CN110090879B - Bending device for welding steel pipes - Google Patents

Abstract

The invention discloses a bending device for welded steel pipes, which is used to bend and close the steel strips into shape. The bending device includes a frame and at least one group of bending devices arranged sequentially along the direction from one end of the frame to the other end. Bending components and multiple sets of closed components. The bending components include upper molds and lower molds respectively located on both sides of the steel strip in the vertical direction. The mold surfaces of the upper mold and the lower mold are W-shaped, and the upper mold and the lower mold can cooperate. Bend the steel strip into a W shape. The bending device for welded steel pipes of the present invention can bend the steel strip into a W shape and then bend it into shape through the arrangement of the bending component and the closing component, so that the two longitudinal sides of the steel strip can be bent vertically It is straight and transverse with no height difference to achieve stability during welding, and overcomes the problem of unstable welding caused by excessive rebound force of the steel strip caused by C-shaped bending in the prior art.

Description

A bending device for welded steel pipes

Technical field

The invention relates to the field of manufacturing welded steel pipes, and in particular to a bending device for welded steel pipes.

Background technique

Welded steel pipe refers to a steel pipe with seams on the surface, which is made by bending and deforming steel strips or steel plates into circular, square and other shapes and then welding them. In the prior art, the steel strip is usually directly and gradually bent into a C-shaped closed tube, and then welded. However, since the steel strip has a rebound force when it is bent, the thicker the steel strip, the greater the rebound force. The larger rebound force generated by direct bending greatly affects the stability of the welding and affects the subsequent welding. The quality of steel pipes.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a bending device for welding steel pipes. The bending device can well overcome the rebound force when the steel strip is bent, improve the stability of the welding, and ensure improve the quality of the welded steel pipes produced.

In order to achieve the above object, the technical solution adopted by the present invention is:

A bending device for welded steel pipes, used to bend and close the steel strip into shape. The bending device includes a frame and at least one group of bending devices arranged sequentially from one end to the other end of the frame. Curved components and multiple groups of closed components,

The bending assembly includes an upper mold and a lower mold respectively located on both sides of the steel strip in the vertical direction. The mold surfaces of the upper mold and the lower mold are W-shaped. The upper mold and the lower mold The mold can cooperate to bend the steel strip into a W shape;

The closing assembly includes two rotatable pressure rollers respectively disposed on both sides of the steel strip perpendicular to its feeding direction. The rotation axis of the pressure roller extends along the horizontal direction or the vertical direction and is perpendicular to the feeding direction. The two pressure rollers can cooperate to gradually bend and close the W-shaped steel strip.

Preferably, the upper mold and the lower mold are rotatably mounted on the frame.

Preferably, a W-shaped bending gap is formed between the upper mold and the lower mold, and the steel strip can pass through the bending gap.

Further preferably, there are two groups of the bending components, and they are arranged sequentially along the feeding direction of the steel strip.

Further preferably, the bending gap of the two sets of bending assemblies gradually decreases along the feeding direction of the steel strip.

Preferably, the pressure roller includes a rotatable rotating shaft and a roller surface sleeved on the rotating shaft, and the roller surface can cooperate with and resist the outer surface of the steel strip.

Preferably, the closing assembly further includes a bracket provided on the frame, and the two pressure rollers can be slidably installed on the bracket in a direction toward or away from each other.

Preferably, the pressure rollers include vertical rollers located on the vertical sides of the steel strip and flat rollers located on the horizontal sides of the steel strip, and the vertical rollers and the flat rollers are arranged along the Feeding direction interval setting.

Preferably, the bending device further includes a spray assembly provided on the frame for spraying lubricating fluid onto the steel strip.

Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the bending device for welded steel pipes of the present invention can bend the steel strip into a shape through the arrangement of the bending component and the closing component. W-shaped and then bent into shape, the two longitudinal sides of the steel strip after bending are straight and horizontal with no height difference, so as to achieve stability during welding and overcome the problems caused by the C-shaped bending of the steel strip in the existing technology. The problem of unstable welding caused by excessive rebound force.

Description of the drawings

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is a schematic cross-sectional view of the bending assembly of the present invention.

Among them: 1. Machine frame; 2. Bending component; 2a, upper mold; 2b, lower mold; 2c, bending gap; 3. Closing component; 3a, pressure roller; 3a1, vertical roller; 3a2, flat roller; 3b , bracket; 3c, screw rod; 3d, first slider; 3e, second slider; 4, spray component;

100. Steel strip.

Detailed ways

The technical solution of the present invention will be further described below with reference to the accompanying drawings.

As shown in Figure 1-2, a bending device for welded steel pipes is used to bend and close the steel strip 100 into shape. The bending device includes a frame 1 and a direction from one end of the frame 1 to the other end. At least one set of bending components 2 and multiple sets of closing components 3 are arranged in sequence. The bending components 2 include upper molds 2a and lower molds 2b respectively located on both sides of the steel strip 100 in the vertical direction. The upper molds 2a and the lower molds 2b The mold surface is W-shaped, and the upper mold 2a and the lower mold 2b can cooperate to bend the steel strip 100 into a W-shape; the closing component 3 includes two rotatable presses on both sides of the steel strip 100 perpendicular to its feeding direction. The rotation axes of the roller 3a and the pressure roller 3a extend along the horizontal or vertical direction and are perpendicular to the feeding direction. The two pressure rollers 3a can cooperate to gradually bend and close the W-shaped steel strip 100.

Through the setting of the bending component 2 and the closing component 3, the steel strip 100 can be bent into a W shape and then bent into shape, so that the two longitudinal sides of the steel strip 100 after bending are straight and straight in the longitudinal direction and have no height difference in the transverse direction, so as to achieve welding. It overcomes the problem of unstable welding caused by excessive rebound force of steel strip 100 caused by C-shaped bending in the prior art.

In this embodiment, the upper mold 2a and the lower mold 2b are rotatably installed on the frame 1. A W-shaped bending gap 2c is formed between the upper mold 2a and the lower mold 2b, and the steel strip 100 can pass through the bending gap 2c. Here, the upper mold 2a and the lower mold 2b are driven to rotate by a motor.

There are two groups of bending components 2, and they are arranged sequentially along the feeding direction of the steel strip 100. The bending gap 2c of the two sets of bending assemblies 2 gradually decreases along the feeding direction of the steel strip 100. Here, the bending gap 2c can be changed according to requirements, and the upper mold 2a and the lower mold 2b can slide in the direction of approaching or moving away from each other, and they are raised and lowered by the screw drive. The pressure roller 3a includes a rotatable rotating shaft and a roller surface sleeved on the rotating shaft. The roller surface can cooperate with and resist the outer surface of the steel strip 100.

In this embodiment, the closing assembly 3 further includes a bracket 3b provided on the frame 1, and the two pressure rollers 3a can be slidably installed on the bracket 3b in the direction of approaching or moving away from each other. Here, the pressure roller 3a slides through the screw rod 3c. The two ends of the rotating shaft of the pressure roller 3a are respectively connected to the first slide block 3d on the bracket 3b. The first slide block 3d is threadedly connected to the screw rod 3c. By rotating the screw The lever 3c enables the sliding of the pressure roller 3a. Here, the sliding structure of the upper mold 2a and the lower mold 2b is the same as that of the pressure roller, and both are lifted and lowered by screw sliders, but they are not shown in the figure.

The pressure roller 3a includes a vertical roller 3a1 provided on the vertical side of the steel strip 100 and a flat roller 3a2 provided on the horizontal side of the steel strip 100. The vertical roller 3a1 and the flat roller 3a2 are spaced apart along the feeding direction. By setting the vertical rollers 3a1 and the flat rollers 3a2 at intervals, the steel strip 100 can be pressed sequentially in the horizontal and vertical directions, thereby improving the flatness and linearity of the produced steel pipe. Here, both ends of the flat roller 3a2 are brackets 3b, the lower end of the vertical roller 3a1 is connected to the bracket 3b, and the upper end is inserted into a second slider 3e with a chute (not shown in the figure). The upper end of the vertical roller 3a1 can Slide inside the chute.

In this embodiment, the bending device further includes a spray assembly 4 provided on the frame 1 for spraying lubricating liquid onto the steel strip 100 . The spray assembly 4 includes a spray pipe and a lubricating liquid storage and pressurizing device (not shown in the figure) for providing lubricating liquid to the spray pipe. The nozzle of the spray pipe faces the steel plate. The lubricating fluid here is grease with a kinematic viscosity of 80~90mm²/S at 40°C and a freezing point of -3~12°C. By spraying lubricant, the huge pressure and friction generated when the steel plate is bent is reduced, further improving the stability of the welding.

The above embodiments are only for illustrating the technical concepts and characteristics of the present invention. Their purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly. They cannot limit the scope of protection of the present invention. All equivalent changes or modifications made based on the spirit and essence of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A bending device for welding steel pipe for with steel band (100) closed shaping of bending, its characterized in that: the bending device comprises a frame (1), at least one group of bending assemblies (2) and a plurality of groups of closing assemblies (3) which are sequentially arranged along the direction from one end to the other end of the frame (1), wherein each bending assembly (2) comprises an upper die (2 a) and a lower die (2 b) which are respectively arranged at two sides of the steel strip (100) in the vertical direction, the die surfaces of the upper die (2 a) and the lower die (2 b) are W-shaped, and the upper die (2 a) and the lower die (2 b) can be matched to bend the steel strip (100) into W-shaped; the closing assembly (3) comprises two pressing rollers (3 a) which are respectively and rotatably arranged at two sides of the steel belt (100) perpendicular to the feeding direction, the rotation axis of each pressing roller (3 a) extends along the horizontal direction or the vertical direction and is perpendicular to the feeding direction, and the two pressing rollers (3 a) can be matched to gradually bend and close the W-shaped steel belt (100) for forming;

a W-shaped bending gap (2 c) is formed between the upper die (2 a) and the lower die (2 b), and the steel strip (100) can pass through the bending gap (2 c);

the bending assemblies (2) are provided with two groups and are sequentially arranged along the feeding direction of the steel belt (100);

bending gaps (2 c) of the two groups of bending assemblies (2) are gradually reduced along the feeding direction of the steel belt (100);

the closing component (3) further comprises a bracket (3 b) arranged on the frame (1), and the two pressing rollers (3 a) can be slidably arranged on the bracket (3 b) along the direction of approaching or separating from each other.

2. A bending apparatus for welded steel pipes according to claim 1, wherein: the upper die (2 a) and the lower die (2 b) are rotatably arranged on the frame (1).

3. A bending apparatus for welded steel pipes according to claim 1, wherein: the compression roller (3 a) comprises a rotatable rotating shaft and a roller surface sleeved on the rotating shaft, and the roller surface can be matched and abutted to the outer side surface of the steel belt (100).

4. A bending apparatus for welded steel pipes according to claim 1, wherein: the press roll (3 a) comprises a vertical roll (3 a 1) arranged on the side part of the steel strip (100) in the vertical direction and a flat roll (3 a 2) arranged on the side part of the steel strip in the horizontal direction, and the vertical roll (3 a 1) and the flat roll (3 a 2) are arranged at intervals along the feeding direction.

5. A bending apparatus for welded steel pipes according to claim 1, wherein: the bending device further comprises a spraying assembly (4) which is arranged on the frame (1) and used for spraying lubricating liquid onto the steel belt (100).