High-precision grinding head assembly of large-span grinding machine

Abstract

The high-precision grinding head assembly of the large-span grinding machine comprises a motor, a grinding head body, a transmission shaft, a coupler, a main shaft, a grinding wheel chuck and a grinding wheel, a connecting base is arranged on the rear end face of the grinding head body, the motor is arranged at the end, away from the grinding head body, of the connecting base, and the transmission shaft and the main shaft are rotationally arranged in the connecting base and the grinding head body respectively. One end of the transmission shaft is connected with an output shaft of the motor, the other end of the transmission shaft extends into the grinding head body and is connected with the rear end of the spindle through the coupler, the grinding wheel chuck is arranged at the front end of the spindle, the grinding wheel is arranged on the grinding wheel chuck, and the spindle front end and the spindle rear end are supported in the grinding head body through the first rolling bearing and the double-row roller bearing respectively. The grinding head has the beneficial effects that the rigidity and the rotating precision of the grinding head can be ensured, the vibration of the main shaft is smaller, the grinding roughness value is lower, the smoothness is good, the overall work is stable and reliable, and the machining effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing equipment, and in particular relates to a high-precision grinding head component of a large-span grinding machine. Background Art

[0002] A grinder is a machine tool that uses abrasive tools to grind the surface of a workpiece. The main structure of a grinder includes a motor, a spindle and a grinding wheel. The spindle is connected to the output shaft of the motor through a coupling, and the grinding wheel is installed on the spindle. The motor drives the grinding wheel to rotate at high speed through the spindle for grinding.

[0003] The machining accuracy of the grinder will be affected by the motion accuracy and relative position accuracy of each component. For grinders with larger spans, since the distance between the output shaft of the motor and the spindle is larger than that of conventional grinders, they need to be connected through an extended coupling, which causes greater vibration of the spindle, increases the roughness of the grinding process, and reduces the machining effect. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a high-precision grinding head assembly for a large-span grinder, which can ensure the rigidity and rotation accuracy of the grinding head, reduce the vibration of the spindle, and ensure a low grinding roughness value and good finish. The overall operation is stable and reliable, and the processing effect is good.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A high-precision grinding head assembly for a large-span grinder includes a motor and a grinding head body, and also includes a transmission shaft, a coupling, a spindle, a grinding wheel chuck and a grinding wheel. A connecting seat is provided on the rear end face of the grinding head body, and the motor is arranged at one end of the connecting seat away from the grinding head body. The transmission shaft and the spindle are rotatably arranged in the connecting seat and the grinding head body respectively. One end of the transmission shaft is connected to the output shaft of the motor, and the other end of the transmission shaft extends into the grinding head body and is connected to the rear end of the spindle through a coupling. The grinding wheel chuck is arranged at the front end of the spindle, and the grinding wheel is arranged on the grinding wheel chuck. The front end and the rear end of the spindle are respectively supported in the grinding head body through a first rolling bearing and a double-row roller bearing.

[0007] Furthermore, bearing sleeves are provided at both ends of the transmission shaft, and the two bearing sleeves are respectively connected to one end of the connecting seat close to the motor and the rear end of the grinding head body. A second rolling bearing is provided in the bearing sleeve and is sleeved on the transmission shaft. Bearing pressure covers corresponding to the two bearing sleeves are also provided at both ends of the transmission shaft. The bearing pressure covers are connected to the corresponding bearing sleeves and abut against the second rolling bearing.

[0008] Furthermore, the output shaft of the motor is inserted into the end of the transmission shaft and connected to the transmission shaft through a flat key.

[0009] Furthermore, a grinding wheel and a grinding wheel pressure cover are sequentially sleeved on the grinding wheel chuck, the grinding wheel pressure cover presses the grinding wheel onto the grinding wheel chuck, and the grinding wheel pressure cover is connected to the grinding wheel chuck via screws.

[0010] Furthermore, the grinding wheel chuck is sleeved on the front end of the main shaft, and the front end of the main shaft is threadedly sleeved with a first locking nut that abuts against the grinding wheel chuck.

[0011] Furthermore, a second locking nut for fixing the axial position of the first rolling bearing is threadedly sleeved on the main shaft.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The utility model connects the output shaft and the main shaft of the motor through the transmission shaft, and then transmits the torque of the motor through the transmission shaft. Both ends of the transmission shaft are supported by bearings, which have sufficient rigidity and stable and reliable operation. It is more stable than using an extended coupling alone, the main shaft vibrates less, the grinding roughness value is lower, and the finish is better.

[0014] 2. The main shaft of the utility model adopts a combination of double-row roller bearings and rolling bearings, which can ensure the rigidity and rotation accuracy of the grinding head. Compared with the grinding head that adopts all rolling bearings, the processing effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 for Figure 1 A schematic diagram of the structure enlargement at point A;

[0017] Figure 3 for Figure 1 A schematic diagram of the structure at B in FIG.

[0018] Figure 4 for Figure 1 Schematic diagram of the enlarged structure at position C in FIG.

[0019] In the figure: 1. electric motor; 2. grinding head body; 3. transmission shaft; 4. coupling; 5. main shaft; 6. grinding wheel chuck; 7. grinding wheel; 8. connecting seat; 9. first rolling bearing; 10. double-row roller bearing; 11. bearing sleeve; 12. second rolling bearing; 13. bearing cover; 14. flat key; 15. grinding wheel cover; 16. first locking nut; 17. locking screw. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0021] As shown in FIG1 , a high-precision grinding head assembly for a large-span grinder includes a motor 1, a grinding head body 2, a coupling 4, a transmission shaft 3, a spindle 5, a grinding wheel chuck 6 and a grinding wheel 7. The spindle 5 is rotatably arranged in the grinding head body 2, and the two ends of the spindle 5 are respectively the front end of the spindle 5 and the rear end of the spindle 5. The output shaft of the motor 1 is connected to the rear end of the spindle 5 through the coupling 4, the grinding wheel chuck 6 is arranged at the front end of the spindle 5, and the grinding wheel 7 is arranged on the grinding wheel chuck 6. The motor 1 drives the spindle 5 to rotate at high speed through the coupling 4, and then drives the grinding wheel 7 to rotate at high speed for grinding.

[0022] like Figure 3 As shown, the grinding wheel chuck 6 is sleeved on the front end of the spindle 5, and the front end of the spindle 5 is threadedly sleeved with a first locking nut 16 that abuts against the grinding wheel chuck 6, and then the grinding wheel chuck 6 is fixed by the first locking nut 16 to prevent the grinding wheel chuck 6 from falling off. The grinding wheel chuck 6 is sequentially sleeved with a grinding wheel 7 and a grinding wheel pressure cover 15, and the grinding wheel pressure cover 15 presses the grinding wheel 7 onto the grinding wheel chuck 6 and the grinding wheel pressure cover 15 is connected to the grinding wheel chuck 6 by screws, thereby realizing the installation and fixation of the grinding wheel 7.

[0023] In order to prevent the distance between the motor 1 and the spindle 5 from being too large, which will cause the spindle 5 to vibrate too much, thereby increasing the grinding roughness and reducing the processing effect, a transmission shaft 3 is added between the motor 1 and the spindle 5. Figure 1 , Figure 2 As shown, a connecting seat 8 is installed on the rear end surface of the grinding head body 2 by bolts, and the motor 1 is installed at the end of the connecting seat 8 away from the grinding head body 2. Bearing sleeves 11 are provided at both ends of the transmission shaft 3. The two bearing sleeves 11 are respectively connected and installed on the end of the connecting seat 8 close to the motor 1 and the rear end of the grinding head body 2 by bolts. A second rolling bearing 12 is provided in the bearing sleeve 11 and is sleeved on the transmission shaft 3. Then, the transmission shaft 3 is rotatably supported in the connecting seat 8 by the two second rolling bearings 12. Bearing pressure covers 13 corresponding to the two bearing sleeves 11 are also provided at both ends of the transmission shaft 3. The bearing pressure covers 13 are connected to the corresponding bearing sleeves 11 by bolts and abut against the second rolling bearings 12. Then, the second rolling bearings 12 are fixed by the bearing pressure covers 13. The output shaft of the motor 1 is inserted into one end of the transmission shaft 3 and is connected to the transmission shaft 3 through a flat key 14. The other end of the transmission shaft 3 extends into the grinding head body 2 and is connected to the rear end of the main shaft 5 through a coupling 4.

[0024] The transmission shaft 3 is supported by the second rolling bearing 12 and has sufficient rigidity. The torque of the motor 1 is transmitted through the transmission shaft 3, which is more stable than using the extended coupling 4 alone, thereby reducing the vibration amplitude of the main shaft 5, reducing the grinding roughness, and improving the processing finish and processing effect.

[0025] In order to further improve the processing effect, such as Figure 1 , Figure 3As shown, the front end and the rear end of the main shaft 5 are supported in the grinding head body 2 by the first rolling bearing 9 and the double-row roller bearing 10 respectively, and the second locking nut 17 for fixing the axial position of the first rolling bearing 9 is threadedly sleeved on the main shaft 5. The combination of the first rolling bearing 9 and the double-row roller bearing 10 can ensure the rigidity and rotation accuracy of the grinding head, and the processing effect is better than that of the grinding head using all rolling bearings.

[0026] Finally, although the above description has shown and described the embodiments of the present invention, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision grinding head assembly for a large-span grinding machine, comprising a motor (1) and a grinding head body (2), characterized in that: The invention also comprises a transmission shaft (3), a coupling (4), a main shaft (5), a grinding wheel chuck (6) and a grinding wheel (7); a connecting seat (8) is provided on the rear end surface of the grinding head body (2); the motor (1) is arranged at one end of the connecting seat (8) away from the grinding head body (2); the transmission shaft (3) and the main shaft (5) are rotatably arranged in the connecting seat (8) and the grinding head body (2) respectively; one end of the transmission shaft (3) is connected to the output shaft of the motor; the other end of the transmission shaft (3) extends into the grinding head body (2) and is connected to the rear end of the main shaft (5) through the coupling (4); the grinding wheel chuck (6) is arranged at the front end of the main shaft (5); the grinding wheel (7) is arranged on the grinding wheel chuck (6); the front end of the main shaft (5) and the rear end of the main shaft (5) are supported in the grinding head body (2) through a first rolling bearing (9) and a double-row roller bearing (10) respectively.

2. The high-precision grinding head assembly for a large-span grinder according to claim 1, characterized in that: Bearing sleeves (11) are sleeved on both ends of the transmission shaft (3); the two bearing sleeves (11) are respectively connected to one end of the connection seat (8) close to the motor (1) and the rear end of the grinding head body (2); a second rolling bearing (12) sleeved on the transmission shaft (3) is arranged in the bearing sleeve (11); bearing pressure covers (13) corresponding to the two bearing sleeves (11) are sleeved on both ends of the transmission shaft (3); the bearing pressure covers (13) are connected to the corresponding bearing sleeves (11) and abut against the second rolling bearing (12).

3. The high-precision grinding head assembly for a large-span grinder according to claim 1, characterized in that: The output shaft of the motor (1) is inserted into the end of the transmission shaft (3) and connected to the transmission shaft (3) via a flat key (14).

4. The high-precision grinding head assembly for a large-span grinder according to claim 1, characterized in that: A grinding wheel (7) and a grinding wheel pressure cover (15) are sequentially sleeved on the grinding wheel chuck (6); the grinding wheel pressure cover (15) presses the grinding wheel (7) onto the grinding wheel chuck (6) and the grinding wheel pressure cover (15) is connected to the grinding wheel chuck (6) via screws.

5. The high-precision grinding head assembly for a large-span grinder according to claim 1, characterized in that: The grinding wheel chuck (6) is sleeved on the front end of the main shaft (5), and the front end of the main shaft (5) is threadedly sleeved with a first locking nut (16) that abuts against the grinding wheel chuck (6).

6. The high-precision grinding head assembly for a large-span grinder according to claim 1, characterized in that: A second locking nut (17) is threadedly sleeved on the main shaft (5) to fix the axial position of the first rolling bearing (9).

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