Polishing powder grading equipment capable of improving grading precision

Abstract

The utility model discloses polishing powder grading equipment for improving grading precision, which comprises a base, a grading mechanism is arranged on the base, the grading mechanism comprises a lower shell, an upper shell, a vibration spring, a vibration motor, a mounting ring and a sieve plate, the lower shell is arranged on the base, the upper shell is arranged on the lower shell, and the vibration spring is arranged on the upper shell. The vibrating spring is arranged on the bottom face of the lower shell and connected with the base, the vibrating motor is arranged on the bottom face of the lower shell, the mounting ring is arranged in the upper shell, the sieve plate is arranged on the mounting ring, a clamping mechanism is arranged on the mounting ring, and the clamping mechanism comprises a clamping rod, a clamping groove, a clamping sleeve, an elastic piece, an annular groove, an unlocking sleeve and a shifting block. And the clamping rod is arranged on the mounting ring, and the clamping groove is formed in the top end of the clamping rod, so that the technical problems that in the background technology, the grading precision is generally low, the sieve plate is inconvenient to mount and dismount, and the adjustment of the discharge flow speed is limited are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of polishing powder classification, and more specifically, to a polishing powder classification device capable of improving classification accuracy. Background Art

[0002] In the existing technology, the grading accuracy of existing polishing powder grading equipment is generally low. This is mainly because traditional polishing powder grading equipment often lacks attention to fine grading technology during design and manufacturing. These devices may use relatively simple grading mechanisms, such as wind or vibration grading. These methods often cannot achieve ideal grading effects when processing ultra-fine particles or polishing powders that require high-precision grading;

[0003] The existing polishing powder grading equipment has inconveniences in the installation and removal of the sieve plate. The sieve plate is a key component in the grading equipment, which determines whether the material can be effectively separated according to the particle size. However, the sieve plate fixing method in many traditional equipment is complicated and requires tools to tighten and loosen, which not only increases the difficulty of operation, but also prolongs the time for replacement and maintenance. In addition, frequent disassembly and installation may cause damage or deformation of the sieve plate, further affecting the grading effect;

[0004] Existing polishing powder grading equipment has limitations in adjusting the discharge flow rate, which is crucial to ensuring grading efficiency and product quality. However, many devices lack an effective flow rate adjustment mechanism, or the adjustment process is cumbersome and requires manual adjustment of multiple components such as valves and baffles, which not only increases the complexity of operation, but may also lead to inaccurate flow rate adjustment, affecting the grading effect and equipment performance. In addition, improper flow rate adjustment may cause material retention or excessive wear in the equipment, reducing the service life of the equipment. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the problems existing in the prior art, the utility model provides a polishing powder grading device with improved grading accuracy, so as to solve the technical problems mentioned in the background technology, namely, the generally low grading accuracy, the inconvenience in the installation and disassembly of the screen plate, and the limitations in the adjustment of the discharge flow rate.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a polishing powder grading device with improved grading accuracy comprises a base, a grading mechanism is arranged on the base, the grading mechanism comprises a lower shell, an upper shell, a vibration spring, a vibration motor, a mounting ring and a sieve plate, the lower shell is arranged on the base, the upper shell is arranged on the lower shell, the vibration spring is arranged on the bottom surface of the lower shell and connected with the base, the vibration motor is arranged on the bottom surface of the lower shell, the mounting ring is arranged in the upper shell, the sieve plate is arranged on the mounting ring, the mounting ring is provided with a clamping mechanism, the clamping mechanism comprises a clamping rod, a clamping groove, a clamping sleeve, an elastic sheet, an annular groove, an unlocking sleeve and a toggle block, the clamping rod is arranged on the mounting ring, the clamping groove is arranged on the top end of the clamping rod, the clamping sleeve is arranged outside the clamping rod, the elastic sheet is arranged on the inner wall of the clamping sleeve, the annular groove is arranged on the clamping rod, the unlocking sleeve is arranged in the annular groove, and the toggle block is arranged on the outer wall of the unlocking sleeve.

[0009] The utility model is further configured such that the vibration springs are provided in a plurality of groups, and the two ends of the plurality of vibration springs are respectively connected to the bottom surface of the lower shell body and the top surface of the base, and the clamping mechanism is provided in a plurality of groups distributed in a ring shape on the mounting ring, thereby enhancing the stability of the equipment and providing uniform vibration for the grading mechanism.

[0010] The utility model is further configured such that the clamping grooves are provided with a plurality of groups which are sequentially arranged and distributed on the top end of the clamping rod, and the elastic sheets are provided with a plurality of groups which are annularly distributed on the inner wall of the clamping sleeve to form a plurality of fixing points to ensure the stable installation of the screen plate.

[0011] The utility model is further configured such that the unlocking sleeve is slidably installed in the annular groove, a return spring is provided in the annular groove, and two ends of the return spring are respectively connected to the annular groove and the unlocking sleeve, which simplifies the disassembly process of the screen plate and improves the convenience of operation.

[0012] The utility model is further configured such that a sliding groove is provided on the clamping rod, the sliding groove is provided in multiple groups, the toggle blocks are provided in multiple groups and are all slidably installed in the sliding groove, and a yield groove is provided on the clamping sleeve, providing multiple unlocking points, thereby improving the flexibility and reliability of operation.

[0013] The utility model is further configured that the upper shell and the lower shell are both provided with discharge pipes, so that the separated polishing powder can be smoothly discharged from the equipment, avoiding clogging of the material inside the equipment.

[0014] The utility model is further configured such that the bottom ends of the two groups of discharge pipes are provided with a material control mechanism, which includes a valve tube, a rotating rod, a valve plate, a rotating handle, an insert cylinder, a positioning disk and a latch, the valve tube is arranged at the bottom end of the discharge pipe, the rotating rod is rotatably mounted on the valve tube, the valve plate is arranged on the rotating rod, the rotating handle is arranged at one end of the rotating rod, the insert cylinder is arranged on the rotating handle, the positioning disk is arranged on the valve tube, and the latch is arranged on the insert cylinder, thereby realizing precise adjustment of the discharge flow rate.

[0015] The utility model is further configured that the positioning plate is provided with positioning holes, and the positioning holes are provided in multiple groups and are arranged on the positioning plate at a specific angle, so that the adjustment of the material control mechanism is repeatable and can be adjusted to a predetermined flow rate quickly and accurately.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the utility model provides a polishing powder grading device with improved grading accuracy, which has the following beneficial effects:

[0018] 1. Beneficial effects of the grading mechanism: The design of the grading mechanism allows for quick and easy replacement of the sieve plate, improving the flexibility and adaptability of the equipment. The vibration spring driven by the vibration motor causes the upper and lower shells to vibrate, prompting the polishing powder to be effectively separated on the sieve plate. This design not only improves the grading accuracy, but also can handle polishing powder of different particle size ranges, enhancing the grading capacity of the equipment.

[0019] 2. Beneficial effects of the snap-in mechanism: The snap-in mechanism makes the installation and removal of the screen plate quick and easy through its annular distribution design. The cooperation of the snap-in rod and the snap-in sleeve, as well as the functions of the elastic sheet and the unlocking sleeve, ensure that the screen plate can be firmly installed on the mounting ring and can be easily and quickly removed when needed. This design greatly reduces the time for replacing the screen plate, improves the maintenance efficiency of the equipment, and reduces downtime.

[0020] 3. Beneficial effects of the material control mechanism: The material control mechanism achieves precise adjustment of the discharge flow rate through the coordinated action of the valve tube, rotating rod, valve plate, turning handle and other components. The operator can adjust the angle of the valve plate by turning the turning handle, thereby controlling the flow area of ​​the material in the valve tube, thereby affecting the flow rate of the material. This design allows the discharge flow rate to be adjusted according to actual needs, optimizes the grading process, and improves the grading efficiency and product quality. At the same time, the setting of the positioning plate and the latch ensures the stability and repeatability of the material control mechanism, so that the adjusted setting can remain unchanged until the next adjustment is needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a polishing powder grading device for improving grading accuracy in the utility model;

[0022] Figure 2 This is a structural breakdown diagram of the grading mechanism in the utility model;

[0023] Figure 3 It is a schematic diagram of the unlocking structure of the clamping mechanism in the utility model;

[0024] Figure 4 It is a cross-sectional view of the clamping structure of the clamping mechanism in the utility model;

[0025] Figure 5 It is a structural schematic diagram of the material control mechanism in the utility model.

[0026] In the figure: 1. base; 2. lower shell; 3. upper shell; 4. vibration spring; 5. vibration motor; 6. mounting ring; 7. sieve plate; 8. snap-in rod; 9. snap-in groove; 10. snap-in sleeve; 11. elastic sheet; 12. annular groove; 13. unlocking sleeve; 14. toggle block; 15. reset spring; 16. slide groove; 17. give way groove; 18. discharge pipe; 19. valve pipe; 20. rotating rod; 21. valve plate; 22. turning handle; 23. insert cylinder; 24. positioning plate; 25. latch; 26. positioning hole. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0029] In the present invention, unless otherwise specified, directions such as "up" and "down" are usually used in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually used in reference to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0030] See also Figure 1-5A polishing powder grading device for improving grading accuracy comprises a base 1, a grading mechanism is arranged on the base 1, the grading mechanism comprises a lower shell 2, an upper shell 3, a vibration spring 4, a vibration motor 5, a mounting ring 6 and a sieve plate 7, the lower shell 2 is arranged on the base 1, the upper shell 3 is arranged on the lower shell 2, the vibration spring 4 is arranged on the bottom surface of the lower shell 2 and is connected to the base 1, the vibration motor 5 is arranged on the bottom surface of the lower shell 2, the mounting ring 6 is arranged in the upper shell 3, the sieve plate 7 is arranged on the mounting ring 6, and a clamping mechanism is arranged on the mounting ring 6, the clamping mechanism comprises a clamping rod 8, a clamping groove 9, a clamping sleeve 10, an elastic sheet 11, an annular groove 12, an unlocking sleeve 13 and a toggle block 14, the clamping rod 8 is arranged on the mounting ring 6, the clamping groove 9 is arranged on the top of the clamping rod 8, the clamping sleeve 10 is arranged outside the clamping rod 8, the elastic sheet 11 is arranged on the inner wall of the clamping sleeve 10, the annular groove 12 is arranged on the clamping rod 8, the unlocking sleeve 13 is arranged in the annular groove 12, and the toggle block 14 is arranged on the outer wall of the unlocking sleeve 13.

[0031] There are multiple groups of vibration springs 4, and the two ends of the multiple groups of vibration springs 4 are respectively connected to the bottom surface of the lower shell 2 and the top surface of the base 1. The clamping mechanism is provided with multiple groups distributed in a ring shape on the mounting ring 6. The multiple groups of vibration springs 4 are respectively connected to the bottom surface of the lower shell 2 and the top surface of the base 1, forming multiple supporting points, thereby enhancing the stability of the equipment and providing uniform vibration for the grading mechanism.

[0032] Multiple groups of clamping grooves 9 are arranged in sequence at the top of the clamping rod 8, and multiple groups of elastic sheets 11 are distributed in a ring shape on the inner wall of the clamping sleeve 10. Multiple groups of clamping grooves 9 are arranged in sequence at the top of the clamping rod 8, and the elastic sheets 11 are distributed in a ring shape on the inner wall of the clamping sleeve 10, forming multiple fixed points to ensure the stable installation of the screen plate 7.

[0033] The unlocking sleeve 13 is slidably installed in the annular groove 12, and a return spring 15 is provided in the annular groove 12. The two ends of the return spring 15 are respectively connected to the annular groove 12 and the unlocking sleeve 13. The setting of the return spring 15 enables the unlocking sleeve 13 to automatically reset after unlocking, which simplifies the disassembly process of the screen plate 7 and improves the convenience of operation.

[0034] A sliding groove 16 is provided on the clamping rod 8, and there are multiple groups of sliding grooves 16. There are multiple groups of toggle blocks 14, all of which are slidably installed in the sliding grooves 16. A yield groove 17 is provided on the clamping sleeve 10. The setting of multiple groups of sliding grooves 16 and toggle blocks 14 provides multiple unlocking points, thereby improving the flexibility and reliability of operation.

[0035] A discharge pipe 18 is provided on both the upper shell 3 and the lower shell 2. The setting of the discharge pipe 18 enables the separated polishing powder to be smoothly discharged from the equipment, avoiding the blockage of materials inside the equipment and improving the operation efficiency and stability of the equipment.

[0036] A material control mechanism is provided at the bottom end of the two groups of discharge pipes 18, and the material control mechanism includes a valve pipe 19, a rotating rod 20, a valve plate 21, a rotating handle 22, an insert cylinder 23, a positioning disk 24 and a latch 25. The valve pipe 19 is arranged at the bottom end of the discharge pipe 18, the rotating rod 20 is rotatably installed on the valve pipe 19, the valve plate 21 is arranged on the rotating rod 20, the rotating handle 22 is arranged at one end of the rotating rod 20, the insert cylinder 23 is arranged on the rotating handle 22, the positioning disk 24 is arranged on the valve pipe 19, and the latch 25 is arranged on the insert cylinder 23. The valve pipe 19 is connected to the external conveying pipe, and the rotating handle 22 is turned to drive the rotating rod 20 to rotate, and the rotating rod 20 drives the valve plate 21 to rotate. By adjusting the angle of the valve plate 21, the flow area in the valve pipe 19 becomes larger, thereby increasing the flow speed of the material. Conversely, the area becomes smaller and the flow speed of the material is reduced, thereby realizing the precise adjustment of the discharge flow rate, and the appropriate flow rate can be adjusted according to the particle size and screening requirements of the polishing powder, thereby improving the classification efficiency and product quality.

[0037] The positioning plate 24 is provided with positioning holes 26. There are multiple groups of positioning holes 26 and they are arranged at a specific angle on the positioning plate 24. After adjusting to a suitable angle, the insert tube 23 is aligned with the positioning holes 26 on the positioning plate, and the latch 25 is inserted into the insert tube 23 and the positioning holes 26 to fix the handle 22. The setting of the positioning holes 26 makes the adjustment of the material control mechanism repeatable, and the operator can quickly and accurately adjust to the predetermined flow rate, thereby improving the efficiency of the operation and the stability of the equipment.

[0038] In this embodiment, firstly, the sieve plate 7 of a specific coarseness is installed on the mounting ring 6, and the sieve plate 7 is placed on the mounting ring 6 so that the clamping rod 8 passes through the through hole set on the outside of the sieve plate 7, and then the clamping sleeve 10 is sleeved on the clamping rod 8, and the toggle block 14 set on the outer wall of the clamping rod 8 is slid into the makeshift groove 17 set on the clamping sleeve 10. When the top of the clamping rod 8 contacts the elastic sheet 11, the elastic sheet 11 is lifted up, and when the bottom surface of the clamping sleeve 10 contacts the end surface of the sieve plate 7, the elastic sheet 11 moves into the clamping groove 9 to abut against the clamping groove 9, thereby completing the rapid installation of the sieve plate 7. When the sieve plate 7 needs to be disassembled and replaced, the toggle block 14 is pulled upward to drive the unlocking sleeve 13 to slide along the annular groove 12, and at the same time When the reset spring 15 is stretched, the top of the unlocking sleeve 13 is set to an inclined slope, and the top of the unlocking sleeve 13 pushes the elastic sheet 11 out of the clamping groove 9, so that the clamping rod 8 is removed, and then the clamping sleeve 10 is pulled upward to disengage the clamping rod 8, and then the sieve plate 7 can be disassembled. After the appropriate sieve plate 7 is installed, the polishing powder is placed on the sieve plate 7, and the vibration motor 5 is started. The lower shell 2 and the upper shell 3 are driven to vibrate by the vibration motor 5. The polishing powder is repeatedly rolled on the sieve plate 7 by vibration, and the finer polishing powder falls into the lower shell 2 through the sieve plate 7, and the coarser polishing powder remains on the sieve plate 7, and then it can be discharged through the discharge pipes 18 respectively arranged on the upper shell 3 and the lower shell 2.

[0039] See also Figure 5 As an implementation method of a polishing powder grading device for improving the grading accuracy of the material control mechanism: a material control mechanism is provided at the bottom end of the two groups of discharge pipes 18, and the material control mechanism includes a valve tube 19, a rotating rod 20, a valve plate 21, a turning handle 22, an insert cylinder 23, a positioning disk 24 and a latch 25. The valve tube 19 is arranged at the bottom end of the discharge pipe 18, the rotating rod 20 is rotatably installed on the valve tube 19, the valve plate 21 is arranged on the rotating rod 20, the turning handle 22 is arranged at one end of the rotating rod 20, the insert cylinder 23 is arranged on the turning handle 22, the positioning disk 24 is arranged on the valve tube 19, and the latch 25 is arranged on the insert cylinder 23.

[0040] The positioning plate 24 is provided with positioning holes 26 . There are multiple groups of positioning holes 26 disposed on the positioning plate 24 at specific angles.

[0041] More specifically, the valve tube 19 is connected to the external conveying pipe, and the turning handle 22 is turned to drive the turning rod 20 to rotate, and the turning rod 20 drives the valve plate 21 to rotate. By adjusting the angle of the valve plate 21, the flow area in the valve tube 19 becomes larger, thereby increasing the flow speed of the material. Conversely, the area becomes smaller, thereby reducing the flow speed of the material. After adjusting to a suitable angle, align the insert tube 23 with the positioning hole 26 on the positioning plate, insert the pin 25 into the insert tube 23 and the positioning hole 26, and fix the turning handle 22.

[0042] In summary, when the overall device is in use or operation: first, install the sieve plate 7 of a specific coarseness on the mounting ring 6, place the sieve plate 7 on the mounting ring 6, so that the clamping rod 8 passes through the through hole set on the outside of the sieve plate 7, and then put the clamping sleeve 10 on the clamping rod 8, and slide the toggle block 14 set on the outer wall of the clamping rod 8 into the makeshift groove 17 set on the clamping sleeve 10. When the top of the clamping rod 8 contacts the elastic sheet 11, the elastic sheet 11 is lifted up, and when the bottom surface of the clamping sleeve 10 contacts the end surface of the sieve plate 7, the elastic sheet 11 moves into the clamping groove 9 to abut against the clamping groove 9, thereby completing the rapid installation of the sieve plate 7. When the sieve plate 7 needs to be disassembled and replaced, pull the toggle block 14 upwards to drive the unlocking sleeve 13 to move along the annular groove 1 2 slides, and at the same time, the reset spring 15 is stretched. The top of the unlocking sleeve 13 is set as an inclined slope. The top of the unlocking sleeve 13 pushes the elastic sheet 11 out of the clamping groove 9, so that the clamping rod 8 is removed, and then the clamping sleeve 10 is pulled upward to be separated from the clamping rod 8. Then the sieve plate 7 can be disassembled. After the appropriate sieve plate 7 is installed, the polishing powder is placed on the sieve plate 7, and the vibration motor 5 is started. The lower shell 2 and the upper shell 3 are driven to vibrate by the vibration motor 5. The polishing powder is repeatedly rolled on the sieve plate 7 by vibration. The finer polishing powder falls into the lower shell 2 through the sieve plate 7, and the coarser polishing powder remains on the sieve plate 7. Then, it can be discharged through the discharge pipes 18 respectively arranged on the upper shell 3 and the lower shell 2.

[0043] Connect the valve tube 19 to the external conveying pipe, turn the turning handle 22 to drive the turning rod 20 to rotate, and the turning rod 20 drives the valve plate 21 to rotate. By adjusting the angle of the valve plate 21, the flow area in the valve tube 19 becomes larger, thereby increasing the flow speed of the material. Conversely, the area becomes smaller, thereby reducing the flow speed of the material. After adjusting to a suitable angle, align the insert tube 23 with the positioning hole 26 on the positioning plate, insert the pin 25 into the insert tube 23 and the positioning hole 26, and fix the turning handle 22.

[0044] In all the schemes mentioned above, the connection between two parts can be selected according to actual conditions by welding, bolt and nut matching connection, bolt or screw connection or other well-known connection methods, which are not described here one by one. In the above, all fixed connections are preferably welded. Although the embodiments of the utility model have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A polishing powder grading device with improved grading accuracy, comprising a base (1), characterized in that: The base (1) is provided with a grading mechanism, the grading mechanism comprising a lower shell (2), an upper shell (3), a vibration spring (4), a vibration motor (5), a mounting ring (6) and a sieve plate (7); the lower shell (2) is arranged on the base (1); the upper shell (3) is arranged on the lower shell (2); the vibration spring (4) is arranged on the bottom surface of the lower shell (2) and connected to the base (1); the vibration motor (5) is arranged on the bottom surface of the lower shell (2); the mounting ring (6) is arranged in the upper shell (3); the sieve plate (7) is arranged on the mounting ring (6); and a clamping mechanism is arranged on the mounting ring (6). The clamping mechanism comprises a clamping rod (8), a clamping groove (9), a clamping sleeve (10), an elastic sheet (11), an annular groove (12), an unlocking sleeve (13) and a toggle block (14); the clamping rod (8) is arranged on the mounting ring (6); the clamping groove (9) is arranged on the top of the clamping rod (8); the clamping sleeve (10) is arranged outside the clamping rod (8); the elastic sheet (11) is arranged on the inner wall of the clamping sleeve (10); the annular groove (12) is arranged on the clamping rod (8); the unlocking sleeve (13) is arranged in the annular groove (12); and the toggle block (14) is arranged on the outer wall of the unlocking sleeve (13).

2. The polishing powder grading device with improved grading accuracy according to claim 1 is characterized in that: The vibration springs (4) are provided in multiple groups, and the two ends of the multiple groups of vibration springs (4) are respectively connected to the bottom surface of the lower shell (2) and the top surface of the base (1), and the clamping mechanisms are provided in multiple groups distributed in an annular shape on the mounting ring (6).

3. The polishing powder grading device with improved grading accuracy according to claim 2 is characterized in that: The clamping grooves (9) are provided with a plurality of groups which are sequentially arranged and distributed on the top of the clamping rod (8), and the elastic sheets (11) are provided with a plurality of groups which are annularly distributed on the inner wall of the clamping sleeve (10).

4. The polishing powder grading device with improved grading accuracy according to claim 3 is characterized in that: The unlocking sleeve (13) is slidably mounted in the annular groove (12), a return spring (15) is arranged in the annular groove (12), and two ends of the return spring (15) are respectively connected to the annular groove (12) and the unlocking sleeve (13).

5. The polishing powder grading device with improved grading accuracy according to claim 4 is characterized in that: The clamping rod (8) is provided with a slide groove (16), the slide groove (16) is provided with a plurality of groups, the toggle block (14) is provided with a plurality of groups and all are slidably installed in the slide groove (16), and the clamping sleeve (10) is provided with a clearance groove (17).

6. The polishing powder grading device with improved grading accuracy according to claim 5 is characterized in that: The upper shell (3) and the lower shell (2) are both provided with a discharge pipe (18).

7. The polishing powder grading device with improved grading accuracy according to claim 6 is characterized by: The bottom ends of the two groups of discharge pipes (18) are both provided with a material control mechanism, and the material control mechanism comprises a valve tube (19), a rotating rod (20), a valve plate (21), a rotating handle (22), an insert tube (23), a positioning plate (24) and a latch (25). The valve tube (19) is arranged at the bottom end of the discharge pipe (18), the rotating rod (20) is rotatably mounted on the valve tube (19), the valve plate (21) is arranged on the rotating rod (20), the rotating handle (22) is arranged at one end of the rotating rod (20), the insert tube (23) is arranged on the rotating handle (22), the positioning plate (24) is arranged on the valve tube (19), and the latch (25) is arranged on the insert tube (23).

8. The polishing powder grading device with improved grading accuracy according to claim 7 is characterized in that: The positioning plate (24) is provided with positioning holes (26), and the positioning holes (26) are provided in multiple groups and are arranged on the positioning plate (24) at a specific angle.

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