CN113804353B - Automatic calibration equipment and calibration method for force sensor - Google Patents
Automatic calibration equipment and calibration method for force sensor Download PDFInfo
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- CN113804353B CN113804353B CN202110973920.1A CN202110973920A CN113804353B CN 113804353 B CN113804353 B CN 113804353B CN 202110973920 A CN202110973920 A CN 202110973920A CN 113804353 B CN113804353 B CN 113804353B
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- 230000007246 mechanism Effects 0.000 claims abstract description 98
- 238000012360 testing method Methods 0.000 claims abstract description 52
- 238000000429 assembly Methods 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
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- 230000008859 change Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses automatic calibration equipment for a force sensor, which comprises a frame, a moving device and a calibration mechanism for calibration, wherein the moving device comprises a moving test mechanism and a driving mechanism for driving the moving test mechanism to move, the force sensor is arranged on the moving test mechanism, and the moving test mechanism comprises a force measuring arm; the calibration mechanism comprises a weight assembly and a connecting rope for connecting the weight assembly with the force measuring arm, and the force measuring arm is used for being connected with the connecting rope and driving the weight assembly to move. According to the automatic calibration equipment for the force sensor, the driving mechanism is arranged to drive the movable testing mechanism to move, the force measuring arm is driven to move, the weight component is automatically lifted, and the calibration of the force sensor is realized by comparing the measured actual value with the theoretical value; and the flexible connection mode formed by combining the guide rail and the buffer component is adopted between the movable frame and the movable test mechanism, so that the buffer effect can be effectively achieved.
Description
Technical Field
The invention belongs to the technical field of calibration equipment, and particularly relates to automatic calibration equipment for a force sensor and a calibration method for calibrating the force sensor by adopting the automatic calibration equipment.
Background
In the assembly production of the sliding rail, as the requirements of the automobile industry on the safety and comfort of the seat sliding rail are higher and higher, the sliding force of the seat on the sliding rail should be moderate, the movement is uniform and stable, and all products need to be accurately tested for the sliding force. The slide rail suppliers have strict standards for slide rail sliding force testing, including the speed of the sliding force testing, the magnitude of the sliding force, the testing accuracy, etc. The sliding force testing range of the common sliding rail is 30-50N, and the testing range of the sliding force of the high-end product is more severe.
Due to the rapid development of the automotive industry, the production and testing of the slide rail is also increasing, the production time of the slide rail is generally 10-15 seconds, some manufacturers have increased to 5.5 seconds, and such high yields require equipment suppliers to reduce the auxiliary time of equipment production.
In the sliding force test of the sliding rail, in order to compensate the measurement error of the pulling and pressing type sensor and improve the measurement precision, the sensor must be calibrated regularly to improve the system precision of the equipment. The calibration of the sensor is to establish the relation between the input quantity and the output quantity of the sensor through experiments, determine the error relation under different use conditions, calibrate and compensate the sensor through a software or program processing mode, and ensure the actual measurement accuracy of the sensor. The calibration of the prior sensor is carried out in a manual mode, so that the time is long, and the actual calibration precision and effect are affected by the skill and proficiency of manual operation. Because the actual production has the requirements on the equipment efficiency and the measurement precision, the calibration time of the sensor must be shortened, and errors caused by human factors are eliminated, a set of automatic calibration mechanical mechanism and system are needed to be developed to replace manual calibration, and the problems of long time, low efficiency and poor precision of the traditional manual calibration are solved.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art, an object of the present invention is to provide an automatic calibration device for a force sensor, which can realize automatic calibration of the force sensor.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the automatic calibration equipment for the force sensor comprises a frame, a moving device and a calibration mechanism for calibration, wherein the moving device comprises a moving test mechanism and a driving mechanism for driving the moving test mechanism to move, the force sensor is arranged on the moving test mechanism, and the moving test mechanism comprises a force measuring arm; the calibration mechanism comprises a weight assembly and a connecting rope for connecting the weight assembly with the force measuring arm, and the force measuring arm is used for being connected with the connecting rope and driving the weight assembly to move.
The driving mechanism is arranged to drive the movable testing mechanism to move, the force measuring arm is driven to move, the weight component is further lifted, and the calibration of the force sensor is realized by comparing the measured actual value with the theoretical value.
According to some preferred embodiments of the invention, the weight assembly comprises a weight assembly comprising a mount and a weight disposed within the mount; the fixing frame comprises a plurality of supporting plates, and the weights comprise a plurality of weights which are arranged corresponding to the supporting plates. The weights are weights with preset weights and have corresponding theoretical values, the corresponding weights are lifted through the force measuring arms, the force sensors obtain corresponding measured values, the measured actual values are compared with the theoretical values corresponding to the weights, and then the sensors are calibrated.
In some embodiments, the mount includes a first support plate, a second support plate, and a third support plate, and the weights include a first weight, a second weight, and a third weight disposed corresponding to the support plates. When the calibration of the force sensor is carried out, the first weight, the second weight and the third weight are sequentially lifted, so that the weights are separated from the corresponding supporting plates, and further the actual measurement value of the weights is obtained.
According to some preferred embodiments of the invention, the weight assembly is provided on a side of the frame on which the idler wheel is provided; one end of the connecting rope penetrates through the idler wheel and then is connected with the weight assembly. The idler wheel is used for guiding the connecting rope and changing the direction of the connecting rope, namely changing the direction of force between the force in the vertical direction of the lifting weight and the force in the horizontal direction of the pulling force measuring arm. The connecting rope is preferably a flexible steel wire rope. When the force sensor is calibrated, one end of the connecting rope between the idler wheel and the force measuring arm is always kept in a horizontal state.
In some embodiments of the invention, calibration mechanisms are arranged on the left side and the right side of the frame to calibrate the pulling pressure of the force sensor, so that the calibration result is more accurate.
According to some preferred embodiments of the present invention, the movement testing mechanism comprises a fixed plate, a moving plate slidably arranged on the fixed plate, and a vertical driving assembly for driving the moving plate to move relative to the fixed plate, the force measuring arm is rotatably connected with the moving plate, and the force sensor is arranged between the force measuring arm and the fixed plate. The fixed plate is used for connecting the movable testing mechanism with the driving mechanism, the vertical driving assembly is used for driving the movable plate to move so as to drive the force measuring arm to move, so that the force measuring arm moves downwards to be connected with the connecting rope when calibration is needed, and one end of the connecting rope is kept horizontal; and when the calibration is not needed, the force measuring arm is driven to move upwards.
According to some preferred embodiments of the present invention, a first rotary joint is disposed between the upper section of the force measuring arm and the moving plate, a second rotary joint is disposed at the middle section of the force measuring arm, a third rotary joint is disposed on the moving plate, and the force sensor is disposed between the second rotary joint and the third rotary joint. The second revolute joint and the third revolute joint are located on the same horizontal plane.
In some embodiments of the present invention, a guide rail is disposed between the moving plate and the fixed plate, and the moving plate is moved, limited and guided by the guide rail. Limiting blocks are arranged on the moving plate, limiting blocks are arranged above and below the corresponding limiting blocks on the fixed plate, and buffer pieces are arranged on the limiting blocks. The guide groove is formed in the outer side of the force measuring arm, the guide block is arranged on the top end of the fixing plate and used for guiding the up-and-down movement of the force measuring arm, and the force measuring arm is withdrawn from the guide groove when being tested or calibrated, so that blocking is avoided.
According to some preferred embodiments of the invention, the driving mechanism comprises a moving frame for fixing the moving test mechanism, a horizontal driving assembly for driving the moving frame to move in a horizontal direction, and the fixing plate is fixedly mounted on the moving frame. The horizontal driving assembly comprises a screw rod and a motor for driving the screw rod to rotate, and the moving frame moves under the driving of the screw rod. A guide rail is preferably provided below the moving frame to guide the movement of the moving frame.
According to some preferred embodiments of the present invention, the buffer assembly includes a buffer assembly disposed between the moving frame and the fixed plate, the top of the moving frame is provided with a stopper, the top of the fixed plate is provided with a buffer portion, the buffer assembly includes a buffer such as a cylinder, and a buffer block disposed at an end of an output shaft of the buffer, a portion of the buffer block is in contact with the buffer portion, and the remaining portion of the buffer block is in contact with the stopper. The movable frame and the fixed plate are not rigidly connected, and collision can be generated at the movement end point when the screw rod rotates to drive the movable frame and the movable testing mechanism to move, so that related parts are easy to damage. In some embodiments of the invention, the movable frame and the fixed plate are in a flexible connection mode formed by combining the guide rail and the buffer component, so that the buffer component can effectively play a role in buffering in the moving process of the movable frame, the movable frame is ensured to effectively move, meanwhile, the damage to related parts is avoided, and the service life of the parts is effectively prolonged.
According to some preferred embodiments of the present invention, the rack is provided with a slide fixing mechanism, the slide includes an upper slide, a lower slide, and a fixing clip for fixing a relative position between the upper slide and the lower slide, and the lower end of the moving plate is provided with an unlocking component for unlocking the fixing clip so that the upper slide and the lower slide are in a relatively free sliding state. The lower extreme of dynamometry arm is provided with the bolt, the bolt is used for fixing the position between the dynamometry arm and the last slide rail and is used for connecting the one end of connecting the rope. In some embodiments of the invention, the lower end of the force measuring arm is provided with a concave rectangular hole, and the bolt is provided with a limiting ring matched with the rectangular hole so as to avoid rotation of the bolt. Meanwhile, in order to hook the end part of the connecting rope, the connecting rope is prevented from falling off in the calibration process, and the bolt is also provided with an annular groove to hook the connecting rope.
In some embodiments of the present invention, the unlocking assembly includes an unlocking plate that moves downward and presses down the fixing clip simultaneously when the moving plate moves downward, thereby unlocking the fixing clip, so that the upper slide rail and the lower slide rail can slide relatively freely.
According to some preferred embodiments of the present invention, the slide fixing mechanism is used for fixing the lower slide rail, and the slide fixing mechanism includes a fixing block located below the slide rail and clamping assemblies located at two sides of the length direction of the lower slide rail; the clamping assembly is used for limiting horizontal displacement in the length direction of the lower sliding rail; the fixed block comprises a first fixed block and/or a second fixed block, the first fixed block is provided with a containing groove, the lower sliding rail is contained in the containing groove, the top of the second fixed block is provided with a fixing pin, and the fixing pin is used for being inserted into the lower sliding rail to fix the relative position of the lower sliding rail and the second fixed block. The clamping assembly comprises a tightening block and a driver for driving the tightening block to move relative to the sliding rail. The abutting block and the lower sliding rail are located on the same horizontal plane.
The invention also provides a calibration method of the force sensor according to the automatic calibration equipment of the force sensor, which comprises the following steps:
The connecting rope is connected with the force measuring arm and the weight component, the force measuring arm is driven by the driving mechanism to move and the weight component is driven to move, and the actual numerical value of the force sensor is recorded; and calibrating the force sensor by comparing the actual value with the theoretical value of the force sensor.
Specifically, in some embodiments of the present invention, the calibration method includes the following steps:
The driving mechanism drives the movable testing mechanism to move to a proper position in the horizontal direction, and the vertical driving assembly drives the movable plate to further drive the force measuring arm to descend to a corresponding height, wherein the position is an initial position;
one end of the connecting rope is sleeved on a bolt at the lower end of the force measuring arm, and the other end of the connecting rope is connected with the weight assembly;
Starting a calibration program: the driving mechanism drives the movable testing mechanism to slowly move to a first position to drive the first weight to separate from the first supporting plate, and the actual numerical value of the force sensor at the moment is recorded;
the driving mechanism drives the movable testing mechanism to slowly move to a second position to drive the second weight to separate from the second supporting plate, and the actual numerical value of the force sensor at the moment is recorded;
The driving mechanism drives the movable testing mechanism to slowly move to a third position to drive a third weight to separate from a third supporting plate, and the actual numerical value of the force sensor at the moment is recorded;
The driving mechanism drives the movable testing mechanism to slowly move to an initial position and drives the three weights to be replaced on the corresponding supporting plates;
The connecting rope is taken down from the bolt, the connecting rope on the calibrating mechanism on the other side is connected to the bolt below the force measuring arm, and the steps are repeated;
Calibrating and compensating the sensor according to the actual numerical value and theoretical data of the left and right calibrating mechanisms; and (5) finishing the calibration of the force sensor.
Compared with the prior art, the invention has the following advantages: according to the automatic calibration equipment for the force sensor, the driving mechanism is arranged to drive the movable testing mechanism to move, the force measuring arm is driven to move, the weight component is automatically lifted, and the calibration of the force sensor is realized by comparing the measured actual value with the theoretical value; and adopt the flexible connection form that guide rail and buffer module combination formed between movable frame and the removal test mechanism, can effectively play the cushioning effect, effectively prolong the life of part.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of a first view of an automatic calibration device for a force sensor in accordance with an embodiment of the present invention;
FIG. 2 is a perspective view of a second view of an automatic calibration device for force sensors in accordance with an embodiment of the present invention;
FIG. 3 is a front view of an automatic calibration device for a force sensor in an embodiment of the present invention;
FIG. 4 is a front view of a mobile test mechanism and a slide rail securing mechanism in an embodiment of the present invention;
FIG. 5 is a perspective view of a mobile test mechanism and a slide rail securing mechanism according to an embodiment of the present invention;
FIG. 6 is a perspective view of a calibration mechanism according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a calibration mechanism according to an embodiment of the present invention;
FIG. 8 is a perspective view of a latch according to an embodiment of the present invention;
In the drawing, a frame-1, a moving device-2, a moving test mechanism-3, a fixed plate-31, a moving plate-32, a vertical driving component-33, a measuring arm-34, a guide groove-341, a rectangular hole-342, a bolt-343, a limiting ring-344, a groove-345, a first rotating joint-351, a second rotating joint-352, a third rotating joint-353, a guide block-36, a limiting block-371, a limiting stop-372 and a buffer piece-373; the device comprises a driving mechanism-4, a movable frame-41, a horizontal driving component-42, a screw rod-421 and a motor-422; the device comprises a calibration mechanism-5, a weight assembly-51, a fixing frame-511, a first support plate-5111, a second support plate-5112, a third support plate-5113, a first weight-5121, a second weight-5122, a third weight-5123, a connecting rope-52 and an idler wheel-53; the device comprises a buffer assembly-6, a stop block-61, a buffer part-62, a buffer-63 and a buffer block-64; the slide rail fixing mechanism-7, the first fixing block-71 and the second fixing block-72; a clamping assembly-8, a tightening block-81, a driver-82; an upper slide rail-91, a lower slide rail-92 and a fixing clamp-93; an unlocking component-10, an unlocking plate-101; guide rail-11, force sensor-12.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1 force sensor automatic calibration apparatus
Referring to fig. 1-8, the automatic calibration device for the force sensor 12 in the present embodiment includes a frame 1, a slide fixing mechanism 7 disposed on the frame 1, a moving device 2, and a calibration mechanism 5 for performing calibration, the moving device 2 includes a movement testing mechanism 3, and a driving mechanism 4 for driving the movement testing mechanism 3 to move, and the force sensor 12 is disposed on the movement testing mechanism 3. The following details the individual components:
As shown in fig. 4 to 5, the movement testing mechanism 3 includes a fixed plate 31, a moving plate 32 slidably disposed on the fixed plate 31, a force measuring arm 34 disposed on the moving plate 32, and a vertical driving assembly 33 for driving the moving plate 32 to move relative to the fixed plate 31, the force measuring arm 34 is rotatably connected with the moving plate 32, and the force sensor 12 is disposed between the force measuring arm 34 and the fixed plate 31. The fixed plate 31 is used for connecting the movable testing mechanism 3 with the driving mechanism 4, the vertical driving component 33 is used for driving the movable plate 32 to move, and then driving the force measuring arm 34 to move vertically, so that the force measuring arm 34 is moved downwards to be connected with the connecting rope 52 when calibration is needed, and one end of the connecting rope 52 is ensured to be kept horizontal; the arm 34 is moved upward when calibration is not required.
A first rotary joint 351 is arranged between the upper section of the force measuring arm 34 and the moving plate 32, a second rotary joint 352 is arranged at the middle section of the force measuring arm 34, a third rotary joint 353 is arranged on the moving plate 32, and the force sensor 12 is arranged between the second rotary joint 352 and the third rotary joint 353. The second revolute joint 352 and the third revolute joint 353 are located on the same horizontal plane.
Limiting blocks 371 are arranged on the moving plate 32, limiting stops 61372 are arranged on the fixed plate 31, corresponding to the upper side and the lower side of the limiting blocks 371, and buffer members 373 are arranged on the limiting stops 61372. The outer side of the force measuring arm 34 is provided with a guide groove 341, the top end of the fixing plate 31 is provided with a guide block 36, and the guide block 36 is used for guiding the up-and-down movement of the force measuring arm 34 and is withdrawn from the guide groove 341 when the force measuring arm 34 is tested or calibrated so as to avoid blocking. The lower end side of the guide block 36 is inclined to facilitate insertion into the guide groove 341.
The driving mechanism 4 includes a moving frame 41 for fixing the moving test mechanism 3, a horizontal driving assembly 42 for driving the moving frame 41 to move in the horizontal direction, and the fixing plate 31 is fixedly mounted on the moving frame 41. The horizontal driving assembly 42 includes a screw 421 and a motor 422 for driving the screw 421 to rotate, and the moving frame 41 is driven by the motor 422 and the screw 421 to move.
As shown in fig. 4 to 5, in this embodiment, a buffer assembly 6 is further provided between the movable frame 41 and the fixed plate 31, a stopper 61 is provided at the top of the movable frame 41, a buffer portion 62 is provided at the top of the fixed plate 31, the buffer assembly 6 includes a buffer 63 such as a cylinder and a buffer block 64 provided at an output shaft end portion of the buffer 63, a part of the buffer block 64 is in contact with the buffer portion 62, and the remaining part of the buffer block 64 is in contact with the stopper 61. In the embodiment, the movable frame and the fixed plate are in a flexible connection mode formed by combining the guide rail and the buffer component, the buffer effect can be effectively achieved through the arrangement of the buffer component in the moving process of the movable frame, the movable frame is ensured to effectively move, meanwhile, damage to related parts is avoided, and the service life of the parts is effectively prolonged. In this embodiment, half of the buffer block 64 is in contact with the buffer portion 62, and the other half is in contact with the stopper 61.
As shown in fig. 1-3 and 6-7, the calibration mechanism 5 includes a weight assembly and a connecting rope 52 connecting the weight assembly and the force measuring arm 34, and the force measuring arm 34 is used for connecting with the connecting rope 52 and driving the weight assembly to move. Calibration mechanisms 5 are arranged on the left side and the right side of the frame 1 to calibrate the pulling pressure of the force sensor 12, so that the calibration result is more accurate.
The weight assembly comprises a weight assembly 51, wherein the weight assembly 51 comprises a fixing frame 511 and weights arranged in the fixing frame 511; the fixing frame 511 comprises a plurality of support plates, and the weights comprise a plurality of weights corresponding to the support plates. The weights are weights with preset weights and have corresponding theoretical values, the corresponding weights are lifted through the measuring arm 34, the force sensor 12 obtains corresponding measured values, the measured actual values are compared with the theoretical values corresponding to the weights, and the sensor is calibrated.
As shown in fig. 6 to 7, the fixing frame 511 in this embodiment includes a first support plate 5111, a second support plate 5112 and a third support plate 5113, and the weights include a first weight 5121, a second weight 5122 and a third weight 5123 which are disposed corresponding to the support plates. When the calibration of the force sensor 12 is performed, the first weight 5121, the second weight 5122 and the third weight 5123 are lifted in sequence, so that the weights are separated from the corresponding support plates, and further the actual measurement values of the weights are obtained. In other embodiments, other numbers of support plates and corresponding weights may be provided.
The weight components are arranged at the left and right sides of the frame 1, and idler wheels 53 are correspondingly arranged on the frame 1; one end of the connecting rope 52 passes through the idler wheel 53 and is connected with the weight assembly 51. The idler wheel 53 serves to guide the connecting rope 52 and to change the direction of the connecting rope 52, i.e. to change the direction of the force between the force in the vertical direction of the lifting weight and the force in the horizontal direction of the pulling measuring arm 34. The connecting cord 52 is preferably a flexible steel cord. The end of the connecting rope 52 between the idler wheel 53 and the force measuring arm 34 remains horizontal at all times when the calibration of the force sensor 12 is performed.
As shown in fig. 4 to 5, the slide rails include an upper slide rail 91, a lower slide rail 92, and a fixing clip 93 for fixing the relative position between the upper slide rail 91 and the lower slide rail 92, and the lower end of the moving plate 32 is provided with an unlocking assembly 10 for unlocking the fixing clip 93 so that the upper slide rail 91 and the lower slide rail 92 are in a relatively free sliding state. The unlocking assembly 10 in this embodiment includes an unlocking plate 101, and when the moving plate 32 moves downward, the unlocking plate 101 moves downward synchronously and presses down the fixing clip 93, so as to unlock the fixing clip 93, so that the upper slide rail 91 and the lower slide rail 92 can slide relatively freely.
The slide rail fixing mechanism 7 is used for fixing the lower slide rail 92, and the slide rail fixing mechanism 7 comprises a fixed block positioned below the slide rail and clamping assemblies 8 positioned on two sides of the lower slide rail 92 in the length direction; the clamping assembly 8 is used for limiting the horizontal displacement of the lower slide rail 92 in the length direction; the fixing blocks comprise a first fixing block 71 and a second fixing block 72, the first fixing block 71 is provided with a containing groove, the lower sliding rail 92 is contained in the containing groove, the top of the second fixing block 72 is provided with a fixing pin, and the fixing pin is used for being inserted into the lower sliding rail 92 to fix the relative position of the lower sliding rail 92 and the second fixing block 72. The clamping assembly 8 includes a tightening block 81 and a driver 82 for driving the tightening block 81 to move relative to the slide rail, the tightening block 81 being located on the same horizontal plane as the lower slide rail 92.
A guide rail 11 is provided between the moving plate 32 and the fixed plate 31, and the moving plate 32 is moved, limited and guided by the guide rail 11. A guide rail 11 is preferably provided below the moving frame 41 to guide the movement of the moving frame 41.
The lower end of the measuring arm 34 is provided with a bolt 343, and the bolt 343 is used for fixing the position between the measuring arm 34 and the upper slide rail 91 and for connecting one end of the connecting rope 52. In this embodiment, the lower end of the measuring arm 34 is provided with a concave rectangular hole 342, and the latch 343 is provided with a stop collar 344 matching with the rectangular hole 342 to avoid rotation of the latch 343. Meanwhile, in order to hook the end of the connecting rope 52 and prevent the connecting rope 52 from falling off during calibration, the latch 343 is further provided with an annular groove 345 to hook the connecting rope 52, as shown in fig. 8.
In this embodiment, when the automatic calibration device for the force sensor 12 performs a conventional test, the pin 343 at the lower end of the force measuring arm 34 is inserted into the hole corresponding to the upper sliding rail 91, the driving mechanism 4 drives the movement testing mechanism 3 to move, the force measuring arm 34 drives the sliding rail to continuously reciprocate, and the force sensor 12 is kept in a working state. After a certain period of time, the force sensor 12 needs to be calibrated, when the calibration is performed, the sliding rail is detached from the sliding rail fixing mechanism 7, and the force measuring arm 34 is connected with the connecting rope 52 to calibrate the force sensor 12.
Example 2 calibration method
The present embodiment provides a method for calibrating a force sensor 12 based on the automatic calibration device for the force sensor 12 in embodiment 1, which specifically includes the following steps:
1) The driving mechanism 4 drives the movable testing mechanism 3 to move to a proper position in the horizontal direction, and the vertical driving assembly 33 drives the movable plate 32 to further drive the force measuring arm 34 to descend to a corresponding height, wherein the position is an initial position;
2) One end of a connecting rope 52 is sleeved on a bolt 343 at the lower end of the force measuring arm 34, and the other end of the connecting rope is connected with a weight assembly 51;
3) Starting a calibration program: the driving mechanism 4 drives the movable testing mechanism 3 to slowly move to a first position to drive the first weight 5121 to be separated from the first supporting plate 5111, and the actual numerical value of the force sensor 12 is recorded at the moment;
4) The driving mechanism 4 drives the movable testing mechanism 3 to slowly move to a second position to drive the second weight 5122 to be separated from the second supporting plate 5112, and the actual numerical value of the force sensor 12 is recorded at the moment;
5) The driving mechanism 4 drives the movable testing mechanism 3 to slowly move to a third position to drive the third weight 5123 to be separated from the third supporting plate 5113, and the actual numerical value of the force sensor 12 is recorded at the moment;
6) The driving mechanism 4 drives the movable testing mechanism 3 to slowly move to an initial position and drives the three weights to be replaced on the corresponding supporting plates;
7) The connecting rope 52 is removed from the pin 343, the connecting rope 52 on the other side of the calibrating mechanism 5 is connected to the pin 343 below the force measuring arm 34, and the steps are repeated;
8) Calibrating and compensating the sensor according to the actual numerical value and theoretical data of the left and right calibrating mechanisms 5; calibration of the force sensor 12 is completed.
For convenience of description and understanding, the above step numbers are described separately, but the present invention is not limited thereto, and in actual situations, at least some of the above steps may be performed simultaneously or in no sequence, for example, the sequence of the calibration mechanisms on the left and right sides is not clear.
The automatic, quick and accurate calibration device and the calibration method thereof for the force sensor are used for quick and accurate calibration of the force sensor in the equipment containing the tension and pressure (pressure and/or tension).
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (7)
1. An automatic calibration device for a force sensor is characterized in that: the calibration device comprises a frame, a moving device and a calibration mechanism for calibration, wherein the moving device comprises a moving test mechanism and a driving mechanism for driving the moving test mechanism to move, the force sensor is arranged on the moving test mechanism, and the moving test mechanism comprises a force measuring arm; the calibration mechanism comprises a weight component and a connecting rope for connecting the weight component and the force measuring arm, and the force measuring arm is used for being connected with the connecting rope and driving the weight component to move; the driving mechanism comprises a movable frame for fixing the movable testing mechanism, and a guide rail and a buffer assembly are arranged between the movable testing mechanism and the movable frame;
The movable testing mechanism comprises a fixed plate, a movable plate arranged on the fixed plate in a sliding manner, and a vertical driving assembly used for driving the movable plate to move relative to the fixed plate, wherein the force measuring arm is rotationally connected with the movable plate, and the force sensor is arranged between the force measuring arm and the fixed plate;
The buffer assembly is arranged between the movable frame and the fixed plate, a stop block is arranged at the top of the movable frame, a buffer part is arranged at the top of the fixed plate, the buffer assembly comprises a buffer and a buffer block arranged at the end part of an output shaft of the buffer, one part of the buffer block is contacted with the buffer part, and the rest part of the buffer block is contacted with the stop block; the buffer is a cylinder;
The rack is provided with a slide rail fixing mechanism, the slide rail comprises an upper slide rail, a lower slide rail and a fixing clamp for fixing the relative position between the upper slide rail and the lower slide rail, and the lower end of the moving plate is provided with an unlocking component for unlocking the fixing clamp so that the upper slide rail and the lower slide rail are in a relative free sliding state;
The lower end of the force measuring arm is provided with a bolt, and the bolt is used for fixing the position between the force measuring arm and the upper sliding rail and connecting one end of the connecting rope; the lower end of the force measuring arm is provided with a concave rectangular hole, and the bolt is provided with a limiting ring matched with the rectangular hole and used for limiting the rotation of the bolt; the latch is provided with an annular groove for hooking the connecting rope.
2. The automatic calibration device for force sensors of claim 1, wherein: the weight assembly comprises a weight assembly, wherein the weight assembly comprises a fixing frame and weights arranged in the fixing frame; the fixing frame comprises a plurality of supporting plates, and the weights comprise a plurality of weights which are arranged corresponding to the supporting plates.
3. The automatic calibration device for force sensors of claim 2, wherein: the weight assembly is arranged on the side part of the frame, and an idler wheel is arranged on the frame; one end of the connecting rope penetrates through the idler wheel and then is connected with the weight assembly.
4. The automatic calibration device for force sensors of claim 1, wherein: the force measuring arm comprises a force measuring arm body and is characterized in that a first rotating joint is arranged between the upper section of the force measuring arm and the moving plate, a second rotating joint is arranged at the middle section of the force measuring arm body, a third rotating joint is arranged on the moving plate, and a force sensor is arranged between the second rotating joint and the third rotating joint.
5. The automatic calibration device for force sensors of claim 1, wherein: the driving mechanism comprises a horizontal driving assembly for driving the moving frame to move along the horizontal direction, and the horizontal driving assembly comprises a screw rod and a motor for driving the screw rod to rotate; the fixed plate is fixedly arranged on the movable frame.
6. The automatic calibration device for force sensors of claim 1, wherein: the sliding rail fixing mechanism is used for fixing the lower sliding rail and comprises a fixing block positioned below the sliding rail and clamping assemblies positioned on two sides of the length direction of the lower sliding rail; the clamping assembly is used for limiting horizontal displacement in the length direction of the lower sliding rail; the fixed block comprises a first fixed block and/or a second fixed block, the first fixed block is provided with a containing groove, the lower sliding rail is contained in the containing groove, the top of the second fixed block is provided with a fixing pin, and the fixing pin is used for being inserted into the lower sliding rail to fix the relative position of the lower sliding rail and the second fixed block.
7. A method for calibrating a force sensor according to any of claims 1-6, characterized by the steps of:
The connecting rope is connected with the force measuring arm and the weight component, the force measuring arm is driven by the driving mechanism to move and the weight component is driven to move, and the actual numerical value of the force sensor is recorded; and calibrating the force sensor by comparing the actual value with the theoretical value of the force sensor.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403391A (en) * | 2015-12-08 | 2016-03-16 | 苏州工业园区格比机电有限公司 | Slide rail performance testing device and testing method thereof |
| CN111044276A (en) * | 2019-12-27 | 2020-04-21 | 苏州托克斯冲压设备有限公司 | Sliding force floating testing mechanism |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931182A (en) * | 2015-06-25 | 2015-09-23 | 苏州瑞美科材料科技有限公司 | Automobile seat sliding rail running-in force testing equipment |
| CN107462355B (en) * | 2017-08-02 | 2020-04-10 | 广州敏实汽车零部件有限公司 | Automatic force measuring special machine for seat slide rail |
| CN111551311B (en) * | 2020-06-17 | 2021-07-20 | 河北省科学院应用数学研究所 | Pressure sensor calibration device and calibration method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403391A (en) * | 2015-12-08 | 2016-03-16 | 苏州工业园区格比机电有限公司 | Slide rail performance testing device and testing method thereof |
| CN111044276A (en) * | 2019-12-27 | 2020-04-21 | 苏州托克斯冲压设备有限公司 | Sliding force floating testing mechanism |
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