A testing fixture for machining electronic backplane structural components

Abstract

This utility model discloses a testing fixture for machining electronic backplane structural components, comprising: a fixture body with an assembly surface for positioning the backplane structural component; at least one inductive proximity sensor embedded in a preset detection point on the fixture body, the preset detection point corresponding to the flatness area and / or magnet embedding area of ​​the backplane structural component to be tested; a signal amplifier electrically connected to the inductive proximity sensor, receiving and amplifying the position signal and magnetic polarity signal output by the sensor; the output of the signal amplifier is connected to the control system of the CNC machine tool, so that the sensor data is fed back to the machine tool panel and triggers machining start / stop commands. This utility model provides a testing fixture for machining electronic backplane structural components to solve the problems of low detection efficiency and limited functionality of traditional CNC probes. By simultaneously acquiring the Z-axis height deviation and magnet polarity signal of the backplane structural component through the sensor, it overcomes the limitation of traditional probes that can only measure height.

Description

Technical Field

[0001] This utility model relates to the field of testing fixture technology, specifically to a testing fixture for processing electronic backplane structural components. Background Technology

[0002] Currently, fiberglass backplate structural components, such as mobile phone back covers, tablet protective case substrates, and wearable smartwatch protective cases, generally rely on in-machine probes to detect the flatness of the product during CNC machining. The traditional method requires driving the probe mechanically to a preset point after each product is clamped, collecting Z-axis height data point by point to calculate flatness. This technology has significant drawbacks:

[0003] 1. Low testing efficiency: If six key points need to be tested on a single product, the mechanical movement and data acquisition take about 12 seconds, which seriously slows down the production line cycle time;

[0004] 2. Functional limitations: The probe can only acquire height data in the Z-axis and cannot identify the polarity of the magnets or iron sheets embedded in the composite board. Modern products often have built-in magnets for error-proofing during assembly; incorrect polarity will cause functional failure.

[0005] 3. Cost and maintenance issues: Adding a probe module to each CNC machine is costly, and the probes are easily damaged due to misoperation, requiring frequent maintenance;

[0006] 4. Magnetic pole detection requires an additional independent workstation, which further extends the production cycle.

[0007] Therefore, there is an urgent need to develop an integrated testing solution that can achieve integrated testing of flatness and magnetic polarity while reducing production cycle time. Utility Model Content

[0008] To address the shortcomings of existing technologies, this utility model provides a testing fixture for machining electronic backplane structural components, thereby solving the problems of low testing efficiency and limited functionality of traditional CNC probes.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A testing fixture for machining electronic backplane structural components includes:

[0011] The fixture body has an assembly surface for positioning the back plate structural components;

[0012] At least one inductive proximity sensor is embedded in a preset detection point on the fixture body, the preset detection point corresponding to the flatness area and / or magnet embedding area of ​​the back plate structure to be detected;

[0013] The signal amplifier is electrically connected to the inductive proximity sensor to receive and amplify the position signal and magnetic polarity signal output by the sensor.

[0014] The output of the signal amplifier is connected to the control system of the CNC machine tool, so that the sensor data is fed back to the machine tool panel and the machining start and stop commands are triggered.

[0015] Furthermore, the fixture body includes a positioning plate, a mounting plate, and a support frame arranged sequentially from top to bottom; the upper surface of the positioning plate constitutes the assembly surface; a sensor mounting slot is provided on the mounting plate, and the inductive proximity sensor is embedded in the sensor mounting slot of the mounting plate, with the sensor's detection end penetrating the positioning plate and exposed on the surface of the assembly surface.

[0016] Furthermore, the sensor mounting slots are arranged in a matrix on the mounting plate, and their positions correspond to the flatness area and magnet embedding area of ​​the back plate structure to be inspected.

[0017] Furthermore, the inductive proximity sensor is fixed in the sensor mounting slot by a detachable structure.

[0018] Furthermore, there are multiple inductive proximity sensors, which are connected in parallel and electrically connected to a signal amplifier.

[0019] Furthermore, the detection direction of the inductive proximity sensor is perpendicular to the assembly surface of the fixture body, and is used to simultaneously detect the Z-axis height deviation and magnet polarity of the back plate structure.

[0020] Compared with existing technologies, the technical solution of this patent has the following advantages:

[0021] This patented technology replaces traditional CNC machine probes, directly integrating them into the fixture's inspection points. This eliminates the time required for probe mechanical movement, significantly reducing inspection time and greatly improving efficiency. By simultaneously acquiring the Z-axis height deviation and magnetic polarity signal of the backplate structure through sensors, it overcomes the limitation of traditional probes that can only measure height. A single sensor synchronously outputs both Z-axis height deviation and magnetic polarity signals, replacing the need for a separate probe and magnetic inspection station. The amplified sensor signal directly triggers CNC machining start / stop commands. If the detected value exceeds the tolerance, the process automatically pauses and issues a warning, preventing defective products from entering the machining process and establishing a closed-loop inspection-machining chain. Attached Figure Description

[0022] Figure 1 The diagram shows the overall structure of the inspection fixture for machining electronic backplane structural components.

[0023] Figure 2 The diagram shown is an exploded view of the inspection fixture used for machining electronic backplane structural components.

[0024] Figure 3 As shown Figure 2 A magnified schematic diagram of a portion of the structure.

[0025] In the figure: 1. Fixture body; 2. Inductive proximity sensor; 3. Signal amplifier; 11. Positioning plate; 12. Mounting plate; 13. Support frame; 121. Sensor mounting slot. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] See Figure 1-3 As shown, this embodiment provides a testing fixture for machining electronic backplane structural components, including: a fixture body 1, with an assembly surface for positioning the backplane structural component; at least one inductive proximity sensor 2, embedded in a preset detection point on the fixture body 1, the preset detection point corresponding to the flatness area and / or magnet embedding area of ​​the backplane structural component to be tested; a signal amplifier 3, electrically connected to the inductive proximity sensor 2, receiving and amplifying the position signal and magnetic polarity signal output by the sensor; the output of the signal amplifier 3 is connected to the control system of the CNC machine tool, so that the sensor data is fed back to the machine tool panel and triggers machining start / stop commands. The linkage logic between the signal amplifier 3 and the CNC machine tool control system is as follows: when the Z-axis height deviation or magnetic polarity detected by the inductive high-precision proximity sensor 2 exceeds the preset tolerance range, the CNC machine tool control system suspends product processing and issues a warning signal. This invention replaces the traditional CNC in-machine probe, directly integrating it on the fixture detection point, saving the probe mechanical movement time, significantly shortening the detection time, and significantly improving efficiency. By simultaneously acquiring the Z-axis height deviation and magnet polarity signal of the backplate structural components using sensors, this method overcomes the limitation of traditional probes that can only measure height. The sensor signals are amplified and directly trigger CNC machining start and stop commands. If the detected value exceeds the tolerance, the process automatically pauses and issues a warning, preventing defective products from entering the machining process and establishing a closed-loop detection-machining chain.

[0028] The fixture body 1 includes a positioning plate 11, a mounting plate 12, and a support frame 13 arranged sequentially from top to bottom. The upper surface of the positioning plate 11 forms an assembly surface. A sensor mounting slot 121 is provided on the mounting plate 12. An inductive proximity sensor 2 is embedded in the sensor mounting slot 121 of the mounting plate 12, and the sensor's detection end penetrates through the positioning plate 11 and is exposed on the surface of the assembly surface. The sensor's detection end penetrating through the positioning plate and being exposed on the assembly surface eliminates measurement errors and improves the flatness detection accuracy. The mounting plate 12 has a dedicated sensor mounting slot 121, which isolates the sensor from the assembly function of the positioning plate 11, avoids interference from processing vibrations with the sensor's stability, and facilitates maintenance and replacement.

[0029] The sensor mounting slots 121 are arranged in a matrix on the mounting plate 12, and their positions correspond to the flatness areas and magnet embedding areas of the back panel structure that need to be inspected. The slots are arranged in a matrix and strictly correspond to the key flatness areas and / or magnet embedding areas of the back panel structure to ensure that no area is missed during inspection.

[0030] The inductive proximity sensor 2 is fixed in the sensor mounting slot 121 by a detachable structure, which includes, but is not limited to, screw connection structure or snap-fit ​​connection structure. The sensor can be installed and removed independently, supporting the replacement of different sensor models or layout adjustment, adapting to the production of various backplane structural components, while reducing fixture maintenance costs and downtime.

[0031] Multiple inductive proximity sensors 2 are connected in parallel and electrically connected to a signal amplifier 3. Multiple sensors operate synchronously, collecting data from all detection points at once. Traditional probes require point-by-point movement, further reducing detection time and improving production line cycle time.

[0032] The inductive proximity sensor 2 is perpendicular to the assembly surface of the fixture body 1, and is used to simultaneously detect the Z-axis height deviation and magnetic polarity of the backplate structure. The sensor's detection direction is perpendicular to the assembly surface, ensuring that the Z-axis height measurement accuracy is not affected by angular deviations. Simultaneously, it maximizes the efficiency of magnetic field line induction, improves the accuracy of magnetic pole polarity identification, and allows the same sensor to simultaneously capture: Z-axis height deviation through inductive distance sensing; and magnetic polarity through magnetic field direction identification. This structurally solves the defect of traditional probes that cannot detect magnetic poles.

[0033] In use, multiple inductive proximity sensors 2 are arranged in a matrix and embedded in the mounting slots 121 of the fixture mounting plate 12, with the detection end penetrating the positioning plate 11 and exposed on the assembly surface. After the backplate structure is clamped, each sensor synchronously collects the Z-axis height of each point. The sensor signals are amplified by the signal amplifier 3 and transmitted to the CNC control system. The system compares the Z-axis height deviation with the preset tolerance in real time: if the data is qualified, it triggers automatic CNC machining; if it exceeds the preset tolerance, it pauses machining and issues an audible and visual warning. If there is a magnetic pole detection requirement within the backplate structure, the inductive proximity sensor 2 corresponds to the area where the magnet needs to be detected. The inductive proximity sensor 2 emits an alternating magnetic field. When the magnet enters the sensing area, its polarity changes, causing eddy current loss in the magnetic field. The sensor outputs a polarity discrimination signal based on this, which can be used to detect whether the magnet polarity is installed correctly.

Claims

1. A testing fixture for machining electronic backplane structural components, characterized in that, include: The fixture body (1) is provided with an assembly surface for positioning the back plate structural components; At least one inductive proximity sensor (2) is embedded in a preset detection point on the fixture body (1), the preset detection point corresponding to the flatness area and / or magnet embedding area of ​​the back plate structure to be detected; The signal amplifier (3) is electrically connected to the inductive proximity sensor (2) to receive and amplify the position signal and magnetic polarity signal output by the sensor; The output of the signal amplifier (3) is connected to the control system of the CNC machine tool, so that the sensor data is fed back to the machine tool panel and the machining start and stop command is triggered.

2. The inspection fixture for processing electronic backplane structural components according to claim 1, characterized in that, The fixture body (1) includes a positioning plate (11), a mounting plate (12) and a support frame (13) arranged sequentially from top to bottom; the upper surface of the positioning plate (11) constitutes the assembly surface; a sensor mounting slot (121) is provided on the mounting plate (12), and the inductive proximity sensor (2) is embedded in the sensor mounting slot (121) of the mounting plate (12), and the sensor's detection end penetrates the positioning plate (11) and is exposed on the surface of the assembly surface.

3. The inspection fixture for processing electronic backplane structural components according to claim 2, characterized in that, The sensor mounting slots (121) are arranged in a matrix on the mounting plate (12), and their slot positions correspond to the flatness area and magnet embedding area of ​​the back plate structure to be tested.

4. The inspection fixture for processing electronic backplane structural components according to claim 3, characterized in that, The inductive proximity sensor (2) is fixed in the sensor mounting slot (121) by a detachable structure.

5. The inspection fixture for processing electronic backplane structural components according to any one of claims 1 to 4, characterized in that, The number of inductive proximity sensors (2) is multiple, and the multiple inductive proximity sensors (2) are connected in parallel and electrically connected to the signal amplifier (3).

6. The inspection fixture for processing electronic backplane structural components according to claim 5, characterized in that, The detection direction of the inductive proximity sensor (2) is perpendicular to the assembly surface of the fixture body (1), and it simultaneously detects the Z-axis height deviation of the back plate structure and the polarity of the magnet.

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