Dismounting device for lower shaft sleeve of guide vane of water turbine

Abstract

The utility model relates to a water turbine guide vane lower shaft sleeve dismounting device which is provided with a support which is supported on a water turbine bottom ring during use, a lifting shaft is arranged in the support in a penetrating mode, the lower end of the lifting shaft is connected with a supporting piece, limiting blocks are arranged on the two sides of the supporting piece respectively, and outer protrusions are arranged at the bottom ends of the limiting blocks. When the limiting block extends into the inner hole of the lower shaft sleeve during disassembly, the outer protrusion is supported on the bottom end face of the lower shaft sleeve, and when the lifting shaft ascends, the lower shaft sleeve is pulled out through the supporting piece and the limiting block. The limiting block is adopted to support the bottom of the lower shaft sleeve, under the action of the lifting shaft, it can be guaranteed that the lower shaft sleeve is evenly stressed in the whole pulling-out process, the lower shaft sleeve does not incline towards one side, and therefore it is guaranteed that grinding damage does not occur between the lower shaft sleeve and the bottom ring.

Description

Technical Field

[0001] This utility model relates to the field of water turbine installation technology, and in particular to a device for disassembling the lower bushing of a water turbine guide vane. Background Technology

[0002] In the turbine structure, the lower guide vane bushing is installed inside the inner hole of the bottom ring. The two are assembled with a small clearance fit. There is a seal between the inner side of the lower guide vane bushing and the guide vane arm, and between the outer side and the bottom ring, which serves to seal against water. Generally, the lower bushing is made of ZG20SiMn, and the bottom ring is made of Q345C. Due to constant contact with water, there is extensive corrosion between the lower bushing and the bottom ring, making it difficult to remove the lower bushing. In addition, the lower bushing is an integral structure, and the flange on the bushing does not have lifting holes.

[0003] Currently, the conventional method for disassembling the lower bushing is as follows: a T-shaped steel tool with a thickness of 40-50mm is made from ordinary Q235B steel plate, the T-shaped steel tool is matched and spot-welded to the lower bushing, and jacks are used on both sides of the T-shaped steel plate to pull out the lower bushing.

[0004] This disassembly method involves welding the T-shaped steel plate tool to the lower bushing, which is prone to deformation after welding. Since the jack is operated manually, asynchronous support points can lead to uneven force on both sides of the T-shaped steel plate tool, causing uneven stress on the lower bushing and resulting in abrasive damage between the bushing and the bottom ring. In severe cases, this can even cause the T-shaped steel plate tool to break on one side, potentially resulting in personal injury. Therefore, a set of tools is needed to remove the turbine guide vane lower bushing, ensuring even force distribution and preventing abrasive damage during removal. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a disassembly device for the lower bushing of a water turbine guide vane, so as to ensure that the lower bushing is subjected to uniform force during the disassembly process and to prevent grinding damage between it and the bottom ring.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a disassembly device for the lower bushing of a water turbine guide vane, which has a bracket that is supported on the bottom ring of the water turbine during use. A lifting shaft is inserted through the bracket, and a support member is connected to the lower end of the lifting shaft. Limiting blocks are respectively provided on both sides of the support member. The bottom end of the limiting block has an outward protrusion. When disassembling, the limiting block extends into the inner hole of the lower bushing, and the outward protrusion supports the bottom end face of the lower bushing. When the lifting shaft rises, the lower bushing is pulled out through the support member and the limiting block.

[0007] To improve lifting stability, a hydraulic cylinder is installed on the upper end face of the bracket, and the upper end of the lifting shaft is fixedly connected to the piston of the hydraulic cylinder.

[0008] Specifically, the support includes a connecting flange, a connecting head that is movably connected to the lower end of the lifting shaft is fixed on the upper end face of the connecting flange, a support sleeve is fixedly connected to the lower end face of the connecting flange, a support plate is fixedly connected to the bottom of the support sleeve, the upper end of the limiting block is fixedly connected to the connecting flange, and the support plate is supported between the bottom inner sides of the corresponding two limiting blocks.

[0009] Furthermore, the lower end face of the connecting flange has a central boss, and the limiting block is bolted to the outer side of the central boss.

[0010] The beneficial effects of this utility model are: This utility model uses a limiting block to support the bottom of the lower bushing. Under the action of the lifting shaft, it can ensure that the lower bushing is evenly stressed during the overall pulling process and that the lower bushing will not tilt to one side, thereby ensuring that no grinding damage occurs between the lower bushing and the bottom ring. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the usage state of this utility model.

[0014] In the diagram: 1. Hydraulic cylinder, 2. Lifting shaft, 3. Bracket, 4. Support component, 4-1. Connecting flange, 4-2. Connecting head, 4-3. Support sleeve, 4-4. Support plate, 4-5. Central boss, 5. Limiting block, 5-1. Outer protrusion, 6. Bolt, 7. Lower bushing, 8. Bottom ring. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0016] like Figure 1 , Figure 2 The device shown is a disassembly device for the lower shaft sleeve of a water turbine guide vane. It is used to pull the lower shaft sleeve 7 of the water turbine out of the inner hole of the bottom ring 8 during maintenance. The inner hole of the bottom ring 8 is a stepped hole. The outer half of the bottom surface of the lower shaft sleeve 7 abuts against the stepped surface of the inner hole of the bottom ring 8, and the inner half of the bottom surface protrudes from the stepped surface.

[0017] The disassembly device includes a hydraulic cylinder 1, a lifting shaft 2, a bracket 3, a support 4, and a limiting block 5. The bracket 3 is supported on the upper surface of the turbine bottom ring 8 during use. The hydraulic cylinder 1 is installed on the upper surface of the bracket 3. The lifting shaft 2 is located inside the bracket 3, and the upper end of the lifting shaft 2 is fixedly connected to the piston of the hydraulic cylinder 1.

[0018] The support member 4 includes a connecting flange 4-1, a connector 4-2 that is movably connected to the lower end of the lifting shaft 2 is fixed on the upper end face of the connecting flange 4-1, a central boss 4-5 is provided on the lower end face of the connecting flange 4-1, a support sleeve 4-3 is fixed on the central boss 4-5, and a support plate 4-4 is fixed to the bottom of the support sleeve 4-3.

[0019] Limiting blocks 5 are provided on the outer side of the fitting center boss 4-5. The upper end face of the limiting block 5 is fixed to the connecting flange 4-1 by bolts. The support plate 4-4 is supported between the bottom inner sides of the corresponding two limiting blocks 5.

[0020] The bottom end of the limiting block 5 has an outward protrusion 5-1. During disassembly, the limiting block 5 is first inserted into the bottom of the inner hole of the lower bushing 7, so that the outward protrusion 5-1 is supported on the inner bottom surface of the step surface of the lower bushing 7. Then, the support member 4 is placed in the inner hole of the lower bushing, and the support plate 4-4 is supported between the bottom inner surfaces of the two corresponding limiting blocks 5. The limiting block 5 is fixed to the connecting flange 4-1 with bolts 6. The connecting head 4-2 is hinged to the lifting shaft 2. The hydraulic cylinder 1 is started to drive the lifting shaft 2 to rise. The lifting shaft 2 transmits the force to the lower bushing 7 through the limiting block 5, thereby pulling the lower bushing 7 out of the inner hole of the bottom ring 8.

[0021] Since the limiting block 5 is used to support the bottom of the lower bushing 7, under the action of the hydraulic cylinder 1, it can be ensured that the force is uniform during the process of the lifting shaft 2 pulling the lower bushing 7 out as a whole, and the lower bushing 7 will not tilt to one side, thus ensuring that no grinding damage occurs between the lower bushing 7 and the bottom ring 8.

[0022] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A device for disassembling the lower bushing of a turbine guide vane, comprising a bracket (3) supported on the turbine bottom ring (8) during use, characterized in that: The bracket (3) is equipped with a lifting shaft (2), and the lower end of the lifting shaft (2) is connected to a support member (4). The support member (4) is provided with limiting blocks (5) on both sides. The bottom end of the limiting block (5) has an outward protrusion (5-1). When the limiting block (5) is inserted into the inner hole of the lower bushing (7) during disassembly, the outward protrusion (5-1) supports the bottom end face of the lower bushing (7). When the lifting shaft (2) rises, the lower bushing (7) is pulled out through the support member (4) and the limiting block (5).

2. The turbine guide vane lower bushing disassembly device as described in claim 1, characterized in that: A hydraulic cylinder (1) is installed on the upper end face of the bracket (3), and the upper end of the lifting shaft (2) is fixedly connected to the piston of the hydraulic cylinder (1).

3. The turbine guide vane lower bushing disassembly device as described in claim 1, characterized in that: The support member (4) includes a connecting flange (4-1), a connecting head (4-2) that is movably connected to the lower end of the lifting shaft (2) is fixed on the upper end face of the connecting flange (4-1), a support sleeve (4-3) is fixed on the lower end face of the connecting flange (4-1), a support plate (4-4) is fixed on the bottom of the support sleeve (4-3), the upper end of the limiting block (5) is fixed to the connecting flange (4-1), and the support plate (4-4) is supported between the bottom inner sides of the corresponding two limiting blocks (5).

4. The turbine guide vane lower bushing disassembly device as described in claim 3, characterized in that: The lower end face of the connecting flange (4-1) has a central boss (4-5), and the limiting block (5) is fixed to the outer side of the central boss (4-5) and the connecting flange (4-1) by bolts (6).

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