A 3D printed sand core cleaning device

Abstract

The utility model discloses a 3D printing sand core cleaning device, include: box, its upper end opening and inside are divided into sand storage chamber and air chamber by the partition that arranges the interval of up and down, be equipped with a plurality of first air inlet hole that penetrates the upper and lower surface of partition on the partition, the lower surface of partition is equipped with the air inlet channel that links to a plurality of first air inlet hole, and the air chamber is equipped with the inflation interface that links to compressed gas source and is used for the sand outlet of sand, and the circumferential side wall on first air inlet hole is equipped with the air inlet plug, and the air inlet plug extends to air inlet channel and is configured to allow air to pass through while preventing core sand from passing through, the sand outlet gate is slidably arranged on the box and is located below the partition, and a plurality of second air inlet holes that penetrate the upper and lower surfaces of sand outlet gate are arranged on the sand outlet gate, a plurality of second air inlet holes and a plurality of first air inlet hole are arranged staggeredly and are communicated to air inlet channel, and the drive mechanism moves along the horizontal direction to make first air inlet hole open or close. The device provided by the utility model improves production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of casting technology, and specifically relates to a 3D printing sand core cleaning device. Background Technology

[0002] The current 3D printing sand core process used in the market is as follows: First, sand is laid flat in the sand box at a certain thickness. Then, a curing agent is sprayed at the location of the sand core shape. This process is repeated layer by layer until a complete sand core is formed in the sand box. After the sand core is printed layer by layer, a brush is usually used to clean the dry sand around the sand core. Then, the sand core is manually removed from the sand box. Finally, the loose sand and burrs on the surface of the sand core are cleaned.

[0003] The disadvantages of existing technology are:

[0004] (1) After the sand core printing is completed, the dry sand around the sand core needs to be manually swept away with a brush, which is difficult to clean.

[0005] (2) Burrs and loose sand on the inner surface of complex sand cores are difficult to clean manually, and loose sand will affect the casting quality of castings. Utility Model Content

[0006] Based on the above problems, the purpose of this utility model is to provide a 3D printing sand core cleaning device that uses flowing sand to clean the sand core, thereby improving production efficiency.

[0007] To overcome the shortcomings of the existing technology, the technical solution provided by this utility model is as follows:

[0008] A 3D printed sand core cleaning device, comprising:

[0009] The housing has an opening at the top and is internally divided into a sand storage chamber and an air chamber arranged at intervals by a partition. The partition has a plurality of first air inlets penetrating the upper and lower surfaces of the partition. The lower surface of the partition has an air inlet channel communicating with the plurality of first air inlets. The air chamber has an air filling port connected to a compressed air source and a sand discharge port for discharging sand. An air inlet plug is provided on the circumferential sidewall of the first air inlet. The air inlet plug penetrates the height direction of the air inlet channel and is configured to allow air to pass through while preventing core sand from passing through.

[0010] A sand discharge gate is slidably mounted on the housing and located below the partition. The sand discharge gate is provided with a plurality of second air inlets penetrating the upper and lower surfaces of the sand discharge gate. The plurality of second air inlets are arranged alternately with the plurality of first air inlets and are connected to the air inlet channel.

[0011] The drive mechanism is connected to the sand discharge gate and drives the sand discharge gate to move horizontally. When the sand discharge gate extends out of the air chamber to open the first air inlet, the sand discharge gate is in the open state. When the sand discharge gate retracts into the air chamber to close the first air inlet, the sand discharge gate is in the closed state.

[0012] In one embodiment, the lower end of the partition is provided with a plurality of protruding supports that abut against the sand discharge gate, and the plurality of protruding supports form the air intake channel. When the sand discharge gate is in the closed state, the plurality of protruding supports and the plurality of second air intake holes are arranged alternately.

[0013] In one embodiment, the intake plug includes an annular body and a plurality of slits spaced apart circumferentially on the annular body.

[0014] In one embodiment, the width of the slit is 0.1 to 0.2 mm, and the spacing between adjacent slits is 1.5 to 2.5 mm.

[0015] In one embodiment, the drive mechanism includes at least one ball screw assembly installed in the air chamber and a drive motor installed outside the housing and connected to the ball screw assembly, wherein the sand discharge gate is connected to the ball screw assembly and one end extends to the outside of the housing.

[0016] In one embodiment, the lower end of the sand discharge gate is provided with a connecting plate, which is fixedly connected to the ball nut of the ball screw pair.

[0017] In one embodiment, roller assemblies are respectively provided on both sides of the air chamber on the housing, and the sand discharge gate is rotatably connected to the roller assemblies.

[0018] In one embodiment, the bottom of the housing is provided with a support, and the sand discharge port is provided with a sand discharge assembly. The sand discharge assembly includes a sand discharge plug that seals with the sand discharge port and a driving component that drives the sand discharge plug to move closer to or away from the sand discharge port.

[0019] In one embodiment, the driving component is a cylinder, and the bottom of the housing is provided with a cylinder mounting bracket. The cylinder mounting bracket includes a first fixing plate fixed to the bottom of the housing, a second fixing plate arranged below the first fixing plate, and a plurality of connecting rods that connect the first fixing plate and the second fixing plate and are arranged at intervals. The cylinder is mounted on the second fixing plate.

[0020] Compared with the prior art, the advantages of this utility model are:

[0021] 1. Compressed air is passed from the air chamber to the sand storage chamber. The core sand is fluidized by the principle of pneumatic fluidization. This can clean the sand core after 3D printing, remove loose sand or burrs, and eliminate the need for manual cleaning, thus improving production efficiency.

[0022] 2. When cleaning sand cores, a robotic arm is used to grab the sand cores and turn them over in the flowing sand, which can thoroughly clean the sand cores and reduce the intensity of manual labor. After cleaning, the robotic arm is used to remove the sand cores, which reduces the difficulty of removing thick sand cores and reduces labor input costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is one of the structural schematic diagrams of an embodiment of a 3D printing sand core cleaning device according to the present invention;

[0025] Figure 2 This is a second structural schematic diagram of an embodiment of the present utility model;

[0026] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0027] Figure 4 This is a schematic diagram of the structure of the sand discharge port in the open state in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the partition and the sand discharge gate in the embodiment of this utility model;

[0029] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of the middle BB section;

[0030] Figure 7 for Figure 6 Enlarged view of a section at point C;

[0031] Figure 8 This is a schematic diagram of the structure for cleaning the sand core in an embodiment of this utility model;

[0032] in:

[0033] 1. Box body; 1-1. Partition plate; 1-1a. First air inlet; 1-1b. Raised support; 1-2. Sand storage chamber; 1-3. Air chamber; 1-3a. Air filling interface; 1-3b. Sand discharge port; 1-4. First support plate; 1-5. Second support plate;

[0034] 2. Sand discharge gate; 2-1. Second air inlet; 2-2. Connecting plate;

[0035] 3. Exhaust plug; 3-1. Annular body; 3-2. Slit;

[0036] 4. Ball screw assembly;

[0037] 5. Drive motor;

[0038] 6. Sand drain plug;

[0039] 7. Drive components;

[0040] 8. Cylinder mounting bracket; 8-1a. First fixing plate; 8-1b. Second fixing plate; 8-1c. Connecting rod;

[0041] 9. Roller assembly;

[0042] 10. Bracket;

[0043] 11. Robotic arm. Detailed Implementation

[0044] The above solution will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrating the present invention and are not intended to limit the scope of the present invention. The implementation conditions used in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0045] See Figure 1 and Figure 2 The diagram below is a structural schematic of an embodiment of the present invention, which provides a 3D printed sand core cleaning device, including a housing 1, a sand discharge gate 2, and a drive mechanism.

[0046] The housing 1 has an open top and is divided internally by a partition 1-1 into a sand storage chamber 1-2 and an air chamber 1-3 arranged at intervals. The partition 1-1 has multiple first air inlets 1-1a that penetrate the upper and lower surfaces. The lower surface of the partition 1-1 has an air intake channel that connects to the multiple first air inlets 1-1a. The air chamber 1-3 has an air filling port 1-3a connected to a compressed air source and a sand discharge port 1-3b for discharging sand. An air inlet plug 3 is provided on the circumferential side wall of the first air inlet 1-1a. The air inlet plug 3 penetrates the height direction of the air intake channel and is configured to allow air to pass through while preventing core sand from passing through.

[0047] like Figure 7As shown, the air intake plug 3 includes an annular body 3-1 and a plurality of slits 3-2 spaced apart around the annular body 3-1. The slits 3-2 are arranged along the height of the annular body 3-1. The width of each slit 3-2 is 0.1–0.2 mm, the spacing between adjacent slits 3-2 is 1.5–2.5 mm, and the length of each slit 3-2 is greater than the depth of the air intake channel. In this example, the first air intake hole 1-1a is circular, and correspondingly, the annular body 3-1 of the air intake plug 3 is annular. Thus, compressed air in the air chamber 1-3 can enter the sand storage chamber 1-2 through the slits 3-2, but the core sand in the sand storage chamber 1-2 will not enter the air chamber 1-3 through the slits 3-2.

[0048] like Figure 5 and Figure 6 As shown, the sand discharge gate 2 is slidably mounted on the housing 1 and located below the partition 1-1. The sand discharge gate 2 has multiple second air inlets 2-1 penetrating the upper and lower surfaces of the sand discharge gate 2. The multiple second air inlets 2-1 are staggered with multiple first air inlets 1-1a and connected to the air inlet channel. In this way, when 3D printing sand cores or cleaning sand cores, the core sand in the sand storage chamber 1-2 is blocked by the sand discharge gate 2 and will not enter the air chamber 1-3. When cleaning sand cores, the first air inlets 1-1a are opened by moving the sand discharge gate 2, and the compressed air in the air chamber 1-3 can enter the sand storage chamber 1-2 to fluidize the core sand. One end of the sand discharge gate 2 is located inside the air chamber 1-3, and the other end can extend to the outside of the air chamber 1-3. The housing 1 is provided with a through groove for the sand discharge gate 2 to extend into. The through groove is sealed with the sand discharge gate 2 to ensure the airtightness of the air chamber 1-3. A sealing ring can be installed between the through groove and the sand discharge gate 2 to ensure the airtightness. When the sand discharge gate 2 extends out of the air chamber 1-3, the first air inlet 1-1a is opened, and the sand discharge gate 2 is in the open state. When the sand discharge gate 2 retracts into the air chamber, the first air inlet 1-1a is closed, and the sand discharge gate 2 is in the closed state.

[0049] Specifically, a plurality of protruding supports 1-1b are provided at the lower end of the partition 1-1 to abut against the sand discharge gate 2. The plurality of protruding supports 1-1b creates a gap between the partition 1-1 and the sand discharge gate 2, thereby forming an air intake channel between the plurality of protruding supports 1-1b. In order to improve the air intake efficiency, when the sand discharge gate 1-1b is in the closed state, the plurality of protruding supports 1-1b are staggered with the plurality of second air intake holes 2-1, thereby avoiding the protruding supports 1-1b from blocking the second air intake holes 2-1. When the protruding supports 1-1b are arranged on the center line connecting the plurality of second air intake holes 2-1 in the moving direction of the sand discharge gate 2, the size of the protruding supports 1-1b should be larger than the second air intake holes 2-1, so that when the sand discharge gate 2 moves, the protruding supports 1-1b are prevented from entering the second air intake holes 2-1 and blocking the second air intake holes 2-1.

[0050] The drive mechanism includes two ball screw assemblies 4 installed in the air chamber 1-3 and a drive motor 5 installed outside the housing 1 and connected to the ball screw assemblies 4. The sand discharge gate 2 is connected to the ball screw assemblies 4 and one end extends outside the housing 1. The ball screw assemblies 4 are existing technology and include a ball screw and a ball nut slidably connected to the ball screw. The ball screw is rotatably supported on the housing 1 via a bearing assembly. A connecting plate 2-2 is provided at the lower end of the sand discharge gate 2, and the connecting plate 2-2 is fixedly connected to the ball nut.

[0051] To facilitate the sliding connection between the sand discharge gate 2 and the housing 1, such as Figure 8 As shown, roller assemblies 9 are respectively provided on both sides of the air chamber 1-3 in the direction of movement of the sand discharge gate 2 on the housing 1. The sand discharge gate 2 is tumblingly connected to the roller assemblies 9. Specifically, a first support plate 1-4 arranged vertically is provided on both sides of the air chamber 1-3, and a second support plate 1-5 arranged horizontally is provided on both sides of the air chamber 1-3. The roller assembly 9 includes multiple rollers that are tumblingly arranged between the first support plate 1-4 and the second support plate 1-5. The lower end face of the sand discharge gate 2 is tumblingly engaged with the multiple rollers.

[0052] After core making and cleaning are completed, in order to facilitate the discharge of core sand in the air chambers 1-3, a bracket 10 is provided at the bottom of the housing 1, and a sand discharge assembly is provided at the sand discharge port 1-3b. The sand discharge assembly includes a sand discharge plug 6 that is sealed to the sand discharge port 1-3b and a driving component 7 that drives the sand discharge plug 6 to move closer to or away from the sand discharge port.

[0053] The drive component 7 uses a cylinder, and a cylinder mounting bracket 8 is provided at the bottom of the housing 1. Specifically, as shown in the figure... Figure 3 As shown, the cylinder mounting bracket 8 includes a first fixing plate 8-1a fixed to the bottom of the housing 1, a second fixing plate 8-1b arranged below the first fixing plate 8-1a, and multiple connecting rods 8-1c arranged at intervals connecting the first fixing plate 8-1a and the second fixing plate 8-1b. The cylinder is mounted on the second fixing plate 8-1b. Figure 4 As shown, the sand discharge plug 6 is moved up and down by the cylinder to open or close the sand discharge port 1-3b.

[0054] The working principle of this utility model is as follows:

[0055] A sand core is printed in the sand storage chamber 1-2 using conventional 3D printing technology. The sand core is clamped by a robotic arm 11, and compressed air is introduced into the air chamber 1-3. The compressed air passes through the second air inlet 2-1 on the sand discharge gate 2, and then through the air inlet channel and the first air inlet 1-1a into the sand storage chamber 1-2 (airflow direction as follows). Figure 5 As shown in the figure, the core sand is fluidized, and the robot arm 11 drives the sand core to turn over in the flowing sand to complete the cleaning and remove the floating sand or burrs.

[0056] In summary, this cleaning device can use flowing sand to clean sand cores, thereby improving production efficiency.

[0057] The above examples are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A 3D printed sand core cleaning device, characterized in that, include: The housing has an opening at the top and is internally divided into a sand storage chamber and an air chamber arranged at intervals by a partition. The partition has a plurality of first air inlets penetrating the upper and lower surfaces of the partition. The lower surface of the partition has an air inlet channel communicating with the plurality of first air inlets. The air chamber has an air filling port connected to a compressed air source and a sand discharge port for discharging sand. An air inlet plug is provided on the circumferential sidewall of the first air inlet. The air inlet plug penetrates the height direction of the air inlet channel and is configured to allow air to pass through while preventing core sand from passing through. A sand discharge gate is slidably mounted on the housing and located below the partition. The sand discharge gate is provided with a plurality of second air inlets penetrating the upper and lower surfaces of the sand discharge gate. The plurality of second air inlets are arranged alternately with the plurality of first air inlets and are connected to the air inlet channel. The drive mechanism is connected to the sand discharge gate and drives the sand discharge gate to move horizontally. When the sand discharge gate extends out of the air chamber to open the first air inlet, the sand discharge gate is in the open state. When the sand discharge gate retracts into the air chamber to close the first air inlet, the sand discharge gate is in the closed state.

2. The 3D printed sand core cleaning device of claim 1, wherein: The lower end of the partition is provided with several protruding supports that abut against the sand discharge gate. The air intake channel is formed between the several protruding supports. When the sand discharge gate is in the closed state, the several protruding supports and the multiple second air intake holes are arranged alternately.

3. The 3D printing core cleaning device according to claim 1, characterized in that: The intake plug includes an annular body and a plurality of slits spaced apart in the circumferential direction of the annular body.

4. The 3D printing core cleaning device according to claim 3, characterized in that: The width of the slit is 0.1 to 0.2 mm, and the distance between adjacent slits is 1.5 to 2.5 mm.

5. The 3D printing core cleaning device according to claim 1, characterized in that: The drive mechanism includes at least one ball screw pair installed in the air chamber and a drive motor installed outside the housing and connected to the ball screw pair. The sand discharge gate is connected to the ball screw pair and one end extends to the outside of the housing.

6. The 3D printing core cleaning device according to claim 5, characterized in that: The lower end of the sand discharge gate is provided with a connecting plate, which is fixedly connected to the ball nut of the ball screw pair.

7. The 3D printing core cleaning device according to claim 1, characterized in that: Roller assemblies are respectively provided on both sides of the air chamber on the housing, and the sand discharge gate is rotatably connected to the roller assemblies.

8. The 3D printing core cleaning device according to claim 1, characterized in that: The bottom of the box is provided with a bracket, and the sand discharge port is provided with a sand discharge assembly. The sand discharge assembly includes a sand discharge plug that seals with the sand discharge port and a driving component that drives the sand discharge plug to move closer to or away from the sand discharge port.

9. The 3D printing core cleaning device according to claim 8, characterized in that: The driving component is a cylinder. The bottom of the housing is provided with a cylinder mounting bracket. The cylinder mounting bracket includes a first fixing plate fixed to the bottom of the housing, a second fixing plate arranged below the first fixing plate, and multiple connecting rods that connect the first fixing plate and the second fixing plate and are arranged at intervals. The cylinder is mounted on the second fixing plate.

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