A vertical sand core drying apparatus

Abstract

The utility model relates to a vertical sand core drying equipment, including drying box and tray, drying box bottom both sides are equipped with feeding opening and discharge gate, be equipped with vertical circulating conveying system in drying box, a plurality of tray evenly distributed are equipped in vertical circulating conveying system, vertical circulating conveying system is used for reciprocating circulation conveying tray in vertical direction, drying box top is equipped with hot flow supply system, is used for forming the hot air current that a plurality of downward flow in drying box and is located vertical circulating conveying system top department, to the sand core that places on the tray carries out drying, drying box bottom one side is equipped with the mechanism of pushing away, the utility model discloses through vertical circulating conveying system drive tray vertical reciprocating circulation conveying, when loading and unloading replacement to sand core at feeding opening and discharge gate, the rest sand core can normally dry, makes and can carry out simultaneously with drying, reduces equipment idle waiting time, promotes drying efficiency and equipment utilization.

Description

Technical Field

[0001] This utility model relates to the field of sand core drying technology, specifically a vertical sand core drying device. Background Technology

[0002] To eliminate internal moisture and promote full curing of the binder, the sand core needs to be dried after it is made. The dried sand core has more open pores and better air permeability, which can further help the gas inside the mold cavity to be discharged smoothly during casting, so as to ensure the dimensional accuracy, surface quality and mechanical properties of the casting.

[0003] The drying racks in existing sand core drying equipment are usually fixed in position and used to place one or more sand cores for drying. However, these drying racks cannot be rotated within the drying equipment. The next batch of sand cores can only be loaded and unloaded after the previous batch has been dried. There is idle waiting time between loading and unloading, resulting in low drying efficiency and significantly insufficient equipment utilization. Utility Model Content

[0004] The purpose of this invention is to provide a vertical sand core drying device that effectively solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] A vertical sand core drying device includes a drying chamber and trays. The bottom of the drying chamber has an inlet and an outlet on both sides. A vertical circulating conveyor system is installed inside the drying chamber, with several trays evenly distributed on the system. The vertical circulating conveyor system is used to reciprocate and circulate the trays vertically. A heat supply system is installed at the top of the drying chamber to create multiple downward-flowing hot air streams inside the drying chamber and above the vertical circulating conveyor system to dry the sand cores placed on the trays. A pushing mechanism is installed on one side of the bottom of the drying chamber to tilt the trays towards the inlet or outlet for easy loading and unloading.

[0007] Furthermore, the vertical circulating conveyor system includes shafts, sprockets, transmission chains, and a drive motor; two shafts are symmetrically mounted inside the drying chamber, and the drive motor is fixed to one side of the outer wall of the drying chamber, with its output shaft fixedly connected to one end of one of the shafts; sprockets are fixedly mounted on both shafts near their ends, and transmission chains are mounted on the two sprockets on the same side; trays are evenly distributed between the two transmission chains.

[0008] Furthermore, circular sleeves are evenly distributed on both transmission chains, with one circular sleeve on each transmission chain corresponding to the other; a rotating rod is rotatably installed inside each circular sleeve, and the tray is fixed between the corresponding two rotating rods; a counterweight is fixed to the end of each rotating rod.

[0009] Furthermore, the heat supply system includes an inlet pipe, shelves, and nozzles; two shelves are fixed at the top of the drying chamber, forming a cavity between them; nozzles are evenly distributed on the lower shelf, each communicating with the cavity; the inlet pipe is fixed at the top of the drying chamber, its top end is connected to the hot air blower through a pipe, and its bottom end passes through the top of the drying chamber and the upper shelf, communicating with the cavity.

[0010] Furthermore, heating elements are evenly distributed within the clamping cavity; the heating elements are electric heating tubes.

[0011] Furthermore, the pushing mechanism includes a power guide rail, a telescopic rod, and a U-shaped pusher; the power guide rail is fixed to one side of the bottom inside the drying chamber, and the telescopic rod is vertically fixed to the top of the movable seat on the power guide rail; the U-shaped pusher is fixed to the telescopic end at the top of the telescopic rod and engages with the counterweight block that moves to the bottom on the corresponding side.

[0012] Furthermore, when the telescopic rod retracts to its limit position, the U-shaped pusher is lower than the counterweight block that has reached its lowest position.

[0013] Furthermore, both sides of the drying chamber are fixed with downward-facing suction hoods located above the feed inlet and discharge outlet; the top of each suction hood is connected to a suction pipe, and the ends of each suction pipe are connected to the thermal exhaust gas treatment system.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows.

[0015] The vertical circulating conveyor system drives the pallets to reciprocate vertically. When the sand cores are loaded and unloaded at the loading and unloading ports, the remaining sand cores can be dried normally. This allows the replacement and drying to be carried out simultaneously, reducing equipment idle waiting time and improving drying efficiency and equipment utilization.

[0016] The bottom pallet is tilted by a pushing mechanism to facilitate loading and unloading. The loading and unloading areas are distributed on opposite sides to separate dry and wet sand cores, avoiding material mixing and interference with the feeding line. At the same time, it relieves the pressure of material accumulation and optimizes the production operation rhythm.

[0017] The counterweight helps to keep the pallet level during the vertical conveying system, preventing the sand core from slipping due to the pallet tilting and ensuring the stability of the sand core conveying process.

[0018] The heat supply system generates multiple downward-flowing hot air streams, whose heat gradually decreases with loss, creating a gradient change between low-temperature, high-temperature, and low-temperature zones. The vertical circulating conveyor system drives the tray through each temperature zone in sequence, achieving gradient drying of the sand core. The initial low-temperature preheating promotes slow evaporation of moisture and prevents surface crusting from clogging the pores. The high temperature quickly removes residual moisture and promotes full curing of the binder. The subsequent low temperature relieves thermal stress and effectively improves the quality of sand core forming. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model; Figure 2 This is a partial structural diagram of the internal structure of the drying oven in this utility model; Figure 3 This is a schematic diagram of the vertical circulating conveyor system in this utility model; Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of the heat supply system structure in this utility model; Figure 6 This is a schematic diagram of the pushing mechanism in this utility model.

[0020] In the diagram: 1. Drying oven; 11. Feed inlet; 12. Discharge inlet; 2. Vertical circulating conveyor system; 21. Shaft; 22. Sprocket; 23. Transmission chain; 24. Drive motor; 25. Circular sleeve; 26. Rotating rod; 27. Counterweight; 3. Tray; 4. Heat supply system; 41. Inlet pipe; 42. Shelf; 43. Clamping cavity; 44. Spray nozzle; 45. Heating element; 5. Pushing mechanism; 51. Power guide rail; 52. Moving seat; 53. Telescopic rod; 54. U-shaped push frame; 6. Suction hood; 61. Suction pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of this utility model, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to 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 embodiments of this utility model.

[0023] In this embodiment of the invention, 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 number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Example 1

[0024] Please see Figures 1-6 The present invention provides a vertical sand core drying device, including a drying box 1 and a tray 3. The drying box 1 is arranged vertically, and the bottom sides of the drying box 1 are respectively provided with a feeding port 11 and a discharging port 12. Both the feeding port 11 and the discharging port 12 are provided with sliding or rotating door panels (not shown in the figure) so that the feeding port 11 and the discharging port 12 can be blocked when the sand core in the drying box 1 needs to be continuously dried, so as to avoid excessive heat loss in the drying box 1.

[0025] The drying chamber 1 is equipped with a vertical circulating conveyor system 2, and several trays 3 are evenly distributed on the vertical circulating conveyor system 2. The vertical circulating conveyor system 2 is used to reciprocate and circulate the trays 3 in the vertical direction. The top of the drying chamber 1 is equipped with a heat supply system 4, which is used to form multiple downward flowing hot air streams in the drying chamber 1 and above the vertical circulating conveyor system 2. The vertical circulating conveyor system 2 is used to reciprocate and circulate the trays 3 on which sand cores are placed along the running track. The heat supply system 4 works at the top of the drying chamber 1 to generate downward hot air streams, which can dry the sand cores. When the tray 3 runs to the bottom, its two sides correspond to the positions of the loading port 11 and the unloading port 12, respectively. The dried sand cores on the tray 3 are unloaded and taken out from the unloading port 12, and the sand cores to be dried are placed on the tray 3 from the loading port 11, thereby realizing the loading, unloading and replacement of sand cores.

[0026] When the sand core is loaded and unloaded and replaced at the bottom of the tray 3, the sand cores placed on the other trays 3 can be dried normally. In addition, the tray 3 has a groove. When the sand core is placed in the groove, the side of the groove acts as a barrier to prevent the sand core from slipping off the side of the tray 3. Furthermore, the tray 3 can hold a single sand core or multiple sand cores at the same time.

[0027] In addition, if the sand core needs to undergo a long drying period, close the door panels at the feed port 11 and the discharge port 12. After the drying time reaches the predetermined duration, open the doors to load, unload and replace the sand core accordingly. Example 2

[0028] Please see Figure 3 In conjunction with Embodiment 1, this embodiment will explain and describe the vertical circulating conveyor system 2 as follows: The vertical circulating conveyor system 2 includes shafts 21, sprockets 22, transmission chains 23, and a drive motor 24. Two shafts 21 are symmetrically mounted inside the drying chamber 1. The drive motor 24 is fixed to one side of the outer wall of the drying chamber 1, and its output shaft is fixedly connected to one end of one of the shafts 21. Sprockets 22 are fixedly mounted on both shafts 21 near their ends. The two sprockets 22 on the same side are connected by a transmission chain 23. The trays 3 are evenly distributed between the two transmission chains 23. When the drive motor 24 works, its output shaft drives the corresponding shaft 21 and sprocket 22 to rotate. Under the meshing transmission action of the transmission chain 23 and the sprocket 22, the other shaft 21 is driven to rotate, so that the two transmission chains 23 can operate synchronously to drive the evenly distributed trays 3 to reciprocate in a vertical circular motion.

[0029] Among them, such as Figure 4 As shown, circular sleeves 25 are evenly distributed on the two transmission chains 23, with each circular sleeve 25 corresponding to the other. A rotating rod 26 is rotatably installed inside each circular sleeve 25. The pallets 3 are fixed between the corresponding two rotating rods 26. A counterweight 27 is fixed to the end of each rotating rod 26. The weight of the counterweight 27 is greater than the sum of the weights of the pallet 3 and the sand core. By rotating the rotating rods 26 and circular sleeves 25, each pallet 3 has the ability to rotate. At the same time, the counterweight 27 is fixed to the end of the rotating rod. As the vertical circulating conveyor system 2 moves synchronously with the pallet 3, the counterweight 27 pulls the rotating rod 26 and the pallet 3 to rotate adaptively, keeping the pallet 3 in a stable state with the groove facing upward, thus preventing the pallet 3 from tilting excessively and causing the sand core to fall off. Example 3

[0030] Please see Figure 5 In conjunction with the foregoing embodiments, this embodiment will explain and describe the vertical circulating conveyor system 2 as follows: The heat supply system 4 includes an inlet pipe 41, a shelf 42, and a blower nozzle 44. Two shelves 42 are fixed at the top of the drying chamber 1, forming a cavity 43 between the two shelves 42. Blower nozzles 44, which are all connected to the cavity 43, are evenly distributed on the lower shelf 42. The inlet pipe 41 is fixed at the top of the drying chamber 1. Its top end is connected to the hot air blower through a pipe, and its bottom end passes through the top of the drying chamber 1 and the upper shelf 42 and is connected to the cavity 43. The hot air blower adopts existing technology. Its specific structure and working principle will not be described in detail and are not shown in the figure.

[0031] The hot air blower supplies heat to the inlet pipe 41 through the pipe, and then the heat flows from the inlet pipe 41 into the cavity 43 between the two plates 42. Finally, it is blown out downward through the evenly distributed nozzles 44, thus forming multiple streams of hot air for drying.

[0032] In addition, heating elements 45 are evenly distributed in the cavity 43. When the heat loss in the drying oven 1 is severe, the heating elements 45 work to generate heat and provide auxiliary heating before being sprayed out from the nozzle 44 to compensate for the excessive heat loss. The heating elements 45 can be components such as electric heating tubes or electric heating grids. In this application, the heating element 45 is preferably an electric heating tube. Example 4

[0033] Please see Figure 1 , Figure 2 and Figure 6 This embodiment makes the following improvements based on the aforementioned embodiments: A pushing mechanism 5 is provided on one side of the bottom of the drying chamber 1, which is used to push the tray 3 to tilt to the side of the upper feed port 11 or the lower feed port 12 respectively, so as to facilitate loading and unloading. Specifically, the pushing mechanism 5 includes a power guide rail 51, a telescopic rod 53 and a U-shaped pusher 54. The power guide rail 51 is fixed to one side of the bottom of the drying chamber 1. The telescopic rod 53 is vertically fixed to the top of the movable seat 52 on the power guide rail 51. The U-shaped pusher 54 is fixed to the telescopic end of the top of the telescopic rod 53 and cooperates with the counterweight block 27 that moves to the bottom on the corresponding side.

[0034] When the tray 3, on which the sand core has been dried, reaches the bottom, the vertical circulating conveyor system 2 stops operating, maintaining the tray 3 between the loading port 11 and the unloading port 12. At this time, the power guide rail 51 drives the moving seat 52, the telescopic rod 53 and the U-shaped pusher 54 to move directly below the counterweight 27. Subsequently, the telescopic rod 53 extends and pushes the U-shaped pusher 54 upward, so that the vertical parts on both sides of the U-shaped pusher 54 are arranged on both sides of the counterweight 27 on one side. Next, the moving seat 52 is driven by the power guide rail 51 to move to the side of the upper material port 11. The vertical part of the U-shaped pusher 54 near the lower material port 12 pushes the counterweight 27, causing the counterweight 27 to swing to the side of the upper material port 11. Then, under the connection of the rotating rod 26, the tray 3 is driven to swing in the opposite direction, which increases the distance between the end of the tray 3 near the lower material port 12 and the upper tray 3, making it easier to unload. Subsequently, the moving seat 52 is driven by the power guide rail 51 to move to the side of the lower feed port 12 until the vertical part of the U-shaped pusher 54 near the upper feed port 11 pushes the counterweight block 27 to swing towards the lower feed port 12. Similarly, this can increase the distance between the end of the pallet 3 near the upper feed port 11 and the upper pallet 3, making it easier to load materials.

[0035] After the sand core is loaded, unloaded and replaced, the moving seat 52 is driven by the power guide rail 51 to move to the middle position for reset. At the same time, the telescopic rod 53 retracts to the limit position, driving the U-shaped pusher 54 to move down synchronously. In addition, the U-shaped pusher 54 is lower than the counterweight 27 at the bottom, so it will not obstruct or interfere with the subsequent movement of the counterweight 27.

[0036] Furthermore, during the above process, since the power guide rail 51 drives the moving seat 52 to move slowly, when the counterweight 27 separates from the U-shaped pusher 54, the counterweight 27 will not cause excessive swaying of the tray 3 due to inertia. Example 5

[0037] Please see Figure 2 The difference between this embodiment and embodiment 4 is that: Both sides of the drying chamber 1 are fixed with downward-facing suction hoods 6 located above the feed inlet 11 and the discharge inlet 12. The top of each suction hood 6 is connected to a suction pipe 61, and the ends of each suction pipe 61 are connected to a thermal exhaust gas treatment system. The thermal exhaust gas treatment system uses existing technology, and its specific structure and working principle will not be described in detail and are not shown in the figure.

[0038] The hot exhaust gas treatment system generates a negative pressure suction effect, which draws the hot flow from the feed port 11 and the discharge port 12 into the suction hood 6, and then transports it to the subsequent treatment unit through the suction pipe 61, so as to treat the hot exhaust gas and avoid direct discharge that would cause pollution.

[0039] In addition, in this application, the heat supply system 4, which serves as the heat source, is located at the top of the drying chamber 1. The heat supply system 4 forms multiple downward-flowing heat streams, ensuring that the drying heat can cover all locations of the sand core. Furthermore, the heat flow is from top to bottom, and its heat gradually decreases with loss. The loading and unloading areas are located at the bottom of the drying chamber 1. On the conveying path of the vertical circulating conveyor system 2, a low-temperature zone, a high-temperature zone, and a low-temperature zone are formed sequentially. The sand core is dried along the path of the above-mentioned temperature gradient. The initial low-temperature preheating allows the moisture inside the sand core to slowly diffuse and evaporate, preventing the formation of a hard shell on the surface that blocks the channels and causes cracking. The intermediate high temperature, based on the previous preheating, can quickly dry the residual moisture and promote the curing and strengthening of the binder. Finally, it passes through the low-temperature zone to alleviate the temperature difference and thermal stress, prevent the sand core from deforming and cracking, and effectively improve the drying and forming quality of the sand core.

[0040] Secondly, by arranging the loading port 11 and unloading port 12 on opposite sides, compared with the traditional arrangement of loading and unloading areas on the same side, the dried sand cores and undried sand cores can be placed separately to avoid confusion and ensure that the loading and unloading conveyor lines do not interfere with each other. At the same time, it also alleviates the pressure of material accumulation in the same loading and unloading area.

[0041] In addition, the corresponding components in this application all have high temperature resistance properties to avoid damage from heat.

[0042] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A vertical sand core drying device, comprising a drying chamber (1) and a tray (3), wherein the drying chamber (1) is provided with a feed inlet (11) and a discharge inlet (12) on both sides of its bottom, characterized in that: The drying box (1) is equipped with a vertical circulating conveyor system (2), and several trays (3) are evenly distributed on the vertical circulating conveyor system (2). The vertical circulating conveyor system (2) is used to reciprocate and circulate the trays (3) in the vertical direction. The drying chamber (1) is equipped with a heat supply system (4) at the top, which is used to form multiple downward flowing hot air streams inside the drying chamber (1) and above the vertical circulating conveying system (2) to dry the sand core placed on the tray (3); The drying box (1) is provided with a pushing mechanism (5) on one side of the bottom, which is used to push the tray (3) to tilt to the side of the upper feed port (11) or the lower feed port (12) respectively, so as to facilitate loading and unloading.

2. The vertical sand core drying equipment according to claim 1, characterized in that: The vertical circulating conveyor system (2) includes a shaft (21), a sprocket (22), a transmission chain (23), and a drive motor (24). The two shafts (21) are symmetrically rotated inside the drying chamber (1). The drive motor (24) is fixed on the outer wall of one side of the drying chamber (1), and the output shaft is fixedly connected to one end of one of the shafts (21). Both shafts (21) are fixedly fitted with sprockets (22) near their ends, and the two sprockets (22) on the same side are fitted with a transmission chain (23). The tray (3) is evenly distributed between the two transmission chains (23).

3. The vertical sand core drying equipment according to claim 2, characterized in that: Circular sleeves (25) are evenly distributed on each of the two transmission chains (23), and the circular sleeves (25) on the two transmission chains (23) correspond one to one; Each of the circular sleeves (25) is rotatably mounted with a rotating rod (26), and the tray (3) is fixed between the corresponding two rotating rods (26); Each of the aforementioned rotating rods (26) has a counterweight (27) fixed at its end.

4. The vertical sand core drying equipment according to claim 1, characterized in that: The heat supply system (4) includes an inlet pipe (41), a shelf (42), and a nozzle (44). Two shelves (42) are fixed at the top of the drying oven (1), and a cavity (43) is formed between the two shelves (42). The lower layer (42) is evenly distributed with spray nozzles (44) that are all connected to the clamping cavity (43). The inlet pipe (41) is fixed to the top of the drying box (1), with its top end connected to the hot air blower through a pipe, and its bottom end passing through the top of the drying box (1) and the upper shelf (42) and connected to the clamping cavity (43).

5. A vertical sand core drying device according to claim 4, characterized in that: Heating elements (45) are evenly distributed in the clamping cavity (43); The heating element (45) is an electric heating tube.

6. A vertical sand core drying device according to claim 3, characterized in that: The pushing mechanism (5) includes a power guide rail (51), a telescopic rod (53), and a U-shaped pusher (54). The power guide rail (51) is fixed to one side of the bottom inside the drying box (1), and the telescopic rod (53) is vertically fixed to the top of the movable seat (52) on the power guide rail (51); The U-shaped pusher (54) is fixed to the telescopic end at the top of the telescopic rod (53) and engages with the counterweight (27) that moves to the bottom on the corresponding side.

7. A vertical sand core drying device according to claim 6, characterized in that: When the telescopic rod (53) is retracted to its limit position, the U-shaped pusher (54) is lower than the counterweight (27) that has moved to its lowest position.

8. A vertical sand core drying device according to claim 1, characterized in that: The drying chamber (1) is equipped with downward-facing suction hoods (6) on both sides above the feed inlet (11) and the discharge inlet (12). Both of the suction hoods (6) have suction pipes (61) connected to their tops, and the ends of both suction pipes (61) are connected to the thermal exhaust gas treatment system.

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