Projection equipment for guiding walking in court
By using a synchronized design of components and moving lenses, the problem of insufficient brightness and reduced clarity of projection devices in strong light environments is solved, achieving efficient projection effects under strong light conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-08
- Publication Date
- 2026-04-07
AI Technical Summary
In strong light environments, existing projection equipment used for ball movement guidance suffers from light interference, resulting in insufficient brightness and reduced clarity of the projected image, thus affecting the effectiveness of movement guidance.
The system employs a synchronous component to achieve synchronized reverse displacement of the adjustment cylinder and the movable lens, thereby enhancing light blocking and reducing the size of the projected pattern. Combined with the movement of the movable lens and the linkage of the arc-shaped piston motion, it achieves air filtration and lens cleaning, improving brightness and clarity.
In bright light environments, it significantly improves device compatibility, ensures projection clarity, avoids the impact of dust accumulation, and ensures effective positioning guidance.
Smart Images
Figure CN121806359A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of projection technology, specifically to a projection device for guiding movement on a sports field. Background Technology
[0002] Projection equipment for court movement guidance is an important auxiliary device in the field of sports training and tactical guidance. Its core function is to present abstract tactical arrangements to athletes intuitively by projecting clear movement guidance patterns such as running routes, position markings, and tactical zone divisions. This helps athletes quickly understand tactical intentions and standardize their movement movements. Especially in team ball sports such as basketball, football, and volleyball, during intensive training, group matches, and timeouts in actual combat, it can effectively shorten the time for tactical explanations and improve the accuracy of tactical execution. It is one of the key devices for improving training efficiency and competitive level.
[0003] To address the impact of outdoor lighting conditions on the pitch, some existing projection equipment for ballparking guidance on the market has added a light-blocking structure to the outside of the lens barrel. This physical blocking reduces the amount of direct sunlight entering the lens and thus minimizes light interference with the projected image. However, when the outdoor light suddenly intensifies, even with the light-blocking sleeve expanding the range, the light will still be dispersed over a large projection area, resulting in insufficient image brightness and reduced clarity, thereby affecting the ballparking guidance effect. Summary of the Invention
[0004] The purpose of this invention is to provide a projection device for guiding movement on a sports field, 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 projection device for guiding movement on a sports field, comprising a device housing, a top cover detachably mounted on the top of the device housing, a projection assembly disposed inside the device housing, a motor fixedly mounted on the bottom inner wall of the device housing, the projection assembly including a projection module fixedly mounted inside the device housing, a lens tube fixedly connected to the outside of the projection module and penetrating the device housing, an adjusting cylinder slidably connected to the outside of the lens tube, a light-shielding cylinder rotatably connected to the outside of the adjusting cylinder, a plurality of protruding light-shielding parts integrally formed on the outer circumference of the light-shielding cylinder, a movable lens slidably mounted inside the lens tube, a fixed lens fixedly mounted inside the lens tube, two synchronization components symmetrically arranged between the movable lens and the adjusting cylinder, and a drive component disposed between the motor and the adjusting cylinder.
[0006] Preferably, the movable lens includes a mounting base slidably connected inside the lens barrel, a pressure ring is threadedly installed at one end of the mounting base near the projection module, and a lens is clamped between the mounting base and the pressure ring.
[0007] Preferably, the inner wall of the lens barrel is symmetrically provided with a sliding groove, an arc-shaped groove and a through groove. The through groove communicates with the arc-shaped groove. A filter screen is fixedly installed on the inner side of the through groove. Two L-shaped push blocks are symmetrically fixedly connected to one end of the mounting base near the fixed lens. One end of the push block is slidably connected in the sliding groove. An arc-shaped piston is slidably connected inside the arc-shaped groove. A connecting rod is fixedly connected between the push block and the arc-shaped piston.
[0008] Preferably, the fixed lens includes a second mounting base fixedly connected inside the lens barrel, and a second pressure ring is threadedly installed at one end of the second mounting base near the projection module. The second lens is clamped and installed between the second mounting base and the second pressure ring.
[0009] Preferably, two mounting slots are symmetrically opened on the outer side of the lens barrel. The synchronization component is installed in the mounting slot. The synchronization component includes a synchronization seat fixedly connected in the mounting slot. A drive wheel is rotatably connected inside the synchronization seat. A rack two and a rack one are slidably installed on the top and bottom of the synchronization seat respectively through a limiting strip. Both rack two and rack one mesh with the drive wheel. Rack two is fixedly connected to the inner wall of the adjusting cylinder. Rack one is fixedly connected to the mounting seat one.
[0010] Preferably, the drive assembly includes a fixed base and a support base fixedly connected to the inner wall of the bottom of the device housing. A reciprocating lead screw is rotatably connected inside the fixed base, and a gear is rotatably connected inside the support base. The reciprocating lead screw and the gear are respectively rotatably connected to a drive shaft through a one-way bearing. A connecting block is fixedly connected to the outer side of the adjusting cylinder, and the connecting block is threadedly connected to the reciprocating lead screw. A gear ring is fixedly sleeved on the outer side of the light-shielding cylinder, and the gear ring meshes with the gear. The drive shaft is fixedly connected to the output shaft of the motor.
[0011] Preferably, the device further includes a guide assembly, which includes a guide seat fixedly connected to the inner wall of the device housing, a guide rod slidably connected inside the guide seat, a guide block fixedly connected to the outer side of the adjusting cylinder, the guide block and the connecting block being symmetrically arranged, and the guide block and the guide rod being slidably connected.
[0012] Preferably, a limiting block is fixedly connected to the side of the guide block near the light-shielding cylinder, a fixing block is fixedly connected to the end of the connecting block near the motor, and an annular groove is provided on the side of the light-shielding cylinder near the motor. The fixing block and the limiting block are both slidably installed in the annular groove.
[0013] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a reasonable structural design and strong functionality, and has the following advantages: 1. By setting up a synchronization component, the adjustment cylinder and the movable lens can be moved synchronously in opposite directions. In strong light conditions, the adjustment cylinder moves outward to strengthen light blocking, while the movable lens moves inward to reduce the size of the projected pattern and increase brightness. This significantly improves the device's adaptability in strong light conditions, ensures the clarity of the movement guidance projection in the open environment of the stadium, and avoids affecting the movement guidance effect.
[0014] 2. By using the movement of the movable lens to link the arc-shaped piston movement, air is extracted, filtered, and accelerated through the arc-shaped groove and through-groove. During the adjustment of the movable lens, the surface of the lens is cleaned by blowing, which avoids dust accumulation and affects the projection quality. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the device housing of the present invention; Figure 3 This is a schematic diagram of the projection module and lens barrel structure of the present invention; Figure 4 This is a schematic diagram of the device housing and projection component structure of the present invention; Figure 5 This is a schematic diagram of the adjusting cylinder and the light-shielding cylinder of the present invention; Figure 6 This is a schematic diagram of the internal structure of the regulating cylinder and the light-shielding cylinder of the present invention; Figure 7 This is a schematic diagram of the lens barrel structure of the present invention; Figure 8 This is a schematic diagram of the internal structure of the lens barrel of the present invention; Figure 9 This is a schematic diagram of the movable lens and fixed lens structure of the present invention; Figure 10 This is a schematic diagram of the synchronization component structure of the present invention; Figure 11 This is a schematic diagram of the guiding component structure of the present invention; Figure 12 This is a schematic diagram of the driving component structure of the present invention.
[0016] In the diagram: 1. Equipment casing; 2. Top cover; 3. Projection assembly; 31. Projection module; 32. Lens barrel; 320. Slide groove; 321. Arc groove; 322. Through groove; 323. Mounting groove; 33. Adjusting cylinder; 34. Light shielding cylinder; 35. Drive assembly; 351. Fixing base; 352. Gear ring; 353. Annular groove; 354. Support base; 355. Gear; 356. Reciprocating lead screw; 357. Connecting block; 358. Fixing block; 359. Drive shaft; 36. Guide assembly; 361. 362. Guide seat; 363. Guide rod; 364. Guide block; 365. Limiting block; 37. Synchronization assembly; 371. Synchronization seat; 372. Rack one; 373. Drive wheel; 374. Rack two; 375. Limiting strip; 38. Movable lens; 381. Mounting seat one; 382. Lens one; 383. Pressure ring one; 384. Push block; 385. Arc piston; 386. Connecting rod; 39. Fixed lens; 391. Mounting seat two; 392. Lens two; 393. Pressure ring two; 4. Motor. Detailed Implementation
[0017] 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.
[0018] Please see Figures 1 to 12 The present invention provides a technical solution: a projection device for guiding movement on a sports field, comprising a device housing 1, a top cover 2 which is detachably installed on the top of the device housing 1 by bolts, facilitating the opening of the device housing 1 for maintenance of internal components; a projection component 3 is fixedly installed inside the device housing 1 for projecting movement guidance patterns on the sports field; a motor 4 is fixedly installed on the bottom inner wall of the device housing 1 by bolts, the motor 4 being a servo motor for facilitating precise forward and reverse rotation control; The projection assembly 3 includes a projection module 31 that is fixedly installed in the equipment housing 1 by bolts. The projection module 31 can be an existing mature high-definition projection module, which is used to generate and output a preset court movement guidance projection image. A lens barrel 32 is fixedly connected to the outside of the projection module 31 by welding and coaxially. The lens barrel 32 penetrates the side wall of the equipment housing 1 and extends to the outside, serving as an extension support structure for the lens of the projection module 31, and is used to install various lenses and adjustment components. An adjusting cylinder 33 is slidably sleeved on the outer side of the lens barrel 32. The adjusting cylinder 33 is clearance-fitted with the lens barrel 32 and can move smoothly along the axial direction of the lens barrel 32 to adjust the light-blocking range. A light-blocking cylinder 34 is rotatably sleeved on the outer side of the adjusting cylinder 33 through a bearing. The outer circumference of the light-blocking cylinder 34 is integrally formed with multiple circumferentially evenly distributed protruding light-blocking parts. By rotating the light-blocking cylinder 34, the protruding light-blocking parts can be adjusted to correspond with the direction of external light, further improving the light-blocking effect and reducing the interference of strong light on the projected image. A movable lens 38 is slidably mounted inside the lens barrel 32 along the axial direction. A fixed lens 39 is also fixedly mounted inside the lens barrel 32 by bolts. The movable lens 38 and the fixed lens 39 are spaced apart along the axial direction of the lens barrel 32. Together, they form a variable focus structure to realize the adjustment of the size of the projected pattern. When the ambient light in the stadium is strong, reducing the distance between the movable lens 38 and the fixed lens 39 can reduce the size of the projected pattern, thereby increasing the brightness of the projected pattern and ensuring that the movement guidance is clearly visible. Two synchronization components 37 are symmetrically arranged between the movable lens 38 and the adjustment cylinder 33. The synchronization components 37 are installed inside the cylinder wall of the adjustment cylinder 33 through and fixed by bolts, so as to realize the synchronous reverse displacement of the adjustment cylinder 33 and the movable lens 38. Specifically, when the adjustment cylinder 33 moves to the outside of the lens cylinder 32, the movable lens 38 moves to the inside of the lens cylinder 32 at the same time. The coordinated action of the two can simultaneously realize the light blocking enhancement and the reduction of the projected pattern, effectively ensuring the clarity of the projected image in strong light environment. A drive assembly 35 is provided between the motor 4 and the adjusting cylinder 33. The drive assembly 35 is used to transmit the output power of the motor 4 to the adjusting cylinder 33 and the light-shielding cylinder 34. By controlling the forward and reverse rotation of the motor 4, the adjusting cylinder 33 can be driven to move axially and the light-shielding cylinder 34 can be driven to rotate circumferentially, thereby realizing the multi-dimensional adjustment of the light-shielding structure.
[0019] Dust removal and cleaning can be performed during the movement of the movable lens 38 to prevent dust and impurities from accumulating and affecting projection quality. Specifically, the movable lens 38 includes a mounting base 381 slidably connected inside the lens barrel 32. The outer periphery of the mounting base 381 is clearance-fitted with the inner wall of the lens barrel 32 to ensure that the mounting base 381 can slide smoothly along the axial direction. An internal thread is provided on the inner side of the end of the mounting base 381 near the projection module 31. A pressure ring 383 is connected to this end of the mounting base 381 through the thread. A lens 382 is clamped and installed between the mounting base 381 and the pressure ring 383. The lens 382 is made of optical glass and has a detachable structure. The lens 382 can be removed by loosening the pressure ring 383, which is convenient for maintenance and replacement. Two sliding grooves 320, two arc-shaped grooves 321, and two through grooves 322 are symmetrically formed on the inner wall of the lens barrel 32. The through grooves 322 are connected to the arc-shaped grooves 321. The through grooves 322 have an isosceles trapezoidal arc-shaped structure with a smaller cross-sectional size at the end near the movable lens 38. The through grooves 322 are inclined towards the lens 382. This structure allows air to form a high-speed airflow when it is ejected from the through grooves 322, which can accurately act on the surface of the lens 382. A filter screen is fixedly installed on the inner side of the through grooves 322 by adhesive. The filter screen is made of high-density non-woven fabric and is used to filter dust and impurities in the air. Two L-shaped push blocks 384 are symmetrically fixedly connected by welding at one end of the mounting base 381 near the fixed lens 39. One end of the push block 384 is slidably embedded in the slide groove 320, which guides and limits the movement of the push block 384. An arc-shaped piston 385 is slidably connected inside the arc-shaped groove 321. The outer circumference of the arc-shaped piston 385 is tightly fitted with the inner wall of the arc-shaped groove 321 to ensure sealing performance. A connecting rod 386 is fixedly connected between the push block 384 and the arc-shaped piston 385 by welding. When the movable lens 38 moves into the lens barrel 32, the mounting base 381 drives the arc-shaped piston 385 to slide axially in the arc-shaped groove 321 through the push block 384 and the connecting rod 386, creating a negative pressure in the arc-shaped groove 321. The air at the end of the movable lens 38 closest to the outside is drawn into the arc-shaped groove 321 after being filtered by the filter screen. When the movable lens 38 is reset, the arc-shaped piston 385 slides in the opposite direction to compress the air in the arc-shaped groove 321. The compressed air is accelerated and ejected through the through groove 322 to blow and clean the surface of the lens 382, realizing the simultaneous adjustment of the movable lens and the cleaning of the lens.
[0020] The fixed lens 39 includes a mounting base 391 that is fixedly connected to the lens barrel 32 by bolts. A pressure ring 393 is threadedly connected to the inner side of the end of the mounting base 391 near the projection module 31. A lens 392 is clamped and installed between the mounting base 391 and the pressure ring 393. The lens 392 is also made of optical glass, which realizes the fixed installation of the lens 392 in the lens barrel 32. The lens 392 can be disassembled and replaced for easy maintenance.
[0021] Two mounting slots 323 are symmetrically provided on the outer side of the lens barrel 32. The synchronization component 37 is installed in the mounting slot 323. The mounting slot 323 provides installation space for the synchronization component 37, while preventing the synchronization component 37 from protruding from the surface of the lens barrel 32 and affecting the sliding of the adjustment cylinder 33. The synchronization assembly 37 includes a synchronization seat 371 fixedly connected to the mounting groove 323 by bolts. A drive wheel 373 is rotatably connected inside the synchronization seat 371 via a mounting shaft. A rack 372 and a rack 374 are slidably mounted on the top and bottom of the synchronization seat 371 via limiting strips 375, respectively. Both rack 372 and rack 374 mesh with the drive wheel 373 to form a transmission mechanism. Rack 374 is fixedly connected to the inner wall of the adjusting cylinder 33 by bolts, and rack 372 is fixedly connected to the outer side of the mounting seat 381 by bolts. The limiting strip 375 is fixed to the synchronous seat 371 by bolts to limit the movement trajectory of rack 2 374 and rack 1 372, prevent them from disengaging from the drive wheel 373, and ensure transmission stability. When the adjusting cylinder 33 moves, it drives rack 2 374 to move synchronously. Rack 2 374 drives rack 1 372 to move in the opposite direction through the drive wheel 373, thereby driving the mounting seat 1 381 to move synchronously in the opposite direction with the adjusting cylinder 33.
[0022] The drive assembly 35 includes a fixed base 351 and a support base 354, which are bolted to the inner wall of the bottom of the equipment housing 1. A reciprocating screw 356 is rotatably connected inside the fixed base 351 via a bearing, and a gear 355 is rotatably connected inside the support base 354 via a bearing. The reciprocating screw 356 and the gear 355 are respectively rotatably mounted on the drive shaft 359 via one-way bearings. The two one-way bearings have opposite allowable rotation directions, that is, one one-way bearing transmits torque when the drive shaft 359 rotates forward and idles when it rotates in reverse; the other one-way bearing transmits torque when the drive shaft 359 rotates in reverse and idles when it rotates forward. A connecting block 357 is fixedly connected to the outer side of the adjusting cylinder 33 by welding. The connecting block 357 is threadedly connected to the reciprocating screw 356 to form a helical transmission pair. When the reciprocating screw 356 rotates, it can drive the connecting block 357 to move along the axial direction of the reciprocating screw 356, thereby driving the adjusting cylinder 33 to move synchronously. A gear ring 352 is fixedly sleeved on the outer side of the light-shielding cylinder 34 by welding. The gear ring 352 meshes with the gear 355 to form a transmission mechanism. The light-shielding cylinder 34 remains meshed as it moves with the adjusting cylinder 33. The drive shaft 359 is fixedly connected to the output shaft of the motor 4 through a coupling. When motor 4 rotates forward, drive shaft 359 drives reciprocating screw 356 to rotate through corresponding one-way bearing, driving adjusting cylinder 33 to move axially; when motor 4 rotates in reverse, drive shaft 359 drives gear 355 to rotate through another one-way bearing, gear 355 drives gear ring 352 to rotate, thereby driving light-shielding cylinder 34 to rotate circumferentially, realizing independent drive control of adjusting cylinder movement and light-shielding cylinder rotation.
[0023] To further ensure the stability of the movement of the regulating cylinder 33, the device also includes a guide assembly 36. The guide assembly 36 includes a guide seat 361 that is fixedly connected to the inner wall of the device housing 1 by bolts. A guide rod 362 is slidably connected inside the guide seat 361. A guide block 363 is also fixedly connected to the outer side of the regulating cylinder 33 by welding. The guide block 363 and the connecting block 357 are symmetrically arranged, and the guide block 363 is slidably connected to the guide rod 362. When the adjusting cylinder 33 moves, it drives the guide block 363 to slide synchronously along the guide rod 362. The guide rod 362 guides and limits the movement of the guide block 363, effectively preventing the adjusting cylinder 33 from deviating or rotating during its movement and ensuring its movement stability.
[0024] A guide block 363 is fixedly connected to a limit block 364 by welding on the side near the light-shielding cylinder 34, and a fixing block 358 is fixedly connected to the end of the connecting block 357 near the motor 4 by welding. An annular groove 353 is provided on the side of the light-shielding cylinder 34 near the motor 4, and both the fixing block 358 and the limit block 364 are slidably embedded in the annular groove 353. The cooperation between the fixing block 358 and the limit block 364 and the annular groove 353 can ensure the smooth rotation of the light-shielding cylinder 34 while playing an axial limiting role on the light-shielding cylinder 34, preventing the light-shielding cylinder 34 from axially shifting, and at the same time not affecting the relative movement between the adjusting cylinder 33 and the light-shielding cylinder 34.
[0025] Working principle: During use, the device is installed in a suitable location on the court, and the projection module 31 projects a court movement guide pattern. When the ambient light is strong, the motor 4 is started and rotates forward. The motor 4 drives the reciprocating screw 356 to rotate via the drive shaft 359 and the corresponding one-way bearing. The reciprocating screw 356 drives the connecting block 357 to move the adjusting cylinder 33 outwards towards the lens tube 32. The lens tube 32 drives the light-shielding cylinder 34 to move synchronously, and the outer gear ring 352 of the light-shielding cylinder 34 and the gear 355 remain engaged to achieve light blocking. Simultaneously, the adjusting cylinder 33 drives the rack 2 374 to move, and the rack 2 374 drives the rack 1 372 to move in the opposite direction via the drive wheel 373. The rack 1 372 drives the mounting base 1... 381 moves into the lens barrel 32, reducing the distance between lens one 382 and lens two 392, and shrinking the projected pattern to increase brightness; during this process, mounting base one 381 drives the arc piston 385 to slide through push block 384 and connecting rod 386, drawing in filtered air; when the angle of the light shield 34 needs to be adjusted, control motor 4 reverses, drive shaft 359 drives gear 355 to rotate through another one-way bearing, gear 355 drives gear ring 352 to rotate the light shield 34, so that the protruding light shielding part corresponds to the direction of illumination; when the movable lens 38 is reset, the arc piston 385 slides in the opposite direction, and compressed air is accelerated and ejected through through groove 322 to clean the surface of lens one 382.
[0026] 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 projection device for guiding movement on a sports field, characterized in that: The device includes a housing (1), a top cover (2) is detachably installed on the top of the housing (1), a projection assembly (3) is provided inside the housing (1), a motor (4) is fixedly installed on the bottom inner wall of the housing (1), the projection assembly (3) includes a projection module (31) fixedly installed inside the housing (1), a lens barrel (32) that penetrates the housing (1) is fixedly connected to the outside of the projection module (31), an adjustment cylinder (33) is slidably connected to the outside of the lens barrel (32), a light shield (34) is rotatably connected to the outside of the adjustment cylinder (33), a plurality of protruding light shielding parts are integrally formed on the outer circumference of the light shield (34), a movable lens (38) is slidably installed inside the lens barrel (32), a fixed lens (39) is fixedly installed inside the lens barrel (32), two synchronization components (37) are symmetrically arranged between the movable lens (38) and the adjustment cylinder (33), and a drive component (35) is arranged between the motor (4) and the adjustment cylinder (33).
2. The projection device for guiding movement on a sports field according to claim 1, characterized in that: The movable lens (38) includes a mounting base (381) that is slidably connected inside the lens barrel (32). A pressure ring (383) is threadedly installed at one end of the mounting base (381) near the projection module (31). A lens (382) is clamped between the mounting base (381) and the pressure ring (383).
3. The projection device for guiding movement on a sports field according to claim 2, characterized in that: The inner wall of the lens barrel (32) is symmetrically provided with a sliding groove (320), an arc groove (321) and a through groove (322). The through groove (322) is connected to the arc groove (321). A filter screen is fixedly installed on the inner side of the through groove (322). Two L-shaped push blocks (384) are symmetrically fixedly connected to one end of the mounting base (381) near the fixed lens (39). One end of the push block (384) is slidably connected in the sliding groove (320). An arc piston (385) is slidably connected inside the arc groove (321). A connecting rod (386) is fixedly connected between the push block (384) and the arc piston (385).
4. The projection device for guiding movement on a sports field according to claim 1, characterized in that: The fixed lens (39) includes a mounting base two (391) fixedly connected inside the lens barrel (32). A pressure ring two (393) is threadedly installed at one end of the mounting base two (391) near the projection module (31). A lens two (392) is clamped between the mounting base two (391) and the pressure ring two (393).
5. A projection device for guiding movement on a sports field according to claim 1, characterized in that: Two mounting slots (323) are symmetrically opened on the outer side of the lens barrel (32). The synchronization component (37) is installed in the mounting slot (323). The synchronization component (37) includes a synchronization seat (371) fixedly connected in the mounting slot (323). A drive wheel (373) is rotatably connected inside the synchronization seat (371). A rack two (374) and a rack one (372) are slidably installed on the top and bottom of the synchronization seat (371) respectively through a limiting strip (375). Both rack two (374) and rack one (372) are engaged with the drive wheel (373). Rack two (374) is fixedly connected to the inner wall of the adjusting cylinder (33). Rack one (372) is fixedly connected to the mounting seat one (381).
6. The projection device for guiding movement on a sports field according to claim 1, characterized in that: The drive assembly (35) includes a fixed seat (351) and a support seat (354) fixedly connected to the inner wall of the bottom of the equipment housing (1). The fixed seat (351) is rotatably connected to a reciprocating screw (356), and the support seat (354) is rotatably connected to a gear (355). The reciprocating screw (356) and the gear (355) are respectively rotatably connected to a drive shaft (359) through a one-way bearing. A connecting block (357) is fixedly connected to the outside of the adjusting cylinder (33). The connecting block (357) is threadedly connected to the reciprocating screw (356). A gear ring (352) is fixedly sleeved on the outside of the light-shielding cylinder (34). The gear ring (352) meshes with the gear (355). The drive shaft (359) is fixedly connected to the output shaft of the motor (4).
7. A projection device for guiding movement on a sports field according to claim 6, characterized in that: It also includes a guide assembly (36), which includes a guide seat (361) fixedly connected to the inner wall of the equipment housing (1), a guide rod (362) slidably connected inside the guide seat (361), and a guide block (363) fixedly connected to the outer side of the adjusting cylinder (33). The guide block (363) and the connecting block (357) are symmetrically arranged, and the guide block (363) and the guide rod (362) are slidably connected.
8. A projection device for guiding movement on a sports field according to claim 7, characterized in that: The guide block (363) is fixedly connected to the side of the light-shielding cylinder (34) with a limiting block (364). The connecting block (357) is fixedly connected to the end of the motor (4) with a fixing block (358). The light-shielding cylinder (34) is provided with an annular groove (353) on the side of the motor (4). The fixing block (358) and the limiting block (364) are both slidably installed in the annular groove (353).