CN104588941A - Steel tube flange welding positioning clamp - Google Patents

Abstract

The invention discloses a steel pipe flange welding positioning fixture, which is mainly composed of a radial positioning block, a radial pressure block, an axial positioning block, a flange stopper and a short positioning pin installed on the positioning pin shaft, and the axial positioning block The outer diameter of the radial positioning block is larger than the inner diameter of the steel pipe and is close to the flange; the outer diameter of the radial positioning block is smaller than the inner diameter of the steel pipe and is close to the inner wall of the steel pipe. There is a tapered central hole in the middle, and one end of the radial pressure block is inserted into the radial positioning block. In the tapered central hole, locking nuts and gaskets are respectively installed at both ends of the positioning pin shaft; the outer periphery of the flange baffle is provided with pin holes corresponding to the flange, and the fixed connection is realized through short positioning pins. The invention realizes rapid axial and radial positioning of steel pipe flanges, and has a wide range of applications. It can locate steel pipe flanges of different specifications, and only needs to select corresponding axial positioning blocks and radial positioning blocks, which can significantly improve production. efficiency and welding quality.

Description

Steel pipe flange welding positioning fixture

technical field

The invention relates to the technical field of welding tools, in particular to a steel pipe flange welding positioning fixture.

technical background

Fixtures are an important process equipment in the machinery manufacturing industry. Reasonably designed fixtures can ensure the quality of machining, improve labor productivity, reduce production costs, and reduce labor intensity.

At present, automatic welding is widely used in the welding of steel pipe flanges, which improves the welding quality and welding efficiency to a certain extent. However, many steel pipe-flange automatic welding devices have deficiencies. Their shortcomings and deficiencies are that it is difficult to ensure the accurate axial and radial positioning of the flange and the steel pipe. Usually, the alignment is done manually with the help of a strip level and a steel angle. Then fix the flange and steel pipe by spot welding, and finally clamp it to the automatic welding equipment for welding. This method is cumbersome and time-consuming to operate, has unstable quality, low production efficiency, and high labor intensity, which seriously restricts the advantages of automatic welding of steel pipe flanges.

Contents of the invention

The purpose of the present invention is to provide a steel pipe flange welding positioning fixture to solve the problems of manual alignment during automatic welding of steel pipe flanges, cumbersome and time-consuming spot welding positioning, unstable quality, low production efficiency and high labor intensity.

To achieve the above object, the present invention adopts the following technical solutions:

The steel pipe flange welding positioning fixture of the present invention mainly consists of a positioning pin shaft 1, a radial positioning block 12, a radial pressure block 4, an axial positioning block 11, a flange stopper 5 and a short positioning pin 6, and the radial pressure The block 4, the radial positioning block 12, the axial positioning block 11 and the flange stopper 5 are installed on the positioning pin shaft 1 in sequence, and the axial positioning block 11 is placed between the radial positioning block 12 and the flange stopper 5, Its outer diameter is larger than the inner diameter of the steel pipe, and is close to the flange; the outer diameter of the radial positioning block 12 is smaller than the inner diameter of the steel pipe and is close to the inner wall of the steel pipe. Into the tapered central hole of the positioning block 12 and form a tight fit, the two ends of the positioning pin shaft 1 are respectively equipped with locking nuts and gaskets; the outer periphery of the flange stopper 5 is provided with pin holes corresponding to the flange , and through the short positioning pin 6 to achieve a fixed connection.

The radial positioning block 12 of the present invention is surrounded by three arc-shaped blocks with the same shape and can be separated from each other, and 6 through holes are evenly distributed in the circumferential direction.

The flange retaining plate 5 of the present invention is provided with a center hole that transitionally fits with the positioning pin shaft 1, and is provided with multiple sets of pin holes of different specifications in the circumferential direction, corresponding to flange bolt holes of different specifications, and each set of 3 , The positioning short pin passes through the 3 bolt holes of the flange and the 3 positioning holes of the flange baffle to realize the radial positioning of the flange.

One end of the positioning pin shaft 1 protruding from the flange stopper 5 according to the present invention is provided with a through hole that can be pulled out and inserted into the rotary handle 9 at any time.

The advantages of the steel pipe flange welding positioning fixture of the present invention are:

1. The use of conical surface fit has a good centering effect, and multiple disassembly does not affect the coaxiality of the inner and outer cone axes, ensuring the coaxiality of the steel pipe and the flange.

2. The flange retaining plate can be provided with multiple sets of positioning pin holes according to the needs. For the positioning of steel pipe flanges of different specifications, only the axial positioning block of the corresponding thickness and the radial positioning block of the corresponding diameter can be used. Therefore, the scope of application wide.

3. The present invention has simple structure, simple structure, convenient installation, accurate positioning, can significantly improve production efficiency, ensure welding quality, and is convenient and reliable in use, with low manufacturing cost.

Description of drawings

Fig. 1 is a structural schematic diagram of a steel pipe flange welding positioning jig of the present invention.

Fig. 2 is a schematic view along the direction A of Fig. 1 .

Fig. 3 is a structural schematic diagram of the radial positioning block in Fig. 1 .

FIG. 4 is a schematic right view of FIG. 3 .

In the figure: 1, positioning pin shaft 2, nut 3, gasket 4, radial pressure block 5, flange stopper 6, short positioning pin 7, gasket 8, nut 9, handle 10, flange 11, axial Positioning block 12, radial positioning block 13, steel pipe.

Detailed ways

As shown in Figure 1 and Figure 2, the steel pipe flange welding positioning fixture of the present invention includes a radial positioning block 12, a radial pressure block 4, a nut 2, a gasket 3, a positioning pin shaft 1, an axial positioning block 11, a flange Baffle plate 5, short positioning pin 6, gasket 7, nut 8, rotary handle 9. The radial pressure block 4, the radial positioning block 12, the axial positioning block 11 and the flange stopper 5 are sequentially installed on the positioning pin shaft 1 from left to right, and the axial positioning block 11 is placed on the radial positioning block 12 and the method. Between the blue baffle plates 5, its outer diameter is larger than the inner diameter of the steel pipe 13, and is close to the flange 10; the outer diameter of the radial positioning block 12 is smaller than the inner diameter of the steel pipe 13 and is close to the inner wall of the steel pipe, and a tapered central hole is provided in the middle; The pressure block 4 is provided with an outer tapered surface that forms a taper fit with the inner tapered surface of the radial positioning block 12, and is provided with a central hole that forms a transition fit with the positioning pin shaft 1, and one end of the radial pressure block 4 is inserted into the radial positioning In the tapered central hole of the block 12 and form a tight fit; a locked nut 2 and a gasket 3 are installed on the left end of the positioning pin shaft 1, and a nut 9 and a gasket 8 are installed on the right end of the positioning pin shaft 1; the flange The baffle plate 5 is provided with a central hole that transitionally fits with the positioning pin shaft 1, and there are 3 groups of pin holes of different specifications distributed in the circumferential direction, corresponding to the three specifications of the diameters of the center circle of the flange bolt hole: ΦB, ΦC, and ΦD. The flanges are in groups of 3, and the positioning short pins 6 pass through 3 bolt holes in the flange and 3 positioning holes of the flange retainer, so as to realize radial positioning of the flange.

The radial positioning block 12 of the present invention is surrounded by three arc-shaped blocks with the same shape and can be separated from each other. There are 6 through holes evenly distributed in the circumferential direction, which can reduce the weight, as shown in Fig. 3 and Fig. 4 .

One end of the positioning pin shaft 1 protruding from the flange stopper 5 according to the present invention is provided with a through hole that can be pulled out and inserted into the rotary handle 9 at any time.

The outer diameter of the axial positioning block 11 of the present invention is smaller than the inner diameter of the flange, and larger than the inner diameter of the steel pipe. The axial positioning block limits the distance between the right end face of the steel pipe and the right end face of the flange, and realizes the axial positioning of the steel pipe flange. .

The working principle of the steel pipe flange welding positioning fixture of the present invention is as follows:

First, clamp the left end of the steel pipe 13 on the chuck of the automatic welding device, then press the flange 10 on the left end face of the flange stopper 5 of the fixture of the present invention, and insert the short positioning pin 6 to radially locate the flange 10. Then put one end of the clamp of the present invention equipped with the radial positioning block 12 into the steel pipe, and make the axial positioning block 11 close to the right end face of the steel pipe 13, and the axial positioning block 13 also limits the right end face of the steel pipe and the right end face of the flange distance, so as to realize the axial positioning of the steel pipe flange. On the other hand, the nut 8 is manually tightened with a wrench, and the rotation of the positioning pin shaft 1 is avoided by fixing the rotating handle 9 during the tightening of the nut 8 . As the nut 8 is continuously tightened, the nut 2 and the gasket 3 at the left end will continuously press the radial pressure block 4 to the right, and the radial pressure block 4 will generate radial pressure on the radial positioning block 12 to make it expand outward and Tighten the inner wall of the steel pipe so that the steel pipe, the positioning pin and the flange are coaxial, that is, the steel pipe and the flange are coaxial. The positions of the steel pipe and the flange have been fixed, and when the automatic welding device is started, the steel pipe, the flange and the fixture are all rotated synchronously, and the steel pipe and the flange are automatically welded.

Claims (4)

1. Steel pipe flange welding positioning fixture is characterized in that it is mainly composed of positioning pin shaft (1), radial positioning block (12), radial pressure block (4), axial positioning block (11), flange stop Disk (5) and short positioning pin (6), radial pressure block (4), radial positioning block (12), axial positioning block (11) and flange stopper (5) are installed on the positioning pin shaft in sequence (1), the axial positioning block (11) is placed between the radial positioning block (12) and the flange stopper (5), its outer diameter is larger than the inner diameter of the steel pipe, and it is close to the flange; the radial positioning The outer diameter of the block (12) is smaller than the inner diameter of the steel pipe and it is close to the inner wall of the steel pipe. There is a tapered central hole in the middle, and one end of the radial pressure block (4) is inserted into the tapered central hole of the radial positioning block (12) to form a The two ends of the positioning pin shaft (1) are respectively equipped with locking nuts and gaskets; the outer periphery of the flange stopper (5) is provided with pin holes corresponding to the flange, and through the short positioning pin (6 ) to achieve a fixed connection. 2. The steel pipe flange welding positioning fixture according to claim 1, characterized in that: the radial positioning block (12) is surrounded by three arc-shaped blocks with the same shape and can be separated from each other, and its circumferential direction is evenly distributed There are 6 through holes. 3. The steel pipe flange welding positioning fixture according to claim 1 or 2, characterized in that: the flange retainer (5) is provided with a central hole for transitional fit with the positioning pin shaft (1), and is provided with multiple holes in the circumferential direction. A group of pin holes of different specifications corresponds to flange bolt holes of different specifications, and every group of 3, the positioning short pins pass through the 3 bolt holes of the flange plate and the 3 positioning holes of the flange stopper to realize The flange is positioned radially. 4. The steel pipe flange welding positioning fixture according to claim 1 or 2, characterized in that: one end of the positioning pin shaft (1) protruding from the flange retaining plate (5) is equipped with a screw that can be pulled out and inserted at any time The through hole of the handle (9).