Large horizontal heat treatment furnace door device

Abstract

The present application discloses a large-scale horizontal heat treatment furnace door device, which includes: a furnace body, which is provided with an opening; a furnace door, which is used to open and close the opening; two baffles, which are located on both sides of the furnace door, and a lower baffle is provided below the baffle, and the lower baffle is located on the descending path of the furnace door; an opening and closing mechanism: which is provided, which is located on both sides of the furnace door, and includes a plurality of synchronously rotating parts, the rotating parts are connected to one side of the furnace door through a rotating shaft, the rotating parts are connected to a first roller, the rotating parts are provided with a lifting end, the first roller and the lifting end are located on both sides of the rotating shaft, and the first roller rolls on the baffle; a lifting wire rope pulls the counterweight connecting rod, so that the furnace door first moves horizontally to open the opening, and then lifts vertically after the furnace door is at a set distance from the opening. This prevents the upper edge of the inner side of the furnace door from scratching the furnace body and preventing the furnace door from being worn.

Description

Technical Field

[0001] The present invention generally relates to the field of machinery, specifically to the field of heat treatment equipment, and in particular to a furnace door device of a large horizontal heat treatment furnace. Background Art

[0002] During the manufacturing process of mechanical components, various heat treatments are performed on the workpieces to achieve various goals, such as increasing component strength and wear resistance. Heat treatment furnaces used for heat treatment of workpieces are required to maintain a predetermined atmosphere within the furnace. During heat treatment, the workpieces are placed into the furnace through an opening in the furnace body. After heat treatment is complete, the workpieces are removed from the furnace body.

[0003] The furnace door of existing large horizontal heat treatment furnaces uses a gate-style door that opens gradually by sliding along a groove. The door is hoisted directly by a steel wire rope. A groove is provided on the furnace body, and rollers are mounted on the furnace door, which roll within the groove. During the heat treatment process, the furnace door must be tightly closed against the furnace body. To prevent scraping between the door and the furnace body during lifting and lowering, a curved section is provided at the bottom of the track. As the door is raised, the rollers roll over the curved section, gradually separating the door from the furnace body. However, to ensure smooth rolling of the rollers on the track, the curved section is relatively large and angled. This results in scraping the inside of the door against the furnace body during initial opening and lowering. Furnace doors are typically made of asbestos, which causes scratching and wear on the door. This results in a loose seal, heat loss, and the need for frequent repairs, increasing the operating and maintenance costs of large horizontal heat treatment furnaces. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a large-scale horizontal heat treatment furnace door device that prevents furnace door wear.

[0005] In a first aspect, a large-scale horizontal heat treatment furnace door device of the present invention comprises:

[0006] a furnace body provided with an opening;

[0007] A furnace door, which is used to open and close the opening, wherein the furnace door is fixedly connected to an upper baffle, and the upper baffle is provided with a waist hole;

[0008] Two baffle rails are provided, the two baffle rails are located on both sides of the furnace door, and a lower baffle plate is provided at the lower part of the baffle rail, and the lower baffle plate is located on the descending path of the furnace door;

[0009] Opening and closing mechanism: It is provided with two, and the two opening and closing mechanisms are located on both sides of the furnace door. The opening and closing mechanism includes a plurality of synchronously rotating rotating parts, and the rotating parts are rotatably connected to one side of the furnace door through a rotating shaft. The rotating parts are rotatably connected to a first roller, and the rotating parts are provided with a pulling end. The plurality of pulling ends are rotatably connected to a counterweight connecting rod respectively. The first roller and the counterweight connecting rod are located on both sides of the rotating shaft. The first roller rolls on the baffle rail, and the counterweight connecting rod passes through the waist hole. A stopper is adjustable on the side of the counterweight connecting rod close to the upper baffle, and the stopper is located between the upper baffle and the lower baffle. The outer diameter of the stopper is larger than the width of the waist hole; and

[0010] A lifting wire rope is used to lift the counterweight connecting rod.

[0011] The lifting wire rope pulls the counterweight connecting rod so that the furnace door is first translated in the horizontal direction to open the opening, and then lifted in the vertical direction after the furnace door is at a set distance from the opening.

[0012] According to the technical solution provided in the embodiment of the present application, an opening and closing mechanism is set up, when the furnace door is opened, the pulling wire rope pulls the counterweight connecting rod, driving the rotating part to rotate, so that the first rollers on the multiple rotating parts on both sides are synchronously moved closer to the stop rails on both sides, and then the furnace door is pried open in accordance with the stop rails, that is, the furnace door is first driven to move horizontally, so that the furnace door is away from the furnace body, the opening is opened, and the pulling wire rope continues to pull. When the block touches the upper baffle, the furnace door has left the opening to the set distance. The pulling wire rope will lift the furnace door in the vertical direction to avoid scratching and wear between the inner side of the furnace door and the furnace body, which causes the furnace door to be not closed tightly, resulting in heat loss and frequent maintenance, so as to achieve the effect of reducing the operation and maintenance costs of large horizontal heat treatment furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0014] Figure 1 This is a front view of the structure of a large horizontal heat treatment furnace door device according to an embodiment of the present invention;

[0015] Figure 2 A schematic side view of the structure of a large horizontal heat treatment furnace door device according to an embodiment of the present invention;

[0016] Figure 3 This is a structural schematic diagram of the cooperation between the counterweight connecting rod and the stopper of the furnace door device of a large horizontal heat treatment furnace according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0018] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] Please refer to Figures 1 to 3 , the furnace door device of a large horizontal heat treatment furnace of the present invention comprises: a furnace body, which is provided with an opening; a furnace door 100, which is used to open and close the opening, the furnace door 100 is fixedly connected to an upper baffle 130, and the upper baffle 130 is provided with a waist hole 131; a baffle rail 200, which is provided with two, the two baffle rails 200 are located on both sides of the furnace door 100, and a lower baffle 210 is provided at the lower part of the baffle rail 200, and the lower baffle 210 is located on the descending path of the furnace door 100; an opening and closing mechanism 300: it is provided with two, the two opening and closing mechanisms 300 are located on both sides of the furnace door 100, the opening and closing mechanism 300 includes a plurality of synchronously rotating rotating parts 310, the rotating part 310 is rotatably connected to one side of the furnace door 100 through a rotating shaft 320, the rotating part 310 is rotatably connected to a first roller 311, the rotating part 310 is provided with a pulling end 313, and the plurality of pulling ends 313 are respectively connected to the counterweight The rod 330 is rotatably connected, the first roller 311 and the counterweight connecting rod 330 are located on both sides of the rotating shaft 320, the first roller 311 rolls on the baffle rail 200, the counterweight connecting rod 330 passes through the waist hole 131, and the side of the counterweight connecting rod 330 close to the upper baffle 130 is adjustable and connected to a stopper 334, which is located between the upper baffle 130 and the lower baffle 210, and the outer diameter of the stopper 334 is greater than the width of the waist hole 131; The lifting wire rope 400 is used to lift the counterweight connecting rod 330. The lifting wire rope 400 pulls the counterweight connecting rod 330, driving multiple rotating parts 310 to rotate synchronously so that the upper and lower first rollers 311 move synchronously toward the retaining rail 200, and then fit the retaining rail 200 (synchronously on both sides) to pry open the furnace door 100, so that the furnace door 100 first moves horizontally to open the opening, and then the furnace door 100 is lifted vertically after it is a set distance away from the opening.

[0020] In an embodiment of the present invention, the furnace body is provided with an opening, through which workpieces are loaded and unloaded, and the furnace door is capable of opening and closing the opening. Specifically, when a workpiece needs to be placed in or removed from the furnace body, an electric hoist pulls a steel wire rope, which in turn pulls the furnace door, causing the furnace door to rise and open the opening, allowing the workpiece to smoothly enter and exit the furnace through the opening. When a workpiece is placed in the furnace body and heat treated, the electric hoist releases the steel wire rope, causing the furnace door to descend under its own gravity until the furnace door closes the opening.

[0021] Two retaining rails are provided, one on each side of the furnace door. Two door opening mechanisms are also provided, one on each side of the furnace door. On one side of the furnace door, one opening mechanism works with one retaining rail; on the other side, another opening mechanism works with another retaining rail. By providing retaining rails and door opening mechanisms on both sides of the furnace door, the forces acting on the furnace door are balanced during opening and closing.

[0022] The baffle rail is provided with a lower baffle plate, which is located on the descending path of the furnace door. The door opening mechanism includes multiple synchronously rotating parts, each of which is rotatably connected to one side of the furnace door. Multiple rotating parts of the same door opening mechanism are located on one side of the furnace door. The rotating parts are rotatably connected to a first roller, which is provided with a lifting end. The first roller rolls on the baffle rail. The baffle rail is provided with a first side 231 and a second side 232, which are opposite to each other. The second side 232 is the side of the baffle rail close to the furnace body, and the first side 231 is the side of the baffle rail away from the furnace body. The first roller 311 rolls on the first side 231.

[0023] refer to Figure 2 When the opening of the furnace body needs to be opened, the lifting wire rope pulls the counterweight connecting rod, and the counterweight connecting rod drives multiple rotating parts to rotate synchronously in the clockwise direction in the figure, and the first roller is against the first side. As the rotating part rotates, the rotating part moves the furnace door to the right in the figure through the rotating shaft, and the rotating part begins to tilt, causing the furnace door to first move horizontally away from the furnace body. As the lifting wire rope continues to pull, when the block touches the upper baffle, when the furnace door is at a set distance from the opening, the block will drive the upper baffle to move upward, that is, the wire rope pulls the furnace door upward in the vertical direction to prevent the furnace door from scratching against the furnace body during the upward movement, thereby avoiding scratching and wear of the furnace door, and reducing the operation and maintenance costs of large horizontal heat treatment furnaces. In the process of opening the opening, the furnace door first moves outward to separate from the furnace body and open the opening, and then rises in the vertical direction.

[0024] A stopper is adjustably connected to the counterweight connecting rod. Adjusting the stopper's position on the counterweight connecting rod adjusts the set distance. Specifically, when the furnace door is closed, the farther the stopper is from the upper baffle, the greater the set distance between the furnace door and the opening; the closer the stopper is to the upper baffle, the smaller the set distance between the furnace door and the opening. The position of the stopper on the counterweight connecting rod, specifically the distance between the stopper and the upper baffle, can be adjusted based on actual conditions to prevent scraping of the furnace door against the furnace body when opening and closing.

[0025] When the furnace door opening needs to be closed, the lifting wire rope begins to relax, and the furnace door descends under its own weight. During the furnace door's descent, the rotating member always remains tilted, so that the upper and lower first rollers on both sides fit against the rails on both sides, forming an inclined angle (the angle can be fine-tuned) to ensure that the rollers fit tightly against the rails, allowing it to slide and descend smoothly on the rails. This also keeps the furnace door at a certain distance from the furnace body to prevent scratches. After the furnace door moves to be stopped by the lower baffle, it cannot continue to descend due to the lower baffle's stop. As the lifting wire rope continues to relax, the rotating member rotates counterclockwise due to the gravity of the counterweight connecting rod, and the first roller will disengage from the first side. The cylinder can then push the furnace door toward the furnace body, closing the opening. In the process of closing the opening, the furnace door first descends vertically from a position away from the furnace body, and then moves inward to close the opening.

[0026] A limit plate 312 may be provided on the side of the first roller 311 near the furnace door, and the limit plate 312 surrounds the first roller. When the first roller rolls on the first side, the limit plate 312 prevents the first roller from leaving the first side, thereby ensuring the reliability of the first roller rolling on the rail.

[0027] It is possible but not limited to that a single door opening mechanism is provided with two rotating parts, one rotating part is located above the furnace door, and the other rotating part is located below the furnace door, to ensure that the furnace door can be subjected to balanced force when the rotating part rotates.

[0028] Furthermore, the upper baffle 110 is rotatably connected to the second roller 111 , the first roller 311 and the second roller 111 are located on opposite sides of the baffle rail 200 , and the horizontal distance between the first roller 311 and the second roller 111 is greater than the width of the baffle rail 200 .

[0029] In an embodiment of the present invention, the vertical height of the second roller is greater than the vertical height of the first roller. In the process of pulling the counterweight connecting rod by the lifting wire rope to drive the furnace door to move, the first roller rolls on the first side and the second roller rolls on the second side, thereby maintaining the balance of the furnace door, preventing the furnace door from moving away from the rail, and ensuring the stability of the furnace door movement.

[0030] Furthermore, a fixing seat 120 is fixedly connected to the bottom of the furnace door 100 , and a plurality of third rollers 121 are rotatably connected to the side of the fixing seat 120 facing the lower baffle 210 , and the lower baffle 210 is located directly below the third rollers 121 .

[0031] In an embodiment of the present invention, the lower baffle can stop and support the furnace door, limiting the lowest position of the furnace door. When the lower baffle stops the furnace door, the third roller closely abuts the lower baffle. When the furnace door moves outward or inward, the third roller rolls on the lower baffle, preventing the furnace door from scratching the lower baffle and facilitating translation of the furnace door.

[0032] Furthermore, the rail 200 is fixedly connected to a plurality of cylinders 220 , which move synchronously and are used to drive the furnace door 100 to fit closely against the furnace body.

[0033] In an embodiment of the present invention, when the furnace door lowers to close the opening, after the door moves to a stop against the lower baffle, multiple cylinders synchronize to push the door against the furnace body, sealing the opening. Furthermore, during heat treatment of workpieces in the heat treatment furnace, the cylinders press against the door, ensuring a tight seal between the door and the furnace body. When the door needs to be raised to open the opening, the cylinders reset, preventing them from interfering with the door's translational movement.

[0034] Furthermore, the furnace door 100 is fixedly connected with a push plate, which faces the cylinder 220 .

[0035] In the embodiment of the present invention, the cylinder drives the furnace door to be close to the furnace body by pushing the pushing plate. By providing the pushing plate, it is convenient for the cylinder to push the furnace door to move.

[0036] Furthermore, the furnace door 100 is fixedly connected to a trigger block, and the retaining rail 200 is provided with a travel switch. When the furnace door 100 drops to the lowest position, the trigger block triggers the travel switch, and the cylinder 220 pushes the furnace door 100 close to the furnace body.

[0037] In an embodiment of the present invention, when the furnace door descends to its lowest position, the trigger block activates the limit switch and stops the electric hoist. The pneumatic cylinder, upon receiving the trigger signal from the limit switch, signals that the furnace door has reached its lowest position. The electric hoist stops and no longer drives the lifting wire rope. The piston rod of the pneumatic cylinder extends, pushing the furnace door against the furnace body, thus achieving automated control.

[0038] Furthermore, the counterweight connecting rod 330 is fixedly connected to a connecting rod 331 at one end close to the upper baffle 130, and the connecting rod 331 is threaded with an adjusting nut 332. The side of the adjusting nut 332 facing the upper baffle 130 is fixedly connected to a stop block 334. The end of the connecting rod 331 passing through the waist hole 131 is fixedly connected to a connecting stop seat 333, and the lifting wire rope 400 lifts the connecting stop seat 333.

[0039] In an embodiment of the present invention, when the position of the stopper needs to be adjusted, the adjusting nut can be rotated to change the threaded connection position between the adjusting nut and the connecting rod. A locking nut can be threaded onto the connecting rod, located on the side of the adjusting nut facing away from the stopper, to lock the adjusting nut. The connecting rod is also provided with a connection stop seat, which prevents the connecting rod from passing through the waist hole.

[0040] Furthermore, the lifting end 313 of the rotating member 310 at the bottom is rotatably connected to the connecting member 314 , and the bolt 315 passes through the connecting member 314 and is threadedly connected to the counterweight connecting rod 330 .

[0041] In this embodiment of the present invention, the connecting member is rotatably connected to the lifting end. The connecting member 314 may include, but is not limited to, a first connecting plate 318 and a second connecting plate 319. The lifting end 313 is partially located between the first connecting plate 318 and the second connecting plate 319, thereby ensuring a secure connection between the connecting member and the lifting end. Bolts pass through the connecting member and are threadedly connected to the counterweight connecting rod. By rotating the bolts, the distance between the connecting member and the counterweight connecting rod can be adjusted, facilitating installation and commissioning of the furnace door assembly of a large horizontal heat treatment furnace.

[0042] Furthermore, the bolt 315 is threaded with a first nut 316 and a second nut 317 , and the first nut 316 and the second nut 317 are both located between the counterweight connecting rod 330 and the connecting member 314 .

[0043] In an embodiment of the present invention, by rotating the first nut and the second nut, when the furnace door is driven to move by pulling the steel wire rope, the first roller located above and the first roller located below are synchronously attached to the first side, thereby ensuring the stability of the furnace door movement.

[0044] Furthermore, one end of the rotating member 310 connected to the first roller 311 is bent downward.

[0045] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. A large horizontal heat treatment furnace door device, characterized in that: The door device of the large horizontal heat treatment furnace includes: a furnace body provided with an opening; A furnace door, which is used to open and close the opening, wherein the furnace door is fixedly connected to an upper baffle, and the upper baffle is provided with a waist hole; Two baffle rails are provided, the two baffle rails are located on both sides of the furnace door, and a lower baffle plate is provided at the lower part of the baffle rail, and the lower baffle plate is located on the descending path of the furnace door; Opening and closing mechanism: It is provided with two, and the two opening and closing mechanisms are located on both sides of the furnace door. The opening and closing mechanism includes a plurality of synchronously rotating rotating parts, and the rotating parts are rotatably connected to one side of the furnace door through a rotating shaft. The rotating parts are rotatably connected to a first roller, and the rotating parts are provided with a pulling end. The plurality of pulling ends are rotatably connected to a counterweight connecting rod respectively. The first roller and the counterweight connecting rod are located on both sides of the rotating shaft. The first roller rolls on the baffle rail, and the counterweight connecting rod passes through the waist hole. A stopper is adjustable on the side of the counterweight connecting rod close to the upper baffle, and the stopper is located between the upper baffle and the lower baffle. The outer diameter of the stopper is larger than the width of the waist hole; and A lifting wire rope is used to lift the counterweight connecting rod. The lifting wire rope pulls the counterweight connecting rod, so that the furnace door first moves horizontally to open the opening, and then lifts the furnace door vertically after the distance from the opening reaches a set distance. The upper baffle is rotatably connected to a second roller, the first roller and the second roller are located on opposite sides of the baffle rail, and the horizontal distance between the first roller and the second roller is greater than the width of the baffle rail. The bottom of the furnace door is fixedly connected with a fixing seat, and a side of the fixing seat facing the lower baffle is rotatably connected with a plurality of third rollers, and the lower baffle is located directly below the third rollers.

2. The large horizontal heat treatment furnace door device according to claim 1, characterized in that: The retaining rail is fixedly connected to a plurality of cylinders, which act synchronously and are used to drive the furnace door to fit closely against the furnace body.

3. The large horizontal heat treatment furnace door device according to claim 2, characterized in that: The furnace door is fixedly connected with a push plate, and the push plate faces the cylinder.

4. The large horizontal heat treatment furnace door device according to claim 2, characterized in that: The furnace door is fixedly connected with a trigger block, and the retaining rail is provided with a travel switch. When the furnace door descends to the lowest position, the trigger block triggers the travel switch, and the cylinder pushes the furnace door to fit tightly against the furnace body.

5. The large horizontal heat treatment furnace door device according to claim 1, characterized in that: The counterweight connecting rod is fixedly connected to a connecting rod at one end close to the upper baffle, and an adjusting nut is threaded on the connecting rod. The adjusting nut is fixedly connected to the stop block on the side facing the upper baffle, and the connecting rod is fixedly connected to a connecting stop seat at one end passing through the waist hole, and the lifting wire rope lifts the connecting stop seat.

6. The large horizontal heat treatment furnace door device according to claim 1, characterized in that: The lifting end of the rotating member located at the bottom is rotatably connected to a connecting member, and a bolt passes through the connecting member and is threadedly connected to the counterweight connecting rod.

7. The large horizontal heat treatment furnace door device according to claim 6, characterized in that: The bolt is threaded with a first nut and a second nut, and the first nut and the second nut are both located between the counterweight connecting rod and the connecting member.

8. The large horizontal heat treatment furnace door device according to claim 1, characterized in that: One end of the rotating member connected to the first roller is bent downward.

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