Motor slip ring of electromagnetic hanging beam bridge crane

Abstract

The utility model relates to the technical field of cranes, and particularly discloses a motor slip ring of an electromagnetic hanging beam bridge crane, which comprises a sliding travelling crane arranged on a travelling crane frame in a sliding manner, a driving motor is arranged above the sliding travelling crane, and the right end of an output shaft on the driving motor is connected with a winding roller arranged on the sliding travelling crane. A main hook and an auxiliary hook are arranged below the sliding travelling crane, a protective cover is installed at one end of the driving motor, a sliding ring is arranged in the protective cover, and two symmetrically-arranged contact units are arranged at one end of the driving motor; a polishing unit is arranged on the inner side of the protective cover and comprises a polishing block and a driving unit, an ejector rod is connected to the outer side of the polishing block, and the driving unit is used in cooperation with the ejector rod; according to the collector ring polishing device, the polishing block on the ejector rod is driven by the driving unit to be close to a collector ring to polish the collector ring, so that the surface of the collector ring is processed under the condition of no shutdown, and the operation steps of workers are reduced.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, specifically to a slip ring for an electromagnetic girder bridge crane motor. Background Technology

[0002] Slip ring motors, also known as three-phase wound-rotor AC asynchronous motors, require a resistor or reactor connected in series in the rotor circuit to reduce starting current, increase starting torque, improve power factor, and effectively enhance starting performance. Therefore, this type of motor is typically chosen for driving large-capacity machinery with high torque requirements.

[0003] A slip ring consists of a conductive ring, a tail brush, a brush holder, a conductive rod, a collector ring, and a slip ring cover. The windings of a wound-rotor are similar to those of the stator windings; the three-phase windings are connected in a star configuration, with the beginning of each phase winding connected to three copper slip rings, which are fixed to the shaft. The rings are insulated from each other and from the shaft, connected to the external circuit via a set of spring-loaded carbon brushes. After a period of operation, the slip rings and brushes experience prolonged sliding friction, resulting in pitting, cratering, and other surface wear on the slip ring and collector ring surfaces. This necessitates repair and finishing of the slip rings. Failure to repair them promptly will exacerbate brush wear due to the uneven wear, and point contact between the brush and slip ring can easily occur, leading to arcing and other abnormal discharge phenomena, ultimately damaging the entire motor.

[0004] A search revealed an online repair device for motor slip rings, authorized in CN108365499B. This device includes a fixed support with a vertical groove, a slider within the groove, and a slip ring processing tool at the lower end of the slider. The fixed support is fixed to the slip ring housing, and the slider extends into the housing. This device only requires disassembling the slip ring housing during repair, avoiding downtime caused by disassembling and installing the slip ring, and reducing the workload for motor troubleshooting. However, the repair process requires manual installation, where a crank handle is manually operated to bring the slip ring processing tool close to the slip ring for grinding. This manual method is cumbersome and labor-intensive. Therefore, this invention proposes a slip ring for electromagnetic girder bridge cranes to address these issues. Utility Model Content

[0005] This utility model provides a slip ring for an electromagnetic girder bridge crane motor, aiming to solve the technical problem that in related technologies, the motor slip ring repair device requires manual installation, manual operation of the crank handle to bring the slip ring processing tool close to the motor slip ring through the screw, and grinding the slip ring. This manual method is cumbersome, time-consuming and labor-intensive.

[0006] This utility model discloses a slip ring for an electromagnetic girder bridge crane motor, comprising a sliding trolley slidably mounted on a trolley frame, a drive motor mounted above the sliding trolley, a take-up roller mounted on the sliding trolley connected to the right end of the output shaft of the drive motor, a main hook and a secondary hook disposed below the sliding trolley, the main hook being connected to the take-up roller by a cable, a protective cover being mounted on one end of the drive motor, the other end of the output shaft of the drive motor extending into the protective cover, a slip ring sleeved on the output shaft being disposed inside the protective cover, and two symmetrically arranged contact units being disposed on one end of the drive motor;

[0007] The inner side of the protective cover is provided with a polishing unit for surface treatment of the slip ring. The polishing unit includes a polishing block and a driving unit for driving the polishing block to move. The polishing block is located on the side of the slip ring. A top rod is connected to the outer side of the polishing block. The driving unit is located on the outer side of the protective cover. The driving unit works in conjunction with the top rod.

[0008] Preferably, the drive unit includes a fixing frame fixed to the side of the cover. The fixing frame is U-shaped and the fixing frame and the cover are combined to form a receiving space. A first driver is installed on the outside of the fixing frame. The telescopic end of the first driver is connected to a transmission plate located in the receiving space. The top rod is connected to the transmission plate.

[0009] Preferably, the polishing unit is provided in two sets and arranged symmetrically.

[0010] Preferably, the drive unit includes a fixed frame fixed to the side of the cover and a transmission plate. A second driver is installed on the outer side of one end of the fixed frame. The rotating shaft of the second driver passes through the fixed frame and is rotatably connected to the inner wall of the fixed frame. A half gear is fixedly connected to the middle of the rotating shaft. A sliding block is fixedly connected to the outer side of the transmission plate. A tooth groove is opened in the middle of the sliding block. There are racks on the upper and lower sides of the tooth groove. The half gear meshes with the racks in the tooth groove.

[0011] Preferably, the contact unit includes a brush holder fixed on a support shaft, with guide sleeves connected to both ends of the brush holder. A carbon brush is installed inside the guide sleeve, with the inner end of the carbon brush being arc-shaped and in contact with a slip ring. An energizing post is fixedly connected to the middle of the outer side of the brush holder, and the energizing post is electrically connected to the carbon brush.

[0012] Preferably, the slip ring has multiple collector rings, the collector rings are metal rings, the collector rings are provided with terminals, and the slip rings are provided with two support shafts on both the upper and lower sides.

[0013] Preferably, the protective cover has two flat surfaces on both sides, and the drive unit is located in a flat position on the protective cover.

[0014] Preferably, the inner side of the grinding block is arc-shaped, and the top rod is detachably mounted on the transmission plate.

[0015] Preferably, the top rod is an elastic telescopic rod.

[0016] Beneficial effects:

[0017] 1. The grinding block on the push rod is driven by the drive unit to approach and contact the slip ring, and the slip ring is ground to remove the wear on the surface of the slip ring. This allows the slip ring surface to be treated without stopping the machine, while reducing the number of manual operation steps and realizing the automatic and timed grinding of the motor slip ring. In addition, automation can also improve the grinding accuracy of the motor slip ring.

[0018] 2. The push rod adopts an elastic telescopic rod to ensure that the grinding block is always in contact with the slip ring, and at the same time, it can avoid the grinding block and slip ring not making contact due to uneven wear of the slip ring. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the crane structure of this utility model;

[0020] Figure 2 This is a top view schematic diagram of the crane structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the drive motor structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of the protective cover of this utility model;

[0023] Figure 5 This is a schematic diagram of the drive unit structure of this utility model;

[0024] Figure 6 This is a schematic diagram of another embodiment of the drive unit structure of this utility model;

[0025] Figure 7 This is a utility model Figure 6 A magnified structural diagram of point A in the middle.

[0026] Figure label:

[0027] 1. Sliding trolley; 2. Drive motor; 3. Take-up roller; 4. Main hook; 5. Secondary hook; 21. Output shaft; 22. Protective cover; 23. Drive unit; 24. Support shaft; 25. Contact unit; 26. Grinding block; 27. Slip ring; 231. Fixing frame; 232. First driver; 233. Transmission plate; 234. Top rod; 235. Sliding block; 236. Rotating shaft; 237. Half gear; 238. Second driver; 2351. Gear groove; 251. Brush holder; 252. Guide sleeve; 253. Carbon brush; 271. Slip ring; 272. Terminal; 2511. Power supply post. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below, with examples of the embodiments shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0029] Example 1

[0030] like Figures 1 to 5 As shown, the present invention provides an electromagnetic girder bridge crane motor slip ring, including a sliding trolley 1 slidably mounted on the trolley frame, a drive motor 2 mounted above the sliding trolley 1, a take-up roller 3 mounted on the sliding trolley 1 connected to the right end of the output shaft 21 of the drive motor 2, and a main hook 4 and a secondary hook 5 arranged below the sliding trolley 1. The main hook 4 is connected to the take-up roller 3 by a cable, and the secondary hook 5 is connected to another take-up device on the sliding trolley 1 by a cable (details will not be elaborated here).

[0031] During the operation of the crane, the sliding trolley 1 moves on the trolley frame. When the main hook 4 on the sliding trolley 1 is above the material to be lifted, the main hook 4 hooks the material to be lifted and drives the winding roller 3 through the drive motor 2 to lift the material to be lifted on the main hook 4 and move it to the preset position through the sliding trolley 1.

[0032] A protective cover 22 is installed on the left end of the drive motor 2. The right end of the output shaft 21 of the drive motor 2 extends into the protective cover 22. Inside the protective cover 22, a slip ring 27 is sleeved on the output shaft 21. The slip ring 27 has multiple collector rings 271. The collector rings 271 are metal rings and have terminals 272. Two support shafts 24 are provided on the upper and lower sides of the slip ring 27. Contact units 25 are provided on the support shafts 24. The upper and lower contact units 25 are symmetrically arranged. The contact units 25 are used to realize the electrical connection between the electrical energy and the slip ring 27.

[0033] The contact unit 25 includes a brush holder 251 fixed on the support shaft 24. Guide sleeves 252 are fixedly connected to both ends of the brush holder 251. Carbon brushes 253 are installed inside the guide sleeves 252. The inner end of the carbon brushes 253 is arc-shaped and contacts the slip ring 27. A power supply post 2511 is fixedly connected to the middle of the outer side of the brush holder 251. The power supply post 2511 is electrically connected to the carbon brushes 253 so that electrical energy can be transferred to the carbon brushes 253 through the power supply post 2511. A pressure spring (not shown in the figure) is provided between the carbon brushes 253 and the guide sleeves 252 to ensure that the carbon brushes 253 are always in contact with the slip ring 271, so as to achieve the effect of automatically compensating for carbon brush wear and optimizing current transmission performance.

[0034] The inner side of the protective cover 22 is provided with a polishing unit for surface treatment of the slip ring 271. The polishing unit includes a polishing block 26 and a drive unit 23 for driving the polishing block 26 to move. The polishing block 26 is located on the side of the slip ring 271. The inner side of the polishing block 26 is arc-shaped, which allows the polishing block 26 to better contact the slip ring 271. The inner side of the polishing block 26 is arc-shaped and adapted to the circumference of the slip ring 271. A push rod 234 is fixedly connected to the outer side of the polishing block 26. The push rod 234 moves along the conveyor belt. The output shaft 21 is radially arranged, and the outer end of the push rod 234 passes through the protective cover 22. The drive unit 23 is located on the outside of the protective cover 22. The drive unit 23 works in conjunction with the push rod 234 to drive the grinding block 26 to move closer to or away from the grinding block 26. The push rod 234 is an elastic telescopic rod to ensure that the grinding block 26 is always in contact with the slip ring 271. The protective cover 22 has flat surfaces on both sides, and the drive unit 23 is located on the flat surface of the protective cover 22. The flat surface of the protective cover 22 is designed to facilitate the installation of the drive unit 23.

[0035] In the above solution, during long-term use, the sliding block 235 is in contact with the slip ring 271 for an extended period. Due to prolonged sliding friction between the slip ring 271 and the carbon brush 253, pits, dents, and other defects may develop on the surface of the slip ring 271, along with slight burrs or uneven surface wear. The drive unit 23 activates the grinding block 26 on the drive push rod 234 to approach and contact the slip ring 271. The output shaft 21 continues to rotate, thus grinding the surface of the slip ring 271 and removing the pits or dents. This automated grinding method improves the grinding accuracy of the slip ring 271 surface. Every 5000 hours of operation... Alternatively, replace the grease every 3-6 months. Use an grease gun to inject ZL-3 lithium-based grease into the bearing through the grease nozzle, filling the bearing cavity to 1 / 2 (2-pole motor) or 2 / 3 (4 / 6 / 8-pole motor). The maintenance cycle for slip ring 271 is the same as that for grease replacement. After replacing the grease, start the motor for a test run. Drive the drive unit 23 to activate the grinding block 26 on the drive rod 234 to approach and contact the slip ring 271, grinding the surface of the slip ring 271. After grinding, metal shavings will be generated on the slip ring 271, which will fall onto the inner bottom wall of the cover 22. Open the cover 22, clean the outer surface of the slip ring 271, and clean up the fallen copper shavings.

[0036] The drive unit 23 includes a fixing frame 231 fixed to the side of the protective cover 22. The fixing frame 231 is U-shaped and is combined with the protective cover 22 to form a receiving space. A first driver 232 is installed on the outside of the fixing frame 231. The first driver 232 is an electric telescopic rod. The telescopic end of the first driver 232 is fixedly connected to a transmission plate 233 located in the receiving space. The push rod 234 is detachably installed on the transmission plate 233. The detachable method can be bolt connection, snap-fit, etc., to facilitate the replacement of the grinding block 26. Two grinding units are provided and symmetrically arranged. The two grinding units can be used alternately to increase the service life of the grinding units. The two grinding units can work simultaneously to improve the processing efficiency of the grinding unit on the slip ring 271.

[0037] In the above scheme, when the slip ring 271 needs to be polished, the first driver 232 pushes the transmission plate 233 to move through the drive shaft. The transmission plate 233 drives the polishing blocks 26 on multiple push rods 234 to move towards the slip ring 271 on the slip ring 27 at the same time, so that the polishing blocks 26 polish the slip ring 271.

[0038] The first driver 232 is connected to the controller via a control line. The control unit is equipped with a time relay to enable the first driver 232 to intermittently drive the grinding block 26 to grind the slip ring 271 after the drive motor 2 has been running for a period of time, thereby reducing the need for manual operation.

[0039] Example 2

[0040] like Figure 6 and Figure 7 As shown, the difference between this and Embodiment 1 is that the drive unit 23 includes a fixed frame 231 fixed to the side of the cover 22 and a transmission plate 233. A second driver 238 is installed on the outer side of one end of the fixed frame 231. The second driver 238 adopts a self-locking motor to prevent the motor from rotating when it stops working. The rotating shaft 236 on the second driver 238 passes through the fixed frame 231 and is rotatably connected to the inner wall of the fixed frame 231. A half gear 237 is fixedly connected to the middle of the rotating shaft 236. A sliding block 235 is fixedly connected to the outer side of the transmission plate 233. A tooth groove 2351 is opened in the middle of the sliding block 235. There are racks on the upper and lower sides of the tooth groove 2351. The half gear 237 meshes with the rack in the tooth groove 2351.

[0041] In the above scheme, when the slip ring 271 needs to be polished, the second driver 238 drives the half gear 237 to rotate through the rotating shaft 236. The half gear 237 drives the sliding block 235 to move through the tooth groove 2351 on the sliding block 235. The sliding block 235 pushes the transmission plate 233 to move. The transmission plate 233 drives the polishing blocks 26 on multiple push rods 234 to move towards the slip ring 271 on the slip ring 27 at the same time. That is, after the half gear 237 rotates 180 degrees, the half gear 237 stops rotating, and the polishing blocks 26 contact the slip ring 271, so that the polishing blocks 26 polish the slip ring 271 to realize the reciprocating movement of the sliding block 235, which replaces the situation where the first driver needs to be flipped in Embodiment 1.

[0042] After the slip ring 271 is polished, the half gear 237 continues to rotate 180 degrees. The half gear 237 drives the sliding block 235 to move away from the slip ring 27, thus releasing the polishing block 26 from polishing the slip ring 271.

[0043] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0044] Furthermore, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A slip ring for an electromagnetic girder bridge crane motor, comprising a sliding trolley slidably mounted on a trolley frame, a drive motor mounted above the sliding trolley, a take-up roller mounted on the sliding trolley connected to the right end of the output shaft of the drive motor, and a main hook and a secondary hook disposed below the sliding trolley, the main hook being connected to the take-up roller by a cable, characterized in that, The drive motor is equipped with a protective cover at one end, and the output shaft of the drive motor extends into the protective cover at the other end. A slip ring is provided inside the protective cover and sleeved on the output shaft. Two symmetrically arranged contact units are provided on one end of the drive motor. The inner side of the protective cover is provided with a polishing unit for surface treatment of the slip ring. The polishing unit includes a polishing block and a driving unit for driving the polishing block to move. The polishing block is located on the side of the slip ring. A top rod is connected to the outer side of the polishing block. The driving unit is located on the outer side of the protective cover. The driving unit works in conjunction with the top rod.

2. The electromagnetic gantry crane motor slip ring of claim 1, wherein, The drive unit includes a U-shaped fixing frame fixed to the side of the cover. The fixing frame and the cover are combined to form a receiving space. A first driver is installed on the outside of the fixing frame. The telescopic end of the first driver is connected to a transmission plate located in the receiving space. The push rod is connected to the transmission plate.

3. The electromagnetic gantry crane motor slip ring of claim 1, wherein, The polishing unit is provided in two sets and is arranged symmetrically.

4. The electromagnetic gantry crane motor slip ring of claim 1, wherein, The drive unit includes a fixed frame and a transmission plate fixed to the side of the cover. A second driver is installed on the outer side of one end of the fixed frame. The rotating shaft of the second driver passes through the fixed frame and is rotatably connected to the inner wall of the fixed frame. A half gear is fixedly connected to the middle of the rotating shaft. A sliding block is fixedly connected to the outer side of the transmission plate. A tooth groove is opened in the middle of the sliding block. There are racks on the upper and lower sides of the tooth groove. The half gear meshes with the racks in the tooth groove.

5. The electromagnetic gantry crane motor slip ring of claim 1, wherein, The contact unit includes a brush holder fixed on a support shaft. Guide sleeves are connected to both ends of the brush holder. A carbon brush is installed inside the guide sleeve. The inner end of the carbon brush is arc-shaped and contacts a slip ring. An energizing post is fixedly connected to the middle of the outer side of the brush holder. The energizing post is electrically connected to the carbon brush.

6. The electromagnetic gantry crane motor slip ring of claim 1, wherein, The slip ring has multiple collector rings, each made of metal, and each collector ring has a terminal block. The slip ring also has two support shafts on its upper and lower sides.

7. The electromagnetic gantry crane motor slip ring of claim 1, wherein, The shield has two flat surfaces on both sides, and the drive unit is located on the flat surface of the shield.

8. The electromagnetic gantry crane motor slip ring of claim 1, wherein, The inner side of the grinding block is arc-shaped, and the push rod is detachably mounted on the transmission plate.

9. The electromagnetic gantry crane motor slip ring of claim 1, wherein, The top rod is an elastic telescopic rod.

Images