27results about How to "Stable angle adjustment" patented technology

The invention discloses a multi-angle adjustable operating bed, which belongs to an operating bed in the technical field of medical equipment, and adopts the technical scheme that the multi-angle adjustable operating bed comprises a head-back plate assembly, a supporting plate, a supporting plate and a supporting plate, the seat plate assembly is provided with an angle-adjustable waist supporting plate group and a main supporting plate, and one side of the waist supporting plate group is hinged to one side of the main supporting plate; the leg plate assembly is provided with an angle-adjustable thigh supporting plate and an angle-adjustable shank supporting plate; a leg plate hydraulic cylinder group which is relatively overturned is arranged between the seat plate assembly and the leg plate assembly, and the leg plate assembly is provided with two leg supporting plate groups which can be relatively opened; according to the multi-angle adjustable operating bed provided by the invention, the legs, the waist and the head of a lying patient can be stably supported after adaptive adjustment by the operating bed, so that the patient can be adaptively placed on the operating bed by medical staff, and the patient can be conveniently subjected to surgical operation.

The utility model relates to the technical field of LED projection lamps, in particular to an angle adjusting mechanism for an LED projection lamp. Comprising a supporting assembly, an adjusting assembly and a light projection assembly, the supporting assembly comprises a supporting base, a mounting rod and limiting frames, the mounting rod is arranged on the supporting base, the limiting frames are symmetrically arranged on the two sides of the supporting base, sliding grooves are formed in the limiting frames, the adjusting assembly comprises a mounting box, and the bottom of the mounting box is connected with the mounting rod; the two sides of the mounting box are movably connected with the limiting frames, and the light projection assembly is arranged in the mounting box. According to the mechanism, the projection angle of the LED projection lamp and the number of the turned-on projection lamps can be flexibly adjusted, the application range of equipment is widened, and the mechanism can play a role in various illumination requirement scenes. The LED projection lamp is mainly applied to angle adjustment of the LED projection lamp.

The utility model discloses a special-shaped nut welding positioning device which comprises a spot welding machine, a supporting and driving supporting frame is fixed on the front surface of the spot welding machine, a cavity is formed in the supporting and driving supporting frame, an adjusting piece is arranged in the cavity in a rotating mode, a supporting piece is fixed at the top end of the adjusting piece, and a driving piece is arranged in the top end of the supporting piece in a sliding mode. A rotating clamping plate is rotatably arranged at the top end of the driving part, a driven stand column is fixed to the bottom end of the rotating clamping plate, a driven roller is rotatably arranged at the bottom end of the driven stand column, a cavity is formed in the rotating clamping plate, a sliding clamping plate is slidably arranged at the top end in the cavity, and a driving screw is rotatably arranged at the bottom end in the cavity. The driving wedge block and the driven wedge block in the driving piece are matched with each other, the driven roller is pushed through the action of the inclined face, then the rotating clamping plate is driven to rotate, the angle of the special-shaped nut is flexibly adjusted, the angle adjusting process is stable and accurate, and the welding positioning accuracy is improved.

The utility model relates to the field of non-standard metal processing devices, and discloses a work fixture with fixing performance and convenient angle adjustment, which comprises a supporting mechanism, the supporting mechanism comprises a base, an adjusting mechanism is arranged at the upper end of the supporting mechanism, and the adjusting mechanism comprises a rotary supporting table and four rotary blocks. An arc-shaped groove is formed in the rotating supporting table, a special-shaped rod is horizontally and slidably arranged in the arc-shaped groove and is parallel to the fixing column, moving blocks are fixedly connected to the two ends of the special-shaped rod, and a fixing mechanism is arranged at the upper end of the adjusting mechanism and comprises four horizontal rods. According to the tool clamp, the adjusting mechanism and the fixing mechanism are arranged in the tool clamp, the fixing mechanism can stably fix different parts of a part from different heights, the adjusting mechanism can stably adjust the angle of the fixed part, the part can be conveniently machined, and the machining quality and efficiency of the part are improved.

This invention relates to an adjustable bearing device for testing the impact damage of automotive wheel hubs. It includes an automotive wheel hub impact crusher, which comprises a frame with a hammer mounted on the upper part of the frame. A wheel hub bearing seat is positioned directly below the hammer, and the bearing seat includes a base. A longitudinal feed platform abuts against the upper surface of the base. Longitudinal guide plates are formed on both sides of the feed platform, and L-shaped guide rail brackets are fitted onto the guide plates on both sides of the feed platform. The guide rail brackets are fixed to the rear end of the base. A longitudinal screw drive mechanism is connected to the front end of the feed platform, and the screw drive mechanism is located on the front end surface of the base and drives the feed platform to move forward and backward. This device allows for convenient and rapid adjustment of the wheel hub impact angle. Its structure has high support strength, and the adjusting components are not easily deformed by impact, enabling long-term stable angle adjustment. Furthermore, the wheel hub can be moved out from under the hammer for installation and disassembly, ensuring good safety.

This utility model discloses an FA fiber array polishing angle adjustment structure, relating to the field of FA fiber array polishing technology. The technical solution includes a fiber polishing machine with a vertical drive assembly on top and an angle drive connecting frame connected to one side of the vertical drive assembly. The beneficial effects of this FA fiber array polishing angle adjustment structure are: through the three-dimensional linkage of the vertical drive assembly, the angle drive connecting frame, and the angle adjustment assembly, a multi-degree-of-freedom adjustment system of "height-horizontal angle-rotation" is constructed. Servo motor two, in conjunction with threaded rod two, can achieve continuous adjustment of the horizontal angle from 3° to 60°. Servo motor three drives the fiber rotation, and combined with the movement of the polishing disc, it can precisely process complex end faces such as conical, wedge-shaped, and spherical shapes, breaking through the limitations of traditional equipment that can only polish in a plane or at a single angle, and meeting the diverse needs of high-speed optical communication, fiber optic sensing, and other fields.

The invention belongs to the technical field of yarn covering machines and relates to pens, in particular to a yarn bobbin feeding device for a yarn covering machine, which comprises a base, a feeding device and a receiving device, the feeding device comprises a support rod arranged on the base and a feeding plate rotatably arranged on the support rod, and a plurality of feeding slideways are arranged on the feeding plate; the receiving devices are arranged on the two sides of the throwing device and used for receiving the thrown spools. The device further comprises an adjusting device. The adjusting devices are arranged on the two sides of the supporting rod, connected with the throwing plate and used for adjusting the inclination angle of the throwing plate and enabling angle adjustment of the throwing plate to be more stable. Wherein the adjusting device is arranged on the base, and the top of the adjusting device is hinged to the throwing plate.

The utility model relates to lighting device technical field, concretely relates to a classroom intelligent lighting device based on internet of things, including shell and the LED lamp lighting main part of setting in the inner wall of shell, the top of shell is fixed and installed with fixed disc at both ends, through adjusting assembly, the meshing drive of gear and arc gear bar, the sliding guide of gyro wheel in arc rail recess, thereby realize angle deflection adjustment of driving LED lamp lighting main part, control lighting equipment light projection to the specific area of classroom, can focus light on the platform area when the lighting equipment in class, enhance the lighting definition of teacher and board book, adjust the angle and make light illumination evenly cover the whole desk area, can the lighting pertinence and comfort level under different teaching scene, avoid the platform area or desk area in classroom because of light dispersion and the insufficient brightness.

This invention discloses a multi-degree-of-freedom linkage support and adjustment mechanism for gear modification, including a worktable, a support mechanism, a top bracket, a drive cylinder, a positioning and clamping mechanism, and a modification surface adjustment mechanism. The support mechanism on the worktable supports the gear to be modified before clamping. The positioning and clamping mechanism is installed at the output end of the drive cylinder and faces the center hole of the gear. When the drive cylinder presses down, it drives the positioning and clamping mechanism to open outward, thereby internally supporting and fixing the center hole of the gear. The positioning and clamping mechanism includes a first hinge plate, a second hinge plate, a first hinge rod, a second hinge rod, a central hinge block, and a clamping block. The clamping block is universally mounted via a ball joint and connected to a drive rod. The modification surface adjustment mechanism drives the drive plate to rotate via a drive motor, driving the drive rods at different positions, allowing the gear to switch between different inclined modification surfaces while clamped. This mechanism is highly versatile, provides stable clamping, reduces repetitive positioning errors, and improves gear modification efficiency.

The utility model discloses an installation adjusting device for detecting the outer contour of a vehicle through laser scanning, and belongs to the technical field of vehicle detection. The installation adjusting device for detecting the outer contour of the vehicle through laser scanning further comprises a third stepping motor embedded in the inner side of the sliding block, and the output end of the third stepping motor is fixedly connected with a first gear. The sliding block is rotationally connected with a gear II; the gear I is meshed with the gear II; the upper end of the gear II is fixedly connected with the mounting frame; the mounting frame is rotationally connected with the mounting plate; the outer side of the upper end of the mounting frame is fixedly connected with a stepping motor II; the output end of the first stepping motor is fixedly connected with a lead screw. A stepping motor I and a lead screw are arranged, and the stepping motor I and the lead screw are utilized to adapt to cart widths of different sizes, so that the adjusting efficiency is improved; and by arranging a stepping motor II and a mounting plate, the convenience of angle adjustment of the scanner is improved.

The utility model discloses a dust collector folding pipe which comprises a fixing pipe and a mounting pipe, a first fixing cylinder is mounted at one end of the fixing pipe, a first mounting cylinder is mounted at one end of the mounting pipe, a second fixing cylinder is clamped to the outer side of the first fixing cylinder, and a second mounting cylinder is rotationally connected to the outer side of the first mounting cylinder. The first fixing cylinder is connected with a fixing shaft, the first mounting cylinder is connected with a mounting seat, the second mounting cylinder is provided with a receding groove for the mounting seat to extend out, the mounting seat is hinged to the fixing shaft, and a flexible connecting pipe is detachably connected between the first fixing cylinder and the first mounting cylinder. The first fixing cylinder is connected with a fixing strip, the fixing strip is connected with a fixing block, and the inner side wall of the second mounting cylinder is connected with a locking block matched with the fixing block. The fixing block and the locking block are arranged inside, so that collision and damage are avoided, and the service life of the dust collector is ensured.

The utility model discloses an automobile air conditioner compressor swash plate machining clamp, and relates to the technical field of compressor part machining, the automobile air conditioner compressor swash plate machining clamp comprises a base, a bottom plate is arranged above the base, the top face of the bottom plate is fixedly connected with a clamping device, and the clamping device comprises fixing plates which are symmetrically distributed; fixing blocks are symmetrically and fixedly connected to the end of the fixing plate, a two-way threaded rod is movably inserted into one side of one fixing block, one end of the two-way threaded rod is rotationally connected with one side of the other fixing block, and a rotary knob is fixedly connected to the other end of the two-way threaded rod; two clamping plates are connected to the outer surface of the two-way threaded rod in a threaded and sleeved mode, sliding grooves used in cooperation with the sliding blocks are symmetrically formed in one side of the fixing plate, a swash plate can be clamped to avoid displacement, and the angle of the swash plate can be flexibly adjusted according to actual machining requirements.

The invention relates to the technical field of exhibition services, in particular to a display device for exhibition services and a method thereof.The display device comprises a display device body, the display device body comprises a bottom plate, a telescopic column, a rotating component and a main display board, and the bottom of the telescopic column is arranged at the top of the bottom plate; the bottom of the main display board is arranged at the top of the telescopic column through a rotating part, two drawing plates are arranged in the main display board, stroke grooves are formed in the tops of the two drawing plates, a rotating groove is formed in the bottom of the main display board, and the auxiliary display board can be unfolded to increase the display area when the height is adjusted; according to the display board, the angles of the main display board and the auxiliary display board can be adjusted after the auxiliary display board is unfolded, the angles of the main display board and the auxiliary display board can be adjusted more stably through the arrangement of the supporting mechanism in the angle adjusting process, the auxiliary display board can be closed after the display board is used, and a worker can conveniently store the display board.

The utility model discloses a dust removal device under a mine, and relates to the technical field of dust removal equipment in the mine. The device comprises a dry-type dust collector which is arranged in a mine, an air outlet of the dry-type dust collector is located at an air outlet of the mine, an air inlet of the dry-type dust collector is connected with an air pipe, a hanging bracket is installed at the free end of the air pipe, the two ends of the hanging bracket are respectively provided with a back shore supporting foot, the hanging bracket is provided with two sections, and the two sections of the hanging bracket are connected through a telescopic assembly. And one end of the supporting arm assembly is rotationally connected with the hanging bracket, the other end of the supporting arm assembly is rotationally connected with a positive pressure fan, and an air outlet of the positive pressure fan corresponds to an air inlet of the air pipe. According to the utility model, the two telescopically connected hanging brackets are connected through the telescopic assembly, so that the length can be adjusted according to the caliber change of different areas of a mine; the supporting arm assembly moves to the side far away from the air pipe, dust is blown to the air pipe, the dust removal rate is increased, and the air quality in a mine and the operation safety of miners are guaranteed.

The utility model discloses multi-angle manipulator hot riveting welding equipment, relates to the field of manipulator corollary equipment, and aims to solve the technical problems that in the prior art, the positions, needing to be welded, of different raw materials are not qualitative; and when a manipulator is used for configuring a hot riveting welding device, multi-angle adjustment cannot be realized to meet the requirements of different hot riveting welding positions. A connecting seat is fixedly connected to the upper end of the distance adjusting device, a first telescopic groove is formed in the position, at the lower end of the first motor groove, in the distance adjusting device, a first telescopic rod is connected to the lower end of the distance adjusting device, and a hot riveting welding device is rotationally connected to the lower end of the first telescopic rod; a first stabilizing arm is rotationally connected to one side of the hot riveting welding device, an angle adjusting device is connected to one side of the distance adjusting device, a second telescopic groove is formed in the position, at the lower end of a second motor groove, in the angle adjusting device, and a second telescopic rod is connected to the lower end of the angle adjusting device; and one side of the angle adjusting device is connected with a second stabilizing arm.

The utility model relates to a kind of angle adjustable snow machine, with movable base, multiple rollers are equipped on movable base, snow making cylinder is equipped on movable base, the snow spraying end of snow making cylinder is equipped with water ring and multiple spray pipes, the snow spraying end of snow making cylinder is further equipped with air ring and multiple, air pipe, the tail end of snow making cylinder is equipped with air blower, adjusting assembly is equipped on movable base, adjusting assembly includes drive motor, rotating platform and rotating support, driving gear is fixedly arranged on connecting shaft, adjusting rotating rod is equipped on rotating platform, driven gear is equipped on the lower end of adjusting rotating rod, thread part is equipped on adjusting rotating rod, limit block is equipped on the top of adjusting rotating rod, transmission block is sleeved on thread part, threaded hole is equipped on transmission block, link is equipped on the side of transmission block, side edge sliding slot is equipped on the side wall of snow making cylinder, side edge sliding block is slidably arranged in side edge sliding slot, link is rotatably connected on side edge sliding block.The utility model structure is ingenious, convenient and practical.

The invention relates to the technical field of engineering surveying and mapping, and discloses a constructional engineering cost on-site surveying and mapping device based on an intelligent sensor, comprising a connecting block, a mounting rack mounted on the connecting block, a laser displacement sensor mounted on the mounting rack, and a support rotatably connected to the circumferential surface of the connecting block. Movement of the supports can drive the supporting legs to move synchronously, angle adjustment of the multiple supports can be controlled synchronously, angle adjustment of the supports can be achieved, it is ensured that surveying and mapping personnel can adjust the opening angles of the multiple supports to be the same angle, the situation that in the follow-up surveying and mapping process, the whole device topples over can be avoided, and the surveying and mapping efficiency is improved. The surveying and mapping accuracy can be improved, the laser displacement sensor is protected from being damaged by the field environment, the service life of equipment is prolonged, the consistency of surveying and mapping data is guaranteed, the reliability of the cost result is improved, and the surveying and mapping accuracy and stability of the device can be guaranteed.

The utility model belongs to the field of digital ultrasonic flaw detector, concretely relates to a digital ultrasonic flaw detector for pressure vessel nondestructive testing, including instrument, the upper end of instrument is equipped with the turnover lid through bearing, the outside of instrument is provided with angle positioning mechanism, the back of instrument is fixedly installed with a plurality of even distribution's fixed plate, the back upper portion of fixed plate is fixedly installed with fixed column, the outside of fixed plate is connected with screw frame slidingly, the outside of screw frame is fixedly installed with movable column, the outside of fixed plate is fixedly installed with mount. The utility model adds fixed plate, fixed column and movable column and other structures on the instrument, when needing to store data line, can wind data line outside fixed column and movable column simultaneously, then carries out the tension of data line after winding through the thread cooperation between screw rod and screw frame, can make data line more convenient to store.

The utility model belongs to display technical field, specifically discloses a kind of double gear shaft formula screen shaft and double screen display, double gear shaft formula screen shaft includes shell and two interval settings gear shaft, the axle end of each gear shaft reaches to shell inside and is rotatably connected with shell, the other axle end of each gear shaft reaches to shell outside and forms connecting end, wheel seat is commonly set on two gear shafts, wheel seat is located in shell, cylindrical gear is rotatably installed in wheel seat, cylindrical gear is located between two gear shafts and is engaged with the gear section of two gear shafts.The screen shaft of the utility model is not only compact, stable, high-precision, so that screen shaft can realize accurate angle adjustment, and have enough carrying capacity.The double screen display includes support plate and two screens, support plate is located between two screens, the both ends of support plate are rotatably connected with two screens by double gear shaft formula screen shaft, realize flexible, stable, accurate relative motion between screen.

The utility model relates to the technical field of dust removal treatment, and discloses mine dust treatment equipment which comprises a treatment equipment base body, a mechanical angle adjusting device is installed above the treatment equipment base body, and a crank device is installed above one side of the mechanical angle adjusting device. When the device is used, efficient and labor-saving operation can be conveniently achieved through a small gear transmission device, a medium gear transmission device and a large gear transmission device which are internally designed through an arranged mechanical angle adjusting device, the device is of a pure mechanical structure, a small gear is driven through a crank, and the small gear is driven to rotate through a rotating shaft. By means of the multi-stage gear meshing design, the operation torque is remarkably reduced, the adjusting process is easier and more labor-saving, the whole device does not need to be driven by electricity completely, and the angle adjusting device is particularly suitable for being reliably used under the environmental conditions of the open mining industry and the like. The device has the outstanding advantages of simple structure, convenience in maintenance, high adaptability and the like.

The water gun comprises a base, an L-shaped support is arranged on the base, a connecting shaft is rotationally installed in the vertical section of the L-shaped support, a worm gear is arranged at one end of the connecting shaft and located on the outer side of the L-shaped support, two lug plates are arranged on the outer side of the L-shaped support, and the same worm is rotationally installed between the two lug plates; a worm drives a worm gear to rotate, an arc-shaped sliding rail does circular motion through connection of a connecting shaft, a square column drives a first cylinder and a second cylinder to do reciprocating swing through connection of a supporting shaft and connection of a connecting rod, and therefore a water gun head connected to a U-shaped connecting piece is driven to achieve angle adjustment in the horizontal direction; compared with the prior art, the stability of the water gun head after angle adjustment in the horizontal direction is guaranteed through the self-locking performance between the worm and the worm gear, reciprocating motion of the water gun head in the horizontal direction is achieved through one-way rotation of the worm, and labor is saved through manual operation.

The present invention provides an engine suspension bracket detection device, which relates to the technical field of suspension bracket detection, and comprises: a detection platform, wherein the outer surface of the detection platform is fixedly connected with three side pillars, an upper cover frame is installed at the upper end of the side pillar, and three visual detection cameras are arranged on the lower surface of the upper cover frame. The detection device is equipped with three visual detection cameras, and the three suspension brackets at the bottom of the upper cover frame are detected from three different positions respectively. The workpiece detection carrier plate and the suspension bracket are driven to rotate clockwise by a servo motor and a rotating reversing frame. In this process, the workpiece detection carrier plates at different positions are made to have different inclination angles through the cooperation of the carrier plate directional roller and the directional rolling track. The surfaces of the suspension bracket in different directions are visually detected by the visual detection camera, and there is no need for manual reversing or adjustment of the suspension bracket, so that the angle adjustment of the suspension bracket is more efficient and smooth.

The invention relates to the technical field of additive manufacturing equipment. The closed type environment-friendly charging and mixing device for ceramic 3D printing large-scale production comprises a base, a stirring bin, a stirring device and a top cover, the top cover and the stirring bin are closed to form a closed space, and the requirement for environment-friendly production is met. The stirring device is composed of a driving device, a movable device and an adjusting device, and the driving device, the movable device and the adjusting device cooperatively construct a multi-dimensional three-dimensional stirring flow field. The driving device provides double transmission power, the movable device achieves accurate power transmission and stirring track fine adjustment, and the adjusting device can flexibly adjust the stirring posture and the material contact range. Through multi-component linkage, ceramic powder is effectively prevented from sinking to the bottom and caking, the mixing requirements of materials with different viscosities are met, the material mixing uniformity and the production continuity are improved, the maintenance cost and the material waste are reduced, the structure is stable and reliable, the device is suitable for ceramic 3D printing large-scale production, and good practicability and popularization value are achieved.

The utility model relates to the technical field of screen printing machines, in particular to an oblique arm type screen printing machine convenient to adjust, which comprises a screen printing machine main body, a support arm, a mounting plate, telescopic devices and an adjusting component, the upper end face of the screen printing machine main body is hinged with the support arm, the mounting plate is connected onto the support arm, and the telescopic devices which are uniformly distributed at equal intervals are connected onto the mounting plate. The telescopic end of the telescopic device is used for being connected with the adjusting assembly, the adjusting assembly comprises a height adjusting assembly and an angle adjusting assembly, the height adjusting assembly is connected to the telescopic end of the telescopic device, and the angle adjusting assembly is connected to the height adjusting assembly. According to the utility model, the height adjusting assembly can adjust the height of the scraper or the ink reclaiming blade in the use state, the angle adjusting assembly can adjust the angle of the scraper or the ink reclaiming blade by replacing components with different angles in the use state, and the whole scraper or the ink reclaiming blade is in contact with the components for angle adjustment. And the angle adjustment of the two is more stable, and the problem that the printing quality is affected is avoided.

The invention provides a pre-embedded frameless anti-dazzle spotlight, which relates to the technical field of lighting lamps and comprises a pre-embedded frame body, a lamp holder is rotatably arranged in the pre-embedded frame body, a heat dissipation body is arranged on the lamp holder, and a light source assembly is arranged in the heat dissipation body; an anti-dazzle cup is arranged in the lamp holder, and the light source assembly is located above the anti-dazzle cup and used corresponding to the anti-dazzle cup. At least three clamping and locking components are arranged on the embedded frame body, an included angle alpha is formed between the connecting lines of the adjacent clamping and locking components and the center of the embedded frame body, and the value of alpha is 90-120 degrees; the pre-embedded frame body comprises an outer frame piece, the outer frame piece is provided with an embedding table which protrudes upwards and is used for being embedded into an opening in a ceiling, the diameter of the outer frame piece is larger than that of the embedding table, and the outer frame piece is further provided with a ceiling connecting face which transversely extends outwards and protrudes out of the embedding table; and the clamping and locking part is connected to the embedding table. The ceiling fixing device has the beneficial effects that the ceiling is fixed in the mode that the clamping and locking component clamps the ceiling up and down, and the clamping effect is good; rotation is smooth, and heat dissipation performance is good.

The utility model is suitable for the technical field of shock absorber connecting shafts, and provides an automobile shock absorber connecting shaft which comprises a shock absorber connecting shaft body. The fixed connecting end is integrally formed at one end of the shock absorber connecting shaft body; the limiting cylinder is integrally formed at the other end of the shock absorber connecting shaft body; the limiting disc is arranged in the limiting cylinder; the supporting shaft is welded to the central position of the outer wall of one side of the limiting disc; the movable connecting end is integrally formed at one end of the supporting shaft; the first butt-joint plate and the second butt-joint plate are welded to the outer side wall of the limiting cylinder; the supporting shaft at one end of the movable connecting end is stored into a part of the limiting cylinder, the length of the damper connecting shaft body can be shortened, and therefore the problem that rotation of the movable connecting end interferes with an installation position during angle adjustment is avoided, and smooth angle adjustment of the movable connecting end is guaranteed; and the movable connecting end can be conveniently butted with a mounting position after angle adjustment.

According to the lens angle adjusting method and device, a mounting flange of a lens abuts against a limiting piece, the limiting piece comprises at least two cylindrical rotating pieces which are tangent to the circular-arc-shaped outer edge of the mounting flange, and the rotating center position of the lens is determined through the rotating pieces and the circular-arc-shaped outer edge. The mounting flange is controlled to rotate through the adjusting piece, in the rotating process of the mounting flange, rolling friction is generated between the arc-shaped outer edge of the mounting flange and the rotating piece, and when the mounting flange rotates to a proper angle, the mounting flange is fixed to the base. The cylindrical limiting piece is tangent to the arc-shaped outer edge of the mounting flange, the rotation center position of the lens is determined, the rotation center does not move in the exposure lens rotation process, and the phenomenon that the exposure lens is blocked and cannot rotate is avoided. The angle adjusting precision and efficiency of the exposure lens are improved.