Core placement device

Abstract

To provide a core mounting operation device reducing a load to the body of a core mounting operator and improving operability by bringing a core mounting position close to a standing position of the operator.SOLUTION: A core mounting operation device comprises: a pair of roller supporting members extending along the conveyance direction of a lower molding flask; plural rollers provided freely rotatably at the pair of roller supporting members and respectively arranged along the conveyance direction of the lower molding flask; and a supporting member holding part holding the pair of roller supporting members. The plural rollers are respectively arranged at the side face on the outside of the roller support member at a side far from the central position in a direction perpendicular to the conveyance direction of the pair of roller supporting members.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an operating device used when placing a core into a cast lower flask. [Background technology]

[0002] When creating a cavity or hole in a casting, a core is placed inside the mold to prevent molten metal from entering the corresponding area. The core placement process, in which the core is placed in the molding space created in the mold, must be carried out carefully so as not to destroy the sand mold. Conventionally, the task of placing a core C inside a mold involves a worker W standing beside the transport path TP, which is a work device, and placing the core C inside the lower flask LCF after the mold has been formed, which has been transported along the transport path TP, as shown in Figure 4. Summary of the Invention [Problem to be solved by the invention]

[0003] However, conventional work equipment (transport path TP) had the problem that it forced the worker W to lean forward deeply when the position where the core C was placed was far from the worker W's standing position, or when the shape of the core C required the worker W to visually check it from directly above to accurately place it in the mold, thereby reducing the worker W's workability and placing a heavy burden on his or her body.

[0004] In view of the above problems, the present invention aims to provide a core placement work device that brings the position where the core is placed closer to the worker's standing position, thereby reducing the physical burden on the core placement worker and improving work efficiency. [Means for solving the problem]

[0005] According to a first aspect of the present invention, the core placement device comprises a pair of roller support members extending in the direction of transport of the drag flask, a plurality of rollers rotatably mounted on the pair of roller support members and aligned in the direction of transport of the drag flask, and a support member holder for holding the pair of roller support members.

[0006] The rollers are arranged on the outer side surfaces of the pair of roller support members, respectively, on the side farther from the center position of the pair of roller support members in a direction perpendicular to the conveying direction.

[0007] The width of the core placement device that prevents workers from approaching the core placement position is determined by the width of the drag flask and the amount of protrusion of the device that holds the drag flask, which protrudes further outward on both sides than the width of the drag flask. In the core placing apparatus of the present application, the rollers that hold the drag flask are positioned outside the roller support members, so the width of the core placing apparatus is determined by the width of the outer space between the pair of rollers, not the roller support members. This makes it possible to position the core closer to the worker's standing position, reducing the physical strain on the core placing worker and improving work efficiency.

[0008] According to a second aspect of the present invention, the roller is a flanged roller having a flange disposed on the tip side of the rotation shaft of the roller. This allows the flange portion to guide the drag flask in the transport direction.

[0009] According to the third aspect of the present invention, the support member holding portion holds the inner side surface of the roller support member that is closer to the center position of the pair of roller support members in the direction perpendicular to the conveying direction.

[0010] According to this, the support member holding portion that comes into contact with the worker's feet is positioned closer to the center position of the core placement work position than the roller support member when viewed in a plane, so that the worker can more easily approach the core placement work position and perform work efficiently.

[0011] According to a fourth aspect of the present invention, the upper ends of the contact surfaces of the rollers that come into contact with the drag flask are set at a position above the upper surface of the roller support member.

[0012] This allows the drag flask to be reliably supported by the rollers and carried into the core placement position and out to the next process.

[0013] According to a fifth aspect of the present invention, a cover member is provided to cover the outer side surfaces of the pair of rollers that are farther from the center position in the direction perpendicular to the conveying direction and the side surface of the drag flask.

[0014] This allows the core insertion work to be carried out safely at a position close to the core insertion work position, preventing the worker's clothes from getting caught in the work.

[0015] According to a sixth aspect of the present invention, the conveying device further includes a work deck in which the edge portions of the pair of roller support members closer to the center position in a direction perpendicular to the conveying direction are provided adjacent to the support member holding portion. With this, since the support member holding portion is positioned inside the roller support member, the worker can safely move to a standing position on the work deck close to the core insertion work position and work there. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a plan view showing an outline of a molding line in which the core placement device of the present invention is implemented. [Figure 2] 2 is a cross-sectional view taken along line AA in FIG. 1 showing the core fitting device. FIG. [Figure 3] FIG. [Figure 4] FIG. 10 is a cross-sectional view showing a conventional core placing operation device (transport path). DETAILED DESCRIPTION OF THE INVENTION

[0017] (Embodiment) An embodiment in which a core placing operation device according to the present invention is implemented in a molding line will be described below with reference to FIGS. The molding line ML is provided with a transport path TP that runs vertically through it, and the molded upper and lower flasks UCF and LCF are transported along the transport path TP in sequence to the devices that perform each process. As shown in Figure 1, the molding line ML is provided with, from upstream, a mold molding device CM, a sand cutter device SC, an upper and lower flask reversing device ULR, a core placement work area CSA, and an upper flask reversing device UR. The core placement work device 1 according to the present invention is used in the core placement work area CSA.

[0018] In this specification, the direction in which the cope flask UCF and drag flask LCF, which are the transported objects, are transported is referred to as the "transport direction." The transport of the cope flask UCF and drag flask LCF is likened to the flow of water, with the side where the transport starts on the molding line ML being referred to as the "upstream side" and the side where the transport ends being referred to as the "downstream side." In the transport direction, the upstream side is referred to as the "rear" and the downstream side as the "front." Assuming a center line extending in the transport direction or a center line extending perpendicular to the transport direction, the side farther from the center line is referred to as the "outside" and the side closer to the center line is referred to as the "inside."

[0019] (Transport path) The transport path TP transports multiple upper flask UCFs and lower flask LCFs lined up in the transport direction, and is equipped with a stand (not shown) whose lower end is fixed to the floor surface and which holds roller support members, a pair of roller support members (not shown) extending in the transport direction, and rollers (not shown) arranged opposite each other on the inside of the roller support members. The transport path is a known technique, and therefore a description thereof will be omitted.

[0020] The multiple cope flask UCFs and drag flask LCFs lined up on the transport path TP are transported by pusher devices and cushion devices (not shown). The pusher devices and cushion devices are driven by hydraulic cylinders. The hydraulic cylinders are connected to hydraulic pumps, and electromagnetic changeover valves are provided between the hydraulic cylinders and the hydraulic pumps. The operation of the electromagnetic changeover valves is controlled by a control device (not shown). The pusher devices and cushion devices are both well-known technologies, so a detailed description will be omitted. In the core placing work area CSA described later, a core placing work device 1 according to an embodiment of the present invention is used in place of the transfer path TP.

[0021] (Mold molding equipment) The mold-making machine CM pours molding sand into a mating frame consisting of a top flask UCF or bottom flask LCF, a pattern plate (not shown), etc., and then squeezes it to make a mold. The mold-making machine CM is a well-known technique, so a detailed description will be omitted. An example of a mold-making machine is the mold-making machine described in JP 2016-198781 A.

[0022] (Sand cutter device) The sand cutter SC scrapes away excess sand from the top surface of the mold, smoothing the top surface of the mold. The sand cutter SC is a well-known technique, so a detailed description will be omitted. An example of a sand cutter is the sand cutter described in Japanese Patent Application Laid-Open No. 2014-057988.

[0023] (Upper and lower flask reversal device) The upper and lower flask reversing device ULR reverses the upper and lower molds so that the pouring spaces of the upper and lower molds, formed by removing the patterns downward, face upward. The upper and lower flask reversing device ULR is a well-known technology, so a detailed description will be omitted. An example of an upper and lower flask reversing device is the device described in JP 2017-024068 A.

[0024] (Core installation work area) The core placement work area CSA is an area where the work of placing the core C in the pouring space of the lower mold formed in the lower flask LCF is carried out, as shown in Figures 1 and 2. The core placement work area CSA is equipped with a core placement work device 1, a work deck 15, and a crane (not shown) for transporting the core C.

[0025] (Core placement work device) The core placing work device 1 serves two purposes: as a transport device that transports the cope flask UCF and drag flask LCF in the transport direction, and as a core placing work device 1 that performs the core placing work. The core placement device 1 comprises a pair of roller support members 11 extending in the transport direction of the drag flask LCF, a plurality of rollers 12 rotatably mounted on each roller support member 11 and aligned in the transport direction of the drag flask LCF, a support member holder 13 for holding the roller support members 11, and a cover member 14.

[0026] The roller support members 11 are made of, for example, iron and have a vertically long rectangular cross section. The roller support members 11 are arranged in pairs in a direction perpendicular to the conveying direction on the outside of the upper end of a support column 13c of a support member holding unit 13 (described later). A plurality of rollers 12 are provided on the outside of each pair of roller support members 11.

[0027] Each roller 12 is formed into a disk shape from, for example, a steel member. As shown in Fig. 3, each roller 12 is attached to a rotation shaft 12c that extends in a direction perpendicular to the conveying direction on the roller support member 11 and is aligned along the conveying direction. The rotation shaft 12c is fastened to the roller support member 11 so as not to move relative to it. A ball bearing (not shown) is interposed between each roller 12 and the rotation shaft 12c, and each roller 12 is rotatable around the axis of the rotation shaft 12c by the ball bearing.

[0028] Each roller 12 has a contact surface 12a that comes into contact with the bottom surface of the flask MF and rolls on, and a flange 12b that is continuous with the contact surface 12a and protrudes radially from the outer periphery of the tip of the roller 12. The inner side of the flange 12b comes into contact with the side of the drag flask LCF to regulate the crossing direction.

[0029] The rollers 12 are arranged so that they each protrude outward from the outer side of the pair of roller support members 11, on the side farther from the center position in the direction perpendicular to the conveying direction of the roller support members 11. The upper end 12au of the contact surface 12a of each roller 12 that comes into contact with the drag flask LCF is set at a position higher than the upper surface 11u of the roller support member 11. By locating the roller support members 11 inward of the rollers 12 in this way, it has become possible for the worker to work closer to the core placing position NP, for example, about 10 cm, compared to when performing core placing work using a conventional conveying path.

[0030] (Support member holding part) The support member holding portion 13 includes a base member 13a, a horizontal base member 13b, a support column 13c, and a beam member 13d. The foundation members 13a are formed, for example, from steel members with a rectangular cross section, and are provided in pairs to extend along the conveying direction on the floor surface GF. The horizontal foundation members 13b are formed, for example, from I-shaped steel members. The horizontal foundation members 13b are arranged between the paired foundation members 13a to extend in a direction perpendicular to the conveying direction, and multiple horizontal foundation members 13b are lined up along the conveying direction. A pair of support columns 13c are erected vertically on the foundation members 13a at positions corresponding to both ends of each horizontal foundation member 13b.

[0031] The support pillars 13c are formed, for example, from hollow iron members with a rectangular cross section. A plurality of support pillars 13c are lined up along the conveying direction. A beam member 13d is respectively provided across each support pillar 13c in a direction perpendicular to the conveying direction. The beam member 13d is formed, for example, from a hollow iron member with a rectangular cross section. The roller support member 11 is fastened and fixed to the outer upper end of each support pillar 13c by, for example, bolts and nuts so that the roller support member 11 extends along the conveying direction.

[0032] The support member holding portion 13 is disposed on the inside of the pair of roller support members 11, closer to the center position in the direction perpendicular to the conveying direction of the roller support members 11. Therefore, when a worker W stands beside the roller support members 11, the worker W's feet are prevented from coming into contact with the support posts 13c of the support member holding portion 13. This allows the worker W to work from a standing position closer to the core placing work position NP. Compared to when performing core placing work using a conventional conveying path, the worker can now work closer to the core placing work position NP, for example, by approximately 20 cm.

[0033] (Cover member) The cover member 14 prevents the worker W from coming into contact with the drag flask LCF and rollers 12 as they are being transported. The cover member 14 is formed, for example, from an iron plate approximately 1.5 m long and 0.6 m high, and includes a vertical wall portion 14a and a horizontal wall portion 14b formed by bending the upper portion of the vertical wall portion 14a inward at a right angle. The end of the horizontal wall portion 14b is further bent at a predetermined width to form a vertical end portion 14c. The cover member 14 is configured by arranging multiple plates along the conveyance direction.

[0034] The cover member 14 has two mounting holes arranged vertically at the bottom of the vertical wall portion 14a. The two mounting holes are provided at both ends in the conveying direction. The cover member 14 is fastened to the outside of the roller support member 11 at the mounting holes using a support member 141 and a bolt 142. The support member 141 is made of iron and formed into a cylindrical shape, and has a through-hole through the center through which the shaft of the bolt 142 passes. Two female screw holes with female screws are formed vertically next to each other on the outside of the roller support member 11, at a position between the rollers 12 arranged in the conveying direction. The two female screw holes are set so that their axes coincide with those of the two mounting holes in the cover member 14.

[0035] The cover members 14 are provided in pairs on both sides of the transported drag flask LCF, and are positioned so as to cover the outer side surfaces of the pair of rollers 12 that are farther from the center position in the direction perpendicular to the transport direction, as well as the side surfaces and outer top surface of the drag flask LCF.

[0036] (Work deck) The work decks 15 are provided on both sides of the core placing work device 1, and a worker W rides on them to perform the core placing work. The work deck 15 comprises a deck 15a made of, for example, checkered steel plate, and support legs 15b that hold the deck 15a at a position higher than the floor surface GF and lower than the roller support member 11. An edge portion 15c of the work deck 15 on the core insertion work device 1 side is set to abut against the outside of the support column 13c and to be located below the roller support member 11.

[0037] Furthermore, by making the height of the work deck 15 lower than the height of the upper surface of the lower flask LCF, the worker W can bend down less frequently, thereby improving the efficiency of manual core placement work. Furthermore, the work deck 15 is provided such that an edge portion 15c on the side closer to the center position in a direction perpendicular to the conveying direction of the pair of roller support members 11 is disposed close to the support member holding portion 13 (support column 13c). Since this support member holding portion 13 is positioned inside the roller support member 11, the worker W can safely move to a standing position on the work deck 15 close to the core insertion work position NP and work there.

[0038] (Upper flask reversal device) The UCF flipper turns the upper mold (UCF), with the pouring chamber facing upward, upside down so that it can be placed on top of the lower mold (LCF). The UCF flipper is a well-known technique, and therefore a detailed description will be omitted.

[0039] (Control device) A control device (not shown) controls the operation of the pusher device and the cushion device.

[0040] (Activated) Next, the operation of the core placing work device 1 configured as above will be described below with reference to FIGS. In the core placement device 1, the cope flask UCFs and drag flask LCFs are arranged alternately and are transported intermittently by one pitch (the length of one cope flask UCF or drag flask LCF in the transport direction) by a pusher device and a cushion device. The transport operation is controlled by a control device (not shown).

[0041] The transported UCF and LCF are delivered from the ULR (Unloading Flask Reversal Machine) in the previous process with the pouring chambers of the respective upper and lower molds facing upward. When the lower flask LCF requiring the core C is positioned at a position corresponding to the worker W on the work deck 15, the core C is placed in the pouring space of the lower mold formed in the positioned lower flask LCF. The lower flask LCF containing core C is transported to the next process.

[0042] As is clear from the above description, the core placement work device 1 of this embodiment comprises a pair of roller support members 11 extending in the transport direction of the drag flask LCF, a plurality of rollers 12 rotatably mounted on the pair of roller support members 11 and aligned in the transport direction of the drag flask LCF, and a support member holder 13 that holds the pair of roller support members 11.

[0043] The rollers 12 are arranged on the outer side surfaces of the pair of roller support members 11, which are farther from the center position of the roller support members 11 in a direction perpendicular to the conveying direction.

[0044] With this, the rollers 12 that hold the drag flask LCF are positioned outside the roller support members 11, so the width of the outside between the pair of rollers 12, rather than the roller support members 11, is the width of the core placing work device 1. This makes it possible to bring the core placing work position NP closer to the standing position of the worker W, reducing the physical burden on the worker W performing the core placing work and improving work efficiency.

[0045] The roller 12 is a flanged roller 12 in which a flange portion 12b is disposed on the tip side of the rotation shaft of the roller 12. This allows the flange portion 12b to guide the lower flask LCF in the transport direction.

[0046] The support member holding portion 13 holds the inner side surface of the pair of roller support members 11, which is closer to the center position in the direction perpendicular to the conveying direction of the roller support members 11.

[0047] According to this, the support member holding portion 13 that comes into contact with the feet of the worker W is positioned closer to the center position of the core placement work position NP than the roller support member 11 when viewed in a plane, so that the worker W can more easily approach the core placement work position NP and perform work efficiently.

[0048] Furthermore, the upper end 12au of the contact surface portion 12a of the roller 12 that comes into contact with the drag flask LCF is set at a position higher than the upper surface 11u of the roller support member 11.

[0049] This allows the drag flask LCF to be reliably supported by the rollers 12 and carried into the core placement position NP and out to the next process.

[0050] In addition, a cover member 14 is provided to cover the outer side surfaces of the pair of rollers 12 that are farther from the center position in the direction perpendicular to the conveying direction and the side surface of the drag flask LCF.

[0051] This allows the worker W to safely perform the core insertion work at a position close to the core insertion work position NP, preventing the worker W's clothes from getting caught in the work.

[0052] The apparatus further includes a work deck 15 in which an edge portion 15c on the side closer to the center position in a direction perpendicular to the conveying direction of the pair of roller support members 11 is provided adjacent to the support member holding portion 13. As a result, since the support member holding portion 13 is positioned inside the roller support member 11, the worker W can safely move to a standing position on the work deck 15 close to the core insertion work position NP and work there.

[0053] Although the roller 12 in this embodiment is a flanged roller, the present invention is not limited to this. For example, a roller without a flange may be combined with a side roller that regulates the direction intersecting the flask transport direction.

[0054] The present invention is not limited to the above-described embodiments shown in the drawings, but can be modified appropriately within the scope of the present invention. [Explanation of symbols]

[0055] 1: core loading work device, 11: roller support member, 11u: upper surface, 12: roller, 12a: contact surface portion, 12au: upper end, 12b: flange portion, 12c: rotating shaft, 13: support member holding portion, 14: cover member, 15: work deck, C: core, LCF: lower flask, UCF: upper flask.

Claims

1. a pair of roller support members extending in the direction of transport of the drag flask and disposed below the drag flask; a plurality of rollers rotatably mounted on the pair of roller support members, aligned along the conveying direction, and rolling against the bottom surface of the drag flask; a support member holding portion that holds the pair of roller support members; A core insertion work device comprising: A core placement work device in which the multiple rollers are each arranged on the outer side of a pair of roller support members that is farther from the center position of the roller support members in a horizontal direction perpendicular to the conveying direction.

2. 2. The core placing apparatus according to claim 1, wherein the roller is a flanged roller having a flange disposed on the outer periphery of the tip end side of the roller.

3. A core insertion work device as described in claim 1 or 2, wherein the support member holding portion is arranged inside the pair of roller support members, on the side closer to the center position of the roller support members in a horizontal direction perpendicular to the conveying direction.

4. 4. A core placing apparatus according to claim 1, wherein the upper end of the contact surface of the roller that contacts the drag flask is set at a position above the upper surface of the roller support member.

5. 5. A core placing apparatus according to claim 1, further comprising a cover member for covering the outer side surfaces of the pair of rollers that are farther from the center position in a horizontal direction perpendicular to the conveying direction and the side surface of the drag flask.

6. A core placement work device as described in claim 3, further comprising a work deck arranged parallel to the conveying direction and on which a worker boards to perform core placement work, wherein the edge portion of the work deck on the side closest to the center position of the pair of roller support members in a horizontal direction perpendicular to the conveying direction is arranged close to the support member holding portion.

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