CN204275187U - A kind of screw thread position-limit mechanism - Google Patents
A kind of screw thread position-limit mechanism Download PDFInfo
- Publication number
- CN204275187U CN204275187U CN201420701503.7U CN201420701503U CN204275187U CN 204275187 U CN204275187 U CN 204275187U CN 201420701503 U CN201420701503 U CN 201420701503U CN 204275187 U CN204275187 U CN 204275187U
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- CN
- China
- Prior art keywords
- spacing collar
- female
- nut
- articulation port
- limit mechanism
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- Expired - Fee Related
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Abstract
This utility model provides screw thread position-limit mechanism, comprise spacing collar, screw mandrel and nut, wherein spacing collar comprises male spacing collar and female spacing collar, public spacing collar and screw mandrel are fixed, female spacing collar and nut are fixed, male spacing collar and female spacing collar are provided with articulation port, and the articulation port of male spacing collar and the articulation port of female spacing collar are engaged spacing to realize.The height of the articulation port of spacing collar is the helical pitch of angle on screw mandrel of adjacent two articulation ports.The screw thread position-limit mechanism that this utility model provides is applicable to electron injector inserting needle and inject spacing and prevents thread biting locking, also can be used for the occasion that the fields such as Digit Control Machine Tool, robot, industry control use sliding screw pair of nut.Solve a difficult problem for position-limit mechanism thread biting locking in the past; Replace to stop the mode of rotating stoping rectilinear motion, more obvious limit effect can be reached, and there is higher limit accuracy.Limit accuracy is raising order of magnitude compared with limiting gasket in the past; Protection screw thread, from percussion, improves the life-span of leading screw and nut mechanism.
Description
Technical field
This utility model protects a kind of position-limit mechanism, for electron injector inserting needle and inject spacing with prevent thread biting locking, also can be used for the occasion that the fields such as Digit Control Machine Tool, robot, industry control use sliding screws.
Background technology
In existing frame for movement, in relative movement, easily there is the phenomenon of thread biting locking in screw rod and nut when nut runs to screw rod terminal.In order to prevent this type of situation from occurring, when mostly preceding thread position-limit mechanism is to use limiting gasket to bear axial power, carry out the movement that restrictive axial motion stops nut by force.But this double thread pitch is smaller, the mechanism that inertia is larger does not have the effect preventing thread biting locking completely, screw thread is very easy to sting tight under the combined effect of powerful the moment of inertia and Motor torque, especially when speed is fast, cause interlocking pattern normal pressure very large, this can make stiction much larger than kinetic force of friction, and screw thread is tightly interlocked.Again due to the latching characteristics of screw thread, and stiction is greater than the characteristic of force of sliding friction, is almost difficult to throw off under the effect only by the reactive torque of motor.
When mostly preceding thread position-limit mechanism is smooth limiting gasket, because the boosting function of screw thread makes spacing collar bear very large pressure when stinging tight, the distortion of spacing collar is embodied directly in the location dimension of nut, therefore, error is comparatively large, and can strengthen stiction, causes nut not move smoothly.
Conventional limit mode, in order to reduce thread biting locking may, must screw mandrel make comparatively thin, pitch is less in addition, and spacing existences is impacted, and this can service life of serious reduction feed screw nut.
And under the boosting function of screw thread, spacing Contact impulsive force is very large, while producing vibration and noise, can damage effect to other mechanisms.
Summary of the invention
The screw thread position-limit mechanism that this utility model provides, comprise spacing collar, screw mandrel and nut, wherein spacing collar comprises male spacing collar and female spacing collar, public spacing collar and screw mandrel are fixed, female spacing collar and nut are fixed, male spacing collar and female spacing collar are provided with articulation port, and the articulation port of male spacing collar and the articulation port of female spacing collar are engaged spacing to realize.
The height of the articulation port of spacing collar is the helical pitch of angle on screw mandrel of adjacent two articulation ports.
The quantity of male spacing collar and female spacing collar is 1 ~ 4.
The articulation port of male spacing collar and female spacing collar is provided with rubber blanket.
beneficial effect:
Solve a difficult problem for position-limit mechanism thread biting locking in the past;
Replace to stop the mode of rotating stoping rectilinear motion, more obvious limit effect can be reached, and there is higher limit accuracy, improve a lot compared with limit accuracy and limiting gasket in the past;
Protection screw thread, from percussion, improves the life-span of leading screw and nut mechanism;
Effective absorption mechanical shock, reduces vibration and noise.
Accompanying drawing explanation
The structural representation of the screw thread position-limit mechanism that Fig. 1 provides for this utility model.
The sectional view of the screw thread position-limit mechanism that Fig. 2 provides for this utility model.
The structural representation of the spacing collar of the screw thread position-limit mechanism that Fig. 3 provides for this utility model.
The sectional view of the spacing collar of the screw thread position-limit mechanism that Fig. 4 provides for this utility model.
Detailed description of the invention
According to specific embodiment, this utility model is described in detail below.
As shown in Figure 1, Figure 2, Figure 3 shows, the screw thread position-limit mechanism that the present embodiment provides is made up of paired spacing collar 1 and spacing collar 2, screw mandrel 3 and nut 4, and spacing collar 1 is fixed with screw mandrel 3, and spacing collar 2 is fixed with nut 4.The spacing collar 1 fixed with screw mandrel 3 is public spacing collar, public spacing collar there is screw thread can reach the position of needs along screw thread, public spacing collar and screw mandrel can be made firmly to fix by the method for punching press, spacing collar 2 is fixed with nut 4, be called female spacing collar, female spacing collar and nut 4 once can be engaged operation before fixing, and can eliminate the deviation that machine-building brings.Spacing collar 1 is provided with articulation port 11, and spacing collar 2 is provided with articulation port 21.
As shown in Figure 4, the architectural feature of spacing collar 1 and spacing collar 2 is, the height H of articulation port 11 and articulation port 21 is angle helical pitches on screw mandrel of adjacent two articulation ports, and the quantity of articulation port 11 and articulation port 21 is all 1 ~ 4, in order to ensure that articulation port has enough height.
Wherein, the articulation port of spacing collar 1 and spacing collar 2 generally all adopts two, both can ensure symmetry, also can ensure that there is certain articulation port height, can consider the quantity increasing articulation port when pitch is larger, when pitch is very large time, locking phenomenon disappears, and naturally there will not be thread biting locking.
Spacing collar 1 and spacing collar 2 form the main body of position-limit mechanism, and the articulation port of spacing collar 1 and spacing collar 2 is respectively arranged with rubber blanket 12 and rubber blanket 22, and for buffering with improve the life-span, screw mandrel 3 and nut 4 are carriers of position-limit mechanism.Rubber blanket 12 and rubber blanket 22 have the effect of apparatus with shock absorbing, can improve wearability and service life.
During work, general screw mandrel 3 rotates, nut 4 rectilinear motion, public spacing collar 1 rotates with screw mandrel 3, articulation port 11 and articulation port 21 do not interfere with each other when disengaged, when nut 4 puts in place, articulation port 11 overlaps with the occlusal surface of articulation port 21 and contacts, thus stop the continuation of screw, there is elastic rubber blanket 12 and rubber blanket 22 except absorbing most impact, the angle of inclination that self-assembling formation is certain, play certain energy storage effect, for screw mandrel 3 adverse movement overcomes stiction providing unit sub-power, the suitable effect of angle is effective, thus ensure that adverse movement is smooth.
The height of articulation port 11 and articulation port 21 is angle helical pitches on screw mandrel 3 of adjacent articulation port, and the quantity of articulation port 11 and articulation port 21 is 1 ~ 4 to ensure that articulation port has enough height.The quantity of articulation port 11 and articulation port 21 generally all selects two, because the pitch with the feed screw nut pair of threaded engagement problem is general all smaller, the quantity of articulation port has divided pitch equally, therefore height can be very little, select two articulation ports can ensure stressed symmetricly to ensure maximum tolerance of impacts simultaneously, also can reduce the manufacture process requirement of position-limit mechanism.
Use the mode of spline spacing, high compared to the mode precision of thrust, because the pitch of screw thread is less, an order of magnitude is differed by more than compared to the girth being proportional to the large footpath of screw mandrel, because week and diameter are directly proportional, general pitch 0.5 mm, girth 3*3.14mm=9.42mm differ 10 times and have a surplus, our position-limit mechanism is from girth upper limit, and traditional position-limit mechanism is at pitch direction upper limit.Therefore, error is reduced by the decelerating effect of screw thread, and precision is improved.Consider the impact of other factors on error, limit accuracy improves 10 times.In addition, the thicker girth of screw mandrel is larger, and the ratio of pitch and girth is less, and speed ratio is higher, reduced more of error.
Claims (5)
1. a screw thread position-limit mechanism, comprise spacing collar, screw mandrel and nut, wherein spacing collar comprises male spacing collar and female spacing collar, public spacing collar and screw mandrel are fixed, female spacing collar and nut are fixed, male spacing collar and female spacing collar are provided with articulation port, and the articulation port of male spacing collar and the articulation port of female spacing collar are engaged spacing to realize.
2. screw thread position-limit mechanism according to claim 1, is characterized in that: the height of the articulation port of described spacing collar is the helical pitch of angle on screw mandrel of adjacent two articulation ports.
3. screw thread position-limit mechanism according to claim 2, is characterized in that: described male spacing collar and female spacing collar articulation port quantity be 1 ~ 4.
4. screw thread position-limit mechanism according to claim 3, is characterized in that: the quantity of described male spacing collar and female spacing collar articulation port is 2.
5. screw thread position-limit mechanism according to claim 2, is characterized in that: the articulation port of described male spacing collar and female spacing collar is provided with rubber blanket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420701503.7U CN204275187U (en) | 2014-11-20 | 2014-11-20 | A kind of screw thread position-limit mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420701503.7U CN204275187U (en) | 2014-11-20 | 2014-11-20 | A kind of screw thread position-limit mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204275187U true CN204275187U (en) | 2015-04-22 |
Family
ID=52858391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420701503.7U Expired - Fee Related CN204275187U (en) | 2014-11-20 | 2014-11-20 | A kind of screw thread position-limit mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204275187U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106195067A (en) * | 2016-08-29 | 2016-12-07 | 杭州南宇派科技有限公司 | The driving assembly and manufacture the manufacture method of this driving assembly of a kind of parking braking clamp |
-
2014
- 2014-11-20 CN CN201420701503.7U patent/CN204275187U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106195067A (en) * | 2016-08-29 | 2016-12-07 | 杭州南宇派科技有限公司 | The driving assembly and manufacture the manufacture method of this driving assembly of a kind of parking braking clamp |
| CN106195067B (en) * | 2016-08-29 | 2018-08-28 | 杭州萧冠机械有限公司 | A kind of manufacturing method of the drive component of parking braking clamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20161120 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |