A vertical grinding machine for processing polytetrafluoroethylene for Teflon tubes

Abstract

The present application relates to a vertical mill for processing polytetrafluoroethylene for Teflon tubes, which includes a machine body, a plum blossom frame, a scraper assembly and a material tray, wherein the plum blossom frame is circumferentially connected with a plurality of grinding roller devices, wherein the grinding roller device includes a rotatable first grinding roller and a second grinding roller, wherein the first grinding roller and the second grinding roller are close to each other, wherein a first grinding ring and a second grinding ring are arranged in the machine body, wherein the first grinding ring is arranged in the inner wall of the machine body and is in contact with the side wall of the first grinding roller, and the second grinding ring is arranged on the plum blossom frame and is in contact with the side wall of the second grinding roller. The present application has the effect of increasing the contact surface of the grinding powder and thus improving the grinding efficiency.

Description

Technical Field

[0001] The present application relates to the field of mechanical processing, and in particular to a vertical mill for processing polytetrafluoroethylene for Teflon tubes. Background Art

[0002] Polytetrafluoroethylene, commonly known as the "king of plastics", is a high molecular polymer made by polymerizing tetrafluoroethylene as a monomer. It has excellent heat and cold resistance and can be used for a long time at -180 to 260°C. This material is resistant to acids, alkalis, and various organic solvents, and is almost insoluble in all solvents.

[0003] Teflon tube is a special tube made by extruding and sintering polytetrafluoroethylene material, and then going through processes such as drying, high-temperature sintering, and shaping.

[0004] Grinding polytetrafluoroethylene particles into powder is one of the process steps in the manufacture of Teflon tubes. Due to the large production volume of plastic products, in order to ensure the output of polytetrafluoroethylene powder, it is necessary to improve the production efficiency of the grinding machine. Summary of the invention

[0005] In order to improve the production efficiency of polytetrafluoroethylene powder, the present application provides a vertical mill for processing polytetrafluoroethylene for Teflon tubes.

[0006] A vertical grinding mill for processing polytetrafluoroethylene for Teflon tubes comprises a machine body, a plum blossom frame, a scraper assembly and a material tray, and is characterized in that: a plurality of grinding roller devices are circumferentially connected to the plum blossom frame, the grinding roller device comprises a rotatable first grinding roller and a second grinding roller, the first grinding roller and the second grinding roller are in contact with each other at their respective sides, a first grinding ring and a second grinding ring are arranged in the machine body, the first grinding ring is arranged on the inner wall of the machine body and in contact with the side wall of the first grinding roller, and the second grinding ring is arranged on the plum blossom frame and in contact with the side wall of the second grinding roller.

[0007] Furthermore, a notch is provided circumferentially at the upper end of the plum blossom frame, and the grinding roller device also includes a swing arm, a first roller shaft and a second roller shaft. A lifting ear is provided at the upper end of the swing arm, and the rotating shaft passes through the lifting ear and is connected to the side wall of the notch. The first roller shaft and the second roller shaft are respectively vertically connected to the lower end of the swing arm, the first grinding roller is rotatably connected to the first roller shaft, and the second grinding roller is rotatably connected to the second roller shaft.

[0008] Furthermore, the swing arm is divided into a left arm and a right arm with the lifting ear as a horizontal dividing point, the left arm is close to the plum blossom frame, the right arm is close to the body, and the length of the right arm is greater than that of the left arm.

[0009] Furthermore, the first grinding roller includes a bearing, a hub and a roller sleeve, the inner ring of the bearing is coaxially fixed to the roller shaft, the hub is sleeved and fixed to the outer ring of the bearing, a threaded hole is provided at the end of the hub, the roller sleeve is annularly structured and sleeved outside the hub, a connecting ring is coaxially provided at one end of the roller sleeve, a connecting hole is provided on the connecting ring, and a bolt can pass through the connecting hole and cooperate with the threaded hole to fix the roller sleeve to the hub.

[0010] Furthermore, the scraper assembly is connected to the lower end of the plum blossom frame, and the scraper assembly includes a first scraper, a second scraper, a third scraper and a connecting rod. One end of the connecting rod is connected to the plum blossom frame, and the connecting rod connects the first scraper, the second scraper and the third scraper in series, so that the first scraper is located below the contact surface between the first grinding roller and the first grinding ring, the second scraper is located below the contact surface between the first grinding roller and the second grinding roller, and the third scraper is located below the contact surface between the second grinding roller and the second grinding ring.

[0011] Furthermore, the material tray is provided with a first annular groove, a second annular groove and a third annular groove which are concentric, the lower end of the first scraper is located in the first annular groove, the lower end of the second scraper is located in the second annular groove, and the lower end of the third scraper is located in the third annular groove.

[0012] Furthermore, a first slot is coaxially provided on the inner wall of the body, the first grinding ring is inserted into the first slot, and the bottom wall of the first grinding ring is fixed to the bottom wall of the first slot by bolts.

[0013] Furthermore, the side wall of the plum blossom frame is connected to a second slot via a support rod, the second grinding ring is inserted into the second slot, and the bottom wall of the second grinding ring is fixed to the bottom wall of the second slot via bolts.

[0014] Furthermore, the second grinding ring includes a plurality of second sub-grinding blocks equally divided along the diameter direction of the second grinding ring.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] By providing the first grinding ring, the second grinding ring, the first grinding roller and the second grinding roller, the contact surface of the grinding powder is increased compared with the prior art, thereby improving the grinding efficiency;

[0017] The right arm of the swing arm is longer than the left arm. As the force arm of the right arm is longer, the right arm has a tendency to move downward under the action of the gravity of the first grinding roller. When the plum blossom frame rotates in the grinding state, the first grinding roller of the right arm overcomes its tendency to move downward due to the gravity of the first grinding roller and generates centrifugal force. Therefore, compared with the situation where the left and right arms are equal in length and the plum blossom frame has the same rotation speed, the centrifugal force can be reduced to a certain extent, thereby reducing the pressure on the first grinding ring and avoiding excessive wear of the second grinding ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of this application;

[0019] Figure 2 is an overall cross-sectional view of the present application;

[0020] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0021] Figure 4 It is a schematic diagram of the structure of the plum blossom rack and the material tray of the present application;

[0022] Figure 5 is a cross-sectional view of the first grinding roller and the second grinding roller of the present application;

[0023] Figure 6 It is a structural schematic diagram of the cooperation between the second grinding roller and the second slot.

[0024] Explanation of the accompanying drawings: 1. body; 2. plum blossom frame; 3. scraper assembly; 4. material tray; 5. first grinding roller; 6. second grinding roller; 7. first grinding ring; 8. second grinding ring; 9. notch; 10. swing arm; 11. first roller shaft; 12. second roller shaft; 13. lifting ear; 101. left arm; 102. right arm; 51. bearing; 52. wheel hub; 53. roller sleeve; 54. threaded hole; 55. connecting hole; 31. first scraper; 32. second scraper; 33. third scraper; 34. connecting rod; 41. first ring groove; 42. second ring groove; 43. third ring groove; 14. first slot; 15. second slot; 81. second sub-grinding block. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-6 This application is described in further detail.

[0026] The present application embodiment discloses a vertical mill for processing polytetrafluoroethylene for Teflon tubes. Figure 1 and Figure 2 The vertical grinding mill includes a body 1, a plum blossom frame 2, a scraper assembly 3 and a material tray 4. The plum blossom frame 2 is circumferentially connected with a plurality of grinding roller devices. In this embodiment, the number of the grinding roller devices is 4. In other embodiments, the number of the grinding roller devices can be adjusted according to factors such as the size of the grinding mill.

[0027] Reference Figure 3The inner wall of the machine body 1 is circumferentially provided with a first slot 14, which is in a circular shape, and the upper end surface is concave downward. The first slot 14 and the machine body 1 can be connected by a welding machine, or fixed by bolts. The first grinding ring 7 is plugged into the first slot 14, and the lower end of the first grinding ring 7 is inserted into the first slot 14. The bottom wall of the first grinding ring 7 is fixed to the bottom wall of the first slot 14 by bolts. Specifically, a plurality of equally spaced screw holes can be provided on the bottom wall of the first grinding ring 7, and through holes corresponding to the screw holes are provided on the first slot 14. The bolts pass through the through holes and are connected to the screw holes, so as to fix the first grinding ring 7. When the first grinding ring 7 is worn to a certain extent, the bolts can be removed and the first grinding ring 7 can be replaced. Combined with Figure 6 , the side wall of the shaft body of the plum blossom frame 2 is provided with a second slot 15, and the second grinding ring 8 is plugged into the second ring groove 42. Since the second grinding ring 8 cannot be taken out from the upper end of the plum blossom frame 2 for replacement, the second grinding ring 8 adopts a split design, and the second grinding ring 8 is equally divided into a plurality of second sub-grinding blocks 81 along the diameter direction. The number of second sub-modules corresponds to the number of second grinding rings 8, so the number of second sub-modules in this application is 4, that is, the second grinding ring 8 is equally divided into 4. The bottom wall of the second grinding ring 8 is fixed to the bottom wall of the second slot 15 by bolts, and the bolt fixing method is the same as the connection method between the first grinding ring 7 and the second slot 15 mentioned above, which will not be repeated here. In other words, the bottom wall of the second sub-grinding block 81 is fixed to the bottom wall of the second slot 15 by bolts. When the worn second grinding ring 8 needs to be replaced, the second sub-grinding blocks 81 can be replaced one by one after removing the bolts.

[0028] Reference Figure 3 and 4 , four notches 9 are opened in the circumferential direction at the upper end of the plum blossom frame 2. The grinding roller device includes a first grinding roller 5, a second grinding roller 6, a swing arm 10, a first roller shaft 11 and a second roller shaft 12. A lifting lug 13 is integrally formed on the upper end surface of the swing arm 10, and the rotating shaft is fixed to the side wall of the notch 9 after passing through the lifting lug 13. The connection method between the rotating shaft and the notch 9 can be that the two ends of the rotating shaft pass through the two sides of the notch 9 and then screw the fixing nuts on the two ends of the rotating shaft. The swing arm 10 is divided into a left arm 101 and a right arm 102 with the lifting lug 13 as the horizontal dividing point, wherein the left arm 101 is a section close to the plum blossom frame 2, and the right arm 102 is a section close to the machine body 1, and the length of the right arm 102 is greater than the length of the left arm 101. The first roller shaft 11 is vertically connected to the right arm 102 downward, and the second roller shaft 12 is vertically connected to the left arm 101 downward, and the first roller shaft 11 and the second roller shaft 12 can be fixed to the swing arm 10 by fixing nuts. The first grinding roller 5 is rotatably connected to the first roller shaft 11 , and the second grinding roller 6 is rotatably connected to the second roller shaft 12 .

[0029] Reference Figure 3, the first grinding roller 5 and the second grinding roller 6 are located between the first grinding ring 7 and the second grinding ring 8, and the two ends of the side of the first grinding roller 5 are respectively in contact with the first grinding ring 7 and the second grinding roller 6, and the end of the side of the second grinding roller 6 away from the first grinding roller 5 is in contact with the second grinding ring 8. The diameters of the first grinding roller 5, the second grinding roller 6, the first grinding ring 7 and the second grinding ring 8 are located on the same straight line. Since the force arm of the right arm 102 is longer, under the action of the gravity of the first grinding roller 5, the right arm 102 has a tendency to move downward. When the plum blossom frame 2 rotates in the grinding state, the first grinding roller 5 of the right arm 102 overcomes its tendency to move downward due to the gravity of the first grinding roller 5 and generates centrifugal force. Therefore, compared with the case where the length of the left arm 101 is equal to the length of the right arm 102 and the rotation speed of the plum blossom frame 2 is the same, a certain centrifugal force can be reduced, thereby reducing the pressure on the first grinding ring 7 and avoiding excessive wear of the second grinding ring 8. The first grinding roller 5, the second grinding roller 6, the first grinding ring 7 and the second grinding ring 8 are fitted with each other in a gap. Since the material will be located in the gap between them during grinding, they clamp each other to generate pressure and grind the material into powder by rotating relative to each other.

[0030] Reference Figure 5 The first grinding roller 5 includes a bearing 51, a hub 52 and a roller sleeve 53. The inner ring of the bearing 51 is fixed coaxially with the roller shaft, and the hub 52 is sleeved and fixed to the outer ring of the bearing 51. Specifically, the inner wall of the hub 52 is interference fit with the outer ring of the bearing 51. The lower end of the hub 52 is provided with a threaded hole 54. The roller sleeve 53 is sleeved on the outside of the hub 52 in an annular structure. A coaxial connecting ring is integrally provided at the lower end of the roller sleeve 53. The connecting ring is provided with a through hole aligned with the threaded hole 54. The bolt passes through the through hole of the connecting ring and is connected to the threaded hole 54 of the hub 52, thereby fixing the roller sleeve 53 on the hub 52. The upper end of the hub 52 is conical and has a clearance fit with the first roller shaft 11, so that the hub 52 and the first roller shaft 11 are rotationally matched. An oil seal structure can be added to the conical upper end of the hub 52 to prevent powder from entering the gap between the hub 52 and the first roller shaft 11. The oil seal structure belongs to conventional technical means and is not shown in the figure. The structure of the second grinding roller 6 is the same as that of the first grinding roller 5, and will not be described in detail. The above-mentioned detachable structure of the first grinding roller 5 allows the roller sleeve 53 to be replaced by removing the bolts after the roller sleeve 53 is worn, which facilitates replacement.

[0031] Reference Figure 4The scraper assembly 3 is connected to the lower end of the quincunx frame 2. The scraper assembly 3 includes a first scraper 31, a second scraper 32, a third scraper 33 and a connecting rod 34. One end of the connecting rod 34 is connected to the quincunx frame 2. The connecting rod 34 connects the first scraper 31, the second scraper 32 and the third scraper 33 in series. The first scraper 31 is located below the contact surface between the first grinding roller 5 and the first grinding ring 7, the second scraper 32 is located below the contact surface between the first grinding roller 5 and the second grinding roller 6, and the third scraper 33 is located below the contact surface between the second grinding roller 6 and the second grinding ring 8. Specifically, the upper ends of the first scraper 31, the second scraper 32 and the third scraper 33 are respectively located in front of the rotation direction of the above-mentioned base surfaces to ensure that when the quincunx frame 2 rotates, the material enters each contact surface and is ground into powder. A first annular groove 41, a second annular groove 42 and a third annular groove 43 are provided on the material tray 4 below the scraper assembly 3. The lower end of the first scraper 31 is located in the first annular groove 41, the lower end of the second scraper 32 is located in the second annular groove 42, and the lower end of the third scraper 33 is located in the third annular groove 43. The first annular groove 41, the second annular groove 42 and the third annular groove 43 have a certain gathering effect on the material, thereby increasing the feeding efficiency of the material and improving the grinding efficiency.

[0032] The implementation principle of the vertical grinding mill for processing polytetrafluoroethylene for Teflon tubes in the embodiment of the present application is as follows: when the plum blossom frame 2 rotates, the first grinding roller 5 generates centrifugal force to generate pressure on the first grinding ring 7, and the first grinding roller 5 rotates under the action of friction. Pressure is also generated between the second grinding roller 6 and the first grinding roller 5 under the action of centrifugal force, and the second grinding roller 6 rotates under the drive of the rotation of the first grinding roller 5. Since the material is crushed between the first grinding roller 5 and the first grinding ring 7, and the material is crushed between the second grinding roller 6 and the first grinding roller 5, the original gap between the second grinding roller 6 and the second grinding ring 8 is reduced, and they are squeezed against each other, and they are also squeezed against each other and rotate. Therefore, the materials can be ground between the first grinding roller 5 and the first grinding ring 7, between the second grinding roller 6 and the first grinding roller 5, and between the second grinding roller 6 and the second grinding ring 8, so that the grinding efficiency can be improved compared with the prior art, thereby improving the efficiency of the entire production process.

[0033] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vertical grinding machine for processing polytetrafluoroethylene for Teflon tubes, comprising a machine body (1), a plum blossom frame (2), a scraper assembly (3) and a material tray (4), characterized in that: The plum blossom frame (2) is circumferentially connected with a plurality of grinding roller devices, the grinding roller device comprising a rotatable first grinding roller (5) and a second grinding roller (6), the first grinding roller (5) and the second grinding roller (6) being close to each other on their sides, a first grinding ring (7) and a second grinding ring (8) being arranged in the machine body (1), the first grinding ring (7) being arranged on the inner side wall of the machine body (1) and being close to the side wall of the first grinding roller (5), the second grinding ring (8) being arranged on the plum blossom frame (2) and being close to the side wall of the second grinding roller (6); a notch (9) is circumferentially arranged at the upper end of the plum blossom frame (2), the grinding roller device further comprising a swing arm (10), a first roller shaft (11) and a second roller shaft (12), the swing arm (1 0) is provided with a lifting ear (13), the rotating shaft passes through the lifting ear (13) and is connected to the side wall of the notch (9), the first roller shaft (11) and the second roller shaft (12) are respectively vertically connected to the lower end of the swing arm (10), the first grinding roller (5) is rotatably connected to the first roller shaft (11), and the second grinding roller (6) is rotatably connected to the second roller shaft (12); the swing arm (10) is divided into a left arm (101) and a right arm (102) with the lifting ear (13) as a horizontal dividing point, the left arm (101) is close to the plum blossom frame (2), the right arm (102) is close to the machine body (1), and the length of the right arm (102) is greater than the length of the left arm (101).

2. The vertical mill for processing polytetrafluoroethylene for Teflon tube according to claim 1, characterized in that: The first grinding roller (5) comprises a bearing (51), a wheel hub (52) and a roller sleeve (53); the inner ring of the bearing (51) is coaxially fixed to the roller shaft; the wheel hub (52) is sleeved and fixed to the outer ring of the bearing (51); a threaded hole (54) is provided at the end of the wheel hub (52); the roller sleeve (53) is an annular structure sleeved outside the wheel hub (52); a connecting ring is coaxially provided at one end of the roller sleeve (53); a connecting hole (55) is provided on the connecting ring; a bolt can pass through the connecting hole (55) and cooperate with the threaded hole (54) to fix the roller sleeve (53) on the wheel hub (52).

3. The vertical mill for processing polytetrafluoroethylene for Teflon tube according to claim 1, characterized in that: The scraper assembly (3) is connected to the lower end of the plum blossom frame (2), and the scraper assembly (3) comprises a first scraper (31), a second scraper (32), a third scraper (33) and a connecting rod (34). One end of the connecting rod (34) is connected to the plum blossom frame (2), and the connecting rod (34) connects the first scraper (31), the second scraper (32) and the third scraper (33) in series, so that the first scraper (31) is located below the contact surface between the first grinding roller (5) and the first grinding ring (7), the second scraper (32) is located below the contact surface between the first grinding roller (5) and the second grinding roller (6), and the third scraper (33) is located below the contact surface between the second grinding roller (6) and the second grinding ring (8).

4. The vertical mill for processing polytetrafluoroethylene for Teflon tube according to claim 3, characterized in that: The material tray (4) is provided with a first annular groove (41), a second annular groove (42) and a third annular groove (43) which are concentric with each other; the lower end of the first scraper (31) is located in the first annular groove (41); the lower end of the second scraper (32) is located in the second annular groove (42); and the lower end of the third scraper (33) is located in the third annular groove (43).

5. The vertical mill for processing polytetrafluoroethylene for Teflon tube according to claim 1, characterized in that: A first slot (14) is coaxially provided on the inner wall of the machine body (1), the first grinding ring (7) is inserted into the first slot (14), and the bottom wall of the first grinding ring (7) and the bottom wall of the first slot (14) are fixed by bolts.

6. The vertical mill for processing polytetrafluoroethylene for Teflon tube according to claim 1, characterized in that: The side wall of the plum blossom frame (2) is connected to a second slot (15) via a support rod, the second grinding ring (8) is inserted into the second slot (15), and the bottom wall of the second grinding ring (8) and the bottom wall of the second slot (15) are fixed by bolts.

7. The vertical mill for processing polytetrafluoroethylene for Teflon tube according to claim 1, characterized in that: The second grinding ring (8) comprises a plurality of second sub-grinding blocks (81) equally divided along the diameter direction of the second grinding ring (8).

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