CN109916581B - Portable rigidity measuring device and method - Google Patents
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- CN109916581B CN109916581B CN201910236675.9A CN201910236675A CN109916581B CN 109916581 B CN109916581 B CN 109916581B CN 201910236675 A CN201910236675 A CN 201910236675A CN 109916581 B CN109916581 B CN 109916581B
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Abstract
The invention discloses a portable rigidity measuring device and method, and belongs to the technical field of mechanical property testing. The device comprises a driving piece, a thimble and a displacement needle, wherein the driving piece is connected with the thimble, the thimble is positioned in a through hole of the displacement needle, the driving piece is used for driving the thimble to move up and down relative to the displacement needle in the through hole of the displacement needle, a force sensor is arranged at the top end of the thimble, and a displacement sensor is arranged at the top end of the displacement needle. The portable rigidity measuring device and the portable rigidity measuring method provided by the invention can conveniently and efficiently measure the rigidity of large parts in an assembled state, and are convenient, simple and quick in measurement.
Description
Technical Field
The invention relates to the technical field of mechanical performance testing, in particular to a portable rigidity measuring device and method.
Background
Some large mechanical parts like car roofs cannot be measured in the assembled state. Typically, an automobile roof mainly comprises a fabric layer and a substrate layer, deformation is generated under certain pressure, but the rigidity of the roof cannot be too high or too low, the expansion of head airbag explosion can be influenced by the roof with too high rigidity, and the substrate is broken under the pressure of the roof with too low rigidity, so that customer complaints are caused. At present, the rigidity of the ceiling is calculated mainly by carrying out local cutting on the ceiling and then placing a universal tensile machine for test, and the pressure under different deformation is recorded.
Disclosure of Invention
In order to solve the problems in the prior art, the embodiment of the invention provides a portable rigidity measuring device and a portable rigidity measuring method, which can conveniently and efficiently measure rigidity of large parts in an assembled state, and are convenient, simple and quick in measurement. The technical scheme is as follows:
In one aspect, a portable rigidity measurement device is provided, the device includes driving piece, thimble and displacement needle, the driving piece with the thimble is connected, the thimble is located in the through-hole of displacement needle, the driving piece is used for the drive the thimble is in the through-hole of displacement needle is relative the displacement needle up-and-down motion, the thimble top is equipped with force transducer, the displacement needle top is equipped with displacement sensor.
Preferably, the driving member comprises a driver and a driving spring which are connected with each other, the driver is positioned below the driving spring, and the driving spring is connected with the lower end of the thimble above.
Preferably, the device further comprises a base, the base is provided with a base through hole, the driver and the driving spring are located in the base through hole, the driver is fixedly connected with the base, and the lower end of the displacement needle is fixedly connected with the upper end of the base.
Preferably, the thimble is a cylindrical needle, the force sensor is mounted on the top end of the thimble in a embedded manner, and the upper surface of the force sensor is flush with the upper surface of the thimble.
Preferably, the displacement needle is a hollow cylindrical needle, the number of the displacement sensors is 2, the displacement sensors are oppositely embedded at the top end of the displacement needle, and the upper surfaces of the two displacement sensors are flush with the upper surface of the displacement needle.
On the other hand, the rigidity measuring method of the portable rigidity measuring device is also provided, and comprises the following steps:
placing the upper end of the thimble and the upper end of the displacement needle of the portable rigidity measuring device on the surface to be measured of rigidity;
The ejector pin is driven by the driving piece to press the surface to be measured of the rigidity, the force sensor obtains the difference value of acting force before and after pressing, and the displacement sensor obtains the displacement value of deformation before and after pressing;
And obtaining a rigidity value according to the acting force difference value and the deformation displacement value.
Preferably, the stiffness value is calculated by the following equation:
Wherein BW is the stiffness value, unit: n/mm; f1 force value before pressing, F2 force value after pressing, Δf is force difference before and after pressing, unit: n; s1 is a displacement value before pressing, S2 is a displacement value after pressing, Δs is a deformation displacement value before and after pressing, and the units are: mm.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
In summary, according to the portable rigidity measuring device and method provided by the embodiment of the invention, the force sensor arranged on the thimble is used for acquiring the pressed acting force value data, and the displacement sensor arranged on the displacement needle is used for measuring the deformation displacement value data between the displacement needle and the thimble after being pressed, so that the rigidity of the automobile part to be measured is obtained through testing.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a portable stiffness measurement device according to an embodiment of the present invention;
fig. 2 is a flowchart of a rigidity measuring method of the portable rigidity measuring device according to the embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the description of the present invention in terms of "above," "lower end," and the like are defined based on the relationship of orientation or position shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus must be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
According to the portable rigidity measuring device and method provided by the embodiment of the invention, the force sensor arranged on the thimble is used for acquiring the data of the pressed acting force value, and the displacement sensor arranged on the displacement needle is used for measuring the data of the deformation displacement value between the displacement needle and the thimble after being pressed, so that the rigidity of the automobile part to be measured is obtained through testing.
Fig. 1 is a schematic structural view of a portable rigidity measuring device according to an embodiment of the present invention. As shown in fig. 1, the portable rigidity measuring device provided by the embodiment of the invention comprises a driving piece, a thimble 3 and a displacement needle 4.
The driving piece comprises a driver 1 and a driving spring 2 which are connected with each other, the driver 1 is positioned below the driving spring 2, and the driving spring 2 is connected with the lower end of the thimble 3 above. The driving piece is connected with the thimble 3, namely the driving spring 2 is connected with the thimble 3, the thimble 3 is positioned in the through hole of the displacement needle 4, the driving piece is used for driving the thimble 3 to move up and down relative to the displacement needle 4 in the through hole of the displacement needle 4, and the driving spring 2 is used for driving the thimble 3 to move and simultaneously guaranteeing that the thimble 3 stops moving and returns to the original position. The top end of the thimble 3 is provided with a force sensor 31, and the top end of the displacement needle 4 is provided with a displacement sensor 41. The thimble 3 is cylindrical needle, and force sensor 31 is installed on the top of thimble 3 in embedded mode, and the upper surface of force sensor 31 and the upper surface parallel and level of thimble 3, and this kind of setting up mode makes more stable application of force when pressing to ensure force sensor's force measurement accuracy. The displacement needle 4 is hollow cylindrical needle, and the quantity of displacement sensor 41 is 2, and the relative embedded top that sets up at displacement needle 4, and the upper surface of two displacement sensor 41 all with the upper surface parallel and level of displacement needle 4, such setting up mode makes displacement needle 4 stable in structure when pressing to guarantee displacement sensor's displacement survey accuracy.
The portable rigidity measuring device further comprises a base 5, the base 5 is provided with a base through hole, the driver 1 and the driving spring 2 are located in the base through hole, the driver 1 and the base 5 are fixedly connected through bolts 6, and the lower end of the displacement needle 4 is fixedly connected with the upper end of the base 4 through bolts 7. This arrangement makes the overall device more structurally stable when performing stiffness measurements.
The embodiment of the invention also provides a rigidity measuring method of the portable rigidity measuring device, and fig. 2 is a flow chart of the rigidity measuring method of the portable rigidity measuring device provided by the embodiment of the invention, as shown in fig. 2, the rigidity measuring method comprises the following steps:
s1, placing the upper end of a thimble 3 and the upper end of a displacement needle 4 of a portable rigidity measuring device on a surface to be measured of rigidity;
S2, driving the thimble 3 to press the surface to be measured of rigidity through a driving piece, acquiring an acting force difference value before and after pressing by the force sensor 31, and acquiring a deformation displacement value before and after pressing by the displacement sensor 41;
And S3, acquiring a rigidity value according to the acting force difference value and the deformation displacement value.
The above stiffness value is calculated by the following equation:
Wherein BW is the stiffness value, unit: n/mm; f1 force value before pressing, F2 force value after pressing, Δf is force difference before and after pressing, unit: n; s1 is a displacement value before pressing, S2 is a displacement value after pressing, Δs is a deformation displacement value before and after pressing, and the units are: mm.
It should be noted that: in the portable rigidity measuring device according to the above embodiment, when the portable rigidity measuring function is implemented, only the division of the above functional modules is used for illustration, and in practical application, the above functional allocation may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to perform all or part of the functions described above. In addition, the stiffness measurement method of the portable stiffness measurement device provided in the foregoing embodiment belongs to the same concept as the portable stiffness measurement device embodiment, and detailed implementation processes of the stiffness measurement device are shown in the device embodiment, which is not described herein.
Any combination of the above optional solutions may be adopted to form an optional embodiment of the present invention, which is not described herein.
In summary, according to the portable rigidity measuring device and method provided by the embodiment of the invention, the force sensor arranged on the thimble is used for acquiring the pressed acting force value data, and the displacement sensor arranged on the displacement needle is used for measuring the deformation displacement value data between the displacement needle and the thimble after being pressed, so that the rigidity of the automobile part to be measured is obtained through testing.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
While preferred embodiments of the present application 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 application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (3)
1. The portable rigidity measuring device is characterized by comprising a base, a driving piece, a thimble and a displacement needle, wherein the driving piece is connected with the thimble, the thimble is positioned in a through hole of the displacement needle, the driving piece is used for driving the thimble to move up and down in the through hole of the displacement needle relative to the displacement needle, a force sensor is arranged at the top end of the thimble, and a displacement sensor is arranged at the top end of the displacement needle; the lower end of the displacement needle is fixedly connected with the upper end of the base through a bolt;
The force sensor is arranged at the top end of the thimble in an embedded mode, and the upper surface of the force sensor is flush with the upper surface of the thimble;
The number of the displacement sensors is 2, the displacement sensors are oppositely embedded at the top end of the displacement needle, and the upper surfaces of the two displacement sensors are flush with the upper surface of the displacement needle;
placing the upper end of the thimble and the upper end of the displacement needle of the portable rigidity measuring device on the surface to be measured of rigidity;
The ejector pin is driven by the driving piece to press the surface to be measured of the rigidity, the force sensor obtains the difference value of acting force before and after pressing, and the displacement sensor obtains the displacement value of deformation before and after pressing;
Acquiring a rigidity value according to the acting force difference value and the deformation displacement value;
the stiffness value is calculated by the following equation:
Wherein BW is the stiffness value, unit: n/mm; f1 force value before pressing, F2 force value after pressing, Δf is force difference before and after pressing, unit: n; s1 is a displacement value before pressing, S2 is a displacement value after pressing, Δs is a deformation displacement value before and after pressing, and the units are: mm.
2. The device of claim 1, wherein the drive member comprises a driver and a drive spring connected to each other, the driver being located below the drive spring, the drive spring being connected to the upper lower end of the ejector pin.
3. The device of claim 2, wherein the base has a base through hole, the driver and the drive spring are located in the base through hole, and the driver is fixedly connected with the base.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910236675.9A CN109916581B (en) | 2019-03-27 | 2019-03-27 | Portable rigidity measuring device and method |
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| CN201910236675.9A CN109916581B (en) | 2019-03-27 | 2019-03-27 | Portable rigidity measuring device and method |
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| CN109916581B true CN109916581B (en) | 2024-06-07 |
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| CN111964854A (en) * | 2020-07-28 | 2020-11-20 | 北京建筑大学 | System and method for monitoring and evaluating service state of steel spring of floating slab track bed |
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