Large-drift-diameter headstock of cylindrical grinding machine

Abstract

The utility model provides a large-drift-diameter headstock of a cylindrical grinding machine, and belongs to the technical field of machine tool machining equipment. The device comprises a body shell and a main shaft channel horizontally arranged in the body shell, a main shaft is arranged in the main shaft channel in a penetrating mode, the front end of the main shaft is connected with a large-drift-diameter chuck, the main shaft is rotationally connected with the main shaft channel through a rotary connecting assembly, and a lengthened positioning groove coaxially arranged with a chuck positioning groove in the large-drift-diameter chuck is horizontally formed in the main shaft in a penetrating mode. The rear end of the main shaft is sleeved with a driven wheel, the driven wheel is connected with a driving assembly, and the driven wheel is connected with the rear end of the main shaft through a radial positioning structure. The driven wheel and the main shaft are positioned at high precision, the position of the driven wheel on the main shaft is accurate and stable, and the main shaft is high in transmission precision and small in transmission error; a rear-mounted direct transmission main shaft is adopted to rotate, the structure is compact, the transmission links are few, and the transmission error is small; and the workpiece is fixed more stably and reliably.

Description

Technical Field

[0001] The utility model belongs to the technical field of machine tool processing equipment and relates to a large-diameter headstock of an external cylindrical grinder. Background Art

[0002] Cylindrical grinding machines are used to grind the outer surfaces of cylindrical, conical or other shaped workpieces and the end faces of shaft shoulders. They are mainly used for precision grinding of the end faces, outer circles and conical surfaces of batches of shaft parts. They are the main equipment in the automotive engine industry and other industries.

[0003] The headstock on the cylindrical grinder is used to fix the spindle, and the spindle is connected to a chuck for fixing the workpiece to be processed. However, the existing spindle has low transmission accuracy and large transmission error when driven by a driving device, and since the axial length of the chuck positioning groove on the chuck is limited, when the length of the workpiece to be processed is long, the chuck is easily unstable. Utility Model Content

[0004] The utility model aims to solve the above problems and provides a large-diameter headstock for a cylindrical grinder.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A large-diameter headstock for an external cylindrical grinder comprises a body shell and a spindle channel horizontally arranged in the body shell, a spindle is passed through the spindle channel, a large-diameter chuck is connected to the front end of the spindle, the spindle and the spindle channel are rotationally connected via a rotating connection assembly, an extended positioning groove coaxially arranged with a chuck positioning groove on the large-diameter chuck is horizontally passed through the spindle, a driven wheel is sleeved on the rear end of the spindle, the driven wheel is connected to a driving assembly, and the driven wheel and the rear end of the spindle are connected via a radial positioning structure.

[0007] The extended positioning groove plays a role in giving way and placing longer workpieces, making the fixation of the workpiece more stable and reliable. When the longer workpiece is fixed, the drive assembly runs through the driven wheel sleeved on the rear end of the spindle to realize the rear-mounted drive spindle rotation. The structure is compact, with fewer transmission links and smaller transmission errors. The rotation of the spindle synchronously drives the longer workpiece to rotate for grinding operations. The radial positioning structure can play a role in high-precision radial positioning between the driven wheel and the spindle, ensuring that the driven wheel will not have position deviation during the rotation process, achieving constant torque output, thereby improving the accuracy and stability of the entire transmission system, and ensuring that the connection between the driven wheel and the spindle is firm and reliable. The rotating connection assembly supports the weight of the spindle and bears the load from the spindle, ensuring the stable operation of the spindle, and can effectively reduce the friction when the spindle rotates.

[0008] In the above-mentioned large-diameter headstock of the external cylindrical grinder, the radial positioning structure includes a tapered section arranged on the rear end of the main shaft, the outer surface of the tapered section is an inclined surface gradually inclined downward from the inner end to the outer end, the inner ring of the driven wheel is provided with a tapered surface that fits tightly with the outer surface of the tapered section, and the outer end of the driven wheel is also provided with a fixing piece.

[0009] The conical surface on the inner ring of the driven wheel fits tightly with the outer surface of the conical segment. The gap between the conical surface and the conical segment is very small, and even a gap-free fit can be achieved, realizing high-precision positioning and ensuring that the driven wheel will not have position deviation during rotation. Due to the characteristics of the conical surface, the position between the conical surface and the conical segment will be automatically adjusted to achieve the best fit. This fit has automatic centering and self-locking functions, which can ensure that the position of the driven wheel on the main shaft is accurate and stable, and that the driven wheel is firmly and reliably connected. The fixings on the outer end of the driven wheel play a fixing role.

[0010] In the above-mentioned large-diameter headstock of the external cylindrical grinder, the fixing part includes a fixing sleeve mounted on the tapered section, the inner end of the fixing sleeve is tightly abutted against the outer end of the driven wheel, and the fixing sleeve is connected to the main shaft by a key or a locking nut.

[0011] The fixing sleeve can be fixedly connected to the main shaft, and the inner end of the fixing sleeve and the outer end of the driven wheel are tightly abutted to realize the positioning and fixing of the driven wheel, so that the connection of the driven wheel is more firm and reliable.

[0012] In the above-mentioned large-diameter headstock of the external cylindrical grinder, a first connecting plane is provided on the outer end of the conical section, and a second connecting plane which cooperates and connects with the first connecting plane is provided on the inner ring of the fixed sleeve.

[0013] The first connecting plane on the outer end of the tapered section is matched and connected with the second connecting plane on the inner ring of the fixing sleeve, so as to facilitate the positioning and installation of the fixing sleeve.

[0014] In the above-mentioned large-diameter headstock of the external cylindrical grinder, the rotating connection assembly includes a positioning boss arranged on the middle section of the main shaft, and a first outer step and a second outer step are formed between the two sides of the positioning boss and the main shaft respectively. The inner surface of the main shaft channel is provided with a first inner step and a second inner step corresponding to the first outer step and the second outer step. The main shaft is sleeved with a plurality of bearings respectively located on both sides of the positioning boss, and the bearings abut against each other. The inner and outer rings of the bearings abut against the outer surface of the main shaft and the inner surface of the main shaft channel respectively. The outer ends of the inner and outer rings of the bearing closest to the first outer step abut against the first outer step and the first inner step respectively, and the outer end of the bearing farthest from the first outer step on the same side is provided with a first sealing positioning member, and the outer ends of the inner and outer rings of the bearing closest to the second outer step abut against the second outer step and the second inner step respectively, and the outer end of the bearing farthest from the second outer step on the same side is provided with a second sealing positioning member.

[0015] The bearings support the main shaft, ensuring the stable operation of the main shaft and reducing the friction force on the main shaft when it rotates. Several bearings close to the first outer step side abut against each other and are positioned and fixed by the first outer step, the first inner step and the first sealing locator. Several bearings close to the second outer step side abut against each other and are positioned and fixed by the second outer step, the second inner step and the second sealing locator. The bearings are firmly and reliably fixed without loosening or displacement.

[0016] In the above-mentioned large-diameter headstock of the external cylindrical grinder, the first sealing positioning member includes a first flange sleeved on the front end of the spindle, a positioning inner step is provided on the front end of the spindle, the outer end of the first flange abuts on the positioning inner step, the first flange is fixedly connected to the outer end of the spindle channel, the inner end of the first flange abuts against the bearing, and the inner end of the first flange is also provided with a first positioning step adapted to the outer end of the spindle channel.

[0017] The first flange on the front end of the main shaft plays a role in positioning and fixing the bearing. The inner end of the first flange abuts against the outer end of the main shaft channel through the first positioning step, and the outer end abuts against the inner positioning step. The first flange is accurately positioned and easy to assemble. The first flange is fixedly connected to the outer end of the main shaft channel, and the connection of the first flange is firm and reliable.

[0018] In the above-mentioned large-diameter headstock of the external cylindrical grinder, the first flange is a labyrinth flange.

[0019] The labyrinth flange has the advantages of high sealing performance, zero leakage, long life and a variety of material options. It can maintain a stable sealing effect, reduce the frequency of maintenance and replacement, and reduce operating costs.

[0020] In the above-mentioned large-diameter headstock of the external cylindrical grinder, the second sealing positioning member includes a second flange sleeved on the rear end of the spindle, the second flange is fixedly connected to the outer end of the spindle channel, the inner end of the second flange and the bearing abut against each other, a second positioning step adapted to the outer end of the spindle channel is provided on the inner end of the second flange, a positioning groove is provided on the outer end of the second flange, a positioning sleeve sleeved on the spindle is provided in the positioning groove, and the positioning sleeve is fixedly connected to the spindle.

[0021] The second flange on the rear end of the main shaft plays a role in positioning and fixing the bearing. The inner end of the second flange abuts against the outer end of the main shaft channel through the second positioning step, and the outer end is positioned and fixed by a positioning sleeve arranged in the positioning groove. The second flange is accurately positioned and easy to assemble. The second flange is fixedly connected to the outer end of the main shaft channel, and the connection of the second flange is firm and reliable.

[0022] In the above-mentioned large-diameter headstock of the external cylindrical grinder, the number of bearings near the first outer step side is four, and the number of bearings near the second outer step side is two.

[0023] The front end of the spindle is the precision control end, and the rear end is the free end. The transmission accuracy requirements at the front end of the spindle are higher than those at the rear end of the spindle. Four bearings and two bearings are set at the front end and rear end of the spindle respectively to meet the accuracy requirements at both ends of the spindle.

[0024] In the above-mentioned large-diameter headstock of the external cylindrical grinder, the driving assembly includes a servo motor arranged above the body shell, the output end of the servo motor is coaxially connected to a reducer, the output end of the reducer is coaxially connected to a driving wheel, the driving wheel and the driven wheel are connected by a synchronous belt transmission, and the reducer is fixed to the body shell through a fixed seat.

[0025] The servo motor drives the driving wheel to rotate through the reducer, and the rotation of the driving wheel drives the driven wheel to rotate synchronously through the synchronous belt, thereby driving the main shaft to rotate, which can achieve zero gap, zero transmission error, zero return error, and high transmission accuracy.

[0026] Compared with the existing technology, the advantages of the utility model are: 1. The driven wheel and the main shaft are positioned with high precision, ensuring that the position of the driven wheel on the main shaft is accurate and stable, the transmission accuracy of the main shaft is high, and the transmission error is small. 3. The rear-mounted direct drive main shaft rotation is adopted, which has a compact structure, fewer transmission links, and small transmission errors. 3. The fixation of the workpiece is more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a side view provided by the utility model;

[0028] Figure 2 It is a cross-sectional view provided by the utility model.

[0029] In the figure, body shell 1, spindle channel 2, spindle 3, large diameter chuck 4, rotary connection component 5, chuck positioning groove 6, lengthened positioning groove 7, driven wheel 8, driving component 9, radial positioning structure 10, tapered section 11, tapered surface 12, fixing member 13, fixing sleeve 14, first connecting plane 15, second connecting plane 16, positioning boss 17, first outer step 18, second outer step 19, first inner step 20, second inner step 21, bearing 22, first sealing positioning member 23, second sealing positioning member 24, first flange 25, positioning inner step 26, first positioning step 27, second flange 28, second positioning step 29, positioning groove 30, positioning sleeve 31, servo motor 32, reducer 33, driving wheel 34, synchronous belt 35, and fixing seat 36. DETAILED DESCRIPTION

[0030] like Figure 1 and Figure 2As shown, a large-diameter headstock of an external cylindrical grinder comprises a body shell 1 and a spindle channel 2 horizontally arranged in the body shell 1, a spindle 3 is passed through the spindle channel 2, a large-diameter chuck 4 is connected to the front end of the spindle 3, the spindle 3 and the spindle channel 2 are rotationally connected via a rotating connection component 5, an extended positioning groove 7 coaxially arranged with a chuck positioning groove 6 on the large-diameter chuck 4 is horizontally passed through the spindle 3, a driven wheel 8 is sleeved on the rear end of the spindle 3, the driven wheel 8 is connected to a driving component 9, and the driven wheel 8 and the rear end of the spindle 3 are connected via a radial positioning structure 10.

[0031] In the utility model, the longer workpiece to be processed is passed through the chuck positioning groove 6 and the elongated positioning groove 7 on the spindle 3, and the end to be processed of the longer workpiece is fixed by the large-diameter chuck 4. The elongated positioning groove 7 plays a role of giving way to the longer workpiece, making the fixation of the workpiece more stable and reliable. When the longer workpiece is fixed, the driving component 9 runs through the driven wheel 8 sleeved on the rear end of the spindle 3 to realize the rear-mounted drive spindle 3 to rotate. The structure is compact, the transmission links are few, and the transmission error is small. The rotation of the spindle 3 synchronously drives the longer workpiece to rotate for grinding operation. The radial positioning structure 10 can play the role of high-precision radial positioning between the driven wheel 8 and the spindle 3, ensuring that the driven wheel 8 will not have position deviation during the rotation process, realizing constant torque output, thereby improving the accuracy and stability of the entire transmission system, and ensuring that the connection between the driven wheel 8 and the spindle 3 is firm and reliable. The rotating connection component 5 supports the weight of the spindle 3 and bears the load from the spindle 3, ensuring the stable operation of the spindle 3, and can effectively reduce the friction force on the spindle 3 when it rotates.

[0032] Specifically, combined with Figure 2 As shown, the radial positioning structure 10 includes a conical section 11 arranged on the rear end of the main shaft 3, the outer surface of the conical section 11 is an inclined surface gradually inclined downward from the inner end to the outer end, the inner ring of the driven wheel 8 is provided with a conical surface 12 that fits tightly with the outer surface of the conical section 11, and the outer end of the driven wheel 8 is also provided with a fixing part 13.

[0033] The conical surface 12 on the inner ring of the driven wheel 8 fits tightly with the outer surface of the conical section 11. The gap between the conical surface 12 and the conical section 11 is very small, and even a gap-free fit can be achieved, thereby realizing high-precision positioning and ensuring that the driven wheel 8 will not have position deviation during rotation. Due to the characteristics of the conical surface 12, the position between the conical surface 12 and the conical section 11 will be automatically adjusted to achieve the best fit. This fit has automatic centering and self-locking functions, which can ensure that the position of the driven wheel 8 on the main shaft 3 is accurate and stable, and that the driven wheel 8 is firmly and reliably connected. The fixing piece 13 on the outer end of the driven wheel 8 plays a fixing role.

[0034] Specifically, combined with Figure 2 As shown, the fixing member 13 includes a fixing sleeve 14 sleeved on the conical section 11, the inner end of the fixing sleeve 14 is tightly abutted against the outer end of the driven wheel 8, and the fixing sleeve 14 is connected to the main shaft 3 through a key connection or a locking nut.

[0035] The fixing sleeve 14 can be fixedly connected to the main shaft 3, and the inner end of the fixing sleeve 14 is tightly abutted against the outer end of the driven wheel 8 to realize the positioning and fixing of the driven wheel 8, so that the connection of the driven wheel 8 is more firm and reliable.

[0036] Preferably, combined Figure 2 As shown, a first connecting plane 15 is provided on the outer end of the conical section 11 , and a second connecting plane 16 which is matched and connected with the first connecting plane 15 is provided on the inner ring of the fixing sleeve 14 .

[0037] The first connecting plane 15 on the outer end of the tapered section 11 is matched with the second connecting plane 16 on the inner ring of the fixing sleeve 14 to facilitate the positioning and installation of the fixing sleeve 14 .

[0038] Specifically, combined with Figure 2 As shown, the rotary connection assembly 5 includes a positioning boss 17 arranged on the middle section of the main shaft 3, and a first outer step 18 and a second outer step 19 are formed between the two sides of the positioning boss 17 and the main shaft 3 respectively. A first inner step 20 and a second inner step 21 corresponding to the first outer step 18 and the second outer step 19 are provided on the inner surface of the main shaft channel 2. A plurality of bearings 22 are sleeved on the main shaft 3 and are respectively located on both sides of the positioning boss 17. The bearings 22 abut against each other. The inner and outer rings of the bearings 22 abut against the outer surface of the main shaft 3 and the inner surface of the main shaft channel 2 respectively. The outer ends of the inner and outer rings of the bearing 22 closest to the first outer step 18 abut against the first outer step 18 and the first inner step 20 respectively. The outer end of the bearing 22 farthest from the first outer step 18 on the same side is provided with a first sealing locator 23. The outer ends of the inner and outer rings of the bearing 22 closest to the second outer step 19 abut against the second outer step 19 and the second inner step 21 respectively. The outer end of the bearing 22 farthest from the second outer step 19 on the same side is provided with a second sealing locator 24.

[0039] A number of bearings 22 sleeved on the main shaft 3 and located on both sides of the positioning boss 17 support the main shaft 3, ensure the stable operation of the main shaft 3 and reduce the friction force on the main shaft 3 when it rotates. A number of bearings 22 near the first outer step 18 side abut against each other and are positioned and fixed by the first outer step 18, the first inner step 20 and the first sealing positioning member 23. A number of bearings 22 near the second outer step 19 side abut against each other and are positioned and fixed by the second outer step 19, the second inner step 21 and the second sealing positioning member 24. The bearings 22 are firmly and reliably fixed without loosening or displacement.

[0040] Specifically, combined with Figure 2 As shown, the first sealing positioning member 23 includes a first flange 25 sleeved on the front end of the main shaft 3, and a positioning inner step 26 is provided on the front end of the main shaft 3. The outer end of the first flange 25 abuts against the positioning inner step 26. The first flange 25 is fixedly connected to the outer end of the main shaft channel 2, and the inner end of the first flange 25 abuts against the bearing 22. The inner end of the first flange 25 is also provided with a first positioning step 27 adapted to the outer end of the main shaft channel 2.

[0041] The first flange 25 on the front end of the main shaft 3 plays a role in positioning and fixing the bearing 22. The inner end of the first flange 25 abuts against the outer end of the main shaft channel 2 through the first positioning step 27, and the outer end abuts against the positioning inner step 26. The first flange 25 is accurately positioned and easy to assemble. The first flange 25 is fixedly connected to the outer end of the main shaft channel 2, and the connection of the first flange 25 is firm and reliable.

[0042] Preferably, combined Figure 2 As shown, the first flange 25 is a labyrinth flange.

[0043] The labyrinth flange has the advantages of high sealing performance, zero leakage, long life and a variety of material options. It can maintain a stable sealing effect, reduce the frequency of maintenance and replacement, and reduce operating costs.

[0044] Specifically, combined with Figure 2 As shown, the second sealing positioning member 24 includes a second flange 28 sleeved on the rear end of the main shaft 3, the second flange 28 is fixedly connected to the outer end of the main shaft channel 2, the inner end of the second flange 28 and the bearing 22 abut against each other, and a second positioning step 29 adapted to the outer end of the main shaft channel 2 is provided on the inner end of the second flange 28, a positioning groove 30 is provided on the outer end of the second flange 28, a positioning sleeve 31 sleeved on the main shaft 3 is provided in the positioning groove 30, and the positioning sleeve 31 is fixedly connected to the main shaft 3.

[0045] The second flange 28 on the rear end of the main shaft 3 plays a role in positioning and fixing the bearing 22. The inner end of the second flange 28 abuts against the outer end of the main shaft channel 2 through the second positioning step 29, and the outer end is positioned and fixed by a positioning sleeve 31 arranged in the positioning groove 30. The second flange 28 is accurately positioned and easy to assemble. The second flange 28 is fixedly connected to the outer end of the main shaft channel 2, and the connection of the second flange 28 is firm and reliable.

[0046] Specifically, combined with Figure 2 As shown, the number of bearings 22 near the first outer step 18 is four, and the number of bearings 22 near the second outer step 19 is two.

[0047] In this embodiment, the bearing 22 is an angular contact bearing, which has high precision and rigidity and can withstand high axial and radial loads.

[0048] The front end of the spindle 3 is a precision control end, and the rear end is a free end. The transmission accuracy requirement of the front end of the spindle 3 is higher than that of the rear end of the spindle 3. Four bearings 22 and two bearings 22 are respectively arranged at the front end and the rear end of the spindle 3 to meet the accuracy requirements of both ends of the spindle 3.

[0049] Specifically, combined with Figure 1 and Figure 2 As shown, the driving assembly 9 includes a servo motor 32 arranged above the body shell 1, the output end of the servo motor 32 is coaxially connected to a reducer 33, the output end of the reducer 33 is coaxially connected to a driving wheel 34, the driving wheel 34 and the driven wheel 8 are connected through a synchronous belt 35, and the reducer 33 is fixed on the body shell 1 through a fixing seat 36.

[0050] The servo motor 32 drives the driving wheel 34 to rotate through the reducer 33. The driving wheel 34 rotates to synchronously drive the driven wheel 8 to rotate through the synchronous belt 35, so as to drive the main shaft 3 to rotate, and can achieve no gap, no transmission error, no return error, and high transmission accuracy.

[0051] The working principle of the utility model is as follows: the longer workpiece to be processed is sequentially inserted into the chuck positioning groove 6 and the extended positioning groove 7 on the spindle 3, and the end to be processed of the longer workpiece is fixed by the large-diameter chuck 4. When the longer workpiece is fixed, the servo motor 32 drives the driving wheel 34 to rotate through the reducer 33, and the driving wheel 34 rotates and drives the driven wheel 8 to rotate synchronously through the synchronous belt 35 to drive the spindle 3 to rotate. The spindle 3 rotates and drives the longer workpiece to rotate synchronously through the large-diameter chuck 4 to perform the grinding operation;

[0052] The conical surface 12 on the inner ring of the driven wheel 8 is closely fitted with the outer surface of the conical section 11. The gap between the conical surface 12 and the conical section 11 is very small, and even a gapless fit can be achieved, thereby realizing high-precision positioning and ensuring that the driven wheel 8 will not have position deviation during the rotation process. Due to the characteristics of the conical surface 12, the position between the conical surface 12 and the conical section 11 will be automatically adjusted to achieve the best matching state. This matching mode has the functions of automatic centering and self-locking, which can ensure that the position of the driven wheel 8 on the main shaft 3 is accurate and stable, and ensure that the driven wheel 8 is firmly and reliably connected;

[0053] The bearing 22 sleeved on the main shaft 3 supports the main shaft 3 , thereby ensuring the stable operation of the main shaft 3 and reducing the friction force on the main shaft 3 when it rotates.

[0054] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0055] Although this article uses more terms such as body shell 1, spindle channel 2, spindle 3, large diameter chuck 4, rotary connection component 5, chuck positioning groove 6, extended positioning groove 7, driven wheel 8, drive component 9, radial positioning structure 10, tapered section 11, tapered surface 12, fixing member 13, fixing sleeve 14, first connecting plane 15, second connecting plane 16, positioning boss 17, first outer step 18, second outer step 19, first inner step 20, second inner step 21, bearing 22, first sealing locator 23, second sealing locator 24, first flange 25, positioning inner step 26, first positioning step 27, second flange 28, second positioning step 29, positioning groove 30, positioning sleeve 31, servo motor 32, reducer 33, driving wheel 34, synchronous belt 35, fixing seat 36, etc., these terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A large-diameter headstock for an external cylindrical grinding machine, comprising a body shell (1) and a spindle channel (2) horizontally arranged in the body shell (1), a spindle (3) passing through the spindle channel (2), a large-diameter chuck (4) connected to the front end of the spindle (3), characterized in that: The spindle (3) and the spindle channel (2) are rotationally connected via a rotation connection assembly (5); an extended positioning groove (7) is horizontally penetrated in the spindle (3) and is coaxially arranged with a chuck positioning groove (6) on the large diameter chuck (4); a driven wheel (8) is sleeved on the rear end of the spindle (3); the driven wheel (8) is connected to a driving assembly (9); and the driven wheel (8) and the rear end of the spindle (3) are connected via a radial positioning structure (10).

2. The large diameter headstock of the cylindrical grinding machine according to claim 1, characterized in that: The radial positioning structure (10) comprises a conical section (11) arranged on the rear end of the main shaft (3), the outer surface of the conical section (11) is an inclined surface that gradually slopes downward from the inner end to the outer end, the inner ring of the driven wheel (8) is provided with a conical surface (12) that is tightly fitted with the outer surface of the conical section (11), and the outer end of the driven wheel (8) is also provided with a fixing member (13).

3. The large diameter headstock of the cylindrical grinding machine according to claim 2, characterized in that: The fixing member (13) comprises a fixing sleeve (14) sleeved on the conical section (11), the inner end of the fixing sleeve (14) tightly abuts against the outer end of the driven wheel (8), and the fixing sleeve (14) is connected to the main shaft (3) via a key connection or a locking nut.

4. The large diameter headstock of the cylindrical grinding machine according to claim 3, characterized in that: A first connecting plane (15) is provided on the outer end of the conical section (11), and a second connecting plane (16) which is matched and connected with the first connecting plane (15) is provided on the inner ring of the fixing sleeve (14).

5. The large diameter headstock of the cylindrical grinding machine according to claim 1, characterized in that: The rotary connection assembly (5) comprises a positioning boss (17) arranged on the middle section of the main shaft (3), a first outer step (18) and a second outer step (19) are formed between the two sides of the positioning boss (17) and the main shaft (3), respectively, a first inner step (20) and a second inner step (21) corresponding to the first outer step (18) and the second outer step (19) are provided on the inner surface of the main shaft channel (2), and a plurality of bearings (22) are sleeved on the main shaft (3) and are respectively located on the two sides of the positioning boss (17), the bearings (22) are abutted against each other, and the inner and outer rings of the bearings (22) are respectively in contact with the main shaft ( 3) The outer surface of the bearing (22) abuts against the inner surface of the main shaft channel (2); the outer ends of the inner and outer rings of the bearing (22) closest to the first outer step (18) abut against the first outer step (18) and the first inner step (20) respectively; the outer end of the bearing (22) farthest from the first outer step (18) on the same side is provided with a first sealing locator (23); the outer ends of the inner and outer rings of the bearing (22) closest to the second outer step (19) abut against the second outer step (19) and the second inner step (21) respectively; the outer end of the bearing (22) farthest from the second outer step (19) on the same side is provided with a second sealing locator (24).

6. The large diameter headstock of the cylindrical grinding machine according to claim 5, characterized in that: The first sealing positioning member (23) comprises a first flange (25) sleeved on the front end of the main shaft (3); a positioning inner step (26) is provided on the front end of the main shaft (3); the outer end of the first flange (25) abuts against the positioning inner step (26); the first flange (25) is fixedly connected to the outer end of the main shaft channel (2); the inner end of the first flange (25) abuts against the bearing (22); and the inner end of the first flange (25) is also provided with a first positioning step (27) adapted to the outer end of the main shaft channel (2).

7. The large diameter headstock of the cylindrical grinding machine according to claim 6, characterized in that: The first flange (25) is a labyrinth flange.

8. The large diameter headstock of the cylindrical grinding machine according to claim 5, characterized in that: The second sealing positioning member (24) comprises a second flange (28) sleeved on the rear end of the main shaft (3); the second flange (28) is fixedly connected to the outer end of the main shaft passage (2); the inner end of the second flange (28) and the bearing (22) are in contact with each other; the inner end of the second flange (28) is provided with a second positioning step (29) adapted to the outer end of the main shaft passage (2); the outer end of the second flange (28) is provided with a positioning groove (30); a positioning sleeve (31) sleeved on the main shaft (3) is provided in the positioning groove (30); the positioning sleeve (31) is fixedly connected to the main shaft (3).

9. The large diameter headstock of the cylindrical grinding machine according to claim 5, characterized in that: The number of bearings (22) on the side close to the first outer step (18) is four, and the number of bearings (22) on the side close to the second outer step (19) is two.

10. The large diameter headstock of a cylindrical grinding machine according to any one of claims 1 to 9, characterized in that: The driving assembly (9) comprises a servo motor (32) arranged above the body shell (1); the output end of the servo motor (32) is coaxially connected to a reducer (33); the output end of the reducer (33) is coaxially connected to a driving wheel (34); the driving wheel (34) and the driven wheel (8) are connected by a synchronous belt (35); and the reducer (33) is fixed to the body shell (1) by a fixing seat (36).

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