Heat treatment vacuum tank

Abstract

The utility model discloses a heat treatment vacuum tank, which belongs to the technical field of heat treatment process equipment and is mainly used for metal material processing. The heat treatment vacuum tank comprises a tank body with one end provided with a tank opening, and the outer side of the tank opening is detachably connected with a heat insulation assembly with the center provided with corresponding through holes, a connecting flange and an air nozzle used for being communicated with an air exhaust assembly in sequence. The heat insulation assembly comprises a cooling copper disc and a heat insulation box which are sequentially arranged, the cooling copper disc is filled with water, and the heat insulation box is filled with heat insulation materials. According to the heat treatment vacuum tank, the heat insulation assembly is additionally arranged at the tank opening, the cooling copper disc cools heat overflowing out of the tank opening, the heat insulation box separates the heat from the connecting flange, damage caused by excessive heating of a connecting pipeline connecting the air exhaust assembly and the air tap is avoided, the service life of the heat treatment vacuum tank is prolonged, and the air exhaust assembly is communicated with the air tap and can be maintained and replaced in time; and the vacuum degree of the tank body is prevented from being influenced by the arrangement of the heat insulation assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment process equipment, in particular to a heat treatment vacuum tank. Background Art

[0002] Vacuum heat treatment refers to the process of heat treatment under vacuum degree less than 10Pa (usually 10 -1 -10 -3 The heat treatment process of heating in the Pa) environment has the characteristics of no oxidation, no decarburization and no element depletion, and can achieve bright heat treatment; it can degrease and degas parts to avoid surface contamination and hydrogen embrittlement; it can control heating and cooling, reduce heat treatment deformation, and improve mold performance; it also has the advantages of easy automation, flexibility and clean heat treatment.

[0003] At present, a heat treatment vacuum tank is commonly used as a vacuum heat treatment equipment, such as the external heating heat treatment vacuum tank described in CN105004178B. The external heating heat treatment vacuum tank extracts the air and impurities in the tank through the vacuum assembly arranged at the top opening of the tank body, and then uses the electric heating element to heat the outside of the vacuum tank, and transfers the heat energy to the metal material by radiation or conduction, so as to achieve heating of the metal material; but since the temperature of the tank body rises after heating, it will affect the vacuum of the connecting pipe between the vacuum assembly and the tank body, and the high temperature can easily cause damage to the vacuum pipe, which cannot be used for a long time, and since the vacuum pipe is connected to the inside of the tank body, it cannot be replaced in time. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a heat treatment vacuum tank, which is mainly used for metal material processing, so as to achieve the purpose of reducing the influence of the tank body heating on the exhaust component under the condition of ensuring the normal use of the heat treatment vacuum tank.

[0005] The utility model discloses a heat treatment vacuum tank, comprising a tank body, a tank mouth is provided at one end of the tank body, an exhaust assembly sealed with the tank body is provided on the outer side of the tank mouth, an insulation assembly consistent with the size of the tank body is provided on the outer side of the tank mouth, the insulation assembly comprises a cooling copper plate and an insulation box, the cooling copper plate is detachably arranged on the outer side of the tank mouth, the cooling copper plate is filled with water, a first through hole is provided at the center of the cooling copper plate, the insulation box is detachably arranged at a side of the cooling copper plate away from the tank body, the insulation box is filled with insulation material, a second through hole corresponding to the first through hole is provided at the center of the insulation box, a connecting flange is detachably provided on the side of the insulation box away from the cooling copper plate, a third through hole corresponding to the second through hole is provided at the center of the connecting flange, an air nozzle for communicating with the exhaust assembly is detachably provided on the side of the connecting flange away from the insulation box, and the through hole of the air nozzle corresponds to the third through hole.

[0006] Furthermore, multiple groups of heat insulation components are provided and are sequentially arranged outside the tank mouth along the length direction of the tank body. A sealing connecting piece is provided between two adjacent heat insulation components.

[0007] As a preferred embodiment, the heat insulation box close to the tank body is filled with ceramic fiber felt, and the heat insulation box close to the connecting flange is filled with graphite felt.

[0008] Furthermore, protrusions are provided on both the upper and lower sides of the tank mouth. Grooves adapted to the protrusions are provided on the cooling copper disc close to the tank mouth. Vacuum grease is filled in the protrusions and grooves.

[0009] Furthermore, a water inlet is provided at the lower end of the cooling copper disc, and a water outlet is provided at the upper end of the cooling copper disc.

[0010] Furthermore, a slide rail assembly is provided inside the tank body. The slide rail assembly includes a fixed rail and a storage table. The fixed rail is welded to the side wall of the tank body in a suspended manner along the length direction of the tank body. A slider is provided below the storage table, and the slider is slidably connected to the fixed rail.

[0011] Furthermore, one end of the tank body far away from the opening is a bottom plate, and a V-shaped welding groove is adopted between the bottom plate and the tank body.

[0012] Furthermore, the tank body is cylindrical.

[0013] As a preferred embodiment, the tank body is made of austenitic stainless steel.

[0014] The beneficial effects of the present utility model are as follows: By adding heat insulation components at the tank mouth, using the cooling copper disc to cool the heat overflowing from the tank mouth, and using the heat insulation box to separate the heat from the connecting flange and the air extraction assembly, it is avoided that the connecting pipe connected to the air nozzle in the air extraction assembly is damaged due to excessive heating, and it can be used for a long time. And because the air extraction assembly is connected to the air nozzle, when the connecting pipe is damaged and needs to be replaced, it can be repaired and replaced in time. At the same time, when connecting the tank mouth, the heat insulation components and the connecting flange, the airtightness of the tank body is ensured, and it is avoided that the vacuum degree inside the tank body is affected due to the setting of the heat insulation components. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : Structural schematic diagram of the heat treatment vacuum tank;

[0016] Figure markings: 1-tank body; 11-tank mouth; 111-protrusion; 12-bottom plate; 2-thermal insulation assembly; 21-cooling copper plate; 211-groove; 212-first through hole; 213-water inlet; 214-water outlet; 22-thermal insulation box; 221-thermal insulation material; 222-second through hole; 3-connecting flange; 31-third through hole; 32-air nozzle; 321-through hole; 4-slide rail assembly; 41-fixed rail; 42-storage table; 421-slider; 5-vacuum assembly; 51-connecting pipe; 6-bolt connector; 7-clamp connector. DETAILED DESCRIPTION

[0017] The utility model is further described below.

[0018] The utility model provides a heat treatment vacuum tank, which is mainly used for metal material processing, including a tank body 1, a tank mouth 11 is opened at one end of the tank body 1, and an exhaust component 5 sealed and connected to the tank body 1 is arranged on the outside of the tank mouth 11, characterized in that: a heat insulation component 2 with the same size as the tank body 1 is arranged on the outside of the tank mouth 11, and the heat insulation component 2 includes a cooling copper plate 21 and a heat insulation box 22, the cooling copper plate 21 is detachably arranged on the outside of the tank mouth 11, the cooling copper plate 21 is filled with water, a first through hole 212 is opened in the center of the cooling copper plate 21, and the heat insulation box 22 is provided with a heat insulation component 212. It is detachably arranged on the side of the cooling copper disk 21 away from the tank body 1, and the insulation box 22 is filled with insulation material 221. A second through hole 222 corresponding to the first through hole 212 is opened in the center of the insulation box 22. A connecting flange 3 is detachably provided on the side of the insulation box 22 away from the cooling copper disk 21, and a third through hole 31 corresponding to the second through hole 222 is opened in the center of the connecting flange 3. An air nozzle 32 for connecting with the exhaust assembly 5 is detachably provided on the side of the connecting flange 3 away from the insulation box 22, and the through hole 321 of the air nozzle 32 corresponds to the third through hole 31.

[0019] like Figure 1 As shown, the heat treatment vacuum tank includes a tank body 1, which needs to meet the characteristics of high temperature resistance and corrosion resistance. Specifically, austenitic stainless steel Cr25Ni2OSi2 can be selected as the tank body 1 material of the heat treatment vacuum tank; a tank mouth 11 is opened at one end of the tank body 1 for putting in and taking out metal materials, and a vacuum assembly 5 sealed with the tank body 1 is provided on the outside of the tank mouth 11. The tank body 1 is vacuumed by the vacuum assembly 5 to ensure the vacuum degree when the metal material is processed; a heat insulation assembly 2 is arranged on the outside of the tank mouth 11, and the vacuum assembly 5 is connected to the heat insulation assembly 2 to achieve communication with the tank body 1. The heat insulation assembly 2 includes a cooling copper plate 21 and a heat insulation box 22. The cooling copper plate 21 is detachably installed on the outside of the tank mouth 11, and can be specifically connected by flange connection, clamp connection or the like. Figure 1In the bolt connection shown, cooling water is filled in the cooling copper disc 21, and the water temperature is maintained through a water circulation system (not shown in the figure), so as to achieve rapid cooling of the tank opening 11 and the surrounding area; a first through hole 212 is opened in the center of the cooling copper disc 21 for the air extraction assembly 5 to extract and discharge the gas in the tank body 1; the heat insulation box 22 is detachably arranged on the side of the cooling copper disc 21 away from the tank body 1, and specifically, flange connection, clamp connection or bolt connection as shown in Figure 1 can be adopted. Heat insulation materials 221, such as aerogel, foam board and other materials, are filled in the heat insulation box 22 to reduce heat transfer to the outside world and prevent the air extraction assembly 5 arranged on the side of the heat insulation assembly 2 away from the tank body 1 from being affected by high temperature. Similarly, a second through hole 222 corresponding to the first through hole 212 is opened in the center of the heat insulation box 22 to keep the air extraction channel unblocked; a connecting flange 3 is arranged on the side of the heat insulation box 22 away from the cooling copper disc 21, and a third through hole 31 corresponding to the second through hole 222 is opened in the center of the connecting flange 3 to keep the air extraction channel unblocked. The connecting flange 3 is fixedly connected to the heat insulation box 22 through bolts or other fastening devices for easy disassembly and maintenance; to ensure the airtightness of the heat treatment vacuum tank and prevent external air from entering and reducing the vacuum degree in the tank body 1, a rubber gasket is arranged circumferentially on the connecting flange 3; a nozzle 32 for communicating with the air extraction assembly 5 is arranged on the side of the connecting flange 3 away from the heat insulation box 22, and the through hole 321 of the nozzle 32 corresponds to the third through hole 31 to ensure that the air extraction assembly 5 can be smoothly connected and operate. The air extraction assembly 5 is communicated with the inside of the tank body 1 through the nozzle 32 to realize the vacuum pumping operation of the vacuum tank. By adding the heat insulation assembly 2 at the tank opening 11, the heat treatment vacuum tank uses the cooling copper disc 21 to cool the heat overflowing from the tank opening 11, and then uses the heat insulation box 22 to separate the heat from the connecting flange 3 and the air extraction assembly 5, avoiding damage to the connecting pipe 51 connected to the nozzle 32 in the air extraction assembly 5 due to excessive heat, and can be used for a long time. And because the air extraction assembly 5 is communicated with the nozzle 32, when the connecting pipe 51 is damaged and needs to be replaced, it can be repaired and replaced in time. At the same time, when connecting the tank opening 11, the heat insulation assembly 2 and the connecting flange 3, the airtightness of the tank body 1 is ensured, and the vacuum degree inside the tank body 1 is prevented from being affected by the setting of the heat insulation assembly 2.

[0020] Since the cooling and heat exchange effect of the cooling water for cooling and heat exchange contained in the cooling copper disc 21 is limited, in order to ensure the cooling effect at the tank opening 11 and achieve layer-by-layer heat dissipation of the temperature at the tank opening 11 without affecting the temperature inside the tank body 1, such as Figure 1As shown, there are multiple groups of the heat insulation assembly 2, which are sequentially arranged outside the tank mouth 11 along the length direction of the tank body 1, and a sealing connector is provided between two adjacent heat insulation assemblies 2; as heat dissipation continues, the cooling effect of the cooling copper plate 21 is ultimately limited. By arranging multiple groups of heat insulation assemblies 2 and spacing multiple cooling copper plates 21 from the heat insulation box 22, while cooling, it is ensured that the heat at the tank mouth 11 does not affect the heat inside the tank body 1. By setting multiple heat insulation assemblies 2, the temperature can be completely lowered, which conforms to the actual production situation; a sealing connector is provided between two adjacent heat insulation assemblies 2, and this sealing connector can adopt existing components such as flanges and clamps in cooperation with sealing materials such as rubber gaskets to achieve a good sealing effect and ensure the vacuum degree of the tank body 1 during use.

[0021] To enhance the heat absorption effect of the heat insulation box 22 and ensure that the heat at the tank mouth 11 gradually decreases under the heat absorption effect of the heat insulation assembly 2, ceramic fiber felt is filled in the heat insulation box 22 close to the tank body 1, and graphite felt is filled in the heat insulation box 22 close to the connecting flange 3; ceramic fiber felt has good high-temperature resistance and heat insulation performance, and can effectively block the high-temperature radiation from the tank body 1, so as to use the cooling copper plate 21 close to the tank mouth 11 for cooling treatment, and at the same time ensure that the temperature inside the tank body 1 meets the requirements for processing metal materials; graphite felt not only has good thermal conductivity, but also can maintain stable performance at high temperatures, which helps to quickly conduct the remaining heat and dissipate heat through the cooling water in the cooling copper plate 21. It should be noted that the design key point of the heat insulation layer is to minimize the heat transmitted from the direction of the tank body 1 and prevent overheating. After data query and relevant control experiments, the thickness of the cooling copper plate 21 can be 15 mm, the ceramic fiber felt layer can be 30 mm, and the graphite felt layer can be 10 mm to achieve step-by-step heat absorption and cooling, avoid waste caused by too thick materials, and avoid the inability to achieve the corresponding cooling effect due to too thin materials.

[0022] To enhance the airtightness at the connection between the tank mouth 11 and the cooling copper plate 21, as Figure 1 shown, protrusions 111 are provided on both the upper and lower sides of the tank mouth 11, and grooves 211 adapted to the protrusions 111 are provided on the cooling copper plate 21 close to the tank mouth 11, and vacuum grease is filled in the protrusions 111 and the grooves 211; protrusions 111 are provided on both the upper and lower sides of the tank mouth 11. When installing the cooling copper plate 21, align the grooves 211 on the cooling copper plate 21 with the protrusions 111 at the tank mouth 11, and then connect them through detachable connectors such as bolts or flanges provided on the cooling copper plate 21. To ensure the connection tightness, vacuum grease is filled in the protrusions 111 and the grooves 211. Using the excellent fluidity and sealing performance of this vacuum grease, fill the tiny gaps between the protrusions 111 and the grooves 211 to form a continuous sealing layer, effectively preventing the leakage of gas or liquid, and also preventing external air or impurities from entering the inside of the tank body 1, so as to maintain the cleanliness and vacuum degree inside the tank body 1.

[0023] To further improve the cooling and heat insulation effect of the cooling copper disc 21 and ensure that the temperature at the connection between the air extraction assembly 5 and the tank body 1 will not be too high, a water inlet 213 is provided at the lower end of the cooling copper disc 21, and a water outlet 214 is provided at the upper end of the cooling copper disc 21; by providing a water inlet 213 at the lower end of the cooling copper disc 21 and a water outlet 214 at the upper end, a water circulation is formed within the cooling copper disc 21 during use to achieve cooling at the tank opening 11, ensure the safe use of the connection between the air extraction assembly 5 and it, and by setting the water inlet 213 below the cooling copper disc 21 and the water outlet 214 above the cooling copper disc 21, injecting water from bottom to top can maximize the utilization of the cooling capacity of the cooling water and improve the heat exchange efficiency.

[0024] To facilitate the placement and removal of metal materials into the tank body 1, such as Figure 1 As shown, a slide rail assembly 4 is provided inside the tank body 1. The slide rail assembly 4 includes a fixed rail 41 and a placement table 42. A slide rail assembly 4 is provided inside the tank body 1. The slide rail assembly 4 includes a fixed rail 41 and a placement table 42. The fixed rail 41 is welded to the side wall of the tank body 1 in a suspended manner along the length direction of the tank body 1. The two fixed rails 41 are oppositely arranged inside the tank body 1. Sliders 421 are respectively provided on both sides of the placement table 42. The sliders 421 are slidably connected to the fixed rail 41; by providing a slide rail assembly 4 inside the tank body 1, to reduce the influence of this slide rail assembly 4 on the vacuum degree inside the tank body 1, the fixed rail 41 is welded to the side wall of the tank body 1 in a suspended manner along the length direction of the tank body 1. Through the suspended welding treatment, the sealing performance between the guide rail and the tank opening 11 is ensured, so that the heat treatment vacuum tank can install the fixed rail 41 without affecting its sealing performance and ensuring the vacuum degree after the air extraction assembly 5 extracts air. A placement table 42 is slidably arranged on the fixed rail 41. Specifically, sliders 421 slidably connected to the fixed rail 41 are provided on both sides of the placement table 42. By providing sliders 421 on both sides of the placement table 42, the placement table 42 can be arranged between the two fixed rails 41 to form a stable sliding structure, which can not only facilitate the placement and removal of metal materials, enable the operator to safely remove the heated metal materials, and place the metal materials on the placement table 42, but also ensure that the metal materials are evenly heated, improve work efficiency and the safety during the placement and removal of metal materials; and to ensure that this slide rail assembly 4 will not be affected by the high temperature inside the tank body 1 during use, the material for making this slide rail assembly 4 should consider physical properties such as wear resistance, thermal stability, vacuum tightness, and workability of the material. Specifically, austenitic SUS316 stainless steel can be selected. This material has good workability and corrosion resistance and is inexpensive.

[0025] For the convenience of welding, the heat treatment vacuum tank uses tungsten inert gas shielded welding. When manufacturing a large heat treatment vacuum tank by welding, since the tank body 1 is not easy to be turned over, it is impossible to ensure the welding firmness of the welding points. The end of the tank body 1 far from the tank mouth 11 is regarded as the bottom plate 12. When welding the bottom plate 12 and the tank body 1, a V-shaped welding groove is used for welding, which can achieve single-sided welding. The welding of the tank body 1 can be realized without turning over the welded part, which is convenient for the operator to manufacture a large heat treatment vacuum tank. Moreover, the bottom plate 12 of the tank body 1 can be made of materials resistant to corrosion, high temperature and high pressure. Specifically, SSL316 stainless steel material can be selected. This material has good corrosion resistance, heat resistance and high pressure resistance to ensure the normal use of the tank body 1.

[0026] To ensure that the heating element located outside the tank body 1 heats the tank body 1 evenly, the tank body 1 is cylindrical. By setting the tank body 1 to be cylindrical, the heating element outside can evenly heat the circumferential direction of the tank body 1, and through radiation, transfer the heat energy to the metal material placed in the tank body 1 to ensure that the material is heated evenly and improve the heat treatment efficiency. Further, to enhance the corrosion resistance and heat resistance of the tank body 1, the tank body 1 is made of austenitic stainless steel.

Claims

1. A heat treatment vacuum tank, comprising a tank body (1), one end of the tank body (1) is provided with a tank opening (11), the outer side of the tank opening (11) is provided with a vacuum assembly (5) sealedly connected to the tank body (1), characterized in that: The outer side of the tank mouth (11) is provided with a heat insulation component (2) having the same size as the tank body (1), and the heat insulation component (2) comprises a cooling copper plate (21) and a heat insulation box (22). The cooling copper plate (21) is detachably arranged on the outer side of the tank mouth (11), the interior of the cooling copper plate (21) is filled with water, a first through hole (212) is provided at the center of the cooling copper plate (21), and the heat insulation box (22) is detachably arranged on a side of the cooling copper plate (21) away from the tank body (1), and the interior of the heat insulation box (22) is filled with heat insulation material (221). A second through hole (222) corresponding to the first through hole (212) is provided at the center of the heat insulation box (22); a connecting flange (3) is detachably provided on the side of the heat insulation box (22) facing away from the cooling copper plate (21); a third through hole (31) corresponding to the second through hole (222) is provided at the center of the connecting flange (3); a gas nozzle (32) for connecting to the exhaust assembly (5) is detachably provided on the side of the connecting flange (3) facing away from the heat insulation box (22); and a through hole (321) of the gas nozzle (32) corresponds to the third through hole (31).

2. A heat treatment vacuum tank according to claim 1, characterized in that: The heat insulation components (2) are multiple groups, which are sequentially arranged outside the tank mouth (11) along the length direction of the tank body (1), and a sealing connection piece is provided between two adjacent heat insulation components (2).

3. A heat treatment vacuum tank according to claim 2, characterized in that: The heat insulation box (22) close to the tank body (1) is filled with ceramic fiber felt, and the heat insulation box (22) close to the connecting flange (3) is filled with graphite felt.

4. A heat treatment vacuum tank according to claim 1, characterized in that: The upper and lower sides of the tank mouth (11) are both provided with protrusions (111), and the cooling copper plate (21) close to the tank mouth (11) is provided with a groove (211) adapted to the protrusion (111), and the protrusion (111) and the groove (211) are filled with vacuum grease.

5. A heat treatment vacuum tank according to claim 1, characterized in that: The lower end of the cooling copper plate (21) is provided with a water inlet (213), and the upper end of the cooling copper plate (21) is provided with a water outlet (214).

6. A heat treatment vacuum tank according to claim 1, characterized in that: A slide rail assembly (4) is provided in the tank body (1), and the slide rail assembly (4) comprises a fixed rail (41) and a storage platform (42). The fixed rail (41) is welded to the side wall of the tank body (1) in the air along the length direction of the tank body (1), and the two fixed rails (41) are arranged opposite to each other in the tank body (1). Slide blocks (421) are respectively provided on both sides of the storage platform (42), and the slide blocks (421) are slidably connected to the fixed rail (41).

7. A heat treatment vacuum tank according to claim 1, characterized in that: The end of the tank body (1) away from the opening is a bottom plate (12), and a V-shaped welding groove is used between the bottom plate (12) and the tank body (1).

8. A heat treatment vacuum tank according to claim 1, characterized in that: The tank body (1) is cylindrical.

9. A heat treatment vacuum tank according to claim 8, characterized in that: The tank body (1) is made of austenitic stainless steel.

Images