An intelligent safety protection system for laser processing of non-metallic materials

Abstract

The application discloses an intelligent safety protection system for laser processing of nonmetallic materials, which comprises an IO analog quantity acquisition module, an intermediate relay A and an intermediate relay B. The IO analog quantity acquisition module is used for periodically receiving communication verification information sent by an upper computer and generating a first disconnect control instruction when the IO analog quantity acquisition module does not receive the communication verification information sent by the upper computer within a preset time. The intermediate relay A is used for receiving the first disconnect control instruction and immediately interrupting light emission of a laser. The intermediate relay B is used for receiving a second disconnect control instruction and immediately interrupting light emission of the laser. When the upper computer software is stuck, the temperature of a light spot exceeds a set temperature threshold, the smoke concentration of a processing site exceeds a set threshold, the red light-off time exceeds a set time threshold, the conveying speed of a material to be processed is lower than a set speed threshold or a manual emergency stop switch is turned off, the light emission of the laser is immediately cut off, and the safety protection effect of the laser processing of the nonmetallic materials is achieved.

Description

Technical Field

[0001] This invention relates to the field of laser processing, specifically to an intelligent safety protection system for laser processing of non-metallic materials. Background Technology

[0002] In the furniture industry, edge banding is used for wood surface coating. Currently, EVA and PUR are mainly used for bonding. Laser edge banding technology uses a device that can safely generate lasers to instantly activate the laser polymer functional layer of the edge banding, so that the edge banding is "riveted" together with the board particles. It can achieve a permanent and completely seamless bond in terms of both appearance and function. It is also wear-resistant, moisture-proof and heat-resistant.

[0003] Traditional edge banding uses laser to activate (melt) a functional layer containing a laser absorber. After passing through a pressure roller, the edge banding is adhered to the surface of the wood board to achieve the edge banding effect. However, during the application process, traditional laser edge banding may encounter serious problems such as open flames and thick smoke due to factors such as software jams or conveyor device malfunctions.

[0004] Similar safety risks exist in other non-metallic material laser processing scenarios. Therefore, it is necessary to design an intelligent safety protection system for non-metallic material laser processing. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by providing an intelligent safety protection system for laser processing of non-metallic materials, thereby solving at least one of the aforementioned technical problems.

[0006] Based on one aspect of this invention, an intelligent safety protection system for laser processing of non-metallic materials is provided, comprising:

[0007] IO analog signal acquisition module: The IO analog signal acquisition module is used to periodically receive communication verification information sent by the host computer. When the IO analog signal acquisition module does not receive communication verification information sent by the host computer within a preset time, it generates a first disconnection control command. The IO analog signal acquisition module is also used to acquire signals from encoders, temperature sensors, smoke sensors, emergency stop switches, etc. When the signal exceeds the set threshold or is abnormal, it generates a second disconnection control command.

[0008] Host computer: The host computer is used to communicate with the IO analog signal acquisition module and to communicate with the laser control card to control the laser; the host computer periodically receives communication verification information sent by the laser control card. When the host computer does not receive communication verification information sent by the laser control card within a preset time, the host computer sends an instruction to the IO analog signal acquisition module, and the IO analog signal acquisition module generates a first disconnection control instruction.

[0009] Intermediate relay A: The intermediate relay A is used to receive the first disconnect control command and immediately interrupt the laser output. The intermediate relay A includes a coil A and a normally closed contact A. The two pins of the normally closed contact A are respectively connected to the laser output interlock channel A and channel B. One pin of the coil A is connected to the output terminal D01+ of the IO analog signal acquisition module.

[0010] Intermediate relay B: The intermediate relay B is used to receive the second disconnect control command and immediately interrupt the laser's emission. The intermediate relay B includes a coil B and a normally closed contact B. The two pins of the normally closed contact B are connected in series between the normally closed contact A and the laser's output interlock channel B. One pin of the coil B is connected to the output terminal D02+ of the IO analog signal acquisition module.

[0011] The laser processing system includes a laser, a host computer, and a laser control card. The host computer contains control software that generates control commands and sends them to the laser control card. The laser control card controls the operation of the laser according to the received control commands. When the software in the host computer freezes, the operation of the laser will become uncontrollable, thus causing safety risks.

[0012] In the above technical solution, a communication is established between the IO analog signal acquisition module and the host computer. The host computer sends communication verification information to the IO analog signal acquisition module periodically. If the IO analog signal acquisition module can receive the communication verification information on time, it indicates that the host computer software has not frozen. If the IO analog signal acquisition module fails to receive the communication verification information within a preset time, it indicates that the host computer software has frozen. At this time, the IO analog signal acquisition module generates a first disconnection control command and sends it to the intermediate relay A. The normally closed contact A opens, thereby disconnecting the laser light output interlock channel A and channel B, and the laser stops emitting light, thus preventing safety risks.

[0013] Furthermore, the intelligent safety protection system also includes an encoder, which is used to acquire the conveying speed of the material to be processed and send the conveying speed to the host computer through the IO analog quantity acquisition module;

[0014] The host computer is also used to control the IO analog signal acquisition module to generate a second disconnection control command when the transmission speed is lower than the speed threshold.

[0015] Furthermore, the intelligent safety protection system also includes a temperature sensor, which is used to acquire temperature data at the point of light fall and transmit the temperature data to the host computer through an IO analog signal acquisition module.

[0016] The host computer is also used to control the IO analog quantity acquisition module to generate a second disconnection control command when the temperature data reaches or exceeds the material ignition temperature threshold.

[0017] Furthermore, when the temperature data does not reach the material ignition temperature threshold, the host computer is also used to obtain the optimal processing temperature of the material to be processed, and generate an output power control command based on the optimal processing temperature and send it to the laser control card. The laser control card is used to control the output power of the laser based on the output power control command.

[0018] Furthermore, the intelligent safety protection system also includes a smoke sensor, which is used to acquire smoke concentration data at the processing site and transmit the smoke concentration data to the host computer through an IO analog signal acquisition module;

[0019] The host computer is also used to control the IO analog quantity acquisition module to generate a second disconnection control command when the smoke concentration data reaches or exceeds the smoke concentration threshold.

[0020] Furthermore, the intelligent safety protection system also includes a manual emergency stop switch, which is a normally closed switch and is connected to the IO analog signal acquisition module; the IO analog signal acquisition module is also used to control the IO analog signal acquisition module to generate a second disconnection control command when the disconnection signal of the manual emergency stop switch is obtained.

[0021] Furthermore, the red light of the laser is turned off when it emits light, and the laser is turned off when the red light is turned on. The host computer is also used to acquire the red light off time of the laser, and control the IO analog signal acquisition module to generate a second disconnection control command when the red light off time exceeds the off time threshold.

[0022] Furthermore, it also includes: acquiring the conveying speed, temperature data, and smoke concentration data; when the conveying speed is lower than the speed threshold, the temperature data reaches or exceeds the material ignition temperature threshold, and the smoke concentration data reaches or exceeds the smoke concentration threshold, the host computer controls the IO analog quantity acquisition module to generate a second disconnection control command to control the normally closed contact B to disconnect.

[0023] Furthermore, it also includes obtaining the optimal processing temperature of the material to be processed when the temperature data does not reach the material ignition temperature threshold, and controlling the laser output power through the laser control card.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] (1) The present invention provides an intelligent safety protection system for laser processing of non-metallic materials. By establishing a communication between the IO analog quantity acquisition module and the host computer, the host computer sends communication verification information to the IO analog quantity acquisition module periodically. If the IO analog quantity acquisition module can receive the communication verification information on time, it indicates that the software of the host computer has not been stuck. When the IO analog quantity acquisition module fails to receive the communication verification information within a preset time, it indicates that the software of the host computer has been stuck. At this time, the IO analog quantity acquisition module generates a first disconnection control command and sends it to the intermediate relay A. The normally closed contact A is opened, thereby disconnecting the laser output interlock channel A and channel B, and the laser stops outputting light, thereby preventing safety risks.

[0026] (2) The present invention provides an intelligent safety protection system for laser processing of non-metallic materials. By monitoring the temperature of the light drop point, the smoke concentration at the processing site, the red light off time, the conveyor belt speed, and the status of the manual emergency stop switch, a second disconnection control signal is generated when any of the above parameters is abnormal, which controls the normally closed contact B of the intermediate relay B to open, thereby cutting off the laser output and achieving safety protection for laser processing.

[0027] (3) The present invention provides an intelligent safety protection method for laser processing of non-metallic materials. By judging whether the communication between the IO analog quantity acquisition module and the host computer is abnormal, judging whether the host computer is stuck in software and whether the laser control card is disconnected, the normally closed contact A of the intermediate relay A is triggered to open when the software is stuck or the laser control card is disconnected, thereby realizing the safety protection of laser processing. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the system structure according to an embodiment of the present invention;

[0029] Figure 2 This is a circuit diagram of an intermediate relay according to an embodiment of the present invention;

[0030] Figure 3 This is a flowchart of a method according to an embodiment of the present invention. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely 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.

[0032] like Figure 1As shown, this embodiment provides an intelligent safety protection system for laser processing of non-metallic materials, which is applied to non-metallic laser processing scenarios. In the laser processing scenario, the processing equipment includes a material conveyor belt and a laser device. The laser device includes a laser, a laser control card, and a host computer. The host computer has built-in software and is connected to the laser control card. The host computer controls the working status of the laser by sending control commands to the laser control card.

[0033] The intelligent safety protection system includes an IO analog signal acquisition module connected to a host computer. One output terminal DO1+ of the IO analog signal acquisition module is connected to an intermediate relay A. The intermediate relay A includes a coil A, a normally open contact (not connected to the circuit in this embodiment), and a normally closed contact A.

[0034] Another output terminal DO2+ of the IO analog signal acquisition module is connected to an intermediate relay B. The intermediate relay B includes a coil B, a normally open contact (not connected to the circuit in this embodiment), and a normally closed contact B.

[0035] like Figure 2 As shown, specifically, one pin of coil A is connected to the output terminal DO1+ of the IO analog signal acquisition module, and the other pin of coil A is connected to the 0V terminal of the switching power supply of the safety protection system. One pin of coil B is connected to the output terminal DO2+ of the IO analog signal acquisition module, and the other pin of coil B is connected to the 0V terminal of the switching power supply of the safety protection system.

[0036] One pin of normally closed contact A is connected to laser output interlock channel A, and the other pin is connected to the pin of normally closed contact B. The pin of normally closed contact B furthest from normally closed contact A is connected to laser output interlock channel B.

[0037] A communication line is established between the host computer and the IO analog signal acquisition module to verify whether the communication is abnormal. The host computer periodically sends communication verification information to the IO analog signal acquisition module through this communication line. For example, the host computer sends an analog signal to the IO analog signal acquisition module every second. If the IO analog signal acquisition module fails to receive the communication verification information at the preset time, it indicates that the host computer has experienced a software freeze and failed to send the communication verification information on time. It also indicates that the software on the host computer may be unable to generate control signals to send to the laser control card. At this time, the laser is in an uncontrolled state, posing a safety risk.

[0038] When the IO analog signal acquisition module fails to receive the communication verification information within the preset time, the IO analog signal acquisition module generates the first disconnection control command and sends it to the intermediate relay A. The normally closed contact A opens, thereby disconnecting the laser output interlock channel A and channel B, and the laser stops emitting light.

[0039] The safety protection system provided in this embodiment also includes an encoder, which is set on the transmission shaft of the conveyor belt for the material to be processed. The encoder is used to obtain the conveying speed of the material to be processed and send the conveying speed to the host computer through the IO analog quantity acquisition module.

[0040] The host computer is also used to control the IO analog quantity acquisition module to generate a second disconnection control command when the transmission speed is lower than the speed threshold. The second disconnection control command is sent to the coil B of the intermediate relay B, thereby disconnecting the normally closed bottom contact B. At this time, the circuit between the laser output interlock channel A and channel B is disconnected, and the laser stops emitting light.

[0041] The safety protection system provided in this embodiment also includes a temperature sensor, which is used to acquire the temperature data (analog quantity) of the light-falling point (here, the light-falling point refers to the point to be heated) and transmit the temperature data (digital quantity) to the host computer through the IO analog quantity acquisition module (which converts the analog quantity of the temperature data into a digital quantity).

[0042] The host computer is also used to control the IO analog quantity acquisition module to generate a second disconnection control command when the temperature data reaches or exceeds the material ignition temperature threshold. The second disconnection control command is sent to the coil B of the intermediate relay B, thereby disconnecting the normally closed contact B. At this time, the circuit between the laser light output interlock channel A and channel B is disconnected, and the laser stops emitting light.

[0043] In this embodiment, when the temperature data does not reach the material ignition temperature threshold, the host computer is further configured to obtain the optimal processing temperature of the material to be processed, and generate an output power control command based on the optimal processing temperature, which is then sent to the laser control card. The laser control card controls the laser output power according to the output power control command. By controlling the laser output power, the temperature at the point of light fall is made equal to the optimal processing temperature of the material to be processed, thereby improving the processing quality.

[0044] The safety protection system provided in this embodiment also includes a smoke sensor. The smoke sensor is located near the spot directly above the light source. The smoke sensor is used to acquire smoke concentration data at the processing site and transmits the smoke concentration data to the host computer through the IO analog signal acquisition module. The smoke sensor uses the principle that the resistance of the smoke-sensitive element changes due to the concentration of smoke (mainly combustible particles) to send an analog signal corresponding to the smoke concentration to the IO analog signal acquisition module. The IO analog signal acquisition module converts the received analog signal corresponding to the smoke concentration into a digital signal and sends it to the host computer.

[0045] The host computer is also used to control the IO analog quantity acquisition module to generate a second disconnection control command when the smoke concentration data reaches or exceeds the smoke concentration threshold. The second disconnection control command is sent to the coil B of the intermediate relay B, thereby disconnecting the normally closed contact B. At this time, the circuit between the laser output interlock channel A and channel B is disconnected, and the laser stops emitting light.

[0046] When the laser spot does not fall on the point to be heated, the temperature sensed by the temperature sensor will not exceed the ignition temperature threshold. At this time, it is impossible to cut off the laser output by judging the abnormal temperature data. Therefore, a smoke sensor is set up in addition to cut off the laser output in time when the laser emitted by the laser causes other points to burn, so as to prevent the safety accident from developing further.

[0047] The safety protection system provided in this embodiment also includes a manual emergency stop switch, which is a normally closed switch connected to an IO analog signal acquisition module. The IO analog signal acquisition module is also used to control the generation of a second disconnection control command when a disconnection signal from the manual emergency stop switch is received. When personnel at the processing site discover other safety hazards, they can actively disconnect the manual emergency stop switch, generating a disconnection signal. This disconnection signal is transmitted to the host computer, which controls the IO analog signal acquisition module to generate a second disconnection control command and send it to coil B, thereby disconnecting the normally closed contact B. At this time, the circuit between the laser emission interlock channel A and channel B is disconnected, and the laser stops emitting light.

[0048] In this embodiment, the host computer is also used to acquire the red light off time of the laser, and control the IO analog signal acquisition module to generate a second disconnect control command when the red light off time exceeds the off time threshold. The red light off time of the laser represents the duration of laser emission. When the laser emission time exceeds a certain threshold, it indicates that the laser emission time is too long. At this time, the IO analog signal acquisition module generates a second disconnect control command to control the normally closed contact B to open. At this time, the circuit between the laser emission interlock channel A and channel B is disconnected, and the laser stops emitting light.

[0049] The safety protection system provided in this embodiment monitors the upper computer software jamming, light drop temperature, smoke concentration, material conveying speed, and laser emission time during the laser processing of non-metallic materials. When any parameter is abnormal, the normally closed contact of the intermediate relay is opened, thereby cutting off the laser emission and comprehensively preventing the occurrence of safety hazards.

[0050] In a preferred embodiment, when any of the parameters such as the light-falling point temperature, smoke concentration, material conveying speed, and laser emission time are abnormal, the host computer generates a stop emission command and sends the stop emission command to the laser control card, which then controls the laser to stop emission.

[0051] By disconnecting the normally closed contacts of the intermediate relay and stopping the laser from emitting light, dual cutoff protection is achieved, thereby further enhancing the effectiveness of safety protection.

[0052] like Figure 3 As shown, the implementation method of the intelligent safety protection system for laser processing of non-metallic materials includes the following steps:

[0053] Determine if the host computer has experienced a software freeze. If so, the IO analog signal acquisition module generates the first disconnection control command and sends it to intermediate relay A. Intermediate relay A disconnects the normally closed contact A.

[0054] The method for determining whether the host computer has experienced a software freeze is as follows: if the IO analog signal acquisition module does not receive the communication verification information sent by the host computer within a preset period, it indicates that the host computer has experienced a software freeze.

[0055] In a preferred embodiment, the method further includes: acquiring the conveying speed, temperature data, smoke concentration data, laser red light off time, and the action of the manual emergency stop switch; when the conveying speed exceeds a speed threshold, the temperature data reaches or exceeds a material ignition temperature threshold, the smoke concentration data reaches or exceeds a smoke concentration threshold, or the laser red light off time exceeds an off time threshold, the above parameters are considered abnormal, and the host computer controls the IO analog signal acquisition module to generate a second disconnection control command to control the normally closed contact B to open. When the manual emergency stop switch is activated (i.e., a disconnection signal is generated), the host computer controls the IO analog signal acquisition module to generate a second disconnection control command to control the normally closed contact B to open.

[0056] In a preferred embodiment, the method further includes obtaining the optimal processing temperature of the material to be processed when the temperature data does not reach the material ignition temperature threshold, and controlling the laser output power through a laser control card.

[0057] In a preferred embodiment, when any of the parameters such as the light-falling point temperature, smoke concentration, material conveying speed, and laser emission time becomes abnormal, a stop emission command is generated by the host computer and sent to the laser control card, which then controls the laser to stop emission.

[0058] 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 intelligent safety protection system for laser processing of non-metallic materials, characterized in that, include: IO analog signal acquisition module: The IO analog signal acquisition module is used to periodically receive communication verification information sent by the host computer. When the IO analog signal acquisition module does not receive communication verification information sent by the host computer within a preset time, it generates a first disconnection control command. The IO analog signal acquisition module is also used to acquire signals from the encoder, temperature sensor, smoke sensor, and emergency stop switch. When the signal exceeds the set threshold or is abnormal, it generates a second disconnection control command. Host computer: The host computer is used to communicate with the IO analog signal acquisition module and to communicate with the laser control card to control the laser; Intermediate relay A: The intermediate relay A is used to receive the first disconnect control command and immediately interrupt the laser output. The intermediate relay A includes a coil A and a normally closed contact A. The two pins of the normally closed contact A are respectively connected to the laser output interlock channel A and channel B. One pin of the coil A is connected to the output terminal D01+ of the IO analog signal acquisition module. Intermediate relay B: The intermediate relay B is used to receive the second disconnect control command and immediately interrupt the laser's emission. The intermediate relay B includes a coil B and a normally closed contact B. The two pins of the normally closed contact B are connected in series between the normally closed contact A and the laser's output interlock channel B. One pin of the coil B is connected to the output terminal D02+ of the IO analog signal acquisition module.

2. The intelligent safety protection system for laser processing of non-metallic materials according to claim 1, characterized in that, The intelligent safety protection system also includes an encoder, which is used to obtain the conveying speed of the material to be processed and send the conveying speed to the host computer through the IO analog quantity acquisition module; The host computer is also used to control the IO analog signal acquisition module to generate a second disconnection control command when the transmission speed is lower than the speed threshold.

3. The intelligent safety protection system for laser processing of non-metallic materials according to claim 1, characterized in that, The intelligent safety protection system also includes a temperature sensor, which is used to acquire temperature data at the point of light fall and transmit the temperature data to the host computer through the IO analog quantity acquisition module. The host computer is also used to control the IO analog quantity acquisition module to generate a second disconnection control command when the temperature data reaches or exceeds the material ignition temperature threshold.

4. The intelligent safety protection system for laser processing of non-metallic materials according to claim 1, characterized in that, When the temperature data does not reach the material ignition temperature threshold, the host computer is also used to obtain the optimal processing temperature of the material to be processed, and generate an output power control command based on the optimal processing temperature and send it to the laser control card. The laser control card is used to control the output power of the laser based on the output power control command.

5. The intelligent safety protection system for laser processing of non-metallic materials according to claim 1, characterized in that, The intelligent safety protection system also includes a smoke sensor, which is used to acquire smoke concentration data at the processing site and transmit the smoke concentration data to the host computer through an IO analog quantity acquisition module; The host computer is also used to control the IO analog quantity acquisition module to generate a second disconnection control command when the smoke concentration data reaches or exceeds the smoke concentration threshold.

6. The intelligent safety protection system for laser processing of non-metallic materials according to claim 1, characterized in that, The intelligent safety protection system also includes a manual emergency stop switch, which is a normally closed switch and is connected to an IO analog signal acquisition module. The IO analog signal acquisition module is also used to generate a second disconnection control command when it receives a disconnection signal from the manual emergency stop switch.

7. The intelligent safety protection system for laser processing of non-metallic materials according to claim 1, characterized in that, The laser will turn off the red light when it emits light, and turn off the laser when the red light is turned on. The host computer is also used to obtain the red light off time of the laser, and control the IO analog quantity acquisition module to generate a second disconnection control command when the red light off time exceeds the off time threshold.

8. The intelligent safety protection system for laser processing of non-metallic materials according to claim 1, characterized in that, Also includes: The system acquires conveying speed, temperature data, and smoke concentration data. When the conveying speed is lower than the speed threshold, the temperature data reaches or exceeds the material ignition temperature threshold, or the smoke concentration data reaches or exceeds the smoke concentration threshold, the host computer controls the IO analog quantity acquisition module to generate a second disconnection control command to control the normally closed contact B to disconnect.

9. The intelligent safety protection system for laser processing of non-metallic materials according to claim 1, characterized in that, It also includes obtaining the optimal processing temperature of the material to be processed when the temperature data does not reach the material ignition temperature threshold, and controlling the laser output power through the laser control card.

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