A detection sampling device for coating production

Abstract

The present invention relates to the field of detection sampling, and in particular to a detection sampling device for paint production, comprising a stirring tank and a shaft seat fixedly installed in the middle of the upper end of the stirring tank, a limit card seat is engaged at the upper edge of the stirring tank, a bearing guide column is fixedly installed in the middle of the side of the limit card seat, a guide piece is connected to the lower end of the bearing guide column, a sliding sleeve is fitted on the outer surface of the bearing guide column, an upper connecting ear is extended from the side of the sliding sleeve, a push frame is rotatably installed at the end of the upper connecting ear, the end of the push frame is elastically connected to the end of the guide piece, a No. 2 sampling tube is connected to the end of the guide piece, and the limit frames are fixedly installed at the upper edges of the front and rear ends of the limit card seat. The present invention improves the convenience and efficiency of sampling, and at the same time avoids affecting the production of paint during sampling.

Description

Technical Field

[0001] The invention relates to the field of detection sampling, and in particular to a detection sampling device for coating production. Background Art

[0002] Paint, traditionally known as varnish. The so-called paint is applied to the surface of the object to be protected or decorated, and can form a continuous film that is firmly attached to the coated object. During the production and mixing process of the paint, it is often necessary to sample the paint in the mixing tank and test the sampled paint to determine whether it is qualified. To ensure accuracy, it is generally necessary to sample multiple positions in the mixing tank, namely the middle and edge positions. However, in the actual sampling process, the middle part is blocked by the stirring blade, which requires the machine to be stopped for sampling. The sampling process affects the production of the paint, and only one position can be sampled at a time, resulting in low sampling efficiency. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a detection sampling device for coating production.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a detection sampling device for paint production, comprising a stirring tank and an axle seat fixedly installed in the middle of the upper end of the stirring tank, a limiting clamping seat is engaged at the upper edge of the stirring tank, a load-bearing guide column is fixedly installed in the middle of the side surface of the limiting clamping seat, a guide piece is connected to the lower end of the load-bearing guide column, a sliding sleeve is fitted on the outer surface of the load-bearing guide column, an upper connecting ear extends from the side surface of the sliding sleeve, a pushing frame is rotatably installed at the end of the upper connecting ear, the end of the pushing frame is elastically connected to the end of the guide piece, a No. 2 sampling tube is connected to the end of the guide piece, limiting frames are fixedly installed at the upper edges of the front and rear ends of the limiting clamping seat, the end of the limiting frame is fitted with the axle seat, and a No. 1 sampling tube is connected to the lower end of the load-bearing guide column.

[0005] Preferably, the guide member includes a fixed sleeve fixedly installed on the lower end of the bearing guide column, a guide shell No. 1 is coaxially embedded in the interior of the fixed sleeve, a limit ring No. 1 is fitted inside the interior of the guide shell No. 1, a guide shell No. 2 is coaxially embedded in the interior of the limit ring No. 1, the guide shell No. 2 passes through the end of the guide shell No. 1, the guide shell No. 2 is slidably matched with the guide shell No. 1, and the sampling tube No. 1 is fixed to the front end of the fixed sleeve.

[0006] Preferably, a No. 2 limiting ring is fittedly installed inside the No. 2 guide shell, and a guide rod is coaxially embedded inside the No. 2 limiting ring. The guide rod passes through the end of the No. 2 guide shell, and the guide rod and the No. 2 guide shell are slidably matched. A top wheel is installed on the end of the guide rod, and a stirring shaft is rotatably installed through the middle of the upper end of the shaft seat. The stirring shaft extends into the interior of the stirring tank, and the top wheel corresponds to the stirring shaft. A plurality of stirring blades are evenly distributed and fixedly installed on the outer surface of the stirring shaft.

[0007] Preferably, a No. 1 piston is fittedly installed inside the No. 1 sampling tube, the No. 1 piston passes through the lower end of the No. 1 sampling tube, a sampling paddle is fixedly installed on the lower end of the No. 1 piston, a sampling rack is fixedly installed on the front end of the sliding sleeve, the sampling rack corresponds to the sampling paddle, a No. 2 piston is fittedly installed inside the No. 2 sampling tube, the No. 2 piston passes through the upper end of the No. 2 sampling tube, a wheel frame is fixedly installed on the upper end of the No. 2 piston, a sampling wheel is installed on the end of the wheel frame, and the outer surface of the No. 2 piston and the outer surface of the No. 1 piston are both extended with limiting plates.

[0008] Preferably, a shell frame extends from the upper edge of the guide rod, a column shell is fixedly installed on the upper end of the shell frame, a lower connecting ear is rotatably installed on the end of the push frame, a push column is fixedly installed on the side of the lower connecting ear, the push column passes through the end of the column shell, and the push column is slidably fitted with the column shell.

[0009] Preferably, a limiting convex ring is coaxially embedded in the end of the push column, and the limiting convex ring fits into the interior of the column shell. The upper and lower end surfaces of the interior of the column shell are extended with ridges, and the ridges fit through the outer surface of the limiting convex ring. A spring body is fixedly installed on the side of the limiting convex ring, and the end of the spring body is fixed to the inner side of the column shell.

[0010] Preferably, a rail frame is fixedly installed on the outer surface of the push column near the lower connecting ear, a sampling guide rail is fixedly installed on the end of the rail frame, the end of the sampling guide rail is inclined downward, the sampling wheel is attached to the end of the sampling guide rail, and a tube rack is fixedly installed on the outer surface of the No. 2 sampling tube, and the end of the tube rack is fixed to the shell frame.

[0011] Preferably, a pressing frame is fixedly installed on the rear end of the sliding sleeve, the shape of the limiting socket is concave, the inner lower edge of the limiting socket is inclined, a holding ring is fixedly installed on the upper end of the pressing frame, and flip covers are installed on both sides of the shaft seat.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. By pushing the sliding sleeve downward, the push frame can be driven to move, so as to push the guide rod, so that the guide rod extends out of the No. 2 guide shell, and the No. 2 guide shell extends out of the No. 1 guide shell, so that the No. 2 sampling tube located on the inner wall of the mixing tank can move horizontally to pass between the upper and lower stirring blades, and move to the stirring shaft for sampling. The process does not require stopping for sampling, thereby effectively avoiding affecting the production of paint during sampling.

[0014] When the second sampling tube moves to the stirring shaft, the top wheel at the end of the guide rod just fits on the stirring shaft, and the lower end of the sampling frame fits on the sampling paddle, and then the sliding sleeve is continued to be pressed downward. At this time, the sampling frame will push the sampling paddle, so that the No. 1 piston can slide downward in the No. 1 sampling tube to draw the paint at the edge of the stirring tank into the No. 1 sampling tube for sampling. At the same time, the No. 2 sampling tube will remain stationary due to the top wheel fitting on the stirring shaft, and the pushing frame will continue to move driven by the sliding sleeve that continues to move downward to push the pushing column. At this time, the spring body contracts and deforms, so that the pushing column of the No. 2 sampling tube can move normally in a stationary state, and the moving pushing column drives the sampling guide to move, so that the sampling wheel can roll on the inclined section of the sampling guide to drive the No. 2 piston to move upward, so as to draw the paint in the middle of the stirring tank into the No. 2 sampling tube for sampling, thereby achieving the purpose of sampling two different positions at the same time, effectively improving the sampling convenience and sampling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a detection sampling device for coating production according to the present invention;

[0016] Figure 2 This is a schematic diagram of a limit card seat of a detection sampling device for coating production of the present invention;

[0017] Figure 3 The present invention is a detection sampling device for coating production Figure 2 A magnified view of middle;

[0018] Figure 4 This is a schematic diagram of the first guide shell of a detection and sampling device for coating production of the present invention;

[0019] Figure 5 This is a schematic diagram of the second sampling tube of a detection sampling device for coating production of the present invention;

[0020] Figure 6 This is an internal view of a column housing of a detection and sampling device for coating production of the present invention;

[0021] Figure 7 The present invention is an internal view of a guide shell No. 1 of a detection and sampling device for coating production.

[0022] In the figure: 1, stirring tank; 2, shaft seat; 3, flip cover; 4, stirring shaft; 5, stirring blade; 6, limit card seat; 7, limit frame; 8, No. 1 sampling tube; 9, top wheel; 10, bearing guide column; 11, pressing frame; 12, No. 1 limit ring; 13, pushing frame; 14, column shell; 15, No. 1 guide shell; 16, fixing sleeve; 17, upper connecting ear; 18, sliding sleeve; 19, sampling frame; 20, guide rod; 2 1. No. 2 guide shell; 22. Push column; 23. Lower connecting ear; 24. Rail frame; 25. Sampling guide rail; 26. Sampling wheel; 27. No. 2 sampling tube; 28. Tube rack; 29. ​​Shell frame; 30. No. 1 piston; 31. Sampling paddle; 32. Limit plate; 33. No. 2 piston; 34. Wheel frame; 35. Limiting convex ring; 36. Convex ridge; 37. Spring body; 38. No. 2 limiting ring; 39. Holding ring. DETAILED DESCRIPTION

[0023] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0024] like Figure 1-Figure 7 The present invention shows a detection sampling device for coating production, comprising a stirring tank 1 and a shaft seat 2 fixedly mounted at the middle of the upper end of the stirring tank 1, wherein the shaft seat 2 serves to support the stirring shaft 4, a limit clamping seat 6 is engaged at the upper edge of the stirring tank 1, and the limit clamping seat 6 serves to limit the downward movement height of the second sampling tube 27 and the first sampling tube 8, a bearing guide column 10 is fixedly mounted at the middle of the side surface of the limit clamping seat 6, a guide piece is connected to the lower end of the bearing guide column 10, a sliding sleeve 18 is fitted on the outer surface of the bearing guide column 10, an upper connecting ear 17 is extended from the side surface of the sliding sleeve 18, and the bearing guide column 10 serves to guide the sliding sleeve 18. The end of the upper connecting ear 17 is rotatably installed with a pushing frame 13, and the upper connecting ear 17 plays the role of connecting the pushing frame 13. The end of the pushing frame 13 is elastically connected to the end of the guide member, and the end of the guide member is connected to the No. 2 sampling tube 27. The pushing frame 13 plays the role of pushing the No. 2 sampling tube 27. The limiting frames 7 are fixedly installed at the upper edges of the front and rear ends of the limiting card seat 6. The limiting frame 7 can limit the top wheel 9 so that the top wheel 9 can correspond to the stirring shaft 4. The end of the limiting frame 7 is in contact with the shaft seat 2. The lower end of the bearing guide column 10 is connected to the No. 1 sampling tube 8, and the No. 2 sampling tube 27 and the No. 1 sampling tube 8 both play the role of sampling.

[0025] The guide member includes a fixing sleeve 16 fixedly installed on the lower end of the bearing guide column 10, and a No. 1 guide shell 15 is coaxially embedded inside the fixing sleeve 16. The fixing sleeve 16 plays a role in fixing the No. 1 guide shell 15. A No. 1 limiting ring 12 is fitted inside the No. 1 guide shell 15. The No. 1 limiting ring 12 plays a role in preventing the No. 2 guide shell 21 from separating from the No. 1 guide shell 15. A No. 2 guide shell 21 is coaxially embedded inside the No. 1 limiting ring 12. The No. 2 guide shell 21 passes through the end of the No. 1 guide shell 15. The No. 2 guide shell 21 and the No. 1 guide shell 15 play a role in guiding the No. 2 sampling tube 27. The No. 2 guide shell 21 is slidably matched with the No. 1 guide shell 15, and the No. 1 sampling tube 8 is fixed to the front end of the fixing sleeve 16.

[0026] The second guide housing 21 is fitted with a second limiting ring 38, and the second limiting ring 38 is coaxially inlaid with a guide rod 20. The second limiting ring 38 prevents the second guide housing 21 and the guide rod 20 from separating. The guide rod 20 passes through the end of the second guide housing 21, and the guide rod 20 and the second guide housing 21 are slidably matched. The end of the guide rod 20 is installed with a top wheel 9, and the sliding sleeve 18 is pressed downward to drive the push frame 13 to move through the downward sliding sleeve 18, so as to push the guide rod 20, so that the guide rod 20 extends out of the second guide housing 21, and the second guide housing 21 is in the first guide housing. 15 extends out, so that the No. 2 sampling tube 27 located at the inner wall of the stirring tank 1 can be horizontally moved sideways to pass between the upper and lower stirring blades 5 and move to the stirring shaft 4. The No. 2 guide shell 21 and the guide rod 20 play a role in guiding the No. 2 sampling tube 27. The stirring shaft 4 is rotatably installed through the middle of the upper end of the shaft seat 2. The stirring shaft 4 extends into the interior of the stirring tank 1. The top wheel 9 corresponds to the stirring shaft 4. A plurality of stirring blades 5 are evenly distributed and fixedly installed on the outer surface of the stirring shaft 4. The stirring shaft 4 is driven by an external motor to drive the stirring blades 5 to rotate to stir the paint.

[0027] The interior of the No. 1 sampling tube 8 is fitted with a No. 1 piston 30, which penetrates from the lower end of the No. 1 sampling tube 8. The No. 1 piston 30 can slide in the No. 1 sampling tube 8 to extract the paint. The lower end of the No. 1 piston 30 is fixedly installed with a sampling paddle 31, and the front end of the sliding sleeve 18 is fixedly installed with a sampling frame 19. The sampling frame 19 can push the sampling paddle 31 to move the No. 1 piston 30 downward to draw the paint into the No. 1 sampling tube 8. The sampling frame 19 corresponds to the sampling paddle 31. The interior of the No. 2 sampling tube 27 is fitted with a No. 1 piston 30, which penetrates from the lower end of the No. 1 sampling tube 8. The No. 1 piston 30 can slide in the No. 1 sampling tube 8 to extract the paint. The lower end of the No. 1 piston 30 is fixedly installed with a sampling paddle 31, and the front end of the sliding sleeve 18 is fixedly installed with a sampling frame 19. The sampling frame 19 can push the sampling paddle 31 to move the No. 1 piston 30 downward to draw the paint into the No. 1 sampling tube 8. The sampling frame 19 corresponds to the sampling paddle 31. A No. 2 piston 33 is installed in the combination, and the No. 2 piston 33 passes through the upper end of the No. 2 sampling tube 27. The No. 2 piston 33 can slide in the No. 2 sampling tube 27 to extract the paint. A wheel frame 34 is fixedly installed on the upper end of the No. 2 piston 33, and a sampling wheel 26 is installed on the end of the wheel frame 34. The wheel frame 34 serves to support the sampling wheel 26. The outer surface of the No. 2 piston 33 and the outer surface of the No. 1 piston 30 are extended with a limit plate 32. The limit plate 32 prevents the No. 2 piston 33 and the No. 1 piston 30 from rotating.

[0028] A frame 29 extends from the upper edge of the guide rod 20, and a column shell 14 is fixedly installed on the upper end of the frame 29, and the frame 29 serves to fix the column shell 14. A lower connecting ear 23 is rotatably installed on the end of the push frame 13, and a push column 22 is fixedly installed on the side of the lower connecting ear 23, and the lower connecting ear 23 serves a connecting function. The push column 22 passes through the end of the column shell 14, and the push column 22 serves to push the sampling guide rail 25, and the push column 22 and the column shell 14 are slidably matched.

[0029] The end of the push column 22 is coaxially inlaid with a limiting convex ring 35, which fits inside the column shell 14. The limiting convex ring 35 can prevent the push column 22 from separating from the column shell 14. The upper and lower end surfaces of the interior of the column shell 14 are extended with ridges 36, which fit through the outer surface of the limiting convex ring 35. The ridges 36 prevent the push column 22 from rotating. A spring body 37 is fixedly installed on the side of the limiting convex ring 35. The end of the spring body 37 is fixed to the inner side of the column shell 14. The push frame 13 is driven by the sliding sleeve 18 that continues to move downward to push the push column 22. At this time, the spring body 37 contracts and deforms, allowing the No. 2 sampling tube 27 to push the column 22 to move normally when it is stationary.

[0030] A rail frame 24 is fixedly installed on the outer surface of the push column 22 near the lower connecting ear 23, and a sampling guide rail 25 is fixedly installed on the end of the rail frame 24. The rail frame 24 plays a role in fixing the sampling guide rail 25. The end of the sampling guide rail 25 is tilted downward, and the sampling wheel 26 is attached to the end of the sampling guide rail 25. The moving push column 22 drives the sampling guide rail 25 to move, so that the sampling wheel 26 can roll on the inclined section of the sampling guide rail 25 to drive the No. 2 piston 33 to move upward, so as to draw the paint in the middle of the mixing tank 1 into the No. 2 sampling tube 27 for sampling. A pipe rack 28 is fixedly installed on the outer surface of the No. 2 sampling tube 27, and the end of the pipe rack 28 is fixed to the shell frame 29. The pipe rack 28 plays a role in fixing the No. 2 sampling tube 27.

[0031] A pressing frame 11 is fixedly installed at the rear end of the sliding sleeve 18, and the pressing frame 11 plays a role of pushing and pulling the sliding sleeve 18. The shape of the limiting clamping seat 6 is concave, and the inner lower edge of the limiting clamping seat 6 is inclined, which can be easily engaged with the edge of the mixing tank 1. A holding ring 39 is fixedly installed on the upper end of the pressing frame 11, and the holding ring 39 plays a role of facilitating the holding of the pressing frame 11. Flip covers 3 are installed on both sides of the shaft seat 2, and the flip covers 3 play a role of sealing the mixing tank 1.

[0032] When sampling, flip the cover 3 upward to open it, then put the bearing guide column 10 into the mixing tank 1 along the inner wall of the mixing tank 1, so that the limit clamping seat 6 can be engaged with the edge of the mixing tank 1, and the end of the limit frame 7 is attached to the shaft seat 2. At this time, the top wheel 9 just corresponds to the mixing shaft 4, and the second sampling tube 27 is located between the upper and lower mixing blades 5. Then, hold the pressing frame 11 to press the sliding sleeve 18 downward, so that the sliding sleeve 18 moves the pushing frame 13 to move. The second sampling tube 27 located at the inner wall of the mixing tank 1 can be horizontally moved to the side to pass through the upper and lower stirring blades 5 and move to the stirring shaft 4. When the second sampling tube 27 moves to the stirring shaft 4, the top wheel 9 at the end of the guide rod 20 just fits on the stirring shaft 4, and the lower end of the sampling frame 19 fits on the stirring shaft 4. The sampling paddle 31 is then pressed and the sleeve 18 is continuously pressed downward. At this time, the sampling frame 19 will push the sampling paddle 31, so that the No. 1 piston 30 can slide downward in the No. 1 sampling tube 8 to draw the paint at the edge of the mixing tank 1 into the No. 1 sampling tube 8 for sampling. At the same time, the No. 2 sampling tube 27 will remain stationary due to the top wheel 9 being attached to the mixing shaft 4, and the pushing frame 13 will continue to move driven by the sliding sleeve 18 that continues to move downward to push the pushing column 22. At this time, the spring body 37 contracts and deforms, so that the No. 2 sampling tube 27 can push the column 22 to move normally in a stationary state, and the sampling guide rail 25 can be driven to move by the moving pushing column 22, so that the sampling wheel 26 can roll on the inclined section of the sampling guide rail 25 to drive the No. 2 piston 33 to move upward, so as to draw the paint in the middle of the mixing tank 1 into the No. 2 sampling tube 27 for sampling, thereby completing the paint sampling operation at two different positions in the mixing tank 1.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A detection sampling device for coating production, comprising a stirring tank (1) and a shaft seat (2) fixedly mounted at the middle of the upper end of the stirring tank (1), characterized in that: A limit holder (6) is engaged at the upper edge of the mixing tank (1), a bearing guide column (10) is fixedly installed in the middle of the side of the limit holder (6), a guide piece is connected to the lower end of the bearing guide column (10), a sliding sleeve (18) is fitted on the outer surface of the bearing guide column (10), an upper connecting ear (17) is extended from the side of the sliding sleeve (18), a pushing frame (13) is rotatably installed at the end of the upper connecting ear (17), the end of the pushing frame (13) is elastically connected to the end of the guide piece, and a No. 2 sampling tube (27) is connected to the end of the guide piece. A limit holder (7) is fixedly installed at the upper edges of the front and rear ends of the limit holder (6), the end of the limit holder (7) is fitted with the shaft seat (2), and the lower end of the bearing guide column (10) is connected to the No. 1 sampling tube (8); The guide member comprises a fixing sleeve (16) fixedly mounted on the lower end of the bearing guide column (10), a guide shell (15) is coaxially embedded inside the fixing sleeve (16), a limit ring (12) is fitted inside the guide shell (15), a guide shell (21) is coaxially embedded inside the limit ring (12), the guide shell (21) passes through the end of the guide shell (15), the guide shell (21) is slidably matched with the guide shell (15), and the sampling tube (8) is fixed to the front end of the fixing sleeve (16); A No. 2 limiting ring (38) is fitted inside the No. 2 guide housing (21), a guide rod (20) is coaxially inlaid inside the No. 2 limiting ring (38), the guide rod (20) passes through the end of the No. 2 guide housing (21), the guide rod (20) and the No. 2 guide housing (21) are slidably matched, a top wheel (9) is installed at the end of the guide rod (20), a stirring shaft (4) is rotatably installed through the middle of the upper end of the shaft seat (2), and the top wheel (9) corresponds to the stirring shaft (4); A No. 1 piston (30) is fitted inside the No. 1 sampling tube (8), and the No. 1 piston (30) penetrates from the lower end of the No. 1 sampling tube (8). A sampling paddle (31) is fixedly mounted on the lower end of the No. 1 piston (30). A sampling frame (19) is fixedly mounted on the front end of the sliding sleeve (18), and the sampling frame (19) corresponds to the sampling paddle (31). A No. 2 piston (33) is fitted inside the No. 2 sampling tube (27), and the No. 2 piston (33) penetrates from the upper end of the No. 2 sampling tube (27). A wheel frame (34) is fixedly mounted on the upper end of the No. 2 piston (33), and a sampling wheel (26) is mounted on the end of the wheel frame (34); A shell frame (29) extends from the upper edge of the guide rod (20), a column shell (14) is fixedly mounted on the upper end of the shell frame (29), a lower connecting ear (23) is rotatably mounted on the end of the push frame (13), a push column (22) is fixedly mounted on the side of the lower connecting ear (23), the push column (22) penetrates the end of the column shell (14), and the push column (22) and the column shell (14) are slidably matched; The end of the push column (22) is coaxially inlaid with a limiting convex ring (35), the limiting convex ring (35) is fitted into the interior of the column housing (14), a spring body (37) is fixedly mounted on the side of the limiting convex ring (35), and the end of the spring body (37) is fixed to the inner side of the column housing (14); A rail frame (24) is fixedly mounted on the outer surface of the push column (22) near the lower connecting ear (23); a sampling guide rail (25) is fixedly mounted on the end of the rail frame (24); the end of the sampling guide rail (25) is tilted downward; the sampling wheel (26) is attached to the end of the sampling guide rail (25); a tube rack (28) is fixedly mounted on the outer surface of the No. 2 sampling tube (27); the end of the tube rack (28) is fixed to the shell frame (29).

2. A coating production detection sampling device according to claim 1, characterized in that: The stirring shaft (4) extends into the interior of the stirring tank (1), and a plurality of stirring blades (5) are evenly distributed and fixedly mounted on the outer surface of the stirring shaft (4).

3. A coating production detection sampling device according to claim 2, characterized in that: The outer surface of the second piston (33) and the outer surface of the first piston (30) are both extended with a limit plate (32).

4. A coating production detection sampling device according to claim 3, characterized in that: The upper and lower end surfaces of the column shell (14) are both provided with convex ridges (36), and the convex ridges (36) are fitted and penetrate the outer surface of the limiting convex ring (35).

5. A coating production detection sampling device according to claim 1, characterized in that: A pressing frame (11) is fixedly mounted on the rear end of the sliding sleeve (18); the limiting clamping seat (6) is in a concave shape; the inner lower edge of the limiting clamping seat (6) is arranged in an inclined surface; a holding ring (39) is fixedly mounted on the upper end of the pressing frame (11); and flip covers (3) are mounted on both sides of the shaft seat (2).

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