阅读说明：本技术 一种数控铣床安全检测控制系统 (Safety detection control system of numerical control milling machine ) 是由 吴永坚 汪庆群 潘鸿健 余胜福 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种数控铣床安全检测控制系统,涉及设备监测技术领域,数控模块发出停止指令时,伺服驱动停止向主轴电机输出电压,但主轴电机会因为惯性的原因继续以相同方向旋转,从而使得主轴电机以发电机工况继续运行,向伺服驱动馈电,只要主轴电机转速不为零,伺服驱动的输出端电压就不为零,从而使得当主轴电机还在转动时,安全门开关则无法正常开启,当主轴电机转速为零时,则伺服驱动的输出电压为零,此时安全门开关则能够正常开启,同时当安全门为打开状态时,主轴电机则无法正常运行,从而避免了安全门在打开的情况下,人员进入安全门内后,设备运转对人员造成伤亡的问题,本发明大大的提高了数控铣床在生产运行过程中的安全性。(The invention discloses a safety detection control system of a numerical control milling machine, which relates to the technical field of equipment monitoring, when a numerical control module sends a stop instruction, a servo drive stops outputting voltage to a spindle motor, but the spindle motor can continuously rotate in the same direction due to inertia, so that the spindle motor can continuously operate under the working condition of a generator and feed power to the servo drive, as long as the rotating speed of the spindle motor is not zero, the voltage of the output end of the servo drive is not zero, so that when the spindle motor rotates, a safety door switch cannot be normally opened, when the rotating speed of the spindle motor is zero, the output voltage of the servo drive is zero, the safety door switch can be normally opened, and when the safety door is opened, the spindle motor cannot normally operate, so that the problem that the safety door is opened, and after personnel enter the safety door, the equipment operates to cause casualties to the personnel is solved, the invention greatly improves the safety of the numerical control milling machine in the production operation process.)

1. A safety detection control system of a numerical control milling machine comprises a door opening button, an IO module, a relay module and a numerical control module, and is characterized in that the door opening button is used for generating a door opening input signal and is electrically connected with the IO module; the IO module is connected with the relay module and the numerical control module, the IO module is used for sending a control signal of the numerical control module and a door opening input signal of the door opening button into the relay module, and the relay module is used for converting the control signal and the door opening input signal; the relay module is connected with zero-speed detection relay, zero-speed detection relay is used for detecting the running state of safety protection equipment and generating an input signal for opening the door, and zero-speed detection relay is electrically connected with the safety door switch.

2. The numerically controlled milling machine safety detection control system according to claim 1, wherein the safety door switch includes a solenoid valve and a latch device controlled by the solenoid valve, and a normally open contact and a normally closed contact are provided between the solenoid valve and the latch device.

3. The safety detection control system of claim 2, wherein when the safety door solenoid valve is energized and the latch device is pulled out, the normally open contact is closed and the normally closed contact is opened.

4. The safety detection control system of the numerical control milling machine according to claim 1, wherein the numerical control module is connected with a servo drive, and the servo drive is respectively connected with the spindle motor and the zero-speed detection relay.

5. The safety detection control system of the numerical control milling machine according to claim 4, wherein the detection process of the operation state of the zero-speed detection relay safety protection device comprises the following steps: a voltage detection circuit is arranged in the zero-speed detection relay, and the three-phase output voltage of the spindle motor is obtained through the voltage detection circuit; when the three-phase output voltage of the spindle motor is not 0, intercepting and invalidating a door opening input signal; when the three-phase output voltage of the spindle motor is 0, a door opening output signal is sent to the safety door switch.

6. The safety detection control system of the numerical control milling machine according to claim 5, wherein the spindle motor is provided with a generating coil.

7. The safety detection control system of the numerical control milling machine according to claim 5, wherein the safety door switch is installed on the safety door, when the safety door is in an open state, the normally closed contact in the safety door switch is opened, and the door closing in-place signal transmitted to the numerical control module through the relay module and the IO module is opened, so that the machine tool cannot run, and when the safety door is closed in place, the machine tool returns to normal operation.

8. The safety detection control system of the numerical control milling machine according to claim 4, wherein the numerical control module is connected with the servo drive through an optical cable, and the spindle motor is connected with the servo drive through a power line and an encoder line.

Technical Field

The invention belongs to the technical field of equipment monitoring, and particularly relates to a safety detection control system of a numerical control milling machine.

Background

At present, with the progress of society and the development of technology, the application of automation technology in industrial production is more and more extensive, so that the functions of machine equipment are more and more comprehensive, and the machine equipment becomes more and more huge and complex, therefore, strict requirements on the safety when the machine equipment is operated must be made, the quality of a machine is evaluated, and in addition to the degree of automation, whether the safety is guaranteed or not should be emphasized. The existing protective door of the numerical control milling machine is only opened manually, and the running state of the machine tool is not detected, so that the protective door can be opened under the condition that a main shaft of the machine tool is still rotated, a workpiece or an iron block can be thrown out of the protective door, and casualties are caused.

Disclosure of Invention

The invention aims to provide a safety detection control system of a numerical control milling machine, which solves the problem that the existing protective door of the numerical control milling machine is only opened manually and is not detected in the running state of a machine tool, so that the protective door can be opened under the condition that a main shaft of the machine tool rotates, workpieces or iron blocks can be thrown out of the protective door, and casualties are caused.

The purpose of the invention can be realized by the following technical scheme: a safety detection control system of a numerical control milling machine comprises a door opening button, an IO module, a relay module and a numerical control module, wherein the door opening button is used for generating a door opening input signal and is electrically connected with the IO module; the IO module is connected with the relay module and the numerical control module, the IO module is used for sending a control signal of the numerical control module and a door opening input signal of the door opening button into the relay module, and the relay module is used for converting the control signal and the door opening input signal; the relay module is connected with zero-speed detection relay, zero-speed detection relay is used for detecting the running state of safety protection equipment and generating an input signal for opening the door, and zero-speed detection relay is electrically connected with the safety door switch.

Furthermore, the emergency exit switch includes solenoid valve and the bolt device that is controlled by the solenoid valve, is provided with normally open contact and normally closed contact between solenoid valve and the bolt device.

Furthermore, the electromagnetic valve of the safety door is electrified, the bolt device is pulled out, the normally open contact is closed, and the normally closed contact is disconnected.

Furthermore, the numerical control module is connected with a servo drive, and the servo drive is respectively connected with the spindle motor and the zero-speed detection relay; the numerical control module is connected with the servo drive through an optical cable, and the spindle motor is connected with the servo drive through a power line and an encoder line.

Further, the detection process of the operation state of the zero-speed detection relay safety protection device includes: a voltage detection circuit is arranged in the zero-speed detection relay, and the three-phase output voltage of the spindle motor is obtained through the voltage detection circuit; when the three-phase output voltage of the spindle motor is not 0, intercepting and invalidating a door opening input signal; when the three-phase output voltage of the spindle motor is 0, a door opening output signal is sent to the safety door switch.

Furthermore, a power generation coil is arranged on the spindle motor.

Furthermore, the emergency exit switch is installed on the emergency exit, and when the emergency exit was in the open mode, the normally closed contact disconnection in the emergency exit switch, passed the signal disconnection that targets in place of closing the door that gives numerical control module through relay module, IO module to make the lathe unable operation, when the emergency exit closed and target in place, then the lathe resumes normal operating.

A control method of a safety detection control system of a numerically controlled milling machine comprises the following steps: when the machine tool finishes running and the numerical control module sends a stop instruction, the servo drive stops outputting voltage to the spindle motor, but the spindle motor continues to rotate in the same direction due to inertia, so that the spindle motor continues to run under the working condition of a generator and feeds power to the servo drive, and as long as the rotating speed of the spindle motor is not zero, the voltage of the output end of the servo drive is not zero; at the moment, a voltage detection circuit of the zero-speed detection relay can detect whether the voltage difference of the output voltage end of the servo drive is zero or not, when the voltage of the output end of the servo drive is detected to be zero, the zero-speed detection relay controls the coil to be electrified, and the normally open contact controlled by the control coil is closed. At this moment, press the button of opening the door and send input signal to IO unit that opens the door, IO unit will open the door input signal and send to relay module, relay module's control coil circular telegram, relay module's normally open contact is closed to make the coil circular telegram of emergency exit switch, the bolt of emergency exit switch can be extracted, and the emergency exit can be opened.

The invention has the beneficial effects that: when the numerical control module sends a stop instruction, the servo drive stops outputting voltage to the spindle motor, but the spindle motor can continue to rotate in the same direction due to inertia, so that the spindle motor continues to operate under the working condition of a generator and feeds power to the servo drive, as long as the rotating speed of the spindle motor is not zero, the voltage of the output end of the servo drive is not zero, so that when the spindle motor rotates, the safety door switch cannot be normally opened, when the rotating speed of the spindle motor is zero, the output voltage of the servo drive is zero, and at the moment, the safety door switch can be normally opened, so that the problem that when the spindle of the machine tool rotates, a safety door is opened, workpieces or iron blocks can be thrown out of the safety door, and casualties are caused can be effectively solved, and when the safety door is opened, the spindle motor cannot normally operate, so that the safety door is prevented from being opened, after the personnel enter the safety door, the equipment operates to cause casualties to the personnel, and the invention greatly improves the safety of the numerical control milling machine in the production operation process.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic block diagram of a safety detection control system of a numerically controlled milling machine.

Detailed Description

As shown in fig. 1, a safety detection control system of a numerically controlled milling machine comprises a door opening button, a zero-speed detection relay, a safety door switch, a servo drive, a spindle motor, a numerical control module, an IO module and a relay module;

the door opening button is used for generating a door opening input signal and is electrically connected with the IO module; the IO module is connected with the relay module and the numerical control module, the IO module is used for sending a control signal of the numerical control module and a door opening input signal of the door opening button into the relay module, and the relay module is used for converting the control signal and the door opening input signal; the relay module is connected with a zero-speed detection relay, the zero-speed detection relay is used for detecting the running state of the safety protection equipment and generating a door opening input signal, and the zero-speed detection relay is electrically connected with the safety door switch;

the safety door switch comprises an electromagnetic valve and a bolt device controlled by the electromagnetic valve, a normally open contact and a normally closed contact are arranged between the electromagnetic valve and the bolt device, the safety door electromagnetic valve is electrified, the bolt device can be pulled out, the normally open contact is closed, and the normally closed contact is opened;

the numerical control module is connected with a servo drive, and the servo drive is respectively connected with a spindle motor and a zero-speed detection relay; it needs to be further explained that the numerical control module is connected with the servo drive through an optical cable, and the spindle motor is connected with the servo drive through a power line and an encoder line;

the detection process of the running state of the zero-speed detection relay safety protection equipment comprises the following steps:

step L1: a voltage detection circuit is arranged in the zero-speed detection relay;

step L2: acquiring three-phase output voltage of a spindle motor;

step L3: when the three-phase output voltage of the spindle motor is not 0, intercepting and invalidating a door opening input signal; when the three-phase output voltage of the spindle motor is 0, a door opening output signal is sent to the safety door switch; the model of the zero-speed relay is XPSVNE 1142P.

The spindle motor is provided with a power generation coil, and it needs to be further explained that when the machine tool finishes running and the numerical control module sends a stop instruction, the servo drive stops outputting voltage to the spindle motor, but the spindle motor continues to rotate in the same direction due to inertia, so that the spindle motor continues to run under the working condition of the power generator and feeds power to the servo drive, and as long as the rotating speed of the spindle motor is not zero, the voltage of the output end of the servo drive is not zero;

in the specific implementation process, it needs to be further explained that after the safety door switch receives the door opening output signal, the normally open contact in the safety door switch is closed, so that the electromagnetic valve is electrified, and the bolt device can be pulled out from the safety door switch;

the safety door switch is installed on the safety door, and in the specific implementation process, it needs to be further explained that when the safety door is in an open state, a normally closed contact in the safety door switch is disconnected, and a door closing in-place signal transmitted to the numerical control module through the relay module and the IO module is disconnected, so that a machine tool cannot run, and when the safety door is closed in place, the machine tool returns to normal running.

The working principle is as follows: when the machine tool finishes running and the numerical control module sends a stop instruction, the servo drive stops outputting voltage to the spindle motor, but the spindle motor continues to rotate in the same direction due to inertia, so that the spindle motor continues to run under the working condition of a generator and feeds power to the servo drive, and as long as the rotating speed of the spindle motor is not zero, the voltage of the output end of the servo drive is not zero; at the moment, a voltage detection circuit of the zero-speed detection relay can detect whether the voltage difference of the output voltage end of the servo drive is zero or not, when the voltage of the output end of the servo drive is detected to be zero, the zero-speed detection relay controls the coil to be electrified, and the normally open contact controlled by the control coil is closed. At this moment, press the button of opening the door and send input signal to IO unit that opens the door, IO unit will open the door input signal and send to relay module, relay module's control coil circular telegram, relay module's normally open contact is closed to make the coil circular telegram of emergency exit switch, the bolt of emergency exit switch can be extracted, and the emergency exit can be opened.

Under the condition that the emergency exit is opened, the emergency exit switch normally closed contact breaks off, and the signal disconnection that targets in place of closing the door that passes to numerical control module through relay module, IO module, the lathe can't move, and when the emergency exit closed, the lathe just can normal operating.

In the embodiments provided by the present invention, it should be understood that the disclosed apparatus, device and method can be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is only one logical functional division, and there may be other divisions when the actual implementation is performed; the modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the method of the embodiment.

Finally, it should be noted that the above examples are only intended to illustrate the technical process of the present invention and not to limit the same, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical process of the present invention without departing from the spirit and scope of the technical process of the present invention.