Molybdenum plug quick adapter

Abstract

The utility model relates to the technical field of adapters, and discloses a molybdenum plug quick adapter which comprises a connecting mechanism, a main body mechanism is arranged at the top of the connecting mechanism, and limiting mechanisms are arranged on the two sides of the main body mechanism. On one hand, cooling water between the molybdenum plug and the ejector rod is effectively isolated, the molybdenum plug is prevented from cracking when encountering water, on the other hand, according to the structural characteristics of a common ejector rod, the conical insertion structure is designed, the threaded connection section of the molybdenum plug and the adapter is inserted into the plug, the total length of the molybdenum plug and the adapter is shortened, and the service life of the molybdenum plug is prolonged. On the basis that the structural design of an existing ejector rod is not changed, on-line rapid replacement of the molybdenum top heads can be achieved, it is guaranteed that each molybdenum top head can be fully cooled by increasing the number of the molybdenum top heads working on line at the same time, all the molybdenum top heads are controlled within the optimal working temperature range of 800-950 DEG C, and the service life of the molybdenum top heads is prolonged. And the existing carbon steel rolling mill equipment can be used for realizing a transformation-free large-scale production organization.

Description

Technical Field

[0001] This utility model relates to the field of conversion connector technology, and in particular to a molybdenum mandrel quick conversion connector. Background Technology

[0002] This utility model relates to a conversion joint structure between the molybdenum mandrel and the mandrel rod in the hot-rolled piercing high-alloy seamless steel pipe manufacturing process. It is particularly suitable for scenarios requiring rapid online replacement of multiple molybdenum mandrels. When manufacturing high-alloy seamless steel pipes using the hot-rolled piercing process, the selection of the rolling tool mandrel is extremely critical, directly affecting the inner surface quality of the steel pipe. The industry widely uses molybdenum mandrels for piercing and rolling high-alloy seamless steel pipes. The optimal operating temperature range for the molybdenum mandrel is 800–950℃. The molybdenum mandrel requires separate heating before entering the rolling mill, and it is prone to cracking when exposed to water at high temperatures; therefore, water cannot be poured onto the molybdenum mandrel during the rolling process. The mandrel rod used to support the mandrel is made of ordinary carbon steel and requires continuous water cooling during piercing. Therefore, a special "conversion joint" must be added between the molybdenum mandrel and the mandrel for isolation. Due to the relatively long total length of the "molybdenum mandrel + mandrel front end piece," it is impossible to achieve large-scale production without modification using existing equipment. In ordinary hot-rolled seamless steel pipe enterprises, molybdenum mandrels are typically connected using "double-threaded conversion joints." After piercing and rolling, the tightening force of the conversion joint's threads increases, making online replacement difficult. Therefore, generally, only a single molybdenum mandrel participates in rolling production. During piercing, the temperature of the molybdenum mandrel continuously rises along with the rolling process. When the temperature exceeds 950℃, the hardness of the molybdenum mandrel decreases, the piercing process becomes unstable, and the straightness and ovality of the rolled product deteriorate. The surface temperature of the molybdenum mandrel is also too high, and steel may stick to the mandrel surface, leading to internal bending defects in the steel pipe. When using a single molybdenum mandrel for piercing production, the discharge rhythm is usually controlled to force the molybdenum mandrel to cool naturally, ensuring that the molybdenum mandrel always operates between 800 and 950℃.

[0003] The current process control fully considers the working temperature of the molybdenum mandrel, but it deviates from the heating regime of high alloy seamless steel pipes, affecting the heating and holding time of the billet and failing to meet the requirements for continuous and stable production of high alloy seamless steel pipes. Since the length of the front end of the ordinary mandrel is relatively long, the total length of "molybdenum mandrel + front end of mandrel" is relatively long. In order to achieve online and rapid replacement of the molybdenum mandrel, the mandrel structure design needs to be changed separately, which increases the cost of production enterprises and generates additional tooling change time losses. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a quick conversion connector for a molybdenum mandrel.

[0005] This utility model is achieved by the following technical solution: a molybdenum top quick conversion connector, including a connecting mechanism, a main body mechanism is provided on the top of the connecting mechanism, and limit mechanisms are provided on both sides of the main body mechanism;

[0006] The connecting mechanism includes a first connecting ring, and a second connecting ring is fixedly connected to the top of the first connecting ring.

[0007] Preferably, the surface of the first connecting ring is provided with four through holes, which are symmetrically distributed between the first connecting ring and the second connecting ring.

[0008] Preferably, the main body includes a body, a protective block is fixedly connected to the top of the body, and a protective ring is fitted onto the surface of the body.

[0009] Preferably, there are three protective rings, and the protective rings are located on top of the second connecting ring.

[0010] Preferably, the limiting mechanism includes a first fixed shaft, a first connecting plate sleeved on the surface of the first fixed shaft, a connecting shaft sleeved on the side of the first connecting plate away from the first fixed shaft, a second connecting plate sleeved on the surface of the connecting shaft, and a second fixed shaft sleeved on the side of the second connecting plate away from the connecting shaft.

[0011] Preferably, the first fixed shaft and the second fixed shaft are fixedly connected to the second connecting ring and the protective ring, respectively.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention effectively isolates the cooling water between the molybdenum mandrel and the mandrel rod, preventing the mandrel from cracking upon contact with water. Furthermore, based on the structural characteristics of ordinary mandrel rods, a tapered insertion structure is designed, extending the threaded connection section of the molybdenum mandrel and the adapter into the mandrel's interior, thus shortening the total length of the "molybdenum mandrel + adapter joint". This invention enables rapid online replacement of the molybdenum mandrel without altering the existing mandrel rod structure. By increasing the number of molybdenum mandrels operating simultaneously, it ensures that each mandrel is adequately cooled, maintaining all mandrels within the optimal operating temperature range of 800–950°C. This allows for large-scale production organization without modification using existing carbon steel rolling mill equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the connection mechanism of this utility model;

[0016] Figure 3 This is a schematic diagram of the main structure of the present utility model;

[0017] Figure 4 This is a schematic diagram of the limiting mechanism of this utility model.

[0018] In the figure: 1. Connecting mechanism; 101. First connecting ring; 102. Second connecting ring; 2. Main body mechanism; 201. Body; 202. Protective block; 203. Protective ring; 3. Limiting mechanism; 301. First fixed shaft; 302. Connecting shaft; 303. Second fixed shaft. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Specific embodiments are given below.

[0021] Please see Figures 1-4 This embodiment of a molybdenum mandrel quick conversion connector includes a connecting mechanism 1, a main body mechanism 2 is provided on the top of the connecting mechanism 1, and limit mechanisms 3 are provided on both sides of the main body mechanism 2.

[0022] The connecting mechanism 1 includes a first connecting ring 101, and a second connecting ring 102 is fixedly connected to the top of the first connecting ring 101.

[0023] The surface of the first connecting ring 101 has four through holes, which are symmetrically distributed between the first connecting ring 101 and the second connecting ring 102.

[0024] The main body 2 includes a body 201, a protective block 202 is fixedly connected to the top of the body 201, and a protective ring 203 is sleeved on the surface of the body 201.

[0025] There are three protective rings 203, and the protective rings 203 are located on top of the second connecting ring 102.

[0026] The limiting mechanism 3 includes a first fixed shaft 301, a first connecting plate sleeved on the surface of the first fixed shaft 301, a connecting shaft 302 sleeved on the side of the first connecting plate away from the first fixed shaft 301, a second connecting plate sleeved on the surface of the connecting shaft 302, and a second fixed shaft 303 sleeved on the side of the second connecting plate away from the connecting shaft 302.

[0027] The first fixed shaft 301 and the second fixed shaft 303 are respectively fixedly connected to the second connecting ring 102 and the protective ring 203.

[0028] Working principle: When a molybdenum mandrel quick-connect adapter is needed, the adapter is connected to the equipment to be connected via the first connecting ring 101 and the second connecting ring 102 of the connecting mechanism 1. The through hole on the first connecting ring 101 can be used for bolt connection or other fastening methods to ensure the stability of the connection. During equipment operation, the limiting mechanism 3 plays a role. If the main body mechanism 2 has a tendency to shift due to vibration caused by equipment operation or external force, the first connecting plate of the limiting mechanism 3 will rotate around the first fixed shaft 301, simultaneously driving the connecting shaft 302 and the second connecting plate to move. The two connecting plates are sleeved on the second fixed shaft 303, which is fixedly connected to the protective ring 203. This structure restricts the excessive displacement of the main body mechanism 2, ensures that the main body mechanism 2 operates stably within a certain range, and prevents loosening of connections or equipment failure due to displacement of the main body mechanism 2. The protective block 202 and the protective ring 203 of the main body mechanism 2 continue to play a protective role. The protective block 202 protects the top of the machine body 201 and prevents it from being hit by objects above during equipment operation. The protective ring 203 provides all-round protection for the surface of the machine body 201, reduces damage to the machine body 201 from external factors, and extends the service life of the machine body 201.

[0029] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A quick-change adapter for a molybdenum mandrel, characterized in that: It includes a connecting mechanism, with a main body mechanism on top of the connecting mechanism and limit mechanisms on both sides of the main body mechanism; The connecting mechanism includes a first connecting ring, and a second connecting ring is fixedly connected to the top of the first connecting ring.

2. The molybdenum mandrel quick-change connector according to claim 1, characterized in that: The surface of the first connecting ring has four through holes, which are symmetrically distributed between the first connecting ring and the second connecting ring.

3. The molybdenum mandrel quick-change connector according to claim 1, characterized in that: The main structure includes a body, a protective block is fixedly connected to the top of the body, and a protective ring is fitted onto the surface of the body.

4. A quick-change adapter for a molybdenum mandrel according to claim 3, characterized in that: There are three protective rings, and the protective rings are located on top of the second connecting ring.

5. A quick-change adapter for a molybdenum mandrel according to claim 1, characterized in that: The limiting mechanism includes a first fixed shaft, a first connecting plate sleeved on the surface of the first fixed shaft, a connecting shaft sleeved on the side of the first connecting plate away from the first fixed shaft, a second connecting plate sleeved on the surface of the connecting shaft, and a second fixed shaft sleeved on the side of the second connecting plate away from the connecting shaft.

6. A quick-change adapter for a molybdenum mandrel according to claim 5, characterized in that: The first fixed shaft and the second fixed shaft are respectively fixedly connected to the second connecting ring and the protective ring.

Images