JP4420751B2 - Solidified foundry sand crushing and recycling equipment - Google Patents

Description

  The present invention relates to an apparatus for crushing and regenerating solidified sand that crushes and regenerates solidified sand such as a core used for casting.

  2. Description of the Related Art Conventionally, a core that has been formed and solidified by mixing a binder is set in a mold when a hollow product or the like is cast. After casting, the core in the cast product is impacted and crushed and discharged from the cast product. The solidified foundry sand discharged in this way has been generally discarded. However, since waste has become a social problem in recent years, lump cast sand discharged for reuse or burrs that have been scraped off, etc., are thrown into a vibrating body, and foreign objects such as burrs and castings There is one that separates sand and separates the foundry sand by further crushing and crushing the massive foundry sand by sandblasting (for example, Patent Document 1). In addition, the ceramic ball and the self-hardening foundry sand glass are collided by vibrating the container in which the ceramic balls and self-hardening foundry sand glass are put, and the self-hardening foundry sand glass is crushed into sand and crushed. In some cases, the foundry sand is discharged from a wire mesh and recovered (for example, Patent Document 2).

However, these devices require a vibrator, sand blast, vibrator and ceramic balls, which complicates the structure and increases the running cost, and also has the problem of grinding the foundry sand.
JP-A-5-15941 JP 2003-305535 A

  The problems to be solved are that casting sand having a predetermined particle diameter can be obtained in a short time, running cost can be reduced, and wear of the casting sand does not occur.

In the present invention, a large number of crushing projection members for crushing the solidified sand and the solidified sand are crushed on the inner surface of a polygonal rotating drum of a triangle or more that allows the solidified sand to flow intermittently. the body of the polygonal rotary drum provided with a plurality of scoop plates to drop after having scooped up to the height to obtain a falling rate which can, multi multiple slits being crushed discharged regeneration molding sand reaches a predetermined particle size According to a first aspect of the present invention, there is provided an apparatus for crushing and regenerating solidified sand formed in a direction perpendicular to the direction of rotation of the square rotary drum. According to the invention of claim 2, the solidified sand sand crushing and regenerating apparatus comprising a combination with a portion is the invention of claim 2, and in the invention of claim 2, the solidified sand sand crushing and regenerating apparatus has a serrated upper edge of the ridge. Invention, and from claim 1 According to another aspect of the present invention, the solidified sand crushing and regenerating apparatus provided with a slit width adjusting mechanism in the slit is defined as the fourth aspect of the present invention. In the first to fourth aspects of the present invention, According to a fifth aspect of the present invention, there is provided an apparatus for crushing and regenerating solidified sand, which is changed according to the number or the amount of solidified sand and the number of revolutions and the amount of rotation and amount of solidified sand.

The present invention can crush a large number of crushing projecting members for crushing the solidified sand and the solidified sand on the inner surface of the barrel of a polygonal rotating drum or more that allows the solidified sand to flow intermittently. the body of the polygonal rotary drum provided with a plurality of scoop plates to drop after having scooped up to the height to obtain a falling rate, the number of slits to be crushed discharged regeneration molding sand reaches a predetermined particle diameter polygonal By forming it in a direction perpendicular to the rotation direction of the rotating drum , the solidified sand undergoes intermittent flow and intermittent drop motion, and repeatedly collides with the crushing projection member in which the corners are formed. Therefore, the solidified foundry sand can be effectively crushed, and the foundry sand having a specified particle diameter can be sieved in a short time. Moreover, the casting sand is not crushed due to intermittent movement. Further, by making the direction orthogonal to the rotation direction, even if the foundry sand slightly larger than the width of the slit fits in the slit, it is pushed out by the flow of the solidified foundry sand and removed.
According to the second aspect of the present invention, when the crushing projection member is formed of a ridge or a combination of a ridge and a bolt head, a large number of corners are formed on the body of the polygonal rotary drum at a low cost with a simple structure. Can be formed.
Since the upper edge of the ridge is serrated as in claim 3, the corners can be increased without increasing the number of ridges, so that the solidified sand can be crushed effectively and inexpensively. Become.
According to the fourth aspect of the present invention, the slit width adjusting mechanism is provided in the slit, so that it can be sieved to foundry sand having a required particle size without replacing the polygonal rotary drum, and the slit of the long-term use can be obtained. Even if the gap widens due to wear, it can be easily corrected to the specified slit.
As in claim 5, the amount of overhang of the scooping plate is changed according to the rotational speed of the polygonal rotating drum or the input amount of the solid cast sand, or the rotational speed and input amount, so that the optimum drop energy for the solidified sand is obtained. Therefore, the solidified cast article is not crushed more finely than necessary.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2, reference numeral 1 denotes an apparatus main body. The apparatus main body 1 is a base 2, a polygonal rotary drum 3 or more that is rotatably supported on the base 2, and a sieve from the polygonal rotary drum 3. It consists of a chute 4 that receives reclaimed foundry sand that is separated and discharged and a drive mechanism 5 that rotationally drives the polygonal rotary drum 3.

  The polygonal rotary drum 3 has an octagonal body and is provided with a conical solid cast sand opening 3a on one side. A plurality of crushing projection members 6 are provided on the inner surface of the barrel portion of the polygonal rotating drum 3 to apply a shearing force to the solidified sand by the flow of the solidified sand. The crushing projecting member 6 is composed of a ridge 6 a such as a rib formed on the inner peripheral surface of the polygonal rotary drum 3, a mounting bolt, and the like. 16 ridges 6a are formed. Further, the upper edge of the ridge 6a may be linear, but if the sawtooth shape as shown in FIG. 4 is used, the corner portion is increased and the crushing effect of the solidified sand is further improved. The ridges 6a are arranged in a direction perpendicular to the rotation direction, but it is needless to say that the ridges 6a may be arranged in a lattice shape or in the rotation direction. Further, the ridge 6a having a serrated upper edge and the ridge 6a having an upper edge formed in a straight line are alternately arranged or randomly arranged to change the degree of crushing the solidified sand, and thereby aim. It can be adapted to the particle size of foundry sand.

  Two scooping plates 7 are provided on the inner surface of the polygonal rotating drum 3 at intervals of 180 degrees. The scooping plate 7 scoops up the solidified casting sand to the vicinity of the top of the polygonal rotary drum 3 and drops it onto the crushing projection member 6, and the solidified casting sand collides with the corners of the crushing projection member 6. Thus, the solidified foundry sand is crushed. Further, although the number of scooping plates 7 is two, the number is changed according to the diameter of the polygonal rotating drum 3. For example, if the polygonal rotating drum 3 has a double diameter, the solidified casting sand is crushed at a height of about 1/2 without having to scoop up the solidified sand to the top of the polygonal rotating drum 3. Since it can be set as the height which can obtain fall speed as much as possible, the scooping board 7 can be made into four sheets. Furthermore, the amount of overhang of the scooping plate should be changed according to the rotational speed of the polygonal rotating drum, the amount of solidified casting sand input, or the number of rotations and the amount of input, so that the optimum falling energy can be applied to the solidified casting sand. Therefore, the solidified foundry sand is prevented from being crushed more finely than necessary. This is because if too much solidified sand is scooped up, it will be tightened too much by weight, and a part of the solidified sand may remain without falling from the scooping plate 7. Moreover, it is because it becomes difficult for solidified casting sand to fall by the centrifugal force which arises with the rotational speed of the polygon rotating drum 3. FIG. In a preferred embodiment, the scooping plate 7 having different overhang amounts in the range of 150 mm to 200 mm is used.

  Reference numeral 8 denotes 16 slits formed in the body wall of the polygonal rotating drum 3, and the slits 8 have a 1 mm gap as shown in FIG. It is supposed to change. 2, 5, 6, and 7, the slit 8 is formed in a direction orthogonal to the rotation direction of the polygonal rotary drum 3. If this is formed in the same direction as the rotational direction, the casting sand slightly larger than the width of the slit 8 will move along the slit 8 when fitted into the slit 8 and may not easily come out of the slit 8 and may cause clogging. This is because, by making it perpendicular to the direction, even if the foundry sand slightly larger than the width of the slit 8 is fitted into the slit 8, it is pushed out by the flow of the solidified foundry sand and removed.

  10 is a width adjusting mechanism of the slit 8, and the width adjusting mechanism 10 has a long hole 12 larger than the slit 8 in the body wall of the polygonal rotating drum 3 as shown in FIG. As shown in FIG. 9, a slit is formed by interposing in the long hole 12 as shown in FIG. In some cases, a slit 8 is formed by disposing a substantially bowl-shaped slidable shielding plate 11 on which an insertion piece 11 a forming 8 is formed and bolting. By using the substantially bowl-shaped shielding plate 11 in which the insertion piece 11a is inserted into the long hole 12, the lower corner portion of the plate-shaped shielding plate 11 is worn in a short period of time by use, and the gap of the slit 8 is formed. Although it becomes enlarged and it becomes impossible to screen the foundry sand having a predetermined particle diameter, the insertion piece 11a is plate-like, so that the gap of the slit 8 is not enlarged over a long period of time. Moreover, the corner | angular parts, such as the bolt head which stops the shielding board 11 of the width adjustment mechanism 10, and the shielding board 11, act as the above-mentioned crushing protrusion member 6. FIG.

  The driving mechanism 5 of the polygonal rotating drum 3 includes a rotating shaft 5a attached to the other side of the polygonal rotating drum 3 so as to coincide with the rotation center, and a motor with a speed reducer that rotates the rotating shaft 5a via a chain transmission mechanism. 5b and four driven rollers 5c that receive the lower surface of the polygonal rotating drum 3. Reference numeral 15 denotes a bearing for the rotary shaft 5a.

  When the solidified cast sand mixed with solid cast sand or metal pieces is introduced from the charging opening 3a and the motor 5b with a speed reducer of the drive mechanism 5 is driven, the thus configured one is a polygonal rotary drum. 3 is rotated by the rotating shaft 5a. When the polygonal rotary drum 3 is rotated by the drive mechanism 5, the solidified casting sands flow intermittently following the octagonal body inner surface. During this intermittent flow, a shearing force is applied to the solidified casting sand by the linear or serrated ridges 6a of the crushing projection member 6, and crushing is performed.

  At the same time, as the polygonal rotating drum 3 rotates, the solidified cast sand that has been scooped up by the scooping plate 7 is scooped up to the top of the polygonal rotating drum 3 as shown in FIG. It will fall to the bottom. The solidified casting sand that has been scooped up to the top of the polygonal rotating drum 3 obtains a falling speed sufficient to be crushed and collides with the bottom portion on which the crushing projection member 6 is provided. The sand will be crushed.

  By rotating the polygonal rotating drum 3 in this manner, the solidified foundry sand is crushed more finely, and when the particle diameter becomes about 1 mm, it is discharged from the slit 8 having a width of 1 mm formed in the polygonal rotating drum 3. It will be. The discharged foundry sand having a particle diameter of 1 mm is received by the chute 4 as the recycled foundry sand and discharged. After sieving is completed in this way, the residue is discharged by opening a lid (not shown) of the polygonal rotary drum 3. When changing the particle size of the foundry sand to be sieved, the gap of the slit 8 can be adjusted by loosening the bolt of the width adjusting mechanism 10 and sliding the slidable shielding plate 11 as shown in FIGS. It ’s good.

  Two scooping plates 7 having a length of 150 to 200 mm are provided and a 1 mm slit 8 is formed in an octagonal outer shape with a diameter of 1000 mm and a length of 1000 mm. When 100 kg of solidified cast sand was charged and the polygonal rotary drum 3 was rotated at a rotation speed of 10 rpm, the results shown in the graphs of Table 1 and FIG. 10 were obtained. In other words, 97% sieving sand with a particle size of 1 mm is sieved by operating for 9 to 10 minutes. As shown in Table 1, about 80% of scouring sand is sieved and saturated. Therefore, even if sieving is performed over 4 to 5 minutes after that, effective sieving is not performed, so the sieving is completed in about 5 minutes and new solidified casting sands are added. It is most efficient to perform sieving by replacing solidified foundry sand in the polygonal rotating drum 3, and a large amount of foundry sand can be processed in a short time.

It is a partially cutaway side view showing a preferred embodiment of the present invention. It is a partially cutaway front view showing a preferred embodiment of the present invention. It is an expanded sectional view which shows the slit formed in the polygonal rotating drum used for preferable embodiment of this invention. It is a front view which shows the protrusion member for crushing which consists of a ridge which has the serrated upper edge used for preferable embodiment of this invention. It is a partially notched front view which shows the first rotation state of the polygonal rotation drum in preferable embodiment of this invention. It is a partially notched front view which shows the state which the polygon rotating drum in preferable embodiment of this invention rotated 45 degree | times. It is a partially notched front view which shows the state which the polygon rotating drum in preferable embodiment of this invention rotated 110 degree | times. It is an expanded sectional view which shows the adjustment mechanism of the slit width in preferable embodiment of this invention. It is an expanded sectional view which shows the other example of the adjustment mechanism of the slit width in preferable embodiment of this invention. It is a graph which shows the relationship between the amount of sieving and time in preferable embodiment of this invention.

Explanation of symbols

3 Polygonal rotating drum 6 Crushing projection member
6a ridge 7 scooping board 8 slit
10 Width adjustment mechanism

Claims (5)

A large number of crushing projection members for crushing the solidified casting sand and a falling speed at which the solidified sand can be crushed on the inner surface of the barrel of a polygonal rotating drum of triangle or more that allows the solidified casting sand to flow intermittently. A plurality of scooping plates that are scooped up and dropped to the height to be obtained are provided, and a number of slits for discharging the reclaimed foundry sand that has been crushed to a predetermined particle diameter are formed in the body of the polygonal rotating drum. An apparatus for crushing and regenerating solidified sand, which is formed in a direction orthogonal to the direction of rotation .   2. The solidified cast sand crushing and regenerating apparatus according to claim 1, wherein the crushing projecting member comprises a ridge or a combination of a ridge and a bolt head.   The crushing and regenerating apparatus for solidified foundry sand according to claim 2, wherein the upper edge of the ridge has a sawtooth shape.   4. The solidified cast sand crushing and regenerating apparatus according to claim 1, wherein a slit width adjusting mechanism is provided in the slit.   The solidified casting according to any one of claims 1 to 4, wherein the amount of overhang of the scooping plate is changed in accordance with the rotational speed of the polygonal rotating drum or the input amount of the solidified casting sand or the rotational speed and the input amount. Sand crushing and recycling equipment.

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