JP6477711B2 - Foundry sand processing equipment - Google Patents

Description

  The present invention relates to a foundry sand treatment facility. More specifically, the present invention relates to a foundry sand treatment facility after the frame is released after casting and the casting is taken out.

  Conventionally, casting sand is mold-molded and unframed (unmolded) after casting, the casting is taken out, and then sand-treated to be used again for mold molding (for example, JP (See Sho 59-229255). Looking at conventional sand treatment equipment, it had various functions before kneading, such as a magnetic separator to remove iron pieces, a rough sieve to remove sand blocks, a sand cooler to cool sand, and a hopper to store sand after cooling. In general, simple substances are arranged at appropriate intervals in the order of processes.

  However, the conventional sand treatment facility also requires a single sand transport device (for example, a belt conveyor or a bucket elevator) having the respective functions, and the sand treatment facility as a whole requires a large installation volume. There was a problem. Along with this, there is a problem that the equipment cost becomes high.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a foundry sand treatment facility capable of reducing the facility volume and reducing the facility cost as the entire sand treatment facility.

In order to achieve the above object, the foundry sand treatment facility according to the first aspect of the present invention is a foundry sand treatment facility that disassembles the frame after casting and further processes the foundry sand after the casting is taken out. A hopper divided by a dividing wall into a first chamber for receiving the foundry sand after the casting has been taken out and a second chamber for storing the foundry sand received in the first chamber, and an interior of the first chamber. It is disposed and the sand lump of the foundry sand thrown into the first chamber is pulverized, and the foundry sand after pulverized sand lump is radiated to the second chamber from the opening provided in the dividing wall. A sand radiating device to be supplied; an air inlet for introducing air into the second chamber; and a suction port for sucking air introduced from the air inlet from the second chamber. Before being stored in the second chamber and disposed in the lower portion of the second chamber Comprising a first conveyor for conveying the molding sand, wherein the sand emitting device includes a comb toothed endless belt which emits toward the molding sand is charged into the first chamber to said second chamber, said comb teeth A solid material of a predetermined size or more, which is disposed above the endless belt with a comb and is conveyed by the endless belt with a comb, collides, crushes a lump of sand, or pushes back the solid material from the sand radiating device. A first sieve disposed below the sand radiating device in the first chamber; a first chute disposed outside the first sieve; and the first sieve. A second chute having a lower end opened on the first conveyor, and among the foundry sand falling from the sand radiating device, the foundry sand that has passed through the first sieve is Carried on the first conveyor through the second chute Is, the foundry sand that has fallen without passing through the first sieve and recovering as foreign through the first chute.

  According to the foundry sand treatment facility, the foundry sand after the frame is opened after casting and the cast is further taken out is supplied to the second chamber from the opening provided in the dividing wall by the sand radiating device. At this time, the sand lump formed by agglomeration of the foundry sands contained in the foundry sand is pulverized by the sand radiating device. Further, air passes from the air introduction port toward the suction port. The foundry sand supplied from the opening to the second chamber comes into contact with the air passing from the air inlet to the suction port, and the foundry sand is cooled. The cooled foundry sand is stored in the second chamber. And the foundry sand stored in the second chamber is conveyed to the subsequent process by the first conveyor. According to this configuration, the functions of sand lump crushing, sand cooling, and sand storage can be satisfied with one facility, and the facility volume can be reduced. Moreover, the foundry sand stored in the second chamber can be conveyed by the first conveyor.

Further, according to the foundry sand treatment facility, the sand mass is crushed by the sand radiating device, and the solid matter that is not crushed is not supplied to the second chamber but falls from the sand radiating device and is collected as foreign matter. Can do.

Further, according to the foundry sand treatment facility, the foundry sand that has not been supplied to the second chamber by the sand radiating device is put into the first sieve disposed below the sand radiating device. Here, foundry sand smaller than the opening of the first sieve passes through the first sieve and is conveyed by the first conveyor via the second chute. On the other hand, sand lump that could not be crushed by core glass, iron pieces or sand radiating device (hereinafter referred to as “core glass, etc.”), which is larger than the opening of the first sieve, must pass through the first sieve. It falls without being collected and is collected in a collection container such as a container as a foreign substance through the first chute. According to this configuration, the foreign matter contained in the foundry sand that has not been supplied to the second chamber by the sand radiating device can be efficiently recovered, and the eye that has not been supplied to the second chamber by the sand radiating device. Fine foundry sand can be conveyed by the first conveyor.

The foundry sand treatment facility according to the second aspect of the present invention is characterized by comprising first vibration means for vibrating the first sieve. According to this structure, since the 1st sieve vibrates with the 1st vibration means, while being able to perform sieving with a foundry sand and a foreign material efficiently, clogging of the 1st sieve can be prevented. Furthermore, it is easy to convey the foreign matter on the first sieve downstream.

The foundry sand treatment facility according to the third aspect of the present invention is disposed so as to surround the front end portion of the first conveyor, and the lower portion is formed at the fork of the first discharge chute and the second discharge chute. The third chute and the third chute are disposed below the front end portion of the first conveyor so as to be rotatable, and the first discharge chute side or the second discharge chute side by being rotated. And a second conveyor disposed below the first discharge chute, and the first discharge chute side of the foundry sand thrown in from the first conveyor Foundry sand that has passed through the second sieve located at the second conveyor is conveyed by the second conveyor via the first discharge chute and remains without passing through the second sieve located on the first discharge chute side. Rotate the second sieve with sand And recovering as foreign through the second discharge chute by Rukoto.

  According to the foundry sand treatment facility, the foundry sand conveyed by the first conveyor is put into the second sieve in the third chute from the front end of the first conveyor in the conveying direction. At this time, the dust is danced by the impact of the casting sand thrown into the second sieve, but the tip of the first conveyor is surrounded by the third chute, preventing the dust from diffusing out of the third chute. To do. Of the foundry sand thrown into the second sieve, foundry sand smaller than the opening of the second sieve passes through the second sieve and is conveyed by the second conveyor via the first discharge chute. On the other hand, those larger than the opening of the second sieve, such as the core glass, do not pass through the second sieve and remain as foreign substances. Further, the foreign matter remaining on the second sieve passes through the second discharge chute by rotating the second sieve toward the second discharge chute after completion of the transfer of the foundry sand by the first conveyor. The foreign matter is collected in a collection container such as a container connected to the second discharge chute. According to this configuration, the foreign matter that has not been completely collected by the first sieve can be efficiently collected, and the foundry sand can be conveyed to a subsequent process.

The foundry sand treatment facility according to the fourth aspect of the present invention is characterized in that it comprises second vibration means for vibrating the second sieve. According to this structure, since the 2nd sieve vibrates with the 2nd vibration means, while being able to perform sieving with a foundry sand and a foreign material efficiently, clogging of a 2nd sieve can be prevented.

In the foundry sand treatment facility according to the fifth aspect of the present invention, the first conveyor is a belt conveyor, and the tip of the first conveyor is a magnet pulley.

  According to the foundry sand treatment facility, the iron pieces contained in the foundry sand conveyed by the first conveyor are adsorbed at the tip of the first conveyor by the magnetic force generated by the magnet pulley. When the magnet pulley further rotates and the first conveyor advances, the magnetic force of the magnet pulley with respect to the iron piece decreases, so the iron piece separates from the magnet pulley and falls, and passes through the second discharge chute as a foreign object to the container or the like. Collected. According to this structure, the iron piece contained in the foundry sand conveyed by the first conveyor can be efficiently removed.

The foundry sand treatment facility according to a sixth aspect of the present invention is characterized by including a sand loading conveyor for loading the foundry sand into the first chamber. According to this configuration, the foundry sand that has been unframed after casting and further taken out of the cast can be continuously fed into the first chamber by the sand throwing conveyor.

The foundry sand treatment facility according to the seventh aspect of the present invention is the sand temperature measuring means for measuring the temperature of the foundry sand transported by the sand feeding conveyor, and the casting whose temperature is measured by the sand temperature measuring means. And watering means for watering the sand.

  According to the foundry sand treatment facility, the temperature of the foundry sand is measured by the sand temperature measuring means after being unloaded after casting and after the casting is taken out. After that, based on the measured foundry sand temperature, water is sprayed in an amount necessary for cooling the foundry sand. According to this structure, the amount of water required for cooling the foundry sand can be accurately sprayed onto the foundry sand.

In the foundry sand treatment facility according to the eighth aspect of the present invention, the suction port is connected to a dust collector, and suction from the suction port is performed by the dust collector. According to this configuration, air can be passed from the air inlet to the suction port with a simple structure and efficiently, and dust generated in the hopper can be collected by the dust collector.

In the foundry sand treatment facility according to the ninth aspect of the present invention, air introduced into the second chamber from the air introduction port by the suction from the suction port is radiated from the sand radiating device to the second chamber. The sand is in contact with the foundry sand, and the flow direction of the air introduced from the air introduction port into the second chamber by the suction from the suction port is radiated from the sand radiating device to the second chamber. The direction is a direction opposite to the radial direction of the foundry sand. According to this configuration, the foundry sand radiated from the sand radiating device to the second chamber can be efficiently cooled by the air introduced from the air inlet to the second chamber by suction from the suction port.

  ADVANTAGE OF THE INVENTION According to this invention, the sand processing equipment as a whole can provide the foundry sand processing equipment which can make equipment volume small and can reduce equipment cost.

This application is based on Japanese Patent Application No. 2014-174669 filed on August 29, 2014 and Japanese Patent Application No. 2015-0630384 filed on March 24, 2015 in Japan. A part of it is formed.
The present invention will also be more fully understood from the following detailed description. However, the detailed description and specific examples are preferred embodiments of the present invention and are described for illustrative purposes only. This is because various changes and modifications will be apparent to those skilled in the art from this detailed description.
The applicant does not intend to contribute any of the described embodiments to the public, and the disclosed modifications and alternatives that may not be included in the scope of the claims are equivalent. It is part of the invention under discussion.
In this specification or in the claims, the use of nouns and similar directives should be interpreted to include both the singular and the plural unless specifically stated otherwise or clearly denied by context. The use of any examples or exemplary terms provided herein (eg, “etc.”) is merely intended to facilitate the description of the invention and is not specifically recited in the claims. As long as it does not limit the scope of the present invention.

It is a partial cross section front view which shows the structure of the foundry sand processing equipment in one Embodiment. It is a partial cross section left view which shows the structure of the foundry sand processing equipment in one Embodiment, and is sectional drawing of the left part of FIG. It is a front view which shows the structure of the sand radiation apparatus in one Embodiment. It is a left view which shows the structure of the sand radiation apparatus in one Embodiment. It is a schematic diagram which shows the flow direction of the fluid air in one Embodiment, and the radiation direction of the foundry sand radiated | emitted from a sand radiation apparatus.

  An example of an embodiment of the foundry sand treatment facility of the present invention will be described with reference to the accompanying drawings. In the following description, the vertical and horizontal directions refer to the directions in the drawings unless otherwise specified. In addition, this invention is not restricted to the structure of this embodiment, It can change suitably as needed.

  As shown in FIG.1 and FIG.2, the hopper 1 is the cross-sectional side view (FIG. 2). A reduced portion 1-2 that is connected and has a cross-sectional area that decreases in the downward direction. The lower end of the reduced portion 1-2 is open. Further, as shown in FIG. 1, a dividing wall 8 provided with an opening 9 is provided inside the hopper 1 perpendicular to the bottom surface, and the hopper 1 is divided into a first chamber 1a and a second chamber 1b.

  As shown in FIG. 1, a suction port 10 is connected to the partition wall 8 side on the upper surface of the second chamber 1b. The suction port 10 is connected to a dust collector (not shown) that generates suction force. Further, an air introduction port 11 for introducing air into the second chamber 1b is connected to the side surface of the second chamber 1b opposite to the dividing wall 8 in communication.

  A first conveyor 12 is disposed below the lower ends of the first chamber 1a and the second chamber 1b. In the present embodiment, a belt conveyor constituted by a first front pulley 12a, a first rear pulley 12b, and a first belt 12c is disposed as the first conveyor 12. The first belt 12c is stretched between the first front pulley 12a and the first rear pulley 12b. The first front pulley 12a is provided with a V belt (not shown) and a V pulley (not shown). A first conveyor drive motor (not shown) is rotatably disposed. By driving the first conveyor drive motor, the first belt 12c rotates in the transport direction (clockwise in FIG. 1). Furthermore, the width of the first conveyor 12 is such that the casting sand put in from the first chamber 1a and the second chamber 1b in the hopper 1 is efficiently conveyed, so that the opening width h at the lower end of the reduced portion 1-2 shown in FIG. It is set to the same level or widely.

  The first chamber 1a in the hopper 1 is provided with a gantry 1c as shown in FIGS. 1 and 2, and the sand radiating device 2 is installed on the gantry 1c. The sand radiating device 2 is a device that radiates sand by rotating an endless belt 22 with comb teeth. Note that “radiating sand” means releasing sand diagonally upward or horizontally. As shown in FIG. 3, the endless belt 22 with comb teeth in the sand radiating device 2 is stretched between a sand radiating front pulley 23 and a sand radiating rear pulley 24. The sand radiating front pulley 23 has a V belt 25a. And the sand radiation motor 25 is rotatably arranged via the V pulleys 25b and 25c. By driving the sand radiation motor 25, the comb-toothed endless belt 22 rotates in the conveying direction (clockwise in FIG. 3). As shown in FIG. 3, the comb-toothed endless belt 22 has a plurality of comb teeth 22 a formed in parallel at intervals in the transport direction and the belt width direction. The comb teeth 22a are preferably 10 mm to 30 mm in length and 1 mm to 15 mm in thickness. The interval at which the comb-toothed endless belt 22 is attached in the conveying direction is preferably 20 mm or more and 50 mm or less. The comb teeth 22a are preferably arranged at intervals of 5 mm to 50 mm in the width direction. Furthermore, in this embodiment, the sand radiation front pulley 23 is disposed above the sand radiation rear pulley 24, and the comb-toothed endless belt 22 is disposed to be inclined with respect to the horizontal plane. With this configuration, the sand radiating device 2 can radiate foundry sand obliquely upward. A constant space above the comb-toothed endless belt 22 is provided so as to be covered by the surrounding chute 26.

  As shown in FIGS. 3 and 4, a rotating shaft 27 a is disposed above the sand radiation front pulley 23 in the surrounding chute 26. A plurality of gate plates 27 aligned in the width direction of the endless belt 22 with comb teeth are provided so as to be rotatable about a rotation shaft 27a. Further, one end of each of the plurality of springs 28 is fixed to the upper end portion of each of the plurality of gate plates 27, and the other end of each of the plurality of springs 28 is located downstream of the gate plate 27 in the surrounding chute 26 (right side in FIG. 3). Are fixed respectively. Due to the spring 28 and the rotating shaft 27a, the comb-toothed endless belt 22 and the gate plate 27 have a right-angle relationship. In the present embodiment, the surrounding chute 26 has a stopper shaft (not shown) provided so that the conveying direction of the comb-toothed endless belt 22 and the gate plate 27 are perpendicular to each other. Further, a gap is secured between the lower end of each gate plate 27 and the tip of the comb teeth 22a, and the size of this gap is preferably 3 mm or more and 10 mm or less. In the present embodiment, the size of the gap between the lower end of the gate plate 27 and the tip of the comb tooth 22a is set to 5 mm.

  As shown in FIG. 3, a rotary shaft 29a is disposed above the sand radiating rear pulley 24 in the surrounding chute 26, and a plate member 29 is provided to be rotatable about the rotary shaft 29a. In this embodiment, the rotation direction of the plate member 29 is the sand radiation front pulley 23 side, and the rotation angle is up to about 90 degrees. In the present embodiment, a stopper shaft (not shown) is provided so that the conveyance direction of the comb-toothed endless belt 22 and the plate member 29 are in a right angle relationship. Further, a gap is secured between the lower end portion of the plate member 29 and the tip of the comb teeth 22a of the endless belt 22 with comb teeth, and the size of the gap is preferably 3 mm or more and 10 mm or less. In the present embodiment, the size of the gap between the lower end of the plate member 29 and the tip of the comb teeth 22a is set to 5 mm.

  As shown in FIG. 3, a sand radiation guide 30 that is plate-shaped and can be rotated on an extension line in the conveyance direction of the comb-toothed endless belt 22, at the front end of the comb-toothed endless belt 22. It is arranged. With the sand radiation guide 30, the radiation angle of the foundry sand radiated from the sand radiation device 2 can be adjusted.

  An opening 18 is provided on the left side surface of the hopper 1 shown in FIG. Further, the sand throwing conveyor 19 is arranged so that the sand throwing belt 19b goes from the outside of the hopper 1 into the first chamber 1a in the hopper 1 and the leading end in the transport direction is above the endless belt 22 with comb teeth. It is arranged. In the present embodiment, as the sand throwing conveyor 19, a sand throwing front pulley 19a disposed above the sand radiating device 2, a sand throwing rear pulley (not shown) disposed outside the hopper 1, and sand throwing A belt conveyor constituted by a sand throwing belt 19b stretched between the front pulley 19a and the sand throwing rear pulley is disposed. Further, a sand throwing conveyor drive motor (not shown) is rotatably disposed on the sand throwing front pulley 19a via a V belt (not shown) and a V pulley (not shown). By driving the sand throwing conveyor drive motor, the sand throwing conveyor 19 rotates in the transport direction (clockwise in FIG. 1).

  As shown in FIG. 1, the sand throwing conveyor 19 includes a sand temperature measuring means 20 for measuring the temperature of the foundry sand conveyed by the sand throwing conveyor 19, and a foundry sand whose temperature has been measured by the sand temperature measuring means 20. Watering means 21 for spraying water is disposed. In the present embodiment, a thermocouple is disposed on the sand loading conveyor 19 as the sand temperature measuring means 20. As the sand temperature measuring means 20, a known thermometer such as a resistance thermometer or a non-contact thermometer can be used. Further, a nozzle that can spray water into the foundry sand as a shower is disposed on the sand injection conveyor 19 as the water spray means 21. As the water spray means 21, a known device such as a device for spraying water can be used. Further, between the sand temperature measuring means 20 and the watering means 21, as shown in FIG. 1, an operation for determining the watering amount by the watering means 21 based on the sand temperature measured by the sand temperature measuring means 20. Means 20a is connected. As the calculation means 20a, a known device having a calculation function such as an IC, a PLC, or a personal computer can be used.

  A mountain-shaped first sieve 3 is disposed below the sand radiating device 2 in the first chamber 1a as shown in FIG. The first sieve 3 is configured in a mesh shape, and the width of the opening in the inclination direction is preferably 15 mm or more and 35 mm or less, and the width of the opening in the direction perpendicular to the inclination is 3 mm or more and 10 mm or less. It is preferable to do. About the 1st sieve 3 of this embodiment, the width | variety of the opening of an inclination direction is 25 mm, and the width | variety of the opening of an inclination and a perpendicular direction is 5 mm. Moreover, 45 degrees or more and 60 degrees or less are suitable for the inclination | tilt angle (alpha) of the 1st sieve 3 with respect to a horizontal surface. If the inclination angle α is smaller than 45 degrees, the foreign matter thrown in from the sand radiating device 2 remains on the first sieve 3, and if the inclination angle α is larger than 60 degrees, the foreign matter and foundry sand are first. The first chute 3 passes through the first chute 5 without being sieved by the sieve 3 and is collected in the foreign matter collecting container 7. In the present embodiment, the inclination angle α is 45 degrees.

  The first sieve 3 may be provided with first vibration means 4 as shown in FIG. In the present embodiment, the first vibrating means 4 has a plate member (on the surface opposite to the sand radiating device 2 and a plate member) so that the foreign matter and casting sand introduced from the sand radiating device 2 do not collide with the first vibrating means 4. It is arranged on the first sieve 3 via a not-shown). Further, as the first vibration means 4, various means such as an eccentric motor or an air vibration cylinder that generates vibration by a cylinder by inputting air can be used. In the present embodiment, an eccentric motor is used as the first vibrating means 4. When the first vibrating means 4 is disposed on the first sieve 3, the inclination angle α of the first sieve 3 is preferably 15 degrees or more and 60 degrees or less.

  As shown in FIG. 2, the first chutes 5 are respectively arranged from the two lower ends of the mountain-shaped first sieve 3 toward the foreign matter collection container 7. In the present embodiment, the first chute 5 is connected to the reduced portion 5a whose width decreases downward from the lower end of the first sieve 3 and the lower end of the reduced portion 5a, and the conduit portion 5b having the same width downward. And is composed of. The second chute 6 in the first chamber 1 a is disposed below the first sieve 3 and between the pair of first chutes 5. The lower end of the second chute 6 opens on the first conveyor 12.

  The first front pulley 12 a (the front end portion of the first conveyor 12) in the first conveyor 12 is surrounded by the third chute 13. The third chute 13 is provided with an opening 13c, and the first belt 12c is disposed so as to pass through the opening 13c. In addition, the first discharge chute 13a and the second discharge chute 13b are opened at the lower portion of the third chute 13 and are bifurcated. The foundry sand and the like conveyed to the first conveyor 12 usually falls into the opening of the first discharge chute 13a. The first discharge chute 13 a is opened toward the second conveyor 16, and the second discharge chute 13 b is opened toward the foreign material collection container 17.

  As shown in FIG. 1, a rotation means 14a is provided between the first discharge chute 13a and the second discharge chute 13b, and the first discharge chute is rotated by the rotation means 14a. A second sieve 14 is disposed on the 13a side or the second discharge chute 13b side. The rotating means 14a rotates the second sieve 14 between the first discharge chute 13a side and the second discharge chute 13b side by, for example, a motor and a gear train. The rotating means 14a may rotate the second sieve 14 with a known device such as a motor and a cam, or hydraulic pressure, an air cylinder, a rack and a gear. Moreover, the 2nd sieve 14 is comprised by mesh shape, and the magnitude | size of an opening is suitable 3 mm or more and 10 mm or less. About the 2nd sieve 14 of this embodiment, the magnitude | size of an opening is 5 mm. Further, the second sieve 14 is disposed below the first front pulley 12a.

  The second sieve 14 may be provided with second vibration means 15. In the present embodiment, as shown in FIG. 1, the second vibrating means 15 is disposed at the tip of a bar member 14b provided in the rotating means 14a. Further, as the second vibration means 15, various means such as an eccentric motor and an air vibration cylinder that generates vibration by the cylinder by inputting air can be used. In the present embodiment, an eccentric motor is used as the second vibrating means 15.

  Next, an example of the sand processing method by the foundry sand processing apparatus of this embodiment is demonstrated with reference to an accompanying drawing.

  The first conveyor drive motor, the sand radiation motor 25, and the sand loading conveyor drive motor are driven. At the same time, the dust collector is operated to allow air to pass from the air inlet 11 to the suction port 10. Further, the sand throwing conveyor 19 is unframed after casting and further carrying the foundry sand after taking out the casting from the previous process. The foundry sand transported by the sand throwing conveyor 19 is not only foundry sand, Contains sand lump formed by agglomeration of core glass, iron pieces and foundry sand. Hereinafter, it is also referred to as “cast sand”.

  The amount (weight) of foundry sand and the like conveyed from the previous process is made almost constant per unit area of the sand loading conveyor 19. The temperature of the foundry sand or the like (open frame sand temperature T1) conveyed by the sand throwing conveyor 19 is measured by the foundry sand coming into contact with a thermocouple as the sand temperature measuring means 20. The measured unframed sand temperature T1 is transmitted to the computing means 20a. The specific heat of the foundry sand, the latent heat of water evaporation, and the temperature of the foundry sand in the second chamber 1b (cooling sand temperature T2) that are arbitrarily set are input in advance to the computing means 20a. The amount of water to be sprinkled per unit area in the sand loading conveyor 19 necessary for lowering the temperature of the foundry sand from the unsealed sand temperature T1 to the cooled sand temperature T2 is calculated by the calculating means 20a. It is calculated by comparing with the latent heat of vaporization. Then, based on the calculated watering amount, water is sprayed from the watering means 21 toward the foundry sand or the like.

  The combless endless belt 22 in the sand radiating device 2 is rotating, and the cast sand or the like sprinkled with water is fed from the sand throwing conveyor 19. Foundry sand or the like thrown into the sand radiating device 2 enters between the plurality of comb teeth 22a, passes between the gate plate 27 and the endless belt 22 with comb teeth, and is radiated toward the second chamber 1b. Also, the sand lump contained in the foundry sand and the like charged into the sand radiating device 2 is crushed by the rotating comb teeth 22a while colliding with the gate plate 27 to be in a sand state. It passes between the toothed endless belts 22 and radiates toward the second chamber 1b. On the other hand, the core dust and the like contained in the foundry sand and the like put into the sand radiating device 2 is a foreign substance, and the sand collides with the gate plate 27 while maintaining the rotation speed of the endless belt 22 with comb teeth. It is bounced out of the surrounding chute 26 in the radiation device 2 and falls onto the first sieve 3.

  The rotational speed of the comb-toothed endless belt 22 is preferably 2 m / s to 12 m / s. If the rotational speed of the comb-toothed endless belt 22 is slower than 2 m / s, the foundry sand cannot be emitted toward the second chamber 1b. Further, if the rotational speed of the endless belt 22 with comb teeth is faster than 12 m / s, the V belt 25a, the endless belt 22 with comb teeth, the sand radiating front pulley 23, and the sand radiating rear pulley 24 are consumed quickly. Deterioration due to collision with foundry sand and foreign matter is accelerated. In the present embodiment, the rotational speed of the endless belt 22 with comb teeth is 7 m / s.

  The core dust and the like remaining in the sand radiating device 2 without falling on the first sieve 3 remain on the comb-toothed endless belt 22 with the sand radiating motor 25 stopped. The core glass or the like can be dropped onto the first sieve 3 by rotating the plate member 29 about the rotation shaft 29a.

  When the core glass or the like is caught between the lower end portion of the gate plate 27 and the comb teeth 22a, the core plate or the like rotates the gate plate 27 while extending the spring 28 fixed to the upper end portion of the gate plate 27. It is made to move, passing through the gap between the comb teeth 22a and the lower end of the gate plate 27, and radiated toward the second chamber 1b. The core dust and the like emitted here are collected in the foreign material collection container 17 through the second sieve 14 described later.

  The foundry sand radiated from the sand radiating device 2 enters the second chamber 1b through the opening 9, and is stored there. Here, the casting sand comes into contact with the air passing from the air inlet 11 toward the suction port 10 until it is radiated by the sand radiating device 2 and stored in the second chamber 1b. In addition to the exchange, the water adhering to the foundry sand evaporates and is cooled to the cooling sand temperature T2. Moreover, the dust that rises when the foundry sand comes into contact with air is collected by a dust collector.

  The foundry sand stored in the second chamber 1b can impart an aging effect by providing moisture. Here, aging refers to bentonite that is contained in the foundry sand as a caking additive and is stored by giving moisture to bentonite that has been dehydrated by the heat of the molten metal during casting and has reduced caking strength. It means that water is permeated again to restore caking power. In the present embodiment, the moisture applied to the foundry sand is water sprayed by the sprinkling means 21 and water that has not been evaporated from the foundry sand radiated by the sand projecting device 2. When the foundry sand stored in the second chamber 1b is aged, the water for aging the foundry sand is added to the water required for cooling the foundry sand in the watering means 21 described above. Also good. Here, it is also possible to stop the first conveyor 12 in order to extend the time for aging the foundry sand.

  The foreign matter removed from the sand radiating device 2 falls toward the first sieve 3. Of the foreign matter that has fallen on the first sieve 3, the foundry sand that adheres to the foreign matter and passes through the first sieve 3 smaller than the opening of the first sieve 3 is sent to the second chute 6 and stored. . On the other hand, the foreign matter that is larger than the opening of the first sieve 3 and cannot pass through the first sieve 3 falls and is sent from the first sieve 3 to the first chute 5 and passes through the reduced portion 5a and the conduit portion 5b in the first chute 5. Then, it is recovered into the foreign material recovery container 7. With these configurations, the foreign matter removed from the sand radiating device 2 can be efficiently separated into the foreign matter and the foundry sand adhering to the foreign matter.

  When the foreign matter falls from the sand radiating device 2 toward the first sieve 3, the first sieve 3 may be vibrated by the first vibrating means 4. The amplitude and frequency of the first vibration means 4 can be changed according to the situation. The vibration of the first sieve 3 can prevent clogging of the first sieve 3. Moreover, since the foreign matter on the 1st sieve 3 can be easily sent below by the vibration of the 1st sieve 3, the inclination angle of the 1st sieve 3 can be made small.

  Foundry sand or the like stored in the second chute 6 is conveyed by rotating the first belt 12c in the first conveyor 12, passes between the dividing wall 8 and the first belt 12c, and passes through the second chamber 1b. It is conveyed to. Moreover, the foundry sand stored in the second chamber 1b is conveyed by rotating the first belt 12c in the first conveyor 12, and between the right side surface of the hopper 1 and the first belt 12c shown in FIG. Is passed through the second chute 14 disposed in the third chute 13. At this time, the dust is danced by the impact of the casting sand thrown into the second sieve 14, but since the tip of the first conveyor 12 is surrounded by the third chute 13, the dust diffuses out of the third chute 13. Never do.

  Of the foundry sand and the like charged into the second sieve 14, the foundry sand that passes through the second sieve 14 smaller than the opening of the second sieve 14 passes through the first discharge chute 13a and onto the second conveyor 16. Fall. Since the second conveyor 16 is rotating toward the post-processing device (not shown), the foundry sand is conveyed to the post-processing device. On the other hand, the foreign matter that is larger than the opening of the second sieve 14 and cannot pass through the second sieve 14 remains on the second sieve 14. The foreign matter remaining on the second sieve 14 passes through the second discharge chute 13 b and is collected in the foreign matter collection container 17 by rotating the second sieve 14. With these configurations, the foundry sand and the like put on the second sieve 14 can be efficiently separated into foundry sand and foreign matters. Here, the post-processing apparatus includes, for example, a kneading apparatus that supplies caking material such as bentonite or water to the foundry sand and then kneads the foundry sand.

  When casting sand or the like falls from the first conveyor 12 toward the second sieve 14, the second sieve 14 may be vibrated by the second vibrating means 15. The amplitude and frequency of the second vibration means 15 can be changed according to the situation. The clogging of the second sieve 14 can be prevented by the vibration of the second sieve 14.

  In the present embodiment, the first front pulley 12a may be a magnet pulley. According to this structure, the fine iron piece in the foundry sand etc. currently conveyed by the 1st conveyor 12 is adsorb | sucked by the magnetic force of a magnet pulley via the 1st belt 12c. When the first belt 12c is further rotated, the iron piece is separated from the magnet pulley, so that the attracting force due to the magnetic force is reduced, and is separated from the magnet pulley, passes through the second discharge chute 13b, and is collected in the foreign material collection container. With these configurations, fine iron pieces that cannot be separated by the first sieve 3 and the second sieve 14 can also be efficiently removed.

  In the present embodiment, the chevron-shaped first sieve 3 is disposed, but the shape of the first sieve 3 is not limited to the chevron. For example, you may arrange | position the 1st sieve 3 which consists of one inclined surface under the sand radiation | emission apparatus 2. FIG. In this case, the first chute 5 is arranged from one lower end of the first sieve 3 formed of one inclined surface toward the foreign material recovery container 7.

  Next, the characteristics of the flow direction of air introduced from the air inlet port 11 into the second chamber 1b by suction from the suction port 10 and the radial direction of foundry sand radiated from the sand radiating device 2 to the second chamber 1b. It will be described below.

  In this embodiment, as shown in FIG. 1, the suction port 10 is connected in communication with the side of the dividing wall 8 on the upper surface of the second chamber 1 b, and the side surface of the air introducing port 11 opposite to the dividing wall 8 in the second chamber 1 b. It is connected in communication. Moreover, the sand radiating device 2 is installed in the first chamber 1a. Therefore, as shown in FIG. 5, the flow direction of the air (hereinafter referred to as fluid air) introduced from the air introduction port 11 to the second chamber 1 b by suction from the suction port 10 is the second from the sand radiating device 2. It becomes a direction opposite to the radial direction of the foundry sand radiated to the chamber 1b. Note that the “opposite direction” means that in FIG. 1, air flows from right to left and casting sand is radiated from left to right. That is, the angle of each movement direction projected on the horizontal plane is in the range of 90 ° (right angle direction) to 180 ° (directly opposite direction).

  When the flowing air comes into contact with the foundry sand radiated from the sand radiating device 2, heat transfer from the foundry sand radiated from the sand radiating device 2 to the flowing air occurs. Furthermore, moisture contained in the foundry sand evaporates. Therefore, the foundry sand radiated from the sand radiating device 2 is cooled. According to this embodiment, since the flowing air and the foundry sand radiated from the sand radiating device 2 are in contact with each other while moving in the opposite direction, the heat from the foundry sand radiated from the sand radiating device 2 to the flowing air. The movement becomes efficient. Moreover, water tends to evaporate from the foundry sand.

  In the present embodiment, a dust collector is connected to the suction port 10 to suck air introduced from the air introduction port 11 into the second chamber 1b. Therefore, compared with the case where the dust collector is not connected to the suction port 10, the flow speed of the fluidized air is increased. That is, the frequency of discharging the air in the second chamber 1b heated by the contact with the casting sand radiated from the sand radiating device 2 from the suction port 10 is increased, and the room temperature air outside the second chamber 1b is air. The frequency of taking in into the 2nd chamber 1b from the inlet 11 becomes high. Therefore, the temperature of the air in the second chamber 1b and the flowing air can always be kept near the temperature outside the second chamber 1b. Since the temperature of the air in the second chamber 1b and the temperature of the flowing air can always be kept near the temperature outside the second chamber 1b, heat exchange between the foundry sand radiated from the sand radiating device 2 and the air can be performed efficiently. Can do. Moreover, since the temperature of the air in the second chamber 1b and the flowing air can always be kept near the humidity outside the second chamber 1b, the moisture from the foundry sand can be efficiently evaporated.

  In addition, as shown in FIG. 5, you may arrange | position the adjustment board 50 located so that the flow direction of flowing air may be adjusted in the 2nd chamber 1b as needed. The adjustment plate 50 can adjust the flow direction of the flowing air and cool the foundry sand radiated from the sand radiating device 2 efficiently.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. It is.

The main symbols used in the present specification and drawings are collectively shown below.
DESCRIPTION OF SYMBOLS 1 Hopper 1a 1st chamber 1b 2nd chamber 1c Mount 1-1 Direct trunk | drum 1-2 Reduction part 2 Sand radiation device 3 First sieve 4 First vibration means 5 First chute 5a Reduction part 5b Conduit part 6 Second chute 7 Foreign object collection container 8 Partition wall 9 Opening portion 10 Suction port 11 Air introduction port 12 First conveyor 12a First front pulley (magnet pulley)
12b 1st rear pulley 12c 1st belt 13 3rd chute 13a 1st discharge chute 13b 2nd discharge chute 13c opening part 14 2nd sieve 14a turning means 14b rod member 15 2nd vibration means 16 2nd conveyor 17 foreign material collection container 18 Opening 19 Sand input conveyor 19a Sand input front pulley 19b Sand input belt 20 Sand temperature measuring means 20a Calculation means 21 Sprinkling means 22 Endless belt with comb teeth 22a Comb teeth 23 Sand radiation front pulley 24 Sand radiation rear pulley 25 Sand radiation motor 25a V Belt 25b V pulley 25c V pulley 26 Surrounding chute 27 Gate plate 27a Rotating shaft 28 Spring 29 Plate member 29a Rotating shaft 30 Sand radiation guide 50 Adjustment plate

Claims (9)

A casting sand processing facility that disassembles the frame after casting and further processes the foundry sand after the casting is taken out.
A hopper divided by a dividing wall into a first chamber for receiving the foundry sand after taking out the foundry and a second chamber for storing the foundry sand received in the first chamber;
An opening provided in the dividing wall, disposed inside the first chamber and pulverizing the sand lump of the foundry sand charged into the first chamber, and radiating the foundry sand after pulverizing the lump. A sand radiating device for supplying the second chamber to the second chamber;
An air inlet connected to the second chamber for introducing air into the second chamber, and a suction port for sucking air introduced from the air inlet from the second chamber;
A first conveyor that is disposed in a lower portion of the second chamber and conveys the foundry sand stored in the second chamber ;
The sand radiator is
An endless belt with comb teeth that radiates the foundry sand thrown into the first chamber toward the second chamber;
A solid material of a predetermined size or more, which is disposed above the comb-toothed endless belt and is conveyed by the comb-toothed endless belt, collides, crushes a lump of sand, or pushes the solid material back to the sand. A gate plate that is dropped from the radiation device,
A first sieve disposed below the sand radiator in the first chamber;
A first chute disposed outside the first sieve;
A second chute disposed below the first sieve and having a lower end opened on the first conveyor;
Of the foundry sand falling from the sand radiating device, the foundry sand that has passed through the first sieve is transported by the first conveyor via the second chute and dropped without passing through the first sieve. The sand is collected as foreign matter through the first chute . 2. The foundry sand treatment facility according to claim 1 , further comprising first vibration means for vibrating the first sieve. A third chute formed so as to surround the front end of the first conveyor, and a lower portion of the first conveyer and the second discharge chute,
The second chute is disposed below the front end of the first conveyor in the third chute so as to be rotatable and is located on the first discharge chute side or the second discharge chute side by being rotated. A sieve,
A second conveyor disposed below the first discharge chute;
With
Of the foundry sand charged from the first conveyor, the foundry sand that has passed through the second sieve located on the first discharge chute side is conveyed by the second conveyor via the first discharge chute, The foundry sand remaining without passing through the second sieve located on the first discharge chute side is recovered as foreign matter through the second discharge chute by rotating the second sieve. The foundry sand treatment facility according to claim 1 or 2 . 4. The foundry sand treatment facility according to claim 3 , further comprising second vibration means for vibrating the second sieve. The first conveyor is a belt conveyor,
5. The foundry sand treatment facility according to claim 4 , wherein the tip of the first conveyor is a magnet pulley. 6. A foundry sand treatment facility according to claim 5 , further comprising a sand loading conveyor for loading the foundry sand into the first chamber. Sand temperature measuring means for measuring the temperature of the foundry sand conveyed by the sand feeding conveyor;
Watering means for watering the foundry sand whose temperature is measured by the sand temperature measuring means;
The foundry sand treatment facility according to claim 6 . The suction port is connected in communication with a dust collector,
8. The foundry sand treatment facility according to claim 7 , wherein suction from the suction port is performed by the dust collector. Air introduced into the second chamber from the air inlet by suction from the suction port comes into contact with the foundry sand radiated from the sand radiating device to the second chamber,
The flow direction of the air introduced from the air inlet port into the second chamber by suction from the suction port is opposite to the radial direction of the foundry sand radiated from the sand radiating device to the second chamber. The foundry sand treatment facility according to claim 8 .

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