Molding sand feeding device for micro-droplet jet molding equipment

Abstract

The utility model relates to a molding sand feeding device for droplet jet molding equipment. According to the molding sand feeding device for the droplet jet molding equipment, the interior of a vacuum feeding barrel and the position of a feeding opening are processed into a vacuum environment through a vacuum source, molding sand is conveniently sucked and conveyed into the vacuum feeding barrel, the molding sand falls into a conveying barrel through a discharging opening under the action of the gravity of the molding sand, and a driving mechanism drives a rotating shaft to drive a spiral blade to rotate; molding sand in the conveying cylinder is conveyed to the discharging station from the feeding station, the molding sand at the discharging station enters the quantitative sand discharging device through the discharging port and the sand guiding pipe under the action of the gravity of the molding sand, and therefore the spiral conveying assembly and the vacuum feeding assembly are matched with each other; the connection position between the molding sand feeding device and the quantitative sand discharging device for the micro-droplet jet molding equipment does not blow back and overflow sand due to the negative pressure characteristic, the phenomenon that the molding sand overflows due to negative pressure blowback caused by direct vacuum feeding is effectively avoided, and the probability that a movement module is damaged due to serious sand accumulation is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of sand mold 3D printing equipment, and in particular to a molding sand feeding device for microdroplet jet molding equipment. Background Technology

[0002] During the operation of microdroplet jet molding equipment, the traditional sand mixing system often uses a vacuum feeder and a blower to power the sand from the outlet of the bottom pipe of the sand hopper into the quantitative sand feeding device of the sand spreading system below the sand feeding device. Due to the negative pressure back-blowing characteristics, this feeding method causes sand to accumulate and overflow at the connection between the quantitative sand feeding device and the sand feeding device. At the same time, it is difficult to manually observe the accumulation at the connection between the quantitative sand feeding device and the sand feeding device, which is not conducive to safe operation. Manually cleaning the overflowing sand is time-consuming, and it is impossible to manually clean the overflowing sand during printing. Long-term printing may damage the motion module due to severe sand accumulation. Utility Model Content

[0003] Therefore, it is necessary to provide a sand feeding device for microdroplet jet molding equipment that can solve the problems of uneven sand feeding and sand backflushing overflow in the sand mixing system during the operation of microdroplet jet molding equipment, realize the automation of sand feeding in microdroplet jet molding equipment, and avoid the phenomenon of sand overflow caused by negative pressure backflushing in direct vacuum feeding.

[0004] A molding sand feeding device for a microdroplet jet molding equipment, comprising:

[0005] The frame has spaced loading and unloading stations;

[0006] A screw conveyor assembly includes a conveying cylinder, a rotating shaft, helical blades, and a sand guide pipe. The conveying cylinder is mounted on the frame and extends from the loading station to the unloading station. The conveying cylinder has an inlet and an outlet on its side walls at the loading and unloading stations, respectively. The inlet and outlet are located on opposite sides of the conveying cylinder. The rotating shaft is rotatably mounted inside the conveying cylinder and extends in the direction from the loading station to the unloading station. The helical blades are sleeved and fixed on the rotating shaft and located inside the conveying cylinder. The orthographic projection of the inlet in the diameter direction of the conveying cylinder is at least partially located on the helical blades. One end of the sand guide pipe is fixed to and communicates with the outlet, and the other end is used for a sealed connection to a quantitative sand feeding device.

[0007] A drive mechanism is connected to one end of the rotating shaft and is used to drive the rotating shaft to rotate;

[0008] A vacuum feeding assembly includes a vacuum feeding barrel and a vacuum source; the vacuum feeding barrel is a cylindrical structure with an open bottom; the bottom of the vacuum feeding barrel is installed at the feeding station of the frame, and the bottom opening of the vacuum feeding barrel is sealed and connected to the feed inlet; a feed port is formed on the side wall of the vacuum feeding barrel; the vacuum source is connected and disposed on the vacuum feeding barrel.

[0009] In one embodiment, the screw conveyor assembly further includes a support structure; the support structure includes a mounting plate, a support plate spaced apart from the mounting plate, a support member connected between the mounting plate and the support plate, and a feed hopper fixed to the side of the support plate facing the mounting plate;

[0010] The mounting plate is detachably mounted on the frame; the pallet has a through hole that is sealed and connected to the large end of the feed hopper; the end of the conveying cylinder with the feed inlet is installed between the pallet and the mounting plate, and the small end opening of the feed hopper is sealed and connected to the feed inlet; the vacuum feeding hopper is detachably mounted on the side of the pallet away from the feed hopper, and the bottom opening of the vacuum feeding hopper is connected to the through hole.

[0011] In one embodiment, a vibrator is also included; the vibrator is mounted on the side wall of the conveyor cylinder and located between the pallet and the mounting plate.

[0012] In one embodiment, there are multiple vibrators; all of the multiple vibrators are located between the pallet and the mounting plate, and are installed at intervals along the circumference of the conveying cylinder on the side wall of the conveying cylinder.

[0013] In one embodiment, the system further includes a first laser sensor and a controller; the first laser sensor is communicatively connected to the controller and is used to detect a first material level information at the bottom of the vacuum feeding barrel in real time and transmit the first material level information to the controller; the controller is electrically connected to the vacuum source and is used to control the opening and closing of the vacuum source based on the first material level information.

[0014] In one embodiment, a second laser sensor is further included; the second laser sensor is communicatively connected to the controller and is used to detect the second material level information of the conveying pipe at the outlet in real time and transmit the second material level information to the controller; the controller is also used to control the opening and closing of the drive mechanism and the vacuum source according to the second material level information.

[0015] In one embodiment, the end of the sand guide pipe away from the conveying cylinder is used to be sealed and connected to the sand feeding device via the sealing clamp.

[0016] In one embodiment, the vacuum feeding assembly further includes a filter element installed inside the vacuum feeding barrel; the inlet communicates with the space between the outer wall of the filter element and the inner wall of the vacuum feeding barrel; the bottom opening of the vacuum feeding barrel communicates with the space between the outer wall of the filter element and the inner wall of the vacuum feeding barrel; and the vacuum source communicates with the internal space of the filter element.

[0017] In one embodiment, the top of the vacuum feeding barrel is provided with an air inlet and outlet that communicate with the internal space of the filter element; the vacuum feeding assembly also includes a backflushing mechanism; the backflushing mechanism is installed on the top of the vacuum feeding barrel and communicates with the internal space of the filter element.

[0018] In one embodiment, the top of the vacuum feeding barrel is provided with an air inlet and outlet that communicate with the internal space of the filter element;

[0019] The backflush mechanism includes a backflush main unit, an air tank, a backflush solenoid valve, and a pressure regulating filter; the side wall of the air tank is respectively provided with a first backflush port communicating with the backflush main unit, a second backflush port communicating with the air inlet and outlet, and an air inlet communicating with the pressure regulating filter.

[0020] The aforementioned molding sand feeding device for micro-droplet jet molding equipment uses a vacuum source to create a vacuum environment inside the vacuum feeding barrel and at the inlet, facilitating the suction and transport of molding sand from the material box to the vacuum feeding barrel. Under its own gravity, the molding sand falls downward through the outlet into the conveying cylinder. Simultaneously, the drive mechanism is activated to drive the rotating shaft to rotate the spiral blades. The rotating spiral blades transport the molding sand from the feeding station to the unloading station. Under its own gravity, the molding sand at the unloading station enters the quantitative sand unloading device through the outlet and the sand guide pipe, thus completing the entire molding sand feeding process. Therefore, the above-mentioned sand feeding device for micro-droplet jet molding equipment can realize automated feeding. The screw conveyor component and the vacuum feeding component work together to ensure that the connection between the sand feeding device and the quantitative sand feeding device for micro-droplet jet molding equipment (i.e., the outlet of the conveying cylinder, the sand guide pipe, and the connection between the sand guide pipe and the quantitative sand feeding device) will not cause backflow of sand due to negative pressure characteristics. This effectively avoids the phenomenon of sand overflow caused by negative pressure backflow due to direct vacuum feeding and reduces the probability of damage to the motion module due to severe sand accumulation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the molding sand feeding device for the microdroplet jet molding equipment in a preferred embodiment of the present invention;

[0022] Figure 2 for Figure 1The diagram shown is a structural schematic of the frame in the molding sand feeding device for a microdroplet jet molding equipment.

[0023] Figure 3 for Figure 1 The diagram shown is a schematic diagram of the spiral feeding component in the molding sand feeding device for microdroplet jet molding equipment.

[0024] Figure 4 for Figure 1 The diagram shows the structure of the vacuum feeding component in the molding sand feeding device for microdroplet jet molding equipment.

[0025] Explanation of reference numerals in the detailed embodiments: 100, Shaping sand feeding device for micro-droplet jet molding equipment; 110, Frame; 111, Feeding station; 112, Discharging station; 120, Screw conveyor assembly; 121, Conveying cylinder; 122, Rotating shaft; 123, Spiral blade; 124, Sand guide pipe; 125, Support structure; 1251, Mounting plate; 1252, Support plate; 12521, Through hole; 1253, Support component; 1254. 126. Feed hopper; 130. Sealing clamp; 131. Drive mechanism; 132. Servo motor; 133. Worm gear reducer; 140. Vacuum feeding assembly; 141. Vacuum feeding barrel; 1411. Feed inlet; 143. Backflushing mechanism; 1431. Backflushing main unit; 1432. Air storage tank; 1433. Backflushing solenoid valve; 1434. Pressure regulating filter; 150. Vibrator; 160. First laser sensor; 170. Second laser sensor. Detailed Implementation

[0026] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it may be directly on the other element or there may be intermediate elements. It is also understood that when an element is referred to as being "between" two elements, it may be the only one between the two elements, or there may be one or more intermediate elements.

[0029] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0030] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0031] Please see Figure 1 The molding sand feeding device 100 for microdroplet jet molding equipment in a preferred embodiment of the present invention includes a frame 110, a screw conveyor assembly 120, a drive mechanism 130 and a vacuum feeding assembly 140.

[0032] Please refer to section 2 as well. The frame 110 has a loading station 111 and a unloading station 112 arranged at intervals. Specifically, the line connecting the loading station 111 and the unloading station 112 on the frame 110 is a straight line.

[0033] Please refer to the following: Figure 3 The screw conveyor assembly 120 includes a conveyor cylinder 121, a rotating shaft 122, a screw blade 123, and a sand guide pipe 124. The conveyor cylinder 121 is mounted on a frame 110 and extends from the loading station 111 to the unloading station 112. The side walls of the conveyor cylinder 121 at the loading station 111 and the unloading station 112 are respectively provided with an inlet (not shown) and an outlet (not labeled). The inlet and outlet are located on opposite sides of the conveyor cylinder 121. The rotating shaft 122 is rotatably mounted inside the conveyor cylinder 121 and extends in the direction from the loading station 111 to the unloading station 112. The screw blade 123 is sleeved and fixed on the rotating shaft 122 and located inside the conveyor cylinder 121. The orthographic projection of the inlet in the diameter direction of the conveyor cylinder 121 is at least partially located on the screw blade 123. One end of the sand guide pipe 124 is fixed at the discharge port and connected to the discharge port, while the other end is used to seal and connect to the quantitative sand feeding device.

[0034] When the molding sand feeding device 100 for the microdroplet jet molding equipment is located on a horizontal plane and in use, the inlet and outlet are located on the upper and lower sides of the conveying cylinder 121, respectively.

[0035] The drive mechanism 130 is connected to one end of the rotating shaft 122 and is used to drive the rotating shaft 122 to rotate. Specifically, the drive mechanism 130 includes a servo motor 131 and a worm gear reducer 132. The servo motor 131 is connected to the main shaft via the worm gear reducer 132. Of course, in other embodiments, the drive mechanism 130 may also include a drive motor and a gear transmission assembly, or the drive mechanism 130 may also include a drive motor and a belt transmission assembly, and so on.

[0036] Please refer to the following: Figure 4 The vacuum loading assembly 140 includes a vacuum loading barrel 141 and a vacuum source (not shown). The vacuum loading barrel 141 is a cylindrical structure with an open bottom. The bottom of the vacuum loading barrel 141 is installed at the loading station 111 of the frame 110, and the bottom opening of the vacuum loading barrel 141 is sealed and connected to the feed inlet. A feed inlet 1411 is formed on the side wall of the vacuum loading barrel 141. The vacuum source is connected and installed on the vacuum loading barrel 141. The vacuum source can be a vacuum pump, a blower, or any equipment that can create a vacuum environment inside the vacuum loading barrel 141.

[0037] The above-mentioned molding sand feeding device 100 for micro-droplet jet molding equipment, when in use, uses a vacuum source to create a vacuum environment inside the vacuum feeding barrel 141 and at the inlet, so as to facilitate the suction and transportation of molding sand in the material box into the vacuum feeding barrel 141. At this time, the molding sand will fall downward through the outlet into the conveying cylinder 121 under its own gravity. At the same time, the drive mechanism 130 is started to drive the rotating shaft 122 to drive the spiral blade 123 to rotate. The rotating spiral blade 123 is used to transport the molding sand in the conveying cylinder 121 from the feeding station 111 to the unloading station 112. The molding sand at the unloading station 112 will enter the quantitative sand unloading device through the outlet and the sand guide pipe 124 under its own gravity, thus realizing the entire feeding operation of molding sand. Therefore, the above-mentioned sand feeding device for micro-droplet jet molding equipment can realize automated feeding, and the setting of the screw conveyor component 120 ensures that the connection between the sand feeding device 100 and the quantitative sand feeding device (i.e. the outlet of the conveying cylinder 121, the sand guide pipe 124, and the connection between the sand guide pipe 124 and the quantitative sand feeding device) will not backflush due to negative pressure characteristics, effectively avoiding the phenomenon of sand overflow caused by negative pressure backflush due to direct vacuum feeding, and reducing the probability of damage to the motion module due to severe sand accumulation.

[0038] In some embodiments, the screw conveyor assembly 120 further includes a support structure 125. The support structure 125 includes a mounting plate 1251, a support plate 1252 spaced apart from the mounting plate 1251, a support member 1253 connected between the mounting plate 1251 and the support plate 1252, and a feed hopper 1254 fixed to the side of the support plate 1252 facing the mounting plate 1251.

[0039] Mounting plate 1251 is detachably mounted on frame 110. A through hole 12521 is provided on pallet 1252, sealingly communicating with the large end of feed hopper 1254. One end of conveyor cylinder 121 with a feed inlet is installed between pallet 1252 and mounting plate 1251, sealingly connecting the small end opening of feed hopper 1254 with the feed inlet. Vacuum loading hopper 141 is detachably mounted on the side of pallet 1252 opposite to feed hopper 1254, with its bottom opening communicating with through hole 12521.

[0040] Thus, the mounting structure 125 facilitates the installation and disassembly of the vacuum feeding hopper 141 and the screw rotation assembly, and ensures greater structural stability of the vacuum feeding hopper 141. The pallet 1252 and feed hopper 1254 ensure that the sand in the vacuum feeding hopper 141 can smoothly fall into the conveying cylinder 121 through the feed inlet under its own gravity, reducing the probability of material jamming or stagnation during this process.

[0041] Furthermore, in some embodiments, the molding sand feeding device 100 for the microdroplet jet molding equipment also includes a vibrator 150. The vibrator 150 is installed on the side wall of the conveying cylinder 121 and is located between the support plate 1252 and the mounting plate 1251. In actual use, when sand sticks to the bottom opening of the vacuum feeding hopper 141, the feed hopper 1254, and the feed inlet, the vibrator 150 is activated. Since the feed hopper 1254 and the conveying cylinder 121, as well as the feed hopper 1254 and the vacuum feeding hopper 141, are rigidly connected, the vibrator 150 will cause different degrees of vibration to the bottom of the conveying cylinder 121, the feed hopper 1254, and the vacuum feeding hopper 141 when it is working, so as to clean the sticky sand and reduce the probability of sand accumulation at the feeding station 111.

[0042] Furthermore, in this embodiment, there are multiple vibrators 150. The multiple vibrators 150 are located between the support plate 1252 and the mounting plate 1251, and are installed at intervals along the circumference of the conveying cylinder 121 on its side wall. Specifically, there are two vibrators 150, which are respectively installed on opposite sides of the conveying cylinder 121. Of course, in other embodiments, the number of vibrators 150 can be other than two, such as three. The arrangement of multiple vibrators 150 allows for uniform vibration of the conveying cylinder 121 from different directions when sand adheres to the bottom opening of the vacuum loading hopper 141, the feed hopper 1254, and the feed inlet. The vibration force is large, and it can clean the adhered sand from all directions, while also improving the cleaning effect.

[0043] Furthermore, in some embodiments, the molding sand feeding device 100 for the microdroplet jet molding equipment also includes a first laser sensor 160 and a controller (not shown). The first laser sensor 160 is communicatively connected to the controller and is used to detect the first material level information at the bottom of the vacuum feeding barrel 141 in real time and transmit the first material level information to the controller. The controller is electrically connected to the vacuum source and is used to control the opening and closing of the vacuum source based on the first material level information.

[0044] Specifically, when the first material level information shows that the sand level at the bottom of the vacuum feeding barrel 141 is greater than or equal to the first preset material level, it indicates that sand has accumulated at the feeding station 111. At this time, the controller controls the vacuum source to stop working, so that the vacuum feeding component 140 no longer feeds sand into the conveying cylinder 121, in order to reduce the probability of sand accumulation becoming more serious or even blockage. At this time, the drive mechanism 130 continues to drive the rotating shaft 122 to drive the spiral blade 123 to work until the first material level information shows that the sand level at the bottom of the vacuum feeding barrel 141 is less than the first preset material level. Then, the controller controls the vacuum source to start, so as to ensure that the vacuum feeding component 140 continues to feed sand into the conveying cylinder 121.

[0045] Therefore, the above-mentioned first laser sensor 160 and controller can realize automatic monitoring and automatic cleaning of the sand level at the feeding station 111, eliminating the need for manual sand cleaning and avoiding damage to the motion module due to sand accumulation.

[0046] Furthermore, in some embodiments, the molding sand feeding device 100 for the microdroplet jet molding equipment also includes a second laser sensor 170. The second laser sensor 170 is communicatively connected to the controller and is used to detect the second material level information at the outlet of the conveying pipe in real time and transmit the second material level information to the controller. The controller is also used to control the opening and closing of the drive mechanism 130 and the vacuum source according to the second material level information.

[0047] Specifically, when the second material level information shows that the sand level at the outlet of the conveying pipe is greater than or equal to the second preset material level, it indicates that sand has accumulated at the connection between the molding sand feeding device 100 and the quantitative sand feeding device for the micro-droplet jet molding equipment. At this time, the controller simultaneously controls the drive mechanism 130 and the vacuum source to stop working, that is, to stop conveying sand to the feeding station 112, so as to give the sand at one end of the feeding station 112 in the conveying pipe enough time to fall into the quantitative sand feeding device under its own gravity, until the second sand information shows that the sand level at the outlet of the conveying pipe is less than the second preset material level. The controller then controls the vacuum source and the drive mechanism 130 to start, so as to continue the normal feeding of molding sand.

[0048] The first preset material level and the second preset material level can be the same or different. The setting of the second laser sensor 170 can realize the automatic monitoring and automatic cleaning of the sand level at the connection between the molding sand feeding device 100 and the quantitative sand feeding device for the micro-droplet jet molding equipment, eliminating the need for manual sand cleaning and further avoiding damage to the moving module due to sand accumulation.

[0049] In some embodiments, the end of the sand guide pipe 124 away from the conveying cylinder 121 is used to be sealed and connected to the sand feeding device via a sealing clamp 126. In this way, the sealing connection between the sand guide pipe 124 and the quantitative sand feeding device is achieved by the sealing clamp 126, which can further prevent sand from overflowing.

[0050] In some embodiments, the vacuum feeding assembly 140 further includes a filter element (not shown) installed within the vacuum feeding hopper 141. The inlet 1411 communicates with the space between the outer wall of the filter element and the inner wall of the vacuum feeding hopper 141. The bottom opening of the vacuum feeding hopper 141 communicates with the space between the outer wall of the filter element and the inner wall of the vacuum feeding hopper 141. The vacuum source communicates with the internal space of the filter element. The filter element not only prevents sand from entering the vacuum source during the process of being sucked into the vacuum feeding hopper 141, thus affecting the service life of the vacuum source, but also reduces sand loss during the molding sand feeding process and improves feeding reliability.

[0051] Furthermore, in some embodiments, the top of the vacuum feeding hopper 141 is provided with an inlet / outlet (not shown) communicating with the internal space of the filter element. The vacuum feeding assembly 140 also includes a backflushing mechanism 143. The backflushing mechanism 143 is installed on the top of the vacuum feeding hopper 141 and communicates with the internal space of the filter element. By setting the backflushing mechanism 143, the inside of the vacuum feeding hopper 141 can be backflushed (especially the filter cartridge) to avoid filter cartridge blockage, thereby achieving a good cleaning effect on the filter cartridge, and also achieving a good cleaning effect on the inner wall of the vacuum feeding hopper 141 and the feed hopper 1254. This helps to improve the feeding efficiency of the vacuum feeding assembly 140.

[0052] Specifically, the top of the vacuum feeding hopper 141 has an inlet and outlet port that communicates with the internal space of the filter element. The backflushing mechanism 143 includes a backflushing main unit 1431, an air storage tank 1432, a backflushing solenoid valve 1433, and a pressure regulating filter 1434. The side wall of the air storage tank 1432 has a first backflushing port (not shown) that communicates with the backflushing main unit 1431, a second backflushing port (not shown) that communicates with the inlet and outlet port, and an air inlet port (not shown) that communicates with the pressure regulating filter 1434.

[0053] By setting up the air storage tank 1432 and the pressure regulating filter 1434, a stable pressure of compressed gas can be provided to the back-blowing host 1431 for back-blowing. The back-blowing time and back-blowing volume of the back-blowing host 1431 can be controlled by the back-blowing solenoid valve 1433. When the molding sand feeding device of the micro-droplet jet molding equipment includes a controller, the controller is connected to the back-blowing solenoid valve 1433 and the pressure regulating filter 1434 respectively, so as to control the blowing time and blowing volume of the back-blowing mechanism 143 through the controller.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A molding sand feeding device for a microdroplet jet molding equipment, characterized in that, include: The frame has spaced loading and unloading stations; A screw conveyor assembly includes a conveying cylinder, a rotating shaft, helical blades, and a sand guide pipe. The conveying cylinder is mounted on the frame and extends from the loading station to the unloading station. The conveying cylinder has an inlet and an outlet on its side walls at the loading and unloading stations, respectively. The inlet and outlet are located on opposite sides of the conveying cylinder. The rotating shaft is rotatably mounted inside the conveying cylinder and extends in the direction from the loading station to the unloading station. The helical blades are sleeved and fixed on the rotating shaft and located inside the conveying cylinder. The orthographic projection of the inlet in the diameter direction of the conveying cylinder is at least partially located on the helical blades. One end of the sand guide pipe is fixed to and communicates with the outlet, and the other end is used for a sealed connection to a quantitative sand feeding device. A drive mechanism is connected to one end of the rotating shaft and is used to drive the rotating shaft to rotate; A vacuum feeding assembly includes a vacuum feeding barrel and a vacuum source; the vacuum feeding barrel is a cylindrical structure with an open bottom; the bottom of the vacuum feeding barrel is installed at the feeding station of the frame, and the bottom opening of the vacuum feeding barrel is sealed and connected to the feed inlet; a feed port is formed on the side wall of the vacuum feeding barrel; the vacuum source is connected and disposed on the vacuum feeding barrel.

2. The molding sand feeding device for a microdroplet jet molding equipment according to claim 1, characterized in that, The screw conveyor assembly further includes a support structure; the support structure includes a mounting plate, a support plate spaced apart from the mounting plate, a support member connecting the mounting plate and the support plate, and a feed hopper fixed to the side of the support plate facing the mounting plate; The mounting plate is detachably mounted on the frame; the pallet has a through hole that is sealed and connected to the large end of the feed hopper; the end of the conveying cylinder with the feed inlet is installed between the pallet and the mounting plate, and the small end opening of the feed hopper is sealed and connected to the feed inlet; the vacuum feeding hopper is detachably mounted on the side of the pallet away from the feed hopper, and the bottom opening of the vacuum feeding hopper is connected to the through hole.

3. The molding sand feeding device for a microdroplet jet molding equipment according to claim 2, characterized in that, It also includes a vibrator; the vibrator is installed on the side wall of the conveying cylinder and located between the pallet and the mounting plate.

4. The molding sand feeding device for a microdroplet jet molding equipment according to claim 3, characterized in that, There are multiple vibrators; all of the multiple vibrators are located between the pallet and the mounting plate, and are installed at intervals along the circumference of the conveying cylinder on the side wall of the conveying cylinder.

5. The molding sand feeding device for a microdroplet jet molding equipment according to claim 2, characterized in that, It also includes a first laser sensor and a controller; the first laser sensor is communicatively connected to the controller and is used to detect the first material level information at the bottom of the vacuum feeding barrel in real time and transmit the first material level information to the controller; the controller is electrically connected to the vacuum source and is used to control the opening and closing of the vacuum source based on the first material level information.

6. The molding sand feeding device for a microdroplet jet molding equipment according to claim 5, characterized in that, It also includes a second laser sensor; the second laser sensor is communicatively connected to the controller and is used to detect the second material level information of the conveying pipe at the outlet in real time and transmit the second material level information to the controller; the controller is also used to control the opening and closing of the drive mechanism and the vacuum source according to the second material level information.

7. The molding sand feeding device for a microdroplet jet molding equipment according to claim 1, characterized in that, The end of the sand guide pipe away from the conveying cylinder is used to be sealed and connected to the sand feeding device via a sealing clamp.

8. The molding sand feeding device for a microdroplet jet molding equipment according to claim 1, characterized in that, The vacuum feeding assembly also includes a filter element installed inside the vacuum feeding barrel; the space between the inlet and the outer wall of the filter element and the inner wall of the vacuum feeding barrel is connected; the bottom opening of the vacuum feeding barrel is connected to the space between the outer wall of the filter element and the inner wall of the vacuum feeding barrel; the vacuum source is connected to the internal space of the filter element.

9. The molding sand feeding device for a microdroplet jet molding equipment according to claim 8, characterized in that, The top of the vacuum feeding barrel is provided with an air inlet and outlet that communicate with the internal space of the filter element; the vacuum feeding assembly also includes a backflushing mechanism; the backflushing mechanism is installed on the top of the vacuum feeding barrel and communicates with the internal space of the filter element.

10. The molding sand feeding device for a microdroplet jet molding equipment according to claim 9, characterized in that, The top of the vacuum feeding barrel is provided with an air inlet and outlet that communicate with the internal space of the filter element; The backflush mechanism includes a backflush main unit, an air tank, a backflush solenoid valve, and a pressure regulating filter; the side wall of the air tank is respectively provided with a first backflush port communicating with the backflush main unit, a second backflush port communicating with the air inlet and outlet, and an air inlet communicating with the pressure regulating filter.

Images