Center positioning clamp for polishing optical lens

Abstract

The invention discloses a center positioning clamp for optical lens polishing, and relates to the technical field of optical lens machining, the center positioning clamp comprises an example workbench, a controller, an electric control air cylinder and a micro servo motor, the electric control air cylinder and the micro servo motor are arranged above the example workbench, and the electric control air cylinder and the micro servo motor are both controllably connected to the controller; through the arrangement of an arc-shaped plate and a wiping layer, grinding fluid and lens waste particles adhering to the clamping blocks in the clamping and grinding process are wiped, and therefore it is guaranteed that the clamping faces of the clamping blocks are dry and clean, and the clamping stability of the next time is guaranteed; in addition, the risk that the lens is damaged during processing due to the fact that uneven particles adhere to the surface of the clamping tool can be avoided, the loss rate of lens processing is further reduced, meanwhile, the workload of manually cleaning the clamping tool is reduced, and in addition, through the arrangement that the wiping layer ascends to automatically replace rolling, the production efficiency is improved. And the wiping layer is further ensured to be in a clean state during wiping each time.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lens processing, and particularly to a central positioning fixture for optical lens grinding. Background Art

[0002] A central positioning fixture for optical lens grinding generally refers to a fixture device used to ensure the accurate positioning and fixation of optical devices (such as lenses and lens elements) during the optical processing. Such fixtures are usually designed to ensure the alignment of the central position and axis of the lens with the processing equipment during processes such as lens grinding and polishing, so as to ensure that the processed lens has precise shape, surface, and optical properties.

[0003] In the field of optical lens element processing, traditional clamping blocks are usually directly exposed without any masking protection. This easily leads to the adhesion of dust and impurities on their surfaces when not in use, increasing the workload of cleaning for the staff and the risk of accidental contact with the power supply causing personal clamping injuries. During the grinding process, glass slag particles and grinding fluid generated by the lens element will adhere to the clamping block. If the clamping surface is not cleaned in time, the residual glass slag will affect the clamping stability and also damage the edge of the next clamped lens element, thereby increasing the processing loss rate.

[0004] In addition, since grinding fluid is usually added during the grinding process of the lens element, and liquid molecules have surface tension, an adsorption force is generated between the bottom of the lens element and the equipment surface. Especially during the grinding process, the grinding fluid will mix with the grinding waste to form a viscous grinding paste, which is more likely to cause an adsorption phenomenon between the bottom surface of the lens element and the equipment surface, making it difficult to quickly and accurately clamp and handle. This not only affects the processing efficiency but also may damage the surface of the lens element, thus affecting the processing quality and service life.

[0005] Therefore, a central positioning fixture for optical lens grinding is proposed to solve the above problems. Summary of the Invention

[0006] To achieve the above object, the present invention provides the following technical solution: A central positioning fixture for optical lens grinding, comprising: an exemplary workbench, a controller, an electric control cylinder, and a micro servo motor disposed above the exemplary workbench, and the electric control cylinder and the micro servo motor are both controllably connected to the controller;

[0007] A cleaning and protection mechanism for cleaning the fixture to ensure clamping stability and masking dust is provided on the exemplary workbench;

[0008] A jacking mechanism for assisting in lens positioning and lifting the lens for easy picking is provided on the exemplary workbench.

[0009] Preferably, the cleaning and protection mechanism includes a placement cavity table detachably connected to the upper surface of the example workbench. The micro servo motor is fixedly installed at the center inside the placement cavity table. The upper surface of the placement cavity table is uniformly penetrated with centripetal grooves. The upper output shaft of the micro servo motor is coaxially and fixedly connected with an adjustable distance disk. The surface of the adjustable distance disk is uniformly provided with adjustable distance grooves, and the adjustable distance grooves are distributed in a centripetal spiral shape. Four sliding shafts are uniformly slidably connected inside the outer ring of the adjustable distance grooves. The upper ends of the four sliding shafts are all slidably connected inside the centripetal grooves. The upper ends of the four sliding shafts are all fixedly connected with clamping blocks. The upper output shaft of the electric control cylinder is fixedly connected with an auxiliary rod. Dust covers are sleeved outside the clamping blocks. The dust covers are fixedly connected through an auxiliary connecting ring. One of the dust covers is fixedly connected with the upper end of the auxiliary rod.

[0010] Preferably, the surfaces of the clamping blocks on the side close to the center of the placement cavity table are all arc concave surfaces, and an anti-slip layer is attached to the surface of the arc concave surface. The anti-slip layer is a soft rubber pad with anti-slip patterns.

[0011] Preferably, the cleaning and protection mechanism further includes a connecting rod fixedly connected to the inner wall of the dust cover. One end of the connecting rod close to the clamping block is fixedly connected with an arc-shaped plate. The surface of the arc-shaped plate close to the clamping block is an arc convex surface. When the arc-shaped plate moves upward, its arc convex surface fits with the arc concave surface of the clamping block. A tape gear unwinding roller and a tape gear winding roller are respectively rotatably connected to the inner wall of the dust cover. The tape gear unwinding roller is composed of a first tooth disk on the side close to the inner wall of the dust cover and a first roller coaxially and fixedly connected to the first tooth disk. The tape gear winding roller is composed of a second tooth disk on the side close to the inner wall of the dust cover and a second roller coaxially and fixedly connected to the second tooth disk. The first tooth disk in the tape gear unwinding roller meshes with the second tooth disk in the tape gear winding roller. A wiping layer is wound around the outer circumferential surface of the first roller in the tape gear unwinding roller. The wiping layer is made of fiber cloth. One end of the wiping layer away from the tape gear unwinding roller is sequentially wound around the outer walls of the arc-shaped plate and the second roller in the tape gear winding roller, and the part of the wiping layer wound around the outer wall of the second roller of the tape gear winding roller is fixedly connected to the second roller. A ratchet disk is rotatably connected through the outer wall of one side of the dust cover. The ratchet disk is coaxially and fixedly connected with the first roller in the tape gear unwinding roller. The upper surface of the placement cavity table is fixedly connected with a fixing plate. The upper end of the fixing plate is rotatably connected with a torsion spring pawl.

[0012] Preferably, the torsion spring pawl is located in the rising path of the ratchet disk, and the ratchet disk can engage with the torsion spring pawl during the rising process and cause the ratchet disk to rotate.

[0013] Preferably, a notch is formed through the other surface of the dust cover, and a visual plate is rotatably connected to the notch of the dust cover in a matching manner. The visual plate is made of transparent acrylic material.

[0014] Preferably, the jacking mechanism includes a central shaft fixedly connected to the upper surface of the distance adjusting disk coaxially. An external thread is provided on the outer wall above the central shaft. A jacking shaft is sleeved on the outer wall above the central shaft. A threaded hole adapted to the external thread is formed in the center of the inner part of the jacking shaft. A receiving hole is formed through the center of the placing cavity table, and the outer wall of the jacking shaft is slidably connected to the receiving hole.

[0015] Preferably, the outer surface of the jacking shaft is coated with an anti-slip coating, and the color of the anti-slip coating is red. There is a gap between the upper end surface of the jacking shaft at the initial position and the upper surface of the placing cavity table.

[0016] Compared with the prior art, the present invention provides a central positioning fixture for optical lens grinding, having the following beneficial effects:

[0017] 1. Through the setting of the dust cover, when the clamping block is not in use, it can be shielded from dust, and at the same time, it can also be protected to prevent the clamping block from being damaged by collision, and to prevent personnel from being injured by accidentally touching the power supply. When in use, the electric control cylinder drives the dust cover and its internal components to move upward, so as not to hinder the clamping of the clamping block. After the clamping block completes clamping, the dust cover will move downward to continue to protect the clamping block from dust.

[0018] 2. Through the setting of the arc plate and the wiping layer, the grinding fluid and lens waste particles adhered during the clamping and grinding process of the clamping block are wiped, so as to ensure the dryness and cleanliness of the clamping surface of the clamping block, not only ensuring the stability of the next clamping, but also avoiding the risk of lens processing damage caused by uneven particles adhering to the surface of the clamping tool, further reducing the loss rate of lens processing, and at the same time reducing the workload of manually cleaning the clamping tool. Moreover, through the setting of the automatic replacement and winding of the wiping layer rising in this solution, it further ensures that the wiping layer is in a clean state every time it wipes.

[0019] 3. Through the setting of the red anti-slip coating on the surface of the jacking shaft, it is convenient for the staff to quickly locate the placement position of the processed lens. After the grinding process is completed, the jacking shaft will vertically lift in the central receiving hole of the placing cavity table, so as to push the processed lens to rise from the surface of the placing cavity table and keep a certain distance from the surface of the placing cavity table, thereby eliminating the adsorption force between the bottom end of the lens stained with grinding fluid and the contact surface of the placing cavity table, and thus facilitating the clamping by manual or mechanical equipment. Description of the Drawings

[0020] Figure 1It is a main perspective structural diagram of the present invention;

[0021] Figure 2 It is a three-dimensional structural diagram of the interior of the cavity platform in the present invention;

[0022] Figure 3 It is a three-dimensional structural diagram of the present invention in a cutaway state where the cavity platform and the ejection shaft are placed;

[0023] Figure 4 For the present invention Figure 1 A partial enlarged three-dimensional structure diagram at the center A;

[0024] Figure 5 For the present invention Figure 1 A partial enlarged three-dimensional structure diagram at B in the middle;

[0025] Figure 6 It is a three-dimensional structural diagram of the present invention when the visual panel is in an open state;

[0026] Figure 7 It is a three-dimensional internal structure diagram of the dust cover in the present invention.

[0027] In the figure:

[0028] 1. Sample workbench; 101. Electric cylinder; 102. Micro servo motor;

[0029] 201, cavity placement table; 202, centripetal groove; 203, pitch adjustment disk; 204, pitch adjustment groove; 205, sliding shaft; 206, clamping block; 207, auxiliary rod; 208, dust cover; 209, connecting rod; 210, arc plate; 211, unwinding roller with gear; 212, winding roller with gear; 213, wiping layer; 214, ratchet disk; 215, fixing plate; 216, torsion spring ratchet; 217, visual plate; 218, auxiliary connecting ring;

[0030] 301, center axis; 302, external thread; 303, push shaft; 304, threaded hole. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0033] Embodiments of the present invention

[0034] Please refer toFigures 1 to 7 As shown in:

[0035] To solve the problems mentioned in the technical solution, an embodiment of the present application provides a central positioning fixture for optical lens grinding, including: an example workbench 1, a controller, an electric control cylinder 101 and a micro servo motor 102 arranged above the example workbench 1. The electric control cylinder 101 and the micro servo motor 102 are both controllably connected to the controller;

[0036] A cleaning and protection mechanism for cleaning the fixture to ensure clamping stability and shielding dust is arranged on the example workbench 1;

[0037] The cleaning and protection mechanism includes a placement cavity table 201 detachably connected to the upper surface of the example workbench 1. The micro servo motor 102 is fixedly installed at the center inside the placement cavity table 201. Centripetal grooves 202 are uniformly formed through the upper surface of the placement cavity table 201. A distance adjustment disk 203 is coaxially and fixedly connected to the upper output shaft of the micro servo motor 102. Distance adjustment grooves 204 are uniformly formed on the surface of the distance adjustment disk 203, and the distance adjustment grooves 204 are distributed in a centripetal spiral shape. Four sliding shafts 205 are uniformly slidably connected to the inner part of the outer ring of the distance adjustment grooves 204. The upper ends of the four sliding shafts 205 are all slidably connected to the inside of the centripetal grooves 202. Clamping blocks 206 are fixedly connected to the upper ends of the four sliding shafts 205. An auxiliary rod 207 is fixedly connected to the upper output shaft of the electric control cylinder 101. Dust-proof covers 208 are sleeved outside the clamping blocks 206. The dust-proof covers 208 are fixedly connected through an auxiliary connection ring 218. One of the dust-proof covers 208 is fixedly connected to the upper end of the auxiliary rod 207;

[0038] The cleaning and protection mechanism further includes a connecting rod 209 fixedly connected to the inner wall of the dust cover 208. One end of the connecting rod 209 close to the clamping block 206 is fixedly connected with an arc-shaped plate 210. The surface of the arc-shaped plate 210 close to the clamping block 206 is an arc convex surface, and when the arc-shaped plate 210 moves upward, its arc convex surface fits with the arc concave surface of the clamping block 206. A gear-driven unwinding roller 211 and a gear-driven winding roller 212 are respectively rotatably connected to the inner wall of the dust cover 208. The gear-driven unwinding roller 211 is composed of a first tooth disc on the side close to the inner wall of the dust cover 208 and a first roller coaxially and fixedly connected to the first tooth disc. The gear-driven winding roller 212 is composed of a second tooth disc on the side close to the inner wall of the dust cover 208 and a second roller coaxially and fixedly connected to the second tooth disc. The first tooth disc in the gear-driven unwinding roller 211 meshes with the second tooth disc in the gear-driven winding roller 212. A wiping layer 213 is wound around the outer circumferential surface of the first roller in the gear-driven unwinding roller 211. The wiping layer 213 is made of fiber cloth. One end of the wiping layer 213 away from the gear-driven unwinding roller 211 is sequentially wound around the outer walls of the arc-shaped plate 210 and the second roller in the gear-driven winding roller 212, and the part of the wiping layer 213 wound around the outer wall of the second roller of the gear-driven winding roller 212 is fixedly connected to the second roller. A ratchet disc 214 is rotatably connected through the outer wall of one side of the dust cover 208. The ratchet disc 214 is coaxially and fixedly connected to the first roller in the gear-driven unwinding roller 211. A fixing plate 215 is fixedly connected to the upper surface of the placing cavity table 201. A torsion spring pawl 216 is rotatably connected to the upper end of the fixing plate 215.

[0039] Among them:

[0040] The surfaces of the clamping blocks 206 on the side close to the center of the placing cavity table 201 are all arc concave surfaces, and an anti-slip layer is attached to the surface of the arc concave surfaces. The anti-slip layer is a soft rubber pad with anti-slip patterns;

[0041] The torsion spring pawl 216 is located in the rising path of the ratchet disc 214, and the ratchet disc 214 can be engaged with the torsion spring pawl 216 during the rising process to cause the ratchet disc 214 to rotate;

[0042] A notch is formed through the other surface of the dust cover 208, and a viewing plate 217 is rotatably connected to the notch formed in the dust cover 208. The viewing plate 217 is made of transparent acrylic material.

[0043] Further embodiments: Please refer to Figures 1 to 3 as shown:

[0044] A jacking mechanism for assisting in positioning the lens and lifting the lens for taking is provided on the example workbench 1;

[0045] The lifting mechanism includes a central shaft 301 coaxially and fixedly connected to the upper surface of the distance adjusting disc 203. An external thread 302 is provided on the outer wall above the central shaft 301. A push shaft 303 is sleeved on the outer wall above the central shaft 301. A threaded hole 304 adapted to the external thread 302 is opened at the inner center of the push shaft 303. A receiving hole is penetrated through the center of the placement cavity table 201, and the outer wall of the push shaft 303 is slidably connected to the receiving hole.

[0046] Wherein:

[0047] The distance that the external thread 302 rotates and lifts in the threaded hole 304 is the distance between the upper surface of the push shaft 303 and the upper surface of the placement cavity table 201 in the initial state;

[0048] The outer surface of the push shaft 303 is coated with an anti-slip coating, and the color of the anti-slip coating is red. There is a gap between the upper end surface of the push shaft 303 at the initial position and the upper surface of the placement cavity table 201.

[0049] The working principle of all the contents in the above embodiments is as follows:

[0050] In the initial state: The wiping layer 213 that fits the convex arc surface of the arc-shaped plate 210 is in a clean and unwiped state, and there is a gap between the upper surface of the push shaft 303 and the upper surface of the placement cavity table 201.

[0051] The following is the working process of the cleaning and protecting mechanism for cleaning the fixture to ensure clamping stability and shield dust at the same time:

[0052] First, when the staff needs to process the lens to be polished, reference can be made to Figure 1As shown, the staff first fixes the cavity table 201 on the upper surface of the example workbench 1, and then uses the push shaft 303 coated with a red anti-skid coating as a reference to place the lens lens to be polished horizontally at the center of the surface of the push shaft 303. Then the staff can start the electric control cylinder 101 to lift through the controller, thereby driving one of the dust covers 208 to rise through the auxiliary rod 207, and at the same time driving the arc plate 210 and the wiping layer 213 to move up to fit the arc concave surface of the clamping block 206, so that the clamping surface of the clamping block 206 is wiped and cleaned before clamping. Since the dust covers 208 are connected by the auxiliary connecting ring 218, all the dust covers 208 will be synchronously moved up to above the top of the clamping block 206, and the ratchet disc 214 will be driven to move up synchronously during the upward movement of the dust cover 208. The torsion spring pawl 216 is located in the rising path of the ratchet disk 214, and the ratchet disk 214 can mesh with the torsion spring pawl 216 during its rising process and cause the ratchet disk 214 to rotate, thereby driving the gear unwinding roller 211 to rotate synchronously, and driving the meshing gear winding roller 212 to rotate synchronously in the opposite direction, so that the wiping layer 213 slides against the arc convex surface of the arc plate 210 and is wound around the gear winding roller 212, so as to replace and wind up the wiping layer 213 wiped on the arc convex surface of the arc plate 210, thereby ensuring that it is in a clean state when wiped next time. In addition, since the visual panel 217 is a transparent and visible setting, the staff can observe the use of the wiping layer 213 in time. When the wiping layer 213 is used up, the visual panel 217 can be manually opened to remove and replace the wiping layer 213 in the dust cover 208;

[0053] Further, after the electric control cylinder 101 finishes lifting, the electric control cylinder 101 will remain in this state. At the same time, the dust cover 208 and its internal components will also remain above the top of the clamping block 206. At this time, the controller will continue to start the micro servo motor 102 to rotate counterclockwise and drive the central shaft 301 to rotate synchronously. Since the distance that the external thread 302 rotates and lifts in the threaded hole 304 is the distance between the upper surface of the push shaft 303 and the upper surface of the placement cavity table 201 in the initial state, under the rotation of the central shaft 301 and the external thread 302, the push shaft 303 will vertically move downward in the central receiving hole of the placement cavity table 201 until the upper surface of the push shaft 303 is flush with the upper surface of the placement cavity table 201. At this time, the bottom end of the lens will also be flush with the placement cavity table 201. At the same time, the rotation of the micro servo motor 102 will drive the distance adjustment disc 203 to rotate synchronously. Since the bottom ends of the sliding shafts 205 all slide in the distance adjustment grooves 204, and the upper ends of the sliding shafts 205 are horizontally restricted and slide in the centripetal grooves 202, when the distance adjustment disc 203 rotates, the sliding shafts 205 located inside the outer ring of the distance adjustment groove 204 are all squeezed by the distance adjustment groove 204, thereby guiding the plurality of sliding shafts 205 to slide simultaneously toward the center of the placement cavity table 201 in the centripetal groove 202, and then driving the clamping block 206 to move centripetally synchronously to clamp the lens at the center. At this time, the micro servo motor 102 will stop rotating, and the clamping block 206 will maintain the clamping of the processed lens until the grinding process is completed;

[0054] Furthermore, after the processed lens clamped by the clamping block 206 is polished, the controller will continue to control the electric control cylinder 101 to start, so that the electric control cylinder 101 moves downward to reset and drives the moving parts such as the dust cover 208 to move downward synchronously. And during the downward movement of the ratchet disc 214, it will not engage with the torsion spring pawl 216, so the ratchet disc 214 will not rotate during the downward movement. The dust cover 208 drives the arc plate 210 and the wiped layer 213 in a clean state after replacement to move downward along the arc concave surface of the clamping block 206 to wipe the grinding particles adhered to the clamping surface of the clamping block 206, so as to keep the clamping surface of the clamping block 206 clean, and further ensure the clamping stability of the clamping block 206;

[0055] Therefore, through the setting of the dust cover 208, it shields and dust-proofs the clamping block 206 when it is not in use, and at the same time can also protect it to avoid the clamping block 206 being damaged by collision, and avoid personnel being injured by accidentally touching the power supply. When in use, the electric control cylinder 101 drives the dust cover 208 and its internal components to move upward, so as not to hinder the clamping of the clamping block 206. And when the clamping block 206 finishes clamping, the dust cover 208 will move downward to continue to dust-proof and protect the clamping block 206;

[0056] Moreover, through the arrangement of the arc-shaped plate 210 and the wiping layer 213, the grinding fluid and lens waste particles adhered during the grinding process clamped by the clamping block 206 are wiped, thereby ensuring the dryness and cleanliness of the clamping surface of the clamping block 206. This not only ensures the stability of the next clamping but also avoids the risk of lens processing damage caused by uneven particles adhering to the surface of the clamping tool, further reducing the loss rate of lens processing. At the same time, it also reduces the workload of manually cleaning the clamping tool. And through the setting of the automatic replacement and winding of the wiping layer 213 in this solution, it further ensures that the wiping layer 213 is in a clean state every time it wipes;

[0057] Please refer to the above working process Figures 1 to 7 。

[0058] The following is the working process of the jacking mechanism for assisting in lens positioning and lifting the lens for taking:

[0059] During use, when the grinding of the processed lens clamped by the clamping block 206 is completed, the micro servo motor 102 will be started again by the controller and rotate in the reverse direction to reset, thereby driving the distance adjustment disc 203, the clamping block 206, and the push shaft 303 to move synchronously in the reverse direction to reset. During the reset process of the push shaft 303, the processed lens placed at the center of the surface of the placement cavity table 201 will be jacked up, so that the lens is separated from the surface of the placement cavity table 201 with a gap, which is convenient for staff or mechanical devices to take;

[0060] Therefore, through the setting of the red anti-slip coating on the surface of the push shaft 303, it is convenient for staff to quickly position the placement position of the processed lens. After the grinding process is completed, the push shaft 303 will vertically jack up in the central accommodation hole of the placement cavity table 201, so as to push up the processed lens from the surface of the placement cavity table 201 and keep a certain distance from the surface of the placement cavity table 201, thereby eliminating the adsorption force between the bottom end of the lens stained with grinding fluid and the contact surface of the placement cavity table 201, which is convenient for manual or mechanical equipment to clamp.

[0061] Please refer to the above working process Figures 1 to 3 。

[0062] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0063] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A center positioning fixture for polishing an optical lens, comprising: An example workbench (1) and a controller, and an electric-controlled cylinder (101) and a micro-servo motor (102) arranged above the example workbench (1), characterized in that the electric-controlled cylinder (101) and the micro-servo motor (102) are both controllably connected to the controller; The exemplary workbench (1) is provided with a cleaning and protection mechanism for cleaning the clamp to ensure clamping stability and shield against dust; The exemplary workbench (1) is provided with a lifting mechanism for assisting in positioning the lens and lifting the lens for easy picking.

2. The center positioning fixture for optical lens polishing according to claim 1, characterized in that: The cleaning and protection mechanism comprises a cavity placement table (201) detachably connected to the upper surface of the example workbench (1); the micro servo motor (102) is fixedly installed at the inner center of the cavity placement table (201); the upper surface of the cavity placement table (201) is evenly penetrated with centripetal grooves (202); the upper output shaft of the micro servo motor (102) is coaxially fixedly connected with a pitch adjustment disk (203); the surface of the pitch adjustment disk (203) is evenly provided with pitch adjustment grooves (204), and the pitch adjustment grooves (204) are distributed in a centripetal spiral shape; the inner part of the outer circle of the pitch adjustment grooves (204) is evenly Four sliding shafts (205) are evenly slidably connected, the upper ends of the four sliding shafts (205) are slidably connected to the inside of the centripetal groove (202), the upper ends of the four sliding shafts (205) are fixedly connected to a clamping block (206), the upper output shaft of the electric control cylinder (101) is fixedly connected to an auxiliary rod (207), the outside of the clamping block (206) is sleeved with a dust cover (208), the dust covers (208) are fixedly connected to each other through an auxiliary connecting ring (218), and one of the dust covers (208) is fixedly connected to the upper end of the auxiliary rod (207).

3. The center positioning fixture for polishing an optical lens according to claim 2, characterized in that: The surface of one side of the clamping block (206) close to the center of the cavity platform (201) is an arc concave surface, and the surface of the arc concave surface is adhered with an anti-slip layer.

4. The center positioning fixture for polishing an optical lens according to claim 2, characterized in that: The cleaning and protection mechanism also includes a connecting rod (209) fixedly connected to the inner wall of the dust cover (208), and an arc plate (210) is fixedly connected to one end of the connecting rod (209) close to the clamping block (206), and a side of the arc plate (210) close to the clamping block (206) is an arc convex surface, and when the arc plate (210) moves upward, its arc convex surface fits with the arc concave surface of the clamping block (206), and is in contact with the dust cover (208). The inner wall is rotatably connected to a geared unwinding roller (211) and a geared winding roller (212), the geared unwinding roller (211) is composed of a toothed disc 1 near the inner wall of the dust cover (208) and a rotating roller 1 coaxially fixedly connected to the toothed disc 1, the geared winding roller (212) is composed of a toothed disc 2 near the inner wall of the dust cover (208) and a rotating roller 2 coaxially fixedly connected to the toothed disc 2, the geared unwinding roller (211) is composed of a toothed disc 2 near the inner wall of the dust cover (208) and a rotating roller 2 coaxially fixedly connected to the toothed disc 2. The toothed disc 1 of the geared winding roller (212) is meshed with the toothed disc 2 of the geared winding roller (212); the outer circumferential surface of the rotating roller 1 of the geared unwinding roller (211) is wound with a wiping layer (213); the wiping layer (213) is made of fiber cloth; one end of the wiping layer (213) away from the geared unwinding roller (211) is respectively wound around the arc plate (210) and the outer wall of the rotating roller 2 of the geared winding roller (212); and the wiping layer (213) is wound around the geared unwinding roller (211) Part of the outer wall of the gear winding roller (212) is fixedly connected to the second roller, a ratchet disc (214) is rotatably connected to the outer wall of one side of the dust cover (208), the ratchet disc (214) is coaxially fixedly connected to the first roller in the gear unwinding roller (211), the upper surface of the cavity placement platform (201) is fixedly connected to a fixing plate (215), and the upper end of the fixing plate (215) is rotatably connected to a torsion spring pawl (216).

5. The center positioning fixture for polishing an optical lens according to claim 4, characterized in that: The torsion spring pawl (216) is located in the ascending path of the ratchet disc (214), and can mesh with the torsion spring pawl (216) during the ascending process of the ratchet disc (214) to cause the ratchet disc (214) to rotate.

6. The center positioning fixture for polishing an optical lens according to claim 4, characterized in that: A notch is formed through the other side surface of the dust cover (208), and a visual panel (217) is rotatably connected to the notch of the dust cover (208), and the visual panel (217) is made of a transparent acrylic material.

7. The center positioning fixture for polishing an optical lens according to claim 2, characterized in that: The lifting mechanism comprises a central shaft (301) coaxially fixedly connected to the upper surface of the distance adjusting plate (203); an outer wall above the central shaft (301) is provided with an external thread (302); a pushing shaft (303) is sleeved on the outer wall above the central shaft (301); a threaded hole (304) matching the external thread (302) is provided at the inner center of the pushing shaft (303); a receiving hole is provided through the center of the circle of the cavity placement platform (201), and the outer wall of the pushing shaft (303) is slidably connected to the receiving hole.

8. The center positioning fixture for polishing an optical lens according to claim 7, characterized in that: The outer surface of the push shaft (303) is coated with an anti-slip coating, and a gap is left between the upper end surface of the push shaft (303) at the initial position and the upper surface of the cavity platform (201) on which the cavity platform (201) is placed.

Images