CN-121715653-B - Automatic loose clamping electrode holders based on temperature judgment of clamping area

CN121715653BCN 121715653 BCN121715653 BCN 121715653BCN-121715653-B

Abstract

The invention belongs to the technical field of electric welding equipment, and particularly relates to an automatic loose clamping electrode holder based on temperature judgment of a clamping area. The welding rod automatic loosening device comprises a clamp body, a clamping bent handle, a clamping jaw, a clamping spring used for providing clamping force, a temperature sensor, a control mechanism and an electromagnetic driving assembly, wherein the temperature sensor is arranged in the clamping jaw, the control mechanism and the electromagnetic driving assembly are arranged on the clamping bent handle, the temperature sensor, the control mechanism and the electromagnetic driving assembly are electrically connected through a wire, and the control mechanism is used for enabling the clamping spring to lose acting force on the clamping jaw through the electromagnetic driving assembly based on temperature signals acquired by the temperature sensor, so that welding rods can be automatically loosened. According to the invention, the temperature signal is collected in real time in the clamping area of the electrode holder, and comprehensive judgment is carried out by combining with the preset minimum fault duration, and the action of the loosening mechanism is driven only when the dangerous welding rod adhesion fault is confirmed, so that the safe and reliable protection of welding is realized while false triggering is avoided.

Inventors

ZHOU RIXIN
WANG HAORAN

Assignees

东北大学

Dates

Publication Date: 20260508
Application Date: 20260225

Claims (6)

1. The automatic loosening and clamping electrode holder based on the temperature judgment of the clamping area comprises a holder body, a clamping bent handle, a clamping jaw and a clamping spring for providing clamping force, and is characterized by further comprising a temperature sensor, a control mechanism and an electromagnetic driving assembly, wherein the temperature sensor is arranged in the clamping jaw, the control mechanism and the electromagnetic driving assembly are arranged on the clamping bent handle, and the temperature sensor, the control mechanism and the electromagnetic driving assembly are electrically connected through a wire; A pincer-shaped structure is formed between the pincer body and the clamping bent handle, and the clamping jaw is fixedly arranged at the front end of the clamping bent handle; the middle part of the clamping bent handle is provided with a through hole, the lower end of the clamping spring is placed in the spring fixing barrel, the upper end of the clamping spring is placed in the through hole, and the upper end of the clamping spring is controlled by an electromagnetic driving assembly; The electromagnetic driving assembly comprises an electromagnetic coil and an electromagnetic iron core, the electromagnetic coil is integrated in the clamping bent handle and is positioned beside the through hole, the electromagnetic iron core is controlled by the electromagnetic coil, and the electromagnetic iron core protrudes out of the electromagnetic coil and is positioned above the through hole for clamping the upper end of the clamping spring; The control mechanism comprises a controller and a power supply module, wherein the controller and the power supply module are arranged at the tail part of the clamping bent handle; The controller adopts a singlechip, the input end of the controller is connected with a signal amplifying module and a filtering module, the output signal of the temperature sensor is amplified by the signal amplifying module and filtered by the filtering module and then transmitted to the controller, a processor and a program storage unit are configured in the controller, a control program for executing welding rod adhesion judgment is stored in the program storage unit, a fault continuous counter is arranged in the control program, and the controller is provided with a display screen and a parameter setting module.
2. The automatic loosening and clamping electrode holders based on temperature determination of a clamping area according to claim 1, wherein a delay module is integrated in the controller, when the controller controls the electromagnetic coil to be electrified, the delay module starts timing, and when a preset delay time is reached, the controller controls the electromagnetic coil to be automatically powered off.
3. The automatic loose-clamping electrode holder based on clamping area temperature determination according to claim 1, wherein the power supply module adopts a rechargeable lithium battery and is used for supplying power to the controller and the electromagnetic coil.
4. The automatic loose-clamping electrode holders based on temperature determination of clamping areas according to claim 1, wherein the temperature sensor is a high-temperature-resistant thermocouple sensor, the detection end of the temperature-resistant thermocouple sensor is attached to the inner clamping surface of the clamping jaw, and the outer side of the temperature-resistant thermocouple sensor is coated with an insulating high-temperature-resistant protective layer.
5. The automatic loose-clamping electrode holder based on the temperature determination of the clamping area according to claim 1, wherein a spanner is arranged on the spring fixing cylinder.
6. The automatic pinch-release welding electrode holder based on temperature determination of a clamping area according to claim 1, wherein the implementation process of the control program comprises the steps of: 1) Initializing parameter setting, namely inputting welding parameters, namely welding current, through a display screen and a parameter setting module Diameter of welding rod Minimum failure duration And set the sampling period Time delay of power-off of electromagnetic coil Continuous fault counter Zero clearing; 2) Calculating a self-adaptive temperature threshold and a sampling frequency threshold; calculating an adaptive temperature threshold according to equation (1) ; (1) In the formula, Is an adaptive temperature threshold, the value of which is based on welding current And electrode diameter Dynamically determining; is the temperature reference threshold, expressed in reference current And reference diameter A fixed temperature value is set at the lower part of the temperature sensor, The current compensation coefficient is expressed as the unit of the temperature/A; the unit is the temperature/mm for the diameter compensation coefficient; for a set current corresponding to the diameter of the electrode, in a, The unit is mm for the actual welding rod diameter; To avoid transient disturbances, a minimum fault duration is introduced And calculating based on formula (2) Corresponding sampling times threshold ; (2) In the formula, Is the minimum fault duration; 3) Signal acquisition and pretreatment; the controller is in fixed period Sampling the temperature signal, and then ( ) At the sub-sampling moment, the effective temperature value obtained after the original signal output by the temperature sensor is processed by the signal amplifying module and the filtering module is recorded as Unit of °c; 4) Judging instantaneous faults and updating a counter; sampling the processed temperature based on formula (1) And adaptive threshold Comparing to generate instantaneous fault sign at current sampling time ; (3) Based on transient fault signs Updating a fault duration counter Namely when When it is true, the fault continues to count Accumulating the number of faults, i.e. If (1) When it is false, the fault duration counter is reset, i.e And returning to the step 3) to continue monitoring, as shown in the formula (4); (4); 5) Continuously judging faults; While in continuous Transient fault flags in subsampling If the continuous value is true, the actual fault is finally judged, the step 6) is entered, otherwise, the fault continuous counter is used Keeping the current value unchanged, and returning to the step 3) to continue monitoring, as shown in a formula (5); (5) in the formula, Final fault judgment result at kth sampling time, wherein the value is 1 or 0; 6) Immediately clearing fault continuous counter by controller And driving the electromagnetic actuator to automatically loosen the welding rod, and starting the timer to reach the preset time After that, the electromagnetic coil is deenergized.

Description

Automatic loose clamping electrode holders based on temperature judgment of clamping area Technical Field The invention belongs to the technical field of electric welding equipment, and particularly relates to an automatic loose clamping electrode holder based on temperature judgment of a clamping area. Background Manual arc welding is a welding mode which is widely applied in the fields of industrial manufacture, equipment installation and maintenance, and the welding rod is clamped by an electric welding clamp, so that an electric arc is generated between the welding rod and a workpiece, and the welding of the workpiece is realized. In actual production and maintenance operation, welding tasks are often required to be completed in environments with limited operation spaces such as equipment interiors, pipeline gaps, structural interlayers and the like, the operation environments are usually narrow in space and limited in operation, and higher requirements on welding safety are set. Under the welding scene with limited operation space, the welding rod is easy to adhere to a workpiece in the arc striking or welding process due to factors such as limited welding posture, blocked visual field, small welding current and the like. Once the welding rod is adhered, a short circuit loop is formed, and the short circuit current can be rapidly increased in a very short time, so that the temperature of the clamping part of the welding rod and the electrode holder is rapidly increased. If the clamping relationship can not be released in time, not only the welding rod and the jaw are possibly caused to be locally overheated, the safety accidents such as scalding or fire disaster are possibly caused, but also the welding machine equipment is possibly damaged due to the impact of short-circuit current. In the prior art, the handling mode aiming at the welding rod adhesion problem mainly relies on manual intervention of operators, such as rapid swinging of a welding clamp to break the welding rod or manual loosening of a clamping structure of the welding clamp. However, in a welding environment with limited operation space, the hand movement range of an operator is limited, the manual processing action is often difficult to complete in time, so that the dangerous state after welding rod adhesion exists continuously, and the potential safety hazard is obviously increased. In addition, the existing partial electrode holders are easily affected by welding spatter, short-term contact or instantaneous current fluctuation, and have the problems of false triggering or untimely response, and are difficult to realize reliable protection under complex welding working conditions. Therefore, how to accurately judge the adhesion state of the welding rod in a welding environment with limited operation space and to timely release the clamping relationship without manual intervention becomes a technical problem to be solved in the manual arc welding field. Aiming at the defect that the existing data acquisition device of the resistance welding tongs only acquires welding parameters and the control device cannot adaptively adjust the state of the resistance welding tongs, the invention provides the data automatic acquisition system of the resistance welding tongs, which comprises a data detection unit and a collector, wherein the data detection unit comprises a transformer temperature sensor, a secondary voltage and current sensor and a pressure sensor; the collector comprises a data collection module, a welding trigger module, a collection signal conversion module, a collector control module, a data storage module and a data output module, wherein the data collection module collects data when collection parameters reach a threshold value of the welding trigger module, a transformer temperature sensor detects the temperature of a transformer, the collector outputs the temperature of the transformer, a secondary voltage sensor and a current sensor collect voltage on the side of the transformer and current of electrode caps respectively, and information collected by the pressure sensor reflects pressure between the two electrode caps in an electric welding state. The welding rod has the following defects that 1, data acquisition and recording are mainly carried out, data signals are output, and the welding rod cannot be immediately and automatically loosened when the welding rod is adhered, so that the safety problems of welding rod, jaw overheating, fire hazard, scalding and the like caused by overlarge short-circuit current are avoided. 2. The special sensing and diagnosis logic is not established aiming at the characteristic of the specific high-risk fault of 'welding rod adhesion', and the self-adaptive adjustment cannot be realized due to the fact that the normal temperature rise difference caused by different welding currents and different welding rod diameters cannot be adapted. 3. In the welding process, the sensor signal temporaril