A detachable anti-bite red sleeve ring heating device clamping mechanism and its working method

Abstract

The present application belongs to the field of mechanical assembly of thermal power steam turbine, and discloses a detachable anti-bite red sleeve ring heating device clamping mechanism and a working method thereof, aiming at solving the problem of easy biting and difficult replacement of the existing red sleeve ring heating device clamping mechanism thread. The present application is provided with an outer sleeve, an inner sleeve, an end cover, a pin and a jacking screw on the heating device. After positioning and fixing the outer sleeve and the annular heating tube, the inner sleeve is installed into the outer sleeve, the hook of the end cover is aligned with the boss gap of the outer sleeve, the pin is installed, and finally the jacking screw is installed, completing the assembly of the clamping mechanism. During the use of the clamping mechanism provided by the present application, the thread cooperation of the jacking screw and the threaded sleeve is far away from the heat source, reducing the influence of high temperature on the thread cooperation and reducing the probability of biting. Even if accidental biting occurs, the jacking screw can be quickly removed and replaced, avoiding the scrapping of the heating device and greatly reducing the impact on the production progress.

Description

Technical Field

[0001] This invention belongs to the field of mechanical assembly of thermal power turbines, and specifically relates to a detachable anti-seize red ring heating device clamping mechanism and its working method. Background Technology

[0002] The cylindrical inner cylinder is a common structure in high-parameter thermal power turbines. It uses a red collar instead of a center-split flange and bolts to connect and fix the upper and lower cylinders. The red collar and the inner cylinder have an interference fit. The red collar needs to be heated with a heating device first. After it expands due to heat, it is fitted into the outer circle of the inner cylinder for installation. After cooling, the red collar shrinks, tightening the inner cylinder to complete the assembly.

[0003] like Figure 3 As shown, the clamping mechanism of the old-style red ring heating device consists of a threaded sleeve and a tightening screw. The threaded sleeve is welded to the ring tube of the heating device. During use, the screws of each clamping mechanism press against the annular groove on the outer circumference of the red ring, thus clamping the red ring. However, during the use of the heating device, the threaded mating parts of the tightening screw and the threaded sleeve are very close to the heat source and are easily affected by high temperatures. In addition, the thermal expansion of the red ring will bring great stress to the threaded mating, making it very easy for the tightening screw to seize during the heating process of the red ring. Once multiple screws seize simultaneously, the heating device can only be removed from the red ring by cutting it to scrap. Even if only a single screw seizes, the heating device will become unusable. The clamping mechanism of this structure is difficult to replace, has a long repair cycle, and seriously affects the production schedule. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a detachable, anti-seize-up clamping mechanism for a red ring heating device, thereby solving the problem that the threads of existing red ring heating device clamping mechanisms are prone to seizing and difficult to replace.

[0005] To achieve the objective of this invention, the technical solution adopted is as follows: The present invention provides a detachable anti-seize red ring heating device clamping mechanism, including an outer sleeve 1, an inner threaded sleeve 2, an end cap 3, a pin 4, and a tightening screw 5; The outer sleeve 1 has a keyway machined inside; the outer end face of the outer sleeve 1 has a boss machined on it. The outer end face of the inner threaded sleeve 2 is machined with a key, which mates with the keyway inside the outer sleeve 1 to prevent the inner threaded sleeve 2 from rotating with the set screw 5 during use. The number of keys is the same as the number of keyways. The number of keyways and keys is preferably 2 to 4; further, the number of keyways and keys is preferably 3. The inner threaded sleeve 2 has a metric coarse thread inside, which mates with the tightening screw 5. Preferably, the length of the inner threaded sleeve 2 is 1.5 times the diameter of the internal thread specification, which ensures the tightening force while keeping the threaded engagement section at the furthest distance from the high-temperature fire source. The center of the end cap 3 is machined with a round hole. The diameter of the round hole is larger than the outer diameter of the tightening screw 5 and smaller than the outer diameter of the inner thread sleeve 2. One end of the end cap 3 is machined with a claw, which engages with the boss on the outer end face of the outer sleeve 1. The number of claws is the same as the number of bosses. The number of bosses and claws is 2 to 4; more preferably, the number of bosses and claws is 3. The outer sleeve 1 passes through the outer and inner ring walls of the annular heating tube 6 and is fixed to the annular heating tube 6; preferably, the outer sleeve 1 and the annular heating tube 6 are fixed by welding. The inner threaded sleeve 2 is installed inside the outer sleeve 1; preferably, after assembly, the inner threaded sleeve 2 is located at the middle of the annular heating tube 6 slightly outside, so that when the heating device is in use, the threaded engagement section with the set screw can maintain a distance from the high-temperature fire source.

[0006] End cap 3 is installed on the end face of outer sleeve 1 and presses the inner threaded sleeve 2 tightly; Pin 4 is installed in the pin hole drilled between the outer sleeve 1 and the end cover 3. Pin 4 is used to fix the outer sleeve 1 and the end cover 3 to prevent the end cover 3 from rotating when the heating device is in use. The tightening screw 5 passes through the entire outer sleeve 1, with its first end pressing against the outer wall of the red collar, and its end passing through the round hole of the end cap 3 located on the outside of the end cap 3; preferably, the thread on the tightening screw 5 is 0.2mm~0.3mm smaller than the mean diameter of the standard thread, which increases the thread fit clearance and makes it less likely to seize.

[0007] The working method of the detachable anti-seize red ring heating device clamping mechanism provided by the present invention includes an installation method, a clamping method, and a maintenance method.

[0008] The installation method of the detachable anti-seize red collar heating device clamping mechanism includes the following steps: (1) Pass the outer sleeve through the corresponding mounting hole of the annular heating tube and position it according to the welding position; (2) The outer sleeve is fixed to the annular heating tube, preferably by manual arc welding; (3) Insert the inner thread into the outer sleeve; (4) Align the hooks of the end cap with the gap between the bosses of the outer sleeve, then insert and rotate until the hooks are aligned with the bosses. (5) Install the mounting hole for the drilled pin and insert the pin; (6) Install the tightening screw.

[0009] The clamping method of the detachable anti-seize red collar heating device clamping mechanism provided by the present invention includes the following steps: (1) Before clamping, turn the clamping screws of each clamping mechanism outward so that the inner circle formed by the head of the clamping screw is larger than the outer diameter of the red collar. (2) Place the red ring heating device on the outside of the red ring and tighten the tightening screws at each place so that its head end is pressed against the outer circle of the red ring, thereby realizing the clamping of the red ring; (3) After the red collar is assembled with the cylindrical inner cylinder, turn the top screws 5 of the clamping mechanism outward to disengage the red collar from the clamping state.

[0010] The maintenance method for the detachable anti-seize red collar heating device clamping mechanism provided by the present invention includes the following steps: (1) Use a pin puller to remove the pin; (2) Rotate the end cap so that its claws are aligned with the gap between the bosses on the outer sleeve, and then remove the end cap; (3) Remove the seized locking screw and inner threaded sleeve from the outer sleeve; (4) Insert the new inner thread into the outer sleeve; (5) Align the hooks of the end cap with the gap between the bosses of the outer sleeve, then insert and rotate until the pin holes are aligned. (6) Insert the pin; (7) Install the tightening screw.

[0011] The technical solution provided by this invention has the following beneficial effects: 1. Keep the threaded fit of the tightening screw and the threaded sleeve away from the heat source to reduce the impact of high temperature on the threaded fit and reduce the chance of seizing.

[0012] 2. An innovative design of the threaded sleeve structure allows for quick removal and replacement of the tightening screw even if seizing occurs accidentally, thus avoiding the scrapping of the heating device and greatly reducing the impact on production schedule. Attached Figure Description

[0013] Figure 1 A schematic diagram of the clamping mechanism for a detachable, anti-seize red collar heating device. Figure 2 This is a three-dimensional structural diagram of the outer sleeve, inner threaded sleeve, and end cap. Figure 3 A schematic diagram of the clamping mechanism of the old-style red ring heating device; In the diagram: 1-outer sleeve, 2-inner threaded sleeve, 3-end cap, 4-pin, 5-tightening screw, 6-annular heating tube. Detailed Implementation

[0014] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0015] Example 1 The detachable anti-seize red ring heating device clamping mechanism provided by the present invention includes an outer sleeve 1, an inner threaded sleeve 2, an end cap 3, a pin 4, and a tightening screw 5; The outer sleeve 1 has a keyway machined inside; the outer end face of the outer sleeve 1 has a boss machined on it. The outer end face of the inner threaded sleeve 2 is machined with a key, which mates with the keyway inside the outer sleeve 1 to prevent the inner threaded sleeve 2 from rotating with the set screw 5 during use. The number of keys and keyways is 3. The inner threaded sleeve 2 has a metric coarse thread inside, which mates with the tightening screw 5. The length of the inner threaded sleeve 2 is 55mm, and the internal thread specification is M36. This ensures the tightening force while keeping the threaded engagement section at the furthest distance from the high-temperature fire source. The center of the end cap 3 is machined with a 40mm diameter hole. The diameter of the hole is larger than the outer diameter of the tightening screw 5 and smaller than the outer diameter of the inner thread sleeve 2. One end of the end cap 3 is machined with a claw, which engages with the boss on the outer end face of the outer sleeve 1. The number of claws and the number of bosses are 3. The outer sleeve 1 passes through the outer and inner ring walls of the annular heating tube 6 and is fixed to the annular heating tube 6 by welding. The inner threaded sleeve 2 is installed inside the outer sleeve 1; after assembly, the inner threaded sleeve 2 is located in the middle of the annular heating tube 6, slightly outward, to ensure that the threaded engagement section of the heating device with the set screw can maintain a distance from the high-temperature fire source when the heating device is in use.

[0016] End cap 3 is installed on the end face of outer sleeve 1 and presses the inner threaded sleeve 2 tightly; Pin 4 is installed in the pin hole drilled between the outer sleeve 1 and the end cover 3. Pin 4 is used to fix the outer sleeve 1 and the end cover 3 to prevent the end cover 3 from rotating when the heating device is in use. The tightening screw 5 passes through the entire outer sleeve 1, with its first end pressing against the outer wall of the red collar, and its end passing through the round hole of the end cap 3 located on the outside of the end cap 3; the thread on the tightening screw 5 is 0.2mm~0.3mm smaller than the standard thread pitch diameter, which increases the thread fit clearance and makes it less likely to seize.

[0017] Example 2 The installation method of the detachable anti-seize red collar heating device clamping mechanism provided by the present invention includes the following steps: (1) Pass the outer sleeve 1 through the corresponding mounting hole of the annular heating tube, with the end extending about 10mm beyond the annular heating tube to facilitate welding of fillet welds; (2) The outer sleeve 1 and the annular heating tube are welded and fixed by manual electric arc welding, using welding material J507; (3) Insert the inner threaded sleeve 2 into the outer sleeve 1; (4) Align the claws of the end cap 3 with the gap between the bosses of the outer sleeve 1, then insert and rotate until the claws are aligned with the bosses. (5) Insert the mounting hole for the drilled pin 4; (6) Install the tightening screw 5.

[0018] Example 3 The clamping method of the detachable anti-seize red collar heating device clamping mechanism provided by the present invention includes the following steps: (1) Before clamping, turn the clamping screws 5 of each clamping mechanism outward so that the inner circle formed by the head end of the clamping screw 5 is larger than the outer diameter of the red collar. (2) Place the heating device on the outside of the red ring and tighten the tightening screws 5 at each place so that its head end is pressed against the outer circle of the red ring, thereby realizing the clamping of the red ring; (3) After the red collar is assembled with the cylindrical inner cylinder, turn the top screws 5 of the clamping mechanism outward to disengage the red collar from the clamping state.

[0019] Example 4 The maintenance method for the detachable anti-seize red collar heating device clamping mechanism provided by the present invention includes the following steps: (1) Use a pin puller to remove pin 4; (2) Rotate the end cap 3 so that its claws are aligned with the gap of the boss on the outer sleeve 1, and then remove the end cap 3; (3) Remove the seized tightening screw 5 and inner threaded sleeve 2 from the outer sleeve 1; (4) Insert the new inner threaded sleeve 2 into the outer sleeve 1; (5) Align the claws of the end cap 3 with the gap between the bosses of the outer sleeve 1, then insert and rotate until the pin holes are aligned. (6) Insert pin 4; (7) Install the tightening screw 5.

[0020] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A detachable, anti-seize red collar heating device clamping mechanism, characterized in that: It includes an outer sleeve (1), an inner threaded sleeve (2), an end cap (3), a pin (4), and a tightening screw (5); The outer sleeve (1) has a keyway inside; the outer end face of the outer sleeve (1) has a boss. The outer end face of the inner threaded sleeve (2) is machined with a key, which mates with the keyway inside the outer sleeve (1), and the number of keys is the same as the number of keyways; The inner threaded sleeve (2) is machined with a metric coarse thread, which is engaged with the tightening screw (5); The end cap (3) has a round hole machined in the center. The diameter of the round hole is larger than the outer diameter of the tightening screw (5) and smaller than the outer diameter of the inner thread sleeve (2). One end of the end cap (3) is machined with a claw, which engages with the boss on the outer end face of the outer sleeve (1), and the number of claws is the same as the number of bosses; The outer sleeve (1) passes through the outer and inner ring walls of the annular heating tube (6) and is fixed to the annular heating tube (6); The inner threaded sleeve (2) is installed inside the outer sleeve (1); The end cap (3) is installed on the end face of the outer sleeve (1) and presses the inner threaded sleeve (2). The pin (4) is installed in the pin hole drilled in the outer sleeve (1) and the end cap (3); The tightening screw (5) passes through the entire outer sleeve (1), with its first end pressing against the outer wall of the red collar, and its end passing through the round hole of the end cap (3) located on the outside of the end cap (3).

2. The detachable anti-seize red collar heating device clamping mechanism according to claim 1, characterized in that: The number of keyways and keys is 2 to 4.

3. The detachable anti-seize red collar heating device clamping mechanism according to claim 1, characterized in that: The number of bosses and claws is 2 to 4.

4. The detachable anti-seize red collar heating device clamping mechanism according to claim 1, characterized in that: The outer sleeve and the annular heating tube are fixed together by welding.

5. The detachable anti-seize red collar heating device clamping mechanism according to claim 1, characterized in that: The inner screw assembly is located slightly outside the middle of the annular heating tube after assembly.

6. The detachable anti-seize red collar heating device clamping mechanism according to claim 1, characterized in that: The length of the internal thread sleeve is 1.5 times the diameter of the internal thread specification.

7. The detachable anti-seize red collar heating device clamping mechanism according to claim 1, characterized in that: The thread of the tightening screw is 0.2mm to 0.3mm smaller than the pitch diameter of the standard thread.

8. A method for installing a detachable anti-seize red collar heating device clamping mechanism as described in any one of claims 1-7, characterized in that, Including the following steps: (1) Position the outer sleeve by passing it through the corresponding mounting hole of the annular heating tube; (2) Fix the outer sleeve and the annular heating tube; (3) Insert the inner thread into the outer sleeve; (4) Align the hooks of the end cap with the gap between the bosses of the outer sleeve, then insert and rotate until the hooks are aligned with the bosses. (5) Install the mounting hole for the drilled pin and insert the pin; (6) Install the tightening screw.

9. A clamping method for a detachable anti-seize red collar heating device clamping mechanism as described in any one of claims 1-7, characterized in that, Including the following steps: (1) Before clamping, turn the clamping screws of each clamping mechanism outward so that the inner circle formed by the head of the clamping screw is larger than the outer diameter of the red collar. (2) Place the heating device on the outside of the red ring and tighten the screws at each point so that its head is pressed against the outer circle of the red ring, thereby clamping the red ring. (3) After the red collar is assembled with the cylindrical inner cylinder, turn the tightening screws of each clamping mechanism outward to disengage the red collar from the clamping state.

10. A maintenance method for the detachable anti-seize red collar heating device clamping mechanism as described in any one of claims 1-7, characterized in that, Including the following steps: (1) Use a pin puller to remove the pin; (2) Rotate the end cap so that its claws are aligned with the gap between the bosses on the outer sleeve, and then remove the end cap; (3) Remove the seized locking screw and inner threaded sleeve from the outer sleeve; (4) Insert the new inner thread into the outer sleeve; (5) Align the hooks of the end cap with the gap between the bosses of the outer sleeve, then insert and rotate until the pin holes are aligned. (6) Insert the pin; (7) Install the tightening screw.

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