CN-122007670-A - Laser cutting mechanical arm capable of reducing temperature

Abstract

The invention discloses a mechanical arm capable of cooling for laser cutting, which belongs to the technical field of mechanical arms and comprises a mechanical arm body, a vibration detection unit, a control unit and a cooling liquid conveying unit, wherein the vibration detection unit is arranged on the mechanical arm body and comprises a piezoelectric type electric control vibration sensor which is electrically connected with the control unit, and the control unit is used for receiving an output value of the vibration detection unit and regulating and controlling the quantity of cooling liquid output by the cooling liquid conveying unit, so that the quantity of the cooling liquid required by the mechanical arm during laser cutting operation is dynamically regulated, the dynamic self-adaptive regulation of the quantity of the cooling liquid output is realized, the cooling intensity is regulated in real time according to vibration change in the cutting process, the problem that a traditional fixed cooling mode is not matched with actual cooling requirements is effectively solved, and the core component is prevented from being damaged due to insufficient cooling and overheating.

Inventors

• GAO MAOYUAN
• HUANG QINGHAI

Assignees

• 江苏耀威新材料科技有限公司

Dates

Publication Date

20260512

Application Date

20260410

Claims (10)

1. 1. The mechanical arm for laser cutting capable of reducing temperature is characterized by comprising a mechanical arm body, a vibration detection unit, a control unit and a cooling liquid conveying unit; The vibration detection unit is arranged on the mechanical arm body and comprises a piezoelectric type electric control vibration sensor, and the piezoelectric type electric control vibration sensor is electrically connected with the control unit; The control unit is used for receiving the output value of the vibration detection unit and regulating and controlling the quantity of the output cooling liquid of the cooling liquid conveying unit, so as to dynamically regulate the quantity of the cooling liquid required by the mechanical arm during the laser cutting operation; Comprising the following steps: The vibration calculation module receives the vibration amplitude output by the vibration detection unit and calculates the vibration change rate; The vibration regulation and control module calculates the power output quantity of the cooling liquid conveying driving assembly according to the vibration change rate and transmits the power output quantity to the cooling conveying unit through the controller; the cooling liquid conveying unit comprises a variable-frequency water pump and an electric actuator for regulating and controlling a switch of the variable-frequency water pump, wherein the electric actuator receives a controller signal and adjusts the opening amount of the variable-frequency water pump, so as to control the output quantity of cooling liquid and realize dynamic adjustment of the cooling liquid.
2. 2. The mechanical arm for laser cutting capable of reducing temperature according to claim 1, wherein the vibration detection unit detects a vibration signal of a core vibration area of the mechanical arm through a piezoelectric type electric control vibration sensor, and the core vibration area is a joint of a laser shell and a laser cutting head lens barrel; The piezoelectric type electric control vibration sensor adopts a rigid attaching and fixing mode, the installation position of the piezoelectric type electric control vibration sensor is adjacent to the installation shell of the cooling and cooling circulating assembly, and mechanical vibration signals can be converted into electric control signals and output to the control unit.
3. 3. The mechanical arm for laser cutting capable of reducing temperature according to claim 2, wherein the piezoelectric type electric control vibration sensor is arranged in a core vibration area of the mechanical arm body and is used for collecting vibration signals in the laser cutting operation process in real time, and the detection response of the sensor is adapted to the dynamic working condition of laser cutting.
4. 4. The mechanical arm for laser cutting capable of reducing temperature according to claim 3, wherein the control unit uses a main controller as a core carrier, and an interference signal filtering module is arranged in the main controller and is used for filtering irrelevant vibration interference generated in the operation process of the mechanical arm and ensuring the accuracy of a vibration detection signal and a subsequent regulation instruction.
5. 5. The mechanical arm for laser cutting capable of reducing temperature according to claim 4, wherein the vibration calculation module is integrated in the main controller, and the vibration calculation module establishes a signal transmission relation with the piezoelectric type electric control vibration sensor and is used for receiving a vibration detection signal, calculating a vibration change rate in real time after signal conversion, amplitude operation and data buffering, and outputting the vibration change rate to the vibration regulation and control module.
6. 6. The mechanical arm for laser cutting capable of reducing temperature according to claim 5, wherein the vibration control module is integrated in the main controller, and respectively establishes a signal transmission relation with the vibration calculation module and the electric actuator, and is used for receiving the vibration change rate parameter, calculating the power output parameter of the cooling liquid conveying driving assembly by combining with a preset quantitative control logic, and converting the power output parameter into a control instruction to be transmitted to the electric actuator.
7. 7. The mechanical arm for laser cutting capable of reducing temperature according to claim 6, wherein the vibration calculation module calculates real-time vibration amplitude according to an electric control signal output by the piezoelectric type electric control vibration sensor, calculates vibration change rate in unit time based on a plurality of groups of continuously collected vibration amplitude data, and outputs the vibration change rate.
8. 8. The laser cutting mechanical arm capable of reducing temperature according to claim 7, wherein the vibration control module presets a vibration change rate threshold interval, classifies and judges the received vibration change rate parameters, calculates corresponding variable-frequency water pump opening amount and rotation speed parameters according to the judging result, generates a control instruction and transmits the control instruction to the electric actuator.
9. 9. The mechanical arm for laser cutting capable of reducing temperature according to claim 8, wherein the vibration control module dynamically corrects the operation parameters of the variable frequency water pump according to the adjusted circulation state of the cooling liquid and the real-time vibration change rate fed back by the vibration calculation module; When the vibration change rate exceeds the preset interval, the power output parameter is recalculated and adjusted to form closed-loop regulation and control.
10. 10. The mechanical arm for laser cutting capable of reducing temperature according to claim 9, wherein the cooling liquid conveying unit comprises a power component, a liquid storage component, a transmission flow channel component and a heat exchange component, the power component is a variable-frequency water pump, the liquid storage component is a water tank, the transmission flow channel component comprises a water inlet transmission pipe, a water return transmission pipe, a water inlet pipe and a water return pipe, and the heat exchange component comprises a spiral annular water cooling flow channel, a cooling cavity and a lens seat; The variable-frequency water pump is connected with the water tank, the transmission flow channel assembly is used for realizing the communication of the power assembly, the liquid storage assembly and the heat exchange assembly, and the electric actuator is used for adjusting the operation parameters of the variable-frequency water pump after receiving the control instruction, so that the dynamic adjustment of the circulation speed of the cooling liquid is realized.

Description

Laser cutting mechanical arm capable of reducing temperature Technical Field The invention relates to the field of mechanical arms, in particular to a mechanical arm capable of cooling for laser cutting. Background The laser cutting technology is widely applied to the field of machining by virtue of the advantages of high precision and high efficiency, and the mechanical arm for laser cutting is used as a core execution component, so that the operation stability of the mechanical arm directly influences the cutting quality. In the laser cutting process, the laser and the laser cutting head can generate continuous vibration, the vibration intensity is dynamically changed along with the cutting working condition, and meanwhile, the core heating component can continuously accumulate heat, and if the heat cannot be timely dissipated, the running stability and the service life of the equipment can be influenced. The existing cooling system of the mechanical arm for laser cutting mostly adopts a fixed mode to regulate and control the output quantity of cooling liquid, lacks dynamic adaptation capability to vibration working conditions, and is difficult to adjust the cooling intensity in real time according to vibration changes in the cutting process. In addition, the redundancy of the partial cooling system structure depends on the cooperative regulation and control of multiple components, so that the risk of equipment failure is increased, the problem that the output quantity of cooling liquid is not matched with the actual cooling requirement exists, and the core component is easy to damage due to insufficient cooling and overheating or energy consumption waste due to excessive cooling is caused. It is worth noting that the temperature sensor commonly used in the traditional dynamic cooling scheme has the remarkable limitations that natural hysteresis exists in temperature signal conduction and detection, instantaneous heat load change caused by working condition mutation (such as material cutting and cutting path changing) in the laser cutting process cannot be responded in time, the condition of 'untimely' or 'overcooling' is easy to occur, and meanwhile, high temperature and dust in the laser cutting environment easily influence the detection precision of the temperature sensor. The vibration signal in the laser cutting process is directly related to the cutting load and the heat input intensity, the change of the vibration intensity can reflect the dynamic change of the cutting working condition in real time, the response speed is far faster than that of the temperature signal, and the vibration sensor has strong anti-interference capability and flexible installation and is more suitable for the complex working condition of laser cutting. Disclosure of Invention The invention aims to provide a mechanical arm for laser cutting capable of reducing temperature so as to solve the problems in the background technology. In order to achieve the aim, the invention provides the following technical scheme that the mechanical arm comprises a mechanical arm body, a vibration detection unit, a control unit and a cooling liquid conveying unit; The vibration detection unit is arranged on the mechanical arm body and comprises a piezoelectric type electric control vibration sensor, and the piezoelectric type electric control vibration sensor is electrically connected with the control unit; The control unit is used for receiving the output value of the vibration detection unit and regulating and controlling the quantity of the output cooling liquid of the cooling liquid conveying unit, so as to dynamically regulate the quantity of the cooling liquid required by the mechanical arm during the laser cutting operation; Comprising the following steps: The vibration calculation module receives the vibration amplitude output by the vibration detection unit and calculates the vibration change rate; The vibration regulation and control module calculates the power output quantity of the cooling liquid conveying driving assembly according to the vibration change rate and transmits the power output quantity to the cooling conveying unit through the controller; The cooling liquid conveying unit comprises a variable-frequency water pump and an electric actuator for regulating and controlling a switch of the variable-frequency water pump, wherein the electric actuator receives a controller signal and adjusts the opening amount of the variable-frequency water pump so as to control the output quantity of cooling liquid and realize dynamic adjustment of the cooling liquid; The vibration detection unit detects a vibration signal of a core vibration area of the mechanical arm through a piezoelectric type electric control vibration sensor, wherein the core vibration area is a joint of the laser shell and the laser cutting head lens barrel; The piezoelectric type electric control vibration sensor adopts a rigid attaching and fixing mode, and the