Method and device for detecting pre-tightening force of body of coal mining machine and electronic equipment

Abstract

The invention provides a coal mining machine body pretightening force detection method and device and electronic equipment, and the method comprises the steps: obtaining the initial length of a machine body tie bar before the operation of a coal mining machine, and collecting the real-time length of the machine body tie bar in real time during the operation of the coal mining machine; calculating the deformation of a machine body tie bar when the coal mining machine runs; the pre-tightening force of the pull rod is calculated according to the deformation of the pull rod of the coal mining machine body, and whether the pre-tightening force of the pull rod of the coal mining machine body meets the preset requirement or not when the coal mining machine runs is judged, so that the reliability and the stability of the pull rod of the coal mining machine body are further improved, and the safety and the stability of equipment are greatly enhanced; monitoring and alarming of the pre-tightening force of the coal mining machine body are achieved, the problems of equipment damage, water inflow of an electric control box and the like caused by loosening of screws of the machine body can be further prevented, and the intelligent degree, usability and reliability of the coal mining machine body pre-tightening force monitoring system are improved to a great extent.

Description

Technical Field

[0001] The present invention relates to the technical field of detecting the pre-tightening force of a shearer body, and specifically relates to a method and device for detecting the pre-tightening force of a shearer body, and an electronic device. Background Art

[0002] During the working process, the bolts of the shearer body bear huge vibrations and impact forces. The loosening and fracture of the bolts will lead to problems such as the sealing of the electric control box and abnormal wear of the mechanical structure, and ultimately will cause equipment failures and safety hazards. The shearer body is composed of a left traction unit, a right traction unit and an electric control box. The three parts are connected together by hydraulic tie rods and hydraulic nuts. The tension of the hydraulic tie rods can reflect the pre-tightening force of the shearer body.

[0003] The existing methods for detecting the pre-tightening force of the shearer body include: a method for real-time detection of the pre-tightening force of the shearer tie rod through a tension sensor and an external power device. However, this method requires an external power device to be set up and cannot be used for small shearers and when the installation space is limited. Due to the moving parts of the device during detection, the failure rate of the entire detection device is relatively high; there is also a method for detecting the pre-tightening force of the shearer by using a pressure sensor. By collecting the hydraulic oil pressure value of the hydraulic nut of the hydraulic tie rod, the tension of the hydraulic tie rod is obtained. This method is affected by factors such as the vibration of the body, the ambient temperature, and the oil leakage of the hydraulic nut, resulting in large measurement deviations, inaccurate measurement values, and high failure rates; there is also the nut torque measurement method. This method requires manual operation and cannot meet the purpose of real-time detection. Moreover, due to too many factors affecting the torque factor and many factors being uncontrollable, the measurement uncertainty is relatively large. Therefore, there is a lack of a detection method for the pre-tightening of the shearer body that is simple to operate and accurate in measurement in the prior art.

[0004] Therefore, the prior art still needs to be further developed. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and provide a method and device for detecting the pre-tightening force of a shearer body, and an electronic device to solve the problems existing in the prior art.

[0006] To achieve the above technical purpose, according to the first aspect of the present invention, the present invention provides a method for detecting the pre-tightening force of a shearer body, including: S100. Obtain the initial length of the body tie rod of the shearer before operation, and collect the real-time length of the body tie rod of the shearer in real time during operation; S200. Calculate the deformation amount of the body tie rod of the shearer during operation; S300. Calculate the pre-tightening force of the tie rod according to the deformation amount of the body tie rod of the shearer, and judge whether the pre-tightening force of the body tie rod of the shearer during operation meets the preset requirements.

[0007] Specifically, the S100 includes: Before the shearer runs, use ultrasonic technology to measure the initial length of the body tie rods, and during the operation of the shearer, measure the real-time length of the body tie rods of the shearer in real time.

[0008] Specifically, the method for calculating the deformation amount of the body tie rods of the shearer includes: Obtain the deformation amount of the body tie rods of the shearer during operation according to the difference between the initial length of the body tie rods before the shearer runs and the real-time length of the body tie rods during the operation of the shearer collected in real time.

[0009] Specifically, the method for calculating the deformation amount of the body tie rods of the shearer further includes: Use an ultrasonic device to emit an ultrasonic pulse electrical signal to the body tie rods of the shearer, calculate the time difference between the emitted and received ultrasonic pulse electrical signals. Before the shearer runs, record the time difference between the emitted and received ultrasonic pulse electrical signals as the first time difference. During the operation of the shearer, record the time difference between the emitted and received ultrasonic pulse electrical signals as the second time difference, and calculate the deformation amount of the body tie rods of the shearer according to the first time difference and the second time difference.

[0010] Specifically, the method for calculating the deformation amount of the body tie rods of the shearer according to the first time difference and the second time difference includes: Obtain the propagation speed of ultrasonic waves in the body tie rods of the shearer, denoted as V; Express the first time difference as T0 and the second time difference as T1, and then calculate the deformation amount of the body tie rods of the shearer. The specific calculation method is as follows: .

[0011] Specifically, the method for calculating the pre-tightening force of the tie rods according to the deformation amount of the body tie rods of the shearer includes: Based on the elastic modulus and equivalent cross-sectional area of the body tie rods of the shearer, obtain the corresponding relationship between the deformation amount of the body tie rods of the shearer and the pre-tightening force of the tie rods; According to the experimentally determined elastic modulus and equivalent cross-sectional area of the body tie rods, and then obtain the pre-tightening force of the tie rods through the deformation amount of the body tie rods of the shearer.

[0012] Specifically, the method for judging whether the pre-tightening force of the body tie rods during the operation of the shearer meets the preset requirements includes: Judge whether the pre-tightening force of the body tie rods during the operation of the shearer is greater than or equal to the preset pre-tightening force value, and judge whether the pre-tightening force of the body tie rods during the current operation of the shearer meets the preset requirements according to the judgment result.

[0013] Specifically, determining whether the pre-tightening force of the fuselage tie rod during the operation of the current shearer meets the preset requirements according to the judgment result includes: If the pre-tightening force of the fuselage tie rod during the operation of the shearer is greater than or equal to the preset pre-tightening force, it is determined that the pre-tightening force of the fuselage tie rod during the operation of the current shearer meets the preset requirements; If the pre-tightening force of the fuselage tie rod during the operation of the shearer is less than the preset pre-tightening force, it is determined that the pre-tightening force of the fuselage tie rod during the operation of the current shearer does not meet the preset requirements, that is, an alarm signal indicating that the pre-tightening force of the fuselage tie rod of the shearer does not meet the preset requirements is output.

[0014] According to the second aspect of the present invention, a detection device for the pre-tightening force of a shearer fuselage is provided, including: An acquisition module: used to acquire the initial length of the fuselage tie rod before the operation of the shearer, and to collect the real-time length of the fuselage tie rod during the operation of the shearer in real time; A control module: used to calculate the deformation amount of the fuselage tie rod during the operation of the shearer; and used to calculate the pre-tightening force of the tie rod according to the deformation amount of the fuselage tie rod of the shearer, and to judge whether the pre-tightening force of the fuselage tie rod during the operation of the shearer meets the preset requirements.

[0015] According to the third aspect of the present invention, an electronic device is provided, including: a memory; and a processor, where computer-readable instructions are stored on the memory, and when the computer-readable instructions are executed by the processor, the above-mentioned detection method for the pre-tightening force of the shearer fuselage is implemented.

[0016] Beneficial effects: The present invention calculates the pre-tightening force of the fuselage tie rod according to the deformation amount of the fuselage tie rod of the shearer, and judges whether the pre-tightening force of the fuselage tie rod during the operation of the shearer meets the preset requirements, further improving the reliability and stability of the fuselage tie rod of the shearer, greatly enhancing the safety and stability of the equipment, realizing the monitoring and alarm of the pre-tightening force of the shearer fuselage, and being able to further prevent problems such as equipment damage and water ingress into the electric control box caused by the loosening of the fuselage screws, and greatly improving the intelligent level, usability and reliability of the present invention. Description of the drawings

[0017] Figure 1 is a flowchart of the detection method for the pre-tightening force of the shearer fuselage provided in the specific embodiment of the present invention; Figure 2 is a flowchart of the detection process of the pre-tightening force of the fuselage provided in the specific embodiment of the present invention; Figure 3 is a schematic diagram of the composition of the detection device for the pre-tightening force of the shearer fuselage provided in the specific embodiment of the present invention; Figure 4 is a schematic diagram of the elongation of the fuselage tie rod of the shearer during the operation process provided in the specific embodiment of the present invention; Figure 5 It is a schematic diagram of the principle for measuring the deformation amount of the pull rod by using ultrasonic waves provided in the specific implementation manner of the present invention. Specific implementation manner

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application. In addition, the directional terms mentioned in the following embodiments, such as "upper", "lower", "left", "right", etc., are only references to the directions in the accompanying drawings. Therefore, the directional terms used are for illustration rather than limitation of the present invention.

[0019] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments.

[0020] Please refer to Figure 1 , this embodiment provides a method for detecting the pre-tightening force of the shearer body, including: S100. Obtain the initial length of the body pull rod of the shearer before operation, and collect the real-time length of the body pull rod of the shearer in real time during operation; Specifically, the S100 includes: Use ultrasonic technology to measure the initial length of the body pull rod of the shearer before operation, and measure the real-time length of the body pull rod of the shearer in real time during the operation of the shearer.

[0021] It can be understood that before the shearer operates, ultrasonic technology is used to obtain the initial length of the body pull rod. Ultrasonic technology is a non-contact measurement technology. It emits ultrasonic signals and then receives the reflected signals. According to the propagation time of the signals and the propagation speed of ultrasonic waves in the medium, the distance, that is, the length of the body pull rod, is calculated. During the operation of the shearer, ultrasonic technology is continuously used to measure the length of the body pull rod in real time. Since the force on the body pull rod may change during the operation of the shearer, its length may also change accordingly. Through real-time measurement, these changes can be captured in a timely manner, so that abnormal changes in the length of the body pull rod can be detected in a timely manner. If the length of the pull rod exceeds the normal range, it may indicate uneven force on the pull rod or structural problems, such as pull rod deformation, connection looseness, etc. This early detection helps to avoid failures during the operation of the shearer, ensures the safety of shearer operators, further extends the service life of the shearer, reduces equipment maintenance costs, and greatly improves the overall production efficiency of coal mining operations.

[0022] S200. Calculate the deformation amount of the body pull rod of the shearer during operation.

[0023] Specifically, the method for calculating the deformation amount of the body tie rods of a shearer includes: Obtaining the deformation amount of the body tie rods of the shearer during operation based on the difference between the initial length of the body tie rods of the shearer before operation and the real-time length of the body tie rods of the shearer collected in real time during operation.

[0024] See Figure 4 , in some specific embodiments, first, it is clear that there are two key length data. One is the initial length of the body tie rods of the shearer before operation, and the other is the real-time length of the body tie rods of the shearer collected in real time during the operation process. The calculation of the deformation amount is to subtract the real-time length from the initial length (or subtract the initial length from the real-time length, depending on whether the deformation amount is defined as elongation or shortening. Here, it is assumed that subtracting the real-time length from the initial length is the elongation deformation amount). For example, if the initial length is L0 and the real-time length is L1, then the deformation amount ΔL = L0 - L1. The deformation amount is an important indicator reflecting the structural state of the body tie rods. By calculating the deformation amount, the deformation degree of the tie rods during the operation of the shearer can be intuitively understood. If the deformation amount is within a reasonable range, it indicates that the tie rod structure is stable and the overall structure of the shearer is in a normal working state; if the deformation amount exceeds the normal range, it indicates that the tie rods may be under excessive stress or there may be quality problems with the tie rods themselves, etc., and it is necessary to check and handle them in a timely manner. Calculating the deformation amount in real time can provide real-time fault warnings for the shearer. Once the deformation amount approaches or exceeds the critical value, an alarm can be issued in a timely manner to remind the operator to stop the operation of the shearer, check and maintain the tie rods, thereby effectively preventing serious faults such as tie rod fractures and body structure damage caused by excessive tie rod deformation, ensuring the safe operation of the shearer, and improving the overall performance and reliability of the shearer.

[0025] Specifically, the method for calculating the deformation amount of the body tie rods of the shearer further includes: Using an ultrasonic device to emit ultrasonic pulse electrical signals to the body tie rods of the shearer, calculating the time difference between the emitted and received ultrasonic pulse electrical signals. Before the shearer operates, record the time difference between the emitted and received ultrasonic pulse electrical signals as the first time difference. When the shearer is operating, record the time difference between the emitted and received ultrasonic pulse electrical signals as the second time difference, and calculate the deformation amount of the body tie rods of the shearer based on the first time difference and the second time difference.

[0026] Specifically, the method for calculating the deformation amount of the body tie rods of the shearer based on the first time difference and the second time difference includes: Obtaining the propagation speed of ultrasonic waves in the body tie rods of the shearer, denoted as V; Denote the first time difference as T0 and the second time difference as T1, and then calculate the deformation amount of the body tie rods of the shearer , the specific calculation method is as follows: .

[0027] See Figure 5 , in some specific embodiments, since the propagation time of the ultrasonic signal is proportional to the pre-tightening force of the pull rod, the deformation amount of the pull rod of the shearer body can be calculated by using the time difference between the ultrasonic pulse electric signals transmitted and received by the ultrasonic device to the pull rod of the shearer body.

[0028] Furthermore, to obtain the propagation speed V of the ultrasonic wave in the pull rod of the shearer body, it may be necessary to determine it through pre-experiments or according to physical properties such as the material of the pull rod. The ultrasonic measurement technology itself has high precision. By accurately measuring the time difference between the transmitted and received ultrasonic pulse electric signals to calculate the deformation amount, accurate pull rod deformation amount data can be obtained, which helps to more accurately grasp the state of the pull rod of the shearer body, especially in the case where fine monitoring of the pull rod deformation amount is required. At the same time, it can be measured and calculated in real time during the operation of the shearer. Once the deformation amount of the pull rod shows abnormal changes, it can be promptly fed back to the operator or the control system, and measures can be taken in a timely manner. The above ultrasonic-based measurement method has good adaptability to the specific measurement object of the pull rod of the shearer body. It does not require direct physical contact with the pull rod or complex installation operations, reduces the interference to the normal operation of the shearer, and also reduces the difficulty of equipment installation and maintenance.

[0029] S300. Calculate the pre-tightening force of the pull rod according to the deformation amount of the pull rod of the shearer body, and determine whether the pre-tightening force of the pull rod of the shearer body during operation meets the preset requirements.

[0030] Specifically, the method for calculating the pre-tightening force of the pull rod according to the deformation amount of the pull rod of the shearer body includes: Based on the elastic modulus and equivalent cross-sectional area of the pull rod of the shearer body, obtain the corresponding relationship between the deformation amount of the pull rod of the shearer body and the pre-tightening force of the pull rod; According to the experimentally determined elastic modulus and equivalent cross-sectional area of the pull rod of the shearer body, and then obtain the pre-tightening force of the pull rod through the deformation amount of the pull rod of the shearer body.

[0031] In some specific embodiments, according to the mathematical relationship between the deformation amount ΔL and the pre-tightening force F, the pre-tightening force F is calculated. The mathematical relationship is as follows: ; where F is the pre-tightening force of the pull rod; E is the elastic modulus of the pull rod material; S is the equivalent cross-sectional area of the pull rod; ΔL is the deformation amount of the pull rod; L is the clamping length of the pull rod. According to the above formula and ΔL, the pre-tightening force F of the current pull rod is calculated.

[0032] Furthermore, according to the experimentally measured elastic modulus and equivalent cross-sectional area of the fuselage tie rod, for example: install a piezoelectric ceramic sheet at the head of the tie rod, use an ultrasonic tie rod pre-tightening force measuring instrument to apply an electrical pulse excitation of a certain frequency to the piezoelectric ceramic sheet. Due to the inverse piezoelectric effect of the piezoelectric ceramic, the ceramic sheet will generate weak mechanical waves. When the mechanical wave reaches the bottom of the tie rod, it will be reflected due to the different medium. The reflected wave will generate an electrical signal due to the piezoelectric effect. Use the pre-tightening force measuring instrument to measure this electrical signal, and the propagation time of the wave in the screw can be obtained. When the tie rod is pre-tightened, the screw will be elongated, resulting in a longer propagation time of the wave in the screw. Through this time difference, the material sound velocity, and the elastic modulus, the pre-tightening force can be calculated. To achieve higher measurement accuracy, the demander needs to provide a relatively accurate clamping length L of the tie rod.

[0033] Calibration process example: (1) Conduct a calibration experiment on the tie rod to be measured: Load in steps of 80 KN within the rated range, and at the same time use an iFast-Standard bolt pre-tightening force measuring instrument to measure, calculate and obtain the relationship between the acoustic time difference (the time difference between the ultrasonic pulse electrical signals of ultrasonic emission and reception) and the pre-tightening force, obtain the calibration data of the relationship between the acoustic time difference and the pre-tightening force, establish a table of the calibration data, and establish the corresponding relationship between the acoustic time difference and the pre-tightening force.

[0034] (2) On-site measurement (zero setting): After the adhesive layer is completely cured, record the original state T0 acoustic time of each measured tie rod and record it in the software. Tips: When zero setting (recording the reference state T0 of the tie rod), it is recommended to perform temperature equilibrium, with a reference time of 30 minutes, and record the ultrasonic measurement equipment, cable length, probe and other accessories used.

[0035] (3) On-site measurement: Grind - paste the tie rod - establish a project number - mark the initial echo time of each tie rod as t0 - measure the echo time t1 (acoustic time difference) after the bolt is loaded - calculate the axial force by the software. It is also recommended to perform temperature equilibrium before each measurement, especially after the road test link, when the temperature difference fluctuation of the tie rod workpiece is large, extend the temperature equilibrium time.

[0036] Specifically, the method for judging whether the pre-tightening force of the fuselage tie rod during the operation of the shearer meets the preset requirements includes: Judge whether the pre-tightening force of the fuselage tie rod during the operation of the shearer is greater than or equal to the preset pre-tightening force value, and judge whether the pre-tightening force of the fuselage tie rod during the current operation of the shearer meets the preset requirements according to the judgment result.

[0037] Specifically, the judgment of whether the pre-tightening force of the fuselage tie rod during the current operation of the shearer meets the preset requirements includes: If the pre-tightening force of the body tie rod during the operation of the shearer is greater than or equal to the preset pre-tightening force, it is determined that the pre-tightening force of the body tie rod during the current operation of the shearer meets the preset requirements; If the pre-tightening force of the body tie rod during the operation of the shearer is less than the preset pre-tightening force, it is determined that the pre-tightening force of the body tie rod during the current operation of the shearer does not meet the preset requirements, that is, an alarm signal indicating that the pre-tightening force of the body tie rod of the shearer does not meet the preset requirements is output.

[0038] It can be understood that the present invention sets a preset pre-tightening force value, which is specifically determined according to the pre-tightening force condition required for the normal operation of the body tie rod of the shearer. By directly comparing the magnitude relationship between the actual pre-tightening force and the preset pre-tightening force value, if the pre-tightening force of the body tie rod during the operation of the shearer is greater than or equal to the preset pre-tightening force, it means that the pre-tightening force of the tie rod reaches or exceeds the standard required for normal operation. Therefore, it is determined that the pre-tightening force of the body tie rod during the current operation of the shearer meets the preset requirements. On the contrary, if the pre-tightening force of the body tie rod during the operation of the shearer is less than the preset pre-tightening force, it indicates that the pre-tightening force of the tie rod is insufficient and cannot meet the requirements of normal operation. At this time, it is determined that the pre-tightening force of the body tie rod during the current operation of the shearer does not meet the preset requirements, and the system will output an alarm signal indicating that the pre-tightening force of the body tie rod of the shearer does not meet the preset requirements. This alarm signal can remind the operator to take corresponding measures, such as adjusting the tie rod to increase the pre-tightening force, etc., thereby further ensuring that the body tie rod of the shearer works under the appropriate pre-tightening force state and guaranteeing the normal operation of the shearer.

[0039] Please refer to Figure 2 , the working principle of the present invention will be described below through specific examples: Step 1: Calibrate the initial length of the body connecting tie rod of the shearer in the laboratory, or conduct the characteristic calibration of the body connecting tie rod of the shearer in the laboratory to obtain the characteristic value of the body connecting tie rod; Step 2: Adopt ultrasonic technology to measure the length value of the tie rod and retain it before using the tie rod; Step 3: Calculate the elongation (deformation) of the tie rod, and obtain the pre-tightening force value by using the relationship between the elongation of the tie rod and the pre-tightening force; Step 4: Determine whether the current pre-tightening force value meets the requirements, that is, whether the current pre-tightening force value meets the preset pre-tightening force value (the body pre-tightening force alarm setting value). If it does not meet the requirements, an alarm signal corresponding to not meeting the preset requirements is output.

[0040] It should be noted here that this embodiment provides a method for detecting the pre-tightening force of the shearer body. The pre-tightening force of the tie rod is calculated according to the deformation amount of the tie rod of the shearer body, and it is judged whether the pre-tightening force of the tie rod of the shearer body during operation meets the preset requirements. This further improves the reliability and stability of the tie rod of the shearer body, greatly enhances the safety and stability of the equipment, realizes the monitoring and alarm of the pre-tightening force of the shearer body, can further prevent problems such as equipment damage and water ingress into the electric control box caused by the loosening of the body screws, and greatly improves the intelligence, usability and reliability of the present invention.

[0041] Please refer to Figure 3 , this embodiment provides a detection device for the pre-tightening force of the shearer body. The system includes: Acquisition module 100: It is used to acquire the initial length of the tie rod of the shearer body before operation, and to collect the real-time length of the tie rod of the shearer body in real time during operation. Control module 200: It is used to calculate the deformation amount of the tie rod of the shearer body during operation; and to calculate the pre-tightening force of the tie rod according to the deformation amount of the tie rod of the shearer body, and to judge whether the pre-tightening force of the tie rod of the shearer body during operation meets the preset requirements.

[0042] It should be noted here that this embodiment provides a detection device for the pre-tightening force of the shearer body. The pre-tightening force of the tie rod is calculated according to the deformation amount of the tie rod of the shearer body, and it is judged whether the pre-tightening force of the tie rod of the shearer body during operation meets the preset requirements. This further improves the reliability and stability of the tie rod of the shearer body, greatly enhances the safety and stability of the equipment, realizes the monitoring and alarm of the pre-tightening force of the shearer body, can further prevent problems such as equipment damage and water ingress into the electric control box caused by the loosening of the body screws, and greatly improves the intelligence, usability and reliability of the present invention.

[0043] In a preferred embodiment, the present application also provides an electronic device, and the electronic device includes: A memory; and a processor, wherein computer-readable instructions are stored on the memory, and when the computer-readable instructions are executed by the processor, the detection method of the pre-tightening force of the shearer body is implemented. This computer device can generally be a server, a terminal, or any other electronic device with necessary computing and / or processing capabilities. In one embodiment, the computer device may include a processor, a memory, a network interface, a communication interface, etc. connected through a system bus. The processor of the computer device can be used to provide necessary computing, processing, and / or control capabilities. The memory of the computer device may include a non-volatile storage medium and an internal memory. An operating system, a computer program, etc. may be stored in or on the non-volatile storage medium. The internal memory can provide an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface and the communication interface of the computer device can be used to connect and communicate with external devices through a network. When the computer program is executed by the processor, the steps of the method of the present invention are executed.

[0044] The present invention can be implemented as a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method of the embodiments of the present invention are caused to be executed. In one embodiment, the computer program is distributed on multiple computer devices or processors coupled by a network, so that the computer program is stored, accessed, and executed in a distributed manner by one or more computer devices or processors. A single method step / operation, or two or more method steps / operations, can be executed by a single computer device or processor or by two or more computer devices or processors. One or more method steps / operations can be executed by one or more computer devices or processors, and one or more other method steps / operations can be executed by one or more other computer devices or processors. One or more computer devices or processors can execute a single method step / operation, or execute two or more method steps / operations.

[0045] It should be noted here that the present invention calculates the pre-tightening force of the tie rod according to the deformation amount of the tie rod of the shearer body, and judges whether the pre-tightening force of the tie rod of the shearer body during operation meets the preset requirements, further improving the reliability and stability of the tie rod of the shearer body, greatly enhancing the safety and stability of the equipment, realizing the monitoring and alarming of the pre-tightening force of the shearer body, and being able to further prevent problems such as equipment damage caused by the loosening of the body screws and water ingress into the electric control box, greatly improving the intelligence, usability, and reliability of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0047] The technical features described above can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification as long as such a combination does not exist in contradiction.

[0048] The specific embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for detecting the preload force of a coal mining machine body, characterized in that: include: S100, obtaining the initial length of the body tie rod before the coal mining machine is running, and collecting the real-time length of the body tie rod when the coal mining machine is running; S200, calculating the deformation of the body tie rod when the coal mining machine is running; S300, calculating the preload force of the tie rod according to the deformation of the tie rod of the coal mining machine body, and determining whether the preload force of the tie rod of the coal mining machine body when the coal mining machine is running meets the preset requirements.

2. The method for detecting the preload force of a coal mining machine body according to claim 1, characterized in that: The S100 includes: Ultrasonic technology is used to measure the initial length of the shearer body tie rod before the operation of the coal mining machine, and the real-time length of the shearer body tie rod is measured in real time during the operation of the coal mining machine.

3. The method for detecting the preload force of a coal mining machine body according to claim 1, characterized in that: The method for calculating the deformation of the tie rod of the coal mining machine body comprises: The deformation of the body tie rod when the coal shearer is running is obtained according to the difference between the initial length of the body tie rod before the coal shearer is running and the real-time length of the body tie rod when the coal shearer is running.

4. The method for detecting the preload force of a coal mining machine body according to claim 1, characterized in that: The method for calculating the deformation of the tie rod of the coal mining machine body also includes: An ultrasonic device is used to transmit ultrasonic pulse electric signals to the pull rod of the coal mining machine body, and the time difference between the transmitted and received ultrasonic pulse electric signals is calculated. Before the coal mining machine is operated, the time difference between the transmitted and received ultrasonic pulse electric signals is recorded as the first time difference. When the coal mining machine is running, the time difference between the transmitted and received ultrasonic pulse electric signals is recorded as the second time difference. The deformation of the pull rod of the coal mining machine body is calculated based on the first time difference and the second time difference.

5. The method for detecting the preload force of a coal mining machine body according to claim 4, characterized in that: The method for calculating the deformation of the tie rod of the coal mining machine body according to the first time difference and the second time difference comprises: Obtain the propagation velocity of the ultrasonic wave in the tie rod of the coal mining machine, denoted as V; The first time difference is expressed as T0, and the second time difference is expressed as T1, and then the deformation of the tie rod of the coal mining machine body is calculated. , the specific calculation method is as follows: 。 6. The method for detecting the preload force of a coal mining machine body according to claim 5, characterized in that: The method for calculating the preload force of the tie rod according to the deformation of the tie rod of the coal mining machine body comprises: Based on the elastic modulus and equivalent cross-sectional area of ​​the tie rod of the coal mining machine body, the corresponding relationship between the deformation of the tie rod of the coal mining machine body and the preload force of the tie rod is obtained; The elastic modulus and equivalent cross-sectional area of ​​the body tie rod are determined experimentally, and then the preload force of the tie rod is obtained through the deformation of the body tie rod of the coal mining machine.

7. The method for detecting the preload force of a coal mining machine body according to claim 6, characterized in that: The method for judging whether the preload force of the body tie rod of the coal mining machine during operation meets the preset requirements comprises: Determine whether the preload force of the body tie rod when the coal mining machine is running is greater than or equal to the preset preload force value, and determine whether the preload force of the body tie rod when the coal mining machine is currently running meets the preset requirements based on the judgment result.

8. The method for detecting the preload force of a coal mining machine body according to claim 5, characterized in that: The step of determining whether the preload force of the body tie rod during the current operation of the coal mining machine meets the preset requirements according to the judgment result includes: If the preload force of the body tie rod when the coal mining machine is running is greater than or equal to the preset preload force, it is determined that the preload force of the body tie rod when the coal mining machine is currently running meets the preset requirement; If the preload force of the body tie rod when the coal mining machine is running is less than the preset preload force, it is determined that the preload force of the body tie rod when the coal mining machine is currently running does not meet the preset requirements, that is, an alarm signal is output that the preload force of the body tie rod of the coal mining machine does not meet the preset requirements.

9. A device for detecting the preload force of a coal mining machine body, characterized in that: include: Acquisition module: used to acquire the initial length of the tie rod of the coal mining machine before the operation, and to acquire the real-time length of the tie rod of the coal mining machine when the coal mining machine is in operation; Control module: used to calculate the deformation of the machine body tie rod when the coal mining machine is running; The method is also used to calculate the preload force of the tie rod according to the deformation of the tie rod of the coal mining machine body, and to determine whether the preload force of the tie rod of the coal mining machine body when the coal mining machine is running meets the preset requirements.

10. An electronic device, characterized in that: include: Memory; and a processor, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the method for detecting the preload force of the coal mining machine body according to any one of claims 1 to 8 is implemented.

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