A vacuum sand suction device for coating sand shell production

Abstract

The invention discloses a vacuum sand suction device for the production of coated sand shells, comprising a sand hopper, a cover plate fixed on the upper end of the sand hopper, the sand hopper and the cover plate forming a vacuum box, one or more fixed flanges fixed on the outer wall of the sand hopper, frames fixed on the fixed flanges respectively, the frames extending into the sand hopper, dust removal bags fixed on the frames, the fixed flanges respectively fixed to transition pipes, the transition pipes respectively connected to the dust removal bags, one end of the transition pipe is in a closed state, the other end of the transition pipe is fixedly connected to an interface of an automatic three-way ball valve, the other interface of the automatic three-way ball valve is fixed to the connecting flange, the connecting flange is connected to a vacuum pump through a vacuum pipeline, the remaining interface of the automatic three-way ball valve is connected to the atmosphere, a sand suction pipeline is fixed on the outer wall of the sand hopper, the sand suction pipeline is connected to the sand hopper, a sand falling pipeline is fixed at the lower end of the sand hopper, and the sand falling pipeline is connected to the sand hopper. The vacuum sand suction device for the production of coated sand shells liberates manpower and improves the working environment.

Description

Technical Field

[0001] The invention relates to a vacuum device, in particular to a vacuum sand suction device used for the production of coated sand shells. Background Art

[0002] The existing production of coated sand shells is still a traditional manual operation. When the coated sand falls into the sand frame, it completely buries the mold. Under the action of high temperature, the coated sand on the surface of the mold quickly solidifies and forms a hard shell. At the same time, the mold temperature will drop rapidly during the crusting process. The coated sand far away from the mold surface will not form a hard shell because it cannot get enough heat, and will form floating sand. During the sand shell molding process, workers hold compressed air guns to blow off the excess floating sand on the sand shell. This operation causes fine sand to fly, a lot of dust, and a bad working environment. Summary of the invention

[0003] The purpose of the present invention is to provide a vacuum sand suction device for the production of coated sand shells, which changes the sand blowing process into a sand suction process, liberates manpower and improves the working environment.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A vacuum sand suction device for coated sand shell production comprises a sand hopper, a cover plate is fixed on the upper end of the sand hopper, the sand hopper and the cover plate form a vacuum box, one or more fixing flanges are fixed on the outer wall of the sand hopper, a frame is fixed on the fixing flanges respectively, the frame extends into the sand hopper, a dust removal bag is fixed on the frame, the fixing flanges are respectively fixed to a transition pipe, the transition pipe is respectively connected to the dust removal bag, one end of the transition pipe is in a closed state, the other end of the transition pipe is fixedly connected to an interface of an automatic three-way ball valve, the other interface of the automatic three-way ball valve is fixed to a connecting flange, the connecting flange is connected to a vacuum pump through a vacuum pipe, the remaining interface of the automatic three-way ball valve is connected to the atmosphere, an electromagnetic valve is installed on the automatic three-way ball valve, a sand suction pipe is fixed on the outer wall of the sand hopper, the sand suction pipe is connected to the sand hopper, a sand falling pipe is fixed to the lower end of the sand hopper, and the sand falling pipe is connected to the sand hopper.

[0006] Preferably, sealing gaskets are provided between the cover plate and the sand hopper, between the fixed flange and the sand hopper, between the transition pipe and the fixed flange, and between the connecting flange and the vacuum pipe.

[0007] Preferably, the transition pipe is fixedly connected to the automatic three-way ball valve via an external thread joint.

[0008] Preferably, a control valve is installed on the falling sand pipeline.

[0009] Preferably, the sand suction pipe is connected to the sand suction frame.

[0010] Preferably, the lower end of the sand suction pipe is connected to a welding elbow through a pagoda joint, and the welding elbow is connected to the sand suction frame.

[0011] Preferably, the sand suction frame includes two symmetrically arranged straight steel pipes 1 and two symmetrically arranged straight steel pipes 2, the straight steel pipe 1 is vertically arranged with the straight steel pipe 2, the straight steel pipe 1 is connected with the straight steel pipe 2 through a bent steel pipe respectively, all the straight steel pipes 1, the straight steel pipe 2 and the bent steel pipe form a frame shape, the welding elbow is connected to one of the straight steel pipes 1, and one end of the straight steel pipe 1 and the straight steel pipe 2 is respectively fixed with one or more copper pipes.

[0012] Preferably, the sand absorption frame also includes a connecting steel pipe 1 fixed at the lower ends of straight steel pipe 1 and straight steel pipe 2, the connecting steel pipe 1 at the lower end of the straight steel pipe connected to the welding elbow is respectively connected with the sand absorption steel pipe 1, the straight steel pipe 2 and the connecting steel pipe 1 at the lower end of another straight steel pipe are respectively connected with the sand absorption steel pipe 2, the sand absorption steel pipe 2 below the straight steel pipe 2 is respectively connected with the sand absorption steel pipe 3 through the connecting steel pipe 2, the opposite ends of the sand absorption steel pipe 2 are respectively fixed with transverse steel pipes, the lower end of the transverse steel pipe is fixed to the vertical steel pipe, the two ends of the sand absorption steel pipe 1, the two ends of the sand absorption steel pipe 2, the two ends of the sand absorption steel pipe 3 and one end of the transverse steel pipe are respectively fixed with sealing plates, and the sealing plates, copper pipes, straight steel pipe 1, straight steel pipe 2, sand absorption steel pipe 1, sand absorption steel pipe 2 and sand absorption steel pipe 3 are respectively provided with sand absorption holes of different sizes.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1) The present invention changes the traditional sand blowing process into a sand suction process, forms a sand hopper into a vacuum box, and connects the vacuum box with a vacuum pump to achieve smooth sand suction. When the vacuum pump is disconnected, the vacuum box is instantly depressurized, and the vacuum box will not be subjected to negative pressure all the time. The present invention is practical and reliable in design, has low requirements on the structural strength and sealing of the vacuum box, liberates manpower, and improves the working environment.

[0015] 2) The sand suction frame has a special contour design, multiple sand suction holes, and a layout of sand suction holes that adapts to the airflow and a design of hole size, so that the floating sand can be cleaned up quickly and synchronously at multiple points, avoiding the floating sand from being softened or even crusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a vacuum sand suction device for producing coated sand shells in an embodiment of the present invention;

[0017] Figure 2 is a front view of a vacuum box in an embodiment of the present invention;

[0018] Figure 3 yes Figure 2 The cross-sectional view along the AA direction;

[0019] Figure 4 2 is a schematic diagram of the structure of the sand suction frame in an embodiment of the present invention;

[0020] In the figure, 1, sand bucket, 2, cover plate, 3, fixed flange, 4, frame, 5, dust bag, 6, transition pipe, 7, automatic three-way ball valve, 8, external thread joint, 9, connecting flange, 10, welding elbow, 11, solenoid valve, 12, sand suction pipe, 13, sand suction frame, 1301, straight steel pipe one, 1302, straight steel pipe two, 1303, bent steel pipe, 1304, copper pipe, 1305, connecting steel pipe one, 1306, sand suction steel pipe one, 1307, sand suction steel pipe two, 1308, connecting steel pipe two, 1309, sand suction steel pipe three, 1310, horizontal steel pipe, 1311, vertical steel pipe, 1312, sealing plate, 1313, sand suction hole, 14, sand falling pipe, 15, sealing gasket, 16, pagoda joint. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0022] See also Figure 1-4 As shown, a vacuum sand suction device for the production of coated sand shells comprises a sand hopper 1, a cover plate 2 is fixed on the upper end of the sand hopper 1, and the sand hopper 1 and the cover plate 2 form a vacuum box. More than one fixed flange 3 is fixed on the outer wall of the sand hopper 1, and a frame 4 is fixed on the fixed flange 3 respectively, and the frame 4 extends into the sand hopper 1, and a dust removal bag 5 is fixed on the frame 4. The fixed flanges 3 are respectively fixed to the transition pipe 6, so that the transition pipe 6 is connected to the dust removal bag 5 respectively. One end of the transition pipe 6 is in a closed state, and the other end of the transition pipe 6 is fixedly connected to an interface of the automatic three-way ball valve 7, and the transition pipe 6 is fixedly connected to the automatic three-way ball valve 7 through an external thread joint 8. Another interface of the automatic three-way ball valve 7 is fixed to the connecting flange 9, and the connecting flange 9 is connected to the vacuum pump through a vacuum pipeline. The remaining interface of the automatic three-way ball valve 7 is open and connected to the air. The automatic three-way ball valve 7 is installed with a solenoid valve 11, and the solenoid valve 11 is used to control the operation of the automatic three-way ball valve 7.

[0023] A sand suction pipe 12 is fixed on the outer wall of the sand hopper 1, and the sand suction pipe 12 is connected to the sand hopper 1, and the sand suction pipe 12 is connected to the sand suction frame 13. A sand falling pipe 14 is fixed at the lower end of the sand hopper 1, and the sand falling pipe 14 is connected to the sand hopper 1. A control valve is installed on the sand falling pipe 14, and the control valve can be a solenoid valve. By setting the sand falling channel 14, it is convenient to cover the mold surface with sand. Sealing gaskets 15 are provided between the cover plate 2 and the sand hopper 1, between the fixed flange 3 and the sand hopper 1, between the transition pipe 6 and the fixed flange 3, and between the connecting flange 9 and the vacuum pipe. The sealing gasket 15 can enhance the sealing of the vacuum box.

[0024] The lower end of the sand suction pipe 12 is connected to the welding elbow 10 through the pagoda joint 16, and the welding elbow 10 is connected to the sand suction frame 13. The sand suction frame 13 includes two symmetrically arranged straight steel pipes 1301 and two symmetrically arranged straight steel pipes 1302. The straight steel pipes 1301 and the straight steel pipes 1302 are vertically arranged. The straight steel pipes 1301 and the straight steel pipes 1302 are respectively connected to the straight steel pipes 1302 through the bent steel pipes 1303. All the straight steel pipes 1301 and the straight steel pipes 1302 are surrounded by the bent steel pipes 1303 to form a frame. The welding elbow 10 is connected to one of the straight steel pipes 1301. One end of the straight steel pipes 1301 and the straight steel pipes 1302 is respectively fixed with one or more copper pipes 1304, and the copper pipes 1304 are fixed on the inner wall of the sand suction frame. The sand absorption frame 13 also includes more than two connecting steel pipes 1305 respectively fixed at the lower ends of the straight steel pipe 1 1301 and the straight steel pipe 2 1302. The connecting steel pipe 1305 at the lower end of the straight steel pipe 1 1301 connected to the welding elbow 10 is respectively connected to the sand absorption steel pipe 1 1306. The sand absorption steel pipe 1 1306 is vertically arranged with the straight steel pipe 1 1301. The connecting steel pipe 1 1305 at the lower ends of the straight steel pipe 2 1302 and another straight steel pipe 1 1301 are respectively connected to the sand absorption steel pipe 2 1307. The sand absorption steel pipe 2 1307 is arranged parallel to the straight steel pipe 1 1301 and the straight steel pipe 2 1302 respectively above it. The sand absorption steel pipe 2 1307 below the straight steel pipe 2 1302 is respectively connected to the sand absorption steel pipe 3 1309 through the connecting steel pipe 2 1308. The opposite ends of the sand absorbing steel pipe 2 1307 are respectively fixed with transverse steel pipes 1310, and the transverse steel pipes 1310 are arranged vertically with the straight steel pipe 2 1302, and the lower ends of the transverse steel pipes 1310 are fixed with the vertical steel pipes 1311. The two ends of the sand absorbing steel pipe 1 1306, the two ends of the sand absorbing steel pipe 2 1307, the two ends of the sand absorbing steel pipe 3 1309, and one end of the transverse steel pipe 1310 are respectively fixed with sealing plates 1312, and the sealing plates 1312, the copper pipe 1304, the straight steel pipe 1 1301, the straight steel pipe 2 1302, the sand absorbing steel pipe 1 1306, the sand absorbing steel pipe 2 1307, and the sand absorbing steel pipe 3 1309 are respectively provided with sand absorbing holes 1313 of different sizes.

[0025] Working principle: First, the sand falling pipe 14 is closed through the control valve, so that the vacuum pump is in a normally open state, the automatic three-way ball valve 7 is in a normally closed state, the vacuum pipe is closed, and the vacuum box is connected to the atmosphere through an interface of the automatic three-way ball valve 7. The solenoid valve 11 works, so that the interface of the automatic three-way ball valve 7 connected to the atmosphere is closed and the interface connected to the vacuum pipe is opened, so that the vacuum pump is connected to the vacuum box through the vacuum pipe and the transition pipe 6. The air in the vacuum box is instantly discharged through the dust bag 5, the transition pipe 6, and the automatic three-way ball valve 7 to form a negative pressure. The sand suction pipe 12 is connected to the sand suction frame 13. Under the action of negative pressure, the floating sand enters the vacuum box through the sand suction hole 1313, the sand suction frame 13, and the sand suction pipe 12. Under the action of gravity, the sand falls to the bottom of the sand hopper 1 to achieve the sand suction function. Among them, the special profiling design of the sand suction frame 13, the design of multiple sand suction holes 1313, the layout of the sand suction holes 1313 adapted to the airflow and the design of the hole size enable the floating sand to be cleaned up synchronously and quickly at multiple points, thereby preventing the floating sand from being softened or even crusted.

[0026] After the sand suction is completed, the solenoid valve 11 works, causing the automatic three-way ball valve to close the connection between the vacuum box and the vacuum pump, and at the same time connect the connection between the vacuum box and the atmosphere, and the vacuum box is instantly depressurized. The air enters from the automatic three-way ball valve 7, passes through the external thread connector 8 and the transition pipe 6, and then back-blows the dust bag 5, achieving the effect of cleaning the dust bag.

[0027] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A vacuum sand suction device for the production of coated sand shells, characterized in that: It comprises a sand hopper, a cover plate is fixed on the upper end of the sand hopper, the sand hopper and the cover plate form a vacuum box, one or more fixing flanges are fixed on the outer wall of the sand hopper, skeletons are respectively fixed on the fixing flanges, the skeletons extend into the sand hopper, dust bags are sleeved and fixed on the skeleton, the fixing flanges are respectively fixed to transition pipes, the transition pipes are respectively communicated with dust bags, one end of the transition pipe is in a closed state, the other end of the transition pipe is fixedly connected to an interface of an automatic three-way ball valve, the other interface of the automatic three-way ball valve is fixed to the connecting flange, the connecting flange is connected to a vacuum pump through a vacuum pipe, the remaining interface of the automatic three-way ball valve is communicated with the atmosphere, an electromagnetic valve is installed on the automatic three-way ball valve, a sand suction pipe is fixed on the outer wall of the sand hopper, the sand suction pipe is communicated with the sand hopper, a sand falling pipe is fixed to the lower end of the sand hopper, the sand falling pipe is communicated with the sand hopper; The sand suction pipe is connected to the sand suction frame, the lower end of the sand suction pipe is connected to the welding elbow through a pagoda joint, the welding elbow is connected to the sand suction frame, the sand suction frame includes two symmetrically arranged straight steel pipes 1 and two symmetrically arranged straight steel pipes 2, the straight steel pipe 1 and the straight steel pipe 2 are vertically arranged, the straight steel pipe 1 is connected to the straight steel pipe 2 through a bent steel pipe, all the straight steel pipes 1, the straight steel pipe 2 and the bent steel pipe form a frame, the welding elbow is connected to one of the straight steel pipes 1, and one end of the straight steel pipe 1 and the straight steel pipe 2 is respectively fixed with one or more copper pipes; The sand absorption frame also includes a connecting steel pipe 1 fixed at the lower ends of the straight steel pipe 1 and the straight steel pipe 2, a connecting steel pipe 1 at a lower end of the straight steel pipe connected to the welding elbow is respectively communicated with the sand absorption steel pipe 1, the straight steel pipe 2 and the connecting steel pipe 1 at the lower end of another straight steel pipe are respectively communicated with the sand absorption steel pipe 2, the sand absorption steel pipe 2 below the straight steel pipe 2 is respectively communicated with the sand absorption steel pipe 3 through the connecting steel pipe 2, a transverse steel pipe is respectively fixed at the opposite end of the sand absorption steel pipe 2, the lower end of the transverse steel pipe is fixed to the vertical steel pipe, and sealing plates are respectively fixed at the two ends of the sand absorption steel pipe 1, the two ends of the sand absorption steel pipe 2, the two ends of the sand absorption steel pipe 3, and one end of the transverse steel pipe, and the sealing plates, copper pipes, straight steel pipe 1, straight steel pipe 2, sand absorption steel pipe 1, sand absorption steel pipe 2, and sand absorption steel pipe 3 are respectively provided with sand absorption holes of different sizes; Sealing gaskets are arranged between the cover plate and the sand hopper, between the fixed flange and the sand hopper, between the transition pipe and the fixed flange, and between the connecting flange and the vacuum pipeline.

2. A vacuum sand suction device for the production of coated sand shells according to claim 1, characterized in that: The transition pipe is fixedly connected to the automatic three-way ball valve via an external thread joint.

3. The vacuum sand suction device for the production of coated sand shells according to claim 1, characterized in that: A control valve is installed on the falling sand pipeline.

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