JP3088677B2 - Casting sand loosening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for loosening molding sand for removing molding sand adhering to a cast product after casting.

[0002]

2. Description of the Related Art In a cast product which is separated from a mold after casting, for example, an engine cylinder block (also referred to simply as a cylinder block or a work), which is one of the coarse materials of a cast product for an automobile, is formed in a water jacket. In order to facilitate removal of the child sand by shot blast, so-called "sand loosening" is performed as a pre-step of the shot blast step, in which the work is vibrated to drop the core sand. When such sand loosening is performed, a casting sand loosening apparatus including a knockout device that performs a sand loosening process by applying vibration to a work, and a work transfer device that transfers the work to the knockout device is used. In a conventional casting sand loosening device, a device for transporting a workpiece in a linear direction, for example, a workpiece transport device including a belt conveyor and an unmanned transport vehicle is provided for each knockout device.

[0003]

According to the conventional casting sand loosening apparatus, only one work of sand loosening can be performed on a work. For example, an auxiliary processing accompanying sand loosening processing, for example, reprocessing of sand loosening, When performing a casting burr folding process or the like, a dedicated device having an attached processing device for performing the process is required. In addition, an apparatus dedicated to the auxiliary processing is also provided with a work transfer device for transferring a work in a linear direction for each unit. Therefore, conventionally, in order to perform the sand loosening process and the auxiliary process, devices dedicated to the respective processes each having a work transfer device are provided in parallel. For this reason, a large installation space is required, and complicated work such as setting a work for each processing-dedicated apparatus or monitoring one worker at a time is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to solve the problem by continuously performing a sand loosening process and an attached process. An object of the present invention is to provide a casting sand loosening device capable of simplifying work and reducing installation space.

[0005]

According to a first aspect of the present invention, there is provided a knockout apparatus for performing a sand loosening process by applying vibration to a work made of a cast product, and transferring the work to the knockout apparatus. A casting machine for loosening a foundry sand comprising a work transfer device, wherein the work transfer device comprises a turntable for determining at least three stop positions including a knockout position at which the knockout device is arranged at predetermined angles, and Casting characterized in that one of the stop positions excluding the position is a work carry-in / out position for carrying in and out the work, and the remaining stop position is provided with an auxiliary processing device for performing a process accompanying the sand loosening process. It is a sand loosening device. According to the casting sand loosening device of the first aspect, the work is moved at predetermined angles by the work transfer device constituted by the turntable, and the sand loosening process by the knockout device and the auxiliary process by the auxiliary processing device are continuously performed. Can be done. Therefore, unlike the related art, a complicated work such as setting a work for each device dedicated to each processing of the sand loosening processing and the auxiliary processing and monitoring each worker individually can be halved. In addition, a work transfer device that is common to the knockout device and the auxiliary processing device is used, and the loading and unloading of the work to and from the work transfer device is performed at a single work loading / unloading position. be able to.

According to a second aspect of the present invention, there is provided the casting sand loosening apparatus according to the first aspect, wherein a sand receiving member for accommodating casting sand falling from the work is provided on the rotary table of the work transfer device. A casting sand loosening device characterized in that foundry sand can be discharged from the sand receiving member at a carry-in / out position. According to the casting sand loosening device of the second aspect, the casting sand falling from the work is accommodated in the sand receiving member and discharged at the work loading / unloading position, so that the casting sand can be collected at one place. it can.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 Embodiment 1 of the present invention is described with reference to FIGS.
This will be described with reference to FIG. The casting sand loosening apparatus of the present embodiment loosens the sand of a work made of a casting such as a cylinder block, for example, and transports the work (indicated by reference numeral 21) as shown in a plan view in FIG. A transfer device 1 and a right and left 2 for applying vibration to the work 21 at a predetermined position during the transfer by the work transfer device 1
And knockout devices 3 and 4.

The work transfer device 1 will be described with reference to FIG. 2 showing a partially cutaway plan view thereof and FIG. 3 showing the same left side view. The work transfer device 1 is composed of a turntable for determining three stop positions for each 120 ° angle, and is mounted on a machine base 24 via a support base 24a.
Are supported vertically. A rotary table 26 is rotatably provided on the rotation support shaft 25. Rotary table 2
6 has three rectangular frame-shaped pallet support portions 26a on its outer periphery at equal intervals, that is, at 120 ° intervals. Each pallet supporting portion 26a has a pallet 5 described later.
0 are respectively arranged. Each pallet support 2
On the upper surface of 6a, a surrounding frame 27 surrounding the inside is provided. In FIG. 2, the position of the pallet support portion 26a on the near side (lower side in the figure) is the work loading / unloading position, the position of the pallet support portion 26a on the left rear side (the upper left side in the figure) is the first knockout position, and the right rear side (upper right in the figure). The position of the pallet support portion 26a is referred to as a second knockout position.

A fixed table 28 is fixed to the upper end of the rotary support shaft 25, and a table rotating motor 29 is mounted on the fixed table 28. As shown in FIG. 3, the table rotation motor 29 is provided with a drive gear 30 provided on its output shaft and an internal gear 31 provided on the rotary table 26 and engaged with the drive gear 30 via a gear transmission mechanism. Then, the rotary table 26 is intermittently rotated clockwise in FIG.

On the side of the support stand 24a of the machine stand 24,
A cylindrical tubular bracket 33 penetrating in the vertical direction is attached. The cylinder tube 32 of the table positioning cylinder 32 is provided on the lower end surface of the cylindrical bracket 33.
a is installed vertically with the piston rod 32b facing upward, and the piston rod 32b is directed into the cylindrical bracket 33. The piston rod 32
A positioning shaft 34 guided in the axial direction (vertical direction) by the cylindrical bracket 33 is connected to b.

The rotary table 26 is provided with three positioning fittings 35 having fitting holes 35a capable of fitting with the positioning shaft 34 at 120 ° intervals. Accordingly, the rotary table 26 is positioned at a predetermined stop position by extending the table positioning cylinder 32 and fitting the positioning shaft 34 into the fitting hole 35a of the positioning fitting 35. Rotary table 2
When rotating 6, the table positioning cylinder 32 is shortened and the positioning shaft 34 is pulled out of the fitting hole 35a of the positioning bracket 35 to release the positioning.

On the machine base 24, a number of receiving rollers 37 are arranged on the circumference of the pallet support 26a. Each receiving roller 37 has a roller shaft 3 mounted on a roller bracket 38 installed on the machine base 24.
9 so as to be rotatable. On the other hand, on the lower surface of each pallet support portion 26a of the rotary table 26, a roller rolling pad 40 that can abut on each of the receiving rollers 37 is attached. Each of the receiving rollers 37 rotates in contact with the roller rolling pad 40 of the pallet supporting portion 26a with the rotation of the rotary table 26, and receives the outer end of the pallet supporting portion 26a. The receiving roller 37
Abuts at least two on the roller rolling pad 40 of the rotating one pallet support portion 26a, three on the work loading / unloading position, and four on the first and second knockout positions. It is arranged so that it may touch.

On the lower surface of each pallet support portion 26a, there is provided a sand receiving member 42 formed of an inverted quadrangular pyramid-shaped chute for accommodating molding sand dropped from the work 21. Each sand receiving member 42 is provided with a discharge port 43, and an opening / closing plate 44 for opening and closing the discharge port 43.
Is rotatably mounted via a pin 45. A cam roller 46 is rotatably provided on an outer surface of the opening / closing plate 44 via a mounting shaft 47.

A substantially ring-shaped cam roller guide rail 48 on which the cam roller 46 rolls with the rotation of the rotary table 26 is provided on the machine base 24 around the rotation support shaft 25 via a large number of support members 49. Supported. The cam roller guide rail 48 holds the open / close plate 44 at a position corresponding to the first and second knockout positions, as shown by a two-dot chain line on the left side of FIG. As shown by the solid line in the right part of FIG.
The distance from the rotation axis of the turntable 26 is set so that the rotary table 26 is opened by its own weight. That is, the opening / closing plate 44 is
With the rotation of the rotary table 26, the work table is closed from the open state at the work loading / unloading position to the first knockout position, and is kept closed from the first knockout position to the second knockout position. After the knockout position No. 1, the work starts to be opened near the work carry-in / out position, and is completely opened at the work carry-in / out position. An opening 24b is provided in a portion of the machine base 24 located below the discharge port 43 of the sand receiving member 42 at the work loading / unloading position.

The pallet support 2 of the rotary table 26
6a, a rectangular frame-shaped pallet 50 on which the work 21 can be placed is set horizontally. Although not shown, a positioning member (not shown) for positioning the work 21 is provided on the upper surface of the pallet 50.

Next, the knockout devices 3 and 4 will be described. As shown in FIG. 1, the left and right knockout devices 3 and 4 are symmetrically arranged corresponding to the respective knockout positions, and have basically the same configuration. Therefore, the left knockout device 3 will be described. The description of the knockout device 4 on the right side is omitted by assigning the same reference numerals to the same portions. In the present embodiment, the knockout device 3 on the left side corresponds to the sand loosening processing device according to the present invention, and the knockout device 4 on the right side relates to the re-processing of sand loosening in the auxiliary process attached to the sand loosening process according to the present invention. It corresponds to the attached processing device.

In FIG. 4 showing the left knockout device 3 in a front view and FIG. 5 showing the same right side view, a machine frame 63 is installed on the machine base 24. A lifting box 64 is provided so as to be able to move up and down via left and right sliding means 65. The slide means 65
Slide rail 65a laid vertically on machine frame 63
And a slide block 65b slidably provided on the slide rail 65a and fixed to the rear surface of the elevating box 64 as a set of two upper and lower units. Machine frame 6
A box elevating cylinder 67 is erected between 3 and the elevating box 64, and the elevating box 64 is elevated by the expansion and contraction operation of the box elevating cylinder 67. The cylinder tube 67a of the box elevating cylinder 67 is supported by the machine frame 63, and a piston rod 67b protruding above the cylinder tube 67a is connected to the elevating box 6.
4 is connected to a bracket 68 protruding from the back surface.
Note that the two box lifting / lowering cylinders 67 in the first and second knockout devices 3 and 4 operate synchronously.

The lifting box 64 has a rectangular box shape with an open lower surface, and the work 21 on the pallet 50 in the pallet support 26a of the rotary table 26 is formed.
. In addition, lifting box 6
4 has an openable / closable door 70 on its right side. Further, a seal rubber 69 that can be in close contact with the upper surface of the pallet support portion 26a is attached to the lower end surface of the lifting box 64.

A damper device 72 having an adjusting valve 73 capable of opening and closing the inside of the discharge duct 72a and adjusting the opening is installed on the upper surface of the lifting box 64. On the other hand, a connection duct 74 for connecting a dust collection duct of a dust collection device (not shown) is provided in the machine frame 63. Connection duct 7
The discharge duct 72 a is slidably fitted in the vertical direction as the lifting box 64 moves up and down.

In the left portion of the lifting box 64, front and rear slide shafts 76 are supported in parallel. Columns 79 are provided on both slide shafts 76 via slide bearings 77 so as to be able to move up and down. The column 79 is connected to a piston rod 80b of a work holding cylinder 80. The cylinder tube 80 a of the work holding cylinder 80 is installed on the elevating box 64. The work holding cylinder 80 always urges the column 79 downward, while allowing the column 79 to rise against the urging.

At the front of the column 79, front and rear air hammers 81 are attached via liners 82, respectively. The air hammer 81 has a hammer head 81a that vibrates by introducing compressed air into a hammer body and reciprocating a piston at a lower end in the drawing, as is well known. The hammer head 81a of each air hammer 81 applies vibration by abutting against and hitting a safe site where there is no fear of crushing the casting burr of the work 21. The front and rear air hammers 81 are attached to the lifting box 6.
4 are arranged at positions offset from the left and right centers. For this reason, the work 21 by the air hammer 81 of the left and right knockout devices 3 and 4 symmetrically arranged.
Will be at different locations.

Next, the operation related to the sand loosening processing of the work 21 by the casting sand loosening device will be described.
Now, it is assumed that the loosening of the sand of the work 21 in one process is completed. The work transfer device 1 is in the state shown in FIGS. 2 and 3, and the rotary table 26 is positioned by the extension operation of the table positioning cylinder 32. Due to this positioning, the open / close plate 44 of the pallet support portion 26a at the work loading / unloading position is open, and the open / close plate 44 of the pallet support portion 26a at the first and second knockout positions is closed.

On the pallets 50 set on the respective pallet supports 26a, the work 21 is placed in a positioned state. The work 2 at the first knockout position
Reference numeral 1 indicates that the loosening of the sand by the knockout device 3 on the left has been completed, the work 21 at the second knockout position has completed the loosening of the sand by the knockout device 4 on the right, and the pallet 50 at the work loading / unloading position is next. It is assumed that a work 21 to be processed is placed. The left and right knockout devices 3 and 4 are in the state shown in FIGS. 4 and 5, and the lifting box 64 is in the raised position and the column 79 is in the lowered position.

In the above state, the table positioning cylinder 32 is shortened, the positioning shaft 34 is pulled out from the fitting hole 35a of the positioning bracket 35 to release the positioning, and the table rotating motor 29 is driven to rotate. , The rotary table 26 rotates 120 °. Thereby, the work 21 at the work loading / unloading position is transported to the first knockout position, the work 21 at the first knockout position is transported to the second knockout position, and the work 21 is at the second knockout position. The work 21 is transported to the work loading / unloading position. Subsequently, when the table positioning cylinder 32 is extended, the positioning shaft 34 is fitted into the fitting hole 35a of the positioning fitting 35, and the rotary table 26 is positioned. It is assumed that the work 21 conveyed from the second knockout position to the work carry-in / out position is carried out at the same time as the next work 21 is carried in, or is appropriately carried out before the next work 21 is carried in.

Next, the first and second knockout devices 3,
In FIG. 4, each box lifting cylinder 67 is shortened, and each lifting box 64 is lowered to the lowered position, so that the seal rubber 69 of each lifting box 64 comes into close contact with the upper surface of the pallet support portion 26 a of the rotary table 26. Then, each lifting box 64 covers the work 21. In addition, as each lifting box 64 descends, each lifting box 6
The hammer head 81a of the air hammer 81 in 4 abuts on the hitting portion of the work 21. As a result, the lowering of the column 79 of the air hammer 81 is stopped, but the subsequent work of lowering the lifting boxes 64 shortens the work holding cylinder 80.

In this state, when the air hammer 81 of each of the knockout devices 3 and 4 is operated, the work 21 is vibrated by hitting the hitting portion of the work 21, and the molding sand of each work 21 is removed. Do the "loose sand" to drop.

The foundry sand dropped from the work 21 by loosening the sand passes through the space of the pallet 50 and is stored in the sand receiving member 42 of the pallet support 26a of the rotary table 26. The foundry sand contained in the sand receiving member 42 is discharged by opening the open / close plate 44 of the sand receiving member 42 when the pallet supporting portion 26a is moved to the work loading / unloading position by the rotation of the rotary table 26. Then, it falls downward through the opening 24b of the machine base 24 (see the two-dot chain line arrow in FIG. 3). Note that a sand collection box (not shown) for accommodating the casting sand or a sand discharging conveyor for transporting the casting sand to a predetermined collection place is provided below the machine stand 24 on which the casting sand falls.

The dust floating in the elevating box 64 when the sand is loosened is collected by the dust collecting device by the damper device 72 of the elevating box 64 and the machine frame 6.
3 is collected through the connection duct 74.

When the loosening of the sand by the air hammer 81 is completed, the cylinders 67 for elevating and lowering the boxes are extended, and the elevating boxes 64 are raised to the raised position. In addition, the column 79
The work holding cylinder 80 extends until the column is at the lowering position, and the column 79 is moved up together with the lift box 64 after the column 79 is at the lowering position.

The above operation completes the loosening of the work 21 in one step, and this step is continuously repeated.
It should be noted that it takes a total of three steps from one carry-in to one carry-out.

According to the casting sand loosening device described above, the work 2 is moved by the work transfer device 1 constituted by a turntable.
By moving 1 by a predetermined angle, the sand loosening process by knockout device 3 and the sand loosening process by knockout device 4 can be continuously performed. Therefore, unlike the conventional case, the work 21 is provided for each knockout device 3, 4.
, And complicated work such as monitoring by each worker can be halved. Further, the work transfer device 1 is used in common with the knockout devices 3 and 4, and the loading and unloading of the work 21 to and from the work transfer device 1 is performed at a single work loading / unloading position, so that the installation space is significantly reduced as compared with the conventional device. Can be reduced.

Further, the casting sand falling from the work 21 is stored in the sand receiving member 42 and discharged at the work loading / unloading position, so that the casting sand can be collected at one place.

Further, since different hit positions of the work 21 are hit by the knockout devices 3 and 4, efficient sand loosening can be performed.

[Second Embodiment] Regarding the second embodiment,
This will be described with reference to FIG. 6 showing a schematic plan view thereof. Since the second embodiment is a modification of the first embodiment, the modified portion will be described in detail. As shown in FIG. 6, the work transfer device 1 is constituted by a turntable for determining four stop positions at every 90 ° angle.
In FIG. 6, the stop position in front (lower in the figure) is the work loading / unloading position, the left (left in the figure) is the first knockout position, and the right (right in the figure) is the second knockout position. Similarly, the stop position at the rear (upward in the figure) is defined as a burr folding position. Knockout devices 3 and 4 are arranged at each knockout position, and a well-known burr folding device 6 for breaking a cast burr of the work 21 is arranged at a burr folding position.

The present invention is not limited to the above embodiment, but can be modified without departing from the scope of the present invention. For example, one of the knockout devices 3 and 4 in the embodiment can be replaced with a burr folding device or another attached processing device. Further, knockout devices 3 and 4 and burr folding device 6 according to the second embodiment
Can be appropriately changed. It is also conceivable to set the stop position of the work transfer device 1 to five or more positions.

[0036]

According to the casting sand loosening apparatus of the present invention, the sand loosening processing and the auxiliary processing accompanying the sand loosening processing can be performed continuously, so that the work can be simplified and the installation space can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing a casting sand loosening device according to a first embodiment.

FIG. 2 is a partially broken plan view showing a work transfer device.

FIG. 3 is a left side view of the same.

FIG. 4 is a front view showing the left knockout device.

FIG. 5 is a right side view of the same.

FIG. 6 is a schematic plan view showing an outline of a casting sand loosening device according to a second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 work transfer device 3 knockout device 4 knockout device (attached processing device) 6 deburring device (attached processing device) 21 work 42 sand receiving member

Continuation of front page (72) Inventor Masami Suzuki 3-36 Noritakeshinmachi, Nishi-ku, Nagoya-shi, Aichi Prefecture Noritake Co., Ltd. (56) References JP-A-63-256263 (JP, A) JP-A Sho 61-63352 (JP, A) JP-A-2-37956 (JP, A) JP-A-61-71170 (JP, A) JP-A-6-344116 (JP, A) JP-A-6-344117 (JP, A A) Hikaru 3-4361 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 29/00 B22D 29/04 B22D 31/00

Claims (2)

(57) [Claims] 1. A casting sand loosening apparatus comprising: a knockout device for performing a sand loosening process by imparting vibration to a work made of a cast product; and a work transfer device for transferring the work to the knockout device. The transfer device is constituted by a turntable for determining at least three stop positions including a knockout position where the knockout device is arranged at predetermined angles, and one of the stop positions excluding the knockout position carries in and out the work. An apparatus for loosening a casting sand, comprising a work carrying-in / out position, and an additional processing device for performing a process attached to the sand loosening process at a remaining stop position. 2. The molding sand loosening device according to claim 1, wherein a sand receiving member for accommodating molding sand falling from the work is provided on a rotary table of the work transfer device, and the work receiving / unloading position is set at the work loading / unloading position. A molding sand loosening device characterized in that molding sand can be discharged from a sand receiving member.