A slip ring on-line grinding device and method of use

Abstract

An online slip ring grinding device and its method of use include a brush holder with a detachable grinding body adjustment device. The grinding body adjustment device includes a sliding sleeve insert connected to a support tube arm, which in turn connects to a brush box. The brush box contains a grinding body and a first spring, with the grinding body cooperating with the first spring. A brake rod is located within the support tube arm, its middle section connected to the support tube arm via a second fixing pin. One end of the brake rod has a grinding body braking protrusion for braking the grinding body, and the other end has a trigger protrusion that cooperates with a cam. The cam is mounted on an operating rod, with a handle at the end of the operating rod. A second spring is located on the brake rod for resetting the brake rod. This invention enables grinding of slip rings without shutting down the equipment, ensuring a sufficient safe distance between the operator and the slip ring device, thus enhancing operator safety.

Description

Technical Field

[0001] This invention belongs to the field of slip ring grinding technology, and specifically relates to an online slip ring grinding device and its usage method. Background Technology

[0002] During use, generator slip rings are susceptible to damage from impacts, arc burns, and corrosion from moisture during shutdowns. This can lead to abnormalities such as burrs, sharp corners, flash, pitting, and rust on the slip ring surface, making the surface finish unsuitable for operation. Therefore, grinding is necessary before use. There are three existing methods for grinding slip rings: ① Remove the slip ring from the equipment and transport it to a professional machining plant for turning and polishing; ② Remove the slip ring from the equipment, hoist it to the maintenance station, and grind it manually using sandpaper, an oilstone, or an angle grinder; ③ While the generator is running, gently wipe the slip ring with a cotton cloth while it is rotating.

[0003] The existing technology has the following shortcomings:

[0004] Option ① requires the removal of a large number of adjacent components before the slip ring can be removed and transported to the machine shop for processing. This involves a large workload and a long construction period. The slip ring surface is easily damaged during the disassembly, assembly and hoisting process, which affects the availability of the generator.

[0005] Option ② involves time-consuming and labor-intensive disassembly and assembly of slip rings. Manual grinding results in low surface finish and low efficiency. The risk of accidentally damaging the ring surface when using power tools during the grinding process is high. The ring surface is also easily damaged during disassembly, assembly, and hoisting of slip rings, affecting the availability of the generator.

[0006] Option ③ is limited by the working space and can only clean localized annular contamination and surface corrosion, resulting in unsatisfactory treatment. At the same time, maintenance personnel working close to rotating live equipment may suffer mechanical injuries and electric shocks, posing an extremely high risk of personal injury. Summary of the Invention

[0007] In view of the technical problems existing in the background art, the slip ring online grinding device and method provided by the present invention can grind the slip ring without stopping the equipment, and the operator can maintain a sufficient safe distance from the slip ring device, thus ensuring high safety of personnel operation.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] An online grinding device for slip rings includes a brush holder with a detachable grinding body adjustment device. The grinding body adjustment device includes a sliding sleeve insert connected to a support tube arm, which is connected to a brush box. The brush box contains a grinding body and a first spring, which cooperates with the first spring. A brake rod is located inside the support tube arm, with its middle section connected to the support tube arm via a second fixing pin. One end of the brake rod has a grinding body braking protrusion for braking the grinding body, and the other end has a trigger protrusion that cooperates with a cam. The cam is mounted on an operating lever, and the end of the operating lever has a handle. A second spring is located on the brake rod for resetting the brake rod.

[0010] Preferably, the bottom of the brush holder is provided with a screw hole for connecting to the conductive ring. The screw hole is a waist-shaped hole. The side of the brush holder is provided with a brush holder facade. The brush holder facade has a slot, and the slot is provided with multiple first slots arranged linearly.

[0011] Preferably, the operating lever and handle have an insulating layer on their surfaces, and the insulation level is ≥1kV.

[0012] Preferably, the grinding media should be adapted to the linear velocity of the slip ring; for coarse grinding, grinding media with a mesh size of ≥600 should be used, and for fine grinding, grinding media with a mesh size of ≥2000 should be used.

[0013] Preferably, the diameter of the operating lever is smaller than the width of the slot, and the other end of the operating lever is provided with a first fixing pin, which is adapted to the first slot.

[0014] Preferably, the brush holder is provided with a wedge-shaped groove, and the sliding sleeve is used to be inserted into the wedge-shaped groove, with the outer wall of the sliding sleeve fitting against the wedge-shaped groove.

[0015] Preferably, the sliding sleeve insert is provided with a cam rotation groove for cam movement, the width of the cam rotation groove is greater than the thickness of the cam, and the cam rotation groove is connected to the support tube arm.

[0016] Preferably, the inner wall of the cam rotation groove is provided with a spring piece, which contacts the side wall of the cam. Preferably, the first spring is a constant pressure coil spring, which is installed on the top surface of the brush box. The first spring is used to push the grinding body forward and provide preload. The side wall of the grinding body is provided with a second slot, which is used to limit the first spring and ensure that the elastic force applied by the first spring to the grinding body is coaxial with the central axis of the grinding body.

[0017] Preferably, the method of using the online polishing device for slip rings is characterized by comprising the following steps:

[0018] Step 1, Brush holder installation: Fix the brush holder to the conductive ring of the slip ring device through screw holes and bolts; when installing the brush holder, adjust the installation position to ensure that the axis of the brush holder is perpendicular to the tangent of the outer ring surface of the slip ring, and the minimum distance between the brush box and the slip ring is ≥5mm;

[0019] Step 2, Adjusting the grinding body adjustment device: Rotate the operating lever to allow the grinding body to move freely, press the grinding body with your hand so that its end face is flush with the end face of the brush box, and rotate the operating lever to lock the grinding body;

[0020] Step 3, installation of grinding media adjustment device: Slowly insert the sliding sleeve of the grinding media adjustment device from the top of the wedge-shaped slot to the predetermined position in the wedge-shaped slot. At this time, the first fixing pin is set vertically. Push the operating rod forward and rotate the operating rod to align the first fixing pin with the first slot. Then release the operating rod to allow the first fixing pin to slide into the first slot.

[0021] While rotating the operating lever, the operating lever drives the cam to rotate. The cam lifts the trigger protrusion of the brake lever, the second spring is compressed, the grinding body braking protrusion of the brake lever separates from the grinding body, and the grinding body is pushed forward by the first spring until it contacts the slip ring. At this time, the first spring provides a pressure of 15N-25N, and the grinding body and the slip ring make contact under pressure.

[0022] Step 4, perform online grinding: During the rotation of the slip ring, sliding friction will occur between it and the grinding media, thereby achieving the purpose of grinding the slip ring; select grinding media of different mesh sizes according to the surface finish of the slip ring;

[0023] Step 5: After local grinding is completed, push the operating lever forward and rotate the operating lever. The second spring returns to its original position, and the grinding body braking protrusion contacts the grinding body and presses the grinding body tightly.

[0024] Then move the sliding sleeve plug up or down to move the grinding body to another position, and then repeat step 3.

[0025] Step 6: After the online grinding process is completed, rotate the operating lever again. After the first fixing pin disengages from the first slot, remove the grinding body adjustment device.

[0026] The present invention can achieve the following beneficial effects:

[0027] 1) It can grind the slip ring without stopping the equipment, and the operator can maintain a sufficient safe distance from the slip ring device, ensuring high safety for personnel.

[0028] 2) The linear speed of the collector ring during operation is very high, resulting in fast polishing and grinding speed and high efficiency of the present invention.

[0029] 3) By adjusting the installation height of the operating lever, the entire surface of the collector ring can be ground without any dead angles.

[0030] 4) Depending on the degree of damage to the collector ring surface, a grinding media of appropriate mesh size can be selected for grinding, or multiple grinding media can be combined for grinding, resulting in good grinding quality. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0032] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0033] Figure 2 This is a cross-sectional view of the present invention;

[0034] Figure 3 This is a structural diagram of the grinding media adjustment device of the present invention.

[0035] In the diagram: 1-Brush holder, 2-Operating lever, 3-Cam, 4-First slot, 5-First fixing pin, 6-Brake lever, 7-Second fixing pin, 8-Grinding body, 9-Brush box, 10-First spring, 11-Second spring, 12-Second slot, 13-Sliding sleeve insert, 14-Wedge-shaped slot, 15-Brush holder facade, 16-Screw hole, 17-Support tube arm, 18-Handle, 19-Collector ring, 20-Conductive ring, 21-Spring. Detailed Implementation

[0036] Example 1:

[0037] Preferred solutions include Figures 1 to 3 As shown, an online grinding device for slip rings includes a brush holder 1, on which a grinding body adjustment device is detachably provided. The grinding body adjustment device includes a sliding sleeve insert 13, which is connected to a support tube arm 17. The support tube arm 17 is connected to a brush box 9. The brush box 9 contains a grinding body 8 and a first spring 10, which cooperate with the first spring 10. The support tube arm 17 contains a brake rod 6, which is connected to the support tube arm 17 in the middle by a second fixing pin 7. One end of the brake rod 6 has a grinding body braking protrusion for braking the grinding body 8. The other end of the brake rod 6 has a trigger protrusion that cooperates with a cam 3. The cam 3 is mounted on an operating rod 2. The end of the operating rod 2 has a handle 18. The brake rod 6 has a second spring 11 for resetting the brake rod 6.

[0038] The brush holder 1 has a "T"-shaped structure with four through-holes 16 at the bottom for fixing to the conductive ring 20. The sliding sleeve insert 13 is connected to the support tube arm 17 and the brush box 9 as a whole. A brake rod 6 is rotatably mounted inside the support tube arm 17, with its two ends contacting the cam 3 and the grinding body 8, respectively. An operating lever 2 is rotatably mounted inside the sliding sleeve insert 13. Rotating the operating lever 2 drives the cam 3 to rotate, which in turn drives the brake rod 6 to rotate. This allows for pressing or releasing the grinding body 8.

[0039] Specifically, the bottom of the brush holder 1 is provided with a screw hole 16 for connection with the conductive ring 20, and the side of the brush holder 1 is provided with a brush holder surface 15. The brush holder surface 15 has a slot, and the slot is provided with multiple first slots 4, which are arranged linearly. The first fixing pin 5 is adapted to the first slot 4. Specifically, the first fixing pin 5 is used to slide into the first slot 4 to prevent the grinding body adjustment device from slipping off. The diameter of the operating rod 2 is smaller than the width of the slot, and the other end of the operating rod 2 is provided with a first fixing pin 5, which is adapted to the first slot 4.

[0040] Furthermore, the brush holder 1 is provided with a wedge-shaped groove 14, and a sliding sleeve insert 13 is used to insert into the wedge-shaped groove 14, with the outer wall of the sliding sleeve insert 13 fitting against the wedge-shaped groove 14. The wedge-shaped groove 14 contacts the wedge-shaped sliding sleeve insert 13, and its stability is stronger than that of a square block.

[0041] Furthermore, the sliding sleeve insert 13 is provided with a cam rotation groove for the movement of the cam 3. The width of the cam rotation groove is greater than the thickness of the cam 3, and the cam rotation groove is connected to the support tube arm 17. The operating lever 2 can move axially a small distance, and the amount of displacement is determined according to the depth of the first slot 4.

[0042] Furthermore, the inner wall of the cam rotation groove is provided with a spring piece 21, which contacts the side wall of the cam 3. This prevents the operating lever 2 from loosening, and ensures that the first fixing pin 5 will not disengage from the first slot 4 after it enters the first slot 4.

[0043] The first spring 10 is a coiled constant pressure spring with a pressure range of 15N-25N, and its center is located on the axis of the grinding body 8. The first spring 10 and the second slot 12 are fitted with a clearance, and after being pressed, their surfaces are in contact. The first spring 10 is installed on the top surface of the brush box 9 and is used to push the grinding body 8 forward. The side wall of the grinding body 8 is provided with the second slot 12, which is used to limit the coiled spring.

[0044] The handle 18 of the operating lever 2 is covered with insulating material, and its electrical strength is not less than 1kV. The minimum distance between the handle 18 and the brush holder 1 is not less than 10cm, which meets the electrical safety distance requirement. The first slot 4 is an arc-shaped slot, and the first fixing pin 5 is clearance-fitted with the first slot 4. The diameter of the first fixing pin 5 and the first slot 4 should preferably be 2mm to 3mm. The spacing between the first slots 4 should not be too large to ensure that the operating lever 2 can be continuously adjusted in height. The single-sided gap between the brush box 2 and the grinding body 8 is 0.5mm to 2mm.

[0045] The method of using the aforementioned online polishing device for slip rings includes the following steps:

[0046] Step 1, Brush holder installation: Fix the brush holder 1 to the conductive ring 20 of the slip ring device through the screw hole 16 and bolts; when installing the brush holder 1, adjust the installation position to ensure that the axis of the brush holder 1 is perpendicular to the tangent of the outer ring surface of the collector ring 19, and the minimum distance between the brush box 9 and the collector ring 19 is ≥5mm.

[0047] Step 2, Adjusting the grinding body adjustment device: Rotate the operating lever 2 to allow the grinding body 8 to move freely, press the grinding body 8 with your hand so that its end face is flush with the end face of the brush box 9, and rotate the operating lever 2 to lock the grinding body 8;

[0048] Step 3, installation of grinding media adjustment device: Slowly insert the sliding sleeve plug 13 of the grinding media adjustment device from the top of the wedge-shaped slot 14 to the predetermined position in the wedge-shaped slot 14. At this time, the first fixing pin 5 is set vertically. Push the operating rod 2 forward and rotate the operating rod 2 so that the first fixing pin 5 is aligned with the first slot 4. Then release the operating rod 2 so that the first fixing pin 5 slides into the first slot 4.

[0049] While rotating the operating lever 2, the operating lever 2 drives the cam 3 to rotate. The cam 3 lifts the trigger protrusion of the brake lever 6, and the second spring 11 is compressed. The grinding body braking protrusion of the brake lever 6 separates from the grinding body 8. The grinding body 8 is pushed forward by the first spring 10 until it contacts the slip ring 19. At this time, the first spring 10 provides a pressure of 15N-25N, and the grinding body 8 and the slip ring 19 are in contact under pressure.

[0050] Step 4, perform online grinding: During the rotation of the slip ring 19, it will slide and rub against the grinding body 8, thereby achieving the purpose of grinding the slip ring 19; depending on the surface finish of the slip ring, select grinding bodies 8 with different mesh sizes;

[0051] Step 5: After local grinding is completed, push the operating lever 2 forward and rotate the operating lever 2. The second spring 11 returns to its original position, and the grinding body braking protrusion contacts the grinding body 8 and presses the grinding body 8 tightly.

[0052] Then move the sliding sleeve plug 13 up or down to move the grinding body 8 to other positions, and then repeat step 3.

[0053] Step 6: After the online grinding process is completed, rotate the operating lever 2 again. After the first fixing pin 5 disengages from the first slot 4, remove the grinding body adjustment device.

[0054] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An online grinding device for slip rings, characterized in that: The brush holder (1) is detachably provided with a grinding body adjustment device. The grinding body adjustment device includes a sliding sleeve insert (13), which is connected to a support tube arm (17). The support tube arm (17) is connected to a brush box (9). The brush box (9) contains a grinding body (8) and a first spring (10). The grinding body (8) cooperates with the first spring (10). The support tube arm (17) contains a brake rod (6). The middle part of the brake rod (6) is connected to the support tube arm (17) through a second fixing pin (7). One end of the brake rod (6) is provided with a grinding body braking protrusion, which is used to brake the grinding body (8). The other end of the brake rod (6) is provided with a trigger protrusion, which cooperates with a cam (3). The cam (3) is set on an operating rod (2). The end of the operating rod (2) is provided with a handle (18). The brake rod (6) is provided with a second spring (11), which is used to reset the brake rod (6). The bottom of the brush holder (1) is provided with a screw hole (16) for connecting to the conductive ring (20). The screw hole (16) is a waist-shaped hole. The side of the brush holder (1) is provided with a brush holder facade (15). The brush holder facade (15) has a slot. The slot is provided with multiple first slots (4). The multiple first slots (4) are arranged in a linear manner. The diameter of the operating lever (2) is smaller than the width of the slot, and the other end of the operating lever (2) is provided with a first fixing pin (5), which is adapted to the first slot (4); The brush holder (1) is provided with a wedge-shaped slot (14), and a sliding sleeve insert (13) is used to be inserted into the wedge-shaped slot (14). The outer wall of the sliding sleeve insert (13) is in contact with the wedge-shaped slot (14). The sliding sleeve insert (13) is provided with a cam rotation groove for the movement of the cam (3). The width of the cam rotation groove is greater than the thickness of the cam (3). The cam rotation groove is connected to the support tube arm (17). The method of using the aforementioned online grinding device for slip rings is characterized by comprising the following steps: Step 1, Brush holder installation: Fix the brush holder (1) to the conductive ring (20) of the slip ring device through the screw hole (16) and bolt; When installing the brush holder (1), adjust the installation position to ensure that the axis of the brush holder (1) is perpendicular to the tangent of the outer ring surface of the collector ring (19), and the minimum distance between the brush box (9) and the collector ring (19) is ≥5mm; Step 2, Adjusting the grinding body adjustment device: Rotate the operating lever (2) to make the grinding body (8) move freely, press the grinding body (8) with your hand to make its end face flush with the end face of the brush box (9), and rotate the operating lever (2) to lock the grinding body (8). Step 3, installation of grinding media adjustment device: Slowly insert the sliding sleeve plug (13) of the grinding media adjustment device from the top of the wedge-shaped slot (14) to the predetermined position in the wedge-shaped slot (14). At this time, the first fixing pin (5) is set vertically. Push the operating rod (2) forward and rotate the operating rod (2) to align the first fixing pin (5) with the first slot (4). Then release the operating rod (2) to let the first fixing pin (5) slide into the first slot (4). While rotating the operating lever (2), the operating lever (2) drives the cam (3) to rotate. The cam (3) lifts the trigger protrusion of the brake lever (6), the second spring (11) is compressed, the grinding body braking protrusion of the brake lever (6) separates from the grinding body (8), and the grinding body (8) is pushed forward by the first spring (10) until it contacts the slip ring (19). At this time, the first spring (10) provides a pressure of 15N-25N, and the grinding body (8) and the slip ring (19) are in contact under pressure. Step 4, online grinding: During the rotation of the collector ring (19), sliding friction will occur between it and the grinding body (8), thereby achieving the purpose of grinding the collector ring (19); according to the surface finish of the collector ring, different mesh sizes of grinding bodies (8) are selected. Step 5: After the local grinding is completed, push the operating lever (2) forward and rotate the operating lever (2). The second spring (11) will return to its original position, and the grinding body braking protrusion will contact the grinding body (8) and press the grinding body (8) tightly. Then move the sliding sleeve plug (13) up or down to move the grinding body (8) to other positions, and then repeat step 3. Step 6: After the online grinding process is completed, rotate the operating lever (2) again. After the first fixing pin (5) disengages from the first slot (4), remove the grinding body adjustment device.

2. The online grinding device for slip rings according to claim 1, characterized in that: The operating lever (2) and handle (18) are provided with an insulating layer, and the insulation level is ≥1kV.

3. The online grinding device for slip rings according to claim 1, characterized in that: The linear velocity of the grinding media (8) and the slip ring (19) should be matched. For rough grinding, a grinding media (8) with a mesh size of ≥600 should be selected, and for fine grinding, a grinding media (8) with a mesh size of ≥2000 should be selected.

4. The online grinding device for slip rings according to claim 1, characterized in that: The inner wall of the cam rotation groove is provided with a spring piece (21), which contacts the side wall of the cam (3).

5. The online grinding device for slip rings according to claim 1, characterized in that: The first spring (10) is a constant pressure coil spring. The first spring (10) is installed on the top surface of the brush box (9). The first spring (10) is used to push the grinding body (8) forward and provide pre-tightening force. The side wall of the grinding body (8) is provided with a second slot (12). The second slot (12) is used to limit the first spring (10) to ensure that the elastic force applied by the first spring (10) to the grinding body (8) is coaxial with the central axis of the grinding body (8).

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