Heat treatment furnace door with double-door structure

Abstract

The utility model discloses a heat treatment furnace door with a double-door structure, which comprises a furnace body and a support frame, the support frame is fixed on one side of the furnace body and is opposite to a furnace mouth of the furnace body, an outer door frame is arranged on the support frame, a winch is fixed above the outer door frame, a limiting chute is arranged on the outer door frame, an outer door is arranged in the limiting chute, and the outer door is arranged on the outer door frame. The outer door is connected with a sling of the winch, an inner door is hinged to the inner side of the outer door and is parallel to the outer door, the lower edge and the upper edge of the inner door are lower than the upper edge and the lower edge of the outer door, a cushion block is arranged under the inner door, the winch outputs to drive the outer door and the inner door to ascend and descend, and when the inner door makes contact with the cushion block, the inner door stops descending, and the outer door continues to descend by means of the gravity of the inner door. The double-door structure is adopted, the inner door is used for sealing the furnace mouth, the outer door is hinged to the inner door, the outer door compresses the inner door by means of the gravity of the outer door, the furnace mouth is horizontally sealed by the inner door, the sealing face does not have relative friction motion, and therefore the sealing effect of the inner door is better.

Description

Technical Field

[0001] The utility model relates to the field of chemical waste gas treatment equipment, in particular to a heat treatment furnace door with a double-door structure. Background Art

[0002] Heat treatment furnace refers to a special equipment used for heat treatment of furnace materials. Commonly used heat treatment furnaces include box furnaces, pit furnaces and gas carburizing furnaces. In the normal working process, the workpiece is loaded into the furnace from the furnace door, and the treated workpiece is unloaded from the furnace door. The commonly used method of conveying in the furnace is to load the workpiece on the heat-resistant steel rail and transfer it with a step-by-step moving beam, a push rod or a push-pull hook chain.

[0003] Heat treatment furnaces need to maintain a high temperature and a safe atmosphere inside the furnace, so they have high requirements for sealing. The existing furnace door opening and closing structure is relatively simple, with only the furnace door panel and the heat treatment furnace door frame panel fitting together. The furnace door has no clamping function and even needs to be opened and closed manually, which cannot achieve a more rigorous sealing effect. In addition, most heat treatment furnaces are continuous furnaces, and the furnace door needs to be opened and closed frequently during feeding and unloading. The sealing strip wears quickly, affecting the sealing and heat insulation effects.

[0004] In view of the above-mentioned problems existing in this type of equipment, it is necessary to improve the furnace door sealing structure of this type of equipment. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art, the utility model provides a heat treatment furnace door with a double-door structure, which is divided into an inner door and an outer door. The inner door relies on the outer door's own gravity to press and seal the furnace door. The structural design is reasonable and reliable to solve the above problems.

[0006] The utility model is realized through the following technical solutions:

[0007] A furnace door of a heat treatment furnace with a double-door structure comprises a furnace body and a support frame, the support frame being fixed on one side of the furnace body and facing the furnace mouth of the furnace body, characterized in that: an outer door frame is provided on the support frame, a winch is fixed above the outer door frame, a limiting slide groove is provided on the outer door frame, an outer door is provided in the limiting slide groove, the outer door is connected to the sling of the winch, an inner door is hinged on the inner side of the outer door, the inner door and the outer door are parallel to each other, the lower edge and upper edge of the inner door are lower than the upper edge and lower edge of the outer door, a pad is provided directly below the inner door, the output of the winch drives the outer door and the inner door to rise and fall, when the inner door contacts the pad, the inner door stops descending, and the outer door continues to descend by its own gravity, driving the inner door to translate inward and press the furnace mouth tightly.

[0008] Further optimized, a roller frame is fixed to the bottom of the inner door, and rollers are provided on the roller frame.

[0009] Further optimized, the outer door frame is sleeved on the support frame. A first locking bolt is provided on the side wall of the outer door frame, and first adjusting bolts are further provided on the upper and lower parts on one side of the outer door frame.

[0010] Further optimized, 2-4 second adjusting bolts are provided on the outer door. The second adjusting bolts pass through the outer door and contact the inner door.

[0011] Further optimized, a base is provided at the bottom of the cushion block. A square groove is opened on the base. A pushing block is provided in the square groove. A third adjusting bolt is provided on the outer side wall of the base. The third adjusting bolt passes through the outer side wall of the base, is threadedly connected to the outer side wall of the base, and is rotatably connected to the pushing block. Oblique grooves with the same shape are opened on the side walls of the cushion block and the base. The cushion block is located in the square groove. The second tightening bolt passes through the oblique grooves of the cushion block and the base to limit the cushion block on the base.

[0012] Further optimized, the top of the pushing block and the bottom of the cushion block are mutually matching inclined surfaces.

[0013] Further optimized, grooves are opened on the furnace body around the furnace mouth, and sealing packing is provided in the grooves.

[0014] Further optimized, a heat preservation layer is provided on the inner side of the inner door, and a bead groove corresponding to the sealing packing is fixed on the heat preservation layer.

[0015] The beneficial effects of the present utility model are as follows:

[0016] The present utility model adopts a double-door structure. The inner door is used to seal the furnace mouth. The outer door is hinged to the inner door. The outer door presses the inner door by its own gravity, making the sealing effect of the inner door better. The structure of the present utility model is designed reasonably and reliably, and no additional hydraulic equipment such as an oil cylinder is required.

[0017] This furnace door structure can also be used for pressure relief in emergency situations, and it automatically closes after pressure relief. When a large air pressure is generated instantaneously in the furnace, the inner door moves outward under the push of the air pressure, forcing the outer door to rise automatically to complete the pressure relief action. Subsequently, the outer door falls, the inner door closes, and the normal closed state is restored, and there will be no explosion accident due to excessive air pressure in the furnace.

[0018] When the present utility model is closed, the outer door drives the inner door to fall. After the inner door contacts the bottom cushion block, it becomes a horizontal movement. The outer door continues to fall and pushes the inner door inward horizontally by its gravity to realize the sealing of the inner door and the furnace body. When opening, the outer door rises, no longer presses the inner door, and the inner door first moves horizontally outward along the backing iron and no longer seals the furnace body. The outer door continues to rise, that is, the inner door is lifted through the hinge.

[0019] In this new type, the inner door opens and closes the furnace door by horizontal translation, reducing the wear of the packing and the sealing strip and extending the service life of the furnace door. Brief Description of the Drawings

[0020] Figure 1 It is a three - dimensional structure schematic diagram of the present utility model.

[0021] Figure 2 It is a side view schematic diagram of the present utility model.

[0022] Figure 3 It is a front view schematic diagram of the present utility model.

[0023] Figure 4 It is a three - dimensional structure schematic diagram of the furnace door in the present utility model.

[0024] Figure 5 It is a structure schematic diagram of the furnace opening in the present utility model.

[0025] Figure 6 It is a three - dimensional structure schematic diagram of the cushion block in the present utility model.

[0026] Figure 7 is Figure 6 cross - section schematic diagram.

[0027] In the figure: 1, furnace body; 11, furnace opening; 12, sealing packing; 2, support frame; 3, outer door frame; 31, first adjusting bolt; 32, first locking bolt; 33, limiting sliding groove; 4, outer door; 41, second adjusting bolt; 5, cushion block; 51, base; 52, square groove; 53, third adjusting bolt; 54, inclined groove; 55, second locking bolt; 56, pushing block; 6, inner door; 61, roller; 62, sealing strip; 7, winch; 71, sling. Detailed Description of the Preferred Embodiments

[0028] To clearly illustrate the technical features of this solution, the present utility model will be elaborated in detail below through specific embodiments and in conjunction with its drawings. In the description of the present utility model, it should be noted that the orientation or positional relationships indicated by the terms "left", "right", "front", "rear", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0029] Such as Figures 1 - 7As shown in the figure, the utility model provides a furnace door of a heat treatment furnace with a double-door structure, including a furnace body 1 and a support frame 2. The support frame 2 is fixed on one side of the furnace body, facing the furnace opening 11 of the furnace body. An outer door frame 3 is provided on the support frame 2, and the outer door frame can be finely adjusted left and right on the support frame 2 through a first adjusting bolt 31. A hoist 7 is fixed above the outer door frame 3. A limiting chute 33 is provided on the outer door frame 3, and an outer door 4 is arranged in the limiting chute. The outer door is connected to the sling of the hoist 7, and the output of the hoist drives the outer door to lift and lower in the limiting chute 33.

[0030] An inner door 6 is hinged to the inner side of the outer door 4. The inner door 6 is parallel to the outer door 4. The lower edge and the upper edge of the inner door 6 are lower than the upper edge and the lower edge of the outer door 4. A cushion block 5 is provided directly below the inner door 6. The output of the hoist 7 drives the outer door 4 and the inner door 6 to lift and lower. When the inner door 6 touches the cushion block 5, the inner door 6 stops descending, and the outer door 4 continues to descend by its own gravity, driving the inner door 6 to translate inward and press tightly against the furnace opening 11. When opening the door, the hoist drives the outer door to rise, translating the inner door 6 outward and lifting it.

[0031] As a preferred embodiment, a roller frame is fixed to the bottom of the inner door 6, and rollers 61 are provided on the roller frame. The rollers can make the inner door move more smoothly and steadily when translating inside and outside. It should be noted that the diameter of the rollers 61 should be smaller than the thickness of the inner door so as not to affect the pressing of the inner door.

[0032] As a preferred embodiment, the outer door frame 3 is sleeved on the support frame 2. A first locking bolt 32 is provided on the side wall of the outer door frame. The upper part and the lower part on one side of the outer door frame 3 are also provided with first adjusting bolts 31. During installation, first loosen the first locking bolt 32, then finely adjust the left and right positions of the outer door frame relative to the support frame 2 through the first adjusting bolts 31 on the left and right door frames, and then lock the first locking bolt 32 to facilitate the inner door to face the furnace opening 11.

[0033] As a preferred embodiment, 2 - 4 second adjusting bolts 41 are provided on the outer door 4. The second adjusting bolts 41 pass through the outer door 4 and contact the inner door 6. The second adjusting bolts 41 can adjust the gap between the inner door and the outer door in the open state, as well as the gap between the inner door and the sealing packing.

[0034] As a preferred embodiment, as Figure 6 、 7As shown in the figure, a base 51 is provided at the bottom of the cushion block 5. A square groove 52 is formed in the base. A pushing block 56 is arranged in the square groove. The outer side wall of the base 52 is provided with a third adjusting bolt 53. The third adjusting bolt 53 passes through the outer side wall of the base 52, is threadedly connected to the outer side wall of the base, and is rotationally connected to the pushing block. Oblique grooves 54 with the same shape are formed in the side walls of the cushion block 5 and the base 51. The cushion block 5 is located in the square groove. A second locking bolt 55 passes through the oblique grooves 54 of the cushion block 5 and the base 51 to limit the cushion block 5 on the base. Loosen the second locking bolt 55, adjust the height of the cushion block 5 by adjusting the third adjusting bolt 53, and then tighten the second locking bolt 55. The purpose of adjusting the height of the cushion block is to make the inner door face the furnace opening directly.

[0035] As a preferred embodiment, the top of the pushing block 56 and the bottom of the cushion block 5 are mutually matching inclined surfaces, and the movement of the pushing block can change the height of the cushion block.

[0036] As a preferred embodiment, grooves are formed in the furnace body around the furnace opening 11, and sealing packing 12 is arranged in the grooves.

[0037] As a preferred embodiment, a heat preservation layer is arranged on the inner side of the inner door 6. A bead groove 62 corresponding to the sealing packing 12 is fixed on the heat preservation layer, which is matched with the sealing packing, and the sealing and heat preservation effects are better.

[0038] More specifically:

[0039] During the installation process, the left and right positions of the door frame are finely adjusted through the first adjusting bolt and the first locking bolt on the outer door frame to ensure that the inner door faces the furnace opening in the left and right positions; after the installation is completed, close the furnace door for trial, adjust the height of the cushion block to ensure that the inner door faces the furnace opening in height; during the trial closing process, observe the gaps between the inner door and the outer door, and between the inner door and the sealing packing, and at the same time adjust the second adjusting bolt to ensure that the gaps do not affect the opening and closing of the furnace door.

[0040] When closing the door, the hoist outputs, the outer door drives the inner door to fall. After the inner door contacts the bottom cushion block, it becomes a horizontal movement. The outer door continues to fall and pushes the inner door inward horizontally by its own gravity to realize the sealing between the inner door and the furnace body; when opening, the hoist outputs, the outer door rises, no longer presses the inner door, and the inner door first moves horizontally outward along the cushion iron and no longer seals the furnace body. The outer door continues to rise, that is, the inner door is lifted through the hinge.

[0041] For those parts not detailed in this utility model, they are all well-known technologies to those skilled in the art. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit them. Although this utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of this utility model can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of this utility model, and they should all be covered within the scope of the claims of this utility model.

Claims

1. A furnace door of a heat treatment furnace with a double-door structure, comprising a furnace body and a support frame. The support frame is fixed on one side of the furnace body, facing the furnace opening of the furnace body. It is characterized in that: An outer door frame is provided on the support frame, a hoist is fixed above the outer door frame, a limit chute is opened on the outer door frame, an outer door is arranged in the limit chute, the outer door is connected to the sling of the hoist, an inner door is hinged to the inner side of the outer door, the inner door and the outer door are parallel to each other, the lower edge and the upper edge of the inner door are lower than the upper edge and the lower edge of the outer door, a cushion block is arranged directly below the inner door, the output of the hoist drives the outer door and the inner door to lift and lower, when the inner door touches the cushion block, the inner door stops descending, and the outer door continues to descend by its own gravity, driving the inner door to translate inwards to press tightly against the furnace opening.

2. The furnace door of the heat treatment furnace with a double-door structure according to claim 1, characterized in that: A roller frame is fixed to the bottom of the inner door, and rollers are arranged on the roller frame.

3. The furnace door of the heat treatment furnace with a double-door structure according to claim 1, characterized in that: The outer door frame is sleeved on the support frame, a first locking bolt is arranged on the side wall of the outer door frame, and first adjusting bolts are further arranged on the upper part and the lower part of one side of the outer door frame.

4. The furnace door of the heat treatment furnace with a double-door structure according to claim 1, characterized in that: 2-4 second adjusting bolts are arranged on the outer door, and the second adjusting bolts pass through the outer door and are in contact with the inner door.

5. The furnace door of the heat treatment furnace with a double-door structure according to claim 1, characterized in that: A base is arranged at the bottom of the cushion block, a square groove is opened in the base, a pushing block is arranged in the square groove, a third adjusting bolt is arranged on the outer side wall of the base, the third adjusting bolt passes through the outer side wall of the base, is threadedly connected to the outer side wall of the base, and is rotationally connected to the pushing block. Oblique grooves with the same shape are opened on the side walls of the cushion block and the base. The cushion block is located in the square groove, and a second tightening bolt passes through the oblique grooves of the cushion block and the base to limit the cushion block on the base.

6. The furnace door of the heat treatment furnace with a double-door structure according to claim 5, characterized in that: The top of the pushing block and the bottom of the cushion block are mutually matching inclined surfaces.

7. The furnace door of the heat treatment furnace with a double-door structure according to claim 1, characterized in that: Grooves are opened on the furnace body around the furnace opening, and sealing packing is arranged in the grooves.

8. The furnace door of the heat treatment furnace with a double-door structure according to claim 7, characterized in that: A heat preservation layer is arranged on the inner side of the inner door, and a strip groove corresponding to the sealing packing is fixed on the heat preservation layer.

Images