Upper sand shooting and extruding mechanism for molding machine

Abstract

The utility model discloses an upper sand shooting and extruding mechanism for a molding machine, which is characterized in that a sand shooting module is fixedly arranged on a supporting platform, and a sand feeding mechanism is arranged at the top of the sand shooting module; a movable platform is further arranged above the supporting platform, one end of a main air cylinder is fixed to the movable platform, the other end of the main air cylinder is fixed to the supporting platform, and the lower portion of the movable platform is fixedly connected with an upper pressing plate in the upper sand box. Sliding sleeves capable of being connected with the sliding rods are arranged on the periphery of the supporting platform, two or more guiding air cylinders are further arranged between the supporting platform and the movable platform, and the main air cylinder and the guiding air cylinders can be started at the same time to drive the movable platform to stably move up and down. Molding sand in the upper sand box is stably extruded through the multiple air cylinders, the compactness and uniformity of the molding sand can be ensured, and therefore the quality of castings is improved. The pressure of the upper pressing plate can be more uniform by adopting the multiple air cylinders, and the situation that the pressure is not uniform possibly due to a single air cylinder is avoided.

Description

Technical Field

[0001] The utility model relates to the field of molding machines, in particular to an upper sand shooting and extrusion mechanism for a molding machine. Background Art

[0002] Existing sand mold making machines usually use the method of shooting sand from the side of the upper flask. Shooting sand from the upper flask can make the sand mold denser, thereby improving the quality and surface finish of the casting. Shooting sand from the upper flask can make the sand mold more accurate, thereby improving the dimensional accuracy and shape accuracy of the casting. Shooting sand from the upper flask can realize automated production and improve production efficiency and production capacity. Shooting sand from the upper flask can ensure better repeatability of the sand mold, thereby improving the consistency and stability of the casting.

[0003] However, due to the small available space and limited load-bearing capacity on the upper sand box, and in order to ensure the quality of sand shooting, when the upper sand box is located directly above for sand shooting, the cylinder used to drive the upper pressure plate cannot be set in the center. If only one cylinder is set on one side, or the two cylinders are not running synchronously, it is easy to cause uneven force on the upper pressure plate and tilt, and then cause failure, which will greatly reduce production efficiency; at the same time, due to uneven pressure, the density of the produced sand mold is uneven in various places, which can easily lead to a decrease in the stability of the casting. Therefore, there is an urgent need for an upper sand shooting and extrusion mechanism that can meet the functions of upper sand shooting and smooth extrusion at the same time. Utility Model Content

[0004] In view of the above problems, the utility model aims to provide a sand shooting and extrusion mechanism for a molding machine which has stable operation and is easy to maintain.

[0005] To achieve the technical purpose, the solution of the utility model is: an upper sand shooting and extrusion mechanism for a molding machine, comprising a support platform arranged above an upper sand box, two symmetrically arranged main cylinders and a sand shooting module, the sand shooting module is fixedly mounted on the support platform, and a sand feeding mechanism is arranged on the top of the sand shooting module;

[0006] A movable platform is also provided above the supporting platform, one end of the main cylinder is fixed on the movable platform, and the other end of the main cylinder is fixed on the supporting platform;

[0007] The support platform is provided with sliding sleeves which can be connected with the sliding rods all around, and more than two guiding cylinders are arranged between the support platform and the movable platform. The main cylinder and the guiding cylinder can be started at the same time to drive the movable platform to move up and down smoothly.

[0008] Preferably, the sand shooting module is composed of a sand shooting cylinder, a boiling plate, an air guide channel, a connecting pipe and a pressurized air pump. The boiling plate is a porous structure with a mesh arranged in the sand shooting cylinder. The outer wall of the sand shooting cylinder is provided with a plurality of air guide channels, which are connected to the pressurized air pump and are also connected through a connecting pipe.

[0009] Preferably, guide sleeves are provided around the movable platform and at positions corresponding to the top of the sliding sleeve of the supporting platform. The guide sleeves are welded to the movable platform via a connecting plate, and the guide sleeves can be sleeved on the sliding rod.

[0010] Preferably, the middle part of the movable platform is a hollow structure, the sand shooting module is located in the middle part of the movable platform, the main cylinder is located on the left and right sides of the sand shooting module, the guide cylinder is located on the left and right sides of the sand shooting module, and the movable platform does not contact the sand shooting module during rising or falling.

[0011] Preferably, an L-shaped air guide tube is provided on one side of the top of the sand-shooting tube, and a pressure control valve is installed on the L-shaped air guide tube.

[0012] Preferably, the movable platform is a double-layer plate structure, and reinforcement plates are welded on both sides of the movable platform.

[0013] The beneficial effect of the utility model is that the present application can ensure the density and uniformity of the molding sand by smoothly squeezing the molding sand in the upper sand box through multiple cylinders, thereby improving the quality of the casting. The use of multiple cylinders can make the pressure of the upper pressure plate more uniform, avoiding the uneven pressure that may occur in a single cylinder. The downward pressing speed of the upper pressure plate can be adjusted by squeezing the control of the cylinder to meet different casting requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the utility model;

[0015] Figure 2 The three-dimensional Figure 1 ;

[0016] Figure 3 The three-dimensional Figure 2 ;

[0017] Figure 4 The three-dimensional Figure 3 ;

[0018] Figure 5 It is a schematic diagram of the structure of the utility model when viewed from above. DETAILED DESCRIPTION

[0019] The utility model of the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In order to clearly and completely describe the technical solution, the following embodiments are selected for illustration; based on the contents recorded in this application, other embodiments obtained without creative work are all within the scope of protection of this utility model.

[0020] In the following embodiments, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top / bottom" and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of clearly describing the present embodiment, rather than indicating or implying that the device or element referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0021] like Figure 1-5 As shown, the specific embodiment of the utility model is an upper sand shooting and extrusion mechanism for a molding machine, comprising a support platform 2 arranged above an upper sand box, wherein a sand shooting module 4 is fixedly mounted on the support platform 2, and a sand feeding mechanism 5 for loading sand particles is arranged on the top of the sand shooting module 4;

[0022] A movable platform 6 is also installed above the supporting platform 2. One end of the two main cylinders 3 is fixed on the movable platform 6, and the other end of the two main cylinders 3 is fixed on the supporting platform 2. The lower part of the movable platform 6 is fixedly connected to the upper pressure plate in the upper sand box 1, and the supporting platform 2 and the movable platform 6 can be lifted and lowered smoothly.

[0023] Slide rods are arranged around the molding machine, and the sliding sleeves 201 at the four corners of the supporting platform 2 can be movably connected with the slide rods. More than two guide cylinders 1 are also arranged between the supporting platform 2 and the movable platform 6. The main cylinder 3 and the guide cylinder 1 can be started at the same time to drive the movable platform 6 to move smoothly up and down.

[0024] In order to allow the sand particles in the sand shooting module to fully boil and pressurize, the sand shooting module 4 is composed of a sand shooting tube 401, a boiling plate 402, an air guide channel 403, a connecting pipe 404 and a pressurized air pump. A boiling plate 402 with a porous structure with a mesh is arranged in the sand shooting tube 401, and at least two transversely arranged air guide channels 403 and at least three vertically arranged air guide channels 403 are installed on the outer wall of the sand shooting tube 401. The air guide channels 403 are connected to the pressurized air pump, and adjacent air guide channels 403 are connected and conducted through connecting pipes 404.

[0025] In order to facilitate the movable platform to rise and fall more smoothly, guide sleeves 601 are further arranged around the movable platform 6 and at positions corresponding to the top of the sliding sleeve 201 of the supporting platform 2. The guide sleeves 601 are welded to the movable platform 6 through a connecting plate 602, and the guide sleeves 601 can be sleeved on the sliding rod.

[0026] In order to allow the movable platform to perform stably lifting and lowering movements, the middle part of the movable platform 6 is a hollow structure, the sand shooting module 4 is located in the middle part of the movable platform 6, the main cylinder 3 is located on the left and right sides of the sand shooting module 4, and the guide cylinder 1 is located on the left and right sides of the sand shooting module 4. The movable platform 6 does not contact the sand shooting module 4 during the rising or falling process.

[0027] In order to facilitate the control of the pressure in the sand shooting tube, an L-shaped air duct 405 is provided on one side of the top of the sand shooting tube 401. A pressure control valve 406 is installed on the L-shaped air duct 405. The pressure value in the sand shooting tube can be checked through the pressure control valve. If the pressure exceeds the threshold, part of the gas is discharged through the L-shaped air duct.

[0028] In order to reduce the weight of the movable platform, the movable platform 6 is a double-layer plate structure, and reinforcing plates 603 are welded on both sides of the movable platform 6. The reinforcing plates can reduce the weight while ensuring the stability of the movable platform.

[0029] When in use, first lower the support platform to seal the middle and lower boxes; fill the upper sand box with sand through the sand shooting module, and then start the main cylinder and the guide cylinder to squeeze and move the upper platen downward at the same time. Multiple cylinders continue to work, slowly pressing the upper platen down until it contacts the sand on the upper part. When the upper platen contacts the molding sand, the main cylinder will continue to work and continue to press the upper platen down until the required pressure is reached. After reaching the required pressure, the main cylinder will maintain the pressure unchanged until the upper platen stops pressing down, and maintain the pressure for a period of time. Finally, the sand mold is completed, and the main cylinder and the guide cylinder drive the upper platen to slowly rise until it returns to its original position.

[0030] The present application uses multiple cylinders to steadily squeeze the molding sand in the upper sand box, which can ensure the density and uniformity of the molding sand, thereby improving the quality of the casting. The use of multiple cylinders can make the pressure of the upper pressure plate more uniform, avoiding the uneven pressure that may occur in a single cylinder. The downward pressure speed of the upper pressure plate can be adjusted by squeezing the cylinder to meet different casting requirements.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent substitutions and improvements made to the above embodiments based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. A sand-shooting and extrusion mechanism for a molding machine, characterized in that: It includes a support platform arranged above the upper sand box, two symmetrically arranged main cylinders and a sand shooting module, wherein the sand shooting module is fixedly mounted on the support platform, and a sand feeding mechanism is arranged on the top of the sand shooting module; A movable platform is also provided above the supporting platform, one end of the main cylinder is fixed on the movable platform, and the other end of the main cylinder is fixed on the supporting platform; The support platform is provided with sliding sleeves which can be connected with the sliding rods all around, and more than two guiding cylinders are arranged between the support platform and the movable platform. The main cylinder and the guiding cylinder can be started at the same time to drive the movable platform to move up and down smoothly.

2. The upper sand shooting and extrusion mechanism for a molding machine according to claim 1, characterized in that: The sand shooting module is composed of a sand shooting cylinder, a boiling plate, an air guide channel, a connecting pipe and a pressurized air pump. The boiling plate is a porous structure with a mesh arranged in the sand shooting cylinder. The outer wall of the sand shooting cylinder is provided with a plurality of air guide channels, which are connected to the pressurized air pump and are also connected through the connecting pipe.

3. The upper sand shooting and extrusion mechanism for a molding machine according to claim 1, characterized in that: Guide sleeves are also arranged around the movable platform and at positions corresponding to the upper part of the sliding sleeve of the supporting platform. The guide sleeves are welded to the movable platform through a connecting plate, and the guide sleeves can be sleeved on the sliding rod.

4. The upper sand shooting and extrusion mechanism for a molding machine according to claim 1, characterized in that: The middle part of the movable platform is a hollow structure, the sand shooting module is located in the middle part of the movable platform, the main cylinder is located on the left and right sides of the sand shooting module, the guide cylinder is located on the left and right sides of the sand shooting module, and the movable platform does not contact the sand shooting module during rising or falling.

5. The upper sand shooting and extrusion mechanism for a molding machine according to claim 2, characterized in that: An L-shaped air guide tube is also provided on one side of the top of the sand-shooting tube, and a pressure control valve is installed on the L-shaped air guide tube.

6. The upper sand shooting and extrusion mechanism for a molding machine according to claim 1, characterized in that: The movable platform is a double-layer plate structure, and reinforcement plates are welded on both sides of the movable platform.

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