Furnace door assembly for box-type furnace

Abstract

The utility model discloses a furnace door assembly for a box-type furnace. The furnace door assembly comprises a hook arranged on a furnace body, a lever arranged on a furnace door, a fixed shaft arranged in the middle of the lever and a U-shaped pull rod, wherein one end of the U-shaped pull rod is arranged on the fixed shaft; the lever comprises a short rod and a long rod; one end of the short rod is rotationally connected with the furnace door, and the other end of the short rod is provided with the fixed shaft; a round hole is formed in one end of the long rod; a narrow groove is formed in the inner wall of the round hole, a flat column is arranged on the periphery of the fixing shaft, and the flat column is selectively inserted into the narrow groove. The device is compact in structure, good in sealing performance, easy to operate, convenient to use and maintain, good in heat insulation effect, attractive in real object and suitable for various furnace bodies. The locking process of the U-shaped pull rod is more labor-saving and convenient due to the outwards-extending lever, the outwards-extending length of the lever is reduced due to the fact that the lever can be folded and stored, and the situation that the sealing effect fails due to the fact that the lever extending outside is opened by mistaken touch is avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of sintering equipment, and in particular relates to a furnace door assembly for a box furnace. Background Technology

[0002] An atmosphere box furnace is a device used for atmosphere sintering experiments of materials. It is applied in laboratories of universities and colleges, as well as industrial and mining enterprises, for chemical analysis, physical measurement, and heating, roasting, drying, and heat treatment of materials. The size of the furnace body will vary according to actual requirements, and the size and structure of the furnace door assembly will be affected.

[0003] Chinese patent document CN211041823U discloses a furnace door opening mechanism for a box-type furnace, including a furnace body. A furnace door is located on the front end of the furnace body. A hinge seat is located on one side of the front end of the furnace body, and a connecting rod is hinged to the hinge seat. A rotary bearing is located at the other end of the connecting rod, and a rotating shaft is located inside the rotary bearing. The other end of the rotating shaft is fixedly connected to the middle of the furnace door. By setting a hinge seat on the front end of the furnace body, hinged to the connecting rod, and connecting the other end of the connecting rod to the middle of the furnace door via the rotating shaft, the furnace door can be completely rotated 180 degrees when opened, so that the inner wall of the furnace door faces the outer side of the furnace door. This improves the heat dissipation efficiency of the box-type furnace. Simultaneously, after the furnace door is opened, it does not need to face the operator directly, avoiding the operator being affected by the heat from the inner wall of the furnace door.

[0004] Atmosphere box furnaces require good sealing of the furnace door and furnace body. Therefore, the fit between the furnace door and furnace body is small or an interference fit. Thus, when using the furnace door locking method in the above-mentioned patented solution, it is necessary to keep the furnace door pressed against the furnace body on the one hand, and to align and operate the mechanical lock on the other hand. Therefore, the process of opening and closing the door is relatively laborious and inconvenient for manual operation. Utility Model Content

[0005] To overcome the technical problems of inconvenience and laborious operation when locking the furnace door and furnace body in the prior art, one objective of this utility model is to provide a furnace door assembly for a box-type furnace. By rotatably connecting one end of a lever to the furnace door, and setting a U-shaped pull rod in the middle of the lever for locking with a hook on the furnace body, the lever achieves the purpose of saving effort and facilitating operation. At the same time, in order to avoid the risk of the furnace door being loosened by accidental activation due to an excessively long lever, the lever is designed to be foldable and stored, further ensuring the sealing effect of the furnace body.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a furnace door assembly for a box-type furnace, comprising an even number of quick-clamping assemblies symmetrically arranged between the furnace door and the furnace body; each quick-clamping assembly includes a hook disposed on the furnace body, at least one lever disposed on the furnace door, a fixed shaft disposed in the middle of the lever, and a U-shaped pull rod with one end disposed on the fixed shaft; the other end of the U-shaped pull rod can be selectively hung on the hook; wherein, the lever includes a short rod and a long rod; one end of the short rod is rotatably connected to the furnace door, and the other end is disposed on the fixed shaft; one end of the long rod is provided with a circular hole, and the fixed shaft is located in the circular hole; the inner wall of the circular hole is provided with a narrow groove, the width of which is smaller than the diameter of the circular hole; a flat column is provided on the outer periphery of the fixed shaft, and the flat column can be selectively inserted into the narrow groove.

[0007] When the flat column is located within the narrow groove, the long rod and the short rod rotate synchronously, pulling the U-shaped tie rod tight onto the hook. This eliminates the need to maintain the furnace door's tightness and, through leverage, makes operation easier. When the flat column is located within the circular hole, the long rod rotates relative to the short rod, folding the long rod horizontally towards the furnace door. This prevents the long rod from being accidentally touched, thus avoiding loosening of the seal.

[0008] Furthermore, the furnace door includes a furnace door panel, a furnace door cover weldment disposed on one side of the furnace door panel, a liner weldment disposed on the other side of the furnace door panel, and a foam ceramic plate disposed within the liner weldment; the liner weldment is provided with a frame-shaped fixing strip for fixing the foam ceramic plate; a plurality of expansion joints are evenly disposed on the fixing strip facing the foam ceramic plate.

[0009] The expansion joint reduces the deformation caused by the thermal expansion of the fixing strip, thereby increasing the stability of the structure.

[0010] Specifically, the lever includes two short rods and two long rods; the short rods are respectively disposed at both ends of the fixed shaft; and a mounting shaft is disposed between the two long rods, the mounting shaft being located at the end away from the short rods.

[0011] Specifically, the U-shaped tie rod is formed by bending both ends of a straight rod at ninety degrees; both ends of the fixed shaft are provided with through holes; and both ends of the straight rod are located in the corresponding through holes.

[0012] Optionally, both ends of the straight rod are respectively provided with threads; both ends of the straight rod are respectively threaded with adjusting screws.

[0013] Optionally, the two ends of the straight rod are bent and abut against the two ends of the fixed shaft.

[0014] The relative positions of the U-shaped tie rod and the fixed shaft can be adjusted according to the actual situation, that is, different locking distances can be adjusted, which can be applied to furnace door structures of various sizes, and can achieve better sealing, heat insulation and aesthetic effects.

[0015] Furthermore, a plurality of screws are evenly arranged on the side of the liner weldment away from the furnace door plate; the foam ceramic plate is disposed on the screws; a ceramic nut is threaded onto the screw; and a countersunk hole for accommodating the ceramic nut is provided on the foam ceramic plate.

[0016] Furthermore, an asbestos pad is provided between the furnace door panel and the lining weldment.

[0017] Furthermore, a groove is provided on the side of the furnace door panel facing the foam ceramic plate near the outer periphery; an asbestos packing sealing ring is provided in the groove; and the fixing strip is located inside the asbestos packing sealing ring.

[0018] Specifically, fixing blocks are respectively provided at the middle of the upper and lower ends of the furnace door; a support arm is provided between the fixing block and the furnace body; corner brackets are symmetrically provided on the left and right sides of the furnace door, and the quick clamping assembly is provided on the corner brackets.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. This utility model has a compact structure, good sealing performance, simple operation, convenient use and maintenance, good heat insulation effect, and beautiful appearance. It can be applied to various furnace bodies.

[0021] 2. By adopting a lever-type quick-clamp assembly, the extended lever makes the locking process of the U-shaped pull rod more effortless and convenient. At the same time, the foldable and retractable lever reduces the extension length of the lever, preventing the extended lever from being accidentally opened and causing the sealing effect to fail. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the front structure of the furnace door of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the back of the furnace door of this utility model;

[0024] Figure 3 This is a schematic diagram of the quick clamp assembly of this utility model;

[0025] Figure 4 This is a schematic diagram of the lever mounting structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the lever structure of this utility model;

[0027] Figure 6 This is an exploded view of the lever of this utility model.

[0028] In the diagram: 1. Furnace door panel; 11. Asbestos packing seal ring; 12. Angle seat weldment; 13. Fixing block; 2. Furnace door cover weldment; 3. Liner weldment; 4. Foam ceramic board; 41. Countersunk hole; 5. Fixing strip; 51. Expansion joint; 6. Quick clamp assembly; 61. Mounting base; 62. Rotating shaft; 63. Fixing shaft; 64. Mounting shaft; 65. Spacer; 66. Lever; 661. Short rod; 6611. Flat column; 662. Long rod; 6621. Narrow groove; 6622. Round hole; 67. Bearing; 68. U-shaped tie rod; 7. Ceramic nut; 8. Handle. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] In the description of this utility model, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are 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. They should not be construed as limiting the specific protection scope of this utility model.

[0031] Furthermore, 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. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In this description of the utility model, "a number" means two or more, unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, terms such as "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] See Figures 1-6 A furnace door assembly for a box furnace includes a furnace body, a furnace door, and four quick-clamping assemblies 6 symmetrically arranged between the furnace door and the furnace body.

[0034] The furnace door includes a furnace door panel 1, a furnace door cover weldment 2 disposed on the side of the furnace door panel 1 away from the furnace body, a lining weldment 3 disposed on the side of the furnace door panel 1 facing the furnace body, a foam ceramic board 4 disposed within the lining weldment 3, and a frame-shaped fixing strip 5 disposed on the lining weldment 3 for fixing the foam ceramic board 4; a plurality of expansion joints 51 are evenly disposed on the side of the fixing strip 5 facing the foam ceramic board 4; a handle 8 is disposed at the center of the side of the furnace door cover weldment 2 away from the furnace door panel 1.

[0035] The liner weldment 3 has six screws evenly arranged on the side away from the furnace door plate 1; the foam ceramic plate 4 is disposed on the screws; a ceramic nut 7 is threaded onto the screws; and the foam ceramic plate 4 is provided with a countersunk hole 41 for accommodating the ceramic nut 7.

[0036] An asbestos gasket is provided between the furnace door panel 1 and the lining weldment 3. A groove is provided on the side of the furnace door panel 1 facing the foam ceramic board 4 near the outer periphery; an asbestos packing sealing ring 11 is provided in the groove; and the fixing strip 5 is located inside the asbestos packing sealing ring 11.

[0037] Fixing blocks 13 are respectively provided at the middle of the upper and lower ends of the furnace door panel 1; a support arm is provided between the fixing block 13 and the furnace body; two corner seat weldments 12 are symmetrically provided on the left and right sides of the furnace door panel 1, and the quick clamping assembly 6 is provided on the corner seat weldment 12.

[0038] The quick clamp assembly 6 includes a hook on the furnace body, two levers 66 on the furnace door panel 1, a fixed shaft 63 in the middle of the levers 66, and a U-shaped pull rod 68 with one end on the fixed shaft 63; the other end of the U-shaped pull rod 68 can be selectively hung on the hook.

[0039] Two mounting seats 61 are respectively provided on the left and right sides of the furnace door panel 1; bearings 67 are respectively provided at the upper and lower ends of each mounting seat 61; a rotating shaft 62 is provided between the two bearings 67; and spacers 65 are respectively provided at the upper and lower ends of each mounting seat 61.

[0040] The lever 66 includes a short rod 661 and a long rod 662; one end of the short rod 661 is disposed on the rotating shaft 62, and the other end is disposed on the fixed shaft 63; one end of the long rod 662 is provided with a circular hole 6622 of the same diameter as the fixed shaft 63, and the fixed shaft 63 is located inside the circular hole 6622; the inner wall of the circular hole 6622 is provided with a narrow groove 6621 along the length direction of the long rod 662, and the width of the narrow groove 6621 is smaller than the diameter of the circular hole 6622; two flat pillars 6611 are provided on the outer periphery of the fixed shaft 63, one near the upper end and the other near the lower end, and the flat pillars 6611 can be selectively inserted into the narrow groove 6621; a mounting shaft 64 is provided between the two long rods 662, and the mounting shaft 64 is located at the end away from the short rod 661.

[0041] The U-shaped tie rod 68 is formed by bending both ends of a straight rod at ninety degrees; both ends of the fixed shaft 63 are provided with through holes; both ends of the straight rod are located in the corresponding through holes; both ends of the straight rod are provided with threads; both ends of the straight rod are threadedly connected with adjusting screws; in other embodiments, the two ends of the straight rod may be bent and abut against the two ends of the fixed shaft 63.

[0042] During use, after fastening the furnace door to the furnace body, hook one end of the U-shaped pull rod 68 onto the hook. Adjust the position of the long rod 662 so that the flat column 6611 enters the narrow groove 6621. Then, rotate the long rod 662 towards the furnace door to its limit position, causing the fixed shaft 63 to tighten the hook, thus sealing the furnace door and furnace body. Finally, adjust the position of the long rod 662 so that the flat column 6611 enters the round hole 6622. Rotate the long rod 662 towards the furnace door until it fits against the outer side of the furnace door. The outwardly extending long rod 662 is then retracted to prevent accidental contact.

[0043] The above description is only a specific embodiment of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A door assembly for a box furnace, characterized by: The application relates to a furnace door, which comprises even numbers of quick clamping assemblies symmetrically arranged between a furnace door and a furnace body; the quick clamping assembly comprises a hook arranged on the furnace body, at least one lever arranged on the furnace door, a fixed shaft arranged in the middle of the lever and a U-shaped pull rod arranged on one end of the fixed shaft; the other end of the U-shaped pull rod is selectively hung on the hook; wherein the lever comprises a short lever and a long lever; one end of the short lever is rotationally connected with the furnace door, and the other end of the short lever is arranged with the fixed shaft; one end of the long lever is arranged with a round hole, and the fixed shaft is located in the round hole; the inner wall of the round hole is arranged with a narrow slot, and the width of the narrow slot is smaller than the diameter of the round hole; the outer periphery of the fixed shaft is arranged with a flat column, and the flat column is selectively inserted into the narrow slot.

2. The fire door assembly of claim 1, wherein: The furnace door comprises a furnace door plate, a furnace door cover welding part arranged on one side of the furnace door plate, a lining plate welding part arranged on the other side of the furnace door plate and a foamed ceramic plate arranged in the lining plate welding part; the lining plate welding part is arranged with a frame-shaped fixing strip for fixing the foamed ceramic plate; the side of the fixing strip, which faces the foamed ceramic plate, is uniformly arranged with a plurality of expansion joints.

3. The fire door assembly of any one of claims 1-2, wherein: The lever comprises two short levers and two long levers; the short levers are respectively arranged on the two ends of the fixed shaft; an installation shaft is arranged between the two long levers, and the installation shaft is located at the end far away from the short lever.

4. The fire door assembly of any one of claims 1-2, wherein: The U-shaped pull rod is formed by bending the two ends of a straight rod by 90 degrees; the two ends of the fixed shaft are respectively arranged with through holes; the two ends of the straight rod are respectively located in the corresponding through holes.

5. The fire door assembly of claim 4, wherein: The two ends of the straight rod are respectively arranged with threads; the two ends of the straight rod are respectively threadedly connected with adjusting screws.

6. The fire door assembly of claim 4, wherein: The two ends of the straight rod are abutted with the two ends of the fixed shaft after being bent.

7. The fire door assembly of claim 2, wherein: The side of the lining plate welding part, which is far away from the furnace door plate, is uniformly arranged with a plurality of screw rods; the foamed ceramic plate is arranged on the screw rods; ceramic nuts are threadedly connected on the screw rods; the foamed ceramic plate is arranged with a counterbore for accommodating the ceramic nuts.

8. The fire door assembly of claim 2, wherein: A stone wool pad is arranged between the furnace door plate and the lining plate welding part.

9. The fire door assembly of claim 2, wherein: The side of the furnace door plate, which faces the foamed ceramic plate, is arranged with a groove near the outer periphery; a stone wool packing ring is arranged in the groove; the fixing strip is located on the inner side of the stone wool packing ring.

10. The fire door assembly of any one of claims 1-2, wherein: Fixing blocks are respectively arranged in the middle of the upper and lower ends of the furnace door; a support arm is arranged between the fixing blocks and the furnace body; corner seat welding parts are respectively and symmetrically arranged on the left and right sides of the furnace door, and the quick clamping assemblies are arranged on the corner seat welding parts.

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