Vacuum evanescent mode sand box bottom leakage device

Abstract

The utility model relates to the technical field of evanescent mode casting, in particular to a vacuum evanescent mode sand box bottom leakage device which comprises a sand box, a bottom leakage assembly is arranged at the bottom of the sand box and comprises a discharging inclined pipe communicated with the sand box, an auger is arranged in the discharging inclined pipe, an end plate is arranged at the right end of the discharging inclined pipe, and a motor used for driving the auger to rotate is arranged on the right side of the end plate. A discharging hole is formed in the position, close to the right end, of the bottom of the outer wall of the discharging inclined pipe, a sleeve is slidably connected to the outer wall of the discharging inclined pipe, and a rubber sealing gasket adheres to the inner wall of the sleeve. According to the vacuum evanescent mode sand box bottom leakage device, the packing auger is arranged in the unloading inclined pipe, the packing auger is driven by the motor to rotate, molding sand is efficiently conveyed to the unloading hole from the bottom of the sand box through the spiral blade in cooperation with an inclined guide structure of the unloading inclined pipe, and the rapid sand discharging function can be achieved; by means of the structure, the phenomena of accumulation and blockage of molding sand in the sand discharging process are avoided, and the problem that a sand discharging opening of an existing bottom leakage device is prone to blockage is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lost foam casting technology, in particular to a vacuum lost foam sand box bottom leakage device. BACKGROUND

[0002] The vacuum lost foam sand box is a key auxiliary equipment specially used for the lost foam casting process. In the lost foam casting process, the model made of foaming material is embedded in the sand box, and the dry sand without binder is covered, and the sand is tightly compacted under the condition of vacuum, so that a high-precision mold is formed. Subsequently, when the metal liquid is poured, the foaming model will be vaporized and disappeared due to high temperature, and the metal liquid will fill the position, and finally the required casting shape is formed. The vacuum lost foam sand box provides a controlled vacuum sealed environment to ensure the compactness of the sand and the integrity of the model, and its performance directly affects the quality and production efficiency of the casting.

[0003] In order to meet the needs of casting process, the vacuum lost foam sand box is usually provided with a special bottom leakage device at the bottom. The main function of the bottom leakage device is to control the discharge of sand or slag, and after the casting is completed, the sand in the sand box is quickly emptied by opening the bottom leakage device, which provides convenience for the subsequent production link. An efficient bottom leakage device not only can significantly shorten the sand discharge time, but also can reduce manual operation and improve the automation level of the casting production line. Therefore, the bottom leakage device occupies an important position in the overall structure of the vacuum lost foam sand box, and is an indispensable part of realizing efficient casting.

[0004] However, the existing vacuum lost foam sand box bottom leakage device has exposed some problems in actual use which need to be solved. For example, the sealing performance of part of the bottom leakage device is poor, which cannot effectively prevent air leakage under vacuum state, resulting in insufficient compactness of the sand, and then affecting the casting quality; at the same time, due to the uneven particle size of the sand, the sand discharge port is easy to be blocked, which affects the sand discharge efficiency; in addition, the sand discharge speed of some bottom leakage devices is slow, especially in the large batch casting scene, the problem of poor sand discharge will significantly reduce the production efficiency, therefore, we propose the vacuum lost foam sand box bottom leakage device. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a vacuum lost foam sand box bottom leakage device to solve the problems in the background art.

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0007] The application discloses a bottom leakage device for a vacuum lost foam sand box, which comprises a sand box used for containing molding sand and a foaming model, a plastic film is covered on the top of the sand box and the top of the sand box is sealed, so that a closed environment is provided to form a vacuum condition, the compactness of the molding sand and the stability of the casting process are ensured, a pipeline for vacuumizing is arranged on the outer wall of the sand box, a bottom leakage assembly is arranged at the bottom of the sand box and is used for controlling the discharge of the molding sand or slag and ensuring that the molding sand can be efficiently cleaned after the casting is completed, thereby providing convenience for the subsequent production links.

[0008] The bottom leakage assembly comprises a discharge chute in communication with the sand box, the discharge chute is used for smoothly guiding the molding sand from the sand box to a discharge port and avoiding the accumulation or blockage of the molding sand, a screw conveyor is arranged in the discharge chute, a right end of the discharge chute is provided with an end plate, a right side of the end plate is provided with a motor used for driving the screw conveyor to rotate, an output shaft of the motor is coaxially connected with a rotating shaft of the screw conveyor, the motor provides power to drive the screw conveyor to rotate, the molding sand can be efficiently transported and the blockage is avoided, the molding sand can be smoothly discharged, the motor is externally connected with a power supply and a controller, a discharge hole is formed in the bottom of the outer wall of the discharge chute and close to the right end, the discharge hole is used for the final discharge of the molding sand or slag, a sleeve is slidably connected to the outer wall of the discharge chute, the sleeve can slide through a motorized telescopic rod and is used for controlling the opening and closing of the discharge hole, an inner wall of the sleeve is bonded with a rubber sealing gasket, the inner wall of the rubber sealing gasket is tightly attached to the outer wall of the discharge chute, when the movable rod of the motorized telescopic rod is completely extended, the rubber sealing gasket seals the discharge hole together with the sleeve, the sand box is not gas-leaked under the vacuum state, and the stability of the vacuum environment in the casting process is ensured.

[0009] The outer wall of the discharge chute is provided with two first fixing protrusions which are symmetrically arranged in front and back, the right sides of the two first fixing protrusions are provided with motorized telescopic rods, the motorized telescopic rods are externally connected with a power supply and a controller, the outer wall of the sleeve and close to the right side is provided with two first connecting protrusions which are symmetrically arranged in front and back, the movable rods of the two motorized telescopic rods are fixedly connected to the left sides of the two first connecting protrusions respectively, the first connecting protrusions are used for being fixedly connected with the motorized telescopic rods, so as to transmit the displacement of the motorized telescopic rods and push the sleeve to slide.

[0010] Preferably, the bottom of the sand box and close to the four corners are provided with supports, the supports are used for supporting the sand box and improving the stability of the sand box, the bottom of the support is provided with a plurality of preset threaded holes for mounting rollers, the preset threaded holes are used for mounting the rollers and facilitating the movement and positioning of the sand box.

[0011] Preferably, the bottom of the sand box inner wall is provided with a bottom plate for carrying the sand in the sand box and providing a channel for the sand discharge, the top of the bottom plate is provided with a material guide groove for concentrating and guiding the sand to the discharge port, the bottom end of the material guide groove is provided with a discharge port, and the discharge port is communicated with the discharge inclined pipe for guiding the sand in the sand box into the discharge inclined pipe.

[0012] Preferably, the right end of the outer wall of the discharge inclined pipe is provided with an annular mounting plate, and the annular mounting plate is detachably connected with the end plate through bolts, so as to facilitate the installation and dismounting of the end plate.

[0013] Preferably, the right side of the end plate is provided with a protective cover for protecting the motor and the safety of the operator, the motor is located in the protective cover, and the bottom of the protective cover is provided with a plurality of heat dissipation holes for heat dissipation of the motor to prevent the motor from being damaged due to overheating caused by too long running time.

[0014] Preferably, the outer wall of the discharge inclined pipe and the position close to the right side of the discharge hole are provided with an annular baffle, the annular baffle is used for limiting the sliding range of the sleeve and providing a positioning function, and the left side of the annular baffle is provided with an annular positioning groove, when the movable rod of the electric telescopic rod is fully extended, the right side of the sleeve is inserted into the annular positioning groove, and the stability of the sleeve is further enhanced.

[0015] Preferably, the bottom of the outer wall of the discharge inclined pipe is provided with a second fixing protrusion, the right side of the second fixing protrusion is provided with a circular fixing pipe, the bottom of the sleeve and the position close to the right side are provided with a second connecting protrusion, the left side of the second connecting protrusion is provided with a positioning rod, and the positioning rod is slidingly connected into the circular fixing pipe to provide guidance and support for the stable sliding of the sleeve.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The vacuum lost foam sand box bottom leakage device, by slidingly connecting the sleeve on the outer wall of the discharge inclined pipe, and bonding the rubber sealing gasket on the inner wall of the sleeve, the discharge hole is sealed when the electric telescopic rod pushes the sleeve to slide, and good sealing effect is achieved, the rubber sealing gasket is closely attached to the outer wall of the discharge inclined pipe, air leakage phenomenon of the sand box in the vacuum state is avoided, the stability of the vacuum environment in the casting process is maintained, and the problem of poor sealing performance of the existing bottom leakage device is solved.

[0018] 2. The vacuum lost foam sand box bottom drain device has an auger inside the discharge inclined tube. The auger is driven by a motor to rotate. In conjunction with the inclined guide structure of the discharge inclined tube, the spiral blades efficiently transport the molding sand from the bottom of the sand box to the discharge hole, which can realize the function of rapid sand discharge. This structure avoids the accumulation and blockage of molding sand during the sand discharge process, solves the problem of sand discharge port blockage that is easy to occur in existing bottom drain devices, and greatly improves the adaptability of the device in high-frequency and large-volume casting operation scenarios.

[0019] 3. The vacuum lost foam sand box bottom discharge device, by setting a bottom plate at the bottom of the inner wall of the sand box, opening a guide trough at the top of the bottom plate, and setting a discharge port at the bottom of the guide trough, realizes the function of the molding sand flowing from the sand box to the discharge inclined pipe. The molding sand discharge process is smoother, avoiding the accumulation of molding sand at the bottom, and further improving the overall sand discharge efficiency of the device.

[0020] 4. The vacuum lost foam sand box bottom leakage device uses an electric telescopic rod to control the sliding of the sleeve, allowing users to flexibly control the opening and closing of the discharge hole for easy unloading operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the overall structure of this utility model in use.

[0023] Figure 3 This is a partial structural schematic diagram of the present invention;

[0024] Figure 4 This is a cross-sectional structural diagram of the sand box and the base plate in this utility model;

[0025] Figure 5 This is a schematic diagram of the bottom leakage component structure in this utility model;

[0026] Figure 6 This is one of the partial structural schematic diagrams of the bottom leakage component in this utility model;

[0027] Figure 7 This is the second partial structural schematic diagram of the bottom leakage component in this utility model;

[0028] In the diagram: 1. Sand box; 2. Bottom drain assembly; 20. Unloading inclined pipe; 200. Unloading hole; 201. Annular mounting plate; 202. First fixing protrusion; 203. Second fixing protrusion; 21. Screw; 22. End plate; 23. Motor; 24. Protective cover; 240. Heat dissipation hole; 25. Sleeve; 250. First connecting protrusion; 251. Second connecting protrusion; 252. Positioning rod; 26. Electric telescopic rod; 27. Rubber sealing gasket; 28. Annular baffle; 280. Annular positioning groove; 29. ​​Circular fixing pipe; 3. Base plate; 30. Guide chute; 31. Discharge port; 4. Bracket; 40. Pre-set threaded hole. Detailed Implementation

[0029] 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.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Please see Figures 1-7 This utility model provides a technical solution:

[0032] The vacuum lost foam casting sand box bottom leakage device includes a sand box 1, which is used to contain molding sand and foamed mold. By covering the top of the sand box 1 with a plastic film and sealing the top of the sand box 1, a closed environment can be provided to form vacuum conditions, ensuring the compactness of the molding sand and the stability of the casting process. The outer wall of the sand box 1 is provided with a vacuum pipe, and the bottom of the sand box 1 is provided with a bottom leakage component 2, which is used to control the discharge of molding sand or slag, ensuring that the molding sand can be efficiently cleaned after casting, providing convenience for subsequent production stages.

[0033] The bottom drain assembly 2 includes a discharge inclined pipe 20 connected to the sand box 1. The discharge inclined pipe 20 is used to smoothly guide molding sand from the sand box 1 to the discharge outlet, avoiding sand accumulation or blockage. An auger 21 is installed inside the discharge inclined pipe 20. An end plate 22 is provided at the right end of the discharge inclined pipe 20. A motor 23 for driving the auger 21 is located on the right side of the end plate 22. The output shaft of the motor 23 is coaxially connected to the rotating shaft of the auger 21. The motor 23 provides power to drive the auger 21 to rotate, which can efficiently transport molding sand and avoid blockage, ensuring that the molding sand can be discharged smoothly. The motor 23 is connected to an external power supply and controller. The bottom of the outer wall of the discharge inclined pipe 20 is close to... A discharge hole 200 is provided at the right end. The discharge hole 200 is used for the final discharge of molding sand or slag. A sleeve 25 is slidably connected to the outer wall of the discharge inclined tube 20. The sleeve 25 can slide through the electric telescopic rod 26 and is used to control the opening and closing of the discharge hole 200. A rubber sealing gasket 27 is bonded to the inner wall of the sleeve 25. The inner wall of the rubber sealing gasket 27 is tightly fitted to the outer wall of the discharge inclined tube 20. When the movable rod of the electric telescopic rod 26 is fully extended, the rubber sealing gasket 27 cooperates with the sleeve 25 to seal the discharge hole 200, ensuring that the sand box 1 does not leak air under vacuum, thereby ensuring the stability of the vacuum environment during the casting process.

[0034] The outer wall of the unloading inclined tube 20 is provided with two first fixing protrusions 202 arranged symmetrically front to back. Each of the two first fixing protrusions 202 is provided with an electric telescopic rod 26 on its right side. The electric telescopic rod 26 is connected to an external power supply and controller. The outer wall of the sleeve 25 and near the right side are provided with two first connecting protrusions 250 arranged symmetrically front to back. The movable rods of the two electric telescopic rods 26 are respectively fixedly connected to the left side of the two first connecting protrusions 250. The first connecting protrusions 250 are used to fixally connect with the electric telescopic rods 26, thereby transmitting the displacement of the electric telescopic rods 26 and pushing the sleeve 25 to slide.

[0035] In this embodiment, a bracket 4 is provided at the bottom of the sand box 1 and near the four corners. The bracket 4 is used to support the sand box 1 and improve the overall stability. The bottom of the bracket 4 is provided with multiple pre-set threaded holes 40 for installing rollers. The pre-set threaded holes 40 are used to install rollers, which facilitates the movement and positioning of the sand box 1.

[0036] Specifically, the bottom of the inner wall of the sand box 1 is provided with a bottom plate 3. The bottom plate 3 is used to support the molding sand in the sand box 1 and to provide a channel for the discharge of the molding sand. The top of the bottom plate 3 is provided with a guide trough 30. The guide trough 30 is used to concentrate and guide the molding sand to the discharge port 31. The bottom end of the guide trough 30 is provided with a discharge port 31. The discharge port 31 is connected to the unloading inclined pipe 20 and is used to guide the molding sand in the sand box 1 into the unloading inclined pipe 20.

[0037] Furthermore, an annular mounting plate 201 is provided at the right end of the outer wall of the unloading inclined pipe 20. The annular mounting plate 201 is detachably connected to the end plate 22 by bolts, which facilitates the installation and removal of the end plate 22.

[0038] Furthermore, a protective cover 24 is provided on the right side of the end plate 22 to protect the motor 23 and the safety of the operator. The motor 23 is located inside the protective cover 24. Multiple heat dissipation holes 240 are provided at the bottom of the protective cover 24. The heat dissipation holes 240 are used to dissipate heat from the motor 23 and prevent the motor 23 from overheating and being damaged due to prolonged operation.

[0039] Furthermore, an annular baffle 28 is provided on the outer wall of the unloading inclined tube 20 near the right side of the unloading hole 200. The annular baffle 28 is used to limit the sliding range of the sleeve 25 and provide a positioning function. An annular positioning groove 280 is provided on the left side of the annular baffle 28. When the movable rod of the electric telescopic rod 26 is fully extended, the right side of the sleeve 25 is inserted into the annular positioning groove 280, further enhancing the stability of the sleeve 25.

[0040] Furthermore, a second fixing protrusion 203 is provided at the bottom of the outer wall of the unloading inclined tube 20, and a circular fixing tube 29 is provided on the right side of the second fixing protrusion 203. A second connecting protrusion 251 is provided at the bottom of the sleeve 25 and near the right side. A positioning rod 252 is provided on the left side of the second connecting protrusion 251. The positioning rod 252 is slidably connected inside the circular fixing tube 29 to provide guidance and support for the smooth sliding of the sleeve 25.

[0041] In this embodiment, the vacuum lost foam casting sand box bottom leakage device involves filling the sand box 1 with molding sand and simultaneously embedding a model made of foamed material into the sand box 1, ensuring that the molding sand covers the model and fills it densely. A plastic film is then placed over the top of the sand box 1 to seal it, ensuring that the sand box 1 provides a sealed environment to create a vacuum. Next, a vacuum pipe on the outer wall of the sand box 1 is connected to a vacuum system. The vacuum system then evacuates the sand box 1, causing the molding sand to be tightly compacted under vacuum. Subsequently, the casting operation is completed within the sand box 1, i.e., the foamed material model is vaporized and disappears by pouring high-temperature molten metal, allowing the molten metal to fill its position. The required casting is formed. After casting is completed, the vacuum system is turned off, and the electric telescopic rod 26 is started by the controller. The movable rod of the electric telescopic rod 26 retracts, driving the sleeve 25 to slide and open the discharge hole 200. Then, the motor 23 is started by the controller to drive the auger 21 to rotate, conveying the molding sand through the discharge inclined pipe 20 to the discharge hole 200, thus efficiently discharging the molding sand. After the sand is discharged, the motor 23 is turned off, the rotation of the auger 21 is stopped, and the movable rod of the electric telescopic rod 26 is extended to push the sleeve 25 back to its original position, so that the rubber sealing gasket 27 is tightly fitted with the outer wall of the discharge inclined pipe 20, thus sealing the discharge hole 200.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. Vacuum lost foam sand box bottom leakage device, comprising a sand box (1), characterized in that: The bottom of the sand box (1) is provided with a bottom leakage assembly (2), the bottom leakage assembly (2) comprises a discharge inclined pipe (20) communicated with the sand box (1), a screw conveyor (21) is arranged in the discharge inclined pipe (20), the right end of the discharge inclined pipe (20) is provided with an end plate (22), the right side of the end plate (22) is provided with a motor (23) for driving the screw conveyor (21) to rotate, the bottom of the outer wall of the discharge inclined pipe (20) and the position close to the right end are provided with a discharge hole (200), the outer wall of the discharge inclined pipe (20) is slidably connected with a sleeve (25), the inner wall of the sleeve (25) is bonded with a rubber sealing gasket (27), the outer wall of the discharge inclined pipe (20) is provided with two first fixed lugs (202) arranged in front and back symmetry, the right side of the two first fixed lugs (202) is provided with an electric telescopic rod (26), the outer wall of the sleeve (25) and the position close to the right side are provided with two first connecting lugs (250) arranged in front and back symmetry, and the movable rods of the two electric telescopic rods (26) are fixedly connected to the left sides of the two first connecting lugs (250) respectively.

2. The vacuum lost foam mold sand box bottom leak device of claim 1, wherein: The bottom of the sand box (1) and the positions close to the four corners are provided with supports (4), and a plurality of preset threaded holes (40) for mounting rollers are formed in the bottom of the support (4).

3. The vacuum lost foam mold sand box bottom leakage apparatus of claim 1, wherein: The bottom of the inner wall of the sand box (1) is provided with a bottom plate (3), the top of the bottom plate (3) is provided with a material guide groove (30), and the bottom end of the material guide groove (30) is provided with a discharge port (31); the discharge port (31) is communicated with the discharge inclined pipe (20).

4. The vacuum lost foam mold sand box bottom leakage apparatus of claim 1, wherein: The right end of the outer wall of the discharge inclined pipe (20) is provided with an annular mounting plate (201), and the annular mounting plate (201) is detachably connected with the end plate (22) through bolts.

5. The vacuum lost foam mold sand box bottom leakage apparatus of claim 1, wherein: The right side of the end plate (22) is provided with a protective cover (24), the motor (23) is located in the protective cover (24), and a plurality of heat dissipation holes (240) are formed in the bottom of the protective cover (24).

6. The vacuum lost foam mold sand box bottom leakage apparatus of claim 1, wherein: The outer wall of the discharge inclined pipe (20) and the position close to the right side of the discharge hole (200) are provided with an annular baffle (28), the left side of the annular baffle (28) is provided with an annular positioning groove (280), and when the movable rod of the electric telescopic rod (26) is completely stretched out, the right side of the sleeve (25) is inserted into the annular positioning groove (280).

7. The vacuum lost foam mold sand box bottom leakage apparatus of claim 1, wherein: The bottom of the outer wall of the discharge inclined pipe (20) is provided with a second fixed lug (203), the right side of the second fixed lug (203) is provided with a circular fixing pipe (29), the bottom of the sleeve (25) and the position close to the right side are provided with a second connecting lug (251), the left side of the second connecting lug (251) is provided with a positioning rod (252), and the positioning rod (252) is slidably connected into the circular fixing pipe (29).

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