Checking device of force transducer

Abstract

The utility model discloses a checking device of a force transducer, which relates to the technical field of checking of force transducers and comprises a base cylinder, a detection assembly and a loading mechanism. Wherein a checking cavity is formed in the base cylinder; the detection assembly comprises an elastic conductor, an input line and an output line, the elastic conductor is mounted in the checking cavity and is spaced from the bottom cavity wall of the checking cavity, a placement position for placing the force transducer is formed at the top of the elastic conductor, and the two ends of the elastic conductor are connected with the power supply through the input line and the output line respectively; the power supply, the elastic conductor, the input line and the output line form a detection loop; the loading mechanism comprises a loading sleeve, and a top plate of the loading sleeve is used for pushing the force transducer placed at the placing position so as to apply a downward load to the force transducer. The checking device of the force transducer can check the force transducer on a bridge support, is simple and convenient, and consumes less time.

Description

Technical Field

[0001] The utility model relates to the technical field of calibrating force measuring sensors, in particular to a calibrating device for force measuring sensors. Background Art

[0002] As an important component of the bridge structure, it is crucial to monitor the changes in the stress state of the bridge bearing in real time and dynamically. The force sensor is an important factor in achieving this goal. The performance of the force sensor is affected by the use environment and time. The degradation of the performance of the force sensor will cause errors in the measurement results. The accumulation of its measurement errors has a significant impact on the monitoring results.

[0003] Regular calibration of force sensors is an important measure to ensure accurate measurement results. At present, the calibration method for force sensors is usually to remove the bridge force sensor from the bridge support, then bring the force sensor to the laboratory, apply a load to the force sensor through a loading test machine, and calibrate the force sensor by comparing the load detected by the force sensor with the load applied by the loading test machine. The current calibration method requires removing the force sensor from the bridge support and bringing the force sensor back to the laboratory, which is cumbersome, inconvenient, and time-consuming. Utility Model Content

[0004] The main purpose of the utility model is to provide a calibration device for a force sensor, aiming to solve the technical problem that the calibration of the force sensor is complicated, inconvenient and time-consuming.

[0005] To achieve the above-mentioned purpose, the calibration device of the force sensor proposed in the utility model comprises: a base cylinder, wherein a calibration cavity is formed in the base cylinder, and a socket for inserting the force sensor into the calibration cavity is formed on the top of the base cylinder;

[0006] A detection component, the detection component comprising an elastic conductor, an input line and an output line, the elastic conductor being installed in the calibration cavity and spaced apart from the bottom cavity wall of the calibration cavity, a placement position for placing the force sensor being formed on the top of the elastic conductor, two ends of the elastic conductor being connected to a power source through the input line and the output line respectively, so that the power source, the elastic conductor, the input line and the output line form a detection loop;

[0007] The loading mechanism includes a loading sleeve, which is sleeved on the outside of the base cylinder and can be raised and lowered on the top of the base cylinder. The top of the loading sleeve has a top plate, and the bottom of the loading sleeve is open. The top plate is used to push the force sensor placed in the placement position to apply a downward load to the force sensor.

[0008] In one embodiment, an inner side wall of the loading sleeve is formed with an internal thread segment, and an outer side wall of the base sleeve is formed with an external thread segment, and the internal thread segment and the external thread segment are threadably matched.

[0009] In one embodiment, a positioning structure is disposed on the top of the conductor, and the positioning structure is used to position the force sensor at the placement position.

[0010] In one embodiment, the positioning structure includes a plurality of positioning members, which are installed on the top of the elastic conductor around the placement position and enclosed to form a positioning cavity, and the force sensor can be inserted into the positioning cavity. The plurality of positioning members are used to abut and cooperate with the force sensor inserted into the positioning cavity, so as to position the positioning members at the placement position.

[0011] In one embodiment, the two ends of the force sensor are respectively a contact end and a constraint end, the top plate is provided with a through hole for the contact end to extend upward, the placement position is used to place the contact end, the through hole is arranged corresponding to the placement position, and the top plate of the loading sleeve is used to push the contact end placed in the placement position to apply a downward load to the force sensor.

[0012] In one embodiment, the loading mechanism further includes a limiting structure, which is installed below the top plate and is used to abut and cooperate with the contact end to limit the force sensor.

[0013] In one embodiment, the limiting structure includes a plurality of limiting blocks, which are arranged around the through hole at intervals below the top plate and enclosed to form a limiting cavity, and the force sensor can extend into the limiting cavity. The plurality of limiting blocks are used to abut and cooperate with the outer side of the contact end extending into the limiting cavity to limit the contact end, and the top plate is used to push the plurality of limiting blocks downward, and push the constraint end placed in the placement position downward through the plurality of limiting blocks to apply a downward load to the force sensor.

[0014] In one embodiment, the power source is disposed in the base cylinder.

[0015] In one embodiment, the power supply includes a battery and a switch, and the battery and the switch are installed on the base tube. The two ends of the elastic conductor are connected to the battery through the input line and the output line respectively. The switch is set on the output line or the input line, and the switch is used to turn on and off the detection circuit.

[0016] In one embodiment, the detection component further includes an ammeter, and the ammeter is arranged on the output line or the input line.

[0017] The technical solution of the utility model is to provide a base tube, in which a calibration cavity is formed, in which an elastic conductor, an input line and an output line are arranged, and a loading sleeve is also arranged on the top of the base tube. When it is necessary to calibrate the force sensor, the calibration device of the force sensor of the utility model can be placed on the bridge support, and the force sensor of the bridge support is inserted into the calibration cavity from the socket and placed in the placement position on the elastic conductor. By pushing the force sensor placed in the placement position downward through the loading sleeve, a downward load can be applied to the force sensor, and the first load value can be measured by the force sensor, and the current in the detection circuit can be measured to obtain the current value in the detection circuit. Since the load acting on the force sensor is transferred to the elastic conductor, the elastic conductor will be deformed under the action of the downward load, resulting in a change in the resistance of the elastic conductor.

[0018] Therefore, by placing the force sensor on the elastic conductor in the force sensor of the utility model, and applying a downward load to the force sensor through the loading mechanism, the current value in the detection circuit is obtained at the same time, and the reading on the force sensor is read to obtain the second load value, the second load value can be calculated according to the current value, and the calculated second load value can be regarded as the load value of the force sensor. The force sensor can be calibrated by comparing the first load value and the second load value. The calibration device of the force sensor of the utility model can be used to calibrate the force sensor on the bridge support, without the need to remove the force sensor from the bridge support and take it to the laboratory for calibration, which is simple, convenient and time-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 A structural schematic diagram of an embodiment of a calibration device for a force sensor provided by the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the middle base tube;

[0022] Figure 3 for Figure 1 A schematic diagram of the structure of the middle base tube at another viewing angle;

[0023] Figure 4 for Figure 1 Schematic diagram of the structure of the loading mechanism;

[0024] Figure 5 for Figure 1 Schematic diagram of top view of the loading mechanism:

[0025] Figure 6 A schematic diagram of a detection circuit in an embodiment of a calibration device for a force sensor provided by the utility model;

[0026] Figure 7 A structural schematic diagram of a force sensor in an embodiment of a calibration device for a force sensor provided by the utility model;

[0027] Figure 8 This is a schematic diagram of the first formula in an embodiment of the calibration device of the force sensor provided by the utility model.

[0028] Description of Figure Numbers:

[0029] 100. Calibration device; 10. Base cylinder; 11. Calibration cavity; 12. Socket; 13. Internal thread section; 20. Detection component; 21. Elastic conductor; 22. Input line; 23. Output line; 24. Placement position; 30. Loading mechanism; 31. Loading sleeve; 311. Top plate; 312. External thread section; 313. Through hole; 40. Power supply; 50. Positioning structure; 51. Positioning piece; 52. Positioning cavity; 60. Limiting structure; 61. Limiting block; 62. Limiting cavity; 70. Ammeter; 80. Detection circuit; 200. Force sensor; 201. Contact end; 202. Constraint end.

[0030] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0034] The utility model provides a calibration device for a force sensor.

[0035] See also Figures 1 to 8 In one embodiment of the utility model, the calibration device 100 of the force sensor 200 includes a base tube 10, a detection assembly 20 and a loading mechanism 30; wherein a calibration cavity 11 is formed in the base tube 10, and a socket 12 for inserting the force sensor 200 into the calibration cavity 11 is formed on the top of the base tube 10; the detection assembly 20 includes an elastic conductor 21, an input line 22 and an output line 23, the elastic conductor 21 is installed in the calibration cavity 11 and is spaced from the bottom cavity wall of the calibration cavity 11, and a placement position 24 for placing the force sensor 200 is formed on the top of the elastic conductor 21 The two ends of the elastic conductor 21 are connected to the power supply 40 through the input line 22 and the output line 23 respectively, so that the power supply 40, the elastic conductor 21, the input line 22 and the output line 23 form a detection circuit 80; the loading mechanism 30 includes a loading sleeve 31, the loading sleeve 31 is sleeved on the outside of the base cylinder 10, and can be raised and lowered on the top of the base cylinder 10, the top of the loading sleeve 31 has a top plate 311, the bottom of the loading sleeve 31 is open, and the top plate 311 is used to push the force sensor 200 placed in the placement position 24 to apply a downward load to the force sensor 200.

[0036] The technical solution of the utility model is to provide a base tube 10, in which a calibration cavity 11 is formed, in which an elastic conductor 21, an input line 22 and an output line 23 are arranged, and a loading sleeve 31 is also arranged on the top of the base tube 10. When it is necessary to calibrate the force sensor 200, the calibration device 100 of the force sensor 200 of the utility model can be placed on the bridge support, and the force sensor 200 of the bridge support is inserted into the calibration cavity 11 from the socket 12 and placed in the placement position 24 on the elastic conductor 21. The force sensor 200 placed in the placement position 24 is pushed downward by the loading sleeve 31, so that a downward load can be applied to the force sensor 200, and the first load value can be measured by the force sensor 200, and the current in the detection circuit 80 is measured, and the current value in the detection circuit 80 can be obtained. Since the load acting on the force sensor 200 is transferred to the elastic conductor 21 , the elastic conductor 21 will be deformed under the action of the downward load, resulting in a change in the resistance of the elastic conductor 21 .

[0037] Therefore, by placing the force sensor 200 on the elastic conductor 21 in the force sensor 200 of the utility model, and applying a downward load to the force sensor 200 through the loading mechanism 30, the current value in the detection circuit 80 is obtained at the same time, and the reading on the force sensor 200 is read to obtain the second load value, the second load value can be calculated according to the current value, and the calculated second load value can be regarded as the load value of the force sensor 200. The force sensor 200 can be calibrated by comparing the first load value and the second load value. The calibration device 100 of the force sensor 200 of the utility model can be used to calibrate the force sensor 200 on the bridge support, without the need to remove the force sensor 200 from the bridge support and take it to the laboratory for calibration, which is simple, convenient and time-saving.

[0038] It can be understood that the loading sleeve 31 is arranged on the top of the base tube 10 and is sleeved on the outside of the base tube 10. The elastic conductor 21, the input line 22 and the output line 23 are all arranged in the calibration cavity 11 of the base tube 10. The base tube 10 and the loading sleeve 31 together form a protective structure. The protective structure can provide protection for the elastic conductor 21, the input line 22 and the output line 23 in the calibration cavity 11, and the reliability of use is higher.

[0039] In one embodiment of the present invention, an inner wall of the loading sleeve 31 is formed with an internal thread section 13 , and an outer wall of the base tube 10 is formed with an external thread section 312 , and the internal thread section 13 and the external thread section 312 are threadably matched.

[0040] Specifically, Figures 2 to 4As shown, the inner wall of the loading sleeve 31 is formed with an internal thread section 13, and the outer wall of the sleeve is formed with an external thread section 312. The internal thread section 13 and the external thread section 312 are threadedly matched. When it is necessary to apply a downward load to the force sensor 200 placed in the placement position 24, it is only necessary to rotate the loading sleeve 31, and the loading sleeve 31 can continuously apply a downward load to the force sensor 200. The operation is simple and convenient, and the load application is stable and reliable.

[0041] In an embodiment of the present invention, a positioning structure 50 is disposed on the top of the conductor, and the positioning structure 50 is used to position the force sensor 200 at the placement position 24 .

[0042] Specifically, as shown in the figure, a positioning structure 50 is provided on the top of the conductor, and the force sensor 200 can be quickly positioned at the placement position 24 through the positioning structure 50, which is simple and convenient.

[0043] In one embodiment of the utility model, the positioning structure 50 includes a plurality of positioning members 51, which are installed on the top of the elastic conductor 21 around the placement position 24 and enclose a positioning cavity 52. ​​The force sensor 200 can be inserted into the positioning cavity 52. ​​The plurality of positioning members 51 are used to abut and cooperate with the force sensor 200 inserted into the positioning cavity 52 to position the positioning member 51 at the placement position 24.

[0044] Specifically, Figure 2 and Figure 3 As shown, a plurality of positioning members 51 are installed around the placement position 24 on the top of the elastic conductor 21, and the plurality of positioning members 51 enclose a positioning cavity 52. ​​When the force sensor 200 needs to be placed in the placement position 24, the force sensor 200 extends into the positioning cavity 52, and the plurality of positioning members 51 abut against and cooperate with the force sensor 200, so that the force sensor 200 can be positioned in the placement position 24. The structure is simple and reliable, and positioning is convenient.

[0045] In one embodiment of the utility model, the two ends of the force sensor 200 are respectively a contact end 201 and a constraint end 202, the top plate 311 is provided with a through hole 313 for the contact end 201 to extend upward, the placement position 24 is used to place the contact end 201, the through hole 313 is arranged corresponding to the placement position 24, and the top plate 311 of the loading sleeve 31 is used to push the contact end 201 placed in the placement position 24 to apply a downward load to the force sensor 200.

[0046] Specifically, Figure 4 , Figure 5 and Figure 7As shown, the bottom and top of the force sensor 200 are the constraint end 202 and the contact end 201 respectively. The constraint end 202 is placed in the placement position 24. Multiple positioning members 51 abut against the constraint end 202 to limit the constraint end 202 in the placement position 24. The top plate 311 is provided with a through hole 313. The through hole 313 allows the contact end 201 of the force sensor 200 to extend upward, which can prevent the force sensor 200 from being too long to be placed between the loading sleeve 31 and the base cylinder 10. The structure is reasonable and the applicability is strong.

[0047] In an embodiment of the present invention, the loading mechanism 30 further includes a limiting structure 60 , which is installed below the top plate 311 . The limiting structure 60 is used to abut against the contact end 201 to limit the force sensor 200 .

[0048] Specifically, Figure 4 and Figure 5 As shown, a limiting structure 60 is provided at the bottom of the top plate 311. The limiting structure 60 can provide further limiting for the force sensor 200 inserted into the calibration cavity 11, and can effectively prevent the force sensor 200 from shaking when subjected to a downward load, thereby providing higher stability and reliability.

[0049] In one embodiment of the utility model, the limiting structure 60 includes a plurality of limiting blocks 61, and the plurality of limiting blocks 61 are arranged around the through hole 313 at intervals below the top plate 311 and enclose a limiting cavity 62. The force sensor 200 can extend into the limiting cavity 62, and the plurality of limiting blocks 61 are used to abut and cooperate with the outer side of the contact end 201 extending into the limiting cavity 62 to limit the contact end 201, and the top plate 311 is used to push the plurality of limiting blocks 61 downward, and push the constraint end 202 placed in the placement position 24 downward through the plurality of limiting blocks 61 to apply a downward load to the force sensor 200.

[0050] Specifically, Figure 4 and Figure 5 As shown, a plurality of limit blocks 61 are arranged below the top plate 311, and the plurality of limit blocks 61 are arranged at intervals around the through hole 313 to form a limit cavity 62. The force sensor 200 is extended into the limit cavity 62, and the plurality of limit blocks 61 abut against the contact end 201 of the force sensor 200, so that the contact end 201 can be limited. The structure is simple, stable and reliable. Thus, the force sensor 200 is limited, and the plurality of limit blocks 61 are pushed downward by the top plate 311, so that the plurality of limit blocks 61 push the constraint end 202 downward, thereby applying a downward load to the force sensor 200, and the operation is convenient.

[0051] In an embodiment of the present invention, the power source 40 is disposed on the base cylinder 10 .

[0052] Specifically, the power source 40 is disposed in the base tube 10 , which has a compact structure and is convenient for transportation.

[0053] In one embodiment of the utility model, the power supply 40 includes a battery and a switch, which are installed on the base tube 10. The two ends of the elastic conductor 21 are connected to the battery through an input line 22 and an output line 23 respectively. The switch is set on the output line 23 or the input line 22, and the switch is used to open and close the detection circuit 80.

[0054] Specifically, the power supply 40 includes a battery and a switch, which are installed on a base with a compact structure. The on / off of the detection circuit 80 can be controlled by the switch. When it is necessary to calibrate the force sensor 200, the detection circuit 80 is connected by the switch. When it is not necessary to calibrate the force sensor 200, the detection circuit 80 is disconnected by the switch. This can effectively save electric energy and is safer.

[0055] In an embodiment of the present invention, the detection component 20 further includes an ammeter 70 , and the ammeter 70 is disposed on the output line 23 or the input line 22 .

[0056] Specifically, the current value in the detection loop 80 can be obtained more conveniently through the ammeter 70, which is simple, convenient, clear and intuitive.

[0057] More specifically, by placing the force sensor 200 on the elastic conductor 21 in the force sensor 200 of the utility model, and applying a downward load to the force sensor 200 through the loading mechanism 30, the current value in the detection circuit 80 is obtained at the same time, and the reading on the force sensor 200 is read to obtain the second load value, the second load value can be calculated according to the current value, the current value is substituted into the first formula, and the second load value is obtained according to the first formula; wherein the first formula is: i is the current value, F is the second load value, and a and b are constants. The curve diagram of the first formula is shown in Figure 8 , b is Figure 8 The slope of the curve.

[0058] By comparing the first load value and the second load value, the ratio of the first load value to the second load value is obtained, thereby obtaining the calibration coefficient c; the first load value is substituted into the second formula F1=c*F to complete the calibration of the force sensor 200, and obtain the calibration load after calibration, which is simple and convenient. The calibration device 100 of the force sensor 200 of the utility model can be used to calibrate the force sensor 200 on the bridge support, without removing the force sensor 200 from the bridge support and taking it to the laboratory for calibration, which is simple, convenient and time-saving.

[0059] Further, the second load value is F, the current value of the detection loop 80 is i, the elastic modulus of the elastic conductor 21 is E, the length of the elastic conductor 21 is L, the resistance per unit length of the elastic conductor 21 is r, the deflection of the elastic conductor 21 is y, the voltage of the power supply 40 is U, the resistance of the input line 22 is R1, and the resistance of the output line 23 is R2;

[0060] The calculation formula for y is

[0061] Substituting y into the formula

[0062] Available formulas

[0063] coefficient coefficient

[0064] The first formula can be derived as

[0065] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A calibration device for a force sensor, characterized in that: The force sensor is used to monitor the stress state of the bridge support, and the verification device includes: A base cylinder, wherein a calibration cavity is formed in the base cylinder, and a socket for inserting the force sensor into the calibration cavity is formed at the top of the base cylinder; A detection component, the detection component comprising an elastic conductor, an input line and an output line, the elastic conductor being installed in the calibration cavity and spaced apart from the bottom cavity wall of the calibration cavity, a placement position for placing the force sensor being formed on the top of the elastic conductor, two ends of the elastic conductor being connected to a power source through the input line and the output line respectively, so that the power source, the elastic conductor, the input line and the output line form a detection loop; The loading mechanism includes a loading sleeve, which is sleeved on the outside of the base cylinder and can be raised and lowered on the top of the base cylinder. The top of the loading sleeve has a top plate, and the bottom of the loading sleeve is open. The top plate is used to push the force sensor placed in the placement position to apply a downward load to the force sensor.

2. The calibration device for a force sensor according to claim 1, characterized in that: An inner side wall of the loading sleeve is formed with an internal thread section, and an outer side wall of the base sleeve is formed with an external thread section, and the internal thread section and the external thread section are threadably matched.

3. The calibration device for a force sensor according to claim 1, characterized in that: A positioning structure is provided on the top of the conductor, and the positioning structure is used to position the force sensor at the placement position.

4. The calibration device for a force sensor according to claim 3, characterized in that: The positioning structure includes a plurality of positioning members, which are installed on the top of the elastic conductor around the placement position and enclose a positioning cavity. The force sensor can extend into the positioning cavity. The plurality of positioning members are used to abut and cooperate with the force sensor extended into the positioning cavity to position the positioning member at the placement position.

5. The calibration device for a force sensor according to claim 1, characterized in that: The two ends of the force sensor are respectively a contact end and a constraint end. The top plate is provided with a through hole for the contact end to extend upward. The placement position is used to place the contact end. The through hole is arranged corresponding to the placement position. The top plate of the loading sleeve is used to push the contact end placed in the placement position to apply a downward load to the force sensor.

6. The calibration device for a force sensor according to claim 5, characterized in that: The loading mechanism further comprises a limiting structure, which is installed below the top plate and is used to abut and cooperate with the contact end to limit the force sensor.

7. The calibration device for a force sensor according to claim 6, characterized in that: The limiting structure includes a plurality of limiting blocks, which are arranged around the through hole at intervals below the top plate and enclose a limiting cavity. The force sensor can extend into the limiting cavity. The plurality of limiting blocks are used to abut and cooperate with the outer side of the contact end extending into the limiting cavity to limit the contact end, and the top plate is used to push the plurality of limiting blocks downward, and push the constraint end placed in the placement position downward through the plurality of limiting blocks to apply a downward load to the force sensor.

8. The calibration device for a force sensor according to any one of claims 1 to 7, characterized in that: The power source is arranged on the base cylinder.

9. The calibration device for a force sensor according to claim 8, characterized in that: The power source includes a battery and a switch, which are installed on the base tube. The two ends of the elastic conductor are connected to the battery through the input line and the output line respectively. The switch is set on the output line or the input line, and the switch is used to turn on and off the detection circuit.

10. The calibration device for a force sensor according to any one of claims 1 to 7, characterized in that: The detection component further includes an ammeter, and the ammeter is arranged on the output line or the input line.

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