A cold shearing crankshaft copper bush gap measuring system and method

Abstract

The application provides a cold shearing crankshaft copper bush gap measuring system and method, the system comprises: a displacement detection assembly arranged at the top opening of the cold shearing device, the detection end of the displacement detection assembly extends downward and abuts against the upper surface of the crankshaft of the cold shearing device; a lifting assembly arranged between the slide and the frame of the cold shearing device; the lifting assembly pushes the slide upward to drive the whole crankshaft to move upward until the top of the outer ring of the crankshaft is blocked by the top of the inner ring of the copper bush; the displacement detection assembly is configured to obtain the vertical displacement data of the crankshaft in the state that the top of the inner ring of the copper bush is blocked by the top of the outer ring of the crankshaft. The application breaks the internal space limitation of the cold shearing, and the measuring method is simple and reliable; the safety risk hidden danger caused by manual caliper measuring is reduced, and the incompleteness and inaccuracy of the measured data are reduced.

Description

Technical Field

[0001] This invention relates to the field of metallurgical rolling mill equipment maintenance technology, and in particular to a system and method for measuring the clearance of copper bushings in cold shear crankshafts. Background Technology

[0002] The cold shearing equipment in a steel rolling mill is a crucial piece of equipment in the finishing area, and the fit between its crankshaft and bushing directly affects the stable operation of the equipment. Under long-term alternating loads, wear will occur between the crankshaft and bushing, leading to a gradual increase in the clearance.

[0003] To monitor the operating conditions of the cold shear equipment and perform preventative maintenance, it is necessary to periodically measure the wear clearance between the crankshaft and the bushing. This wear clearance refers to the clearance value between the crankshaft and the outer bushing caused by wear under natural static conditions.

[0004] In existing technology, the crankshaft driven end cap is usually removed, and then the operator uses a feeler gauge to measure the gap between the brass bushing and the crankshaft. However, the drive-side brass bushing and connecting rod brass bushing inside the cold shearing equipment are deeply embedded in the equipment, and the space is extremely limited, making it impossible to measure without disassembly; furthermore, the measurement results obtained by using a feeler gauge may still be inaccurate. Summary of the Invention

[0005] This invention provides a system and method for measuring the clearance of copper bushings on a cold shear crankshaft, making it more convenient and accurate to measure the wear of copper bushings on the crankshaft of a cold shearing device without disassembly.

[0006] On one hand, the present invention provides a cold-shear crankshaft copper bushing clearance measurement system, comprising:

[0007] A displacement detection component is disposed at the top opening of the cold shearing equipment, and the detection end of the displacement detection component extends downward and abuts against the upper surface of the crankshaft of the cold shearing equipment. A lifting assembly is disposed between the bottom surface of the slide of the cold shearing equipment and the frame; the lifting assembly is configured to push the slide upward to drive the crankshaft connected to the slide to move upward as a whole until the top of the outer ring of the crankshaft is blocked from contacting the top of the inner ring of the copper sleeve. The displacement detection component is configured to acquire vertical displacement data of the crankshaft when the top of the inner ring of the copper bushing is obstructed from contact with the top of the outer ring of the crankshaft.

[0008] In one embodiment of the present invention, the displacement detection component is a dial indicator, and the measuring head of the dial indicator is perpendicularly downward and tangentially contacts the highest point of the upper surface of the crankshaft.

[0009] In one embodiment of the present invention, the lifting component is a hydraulic jack, which is vertically disposed between the slide and the frame.

[0010] In one embodiment of the present invention, the hydraulic jack is located at the very center of the bottom of the slide.

[0011] On the other hand, the present invention also provides a method for measuring the clearance of cold-sheared crankshaft copper bushings, applied to the aforementioned cold-sheared crankshaft copper bushing clearance measuring system, comprising: A displacement detection component is arranged at the top opening of the cold shearing equipment, with the detection end of the displacement detection component pointing downwards and abutting against the upper surface of the crankshaft, thus establishing an initial measurement reference. A lifting assembly is arranged between the bottom surface of the carriage and the frame of the cold shear equipment; The lifting assembly is operated to push the slide upward, causing the crankshaft connected to the slide to move upward as a whole until the top of the outer ring of the crankshaft is blocked from contacting the top of the inner ring of the copper sleeve; The vertical displacement data displayed by the displacement detection component when the lifting is obstructed is obtained, and the vertical displacement data is used as the wear clearance of the copper sleeve.

[0012] In one embodiment of the present invention, in the step of arranging a displacement detection component at the top opening of the cold shearing equipment, a dial indicator is provided at the inspection hole at the upper end of the cold shearing equipment, such that the measuring head of the dial indicator is vertically downward and the measuring head is tangentially contacting the highest point of the upper surface of the crankshaft.

[0013] In one embodiment of the present invention, in the step of arranging a lifting assembly between the bottom surface of the slide of the cold shearing equipment and the frame, a hydraulic jack is vertically arranged between the bottom surface of the slide and the fixed platform of the frame, and the hydraulic jack is located at the center of the bottom of the slide.

[0014] In one embodiment of the present invention, a hydraulic jack with a rated lifting tonnage greater than the sum of the weights of the components being lifted is selected based on the total weight of the crankshaft and the other linkage components.

[0015] In one embodiment of the present invention, after acquiring the vertical displacement data displayed by the displacement detection component when the lifting is obstructed, and using the vertical displacement data as the wear gap of the copper sleeve, the method further includes comparing the wear gap of the copper sleeve with a preset value, and replacing the copper sleeve if the wear gap exceeds the preset value.

[0016] In one embodiment of the present invention, in the step of obtaining the vertical displacement data displayed by the displacement detection component under the state of obstructed lifting, the readings of the displacement detection component are recorded multiple times during the lifting and lowering process, and the average value is recorded as the wear gap of the copper sleeve.

[0017] The beneficial effects of this invention are as follows: The cold shear crankshaft copper bushing clearance measurement system and method proposed in this invention breaks through the internal space limitations of the cold shear, and the measurement method is simple and reliable; it reduces the safety risks and hidden dangers caused by manual feeler gauge measurement, as well as the incompleteness and inaccuracy of measurement data. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0019] In the attached diagram: Figure 1 This is a schematic diagram of the structure of a cold-shear crankshaft copper bushing clearance measurement system provided in an embodiment of the present invention.

[0020] The attached figures are labeled as follows: 1. Carriage, 2. Frame, 3. Connecting rod, 4. Crankshaft, 5. Copper sleeve, 6. Dial indicator, 7. Magnetic gauge base, 8. Universal rocker arm, 9. Hydraulic jack, 10. Inspection hole. Detailed Implementation

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0022] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0023] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0024] In the cold shearing equipment of a steel rolling mill, there is a slide carriage with a connecting rod mounted on it. The crankshaft is sleeved inside the connecting rod, and a copper bushing is fitted between the connecting rod and the crankshaft. After a period of use, the copper bushing will wear, and a gap will appear between the copper bushing and the crankshaft. Under natural static conditions, due to the downward pull of gravity, the lower half of the copper bushing is in close contact with the crankshaft, and the wear gap is concentrated entirely in the upper part of the copper bushing.

[0025] like Figure 1 As shown, the present invention provides a cold shear crankshaft copper bushing clearance measurement system, including a displacement detection component and a lifting component. The displacement detection component and the lifting component are installed inside the cold shearing equipment. The displacement detection component measures the clearance between the copper bushing 5 and the crankshaft 4 inside the cold shearing equipment.

[0026] The displacement detection component is located at the top opening of the cold shearing equipment, with its detection end extending downward and abutting against the upper surface of the crankshaft 4.

[0027] The lifting assembly is located between the bottom surface of the slide 1 of the cold shearing equipment and the frame 2. The lifting assembly is configured to push the slide 1 upward, thereby causing the crankshaft 4 connected to the slide 1 to move upward as a whole until the top of the inner ring of the copper sleeve 5 is blocked from contacting the top of the outer ring of the crankshaft 4.

[0028] The displacement detection component is configured to acquire vertical displacement data of the crankshaft 4 when the top of the inner ring of the copper bushing 5 is in contact with and obstructed contact with the top of the outer ring of the crankshaft 4. This vertical displacement data accurately characterizes the wear clearance of the copper bushing 5. The cold-shear crankshaft copper bushing clearance measurement system completely breaks through the internal space limitations of cold-shear equipment, realizing a measurement method without opening the cover or disassembling the machine.

[0029] In some embodiments, such as Figure 1 As shown, the top opening of the cold shearing device is specifically a viewing hole 10. The displacement detection assembly includes a dial indicator 6, whose measuring head is vertically downward and tangentially contacts the highest point of the upper surface of the crankshaft 4.

[0030] The existing viewing port 10 of the cold shearing equipment is cleverly utilized, eliminating the need for destructive modifications to the equipment. The dial indicator 6, as a high-precision contact measuring instrument, can sensitively capture minute displacement changes.

[0031] The measuring head makes tangential contact with the highest point of crankshaft 4, ensuring that the measured displacement direction is completely collinear with the lifting direction. This high-precision displacement detection replaces physical insertion, eliminating the cumulative errors caused by the stacking of multiple feeler gauges and human touch, resulting in more accurate measurement data.

[0032] In some embodiments, the displacement detection assembly further includes a magnetic base 7 and a universal rocker arm 8. The magnetic base 7 is magnetically fixed to one vertical wall inside the viewing hole 10, and the dial indicator 6 is connected to the magnetic base 7 via the universal rocker arm 8. The viewing hole 10 has a narrow interior space and is mostly composed of vertical metal walls; the magnetic base 7 provides strong magnetic attraction, enabling quick, stable, and non-destructive installation. The universal rocker arm 8 provides multi-degree-of-freedom spatial attitude adjustment capabilities. Operators can flexibly adjust the joints of the universal rocker arm 8 to precisely align the measuring head of the dial indicator 6 with the highest point of the crankshaft 4, greatly facilitating installation and positioning in confined spaces.

[0033] In some embodiments, the lifting assembly includes a hydraulic jack 9, which is vertically disposed between the bottom surface of the slide 1 and the fixed platform of the frame 2. The lifting assembly can also be an electric lifting assembly, as long as it can lift the slide 1 upward.

[0034] In this embodiment, since the total weight of the slide 1, crankshaft 4 and connecting rod 3 of the cold shear equipment is huge, conventional electric lifting components are difficult to overcome its gravity. Therefore, hydraulic jack 9 is used as the lifting component. Hydraulic jack 9 can output huge vertical lifting force with a small operating force.

[0035] The hydraulic jack 9 is vertically positioned between the bottom frame 2 and the slide 1, which can provide stable, smooth and controllable lifting power, effectively overcoming the huge weight of the slide 130 and the connecting rod 3, and forcing the gravity gap to shift.

[0036] In some embodiments, the hydraulic jack 9 is positioned at the exact center of the bottom of the slide 1. The slide 1 is a large, heavy component; if the lifting force point is off-center, it can easily cause the slide 1 to tilt, jam, or even slip during lifting, potentially leading to the hydraulic jack 9 slipping off. Positioning the force point at the exact center ensures that the slide 1 is balanced in the vertical direction. This ensures that the jacking force can be transmitted vertically upwards, allowing the connecting rod 3 and crankshaft 4 to move smoothly upwards, avoiding interference from lateral forces on measurement accuracy.

[0037] On the other hand, the present invention provides a method for measuring the clearance of a cold-sheared crankshaft copper bushing, comprising the following steps: S01. Arrange a displacement detection component at the top opening of the cold shearing equipment, so that the detection end of the displacement detection component abuts against the upper surface of the crankshaft 4, and establish an initial measurement reference.

[0038] Specifically, a dial indicator 6 is installed at the inspection hole 10 at the top of the cold shearing equipment. The dial indicator 6 is adjusted so that its measuring head is vertically downward and tangentially contacts the highest point of the upper surface of the crankshaft 4. This step establishes the precise contact point for displacement capture, using the high-precision displacement detection of the dial indicator 6 to replace traditional physical insertion measurement, fundamentally eliminating the cumulative errors caused by the stacking of multiple feeler gauges and human touch.

[0039] The displacement detection assembly also includes a rocker arm fixedly connected to the dial indicator 6. The rocker arm allows the dial indicator 6 to be positioned. A magnetic base is connected to the other end of the rocker arm, which allows the dial indicator 6 to be installed in any fixed position. During the arrangement of the displacement detection assembly, to achieve stable installation, the magnetic base 7 is magnetically attached to one side of the vertical wall inside the viewing hole 10. The measuring head is positioned by adjusting the universal rocker arm 8 of the dial indicator 6. This invention fully utilizes the inherent steel material properties of the cold shearing equipment, facilitating rapid installation of the base within the narrow and deep viewing hole 10, and allowing flexible adjustment of the spatial position of the base and measuring head, greatly improving the efficiency of the detection preparation work.

[0040] The specific steps for establishing the initial measurement benchmark are as follows: Rotate the dial of dial indicator 6 until the pointer is aligned with zero. Once the measuring head stably contacts the highest point of crankshaft 4, the operator rotates the outer ring of the dial to align the zero mark with the current pointer position. This establishes the absolute starting point for displacement change. During subsequent jacking, the reading of the pointer deviating from zero is the intuitive displacement amount, allowing operators to quickly and accurately read the data and avoiding complex numerical conversions.

[0041] S02. A lifting assembly is arranged between the bottom surface of the slide 1 of the cold shearing equipment and the frame 2. The lifting assembly is operated to push the slide 1 upward, causing the crankshaft 4 connected to the slide 1 to move upward as a whole until the top of the outer ring of the crankshaft 4 is blocked from contacting the top of the inner ring of the copper sleeve 5.

[0042] In this embodiment, the lifting assembly uses a hydraulic jack 9, which is vertically installed between the bottom surface of the slide 1 and the fixed platform of the frame 2. The operator enters the safe area at the bottom of the cold shear equipment. The hydraulic jack 9 is placed vertically, ensuring that the extension direction of its piston rod is collinear with the direction of gravity. This provides a stable, controllable, and accurately directional lifting power source for overcoming the gravity of the components.

[0043] When placing the hydraulic jack 9, try to keep it in the exact center of the bottom of the slide 1. This ensures that the lifting force is evenly distributed on the bottom surface of the slide 1, preventing tilting or twisting during the lifting process, ensuring pure vertical movement during the gap elimination process, and guaranteeing the accuracy and safety of the measurement.

[0044] When selecting the model of hydraulic jack 9, first calculate the total weight of crankshaft 4 and the components linked to crankshaft 4, and select the hydraulic jack 9 with a rated lifting tonnage greater than the sum of the weights of the components to be lifted, where the sum of the weights of the components to be lifted is the calculated total weight.

[0045] The hydraulic jack 9 can be equipped with either a manual or automatic hydraulic pump, and its lifting process is controlled by hydraulic valves. The operator is positioned in a safe area at the bottom and pumps hydraulic oil into the cylinder of the hydraulic jack 9 by controlling the hydraulic valves.

[0046] By precisely adjusting the hydraulic valves, the piston rod of the hydraulic jack 9 can be controlled to extend upwards slowly and at a constant speed.

[0047] S03. Obtain the vertical displacement data displayed by the displacement detection component when the lifting is obstructed, and use this vertical displacement data as the wear clearance of the copper sleeve 5140. The measurement method provided by this invention avoids the safety hazards of high-altitude disassembly and manual feeler gauge measurement, and realizes high-precision, full-coverage in-situ preventive detection.

[0048] The data displayed by the displacement detection component is the gap between the copper sleeve 5 and the crankshaft 4, which is the wear gap of the copper sleeve 5. In order to make the data more accurate, the crankshaft 4 can be raised and lowered multiple times, and the data of each raising can be recorded. The average value is recorded as the wear gap of the copper sleeve 5.

[0049] After obtaining the wear clearance between the copper bushing 5 and the crankshaft 4, the method further includes comparing the wear clearance of the copper bushing 5 with a preset value. If the wear clearance exceeds the preset value, the copper bushing 5 is replaced.

[0050] This invention solves the industry problem that previously required large-scale disassembly of the cold shearing equipment during maintenance in order to measure the wear clearance of the copper sleeve 5, and enables rapid detection during normal downtime.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A system for measuring the clearance of a cold-sheared crankshaft copper bushing, characterized in that, include: A displacement detection component is disposed at the top opening of the cold shearing equipment, and the detection end of the displacement detection component extends downward and abuts against the upper surface of the crankshaft of the cold shearing equipment. A lifting assembly is disposed between the bottom surface of the slide of the cold shearing equipment and the frame; the lifting assembly is configured to push the slide upward to drive the crankshaft connected to the slide to move upward as a whole until the top of the outer ring of the crankshaft is blocked from contacting the top of the inner ring of the copper sleeve. The displacement detection component is configured to acquire vertical displacement data of the crankshaft when the top of the inner ring of the copper bushing is obstructed from contact with the top of the outer ring of the crankshaft.

2. The cold-shear crankshaft copper bushing clearance measurement system according to claim 1, characterized in that: The displacement detection component is a dial indicator, and the measuring head of the dial indicator is perpendicularly downward and tangentially contacts the highest point of the upper surface of the crankshaft.

3. The cold-shear crankshaft copper bushing clearance measurement system according to claim 1, characterized in that: The lifting assembly is a hydraulic jack, which is vertically installed between the slide and the frame.

4. The cold-shear crankshaft copper bushing clearance measuring system according to claim 3, characterized in that: The hydraulic jack is located in the exact center of the bottom of the slide.

5. A method for measuring the clearance of a cold-sheared crankshaft copper bushing, characterized in that, The cold-shear crankshaft copper bushing clearance measurement system according to any one of claims 1-4 includes: A displacement detection component is arranged at the top opening of the cold shearing equipment, with the detection end of the displacement detection component pointing downwards and abutting against the upper surface of the crankshaft, thus establishing an initial measurement reference. A lifting assembly is arranged between the bottom surface of the slide of the cold shearing equipment and the frame; the lifting assembly is operated to push the slide upward, causing the crankshaft connected to the slide to move upward as a whole until the top of the outer ring of the crankshaft is blocked from contacting the top of the inner ring of the copper sleeve; The vertical displacement data displayed by the displacement detection component when the lifting is obstructed is obtained, and the vertical displacement data is used as the wear clearance of the copper sleeve.

6. The method for measuring the clearance of a cold-sheared crankshaft copper bushing according to claim 5, characterized in that: In the step of arranging the displacement detection component at the top opening of the cold shearing equipment, a dial indicator is installed at the inspection hole at the upper end of the cold shearing equipment, with the measuring head of the dial indicator pointing vertically downward and the measuring head tangentially contacting the highest point of the upper surface of the crankshaft.

7. The method for measuring the clearance of a cold-sheared crankshaft copper bushing according to claim 5, characterized in that: In the step of arranging the lifting assembly between the bottom surface of the slide and the frame of the cold shearing equipment, a hydraulic jack is vertically installed between the bottom surface of the slide and the fixed platform of the frame, and the hydraulic jack is located at the center of the bottom of the slide.

8. The method for measuring the clearance of a cold-sheared crankshaft copper bushing according to claim 7, characterized in that: Based on the total weight of the crankshaft and other linked components, select a hydraulic jack with a rated lifting tonnage greater than the sum of the weights of the components to be lifted.

9. The method for measuring the clearance of a cold-sheared crankshaft copper bushing according to claim 5, characterized in that: After acquiring the vertical displacement data displayed by the displacement detection component when the lifting is obstructed, and using the vertical displacement data as the wear gap of the copper sleeve, the method further includes comparing the wear gap of the copper sleeve with a preset value. If the wear gap exceeds the preset value, the copper sleeve is replaced.

10. The method for measuring the clearance of a cold-sheared crankshaft copper bushing according to claim 5, characterized in that: In the step of obtaining the vertical displacement data displayed by the displacement detection component under the state of obstructed lifting, the readings of the displacement detection component are recorded multiple times during the lifting and lowering process, and the average value is recorded as the wear gap of the copper sleeve.

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