Numerical control cylindrical grinding wheel spindle structure

Abstract

The utility model provides a numerical control outer circle grinding wheel spindle structure which comprises a spindle seat, a bearing bush and a spindle, the bearing bush and the spindle are arranged in a spindle cavity of the spindle seat, the bearing bush is connected with the spindle in a rotating friction mode, the front end of the spindle extends out of the spindle seat, and the spindle seat comprises a seat body and an upper cover fixedly connected with the seat body. The seat body and the upper cover define the main shaft cavity, the bearing bush comprises a lower bearing bush and an upper bearing bush, the lower bearing bush is arranged on the lower surface of the main shaft cavity and fixedly connected with the seat body, the upper bearing bush covers the main shaft, and an abutting groove is formed in the outer surface, close to the upper cover, of the upper bearing bush. The upper cover is provided with an adjusting screw corresponding to the abutting groove in position, the tail end of the adjusting screw abuts against the interior of the abutting groove, and the adjusting screw can adjust the gap between the upper bearing bush and the main shaft. The original precision of the main shaft can be recovered by adjusting the fit clearance between the front and rear bearing bushes and the grinding wheel main shaft, and the maintenance cost of the grinding wheel main shaft is reduced.

Description

Technical Field

[0001] The utility model relates to a cylindrical grinding machine tool processing structure, in particular to a numerical control cylindrical grinding wheel spindle structure. Background Art

[0002] Since the outer diameter of the guide pin and guide sleeve of the mold accessories usually needs to be processed by a cylindrical grinding machine. The grinding wheel spindle structure of the existing cylindrical grinding machine is an integral structure in which the bearing and the spindle sleeve are inlaid together. The main function of the bearing is to protect the spindle from friction when it is running at high speed. There is an oil hole in the middle of the bearing. After starting, the lubricating oil will lubricate the spindle through the oil hole. The bearing should have a certain rigidity and strength to facilitate the input of lubricants, and it also plays an important role in the heat dissipation when the spindle rotates at high speed. In the existing one-piece structure, the grinding wheel spindle structure is an integral structure in which the bearing and the spindle sleeve are inlaid together, that is, the bearing cannot be disassembled. After a long period of use, the wear of the spindle and the bearing causes the matching clearance to increase, the spindle vibrates greatly, and the normal use of the machine is affected. During maintenance, the entire set needs to be replaced, so the maintenance cost is high. Utility Model Content

[0003] In order to solve the problems in the prior art, the utility model provides a CNC external cylindrical grinding wheel spindle structure, the clearance between the bearing and the spindle can be adjusted at any time, and when the bearing cannot be used, it can be easily replaced, thereby reducing maintenance costs.

[0004] The utility model includes a spindle seat, a bearing shell arranged in a spindle cavity of the spindle seat, and a spindle, the bearing shell being rotationally frictionally connected to the spindle, the front end of the spindle extending from the spindle seat, the spindle seat including a seat body and an upper cover fixedly connected to the seat body, the seat body and the upper cover enclose the spindle cavity, the bearing shell including a lower bearing shell and an upper bearing shell, the lower bearing shell being arranged on the lower surface of the spindle cavity and fixedly connected to the seat body, the upper bearing shell covering the spindle, and an abutment groove being provided on the outer surface of the upper bearing shell close to the upper cover, an adjusting screw corresponding to the position of the abutment groove being provided on the upper cover, the end of the adjusting screw abuttingly ...

[0005] The utility model is further improved in that an oil gauge seat is provided on the upper cover, and an oil gauge mirror capable of observing the circulation state of the main shaft oil is provided on the oil gauge seat.

[0006] The utility model is further improved, the CNC external cylindrical grinding wheel spindle structure also includes a front cover arranged at the front end of the spindle seat and a rear cover arranged at the rear end of the spindle seat, and the front cover and the rear cover are both provided with a sealing structure for sealing the spindle cavity.

[0007] The utility model is further improved, the lower bearing shell includes a front lower bearing shell arranged at the front end of the main shaft seat, and a rear lower bearing shell arranged at the rear end of the main shaft seat, and the upper bearing shell includes a front upper bearing shell arranged at the front end of the main shaft seat, and a rear upper bearing shell arranged at the rear end of the main shaft seat.

[0008] The utility model is further improved in that the number of the front lower bearing shell and the rear lower bearing shell is one respectively, and the number of the front upper bearing shell and the rear upper bearing shell is two respectively, which are symmetrically arranged on both sides of the central axis of the upper cover.

[0009] The utility model is further improved, the CNC external cylindrical grinding wheel spindle structure also includes a rotating driving wheel arranged at the rear end of the rear cover, and the rotating driving wheel is fixedly connected to the spindle through a bearing locking nut in the rear cover.

[0010] The utility model is further improved in that at least one plane bearing is arranged between the rear cover and the main shaft seat, and the inner ring of the plane bearing is arranged between the main shaft and the bearing locking nut.

[0011] The utility model is further improved in that the spindle cavities on the upper surface of the seat body and the lower surface of the upper cover are both semicircular, and the spindle seat is fixedly connected to the side wall of the upper cover by a plurality of bolts.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the bearing is divided into an upper bearing and a lower bearing, and an adjusting screw matching the upper bearing is provided on the upper cover; when the grinding wheel spindle is worn after being used for a period of time, the original accuracy of the machine tool spindle can be restored by adjusting the matching clearance between the front and rear bearings and the grinding wheel spindle, thereby reducing the maintenance cost of the grinding wheel spindle and increasing the service life of the cylindrical grinding wheel spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0015] Figure 3 It is a schematic diagram of the lower bearing shell and the seat body structure;

[0016] Figure 4 Schematic diagram of the upper bearing structure. DETAILED DESCRIPTION

[0017] The purpose of the utility model is to reduce the labor intensity of operators when drilling holes in sleeve-type workpieces, improve work efficiency, reduce production costs, and thus improve the competitiveness of the company's products in the market. The utility model changes the traditional design concept and makes a new transformation on the basis of the existing manual feeding structure, adopting the feeding method of automatic feeding drilling. The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] like Figure 1 As shown, the CNC external cylindrical grinding wheel spindle structure of the utility model includes a spindle seat, the spindle seat includes a seat body 3 and an upper cover 9 fixedly connected to the seat body 3, the seat body 3 and the upper cover 9 enclose a spindle cavity, the CNC external cylindrical grinding wheel spindle structure also includes a front cover 2 arranged at the front end of the spindle seat and a rear cover 4 arranged at the rear end of the spindle seat, and the rear end is provided with a rotating driving wheel 5 for driving the spindle 1 to rotate. The rotating driving wheel 5 in this example is a pulley matched with a belt.

[0019] The spindle cavity of the spindle seat is provided with a bearing and a spindle 1, the bearing is frictionally connected with the spindle, and the front end of the spindle 1 extends from the front cover 2. In this example, since the spindle 1 generates a lot of heat during operation, the spindle oil for circulating cooling and lubricating the spindle is passed through the spindle seat. In order to facilitate observation of the circulation state of the spindle oil, an oil gauge seat 8 is also provided on the upper cover 9, and an oil gauge mirror 7 for observing the circulation state of the spindle oil is provided on the oil gauge seat 8. Spindle oil circulation cooling and lubrication is an existing technology for the spindle, which will not be described in detail here.

[0020] like Figure 2 As shown, since spindle oil for circulating cooling and lubricating the spindle is passed through the inside of the spindle seat, in order to achieve a sealing effect, in this example, oil seal structures 10, 12 for sealing the spindle cavity are provided at the connection between the front cover 2 and the spindle seat and at the connection between the rear cover 4 and the spindle seat.

[0021] The rotating driving wheel 5 of this example is fixedly connected to the main shaft 1 through the bearing locking nut 11 in the rear cover 4. Preferably, in this example, one or more plane bearings 13 are further provided between the rear cover 4 and the main shaft seat, and the inner ring of the plane bearing 13 is provided between the main shaft 1 and the bearing locking nut 11. The number of the plane bearings 13 in this example is two, and the two plane bearings 13 installed at the rear end of the main shaft 1 can effectively control the axial stringing of the main shaft.

[0022] like Figure 1-4As shown, the bearing shell in this example includes a lower bearing shell and an upper bearing shell. The lower bearing shell is arranged on the lower surface of the main shaft cavity and is fixedly connected to the seat body 3. The upper bearing shell covers the main shaft 1, and the outer surface of the upper bearing shell close to the upper cover is provided with an abutment groove. The upper cover 9 is provided with an adjusting screw 6 corresponding to the position of the abutment groove, and the end of the adjusting screw 6 abuts in the abutment groove. The adjusting screw can adjust the gap between the upper bearing shell and the main shaft.

[0023] The utility model divides the bearing into an upper bearing and a lower bearing, and an adjusting screw 6 matched with the upper bearing is provided on the upper cover. When the grinding wheel spindle is worn after being used for a period of time, the original accuracy of the machine tool spindle can be restored by adjusting the matching clearance between the front and rear bearings and the grinding wheel spindle. In addition, the upper bearing, the lower bearing and the spindle are separated. When the bearing can no longer be used, one of them can be replaced separately, thereby reducing the cost of repairing the grinding wheel spindle and increasing the service life of the cylindrical grinding wheel spindle.

[0024] During normal use, the spindle is affected by gravity and will stick to the lower bearing. During use, as the spindle, the lower bearing and the upper bearing wear, the clearance between the spindle and the bearing becomes larger, and the spindle moves down with the lower bearing. However, there is a gap between the upper bearing and the upper cover 9, which causes the upper bearing to vibrate greatly due to the larger gap with the upper cover when the spindle rotates. The utility model provides an adjusting screw 6 on the upper cover 9, and adjusts the adjusting screw 6 to tighten the upper bearing, so that the upper bearing will not vibrate during the rotation of the spindle, and the upper bearing can always be in good contact with the spindle. Therefore, through the structure of the utility model, the original accuracy of the machine tool spindle can be restored by adjusting the clearance between the upper and lower bearings and the grinding wheel spindle.

[0025] Preferably, in order to make the spindle 1 run more smoothly, a group of upper and lower bearings that cooperate with each other are arranged at the front and rear ends of the spindle cavity 18. Specifically, in this example, the lower bearing includes a front lower bearing 17 arranged at the front end of the spindle seat, and a rear lower bearing 15 arranged at the rear end of the spindle seat, and the upper bearing includes a front upper bearing 16 arranged at the front end of the spindle seat, and a rear upper bearing 14 arranged at the rear end of the spindle seat.

[0026] The spindle cavities on the upper surface of the seat body 3 and the lower surface of the upper cover 9 are both semicircular, and the spindle seat is fixedly connected to the side wall of the upper cover by a plurality of bolts. An oil inlet hole for spindle oil is provided at the bottom of the spindle cavity 18, and a plurality of spindle oil circulation holes 19 are also provided on the front lower bearing 17 and the rear lower bearing 15.

[0027] Preferably, in this example, the number of the front upper bearing 16 is two, including the first front upper bearing 161 and the second front upper bearing 162, the number of the rear upper bearing 14 is two, including the first rear upper bearing 141 and the second rear upper bearing 142, the first front upper bearing 161 and the second front upper bearing 162, the first rear upper bearing 141 and the second rear upper bearing 142 have the same area, and are symmetrically arranged on both sides of the central axis of the upper cover 9, respectively, and the front upper bearing 16 and the rear upper bearing 14 are set to two, and the position relationship is adjusted by adjusting screws 6 respectively, so that they can better fit with the main shaft 1. In addition, the first gap 163 between the first front upper bearing 161 and the second front upper bearing 162, and the second gap between the first rear upper bearing 141 and the second rear upper bearing 142 can be used as flow channels for circulating spindle oil for cooling and lubricating the spindle, so that there is no need to open holes in the front upper bearing 16 and the rear upper bearing 14.

[0028] In summary, the utility model adopts a detachable grinding wheel spindle bearing structure, and the front and rear upper bearings are both provided with adjusting screws to adjust the matching clearance between the bearing and the spindle; while the traditional external cylindrical grinding machine tool grinding wheel spindle structure is mainly an integral structure in which the bearing of the grinding wheel spindle and the spindle sleeve are inlaid together, and the bearing is not detachable. After a long period of use, the spindle and the bearing will wear out, which will cause the matching clearance to become larger, and the spindle will vibrate greatly, affecting the normal use of the machine. The bearing of the grinding wheel spindle of the CNC external cylindrical grinding machine tool is detachable and the clearance can be adjusted. In terms of design structure, they are two completely different design concepts. The utility model has the advantages of convenient clearance adjustment and low maintenance cost. The CNC external cylindrical grinding wheel spindle structure is reasonably designed and has good actual use effect.

[0029] The specific implementation methods described above are preferred implementation methods of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. A CNC external cylindrical grinding wheel spindle structure, comprising a spindle seat, a bearing bush arranged in a spindle cavity of the spindle seat, and a spindle, wherein the bearing bush is frictionally connected with the spindle in rotation, and the front end of the spindle extends from the spindle seat, characterized in that: The main shaft seat includes a seat body and an upper cover fixedly connected to the seat body, the seat body and the upper cover enclose the main shaft cavity, the bearing shell includes a lower bearing shell and an upper bearing shell, the lower bearing shell is arranged on the lower surface of the main shaft cavity and is fixedly connected to the seat body, the upper bearing shell covers the main shaft, and the outer surface of the upper bearing shell close to the upper cover is provided with an abutment groove, the upper cover is provided with an adjusting screw corresponding to the position of the abutment groove, the end of the adjusting screw abuts in the abutment groove, and the adjusting screw can adjust the gap between the upper bearing shell and the main shaft.

2. The CNC cylindrical grinding wheel spindle structure according to claim 1 is characterized in that: An oil gauge seat is also provided on the upper cover, and an oil gauge mirror capable of observing the oil circulation state of the main shaft is provided on the oil gauge seat.

3. The CNC external cylindrical grinding wheel spindle structure according to claim 1 is characterized in that: The CNC external cylindrical grinding wheel spindle structure also includes a front cover arranged at the front end of the spindle seat and a rear cover arranged at the rear end of the spindle seat. Both the front cover and the rear cover are provided with a sealing structure for sealing the spindle cavity.

4. The CNC external cylindrical grinding wheel spindle structure according to claim 3 is characterized in that: The lower bearing shell includes a front lower bearing shell arranged at the front end of the main shaft seat, and a rear lower bearing shell arranged at the rear end of the main shaft seat. The upper bearing shell includes a front upper bearing shell arranged at the front end of the main shaft seat, and a rear upper bearing shell arranged at the rear end of the main shaft seat.

5. The CNC external cylindrical grinding wheel spindle structure according to claim 4 is characterized in that: The number of the front lower bearing shell and the rear lower bearing shell is one respectively, and the number of the front upper bearing shell and the rear upper bearing shell is two respectively, which are symmetrically arranged on both sides of the central axis of the upper cover.

6. The CNC external cylindrical grinding wheel spindle structure according to claim 3 is characterized in that: The CNC external cylindrical grinding wheel spindle structure also includes a rotating driving wheel arranged at the rear end of the rear cover, and the rotating driving wheel is fixedly connected to the spindle through a bearing locking nut in the rear cover.

7. The CNC cylindrical grinding wheel spindle structure according to claim 6 is characterized in that: One or more plane bearings are arranged between the rear cover and the main shaft seat, and the inner ring of the plane bearing is arranged between the main shaft and the bearing locking nut.

8. The CNC cylindrical grinding wheel spindle structure according to any one of claims 1 to 7, characterized in that: The spindle cavities on the upper surface of the seat body and the lower surface of the upper cover are both semicircular, and the spindle seat is fixedly connected to the side wall of the upper cover by a plurality of bolts.

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