阅读说明：本技术 一种风电齿轮箱箱盖的装夹装置 (Clamping device of wind-powered electricity generation gear box case lid ) 是由 肖坡 华刚 曹荣青 王炯 于 2020-08-24 设计创作，主要内容包括：本发明公开了一种风电齿轮箱箱盖的装夹装置,属于机械加工技术领域。所述风电齿轮箱箱盖的装夹装置,其包括第一基座和第二基座、第一夹紧单元和第二夹紧单元、第一压紧单元和第二压紧单元,以及调整单元,其中,第一基座和第二基座分别与工作台滑动连接,并能够支撑箱盖；第一夹紧单元和第二夹紧单元分别设置在第一基座和第二基座上,并分别用于第一轴承孔和第二轴承孔的定位；第一压紧单元和第二压紧单元与工作台滑动连接,分别用于压紧第一轴承孔和第二轴承孔的上端面；调整单元设置在工作台上,能够抵接在箱盖的底面边缘,用于支撑并调整箱盖的高度。本发明的风电齿轮箱箱盖的装夹装置,通用性好,提高了生产效率和降低了生产成本。(The invention discloses a clamping device for a wind power gear box cover, and belongs to the technical field of machining. The clamping device for the wind power gear box cover comprises a first base, a second base, a first clamping unit, a second clamping unit, a first pressing unit, a second pressing unit and an adjusting unit, wherein the first base and the second base are respectively connected with a workbench in a sliding mode and can support the box cover; the first clamping unit and the second clamping unit are respectively arranged on the first base and the second base and are respectively used for positioning the first bearing hole and the second bearing hole; the first pressing unit and the second pressing unit are connected with the workbench in a sliding mode and are respectively used for pressing the upper end faces of the first bearing hole and the second bearing hole; the adjusting unit is arranged on the workbench, can abut against the edge of the bottom surface of the box cover and is used for supporting and adjusting the height of the box cover. The clamping device for the wind power gear box cover has good universality, improves the production efficiency and reduces the production cost.)

1. The utility model provides a clamping device of wind-powered electricity generation gear box case lid, has seted up first bearing hole (201) and second bearing hole (202) on case lid (200), and clamping device installs on workstation (100), its characterized in that includes:

a first base (11) and a second base (12) which are respectively connected with the workbench (100) in a sliding way and can support the box cover (200);

a first clamping unit and a second clamping unit which are respectively arranged on the first base (11) and the second base (12) and are respectively used for positioning the first bearing hole (201) and the second bearing hole (202);

the first pressing unit (31) and the second pressing unit (32) are connected with the workbench (100) in a sliding mode and are respectively used for pressing the upper end face of the first bearing hole (201) and the upper end face of the second bearing hole (202);

and an adjusting unit which is arranged on the workbench (100), can abut against the bottom edge of the box cover (200) and is used for supporting and adjusting the height of the box cover (200).

2. The clamping device for the cover of the wind power gearbox box according to claim 1,

the first clamping unit comprises a self-centering three-jaw chuck assembly (21), the self-centering three-jaw chuck assembly (21) is used for bracing the first bearing hole (201);

the second clamping unit comprises a self-centering two-jaw chuck assembly (22), the self-centering two-jaw chuck assembly (22) being used for bracing the second bearing hole (202).

3. The clamping device for the cover of the wind power gearbox box according to claim 2,

the first base (11) comprises a first body part (111) and a plurality of first supporting ribs (112) arranged around the circumference of the first body part (111), the top surfaces of the first supporting ribs (112) can be abutted with the lower end surface of the first bearing hole (201) of the box cover (200), and the plurality of first supporting ribs (112) and the first body part (111) are enclosed to form a first accommodating groove for accommodating the self-centering three-jaw chuck assembly (21);

the second base (12) comprises a second body part (121) and a plurality of second supporting ribs (122) arranged around the circumference of the second body part (121), the top surfaces of the second supporting ribs (122) can be abutted against the lower end surface of the second bearing hole (202) of the box cover (200), and the plurality of second supporting ribs (122) and the second body part (121) enclose a second accommodating groove for accommodating the self-centering two-jaw chuck assembly (22).

4. The clamping device for the cover of the wind power gearbox box according to claim 3,

the plurality of first supporting ribs (112) are uniformly arranged at intervals along the circumferential direction of the first body part (111); the second support ribs (122) are arranged at equal intervals along the circumferential direction of the second body part (121).

5. The clamping device for the cover of the wind power gearbox box according to claim 4,

the self-centering three-jaw chuck assembly (21) is in transition fit with the first accommodating groove, and the first body part (111) is connected with the self-centering three-jaw chuck assembly (21) through a fastener; the self-centering two-jaw chuck assembly (22) is in transition fit with the second accommodating groove, and the second body part (121) is connected with the self-centering two-jaw chuck assembly (22) through a fastener.

6. The clamping device for the wind power gearbox cover according to any one of claims 1 to 5, wherein a T-shaped groove (101) is formed in the workbench (100), and sliding blocks are arranged at the bottoms of the first base (11) and the second base (12) and are in sliding connection with the T-shaped groove (101).

7. The clamping device for the cover of the wind power gearbox according to claim 6, characterized in that the adjusting unit comprises a plurality of jacks (41), the bottom ends of the jacks (41) are arranged on the workbench (100), and the top rods of the jacks (41) can abut against the edge of the bottom surface of the cover (200).

8. The clamping device for the cover of the wind power gearbox box according to claim 7, characterized in that the parallelism tolerance of the bottom surface of the cover (200) and the workbench (100) is less than 0.1 mm.

9. The clamping device for the wind power gearbox cover according to claim 6, wherein through holes are formed in the first base (11), the second base (12), the first clamping unit and the second clamping unit respectively;

the first pressing unit (31) comprises a first screw (311) penetrating through the first base (11) and the through hole of the first clamping unit, a first pressing plate (312) used for pressing the upper end face of the first bearing hole (201) of the box cover (200) is installed at one end of the first screw (311), a sliding block is arranged at the other end of the first screw (311), and the sliding block is connected with the T-shaped groove (101) in a sliding mode;

the second pressing unit (32) comprises a second screw rod (321) penetrating through the second base (12) and the through hole of the second clamping unit, a second pressing plate (322) used for pressing the upper end face of the second bearing hole (202) of the box cover (200) is installed at one end of the second screw rod (321), a sliding block is arranged at the other end of the second screw rod (321), and the sliding block is connected with the T-shaped groove (101) in a sliding mode.

10. The clamping device for the wind power gearbox cover as recited in claim 9, wherein the first screw (311) and the first pressing plate (312) are connected through a hexagonal flange nut; the second screw rod (321) is connected with the second pressing plate (322) through a hexagonal flange nut.

Technical Field

The invention relates to the technical field of machining, in particular to a clamping device for a wind power gear box cover.

Background

The milling surface of the wind power gearbox cover is a first finish machining process after rough machining, for a traditional vertical machining center, the connecting line of the centers of two bearing holes can be corrected to be parallel to the X axis of a machine tool only according to the drop of the two bearing holes in the diameter direction, and one bearing hole is used as a programming zero point to mill the surface of the box cover and machine threaded holes and positioning pin holes in the box closing surface. However, the position of the bearing hole on the Y axis of the machine tool needs to be adjusted for multiple times by the correction method to meet the condition that the central connecting line of the two bearing holes is parallel to the X axis of the machine tool, so that the auxiliary consumption time of assembly, correction and the like is more than the normal processing time of parts, and the processing production efficiency is reduced; in addition, in the prior art, the clamping devices are fixed in distance and can only be used for milling the surface of one wind power gearbox cover, the universality is poor, a plurality of clamping devices are required to be arranged when the box covers with different sizes and center distances are produced, time and labor are wasted due to frequent replacement, and the production cost is high.

Disclosure of Invention

The invention aims to provide a clamping device for a wind power gearbox cover, which is convenient to clamp and correct, good in universality, capable of improving the production efficiency and reducing the production cost.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a clamping device of wind-powered electricity generation gear box case lid, has seted up first bearing hole and second bearing hole on the case lid, and clamping device installs on the workstation, includes:

the first base and the second base are respectively connected with the workbench in a sliding manner and can support the box cover;

the first clamping unit and the second clamping unit are respectively arranged on the first base and the second base and are respectively used for positioning the first bearing hole and the second bearing hole;

the first pressing unit and the second pressing unit are connected with the workbench in a sliding mode and are respectively used for pressing the upper end face of the first bearing hole and the upper end face of the second bearing hole;

and the adjusting unit is arranged on the workbench, can abut against the edge of the bottom surface of the box cover and is used for supporting and adjusting the height of the box cover.

Optionally, the first clamping unit comprises a self-centering three-jaw chuck assembly for bracing the first bearing bore;

the second clamping unit includes a self-centering two-jaw chuck assembly for bracing the second bearing bore.

Optionally, the first base includes a first body portion and a plurality of first support ribs disposed around a circumferential direction of the first body portion, a top surface of the first support rib is capable of abutting against a lower end surface of the first bearing hole of the case lid, and the plurality of first support ribs and the first body portion enclose a first accommodating groove for accommodating the self-centering three-jaw chuck assembly;

the second base comprises a second body part and a plurality of second supporting ribs arranged around the circumferential direction of the second body part, the top surfaces of the second supporting ribs can be abutted to the lower end surface of the second bearing hole of the box cover, and the second accommodating groove for accommodating the self-centering two-jaw chuck assembly is formed by the second supporting ribs and the second body part in an enclosing mode.

Optionally, the plurality of first supporting ribs are uniformly arranged at intervals along the circumferential direction of the first body part; the plurality of second supporting ribs are uniformly arranged at intervals along the circumferential direction of the second body part.

Optionally, the self-centering three-jaw chuck assembly is in transition fit with the first accommodating groove, and the first body part is connected with the self-centering three-jaw chuck assembly through a fastener; the self-centering two-jaw chuck assembly is in transition fit with the second accommodating groove, and the second body part is connected with the self-centering two-jaw chuck assembly through a fastener.

Optionally, a T-shaped groove is formed in the workbench, and sliding blocks are arranged at the bottoms of the first base and the second base and are connected with the T-shaped groove in a sliding manner.

Optionally, the adjusting unit comprises a plurality of jacks, bottom ends of the jacks are arranged on the workbench, and top rods of the jacks can abut against the bottom edge of the box cover.

Optionally, the bottom surface of the cover has a parallelism tolerance of less than 0.1mm with the table.

Optionally, through holes are respectively formed in the first base, the second base, the first clamping unit and the second clamping unit;

the first pressing unit comprises a first screw rod penetrating through the through holes of the first base and the first clamping unit, a first pressing plate used for pressing the upper end face of the first bearing hole of the box cover is installed at one end of the first screw rod, a sliding block is arranged at the other end of the first screw rod, and the sliding block is connected with the T-shaped groove in a sliding mode;

the second pressing unit comprises a second screw rod penetrating through the through holes of the second base and the second clamping unit, a second pressing plate used for pressing the upper end face of the second bearing hole of the box cover is installed at one end of the second screw rod, a sliding block is arranged at the other end of the second screw rod, and the sliding block is connected with the T-shaped groove in a sliding mode.

Optionally, the first screw and the first pressure plate are connected through a hexagonal flange nut; the second screw rod is connected with the second pressure plate through a hexagonal flange nut.

The invention has the beneficial effects that:

according to the clamping device for the wind power gearbox cover, the first base and the second base are used for supporting the cover, so that the use of auxiliary tools is reduced, and the stability of the cover in the machining process is improved; the center distance between the first base and the second base is adjusted, so that the box cover is suitable for box covers with different center distances of the first bearing hole and the second bearing hole, and the applicability is improved; the first clamping unit and the second clamping unit are used for radially positioning the box cover so as to ensure the radial positioning precision of the box cover; the adjusting unit is used for auxiliary support and can be used for fine adjustment of the height of the box cover so as to ensure that the height difference of the whole processing plane is within a preset value and improve the axial positioning precision; the first pressing unit and the second pressing unit are used for clamping the box cover and are suitable for different box cover fall heights, so that the machining precision is improved; the clamping device is simple and compact in structure, convenient to operate and strong in applicability, the clamping correction time is shortened, the production efficiency is improved, and the production cost is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a clamping cover of a clamping device of a wind power gearbox cover according to a specific embodiment of the invention;

FIG. 2 is a partial schematic structural view of a clamping device of a wind turbine gearbox cover according to an embodiment of the invention;

FIG. 3 is a schematic structural diagram of a second base according to an embodiment of the present invention;

fig. 4 is a longitudinal sectional view of fig. 1.

In the figure:

100-a workbench; 101-T type groove;

200-box cover; 201-first bearing hole; 202-second bearing hole;

11-a first base; 111-a first body portion; 112-first support ribs; 113-a first base slider structure; 12-a second base; 121-a second body portion; 122-second support ribs; 123-base through hole; 124-mounting holes; 125-a second base slider structure; 21-a self-centering three-jaw chuck assembly; 211-a first jaw; 212-a first chuck base; 22-self-centering two jaw chuck assembly; 221-a second jaw; 222-a second chuck base;

31-a first pressing unit; 311-a first screw; 312 — a first platen; 32-a second pressing unit; 321-a second screw; 322-a second platen;

41-jack.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Generally, a first bearing hole 201 and a second bearing hole 202 are formed in the box cover 200, for different box covers 200, the center distances of the first bearing hole 201 and the second bearing hole 202 are different, the thicknesses, the fall of the upper end surface and the lower end surface and the shapes of the edges of the different bearing holes are different, and the clamping device in the prior art is poor in universality and brings inconvenience to production.

In order to solve the above problems, the present embodiment provides a clamping device for a wind turbine gearbox cover, which is mounted on a workbench 100, and as shown in fig. 1, the clamping device includes a first base 11 and a second base 12, a first clamping unit and a second clamping unit, a first pressing unit 31 and a second pressing unit 32, and an adjusting unit; specifically, the first base 11 and the second base 12 are slidably connected to the table 100, respectively, and can support the box cover 200; the first clamping unit and the second clamping unit are respectively arranged on the first base 11 and the second base 12 and are respectively used for positioning the first bearing hole 201 and the second bearing hole 202; the first pressing unit 31 and the second pressing unit 32 are slidably connected with the workbench 100 and are respectively used for pressing the upper end surface of the first bearing hole 201 and the upper end surface of the second bearing hole 202; the adjustment unit is provided on the table 100 and can abut on the bottom edge of the cover 200 to adjust the height of the cover 200.

The first base 11 and the second base 12 are used for supporting the box cover 200, so that the use of auxiliary tools is reduced, and the stability of the box cover 200 in the machining process is improved; the center distance between the first base 11 and the second base 12 is adjusted, so that the box cover 200 is suitable for box covers 200 with different center distances between the first bearing hole 201 and the second bearing hole 202, and the applicability is improved; the first clamping unit and the second clamping unit are used for radial positioning of the box cover 200 so as to ensure the radial positioning accuracy of the box cover 200; when the edge of the bottom surface of the case cover 200 is not flat and the first base 11 or the second base 12 cannot simultaneously and stably support the case cover 200, the adjusting unit performs auxiliary support and can perform fine adjustment on the height of the case cover 200, so as to ensure that the height difference of the whole processing plane is within a preset value and improve the axial positioning precision; the first pressing unit 31 and the second pressing unit 32 are used for clamping the box cover 200, and are suitable for different fall heights of the box cover 200, so that the processing precision is improved; the clamping device is simple and compact in structure, convenient to operate and strong in applicability, the clamping correction time is shortened, the production efficiency is improved, and the production cost is reduced.

Alternatively, as shown in fig. 2, the first clamping unit includes a self-centering three-jaw chuck assembly 21, the self-centering three-jaw chuck assembly 21 is used for tightening the first bearing hole 201 to quickly center the first bearing hole 201 therein, and the first bearing hole 201 with various apertures can be applied; the second clamping unit comprises a self-centering two-jaw chuck component 22, the self-centering two-jaw chuck component 22 is used for tightly supporting the second bearing hole 202 and can be suitable for the second bearing holes 202 with various apertures, so that the position of the box cover 200 is finely adjusted, the clamping correction time is shortened, and the production efficiency is improved. The self-centering three-jaw chuck assembly 21 and the self-centering two-jaw chuck assembly 22 are both of an inverted jaw structure, and the first bearing hole 201 and the second bearing hole 202 are quickly braced by utilizing the inverted jaws. Specifically, the self-centering three-jaw chuck assembly 21 includes a first chuck base 212 and three first jaws 211 mounted on the first chuck base 212 at regular intervals; the self-centering two jaw chuck assembly 22 includes a second chuck base 221 and two second jaws 222 symmetrically mounted on the second chuck base 221. In actual use, the first bearing hole 201 and the second bearing hole 202 of the box cover 200 are respectively sleeved on the jaws of the self-centering three-jaw chuck assembly 21 and the self-centering two-jaw chuck assembly 22.

Referring to fig. 2 and 3, optionally, the first base 11 includes a first body portion 111 and a plurality of first support ribs 112 disposed around a circumference of the first body portion 111, a top end of the first support rib 112 is higher than a top end of the first body portion 111, and a top surface of the first support rib 112 can abut against a lower end surface of the first bearing hole 201 of the lid 200 to support a weight of the lid 200, reduce the use of other auxiliary tools, and increase a stability of the lid 200 during a processing process; the part of the plurality of first support ribs 112 higher than the top end of the first body part 111 and the first body part 111 are enclosed to form a first containing groove, and the self-centering three-jaw chuck assembly 21 is arranged in the first containing groove, so that the structure is compact; it should be noted that the number of the first support ribs 112 may be set according to actual needs, and the embodiment is not particularly limited.

Similarly, the second base 12 includes a second body portion 121 and a plurality of second supporting ribs 122 disposed around the circumference of the second body portion 121, the top surface of the second supporting rib 122 can abut against the lower end surface of the second bearing hole 202 of the cover 200, and the plurality of second supporting ribs 122 and the second body portion 121 enclose a second accommodating groove for accommodating the self-centering two-jaw chuck assembly 22, which is not described herein again.

Optionally, the plurality of first supporting ribs 112 are uniformly spaced along the circumferential direction of the first body portion 111, so as to improve the installation stability of the self-centering three-jaw chuck assembly 21 and the supporting stability of the case cover 200; in this embodiment, three first support ribs 112 are included. Similarly, the second support ribs 122 are uniformly spaced along the circumferential direction of the second body portion 121, and are not described herein again.

Specifically, the self-centering two-jaw chuck assembly 22 is in transition fit with the second receiving groove, and the second body portion 121 is connected with the self-centering two-jaw chuck assembly 22 through a fastener; further, with reference to fig. 3, the second body portion 121 is provided with a mounting hole 124, and the second chuck base 222 is connected to the mounting hole 124 through a fastener, so as to detachably connect the second chuck base 222 and the first body portion 111, and further improve the connection stability of the two.

Optionally, a plurality of connection holes are formed in the second chuck base 222, the connection holes are uniformly distributed around the second body portion 121, the mounting holes 124 on the second body portion 121 and the connection holes on the second chuck base 222 are arranged in a one-to-one correspondence, and a plurality of fasteners respectively pass through the connection holes and the mounting holes 124 which are arranged in an opposite manner, so as to fix the second chuck base 222 on the second body portion 121.

Similarly, the self-centering three-jaw chuck assembly 21 is in transition fit with the first receiving groove, and the first body 111 is connected to the self-centering three-jaw chuck assembly 21 through a fastener, which is not described herein again.

Referring to fig. 1 and 2, optionally, a T-shaped groove 101 is formed in the workbench 100, and sliders are disposed at the bottoms of the first base 11 and the second base 12, and are slidably connected to the T-shaped groove 101, so as to adjust positions of the sliders, thereby improving applicability of the clamping device to different box covers 200.

In this embodiment, the first base 11 and the second base 12 are directly slidably connected to the worktable 100 for adjustment, and are suitable for a wider range of adjustment center distances, thereby improving applicability. Specifically, referring to fig. 4, a first base slider structure 113 is disposed on the first base 11, a second base slider structure 125 is disposed on the second base 12, a T-shaped groove 101 is formed in the workbench 100, and the first base slider structure 113 and the second base slider structure 125 are respectively slidably connected in the T-shaped groove 101, so that the first base 11 and the second base 12 are respectively slidably connected on the workbench 100, the distance between the first base 11 and the second base 12 is conveniently adjusted, and the applicability to different box covers 200 is increased.

The jacks 41 are stably adjusted and are convenient to use, optionally, the adjusting unit comprises a plurality of jacks 41, ejector rods of the jacks 41 can abut against the edge of the bottom surface of the box cover 200 to perform auxiliary support, and the height of the box cover 200 can be finely adjusted to ensure that the height drop of the whole processing plane is within a preset value; optionally, the parallelism tolerance between the bottom surface of the box cover 200 and the workbench 100 is less than 0.1mm, that is, the preset value is 0.1mm, so as to improve the processing precision; the bottom end of the jack 41 is connected to the workbench 100, and the installation position of the jack 41 is adjusted according to the shapes of different box covers 200; and the plurality of jacks 41 can adapt to the fall at different positions of the bottom end of the box cover 200.

With continued reference to fig. 1 to 3, in this embodiment, through holes are respectively formed in the first base 11, the second base 12, the first clamping unit, and the second clamping unit, the first pressing unit 31 includes a first screw 311 penetrating through the through holes, a first pressing plate 312 for pressing the upper end surface of the first bearing hole 201 of the box cover 200 is installed at one end of the first screw 311, a slider is installed at the other end of the first screw 311, the slider is slidably connected with the T-shaped groove 101, so that the position of the first pressing unit 31 for pressing the top end of the first bearing hole 201 is changed along with the change of the center distance, and the first pressing plate 312 is installed on the first screw 311, so that the height of the first pressing plate 312 is adjusted, and the first pressing plate is suitable for the height of the upper end surface; specifically, the first screw 311 and the first pressing plate 312 are connected through a hexagonal flange nut, and the first pressing plate 312 presses the case cover 200 by screwing the hexagonal flange nut, so that the case cover 200 is pressed, the fixing effect is improved, and the processing stability is ensured; the first screw 311 is connected in a T-shaped groove of the table 100 by a T-shaped slider so as to adjust the position of the first pressing unit 31 on the table 100.

Similarly, the second pressing unit 32 includes a second screw 321 penetrating through the through hole, a second pressing plate 322 for pressing the upper end surface of the second bearing hole 202 of the box cover 200 is installed at one end of the second screw 321, a sliding block is arranged at the other end of the second screw 321, and the sliding block is slidably connected with the T-shaped groove 101, which is not described herein again; specifically, the second screw 321 and the second pressure plate 322 are connected by a hexagonal flange nut; in this embodiment, as shown in fig. 3, a base through hole 123 is formed on a central line of the second base, a chuck through hole communicated with the base through hole 123 is formed on the second chuck base 222, and when the apparatus is installed, the second screw 321 sequentially passes through the base through hole 123, the chuck through hole and the second bearing hole 202 and then is connected with the second pressure plate 322, and the second pressure plate 322 is pressed on the upper end surface according to the height of the upper end surface of the second bearing hole 202; the first pressing unit 31 and the second pressing unit 32 are adjustable at the same time to adjust the fall of the box cover 200 at the end surfaces of the first bearing hole 201 and the second bearing hole 202, so that the applicability of the clamping device to the box cover 200 is improved.

Further optionally, when the clamping device is used for clamping the box cover 200 of the wind power gearbox, the clamping device comprises the following steps:

s1: adjusting the positions of the first base 11 and the second base 12 on the worktable 100 according to the center distance between the first bearing hole 201 and the second bearing hole 202;

s2: adjusting the heights of the first pressing unit 31 and the second pressing unit 32 according to the heights of the upper end surfaces of the first bearing hole 201 and the second bearing hole 202;

s3: the self-centering three-jaw chuck assembly 21 and the self-centering two-jaw chuck assembly 22 are respectively used for radial positioning of a first bearing hole 201 and a second bearing hole 202 of the box cover 200;

s4: the adjusting unit is used for axially positioning the case cover 200, assisting in supporting the case cover 200 and adjusting the height difference of the processing plane of the case cover 200 to be within 0.1 mm;

s5: the first and second pressing plates 312 and 322 press the upper end surfaces of the first and second bearing holes 201 and 202, respectively.

And then the subsequent processing procedure can be carried out.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.