Horizontal machining center whole machine protective cover and control method thereof

Abstract

A whole machine protective cover for a horizontal machining center and a control method thereof, comprising a whole machine protective cover body, a processing area safety door is arranged at the inner front position of the whole machine protective cover body, the processing area safety door is controlled by a processing area safety door driving cylinder, a safety light curtain is arranged on the outside of the whole machine protective cover body, the safety light curtain is used to detect the situation within the travel range of the processing area safety door, an operating area safety door is arranged on the right side of the whole machine protective cover body, and a processing area air purification device 3 and a processing area self-cleaning function and a workpiece on-machine cleaning device are arranged on the top of the whole machine protective cover body. The present invention has the advantages of changing the traditional mode of independent control of each sub-function to perform system integrated control, using the NC-PLC interactive control method to comprehensively improve the usability and safety of the machining center, and has the characteristics of simple structure and meeting the requirements of unmanned operation.

Description

Technical Field

[0001] The invention relates to the technical field of intelligent control of horizontal machining centers and flexible manufacturing system assembly line machine tools, and in particular to a whole machine protective cover of a horizontal machining center and a control method thereof. Background Art

[0002] At present, most of the protective covers configured for horizontal machining centers have single functions and are independently controlled, failing to achieve system integration and coordinated control. For example, the traditional automatic safety door control in the processing area only controls the opening and closing of the door and performs detection. There is no configuration to use a safety light curtain to perform safety detection during the operation process, and there is no double safety detection protection between the PLC program and the NC processing program, and there is a safety hazard if there is no processing program start-up lock. The traditional operating area safety door control only detects the status of the operating area safety door without controlling it, and there is no integrated interlocking control with the chip conveyor.

[0003] Traditional whole machine protective covers are not equipped with self-cleaning functions for the processing area and on-machine cleaning of workpieces, and cannot meet the intelligent unattended production requirements of flexible manufacturing systems. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a horizontal machining center whole machine protective cover and a control method thereof, which has the characteristics of changing the traditional mode of independent control of each sub-function to system integrated control, using NC-PLC interactive control method to comprehensively improve the usability and safety of the machining center, and has a simple structure and meets the characteristics of unmanned operation.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The whole machine protective cover of the horizontal machining center includes a whole machine protective cover body 9, a processing area safety door 2 is arranged on the inner front side of the whole machine protective cover body 9, and the processing area safety door 2 is controlled by the processing area safety door driving cylinder 4. A safety light curtain 1 is arranged on the outer side of the whole machine protective cover body 9, and the safety light curtain 1 is used to detect the situation within the travel range of the processing area safety door 2. An operating area safety door 6 is arranged on the right side of the whole machine protective cover body 9, and a processing area air purification device 3 and a processing area self-cleaning function and a workpiece on-machine cleaning device 5 are arranged on the top of the whole machine protective cover body 9.

[0007] The operation area safety door 6 is provided with an operation area safety door observation port 8 .

[0008] The processing area air purification device 3 includes a processing area air purification device filter 10. The processing area air purification device filter 10 is an "L"-shaped structure, and the vertical end is close to the inner side of the whole machine protective cover body 9. A processing area air purification device exhaust port 11 for extracting water-containing gas from the internal space of the whole machine protective cover body 9 is passed through the vertical end of the processing area air purification device filter 10. A processing area air purification device drain port 12 is provided at the horizontal end of the processing area air purification device filter 10 and away from the whole machine protective cover body 9. The processing area air purification device filter 10 is used to convert the air extracted by the processing area air purification device exhaust port 11 into water and discharge it through the processing area air purification device drain port 12.

[0009] The processing area self-cleaning function and the workpiece on-machine cleaning device 5 include horizontally symmetrical mounting brackets 14, through which a diversion water pipe 15 is arranged, and a water inlet 13 is arranged on one side of the diversion water pipe 15. A plurality of spray ports 16 are opened below the diversion water pipe 15, and the spray ports 16 are used to spray water to various positions inside the protective cover of the entire machine.

[0010] The processing area safety door driving cylinder 4 is provided with an air circuit solenoid valve, and the processing area air purification device 3 and the processing area self-cleaning function and workpiece on-machine cleaning device 5 are provided with a water circuit solenoid valve, and the air circuit solenoid valve and the water circuit solenoid valve are controlled by an NC controller.

[0011] The whole machine protective cover body 9 is controlled by an NC controller, an electronic lock is arranged on the upper right corner of the operating area safety door 6, a chip conveyor is arranged inside the whole machine protective cover body 9, and the electronic lock and the chip conveyor are controlled by an NC controller.

[0012] A control method for a whole machine protective cover of a horizontal machining center comprises the following steps;

[0013] After the NC controller receives the processing area safety door closing command issued by the NC program, it transmits the command to the PLC through the NC command data area. The PLC makes judgments and controls through the PLC program, and transmits the command through the PROFIBUS bus distributed I / O interface module. The distributed I / O interface module transmits the command again to the distributed I / O digital output module 1 and the distributed I / O digital output module 2, converts the control command into an output 24V voltage control signal, and controls the processing area safety door 2 to open through the processing area safety door drive cylinder 4. The two air supply solenoid valves act at the same time to meet the simultaneous opening of the processing area safety door 2, forming Synchronous action, output pressure air to the processing area safety door driving cylinder 4, and finally control the processing area safety door 2 to complete the closing of the processing area safety door; at the same time, the processing area safety door opening detection switch 1 and the processing area safety door opening detection switch 2 detect the safety door position status, and transmit the detection status to the distributed I / O input module 1 and the distributed I / O input module 2, and encode the signal into PROFIBUS bus data through the distributed I / O interface module and transmit it to the PLC. The PLC program performs real-time detection and judgment and transmits this detection signal to the NC-PLC data interaction area for real-time double detection of the NC program;

[0014] After receiving the instruction to open the operating area safety door, the PLC performs judgment and control through the PLC program. When the conditions are met, the instruction is transmitted to the S7-300 PLC interface module through the PROFIBUS bus. The S7-300 PLC interface module transmits the instruction to the S7-300 PLC digital output module 1 again, converts the control instruction into an output 24V voltage control signal, and controls the opening and closing of the operating area safety door 6, and the electromagnetic coil of the electronic lock of the operating area safety door is turned on to release the locked state. At the same time, the state signal is encoded into PROFIBUS bus data through the distributed I / O interface module through the S7-300PLC digital input module 1, and transmitted to the PLC for real-time detection and judgment by the PLC program;

[0015] After receiving the start instruction of the processing area self-cleaning function and the workpiece on-machine cleaning device 5 on-machine cleaning function from the NC program, the NC controller transmits the instruction to the PLC through the NC instruction data area. The PLC makes judgment and control through the PLC program, and transmits the instruction to the S7-300 PLC interface module through the PROFIBUS bus. The S7-300 PLC interface module transmits the instruction to the S7-300 PLC digital output module again, converts the control instruction into an output 24V voltage control signal, and controls the processing area self-cleaning function and the workpiece on-machine cleaning device 5 on-machine cleaning function. The water supply solenoid valve is turned on, and pressure clean water is output to the processing area self-cleaning function and the workpiece on-machine cleaning device 5, and finally the processing area self-cleaning and workpiece on-machine cleaning are completed.

[0016] After receiving the start-up instruction of the processing area air purification device issued by the NC program, the NC controller transmits the instruction to the PLC through the NC instruction data area. The PLC makes judgment and control through the PLC program, and transmits the instruction to the S7-300 PLC interface module through the PROFIBUS bus. The S7-300 PLC interface module transmits the instruction to the S7-300 PLC digital output module again, converts the control instruction into an output control signal, controls the processing area air purification device 3, and completes the processing area air purification.

[0017] Beneficial effects of the present invention:

[0018] The present application configures the automatic safety door control of the processing area with a safety light curtain to perform safety detection during the operation process. Once a foreign object is detected entering the detection range during the operation, the PLC program will control the automatic safety door of the processing area to cut off the operation. At the same time, the NC processing program will issue an alarm to block the NC program from continuing to execute. The PLC program control prohibits the NC program from being started again to prevent human error. The NC program can only be executed again after the machine tool reset command is executed, which greatly improves the safety of the automatic safety door control of the processing area and forms a real-time linkage interlocking control with the PLC and NC.

[0019] Equipped with an electronic lock, the safety door of the operating area can be opened only when manual operation is performed. When the safety door of the operating area is open, the PLC program prohibits the NC program from starting and executing to prevent safety hazards caused by misoperation and malfunction. At the same time, when the safety door of the operating area is open, the PLC program controls the action of cutting off the chip conveyor and keeps it in a prohibited state.

[0020] The processing area self-cleaning function is set, and the NC program instruction control is integrated. In combination with the different cutting process requirements of the end user, the processing area self-cleaning function is turned on to open the water circuit solenoid valve to clean the iron chips accumulated in the processing area to prevent the accumulation of iron chips in the processing area. At the same time, in combination with the different cutting workpieces of the end user, the workpiece posture is changed by moving the X, Y, Z, and B axes to meet the in-machine cleaning requirements of various complex parts.

[0021] Equipped with work area air purification device, and can complete NC-PLC interactive control of opening and closing of processing area air purification device through NC command code. Add processing area air purification device start command before the NC processing program corresponding to the important detection point of user workpiece processing, and clear the processing area water mist at the detection point for easy observation, solve the problem of difficult manual observation during processing, and improve the performance of machine tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2It is a schematic diagram of the control flow of the processing area safety door action of the present invention.

[0024] Figure 3 Schematic diagram of the control program for prohibiting NC program startup for PLC.

[0025] Figure 4 This is a schematic diagram of the operation area safety door action control process.

[0026] Figure 5 It is a control flow diagram of the present invention.

[0027] Figure 6 It is a schematic diagram of the structure of the air purification device 3 in the processing area.

[0028] Figure 7 It is a structural schematic diagram of the self-cleaning function of the processing area and the workpiece on-machine cleaning device 5. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown: a horizontal machining center whole machine protective cover, including a whole machine protective cover body 9, a processing area safety door 2 is arranged on the front inner side of the whole machine protective cover body 9, the processing area safety door 2 is controlled by the processing area safety door driving cylinder 4, a safety light curtain 1 is arranged on the outer side of the whole machine protective cover body 9, the safety light curtain 1 is used to detect the situation within the travel range of the processing area safety door 2, an operating area safety door 6 is arranged on the right side of the whole machine protective cover body 9, and a processing area air purification device 3 and a processing area self-cleaning function and a workpiece on-machine cleaning device 5 are arranged on the top of the whole machine protective cover body 9.

[0031] like Figure 2As shown: The control of the safety door in the processing area is essentially the interactive control of the automatic door driven by the cylinder, the safety light curtain, and the numerical control system NC and PLC. There are two control modes: manual and automatic. In the manual mode, the button switch is used as the signal source for opening and closing. At the same time, in order to avoid the operator opening the safety door of the processing area at an inappropriate time due to accidental touch, the manual processing area door opening is delayed in the PLC control program. The delay time of manual opening is set through the DB address and set to 3S. That is, in the JOG mode and the machine tool is in a static state, pressing the safety door opening button for 3S will connect the middle M address, and the opening and closing actions of the safety door in the processing area will be controlled by the state change of the middle M address. In the automatic mode, the M command of the NC is used as the signal source. When the M command of opening or closing is received, the solenoid valve is controlled to execute the action. When executing the closing action in both modes, the safety light curtain is used for real-time monitoring. Once an obstacle is detected entering the monitoring range, the closing action is terminated to achieve safety interlock. The action will continue if the obstacle is removed within the time without triggering the alarm. The closing action is completed when the door is fully closed and the actual input point signal of the fully closed door is detected.

[0032] like Figure 3 As shown: In the PLC program, the obstacle blocking the closing state is timed. If the obstacle blocks the light curtain for more than 10 seconds, a system alarm is issued to terminate the door closing action and the NC program is prohibited from starting again. In this state, even if the obstacle is removed, the door will not continue to execute the closing action.

[0033] When the NC machining program is called automatically, the "PROGRAM_BEGIN" subroutine is called at the beginning of the machining program, and the system NC-PLC internal interactive variables are used to monitor the status of the safety light curtain again. Once the system variable $A_IN

[18] is not detected to be 1 within the set time, the NC alarm is triggered while the PLC alarm is triggered to interrupt the NC program execution, thus realizing the double insurance of automatic control of the machining area door.

[0034] like Figure 3 As shown: near the machining center operation station, an operating area safety door is configured to facilitate the operator to observe the situation in the machining area and debug the machining program. To avoid opening the operating area safety door during the machining process, a safety electronic lock is configured on the operating area safety door, and the opening and closing of the electronic lock is controlled by a button.

[0035] like Figure 4 As shown: In order to avoid the accumulation of waste chips generated during the processing, a chip conveyor is installed in the processing area of ​​the machine tool to collect and process the waste chips in a unified manner. If personnel enter the processing area to maintain and repair the equipment, they may touch the chip conveyor. If the chip conveyor is in operation or suddenly started at this time, unpredictable damage may occur.

[0036] To prevent such accidents, the chip conveyor startup needs to be processed in the PLC program. By collecting the door closing detection signals of the processing area safety door and the operation area safety door, the chip conveyor startup is interlocked to prohibit the chip conveyor startup when the safety door is not closed. At the same time, the safety door detection signal is shielded in the PLC program using the DB address, so that the chip conveyor can be used in special circumstances.

[0037] Conditional restrictions are imposed on the M instructions for manual and automatic start of the chip conveyor. The chip conveyor can only be started when the safety doors of the machining area and the operating area are closed at the same time. If the chip conveyor has been started and the safety door is opened due to some special circumstances, then simply restricting the start will not achieve the effect of safety protection, so conditional interlocking of the chip conveyor stop action is required. Introduce the information prompt DB2.DBX208.2 of the machining area safety door not being closed in place and the information prompt DB2.DBX208.3 of the operating area safety door not being closed in place on the trigger channel for the chip conveyor stop, which is used to forcibly stop the chip conveyor when the safety door is opened after the chip conveyor is started. Figure 4 shown.

[0038] The control of the self-cleaning device in the processing area is as follows.

[0039] When the water tank level is not low, the M command is triggered to make the external cooling pump work to pump water from the water tank, and at the same time, the solenoid valve controlling the spray water circuit is turned on, so that water is sprayed from the top of the whole machine shield to rinse the processing area. After the cleaning is completed, the M command controls the action to stop. In order to prevent the state of continuous spraying caused by leakage operation, the program stop "M30" can also stop the cleaning function.

[0040] Call the "PROGRAM_END" subroutine before the end of the NC machining program. Use the M command in the subroutine to open the top spray solenoid valve for on-machine cleaning of the workpiece. At the same time, replace the internal cooling tool for workpiece cleaning, execute the on-machine cleaning NC program corresponding to the machined workpiece, and cooperate with the B-axis turntable to perform all-round cleaning of the workpiece's machining holes, surfaces, grooves, etc., and clean the machining area to achieve self-cleaning of the machining area and on-machine cleaning of the workpiece.

[0041] Control and use of air purification equipment in processing areas

[0042] The purification device is started to extract the water mist from the processing area, so that the operator can better observe the situation in the processing area. The extracted water mist is condensed and collected and stored uniformly so as not to affect the environment around the processing center.

[0043] like Figure 5 As shown:

[0044] A control method for a whole machine protective cover of a horizontal machining center comprises the following steps;

[0045] After the NC controller receives the processing area safety door closing command issued by the NC program, it transmits the command to the PLC through the NC command data area. The PLC makes judgments and controls through the PLC program, and transmits the command through the PROFIBUS bus distributed I / O interface module. The distributed I / O interface module transmits the command again to the distributed I / O digital output module 1 and the distributed I / O digital output module 2, converts the control command into an output 24V voltage control signal, and controls the processing area safety door 2 to open through the processing area safety door drive cylinder 4. The two air supply solenoid valves act at the same time to meet the simultaneous opening of the processing area safety door 2, forming Synchronous action, output pressure air to the processing area safety door driving cylinder 4, and finally control the processing area safety door 2 to complete the closing of the processing area safety door; at the same time, the processing area safety door opening detection switch 1 and the processing area safety door opening detection switch 2 detect the safety door position status, and transmit the detection status to the distributed I / O input module 1 and the distributed I / O input module 2, and encode the signal into PROFIBUS bus data through the distributed I / O interface module and transmit it to the PLC. The PLC program performs real-time detection and judgment and transmits this detection signal to the NC-PLC data interaction area for real-time double detection of the NC program;

[0046] After receiving the instruction to open the operating area safety door, the PLC performs judgment and control through the PLC program. When the conditions are met, the instruction is transmitted to the S7-300 PLC interface module through the PROFIBUS bus. The S7-300 PLC interface module transmits the instruction to the S7-300 PLC digital output module 1 again, converts the control instruction into an output 24V voltage control signal, and controls the opening and closing of the operating area safety door 6, and the electromagnetic coil of the electronic lock of the operating area safety door is turned on to release the locked state. At the same time, the state signal is encoded into PROFIBUS bus data through the distributed I / O interface module through the 6S7-300 PLC digital input module 1, and transmitted to the PLC for real-time detection and judgment by the PLC program;

[0047] After receiving the start instruction of the processing area self-cleaning function and the workpiece on-machine cleaning device 5 on-machine cleaning function from the NC program, the NC controller transmits the instruction to the PLC through the NC instruction data area. The PLC makes judgment and control through the PLC program, and transmits the instruction to the S7-300 PLC interface module through the PROFIBUS bus. The S7-300 PLC interface module transmits the instruction to the S7-300 PLC digital output module again, converts the control instruction into an output 24V voltage control signal, and controls the processing area self-cleaning function and the workpiece on-machine cleaning device 5 on-machine cleaning function. The water supply solenoid valve is turned on, and pressure clean water is output to the processing area self-cleaning function and the workpiece on-machine cleaning device 5, and finally the processing area self-cleaning and workpiece on-machine cleaning are completed.

[0048] After receiving the start-up instruction of the processing area air purification device issued by the NC program, the NC controller transmits the instruction to the PLC through the NC instruction data area. The PLC makes judgment and control through the PLC program, and transmits the instruction to the S7-300 PLC interface module through the PROFIBUS bus. The S7-300 PLC interface module transmits the instruction to the S7-300 PLC digital output module again, converts the control instruction into an output control signal, controls the processing area air purification device 3, and completes the processing area air purification.

[0049] like Figure 6 As shown: the processing area air purification device 3 is divided into three parts: the processing area air purification device filter 10, the processing area air purification device exhaust port 11, and the processing area air purification device drain port 12. The processing area air purification device filter 10 is installed and connected to the middle position of the left side of the entire machine protective cover body 9, and the processing area air purification device exhaust port 11 is located on the right side of the processing area air purification device filter 10, which is used to extract the water-containing gas in the internal space of the entire machine protective cover body, filter it through the processing area air purification device filter 10, remove the water, and discharge the excess water through the processing area air purification device drain port 12 by gravity.

[0050] like Figure 7As shown: the processing area self-cleaning function and workpiece on-machine cleaning device 5 is divided into four parts: the processing area self-cleaning function and workpiece on-machine cleaning device water inlet 13, the processing area self-cleaning function and workpiece on-machine cleaning device mounting bracket 14, the processing area self-cleaning function and workpiece on-machine cleaning device guide water pipe 15, and the processing area self-cleaning function and workpiece on-machine cleaning device spray port 15. The processing area self-cleaning function and workpiece on-machine cleaning device 5 is installed and connected to the middle position inside the whole machine protective cover body 9 through the processing area self-cleaning function and workpiece on-machine cleaning device mounting bracket 14, and the lower part of the processing area self-cleaning function and workpiece on-machine cleaning device mounting bracket 14 is connected to the processing area self-cleaning function and workpiece on-machine cleaning device diversion pipe 15, and the water channel control solenoid valve configured for the processing area self-cleaning and workpiece on-machine cleaning function is connected to the processing area self-cleaning function and workpiece on-machine cleaning device water inlet 13 located at the upper left corner of the annular rectangular processing area self-cleaning function and workpiece on-machine cleaning device diversion pipe 15, and the cleaning water flow is sent to various positions of the annular rectangular conduit through the processing area self-cleaning function and workpiece on-machine cleaning device diversion pipe 15, and is sprayed to various positions inside the whole machine protective cover through multiple processing area self-cleaning function and workpiece on-machine cleaning device spray ports 16 installed on the processing area self-cleaning function and workpiece on-machine cleaning device diversion pipe 15, so as to realize the processing area self-cleaning function and workpiece on-machine cleaning function with high-pressure water flow.

[0051] The present application configures the automatic safety door control of the processing area with a safety light curtain to perform safety detection during the operation process. Once a foreign object is detected entering the detection range during the operation, the PLC program will control the automatic safety door of the processing area to cut off the operation. At the same time, the NC processing program will issue an alarm to block the NC program from continuing to execute. The PLC program control prohibits the NC program from being started again to prevent human error. The NC program can only be executed again after the machine tool reset command is executed, which greatly improves the safety of the automatic safety door control of the processing area and forms a real-time linkage interlocking control with the PLC and NC.

[0052] This application is configured with an electronic lock. The safety door of the operating area can only be opened when manual operation is performed. When the safety door of the operating area is open, the PLC program prohibits the NC program from starting and executing to prevent safety hazards caused by misoperation and misaction. At the same time, when the safety door of the operating area is open, the PLC program controls the action of cutting off the chip conveyor and maintains the prohibited state.

[0053] This application is equipped with a self-cleaning function for the processing area, which can be controlled by NC program instructions. The self-cleaning function of the processing area is turned on in combination with the different cutting process requirements of the end user to turn on the water circuit solenoid valve. Under the action of the pressure water flow, the accumulated iron filings in the processing area are automatically cleaned to prevent the accumulation of iron filings in the processing area. At the same time, after the processing is completed, an NC processing program that meets the cleaning requirements is developed in combination with the different cutting workpieces of the end user. The posture of the workpiece is changed by moving the X, Y, Z, and B axes to meet the cleaning requirements. At the same time, the NC-PLC interactive control is completed through the NC instruction code to control the opening and closing of the water circuit solenoid valve for the self-cleaning of the processing area and the workpiece on-machine cleaning function. This application is equipped with an air purification device for the work area, and the NC-PLC interactive control of the opening and closing of the air purification device for the processing area can be completed through the NC instruction code. The start-up instruction of the air purification device for the processing area is added before the NC processing program corresponding to the important detection point of the user's workpiece processing, and the water mist in the processing area can be cleared at the detection point for easy observation.

Claims

1. A control method for a protective cover of a horizontal machining center, characterized in that: The method comprises the following steps: after receiving the processing area safety door closing instruction issued by the NC program, the NC controller transmits the instruction to the PLC through the NC instruction data area; the PLC performs judgment and control through the PLC program, transmits the instruction through the PROFIBUS bus distributed I / O interface module; the distributed I / O interface module transmits the instruction again to the distributed I / O digital quantity output module 1 and the distributed I / O digital quantity output module 2, converts the control instruction into an output 24V voltage control signal, and controls the processing area safety door (2) to open through the processing area safety door driving cylinder (4); the two air supply solenoid valves are actuated simultaneously to meet the simultaneous opening of the processing area safety door (2). Start, form synchronous action, output pressure air to the processing area safety door driving cylinder (4), and finally control the processing area safety door (2) to complete the closing of the processing area safety door; at the same time, the processing area safety door opening position detection switch 1 and the processing area safety door opening position detection switch 2 detect the safety door position state, and transmit the detection state to the distributed I / O input module 1 and the distributed I / O input module 2, and encode the signal into PROFIBUS bus data through the distributed I / O interface module and transmit it to the PLC, the PLC program performs real-time detection and judgment and transmits the detection signal to the NC-PLC data interaction area for real-time double detection of the NC program; After receiving the instruction to open the operating area safety door, the PLC performs judgment and control through the PLC program. When the conditions are met, the instruction is transmitted to the S7-300PLC interface module through the PROFIBUS bus. The S7-300PLC interface module transmits the instruction to the S7-300PLC digital output module 1 again, converts the control instruction into an output 24V voltage control signal, and controls the opening and closing of the operating area safety door (6). The electromagnetic coil of the electronic lock of the operating area safety door is turned on and the locked state is released. At the same time, the state signal is encoded into PROFIBUS bus data through the S7-300PLC digital input module 1 through the distributed I / O interface module, and transmitted to the PLC for real-time detection and judgment by the PLC program; After receiving the start instruction of the processing area self-cleaning function and the workpiece on-machine cleaning device (5) on-machine cleaning function from the NC program, the NC controller transmits the instruction to the PLC through the NC instruction data area. The PLC performs judgment and control through the PLC program and transmits the instruction to the S7-300PLC interface module through the PROFIBUS bus. The S7-300PLC interface module transmits the instruction to the S7-300PLC digital output module again, converts the control instruction into an output 24V voltage control signal, controls the processing area self-cleaning function and the workpiece on-machine cleaning device (5) on-machine cleaning function, turns on the water supply solenoid valve, outputs pressure clean water to the processing area self-cleaning function and the workpiece on-machine cleaning device (5), and finally completes the processing area self-cleaning and workpiece on-machine cleaning. After receiving the start-up instruction of the processing area air purification device issued by the NC program, the NC controller transmits the instruction to the PLC through the NC instruction data area. The PLC performs judgment and control through the PLC program, and transmits the instruction to the S7-300PLC interface module through the PROFIBUS bus. The S7-300PLC interface module transmits the instruction to the S7-300PLC digital output module again, converts the control instruction into an output control signal, controls the processing area air purification device (3), and completes the processing area air purification. The method is implemented by a whole machine protective cover of a horizontal machining center. The whole machine protective cover of the horizontal machining center comprises a whole machine protective cover body (9). A processing area safety door (2) is arranged at the inner front position of the whole machine protective cover body (9). The processing area safety door (2) is controlled by a processing area safety door driving cylinder (4). A safety light curtain (1) is arranged on the outer side of the whole machine protective cover body (9). The safety light curtain (1) is used to detect the situation within the travel range of the processing area safety door (2). An operating area safety door (6) is arranged on the right side of the whole machine protective cover body (9). A processing area air purification device (3) and a processing area self-cleaning function and a workpiece on-machine cleaning device (5) are arranged on the top of the whole machine protective cover body (9).

2. The control method of the protective cover of the horizontal machining center according to claim 1 is characterized in that: The operating area safety door (6) is provided with an operating area safety door observation port (8).

3. The control method of the protective cover of the horizontal machining center according to claim 1 is characterized in that: The processing area air purification device (3) comprises a processing area air purification device filter (10), the processing area air purification device filter (10) is an "L"-shaped structure, and the vertical end is close to the inner side of the whole machine protective cover body (9), and the processing area air purification device air suction port (11) is located on the vertical end of the processing area air purification device filter (10) and is used to extract the water-containing gas in the internal space of the whole machine protective cover body (9). The processing area air purification device drain port (12) is arranged at the horizontal end of the processing area air purification device filter (10) and away from the whole machine protective cover body (9). The processing area air purification device filter (10) is used to convert the air extracted by the processing area air purification device air suction port (11) into water and discharge it through the processing area air purification device drain port (12).

4. The control method of the protective cover of the horizontal machining center according to claim 1 is characterized in that: The processing area self-cleaning function and workpiece on-machine cleaning device (5) include horizontally symmetrical mounting brackets (14), through which a water guide pipe (15) is arranged, and a water inlet (13) is arranged on one side of the water guide pipe (15), and a plurality of spray ports (16) are opened below the water guide pipe (15), and the spray ports (16) are used to spray water to various positions inside the protective cover of the whole machine.

5. The control method of the protective cover of the horizontal machining center according to claim 1 is characterized in that: The processing area safety door driving cylinder (4) is provided with an air circuit solenoid valve, and the processing area air purification device (3) and the processing area self-cleaning function and workpiece on-machine cleaning device (5) are provided with a water circuit solenoid valve, and the air circuit solenoid valve and the water circuit solenoid valve are controlled by an NC controller.

6. The control method of the protective cover of the horizontal machining center according to claim 1 is characterized in that: The whole machine protective cover body (9) is controlled by an NC controller, an electronic lock is arranged on the upper right corner of the operating area safety door (6), a chip conveyor is arranged inside the whole machine protective cover body (9), and the electronic lock and the chip conveyor are controlled by the NC controller.

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