Numerical control machining center side automatic induction door integrated reconstruction system

Abstract

The present application relates to automatic door opening and closing device technical field, especially to a kind of numerical control machining center side automatic induction door integrated reconstruction system, including integrated control module, double redundancy sensing unit, adjustable mechanical installation assembly, drive unit, machine tool PLC docking terminal strip and standardization integrated wiring harness.Double redundancy sensing unit uses microwave radar and waterproof infrared parallel configuration, effectively resist cutting fluid and iron filings interference;Adjustable mechanical installation assembly is fixed using original screw hole of machine tool, and it is installed without opening hole;Drive unit integrates hydraulic buffer and manual clutch, realize flexible opening and closing and power-off emergency door opening;Integrated control module is directly connected machine tool PLC safety loop by quick plug terminal strip, realize door opening and stop interlock.The present application solves the problem of low integration, cannot system interlock, high false trigger rate, power-off jam and poor versatility of existing reconstruction scheme, with the advantages of low reconstruction cost, high safety, fast installation, multi-model universal.

Description

Technical Field

[0001] This application relates to the field of automatic door opening and closing device technology, and in particular to an integrated retrofit system for an automatic sensor door on the side of a CNC machining center. Background Technology

[0002] With the continuous improvement of automation levels in manufacturing, CNC machining centers are widely used in the field of machining, especially in mass production and flexible manufacturing production lines, which place higher demands on the automation, safety, and continuity of the machining process. The side safety doors of vertical CNC machining centers, serving as a safety barrier between operators and the machining chamber, are no longer sufficient to meet the needs of automated loading and unloading and unattended production under manual push-pull mode. Therefore, the automation transformation of manual side doors has become a common industry requirement.

[0003] Currently, the common practice for retrofitting side doors of old machine tools is to use a separate installation solution, which involves separately purchasing infrared diffuse reflection sensor switches, external 24V independent controllers, pneumatic drive cylinders, and external limit switches, and assembling them piecemeal. The control circuit of this solution is completely independent of the machine tool's original CNC system PLC, and there is no data exchange with the machine tool's start / stop, automatic loading / unloading, and safety interlock functions. In practical applications, this type of solution has the following shortcomings: the components are from different suppliers, the controller requires external drilling for installation, resulting in messy on-site wiring, low integration, and high retrofit costs; the external controller cannot communicate with the machine tool PLC, the door status signal cannot be connected to the safety circuit, and the machine tool cannot be interlocked to stop when the door is opened, posing a safety hazard; the infrared sensor is easily blocked by cutting fluid mist and metal chips, leading to frequent false triggers; the door locks after power or gas failure, and cannot be manually opened in an emergency; moreover, most retrofit parts are non-standard customized, with each part only compatible with a single machine model, making it difficult to achieve mass standardization and promotion.

[0004] In summary, existing side door modification solutions suffer from technical problems such as low integration, inability to achieve safety interlocking with machine tool CNC systems, poor anti-interference capability, inconvenience in emergency operation during power outages, and poor versatility across multiple machine models. There is an urgent need for an integrated, interlockable, highly reliable, and standardized modification solution. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated retrofit system for automatic side-mounted sensor doors in CNC machining centers, which solves the problems of low integration of existing side-mounted door automation retrofit schemes, inability to achieve safety interlock with machine tool CNC systems, poor resistance of sensor units to interference from cutting fluid and iron filings, inability of the door to open in emergency situations during power outages and gas outages, and poor universality of retrofit kits across multiple machine models.

[0006] This invention provides the following solution: An integrated retrofit system for automatic sensor doors on the side of a CNC machining center includes: Integrated control module, dual redundant sensing unit, adjustable mechanical mounting assembly, drive unit, machine tool PLC docking terminal block and integrated wiring harness; The dual-redundant sensing unit is used to detect proximity signals and send them to the integrated control module; The adjustable mechanical mounting assembly is used to support and guide the movement of the side door, and is fixed using the existing mounting holes of the machine tool; The drive unit is connected to the side door body and is used to receive drive signals to drive the door body to open and close. The machine tool PLC docking terminal block is used to plug and detachably connect the integrated control module to the machine tool CNC system to transmit door status signals; The integrated control module is connected to the dual redundant sensing unit, the drive unit, and the machine tool PLC docking terminal block via the standardized integrated wiring harness. It is configured to: in response to receiving the proximity signal, output a door opening drive signal to the drive unit, and simultaneously send a door opening status signal to the machine tool CNC system via the machine tool PLC docking terminal block to trigger a safety interlock; after a preset delay, control the drive unit to close the side door, and upon receiving a feedback signal indicating that the door is fully closed, send a door closing status signal to the machine tool CNC system via the machine tool PLC docking terminal block to release the safety interlock.

[0007] As a further improvement of the present invention, the dual-redundant sensing unit includes a microwave radar sensor and a waterproof infrared sensor, which are arranged in parallel with redundancy; the microwave radar sensor is used to penetrate water mist and iron filings for detection, and the waterproof infrared sensor is used for short-range blind spot detection; when either the microwave radar sensor or the waterproof infrared sensor is triggered, the proximity signal is sent to the integrated control module.

[0008] As a further improvement of the present invention, the adjustable mechanical mounting assembly includes a telescopic fixed bracket and a finely adjustable linear guide rail; the telescopic fixed bracket is provided with a screw telescopic structure, the travel of which is adjustable in the left and right directions and the up and down directions, and is configured to be fixed using the original sheet metal screw holes on the side of the CNC machining center, without the need to open new mounting holes; the finely adjustable linear guide rail is provided with a dustproof brush for removing iron filings on the guide rail when the door moves.

[0009] As a further improvement of the present invention, the drive unit is a pneumatic cylinder or a DC geared motor, and the integrated modification system provides a mounting base that is compatible with both pneumatic cylinder installation and DC geared motor installation; the drive unit integrates an adjustable hydraulic buffer and a speed regulating throttle valve to enable the side door to open and close flexibly.

[0010] As a further improvement of the present invention, the drive unit also integrates a mechanical manual clutch mechanism, which includes a paddle; when the drive unit is normally powered or ventilated, the paddle keeps the drive unit in a transmission connection with the side door; when the drive unit is powered or ventilated, the paddle is moved to disengage the drive unit from the side door, allowing the door to be manually pushed and pulled.

[0011] As a further improvement of the present invention, the integrated control module has a built-in main control board, a system protocol conversion chip and a time delay relay; the machine tool PLC docking terminal block is a quick-connect terminal block with pre-set I / O pins corresponding to various CNC system standards. The integrated control module can be directly plugged into the idle I / O port of the machine tool through the quick-connect terminal block without cutting wires or modifying the underlying program of the machine tool PLC.

[0012] As a further improvement of the present invention, the integrated control module is also configured to: cut off the power supply or air supply of the drive unit after the side door is completely closed and stationary for more than a preset sleep time, so that the system enters a low-power standby state.

[0013] As a further improvement of the present invention, the safety interlock action includes: controlling the spindle of the CNC machining center to stop rotating and locking the feed motion of the XYZ axes; if the side door is accidentally opened while the CNC machining center is in the process of machining, the integrated control module causes the machine tool CNC system to immediately execute the safety interlock action through the door opening status signal.

[0014] As a further improvement of the present invention, the dual redundant sensing unit is installed on the inner side of the side door frame.

[0015] As a further improvement of the present invention, the dual redundant sensing unit is equipped with a stainless steel dustproof protective cover and is fixed at an angle of 45°.

[0016] The above solution achieves the following beneficial technical effects: The automatic sensor door integrated retrofit system for CNC machining centers provided by this invention, through an integrated control module, dual redundant anti-interference sensing units, adjustable hole-free mechanical mounting assembly, dual-purpose drive unit with manual clutch, and multi-system compatible quick-connect PLC terminal block, realizes standardized complete retrofit, effectively solving the problems of low integration, lack of safety interlocks, false triggering of sensors, power failure jamming, and poor model versatility of existing separate retrofit solutions. Its beneficial effects include: modular and complete supply, factory pre-installation and pre-adjustment, installation using the machine tool's original screw holes, no need to break wires or modify the PLC's underlying program, significantly reducing modification costs and greatly shortening working hours; door status signals are directly connected to the machine tool's safety circuit, realizing system-level interlocking that stops the machine as soon as the door is opened, eliminating safety accidents; microwave plus infrared dual-redundant sensing configuration resists interference from cutting fluid and iron filings, with high sensing accuracy, and combined with adjustable hydraulic buffer and frequency conversion speed regulation to achieve flexible opening and closing, greatly reducing the failure rate; the drive unit integrates a mechanical manual clutch device, which can easily switch to manual mode when power or gas is cut off, making maintenance convenient; the adjustable telescopic bracket and guide rail structure are compatible with a variety of mainstream machine models, and one kit can cover most vertical machining centers, with strong versatility and reduced spare parts inventory. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of an integrated retrofit system for an automatic sensor door on the side of a CNC machining center, according to an embodiment of the present invention, is shown.

[0018] Figure 2 A schematic diagram of the workflow and interlocking logic according to an embodiment of the present invention is shown.

[0019] Figure 3 A schematic diagram of the physical installation structure of an integrated retrofit system for an automatic sensor door on the side of a CNC machining center, according to an embodiment of the present invention, is shown. Detailed Implementation

[0020] 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 only some, not all, of the embodiments of the present invention. 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.

[0021] In the description of this invention, it should be understood that the terms "front," "rear," "axial," etc., indicating orientation or positional relationships are based on the orientation that the operator is accustomed to facing during testing, and are only for the convenience and simplification of description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "installation," "connection," and "fixing" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection, unless otherwise explicitly specified and limited.

[0022] In the production process of CNC machining centers, the standard side protective doors for vertical machining centers are mostly manually operated push-pull doors, with a few newer machines offering optional automatic doors driven by independent cylinders or motors. However, in the field of retrofitting older machine tools, a split-type installation solution is commonly used. This involves purchasing infrared sensor probes, independent drive cylinders, and external control boxes separately. Their wiring and control are completely independent of the machine tool's original CNC system PLC, representing a piecemeal retrofit approach. This conventional retrofit typically consists of an infrared diffuse reflection sensor switch, an external 24V independent controller, a pneumatic cylinder, and external limit switches. It uses separate wiring and a separate air source, and there is no data exchange with the machine tool's original machining start / stop, automatic loading / unloading, and safety interlock functions.

[0023] The existing technologies mentioned above have five major drawbacks: First, the modifications are fragmented and poorly integrated, resulting in high modification costs; second, they cannot be linked with the original machine tool system, leading to the failure of safety interlocks; third, they have poor fault tolerance and a high failure rate, with frequent false triggering in the waste chip environment; fourth, there is no emergency start / stop function in case of power or gas outages, making maintenance and repair inconvenient; and fifth, they have poor versatility, with modification kits not being compatible with multiple machine models.

[0024] In view of this, the present invention proposes an integrated retrofit system for automatic sensor doors on the side of CNC machining centers. Through standardized integrated retrofit assemblies and PLC protocol interfacing with the machine tool, the system achieves a one-stop transformation from manual to automatic sensor doors, realizing a low-cost, standardized upgrade with full system linkage. The invention will now be described in detail with reference to embodiments and accompanying drawings.

[0025] This invention provides an integrated retrofit system for an automatic sensor door on the side of a CNC machining center. (Refer to...) Figure 1-3 The system includes an integrated control module, dual redundant sensing units, an adjustable mechanical mounting assembly, a drive unit, a machine tool PLC docking terminal block, and standardized integrated wiring harnesses.

[0026] In this embodiment of the invention, the components are connected by standardized integrated wiring harnesses, and pre-wiring and pre-testing are completed before leaving the factory, forming a modular complete product. On-site assembly is straightforward, requiring no non-standard processing. The following is a detailed description of each component and the system's workflow.

[0027] The dual-redundant sensing unit is used to detect proximity signals and send them to the integrated control module. To overcome sensing failures caused by cutting fluid mist and metal chip splashes at the machining site, in some embodiments of the present invention, the dual-redundant sensing unit includes a microwave radar sensor and a waterproof infrared sensor, which are arranged in parallel for redundancy. The microwave radar sensor can penetrate water mist and thin metal chip obstructions for detection, while the waterproof infrared sensor is used for near-range blind spot detection. When either sensor is triggered, it outputs a valid proximity signal to the integrated control module. As a preferred installation method, the dual-redundant sensing unit is installed inside the side door frame and equipped with a stainless steel dustproof protective cover, and fixed at a 45° angle to ensure the sensing area while reducing direct chip accumulation.

[0028] The adjustable mechanical mounting assembly is used to support and guide the movement of the side door and is fixed using the existing mounting holes on the machine tool. In some embodiments of the present invention, the adjustable mechanical mounting assembly includes a telescopic fixing bracket and a fine-tunable linear guide. The telescopic fixing bracket is equipped with a lead screw telescopic structure, whose travel in the left-right and up-down directions is adjustable (e.g., ±50mm), and can be directly fastened using the existing sheet metal screw holes on the side of the CNC machining center, without the need to drill new holes on the machine tool protective cover, avoiding destructive modifications. The fine-tunable linear guide is equipped with a dustproof brush to remove iron filings adhering to the guide in real time during the movement of the door, preventing jamming.

[0029] The drive unit, connected to the side door, receives drive signals to open and close the door. To adapt to different workshop conditions, in some embodiments of the invention, the drive unit is a pneumatic cylinder or a DC geared motor, and the integrated retrofit system provides a mounting base compatible with both pneumatic cylinder and DC geared motor installations. The drive unit integrates an adjustable hydraulic damper and a speed-regulating throttle valve to enable flexible opening and closing of the side door, preventing door deformation due to impact. Furthermore, to handle sudden power or gas outages, the drive unit also integrates a mechanical manual clutch mechanism, including a paddle. Under normal power or gas supply, the paddle maintains the drive unit's connection to the side door; in the event of a power or gas outage, the operator can simply move the paddle to disengage the drive unit from the door, allowing manual pushing and pulling of the door to meet emergency maintenance and cleaning needs.

[0030] The machine tool PLC docking terminal block is used to pluggably connect the integrated control module to the machine tool CNC system to transmit door status signals. In some embodiments of the present invention, the integrated control module has a built-in main control board, a system protocol conversion chip, and a time delay relay. The machine tool PLC docking terminal block is a quick-connect terminal block with pre-installed I / O pins corresponding to various CNC system standards such as FANUC, Mitsubishi, Syntec, and KND. During field installation, the integrated control module is directly plugged into an unused I / O port of the machine tool electrical control cabinet via the quick-connect terminal block, without the need for wire cutting or modification of the machine tool PLC's underlying program, thus completing the system interlocking docking.

[0031] The integrated control module, connected to the dual redundant sensing unit, the drive unit, and the machine tool PLC terminal block via the standardized integrated wiring harness, serves as the core control component of the system and is configured to execute the following workflow: In response to a proximity signal received from the dual redundant sensing unit (e.g., a person or a loading / unloading robot approaching), the integrated control module outputs an opening drive signal to the drive unit, controlling the side door to slide and open along the guide rail of the adjustable mechanical mounting assembly. Simultaneously with the door opening, the integrated control module sends a door opening status signal to the machine tool's CNC system via the machine tool PLC interface terminal block to trigger a safety interlock. In this embodiment, the safety interlock action includes controlling the spindle of the CNC machining center to stop rotating and locking the feed motion of the XYZ axes. Thus, the machine tool's cutting action is immediately prohibited upon door opening, preventing personal injury. In automated loading / unloading scenarios, the robot's arrival triggers door opening, and the door closes after a delay after processing, enabling unattended continuous production.

[0032] After a preset delay, if the sensing signal is not triggered again, the integrated control module controls the drive unit to close the side door. Upon receiving a feedback signal indicating that the door is fully closed (such as from a limit switch), it sends a door-closed status signal to the machine tool CNC system via the machine tool PLC terminal block to release the safety interlock, and the machine tool resumes normal processing. During processing, if the side door is accidentally opened, the integrated control module will immediately send a door-open status signal to the machine tool CNC system to execute the aforementioned safety interlock action, instantly stopping the spindle and feed to ensure on-site safety. In this embodiment, the preset delay can be set to 5 to 30 seconds, preferably 10 seconds.

[0033] As an optimized energy-saving and noise-reduction solution, in some embodiments of the present invention, the integrated control module is further configured to: cut off the power supply or air supply to the drive unit after the side door is completely closed and stationary for more than a preset sleep time, causing the system to enter a low-power standby state. When an approach signal is detected again, the system quickly wakes up and performs the door opening action. Preferably, in this embodiment, the preset sleep time is set to 1 minute.

[0034] The working process of the present invention will be described below with reference to a specific application example.

[0035] In this embodiment, the Okuma 460 and Okuma 560 machine tools were modified to have automatic side-mounted sensor doors. Both machine tools use the OKUMA system, and the original machine tools only had a front manual sliding door and no side doors. The pneumatic integrated modification system of this invention was selected for modification and debugging. The installation steps are as follows: According to the side door installation position requirements, the side guard plate of the machine tool was cut and removed; dual redundant sensing units were fixed on both sides of the outer door frame of the machine tool and quickly connected to the integrated control module through the integrated wiring harness; the cylinder was fixed to the reserved installation position of the adjustable mechanical mounting assembly bracket, and the air source was connected to the workshop compressed air pipeline through the quick-connect connector; the quick-connect terminal block of the integrated control module was connected to the idle I / O point of the machine tool electrical control cabinet without modifying the internal wiring of the machine tool and the underlying system parameters. During debugging, a door closing delay of 12 seconds and a cylinder buffer position were set on the integrated control module. Test results: The door opens automatically when a person approaches and closes automatically 12 seconds after they leave; the machine tool spindle cannot start when the door is open, and the machine stops immediately if the door is opened during processing; after a power outage, the side door can be manually pushed open smoothly by moving the clutch lever. After 30 days of continuous operation, there were no sensor malfunctions or door jamming.

[0036] In addition to the embodiments described above, the present invention can also employ equivalent alternatives without departing from its core integration and modification concept. For example, the microwave and infrared dual-sensor unit can be replaced with a protective structure combining laser ranging sensing and a touch safety edge; the pneumatic or electric drive unit can be replaced with a lead screw electric push rod to drive the door body to move, while retaining the manual clutch and adjustable bracket structure; and the hardware I / O direct-plug interface can be replaced with a wireless communication module to realize wireless data interaction between the control module and the machine tool PLC. These alternatives all fall within the protection scope of the present invention.

[0037] Reference Figure 3 The physical installation layout of the integrated modification system of the present invention on the side of the CNC machining center is as follows: The machine tool main body housing 1 serves as the main load-bearing frame of the CNC machining center. A manually operated sliding protective door 5 is located at the side opening of the machine tool main body housing 1. An observation grid window 2 is located in the center of the manually operated sliding protective door 5 for observing the internal machining conditions. The machine tool main body housing 1 also features a left-side safety light curtain 3 and an upper safety light curtain 4, which are original safety protection components of the machine tool, respectively arranged vertically to the left of the manually operated sliding protective door 5 and horizontally above it.

[0038] The automatic door drive module 6 (i.e., drive unit) is vertically installed on the left side of the manual push-pull safety door 5. Its drive end is connected to the manual push-pull safety door 5 for driving the manual push-pull safety door 5 to open and close automatically along the guide rail. The lower end of the automatic door drive module 6 is provided with an emergency manual clutch unlocking mechanism 10 (i.e., mechanical manual clutch mechanism). In the event of a power outage or gas outage, the automatic door drive module 6 can be disengaged from the manual push-pull safety door 5 by operating the emergency manual clutch unlocking mechanism 10, so that the safety door can be manually pushed and pulled.

[0039] The dual-redundant sensor unit 7 (i.e., the dual-redundant sensing unit) is installed on the right side of the manual push-pull protective door 5. It adopts a parallel configuration of microwave radar and waterproof infrared to detect the proximity signals of personnel or loading / unloading robots. The lower operating control box 8 is the original operating and signal output box of the machine tool, located on the lower right side of the machine tool. The integrated control box 9 (i.e., the integrated control module) is fixedly installed above the lower operating control box 8. The integrated control box 9 is connected to the automatic door drive module 6, the dual-redundant sensor unit 7, and the machine tool CNC system PLC in the lower operating control box 8 through standardized integrated wiring harnesses to realize signal transfer and safety interlock control.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. An integrated retrofit system for an automatic sensor door on the side of a CNC machining center, characterized in that, include: Integrated control module, dual redundant sensing unit, adjustable mechanical mounting assembly, drive unit, machine tool PLC docking terminal block and integrated wiring harness; The dual-redundant sensing unit is used to detect proximity signals and send them to the integrated control module; The adjustable mechanical mounting assembly is used to support and guide the movement of the side door, and is fixed using the existing mounting holes of the machine tool; The drive unit is connected to the side door body and is used to receive drive signals to drive the door body to open and close. The machine tool PLC docking terminal block is used to plug and detachably connect the integrated control module to the machine tool CNC system to transmit door status signals; The integrated control module is connected to the dual redundant sensing unit, the drive unit, and the machine tool PLC docking terminal block via the standardized integrated wiring harness. It is configured to: in response to receiving the proximity signal, output a door opening drive signal to the drive unit, and simultaneously send a door opening status signal to the machine tool CNC system via the machine tool PLC docking terminal block to trigger a safety interlock; after a preset delay, control the drive unit to close the side door, and upon receiving a feedback signal indicating that the door is fully closed, send a door closing status signal to the machine tool CNC system via the machine tool PLC docking terminal block to release the safety interlock.

2. The integrated retrofit system for the automatic sensor door on the side of a CNC machining center according to claim 1, characterized in that, The dual-redundant sensing unit includes a microwave radar sensor and a waterproof infrared sensor, which are arranged in parallel for redundancy. The microwave radar sensor is used to detect objects that are obstructed by water mist and iron filings, while the waterproof infrared sensor is used to fill blind spots at close range. When either the microwave radar sensor or the waterproof infrared sensor is triggered, it sends the proximity signal to the integrated control module.

3. The integrated retrofit system for the automatic sensor door on the side of a CNC machining center according to claim 1, characterized in that, The adjustable mechanical mounting assembly includes a telescopic fixed bracket and a finely adjustable linear guide rail; the telescopic fixed bracket is equipped with a screw telescopic structure, the travel in the left and right directions and the up and down directions is adjustable, and it is configured to be fixed using the original sheet metal screw holes on the side of the CNC machining center, without the need to open new mounting holes; the finely adjustable linear guide rail is equipped with a dustproof brush, which is used to remove iron filings on the guide rail when the door moves.

4. The integrated retrofit system for automatic sensor doors on the side of CNC machining centers according to claim 1, characterized in that, The drive unit is a pneumatic cylinder or a DC geared motor. The integrated retrofit system provides a mounting base that is compatible with both pneumatic cylinder and DC geared motor installations. The drive unit integrates an adjustable hydraulic damper and a speed-regulating throttle valve to enable the side door to open and close flexibly.

5. The integrated retrofit system for the automatic sensor door on the side of a CNC machining center according to claim 4, characterized in that, The drive unit also integrates a mechanical manual clutch mechanism, which includes a paddle. When the drive unit is normally powered or supplied with air, the paddle keeps the drive unit in a transmission connection with the side door. When the drive unit is powered or supplied with air, the paddle can be moved to disengage the drive unit from the side door, allowing the door to be manually pushed or pulled.

6. The integrated retrofit system for the automatic sensor door on the side of a CNC machining center according to claim 1, characterized in that, The integrated control module has a built-in main control board, system protocol conversion chip and time delay relay; the machine tool PLC docking terminal block is a quick-connect terminal block with pre-set I / O pins corresponding to various CNC system standards. The integrated control module can be directly plugged into the idle I / O port of the machine tool through the quick-connect terminal block without cutting wires or modifying the underlying program of the machine tool PLC.

7. The integrated retrofit system for automatic sensor doors on the side of CNC machining centers according to claim 1, characterized in that, The integrated control module is also configured to cut off the power supply or air supply to the drive unit after the side door is completely closed and stationary for more than a preset sleep time, so that the system enters a low-power standby state.

8. The integrated retrofit system for the automatic sensor door on the side of a CNC machining center according to claim 1, characterized in that, The safety interlock action includes: controlling the spindle of the CNC machining center to stop rotating and locking the feed motion of the XYZ axes; if the side door is accidentally opened while the CNC machining center is in the process of machining, the integrated control module causes the machine tool CNC system to immediately execute the safety interlock action through the door opening status signal.

9. The integrated retrofit system for the automatic sensor door on the side of a CNC machining center according to claim 2, characterized in that, The dual-redundant sensing unit is installed inside the side door frame.

10. The integrated retrofit system for the automatic sensor door on the side of a CNC machining center according to claim 2, characterized in that, The dual-redundant sensing unit is equipped with a stainless steel dustproof protective cover and is fixed at a 45° angle.

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