CN114543837B

CN114543837B - Calibrating device for multiple meters

Info

Publication number: CN114543837B
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: 2023-06-30
Anticipated expiration: 2042-02-11
Also published as: CN114543837A

Abstract

The invention discloses a calibrating device of a multi-meter, which comprises: the stepping motor is arranged above the base; the reference angle encoder is connected with the first end of the 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 the polyhedral clamping assembly or the encoder clamping mechanism; the polyhedral clamping assembly comprises an expansion mandrel for clamping a central hole of the polyhedral; the encoder clamping mechanism is used for clamping the 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 utilizes the high-precision encoder to detect 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, thereby realizing the calibration of the inclinometer, the polygon and the encoder and greatly reducing the error in the calibration process.

Description

Calibrating device for multiple meters

Technical Field

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

Background

Currently existing devices are only single function and are manually calibrated. In the detection process, the dead weight of the clamp drives the rotating shaft to enable stable reading and reading to be more difficult, and currently, the uncertainty of manual angle positioning measurement is 0.005 degrees. This results in the laboratory in calibrating samples with a resolution of 0.01 ° or more, the effect of human factors on the measurement results is amplified. At the same time, the efficiency of the current calibration work is not high, and the time for conventionally measuring one device is about 20 minutes. With the increase of the traffic, the drawbacks of manual calibration are increasingly prominent. Meanwhile, the shape and the weight of the clamp of the existing calibrating device are large, and large moment is generated in rotation, so that inconvenience is caused to the operation of detection personnel. Meanwhile, the appearance of samples sent by customers is various, and the limitations of the prior clamp in use are more remarkable.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention aims to propose a new calibration device for a multi-meter, which is capable of automatically visualizing a multifunctional integration of data operations. Based on relevant regulations and specifications, under the condition of meeting sample calibration requirements, the lightweight design of the device is completed, the automatic calibration of the digital display angle meter calibration device is realized, and the detection efficiency is improved.

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

the stepping motor is arranged above the base;

the reference angle encoder is connected with the first end of the 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 the polyhedral clamping assembly or the encoder clamping mechanism;

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

the encoder clamping mechanism comprises a V-shaped block with a V-shaped groove on the top surface and a lower pressing block arranged above the V-shaped block and used for pressing down the measured angle encoder, 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 further improves that: the clamp comprises: the core plate is vertically arranged, and a rotating shaft connecting part is arranged in the center;

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 sliding block assembly is 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;

a platen 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 is 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 the two ends of the inclinometer to form a clamping mechanism;

the pressing plate and the opposite side surfaces of the side plates are respectively provided with a vertical spring sliding block assembly which is pushed downwards and used for being matched with the supporting plate to form a clamping structure.

The invention further improves 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 plates and the pressing plates are arranged on the optical axes in a sliding manner; the pushing springs between the pressing plate and the pressing plate are respectively surrounded on the optical axes;

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

The invention further improves that: the driving mechanism comprises a direct current motor, a motor mounting rack, 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 fixture 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 fixedly connected with the pressing plate.

The invention further improves that:

the polyhedral clamping assembly also comprises an L-shaped bracket; the base is preset with a mounting hole for fixing the L-shaped bracket; the polyhedral clamping assembly is arranged above the base through the L-shaped bracket;

the expansion mandrel comprises a sleeve and a conical bolt; the first end of the sleeve is matched with the central hole of the polyhedron and is divided into a plurality of expansion sheets; when the conical bolts are screwed into the sleeve, the expansion sheets are expanded to tightly expand and fix the polyhedral prism;

the invention further improves that: the middle part of the sleeve is provided with a circle of raised limit shaft neck; the sleeve is provided with a plurality of notches extending to the second end along the axial direction, and the notches are used for separating the side wall of the sleeve into expansion sheets.

The invention further improves that: the inner hole of the sleeve is a conical hole adjacent to the first end of the sleeve and is used for accommodating the conical bolt head of the conical bolt; the inner hole is provided with an inner thread in a region close to the second end and is used for being connected with a screw rod of the conical bolt through threads; the bolt head is an inner hexagon bolt head, and the circumference surface of the inner hexagon bolt head is provided with taper.

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

The invention further improves 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 calibrating device for a multi-meter, which can calibrate the design of calibrating devices for inclinometers, polyhedrons and angle encoders. The high-precision encoder is used for detecting whether the precision of the inclinometer is qualified or not and whether the precision of the encoder and the precision of the regular polygon are qualified or not, 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, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.

Drawings

FIG. 1 is a perspective view of a multi-meter calibration device in a polyhedral prismatic 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 device with the clamp removed in a polyhedral calibration configuration;

FIG. 4 is a perspective view of the sleeve;

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

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

FIG. 7 is a perspective view of the clamp;

FIG. 8 is another perspective view of the clamp;

FIG. 9 is a schematic diagram of a multi-meter calibration device when calibrating a level.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the illustrations, not according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

Some exemplary embodiments of the invention have been described for illustrative purposes, it being understood that the invention may be practiced otherwise than as specifically shown in the accompanying drawings.

As shown in fig. 1 and 2, the calibrating device for multi-meter of the present embodiment has two forms, which can be used for calibrating inclinometers, polyhedral prisms, and angle encoders, respectively. The device comprises:

a stepping motor 30 mounted above the base 50;

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

a clamp 300 mounted on an end of the driving shaft 41 for clamping the calibrated inclinometer;

the base 50 is also provided with a mounting position for mounting the polygon clamping assembly 100 or the encoder clamping mechanism 210;

the polyhedral clamping assembly 100 comprises an expansion mandrel 110 for clamping the central aperture of the polyhedral prism;

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

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

At least three leveling jacks and a bubble device are mounted on the base 50, and the platform can be leveled according to the bubble position in the bubble and the leveling jacks when the platform starts to be used.

As shown in fig. 1, 3, and 4, a polygon clamping assembly 100 is mounted on the base 50 when detecting a polygon. The polyhedral clamping assembly 100 also comprises an L-shaped bracket; the base 50 is pre-provided with mounting holes for fixing the L-shaped bracket.

The polygon calibration form of the present embodiment includes an expansion mandrel 110 for holding a polygon to be measured, a reference angle encoder 40 for detecting the 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 clamp the central hole of the measured polygon 199 by tensioning. The expansion mandrel 110 comprises a sleeve 111 and a taper bolt (not shown in the figures). The first end of the sleeve 111 fits into the central bore of the polygon 199 and is divided into a plurality of expansion tabs 112. When the taper bolts are screwed into the sleeve 111, the expansion pieces 112 are spread apart to tighten the polygon 199. The polygon 199 is assembled by internal expansion, a base shaft is adopted, the screwed conical bolts are matched with the sleeve 111 to carry out self-centering tensioning clamping, the expanding tensioning force can be adjusted through the screwed conical bolts, the coaxiality of the polygon and the driving shaft is ensured, and the calibration error is reduced.

In some embodiments, the middle of the sleeve 111 is provided with a raised circle of stop journals 113. The limit journals 113 prevent 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 pieces 112.

The inner bore of the sleeve 111 is tapered 115 adjacent its first end, with a progressively smaller cross-sectional diameter from the end of the first end of the sleeve to the inner tapered bore. The tapered bore 115 is adapted to receive the tapered bolt head of a tapered bolt. The region of the bore adjacent the second end is in coaxial communication with the tapered bore 115 and is provided with internal threads for threaded engagement with the shank of the tapered bolt. In this embodiment, the bolt head is an inner hexagon bolt head, and the outer circumference surface of the bolt head has a taper matching the taper hole 115.

The second end of the sleeve 111 is provided with a connecting rod 116 coaxial with the conical bore. Both ends of the rotating shaft of the stepping motor 30 extend out of the housing to form a biaxial output structure. The connecting rod 116 is adapted to be coupled to a first end of the shaft of the stepper motor 30 via a coupling. The second end of the rotation shaft of the stepping motor 30 is drivingly connected to a drive shaft 41 through a coupling, and the drive shaft 41 is connected to the rotation shaft of the reference angle encoder 40. The above structure can ensure the coaxial precision of the sleeve 111, the stepping motor 30 and the reference angle encoder 40, thereby eliminating the relative error in the rotation process of the reference angle encoder 40 and the calibrated polygon 199.

The reference angle encoder 40 is a high-precision absolute angle encoder. The reference angle encoder 40 and the stepper motor 30 are electrically connected to the control module. In this embodiment, the control module is a single-chip microcomputer. The singlechip can automatically control the rotation of the stepping motor, reads the corner value of the reference angle encoder 40, and can communicate with the upper computer at the same time, thereby realizing the automatic calibration function of the polyhedron.

In this embodiment, the reference encoders are each mounted above the base 50 by an L-shaped bracket.

In use, the polygon 199 is calibrated by the polygon calibration configuration of the present embodiment in combination with the existing autocollimator. Auto-collimation is the optical positioning of an object and an image in 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 rotation angle of the object can be obtained by measuring the movement amount of the image point.

In the implementation, the size and tolerance requirements of the drive shaft 41 are determined according to the size and tolerance requirements of the hole of the reference angle encoder 40, and the fit type is selected. The installation step comprises the following steps: the L plate is firstly mounted on the base 50, then the support plate is connected with the L plate by bolts, then the reference angle encoder 40 is mounted on the output shaft, the reference angle encoder 40 is pressed and assembled by using a pressing nut, then the L plate and the reference angle encoder 40 are assembled together on the support plate, the support plate is connected with the reference angle encoder 40 by using bolts, and the coaxiality of the reference angle encoder 40 and the driving shaft 41 is ensured.

After the various components are mounted to the work platform, the work platform is leveled. The stepper motor 30 is used as a drive, and the rotation angle of the stepper 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 adjusting the accurate position of a reticle; adjustment of the autocollimator optical axis to measure the axis perpendicularity with respect to the polygon 199; the autocollimator optical axis is aligned coincident (in the horizontal plane) with the center of the working face of the polygon 199.

The specific operation steps are as follows: setting a working angle through an upper computer, running a stepping motor 30, connecting the stepping motor 30 with a driving shaft 41 through a coupler, transferring power to the driving shaft 41 and driving a reference angle encoder 40 to rotate the working angle; the other end of the stepping motor 30 is also connected with a coupling, torque is transmitted to the sleeve 111 of the expansion mandrel 110 through the coupling, and the expansion mandrel 110 generates an internal expansion type tensioning effect through screwing of a conical bolt 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 overlapped with the rotation center of the calibrating device, and the optical axis of the auto-collimator is adjusted to be perpendicular to the rotation axis of the calibrating device. The reference angle encoder 40 measured data is compared to the autocollimator readings to obtain 24 deviations. And according to the angle closing principle, when the sum of all angle deviation values is not more than 0.001 degrees, the polygon is calibrated to be qualified.

As shown in fig. 2, 5, and 6, the encoder clamping mechanism 210 is mounted on 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 stepper motor 30 is used for driving the detected angle encoder and the reference angle encoder 40 to synchronously rotate under the driving of the control module, and the control module can synchronously read the reference angle encoder 40 and the rotation angle detected by the detected angle encoder, and calibrate the detected angle encoder by taking the detection value of the reference angle encoder 40 as a reference.

Specifically, the encoder clamping mechanism 210 in this embodiment includes a V-shaped block 211 and a 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 a lower pressing block 213 is positioned above the V-shaped block 211. The measured angle encoder is generally cylindrical, and is placed in the V-shaped groove 212 and applies pressure through the pressing block 213 during the test, at this time, the axis of the measured angle encoder is parallel to the two inclined planes of the V-shaped groove 212, and the circumferential surfaces of the measured angle encoder are respectively contacted with the two inclined planes of the V-shaped groove 212 and the bottom surface of the pressing block 213, so as to form a three-point fixing structure.

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

In this embodiment, the V-shaped block 211 is inserted into the limiting block 217, and the limiting block 217 is fixedly connected with the upper surface of the base 50. The top of stopper 217 is provided with the fixed slot of the bottom looks adaptation of V type piece 211. With this structure, the V-shaped blocks 211 of different specifications can be replaced by plugging.

In this embodiment, the bottom end of the guide rod 214 is also fixedly connected with the limiting block 217. Two sides of the fixed seat 215 are fixedly connected with the top end of the guide rod 214 through nuts. A guide rod is further arranged between the lower surface of the fixed seat 215 and the lower pressing block 213, and the pushing spring 216 surrounds the guide rod. The guide bar ensures that the stop block 217 presses the measured angular encoder vertically downward.

The measured angle encoder and the reference angle encoder 40 are synchronously driven by the stepping motor 30. The stepper motor 30 is a biaxial stepper motor, and both ends of its rotating shaft extend from the housing. One end of the rotation shaft is directly connected to the rotation shaft of the measured angle encoder, and the other end is connected to the reference angle encoder 40 through a driving shaft 41.

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

The reference angle encoder 40 is mounted in the following manner: the housing is secured to the support plate 42 by a self-contained 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 coupled to the driving shaft 41 and is fixed by a ring nut on the front surface of the reference angle encoder 40.

During the installation of the reference angle encoder 40: the L-shaped bracket is firstly mounted on the base 50, then the support plate 42 is connected with the L-shaped bracket by bolts, then the reference angle encoder 40 is mounted on the driving shaft 41, the reference angle encoder 40 is pressed and assembled by using a compression nut, then the reference angle encoder 40 is assembled on the support plate 42, the support plate 42 is connected with the reference angle encoder 40 by using bolts, and finally the bearing on the driving shaft 41 is fixed by using a bearing gland. Such mounting ensures the accuracy of the coaxiality of the high-precision reference angle encoder 40 with respect to the drive shaft 41, reducing errors in the calibration process.

In this embodiment, a driving shaft 41 on the reference angle encoder 40 is coaxially connected with the stepper motor 30 and the rotation shaft of the measured angle encoder, and these three are connected by a coupling. By the method, the three can synchronously rotate, so that relative errors in the rotation process of the high-precision encoder and the encoder are eliminated.

In this embodiment, the axis of the rotating shaft of the stepper motor 30 is parallel to the two inclined planes of the V-shaped groove 212, and the positions and the included angles 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 stepper motor 30. The V-block 211 may be made of cast iron, and each surface thereof may be refined to ensure its machining accuracy.

The control module adopts a singlechip as a controller, and the singlechip can generate pulses to drive the stepping motor 30 to rotate a preset angle and read the output angles of the reference angle encoder 40 and the measured angle encoder. The control module can also be communicated with the upper computer to set the 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: the corresponding V-block 211 is selected according to the outer diameter of the measured angle encoder, and the measured angle encoder is installed between the V-block 211 and the pressing down block 213. One end of the rotation shaft of the stepping motor 30 is connected to a drive shaft 41 that drives the reference angle encoder 40, and the other end is directly connected to the rotation shaft of the measured angle encoder via a coupling. The upper computer sets the calibration point to send a signal, and the control module controls the stepping motor 30 to rotate by a set angle after receiving the instruction. 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 measured through a coupler to carry out torque transmission, and the angle encoder to be measured is driven to rotate by the same angle. In the measuring and correcting process, the reference angle encoder 40 is coaxially connected with the rotating shaft of the measured angle encoder, synchronously and smoothly rotates, 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 measured sample in the measuring process, and meanwhile, the automation of the calibrating process is realized. The device can realize the calibration of the angle encoders with various specifications and greatly reduce the error in the calibration process.

As shown in fig. 7, 8, and 9, the multi-faceted prism calibration configuration or the encoder calibration configuration of the multi-gauge calibration device may be used in detecting inclinometers. The fixture 300 is installed at the end of the driving shaft 41, the fixture 300 is used for clamping the inclinometer during the inclinometer calibration process and is connected with a driving shaft 41, and the stepping motor 30 connected with the driving shaft 41 can drive the fixture to drive the inclinometer to rotate by a preset angle and compare the reading of the inclinometer with the rotation angle of the driving shaft 41, so that the error of the inclinometer is obtained.

The fixture 300 of this embodiment is in a cradle configuration, comprising: core plate 310, pallet 312, side plates 314, pressure plate 315, hold down plate 316, and drive mechanism. The core plate 310 is vertically disposed with a rotation shaft connection part 311 at the center thereof. The rotating shaft connecting portion 311 includes a connecting hole perpendicular to the front surface of the core plate 310 and a hoop at an end of the connecting hole for fastening connection with the driving shaft 41.

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

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

The side plates 314 are vertically connected to the upper surfaces of the pallets 312 and the core plate 310, respectively. The pressure plate 315 is parallel to the side plate 314, and the side plate 314 and the pressure plate 315 are located on both sides of the inclinometer to be calibrated. The pressing plate 316 is disposed between the side plate 314 and the pressing plate 315, and a plurality of pushing springs 317 are disposed between the pressing plate 315 and the inner side surface of the pressing plate 314, and the pushing springs 317 are used for pushing the pressing plate 316 toward the side plate 314, so that the pressing plate 316 and the side plate 314 cooperate to form a clamping structure for clamping two end surfaces of the inclinometer. The stiffness of the ejector spring 317 is at least 1.2N/mm.

In the present 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 the two ends of the inclinometer to form a clamping mechanism. In this embodiment, the driving mechanism can be controlled by the control module, so as 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 can be flexibly adjusted on inclinometers with different lengths by the clamp, the movement of the inclinometer 398 caused by too small clamping force can be avoided, and the deformation precision reduction of the inclinometer caused by too large clamping force can be avoided.

In this embodiment, the hold down plate 316 and the opposite side of the side plate 314 are each provided with a vertical spring slide assembly 318 that pushes downwardly and is adapted to cooperate with the support plate 312 to form a clamping structure. The vertical spring slider assembly 318 is similar in structure to the horizontal spring slider assembly 313, with only the thrust direction being different.

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 fitted with 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 are respectively wound around the respective optical axes 319. Each optical axis 319 may serve as a guide.

The pressing plate 315 is slidably arranged on the sliding 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 frame 322, a coupler 323, a clamp screw 324 and a nut connector 325; the direct current motor 321 is installed at one side of the core plate 310 through a motor installation frame 322; the clamp screw 324 is parallel to the upper surface of the supporting plate 312 and is in transmission connection with the output shaft of the direct current motor 321 through a coupler 323; the nut connector 325 is mounted on the clamp screw 324 and fixedly connected to the pressure plate 315. When the direct current motor 321 rotates, the rotating shaft drives the clamp screw 324 to rotate through the coupler 323, and the clamp screw 324 drives the pressing plate 315 to slide along the optical axis 319 through the nut connector 325 in the rotating process. In the sliding process, the pressing plate 315 can drive the pressing plate 316 to slide through the pushing spring 317.

In order to precisely control the position of the pressing plate 315, the dc motor 321 is electrically connected to a 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 by using a reverse electromotive force. The core board 310 is provided with a travel switch electrically connected to the control module and located at the end of travel of the pressing plate 315, so as to avoid the impact between the core board 310 and other components caused by failure of the control module.

In order to facilitate automatic collection of calibration results, camera mounts 326 are provided on the top surface of the core plate 310 and on the pallet 312. By mounting the camera on the camera mount 326, a readout image of the inclinometer can be automatically acquired. The camera mounting seat 326 can slide along the sliding groove at the edge of the core plate 310 or the supporting plate 312, and the mounting position of the camera mounting seat can be adjusted according to the position of the inclinometer during use, so as to conveniently adjust the reading position of the camera.

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

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. A multi-meter calibration device, comprising:

the stepping motor is arranged above the base;

the polyhedral clamping assembly comprises an expansion mandrel for clamping a central hole of the polyhedral; the polyhedral clamping assembly further comprises an L-shaped bracket; the base is preset with a mounting hole for fixing the L-shaped bracket; the polyhedral clamping assembly is arranged above the base through the L-shaped bracket; the expansion mandrel comprises a sleeve and a conical bolt; the first end of the sleeve is matched with the central hole of the polyhedron and is divided into a plurality of expansion sheets; when the conical bolts are screwed into the sleeve, the expansion sheets are expanded to tightly expand and fix the polyhedral prism;

the encoder clamping mechanism comprises a V-shaped block with a V-shaped groove on the top surface and a lower pressing block arranged above the V-shaped block and used for pressing down the measured angle encoder, and is used for clamping the encoder to be calibrated; the encoder clamping mechanism further comprises guide rods arranged on two sides of the V-shaped block, and fixing seats positioned above the V-shaped block are arranged at the top ends of the two guide rods; the lower pressing block is arranged on the lower surface of the fixed seat through a pushing spring; the base is provided with a mounting hole for fixedly connecting the V-shaped block and the guide rod;

the second end of the rotating shaft of the stepping motor is connected with the expansion mandrel or the rotating shaft of the encoder to be calibrated;

the clamp comprises:

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

a platen parallel to the side plate;

2. A multi-meter calibration device as defined in claim 1, wherein:

3. The multi-meter calibration assembly of claim 1 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 fixture 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 fixedly connected with the pressing plate.

4. A multi-meter calibration device as defined in claim 1, wherein: the middle part of the sleeve is provided with a circle of raised limit shaft neck; the sleeve is provided with a plurality of notches extending to the second end along the axial direction, and the notches are used for separating the side wall of the sleeve into expansion sheets.

5. A multi-meter calibration device as defined in claim 1, wherein: the inner hole of the sleeve is a conical hole adjacent to the first end of the sleeve and is used for accommodating the conical bolt head of the conical bolt; the inner hole is provided with an inner thread in a region close to the second end and is used for being connected with a screw rod of the conical bolt through threads; the bolt head is an inner hexagon bolt head, and the circumference surface of the inner hexagon bolt head is provided with taper.

6. A multi-meter calibration device as defined in claim 1, wherein: at least three leveling jacks and a bubble device are arranged on the base.