CN112964444A - Experimental loading and testing device for threaded connection structure - Google Patents
Experimental loading and testing device for threaded connection structure Download PDFInfo
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- CN112964444A CN112964444A CN202110251701.2A CN202110251701A CN112964444A CN 112964444 A CN112964444 A CN 112964444A CN 202110251701 A CN202110251701 A CN 202110251701A CN 112964444 A CN112964444 A CN 112964444A
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- 238000012360 testing method Methods 0.000 title claims abstract description 18
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- 230000001052 transient effect Effects 0.000 claims description 11
- 230000001133 acceleration Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 2
- 230000035939 shock Effects 0.000 claims 1
- 238000011160 research Methods 0.000 abstract description 12
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- 238000013461 design Methods 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 3
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- 238000010168 coupling process Methods 0.000 description 14
- 238000005859 coupling reaction Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910001250 2024 aluminium alloy Inorganic materials 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
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- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides an experimental loading and testing device for a threaded connection structure. In addition, one end of the oscillating bar can move on the pin shaft along the axial direction, and the adjustment of the impact posture of the pendulum bob can be realized by changing the relative position between the oscillating bar and the pin shaft. The invention can realize the adjustment of research variables and provides an effective means for the research of the load transmission mechanism of the thread structure. The invention has the characteristics of reasonable design, low cost, simple and convenient operation, low consumption and energy conservation, and is convenient for research on an experimental table.
Description
Technical Field
The invention relates to the field of load testing of threaded connection structures, in particular to an experimental loading and testing device for researching the load transfer characteristics of a threaded connection structure.
Background
As one of the most common and most simple and effective coupling forms in mechanical structures, a threaded coupling structure plays an important role in the field of mechanical transmission. The thread coupling structure can form complex reciprocating collision motion under impact, high-frequency/high-amplitude response signals generated by the complex reciprocating collision motion can cause severe vibration of internal parts of a motion system, analysis of the signals by a test system can be influenced in engineering, misjudgment of the signals can be directly caused in severe cases, and if the signals are in a fuse structure, the fuse structure can be triggered in advance. Therefore, the study on the load transfer rule of the thread structure under the impact condition has important significance for the actual excitation prediction borne by the fuze in the launching link.
At present, the research on the static load characteristic of a thread structure at home and abroad is mature, for example, the stress distribution, the strength, the looseness prevention, the lubrication and the like of the thread are researched. However, most of researches on the dynamic load characteristics of the thread structure focus on impact simulation and stress analysis of the thread structure, and relatively few researches on the overload signal transmission characteristics are carried out. The domestic Beijing university of nursing staff team adopts the air cannon device to exert vertical transient impact load to the screw thread connection structure to load response signal in the impact process has been gathered, and this experimental apparatus structure, operation are complicated relatively and the cost is higher.
Disclosure of Invention
In view of the above, the present invention provides an experimental loading and testing device for a thread connection structure, the device can realize load size adjustment by applying a transient impact load by using a pendulum, a thread coupling member is placed on a horizontal arc-shaped slide rail, and a high-speed data acquisition system is used to record acceleration data on the thread coupling member in an experimental process, so as to obtain an influence mechanism of impact speed and impact position on a thread structure load transmission rule.
In order to achieve the purpose, the invention adopts the technical scheme that: a thread connection structure experiment loading and testing device comprises a loading mechanism and a high-speed data acquisition system, wherein the loading mechanism is used for applying transient impact load to a thread connector, the high-speed data acquisition system is used for measuring acceleration data of the thread connector, the loading mechanism comprises a buffer device, a horizontal base, a slide rail and an upright post, the slide rail is used for placing the thread connector, the upright post is used for mounting a pendulum bob, the buffer device, the slide rail and the upright post are sequentially arranged on the upper surface of the horizontal base, an angle plate is arranged at the top of the upright post, a pendulum rod is hinged to the inner side of the angle plate, the free end of the pendulum rod is connected to the pendulum bob, when the pendulum bob descends to a certain height under the action of self gravity, the pendulum bob collides with one end;
the high-speed data acquisition system comprises a sensor detachably arranged on the threaded connecting part and a dynamic data acquisition instrument connected with the sensor, and the dynamic data acquisition instrument is connected with the sensor through a lead.
Furthermore, the stand be provided with two, two stand symmetries set up the left and right sides at the slide rail, two stands all set up along vertical direction, and the top of two stands is through round pin hub connection, the pendulum rod is kept away from the one end of pendulum and is connected with the round pin rotation, and the top of one of them stand install the angle scale.
Further, the slide rail includes that arc slide rail and a plurality of interval set up and be used for installing the ball bracket of screw thread connector, be the sliding connection of mutually supporting between a plurality of ball brackets and the arc slide rail.
Furthermore, a plurality of balls are embedded on the outer wall of the ball bracket.
Furthermore, a plurality of pits for mounting the balls are arranged on the outer wall of the ball bracket at intervals.
Further, the bottom of the arc-shaped slide rail is connected to the horizontal base through a plurality of supporting pieces.
Furthermore, buffer includes rubber cushion and the stiff end of fixed setting on horizontal base, and wherein one end and the stiff end of rubber cushion pass through the spring and link to each other, and the other end is just to the setting of threaded connection spare.
Further, the threaded connecting piece is horizontally placed on the sliding rail.
Compared with the prior art, the invention has the beneficial effects that: the invention applies transient impact force to the threaded connecting piece by lifting and releasing the pendulum, the threaded connecting piece is contacted with the rubber pad in the forward moving process, and then the spring is extruded and the speed is reduced, the sensor is fixed on the threaded connecting piece, and the communication is established with the dynamic data acquisition instrument through the lead, and the transient impact load magnitude of the invention can be adjusted through the lifting angle of the pendulum. In addition, one end of the oscillating bar can move on the pin shaft along the axial direction, and the adjustment of the impact posture of the pendulum bob can be realized by changing the relative position between the oscillating bar and the pin shaft. The invention can realize the adjustment of research variables and provides an effective means for the research of the load transmission mechanism of the thread structure. The invention has the characteristics of reasonable design, low cost, simple and convenient operation, low consumption and energy conservation, and is convenient for research on an experimental table.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an experimental loading and testing device for a threaded connection structure according to the present invention;
FIG. 2 is a schematic view of the structure of the buffering device of the present invention;
FIG. 3 is a schematic structural view of the slide rail of the present invention;
FIG. 4 is a schematic view showing the connection relationship between the screw coupling and the ball carrier in the present invention;
the labels in the figure are: 1. the buffer device comprises a buffer device 101, a fixed end 102, a spring 103 and a rubber cushion block; 2. the device comprises a threaded connector, 3, a horizontal base, 4, a sliding rail, 401, an arc-shaped sliding rail, 402, a ball bracket, 403, a ball, 5, a stand column, 6, a pin shaft, 7, an angle scale, 8, a swinging rod, 9, a pendulum bob, 10, a sensor, 11, a lead, 12 and a dynamic data acquisition instrument.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
An experimental loading and testing device for a threaded connection structure, as shown in fig. 1, comprises a loading mechanism for applying a transient impact load to a threaded connection part and a high-speed data acquisition system for measuring acceleration data of the threaded connection part, wherein the loading mechanism comprises: buffer 1, horizontal base 3, slide rail 4, stand 5, round pin axle 6, angle scale 7, pendulum rod 8, pendulum bob 9, high-speed data acquisition system includes: sensor 10, wire 11, dynamic data acquisition appearance 12.
As shown in fig. 2, the buffering device 1 includes a fixed end 101, a spring 102, and a rubber pad 103; as shown in fig. 3 and 4, the slide rail 4 includes an arc-shaped slide rail 401, a ball bracket 402, and a ball 403; the buffer device 1, the slide rail 4 and the upright post 5 are sequentially fixed on the horizontal base 3, the threaded connecting piece 2 is horizontally placed on the slide rail 4, the pin shaft 6 is fixed in a round hole at the upper end of the upright post 5, the swing rod 8 is hinged with the pin shaft 6 through a round sleeve structure at the upper end, the lower end is connected with the pendulum bob 9 through threads, and the angle scale 7 is fixedly connected with the pin shaft 6 through a round hole at the center of the angle scale; in the experiment, the pendulum bob 9 is lifted and released immediately, the pendulum bob 9 performs circular motion by taking the pin shaft 6 as the center of a circle and taking the length of the swing rod 8 as the radius, the pendulum bob 9 collides with the threaded connector 2 in the swinging process so as to apply transient impact force to the threaded connector 2, the size of the transient impact force is adjusted by changing the included angle between the swing rod 8 and the upright post 5, and the accurate angle value can be obtained through the reading of the angle scale 7.
The pendulum 9 strikes the threaded coupling 2 during the downswing, driving the pendulum coupling 2 and the two ball carriers 402 together to slide forward on the curved slide 401; the threaded coupling part 2 is firstly contacted with a rubber cushion block 103 in the buffer device 1 in the forward sliding process, and then the spring 102 is compressed, and the spring 102 continuously outputs resistance to the threaded coupling part 2 in the compression process so as to achieve the aim of speed reduction.
In the embodiment, the number of the sensors 10 is 2, and the sensors are respectively fixed on the internal and external thread assemblies of the threaded connector 2 through adhesives; the sensor 10 is connected with a dynamic data acquisition instrument 12 through a lead 11, the dynamic data acquisition instrument 12 is started to record the dynamic load data of the threaded connecting part 2 in the experimental process, and the load transmission mechanism of the threaded connecting structure under the action of external excitation can be obtained by analyzing the load data of the threaded connecting part 2.
In this embodiment, the total number of the balls 403 is 12, and the balls are respectively embedded in the concave pits formed on the outer walls of the 2 ball brackets 402, and the surfaces of the balls 403 should be kept well lubricated to reduce the rolling friction resistance between the balls and the inner walls of the arc-shaped slide rails 401; the distance between the 2 ball brackets 402 can be adjusted according to the length of the threaded coupling 2, so as to ensure that the threaded coupling 2 can stably and freely slide on the arc-shaped sliding rail 4; the axis of the arc-shaped sliding rail 401 is ensured to be horizontal.
The upper end round sleeve of the swing rod 8 can move on the pin shaft 6 along the axial direction, the adjustment of the impact posture of the pendulum can be realized by changing the relative position between the upper end round sleeve and the pin shaft, and the design can effectively simulate the eccentric impact phenomenon which often occurs in engineering practice.
The left side line of the angle scale 7 should be kept vertical to ensure accurate angle reading.
The threaded coupling part 2, the horizontal base 3, the upright post 5, the pin shaft 6, the angle scale 7, the swing rod 8, the pendulum bob 9, the fixed end 101 and the arc-shaped slide rail 401 are made of No. 45 steel, the spring 102 is made of alloy spring steel, the rubber pad 103 is made of styrene-butadiene rubber, the ball bracket 402 is made of 2024 aluminum alloy, and the balls 403 are made of ball bearing steel.
In this embodiment, the processing roughness of the inner wall of the arc-shaped slide rail 401, the concave pits formed on the outer wall of the ball bearing bracket 402, the pin shaft 6 and the inner wall of the circular sleeve at the upper end of the swing rod 8 is 0.8, and the roughness of the rest parts is 1.6.
In the present embodiment, the sensor 10 is of the type DH1a001, and is configured to output load data of the threaded coupling 2; the model of the dynamic data acquisition instrument 12 is DH5927, the highest sampling rate is 100kHz, and the dynamic data acquisition instrument is used for recording load data of the threaded joint part 2.
The invention applies transient impact force to the threaded connecting piece by lifting and releasing the pendulum, the threaded connecting piece is contacted with the rubber pad in the forward moving process, and then the spring is extruded and the speed is reduced, the sensor is fixed on the threaded connecting piece, and the communication is established with the dynamic data acquisition instrument through the lead, and the transient impact load magnitude of the invention can be adjusted through the lifting angle of the pendulum. In addition, one end of the oscillating bar can move on the pin shaft along the axial direction, and the adjustment of the impact posture of the pendulum bob can be realized by changing the relative position between the oscillating bar and the pin shaft. The invention can realize the adjustment of research variables and provides an effective means for the research of the load transmission mechanism of the thread structure. The invention has the characteristics of reasonable design, low cost, simple and convenient operation, low consumption and energy conservation, and is convenient for research on an experimental table.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides a threaded connection structure experiment loading and testing arrangement, includes the loading mechanism that is used for exerting transient shock load to the threaded connection spare and is used for carrying out the high-speed data acquisition system measured to the acceleration data of threaded connection spare which characterized in that:
the loading mechanism comprises a buffer device, a horizontal base, a slide rail for placing the threaded connector and an upright post for mounting the pendulum bob, the buffer device, the slide rail and the upright post are sequentially arranged on the upper surface of the horizontal base, an angle scale is arranged at the top of the upright post, a swing rod is hinged to the inner side of the angle scale, the free end of the swing rod is connected to the pendulum bob, the pendulum bob collides with one end of the threaded connector when falling to a certain height under the action of self gravity, and the other end of the threaded connector is opposite to the buffer device;
the high-speed data acquisition system comprises a sensor detachably arranged on the threaded connecting part and a dynamic data acquisition instrument connected with the sensor, and the dynamic data acquisition instrument is connected with the sensor through a lead.
2. The experimental loading and testing device for the threaded connection structure as claimed in claim 1, wherein: the pendulum rod is connected with the pendulum bob in a rotating manner through a pin shaft, and the angle scale is installed at the top of one of the two stand columns.
3. The experimental loading and testing device for the threaded connection structure as claimed in claim 1, wherein: the slide rail includes that arc slide rail and a plurality of interval set up and be used for installing the ball bracket of screw thread connector, be the sliding connection of mutually supporting between a plurality of ball brackets and the arc slide rail.
4. The experimental loading and testing device for the threaded connection structure as claimed in claim 3, wherein: the outer wall of the ball bracket is embedded with a plurality of balls.
5. The experimental loading and testing device for the threaded connection structure as claimed in claim 4, wherein: and a plurality of pits for mounting the balls are arranged on the outer wall of the ball bracket at intervals.
6. The experimental loading and testing device for the threaded connection structure as claimed in claim 3, wherein: the bottom of the arc-shaped sliding rail is connected to the horizontal base through a plurality of supporting pieces.
7. The experimental loading and testing device for the threaded connection structure as claimed in claim 1, wherein: the buffer device comprises a rubber cushion block and a fixed end fixedly arranged on the horizontal base, wherein one end of the rubber cushion block is connected with the fixed end through a spring, and the other end of the rubber cushion block is opposite to the threaded connecting piece.
8. The experimental loading and testing device for the threaded connection structure as claimed in claim 1, wherein: the threaded connecting piece is horizontally placed on the sliding rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110251701.2A CN112964444A (en) | 2021-03-08 | 2021-03-08 | Experimental loading and testing device for threaded connection structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110251701.2A CN112964444A (en) | 2021-03-08 | 2021-03-08 | Experimental loading and testing device for threaded connection structure |
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| CN112964444A true CN112964444A (en) | 2021-06-15 |
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| CN202110251701.2A Pending CN112964444A (en) | 2021-03-08 | 2021-03-08 | Experimental loading and testing device for threaded connection structure |
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Cited By (2)
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| CN116537726A (en) * | 2023-05-19 | 2023-08-04 | 宁波市电力设计院有限公司 | Coring device for three-dimensional geological modeling |
| CN117330307A (en) * | 2023-11-30 | 2024-01-02 | 徐州徐工基础工程机械有限公司 | Impact type mechanical product performance test stand |
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| CN116537726A (en) * | 2023-05-19 | 2023-08-04 | 宁波市电力设计院有限公司 | Coring device for three-dimensional geological modeling |
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Application publication date: 20210615 |