A modified set screw for steam turbine maintenance

Abstract

This utility model relates to the field of set screw technology, specifically disclosing a modified set screw for turbine maintenance, including a set screw assembly, a connecting component at the end of the set screw assembly, and an anti-detachment component on the connecting component; the set screw assembly includes a set screw body; the connecting component includes a connecting rod; and the anti-detachment component includes an anti-detachment plate. This solution completely changes the current situation through an integrated gasket design and a quick-installation anti-detachment component. The gasket, as a supporting structure for the hammer wrench, can stably bear the striking force, while the combination of the anti-detachment plate and the locking sleeve further restricts the wrench's displacement. During operation, only one person is needed to complete the installation and striking of the set screw, reducing manpower requirements and avoiding potential safety accidents during collaboration. The hammer wrench, through the dual limiting of the anti-detachment plate and the gasket, ensures that the striking force is always transmitted along the set screw axis, avoiding uneven loads that could cause thread seizing or deformation of the screw hole.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine cylinder technology in the power industry, and specifically discloses a modified set screw for steam turbine maintenance. Background Technology

[0002] In the power industry, after the screws on the mating surface of the steam turbine cylinder are removed, the mating surface of the cylinder is first opened with a set screw before it is lifted. The set screws are usually arranged in multiple symmetrical ways to ensure that the steam turbine cylinder is lifted horizontally. They are characterized by heavy loads and are often used in conjunction with a hammer wrench.

[0003] A jacking screw is a widely used tool in the power industry, primarily used in the disassembly and assembly of steam turbine cylinders. It comes in handy when it's necessary to loosen the mating screws on the steam turbine cylinder. Its main function is to pry open the cylinder mating surfaces to facilitate subsequent lifting and maintenance. The use of jacking screws often requires the use of other tools, such as a hammer wrench. Through the synergistic effect of these tools, work efficiency can be greatly improved, and labor costs reduced.

[0004] Currently, conventional set screws require the use of a hammer wrench. When using the hammer wrench, one person needs to hold it while another strikes, which not only increases the loosening rate but also increases the risk of injury to the worker holding the hammer wrench. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a modified set screw for turbine maintenance, so as to solve the problem that when conventional set screws are used with a hammer wrench, not only is it difficult to position the hammer wrench, but also, when two people are working together, the workers holding the hammer wrench are prone to injury.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a modified top screw for turbine maintenance, comprising a top screw assembly, a connecting assembly at the end of the top screw assembly, and an anti-detachment assembly on the connecting assembly;

[0007] The set screw assembly includes a set screw body;

[0008] The connecting assembly includes a connecting rod;

[0009] The anti-detachment component includes an anti-detachment sheet.

[0010] Furthermore, the set screw body is a cylindrical structure, and a set screw head is provided at one end of the set screw body. The set screw head is a conical structure, and an external thread is provided on the surface of the set screw body. An end head is provided at the end of the set screw body away from the set screw head. The end head is a hexagonal structure, and a gasket is also provided on the surface of the set screw body. The set screw head, end head, set screw body and gasket are all integral structures, and an alignment groove is also provided on the end face of the end head.

[0011] Furthermore, one end of the connecting rod is set on the end cap, and the end of the connecting rod is inserted and connected to the inside of the alignment groove. The connecting rod has a cylindrical structure, and the surface of the connecting rod is provided with grooves, which are symmetrically distributed along the outer ring wall of the connecting rod.

[0012] Furthermore, a locking pin is provided inside the groove, the surface of the locking pin is slidably and tightly attached to the inner wall of the groove, the end of the locking pin has a curved structure, and a spring is provided inside the groove, with the two ends of the spring being fixedly installed to the end face of the locking pin and the inner wall of the groove, respectively.

[0013] Furthermore, an arc-shaped groove is provided inside the alignment groove, and an inner arc surface is provided on the inner wall surface of the arc-shaped groove. The end curved surface of the locking pin is in close contact with the inner arc surface of the arc-shaped groove.

[0014] Furthermore, the outer wall surface of the connecting rod is provided with an external thread, and a limit groove is provided on the surface of the connecting rod.

[0015] Furthermore, the anti-detachment piece is disposed on the surface of the connecting rod, and a through hole is provided in the center of the anti-detachment piece. The inner wall of the through hole is slidably sleeved with the surface of the connecting rod. A limit block is provided on the inner wall of the through hole. The limit block and the anti-detachment piece are an integral structure. The surface of the limit block is slidably disposed with the inside of the limit groove. The limit groove is a strip groove structure.

[0016] Furthermore, a locking sleeve is fitted to one side of the anti-detachment plate. The locking sleeve is mounted on the connecting rod. An internal thread is provided on the inner wall of the locking sleeve. The internal thread and the external thread are threaded together. Several knobs are provided on the outer ring wall of the locking sleeve. The knobs are equidistantly distributed in a ring along the surface of the locking sleeve.

[0017] The working principle and beneficial effects of this solution are as follows: 1. This solution completely changes this situation through the integrated design of the gasket and the quick-installation anti-dislodgement component. The gasket, as the supporting structure of the hammer wrench, can stably bear the striking force, while the combination of the anti-dislodgement plate and the locking sleeve further restricts the displacement of the wrench. During operation, only one person is needed to complete the installation and hammering of the set screw, which reduces the manpower required and avoids the safety accidents that may occur during collaboration.

[0018] 2. As described in 1, the precise fit between the external thread and the screw hole of the component allows the jacking force to be applied gradually through rotation, avoiding the instantaneous impact damage caused by the direct action of traditional hammering on the surface of the equipment. The conical jacking head design allows for smooth insertion into the mating surface, while the progressive lifting of the external thread can precisely control the separation gap, preventing deformation or cracking of the mating surface due to uneven force. The addition of the anti-loosening component further optimizes this process: the hammer wrench ensures that the striking force is always transmitted along the axial direction of the jacking screw through the double limiting of the anti-loosening plate and the washer, avoiding thread seizing or screw hole deformation caused by off-center load.

[0019] 3. As described in section 2, the connecting rod and end adopt a quick-release structure with a snap-fit ​​spring, combined with the guide design of the arc groove, which can realize the installation and disassembly of the anti-detachment component in seconds. Traditional auxiliary positioning devices often require cumbersome bolt fixing, while in this design, the curved end of the snap-fit ​​and the arc groove fit tightly together, which not only ensures the connection strength, but also makes it easy to separate by simply pulling the connecting rod. The threaded engagement of the external thread and the locking sleeve further simplifies the fixing process of the anti-detachment plate, and the operator can quickly lock it by turning the knob.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall disassembly of the embodiment;

[0022] Figure 2 This is a schematic diagram of the overall internal structure of the embodiment;

[0023] Figure 3 This is an enlarged schematic diagram of point A in the embodiment;

[0024] Figure 4 This is a schematic diagram of the bolt head end face structure in an embodiment;

[0025] Figure 5 This is a schematic diagram showing the distribution of the quick-connect pins and limiting plates in an embodiment.

[0026] Figure 6 This is a schematic diagram of the locking sleeve structure in an embodiment.

[0027] The following are labeled in the attached diagram: 1. Set screw assembly; 2. Connecting assembly; 3. Anti-detachment assembly; 10. Set screw body; 11. Set screw head; 12. External thread one; 13. End; 14. Washer; 15. Alignment groove; 20. Connecting rod; 21. Groove; 22. Locking pin; 23. Spring; 24. Arc groove; 2001. External thread two; 2002. Limiting groove; 30. Anti-detachment piece; 31. Limiting block; 32. Locking sleeve; 33. Internal thread; 34. Knob. Detailed Implementation

[0028] The following detailed description illustrates the specific implementation methods:

[0029] Example

[0030] like Figures 1 to 6As shown, a modified top screw for turbine maintenance is disclosed, including a top screw assembly 1, a connecting assembly 2 at the end of the top screw assembly 1, and an anti-detachment assembly 3 on the connecting assembly 2;

[0031] The set screw assembly 1 includes a set screw body 10;

[0032] Connecting component 2 includes connecting rod 20;

[0033] The anti-detachment component 3 includes an anti-detachment sheet 30.

[0034] The set screw body 10 has a cylindrical structure, and a set screw head 11 is provided at one end of the set screw body 10. The set screw head 11 has a conical structure, which facilitates better insertion with the component during use. The surface of the set screw body 10 is provided with an external thread 12, which mates with the threaded hole on the component mating surface. By rotating the set screw, a set force is provided to open the cylinder mating surface. At the same time, it ensures that the set screw remains in a fixed position during use, preventing slippage or displacement, avoiding direct hammering of the equipment surface, and reducing damage to the equipment. By rotating the external thread 12, the set force can be applied gradually, avoiding damage to the equipment due to sudden excessive force. The end of the set screw body 10 away from the set screw head 11 is provided with an end head 13, which has a hexagonal structure, facilitating the connection between the hammer wrench and the end head 13. The surface of 0 is also provided with a washer 14. The set screw head 11, end head 13, set screw body 10 and washer 14 are all integral structures. The washer 14 is formed by leaving one edge unmilled when milling the hexagonal structure of the end head 13 of the set screw. The washer 14 can play a supporting role when the hammer wrench and the end head 13 are mated. The setting of the washer 14 reduces the need for two people to work, one to hammer and one to hold the wrench. Now, only one person needs to operate the hammer wrench by placing it on the set screw, which saves manpower and prevents injury to the worker holding the wrench. The end face of the end head 13 is also provided with a positioning groove 15. The positioning groove 15 is a circular groove structure. The positioning groove 15 is mainly used for assembly with the connecting rod 20 to install the externally added anti-dislodgement component for auxiliary positioning of the hammer wrench.

[0035] One end of the connecting rod 20 is set on the end head 13. The end of the connecting rod 20 is inserted and connected to the inside of the alignment groove 15. The connecting rod 20 is a cylindrical structure. The surface of the connecting rod 20 is provided with a groove 21. The groove 21 is symmetrically distributed along the outer ring wall of the connecting rod 20. The connecting rod 20 can be used for the transition connection of the anti-detachment component.

[0036] The groove 21 is provided with a locking pin 22. The surface of the locking pin 22 is slidably attached to the inner wall of the groove 21. The end of the locking pin 22 is curved. The groove 21 contains a spring 23. The two ends of the spring 23 are fixedly installed to the end face of the locking pin 22 and the inner wall of the groove 21, respectively. The end of the locking pin 22 is designed to be curved so that when the rod 20 is installed with the alignment groove 15, the port of the alignment groove 15 can contact and squeeze the locking pin 22 more smoothly. The spring 23 can compress the locking pin 22 when it is subjected to the squeezing force and can reset when the squeezing force is lost, thereby ensuring the stability of the extension and retraction reset of the locking pin 22.

[0037] An arc-shaped groove 24 is provided inside the alignment groove 15. The inner wall of the arc-shaped groove 24 is provided with an inner arc surface. The end curved surface of the locking pin 22 is in close contact with the inner arc surface of the arc-shaped groove 24. The design of the inner arc surface can better fit and close tightly when the locking pin 22 engages the connecting rod 20 with the alignment groove 15. During disassembly, the design of the arc-shaped groove 24 makes the pressing path of the locking pin 22 arc-shaped. When the connecting rod 20 is separated from the alignment groove 15, the continuous compression along the path allows the locking pin 22 to smoothly compress the spring 23 and enter the interior of the arc-shaped groove 24. The quick installation and removal method of the locking pin 22 ensures that the auxiliary positioning process when using the hammer wrench will not be delayed due to the installation of the connecting rod 20 component on a single set screw. Quick insertion and removal can improve efficiency.

[0038] The outer wall of the connecting rod 20 is provided with an external thread 2001. The external thread 2001 can be used to lock the internal thread 33 inside the locking sleeve 32 of the anti-detachment plate 30 for assembly and installation. The surface of the connecting rod 20 is provided with a limiting groove 2002. The limiting groove 2002 can be used to limit the sliding with the limiting block 31 on the inner wall of the central through hole of the anti-detachment plate 30.

[0039] An anti-detachment plate 30 is disposed on the surface of the connecting rod 20. A through hole is provided in the center of the anti-detachment plate 30. The inner wall of the through hole is slidably sleeved with the surface of the connecting rod 20. A limit block 31 is provided on the inner wall of the through hole. The limit block 31 and the anti-detachment plate 30 are integral structures. The surface of the limit block 31 is slidably disposed with the interior of the limit groove 2002. The limit groove 2002 is a strip groove structure. When the anti-detachment plate 30 and the gasket 14 are engaged and connected with the hammer wrench, they can limit and position the hammer wrench on both sides, making it more stable when the hammer wrench is struck.

[0040] A locking sleeve 32 is fitted to one side of the anti-detachment plate 30. The locking sleeve 32 is mounted on the connecting rod 20. An internal thread 33 is provided on the inner wall of the locking sleeve 32, and the internal thread 33 is threaded to the external thread 2001. Several knobs 34 are provided on the outer ring wall of the locking sleeve 32. One end of each knob 34 is welded to the surface of the locking sleeve 32. The knobs 34 are evenly distributed in a ring along the surface of the locking sleeve 32. After the hammer wrench and end head 13 are in place, they connect to the end head 13 via the connecting rod 20. The quick installation of head 13 allows the anti-detachment plate 30 and connecting rod 20 to be fitted together, and with the help of washer 14, the two sides of the hammer wrench are limited and positioned. Then, by the mutual threading of the internal thread 33 of locking sleeve 32 and the external thread 2001 of connecting rod 20, the locking sleeve 32 can be positioned for the anti-detachment plate 30. This solves the problem that if the set screw is tilted at a certain angle after the hammer wrench is fitted with head 13, the hammer wrench will still be unstable when it is struck.

[0041] In practice

[0042] In this solution, the set screw assembly 1 precisely engages with the screw hole on the cylinder mating surface through the external thread 12 set on the surface of the set screw body 10. When the end head 13 is rotated, the helical motion of the external thread 12 converts the rotational force into a linear lifting force, causing the conical set screw head 11 to gradually insert into the gap between the components. This gradual force application method avoids damage to the equipment mating surface caused by instantaneous impact loads. At the same time, the self-locking characteristic of the external thread 12 ensures that the set screw will not retract or slip during the lifting process. The washer 14 serves as the force-bearing interface between the end head 13 and the hammer wrench. Its integrated design not only disperses the hammering stress but also forms a rigid support through the retained unmilled edge, which greatly improves the stability of the wrench when operated by a single person. The circular structure of the alignment groove 15 provides a precise insertion reference for the connecting rod 20, ensuring the rapid alignment and installation of the subsequent anti-detachment assembly 3.

[0043] The connecting rod 20 is elastically engaged with the arc groove 24 inside the alignment groove 15 through the curved locking pin 22 at its end. When the connecting rod 20 is inserted, the locking pin 22 is compressed by the arc surface inside the arc groove 24 until the curved surface of the locking pin 22 and the arc groove 24 are completely fitted together to achieve self-locking. During disassembly, the reverse pulling force causes the locking pin 22 to slide along the arc path, and the spring 23 is compressed a second time to release. The coordinated design of the external thread 2001 and the limiting groove 2002 allows the anti-detachment piece 30 to slide axially in the limiting groove 2002 through the limiting block 31. At the same time, the external thread 2001 and the internal thread 33 of the locking sleeve 32 cooperate to achieve axial pressing of the anti-detachment piece 30, which ensures the rapid positioning of the anti-detachment piece 30 and eliminates the risk of axial movement during the hammering process through thread locking.

[0044] The sliding fit between the limiting block 31 and the limiting groove 2002 inside the through hole of the anti-detachment plate 30 restricts the circumferential rotation of the anti-detachment plate 30, allowing it to move only along the axial direction of the connecting rod 20. When the hammer wrench is inserted into the end 13, the anti-detachment plate 30 and the washer 14 form a front and rear clamping structure. The locking sleeve 32 is driven by the rotation of the knob 34 to push the internal thread 33 along the external thread 2001, pressing the anti-detachment plate 30 against the back of the hammer wrench. The parallel movement of the anti-detachment plate 30 is maintained by the guiding effect of the limiting block 31 and the limiting groove 2002, avoiding jamming caused by off-center load. The annular distribution of the knob 34 provides multiple angle force application points, ensuring that the locking sleeve 32 can still be tightened efficiently in a narrow space. Finally, a three-point stable structure is formed between the hammer wrench, the washer 14, and the anti-detachment plate 30, completely eliminating the risk of tool detachment under tilted working conditions.

[0045] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. A retrofit top pin for turbine maintenance, characterized by: It includes a set screw assembly, the end of which is provided with a connecting component, and the connecting component is provided with an anti-detachment component; The set screw assembly includes a set screw body; The connecting assembly includes a connecting rod; The anti-detachment component includes an anti-detachment sheet.

2. A retrofit top pin for turbine maintenance according to claim 1, characterized in that: The set screw body is a cylindrical structure, and a set screw head is provided at one end of the set screw body. The set screw head is a conical structure, and an external thread is provided on the surface of the set screw body. An end head is provided at the end of the set screw body away from the set screw head. The end head is a hexagonal structure, and a gasket is also provided on the surface of the set screw body. The set screw head, end head, set screw body and gasket are all integral structures, and an alignment groove is also provided on the end face of the end head.

3. A retrofit top pin for turbine maintenance according to claim 2, characterized in that: One end of the connecting rod is set on the end cap, and the end of the connecting rod is inserted and connected to the inside of the alignment groove. The connecting rod has a cylindrical structure, and the surface of the connecting rod has grooves that are symmetrically distributed along the outer ring wall of the connecting rod.

4. A retrofit top pin for turbine maintenance according to claim 3, characterized in that: The groove is provided with a locking pin inside. The surface of the locking pin is slidably attached to the inner wall of the groove. The end of the locking pin is a curved structure. There is a spring inside the groove. The two ends of the spring are fixedly installed to the end face of the locking pin and the inner wall of the groove, respectively.

5. A retrofit top pin for turbine maintenance according to claim 4, characterized in that: The alignment groove has an arc-shaped groove inside, and the inner wall of the arc-shaped groove has an inner arc surface. The end curved surface of the locking pin is in close contact with the inner arc surface of the arc-shaped groove.

6. A retrofit top pin for turbine maintenance according to claim 5, characterized in that: The outer wall of the connecting rod is provided with an external thread, and the surface of the connecting rod is provided with a limit groove.

7. A modified set screw for turbine maintenance according to claim 6, characterized in that: The anti-detachment plate is disposed on the surface of the connecting rod. A through hole is opened in the center of the anti-detachment plate. The inner wall of the through hole is slidably sleeved with the surface of the connecting rod. A limit block is provided on the inner wall of the through hole. The limit block and the anti-detachment plate are integral structures. The surface of the limit block is slidably disposed with the inside of the limit groove. The limit groove is a strip groove structure.

8. A modified set screw for turbine maintenance according to claim 7, characterized in that: A locking sleeve is fitted to one side of the anti-detachment plate. The locking sleeve is mounted on the connecting rod. The inner wall of the locking sleeve is provided with an internal thread. The internal thread and the external thread are threaded together. Several knobs are provided on the outer ring wall of the locking sleeve. The knobs are equidistantly distributed in a ring along the surface of the locking sleeve.

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