Automatic measuring and ablation analyzing device for inner diameter of cylindrical cathode

Abstract

The utility model discloses a kind of automatic measurement and ablation analysis device of cylindrical cathode inner diameter, the centering mechanism of the device is located at the outer ring of cylindrical cathode port, rigid installation pedestal integrated drive motor and is located at the center of centering mechanism, linear guide is centrally located in rigid installation pedestal and extends into the inner ring of cylindrical cathode, linear guide is driven rotation and linear movement by drive motor, head measuring arm and middle measuring arm are respectively integrated displacement sensing unit and spaced apart in linear guide, and the displacement sensing unit of head measuring arm and middle measuring arm and rotating drive motor are respectively electrically connected with the industrial computer.The device moves and rotates along the axis of cylindrical cathode by head measuring arm and middle measuring arm, and realizes the measurement of the inner diameter of cylindrical cathode.The device overcomes the defects of traditional cylindrical cathode inner diameter measurement, measurement operation is simple, improves measurement accuracy, realizes the ablation analysis of the inner wall of cylindrical cathode, and improves the reliability and fault tolerance capability of on-site use.

Description

Technical Field

[0001] This utility model relates to the field of equipment testing technology, and in particular to an automatic measurement and ablation analysis device for the inner diameter of a cylindrical cathode. Background Technology

[0002] Currently, the inner diameter measurement of cylindrical cathodes (such as plasma torches) mainly relies on manual operation using mechanical internal calipers or internal micrometers. Operators insert the measuring tool into the cathode, judge by touch whether it fits the inner wall of the cylindrical cathode, read the scale with the naked eye, and manually record the measurement data.

[0003] This method can only achieve single-point discrete measurements and cannot obtain continuous inner wall contour data. It also relies heavily on operational experience. Manual measurement has large errors, with a contact error of about ±0.05mm by touch and an error of about ±0.02mm by visual reading, resulting in poor repeatability. The measurement efficiency is low, as each measurement operation achieves a single-point measurement, and comprehensive inspection would be extremely time-consuming. At the same time, the measurement data is difficult to save, analyze, and trace, and it is impossible to generate contour curves, making it difficult to intuitively judge the ablation situation. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an automatic measurement and ablation analysis device for the inner diameter of a cylindrical cathode. This device overcomes the defects of traditional cylindrical cathode inner diameter measurement, is simple to operate, improves measurement accuracy, realizes ablation analysis of the inner wall of the cylindrical cathode, and enhances the reliability and fault tolerance of field use.

[0005] To solve the above-mentioned technical problems, the present invention provides an automatic measurement and ablation analysis device for the inner diameter of a cylindrical cathode, comprising a centering mechanism, a rigid mounting base, a linear guide rail, a head measuring arm, a middle measuring arm, and an industrial control computer. The centering mechanism is located on the outer ring of the cylindrical cathode port. The rigid mounting base integrates a drive motor and is located at the center of the centering mechanism. The linear guide rail is centrally and movably mounted on the rigid mounting base and extends into the inner ring of the cylindrical cathode. The linear guide rail is driven to rotate and move linearly by the drive motor. The head measuring arm and the middle measuring arm each integrate a displacement sensing unit and are spaced apart on the linear guide rail. The displacement sensing units and drive motors of the head measuring arm and the middle measuring arm are electrically connected to the industrial control computer.

[0006] Furthermore, the head measuring arm and the middle measuring arm are provided with a phase difference of 30°, 45° or 90° in circumferential angle during initial installation.

[0007] Furthermore, the displacement sensing unit is a displacement sensor, a digital display internal caliper, or a laser rangefinder, used to measure the inner diameter data of the cylindrical cathode.

[0008] Furthermore, the centering mechanism is connected to an external CNC rotary fixture, which drives the cylindrical cathode to rotate through the centering mechanism.

[0009] Furthermore, the centering mechanism is a three-jaw chuck, which is pneumatically driven to open and close.

[0010] This utility model's automatic measurement and ablation analysis device for the inner diameter of a cylindrical cathode adopts the aforementioned technical solution. Specifically, the centering mechanism is located on the outer ring of the cylindrical cathode port; a rigid mounting base integrates a drive motor and is positioned at the center of the centering mechanism; a linear guide rail is centrally mounted on the rigid mounting base and driven to rotate and move linearly by the drive motor; the head measuring arm and the middle measuring arm each integrate displacement sensing units and are spaced apart on the linear guide rail; the displacement sensing units of the head measuring arm and the middle measuring arm, as well as the rotation drive motor, are connected to an industrial control computer. This device achieves the measurement of the inner diameter of the cylindrical cathode by moving and rotating the head measuring arm and the middle measuring arm along the axis of the cylindrical cathode. This device overcomes the shortcomings of traditional cylindrical cathode inner diameter measurement, simplifies the measurement operation, improves measurement accuracy, enables ablation analysis of the inner wall of the cylindrical cathode, and enhances the reliability and fault tolerance for field use. Attached Figure Description

[0011] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the automatic measurement and ablation analysis device for the inner diameter of the cylindrical cathode of this utility model; Figure 2 A flowchart illustrating the measurement method using this device. Detailed Implementation

[0012] Implementation, for example Figure 1 As shown, the automatic measurement and ablation analysis device for the inner diameter of a cylindrical cathode of this utility model includes a centering mechanism 1, a rigid mounting base 2, a linear guide rail 3, a head measuring arm 4, a middle measuring arm 5, and an industrial control computer 6. The centering mechanism 1 is located on the outer ring of the port of the cylindrical cathode 7. The rigid mounting base 2 integrates a drive motor and is located at the center of the centering mechanism 1. The linear guide rail 3 is centrally and movably located on the rigid mounting base 2 and extends into the inner ring of the cylindrical cathode 7. The linear guide rail 3 is driven to rotate and move linearly by the drive motor. The head measuring arm 4 and the middle measuring arm 5 respectively integrate displacement sensing units and are spaced apart on the linear guide rail 3. The displacement sensing units and drive motors of the head measuring arm 4 and the middle measuring arm 5 are electrically connected to the industrial control computer 6.

[0013] Preferably, the head measuring arm 4 and the middle measuring arm 5 are initially installed with a phase difference of 30°, 45°, or 90° in circumferential angle. With this configuration, the system can simultaneously acquire two sets of inner diameter data at the same axial position and different circumferential angles on the inner wall of the cylindrical cathode in a single axial scan, significantly increasing the data acquisition density. This helps to detect non-axisymmetric localized ablation pits 71 or deformations, obtaining more comprehensive information on the inner wall contour of the cylindrical cathode in one go, and significantly improving detection efficiency and reliability.

[0014] Preferably, the displacement sensing unit is a displacement sensor, a digital display internal caliper, or a laser rangefinder, used to measure the inner diameter data of the cylindrical cathode 7.

[0015] Preferably, the centering mechanism 1 is connected to an external CNC rotary fixture, and the external CNC rotary fixture drives the cylindrical cathode 7 to rotate through the centering mechanism 1.

[0016] Preferably, the centering mechanism 1 is a three-jaw chuck, which is pneumatically driven to open and close.

[0017] An automatic measurement and ablation analysis method for the inner diameter of a cylindrical cathode based on the above-mentioned device includes the following steps: Step 1: Fix the centering mechanism and rigid mounting base to the port of the cylindrical cathode, operate the centering mechanism to clamp the outer cylindrical surface of the cylindrical cathode, and establish the initial coaxial reference between the equipment coordinate system and the axis of the cylindrical cathode.

[0018] Step 2: Start the measurement command through the industrial control computer. The linear guide rail is driven by the drive motor to move the head measuring arm and the middle measuring arm axially into the cylindrical cathode synchronously. The two measuring arms perform radial measurement at each axial measurement point (Z coordinate) to obtain two inner diameter readings. The industrial control computer receives the two sets of inner diameter measurement data in real time through the signal / power cable. The displacement sensors built into the head measuring arm and the middle measuring arm synchronously collect the current axial position (Z value) and radial extension displacement (L1, L2), forming continuous (Z,L) coordinate data and transmitting it to the industrial control computer. Step 3: After a single measurement is completed, the head measuring arm and the middle measuring arm are driven by the drive motor to rotate the linear guide rail to complete the preset angle (e.g., 30°). Then, the linear guide rail drives them to move axially into the cylindrical cathode again to repeat the measurement steps. Step 4: The industrial control computer receives the measurement data in real time and automatically calculates the actual inner diameter of each axial position based on the initial calibration parameters of the head measuring arm and the middle measuring arm (e.g., diameter = L1 + L2 + initial unit spacing D, where the initial unit spacing D is the radial distance between the displacement sensors of the head measuring arm and the middle measuring arm at the initial calibration position).

[0019] Step 5: The industrial control computer's built-in algorithm automatically identifies abnormal inner diameter areas (i.e., ablation zones) and draws the inner wall contour curve on the touch screen in real time (the horizontal axis is the axial position Z, and the vertical axis is the calculated inner diameter value). Step 6: After the measurement is completed, an inspection report containing the original data and ablation analysis results (such as the maximum ablation depth and the length of the ablation area) will be automatically generated. The report can be exported via USB flash drive, transmitted via Bluetooth, or printed on-site.

[0020] Preferably, the industrial control computer drives the linear guide rail to rotate and move linearly via a drive motor, controlling the head measuring arm and the middle measuring arm to perform helical scanning or multi-layer scanning modes. The scanning process is as follows: a. The industrial control computer controls the head measuring arm and the middle measuring arm to perform a complete axial scan from the cylindrical cathode port to the tube tail; b. When the head measuring arm reaches the preset end point of the tube tail or the sensor determines that there is no measuring surface, the industrial control computer automatically triggers the drive motor to drive the linear guide rail to rotate around the axis of the cylindrical cathode by a predetermined angle (such as 10 to 30°).

[0021] c. After rotation is complete, the head measuring arm and the middle measuring arm automatically reverse scan, return from the tail of the pipe to the port, and perform a second data acquisition.

[0022] d. The above process is repeated until the measurement of the entire 360 ​​degrees of the cylindrical cathode is completed.

[0023] This scanning process enables fully automated large-scale measurements, acquiring complete three-dimensional data cloud maps of the inner wall of the cylindrical cathode without human intervention, thereby generating a highly valuable three-dimensional model of ablation distribution, achieving the most thorough and intuitive assessment of the ablation condition.

[0024] Preferably, the preset angle rotation of the head measuring arm and the middle measuring arm is intelligently determined by the displacement sensor data of any one of the measuring arms. When the displacement sensor detects a sudden and drastic change in the radial displacement (such as exceeding the threshold) or signal loss, it is determined that the edge of the cylindrical cathode has been scanned, and then the rotation command is automatically triggered to enter the measurement process of the next rotation angle.

[0025] Preferably, the industrial control computer controls the external CNC rotary fixture to drive the cylindrical cathode to rotate, and the drive motor drives the linear guide rail to move linearly along the internal axis of the cylindrical cathode, so as to realize the relative movement between the head measuring arm and the middle measuring arm and the cylindrical cathode.

[0026] In processes involving the rotation of the measuring arm, the rotation trigger signal does not depend on a preset stroke endpoint. Instead, it is intelligently determined by the displacement sensor data of any measuring arm, enabling intelligent control of rotation triggered by any measuring arm. This intelligent control can adapt to cylindrical cathodes of different lengths, eliminating the need for manual setting of stroke parameters before measurement. It offers a higher level of intelligence, further simplifying the operation process and preventing measurement failures due to incorrect parameter settings.

[0027] The rotational motion of this device and method can also be achieved by driving a cylindrical cathode. Specifically, the centering mechanism holding the cylindrical cathode 7 can be mounted on an external CNC rotary fixture. During measurement, the linear guide rail only moves axially. After one axial scan is completed, the industrial control computer 6 controls the external CNC rotary fixture to rotate the cylindrical cathode 7 by a predetermined angle, and then the measuring arm performs the next axial scan. This scheme simplifies the mechanical complexity of the measuring device and is suitable for inspection scenarios with readily available rotary workstations.

[0028] This device and method are simple to operate. The entire process, from centering, scanning, data acquisition, real-time compensation to ablation analysis, can be completed automatically by an industrial control computer, greatly reducing the technical requirements and labor intensity for operators. It improves measurement accuracy, with a coaxiality error of ≤0.02 mm and a measurement accuracy of ±0.01 mm. The integrated design makes it portable and easy to use in the field. At the same time, the dual measuring arm design serves as a backup for each other. If a single sensor fails, the system can degrade and alarm, which greatly improves the reliability and fault tolerance of the equipment in the field.

Claims

1. An automatic device for measuring the inner diameter of a cylindrical cathode and analyzing ablation, characterized in that: The device includes a centering mechanism, a rigid mounting base, a linear guide rail, a head measuring arm, a middle measuring arm, and an industrial control computer. The centering mechanism is located on the outer ring of the cylindrical cathode port. The rigid mounting base integrates a drive motor and is located at the center of the centering mechanism. The linear guide rail is centrally and movably mounted on the rigid mounting base and extends into the inner ring of the cylindrical cathode. The linear guide rail is driven to rotate and move linearly by the drive motor. The head measuring arm and the middle measuring arm each integrate a displacement sensing unit and are spaced apart on the linear guide rail. The displacement sensing units and drive motors of the head measuring arm and the middle measuring arm are electrically connected to the industrial control computer.

2. The automatic measurement and ablation analysis device for the inner diameter of the cylindrical cathode according to claim 1, characterized in that: The head measuring arm and the middle measuring arm are initially installed with a phase difference of 30°, 45° or 90° in circumferential angle.

3. The automatic measurement and ablation analysis device for the inner diameter of a cylindrical cathode according to claim 1 or 2, characterized in that: The displacement sensing units are displacement sensors, digital display internal calipers, or laser rangefinders, used to measure the inner diameter data of the cylindrical cathode.

4. The automatic measurement and ablation analysis device for the inner diameter of the cylindrical cathode according to claim 3, characterized in that: The centering mechanism is connected to an external CNC rotary fixture, which drives the cylindrical cathode to rotate through the centering mechanism.

5. The automatic measurement and ablation analysis device for the inner diameter of the cylindrical cathode according to claim 3, characterized in that: The centering mechanism is a three-jaw chuck, which is pneumatically driven to open and close.

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