A hydraulic device for casting sand cores

Abstract

This invention discloses a hydraulic device for casting sand cores, comprising: a top plate, with guide columns fixed around one side wall of the top plate, and a movable plate slidably mounted on the guide columns; a second forming mold mounted on one side wall of the movable plate, with an ejection hole on the inner side of the second forming mold; a hydraulic cylinder fixed to the other side of the top plate, with the output end of the hydraulic cylinder penetrating the top plate and cooperating with the movable plate; a first forming mold fixed to one end of the guide columns by a mounting plate; and a push rod disposed in the middle of one side wall of the top plate, with an elastic component at one end of the push rod cooperating with the top plate. By incorporating a spring, an arc-shaped plate, and a guide block, welding or bolting the push rod to the top plate is avoided, preventing breakage at the connection between the push rod and the top plate when the push rod and the ejection hole are not aligned. The inclusion of air holes, an air inlet pipe, and a flexible hose avoids the need for manual air blowing to clean the interior of the second forming mold after ejection.

Description

Technical Field

[0001] This invention specifically relates to a hydraulic device for casting sand cores. Background Technology

[0002] Sand cores are materials used in the casting process to form cavities or channels inside the mold. They are typically made from a special mixture of sand that has certain binding and high-temperature resistance properties, and the sand cores are formed by hydraulic molding using a mold.

[0003] When making sand cores, the formed sand core is ejected from the mold by an ejector rod. However, the ejector rod is usually fixed by bolts or welding. When the mold position is slightly offset, the ejector rod cannot properly extend into the mold. The ejector rod collides rigidly with the mold, which can cause damage to the ejector rod installation connection and result in poor performance. In addition, the inside of the mold cannot be automatically cleaned during the ejection process. Manual cleaning of the sand residue adhering to the inner wall of the mold is required by blowing air with an air gun, which is inconvenient. Therefore, we propose a hydraulic device for casting sand cores. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic device for casting sand cores to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic device for casting sand cores, comprising:

[0006] The top plate has guide columns fixed around one side wall, and a movable plate is slidably mounted on the guide columns. A second forming mold is provided on one side wall of the movable plate, and an ejection hole is provided on the inner side of the second forming mold.

[0007] A hydraulic cylinder is fixed to the other side of the top plate, and the output end of the hydraulic cylinder passes through the top plate and cooperates with the movable plate;

[0008] The first molding die is fixed to one end of the guide post by a mounting plate;

[0009] A top rod is provided in the middle of one side wall of the top plate, and one end of the top rod is provided with an elastic component that cooperates with the top plate;

[0010] The guide block is fixed to the other side wall of the moving plate and corresponds to the ejection hole. It guides the ejector rod when the sand core is ejected.

[0011] Preferably, one end of the elastic component is fixed with a connecting plate, and the inner side of the connecting plate is provided with bolts that cooperate with the top plate.

[0012] Preferably, the elastic component includes a spring and an arc-shaped plate, with a spring fixed to one end of the top rod, and the arc-shaped plate disposed at one end of the outer surface of the top rod, and the arc-shaped plate corresponding to the spring.

[0013] Preferably, the arc-shaped plate is arc-shaped, and the arc-shaped plate is symmetrically provided in at least two places along the top rod.

[0014] Preferably, an air blowing mechanism is provided at the upper end of the outer surface of the ejector pin, and the air blowing mechanism blows air to clean the inside of the second molding die during ejection.

[0015] Preferably, the air blowing mechanism includes an air hole, an air inlet pipe, and a hose. An air hole is provided on the outer surface of the top rod, and a rubber air nozzle is provided inside the air hole. The air inlet pipe is fixed to the other side wall of the top plate, and a hose communicating with the inside of the top rod is provided on one side wall of the air inlet pipe.

[0016] Preferably, the cross-section of the air hole is inclined, and multiple air holes are evenly distributed along the circumference of the top rod.

[0017] Preferably, one end of the push rod is connected to an anti-wear block via a threaded portion, and the anti-wear block has the same inner diameter as the push hole.

[0018] Preferably, a ventilation hole is provided on the inner side of the guide post, and a heat-conducting plate is fixed on the inner side of the ventilation hole.

[0019] Preferably, the guide block is trumpet-shaped, and the end of the guide block facing away from the ejector hole has the largest opening.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) By setting springs, arc plates and guide blocks, the connection between the top rod and the top plate is prevented from being broken or damaged when the top rod and the ejection hole are not aligned. This device facilitates the top rod to be guided by the guide block when ejecting the sand core, and can move adaptively with the position of the ejection hole, which can improve the alignment effect and reduce the risk of top rod breakage.

[0022] (2) By providing air holes, air inlets and hoses, the need for manual air blowing to clean the inside of the second molding mold after ejection is avoided. This device can automatically blow air, which improves the ease of operation. Moreover, since the air is blown from the bottom of the second molding mold to the opening, it can better blow out the residual sand particles from the opening of the second molding mold, thus improving the cleaning effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2This is a schematic diagram of the push rod structure of the present invention;

[0025] Figure 3 This is a schematic cross-sectional view of the second molding die of the present invention;

[0026] Figure 4 This is a schematic diagram of the pore structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the elastic component structure of the present invention;

[0028] Figure 6 This is a schematic cross-sectional view of the push rod structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the heat-conducting plate structure of the present invention.

[0030] In the diagram: 1. Hydraulic cylinder; 2. Guide column; 23. Heat-conducting plate; 3. Top plate; 5. Moving plate; 6. First forming mold; 7. Elastic component; 71. Spring; 72. Arc plate; 8. Ejector rod; 81. Rubber nozzle; 82. Air hole; 83. Air inlet pipe; 84. Hose; 85. Anti-wear block; 9. Second forming mold; 10. Guide block; 11. Ejection hole; 12. Connecting plate. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1-7 The present invention provides a technical solution: a hydraulic device for casting sand cores, characterized in that it comprises:

[0033] The top plate 3 has guide posts 2 fixed around one side wall, and a movable plate 5 is slidably arranged on the guide posts 2. A second forming mold 9 is arranged on one side wall of the movable plate 5, and an ejection hole 11 is opened on the inner side of the second forming mold 9.

[0034] Hydraulic cylinder 1 is fixed on the other side of top plate 3, and the output end of hydraulic cylinder 1 passes through top plate 3 and cooperates with moving plate 5;

[0035] The first molding die 6 is fixed to one end of the guide post 2 by a mounting plate;

[0036] The ejector pin 8 is located in the middle of one side wall of the top plate 3, and one end of the ejector pin 8 is provided with an elastic component 7 that cooperates with the top plate 3. This allows the ejector pin 8 to move through the elastic component 7 when the second molding mold 9 moves unexpectedly, thus avoiding the ejector pin 8 being welded and fixed to the top plate 3, which could lead to breakage or damage at the connection.

[0037] The guide block 10 is fixed to the other side wall of the movable plate 5 and corresponds to the ejector hole 11. When ejecting the sand core, it guides the ejector rod 8 so that the ejector rod 8 can better extend into the inside of the ejector hole 11 and eject the sand core inside the second molding mold 9.

[0038] In this embodiment, preferably, one end of the elastic component 7 is fixed with a connecting plate 12, and the inner side of the connecting plate 12 is provided with bolts that cooperate with the top plate 3, so that the elastic component 7 can be connected and fixed to the top plate 3.

[0039] In this embodiment, preferably, the elastic component 7 includes a spring 71 and an arc plate 72. One end of the push rod 8 is fixed with the spring 71, so that one end of the push rod 8 can move with the second molding mold 9. The arc plate 72 is disposed at one end of the outer surface of the push rod 8, and the arc plate 72 corresponds to the spring 71, so as to keep the initial position of the push rod 8 from moving too much.

[0040] In this embodiment, preferably, the arc plate 72 is arc-shaped, and the arc plate 72 is symmetrically provided at least two times along the top rod 8, so as to better maintain the position of the top rod 8.

[0041] In this embodiment, preferably, an air blowing mechanism is provided at the upper end of the outer surface of the ejector rod 8. During ejection, the air blowing mechanism blows air to clean the inner side of the second molding mold 9, which facilitates air blowing to clean the inner side of the second molding mold 9 during or after ejection.

[0042] In this embodiment, preferably, the air blowing mechanism includes 81, air hole 82, air inlet pipe 83 and hose 84. The outer surface of the top rod 8 is provided with air hole 82, and a rubber air nozzle 81 is provided inside the air hole 82. The air inlet pipe 83 is fixed to the other side wall of the top plate 3, and a hose 84 communicating with the inside of the top rod 8 is provided on one side wall of the air inlet pipe 83, so that when the top rod 8 moves, the gas can still be well delivered to the inside of the top rod 8 and blown out through the air hole 82.

[0043] In this embodiment, preferably, the cross-section of the air hole 82 is inclined, which facilitates the better blowing of the sand mixture remaining inside the second molding mold 9 toward the opening of the second molding mold 9, and multiple air holes 82 are evenly distributed around the push rod 8.

[0044] In this embodiment, preferably, one end of the push rod 8 is connected to an anti-wear block 85 through a threaded part, and the anti-wear block 85 is equal to the inner diameter of the ejection hole 11, so that the one end of the push rod 8 can be maintained and replaced after the push rod 8 has been ejected for a long time.

[0045] In this embodiment, preferably, a ventilation hole is provided on the inner side of the guide post 2, and a heat-conducting plate 23 is fixed on the inner side of the ventilation hole. This helps to prevent the guide post 2 from generating heat due to friction, which would make it difficult for the heat to dissipate. This device can increase the contact area with natural wind, thereby improving the heat dissipation effect. In addition, the heat-conducting plate 23 can better support the guide post 2 and improve the strength of the guide post 2.

[0046] In this embodiment, preferably, the guide block 10 is trumpet-shaped, and the end of the guide block 10 facing away from the ejector hole 11 has the largest opening, so that the ejector rod 8 can better extend into the inside of the ejector hole 11 through the guide block 10.

[0047] The working principle and usage process of this invention: After the sand core is formed between the first forming mold 6 and the second forming mold 9, the output end of the hydraulic cylinder 1 drives the moving plate 5 to move, causing the moving plate 5 to separate the second forming mold 9 from the first forming mold 6. At this time, the anti-wear block 85 at one end of the push rod 8 approaches the guide block 10, and the guide block 10 guides the push rod 8. Since the push rod 8 and the top plate 3 are connected by the elastic component 7, the push rod 8 moves freely during the guiding process, avoiding welding between the push rod 8 and the top plate 3, which would cause the second forming mold 9 to be separated from the first forming mold 6. When displacement occurs, the connection between the ejector rod 8 and the top plate 3 breaks. The ejector rod 8 passes through the ejection hole 11 and ejects the formed sand core from the inside of the second molding mold 9. The rubber nozzle 81 can prevent the residual sand particles from entering the interior of the ejector rod 8 through the air hole 82. After ejection, the external high-pressure gas can enter the interior of the ejector rod 8 through the air inlet pipe 83 and the hose 84, and finally spray out into the interior of the second molding mold 9 through the air hole 82 to automatically blow air and clean the interior of the second molding mold 9, which improves the convenience of the device.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic device for casting sand cores, characterized in that, include: Top plate (3), guide posts (2) are fixed around one side wall of the top plate (3), and a movable plate (5) is slidably arranged on the guide posts (2). A second forming mold (9) is arranged on one side wall of the movable plate (5), and an ejection hole (11) is opened on the inner side of the second forming mold (9). A hydraulic cylinder (1) is fixed on the other side of the top plate (3), and the output end of the hydraulic cylinder (1) passes through the top plate (3) and cooperates with the movable plate (5); The first molding die (6) is fixed to one end of the guide post (2) by a mounting plate; A top rod (8) is provided in the middle of one side wall of the top plate (3), and one end of the top rod (8) is provided with an elastic component (7) that cooperates with the top plate (3). The guide block (10) is fixed to the other side wall of the movable plate (5) and corresponds to the ejection hole (11). When the sand core is ejected, it guides the ejector rod (8). The elastic component (7) includes a spring (71) and an arc plate (72). One end of the top rod (8) is fixed with the spring (71), and the arc plate (72) is disposed at one end of the outer surface of the top rod (8), and the arc plate (72) corresponds to the spring (71). The arc plate (72) is arc-shaped, and the arc plate (72) is symmetrically provided in at least two places along the top rod (8); An air blowing mechanism is provided on the upper end of the outer surface of the ejector rod (8). When ejecting, the air blowing mechanism blows air to clean the inside of the second molding mold (9). The air blowing mechanism includes a rubber nozzle (81), an air hole (82), an air inlet pipe (83), and a hose (84). The outer surface of the top rod (8) is provided with an air hole (82), and a rubber nozzle (81) is provided inside the air hole (82). The air inlet pipe (83) is fixed to the other side wall of the top plate (3), and a hose (84) connected to the inside of the top rod (8) is provided on one side wall of the air inlet pipe (83). The cross-section of the air hole (82) is inclined, and multiple air holes (82) are evenly distributed along the circumference of the top rod (8); One end of the push rod (8) is connected to an anti-wear block (85) via a threaded part, and the anti-wear block (85) has the same inner diameter as the push hole (11); The guide block (10) is trumpet-shaped, and the end of the guide block (10) facing away from the ejector hole (11) has the largest opening.

2. The hydraulic device for casting sand cores according to claim 1, characterized in that: One end of the elastic component (7) is fixed with a connecting plate (12), and the inner side of the connecting plate (12) is provided with bolts that cooperate with the top plate (3).

3. The hydraulic device for casting sand cores according to claim 1, characterized in that: The guide post (2) has a ventilation hole on its inner side, and a heat-conducting plate (23) is fixed inside the ventilation hole.

Images