A polishing device for injection mold guide pillars

Abstract

The application relates to the technical field of part polishing, in particular to a polishing device for an injection mold guide column. When the guide column is polished in the traditional polishing mode, the polishing efficiency is low, the guide column is prone to slight deviation and shaking during rotation, the polishing precision is poor, some different impurities may be attached to the surface of the guide column before and after polishing, the polishing is not uniform, the polishing quality is poor, and the polishing effect is affected. The polishing device for the injection mold guide column comprises the following: an outer frame; a support frame (2) fixedly connected to one side in the outer frame (1). The lock block is inserted into the clamping groove to lock the guide column on the chuck, the polishing disc is moved by the threaded shaft rotating through the threaded block to gradually polish the side surface of the guide column, the sliding frame drives the extrusion rod to extrude the inclined groove to move the polishing column, so that the top end port of the guide column can be polished synchronously while the side surface of the guide column is polished, the polishing speed is accelerated, and the polishing efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of parts polishing technology, and in particular to a polishing device for injection mold guide pillars. Background Technology

[0002] Guide pillars are one of the important components in molds, mainly used to ensure the alignment and stability of the two halves of the mold during the mold closing process. They work in conjunction with guide sleeves to ensure smooth operation of the mold during opening and closing. In order to improve the surface quality of the guide pillars and reduce wear between them and the guide sleeves, the sides and ends of the guide pillars are usually polished. The bottom of the guide pillars usually has a flat key and a slot for better installation. The traditional polishing method is to first lock the flat key and slot of the guide pillar with a locking device with a flat key and a locking block, and then use the unidirectional movement of the polishing machine to cooperate with the unidirectional rotation of the guide pillar. This can polish the side wall of the guide pillar. Finally, the ends of the guide pillars are polished manually.

[0003] Traditional polishing methods for guide posts require dividing the process into two parts: the side and the port. This results in low polishing efficiency. Furthermore, simply locking the bottom of the guide post can cause slight deviations and vibrations during rotation, leading to poor polishing precision on the side surface. Before polishing, the guide post surface may have some contaminants attached to it, and after polishing, static electricity may cause other impurities to adhere, resulting in uneven polishing and poor polishing quality, thus affecting the polishing effect. Summary of the Invention

[0004] To overcome the above-mentioned shortcomings, the present invention provides a polishing device for injection mold guide pillars, which can simultaneously polish the side and port of the guide pillar, improve polishing efficiency, and can hold the unlocked end of the guide pillar during polishing, making rotation more stable. It can also clean impurities on the polished and unpolished surfaces of the guide pillar, making the polishing more uniform and thus enhancing the polishing effect.

[0005] Technical solution: A polishing device for guide pillars of injection molds, comprising:

[0006] outer frame;

[0007] The support frame is fixed to one side of the outer frame;

[0008] The drive assembly is located between the outer frame and the support frame;

[0009] The bottom has a flat key guide post, which is installed on the drive assembly. The bottom side of the guide post has a ring of grooves.

[0010] The locking mechanism is located on the drive assembly;

[0011] The first polishing mechanism is located between the outer frame and the drive assembly;

[0012] The second polishing mechanism is located between the outer frame and the first polishing mechanism;

[0013] The locking mechanism locks the guide post onto the drive assembly. The drive assembly drives the guide post to rotate. At the same time, the drive assembly causes the first polishing mechanism to polish the side of the guide post. The first polishing mechanism drives the second polishing mechanism to polish the top end of the guide post synchronously.

[0014] As an improvement to the above solution, the drive assembly includes: a motor installed on one side of the bottom inside the outer frame; a chuck rotatably connected to the support frame and having a flat keyway, with the bottom end of the guide post inserted into the flat keyway of the chuck via a flat key; and a transmission assembly located between the motor and the chuck.

[0015] As an improvement to the above solution, the transmission assembly consists of two pulleys and a flat belt. The two pulleys are fixed to the output shaft of the motor and the chuck, respectively, and the flat belt is wound between the two pulleys.

[0016] As an improvement to the above solution, the locking mechanism includes: two locking blocks slidably connected to the two sides of the middle part of the chuck, with the sides of the two locking blocks close to each other inserted into the slots; two movable frames fixed to the top of the two locking blocks, each with a pressing groove, the two movable frames being slidably connected to the two sides of the upper inner part of the chuck; a pressing frame slidably connected to the top of the chuck, the top of the pressing frame protruding from the top of the chuck, the two ends of the pressing frame being slidably connected to the two pressing grooves; and a return spring connected between the bottom of the pressing frame and the chuck.

[0017] As an improvement to the above solution, the first polishing mechanism includes: a threaded shaft fixed to one end of the motor output shaft; two guide rails both fixed to the bottom of the outer frame; a sliding frame slidably connected between the two guide rails; a threaded block fixed to the bottom of the sliding frame and threadedly connected to the threaded shaft; a polishing machine mounted on the sliding frame; and a polishing disc fixed to the top of the output shaft of the polishing machine.

[0018] As an improvement to the above solution, the second polishing mechanism includes: a limiting frame fixed to the inner wall of the outer frame and having two piston chambers, each of the two piston chambers of the limiting frame having a through hole at the bottom; a piston rod slidably connected between the two piston chambers of the limiting frame; a pressure frame fixed to the end of the piston rod away from the limiting frame, the bottom of the pressure frame having a limiting groove; a pressing rod fixed to one side of the sliding frame and slidably connected to the limiting groove of the pressure frame; a second polishing machine installed on the top of the pressure frame; and a polishing column fixed to one end of the output shaft of the second polishing machine.

[0019] As an improvement to the above solution, the limiting groove of the pressure frame is composed of a slanted groove and a flat groove connected together, and the pressing rod is located in the slanted groove.

[0020] As an improvement to the above solution, a limiting mechanism is also included, located between the outer frame and the second polishing mechanism. The limiting mechanism includes: an arc-shaped frame fixed to the top of the outer frame and having an internal cavity; three movable frames slidably connected to the arc-shaped frame at even intervals, with the ends of the three movable frames protruding from the arc-shaped frame; three rollers rotatably connected to the ends of the three movable frames; and a three-pronged tube connecting the two through holes to one side of the cavity of the arc-shaped frame.

[0021] As an improvement to the above solution, a cleaning mechanism is also included, which is located between the sliding frame and the output shaft of the polishing machine. The cleaning mechanism includes: a limiting rod fixed to one side of the sliding frame; a vibrating frame slidably connected to the limiting rod; two brush strips respectively installed on the top sides of the vibrating frame for brushing off impurities; and an eccentric wheel fixed to the output shaft of the polishing machine, the eccentric wheel contacting the two sides of the vibrating frame.

[0022] The beneficial effects of this invention are as follows: 1. This invention moves the locking block by pressing the two pressing grooves with a pressing frame. The guide post is inserted into the flat keyway of the chuck through a flat key. The reset spring resets and drives the pressing frame to reset. Then, the locking block is reset through the pressing groove and inserted into the slot to lock the guide post on the chuck, making it less likely to fall off when the guide post rotates. The motor drives the guide post to rotate through the transmission assembly. Polishing machine one drives the polishing disc to rotate at high speed. The motor drives the threaded shaft to rotate and moves the polishing disc through the threaded block to gradually polish the side of the rotating guide post. Polishing machine two drives the polishing column to rotate at high speed. The sliding frame moves and drives the pressing rod to move. First, the pressing groove is pressed to move the polishing column. Then, the pressing rod enters the flat groove and the pressing frame stops moving. In this way, the top end of the guide post can be polished at the same time as the side of the guide post, thereby speeding up the polishing speed and improving the polishing efficiency.

[0023] 2. Before the polishing disc contacts the guide post, the piston rod moves while pushing the gas in the two piston chambers of the limiting frame into the cavity of the arc frame through the three-head tube. The increase in gas in the cavity of the arc frame will push the three sliding frames to move closer to the axis of the guide post. The movement of the three sliding frames will drive the three rollers to move together and press against the side wall at the top of the guide post, making the rotating guide post less prone to vibration, thereby making the subsequent polishing more stable, improving the polishing precision, and enhancing the polishing effect.

[0024] 3. The rotation of the output shaft of the polishing machine drives the eccentric wheel to rotate, causing the shaking frame to move back and forth along the limit rod, creating a shaking trend. The shaking of the shaking frame will drive the two brush strips to shake. The shaking of the two brush strips will brush off the impurities attached to the polished and unpolished sides of the guide post, thereby making the polishing of the guide post by the polishing disc more uniform and further enhancing the polishing effect. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0026] Figure 2 This is a cross-sectional three-dimensional structural diagram of the present invention.

[0027] Figure 3 This is a partial cross-sectional three-dimensional structural schematic diagram of the drive assembly and guide post of the present invention.

[0028] Figure 4 This is a partial cross-sectional three-dimensional structural diagram of the drive assembly, support frame, and guide post of the present invention.

[0029] Figure 5 This is a three-dimensional structural diagram showing the disassembled drive assembly, support frame, and guide post of the present invention.

[0030] Figure 6 This is a partial cross-sectional three-dimensional structural diagram of the chuck, guide post, and locking mechanism of the present invention.

[0031] Figure 7 This is a cross-sectional three-dimensional structural diagram of the chuck, guide post and locking mechanism of the present invention.

[0032] Figure 8 This is a three-dimensional structural diagram of the locking mechanism and guide post of the present invention.

[0033] Figure 9 This is a three-dimensional structural diagram of the drive assembly, the first polishing mechanism, and the cleaning mechanism of the present invention.

[0034] Figure 10 This is a partial three-dimensional structural diagram of the first polishing mechanism of the present invention.

[0035] Figure 11 This is a three-dimensional structural diagram of the first polishing mechanism of the present invention.

[0036] Figure 12 This is a partial three-dimensional structural diagram of the first polishing mechanism and cleaning mechanism of the present invention.

[0037] Figure 13 This is a three-dimensional structural diagram of the cleaning mechanism of the present invention.

[0038] Figure 14 This is a partial cross-sectional three-dimensional structural schematic diagram of the present invention.

[0039] Figure 15 This is a three-dimensional structural diagram of the sliding frame and the second polishing mechanism of the present invention.

[0040] Figure 16 This is a partial cross-sectional perspective view of the three-dimensional structure of the second polishing mechanism of the present invention.

[0041] Figure 17 This is a cross-sectional three-dimensional structural diagram of the limiting frame and piston rod of the present invention.

[0042] Figure 18 This is a three-dimensional structural diagram of the second polishing mechanism of the present invention.

[0043] Figure 19 This is a partial three-dimensional structural diagram of the second polishing mechanism, the limiting mechanism, and the guide post of the present invention.

[0044] Figure 20 This is a partial cross-sectional three-dimensional structural schematic diagram of the limiting mechanism and guide post of the present invention.

[0045] Figure 21 This is a cross-sectional three-dimensional structural diagram of the limiting mechanism and guide post of the present invention.

[0046] Figure 22 This is a schematic diagram of the split three-dimensional structure of the limiting mechanism of the present invention.

[0047] The diagram is labeled as follows: 0. Guide post, 00. Slot, 1. Outer frame, 2. Support frame, 31. Motor, 32. Chuck, 33. Transmission assembly, 41. Locking block, 42. Moving frame, 421. Extrusion groove, 43. Pressing frame, 44. Return spring, 51. Threaded shaft, 52. Guide rail, 53. Sliding frame, 54. Threaded block, 55. Polishing machine one, 56. Polishing disc, 61. Limiting frame, 611. Through hole, 62. Piston rod, 63. Pressure frame, 631. Inclined groove, 632. Flat groove, 64. Extrusion rod, 65. Polishing machine two, 66. Polishing column, 71. Arc frame, 72. Moving frame, 73. Roller, 74. Three-headed tube, 81. Limiting rod, 82. Vibrating frame, 83. Brush strip, 84. Eccentric wheel. Detailed Implementation

[0048] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0049] Example 1: A polishing device for guide pillars of injection molds, such as Figures 1-21 As shown, it includes:

[0050] Outer frame 1;

[0051] Support frame 2 is welded to one side of the inner frame 1;

[0052] The drive assembly is located between the outer frame 1 and the support frame 2;

[0053] A guide post 0 with a flat key at the bottom is mounted on a drive assembly. The drive assembly is used to drive the guide post 0 to rotate. A groove 00 is formed on the side of the bottom end of the guide post 0.

[0054] A locking mechanism is provided on the drive assembly to lock the guide post 0 onto the drive assembly via the slot 00.

[0055] The first polishing mechanism, used to polish the side of the guide post 0, is located between the outer frame 1 and the drive assembly.

[0056] The second polishing mechanism is used to simultaneously polish the top end of the guide post 0, and is located between the outer frame 1 and the first polishing mechanism.

[0057] First, the locking mechanism locks the guide post 0 onto the drive assembly via the slot 00. Then, the drive assembly drives the guide post 0 to rotate. At the same time, the drive assembly causes the first polishing mechanism to move laterally to gradually polish the side of the rotating guide post 0. While polishing the side of the guide post 0, the first polishing mechanism drives the second polishing mechanism to simultaneously polish the top end of the guide post 0, making the polishing speed faster and improving the polishing efficiency.

[0058] The drive assembly includes: a motor 31 installed on one side of the bottom inside the outer frame 1; a chuck 32 rotatably connected to the support frame 2 and having a flat keyway, the bottom end of the guide post 0 being inserted into the flat keyway of the chuck 32 through a flat key, the chuck 32 being used to drive the guide post 0 to rotate; and a transmission assembly 33 located between the motor 31 and the chuck 32.

[0059] The staff starts the motor 31. The output shaft of the motor 31 rotates, which drives the chuck 32 and the guide post 0 to rotate together through the transmission component 33. After polishing is completed, the staff turns off the motor 31.

[0060] The transmission assembly 33 consists of two pulleys and a flat belt. The two pulleys are connected to the output shaft of the motor 31 and the chuck 32 respectively via keyways, and the flat belt is wound between the two pulleys.

[0061] The locking mechanism includes: two locking blocks 41 slidably connected to the two sides of the middle part of the chuck 32 and used to lock the bottom end of the guide post 0, with the sides of the two locking blocks 41 close to each other inserted into the slot 00; two movable frames 42 respectively welded to the top of the two locking blocks 41 and each having a pressing groove 421, the two movable frames 42 being slidably connected to the upper inner sides of the chuck 32, the two pressing grooves 421 being symmetrically distributed; a pressing frame 43 slidably connected to the top of the chuck 32 and used for manual pressing, the top of the pressing frame 43 protruding from the top of the chuck 32, the two ends of the pressing frame 43 being slidably connected to the two pressing grooves 421 respectively; and a return spring 44 connected between the bottom of the pressing frame 43 and the chuck 32.

[0062] When it is necessary to lock the guide post 0, the operator first presses down the pressing bracket 43 to squeeze the two pressing grooves 421, causing the two moving brackets 42 to move away from each other. The return spring 44 is compressed, and the movement of the two moving brackets 42 will drive the two locking blocks 41 to move away from each other. At the same time, the operator inserts the guide post 0 to be polished into the keyway of the chuck 32 through the key. Then the operator releases the pressing bracket 43, and the return spring 44 returns to its original position, causing the pressing bracket 43 to return to its original position. Then, the two moving brackets 42 and the two locking blocks 41 return to their original positions through the two pressing grooves 421. After the two locking blocks 41 return to their original positions, they will be inserted into the two sides of the chuck 00, thereby locking the guide post 0 on the chuck 32, so that the guide post 0 will not fall off when rotating. After polishing is completed, after the motor 31 is turned off, the operator repeats the above operation to remove the polished guide post 0.

[0063] The first polishing mechanism includes: a threaded shaft 51 connected to one end of the output shaft of the motor 31 via a coupling; two guide rails 52, both bolted to the bottom of the inner frame 1; a sliding frame 53 slidably connected between the two guide rails 52; a threaded block 54 bolted to the bottom of the sliding frame 53 and threadedly connected to the threaded shaft 51; a polishing machine 55 mounted on the sliding frame 53; and a polishing disc 56 connected to the top of the output shaft of the polishing machine 55 via a keyway for polishing the side of the guide post 0.

[0064] Before starting the drive motor 31, the operator first starts the polishing machine 55. The polishing machine 55 drives the polishing disc 56 to rotate at high speed. Then, the output shaft of the motor 31 drives the threaded shaft 51 to rotate. The rotation of the threaded shaft 51 will drive the sliding frame 53, the polishing machine 55 and the polishing disc 56 to move together along the two guide rails 52 through the threaded block 54. When the high-speed rotating polishing disc 56 moves, it will slowly pass over the side of the rotating guide post 0, and then gradually polish the side of the rotating guide post 0. Then, the motor 31 drives the threaded shaft 51 and the guide post 0 to rotate in the opposite direction. The reverse rotation of the threaded shaft 51 will cause the sliding frame 53, the polishing machine 55 and the polishing disc 56 to move in the opposite direction and reset. After polishing is completed, the operator turns off the polishing machine 55.

[0065] The second polishing mechanism includes: a limiting frame 61 bolted to the inner wall of the outer frame 1 and having two piston chambers, with through holes 611 on the bottom of one side of each piston chamber; a piston rod 62 slidably connected between the two piston chambers of the limiting frame 61; a pressure frame 63 welded to the end of the piston rod 62 away from the limiting frame 61, with a limiting groove at the bottom of the pressure frame 63; a pressing rod 64 welded to one side of the sliding frame 53 and slidably connected to the limiting groove of the pressure frame 63, the pressing rod 64 being used to press the limiting groove to move the pressure frame 63; a second polishing machine 65 mounted on the top of the pressure frame 63; and a polishing column 66 connected to one end of the output shaft of the second polishing machine 65 via a keyway, the polishing column 66 being used to polish the top end of the guide column 0.

[0066] The limiting groove of the pressure frame 63 is composed of a inclined groove 631 and a flat groove 632 connected together, and the pressing rod 64 is located in the inclined groove 631;

[0067] When polishing guide post 0 is required, polishing machine 1 (55) and polishing machine 2 (65) are started simultaneously. Polishing machine 2 (65) drives polishing column 66 to rotate at high speed. During the movement of sliding frame 53, it drives extrusion rod 64 to move. Extrusion rod 64 first extrudes inclined groove 631, causing pressure frame 63 and piston rod 62 to move together along the two piston chambers of limit frame 61 towards guide post 0. This, in turn, drives polishing machine 2 (65) and polishing column 66 to move together. The end of polishing column 66 that is away from polishing machine 2 (65) moves to the center position of the top port of guide post 0 and makes contact. At the same time, extrusion rod 64 enters flat groove 63. Within 2, the pressure frame 63 stops moving, and the polishing disc 56 is in contact with the side of the guide post 0. While the guide post 0 rotates, the high-speed rotating polishing column 66 gradually polishes the top end of the guide post 0. In this way, the top end of the guide post 0 can be polished simultaneously while the side of the guide post 0 is polished, thereby speeding up the polishing speed and improving the polishing efficiency. When the sliding frame 53 resets, it drives the extrusion rod 64 to reset and extrudes the inclined groove 631 again, so that the pressure frame 63, polishing machine 2 65, piston rod 62 and polishing column 66 reset together. After polishing is completed, the operator turns off polishing machine 1 55 and polishing machine 2 65 at the same time.

[0068] Example 2: Based on Example 1, such as Figures 1-2 and Figures 19-22As shown, it also includes a limiting mechanism for stabilizing the rotation of the guide post 0, located between the outer frame 1 and the second polishing mechanism. The limiting mechanism includes: an arc-shaped frame 71 welded to the top of the outer frame 1 and having an internal cavity, the arc-shaped frame 71 being located on one side of the top of the guide post 0; three movable frames 72 slidably connected to the arc-shaped frame 71 at even intervals, the ends of the three movable frames 72 extending close to each other through the arc-shaped frame 71; three rollers 73 rotatably connected to the ends of the three movable frames 72, respectively, for abutting against the top sidewall of the guide post 0; and a three-pronged tube 74 connecting the two through holes 611 to one side of the cavity of the arc-shaped frame 71.

[0069] Before the polishing disc 56 contacts the guide post 0, the piston rod 62 moves while pushing the gas in the two piston chambers of the limiting frame 61 into the cavity of the arc frame 71 through the three-head tube 74. The increase in gas in the cavity of the arc frame 71 pushes the three sliding frames to move closer to the axis of the guide post 0. The movement of the three sliding frames will drive the three rollers 73 to move together and abut against the side wall at the top of the guide post 0, making the rotating guide post 0 less prone to shaking, thereby making the subsequent polishing more stable, improving the polishing accuracy, and enhancing the polishing effect. When the piston rod 62 resets, it will draw the gas in the cavity of the arc frame 71 back into the two piston chambers of the limiting frame 61 through the three-head tube 74, thereby reducing the gas in the cavity of the arc frame 71 and drawing the three sliding frames to reset, thereby driving the three rollers 73 to reset and disengage from the guide post 0.

[0070] Example 3: Based on Example 2, such as Figures 2-13 As shown, it also includes a cleaning mechanism for cleaning impurities attached to the polished and unpolished sides of the guide post 0, respectively. It is located between the sliding frame 53 and the output shaft of the polishing machine 55. The cleaning mechanism includes: a limiting rod 81 welded to one side of the sliding frame 53; a vibrating frame 82 slidably connected to the limiting rod 81; two brush strips 83 respectively installed on both sides of the top of the vibrating frame 82 for brushing off impurities; and an eccentric wheel 84 connected to the output shaft of the polishing machine 55 via a keyway. The eccentric wheel 84 contacts both sides of the vibrating frame 82 and is used to squeeze the vibrating frame 82 to move.

[0071] As the sliding frame 53 moves, it drives the cleaning mechanism to move as well, causing the two brush strips 83 to contact the sides of the guide post 0. The rotation of the output shaft of the polishing machine 55 drives the eccentric wheel 84 to rotate. The rotation of the eccentric wheel 84 will squeeze the two sides of the shaking frame 82 one after the other, causing the shaking frame 82 to move back and forth along the limit rod 81 to form a shaking trend. The shaking of the shaking frame 82 will drive the two brush strips 83 to shake. The shaking of the two brush strips 83 will brush off the impurities attached to the polished and unpolished sides of the guide post 0, respectively, so that the polishing disc 56 polishes the guide post 0 more evenly, thereby further enhancing the polishing effect.

[0072] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes made to the content described in the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A polishing device for guide pillars of injection molds, characterized in that, include: Outer frame (1); The support frame (2) is fixed to one side of the outer frame (1); The drive assembly is located between the outer frame (1) and the support frame (2); A guide post (0) with a flat key at the bottom is installed on the drive assembly. A groove (00) is opened on the side of the bottom end of the guide post (0). The locking mechanism is located on the drive assembly; The first polishing mechanism is located between the outer frame (1) and the drive assembly; The second polishing mechanism is located between the outer frame (1) and the first polishing mechanism; The locking mechanism locks the guide post (0) onto the drive assembly. The drive assembly drives the guide post (0) to rotate. At the same time, the drive assembly causes the first polishing mechanism to polish the side of the guide post (0). The first polishing mechanism drives the second polishing mechanism to polish the top end of the guide post (0) synchronously. The drive assembly includes: a motor (31) installed on one side of the bottom inside the outer frame (1); a chuck (32) rotatably connected to the support frame (2) and having a keyway, with the bottom end of the guide post (0) inserted into the keyway of the chuck (32) via a keyway; and a transmission assembly (33) located between the motor (31) and the chuck (32). The locking mechanism includes: two locking blocks (41) slidably connected to the two sides of the middle part of the chuck (32), with the sides of the two locking blocks (41) close to each other inserted into the slots (00); two movable frames (42) fixed to the top of the two locking blocks (41) and each having a pressing groove (421), the two movable frames (42) being slidably connected to the upper inner sides of the chuck (32); a pressing frame (43) slidably connected to the top of the chuck (32), the top of the pressing frame (43) protruding from the top of the chuck (32), and both ends of the pressing frame (43) being slidably connected to the two pressing grooves (421); and a return spring (44) connected between the bottom of the pressing frame (43) and the chuck (32). The first polishing mechanism includes: a threaded shaft (51) fixed to one end of the output shaft of the motor (31); two guide rails (52) both fixed to the bottom of the inner frame (1); a sliding frame (53) slidably connected between the two guide rails (52); a threaded block (54) fixed to the bottom of the sliding frame (53) and threadedly connected to the threaded shaft (51); a polishing machine (55) mounted on the sliding frame (53); and a polishing disc (56) fixed to the top of the output shaft of the polishing machine (55). The second polishing mechanism includes: a limiting frame (61) fixed to the inner wall of the outer frame (1) and having two piston chambers, wherein each of the two piston chambers of the limiting frame (61) has a through hole (611) at the bottom of one side; a piston rod (62) slidably connected between the two piston chambers of the limiting frame (61); a pressure frame (63) fixedly connected to one end of the piston rod (62) away from the limiting frame (61), wherein the bottom of the pressure frame (63) has a limiting groove; a pressing rod (64) fixedly connected to one side of the sliding frame (53) and slidably connected to the limiting groove of the pressure frame (63); a second polishing machine (65) installed on the top of the pressure frame (63); and a polishing column (66) fixedly connected to one end of the output shaft of the second polishing machine (65). The limiting groove of the pressure frame (63) is composed of a slanted groove (631) and a flat groove (632) connected together, and the pressing rod (64) is located in the slanted groove (631).

2. The polishing device for injection mold guide pillars as described in claim 1, characterized in that, The transmission assembly (33) consists of two pulleys and a flat belt. The two pulleys are fixed to the output shaft of the motor (31) and the chuck (32) respectively, and the flat belt is wound between the two pulleys.

3. The polishing device for injection mold guide pillars as described in claim 1, characterized in that, It also includes a limiting mechanism located between the outer frame (1) and the second polishing mechanism. The limiting mechanism includes: an arc-shaped frame (71) fixed to the top of the outer frame (1) and having an internal cavity; three movable frames (72) slidably connected to the arc-shaped frame (71) at even intervals, with the ends of the three movable frames (72) extending out of the arc-shaped frame (71); three rollers (73) rotatably connected to the ends of the three movable frames (72) extending out of each other; and a three-headed tube (74) connecting the two through holes (611) to one side of the cavity of the arc-shaped frame (71).

4. The polishing device for injection mold guide pillars as described in claim 1, characterized in that, It also includes a cleaning mechanism located between the sliding frame (53) and the output shaft of the polishing machine (55). The cleaning mechanism includes: a limiting rod (81) fixed to one side of the sliding frame (53); a vibrating frame (82) slidably connected to the limiting rod (81); two brush strips (83) respectively installed on the top sides of the vibrating frame (82) for brushing off impurities; and an eccentric wheel (84) fixed to the output shaft of the polishing machine (55), the eccentric wheel (84) contacting the two sides of the vibrating frame (82).

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