CN215374337U - Automatic calibration equipment for force sensor - Google Patents

Abstract

The utility model discloses automatic calibration equipment for a force sensor, which comprises a rack, a mobile device and a calibration mechanism for calibration, wherein the mobile device comprises a mobile testing mechanism and a driving mechanism for driving the mobile testing mechanism to move; 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. According to the automatic calibration equipment for the force sensor, the driving mechanism is arranged to drive the mobile testing mechanism to move, the force measuring arm is driven to move, the weight component is further lifted, and the force sensor is calibrated by comparing the measured actual value with the theoretical value.

Description

Automatic calibration equipment for force sensor

Technical Field

The utility model belongs to the technical field of calibration equipment, and particularly relates to automatic calibration equipment for a force sensor.

Background

In the assembly production of the sliding rail, because the requirements of the automobile industry on the safety and the comfort of the seat sliding rail are higher and higher, the sliding force of the seat on the sliding rail is moderate, the seat can move uniformly and stably, and all products need to be subjected to accurate sliding force test. The rail suppliers have strict standards for the sliding force test of the rail, including the speed of the sliding force test, the magnitude of the sliding force, the test accuracy, and so on. The sliding force testing range of a common sliding rail is 30-50N, and the sliding force testing range of a high-end product is more severe.

Due to the rapid development of the automobile industry, the production and test rhythm of the slide rail is higher and higher, the production rhythm of the slide rail is generally 10-15 seconds, and some manufacturers have increased to 5.5 seconds, so that the high yield requires that equipment suppliers need to reduce the auxiliary time for equipment production.

In the sliding force test of the sliding rail, in order to compensate the measurement error of the tension-compression type sensor and improve the measurement accuracy, the sensor must be periodically calibrated to improve the system accuracy of the equipment. The calibration of the sensor is to establish the relationship between the input quantity and the output quantity of the sensor through experiments, determine the error relationship under different use conditions, calibrate and compensate the sensor through software or program processing, and ensure the actual measurement precision 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 influenced by the skill and proficiency of manual operation. Due to the requirements of actual production on equipment efficiency and measurement precision, the calibration time of the sensor must be shortened, errors caused by human factors are eliminated, a set of automatic calibration mechanical mechanism and system needs to be developed to replace manual calibration, and the problems of long calibration time, low efficiency and poor precision of the traditional manual calibration are solved.

SUMMERY OF THE UTILITY MODEL

In view of the above, in order to overcome the defects of the prior art, the present invention aims to provide an automatic calibration apparatus for a force sensor, which is capable of realizing automatic calibration of the force sensor.

In order to achieve the purpose, the utility model adopts the following technical scheme:

an automatic calibration device for a force sensor comprises a rack, 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 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 is arranged to drive the mobile testing mechanism to move, the force measuring arm is driven to move, the weight component is further lifted, and the force sensor is calibrated by comparing measured actual values with theoretical values.

According to some preferred aspects of the utility model, the weight assembly comprises a weight assembly comprising a mount and weights disposed within the mount; the mount includes a plurality of backup pads, the weight is including a plurality of weights that correspond the backup pad setting. The weight is the weight of predetermineeing weight, has corresponding theoretical numerical value, promotes corresponding weight through the dynamometry arm, and force transducer obtains corresponding measurement numerical value, compares the actual numerical value of measurement and the theoretical numerical value that the weight corresponds, and then marks the sensor.

In some embodiments, the fixing frame comprises a first supporting plate, a second supporting plate and a third supporting plate, and the weights comprise a first weight, a second weight and a third weight which are arranged corresponding to the supporting plates. When carrying out force sensor's calibration, promote first weight, second weight and third weight in proper order for the weight and the backup pad phase separation that corresponds, and then obtain the actual measurement numerical value of weight.

According to some preferred aspects of the utility model, the weight assembly is provided at a side of the frame, the frame having an idler wheel provided thereon; one end of the connecting rope penetrates through the idle wheel and then is connected with the weight component. The idler is used for guiding the connecting rope and for changing the direction of the connecting rope, namely changing the direction of force between the force in the vertical direction for lifting the weight and the force in the horizontal direction for pulling the 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 utility model, the calibration mechanisms are arranged on the left side and the right side of the frame to calibrate the pulling and pressing forces 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 includes a fixed plate, a moving plate slidably disposed 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 to the moving plate, and the force sensor is disposed between the force measuring arm and the fixed plate. The fixed plate is used for connecting the mobile testing mechanism with the driving mechanism, and the vertical driving assembly is used for driving the mobile plate to move so as to drive the force measuring arm to move, so that the force measuring arm is moved downwards to be connected with the connecting rope when calibration is needed, and one end of the connecting rope is kept horizontal; the force measuring arm is driven to move upwards when calibration is not needed.

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 rotary joint and the third rotary joint are positioned 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. The movable plate is provided with a limiting block, a limiting stop block is arranged above and below the fixed plate corresponding to the limiting block, and a buffer piece is arranged on the limiting stop block. The outer side of the force measuring arm is provided with a guide groove, the top end of the fixing plate is provided with a guide block, and the guide block is used for guiding the up-and-down movement of the force measuring arm and retreating from the guide groove when the force measuring arm is tested or calibrated so as to avoid blocking.

According to some preferred implementation aspects of the utility model, the driving mechanism comprises a moving frame for fixing the moving testing mechanism, and 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 is disposed between the moving frame and the fixed plate, the stopper is disposed on the top of the moving frame, the buffer portion is disposed on the top of the fixed plate, 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 a remaining portion of the buffer block is in contact with the stopper. The movable frame is not rigidly connected with the fixed plate, and the rigid connection can generate collision at a moving terminal point when the screw rod rotates to drive the movable frame and the movable testing mechanism to move, so that related parts are easily damaged. In some embodiments of the utility model, the movable frame and the fixed plate are in a flexible connection form formed by combining the guide rail and the buffer assembly, and the buffer assembly can effectively play a role of buffering in the moving process of the movable frame, so that 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 implementation aspects of the present invention, a slide rail fixing mechanism is disposed on the rack, the slide rail includes an upper slide rail, a lower slide rail and a fixing clip for fixing a relative position between the upper slide rail and the lower slide rail, and an unlocking assembly for unlocking the fixing clip to enable the upper slide rail and the lower slide rail to be in a relatively free sliding state is disposed at a lower end of the moving plate. The lower extreme of survey arm of force is provided with the bolt, the bolt is used for fixing survey arm of force and last slide rail between the position and be used for connecting the one end of rope. In some embodiments of the utility model, the lower end of the force measuring arm is provided with an inwards concave rectangular hole, and the bolt is provided with a limit ring matched with the rectangular hole so as to prevent the bolt from rotating. Simultaneously, in order to hook the tip of connecting the rope, prevent to mark the drop of in-process connection rope, still seted up annular slot on the bolt in order to hook the connection rope.

In some embodiments of the present invention, the unlocking assembly includes an unlocking plate, and when the moving plate moves downward, the unlocking plate synchronously moves downward and presses the fixing clamp downward, so as to unlock the fixing clamp, so that the upper sliding rail and the lower sliding rail can slide freely relative to each other.

According to some preferred implementation aspects of the present invention, the slide rail fixing mechanism is configured to fix the lower slide rail, and the slide rail fixing mechanism includes a fixing block located below the slide rail and clamping assemblies located at two sides of the lower slide rail in the length direction; the clamping assembly is used for limiting the horizontal displacement of the lower sliding rail in the length direction; the fixed block includes first fixed block and/or second fixed block, the holding tank has on the first fixed block, the slide rail holds down in the holding tank, the top of second fixed block has the fixed pin, the fixed pin is used for inserting in the slide rail down with the fixed relative position of slide rail and second fixed block. The clamping assembly comprises a propping block and a driver for driving the propping block to move relative to the sliding rail. The abutting block and the lower sliding rail are located on the same horizontal plane.

Compared with the prior art, the utility model has the advantages that: according to the automatic calibration equipment for the force sensor, the driving mechanism is arranged to drive the mobile 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.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a perspective view of a first viewing angle of an automatic calibration apparatus for a force sensor according to an embodiment of the present invention;

FIG. 2 is a perspective view of a second perspective of the automatic calibration apparatus for a force sensor according to an embodiment of the present invention;

FIG. 3 is a front view of an automatic calibration apparatus for a force sensor in an embodiment of the present invention;

FIG. 4 is a front view of the mobile testing mechanism and the slide fixing mechanism in an embodiment of the present invention;

FIG. 5 is a perspective view of the mobile testing mechanism and the slide rail fixing mechanism in the embodiment of the present invention;

FIG. 6 is a perspective view of an alignment mechanism in an embodiment of the present invention;

FIG. 7 is a cross-sectional view of an alignment mechanism in 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 attached drawing, a machine frame-1, a moving device-2, a moving testing mechanism-3, a fixed plate-31, a moving plate-32, a vertical driving component-33, a force 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 buffering component-373; a driving mechanism-4, a moving frame-41, a horizontal driving component-42, a screw rod-421 and a motor-422; the weight-adjusting mechanism comprises a calibration mechanism-5, a weight component-51, a fixing frame-511, a first supporting plate-5111, a second supporting plate-5112, a third supporting plate-5113, a first weight-5121, a second weight-5122, a third weight-5123, a connecting rope-52 and an idler wheel-53; a buffer component-6, a block-61, a buffer part-62, a buffer-63 and a buffer block-64; a slide rail fixing mechanism-7, a first fixing block-71 and a second fixing block-72; a clamping assembly-8, a holding block-81, a driver-82; an upper slide rail-91, a lower slide rail-92 and a fixing clamp-93; an unlocking component-10 and an unlocking plate-101; a guide rail-11 and a force sensor-12.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Embodiment 1 automatic calibration device for force sensor

Referring to fig. 1 to 8, the automatic calibration device for the force sensor 12 in the present embodiment includes a rack 1, a slide rail fixing mechanism 7 disposed on the rack 1, a moving device 2, and a calibration mechanism 5 for calibration, where the moving device 2 includes a moving testing mechanism 3 and a driving mechanism 4 for driving the moving testing mechanism 3 to move, and the force sensor 12 is disposed on the moving testing mechanism 3. The following details the various components:

as shown in fig. 4-5, 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, wherein the force measuring arm 34 is rotatably connected to 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 mobile testing mechanism 3 with the driving mechanism 4, and the vertical driving assembly 33 is used for driving the mobile plate 32 to move, so as to drive the force measuring arm 34 to move vertically, so that the force measuring arm 34 moves 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 horizontal; the force-measuring arm 34 is driven to move upwards when calibration is not required.

A first rotating joint 351 is arranged between the upper section of the force measuring arm 34 and the moving plate 32, a second rotating joint 352 is arranged at the middle section of the force measuring arm 34, a third rotating joint 353 is arranged on the moving plate 32, and the force sensor 12 is arranged between the second rotating joint 352 and the third rotating joint 353. The second rotational joint 352 and the third rotational joint 353 are located on the same horizontal plane.

The moving plate 32 is provided with a limit block 371, a limit stop 61372 is arranged above and below the fixed plate 31 corresponding to the limit block 371, and a buffer 373 is arranged on the limit stop 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 retreats 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 testing mechanism 3, and 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 motor 422 and the screw 421 drive the moving frame 41 to move.

As shown in fig. 4 to 5, in the present embodiment, a buffer assembly 6 is further disposed between the moving frame 41 and the fixed plate 31, a stopper 61 is disposed on the top of the moving frame 41, a buffer portion 62 is disposed on the top of the fixed plate 31, the buffer assembly 6 includes a buffer 63 such as an air cylinder and a buffer block 64 disposed at an output shaft end portion of the buffer 63, a portion of the buffer block 64 is in contact with the buffer portion 62, and the remaining portion of the buffer block 64 is in contact with the stopper 61. The flexible connection form that moving frame and fixed plate adopted guide rail and buffer assembly combination to form in this embodiment, at moving frame's removal in-process, can effectively play the cushioning effect through buffer assembly's setting, avoids causing the damage to relevant part when guaranteeing that moving frame effectively removes, effectively prolongs the life of part. In this embodiment, one 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 cord 52 connecting the weight assembly to the load arm 34, and the load arm 34 is configured to connect to the connecting cord 52 and move the weight assembly. The left side and the right side of the frame 1 are respectively provided with a calibration mechanism 5 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, and the weight assembly 51 comprises a fixing frame 511 and weights arranged in the fixing frame 511; the fixing frame 511 includes a plurality of support plates, and the weights include a plurality of weights provided corresponding to the support plates. The weight is for predetermineeing the weight of weight, has corresponding theoretical numerical value, promotes corresponding weight through force measuring arm 34, and force sensor 12 obtains corresponding measurement numerical value, compares the theoretical numerical value that measured actual numerical value and weight correspond, and then marks the sensor.

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 disposed corresponding to the support plates. When the force sensor 12 is calibrated, the first weight 5121, the second weight 5122 and the third weight 5123 are sequentially lifted, so that the weights are separated from the corresponding support plates, and 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 the frame 1 is correspondingly provided with an idle wheel 53; one end of the connecting rope 52 passes through the idler pulley 53 and then is connected with the weight assembly 51. The idler wheel 53 serves for guiding the connecting cord 52 and for changing the direction of the connecting cord 52, i.e. the change in the direction of the force between the force in the vertical direction that will lift the weight and the force in the horizontal direction that pulls the load arm 34. The connecting cord 52 is preferably a flexible steel cord. During calibration of the force sensor 12, the end of the connecting cable 52 located between the idler wheel 53 and the load arm 34 is always kept horizontal.

As shown in fig. 4 to 5, the slide rail includes 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 synchronously moves downward and presses down the fixing clip 93, so as to unlock the fixing clip 93, and the upper slide rail 91 and the lower slide rail 92 can slide freely relative to each other.

The sliding rail fixing mechanism 7 is used for fixing the lower sliding rail 92, and the sliding rail fixing mechanism 7 comprises a fixing block positioned below the sliding rail and clamping assemblies 8 positioned on two sides of the lower sliding 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 include a first fixing block 71 and a second fixing block 72, the first fixing block 71 has a receiving groove, the lower slide rail 92 is received in the receiving groove, and the second fixing block 72 has a fixing pin at the top thereof, the fixing pin is inserted into the lower slide rail 92 to fix the relative position of the lower slide rail 92 and the second fixing block 72. The clamping assembly 8 includes a propping block 81 and a driver 82 for driving the propping block 81 to move relative to the slide rail, and the propping block 81 and the lower slide rail 92 are located on the same horizontal plane.

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 force measuring arm 34 is provided with a latch 343, and the latch 343 is used for fixing the position between the force measuring arm 34 and the upper rail 91 and for connecting one end of the connecting rope 52. In this embodiment, the lower end of the force measuring arm 34 is provided with an inwardly concave rectangular hole 342, and the bolt 343 is provided with a limit ring 344 matching with the rectangular hole 342 to prevent the bolt 343 from rotating. 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 for hooking 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 a corresponding hole of the upper slide rail 91, the driving mechanism 4 drives the movement testing mechanism 3 to move, the force measuring arm 34 drives the slide rail to continuously reciprocate, and the force sensor 12 is kept in a working state. After a period of time, the force sensor 12 needs to be calibrated, and when the calibration is performed, the slide rail is detached from the slide 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 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 mobile testing mechanism 3 to move to a proper position in the horizontal direction, and the vertical driving assembly 33 drives the moving plate 32 to drive the testing arm 34 to descend to a corresponding height, wherein the position is an initial position;

2) one end of the connecting rope 52 is sleeved on the bolt 343 at the lower end of the force measuring arm 34, and the other end is connected with the weight component 51;

3) starting a calibration program: the driving mechanism 4 drives the mobile testing mechanism 3 to slowly move to the first position, drives the first weight 5121 to be separated from the first supporting plate 5111, and records the actual numerical value of the force sensor 12 at the moment;

4) the driving mechanism 4 drives the mobile testing mechanism 3 to slowly move to the second position, drives the second weight 5122 to be separated from the second supporting plate 5112, and records the actual value of the force sensor 12 at the moment;

5) the driving mechanism 4 drives the mobile testing mechanism 3 to slowly move to the third position, drives the third weight 5123 to be separated from the third supporting plate 5113, and records the actual numerical value of the force sensor 12 at the moment;

6) the driving mechanism 4 drives the mobile testing mechanism 3 to slowly move to the initial position, and drives the three weights to be replaced on the corresponding supporting plates;

7) the connecting rope 52 is taken down from the bolt 343, the connecting rope 52 on the calibrating mechanism 5 on the other side is connected to the bolt 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 calibration mechanisms 5; calibration of the force sensor 12 is completed.

For convenience of description and understanding, the above steps are numbered separately, but the number is not limited thereto, and in practical cases, at least some of the steps may be performed simultaneously or in a non-sequential order, for example, the right and left side calibration mechanisms may not be in a definite order.

The utility model relates to an automatic, rapid and accurate calibration device and a calibration method of a force sensor, which are used for rapid and accurate calibration of the force sensor in equipment containing a tension and pressure (pressure and/or tension) sensor.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the utility model, and not to limit the scope of the utility model, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims (10)

1. The utility model provides an automatic calibration equipment of force transducer which characterized in that: the force sensor is placed on the mobile testing mechanism, and the mobile testing mechanism comprises a testing 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.

2. The automatic calibration device for force sensor according to claim 1, characterized in that: the weight component comprises a weight component, and the weight component comprises a fixing frame and weights arranged in the fixing frame; the mount includes a plurality of backup pads, the weight is including a plurality of weights that correspond the backup pad setting.

3. The automatic calibration device for force sensor according to claim 2, characterized in that: the mount includes first backup pad, second backup pad and third backup pad, the weight is including corresponding first weight, second weight and the third weight that each backup pad set up respectively.

4. The automatic calibration device for force sensor according to claim 2, characterized in that: 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 idle wheel and then is connected with the weight component.

5. The automatic calibration device for force sensor according to claim 1, characterized in that: the movable testing mechanism comprises a fixed plate, a movable plate and a vertical driving assembly, the movable plate is arranged on the fixed plate in a sliding mode, the vertical driving assembly is used for driving the movable plate to move relative to the fixed plate, the force measuring arm is rotatably connected with the movable plate, and the force sensor is arranged between the force measuring arm and the fixed plate.

6. The automatic calibration device for force sensor according to claim 5, characterized in that: the force measuring device 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 in the middle section of the force measuring arm, a third rotating joint is arranged on the moving plate, and the force sensor is arranged between the second rotating joint and the third rotating joint.

7. The automatic calibration device for force sensor according to claim 5, characterized in that: the driving mechanism comprises a moving frame for fixing the moving testing mechanism and a horizontal driving assembly for driving the moving frame to move along the horizontal direction, and the fixing plate is fixedly installed on the moving frame.

8. The automatic calibration device for force sensor according to claim 7, characterized in that: the buffer assembly comprises a hydraulic cylinder and a buffer block arranged at the end part of an output shaft of the hydraulic cylinder, wherein one part of the buffer block is contacted with the buffer part, and the other part of the buffer block is contacted with the stop block.

9. The automatic calibration device for force sensor according to claim 5, characterized in that: the sliding rail fixing mechanism is arranged on the rack and comprises an upper sliding rail, a lower sliding rail and a fixing clamp used for fixing the relative position between the upper sliding rail and the lower sliding rail, and an unlocking assembly used for unlocking the fixing clamp so that the upper sliding rail and the lower sliding rail are in a relatively free sliding state is arranged at the lower end of the moving plate.

10. The automatic calibration device for force sensor according to claim 9, characterized in that: 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 lower sliding rail in the length direction; the clamping assembly is used for limiting the horizontal displacement of the lower sliding rail in the length direction; the fixed block includes first fixed block and/or second fixed block, the holding tank has on the first fixed block, the slide rail holds down in the holding tank, the top of second fixed block has the fixed pin, the fixed pin is used for inserting in the slide rail down with the fixed relative position of slide rail and second fixed block.

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