CN112393832B - Thimble type micro-impulse applying device for micro-impulse testing mechanism - Google Patents
Thimble type micro-impulse applying device for micro-impulse testing mechanism Download PDFInfo
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- CN112393832B CN112393832B CN202011231602.XA CN202011231602A CN112393832B CN 112393832 B CN112393832 B CN 112393832B CN 202011231602 A CN202011231602 A CN 202011231602A CN 112393832 B CN112393832 B CN 112393832B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0052—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to impact
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Abstract
The invention provides a thimble type micro impulse applying device for a micro impulse testing mechanism, which comprises: the center rod takes a vertically placed position as a balance position; the two thimbles are symmetrically distributed by taking the central rod as an axis, and each thimble is provided with a needle point; the switching structure fixedly connects the center rod with the two thimbles; the impact part is arranged at the lower part of the central rod; the two bearing seats are provided with concave pit arc surfaces, the two ejector pins are placed on the bearing seats, and the needle points of the ejector pins are in contact with the concave pit arc surfaces; the bracket is used for horizontally placing the two bearing blocks; the needle point of the thimble is connected with two contact points of the concave pit arc-shaped surface of the bearing seat to form a horizontal line, the center of gravity of the overall structure of the central rod and the swinging driven by the central rod is lower than the horizontal line, the central rod can swing by taking the horizontal line as a rotating shaft, the contact area is small, and the purpose of reducing friction damping is achieved.
Description
Technical Field
The invention relates to the technical field of precision mechanics, in particular to a thimble type micro-impulse applying device for a micro-impulse testing mechanism.
Background
The application and the accurate measurement of micro-thrust and micro-impulse have important significance in the fields of aerospace propulsion, instrument and equipment manufacturing and the like.
The traditional little impulse testing mechanism of exerting little impulse more uses blade pendulum device: the device is often equipped with a force sensitive sensor at the impact location. The swing arm is pulled for a certain distance through a string, and after the swing arm is released, the swing arm drives the force sensitive sensor to swing and strike a measured object under the action of gravity. The force and time length of the knocking process can be output from the force-sensitive sensor, so that the change of the force acting on the measured object along with the time can be obtained. The impulse acting on the measured object can be adjusted by changing the initial swing angle of the swing arm. However, when the blade pendulum structure is used, the blade is used as a rotating shaft during the swinging, and the contact area between the blade and the supporting structure is large. The problems of micro defects and the like of a contact area easily cause large swing resistance, unstable output results, difficult adjustment and incapability of accurately adjusting the magnitude of the impact force sensitive impulse.
Disclosure of Invention
The invention aims to provide a thimble type micro-impulse applying device for a micro-impulse testing mechanism, which solves the problems of poor stability and large resistance of the existing micro-impulse applying device.
The invention also aims to provide a thimble type micro-impulse applying device for the micro-impulse testing mechanism, so as to solve the problem that the existing micro-impulse applying device cannot accurately adjust the magnitude of the applied micro-impulse.
In order to solve the above technical problems, the present invention provides an ejector pin type micro-impulse applying device for a micro-impulse testing mechanism, comprising:
the central rod takes a vertically placed position as a balance position;
the first thimble and the second thimble are symmetrically distributed by taking the central rod as an axis, and both the first thimble and the second thimble have a needle point;
the switching structure fixedly connects the central rod with the first thimble and the second thimble;
the impact part is arranged at the bottom of the central rod;
first bearing frame and second bearing frame, wherein:
the first bearing seat is provided with a first concave arc-shaped surface, the needle point of the first thimble is in contact with the first concave arc-shaped surface so as to enable the first thimble to be placed on the first bearing seat, and the contact position of the needle point of the first thimble and the first concave arc-shaped surface is a first contact point;
The second bearing seat is provided with a second concave arc-shaped surface, the needle point of the second thimble is in contact with the second concave arc-shaped surface so as to enable the second thimble to be placed on the second bearing seat, and the contact position of the needle point of the second thimble and the second concave arc-shaped surface is a second contact point;
the bracket is used for horizontally placing the first bearing seat and the second bearing seat;
the first contact point and the second contact point are connected to form a horizontal line, the central rod can swing by taking the horizontal line as a rotating shaft, the central rod and a structure driven by the central rod to swing form a swinging structure, and the center of gravity of the swinging structure is lower than the horizontal line.
Optionally, in the thimble-type micro-impulse applying device for the micro-impulse testing mechanism, the central rod is pulled to deviate from the balance position around the rotating shaft, and an angle between the central rod and the balance position is a given initial deflection angle;
and releasing the central rod to enable the central rod to start to rotate under the action of gravity, and driving the impact part to knock on a target by the central rod.
Optionally, in the thimble type micro-impulse applying device for the micro-impulse testing mechanism, the thimble type micro-impulse applying device further includes a weight block mounted on the central rod, wherein:
The central rod is provided with threads;
the balancing weight is in a block shape with a threaded hole, and the balancing weight is connected with the central rod through threaded matching.
Optionally, in the thimble-type micro-impulse applying device for the micro-impulse testing mechanism, the counterweight block rotates in a matching manner through threads to change the height position of the counterweight block on the central rod, and the position of the center of gravity of the swing structure is changed by changing the height position of the counterweight block on the central rod;
when the given initial deflection angle is determined, the closer the position of the gravity center is to the rotating shaft, the smaller the restoring moment generated by gravity is, and the smaller the impulse applied to the target by the impact part is during knocking is;
when the given initial deflection angle is determined, the farther the position of the center of gravity is from the rotating shaft, the larger the restoring moment generated by gravity is, and the larger the impulse applied to the target by the impact portion is at the time of tapping.
Optionally, in the thimble type micro-impulse applying device for the micro-impulse testing mechanism, the hardness of the material of the impact part is selected according to the time required to apply the impulse, and the material of the impact part is metal or rubber.
Optionally, in the thimble type micro-impulse applying device for the micro-impulse testing mechanism, the impact portion is provided with a force sensitive sensor, and the force sensitive sensor is configured to measure a magnitude of a force with which the impact portion strikes the target, a time course of the force with time, and a time for applying the force, and calculate a magnitude of an impulse applied to the target by the impact portion.
Optionally, in the thimble-type micro-impulse applying device for the micro-impulse testing mechanism, the first bearing seat and the second bearing seat are made of ruby or quartz glass, so as to reduce friction damping of the first contact point and the second contact point when the center rod swings.
In the thimble type micro-impulse applying device for the micro-impulse testing mechanism, the first thimble and the second thimble are respectively placed through the first bearing seat and the second bearing seat, the first bearing seat and the second bearing seat are respectively provided with the concave pit arc surfaces, and the needle points of the two thimbles are contacted with the two concave pit arc surfaces, so that the two thimbles are supported on the smooth hard arc surface of the bearing seats, the contact area is small, and the contact point between the needle point and the concave pit arc surfaces does not move in the swinging process. Compare in traditional bearing structure, point surface contact has replaced line surface contact to less area of contact has realized reducing friction damping's effect.
Furthermore, the balancing weight can move up and down along the central rod, and the position of the gravity center of the swinging structure can be continuously adjusted; for the condition that a given initial deflection angle is determined, the initial restoring moment of the swinging structure can be changed by adjusting the position of the gravity center, so that the angular speed when the swinging structure swings to a balance position is changed, and the momentum with different magnitudes can be applied to the target surface by adjusting the position of the gravity center under a certain given initial deflection angle.
In summary, the thimble type micro-impulse applying device for the micro-impulse testing mechanism with the adjustable gravity center provided by the invention has the advantages that the thimble type micro-impulse applying device is stable in operation and extremely low in resistance, and can be used for realizing the precise adjustment of the applied impulse and the micro-impulse applying operation of a target device.
Drawings
FIG. 1 is a schematic structural diagram of a thimble-type micro-impulse applying device for a micro-impulse testing mechanism according to an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating a principle of a balance position of a center rod of the thimble type micro-impulse applying device for the micro-impulse testing mechanism according to another embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating an unbalanced position of a center rod of a thimble-type micro-impulse applying device for a micro-impulse testing mechanism according to another embodiment of the present invention;
shown in the figure: 1-a central rod; 21-a first thimble; 22-a second thimble; 3-a switching structure; 4-a balancing weight; 5-an impact portion; 61-a first bearing seat; 62-a second bearing block; 7-a scaffold; 8-the point of the rotating shaft; 9-position of center of gravity.
Detailed Description
The following describes the thimble type micro-impulse applying device for the micro-impulse testing mechanism according to the present invention with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The core idea of the invention is to provide a thimble type micro-impulse applying device for a micro-impulse testing mechanism, so as to solve the problems of poor stability and large resistance of the existing micro-impulse applying device.
The invention aims to provide a thimble type micro-impulse applying device for a micro-impulse testing mechanism, which solves the problem that the existing micro-impulse applying device cannot accurately adjust the magnitude of applied micro-impulse.
In order to achieve the above-mentioned idea, the present invention provides a thimble type micro-impulse applying device for a micro-impulse testing mechanism, the thimble type micro-impulse applying device comprising: the center rod takes a vertically placed position as a balance position; the first thimble and the second thimble are symmetrically distributed by taking the central rod as an axis, and both the first thimble and the second thimble have a needle point; the switching structure fixedly connects the center rod with the first thimble and the second thimble; the impact part is arranged at the bottom of the central rod; first bearing frame and second bearing frame, wherein: the first bearing seat is provided with a first concave pit arc-shaped surface, the needle point of the first thimble is in contact with the first concave pit arc-shaped surface, so that the first thimble is placed on the first bearing seat, and the contact position of the needle point of the first thimble and the first concave pit arc-shaped surface is a first contact point; the second bearing seat is provided with a second concave pit arc-shaped surface, the needle point of the second thimble is in contact with the second concave pit arc-shaped surface, so that the second thimble is placed on the second bearing seat, and the contact position of the needle point of the second thimble and the second concave pit arc-shaped surface is a second contact point; the bracket is used for horizontally placing the first bearing seat and the second bearing seat; the first contact point and the second contact point are connected to form a horizontal line, the central rod can swing by taking the horizontal line as a rotating shaft, the central rod and a structure driven by the central rod to swing form a swinging structure, and the gravity center of the swinging structure is lower than the horizontal line.
< first embodiment >
In this embodiment, as shown in fig. 1, an ejector pin type micro-impulse applying device for a micro-impulse testing mechanism includes: a central rod 1, as shown in fig. 1-2, the central rod 1 being vertically disposed as a balance position; the first thimble 21 and the second thimble 22 are symmetrically distributed with the central rod 1 as an axis, and both the first thimble 21 and the second thimble 22 have a needle point; the adapter structure 3 is used for fixedly connecting the center rod 1 with the first thimble 21 and the second thimble 22 through the adapter structure 3; the impact part 5 is mounted at the bottom of the central rod 1; a first bearing housing 61 and a second bearing housing 62, wherein: the first bearing seat 61 is provided with a first concave arc-shaped surface, the needle point of the first thimble 21 is in contact with the first concave arc-shaped surface, so that the first thimble 21 is placed on the first bearing seat 61, and the contact position of the needle point of the first thimble 21 and the first concave arc-shaped surface is a first contact point; the second bearing seat 62 has a second concave arc-shaped surface, the needle tip of the second needle 22 contacts with the second concave arc-shaped surface, so that the second needle 22 is placed on the second bearing seat 62, and a contact position of the needle tip of the second needle 22 and the second concave arc-shaped surface is a second contact point; a bracket 7, wherein the bracket 7 is used for horizontally placing a first bearing seat 61 and a second bearing seat 62; the first contact point and the second contact point are connected to form a horizontal line, the central rod 1 can swing by taking the horizontal line as a rotating shaft, the central rod 1 and a structure driven by the central rod to swing form a swinging structure (the central rod 1, the first thimble 21, the second thimble 22, the adapting structure 3 and the impact part 5 in fig. 1 form a swinging structure together), the gravity center of the swinging structure is lower than the horizontal line, so that the whole swinging structure can be supported by only two points (the first contact point and the second contact point), but can keep balance, and the intersection point of the horizontal line and the central rod is a rotating shaft point 8 shown in fig. 2-3.
Specifically, in the thimble type micro-impulse applying device for the micro-impulse testing mechanism, as shown in fig. 3, the central rod 1 is pulled to make the central rod 1 deviate from the equilibrium position around the rotation axis (a rotation axis point 8 shown in fig. 2 to 3), and an angle between the central rod 1 and the equilibrium position is a given initial deflection angle θ; and releasing the central rod 1 so that the central rod 1 starts to rotate under the action of gravity, and the central rod 1 drives the impact part 5 to knock on a target.
Further, in the thimble type micro-impulse applying device for the micro-impulse testing mechanism, the thimble type micro-impulse applying device further includes a weight block 4 mounted on the central rod 1, wherein the central rod 1, the first thimble 21, the second thimble 22, the adapting structure 3 and the impact portion 5 together form a swing structure with the weight block 4, wherein: the central rod 1 is provided with threads; the balancing weight 4 is in a block shape with a threaded hole, so that the central rod 1 penetrates through a hollow structure where the threaded hole is located, and the balancing weight 4 is connected with the central rod 1 through thread matching; the center of gravity of the swing structure is lower than the horizontal line. In the thimble type micro-impulse applying device, the height position of the balancing weight 4 on the central rod 1 is changed through thread matching rotation, and the position 9 of the gravity center of the swinging structure is changed through changing the height position of the balancing weight 4 on the central rod 1; when the given initial deflection angle theta is determined, the closer the position 9 of the gravity center is to the rotating shaft (namely the position 8 of the rotating shaft), the smaller the restoring moment generated by gravity is, and the smaller the impulse applied to the target by the impact part 5 is during knocking is; the farther the position 9 of the center of gravity is from the rotating shaft, the larger the restoring moment generated by gravity is, and the larger the impulse applied to the target by the impact part 5 is during knocking.
In the thimble type micro-impulse applying device for the micro-impulse testing mechanism, the hardness of the material of the impact portion 5 is selected according to the time required for applying the impulse, and the material of the impact portion 5 is metal or rubber. The impact part 5 is provided with a force sensitive sensor which is used for measuring the force of the impact part 5 knocking the target, the change process of the force along with time and the time of applying the force, and calculating the impulse applied to the target by the impact part 5. The first bearing seat 61 and the second bearing seat 62 are made of ruby or quartz glass, so that the frictional damping between the needle point and the contact end (the first contact point and the second contact point) of the arc-shaped surface of the pit is reduced when the central rod 1 swings.
In the thimble type micro-impulse applying device for the micro-impulse testing mechanism, the first thimble 21 and the second thimble 22 are respectively placed on the first bearing seat 61 and the second bearing seat 62, the first bearing seat 61 and the second bearing seat 62 are both provided with the concave pit arc-shaped surfaces, and the needle points of the two thimbles are in contact with the concave pit arc-shaped surfaces, so that the two thimbles are supported on the smooth hard arc surfaces of the two bearing seats, the contact area is small, and the contact point between the needle point and the concave pit arc-shaped surfaces does not move in the swinging process. Compare in traditional bearing structure, point surface contact has replaced line surface contact to less area of contact has realized reducing friction damping's effect.
Furthermore, the balancing weight 4 can move up and down along the central rod 1, and the position 9 of the gravity center of the swinging structure can be continuously adjusted; for the situation that the given initial deflection angle theta is determined, the initial restoring moment of the swinging structure can be changed by adjusting the position 9 of the gravity center, and further the angular speed when the swinging structure swings to the balance position is changed, namely under a certain given initial deflection angle theta, different impulses can be applied to the target surface by adjusting the position of the gravity center.
In summary, the thimble type micro-impulse applying device for the micro-impulse testing mechanism with the adjustable gravity center provided by the invention has the advantages that the thimble type micro-impulse applying device is stable in operation and extremely low in resistance, and can be used for realizing the precise adjustment of the applied impulse and the micro-impulse applying operation of a target device.
In summary, the above embodiments have described in detail different configurations of the thimble type micro-impulse applying device for the micro-impulse testing mechanism, but it is understood that the present invention includes, but is not limited to, the configurations listed in the above embodiments, and any modifications based on the configurations provided in the above embodiments are within the scope of the present invention. One skilled in the art can take the content of the above embodiments to take the inverse three.
The above description is only for the purpose of describing the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are intended to fall within the scope of the appended claims.
Claims (10)
1. The utility model provides a little impulse is thimble type little impulse applying device for accredited testing organization which characterized in that, little impulse is thimble type little impulse applying device for accredited testing organization includes:
the central rod takes a vertically placed position as a balance position;
the first thimble and the second thimble are symmetrically distributed by taking the central rod as an axis, and both the first thimble and the second thimble have a needle point;
first bearing frame and second bearing frame, wherein:
the first bearing seat is provided with a first concave arc-shaped surface, and the needle point of the first ejector pin is in contact with the first concave arc-shaped surface so that the first ejector pin is placed on the first bearing seat;
the second bearing seat is provided with a second concave pit arc-shaped surface, and the needle point of the second ejector pin is in contact with the second concave pit arc-shaped surface, so that the second ejector pin is placed on the second bearing seat.
2. The thimble-type micro-impulse applying device for the micro-impulse testing mechanism of claim 1, wherein a contact point of the tip of the first thimble with the first concave arc surface is a first contact point, a contact point of the tip of the second thimble with the second concave arc surface is a second contact point, the first contact point and the second contact point are connected to form a horizontal line, the central rod can swing around the horizontal line as a rotation axis, the central rod and the structure driven by the central rod swing to form a swing structure, so that the swing structure is supported and balanced by the first contact point and the second contact point, and the center of gravity of the swing structure is lower than the horizontal line;
the two thimbles are supported on the smooth hard cambered surface of the bearing seat, so that the contact area is reduced, the friction damping is reduced, and the contact point between the needle tip and the cambered surface of the concave pit does not move in the swinging process.
3. The thimble type micro-impulse applying device for a micro-impulse testing mechanism of claim 2, further comprising:
the bracket is used for horizontally placing the first bearing seat and the second bearing seat;
the switching structure fixedly connects the center rod with the first thimble and the second thimble;
An impact portion mounted at the bottom of the central rod.
4. The thimble-type micro-impulse applying device for the micro-impulse testing mechanism of claim 3, wherein the central rod, the first thimble, the second thimble, the adapting structure and the impact portion constitute the swinging structure.
5. The thimble type micro-impulse applying device for the micro-impulse testing mechanism according to claim 3, wherein a point where the horizontal line intersects the center rod is a point where a rotation axis is located, and pulling the center rod to deviate the center rod from the equilibrium position around the point where the rotation axis is located, an angle between the center rod and the equilibrium position being a given initial deflection angle;
and releasing the central rod to enable the central rod to start to rotate under the action of gravity, and driving the impact part to knock on a target by the central rod.
6. The thimble-type micro-impulse applying device for the micro-impulse testing mechanism of claim 5, further comprising a weight block mounted on the central rod, wherein:
well core rod, first thimble, second thimble, switching structure and impact part with the balancing weight constitutes swing structure, wherein: the central rod is provided with threads; the balancing weight is in a block shape with a threaded hole, so that the central rod penetrates through the hollow structure where the threaded hole is located.
7. The thimble-type micro-impulse applying device for the micro-impulse testing mechanism according to claim 6, wherein the weight member is rotated by screw-matching to change its height position on the central rod, and the position of the center of gravity of the swing structure is changed by changing the height position of the weight member on the central rod;
when the given initial deflection angle is determined, the closer the position of the gravity center is to the rotating shaft, the smaller the restoring moment generated by gravity is, and the smaller the impulse applied to the target by the impact part is during knocking is;
when the given initial deflection angle is determined, the farther the position of the center of gravity is from the rotation axis, the larger the restoring moment by gravity, and the larger the impulse applied to the target by the impact portion at the time of tapping.
8. The thimble type micro-impulse applying device for the micro-impulse testing mechanism according to claim 7, wherein the hardness of the material of the impact portion is selected according to the time required for the impulse to be applied, and the material of the impact portion is metal or rubber.
9. The thimble-type micro-impulse applying device for the micro-impulse testing mechanism of claim 8, wherein the impact portion has a force sensor thereon, and the force sensor is configured to measure the magnitude of the force applied to the target by the impact portion, the time course of the force and the time of the force application, and calculate the magnitude of the impulse applied to the target by the impact portion.
10. The thimble-type micro-impulse applying device of claim 2, wherein the first and second bearing seats are made of ruby or quartz glass to reduce frictional damping of the first and second contact points when the center rod swings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011231602.XA CN112393832B (en) | 2019-11-21 | 2019-11-21 | Thimble type micro-impulse applying device for micro-impulse testing mechanism |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911145719.3A CN110836758B (en) | 2019-11-21 | 2019-11-21 | Thimble type micro-impulse applying device |
| CN202011231602.XA CN112393832B (en) | 2019-11-21 | 2019-11-21 | Thimble type micro-impulse applying device for micro-impulse testing mechanism |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911145719.3A Division CN110836758B (en) | 2019-11-21 | 2019-11-21 | Thimble type micro-impulse applying device |
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| Publication Number | Publication Date |
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| CN112393832A CN112393832A (en) | 2021-02-23 |
| CN112393832B true CN112393832B (en) | 2022-06-28 |
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| CN201911145719.3A Expired - Fee Related CN110836758B (en) | 2019-11-21 | 2019-11-21 | Thimble type micro-impulse applying device |
| CN202011231602.XA Active CN112393832B (en) | 2019-11-21 | 2019-11-21 | Thimble type micro-impulse applying device for micro-impulse testing mechanism |
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| CN201911145719.3A Expired - Fee Related CN110836758B (en) | 2019-11-21 | 2019-11-21 | Thimble type micro-impulse applying device |
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| WO (1) | WO2021098089A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110836758B (en) * | 2019-11-21 | 2020-11-24 | 中国科学院微小卫星创新研究院 | Thimble type micro-impulse applying device |
| CN112005090B (en) * | 2020-05-12 | 2022-03-15 | 中国科学院微小卫星创新研究院 | Micro-thrust micro-impulse applying device and method based on light pressure principle |
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| CN110836758B (en) * | 2019-11-21 | 2020-11-24 | 中国科学院微小卫星创新研究院 | Thimble type micro-impulse applying device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106507921B (en) * | 2005-11-02 | 2007-08-22 | 中国人民解放军装备学院 | The micro- momentum test device of laser thruster |
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2019
- 2019-11-21 CN CN201911145719.3A patent/CN110836758B/en not_active Expired - Fee Related
- 2019-11-21 CN CN202011231602.XA patent/CN112393832B/en active Active
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2020
- 2020-03-11 WO PCT/CN2020/078737 patent/WO2021098089A1/en active Application Filing
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|---|---|---|---|---|
| GB549140A (en) * | 1940-02-23 | 1942-11-09 | Edward Ernest Simmons Jr | Materials testing apparatus |
| CN102221433A (en) * | 2011-05-31 | 2011-10-19 | 哈尔滨工业大学 | Method for measuring micro impulse by Doppler galvanometer sine-modulated multi-beam laser heterodyne second harmonic |
| DE102014003118A1 (en) * | 2014-03-11 | 2015-09-17 | Alexander Spethmann | Measuring device for the simultaneous simultaneous measurement of charged and uncharged particles and electric currents |
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| Publication number | Publication date |
|---|---|
| WO2021098089A1 (en) | 2021-05-27 |
| CN112393832A (en) | 2021-02-23 |
| CN110836758B (en) | 2020-11-24 |
| CN110836758A (en) | 2020-02-25 |
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