Coupler limiting device

Abstract

The utility model relates to the technical field of limiters, and discloses a coupler limiting device which comprises a hydraulic servo-motor valve rod, one end of the hydraulic servo-motor valve rod is connected with one end of a valve rod connecting nut through a positioning pin, and the inner side of the other end of the valve rod connecting nut is connected with a valve rod screw thread. A coupler is installed on an outer boss of the hydraulic servo-motor valve rod in a matched mode, and a fixing piece is fixedly connected to the outer side of one end of the coupler. According to the coupler limiting device, by arranging the split clamp, the fixing pieces and the like, the split clamp with four through holes is fixed to a valve rod connecting nut, the four fixing pieces with the through holes are welded to a coupler, the four fixing pieces are connected with the split clamp through bolts, and the split clamp is fixed to the valve rod connecting nut; when the coupler slightly swings under the impact of steam, the fixing piece and the split clamp are connected together, relative displacement of the coupler and the valve rod connecting nut is effectively prevented, and the valve rod cannot be loosened.

Description

Technical Field

[0001] The utility model relates to the technical field of limiters, in particular to a coupling limiter. Background Art

[0002] The coupling currently widely used in the high-pressure regulating valve stem of steam turbines is a device that connects the upper and lower parts through threads and uses anti-rotation screws to stop. When the unit is operating normally, the opening of the high-pressure regulating valve changes with the load demand of the unit.

[0003] Under the long-term impact operation of steam, the coupling of the high-pressure valve is in a slight swinging environment for a long time. With the increase of running time, the anti-rotation screw gradually loosens or breaks under the stress operation, causing the coupling to loosen, thereby causing the oil motor valve stem and the valve stem to loosen, and the high-pressure valve adjustment performance is changed, eventually causing the high-pressure valve stem to fall and close the high-pressure valve. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a coupling limit device, which has the advantages of simple structure, easy operation, greatly improving the anti-loosening performance of the coupling, and effectively preventing the high-adjustment door from falling off. It solves the problem that the coupling is in a slight swinging environment for a long time under the long-term impact operation of steam. As the running time increases, the anti-rotation screws gradually loosen, withdraw or break under the stress operation, causing the coupling to loosen, thereby causing the oil motor valve stem and the valve stem to loosen, and the high-adjustment door adjustment performance is modified, which eventually causes the high-adjustment door stem to fall off and close the high-adjustment door.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coupling limit device, including an oil motor valve stem, one end of the oil motor valve stem is connected to one end of the valve stem connecting nut by a locating pin, the other end of the valve stem connecting nut is threadedly connected to the valve stem of the valve, a coupling is installed at the external boss of the oil motor valve stem, a fixing plate is fixedly connected to the outside of one end of the coupling, a split clamp is installed at the external boss position of the valve stem connecting nut, and the split clamp is fixedly connected to the fixing plate by bolts.

[0006] A first support plate is fixedly installed on the upper surface of the split clamp, a track column is fixedly installed on the side of the first support plate, a second straight rod is fixedly installed on the left end of the track column, an anti-rotation screw is fixedly installed on the outer circumference of the coupling, a first cylindrical rod is fixedly installed on the outer circumference of the anti-rotation screw, a second semi-arc rod is fixedly installed on one end of the first cylindrical rod, a valve stem is inserted in the middle of the valve stem connecting nut, and a first partition is fixedly installed on the outer surface of the coupling.

[0007] Preferably, the valve stem connecting nut is configured as a hexagonal nut structure, and the through holes on the surface of the valve stem connecting nut match the four through holes on the side of the split-type clamp.

[0008] Preferably, a first straight rod is fixedly mounted on the outer circumferential surface of the track column, and a nut protection frame is fixedly mounted on the side surface of the first straight rod.

[0009] Preferably, a first hand lever is slidably mounted on the inner side surface of the second straight rod, the first straight rod is fixedly mounted on one end of the first hand lever, and a first spring is fixedly mounted on the side surface of the first straight rod.

[0010] Preferably, a second partition is slidably mounted on the inner side surface of the first partition, and one end of the second partition is fixedly mounted on the lower surface of the split-type clamp.

[0011] Preferably, a first semi-arc rod is fixedly mounted on one end of the first cylindrical rod, a second cylindrical rod is fixedly mounted on one end of the first semi-arc rod via a straight rod, and a rotating column is rotatably mounted on the outer circumference of the second cylindrical rod.

[0012] Preferably, a rebound column is slidably mounted on one end of the second semi-arc rod via a straight rod, a triangular block is fixedly mounted on one end of the rebound column, and a second spring is fixedly mounted on the side of the triangular block.

[0013] Compared with the prior art, the utility model provides a coupling limit device, which has the following beneficial effects:

[0014] 1. The coupling limit device, by setting a split clamp, a fixing plate, and other components, achieves the effect of fixing the split clamp with 4 through holes on the valve stem connecting nut, welding 4 fixing plates with through holes on the coupling, and connecting the 4 fixing plates with the split clamp by bolts. When the coupling swings slightly under the impact of steam, the fixing plate is connected to the split clamp, which effectively prevents the coupling and the valve stem connecting nut from relative displacement, so that the valve stem will not loosen.

[0015] 2. The coupling limit device, by arranging the first semi-arc rod, the rotating column, the triangular block and other components, achieves the goal of allowing the first semi-arc rod and the second semi-arc rod to rotate through the first cylindrical rod arranged on the anti-rotation screw, without affecting the installation of the square screw, and after the installation, by clamping the coupling and then using the triangular block and the second spring to clamp the rotating column, the first semi-arc rod and the second semi-arc rod are kept stable and not deviated, making the anti-rotation screw more stable and anti-rotating, and solving the problem of the anti-rotation screw gradually loosening, withdrawing or breaking under stress operation, causing the coupling to loosen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure between the first half arc rod and the second half arc rod of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure between the integral rotating column and the triangular block of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the valve stem connecting nut and the anti-rotation screw of the utility model;

[0020] Figure 5 It is a schematic diagram of the cross-sectional structure of the utility model.

[0021] In the figure: 1. coupling; 2. oil motor valve stem; 3. first cylindrical rod; 4. anti-rotation screw; 5. first semi-arc rod; 6. fixing plate; 7. split clamp; 8. valve stem connecting nut; 10. first support plate; 11. first spring; 12. nut protection frame; 13. first straight rod; 14. second straight rod; 15. first hand lever; 16. second semi-arc rod; 18. track column; 19. first partition; 20. second partition; 21. second cylindrical rod; 22. rotating column; 23. triangular block; 24. second spring; 25. rebound column; 26. valve stem. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] The following is combined with Figure 1-Figure 5 This application is described in further detail.

[0024] An embodiment of the present application discloses a coupling limit device, including an oil motor valve stem 2, one end of the oil motor valve stem 2 is connected to one end of a valve stem connecting nut 8 by a locating pin, the valve stem connecting nut 8 is arranged as a hexagonal nut structure, and the through holes on the surface of the valve stem connecting nut 8 match the four through holes on the side of the split clamp 7. When the coupling 1 swings slightly under the impact of steam, the fixing plate 6 is connected to the split clamp 7, which can effectively prevent the coupling 1 and the valve stem connecting nut 8 from relative displacement, so that the valve stem will not loosen.

[0025] The inner side of the other end of the valve stem connecting nut 8 is threadedly connected to the valve stem 26, and a coupling 1 is installed at the external boss of the oil motor valve stem 2. A fixing plate 6 is fixedly connected to the outer side of one end of the coupling 1. A split clamp 7 is installed at the external boss position of the valve stem connecting nut 8, and the split clamp 7 is fixedly connected to the fixing plate 6 by bolts.

[0026] A first support plate 10 is fixedly installed on the upper surface of the split clamp 7, a track column 18 is fixedly installed on the side of the first support plate 10, a first straight rod 13 is fixedly installed on the outer circumferential surface of the track column 18, a nut protection frame 12 is fixedly installed on the side of the first straight rod 13, and the lower half of the valve stem connecting nut 8 is a boss structure, so that the split clamp 7 can be placed more stably and fixedly installed, and the split clamp 7 can protect the boss part of the valve stem connecting nut 8.

[0027] A second straight rod 14 is fixedly installed on one end of the left side of the track column 18, and a first hand rod 15 is slidably installed on the inner side of the second straight rod 14. A first straight rod 13 is fixedly installed on one end of the first hand rod 15, and a first spring 11 is fixedly installed on the side of the first straight rod 13. The first spring 11 can be used to pull the first hand rod 15 and then move the nut protection frame 12 when fixing the fixing plate 6 and the split clamp 7. After the installation is completed, release the first hand rod 15 and the nut protection frame 12 can return to its original position.

[0028] An anti-rotation screw 4 is fixedly installed on the outer circumference of the coupling 1, and a first cylindrical rod 3 is fixedly installed on the outer circumference of the anti-rotation screw 4, a first semi-arc rod 5 is fixedly installed on one end of the first cylindrical rod 3, a second cylindrical rod 21 is fixedly installed on one end of the first semi-arc rod 5 through a straight rod, and a rotating column 22 is rotatably installed on the outer circumference of the second cylindrical rod 21. The outer circumference of the coupling 1 is clamped by two semi-arc rods, so that the anti-rotation screw 4 is more stable and will not rotate due to the jitter of the machine operation, causing the coupling 1 to loosen.

[0029] A second semi-arc rod 16 is fixedly installed on one end of the first cylindrical rod 3, and a rebound column 25 is slidably installed on one end of the second semi-arc rod 16 through a straight rod. A triangular block 23 is fixedly installed on one end of the rebound column 25, and a second spring 24 is fixedly installed on the side of the triangular block 23. The second spring 24 allows the triangular block 23 to rebound and retract. When the rotating column 22 presses down the triangular block 23, the second spring 24 can be compressed, and then the triangular block 23 is used to clamp the rotating column 22. A valve stem 26 is inserted in the middle of the valve stem connecting nut 8. A first partition 19 is fixedly installed on the outer surface of the coupling 1, and a second partition 20 is slidably installed on the inner surface of the first partition 19. One end of the second partition 20 is fixedly installed on the lower surface of the split clamp 7. The two partitions make it easier to align the holes of the fixed plate 6 and the split clamp 7, and it is not easy to offset during fixed installation.

[0030] Working principle: When in use, the oil motor valve stem 2 is installed with the coupling 1 through the boss, and then the valve stem connecting nut 8 is installed with the recessed part of the oil motor valve stem 2 through the boss, and then the split clamp 7 is aligned with the nut part of the valve stem connecting nut 8 for installation, and then clamped by the first partition 19 and the second partition 20 to keep it stable, and then the anti-rotation screw 4 is installed on the side of the coupling 1, and then the coupling 1 is clamped by the first semi-arc rod 5 and the second semi-arc rod 16, and then the triangular block 23 is pressed down by rotating the rotating column 22, and the rotating column 22 is clamped by the spring reset, and the first hand rod 15 is pulled to drive the first straight rod 13 to move and leak out of the hole, and the split clamp 7 and the fixing plate 6 are fixed with screws to keep the valve stem connecting nut 8 fixed with the coupling 1, and then the first straight rod 13 is reset by the first spring 11, and the nut protection frame 12 is used to protect the nut to prevent contact with water, causing rust and affecting the overall stability.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coupling limit device, comprising a hydraulic motor valve stem (2), characterized in that: One end of the oil motor valve stem (2) is connected to one end of the valve stem connecting nut (8) via a positioning pin, the other end of the valve stem connecting nut (8) is threadedly connected to the valve stem (26) on the inner side, a coupling (1) is mounted on the outer boss of the oil motor valve stem (2), a fixing plate (6) is fixedly connected to the outer side of one end of the coupling (1), a split clamp (7) is mounted on the outer boss of the valve stem connecting nut (8), and the split clamp (7) is fixedly connected to the fixing plate (6) via bolts; A first support plate (10) is fixedly mounted on the upper surface of the split clamp (7), a track column (18) is fixedly mounted on the side of the first support plate (10), a second straight rod (14) is fixedly mounted on the left end of the track column (18), an anti-rotation screw (4) is fixedly mounted on the outer circumference of the coupling (1), a first cylindrical rod (3) is fixedly mounted on the outer circumference of the anti-rotation screw (4), a second semi-arc rod (16) is fixedly mounted on one end of the first cylindrical rod (3), a valve stem (26) is inserted in the middle of the valve stem connecting nut (8), and a first partition plate (19) is fixedly mounted on the outer surface of the coupling (1).

2. A coupling limiting device according to claim 1, characterized in that: The valve stem connecting nut (8) is configured as a hexagonal nut structure, and the through holes on the surface of the valve stem connecting nut (8) match the four through holes on the side of the split clamp (7).

3. A coupling limiting device according to claim 1, characterized in that: A first straight rod (13) is fixedly mounted on the outer circumferential surface of the track column (18), and a nut protection frame (12) is fixedly mounted on the side surface of the first straight rod (13).

4. A coupling limiting device according to claim 1, characterized in that: A first hand lever (15) is slidably mounted on the inner side of the second straight rod (14), a first straight rod (13) is fixedly mounted on one end of the first hand lever (15), and a first spring (11) is fixedly mounted on the side of the first straight rod (13).

5. A coupling limiting device according to claim 1, characterized in that: A second partition (20) is slidably mounted on the inner side surface of the first partition (19), and one end of the second partition (20) is fixedly mounted on the lower surface of the split-type clamp (7).

6. A coupling limiting device according to claim 1, characterized in that: A first semi-arc rod (5) is fixedly mounted on one end of the first cylindrical rod (3), a second cylindrical rod (21) is fixedly mounted on one end of the first semi-arc rod (5) via a straight rod, and a rotating column (22) is rotatably mounted on the outer circumferential surface of the second cylindrical rod (21).

7. A coupling limiting device according to claim 1, characterized in that: A rebound column (25) is slidably mounted on one end of the second semi-arc rod (16) via a straight rod, a triangular block (23) is fixedly mounted on one end of the rebound column (25), and a second spring (24) is fixedly mounted on the side of the triangular block (23).

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