A sintering furnace thermal insulation door opening and closing structure

Abstract

The present invention discloses an opening and closing structure of an insulation door in a sintering furnace, including a sealing box door driving structure and an insulation door follower structure. When the one-way acting cylinder pulls the push rod, in the first stage, the sealing box door gradually opens while the insulation door remains stationary, and the gap between the door hanging plate bracket and the limiting card plate gradually narrows; in the second stage, the door hanging plate bracket and the limiting card plate are offset, and the one-way acting cylinder continues to pull the push rod, continuing to drive the sealing box door to open, and at the same time drives the insulation door to open to overcome the pressure of the first spring structure and the second spring structure. When the one-way acting cylinder applies a thrust to the push rod under the action of the built-in spring, the sealing box door gradually closes, and the insulation door 8 also gradually closes under the pressure of the first spring structure and the second spring structure. Compared with the prior art, the opening and closing structure of the insulation door in the sintering furnace of the present invention can open and close the insulation door, independently open and close the sealing door, and eliminate the influence of different thermal expansions of the insulation door and the sealing box door.

Description

Technical Field

[0001] The invention relates to the technical field of sintering furnaces, in particular to an opening and closing structure of a heat-insulating door in a sintering furnace. Background Art

[0002] Sintering furnace refers to a special equipment that makes powder compacts obtain the required physical, mechanical properties and microstructure through sintering, and is widely used in industrial production. With the increasing production requirements, the industry's requirements for the opening and closing structure of the insulation door in the sintering furnace are also getting higher and higher.

[0003] In order to enable rapid cooling in the furnace, shorten the production cycle, and improve production efficiency, the insulation door must be able to change its open and closed state in the corresponding process section when the furnace is in operation; because the thermal expansion coefficients of the insulation material and the graphite material (the material of the sealing box) are different, during high-temperature sintering, there needs to be space for relative movement between the insulation door and the sealing box door, and even for different processes, the sealing box door can be opened and closed independently; at the same time, the door opening and closing structure should also be easy to install, run smoothly without jamming, and especially the door must be closed in place. Most of the sintering furnaces in the industry can only meet one or two of the above three requirements, and some furnaces even have the sealing box door and the insulation door closed during production and cannot be opened. Summary of the invention

[0004] The purpose of the present invention is to provide an opening and closing structure of an insulation door in a sintering furnace which can open and close the insulation door, independently open and close the sealing door, and eliminate the influence of different thermal expansions of the insulation door and the sealing box door during production.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The invention discloses an opening and closing structure of a heat preservation door in a sintering furnace, comprising:

[0007] A sealed box door driving structure, the sealed box door driving structure comprises a door hanging plate, a door hanging plate bracket, a push rod, a self-centering connector and a single-acting cylinder, one end of the door hanging plate is fixed to the sealed box door, the other end of the door hanging plate passes through the insulation door and is fixed to the door hanging plate bracket, the door hanging plate bracket is fixed to the push rod, the push rod is connected to the single-acting cylinder through the self-centering connector, the single-acting cylinder is fixed to the furnace door and drives the push rod to move forward and backward;

[0008] The thermal insulation door follower structure includes a push ring, a roller, a roller bracket, a first spring structure and a second spring structure. The push ring is located on the outside of the thermal insulation door and is fixedly connected to the thermal insulation door. The two rollers are rotatably connected to the left and right ends of the push ring respectively. The axis of the roller is horizontal and perpendicular to the axis of the thermal insulation door. The roller bracket is fixed on the end face of the furnace door facing the push ring. The roller can roll forward and backward along the roller bracket. The first spring structure and the second spring structure are both fixed on the end face of the furnace door facing the push ring. On the end face of the push ring, the first spring structure can pull and push the push ring, and the second spring structure can only push the push ring. The push ring has a limit card plate, and the limit card plate is located between the door hanging plate bracket and the furnace door. When the sealed box door and the insulation door are closed, a gap is left between the door hanging plate bracket and the limit card plate. When the push rod pulls the door hanging plate bracket to move toward the furnace door, the limit card plate can resist the door hanging plate bracket and follow the movement toward the furnace door under the drive of the door hanging plate bracket.

[0009] Preferably, the number of the first spring structures is two, which are respectively distributed at the upper end and the lower end of the push ring, and the number of the second spring structures is two, which are respectively distributed at the left end and the right end of the push ring.

[0010] Preferably, the first spring structure and the second spring structure both include a spring, a screw, a guide gasket, a first shaft rod and a spring seat, a concave hole is provided on the side of the furnace door opposite to the push ring, and the concave hole is provided with the spring, the screw, the guide gasket and the first shaft rod in sequence from the inside to the outside, the guide gasket is slidably arranged in the concave hole, the screw passes through the guide gasket and is threadedly connected to one end of the first shaft rod, so that the guide gasket is clamped between the screw and the first shaft rod, the other end of the first shaft rod of the first spring structure passes through the push ring, and axial limiting structures are provided on the first shaft rod on both sides of the push ring, and the other end of the first shaft rod of the second spring structure is detachably abutted against the push ring.

[0011] Preferably, the first spring structure also includes a nut, a large gasket and a limiting ring, the axial limiting structure includes the nut and the large gasket, the other end of the first shaft rod of the first spring structure is threadedly connected with two of the nuts, the push ring is provided with a mounting plate, the two nuts are respectively located on both sides of the mounting plate, the mounting plate is provided with a through groove for the first shaft rod of the first spring structure to pass through, a large gasket is provided between each of the nut and the mounting plate, the limiting ring is located in the through groove, the first shaft rod of the first spring structure passes through the limiting ring, the length of the limiting ring is greater than the thickness of the mounting plate, and a gap is left between the first shaft rod of the first spring structure and the limiting ring.

[0012] Preferably, the second spring structure further comprises a second shaft rod, the second shaft rod is threadedly connected to the other end of the first shaft rod of the second spring structure, the push ring is provided with a push plate, and the second shaft rod is used to abut against the push plate.

[0013] Compared with the prior art, the present invention has achieved the following technical effects:

[0014] 1. The insulation door can be opened and closed to enable the furnace to cool quickly, shorten the production cycle and improve production efficiency;

[0015] 2. The elastic structure eliminates the influence of different thermal expansion between the insulation door and the sealed door, and the sealed door can be opened and closed separately;

[0016] 3. The door opening and closing structure is easy to install and does not get stuck during movement. Because it is spring-loaded, it can ensure that the door is closed in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the main view direction of the opening and closing structure of the heat preservation door in the sintering furnace of this embodiment when the sealing box door and the heat preservation door are both closed;

[0019] Figure 2 It is a schematic diagram of the structure of the thermal insulation door opening and closing structure in the sintering furnace of this embodiment when the sealing box door and the thermal insulation door are both closed, viewed from above;

[0020] Figure 3 This is a structural diagram in which the sealed box door is open but the insulation door is not opened;

[0021] Figure 4 This is a schematic diagram of the structure with both the sealed box door and the thermal insulation door open;

[0022] Figure 5 It is a schematic diagram of the structure of the push ring;

[0023] Figure 6 is a schematic diagram of a first spring structure;

[0024] Figure 7 is a schematic diagram of a second spring structure;

[0025] Figure 8 It is a schematic diagram of the position relationship between the push ring and the adjacent structure;

[0026] Explanation of the reference numerals: 1-furnace body; 2-insulation cylinder; 3-push ring; 4-roller; 5-roller bracket; 6-door hanging plate bracket; 7-sealed box body; 8-insulation door; 9-sealed box door; 10-door hanging plate; 11-furnace door; 12-self-centering connector; 13-single-acting cylinder; 14-push rod; 15-first spring structure; 16-second spring structure; 17-spring; 18-screw; 19-guide gasket; 20-first shaft rod; 21-spring seat; 22-nut; 23-large gasket; 24-limiting ring; 25-second shaft rod. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide an opening and closing structure of an insulation door in a sintering furnace which can open and close the insulation door, independently open and close the sealing door, and eliminate the influence of different thermal expansions of the insulation door and the sealing box door during production.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1-8 As shown, this embodiment provides an opening and closing structure of a heat preservation door in a sintering furnace, including a sealing door driving structure and a heat preservation door following structure. The opening and closing structure is installed on a sintering furnace, and a heat preservation cylinder 2 and a sealing box body 7 are provided in the sintering furnace. The heat preservation cylinder 2 and the sealing box body 7 are fixed on the furnace body 1 of the sintering furnace, and the sealing box body 7 is located in the heat preservation cylinder 2. The above content is common knowledge in the art, so it will not be repeated here.

[0031] The sealed box door driving structure includes a door hanging plate 10, a door hanging plate bracket 6, a push rod 14, a self-centering connector 12 and a single-acting cylinder 13. One end of the door hanging plate 10 is fixed to the sealed box door 9, and the other end of the door hanging plate 10 passes through the insulation door 8 and is fixed to the door hanging plate bracket 6. The door hanging plate bracket 6 is fixed to the push rod 14. The push rod 14 is connected to the single-acting cylinder 13 through the self-centering connector 12. The single-acting cylinder 13 is fixed to the furnace door 11 and drives the push rod 14 to move forward and backward. The single-acting cylinder 13 has a built-in spring, which applies a thrust to the push rod 14 when the built-in spring is reset. When the single-acting cylinder 13 applies a pulling force to the push rod 14, the sealed box door 9 can be opened. The self-centering connector 12 allows the push rod 14 to always maintain an unchanged angle during movement, that is, parallel to the axis of the furnace door 11.

[0032] The follow-up structure of the thermal insulation door 8 includes a push ring 3, a roller 4, a roller bracket 5, a first spring structure 15 and a second spring structure 16. The push ring 3 is located on the outside of the thermal insulation door 8 and is fixedly connected to the thermal insulation door 8. In this embodiment, the push ring 3 is evenly distributed with six fixed plates along the circumferential direction, and each fixed plate is fixedly connected to the thermal insulation door 8 by screws or other fasteners. Those skilled in the art can also choose other fixed connection methods. The two rollers 4 are respectively rotatably connected to the left and right ends of the push ring 3. Specifically, a rotating shaft is fixed to the left and right ends of the push ring 3. The rollers 4 are rotatably connected to the rotating shaft through bearings. The axis of the rollers 4 is horizontal and perpendicular to the axis of the thermal insulation door 8. The roller bracket 5 is fixed on the end face of the furnace door 11 facing the push ring 3, and the rollers 4 can roll forward and backward along the roller bracket 5. The first spring structure 15 and the second spring structure 16 are both fixed on the end face of the furnace door 11 facing the push ring 3. The first spring structure 15 can pull and push the push ring 3, and the second spring structure 16 can only push the push ring 3. The first spring structure 15 and the second spring structure 16 can apply a relatively large pressing force to the heat-insulating door 8 to keep the heat-insulating door 8 airtight.

[0033] The push ring 3 has a limit card plate, which is located between the door hanging plate bracket 6 and the furnace door 11. When the sealed box door 9 and the insulation door 8 are closed, a gap is left between the door hanging plate bracket 6 and the limit card plate. When the push rod 14 pulls the door hanging plate bracket 6 to move toward the furnace door 11, the limit card plate can be against the door hanging plate bracket 6, that is, the limit card plate and the door hanging plate bracket 6 have a partial overlap in axial projection, so that the push ring 3 is driven by the door hanging plate bracket 6 to move toward the furnace door 11.

[0034] When the heat preservation door opening and closing structure in the sintering furnace of this embodiment is in use, the process of the one-way acting cylinder pulling the push rod 14 is divided into two stages: in the first stage, the sealed box door 9 is gradually opened while the heat preservation door 8 remains stationary, and the gap between the door hanging plate bracket 6 and the limit card plate is gradually reduced; in the second stage, the door hanging plate bracket 6 and the limit card plate are against each other, and the one-way acting cylinder continues to pull the push rod 14, continues to drive the sealed box door 9 to open, and at the same time drives the heat preservation door 8 to open by overcoming the pressure of the first spring structure 15 and the second spring structure 16. When the one-way acting cylinder applies a thrust to the push rod 14 under the action of the built-in spring, the sealed box door 9 is gradually closed, and the heat preservation door 8 is also gradually closed under the pressure of the first spring structure 15 and the second spring structure 16.

[0035] There are various specific distribution forms and structural forms of the first spring structure 15 and the second spring structure 16, and those skilled in the art can select according to actual needs.

[0036] In this embodiment, there are two first spring structures 15, which are respectively distributed at the upper end and the lower end of the push ring 3 ( Figure 5There are two second spring structures 16, which are respectively distributed at the left and right ends of the push ring 3 ( Figure 5 Middle position B).

[0037] In this embodiment, the first spring structure 15 and the second spring structure 16 both include a spring 17, a screw 18, a guide washer 19, a first shaft 20 and a spring seat 21. A concave hole is provided on one side of the furnace door 11 opposite to the push ring 3, and the concave hole is provided with a spring 17, a screw 18, a guide washer 19 and a first shaft 20 in sequence from the inside to the outside. The guide washer 19 is slidably arranged in the concave hole, and the screw 18 passes through the guide washer 19 and is threadedly connected with one end of the first shaft 20, so that the guide washer 19 is clamped between the screw 18 and the first shaft 20. A central concave hole is provided on the side of the guide washer 19 facing the first shaft 20, and the end of the first shaft 20 is embedded in the central concave hole to ensure the concentricity of the guide washer 19 and the first shaft 20. The other end of the first shaft 20 of the first spring structure 15 passes through the push ring 3, and the first shaft 20 on both sides of the push ring 3 is provided with an axial limit structure, and the other end of the first shaft 20 of the second spring structure 16 is detachably abutted against the push ring 3.

[0038] In this embodiment, the first spring structure 15 also includes a nut 22, a large washer 23 and a limit ring 24, and the axial limit structure includes a nut 22 and a large washer 23. The other end of the first shaft 20 of the first spring structure 15 is threadedly connected to two nuts 22, and the push ring 3 is provided with a mounting plate, and the two nuts 22 are respectively located on both sides of the mounting plate. A through slot is provided on the mounting plate for the first shaft 20 of the first spring structure 15 to pass through, and a large washer 23 is provided between each nut 22 and the mounting plate, and the limit ring 24 is located in the through slot. The first shaft 20 of the first spring structure 15 passes through the limit ring 24, and the length of the limit ring 24 is greater than the thickness of the mounting plate, and a gap is left between the first shaft 20 of the first spring structure 15 and the limit ring 24. Since the through slot is larger than the first shaft 20, except for the force in the front and rear directions, there is no force on the top, bottom, left and right, which greatly reduces the probability of motion jamming and is easier to install.

[0039] In this embodiment, the second spring structure 16 further includes a second shaft 25, which is threadedly connected to the other end of the first shaft 20 of the second spring structure 16, and the push ring 3 has a push plate, and the second shaft 25 is used to abut against the push plate. By rotating the second shaft 25, the length of the overall structure of the first shaft 20 and the second shaft 25 can be adjusted.

[0040] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A sintering furnace heat preservation door opening and closing structure, characterized in that: include: A sealed box door driving structure, the sealed box door driving structure comprises a door hanging plate, a door hanging plate bracket, a push rod, a self-centering connector and a single-acting cylinder, one end of the door hanging plate is fixed to the sealed box door, the other end of the door hanging plate passes through the insulation door and is fixed to the door hanging plate bracket, the door hanging plate bracket is fixed to the push rod, the push rod is connected to the single-acting cylinder through the self-centering connector, the single-acting cylinder is fixed to the furnace door and drives the push rod to move forward and backward; The thermal insulation door follower structure includes a push ring, a roller, a roller bracket, a first spring structure and a second spring structure. The push ring is located on the outside of the thermal insulation door and is fixedly connected to the thermal insulation door. The two rollers are rotatably connected to the left and right ends of the push ring respectively. The axis of the roller is horizontal and perpendicular to the axis of the thermal insulation door. The roller bracket is fixed on the end face of the furnace door facing the push ring. The roller can roll forward and backward along the roller bracket. The first spring structure and the second spring structure are both fixed on the end face of the furnace door facing the push ring. On the end face of the push ring, the first spring structure can pull and push the push ring, and the second spring structure can only push the push ring. The push ring has a limit card plate, and the limit card plate is located between the door hanging plate bracket and the furnace door. When the sealed box door and the insulation door are closed, a gap is left between the door hanging plate bracket and the limit card plate. When the push rod pulls the door hanging plate bracket to move toward the furnace door, the limit card plate can resist the door hanging plate bracket and follow the movement toward the furnace door under the drive of the door hanging plate bracket.

2. The sintering furnace heat preservation door opening and closing structure according to claim 1, characterized in that: There are two first spring structures, which are respectively distributed at the upper end and the lower end of the push ring; there are two second spring structures, which are respectively distributed at the left end and the right end of the push ring.

3. The sintering furnace heat preservation door opening and closing structure according to claim 2, characterized in that: The first spring structure and the second spring structure both include a spring, a screw, a guide gasket, a first shaft rod and a spring seat. A concave hole is provided on the side of the furnace door opposite to the push ring. The concave hole is provided with the spring, the screw, the guide gasket and the first shaft rod in sequence from the inside to the outside. The guide gasket is slidably arranged in the concave hole. The screw passes through the guide gasket and is threadedly connected to one end of the first shaft rod so that the guide gasket is clamped between the screw and the first shaft rod. The other end of the first shaft rod of the first spring structure passes through the push ring. Axial limiting structures are provided on the first shaft rod on both sides of the push ring. The other end of the first shaft rod of the second spring structure is detachably abutted against the push ring.

4. The sintering furnace heat preservation door opening and closing structure according to claim 3, characterized in that: The first spring structure also includes a nut, a large gasket and a limiting ring. The axial limiting structure includes the nut and the large gasket. The other end of the first shaft rod of the first spring structure is threadedly connected to two of the nuts. The push ring is provided with a mounting plate. The two nuts are respectively located on both sides of the mounting plate. The mounting plate is provided with a through groove for the first shaft rod of the first spring structure to pass through. A large gasket is provided between each nut and the mounting plate. The limiting ring is located in the through groove. The first shaft rod of the first spring structure passes through the limiting ring. The length of the limiting ring is greater than the thickness of the mounting plate. A gap is left between the first shaft rod of the first spring structure and the limiting ring.

5. The sintering furnace heat preservation door opening and closing structure according to claim 3, characterized in that: The second spring structure further comprises a second shaft rod, which is threadedly connected to the other end of the first shaft rod of the second spring structure. The push ring is provided with a push plate, and the second shaft rod is used to abut against the push plate.

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