A mobile hydraulic cylinder calibration and replacement device

Abstract

The present application relates to the technical fields of hydraulic cylinder replacement, and discloses a mobile hydraulic cylinder calibration and replacement device, which comprises a frame with a fixed crossbeam arranged therein, a fixing assembly arranged on the crossbeam, the fixing assembly being used for fixing the hydraulic cylinder, a vertical hydraulic jack arranged directly below the hydraulic cylinder, a movable rod of the vertical hydraulic jack corresponding to a rod of the hydraulic cylinder, a pressure sensor connected to a cylinder of the hydraulic cylinder, an angle sensor connected to the cylinder of the hydraulic cylinder, a monitoring controller arranged on the frame, the pressure sensor and the angle sensor being respectively connected to the monitoring controller, and an infrared calibration assembly arranged on the frame and facing the hydraulic cylinder. The hydraulic cylinder calibration and replacement device effectively reduces the damage to the machine body and the difficulty of oil seal during the removal of the mining mechanical cylinder, improves the cylinder dismounting efficiency, reduces the downtime of the mining machine, ensures the mining efficiency of the underground coal, and has important significance for the safe and efficient production of the coal mine.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder replacement technology, and in particular to a mobile hydraulic cylinder calibration and replacement device. Background Technology

[0002] Coal, as a fundamental energy source for industrial and social development, is a guarantee for national economic development and social stability, playing a dominant role in primary energy and this dominant role is unlikely to change for a long time. Mining machinery, as key equipment in coal mine production, plays an indispensable role. Hydraulic cylinders, as one of the essential components for the normal operation of mining machinery, are prone to deformation, oil leakage, and localized cracking due to the complex underground working environment. Once a hydraulic cylinder malfunctions, the entire tunneling machine will be unable to operate normally and will have to be shut down for repairs.

[0003] When repairing hydraulic cylinders, it is necessary to disassemble and inspect them, replace relevant parts, and then reinstall and calibrate them. However, most existing hydraulic cylinder disassembly and assembly devices have simple structures and only have basic disassembly and assembly functions. When using them, workers mostly use simple tools to calibrate the hydraulic cylinder at the initial stage of installation. However, during the installation process, internal pressure often occurs in the cylinder body, causing a slight deflection of the cylinder body, which leads to poor installation accuracy and affects the service life of the hydraulic cylinder.

[0004] In view of this, the present invention proposes a mobile hydraulic cylinder calibration and replacement device. Summary of the Invention

[0005] This invention proposes a mobile hydraulic cylinder calibration and replacement device to address the shortcomings of the prior art. This hydraulic cylinder calibration and replacement device can effectively reduce damage to the machine body during the disassembly of mining machinery cylinders and improve the installation accuracy of the cylinders.

[0006] The technical solution of the present invention is: a mobile hydraulic cylinder calibration and replacement device, comprising a frame, wherein a fixed crossbeam is provided within the frame, and further comprising:

[0007] A fixing component is mounted on the crossbeam; the fixing component is used to fix the hydraulic cylinder.

[0008] A vertical hydraulic jack is positioned directly below the hydraulic cylinder; the movable rod of the vertical hydraulic jack corresponds to the rod of the hydraulic cylinder.

[0009] An infrared aiming assembly is mounted on the frame, and the infrared aiming assembly faces the hydraulic cylinder;

[0010] The detection component includes a pressure sensor and an angle sensor. The pressure sensor is connected to the hydraulic cylinder barrel and is used to measure the pressure in the hydraulic cylinder barrel. The angle sensor is connected to the hydraulic cylinder barrel and is used to measure the angle change of the hydraulic cylinder.

[0011] A monitoring controller is mounted on the frame, and the pressure sensor and angle sensor are respectively connected to the monitoring controller for signal transmission.

[0012] In at least one embodiment of this disclosure, the monitoring controller includes: a control module and a data processing module; the infrared calibration component is signal-connected to the control module; the control module and the data processing module are signal-connected; the pressure sensor and the angle sensor are respectively signal-connected to the data processing module; the data processing module stores a normal range threshold for the measured parameter P'; and the data processing module has a built-in automatic calibration algorithm for calculating the measured parameter P'.

[0013] The pressure sensor outputs a voltage U that represents pressure information.

[0014] The angle sensor outputs a voltage Ut that represents angle information.

[0015] The measured parameter P' can be represented by a bivariate function of U and Ut, that is:

[0016] P'=f(U,U t Pi, determined by two-dimensional coordinates (Ui, Uit), lies on the same plane and can be described by a two-dimensional regression equation: P'=a0+a1U+a2Ut+a3U2+a4UUt+a5U2t+ε1;

[0017] In the formula: a0~a5 are constant coefficients; ε1 is a higher-order infinitesimal;

[0018] The coefficients a0 to a5 are obtained by the least squares method. They are then substituted into the two-dimensional regression equation to determine the binary input-output characteristics of the measured parameter P′ and the output U. When the output values ​​U and Ut of the two sensors are collected, they can be substituted into the equation to calculate the measured parameter P′ of the sensor.

[0019] The data processing module is used to compare the obtained measured parameter P' with the stored normal range threshold of the measured parameter P'. If the obtained measured parameter P' exceeds the normal threshold, the data processing module sends information to the control module, and the control module issues a warning message based on the information sent by the data processing module.

[0020] In at least one embodiment of this disclosure, the infrared aiming assembly has two aiming modes: circular and crosshair, and the infrared aiming assembly is also equipped with a gimbal level.

[0021] In at least one embodiment of this disclosure, the monitoring controller further includes a displacement sensor connected to the hydraulic cylinder barrel.

[0022] In at least one embodiment of this disclosure, a gas pressure gauge is also included, which is connected to the hydraulic cylinder barrel.

[0023] In at least one embodiment of this disclosure, the frame is a rectangular frame structure, and multiple support beams are provided on opposite sides of the frame, with through holes on each support beam for the fixed crossbeam to pass through.

[0024] In at least one embodiment of this disclosure, the fixing component is a cylindrical ring, which is fitted onto the hydraulic cylinder barrel.

[0025] In at least one embodiment of this disclosure, a fixing beam is provided above the crossbeam of the frame, and the fixing beam is used to fix the tail of the cylinder of the hydraulic cylinder.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. This invention, by setting up an infrared alignment component, can first accurately position the hydraulic cylinder during installation. Then, by setting pressure and angle sensors on the hydraulic cylinder, and working with a monitoring controller, it can monitor the gas pressure inside the hydraulic cylinder and the displacement of the hydraulic cylinder in real time during the installation process. This prevents the pressure inside the hydraulic cylinder from exceeding the normal range or damage to the hydraulic cylinder, thus ensuring the installation accuracy of the hydraulic cylinder.

[0028] 2. This invention sets up a data processing algorithm on the data processing module in the monitoring controller. The processing algorithm fuses the measured values ​​of the pressure sensor and the angle sensor, and uses the data results to diagnose hydraulic cylinder faults and help improve the disassembly and assembly accuracy of hydraulic cylinders.

[0029] 3. The hydraulic cylinder calibration and replacement device proposed in this invention effectively reduces problems such as machine damage, difficulty in sealing oil seals, and high labor consumption during the disassembly of hydraulic cylinders in mining machinery, and avoids problems such as high labor intensity and accidental injury to personnel during disassembly and assembly. It greatly improves the efficiency of hydraulic cylinder disassembly and assembly, reduces the downtime of mining machinery, and ensures the efficiency of underground coal mining, which is of great significance to the safe and efficient production of coal mines. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0031] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0032] Figure 3 This is a side view of the structure of the present invention;

[0033] Figure 4 This is a schematic diagram of the sensor hardware of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Frame; 11. Fixed crossbeam; 12. Support beam; 2. Fixing components; 3. Vertical hydraulic jack; 4. Gas pressure gauge; 5. Infrared calibration components; 61. Displacement sensor; 62. Pressure sensor; 63. Angle sensor. Detailed Implementation

[0036] The accompanying drawings in this disclosure are not drawn to scale, and the specific dimensions and quantity of each structure can be determined according to actual needs. The drawings described in this disclosure are only structural schematic diagrams.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar words used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "inner," "outer," "upper," "lower," "far," "near," "front," and "rear" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0039] Coal, as a fundamental energy source for industrial and social development, is a guarantee for national economic development and social stability, playing a dominant role in primary energy and this dominant role is unlikely to change for a long time. Mining machinery, as key equipment in coal mine production, plays an indispensable role. Hydraulic cylinders, as one of the essential components for the normal operation of mining machinery, are prone to deformation, oil leakage, and localized cracking due to the complex underground working environment. Once a hydraulic cylinder malfunctions, the entire tunneling machine will be unable to operate normally and will have to be shut down for repairs.

[0040] When repairing hydraulic cylinders, it is necessary to disassemble and inspect them, replace relevant parts, and then reinstall and calibrate them. However, most existing hydraulic cylinder disassembly and assembly devices have simple structures and only have basic disassembly and assembly functions. When using them, workers mostly use simple tools to calibrate the hydraulic cylinder at the initial stage of installation. However, during the installation process, internal pressure often occurs in the cylinder body, causing a slight deflection of the cylinder body, which leads to poor installation accuracy and affects the service life of the hydraulic cylinder.

[0041] Based on this, in order to reduce the labor intensity of workers, improve work efficiency, and eliminate safety hazards, after conducting multiple on-site investigations of the main mining machinery used in existing coal mines, such as MG900 / 2245-GWD, MG900 / 2210-WD, EBZ-135, EBZ-160, and EBZ-200, a proposal was made to develop a control device for the rapid and easy disassembly and installation of hydraulic cylinders in mining machinery.

[0042] Combination Figures 1 to 4 As shown, a mobile hydraulic cylinder calibration and replacement device includes a frame 1, a fixed crossbeam 11 inside the frame 1, and further includes:

[0043] Fixing component 2 is mounted on crossbeam 11; fixing component 2 is used to fix the hydraulic cylinder.

[0044] The vertical hydraulic jack 3 is positioned directly below the hydraulic cylinder; the movable rod of the vertical hydraulic jack 3 corresponds to the rod of the hydraulic cylinder.

[0045] The detection component includes a pressure sensor 62 and an angle sensor 63. The pressure sensor 62 is connected to the hydraulic cylinder barrel and is used to measure the pressure in the hydraulic cylinder barrel. The pressure sensor 62 has a measurement range of 0 to 100 MPa and an accuracy of 0.1%. The angle sensor 63 is connected to the hydraulic cylinder barrel and is used to measure the angle change of the hydraulic cylinder. The angle sensor 63 is used to detect possible tilting of the cylinder during cylinder assembly and disassembly. The angle sensor 63 has a measurement range of 0 to 360 degrees and an accuracy of 0.1 degrees.

[0046] A monitoring controller is mounted on frame 1, and pressure sensor 62 and angle sensor 63 are respectively connected to the monitoring controller for signal transmission.

[0047] Infrared aiming component 5 is mounted on frame 1, with infrared aiming component 5 facing the hydraulic cylinder.

[0048] Specifically, the bottom of the frame 1 is also provided with a base, and the vertical hydraulic jack 3 is set on the base.

[0049] As an alternative embodiment, the monitoring controller includes: a control module and a data processing module; an infrared calibration component 5 is signal-connected to the control module; the control module and the data processing module are signal-connected; and a pressure sensor 62 and an angle sensor 63 are signal-connected to the data processing module, respectively. The data processing module stores the normal range threshold of the measured parameter P' and has a built-in automatic calibration algorithm for calculating the measured parameter P'.

[0050] The output voltage U of pressure sensor 62 represents pressure information;

[0051] The output voltage Ut of the angle sensor 63 represents angle information;

[0052] P'=f(U,U t Pi, determined by two-dimensional coordinates (Ui, Uit), lies on the same plane and can be described by a two-dimensional regression equation: P'=a0+a1U+a2Ut+a3U2+a4UUt+a5U2t+ε1;

[0053] In the formula: a0~a5 are constant coefficients; ε1 is a higher-order infinitesimal;

[0054] The coefficients a0 to a5 are obtained by the least squares method. They are substituted into the two-dimensional regression equation to determine the binary input-output characteristics of the measured parameter P' and the output U. When the output values ​​U and Ut of the two sensors are collected, they can be substituted into the equation to calculate the measured parameter P' of the sensor.

[0055] The data processing module compares the obtained measured parameter P' with the stored normal range threshold of the measured parameter P'. If the obtained measured parameter P' exceeds the normal threshold, the data processing module sends information to the control module, and the control module issues a warning message based on the information sent by the data processing module.

[0056] Specifically, the basic idea of ​​regression analysis is to establish the correspondence between the measured target parameter and the sensor output using a multidimensional regression equation. Unlike classic one-dimensional sensor calibration, multidimensional calibration experiments are performed, and the coefficients in the regression equation are calculated from the experimental calibration data using the least squares method. Thus, when the sensor output value is measured, the corresponding input target parameter can be calculated from the multidimensional regression equation with known coefficients.

[0057] The data processing module also stores the normal threshold range of the measured parameter P'. Specifically, the normal threshold range of the measured parameter P' is derived based on previous experience data or experimental results.

[0058] In actual operation, the measured parameter P' is used for fault diagnosis of hydraulic cylinders in the following way:

[0059] 1. Real-time monitoring: When the real-time monitored P' value exceeds this threshold, a possible fault can be identified. For example, if the normal range of P' is between 100 and 200, but a P' value of 250 is detected in a certain instance, it may indicate abnormal hydraulic system pressure, leakage, or blockage.

[0060] 2. Trend Analysis: Continuously monitor the trend of P'. If P' shows a gradual upward or downward trend, even if the current value is still within the normal range, it may indicate that a potential fault is gradually developing. For example, a continuous increase in P' may indicate that the wear of a certain component is accelerating, leading to increased resistance.

[0061] 3. Comparative Analysis: Compare the P' values ​​at different locations or under different operating conditions within the same hydraulic system. Significant differences may indicate a localized fault. For example, comparing the P' values ​​of the same cylinder at different extension and retraction phases; if the difference is too large, it may indicate that a seal has failed at a specific stage.

[0062] Using the measured parameter P′ to help improve the assembly and disassembly accuracy of hydraulic cylinders:

[0063] 1. Precision Calibration: During the disassembly and assembly process, P' is used to calibrate the precision of tools and equipment. For example, by monitoring changes in P', the applied force of the disassembly and assembly tools is adjusted to ensure that the pressure during the disassembly and assembly process does not cause excessive damage to the cylinder components.

[0064] 2. Component Matching: Based on the measurement results of P', select appropriate replacement components. For example, when replacing seals, select seal specifications and materials that can withstand the corresponding pressure based on the pressure reflected by P'.

[0065] 3. Optimization of Disassembly and Assembly Sequence: By analyzing the changes in P' during different disassembly and assembly steps, the disassembly and assembly sequence is optimized to reduce pressure fluctuations and potential damage to the hydraulic cylinder during the disassembly and assembly process. For example, components with lower pressure are disassembled first, and the pressure is gradually released to avoid sudden pressure changes causing impact on the hydraulic cylinder.

[0066] The advantages of this data processing method are:

[0067] 1. Consider multiple factors: Traditional analysis methods usually only consider one or a few factors, while multiple regression analysis can consider multiple factors at the same time, which is more effective for solving practical problems.

[0068] 2. Improve prediction accuracy: By incorporating more independent variables, multiple regression analysis can more accurately predict the value of the dependent variable, thus providing more precise analytical results.

[0069] 3. Capturing complex relationships: It can reveal the interactions and nonlinear relationships between independent variables, which is something that traditional analysis methods cannot do in some cases.

[0070] 4. High data utilization: This method can make full use of existing data and mine information from the data by building regression models, providing stronger support for decision-making.

[0071] This data processing method is innovative:

[0072] Variable selection methods: To address the problem of multicollinearity, researchers have proposed various variable selection methods, such as stepwise regression, lasso regression, and ridge regression. These methods can help identify the most important independent variables, improving the interpretability and predictive power of the model.

[0073] Regularization techniques: Regularization techniques, such as lasso and ridge regression, avoid overfitting by penalizing the regression coefficients, thereby improving the model's generalization ability.

[0074] Deep learning integration: In recent years, the combination of deep learning and multiple regression analysis has become a research hotspot. Deep learning can automatically learn the feature representations of data, and when combined with multiple regression analysis, it can further improve the performance and prediction accuracy of the model.

[0075] High-dimensional data processing: As the amount of data increases and the dimensionality of variables rises, multiple regression analysis needs to handle high-dimensional data. Researchers have proposed several methods, such as principal component analysis and partial least squares, for dimensionality reduction and feature extraction to improve computational efficiency and model performance.

[0076] As an alternative embodiment, the infrared aiming assembly 5 has two aiming modes: circular and crosshair. The infrared aiming assembly 5 is also equipped with a universal level. Specifically, the circular laser mode is used to position the cylinder rod, and the crosshair laser mode is used to adjust and calibrate the angle between the cylinder rod and the vertical hydraulic jack. The infrared aiming assembly 5 is also equipped with a universal level. Before using the device, the infrared aiming assembly 5 is first calibrated using the universal level.

[0077] As an alternative embodiment, the monitoring controller also includes a displacement sensor 61, which is connected to the hydraulic cylinder barrel. The displacement sensor 61 is used to measure the displacement of the hydraulic cylinder. If the displacement is large, the disassembly and assembly error will be large. When the displacement is found to be too large, the cylinder position should be adjusted or the fixing device should be checked. The displacement sensor 61 has a measurement range of 0 to 50 mm and an accuracy of 0.01 mm.

[0078] As an alternative embodiment, a gas pressure gauge 4 is also included, which is connected to the hydraulic cylinder barrel; the gas pressure gauge 4 is a safety component, used during the oil sealing process to check whether the hydraulic cylinder is airtight and whether the gas pressure inside the cylinder is within the normal operating range.

[0079] As an alternative embodiment, the frame 1 is a rectangular frame structure, with multiple support beams 12 on both sides of the frame 1. Each support beam 12 has through holes for the fixed crossbeam 11 to pass through. Therefore, the height of the fixed crossbeam 11 can be adjusted so that the device can be adapted to the disassembly of various types of hydraulic cylinders.

[0080] As an alternative embodiment, the fixing component 2 is a cylindrical ring, which is fitted onto the cylinder barrel of the hydraulic cylinder. A fixing beam is provided above the crossbeam 11 on the frame 1, and the fixing beam is used to fix the tail end of the cylinder barrel of the hydraulic cylinder.

[0081] As an alternative embodiment, the control module is signal-connected to a display; the display is used to display the detection data of each sensor in real time, and at the same time to input control commands to the monitoring controller 7.

[0082] The working principle and usage method of this embodiment:

[0083] This invention provides a mobile hydraulic cylinder calibration and replacement device. When installing a hydraulic cylinder using this device, first, fix the cylinder barrel in the fixing device. After the cylinder rod is sealed, calibrate and position it using an infrared alignment device. In a vertical hydraulic jack, insert the grooved end of the pressure rod into the return valve and tighten it clockwise. Adjust the height of the adjusting screw according to the height of the hydraulic cylinder rod. Insert the jack handle into the handle sleeve. Shake the handle up and down to smoothly raise the hydraulic cylinder rod to the desired height, then push it into the cylinder barrel to complete the cylinder installation. At this point, connect the hydraulic converter to the hydraulic cylinder oil port, and connect the other end to a gas pressure gauge. The reading should be within the normal operating range of the cylinder's air pressure. After installing the hydraulic cylinder, lower the screw of the vertical hydraulic jack and rotate the return valve counterclockwise one turn. Remember to rotate slowly, and do not loosen the return valve too much, otherwise it will cause oil leakage. Disassemble the fixing device at the center of the crossbeam rod, remove the hydraulic cylinder, and remove the gas pressure gauge.

[0084] When disassembling a hydraulic cylinder using this hydraulic cylinder calibration and replacement device, first secure the cylinder to the device and use appropriate tools to remove the cylinder's connecting bolts. Next, raise the vertical hydraulic jack screw and engage it with the pin hole of the hydraulic cylinder rod. After calibration and positioning by the infrared alignment device (which includes an automatic calibration system), lower the vertical hydraulic jack. This will cause the vertical hydraulic jack screw to descend, pulling the hydraulic cylinder rod down until it is completely detached from the hydraulic cylinder barrel. During disassembly, handle the hydraulic oil inside the cylinder carefully to avoid leakage.

[0085] The above embodiments are merely specific implementations of this invention patent, used to illustrate the technical solutions of this invention patent, and not to limit it. The protection scope of this invention patent is not limited thereto. Although this invention patent has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in this invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions implemented by this invention patent, and should all be covered within the protection scope of this invention. Therefore, the protection scope of this invention patent should be determined by the protection scope of the claims.

Claims

1. A mobile hydraulic cylinder calibration and replacement device, comprising a frame (1), characterized in that, The frame (1) is provided with a fixed crossbeam (11), and also includes: A fixing component (2) is mounted on the crossbeam (11); the fixing component (2) is used to fix the hydraulic cylinder; A vertical hydraulic jack (3) is positioned directly below the hydraulic cylinder; the movable rod of the vertical hydraulic jack (3) corresponds to the rod of the hydraulic cylinder. An infrared aiming assembly (5) is mounted on a frame (1) and faces the hydraulic cylinder. The detection component includes a pressure sensor (62) and an angle sensor (63). The pressure sensor (62) is connected to the hydraulic cylinder barrel and is used to measure the pressure of the hydraulic cylinder barrel. The angle sensor (63) is connected to the hydraulic cylinder barrel and is used to measure the angle change of the hydraulic cylinder. The monitoring controller is mounted on the frame (1), and the pressure sensor (62) and angle sensor (63) are respectively connected to the monitoring controller for signal transmission.

2. The mobile hydraulic cylinder calibration and replacement device as described in claim 1, characterized in that, The monitoring controller includes a control module and a data processing module. The infrared calibration component (5) is signal-connected to the control module. The control module and the data processing module are signal-connected. The pressure sensor (62) and the angle sensor (63) are signal-connected to the data processing module respectively. The data processing module stores the normal range threshold of the measured parameter P'. The data processing module has a built-in automatic calibration algorithm for calculating the measured parameter P'. The pressure sensor (62) outputs a voltage U that represents pressure information; The angle sensor (63) outputs a voltage Ut that represents angle information; The measured parameter P′ can be represented by a bivariate function of U and Ut, that is: P'=f(U,U t Pi, determined by two-dimensional coordinates (Ui, Uit), lies on the same plane and can be described by a two-dimensional regression equation: P'=a0+a1U+a2Ut+a3U2+a4UUt+a5U2t+ε1; In the formula: a0~a5 are constant coefficients; ε1 is a higher-order infinitesimal; The coefficients a0 to a5 are obtained by the least squares method. They are substituted into the two-dimensional regression equation to determine the binary input-output characteristics of the measured parameter P' and the output U. When the output values ​​U and Ut of the two sensors are collected, they can be substituted into the equation to calculate the measured parameter P' of the sensor. The data processing module is used to compare the obtained measured parameter P' with the stored normal range threshold of the measured parameter P'. If the obtained measured parameter P' exceeds the normal threshold, the data processing module sends information to the control module, and the control module issues a warning message based on the information sent by the data processing module.

3. The mobile hydraulic cylinder calibration and replacement device as described in claim 1, characterized in that, The infrared aiming assembly (5) has two aiming modes: circular and crosshair. The infrared aiming assembly (5) is also equipped with a universal level.

4. The mobile hydraulic cylinder calibration and replacement device as described in claim 1, characterized in that, The monitoring controller also includes a displacement sensor (61), which is connected to the hydraulic cylinder barrel.

5. The mobile hydraulic cylinder calibration and replacement device as described in claim 1, characterized in that, It also includes a gas pressure gauge (4), which is connected to the hydraulic cylinder barrel.

6. The mobile hydraulic cylinder calibration and replacement device as described in claim 1, characterized in that, The frame (1) is a rectangular frame structure. Multiple support beams (12) are provided on both sides of the frame (1). Each support beam (12) has a through hole for the fixed crossbeam (11) to pass through.

7. The mobile hydraulic cylinder calibration and replacement device as described in claim 1, characterized in that, The fixing component (2) is a cylindrical ring, which is fitted onto the cylinder of the hydraulic cylinder. A fixing beam is provided above the crossbeam (11) of the frame (1), and the fixing beam is used to fix the tail of the cylinder of the hydraulic cylinder.

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