Sand cleaning device for leeward area of 3D printing sand mold

Abstract

The utility model discloses a sand cleaning device for a leeward area of a 3D printing sand mold. One end of a main air pipe is communicated with an external high-pressure air source, and a valve body is connected between the main air pipe and the external high-pressure air source in series; and one end of the blowing hose communicates with the end, away from the external high-pressure air source, of the main air pipe, the other end of the blowing hose is open, a steel ball is embedded in the other end of the blowing hose in a sealed mode, and blowing holes are formed in the side wall of the blowing hose and can be aligned with the leeward area of the 3D printing sand mold. By designing the main air pipe and the valve body which are communicated with the air blowing hose, the air blowing hose can reliably ventilate, and the air blowing speed of the air blowing hose is adjustable; the pipe wall of the air blowing hose is provided with air blowing holes capable of being aligned with the leeward area of the 3D printing sand mold, high-speed airflow sprayed out of the air blowing holes can directly blow the leeward area, and residual sand in the leeward area can be completely blown out. One end of the blowing hose is plugged with a steel ball, the steel ball can force airflow in the blowing hose to reverse, the steel ball can increase the weight of the end, away from the main air pipe, of the blowing hose, and the blowing hose can be conveniently inserted into the sand mold.

Description

Technical Field

[0001] The utility model relates to the field of casting, and more specifically to a sand cleaning device for a leeward area of ​​a 3D printed sand mold. Background Art

[0002] 3D printing sand mold technology is a branch of additive manufacturing, mainly used in the foundry industry. It can quickly and accurately produce complex sand molds and sand cores, suitable for precision casting of metal parts. In the process of 3D printing sand molds, the leeward area (i.e. the area where airflow is not easy to reach) and the stability of the sand mold are one of the key design considerations.

[0003] In the casting process, the leeward area of ​​the complex structure sand mold refers to: when the fluid flows along a specified path in a closed container (mold), the pressure opposite to the direction of movement is applied due to obstacles or sharp turns. These areas may have problems with insufficient drying or bonding of the sand mold, thus affecting the quality of the final casting. For example, defects such as pores and sand inclusions often appear in the leeward area.

[0004] The parting principle of 3D printing sand mold is to distribute the entire mold cavity on one sand mold as much as possible on the basis of cleaning up the residual sand, or to reduce core sticking as much as possible.

[0005] If the above-mentioned leeward structure that cannot be further parted is encountered, the only way to clean the residual sand here is to inject steel shots and rotate them repeatedly. This method has low sand cleaning efficiency and poor sand cleaning effect, which may eventually lead to unqualified casting structure and size.

[0006] Therefore, how to provide a sand cleaning device for the leeward area of ​​a 3D printed sand mold so that it can overcome the above problems is an issue that technical personnel in this field urgently need to solve. Utility Model Content

[0007] In view of this, the utility model provides a sand cleaning device for the leeward area of ​​a 3D printed sand mold.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A sand cleaning device for a leeward area of ​​a 3D printed sand mold is used to clean the leeward area of ​​the 3D printed sand mold, comprising:

[0010] A main air pipe, one end of which is connected to an external high-pressure air source and a valve body is connected in series therebetween;

[0011] An air blowing hose, one end of which is connected to an end of the main air pipe away from the external high-pressure air source, the other end of which is open and sealed with a steel ball, and an air hole is provided on the side wall of the air blowing hose, which can be aligned with the leeward area.

[0012] It can be known from the above technical scheme that compared with the prior art, the utility model discloses a sand cleaning device for the leeward area of ​​a 3D printed sand mold. The utility model designs a main air pipe and a valve body connected to the blowing hose, so that the blowing hose can be reliably ventilated, and the blowing rate of the blowing hose is adjustable; a blowing hole that can be aligned with the leeward area of ​​the 3D printed sand mold is provided on the tube wall of the blowing hose, and the high-speed airflow ejected from the blowing hole can directly blow into the leeward area, and the residual sand in the leeward area can be completely blown out; one end of the blowing hose is blocked with a steel ball, and the steel ball can block one end of the blowing hose on the one hand, forcing the airflow in the blowing hose to change direction, and on the other hand, the steel ball can increase the weight of the end of the blowing hose away from the main air pipe, which is beneficial for the blowing hose to enter the sand mold.

[0013] Preferably, the inner diameter of the main air pipe is larger than the inner diameter of the air blowing hose. The airflow in the main air pipe will accelerate after entering the air blowing hose, and the air blowing hose can be smoothly inserted into the sand mold.

[0014] Preferably, the end of the main air pipe away from the external high-pressure air source and the end of the air blowing hose away from the steel ball are fixed and connected through a reducer. The main air pipe and the air blowing hose can be reliably connected and fixed.

[0015] Preferably, the air blowing hose is provided with a plurality of air blowing holes, and the plurality of air blowing holes are arranged in sequence along the tube length direction of the air blowing hose. This design can improve the sand cleaning efficiency.

[0016] Preferably, the steel balls are provided in plurality and are arranged in sequence along the length direction of the air blowing hose. The steel balls can reliably block one end of the air blowing hose.

[0017] Preferably, there are two steel balls, which can reliably block the air blowing hose.

[0018] Preferably, the end of the air blowing hose away from the main air pipe is sealed with hot melt adhesive, and the plurality of steel balls are sealed and bonded to the inside of the air blowing hose by the hot melt adhesive. When the air blowing hose is inflated, the steel balls will not fall out of the main air pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1It is a connection diagram of a sand cleaning device for the leeward area of ​​a 3D printed sand mold;

[0021] Figure 2 It is a partial schematic diagram of a sand cleaning device in the leeward area of ​​a 3D printed sand mold.

[0022] In the figure:

[0023] 1 is the 3D printing sand mold, 2 is the leeward area, 3 is the unobstructed passage, 4 is the main air pipe, 5 is the valve body, 6 is the air blowing hose, 7 is the steel ball, 8 is the air blowing hole, and 9 is the reducer. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The utility model discloses a sand cleaning device for the leeward area of ​​a 3D printing sand mold. The utility model designs a main air pipe 4 and a valve body 5 connected with an air blowing hose 6, so that the air blowing hose 6 can be reliably ventilated, and the air blowing rate of the air blowing hose 6 is adjustable;

[0026] The inner diameter of the main air pipe 4 is larger than that of the air blowing hose 6. The two can be reliably fixed and connected through a reducer (9). The airflow in the main air pipe 4 will increase in velocity after entering the air blowing hose 6, and the sand can be subsequently cleaned by blowing.

[0027] The wall of the air blowing hose 6 is provided with an air blowing hole 8 which can be aligned with the leeward area 2 of the 3D printing sand mold 1. The high-speed airflow ejected from the air blowing hole 8 can directly blow the leeward area 2, and the residual sand in the leeward area 2 can be completely blown out;

[0028] One end of the blowing hose 6 is blocked with a steel ball 7. On the one hand, the steel ball 7 can block one end of the blowing hose 6, forcing the air flow in the blowing hose 6 to change direction. On the other hand, the steel ball 7 can increase the weight of the end of the blowing hose 6 away from the main air pipe 4, which is conducive to the blowing hose 6 entering the sand mold.

[0029] The hot melt adhesive in the blowing hose 6 can seal it on the one hand, and ensure that the steel ball 7 can be reliably sealed and fixed in the blowing hose 6 on the other hand.

[0030] Example

[0031] See attached Figure 1-2The utility model is a schematic diagram of the overall and partial structures of an embodiment of the utility model. The utility model specifically discloses a sand cleaning device for the leeward area of ​​a 3D printing sand mold, which cleans the leeward area 2 of the 3D printing sand mold 1. The leeward area 2 refers to a cavity or hole in the sand mold that is nearly vertical to the smooth passage 3, that is, an area where the gas cannot be blown directly when high-pressure air is blown to the smooth passage 3; the sand cleaning device includes:

[0032] A main air pipe 4, one end of which is circular in cross section and connected to an external high-pressure air source, and a valve body 5 is connected in series between the two. The external high-pressure air source in this embodiment is an air pump, and the valve body 5 can control the on-off of the main air pipe 4 and the size of the ventilation flow;

[0033] The blowing hose 6, whose inner and outer contours are both circular in cross section, is connected at one end to the end of the main air pipe 4 away from the external high-pressure air source, and the other end of the blowing hose 6 is open and sealed with a steel ball 7, which can block the end of the blowing hose 6 away from the main air pipe 4. A plurality of blowing holes 8 are provided on the side wall of the blowing hose 6, and the blowing holes 8 can be aligned with the leeward area 2 of the 3D printing sand mold 1 by pulling or rotating the blowing hose 6; the high-pressure gas blown out from the blowing holes 8 can directly blow the leeward area 2 of the sand mold.

[0034] The inner diameter of the main air pipe 4 is larger than the inner diameter of the blowing hose 6; this design has two purposes, one is to ensure that the blowing hose 6 can be smoothly inserted into the sand mold, and the other is that when the inner diameter of the pipe changes from large to small, the air flow velocity in the blowing hose 6 will increase when the output air pressure of the external high-pressure air source remains unchanged.

[0035] The end of the main air pipe 4 away from the external high-pressure air source and the end of the air blowing hose 6 away from the steel ball 7 are fixed and connected through a reducer 9; the reducer 9 can reliably fix and connect the main air pipe 4 and the air blowing hose 6.

[0036] A plurality of blowing holes 8 are provided on the blowing hose 6, and the plurality of blowing holes 8 are arranged in sequence along the tube length direction of the blowing hose 6. At the same time, the plurality of blowing holes 8 are also arranged in sequence along the circumference of the blowing hose 6, and the angle between each two adjacent blowing holes 8 along the circumference of the blowing hose 6 can be 90°; the number and arrangement of the blowing holes 8 can be determined by the number and arrangement of the leeward area 2 connected to the unobstructed passage 3 in the sand mold, and the plurality of blowing holes 8 can improve the sand cleaning efficiency.

[0037] There are multiple steel balls 7 and they are arranged in sequence along the length direction of the blowing hose 6. In this embodiment, there are two steel balls 7, and the two steel balls 7 can reliably block one end of the blowing hose 6. The steel ball 7 is designed for at least two purposes: the first is to block one end of the blowing hose 6, forcing the high-pressure airflow to change direction and flow out from the blowing hole 8; the second is to act as a counterweight for the end of the blowing hose 6 away from the main air pipe 4, so as to facilitate the insertion of the blowing hose 6 into the sand mold.

[0038] The inside of one end of the blowing hose 6 away from the main air pipe 4 is sealed with hot melt adhesive, and multiple steel balls 7 are sealed and bonded to the inside of the blowing hose 6 by hot melt adhesive; the outer diameter of the steel ball 7 is the same as the inner diameter of the blowing hose 6. To ensure that the steel ball 7 can be reliably fixed on the inside of the blowing hose 6 and seal one end of the blowing hose 6, the steel ball 7 can be fixed to the inside of the blowing hose 6 by hot melt adhesive. The hot melt adhesive can be filled between the two steel balls 7. The hot melt adhesive is in contact with the inner wall of the blowing hose 6 and the outer walls of the two steel balls 7 at the same time. On the one hand, the hot melt adhesive itself can also seal the blowing hose 6, and on the other hand, it can reliably bond the steel ball 7 and the inner wall of the blowing hose 6.

[0039] When the sand cleaning device is in use, the staff adjusts the valve body 5 so that the blowing hole 8 has a suitable blowing rate, and the air flow velocity at the blowing hole 8 reaches 10-15m / s; the staff inserts one end of the blowing hose 6 with the steel ball 7 into the unobstructed channel 3 in the sand mold, and then the staff pulls or rotates the blowing hose 6, and the residual sand in the leeward area 2 connected to the above-mentioned unobstructed channel 3 can be brought out by the high-pressure gas blown out from the blowing hole 8, and the residual sand in the sand mold will eventually be blown out in the opposite direction from the entrance of the unobstructed channel 3.

[0040] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sand cleaning device for the leeward area of ​​a 3D printed sand mold, for cleaning the leeward area (2) of a 3D printed sand mold (1), characterized in that: include: A main air pipe (4), one end of which is connected to an external high-pressure air source and a valve body (5) is connected in series therebetween; An air blowing hose (6), one end of which is connected to an end of the main air pipe (4) away from the external high-pressure air source, the other end of which is open and sealed with a steel ball (7), and an air blowing hole (8) is provided on the side wall of the air blowing hose (6), and the air blowing hole (8) can be aligned with the leeward area (2).

2. A sand cleaning device for the leeward area of ​​a 3D printing sand mold according to claim 1, characterized in that: The inner diameter of the main air pipe (4) is greater than the inner diameter of the air blowing hose (6).

3. A sand cleaning device for the leeward area of ​​a 3D printing sand mold according to claim 2, characterized in that: An end of the main air pipe (4) away from the external high-pressure air source and an end of the air blowing hose (6) away from the steel ball (7) are fixed and communicated via a reducing joint (9).

4. A sand cleaning device for the leeward area of ​​a 3D printing sand mold according to claim 1, characterized in that: The air blowing hose (6) is provided with a plurality of air blowing holes (8), and the plurality of air blowing holes (8) are arranged in sequence along the tube length direction of the air blowing hose (6).

5. The sand cleaning device for the leeward area of ​​a 3D printing sand mold according to claim 1, characterized in that: The steel balls (7) are provided in plurality and are arranged in sequence along the tube length direction of the air blowing hose (6).

6. A sand cleaning device for the leeward area of ​​a 3D printing sand mold according to claim 5, characterized in that: The steel balls (7) are provided with two.

7. A sand cleaning device for the leeward area of ​​a 3D printing sand mold according to claim 5, characterized in that: The interior of the air blowing hose (6) at one end away from the main air pipe (4) is sealed with hot melt adhesive, and the plurality of steel balls (7) are sealed and bonded to the interior of the air blowing hose (6) via the hot melt adhesive.

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