Die inner hole polishing device

Abstract

The utility model relates to the technical field of deep hole polishing, in particular to a die inner hole polishing device. The mold inner hole polishing device comprises a rack, a clamping mechanism, a moving mechanism and a polishing piece, and the clamping mechanism is arranged on the rack and used for clamping a mold; the moving mechanism comprises two pressing assemblies and a first driving assembly, the two pressing assemblies are slidably arranged at the two ends of the rack correspondingly, the clamping mechanism is located between the two pressing assemblies, and the first driving assembly is configured to drive the two pressing assemblies to move in the same direction at the same time; the polishing piece can penetrate through an inner hole of the mold, the two ends of the polishing piece are connected with the two pressing assemblies correspondingly, and the two pressing assemblies can drive the polishing piece to move in the length direction of the inner hole of the mold. Compared with the prior art, the polishing device can reduce errors caused by manual polishing, improve polishing precision and polishing efficiency and improve the percent of pass of the die.

Description

Technical Field

[0001] The utility model relates to the technical field of deep hole polishing, in particular to a polishing device for the inner hole of a mold. Background Art

[0002] At present, for the polishing of the inner hole of a tungsten steel pressing mold on the market, manual polishing with a pneumatic grinding head is mostly used, which has low polishing efficiency, great polishing difficulty, poor polishing accuracy, and is prone to over-polishing or incomplete polishing of the pressing mold, reducing the qualified rate of the mold.

[0003] Therefore, there is an urgent need for a polishing device for the inner hole of a mold to solve the above technical problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a polishing device for the inner hole of a mold, which can improve the polishing efficiency, polishing accuracy, and qualified rate of the mold.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A polishing device for the inner hole of a mold, comprising:

[0007] A frame;

[0008] A clamping mechanism, which is arranged on the frame and is used for clamping the mold;

[0009] A moving mechanism, which includes two pressing components and a first driving component. The two pressing components are respectively slidably arranged at both ends of the frame, and the clamping mechanism is located between the two pressing components. The first driving component is configured to simultaneously drive the two pressing components to move in the same direction;

[0010] A polishing piece, which can pass through the inner hole of the mold, and both ends of the polishing piece are respectively connected to the two pressing components. The two pressing components can drive the polishing piece to move along the length direction of the inner hole of the mold.

[0011] As a preferred technical solution of the above polishing device for the inner hole of a mold, the first driving component includes a first driving member, a driving wheel, two driven wheels and a chain. The first driving member is arranged on the frame, the driving wheel is rotatably connected to the frame, and the first driving member is in transmission connection with the driving wheel. The two driven wheels are respectively rotatably connected to both ends of the frame. The chain is wound around the driving wheel and the two driven wheels, and both ends of the chain are respectively connected to the two pressing components.

[0012] As a preferred technical solution of the above-mentioned inner hole polishing device for a mold, the inner hole polishing device for a mold further includes a guiding seat and a first guiding rod. The guiding seat is fixed to the machine frame. The first guiding rod passes through the guiding seat, and the first guiding rod is slidably connected to the guiding seat. Two ends of the first guiding rod are respectively connected to the two pressing assemblies.

[0013] As a preferred technical solution of the above-mentioned inner hole polishing device for a mold, the pressing assembly includes a pressing seat, an upper pressing block, and a lower pressing block. The pressing seat is slidably arranged on the machine frame. The lower pressing block is fixed to the pressing seat. The upper pressing block is slidably arranged on the pressing seat. The upper pressing block can abut against the lower pressing block and is used for pressing the polishing piece.

[0014] As a preferred technical solution of the above-mentioned inner hole polishing device for a mold, the inner hole polishing device for a mold further includes a lifting mechanism. The lifting mechanism is arranged between the machine frame and the clamping mechanism. The lifting mechanism can drive the clamping mechanism to move in the vertical direction.

[0015] As a preferred technical solution of the above-mentioned inner hole polishing device for a mold, the lifting mechanism includes a lifting rod, a mounting plate, a lead screw, and a second driving member. One end of the lifting rod passes through the machine frame and is connected to the clamping mechanism. The lifting rod is slidably connected to the machine frame. The other end of the lifting rod is connected to the mounting plate. One end of the lead screw is threadedly connected to the mounting plate. The other end of the lead screw is drivingly connected to the second driving member. The mounting plate is slidably connected to the machine frame. The second driving member is used for driving the lead screw to rotate.

[0016] As a preferred technical solution of the above-mentioned inner hole polishing device for a mold, the lifting mechanism further includes a coupling. Two ends of the coupling are respectively connected to the second driving member and the lead screw.

[0017] As a preferred technical solution of the above-mentioned inner hole polishing device for a mold, the second driving member is a servo motor.

[0018] As a preferred technical solution of the above-mentioned inner hole polishing device for a mold, the lifting mechanism further includes a bushing. The bushing is arranged on the machine frame. One end of the lifting rod can pass through the bushing, and the lifting rod is slidably connected to the bushing.

[0019] As a preferred technical solution of the above-mentioned inner hole polishing device for a mold, the polishing piece is a polishing cloth strip.

[0020] Advantages of the present utility model:

[0021] The utility model provides a polishing device for the inner hole of a mold. The polishing device for the inner hole of a mold includes: a frame, a clamping mechanism, a moving mechanism, and a polishing member. The clamping mechanism is arranged on the frame and is used for clamping the mold. The moving mechanism includes two pressing components and a first driving component. The two pressing components are respectively slidably arranged at both ends of the frame, and the clamping mechanism is located between the two pressing components. The first driving component is configured to simultaneously drive the two pressing components to move in the same direction. The polishing member can pass through the inner hole of the mold, and both ends of the polishing member are respectively connected to the two pressing components. The two pressing components can drive the polishing member to move along the length direction of the inner hole of the mold. Compared with the prior art, this polishing device can reduce the error of manual polishing, improve the polishing accuracy and efficiency, and improve the qualification rate of the mold. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0023] Figure 1 Structural schematic diagram of the polishing device for the inner hole of the mold provided by the embodiment of the present utility model Figure 1 ;

[0024] Figure 2 Structural schematic diagram of the polishing device for the inner hole of the mold provided by the embodiment of the present utility model Figure 2 ;

[0025] Figure 3 Structural schematic diagram of the polishing device for the inner hole of the mold provided by the embodiment of the present utility model Figure 3 ;

[0026] Figure 4 Structural schematic diagram of the lifting mechanism provided by the embodiment of the present utility model.

[0027] In the figure:

[0028] 1. Frame; 101. First through hole; 102. Second through hole; 2. Clamping mechanism; 3. Pressing component; 31. Pressing seat; 32. Upper pressing block; 33. Lower pressing block; 34. Third guide rod; 4. First driving member; 5. Driving wheel; 6. Driven wheel; 7. Guide seat; 8. First guide rod; 9. Lifting mechanism; 91. Lifting rod; 92. Mounting plate; 93. Lead screw; 94. Second driving member; 95. Coupling; 96. Bushing; 97. Nut; 98. Fixed frame; 99. Fixed plate; 10. Mounting seat; 11. Protective cover; 12. Guide block; 13. Second guide rod; 14. Side plate; 15. Mold. Detailed implementation manners

[0029] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0030] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0032] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0033] As Figures 1 to 3 shown, the present utility model provides a polishing device for the inner hole of a mold. The polishing device for the inner hole of a mold includes: a frame 1, a clamping mechanism 2, a moving mechanism, and a polishing member.

[0034] Specifically, the clamping mechanism 2 is arranged on the frame 1 and is used for clamping the mold 15; the moving mechanism includes two pressing components 3 and a first driving component. The two pressing components 3 are respectively slidably arranged at both ends of the frame 1, and the clamping mechanism 2 is located between the two pressing components 3. The first driving component is configured to drive the two pressing components 3 to move in the same direction simultaneously; the polishing piece can pass through the inner hole of the mold 15, and both ends of the polishing piece are respectively connected to the two pressing components 3, and the two pressing components 3 can drive the polishing piece to move along the length direction of the inner hole of the mold 15. Compared with the prior art, this polishing device can reduce the error of manual polishing, improve the polishing accuracy and efficiency, and improve the qualification rate of the mold 15. Further, the polishing piece is a polishing cloth strip.

[0035] Optionally, the first driving component includes a first driving member 4, a driving wheel 5, two driven wheels 6 and a chain. The first driving member 4 is arranged on the frame 1, the driving wheel 5 is rotatably connected to the frame 1, and the first driving member 4 is in transmission connection with the driving wheel 5. The two driven wheels 6 are respectively rotatably connected to both ends of the frame 1. The chain is wound around the driving wheel 5 and the two driven wheels 6, and both ends of the chain are respectively connected to the two pressing components 3. Specifically, in this embodiment, the first driving component is provided with five driven wheels 6. The first driving member 4 is arranged at the bottom of the frame 1. The two driven wheels 6 are respectively rotatably connected to both ends of the top of the frame 1. The three driven wheels 6 are rotatably connected to the bottom of the frame 1 at intervals, and two of the driven wheels 6 are respectively rotatably connected to both ends of the bottom of the frame 1, and the other driven wheel 6 is arranged between the two driven wheels 6. The chain is wound around the driving wheel 5 and the five driven wheels 6. In this way, the rotation of the first driving member 4 at the bottom of the frame 1 can be converted into the horizontal movement of the chain at the top of the frame 1. It should be noted that both the driving wheel 5 and the driven wheels 6 are sprockets, which can improve the efficiency of the polishing device and prevent idling. Of course, in some other embodiments, the number of the driven wheels 6 is determined according to the actual situation, which will not be elaborated here.

[0036] Further, the mold inner hole polishing device further includes six mounting seats 10. The six mounting seats 10 are all fixed on the frame 1, and the driving wheel 5 and the five driven wheels 6 are all rotatably connected to the corresponding mounting seats 10, which improves the stability of the driving wheel 5 and the driven wheels 6.

[0037] Further, the first driving member 4 is a servo motor, and the torque is amplified by a reduction gearbox and transmitted to the clamping mechanism 2 that clamps the polishing cloth strip through the chain, so as to realize the reciprocating movement of the polishing cloth strip in the inner hole of the mold 15 for polishing. The polishing efficiency is high, the polishing speed can reach up to 200 mm / s at most, and the polishing accuracy can reach ±0.02 mm, so as to realize the effect of quickly polishing the pressing mold 15.

[0038] Optionally, the die inner hole polishing device further includes two protective covers 11, which are arranged in one-to-one correspondence with the two driven wheels 6 at the top of the frame 1. The protective covers 11 are installed on the frame 1 and cover the driven wheels 6 inside the protective covers 11, which can protect the driven wheels 6 and prevent the driven wheels 6 from being damaged.

[0039] Optionally, first through holes 101 are provided on the left and right side walls of the frame 1, and both ends of the chain can pass through the corresponding first through holes 101 to be connected to the two driven wheels 6 at the top of the frame 1, preventing the frame 1 from interfering with the movement of the chain.

[0040] Optionally, the die inner hole polishing device further includes a guide seat 7 and a first guide rod 8. The guide seat 7 is fixed to the upper surface of the top wall of the frame 1. The first guide rod 8 is passed through the guide seat 7, and the first guide rod 8 is slidably connected to the guide seat 7. Both ends of the first guide rod 8 are respectively connected to the tops of the two pressing assemblies 3, which can make the two pressing assemblies 3 move along the length direction of the first guide rod 8, prevent the polishing cloth strip from shifting, and ensure the polishing accuracy. Further, the die inner hole polishing device further includes a guide block 12 and a second guide rod 13. The guide block 12 is fixed to the lower surface of the top wall of the frame 1. Two second through holes 102 are provided on the top wall of the frame 1. The bottoms of the two pressing assemblies 3 respectively pass through the corresponding second through holes 102. The second guide rod 13 is passed through the guide block 12, and the second guide rod 13 is slidably connected to the guide block 12. Both ends of the second guide rod 13 are respectively connected to the bottoms of the two pressing assemblies 3, which can make the two pressing assemblies 3 move along the length direction of the second guide rod 13, and can further improve the movement stability of the two pressing assemblies 3 and further improve the polishing accuracy.

[0041] Optionally, the pressing assembly 3 includes a pressing seat 31, an upper pressing block 32 and a lower pressing block 33. The pressing seat 31 is slidably arranged on the frame 1. The lower pressing block 33 is fixed to the pressing seat 31. The upper pressing block 32 is slidably arranged on the pressing seat 31. The upper pressing block 32 can abut against the lower pressing block 33 and is used for pressing the polishing part. Both the upper pressing block 32 and the lower pressing block 33 are provided with sawteeth that can bite with each other, which can improve the clamping force on the polishing cloth strip and prevent the polishing cloth strip from falling off.

[0042] Further, the pressing assembly 3 further includes a third guide rod 34. The third guide rod 34 is arranged on the pressing seat 31. The third guide rod passes through the upper pressing block 32, and the upper pressing block 32 can move along the length direction of the third guide rod 34, so that the upper pressing block 32 and the lower pressing block 33 are precisely engaged, ensuring the firm connection between the polishing cloth strip and the pressing assembly 3. In this embodiment, four third guide rods 34 are provided for the pressing assembly 3. The four third guide rods 34 are respectively slidably connected to the four corners of the upper pressing block 32, which can make the upper pressing block 32 stably move along the length direction of the third guide rod 34. Of course, in some other embodiments, the number of the third guide rods 34 is determined according to the actual situation and will not be elaborated here.

[0043] Optionally, as Figure 4 shown, the inner hole polishing device of the mold further includes a lifting mechanism 9. The lifting mechanism 9 is arranged between the frame 1 and the clamping mechanism 2. The lifting mechanism 9 can drive the clamping mechanism 2 to move in the vertical direction. By adjusting the height of the clamping mechanism 2, the mold 15 is further adjusted so that the height of the inner hole of the mold 15 is consistent with the height of the polishing cloth strip, ensuring the polishing accuracy of the polishing device; and it can be compatible with pressing molds 15 of various specifications, avoiding the phenomenon that the inner hole of the mold 15 is not centered after clamping, resulting in the deviation of the inner hole of the mold 15 after polishing, etc.

[0044] Further, the lifting mechanism 9 includes a lifting rod 91, a mounting plate 92, a lead screw 93 and a second driving member 94. One end of the lifting rod 91 passes through the top wall of the frame 1 and is connected to the clamping mechanism 2. The lifting rod 91 is slidably connected to the frame 1. The other end of the lifting rod 91 is connected to the mounting plate 92. One end of the lead screw 93 is threadedly connected to the mounting plate 92. The other end of the lead screw 93 is drivingly connected to the second driving member 94. The mounting plate 92 is slidably connected to the frame 1. The second driving member 94 is used to drive the lead screw 93 to rotate. Specifically, in this embodiment, four lifting rods 91 are provided for the lifting mechanism 9. The four lifting rods 91 are respectively connected to the four corners of the clamping mechanism 2, which can improve the stability of the clamping mechanism 2. The second driving member 94 driving the lead screw 93 to rotate can make the mounting plate 92 move relative to the frame 1 along the length direction of the lead screw 93, so that the mounting plate 92 drives the lifting rod 91 to move, and further can change the height of the clamping mechanism 2, making the height of the inner hole of the mold 15 consistent with the height of the polishing cloth strip, improving the versatility of the inner hole polishing device of the mold. Of course, in some other embodiments, the number of the lifting rods 91 is determined according to the actual situation and will not be elaborated here. Further, the second driving member 94 is a servo motor. Driven by the servo motor, through the way of chain drive combined with the control program, parameters are set on the touch screen to achieve different polishing speeds to meet the requirements of rough polishing or fine polishing of different molds 15. For different models of molds 15, parameters can be stored, and the corresponding model parameters can be directly selected when used next time. The lifting mechanism 9 will automatically adjust to the parameter position to achieve automatic centering, ensuring the polishing speed of the equipment. Still further, the lifting mechanism 9 further includes a nut 97. The nut 97 is fixed to the mounting plate 92. The lead screw 93 is threadedly connected to the nut 97.

[0045] Optionally, the lifting mechanism 9 further includes a coupling 95. The two ends of the coupling 95 are respectively connected to the second driving member 94 and the lead screw 93. Specifically, the second driving member 94 is horizontally arranged, and the lead screw 93 is vertically arranged. By using the coupling 95, the transmission direction can be changed, and at the same time, the lead screw 93 can be prevented from bearing excessive loads, improving the service life of the inner hole polishing device of the mold.

[0046] Optionally, the lifting mechanism 9 further includes a bushing 96. The bushing 96 is disposed on the frame 1. One end of the lifting rod 91 can pass through the bushing 96, and the lifting rod 91 is slidably connected to the bushing 96. Specifically, the lifting mechanism 9 further includes a bushing 96 and a fixing plate 99. The fixing plate 99 is fixedly installed on the frame 1, and the bushing 96 is fixed to the fixing plate 99. In this embodiment, four bushings 96 are provided in the lifting mechanism 9, which are respectively fixed at the four corners of the fixing plate 99. The lifting rod 91 slidably passes through the bushing 96, which can play a guiding role for the lifting rod 91 and reduce the sliding friction force on the lifting rod 91. Of course, in some other embodiments, the number of bushings 96 is determined according to the number of lifting rods 91, which will not be elaborated here.

[0047] Optionally, the lifting mechanism 9 further includes a fixing frame 98. The fixing frame 98 is installed on the fixing plate 99, and the second driving member 94 is installed on the fixing frame 98, which can improve the stability of the second driving member 94. Further, one end of the fixing frame 98 slidably passes through the mounting plate 92 and is connected to the fixing plate 99.

[0048] Optionally, the mold inner hole polishing device further includes a side plate 14. The side plate 14 is detachably connected to the frame 1 and is used to cover the front and rear sides of the frame 1, and the first driving member 4 and the second driving member 94 are arranged inside the frame 1 to prevent the first driving member 4 and the second driving member 94 from being damaged.

[0049] The using process of the mold inner hole polishing device provided by the present utility model is as follows:

[0050] 1. Clamp the mold 15 to be polished on the clamping mechanism 2, set the model parameters of the mold 15, and enable the lifting mechanism 9 to achieve automatic lifting and centering;

[0051] 2. The pressing assembly 3 clamps one end of the polishing piece, and the other end passes through the inner hole of the mold 15 and is clamped by the pressing assembly 3 at the other end. Add polishing liquid to the polishing piece and set relevant operating parameters (polishing distance, polishing speed, and number of polishing times);

[0052] 3. Press the start switch to operate the mold inner hole polishing device. The control program controls the forward and reverse rotation of the first driving member 4, and drives the polishing piece to reciprocate on the central hole of the mold 15 through the chain to polish the mold 15. After reaching the number of polishing times, the first driving member 4 automatically stops;

[0053] 4. After polishing is completed, loosen the pressing assembly 3, remove one end of the polishing piece, and manually remove the mold 15.

[0054] In addition, the above are only the preferred embodiments of the present utility model and the applied technical principles. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in relatively detail through the above embodiments, the present utility model is not limited to the above embodiments. Without departing from the concept of the present utility model, it can also include more other equivalent embodiments, and the scope of the present utility model is determined by the scope of the appended claims.

Claims

1. An inner hole polishing device for a mold, characterized in that, Comprising: A frame (1); A clamping mechanism (2), which is arranged on the frame (1) and is used for clamping a mold (15); A moving mechanism, the moving mechanism includes two pressing components (3) and a first driving component. The two pressing components (3) are respectively slidably arranged at both ends of the frame (1), and the clamping mechanism (2) is located between the two pressing components (3). The first driving component is configured to simultaneously drive the two pressing components (3) to move in the same direction; A polishing piece, which can pass through the inner hole of the mold (15), and both ends of the polishing piece are respectively connected to the two pressing components (3). The two pressing components (3) can drive the polishing piece to move along the length direction of the inner hole of the mold (15).

2. The inner hole polishing device of a mold according to claim 1, characterized in that The first driving component includes a first driving member (4), a driving wheel (5), two driven wheels (6) and a chain. The first driving member (4) is arranged on the frame (1), the driving wheel (5) is rotatably connected to the frame (1), and the first driving member (4) is in transmission connection with the driving wheel (5). The two driven wheels (6) are respectively rotatably connected to both ends of the frame (1). The chain is wound around the driving wheel (5) and the two driven wheels (6), and both ends of the chain are respectively connected to the two pressing components (3).

3. A polishing device for the inner hole of a mold according to claim 1, characterized in that, The mold inner hole polishing device further includes a guiding seat (7) and a first guiding rod (8). The guiding seat (7) is fixed to the frame (1), the first guiding rod (8) passes through the guiding seat (7), and the first guiding rod (8) is slidably connected to the guiding seat (7). Both ends of the first guiding rod (8) are respectively connected to the two pressing components (3).

4. A polishing device for the inner hole of a mold according to claim 1, characterized in that The pressing component (3) includes a pressing seat (31), an upper pressing block (32) and a lower pressing block (33). The pressing seat (31) is slidably arranged on the frame (1), the lower pressing block (33) is fixed to the pressing seat (31), the upper pressing block (32) is slidably arranged on the pressing seat (31), and the upper pressing block (32) can abut against the lower pressing block (33) and is used for pressing the polishing piece.

5. A polishing device for the inner hole of a mold according to claim 1, characterized in that, The mold inner hole polishing device further includes a lifting mechanism (9), which is arranged between the frame (1) and the clamping mechanism (2). The lifting mechanism (9) can drive the clamping mechanism (2) to move in the vertical direction.

6. The inner hole polishing device of a mold according to claim 5, characterized in that, The lifting mechanism (9) includes a lifting rod (91), a mounting plate (92), a lead screw (93), and a second driving member (94). One end of the lifting rod (91) passes through the frame (1) and is connected to the clamping mechanism (2). The lifting rod (91) is slidably connected to the frame (1). The other end of the lifting rod (91) is connected to the mounting plate (92). One end of the lead screw (93) is threadedly connected to the mounting plate (92), and the other end of the lead screw (93) is drivingly connected to the second driving member (94). The mounting plate (92) is slidably connected to the frame (1), and the second driving member (94) is used to drive the lead screw (93) to rotate.

7. A polishing device for the inner hole of a mold according to claim 6, characterized in that, The lifting mechanism (9) further includes a coupling (95), and both ends of the coupling (95) are respectively connected to the second driving member (94) and the lead screw (93).

8. The inner hole polishing device of a mold according to claim 6, characterized in that, The second driving member (94) is a servo motor.

9. A polishing device for the inner hole of a mold according to claim 6, characterized in that, The lifting mechanism (9) further includes a bushing (96). The bushing (96) is disposed on the frame (1). One end of the lifting rod (91) can pass through the bushing (96), and the lifting rod (91) is slidably connected to the bushing (96).

10. A polishing device for the inner hole of a mold according to any one of claims 1-9, characterized in that, The polishing member is a polishing cloth strip.

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