Injection mold cavity surface polishing device

Abstract

The present invention belongs to the technical field of polishing devices, and particularly relates to a polishing device for the surface of a cavity of an injection mold, comprising a frame, a screw rod 1 rotatably mounted on the frame, a sliding mechanism 1 slidably mounted on the frame, the sliding mechanism 1 comprising a threaded block, the threaded block comprising a sub-block 1 and a sub-block 2, when the threaded block is engaged with the screw rod 1, the screw rod 1 rotates to drive the sliding mechanism 1 to move, when the threaded block is separated from the screw rod 1, the sliding mechanism 1 slides back and forth along the extension direction of the screw rod 1; at least two pulleys are rotatably mounted on the frame, the transmission belt 2 is mounted on the pulley, the pulley is connected to the screw rod 1 through a gear pair, a pressing plate is mounted on the sliding mechanism 1, the pressing plate is used to press the transmission belt 2 tightly with the sub-block 1, so that the transmission belt 2 moves synchronously with the sliding mechanism 1, and then drives the pulley to rotate; the polishing mechanism is mounted on the sliding mechanism 1. The present invention can solve the technical problem that the position of the polishing mechanism in the automatic polishing device cannot be freely changed.

Description

Technical Field

[0001] The invention belongs to the technical field of polishing devices, and in particular relates to a polishing device for the surface of an injection mold cavity. Background Art

[0002] Batch injection molds are tools used to produce a large number of identical plastic parts and are used in the automotive manufacturing industry. In the automotive industry, many parts are manufactured by injection molding, such as bumpers, dashboards, door handles, etc. Polishing the injection mold is a very important step, which can significantly reduce the roughness of the mold surface, making the surface of the injected parts smoother and more delicate. At the same time, it can prevent plastic products from adhering to the mold during the cooling process, ensuring the integrity and aesthetics of the product.

[0003] A Chinese patent document with authorization announcement number CN116872071B discloses a polishing device for an injection mold, including a placement seat, a vertical support is arranged on one side of the placement seat along its length direction, a polishing mechanism and a driving mechanism for driving the polishing mechanism to move are arranged on the vertical support; the driving mechanism includes a vertical driving member for driving the polishing mechanism to move in the vertical direction, a longitudinal driving member for driving the polishing mechanism to move along the length direction of the placement seat, and a transverse driving member for driving the polishing mechanism to move along the width direction of the placement seat. The above patent drives the polishing mechanism to move vertically, longitudinally and transversely by arranging a driving mechanism composed of a vertical driving member, a longitudinal driving member and a transverse driving member, thereby replacing the manual movement of the polishing mechanism to polish the injection mold, thereby improving efficiency and reducing labor intensity. However, when a certain position in the injection mold is not polished properly and needs to be re-polished, the staff needs to operate the transverse driving member and the longitudinal driving member to position the polishing mechanism, and then repeatedly polish the position, which makes positioning difficult and inflexible to use. Summary of the invention

[0004] The invention provides an injection mold cavity surface polishing device to solve the technical problem that the position of a polishing mechanism in an automatic polishing device cannot be freely changed.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] A device for polishing the surface of an injection mold cavity, comprising a frame, a screw rod, a sliding mechanism, and a polishing mechanism. The frame has a placement groove for placing the mold. The screw rod is rotatably assembled on the frame. The sliding mechanism is slidably assembled on the frame. The sliding mechanism comprises a threaded block. The threaded block comprises a divided block 1 and a divided block 2. When the divided block 1 and the divided block 2 are engaged with the screw rod 1, the screw rod 1 rotates to drive the sliding mechanism 1 to reciprocate along the extension direction of the screw rod 1. When the divided block 1 and the divided block 2 are separated from the screw rod 1, the sliding mechanism 1 moves along the screw rod 1. The first screw block is provided with a connecting assembly, which includes a transmission belt and a pressure plate. At least two pulleys are rotatably mounted on the frame. The transmission belt is mounted on the pulley, which is connected to the screw through a gear pair. The pressure plate is mounted on the sliding mechanism, which is used to press the transmission belt tightly against the block, so that the transmission belt moves synchronously with the sliding mechanism, thereby driving the pulley to rotate. The polishing mechanism is mounted on the sliding mechanism to move synchronously with the sliding mechanism along the extension direction of the screw.

[0007] The beneficial effects are as follows: when block one and block two are combined, as screw rod one rotates, the thread block moves back and forth along the extension direction of the screw rod driven by the screw rod, and the polishing device automatically polishes the mold located in the placement groove; when the polishing effect of a certain position on the mold is unqualified, screw rod one stops rotating, block one and block two are separated, the thread block is slid to a certain position, and the polishing mechanism polishes the position. The present invention adopts a combination of automatic polishing and manual polishing, which is flexible and convenient to use; the connecting mechanism converts the sliding of the thread block into the rotation of screw rod one, and the thread in the thread block always corresponds to the thread on screw rod one. When the mold needs to be automatically polished, block one and block two are directly combined, so that the threads in block one and block two can be engaged with the threads on screw rod one, and there is no need to reciprocate to adjust the relative position of the thread block and screw rod one, thereby improving the polishing efficiency.

[0008] Furthermore, a linear guide rail 1 parallel to the screw rod 1 is fixedly assembled on the frame, and the sliding mechanism 1 also includes a sliding block and a guide rod. The sliding block is slidably assembled on the linear guide rail 1, and the guide rod is fixedly assembled on the sliding block. Block 1, block 2 and the pressure plate are slidably assembled on the guide rod along the extension direction of the guide rod; a driving device 2 and a driving device 3 are fixedly assembled on the sliding block, and the driving device 2 is used to drive the pressure plate and block 1 to synchronously approach or move away from the transmission belt 2. When the block 1 and the pressure plate are in contact with the transmission belt 2, the block 1 is separated from the screw rod 1, and the driving device 3 is used to drive the block 2 to approach or move away from the screw 1.

[0009] Furthermore, the driving device 2 includes a motor 3 and a screw 3. The motor 3 is fixedly mounted on the sliding block. The motor 3 is used to drive the screw 3 to rotate around its own axis. The pressure plate and the block 1 are both threadedly mounted on the screw 3. The screw 3 has a thread 1 and a thread 2 with opposite rotation directions. The screw hole on the pressure plate engages with the thread 1, and the screw hole on the block 1 engages with the thread.

[0010] The beneficial effects are as follows: block one and block two are driven separately, and during the process that block one is separated from screw one and moves toward transmission belt two simultaneously with the pressure plate, block two is engaged with screw one and sliding mechanism one cannot slide; after the pressure plate and block one are pressed tightly and fixed on transmission belt two, block two is moved away from screw one, avoiding the situation that the pressure plate and block one have not yet been fixed on transmission belt two, but sliding mechanism one has already slid, thereby ensuring that the movement of transmission belt two corresponds to the rotation of screw one.

[0011] Furthermore, screw one is driven by motor one, and the output shaft of motor one is connected to screw one through connecting component two, connecting component two includes friction disc one and friction disc four, friction disc one is fixedly assembled at one end of screw one, friction disc four is fixedly assembled on the output shaft of motor one, and a driving device one is provided on the frame for driving friction disc one and friction disc four to move closer to or away from each other, and when friction disc one and friction disc four are in contact with each other, motor one drives screw one to rotate around its own axis.

[0012] The beneficial effect is that during automatic polishing, the driving device 1 makes the friction disk 1 and the friction disk 4 fit together; when the polishing mechanism needs to polish a certain position on the mold, the driving device 1 separates the friction disk 1 and the friction disk 4 to prevent the output shaft of the stopped motor 1 from affecting the rotation of the screw 1.

[0013] Furthermore, a worm is rotatably assembled on the frame and is parallel to and rotates synchronously with the pulley. A worm wheel coaxial with the worm is rotatably assembled on screw one, and the worm engages with the worm wheel. Connecting assembly two also includes friction discs two and friction discs three that move synchronously. Friction disc two is fixedly connected to the worm wheel. A circular shaft one coaxial with the screw is inserted into screw one. Friction disc three is connected to circular shaft one through connecting rod two. Screw one has a sliding hole for connecting rod two to slide back and forth along the extension direction of screw one. The end of circular shaft one extending out of screw one is rotatably connected to the output shaft of motor one. When friction disc one and friction disc four are in contact, friction disc two and friction disc three are separated. When friction disc two and friction disc three are in contact, friction disc one and friction disc four are separated.

[0014] The beneficial effects are: when block one and block two engage with screw one, friction disc one fits with friction disc four, and friction disc two separates from friction disc three. At this time, the torque of the output shaft of motor one is transmitted to screw one through the friction force between friction disc one and friction disc four; when block one and pressure plate are pressed tightly against transmission belt two, friction disc two fits with friction disc three, and friction disc one separates from friction disc four. The movement of sliding mechanism one drives transmission belt two to move, thereby driving the worm to rotate, the worm drives the worm wheel to rotate, and the worm wheel drives screw one to rotate through the friction force between friction disc two and friction disc three.

[0015] Furthermore, there are two screw rods 1, which rotate synchronously through a transmission belt 1, a linear guide rail 2 and a screw rod 2 are provided between the two sliding mechanisms 1, both ends of the linear guide rail 2 are fixedly connected to the sliding mechanism 1, both ends of the screw rod 2 are rotatably assembled on the sliding mechanism 1, the sliding mechanism 2 is slidably assembled on the linear guide rail 2, the connection method between the sliding mechanism 2 and the screw rod 2 is the same as the connection method between the sliding mechanism 1 and the screw rod 1, the screw rod 2 is driven by a motor 2, the connection method between the motor 2 and the screw rod 2 is the same as the connection method between the motor 1 and the screw rod 1, and the polishing mechanism is assembled on the sliding mechanism 2.

[0016] The beneficial effect is that the polishing mechanism can reciprocate along the extending direction of the first screw rod and can also reciprocate along the extending direction of the second screw rod, so that the polishing area is larger.

[0017] Furthermore, the polishing mechanism includes a polishing head and a mounting frame, the polishing head can be detachably mounted on the mounting frame, and a driving device five is provided between the mounting frame and the sliding mechanism two, and the driving device five is used to drive the mounting frame to reciprocate in a direction that is perpendicular to both screw one and screw two.

[0018] The beneficial effects are: the driving device can stably control the pressure between the polishing head and the mold, so that the surface of the mold after polishing is more uniform, ensuring product quality; the detachable connection design makes it convenient for users to replace different types of polishing heads according to actual conditions.

[0019] Furthermore, a high friction coating is applied on the second transmission belt and the pressure plate.

[0020] The beneficial effects of the present invention are:

[0021] 1. When block 1 and block 2 are combined, motor 1 and motor 2 are started to drive the polishing mechanism to automatically polish the mold; when a certain position needs to be polished, block 1 and block 2 are separated, and the user can move the polishing mechanism to any position. No matter where the polishing mechanism is located, the threads on block 1 and block 2 always correspond to the threads on screw 1 and screw 2, and automatic polishing can be started from any position, which is flexible and convenient to use;

[0022] 2. When friction disc 1 is in contact with friction disc 4 and friction disc 2 is separated from friction disc 3, motor 1 drives screw 1 to rotate. Since friction disc 2 is connected to screw 1 as the worm wheel rotates, the worm wheel, worm and transmission belt 2 all remain stationary, avoiding unnecessary friction and extending the service life of transmission belt 2. When friction disc 1 is separated from friction disc 4 and friction disc 2 is in contact with friction disc 3, transmission belt 2 drives screw 1 and circular shaft 1 to rotate synchronously. Since circular shaft 1 is rotationally connected to the output shaft of motor 1, the rotation of screw 1 will not affect motor 1. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a structural schematic diagram of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the split structure;

[0025] Figure 3 Schematic diagram of the installation structure of motor 1;

[0026] Figure 4 It is a structural schematic diagram of a sliding mechanism 1;

[0027] Figure 5 This is a schematic diagram of the splitting of the connection component one;

[0028] Figure 6 This is a schematic diagram of the splitting of the connection component 2;

[0029] Figure 7 It is a schematic diagram of the installation structure of the second mounting base and the second screw rod;

[0030] Figure 8 It is a structural schematic diagram of the connection component 1 and the connection component 2 when the polishing head automatically polishes the mold;

[0031] Fig. 9 It is a schematic diagram of the structure of connecting component 1 and connecting component 2 when the polishing head moves freely.

[0032] Description of reference numerals:

[0033] 1. Frame; 2. Placement slot; 3. Polishing machine; 4. Mounting frame; 5. Polishing head; 6. Mounting seat 1; 7. Screw 1; 8. Connecting rod 1; 9. Transmission belt 1; 10. Motor 1; 11. Drive device 1; 12. Connecting rod 2; 13. Linear guide 1; 14. Sliding block; 15. Motor 3; 16. Screw 3; 17. Thread 1; 18. Guide rod; 19. Base; 20. Thread block; 21. Block 1; 22. Block 2; 23. Drive device 3; 24. Transmission belt 2 ; 25. Worm gear; 26. Worm; 27. Pressure plate; 28. Pulley; 29. ​​Gear one; 30. Gear two; 31. Thread two; 32. Friction disc one; 33. Friction disc two; 34. Friction disc three; 35. Friction disc four; 36. Round shaft one; 37. Bearing; 38. Sliding hole; 39. Round shaft two; 40. Groove; 41. Mounting seat two; 42. Screw two; 43. Motor two; 44. Drive device five; 45. Linear guide rail two; 46. Connecting rod three; 47. Drive device four. DETAILED DESCRIPTION

[0034] 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. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0035] A device for polishing the surface of an injection mold cavity, such as Figure 1 and Figure 2 As shown, it includes a frame 1, the frame 1 has a placement groove 2 for fixing the injection mold, a polishing mechanism is arranged above the placement groove 2, and the frame 1 is provided with a transverse driving mechanism for driving the polishing mechanism to move transversely and a longitudinal driving mechanism for driving the polishing mechanism to move longitudinally.

[0036] The polishing mechanism comprises a polishing machine 3 and a mounting frame 4. The polishing machine 3 is fixedly mounted on the mounting frame 4 by means of bolts or the like. The polishing machine 3 is provided with a detachably connected polishing head 5.

[0037] The transverse driving mechanism includes a mounting seat 6 and a screw rod 7; there are four mounting seats 6, which are fixedly mounted on the frame 1, and two screw rods 7, both ends of which are rotatably mounted on two mounting seats 6 opposite to each other in the transverse direction, wherein a connecting rod 8 is fixedly mounted between two mounting seats 6 opposite to each other in the longitudinal direction; Figure 3 As shown, a transmission belt 9 is installed between the two screw rods 7, and the transmission belt 9 is a synchronous belt. The transverse driving mechanism also includes a motor 10. The installation method of the motor 10 is: a transverse driving driving device 11 is fixedly assembled on the connecting rod 8, and the driving device 11 is an electric push rod or a hydraulic rod. A connecting rod 2 12 is fixedly assembled on the output end of the driving device 11, and the motor 10 is fixedly assembled on the connecting rod 2 12.

[0038] A linear guide rail 13 is fixedly mounted between two laterally opposite mounting seats 6, and a sliding mechanism 1 is slidably mounted on the linear guide rail 13. Figure 4As shown, the sliding mechanism 1 includes a sliding block 14, a threaded block 20 and a base 19. The sliding block 14 is slidably assembled on the linear guide rail 13. A driving device 2 is provided on both sides of the sliding block 14. The driving device 2 includes a motor 3 15 and a screw 3 16. The motor 3 15 is fixedly assembled on the sliding block 14. The screw 3 16 extends up and down and rotates around its own axis. The screw 3 16 is fixedly connected to the output shaft of the motor 3 15. The screw 3 16 has a thread 17. The bottom of the sliding block 14 is fixedly connected to the base 19 through a guide rod 18. The threaded block 20 is slidably assembled on the guide rod 18. The threaded block 20 is slidably assembled on the guide rod 18. 0 includes a block 1 21 and a block 22, which are arranged up and down, the block 1 21 is threadedly connected to the screw rod 3 16 and engages with the screw rod 1 17, and both sides of the block 22 are provided with a driving device 3 23 for driving up and down, the driving device 3 23 is an electric push rod or a hydraulic rod, the output end of the driving device 3 23 is fixedly connected to the block 22, and the fixed end of the driving device 3 23 is fixedly assembled on the base 19, the screw rod 1 7 is located between the block 1 21 and the block 22, and when the block 1 21 and the block 22 are fitted up and down, the screw hole in the thread block 20 engages with the screw rod 1 7.

[0039] A connecting assembly 1 is provided between the sliding mechanism 1 and the screw rod 7, such as Figure 5 As shown, the connecting assembly 1 converts the lateral movement of the sliding mechanism 1 into the rotational movement of the screw 1 7, and the connecting assembly 1 includes a transmission belt 24, a worm wheel 25, a worm 26, and a pressure plate 27. The transmission belt 24 is mounted between two laterally opposite mounting seats 1 6, and a pulley 28 is rotatably mounted on the mounting seat 1 6. The axis of the pulley 28 extends longitudinally, and the transmission belt 24 is rotatably mounted on the pulley 28; the worm 26 is arranged below the pulley 28 and rotatably mounted on the mounting seat 1 6, and the axis of the worm 26 is parallel to the axis of the pulley 28. A gear 1 29 coaxial with the pulley 28 is fixed at the end of the pulley 28, and a gear 2 30 coaxial with the worm 26 is fixed at the end of the worm 26, and the gear 1 29 and the gear 2 30 mesh with each other. The worm wheel 25 is mounted on the screw rod 7 and rotatably assembled thereon. The worm wheel 25 is coaxially arranged with the screw rod 7, and the worm wheel 25 is engaged with the worm 26. The pressure plate 27 is slidably assembled on the guide rod 18 up and down. The pressure plate 27 is located in the transmission belt 24 and between the block 1 21 and the sliding block 14. The screw rod 3 16 has a thread 2 31 which is opposite to the thread 1 17. The pressure plate 27 is threadedly connected to the screw rod 3 16 and is engaged with the thread 2 31. The outer peripheral surface of the pulley 28 and the bottom surface of the pressure plate 27 are both provided with a high friction coating.

[0040] The output shaft of the motor 10 is connected to the screw 7 through a connecting component 2. Figure 6 As shown, the connecting assembly 2 includes a friction plate 1 32, a friction plate 2 33, a friction plate 34 and a friction plate 4 35. The friction plate 1 32 is fixed on the outer peripheral surface of the end of the screw 1 7; the friction plate 2 33 is fixed on the worm gear 25, referring to Figure 5 The worm wheel 25 is located between the friction disc 2 33 and the mounting seat 16 close to the friction disc 1 32. The friction disc 2 33 and the worm wheel 25 are both rotatably assembled on the screw rod 1 7. The axis around which the friction disc 2 33 and the worm wheel 25 rotate coincides with the axis of the screw rod 1 7. A round shaft 1 36 is inserted into the end of the screw rod 1 7 provided with the friction disc 1 32. One end of the round shaft 1 36 extending out of the screw rod 1 7 is rotatably assembled with a bearing 37. The inner ring of the bearing 37 is fixed on the round shaft 1 36. The other end of the round shaft 1 36 is fixedly assembled with the friction disc 34 through the connecting rod 3 46. The screw rod 1 7 has a sliding hole 38 for the connecting rod 3 46 to slide back and forth along the extending direction of the screw rod 1 7. Figure 3 The connecting rod 12 is rotatably connected to two horizontally extending round shafts 39, and the round shaft 39 is fixedly assembled with a friction plate 45 at one end facing the connecting rod 1 8. The round shaft 39 is provided with a groove 40, and the outer ring of the bearing 37 is fixed in the groove 40. The output shaft of the motor 10 is fixedly connected to one of the round shafts 39.

[0041] The longitudinal drive mechanism includes a mounting seat 41 and a screw rod 42. Figure 1 , Figure 2 and Figure 7 As shown, there are two mounting seats 2 41, which are fixedly assembled at the bottom of the sliding mechanism 1 respectively. The two mounting seats 2 41 are longitudinally opposite to each other, and the two ends of the screw rod 2 42 are respectively rotatably assembled on the mounting seats 2 41. The linear guide rail 2 45 is fixedly assembled between the two mounting seats 2 41. The sliding mechanism 2 is slidably assembled on the linear guide rail 2 45. The structure of the sliding mechanism 2 is exactly the same as that of the sliding mechanism 1. The screw rod 2 42 rotates to drive the sliding mechanism 2 to move longitudinally. The longitudinal driving mechanism also includes a motor 2 43. The installation method of the motor 2 43 is as follows: the two sides of the mounting seat 2 41 close to the friction disk 1 32 are fixedly assembled with a longitudinally telescopic driving device 4 47, and the motor 2 43 is fixedly assembled at the output end of the driving device 4 47; a connecting component 3 is provided between the sliding mechanism 2 and the screw rod 2 42, and the structure of the connecting component 3 is exactly the same as that of the connecting component 1. The output shaft of the motor 2 43 is connected to the screw rod 2 42 through the connecting component 4, and the connecting component 4 is exactly the same as the connecting component 2. The output shaft of the motor 2 43 is fixedly connected to the circular shaft 2 39.

[0042] The fixed end of the driving device 5 44 is vertically fixedly installed on the base 19 of the sliding mechanism 2. The driving device 5 44 is an electric push rod or a hydraulic rod. The output end of the driving device 5 44 is fixedly connected to the mounting frame 4.

[0043] The use of the present invention is:

[0044] ① When the polishing head 5 automatically polishes the mold, the block 1 21 and the block 2 22 corresponding to the sliding mechanism 1 are engaged with the screw 1 7, and the block 1 21 and the block 2 22 corresponding to the sliding mechanism 2 are engaged with the screw 2 42. The driving device 5 44 is extended until there is a predetermined pressure between the working surface of the polishing head 5 and the mold surface, and the motor 10, the motor 2 43 and the polishing machine 3 are started, and the polishing head 5 automatically polishes the mold. Figure 8 As shown, at this time, the friction disc 1 32 is in contact with the friction disc 4 35, the friction disc 2 33 is separated from the friction disc 3 34, and the pressure plate 27 and the block 1 21 are not in contact with the transmission belt 2 24;

[0045] ② When a certain position of the mold needs to be polished, turn off the motor 10 and the motor 2 43, adjust the length of the drive device 11 and the drive device 4 47, and since the movement of the components on the screw 1 7 and the screw 2 42 is the same, this embodiment takes the screw 1 7 as an example. Fig. 9 As shown, the friction disc 1 32 and the friction disc 4 35 are separated, and the friction disc 2 33 and the friction disc 3 34 are fitted together; then the motor 3 15 is started to drive the screw 3 16 to rotate, so that the block 1 21 and the pressure plate 27 are synchronously pressed and fitted with the transmission belt 2 24, and then the length of the driving device 3 23 is shortened to separate the block 22 from the screw 1 7, and finally the length of the driving device 5 44 is shortened, the polishing head 5 is separated from the mold, and the polishing mechanism is moved to a certain position and then the driving device 5 44 is extended, a predetermined pressure is generated between the polishing head 5 and the mold, and the polishing machine 3 is started, and the polishing mechanism is manually moved so that the polishing head 5 repeatedly polishes a certain position. During the movement of the polishing mechanism, the transmission belt 24 drives the worm 26 to rotate, and the worm 26 drives the worm wheel 25 to rotate, and the worm wheel 25 transmits the torque to the corresponding screw 1 7 through the friction force between the friction disc 2 33 and the friction disc 3 34, so that the threads on the blocks 1 21 and the blocks 22 always correspond to the screw 1 7;

[0046] ③ After polishing the mold at a certain position, start the motor three 15 in reverse, the screw three 16 rotates in the opposite direction, the pressure plate 27, the block one 21 and the transmission belt two 24 are separated, the internal thread on the block one 21 engages the screw one 7, the driving device three 23 is extended, the internal thread on the block two 22 engages the screw one 7, and the length of the driving device one 11 and the driving device four 47 is adjusted, so that the friction disk one 32 is fitted with the friction disk four 35, the friction disk two 33 is separated from the friction disk three 34, and the state in step ① is returned.

Claims

1. A device for polishing the surface of an injection mold cavity, characterized in that: The invention comprises a frame (1), a screw rod (7), a sliding mechanism (1), and a polishing mechanism. The frame (1) has a placement groove (2) for placing a mold. The screw rod (7) is rotatably assembled on the frame (1). The sliding mechanism (1) is slidably assembled on the frame (1). The sliding mechanism (1) comprises a threaded block (20). The threaded block (20) comprises a sub-block (21) and a sub-block (22). When the sub-block (21) and the sub-block (22) are engaged with the screw rod (7), the screw rod (7) rotates to drive the sliding mechanism (1) to reciprocate along the extension direction of the screw rod (7). When the sub-block (21) and the sub-block (22) are separated from the screw rod (7), the sliding mechanism (1) reciprocates along the extension direction of the screw rod (7). A connecting assembly 1 is provided between the threaded block (20) and the screw rod 1 (7), the connecting assembly 1 comprising a transmission belt 2 (24) and a pressure plate (27), at least two pulleys (28) are rotatably mounted on the frame (1), the transmission belt 2 (24) is mounted on the pulley (28), the pulley (28) is connected to the screw rod 1 (7) via a gear pair, the pressure plate (27) is mounted on the sliding mechanism 1, the pressure plate (27) is used to press the transmission belt 2 (24) with the block 1 (21) to fit tightly, so that the transmission belt 2 (24) moves synchronously with the sliding mechanism 1, thereby driving the pulley (28) to rotate; the polishing mechanism is mounted on the sliding mechanism 1 to move synchronously with the sliding mechanism 1 along the extension direction of the screw rod 1 (7); the frame (1) is provided with a polishing mechanism 1. A linear guide rail (13) is fixedly assembled and parallel to the screw rod (7). The sliding mechanism (1) also includes a sliding block (14) and a guide rod (18). The sliding block (14) is slidably assembled on the linear guide rail (13). The guide rod (18) is fixedly assembled on the sliding block (14). The block (1) (21), the block (22) and the pressure plate (27) are slidably assembled on the guide rod (18) along the extension direction of the guide rod (18). The sliding block (14) is fixedly assembled with a driving device (2) and a driving device (3) (23). The driving device (2) is used to drive the pressure plate (27) and the block (21) to synchronously approach or move away from the transmission belt (24). The block (21) and the pressure plate (27) are in contact with the transmission belt (24). 24), the block one (21) is separated from the screw one (7), and the driving device three (23) is used to drive the block two (22) to approach or move away from the screw one (7); the driving device two comprises a motor three (15) and a screw three (16), the motor three (15) is fixedly mounted on the sliding block (14), the motor three (15) is used to drive the screw three (16) to rotate around its own axis, the pressing plate (27) and the block one (21) are both threadedly mounted on the screw three (16), the screw three (16) has a thread one (17) and a thread two (31) with opposite rotation directions, the screw hole on the pressing plate (27) engages with the thread one (17), and the screw hole on the block one (21) engages with the thread two (31);The screw rod 1 (7) is driven by a motor 1 (10). The output shaft of the motor 1 (10) is connected to the screw rod 1 (7) via a connecting assembly 2. The connecting assembly 2 includes a friction disc 1 (32) and a friction disc 4 (35). The friction disc 1 (32) is fixedly mounted on one end of the screw rod 1 (7). The friction disc 4 (35) is fixedly mounted on the output shaft of the motor 1 (10). A driving device 1 (11) is provided on the frame (1) for driving the friction disc 1 (32) and the friction disc 4 (35) to move closer to or away from each other. When the friction disc 1 (32) and the friction disc 4 (35) are in contact with each other, the motor 1 (10) drives the screw rod 1 to move closer to or away from each other. (7) rotates around its own axis; a worm (26) parallel to and synchronously rotating with the pulley (28) is rotatably mounted on the frame (1); a worm wheel (25) coaxial with the worm (26) is rotatably mounted on the screw rod (7); the worm (26) engages with the worm wheel (25); the connecting assembly (2) also includes a friction disc (33) and a friction disc (34) that move synchronously; the friction disc (33) is fixedly connected to the worm wheel (25); a circular shaft (36) coaxial with the screw rod (7) is inserted into the screw rod (7); the friction disc (34) is connected to the circular shaft (36) via a connecting rod (12); the screw rod (7) has A sliding hole (38) is provided for the connecting rod 2 (12) to slide back and forth along the extending direction of the screw rod 1 (7); the round shaft 1 (36) extends out of the end of the screw rod 1 (7) and is rotatably connected to the output shaft of the motor 1 (10); when the friction disc 1 (32) and the friction disc 4 (35) are in contact, the friction disc 2 (33) and the friction disc 3 (34) are separated; when the friction disc 2 (33) and the friction disc 3 (34) are in contact, the friction disc 1 (32) and the friction disc 4 (35) are separated; the screw rod 1 (7) is provided with two, and the two screw rods 1 (7) rotate synchronously through the transmission belt 1 (9); a linear guide is provided between the two sliding mechanisms 1. The two linear guide rails (45) and the two screw rods (42) are fixedly connected to the sliding mechanism (1) at both ends, and the two screw rods (42) are rotatably assembled on the sliding mechanism (1). The sliding mechanism (2) is slidably assembled on the linear guide rails (45). The connection method between the sliding mechanism (2) and the two screw rods (42) is the same as the connection method between the sliding mechanism (1) and the one screw rod (7). The two screw rods (42) are driven by the two motors (43). The connection method between the two motors (43) and the two screw rods (42) is the same as the connection method between the one motor (10) and the one screw rod (7). The polishing mechanism is assembled on the two sliding mechanisms. ; 2. The device for polishing the surface of an injection mold cavity according to claim 1, characterized in that: The polishing mechanism comprises a polishing head (5) and a mounting frame (4); the polishing head (5) is detachably mounted on the mounting frame (4); a driving device (5) (44) is provided between the mounting frame (4) and the second sliding mechanism; the driving device (5) (44) is used to drive the mounting frame (4) to reciprocate in a direction perpendicular to both the first screw (7) and the second screw (42).

3. The device for polishing the surface of an injection mold cavity according to claim 2, characterized in that: The second transmission belt (24) and the pressure plate (27) are provided with a high friction coating.

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