CN217252870U

CN217252870U - Abrasion-proof tailstock

Info

Publication number: CN217252870U
Application number: CN202221243342.2U
Authority: CN
Inventors: 崔永坚; 李海
Original assignee: Dujiangyan Ningjiang Zonghui Precision Small Sized Worm Co ltd
Current assignee: Dujiangyan Ningjiang Zonghui Precision Small Sized Worm Co ltd
Priority date: 2022-05-23
Filing date: 2022-05-23
Publication date: 2022-08-23
Anticipated expiration: 2032-05-23

Abstract

The utility model discloses an anti-abrasion tailstock, belonging to the technical field of machining, which comprises a centre seat, a centre and a rotation-facilitating assembly; the center is in clearance fit with the shaft hole of the center seat, a bearing is assembled between the center and the center seat, and a bearing shaft shoulder is also arranged on the center; the rotation facilitating assembly is arranged between the shaft shoulder and the top tip seat and is provided with a first bearing plate and a second bearing plate which can rotate relatively, the top tip is sleeved with the first bearing plate and the second bearing plate, the first bearing plate is connected or contacted with the shaft shoulder, and the second bearing plate is connected or contacted with the top tip seat. The utility model discloses can reduce under the operating condition top and the tip seat wear each other, can guarantee top structural accuracy and thus guarantee the machining precision of part.

Description

Anti-abrasion tailstock

Technical Field

The utility model relates to a machinery processing technology field particularly, relates to an abrasionproof decreases tailstock.

Background

At present, most of tail tips of a gear milling machine tool adopt a sliding structure, the tips and a tip seat slide and rotate, and the tips need to bear radial and axial milling forces in the process of milling a worm by the machine tool. The sliding structure has the advantages that if the axial force is too small, the workpiece cannot be tightly pushed; if the axial force is too large, the contact force between the center and the center seat is increased, so that the center cannot flexibly rotate along with a workpiece, the abrasion between the center and the center seat is increased, the gap between the center and the center seat is increased, and the precision of a machined part is greatly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that how to reduce the wearing and tearing of top and apex seat, aim at provides an abrasionproof decreases tailstock.

The utility model discloses a following technical scheme realizes:

a wear resistant tailstock comprising:

a tip seat;

the center is in clearance fit with the shaft hole of the center seat, a bearing is assembled between the center and the center seat, and a bearing shaft shoulder is further arranged on the center;

the rotation facilitating assembly is arranged between the shaft shoulder and the top tip seat and is provided with a first bearing plate and a second bearing plate which can rotate relatively, the top tip is sleeved with the first bearing plate and the second bearing plate, the first bearing plate is connected or contacted with the shaft shoulder, and the second bearing plate is connected or contacted with the top tip seat.

In some embodiments, the first bearing plate is provided with an annular first limiting groove which is coaxial with the tip;

the second bearing plate is provided with an annular second limiting groove which is coaxial with the tip, and a space is reserved between the second bearing plate and the first bearing plate;

the rolling mechanism further comprises a rolling body which is positioned in the first limiting groove and the second limiting groove at the same time, and the rolling body has the rotational freedom degree in any direction.

In some embodiments, the thrust assembly is an end bearing.

In some embodiments, the shoulder is provided with an annular strain-resistant groove coaxial with the tip; the inner side groove edge of the strain-resistant groove is positioned on the tip shaft section, and the outer side groove edge of the strain-resistant groove is positioned on the shaft shoulder.

In some embodiments, the first bearing plate and the second bearing plate are matched in a plate-surface contact manner, and the friction coefficient of the first bearing plate and/or the second bearing plate is less than min { a, b }, wherein a is the friction coefficient of the shaft shoulder, and b is the friction coefficient of the tip seat.

In some embodiments, the first bearing plate and the second bearing plate are both teflon plates.

In some embodiments, the number of bearings is at least two.

In some embodiments, a spacer is disposed between adjacent bearings.

In some embodiments, the bearing is a needle bearing.

In some embodiments, the tool comprises a front end cover and a rear end cover, the front end cover is sleeved on the center and connected with the center seat to form a closed movable cavity, and the force bearing shaft shoulder is positioned in the movable cavity;

the rear end cover is fixedly connected with the center in a coaxial mode and is in clearance fit connection with the center seat shaft hole.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

the utility model provides a pair of abrasionproof decreases tailstock, it is spacing to lead to changeing the subassembly and can be to top formation axial, and top and the bearing between the apex seat can be radial spacing to top formation to prevent to produce great contact force after top and apex seat contact or the contact, and top and the profit also can not take place relative wearing and tearing between subassembly, the bearing, thereby can guarantee top size precision, thereby guarantee the machining precision of part.

Drawings

In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic structural view of an anti-abrasion tailstock provided in an embodiment of the present invention;

fig. 2 is a schematic structural view of a tip provided in an embodiment of the present invention;

fig. 3 is a schematic structural view of a center seat according to an embodiment of the present invention;

fig. 4 is a schematic view of an end face structure of the center seat according to an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

1-a tip seat, 11-a force bearing shaft shoulder, 12-a conical surface end, 13-a plane end, 14-a strain resisting groove, 2-a tip seat, 3-a bearing, 4-a spacer bush, 5-a front end cover and 6-a rear end cover.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more clearly understood, the following description is given for further details of the present invention with reference to the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention, and are not intended to limit the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those of ordinary skill in the art that: it is not necessary to employ these specific details to practice the invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.

Throughout the specification, reference to "one embodiment," "an embodiment," "one example" or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the present invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present invention.

Examples

In an embodiment of the utility model, the anti-abrasion tailstock comprises a centre seat 1, a centre and a rotation-facilitating component; the center is in clearance fit with a shaft hole of the center seat 1, a bearing 3 is assembled between the center and the center seat 1, and a bearing shaft shoulder 11 is also arranged on the center; the rotation facilitating assembly is arranged between the shaft shoulder and the top seat 1 and is provided with a first bearing plate and a second bearing plate which can rotate relatively, the top is sleeved with the first bearing plate and the second bearing plate, the first bearing plate is connected or contacted with the shaft shoulder, and the second bearing plate is connected or contacted with the top seat 1.

Specifically, the center is roughly cylindrical, the front end of the center is a conical surface end 12 used for supporting a part to be processed, the tail end of the center is a plane end 13, and a bearing shaft shoulder 11 is arranged on a shaft section, close to the conical surface end 12, on the center; the center seat 1 is provided with a mounting hole, the tail end of the center is inserted into the mounting hole and is in clearance fit with the mounting hole, the mounting hole can be a blind hole or a through hole, when the mounting hole is a blind hole, a clearance is formed between the tail end of the center and the hole bottom of the mounting hole, the conical surface end 12 of the center is positioned outside the center seat 1, and a circular accommodating groove is formed in the end part, close to the conical surface end 12, of the center seat 1; first bearing plate and second bearing plate are circular, and first bearing plate and the equal coaxial cover of second bearing plate are established apical, and first bearing plate and second bearing plate still coaxial set up in the holding tank and the diameter of first bearing plate, second bearing plate all is less than the latus rectum of holding tank in order to guarantee that first bearing plate and second bearing plate can freely rotate in the holding tank, the normal running fit between first bearing plate and the second bearing plate.

When the lathe tool works, the tailstock enables the centre to support a part in a propping mode through position adjustment, and because the bearing 3 is arranged between the shaft section, close to the tail end, of the centre and the centre seat 1 in the radial direction, the centre can be limited in the radial direction and can rotate freely around the axis of the centre seat 1; in the axial direction, the arrangement of the rotation facilitating assembly and the bearing shoulder 11 can form axial limit on the tip, so that the axial displacement of the tip is smaller when the tip bears larger axial force, the first bearing plate and the second bearing plate form a rotating pair through rotating fit, and relative to the friction pair formed by the contact of the bearing shoulder 11 and the first bearing plate or the friction pair formed by the tip seat 1 and the second bearing plate, under the condition of larger axial force, larger friction force is generated among the bearing shoulder 11, the tip seat 1 and the rotation facilitating assembly, the first bearing plate and the second bearing plate can be driven by a part to rotate relatively, so that the bearing shoulder 11, the tip seat 1 and the rotation facilitating assembly cannot be worn relatively, the tip can freely rotate along with the part in a working state, the temperature rise of the tip and the part top holding position is avoided, and the tip cannot be contacted with the tip seat 1 under the limit of the rotation facilitating assembly and the bearing 3, therefore, the center and the center seat 1 cannot be abraded relatively in the machining process, and the machining precision of parts is further guaranteed.

In the embodiment of the present application, the rotational fitting of the first bearing plate and the second bearing plate refers to a fitting relationship that the first bearing plate and the second bearing plate can rotate as described above, and it may be a contact fitting, or a fitting performed through an intermediate member, and the final purpose of the rotational fitting is to make the resistance of the first bearing plate and the second bearing plate during the relative rotation smaller than the friction force between the center, the center seat 1 and the rotation facilitating assembly, which may be a value that reduces the friction force, or a type that changes the friction force, and two specific fitting embodiments are provided below.

In a first optional embodiment, the first bearing plate is provided with an annular first limiting groove which is coaxial with the tip; the second bearing plate is provided with an annular second limiting groove which is coaxial with the tip, and a space is reserved between the second bearing plate and the first bearing plate; the rolling body is positioned in the first limiting groove and the second limiting groove and has the rotational freedom degree in any direction.

In this embodiment, the rolling element serves as an intermediate member to enable the first bearing plate and the second bearing plate to form a rotating fit, and rolling friction is formed between the rolling element and the first bearing plate and between the rolling element and the second bearing plate, so that under the condition that the tip bears a large axial force, the first bearing plate and the second bearing plate firstly rotate relatively before relative rotation occurs between the bearing shoulder 11 and the tip seat 1 and the rotation facilitating assembly, and then relative abrasion between the tip and the tip seat 1 and the rotation facilitating assembly is avoided.

It should be noted that, under the condition that the rolling body does not have the rotational degree of freedom in any direction, the relative rotation of the first bearing plate and the second bearing plate can also be realized; the thrust bearing is arranged in the housing of the power tool.

In a second optional embodiment, the friction coefficient of the first bearing plate and/or the second bearing plate is set to be less than min { a, b }, wherein a is the friction coefficient of the shaft shoulder, and b is the friction coefficient of the tip seat 1.

The first bearing plate and the second bearing plate are plates with smooth surfaces, and can be made of materials with small friction coefficients or coated with a layer of smooth materials. For example, in some alternative embodiments, the first and second force-bearing plates are both provided as teflon plates.

In some alternative embodiments, the shoulder is provided with an annular anti-strain groove 14 coaxial with the tip; the inner slot edge of the strain-resistant groove 14 is located on the tip shaft section and the outer slot edge is located on the shaft shoulder. After the part is clamped, the axial force borne by the center is high, the stress moment of the joint of the bearing shaft shoulder 11 and the shaft section of the center is large, and when the joint is arranged to be in a groove shape, the surface of the bearing shaft shoulder 11 and the surface of the shaft section of the center can be continuous, so that the anti-strain capacity of the joint is improved; and the groove-shaped structure can avoid forming assembly interference on the first bearing plate, and ensure that the plate surface of the first bearing plate is better attached to the end surface of the bearing shaft shoulder 11.

In some alternative embodiments, there are at least two bearings 3 between the shaft section of the tip near the tail end and the tip seat 1. So set up, can make top obtain better radial positioning, prevent top eccentric rotation.

In some alternative embodiments, spacers 4 are provided between adjacent bearings 3, and in the axial direction of the tip, the forwardmost bearing 3 abuts the turning assembly and the rearwardmost bearing 3 abuts the tip seat 1 or other structure. By the arrangement, the bearing 3 can be prevented from moving, and the mutual interference of the adjacent bearings 3 is avoided; and the spacer 4 is matched with the rotation facilitating assembly, the center seat 1 or other structures, so that the processing of a positioning shaft shoulder on the center can be avoided.

In some alternative embodiments, the bearing 3 is a needle bearing 3.

In some optional embodiments, the device comprises a front end cover 5 and a rear end cover 6, wherein the front end cover 5 is sleeved on the center and fixedly connected with the center seat 1 through bolts to form a closed movable cavity, the front end cover 5 and the center are in rotary sealing, and a force bearing shaft shoulder 11 is positioned in the movable cavity; the rear end cover 6 is fixedly connected with the center in a coaxial mode and is in clearance fit connection with the shaft hole of the center seat 1. So set up, can guarantee that the shaft shoulder and the shaft part that is close to the tail end are in comparatively sealed environment, prevent top corrosion, and the setting of rear end cover 6 can prevent top to top one side drunkenness, convenient to use.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An anti-wear tailstock, comprising:

a tip seat (1);

the center is in clearance fit with the shaft hole of the center seat (1), a bearing (3) is assembled between the center and the center seat (1), and a bearing shaft shoulder (11) is further arranged on the center;

the rotation facilitating assembly is arranged between the shaft shoulder and the top tip seat (1) and is provided with a first bearing plate and a second bearing plate which can rotate relatively, the top tip is sleeved with the first bearing plate and the second bearing plate, the first bearing plate is connected or contacted with the shaft shoulder, and the second bearing plate is connected or contacted with the top tip seat (1).

2. The abrasion-proof tailstock according to claim 1, wherein the first bearing plate is provided with a first annular limiting groove which is coaxial with the tip;

the rolling element is positioned in the first limiting groove and the second limiting groove at the same time, and has the rotational freedom degree in any direction.

3. The wear prevention tailstock according to claim 1, wherein the rotation facilitating assembly is an end bearing.

4. The wear-resistant tailstock according to claim 3, characterized in that said shoulder is provided with an annular and coaxial anti-strain groove (14) of the tip; the inner side groove edge of the strain resisting groove (14) is located on the tip shaft section, and the outer side groove edge is located on the shaft shoulder.

5. The wear-resistant tailstock according to claim 1, wherein the first bearing plate and the second bearing plate are in surface contact fit, and the friction coefficients of the first bearing plate and/or the second bearing plate are both less than min { a, b }, wherein a is the friction coefficient of the shaft shoulder, and b is the friction coefficient of the center seat (1).

6. The wear prevention tailstock according to claim 5, wherein the first and second force bearing plates are Teflon plates.

7. The wear-resistant tailstock according to claim 1, characterized in that said bearings (3) are at least two.

8. The wear-resistant tailstock according to claim 7, characterized in that a spacer (4) is provided between adjacent bearings (3).

9. The wear-resistant tailstock according to any of claims 1 or 7 or 8, characterized in that the bearing (3) is a needle bearing (3).

10. The anti-abrasion tailstock according to claim 1, comprising a front end cover (5) and a rear end cover (6), wherein the front end cover (5) is sleeved on the center and connected with the center seat (1) to form a closed movable cavity, and the force bearing shaft shoulder (11) is located in the movable cavity;

the rear end cover (6) is fixedly connected with the center in a coaxial mode and is in clearance fit connection with the shaft hole of the center seat (1).