Automatic protective cover for laser displacement sensor

Abstract

The utility model discloses an automatic protective cover for a laser displacement sensor, belongs to the technical field of numerical control machining, and solves the problem that the laser displacement sensor is polluted by splashing scrap iron. Comprising a lathe and a vertical support fixedly connected to the lathe through a horizontal clamp, the vertical support is fixedly connected with a laser displacement sensor through a sensor clamp, the vertical support is fixedly connected with a steering engine, and the movable end of the steering engine is fixedly connected with a swing arm. The swing arm is detachably connected with a protective cover capable of shielding the laser displacement sensor. Through the automatic protection design, the laser displacement sensor can be effectively prevented from being polluted by splashed scrap iron, long-term stable work of the laser displacement sensor is ensured, the high requirements of a modern automatic production line for real-time accurate measurement and equipment protection are met, meanwhile, the production efficiency is improved, manual intervention is reduced, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining technology, and in particular to an automatic protective cover for a laser displacement sensor. Background Technology

[0002] In the field of CNC machining, with the continuous development of production processes, the requirements for workpiece machining accuracy are becoming increasingly stringent. Traditional manual inspection methods can no longer meet the demands for efficient and high-precision machining. To achieve high-precision and high-efficiency machining processes, the adoption of online measurement technology has become an important development trend in the machining field.

[0003] Online measurement systems often utilize laser displacement sensors to collect machining data. During CNC lathe machining, laser displacement sensors are widely used to monitor the position and dimensions of the workpiece, ensuring machining accuracy and workpiece quality. However, metal shavings generated during cutting can impact the sensor surface, potentially reducing measurement accuracy or even causing equipment malfunctions. This not only increases the complexity of equipment maintenance but can also lead to sensor short circuits and other failures, resulting in production interruptions and downtime, and increasing maintenance costs for the company.

[0004] Existing protective measures are mostly manually installed or fixed covers, which have many shortcomings. First, manual covers require operators to install and remove them, increasing manual intervention and reducing production efficiency. Second, existing covers are usually fixed in design and cannot be flexibly adjusted according to production needs, which may affect the working range and measurement angle of the sensors, failing to meet the requirements of efficient automated production lines.

[0005] Therefore, traditional manual protection measures cannot effectively address the dual needs of real-time measurement and equipment protection.

[0006] Therefore, an automatic protective cover for laser displacement sensors is proposed to solve or alleviate the above problems. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing an automatic protective cover for laser displacement sensors. This cover can automatically flip during CNC machining to protect the laser displacement sensor from damage caused by metal chips during the cutting process, thus ensuring measurement accuracy.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An automatic protective cover for a laser displacement sensor includes a lathe and a vertical bracket fixedly connected to the lathe via a horizontal fixture. A laser displacement sensor is fixedly connected to the vertical bracket via a sensor fixture. A servo motor is fixedly connected to the vertical bracket. A swing arm is fixedly connected to the movable end of the servo motor. A protective cover for shielding the laser displacement sensor is detachably connected to the swing arm.

[0010] Preferably, the servo motor is coupled to a controller, and the controller is coupled to an anti-interference main control circuit. The anti-interference main control circuit collects and detects 20kHz~80kHz ultrasonic pulses generated by debris splashing and transmits the signal to the controller to control the operation of the servo motor.

[0011] Preferably, the anti-interference main control circuit includes an ultrasonic microphone, a vibration monitoring branch, an ultrasonic signal main channel module, and logic and power circuits;

[0012] The ultrasonic microphone is mounted on a vertical bracket and is used to collect 20kHz~80kHz ultrasonic pulses generated by debris splash and output signals. The output end of the ultrasonic microphone is coupled to the input end of the ultrasonic signal main channel module. The output end of the ultrasonic signal main channel module is connected to the first input end of the logic and power module. The output end of the vibration monitoring branch module is connected to the second input end of the logic and power module. The power output end of the logic and power module supplies power to the ultrasonic signal main channel module and the vibration monitoring branch module. The trigger output end of the logic and power module is connected to the input end of the controller.

[0013] Preferably, the main channel module for ultrasonic signals includes a preamplifier AD8421, a high-pass filter, a band-pass filter, a notch filter, an envelope detector LF398, and a window comparator LM393.

[0014] The input of the preamplifier AD8421 is coupled to the signal output pin of the ultrasonic microphone. The output pin of the preamplifier AD8421 is connected to the input pin of the high-pass filter. The output pin of the high-pass filter is connected to the input pin of the band-pass filter. The output pin of the band-pass filter is connected to the input pin of the notch filter. The output pin of the notch filter is connected to the input pin of the envelope detector. The output pin of the envelope detector LF398 is connected to the window comparator LM393. The output pin of the window comparator LM393 is connected to the input pin of the logic and power module.

[0015] Preferably, the vibration monitoring branch includes a low-pass filter, an analog signal memory LF398, and a comparator LM311. The input pin of the low-pass filter is coupled to the signal output pin of the ultrasonic microphone, the output pin of the low-pass filter is connected to the input pin of the analog signal memory LF398, the output pin of the analog signal memory LF398 is connected to the non-inverting input pin of the comparator LM311, and the output pin of the comparator LM311 is connected to the input pin of the logic and power module.

[0016] Preferably, the logic and power supply circuit includes a logic AND gate CD4081 and a power supply filter circuit. The output pin of the logic AND gate CD4081 is coupled to the input terminal of the controller, and the power supply filter circuit is connected to the power supply and outputs ±12V.

[0017] Preferably, the power filtering circuit includes a DC / DC power module, the input terminal of which is connected to a power source.

[0018] This utility model has the following beneficial effects:

[0019] This invention, through its automated protective design, effectively prevents splashed iron filings from contaminating the laser displacement sensor, ensuring its long-term stable operation. It aims to meet the high requirements of modern automated production lines for real-time accurate measurement and equipment protection, while improving production efficiency, reducing manual intervention, and lowering maintenance costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0023] Figure 3 This is a structural block diagram of the anti-interference main control circuit in this utility model.

[0024] 1. Vertical support; 2. Horizontal clamp; 3. Protective cover; 4. Sensor clamp; 5. Laser displacement sensor; 6. Swing arm; 7. Servo motor; 8. Ultrasonic microphone; 9. Vibration monitoring branch; 10. Ultrasonic signal main channel module; 11. Logic and power circuit; 12. Controller. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] An automatic protective cover for a laser displacement sensor, such as Figure 1 and Figure 2 As shown, it includes a lathe and a vertical support 1 fixedly connected to the lathe by a horizontal fixture 2. A laser displacement sensor 5 is fixedly connected to the vertical support 1 by a sensor fixture 4. A servo motor 7 is fixedly connected to the vertical support 1. A swing arm 6 is fixedly connected to the movable end of the servo motor 7. A protective cover 3 that can shield the laser displacement sensor 5 is detachably connected to the swing arm 6.

[0032] By installing a protective cover 3 on the laser displacement sensor 5, this utility model can effectively prevent iron chips flying during the cutting process from hitting the surface of the laser displacement sensor 5, thereby preventing errors from occurring in the laser displacement sensor 5. This structural design ensures that the sensor can always maintain accurate measurement during operation and avoids measurement errors caused by iron chips.

[0033] Furthermore, traditional protective measures require operators to manually install and remove the protective cover 3, increasing labor costs and disrupting the production process. In contrast, the flip-up protective cover 3 of this invention can flip and unfold according to the processing procedure, automatically protecting the sensors and greatly reducing the need for manual intervention. Through this automated design, this invention significantly improves the automation level of the production line, reduces the inconvenience caused by manual operation, and minimizes the impact of human factors on production efficiency.

[0034] Its simple structure and automated control design eliminate the need for complex manual operations. Its compact and reliable design allows for seamless integration with existing CNC machining systems, facilitating easy installation. Operators only need to perform basic settings and adjustments, requiring minimal intervention during operation, greatly enhancing the ease of operation of the production line.

[0035] Traditional manual protective covers 3 and sensors often require frequent cleaning and maintenance due to iron filings contamination, increasing the risk of equipment failure and maintenance costs. By using this flip-up protective cover 3, iron filings can be effectively prevented from flying and damaging the sensor, reducing the occurrence of equipment failures. This not only extends the service life of the laser displacement sensor 5 and related equipment, but also reduces the frequency of maintenance and replacement of parts, thereby reducing the company's long-term maintenance costs.

[0036] like Figure 3 As shown, the servo motor 7 is coupled to the controller 12, and the controller 12 is coupled to the anti-interference main control circuit. The anti-interference main control circuit collects and detects the 20kHz~80kHz ultrasonic pulses generated by debris splashing and transmits the signal to the controller 12 to control the operation of the servo motor 7.

[0037] The anti-interference main control circuit includes an ultrasonic microphone 8, a vibration monitoring branch 9, an ultrasonic signal main channel module 10, and a logic and power supply circuit 11.

[0038] An ultrasonic microphone 8 is mounted on a vertical support 1. It is used to collect ultrasonic pulses of 20kHz~80kHz generated by debris splash and output signals. The output end of the ultrasonic microphone 8 is coupled to the input end of the ultrasonic signal main channel module 10. The output end of the ultrasonic signal main channel module 10 is connected to the first input end of the logic and power module. The output end of the vibration monitoring branch 9 module is connected to the second input end of the logic and power module. The power output end of the logic and power module supplies power to the ultrasonic signal main channel module 10 and the vibration monitoring branch 9 module. The trigger output end of the logic and power module is connected to the input end of the controller 12.

[0039] The main channel module 10 for ultrasonic signals includes a preamplifier AD8421, a high-pass filter, a band-pass filter, a notch filter, an envelope detector LF398, and a window comparator LM393.

[0040] The input of the preamplifier AD8421 is coupled to the signal output pin of the ultrasonic microphone 8. A gain resistor with a resistance of 499Ω is connected between pin 1 and pin 8 of the preamplifier AD8421. The output pin of the preamplifier AD8421 is connected to the input pin of the high-pass filter. The output pin of the high-pass filter is connected to the input pin of the band-pass filter. The high-pass filter is a third-order Sallen-Key structure. The output pin of the band-pass filter is connected to the input pin of the notch filter. The output pin of the notch filter is connected to the input pin of the envelope detector. The output pin of the envelope detector LF398 is connected to the window comparator LM393. The output pin of the window comparator LM393 is connected to the input pin of the logic and power module.

[0041] Vibration monitoring branch 9 includes a low-pass filter, an analog signal memory LF398, and a comparator LM311. The input pin of the low-pass filter is coupled to the signal output pin of the ultrasonic microphone 8. The output pin of the low-pass filter is connected to the input pin of the analog signal memory LF398. The output pin of the analog signal memory LF398 is connected to the non-inverting input pin of the comparator LM311. The output pin of the comparator LM311 is connected to the input pin of the logic and power supply module. The logic and power supply circuit 11 includes an AND gate CD4081 and a power supply filter circuit. The output pin of the AND gate CD4081 is coupled to the input of the controller 12. The power supply filter circuit is connected to the power supply and outputs ±12V. The power supply filter circuit includes a DC / DC power supply module, and the input of the DC / DC power supply module is connected to the power supply.

[0042] During the cutting process, ultrasonic microphone 8 receives 20-80kHz ultrasonic pulses generated by debris splashing and outputs a signal. Preamplifier AD8421 amplifies the signal, followed by a high-pass filter to filter out low-frequency noise, and then a band-pass filter to further limit the frequency band and suppress high-frequency switching noise. A notch filter deeply attenuates vibration harmonics using a double-T network to eliminate residual interference. Envelope detector LF398 extracts the amplitude envelope of the ultrasonic pulse. When the envelope signal is between the upper and lower limits, window comparator LM393 outputs a high level to logic AND gate CD4081. During this process, vibration monitoring branch 9 also plays a role. The system is designed to protect the laser displacement sensor 5. A low-pass filter allows mechanical vibration signals below 15kHz to pass through while suppressing high-frequency ultrasonic components. An analog signal memory LF398 captures the vibration amplitude. When the vibration amplitude exceeds a preset threshold, a comparator LM311 outputs a high-level interference signal to indicate the presence of interference. This interference signal is inverted and input to an AND gate CD4081 to ensure that the main channel trigger is blocked when the vibration exceeds the limit. After the AND gate CD4081 responds, it outputs a high-level trigger signal to the controller 12. Only then can the controller 12 control the servo motor 7 to move the swing arm 6 and the protective cover 3, thereby protecting the laser displacement sensor 5 and preventing false triggering.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A laser displacement sensor automatic guard, characterized by, The utility model relates to a laser displacement sensor protection device, including lathe, and the vertical support (1) fixed connection in lathe through horizontal fixture (2), sensor fixture (4) fixed connection has laser displacement sensor (5) on the vertical support (1), the vertical support (1) fixed connection has rudder (7), the movable end fixed connection has swing arm (6) of rudder (7), swing arm (6) is detachably connected with the protective cover (3) of laser displacement sensor (5) can shelter.

2. A laser displacement sensor automatic protective cover according to claim 1, characterized in that, The controller (12) is coupled to the anti-interference main control circuit, which collects 20kHz-80kHz ultrasonic pulses generated by the flying debris and transmits signals to the controller (12) to control the rudder (7) to work.

3. A laser displacement sensor automatic guard according to claim 2, wherein, The anti-interference main control circuit includes an ultrasonic microphone (8), a vibration monitoring branch (9), an ultrasonic signal main channel module (10), and a logic and power supply circuit (11). The ultrasonic microphone (8) is arranged on the vertical support (1) and is used to collect 20kHz-80kHz ultrasonic pulses generated by the flying debris and output signals. The output end of the ultrasonic microphone (8) is coupled to the input end of the ultrasonic signal main channel module (10). The output end of the ultrasonic signal main channel module (10) is connected to the first input end of the logic and power supply module. The output end of the vibration monitoring branch (9) module is connected to the second input end of the logic and power supply module. The power supply output end of the logic and power supply module supplies power to the ultrasonic signal main channel module (10) and the vibration monitoring branch (9) module. The trigger output end of the logic and power supply module is connected to the input end of the controller (12).

4. A laser displacement sensor automatic guard according to claim 3, wherein, The ultrasonic signal main channel module (10) includes a preamplifier AD8421, a high-pass filter, a band-pass filter, a notch filter, an envelope detector LF398, and a window comparator LM393. The input end of the preamplifier AD8421 is coupled to the signal output pin of the ultrasonic microphone (8). The output pin of the preamplifier AD8421 is connected to the input pin of the high-pass filter. The output pin of the high-pass filter is connected to the input pin of the band-pass filter. The output pin of the band-pass filter is connected to the input pin of the notch filter. The output pin of the notch filter is connected to the input pin of the envelope detector. The output pin of the envelope detector LF398 is connected to the window comparator LM393. The output pin of the window comparator LM393 is connected to the input pin of the logic and power supply module.

5. A laser displacement sensor automatic guard according to claim 3, wherein, The vibration monitoring branch (9) comprises a low-pass filter, an analog signal memory LF398, and a comparator LM311, an input pin of the low-pass filter is coupled with a signal output pin of the ultrasonic microphone (8), an output pin of the low-pass filter is connected to an input pin of the analog signal memory LF398, an output pin of the analog signal memory LF398 is connected to a non-inverting input pin of the comparator LM311, and an output pin of the comparator LM311 is connected to an input pin of a logic and power module.

6. A laser displacement sensor automatic guard according to claim 3, wherein, The logic and power circuit (11) comprises a logic and gate CD4081 and a power filter circuit, an output pin of the logic and gate CD4081 is coupled with an input end of the controller (12), and the power filter circuit is connected with a power supply and outputs ±12V.

7. A laser displacement sensor automatic guard according to claim 6, wherein, The power filter circuit comprises a DC / DC power module, and an input end of the DC / DC power module is connected with a power supply.

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