CN223656766U - A type of clamp shaft - Google Patents

Abstract

The embodiment of the utility model provides a fixture shaft, which comprises a shaft rod, wherein an inner shaft sleeve is sleeved on the shaft rod, the inner shaft sleeve is positioned at two sides of the inner shaft sleeve, at least two bearings are sleeved on the inner shaft sleeve, an outer shaft sleeve is sleeved outside the bearings, the bearings are positioned in the outer shaft sleeve, the outer shaft sleeve and the inner shaft sleeve are kept parallel, two ends of the shaft rod extend out of two ends of the outer shaft sleeve, a ring-shaped avoidance space is formed at the first end of the shaft rod, and a fixing groove recessed towards the shaft center is formed at the second end of the shaft rod. The fixture shaft structure has excellent precision performance, convenient installation driving characteristics and a profound pushing effect on industry development, and has extremely high technical value and market potential.

Description

Clamp shaft

Technical Field

The utility model relates to the technical field of motorized spindles, in particular to a clamp shaft.

Background

Along with the development of technology, many devices need to be used for precise elements, and particularly in various fields of aerospace, precise optical instruments, high-end electronic manufacturing and the like, high-precision processing is one of the bottlenecks restricting the development of industry. Such as crystal oscillators used in satellites, chips used in electronic devices, which are manufactured by processes such as photolithography, etching of silicon wafers, and polishing of optical lenses and lenses.

The precision of the fixture shaft, which is an important mechanical component in the field of finish machining, directly affects the precision of the machined equipment, and in some fields requiring precision machining, if the precision of the corresponding rotating shaft cannot meet the requirement, corresponding precision elements, such as silicon wafers, optical glass, quartz crystals and the like, cannot be machined.

However, the precision of the existing fixture shaft is not high enough due to self construction and the like, so that corresponding precision elements cannot be produced, specifically, for example, a large-focal-length optical lens cannot be produced at home at present, the lens is mainly dependent on import, the main reason is that precision equipment generally restricts export internationally, and the related fixture shaft product at home cannot reach corresponding precision, so that the precision requirement cannot be met when the optical lens is polished. Accordingly, the present utility model is directed to a clamp shaft that at least partially addresses the problems that may exist in the prior art.

Disclosure of utility model

In view of the above, embodiments of the present utility model have been made to provide a clamp shaft that overcomes or at least partially solves the above-mentioned problems.

In order to solve the above problems, an embodiment of the present utility model discloses a clamp shaft, including:

The shaft lever is sleeved with an inner shaft sleeve, and the shaft lever is positioned at two sides of the inner shaft sleeve and is respectively sleeved with at least two bearings;

An outer sleeve is sleeved outside the bearing, the bearing is positioned in the outer sleeve, and the outer sleeve is parallel to the inner sleeve;

the two ends of the shaft rod extend out of the two ends of the outer sleeve, the first end of the shaft rod is provided with an annular avoidance space, and the second end of the shaft rod is provided with a fixing groove recessed towards the axis.

Optionally, the shaft lever is positioned at two side positions of the inner shaft sleeve and is respectively sleeved with at least one first bearing and/or one second bearing, or the shaft lever is positioned at two side positions of the inner shaft sleeve, wherein one side of the shaft lever is sleeved with at least two first bearings or two second bearings, and the other side of the shaft lever is sleeved with at least one first bearing and at least one second bearing;

the first bearing is a self-aligning ball bearing, and the second bearing is a deep groove ball bearing.

Optionally, one end of the shaft rod, which is close to the avoidance space, is sleeved with two first bearings and one second bearing, wherein the second bearing is positioned between the two first bearings, or one end of the shaft rod, which is close to the avoidance space, is sleeved with one first bearing and two second bearings, and the first bearing is positioned between the two second bearings;

And one side of the shaft lever, which is close to the fixing groove, is sleeved with two first bearings or two second bearings.

Optionally, an extension end is further arranged at the position, facing the outer side of the fixing groove, of the shaft rod, and a wire opening is formed in the extension end.

Optionally, the shaft rod is located at one side of the avoidance hole, and a disc integrated with the shaft rod is arranged at the position of the end part of the outer sleeve;

The diameter of the disc is not smaller than the inner diameter of the outer sleeve and not larger than the outer diameter of the outer sleeve.

Optionally, the center of the shaft is a hollow cylinder.

Optionally, a functional compression ring is nested and fixed in the outer sleeve and positioned at one side of the avoidance space;

The inner side of the functional compression ring is abutted against the side surface of the outer ring of the bearing;

The outside of function clamping ring is equipped with the oil blanket installation position, the nested oil blanket that is provided with in the oil blanket installation position with the concentric oil blanket of function clamping ring.

Optionally, an end of the outer sleeve is provided with a ring groove at one side of the fixing groove;

The rotary disk is provided with an inner bulge loop and an outer bulge loop at one side, the inner bulge loop is abutted with the side face of the inner ring of the bearing, and the outer bulge loop is embedded in the annular groove and is not abutted with the annular groove.

The embodiment of the utility model has the following advantages:

The shaft rod is sleeved with an inner shaft sleeve, the inner shaft sleeve is positioned at two sides of the inner shaft sleeve, at least two bearings are sleeved on the inner shaft sleeve, an outer shaft sleeve is sleeved outside the bearings, the bearings are positioned in the outer shaft sleeve, the outer shaft sleeve is parallel to the inner shaft sleeve, two ends of the shaft rod extend out of two ends of the outer shaft sleeve, a first end of the shaft rod is provided with an annular avoidance space, and a second end of the shaft rod is provided with a fixing groove recessed towards the axis. The fixture shaft structure has excellent precision performance, convenient installation driving characteristics and a profound pushing effect on industry development, and has extremely high technical value and market potential.

Drawings

FIG. 1 is a schematic view of a fixture shaft according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a fixture shaft according to one embodiment of the present utility model;

Fig. 3 is a schematic cross-sectional view of a fixture shaft according to an embodiment of the utility model.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

Referring to fig. 1 to 3, there is shown a fixture shaft of the present utility model, which comprises a shaft rod 1, an inner shaft sleeve 2 sleeved on the shaft rod 1, at least two bearings sleeved on two sides of the inner shaft sleeve 2, an outer shaft sleeve 3 sleeved on the outer part of the bearings, the bearings positioned in the outer shaft sleeve 3 and kept parallel with the inner shaft sleeve 2, two ends of the shaft rod 1 extending out of two ends of the outer shaft sleeve 3, a ring-shaped avoidance space 104 arranged at a first end of the shaft rod 1, and a fixing groove 102 recessed toward the shaft center arranged at a second end of the shaft rod 1.

Through the structure, the problem that the precision of the traditional fixture shaft is not high enough is solved, and the fixture shaft has the heartbeat and the end jump (roundness error) not larger than 0.002mm and the error not larger than 1-1.5X10 ³ mm, so that the fixture shaft can meet the requirements of a high-precision polishing machine tool, for example, polishing a lens of a high-precision large-caliber long-focus lens, and plays an important role in promoting the development of the domestic precision machining industry. The shaft lever 1, the inner sleeve 2 and the outer sleeve 3 are nested and combined in the structure, and at least two bearings are carefully arranged on two sides of the key inner sleeve, so that a highly stable shafting support structure is constructed. The displacement deviation of the shaft lever in the rotating process is fundamentally limited, so that the shaft lever can always keep an almost ideal rotating axis, and further, the heartbeat (radial runout) and the end runout (roundness error caused by axial runout) are accurately controlled within a minimum range of not more than 0.002 mm. The excellent precision index far exceeds the traditional fixture shaft, provides solid basic guarantee for high-precision machining tasks, effectively avoids the problems of machining marks left on the surface of a workpiece, affecting the dimensional precision and the like due to insufficient precision of a main shaft, and ensures that the machined product meets the near-perfect surface quality and dimensional tolerance requirements.

In particular applications, for example, the polishing composition is excellent in application scenes such as polishing of high-precision and large-caliber tele lenses, which are severe in precision requirements. The processing of the lens not only needs extremely high surface type precision to ensure the optical performance, but also leads to abnormal light refraction and reflection due to fine surface flaws, thereby affecting the imaging quality. The fixture shaft can stably and accurately drive the grinding tool in the lens polishing process by virtue of ultra-precise runout control, realizes fine molding of microscopic contours on the surface of the lens, meets strict standards of the optical industry on curvature precision, surface roughness and the like of the lens, fills a key technical blank of the high-precision fixture shaft in the high-end precise optical processing field in China, and forcefully pushes related industries to advance to higher precision levels.

Through the synergistic effect of the inner shaft sleeve, the outer shaft sleeve and the multi-bearing layout, the comprehensive and high-strength support is provided for the shaft rod, and the strength, the rigidity and the stability of the fixture shaft are improved. The load is shared to many bearings, reduces the pressure that single bearing bore, reduces the wearing and tearing risk, ensures axostylus axostyle 1 long-term steady operation when extension bearing life. The outer sleeve 3 and the inner sleeve 2 are kept parallel, the installation space and the running track of the bearing are further standardized, interference factors such as external vibration and impact are effectively resisted, the clamp shaft can still maintain high-precision operation in a complex industrial processing environment, processing errors caused by environmental factors are reduced, and consistency and stability of processing quality are improved.

In an embodiment of the present application, the shaft rod 1 is located at two sides of the inner sleeve 2, and is respectively sleeved with at least one first bearing 4 and/or one second bearing 5, where the first bearing 4 is a self-aligning ball bearing, and the second bearing 5 is a deep groove ball bearing. The shaft rod 1 may be located at two sides of the inner shaft sleeve 2, wherein one side is sleeved with at least two first bearings 4 or two second bearings 5, and the other side is sleeved with at least one first bearing 4 and at least one second bearing 5;

Further, the shaft 1 is sleeved with two first bearings 4 and one second bearing 5 near one end of the avoidance space 104, wherein the second bearing 5 is located between the two first bearings 4, or one end of the shaft 1 near the avoidance space 104 is sleeved with one first bearing 4 and two second bearings 5, wherein the first bearing 4 is located between the two second bearings 5, and one side of the shaft 1 near the fixing groove 102 is sleeved with two first bearings 4 or two second bearings 5. Referring to fig. 2 and 3, two first bearings 4 and one second bearing 5 are sleeved at one end near the avoidance space 104, and two first bearings 4 are sleeved at the other end.

The aligning ball bearing has an automatic aligning performance as the first bearing 4, and can compensate for a deviation in coaxiality due to a shaft deflection, an installation error, or the like. During operation of the fixture shaft, a certain degree of axial misalignment may occur between the shaft rod 1 and the inner hub 2 due to wear in the machining process, the assembly process or after prolonged use. At this time, the aligning ball bearings positioned at the two sides of the inner shaft sleeve can play a key role, and can be dynamically adjusted through the self aligning structure, so that the shaft rod can still stably rotate, higher rotation precision is maintained, extra vibration and abrasion caused by the fact that the shaft system is not centered are effectively reduced, the whole service life of the fixture shaft is prolonged, and the aligning ball bearings are particularly suitable for precision machining scenes with complex working conditions and high requirements on dynamic stability of the shaft system.

The second bearing 5 is a deep groove ball bearing, has the characteristics of small friction force and high limit rotation speed, and can provide smooth rotation support for the shaft lever. When the clamp shaft runs at a high speed, the low friction characteristic of the clamp shaft is beneficial to reducing energy loss and improving the energy utilization rate, so that the clamp shaft can run more efficiently, and the severe requirements of processing technologies such as high-speed cutting, polishing and the like on the rotating speed are met. Meanwhile, the high limit rotation speed ensures that the bearing cannot fail in advance due to the fact that the rotation speed is too high when the fixture shaft pursues higher processing efficiency and improves productivity, and lays a foundation for higher performance expansion of the fixture shaft.

Through the above-mentioned mixed bearing configuration, specifically, through multiple nimble bearing configuration modes, for example both sides cover respectively and establish a first bearing 4 and/or a second bearing 5 at least, perhaps one side cover is established two at least first bearings 4 or two second bearings 5, and the opposite side cover is established at least a first bearing 4 and at least one second bearing 5, has fully played aligning ball bearing and deep groove ball bearing respective advantage. The mixing arrangement allows tailoring of the bearing layout according to specific processing task requirements, fixture shaft design specifications, expected operating life, etc. For example, for polishing application of some precise optical lenses with extremely high concentricity requirements but relatively moderate rotating speed of the shaft system, the configuration of the aligning ball bearing can be emphasized, and under the working condition that metal parts are milled at high speed and the shaft system installation precision is guaranteed, the duty ratio of the deep groove ball bearing is properly increased, so that the precision can be ensured, high-speed and high-efficiency processing can be realized, and the universality and the adaptability of the fixture shaft are greatly enhanced.

Through the cooperation of the multiple bearings, no matter what specific bearing configuration is adopted, the plurality of bearings are arranged on the two sides of the shaft sleeve 2 in the shaft rod 1, so that the supporting force of the shaft rod is further enhanced. Compared with single bearing type or less configuration, the multi-bearing commonly shares the radial force, axial force and overturning moment born by the shaft lever, so that the shaft lever can still keep a stable rotating state under complex working conditions such as high speed, heavy load and the like, and the problems of shaft lever deformation, bearing abrasion aggravation and the like caused by uneven stress are reduced, thereby continuously ensuring that the excellent heartbeat and end jump precision of the fixture shaft is controlled at a high level not more than 0.002mm, and providing reliable hardware guarantee for high-precision processing. Because different processing tasks can face different working conditions, such as cutting force, rotating speed range, vibration environment and the like, the diversified bearing combination can be flexibly dealt with. The deep groove ball bearing generates force in the aspect of high-speed stable operation, and the deep groove ball bearing supplements each other, so that the clamp shaft can accurately meet the task with extremely high precision requirements such as polishing of high-precision and large-caliber long-focus lens lenses under the relatively noisy and changeable working conditions of a laboratory-level precision processing environment or an industrial field, and the dominant position of the clamp shaft in the precision processing field in the original scheme is consolidated and expanded.

In an embodiment of the present application, an extension end 103 is further disposed at a position outside the fixing groove 102 on the shaft 1, and a screw thread (not shown in the drawing) is disposed on the extension end 103. The fixing groove 102 can be conveniently connected with a transmission mechanism through screw thread fit, for example, a fixing block can be placed in the fixing groove 102 through sleeve shaft connection or gear connection, the fixing block part can protrude out of the fixing groove 102, a notch in the center of a gear or other connecting pieces is aligned with the fixing block, and then the gear or the transmission wheel or other connecting pieces are fixed through screws.

In an embodiment of the present application, the shaft rod 1 is located at one side of the avoidance hole 104, and a disc 101 integrated with the shaft rod 1 is disposed at the end of the outer sleeve 3, where the diameter of the disc 101 is not smaller than the inner diameter of the outer sleeve 3 and not larger than the outer diameter of the outer sleeve 3. The disc 101 prevents, on the one hand, foreign bodies from falling into the outer hub 3, thereby affecting its accuracy, and when rotated, it rotates with the shaft 1.

In an embodiment of the present application, the center of the shaft lever 1 is a hollow cylinder, and the shaft lever 1 is generally rotated during operation, and the inside of the inner shaft sleeve 2 is relatively airtight, especially when the shaft lever 1 rotates at a high speed, the heat generated by the shaft lever 1 is difficult to release from the surface, the hollow cylinder at the center of the shaft lever 1 can play a certain role of heat dissipation, and the overall weight can be reduced.

In an embodiment of the present application, the outer sleeve 3 is located at one side of the avoidance hole 104, and is further provided with a functional compression ring 6 (also referred to as a wire ring) in a nested manner, for compressing the bearing and fixing the oil seal, wherein the inner side of the functional compression ring 6 is abutted against the outer ring side surface of the bearing, the outer side of the functional compression ring 6 is provided with an oil seal installation position, and the oil seal installation position is provided with an oil seal 7 concentric with the functional compression ring 6 in a nested manner. The end part of the outer sleeve 3 is provided with a ring groove at one side of the fixed groove 102, a rotary disk 8 is provided with an inner bulge loop and an outer bulge loop at one side, the inner bulge loop is abutted against the inner ring side surface of the bearing, the outer bulge loop is embedded into the ring groove and is not contacted with the ring groove, the function press ring 6 and the oil seal 7 are passed through, and the rotary disk 8 enables the bearing and the inner sleeve to be stably fixed in the outer sleeve 3, the rotary disk 8 can rotate along with the shaft rod, a driving device such as a gear is prevented from contacting the edge of the outer sleeve 3 when rotating, and meanwhile, protection is formed in the outer sleeve 3.

In the application, through the unique design of the two ends of the shaft lever 1, the annular avoidance space 104 at the first end provides a standardized and convenient interface scheme for the mechanical connection between the fixture shaft and external equipment. Whether with workstation, the anchor clamps base of lathe, or other auxiliary support structure link to each other, can realize quick, firm installation through the connecting piece of simple adaptation, shorten equipment assembly debugging cycle greatly, improve production efficiency. The fixing groove 102 of the second end, which is concave towards the axle center, is accurately matched with the output end of the driving device, so that smooth and efficient power transmission is ensured, the problems of power loss, torsional vibration and the like caused by improper connection are avoided, the clamp shaft can stably and rapidly operate when being driven by power, and the overall processing performance is further optimized.

In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the utility model.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.

While the present utility model has been described in detail with respect to one of the clamping shafts, specific examples are set forth herein to illustrate the principles and embodiments of the present utility model, and are not to be construed as limiting the utility model to any particular extent, as long as those of ordinary skill in the art are able to appreciate the principles and concepts of the present utility model based on the concepts of the present utility model.

Claims (8)

1. A clamp shaft, comprising:

The shaft lever (1) is sleeved with an inner shaft sleeve (2), and is positioned at two sides of the inner shaft sleeve (2) and is respectively sleeved with at least two bearings;

An outer shaft sleeve (3) is sleeved outside the bearing, the bearing is positioned in the outer shaft sleeve (3), and the outer shaft sleeve (3) and the inner shaft sleeve (2) are kept parallel;

The two ends of the shaft lever (1) extend out of the two ends of the outer shaft sleeve (3), an annular avoidance space (104) is formed at the first end of the shaft lever (1), and a fixing groove (102) recessed towards the shaft center is formed at the second end of the shaft lever (1).

2. The fixture shaft according to claim 1, characterized in that the shaft (1) is provided with at least one first bearing (4) and/or one second bearing (5) in the position of both sides of the inner sleeve (2), respectively, or that the shaft (1) is provided with at least two first bearings (4) or two second bearings (5) in the position of both sides of the inner sleeve (2), wherein one side is provided with at least one first bearing (4) and at least one second bearing (5), respectively, and wherein the other side is provided with at least one first bearing (4) and at least one second bearing (5);

The first bearing (4) is a self-aligning ball bearing, and the second bearing (5) is a deep groove ball bearing.

3. The fixture shaft according to claim 2, characterized in that the shaft (1) is provided with two first bearings (4) and one second bearing (5) in a sleeved manner at one end near the avoidance space (104), wherein the second bearing (5) is located between the two first bearings (4), or the shaft (1) is provided with one first bearing (4) and two second bearings (5) in a sleeved manner at one end near the avoidance space (104), wherein the first bearing (4) is located between the two second bearings (5);

The shaft lever (1) is sleeved with two first bearings (4) or two second bearings (5) at one side of the shaft lever, which is close to the fixing groove (102).

4. The fixture shaft according to claim 1, characterized in that the shaft lever (1) is further provided with an extension end (103) towards the outer side of the fixing groove (102), and the extension end (103) is provided with a wire opening.

5. A clamp shaft according to claim 1, characterized in that the shaft (1) is located on one side of the clearance space (104) and that a disc (101) integral with the shaft (1) is provided at the position of the end of the outer sleeve (3);

The diameter of the disc (101) is not smaller than the inner diameter of the outer shaft sleeve (3) and not larger than the outer diameter of the outer shaft sleeve (3).

6. A clamp shaft according to claim 1, characterized in that the centre of the shaft (1) is a hollow cylinder.

7. The clamp shaft according to claim 1, characterized in that a functional compression ring (6) is nested and fixed in the outer sleeve (3) at one side of the avoidance space (104);

the inner side of the functional compression ring (6) is abutted against the side surface of the outer ring of the bearing;

The outside of function clamping ring (6) is equipped with the oil blanket installation position, the nested oil blanket (7) that are provided with concentric with function clamping ring (6) in the oil blanket installation position.

8. The clamp shaft according to claim 1, characterized in that the end of the outer sleeve (3) on one side of the fixing groove (102) is provided with a ring groove;

An inner bulge loop and an outer bulge loop are arranged on one side of the rotating disc (8), and the inner bulge loop is abutted with the side face of the inner ring of the bearing;

the outer convex ring is embedded in the annular groove and is not contacted with the annular groove.