Adjustable screwdriver head for steam turbine rotor

Abstract

The utility model discloses an adjustable screwdriver head for a steam turbine rotor. The adjustable screwdriver head comprises an adjusting assembly, a left control assembly and a right control assembly. The adjusting assembly comprises a nut body, an adjusting rod located on the nut body and a bevel gear located at the end of the adjusting rod, and a T-shaped containing groove is formed in the nut body. The left bearing seat and the right bearing seat are spliced to form a containing cavity for containing bevel gears, and the left bevel gear and the right bevel gear are meshed with the bevel gears; the left sliding block sleeve and the right sliding block sleeve are both arranged in the T-shaped containing groove in a sliding fit mode, screwdriver heads are arranged on the left sliding block sleeve and the right sliding block sleeve, and the two screwdriver heads can be driven to move inwards or outwards at the same time through rotation of the adjusting rod so as to adapt to steam turbine rotors of different sizes and specifications.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to an adjustable screwdriver head for a steam turbine rotor. Background Art

[0002] The steam turbine rotor is the core of the steam turbine flow part, which converts the heat energy of steam into mechanical energy to drive the steam turbine rotor to rotate. The steam turbine rotor is equipped with an emergency trip device, which is a mechanical overspeed protection device for the rotor. When the steam turbine rotor runs at an overspeed, the unit can be safely shut down. Therefore, the installation of the emergency trip device plays a vital role in the safe and stable operation of the steam turbine.

[0003] When assembling the rotor emergency circuit breaker, a special compression nut is required. The compression nut is installed in the rotor and fits perfectly with the guide ring. The compression nut is tightened after the fly hammer compression spring is used. When assembling the rotor emergency circuit breaker, pre-assembly is required. The compression nut is screwed in and out several times (such as Figure 1 ). Among them, the limit bolt 19, the clamping nut 20, the guide piece 21, the guide ring 22, the spring 23, the fly hammer 24, the guide sleeve 25, the counterweight pin 26, and the guide piece 27.

[0004] In the prior art, there are only two tooling holes on the compression nut, and the surfaces of the two holes are arc-shaped when viewed from the side. Due to the different models of steam turbine rotors, the types and specifications of the compression nuts are different, resulting in different hole spacings and sizes of the two tooling holes on the compression nut. Different compression nuts require tightening screwdriver heads with different hole spacings. The plug distance of the existing screwdriver head is fixed, and each assembly requires finding a different screwdriver head, which is troublesome and time-consuming. (Existing screwdriver heads such as Figure 2 (As shown) In order to ensure the smooth assembly of the emergency circuit breaker and avoid hitting the rotor body and other parts when screwing in the clamping nut, it is urgent to develop a universal screwdriver head that can improve the assembly efficiency of the turbine rotor emergency circuit breaker. Utility Model Content

[0005] To solve the above technical problems, the utility model provides an adjustable screwdriver head for a steam turbine rotor, which can drive two screwdriver bits to move inward or outward at the same time by rotating an adjusting rod to adapt to steam turbine rotors of different sizes.

[0006] The utility model adopts the following technical solutions:

[0007] An adjustable screwdriver head for a steam turbine rotor comprises an adjusting component, a left control component and a right control component; the adjusting component comprises a nut body, an adjusting rod located on the nut body and a bevel gear located at the end of the adjusting rod, and the nut body is provided with a T-shaped receiving groove; the left control component comprises a left screw, a left slider sleeve threadedly matched with the left screw, a left bearing seat tightly matched with the left screw and a left bevel gear located at the end of the left screw; the right control component comprises a right screw, a right slider sleeve threadedly matched with the right screw, a right bearing seat tightly matched with the right screw and a right bevel gear located at the end of the right screw; the left bearing seat and the right bearing seat are assembled to form an accommodating cavity for accommodating the bevel gear, and the left bevel gear and the right bevel gear are meshed with the bevel gear; the left slider sleeve and the right slider sleeve are both slidably matched in the T-shaped receiving groove, and a screwdriver bit is provided on the left slider sleeve and the right slider sleeve.

[0008] Preferably, the lower end of the left bearing seat is a U-shaped structure, and the lower end of the right bearing seat is a rectangular block.

[0009] Preferably, a left stopper is sleeved on the left screw rod to prevent the left slider sleeve from falling out.

[0010] Preferably, the shaft neck of the left screw is tightly matched with the inner hole of the left bearing seat, and the left bearing seat is fixed to the nut body through the T-shaped receiving groove by a hexagon socket screw.

[0011] Preferably, a right stopper is sleeved on the right screw rod to prevent the right slider sleeve from falling out.

[0012] Preferably, the shaft neck of the right screw is tightly matched with the inner hole of the right bearing seat, and the right bearing seat is fixed to the nut body through the T-shaped receiving groove by a hexagon socket screw.

[0013] Preferably, a hexagonal protrusion is provided on the top of the nut body, and a cylindrical hole connected to the T-shaped receiving groove is provided in the middle of the hexagonal protrusion.

[0014] Preferably, the rear end of the shaft head of the adjusting rod is provided with a first shaft section and a second shaft section with a larger diameter and a smaller diameter, the first shaft section is provided with a bevel gear, and the adjusting rod is inserted into the T-shaped receiving groove through the cylindrical hole.

[0015] Preferably, the second shaft segment is located in the accommodating cavity and the diameter of the first shaft segment is greater than the width of the accommodating cavity.

[0016] Preferably, a scale is provided on the lower end surface of the nut body.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. The utility model provides an adjustable screwdriver head for a steam turbine rotor, comprising an adjusting assembly, a left control assembly and a right control assembly. When in use, the adjusting rod is rotated clockwise with an inner hexagonal wrench, and the left and right screws are driven to rotate clockwise together through the engagement of three bevel gears, so that the slider sleeve and the screwdriver head move inward together. The adjusting rod is rotated counterclockwise to move the slider sleeve and the screwdriver head outward together, so as to adapt to steam turbine rotors of different sizes.

[0019] 2. There are hexagonal grooves at the bottom of the left and right slider sleeves, and they are treated with strong magnetism. The left and right screwdriver bits are respectively inserted into the two hexagonal grooves and are tightly sucked to prevent them from falling.

[0020] 3. A left stopper is provided on the left screw rod to prevent the left slider sleeve from coming out, and a right stopper is provided on the right screw rod to prevent the right slider sleeve from coming out, so as to prevent the left slider sleeve and the right slider sleeve from moving too far.

[0021] 4. There is a scale on the lower end of the nut body. By observing the scale line, the two slider sleeves can be accurately adjusted to the required position. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the emergency circuit breaker assembly;

[0023] Figure 2 It is a schematic diagram of a screwdriver head in the prior art;

[0024] Figure 3 is a three-dimensional schematic diagram of an adjustable screwdriver head;

[0025] Figure 4 is a three-dimensional schematic diagram of an adjustable screwdriver head from another perspective;

[0026] Figure 5 is a bottom view of the adjustable screwdriver head;

[0027] Figure 6 is an exploded view of an adjustable screwdriver head.

[0028] In the figure, nut body 1, T-shaped accommodating groove 1-1, hexagonal protrusion 1-2, adjusting rod 2, first shaft section 2-1, second shaft section 2-2, bevel gear 3, left screw 4, left stopper 5, left slider sleeve 6, left bearing seat 7, left bevel gear 8, right screw 9, right stopper 10, right slider sleeve 11, right bearing seat 12, right bevel gear 13, screw bit 14, gasket 15, hexagon socket screw 16, cylindrical head screw 17, and accommodating cavity 18. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the technical solution of the utility model, a detailed description is given below in conjunction with the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] like Figure 1 As shown, it is a schematic diagram of the structure of a conventional emergency circuit breaker, in which a clamping nut is provided at the top, and the clamping nut has two tooling holes for accommodating screw bits; since the clamping nuts of different steam turbine rotors are different, the distance between the two tooling holes is naturally different.

[0032] like Figure 3-Figure 6 As shown, an adjustable screwdriver head for a steam turbine rotor comprises an adjustment component, a left control component and a right control component;

[0033] The adjusting assembly comprises a nut body 1, an adjusting rod 2 located on the nut body 1, and a bevel gear 3 located at the end of the adjusting rod 2. The nut body 1 is provided with a T-shaped receiving groove 1-1;

[0034] Among them, the nut body 1 has a hexagonal protrusion 1-2 on the top, which is used to be driven by the wrench to rotate as a whole. The middle of the hexagonal protrusion 1-2 has a cylindrical hole connected to the T-shaped receiving groove 1-1, and the adjusting rod 2 has a hexagonal hole at the upper end. The rear end of the shaft head of the adjusting rod 2 is provided with a first shaft section 2-1 and a second shaft section 2-2 with a larger diameter and a smaller diameter, that is, the diameter of the first shaft section 2-1 is larger than the diameter of the second shaft section 2-2, and the first shaft section 2-1 is provided with a bevel gear 3, and the adjusting rod 2 is inserted into the T-shaped receiving groove 1-1 through the cylindrical hole.

[0035] The left control assembly includes a left screw 4, a left slider sleeve 6 threadedly fitted on the left screw 4, a left bearing seat 7 tightly fitted with the left screw 4, and a left bevel gear 8 located at the end of the left screw 4;

[0036] The left screw rod 4 is sleeved with a left stopper 5 to prevent the left slider sleeve 6 from coming out. The left stopper 5 is sleeved on the optical axis of the left screw rod 4. The journal of the left screw rod 4 is tightly matched with the inner hole of the left bearing seat 7. The left bearing seat 7 is fixed to the nut body 1 through the T-shaped receiving groove 1-1 by the hexagon socket screw 16, and the left bearing seat 7 is fixedly installed, so that the left screw rod 4 will not move left and right, but can only rotate. The left stopper 5 is installed outside the cylinder below the nut body 1 and is fixed to the nut body 1 by two washers 15 and two cylindrical head screws 17.

[0037] The right control assembly includes a right screw 9, a right slider sleeve 11 threadedly fitted on the right screw 9, a right bearing seat 12 tightly fitted with the right screw 9, and a right bevel gear 13 located at the end of the right screw 9;

[0038] Among them, the right screw 9 is sleeved with a right stopper 10 to prevent the right slider sleeve 11 from coming out. The right stopper 10 is sleeved on the optical axis position of the right screw 9. The shaft neck of the right screw 9 is tightly matched with the inner hole of the right bearing seat 12. The right bearing seat 12 is fixed to the nut body 1 through the T-shaped receiving groove 1-1 by the hexagon socket screw 16. The right bearing seat 12 is fixedly installed, so that the right screw 9 will not move left and right, but can only rotate. The right stopper 10 is installed outside the cylinder below the nut body 1 and is fixed to the nut body 1 by two washers 15 and two cylindrical head screws 17.

[0039] like Figure 5-Figure 6 As shown, the lower end of the left bearing seat 7 is a U-shaped structure, and the lower end of the right bearing seat 12 is a rectangular block. The left bearing seat 7 and the right bearing seat 12 are assembled to form an accommodating cavity 18 for accommodating the bevel gear 3. The left bevel gear 8 and the right bevel gear 13 are meshed with the bevel gear 3, and the left bevel gear 8 and the right bevel gear 13 are respectively located on the left and right sides of the bevel gear 3; the rear end of the shaft head of the adjusting rod 2 is provided with a first shaft section 2-1 and a second shaft section 2-2 with a larger and smaller diameter, and the bevel gear 3 is provided on the first shaft section 2-1. The adjusting rod 2 is inserted into the T-shaped accommodating groove 1-1 through the cylindrical hole, and the second shaft section 2-2 is located in the accommodating cavity 18 and the diameter of the first shaft section 2-1 is greater than the width of the accommodating cavity 18, which can realize the limiting of the adjusting rod 2 and prevent the adjusting rod 2 from axial movement.

[0040] like Figure 3 As shown, the left slider sleeve 6 and the right slider sleeve 11 are both slidably matched in the T-shaped receiving groove 1-1 and the left slider sleeve 6 and the right slider sleeve 11 are provided with a screwdriver bit 14. The left slider sleeve 6 and the right slider sleeve 11 are provided with an inner hexagonal groove and are subjected to strong magnetic treatment. The left and right screwdriver bits 14 are respectively inserted into the inner hexagonal grooves of the left slider sleeve 6 and the right slider sleeve 11 and are tightly sucked to prevent falling.

[0041] In this embodiment, the left screw 4 and the right screw 9 are explained by taking right-handed screws as an example. When in use, the adjusting rod 2 is rotated clockwise with an hexagonal wrench to drive the left screw 4 and the right screw 9 to rotate together, so that the left slider sleeve 6, the right slider sleeve 11 and the screw bit 14 move inward together. The adjusting rod 2 is rotated counterclockwise to realize the left slider sleeve 6, the right slider sleeve 11 and the screw bit 14 move outward together.

[0042] In addition, if Figure 5 As shown, the lower end surface of the nut body 1 is provided with a scale, and the left slider sleeve 6 and the right slider sleeve 11 can be accurately adjusted to the required position by observing the scale line.

[0043] During assembly, place the turbine rotor horizontally on the workstation, then put the clamping nut into the rotor screw hole, observe the tooling hole spacing on the clamping nut drawing, use the hexagonal wrench to adjust the bit 14 to the required scale position, insert the bit 14 into the tooling hole of the clamping nut, and use the wrench to rotate the hexagonal protrusions 1-2 on the nut body 1 clockwise to tighten the clamping nut to the appropriate position.

[0044] The above are only preferred embodiments of the present invention. The protection scope of the present invention shall be based on the scope defined by the claims. Several improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall also be regarded as the protection scope of the present invention.

Claims

1. An adjustable screwdriver head for a steam turbine rotor, characterized in that: It includes an adjustment component, a left control component and a right control component; The adjustment component comprises a nut body (1), an adjustment rod (2) located on the nut body (1), and a bevel gear (3) located at the end of the adjustment rod (2); the nut body (1) is provided with a T-shaped receiving groove (1-1); The left control assembly comprises a left screw (4), a left slider sleeve (6) threadedly fitted on the left screw (4), a left bearing seat (7) tightly fitted with the left screw (4), and a left bevel gear (8) located at the end of the left screw (4); The right control assembly comprises a right screw (9), a right slider sleeve (11) threadedly fitted on the right screw (9), a right bearing seat (12) tightly fitted with the right screw (9), and a right bevel gear (13) located at the end of the right screw (9); The left bearing seat (7) and the right bearing seat (12) are assembled to form a receiving cavity (18) for receiving the bevel gear (3); the left bevel gear (8) and the right bevel gear (13) are meshed with the bevel gear (3); The left slider sleeve (6) and the right slider sleeve (11) are both slidably fitted in the T-shaped receiving groove (1-1), and a screwdriver bit (14) is provided on the left slider sleeve (6) and the right slider sleeve (11).

2. The adjustable screwdriver head for a steam turbine rotor according to claim 1, characterized in that: The lower end of the left bearing seat (7) is a U-shaped structure, and the lower end of the right bearing seat (12) is a rectangular block.

3. The adjustable screwdriver head for a steam turbine rotor according to claim 1, characterized in that: The left screw rod (4) is sleeved with a left stopper (5) for preventing the left slider sleeve (6) from falling out.

4. The adjustable screwdriver head for a steam turbine rotor according to claim 1, characterized in that: The journal of the left screw rod (4) is tightly matched with the inner hole of the left bearing seat (7), and the left bearing seat (7) is fixed to the nut body (1) through the T-shaped receiving groove (1-1) by means of a hexagon socket screw (16).

5. The adjustable screwdriver head for a steam turbine rotor according to claim 1, characterized in that: The right screw rod (9) is sleeved with a right stopper (10) for preventing the right slider sleeve (11) from falling out.

6. The adjustable screwdriver head for a steam turbine rotor according to claim 1, characterized in that: The journal of the right screw rod (9) is tightly matched with the inner hole of the right bearing seat (12), and the right bearing seat (12) is fixed to the nut body (1) through the T-shaped receiving groove (1-1) by means of a hexagon socket screw (16).

7. The adjustable screwdriver head for a steam turbine rotor according to claim 1, characterized in that: A hexagonal protrusion (1-2) is provided on the top of the nut body (1), and a cylindrical hole communicating with the T-shaped receiving groove (1-1) is provided in the middle of the hexagonal protrusion (1-2).

8. The adjustable screwdriver head for a steam turbine rotor according to claim 7, characterized in that: A first shaft section (2-1) and a second shaft section (2-2) having a larger diameter and a smaller diameter are provided at the rear end of the shaft head of the adjusting rod (2); a bevel gear (3) is provided on the first shaft section (2-1); and the adjusting rod (2) is inserted into the T-shaped receiving groove (1-1) through a cylindrical hole.

9. The adjustable screwdriver head for a steam turbine rotor according to claim 8, characterized in that: The second shaft section (2-2) is located in the accommodating cavity (18) and the diameter of the first shaft section (2-1) is greater than the width of the accommodating cavity (18).

10. The adjustable screwdriver head for a steam turbine rotor according to claim 1, characterized in that: The lower end surface of the nut body (1) is provided with a scale.

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