JPH0223263B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention separates the casting from the molding sand and cools it so that the molding sand can be reused. , consisting of a horizontal drum horizontally and rotatably supported by wheels, and at least two annular rolling surfaces disposed on the outer peripheral surface of the drum to engage with the supporting wheels on the base frame, and at least one annular rolling surface. The support wheel relates to an apparatus for processing sand molds containing castings, wherein the support wheels are arranged to be driven.

The present invention aims to improve the drive system of the support wheels in the apparatus having the above-mentioned configuration, and to simplify the drive system of the support wheels. The supporting wheels of the supporting wheels are arranged such that the central vertical axis plane extending from the intermediate portion between the supporting wheels of the leading side row and the supporting wheels of the trailing side row to the longitudinal axis of the drum is at a predetermined angle with respect to a vertical plane depending from the longitudinal axis. It is characterized by being supported by the base frame while being deviated toward the leading side.

With this configuration, the load spreads asymmetrically within the drum as the drum rotates, so that the weight applied to the driven wheels can be distributed in a suitable manner. Therefore, in the case of a dual-wheel drive type, power transmission through the support wheels can be made uniform.

According to the invention, at least two
If two supporting wheels are each driven,
Each motor or power transmission system is connected to the base frame via a buffer. This has the advantage that unevenness in the rotational speed of the supporting wheels caused by the non-circularity of the rolling surface, which inevitably occurs, can be absorbed by the buffer. Therefore, even if there are speed irregularities, the support wheels and the rolling surfaces can be evenly engaged, and power transmission can be made smooth.

The structure can be simplified by constructing this buffer with a reaction arm.

If the two support wheels are driven by motors and are rotatably supported by each swing frame, then according to the invention, the reaction arm near the same engagement point can be connected to the base frame. Preferably, this prevents the rocking frame or support from tilting, so that a precise tracking movement of the wheels relative to the drum can be achieved.

In order to prevent reaction forces from acting on the base frame due to temperature differences when the drum is stationary or inactive, according to the invention, the two rolling surfaces are A reaction member may be provided between the mutually opposing support wheels. It is preferable that this reaction member is constructed of a connecting rod via a support wheel so as to buffer the base frame. Therefore, the base frame can be made into a relatively lightweight structure.

In this case, it is desirable to provide elastic buffers on both sides of the shaft of the support wheel or support base.
By doing so, it is possible to absorb minute shifts without applying a reaction force to the base frame.

In order to make the deflection larger in one direction than in the other direction, the elasticity of the buffers on both sides of each support wheel may be made different.

To reduce maintenance costs and provide adequate noise and shock mitigation, it is desirable to construct the support wheels with rollers made of synthetic resin, such as polyurethane.

In order to extend the life of the plastic roller by reducing the heat loads acting on it, it is desirable to insulate the annular rolling surface from the jacket of the drum.

According to the invention, the annular rolling surface is constituted by a circular rolling plate, with one or more spacers provided between the rolling plate and the drum wall, and The insulation material is sandwiched.
With this configuration, heat transfer or radiant heat can be significantly reduced. The insulation should also end at a certain distance from the drum wall so that a cooling gap is created. Apart from the "cooling" rolling ring, for a robust construction, the spacer may consist of an annular plate connected locally to the drum wall.

In order to increase the strength of the structure, it is possible to increase the thickness of the drum wall in the area where the annular rolling surface is located, because heat transfer takes place from the inside through the drum wall, especially on the input side of the drum. In order to minimize this, the structure may be constructed by overlapping a plurality of layers. The material for each layer is
Anything suitable is fine.

Furthermore, according to the invention, the entrance of the drum in the previously described embodiment has been improved in such a way that the mold pieces can be introduced unhindered. For this purpose, a substantially horizontal support plate is arranged at the entrance of the drum, and a skirt plate is mounted below the entrance, which extends close to the drum wall. By providing this skirt plate, the longitudinal length of the support surface can be reduced, so that the mold pieces can be quickly dropped into the drum without material overflowing to the underside of the support plate. be able to. Additionally, the drum can be filled with even larger loads.

Additionally, the upper rim of the skirt plate is designed to further minimize the aforementioned undesirable overflow.
Near the rising side of the drum, it is inclined upward in a direction away from the center.

Preferably, the support plate and the skirt plate constitute a part of the suction box located in front of the entrance of the drum. In this way, it is possible to avoid drawing in undesirable air from outside the drum in the vicinity of the delivery port, thereby improving the cooling of the air drawn into the drum through the delivery port.

Further, according to the present invention, the apparatus having the above-mentioned configuration is provided with a spraying means for dispersing the cooling liquid in the drum. This spraying means is divided into separately adjustable parts. In this way,
The condition of the molding sand can be controlled more precisely.

To facilitate internal inspection of the drum, a passageway is formed in the drum wall near the last atomizing section. The molding sand is adapted to flow through this passage, the flow rate of which is dependent on the humidity of the molding sand, ie varies depending on the humidity. Therefore, by removing a sample of the molding sand after each rotation and performing sample inspection, it is possible to determine whether the molding sand is in good condition. If the condition deviates from the good condition, the spray amount may be adjusted by appropriately adjusting each spray section.

To prevent clogging of the channels, an agitator, preferably consisting of a pivotable flap, is provided inside the drum. The pivot axis of this pivotable flap extends parallel to the longitudinal axis of the drum, and
The flap is arranged in front of the flap with respect to the direction of rotation of the drum so that the flap has a self-sweeping effect and scrapes off castings or molding sand in the vicinity of the passage.

It is advisable to avoid monitoring means on the path of the passage and outside the drum, preferably consisting of temperature meters, humidity meters or sensors for detecting the presence or absence of molding sand.

The present invention also relates to the structure of the end of the drum in the apparatus having the above-mentioned structure, and the part of the end near the outlet is made of a porous wall and serves as a sieve. .

Preferably, a sand collecting means is provided outside the drum and away from the porous walls so as to scatter sand onto the porous walls when the drum rotates. In this way, the molding sand can be further cooled.

The sand collecting means is preferably a circular tray with only one side open and equipped with a blade.

The depth of the tray is selected to be less than the length of the perforated walls, so that initially the sand is returned to its source, but once through the tray it is removed from the drum through the perforated walls. ing.

Preferably, a trapping member is provided inside the porous wall to hold the casting over a predetermined angle.
This allows a cleaning action to take place when the casting is lifted and dropped.

Furthermore, if a threshold is provided inside the porous wall near the exit of the drum, final separation of the casting and the molding sand can be ensured.

And in order to make it easier to carry out the work,
It is preferable to arrange the discharge belt conveyor along its length below the drum, so that
Sand coming out of the perforated walls, channels or outlet can be removed by the belt conveyor.

Embodiment Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The apparatus shown in the accompanying drawings basically consists of a drum 1 whose front end 1a on the carry-in side is cylindrical and whose rear end 1b on the carry-out side tapers rearward. Two rolling rings 2 are arranged on the outer circumferential surface of the drum 1, the detailed structure of which will be described later. The rolling ring 2 is mounted on support wheels 3, at least one of which is adapted to be driven by a motor 4 via a drive train 5, so that when the motor 4 rotates, the drum 1 moves in the direction of the arrow P1. Rotate in the direction shown.

The wheels 3 are rotatably supported by a base frame 6 placed on a floor 7. A groove is provided in the floor along the longitudinal direction of the drum 1, and a conveyor belt 8 whose upper running body moves in the direction indicated by arrow P2 is accommodated in this groove.

A loading port 9 is formed on the front end surface of the drum 1, and a suction box 10 is arranged around the loading port 9. The suction action is performed by a suction device 11, and the product P to be treated is
The upper running body is conveyed via a conveyor belt 12 which is adapted to move in the direction indicated by arrow P3.

The configuration of the entrance will be explained in detail later. An unloading conveyor 13 is also arranged at the unloading port, and the upper running body of this conveyor 13 moves in the direction shown by arrow P4,
That is, it moves in the same direction as the moving direction of the upper traveling body of the conveyor 12. The end of the drum is constructed with a perforated wall to act as a sieve, which will be discussed in more detail below.

FIG. 2 shows one of the features of the present invention, in which the central longitudinal axis plane perpendicular to the plane of the drawing indicated by line LL passes through the longitudinal central axis of the drum 1. It is shown at an angle to the vertical plane indicated by line V-V. This angle is formed on one side along the rotational direction P1 of the drum 1 from the vertical plane V-V. In other words, below the drum, there are two rows of supporting wheels 3 on the leading side and the trailing side of the drum 1 (both sides relative to the rotational direction of the drum 1) centering on the vertical plane V-V, that is, on the leading side. A support wheel train and a trailing side support wheel train are arranged. Then, a plane passing through the midpoint of the distance between the leading side support wheel train and the trailing side support wheel train and the longitudinal central axis of the drum 1, that is, the central longitudinal axis plane L-
The leading side support wheel train is disposed at a position displaced toward the leading side from the rotational direction of the drum 1 so that L forms an angle indicated by ∝ with respect to the vertical plane V-V.

Thus, by arranging the leading side support wheel train with respect to the vertical plane V-V to be larger than the distance of the trailing side support wheel train with respect to the vertical plane V-V, the dashed line is maintained when the drum 1 rotates. 15
As shown in , it is possible to disperse the weight acting on the support wheels from the load formed by the molding sand and castings which are biased toward the left side of the vertical plane V-V, that is, toward the leading side. Distributing the weight in this manner has the advantage that power, that is, rotational driving force, can be smoothly transmitted to the drum.

In the illustrated embodiment, each wheel 3 constituting the leading and trailing side support wheel trains is preferably made of synthetic resin,
For example, it consists of two rollers made of polyurethane and having smooth, cylindrical outer jackets. A power transmission device 5 connected to a motor 4 is attached to the axle of each support wheel so as to be freely rotatable. The reaction arm 16 is connected to this power transmission device 5.
while the buffer 17 is pivotally supported. This buffer 17 is placed on the base frame 6.

This buffer 17 ensures that the reaction arm 16 can swing over a predetermined angular range with respect to the axis of the support wheel 3, and thereby ensures that the rolling ring 2 is non-circular and However, it does not affect the driving action. If the reaction arm were fixed to the base frame 6, a large force would be applied to the power transmission action, and therefore undesirable slippage would occur between the support wheel 3 and the ring 2.

In order to lock the drum in the longitudinal direction, that is, to prevent the drum 1 from moving in the longitudinal direction, a guide wheel 18 is mounted on the base frame 6, and this guide wheel 18 is used for each rotation. The dynamic ring 2 is held between both sides. The specific configuration and arrangement of this guide wheel 18 are not related to the present invention, and will not be described in detail.

3 and 4 show another embodiment of the driven support wheel 3. In FIG. In this embodiment, driven support wheels 3 are arranged in pairs on a rocking body 20, and each wheel is driven by a motor 4 via a power transmission system 5. The motor 4 and power transmission device 5 are also connected to the rocking body 20. The rocking body 20 extends parallel to the axis of the support wheel 3 and is rotatable around a shaft 21 rotatably supported by the base frame 6 .

In order to cope with the non-circular rolling ring 2, each power transmission device 5 is provided with a reaction arm 16 connected to the base frame 6 via a connecting rod 22 (see FIG. 4). . Since two power transmission devices 5 are shown in FIG. 4, two connecting rods 22 are also shown, but these connecting rods 22 are connected on the same line parallel to the shaft 21, and , are arranged symmetrically with respect to the shaft 21, so that the rocking body does not tilt with respect to the rolling ring 2 when it is driven. Further, in this embodiment, two guide wheels 18 having the same function as in the previous embodiment are provided on the rocking body so as to be located on both sides of the ring 2. It is clear that a rocking body of this construction is particularly suitable for heavy drums capable of handling heavy loads. For example, when the equipment is taken out of service for cleaning or repair, the drum cools to normal ambient temperature. The drum then contracts, but this contraction is caused by rotating the drum after a while so that the supporting wheels 3 correspond to the variable longitudinal distance between the rolling rings 2.
Compensation can be made in conventional ways. but,
Rotating the drums in this way not only requires an inspection manager to be stationed at all times to monitor the drums, but also requires a large amount of power. A reaction arm 23 is arranged between the axles of a support wheel 3 that rolls along a rolling ring 2 that is spaced apart. Therefore, since the distance between the axles does not change, the base frame 6 is not exposed to excessive load (see FIG. 5).

The right support wheel 3 shown in FIG. 5 is preferably able to be offset only slightly in the longitudinal direction with respect to the axle. Therefore, between the three supporting wheels,
Thrust buffers 24 and 25 are provided, and the inner thrust buffer 25 has a different elasticity from the outer thrust buffer 24.
Therefore, the wheels can be deflected inwardly, but outward deflection is becoming more difficult.

Furthermore, the support wheel 3 on the right side shown in FIG. 5 is not adapted to be driven, but is adapted to rotate freely on its axis.

FIG. 6 shows an embodiment of the rolling ring 2. The rolling ring 2 is composed of a relatively thick outer plate 30 and an annular side plate 31, and the outer plate 30 is connected at both ends to the side plate 31 extending in the radial direction of the drum. Each side plate 31 is locally fixed to the wall 32 of the drum 1, as indicated by 33 in FIG.

Also, on the side facing the drum wall 32,
The side plates 31 are interconnected by an inner plate 34, and the rolling ring 2 formed in this way
The internal space is filled with a heat insulating material and held there.

The drum wall 32 in the vicinity of the rolling ring 2 is 3
Due to the layered structure, the drum wall is not only partially reinforced, but also has an insulating effect against heat transfer from the inside of the drum to the outside through the drum wall. There is. Additionally, since the inner plate 34 is separated from the drum wall, the space between them also serves as a heat insulating layer, thus providing additional cooling. With this configuration, the outer plate 30 can be kept relatively cool at all times, which has the advantage of increasing the durability of the synthetic resin support wheels 3.

7 to 9 relate to the entrance at the front of the apparatus shown in FIG. 1. This entrance is located at the end face of the drum 1 in the longitudinal direction,
It is formed by a ring 40 attached to the head end of the drum wall. A relatively short support plate 41 protrudes into the entrance 9, and this support plate 41
A skirt plate 42 is attached to the lower surface and hangs down. This skirt plate 42 is located inside the drum and extends to the inside of the jacket of the drum 1, ie, beyond the inner edge of the ring 40 (see FIG. 8). On the other hand, on the outside, the support plate 41
is the conveyor 1 for carrying in the products to be processed.
It is in contact with 2. Above the end of the carry-in conveyor 12 and the support plate 41, all parts except the part facing the carry-in port and the part corresponding to the product intake port 43 are closed, and a suction pipe whose top is connected to a suction pipe 44 is provided. A box 10 is arranged. Note that the product intake port 43 is partially closed by a suspended flap 45.

FIG. 9 shows a situation where the skirt plate 42 covers most of the lower side of the entrance 9 and closes it. In order to avoid load losses when the drum is rotating in the direction of arrow P1, the upper rim 46 of the skirt plate 42 is tilted upwardly to correspond to the slope angle of the load in the drum. It is inclined towards.

By using this skirt plate 42, the load can be placed deep into the loading port 9, and therefore the length of the support plate 41 can be shortened.
By shortening the length of the support plate 41 in this manner, there is an advantage that it is possible to prevent the products placed on the belt conveyor 12 and being conveyed from becoming clogged just before the entrance 9. . Furthermore, the filling speed, that is, the loading speed can also be increased.

Figures 10 to 12 show passages in the drum wall. This passage 50 is provided for withdrawing a sample of molding sand from within the drum in order to check the condition of the molding sand within the drum.

A portion of this passage 50 is covered by an agitator 51 which is pivoted inside the drum by a shaft 52 extending parallel to the longitudinal axis of the drum. This shaft 52 is positioned in front of the flap-shaped agitator 51 with respect to the rotational direction of the drum shown by arrow P1.

The width of the agitator 51 in the longitudinal direction of the drum 1 is chosen to be smaller than the width of the passage 50, so that even if the agitator 51 is in the closed position as shown in FIG. 51 and comes out from the outlet 50.

Stirrer 51 in the closed position as shown in FIG.
As the drum rotates, it pivots inward of the drum as shown in FIG. 12, so that the casting G stuck inside the drum is separated from the passage 50 and falls downward.

In the vicinity of the rotational movement locus of the passage 50, as shown in FIG. 10, a means 53 is provided for measuring, for example, the temperature and humidity of the molding sand in that part of the drum, or the presence or absence of molding sand. . If the sand flows well in the drum, it means that the sand is too dry, and in this case the sand is sprayed through the atomizing means 54 extending inside the drum, as also shown in FIG. All you have to do is moisten the sand.

The atomizing means 54 are preferably divided into a plurality of adjustable sections, so that the drum 1
It is possible to adjust the condition of the sand in each part of the interior. In addition, this spraying means 54 is shown in FIG.
is shown as having three adjustable sections.

On the other hand, if no sand appears to come out through passage 50, the molding sand in the drum is too wet. In this case, it is sufficient to cut off the water supply to the spraying portion of the spraying means 54 located at a location corresponding to the passage 50, and the spraying means is automatically controlled by the monitoring means 53 via an appropriate electrical or electronic circuit (not shown). It may be controlled.

FIG. 13 shows the discharge end of the drum 1. Since this discharge end is mainly formed of a porous wall 14 that functions as a sieve, only the molding sand can be taken out while leaving the castings in the drum. That is, the casting and the molding sand are separated.

The receiving end of the porous wall 14 is surrounded by a sand collecting cylinder 60 which is composed of an annular outer wall 61 and a closing wall 62 at the front, and is open at the rear. A plurality of blades 63 are arranged between the collection cylinder 60 and the porous wall 14, and are shown in FIG. 13 as being arranged at 90° intervals.

Therefore, when the sand flows into the receiving end of the porous wall 14, the sand falls into the collection tube 60 through the porous wall.
At this time, the blade body 63 carries the sand that has come out and returns it into the drum through the porous wall 14. The molding sand is thus redistributed and cooled at the inlet 9 by the cooling air generated by the suction device 11 and flowing in the direction of the arrow P5. If the molding sand is too wet,
This will cause it to dry even further. The casting is captured by a capturing member 64 located inside the porous wall 14, lifted by a predetermined angle as the drum rotates, and then falls. By dropping it in this way, sand adhering to the casting is removed.
A so-called cleaning effect can be obtained.

By forming a threshold indicated by 65 near the conveyance port of the drum, it is possible to prevent molding sand from coming out from the opening in the end face of the drum head.

The products are finally delivered to the delivery conveyor 13 by the capture member 64.

Note that the present invention is not limited to the above-described embodiments, and various modifications are possible.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a device embodying the present invention seen from the front, Fig. 2 is a cross-sectional view taken along the line - in Fig. 1, and Fig. 3 shows another embodiment of the support wheel drive device. A perspective view, FIG. 4 is a front view of FIG. 3 taken along the arrow, and FIG. 5 is a side view showing a driven support wheel, a non-driven support wheel, and a reaction arm interposed between them. Figure 6 shows the arrow in Figure 1 -
FIG. 7 is a perspective view taken along the arrow in FIG. 1, showing the entrance of the device; FIG. 8 is a vertical cross-section along the line - in FIG. 7. 9 is a rear perspective view taken along the line - in FIG. 1, with a portion of the drum cut away, and FIG. Arrow X in Figure 1
FIG. 11 is a partially cutaway perspective view showing a flap provided near the passage inside the drum; FIG. 12 is a side view showing the flap shown in FIG. 11; 13 is a detailed perspective view of the output end of the drum, taken along arrow XII in FIG. 1; FIG. DESCRIPTION OF SYMBOLS 1...Drum, 2...Rolling ring, 3...Support wheel, 20...Rocking body, 24, 25...Buffer, 35...Insulating material, 41...Support plate, 42...
Skirt plate, 50... Passage, 51... Stirrer (flap), 53... Monitoring means, 54... Spraying means.

Claims (1)

[Scope of Claims] 1. A device that separates castings from molding sand, cools them, and then reuses the molding sand, which has a loading port and a conveying port at both ends, and ,
a horizontal drum having at least two annular rolling surface members disposed on its outer circumferential surface so as to be spaced apart from each other in the longitudinal direction; It consists of support wheels arranged in at least two rows on a frame, and a drive device that rotationally drives at least one support wheel in at least one row, and the drum is connected to the annular rolling surface member through the annular rolling surface member. Treatment of a sand mold containing a casting mounted on two rows of support wheels so as to be able to roll about their longitudinal axes, and configured to be rolled by rotation of at least one of said support wheels by a drive device. In the device, the above 2
Among the supporting wheels of the row, the supporting wheels of the row facing the leading side of the rolling of the drum reach the longitudinal axis of the drum from an intermediate portion between the supporting wheels of the leading side row and the supporting wheels of the trailing side row. A processing device characterized in that the center vertical axis plane is supported by the base frame in a state where it is deviated toward the leading side by a predetermined angle with respect to a vertical plane hanging down from the longitudinal axis. 2. The device according to claim 1, wherein another support wheel of the at least one row is also driven, and each corresponding drive device connects the base frame via a buffer. A device characterized by being connected to. 3. A device according to claim 1 or 2, characterized in that the buffer comprises a reaction arm. 4. According to any one of claims 1 to 3, the two support wheels each driven by a motor are rotatably supported on a swing frame, and the reaction arm is rotatably supported by a swing frame. , a device characterized in that the device is connected to the base frame near the same engagement point. 5. The invention according to any one of claims 1 to 4, wherein the reaction arm is disposed between mutually opposing wheels or wheel supports on two rolling surfaces. Featured device. 6. A device according to claim 5, characterized in that elastic buffers are provided on both sides of the shaft of the wheel or support base. 7. A device according to claim 6, characterized in that the buffers on both sides of the wheel or support have different elasticities. 8. A device according to any one of claims 1 to 7, characterized in that the annular rolling surface is insulated from the jacket of the drum. 9. Claims 1 to 8, characterized in that the annular rolling surface is constituted by a circular rolling plate together with one or more spacers to the wall of the drum. and a heat insulating material is sandwiched between the rolling plate and the wall of the drum. 10. Device according to claim 9, characterized in that the insulation ends at a predetermined distance from the wall of the drum. 11. Device according to claim 9 or 10, characterized in that the spacer is formed by partially connecting an annular plate to the drum wall. 12. A device according to any one of claims 1 to 11, characterized in that the drum wall is thicker at the rolling surface. 13. The device according to claim 12, characterized in that the thick portion of the drum wall is formed of multiple layers. 14. A substantially horizontal support according to any one of claims 1 to 13, in which a skirt plate extending from the lower side to near the drum wall is attached to the entrance of the drum. A device characterized by a protruding plate. 15. The apparatus according to claim 14, wherein the support surface and the skirt plate constitute a part of a suction box in front of the drum entrance. 16 The device according to claim 14 or 15, characterized in that the skirt plate is provided with a rim inclined upward from the center on the side extending above the drum. Device. 17. A device that separates the casting from the molding sand, cools it, and allows the molding sand to be reused,
A horizontal drum that has a loading port and a transport port at both ends and is placed on a support wheel device on a base and rolls in a horizontal state, and a horizontal drum that is placed inside the drum and can freely meter the cooling liquid A device comprising a spraying means for spraying castings, characterized in that a monitoring means comprising a sensor for detecting the presence or absence of molding sand is provided on the outside of the drum wall along the path from the loading port to the conveying port. Including sand mold processing equipment. 18. An apparatus according to claim 17, characterized in that an agitator is provided inside the drum wall in the vicinity of the passage. 19. A device according to claim 18, characterized in that the stirrer comprises a freely drivable flap. 20 The flap according to claim 19, wherein the pivot shaft of the flap extends in the axial direction with respect to the drum and is positioned in front of the flap with respect to the rotational direction of the drum. A device characterized by: