CN217572018U - Pre-tensioning lead screw - Google Patents
Pre-tensioning lead screw Download PDFInfo
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- CN217572018U CN217572018U CN202220377598.6U CN202220377598U CN217572018U CN 217572018 U CN217572018 U CN 217572018U CN 202220377598 U CN202220377598 U CN 202220377598U CN 217572018 U CN217572018 U CN 217572018U
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Abstract
The utility model relates to a pre-tensioning lead screw, which comprises a lead screw, wherein a first end and a second end of the lead screw are respectively and rotatably arranged on a motor base and a bearing base through a first bearing and a second bearing, the motor base is also provided with a motor, and the motor is in transmission connection with the first end of the lead screw; the second end of the lead screw is also provided with a pre-tightening mechanism, the pre-tightening mechanism comprises an elastic piece, and the elastic piece is arranged on one side of the second bearing, which deviates from the motor base, and is configured to apply a pre-tightening elastic force to the second bearing; the first end of the screw rod is also provided with an axial limiting mechanism so as to limit the screw rod from the first end to the second end. The two ends of the screw rod are respectively provided with the pre-tightening mechanism and the axial limiting mechanism, so that the pre-tightening force is stably exerted on the screw rod, the pre-tightening effect is stable, the problem that the pre-tightening force of the existing screw rod pair is easy to attenuate or lose efficacy is solved, and the longitudinal repeated positioning precision of the lathe is improved.
Description
Technical Field
The utility model belongs to the technical field of the machining equipment makes, concretely relates to pretension lead screw that lathe used.
Background
The longitudinal ball screw of the existing longitudinal feeding device of the numerical control lathe is driven by a servo motor, a raw yarn bar pair is pre-tightened by a disc spring, and the pre-tightening mode has no stable limit at a power input end, so that the pre-tightening is not reliable, and the longitudinal repeated positioning precision of the numerical control lathe can be directly influenced.
Disclosure of Invention
The utility model aims at providing a prestretch lead screw to solve current lead screw pair, the unstable problem of pretightning force.
The specific scheme is as follows: a pre-tensioning screw comprises a screw rod, wherein a first end and a second end of the screw rod are respectively rotatably arranged on a motor base and a bearing base through a first bearing and a second bearing;
the second end of the screw rod is also provided with a pre-tightening mechanism, the pre-tightening mechanism comprises an elastic piece, and the elastic piece is arranged on one side of the second bearing, which is far away from the motor base, and is configured to apply pre-tightening elastic force to the second bearing;
the first end of the screw rod is also provided with an axial limiting mechanism so as to limit the screw rod from the first end to the second end.
The utility model discloses a further technical scheme does: the elastic part is a belleville spring assembly, the pre-tightening mechanism also comprises a second locking nut and a second bearing retainer ring which are arranged at the two sides of the belleville spring assembly,
the second locking nut is screwed and arranged at the tail end of the second end of the screw rod, and the second bearing retainer ring abuts against the second bearing.
The utility model discloses a further technical scheme does: the butterfly spring component comprises two opposite jointed butterfly spring sheets; the second bearing has two groups, and the tail end of the bearing seat is also provided with a sealing end cover.
The utility model discloses a further technical scheme does: the axial limiting mechanism is arranged in the motor base and comprises a first locking nut and a first bearing retainer ring which are sleeved on the lead screw;
the axial limiting mechanism is arranged on one side, away from the second bearing, of the first bearing, one side of the first bearing retainer ring abuts against the first bearing, and the other end of the first bearing retainer ring abuts against the first locking nut.
The utility model discloses a further technical scheme does: the first end of the screw rod is provided with a sealing groove corresponding to the position of the first bearing retainer ring, and a sealing piece is arranged in the sealing groove.
The utility model discloses a further technical scheme does: the motor base is also provided with an inner sealing assembly and an outer sealing assembly;
the outer sealing assembly comprises an outer flange fixed on the motor base shell, and an outer sealing ring is arranged between the outer flange and the motor base shell;
the inner sealing assembly comprises an inner flange fixed on the inner wall surface of the motor base shell, and the inner flange is arranged on one side of the first bearing, which is far away from the outer sealing assembly, and is abutted against the outer ring of the first bearing;
the inner flange plate is provided with an inner sealing ring, and the inner sealing ring is sleeved on the first bearing retainer ring.
The utility model discloses a further technical scheme does: the inner seal ring is disposed between the inner flange and the first locking nut.
The utility model discloses a further technical scheme does: the first bearings are three in number and are arranged adjacent to each other in sequence.
The utility model discloses a further technical scheme does: the motor is in transmission connection with the lead screw through a coupler; the coupler is a diaphragm expansion sleeve coupler, and the motor base is provided with openable and closed window parts corresponding to the coupler and the axial limiting mechanism.
Has the advantages that: the pre-tensioning screw rod of the utility model comprises a screw rod, wherein a first end and a second end of the screw rod are respectively and rotatably arranged on a motor base and a bearing base through a first bearing and a second bearing, the motor base is also provided with a motor, and the motor is in transmission connection with the first end of the screw rod; the second end of the screw rod is also provided with a pre-tightening mechanism, the pre-tightening mechanism comprises an elastic piece, and the elastic piece is arranged on one side of the second bearing, which is far away from the motor base, and is configured to apply pre-tightening elastic force to the second bearing; the first end of the screw rod is also provided with an axial limiting mechanism so as to limit the screw rod from the first end to the second end. The two ends of the screw rod are respectively provided with the pre-tightening mechanism and the axial limiting mechanism, so that the pre-tightening force is stably exerted on the screw rod, the pre-tightening effect is stable, the problem that the pre-tightening force of the existing screw rod pair is easy to attenuate or lose efficacy is solved, and the longitudinal repeated positioning precision of the lathe is improved.
Drawings
Fig. 1 shows a cross-sectional view of the pre-tensioning screw of the present invention;
fig. 2 shows a schematic view of a partial structure of the present invention when the window of the motor base is opened;
fig. 3 shows the structure schematic diagram of the utility model after the motor base and the bearing seat are removed.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. The components in the drawings are not necessarily to scale, and similar reference numerals are generally used to identify similar components.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
Referring to fig. 1 to 3, this embodiment provides a pre-tensioning screw, which includes a screw 1, a first end and a second end of the screw 1 are rotatably mounted on a motor base 3 and a bearing base 4 through a first bearing 31 and a second bearing 41, respectively, so as to realize the rotational mounting of the screw 1, wherein the screw 1 is further provided with a screw nut 10 to realize axial feeding.
Still be equipped with a servo drive's motor 2 on this motor cabinet 3, this motor 2 is through a shaft coupling 21, and direct and this lead screw 1's first end transmission is connected, and its drive power is more direct, and control reaction is more sensitive, and it is higher to feed the precision.
In order to realize axial pre-tightening, in the embodiment, the pre-tightening mechanism is mainly matched with the limiting mechanism to complete the following steps:
the second end of the screw rod 1 is also provided with a pre-tightening mechanism, the pre-tightening mechanism comprises an elastic part which is a belleville spring assembly 5, the pre-tightening mechanism further comprises a second locking nut 6 and a second bearing retainer ring 50 which are arranged on two sides of the belleville spring assembly 5, all parts of the pre-tightening mechanism are sequentially sleeved on the second end of the screw rod 1 and abut against the bearing seat 4 through a second bearing 41, and therefore the axial application of tensile force to the second end for pre-tightening,
The disc spring assembly 5 is installed on a side of the second bearing 41, which is far away from the motor base 3, and is configured to apply a pre-tightening elastic force to the second bearing; specifically, the belleville spring assembly 5 includes two relatively attached belleville spring plates, the second lock nut 6 is screwed and installed at the tail end of the second end of the screw rod 1, the second bearing retainer ring 50 abuts against the second bearing, and axial tension is applied to the screw rod 1 through the elastic force of the belleville spring assembly 5.
In the embodiment, in order to ensure the rotation precision of the end part of the screw rod 1 and reduce the jumping, two groups of second bearings are provided; meanwhile, one end of the inner side of the bearing seat 3 is provided with a shaft sealing cover, and the tail end of the bearing seat is also provided with a sealing end cover, so that the sealing protection of an internal rotating shaft structure and a pre-tightening structure is realized.
The first end of the screw rod 1 is also provided with an axial limiting mechanism so as to limit the screw rod 1 from the first end to the second end.
Specifically, the axial limiting mechanism is arranged in the motor base 3 and comprises a first locking nut 7 sleeved on the lead screw 1 and a first bearing retainer ring 8.
The axial limiting mechanism is arranged on one side of the first bearing 31, which is far away from the second bearing 41, and one side of the first bearing retainer ring 8 abuts against the first bearing 31 so as to abut against the casing part of the motor base 3 through the first bearing 31, and the other end of the first bearing retainer ring abuts against the first lock nut 7 so as to exert a limiting effect on the first end of the lead screw 1.
Among this limit structure, realize the sealed of motor end and external environment end, have important effect to mechanical life and stability, in this embodiment, on this lead screw 1's the first end, correspond this first bearing retainer ring 8's position, still encircle on this lead screw and be equipped with sealed recess, be equipped with the sealing member in this sealed recess, preferably sealed jump ring or hole sealing washer, bearing retainer ring and lead screw relatively fixed this moment, it is sealed stable, avoid 8 inboard entering pollutants of first bearing retainer ring, influence first bearing.
Simultaneously, on this motor cabinet, still be equipped with interior seal assembly and external seal subassembly:
the outer sealing component comprises an outer flange 32 fixed on the shell of the motor base 3, and an outer sealing ring is arranged between the outer flange 32 and the shell of the motor base 3 to realize shaft sealing of the external environment of the screw rod 1;
the inner sealing assembly comprises an inner flange 33 fixed on the inner wall surface of the motor base shell, the inner flange 33 is arranged on one side of the first bearing 31, which is away from the outer sealing assembly, and abuts against the outer ring of the first bearing 31, so that the first bearing 31 is installed; then, an inner sealing ring is arranged at one end, facing the motor, of the inner flange plate, and the inner sealing ring is sleeved on the first bearing retainer ring 8 to seal the outer side wall surface of the first bearing retainer ring 8. The inner sealing ring is then arranged in a position between the inner flange 33 and the first locking nut 7, axially fixed by the first locking nut 7.
To prevent axial runout, three first bearings 31 are provided, which are disposed adjacent to each other in this order. Meanwhile, the motor 2 is in transmission connection with the lead screw 1 through a coupler 21, in the embodiment, the coupler is a 21-diaphragm expansion sleeve coupler which can transmit power relatively flexibly and can apply axial tension to the lead screw 1 to assist in fixing and pre-tightening; in order to realize the maintenance, the motor base 3 is further provided with an openable and closable window portion 30 at a position corresponding to the coupling 21 and the axial limiting mechanism.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A pre-tensioning screw comprises a screw rod, wherein a first end and a second end of the screw rod are respectively rotatably arranged on a motor base and a bearing base through a first bearing and a second bearing;
the method is characterized in that: the second end of the screw rod is also provided with a pre-tightening mechanism, the pre-tightening mechanism comprises an elastic piece, and the elastic piece is arranged on one side of the second bearing, which is far away from the motor base, and is configured to apply pre-tightening elastic force to the second bearing;
the first end of the screw rod is also provided with an axial limiting mechanism so as to limit the screw rod from the first end to the second end.
2. The pre-tensioned screw of claim 1, wherein: the elastic piece is a belleville spring assembly, the pre-tightening mechanism also comprises a second locking nut and a second bearing retainer ring which are arranged on two sides of the belleville spring assembly,
the second locking nut is screwed and arranged at the tail end of the second end of the screw rod, and the second bearing retainer ring abuts against the second bearing.
3. The pre-tensioned screw of claim 2, wherein: the butterfly spring component comprises two opposite jointed butterfly spring sheets; the second bearing has two groups, and the tail end of the bearing seat is also provided with a sealing end cover.
4. The pre-tensioned yarn bar of claim 1 wherein: the axial limiting mechanism is arranged in the motor base and comprises a first locking nut and a first bearing retainer ring which are sleeved on the lead screw;
the axial limiting mechanism is arranged on one side, away from the second bearing, of the first bearing, one side of the first bearing retainer ring abuts against the first bearing, and the other end of the first bearing retainer ring abuts against the first locking nut.
5. The pre-tensioning screw as set forth in claim 4, wherein: the first end of the screw rod is provided with a sealing groove corresponding to the position of the first bearing retainer ring, and a sealing piece is arranged in the sealing groove.
6. The pre-tensioning screw as set forth in claim 4, wherein: the motor base is also provided with an inner sealing assembly and an outer sealing assembly;
the outer sealing assembly comprises an outer flange fixed on the motor base shell, and an outer sealing ring is arranged between the outer flange and the motor base shell;
the inner sealing assembly comprises an inner flange fixed on the inner wall surface of the motor base shell, and the inner flange is arranged on one side of the first bearing, which is far away from the outer sealing assembly, and is abutted against the outer ring of the first bearing;
the inner flange plate is provided with an inner sealing ring, and the inner sealing ring is sleeved on the first bearing retainer ring.
7. The pre-tensioned screw of claim 6, wherein: the inner seal ring is disposed between the inner flange and the first locking nut.
8. The pre-tensioning screw as set forth in claim 4, wherein: the first bearings are three in number and are arranged adjacent to each other in sequence.
9. The pre-tensioned yarn bar of claim 1 wherein: the motor is in transmission connection with the lead screw through a coupler; the coupler is a diaphragm expansion sleeve coupler, and the motor base is provided with openable and closed window parts corresponding to the coupler and the axial limiting mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220377598.6U CN217572018U (en) | 2022-02-23 | 2022-02-23 | Pre-tensioning lead screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220377598.6U CN217572018U (en) | 2022-02-23 | 2022-02-23 | Pre-tensioning lead screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217572018U true CN217572018U (en) | 2022-10-14 |
Family
ID=83538490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220377598.6U Active CN217572018U (en) | 2022-02-23 | 2022-02-23 | Pre-tensioning lead screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217572018U (en) |
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2022
- 2022-02-23 CN CN202220377598.6U patent/CN217572018U/en active Active
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