Vertical sand-burning furnace

Abstract

The present application relates to the technical field of casting, and discloses a vertical sand-burning furnace, which is divided into a buffer area, a sand-burning area and a cooling area in the hearth. The buffer area is connected with an inlet station, and the cooling area is connected with an outlet station. A movable ring chain is arranged in the hearth, and a bracket for storing sand bags or castings is hung on the ring chain. The bracket is driven by the ring chain to circulate through the buffer area, the sand-burning area and the cooling area in sequence, so that the continuous production of castings is realized. The sand-burning area comprises a plurality of sand-burning stations, and the cooling area comprises a plurality of cooling stations. The sand bags loaded on the bracket pass through the plurality of sand-burning stations in the sand-burning area and the plurality of cooling stations in the cooling area in sequence. The sand bags are heated once, and the quality of the castings is good, and the production capacity is high. In addition, when the sand bags are lifted in the sand-burning area by the ring chain, the residual sand of the sand bags on the upper layer has a certain heat, which can preheat the sand bags on the lower layer and flush away the residual sand on the surface of the sand bags, so that the heating time of the sand bags is shortened, and the heat energy utilization rate is improved.

Description

Technical Field

[0001] This invention relates to the field of casting technology, and more particularly to a vertical sand-firing furnace. Background Technology

[0002] Currently, the commonly used sand-burning furnaces in existing technologies are usually benchtop furnaces, which occupy a large space and can only produce intermittently, resulting in low production capacity. There are also many problems in the sand-burning process. For example, residual sand may accumulate around the casting during sand-burning, leading to incomplete sand-burning and requiring multiple sand-burning cycles, resulting in low production efficiency. In addition, benchtop furnaces have a long heating time and high energy consumption. Summary of the Invention

[0003] The purpose of this invention is to provide a vertical sand-firing furnace that occupies little space, enables continuous production, has high capacity, and can recover the heat generated during the cooling of castings, with short heating time and low energy consumption.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides a vertical sand-burning furnace, comprising:

[0006] The furnace body has an internal furnace chamber. The furnace body is equipped with a feed inlet, a discharge outlet, and a sand discharge outlet communicating with the furnace chamber. The feed inlet receives the feeding station, the discharge outlet receives the discharge station, and the sand discharge outlet receives the discharge area. The furnace chamber is divided into a buffer zone, a sand-firing zone, and a cooling zone. The sand-firing zone includes multiple sand-firing stations, and the cooling zone includes multiple cooling stations. The sand-firing stations are used to fire sandbags containing castings, and the cooling stations are used to cool the exposed castings after firing.

[0007] A movable device is installed on the furnace body. The movable device includes a movable chain, part of which is located inside the furnace chamber. Multiple lifting points are spaced apart on the chain, and brackets are hung at the lifting points. The brackets are used to store the sand bags or the castings. The chain drives the brackets to circulate sequentially through the buffer zone, the sand-burning zone, the cooling zone, and the material discharge zone.

[0008] Optionally, the moving device further includes a support and a first driving member disposed on the support. The support is fixed to the furnace body. The ring chain is a rectangular closed ring. The ring chain is disposed on the support and fixedly supported by the support. The ring chain is in rolling contact with the support. The first driving member is drivenly connected to the ring chain to drive the ring chain to move clockwise along a predetermined trajectory. The predetermined trajectory includes a vertically ascending section, a horizontal conveying section, a vertically descending section, and a horizontal reset section connected in sequence. The buffer area and the sand-burning area are located in the vertically ascending section, and the cooling area is located in the vertically descending section.

[0009] Optionally, the bracket includes four support rods extending horizontally, each of which is located at one corner of the chain, so that the chain forms a rectangular closed loop in a plane perpendicular to the support rods and has rounded transitions at the four corners.

[0010] Optionally, the buffer zone and the sand-burning zone are separated by a first switch door, which can be opened and closed; the sand-burning zone and the cooling zone are separated by a second switch door, which can be opened and closed.

[0011] Optionally, the vertical sand-burning furnace further includes a material collection device, which includes a collection hopper, a conveyor belt, and a sand-carrying vehicle. The collection hopper is positioned above the conveyor belt and corresponds to the sand drop outlet. After the residual sand in the collection hopper is collected, it falls onto the surface of the conveyor belt, and the conveyor belt transports the residual sand to the sand-carrying vehicle.

[0012] Optionally, a sand discharge port is provided below the buffer zone and the cooling zone respectively, the discharge station is configured as a grid, and three collection hoppers are provided, which are respectively located below the buffer zone, the cooling zone and the discharge station.

[0013] Optionally, the bottom of the collecting hopper is provided with a sand outlet, and a weighing device is provided inside the collecting hopper. The weighing device is used to weigh the weight of the residual sand in the collecting hopper, and the sand outlet opens when the weight reaches a set value.

[0014] Optionally, the side wall of the furnace body is provided with a number of burners spaced apart from each other at the position corresponding to the sand-burning zone. The burners are used to burn natural gas to provide the high-temperature environment required for burning the sand bags in the sand-burning zone.

[0015] Optionally, a circulating fan is provided in the sand-burning zone, which drives the air circulation in the sand-burning zone; an axial flow fan is provided in the cooling zone, which is used to draw cold air from outside the furnace into the cooling zone and discharge the high-temperature air in the cooling zone to the sand-burning zone.

[0016] Optionally, the vertical sand-burning furnace further includes a flue gas extraction and treatment system, which is connected to the top of the furnace body.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention provides a vertical sand-firing furnace, the furnace body of which forms a furnace chamber divided into a buffer zone, a sand-firing zone, and a cooling zone. The buffer zone receives the feeding station, and the cooling zone receives the discharging station. A movable chain is installed inside the furnace chamber, with multiple lifting points spaced apart on the chain. Each lifting point has a bracket for holding sand bags or castings. The chain can drive the brackets to circulate sequentially through the buffer zone, sand-firing zone, and cooling zone, thereby achieving continuous casting production. The sand-firing zone includes multiple sand-firing stations, and the cooling zone includes multiple cooling stations. The chain can drive the sand bags carrying the brackets to pass sequentially through the multiple sand-firing stations in the sand-firing zone and the multiple cooling stations in the cooling zone, completing the sand-firing in one operation. The resulting castings have good quality, eliminating the need for multiple firings and achieving high production capacity. In addition, when the chain drives the sandbags to rise in the sand-burning zone, the residual sand falling from the upper sandbags has a certain amount of heat, which can preheat the lower sandbags and wash away the loose residual sand on the surface of the sandbags, so as to shorten the heating time of the sandbags and improve the utilization rate of heat energy. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0020] Figure 1 This is a front view of the vertical sand-burning furnace provided in an embodiment of the present invention;

[0021] Figure 2 This is a left view of the vertical sand-burning furnace provided in an embodiment of the present invention;

[0022] Figure 3 This is a top view of the vertical sand-burning furnace provided in an embodiment of the present invention;

[0023] Figure 4 This is a front view of the tray provided in an embodiment of the present invention;

[0024] Figure 5 This is a top view of the tray provided in an embodiment of the present invention.

[0025] In the picture:

[0026] 10. Sandbags; 20. Castings; 30. Pallets; 40. Pit;

[0027] 100. Furnace body; 101. Feeding station; 102. Discharging station; 103. Dropping area; 104. Buffer area; 105. Sand burning area; 106. Cooling area; 107. First opening door; 108. Second opening door; 109. Burner; 200. Chain; 201. Bracket; 202. Support rod; 300. Dropping material collection device; 301. Collection hopper; 302. Conveyor belt; 303. Sand transport vehicle; 400. Connecting pipeline; 500. Chimney. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0035] like Figures 1-3 As shown, this embodiment provides a vertical sand-burning furnace, including a furnace body 100 and a movable device disposed within the furnace body 100. The furnace body 100 can be disposed above a pit 40. The bottom of the furnace body 100 is flush with the ground. A furnace chamber is formed inside the furnace body 100. Feed inlets and discharge outlets communicating with the furnace chamber are provided on opposite side walls of the furnace body 100. A sand-falling outlet is provided at the bottom of the furnace body 100. The feed inlet receives the feed station 101, and the discharge outlet receives the discharge station 102. Both the feed station 101 and the discharge station 102 are disposed on the ground. A falling area 103 is formed within the pit 40, and the sand-falling outlet receives the falling area 103 formed by the pit 40.

[0036] Furthermore, the furnace is divided into a buffer zone 104, a sand-burning zone 105, and a cooling zone 106. The buffer zone 104 is connected to the feed inlet, selectively connected to the sand-burning zone 105, selectively connected to the cooling zone 106, and connected to the discharge outlet. Optionally, the moving device includes a movable chain 200, part of which is located inside the furnace. Multiple lifting points are spaced along the chain 200, and brackets 201 are hung at these points. The brackets 201 are used to store sand bags 10 or castings 20. The chain 200 drives the brackets 201 to circulate sequentially through the buffer zone 104, the sand-burning zone 105, the cooling zone 106, and the discharge zone 103. Because the chain 200 can circulate between these zones, continuous production of the castings 20 is achieved.

[0037] For example, in this embodiment, the sand-firing zone 105 includes multiple sand-firing stations, and the cooling zone 106 includes multiple cooling stations. Sand bags 10 containing castings 20 enter the buffer zone 104 within the furnace body 100 from the feeding station 101 through the feeding port. Then, the sand bags 10 enter the sand-firing zone 105 from the buffer zone 104. A chain 200 drives a bracket 201 carrying the sand bags 10 to sequentially pass through multiple sand-firing stations within the sand-firing zone 105, stopping at each station for a period of time to fire the sand bags 10 containing castings 20. After the casting 20 inside the bag 10 is fired in the sand-firing zone 105, it is exposed. The residual sand that falls during the firing process falls into the pit 40 through the sand drop port. After firing, the exposed casting 20 is transferred to the cooling zone 106 by the chain 200. The bracket 201 carrying the casting 20 continues to pass through multiple cooling stations in the cooling zone 106 in sequence, and stays at each cooling station for the same amount of time. The casting 20 is cooled at the corresponding cooling station. After cooling, the casting 20 finally leaves the furnace body 100 through the discharge port and is transferred to the discharge station 102. Thus, when the chain 200 drives the sand bag 10 carrying the bracket 201 through multiple sand-burning stations in the sand-burning zone 105 and multiple cooling stations in the cooling zone 106, the sand-burning is completed in one go. The finished casting 20 has good quality and does not need to be burned multiple times. Furthermore, because there are multiple sand-burning stations and multiple cooling stations, the vertical sand-burning furnace can process multiple parts to be processed at the same time, and the firing process can be carried out continuously, which is conducive to improving the production capacity of the vertical sand-burning furnace.

[0038] In addition, when the chain 200 drives the sandbag 10 to rise in the sand-burning zone 105, the residual sand falling from the upper sandbag 10 has a certain amount of heat, which can preheat the lower sandbag 10 and wash away the loose residual sand on the surface of the sandbag 10, so as to shorten the heating time of the sandbag 10. For example, the heating time can be shortened to within two hours, which greatly speeds up the firing process of the casting 20, while improving the utilization rate of heat energy and avoiding heat energy waste.

[0039] As an optional solution, the ring chain 200 in this embodiment is a stepping movement. Specifically, the moving device includes a bracket and a first driving component mounted on the bracket. The first driving component is a servo motor. The bracket is fixed to the furnace body 100. The ring chain 200 is a rectangular closed ring, mounted on the bracket and fixedly supported by the bracket. The upper part of the ring chain 200 is located inside the furnace chamber, and the lower part of the ring chain 200 is located in the material dropping area 103. The ring chain 200 is in rolling contact with the bracket. The first driving component is connected to the ring chain 200 in a transmission manner, thereby... A driving component can drive the chain 200 to move clockwise along a predetermined trajectory. The predetermined trajectory is rectangular and includes a vertically ascending section, a horizontal conveying section, a vertically descending section, and a horizontal reset section connected in sequence. The buffer zone 104 and the sand-burning zone 105 are located in the vertically ascending section, the cooling zone 106 is located in the vertically descending section, and the material-dropping zone 103 is located in the horizontal reset section. In this embodiment, the process of the chain 200 driving the bracket 201 upward completes the sand-burning process, and the process of the chain 200 driving the bracket 201 downward completes the cooling process of the casting 20. When the first driving component drives the chain 200 to move, the first driving component stops for a period of time after the hoisting point on the chain 200 moves to the corresponding sand-burning or cooling station. At this time, the sand bag 10 located in the sand-burning station can undergo the burning process, and the casting 20 located in the cooling station can undergo the cooling process simultaneously. The specific stopping time of the first driving component can be adjusted according to the required burning time of the sand bag 10, and the sand-burning time is adjustable and controllable.

[0040] Furthermore, the support includes four horizontally extending support rods 202, each support rod 202 being positioned at one corner of the chain 200, so that the chain 200 forms a rectangular closed loop in a plane perpendicular to the support rods 202, with rounded transitions at the four corners. More preferably, to avoid direct friction between the chain 200 and the support rods 202, rotatable gears can be provided on the support rods 202, which can mesh with the chain 200.

[0041] Optionally, see [link to relevant documentation] Figure 1 and Figure 2 In this embodiment, the bracket 201 is square, and two links 200 are provided. The two links 200 are respectively located on both sides of the bracket 201 and connected to both ends of the support rod 202, so as to better suspend the bracket 201, keep it under force balance, and make the entire conveying process more stable. Furthermore, each lifting point on the links 200 includes a lifting rod and a lifting rope. One link 200 is connected to each end of the lifting rod, and the lifting rope connects the bracket 201 and the lifting rod. The bracket 201 is suspended on the lifting rod by the lifting rope, and the lifting rod is fixed to the links 200.

[0042] More preferably, see Figure 4 and Figure 5The vertical sand-firing furnace in this embodiment also includes a tray 30, which is also square in shape. The tray 30 is used to support the sand bag 10 or the casting 20. When the sand bag 10 enters the furnace from the feeding station 101, flows through various areas in the furnace, and exits the furnace to the discharge station 102, both the sand bag 10 and the casting 20 are placed on the tray 30 throughout the entire process. The tray 30 facilitates the handling of the sand bag 10 or the casting 20. Furthermore, the tray 30 in this embodiment is designed as a grid, which facilitates the falling off of residual sand after the sand bag 10 is fired, preventing residual sand from accumulating around the sand bag 10 and causing the casting 20 to require multiple firings, resulting in a high yield of the fired casting 20.

[0043] Further, see also Figure 1 and Figure 3 In this embodiment, the feeding station 101 extends through the feeding port to the buffer area 104. The feeding station 101 includes multiple rollers that form a roller conveyor. The roller conveyor facilitates the pushing of the tray 30 carrying the sandbag 10 into the buffer area 104 inside the furnace. When the chain 200 drives the bracket 201 to be level with the feeding station 101, the sandbag 10 and the tray 30 can be pushed onto the bracket 201 suspended on the chain 200 by a cylinder or the like. Optionally, the bracket 201 can also be configured with a roller conveyor structure formed by multiple rotatable rollers, thereby reducing the resistance between the bracket 201 and the tray 30 and making it easier to apply force. Of course, the discharge station 102 extends through the discharge port to the cooling zone 106. Similarly, the discharge station 102 also includes multiple rollers, which form a roller conveyor. The roller conveyor facilitates pushing the tray 30 carrying the casting 20 away from the cooling zone 106 in the furnace. When the chain 200 drives the corresponding bracket 201 to be flush with the discharge station 102, the casting 20 and the tray 30 can also be pushed to the discharge station 102 by a cylinder or the like. Optionally, the bracket 201 can also be configured with a roller conveyor structure formed by multiple rotatable rollers, thereby reducing the resistance between the bracket 201 and the tray 30 and making it easier to apply force.

[0044] See also Figure 1In this embodiment, the sand-burning zone 105 is located above the buffer zone 104, and the cooling zone 106 is located to the right of the sand-burning zone 105 and the buffer zone 104. The cooling zone 106 is separated from the sand-burning zone 105 and the buffer zone 104 by a partition. The internal components of the entire furnace body 100 are relatively concentrated, occupying little space. The buffer zone 104 and the sand-burning zone 105 are separated by a first switch door 107. The first switch door 107 can be opened and closed. When the first switch door 107 is open, the buffer zone 104 and the sand-burning zone 105 are connected. When the first switch door 107 is closed, the buffer zone 104 and the sand-burning zone 105 are separated, and the sand-burning zone 105 is in a closed state. Furthermore, the sand-burning zone 105 and the cooling zone 106 are separated by a second switch door 108. The second switch door 108 can be opened and closed. When the second switch door 108 is open, the cooling zone 106 is connected to the sand-burning zone 105. When the second switch door 108 is closed, the cooling zone 106 is separated from the sand-burning zone 105. For example, in this embodiment, both the first switch door 107 and the second switch door 108 are inductive switches. When the first switch door 107 or the second switch door 108 senses the approach of the bracket 201, the first switch door 107 or the second switch door 108 opens laterally. After the bracket 201 passes the first switch door 107 or the second switch door 108, the first switch door 107 or the second switch door 108 closes. This realizes the automated control of the first switch door 107 or the second switch door 108, and the vertical sand-burning furnace achieves automated continuous production without human intervention, resulting in high production capacity. In addition, sand drop outlets are provided below the buffer zone 104 and the cooling zone 106. When the first switch door 107 or the second switch door 108 is opened, the residual sand that falls above the first switch door 107 or the second switch door 108 will be pushed down and fall into the sand drop area of ​​the pit 40 through the corresponding sand drop outlet.

[0045] Furthermore, in this embodiment, a material collection device 300 is also provided in the sand drop area of ​​the pit 40. The material collection device 300 includes a collection hopper 301, a conveyor belt 302, and a sand transport vehicle 303. The collection hopper 301 is located above the conveyor belt 302 and is positioned corresponding to the sand drop outlet. The collection hopper 301 can collect residual sand falling from the sand drop outlet. After a certain amount of residual sand is accumulated in the collection hopper 301, it continues to fall onto the surface of the conveyor belt 302. The conveyor belt 302 transports the residual sand to the sand transport vehicle 303, which then transfers the residual sand to the sand regeneration system for regeneration. Exemplarily, the conveyor belt 302 can be driven to move by a second driving component. The specific arrangement of the conveyor belt 302 and the power transmission method are common technical means in the prior art and will not be described in detail here. Of course, in some embodiments, the material collection device 300 may not be provided. When the residual sand in the pit 40 accumulates to a certain extent, it is also feasible to clean it manually or by using a loader.

[0046] Optionally, in this embodiment, a sand discharge port is provided below the buffer zone 104 and the cooling zone 106 respectively, the discharge station 102 is configured as a grid, and three collection hoppers 301 are provided, which are respectively located below the buffer zone 104, the cooling zone 106, and the discharge station 102 to collect residual sand. Of course, in other embodiments, only one elongated collection hopper 301 may be provided, the opening of which covers the corresponding areas below the buffer zone 104, the cooling zone 106, and the discharge station 102 to collect residual sand.

[0047] More preferably, in this embodiment, each collecting hopper 301 is provided with a sand discharge port at its bottom end, and a weighing device is provided inside the collecting hopper 301. The weighing device is used to weigh the weight of the residual sand in the collecting hopper 301. When the weight of the residual sand reaches a set value (e.g., 15kg, or other weights), the sand discharge port opens, and the residual sand in the collecting hopper 301 falls onto the conveyor belt 302. The entire process of collecting residual material can also be automated.

[0048] See also Figure 1 In this embodiment, a plurality of burners 109 are provided at intervals on the side wall of the furnace body 100 corresponding to the position of the sand-burning zone 105. The burners 109 can be used to burn natural gas, thereby providing the high-temperature environment required for burning the sand bags 10 in the sand-burning zone 105. Of course, by controlling the amount of natural gas entering the furnace, the combustion rate and intensity of the burners 109 can be adjusted to regulate the temperature in the sand-burning zone 105.

[0049] Furthermore, in this embodiment, a circulating fan is provided in the sand-firing zone 105. The circulating fan can drive the air circulation within the sand-firing zone 105 to ensure that the temperature of the sand bags 10 at each sand-firing station is consistent, thereby ensuring that the finished casting 20 is fired well. More preferably, in this embodiment, an axial flow fan is provided in the cooling zone 106. The axial flow fan is connected to the sand-firing zone 105 through a connecting pipe 400. The axial flow fan can draw cold air from outside the furnace into the cooling zone 106 to quickly cool the casting 20. At the same time, the axial flow fan exhausts the high-temperature air in the cooling zone 106 into the sand-firing zone 105, and the heat generated by the cooling of the casting 20 is reused in the sand-firing zone 105 to aid combustion, realizing heat recovery and helping to reduce energy consumption.

[0050] In addition, the vertical sand-burning furnace in this embodiment also includes a flue gas extraction and treatment system, which is connected to the top of the furnace body 100. Specifically, a chimney 500 is provided at the top of the furnace body 100. The flue gas extraction and treatment system includes a fan, a filter device, and an exhaust gas treatment device. The chimney 500 is connected to the fan, the fan is connected to the filter device, and the filter device is connected to the exhaust gas treatment device. The flue gas in the sand-burning zone 105 gathers at the top of the furnace body 100 and is drawn away by the fan through the chimney 500. After being treated by the filter device and the exhaust gas treatment device, the flue gas is discharged into the atmosphere. The flue gas from the entire sand-burning process is collected and treated centrally. At the same time, the flue gas extraction and treatment system has good sealing performance, which prevents smoke from billowing everywhere at the top of the furnace body 100, causing the workshop to be filled with smoke, thus helping to protect the environment.

[0051] Workflow:

[0052] After the chain 200 drives the empty bracket 201 to be level with the feeding station 101, the cylinder pushes the pallet 30 carrying the sand bag 10 onto the bracket 201 suspended on the chain 200. Then the chain 200 starts to rotate, and the bracket 201 located in the buffer area 104 moves upward under the drive of the chain 200. When the bracket 201 moves to the first opening and closing door 107, the first opening and closing door 107 senses the presence of the bracket 201 and opens horizontally. Then the chain 200 continues to drive the bracket 201 into the sand burning area 105. At the same time, the residual sand (hot sand) on the first opening and closing door 107 falls into the material collection device 300 in the pit 40.

[0053] As the support frame 201 rises within the sand-firing zone 105, the hot sand already fired from the sandbags 10 on the upper support frame 201 drips onto the sandbags 10 on the lower support frame 201, thus preheating the sandbags 10 and shortening the heating time. After a period of time, the support frame 201 continues through multiple sand-firing stations to ensure that each support frame 201 is kept at a high temperature (the temperature required for firing the sandbags 10) for a certain period of time (the required firing time for the sandbags 10). Then, after the support frame 201 passes through the vertical rising section and the horizontal conveying section, Approaching the outlet of the sand-burning zone 105 (i.e., at the second switch door 108), when the second switch door 108 senses the bracket 201, the second switch door 108 opens horizontally, and at the same time, the residual sand (hot sand) on the second switch door 108 falls into the material collection device 300 in the pit 40. The chain 200 continues to drive the bracket 201 to descend vertically into the cooling zone 106. At this time, almost all the residual sand outside the casting 20 falls off, and the casting 20 is exposed. At the same time, the heat generated during the cooling process of the casting 20 is recycled back to the sand-burning zone 105 for combustion through the circulating fan.

[0054] Subsequently, as the chain 200 passes through the vertical descent section and the bracket 201 descends to be level with the discharge station 102, the casting 20 on the bracket 201 is again pushed onto the discharge station 102 by the cylinder. At this point, for some smaller castings 20, the residual sand inside the casting 20 can be manually removed, as well as some remaining sand. This sand falls into the discharge collection device 300 after passing through the grid of the discharge station 102. Of course, for some heavier large castings 20, it is necessary to use a hoisting and tilting device to dump the sand inside the casting 20. When the residual sand in the three collection hoppers 301 of the material collection device 300 accumulates to the set value, the discharge port of the collection hopper 301 opens, and the residual sand falls onto the conveyor belt 302. It is then transported by the conveyor belt 302 to the sand transport vehicle 303. The sand transport vehicle 303 then transports the residual sand to the sand recycling system, and the bracket 201 is emptied. Afterwards, the bracket 201, driven by the ring chain 200, passes through the horizontal reset section and continues to move until it is level with the feeding station 101, entering the next cycle.

[0055] Obviously, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

[0056] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A vertical sand-burning furnace, characterized in that, include: A furnace body (100) is provided with a furnace chamber inside the furnace body (100). The furnace body (100) is provided with a feed port, a discharge port and a sand drop port that communicate with the furnace chamber. The feed port receives the feed station (101), the discharge port receives the discharge station (102), and the sand drop port receives the drop area (103). The furnace chamber is divided into a buffer area (104), a sand burning area (105) and a cooling area (106). The sand burning area (105) includes multiple sand burning stations, and the cooling area (106) includes multiple cooling stations. The sand burning stations are used to burn sand bags (10) that wrap the casting (20). The cooling stations are used to cool the exposed casting (20) after burning. A moving device is installed on the furnace body (100). The moving device includes a movable chain (200). Part of the chain (200) is located inside the furnace chamber. Multiple lifting points are spaced apart on the chain (200). A bracket (201) is hung on the lifting point. The bracket (201) is used to store the sand bag (10) or the casting (20). The chain (200) drives the bracket (201) to pass through the buffer zone (104), the sand burning zone (105), the cooling zone (106), and the material dropping zone (103) in sequence. The moving device further includes a bracket and a first driving member disposed on the bracket. The bracket is fixed on the furnace body (100). The ring chain (200) is a rectangular closed ring. The ring chain (200) is disposed on the bracket and fixedly supported by the bracket. The ring chain (200) is in rolling contact with the bracket. The first driving member is connected to the ring chain (200) for transmission, so as to drive the ring chain (200) to move along a predetermined trajectory in a clockwise direction. The predetermined trajectory includes a vertical rising section, a horizontal conveying section, a vertical falling section and a horizontal reset section connected in sequence. The buffer area (104) and the sand burning area (105) are located in the vertical rising section, and the cooling area (106) is located in the vertical falling section. The bracket includes four support rods (202) extending horizontally, each of the support rods (202) being disposed at one corner of the ring chain (200), so that the ring chain (200) is a rectangular closed ring in a plane perpendicular to the support rods (202) and has rounded transitions at the four corners; The buffer zone (104) and the sand-burning zone (105) are separated by a first switch door (107), which can be opened and closed; the sand-burning zone (105) and the cooling zone (106) are separated by a second switch door (108), which can be opened and closed. The vertical sand-burning furnace also includes a material collection device (300), which includes a collection hopper (301), a conveyor belt (302), and a sand transport vehicle (303). The collection hopper (301) is located above the conveyor belt (302) and is positioned corresponding to the sand drop outlet. After the residual sand in the collection hopper (301) is collected, it falls onto the surface of the conveyor belt (302), and the conveyor belt (302) transports the residual sand to the sand transport vehicle (303).

2. The vertical sand-burning oven according to claim 1, characterized in that The buffer zone (104) and the cooling zone (106) are respectively provided with a sand drop port below them. The discharge station (102) is set in the shape of a grid. There are three collection hoppers (301), and the three collection hoppers (301) are respectively located below the buffer zone (104), the cooling zone (106) and the discharge station (102).

3. The vertical sand-burning furnace according to claim 1, characterized in that, The bottom end of the collecting hopper (301) is provided with a sand outlet, and the collecting hopper (301) is provided with a weighing device. The weighing device is used to weigh the weight of the residual sand in the collecting hopper (301). When the weight reaches a set value, the sand outlet opens.

4. The vertical sand-burning furnace according to any one of claims 1-3, characterized in that, The side wall of the furnace body (100) is provided with a number of burners (109) spaced apart from the position of the sand burning zone (105). The burners (109) are used to burn natural gas to provide the high-temperature environment required for burning the sand bag (10) in the sand burning zone (105).

5. The vertical sand-burning furnace according to any one of claims 1-3, characterized in that, The burning zone (105) is equipped with a circulating fan, which drives the air circulation in the burning zone (105); the cooling zone (106) is equipped with an axial flow fan, which is used to draw cold air from outside the furnace into the cooling zone (106) and discharge the high-temperature air in the cooling zone (106) to the burning zone (105).

6. The vertical sand-burning furnace according to any one of claims 1-3, characterized in that, The vertical sand-burning furnace also includes a flue gas extraction system, which is connected to the top of the furnace body (100).

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