Pressing device for internal blowing of hot-dip galvanized steel pipe

Abstract

The utility model provides a hot-dip galvanized steel pipe internal blowing hold-down device which comprises a rack, a first piston cylinder, a first connecting shaft, a second connecting shaft, a lower pressing plate and a lower support, the lower support is installed on one side of the rack, the rack is provided with the first piston cylinder, the movable end of the first piston cylinder is rotatably connected to one end of the lower pressing plate through the first connecting shaft, and the movable end of the second connecting shaft is rotatably connected to the other end of the lower pressing plate. The lower pressing plate is rotationally connected to the rack through a second connecting shaft, a steel pipe is arranged on the rack, and the other end of the lower pressing plate can abut against the periphery of the steel pipe. According to the pressing device for inward blowing of the hot-dip galvanized steel pipe, axial force borne by the steel pipe is converted through the lower pressing plate, so that the direction of torque is converted into the axial direction of the first piston air cylinder, and then a shaft rod of the first piston air cylinder is not bent. After the device is installed and used, the problems of temporary production halt for maintenance and replacement of accessories such as the air cylinder due to bending of the piston rod are solved, the production efficiency is improved, and meanwhile the maintenance fund is saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of steel pipe hot galvanizing, especially relates to a hot galvanizing steel pipe inner blowing pressure device. BACKGROUND

[0002] In the steel pipe hot galvanizing production, its production process is: acidic degreasing and oil removal, pickling and rust removal, two water rinsing, plating aid treatment, drying, hot galvanizing, gas outer wiping zinc, high-temperature inner wiping zinc, water cooling, chemical anti-rust treatment, drying, quality inspection, packaging, warehousing. In order to ensure the adhesion of the zinc coating of the hot galvanizing steel pipe and the smoothness of the surface, the wiping of the outer surface of the zinc coating (commonly known as outer blowing zinc) and the wiping of the inner diameter surface (commonly known as inner blowing zinc) are respectively arranged on the hot galvanizing process; in the existing process technology, the piston rod of the air cylinder is often used to press the end head of the steel pipe from top to bottom, and then a guide rod composite device is used to wipe the residual zinc and zinc nodules on the inner diameter surface of the steel pipe by using 0.8~1.2MPa pressure and 400~420℃ superheated steam, so as to obtain a smooth inner diameter surface and complete the wiping process of the inner surface of the hot galvanizing steel pipe.

[0003] In the existing technology, in the process of inner blowing zinc of the hot galvanizing steel pipe, a micro piston type air cylinder and an up-down installation structure are used, a concave pressing iron block is arranged at the end of the piston rod, the end pipe head of the hot galvanizing steel pipe is pressed, and then 400℃~420℃ superheated steam is introduced through the inner blowing hollow guide rod to wipe and treat the residual zinc and zinc nodules adhered to the inner diameter surface of the steel pipe. Especially when the diameter of the hot galvanizing steel pipe is DN15~DN32, after the upper end head is clamped, the inner blowing is carried out, because there are more residual zinc and zinc nodules adhered to the inner diameter surface of the steel pipe, the inner wall welding ribs are too thick, the welding slag is not removed and other factors, after the blowing head of the inner blowing guide rod moves away from the clamping device together with the steel pipe, at this time, because the clamping mechanism clamps the pipe opening of the steel pipe, about 0.8~1.0MPa tension is generated and acts on the end of the piston cylinder rod, which causes the piston rod to bend radially under the action of the tension; after the piston rod bends radially, the steel pipe cannot be wiped and treated for zinc nodules, and the machine needs to be stopped for maintenance, the piston cylinder needs to be removed by maintenance staff in time, and a new piston cylinder and related guide rod wiping assembly need to be replaced, which is time-consuming and affects the normal production of zinc plating, each time needs to be maintained and replaced in high-altitude operation, the fastest maintenance speed needs more than 1 hour, and the zinc plating production of the steel pipe is reduced by about 20~25t / h.

[0004] In the existing steel pipe hot galvanizing production enterprises in China, in view of the above problems of affecting normal production caused by the bending of the piston rod of the air cylinder, technical personnel have been exploring and researching how to solve this difficult problem for a long time, and it has been listed as one of the technical research projects in the steel pipe galvanizing industry, and it is urgently needed to be effectively and completely solved. SUMMARY

[0005] Therefore, the utility model discloses a kind of hot-dip galvanized steel pipe inner blow's compression device, to solve the problem of existing technology when carrying out inner blow to steel pipe, if there is zinc tumor in steel pipe, steel pipe will exist axial force due to blowing Buddha, steel pipe will take the telescopic rod of compression cylinder, cause compression cylinder cannot be normally used, reduce production efficiency.

[0006] To achieve the above object, the technical scheme of the utility model is as follows:

[0007] A kind of hot-dip galvanized steel pipe inner blow's compression device, including rack, first piston cylinder, first connecting shaft, second connecting shaft, lower pressing plate and lower support, lower support is installed to one side of rack, first piston cylinder is set on rack, and the movable end of first piston cylinder is rotatably connected to one end of lower pressing plate by first connecting shaft, lower pressing plate is rotatably connected to rack by second connecting shaft, steel pipe is set on lower support, and the other end of lower pressing plate can abut to the periphery of steel pipe.

[0008] Further, the rack is slidably provided with a lifting frame, and a second piston cylinder is provided on one side of the lifting frame, with the movable end of the second piston cylinder being rotatably connected to the rack. The first piston cylinder is mounted to the lifting frame, and the middle portion of the lower pressing plate is rotatably connected to the lifting frame by the second connecting shaft.

[0009] Further, the cross section of the lower pressing plate is Z-shaped.

[0010] Further, the lower pressing plate includes a rocker arm, a connecting rod and a toothed plate. One end of the rocker arm is rotatably connected to the movable end of the first piston cylinder by the first connecting shaft, and the other end of the rocker arm is fixedly sleeved to the second connecting shaft. The second connecting shaft is rotatably sleeved to the lifting frame by a shaft seat. One end of the connecting rod is fixedly sleeved to the second connecting shaft, and the other end of the connecting rod is mounted with the toothed plate. The lower end of the toothed plate can abut to the periphery of the steel pipe.

[0011] Further, the lower end of the toothed plate is provided with a V-shaped notch.

[0012] Further, at least two rocker arms are provided on the second connecting shaft, and each rocker arm is provided with one first piston cylinder.

[0013] Further, a plurality of connecting rods are mounted on the second connecting shaft, and one toothed plate is mounted on each connecting rod.

[0014] Further, a pipe end rack is provided on the lower support, and the pipe end rack is provided with positioning openings. The periphery of the pipe end of the steel pipe is located in the positioning openings, and each notch corresponds to one positioning opening.

[0015] The hot galvanized steel pipe inner blowing compression device has the following beneficial effects: in the process of removing the zinc tumor on the inner diameter surface of the DN15~DN32 hot galvanized steel pipe by inner blowing, when the inner blowing guide rod is blocked by resistance while advancing in the inner diameter of the steel pipe, the axial force of the steel pipe acts on the lower pressing plate, the lower pressing plate acts on the outer surface of the steel pipe through the axial force of the first piston cylinder, the axial force of the steel pipe is converted by the lower pressing plate, so that the direction of the torque is converted into the axial direction of the first piston cylinder, and then the bending of the shaft rod of the first piston cylinder is avoided. After the device is installed and used, the bending of the piston rod is avoided, the problems of temporary shutdown for maintenance, replacement of the cylinder and other accessories are avoided, the production efficiency is improved, and maintenance funds are saved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the application. The embodiments of the application and its features are described with reference to the drawings. In the drawings:

[0017] Figure 1 The structure schematic view of the lower pressing plate of the hot galvanized steel pipe inner blowing compression device not being pressed to the steel pipe is described in the embodiments of the application;

[0018] Figure 2 The structure schematic view of the lower pressing plate of the hot galvanized steel pipe inner blowing compression device being pressed to the steel pipe is described in the embodiments of the application;

[0019] Figure 3 The upper view structure schematic view of the first piston cylinder and the lower pressing plate cooperating is described in the embodiments of the application;

[0020] Figure 4 The front view schematic view of the notch and the positioning port acting on the steel pipe is described in the embodiments of the application.

[0021] BRIEF DESCRIPTION OF DRAWINGS

[0022] 1 - rack; 2 - first piston cylinder; 3 - first connecting shaft; 4 - second connecting shaft; 5 - lower pressing plate; 51 - rocker arm; 52 - connecting rod; 53 - tooth plate; 54 - notch; 6 - lifting frame; 7 - second piston cylinder; 8 - steel pipe; 9 - lower support; 91 - pipe end support; 92 - positioning port. DETAILED DESCRIPTION

[0023] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0024] In the description of the utility model, need understanding is, the term "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "internal", "external" and so on indicate the orientation or positional relation based on the orientation or positional relation shown in the drawing, just for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore cannot be understood as the limitation to the utility model. In addition, the term "first", "second" and so on are just for the description purpose, and cannot be understood as indicating or implying the relative importance or implying the indicated technical features. Therefore, the features limited by "first", "second" and so on can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0025] In the description of the utility model, it needs to be explained that, unless otherwise expressly provided and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0026] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0027] As Figures 1-4As shown, a hot-dip galvanized steel pipe blowing compacting device, including frame 1, first piston cylinder 2, first connecting shaft 3, second connecting shaft 4, lower pressing plate 5 and lower support 9, the lower support 9 is installed to one side of the frame 1, the frame 1 is provided with the first piston cylinder 2, and the movable end of the first piston cylinder 2 is rotatably connected to one end of the lower pressing plate 5 through the first connecting shaft 3, the lower pressing plate 5 is rotatably connected to the frame 1 through the second connecting shaft 4, and the cross section of the lower pressing plate 5 is Z-shaped structure. The lower support 9 is provided with a steel pipe 8, and the other end of the lower pressing plate 5 can abut to the periphery of the steel pipe 8. In the process of removing the zinc tumor on the inner diameter surface of the DN15~DN32 hot-dip galvanized steel pipe 8 by blowing, when the inner blowing guide rod advances in the inner diameter of the steel pipe 8 and is resisted, the axial force of the steel pipe 8 acts on the lower pressing plate 5, and the axial force of the lower pressing plate 5 acts on the outer surface of the steel pipe 8 through the first piston cylinder 2. The axial force of the steel pipe 8 is converted through the lower pressing plate 5, so that the direction of the moment is converted into the axial direction of the first piston cylinder 2, thereby avoiding the bending of the shaft of the first piston cylinder 2. After the device is installed and used, the bending of the piston rod is avoided, the problems such as temporary shutdown for maintenance and replacement of accessories are avoided, the production efficiency is improved, and the maintenance cost is saved.

[0028] The frame 1 is provided with a lifting frame 6 which is slidably arranged on the frame 1, and one side of the lifting frame 6 is provided with a second piston cylinder 7, and the movable end of the second piston cylinder 7 is rotatably connected to the frame 1. The first piston cylinder 2 is installed on the lifting frame 6, and the middle part of the lower pressing plate 5 is rotatably connected to the lifting frame 6 through the second connecting shaft 4. The second piston cylinder 7 can push the lifting frame 6 to rise or fall relative to the frame 1, so as to adapt to the use of different specifications of steel pipes 8, thereby improving the universality of the device.

[0029] The lower pressing plate 5 includes a rocker arm 51, a connecting rod 52 and a tooth plate 53. One end of the rocker arm 51 is rotatably connected to the movable end of the first piston cylinder 2 through the first connecting shaft 3, and the other end of the rocker arm 51 is fixedly sleeved to the second connecting shaft 4. The second connecting shaft 4 is rotatably sleeved to the lifting frame 6 through an axle seat, and a ball bearing is arranged in the axle seat. One end of the connecting rod 52 is fixedly sleeved to the second connecting shaft 4, and the other end of the connecting rod 52 is provided with the tooth plate 53. The lower end of the tooth plate 53 can abut to the periphery of the steel pipe 8. The lower end of the tooth plate 53 is provided with a V-shaped notch 54, and the material of the tooth plate 53 is Q420 low-carbon alloy steel. The movable end of the first piston cylinder 2 can push the rocker arm 51 to displace after elongation. According to the principle of lever, the connecting plate and the tooth plate 53 are driven to rotate along the axis of the second connecting shaft 4, and the V-shaped notch 54 is tightly pressed on one end of the periphery of the steel pipe 8. With the issuance of the galvanized steel pipe 8 blowing program instruction, the galvanized steel pipe 8 is blown by superheated steam. The temperature of the superheated steam in the embodiment is 400~420℃, and the pressure is 0.8~1.2MPa.

[0030] At least two rocker arms 51 are arranged on the second connecting shaft 4, and each rocker arm 51 is provided with a first piston cylinder 2, a plurality of connecting rods 52 are arranged on the second connecting shaft 4, and each connecting rod 52 is provided with a toothed plate 53, as shown in Figure 3 and Figure 4 two rocker arms 51 and two connecting rods 52 are arranged on the second connecting shaft 4, and the two rocker arms 51 are arranged at two ends of the second connecting shaft 4, and the two connecting rods 52 are arranged between the two rocker arms 51.

[0031] A pipe end support 91 is arranged on the lower support 9, the pipe end support 91 is provided with a positioning opening 92, the outer periphery of the pipe end of the steel pipe 8 is located in the positioning opening 92, and each slot 54 corresponds to a positioning opening 92, that is, the end of the steel pipe 8 adopts a double-pressing structure form, and the purpose is to effectively disperse the rebound force caused by wiping the zinc bumps and residual zinc in the inner diameter of the guide rod, and effectively avoid the problem of micro-bending of the piston rod caused by stress.

[0032] As shown in Figure 1 , the toothed plate 53 rotates downward by 65-75 degrees, and is pressed against the steel pipe 8 after rotating by an angle less than 80 degrees, so as to ensure that the piston rod is pressed against the zinc-plated steel pipe 8 under the thrust of the first piston cylinder 2, and the positioning opening 92 and the slot 54 of the lower toothed plate 53 act on each other to wipe off the zinc bumps on the inner diameter of the zinc-plated steel pipe 8: At this time, the zinc bumps and zinc protrusions in the inner diameter of the zinc-plated steel pipe 8 often cause the inner blowing guide rod to not move smoothly in the inner diameter of the zinc-plated steel pipe 8 to complete the processing of the inner surface of the zinc-plated steel pipe 8; when the inner blowing guide rod is resisted by the zinc bumps in the inner diameter of the steel pipe 8, at this time, the resistance is about 0.8-1.OMPa, which acts on the toothed plate 53, and the force acting on the toothed plate 53 is converted through the Z-shaped structure, which is converted into the axial force of the first piston cylinder 2, avoiding the reverse force acting directly on the piston rod of the piston cylinder in the background art, so as to avoid the problem of bending of the piston rod caused by stress.

[0033] The above only describes preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A press-in device for hot-dip galvanized steel tube inner blowing, characterized in that: The utility model provides a kind of hydraulic press, including rack (1), first piston cylinder (2), first connecting shaft (3), second connecting shaft (4), lower pressing plate (5) and lower support (9), lower support (9) is installed to one side of rack (1), first piston cylinder (2) is provided on rack (1), and the movable end of first piston cylinder (2) is rotatably connected to one end of lower pressing plate (5) by first connecting shaft (3), lower pressing plate (5) is rotatably connected to rack (1) by second connecting shaft (4), steel pipe (8) is provided on lower support (9), and the other end of lower pressing plate (5) can abut to the periphery of steel pipe (8).

2. A compacting device for hot-dip galvanized steel pipe internal blowing according to claim 1, characterized in that: Lifting frame (6) is slidably arranged on rack (1), and second piston cylinder (7) is provided on one side of lifting frame (6), and the movable end of second piston cylinder (7) is rotatably connected to rack (1), first piston cylinder (2) is installed to lifting frame (6), and the middle part of lower pressing plate (5) is rotatably connected to lifting frame (6) by second connecting shaft (4).

3. A compacting device for hot-dip galvanized steel pipe internal blowing according to claim 1, characterized in that: The cross section of lower pressing plate (5) is Z-shaped structure.

4. A compacting device for hot-dip galvanized steel pipe internal blowing according to claim 2, characterized in that: Lower pressing plate (5) includes rocker arm (51), connecting rod (52) and toothed plate (53), one end of rocker arm (51) is rotatably connected to the movable end of first piston cylinder (2) by first connecting shaft (3), the other end of rocker arm (51) is fixedly sleeved to second connecting shaft (4), second connecting shaft (4) is rotatably sleeved to lifting frame (6) by shaft seat, one end of connecting rod (52) is fixedly sleeved to second connecting shaft (4), the other end of connecting rod (52) is installed toothed plate (53), and the lower end of toothed plate (53) can abut to the periphery of steel pipe (8).

5. A press device for hot-dip galvanized steel pipe inner blowing according to claim 4, characterized in that: The lower end of toothed plate (53) is provided with V-shaped notch (54).

6. A compacting device for hot-dip galvanized steel pipe internal blowing according to claim 4, characterized in that: Second connecting shaft (4) is provided with at least two rocker arms (51), and each rocker arm (51) is provided with a first piston cylinder (2).

7. A compacting device for hot-dip galvanized steel pipe internal blowing according to claim 4, characterized in that: Second connecting shaft (4) is installed with a plurality of connecting rods (52), and each connecting rod (52) is installed with a toothed plate (53).

8. A compacting device for hot-dip galvanized steel pipe internal blowing according to claim 5, characterized in that: Pipe end rack (91) is provided on lower support (9), and positioning opening (92) is provided on pipe end rack (91), the pipe end periphery of steel pipe (8) is located in positioning opening (92), and each notch (54) corresponds to a positioning opening (92).

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