A large shaft furnace

Abstract

The utility model provides a large -scale well type furnace, including furnace body, furnace cover, portal frame mechanism, furnace cover includes big furnace cover and small furnace cover, portal frame mechanism includes portal frame and is used for opening / closing big furnace cover's first lifting assembly and is used for opening / closing small furnace cover's second lifting assembly who sets up in portal frame, the bottom of furnace body is equipped with rotary hearth and the drive support component of drive rotary hearth rotation. This large -scale well type furnace design furnace cover adopts the combination form of big furnace cover and small furnace cover, can realize same one furnace can be applicable to the production of large -scale workpiece, can also batch processing small diameter workpiece, has improved the scope of application and production efficiency, and big furnace cover and small furnace cover's opening / closing adopt same portal frame mechanism to realize, has reduced the floor area, and for small diameter workpiece adopts small furnace cover to carry out single workpiece and take, reduces the heat loss, saves the cost, simultaneously because rotary hearth rotates, can also promote the evenness of furnace atmosphere circulation and furnace temperature evenness.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat treatment equipment, specifically relating to a large pit furnace. Background Technology

[0002] Large pit furnaces are periodic operation heat treatment equipment suitable for heat treatment of large parts such as rods and long shafts. They are characterized by high efficiency, energy saving, and good temperature uniformity, and are widely used in machining, automobile manufacturing, aerospace and other fields.

[0003] Currently, the main problems with large pit furnaces are as follows: 1. Due to their large diameter, the furnace temperature uniformity and atmosphere uniformity are poor; 2. They are suitable for large batches of large workpieces, but have low efficiency and high energy consumption for small batches or small parts. Utility Model Content

[0004] The purpose of this invention is to provide a large-scale pit furnace that can at least solve some of the defects existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A large pit furnace includes a furnace body and a furnace cover, and also includes a gantry mechanism for opening the furnace cover. The furnace cover includes a large furnace cover and a small furnace cover disposed on the large furnace cover. The gantry mechanism includes a gantry and a first lifting component for opening / closing the large furnace cover and a second lifting component for opening / closing the small furnace cover disposed on the gantry. The bottom of the furnace body is provided with a rotating bottom for carrying small-diameter workpiece fixtures and a drive support component for driving the rotating bottom to rotate around the center of the furnace body.

[0006] Furthermore, the small furnace cover is eccentrically arranged on the large furnace cover.

[0007] Furthermore, the first lifting assembly includes a support plate slidably disposed on the columns on both sides of the gantry frame, and a first driving member for driving the support plate to move up and down along the columns of the gantry frame; the support plate is located outside the furnace body and below the large furnace cover, and the projection of the large furnace cover in the vertical direction at least partially covers the support plate.

[0008] Furthermore, the second lifting assembly includes a second driving component, a chain, and a guide sprocket. The second driving component and the guide sprocket are mounted on the crossbeam of the gantry frame. There are two chains, one end of which is fixedly connected to the small furnace cover, and the other end of which is connected to the movable end of the second driving component via the guide sprocket.

[0009] Furthermore, the top of the large furnace cover is provided with a guide component to guide the lifting and lowering movement of the small furnace cover.

[0010] Furthermore, the gantry is connected to a large furnace cover drag chain for introducing cables and water / gas pipes into the large furnace cover, and a small furnace cover drag chain for introducing cables and water / gas pipes into the small furnace cover.

[0011] Furthermore, the drive support assembly includes a third drive component and a furnace bottom support. The bottom of the rotating bottom is supported on the furnace bottom support, and the movable end of the third drive component is connected to the furnace bottom support to drive the furnace bottom support to rotate the rotating bottom around the center of the furnace body.

[0012] Furthermore, a sealing element is provided between the rotating bottom and the bottom of the furnace body.

[0013] Furthermore, the furnace cover is also equipped with several high-temperature fans, and the furnace cover is equipped with air guide covers corresponding to the high-temperature fans.

[0014] Furthermore, the furnace body includes a furnace shell, a furnace lining, and a heating element. The large furnace cover is sealed to the furnace shell. The furnace lining is disposed inside the furnace shell and the furnace cover. The heating element is disposed on the furnace lining.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The large pit furnace provided by this utility model adopts a combination of a large furnace cover and a small furnace cover, which can be used to handle workpieces of different diameters. It can be used for the production of large workpieces and the batch processing of small diameter workpieces in the same furnace, which greatly improves production efficiency. Moreover, the opening / closing of the large furnace cover and the small furnace cover are realized by the same gantry mechanism, which reduces the footprint of the large pit furnace. Furthermore, the use of the small furnace cover for individual handling of small diameter workpieces can reduce the lifting weight of the crane and reduce heat loss, thus saving costs. At the same time, the rotation of the bottom can also promote the uniformity of atmosphere circulation and furnace temperature in the furnace.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the large pit furnace of this utility model; Figure 2 This is a cross-sectional schematic diagram of the furnace body in an embodiment of this utility model; Figure 3 This is a schematic diagram of the arrangement of large-diameter workpieces inside the furnace in an embodiment of this utility model; Figure 4 This is a schematic diagram of the arrangement of small-diameter workpieces inside the furnace in an embodiment of this utility model; Figure 5 This is a schematic diagram of the opening of the large furnace cover and the small furnace cover in an embodiment of this utility model; Figure 6This is a schematic diagram of the second lifting component opening the small furnace cover in an embodiment of this utility model; Figure 7 This is a schematic diagram of the installation of the rotating bottom and drive support components in an embodiment of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Furnace body; 2. Large furnace cover; 3. Small furnace cover; 4. First lifting assembly; 5. Gantry frame; 6. Second lifting assembly; 7. High-temperature fan; 8. Air guide cover; 9. Rotating bottom; 10. Drive support assembly; 11. Furnace shell; 12. Furnace lining; 13. Heating element; 14. Large-diameter workpiece; 15. Small-diameter workpiece fixture; 16. First drive component; 17. Small furnace cover drag chain; 18. Pallet; 19. Large furnace cover drag chain; 20. Second drive component; 21. Chain; 22. Guide sprocket; 23. Third drive component; 24. Furnace bottom support; 25. Sealing component; 26. Center positioning component. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, abutting connections, or integral connections. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this utility model, unless otherwise stated, "a plurality of" or "several" means two or more.

[0023] like Figures 1 to 4 As shown, this embodiment provides a large pit furnace, including a furnace body 1 and a furnace cover, and also includes a gantry mechanism for opening the furnace cover. The furnace cover includes a large furnace cover 2 and a small furnace cover 3 disposed on the large furnace cover 2. The gantry mechanism includes a gantry 5 and a first lifting component 4 disposed on the gantry 5 for opening / closing the large furnace cover 2 and a second lifting component 6 disposed on the gantry 5 for opening / closing the small furnace cover 3. The bottom of the furnace body 1 is provided with a rotating bottom 9 for carrying a small diameter workpiece fixture 15 and a drive support component 10 for driving the rotating bottom 9 to rotate around the central axis of the furnace body 1.

[0024] In this embodiment, when the large-diameter workpiece 14 is processed using the large pit furnace, the first lifting component 4 of the gantry mechanism lifts the large furnace cover 2 together with the small furnace cover 2, and then places the large-diameter workpiece 14 directly on the evenly distributed wing beams inside the furnace body 1. The first lifting component 4 then resets the large furnace cover 2 together with the small furnace cover 3 and places it back on the furnace body 1, completing the loading process of the large-diameter workpiece 14. The loading and unloading of the large-diameter workpiece 14 can be directly grabbed and hoisted by a lifting device. When processing small-diameter workpieces using this large pit furnace, the small-diameter workpieces are loaded using tooling. The second lifting component 6 of the gantry mechanism is used to open the small furnace cover 3. At this time, the large furnace cover 2 and the furnace body 1 are kept in a sealed connection. The small-diameter workpieces are placed on the rotating bottom 9 inside the furnace body 1 at the open position of the small furnace cover 3. Then, the drive support component 10 drives the rotating bottom 9 to rotate one position. Then, the next set of small-diameter workpieces is placed at the open position of the small furnace cover 3. The drive support component 10 drives the rotating bottom 9 to rotate one position again. This process is repeated until the furnace chamber is full of small-diameter workpieces. The small furnace cover 3 is then closed, completing the loading process of small-diameter workpieces inside the furnace body 1. The small-diameter workpieces can be fed by using an overhead crane to place the tooling containing the small-diameter workpieces into the furnace. Of course, the small furnace cover 3 can also be closed at any time after each placement or lifting of the small-diameter workpiece tooling 15 to reduce heat loss. In this embodiment, the large pit furnace adopts a combination of a large furnace cover 2 and a small furnace cover 3, which can be used to handle workpieces of different diameters. This allows for the production of both large and small diameter workpieces within the same furnace, greatly improving production efficiency. Furthermore, the opening and closing of the large and small furnace covers is achieved using the same gantry mechanism, reducing the footprint of the large pit furnace. Additionally, using the small furnace cover for individual handling of small diameter workpieces reduces the lifting weight of the overhead crane and minimizes heat loss, saving costs. Moreover, the rotating bottom promotes uniformity of atmosphere circulation and furnace temperature within the furnace.

[0025] Detailed implementation methods, such as Figure 2 As shown, the furnace body 1 includes a furnace shell 11, a furnace lining 12, and a heating element 13. The large furnace cover 2 is sealed to the furnace shell 11. The furnace shell 11 and the furnace cover (including the large furnace cover 2 and the small furnace cover 3) are both equipped with the furnace lining 12. The heating element 13 is hung on the furnace lining 12.

[0026] Preferably, the large furnace cover 2 is also provided with several high-temperature fans 7, which can realize the circulation of furnace gas inside the furnace body 1 through the high-temperature fans 7, further ensuring the uniformity of the furnace atmosphere circulation and the uniformity of furnace temperature; the large furnace cover 2 is provided with an air guide cover 8 corresponding to the high-temperature fans 7 to reduce furnace gas short circuit.

[0027] Furthermore, the small furnace cover 3 is eccentrically arranged on the large furnace cover 2, and the high-temperature fan 7 and the small furnace cover 3 are distributed at equal intervals along the circumference of the large furnace cover 2.

[0028] Regarding the specific implementation of using the gantry mechanism to open / close the large furnace cover 2 and the small furnace cover 3, in some embodiments, such as Figure 5 As shown, the first lifting assembly 4 includes a support plate 18 slidably mounted on the columns on both sides of the gantry frame 5, and a first driving member 16 that drives the support plate 18 to move up and down along the columns of the gantry frame 5. The support plate 18 is located outside the furnace body 1 and below the large furnace cover 2, and the projection of the large furnace cover 2 in the vertical direction at least partially covers the support plate 18. When it is necessary to load / unload a large-diameter workpiece 14, the first driving member 16 drives the support plate 18 to rise to support the edge of the large furnace cover 2. The first driving member 16 continues to drive the support plate 18 to rise, so that the support plate 18 supports the large furnace cover 2 and rises together. The large furnace cover 2 is separated from the furnace body 1 until it is in the open position. Then the gantry frame 5 drives the large furnace cover 2 to move horizontally. During this process, the small furnace cover 3 moves together with the large furnace cover 2. After the large furnace cover 2 is opened, loading / unloading operations can be performed inside the furnace body 1. Specifically, the first driving component 16 can be any existing mechanical transmission structure that can drive the pallet 18 to move up and down on the column of the gantry 5; in this embodiment, the first driving component 16 is driven by a chain and sprocket structure.

[0029] In some embodiments, such as Figure 5 and Figure 6 As shown, the second lifting assembly 6 includes a second driving component 20, a chain 21, and a guide sprocket 22. The second driving component 20 and the guide sprocket 22 are mounted on the crossbeam of the gantry frame 5. There are two chains 21, one end of which is fixedly connected to the small furnace cover 3, and the other end of which is connected to the movable end of the second driving component 20 via the guide sprocket 22. The two chains 21 are symmetrically connected to the left and right sides of the small furnace cover 3 to ensure the stability of the lifting and lowering movement of the small furnace cover 3. When it is necessary to load / unload small diameter workpieces, the large furnace cover 2 is in the closed position (i.e., sealed to the furnace body 1). The second driving component 20 operates to drive the chain 21 to move, and the chain 21 pulls the small furnace cover 3 upward to the open position. The gantry frame 5 drives the small furnace cover 3 to move horizontally. During this process, the large furnace cover 2 always remains sealed to the furnace body 1, and the furnace cover is not fully opened, which can effectively reduce the heat loss inside the furnace and save production costs. In this embodiment, the second driving component 20 may include, but is not limited to, a drive motor; of course, in this embodiment, the second lifting component 6 may also adopt a telescopic rod structure to replace the chain 21 and guide sprocket 22 in this embodiment to achieve the purpose of driving the small furnace cover 3 to move up and down.

[0030] In an optimized configuration, the top of the large furnace cover 2 is provided with a guide (not shown in the figure) to guide the lifting and lowering movement of the small furnace cover 3. The guide can ensure the stability of the lifting and lowering movement of the small furnace cover 3, and can also play a positioning role in the relative position of the small furnace cover 3 and the large furnace cover 2 when the small furnace cover 3 is closed, thereby improving the accuracy and efficiency of closing the small furnace cover 3.

[0031] Preferably, the gantry frame 5 is connected to a large furnace cover drag chain 19 for introducing cables and water / gas pipes into the large furnace cover 2, and a small furnace cover drag chain 17 for introducing cables and water / gas pipes into the small furnace cover 3.

[0032] In a specific implementation of the rotating bottom 9, the rotating bottom 9 is located at the bottom of the furnace body 1 and is used to support the small-diameter workpiece fixture 15, while the drive support assembly 10 is located outside the furnace body 1; in some embodiments, such as Figure 7 As shown, the drive support assembly 10 includes a third drive component 23 and a furnace bottom support 24. The bottom of the rotating base 9 is supported on the furnace bottom support 24. The movable end of the third drive component 23 is connected to the furnace bottom support 24 to drive the furnace bottom support 24 to rotate the rotating base 9 around the central axis of the furnace body 1. Optionally, the furnace bottom support 24 includes an annular wheel track, several sets of wheels, and a gear ring arranged sequentially from bottom to top. The bottom of the rotating base 9 is fixedly connected to the gear ring through a connector. The movable end of the third drive component 23 is engaged with the gear ring for transmission, driving the gear ring to move, thereby driving the wheels to rotate on the wheel track, realizing the rotation of the rotating base 9. The third drive component 23 may be, but is not limited to, a drive motor.

[0033] Preferably, the drive support assembly 10 further includes a center positioning element 26 to ensure that the rotating bottom 9 rotates around the central axis of the furnace body 1; specifically, the center positioning element 26 can adopt a slewing bearing structure.

[0034] Furthermore, a sealing element 25 is provided between the rotating bottom 9 and the bottom of the furnace body 1 to ensure that the furnace gas and heat inside the furnace body 1 will not leak out during the rotation of the rotating bottom 9.

[0035] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A large pit-type furnace, comprising a furnace body and a furnace cover, characterized in that: It also includes a gantry mechanism for opening the furnace cover, the furnace cover including a large furnace cover and a small furnace cover disposed on the large furnace cover, the gantry mechanism including a gantry and a first lifting assembly disposed on the gantry for opening / closing the large furnace cover and a second lifting assembly disposed on the gantry for opening / closing the small furnace cover, and the bottom of the furnace body is provided with a rotating bottom for carrying small diameter workpiece fixtures and a drive support assembly for driving the rotating bottom to rotate around the center of the furnace body.

2. The large-scale pit furnace as described in claim 1, characterized in that: The small furnace cover is eccentrically arranged on the large furnace cover.

3. The large-scale pit furnace as described in claim 1, characterized in that: The first lifting assembly includes a support plate slidably disposed on the columns on both sides of the gantry frame, and a first driving member for driving the support plate to move up and down along the columns of the gantry frame; the support plate is located outside the furnace body and below the large furnace cover, and the projection of the large furnace cover in the vertical direction at least partially covers the support plate.

4. The large pit furnace as described in claim 1, characterized in that: The second lifting assembly includes a second driving component, a chain, and a guide sprocket. The second driving component and the guide sprocket are mounted on the crossbeam of the gantry frame. There are two chains, one end of which is fixedly connected to the small furnace cover, and the other end of which is connected to the movable end of the second driving component via the guide sprocket.

5. The large pit furnace as described in claim 4, characterized in that: The top of the large furnace cover is equipped with a guide component to guide the lifting and lowering movement of the small furnace cover.

6. The large pit furnace as described in claim 1, characterized in that: The gantry is connected to a large furnace cover drag chain for introducing cables and water / gas pipes to the large furnace cover, and a small furnace cover drag chain for introducing cables and water / gas pipes to the small furnace cover.

7. The large pit furnace as described in claim 1, characterized in that: The drive support assembly includes a third drive component and a furnace bottom support. The bottom of the rotating bottom is supported on the furnace bottom support. The movable end of the third drive component is connected to the furnace bottom support to drive the furnace bottom support to rotate the rotating bottom around the center of the furnace body.

8. The large pit furnace as described in claim 7, characterized in that: A sealing element is provided between the rotating bottom and the bottom of the furnace body.

9. The large-scale pit furnace as described in claim 1, characterized in that: The furnace cover is also equipped with several high-temperature fans, and an air guide cover is provided on the furnace cover corresponding to the high-temperature fans.

10. The large pit furnace as described in claim 1, characterized in that: The furnace body includes a furnace shell, a furnace lining, and heating elements. The large furnace cover is sealed to the furnace shell. The furnace lining is disposed inside the furnace shell and the furnace cover. The heating elements are disposed on the furnace lining.

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