CN209903116U - Guide device for mounting large-sized nut - Google Patents

Abstract

The utility model provides a guide device for installing a large nut, which belongs to the technical field of machinery. It solves the technical problem of inconvenient installation of large nuts on existing large equipment. It includes a circular guide sleeve, one end face of the guide sleeve is integrally connected with a circular arc convex block, the inner side wall of the circular arc convex block is flush with the inner wall of the center hole of the guide sleeve, and the arc of the circular arc convex block is equal to Or less than 180 degrees, the inner wall of the center hole of the guide sleeve is provided with an inner thread and the inner thread of the center hole of the guide sleeve continues to the inner side wall of the arc bump, and there are several installation holes arranged axially through the guide sleeve, and each installation hole is along the Circumferentially distributed and part of the mounting holes pass through the arc bump. It has the advantages of wide applicability and improved convenience when installing large nuts.

Description

A guide for installing large nuts

technical field

The utility model belongs to the technical field of machinery, and relates to a guide device, in particular to a guide device for installing a large nut.

Background technique

Nuts are commonly used parts that are screwed together with bolts or screws for fastening, and can be seen everywhere in various devices or equipment. For equipment such as CNC machine tools, the size of the nut used is generally relatively small, and the installation can be achieved only by manually operating the wrench. For equipment such as steam turbines commonly found in existing power plants, the equipment itself is very large, so the size of the nut used is several times or dozens of times that of the conventional nut, and the position where the nut is to be installed may be very high. position, the nut in this case is not manually installed and fixed.

For the installation of large nuts, a crane is generally used to hoist the large nuts to the required installation height, and then several workers use tools to cooperate to complete the installation. However, not all large nuts are fixed outside the equipment, some large nuts need to be installed in the corresponding holes on the equipment, and the installation angle of large nuts cannot be well controlled by using a crane, and the angle of large nuts is often not correct. In the case of inability to install, at this time, the angle of the large nut can only be adjusted continuously by manpower and the hoist, but this method is very troublesome, time-consuming and labor-intensive.

SUMMARY OF THE INVENTION

The purpose of the utility model is to solve the above problems existing in the prior art, and propose a guide device for installing a large nut, which solves the technical problem of inconvenient installation of the large nut on the existing large equipment.

The purpose of this utility model can be realized by following technical scheme:

A guide device for installing a large nut, comprising a ring-shaped guide sleeve, characterized in that one end face of the guide sleeve is integrally connected with a circular arc convex block, and the inner side wall of the circular arc convex block is connected to the guide sleeve. The inner wall of the center hole of the guide sleeve is flush with the inner wall, the arc of the arc bump is equal to or less than 180 degrees, the inner wall of the center hole of the guide sleeve is provided with an inner thread, and the inner thread of the center hole of the guide sleeve continues to the inner side wall of the arc bulge. The sleeve is provided with a plurality of installation holes along the axial direction, each installation hole is distributed along the circumferential direction, and some of the installation holes penetrate through the arc projection.

First, a large circular ring structure with a central hole as a threaded hole is machined. The size of the central hole of the large circular ring structure is the same as that of the threaded hole on the steam turbine, and then a number of installations uniformly distributed in the circumferential direction are arranged through the large circular ring structure in the axial direction. Finally, cut a circular arc gap with an arc equal to or less than 180 degrees on the large circular ring structure, so that the remaining structure forms a circular guide sleeve and an arc convex integrally connected to one end face of the guide sleeve. piece.

Before installing the large nut, use a hoist to hoist the guide sleeve to the position corresponding to the threaded hole port on the steam turbine. During the hoisting process, make sure that the inner side wall of the arc bump faces upwards, and then pass the guide sleeve through the installation hole and tighten it. The fitting of the firmware is fixed on the surface of the threaded hole port on the steam turbine, and the inner thread on the central hole of the guide sleeve after the guide device is fixed on the steam turbine is matched with the threaded hole on the steam turbine and forms a continuous inner thread. After the guide device is installed, since the arc of the arc bump is equal to or less than 180 degrees, it means that the large nut can be placed directly from the top of the arc bump into the arc bump by using a crane. The internal thread on the upper part continues to the inner side wall of the arc bump, so after the large nut is placed inside the arc bump, it will naturally form a threaded connection with the correct angle between the arc bump, and then only need to use a tool to turn the large nut. The nut can make the large nut screw into the threaded hole on the steam turbine from the guide sleeve.

By setting the inner thread on the inner wall of the center hole of the guide sleeve, after the guide device is fixed on the steam turbine, it is equivalent to extending the threaded hole on the steam turbine to the outside of the steam turbine. It is matched with the threaded hole on the steam turbine, thereby improving the convenience of installing large nuts on the steam turbine. In addition, the applicability of the guide device is also relatively wide, and it can be used when large-scale equipment needs to be installed with large-scale nuts.

In the above-mentioned guide device, the other end surface of the guide sleeve is fixed with an annular protrusion, the outer diameter of the annular protrusion is smaller than the outer diameter of the guide sleeve, and the center hole of the annular protrusion is in direct communication with the center hole of the guide sleeve, And the inner thread of the inner wall of the central hole of the guide sleeve continues to the inner wall of the annularly protruding central hole.

An annular protrusion is fixed on the other end of the guide sleeve, the outer diameter of the annular protrusion is smaller than the outer diameter of the guide sleeve, and the inner thread of the inner wall of the center hole of the guide sleeve continues to the inner wall of the annular protrusion. The annular protrusion is embedded into the threaded hole port on the steam turbine to position the guide sleeve, ensuring that the center hole of the guide sleeve and the threaded hole on the steam turbine form a coaxial line, and the inner thread of the annular protrusion on the inner wall of the center hole can be aligned with the steam turbine. The threaded holes on the upper part are formed continuously, so as to ensure that the large nut can be guided into the threaded hole on the steam turbine more smoothly through the inner thread in the guide sleeve, which further ensures the convenience and accuracy of the installation of the large nut.

In the above-mentioned guide device, the outer side of the annular protrusion has an annular shoulder.

An annular abutting surface is correspondingly arranged in the threaded hole port on the steam turbine. When the annular protrusion is embedded in the threaded hole port on the steam turbine, the annular retaining shoulder abuts on the annular abutting surface, and the annular retaining shoulder abuts against the annular abutting surface. The matching of the resting surface can guide the embedding of the annular protrusion, so as to make up for the inclination of the annular protrusion due to the incorrect lifting angle.

In the above-mentioned guide device, the first hoisting hole is provided on both end surfaces of the circular arc projection, and the second hoisting hole is provided on the side of the guide sleeve. The opening direction of the first and second hoisting holes is the same, and the second hoisting hole is located in the between the two hoisting holes.

Connect the hoisting screws at the first and second hoisting holes of the two hoisting holes, and then use the hoist to hoist the entire guide sleeve through the cooperation of the wire rope and each hoisting screw. Due to the arrangement of the arc bump, the weight of the entire guide sleeve is concentrated at the arc bump, so two hoisting holes are set at the arc bump, and one is set on the guide sleeve at the two hoisting holes. There are two hoisting holes between the first and second, so that the guide sleeve can be kept horizontal when it is hoisted, and the inner thread on the guide sleeve can be accurately matched with the threaded hole on the steam turbine to form a continuous thread structure, so as to ensure that the large nut can be Fast installation is achieved by this guide.

In the above-mentioned guide device for installing a large nut, the guide device further comprises an annular washer.

In order to ensure the continuity of the thread, when the distance between the end face of the inner thread on the guide sleeve and the end face of the threaded hole on the steam turbine does not meet a pitch, an annular washer can be used to set the space between the two to increase the thickness so that the guide sleeve is on the The distance between the end face of the internal thread and the end face of the threaded hole on the steam turbine satisfies a pitch.

Compared with the prior art, the guide device for installing large nuts is provided with an internal thread that extends from the inner wall of the arc convex block to the inner wall of the annular protrusion. The threaded hole extends to the outside of the steam turbine, and through the arrangement of the arc bumps, the large nut can quickly and accurately form a match with the threaded hole on the steam turbine, which greatly improves the convenience of installing the large nut on the steam turbine. sex.

In addition, the applicability of the guide device is also relatively wide, and it can be used when large-scale equipment needs to be installed with large-scale nuts.

Description of drawings

FIG. 1 is a schematic diagram of a guide device for installing a large nut in the first embodiment.

FIG. 2 is another perspective view of the guide device used for installing the large nut in the first embodiment.

Fig. 3 is a cross-sectional view of the guide device after being fixed to the large equipment.

In the figure, 1, guide sleeve; 1a, two hoisting holes; 2, arc bump; 2a, one hoisting hole; 3, mounting hole; 4, annular protrusion; 4a, annular shoulder.

Detailed ways

The following are specific embodiments of the present utility model combined with the accompanying drawings to further describe the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.

Example 1

As shown in FIG. 1, a guide device for installing large nuts includes a circular guide sleeve 1, one end surface of the guide sleeve 1 is integrally connected with an arc bump 2, and the inner side of the arc bump 2 is integrally connected. The wall is flush with the inner wall of the central hole of the guide sleeve 1 , the outer side wall of the arc projection 2 is flush with part of the outer side wall of the guide sleeve 1 , and the arc of the arc projection 2 is equal to 180 degrees. The inner wall of the center hole of the guide sleeve 1 is provided with an inner thread, and the inner thread of the center hole of the guide sleeve 1 continues to the inner side wall of the arc convex block 2 .

As shown in FIG. 1 , the guide sleeve 1 is provided with a plurality of installation holes 3 along the axial direction. Both ends of the arc bump 2 are provided with a hoisting hole 2a, and the side of the guide sleeve 1 is provided with a hoisting hole 2 1a. Between holes a 2a.

As shown in FIG. 2 , the other end face of the guide sleeve 1 is integrally fixed with an annular protrusion 4 , the outer diameter of the annular protrusion 4 is smaller than the outer diameter of the guide sleeve 1 , and the center hole of the annular protrusion 4 is connected to the center of the guide sleeve 1 . The holes are directly connected to each other, and the inner thread of the central hole of the guide sleeve 1 continues to the inner wall of the central hole of the annular protrusion 4 . The outer side of the annular protrusion 4 has an annular shoulder 4a.

When making the guide device, first process a large ring structure with a central hole as a threaded hole. The size of the center hole of the large ring structure is the same as that of the threaded hole on the steam turbine. Install holes 3 evenly distributed along the circumference, and finally cut a circular arc gap with an radian equal to or less than 180 degrees on the large ring structure, so that the remaining structure forms a circular guide sleeve 1 and is integrally connected to the guide. The arc bump 2 on one end of the sleeve 1.

The guide device is mainly used to realize the rapid installation of the large nut on the high pressure main valve of the 1000MW steam turbine. Before installing the large nut, the guide device needs to be fixed first. Connect the hoisting screws at the hoisting hole 2 1a and the two hoisting holes 1 2a respectively, and then use the hoist to hoist the guide sleeve 1 to the position corresponding to the threaded hole port on the steam turbine through the cooperation of the wire rope and each hoisting screw. Before hoisting, it is necessary to ensure that the inner side wall of the arc projection 2 is upward, and the entire guide sleeve 1 can be kept horizontal and not inclined during the hoisting process by the distribution of the hoisting hole 2 1a and the two hoisting holes 1 2a.

As shown in FIG. 3 , after the guide sleeve 1 is lifted to the corresponding position, the guide sleeve 1 is fixed on the steam turbine through the cooperation of the installation hole 3 and the fastener. The annular protrusion 4 on the guide sleeve 1 is inserted into the port of the threaded hole on the steam turbine, so that the internal thread on the guide sleeve 1 cooperates with the threaded hole on the steam turbine to form a continuous internal thread structure. After the guide sleeve 1 is installed, use the crane to lift the large nut to be installed above the arc bump 2. Since the arc of the arc bump 2 is 180 degrees, it means that the large nut can be directly put into the circle. At the same time, since the internal thread on the guide sleeve 1 is matched with the threaded hole on the steam turbine to form a continuous internal thread structure, it is only necessary to use the tool to rotate the large nut to make the large nut self-guided in the guide sleeve 1. Screw all the way into the threaded hole on the turbine. After the large nut is installed, the guide sleeve 1 can be removed.

By setting the inner thread on the guide sleeve 1 from the inner wall of the circular arc bump 2 to the inner wall of the annular protrusion 4, after the guide sleeve 1 is fixed on the steam turbine, it is equivalent to extending the threaded hole on the steam turbine to the outside of the steam turbine. And through the arrangement of the arc bumps 2, the large nut can be quickly and accurately matched with the threaded hole on the steam turbine, thereby improving the convenience of installing the large nut on the steam turbine. In addition, the applicability of the guide device is also relatively wide, and it can be used when large-scale equipment needs to be installed with large-scale nuts.

The guide also includes an annular washer. In order to ensure the continuity of the thread, when the distance between the end face of the internal thread on the guide sleeve 1 and the end face of the threaded hole on the steam turbine does not meet a pitch, an annular washer can be used to set the distance between the two to increase the thickness of the guide sleeve. The distance between the end face of the internal thread on the steam turbine and the end face of the threaded hole on the steam turbine satisfies a pitch.

Embodiment 2

The structure and principle of this embodiment are basically the same as those of the first embodiment, the difference is that: in this embodiment, the arc of the circular arc bump 2 is less than 180 degrees.

The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or replace them in similar ways, but will not deviate from the spirit of the present invention or go beyond the appended claims the defined range.

Claims (5)

1. The utility model provides a guider for installing large-scale nut, including being annular uide bushing (1) of circle, a serial communication port, a terminal surface an organic whole of uide bushing (1) has linked firmly circular arc lug (2), the inside wall of circular arc lug (2) flushes with the central hole portion inner wall of uide bushing (1) mutually, the radian of circular arc lug (2) equals or is less than 180 degrees, the centre hole inner wall of uide bushing (1) is equipped with the internal thread that internal thread and uide bushing (1) centre bore continues to the inside wall of circular arc lug (2), it is provided with a plurality of mounting holes (3) to run through along the axial on uide bushing (1), each mounting hole (3) are along circumference distribution and partial mounting hole (3) run through circular arc lug (2).

2. The guide device for mounting the large nut as claimed in claim 1, wherein the other end face of the guide sleeve (1) is fixedly connected with an annular protrusion (4), the outer diameter of the annular protrusion (4) is smaller than that of the guide sleeve (1), the central hole of the annular protrusion (4) is in direct communication with the central hole of the guide sleeve (1), and the internal thread of the inner wall of the central hole of the guide sleeve (1) is continued to the inner wall of the central hole of the annular protrusion (4).

3. Guide device for mounting large nuts, according to claim 2, characterized in that the outside of the annular projection (4) has an annular shoulder (4 a).

4. The guide device for mounting the large nut as claimed in claim 1, 2 or 3, wherein the two end faces of the arc-shaped protrusion (2) are provided with a first hoisting hole (2a), the lateral part of the guide sleeve (1) is provided with a second hoisting hole (1a), the directions of the first hoisting hole (2a) and the second hoisting hole (1a) are the same, and the second hoisting hole (1a) is located between the first hoisting hole (2 a).

5. A guide means for mounting a large nut according to claim 4, wherein the guide means further comprises an annular washer.

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