Grating digital display device with synchronous trigger function

Abstract

This invention relates to the field of photoelectric detection technology and discloses a grating digital display device with synchronous triggering function. The device includes a frame with a display screen mounted on it. A lead screw mechanism is located below the display screen, and a detection groove is provided on one side of the lead screw mechanism. The length direction of the detection groove is parallel to the lead screw mechanism, and the parallelism error between the two is controlled at the micrometer level, ensuring that the measuring probe always probes along the length direction of the workpiece throughout its movement. A grating mechanism is provided on the lead screw mechanism. This invention, by setting a detection unit composed of a sliding resistor rod and a sliding resistor block in the calibration mechanism, can measure the fine-tuning displacement of the calibration head relative to the calibration seat in real time. The control module automatically deducts this offset from the reading value of the reading head, achieving real-time online compensation for system errors such as probe wear or manual position adjustment, ensuring measurement accuracy over long-term use.

Description

Technical Field

[0001] This invention relates to the field of photoelectric detection technology, specifically to a grating digital display device with synchronous triggering function. Background Technology

[0002] Grating digital display devices, based on the photoelectric conversion principle of moiré fringes, are widely used in CNC machine tools, coordinate measuring machines, semiconductor packaging equipment, and automated online inspection. A typical inspection process in existing technologies is as follows: the operator places the workpiece on the platform reference surface and clamps it, driving the lead screw to slowly bring the probe closer to the workpiece surface; when the probe tip contacts the workpiece, the contact state is observed visually and the digital display reading is monitored. After stabilization, the value is manually latched or recorded. This process has the following problems: First, long-term use of the probe tip wear can cause baseline drift; replacing the probe head or adjusting the extension length can also introduce zero-point offset. Traditional devices lack real-time error compensation and can only be manually calibrated periodically using standard gauge blocks, which is inefficient and results in systematic deviations in the measurement data within the calibration interval. Second, for irregularly shaped workpieces with uneven surfaces, curved surfaces, or burrs, simple planar clamping mechanisms cannot provide stable and reliable positioning. Finally, changes in ambient light can cause stray light to enter the reading head's optical path, interfering with the moiré fringe contrast, causing counting errors or signal drift, and affecting measurement stability.

[0003] Therefore, there is a need for a grating digital display device that can achieve precise synchronization of measurement triggering and data latching, has automatic error compensation, adaptive clamping for irregularly shaped workpieces, and can work stably under complex lighting conditions. This has important engineering practical value for improving the automation level and data reliability of precision testing. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a grating digital display device with synchronous triggering function, which solves the problems of asynchronous readings caused by human operation delays during dynamic measurement, system errors introduced by probe wear or position adjustment, unstable clamping of irregular workpieces, and interference from external light sources in existing grating digital display devices.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a grating digital display device with synchronous triggering function, comprising: a frame, a display screen mounted on the frame, a lead screw mechanism disposed below the display screen, a detection groove disposed on one side of the lead screw mechanism, the length direction of the detection groove being parallel to the lead screw mechanism, and the parallelism error between the two being controlled at the micrometer level to ensure that the measuring probe always detects along the length direction of the workpiece during the entire movement process; a grating mechanism disposed on the lead screw mechanism, the grating mechanism including a reading head and a grating ruler, the grating mechanism being able to detect the length of the workpiece to be detected inside the detection groove; a calibration mechanism disposed on the grating mechanism, the calibration mechanism including a calibration seat, the calibration seat being able to calibrate the detection base point of the grating mechanism; by organically integrating mechanical contact synchronous triggering with automatic error compensation function, the problem of asynchronous readings caused by human operation delay during dynamic measurement in traditional grating digital display devices is solved, while eliminating the system error introduced by the adjustment of the calibration head position, significantly improving measurement accuracy.

[0006] Preferably, the reading head is electrically connected to the display screen, and the display screen is capable of displaying the numbers on the reading head.

[0007] Preferably, the grating mechanism further includes a mounting rod and a fixing frame. The lead screw mechanism drives the mounting rod to move. The fixing frame is fixedly connected to the frame. The fixing frame has a sliding groove. The mounting rod slides inside the sliding groove. The sliding groove has a light-shielding groove. A grating ruler is installed on the bottom side of the inner wall of the light-shielding groove. A reading head is provided above the grating ruler. The reading head is mounted on the mounting rod. The fixing frame can shield the reading head and the grating ruler, reducing light source interference from external light sources to the reading head.

[0008] Preferably, a supplementary light is provided on one side of the grating ruler. The supplementary light is installed inside the light-shielding groove. The brightness of the supplementary light can be adjusted in multiple levels by the adjustment knob on the frame to adapt to the usage requirements under different ambient lighting conditions. The inner wall of the light-shielding groove is coated with a light-absorbing coating, which can effectively absorb scattered light and further reduce the impact of stray light on the grating signal quality.

[0009] Preferably, the calibration seat is mounted on the mounting rod, and a groove is provided on the bottom side of the calibration seat. A threaded screw is rotatably connected inside the groove, and a calibration head is helically connected to the threaded screw. The calibration head reciprocates inside the groove via the threaded screw.

[0010] Preferably, a measuring probe is slidably connected to the lower side of the calibration head, and a sliding block is provided on one side of the calibration head. The sliding block drives the measuring probe to move up and down, and a sliding damping is provided at the connection between the sliding block and the calibration head. When the calibration head drives the sliding resistor block to slide on the sliding resistor rod, a resistance change proportional to the displacement will be generated. The two ends of the sliding resistor rod are connected to the circuit, and this electrical signal can be converted into a displacement reading through the display on the outer wall of the calibration seat, so as to intuitively display the fine adjustment distance of the calibration seat during calibration.

[0011] Preferably, a sliding resistor block is fixedly connected to the upper side of the calibration head, a sliding resistor rod is installed inside the calibration base, the sliding resistor block slides on the sliding resistor rod, and a display is installed on the calibration base, which can display the reading generated when the sliding resistor rod and the sliding resistor block slide together.

[0012] Preferably, a limiting mechanism is provided on one side of the detection groove. The limiting mechanism includes a limiting push rod, which slides inside the detection groove. A screw rod is screwed onto the frame, and the screw rod drives the limiting push rod to slide when it rotates.

[0013] Preferably, the limiting push rod has multiple fixed springs installed inside, and multiple spring blocks are fixedly connected to the fixed springs. The spring blocks, in conjunction with the limiting push rod, can clamp the irregular surface of the workpiece to be tested inside the detection groove.

[0014] Preferably, when the measuring probe contacts the workpiece to be measured, a trigger circuit is formed; the trigger circuit is connected to the electronic control system of the display screen, and the display screen synchronously latches the position data of the current reading head the instant the circuit is turned on.

[0015] This invention provides a grating digital display device with synchronous triggering function. It has the following beneficial effects: 1. This invention, by setting a detection unit consisting of a sliding resistor rod and a sliding resistor block in the calibration mechanism, can measure the fine-tuning displacement of the calibration head relative to the calibration seat in real time, and automatically deduct the offset from the reading head measurement value in the control module. This realizes real-time online compensation for systematic errors such as probe wear or manual position adjustment, and ensures the measurement accuracy for long-term use.

[0016] 2. By setting a limiting push rod with multiple independent floating spring blocks, the present invention can adaptively conform to the concave and convex surfaces of irregular workpieces, providing stable multi-point floating clamping. At the same time, in conjunction with the anti-slip texture on the end face of the spring blocks, it effectively prevents the workpiece from slipping or rotating during the measurement process, thereby improving the repeatability and reliability of measurement of irregular workpieces.

[0017] 3. By placing the grating ruler and reading head in a semi-enclosed light-shielding groove inside the fixed frame and configuring a diffused LED supplementary light, the present invention effectively blocks the interference of stray light from the external environment on the one hand, and ensures the clarity of the grating moiré fringes through uniform and soft light curtain illumination on the other hand, thereby improving the quality of photoelectric signals and reading stability. Attached Figure Description

[0018] Figure 1 This is a perspective view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the grating mechanism of the present invention; Figure 3 This is a schematic diagram of the detection groove of the present invention; Figure 4 This is a schematic diagram of the calibration base of the present invention; Figure 5 This is a schematic diagram of the threaded lead screw of the present invention; Figure 6 This is a schematic diagram of the sliding resistor rod of the present invention; Figure 7 This is a schematic diagram of the limiting mechanism of the present invention; Figure 8 This is a schematic diagram of the fixed spring of the present invention.

[0019] The components include: 1. Frame; 101. Display screen; 102. Lead screw mechanism; 103. Detection slot; 2. Grating mechanism; 201. Fixing frame; 202. Sliding slot; 203. Mounting rod; 204. Reading head; 205. Light shielding slot; 206. Supplementary light; 207. Grating ruler; 3. Calibration mechanism; 301. Calibration base; 302. Display; 303. Lead screw; 304. Calibration head; 305. Sliding block; 306. Measuring probe; 307. Sliding resistance rod; 308. Sliding resistance block; 4. Limiting mechanism; 401. Helical rod; 402. Limiting push rod; 403. Spring block; 404. Fixed spring. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see the appendix Figure 1 -Appendix Figure 8This invention provides a grating digital display device with synchronous triggering function. The device includes a frame 1 as a supporting base, a lead screw mechanism 102 that provides precise linear motion output, a grating mechanism 2 that acquires displacement changes, a calibration mechanism 3 that performs zero-point and base-point calibration, a limiting mechanism 4 that fixes the workpiece, and a control circuit that realizes synchronous triggering and latching. This invention solves the problem of asynchronous readings caused by human operation delays during dynamic measurement in traditional grating digital display devices by organically integrating mechanical contact synchronous triggering with automatic error compensation function. At the same time, it eliminates the systematic error introduced by the adjustment of the calibration head position, and significantly improves the measurement accuracy.

[0022] like Figure 1 As shown, the frame 1 serves as the frame of the entire device. A display screen 101 for displaying the numerical values ​​of the grating mechanism 2 is fixedly installed on the frame 1. Below the display screen 101, a lead screw mechanism 102 is horizontally arranged along the length of the frame 1. The lead screw mechanism 102 can be driven by a stepper motor or a servo motor to provide high-precision linear displacement. A detection groove 103 for placing the workpiece to be measured is opened on the upper side of the frame 1 and on one side of the lead screw mechanism 102. The bottom surface of the detection groove 103 is precision ground to ensure that the workpiece to be measured can obtain a stable and reliable positioning reference surface when placed, thereby reducing the measurement deviation caused by workpiece tilting or unstable placement from the source. The length direction of the detection groove 103 is parallel to the lead screw mechanism 102, and the parallelism error between the two is controlled at the micrometer level, ensuring that the measuring probe always detects along the length direction of the workpiece during the entire movement process.

[0023] like Figure 2As shown, the grating mechanism 2 is a measuring unit. Specifically, the grating mechanism 2 includes a mounting rod 203 and a fixed frame 201 fixedly connected to the frame 1. The nut seat of the lead screw mechanism 102 is rigidly connected to one end of the mounting rod 203. When the lead screw mechanism 102 rotates, it drives the mounting rod 203 to move along the length of the detection groove 103. A sliding groove 202 is provided through the inside of the fixed frame 201, and the mounting rod 203 is inserted into the sliding groove 202, allowing the mounting rod 203 to slide smoothly. To reduce interference from external ambient light sources on the grating signal, a semi-enclosed light-shielding groove 205 is provided inside the sliding groove 202. The grating ruler 207 is tightly attached to the bottom side of the inner wall of the light-shielding groove 205 by bolt connection. A reading head 204 is provided directly above the grating ruler 207. The reading head 204 is fixedly mounted on the mounting rod 203 by an insulating bracket. When the mounting rod 203 moves, the reading head 204 is displaced, and the reading is transmitted through photoelectric... The real-time position information is converted and the reading head 204 is electrically connected to the display screen 101 via a ribbon cable or wire, which can transmit the real-time digital value of the movement trajectory. In addition, in order to ensure that the reading head can still obtain clear moiré fringes inside the light-shielding slot 205 where the light is extremely weak, a long strip-shaped LED supplementary light 206 is fixedly installed on one side of the grating ruler 207. The supplementary light 206 is powered by the DC power supply inside the frame 1 and provides necessary auxiliary lighting for reading. The supplementary light 206 uses optical elements such as a diffuser plate to disperse the light and form a uniform and soft light curtain, illuminating the grating ruler 207 and the reading head 204 from multiple angles, so as not to affect the reading of the reading head 204. The brightness of the supplementary light 206 can be adjusted in multiple levels by the adjustment knob on the frame 1 to adapt to the usage needs under different ambient lighting conditions. The inner wall of the light-shielding slot 205 is coated with a light-absorbing coating, which can effectively absorb scattered light and further reduce the impact of stray light on the quality of the grating signal.

[0024] Furthermore, the frame 1 is provided with removable baffles on both sides. When the baffles are removed, the grating ruler 207 and the reading head 204 can be exposed, and the grating ruler 207 and the reading head 204 can be maintained.

[0025] like Figure 3 , 4As shown in Figure 5, the calibration mechanism 3 includes a rectangular calibration base 301. An inverted T-shaped groove is formed on the bottom surface of the calibration base 301. A high-precision threaded screw 303 is rotatably connected inside the groove. A calibration head 304 is screwed onto the threaded screw 303. Rotating the knob at the end of the threaded screw 303 allows the calibration head 304 to reciprocate within the groove along the measurement direction at the micrometer level. A measuring probe 306 is slidably connected to the lower end face of the calibration head 304 via a dovetail groove structure. A sliding block 305 with a damping rubber ring is provided on the side wall of the calibration head 304. The bottom of the sliding block 305 engages with the upper part of the measuring probe 306. The operator can move the sliding block 305 up and down. 05 is used to coarsely adjust the extension and retraction of the probe. After releasing the hand, the current height position of the measuring probe 306 can be maintained by relying on the sliding damping. This setting can adapt to workpieces of different thicknesses. A sliding resistor block 308 is fixedly connected to the upper side of the calibration head 304, and a sliding resistor rod 307 is fixedly connected in the internal cavity of the calibration base 301. When the calibration head 304 drives the sliding resistor block 308 to slide on the sliding resistor rod 307, a resistance change proportional to the displacement will be generated. The two ends of the sliding resistor rod 307 are connected to the circuit. This electrical signal can be converted into a displacement reading through the display 302 on the outer wall of the calibration base 301, so as to intuitively display the fine adjustment distance of the calibration base 301 during calibration.

[0026] Furthermore, when it is necessary to zero out the display 302: a zero-adjustment knob is provided in the potentiometer circuit formed by the sliding resistor rod 307 and the sliding resistor block 308. The zero-adjustment knob is located on one side of the display 302. The zero-adjustment knob controls the output voltage of the reference voltage source. After the calibration head 304 completes physical zeroing, the operator rotates the zero-adjustment knob. This setting can change the reference voltage so that the input differential voltage of the display 302 is zero.

[0027] The measuring probe 306 in the calibration mechanism 3 serves not only as the reference for probing the length of the calibration head 304, but also as the trigger terminal of the circuit. The measuring probe 306 is made of conductive metal, with a signal wire welded to its tail end. An insulating bushing is provided between its outer wall and the mounting rod 203 and the calibration head 304 to achieve electrical isolation. This signal wire is connected to the device's electrical control system, forming a normally open trigger circuit. In this embodiment, the frame 1 or the workpiece itself needs to be used as a ground wire or the other pole connected to the circuit. When the lead screw mechanism 102 drives the mounting rod 203 and the measuring probe 306 forward, the measuring probe... When the tip of the probe 306 touches the surface of the metal workpiece to be tested in the detection groove 103, the trigger circuit is instantly turned on, generating a level transition signal. This signal is used as an external interrupt input to the control module built into the display screen 101. After receiving the interrupt signal, the control module immediately executes the latching instruction, that is, stops refreshing the data, locks the absolute position data acquired by the reading head 204 at this moment, and keeps it displayed on the screen of the display screen 101. This setting realizes the precise synchronization of the electronically controlled action of the probe contacting the workpiece surface and the display reading latching, eliminating the delay error caused by human observation and manual pressing to stop.

[0028] Furthermore, a micro switch or strain gauge sensor can be installed inside the tail end of the measuring probe 306. When the tip of the probe contacts the surface of the workpiece to be tested, the small axial reaction force on the probe bar immediately triggers the micro switch or causes the strain gauge to deform, thereby outputting a trigger signal. With this setting, the measuring probe 306 can be independent of the conductivity of the workpiece itself, making this device suitable for precision measurement of various non-metallic workpieces such as plastics and ceramics, greatly expanding the application range of this device.

[0029] like Figure 7 and 8 As shown, when measuring irregular workpieces, they need to be firmly positioned in the detection groove 103. The limiting mechanism 4 is vertically set on the side wall of the detection groove 103. The side plate of the frame 1 has threaded holes. One end of the spiral rod 401 located inside the frame 1 is movably connected to the limiting push rod 402 through a rotary joint. When the external spiral rod 401 is rotated, the limiting push rod 402 will not rotate with it, but will slide straight in and out in the detection groove 103. In order to adapt to the surface of the workpiece with burrs, the push plate of the limiting push rod 402 has several blind holes drilled in a row inside. Each blind hole has a fixed spring 404 at the bottom. The front end of the fixed spring 404 is fixedly connected to an independent spring block 403. When the limiting push rod 402 is pushed out, multiple spring blocks 403 first contact the workpiece surface and compress the fixed spring 404 behind them, forming a multi-point floating support, so that the limiting push rod 402 can adaptively fit the irregular concave and convex surfaces of the workpiece to be tested, and achieve stable clamping of irregular workpieces.

[0030] Specifically, each spring block 403 has cross-knurled or serrated textures on its end face to increase the friction between it and the workpiece surface and prevent the workpiece from slipping during measurement; the fixed spring 404 is made of stainless steel spring wire and has a passivated surface, which has good corrosion resistance and fatigue resistance.

[0031] Furthermore, after the workpiece to be measured is placed in, the rotating screw 401 uses the spring block 403 to float and clamp the workpiece, and the lead screw mechanism 102 is activated. The mounting rod 203 drives the measuring probe 306 to move smoothly towards the workpiece. At the instant the tip of the measuring probe 306 contacts the surface of the workpiece, the trigger circuit is turned on, generating a trigger signal; and the high-precision final result is displayed on the screen. At this time, the device simultaneously completes the triggering, latching and automatic error compensation to complete the measurement steps. The entire measurement process, from the measuring probe contacting the workpiece to the display showing the final accurate measurement result, is completed automatically in an instant. The operator does not need to perform any manual calculations or data corrections, which significantly improves the measurement efficiency and accuracy.

[0032] Based on the above technical solution, this embodiment of the invention also provides the working principle of a grating digital display device with synchronous triggering function, including the following: First, the workpiece to be measured is placed inside the detection groove 103. The rotating screw rod 401 causes multiple spring blocks 403 at the front end of the limiting push rod 402 to compress the fixed springs 404 behind them according to the unevenness of the workpiece surface, forming multi-point floating support. This, combined with the anti-slip texture on the end face of the spring blocks 403, achieves stable clamping of the irregularly shaped workpiece. If the workpiece thickness changes, the extension and retraction of the measuring probe 306 can be coarsely adjusted by moving the sliding block 305, while the damping rubber ring maintains its height position. Then, the lead screw mechanism 102 is activated, the mounting rod 203 moves along the direction of the detection groove 103, the reading head 204 is displaced relative to the grating ruler 207, the light-shielding groove 205 can block external stray light, and the supplementary light 206 provides uniform auxiliary illumination to ensure... The signal is clear. When the tip of the measuring probe 306 contacts the surface of the workpiece to be tested, the trigger circuit consisting of the conductive probe, signal wire, workpiece, and frame 1 is activated, generating a level transition signal. This signal serves as an external interrupt input to the display screen 101 control module. The module prioritizes latching the current absolute position data of the reading head 204 within microseconds. The control module synchronously acquires the voltage value of the sliding resistor 307 circuit and converts it into offset data shown on the display 302. This offset originates from systematic errors caused by probe wear or manual adjustment of the calibration head 304 position. Because the mounting rod 203 is rigidly connected to the calibration base 301, this error is proportionally transmitted to the reading head 204. The control module performs a difference calculation, subtracting the offset from the absolute position data to obtain the final accurate measurement value after eliminating systematic errors, which is then latched and displayed on the display screen 101. The entire triggering, latching, and compensation process is completed automatically in an instant, eliminating the need for manual calculation and correction by the operator.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grating digital display device with a synchronous trigger function, characterized in that, include: A frame (1) is provided with a display screen (101) mounted on the frame (1). A lead screw mechanism (102) is provided below the display screen (101). A detection groove (103) is provided on one side of the lead screw mechanism (102). A grating mechanism (2) is provided on the lead screw mechanism (102). The grating mechanism (2) includes a reading head (204) and a grating ruler (207). The grating mechanism (2) can perform length detection on the workpiece to be detected inside the detection groove (103). A calibration mechanism (3) is provided on the grating mechanism (2). The calibration mechanism (3) includes a calibration seat (301). The calibration seat (301) can calibrate the detection base point of the grating mechanism (2).

2. The grating digital display device with a synchronous trigger function according to claim 1, characterized in that, The reading head (204) is electrically connected to the display screen (101), and the display screen (101) can display the numbers on the reading head (204).

3. The grating digital display device with synchronous triggering function according to claim 1, characterized in that, The grating mechanism (2) further includes a mounting rod (203) and a fixing frame (201). The lead screw mechanism (102) drives the mounting rod (203) to move. The fixing frame (201) is fixedly connected to the frame (1). A sliding groove (202) is provided on the fixing frame (201). The mounting rod (203) slides inside the sliding groove (202). A light-shielding groove (205) is provided inside the sliding groove (202). A grating ruler (207) is installed on the bottom side of the inner wall of the light-shielding groove (205). A reading head (204) is provided above the grating ruler (207). The reading head (204) is installed on the mounting rod (203). The fixing frame (201) can shield the reading head (204) and the grating ruler (207) to reduce the light interference of external light sources on the reading head (204).

4. The grating digital display device with synchronous triggering function according to claim 3, characterized in that, A supplementary light (206) is provided on one side of the grating ruler (207). The supplementary light (206) is installed inside the light-shielding groove (205). The supplementary light (206) provides supplementary lighting to the inside of the light-shielding groove (205).

5. The grating digital display device with synchronous triggering function according to claim 3, characterized in that, The calibration seat (301) is mounted on the mounting rod (203). A groove is provided on the bottom side of the calibration seat (301). A threaded screw (303) is rotatably connected inside the groove. A calibration head (304) is screwed onto the threaded screw (303). The calibration head (304) slides back and forth inside the groove through the threaded screw (303).

6. The grating digital display device with synchronous triggering function according to claim 5, characterized in that, A measuring probe (306) is slidably connected to the lower side of the calibration head (304). A sliding block (305) is provided on one side of the calibration head (304). The sliding block (305) drives the measuring probe (306) to move up and down. A sliding damping is provided at the connection between the sliding block (305) and the calibration head (304).

7. The grating digital display device with synchronous triggering function according to claim 6, characterized in that, A sliding resistor block (308) is fixedly connected to the upper side of the calibration head (304), and a sliding resistor rod (307) is installed inside the calibration base (301). When the calibration head (304) moves, it drives the sliding resistor block (308) to slide on the sliding resistor rod (307). A display (302) is installed on the calibration base (301), and the display (302) can display the reading generated when the sliding resistor rod (307) and the sliding resistor block (308) slide together.

8. The grating digital display device with synchronous triggering function according to claim 1, characterized in that, A limiting mechanism (4) is provided on one side of the detection groove (103). The limiting mechanism (4) includes a limiting push rod (402). The limiting push rod (402) slides inside the detection groove (103). A screw rod (401) is screwed on the frame (1). When the screw rod (401) rotates, it drives the limiting push rod (402) to slide.

9. The grating digital display device with synchronous triggering function according to claim 8, characterized in that, The limiting push rod (402) has multiple fixed springs (404) installed inside. Multiple spring blocks (403) are fixedly connected to the fixed springs (404). The spring blocks (403) cooperate with the limiting push rod (402) to clamp the irregular surface of the workpiece to be tested inside the detection groove (103).

10. The grating digital display device with synchronous triggering function according to claim 6, characterized in that, When the measuring probe (306) comes into contact with the workpiece to be measured, it forms a trigger circuit; the trigger circuit is connected to the electronic control system of the display screen (101), and the display screen (101) simultaneously latches the position data of the current reading head (204) the instant the circuit is turned on.

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