A device for measuring the wear of a coal mill roller

Abstract

A wear measurement device for a coal mill roller includes a measuring arc plate, a clamping component, a positioning plate, and a fixed rail. The measuring arc plate is located on the outer side of the roller, and a measuring area is provided in the middle of the arc plate. The clamping component is installed at both ends of the measuring arc plate. The positioning plate is movably installed on the measuring area, and a primary rangefinder is installed at the front end of the positioning plate, while a secondary rangefinder is installed on the positioning plate. The fixed rail is provided with an arc-shaped rail that matches the outer side of the roller and multiple transverse rails that are connected to the arc-shaped rail and face the outer side of the roller. The positioning plate is provided with a moving component that can restrict movement within the fixed rail. This invention can use the primary rangefinder to determine the transverse rails to be measured and the wear area to be measured, avoiding inaccurate wear measurement due to human error in position judgment. By using the secondary rangefinder to measure the actual wear of the wear area to be measured, the wear degree of the roller can be judged more accurately.

Description

Technical Field

[0001] This utility model relates to the field of measuring device technology, and in particular to a device for measuring the wear of a coal mill roller. Background Technology

[0002] Thermal power plants transport raw coal to medium-speed coal mills via a coal conveying system. The mill's grinding disc rotates via a motor, and the rotation of the grinding disc drives three grinding rollers to rotate 120°, grinding the raw coal into pulverized coal for combustion. Since the grinding rollers are the direct grinding bodies, their wear is significant, and excessive wear can increase the vibration of the coal mill, thus affecting its safe and stable operation. Therefore, it is necessary to replace or weld over the worn grinding rollers.

[0003] Current technology for measuring the wear of grinding roller sleeves often uses the original manufacturer's positioning plate. However, the positioning plate is merely the outer shape of the grinding roller sleeve and cannot accurately measure the wear of the grinding roller. The wear can only be visually inspected or compared with a ruler, which results in a large error compared with the actual wear of the grinding roller. This makes it difficult for technicians to accurately judge the wear of the grinding roller sleeve and replace or weld the grinding roller.

[0004] Existing patent CN220708262U describes a measuring ruler for the wear of a medium-speed coal mill roller. A scale is mounted on the outer plate, and the measuring head of the scale can move linearly along the axis of symmetry of the positioning groove. Moving the scale causes the measuring head to contact the wear recess of the roller. The distance the measuring head travels from the edge of the positioning groove to the wear recess of the roller can be determined via the scale, which represents the wear amount. While this patent simplifies the measurement, the unevenness of wear (the wear amount around the roller at the same radial position will differ, and the wear amount at different heights will also differ) necessitates manual judgment of the most severely worn locations for measurement; otherwise, it cannot accurately reflect the wear amount of the roller. Therefore, a roller wear measuring device is needed that can predict the wear amount of the roller and then determine the actual wear amount through precise measurement, thereby avoiding inaccurate measurements of roller wear. Utility Model Content

[0005] To address the aforementioned problems, this utility model proposes a device for measuring the wear of coal mill grinding rollers. The specific technical solution is as follows:

[0006] A device for measuring the wear of a coal mill roller, comprising:

[0007] A measuring arc plate is located on the outer side of the grinding roller. Both ends of the measuring arc plate extend to the two ends of the grinding roller, and a measuring area is provided in the middle of the measuring arc plate.

[0008] The clamping components are installed at both ends of the measuring arc plate and clamp the sides of the grinding rollers that travel along them.

[0009] A positioning plate, movably mounted on the measurement area, has a primary rangefinder mounted on its front end and a secondary rangefinder mounted on it; and

[0010] The fixed rail is provided with an arc-shaped rail that matches the outer side of the grinding roller and multiple transverse rails that are connected to the arc-shaped rail and face the outer side of the grinding roller. The positioning plate is provided with a movable component that can restrict movement within the fixed rail.

[0011] Furthermore, the clamping component includes a clamping frame and a caster wheel installed at the bottom of the clamping frame. The top of the clamping frame is laterally movable and connected to the end of the measuring arc plate. The caster wheel is pressed against the end side of the grinding roller.

[0012] Furthermore, both ends of the measuring arc plate are provided with inward moving grooves, and multiple sets of slots are provided side by side in the moving grooves. The clamping frame is provided with an adjusting column that can move in the moving grooves, and multiple pairs of elastic protrusions that can be inserted into the slots are symmetrically provided on the adjusting column.

[0013] Furthermore, a clamping spring connected to the top of the caster wheel is installed inside the clamping frame.

[0014] Furthermore, the movable component includes a movable plate, a movable bolt connected to the movable plate, and a locking cap. The movable plate is movably disposed within the fixed rail, and the movable bolt extends through the top surface of the positioning plate and is threadedly connected to the locking cap.

[0015] Furthermore, three transverse rails are provided, which are respectively connected to the middle and both ends of the arc-shaped rail.

[0016] Furthermore, the single-ranger is an infrared rangefinder, which includes at least an infrared transmitting unit, a receiving unit, and a phase measuring unit.

[0017] Furthermore, the secondary rangefinder is a capacitive grating digital display scale, which includes a vernier. The vernier is movably embedded in the positioning plate. The vernier is provided with a capacitive grating chip with a moving grating. The vernier is provided with a display screen electrically connected to the capacitive grating chip. The positioning plate is provided with a fixed grating that works in conjunction with the moving grating.

[0018] Furthermore, the phase measuring unit is electrically connected to the display screen.

[0019] Furthermore, the front end of the positioning plate is provided with a limiting block for restricting the movement of the cursor, and the rear end of the cursor is provided with a limiting member for restricting its movement.

[0020] Beneficial effects:

[0021] This invention can use a primary rangefinder to predict the wear amount in the middle and both sides of the outer circumference of the grinding roller, making it easier to select values ​​with larger predicted wear amounts, determine the transverse rail to be measured and the wear area to be measured, and avoid inaccurate wear measurement due to human judgment position errors; by using a secondary rangefinder to measure the actual wear amount in the wear area to be measured, the wear degree of the grinding roller can be judged more accurately, so that the grinding roller can be reused, replaced or welded. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0023] Figure 2 This is a schematic diagram of the clamping component of this utility model.

[0024] Figure 3 This utility model Figure 1 Enlarged diagram of point A in the middle.

[0025] In the diagram: 1. Measuring arc plate, 11. Measuring area, 12. Slot; 2. Clamping component, 21. Clamping frame, 22. Caster wheel, 23. Adjusting column, 24. Elastic protrusion, 25. Clamping spring; 3. Positioning plate, 31. Vernier, 32. Display screen, 33. Fixed grid, 34. Limiting block, 35. Insert rod; 4. Fixed rail, 41. Arc rail, 42. Transverse rail; 5. Moving component, 51. Moving bolt, 52. Locking cap; 6. Infrared rangefinder; 7. Grinding roller. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] like Figures 1 to 3 As shown, a wear measurement device for a coal mill roller includes a measuring arc plate 1, a clamping element 2, a positioning plate 3, and a fixed rail 4; wherein:

[0030] The measuring arc plate 1 is located on the outer side of the grinding roller 7. Both ends of the measuring arc plate 1 extend to the two ends of the grinding roller 7, and a measuring area 11 is provided in the middle of the measuring arc plate 1.

[0031] The clamping member 2 is installed at both ends of the measuring arc plate 1 and clamps the two sides of the grinding roller 7, so that the measuring arc plate 1 can rotate around the outer ring of the grinding roller 7.

[0032] The positioning plate 3 is movably installed on the measuring area 11. A primary rangefinder is installed at the front end of the positioning plate 3 to predict the wear of the grinding roller 7. A secondary rangefinder is installed on the positioning plate 3 to precisely measure the wear of the grinding roller 7 to determine the wear at the most severely worn position of the grinding roller 7.

[0033] The fixed rail 4 is provided with an arc-shaped rail 41 that matches the outer side of the grinding roller 7 and multiple transverse rails 42 that are connected to the arc-shaped rail 41 and face the outer side of the grinding roller 7. The positioning plate 3 is provided with a movable part 5 that can restrict movement within the fixed rail 4.

[0034] Specifically, the curvature of the arc-shaped rail 41 matches the outer surface of the grinding roller 7, so that when the positioning plate 3 moves within the arc-shaped rail 41, the distance measured by the distance measuring instrument at the initial position of the positioning plate 3 at different positions of the arc-shaped rail 41 is consistent with the distance to the outer surface of the unworn grinding roller 7, that is, the initial distance S0.

[0035] The clamping member 2 travels along both ends of the grinding roller 7, and can drive the measuring arc plate 1 to rotate around the outer surface of the grinding roller 7. When the positioning plate 3 is moved to the position of the arc-shaped rail 41 opposite the transverse rail 42, the measuring arc plate 1 is rotated to allow the rangefinder to predict the wear amount of the grinding roller 7, so as to detect the wear condition of the outer surface of the grinding roller 7 at different positions on the same arc, that is, to predict the wear amount S. n (n=1,2,3…).

[0036] When using the primary rangefinder, the secondary rangefinder remains inactive. At this time, the front end of the positioning plate 3 is aligned with the outer surface of the unworn grinding roller 7, i.e., the zero-point distance L0, where L0 = S0. The positioning plate 3 is moved along the transverse rail 42 towards the grinding roller 7 until its front end abuts against the outer surface of the grinding roller 7. Then, the secondary rangefinder is used to accurately measure the wear data of the grinding roller 7, i.e., the precise wear amount L. n Therefore, the actual wear of grinding roller 7 is L = L n -L0.

[0037] like Figure 2 As shown, the clamping member 2 includes a clamping frame 21 and a caster wheel 22 installed at the bottom of the clamping frame 21. The top of the clamping frame 21 is laterally movable and connected to the end of the measuring arc plate 1. The caster wheel 22 is pressed against the end side of the grinding roller 7.

[0038] In one embodiment, both ends of the measuring arc plate 1 are provided with inward moving grooves, and multiple sets of slots are provided side by side in the moving grooves. The clamping frame 21 is provided with an adjusting column 23 that can move in the moving grooves, and multiple pairs of elastic protrusions 24 that can be inserted into the slots are symmetrically provided on the adjusting column 23.

[0039] The elastic protrusion 24 on the adjusting column 23 can be inserted into the slot to fix the position of the clamping frame 21. When a certain force is applied, the elastic protrusion 24 can be moved out of the slot and squeezed, and the adjusting column 23 can be adjusted in the moving groove to adjust the clamping frame 21 to a suitable position so that the two universal wheels 22 can move stably on the two ends of the grinding roller 7.

[0040] In another embodiment, a compression spring 25 connected to the top of the caster wheel 22 is installed inside the clamping frame 21. The compression spring 25 applies elastic force to the disc surface at the top of the caster wheel 22. After the clamping frame 21 is adjusted, the caster wheel 22 can always remain pressed against the two ends of the grinding roller 7 when moving, thereby ensuring the accuracy of the measurements of the primary and secondary rangefinders.

[0041] like Figure 1 , 3 As shown, the movable component 5 includes a movable plate, a movable bolt 51 connected to the movable plate, and a locking cap 52. The movable plate is movably disposed within the fixed rail 4, and the bolt extends through the top surface of the positioning plate 3 and is threadedly connected to the locking cap 52.

[0042] In one embodiment, the movable plate is a flat circular plate, and the arc-shaped rail 41 and the transverse rail 42 are dovetail grooves or similar grooves that allow the movable plate to move within them but not outwards. One end of the movable bolt 51 is connected to the middle of the movable plate, and the diameter of the movable bolt 51 matches the outer opening of the arc-shaped rail 41 and the transverse rail 42. When the locking cap 52 is tightened (pressed onto the positioning plate 3), the movable plate can be lifted using the movable bolt 51 to press it into the fixed rail 4, thereby fixing the position of the positioning plate 3 for easy measurement. When the locking cap 52 is loosened, the movable plate will be released, allowing it to move within the fixed rail 4 to adjust the position of the positioning plate 3.

[0043] In another embodiment, the transverse rail 42 is provided in three sections, which are respectively connected to the middle and both ends of the arc-shaped rail 41.

[0044] Typically, the middle and near-middle sections of the outer surface of the grinding roller 7 are the areas where wear is most severe, and increased wear will cause greater vibration in the coal mill. Therefore, three transverse rails 42 are provided to detect the wear amount in the middle and on both sides of the outer surface of the grinding roller 7, respectively, so as to more accurately assess the wear amount of the grinding roller 7.

[0045] Therefore, the positioning plate 3 is moved to the position of the arc-shaped rail 41 opposite the three transverse rails 42. The wear amount in the middle and the wear amount on both sides of the outer side of the grinding roller 7 are measured by the first distance measuring instrument. This allows the area with the most severe wear to be identified. Then, the maximum wear amount is measured by the second distance measuring instrument, which makes it easier to determine whether to replace or repair the grinding roller 7 by welding.

[0046] Preferably, to ensure the stability of the positioning plate 3 during movement and measurement, two sets of fixed rails 4 and moving parts 5 are provided respectively, and the two moving bolts 51 can restrict the rotation of the positioning plate 3.

[0047] like Figure 1 As shown, the primary rangefinder is an infrared rangefinder 6, which includes at least an infrared transmitting unit, a receiving unit, and a phase measuring unit. The infrared transmitting unit is installed inside the front end of the positioning plate 3 and emits light through an opening to the outer surface of the grinding roller 7. The infrared receiving unit and phase measuring unit then work together to calculate the distance S. n .

[0048] Specifically, a control unit and a wireless module can be integrated into the phase measuring unit. The control unit controls the transmission frequency of the infrared transmitting unit so that the infrared rangefinder 6 measures the predicted wear amount according to the frequency, i.e., S1, S2, S3…S… n Meanwhile, the control unit records the predicted wear data of the middle and both sides of the outer surface of the grinding roller 7, and transmits this data to the receiving terminal via a wireless module, where the receiving terminal processes and analyzes the data.

[0049] The infrared rangefinder 6 measures distance based on frequency. The data obtained to predict the wear amount is from discontinuous positions on the grinding roller 7 and is related to the rotation speed of the measuring arc plate 1 and the infrared emission frequency. Therefore, a secondary rangefinder is needed for secondary confirmation and accurate measurement.

[0050] like Figure 1 , 3 As shown, the secondary rangefinder is a capacitive grating digital display scale, which includes a vernier 31. The vernier 31 is movably embedded in the positioning plate 3. The vernier 31 is provided with a capacitive grating chip with a moving grating. The vernier 31 is provided with a display screen 32 that is electrically connected to the capacitive grating chip. The positioning plate 3 is provided with a fixed grating 33 that works in conjunction with the moving grating.

[0051] Specifically, the vernier 31 is also equipped with a switch button, a zeroing button, an input button for the zero-point distance L0, and a battery compartment. The input button is used to input the value of the zero-point distance L0, which can be written into the capacitance chip to transmit the measured precise wear amount L. n After subtracting the zero-point distance L0, the actual wear amount is directly displayed as L on the display screen 32.

[0052] Based on the data analysis of the receiving terminal, one or more values ​​with larger predicted wear are selected to determine which transverse rail 42 corresponds to this position. This transverse rail 42 is the transverse rail 42 to be measured. Then, a rangefinder is used to determine the wear area to be measured corresponding to these larger values, and a secondary rangefinder is used to finally measure the precise wear amount of the wear area to be measured.

[0053] Preferably, the phase measuring unit is electrically connected to the display screen 32, and the predicted wear amount calculated and measured by the phase measuring unit will be displayed on the display screen 32 in real time, so as to facilitate the verification of the wear area to be measured with the larger value selected.

[0054] In one embodiment, the front end of the positioning plate 3 is provided with a limiting block 34 for restricting the movement of the vernier 31, and the rear end of the vernier 31 is provided with a limiting member for restricting its movement.

[0055] Specifically, the limiting component is a rod 35 that can slide on the vernier 31 towards the measuring area 11. The measuring area 11 has three slots 12 corresponding to the positions of the transverse rail 42. When the rod 35 is inserted into the slot 12, the movement of the vernier 31 is restricted. When measuring with a single-range meter, the rod 35 is inserted into the slot 12, and the positioning plate 3 is held, so that the limiting block 34 on the positioning plate 3 is pressed tightly against the vernier 31, thereby avoiding measurement errors.

[0056] After locating the wear area to be measured, the precise wear amount L of the grinding roller 7 is measured using a secondary rangefinder.n Specifically: pull the insert rod 35 out of the slot 12, loosen the locking cap 52, move the positioning plate 3 from the arc-shaped rail 41 to the transverse rail 42 to be measured, and then insert the insert rod 35 into the slot 12 to fix the position of the vernier 31; push the positioning plate 3 along the transverse rail 42 to be measured towards the grinding roller 7 until the front end of the positioning plate 3 abuts against the outer side of the grinding roller 7, and use the relative displacement of the moving grid and the fixed grid 33 to calculate the distance moved by the positioning plate 3 through the grating chip. This distance is the accurate wear amount. Then, calculate the actual wear amount L based on the zero point distance L0, and L will be directly displayed on the display screen 32.

[0057] It should be noted that grinding rollers 7 of different specifications need to be calibrated for zero distance L0. A new grinding roller 7 must be used during calibration to ensure the accuracy of data measurement.

[0058] Before use, adjust the position of the clamping part 2 and calibrate the zero distance L0 of the secondary rangefinder (for the same specifications); move the positioning plate 3 to the middle and both sides of the outer side of the grinding roller 7 respectively, and manually push the universal wheel 22 to make the measuring arc plate 1 rotate around the outer circumference of the grinding roller 7, so as to use the infrared rangefinder 6 to measure the predicted wear data of the outer side of the grinding roller 7 corresponding to the three transverse rails 42; after screening out the values ​​with larger predicted wear, determine the transverse rails 42 to be measured and the wear area to be measured, and finally use the secondary rangefinder to measure the actual wear L and display it on the display screen 32, so as to judge the wear degree of the grinding roller 7, so as to reuse, replace or weld the grinding roller 7.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the wear of a coal pulverizer roller, characterized by, include: A measuring arc plate is located on the outer side of the grinding roller. Both ends of the measuring arc plate extend to the two ends of the grinding roller, and a measuring area is provided in the middle of the measuring arc plate. The clamping components are installed at both ends of the measuring arc plate and clamp the sides of the grinding rollers that travel along them. A positioning plate, movably mounted on the measurement area, has a primary rangefinder mounted on its front end and a secondary rangefinder mounted on it; and The fixed rail is provided with an arc-shaped rail that matches the outer side of the grinding roller and multiple transverse rails that are connected to the arc-shaped rail and face the outer side of the grinding roller. The positioning plate is provided with a movable component that can restrict movement within the fixed rail.

2. A device for measuring the wear of a roller of a coal mill according to claim 1, characterized in that The clamping component includes a clamping frame and casters mounted on the bottom of the clamping frame. The top of the clamping frame is laterally movable and connected to the end of the measuring arc plate. The casters are pressed against the end side of the grinding roller.

3. A device for measuring the wear of a roller of a coal mill according to claim 2, characterized in that Both ends of the measuring arc plate are provided with inward moving grooves. Multiple sets of slots are arranged side by side in the moving grooves. The clamping frame is provided with an adjusting column that can move in the moving groove. Multiple pairs of elastic protrusions that can be inserted into the slots are symmetrically arranged on the adjusting column.

4. A device for measuring the wear of a roller of a coal mill according to claim 2, characterized in that, The clamping frame is equipped with a clamping spring that is connected to the top of the caster wheel.

5. A wear measuring device for a coal pulverizer roller as recited in claim 1, wherein, The movable component includes a movable plate, a movable bolt connected to the movable plate, and a locking cap. The movable plate is movably disposed within a fixed rail. The movable bolt extends through the top surface of the positioning plate and is threadedly connected to the locking cap.

6. A device for measuring the wear of a coal pulverizer roller according to claim 5, wherein The transverse rails are provided in three sections, which are respectively connected to the middle and both ends of the arc-shaped rail.

7. A device for measuring the wear of a coal pulverizer roller according to claim 1, wherein The rangefinder is an infrared rangefinder, which includes at least an infrared transmitting unit, a receiving unit, and a phase measuring unit.

8. A device for measuring the wear of a roller of a coal mill according to claim 7, characterized in that The secondary rangefinder is a capacitive digital display scale, which includes a vernier. The vernier is movably embedded in a positioning plate. The vernier contains a capacitive chip with a moving grating. The vernier has a display screen that is electrically connected to the capacitive chip. The positioning plate has a fixed grating that works in conjunction with the moving grating.

9. A device for measuring the wear of a coal pulverizer roller according to claim 8, wherein The phase measuring unit is electrically connected to the display screen.

10. A device for measuring the wear of a coal mill roller according to claim 7, characterized in that, The front end of the positioning plate is provided with a limiting block for restricting the movement of the vernier, and the rear end of the vernier is provided with a limiting component for restricting its movement.

Images