CN114112149B - Measuring device and measuring method for contact load of moving object - Google Patents
Measuring device and measuring method for contact load of moving object Download PDFInfo
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- CN114112149B CN114112149B CN202111508634.4A CN202111508634A CN114112149B CN 114112149 B CN114112149 B CN 114112149B CN 202111508634 A CN202111508634 A CN 202111508634A CN 114112149 B CN114112149 B CN 114112149B
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
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Abstract
The invention relates to a measuring device and a measuring method for contact load of a moving object, wherein the measuring device comprises a piston rod, one end of the piston rod is provided with a piston, the piston and the piston rod extend into a sleeve with an opening at one end, the periphery of the piston is in contact fit with the inner wall of the sleeve, the piston is connected with the piston rod through a sliding load measuring device, the end face position of the opening of the sleeve is provided with a fixed load measuring device, the sliding load measuring device measures the contact force between the piston and the piston rod in sliding movement, and the fixed load measuring device measures the contact force between the piston rod and the end face of the opening of the sleeve in the relative movement process, so that the dynamic measurement of the contact load of a workpiece in the movement process is realized, the mechanical environment of the workpiece in the actual operation process is accurately perceived, the improvement of the structural design refinement degree is facilitated, the optimization design is developed, and a technical scheme is provided for the development of related test design.
Description
Technical Field
The invention relates to the technical field of load experiments and tests, in particular to a device and a method for measuring contact load of a moving object.
Background
The load of the workpiece in the operation process is an important parameter focused in the structural design optimization process, the traditional design method is to simplify the operation environment of the workpiece, the independent stress condition of each part is obtained through a static strength test or numerical simulation and then multiplied by a certain safety coefficient, and then the design and optimization method is carried out. Therefore, the design refinement degree is improved, the local stress condition of the contact position of the workpiece in the operation process needs to be accurately acquired, a measurement method needs to be established, the local contact load is acquired, and a basis is provided for structural design and optimization.
Disclosure of Invention
The applicant provides a measuring device and a measuring method for the contact load of a reasonable moving object aiming at the situation that the local load, particularly the contact load, in the actual movement process of a piston-sleeve sliding structure cannot be obtained in the prior art, so that the dynamic measurement of the contact load of a workpiece in the movement process is realized, the mechanical environment of the workpiece in the actual operation process is accurately perceived, the refinement degree of structural design is convenient to improve, the optimization design is developed, and a technical scheme is provided for the development of related test designs.
The technical scheme adopted by the invention is as follows:
the utility model provides a measuring device of moving object contact load, includes the piston rod, the piston is installed to piston rod one end, the piston stretches into one end open-ended sleeve together with the piston rod in, the periphery and the sleeve inner wall contact cooperation of piston, the piston is connected with the piston rod through the load measuring device that slides, sleeve opening part terminal surface position is installed fixed load measuring device, the contact force of piston and piston rod in the load measuring device that slides measures sliding motion, the contact force of piston rod and sleeve opening part terminal surface in the relative motion in-process is measured to fixed load measuring device.
The further technical scheme is as follows:
the structure of the sliding load measuring device is as follows: the device comprises a slippage measuring body, wherein a strain sensitive element is arranged on the slippage measuring body.
The fixed load measuring device has the structure that: the strain sensor comprises a fixed measuring body, wherein a strain sensor is arranged on the fixed measuring body.
The middle part of the fixed load measuring device is provided with a through hole, a piston rod penetrates through the through hole, and the inner wall surface of the through hole is matched with the outer wall surface of the piston rod.
The sliding measuring body is of a hollow thin-wall structure, mounting structures matched with the piston and the piston rod are respectively arranged at two ends of the sliding measuring body, a weakening groove with the thickness smaller than that of the inner wall of the sliding measuring body is formed in the middle of the sliding measuring body along the direction perpendicular to the movement direction of the piston, a first through groove and a second through groove are respectively formed in two sides of the weakening groove, and a plurality of spaced strain sensitive elements are arranged on the weakening groove.
The first through groove and the second through groove are uniformly and discontinuously arranged along the periphery of the slippage measuring body, and the discontinuous parts of the adjacent areas on the first through groove and the second through groove are staggered, and the strain sensitive element is arranged on the bottom surface of the weakening groove adjacent to the discontinuous part of the first through groove.
The upper end face and the lower end face of the fixed measurement body are arranged in parallel and are annular, the fixed measurement body is provided with a mounting face which is symmetrically arranged along a horizontal axis, the mounting face is provided with a plurality of bolt holes, the bolt holes and the mounting face are mounted in a matched mode with the end face of the opening of the sleeve, the end face of the opening of the sleeve is provided with a whole circle of assembling holes which correspond to the bolt holes, counter bores are symmetrically formed in the fixed measurement body at two ends of the mounting face, long isolation through grooves and short isolation through grooves are respectively formed in two sides of the counter bores, arc isolation through grooves are formed in the inner ring position of the mounting face, the end portions of the isolation through grooves are communicated with the short isolation through grooves, strain sensitive elements are mounted on the bottom face of the counter bores, and threading holes are formed in the outer peripheral face of the fixed measurement body and are communicated with the counter bores.
The number of the counter bores is four, the counter bores are symmetrically arranged along the horizontal axis and the vertical axis of the fixed measuring body, the end faces of the long isolation through grooves are linear and located on the outer sides of two adjacent counter bores, and the short isolation through grooves are arranged on the inner sides of the single counter bores.
The long isolation through grooves and the short isolation through grooves are arranged in parallel.
A measuring method of a measuring device of a contact load of a moving object,
the method comprises the following operation steps:
step one, preparation work:
designing specific structural forms of a fixed load measuring device and a sliding load measuring device according to measurement requirements;
the slip measuring body and the fixed measuring body are made according to the design drawing paper;
mounting the strain sensitive element on the weakening groove of the slippage measuring body;
the strain sensitive element is arranged on the bottom surface of the counter bore of the fixed measuring body;
secondly, calibrating coefficients:
the strain sensitive elements of the fixed measuring body and the sliding measuring body are respectively formed into a measuring circuit and are connected with an electric signal amplifying and collecting device, and a standard weight or other standard force loading means is adopted to respectively load and unload the fixed measuring body and the sliding measuring body so as to determine the proportional relation and zero position of the electric signal and the force value; determining the measurement accuracy of the fixed load measuring device and the sliding load measuring device through multiple calibration;
thirdly, assembling a fixed load measuring device and a sliding load measuring device:
assembling the sliding measuring body, the piston and the piston rod together, and then loading the sliding measuring body into the sleeve;
the fixed measuring body is arranged at the end face of the opening of the sleeve, and the position where the fixed load is required to be measured is selected by adjusting the installation direction of the installation surface;
fourth step, line connection:
connecting the outgoing line of the strain sensitive element with a corresponding measurement output line;
connecting the measuring output line with a recording instrument;
fifth step, data measurement:
switching on a power supply of the device;
moving the piston rod in an externally driven manner;
the fixed load measuring device and the sliding load measuring device measure and transmit measured data in real time in the moving process of the piston rod, and the recording instrument stores and processes the data;
sixth, data analysis:
and converting the measured electric signal into a physical quantity according to the coefficient obtained by the calibration in the second step, and judging whether the sliding structure form needs to be optimally designed in terms of materials, structures and the like by arranging and analyzing the measured data, wherein the sliding load measuring device measures the contact force and change of the piston and the piston rod in the sliding motion, and the fixed load measuring device measures the contact force and change of the end faces of the piston rod and the sleeve in the relative motion process.
The beneficial effects of the invention are as follows:
the invention has compact and reasonable structure and convenient operation, and solves the problem that the local load, especially the contact load, of the workpiece in the actual motion process can not be measured by designing the integrated design of the fixed load measuring device, the sliding load measuring device and the sliding motion mechanism and providing a load measuring method, can accurately sense the mechanical environment of the workpiece in the actual motion process through the measuring result, improves the refinement degree of the structural design, and has very important reference value for developing and optimizing the design.
Meanwhile, the invention has the following advantages:
(1) The body structure of the load measuring device can be designed in a refinement mode according to the stress conditions of different structures, and the application range is wide.
(2) The mechanical environment of the workpiece in the actual operation process can be accurately perceived through the measurement result, the local load of the workpiece in the operation process is measured in real time, the data size is large and continuous, favorable experimental data are provided for stress analysis, and the method is beneficial to targeted structural design and optimization.
(3) By sensing the mechanical environment of the workpiece, the optimization design can be developed, the service life of the workpiece in an application place is prolonged, the waste of materials generated by unreasonable abrasion is avoided, the use cost is reduced, and the failure rate of related equipment is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is an axial side view of the slip measurement body of the present invention (with the strain sensitive element omitted).
Fig. 3 is a cross-sectional view of the slip measuring body of the present invention.
Fig. 4 is a front axial side view of the stationary measurement body of the present invention (with the strain sensitive element omitted).
FIG. 5 is a rear axial side view of the stationary measurement body of the present invention (with the strain sensitive element omitted).
Fig. 6 is a top view of the stationary measurement body (with the strain sensitive element omitted).
Fig. 7 is a cross-sectional view of section A-A of fig. 6 (with the strain sensitive element omitted).
Wherein: 1. a piston rod; 2. a fixed load measuring device; 3. a slip load measuring device; 4. a piston; 5. a sleeve; 6. a strain sensitive element;
201. fixing the measuring body; 202. a mounting surface; 203. bolt holes; 204. countersink; 205. a threading hole; 206. long isolation through grooves; 207. short isolation through grooves; 208. isolation through grooves;
301. a slip measurement body; 302. weakening the groove; 303. a first through groove; 304. and a second through slot.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the measuring device for the contact load of the moving object of the present embodiment includes a fixed load measuring device 2 and a sliding load measuring device 3, which are suitable for measuring a moving mechanism in a form of a combination of a piston rod 1, a piston 4 and a sleeve 5 and a stress relationship, wherein the piston 4 is installed at one end of the piston rod 1, the piston 4 and the piston rod 1 extend into the sleeve 5 with an opening at one end, the periphery of the piston 4 is in contact fit with the inner wall of the sleeve 5, the piston 4 is connected with the piston rod 1 through the sliding load measuring device 3, the fixed load measuring device 2 is installed at the end surface position of the opening of the sleeve 5, the sliding load measuring device 3 measures the contact force between the piston 4 and the piston rod 1 in sliding movement, and the fixed load measuring device 2 measures the contact force between the end surfaces of the opening of the piston rod 1 and the sleeve 5 in the relative movement process. Through the structure, the integrated design of the measuring device is realized, the force applied to the piston 4 in the moving process is transmitted to the piston rod 1 through the sliding load measuring device 3, the accurate measuring condition is provided, and the dynamic measurement of the contact force between the piston 4 and the piston rod 1 in the sliding movement is realized. The piston rod 1 and the inner side of the fixed load measuring device 2 form contact fit relation, the piston rod 4 is contacted with the fixed load measuring device 2 in the moving process, and the contact force of the piston rod 1 and the through hole in the relative moving process can be measured.
As shown in fig. 2 and 3, the slip load measuring device 3 has a structure in which: comprises a slip measuring body 301, and a strain sensitive element 6 is arranged on the slip measuring body 301.
As shown in fig. 4 and 5, the fixed load measuring device 2 has a structure in which: comprises a fixed measuring body 201, and a strain sensitive element 6 is arranged on the fixed measuring body 201.
The middle part of the fixed load measuring device 2 is provided with a through hole, a piston rod 1 penetrates through the through hole, and the inner wall surface of the through hole is matched with the outer wall surface of the piston rod 1.
As shown in fig. 2 and 3, the sliding measurement body 301 is of a hollow thin-wall structure, two ends of the sliding measurement body 301 are respectively provided with a mounting structure matched with the piston 4 and the piston rod 1, a weakening groove 302 with a thickness smaller than that of the inner wall of the sliding measurement body 301 is formed in the middle of the sliding measurement body 301 along the direction perpendicular to the movement direction of the piston 4, two sides of the weakening groove 302 are respectively provided with a first through groove 303 and a second through groove 304, a plurality of spaced strain sensitive elements 6 are mounted on the weakening groove 302, and the strain sensitive elements 6 are mounted on the bottom surface of the weakening groove 302. Reducing the thickness of the weakening grooves 302 serves to amplify the stress, making strain feedback more pronounced during measurement.
As shown in fig. 3, the first through grooves 303 and the second through grooves 304 are uniformly and intermittently arranged along the periphery of the slippage measuring body 301, and the intermittent portions of adjacent areas on the first through grooves 303 and the second through grooves 304 are staggered, and the strain sensitive element 6 is mounted on the bottom surface of the weakening groove 302 adjacent to the intermittent portions of the first through grooves 303. The strain beam structure is formed at the weakening groove 302, the strain sensitive element 6 is stuck at the bottom (stress concentration position) of the weakening groove 302, and a bridge measuring circuit is formed, so that the transverse load in a specific direction can be measured, and the dynamic measurement of the contact force between the piston 4 and the piston rod 1 in the sliding motion is realized.
As shown in fig. 4-7, the upper end face and the lower end face of the fixed measurement body 201 are arranged in parallel and are annular, the fixed measurement body 201 is provided with a mounting face 202 symmetrically arranged along a horizontal axis, the mounting face 202 is provided with a plurality of bolt holes 203, the bolt holes 203 and the mounting face 202 are matched with the end face of the opening of the sleeve 5, the end face of the opening of the sleeve 5 is provided with a whole circle of matching holes corresponding to the bolt holes 203, counter bores 204 are symmetrically formed in the fixed measurement body 201 at two ends of the mounting face 202, two sides of the counter bores 204 are respectively provided with a long isolation through groove 206 and a short isolation through groove 207, the inner ring of the mounting face 202 is provided with an arc isolation through groove 208, the end part of the isolation through groove 208 is communicated with the short isolation through groove 207, the bottom surface of the counter bore 204 is provided with a strain sensitive element 6, the outer circumferential surface of the fixed measurement body 201 is provided with a threading hole 205, and the threading hole 205 is communicated with the counter bores 204. By designing the long isolation through groove 206, the short isolation through groove 207 and the counter bore 204 to form a strain beam structure, the strain sensitive element 6 is stuck at the stress concentration position, namely the counter bore 204, and a bridge measuring circuit is formed, so that the transverse load in a specific direction can be measured, and the contact force of the end faces of the piston rod 1 and the sleeve 5 in the relative movement process can be realized. The fitting hole of the end face of the opening of the sleeve 5 can be fitted with the bolt hole 203 on the mounting surface 202, and the load measurement in the direction of interest can be selected by adjusting the mounting orientation.
As shown in fig. 6 and 7, the number of counter bores 204 is four, the counter bores are symmetrically arranged along the horizontal axis and the vertical axis of the fixed measuring body 201, the end faces of the long isolation through grooves 206 are linear, the long isolation through grooves are positioned on the outer sides of two adjacent counter bores 204, and the short isolation through grooves 207 are arranged on the inner sides of the single counter bores 204.
The long isolation via 206 is disposed in parallel with the short isolation via 207. The inner side of the fixed measuring body 201 corresponding to the region between the two short isolation through grooves 207 is the position of the measured contact load.
The fixed load measuring device 2 is arranged on the end face of the opening of the sleeve 5, the sliding load measuring device 3 is arranged at the connecting position of the piston 4 and the piston rod 1, and can move along with the piston 4 and the piston rod 1 relative to the sleeve 5, and the two measuring devices are combined for use, so that the contact force of the two fulcrums in the specific direction during the sliding movement of the piston 4 can be measured simultaneously, and the dynamic measurement of the load in the sliding movement process between the piston 4 and the sleeve 5 is realized.
Embodiment one:
the measuring method of the measuring device of the contact load of the moving object of the embodiment comprises the following operation steps:
step one, preparation work:
the specific structural forms of the fixed load measuring device 2 and the sliding load measuring device 3 are designed according to the measuring requirements;
a slip measuring body 301 and a fixed measuring body 201 are made according to design paper;
mounting the strain sensitive element 6 on the weakening groove 302 of the slip measuring body 301;
mounting the strain sensitive element 6 on the bottom surface of the counter bore 204 of the fixed measurement body 201;
secondly, calibrating coefficients:
the strain sensitive elements 6 of the fixed measurement body 201 and the sliding measurement body 301 are respectively formed into a measurement circuit and are connected with an electric signal amplifying and collecting device, and a standard weight or other standard force loading means is adopted to respectively load and unload the fixed measurement body 201 and the sliding measurement body 301 so as to determine the proportional relation and zero position of the electric signal and the force value; determining the measurement accuracy of the fixed load measuring device 2 and the sliding load measuring device 3 through multiple calibration;
third step, assembling the fixed load measuring device 2 and the sliding load measuring device 3:
assembling the sliding measuring body 301 with the piston 4 and the piston rod 1, and then loading the sliding measuring body into the sleeve 5;
the fixed measuring body 201 is arranged at the end face of the opening of the sleeve 5, and the position where the fixed load is required to be measured is selected by adjusting the installation direction of the installation surface 202;
fourth step, line connection:
connecting the outgoing line of the strain sensitive element 6 with a corresponding measurement output line;
connecting the measuring output line with a recording instrument;
fifth step, data measurement:
switching on a power supply of the device;
the piston rod 1 is moved in an externally driven manner;
the fixed load measuring device 2 and the sliding load measuring device 3 measure and transmit measured data in real time in the moving process of the piston rod 1, and the recording instrument stores and processes the data;
sixth, data analysis:
the measured electric signals are converted into physical quantities according to coefficients obtained by calibration in the second step, and through arrangement and analysis of measurement data, the magnitude and change of the contact force between the piston 4 and the piston rod 1 in the sliding movement measured by the sliding load measuring device 3 and the magnitude and change of the contact force between the end faces of the piston rod 1 and the sleeve 5 in the relative movement process are measured by the fixed load measuring device 2, so that the loading condition of the sliding structure form is evaluated, and whether the sliding structure form needs to be optimally designed in terms of materials, structures and the like is judged.
Embodiment two:
the measuring method of the measuring device of the contact load of the moving object of the embodiment comprises the following operation steps:
step one, preparation work:
the specific structural forms of the fixed load measuring device 2 and the sliding load measuring device 3 are designed according to the measuring requirements;
a slippage measuring body 301 is made according to the design paper, the slippage measuring body 301 is of a cylindrical structure, a weakening groove 302 is arranged inside the slippage measuring body,
manufacturing a fixed measurement body 201 according to a design drawing paper, wherein the fixed measurement body 201 is of an annular structure, counter bores 204 are formed in the fixed measurement body 201, the counter bores 204 are vertically arranged along a horizontal axis, and the number of the counter bores 204 is four;
the strain sensitive elements 6 are arranged at the bottom of the weakening groove 302 of the slippage measuring body 301 and are uniformly distributed, and the number of the strain sensitive elements is four;
mounting the strain sensitive element 6 on the bottom surface of the counter bore 204 of the fixed measurement body 201;
secondly, calibrating coefficients:
the strain sensitive elements 6 of the fixed measurement body 201 and the sliding measurement body 301 are respectively formed into a measurement circuit and are connected with an electric signal amplifying and collecting device, and a standard weight or other standard force loading means is adopted to respectively load and unload the fixed measurement body 201 and the sliding measurement body 301 so as to determine the proportional relation and zero position of the electric signal and the force value; determining the measurement accuracy of the fixed load measuring device 2 and the sliding load measuring device 3 through multiple calibration;
third step, assembling the fixed load measuring device 2 and the sliding load measuring device 3:
assembling the sliding measuring body 301 with the piston 4 and the piston rod 1, and then loading the sliding measuring body into the sleeve 5;
horizontally placing a measuring device of the contact load of a moving object;
the fixed measuring body 201 is arranged at the end face of the opening of the sleeve 5, and the position where the fixed load is required to be measured is selected by adjusting the installation direction of the installation surface 202;
setting the long isolation through groove 206 to be horizontal, and then fixing the fixed measurement body 201 and the end face of the opening of the sleeve 5;
fourth step, line connection:
connecting the outgoing line of the strain sensitive element 6 with a corresponding measurement output line;
connecting the measuring output line with a recording instrument;
fifth step, data measurement:
switching on a power supply of the device;
the piston rod 1 is moved in an externally driven manner;
the fixed load measuring device 2 and the sliding load measuring device 3 measure and transmit measured data in real time in the moving process of the piston rod 1, and the recording instrument stores and processes the data;
sixth, data analysis:
by sorting and analyzing the measurement data, the sliding load measuring device 3 measures the contact force and change of the piston 4 and the piston rod 1 in the sliding movement, and the fixed load measuring device 2 measures the contact force and change of the end surfaces of the piston rod 1 and the sleeve 5 in the relative movement process, so as to evaluate the loading condition of the sliding structure form and judge whether the sliding structure form needs to be optimally designed in terms of materials, structures and the like.
The structure and the form of the moving parts of the measuring device are not limited, the whole structure adopts a strain beam structure to measure the contact load so as to amplify the local stress, and the contact load of each part is measured in a moving state. The contact force of the moving part under different states can be reflected more truly from a large amount of continuous data, because the force is not the force required by the moving mechanism in the movement, but is a force which hinders the movement, and the defects of the moving part in terms of materials, structures and the like can be analyzed from the change of the force through dynamic measurement and analysis of the asymmetric force, so that the abrasion or damage of a workpiece caused by the asymmetric force is reduced or avoided.
The above description is intended to illustrate the invention and not to limit it, the scope of which is defined by the claims, and any modifications can be made within the scope of the invention.
Claims (5)
1. The utility model provides a measuring device of moving object contact load, includes piston rod (1), piston (4) are installed to piston rod (1) one end, in piston (4) stretch into one end open-ended sleeve (5) together with piston rod (1), the periphery of piston (4) cooperates its characterized in that with sleeve (5) inner wall contact: the piston (4) is connected with the piston rod (1) through the sliding load measuring device (3), a fixed load measuring device (2) is arranged at the end face position of the opening of the sleeve (5), a through hole is formed in the middle of the fixed load measuring device (2), the piston rod (1) is penetrated in the through hole, the inner wall surface of the through hole is matched with the outer wall surface of the piston rod (1), the sliding load measuring device (3) measures the contact force between the piston (4) and the piston rod (1) in sliding movement, and the fixed load measuring device (2) measures the contact force between the piston rod (1) and the end face of the opening of the sleeve (5) in the relative movement process;
the sliding load measuring device (3) has the structure that: the sliding measurement device comprises a sliding measurement body (301), wherein the sliding measurement body (301) is of a hollow thin-wall structure, two ends of the sliding measurement body (301) are respectively provided with a mounting structure matched with a piston (4) and a piston rod (1), a weakening groove (302) with the thickness smaller than that of the inner wall of the sliding measurement body (301) is formed in the middle of the sliding measurement body (301) along the direction perpendicular to the movement direction of the piston (4), two sides of the weakening groove (302) are respectively provided with a first through groove (303) and a second through groove (304), and a plurality of spaced strain sensitive elements (6) are mounted on the weakening groove (302);
the fixed load measuring device (2) has the structure that: the strain sensor comprises a fixed measuring body (201), wherein a strain sensitive element (6) is arranged on the fixed measuring body (201); the first through grooves (303) and the second through grooves (304) are uniformly and discontinuously arranged along the periphery of the slippage measuring body (301), the discontinuous parts of adjacent areas on the first through grooves (303) and the second through grooves (304) are arranged in a staggered mode, and the strain sensitive elements (6) are arranged on the bottom surfaces of the weakening grooves (302) adjacent to the discontinuous parts of the first through grooves (303).
2. A device for measuring contact load of a moving object as defined in claim 1, wherein: the utility model discloses a measuring device for the strain of the electric motor, including fixed measuring body (201), fixed measuring body (201) are provided with installing face (202) along horizontal axis symmetrical arrangement, be provided with a plurality of bolt holes (203) on installing face (202), bolt hole (203) and installing face (202) are installed with the opening part terminal surface cooperation of sleeve (5), and the opening part terminal surface of sleeve (5) is provided with the mating holes that full circle corresponds with bolt hole (203), and the symmetry is opened on fixed measuring body (201) in both ends of installing face (202) has counter bore (204), the both sides of counter bore (204) are provided with long isolation through groove (206) and short isolation through groove (207) respectively, the inner ring position of installing face (202) is provided with arcly isolation through groove (208), the tip and the short isolation through groove (207) of isolation through groove (208) are linked together, strain sensing element (6) are installed to counter bore (204) bottom surface, the outer peripheral face of fixed measuring body (201) is opened through hole (205), through hole (205) and counter bore (204) intercommunication.
3. A device for measuring contact load of a moving object as defined in claim 2, wherein: the number of the counter bores (204) is four, the counter bores are symmetrically arranged along the horizontal axis and the vertical axis of the fixed measuring body (201), the end faces of the long isolation through grooves (206) are linear and are positioned on the outer sides of two adjacent counter bores (204), and the short isolation through grooves (207) are arranged on the inner sides of the single counter bores (204).
4. A device for measuring contact load of a moving object as defined in claim 2, wherein: the long isolation through groove (206) is arranged in parallel with the short isolation through groove (207).
5. A measurement method using the measurement device for a contact load of a moving object according to claim 2, characterized in that:
the method comprises the following operation steps:
step one, preparation work:
specific structural forms of the fixed load measuring device (2) and the sliding load measuring device (3) are designed according to the measurement requirements;
a slip measuring body (301) and a fixed measuring body (201) are made according to design drawing paper;
mounting the strain sensitive element (6) on a weakening groove (302) of the slip measuring body (301);
the strain sensitive element (6) is arranged on the bottom surface of a counter bore (204) of the fixed measuring body (201);
secondly, calibrating coefficients:
the method comprises the steps that a measuring circuit is formed by a fixed measuring body (201) and a strain sensitive element (6) of a sliding measuring body (301) respectively, the measuring circuit is connected with an electric signal amplifying and collecting device, and standard weights are adopted to load and unload the fixed measuring body (201) and the sliding measuring body (301) respectively so as to determine the proportional relation and zero position of an electric signal and a force value; determining the measurement accuracy of the fixed load measuring device (2) and the sliding load measuring device (3) through multiple calibration;
thirdly, assembling the fixed load measuring device (2) and the sliding load measuring device (3):
assembling the sliding measurement body (301), the piston (4) and the piston rod (1) together, and then loading the sliding measurement body into the sleeve (5);
the fixed measuring body (201) is arranged at the end face of the opening of the sleeve (5), and the position where the fixed load is required to be measured is selected by adjusting the installation direction of the installation surface (202);
fourth step, line connection:
connecting the outgoing line of the strain sensitive element (6) with a corresponding measurement output line;
connecting the measuring output line with a recording instrument;
fifth step, data measurement:
switching on a power supply of the device;
-moving the piston rod (1) in an externally driven manner;
the fixed load measuring device (2) and the sliding load measuring device (3) measure and transmit measured data in real time in the moving process of the piston rod (1), and the recording instrument stores and processes the data;
sixth, data analysis:
and converting the measured electric signals into physical quantities according to coefficients obtained by calibrating in the second step, and evaluating the loading condition of the sliding structural form and whether the sliding structural form needs to be optimally designed in terms of materials and structures by arranging and analyzing measured data, wherein the sliding load measuring device (3) measures the magnitude and change of the contact force between the piston (4) and the piston rod (1) in the sliding motion, and the fixed load measuring device (2) measures the magnitude and change of the contact force between the end faces of the piston rod (1) and the sleeve (5) in the relative motion process.
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| CN202111508634.4A CN114112149B (en) | 2021-12-10 | 2021-12-10 | Measuring device and measuring method for contact load of moving object |
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| CN202111508634.4A CN114112149B (en) | 2021-12-10 | 2021-12-10 | Measuring device and measuring method for contact load of moving object |
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| CN114112149B true CN114112149B (en) | 2023-05-12 |
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| GB1478418A (en) * | 1976-01-30 | 1977-06-29 | Turret Eng Ltd | Load applaying and measuring piston assembly for use with a triaxial load cell |
| SU1237918A1 (en) * | 1982-10-20 | 1986-06-15 | Toloka Valentin | Device for measuring contact forces between piston and cylinder sleeve |
| SU1401346A1 (en) * | 1986-04-21 | 1988-06-07 | Днепропетровский Металлургический Институт Им.Л.И.Брежнева | Device for determining contact pressure |
| DE3920752A1 (en) * | 1989-06-24 | 1991-01-10 | Obering Hermann Bansbach Gmbh | Gas pressure spring with cylinder - contains operating piston, with annular friction piece and control |
| WO1999028716A1 (en) * | 1997-11-26 | 1999-06-10 | Litens Automotive Partnership | Load sensor |
| DE10238788B4 (en) * | 2002-08-23 | 2004-07-29 | Lehmann, Bernhard, Dr. | Optimization of the spring characteristic of a spring damper unit for a motor vehicle wheel suspension |
| DE202016004643U1 (en) * | 2016-07-28 | 2017-11-03 | Bümach Engineering International B.V. | Piston unit of a hydraulic cylinder |
| CZ2018509A3 (en) * | 2018-09-27 | 2020-05-13 | VĂšTS, a.s. | Measuring guide for measuring the radial component of the contact force between the piston rod and the piston rod guide in the shock absorber of a wheeled vehicle |
| DE102020101615A1 (en) * | 2020-01-23 | 2021-07-29 | Weber-Hydraulik Gmbh | Cylinder piston unit with integrated force measuring system |
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2021
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