Structure for prolonging necking service life of necking die

Abstract

The utility model discloses a structure for prolonging the necking service life of a necking die, which relates to the technical field of steel pipe manufacturing and comprises the necking die mounted on a mounting seat through a connecting seat, a cooling cavity is arranged on the inner side of the necking die, and a water inlet pipe fixedly communicated with the cooling cavity penetrates through the connecting seat. A plurality of cooling channels are evenly distributed on the end face, away from the mounting base, of the necking die and communicate with the cooling cavity, the cooling cavity is formed in the inner side of the necking die, the cooling channels communicating with the cooling cavity are formed in the necking end face of the necking die, and therefore external cooling water can be pumped into the cooling cavity from the water inlet pipe through a water pump; the cooling cavity is arranged in the cooling cavity to cool the interior of the necking die, meanwhile, cooling water in the cooling cavity cools the surface of the necking die through the cooling channel, the necking temperature is effectively reduced, the service life of the die is prolonged, the hardness of H13 die steel is improved in the water cooling process, and thermal abrasion is reduced. And meanwhile, no additional working procedure is added, and the implementation cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe manufacturing, in particular to a structure for improving the necking life of a necking die. Background Art

[0002] As an inherent process of the CPE unit, the shrinking process is used to fix the core rod head and the rough pipe to ensure that the rough pipe is tightly combined with the core rod and the jacking frame when it is deformed by the jacking pipe.

[0003] The main problem at present is that the shrinking position wears quickly. When the shrinking number reaches 20,000, it starts to wear abnormally, resulting in the inability of the rough pipe head to be tightly combined with the core rod head, and there is a wear gap in the middle. When jacking the pipe, the core rod passes through the gap, causing punching, and the rough pipe is stuck in the frame, which is a very serious production accident. Therefore, during production, the shrinking die needs to be replaced frequently, which affects the production quality and production efficiency. Therefore, a structure that increases the shrinking life of the shrinking die is proposed to improve the above problems. Utility Model Content

[0004] The purpose of the present application is to provide a structure for improving the necking life of a necking die, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a structure for improving the necking life of a necking die, comprising a necking die mounted on a mounting seat via a connecting seat:

[0006] A cooling cavity is arranged inside the shrinking die, and a water inlet pipe fixedly connected to the cooling cavity runs through the connecting seat;

[0007] A plurality of cooling channels are evenly distributed on the end surface of the shrinking die away from the mounting seat, and the plurality of cooling channels are all connected with the cooling cavity.

[0008] As a further supplement to the present solution, a plurality of water return channels are distributed on the end surface of the shrinking die close to the mounting seat, and the plurality of water return channels are all connected to the cooling cavity.

[0009] As a further supplement to this solution, an on-off valve is installed on the inner side of the return water channel, and the on-off valve is fixed to the inner wall of the return water channel by a torsion spring;

[0010] Before the shrinking operation, the pressure of the cooling water entering the cooling chamber on the on-off valve is less than the elastic force of the torsion spring, which is insufficient to open the on-off valve. The cooling water in the cooling chamber flows out from the cooling channel to cool the inside and outside of the shrinking mold at the same time.

[0011] During the shrinking operation, the cooling channel is covered by the capillary tube, and the cooling water in the cooling cavity cannot flow out of the cooling channel, causing the water pressure in the cooling cavity to increase to a level greater than the elastic force of the torsion spring. The on-off valve opens, and the cooling water flows out of the return water channel.

[0012] As a further supplement to the present solution, a water storage cavity is provided on the inner side of the connecting seat, and a water pipe connected to the water storage cavity is installed on the connecting seat.

[0013] As a further supplement to the present solution, a water storage cavity is provided inside the connecting seat, an elastic membrane is provided inside the water storage cavity, the four sides of the elastic membrane are fixed to the surface of the shrinking die, and the elastic membrane covers all the return water channels;

[0014] During the shrinking operation, the cooling channel is covered by the capillary tube, and the cooling water in the cooling cavity cannot flow out of the cooling channel, causing the water pressure in the cooling cavity to increase to a level greater than the elastic force of the torsion spring. The on-off valve opens, and the cooling water flows from the return water channel to the elastic membrane, which expands and stores water.

[0015] After the shrinking operation is completed, the cooling channel is opened, and the elastic membrane squeezes the cooling water inside it under its own elastic action, so that the on-off valve reversely squeezes the torsion spring until the on-off valve is reversely opened, and the cooling water cools the surface of the shrinking mold again through the cooling channel.

[0016] In summary, the technical effects and advantages of the utility model are:

[0017] 1. In the utility model, a cooling cavity is arranged on the inner side of the shrinking die, and a cooling channel connected to the cooling cavity is arranged on the shrinking end face of the shrinking die. A water pump can be used to pump external cooling water from a water inlet pipe into the cooling cavity to cool the inside of the shrinking die. At the same time, the cooling water in the cooling cavity cools the surface of the shrinking die through the cooling channel, which effectively reduces the shrinking temperature and improves the life of the die. The water cooling process improves the hardness of the H13 die steel and reduces thermal wear. At the same time, no additional process is added, so the cost is low.

[0018] 2. In the utility model, through the arrangement of the return water channel, the on-off valve and the elastic membrane, during the shrinking operation, the cooling channel is covered by the capillary tube, and the cooling water in the cooling cavity cannot flow out of the cooling channel, causing the water pressure in the cooling cavity to increase to a level greater than the elastic force of the torsion spring. The on-off valve opens, and the cooling water flows from the return water channel to the elastic membrane, and the elastic membrane expands to store water. After the shrinking operation is completed, the cooling channel is turned on, and the elastic membrane squeezes the cooling water inside it under its own elastic action, so that the on-off valve reversely squeezes the torsion spring until the on-off valve is reversely turned on, and the cooling water cools the surface of the shrinking mold again through the cooling channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the overall three-dimensional structure of this embodiment;

[0021] Figure 2 Schematic diagram of the cross-section structure of the necking die in this embodiment;

[0022] Figure 3 It is a schematic diagram of the front structure in this embodiment;

[0023] Figure 4 This is a demonstration diagram of the shrinking operation process in this embodiment;

[0024] Figure 5 This is a demonstration diagram after the necking operation is completed in this embodiment.

[0025] In the figure: 1. Mounting seat; 2. Connecting seat; 3. Narrowing die; 4. Water inlet pipe; 5. Cooling chamber; 6. Cooling channel; 7. Return water channel; 8. On-off valve; 9. Water storage chamber; 10. Elastic membrane. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example: Reference Figure 1-5 A structure for improving the shrinking life of a shrinking mold is shown, comprising a shrinking mold 3 installed on a mounting seat 1 through a connecting seat 2, a cooling cavity 5 is arranged on the inner side of the shrinking mold 3, a water inlet pipe 4 fixedly connected to the cooling cavity 5 passes through the connecting seat 2, and a plurality of cooling channels 6 are evenly distributed on the end surface of the shrinking mold 3 away from the mounting seat 1, and the plurality of cooling channels 6 are all connected to the cooling cavity 5.

[0028] Based on the coordinated arrangement of the above structure, a water pump can be used to pump external cooling water from the water inlet pipe 4 into the cooling chamber 5 to cool the interior of the necking mold 3. At the same time, the cooling water in the cooling chamber 5 cools the surface of the necking mold 3 through the cooling channel 6, which effectively reduces the necking temperature and increases the life of the mold. The water cooling process increases the hardness of the H13 mold steel and reduces thermal wear. At the same time, no additional processes are added, and the cost is relatively low.

[0029] Among them, a plurality of return water channels 7 are distributed on the end face of the shrinking die 3 close to the mounting seat 1, and the plurality of return water channels 7 are all connected with the cooling chamber 5. During the shrinking operation, the cooling channel 6 is covered by the capillary tube, and the cooling water in the cooling chamber 5 flows out from the return water channel 7 to avoid excessive water pressure in the cooling channel 6 affecting the shrinking quality.

[0030] Among them, an on-off valve 8 is installed on the inner side of the return water channel 7, and the on-off valve 8 is fixed to the inner wall of the return water channel 7 by a torsion spring;

[0031] Before the shrinking operation, the pressure of the cooling water entering the cooling chamber 5 on the on-off valve 8 is less than the elastic force of the torsion spring, which is insufficient to open the on-off valve 8. The cooling water in the cooling chamber 5 flows out from the cooling channel 6 to cool the inside and outside of the shrinking mold 3 at the same time.

[0032] During the shrinking operation, the cooling channel 6 is covered by the capillary tube, and the cooling water in the cooling chamber 5 cannot flow out of the cooling channel 6, causing the water pressure in the cooling chamber 5 to increase to a level greater than the elastic force of the torsion spring, the on-off valve 8 opens, and the cooling water flows out from the return water channel 7.

[0033] As one of the embodiments, a water storage chamber 9 is provided on the inner side of the connecting seat 2, and a water pipe (not shown in the figure) connected to the water storage chamber 9 is installed on the connecting seat 2. The water storage chamber 9 is used to uniformly collect the cooling water flowing out of the return water channel 7 and return it to the external water tank through the water pipe to achieve recycling and reduce water waste.

[0034] As another embodiment, a water storage cavity 9 is provided inside the connection seat 2, and an elastic membrane 10 is provided inside the water storage cavity 9. The elastic membrane 10 is fixed to the surface of the shrinking mold 3 around the periphery, and the elastic membrane 10 covers all the return water channels 7;

[0035] During the shrinking operation, the cooling channel 6 is covered by the capillary tube, and the cooling water in the cooling cavity 5 cannot flow out of the cooling channel 6, causing the water pressure in the cooling cavity 5 to increase to a level greater than the elastic force of the torsion spring. The on-off valve 8 opens, and the cooling water flows from the return water channel 7 to the elastic membrane 10. Figure 4 It is shown that the elastic membrane 10 expands and stores water;

[0036] After the shrinking operation is completed, the cooling channel 6 is opened, and the elastic membrane 10 squeezes the cooling water inside it under its own elastic action, so that the on-off valve 8 reversely squeezes the torsion spring until the on-off valve 8 is reversely opened. Figure 5 It is shown that the cooling water cools the surface of the shrinking mold 3 again through the cooling channel 6.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A structure for improving the necking life of a necking die, comprising a necking die (3) mounted on a mounting seat (1) via a connecting seat (2), characterized in that: A cooling cavity (5) is provided on the inner side of the shrinking die (3), and a water inlet pipe (4) which is fixedly connected to the cooling cavity (5) passes through the connecting seat (2); A plurality of cooling channels (6) are evenly distributed on the end surface of the shrinking die (3) away from the mounting seat (1), and the plurality of cooling channels (6) are all connected to the cooling cavity (5).

2. A structure for improving the necking life of a necking die according to claim 1, characterized in that: A plurality of water return channels (7) are distributed on the end surface of the shrinking die (3) close to the mounting seat (1), and the plurality of water return channels (7) are all connected to the cooling cavity (5).

3. The structure for improving the necking life of a necking die according to claim 2, characterized in that: An on-off valve (8) is installed on the inner side of the return water channel (7), and the on-off valve (8) is fixed to the inner wall of the return water channel (7) via a torsion spring; Before the shrinking operation, the pressure of the cooling water entering the cooling chamber (5) on the on-off valve (8) is less than the elastic force of the torsion spring and is insufficient to open the on-off valve (8). The cooling water in the cooling chamber (5) flows out from the cooling channel (6) to cool the inside and outside of the shrinking mold (3) simultaneously. During the shrinking operation, the cooling channel (6) is covered by the capillary tube, and the cooling water in the cooling cavity (5) cannot flow out of the cooling channel (6), causing the water pressure in the cooling cavity (5) to increase to a level greater than the elastic force of the torsion spring, and the on-off valve (8) opens, allowing the cooling water to flow out of the return water channel (7).

4. The structure for improving the necking life of a necking die according to claim 3, characterized in that: A water storage chamber (9) is provided on the inner side of the connection seat (2), and a water conduit communicating with the water storage chamber (9) is installed on the connection seat (2).

5. The structure for improving the necking life of a necking die according to claim 3, characterized in that: A water storage cavity (9) is provided on the inner side of the connecting seat (2), an elastic membrane (10) is provided on the inner side of the water storage cavity (9), the four sides of the elastic membrane (10) are fixed to the surface of the shrinking mold (3), and the elastic membrane (10) covers all the return water channels (7); During the shrinking operation, the cooling channel (6) is covered by the capillary tube, and the cooling water in the cooling cavity (5) cannot flow out of the cooling channel (6), causing the water pressure in the cooling cavity (5) to increase to a level greater than the elastic force of the torsion spring, the on-off valve (8) opens, and the cooling water flows from the return water channel (7) to the elastic membrane (10), and the elastic membrane (10) expands to store water; After the shrinking operation is completed, the cooling channel (6) is opened, and the elastic membrane (10) squeezes the cooling water inside it under the action of its own elasticity, so that the on-off valve (8) reversely squeezes the torsion spring until the on-off valve (8) is reversely opened, and the cooling water cools the surface of the shrinking mold (3) again through the cooling channel (6).

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