阅读说明：本技术 丝杆拉伸支撑结构及其安装方法 (Screw rod stretching support structure and mounting method thereof ) 是由 谭勇 苏辉南 于 2021-07-22 设计创作，主要内容包括：本发明提供了一种丝杆拉伸支撑结构及其安装方法,包括电机端支撑组和尾座端支撑组；丝杆的一端转动安装在电机端支撑组内,丝杆的另一端转动安装在尾座端支撑组内；尾座端支撑组包括轴承座,杆的另一端探入轴承座内,丝杆与轴承座之间连接有第二角接触球轴承,轴承座靠近电机端支撑组的一侧紧固连接有第二轴承压盖,第二轴承压盖与轴承座之间设置有拉伸调整垫。通过先将丝杆的一端安装到电机端支撑组上,之后再将丝杆的另一端安装到轴承座上,第二轴承压盖向轴承座的尾端不断压紧,丝杆向轴承座的尾端不断拉伸；当丝杆拉伸达到理论拉伸量时,然后安装合适大小的拉伸调整垫,有助于提高对丝杆安装和工作的稳定性,且能够适应精度较高的机床。(The invention provides a screw rod stretching support structure and an installation method thereof, wherein the screw rod stretching support structure comprises a motor end support group and a tailstock end support group; one end of the screw rod is rotatably arranged in the motor end supporting group, and the other end of the screw rod is rotatably arranged in the tailstock end supporting group; the tailstock end support group comprises a bearing seat, the other end of the rod extends into the bearing seat, a second angular contact ball bearing is connected between the screw rod and the bearing seat, a second bearing cover is tightly connected to one side, close to the motor end support group, of the bearing seat, and a stretching adjusting pad is arranged between the second bearing cover and the bearing seat. One end of a screw rod is installed on a motor end supporting group, the other end of the screw rod is installed on a bearing seat, a second bearing cover is continuously pressed towards the tail end of the bearing seat, and the screw rod is continuously stretched towards the tail end of the bearing seat; when the lead screw is stretched to reach the theoretical stretching amount, the stretching adjusting pad with the proper size is installed, the stability of installation and work of the lead screw is improved, and the machine tool with high precision can be adapted.)

1. A screw rod stretching support structure is characterized by comprising a motor end support group (1) and a tailstock end support group (2); one end of the screw rod (3) is rotatably arranged in the motor end supporting group (1), and the other end of the screw rod (3) is rotatably arranged in the tail seat end supporting group (2);

the tailstock end support group (2) comprises a bearing seat (17), the other end of the screw rod (3) is inserted into the bearing seat (17), a second angular contact ball bearing (19) is connected between the screw rod (3) and the bearing seat (17), a second bearing cover (15) is fixedly connected to one side, close to the motor end support group (1), of the bearing seat (17), and a stretching adjusting pad (16) is arranged between the second bearing cover (15) and the bearing seat (17).

2. The lead screw stretching support structure as claimed in claim 1, wherein the motor end support set (1) comprises a motor base (5), one end of the lead screw (3) extends into the motor base (5), a first angular contact ball bearing (11) is connected between the lead screw (3) and the motor base (5), a driving motor (4) is arranged on the motor base (5), and an output shaft of the driving motor (4) is connected with the lead screw (3) through a coupling.

3. The lead screw tensile support structure of claim 2, wherein a side of the motor base (5) adjacent to the bearing seat (17) is formed with a mounting groove (51), the mounting groove (51) having a diameter allowing the lead screw (3) to pass through, and an opening of the mounting groove (51) adjacent to the bearing seat (17) having a diameter not allowing the first angular contact ball bearing (11) to pass through;

be provided with first bearing gland (10) in motor cabinet (5), first bearing gland (10) support tight fit with the outer loop terminal surface of the opposite side of first angular contact ball bearing (11), lead screw (3) pass first bearing gland (10), just lead screw (3) and first bearing gland (10) normal running fit.

4. The lead screw stretching support structure according to claim 3, characterized in that the inner ring end surface of one side of the first angular contact ball bearing (11) close to the bearing seat (17) is in abutting fit with the shaft shoulder of the lead screw (3), the lead screw (3) is in threaded fit with a first locking nut (7), and the first locking nut (7) is in abutting fit with the inner ring end surface of the other side of the first angular contact ball bearing (11).

5. The lead screw tensile support structure of claim 3, wherein the first skeleton oil seal (9) is embedded on both the outer wall of the mounting groove (51) and the first bearing cover (10).

6. The screw tensioning support structure according to claim 1, characterized in that the second angular contact ball bearings (19) are provided in sets within a bearing seat (17), and a second spacer (18) is provided between any two adjacent second angular contact ball bearings (19).

7. The screw tensioning support structure according to claim 1, characterized in that a third bearing cap (20) is arranged on the side of the bearing seat (17) remote from the second bearing cap (15), the third bearing cap (20) is in abutting fit with the outer annular end face of the second angular contact ball bearing (19), and the screw (3) passes through the third bearing cap (20) and is in rotational fit therewith.

8. The screw rod stretching support structure as recited in claim 7, characterized in that a third spacer (22) is sleeved on the screw rod (3), the third spacer (22) penetrates through the third bearing cover (20) and is in running fit with the third bearing cover, a second locking nut (23) is further in threaded fit with the screw rod (3), and the second locking nut (23) abuts against the third spacer (22) and presses the third spacer against an inner ring end face of the second angular contact ball bearing (19) which is away from the second bearing cover (15).

9. The screw tensioning support structure according to claim 1, characterized in that the second and third bearing caps (15, 20) each have a second skeleton oil seal (14) embedded thereon.

10. A method of mounting a screw (3) tensile support structure according to claim 1, comprising the screw (3) tensile support structure according to claims 1-9, the mounting steps being as follows:

s1, rotationally mounting one end of the screw rod (3) into a motor base (5) through a first angular contact ball bearing (11);

s2, rotatably mounting the other end of the screw rod (3) into a bearing seat (17) through the second angular contact bearing;

s3, mounting a second bearing cover (15) on one side, close to the motor base (5), of the bearing seat (17), then mounting a stretching adjusting pad (16) with a proper size according to the gap between the second bearing cover (15) and the motor base (5), and finishing stretching of the screw rod (3);

and S4, mounting a third bearing cover (20).

Technical Field

The invention relates to the technical field of machining and manufacturing, in particular to a screw rod stretching and supporting structure and an installation method thereof.

Background

The ball screw is one of the most important parts in a machine tool transmission mechanism, the screw can continuously rotate in the working process of the machine tool so as to provide axial force for the movement of the machine tool, and in the working process, the screw can generate a large amount of heat, and the lead of the screw can be increased due to thermal expansion of the screw, so that the precision of the machine tool is influenced.

In order to compensate thermal expansion, the screw rod must be pre-stretched, the pre-stretched screw rod can enhance rigidity, the later deformation of the ball screw rod is reduced, and the screw rod can keep a higher dynamic and static performance level, so that the aims of improving the working precision of a machine tool and prolonging the service life are fulfilled.

The prior chinese patent with publication number CN212683271U discloses a pre-stretching structure for a lead screw, which comprises a first pre-stretching hole, a spring, an adjusting nut, a lead screw, a bearing set, a base and a second pre-stretching hole, and is characterized in that: the automatic pre-stretching device is characterized by further comprising a movable gland and a sliding groove, a first pre-stretching hole and a second pre-stretching hole are formed in the base, the sliding groove is formed in the two side walls of the base, the movable gland is fixed in the sliding groove and fixed with the base through a first threaded hole and a second threaded hole in the base through bolts, the outer end face of the bearing group is limited and fixed through the movable gland connected with the base through bolts, the adjusting nut is connected with the lead screw through threads, two pre-stretching holes are formed in the adjusting nut and the bearing group through springs, and the pre-stretching of the lead screws with different diameters can be achieved through the cooperation of the movable cover.

The inventor considers that the prestretching structure in the prior art has poor stability, is difficult to adapt to the installation of a screw rod on a machine tool with higher precision requirements, and has a place to be improved.

Disclosure of Invention

In view of the defects in the prior art, the invention aims to provide a screw rod stretching support structure.

The invention provides a screw rod stretching support structure which comprises a motor end support group and a tailstock end support group, wherein the motor end support group is connected with a motor through a screw rod; one end of the screw rod is rotatably arranged in the motor end supporting group, and the other end of the screw rod is rotatably arranged in the tailstock end supporting group; the tailstock end support group comprises a bearing seat, the other end of the screw rod extends into the bearing seat, a second angular contact ball bearing is connected between the screw rod and the bearing seat, a second bearing gland is fixedly connected to one side, close to the motor end support group, of the bearing seat, and a stretching adjusting pad is arranged between the second bearing gland and the bearing seat.

Preferably, the motor end supporting group comprises a motor base, one end of the screw rod extends into the motor base, a first angular contact ball bearing is connected between the screw rod and the motor base, a driving motor is arranged on the motor base, and an output shaft of the driving motor is connected with the screw rod through a coupler.

Preferably, a mounting groove is formed on one side of the motor base close to the bearing seat, the diameter of the mounting groove allows the screw rod to pass through, and the diameter of an opening of the mounting groove close to one side of the bearing seat does not allow the first angular contact ball bearing to pass through; the motor base is internally provided with a first bearing cover, the first bearing cover is in abutting fit with the outer ring end face of the other side of the first angular contact ball bearing, the screw rod penetrates through the first bearing cover, and the screw rod is in running fit with the first bearing cover.

Preferably, the inner ring end surface of one side of the first angular contact ball bearing, which is close to the bearing seat, abuts against and is tightly matched with the shaft shoulder of the screw rod, the screw rod is in threaded fit with a first locking nut, and the first locking nut abuts against and is tightly matched with the inner ring end surface of the other side of the first angular contact ball bearing.

Preferably, the outer wall of the mounting groove and the first bearing gland are both embedded with a first framework oil seal.

Preferably, a plurality of groups of the second angular contact ball bearings are arranged in the bearing seat, and a second spacer is arranged between any two adjacent second angular contact ball bearings.

Preferably, one side of the bearing seat, which is far away from the second bearing cover, is provided with a third bearing cover, the third bearing cover is in abutting fit with the outer ring end face of the second angular contact ball bearing, and the screw rod penetrates through the third bearing cover and is in running fit with the third bearing cover.

Preferably, a third spacer bush is sleeved on the screw rod, the third spacer bush penetrates through the third bearing cover and is in running fit with the third bearing cover, a second locking nut is further in threaded fit with the screw rod, and the second locking nut abuts against the third spacer bush and tightly presses the third spacer bush on the end face of the inner ring of the second angular contact ball bearing, which faces away from the second bearing cover.

Preferably, a second framework oil seal is embedded on the second bearing cover and the third bearing cover.

According to the invention, the installation method of the screw rod stretching support structure comprises the screw rod stretching support structure of claims 1-9, and the installation steps are as follows: s1, rotationally mounting one end of the screw rod into a motor base through a first angular contact ball bearing; s2, rotatably mounting the other end of the screw rod into a bearing seat through the second angular contact bearing; s3, mounting a second bearing cover on one side, close to the motor base, of the bearing block, and then mounting a stretching adjusting pad with a proper size according to the gap between the second bearing cover and the motor base, so that the stretching of the screw rod is finished; and S4, mounting a third bearing cover.

Compared with the prior art, the invention has the following beneficial effects:

1. the two ends of the screw rod are respectively supported by the motor end supporting group and the tailstock end supporting group, one end of the screw rod is rotatably installed on the motor end supporting group, the other end of the screw rod is installed on the bearing seat, the screw rod is continuously pressed towards the tail end of the bearing seat through the second bearing cover, and the screw rod is continuously stretched towards the tail end of the bearing seat; when the stretching of the screw rod reaches the theoretical stretching amount, a stretching adjusting pad with a proper size is installed, so that the stretching support of the screw rod is realized, the stability of the installation and the work of the screw rod is improved, and the screw rod stretching adjusting pad can adapt to a machine tool with higher precision;

2. the two first angular contact ball bearings and the two second angular contact ball bearings which are arranged face to face are adopted, so that the axial positioning capacity of the screw rod is improved;

3. according to the invention, the second spacer bush arranged between the two second angular contact ball bearings is beneficial to improving the positioning capacity of the screw rod on one hand, and the axial action point distance of the two groups of second angular contact ball bearings is lengthened on the other hand, so that the support rigidity of the screw rod is increased.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic view of the overall structure of a support structure embodying the present invention;

FIG. 2 is a schematic view of the overall structure of a motor end support assembly embodying the present invention;

fig. 3 is a schematic view of the overall structure of the tailstock end support set according to the present invention.

Shown in the figure:

first angular contact ball bearing 11 of motor end support set 1

Second framework oil seal 14 of tailstock end support group 2

Screw 3 second bearing gland 15

Drive motor 4 stretches adjusting pad 16

Bearing seat 17 of motor base 5

Mounting groove 51 second spacer 18

Second angular contact ball bearing 19 of plum coupling 6

First locknut 7 third bearing cap 20

First spacer 8 and third spacer 22

First framework oil seal 9 and second locking nut 23

First bearing cap 10

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

As shown in fig. 1, the lead screw stretching support structure provided by the present invention includes a motor end support group 1 and a tailstock end support group 2, wherein one end of a lead screw 3 is rotatably installed in the motor end support group 1, and the other end of the lead screw 3 is rotatably installed in the tailstock end support group 2.

As shown in fig. 1 and 2, the motor end support group 1 includes a motor base 5, the motor base 5 is an installation base of the motor end support group 1, a mounting groove 51 for mounting a bearing is formed inside the motor base 5 close to the tailstock end support group 2, two sets of first angular contact ball bearings 11 are coaxially embedded in the mounting groove 51, the two first angular contact ball bearings 11 are of a double-row structure, and the two first angular contact ball bearings 11 are installed in a face-to-face manner.

The diameter of the opening of the mounting groove 51 close to one side of the tailstock end support group 2 does not allow the first angular contact ball bearing 11 to pass through, the opening of the mounting groove 51 far away from one side of the tailstock end support group 2 is provided with the first bearing cap 10, the first bearing cap 10 is tightly matched with the outer ring end face of the first angular contact ball bearing 11 close to the first bearing cap, and the screw rod 3 penetrates through the first bearing cap 10 and is in running fit with the first bearing cap. The two first angular contact ball bearings 11 are clamped in the mounting groove 51 by means of the cooperation of the inner wall of the mounting groove 51 close to the tailstock end support group 2 and the first bearing cap 10, and the outer rings of the two first angular contact ball bearings 11 are tightly connected with the inner wall of the mounting groove 51.

One end of the screw rod 3 coaxially penetrates into the inner rings of the two first angular contact ball bearings 11 from the opening at one side of the installation groove 51 close to the tailstock end support group 2. The inner ring end face of one side of the first angular contact ball bearing 11 close to the tailstock end support group 2 is abutted with the shaft shoulder of the lead screw 3 through the first spacer 8, the lead screw 3 penetrates through the mounting groove 51 and is in threaded fit with the first locking nut 7, and the inner ring end face of one side of the first angular contact ball bearing 11 far away from the tailstock end support group 2 is abutted with the first spacer 8 through the first locking nut 7. By means of the abutting fit of the shaft shoulder of the screw rod 3 and the inner ring end face of one side, close to the tailstock end support group 2, of the first angular contact ball bearing 11, and the abutting fit of the inner ring end face of one side, far away from the tailstock end support group 2, of the first locking nut 7 and the first angular contact ball bearing 11, the screw rod 3 and the inner rings of the two first angular contact ball bearings 11 are fastened and connected.

The mounting groove 51 is close to the outer wall that tailstock end supported group 2, all inlays on the outer wall of one side that first bearing cap 10 deviates from mounting groove 51 and establishes and install first skeleton oil blanket 9, is sealed respectively by two first skeleton oil blankets 9 to the both sides opening of mounting groove 51, has guaranteed the stability and the reliability of two first angle contact ball bearing 11 motions in the mounting groove 51.

One side of the motor base 5, which is far away from the tailstock end support group 2, is fixedly provided with the driving motor 4 through a bolt, the screw rod 3 penetrates out of one side of the opening of the mounting groove 51, which is far away from the tailstock end support group 2, and is coaxially and fixedly connected with the output of the driving motor 4 through the plum coupling 6, so that a linear connection mode of the screw rod 3 and the output shaft of the driving motor 4 is realized, and the motion stability of the screw rod 3 is improved.

As shown in fig. 1 and fig. 3, the tailstock end support group 2 includes a bearing seat 17, the other end of the screw rod 3 penetrates into the bearing seat 17, a second angular contact ball bearing 19 is connected between the screw rod 3 and the bearing seat 17, and the second angular contact ball bearing 19 is of a double-row structure. Two groups of second angular contact ball bearings 19 are coaxially arranged in the bearing seat 17, two second angular contact ball bearings 19 are arranged in a face-to-face mode, and a second spacer 18 is arranged between the two second angular contact ball bearings 19 and used for separating the two second angular contact ball bearings 19. The mode not only improves the positioning capacity of the screw rod 3, but also lengthens the axial action point distance of the two groups of second angular contact ball bearings 19 and increases the supporting rigidity of the screw rod 3.

A second bearing cover 15 is fixedly mounted on one side, close to the motor base 5, of the bearing seat 17, a third bearing cover 20 is fixedly mounted on the other side of the bearing seat 17 through bolts, the third bearing cover 20 is in abutting fit with the outer ring end face of a second angular contact ball bearing 19 far away from the motor base 5, and the lead screw 3 sequentially penetrates through the second bearing cover 15 and the third bearing cover 20 and is respectively in running fit with the second bearing cover and the third bearing cover.

The second bearing cap 15 is locked and fixed with the bearing seat 17, the second bearing cap 15 is tightly matched with the outer ring end face of the second angular contact ball bearing 19 in a propping manner, the inner ring end face of one side of the second angular contact ball bearing 19, which is close to the motor base 5, is tightly matched with the shaft shoulder of the screw rod 3 in a propping manner, and a stretching adjusting pad 16 is arranged between the second bearing cap 15 and the bearing seat 17. The second bearing cap 15 is connected to the bearing seat 17, and the second bearing cap 15 is continuously pressed towards the tail end of the bearing seat 17, and at the moment, because one end of the screw rod 3 is fixed on the motor base 5, the screw rod 3 is continuously stretched towards the tail end of the bearing seat 17. When the stretching of the screw rod 3 reaches the theoretical stretching amount, measuring the actual gap between the second bearing cover 15 and the bearing seat 17, taking the measured gap as the thickness of the quasi-match grinding stretching adjusting pad 16 to reach the value, and then installing the stretching adjusting pad 16 until the stretching of the screw rod 3 is finished.

The third spacer 22 is coaxially sleeved on the screw rod 3, the third spacer 22 penetrates through the third bearing pressure cover 20 and is in running fit with the third bearing pressure cover, a second locking nut 23 is in threaded fit with one end, far away from the motor base 5, of the screw rod 3, and the second locking nut 23 abuts against the third spacer 22 and tightly presses the third spacer 22 against the end face, far away from the motor base 5, of the inner ring of the second angular contact ball bearing 19.

The second bearing cap 15 and the third bearing cap 20 are both fitted and clamped on the end faces of the outer rings on both sides of the second angular contact ball bearings 19 installed in the bearing housing 17, so that the outer rings of both the second angular contact ball bearings 19 are fastened and connected with the bearing housing 17. The inner rings of the two second angular contact ball bearings 19 are tightly connected with the screw rod 3 by means of the matching of the shaft shoulder of the screw rod 3 and the third spacer 22, so that the screw rod 3 is in running fit with the bearing seat 17, the second framework oil seals 14 are embedded and installed on the outer walls of the second bearing cover 15 and the third bearing cover 20 which deviate from each other, the openings at the two sides of the bearing seat 17 are respectively sealed by the two second framework oil seals 14, and the stability and the reliability of the movement of the two second angular contact ball bearings 19 installed in the bearing seat 17 are ensured.

The mounting method of the screw rod stretching and supporting structure provided by the invention comprises the following steps of:

s1, one end of the screw rod 3 is rotatably installed in the motor base 5 through the two first angular contact ball bearings 11, and the screw rod 3 is coaxially and fixedly connected with an output shaft of the driving motor 4 through the plum coupling 6.

S2, rotatably mounting the other end of the screw rod 3 into the bearing seat 17 through a second angular contact bearing;

s3, mounting a second bearing cover 15 on one side, close to the motor base 5, of the bearing block 17, then mounting a stretching adjusting pad 16 with a proper size according to the gap between the second bearing cover 15 and the motor base 5, and finishing stretching of the screw rod 3;

and S4, mounting the third bearing cover 20, and abutting the third spacer 22 against the end surface of the inner ring of the second angular contact ball bearing 19 through the second lock nut 23.

Principle of operation

In the working process, one end of the screw rod 3 is rotatably installed in the installation groove 51 seat through two first angular contact ball bearings 11, and the screw rod 3 is coaxially and fixedly connected with an output shaft of the driving motor 4 through a plum coupling 6; the other end of the screw rod 3 is mounted in a bearing seat 17 through two second angular contact ball bearings 19, a second bearing cover 15 is mounted on one side, close to the motor base 5, of the bearing seat 17, a tensile adjusting pad 16 with a proper size is mounted according to a gap between the second bearing cover 15 and the motor base 5, a third bearing cover 20 is mounted, and a third spacer 22 is abutted against the end face of an inner ring of the second angular contact ball bearings 19 through a second locking nut 23.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.