Sand shooting device

Abstract

The utility model discloses a sand shooting device, which comprises a sand shooting cylinder, a sand shooting device, a sand spraying device and a sand spraying device, the sand shooting cylinder is provided with an air inlet channel and an air outlet channel which are arranged at intervals, and the air inlet channel comprises at least one air inlet pipeline arranged in the sand shooting cylinder; the pile-up valve is movably arranged relative to the sand shooting cylinder, the pile-up valve is provided with an air inlet cavity and an air outlet cavity which are arranged at an interval, the air inlet cavity is communicated with the air inlet channel, an air inlet net is arranged at the air outlet end of the pile-up valve, the air outlet cavity is communicated with the air outlet channel, and an air outlet net is arranged at the air inlet end of the pile-up valve; the shooting plate is mounted at the bottom of the sand shooting cylinder, and at least two shooting holes communicated to the interior of the sand shooting cylinder are formed in the shooting plate; and each gas inlet pipeline is arranged between at least two adjacent perforations, and the gas outlet ends of the gas inlet pipelines are close to the adjacent perforations. The sand shooting device provided by the utility model can ensure the quality of a sand core and reduce the accumulation of residual sand.

Description

TECHNICAL FIELD

[0001] The utility model belongs to foundry technology field, especially relate to a sand shooting device. BACKGROUND

[0002] The working principle of the core shooter is mainly to shoot the core sand mixture containing thermosetting resin into the heated core box, the sand core is preheated in the core box and quickly hardened to a certain thickness (about 5-10mm), and then taken out, forming a high-quality sand core product with smooth surface and accurate size.

[0003] As shown in Figure 1 The sand shooting device in the prior art comprises an integrated valve 100 and a sand shooting cylinder 200 matched with the integrated valve 100, an air inlet channel 101 and an air outlet channel 102 are arranged on the integrated valve 100, the air inlet channel 101 and the air outlet channel 102 are communicated with the sand shooting cylinder 200 through the same air hole, an exhaust screen 400 is arranged in the air hole, and a shooting plate 300 is arranged at the lower end of the sand shooting cylinder 200, and a plurality of nozzles 301 are arranged on the shooting plate 300.

[0004] When shooting sand, the integrated valve 100 and the sand shooting cylinder 200 are connected, the air inlet channel 101 starts to enter compressed gas under the closed state of the air outlet channel 102, the compressed gas passes through the exhaust screen 400 and then pushes the sand particles through the core sand gap, forming a sand gas flow, and the sand gas flow is shot out from the nozzle at high speed, and at the same time of shooting sand, the sand gas flow applies pressure to the core sand, so that the core sand is compacted. The degree of compaction can be controlled by adjusting the pressure of the compressed air and the sand shooting time.

[0005] After shooting sand, the air inlet channel 101 is closed, the air outlet channel 102 is opened, and the residual pressure in the sand shooting cylinder 200 is discharged, which can effectively avoid the problem of air retention.

[0006] The sand shooting device has the following defects:

[0007] (1) There is residual sand problem, the existing typical sand shooting cylinder structure often has residual sand in the inside of the sand shooting cylinder after multiple sand shooting, and the phenomenon that the sand is not completely shot out, the main reason for the residual sand problem is that the friction between the sand particles causes the accumulation angle to be difficult to drop sand, and it is also related to the shape of the sand shooting cylinder and the shape of the shooting hole position, for example, if the channel structure inside the sand shooting cylinder has a corner or a narrow part, the sand flow will be hindered when passing through these places. For example, when the sand flow changes direction, part of the kinetic energy of the sand will be lost, causing the sand to accumulate in the channel, thereby causing residual sand, and the size and position of the shooting hole also affect the complete shooting of the sand. If the outlet is too small, at the end of sand shooting, the sand near the outlet edge is left due to friction and other factors. Residual sand will cause waste, affect the quality of the sand core, and reduce the working efficiency of the core making machine.

[0008] (2) The airflow path is too long during sand shooting, resulting in a large pressure loss. The sand shooting method is to enter the air from the top. The airflow path from the top of the core sand to the actual nozzle sand outlet is too long, resulting in airflow pressure loss. At the same time, the core sand is affected by gravity, and the state of the shot core sand is inconsistent, which leads to the instability of the sand shooting process and makes it very easy to cause the sand core to be shot incompletely.

[0009] (3) Since the intake and exhaust use the same exhaust screen, sand may stick to the exhaust screen during the exhaust stage; at the same time, the same integrated valve (exhaust screen) is used. If the exhaust screen is damaged, core sand can easily enter and cause blockage during the exhaust stage. Utility Model Content

[0010] Based on the above problems, the purpose of this utility model is to provide a sand-shooting device that can reduce the pressure loss during sand shooting and ensure the quality of the sand core.

[0011] To overcome the shortcomings of the existing technology, the technical solution provided by this utility model is as follows:

[0012] A sand-shooting device, comprising:

[0013] A sand-shooting barrel having a separately arranged air inlet channel and an air outlet channel, the air inlet channel including at least one air inlet pipe arranged inside the sand-shooting barrel;

[0014] An integrated valve is movably configured relative to the sand-shooting cylinder. The integrated valve has an air inlet chamber and an air outlet chamber arranged at intervals. The air inlet chamber is connected to the air inlet channel and has an air inlet screen at the air outlet end. The air outlet chamber is connected to the air outlet channel and has an air outlet screen at the air inlet end.

[0015] A firing plate is installed at the bottom of the sand-shooting cylinder, and the firing plate has at least two firing holes communicating with the interior of the sand-shooting cylinder;

[0016] Each of the aforementioned intake pipes is arranged between at least two adjacent perforations, with the outlet end positioned close to the adjacent perforation.

[0017] In one embodiment, the axis of the intake pipe is arranged on a circle with the center of the adjacent perforation and a radius of 20 to 150 mm.

[0018] In one embodiment, the distance between the air outlet end of the air inlet pipe and the spray plate is 5 to 100 mm.

[0019] In one embodiment, the air intake channel further includes an airflow distribution chamber disposed in the upper part of the sand-shooting cylinder, the air intake ends of the plurality of air intake pipes are connected to the airflow distribution chamber, and the outer periphery of the air intake channel forms the air outlet channel.

[0020] In one embodiment, the sand-shooting cylinder includes a first cylinder and a second cylinder that are detachably connected vertically, the air intake channel extends from the first cylinder into the second cylinder, and the second cylinder is detachably connected to the shooting plate.

[0021] In one embodiment, a first sealing ring is provided between the first cylinder and the second cylinder, and a second sealing ring is provided between the second cylinder and the injection plate.

[0022] In one embodiment, the outer periphery of the airflow distribution cavity is provided with a plurality of connecting ribs to connect the airflow distribution cavity to the first cylinder.

[0023] In one embodiment, the integrated valve includes a first support portion located on the outer periphery and a second support portion disposed on the inner periphery of the first support portion. The air inlet chamber is formed inside the second support portion, and the gap between the first support portion and the second support portion forms the air outlet chamber. The first support portion is provided with an air inlet communicating with the air inlet chamber and an air outlet communicating with the air outlet chamber.

[0024] In one embodiment, a mounting bracket is also included that is fixedly connected to the first support portion, the mounting bracket being disposed over the upper end of the sand-shooting cylinder.

[0025] In one embodiment, a third sealing ring is provided between the mounting bracket and the sand-shooting cylinder, and a fourth sealing ring is provided between the second support and the sand-shooting cylinder.

[0026] Compared with the prior art, the advantages of this utility model are:

[0027] 1. Compressed air is directed to the vicinity of the perforation hole to form a sand jet, reducing the airflow path and thus reducing the pressure loss caused by the airflow passing through the sand core, thereby ensuring the quality of the sand core;

[0028] 2. By using airflow to drive the bottom core sand out of the perforation hole, the core sand above the perforation hole can fall freely under the influence of gravity, effectively reducing the amount of residual sand accumulation from 30% to less than 5%, ensuring the environmental friendliness and precision of the equipment;

[0029] 3. The air intake and exhaust positions are designed with a height difference and completely isolate the air intake and exhaust channels, effectively avoiding the backflow of sand caused by the air trapped inside the gun barrel after sand injection and the problem of sand entering the air intake channel. Attached Figure Description

[0030] 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.

[0031] Figure 1 This is a schematic diagram of the structure of a sand-shooting device in the prior art;

[0032] Figure 2 This is a schematic diagram of the structure of an embodiment of the sand-shooting device of this utility model;

[0033] Figure 3 This is a partial cross-sectional structural diagram of an embodiment of the present utility model;

[0034] Figure 4 This is a schematic diagram of the integrated valve in an embodiment of the present invention;

[0035] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of the middle AA section;

[0036] Figure 6 This is a schematic diagram of the mounting bracket in an embodiment of the present invention;

[0037] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure of the middle BB section;

[0038] Figure 8 This is a schematic diagram showing the distribution of gas pipelines in an embodiment of this utility model;

[0039] in:

[0040] 100. Integrated valve; 101. Air inlet channel; 102. Air outlet channel; 200. Shot gun; 300. Shot plate; 301. Nozzle; 400. Exhaust screen;

[0041] 1. Integrated valve; 1-1. First support part; 1-2. Second support part; 1-2a. Fourth limiting groove; 1-3. Air inlet chamber; 1-4. Air outlet chamber; 1-5. Air inlet; 1-6. Air outlet; 1-7. Mounting bracket; 1-7a. Third limiting groove;

[0042] 2. Shot-firing cylinder; 2-1. First cylinder body; 2-1a. Air inlet pipe; 2-1b. Airflow distribution chamber; 2-1c. Branch pipe; 2-1d. Connecting rib; 2-2. Second cylinder body;

[0043] 3. Shooting plate; 3-1. Shooting hole;

[0044] 4. Drive components;

[0045] 5. Air intake grille;

[0046] 6. Vent net;

[0047] 7. First sealing ring;

[0048] 8. Second sealing ring;

[0049] 9. Third sealing ring;

[0050] 10. Fourth sealing ring;

[0051] 11. Sand core. Detailed Implementation

[0052] 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.

[0053] See Figure 2 and Figure 3 The above is a structural schematic diagram of an embodiment of the present utility model, which provides a sand-shooting device, including a sand-shooting cylinder 2, an integrated valve 1 movably disposed relative to the sand-shooting cylinder 2, and a shooting plate 3 installed at the bottom of the sand-shooting cylinder 2, wherein a plurality of shooting holes 3-1 are provided on the shooting plate 3.

[0054] The sand-shooting cylinder 2 has separate air inlet and outlet channels. The air inlet channels include multiple air inlet pipes 2-1a arranged within the sand-shooting cylinder 2. Each air inlet pipe 2-1a is positioned between at least two adjacent perforations 3-1, with its outlet end close to the adjacent perforation 3-1. The air inlet pipes 2-1a are arranged vertically, with their axis aligned on a circle R centered on the center of the adjacent perforation 3-1 and having a radius of 20–150 mm. Preferably, the distance L between the outlet end of the air inlet pipe 2-1a and the shooting plate 3 is 5–100 mm. This arrangement ensures that compressed gas is distributed to each perforation 3-1 via the air inlet pipes 2-1a without interference, reducing pressure loss and resulting in a higher gas content in the final sand stream. This effectively forms a gas-solid two-phase sand stream, ultimately improving the quality of the sand core.

[0055] like Figure 8The diagram illustrates the fabrication of multiple sand cores 11 using the same injection plate 3-1. For a small sand core 11 with two injection holes 3-1, the air intake pipe 2-1a is positioned between the two injection holes 3-1. For a large sand core 11 with multiple injection holes 3-1, the air intake pipe 2-1a can be positioned between two adjacent injection holes 3-1 or between three adjacent injection holes 3-1. In other embodiments, the air intake pipe can also be positioned between four or five adjacent injection holes, depending on the specific requirements. This invention does not impose any limitations. It should be understood that in other embodiments, a separate sand core can be fabricated using a corresponding injection plate. For example, to fabricate a small sand core, two injection holes can be provided on the injection plate. In this case, only one air intake pipe needs to be provided and positioned between the two injection holes.

[0056] To facilitate the installation of multiple air intake pipes 2-1a, the air intake channel also includes an airflow distribution chamber 2-1b fixed in the upper part of the sand-shooting cylinder 2. The air intake end of the air intake pipe 2-1a is connected to the airflow distribution chamber 2-1b via a branch pipe 2-1c, forming an air outlet channel on the outer periphery of the air intake channel.

[0057] To facilitate component replacement, the sand-shooting cylinder 2 includes a first cylinder 2-1 and a second cylinder 2-2 that are detachably connected. The air intake channel extends from the first cylinder 2-1 to the second cylinder 2-2, and the second cylinder 2-2 is detachably connected to the shooting plate 3.

[0058] To improve sealing performance, a first sealing ring 7 is provided between the first cylinder 2-1 and the second cylinder 2-2, and a second sealing ring 8 is provided between the second cylinder 2-2 and the injection plate 3. Specifically, a first limiting groove for installing the first sealing ring 7 is provided at the upper end of the second cylinder 2-2, and a second limiting groove for installing the second sealing ring 8 is provided at the lower end of the second cylinder 2-2.

[0059] To improve the stability of the air intake channel structure, multiple connecting ribs 2-1d are provided on the outer periphery of the airflow distribution cavity 2-1b to connect the airflow distribution cavity 2-1b with the first cylinder 2-1.

[0060] like Figure 4 and Figure 5 As shown, the integrated valve 1 is movably positioned relative to the sand-shooting cylinder 2, specifically connected to a drive component 4. The drive component 4 moves the integrated valve closer to or away from the sand-shooting cylinder 2. The drive component 4 can be a cylinder. The integrated valve 1 has an air inlet chamber 1-3 and an air outlet chamber 1-4 arranged at intervals. The air inlet chamber 1-3 is connected to the air inlet channel and has an air inlet mesh 5 at its outlet end. The air outlet chamber 1-4 is connected to the air outlet channel and has an air outlet mesh 6 at its inlet end.

[0061] The integrated valve 1 includes a first support portion 1-1 located on the outer periphery and a second support portion 1-2 disposed on the inner periphery of the first support portion 1-1. An air inlet chamber 1-3 is formed inside the second support portion 1-2, and an air outlet chamber 1-4 is formed in the gap between the first support portion 1-1 and the second support portion 1-2. An air inlet 1-5 communicating with the air inlet chamber 1-3 and an air outlet 1-6 communicating with the air outlet chamber 1-4 are provided on the first support portion 1-1.

[0062] The air intake mesh 5 is welded and fixed to the inner wall of the second support part 1-2, and the air outlet mesh 6 has a ring structure and is arranged on the outer periphery of the second support part 1-2. The air outlet mesh 6 is fixed to the first support part 1-1 by screws.

[0063] like Figure 6 and Figure 7 As shown, in order to facilitate the connection between the integrated valve 1 and the sand-shooting cylinder 2, a mounting bracket 1-7 is also included, which is fixedly connected to the first support part 1-1. The mounting bracket 1-7 covers the upper end of the sand-shooting cylinder 2.

[0064] To improve sealing performance, a third sealing ring 9 is provided between the mounting bracket 1-7 and the sand-shooting cylinder 2, and a fourth sealing ring 10 is provided between the second support 1-2 and the sand-shooting cylinder 2. Specifically, a third limiting groove 1-7a is provided on the mounting bracket 1-7 to accommodate the third sealing ring 9, and a fourth limiting groove 1-2a is provided on the second support 1-2 to accommodate the fourth sealing ring 10.

[0065] The sand-shooting method of the aforementioned sand-shooting device involves arranging at least one air inlet pipe for a sand-shooting cylinder with at least two perforations. Each air inlet pipe is positioned between at least two adjacent perforations, with its outlet end close to the adjacent perforation. The axis of the air inlet pipe is arranged on a circle with a radius of 20–150 mm, centered on the center of the adjacent perforation. Preferably, the distance between the plane containing the outlet end of the air inlet pipe and the inlet end of the corresponding perforation is 5–100 mm. In this way, each perforation has a corresponding air inlet pipe that supplies compressed gas, enabling the formation of a gas-solid two-phase sand flow within the perforation, thereby improving the quality of the sand core.

[0066] The working principle of this utility model is as follows:

[0067] The drive component 4 connects the integrated valve 1 to the sand-shooting cylinder 2. Compressed air is introduced through the air inlet 1-5 on the integrated valve 1. After passing through the air inlet mesh 5, the compressed air reaches the bottom of the first cylinder 2-1 via the air inlet pipe 2-1a, so that the sand in the sand-shooting cylinder 2 is ejected through the injection holes 3-1 on the injection plate 3 to complete the sand-shooting process. Extending the air inlet pipe 2-1a above the corresponding injection hole 3-1 can avoid mutual interference, reduce the airflow path, reduce pressure loss, reduce residual sand accumulation, and ensure the quality of the core shot. After sand-shooting is completed, the exhaust channel is opened to discharge excess gas from the sand-shooting cylinder 2. Because there is a height difference between the air inlet and exhaust positions, and the air inlet and exhaust channels are isolated from each other, the backflow of sand caused by air stagnation inside the sand-shooting cylinder 2 and the problem of sand entering the air inlet channel can be avoided.

[0068] In summary, this sand-shooting device can ensure the quality of sand shooting, reduce the accumulation of residual sand, and avoid backflow caused by air trapped inside the sand-shooting cylinder.

[0069] 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 sand-shooting device, characterized in that, include: A sand-shooting barrel having a separately arranged air inlet channel and an air outlet channel, the air inlet channel including at least one air inlet pipe arranged inside the sand-shooting barrel; An integrated valve is movably configured relative to the sand-shooting cylinder. The integrated valve has an air inlet chamber and an air outlet chamber arranged at intervals. The air inlet chamber is connected to the air inlet channel and has an air inlet screen at the air outlet end. The air outlet chamber is connected to the air outlet channel and has an air outlet screen at the air inlet end. A firing plate is installed at the bottom of the sand-shooting cylinder, and the firing plate has at least two firing holes communicating with the interior of the sand-shooting cylinder; Each of the aforementioned intake pipes is arranged between at least two adjacent perforations, with the outlet end positioned close to the adjacent perforation.

2. The sand-shooting device according to claim 1, characterized in that: The axis of the intake pipe is arranged on a circle with the center of the adjacent injection hole and a radius of 20 to 150 mm.

3. The sand-shooting device according to claim 1, characterized in that: The distance between the air outlet end of the air inlet pipe and the spray plate is 5 to 100 mm.

4. The sand-shooting device according to claim 3, characterized in that: The air intake channel also includes an airflow distribution chamber located in the upper part of the sand-shooting cylinder, and the air intake ends of multiple air intake pipes are connected to the airflow distribution chamber. The outer periphery of the air intake channel forms the air outlet channel.

5. The sand-shooting device according to claim 4, characterized in that: The sand-shooting cylinder includes a first cylinder and a second cylinder that are detachably connected vertically. The air intake channel extends from the first cylinder into the second cylinder, and the second cylinder is detachably connected to the shooting plate.

6. The sand-shooting device according to claim 5, characterized in that: A first sealing ring is provided between the first cylinder and the second cylinder, and a second sealing ring is provided between the second cylinder and the injection plate.

7. The sand-shooting device according to claim 6, characterized in that: The outer periphery of the airflow distribution cavity is provided with multiple connecting ribs to connect the airflow distribution cavity to the first cylinder.

8. The sand-shooting device according to claim 1, characterized in that: The integrated valve includes a first support portion located on the outer periphery and a second support portion disposed on the inner periphery of the first support portion. The air inlet chamber is formed inside the second support portion, and the air outlet chamber is formed by the gap between the first support portion and the second support portion. The first support portion is provided with an air inlet communicating with the air inlet chamber and an air outlet communicating with the air outlet chamber.

9. The sand-shooting device according to claim 8, characterized in that: It also includes a mounting bracket fixedly connected to the first support portion, the mounting bracket being positioned over the upper end of the sand-shooting cylinder.

10. The sand-shooting device according to claim 9, characterized in that: A third sealing ring is provided between the mounting bracket and the sand-shooting cylinder, and a fourth sealing ring is provided between the second support and the sand-shooting cylinder.

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