Supporting plate type continuous quenching furnace

Abstract

The utility model provides a supporting plate type continuous quenching furnace which comprises a quenching tank and a conveyor belt arranged in the quenching tank, a stirrer is also arranged in the quenching tank and is positioned at the bottom of the conveyor belt, and a driving mechanism for driving the stirrer to rotate is arranged on the outer side of the quenching tank; the stirrer comprises a stirring shaft detachably connected with the inner wall of the quenching tank, stirring blades are fixedly connected to the outer side wall of the stirring shaft, scrapers are fixedly connected to the side edges of the stirring blades, and the surfaces of the stirring blades are covered with filter screen plates. And the filter screen plate is inclined relative to the stirring blades and is communicated with the interior of the stirring shaft. By arranging the stirrer, the cooling speed of a quenching medium can be increased, the quenching temperature of the quenching medium can be favorably kept, the quenching effect of a workpiece is further improved, and by arranging the scraper, impurity cakes at the bottom of the quenching tank can be effectively removed, and the impurity cakes are prevented from polluting the quenching medium.

Description

Technical Field

[0001] The utility model relates to the technical field of metal processing, in particular to a pallet type continuous quenching furnace. Background Art

[0002] A quenching furnace is a device for metal heat treatment. It is mainly used to heat metal to a certain temperature, keep it warm for a period of time, and then quickly cool it to change the internal structure of the metal and improve its hardness and strength. Among them, the continuous quenching furnace is suitable for large-scale production lines. Workpieces continuously pass through the heating zone and the cooling zone through a conveyor belt. Using a pallet type conveyor belt to transport workpieces can ensure that the workpieces to be quenched are heated evenly and quickly, put into the quenching tank in the shortest time, avoid bending and torsion deformation caused by self-weight and heating, and keep the shape and mechanical properties of the workpieces uniform.

[0003] The cooling zone includes a quenching tank, which is a container for containing quenching medium. It is equipped with a spraying system and a conveying mechanism. To ensure the stability of quenching quality, the quenching medium in the quenching tank and the conveying mechanism need to be cleaned of impurities regularly.

[0004] The existing quenching tank cleaning device realizes the purpose of impurity removal by using a gear pump to filter the bath liquid in the quenching tank through a filter box and then return it to the quenching tank. However, it needs to be shut down for cleaning, which affects work efficiency. And single filtration can only clean the impurities floating in the quenching medium. During the quenching process, some carbon black and scale will fall off from the surface of the workpiece and deposit at the bottom of the quenching tank and adhere to the inner side wall of the quenching tank. It is difficult for the cleaning device to completely remove them, which affects the service life of the quenching tank and gradually pollutes the new quenching medium, making the quenching effect worse. Therefore, this application provides a pallet type continuous quenching furnace to meet the requirements. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a pallet type continuous quenching furnace for the deficiencies of the existing technology. By setting a filter mesh plate, the problem of low production efficiency caused by shutting down for cleaning the quenching medium is solved.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A pallet type continuous quenching furnace, including a quenching tank and a conveyor belt installed inside it. A stirrer is also arranged inside the quenching tank. The stirrer is located at the bottom of the conveyor belt. A driving mechanism for driving the stirrer to rotate is installed outside the quenching tank. The stirrer includes a stirring shaft detachably connected to the inner wall of the quenching tank. Stirring blades are fixedly connected to the outer side wall of the stirring shaft. Scrapers are fixedly connected to the sides of the stirring blades. A filter mesh plate covers the surface of the stirring blades. The filter mesh plate is inclined relative to the stirring blades and communicates with the inside of the stirring shaft.

[0007] Preferably, there are two sets of the stirring blades, and the two sets of the stirring blades are symmetrically distributed with the stirring shaft as the center.

[0008] Preferably, a plurality of groups of reinforcing ribs are arranged on the side wall of the stirring blade, and the reinforcing ribs are arc-shaped groove structures.

[0009] Preferably, a number of groups of pressure relief holes are formed on the surface of the stirring blade.

[0010] Preferably, the cross-section of the scraper is a crescent structure, and the tip of the scraper is inclined towards one side.

[0011] Preferably, a feed groove is formed on the side wall of the stirring shaft. There are two sets of the feed grooves and they are respectively located on the same side of the corresponding stirring blades.

[0012] Preferably, one side edge of the filter screen plate is fixedly connected to the stirring blade and is close to the scraper, and the other side of the filter screen plate extends into the feed groove and covers the notch of the groove.

[0013] Preferably, a number of groups of bent retaining pieces are arranged on the side edge of the filter screen plate extending into the feed groove. The bent retaining pieces are arc-shaped bent plate structures. The number of groups of the bent retaining pieces are spaced apart. A straight retaining piece is arranged between adjacent bent retaining pieces, and the straight retaining piece is a straight plate structure.

[0014] Preferably, both the bent retaining pieces and the straight retaining pieces are deformable thin plates, and there is a triangular gap between adjacent bent retaining pieces and straight retaining pieces.

[0015] Preferably, the driving mechanism can drive the stirring shaft to rotate. A spray pipe is installed on one side of the inner wall of the quenching tank, and the spray pipe is located above the conveyor belt.

[0016] The beneficial effects of the present utility model are as follows:

[0017] By providing a stirrer, the cooling rate of the quenching medium can be increased, which is beneficial to maintaining the quenching temperature of the quenching medium, and further improving the quenching effect of the workpiece.

[0018] By providing a filter screen plate, the quenching medium can be filtered, and the filtered impurities can be collected into the stirring shaft to keep the quenching medium clean. Furthermore, the quenching effect can be kept good without stopping the machine for filtering, which can effectively improve the working efficiency of workpiece quenching. At the same time, the filtered impurities are collected, which is convenient for later maintenance and cleaning, reduces the equipment maintenance workload, and improves the maintenance work efficiency.

[0019] By providing a scraper, the impurity caking at the bottom of the quenching tank can be effectively removed, preventing it from contaminating the quenching medium, keeping the quenching medium clean, thus maintaining good quenching quality. At the same time, it also avoids the influence of impurity caking on the service life of the quenching tank, and reduces the workload of later maintenance of the quenching tank, further improving the maintenance efficiency.

[0020] In summary, the utility model has the advantages of accelerating the cooling of the quenching medium, being able to clean the quenching medium without stopping the machine, keeping it clean, and thus maintaining excellent quenching effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of a tray-type continuous quenching furnace;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of a partial cross-section of the quenching tank;

[0023] Figure 3 It is a three-dimensional structural schematic diagram of the stirrer;

[0024] Figure 4 For Figure 3 The enlarged three-dimensional structural schematic diagram at position A in

[0025] Figure 5 For Figure 3 The enlarged three-dimensional structural schematic diagram at position B in

[0026] In the figure: 1. Quenching tank; 2. Conveyor belt; 3. Spray pipe; 4. Stirrer; 5. Driving mechanism; 6. Stirring shaft; 7. Stirring blade; 8. Scraper; 9. Reinforcing rib; 10. Pressure relief hole; 11. Filter screen plate; 12. Feed tank; 13. Bent baffle; 14. Straight baffle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and 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 cannot be understood as a limitation to the present utility model.

[0029] 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0030] Embodiment 1

[0031] Such as Figures 1-5As shown in the figure, this embodiment provides a tray-type continuous quenching furnace, which includes a quenching tank 1 and a conveyor belt 2 installed inside it. A stirrer 4 is also provided inside the quenching tank 1. Multiple groups of stirrers 4 can be provided and arranged in parallel. The stirrer 4 is located at the bottom of the conveyor belt 2. A driving mechanism 5 for driving the stirrer 4 to rotate is installed outside the quenching tank 1. The driving mechanism 5 includes a motor with a speed reducer. The motor base is fixedly connected to the quenching tank 1 through a bracket. The driving mechanism 5 also includes a chain drive connected to the stirrer 4. The chain drive includes a plurality of sprockets and chains that are meshed. Among them, the sprocket is connected to the corresponding stirrer, and the output shaft of the speed reducer is fixedly connected to one of the sprockets. (The driving mechanism 5 is a common technical means in the art, so it is not shown in this utility model). A spray pipe 3 is installed on one side of the inner wall of the quenching tank 1. The spray pipe 3 is located above the conveyor belt 2; The stirrer 4 includes a stirring shaft 6 detachably connected to the inner wall of the quenching tank 1. Both ends of the stirring shaft 6 are detachable end caps, and the end caps are fixedly connected to the stirring shaft, which is convenient for pouring out the impurities inside the stirring shaft 6. A telescopic shaft rod is provided on the end cap. The telescopic shaft rod includes an outer telescopic sleeve fixedly connected to the end cap of the stirring shaft 6. The outer end of the outer telescopic sleeve abuts against the inner wall of the quenching tank 1. An inner telescopic sleeve is provided inside the outer telescopic sleeve. A telescopic rod is provided inside the inner telescopic sleeve. A spring is also provided inside the inner telescopic sleeve. The spring is located at one end of the telescopic rod. Both ends of the spring abut against the inner wall of the inner telescopic sleeve and the end of the telescopic rod respectively. A first clamping block is provided in the inner telescopic sleeve. A first clamping groove adapted to the first clamping block is provided on the inner wall of the outer telescopic sleeve. The cooperation of the first clamping block and the first clamping groove is used for the limiting and guiding effect of the inner telescopic sleeve. Part of the inner telescopic sleeve extends outside the outer telescopic sleeve, which is convenient for the user to push the inner telescopic sleeve to move relative to the outer telescopic sleeve and simultaneously squeeze the spring. When the inner telescopic sleeve completely falls out of the outer telescopic sleeve, the stirring shaft 6 is separated from the quenching tank 1, and the stirrer 4 can be disassembled from the quenching tank 1. A second clamping block is fixedly connected to the outer wall of the telescopic rod. A second clamping groove adapted to the second clamping block is opened on the inner wall of the inner telescopic sleeve. The cooperation of the second clamping block and the second clamping groove is used for the limiting and guiding effect of the telescopic rod. The tail end of the telescopic rod penetrates the side wall of the quenching tank 1 and is connected to the sprocket in the driving mechanism 5. The rotation of the sprocket can drive the stirring shaft 6 to rotate synchronously. The stirring shaft 6 can be conveniently disassembled and installed through the telescopic shaft rod. (The telescopic shaft rod is prior art and is not shown in an enlarged view in this utility model). Stirring blades 7 are fixedly connected to the outer side wall of the stirring shaft 6. Scrapers 8 are fixedly connected to the sides of the stirring blades 7. A filter screen plate 11 covers the surface of the stirring blades 7. The filter screen plate 11 is inclined relative to the stirring blades 7 and is communicated with the inside of the stirring shaft 6.

[0032] By setting up the stirrer 4, driven by the driving mechanism 5, the stirrer 4 rotates and stirs the quenching medium in the quenching tank 1, increasing the contact surface between the quenching medium and the air, thereby enhancing the cooling rate of the quenching medium, facilitating the quenching medium to maintain the quenching temperature, and further improving the quenching effect of the workpiece. At the same time, by setting up the filter screen plate 11, it filters the quenching medium during the stirring process and collects the filtered impurities into the stirring shaft 6 to keep the quenching medium clean, thus maintaining a good quenching effect. Moreover, it does not require shutdown for filtration, which can effectively improve the working efficiency. Meanwhile, it collects the filtered impurities, facilitating later maintenance and cleaning, reducing the workload of equipment maintenance, and improving the maintenance efficiency. By setting up the scraper 8, during the stirring of the quenching medium, it can scrape the bottom of the quenching tank 1, effectively removing the impurity lumps at the bottom of the quenching tank 1, preventing them from contaminating the quenching medium, keeping the quenching medium clean, maintaining the cleanliness of the quenching tank 1, avoiding the influence of impurity lumps on the service life of the quenching tank 1, and at the same time reducing the workload of later maintenance of the quenching tank 1, further improving the maintenance efficiency.

[0033] As Figure 3 and Figure 4 shown, preferably, there are two groups of the stirring blades 7, and the two groups of stirring blades 7 are symmetrically distributed with the stirring shaft 6 as the center. Multiple groups of reinforcing ribs 9 are provided on the side wall of the stirring blade 7. The reinforcing rib 9 is an arc-shaped groove structure and is formed by stamping with a stamping machine, which can increase the strength of the stirring blade 7, enabling it to resist the impact of the quenching medium without deformation, effectively extending the service life of the stirring blade 7. A number of pressure relief holes 10 are formed on the surface of the stirring blade 7. By setting the pressure relief holes 10, when the stirring blade 7 stirs the quenching medium to flow, some of the quenching medium can leak out from the pressure relief holes 10, thereby reducing the pressure on the stirring blade 7 and further preventing the pressure on the stirring blade 7 from being too large and deforming, prolonging the service life of the stirring blade 7. The cross-section of the scraper 8 is a crescent structure, the tip of the scraper 8 is inclined towards one side, the scraper 8 is a deformable thin sheet, and the outer side wall of the scraper is tangent to the bottom of the quenching tank 1. During use, the inclined direction of the scraper 8 is the same as the rotation direction of the stirring blade 7, and the bottom of the scraper 8 contacts the bottom of the quenching tank 1. During the rotation of the stirring blade 7, the scraper 8 can continuously scrape the bottom of the quenching tank 1, cleaning the lumps adhered to the bottom of the quenching tank 1, improving the cleaning effect of the quenching tank 1, extending the service life of the quenching tank 1, and at the same time, the curved structure of the scraper 8 can shovel up the scraped lumps.

[0034] As Figure 4 and Figure 5As shown, a feed groove 12 is formed on the side wall of the stirring shaft 6. Preferably, there are two groups of feed grooves 12, which are respectively located on the same side of the corresponding stirring blades 7. One side edge of the filter screen plate 11 is fixedly connected to the stirring blade 7 and is close to the scraper 8. The connection between the filter screen plate 11 and the scraper 8 is smooth, facilitating the lumps shoveled by the scraper 8 to roll onto the filter screen plate 11 smoothly. The other side of the filter screen plate 11 extends into the feed groove 12 and covers the notch. Arc-shaped flanges are respectively arranged on both sides of the filter screen plate 11 close to the two ends of the stirring shaft 6, and the flanging direction is away from the stirring blade 7. The flanges can block the impurities on the filter screen plate 11, reduce the rolling of impurities, and guide the impurities to roll along the filter screen plate 11 into the feed groove 12. By arranging the filter screen plate 11, when the stirring blade 7 rotates and stirs the quenching medium to flow, the quenching medium will contact the stirring blade 7 after passing through the filter screen plate 11. The impurities in the quenching medium are driven to flow during the flowing process. When passing through the filter screen plate 11, the impurity particles will be filtered and stay on the filter screen plate 11. As the position of the filter screen plate 11 changes, under the action of gravity, the impurity particles will roll along the filter screen plate 11 to the feed groove 12 and enter the interior of the stirring shaft 6. By arranging the filter screen plate 11, not only can the impurities in the quenching medium be filtered, but also the filtered impurities can be collected, facilitating the recovery treatment of the impurities after impurity removal, thereby improving the cleaning efficiency.

[0035] A number of groups of bent retaining pieces 13 are arranged on the side edge of the filter screen plate 11 extending into the feed groove 12. The bent retaining pieces 13 are arc-shaped bent plate structures. A number of groups of bent retaining pieces 13 are distributed at intervals, and straight retaining pieces 14 are arranged between adjacent bent retaining pieces 13. The straight retaining pieces 14 are straight plate structures. Both the bent retaining pieces 13 and the straight retaining pieces 14 are deformable thin plates. There is a triangular gap between adjacent bent retaining pieces 13 and straight retaining pieces 14. During use, the bent retaining pieces 13 and the straight retaining pieces 14 can be bent and deformed under pressure, facilitating the bent retaining pieces 13 and the straight retaining pieces 14 to enter the feed groove 12 and connect with the stirring shaft 6. After the bent retaining pieces 13 and the straight retaining pieces 14 enter the feed groove 12, they block the notch of the feed groove 12. When the impurity particles filtered on the filter screen plate 11 roll to the bent retaining pieces 13 and the straight retaining pieces 14, they can enter the interior of the stirring shaft 6 through the gap between the bent retaining pieces 13 and the straight retaining pieces 14. However, for the impurity particles entering the interior of the stirring shaft 6, due to the lack of support, it is very difficult to leave the stirring shaft 6 from the gap between the bent retaining pieces 13 and the straight retaining pieces 14, thereby achieving the purpose of collecting impurity particles.

[0036] Working steps

[0037] During use, the drive mechanism 5 drives the agitator 4 to rotate, that is, the drive mechanism 5 drives the stirring shaft 6 to rotate relative to the quenching tank 1. When the stirring shaft 6 rotates, it drives the stirring blades 7 to rotate. When the stirring blades 7 rotate, they stir the quenching medium to roll, accelerating the cooling of the quenching medium. When the stirring blades 7 rotate and stir the quenching medium to flow, the quenching medium will contact the stirring blades 7 after passing through the filter mesh plate 11. During the flowing process of the quenching medium, it drives the impurity particles therein to flow. When passing through the filter mesh plate 11, the impurity particles will be filtered and stay on the filter mesh plate 11. And with the change of the position of the filter mesh plate 11, under the action of gravity, the impurity particles will roll along the filter mesh plate 11 to the feed trough 12 and enter the inside of the stirring shaft 6 along the gap between the bent baffle 13 and the straight baffle 14. The impurity particles entering the inside of the stirring shaft 6, due to the lack of support, it is very difficult to leave the stirring shaft 6 from the gap between the bent baffle 13 and the straight baffle 14 even if they keep tumbling inside the stirring shaft 6. Thus, the purpose of collecting impurity particles is achieved.

[0038] During the rotation of the stirring blades 7, the scraper 8 continuously scrapes against the bottom of the quenching tank 1, scraping off the impurity lumps formed at the bottom of the quenching tank 1 and flowing along with the rolling of the quenching medium. And during the continuous flowing process, they are filtered by the filter mesh plate 11 and finally enter the stirring shaft 6 to be collected. When the equipment is shut down for overall maintenance and cleaning, it is necessary to deal with the impurities inside the stirring shaft 6. First, by pressing the telescopic shaft rods at both ends of the stirring shaft 6, the stirring shaft 6 can be disassembled from the inner wall of the quenching tank 1, and the agitator 4 as a whole can be taken out of the quenching tank 1. Then, open the end covers at both ends of the stirring shaft 6, make the stirring shaft 6 vertical, and gently tap the outer wall of the stirring shaft 6 to shake off the aggregated impurity particles inside the stirring shaft 6. After cleaning and maintaining the inside of the stirring shaft 6, it can be reinstalled inside the quenching tank 1.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tray-type continuous quenching furnace, comprising a quenching tank and a conveyor belt installed therein, wherein a stirrer is further provided inside the quenching tank, wherein the stirrer is located at the bottom of the conveyor belt, and a driving mechanism for driving the stirrer to rotate is installed outside the quenching tank, characterized in that: The agitator includes a stirring shaft detachably connected to the inner wall of the quenching tank, a stirring blade fixedly connected to the outer wall of the stirring shaft, a scraper fixedly connected to the side of the stirring blade, and a filter screen plate covered on the surface of the stirring blade. The filter screen plate is inclined relative to the stirring blade and communicates with the interior of the stirring shaft.

2. A tray-type continuous quenching furnace according to claim 1, characterized in that: The stirring blades are provided in two groups, and the two groups of stirring blades are symmetrically distributed with the stirring shaft as the center.

3. A tray-type continuous quenching furnace according to claim 2, characterized in that: The side wall of the stirring blade is provided with a plurality of groups of reinforcing ribs, and the reinforcing ribs are arc-shaped groove structures.

4. A tray-type continuous quenching furnace according to claim 2, characterized in that: A plurality of pressure relief holes are provided on the surface of the stirring blade.

5. The support plate type continuous quenching furnace according to claim 1, characterized in that: The scraper has a cross section of a crescent structure, and the tip of the scraper is inclined toward one side.

6. The support plate type continuous quenching furnace according to claim 1, characterized in that: A feed groove is provided on the side wall of the stirring shaft, and two groups of the feed grooves are provided and are respectively located on the same side of the stirring blades.

7. A tray-type continuous quenching furnace according to claim 6, characterized in that: One side of the filter screen plate is fixedly connected to the stirring blade and is close to the scraper, and the other side of the filter screen plate extends into the feed trough and covers the notch.

8. The support plate type continuous quenching furnace according to claim 6, characterized in that: The side of the filter screen plate extending into the feed trough is provided with a plurality of groups of curved baffles, the curved baffles are arc-shaped curved plate structures, the plurality of groups of curved baffles are distributed at intervals, and straight baffles are provided between adjacent curved baffles, the straight baffles are straight plate structures.

9. A tray-type continuous quenching furnace according to claim 8, characterized in that: The curved baffles and the straight baffles are both deformable thin plates, and a triangular gap exists between adjacent curved baffles and straight baffles.

10. The support plate type continuous quenching furnace according to claim 1, characterized in that: The driving mechanism can drive the stirring shaft to rotate. A spray pipe is installed on one side of the inner wall of the quenching tank, and the spray pipe is located above the conveyor belt.

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