A connecting barrel

Abstract

The application relates to a connecting cylinder, and relates to the field of magnetic material preparation equipment, which comprises a connecting cylinder body, sealing connecting assemblies distributed at two ends of the connecting cylinder body, and two first control valves fixedly connected to the connecting cylinder body and communicated with the connecting cylinder body. The application has the effects that inert protective gas is introduced through the first control valve to discharge oxygen in the connecting cylinder body, the probability of oxidation of small-particle-diameter magnetic powder is reduced, the utilization rate of raw materials is improved, and the production cost is reduced.

Description

Technical Field

[0001] This application relates to the field of magnetic material preparation equipment, and in particular to a connecting cylinder. Background Technology

[0002] The manufacturing process of magnets includes raw material crushing and powdering, magnetic powder stamping into blocks, magnetic block sintering, and magnetic block magnetization. During the magnetic powder stamping process, to ensure the uniformity of the stamped magnetic blocks, the magnetic powder before stamping must have sufficient fluidity to ensure uniformity within the stamping die. Currently, the prepared and ground magnetic powder is continuously fed into a magnetic powder storage tank. However, during the process of transporting the magnetic powder from the air jet mill to the storage tank, the highly oxidizable magnetic powder reacts upon contact with oxygen, and the introduction of oxides significantly reduces the magnetic properties of the magnet. Metal powder with excessively small particle sizes is more easily oxidized by oxygen during the manufacturing process, negatively impacting the magnetic properties of the magnetic material. Therefore, small-particle-size magnetic powder is discarded midway through the manufacturing process to ensure the stability of the magnetic powder.

[0003] Regarding the aforementioned technologies, the inventors believe that pressing metal powder with excessively small particle size together with magnetic powder into blocks can further improve the magnetic properties of the magnetic material. Furthermore, discarding small-particle magnetic powder reduces the utilization rate of raw materials and increases production costs, indicating that there is still room for improvement. Utility Model Content

[0004] In order to improve the situation where discarding small-diameter magnetic powder reduces the utilization rate of raw materials and increases production costs, this application provides a connecting cylinder.

[0005] The connecting cylinder provided in this application adopts the following technical solution: A connecting cylinder includes a connecting cylinder body, sealing connection assemblies distributed at both ends of the connecting cylinder body, and two first control valves fixedly connected to and communicating with the connecting cylinder body.

[0006] By adopting the above technical solution, the main body of the connecting cylinder forms a channel for conveying magnetic powder. The two first control valves can introduce inert protective gas to discharge oxygen inside the main body of the connecting cylinder, reducing the oxidation of magnetic powder during the conveying process. The sealing connection components at both ends can be sealed to the air jet mill and the magnetic powder storage tank respectively, reducing the risk of external oxygen entering the interior of the connecting cylinder, thereby reducing the probability of small-diameter magnetic powder being oxidized, improving raw material utilization, and reducing production costs.

[0007] Optionally, the sealing connection assembly includes two first sealing rings respectively fitted onto both ends of the connecting cylinder body and fasteners fitted onto the sealing rings one-to-one.

[0008] By adopting the above technical solution, the first sealing ring fills the gap between the connecting cylinder body and the external equipment (airflow pulverizer or magnetic powder storage tank), and the fasteners press the first sealing ring tightly, thereby enhancing the sealing of the connection, preventing external oxygen from entering, and improving the anti-oxidation effect.

[0009] Optionally, the sealing connection assembly includes two connecting rings respectively fixedly connected to both ends of the connecting cylinder body and at least one second sealing ring fixedly connected to the connecting ring on the side away from the connecting cylinder body. The connecting ring is provided with a plurality of mounting holes for fixing the connecting ring to the airflow pulverizer or magnetic powder storage tank.

[0010] By adopting the above technical solution, the second sealing ring is pressed between the end face of the connecting ring and the external equipment, effectively filling the connection gap and blocking the passage of external oxygen into the main body of the connecting cylinder through the connection part, thereby improving the overall sealing reliability.

[0011] Optionally, the connecting ring is provided with an embedding groove for positioning and installing the second sealing ring.

[0012] By adopting the above technical solution, the annular groove forms a radial limit on the second sealing ring, preventing the sealing ring from shifting or being squeezed and deformed during the mating and fastening process of the connecting ring, ensuring that the sealing ring accurately fits the sealing surface and improving the sealing effect; at the same time, the groove can enhance the connection stability between the sealing ring and the connecting ring, preventing the sealing ring from falling off due to vibration and other factors during long-term use, and maintaining the durability of the sealing effect.

[0013] Optionally, two concentrically arranged second sealing rings are fixedly connected to the side of the connecting ring away from the connecting cylinder body.

[0014] By adopting the above technical solution, the double concentric sealing rings form a double barrier on the end face of the connecting ring. When the outer sealing ring fails due to wear, aging, etc., the inner sealing ring can still block the oxygen intrusion path and extend the service life of the connecting cylinder. On the other hand, the radial spacing design extends the gas permeation path, and together with the tightening pressure of the connecting ring and the external equipment, it significantly improves the sealing redundancy.

[0015] Optionally, the connecting ring has an annular groove between the two second sealing rings on the side away from the connecting cylinder body, and two second control valves communicating with the annular groove are fixedly connected to the side of the connecting ring closer to the connecting cylinder body.

[0016] By adopting the above technical solution, the annular groove is located between the double seals and forms an independent air chamber in cooperation with the external equipment; the second control valve can introduce inert protective gas into the air chamber and maintain a slight positive pressure. When a slight leakage occurs in the outer sealing ring, the protective gas in the air chamber can overflow outward, preventing outside air from entering the inner sealing area and further reducing the risk of magnetic powder oxidation.

[0017] Optionally, the air inlet of one of the first control valves and the air inlets of two of the second control valves located at both ends of the connecting cylinder body are connected by a four-way connector.

[0018] By adopting the above technical solution, the first control valve and the second control valve can share a common protective gas source, simplifying the pipeline connection structure and reducing equipment costs. On the other hand, it also facilitates unified control of the protective gas flow rate, ensuring the coordination of gas supply inside the connecting cylinder and the annular groove, and improving operational convenience.

[0019] Optionally, the connecting ring is integrally connected with a guide portion extending into the connecting cylinder body.

[0020] By adopting the above technical solution, the guide part can guide the magnetic powder in the transition area between the connecting cylinder body and the connecting ring, reduce the accumulation of magnetic powder in the dead corner of the connection between the connecting ring and the connecting cylinder body, and ensure the smoothness of the conveying.

[0021] Optionally, a heat insulation pad is fixedly connected to the outer peripheral sidewall of the connecting cylinder body.

[0022] By adopting the above technical solution, the heat insulation pad blocks the heat exchange between the main body of the connecting cylinder and the external environment, maintains the stability of the magnetic powder temperature, and ensures the oxidation resistance of the magnetic powder. On the other hand, the heat insulation pad has a certain degree of elasticity, which can play a buffering role when the main body of the connecting cylinder is hit by external impacts, reduce the risk of deformation of the main body, and indirectly ensure the oxygen intrusion prevention effect of the sealed connection component.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. This application introduces inert protective gas through the first control valve to discharge oxygen inside the connecting cylinder body, thereby reducing the probability of small-diameter magnetic powder being oxidized, improving raw material utilization, and reducing production costs; 2. The first sealing ring fills the gap between the connecting cylinder body and the external equipment connection part, and the fasteners press the first sealing ring tightly, which enhances the sealing of the connection part and improves the anti-oxidation effect; 3. When the annular groove and external equipment work together to form an independent gas chamber and inert protective gas is introduced, if a small amount of leakage occurs in the outer sealing ring, the protective gas in the gas chamber will overflow outward, preventing outside air from entering the inner sealing area and further reducing the risk of magnetic powder oxidation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the connecting cylinder in Embodiment 1 of this application.

[0025] Figure 2 yes Figure 1 Enlarged structural diagram of section A in the middle.

[0026] Figure 3 This is a schematic diagram of the connecting cylinder in Embodiment 2 of this application.

[0027] Figure 4 This is an exploded partial view of the connecting component and the main body of the connecting cylinder in Embodiment 2 of this application.

[0028] Figure 5 This is a partial half-section view of the connecting cylinder in Embodiment 2 of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Connecting cylinder body; 11. Heat insulation pad; 2. Sealing connection assembly; 21. First sealing ring; 22. Fastener; 221. Mounting part; 222. Fastening bolt; 223. Nut; 23. Connecting ring; 231. Mounting hole; 232. Embedding groove; 233. Ring groove; 234. Second control valve; 235. Guide part; 24. Second sealing ring; 3. First control valve. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0031] This application discloses a connecting tube.

[0032] Example 1: Reference Figure 1 The connecting cylinder includes a connecting cylinder body 1, a sealing connection assembly 2, and two first control valves 3. The sealing connection assembly 2 is installed at both ends of the connecting cylinder body 1 to seal the connecting cylinder body 1 to the air jet mill and the magnetic powder storage tank, respectively. The two first control valves 3 are fixedly connected to both sides of the connecting cylinder body 1 to allow the user to introduce inert gas into the connecting cylinder body 1 while simultaneously expelling oxygen.

[0033] Reference Figure 1 A heat insulation pad 11 is wrapped around the outer periphery of the connecting cylinder body 1. The heat insulation pad 11 is fixedly connected to the connecting cylinder body 1 by two metal hoops respectively sleeved on both sides of the connecting cylinder body 1, so as to block the heat exchange between the connecting cylinder body 1 and the external environment and maintain the stability of the magnetic powder temperature.

[0034] Reference Figure 1 and Figure 2The sealing connection assembly 2 includes two first sealing rings 21 and two fasteners 22. The first sealing rings 21 are respectively fitted onto both ends of the connecting cylinder body 1 to seal the connection between the connecting cylinder body 1 and the external equipment (airflow pulverizer and magnetic powder storage tank). The two fasteners 22 are respectively fitted onto the first sealing rings 21 in a one-to-one correspondence. One side of each fastener 22 has an opening to facilitate installation by workers. Mounting portions 221 extend integrally from both sides of the opening on each fastener 22. Fastening bolts 222 pass through the mounting portions 221, and nuts 223 are arranged on the fastening bolts 222. The heads of the nuts 223 and the bolts respectively abut against the opposite sides of the two mounting portions 221 to press the first sealing rings 21 tightly.

[0035] The implementation principle of Example 1 is as follows: Align the two ends of the connecting cylinder body 1 with the discharge port of the air jet mill and the inlet of the magnetic powder storage tank respectively, and put the first sealing ring 21 on the connection between the connecting cylinder body 1 and the air jet mill and the magnetic powder storage tank respectively. Then, press the first sealing ring 21 with the fastener 22 to achieve a sealed connection between the connecting cylinder body 1 and the air jet mill and the magnetic powder storage tank. Open the first control valve 3 and introduce inert gas into the connecting cylinder body 1 to expel the oxygen in the connecting cylinder body 1. Then close the first control valve 3. At this time, open the valves on the discharge port of the air jet mill and the inlet of the magnetic powder storage tank to realize the conveying of magnetic powder.

[0036] Example 2: Reference Figure 3 and Figure 4 The difference between this embodiment and Embodiment 1 is that the sealing connection assembly 2 includes two connecting rings 23 and at least one second sealing ring 24. The two connecting rings 23 are respectively fixedly connected to both ends of the connecting cylinder body 1. Several mounting holes 231 are radially distributed on the connecting rings 23 to fix the connecting cylinder body 1 to the airflow pulverizer and the magnetic powder storage tank, respectively. The side of the connecting ring 23 away from the connecting cylinder body 1 has an annular embedding groove 232 corresponding to the second sealing ring 24 for mounting the second sealing ring 24. In this embodiment, each connecting ring 23 has two concentrically arranged embedding grooves 232, and the second sealing ring 24 is fixedly connected to the bottom of the embedding groove 232 to provide a seal between the connecting cylinder body 1 and the airflow pulverizer or the magnetic powder storage tank.

[0037] Reference Figure 3 and Figure 4The connecting ring 23 has an annular groove 233 on the side away from the connecting cylinder body 1. The annular groove 233 is located between the two second sealing rings 24 and is concentrically arranged with the two second sealing rings 24. Two second control valves 234 are fixedly connected to the side of the connecting ring 23 closest to the connecting cylinder body 1. The two second control valves 234 are symmetrically arranged on both sides of the connecting ring 23 and are both connected to the annular groove 233. When the connecting ring 23 comes into contact with and is fixedly connected to the air jet mill or magnetic powder storage tank, the connecting ring 23 forms an annular gas cavity at the annular groove 233. Inert gas is introduced into the annular gas cavity through the second control valves 234, while oxygen is discharged, thus forming an inert gas sealing layer between the two second sealing rings 24.

[0038] Reference Figure 3 In order to facilitate unified control of the amount of protective gas introduced, the air inlet of one of the first control valves 3 and the air inlets of two of the second control valves 234 located at both ends of the connecting cylinder body 1 are connected by a four-way connector so that the first control valve 3 and the second control valve 234 can share a gas source.

[0039] Reference Figure 5 The connecting ring 23 is integrally connected with a guide portion 235 extending into the connecting cylinder body 1. The inner diameter of the guide portion 235 gradually decreases from the side away from the connecting cylinder body 1 to the side close to the connecting cylinder body 1, so as to reduce the accumulation of magnetic powder at the connection between the connecting ring 23 and the air jet mill or magnetic powder storage tank.

[0040] The implementation principle of Example 2 is as follows: Align the two ends of the connecting cylinder body 1 with the outlet of the air jet mill and the inlet of the magnetic powder storage tank respectively. Fix the connecting cylinder body 1 to the air jet mill and the magnetic powder storage tank respectively through the mounting hole 231. At this time, the two sides of the second sealing ring 24 abut against the connecting ring 23 and the air jet mill and the magnetic powder storage tank respectively, and the connecting ring 23 and the external equipment form an air cavity at the ring groove 233. Open the first control valve 3 and the second control valve 234 respectively, and introduce inert gas into the air cavity formed by the connecting cylinder body 1, the connecting ring 23 and the external equipment at the annular groove 233, while simultaneously expelling oxygen. Then close the first control valve 3 and the second control valve 234. At this time, an inert gas sealing layer is formed between the two second sealing rings 24, realizing a three-layer sealing structure for the magnetic powder conveying channel. The magnetic powder can be conveyed by opening the valves on the discharge port of the airflow pulverizer and the inlet port of the magnetic powder storage tank respectively.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A connecting cylinder, characterized in that: It includes a connecting cylinder body (1), sealing connection assemblies (2) distributed at both ends of the connecting cylinder body (1), and two first control valves (3) fixedly connected to the connecting cylinder body (1) and communicating with the connecting cylinder body (1).

2. The connecting cylinder according to claim 1, characterized in that: The sealing connection assembly (2) includes two first sealing rings (21) respectively fitted onto both ends of the connecting cylinder body (1) and fasteners (22) fitted onto the sealing rings one by one.

3. The connecting cylinder according to claim 1, characterized in that: The sealing connection assembly (2) includes two connecting rings (23) respectively fixedly connected to both ends of the connecting cylinder body (1) and at least one second sealing ring (24) fixedly connected to the side of the connecting ring (23) away from the connecting cylinder body (1). The connecting ring (23) is provided with a plurality of mounting holes (231) for fixing the connecting ring (23) and the airflow pulverizer or magnetic powder storage tank.

4. The connecting cylinder according to claim 3, characterized in that: The connecting ring (23) is provided with an embedding groove (232) for positioning and installing the second sealing ring (24).

5. The connecting cylinder according to claim 3, characterized in that: The connecting ring (23) is fixedly connected to two concentrically arranged second sealing rings (24) on the side away from the connecting cylinder body (1).

6. The connecting cylinder according to claim 5, characterized in that: The connecting ring (23) has an annular groove (233) between the two second sealing rings (24) on the side away from the connecting cylinder body (1). The connecting ring (23) has two second control valves (234) that communicate with the annular groove (233) on the side close to the connecting cylinder body (1).

7. The connecting cylinder according to claim 6, characterized in that: The air inlet of one of the first control valves (3) and the air inlets of two of the second control valves (234) located at both ends of the connecting cylinder body (1) are connected by a four-way connector.

8. The connecting cylinder according to claim 3, characterized in that: The connecting ring (23) is integrally connected to a guide portion (235) extending into the main body (1) of the connecting cylinder.

9. The connecting cylinder according to claim 1, characterized in that: A heat insulation pad (11) is fixedly connected to the outer peripheral side wall of the connecting cylinder body (1).

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