Automatic length measuring mechanism with laser

Abstract

The invention provides an automatic length measuring mechanism with laser, and relates to the technical field of industrial production. The automatic length measuring mechanism with the laser comprises a base, a pneumatic measuring unit, a displacement sensor and an electric control system, the electric control system is fixedly connected with the base through a screw, the pneumatic measuring unit is fixedly connected with the base through a screw, and the displacement sensor is installed on the pneumatic measuring unit; the base is formed by connecting a sliding table body and a sliding table sliding block through a lead screw. The pneumatic measuring unit comprises a bottom plate, a connecting plate, a mounting plate, a connecting shaft, an air cylinder, a guide rail sliding block, a linear guide rail and a baffle, the linear guide rail is mounted on the bottom plate through a screw, and the guide rail sliding block is slidably connected through a clamping groove in the linear guide rail. Laser non-contact measurement and dual data acquisition are adopted, and long-term stability of precision is guaranteed; the modular design is high in adaptability, the efficiency is improved through automatic linkage, data can be traced, and the operation and maintenance cost and the integration difficulty are reduced.

Description

Technical Field

[0001] This invention relates to the field of industrial production technology, specifically to an automatic length measuring mechanism with laser. Background Technology

[0002] In industrial production and precision manufacturing, length measurement is a crucial link in controlling product quality and ensuring the stability of production processes. Its measurement accuracy and efficiency directly affect product qualification rate and production efficiency. Among traditional length measurement methods, mechanical contact measurement is widely used. This type of measurement calculates length by transmitting displacement signals through direct contact between the probe and the workpiece surface. However, over long-term use, the probe is prone to wear due to friction, leading to a gradual decrease in measurement accuracy. Furthermore, the contact pressure can easily cause damage such as squeezing deformation and surface scratches to soft, fragile, or irregularly shaped workpieces, limiting its application in high-precision and special material workpiece measurement scenarios. Manual measurement relies on the operator's experience and operational standards, resulting in low measurement efficiency and significant measurement errors due to subjective judgment differences, making it difficult to adapt to the automation and mass production requirements of modern production lines. As industrial manufacturing develops towards high precision and intelligence, the shortcomings of traditional length measurement methods in terms of measurement accuracy stability, workpiece adaptability, and automation integration are becoming increasingly apparent.

[0003] Therefore, there is an urgent need for a length measuring mechanism that can combine non-contact measurement, high-precision output, and automated linkage to fill the existing technological gap and meet the stringent requirements of quality control throughout the entire industrial production process. Summary of the Invention

[0004] Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides an automatic length measuring mechanism with laser, which solves the problems of traditional contact length measuring methods that easily cause workpiece damage, accuracy decay with wear, and low efficiency and large errors in manual measurement.

[0006] Technical solution

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An automatic length measuring mechanism with laser includes: a base, a pneumatic measuring unit, a displacement sensor, and an electronic control system. The electronic control system is fixedly connected to the base by screws, the pneumatic measuring unit is fixedly connected to the base by screws, and the displacement sensor is mounted on the pneumatic measuring unit.

[0009] The base is composed of a slide body and a slide slider connected by a lead screw;

[0010] The pneumatic measurement unit includes a base plate, a connecting plate, a mounting plate, a connecting shaft, a cylinder, a guide rail slider, a linear guide rail, and a baffle. The linear guide rail is mounted on the base plate with screws, and the guide rail slider is slidably connected through a slot on the linear guide rail. The connecting plate is fixedly connected to the guide rail slider and the mounting plate with screws. The cylinder is mounted on the base plate and its front end is connected to the connecting shaft. The connecting shaft is mounted on the side of the connecting plate. The baffle is mounted on one end of the linear guide rail and fixedly connected to the base plate with screws. The displacement sensor consists of a displacement sensor body and several connecting plates.

[0011] The electrical control system includes a servo motor, a drive power supply, and a PLC.

[0012] Preferably, the displacement sensor integrates a laser detection module, which is used to emit a laser beam to the surface of the product to be tested and receive the reflected laser.

[0013] Preferably, the slide block achieves linear motion along the slide body through a lead screw drive, thereby driving the pneumatic measurement unit and displacement sensor to perform large-range coarse positioning.

[0014] Preferably, when the cylinder is activated, it drives the connecting plate to move via the connecting shaft. The connecting plate drives the mounting plate and displacement sensor to make precise linear feed along the linear guide rail via the guide rail slider. The baffle is used to limit the stroke of the guide rail slider to avoid overtravel collision.

[0015] Preferably, the displacement sensor can simultaneously collect laser ranging data and mechanical displacement data during the feeding process of the pneumatic measurement unit, and transmit the data to the PLC of the electronic control system in real time.

[0016] Preferably, the PLC has a built-in measurement algorithm for integrating, calibrating, and calculating laser ranging data and mechanical displacement data. By comparing the initial position coordinates of the detection end with the real-time position coordinates of the product after detection, and combining the compensation data from the laser ranging, the actual length and dimensions of the product can be calculated, and the measurement data can be stored or uploaded.

[0017] Preferably, an end-fixed installation structure is adopted, which is fixed to the equipment frame by positioning pins. The base can perform vertical lifting and lowering movements. The lifting stroke is controlled by a servo motor or limit switch, and the positioning accuracy is ≤ ±0.01mm.

[0018] Preferably, the lifting action of the base and the horizontal feeding action of the pneumatic measuring unit are automatically linked through a PLC control system, and the timing and stroke parameters can be flexibly adjusted according to the testing requirements of different product specifications.

[0019] Beneficial effects

[0020] This invention provides an automatic length measuring mechanism with a laser. It has the following advantages:

[0021] 1. This invention provides an automatic length measuring mechanism with a laser. This mechanism employs a non-contact laser ranging principle, combined with servo motor pulse closed-loop control and pneumatic precision feeding technology. It completely avoids the risks of workpiece extrusion deformation and surface wear associated with traditional contact measurements, significantly improving the adaptability to measuring soft, fragile, irregularly shaped, and high-precision workpieces. The high collimation and dual data acquisition mechanism of the laser detection module ensure long-term stable measurement accuracy, effectively reducing accuracy degradation caused by component wear, providing reliable data support for product quality control, and optimizing quality control in industrial production.

[0022] 2. This invention provides an automatic length measuring mechanism with laser. This mechanism achieves automated linkage of various action units through a PLC control system, integrating large-range coarse positioning and precise feeding functions. It completes the entire measurement process without manual intervention, significantly improving measurement efficiency and adapting to the batch operation requirements of automated production lines. The modular structural design makes the mechanism compact and can be directly embedded into existing production stations without the need for separate measurement space planning. Furthermore, the high versatility of components reduces spare parts procurement and maintenance costs. Simultaneously, it supports real-time transmission, storage, and traceability of measurement data, promoting the digital management upgrade of industrial production. Attached Figure Description

[0023] Figure 1 This is an isometric view of the present invention;

[0024] Figure 2 This is a front view schematic diagram of the present invention;

[0025] Figure 3 This is a bottom-view axial side view of the present invention;

[0026] Figure 4 This is a schematic diagram of the axonal side of the pneumatic measurement unit of the present invention.

[0027] The components are as follows: 1. Base; 2. Pneumatic measurement unit; 3. Displacement sensor; 4. Electrical control system; 11. Slide body; 12. Slide slider; 21. Base plate; 22. Connecting plate; 23. Mounting plate; 24. Connecting shaft; 25. Cylinder; 26. Guide rail slider; 27. Linear guide rail; 28. Baffle. Detailed Implementation

[0028] The technical solutions of 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.

[0029] like Figure 1-4 As shown, this embodiment of the invention provides an automatic length measuring mechanism with laser, including: a base 1, a pneumatic measuring unit 2, a displacement sensor 3 and an electronic control system 4. The electronic control system 4 is fixedly connected to the base 1 by screws, the pneumatic measuring unit 2 is fixedly connected to the base 1 by screws, and the displacement sensor 3 is installed on the pneumatic measuring unit 2.

[0030] Specifically, in the above embodiments, the components are rigidly fixed by standardized screw connections. The connection strength meets the vibration environment requirements of industrial field operations, ensuring the stability of the relative positions between components during measurement and providing a structural foundation for improved measurement accuracy. The screw selection is compatible with the mounting hole specifications of each component, and the assembly process is simple and convenient, reducing the operational difficulty of equipment assembly and maintenance.

[0031] The base 1 is composed of a slide body 11 and a slide slider 12 connected by a screw. It adopts an end-fixed installation structure and is fixed to the equipment frame by a positioning pin. The base 1 can perform vertical lifting and lowering movements. The lifting stroke is controlled by a servo motor or limit switch. The positioning accuracy is ≤ ±0.01mm. The slide slider 12 achieves linear movement along the slide body 11 through screw drive, thereby driving the pneumatic measurement unit 2 and displacement sensor 3 to perform large-range coarse positioning.

[0032] The pneumatic measurement unit 2 includes a base plate 21, a connecting plate 22, a mounting plate 23, a connecting shaft 24, a cylinder 25, a guide rail slider 26, a linear guide rail 27, and a baffle 28. The linear guide rail 27 is mounted on the base plate 21 with screws, and the guide rail slider 26 is slidably connected to the linear guide rail 27 through a slot. The connecting plate 22 is fixedly connected to the guide rail slider 26 and the mounting plate 23 with screws. The cylinder 25 is mounted on the base plate 21 and its front end is axially connected to the connecting shaft 24. The connecting shaft 24 is mounted on the side of the connecting plate 22. The baffle 28 is mounted on one end of the linear guide rail 27 and fixedly connected to the base plate 21 with screws. The displacement sensor 3 consists of a displacement sensor body and several connecting plates.

[0033] Specifically, in the above-described embodiments, the linear guide 27 adopts a high-precision ball bearing guide structure with a guiding accuracy of ≤±0.005mm / m, which can effectively limit the rotation and offset of moving parts and reduce frictional resistance during translation. The base plate 21 is made of high-strength aluminum alloy, which combines structural rigidity and lightweight characteristics, ensuring the flatness requirements of component installation while reducing the overall weight of the mechanism, making it easy to integrate into various production equipment.

[0034] The electrical control system 4 includes a servo motor, a drive power supply, and a PLC. The PLC has a built-in measurement algorithm for integrating, calibrating, and calculating laser ranging data and mechanical displacement data. By comparing the initial position coordinates of the detection end with the real-time position coordinates of the detected product, and combining the compensation data from the laser ranging, the actual length and dimensions of the product can be calculated, and the measurement data can be stored or uploaded.

[0035] Specifically, in the above embodiments, the servo motor adopts a pulse closed-loop control mode, achieving a position control accuracy of ±1 pulse equivalent. The output voltage stability of the drive power supply is ≤±0.5%, providing power assurance for the smooth operation of the motor. The PLC uses an industrial-grade programmable controller with a computation response time ≤1ms. The built-in measurement algorithm has undergone multiple iterations and optimizations, enabling rapid data integration and calibration. The measurement data storage capacity is no less than 100,000 sets, and it supports dual-interface data transmission via Ethernet and RS485, meeting the data management needs of different production scenarios.

[0036] The displacement sensor 3 integrates a laser detection module, which is used to emit a laser beam to the surface of the product to be measured and receive the reflected laser.

[0037] Specifically, in the above-described embodiment, the laser detection module emits a laser with a wavelength of 635nm and a laser beam divergence angle ≤0.1mrad. High collimation ensures that the laser energy is concentrated on the area to be measured, improving the accuracy of distance measurement. The laser receiving unit has a response time ≤2μs, enabling rapid capture of reflected laser signals, adapting to dynamic measurement requirements under high-speed feeding conditions, and expanding the applicable measurement speed range of the mechanism.

[0038] When the cylinder 25 is activated, it drives the connecting plate 22 to move through the connecting shaft 24. The connecting plate 22 drives the mounting plate 23 and the displacement sensor 3 to make precise linear feed along the linear guide rail 27 through the guide rail slider 26. The baffle 28 is used to limit the stroke of the guide rail slider 26 to avoid overtravel collision.

[0039] Specifically, in the above-described embodiment, the working pressure adjustment range of cylinder 25 is 0.4-0.8 MPa, and the piston rod feed speed can be steplessly adjusted within 50-200 mm / s to adapt to the measurement distance and detection rhythm requirements of different products. The baffle 28 is made of elastic buffer material, and its impact absorption when in contact with the guide rail slider 26 is ≥80%, thus achieving both stroke limiting and reducing damage to components from collisions, extending the service life of the equipment.

[0040] The displacement sensor 3 can simultaneously collect laser ranging data and mechanical displacement data during the feeding process of the pneumatic measurement unit 2, and transmit the data to the PLC of the electronic control system 4 in real time;

[0041] Specifically, in the above-described embodiment, the laser ranging data is acquired at a frequency of 1000Hz, and the mechanical displacement data is acquired at a resolution of 0.001mm. This dual data acquisition mechanism provides complementary verification, effectively offsetting errors that may arise from a single measurement method. Data transmission employs differential signal transmission, significantly improving anti-interference capabilities and avoiding the impact of electromagnetic interference in industrial settings on data transmission, thus ensuring the integrity and accuracy of data transmission.

[0042] The lifting and lowering motion of the base 1 and the horizontal feeding motion of the pneumatic measuring unit 2 are automatically linked through the PLC control system. The timing and stroke parameters of the motion can be flexibly adjusted according to the testing requirements of different product specifications.

[0043] Specifically, in the above specific embodiments, the PLC realizes motion logic control through modular programming. The timing interval between lifting and horizontal feeding actions can be accurately set within 0.1-1s. The stroke parameters can be adjusted by inputting through the touch screen or issuing instructions from the host computer. It can adapt to the measurement needs of different sizes and types of products without modifying the mechanical structure, significantly improving the versatility and application flexibility of the mechanism.

[0044] Working principle: During the initial positioning phase, the PLC in the electronic control system 4 sends a command to drive the servo motor. The servo motor drives the lead screw in the base 1 to rotate, which in turn drives the slide block 12 to move linearly along the slide body 11, moving the pneumatic measuring unit 2 and displacement sensor 3 to the approximate detection area of ​​the product to be measured, laying the foundation for accurate measurement. During the precise feeding phase, the electronic control system 4 triggers the cylinder 25 to move. The piston rod of the cylinder 25 drives the connecting plate 22 to move through the connecting shaft 24. The connecting plate 22 is rigidly connected to the guide rail slider 26, which in turn drives the mounting plate 23 and displacement sensor 3 to make a smooth and precise linear feed along the linear guide rail 27 until the laser detection end approaches the part of the product to be measured. The baffle 28 limits the stroke of the guide rail slider 26 to avoid overtravel collision. During the laser detection phase, the laser module of displacement sensor 3 emits a laser beam onto the surface of the product to be measured. The reflected laser is received by the sensor, which obtains the distance between the detection end and the product surface through the reflection time difference or phase difference. Simultaneously, displacement sensor 3 collects mechanical displacement data during the feeding process of pneumatic measurement unit 2, achieving dual data acquisition. In the data processing phase, displacement sensor 3 transmits the collected laser ranging data and mechanical displacement data to the PLC in real time. The PLC integrates, calibrates, and calculates the data using its built-in measurement algorithm. Combining the initial and real-time position coordinates of the detection end with the laser ranging compensation data, it calculates the actual length and dimension of the product and completes data storage or uploading. In the reset and recovery phase, the piston rod of cylinder 25 retracts, causing displacement sensor 3 to return to its initial position. The servo motor reverses, driving the slide block 12 to reset, retracting the entire measurement unit into a safe area, awaiting the next measurement command.

[0045] 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. An automatic length measuring mechanism with laser, characterized in that, include: The base (1), pneumatic measurement unit (2), displacement sensor (3) and electronic control system (4) are provided. The electronic control system (4) is fixedly connected to the base (1) by screws. The pneumatic measurement unit (2) is fixedly connected to the base (1) by screws. The displacement sensor (3) is installed on the pneumatic measurement unit (2). The base (1) is composed of a slide body (11) and a slide slider (12) connected by a lead screw; The pneumatic measurement unit (2) includes a base plate (21), a connecting plate (22), a mounting plate (23), a connecting shaft (24), a cylinder (25), a guide rail slider (26), a linear guide rail (27), and a baffle (28). The linear guide rail (27) is mounted on the base plate (21) with screws. The guide rail slider (26) is slidably connected to the linear guide rail (27) through a slot. The connecting plate (22) is fixedly connected to the guide rail slider (26) and the mounting plate (23) with screws. The cylinder (25) is mounted on the base plate (21) and its front end is axially connected to the connecting shaft (24). The connecting shaft (24) is mounted on the side of the connecting plate (22). The baffle (28) is mounted on one end of the linear guide rail (27) and fixedly connected to the base plate (21) with screws. The displacement sensor (3) consists of a displacement sensor body and several connecting plates. The electrical control system (4) includes a servo motor, a drive power supply, and a PLC.

2. The automatic length measuring mechanism with laser according to claim 1, characterized in that, The displacement sensor (3) integrates a laser detection module, which is used to emit a laser beam to the surface of the product to be tested and receive the reflected laser.

3. The automatic length measuring mechanism with laser according to claim 1, characterized in that, The slide block (12) achieves linear motion along the slide body (11) through screw drive, thereby driving the pneumatic measurement unit (2) and displacement sensor (3) to perform large-range coarse positioning.

4. The automatic length measuring mechanism with laser according to claim 1, characterized in that, When the cylinder (25) is activated, it drives the connecting plate (22) to move through the connecting shaft (24). The connecting plate (22) drives the mounting plate (23) and displacement sensor (3) to make precise linear feed along the linear guide rail (27) through the guide rail slider (26). The baffle (28) is used to limit the stroke of the guide rail slider (26) to avoid overtravel collision.

5. The automatic length measuring mechanism with laser according to claim 2, characterized in that, The displacement sensor (3) can simultaneously collect laser ranging data and mechanical displacement data during the feeding process of the pneumatic measurement unit (2), and transmit the data to the PLC of the electronic control system (4) in real time.

6. The automatic length measuring mechanism with laser according to claim 1, characterized in that, The PLC has a built-in measurement algorithm for integrating, calibrating, and calculating laser ranging data and mechanical displacement data. By comparing the initial position coordinates of the detection end with the real-time position coordinates of the product after detection, and combining the compensation data from the laser ranging, the actual length and dimensions of the product can be calculated, and the measurement data can be stored or uploaded.

7. The automatic length measuring mechanism with laser according to claim 1, characterized in that, The end-fixed installation structure is adopted and is fixed to the equipment frame by positioning pins. The base (1) can perform vertical lifting action. The lifting stroke is controlled by servo motor or limit switch, and the positioning accuracy is ≤ ±0.01mm.

8. The automatic length measuring mechanism with laser according to claim 1, characterized in that, The lifting action of the base (1) and the horizontal feeding action of the pneumatic measurement unit (2) are automatically linked through the PLC control system. The timing and stroke parameters of the action can be flexibly adjusted according to the testing requirements of different product specifications.

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