CN114543837A

CN114543837A - Calibration device for multiple meters

Info

Publication number: CN114543837A
Application number: CN202210130348.7A
Authority: CN
Inventors: 陈浩; 刘闯; 孙晓光; 邵骏艺; 廖宇杰
Original assignee: Shanghai Institute of Measurement and Testing Technology
Current assignee: Shanghai Institute of Measurement and Testing Technology
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2022-05-27
Anticipated expiration: 2042-02-11
Also published as: CN114543837B

Abstract

The invention discloses a multi-meter calibrating device, which comprises: the stepping motor is arranged above the base; a reference angle encoder connected to a first end of a rotating shaft of the stepping motor through a driving shaft; a clamp installed at an end of the driving shaft for clamping the calibrated inclinometer; the base is also provided with a mounting position for mounting the polyhedral prism clamping assembly or the encoder clamping mechanism; the polyhedral edge clamping assembly comprises an expansion mandrel used for clamping a central hole of the polyhedral edge; the encoder clamping mechanism is used for clamping an encoder to be calibrated; the second end of the rotating shaft of the stepping motor is used for being connected with the expansion mandrel or the rotating shaft of the encoder to be calibrated. The calibrating device detects whether the precision of the inclinometer is qualified or not and whether the precision of the encoder and the regular polygon prism is qualified or not by using the high-precision encoder, so that the calibration of the inclinometer, the polygon prism and the encoder is realized, and the error in the calibrating process is greatly reduced.

Description

Calibration device for multiple meters

Technical Field

The invention relates to the field of measuring instruments, in particular to a multi-meter calibrating device.

Background

Currently, devices exist that have only a single function and are manually calibrated. In the detection process, the dead weight of the clamp drives the rotating shaft to make stable reading and reading more difficult, and the uncertainty of measurement of the current manual angle positioning is 0.005 degrees. This results in the laboratory amplifying the effect of artifacts on the measurement results when calibrating some samples with a resolution of 0.01 ° or higher. Meanwhile, the efficiency of the current calibration work is not high, and the time for measuring one device is about 20 minutes conventionally. With the rise of the traffic, the disadvantage of manual calibration is gradually highlighted. Meanwhile, the clamp of the conventional calibrating device has large appearance and weight, generates large moment in rotation, and causes inconvenience to the operation of detection personnel. Meanwhile, the appearance of the sample sent by the client is various, and the limitation of the existing clamp in use is more and more prominent.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention is directed to a multi-meter calibration device, a novel calibration device with integrated functions that can automatically visualize data manipulation. Based on relevant regulations and specifications, the light weight design of the device is completed under the condition of meeting the sample calibration requirement, the automatic calibration of the digital display angle gauge calibration device is realized, and the detection efficiency is improved.

To achieve the above object, the present invention provides a multi-meter calibration apparatus, comprising:

the stepping motor is arranged above the base;

a reference angle encoder connected to a first end of a rotating shaft of the stepping motor through a driving shaft;

a clamp mounted on an end of the drive shaft for clamping the calibrated inclinometer;

the base is also provided with a mounting position for mounting a polyhedral prism clamping assembly or an encoder clamping mechanism;

the polyhedral edge clamping assembly comprises an expansion mandrel used for clamping a central hole of the polyhedral edge;

the encoder clamping mechanism comprises a V-shaped block with a V-shaped groove on the top surface, and a lower pressing block which is arranged above the V-shaped block and used for pressing the encoder with the measured angle downwards and is used for clamping the encoder to be calibrated;

and the second end of the rotating shaft of the stepping motor is used for being connected with the expansion mandrel or the rotating shaft of the encoder to be calibrated.

The invention is further improved in that: the jig includes: the core plate is vertically arranged, and a rotating shaft connecting part is arranged in the center of the core plate;

the supporting plate is transversely arranged at the bottom of the core plate, and at least two horizontal spring sliding block assemblies are arranged on the upper surface of the supporting plate; the horizontal spring slide block assemblies are divided into two groups, and the inclinometers are pushed from two side surfaces respectively to form a clamping structure;

the side plates are respectively and vertically connected with the upper surface of the supporting plate and the core plate;

the pressing plate is parallel to the side plate;

the pressing plate is arranged between the side plate and the pressing plate, and a plurality of pushing springs are arranged between the pressing plate and the inner side surface of the pressing plate;

the driving mechanism is connected between the core plate and the pressing plate and used for driving the side plate pressing plate to drive the pressing plate to move towards the side plate, so that the pressing plate and the side plate respectively push two ends of the inclinometer to form a clamping mechanism;

the side that the pressure strip and the curb plate is relative all is provided with the vertical spring slider subassembly that pushes down and be used for with the layer board cooperation forms clamping structure.

The invention is further improved in that:

at least three optical axes are fixedly arranged on the side plate; each optical axis is parallel to the upper surface of the supporting plate; the pressing plate and the pressing plate are arranged on each optical axis in a sliding mode; the pushing springs between the pressing plate and the pressing plate are respectively wound on the optical axes;

the pressing plate is arranged on the slide rail of the core plate in a sliding mode through two slide blocks; the two slide rails are parallel to the upper surface of the supporting plate.

The invention is further improved in that: the driving mechanism comprises a direct current motor, a motor mounting frame, a coupler, a clamp screw rod and a nut connecting piece; the direct current motor is arranged on one side of the core plate through a motor mounting frame; the clamp screw rod is parallel to the upper surface of the supporting plate and is in transmission connection with an output shaft of the direct current motor through a coupler; the nut connecting piece is arranged on the clamp screw rod and is fixedly connected with the pressing plate.

The invention is further improved in that:

the polyhedral edge clamping assembly also comprises an L-shaped bracket; the base is provided with a mounting hole for fixing the L-shaped bracket in advance; the polyhedral prism clamping assembly is arranged above the base through the L-shaped bracket;

the expansion mandrel comprises a sleeve and a taper bolt; the first end of the sleeve is matched with the central hole of the polyhedral prism body and is divided into a plurality of expansion pieces; when the conical bolt is screwed into the sleeve, the expansion pieces are expanded to tension and fix the polyhedral pyramid;

the invention is further improved in that: a circle of raised limiting shaft necks are arranged in the middle of the sleeve; the sleeve is provided with a plurality of notches extending to the second end along the axis direction, and the notches are used for dividing the side wall of the sleeve into expansion pieces.

The invention is further improved in that: the inner hole of the sleeve is a tapered hole close to the first end of the sleeve and is used for accommodating a tapered bolt head of a tapered bolt; the inner hole is provided with an internal thread in the area close to the second end and is used for being connected with a screw rod of the conical bolt through the thread; the bolt head is a hexagon socket head, and the circumferential surface of the bolt head is provided with a taper.

The invention is further improved in that: the encoder clamping mechanism further comprises guide rods arranged on two sides of the V-shaped block, and the top ends of the two guide rods are provided with fixed seats positioned above the V-shaped block; the lower pressing block is arranged on the lower surface of the fixed seat through a pushing spring; and the base is provided with a mounting hole for fixedly connecting the V-shaped block and the guide rod.

The invention is further improved in that: at least three leveling jacks and a bubble device are arranged on the base.

The scheme provided by the invention has the following technical effects: the invention provides a multi-meter calibration device which can calibrate the design of an inclinometer, a polygon and an angle encoder calibration device. Whether the precision of the inclinometer is qualified or not and whether the precision of the encoder and the regular polygon is qualified or not are detected by using the high-precision encoder, so that the calibration of the inclinometer, the polygon and the encoder is realized, and the error in the calibration process is greatly reduced.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a perspective view of a multi-meter calibration device in a faceted prism calibration configuration;

FIG. 2 is a perspective view of the multi-meter calibration device in an encoder calibration configuration;

FIG. 3 is a perspective view of the multi-meter calibration apparatus in a faceted prism calibration configuration with the fixture hidden;

FIG. 4 is a perspective view of the sleeve;

FIG. 5 is a perspective view of the multi-meter calibration device in the encoder calibration configuration with the fixture hidden;

FIG. 6 is a side view of the multi-meter calibration device in the encoder calibration configuration with the fixture concealed;

FIG. 7 is a perspective view of the clamp;

FIG. 8 is another perspective view of the clamp;

FIG. 9 is a schematic view of a multi-gauge calibration apparatus when calibrating a level.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

Some exemplary embodiments of the invention have been described for illustrative purposes, and it is to be understood that the invention may be practiced otherwise than as specifically described.

As shown in fig. 1 and 2, the multi-meter calibration device of the present embodiment has two types, which can be used to calibrate an inclinometer, a polygon, and an angle encoder, respectively. The device includes:

a stepping motor 30 installed above the base 50;

a reference angle encoder 40 connected to a first end of a rotation shaft of the stepping motor 30 through a driving shaft 41;

a jig 300 installed at an end of the driving shaft 41 for holding the calibrated inclinometer;

the base 50 is also provided with a mounting position for mounting the polyhedral prism clamping component 100 or the encoder clamping mechanism 210;

the polygon clamp assembly 100 includes an expansion mandrel 110 for clamping the center hole of the polygon;

the encoder clamping mechanism 210 comprises a V-shaped block 211 with a V-shaped groove 212 arranged on the top surface and a lower pressing block 213 arranged above the V-shaped block 211 and used for pressing the encoder to be measured downwards and clamping the encoder to be calibrated;

the second end of the shaft of the stepper motor 30 is adapted to be coupled to the expansion mandrel 110 or the shaft of the encoder to be calibrated.

At least three leveling jacks and bubble devices are mounted on the base 50, and the platform can be leveled according to the positions of bubbles in the bubbles and the leveling jacks when the platform starts to be used.

As shown in fig. 1, 3 and 4, in order to detect a polygon, a polygon clamp assembly 100 is attached to the base 50. The faceted prism gripping assembly 100 further includes an L-shaped bracket; the base 50 is provided with a mounting hole for fixing the L-shaped bracket.

The polygon calibration mode of the present embodiment includes an expansion mandrel 110 for holding a polygon to be tested, a reference angle encoder 40 for detecting a rotation angle of the expansion mandrel 110, and a stepping motor for driving the expansion mandrel 110 and the reference angle encoder 40 to rotate.

As shown in fig. 3 and 4, the expansion mandrel 110 is used to grip the center hole of the polygon 199 to be measured by tensioning. The expansion mandrel 110 comprises a sleeve 111 and a conical bolt (not shown in the figures). The first end of the sleeve 111 fits into the central hole of the polygon 199 and is divided into expansion tabs 112. When the tapered bolt is screwed into the sleeve 111, each expansion sheet 112 is expanded to tighten the fixed polygon 199. The polygon 199 adopts the internal expanding type assembly method, adopts the basic shaft system, uses the conical bolt that screws in to cooperate with the sleeve 111 to carry out the self-centering tensioning clamping, can adjust the bloated tensioning force through turning round the conical bolt, guarantees the axiality of polygon and drive shaft, reduces the calibration error.

In some embodiments, a ring of raised restrictor journals 113 is provided in the middle of the sleeve 111. The limit journal 113 prevents axial play of the polygon 199 along the sleeve 111. The sleeve 111 is provided with three notches 114 extending to the second end along the axial direction for dividing the side wall of the sleeve 111 into three expansion sheets 112.

The internal bore of the sleeve 111 adjacent its first end is tapered 115, tapering from the end face of the first end of the sleeve to the cross-sectional diameter of the tapered bore. The tapered bore 115 is adapted to receive a tapered bolt head of a tapered bolt. The region of the inner bore adjacent the second end is in coaxial communication with the tapered bore 115 and is provided with an internal thread for threaded connection with the shank of the taper bolt. In this embodiment, the bolt head is a hexagon socket head, and the outer circumferential surface of the bolt head has a taper that fits the tapered hole 115.

The second end of the sleeve 111 is provided with a connecting rod 116 coaxial with the tapered bore. Both ends of the rotating shaft of the stepping motor 30 extend out of the housing to form a double-shaft output structure. The connecting rod 116 is used to connect with the first end of the rotating shaft of the stepping motor 30 through a coupling. The second end of the rotating shaft of the stepping motor 30 is drivingly connected to a driving shaft 41 through a coupling, and the driving shaft 41 is connected to the rotating shaft of the reference angle encoder 40. The above structure can ensure the coaxial accuracy of the sleeve 111, the stepping motor 30 and the reference angle encoder 40, thereby eliminating the relative error between the reference angle encoder 40 and the polygon 199 to be calibrated in the rotation process.

The reference angle encoder 40 is a high-precision absolute type angle encoder. The reference angle encoder 40 and the stepping motor 30 are electrically connected to the control module. In this embodiment, the control module is a single chip microcomputer. But the single chip microcomputer automatic control step motor rotates to read benchmark angle encoder 40's corner numerical value, can communicate with the host computer simultaneously, thereby realize the automatic calibration function of polyhedron arris body.

In this embodiment, the reference encoders are all mounted above the base 50 by L-shaped brackets.

In use, the polygon calibration configuration of the present embodiment is used in conjunction with an existing autocollimator to calibrate polygon 199. The auto-collimation method is to optically locate an object and an image on a conjugate plane, respectively. When the object rotates, the image point formed by the object on the image surface moves along with the object, the light beam is projected onto the object to be measured, and the rotating angle of the object can be obtained by measuring the moving amount of the image point.

In practice, the size and tolerance requirements of the drive shaft 41 are determined based on the size and tolerance requirements of the bore of the reference angle encoder 40, and the type of fit is selected. The installation step: install the L board at first on base 50, be connected the backup pad with the screw for the L board again, then install benchmark angle encoder 40 on the output shaft to compress tightly the assembly with gland nut to benchmark angle encoder 40, then assemble in the lump in the backup pad, be connected the backup pad with benchmark angle encoder 40 with the bolt, guarantee benchmark angle encoder 40 and drive shaft 41's axiality.

After the various components are mounted onto the work platform, the work platform is leveled. The stepping motor 30 is used as a drive, and the rotation angle of the stepping motor is controlled by the cooperation of the singlechip and the driver through the communication between the upper computer and the singlechip.

Installing an autocollimator, and simultaneously adjusting the correct position of a reticle of the autocollimator; adjustment of the axis perpendicularity of the autocollimator optical axis relative to the polygon 199 measurement axis; the autocollimator optical axis is adjusted to coincide with the center of the working surface of the polygon 199 (in the horizontal plane).

The method comprises the following specific operation steps: setting a working angle through an upper computer, operating the stepping motor 30, connecting the stepping motor 30 with the driving shaft 41 through a coupler, transferring power to the driving shaft 41 and driving the reference angle encoder 40 to rotate by the working angle; the other end of the stepping motor 30 is also connected to a coupler, the coupler transmits torque to the sleeve 111 of the expansion mandrel 110, and the expansion mandrel 110 is tightened by a tapered bolt to generate an internal expansion type tensioning effect, so as to drive the polygon 199 to rotate by a working angle. Taking a 24-sided prism as an example, a standard prism divides the circumference into 24 corners. During measurement, the rotation center of the prism is coincided with that of the calibrating device, and the optical axis of the autocollimator is adjusted to be perpendicular to the rotation axis of the calibrating device. The data measured by the reference angle encoder 40 is compared to the autocollimator reading to yield 24 deviations. According to the angle sealing principle, when the sum of all angle deviation values does not exceed 0.001 degrees, the polygon is qualified in calibration.

As shown in fig. 2, 5, and 6, an encoder clamping mechanism 210 is attached to the base 50 when detecting a polygon. In the detection process, the encoder clamping mechanism 210 clamps the detected angle encoder, the output shaft of the stepping motor 30 is used for driving the detected angle encoder and the reference angle encoder 40 to rotate synchronously under the driving of the control module, the control module can synchronously read the rotation angles detected by the reference angle encoder 40 and the detected angle encoder, and the detected value of the reference angle encoder 40 is used as a reference to calibrate the detected angle encoder.

Specifically, the encoder clamping mechanism 210 in this embodiment includes a V-shaped block 211 and a lower pressing block 213. The top surface of the V-shaped block 211 is provided with a V-shaped groove 212 with an upward opening, and the lower pressing block 213 is located above the V-shaped block 211. The encoder for the angle to be measured is generally cylindrical, and is placed in the V-shaped groove 212 in the test process, pressure is applied through the lower pressing block 213, the axis of the encoder for the angle to be measured is parallel to the two inclined surfaces of the V-shaped groove 212, and the circumferential surface of the encoder for the angle to be measured is respectively contacted with the two inclined surfaces of the V-shaped groove 212 and the bottom surface of the lower pressing block 213, so that a three-point fixing structure is formed.

In this embodiment, two sides of the V-shaped block 211 are respectively provided with a guide rod 214, and the top ends of the two guide rods 214 are provided with a fixing seat 215 located above the V-shaped block 211; the lower pressing block 213 is disposed on the lower surface of the fixing base 215 by the urging spring 216. The pushing spring 216 pushes the encoder to be measured downwards, so that the encoder is stably erected in the V-shaped groove 212, and coaxiality and jumping of the encoder during working are guaranteed. And the V-shaped blocks 211 with different specifications are adopted to ensure the coaxiality of the angle encoders with different sizes and the driving shaft.

In this embodiment, the V-shaped block 211 is inserted into the limiting block 217, and the limiting block 217 is fixedly connected to the upper surface of the base 50. The top of the stop block 217 is provided with a fixing groove matched with the bottom of the V-shaped block 211. By adopting the structure, the V-shaped block 211 with different specifications can be replaced by plugging.

In this embodiment, the bottom end of the guiding rod 214 is also fixedly connected to the limiting block 217. The two sides of the fixed seat 215 are fastened and connected with the top end of the guide rod 214 through nuts. A guide rod is further disposed between the lower surface of the fixing seat 215 and the lower pressing block 213, and the pushing spring 216 surrounds the guide rod. The guide rod can ensure that the limiting block 217 vertically and downwards presses the encoder to be measured.

The measured angle encoder and the reference angle encoder 40 are synchronously driven by the stepping motor 30. The stepping motor 30 is a biaxial stepping motor, and both ends of a rotating shaft thereof extend from the housing. One end of the rotary shaft is used for directly connecting with the rotary shaft of the measured angle encoder, and the other end is connected with the reference angle encoder 40 through the driving shaft 41.

In the present embodiment, the reference angle encoder 40 is mounted above the base 50 by an L-shaped bracket. In the present embodiment, the reference angle encoder 40 is an absolute encoder, and the output thereof is usually a binary code or BCD code. The positive and negative directions and the position of displacement can be judged from the change of the code number, and the absolute zero code can also be used for power failure position memory. The encoder is characterized in that the absolute value of the angle coordinate can be directly read; no accumulated error; the position information is not lost after the power supply is cut off.

The reference angle encoder 40 is attached in the following manner: the housing is secured to the support plate 42 by its own mounting flange and centering ring. The center of the reference angle encoder 40 is provided with a coupling with a ring nut, which is a through-hole shaft. The coupling of the reference angle encoder 40 is fitted to the drive shaft 41 and fixed by a ring nut on the front surface of the reference angle encoder 40.

During installation of the reference angle encoder 40: firstly, the L-shaped bracket is arranged on the base 50, then the support plate 42 is connected with the L-shaped bracket through screws, then the reference angle encoder 40 is arranged on the driving shaft 41, the reference angle encoder 40 is assembled in a pressing mode through a pressing nut, then the reference angle encoder is assembled on the support plate 42, the support plate 42 is connected with the reference angle encoder 40 through bolts, and finally the bearing on the driving shaft 41 is fixed through a bearing pressing cover. The installation mode ensures the coaxiality precision of the high-precision reference angle encoder 40 relative to the driving shaft 41, and reduces the error of the calibration process.

In the present embodiment, the driving shaft 41 of the reference angle encoder 40 is coaxially connected to the stepping motor 30 and the rotation shaft of the measured angle encoder, and the three are connected by a coupling. The three parts can synchronously rotate by the mode, so that the relative error between the high-precision encoder and the encoder in the rotating process is eliminated.

In this embodiment, the axis of the rotating shaft of the stepping motor 30 is parallel to the two inclined planes of the V-shaped groove 212, and the position and the included angle of the two inclined planes of the V-shaped groove 212 make the axis of the measured angle encoder coaxial with the rotating shaft of the stepping motor 30. The V-shaped block 211 may be made of cast iron, and its respective surfaces may be finely ground to ensure its machining accuracy.

The control module adopts a single chip microcomputer as a controller, and the single chip microcomputer can generate pulses to drive the stepping motor 30 to rotate by a preset angle and read the output angles of the reference angle encoder 40 and the measured angle encoder. The control module can also communicate with an upper computer to set a calibration angle, so that the function of automatically calibrating the angle encoder is realized.

The method for calibrating the encoder by adopting the scheme of the embodiment comprises the following steps: and selecting a corresponding V-shaped block 211 according to the outer diameter of the measured angle encoder, and installing the measured angle encoder between the V-shaped block 211 and the lower pressing block 213. One end of the rotating shaft of the stepping motor 30 is connected to the driving shaft 41 of the driving reference angle encoder 40, and the other end is directly connected to the rotating shaft of the angle encoder to be measured through a coupling. The upper computer sets a calibration point to send a signal, and the control module receives an instruction to control the stepping motor 30 to rotate by a set angle. When the stepping motor 30 works, one end of the stepping motor transfers torque to the driving shaft 41 through the coupler, and the driving shaft 41 drives the reference angle encoder 40 to rotate by the same angle; the other end is directly connected with the angle encoder to be tested through the coupler to transmit torque, and the angle encoder to be tested is driven to rotate by the same angle. In the measurement and correction process, the reference angle encoder 40 and the rotating shaft of the measured angle encoder are connected coaxially, rotate synchronously and smoothly, and the readings of the two angle encoders are compared so as to calculate the indexing error of the measured angle encoder.

The device of the embodiment can adapt to various specifications of the tested sample in the measuring process, and meanwhile, the automation of the calibration process is realized. The device can realize the calibration of the angle encoders with various specifications, and greatly reduces the error in the calibration process.

As shown in fig. 7, 8, and 9, when detecting an inclinometer, a polygon calibration mode or an encoder calibration mode of the multi-meter calibration device may be used. The clamp 300 is installed at the end of the driving shaft 41, the clamp 300 is used for clamping the inclinometer during the calibration process of the inclinometer and is connected with a driving shaft 41, the stepping motor 30 connected with the driving shaft 41 can drive the clamp to drive the inclinometer to rotate by a preset angle, and the reading of the inclinometer is compared with the rotation angle of the driving shaft 41, so that the error of the inclinometer is obtained.

The clamp 300 of the present embodiment is in a cradle structure, which includes: core plate 310, pallet 312, side plates 314, pressure plate 315, hold down plate 316, and a drive mechanism. The core board 310 is vertically disposed, and a rotation shaft connecting portion 311 is disposed at the center thereof. The hinge coupling portion 311 includes coupling holes perpendicular to the front surface of the core plate 310 and a hoop at an end of the coupling holes for fastening the driving shaft 41.

The plate 312 is laterally disposed on the bottom of the core plate 310 and has an upper surface for holding an inclinometer to be calibrated. The upper surface of the supporting plate 312 is provided with at least two horizontal spring slider assemblies 313; the horizontal spring slider assemblies 313 are divided into two groups, which respectively push the inclinometers from the two side surfaces to form a clamping structure.

In one embodiment, the number of horizontal spring slide assemblies 313 is two, and two horizontal spring slide assemblies 313 are located on opposing front and back sides of inclinometer 398 for pushing against the front and back sides of inclinometer 398. Each horizontal spring-slide assembly 313 includes a slide that is urged by a thrust spring, and each horizontal spring-slide assembly 313 provides a preliminary grip for inclinometer 398 during use.

The side plates 314 are vertically connected to the upper surface of the pallet 312 and the core plate 310, respectively. The pressure plate 315 is parallel to the side plate 314, the side plate 314 and the pressure plate 315 being located on either side of the inclinometer to be calibrated. The pressing plate 316 is arranged between the side plate 314 and the pressing plate 315, a plurality of pushing springs 317 are arranged between the pressing plate and the inner side surface of the pressing plate 315, and the pushing springs 317 are used for pushing the pressing plate 316 towards the side plate 314, so that the pressing plate 316 and the side plate 314 are matched to form a clamping structure for clamping two end surfaces of the inclinometer. The urging spring 317 has a stiffness of at least 1.2N/mm.

In this embodiment, the distance between the pressing plate 315 and the side plate 314 is controlled by a driving mechanism. The driving mechanism is connected between the core plate 310 and the pressing plate 315, and is used for driving the side plate pressing plate 315 to drive the pressing plate 316 to move towards the side plate 314, so that the pressing plate 315 and the side plate 314 respectively push two ends of the inclinometer to form a clamping mechanism. In this embodiment, the driving mechanism can be controlled by the control module to adjust the distance between the pressing plate 315 and the side plate 314, and further adjust the contraction length of each pushing spring 317 and the clamping force of the pressing plate 316 on the inclinometer 398, so that the clamping force of the clamp can be flexibly adjusted on inclinometers with different lengths, the inclinometer 398 is prevented from moving due to too small clamping force, and the deformation accuracy of the inclinometer is also prevented from being reduced due to too large clamping force.

In this embodiment, opposite sides of the hold-down plate 316 and the side plate 314 are each provided with a vertical spring-block assembly 318 that is biased downwardly and is configured to cooperate with the retainer plate 312 to form a clamping structure. The vertical spring slide assembly 318 is similar in construction to the horizontal spring slide assembly 313, differing only in the direction of the thrust.

In this embodiment, four optical axes 319 are fixedly disposed on the side plate 314; each optical axis 319 is parallel to the upper surface of the carrier 312. The pressing plate 315 and the pressing plate 316 are each provided with a sleeve adapted to the optical axis 319, and are slidably disposed on each optical axis 319 through the sleeve. The pushing springs 317 between the pressing plate 315 and the pressing plate 316 respectively surround the optical axes 319. Each optical axis 319 may serve as a guide.

The pressing plate 315 is slidably disposed on the slide rail of the core plate 310 through two sliding blocks 320; the two rails are parallel to the upper surface of the pallet 312. The driving mechanism comprises a direct current motor 321, a motor mounting rack 322, a coupler 323, a clamp screw rod 324 and a nut connecting piece 325; the dc motor 321 is installed on one side of the core board 310 through the motor mounting bracket 322; the clamp screw rod 324 is parallel to the upper surface of the supporting plate 312 and is in transmission connection with an output shaft of the direct current motor 321 through a coupler 323; the nut coupler 325 is mounted on the clamp screw 324 and is fixedly coupled to the pressure plate 315. When the dc motor 321 rotates, the shaft thereof drives the clamp screw 324 to rotate through the coupling 323, and the clamp screw 324 drives the pressing plate 315 to slide along the optical axis 319 through the nut connecting member 325 during the rotation process. During the sliding process, the pressing plate 315 can slide along the pressing plate 316 by pushing the springs 317.

In order to accurately control the position of the pressing plate 315, the dc motor 321 is electrically connected to the control module, in this embodiment, the dc motor 321 is a permanent magnet dc motor, and the control module can detect the rotation angle of the dc motor 321 through a back electromotive force. The core board 310 is provided with a travel switch electrically connected to the control module and located at the end of the travel of the pressure plate 315, so as to prevent the core board 310 from colliding with other components due to failure of the control module.

To facilitate automatic acquisition of calibration results, camera mounts 326 are provided on the top surface of the core board 310 and on the pallet 312. By mounting the camera on the camera mount 326, a reading image of the inclinometer can be automatically acquired. The camera mounting base 326 can slide along the sliding groove on the edge of the core board 310 or the supporting board 312, and the mounting position of the camera mounting base can be adjusted according to the position of the inclinometer in the using process, so that the camera reading position can be conveniently adjusted.

When the measured sample is a biaxial digital display inclinometer, the biaxial digital display inclinometer rotates around the working shaft in the measuring process, the uniaxial measuring equipment can display the rotated angle beta when rotating around the x axis, and the biaxial measuring equipment can simultaneously display the rotated angles beta and alpha when rotating around the x axis and the y axis. To meet the requirements of the actual measurement, the fixture can hold the sample in both the y-direction and the direction perpendicular to the x-y plane. The horizontal spring sliding block assembly 313 and the vertical spring sliding block assembly 318 are arranged, so that the clamping is convenient during calibration, the adjustment is quick, the centering performance is strong, and the device is suitable for clamping angle instruments of various sizes and types.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A multi-meter calibration device, comprising:

the stepping motor is arranged above the base;

2. A multi-meter calibration device according to claim 1 wherein said fixture comprises:

the core plate is vertically arranged, and a rotating shaft connecting part is arranged in the center of the core plate;

the pressing plate is parallel to the side plate;

3. A multi-meter calibration device according to claim 2, wherein:

at least three optical axes are fixedly arranged on the side plate; each optical axis is parallel to the upper surface of the supporting plate; the pressing plate and the pressing plate are arranged on each optical axis in a sliding mode; the pushing springs between the pressing plate and the pressing plate are respectively surrounded on the optical axes;

4. The multi-meter calibration device of claim 2, wherein the drive mechanism comprises a dc motor, a motor mount, a coupling, a clamp screw, and a nut connector; the direct current motor is arranged on one side of the core plate through a motor mounting frame; the clamp screw rod is parallel to the upper surface of the supporting plate and is in transmission connection with an output shaft of the direct current motor through a coupler; the nut connecting piece is arranged on the clamp screw rod and is fixedly connected with the pressing plate.

5. A multi-meter calibration device according to claim 1, wherein:

the polyhedral edge clamping assembly also comprises an L-shaped bracket; the base is provided with a mounting hole for fixing the L-shaped bracket in advance; the multi-surface prism clamping assembly is arranged above the base through the L-shaped bracket;

the expansion mandrel comprises a sleeve and a taper bolt; the first end of the sleeve is matched with the central hole of the polyhedral prism body and is divided into a plurality of expansion pieces; when the conical bolt is screwed into the sleeve, the expansion pieces are opened so as to tension and fix the polyhedral pyramid.

6. A multi-meter calibration device according to claim 5, wherein: a circle of raised limiting shaft necks are arranged in the middle of the sleeve; the sleeve is provided with a plurality of notches extending to the second end along the axis direction, and the notches are used for dividing the side wall of the sleeve into expansion pieces.

7. A multi-meter calibration device according to claim 5, wherein: the inner hole of the sleeve is a tapered hole close to the first end of the sleeve and used for accommodating a tapered bolt head of a tapered bolt; the inner hole is provided with an internal thread in the area close to the second end and is used for being connected with a screw rod of the conical bolt through the thread; the bolt head is a hexagon socket head, and the circumferential surface of the bolt head is provided with a taper.

8. A multi-meter calibration device according to claim 1, wherein: the encoder clamping mechanism further comprises guide rods arranged on two sides of the V-shaped block, and the top ends of the two guide rods are provided with fixed seats positioned above the V-shaped block; the lower pressing block is arranged on the lower surface of the fixed seat through a pushing spring; and the base is provided with a mounting hole for fixedly connecting the V-shaped block and the guide rod.

9. A multi-meter calibration device according to claim 1, wherein: at least three leveling jacks and a bubble device are arranged on the base.