Automatic gauge block calibrating device and calibrating method

Abstract

The invention discloses an automatic gauge block calibrating device and method, and the device is used for the automatic calibration of a 0.5-150mm gauge block, the device comprises a mounting seat, a bearing platform and a cantilever, the mounting seat is provided with a Z-axis guide rail, the cantilever is slidably arranged on the Z-axis guide rail, the cantilever is provided with a measuring rod guide rail, the bearing platform is provided with a five-rib workbench for bearing the gauge block, and the five-rib workbench is provided with a clamping groove. The five workbenches are positioned below the measuring rod guide rail; a measuring head is arranged on the measuring rod guide rail and comprises a probe, an upper magnetizer and a lower magnetizer, the upper magnetizer and the lower magnetizer are arranged at intervals to form an air wedge, the upper magnetizer is sleeved with an induction coil, the lower magnetizer is fixedly connected with the probe, and the probe and the five-rib workbench are oppositely arranged. According to the invention, the high-stability mechanical workbench and the precise frequency type inductive displacement sensor are adopted, so that the micro size change of the gauge block can be accurately captured, and the accuracy and reliability of measured data are ensured; the device is provided with a heat screen, so that the interference of environment temperature change on a measurement result is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of precision gauge block calibration technology, and more specifically, to an automated gauge block calibration device and calibration method. Background Technology

[0002] With the development of information technology and opto-mechatronics integration and systematization, measurement technology and instruments are also developing towards higher precision, higher efficiency, intelligence, integration, and non-contact methods. Although geometric measurement technology belongs to the traditional field of metrology, the rise of higher metrological requirements such as on-site metrology, in-situ metrology, and field metrology has placed higher demands on the portability and integration of geometric measurement instruments while ensuring high accuracy. Because geometric measurement instruments generally have high measurement accuracy, and are limited by the mechanical structure of the instruments themselves, the development of high-accuracy integrated geometric metrology equipment is quite challenging.

[0003] As the benchmark for length measurement, the accuracy and efficiency of gauge block calibration are crucial. Traditional gauge block calibration methods rely on manual operation and optical instruments, which suffer from low efficiency, high labor intensity, and susceptibility to human error.

[0004] Currently, advanced metrology institutions both domestically and internationally have begun utilizing high-precision inductive displacement sensor technology to automate the measurement of gauge blocks of 3, 4, and 5 mm or less. This technology, due to its maturity and reliability, has become the mainstream development trend in the metrology field. However, existing automated verification devices still have room for improvement in terms of the stability of their mechanical structures, the level of intelligent integration in the measurement process, and the automatic processing and interpretation of measurement data.

[0005] Therefore, developing a gauge block calibration device with a stable mechanical structure, effective heat insulation measures, fully automated measurement process, and intelligent data processing is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] This invention provides an automated gauge block calibration device and method to solve the problems of low efficiency and low accuracy in existing high-precision gauge block calibration. The device features high integration, good automation, high measurement accuracy, and strong stability, enabling it to efficiently and accurately complete the automated calibration of gauge blocks.

[0007] According to one aspect of the present invention, an automated gauge block calibration device is provided for automated calibration of 0.5-150mm gauge blocks, comprising a mounting base, a support platform, and a cantilever. A Z-axis guide rail is provided on the mounting base. The cantilever is slidably mounted on the Z-axis guide rail and a probe guide rail is mounted on the cantilever. A five-ribbed worktable for carrying gauge blocks is mounted on the support platform, and the five-ribbed worktable is located below the probe guide rail. A probe is mounted on the probe guide rail. The probe includes a probe and two spaced-apart upper and lower magnetic conductors, which are spaced apart to form an air wedge. An induction coil is sleeved on the upper magnetic conductor, and the lower magnetic conductor is fixedly connected to the probe. The probe is positioned opposite to the five-ribbed worktable.

[0008] Based on the above scheme, a potential sensor is preferably provided on the top of the probe, and the potential sensor is used to obtain the change in the inductance of the probe.

[0009] Based on the above scheme, the preferred embodiment further includes an LC oscillation circuit and a two-stage amplifier circuit, which are used to oscillate and amplify the acquired inductance signal.

[0010] Based on the above scheme, a preferred embodiment is that the output terminal of the two-stage amplifier circuit is connected to a target signal extraction system, which extracts the frequency information corresponding to the displacement from the signal output by the amplifier circuit.

[0011] Based on the above scheme, a preferred embodiment is provided on the cantilever, which is equipped with a mounting bracket for installing a heat insulation screen, and the heat insulation screen is arranged around the outside of the five-ribbed workbench.

[0012] Based on the above scheme, a preferred embodiment is that the induction coil is externally connected to a frequency oscillation circuit. When the frequency oscillation circuit applies a voltage to the induction coil, the probe forms an inductive wedge-shaped frequency displacement sensor.

[0013] This invention provides a calibration method for an automated gauge block calibration device, comprising the following steps: Step S1: Enter the verification information, select the standard gauge block according to the measured block, and establish the verification task; Step S2: Place the standard gauge block and the corresponding gauge block to be tested on the five-ribbed worktable in sequence, move the probe to the position above the gauge block to be tested, and finely adjust the five-ribbed worktable so that the probe contacts the gauge block and the reading is within the range of the sensor. Step S3: Measure the standard gauge block center O1, the measured block center O2, and the four corners a, b, c, d of the measured block in that order, record the measured values, and automatically calculate the measurement results after all six points have been measured, automatically determine the gauge block grade, and complete the verification of the current gauge block pair.

[0014] The present invention discloses an automated gauge block calibration device, which employs a highly stable mechanical worktable and a precision frequency-type inductive displacement sensor to accurately capture minute dimensional changes in the gauge blocks and ensure accurate and reliable measurement data. The device is equipped with a heat insulation screen to effectively reduce the interference of ambient temperature changes on the measurement results. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the automated gauge block calibration device of the present invention; Figure 2 This is a perspective view of the automated gauge block calibration device of the present invention; Figure 3 This is a schematic diagram of the probe structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the probe of the present invention; Figure 5 This is a circuit diagram of the automated gauge block calibration device of the present invention; Explanation of icon numbers: 1. Mounting base; 2. Support platform; 3. Cantilever; 4. Probe guide rail; 5. Five-ribbed worktable; 6. Probe head; 7. Mounting bracket; 8. Heat insulation screen; 61. Potential sensor; 62. Upper magnetic conductor; 63. Lower magnetic conductor; 64. Air wedge; 65. Induction coil; 66. Probe; 67. Protective shell; 68. Baffle; 69. Limiter; 70. Base support. Detailed Implementation

[0016] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0017] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of a descriptive feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets.

[0018] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0019] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0020] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various components of the invention are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0021] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0023] Please see Figure 1 and combined Figure 2 and Figure 3 As shown, the present invention provides an automated gauge block calibration device suitable for high-precision gauge block calibration of (0.5~150) mm. The purpose of the present invention is to replace the traditional visual optical measurement system with a high-precision frequency-type inductive displacement sensor, and integrate dedicated computer gauge block measurement software, thereby constructing an automated calibration system combining hardware and software.

[0024] An automated gauge block calibration device of the present invention includes a mounting base 1, a support platform 2 and a cantilever 3. A high-precision Z-axis linear guide (not shown separately in the figure) is mounted on the base, and the cantilever 3 is slidably mounted on the Z-axis guide.

[0025] The cantilever 3 of the present invention is equipped with a measuring rod guide rail 4, and the bearing platform 2 is equipped with a five-ribbed worktable 5 for bearing the gauge block. The five-ribbed worktable 5 is located below the measuring rod guide rail 4.

[0026] The measuring rod guide rail 4 of the present invention is equipped with a measuring head 6, which includes a probe 66 and two spaced-apart upper and lower magnetic conductors 63. An insulating gasket maintains a precise micro-gap between the upper magnetic conductor 62 and the lower magnetic conductor 63, forming an "air wedge 64". The induction coil 65 is wound around the upper magnetic conductor 62. The probe 66 is rigidly connected to the lower magnetic conductor 63. When the probe 66 contacts the surface of the gauge block and produces a micro-displacement as its height changes, it will drive the lower magnetic conductor 63 to move, changing the magnetic resistance of the air wedge 64, thereby causing a change in the inductance of the induction coil 65.

[0027] Furthermore, the present invention provides a protective shell 67 at the lower part of the probe 6. The protective shell 67 contains an upper baffle 68 and a limiter 69. The bottom of the protective shell 67 is sealed by a base support 70. The probe 66 extends through the baffle 68 and the limiter 69 to the outside of the base support 70, and the baffle 68 and the limiter 69 are connected by a spring.

[0028] When the measuring rod is subjected to an external force, it moves backward along the guide structure (such as the inner wall of the protective housing), compressing the spring. After the external force disappears, the spring pushes the measuring rod back to its initial position. The baffle 68 ensures that the measuring rod does not overextend or retract, guaranteeing a controllable range of motion.

[0029] The probe 6 is equipped with a potential sensor 61 at its top. The potential sensor 61 is used to obtain the change in inductance of the probe 6, that is, to convert the change in inductance of the induction coil 65 into an electrical signal.

[0030] The present invention also includes an LC oscillation circuit and a two-stage amplifier circuit. The LC oscillation circuit and the two-stage amplifier circuit are used to oscillate and amplify the acquired inductance signal. The output terminal of the two-stage amplifier circuit is connected to a target signal extraction system to extract the frequency information corresponding to the displacement from the signal output by the amplifier circuit.

[0031] This change in inductance is processed by the back-end signal processing system ( Figure 4 The signal is captured. It first enters the LC oscillation circuit and is converted into a frequency signal. Then it is amplified by two stages of amplifier circuits, and then filtered and digitized by the target signal extraction system (usually a microcontroller or a dedicated digital signal processor). Finally, a precise digital quantity proportional to the displacement is calculated and transmitted to the host computer.

[0032] It is worth noting that the induction coil 65 is externally connected to a frequency oscillation circuit. When the frequency oscillation circuit applies a voltage to the induction coil 65, the probe 6 forms an inductive wedge-shaped frequency displacement sensor.

[0033] During operation, an air wedge 64δ is formed between the upper magnetic conductor 62 and the lower magnetic conductor 63; the induction coil 65 is wound on the upper magnetic conductor 62; and the measuring rod is connected to the lower magnetic conductor 63.

[0034] When a certain voltage is applied to the induction coil 65 by the frequency oscillation circuit, the entire circuit oscillates. Placing the workpiece (gauge block) below the measuring rod and moving it up and down causes the lower magnetic conductor 63 to move along with it, thereby changing the thickness of the air wedge 64δ. The increase or decrease in the air wedge 64δ causes a change in the magnetic reluctance of the magnetic circuit, which in turn changes the inductance of the induction coil 65. Thus, the conversion from a geometric quantity (displacement) to an electrical quantity (inductance) is completed.

[0035] Furthermore, the present invention also uses a heat insulation screen 8, which is mounted on the outside of the five-ribbed workbench 5 via a mounting bracket 7, to isolate ambient temperature fluctuations and provide a stable thermal environment for high-precision measurement.

[0036] To further illustrate the workflow and signal processing of the automated gauge block verification device of the present invention, the implementation process of this device will be described in detail below using the main detection quantity as an example: Task setup: The calibration personnel log in to the computer-based gauge block measurement software using their username and password, connect and initialize the frequency-type inductive displacement sensor. Then, they enter the information of the gauge block to be inspected, select a suitable standard gauge block, and create a specific measurement task in the software.

[0037] Gauge block placement and focusing: Following the prompts in the software task list, the operator places the standard gauge block and the corresponding gauge block to be inspected sequentially on the five-ribbed worktable 5. Using the handwheel, the sensor probe 6 is moved above the gauge block. Then, by fine-tuning the lifting mechanism and the worktable, the probe 66 of the probe 6 is brought into slight contact with the measuring surface of the gauge block. At this point, the reading on the software interface should stabilize within the linear range of the sensor.

[0038] Automatic Measurement and Signal Conversion: Start the automatic measurement program in the software. Probe 6 will perform measurements along a preset path (usually the center O1 of the standard gauge block, the center O2 of the measured block, and the four corners a, b, c, and d of the measured block, for a total of six points). At each point, the system will wait for the reading to stabilize before automatically recording the data.

[0039] After the six-point measurement is completed, the micro-unevenness of the gauge block surface causes a small displacement of the measuring rod C. The system software immediately calculates the center length deviation, flatness and parallelism, and automatically judges them according to the JJG146-2011 "Gauge Block" verification procedure, generating an electronic verification certificate containing all data and conclusions.

[0040] like Figure 4 As shown, this displacement is immediately converted into a change in the inductance of coil W, and this change in inductance enters as follows: Figure 5The signal processing system shown includes: a signal conversion unit that initially extracts the signal of inductance change; an LC oscillation circuit and a two-stage amplifier circuit that converts the weak inductance signal into a frequency signal that is easy to process and then amplifies it; and a target signal extraction system that accurately extracts the frequency information corresponding one-to-one with the displacement from the amplified signal.

[0041] Displacement calibration system: The acquired frequency signal is compared and calculated with the calibration data (the correspondence between displacement and frequency signal is known) stored in the software, and finally the accurate displacement data is output.

[0042] Data Processing and Judgment: Once all six points of a pair of gauge blocks have been measured, the measurement software will instantly and automatically calculate all data (such as center length deviation, length variation, etc.) and automatically determine the grade of the gauge blocks being inspected according to the national gauge block verification regulations. The result is recorded and stored in the system.

[0043] Task Cycle and Output: After one set of gauge blocks is calibrated, the system prompts the operator to measure the next pair of gauge blocks in the task sequence until the entire task is completed. Finally, the user can view the results in batches in the software, generate standard format calibration certificates, and print them through a connected printer.

[0044] For sampling inspections, the process is largely the same as for main inspections, with the following differences: When a task is created, a portion of the gauge blocks are extracted from the already verified gauge block library for verification.

[0045] During measurement, the four corner points are generally no longer measured. Instead, only the center points of the standard gauge block and the sampled gauge block are measured. After calculating the center length deviation, it is compared with historical data to verify the calibration results and control the quality.

[0046] Compared with the prior art, the automated gauge block verification device and verification method provided by the present invention have the following significant advantages: This invention employs a highly stable mechanical worktable and a precision frequency-type inductive displacement sensor, which can accurately capture minute dimensional changes in gauge blocks, ensuring accurate and reliable measurement data. Through computer gauge block measurement software, the entire process from task setup, automatic measurement, data calculation to grade determination is automated, completely eliminating human reading errors and calculation mistakes, and greatly improving verification efficiency.

[0047] On the other hand, during the verification process of this invention, the verification personnel only need to place the gauge blocks and start the task. The complex measurement and calculation process is automatically completed by the device, which significantly reduces the difficulty of operation and labor intensity.

[0048] This invention combines the functions of main inspection quantity and sampling inspection quantity, which can meet the different needs of periodic verification of gauge blocks and improve the practicality and flexibility of the device.

[0049] The present invention is equipped with a heat insulation screen 8, which effectively reduces the interference of ambient temperature changes on the measurement results.

[0050] Finally, the method described in this application is merely a preferred embodiment and is not intended to limit the scope of protection of this invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A gauge block automatic verification device for 0.5 to 150 mm gauge block automatic verification, characterized by, The application relates to a displacement sensor, which comprises a mounting base, a bearing table and a cantilever, the mounting base is provided with a Z-axis guide rail, the cantilever is slidably arranged on the Z-axis guide rail, a measuring rod guide rail is arranged on the cantilever, a five-muscle workbench for bearing a gauge block is arranged on the bearing table, and the five-muscle workbench is below the measuring rod guide rail; a measuring head is arranged on the measuring rod guide rail, the measuring head comprises a probe and two upper and lower magnetic conductors which are arranged at intervals to form an air wedge, an inductor coil is sleeved on the upper magnetic conductor, the lower magnetic conductor is fixedly connected with the probe, and the probe is arranged opposite to the five-muscle workbench.

2. A gauge block automated verification apparatus as claimed in claim 1, wherein, The measuring head is provided with a potential sensor at the top, and the potential sensor is used for acquiring the inductance change of the measuring head.

3. A gauge block automated verification apparatus as claimed in claim 2, wherein, The application further comprises an LC oscillation circuit and a two-stage amplification circuit, which are used for oscillation amplification processing of the acquired inductance signal.

4. A gauge block automated verification apparatus as claimed in claim 3, wherein, A target signal extraction system is connected to the output end of the two-stage amplification circuit, and the signal output by the amplification circuit is used for extracting frequency information corresponding to the displacement.

5. A gauge block automated verification apparatus as claimed in claim 1, wherein, An installation rack for installing a heat shield is arranged on the cantilever, and the heat shield is arranged outside the five-muscle workbench.

6. A gauge block automated verification apparatus as claimed in claim 1, wherein, The inductor coil is connected with a frequency oscillation circuit, the measuring head forms an inductance wedge type frequency displacement sensor when the frequency oscillation circuit applies voltage to the inductor coil.

7. A method of calibrating a gauge block automated calibration apparatus, characterized by, The application comprises the following steps: S1, inputting calibration information, selecting a standard gauge block according to the measured gauge block, and establishing a calibration task; S2, sequentially placing the standard gauge block and the corresponding measured gauge block on the five-muscle workbench, moving the measuring head to a position above the measured gauge block, and slightly adjusting the five-muscle workbench so that the measuring head is in contact with the gauge block and the indication is within the range of the sensor; S3, measuring the standard gauge block center O1, the measured gauge block center O2, and the four corners a, b, c and d of the measured gauge block in sequence, recording the measurement values, automatically calculating the measurement results when the six points are measured, automatically performing gauge block grade determination, and completing the calibration of the current gauge block pair.

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