CN109530613B - Application method of sand mixing device - Google Patents
Application method of sand mixing device Download PDFInfo
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- CN109530613B CN109530613B CN201811480235.XA CN201811480235A CN109530613B CN 109530613 B CN109530613 B CN 109530613B CN 201811480235 A CN201811480235 A CN 201811480235A CN 109530613 B CN109530613 B CN 109530613B
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- valve
- air
- sand
- sand mixing
- expansion tank
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
- B22C5/0472—Parts; Accessories; Controlling; Feeding; Discharging; Proportioning
Abstract
The application relates to a sand mixing device using method, which comprises a sand mixing machine, a feeding mechanism and an auxiliary material pressing and conveying device, wherein a sealing cover is arranged on the sand mixing machine, a feeding hopper is arranged above the sealing cover, an electronic weighing hopper is arranged above the feeding hopper, added sand enters a sand mixing chamber of the sand mixing machine after being weighed, a sand mixing machine breathing pipe communicated with the sand mixing chamber is arranged outside the sand mixing machine, the sand mixing device further comprises an expansion tank, the top of the expansion tank is provided with an expansion tank breathing port, one side of the middle lower part of the expansion tank is provided with an air suction dust removal pipe, the lower part of the expansion tank is provided with a communicating pipe communicated with the sand mixing machine breathing pipe, and the expansion tank breathing port is provided with an air suction valve; the exhaust dust removing pipe is internally provided with a variable air volume pneumatic air valve for changing the air volume flowing through the exhaust dust removing pipe. The characteristic that the electronic scale does not need to weigh when auxiliary materials are conveyed under pressure is utilized, and the dust removal air quantity is increased in a short time to meet the dust removal requirement when the auxiliary materials are conveyed under pressure; when the auxiliary materials are not conveyed under pressure, the dust removing system of the sand mixer returns to the conventional technical state, and the weighing accuracy of the electronic scale and the recycling of the auxiliary materials are ensured.
Description
Technical Field
The application relates to a use method of a sand mixing device.
Background
In the production of modern large-scale casting factories, batch-type efficient sand mixers are usually used, and under the condition of full sealing, the weighing and adding of main materials (used sand and new sand), the quantitative feeding and the quantitative adding of auxiliary materials (bentonite and coal dust) and the quantitative adding of water are generally completed, and the materials are mixed and ground according to a preset process, and finished molding sand is discharged for molding after the mixed and ground.
In the process of adding a sand mixer and mixing and grinding of main materials and auxiliary materials, dust-raising polluted air is inevitably generated, a dust removal system is required to extract the polluted air for treatment, but in the process of extracting dust-containing air, the dust-removing device mainly has 3 problems:
the high-efficiency sand mixer is totally enclosed, and negative pressure is necessarily generated in the sand mixer under the totally enclosed condition, and the negative pressure is unstable, so that the electronic scale is inaccurate in weighing; in this case, there is a contradiction that the suction and the negative pressure cause inaccurate weighing.
The compressed air is used for conveying auxiliary materials, so that a large amount of air is brought in, positive pressure in the sand mixer is caused, and a large amount of dust escapes; in this case, the air introduced by the forced air needs to be drawn out with a large air volume in a short time.
Large air quantity exhausting dust removal can cause extraction of a large amount of auxiliary materials, so that waste is caused; in this case, the auxiliary materials are recovered as much as possible.
Disclosure of Invention
Aiming at the problems, the application aims to provide a sand mixing device using method which has reasonable structure and can avoid waste caused by escape of a large amount of dust.
The technical scheme for realizing the application is as follows
The sand mixing device comprises a sand mixing machine, a feeding mechanism for adding sand into the sand mixing machine, an auxiliary material pressing and conveying device for adding auxiliary materials into the sand mixing machine, a sealing cover for covering a sand mixing chamber of the sand mixing machine, a hopper for adding sand into the sand mixing chamber, an electronic weighing hopper, a suction valve, a suction pipe and a sealing cover, wherein the hopper is fixedly arranged above the sealing cover; the exhaust dust removing pipe is provided with a variable air volume pneumatic air valve for changing the air volume flowing through the exhaust dust removing pipe.
Further, the feeding mechanism comprises a new sand feeding mechanism and an old sand feeding mechanism, wherein the new sand feeding mechanism is a screw conveyor, and the old sand feeding mechanism is a belt conveyor.
Further, the variable air volume pneumatic air valve comprises a valve body, a valve shaft assembled in the valve body, two ends of the valve shaft extend to the outside of the valve body, two ends of the valve shaft are respectively and rotatably installed on the valve body through bearings, a valve plate is fixedly installed on the valve shaft in the valve body, the valve plate is provided with a communicating part communicated with two sides of the valve plate, the outside of the valve body is connected with the valve shaft, the valve shaft is driven to rotate around a driving mechanism of the valve shaft, the driving mechanism comprises an air cylinder and a pushing block, an air inlet end and an air outlet end of the air cylinder are switched through an electromagnetic reversing valve, one end of the pushing block is fixedly connected with any end of the valve shaft outside the valve body, the other end of the pushing block is movably connected with a pushing rod of the air cylinder, when the air cylinder pushing rod extends out, the air valve is in an open state, and when the air cylinder pushing rod is retracted, the air valve is in a closed state.
Further, the communicating part is formed after the edge of the valve plate is cut or/and a through hole is formed on the valve plate.
Further, the opening area of the communicating part is not larger than half of the area of the valve plate.
Further, a loading plate which is arranged along the radial direction of the valve body is fixedly welded on the valve body, and a supporting plate which is fixedly welded along the axial direction of the valve body is fixedly welded between the supporting plate and the loading plate, two supports are fixedly arranged on the loading plate, a cylinder body of the cylinder is positioned between the two supports, a rotating shaft is fixedly arranged on the cylinder body of the cylinder, and two ends of the rotating shaft are respectively assembled between the two supports in a rotating mode.
By adopting the technical scheme, the breathing pipe is connected to the sand mixer, the other end of the breathing pipe is connected with the expansion tank through the connecting pipe, and the top of the expansion tank is directly connected with the atmosphere, so that the air pressure inside and outside the sand mixer is balanced; part of auxiliary material dust escaping into the expansion tank falls back into the sand mixer by self gravity, so that material waste is avoided; in order to prevent dust from escaping from the top of the expansion tank to pollute the environment, the lower part of the expansion tank is connected with an exhaust dust removal pipe for exhausting.
Aiming at the advantages and disadvantages of the existing dust removal technology of the sand mixer, the application skillfully utilizes the characteristic that the sand mixer is used for carrying out the auxiliary material pressing and the electronic scale weighing at different time in the sand mixing period, when the auxiliary material pressing and the auxiliary material feeding are carried out, the top air-breathing valve of the expansion tank is closed instantaneously, and meanwhile, the variable air volume pneumatic air valve is opened for carrying out the large air volume air draft, and the negative pressure is formed in the sand mixer so as to ensure that the air entering the sand mixer due to the auxiliary material pressing and feeding is discharged in time; after the pressure transmission is finished, the variable air volume pneumatic air valve is closed (namely, the large air volume is closed and the small air volume is started) for 2-5 seconds, and meanwhile, the air suction valve at the top of the expansion tank is opened, so that the internal and external pressure difference of the sand mixer is reset to zero, and the accuracy of the subsequent weighing of the electronic scale is ensured. The characteristic that the electronic scale does not need to weigh when the auxiliary materials are conveyed under pressure (about 5 seconds) is utilized, and the dedusting air quantity is increased in a short time to meet the dedusting requirement when the auxiliary materials are conveyed under pressure; when the auxiliary materials are not conveyed under pressure, the dust removing system of the sand mixer returns to the conventional technical state, and the weighing accuracy of the electronic scale and the recycling of the auxiliary materials are ensured.
Drawings
FIG. 1 is a schematic diagram of the structure of the present application;
FIG. 2 is a schematic structural view of a variable air volume pneumatic air valve in the application;
FIG. 3 is a left side schematic view of FIG. 2;
FIG. 4 is a schematic top view of FIG. 2;
FIG. 5 is a schematic view of a first embodiment of a valve plate;
FIG. 6 is a schematic view of a second embodiment of a valve plate;
in the drawings, 1 is a sand mixer, 2 is a new sand feeding mechanism, 3 is an old sand feeding mechanism, 4 is an auxiliary material pressing and conveying device, 5 is a sealing cover, 6 is a charging hopper, 7 is an electronic weighing hopper, 8 is a sand mixer breathing pipe, 9 is an expansion tank, 10 is an expansion tank breathing port, 11 is an exhaust dust removing pipe, 12 is a communicating pipe, 13 is a breathing air valve, 14 is a variable air volume pneumatic air valve, 15 is a valve shaft, 16 is a valve plate, 17 is an air cylinder, 18 is a pushing block, 19 is an electromagnetic directional valve, 20 is a loading plate, 21 is a supporting plate, 22 is a support, 23 is a rotating shaft, 24 is a fork-shaped connecting seat, 25 is a trimming edge, and 26 is a through hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present application fall within the protection scope of the present application.
As shown in fig. 1-6, a sand mixing device using method comprises a sand mixing machine 1, and a feeding mechanism for adding sand into the sand mixing machine, wherein the feeding mechanism comprises a new sand feeding mechanism 2 for adding new sand and an old sand feeding mechanism 3 for adding and recycling old sand, the new sand feeding mechanism is a screw conveyor, namely, a motor is adopted to drive a feeding screw rod to push the new sand for feeding, and the old sand feeding mechanism is a belt conveyor. And an auxiliary material pressing and conveying device 4 for adding auxiliary materials into the sand mixer, wherein an auxiliary material pressing and conveying tank is adopted, the auxiliary material pressing and conveying tank is provided with a feed inlet and a discharge outlet, and compressed air is input into the auxiliary material pressing and conveying tank to press and convey the auxiliary materials in the auxiliary material pressing and conveying tank out of the discharge outlet, so that the auxiliary materials enter a sand mixing cavity of the sand mixer.
The sand mixer is provided with a sealing cover 5 for covering a sand mixing chamber of the sand mixer so as to form a closed state, a hopper 6 for adding sand into the sand mixing chamber is fixedly arranged above the sealing cover, an electronic weighing hopper 7 is arranged above the hopper, an electronic scale is arranged in the electronic weighing hopper, the electronic weighing hopper adopts a structure of a common weighing hopper, sand added by a feeding mechanism passes through the weighing hopper and enters the sand mixing chamber of the sand mixer, the sand mixer is externally provided with a sand mixer breathing tube 8 communicated with the sand mixing chamber, the sand mixer further comprises an expansion tank 9, the top of the expansion tank is provided with an expansion tank breathing port 10, one side of the middle part of the expansion tank is provided with an air suction dust removing pipe 11, the lower part of the expansion tank is provided with a communicating pipe 12 communicated with the sand mixer breathing tube, a breathing valve 13 is assembled in the expansion tank breathing port, the breathing valve adopts a common air valve as long as the opening or closing function can be realized, or the same structure as a variable air valve is adopted, and the communication part is not arranged on a valve plate; the air-variable pneumatic air valve 14 for changing the air quantity flowing through the air-extracting dust-removing pipe is arranged at the mouth of the air-extracting dust-removing pipe.
The variable-air-volume pneumatic air valve comprises a valve body 27, a linear valve shaft 15 is assembled along the radial direction of the valve body, two ends of the valve shaft extend to the outside of the valve body, two ends of the valve shaft are respectively and rotatably installed on the valve body through bearings, a circular valve plate 16 is fixedly installed on the valve shaft in the valve body through bolts or bolts, the size of the valve plate is matched with that of a circular channel in the valve body, the valve plate is provided with a communicating part communicated with two sides of the valve plate, the outside of the valve body is connected with the valve shaft, a driving mechanism driving the valve shaft to rotate around the driving mechanism is driven by the driving mechanism, the driving mechanism comprises an air cylinder 17 and a pushing block 18, the air inlet end and the air outlet end of the air cylinder are switched through an electromagnetic reversing valve 19, one end of the pushing block is fixedly connected with any end of the valve shaft outside the valve body, the other end of the pushing block is movably connected with a pushing rod of the air cylinder, when the air cylinder pushing rod extends out, the air valve is in an open state, and when the air cylinder pushing rod is retracted, the air valve is in a closed state.
The loading plate 20 arranged along the radial direction of the valve body is welded and fixed on the valve body, the supporting plate 21 arranged along the axial direction of the valve body is welded and fixed vertically and welded and fixed between the supporting plate and the loading plate, the loading plate is fixedly connected with two supports 22 through bolts, the cylinder body of the air cylinder is positioned between the two supports, the cylinder body of the air cylinder is welded and fixed with a rotating shaft 23, and two ends of the rotating shaft are respectively assembled by rotating between the two supports (the rotating shaft is sleeved with a bearing or is perforated on the support, and the end part of the rotating shaft is directly inserted). The telescopic end of the air cylinder is connected with a fork-shaped connecting seat 24 in a threaded manner, and the pushing plate is inserted into the fork-shaped connecting seat and assembled through an inserted pin shaft so as to realize movable connection.
As shown in fig. 5, the communication part is formed after the edge of the valve plate is cut, that is, the upper and lower edges 25 of the valve plate of the air valve are cut, so that a gap is formed between the air valve and the inner wall of the housing of the valve body, so that the air supply passes through when the air valve is in a closed state.
As shown in fig. 6, the connection part may be a through hole 26 formed in the valve plate, and the shape, number and size of the through holes may be set according to need. But the opening area of the communicating part is not larger than half of the area of the valve plate so as to avoid the air valve in a closed state and the passing air quantity is overlarge. The valve plate is provided with a communicating part which is communicated with two sides of the valve plate, and when the valve plate of the air valve is fully opened, the valve plate is completely the same as a common ventilation valve and is in a large air volume state; when the air valve plate is closed, a part of air quantity can still pass through the communicating part on the air valve plate, and the air valve plate is in a small air quantity state. The size of the communication part can determine the size of the air quantity which can pass when the air valve is closed. The rotation of the valve shaft is driven by the expansion of the air cylinder controlled by the electromagnetic reversing valve, so that the valve is simple, economical and efficient. Compared with the variable air valve driven by the electric actuator with the same specification, the manufacturing and using cost of the variable air valve can be controlled below half (namely, 1/2).
In the application, an exhaust dust removal pipe is provided with a variable air volume pneumatic air valve, and the variable air volume pneumatic air valve has two working states: the full-open state is the maximum air volume state, the closed state is the small air volume state, and the air suction dust removing pipe is connected with the lower part of the expansion tank for air induction. A breathing air valve is arranged above the expansion tank and has two working states: the full-open state is the maximum air volume state, the closed state is the non-ventilation state, the full-open state is the direct-connection atmosphere at the top of the expansion tank, and the two electric air valves are automatically controlled to be opened and closed by the electric control PLC.
The following problems can be solved by the cooperation of the working modes among the auxiliary materials, the variable-air-volume pneumatic air valve and the breathing air valve:
1. because the pressing and conveying mode adds auxiliary materials, the auxiliary materials can directly enter the sand layer, so that the mixing and grinding efficiency of the sand mixer is improved, the mixing and grinding period is shortened, but the dust removal effect, the weighing accuracy and the auxiliary material recovery cannot be considered in the prior art.
2. If the forced feeding mode is used by force and auxiliary materials are added, the dust removal effect is good, the air quantity exhaust air is increased, the defects of inaccurate weighing of the electronic scale and waste of the auxiliary materials are overcome, the accurate weighing of the electronic scale is ensured, the auxiliary materials are not wasted, and the problem of dust pollution of a sand mixing work part even the whole workshop is overcome.
3. The large air quantity required for avoiding auxiliary material pressure delivery removes dust, influences the weighing of an electronic scale, and the auxiliary material is not added into the sand mixer by pressure delivery, so that the problem of low production efficiency of the sand mixer is caused.
Claims (3)
1. The application method of the sand mixing device comprises a sand mixing machine, a feeding mechanism for adding sand into the sand mixing machine, and an auxiliary material pressing and conveying device for adding auxiliary materials into the sand mixing machine, and is characterized in that a sealing cover for covering a sand mixing chamber of the sand mixing machine is arranged on the sand mixing machine, a feeding hopper for adding sand into the sand mixing chamber is fixedly arranged above the sealing cover, an electronic weighing hopper is arranged above the feeding hopper, the sand added by the feeding mechanism is weighed by the electronic weighing hopper, enters the sand mixing chamber of the sand mixing machine through the feeding hopper, a sand mixing breathing pipe communicated with the sand mixing chamber is arranged outside the sand mixing machine,
the device also comprises an expansion tank, wherein the top of the expansion tank is provided with an expansion tank breathing port, one side of the middle lower part of the expansion tank is provided with an exhaust dust removal pipe, the lower part of the expansion tank is provided with a communicating pipe communicated with the breathing pipe of the sand mixer, and the expansion tank breathing port is provided with an exhaust valve; a variable air volume pneumatic air valve for changing the air volume flowing through the air draft dust removal pipe is arranged in the air draft dust removal pipe orifice;
the variable-air-volume pneumatic air valve comprises a valve body, a valve shaft assembled in the valve body, two ends of the valve shaft extend to the outside of the valve body, two ends of the valve shaft are respectively and rotatably installed on the valve body through bearings, a valve plate is fixedly installed on the valve shaft in the valve body, the valve plate is provided with a communicating part communicated with two sides of the valve plate, the outside of the valve body is connected with the valve shaft, a driving mechanism for driving the valve shaft to rotate around the valve shaft is connected with the outside of the valve body, the driving mechanism comprises an air cylinder and a pushing block, the air inlet end and the air outlet end of the air cylinder are switched through an electromagnetic reversing valve, one end of the pushing block is fixedly connected with any end of the valve shaft outside the valve body, the other end of the pushing block is movably connected with a pushing rod of the air cylinder, when the pushing rod of the air cylinder extends out, the air valve is in an open state, and when the pushing rod of the air cylinder is retracted, the air valve is in a closed state, namely, the air valve is closed to a large air volume and a small air volume is started;
the communicating part is formed after the edge of the valve plate is cut or/and a through hole is formed on the valve plate;
the opening area of the communicating part is not more than half of the area of the valve plate;
the auxiliary material pressing and conveying device adopts an auxiliary material pressing and conveying tank which is provided with a feed inlet and a discharge outlet, and the auxiliary materials in the auxiliary material pressing and conveying tank are pressed and conveyed out from the discharge outlet into a sand mixing chamber of the sand mixer by inputting compressed air into the auxiliary material pressing and conveying tank;
when auxiliary materials are conveyed under pressure, the breathing valve at the top of the expansion tank is closed instantaneously, and meanwhile, the variable air volume pneumatic air valve is opened for exhausting air with large air volume, so that negative pressure is formed in the sand mixer, and the air entering the sand mixer due to auxiliary materials conveyed under pressure is discharged in time; after the forced air delivery is completed, the variable air volume pneumatic air valve is closed after 2-5 seconds, namely, the large air volume is closed, the small air volume is started, and meanwhile, the top air-breathing valve of the expansion tank is opened, so that the internal and external pressure difference of the sand mixer is reset to zero.
2. A method of using a sand mixing device as defined in claim 1 wherein the feeding mechanism comprises a new sand feeding mechanism and an old sand feeding mechanism, the new sand feeding mechanism being a screw conveyor, the old sand feeding mechanism being a belt conveyor.
3. The method of claim 1, wherein a loading plate arranged along the radial direction of the valve body and a supporting plate arranged along the axial direction of the valve body are welded and fixed on the valve body, two supports are vertically and welded and fixed between the supporting plate and the loading plate, a cylinder body of the cylinder is positioned between the two supports, a rotating shaft is fixedly arranged on the cylinder body of the cylinder, and two ends of the rotating shaft are respectively assembled between the two supports in a rotating manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811480235.XA CN109530613B (en) | 2018-12-05 | 2018-12-05 | Application method of sand mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811480235.XA CN109530613B (en) | 2018-12-05 | 2018-12-05 | Application method of sand mixing device |
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| Publication Number | Publication Date |
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| CN109530613A CN109530613A (en) | 2019-03-29 |
| CN109530613B true CN109530613B (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811480235.XA Active CN109530613B (en) | 2018-12-05 | 2018-12-05 | Application method of sand mixing device |
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| CN109530613A (en) | 2019-03-29 |
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