Overhaul mechanism for expansion joint of hydropower station

Abstract

The invention provides a hydropower station expansion joint maintenance mechanism which comprises two supports and a center cylinder rotatably connected between the two supports, the center cylinder takes the axis of the center cylinder as a rotating shaft, the two supports are both arranged on the inner walls of inner sleeves on the two sides of a guide cylinder, the center cylinder is parallel to the axis of an expansion joint, and the center cylinder is arranged on the guide cylinder. The distance between the axis of the center cylinder and the axis of the telescopic joint is smaller than 10 cm, a driving wheel is fixedly arranged at one end of the center cylinder, the overhauling mechanism further comprises a driving assembly for driving the driving wheel to rotate, and the outer wall of the center cylinder is connected with a first long arm and a second long arm in a manner of extending in the radial direction of the center cylinder. A working assembly is arranged at the end, away from the center cylinder, of the first long arm, and a dismounting assembly is arranged at the end, away from the center cylinder, of the second long arm. According to the maintenance mechanism for the expansion joint of the hydropower station provided by the invention, the guide cylinder can be quickly detached from the expansion joint by a worker and can be conveniently mounted, so that the maintenance efficiency of the expansion joint is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of expansion joint maintenance, in particular to a kind of expansion joint maintenance mechanism of hydropower station. BACKGROUND

[0002] In the maintenance operation of expansion joint, the current generally faces the prominent problem of disassembly difficulty.

[0003] In terms of disassembly difficulty, expansion joint is long-term in complex working condition environment, such as water scouring, temperature alternation change, etc., so that rusting, adhesion phenomenon is easy to occur between its parts. In addition to the particularity of the structure design of expansion joint, the space of part of connecting position is small, and the tool is difficult to accurately force when manually operated, which further aggravates the disassembly difficulty. Often need to cooperate with multiple people, repeatedly force with the help of multiple auxiliary tools, can be gradually disassembled, not only the labor intensity is big, but also the expansion joint body can be damaged unnecessarily due to improper operation.

[0004] This disassembly difficulty condition can directly lead to that the maintenance work of expansion joint occupies a large amount of time, and then affects the normal operation of related equipment and even the whole system. For example, in some industrial production lines, if the fault maintenance of expansion joint takes too long time, the production line will be shut down for a long time, which will bring huge economic loss. SUMMARY

[0005] The embodiment of the present application provides a kind of expansion joint maintenance mechanism of hydropower station to solve the problem of disassembly difficulty of expansion joint in prior art.

[0006] To achieve the above object, the technical scheme adopted by the embodiment of the present application is as follows: an expansion joint maintenance mechanism of hydropower station is used for disassembling and assembling the draft tube of expansion joint. The draft tube is surrounded by a plurality of arc-shaped guide plates to form a cylindrical shape. The expansion joint maintenance mechanism of hydropower station comprises two supports and a central cylinder rotatably connected between the two supports. The central cylinder takes its own axis as the rotation axis. Both supports are arranged on the inner wall of the inner sleeve on both sides of the draft tube. The central cylinder is parallel to the axis of the expansion joint, and the distance between the axis of the central cylinder and the axis of the expansion joint is less than 10 cm. One end of the central cylinder is fixedly provided with a driving wheel. The maintenance mechanism further comprises a driving assembly for driving the rotation of the driving wheel. The outer wall of the central cylinder is connected with a first long arm and a second long arm extending along the radial direction of the central cylinder. The first long arm is provided with a working assembly at the end away from the central cylinder. The second long arm is provided with a dismounting assembly at the end away from the central cylinder.

[0007] The working assembly comprises a first lifting platform and a plurality of maintenance devices arranged at the moving part of the first lifting platform. The first lifting platform is arranged at the end of the first long arm away from the central cylinder. The first lifting platform moves the maintenance devices along the radial direction of the central cylinder.

[0008] The dismounting assembly comprises a second lifting platform and a plurality of top rods arranged at the moving position of the second lifting platform, the second lifting platform moves the top rods along the radial direction of the central cylinder, a hanging rod is connected between the top rods, a workbench is rotatably hung on the hanging rod, the axis of the hanging rod is parallel to the axis of the central cylinder, a fixing member is arranged at the end of the top rod away from the second lifting platform to fix the relative position of the top rod and the guide cylinder, the top of the workbench has an opening for the worker to operate, and in the process of rotating the second lifting platform around the central cylinder, the workbench will rotate around the hanging rod under the action of its own gravity, so that the opening of the workbench is always directed upward.

[0009] Further, the axis of the central cylinder coincides with the axis of the telescopic joint.

[0010] Further, a plurality of support rods are connected between the top rods, and the plurality of top rods and the plurality of support rods are connected into a frame structure.

[0011] Further, the second lifting platform comprises a driving member, a guide rail, a scissor arm and a moving member, the scissor arm has a plurality of scissor arms, the plurality of scissor arms are hingedly connected to form a cross-link mechanism, the axis lines of all the hinged points of the scissor arm are parallel, one end of the scissor arm is slidably connected with the guide rail, the guide rail limits the one end of the scissor arm to only move horizontally, the output end of the driving member is hingedly connected with the scissor arm, the top end of the scissor arm is hingedly connected with the bottom of the moving member, the bottom of the scissor arm is hingedly connected with the one end of the first long arm away from the central cylinder, the driving member is arranged at the one end of the first long arm away from the central cylinder, and the first lifting platform and the second lifting platform have the same structure.

[0012] Further, the driving assembly comprises a friction wheel and a motor for driving the rotation of the friction wheel, the outer wall of the friction wheel abuts against the outer wall of the driving wheel, and when the friction wheel rotates, the driving wheel rotates simultaneously.

[0013] Further, the driving assembly further comprises a speed reducer arranged between the output shaft of the motor and the friction wheel, and the speed reducer is used to control the rotation speed and torque of the friction wheel.

[0014] Further, the support is spliced by a plurality of steel pipes, two adjacent steel pipes are connected through a male head and a female head, the driving wheel comprises a wheel body and a plurality of spokes, the wheel body is formed by a plurality of arc-shaped plates spliced to form a closed circular structure, the spokes are arranged along the radial direction of the driving wheel, and the spokes are fixedly connected with the wheel body and the central cylinder.

[0015] Further, the support is a triangular support, and the central cylinder is arranged at the top corner of the support.

[0016] Further, a servo motor is arranged between each maintenance device and the first lifting platform, the servo motor pushes the first lifting platform to linearly move, so that each maintenance device can change its position according to the different maintenance positions.

[0017] Further, the bottom of the workbench is provided with a counterweight.

[0018] The beneficial effects of the present application are:

[0019] The water power station expansion joint overhauling mechanism provided by the present application can quickly detach the guide cylinder from the expansion joint and conveniently install the guide cylinder, thereby improving the overhauling efficiency of the expansion joint and providing convenience for the use of workers. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Fig. 4 is a structural schematic view of the water power station expansion joint overhauling mechanism in the expansion joint;

[0021] Figure 2 Fig. 5 is a perspective view of the water power station expansion joint overhauling mechanism;

[0022] Figure 3 Fig. 6 is a structural schematic view of the dismounting assembly;

[0023] Figure 4 Fig. 7 is a structural schematic view of the driving assembly.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1, support; 2, center tube; 3, driving wheel; 4, driving assembly; 41, speed reducer; 42, motor; 43, friction wheel; 5, first long arm; 6, working assembly; 61, first lifting platform; 62, overhauling device; 7, dismounting assembly; 71, second lifting platform; 711, driving piece; 712, scissor arm; 713, moving piece; 714, guide rail; 72, jacking rod; 73, supporting rod; 74, fixing piece; 75, workbench; 76, hanging rod; 8, expansion joint; 81, guide cylinder; 82, inner sleeve; 9, second long arm. DETAILED DESCRIPTION

[0026] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0027] As Figures 1-4As shown, the water power station expansion joint overhauling mechanism provided by the embodiment of the application is used for disassembling and assembling the guide cylinder 81 of the expansion joint 8, the guide cylinder 81 is surrounded by a plurality of arc-shaped guide plates into a cylindrical shape, the water power station expansion joint overhauling mechanism comprises two supports 1 and a central cylinder 2 rotatably connected between the two supports 1, the central cylinder 2 takes its own axis as a rotating shaft, the two supports 1 are arranged on the inner walls of the inner sleeves 82 on both sides of the guide cylinder 81, the central cylinder 2 is parallel to the axis of the expansion joint 8 (in a preferred embodiment, the axis of the central cylinder 2 coincides with the axis of the expansion joint 8), and the distance between the axis of the central cylinder 2 and the axis of the expansion joint 8 is less than 10 cm, (the expansion joint 8 has a plurality of embodiments in the prior art, and the specific structure of the expansion joint 8 is not described here), one end of the central cylinder 2 is fixedly provided with a driving wheel 3, the overhauling mechanism further comprises a driving assembly 4 for driving the driving wheel 3 to rotate, a first long arm 5 and a second long arm 9 are connected to the outer wall of the central cylinder 2 along the radial direction of the central cylinder 2, a working assembly 6 is arranged at the end of the first long arm 5 away from the central cylinder 2, and a disassembling assembly 7 is arranged at the end of the second long arm 9 away from the central cylinder 2;

[0028] The working assembly 6 comprises a first lifting platform 61 and a plurality of overhauling devices 62 arranged at the moving position of the first lifting platform 61 (the overhauling devices 62 comprise a flaw detection head, a welding head, a spraying head and a plurality of working heads), the first lifting platform 61 is arranged at the end of the first long arm 5 away from the central cylinder 2, and the first lifting platform 61 moves the overhauling devices 62 along the radial direction of the central cylinder 2;

[0029] The disassembling assembly 7 comprises a second lifting platform 71 and a plurality of jacks 72 arranged at the moving position of the second lifting platform 71, the second lifting platform 71 moves the jacks 72 along the radial direction of the central cylinder 2, a hanging rod 76 is connected between the jacks 72, a workbench 75 is rotatably hung on the hanging rod 76, and the axis of the hanging rod 76 is parallel to the axis of the central cylinder 2; in order to strengthen the structural stability of the disassembling assembly 7, a plurality of supporting rods 73 are connected between the jacks 72, and the plurality of jacks 72 and the plurality of supporting rods 73 are connected into a frame structure; a fixing piece 74 (the fixing piece 74 comprises a plurality of fixing pieces such as bolts and screws) for fixing the relative positions of the jacks 72 and the guide cylinder 81 is arranged at the end of the jacks 72 away from the second lifting platform 71, the top of the workbench 75 has an opening for workers to operate, and in the process of rotating the second lifting platform 71 around the central cylinder 2, the workbench 75 will rotate around the hanging rod 76 under the action of its own gravity, so that the opening of the workbench 75 is always directed upward.

[0030] In an embodiment, the second lifting platform 71 comprises a driving member 711, a guide rail 714, a scissor arm 712 and a moving member 713 (in a specific embodiment, the moving member 713 is a platform for carrying objects), the scissor arm 712 has a plurality of scissor arms 712 which are hinged by pins to form a cross-link mechanism, and the shaft center lines of all the hinge points of the scissor arm 712 are parallel, one end of the scissor arm 712 is slidably connected with the guide rail 714, the guide rail 714 limits the one end of the scissor arm 712 to be able to move only laterally, the output end of the driving member 711 is hinged with the scissor arm 712, the top end of the scissor arm 712 is hinged with the bottom of the moving member 713, the bottom of the scissor arm 712 is hinged with the end of the first long arm 5 away from the center tube 2, the driving member 711 is arranged at the end of the first long arm 5 away from the center tube 2, when the driving member 711 pushes the cross point of the scissor arm 712, the scissor arm 712 rotates around the pin, driving the moving member 713 to vertically rise (when unfolded) or fall (when folded), the driving member 711 can be a servo motor or a hydraulic cylinder (when the driving member 711 is a hydraulic cylinder: the hydraulic pump works, pumping hydraulic oil from the oil tank into the hydraulic cylinder (the oil path direction is controlled by the reversing valve), the hydraulic cylinder piston rod extends, pushing the cross point of the scissor arm 712 to unfold outward; when the driving member 711 is a servo motor: the servo motor drives the ball screw to rotate through the speed reducer, the screw nut moves along the screw shaft, driving the scissor arm 712 to rotate around the hinge point), and the structure of the first lifting platform 61 and the second lifting platform 71 is the same.

[0031] In use, the worker enters the workbench 75, the driving assembly 4 is started, driving the driving wheel 3 to rotate, thereby driving the second long arm 9, the center tube 2 and the first long arm 5 to rotate, and driving the second lifting platform 71 to rotate to a position where the top rod 72 can abut against the guide vane to be disassembled along the radial direction of the center tube 2, the driving member 711 of the second lifting platform 71 is started, when the driving member 711 pushes the cross point of the scissor arm 712, the scissor arm 712 rotates around the pin, driving the moving member 713 to vertically rise (when unfolded) or fall (when folded), so that the top rod 72 moves along the radial direction of the center tube 2, so that the top rod 72 abuts against the guide vane to be disassembled, then the relative position of the guide vane and the top rod 72 is fixed by the fixing member 74, and the guide vane is disassembled, the driving wheel 3 continues to rotate, so that the guide vane follows the top rod 72 to rotate, until it moves below the maintenance mechanism, other workers disassemble the guide vane from the maintenance mechanism, and the guide vanes are sequentially disassembled one by one, until the entire guide cylinder 81 is disassembled from the expansion joint 8, at this time, the driving wheel 3 continues to rotate, the first lifting platform 61 moves the maintenance device 62 to the connection position of the guide cylinder 81 and the inner sleeve 82, so that the maintenance device 62 can perform processes such as flaw detection, welding and spraying on the connection between the guide cylinder 81 and the inner sleeve 82, thereby completing the maintenance of the expansion joint 8.

[0032] The driving assembly 4 comprises a friction wheel 43 and a motor 42 driving the friction wheel 43 to rotate, and the outer wall of the friction wheel 43 is in abutment with the outer wall of the driving wheel 3, so that the driving wheel 3 is driven to rotate when the friction wheel 43 rotates; in order to enable the staff to accurately control the rotation angle or the number of rotations of the driving wheel 3, in an embodiment of the present application, the driving assembly 4 further comprises a speed reducer 41 arranged between the output shaft of the motor 42 and the friction wheel 43, and the speed reducer 41 is used to control the rotation speed and torque of the friction wheel 43 (the speed reducer 41 has various embodiments in the prior art, and the specific structure of the speed reducer 41 is not described here).

[0033] In order to facilitate the movement of the maintenance mechanism and the installation in the telescopic joint 8, in an embodiment of the present application, the support 1 is spliced by a plurality of steel pipes, two adjacent steel pipes are connected through a male head and a female head, the driving wheel 3 comprises a wheel body and a plurality of spokes, the wheel body is formed by a plurality of arc-shaped plates spliced to form a closed circular structure, the spokes are arranged along the radial direction of the driving wheel 3, and the spokes are fixedly connected to the wheel body and the central cylinder 2.

[0034] In order to increase the stability of the support 1, in an embodiment of the present application, the support 1 is a triangular support, and the central cylinder 2 is arranged at the top corner of the support 1.

[0035] In order to adapt to the deviation of different maintenance positions on the telescopic joint 8, in an embodiment of the present application, a servo motor is arranged between each maintenance device 62 and the first lifting platform 61, the servo motor drives the first lifting platform 61 to move linearly, so that each maintenance device 62 can change its position according to the different maintenance positions.

[0036] In order to keep the opening of the workbench 75 facing upward during rotation, in an embodiment of the present application, a counterweight is arranged at the bottom of the workbench 75, so as to lower the center of gravity of the workbench 75 and enhance the stability thereof.

[0037] The telescopic joint maintenance mechanism of the hydropower station enables the staff to quickly disassemble the guide cylinder 81 from the telescopic joint 8 and conveniently install the guide cylinder 81, thereby improving the maintenance efficiency of the telescopic joint 8 and providing convenience for the staff.

[0038] The above-described embodiments only express the implementation of the present application, but cannot be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A maintenance mechanism for a hydropower station expansion joint, used for disassembling and assembling the guide tube (81) of the expansion joint (8), the guide tube (81) being formed into a cylindrical shape by multiple arc-shaped guide plates, characterized in that, The maintenance mechanism for the expansion joint of the hydropower station includes two supports (1) and a central cylinder (2) rotatably connected between the two supports (1). The central cylinder (2) rotates around its own axis. Both supports (1) are set on the inner wall of the inner sleeve (82) on both sides of the guide tube (81). The central cylinder (2) is parallel to the axis of the expansion joint (8), and the distance between the axis of the central cylinder (2) and the axis of the expansion joint (8) is less than 10cm. A drive wheel (3) is fixedly installed at one end of the central cylinder (2). The maintenance mechanism also includes a drive assembly (4) for driving the drive wheel (3) to rotate. A first long arm (5) and a second long arm (9) are connected to the outer wall of the central cylinder (2) along the radial direction of the central cylinder (2). A working assembly (6) is installed at the end of the first long arm (5) away from the central cylinder (2), and a disassembly assembly (7) is installed at the end of the second long arm (9) away from the central cylinder (2). The working assembly (6) includes a first lifting platform (61) and a plurality of maintenance devices (62) disposed on the moving part of the first lifting platform (61). The first lifting platform (61) is disposed at one end of the first long arm (5) away from the central cylinder (2). The first lifting platform (61) causes the maintenance devices (62) to move radially along the central cylinder (2). The disassembly assembly (7) includes a second lifting platform (71) and multiple push rods (72) located on the moving part of the second lifting platform (71). The second lifting platform (71) causes the push rods (72) to move radially along the central cylinder (2). A hanging rod (76) is connected between the push rods (72). A worktable (75) is rotatably suspended on the hanging rod (76). The axis of the hanging rod (76) is parallel to the axis of the central cylinder (2). A fixing member (74) is provided at the end of the push rod (72) away from the second lifting platform (71) to fix the relative position of the push rod (72) and the guide cylinder (81). The top of the worktable (75) has an opening for workers to operate. During the rotation of the second lifting platform (71) around the central cylinder (2), the worktable (75) will rotate around the hanging rod (76) under its own weight, so that the opening of the worktable (75) always faces upward.

2. The hydropower station expansion joint maintenance mechanism according to claim 1, characterized in that, The axis of the central cylinder (2) coincides with the axis of the expansion joint (8).

3. The hydropower station expansion joint maintenance mechanism according to claim 1, characterized in that, Multiple support rods (73) are connected between the top rods (72), and the multiple top rods (72) and multiple support rods (73) are connected to form a frame structure.

4. The hydropower station expansion joint maintenance mechanism according to claim 1, characterized in that, The second lifting platform (71) includes a drive unit (711), a guide rail (714), scissor arms (712), and a moving unit (713). Multiple scissor arms (712) are hinged together by pins to form a cross-link mechanism. The axis lines of all hinge points of the scissor arms (712) are parallel. One end of each scissor arm (712) is slidably connected to the guide rail (714), which restricts the scissor arms (712). One end can only move laterally. The output end of the drive member (711) is hinged to the scissor arm (712). The top end of the scissor arm (712) is hinged to the bottom of the moving member (713). The bottom of the scissor arm (712) is hinged to the end of the first long arm (5) away from the central cylinder (2). The drive member (711) is located at the end of the first long arm (5) away from the central cylinder (2). The first lifting platform (61) and the second lifting platform (71) have the same structural composition.

5. The hydropower station expansion joint maintenance mechanism according to claim 1, characterized in that, The drive assembly (4) includes a friction wheel (43) and a motor (42) that drives the friction wheel (43) to rotate. The outer wall of the friction wheel (43) abuts against the outer wall of the drive wheel (3). When the friction wheel (43) rotates, it drives the drive wheel (3) to rotate simultaneously.

6. The hydropower station expansion joint maintenance mechanism according to claim 5, characterized in that, The drive assembly (4) also includes a speed reducer (41) disposed between the output shaft of the motor (42) and the friction wheel (43), the speed reducer (41) being used to control the speed and torque of the friction wheel (43).

7. The hydropower station expansion joint maintenance mechanism according to claim 1, characterized in that, The bracket (1) is made of multiple steel pipes spliced ​​together. Two adjacent steel pipes are connected by a male and a female head. The drive wheel (3) includes a wheel body and spokes. The wheel body is formed by splicing multiple arc plates to form a closed circular structure. There are multiple spokes, and the spokes are arranged radially along the drive wheel (3). The spokes are fixedly connected to the wheel body and the central cylinder (2).

8. The hydropower station expansion joint maintenance mechanism according to claim 1, characterized in that, The bracket (1) is a triangular bracket, and the central cylinder (2) is set at the top corner of the bracket (1).

9. The hydropower station expansion joint maintenance mechanism according to claim 1, characterized in that, A servo motor is provided between each maintenance device (62) and the first lifting platform (61). The servo motor drives the first lifting platform (61) to move linearly, so that each maintenance device (62) can change its position according to the different maintenance positions.

10. The hydropower station expansion joint maintenance mechanism according to claim 1, characterized in that, The bottom of the workbench (75) is equipped with a counterweight.

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