Two-section drawing die and tool for drawing manifold

Abstract

The utility model provides a two-section type drawing die for drawing a manifold, which comprises an upper drawing die and a lower drawing die which are coaxially arranged, the middle shaft of the upper drawing die and the middle shaft of the lower drawing die are connected through a threaded connector, and a drawing tool comprises a supporting structure, a pressing structure, a hydraulic structure, a heating structure and the two-section type drawing die, the supporting structure supports the drawing manifold, the pressing structure presses the drawing manifold, the hydraulic structure drives the two-section type drawing die, and the heating structure sprays high-temperature flames to an area to be drawn for continuous heating. According to the utility model, the two-section drawing die is designed for drawing the pipe orifice of the manifold made of high-strength pipeline steel, so that the pipe orifice can be effectively prevented from being hardened and cracked in the heating and drawing process; appropriate supporting, pressing, hydraulic and heating structures are adopted to be matched with the two-section type drawing die, so that placing, fixing, die connecting and heating drawing of the manifold can be carried out safely and effectively, and continuous and stable heating is also an important condition for successful two-section type drawing.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe drawing, in particular to a two-stage drawing die and tooling for drawing header pipes. Background Art

[0002] The main functions of the gas collecting pipe of the gas gate station are to collect, buffer, and distribute the gas flow:

[0003] 1. Pre-store the gas to prevent excessive pressure drop at the end gas-using point and ensure normal demand; 2. Buffer and balance the incoming gas pressure and flow from all parties, and then transport to the lower-end equipment after the parameters are stable; 3. When there are too many pipeline branches, stabilize the branch pipelines and balance the pressure and flow in each pipeline.

[0004] The common pipe orifice forming methods of the header pipe are welding forming and drawing forming. The drawn header pipe is also called a drawn header pipe. Compared with the welded header pipe, the structural characteristics of the drawn header pipe are: opening drawing, with a large local arc transition at the opening, which makes the drawn header pipe have the advantages of low stress, small pressure loss when the gas passes through, and low noise.

[0005] In the prior art, low-alloy steel with high toughness is mainly used as the main material for the drawn header pipe. Low-alloy steel can better extend during the heating and drawing process and is not easy to crack. However, with the development of steel smelting technology and pipe manufacturing technology, with the improvement of natural gas transportation requirements and the complexity of the pipeline service environment, natural gas transportation pipelines are increasingly inclined to use high steel grades, prepare large diameters, and adopt high-pressure rich gas transportation processes. Although high-strength pipeline steel can be thinned according to the high design thickness and is used as the main raw material for the drawn header pipe with its economic advantages, it has the characteristics of high yield strength and high tensile strength, which makes it easy to harden and crack during the heating and drawing process, resulting in drawing failure.

[0006] Therefore, it is necessary to improve the prior art. Summary of the Utility Model

[0007] The utility model provides a two-stage drawing die and tooling for drawing header pipes to solve the above problems.

[0008] One technical solution adopted by the utility model is: to provide a two-stage drawing die for drawing header pipes, including: an upper drawing die and a lower drawing die. The upper drawing die is located above the lower drawing die, and the two are coaxially arranged. A threaded connector is provided at the central axis, and the threaded connector is threadedly connected to the upper drawing die and the lower drawing die. During the drawing process, two-stage forming is performed on the pipe orifice opening to form a large arc transition. In addition, the upper drawing die and the lower drawing die can be used separately after being disassembled.

[0009] Furthermore, both the upper drawing die and the lower drawing die have a drawing section and a transition section. The drawing section has an arc-shaped surface with a diameter increasing from small to large, which acts on the opening of the pipe orifice during the drawing process to make the opening turn outwards and extend to form an arc transition. The transition section has an outer peripheral surface with a consistent diameter, which is connected to the maximum diameter of the drawing section to keep the arc transition already formed at the opening.

[0010] Furthermore, the ratio of the maximum diameter of the upper drawing die to the maximum diameter of the lower drawing die is 2:3, which can more effectively complete the two-stage drawing and avoid hardening and cracking of the pipe orifice during the heating drawing process.

[0011] Another technical solution adopted by the present utility model is to provide a two-stage drawing tooling for a drawing header, including: a support structure, a pressing structure, a hydraulic structure, a heating structure, and the above two-stage drawing die;

[0012] The support structure includes a pair of tracks and at least two support seats. The support seats are slidably arranged on the tracks and are used to support the drawing header;

[0013] There are two pressing structures, which are symmetrically arranged on both sides of the area to be drawn and are used to press the drawing header;

[0014] The hydraulic structure includes a hydraulic press and a connecting piece. The hydraulic press is arranged above the area to be drawn, and its driving end faces downward. The connecting piece is arranged at the driving end of the hydraulic press and has a threaded connection port, and the threaded connection port is used to connect the threaded connector of the two-stage drawing die;

[0015] The heating structure includes an annular pipe rack and a plurality of burner nozzles. The annular pipe rack is arranged above the area to be drawn, and the plurality of burner nozzles are distributed on the annular pipe rack and the spraying directions point to the area to be drawn, and continuously spray fire for heating during the drawing process;

[0016] During operation, the header made of high-strength pipeline steel is placed on the support structure. The pre-opening of the pipe orifice is adjusted below the connecting piece. The pressing structure presses the header. The two-stage drawing die is connected to the connecting piece. The heating structure is started, and the burner nozzles spray flames at 900 °C for continuous heating. The two-stage drawing die moves upward to perform two-stage drawing on the header, and finally a large arc transition is formed at the opening of the pipe orifice.

[0017] Furthermore, the pressing structure includes a fixed frame, a pressing cylinder, and a pressing block. The fixed frame spans across the tracks. The pressing cylinder is located at the top of the fixed frame, and its driving end faces downward. The pressing block is arranged at the driving end of the pressing cylinder and is used to press the drawing header.

[0018] Furthermore, both the pressing block and the support seat have arc contact surfaces to facilitate fitting with the drawing header, and a buffer layer is also arranged on the arc contact surface to avoid damaging the header.

[0019] Furthermore, a gas fuel channel is provided inside the annular pipe rack, and the gas fuel channel is communicated with each burner nozzle. One side of the annular pipe rack is connected to a gas supply device through an intake pipe, integrating independent burners into the annular pipe rack to simplify the structure.

[0020] Furthermore, the annular pipe rack is liftable and applicable to header pipes of different diameters.

[0021] Furthermore, the burner nozzle is one of a gas burner nozzle and a fuel burner nozzle.

[0022] The beneficial effects of the two-stage drawing die and tooling for drawing header pipes of the present utility model are as follows:

[0023] 1. By designing a two-stage drawing die to draw the pipe orifice of a header pipe made of high-strength pipeline steel, it can effectively avoid hardening and cracking of the pipe orifice during the hot drawing process.

[0024] 2. By adopting appropriate support, pressing, hydraulic, and heating structures and cooperating with the two-stage drawing die, the placement, fixation, die connection, and hot drawing of the header pipe can be carried out safely and effectively. Continuous and stable heating is also an important condition for the success of two-stage drawing. Description of the Drawings

[0025] Figure 1 is the front view of the two-stage drawing tooling for a header pipe in the first embodiment of the present utility model;

[0026] Figure 2 is the top view of the two-stage drawing tooling for a header pipe in the first embodiment of the present utility model;

[0027] Figure 3 is the schematic diagram of the first-stage drawing in the first embodiment of the present utility model;

[0028] Figure 4 is the schematic diagram of the second-stage drawing in the first embodiment of the present utility model;

[0029] Figure 5 is the connection schematic diagram of the two-stage drawing die in the first embodiment of the present utility model;

[0030] Figure 6 is the design schematic diagram of the annular pipe rack in the first embodiment of the present utility model;

[0031] The labels of each component in the drawings are as follows: 1. Rail, 2. Support seat, 3. Pressing cylinder, 4. Pressing block, 5. Hydraulic press, 6. Connector, 7. Annular pipe rack, 8. Burner nozzle, 9. Upper drawing die, 10. Lower drawing die, 11. Threaded connector, 12. Header pipe. Detailed Description of the Preferred Embodiments

[0032] The following elaborates on the preferred embodiments of the present utility model in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", "horizontal", "vertical", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These are only for the convenience of describing the present utility model and cannot indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0034] Please refer to Figure 5 , the first embodiment of the present utility model provides a two-stage drawing die for a drawing header, including: an upper drawing die 9 and a lower drawing die 10;

[0035] The upper drawing die 9 is located above the lower drawing die 10, and the two are coaxially arranged. A threaded connector 11 is provided at the central axis. The threaded connector 11 has an external thread, and the central axis holes of the upper drawing die 9 and the lower drawing die 10 have internal threads, so that the threaded connector 11 can be threadedly connected to the upper drawing die 9 and the lower drawing die 10;

[0036] During the drawing process, the upper drawing die 9 and the lower drawing die 10 sequentially perform drawing and forming on the opening of the pipe orifice, and a large arc transition is formed through two-stage drawing and forming;

[0037] The two-stage drawing die is detachable. After removing the threaded connector 11, the upper drawing die 9 and the lower drawing die 10 can be used separately.

[0038] Specifically, after the threaded connector 11 is connected to the upper and lower drawing dies 10, its upper end still extends out of the die and is used to connect to the hydraulic structure of the two-stage drawing tooling.

[0039] The upper drawing die 9 and the lower drawing die 10 have the same shape. The upper drawing die 9 is smaller than the lower drawing die 10, and both have a drawing section and a transition section;

[0040] The upper section is the drawing section, which has an arc-shaped surface with a diameter increasing from small to large. During the drawing process, it acts on the opening of the pipe orifice to make the opening turn outwards and extend to form an arc transition. The lower section is the transition section, which has an outer peripheral surface with a consistent diameter and is connected to the largest diameter of the drawing section to keep the arc transition already formed at the opening.

[0041] Specifically, the ratio of the largest diameter of the upper drawing die 9 to the largest diameter of the lower drawing die 10 is 2:3, which can more effectively complete two-stage drawing and avoid hardening and cracking of the pipe orifice during hot drawing.

[0042] Please refer to Figures 1 to 6 , the first embodiment of the present utility model provides a two-stage drawing tooling for a drawing header, including: a support structure, a pressing structure, a hydraulic structure, a heating structure, and the above two-stage drawing die;

[0043] The support structure includes a pair of rails 1 and at least two support seats 2. Each support seat 2 is slidably arranged on the rail 1 and is used to support the drawing header. By moving the position of the support seat 2 or increasing the number of support seats 2, headers of different lengths can be adapted;

[0044] There are two pressing structures, symmetrically arranged on both sides of the area to be drawn, including a fixed frame, a pressing cylinder 3, and a pressing block 4. The fixed frame is arranged across the rail 1. The pressing cylinder 3 is located at the top of the fixed frame, with its driving end facing downwards. The pressing block 4 is arranged at the driving end of the pressing cylinder 3 and is used to press the drawing header;

[0045] The hydraulic structure includes a hydraulic press 5 and a connecting piece 6. The hydraulic press 5 is arranged above the area to be drawn, with its driving end facing downwards. The connecting piece 6 is arranged at the driving end of the hydraulic press 5 and has a threaded connection port, which is used to connect the threaded connector 11 of the two-stage drawing die;

[0046] The heating structure includes an annular pipe rack 7 and a plurality of burner nozzles 8. The annular pipe rack 7 is arranged above the area to be drawn. Ten burner nozzles 8 are distributed on the annular pipe rack 7 and their spraying directions point to the area to be drawn, and continuously spray fire for heating during the drawing process;

[0047] During operation, the header made of high-strength pipeline steel is placed on the support structure. The pre-opening of the pipe orifice is adjusted below the connecting piece 6. The pressing structure presses the header. The two-stage drawing die is connected to the connecting piece 6. The heating structure is started, and the burner nozzles 8 spray flames at 900 °C for continuous heating. The two-stage drawing die moves upward to perform two-stage drawing on the header, and finally a large arc transition is formed at the orifice opening of the pipe;

[0048] Specifically, a locking mechanism is further arranged on the support seat 2 to lock it on the rail 1.

[0049] Specifically, the fixed frame can be integrated with the frame of the hydraulic press 5 to form an integral tooling frame.

[0050] Both the pressing block 4 and the support seat 2 have arc contact surfaces to facilitate fitting with the drawing header, and a buffer layer is further arranged on the arc contact surface to prevent damage to the header.

[0051] Specifically, a distance sensor is further arranged on the side of the pressing block 4 to determine the distance between the pressing block 4 and the header.

[0052] The annular pipe support 7 is connected to the frame of the hydraulic press 5 or the tooling frame through a lifting frame. When the diameters of the header pipes are different, the height of the annular pipe support 7 can be adjusted through the lifting frame to ensure a reasonable distance between the nozzles and the drawing area. In addition, the annular pipe support 7 is detachable, and annular pipe supports 7 of different specifications can be replaced.

[0053] Specifically, the annular pipe support 7 has a gas fuel channel inside. The gas fuel channel is communicated with each burner nozzle 8. One side of the annular pipe support 7 is connected to the gas supply equipment through an air inlet pipe, and the independent burners are integrated into the annular pipe support 7 to simplify the structure.

[0054] Specifically, the burner nozzle 8 is a gas burner nozzle 8, which uses natural gas, propane or other combustible gases as fuel and can generate a high-temperature flame of 900 degrees Celsius. Or a fuel burner nozzle 8 can also be used. The fuel burner nozzle 8 uses liquid fuel (such as diesel or heavy oil) instead of gas fuel, but the disadvantage is that the structure is more complex and the cost is higher.

[0055] The beneficial effects of the two-stage drawing die and tooling for drawing headers of the present utility model are as follows:

[0056] 1. By designing a two-stage drawing die to draw the pipe orifice of the header made of high-strength pipeline steel, it can effectively avoid hardening and cracking of the pipe orifice during the heating and drawing process.

[0057] 2. By adopting appropriate support, clamping, hydraulic and heating structures and cooperating with the two-stage drawing die, the placement, fixation, die connection and heating and drawing of the header can be carried out safely and effectively. Continuous and stable heating is also an important condition for the success of the two-stage drawing.

[0058] The above are only the embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A two-stage drawing die for a drawing header, characterized in that, Comprising: An upper drawing die and a lower drawing die, the upper drawing die is located above the lower drawing die, and the two are coaxially arranged. A threaded connector is provided at the central axis, and the threaded connector is threadedly connected to the upper drawing die and the lower drawing die. During the drawing process, two-stage forming is performed on the opening of the pipe end to form a large arc transition.

2. The two-stage drawing die for a drawing header according to claim 1, characterized in that, Both the upper drawing die and the lower drawing die have a drawing section and a transition section. The drawing section has an arc-shaped surface with a diameter increasing from small to large, and the transition section has an outer peripheral surface with a consistent diameter, which is connected to the maximum diameter of the drawing section.

3. The two-stage drawing die for a drawing header according to claim 2, characterized in that, The ratio of the maximum diameter of the upper drawing die to the maximum diameter of the lower drawing die is 2:

3.

4. A two-stage drawing tooling for a drawing header, characterized in that Comprising: A support structure, a pressing structure, a hydraulic structure, a heating structure, and the two-stage drawing die according to any one of claims 1-3; The support structure includes a pair of rails and at least two support seats. The support seats are slidably arranged on the rails and are used to support the drawing header. There are two pressing structures, symmetrically arranged on both sides of the area to be drawn, and are used to press the drawing header. The hydraulic structure includes a hydraulic press and a connecting member. The hydraulic press is arranged above the area to be drawn, and its driving end faces downward. The connecting member is arranged at the driving end of the hydraulic press and has a threaded connection port, and the threaded connection port is used to connect the threaded connector of the two-stage drawing die; the heating structure includes an annular pipe rack and a plurality of burner nozzles. The annular pipe rack is arranged above the area to be drawn, and a plurality of the burner nozzles are distributed on the annular pipe rack and the spraying direction points to the area to be drawn.

5. The two-stage drawing tooling for a drawing header according to claim 4, characterized in that, The pressing structure includes a fixed frame, a pressing cylinder, and a pressing block. The fixed frame is arranged across the rails, the pressing cylinder is located at the top of the fixed frame, and the driving end faces downward. The pressing block is arranged at the driving end of the pressing cylinder and is used to press the drawing header.

6. The two-stage drawing tooling for a drawing header according to claim 5, characterized in that, Both the pressing block and the support seat have an arc contact surface.

7. The two-stage drawing tooling for a drawing header according to claim 6, characterized in that, A buffer layer is further arranged on the arc contact surface.

8. A two-stage drawing tooling for drawing header pipes according to any one of claims 4-7, characterized in that, The annular pipe rack has a gas fuel passage inside, and the gas fuel passage is communicated with each burner nozzle. One side of the annular pipe rack is connected to a gas supply device through an intake pipe.

9. The two-stage drawing tooling for drawing header pipes according to claim 8, characterized in that, The annular pipe rack is liftable.

10. The two-stage drawing tooling for drawing header pipes according to claim 8, characterized in that, The burner nozzle is one of a gas burner nozzle and a fuel burner nozzle.

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