A grinding head fixture for polishing the 3D mobile phone back cover glass

Abstract

The present invention discloses a grinding head fixture for polishing the rear cover glass of a 3D mobile phone, which relates to the technical field of glass polishing. It includes a connecting shaft and a grinding head body. A connecting handle is fixedly connected to the upper side of the grinding head body. A jack adapted to the connecting handle is provided inside the connecting shaft. A fixing plate is fixedly connected to the lower end of the connecting shaft. A limiting unit for clamping the connecting handle is arranged on the outer side of the fixing plate. The limiting unit includes a plurality of moving holes. For this grinding head fixture for polishing the rear cover glass of a 3D mobile phone, by providing a rotating ring, a connecting shaft, a conical ring, a contact rod, a moving hole, a limiting groove, a limiting tube, a bottom block, and an L-shaped plate, it is convenient to rotate the rotating ring, and it is convenient to control a plurality of limiting tubes to limit the connecting handle on the grinding head body. And through the lifting rod, the stabilizing plate and the reinforcing block at the bottom, a plurality of reinforcing blocks at the bottom limit the other part of the connecting handle, making the clamping force of the grinding head more uniform and making the grinding head more stable when polishing the rear cover glass of a 3D mobile phone.

Description

Technical Field

[0001] The present invention relates to the technical field of glass polishing, and particularly to a grinding head fixture for polishing the glass of a 3D mobile phone back cover. Background Art

[0002] A 3D mobile phone refers to a smart phone that can achieve naked-eye 3D display or 3D interaction functions. Through special screen technology or sensors, users can experience a stereoscopic visual effect without wearing 3D glasses.

[0003] After retrieval, a Chinese patent with the application number "CN201811553878.2" is specifically a polishing machine for quickly replacing a grinding head or a grinding head fixture. When it is necessary to clamp an external grinding head, the second outer ring sleeve is pushed. The second outer ring sleeve pushes the second spring member to move, and the second clamping member disengages from the pressing of the second spring member. The second clamping member moves along the axial direction of the second through hole towards the direction of the second outer ring sleeve until the external grinding head is installed in place. Then the second outer ring sleeve is released, and the second spring member restores its original position along the axial direction of the second through hole and presses the rod portion of the external grinding head again to complete the fixation of the external grinding head.

[0004] When polishing the glass of a 3D mobile phone back cover, the glass is polished by a rotating grinding head. Before use, the grinding head needs to be installed on the output shaft using a fixture. In the prior art, the handle portion of the grinding head is inserted into the clamping member of the fixture for clamping, but some positions of the handle portion of the grinding head are not limited, and only the portion inserted into the clamping sleeve in the fixture is limited, resulting in low stability during grinding head polishing and uneven distribution of the clamping force. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a grinding head fixture for polishing the glass of a 3D mobile phone back cover, which solves the problem of uneven clamping force when the grinding head fixture clamps the grinding head.

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] A grinding head fixture for polishing the glass of a 3D mobile phone back cover includes a connecting shaft and a grinding head body. A connecting handle is fixedly connected to the upper side of the grinding head body. A jack adapted to the connecting handle is opened inside the connecting shaft. A fixing plate is fixedly connected to the lower end of the connecting shaft. A limiting unit for clamping the connecting handle is arranged outside the fixing plate. The limiting unit includes a plurality of moving holes opened on the outside of the connecting shaft. A plurality of limiting grooves are opened on the outside of the connecting handle. A stabilizing component for strengthening the connecting handle is arranged on the lower side of the fixing plate. A control component for controlling the stabilizing component is arranged on the upper side of the fixing plate. A reinforcing component is arranged outside the control component.

[0008] Preferably, the control assembly includes a swivel ring disposed outside the connecting shaft. A conical ring and a control ring are fixedly connected to the outside of the swivel ring. The control ring is located below the conical ring. Limit tubes are arranged inside multiple moving holes. The limit tubes are adapted to the limit grooves. A fixed ring is fixedly connected to the outside of the limit tubes. A bottom block is fixedly connected to the lower side of the fixed ring. An L-shaped plate is fixedly connected to the lower side of the bottom block. A contact rod is fixedly connected to the side of the L-shaped plate close to the conical ring. An arc-shaped block is arranged at the outer end of the contact rod. The arc-shaped block abuts against the conical ring. A first spring is fixedly connected between the connecting shaft and the bottom block.

[0009] Preferably, internal threads are provided inside the swivel ring, and external threads are provided on the outside of the connecting shaft. The external threads and the internal threads are adapted. Multiple control rods are fixedly connected to the outside of the control ring.

[0010] Preferably, the stabilizing assembly includes a bottom ring rotatably connected to the lower side of the control ring. A lifting ring is fixedly connected to the lower side of the bottom ring. Multiple lifting rods are fixedly connected to the lower side of the lifting ring. The lower ends of the lifting rods pass through the lower side of the fixing plate. Multiple branch blocks are fixedly connected to the lower side of the fixing plate. Stabilizing plates are rotatably connected to the outside of multiple branch blocks. A reinforcing block is fixedly connected to the side of the stabilizing plate close to the connecting handle. A second rectangular groove is provided at the lower end of the lifting rod. An inclined plate two is rotatably connected to the inside of the second rectangular groove. A second rotating block is fixedly connected to the upper side of the stabilizing plate. The second rotating block is rotatably connected to the inclined plate two. The reinforcing block is of an arc-shaped structure.

[0011] Preferably, multiple telescopic grooves are provided on the outside of the limit tube. Stabilizing blocks are arranged inside multiple telescopic grooves. A moving rod is fixedly connected to the outside of the stabilizing block. A first rectangular groove is provided at one end of the moving rod and inside the limit tube. An inclined plate one is rotatably connected to the inside of the first rectangular groove. A first piston disk is arranged inside the limit tube. A pushing block is fixedly connected to the side of the first piston disk close to the connecting handle. A first rotating block is fixedly connected to the outside of the pushing block. The first rotating block is rotatably connected to the inclined plate one. A second spring is fixedly connected between the outside of the pushing block and the inner wall of the limit tube. A gas cylinder is fixedly connected to the side of the bottom block away from the connecting shaft. A connecting pipe is fixedly connected between the gas cylinder and the limit tube. A second piston disk is arranged inside the gas cylinder. A third spring is fixedly connected between one side of the second piston disk and the inner wall of the gas cylinder. A pressing rod is fixedly connected to the other side of the second piston disk. The pressing rod is slidably connected to the bottom block.

[0012] Preferably, the second piston disk is slidably connected to the gas cylinder, the first piston disk is slidably connected to the limit tube, and the stabilizing block is slidably connected to the telescopic groove.

[0013] Preferably, a perforation adapted to the connecting handle is provided on the lower side of the fixing plate, and the reinforcing block is made of rubber material.

[0014] Advantages

[0015] The present invention provides a grinding head fixture for polishing the back glass of a 3D mobile phone. Compared with the prior art, it has the following advantages:

[0016] (1) For the grinding head fixture for polishing the back glass of a 3D mobile phone, by setting a rotating ring, a connecting shaft, a conical ring, a contact rod, a moving hole, a limiting groove, a limiting tube, a bottom block, and an L-shaped plate, it is convenient to rotate the rotating ring, and it is convenient to control a plurality of limiting tubes to limit the connecting handle on the grinding head main body. And through the lifting rod, the stabilizing plate and the reinforcing block at the bottom, a plurality of reinforcing blocks at the bottom limit the other part of the connecting handle, making the clamping force of the grinding head more uniform and making the grinding head more stable when polishing the back glass of a 3D mobile phone.

[0017] (2) For the grinding head fixture for polishing the back glass of a 3D mobile phone, by setting a limiting tube, a stabilizing block, a moving rod, an inclined plate I, a piston disk I, an air cylinder, a piston disk II and an extrusion rod, when the limiting tube limits the connecting handle, the plurality of stabilizing blocks in the limiting tube are controlled to expand, so as to increase the limiting effect of the stabilizing block limiting tube on the connecting handle and increase the stability of the grinding head installation. Description of the Drawings

[0018] Figure 1 is the overall three-dimensional structure diagram of the present invention;

[0019] Figure 2 is the sectional three-dimensional structure diagram of the present invention;

[0020] Figure 3 is the partial three-dimensional structure diagram of the present invention;

[0021] Figure 4 is Figure 3 the enlarged view at A in

[0022] Figure 5 is the three-dimensional structure diagram of the stabilizing component in the present invention;

[0023] Figure 6 is Figure 5 the enlarged view at B in

[0024] Figure 7 is the sectional three-dimensional structure diagram of the reinforcing component in the present invention;

[0025] Figure 8 is Figure 7 the enlarged view at C in

[0026] Figure 9 is Figure 7 the enlarged view at D in

[0027] In the figure: 1, connecting shaft; 2, fixed plate; 3, connecting handle; 4, grinding head main body; 5, limiting unit; 6, jack; 7, external thread;

[0028] 51, moving hole; 52, limiting groove; 53, control component; 54, reinforcement component; 55, stabilizing component;

[0029] 531, rotating ring; 532, conical ring; 533, control ring; 534, control rod; 535, limiting tube; 536, fixed ring; 537, bottom block; 538, L-shaped plate; 539, contact rod; 5310, spring one;

[0030] 541, telescopic groove; 542, stabilizing block; 543, moving rod; 544, rectangular groove one; 545, inclined plate one; 546, rotating block one; 547, pushing block; 548, piston disc one; 549, spring two; 5410, connecting pipe; 5411, air cylinder; 5412, spring three; 5413, piston disc two; 5414, extrusion rod;

[0031] 551, bottom ring; 552, lifting ring; 553, lifting rod; 554, rectangular groove two; 555, branch block; 556, stabilizing plate; 557, inclined plate two; 558, rotating block two; 559, reinforcement block. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment 1

[0034] Please refer to Figure 1 - Figure 6, the present invention provides a technical solution: a grinding head fixture for polishing the rear cover glass of a 3D mobile phone, including a connecting shaft 1 and a grinding head body 4. A connecting handle 3 is fixedly connected to the upper side of the grinding head body 4. A jack 6 adapted to the connecting handle 3 is provided inside the connecting shaft 1. A fixing plate 2 is fixedly connected to the lower end of the connecting shaft 1. A limiting unit 5 for clamping the connecting handle 3 is arranged outside the fixing plate 2. The limiting unit 5 includes a plurality of moving holes 51 opened on the outside of the connecting shaft 1. A plurality of limiting grooves 52 are opened on the outside of the connecting handle 3. A stabilizing component 55 for strengthening the connecting handle 3 is arranged on the lower side of the fixing plate 2. A control component 53 for controlling the stabilizing component 55 is arranged on the upper side of the fixing plate 2. A reinforcing component 54 is arranged outside the control component 53. When installing the grinding head body 4, first insert the connecting handle 3 into the jack 6, and then through the limiting unit 5, it is convenient to quickly limit the connecting handle 3 and increase the installation stability of the grinding head body 4.

[0035] The control component 53 includes a rotating ring 531 arranged on the outside of the connecting shaft 1. A conical ring 532 and a control ring 533 are fixedly connected to the outside of the rotating ring 531. The control ring 533 is located below the conical ring 532. A limiting tube 535 is arranged inside each of the plurality of moving holes 51. The limiting tube 535 is adapted to the limiting groove 52. A fixing ring 536 is fixedly connected to the outside of the limiting tube 535. A bottom block 537 is fixedly connected to the lower side of the fixing ring 536. An L-shaped plate 538 is fixedly connected to the lower side of the bottom block 537. A contact rod 539 is fixedly connected to the side of the L-shaped plate 538 close to the conical ring 532. An arc-shaped block is arranged at the outer end of the contact rod 539. The arc-shaped block abuts against the conical ring 532. A first spring 5310 is fixedly connected between the connecting shaft 1 and the bottom block 537. Internal threads are arranged inside the rotating ring 531. External threads 7 are opened on the outside of the connecting shaft 1. The external threads 7 are adapted to the internal threads. A plurality of control rods 534 are fixedly connected to the outside of the control ring 533. When installing the connecting handle 3, first rotate the control ring 533 through the control rods 534. The control ring 533 drives the rotating ring 531 to rotate. The rotating ring 531 drives the conical ring 532 to rotate. Since the rotating ring 531 is threadedly connected to the connecting shaft 1, the rotating ring 531 drives the conical ring 532 to rise. The conical ring 532 squeezes the contact rod 539 to move in the direction close to the connecting handle 3. The contact rod 539 drives the L-shaped plate 538 to move. The L-shaped plate 538 drives the bottom block 537 to move. The bottom block 537 drives the fixing ring 536 to move. The fixing ring 536 drives the limiting tube 535 to move, so that a plurality of limiting tubes 535 move into the limiting grooves 52, and a plurality of limiting tubes 535 initially limit the grinding head body 4 on the connecting handle 3.

[0036] The stabilizing component 55 includes a bottom ring 551 which is rotatably connected to the lower side of the control ring 533. A lifting ring 552 is fixedly connected to the lower side of the bottom ring 551. A plurality of lifting rods 553 are fixedly connected to the lower side of the lifting ring 552. The lower ends of the lifting rods 553 pass through the lower side of the fixing plate 2. A plurality of branch blocks 555 are fixedly connected to the lower side of the fixing plate 2. Stabilizing plates 556 are rotatably connected to the outer sides of the plurality of branch blocks 555. A reinforcing block 559 is fixedly connected to the side of the stabilizing plate 556 close to the connecting handle 3. A second rectangular groove 554 is formed in the lower end of the lifting rod 553. An inclined plate 557 is rotatably connected to the inner side of the second rectangular groove 554. A second rotating block 558 is fixedly connected to the upper side of the stabilizing plate 556. The second rotating block 558 is rotatably connected to the inclined plate 557. The reinforcing block 559 has an arc-shaped structure. A through hole adapted to the connecting handle 3 is formed in the lower side of the fixing plate 2. The reinforcing block 559 is made of rubber material. When the limiting tube 535 limits the connecting handle 3, the control ring 533 drives the bottom ring 551 to rise, the bottom ring 551 drives the lifting ring 552 to rise, the lifting ring 552 drives the lifting rods 553 to rise, the lifting rods 553 drive the inclined plate 557 to rotate, and the inclined plate 557 drives the reinforcing block 559 on the stabilizing plate 556 to approach the connecting handle 3, so that a plurality of reinforcing blocks 559 limit another position of the connecting handle 3, making the clamping force distribution of the grinding head main body 4 uniform and increasing the clamping stability.

[0037] Embodiment 2

[0038] As Figure 7 - Figure 9 As shown, a grinding head fixture for polishing the 3D mobile phone back cover glass includes a connecting shaft 1 and a grinding head main body 4. A connecting handle 3 is fixedly connected to the upper side of the grinding head main body 4. A jack 6 adapted to the connecting handle 3 is formed in the inner side of the connecting shaft 1. A fixing plate 2 is fixedly connected to the lower end of the connecting shaft 1. A limiting unit 5 for clamping the connecting handle 3 is arranged on the outer side of the fixing plate 2. The limiting unit 5 includes a plurality of moving holes 51 which are formed in the outer side of the connecting shaft 1. A plurality of limiting grooves 52 are formed in the outer side of the connecting handle 3. A stabilizing component 55 for reinforcing the connecting handle 3 is arranged on the lower side of the fixing plate 2. A control component 53 for controlling the stabilizing component 55 is arranged on the upper side of the fixing plate 2. A reinforcing component 54 is arranged on the outer side of the control component 53. When installing the grinding head main body 4, first insert the connecting handle 3 into the jack 6, and then through the limiting unit 5, it is convenient to quickly limit the connecting handle 3 and increase the installation stability of the grinding head main body 4.

[0039] The reinforcement component 54 includes that a plurality of telescopic grooves 541 are formed on the outer side of the limiting tube 535, stabilizing blocks 542 are arranged on the inner sides of the plurality of telescopic grooves 541, a moving rod 543 is fixedly connected to the outer side of the stabilizing block 542, a first rectangular groove 544 is formed at one end of the moving rod 543 and inside the limiting tube 535, a first inclined plate 545 is rotatably connected to the inner side of the first rectangular groove 544, a first piston disc 548 is arranged inside the limiting tube 535, a pushing block 547 is fixedly connected to the side of the first piston disc 548 close to the connecting handle 3, a first rotating block 546 is fixedly connected to the outer side of the pushing block 547, the first rotating block 546 is rotatably connected to the first inclined plate 545, a second spring 549 is fixedly connected between the outer side of the pushing block 547 and the inner wall of the limiting tube 535, a cylinder 5411 is fixedly connected to the side of the bottom block 537 away from the connecting shaft 1, a connecting pipe 5410 is fixedly connected between the cylinder 5411 and the limiting tube 535, a second piston disc 5413 is arranged inside the cylinder 5411, a third spring 5412 is fixedly connected between one side of the second piston disc 5413 and the inner wall of the cylinder 5411, a pressing rod 5414 is fixedly connected to the other side of the second piston disc 5413, the pressing rod 5414 is slidably connected to the bottom block 537, the second piston disc 5413 is slidably connected to the cylinder 5411, the first piston disc 548 is slidably connected to the limiting tube 535, and the stabilizing block 542 is slidably connected to the telescopic groove 541. When the limiting tube 535 moves into the limiting groove 52, the bottom block 537 drives the cylinder 5411 to move, and the cylinder 5411 drives the pressing rod 5414 on the second piston disc 5413 to move. When the pressing rod 5414 contacts the connecting shaft 1, continue to control the movement of the limiting tube 535, so that the pressing rod 5414 drives the second piston disc 5413 to move in a direction away from the connecting shaft 1. The second piston disc 5413 pushes the gas in the cylinder 5411 out, and through the connecting pipe 5410, the gas is transported into the limiting tube 535. The gas pushes the first piston disc 548 to move, the first piston disc 548 drives the pushing block 547 to move, the pushing block 547 drives the first inclined plate 545 to rotate, the first inclined plate 545 drives the moving rod 543 to move, the moving rod 543 drives the stabilizing block 542 to move, so that the plurality of stabilizing blocks 542 expand outwards. Since the limiting tube 535 is located in the limiting groove 52, the stabilizing blocks 542 abut against the inner walls of the limiting groove 52 and the moving holes 51, so that the limiting effect of the limiting tube 535 on the connecting handle 3 is increased, the stability of the installation of the grinding head main body 4 is enhanced, and it is convenient to polish the 3D mobile phone back cover glass later.

[0040] Working principle: When in use, the staff first inserts the connecting handle 3 into the jack 6, and then rotates the control ring 533 to make the conical ring 532 on the control rotating ring 531 rise. Under the action of the contact rod 539, L-shaped plate 538, bottom block 537, and fixed ring 536, multiple limiting tubes 535 are controlled to move towards the connecting handle 3, facilitating the preliminary limiting of the connecting handle 3 by the multiple limiting tubes 535. At the same time, under the action of the bottom ring 551 and lifting ring 552, the control ring 533 controls the lifting rod 553 to rise. Under the action of the second inclined plate 557 and the stabilizing plate 556, multiple reinforcing blocks 559 are controlled to clamp and limit another part of the connecting handle 3, making the clamping force on the grinding head main body 4 more uniform. At the same time, the limiting tube 535 drives the extrusion rod 5414 to move. When the extrusion rod 5414 contacts the connecting shaft 1, under the action of the second piston disc 5413, connecting pipe 5410, first piston disc 548, and first inclined plate 545, multiple stabilizing blocks 542 are controlled to expand outwards, increasing the stability of the limiting tube 535 for limiting the connecting handle 3.

[0041] It should be noted that in this article, 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 elements inherent to such process, method, article or device.

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grinding head fixture for polishing the 3D mobile phone back cover glass, comprising a connecting shaft (1) and a grinding head body (4). A connecting handle (3) is fixedly connected to the upper side of the grinding head body (4). A jack (6) adapted to the connecting handle (3) is provided inside the connecting shaft (1). It is characterized in that: The lower end of the connecting shaft (1) is fixedly connected with a fixing plate (2). An outer side of the fixing plate (2) is provided with a limiting unit (5) for clamping a connecting handle (3). The limiting unit (5) includes a plurality of moving holes (51) which are formed in an outer side of the connecting shaft (1). A plurality of limiting grooves (52) are formed in an outer side of the connecting handle (3). A lower side of the fixing plate (2) is provided with a stabilizing assembly (55) for strengthening the connecting handle (3). An upper side of the fixing plate (2) is provided with a control assembly (53) for controlling the stabilizing assembly (55). An outer side of the control assembly (53) is provided with a reinforcing assembly (54). The control assembly (53) includes a rotating ring (531) which is arranged on an outer side of the connecting shaft (1). An outer side of the rotating ring (531) is fixedly connected with a conical ring (532) and a control ring (533). The control ring (533) is located below the conical ring (532). A limiting tube (535) is arranged inside each of the plurality of moving holes (51). The limiting tube (535) is adapted to the limiting groove (52). An outer side of the limiting tube (535) is fixedly connected with a fixing ring (536). A bottom block (537) is fixedly connected to a lower side of the fixing ring (536). An L-shaped plate (538) is fixedly connected to a lower side of the bottom block (537). A contact rod (539) is fixedly connected to a side of the L-shaped plate (538) close to the conical ring (532). An arc-shaped block is arranged at an outer end of the contact rod (539). The arc-shaped block abuts against the conical ring (532). A first spring (5310) is fixedly connected between the connecting shaft (1) and the bottom block (537). The stabilizing assembly (55) includes a bottom ring (551) which is rotatably connected to a lower side of the control ring (533). A lifting ring (552) is fixedly connected to a lower side of the bottom ring (551). A plurality of lifting rods (553) are fixedly connected to a lower side of the lifting ring (552). Lower ends of the lifting rods (553) pass through a lower side of the fixing plate (2). A plurality of branch blocks (555) are fixedly connected to a lower side of the fixing plate (2). A stabilizing plate (556) is rotatably connected to an outer side of each of the plurality of branch blocks (555). A reinforcing block (559) is fixedly connected to a side of the stabilizing plate (556) close to the connecting handle (3). A second rectangular groove (554) is formed in a lower end of the lifting rod (553). An inclined plate two (557) is rotatably connected to an inside of the second rectangular groove (554). A rotating block two (558) is fixedly connected to an upper side of the stabilizing plate (556). The rotating block two (558) is rotatably connected to the inclined plate two (557). The reinforcing block (559) has an arc-shaped structure.

2. The grinding head fixture for polishing the 3D mobile phone back cover glass according to claim 1, wherein: Internal threads are provided inside the rotating ring (531). External threads (7) are formed in an outer side of the connecting shaft (1). The external threads (7) are adapted to the internal threads. A plurality of control rods (534) are fixedly connected to an outer side of the control ring (533).

3. The grinding head fixture for polishing the 3D mobile phone back cover glass according to claim 1, wherein: The described reinforcement component (54) includes that a plurality of telescopic grooves (541) are formed on the outer side of the limit tube (535), a stabilizing block (542) is arranged on the inner side of each of the plurality of telescopic grooves (541), a moving rod (543) is fixedly connected to the outer side of the stabilizing block (542), a first rectangular groove (544) is formed at one end of the moving rod (543) and inside the limit tube (535), a first inclined plate (545) is rotatably connected to the inner side of the first rectangular groove (544), a first piston disc (548) is arranged inside the limit tube (535), a push block (547) is fixedly connected to the side of the first piston disc (548) close to the connecting handle (3), a first rotating block (546) is fixedly connected to the outer side of the push block (547), the first rotating block (546) is rotatably connected to the first inclined plate (545), a second spring (549) is fixedly connected between the outer side of the push block (547) and the inner wall of the limit tube (535), a cylinder (5411) is fixedly connected to the side of the bottom block (537) far from the connecting shaft (1), a connecting pipe (5410) is fixedly connected between the cylinder (5411) and the limit tube (535), a second piston disc (5413) is arranged inside the cylinder (5411), a third spring (5412) is fixedly connected between one side of the second piston disc (5413) and the inner wall of the cylinder (5411), an extrusion rod (5414) is fixedly connected to the other side of the second piston disc (5413), and the extrusion rod (5414) is slidably connected to the bottom block (537).

4. The grinding head fixture for polishing the 3D mobile phone back cover glass according to claim 3, wherein: The second piston disc (5413) is slidably connected to the cylinder (5411), the first piston disc (548) is slidably connected to the limit tube (535), and the stabilizing block (542) is slidably connected to the telescopic groove (541).

5. A grinding head fixture for polishing the 3D mobile phone back cover glass according to claim 1, characterized in that: A perforation adapted to the connecting handle (3) is formed on the lower side of the fixing plate (2), and the reinforcing block (559) is made of rubber material.

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