阅读说明：本技术 一种防触电电焊机 (Electric shock prevention electric welding machine ) 是由 周裕辉 于 2021-09-16 设计创作，主要内容包括：本发明提供一种防触电电焊机,包括：壳体、以及设置在壳体内的电源模块、输出模块和第一控制模块,还包括：监测模块,用于监测输出模块的电流并生成电流数据；处理模块,用于解析电流数据,确定电源调控策略；第二控制模块,用于基于电源调控策略,控制电源模块的输出。本发明的防触电电焊机,通过对电焊机的输出的电流进行分析,进而确定对应的电源调控策略,对电源模块进行输出调控,降低使用电焊机的触电风险,提高了使用电焊机的安全性。(The invention provides an electric shock prevention electric welding machine, comprising: casing and power module, output module and the first control module of setting in the casing still include: the monitoring module is used for monitoring the current of the output module and generating current data; the processing module is used for analyzing the current data and determining a power supply regulation and control strategy; and the second control module is used for controlling the output of the power supply module based on the power supply regulation and control strategy. According to the electric shock prevention electric welding machine, the output current of the electric welding machine is analyzed, so that the corresponding power supply regulation strategy is determined, the output regulation of the power supply module is performed, the electric shock risk of using the electric welding machine is reduced, and the safety of using the electric welding machine is improved.)

1. An electric shock protection welding machine, comprising: casing and setting are in power module, output module and first control module in the casing, its characterized in that still includes:

the monitoring module is used for monitoring the current of the output module and generating current data;

the processing module is used for analyzing the current data and determining a power supply regulation and control strategy;

and the second control module is used for controlling the output of the power supply module based on the power supply regulation and control strategy.

2. The electric shock protection welder of claim 1, wherein the output module comprises:

and the positive terminal and the negative terminal are symmetrically arranged on the front surface of the shell.

3. The electric shock protection welder of claim 2, wherein the first control module comprises: and the control switch is arranged on the front surface of the shell and used for controlling the on-off of the currents on the positive terminal and the negative terminal.

4. The electric shock protection welder of claim 3, wherein the power module comprises:

the power line interface is arranged on the back surface of the shell;

and the rectifier is arranged in the shell, is electrically connected with the power line interface and is used for converting commercial power into direct current.

5. The electric shock protection welder of claim 1, wherein the processing module parses the current data to determine a power regulation strategy comprising:

performing feature extraction on the current data to obtain a plurality of feature values;

inputting the characteristic value into a preset neural network model to obtain a regulation factor;

inquiring a preset regulation strategy table based on the regulation factor to obtain the power supply regulation strategy;

and the regulation factors in the regulation strategy table are in one-to-one correspondence with the power supply regulation strategies.

6. The electric shock protection welder of claim 1, wherein the processing module parses the current data to determine a power regulation strategy comprising:

analyzing the current data to determine the current value;

when the current value is zero, controlling the voltage output by the power supply module to be a preset safe voltage;

and/or the presence of a gas in the gas,

analyzing the current data, and determining a current difference value between the current value and the current value of the last sampling time point;

when the current difference value is greater than or equal to a preset first threshold value and smaller than a preset second threshold value, cutting off the output of the power output module;

and/or the presence of a gas in the gas,

and when the current value is larger than a preset current threshold value, controlling the voltage output by the power supply module to be a preset working voltage.

7. The electric shock protection welder of claim 1, further comprising:

the image acquisition module is arranged at the upper part of the shell, is electrically connected with the processing module and is used for acquiring an environment picture of the environment where the electric welding machine is located;

the processing module further performs the following operations:

analyzing the environment picture to determine whether a worker is around;

and starting timing when no staff exists around, and cutting off the output of the power supply output module when the timing reaches a preset first time and no staff enters the environment around the electric welding machine in the timed period.

8. The electric shock protection welder of claim 7, wherein the processing module performs parsing the environmental picture to determine if there is a worker around, comprising:

extracting a contour library in the environment picture to obtain a contour to be confirmed;

acquiring a preset human body contour recognition library;

matching the contour to be confirmed with the standard contour in the human body contour recognition library one by one;

when the standard contour matched and matched with the contour to be confirmed does not exist in the human body contour recognition library, no staff exists around the electric welding machine;

when a matching coincidence item exists, acquiring image data in the contour to be confirmed, which is matched with the standard contour;

acquiring a preset staff identification library;

performing feature extraction on the image data to obtain a plurality of second feature values;

constructing a first identification vector based on the second feature value;

matching with each second identification vector in the staff identification library based on the first identification vector;

when the second identification vector matched with the first identification vector does not exist in the worker identification library, workers do not exist around the electric welding machine;

when the second identification vector matched with the first identification vector exists in the worker identification library, workers exist around the electric welding machine.

9. The electric shock protection welder of claim 7, wherein the processing module further performs the following operations:

when the electric welding machine is started and workers exist around the electric welding machine, acquiring images of the workers;

determining whether the image of the worker is a front image or a back image based on the image;

when the image of the worker is a back image, timing is started, and when a preset second time passes and the image is always the back image in the second time, the output of the power supply output module is cut off;

when the image of the worker is a front image, carrying out contour recognition on the image of the worker, and determining the position of the contour of the hand;

extracting an image containing a human hand based on the hand contour position;

judging whether the worker violates the operation or not based on the image of the hand of the human body;

when illegal operation exists, the output of the power supply output module is cut off;

and/or

Judging whether the worker performs electric welding operation or not based on the image of the hand of the human body;

when the worker does not perform electric welding operation, controlling the voltage output by the power supply module to be a preset safe voltage;

when the worker performs electric welding operation, the voltage output by the power supply module is controlled to be a preset working voltage;

wherein, the image based on the human hand is used for judging whether the staff violates the operation, and the method comprises the following steps:

acquiring a preset violation image library;

matching the image of the hand of the human body with the violation image in the violation image library, and determining that the worker has violation operation when a matching coincidence item exists; when the matching coincidence item does not exist, determining that the illegal operation does not exist for the staff;

judging whether the worker performs electric welding operation or not based on the image of the hand of the human body; the method comprises the following steps:

acquiring a preset operation image library;

matching the image of the human hand with an operation image in the operation image library; when the matching item exists, determining that the worker is performing electric welding operation; and when the matching coincidence item does not exist, determining that the worker does not perform electric welding operation.

10. The electric shock protection welder of claim 9, wherein the processing module further performs the following operations:

when the image of the worker is a front image, carrying out contour recognition on the image of the worker to determine the position of the face contour;

extracting an image containing a human face based on the face contour position;

judging whether the electric shock risk exists or not based on the image of the human face;

when the electric shock risk exists, the output of the power output module is cut off;

wherein, based on the image of human face, judge whether there is the risk of electrocution, include:

acquiring a preset electric shock risk assessment library, wherein risk images in the electric shock risk assessment library are in one-to-one correspondence with assessment values;

matching the images of the human face with the risk images in the electric shock risk assessment library one by one; acquiring the evaluation value corresponding to the risk image matched with the risk image;

and when the evaluation value is larger than a preset evaluation threshold value, determining that the electric shock risk exists.

Technical Field

The invention relates to the technical field of electric shock prevention, in particular to an electric shock prevention electric welding machine.

Background

At present, the welding machine uses the high-temperature electric arc generated when the positive and negative poles are short-circuited instantaneously to melt the welding flux and the welded material on the welding rod. Because the instantaneous high-voltage electric arc is generated during short circuit, the working voltage of the electric welding machine is higher, the working environment is relatively complex, the operation of a user is possibly not standardized, and the factors such as the use of the electric welding machine cause higher potential safety hazard, particularly the potential electric shock hazard, and the common electric welding machine is generally more than 60V at no-load voltage and is far higher than the safety standard.

Disclosure of Invention

One of the purposes of the invention is to provide an electric shock prevention electric welding machine, which analyzes the output current of the electric welding machine, further determines a corresponding power supply regulation and control strategy, and performs output regulation and control on a power supply module, thereby reducing the electric shock risk of using the electric welding machine and improving the safety of using the electric welding machine.

The embodiment of the invention provides an electric shock prevention electric welding machine, which comprises: casing and power module, output module and the first control module of setting in the casing still include:

the monitoring module is used for monitoring the current of the output module and generating current data;

the processing module is used for analyzing the current data and determining a power supply regulation and control strategy;

and the second control module is used for controlling the output of the power supply module based on the power supply regulation and control strategy.

Preferably, the output module includes:

the positive terminal and the negative terminal are symmetrically arranged on the front surface of the shell.

Preferably, the first control module includes: and the control switch is arranged on the front surface of the shell and used for controlling the on-off of the current on the positive terminal and the negative terminal.

Preferably, the power supply module includes:

the power line interface is arranged on the back of the shell;

and the rectifier is arranged in the shell, is electrically connected with the power line interface and is used for converting commercial power into direct current.

Preferably, the processing module analyzes the current data to determine a power regulation strategy, and the method includes:

performing feature extraction on the current data to obtain a plurality of feature values;

inputting the characteristic value into a preset neural network model to obtain a regulation factor;

inquiring a preset regulation strategy table based on the regulation factor to obtain a power supply regulation strategy;

and the regulation factors in the regulation strategy table are in one-to-one correspondence with the power supply regulation strategies.

Preferably, the processing module analyzes the current data to determine a power regulation strategy, and the method includes:

analyzing the current data and determining the current value;

when the current value is zero, controlling the voltage output by the power supply module to be a preset safe voltage;

and/or the presence of a gas in the gas,

analyzing the current data, and determining a current difference value between the current value and the current value of the last sampling time point;

when the current difference value is greater than or equal to a preset first threshold value and smaller than a preset second threshold value, the output of the power output module is cut off;

and/or the presence of a gas in the gas,

and when the current value is larger than the preset current threshold value, controlling the voltage output by the power supply module to be the preset working voltage.

Preferably, protection against electric shock electric welding still includes:

the image acquisition module is arranged at the upper part of the shell, is electrically connected with the processing module and is used for acquiring an environment picture of the environment where the electric welding machine is located;

the processing module further performs the following operations:

analyzing the environment picture, and determining whether a worker is around;

and starting timing when no staff exists around, and cutting off the output of the power output module when the timing reaches a preset first time and no staff enters the environment around the electric welding machine in the timed period.

Preferably, the processing module executes the parsing environment picture to determine whether there is a worker around, including:

extracting a contour library in the environment picture to obtain a contour to be confirmed;

acquiring a preset human body contour recognition library;

matching the contours to be confirmed with standard contours in a human body contour recognition library one by one;

when the standard contour matched and matched with the contour to be confirmed does not exist in the human body contour recognition library, no staff exists around the electric welding machine;

when the matching coincidence item exists, acquiring image data in the contour to be confirmed, which is matched with the standard contour;

acquiring a preset staff identification library;

performing feature extraction on the image data to obtain a plurality of second feature values;

constructing a first identification vector based on the second characteristic value;

matching with each second identification vector in the staff identification library based on the first identification vector;

when the second identification vector matched with the first identification vector does not exist in the worker identification library, workers do not exist around the electric welding machine;

when a second identification vector matched with the first identification vector exists in the worker identification library, workers exist around the electric welding machine.

Preferably, the processing module further performs the following operations:

when the electric welding machine is started and workers exist around the electric welding machine, acquiring images of the workers;

determining whether the image of the worker is a front image or a back image based on the image;

when the image of the staff is the back image, timing is started, and when the preset second time passes and the image is the back image all the time in the second time, the output of the power output module is cut off;

when the image of the worker is a front image, carrying out contour recognition on the image of the worker, and determining the position of the contour of the hand;

extracting an image containing a human hand based on the hand contour position;

judging whether the worker violates the operation or not based on the image of the hand of the human body;

when illegal operation exists, the output of the power output module is cut off;

and/or

Judging whether a worker performs electric welding operation or not based on the image of the hand of the human body;

when the electric welding operation is not carried out by a worker, the voltage output by the power supply module is controlled to be a preset safe voltage;

when a worker performs electric welding operation, the voltage output by the power supply module is controlled to be a preset working voltage;

wherein, based on the image of human hand, judge whether the staff violates rules and regulations, include:

acquiring a preset violation image library;

matching the image of the hand of the human body with the violation image in the violation image library, and determining that the worker has violation operation when a matching coincidence item exists; when the matching coincidence item does not exist, determining that the illegal operation does not exist for the staff;

judging whether a worker performs electric welding operation or not based on the image of the hand of the human body; the method comprises the following steps:

acquiring a preset operation image library;

matching the image of the hand of the human body with the operation image in the operation image library; when the matching item exists, determining that the worker is performing electric welding operation; and when the matching item does not exist, determining that the worker does not perform electric welding operation.

Preferably, the processing module further performs the following operations:

when the image of the worker is a front image, carrying out contour recognition on the image of the worker to determine the position of the face contour;

extracting an image containing a human face based on the face contour position;

judging whether the electric shock risk exists or not based on the image of the human face;

when the electric shock risk exists, the output of the power output module is cut off;

wherein, based on the image of human face, judge whether there is the risk of electrocution, include:

acquiring a preset electric shock risk assessment library, wherein risk images in the electric shock risk assessment library are in one-to-one correspondence with assessment values;

matching the images of the human face with the risk images in the electric shock risk assessment library one by one; acquiring an evaluation value corresponding to the risk image matched with the risk image;

and when the evaluation value is larger than a preset evaluation threshold value, determining that the electric shock risk exists.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic diagram of an electric shock protection welding machine according to an embodiment of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

The embodiment of the invention provides an electric shock prevention electric welding machine, as shown in figure 1, comprising: casing 1, and power module 11, output module 12 and the first control module 13 of setting in casing 1 still include:

a monitoring module 16 for monitoring the current of the output module 12 and generating current data;

the processing module 15 is used for analyzing the current data and determining a power supply regulation and control strategy;

and the second control module 14 is used for controlling the output of the power supply module 11 based on the power supply regulation and control strategy.

The working principle and the beneficial effects of the technical scheme are as follows:

the power module 11 mainly functions to convert the commercial power or the industrial three-phase power into the direct current used by the electrode holders, and is essentially a transformer; the output module 12 is a switching device which is used as an electrode holder and is connected to the power supply module 11; the first control module 13 mainly controls the on-off of the output module 12, the output voltage and the like; the processing module 15 monitors the current of the output module 12 through the monitoring module 16, and determines a power supply regulation and control strategy according to the monitored current data; for example: when the power data is abnormal, operations such as turning off the output of the power module 11 or reducing the output voltage of the power module 11 are performed. Through the power regulation and control strategy, reduce staff's the risk of electrocution, improve the security that the electric welding used.

In one embodiment, the output module 12 includes:

and the positive terminal and the negative terminal are symmetrically arranged on the front surface of the shell 1.

The working principle and the beneficial effects of the technical scheme are as follows:

the positive terminal and the negative terminal are used for connecting electric welding tongs; in order to increase the safety factor, furthermore, a pressure sensor can be arranged in the binding post and used for detecting the wiring action of the electrode holders; further determining whether to turn on the power module 11; the action that the welding electrode holders are connected in by the working personnel when the wiring terminal is electrified is prevented. Before the electrode holders are not connected, the pressure value detected by the pressure sensor is zero, and the power module 11 does not output outwards at the moment; when the electric welding pliers are connected, the pressure sensor detects a pressure value, and the power module 11 outputs the pressure value outwards after a preset waiting time; the risk of contact takes place through the terminal when avoiding the welding tongs to insert, guarantees the security that the electric welding used.

In one embodiment, the first control module 13 includes: and the control switch is arranged on the front surface of the shell 1 and used for controlling the on-off of the current on the positive terminal and the negative terminal.

The working principle and the beneficial effects of the technical scheme are as follows:

the specific control mode of the control switch is selected according to the actual situation, and a knob control switch or a key control switch can be selected; the control switch mainly controls the on-off of the outward output of the output template.

In one embodiment, the power module 11 includes:

the power line interface is arranged on the back of the shell 1;

and the rectifier is arranged in the shell 1, is electrically connected with the power line interface and is used for converting commercial power into direct current.

The working principle and the beneficial effects of the technical scheme are as follows:

the rectifier is a device for converting alternating current into direct current; converting an alternating current point for daily use or industrial use into direct current through a rectifier; the rectifier with controllable output can be selected, and then the regulation and control of the output voltage are realized. Further, the second control module 14 includes: the adjustable series voltage-dividing circuit is characterized in that an electric control adjustable resistor and a voltage-dividing resistor are arranged on the circuit; the output module 12 is parallel to the divider resistor or the electric control adjustable resistor; when the resistance of the electrically controlled adjustable resistor changes, the output voltage of the output module 12 changes accordingly; the processing module controls the resistance change of the electric control adjustable resistor to complete the implementation of the power supply regulation and control strategy.

In one embodiment, the processing module 15 parses the current data to determine a power regulation strategy, including:

performing feature extraction on the current data to obtain a plurality of feature values;

inputting the characteristic value into a preset neural network model to obtain a regulation factor;

inquiring a preset regulation strategy table based on the regulation factor to obtain a power supply regulation strategy;

and the regulation factors in the regulation strategy table are in one-to-one correspondence with the power supply regulation strategies.

The working principle and the beneficial effects of the technical scheme are as follows:

comprehensively analyzing the current data through a preset neural network model to determine whether the current is abnormal; when abnormality occurs, determining to select a corresponding power supply regulation strategy; for example: the characteristic values include: current fluctuation value, current fluctuation frequency, maximum current difference value, current value and the like; the current fluctuation value is the difference between two adjacent currents; the current fluctuation frequency is the current fluctuation times in unit time; the maximum current difference is the difference between the maximum current value and the minimum current value in the current data. For example, when the current value in the current fluctuation value is always kept to be zero, the fluctuation value is zero, and the current fluctuation frequency is zero, the output of the power module 11 is turned off or the voltage of the output of the power module 11 is reduced to a preset safe voltage (for example, 24V); when the current fluctuation frequency exceeds the maximum fluctuation threshold, the output of the power module 11 is turned off.

In one embodiment, the processing module 15 parses the current data to determine a power regulation strategy, including:

analyzing the current data and determining the current value;

when the current value is zero, controlling the voltage output by the power module 11 to be a preset safe voltage;

and/or the presence of a gas in the gas,

analyzing the current data, and determining a current difference value between the current value and the current value of the last sampling time point;

when the current difference is greater than or equal to a preset first threshold and smaller than a preset second threshold, the output of the power output module 12 is cut off;

and/or the presence of a gas in the gas,

when the current value is greater than the preset current threshold, the voltage output by the power module 11 is controlled to be the preset working voltage.

The working principle and the beneficial effects of the technical scheme are as follows:

the processing module 15 analyzes the current data to determine the current working state of the welding machine, for example, when the current value is zero, which indicates that the electrode holders are not used or in a no-load state, the output voltage can be set to be a safe voltage to reduce the risk of electric shock of the workers, and further, a time factor judgment is added to deal with the middle gap time of the workers by setting a time threshold. Analyzing the current data, and determining a current difference value between the current value and the current value of the last sampling time point; when the current difference is greater than or equal to a preset first threshold and smaller than a preset second threshold, the output of the power output module 12 is cut off; the corresponding situation is touched by a human body after the voltage is reduced to the safe voltage, and the resistance of the human body is far greater than that of the electric solder; so that the current after the human body is accessed is far less than the current accessed by the electric welding material; the first threshold value can be set to be half of the current value when the human body average resistance (obtained by averaging a large amount of human body resistance detection data) is connected to the safe voltage; the second threshold is set to be half of the current value (obtained by averaging the current values under a large number of electric welding material access experiments) when the electric welding material is accessed to the safe voltage; whether the current falls between the first threshold value and the second threshold value or not is detected, whether the human body is touched by mistake or not is further judged, and when the human body is touched by mistake, the output of the power output module 12 is cut off. When the current value is larger than a preset current threshold value, controlling the voltage output by the power supply module 11 to be a preset working voltage, and judging the current of the incoming solder under the safety voltage; the current threshold value can be obtained by adopting a residual preset coefficient after averaging the current obtained by counting a large amount of electric welding materials; the preset coefficient can be 0.9, which indicates that the worker needs to perform electric welding operation, and the output voltage of the power module 11 needs to be set as the working voltage, so as to realize the normal operation of electric welding operation.

In one embodiment, protection against electric shock electric welding still includes:

the image acquisition module is arranged at the upper part of the shell 1, is electrically connected with the processing module 15 and is used for acquiring an environment picture of the environment where the electric welding machine is located;

the processing module 15 also performs the following operations:

analyzing the environment picture, and determining whether a worker is around;

the timing is started when no staff exists around the welding machine, and the output of the power output module 12 is cut off when the timing reaches the preset first time and no staff enters the environment around the welding machine in the timing period.

The working principle and the beneficial effects of the technical scheme are as follows:

the image acquisition module is used for acquiring the environmental picture used by the electric welding machine, so that the use situation is determined, the output of the power output module 12 is adjusted, and the safety is improved; analyzing the environment picture, and determining whether a worker is around; starting timing when no staff exists around, and when the timing reaches a preset first time and no staff enters the environment around the electric welding machine within the timing period; at the moment, after the work of the worker is finished, the electric welding machine is forgotten to be turned off, and the situation is judged through the image acquisition module to realize intelligent turn-off; prevent other creatures, such as pet dogs, from being touched by mistake to cause electric shock accidents.

In one embodiment, the processing module 15 executes the parsing environment picture to determine whether there is a worker around, including:

extracting a contour library in the environment picture to obtain a contour to be confirmed;

acquiring a preset human body contour recognition library;

matching the contours to be confirmed with standard contours in a human body contour recognition library one by one;

when the standard contour matched and matched with the contour to be confirmed does not exist in the human body contour recognition library, no staff exists around the electric welding machine;

when the matching coincidence item exists, acquiring image data in the contour to be confirmed, which is matched with the standard contour;

acquiring a preset staff identification library;

performing feature extraction on the image data to obtain a plurality of second feature values;

constructing a first identification vector based on the second characteristic value;

matching with each second identification vector in the staff identification library based on the first identification vector;

when the second identification vector matched with the first identification vector does not exist in the worker identification library, workers do not exist around the electric welding machine;

when a second identification vector matched with the first identification vector exists in the worker identification library, workers exist around the electric welding machine.

The working principle and the beneficial effects of the technical scheme are as follows:

identifying the staff by two steps, namely identifying the contour of a first part, identifying whether the periphery has the human body contour or not, and identifying the identified human body contour by the second step; for example, the identification is carried out through the ratio of colors in the outline of the human body, the clothes of workers are uniformly blue and white, the set ratio threshold values are 70% and 20%, and at the moment, each parameter of the first identification vector in the outline is the ratio of each color; whether the staff is determined by the ratio. Through two-step identification, the operation amount is reduced; namely, when the contour identification is not passed, the identification by workers is not needed. During recognition, the contour to be confirmed is matched with the standard contour in the human body contour recognition library one by one; or matching based on the first identification vector and each second identification vector in the staff identification library; the matching can be carried out by adopting a similarity calculation method; for example, the similarity between the data of the contour to be confirmed and the standard contour data is calculated through cosine similarity, and when the similarity is greater than a preset similarity threshold and is the maximum similarity in the human body contour recognition library, the contour to be confirmed is determined to be matched with the standard contour. The cosine similarity calculation formula is as follows:

wherein K represents similarity; ai is the ith parameter value of the object to be matched; bi is the ith parameter value in the standard object; n is the total number of parameters.

In one embodiment, the processing module 15 further performs the following operations:

when the electric welding machine is started and workers exist around the electric welding machine, acquiring images of the workers;

determining whether the image of the worker is a front image or a back image based on the image;

when the image of the staff is the back image, timing is started, and when the preset second time passes and the image is the back image all the time in the second time, the output of the power output module 12 is cut off;

when the image of the worker is a front image, carrying out contour recognition on the image of the worker, and determining the position of the contour of the hand;

extracting an image containing a human hand based on the hand contour position;

judging whether the worker violates the operation or not based on the image of the hand of the human body;

when there is an illegal operation, the output of the power output module 12 is cut off;

and/or

Judging whether a worker performs electric welding operation or not based on the image of the hand of the human body;

when the electric welding operation is not performed by the worker, the voltage output by the power supply module 11 is controlled to be a preset safe voltage;

when a worker performs electric welding operation, the voltage output by the power supply module 11 is controlled to be a preset working voltage;

wherein, based on the image of human hand, judge whether the staff violates rules and regulations, include:

acquiring a preset violation image library;

matching the image of the hand of the human body with the violation image in the violation image library, and determining that the worker has violation operation when a matching coincidence item exists; when the matching coincidence item does not exist, determining that the illegal operation does not exist for the staff;

judging whether a worker performs electric welding operation or not based on the image of the hand of the human body; the method comprises the following steps:

acquiring a preset operation image library;

matching the image of the hand of the human body with the operation image in the operation image library; when the matching item exists, determining that the worker is performing electric welding operation; and when the matching item does not exist, determining that the worker does not perform electric welding operation.

Wherein, the processing module 15 further executes the following operations:

when the image of the worker is a front image, carrying out contour recognition on the image of the worker to determine the position of the face contour;

extracting an image containing a human face based on the face contour position;

judging whether the electric shock risk exists or not based on the image of the human face;

when the electric shock risk exists, the output of the power output module 12 is cut off;

wherein, based on the image of human face, judge whether there is the risk of electrocution, include:

acquiring a preset electric shock risk assessment library, wherein risk images in the electric shock risk assessment library are in one-to-one correspondence with assessment values;

matching the images of the human face with the risk images in the electric shock risk assessment library one by one; acquiring an evaluation value corresponding to the risk image matched with the risk image;

and when the evaluation value is larger than a preset evaluation threshold value, determining that the electric shock risk exists.

The working principle and the beneficial effects of the technical scheme are as follows:

monitoring the state and operation of the worker through the hand image and the face image; when illegal operation exists, for example, working gloves are not worn, other objects influencing welding are held on the hands during welding, workers are in a state of getting stranded, welding spots are gathered at the nose tip and at the chin, the abnormal states belong to abnormal states, electric shock hazards exist, and the output of the power module 11 needs to be stopped or reduced to safe voltage output. Wherein, the risk is evaluated through a contact risk evaluation library during the face recognition; for example: when the worker is in trouble, the worker does not close eyes and nods heads; when within an hour, the person has only proceeded once, the risk value is 50; when within one minute, the person has proceeded once, with a risk value of 100; when the sweat drops only gather at the tip of the nose and do not drop, the risk value is 50; the risk value when a sweat droplet drips from the tip of the nose is 100.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.