Self-driven adjustable dynamic pressure grinding head

Abstract

The utility model discloses a self-driven adjustable dynamic pressure grinding head. A grinding head body comprises a front bearing hole, a middle bearing hole and a rear end shaft hole. The front bearing structure comprises a sliding bearing seat mounted in the front bearing hole, a sliding bearing is matched in the sliding bearing seat, the rear bearing structure comprises a rolling bearing seat mounted in the middle bearing hole, and a double-row rolling bearing is arranged in the rolling bearing seat; the spindle is supported and installed through a sliding bearing and a double-row rolling bearing, the front end of the spindle extends out of the grinding head body and is provided with a grinding wheel through a wheel carrier, a nut sealed on the spindle is screwed at the front end of the sliding bearing, a front blocking cover and a rear blocking cover which limit the double-row rolling bearing in a front-back mode are arranged on a rolling bearing seat, and the front blocking cover and the rear blocking cover are respectively sealed and sleeved on the spindle. A nut for tightly pressing the double-row rolling bearing is screwed on the main shaft in the rear blocking cover; a grinding head body inner cavity between the front bearing structure and the rear bearing structure is a lubricating oil pool, a motor is installed at the rear end of the grinding head body, and a motor output shaft extends into the grinding head body from the shaft hole and is connected with a spindle through a coupler.

Description

Technical Field

[0001] This utility model relates to the structure of grinding machine components, specifically a self-driven adjustable dynamic pressure grinding head. Background Technology

[0002] Grinding is a very important machining method, and grinding machines are one of the most widely used machine tools, applied in various fields of industrial production. The grinding head is a key component of the grinding machine, directly affecting grinding accuracy, surface roughness, waviness, and grinding efficiency.

[0003] The grinding heads configured in surface grinders mainly include hydrostatic grinding heads and rolling bearing grinding heads. Due to their characteristics, these grinding heads and rolling bearing grinding heads are expensive, which restricts the cost of surface grinders and leads to insufficient market competitiveness. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model proposes a self-driven adjustable dynamic pressure grinding head with market competitiveness.

[0005] The self-driven adjustable hydrodynamic grinding head, which can solve the problems of existing technologies, includes a spindle mounted in the grinding head body via front and rear bearing structures. The difference is that:

[0006] 1. The grinding head body includes a coaxial front bearing hole, a middle bearing hole, and a rear shaft hole.

[0007] 2. The front bearing structure includes a sliding bearing seat installed in the front bearing hole, and a sliding bearing is fitted in the tapered hole of the sliding bearing seat. The rear bearing structure includes a rolling bearing seat installed in the middle bearing hole, and a double row of rolling bearings is provided in the rolling bearing seat.

[0008] 3. The main shaft is supported and installed by a sliding bearing and a double-row rolling bearing. The front end of the main shaft extends out of the grinding head body and a grinding wheel is installed through the wheel frame. A nut that seals the main shaft is screwed onto the front end of the sliding bearing located outside the sliding bearing seat. The rolling bearing seat is provided with a front cover and a rear cover for limiting the double-row rolling bearing. The front cover and the rear cover are respectively sealed and fitted onto the main shaft. A nut that tightens the double-row rolling bearing is screwed onto the main shaft inside the rear cover.

[0009] 4. The inner cavity of the grinding head body between the front and rear bearing structures is a lubricating oil pool. A motor is coaxially mounted at the rear end of the grinding head body. The output shaft of the motor extends into the grinding head body from the shaft hole and is connected to the rear end of the main shaft through a coupling.

[0010] Furthermore, the grinding head body is provided with a bolt assembly I for adjusting the radial runout of the spindle. The bolt assembly I includes a screw I that is screwed into the bottom of the bolt I. A radially threaded hole I is provided on the top side of the grinding head body corresponding to the bolt assembly I. A connecting screw hole I is provided on the sliding bearing seat and the sliding bearing corresponding to the threaded hole I. The bolt I is screwed into the threaded hole I, and the screw I is pressed against the spindle through the screw hole I.

[0011] Furthermore, corresponding to the location of the lubricating oil sump, the grinding head body is provided with a bolt assembly II for adjusting the radial runout of the spindle. The bolt assembly II includes a screw II that is screwed into the bottom of the bolt II. Corresponding to the bolt assembly II, a radially threaded hole II is opened inward on the top side of the grinding head body. The bolt II is screwed into the threaded hole II and presses the screw II against the spindle.

[0012] Furthermore, an oil filling hole communicating with a lubricating oil sump is provided on the grinding head body between bolt assembly I and bolt assembly II.

[0013] Conventionally, the sliding bearing is a sleeve with an inner cylindrical hole and an outer conical shape. Axial oil guide grooves are evenly distributed around the outer conical surface of the sleeve. A square toothed external thread is provided at the front end of the sleeve. An axial fan-shaped groove is provided at the lower part of the front end of the sleeve, with the lower end of the fan-shaped groove being smaller and the upper end being larger.

[0014] The beneficial effects of this utility model are:

[0015] This utility model of a self-driven adjustable hydrodynamic grinding head features reliable operation, high stability, strong load-bearing capacity, good vibration resistance, high precision, long service life, convenient maintenance, high cost performance, and easy adjustment. It can replace expensive hydrodynamic and static grinding heads and rolling bearing grinding heads, and can also be widely used in various grinding machines.

[0016] 1. Simple structure: No special equipment is required, and it can be manufactured by ourselves, resulting in low manufacturing costs.

[0017] 2. High cost performance: The price is about 1 / 3 of that of hydrostatic grinding heads or rolling bearing grinding heads.

[0018] 3. High load-bearing capacity: It has a large bearing area and can bear a large load, with strong load-bearing capacity and impact resistance.

[0019] 4. Easy to adjust: It has a special structure to adjust the radial runout and axial movement of the spindle, making it very convenient to restore accuracy.

[0020] 5. High precision: The radial runout and axial movement of the spindle can be reduced to 0.005mm. Attached Figure Description

[0021] Figure 1 This is an isometric view of one embodiment of the present invention.

[0022] Figure 2 for Figure 1 Front view of the implementation method.

[0023] Figure 3 for Figure 2 AA section view in the image.

[0024] Figure 4 for Figure 2 BB section view in the middle.

[0025] Figure 5(a) shows Figure 1 A schematic diagram of the sliding bearing in the implementation method.

[0026] Figure 5(b) is a CC sectional view of Figure 5(a).

[0027] Part Number Identification: 1. Grinding head body; 2. Spindle; 3. Sliding bearing housing; 4. Sliding bearing; 5. Rolling bearing housing; 6. Double row rolling bearing; 7. Motor; 8. Coupling; 9. Wheel frame; 10. Grinding wheel; 11. Nut; 12. Nut; 13. Lubricating oil reservoir; 14. Front cover; 15. Rear cover; 16. Bolt I; 17. Screw I; 18. Oil filling hole; 19. Fan-shaped groove; 20. Oil guide groove; 21. External thread; 22. Countersunk hole I; 23. End cover; 24. Grinding wheel cover; 25. Adjusting washer; 26. Countersunk hole II. Detailed Implementation

[0028] The technical solution of this utility model will be further described below with reference to the embodiments shown in the accompanying drawings.

[0029] This utility model relates to a self-driven adjustable dynamic pressure grinding head, which includes a grinding head body 1 and a main shaft 2 installed inside the grinding head body 1 via front and rear bearing structures.

[0030] The grinding head body 1 is a cuboid hollow structure, containing coaxial front bearing holes and middle bearing holes. The internal space between the front and middle bearing holes is a lubricating oil reservoir 13. A coaxial shaft hole is formed on the rear end face of the grinding head body 1. The space between the middle bearing hole and the rear end face is an oil-free space. A motor 7 is mounted on the rear end face of the grinding head body 1 corresponding to the shaft hole. The output shaft of the motor 7 extends forward through the shaft hole into the oil-free space of the grinding head body 1. Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown.

[0031] The front bearing structure includes a sliding bearing seat 3 and a sliding bearing 4. The sliding bearing seat 3 (with an inner cone and an outer cylindrical hole) is fixedly installed in the front bearing hole of the grinding head body 1. The sliding bearing 4 (a sleeve with an inner cylindrical hole and an outer cone) fits into the sliding bearing seat 3. There is a copper inlay structure between the two mating surfaces. Axial oil guide grooves 20 are evenly distributed around the circumference of the outer cone surface of the sleeve. A square-tooth external thread 21 is opened on the coaxial cylinder at the front end of the sleeve (the diameter is smaller than the diameter of the large end of the outer cone). The cylinder extends forward outside the sliding bearing seat 3. An axial 30° fan-shaped groove 19 (the axial length is about half the length of the sleeve) is opened inward at the lower part of the front end of the cylinder. The lower end of the fan-shaped groove 19 is smaller and the upper end is larger. The rear bearing structure includes a rolling bearing seat 5 and a double-row rolling bearing 6. The rolling bearing seat 5 is fixedly installed in the middle bearing hole. The double-row rolling bearing 6 is installed in the rolling bearing seat 5. Figure 2 As shown in Figures 5(a) and 5(b).

[0032] The main shaft 2 is supported and installed by a sliding bearing 4 and a double-row rolling bearing 6. A front cover 14 (located within the lubricating oil sump 13) is fixed to the front end face of the rolling bearing housing 5 by screws, limiting the front end of the outer ring of the double-row rolling bearing 6. The front cover 14 is fitted onto the main shaft 2, and a skeleton oil seal is provided inside the front cover 14 to seal the main shaft 2. A rear cover 15, limiting the rear end of the outer ring of the double-row rolling bearing 6, is fixed to the rear end face of the rolling bearing housing 5 by screws. An adjusting washer 25 is provided between the rear cover 15 and the double-row rolling bearing 6. A nut 12, screwed onto the main shaft 2, is provided in the cover hole of the rear cover 15. The nut 12 is tightened forward to limit the rear end of the inner ring of the double-row rolling bearing 6. The rear end of the main shaft 2 is coaxially connected to the output shaft of the motor 7 via a coupling 8 in an oil-free space. Figure 2 , Figure 3 As shown.

[0033] The front end of the spindle 2 extends beyond the front end face of the grinding head body 1. From back to front, the front end of the spindle 2 is coaxially equipped with a nut 11, an end cap 23, and a wheel holder 9. The nut 11 is screwed onto the external thread 21 at the front end of the sliding bearing 4. Tightening the nut 11 axially pulls the sliding bearing 4 forward into the sliding bearing seat 3. An oil seal is installed inside the nut 11, sealing the spindle 2. The end cap 23 is installed on the end face of the sliding bearing seat 3, with the nut 11 inside. O-rings are provided on the mating surfaces between the nut 11 and the end cap 23, and between the end cap 23 and the sliding bearing seat 3. A grinding wheel 10 is coaxially mounted on the wheel holder 9. A grinding wheel cover 24 is provided on the front end face of the grinding head body 1 to protect the grinding wheel 10 and the wheel holder 9. Figure 1 , Figure 2 As shown.

[0034] A bolt assembly I is provided corresponding to the position of the front bearing structure, which allows for adjustment of the radial runout of the spindle 2 on the grinding head body 1. The bolt assembly I includes a screw I17 screwed into the bottom of bolt I16. Corresponding to bolt assembly I, a right-coaxial countersunk hole I22 and a threaded hole I are formed inwards at the top side of the grinding head body 1. The axis of the coaxial hole is radial to the spindle 2. Corresponding to the countersunk hole I22 and the threaded hole I, a screw hole I is formed coaxially communicating with the sliding bearing seat 3 and the sliding bearing 4. Bolt I16 is screwed into the threaded hole I22, thereby pressing screw I17 against the spindle 2 through the screw hole I. Figure 1 , Figure 4 As shown.

[0035] A bolt assembly II is provided at the position corresponding to the lubricating oil sump 13, which allows for adjustment of the radial runout of the spindle 2 on the grinding head body 1. The bolt assembly II includes a screw II screwed into the bottom of the bolt II. A coaxial countersunk hole II 26 and a threaded hole II are formed inwardly on the same side top of the grinding head body 1 corresponding to the bolt assembly II. The bolt II is screwed into the threaded hole II within the countersunk hole II 26, pressing the screw II against the spindle 2. An oil filling hole 18 communicating with the lubricating oil sump 13 is provided on the grinding head body 1 between the countersunk hole I 22 and the countersunk hole II 26. Figure 1 As shown.

[0036] The features of this utility model are as follows:

[0037] The main spindle 2's support bearings adopt a two-roller-one-slider configuration, meaning the front end has a tapered sliding bearing and the rear bearings are two rolling bearings. The grinding head body 1 is equipped with two bolt assemblies, one front and one rear, to adjust the radial runout of the main spindle 2. Simultaneously, front and rear nuts 11 and adjusting washers 25 are provided to adjust the axial movement of the main spindle 2, greatly reducing assembly difficulty and facilitating the adjustment (restoration) of the main spindle 2's accuracy. Furthermore, the grinding head body 1 is equipped with a lubricating oil pool 13 for immersion lubrication of the main spindle 2 and the sliding bearing 4, further improving the grinding head's lifespan and accuracy.

Claims

1. A self-driven adjustable hydrodynamic grinding head, comprising a spindle (2) mounted within the grinding head body (1) via front and rear bearing structures, characterized in that: The grinding head body (1) includes a coaxial front bearing hole, a middle bearing hole, and a rear shaft hole; The front bearing structure includes a sliding bearing seat (3) installed in the front bearing hole, and a sliding bearing (4) is fitted in the tapered hole of the sliding bearing seat (3). The rear bearing structure includes a rolling bearing seat (5) installed in the middle bearing hole, and a double row of rolling bearings (6) is provided in the rolling bearing seat (5). The main shaft (2) is supported and installed by a sliding bearing (4) and a double-row rolling bearing (6). The front end of the main shaft (2) extends out of the grinding head body (1) and a grinding wheel (10) is installed through a wheel frame (9). A nut (11) sealed on the main shaft (2) is screwed onto the front end of the sliding bearing (4) located outside the sliding bearing seat (3). The rolling bearing seat (5) is provided with a front cover (14) and a rear cover (15) for the front and rear limiting double-row rolling bearing (6). The front cover (14) and the rear cover (15) are respectively sealed and fitted on the main shaft (2). A nut (12) that tightens the double-row rolling bearing (6) is screwed onto the main shaft (2) inside the rear cover (15). The inner cavity of the grinding head body (1) between the front and rear bearing structures is a lubricating oil pool (13). A motor (7) is coaxially mounted on the rear end of the grinding head body (1). The output shaft of the motor (7) extends into the grinding head body (1) from the shaft hole and is connected to the rear end of the main shaft (2) through a coupling (8).

2. The self-driven adjustable dynamic pressure grinding head according to claim 1, characterized in that: Corresponding to the position of the front bearing structure, the grinding head body (1) is provided with a bolt assembly I for adjusting the radial runout of the spindle (2). The bolt assembly I includes a screw I (17) that is screwed into the bottom of the bolt I (16). A radial threaded hole I is provided inward on the side top of the grinding head body (1) corresponding to the bolt assembly I. A connecting screw hole I is provided on the sliding bearing seat (3) and the sliding bearing (4) corresponding to the threaded hole I. The bolt I (16) is screwed into the threaded hole I and the screw I (17) is pressed against the spindle (2) through the screw hole I.

3. The self-driven adjustable dynamic pressure grinding head according to claim 2, characterized in that: Corresponding to the position of the lubricating oil pool (13), the grinding head body (1) is provided with a bolt assembly II for adjusting the radial runout of the spindle (2). The bolt assembly II includes a screw II that is screwed into the bottom of the bolt II. Corresponding to the bolt assembly II, a radially threaded hole II is opened inward on the top side of the grinding head body (1). The bolt II is screwed into the threaded hole II and presses the screw II against the spindle (2).

4. The self-driven adjustable dynamic pressure grinding head according to claim 3, characterized in that: The grinding head body (1) between bolt assembly I and bolt assembly II is provided with an oil filling hole (18) that communicates with the lubricating oil pool (13).

5. The self-driven adjustable dynamic pressure grinding head according to any one of claims 1 to 4, characterized in that: The sliding bearing (4) is a sleeve with an inner cylindrical hole and an outer cone. Axial oil guide grooves (20) are evenly distributed on the outer cone surface of the sleeve. A square tooth external thread (21) is provided at the front end of the sleeve. An axial fan-shaped groove (19) is provided at the lower part of the front end of the sleeve. The lower end of the fan-shaped groove (19) is small and the upper end is large.

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