Tube heat treatment vacuum annealing furnace

Abstract

The present application relates to the field of annealing equipment. A vacuum annealing furnace for heat treatment of pipes includes a furnace body, a gate, a carrying platform and a vacuum pumping device. The furnace body has an opening. The gate is movably connected to the furnace body. The gate is used to close the opening. The carrying platform is used to support the pipes. The carrying platform is used to move inside and outside the furnace body. The vacuum pumping device is used to extract the gas in the furnace body. During the annealing process, the carrying platform can move inside the furnace body, which is beneficial to uniform heating of the pipes. The vacuum pumping device is used to extract the gas in the furnace body: reduce the oxygen content in the furnace body and reduce oxidation of the pipes; during the gas extraction process, the gas flow in the furnace body is promoted, which is beneficial to uniform temperature in the furnace body; after the gas extraction is completed, the gas content in the furnace body is reduced, reducing the impact of the gas on heat transfer, which is beneficial to uniform temperature in the furnace body. Improve the uniformity of pipe annealing.

Description

Technical Field

[0001] The present application relates to the field of annealing equipment, and in particular to a vacuum annealing furnace for heat treatment of pipes. Background Art

[0002] Annealing is a heat treatment process widely used in materials science. In metal materials, the annealing process involves slowly heating the metal to a certain temperature, keeping it for a sufficient time, and then cooling it at a suitable rate.

[0003] The annealing treatment of titanium alloy tubes usually adopts static annealing, that is, the titanium alloy tube is placed in a fixed position in the furnace for heating and cooling. Although this method is simple to operate, it is easy to cause uneven annealing of the titanium alloy tube due to the uneven temperature distribution in the furnace, which affects the product quality. Summary of the invention

[0004] In order to improve the uniformity of tube annealing, the present application provides a vacuum annealing furnace for heat treatment of tubes.

[0005] The present application provides a vacuum annealing furnace for heat treatment of pipes, which adopts the following technical solutions:

[0006] A vacuum annealing furnace for heat treatment of pipes, comprising a furnace body, a gate, a carrying platform and a vacuum pumping device.

[0007] The furnace body has an opening,

[0008] The gate is movably connected to the furnace body and is used to close the opening.

[0009] The carrying platform is used to support the tubes, and the carrying platform is used to move inside and outside the furnace body.

[0010] The vacuum pumping device is used to pump out the gas in the furnace body.

[0011] By adopting the above technical solution, the carrying platform can move in the furnace during the annealing process, which is conducive to uniform heating of the pipe. The gas in the furnace is extracted by vacuum equipment: the oxygen content in the furnace is reduced to reduce the oxidation of the pipe; during the extraction process, the gas flow (heat convection) in the furnace is promoted, which is conducive to uniform temperature in the furnace; after the extraction is completed, the gas content in the furnace is reduced, the effect of gas on heat transfer is reduced, and the temperature in the furnace is uniform. Improve the uniformity of pipe annealing.

[0012] Preferably, the carrying platform includes a bottom plate and a limiting rod.

[0013] The bottom plate is used to support the pipe material.

[0014] The limiting rod is vertical, and is connected to the bottom plate along a vertical sliding direction. A plurality of limiting rods are provided, and the limiting rods are used to touch the outer peripheral surface of the pipe.

[0015] By adopting the above technical solution, the carrying platform is located outside the furnace body. During the process of loading and unloading pipes, the height of the limit rod is adjusted according to the amount of pipes supported on the carrying platform, so as to facilitate the loading and unloading of pipes. For example, if there are only one or two pipes on the carrying platform, the limit rod can be adjusted to the lowest position to reduce the lifting height of the pipes during loading and unloading.

[0016] Preferably, the carrier platform includes a support block, including an adjustment structure.

[0017] The supporting block is vertically slidably connected to the bottom plate, and the supporting block is used to support the tube material.

[0018] The adjusting structure is used to adjust the height of the limiting rod according to the height of the supporting block, and the adjusting structure is used to make the moving direction of the limiting rod opposite to the moving direction of the supporting block.

[0019] By adopting the above technical solution, the pipe is placed on the supporting block, and the weight of the pipe causes the supporting block to move downward, and then the limiting rod is driven upward by adjusting the structure, and the limiting rod is used to prevent the pipe from leaving the carrying platform.

[0020] Preferably, the adjustment structure includes a base, a pressure block, an elastic member, a lifting rod and a transmission member.

[0021] The upper surface of the base is not higher than the lower surface of the bottom plate,

[0022] The pressure block is connected to the base in a vertical sliding direction, and the upper end of the pressure block is used to touch the supporting block.

[0023] The elastic member is connected between the base and the pressure block, and the elastic force of the elastic member on the pressure block is upward.

[0024] The lifting rod is connected to the base in a vertical sliding manner, and the upper end of the lifting rod is used to touch the limit rod.

[0025] The transmission member is used to make the moving direction of the pressure block opposite to the moving direction of the lifting rod.

[0026] By adopting the above technical solution, the weight of the pipe is transmitted to the pressure block through the supporting block, and the pressure block is also subjected to the elastic force of the elastic member. Based on the balancing force, the more pipes there are, the greater the elastic deformation of the elastic member, and the lower the height of the pressure block, and then the limit rod is made higher through the transmission member and the lifting rod. The more pipes there are, the higher the stacking height of the pipes is, and the higher the limit rod is, which is used to prevent the pipes from leaving the carrying platform.

[0027] Preferably, the base is provided with a sealed cavity, the lower end of the pressure block is used to extend into the sealed cavity, the lower end of the lifting rod is used to extend into the sealed cavity, the transmission member is located in the sealed cavity, and the transmission member includes liquid.

[0028] By adopting the above technical solution, force transmission is realized by utilizing the hydraulic principle. Compared with the mechanical transmission structure, the structure of this technical solution is simpler.

[0029] Preferably, the horizontal cross-sectional area of ​​the supporting block decreases from top to bottom, the bottom plate is provided with a limiting hole, and the supporting block is located in the limiting hole.

[0030] By adopting the above technical solution, the carrying platform is separated from the base and moved into the furnace body, and the supporting block is blocked by the inner wall of the limiting hole to prevent the supporting block from falling.

[0031] Preferably, the surface of the supporting block facing away from the furnace body is inclined from top to bottom towards the furnace body.

[0032] By adopting the above technical solution, the carrying platform is moved out of the furnace body, and the surface of the supporting block facing away from the furnace body can be used to touch the base to guide the supporting block to move upward.

[0033] Preferably, it comprises a guide rail and a support rail,

[0034] The guide rail is connected to the base, and the guide rail rises as it approaches the furnace body.

[0035] The support rail is located in the furnace body, and the support rail is flush with the highest point of the guide rail.

[0036] The carrying platform includes an abutment block,

[0037] The abutment block is connected to the limiting rod, and the lower surface of the abutment block is used to touch the guide rail and the support rail.

[0038] When the abutment block touches the highest point of the guide rail, the limit rod is located at the highest position.

[0039] By adopting the above technical solution, the pipes are placed on the carrying platform. When the carrying platform moves into the furnace body, the guide rail is used to raise the limit rod to the highest position. When the carrying platform is in the furnace body, the support rail provides support for the limit rod, so that the limit rod is maintained in the highest position, and the limit rod is used to prevent the pipes from leaving the carrying platform.

[0040] Preferably, comprising a moving rail,

[0041] The movable rail is slidably connected to the furnace body, and the movable rail is used to connect between the guide rail and the support rail.

[0042] The distance between the guide rail and the support rail is used to avoid the gate.

[0043] Preferably, the movable rail is connected to the gate.

[0044] By adopting the above technical solution, when the gate is opened, the movable rail is connected between the guide rail and the support rail; when the gate is closed, the movable rail avoids the gate.

[0045] In summary, the present application includes at least one of the following beneficial technical effects:

[0046] 1. During the annealing process, the carrier platform can move inside the furnace, which is conducive to uniform heating of the pipe. Use vacuum equipment to extract the gas inside the furnace: reduce the oxygen content in the furnace and reduce the oxidation of the pipe; during the vacuuming process, promote the flow of gas in the furnace (heat convection), which is conducive to uniform temperature inside the furnace; after the vacuuming is completed, reduce the gas content in the furnace, reduce the impact of gas on heat transfer, and is conducive to uniform temperature inside the furnace. Improve the uniformity of pipe annealing;

[0047] 2. When the carrying platform is located outside the furnace, the height of the limit rod is adjusted according to the amount of pipes supported on the carrying platform during the loading and unloading process to facilitate the loading and unloading of pipes. For example, if there are only one or two pipes on the carrying platform, the limit rod can be adjusted to the lowest position to reduce the lifting height of the pipes during loading and unloading;

[0048] 3. The weight of the material is transmitted to the pressure block through the supporting block, and the pressure block is also subjected to the elastic force of the elastic member. Based on the balancing force, the more pipes there are, the greater the elastic deformation of the elastic member, and the lower the height of the pressure block, and then the limit rod is made higher through the transmission member and the lifting rod. The more pipes there are, the higher the stacking height of the pipes is, and the higher the limit rod is, which is used to prevent the pipes from leaving the carrying platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of a vacuum annealing furnace for heat treatment of pipes.

[0050] Figure 2 It is a schematic diagram of the carrier platform.

[0051] Figure 3 is a schematic diagram of the regulatory structure.

[0052] Figure 4 It is a cross-sectional schematic diagram of the regulating structure and the carrying platform.

[0053] Explanation of the reference numerals: 11. furnace body; 12. gate; 13. vacuum equipment; 2. carrying platform; 21. bottom plate; 211. limiting hole; 212. through hole; 22. limiting rod; 23. supporting block; 24. abutment block; 31. guide rail; 32. support rail; 33. movable rail; 4. adjustment structure; 41. base; 411. sealing chamber; 412. avoidance groove; 413. through hole; 42. pressure block; 43. elastic member; 44. lifting rod; 45. transmission member. DETAILED DESCRIPTION

[0054] The present application is further described in detail below in conjunction with the accompanying drawings.

[0055] The embodiment of the present application discloses a vacuum annealing furnace for heat treatment of pipes.

[0056] Reference Figure 1 The tube heat treatment vacuum annealing furnace includes a furnace body 11, a gate 12 and a vacuum pumping device 13.

[0057] The furnace body 11 has an opening at the end thereof in the horizontal direction. The gate 12 is movably connected to the furnace body 11, and the gate 12 is used to close the opening. Specifically, the gate 12 is connected to the end of the furnace body 11 along the vertical sliding direction, and the gate 12 moves downward to close the opening. The gate 12 can be driven to move by a cylinder or an oil cylinder.

[0058] The vacuuming device 13 is connected to the furnace body 11. Specifically, the air inlet of the vacuuming device 13 is connected to the furnace body 11, so as to extract the gas in the furnace body 11. The vacuuming device 13 can be a vacuum pump.

[0059] Reference Figure 1 The tube heat treatment vacuum annealing furnace also includes a carrying platform 2 and a driving device.

[0060] The carrying platform 2 is used to support the pipes, and the carrying platform 2 is used to move horizontally inside and outside the furnace body 11. That is, the carrying platform 2 carries the pipes through the openings into and out of the furnace body 11. The driving device is used to drive the carrying platform 2 to move back and forth.

[0061] In one embodiment: the driving device includes a slide rail and a driving cylinder; one end of the slide rail extends into the furnace body 11 through an opening, and the other end of the slide rail is located outside the furnace body 11; the carrying platform 2 is slidably connected to the slide rail; the cylinder body of the driving cylinder remains fixed relative to the slide rail (for example, the cylinder body of the driving cylinder and the slide rail are installed on the ground), and the piston rod of the driving cylinder is connected to the carrying platform 2; a notch is provided at the lower end of the gate 12, and the notch is used to avoid the slide rail and the piston rod of the driving cylinder; a sealing structure is provided between the notch and the slide rail, and between the notch and the piston rod.

[0062] Reference Figure 1 and Figure 2 The carrying platform 2 includes a bottom plate 21 , a limiting rod 22 and a supporting block 23 .

[0063] The bottom plate 21 is horizontal and connected to the driving device. The bottom plate 21 is provided with a limiting hole 211 and a through hole 212. The limiting hole 211 and the through hole 212 both penetrate the bottom plate 21 vertically. The limiting hole 211 is located in the middle area of ​​the bottom plate 21, and two limiting holes 211 are provided. The length direction of the limiting hole 211 is perpendicular to the moving direction of the carrying platform 2. The horizontal cross-sectional area of ​​the limiting hole 211 decreases from top to bottom.

[0064] Two supporting blocks 23 are provided corresponding to the limiting holes 211. The supporting blocks 23 are vertically slidably embedded in the limiting holes 211. The supporting blocks 23 are used to support the pipe material. When the supporting blocks 23 fit the inner wall of the limiting holes 211, the lower end of the supporting blocks 23 extends downward from the limiting holes 211. The surface of the supporting blocks 23 away from the furnace body 11 is inclined from top to bottom toward the furnace body 11.

[0065] There are four through holes 212 , and the four through holes 212 are respectively located at four corners of the bottom plate 21 .

[0066] Four limiting rods 22 are provided corresponding to the through holes 212. The limiting rods 22 are vertical, and the limiting rods 22 are vertically slidably embedded in the through holes 212. The limiting rods 22 are used to touch the outer peripheral surface of the pipe to prevent the pipe from escaping from the supporting block 23.

[0067] An abutment block 24 is connected to the outer periphery of the limiting rod 22 , and the abutment block 24 is located above the bottom plate 21 .

[0068] Reference Figure 1 The tube heat treatment vacuum annealing furnace also includes a guide rail 31 , a support rail 32 and a moving rail 33 .

[0069] The guide rail 31 is located outside the furnace body 11. The guide rail 31 is lifted as it approaches the furnace body 11. The guide rail 31 is used for the lower surface of the abutment block 24 to touch. When the abutment block 24 touches the highest point of the guide rail 31, the limit rod 22 is located at the highest position.

[0070] The support rail 32 is located in the furnace body 11, and the support rail 32 is flush with the highest point of the guide rail 31. The support rail 32 is used for the lower surface of the abutment block 24 to touch. There is a gap between the support rail 32 and the guide rail 31, and the gap is used to avoid the gate 12.

[0071] The movable rail 33 is connected to the gate 12 . The movable rail 33 is used to be connected between the guide rail 31 and the support rail 32 .

[0072] Reference Figure 1 and Figure 3 The vacuum annealing furnace for heat treatment of pipes further comprises an adjusting structure 4. The adjusting structure 4 is located outside the furnace body 11. The adjusting structure 4 is used to adjust the height of the limit rod 22 according to the height of the support block 23, and the adjusting structure 4 is used to make the moving direction of the limit rod 22 opposite to the moving direction of the support block 23.

[0073] Reference Figure 3 and Figure 4 The adjusting structure 4 includes a base 41 , a pressure block 42 , an elastic member 43 , a lifting rod 44 and a transmission member 45 .

[0074] The upper surface of the base 41 is not higher than the lower surface of the bottom plate 21 .

[0075] The pressure block 42 is vertically slidably connected to the base 41 , and the upper end of the pressure block 42 is used to contact the lower end of the supporting block 23 .

[0076] The elastic member 43 is connected between the base 41 and the pressure block 42 , and the elastic force of the elastic member 43 on the pressure block 42 is upward.

[0077] The lifting rod 44 is connected to the base 41 in a vertical sliding manner, and the upper end of the lifting rod 44 is used to touch the lower end of the limiting rod 22 .

[0078] The transmission member 45 is used to make the moving direction of the pressure block 42 opposite to the moving direction of the lifting rod 44 .

[0079] In one embodiment: the transmission member 45 includes liquid; the base 41 is provided with a sealed cavity 411, the lower end of the pressure block 42 is used to extend into the sealed cavity 411, and the lower end of the lifting rod 44 is used to extend into the sealed cavity 411; the transmission member 45 (liquid) fills the sealed cavity 411; the ratio between the moving distance of the pressure block 42 and the moving distance of the lifting rod 44 is controlled by controlling the horizontal cross-sectional area of ​​the pressure block 42 and the horizontal cross-sectional area of ​​the lifting rod 44.

[0080] In another embodiment: the transmission member 45 includes a driving wheel and a driven wheel that are coaxially fixedly connected; the driving wheel is rotatably connected to the base 41, the outer periphery of the driving wheel rolls against the pressure block 42, and the outer periphery of the driven wheel rolls against the lifting rod 44; the ratio between the moving distance of the pressure block 42 and the moving distance of the lifting rod 44 is controlled by controlling the ratio of the diameters of the driving wheel and the driven wheel.

[0081] It should be noted that: the base 41 is provided with an avoidance groove 412, the avoidance groove 412 penetrates the base 41 upward, and the avoidance groove 412 penetrates the base 41 along the moving direction of the carrying platform 2, and the avoidance groove 412 is used for the limit rod 22 to pass through, and the upper end of the lifting rod 44 can extend upward into the avoidance groove 412. In the case where the transmission member 45 includes liquid, the groove bottom of the avoidance groove 412 is provided with a through hole 413, and the through hole 413 connects the avoidance groove 412 and the sealing chamber 411, and the outer periphery of the lifting rod 44 is slidably sealed with the through hole 413, and the opening of the through hole 413 is smaller than the notch of the avoidance groove 412.

[0082] The implementation principle of a vacuum annealing furnace for heat treatment of pipes in the embodiment of the present application is as follows:

[0083] When the carrying platform 2 is located outside the furnace body 11, the supporting block 23 is located directly above the pressure block 42, and the limiting rod 22 is located directly above the lifting rod 44, the limiting rod 22 moves down to the lowest position due to its own weight;

[0084] The pipe is placed on the carrying platform 2, and the supporting block 23 supports the pipe. The weight of the pipe acts on the supporting block 23 and the pressure block 42. The pressure block 42 is also subjected to the elastic force of the elastic member 43. Based on the balancing force, the more pipes there are, the greater the elastic deformation of the elastic member 43 is, and the lower the height of the pressure block 42 is. Then, the limit rod 22 is raised higher through the transmission member 45 and the lifting rod 44, and the limit rod 22 is used to prevent the pipe from leaving the supporting block 23.

[0085] After the pipe transfer is completed, the driving device drives the carrying platform 2 to move into the furnace body 11. As the carrying platform 2 approaches the furnace body 11, the abutment block 24 touches the guide rail 31, so that the limit rod 22 rises to the highest position, and the abutment block 24 moves to the support rail 32 via the moving rail 33;

[0086] The gate 12 is closed, the movable rail 33 is separated from the guide rail 31 and the support rail 32, and the gate 12 closes the opening of the furnace body 11;

[0087] During the annealing process, the vacuum device 13 is used to extract the gas in the furnace body 11: the oxygen content in the furnace body 11 is reduced, and the oxidation of the pipe is reduced; during the vacuuming process, the gas flow (heat convection) in the furnace body 11 is promoted, which is conducive to the uniform temperature in the furnace body 11; after the vacuuming is completed, the gas content in the furnace body 11 is reduced, the influence of the gas on the heat transfer is reduced, and the temperature in the furnace body 11 is uniform;

[0088] Meanwhile, during the annealing process, the carrying platform 2 can move within the furnace body 11, which is beneficial for the uniform heating of the tubes and improves the uniformity of the tube annealing.

[0089] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vacuum annealing furnace for heat treatment of pipes, characterized in that: It comprises a furnace body (11), a gate (12), a carrying platform (2) and a vacuum pumping device (13), The furnace body (11) has an opening, The gate (12) is movably connected to the furnace body (11), and the gate (12) is used to close the opening. The carrying platform (2) is used to support the tubes, and the carrying platform (2) is used to move inside and outside the furnace body (11). The vacuum extraction device (13) is used to extract the gas in the furnace body (11); The carrying platform (2) comprises a bottom plate (21) and a limiting rod (22). The bottom plate (21) is used to support the pipe material. The limiting rod (22) is vertical, and the limiting rod (22) is connected to the bottom plate (21) in a vertical sliding direction. A plurality of limiting rods (22) are provided, and the limiting rods (22) are used to contact the outer peripheral surface of the pipe; It comprises an adjustment structure (4), the carrying platform (2) comprises a supporting block (23), The supporting block (23) is vertically slidably connected to the bottom plate (21), and the supporting block (23) is used to support the pipe material. The adjusting structure (4) is used to adjust the height of the limiting rod (22) according to the height of the supporting block (23), and the adjusting structure (4) is used to make the moving direction of the limiting rod (22) opposite to the moving direction of the supporting block (23); The adjustment structure (4) comprises a base (41), a pressure block (42), an elastic member (43), a lifting rod (44) and a transmission member (45). The upper surface of the base (41) is not higher than the lower surface of the bottom plate (21). The pressure block (42) is vertically slidably connected to the base (41), and the upper end of the pressure block (42) is used to contact the supporting block (23). The elastic member (43) is connected between the base (41) and the pressure block (42), and the elastic force of the elastic member (43) on the pressure block (42) is directed upward. The lifting rod (44) is vertically slidably connected to the base (41), and the upper end of the lifting rod (44) is used to contact the limit rod (22). The transmission member (45) is used to make the moving direction of the pressure block (42) opposite to the moving direction of the lifting rod (44); The base (41) is provided with a sealed cavity (411), the lower end of the pressure block (42) is used to extend into the sealed cavity (411), the lower end of the lifting rod (44) is used to extend into the sealed cavity (411), the transmission member (45) is located in the sealed cavity (411), and the transmission member (45) includes liquid.

2. The vacuum annealing furnace for heat treatment of pipes according to claim 1, characterized in that: The horizontal cross-sectional area of ​​the supporting block (23) decreases from top to bottom, the bottom plate (21) is provided with a limiting hole (211), and the supporting block (23) is located in the limiting hole (211).

3. The vacuum annealing furnace for heat treatment of pipes according to claim 2, characterized in that: The surface of the supporting block (23) facing away from the furnace body (11) is inclined from top to bottom in a direction approaching the furnace body (11).

4. The vacuum annealing furnace for heat treatment of pipes according to claim 1, characterized in that: It comprises a guide rail (31) and a support rail (32), The guide rail (31) is connected to the base (41), and the guide rail (31) rises as it approaches the furnace body (11). The support rail (32) is located in the furnace body (11), and the support rail (32) is flush with the highest point of the guide rail (31). The carrying platform (2) comprises an abutment block (24), The abutment block (24) is connected to the limiting rod (22), and the lower surface of the abutment block (24) is used to contact the guide rail (31) and the support rail (32). When the abutment block (24) contacts the highest point of the guide rail (31), the limiting rod (22) is located at the highest position.

5. The vacuum annealing furnace for heat treatment of pipes according to claim 1, characterized in that: including a moving rail (33), The movable rail (33) is slidably connected to the furnace body (11), and the movable rail (33) is used to connect between the guide rail (31) and the support rail (32). The distance between the guide rail (31) and the support rail (32) is used to avoid the gate (12).

6. The vacuum annealing furnace for heat treatment of pipes according to claim 5, characterized in that: The movable rail (33) is connected to the gate (12).

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