Method for on-line monitoring of rolling mill main shaft component cracking

Abstract

The application discloses an online monitoring method for cracking of a rolling mill main shaft part, and the method comprises the following steps: embedding a built-in piezoelectric ultrasonic probe, an ultrasonic signal emission / collection and processing module, a wireless transmission module and a microprocessor; the embedding is arranged at the shaft neck positions of the two ends of a universal shaft fork head, and the main sound beam of the piezoelectric ultrasonic probe is a parallel transverse wave, that is, the main sound beam is parallel to the surface of the universal shaft fork head; a host computer sends a monitoring instruction to the microprocessor through the wireless transmission module, the microprocessor controls the piezoelectric ultrasonic probe to emit ultrasonic signals to the universal shaft fork head, and collects ultrasonic echo signal data, and the ultrasonic echo signal data is transmitted to the host computer through the wireless transmission module after being processed; the host computer performs characteristic analysis on the ultrasonic echo signal data, and determines the generation of a cracking crack and the crack propagation process based on the comparison of the ultrasonic echo signal data of all previous monitoring. The method realizes online monitoring of the cracking of the universal shaft fork head, and ensures the continuous production of a rolling line.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of equipment detection, in particular to an online monitoring method for cracking of a rolling mill main shaft component. BACKGROUND

[0002] Cracking accidents of the universal shaft fork head of the main transmission shaft of a heavy plate rolling mill have occurred in many domestic steel enterprises. The common cracking of the universal shaft usually occurs near the bolt root section of the shaft neck of the universal shaft fork head. After the crack extends to the surface of the fork head, it is usually confirmed by the way of magnetic powder detection. Since the universal shaft is a rotating component, it usually needs to be detected during shutdown or offline after disassembly. Both detection methods are difficult to fully detect the bolt root section area. The field detection not only needs to set up scaffolding, but also needs to clean the surface oil thoroughly before detection, which consumes a lot of time and labor. Moreover, the magnetic powder detection can only detect surface and near-surface cracks and cannot monitor the crack propagation process. SUMMARY

[0003] The technical problem to be solved by the present application is to provide an online monitoring method for cracking of a rolling mill main shaft component. The method overcomes the defects of traditional universal shaft fork head cracking detection, realizes online monitoring of universal shaft fork head cracking, provides a basis for predictive maintenance of the universal shaft fork head, ensures continuous production of the rolling line, reduces shutdown detection, and improves production efficiency and economic benefits.

[0004] To solve the above technical problems, the online monitoring method for cracking of a rolling mill main shaft component comprises the following steps:

[0005] Step one, make a nest matched with the shaft neck of the universal shaft fork head of the rolling mill main shaft, and embed a piezoelectric ultrasonic probe, an ultrasonic signal emission / collection and processing module, a wireless transmission module and a microprocessor in the nest;

[0006] Step two, fix the nest at the shaft neck positions of both ends of the universal shaft fork head, and make the main sound beam of the piezoelectric ultrasonic probe be parallel transverse waves, i.e. the main sound beam is parallel to the surface of the universal shaft fork head;

[0007] Step three, the host computer sends a monitoring instruction to the microprocessor through the wireless transmission module. The microprocessor controls the piezoelectric ultrasonic probe to emit ultrasonic signals to the universal shaft fork head through the ultrasonic signal emission / collection and processing module, and collects ultrasonic echo signal data. After processing, the ultrasonic echo signal data is transmitted to the host computer by the wireless transmission module;

[0008] Step four, the host computer analyzes the characteristics of the ultrasonic echo signal data, and determines the generation of cracking cracks and the crack propagation process based on the comparison of the ultrasonic echo signal data of the previous monitoring.

[0009] Further, the nested piezoelectric ultrasonic probe is four pairs for each side journal, and is uniformly distributed along the circumference of the nest.

[0010] Further, the nest is further provided with detachable and replaceable industrial lithium sulfochloride battery, which provides power supply for the piezoelectric ultrasonic probe, the ultrasonic signal emission / acquisition and processing module, the wireless transmission module and the microprocessor.

[0011] Further, the nest is fixed to the two end journal parts of the universal shaft fork head by using high-strength epoxy structural adhesive.

[0012] Further, the nest is fixed to the two end journal parts of the universal shaft fork head by using high-strength epoxy structural adhesive.

[0013] Further, the protective cover is made of aluminum alloy, stainless steel, PVC or synthetic resin material.

[0014] Since the rolling mill main shaft component cracking online monitoring method adopts the above technical scheme, i.e., the method is provided with a nest matched with the journal of the universal shaft fork head of the rolling mill main shaft, the nest is provided with a piezoelectric ultrasonic probe, an ultrasonic signal emission / acquisition and processing module, a wireless transmission module and a microprocessor; the nest is fixed to the two end journal parts of the universal shaft fork head, and the main sound beam of the piezoelectric ultrasonic probe is parallel transverse wave, i.e., the main sound beam is parallel to the surface of the universal shaft fork head; the host computer sends a monitoring instruction to the microprocessor through the wireless transmission module, the microprocessor controls the piezoelectric ultrasonic probe to emit ultrasonic signals to the universal shaft fork head, and collects ultrasonic echo signal data, which is transmitted to the host computer through the wireless transmission module after processing; the host computer analyzes the characteristics of the ultrasonic echo signal data, and determines the generation of cracking cracks and the crack propagation process based on the comparison of the ultrasonic echo signal data of the previous monitoring. The method overcomes the defects of the traditional universal shaft fork head cracking detection, realizes the online monitoring of the universal shaft fork head cracking, provides a basis for the predictive maintenance of the universal shaft fork head, ensures the continuous production of the rolling line, reduces the downtime detection, improves the production efficiency and economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0015] The application will be further described in detail below with reference to the drawings and embodiments:

[0016] Figure 1 The figure is a schematic diagram of the rolling mill main shaft component cracking online monitoring method of the application;

[0017] Figure 2 The figure is a schematic diagram of the piezoelectric ultrasonic probe arranged in the nest. DETAILED DESCRIPTION

[0018] The embodiments are as follows: Figure 1 and Figure 2As shown, the online monitoring method for rolling mill main shaft part cracking of the application comprises the following steps:

[0019] Step one, make the nest 2 matched with the journal of the rolling mill main shaft universal shaft fork head 1, the nest 2 is built-in piezoelectric ultrasonic probe 21, ultrasonic signal emission / acquisition and processing module, wireless transmission module and microprocessor;

[0020] Step two, fix the nest 2 respectively at the two end journal parts of the universal shaft fork head 1, and the main sound beam of the piezoelectric ultrasonic probe 21 is parallel transverse wave S, that is, the main sound beam is parallel to the surface of the universal shaft fork head 1;

[0021] Step three, the host computer sends monitoring instructions to the microprocessor through the wireless transmission module, the microprocessor controls the piezoelectric ultrasonic probe to emit ultrasonic signals to the universal shaft fork head 1 through the ultrasonic signal emission / acquisition and processing module, and collects ultrasonic echo signal data, and the ultrasonic echo signal data is transmitted to the host computer after processing by the wireless transmission module;

[0022] Step four, the host computer analyzes the characteristics of the ultrasonic echo signal data, and determines the generation of cracking cracks and the expansion process of the cracks based on the comparison of the ultrasonic echo signal data of the previous monitoring.

[0023] Preferably, the piezoelectric ultrasonic probe 21 built-in the nest 2 is four pairs for each side journal, and is uniformly distributed along the circumferential direction of the nest 2. When the piezoelectric ultrasonic probe is set, the design parameters of the refraction angle β of the main sound beam should ensure that the main sound beam S is parallel transverse wave, and the position of the main sound beam of the piezoelectric ultrasonic probe and the effectiveness of the scanning coverage can be determined through process test.

[0024] Preferably, the nest is also built-in detachable and replaceable industrial lithium sulfonyl chloride battery, the industrial lithium sulfonyl chloride battery provides the working power supply of the piezoelectric ultrasonic probe, the ultrasonic signal emission / acquisition and processing module, the wireless transmission module and the microprocessor. The replacement period of the battery depends on the frequency of use, and is generally replaced once every 1-2 years.

[0025] Preferably, the nest 2 is fixed on the bevel of the two end journal parts of the universal shaft fork head 1 by high-strength epoxy structural adhesive. When it is set, the fastness of the nest can be increased by increasing annular gasket or using the end face tooth bolt pre-tightening force of the universal shaft fork head, the coupling effect of the piezoelectric ultrasonic probe built-in the nest is ensured, the ultrasonic wave can be transmitted into the universal shaft fork head, and the nest should not be delaminated and have no relative movement with the main shaft during the repeated movement of the main shaft.

[0026] Preferably, after the nest is fixed on the two end journal parts of the universal shaft fork head, the protective cover 3 is buckled on the outer circle of the nest 2. The protective cover effectively protects the nest from being contaminated by oil dirt and dust, being scratched and worn, etc. under the working condition of the main shaft operation, so as to ensure the reliable work of the piezoelectric ultrasonic probe and each module built-in the nest.

[0027] Preferably, the protective cover 3 is made of aluminum alloy, stainless steel, PVC or synthetic resin material. The selection of the protective cover material needs to meet the requirements of providing effective protection for the nested piezoelectric ultrasonic probe and each module, not generating electromagnetic interference and not affecting the transmission of ultrasonic detection signals.

[0028] The method can test the monitoring sensitivity by physical test pieces, select the main sound beam refraction angle β of the piezoelectric ultrasonic probe that meets the monitoring sensitivity requirements, and the probe frequency, wafer size parameters, etc., process and manufacture the nest based on the sensitivity test results, so that the piezoelectric ultrasonic probe is matched with the curved surface of the universal shaft neck, to ensure that the two are closely attached. In actual application, the reasonable monitoring and information collection time and period can be determined according to the rolling line production situation, the use of the rolling mill main shaft, management needs, etc., and the generation and development of cracks can be determined based on the comparison of the ultrasonic waveform data of the previous monitoring.

[0029] The method adopts the nested piezoelectric ultrasonic probe and each module to form an integrated small sensing system to adapt to the limited space position of the universal shaft fork head neck; the long-term stable coupling of the nest and the universal shaft fork head is realized by the pasting and fixing mode, the monitoring information is obtained online, the starting crack and development are monitored by the parallel shear wave of the piezoelectric ultrasonic probe, the detection sensitivity is high, which is conducive to the detection of the cracks that have not obviously expanded, and the crack prevention is more effective; the remote control monitoring implementation and information transmission are realized by the wireless transmission module, the real-time monitoring information is obtained on the host computer, the method does not need to stop for detection or offline detection, and the production efficiency and capacity of the rolling line are improved.

Claims

1. An online monitoring method for cracking of rolling mill spindle components, characterized in that... This method includes the following steps: Step 1: Fabricate a nest that matches the journal of the universal joint fork of the rolling mill spindle. The nest contains a piezoelectric ultrasonic probe, an ultrasonic signal transmission / acquisition and processing module, a wireless transmission module, and a microprocessor. Step 2: Fix the nesting at the journal positions of both ends of the universal joint fork head, and make the main sound beam of the piezoelectric ultrasonic probe a parallel transverse wave, that is, the main sound beam is parallel to the surface of the universal joint fork head; Step 3: The host computer sends monitoring commands to the microprocessor via the wireless transmission module. The microprocessor controls the piezoelectric ultrasonic probe to emit ultrasonic signals to the universal joint fork head via the ultrasonic signal transmission / acquisition and processing module, and collects ultrasonic echo signal data. The ultrasonic echo signal data is processed and then transmitted to the host computer via the wireless transmission module. Step 4: The host computer performs feature analysis on the ultrasonic echo signal data. Based on the comparison of ultrasonic echo signal data from previous monitoring sessions, it determines the generation and propagation process of the crack.

2. The online monitoring method for cracking of rolling mill spindle components according to claim 1, characterized in that: The nested piezoelectric ultrasonic probes consist of four pairs on each side of the journal and are evenly distributed along the circumference of the nest.

3. The online monitoring method for cracking of rolling mill spindle components according to claim 1 or 2, characterized in that: The nested structure also contains a removable and replaceable industrial lithium thionyl chloride battery, which provides power to the piezoelectric ultrasonic probe, ultrasonic signal transmission / acquisition and processing module, wireless transmission module, and microprocessor.

4. The online monitoring method for cracking of rolling mill spindle components according to claim 3, characterized in that: The nesting is fixed to the inclined surfaces of the journals at both ends of the universal joint fork head using high-strength epoxy structural adhesive.

5. The online monitoring method for cracking of rolling mill spindle components according to claim 3, characterized in that: The nesting is fixed to the journal positions at both ends of the universal joint fork head, and then a protective cover is fastened to the outer ring of the nesting.

6. The online monitoring method for cracking of rolling mill spindle components according to claim 5, characterized in that: The protective cover is made of aluminum alloy, stainless steel, PVC or synthetic resin.

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