A method for eliminating cumulative assembly errors of slip rings in power transmission equipment

Abstract

This invention relates to a method for eliminating cumulative errors in slip ring assembly in power transmission equipment. The steps are as follows: 1. Before assembly, inspect the surface quality and fit quality between parts, and clean the parts and auxiliary equipment used; 2. Mark the ring deviations before assembly; 3. Calibrate the axial length of the slip ring assembly using a standard sleeve, and based on the calibrated axial length, perform trial assembly of the rings according to the positive and negative ring thickness deviations to achieve the designed axial dimensions; 4. Weld the slip rings and group and mark them according to the thickness deviations; 5. Clean the slip rings corresponding to multiple groups of slip ring assemblies in ultrasonic cleaning; 6. After cleaning, during assembly, each group of slip ring assemblies is grouped and assembled according to the ratio of positive and negative rings, eliminating the error caused by the thickness dimension by no more than 4 slip rings, and arranging the slip rings whose errors cannot be offset last in the assembly. This invention improves the overall assembly accuracy of the conductive ring.

Description

Technical Field

[0001] This invention belongs to the field of slip ring assembly technology in power transmission equipment, and particularly relates to a method for eliminating cumulative errors in slip ring assembly in power transmission equipment. Background Technology

[0002] This type of power transmission device is a precision electrical transmission device capable of transmitting electrical signals, graphics, power, and kinetic signals between two relatively 360° rotating mechanisms. Its main components include conductive rings, brushes, a bearing system, housing parts, and other components. The conductive rings are machined parts after the slip ring assembly is potted. The slip ring assembly consists of a molded sleeve, a left-end shaft, a right-end shaft, a mandrel, and the slip ring itself. Each brush bristle corresponds to a groove on a conductive ring, forming a friction pair to achieve current and signal transmission. Ideally, the slip ring and brush bristles form a friction pair with point contact, where both contact pressure and contact resistance are less than set values. However, a large misalignment angle not only increases the risk of ring jumps but also increases the contact area between the ring and brush bristles, resulting in a greater amount of wear debris generated per unit time than normal. As the conductive ring operates for longer periods, a large amount of wear debris adheres to the surface of the friction pair, acting as abrasive particles and accelerating the wear of the slip ring and brush bristles. This not only increases contact resistance but also severely affects the service life of the power transmission device. Ideally, the brush filaments in the brush and the grooves in the conductive ring should be perpendicularly aligned, with no axial misalignment of the filaments. However, both the conductive ring grooves and the brush filaments in the brush are pre-cured with epoxy resin, and their relative positions cannot be changed. During assembly, only certain areas can achieve perpendicular alignment between the filaments and the grooves; other areas will exhibit large misalignment between the groove positions and the filament alignment. Therefore, a method is urgently needed to ensure the assembly accuracy of each ring before the conductive ring is potted with epoxy resin. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for eliminating the cumulative error in slip ring assembly in power transmission equipment.

[0004] The above-mentioned objective of the present invention is achieved through the following technical solution:

[0005] A method for eliminating cumulative assembly errors of slip rings in power transmission equipment, characterized by comprising the following steps:

[0006] Step 1: Before assembly, inspect the surface quality of the parts and the fit quality between the parts, and clean the parts and all auxiliary equipment used.

[0007] Step 2: Mark the ring plate deviation before assembly;

[0008] Step 3: Use a standard sleeve to calibrate the axial length of the slip ring assembly. Based on the calibrated axial length, perform trial assembly of the slip rings according to the positive and negative deviations of the slip ring thickness, so as to achieve the designed axial dimensions.

[0009] Step 4: Perform slip ring welding and group and mark the slip rings according to their thickness deviation;

[0010] Step 5: Assemble multiple sets of slip rings and place them in an ultrasonic cleaner.

[0011] Step 6: After cleaning, during assembly, each group of slip rings is assembled in groups according to the ratio of positive to negative rings. For example, first take the first slip ring with a thickness tolerance of +0.001; then take the second slip ring with a thickness tolerance of -0.001, and so on. The cumulative error after combining the slip rings is eliminated by using a method of mutual cancellation of positive and negative tolerances. Errors caused by thickness are eliminated by using no more than four slip rings. Slip rings whose errors cannot be canceled out are arranged for final assembly.

[0012] Further: Step 1 includes:

[0013] 1.1 Clean and wipe down all tools, fixtures, instruments, and auxiliary materials required for the assembly process;

[0014] 1.2 Prepare sufficient parts according to the assembly list. The parts include mold sleeve, left end shaft, right end shaft, mandrel, conductive ring and wire. Use a microscope to check that the surface of the parts is smooth, sharp edges are blunted and there are no burrs.

[0015] 1.3. Perform trial assembly on parts with threaded connections, including the threaded connection between the left end shaft and the left end of the mold sleeve, the threaded connection between the right end shaft and the right end of the mold sleeve, and the threaded connection between the mandrel and the left end shaft. Repair any unqualified parts to ensure proper thread fit.

[0016] 1.4. Brush each part with alcohol and petroleum ether in sequence, and then clean it with Freon solution in an ultrasonic cleaner; after cleaning, dry it and put it in a sealed container for later use.

[0017] Further: In step 2, marking is done by using symbols instead of actual dimensions. The actual dimensions of the ring are recorded on the ring surface with a marker. One color represents positive deviation and another color represents negative deviation. 0 is not marked, 0.001 is marked with 1, 0.002 is marked with 11, 0.003 is marked with +, 0.004 is marked with +1, and 0.005 is marked with +11.

[0018] Furthermore, step 3 includes:

[0019] 3.1 First, connect the threaded end of the mandrel to the internal threaded hole of the left end shaft;

[0020] 3.2 Then insert the mandrel and the left end shaft from the left end of the mold sleeve, and connect the external thread on the left end shaft to the internal thread on the left end of the mold sleeve to realize the installation of the left end shaft and the mandrel;

[0021] 3.3 Insert a standard sleeve into the mold sleeve from the right end. The length of the standard sleeve is the design length of a set of slip ring assemblies.

[0022] 3.4. Fix the right end shaft to the right end of the mold sleeve through a threaded connection. At this time, the right end of the left end shaft and the left end of the right end shaft are pressed into contact with the two ends of the standard sleeve respectively.

[0023] 3.5 Draw an alignment line on the outer circle of the left end of the shaft and the mold sleeve, and on the outer circle of the right end of the shaft and the mold sleeve, respectively, as a mark to determine the axial dimension during subsequent assembly;

[0024] 3.6 After loosening and removing the right end shaft, remove the standard sleeve from the mold sleeve;

[0025] 3.7 Select a set of rings according to the actual measurement size of each ring. When selecting, match the rings according to the positive and negative tolerances of the ring thickness to avoid excessive cumulative error between the rings. Insert the rings into the mold sleeve from the left end in sequence, and tighten the right end shaft again at the right end of the mold sleeve.

[0026] 3.8. By checking the alignment line between the right end shaft and the right end of the mold sleeve, determine whether the axial dimension of the slip ring assembly meets the requirements of the drawing. If it is not aligned, replace the right end ring piece until the alignment line between the right end shaft and the right end of the mold sleeve is aligned in a straight line.

[0027] Furthermore, step 4 includes:

[0028] 4.1 Disassemble a set of ring plates and weld them according to the technical requirements of the slip ring drawings to complete the slip ring processing;

[0029] 4.2. After welding, the slip rings are grouped according to their actual thickness. After grouping, they are placed in different parts boxes. Each group of slip rings is tied with a label. The corresponding thickness deviation is etched on the label by laser.

[0030] 4.3. Place the grouped and tied slip rings into anhydrous ethanol and clean them with ultrasound.

[0031] 4.4 Without removing the label for each size, assemble a set of slip rings and tie all the corresponding slip rings together.

[0032] The advantages and positive effects of this invention are as follows:

[0033] 1. This invention improves the assembly accuracy of the conductive ring by ensuring that each slip ring is assembled according to its actual size before potting, thus controlling the size error of the parts within a very small range.

[0034] 2. The tools required for the process of this invention are simple and universal, the connection requirements between processes are low, and the overall production cost is low.

[0035] 3. The preparation process of this invention is simple and does not require high operating skills from workshop workers, making it suitable for a wide range of operators. Attached Figure Description

[0036] Figure 1 This is a structural diagram of the conductive ring assembly targeted by the present invention;

[0037] Figure 2 This is a structural diagram of the potting assembly for the conductive ring component targeted by the present invention;

[0038] Figure 3 This is a schematic diagram of the mold structure of the conductive ring assembly targeted by the present invention;

[0039] Figure 4 This is a diagram of the mandrel structure of the conductive ring assembly targeted by the present invention;

[0040] Figure 5 This is a structural diagram of shaft 1 of the conductive ring assembly targeted by the present invention;

[0041] Figure 6 This is a structural diagram of shaft 2 of the conductive ring assembly targeted by the present invention;

[0042] Figure 7 This is a diagram of the ring structure in the conductive ring assembly targeted by the present invention;

[0043] Figure 8 This is a diagram of the slip ring welding structure in the conductive ring assembly targeted by the present invention.

[0044] Specific implementation methods

[0045] The structure of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that these embodiments are descriptive and not limiting.

[0046] A method for eliminating cumulative assembly errors of slip rings in power transmission equipment; please refer to [link to relevant documentation]. Figures 1-8 Its inventive point is: including the following steps:

[0047] Step 1: Inspect the surface quality and fit quality of the parts before assembly, and clean the parts and auxiliary equipment used. This mainly includes...

[0048] 1.1 Clean and wipe all tools, fixtures, instruments and auxiliary materials required for the assembly process, and prepare them.

[0049] 1.2 Prepare sufficient parts according to the assembly list. The parts include mold sleeve, left end shaft, right end shaft, mandrel, conductive ring and wire. Use a microscope to check that the surface of the parts is smooth, sharp edges are blunted and there are no burrs.

[0050] 1.3. Perform trial assembly on parts with threaded connections, including the threaded connection between the left end shaft and the left end of the mold sleeve, the threaded connection between the right end shaft and the right end of the mold sleeve, and the threaded connection between the mandrel and the left end shaft. Repair any unqualified parts to ensure proper thread fit.

[0051] 1.4. Clean each part in sequence with alcohol and petroleum ether, including mold sleeve 2, left end shaft 1, right end shaft 5, mandrel 3, and ring plate 4; then, clean with Freon solution in an ultrasonic cleaner; after cleaning, dry and put into a sealed container for later use.

[0052] Step 2: Mark the ring plate deviation before assembly:

[0053] Considering the very small surface area of ​​the ring plate, a method of using markings to represent actual dimensions is adopted. The actual dimensions of the ring plate are recorded on the ring surface with a marker, using one color to represent positive deviation and another color to represent negative deviation; for example, red is used to represent positive deviation and blue to represent negative deviation. Specifically, this is recorded in the following way:

[0054] 0 is not marked, 0.001 is marked with 1, 0.002 is marked with 11, 0.003 is marked with +, 0.004 is marked with +1, and 0.005 is marked with +11.

[0055] Step 3: Perform trial assembly of the ring plate, specifically as follows:

[0056] 3.1 First, connect the threaded end of the mandrel to the internal threaded hole of the left end shaft;

[0057] 3.2 Then insert the mandrel and the left end shaft from the left end of the mold sleeve, and connect the external thread on the left end shaft to the internal thread on the left end of the mold sleeve to realize the installation of the left end shaft and the mandrel;

[0058] 3.3 Insert a standard sleeve into the mold sleeve from the right end. The length of the standard sleeve is the design length of a set of slip ring assemblies.

[0059] 3.4. Fix the right end shaft to the right end of the mold sleeve through a threaded connection. At this time, the right end of the left end shaft and the left end of the right end shaft are pressed into contact with the two ends of the standard sleeve respectively.

[0060] 3.5 Draw an alignment line on the outer circle of the left end of the shaft and the mold sleeve, and on the outer circle of the right end of the shaft and the mold sleeve, respectively, as a mark to determine the axial dimension during subsequent assembly;

[0061] 3.6 After loosening and removing the right end shaft, remove the standard sleeve from the mold sleeve;

[0062] 3.7 Select a set of rings according to the actual measurement size of each ring. When selecting, match the rings according to the positive and negative tolerances of the ring thickness to avoid excessive cumulative error between the rings. Insert the rings into the mold sleeve from the left end in sequence, and tighten the right end shaft again at the right end of the mold sleeve.

[0063] 3.8. By checking the alignment line between the right end shaft and the right end of the mold sleeve, determine whether the axial dimension of the slip ring assembly meets the requirements of the drawing. If it is not aligned, replace the right end ring piece until the alignment line between the right end shaft and the right end of the mold sleeve is aligned in a straight line.

[0064] Step 4: Perform slip ring welding

[0065] 4.1 Disassemble a set of ring pieces and weld them according to the technical requirements of the slip ring drawing to complete the processing of the slip ring (including two parts: ring piece 4 and wire 6);

[0066] 4.2. After welding, the slip rings are grouped according to their actual thickness. After grouping, they are placed in different parts boxes. Each group of slip rings is tied with a label. The corresponding thickness deviation is etched on the label by laser.

[0067] 4.3. Place the grouped and tied slip rings into anhydrous ethanol and clean them with ultrasound. The purpose of this cleaning step is to use the cavitation effect of ultrasound to remove excess material hidden in the narrow space of the part structure.

[0068] 4.4 Without disassembling the label for each size, assemble a set of slip rings and tie all the corresponding slip rings together;

[0069] Step 5: Place the corresponding slip rings of the multiple slip ring assembly into an ultrasonic cleaner, using Freon as the cleaning medium to fully utilize Freon's excellent degreasing and cleaning capabilities, ensuring that the cleanliness of the parts surface meets the assembly requirements.

[0070] Make sure that the labels of each size do not fall off;

[0071] Step 6: After cleaning, during assembly, each group of slip rings is assembled in proportion to the positive and negative rings. Errors caused by thickness are eliminated by using no more than four slip rings. Slip rings whose errors cannot be eliminated are assembled last.

[0072] This invention can be used for the assembly and production of high-precision parts in industries such as aerospace, aviation, shipbuilding, and precision instruments, and has a very broad prospect for promotion and application.

[0073] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A method for eliminating cumulative errors in the assembly of slip rings in a power transmission device, characterized by, Includes the following steps: Step 1: Before assembly, inspect the surface quality of the parts and the fit quality between the parts, and clean the parts and all auxiliary equipment used. Step 2: Mark the ring plate deviation before assembly; Step 3: Use a standard sleeve to calibrate the axial length of the slip ring assembly. Based on the calibrated axial length, perform trial assembly of the slip rings according to the positive and negative deviations of the slip ring thickness, so as to achieve the designed axial dimensions. Step 4: Perform slip ring welding and group and mark the slip rings according to their thickness deviation; Step 5: Assemble multiple sets of slip rings and place them in an ultrasonic cleaner. Step 6: After cleaning, during assembly, each group of slip rings is assembled in groups according to the ratio of positive and negative rings. Errors caused by thickness dimensions are eliminated by no more than 4 slip rings. Slip rings whose errors cannot be eliminated are arranged for final assembly. Step 3 includes: 3.1 First, connect the threaded end of the mandrel to the internal threaded hole of the left end shaft; 3.2 Then insert the mandrel and the left end shaft from the left end of the mold sleeve, and connect the external thread on the left end shaft to the internal thread on the left end of the mold sleeve to realize the installation of the left end shaft and the mandrel; 3.3 Insert a standard sleeve into the mold sleeve from the right end. The length of the standard sleeve is the design length of a set of slip ring assemblies. 3.

4. Fix the right end shaft to the right end of the mold sleeve through a threaded connection. At this time, the right end of the left end shaft and the left end of the right end shaft are pressed into contact with the two ends of the standard sleeve respectively. 3.5 Draw an alignment line on the outer left end of the shaft and the mold sleeve, and on the outer right end of the shaft and the mold sleeve, respectively. As a marker to determine the axial dimension during subsequent assembly; 3.6 After loosening and removing the right end shaft, remove the standard sleeve from the mold sleeve; 3.7 Select a set of rings according to the actual measurement size of each ring. When selecting, match the rings according to the positive and negative tolerances of the ring thickness to avoid excessive cumulative error between the rings. Insert the rings into the mold sleeve from the left end in sequence, and tighten the right end shaft again at the right end of the mold sleeve. 3.

8. By checking the alignment line between the right end shaft and the right end of the mold sleeve, determine whether the axial dimension of the slip ring assembly meets the requirements of the drawing. If it is not aligned, replace the right end ring piece until the alignment line between the right end shaft and the right end of the mold sleeve is aligned in a straight line.

2. The method for eliminating cumulative assembly error of slip rings in power transmission equipment according to claim 1, characterized in that: Step 1 includes: 1.1 Clean and wipe down all tools, fixtures, instruments, and auxiliary materials required for the assembly process; 1.2 Prepare sufficient parts according to the assembly list. The parts include mold sleeve, left end shaft, right end shaft, mandrel, conductive ring and wire. Use a microscope to check that the surface of the parts is smooth, sharp edges are blunted and there are no burrs. 1.

3. Perform trial assembly on parts with threaded connections, including the threaded connection between the left end shaft and the left end of the mold sleeve, the threaded connection between the right end shaft and the right end of the mold sleeve, and the threaded connection between the mandrel and the left end shaft. Repair any unqualified parts to ensure proper thread fit. 1.

4. Brush each part with alcohol and petroleum ether in sequence, and then clean it with Freon solution in an ultrasonic cleaner; after cleaning, dry it and put it in a sealed container for later use.

3. The method for eliminating cumulative assembly errors of slip rings in power transmission equipment according to claim 1, characterized in that: In step 2, marking is done using symbols instead of actual dimensions. The actual dimensions of the ring are recorded on the ring surface with a marker. One color represents positive deviation, and another color represents negative deviation. 0 is not marked, 0.001 is marked with 1, 0.002 is marked with 11, 0.003 is marked with +, 0.004 is marked with +1, and 0.005 is marked with +11.

4. The method for eliminating cumulative assembly error of slip rings in power transmission equipment according to claim 1, characterized in that: Step 4 includes: 4.1 Disassemble a set of ring plates and weld them according to the technical requirements of the slip ring drawings to complete the slip ring processing; 4.

2. After welding, the slip rings are grouped according to their actual thickness. After grouping, they are placed in different parts boxes. Each group of slip rings is tied with a label. The corresponding thickness deviation is etched on the label by laser. 4.

3. Place the grouped and tied slip rings into anhydrous ethanol and clean them with ultrasound. 4.4 Without removing the label for each size, assemble a set of slip rings and tie all the corresponding slip rings together.

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