CN215004080U - Force measuring instrument calibration system based on digital stress ring - Google Patents

Abstract

The utility model discloses a dynamometer calibration system based on digital stress ring, including digital stress ring, thrust augmentation device, image acquisition terminal and data processing terminal, wherein the thrust augmentation device can provide stable deformation power for digital stress ring, and the data processing terminal automatically acquires the length indicating value of digital stress ring and converts the length indicating value into real-time force value, has realized the continuous measurement of force value; when the force value reaches the set calibration point, the image acquisition terminal acquires the force value displayed by the current dynamometer and transmits the force value to the data processing terminal, the data processing terminal compares the indicating value displayed on the dynamometer with the acquired real-time force value of the digital stress ring to obtain indicating value error, repeatability and other parameters of the dynamometer so as to complete calibration work, manual intervention is not needed in the whole process, automation and digitization of the calibration work are realized, the calibration efficiency is improved, and the measurement error is reduced.

Description

Force measuring instrument calibration system based on digital stress ring

Technical Field

The utility model belongs to the technical field of the power value is measured, concretely relates to dynamometer calibration system based on digital stress ring.

Background

The dynamometer is a metering instrument for measuring various force values or loads, the dynamometer needs to be regularly calibrated in the use process, and the stress ring is a common device for calibrating the dynamometer. The stress ring mainly comprises an elastic ring and a dial indicator, the deformation coefficient of the stress ring needs to be corrected according to the field temperature in use, the length indication value read by the dial indicator is converted into a force value according to the newly calculated deformation coefficient, and finally the force value is compared with the indication value displayed on the dynamometer, so that parameters such as indication value error, repeatability and the like of the detected equipment are obtained.

The stress ring currently has the following disadvantages in application: (1) the non-force value unit output is adopted, so that only the breakpoint can be measured, and continuous observation is inconvenient to carry out; (2) in the calibration process, the reading of the force value is difficult to accurately stay at a required calibration point, the reading is required during the movement of a pointer of the dial indicator, and the accuracy of manual reading is not high; (3) two persons are needed to cooperate in the calibration process, one person reads the display force value of the dynamometer, and the other person reads the numerical value of the dial indicator of the digital stress ring, so that the operation is complicated, and the efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a dynamometer calibration system based on digital stress ring can the digital stress ring reading of automatic acquisition, converts non-power value unit into real-time power value, has solved the discontinuous and big problem of artifical reading error of digital stress ring numerical value, need not artificial intervention, realizes the automation and the digitization of calibration work, improves calibration efficiency and calibration accuracy.

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

a force measuring instrument calibration system based on a digital stress ring comprises a force measuring instrument, wherein the force measuring instrument comprises a force sensor, and the instrument calibration system further comprises the digital stress ring, a working frame, a force applying device, an image acquisition terminal and a data processing terminal; the working frame comprises an upper pressing plate, a bottom plate and an adjusting mechanism, wherein the adjusting mechanism is connected with the upper pressing plate and the bottom plate respectively, one end of a force sensor is connected with the upper pressing plate, the other end of the force sensor is connected with one end of a digital stress ring, the other end of the digital stress ring is connected with one end of a force applying device, the other end of the force applying device is connected with the bottom plate, and the digital stress ring and an image acquisition terminal are connected with a data processing terminal respectively.

Furthermore, the digital stress ring comprises a first fixed seat, a second fixed seat, an elastic ring, a fixed block, a fixed arm, a movable arm and a displacement sensor; the utility model discloses a displacement sensor, including fixed arm and fixed block, shift sensor's detection head, the fixed arm is connected with the fixed block, shift arm and fixed block sliding connection, the bottom of first fixing base is passed the upper end of elastic ring and is connected with the fixed arm, the top of second fixing base is passed behind the lower extreme of elastic ring and is connected with the shift arm, the top of first fixing base is connected with force transducer, the bottom of second fixing base is connected with thrust augmentation device, displacement sensor's stiff end is connected with the fixed arm, displacement sensor's detection head passes behind the fixed arm towards the shift arm setting, displacement sensor is connected with data processing terminal.

Furthermore, digital stress ring still includes reset spring, reset spring's both ends are connected with fixed arm and removal arm respectively.

Furthermore, the digital stress ring further comprises a force guide block, two ends of the force guide block are respectively connected with the moving arm and the second fixing seat, and two ends of the force guide block are in a conical shape.

Further, the boosting device comprises a shell, a lifting base, a worm wheel, a worm and a worm wheel shaft; the lower bottom surface of the shell is connected with the bottom plate, one end of the lifting base is connected with the second fixing base, the other end of the lifting base is connected with the base upright post, a guide groove matched with the base upright post is formed in the upper top surface of the shell, the worm wheel, the worm and the worm wheel shaft are arranged in the shell, the worm wheel is meshed with the worm, the worm wheel is sleeved on the lower portion of the worm wheel shaft, the upper portion of the worm wheel shaft is arranged in the base upright post in a penetrating mode, and the worm wheel shaft is in threaded connection with the base upright post.

Furthermore, the force applying device further comprises a first conical bearing and a second conical bearing, the first conical bearing is arranged below the worm wheel and connected with the worm wheel shaft, and the second conical bearing is arranged above the worm wheel and connected with the worm wheel shaft.

Further, the worm is including setting up the worm axle at the worm both ends respectively, the inner wall of casing is provided with the fixed slot with worm axle adaptation, be provided with ball bearing in the fixed slot, the worm axle passes through ball bearing and is connected with the fixed slot rotation, the one end of wearing to establish out the casing of worm axle has seted up the afterburning hole.

Furthermore, the force applying device further comprises a bearing retainer ring, and the bearing retainer ring is arranged between the fixing groove and the outer ring of the ball bearing.

Has the advantages that: the utility model provides a pair of dynamometer calibration system based on digital stress ring, wherein work frame tightens up top board and bottom plate through adjustment mechanism, thereby with the force sensor of dynamometer, digital stress ring and thrust augmentation device are fixed, thrust augmentation device provides stable deformation power for digital stress ring, digital stress ring demonstrates the length indicating value that corresponds with the deformation volume under thrust augmentation device's effect, data processing terminal can automatic acquisition digital stress ring's length indicating value and convert the length indicating value into real-time force value, the problem of measuring the breakpoint among the prior art has been solved, the continuous measurement of force value has been realized; when the force value reaches the set calibration point, the image acquisition terminal acquires the force value displayed by the current dynamometer and transmits the force value to the data processing terminal, the data processing terminal compares the indicating value displayed on the dynamometer with the acquired real-time force value of the digital stress ring to obtain indicating value error, repeatability and other parameters of the dynamometer and further complete calibration work, manual intervention is not needed in the whole process, automation and digitization of the calibration work are achieved, personnel configuration can be reduced while errors caused by manual reading are eliminated, and calibration efficiency and calibration accuracy are improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of a portion a in fig. 1.

Fig. 3 is a side view of the worm in embodiment 3.

In the figure: 11-a first fixed seat; 12-an elastic ring; 13-a fixed arm; 14-fixing block; 15-a force guide block; 16-a second fixed seat; 17-a return spring; 18-a moving arm; 2-a force application device; 21-upper top surface; 22-base column; 23-a first conical bearing; 24-a worm gear shaft; 25-lower bottom surface; 26-a second conical bearing; 27-a worm gear; 28-a worm; 281-a fixed groove; 282-ball bearings; 283-bearing retainer ring; 284-force application hole; 285-worm shaft; 29-a lifting base; 3-a data processing terminal; 4-an image acquisition terminal; 5-a displacement sensor; 51-a measuring head; 61-an upper platen; 62-a bottom plate; 7-force sensor.

Detailed Description

The technical solution provided by the present invention will be described in detail by way of embodiments with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.

Example 1

As shown in fig. 1, the present embodiment provides a calibration system for a force measuring instrument based on a digital stress ring, which includes a force measuring instrument, the force measuring instrument includes a force sensor 7, the calibration system for the force measuring instrument further includes a digital stress ring, a working frame, a force applying device 2, an image collecting terminal 4, and a data processing terminal 3; the working frame comprises an upper press plate 61, a bottom plate 62 and an adjusting mechanism (not shown in the figure), preferably, the adjusting mechanism further comprises two symmetrically arranged upright columns, one end of each of the two upright columns is fixedly connected with the bottom plate 62, the other end of each of the two upright columns is respectively connected with two ends of the upper press plate 61, each upright column is in threaded connection with two nuts, the two nuts are respectively arranged at the upper end and the lower end of the corresponding upper press plate 61, up-and-down adjustment of the upper press plate 61 is realized by adjusting the positions of the two nuts, one end of a force sensor 7 is connected with the upper press plate 61, the other end of the force sensor 7 is connected with one end of a digital stress ring, the other end of the digital stress ring is connected with one end of a force applying device 2, the other end of the force applying device 2 is connected with the bottom plate 62, the digital stress ring and an image collecting terminal 4 are respectively connected with a data processing terminal 3, preferably, the data processing terminal 3 can adopt but not limited to a mobile terminal such as a portable computer or a tablet computer, the image capture terminal 4 may employ, but is not limited to, a camera.

In this embodiment, the digitized stress ring and the data processing terminal 3 and the image capturing terminal 4 and the data processing terminal 3 may be connected by a data line or wirelessly through a built-in wireless communication module.

The embodiment needs to be further explained, the embodiment can also meet the calibration requirements of various force measuring devices, for the force measuring devices such as a pressure testing machine, a tension testing machine or a universal testing machine, the device itself is provided with a fixing mechanism and a force applying mechanism, if the force applying speed of the testing machine is not controllable, only the digital stress ring and the force applying device 2 need to be matched and fixed on the fixing mechanism of the force measuring device, and a working frame is not needed for fixing; if the stress application speed of the testing machine is controllable, a working frame and a stress application device are not needed, and the digital stress ring is directly fixed on a fixing mechanism of the force measuring equipment for data acquisition.

In the embodiment, the force applying device 2, the digital stress ring and the force sensor 7 of the dynamometer are sequentially arranged on the bottom plate 62 and between the upper pressing plate 61 and are positioned on the same axis, the height position of the upper pressing plate 61 is adjusted through the adjusting mechanism, so that the force sensor, the digital stress ring and the force applying device of the dynamometer are in a state to be measured, the force applying device 2 provides stable deformation power for the digital stress ring, the digital stress ring deforms under the action of the force applying device 2 and displays a corresponding length indication value, the digital stress ring transmits the length indication value data to the data processing terminal 3 in a wired or wireless mode, the data processing terminal 3 can convert the length indication value into a real-time force value according to the deformation coefficient of the elastic ring 12, the linear relation between the length indication value and the force value of the digital stress ring at the current temperature is obtained, and the problem of measuring breakpoints in the prior art is solved, continuous measurement of force values is realized; it should be noted that the display device of the force measuring instrument can display the force value collected by the force sensor 7 in real time, when the force value reaches the set calibration point, the image acquisition terminal 4 performs OCR digital recognition on the force value data displayed by the dynamometer, the recognized force value data is transmitted to the data processing terminal 3, the data processing terminal 3 compares the indicating value displayed on the dynamometer with the acquired real-time force value of the digital stress ring to obtain indicating value error, repeatability and other parameters of the dynamometer so as to finish calibration work, the data processing terminal 3 has high data acquisition frequency and reliable reading synchronism, eliminates the reading error, improves the accuracy of the measurement result, does not need manual intervention in the whole process, realizes the automation and the digitization of the calibration work, the error caused by manual reading is eliminated, meanwhile, the personnel configuration can be reduced, and the calibration efficiency and the calibration accuracy are improved.

In this embodiment, as an optimal solution, the data processing terminal 3 is further connected to a certificate management system, the data processing terminal 3 can output a complete calibration record after completing the calibration work, and finally, the calibration record is accessed to the certificate management system to generate a calibration certificate of the force measuring instrument, so that the generation efficiency of the calibration certificate is improved, and meanwhile, the effective tracing of the calibration record is realized.

Example 2

The technical solution provided in this embodiment is further optimized on the basis of the technical solution of embodiment 1, and specifically includes:

as shown in fig. 1, in the present embodiment, the digital stress ring includes a first fixed seat 11, a second fixed seat 16, an elastic ring 12, a fixed block 14, a fixed arm 13, a movable arm 18, and a displacement sensor 5;

specifically, fixed arm 13 is connected with fixed block 14, removal arm 18 and fixed block 14 sliding connection, the bottom of first fixing base 11 passes the upper end of elastic ring 12 and is connected with fixed arm 13, the top of second fixing base 16 is passed and is connected with removal arm 18 behind the lower extreme of elastic ring 12, the top of first fixing base 11 is connected with force sensor 7, the bottom of second fixing base 16 is connected with thrust augmentation 2, the stiff end of displacement sensor 5 is connected with fixed arm 13, displacement sensor 5's detection head 51 passes fixed arm 13 after towards removal arm 18 setting, displacement sensor 5 is connected with data processing terminal 3. It should be noted that, the displacement sensor 5 may select a contact displacement sensor, the displacement of the moving arm 18 causes the resistance change of a potentiometer inside the contact displacement sensor, the change amount of the resistance value reflects the magnitude of the displacement, and the increase or decrease of the resistance value indicates the direction of the displacement, which has the characteristics of simple structure, convenient use, low price, etc., preferably, the contact displacement sensor may adopt a potentiometer type displacement sensor or a digital display dial indicator with data transmission function; the displacement sensor 5 can also select a non-contact displacement sensor such as a laser displacement sensor or an ultrasonic displacement sensor, measures the displacement of the moving arm 18 by utilizing the transmitting principle of laser or ultrasonic, and has the characteristics of avoiding mechanical friction, long service life and the like.

It should be noted that, the force applying device 2 applies a deformation power to the digital stress ring, the elastic ring 12 of the digital stress ring deforms, because the fixed block 14 and the fixed arm 13 are both fixedly connected to the first fixed seat 11, the second fixed seat 16 pushes the movable arm 18 to slide in the fixed block, the movable arm 18 moves during the sliding process, the detection end of the measuring head 51 moves along with the fixed block, and then the deformation quantity generated by the elastic ring 12 is converted into a length indication value of the displacement sensor 5, the displacement sensor 5 transmits the length indication value to the data processing terminal 3, the data processing terminal 3 collects the length indication value of the digital stress ring and converts the length indication value into a real-time force value according to the deformation coefficient of the elastic ring 12, and the non-force value unit is converted into a real-time force value.

In this embodiment, the digitized stress ring further includes a return spring 17, two ends of the return spring 17 are respectively connected with the fixed arm 13 and the moving arm 18, and the return spring 17 not only can enable the moving arm 18 to automatically reset after the calibration is completed, but also can enable the sliding process of the moving arm 18 on the fixed block 14 to be more stable, thereby further improving the accuracy of the measurement result of the displacement sensor 5.

In this embodiment, the digitized stress ring further includes a force guiding block 15, two ends of the force guiding block 15 are respectively connected to the moving arm 18 and one end of the second fixing seat 16 near the center of the elastic ring 12, and two ends of the force guiding block 15 are in a tapered shape.

Example 3

The technical solution provided in this embodiment is further optimized on the basis of the technical solution of embodiment 2, and specifically includes:

as shown in fig. 1-2, in the present embodiment, the force adding device 2 includes a housing, a lifting base 29, a worm wheel 27, a worm 28, and a worm wheel shaft 24; the lower bottom surface 25 of the shell is connected with the bottom plate 62, one end of the lifting base 29 is connected with the second fixing seat 16, the other end of the lifting base 29 is connected with the base upright column 22, the upper top surface 21 of the shell is provided with a guide groove matched with the base upright column 22, the worm wheel 27, the worm 28 and the worm wheel shaft 24 are arranged in the shell, the worm wheel 27 is meshed with the worm 28 to form a transmission pair, the worm wheel 27 is sleeved on the lower portion of the worm wheel shaft 24, the upper portion of the worm wheel shaft 24 is arranged in the base upright column 22 in a penetrating mode, the worm wheel shaft 24 is in threaded connection with the base upright column 22, preferably, the worm wheel shaft 24 is connected with the worm wheel 27 through two flat keys symmetrically arranged, the worm wheel shaft 24 is in threaded connection with the base upright column 22 to form a threaded pair, and the worm wheel shaft 24 is driven to move up and down by the threaded structure when rotating. In this embodiment, when the force applying device 2 works, torque is applied through the force applying hole, the worm 28 is rotated to drive the worm wheel 27 to rotate, the worm wheel drives the worm wheel shaft 24 to rotate, and the worm wheel shaft 24 drives the base upright column 22 to move, so that the lifting base 29 slowly rises or falls.

In this embodiment, force means 2 adopts worm gear and screw thread structure to carry out the transmission of power, compare with traditional gear drive, the drive ratio of worm wheel 27 and worm 28 is big, and worm gear and screw thread transmission all have auto-lock nature, overall structure is light and bearing capacity is strong, force means 2 can provide stable power for the digital stress ring, has effectively solved the uncontrollable and unstable problem of the power value of demarcation in-process force application speed of part dynamometer, has also ensured the safety of personnel and equipment simultaneously.

In this embodiment, the force applying device 2 further includes a first conical bearing 23 and a second conical bearing 26, the first conical bearing 23 is disposed below the worm wheel 27 and connected to the worm wheel shaft 24, and the second conical bearing 26 is disposed above the worm wheel 27 and connected to the worm wheel shaft 24. The first conical bearing 23 and the second conical bearing 26 are respectively sleeved above and below the worm wheel 27, so that two limit points with uniform stress can be provided for the worm wheel shaft 244, and the process that the worm wheel shaft 24 drives the base upright post 22 to move up and down is more stable.

As shown in fig. 3, in this embodiment, the worm 28 includes worm shafts 285 respectively disposed at two ends of the worm 28, the inner wall of the housing is provided with a fixing groove 281 adapted to the worm shafts 285, a ball bearing 282 is disposed in the fixing groove 281, the worm shaft 285 is rotatably connected to the fixing groove 281 through the ball bearing 282, one end of the worm shaft 285 penetrating the housing is provided with a force applying hole 284, during the calibration process, a user can penetrate a rotation driving structure such as an output shaft of the motor into the force applying hole to drive the worm shaft 285 to rotate, the ball bearing 282 can make the worm shaft 285 rotate more smoothly, preferably, the force applying device 2 further includes a bearing ring 283 disposed between the fixing groove 281 and an outer ring of the ball bearing 282, it should be noted that during the normal operation of the ball bearing 282, the outer ring of the ball bearing 282 is fixed on the fixing groove 281, and the inner ring of the ball bearing 282 rotates along with the worm shaft 285, by providing the bearing retainer 283 between the fixing groove 281 and the outer ring of the ball bearing 282, not only interference between the fixing groove 281 and the inner ring of the ball bearing 282 is prevented, but also the connection between the worm shaft 285, the ball bearing 282, and the fixing groove 281 is more stable.

Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A digital stress ring based force gauge calibration system, comprising a force gauge including a force sensor (7), characterized in that: the instrument calibration system also comprises a digital stress ring, a working frame, a force application device (2), an image acquisition terminal (4) and a data processing terminal (3); the working frame comprises an upper pressing plate (61), a bottom plate (62) and an adjusting mechanism, wherein the adjusting mechanism is connected with the upper pressing plate (61) and the bottom plate (62) respectively, one end of a force sensor (7) is connected with the upper pressing plate (61), the other end of the force sensor (7) is connected with one end of a digital stress ring, the other end of the digital stress ring is connected with one end of a force application device (2), the other end of the force application device (2) is connected with the bottom plate (62), and the digital stress ring and an image acquisition terminal (4) are connected with a data processing terminal (3) respectively.

2. The digital stress ring-based force gauge calibration system of claim 1, wherein: the digital stress ring comprises a first fixed seat (11), a second fixed seat (16), an elastic ring (12), a fixed block (14), a fixed arm (13), a movable arm (18) and a displacement sensor (5); fixed arm (13) are connected with fixed block (14), removal arm (18) and fixed block (14) sliding connection, the upper end of elastic ring (12) is passed and is connected with fixed arm (13) in the bottom of first fixing base (11), the top of second fixing base (16) is passed and is connected with removal arm (18) behind the lower extreme of elastic ring (12), the top and force transducer (7) of first fixing base (11) are connected, the bottom and force application device (2) of second fixing base (16) are connected, the stiff end and the fixed arm (13) of displacement sensor (5) are connected, detection head (51) of displacement sensor (5) pass fixed arm (13) after towards removal arm (18) setting, displacement sensor (5) are connected with data processing terminal (3).

3. The digital stress ring-based force gauge calibration system of claim 2, wherein: the boosting device (2) comprises a shell, a lifting base (29), a worm wheel (27), a worm (28) and a worm wheel shaft (24); the lower bottom surface (25) of the shell is connected with the bottom plate (62), one end of the lifting base (29) is connected with the second fixing seat (16), the other end of the lifting base (29) is connected with the base upright post (22), a guide groove matched with the base upright post (22) is formed in the upper top surface (21) of the shell, the worm wheel (27), the worm (28) and the worm wheel shaft (24) are arranged in the shell, the worm wheel (27) is meshed with the worm (28), the worm wheel (27) is sleeved on the lower portion of the worm wheel shaft (24), the upper portion of the worm wheel shaft (24) is arranged in the base upright post (22) in a penetrating mode, and the worm wheel shaft (24) is in threaded connection with the base upright post (22).

4. The digital stress ring-based force gauge calibration system of claim 3, wherein: the boosting device (2) further comprises a first conical bearing (23) and a second conical bearing (26), the first conical bearing (23) is arranged below the worm wheel (27) and connected with the worm wheel shaft (24), and the second conical bearing (26) is arranged above the worm wheel (27) and connected with the worm wheel shaft (24).

5. The digital stress ring-based force gauge calibration system of claim 3, wherein: the worm (28) is including setting up worm axle (285) at worm (28) both ends respectively, the inner wall of casing is provided with fixed slot (281) with worm axle (285) adaptation, be provided with ball bearing (282) in fixed slot (281), worm axle (285) are connected with fixed slot (281) rotation through ball bearing (282), afterburning hole (284) have been seted up to the one end of worm axle (285) of wearing to establish the casing.

6. The digital stress ring-based force gauge calibration system of claim 3, wherein: the boosting device (2) further comprises a bearing retainer ring (283), and the bearing retainer ring (283) is arranged between the fixing groove (281) and the outer ring of the ball bearing (282).

Images