CN112161748A

CN112161748A - Three-jaw outer clamp end face sealing type hydraulic sealing device and test method

Info

Publication number: CN112161748A
Application number: CN202011052645.1A
Authority: CN
Inventors: 马晓忠
Original assignee: Wuxi Huaguang Environment and Energy Group Co Ltd
Current assignee: Wuxi Huaguang Environment and Energy Group Co Ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-01-01
Anticipated expiration: 2040-09-29
Also published as: CN112161748B

Abstract

The invention relates to the field of hydraulic test sealing tools for a header or a pipe in boiler manufacturing, in particular to a three-jaw external clamping end face sealing type hydraulic sealing device and a test method, which can meet the hydraulic test of a thick-wall pipe, and have the advantages of high universality, safety and reliability. The pipe end part sealing device comprises a cover plate and a base, wherein a three-jaw clamping block with an inclined outer end surface is installed in an inclined cavity of the base, a pressing handle is installed outside the base, the base is sleeved on a pipe and clamped on the surface of the pipe through the three-jaw clamping block, a gap is reserved between the cover plate and the base and is connected with a tensioning nut through the tensioning bolt, a sealing rubber ring matched with the end part of the pipe is arranged on the cover plate and is fixed through a fixing bolt matched with the fixing nut penetrating through the cover plate, a through hole is formed in the fixing bolt, and a sealing cover is in threaded connection with the end part of the fixing bolt.

Description

Three-jaw outer clamp end face sealing type hydraulic sealing device and test method

Technical Field

The invention relates to the field of hydraulic test sealing tools for a header or a pipe in boiler manufacturing, in particular to a three-jaw external clamping end face sealing type hydraulic sealing device and a test method.

Background

In the manufacturing process of the boiler, hydraulic tests are required to be carried out on pipes or headers with various types and sizes so as to check the welding manufacturing quality of the pipes or the headers. In the process of carrying out the hydraulic test, the pipe orifice of the pipe or the header needs to be sealed. In general, the sealing form of the nozzle in the hydraulic test is as follows: welding a sealing plate, expanding the plug inside and the like. The sealed mode main problem of welding the shrouding is to get rid of the shrouding after needs welding shrouding, water pressure, processes such as the mouth of pipe of polishing can increase great work load. The internal expansion plug type water pressure sealing device is simple to install and use, but the requirement on the size precision of the inner diameter of the pipe is high when the internal expansion plug type water pressure sealing device is used. At present, in the design and manufacture of a high-parameter boiler, a large number of thick-wall pipes are adopted, and in actual production, the situations that the purchased thick-wall pipes have large deviation of the pipe wall thickness, the roundness of inner holes of the pipes is out of round and the like are often found. The inner diameter of a part of pipes has more size deviation, the inner expansion type water pressure sealing device cannot well play a sealing role, and meanwhile, the inner expansion plug cannot generate good expansion force due to out-of-roundness of an inner hole, so that the influence on a pipe drainage water pressure test in actual production is large.

Disclosure of Invention

In order to solve the problem that the existing thick-wall pipe cannot complete a hydraulic test, the invention provides a three-jaw external clamping end face sealing type hydraulic sealing device and a test method, which can meet the hydraulic test of the thick-wall pipe, and have the advantages of high universality, safety and reliability.

The technical scheme is as follows: the utility model provides a three-jaw outer card end face sealed water pressure sealing device, its includes apron and base, the inclined cavity of base is installed the outer terminal surface and is the three-jaw chucking piece on inclined plane, the base externally mounted has the compress tightly handle, the base suit in the pipe and through three-jaw chucking piece chucking in the pipe surface, the apron with leave the clearance between the base and be connected with tensioning nut through tensioning bolt, be provided with on the apron with pipe tip complex sealing rubber circle, sealing rubber circle is through running through the fixing bolt cooperation fixing nut of apron is fixed, the through-hole has been seted up to the fixing bolt, fixing bolt tip threaded connection has sealed lid.

The three-jaw clamping block is further characterized in that the inner surface of the three-jaw clamping block is provided with a tooth-shaped thread;

the small-diameter end of the three-jaw clamping block is provided with a boss, and a detachable cushion block sleeved at the outer end of the three-jaw clamping block is arranged between the pressing handle and the boss.

A three-jaw outer clamping end face sealing type hydraulic seal test method is characterized by comprising the following steps:

(1) the three-jaw clamping block is arranged in an inclined cavity of the base, and then the pressing handle is connected with the base;

(2) sleeving the base on two ends of the pipe respectively, and rotating the pressing handle to clamp the three-jaw clamping block with the pipe;

(3) mounting an upper sealing rubber ring on the cover plate by using a fixing bolt to match with a fixing nut, connecting the cover plate with the base by using a tensioning bolt and a tensioning nut, and tightly pressing the end part of the pipe on the sealing rubber ring by adjusting the tensioning bolt and the tensioning nut;

(4) firstly, mounting a sealing cover on a fixing bolt at one end, taking down the sealing cover at the other end, and introducing water and pressurizing from a through hole on the fixing bolt without the sealing cover to perform a test; and after the completion, the sealing cover and the water passing position are exchanged, the test is carried out again, and finally the hydrostatic test of the two ends of the pipe is completed.

The method is further characterized in that after the hydrostatic test is completed, the surface of the pipe is polished by an indentation pressed by the three-jaw clamping block.

After the sealing rubber ring is adopted, the end face of the pipe is directly sealed, the sealing form is simple, the sealing rubber ring is not influenced by the inner diameter size and the shape deviation of the pipe, the universality is greatly improved, the outer wall of the pipe is clamped by the three-jaw clamping block, the three-jaw clamping block is insensitive to the influence of the size and the shape deviation of the outer wall of the pipe, the centering performance is good, the clamping reliability is improved, the integral structure is simple, the use is convenient, the universality is high, and the hydraulic sealing is safe and reliable.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view of a base;

FIG. 4 is a schematic view of a three-jaw clamping block;

FIG. 5 is a schematic view of a removable spacer.

Detailed Description

Referring to fig. 1 to 5, a three-jaw external clamping end face sealing type hydraulic sealing device comprises a cover plate 1 and a base 2, a three-jaw clamping block 3 with an inclined outer end face is installed in an inclined cavity of the base 2, a pressing handle 4 is installed outside the base 2, the pressing handle 4 is screwed into a thread at the rear end of the base 2, the base 2 is sleeved on a pipe 5 and clamped on the surface of the pipe 5 through the three-jaw clamping block 3, a gap is reserved between the cover plate 1 and the base 2 and connected with a tensioning nut 7 through the tensioning bolt 6, a sealing rubber ring 8 matched with the end of the pipe 5 is arranged on the cover plate 1, the sealing rubber ring 8 is fixed through a fixing bolt 9 penetrating through the cover plate 1 and matched with a fixing nut 10, a through hole is formed in the fixing bolt 10 and communicated with the pipe 5, a sealing cover 11 is connected with the end of the fixing bolt 10 through a thread, and a sealing. The inner surface of the three-jaw clamping block 3 is provided with a tooth-shaped thread, so that the gripping force with the pipe can be increased.

Boss 12 is installed to the path end on the three-jaw chucking piece 3, compresses tightly and is provided with the removable cushion 13 of suit in 3 outer ends of three-jaw chucking piece between handle 4 and the boss 12, and the use of removable cushion 12 can reduce the back-off distance that compresses tightly handle 4, increases the synchronism that three-jaw chucking piece 3 compressed tightly.

A three-jaw outer clamping end face sealing type hydraulic seal test method comprises the following steps:

(2) sleeving the base on two ends of the pipe respectively, generally keeping the distance between the front end surface of the base and the pipe orifice to be 50mm, and rotating the pressing handle to clamp the three-jaw clamping block with the pipe;

And after the hydrostatic test is finished, the surface of the pipe is polished by the indentation pressed by the three-jaw clamping block.

Claims

1. The utility model provides a three-jaw outer card end face sealed water pressure sealing device, its includes apron and base, its characterized in that, install the three-jaw chucking piece that outer terminal surface is the inclined plane in the oblique intracavity of base, base externally mounted has a compression handle, the base suit in the pipe and through three-jaw chucking piece chucking in the pipe surface, the apron with leave the clearance between the base and be connected with tensioning nut through tensioning bolt, be provided with on the apron with pipe tip complex sealing rubber circle, sealing rubber circle is fixed through the fixing bolt cooperation fixing nut who runs through the apron, the through-hole has been seted up to fixing bolt, fixing bolt tip threaded connection has sealed lid.

2. The three-jaw external-clamping end-face sealing type hydraulic sealing device as claimed in claim 1, wherein the inner surface of the three-jaw clamping block is provided with a toothed thread.

3. The three-jaw external clamping end face sealing type hydraulic sealing device as claimed in claim 1, wherein a boss is mounted at the small diameter end of the three-jaw clamping block, and a detachable cushion block sleeved at the outer end of the three-jaw clamping block is arranged between the pressing handle and the boss.

4. A three-jaw outer clamping end face sealing type hydraulic seal test method is characterized by comprising the following steps:

5. The method of claim 1, wherein after the hydrostatic test, the surface of the pipe is ground by an indentation formed by the three-jaw clamping block.