Platform ladder for internal maintenance of transformer

Abstract

A platform ladder for internal maintenance of a transformer comprises a plurality of crawling ladder units and a top platform, the upper and lower adjacent crawling ladder units can be in butt joint, and the top platform is installed at the top of the crawling ladder unit at the uppermost end; each crawling ladder unit comprises two longitudinal rods and a plurality of transverse rods mounted on the two longitudinal rods, and extension rods extending oppositely are arranged on the two longitudinal rods; and an auxiliary device is mounted at the end part of the extension rod, or the auxiliary device is mounted at the end part of the extension rod, and the auxiliary device is also mounted at the bottom of the longitudinal rod of the ladder stand unit at the lowest end. The platform ladder can be butted and extended according to a maintenance part, an auxiliary device is mounted at the end part of the extension rod, and the extension rod can be connected with the inner wall of a transformer shell through the auxiliary device, so that the platform ladder can be conveniently erected at the maintenance position, and a top platform is mounted at the top of the uppermost crawling ladder unit. The transformer coil assembly pressing plate and other parts can be conveniently overhauled, or operators can stand or sit down during long-time overhauls.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer maintenance tools for hydropower stations, in particular to a platform ladder used for internal maintenance of transformers. Background Art

[0002] The internal space of the transformer is small. In the past, ordinary sectional telescopic ladders were generally used to go up and down the transformer body to check the low-voltage side leads inside the transformer. Due to the large size of the ladder, it is not easy to enter and exit the oil tank, and it is not convenient for operators to climb the transformer body. There is also a problem that the placement of the ladder is limited and the ladder cannot be set up at any position inside the transformer. In addition, the telescopic ladder also has problems such as loose fixation and loose fixation to the ground. When climbing, there are problems such as the bottom of the ladder sliding and the ladder shortening out of control after being stressed. Therefore, using the existing telescopic ladder to inspect the inside of the transformer is likely to cause damage to the internal electrical components of the transformer and the operators, and there are safety risks and hidden dangers. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to solve the problems existing in the above-mentioned background technology, and to provide a platform ladder for internal maintenance of a transformer, wherein the platform ladder has a plurality of ladder units, which can be connected and extended according to the maintenance position, and the two longitudinal rods of the ladder unit are provided with extension rods, and the ends of the extension rods are installed with auxiliary devices, which can be connected with the inner wall of the transformer shell through the auxiliary device, so that the platform ladder can be conveniently set up to the maintenance position, and a top platform is installed on the top of the uppermost ladder unit, which is convenient for maintenance of the transformer coil group pressure plate and other parts.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a platform ladder for internal maintenance of a transformer, comprising a plurality of ladder units and a top platform, the ladder units adjacent to each other above and below can be connected, and the top platform is installed on the top of the uppermost ladder unit; the ladder unit comprises two longitudinal rods and a plurality of transverse rods installed on the two longitudinal rods, and extension rods are provided on the two longitudinal rods extending toward each other; an auxiliary device is installed at the end of the extension rod, or an auxiliary device is installed at the end of the extension rod, and an auxiliary device is also installed at the bottom of the longitudinal rod of the ladder unit at the lowermost end; the auxiliary device comprises a magnetic suction seat or a fixed seat.

[0005] The longitudinal rods of the upper and lower adjacent ladder units are sleeved, and the two upper and lower adjacent longitudinal rods are respectively provided with through holes at the overlapping positions of the sleeves, and the first limit pin passes through the through holes.

[0006] The magnetic seat comprises a switch-type magnetic seat, which is used to be installed on the end of the extension rod and the bottom of the longitudinal rod of the ladder unit at the lower end.

[0007] The magnetic seat also includes a first insertion rod, which is threaded and fixedly installed on the switch-type magnetic seat. The first insertion rod is provided with a first connecting hole. The first insertion rod is used to be inserted into the end of the extension rod and into the bottom of the longitudinal rod of the ladder unit at the lowest end; wherein, after the first insertion rod is inserted into the end of the extension rod, the second limit pin passes through the first connecting hole and the corresponding hole on the extension rod.

[0008] The fixing seat includes a connecting plate and a second insertion rod, the second insertion rod is fixedly mounted on one side of the connecting plate, a mounting hole is provided on the connecting plate, a second connecting hole is provided on the second insertion rod, and the second insertion rod is used to be inserted into the end of the extending rod and into the bottom of the longitudinal rod of the lowest end of the ladder unit; wherein, after the second insertion rod is inserted into the end of the extending rod, the second limit pin passes through the second connecting hole and the corresponding hole on the extending rod.

[0009] The top platform comprises a fixed platform, and two connecting pipes are arranged at the bottom of the fixed platform. The two connecting pipes are sleeved with the tops of the two longitudinal rods of the uppermost ladder unit, and a third limiting pin is inserted at the overlapping part of the sleeves of the connecting pipes and the longitudinal rods.

[0010] The fixed platform includes a first frame, a second frame and a first support plate, both ends of the two second frames are fixedly connected to the first frame respectively, and the first support plate is connected to the area enclosed by the first frame and the second frame;

[0011] The top platform also includes a sliding platform, which includes a third frame and a second support plate, and the second support plate is connected and fixed to the two third frames;

[0012] The second frame is axially provided with a slide groove, and the two third frames are slidably installed in the slide grooves of the second frames on both sides.

[0013] Handles are installed on the second frame or on both sides of the second support plate located on the second frame.

[0014] The two ends of the cross bar are respectively provided with bent sections, and the cross bar is respectively installed on the two sides of the two longitudinal bars.

[0015] The utility model has the following beneficial effects:

[0016] 1. The utility model platform ladder has a plurality of ladder units, which can be connected and extended according to the maintenance position. The two longitudinal rods of the ladder unit are provided with extension rods, and the ends of the extension rods are installed with auxiliary devices, which can be connected with the inner wall of the transformer shell through the auxiliary devices, so that the platform ladder can be conveniently set up to the maintenance position. The top of the uppermost ladder unit is installed with a top platform, which is convenient for maintenance of the transformer coil group pressure plate and other parts, or for operators to stand or sit for long-term maintenance.

[0017] 2. The top platform of the utility model also includes a sliding platform, which includes a third frame and a second support plate, and the second support plate is connected and fixed to the two third frames. The second frame is axially provided with a slide groove, and the two third frames are respectively slidably installed in the slide grooves of the second frames on both sides. The top platform is retracted and extended, and after the sliding platform is extended, it is convenient to approach the inner wall of the transformer oil tank and the transformer body.

[0018] 3. The utility model has curved sections at both ends of the crossbar, which are installed on both sides of the two longitudinal bars. During maintenance, a GCM laminated wood board is laid on the crossbars on both sides. People can stand on the wood board after entering the crossbars on both sides. The height can also be adjusted by moving the wood board as needed, which is convenient for maintenance. Moreover, people are located in the crossbars on both sides and will not slide, which is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment of the utility model.

[0021] Figure 2 This is a schematic diagram of the main structure of the first embodiment of the utility model.

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the second embodiment of the utility model.

[0023] Figure 4 for Figure 1 Enlarged structural diagram at A in the middle.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the magnetic suction seat of the utility model.

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the fixing seat of the utility model.

[0026] Figure 7 for Figure 2 Schematic diagram of the BB section structure.

[0027] Figure 8 This is a schematic diagram of one of the states when the utility model is in use.

[0028] Fig. 9 This is another schematic diagram of the state when the utility model is used.

[0029] In the figure:

[0030] Ladder unit 10, longitudinal rod 11, transverse rod 12, extension rod 13, first limiting pin 14, second limiting pin 15;

[0031] Magnetic seat 20, switch type magnetic seat 21, first insertion rod 22, first connection hole 23;

[0032] A fixing seat 30, a connecting plate 31, a mounting hole 32, a second insertion rod 33, and a second connecting hole 34;

[0033] Top platform 40, fixed platform 41, first frame 411, second frame 412, first support plate 413, connecting pipe 414, third limiting pin 415, slide groove 416, sliding platform 42, third frame 421, second support plate 422, handle 423;

[0034] Transformer 50, transformer box manhole 51. DETAILED DESCRIPTION

[0035] See also Figure 1-9 A platform ladder for internal maintenance of a transformer includes a plurality of ladder units 10 and a top platform 40. The upper and lower adjacent ladder units 10 can be connected, and the top platform 40 is installed on the top of the uppermost ladder unit 10; the ladder unit 10 includes two longitudinal rods 11 and a plurality of transverse rods 12 installed on the two longitudinal rods 11, and the two longitudinal rods 11 are provided with extension rods 13 extending toward each other; an auxiliary device is installed at the end of the extension rod 13, or an auxiliary device is installed at the end of the extension rod 13, and an auxiliary device is also installed at the bottom of the longitudinal rod 11 of the lowermost ladder unit 10; the auxiliary device includes a magnetic suction seat 20 or a fixed seat 30.

[0036] The platform ladder has a plurality of ladder units 10, which can be connected and extended according to the maintenance position. An extension rod 13 is provided on the two longitudinal rods 11 of the ladder unit 10, and an auxiliary device is installed at the end of the extension rod 13. Through the auxiliary device, it can be connected to the inner wall of the transformer shell, so that the platform ladder can be conveniently set up at the maintenance position. A top platform 40 is installed on the top of the uppermost ladder unit 10, which is convenient for entering the top of the transformer, or for operators to stand or sit during long-term maintenance.

[0037] exist Figure 1 , 8 In FIG. 1 , a platform ladder is shown docked with three ladder units 10. Fig. 9 In FIG. 1 , a platform ladder with two ladder units 10 docked thereto is shown.

[0038] In a preferred embodiment, the longitudinal rods 11 of the upper and lower adjacent ladder units 10 are sleeved, and the two upper and lower adjacent longitudinal rods 11 are respectively provided with through holes at the overlapping positions of the sleeves, and the first limit pin 14 passes through the through holes. The installation is simple and convenient, and the connection is firm.

[0039] During manufacturing, the longitudinal rod 11 is made of a pipe, such as an aluminum alloy pipe. One end of the longitudinal rod 11 is in a normal state, and the other end is subjected to a shrinking treatment, that is, the outer diameter of the pipe is reduced by a pressure shrinking device, so that the end after the shrinking treatment can be inserted into the end of the longitudinal rod 11 that has not been subjected to the shrinking treatment. Then, the first stop pin 14 is radially inserted and installed at the overlapping part of the sleeve joint so that the overlapping part of the sleeve joint will not fall out.

[0040] In a preferred embodiment, the magnetic seat 20 includes a switch-type magnetic seat 21, which is used to be installed on the end of the extension rod 13 and the bottom of the longitudinal rod 11 of the lower ladder unit 10. The switch-type magnetic seat 21 is a prior art, and a threaded hole is provided on the top of the switch-type magnetic seat 21. A screw can be provided on the end of the extension rod 13, and the screw is screwed and fixed to the threaded hole on the top of the switch-type magnetic seat 21. When erected, the switch-type magnetic seat 21 is used to be adsorbed to the inner wall of the transformer box. When installed to the bottom of the longitudinal rod 11, a screw with a length of about 150 mm is screwed into the threaded hole on the top of the switch-type magnetic seat 21, and the screw is inserted into the bottom of the longitudinal rod 11. The longitudinal rod 11 falls on the switch-type magnetic seat 21, and the switch-type magnetic seat 21 at the lower end of the longitudinal rod 11 is magnetically connected to the bottom of the transformer.

[0041] For further information, see Figure 1 , 2 5. The magnetic seat 20 also includes a first insertion rod 22, which is threaded and fixedly installed on the switch-type magnetic seat 21. The first insertion rod 22 is provided with a first connection hole 23. The first insertion rod 22 is used to be inserted into the end of the extension rod 13 and into the bottom of the longitudinal rod 11 of the lowest ladder unit 10; wherein, after the first insertion rod 22 is inserted into the end of the extension rod 13, the second limit pin 15 passes through the first connection hole 23 and the corresponding hole on the extension rod 13. Through the above structure, the magnetic seat 20 can be easily installed. Specifically, a screw is provided at the lower end of the first insertion rod 22, and the first insertion rod 22 is fixedly screwed with the thread on the switch-type magnetic seat 21 through the screw at the lower end. In order to prevent the first insertion rod 22 from loosening, a thread fastening glue is coated on the screw.

[0042] See also Figure 3 , 6The fixing seat 30 includes a connecting plate 31 and a second insertion rod 33. The second insertion rod 33 is fixedly mounted on one side of the connecting plate 31. The connecting plate 31 is provided with a mounting hole 32. The second insertion rod 33 is provided with a second connection hole 34. The second insertion rod 33 is used to be inserted into the end of the extension rod 13 and the bottom of the longitudinal rod 11 of the lowest ladder unit 10. After the second insertion rod 33 is inserted into the end of the extension rod 13, the second stop pin 15 passes through the second connection hole 34 and the corresponding hole on the extension rod 13. The above structure facilitates the installation of the fixing seat 30. Specifically, when the fixing seat 30 is installed at the bottom of the longitudinal rod 11, the force bearing area of ​​the longitudinal rod 11 is increased to improve stability. When the transformer box is made of anti-magnetic steel, or the inner wall is covered with copper or aluminum plates, the switch type magnetic seat 21 cannot be stably adsorbed to the inner wall of the transformer box, and it is necessary to use the nut holes specially provided on the box wall. These nut holes are set when the transformer is manufactured, and the nut holes correspond to the mounting holes 32 on the connecting plate 31. During installation, the threaded end of the screw passes through the mounting hole 32 and is screwed into the nut hole, thereby fixing the fixing seat 30 to the inner wall of the transformer box.

[0043] See also Figure 4 , 7 The top platform 40 includes a fixed platform 41, and two connecting pipes 414 are arranged at the bottom of the fixed platform 41. The two connecting pipes 414 are sleeved with the tops of the two longitudinal rods 11 of the uppermost ladder unit 10, and a third stop pin 415 is inserted into the overlapping portion between the connecting pipes 414 and the longitudinal rods 11. Through the above structure, the fixed platform 41 and the ladder unit 10 are quickly connected. Specifically, the two connecting pipes 414 are inserted into the two longitudinal rods 11 of the uppermost ladder unit 10, and a through hole is arranged at the overlapping portion between the connecting pipes 414 and the longitudinal rods 11, and the third stop pin 415 is inserted into the through hole.

[0044] In addition, the first limiting pin 14, the second limiting pin 15 and the third limiting pin 415 may also be bolts.

[0045] When the top of the transformer needs to be inspected for a long time, a person can stand on the fixed platform 41 or sit on the fixed platform.

[0046] Furthermore, the fixed platform 41 includes a first frame 411, a second frame 412 and a first support plate 413, the two ends between the two second frames 412 are respectively fixedly connected with the first frame 411, and the first support plate 413 is connected to the area enclosed by the first frame 411 and the second frame 412. The top platform 40 also includes a sliding platform 42, and the sliding platform 42 includes a third frame 421 and a second support plate 422, and the second support plate 422 is connected and fixed to the two third frames 421. The second frame 412 is axially provided with a slide groove 416, and the two third frames 421 are respectively slidably installed in the slide grooves 416 of the second frames 412 on both sides. Through the above structure, the extension and retraction of the top platform 40 is realized, see Figure 8 After the sliding platform 42 is extended, it is convenient to reach the top of the transformer.

[0047] See also Figure 4 A handle 423 is installed on the second frame 412 or on both sides of the second support plate 422 located at the second frame 412. The handle 423 is used to facilitate carrying and operation of the sliding platform 42 to extend and retract.

[0048] See also Figure 1 , curved sections are respectively arranged at both ends of the crossbar 12, and the crossbar 12 is respectively installed on both sides of the two longitudinal bars 11. Through the above structure, during maintenance, a GCM laminated wood board is laid on the crossbars 12 on both sides, and people can stand on the wood board after entering the crossbars 12 on both sides, and can also move the wood board to adjust the height as needed, which is convenient for maintenance, and people are located in the crossbars 12 on both sides and will not slide, which is safer.

[0049] The working principle or action process of the utility model is as follows:

[0050] See also Figure 8 , 9 , Figure 8 The figure shows the state where the transformer box is separated from the transformer. In actual maintenance, the transformer box surrounds the transformer, and the platform ladder is located inside the transformer box.

[0051] During maintenance, a ladder unit 10 is first inserted into the transformer through the transformer box manhole 51. After installing the auxiliary device at the bottom of the ladder unit 10 and the auxiliary device at the end of the extension rod 13, the first ladder unit 10 is fixed, and then the second ladder unit 10 or the third ladder unit 10 is installed as needed, and the top platform 40 is installed on the top of the uppermost ladder unit 10.

[0052] During maintenance, GCM laminated wood boards are laid on the cross bars 12 on both sides. People can stand on the boards after entering the cross bars 12 on both sides. The GCM laminated wood boards can also be moved to adjust the height as needed to facilitate maintenance. Moreover, people are located in the cross bars 12 on both sides and will not slip, which is safer.

[0053] When the top of the transformer needs to be inspected for a long time, a person can stand on the fixed platform 41 or sit on the fixed platform.

[0054] In addition, after the sliding platform 42 is extended, the end of the sliding platform 42 away from the ladder unit 10 is placed on the transformer coil assembly pressure plate, see Figure 8 , so that the operators can come to the upper part of the transformer coil group pressure plate for maintenance, see Fig. 9 , which makes it convenient for operators to inspect and repair the area around the coil assembly pressure plate.

Claims

1. A platform ladder for internal maintenance of a transformer, characterized in that: The invention comprises a plurality of ladder units (10) and a top platform (40), wherein the ladder units (10) adjacent to each other can be butted against each other, and the top platform (40) is mounted on the top of the ladder unit (10) at the top; the ladder unit (10) comprises two longitudinal rods (11) and a plurality of transverse rods (12) mounted on the two longitudinal rods (11), and the two longitudinal rods (11) are provided with extension rods (13) extending towards each other; an auxiliary device is mounted on the end of the extension rod (13), or an auxiliary device is mounted on the end of the extension rod (13), and an auxiliary device is also mounted on the bottom of the longitudinal rod (11) of the ladder unit (10) at the bottom; the auxiliary device comprises a magnetic seat (20) or a fixed seat (30).

2. A platform ladder for internal maintenance of a transformer according to claim 1, characterized in that: The longitudinal rods (11) of the upper and lower adjacent ladder units (10) are sleeved, and the two upper and lower adjacent longitudinal rods (11) are respectively provided with through holes at the overlapping positions of the sleeves, and the first limit pin (14) passes through the through holes.

3. A platform ladder for internal maintenance of a transformer according to claim 1, characterized in that: The magnetic seat (20) comprises a switch-type magnetic seat (21), and the switch-type magnetic seat (21) is used to be installed on the end of the extension rod (13) and the bottom of the longitudinal rod (11) of the ladder unit (10) at the lower end.

4. A platform ladder for internal maintenance of a transformer according to claim 3, characterized in that: The magnetic seat (20) further comprises a first insertion rod (22), the first insertion rod (22) being threadedly fixedly mounted on the switch-type magnetic seat (21), the first insertion rod (22) being provided with a first connection hole (23), the first insertion rod (22) being used to be inserted into the end of the extension rod (13) and into the bottom of the longitudinal rod (11) of the lowest end of the ladder unit (10); wherein, after the first insertion rod (22) is inserted into the end of the extension rod (13), the second limit pin (15) passes through the first connection hole (23) and the corresponding hole on the extension rod (13).

5. The platform ladder for transformer internal maintenance according to claim 1, characterized in that: The fixing seat (30) comprises a connecting plate (31) and a second insertion rod (33), wherein the second insertion rod (33) is fixedly mounted on one side of the connecting plate (31), wherein the connecting plate (31) is provided with a mounting hole (32), and the second insertion rod (33) is provided with a second connecting hole (34), wherein the second insertion rod (33) is used to be inserted into the end of the extension rod (13) and into the bottom of the longitudinal rod (11) of the lowest end of the ladder unit (10); wherein after the second insertion rod (33) is inserted into the end of the extension rod (13), the second limiting pin (15) passes through the second connecting hole (34) and the corresponding hole on the extension rod (13).

6. The platform ladder for transformer internal maintenance according to claim 1, characterized in that: The top platform (40) comprises a fixed platform (41), and two connecting pipes (414) are arranged at the bottom of the fixed platform (41), and the two connecting pipes (414) are sleeved with the tops of two longitudinal rods (11) of the uppermost ladder unit (10), and a third limit pin (415) is inserted into the overlapping part of the sleeve connection between the connecting pipe (414) and the longitudinal rod (11).

7. A platform ladder for internal maintenance of a transformer according to claim 6, characterized in that: The fixed platform (41) comprises a first frame (411), a second frame (412) and a first support plate (413); both ends of the two second frames (412) are respectively fixedly connected to the first frame (411); and the first support plate (413) is connected to an area enclosed by the first frame (411) and the second frame (412); The top platform (40) further comprises a sliding platform (42), the sliding platform (42) comprises a third frame (421) and a second support plate (422), the second support plate (422) being connected and fixed to the two third frames (421); The second frame (412) is axially provided with a sliding groove (416), and the two third frames (421) are slidably mounted in the sliding grooves (416) of the second frames (412) on both sides.

8. The platform ladder for transformer internal maintenance according to claim 7, characterized in that: Handles (423) are installed on the second frame (412), or on both sides of the second support plate (422) of the second frame (412).

9. The platform ladder for transformer internal maintenance according to claim 1, characterized in that: The two ends of the cross bar (12) are respectively provided with bent sections, and the cross bar (12) is respectively mounted on both sides of the two longitudinal bars (11).

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