A collapsing mechanism for radar and photoelectric detectors that can automatically achieve zero-gap positioning

Abstract

This invention relates to a tilting mechanism for radar and photoelectric detectors capable of automatic zero-gap positioning, comprising a base, a rotating base, a tilting shaft, a drive unit, and a backlash elimination device. The rotating base serves as the support foundation for the detector and is connected to the base via left and right tilting shafts. The drive unit employs a transmission chain consisting of a motor, a reducer, a worm gear, and a two-stage gear, driving the detector to tilt and stand around the tilting shaft. The motor, reducer, and worm gear are arranged in a straight line and fixed to the base. The worm gear and the two-stage gear are connected to the base via a first transmission shaft, a second transmission shaft, and the tilting shaft. The entire transmission system has an acute-angle layout. The backlash elimination device achieves zero-gap positioning at the transport position. This invention enables zero-gap positioning of the detector in both the working and transport positions, ensuring the detector's pointing accuracy and transport safety. It features high precision, high reliability, and both automatic and manual operation capabilities.

Description

Technical Field

[0001] This invention relates to the fields of photoelectric and radar detection technology, and in particular to a collapsing mechanism that can achieve fully automatic zero-gap positioning. Background Technology

[0002] To ensure rapid deployment and quick concealment, mobile radar and photoelectric detection equipment are widely used in the military, meteorology, and public security fields. Radar and photoelectric detectors are generally mounted on the top of vehicles to ensure detection range. At the same time, mobile equipment must meet the height restrictions for transportation by road, rail, and air. Therefore, a tripping mechanism is used to switch between working and transportation modes.

[0003] Commonly used tilting mechanisms include multi-link, push-rod, and direct-torsion types. Multi-link tilting mechanisms require a large torque to drive the linkage, so the drive motor is large or a high-ratio transmission chain is needed. Both the linkage and the transmission chain occupy a large space, and the rigidity is poor, making it prone to instability, so they are rarely used. Push-rod tilting mechanisms use electric or hydraulic cylinders, which have good rigidity and stability, but require space for rotation behind the load, making them unsuitable for situations with limited space, especially those with low height. Direct-torsion tilting mechanisms require a large torque to drive the load, and often use a worm gear and gear transmission. The structure is simple, but how to arrange a high-ratio transmission chain in a small space is a challenge.

[0004] Radar and photoelectric detectors both have high requirements for the levelness and stability of the mounting platform, often requiring zero-gap positioning to ensure the detector's working accuracy. However, the gaps at the hinges of multi-link and push-rod type tilting mechanisms cannot be eliminated, and the gear backlash of direct-torsion tilting mechanisms is also difficult to eliminate. In some cases, manual or electric locking pins and locking holes are used for positioning, but sufficient clearance must be maintained for long-term repeated use of the pin-hole fit, and the locking shaft is prone to deformation and wear after long-term transportation and working stress. Therefore, the existing tilting mechanisms have poor positioning accuracy and repeatability, cannot achieve zero-gap positioning, and cannot meet the working requirements of radar and photoelectric detectors. Summary of the Invention

[0005] Technical problems to be solved

[0006] To address the shortcomings of existing manual tilting mechanisms, a photoelectric and radar tilting mechanism with mechanical stops and inclined plane locking in fully automatic mode is provided. This mechanism can achieve zero-gap positioning of the working position and features high precision, low power consumption, high reliability, and both automatic and manual functions.

[0007] Technical solution

[0008] A collapsing mechanism for radar and photoelectric detectors capable of automatic zero-gap positioning is characterized by comprising a base, a rotating base, collapsing shafts, a drive device, and a gap-eliminating device. The base serves as the mounting foundation for the entire collapsing mechanism and is fixedly connected to the mounting platform via its bottom mounting interface. The rotating base serves as the supporting mounting foundation for the detector. There are two collapsing shafts, one on the left and one on the right, which are fixedly connected to the two sides of the rotating base and pass through the two sides of the base, forming a rotatable connection with the base via bearings. The drive device drives the rotating base to complete the collapsing function. The gap-eliminating device achieves zero-gap positioning in both working and transport states.

[0009] A further technical solution of the present invention: The base adopts a U-shaped structure design, with the drive device installed in the left compartment and the control equipment installed in the right compartment, which serves as the structural support for the entire collapse system.

[0010] A further technical solution of the present invention: the rotating base is tiger mouth shaped and is connected to the base through left and right inverted shafts. The detector is fixed on the rotating base and realizes the conversion of setting up and retraction as the inverted shafts rotate.

[0011] A further technical solution of the present invention: The drive device adopts a transmission chain of motor + reducer + worm gear + two-stage gears. The entire transmission system is arranged at an acute angle, including a motor, reducer, worm gear, worm, and two-stage cylindrical gears. The motor, reducer, and worm are arranged in a straight line and fixed on the base. The worm gear and the first gear are mounted on the first transmission shaft. The second and third gears are both mounted on the second transmission shaft. The fourth gear is mounted on the inclined shaft. The first transmission shaft, the second transmission shaft, and the inclined shaft are all mounted on the base. The line connecting the motor to the worm and the line connecting the first transmission shaft through the second transmission shaft to the inclined shaft form an acute angle.

[0012] A further technical solution of the present invention: the speed ratio range of the reducer is (20~50):1, the transmission ratio range of the worm gear is (25~50):1, and the total reduction ratio of the two-stage gears is (2~8):1.

[0013] A further technical solution of the present invention: The backlash elimination device includes backlash elimination mechanisms on the left and right sides, a working position stop, a working position wedge, a transport position stop, and a transport position wedge. The left and right backlash elimination mechanisms are fixed on the platform at the front end of the middle section of the rotating base. The working position stop and the working position wedge are installed on the top of the left and right support arms of the U-shaped base. The transport position stop is installed on the boss at the front end of the bottom of the base. The transport position wedges are fixed on the bottom of the rear ends of both sides of the base. In the upright working state, the rotating base first presses the working position stop upward, and then the backlash elimination mechanism extends the locking pin. When the inclined surface of the locking pin is in contact with the working position wedge... After the inclined planes make contact, the radial force generated by the inclined planes will push the rotating seat to further press against the working position stop. At this time, the forward and reverse rotation gaps of the rotating seat are completely eliminated, achieving zero-gap positioning of the working position, and the erection is completed. In the transport state of the collapsing mechanism, the rotating seat first contacts and presses against the transport position stop fixed on the base. Then, the gap elimination mechanism extends the locking pin. The radial force generated after the inclined plane of the locking pin contacts the inclined plane of the transport position wedge will further press against the transport position stop. At this time, the forward and reverse rotation gaps of the rotating seat are completely eliminated, achieving zero-gap positioning of the transport position, and the retraction is completed.

[0014] A further technical solution of the present invention: the backlash elimination mechanism can be driven by electric, pneumatic or hydraulic means to realize the linear extension and retraction of the locking pin.

[0015] A further technical solution of the present invention: the rear part of the gap elimination mechanism is equipped with a handwheel, which can drive the locking pin to extend and retract, realizing the manual gap elimination and release function.

[0016] A further technical solution of the present invention includes a hand-crank device, comprising a hand crank handle, a hand crank support, and a hand crank reducer. The output end of the hand crank reducer is fixedly connected to a worm gear, and the input end is connected to the hand crank support. The hand crank reducer reduces the torque required for hand cranking, allowing the hand cranking process to be easily completed by a single person. The hand crank support is fixed to the base to prevent radial wobble during hand cranking. Wear between the hand crank handle and the hand crank support is reduced during hand cranking by adding a sliding bushing. When in use, the hand crank handle is inserted into the hand crank support, driving the hand crank reducer to rotate, which in turn drives the rotating seat to rotate via the worm gear and two-stage gear transmission.

[0017] Beneficial effects

[0018] The present invention provides a tilting mechanism for radar and photoelectric detectors that can automatically achieve zero-gap positioning. Compared with the prior art, the advantages of the present invention are:

[0019] First, zero-gap positioning of the rotating seat at the working position is achieved through the working position stop, working position wedge, and backlash elimination mechanism, ensuring the pointing accuracy of the detector. Second, zero-gap positioning of the rotating seat at the transport position is achieved through the transport position stop, transport position wedge, and backlash elimination mechanism, ensuring the transport safety of the detector. The backlash elimination device has a simple structure, high repeatability, good reliability, and is easy to implement.

[0020] Secondly, by using a long transmission chain with an acute angle layout of motor + reducer + worm gear + two-stage gears, a large reduction ratio of (1000~20000):1 is achieved in a small space, which reduces the requirements for motor torque and lowers the size, power and cost of the motor.

[0021] Thirdly, the hand-crank mechanism achieves both electric and manual operation. The hand-crank support prevents handle swaying, and the hand-crank reducer significantly reduces the torque required for manual cranking. The hand-crank mechanism is simple, reliable, and easy to operate. The handwheel design of the backlash elimination mechanism enables manual backlash elimination and release. Through the manual functions of the hand-crank mechanism and the backlash elimination mechanism, all functions of the overturning mechanism can be achieved in manual mode. Attached Figure Description

[0022] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0023] Figure 1 A front view of the overturning mechanism of the present invention;

[0024] Figure 2 Top view of the overturning mechanism of the present invention;

[0025] Figure 3 Left view of the overturning mechanism of the present invention;

[0026] Figure 4 Right view of the overturning mechanism of the present invention;

[0027] Figure 5 Base structure diagram of the present invention;

[0028] Figure 6 Structural diagram of the rotating base of this invention;

[0029] Figure 7 A three-dimensional perspective view of the overturning mechanism of this invention;

[0030] Figure 8 The triangular transmission chain layout diagram of the present invention.

[0031] Wherein: 1-base; 2-rotating seat; 3-falling shaft; 4-bearing; 5-motor; 6-reducer; 7-worm; 8-worm wheel; 9-first transmission shaft; 10-first gear; 11-second transmission shaft; 12-second gear; 13-third gear; 14-fourth gear; 15-backlash elimination mechanism; 16-working position stop; 17-working position wedge; 18-transport position stop; 19-transport position wedge; 20-hand crank; 21-hand crank support; 22-hand crank reducer. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0033] This invention provides a tilting mechanism for radar and photoelectric detectors capable of automatic zero-gap positioning, comprising a base, a rotating base, a tilting shaft, a drive unit, a backlash elimination device, and a hand-cranked device. The base serves as the mounting foundation for the entire tilting mechanism; the rotating base supports the detector and is connected to the base via left and right tilting shafts; the drive unit employs a transmission chain consisting of a motor, reducer, worm gear, and two-stage gears, driving the detector to complete 0-90° erection and tilting around the tilting shaft. The motor, reducer, and worm gear are arranged in a straight line and fixed to the base. The worm gear and two-stage gears are connected to the base via a first transmission shaft, a second transmission shaft, and the tilting shaft. The entire transmission system has an acute-angle layout, allowing for the arrangement of a relatively long [detector] within a limited space. The transmission chain achieves a high speed ratio drive of (1000~20000):1; the backlash elimination device includes fourth gears on both sides, a working position stop, a working position wedge, a transport position stop, and a transport position wedge. The fourth gears, working position stop, and working position wedge achieve zero-backlash positioning of the detector at the working position, and the transport position stop, transport position wedge, and fourth gear achieve zero-backlash positioning at the transport position; the hand-cranked device includes a hand crank, a hand crank support, and a hand crank reducer, enabling manual erection and lowering of the collapsing mechanism. This invention achieves zero-backlash positioning of the detector at both the working and transport positions, ensuring the detector's pointing accuracy and transport safety, and features high precision, high reliability, and both automatic and manual operation capabilities.

[0034] like Figure 1-4 As shown, the device includes a base 1, a rotating seat 2, a collapsing shaft 3, a drive device, a backlash elimination device, and a hand-cranked device. Its features include: the base 1 serving as the mounting foundation for the entire collapsing mechanism, fixedly connected to the mounting platform via its bottom mounting interface; the rotating seat 2 serving as the supporting mounting foundation for the detector; two collapsing shafts 3, one on the left and one on the right, respectively fixed to the sides of the rotating seat 2 and passing through the sides of the base 1, forming a rotatable connection with the base 1 via bearings 4; the drive device includes a motor 5, a reducer 6, a worm gear 8, a worm 7, and a two-stage cylindrical gear, its main function being to drive the rotating seat to complete the collapsing function; the backlash elimination device includes backlash elimination mechanisms 15 on both sides, a working position stop 16, a working position wedge 17, a transport position stop 18, and a transport position wedge 19, achieving zero-backlash positioning in both working and transport states; and the hand-cranked device includes a hand crank 20, a hand crank support 21, and a hand crank reducer 22.

[0035] like Figure 5As shown, the base 1 adopts a U-shaped structure design. The drive device is installed in the left compartment, and the control equipment can be installed in the right compartment. It serves as the structural support for the entire collapse system. The U-shaped design does not occupy the space for the detector to collapse and rotate, and the layout is compact and reasonable.

[0036] like Figure 6 As shown, the rotating base 2 is tiger-mouth shaped and is connected to the base 1 through the left and right inverted shafts 3. The detector is fixed on the rotating base 2 and can be set up and retracted as the inverted shafts 3 rotate.

[0037] like Figure 3 As shown, the drive device employs a transmission chain consisting of a motor, a reducer, a worm gear, and a two-stage gear system, with the entire transmission system arranged at an acute angle. The motor 5, reducer 6, and worm gear 7 are arranged in a straight line and fixed to the base. The worm gear 8 and the first gear 10 are mounted on the first transmission shaft 9. The second gear 12 and the third gear 13 are both mounted on the second transmission shaft 11, and the fourth gear 14 is mounted on the folding shaft 3. The first transmission shaft 9, the second transmission shaft 11, and the folding shaft 3 are all mounted on the base 1. The line connecting the motor 5 to the worm gear 7 forms an acute angle with the line connecting the first transmission shaft 9 through the second transmission shaft 11 to the folding shaft 3. This acute-angle layout allows for a longer transmission chain within a limited space, achieving a high speed ratio drive, and using a small-power motor to achieve the folding function. The reducer's speed ratio range is (20–50):1, the worm gear's transmission ratio range is (25–50):1, and the total reduction ratio of the two-stage gear system is (2–8):1. The motor 5 drives the worm gear 7 to rotate after passing through the reducer 6. The worm gear 7 drives the worm wheel 8 and the first gear 10 to rotate. The first gear 10 meshes with the second gear 12 and drives the third gear 13 to rotate. The third gear 13 meshes with the fourth gear 14 and drives the tilting shaft 3 and the rotating seat 2 to rotate, thereby driving the detector to complete the 0-90° standing and tilting around the tilting shaft 3. At the same time, by utilizing the self-locking characteristic of the worm gear transmission, the function of self-locking in any position after power failure can be realized.

[0038] In the backlash elimination device, the left and right backlash elimination mechanisms 15 are fixed on the platform at the front end of the middle section of the rotating base 2. The working position stop 16 and the working position wedge 17 are installed on the top of the left and right support arms of the U-shaped base 1. The transport position stop 18 is installed on the boss at the front end of the bottom of the base 1. The transport position wedge 19 is fixed on the bottom of the rear ends of both sides of the base 1. In the erection working state, the rotating base 2 first presses the working position stop 16 upward, and then the backlash elimination mechanism 15 extends the locking pin. After the inclined surface of the locking pin contacts the inclined surface of the working position wedge 17, the radial force generated by the inclined surface will push the rotating base 2 to further press the working position stop 16. At this time, the backlash of the rotating base 2 in both forward and reverse rotation is completely eliminated, realizing zero-backlash positioning of the working position, and the erection is completed. In the transport state of the collapsing mechanism, the rotating seat 2 first contacts and presses against the transport position stop 18 fixed on the base 1. Then, the gap-eliminating mechanism 15 extends the locking pin. The radial force generated after the inclined surface of the locking pin contacts the inclined surface of the transport position wedge 19 further presses against the transport position stop 18. At this time, the gap between the forward and reverse rotation of the rotating seat 2 is completely eliminated, achieving zero-gap positioning of the transport position, and the retraction is completed. The gap-eliminating mechanism 15 can use electric, pneumatic, or hydraulic drive methods to realize the linear extension and retraction of the locking pin. In addition, the rear of the gap-eliminating mechanism 15 is equipped with a handwheel, which can drive the locking pin to extend and retract, realizing the manual gap-elimination and release function.

[0039] The hand-cranked device includes a hand crank 20, a hand crank support 21, and a hand crank reducer 22, enabling manual erection and lowering of the collapsing mechanism for system debugging, emergency handling, and power-off dismantling. The output end of the hand crank reducer 22 is fixedly connected to the worm gear 7, and the input end is connected to the hand crank support 21. The hand crank reducer 22 reduces the torque required for hand cranking, allowing the hand cranking process to be easily completed by a single person. The hand crank support 21 is fixed to the base 1 to prevent radial wobble during hand cranking. Wear between the hand crank 20 and the hand crank support 21 is reduced during hand cranking by adding a sliding bushing. When in use, the hand crank 20 is inserted into the hand crank support 21, driving the hand crank reducer 22 to rotate, which in turn drives the rotating seat 2 to rotate via the worm gear and two-stage gear transmission.

[0040] Figure 1-4 This paper illustrates a collapsing structure for radar and photodetectors capable of automatic zero-gap positioning. In this preferred embodiment, the collapsing mechanism enables the photodetector to collapse and achieve zero-gap positioning. The gap-eliminating mechanism uses an electric drive to achieve the linear extension and retraction of the locking pin, employing a motor + gear pair + T-screw drive method. Self-locking is achieved through the self-locking function of the T-screw. The base 1 serves as the mounting foundation for the entire collapsing mechanism. The drive unit is installed in the left compartment of the base, and the control equipment is installed in the right compartment, achieving a separate layout for structural components and electrical components, thereby optimizing the wiring layout. The photodetector is mounted on a rotating base 2, which is connected to the base 1 via left and right collapsing shafts 3 and bearings 4.

[0041] like Figure 8 As shown, the transmission of the folding system has an acute-angle layout. The motor 5, reducer 6 (speed ratio 50), worm 7, worm wheel 8 (worm wheel-worm speed ratio 30), first gear 10 (17 teeth); second gear 12 (31 teeth); third gear 13 (17 teeth); and fourth gear 14 (29 teeth) are sequentially transmitted to form the drive device. The total speed ratio is 4666:1, which realizes high speed ratio power transmission. The structure is compact and occupies little space.

[0042] The first drive shaft 9, the second drive shaft 11, and the folding shaft 3 are all mounted on the base 1. The worm gear 8 and the first gear 10 are mounted on the first drive shaft 9. The second gear 12 and the third gear 13 are both mounted on the second drive shaft 11. The fourth gear 14 is mounted on the folding shaft 3.

[0043] The control equipment includes a drive module, a filter, and a control computer, all of which are installed in the right-side compartment of the base 1 to form a lodging system control device, which completes the control of the entire lodging system.

[0044] The backlash elimination mechanism 15, the working position stop 16, and the working position wedge 17 together complete the zero-backlash positioning of the working position, and the backlash elimination mechanism 15, the transport position stop 18, and the transport position wedge 19 together complete the zero-backlash positioning of the transport position. During backlash elimination, the mechanical stop (working position stop 16 or transport position stop 18) eliminates the rotational backlash in one direction, and the contact between the inclined surface of the locking pin of the backlash elimination mechanism 15 and the inclined surface of the wedge eliminates the rotational backlash in the other direction. Zero-backlash positioning is achieved by pressing the contact surfaces in both directions.

[0045] The hand crank 20, hand crank support 21 and hand crank reducer 22 constitute a hand crank device. When in use, the hand crank 20 is inserted into the auxiliary support hole of the hand crank support 21 to complete manual erection and tilting. The hand crank reducer 22 greatly reduces the torque required for hand cranking.

[0046] The working principle of the present invention will be explained below with reference to the accompanying drawings.

[0047] When the collapsing mechanism is working, the motor 5 drives the worm 7 through the reducer 6. The worm 7 drives the worm wheel 8, which meshes with it, to move. Then, the worm wheel 8 drives the first gear 10 to rotate. The first gear 10 meshes with the second gear 12 and drives the third gear 13 to rotate. The third gear 13 meshes with the fourth gear 14 and drives the collapsing shaft 3 to rotate, thereby driving the rotating seat 2 and the photoelectric system to complete the 0-90° rotation for erection and collapsing around the collapsing shaft 3. When the system is erecting, the motor 5 drives the rotating seat 2 and the photoelectric system to rotate to the 90° position. At this time, after the rotating seat 2 is pressed against the working position stop 16, the motor 5 stops working, and the backlash elimination mechanism 15 starts working. When the locking pin extends and its inclined surface presses against the inclined surface of the working position wedge 17, the system is fully erected, thus achieving zero-gap positioning of the working position. This eliminates the rotational gap of the photodetector along the circumferential direction of the inverted axis 3, providing a high-precision working reference for the photoelectric system. When the system is retracted, the motor 5 drives the rotating seat 2 and the photodetector to rotate to the 0° position. At this time, the rotating seat 2 presses against the transport position stop 18, the motor 5 stops working, and the gap elimination mechanism 15 starts working. When the locking pin extends and its inclined surface presses against the inclined surface of the transport position wedge 19, the system is retracted, thus achieving zero-gap positioning of the transport position and preventing the photodetector from being affected by alternating loads caused by positioning gaps during transport.

[0048] When manually setting up or dismantling, the hand crank 20 is inserted into the hand crank support 21 to drive the hand crank reducer 22 to rotate, which in turn drives the rotating seat to rotate through the worm gear and two-stage gears. In addition, rotating the handwheel of the backlash elimination mechanism 15 can drive the extension and retraction of the locking pin, thereby realizing the elimination and release of backlash between the working position and the transport position.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in the present invention, and such modifications or substitutions should all be covered within the scope of protection of the present invention.

Claims

1. A radar or photoelectric detector lodging mechanism capable of automatically achieving zero-gap positioning, characterized in that The utility model relates to a kind of automatic erecting and folding mechanism of rice, including pedestal (1), rotating seat (2), lodging axis (3), driving device, clearance device;The pedestal (1) is the installation basis of entire lodging mechanism, and is fixedly connected with installation platform through the bottom installation interface;The rotating seat (2) is the support installation basis of detector;The lodging axis (3) is left and right two, respectively with rotating seat (2) two sides fixedly connected after passing through the both sides of pedestal (1), and forms rotatable connection with pedestal (1) by bearing (4);The driving device drives rotating seat (2) to complete lodging function;The clearance device realizes zero-gap positioning of working state and transportation state;The pedestal (1) adopts U-shaped architecture design, and its left cabin installs driving device, right cabin installs control equipment, and the pedestal (1) is the structural support of entire lodging mechanism;The rotating seat (2) is tiger mouth shape, and is connected with pedestal (1) by left and right lodging axis (3), and detector is fixedly connected on rotating seat (2), and erecting and folding mechanism is converted with the rotation of lodging axis (3) and is set up and is withdrawn;The clearance device includes left and right two sides clearance mechanism (15), working position stop (16), working position wedge (17), transportation position stop (18) and transportation position wedge (19), and left and right two sides clearance mechanism (15) is fixed on the platform of rotating seat (2) middle section front end, and working position stop (16) and working position wedge (17) are installed on the top of pedestal (1) left and right support arm, and transportation position stop (18) is installed on the boss of pedestal (1) bottom front end, and transportation position wedge (19) is fixed on the bottom of pedestal (1) both sides rear end;When erecting, rotating seat (2) is first pressed tightly working position stop (16) upwards, then clearance mechanism (15) extends lock pin, after the inclined surface of lock pin and the inclined surface of working position wedge (17) contact, the radial force generated by the inclined surface at this time will push rotating seat (2) to further press tightly working position stop (16), at this time, the clearance of rotating seat (2) is completely eliminated in positive and reverse rotation, and the zero-gap positioning of working position is realized, and erecting is completed;When folding mechanism is transported, rotating seat (2) is first contacted and pressed tightly with transportation position stop (18) fixed on pedestal (1), then clearance mechanism (15) extends lock pin, the radial force generated by the inclined surface of lock pin and the inclined surface of transportation position wedge (19) after contact will further press tightly transportation position stop (18), at this time, the clearance of rotating seat (2) is completely eliminated in positive and reverse rotation, and the zero-gap positioning of transportation position is realized, and withdrawing is completed.

2. The mechanism according to claim 1, wherein: The driving device adopts a transmission chain of motor + reducer + worm gear + two-stage cylindrical gear, the whole transmission system is arranged at an acute angle, and comprises a motor (5), a reducer (6), a worm gear (8), a worm (7) and two-stage cylindrical gears, wherein the two-stage cylindrical gears comprise a first gear (10), a second gear (12), a third gear (13) and a fourth gear (14), the motor (5), the reducer (6) and the worm (7) are arranged in a line and then fixed on a base, the worm gear (8) and the first gear (10) are installed on a first transmission shaft (9), the second gear (12) and the third gear (13) are both installed on a second transmission shaft (11), and the fourth gear (14) is installed on a lodging shaft (3), wherein the first transmission shaft (9), the second transmission shaft (11) and the lodging shaft (3) are all installed on the base (1); the line connecting the motor (5) and the worm (7) and the line connecting the first transmission shaft (9) to the second transmission shaft (11) and then to the lodging shaft (3) are arranged at an acute angle; the motor (5) drives the worm (7) to rotate after the reducer (6), the worm (7) drives the worm gear (8) and the first gear (10) to rotate, the first gear (10) drives the second gear (12) to rotate in meshing transmission and drives the third gear (13) to rotate, and the third gear (13) drives the fourth gear (14) to rotate in meshing transmission and drives the lodging shaft (3) and the rotating seat (2) to rotate.

3. A radar or photodetector laying mechanism capable of automatic zero-gap positioning according to claim 2, characterized in that: The speed ratio range of the reducer is (20-50):1, the transmission ratio range of the worm gear is (25-50):1, and the total reduction ratio of the two-stage cylindrical gears is (2-8):

1.

4. The zero-gap positioning mechanism for radar or photoelectric detector according to claim 1, wherein: The anti-backlash mechanism (15) adopts an electric, pneumatic or hydraulic driving mode to realize the functions of linear extension and retraction of the locking pin.

5. The zero-gap positioning mechanism for radar or photoelectric detector according to claim 1, wherein: The rear part of the anti-backlash mechanism (15) is provided with a hand wheel, which can drive the locking pin to extend and retract, thereby realizing the functions of manual anti-backlash and release.

6. The zero-gap positioning mechanism for radar or photoelectric detector according to claim 1, wherein: The hand-cranking device comprises a hand-cranking handle (20), a hand-cranking support (21) and a hand-cranking reducer (22), the output end of the hand-cranking reducer (22) is fixedly connected with the worm (7), the input end is connected with the hand-cranking support (21), the hand-cranking reducer (22) can reduce the required torque for hand cranking, so that the hand-cranking process can be easily completed by one person; the hand-cranking support (21) is fixed on the base (1) and is used for preventing the radial deflection of the hand-cranking handle (20) during the hand-cranking process, and the wear of the hand-cranking handle (20) and the hand-cranking support (21) during the hand-cranking process is reduced by adding a sliding shaft sleeve; the hand-cranking handle (20) is inserted into the hand-cranking support (21) during use, drives the hand-cranking reducer (22) to rotate, and then drives the rotating seat (2) to rotate through the transmission of the worm gear and the two-stage cylindrical gears.

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