CN215491562U - Variable gauge length cable strain measurement system - Google Patents

Abstract

The utility model relates to the technical field of cable strain measurement, in particular to a variable gauge length cable strain measurement system which comprises two groups of measurement components, wherein each group of measurement components comprises a cable clamp, a baffle and a displacement detection piece, the cable clamp can be clamped and fixed with a measured cable at any position on the measured cable, the baffle is fixedly arranged and opposite to the cable clamp at intervals, a through hole for the measured cable to pass through is formed in the baffle, and the displacement detection piece is used for measuring the displacement of the cable clamp relative to the baffle. During the use, make the experimental gauge length of distance between two fastener clamps for the requirement, at the cable test process of being surveyed, displacement detection spare through two sets of measuring component measures the displacement volume of the relative baffle of two sets of fastener clamps respectively. Through the adjustment of the fixed position clamped by the two wire clamp clamps and the tested cable, the test gauge length can be adjusted at will, and the test gauge length required at will is realized.

Description

Variable gauge length cable strain measurement system

Technical Field

The utility model relates to the technical field of cable strain measurement, in particular to a variable gauge length cable strain measurement system.

Background

According to IEC 61395: the 2007 (GB/T22077-. This requires that the creep test gauge length be easily adjustable according to the diameter of the sample to be tested and the test standard. For the stress-strain test and the linear expansion coefficient test, the initial gauge length is also different in different standards and technical specifications, and the test gauge length also needs to be conveniently adjusted.

At present, in creep test, stress-strain test, the coefficient of linear expansion test of electric wire and cable (cable), the gauge length is confirmed to the metal extension pole of generally adopting, and its adjustable range is less (adjustable range is 1000mm-2000mm) to metal extension pole self weight is showing along with length increases and is increasing, and rigidity then is showing and is descending, and when the experimental gauge length that requires is great, the bending of self of overlength metal extension pole can influence the test result, and the installation is inconvenient. In the large-gauge-length measurement process, the traditional displacement sensor is large in size, small in measuring range and low in precision, and the metal extension rod can be seriously deformed due to torsion in the cable test process, so that the displacement measurement result violently jumps, and even a top rod of the displacement sensor is clamped in the serious process, so that equipment is damaged.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a variable gauge length cable strain measurement system capable of randomly adjusting the length of a test gauge length so as to overcome the defects in the prior art.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a variable gauge length cable strain measurement system, includes two sets of measuring component, every measuring component of group all includes fastener fixture, baffle and displacement detection piece, and fastener fixture can be on being surveyed the cable optional position department with be surveyed cable clamp and hold fixedly, and the baffle is fixed to be set up and relative with fastener fixture interval, offers the through-hole that the confession was surveyed the cable and passes through on the baffle, and the displacement detection piece is used for measuring the displacement volume of the relative baffle of fastener fixture.

Preferably, the cable clamp is detachably sleeved with a haven pipe, and the inner diameter of the haven pipe is matched with the diameter of the cable to be tested.

Preferably, the clamp fixture comprises an upper clamp half and a lower clamp half which are detachably butted, the centers of the upper clamp half and the lower clamp half are respectively provided with a fixture groove, and the two fixture grooves are butted to form a mounting hole for accommodating the haversian tube.

Preferably, the displacement detection piece is a laser displacement sensor, and the laser displacement sensor is arranged on the wire clamp fixture and is opposite to the baffle at intervals.

Preferably, the wire clamp fixture is provided with a plurality of laser displacement sensors, and the plurality of laser displacement sensors are arranged at equal intervals along the circumferential direction of the measured cable.

Preferably, the device further comprises a data acquisition unit, and the laser displacement sensor is connected with the data acquisition unit.

Preferably, the baffle is liftably mounted on the base by a height adjustment device.

Preferably, the height adjusting device comprises a connecting rod and an adjusting piece, one end of the connecting rod is connected with the baffle, and the other end of the connecting rod is arranged on the base in a liftable mode through the adjusting piece.

Preferably, the baffle includes the baffle upper half and the baffle lower half that detachably docks mutually, and the baffle upper half all is equipped with the baffle recess with the baffle lower half center, and two baffle recesses dock mutually and constitute the through-hole of baffle.

Compared with the prior art, the utility model has the remarkable progress that:

the distance between the two groups of measuring assemblies and the wire clamp clamps clamped and fixed by the measured cable is taken as a test gauge length, and the test gauge length can be adjusted at will according to the diameter of the measured cable and different requirements of test standards by adjusting the clamping and fixing positions of the two wire clamp clamps and the measured cable, so that the length of the test gauge length at will is realized, and the device has the advantages of convenience in adjustment and large adjustable range; the displacement detection piece through two sets of measuring component measures the displacement volume of the relative baffle of two sets of fastener clamps respectively and obtains the total elongation of the measured cable in the experimental gauge length, can adapt to the measurement of the measured cable strain in arbitrary experimental gauge length, guarantees that the test result is accurate. Therefore, the problem that the length of the test gauge length is variable due to different requirements of the diameter of the tested cable and the test standard in the tested cable test is solved, and the defects that a metal extension rod is large in size, complex in structure, inconvenient to install and poor in rigidity along with the increase of the length of the metal extension rod are effectively overcome.

Drawings

Fig. 1 is a schematic front view of a variable gauge cable strain measurement system according to an embodiment of the present invention.

Fig. 2 is a schematic side view of a wire clamp fixture and a displacement detection member in the variable gauge cable strain measurement system according to an embodiment of the present invention.

FIG. 3 is a schematic side view of a baffle in a variable gauge cable strain measurement system according to an embodiment of the utility model.

Wherein the reference numerals are as follows:

1 wire clamp fixture

1a clamp upper half

1b lower part of fixture

10 mounting hole

2 baffle plate

2a baffle upper half

2b baffle lower half

20 through hole

21 bolt

3 Displacement detecting element

4 tested cable

5 haver tube

6 data acquisition unit

60 data transmission line

7 base

8 connecting rod

9 adjusting part

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1 to 3, an embodiment of the present invention provides a variable gauge length cable strain measurement system.

Referring to fig. 1, the variable gauge length cable strain measurement system of this embodiment includes two sets of measuring component, every measuring component of group all includes fastener fixture 1, baffle 2 and displacement detection piece 3, fastener fixture 1 can be on being surveyed cable 4 optional position department and being surveyed 4 centre grippings of cable fixed, baffle 2 is fixed to be set up and relative with fastener fixture 1 interval, set up the through-hole 20 that supplies to be surveyed cable 4 and pass through on the baffle 2, be surveyed cable 4 movably and wear to locate the through-hole 20 of baffle 2, displacement detection piece 3 is used for measuring the displacement volume of fastener fixture 1 relative to baffle 2. The variable gauge length cable strain measurement system can be used for measuring the strain of the measured cable 4 in the test process of the measured cable 4 (such as creep test, stress-strain test and linear expansion coefficient test). During use, a tested cable 4 is installed in a tension system of a testing device, an initial load is applied to the tested cable 4 through the tension system of the testing device, the tested cable 4 is in a straightened state, then the cable clamp fixtures 1 of the two groups of measuring assemblies are respectively clamped and fixed with the tested cable 4, the distance between the two cable clamp fixtures 1 is a required test standard distance, the two cable clamp fixtures 1 are preferably installed and fixed on two sides of the midpoint of the tested cable 4 at equal intervals, then the baffle plates 2 of the two groups of measuring assemblies are respectively placed between the two cable clamp fixtures 1, the two baffle plates 2 are respectively fixed at positions close to the two cable clamp fixtures 1, the interval distance between the baffle plates 2 and the corresponding cable clamp fixtures 1 is determined according to the measuring range of the displacement detecting piece 3, in the testing process of the tested cable 4, the two cable clamp fixtures 1 move along with the extension of the tested cable 4, and the displacement detecting pieces 3 of the two groups of measuring assemblies are respectively used for measuring the displacement of the cable clamp fixtures 1 relative to the baffle plates 2 And summing the two groups of measured values to obtain the total elongation of the measured cable 4 in the test gauge length, wherein the ratio of the total elongation to the test gauge length is the strain of the measured cable 4.

According to the variable-gauge cable strain measurement system, the distance between two groups of measurement assemblies and the wire clamp fixture 1 clamped and fixed by the measured cable 4 is taken as the test gauge length, and the test gauge length can be adjusted at will according to the diameter of the measured cable 4 and different requirements of test standards by adjusting the clamping and fixing positions of the two wire clamp fixtures 1 and the measured cable 4, so that the length of the test gauge length at will is adjusted conveniently, and the adjustable range is large; the displacement detection piece 3 through two sets of measuring component measures the displacement volume of the relative baffle 2 of two sets of fastener fixture 1 respectively and obtains the total elongation of measured cable 4 in the experimental scale distance, can adapt to the measurement of measured cable 4 strain in the arbitrary experimental scale distance, guarantees that the test result is accurate. From this, the variable gauge length cable strain measurement system of this embodiment has solved because of the different problem that requires experimental gauge length variable of measured 4 diameters of cable and test standard in the measured cable 4 is experimental, has effectively avoided metal extensional pole bulky, structure complicacy, installation inconvenience, rigidity along with the defect that self length increases and worsen.

Referring to fig. 1 and 2, in the present embodiment, preferably, the cable clamp 1 is detachably sleeved with a haven tube 5, an inner diameter of the haven tube 5 matches a diameter of the cable 4 to be tested, and the cable 4 to be tested is accommodated in the haven tube 5 and is in contact with the haven tube 5 for fixation, thereby achieving clamping fixation of the cable clamp 1 and the cable 4 to be tested. The haversian pipe 5 is detachably sleeved in the wire clamp fixture 1, the haversian pipe 5 can be disassembled, assembled and replaced, and therefore the suitable haversian pipe 5 matched with the tested cable 4 can be selected according to the diameter of the tested cable, and the application range of the variable-gauge-length cable strain measurement system is widened.

Preferably, referring to fig. 2, the cable clamp 1 comprises an upper clamp half 1a and a lower clamp half 1b which are detachably butted, the centers of the upper clamp half 1a and the lower clamp half 1b are respectively provided with a clamp groove, and the two clamp grooves are butted to form a mounting hole 10 for accommodating the haversian pipe 5, so that the assembly of the cable clamp 1, the haversian pipe 5 and the tested cable 4 can be facilitated in use.

In this embodiment, preferably, the displacement detection part 3 in the measurement assembly is a laser displacement sensor, the laser displacement sensor is mounted on the wire clamp fixture 1 and is arranged opposite to the baffle 2 at an interval, and the distance between the baffle 2 and the wire clamp fixture 1 is such that the baffle 2 is within the optimal range of the laser displacement sensor. The non-contact laser displacement sensor is adopted to measure the displacement of the wire clamp fixture 1 relative to the baffle 2, so that the severe jump and distortion of the measurement result caused by the torsion of the measured cable 4 in the test process can be effectively avoided, the displacement measurement precision under a larger test gauge length can be effectively improved, and the method has the advantages of high measurement precision, small size and convenience in installation and maintenance.

Preferably, a plurality of laser displacement sensors can be arranged on the wire clamp fixture 1 of each group of measuring components at equal intervals along the circumferential direction of the measured cable 4, and the displacement of the wire clamp fixture 1 measured by the displacement detecting piece 3 of each group of measuring components relative to the baffle 2 is the average value of the measured values of the plurality of laser displacement sensors, so that the accuracy of the measuring result can be further ensured. The number of the laser displacement sensors arranged on the wire clamp fixture 1 of each group of measuring assemblies is not limited, and can be selected according to the diameter of the measured cable 4.

Further, referring to fig. 1 and fig. 2, the system for measuring the strain of the variable gauge length cable further includes a data acquisition unit 6, the laser displacement sensor is connected to the data acquisition unit 6, and the laser displacement sensor may be connected to the data acquisition unit 6 through a data transmission line 60. The laser displacement sensor transmits the measured displacement information to the data collector 6, and the data collector 6 receives the displacement information measured by all the laser displacement sensors and calculates and displays the strain of the measured cable 4 according to the received information. The form of the data acquisition unit 6 is not limited, and an existing controller, such as a PLC controller or a single chip microcomputer, may be adopted.

Referring to fig. 1 and 3, in the present embodiment, preferably, the baffle 2 is liftably mounted on the base 7 through a height adjusting device, the base 7 is a fixed base, and the height adjusting device fixes the baffle 2 on the base 7 and matches the height of the baffle 2 with the height of the cable 4 to be measured mounted in the tension system of the testing apparatus, so that the axis of the through hole 20 on the baffle 2 coincides with the axis of the cable 4 to be measured. Therefore, the device can adapt to different tested cable 4 center heights in different testing devices.

Preferably, referring to fig. 1, the height adjusting device comprises a connecting rod 8 and an adjusting member, one end of the connecting rod 8 is connected with the baffle 2, and the other end of the connecting rod 8 is liftably mounted on the base 7 through the adjusting member 9. The adjusting part 9 can be a screw, a plurality of connecting holes can be formed in the connecting rod 8, the connecting holes are distributed along the axial direction of the connecting rod 8, the base 7 is tightly connected with one connecting hole in the connecting rod 8 through the screw, and the fixing of the baffle 2 on the base 7 and the height adjustment of the baffle 2 relative to the base 7 can be realized.

In this embodiment, preferably, referring to fig. 3, the baffle 2 includes a baffle upper half 2a and a baffle lower half 2b detachably butted with each other, the baffle upper half 2a and the baffle lower half 2b can be detachably connected by bolts 21, the centers of the baffle upper half 2a and the baffle lower half 2b are both provided with baffle grooves, the two baffle grooves are butted to form a through hole 20 of the baffle 2, and the diameter of the through hole 20 is larger than that of the cable 4 to be measured, thereby facilitating the assembly of the baffle 2 and the cable 4 to be measured in use. In this embodiment, the baffle 2 is a circular smooth metal baffle.

Based on the variable gauge length cable strain measurement system, the embodiment of the utility model also provides a variable gauge length cable strain measurement method. The method for measuring the strain of the cable with the variable gauge length adopts the system for measuring the strain of the cable with the variable gauge length of the embodiment, the cable clamp fixtures 1 of two groups of measuring components are respectively clamped and fixed with the measured cable 4, the distance between the two cable clamp fixtures 1 is enabled to be a required test gauge length, the baffle plates 2 of the two groups of measuring components are enabled to be positioned between the two cable clamp fixtures 1, in the test process of the measured cable 4, the displacement of the two groups of cable clamp fixtures 1 relative to the baffle plates 2 is respectively measured through the displacement detection pieces 3 of the two groups of measuring components, the two groups of measured values are summed, namely, the total elongation of the measured cable 4 in the test gauge length is obtained, and the ratio of the total elongation to the test gauge length is the strain of the measured cable 4.

According to the method for measuring the strain of the cable with the variable gauge length, the distance between two groups of measuring assemblies and the wire clamp fixture 1 clamped and fixed by the measured cable 4 is used as the test gauge length, and the test gauge length can be adjusted at will according to the diameter of the measured cable 4 and different requirements of test standards by adjusting the clamping and fixing positions of the two wire clamp fixtures 1 and the measured cable 4, so that the length of the test gauge length at will is adjusted conveniently, and the adjustable range is large; the displacement detection piece 3 through two sets of measuring component measures the displacement volume of the relative baffle 2 of two sets of fastener fixture 1 respectively and obtains the total elongation of measured cable 4 in the experimental scale distance, can adapt to the measurement of measured cable 4 strain in the arbitrary experimental scale distance, guarantees that the test result is accurate. Therefore, the variable-gauge cable strain measurement method solves the problem that the length of the tested gauge length is variable due to different requirements of the diameter of the tested cable 4 and different test standards in the test of the tested cable 4, and effectively avoids the defects that a metal extension rod is large in size, complex in structure, inconvenient to install and poor in rigidity along with the increase of the length of the metal extension rod.

The method for measuring the strain of the cable with the variable gauge length can be used for measuring the strain of the cable 4 to be measured in the test process (such as creep test, stress-strain test and linear expansion coefficient test) of the cable 4 to be measured, and specifically comprises the following steps.

Step one, the tested cable 4 is installed in a tension system of a testing device, and an initial load is applied to the tested cable 4 through the tension system of the testing device, so that the tested cable 4 is in a straightening state.

And step two, selecting a haven pipe 5 matched with the diameter of the cable 4 to be measured, and respectively installing the haven pipe 5 in the wire clamp clamps 1 of the two groups of measuring assemblies.

And step three, clamping and fixing the wire clamp fixtures 1 of the two groups of measuring assemblies with the measured cable 4 respectively, enabling the distance between the two wire clamp fixtures 1 to be a required test gauge length, and preferably, installing and fixing the two wire clamp fixtures 1 at equal intervals on two sides of the midpoint of the measured cable 4. For better measurement of the elongation of the cable 4 under test in all directions, the two clamping devices 1 are preferably arranged at 90 °.

And step four, respectively installing two laser displacement sensors on the outer peripheries of the two wire clamp fixtures 1.

Fifthly, sleeving the baffles 2 of the two groups of measuring assemblies on the measured cable 4 between the two wire clamp fixtures 1, respectively positioning the two baffles 2 at positions close to the two wire clamp fixtures 1, respectively positioning the two baffles 2 in front of the laser displacement sensors on the two wire clamp fixtures 1, and adjusting the spacing distance between the baffles 2 and the wire clamp fixtures 1 to ensure that the baffles 2 are positioned in the optimal range of the laser displacement sensors; the installation and fixed height of the baffle 2 on the base 7 is adjusted to ensure that the axis of the through hole 20 on the baffle 2 coincides with the axis of the cable 4 to be measured.

And sixthly, applying a load to the tested cable 4 to a test load specified by the test of the tested cable 4 by a tension system of the test device, simultaneously setting the laser displacement sensors to be zero, setting the test frequency of the laser displacement sensors according to the test frequency specified by the test standard, starting the test, moving the two wire clamp fixtures 1 along with the extension of the tested cable 4 in the test process, respectively measuring the displacement of the two groups of wire clamp fixtures 1 relative to the baffle 2 according to the set test frequency by the laser displacement sensors on the two wire clamp fixtures 1, and recording the measured displacement and the corresponding time.

And seventhly, averaging the displacement measured by the two laser displacement sensors on each wire clamp fixture 1, and summing the average values of the two groups of measured values to obtain the total elongation of the measured cable 4 in the test gauge length, wherein the ratio of the total elongation to the test gauge length is the strain of the measured cable 4.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (9)

1. The utility model provides a variable gauge length cable strain measurement system, its characterized in that includes two sets of measuring component, every group the measuring component all includes fastener fixture (1), baffle (2) and displacement detection spare (3), fastener fixture (1) can be on surveyed cable (4) arbitrary position department with it is fixed to be surveyed cable (4) centre gripping, baffle (2) fixed set up and with fastener fixture (1) interval is relative, set up on baffle (2) and supply through-hole (20) that surveyed cable (4) pass through, displacement detection spare (3) are used for measuring fastener fixture (1) is relative the displacement volume of baffle (2).

2. The variable gauge length cable strain measurement system according to claim 1, wherein a haven tube (5) is detachably sleeved in the wire clamp fixture (1), and the inner diameter of the haven tube (5) is matched with the diameter of the measured cable (4).

3. The variable gauge cable strain measurement system of claim 2, wherein the clamp fixture (1) comprises an upper fixture half (1a) and a lower fixture half (1b) which are detachably butted, the centers of the upper fixture half (1a) and the lower fixture half (1b) are provided with fixture grooves, and the two fixture grooves are butted to form a mounting hole (10) for accommodating the haven tube (5).

4. The variable gauge length cable strain measurement system of claim 1, wherein the displacement detection member (3) is a laser displacement sensor mounted on the wire clamp fixture (1) and disposed opposite to the baffle (2) at a spacing.

5. The variable gauge length cable strain measurement system according to claim 4, wherein a plurality of laser displacement sensors are arranged on the wire clamp fixture (1), and the laser displacement sensors are arranged at equal intervals along the circumferential direction of the measured cable (4).

6. The variable gauge cable strain measurement system of claim 4, further comprising a data collector (6), wherein the laser displacement sensor is connected with the data collector (6).

7. Variable gauge cable strain measurement system according to claim 1, characterized in that the baffle (2) is elevationally mounted on a base (7) by means of a height adjustment device.

8. The variable gauge cable strain measurement system of claim 7, wherein the height adjustment device comprises a connecting rod (8) and an adjusting piece (9), one end of the connecting rod (8) is connected with the baffle (2), and the other end of the connecting rod is liftably mounted on the base (7) through the adjusting piece (9).

9. The variable gauge length cable strain measurement system according to claim 1, wherein the baffle (2) comprises an upper baffle half (2a) and a lower baffle half (2b) which are detachably butted, the centers of the upper baffle half (2a) and the lower baffle half (2b) are respectively provided with a baffle (2) groove, and the two baffle (2) grooves are butted to form the through hole (20) of the baffle (2).

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