A processing device for high pressure grinding rollers

Abstract

The application discloses a processing device for high-pressure grinding roller, which comprises a drill seat, a lifting shaft and a drill clamp rotatably arranged on the lifting shaft, a hollow drill is arranged on the drill clamp, the hollow drill comprises a sleeve hole matched with the outer diameter of a stud, the hollow drill comprises a first milling cutter for milling a wall body around the stud and a second milling cutter for milling a stepped hole, the second milling cutter is arranged above the first milling cutter and on the outer wall of the first milling cutter, the milling diameter of the second milling cutter is larger than that of the first milling cutter, the hollow drill mills the wall body around the stud through the lifting shaft to expose the stud, and the second milling cutter forms a counterbore around the end of the stud for the swing of the stud, the first milling cutter of the hollow drill mills the wall body around the roller sleeve, the interference fit between the stud and the roller sleeve is removed, the stud is exposed, and the problem that the stud is difficult to take out when the interference friction force is overcome by drawing is avoided.

Description

Technical Field

[0001] This invention relates to the field of roller mill processing equipment technology, and in particular to a processing device for high-pressure grinding rollers. Background Technology

[0002] High-pressure roller mills are widely used grinding equipment in industries such as metal mining, cement, and building materials. Their working principle involves two counter-rotating extrusion rollers generating immense extrusion force under the action of a hydraulic system, thus pulverizing materials. The roller surfaces of high-pressure roller mills typically employ a carbide-coated tooth (stud) roller surface structure, where multiple hard tungsten carbide studs are embedded at specific intervals on the roller sleeve surface. The wear resistance of the studded roller surface mainly utilizes the high hardness and high wear resistance of hard tungsten carbide. Simultaneously, the material being crushed is embedded between the studs, forming a self-lining layer between the studs, preventing the roller surface from directly contacting the newly crushed material, thereby effectively extending the service life of the roller surface.

[0003] However, while hard tungsten carbide cylindrical teeth possess extremely high hardness and wear resistance, their insufficient toughness makes them prone to breakage during production. This is especially true when the material is not thoroughly cleaned of iron; the introduction of iron or other high-hardness foreign objects can easily cause the cylindrical teeth to break under abnormal conditions. Once a cylindrical tooth breaks, the material loses support from the liner, leading to a sharp increase in roller surface wear. If the broken cylindrical tooth is not replaced and continues to be used, it will cause accelerated wear on the roller sleeve, eventually requiring the entire roller sleeve to be scrapped when it wears to a certain extent.

[0004] Regarding the problem of broken spur teeth, the existing technologies mainly include the following repair or replacement solutions: One method involves adding repair teeth around the broken tooth. For example, Chinese patent CN104028945B discloses a method for repairing broken teeth on the roller surface of a high-pressure roller mill. Multiple positioning holes are set around the broken tooth at intervals, and a repair tooth protruding from the roller surface is installed in each positioning hole. The hardness and wear resistance of the repair tooth re-forms a self-lining layer of material. However, this method is cumbersome, and there is a significant strength difference between the repair tooth and the original tooth. The wear resistance of the repaired area is inconsistent with the surrounding area, making it difficult to achieve a balanced overall performance of the roller surface.

[0005] Secondly, mechanical nail-removing devices are used for extraction. Various nail-removing devices exist in the prior art, such as nail-removing devices that weld the lower end of a lead screw to the broken stud and pull the stud out by rotating the nut, and nail-removing devices that use a steel bar to weld the stud and then remove it using impact force. However, these methods all require welding the nail-removing tool to the stud, making the operation complex and requiring ample operating space. More importantly, these methods only solve the problem of the clamping force between the stud and the hole wall, but cannot effectively solve the problem of adhesion between the bottom of the stud and the bottom of the stud hole caused during insertion.

[0006] In fact, the assembly of the pin teeth and the roller surface generally adopts an interference fit to ensure that the pin teeth will not fall off during use. During the press-fitting process of the interference fit, a tight contact and microscopic material adhesion will occur between the bottom of the pin teeth and the bottom of the pin hole under enormous pressure. This bottom adhesion becomes the biggest obstacle to removal after the pin teeth break. Existing pin removal devices and methods focus on overcoming the interference friction between the sidewall of the pin teeth and the hole wall, but lack an effective solution to the adhesion problem between the bottom of the pin teeth and the bottom of the hole. As a result, even when a large axial tensile force is applied, it is still difficult to remove the pin teeth completely from the hole.

[0007] In summary, existing repair and replacement technologies for broken cylindrical teeth in high-pressure roller mills all have varying degrees of defects: adding repaired cylindrical teeth is cumbersome and results in uneven strength in the repaired area; existing pin-removal devices and methods cannot effectively solve the adhesion problem between the bottom of the cylindrical tooth and the bottom of the hole, making it extremely difficult to remove the cylindrical tooth. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a processing apparatus for high-pressure grinding rollers.

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a processing device for high-pressure grinding rollers, comprising a drill base, a lifting shaft and a drill clamp rotatably mounted on the lifting shaft, wherein the drill clamp is provided with a hollow drill, and the hollow drill includes a sleeve hole adapted to the outer diameter of the stud. The hollow drill includes a first milling cutter for milling the wall surrounding the stud and a second milling cutter for milling the stepped hole; The second milling cutter is located above the first milling cutter and is disposed on the outer wall of the first milling cutter; the milling diameter of the second milling cutter is larger than the milling diameter of the first milling cutter. The hollow drill uses a lifting shaft to mill the wall around the stud to expose the stud, and uses a second milling cutter to form a countersunk hole around the end of the stud for the stud to swing.

[0010] In the above scheme, preferably, the lifting shaft is provided with a connecting part that cooperates with the drill chuck, the connecting part including a connecting shell and a positioning groove and a movable groove provided in the connecting shell; The drill chuck is provided with a positioning block that cooperates with the positioning groove and the movable groove; The positioning block is raised and lowered within the connecting shell to cooperate with the positioning groove and the movable groove respectively.

[0011] In the above scheme, preferably, the positioning block is connected to the drill chuck via a connecting shaft, and the connecting shell is provided with a hole for the connecting shaft to move laterally.

[0012] In the above scheme, preferably, a limiting block for restricting the upward sliding of the positioning block is slidably provided in the movable groove, and the limiting block is provided with a driving block after passing through the connecting shell via a limiting rod.

[0013] In the above scheme, preferably, a first spring is provided between the driving block and the connecting shell.

[0014] In the above scheme, preferably, a lifting assembly is slidably provided on the lifting shaft. The lifting assembly includes a lifting plate and a lifting sleeve that cooperate with the connecting shaft. The lifting sleeve is provided with an annular lifting groove, and the lifting plate is provided with a driving component that slidably cooperates with the lifting groove. The drive unit is equipped with a lifting shaft and a limiting plate that cooperate with the lifting plate.

[0015] In the above scheme, preferably, the lifting plate is provided with an elongated slot that mates with the connecting shaft, and the connecting shaft is provided with a snap-fit ​​groove that mates with the elongated slot. The lifting plate and the connecting shaft are slidably connected by a long slot.

[0016] In the above scheme, preferably, the driving member is provided with a pressing block for sliding the driving block, and the pressing block is provided with a pressing surface that transitions with the driving block.

[0017] In the above scheme, preferably, the lifting sleeve is provided with a number of top blocks that cooperate with the driving block after being lifted. When the connecting part rotates, the driving block on it passes through the top blocks in sequence to achieve displacement, thereby causing the positioning block located in the movable groove to slide laterally, realizing slight displacement of the hollow drill.

[0018] In the above scheme, preferably, a second spring is provided between the lifting sleeve and the lifting shaft, and a handle is provided on the outer wall of the lifting sleeve.

[0019] The beneficial effects of the present invention are as follows: First, the present invention uses the first milling cutter of the hollow drill to mill the roller sleeve wall around the stud, thereby releasing the interference fit between the stud and the roller sleeve and exposing the stud, thus avoiding the problem of difficulty in removing it when using the pulling method to overcome the interference friction.

[0020] Secondly, the present invention forms a countersunk hole around the end of the stud by using a second milling cutter. This countersunk hole provides space for the stud to swing. The adhesion between the stud and the bottom of the hole is difficult to overcome by the traditional axial pulling method. However, the present invention solves the problem of the stud bottom adhesion by causing the stud to swing laterally in the countersunk hole, causing the adhered part to undergo fatigue fracture during the swinging process.

[0021] Furthermore, by switching between the positioning groove and the movable groove of the connecting part, and by cooperating with the lifting component and the top block, the present invention realizes the milling and swinging removal of the wall surrounding the stud. The operator only needs to lift and rotate to complete the entire process from milling to swinging removal without changing tools, making the operation simple and efficient.

[0022] Furthermore, the processing device of the present invention does not require welding of the stud during the stud removal process, and can be operated directly on-site after the drill base is fixed, which greatly reduces maintenance costs and time. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0024] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0025] Figure 3 This is a three-dimensional structural diagram of the drill clamp of the present invention. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: See also Figures 1-3 .

[0027] A high-pressure grinding roller processing device includes a drill base 1, a lifting shaft 2, and a drill chuck 3 rotatably mounted on the lifting shaft 2. The drill base 1 is used to fix the entire device on the frame of the high-pressure grinding roller mill or on the ground to ensure stability during processing. In addition, the bottom of the drill base 1 can also be provided with an arc-shaped magnetic suction structure that matches the outer diameter of the grinding roller of the high-pressure grinding roller mill. During processing, the arc-shaped positioning ensures that the center of the drill chuck 3 is aligned with the axis of the grinding roller, so as to achieve coaxial setting with the column teeth to be processed. The lifting shaft 2 can move up and down relative to the drill base 1. The lifting movement can be achieved by conventional driving methods such as hydraulic cylinder, air cylinder or screw nut mechanism, which are not specifically limited in this invention. The drill chuck 3 is rotatably mounted on the lifting shaft 2 and is driven by a motor to rotate, which is used to drive the tool mounted on it to perform rotary cutting. This is a conventional setting of the drilling mechanism and will not be described in detail here.

[0028] The drill chuck 3 is equipped with a hollow drill 301, which includes a socket 302 adapted to the outer diameter of the stud. The inner diameter of the socket 302 is slightly larger than the outer diameter of the stud, and the gap can be maintained at about 0.05-0.1mm, so that the socket 302 can be fitted onto the outside of the broken stud during machining. The hollow drill 301 includes a first milling cutter 303 for milling the wall around the stud and a second milling cutter 304 for milling the stepped hole. The first milling cutter 303 is located at the lower end of the hollow drill 301, and its milling diameter is adapted to the outer diameter of the stud. The second milling cutter 304 is located above the first milling cutter 303 and is located on the outer wall of the first milling cutter 303. The milling diameter of the second milling cutter 304 is larger than the milling diameter of the first milling cutter 303. Figure 1 As shown.

[0029] Specifically, such as Figure 1 As shown, the hollow drill 301 has an overall cylindrical structure, with a socket 302 formed on its inner wall. The first milling cutter 303 is an annular cutting edge located at the lower end of the hollow drill 301. Its inner diameter is the same as the inner diameter of the socket 302, and its outer diameter is slightly larger than or equal to the inner diameter of the socket 302. The milling diameter is approximately equal to the outer diameter of the stud plus the thickness of the two side walls. The second milling cutter 304 is an annular cutting edge located above the first milling cutter 303. Its outer diameter is larger than the outer diameter of the first milling cutter 303. Therefore, the milling diameter of the second milling cutter 304 is larger than the milling diameter of the first milling cutter 303.

[0030] like Figure 2 As shown, the lifting shaft 2 is provided with a connecting part 4 that cooperates with the drill chuck 3. The connecting part 4 is used to realize the switchable connection between the lifting shaft 2 and the drill chuck 3. The connecting part 4 includes a connecting shell 401 and a positioning groove 402 and a movable groove 403 provided in the connecting shell 401. The connecting shell 401 is fixedly set at the lower end of the lifting shaft 2 and moves up and down and rotates synchronously with the lifting shaft 2. The positioning groove 402 and the movable groove 403 are both groove structures provided on the inner wall of the connecting shell 401. The cross-sectional shape of the positioning groove 402 is adapted to the positioning block 31 on the drill chuck 3, and the cross-sectional width of the movable groove 403 is greater than the cross-sectional width of the positioning groove 402.

[0031] The drill chuck 3 is equipped with a positioning block 31 that mates with the positioning groove 402 and the movable groove 403. The positioning block 31 is fixedly mounted on the top of the drill chuck 3, and its outer shape is adapted to the positioning groove 402 and the movable groove 403. The cross-sectional shape of the positioning block 31 can be rectangular, and the lateral width of the movable groove 403 is greater than the lateral width of the positioning groove 402. The positioning block 31 is raised and lowered within the connecting shell 401 to achieve mating with the positioning groove 402 and the movable groove 403 respectively. When the positioning block 31 is located within the positioning groove 402, the positioning block 31 and the positioning groove 402 are circumferentially fixed, and the drill chuck 3 and the lifting shaft 2 are relatively fixed, with the drill chuck 3 rotating synchronously with the lifting shaft 2. When the positioning block 31 slides upward from the positioning groove 402 and enters the movable groove 403, a circumferential gap exists between the positioning block 31 and the movable groove 403, allowing the drill chuck 3 to undergo lateral displacement relative to the lifting shaft 2 within the range of the movable groove 403.

[0032] The positioning block 31 is connected to the drill chuck 3 via the connecting shaft 32. The connecting shell 401 is provided with a hole 33 for the connecting shaft 32 to move laterally. The hole 33 is a through hole that penetrates the side wall of the connecting shell 401. Its diameter is larger than the outer diameter of the connecting shaft 32, providing space for the lateral movement of the connecting shaft 32.

[0033] A limiting block 41 is slidably provided within the movable groove 403 to restrict the upward sliding of the positioning block 31. The limiting block 41 is generally block-shaped, such as... Figure 2 The lateral sliding block 41 is located within the movable groove 403 and can slide along the lateral direction of the movable groove 403. The limiting block 41 passes through the connecting shell 401 via the limiting rod 42 and is subsequently connected to the driving block 43. The limiting rod 42 passes through the side wall of the connecting shell 401. Two limiting rods 42 can be horizontally arranged to improve the sliding stability of the limiting block 41. One end of the limiting rod 42 is fixedly connected to the limiting block 41, and the other end extends outside the connecting shell 401 and is fixedly connected to the driving block 43.

[0034] A first spring 44 is provided between the limiting block 41 and the connecting shell 401. The first spring 44 is sleeved on the outside of the limiting rod 42, with one end abutting against the limiting block 41 and the other end abutting against the inner wall of the connecting shell 401. The first spring 44 is always in an extended state, applying an elastic force to the limiting block 41 towards the center of the connecting shell 401, so that the limiting block 41 is kept in the locked position extending into the movable groove 403. In the locked position, the limiting block 41 is located in the middle of the movable groove 403, and its lower end face abuts against the upper end face of the positioning block 31, preventing the positioning block 31 from sliding upward from the positioning groove 402 into the movable groove 403.

[0035] The lifting shaft 2 is slidably provided with a lifting assembly 5. The lifting assembly 5 is sleeved on the outside of the lifting shaft 2 and can slide up and down along the axial direction of the lifting shaft 2. The lifting assembly 5 includes a lifting plate 51 and a lifting sleeve 52 that cooperate with the connecting shaft 32. The lifting sleeve 52 is an annular sleeve that is sleeved on the outside of the lifting shaft 2 and can be slidably connected to the lifting shaft 2 by a spline. The lifting plate 51 is a plate-shaped structure located below the lifting sleeve 52.

[0036] The lifting plate 51 is connected to the lifting sleeve 52. Specifically, the lifting sleeve 52 is provided with an annular lifting groove 53, and the lifting plate 51 is provided with a driving member 6 that slides in the lifting groove 53. The wall of the driving member 6 away from the center of the connecting shell 401 slides into the lifting groove 53 and can slide along the circumference of the lifting sleeve 52 in the lifting groove 53. The driving member 6 is provided with a lifting shaft 61 and a limiting plate 62 that cooperate with the lifting plate 51. The lifting shaft 61 slides through the hole in the lifting plate 51, and the limiting plate 62 is provided at the lower end of the lifting shaft 61 to prevent the driving member 6 from coming off the lifting plate 51. That is, the lower end of the lifting shaft 61 passes through the lifting plate 51 and then the limiting plate 62 is provided. Initially, when the drill chuck 3 is in the normal drilling state, there is a lifting gap between the limiting plate 62 and the lifting plate 51.

[0037] The lifting plate 51 has an elongated slot 54 that mates with the connecting shaft 32, and the connecting shaft 32 has a locking groove 55 that mates with the elongated slot 54. The lifting plate 51 and the connecting shaft 32 are slidably connected by the elongated slot 54. Specifically, the connecting shaft 32 passes through the elongated slot 54, and the locking groove 55 is an annular groove on the outer wall of the connecting shaft 32. The edge of the elongated slot 54 is engaged in the locking groove 55, realizing the axial connection and circumferential sliding connection between the lifting plate 51 and the connecting shaft 32. When the lifting plate 51 moves upward, the engagement of the elongated slot 54 and the locking groove 55 drives the connecting shaft 32 to move upward. When the connecting shaft 32 undergoes lateral displacement, it can slide laterally within the elongated slot 54.

[0038] The driving component 6 is provided with a pressing block 63 for sliding the driving block 43, and the pressing block 63 is provided with a pressing surface 64 that transitions with the driving block 43. When the lifting sleeve 52 is pulled upward, the driving component 6 moves upward with the lifting sleeve 52, and the pressing surface 64 of the pressing block 63 contacts the driving block 43. The extrusion surface 64 is an inclined or curved surface. As the extrusion block 63 continues to rise, the extrusion surface 64 pushes the drive block 43 to move outward, compressing the first spring 44. The drive block 43 drives the limit block 41 to slide laterally out of the locked position through the limit rod 42, releasing the restriction on the upward sliding of the positioning block 31. Subsequently, the lifting sleeve 52 continues to lift upward. At this time, the limit plate 62 abuts against the lifting plate 51, causing the lifting plate 51 to slide upward. The connecting shaft 32 slides upward, causing the positioning block 31 to slide into the movable groove 403. At this time, the limit block 41 is located on both sides of the positioning block 31. Subsequently, the lifting sleeve 52 continues to slide upward, causing the drive member 6 to continue to slide upward. After the drive block 43 separates from the extrusion block 63, the drive block 43 is just located at the recessed position I1 of the drive member 6, releasing the extrusion on the drive block 43.

[0039] The lifting sleeve 52 is provided with a plurality of top blocks 56 that cooperate with the driving block 43 after being lifted. Preferably, three top blocks 56 are evenly distributed around the circumference of the lifting sleeve 52, and the top blocks 56 are located at positions corresponding to the recessed positions I1. Figure 2 As shown. The top block 56 is a protruding structure set on the inner wall of the lifting sleeve 52, distributed along the circumference of the lifting sleeve 52. When the connecting part 4 rotates, the driving block 43 on it passes through the top block 56 in sequence. The height of the top block 56 is slightly higher than the bottom surface of the driving block 43. When the driving block 43 rotates to the position of the top block 56, the top block 56 pushes the driving block 43, causing the driving block 43 to produce lateral displacement. The lateral displacement of the driving block 43 is transmitted to the limiting block 41 through the limiting rod 42. The lateral sliding of the limiting block 41 pushes the positioning block 31 located in the movable groove 403 to produce lateral sliding. The lateral sliding of the positioning block 31 is transmitted to the drill chuck 3 through the connecting shaft 32, causing the drill chuck 3 and the hollow drill 301 to produce slight lateral displacement, realizing slight displacement of the hollow drill 301.

[0040] A second spring 57 is provided between the lifting sleeve 52 and the lifting shaft 2, and a handle 58 is provided on the outer wall of the lifting sleeve 52. The second spring 57 is sleeved on the outside of the lifting shaft 2, with its upper end abutting against the stepped surface of the lifting shaft 2 and its lower end abutting against the lifting sleeve 52. The second spring 57 is used to automatically reset the lifting sleeve 52 after the lifting operation is completed. The handle 58 is fixedly provided on the outer wall of the lifting sleeve 52 for easy gripping and lifting operation by the operator.

[0041] Method of using a processing device with a high-pressure grinding roller as described above: Fix the drill base 1 to the grinding roller frame or roller surface, align the center of the drill chuck 3 with the axis of the broken stud, lower the lifting shaft 2, and fit the socket 302 of the hollow drill 301 onto the outside of the stud. The inner diameter of the socket 302 is slightly larger than the outer diameter of the stud, with a gap of 0.05 to 0.1 mm. At this time, the positioning block 31 is located in the positioning groove 402 inside the connecting shell 401, and the drill chuck 3 and the lifting shaft 2 are fixed relative to each other.

[0042] The motor is started to drive the drill chuck 3 to rotate, and the lifting shaft 2 drives the hollow drill 301 to feed downwards. The first milling cutter 303 mills the roller sleeve wall around the stud until the interference fit is completely released. Then the second milling cutter 304 mills a countersunk hole around the end of the stud to provide space for subsequent oscillation. After the milling is completed, the lifting shaft 2 stops feeding.

[0043] By holding handle 58 and pulling upwards on lifting sleeve 52, drive component 6 moves upwards accordingly. The pressing surface 64 of pressing block 63 pushes drive block 43 outwards, causing limiting block 41 to slide out of the locked position via limiting rod 42, compressing the first spring 44 and releasing the restriction on upward sliding of positioning block 31. Continuing to pull, limiting plate 62 abuts against lifting plate 51. Lifting plate 51, through the engagement of elongated slot 54 and locking slot 55, drives connecting shaft 32 upwards, and positioning block 31 slides from positioning slot 402 into movable slot 403. At this time, drill chuck 3 can generate lateral displacement within movable slot 403. Drive component 6 continues to rise until drive block 43 enters recessed position I1, releasing the pressure on drive block 43.

[0044] While keeping the lifting sleeve 52 in the lifted state, slowly rotate the lifting shaft 2. The connecting shell 401 rotates with the lifting shaft 2, and the driving block 43 on it passes sequentially over the top block 56 on the inner wall of the lifting sleeve 52. The top block 56 pushes the driving block 43, generating lateral displacement, which is transmitted to the limiting block 41 via the limiting rod 42, pushing the positioning block 31 to slide laterally within the movable groove 403, thereby causing a slight lateral displacement of the drill chuck 3 and the hollow drill 301. This displacement is transmitted to the end of the stud in the socket hole 302, using the countersunk hole milled by the second milling cutter 304 as a clearance space, causing the end of the stud to reciprocate. After multiple oscillations, the adhesion between the bottom of the stud and the bottom of the hole causes fatigue fracture, and the stud completely separates from the bottom of the hole, allowing the broken stud to be removed from the socket hole 302.

[0045] Release handle 58, and lifting sleeve 52 automatically resets under the action of second spring 57. Drive component 6 descends, and pressing block 63 pushes drive block 43 outward again. Positioning block 31 slides back from movable slot 403 to positioning slot 402 under gravity, and drill chuck 3 and lifting shaft 2 are fixedly connected again. After drive block 43 disengages from pressing block 63, it resets under the action of first spring 44, and limit block 41 returns to the locked position. Raise hollow drill 301, remove the device, and the stud removal operation is completed.

[0046] In this embodiment, the wall thickness between the inner wall of the socket 302 and the outer wall of the first milling cutter 302 is preferably greater than 2mm, and the hollow drill 301 is made entirely of cemented carbide steel, giving it greater rigidity, toughness and wear resistance; in addition, when the top block 56 abuts against the drive block 43 to apply displacement, the amount of interference displacement is preferably controlled within 1.5mm, so that the displacement of the hollow drill 301 lateral control pin is within 1.5mm.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A processing device for high-pressure grinding rollers, comprising a drill base (1), a lifting shaft (2), and a drill clamp (3) rotatably mounted on the lifting shaft (2), characterized in that: The drill chuck (3) is provided with a hollow drill (301), which includes a socket (302) that is adapted to the outer diameter of the stud. The hollow drill (301) includes a first milling cutter (303) for milling the wall around the stud and a second milling cutter (304) for milling the stepped hole. The second milling cutter (304) is located above the first milling cutter (303) and is disposed on the outer wall of the first milling cutter (303). The milling diameter of the second milling cutter (304) is larger than that of the first milling cutter (303). The hollow drill (301) mills the wall around the stud through the lifting shaft (2) to expose the stud, and forms a countersunk hole around the end of the stud for the stud to swing through the second milling cutter (304).

2. The processing apparatus for a high-pressure grinding roller according to claim 1, characterized in that: The lifting shaft (2) is provided with a connecting part (4) that cooperates with the drill chuck (3). The connecting part (4) includes a connecting shell (401) and a positioning groove (402) and a movable groove (403) provided in the connecting shell (401). The drill chuck (3) is provided with a positioning block (31) that cooperates with the positioning groove (402) and the movable groove (403); The positioning block (31) is raised and lowered inside the connecting shell (401) to cooperate with the positioning groove (401) and the movable groove (402) respectively.

3. The processing apparatus for a high-pressure grinding roller according to claim 2, characterized in that: The positioning block (31) is connected to the drill chuck (3) via the connecting shaft (32), and the connecting shell (401) is provided with a hole (33) for the connecting shaft (32) to move laterally.

4. The processing apparatus for a high-pressure grinding roller according to claim 2, characterized in that: The movable groove (403) is slidably provided with a limiting block (41) for restricting the upward sliding of the positioning block (31). The limiting block (41) passes through the connecting shell (401) through the limiting rod (42) and is provided with a driving block (43).

5. The processing apparatus for a high-pressure grinding roller according to claim 4, characterized in that: A first spring (44) is provided between the limiting block (41) and the connecting shell (401).

6. The processing apparatus for a high-pressure grinding roller according to claim 4, characterized in that: The lifting shaft (2) is slidably provided with a lifting assembly (5). The lifting assembly (5) includes a lifting plate (51) and a lifting sleeve (52) that cooperate with the connecting shaft (32). The lifting sleeve (52) is provided with an annular lifting groove (53). The lifting plate (51) is provided with a driving component (6) that slidably cooperates with the lifting groove (53). The drive component (6) is provided with a lifting shaft (61) and a limiting plate (62) that cooperate with the lifting plate (51).

7. The processing apparatus for a high-pressure grinding roller according to claim 6, characterized in that: The lifting plate (51) is provided with a long slot (54) that mates with the connecting shaft (32), and the connecting shaft (32) is provided with a snap-fit ​​groove (55) that mates with the long slot (54). The lifting plate (51) and the connecting shaft (32) are slidably connected by a long slot (54).

8. The processing apparatus for a high-pressure grinding roller according to claim 6, characterized in that: The drive member (6) is provided with a pressing block (63) for sliding the drive block (43), and the pressing block (63) is provided with a pressing surface (64) that transitions with the drive block (43).

9. The processing apparatus for a high-pressure grinding roller according to claim 8, characterized in that: The lifting sleeve (52) is provided with a number of top blocks (56) that cooperate with the drive block (43) after being lifted. When the connecting part (4) rotates, the drive block (43) on it passes through the top blocks (56) in sequence and then displaces, thereby causing the positioning block (31) located in the movable groove (403) to slide laterally, thus realizing a slight displacement of the hollow drill (301).

10. The processing apparatus for a high-pressure grinding roller according to claim 9, characterized in that: A second spring (57) is provided between the lifting sleeve (52) and the lifting shaft (2), and a handle (58) is provided on the outer wall of the lifting sleeve (52).

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