gear, thereby rotatably installing the worm gear in the inner cavity of the hollow column.

2. A tennis post according to claim 1, characterized in that: The drive part of the worm gear is a groove that mates with an internal hexagonal crank handle, or a protrusion that mates with an external hexagonal crank handle.

3. A tennis post according to claim 1, characterized in that: The bottom surface of the end cap is provided with four positioning posts distributed at the four corners of the bottom surface. The end cap is inserted into the top of the opening of the hollow column through the four positioning posts.

4. A tennis post according to claim 1, characterized in that: The specific installation structure of the mesh hook includes: a vertical groove is provided on the outer wall of the hollow column; limiting stops extending inward into the vertical groove are provided on both sides of the groove opening; a gap is left between the limiting stops on both sides; the vertical groove and the limiting stops on both sides together form a limiting vertical groove; a mesh hook slide is slidably installed in the limiting vertical groove; the mesh hook is fixed on the mesh hook slide; the mesh hook moves up and down along the limiting vertical groove through the mesh hook slide; locking screw holes are provided at the upper and lower ends of the mesh hook slide; a self-tapping screw is threaded into each locking screw hole; tightening the self-tapping screw inward makes the self-tapping screw press against the bottom wall of the limiting vertical groove, thereby installing the mesh hook on the hollow column.

5. A tennis post according to claim 1, characterized in that: The locking assembly consists of several threaded locking holes extending laterally to the flange opening on the outer wall of the adjusting flange. Each threaded locking hole is threaded with a tightening bolt. Tightening the tightening bolts inward causes them to press against the outer wall of the hollow column, thereby locking and fixing the adjusting flange to the hollow column.

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