TW201919794A - Casting line for snap flask molding and method for operating casting line for snap flask molding - Google Patents

Abstract

Provided are a casting line for snap flask molding in which equipment and process are improved and of which equipment expenses and running cost are reduced, and a method for operating the casting line for snap flask molding. The casting line (1) for snap flask molding is provided with a pouring line (2) and a cooling line (3) for transporting a surface plate carriage (16) on which a flask (M) is mounted. The casting line for snap flask molding is provided with: a jacket transfer device (6) for transferring a jacket (J) covering the flask in the cooling line onto a flask arranged in the pouring line; a weight transfer device (7) for transferring a weight (W) mounted on the flask in the cooling line onto the flask arranged in the pouring line; a lifting/lowering cylinder (17) for moving the jacket transfer device and the weight transfer device together in an up/down direction; and a lateral moving cylinder (18) for moving the jacket transfer device and the weight transfer device together in a lateral direction.

Description

Boxless mold casting line and operation method of boxless mold casting line

The invention relates to a casting line for a boxless mold and a method for operating the same.

Previously, the following casting lines for boxless molds have been known. They transport molds made and closed by boxless molders, and before casting, they include the transfer of sleeves and weights to the molds. Device (for example, refer to Patent Document 1). The casting line for a boxless casting mold described in Patent Document 1 is formed in a rectangular shape, and is arranged such that a flat plate for conveying the casting mold is cyclically moved by an air cylinder, a buffer cylinder, a transfer trolley, or the like. The casting line for a boxless mold uses a cylinder and a buffer cylinder to hold and move a group of flat plates on a linear production line.

In addition, a casting line for a boxless mold having a sleeve transfer device and a weight transfer device installed throughout a cooling line and a casting line is known (for example, refer to Patent Document 2). The sleeve transfer device and the weight transfer device can be raised and lowered on a cooling line and a casting line by respective cylinders. In addition, the movements in the raising and lowering directions and the lateral direction of the sleeve transfer device and the weight transfer device are moved using separate cylinders, respectively.

Since the casting line for the boxless mold is a complex of a large-scale device as described above, the equipment cost is high. In addition, a large amount of power is required to operate a casting line for a boxless mold. Therefore, reductions in the cost of equipment constituting a casting line for a boxless mold, or reductions in operating costs due to reductions in steps, etc. are required.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a method for operating a casting line for a boxless mold and a casting line for a boxless mold in which the weight of the equipment is reduced, the steps are improved, and the equipment cost or the operation cost is reduced.
[Prior Art Literature] [Patent Literature]

Patent Document 1: Japanese Patent Shikaihei 06-061363
Patent Document 2: Japanese Patent Publication No. 54-116517

According to the present invention, there is provided a casting line for a boxless casting mold, which includes a casting line and a cooling line for transporting a flat-bed trolley on which the casting mold is placed, and is characterized by comprising:
A casing transfer device comprising a plurality of casing arms for lifting the casing, transferring the casing covering the mold in the cooling line to the mold disposed on the casting line; and a weight transfer device, It includes a plurality of weight arms that lift a weight, and transfers the weight placed on the mold in the cooling line to the mold disposed on the casting line; and includes a lifting cylinder that transfers the sleeve The tube transfer device and the weight transfer device move in the vertical direction as a whole; and the lateral movement cylinder moves the sleeve transfer device and the weight transfer device in the horizontal direction as a whole.

With this configuration, the movement of the casing transfer device and the weight transfer device is performed by two of a lift cylinder and a lateral movement cylinder. Therefore, the equipment can be reduced as compared with the previous case where the casing transfer device and the weight transfer device are moved in the up-down direction and the lateral direction by using different moving mechanisms, respectively.

According to a preferred form of the present invention, the casting line for a boxless mold further includes:
The first moving platform and the second moving platform are arranged in such a way that one end and the other end of the casting line and the cooling line are connected respectively, so that the flat-bed trolley moves;
A first plate trolley conveying mechanism, which is arranged at one end of the casting line, and conveys the plate trolley placed on the first moving platform to the casting line; and a second plate trolley conveying mechanism, which is provided at At the other end of the cooling line, the flat trolley placed on the second moving platform is transferred to the cooling line;
The first moving platform and the second moving platform include:
A movable trolley, which carries the flat trolley and moves between the casting line and the cooling line;
A trolley stopper mechanism that abuts the mounted trolley, and a trolley fixing mechanism that abuts the trolley from a side opposite to the trolley stopper; and the trolley stopper and the trolley The fixing mechanism clamps and fixes the placed flat trolley on the movable trolley.

With this configuration, in the casting line, the flat-bed trolley is transferred to the movable trolley of the second moving-table by the first flat-bed trolley transport mechanism. Then, the flat trolley is clamped by the trolley stop mechanism and the flat trolley fixing mechanism, and is stopped and fixed on the movable trolley of the second moving platform. The cooling line has the same configuration as the casting line. That is, in the cooling line, the flat-bed trolley is transferred to the movable trolley of the first moving platform by the second flat-plate trolley conveying mechanism, and is clamped by the stopper mechanism and the fixed mechanism of the flat-plate trolley to the movable trolley of the first moving platform. Stop and fix.

According to a preferred form of the present invention, in the casting line for a boxless mold, the flat trolley is equipped with wheels and axles, the stopper mechanism of the trolley is in contact with the wheel of the flat trolley, and the fixing mechanism of the flat trolley is connected to the flat plate The axle of the trolley abuts. With this configuration, the trolley stopper mechanism abuts on the wheels, the flat trolley fixing mechanism abuts on the axle, and the flat trolley is clamped and fixed by the flat trolley fixing mechanism and the trolley stopper mechanism.

The flat trolley fixing mechanism and the trolley stopping mechanism do not need the buffer cylinder included in the existing casting line for boxless molds, and do not require power such as oil pressure. Therefore, it is related to reduction of equipment cost and reduction of operation cost of a casting line for a boxless mold. Furthermore, when the movable trolley carrying the flat trolley is moved between the casting line and the cooling line, the flat trolley is clamped and fixed on the movable trolley by using the trolley stop mechanism and the flat trolley fixing mechanism. Therefore, the flat-bed trolley can be moved safely.

According to another preferred form of the present invention, on the casting line for a boxless mold, the flat-bed trolley fixing mechanism has a contact member abutting on the axle, and an elastic member supporting the contact member in a displaceable manner, Connected to the axle, the contact member is also displaced, the flat trolley is movable, and when the wheel abuts on the trolley stop mechanism, the contact member abuts on the side opposite to the trolley stop mechanism The platform trolley is fixed to the movable trolley on the axle. Therefore, the flat trolley can be fixed on the movable trolley without power such as oil pressure.

According to another preferred form of the present invention, the weight arm includes a weight lifting claw that engages with the weight when the weight is lifted,
The weight lifting claw is detachably mounted on the weight arm.
With this configuration, when the weight lifting claw is partially worn, it can be partially replaced.

According to another preferred aspect of the present invention, the weight lifting claw has an inclined surface that corrects the position of the weight when lifting the weight.

When the weight transfer device is used to transfer the weight of the cooling line to the casting line, there are situations in which the setting position of the weight is staggered in each cycle due to a slight misalignment of the core during the placement. In addition, due to the accumulation of the misalignment, the weight transfer device cannot lift the weight, which may cause problems such as dropping the weight. Therefore, the existing weight transfer device needs a core of a weight placement position including difficult steps. With this configuration, when a plurality of weight arms are used to lift the weight, the "misalignment" of the weight can be corrected by the inclined surface of the weight lifting claw. With this, the "dislocation" of the weight does not accumulate, so the weight arm can be prevented from falling off the weight. Moreover, the core removal of the previously required hammer placement position may not be required.

According to other preferred forms of the present invention, the above-mentioned weight lifting claw has: a first engaging member which is detachably mounted on the weight arm; and a second engaging member which is detachable. It is mounted on the first engaging member. With this structure, in order to correct the "misalignment" of the weight, the inclined surface slid by the weight is partially and greatly worn, for example, if the inclined surface of the first engaging member is greatly worn, it is only replaced If the inclined surface of the second engaging member is greatly worn, only the second engaging member can be replaced, and maintenance costs can be suppressed.

According to another preferred form of the present invention, the sleeve transfer device further includes a plurality of rod members extending in the height direction of the mold and movable in the vertical direction, and the lower end of the rod member is abutted against the sleeve. Configuration on the way.
With this configuration, when the sleeve of the cooling line is transferred to the casting line, the sleeve can be lifted from below with the sleeve arm, and the sleeve can be squeezed from above with the rod member. Thereby, when the sleeve is transferred, the sleeve can be firmly grasped and transferred.

According to other preferred forms of the present invention,
The length of the rod member is adjusted so that the lower end becomes the height above the upper end of the sleeve when the rod member is moved to the lowest point.
With this configuration, even when the sleeve is dropped on the mold of the casting line, the position of the sleeve with respect to the mold is misplaced. The excess force of the mold does not work. Therefore, mold failure such as mold misalignment does not occur, and the sleeve can be covered on the mold.

According to other preferred forms of the present invention,
In the casting line for boxless molds,
The weight arm is opened and closed in a direction parallel to the progress direction of the casting line and the cooling line, and the sleeve arm and the weight arm are displaced in a direction perpendicular to the direction of opening and closing of the weight arm.

There are matters that must be considered in order to move the casing transfer device and the weight transfer device in the lowered state in the casting line to the cooling line laterally in the lowered state. When it is moved laterally, the casing arm and the weight arm do not collide with those placed on the flatbed trolley (mold, casing and weight) in the casting line. Therefore, the opening and closing directions of the weight arm are parallel to the direction of progress of the casting line and the cooling line. By moving the hammer arm laterally and passing it between the casting line and the cooling line, the casing arm and the hammer arm and the casting line are placed on a flat-bed trolley (mold, Casing and hammer) will not collide. In addition, the casing arm can be constructed by lifting the casing without opening and closing, and can be constructed without colliding with a person (mold, casing, and weight) placed on a flat-bed trolley without opening and closing.

On the other hand, since the opening and closing direction of the weight arm is set to be parallel to the direction of progress of the casting line and the cooling line, there is a concern that the sleeve arm collides with the weight arm when the weight arm is opened. Therefore, the positions of the sleeve arm and the weight arm are shifted in the opening and closing direction and the vertical direction of the weight arm. With this, in the state where the weight arm is opened, it is also possible to prevent these from colliding.

According to other preferred forms of the present invention,
In the casting line for boxless molds,
The plate member on which the mold is placed in the flat bed trolley is formed of a steel plate. Previously, the plate members of commonly used flat trolleys were castings. With this configuration, the use of a steel plate can reduce the manufacturing cost of a flat bed trolley.

According to other preferred forms of the present invention,
A method for operating a casting line for a boxless mold includes:
The sleeve transfer step uses the sleeve transfer device to remove the sleeve covered on the mold in the cooling line and cover the mold disposed on the casting line;
The weight transfer step uses the weight transfer device to lift the weight placed on the mold in the cooling line and place the weight on the mold disposed on the casting line;
The returning step of the transfer device moves the sleeve transfer device and the weight transfer device from the casting line to the cooling line; and the sleeve transfer device and the weight transfer device in the transfer device return step are performed only by It moves in the horizontal direction and moves from the casting line to the cooling line.

With this configuration, the sleeve transfer device after covering the sleeve on the mold disposed on the casting line and the weight transfer device after placing the weight on the mold disposed on the casting line are in a lowered state. In the lowered state, the casing transfer device and the weight transfer device are laterally moved to the cooling line. Therefore, compared with a case where the casing transfer device and the weight transfer device arranged on the casting line are moved laterally after being raised, this configuration can shorten the cycle time. In addition, since the number of actuator operations per cycle is reduced, the running cost can be reduced.

According to other preferred forms of the present invention,
In the operation method of the casting line for the boxless mold,
In the casting line for the boxless mold,
The above-mentioned flat trolley is equipped with wheels and axles, and further includes a first moving platform and a second moving platform, which are arranged in such a manner that one end and the other end of the casting line and the cooling line are connected respectively, and the flat plate is placed thereon. Trolley to move it;
A first plate trolley conveying mechanism, which is arranged at one end of the casting line, and conveys the plate trolley placed on the first moving platform to the casting line; and a second plate trolley conveying mechanism, which is provided at At the other end of the cooling line, the flat trolley placed on the second moving platform is transferred to the cooling line;
The first moving platform and the second moving platform include:
A movable trolley, which carries the flat trolley and moves between the casting line and the cooling line;
For the above-mentioned placed flat trolley, the stopper mechanism of the trolley contacting the wheels of the flat trolley and the fixing mechanism of the flat trolley contacting the axle; and the operation method of the casting line for the boxless mold includes:
In the casting line transfer step, the above-mentioned flat trolleys placed on the first moving platform and the casting line are spaced by the first flat trolley transmission mechanism;
A second moving platform moving step, moving the movable platform in the second moving platform from one end side of the casting line to one end side of the cooling line;
The cooling line transfer step uses the above-mentioned second flat-bed trolley transfer mechanism to transfer the flat-bed trolleys placed on the second moving platform and the cooling line at a distance; and the first moving platform moving step moves the first moving platform into the first moving platform. The movable trolley is moved from the other end side of the cooling line to the other end side of the casting line side; and is transferred to the first moving platform and the first through the casting line transfer step and the cooling line transfer step. The flat trolley on the second moving platform is fixed to the movable trolley in the first moving platform and the second moving platform through the flat platform fixing mechanism and the trolley stopping mechanism.
With such a configuration, the buffer cylinder included in the existing boxless mold casting line is not required, and the reduction of the equipment cost and the reduction of the running cost are related to the boxless mold casting line. Furthermore, when the movable trolley carrying the flat trolley is moved between the casting line and the cooling line, the flat trolley is clamped on the movable trolley by the trolley stop mechanism and the flat trolley fixing mechanism, thereby being fixed. Therefore, the flat-bed trolley can be moved safely.

According to other preferred forms of the present invention,
In the casting line for boxless molds,
Each of the lifting cylinder and the laterally moving cylinder moves at only one telescopic speed. With this configuration, it is not necessary to adjust the operating speeds of the lift cylinder and the lateral movement cylinder, so that it is not necessary to adjust the expansion and contraction speed of the cylinder such as a valve for variable speed control.

As described above, the present invention can reduce the weight of the entire equipment constituting the casting line for the boxless mold. In addition, by reducing the overall weight of the device, the size of the actuator (for example, a cylinder) can be reduced, and the operating cost of the actuator can be reduced. Furthermore, the operation cost can be reduced by reducing the number of steps. Furthermore, by reducing the number of actuators, it is possible to reduce the weight of the casting line for a boxless mold and reduce the running cost.

This application is based on Japanese Patent Application No. 2017-166483 filed with Japan on August 31, 2017, and its content forms part of the content of this application.
In addition, the present invention can be fully understood from the following detailed description. However, the detailed description and specific examples are ideal embodiments of the present invention, and are described for illustrative purposes only. The reason is that those skilled in the art will understand various changes and modifications based on this detailed description.
The applicant does not intend to present any of the described embodiments to the public. Among the changes and substitutions disclosed, those that may not be included in the sentence within the scope of the patent application are also part of the invention under equality.
In the description of this specification or the scope of application, the use of nouns and the same designators shall be construed to include both the singular and plural as long as there is no special instruction or as long as it is not explicitly denied by context. The use of any exemplifications or illustrative terms (such as "etc.") provided in this specification is only for the purpose of easily explaining the present invention. As long as it is not specifically described in the scope of the application, the scope of the present invention is not limited limit.

An example of an embodiment of a casting line for a boxless mold will be described with reference to the drawings. In the following description, unless otherwise specified, the up-down and left-right directions refer to directions in the drawings. In addition, the so-called mold M refers to those made of mold sand, and the upper frame and the lower frame match. In addition, the lower part of the outer periphery of the upper frame and the upper part of the outer periphery of the lower frame have a tapered shape, and the upper frame and the lower frame are combined to form a tapered shape at the center of the outer periphery of the mold M. The inner surface of the sleeve J has a tapered shape corresponding to the tapered shape of the mold M. The present invention is not limited to the configuration of this embodiment, and can be appropriately changed as necessary.

Fig. 1 is a plan view of a casting line for a boxless mold. As shown in the figure, a casting line 1 for a boxless mold has a casting line 2 and a cooling line 3 arranged in parallel. The first transfer platform 4 and the second transfer platform 5 are respectively provided at both ends of the casting line 2 and the cooling line 3. With the above configuration, the flat bed trolley 16 (refer to FIG. 3) carried by placing the mold M is configured to circulate in the casting line 1 for the boxless mold. In addition, the casting line 1 for a boxless mold is configured to convey the flat pallet 16 at a certain interval, and includes a first flat pallet transport mechanism 13 and a second flat pallet transport mechanism 14. In addition, the mold M is mold-made by the boxless mold making machine 10, and is carried in from the carrying-in position 11 to the casting line 2. In addition, the casing transfer device 6 and the weight transfer device 7 are arranged in the form of straddling the casting line 2 and the cooling line 3. In addition, the arrows shown in FIG. 1 indicate the proceeding direction of the mold M placed on the platen 16 and the platen 16. In addition, in FIG. 1, the casting machine which casts a molten soup in a mold is abbreviate | omitted, and in this specification, description about the casting process is abbreviate | omitted.

The first moving platform 4 and the second moving platform 5 each have the same structure. As shown in FIG. 2 and FIG. 3 by the second moving platform 5, the first moving platform 4 and the second moving platform 5 each include a movable platform 12. In addition, the casting line 2 side of the first transfer platform 4 includes a first flat-bed trolley transfer mechanism 13, and the cooling line 3 side of the second transfer platform 5 includes a second flat-bed trolley transfer mechanism 14. The first platform trolley transfer mechanism 13 is configured to transfer the platform trolley 16 carried on the movable trolley 12 of the first transfer platform 4 to the casting line 2. In addition, the second platform trolley transfer mechanism 14 is configured to transfer the platform trolley 16 placed on the movable trolley 12 of the second transfer platform 5 to the cooling line 3.

As shown in FIGS. 3 and 4, the movable dolly 12 includes a flat-bed dolly fixing mechanism 15 and a dolly stopper mechanism 20. The platen trolley fixing mechanism 15 and the platen stop mechanism 20 are configured so that when the platen trolley 16 is stopped on the movable platen 12, the wheels 19 and axles 19 a which are components of the platen trolley 16 can be clamped. In other words, the flat-bed trolley fixing mechanism 15 abuts against the axle 19 a, and the trolley stopper mechanism 20 abuts against the wheels 19 from the side opposite to the flat-plate trolley fixing mechanism 15, thereby fixing the flat-plate trolley 16 to the movable trolley 12. In this embodiment, the portion of the trolley stopper mechanism 20 that abuts against the wheel 19 is made of a low-elastic material (for example, urethane or rubber). Thereby, the impact when the bogie stopper mechanism 20 contacts the wheel 19 can be reduced. In addition, the platen trolley fixing mechanism 15 and the platen stop mechanism 20 can clamp the platen trolley 16 by parts other than the wheels 19 and the axles 19a, and fix the platen trolley 16 to the movable dolly 12, and the portions to be held are not limited.

As shown in FIGS. 5 and 6, the casing weight transfer device 8 includes a casing transfer device 6, a weight transfer device 7, a lifting cylinder 17, and a laterally moving cylinder 18. The casing transfer device 6 and the weight transfer device 7 are arranged so as to span the casting line 2 and the cooling line 3. The sleeve transfer device 6 and the weight transfer device 7 are integrated by a connection frame 9. In addition, the casing transfer device 6 and the weight transfer device 7 are integrated into one body, and are not limited to the connection frame 9, and may be rod-shaped or plate-shaped members connecting the two, or other known structures.

As shown in FIG. 6, the sleeve transfer device 6 includes a sleeve arm 6A for lifting the sleeve J, and the weight transfer device 7 includes a weight arm 7A for lifting the weight. In addition, flange portions JF and WF are provided on the sleeve J and the weight W, respectively. Further, the casing arm 6A includes a casing lifting claw 6B which is hooked on the casing flange portion JF when the casing J is lifted, and the weight arm 7A includes a casing flange WF which is hooked on the weight W The upper hammer lifts the claw 7B. The sleeve J can be lifted by hooking the sleeve arm 6A on the sleeve flange portion JF, and the weight W can be lifted by hooking the weight arm 7A on the weight flange portion WF.

The opening and closing direction of the weight arm 7A is a direction horizontal to the casting line 2 and the cooling line 3. In addition, as shown in FIG. 7, the sleeve arm 6A and the weight arm 7A are arranged so as to be misaligned when viewed from the side direction of the casting line 1 for a boxless mold. In other words, the sleeve arm 6A and the weight arm 7A are arranged in a direction that is perpendicular to the opening and closing direction of the weight arm 7A, and are disposed at positions that do not overlap. collision. In this embodiment, the casing transfer device 6 is configured to clamp both sides of the casing J, and includes two casing arms 6A on one side and the other side of the casing J, respectively. The weight transfer device 7 includes four weight arms 7A so as to hold the four corners of the weight W.

As shown in FIG. 6, the cannula transfer device 6 includes a cannula brush 6C. The casing brush 6C extends outward from the casing transfer device 6. The casing brush 6C is disposed so as to be in full contact with the inner surface of the casing J by raising and lowering the casing J. When the casing brush 6C lifts the casing J on the cooling line 3, the casting sand attached to the inner surface of the casing J is swept off. In addition, when the casing J is lowered on the casting line 2, the casting sand adhering to the inner surface of the casing J is also swept off.

As shown in FIG. 7, the sleeve transfer device 6 includes a sand scattering prevention cover 6D. The sand scattering prevention cover 6D is provided between the mold M to be lifted and lowered by the sleeve transfer device 6 and the molds M on both sides adjacent to the mold M, respectively. In this embodiment, the sand scattering prevention cover 6D is arranged to cover the gap between the two casing arms 6A on one side, and to cover the gap between the two casing arms 6A on the other side. Way to configure.

The sand scattering prevention cover 6D can prevent the casting sand sweeping off by the casing brush 6C from being scattered into the mold M existing next to the casing transfer device 6 when the casing J is raised and lowered. Thereby, the casting sand can be prevented from entering the mold from the gate of the mold M existing in the next wall.

In addition, as shown in FIG. 6, the cannula transfer device 6 includes a rod member 23. The rod member 23 is arranged to extend in the up-down direction of the sleeve transfer device 6 and is movable in the up-down direction. When the casing transfer device 6 raises and lowers the casing J, the lower end of the rod member 23 comes into contact with the upper surface of the casing flange portion JF. In the sleeve transfer step described later, on the casting line 2, the sleeve J is to be detached from the sleeve flange JF immediately before the sleeve J is covered on the mold M (the inner surface of the sleeve J is to be in contact with the mold M). In this manner, the length of the rod member 23 is adjusted. In other words, the length of the rod member 23 is adjusted such that when the rod member 23 moves to the lowest point, the lower end becomes the height above the upper end of the sleeve J. In addition, in this embodiment, the four corners of the sleeve J each include four rod members 23. In addition, the upper ends of the four rod members 23 each include a weight for the rod member. With the weight of the weight, the rod member 23 presses the sleeve flange JF downward, and the sleeve arm 6A is difficult to protrude from the sleeve The JF at the edge is misaligned, making it difficult to detach. In addition, when the weight of the rod member 23 has a weight necessary to press the sleeve flange JF downward, a weight for the rod member may not be present.

The weight lifting claw 7B in the weight arm 7A includes a first engaging member 21 and a second engaging member 22. FIG. 8 shows the shapes of the weight arm 7A, the first engaging member 21, and the second engaging member 22. The first engaging member 21 is detachably mounted on the weight arm 7A, and the second engaging member 22 is detachably mounted on the first engaging member 21. With this configuration, replacement of the first engagement member 21 and the second engagement member 22 is facilitated. In the present embodiment, the first engaging member 21 and the second engaging member 22 are attached by a nut (not shown). The first engagement member 21 and the second engagement member 22 have inclined surfaces K1 and K2, respectively. The inclined surfaces K1 and K2 face upward when the weight W is raised and lowered (see FIG. 9). Therefore, the "misalignment" of the weight can be corrected by the inclined surfaces K1, K2. At this time, when the inclined surfaces K1 and K2 are partially worn away by sliding with a weight, for example, if the inclined surface K1 of the first engagement member 21 is greatly worn, only the first engagement member 21 is replaced. If the inclined surface K2 of the second engaging member 22 is greatly worn, only the second engaging member 22 can be replaced, and maintenance costs can be suppressed. In addition, the weight lifting claw 7B is not limited to the configuration of the first engaging member 21 and the second engaging member 22, and may be one member that can be detached from the weight arm 7A, or may be three or more. Of the building.

In addition, the top plate portion (the portion on which the plate member of the mold M is placed) in the flat bed trolley 16 shown in FIG. 10 is made of a steel plate. The top plate portion of the flat bed trolley 16 in the existing boxless mold casting line 1 is composed of a casting. However, compared with the steel plate, the manufacturing cost of the casting is increased, and the weight is increased. The above-mentioned problem can be eliminated by the flat bed trolley 16 made of a steel plate.

Next, an example of a method of operating the casting line 1 for a boxless mold according to this embodiment will be described with reference to the drawings.

(Step 1: Casting line transfer step)
After the mold M made by the boxless mold making machine 10 is placed on the platen trolley 16 of the casting line 2 from the carrying-in position 11, the first platen trolley conveying mechanism 13 is activated, and the platen trolley 16 on the casting line 2 is conveyed at a distance . Then, the flat bed trolley 16 moved from the casting line 2 to the movable bed 12 of the second moving bed 5 is fixed by the flat bed trolley fixing mechanism 15 and the stopper mechanism 20 on the movable bed 12 of the second moving bed 5 and Stop on the movable trolley 12.

With reference to the drawings, a specific method of stopping the platen trolley 16 using the platen trolley fixing mechanism 15 and the platen stop mechanism 20 will be described. FIG. 4 shows the positional relationship between the platen trolley fixing mechanism 15 and the platen trolley 16. FIG. 4 shows a part of the hidden line with a broken line. In addition, an imaginary line of the wheel 19 and the axle 19a immediately after the axle 19a contacts the flat-bed trolley fixing mechanism 15 is described by a two-point chain line.
When conveying the distance between the casting lines 2, as shown by an imaginary line, the axle 19 a in the flat bed trolley 16 is in contact with the contact member 15 b in the flat bed trolley fixing mechanism 15. Furthermore, the flatbed trolley 16 is intended to advance further. Here, the flat-bed trolley fixing mechanism 15 is connected to a support structure via the elastic member 15a. The elastic member 15a is formed of, for example, a Neidhart-Gum-Spring, and has elasticity. Therefore, the contact member 15b is displaced by pressing against the axle 19a, and the flat-bed trolley 16 continues to move toward the trolley stopper mechanism 20. Further, when the wheel 19 contacts the trolley stopper mechanism 20, the flat trolley fixing mechanism 15 is restored to its original state by the elasticity of the elastic member 15a (the state shown in FIG. 4). When the platen trolley fixing mechanism 15 returns to its original state, the platen trolley 16 is clamped by the contact member 15b and the platen stopper mechanism 20 as shown in FIG. 4, and is stopped and fixed on the movable platen 12. Specifically, the contact member 15b is brought into contact with the axle 19a, and the trolley stopper mechanism 20 is brought into contact with the wheel 19, so that the flat trolley 16 is stopped and fixed on the movable trolley 12.

(Step 2: Step of moving the second moving platform)
The movable dolly 12 on which the second dolly 5 of the flatbed dolly 16 is placed is moved along the cooling line 3. When the flatbed trolley 16 is placed on the movable dolly 12, the flatbed dolly 16 is fixed to the movable dolly 12 by the contact member 15b and the dolly stopper mechanism 20. Therefore, the flat-bed trolley 16 can be stably positioned on the movable trolley 12.

(Step 3: Cooling line transfer step)
After the movable trolley 12 of the second moving platform 5 moves along the cooling line 3, the second flat-bed trolley transport mechanism 14 is activated, and the flat-bed trolley 16 on the cooling line 3 is conveyed at a distance. At this time, the flatbed trolley 16 moved from the cooling line 3 to the movable trolley 12 of the first moving platform 4 is provided with the flatbed trolley fixing mechanism 15 and the trolley stopper mechanism 20 arranged on the movable trolley 12 of the first moving platform 4. It stops on the movable trolley 12. The structure of the first moving platform 4 is the same as the structure of the second moving platform 5. Specifically, the method of stopping the flat platform 16 using the flat platform fixing mechanism 15 and the platform stop mechanism 20 is the same as that in step 1 described above.

In addition, in the present embodiment, the delivery speed of the flatbed trolley 16 using the first flatbed trolley transport mechanism 13 and the second flatbed trolley transport mechanism 14 is low speed (for example, the previous speed of about 1/5). Therefore, even if a deceleration mechanism such as a buffer cylinder does not exist, the platen trolley 16 can be safely stopped on the movable platen 12 by the platen trolley fixing mechanism 15 and the platen stopper mechanism 20.

(Step 4: Step of moving the first moving platform)
The movable dolly 12 on which the first dolly 4 of the flatbed dolly 16 is placed is moved along the line of the casting line 2. When the flat bed trolley 16 is placed on the movable bed 12, the wheels 19 abut against the bed stopper mechanism 20 and the axle 19 a comes into contact with the flat bed fixing mechanism 15. Therefore, the flat-bed trolley 16 can be stably positioned on the movable trolley 12.

In the above, through steps 1 to 4, a group of flat bed trolleys 16 in this embodiment can be circulated on the casting line 1 for a boxless mold. Next, a procedure for transferring the weight W and the sleeve J existing on the cooling line 3 to the casting line 2 will be described.

(Step 5: Casing Transfer Step)
In a state where the sleeve arm 6A in the sleeve transfer device 6 is closed and hooked on the cooling line 3 and covered with the sleeve flange portion JF on the mold M, the sleeve transfer device 6 is raised . In addition, when the sleeve transfer device 6 is raised, the lower end of the four rod members 23 is matched with the upper end of the sleeve flange portion JF, and the rod member 23 presses the sleeve flange portion JF downward with the sleeve flange JF also rose. Then, after the sleeve transfer device 6 is raised to the rising end, it is moved laterally to the mold M of the casting line 2. While the casing transfer device 6 is being raised, the casing flange portion JF presses the casing lifting claw 6B by the weight of the rod member 23 and the weight. That is, when the sleeve J is moved from the cooling line 3 to the casting line 2, the sleeve flange portion JF is held by the rod member 23 and the sleeve lifting claw 6B, and the sleeve J is fixed to the sleeve transfer device. 6 on.

Next, the sleeve transfer device 6 is lowered to the lower end, and the sleeve J is covered on the mold M on the casting line 2. At this time, the rod member 23 is detached from the sleeve flange portion JF immediately before the sleeve J covers the mold M (immediately before the inner surface of the sleeve J contacts the mold M). That is, the sleeve lifting claw 6B can be easily displaced from the sleeve flange portion JF, and can be easily removed. As described above, although the casing J is configured to be transferred without opening the casing arm 6A, the casing arm 6A is similar to the weight arm 7A and can be opened and closed during the transition.

(Step 6: Weight transfer step)
As the weight arm 7A in the weight transfer device 7 changes from the open state to the closed state, the weight flange portion WF of the weight W placed on the mold M on the cooling line 3 is hooked. Then, the weight W is lifted up by the weight transfer device 7. After the weight transfer device 7 is raised to the rising end, it is moved laterally, thereby moving the weight W to the mold M of the cooling line 3 laterally. Then, the weight transfer device 7 is lowered to the lower end, so that the weight W is placed on the mold M on the casting line 2. Then, when the weight arm 7A is opened, the hook with the weight flange portion WF is released.

As shown in FIGS. 6 and 7, the weight transfer device 7 includes four weight arms 7A, and each of the four weight arms 7A includes a weight lifting claw 7B. The four weight arms 7A use the weight lifting claws 7B to hang the four corners of the weight, so as to raise and lower the weight W. In addition, when the weight lifting claw 7B hangs the four corners of the weight, the position of the weight W is corrected, and then the weight W is lifted.

Here, a method for correcting the weight W using the weight lifting claw 7B will be described using FIG. 9. FIG. 9 is an enlarged view showing a weight lifting claw 7B (including a first engaging member 21 and a second engaging member 22) on one weight arm 7A. Here, it is assumed that the position of the weight W is located closer to the weight lifting claw 7B than the reference position. In this case, when the weight transfer device 7 lifts the weight W on the cooling line 2, the edge portions R1 and R2 of the weight flange portion WF of the weight W abut the inclined surfaces K1 and K2, and the weight arm 7A rises. Therefore, when the weight arm 7A is raised, the position of the weight flange portion WF is corrected so as to return to the reference position. After the correction, the weight flange portion WF is placed on the plane F. In addition, this embodiment has four weight arms 7A, and has the same effect. Therefore, when the weight arm 7A is raised, the position of the weight W which is displaced in an arbitrary direction can be corrected.

Above, through steps 5 and 6, the sleeve J and the weight W on the mold M on the cooling line 3 are transferred to the mold on the casting line 2 by the sleeve transfer device 6 and the weight transfer device 7. M on. In addition, in this embodiment, Step 3 is performed between Step 5 and Step 6. That is, between the implementation of step 5 and step 6, the flatbed trolley 16 on the cooling line 3 performs pitch transmission.

(Step 7: Transfer device returns to step)
After the sleeve transfer device 6 covers the sleeve J on the mold M on the casting line 2, the sleeve arm 6A is detached from the sleeve flange portion JF. In order to perform the following transfer of the sleeve J, the sleeve transfer device 6 does not rise, but moves only in the horizontal direction (direct lateral movement) and moves to the cooling line 3. In addition, after the weight transfer device 7 places the weight W on the mold M on the casting line 2, the weight arm 7A is opened to release the weight W. In order to perform the following transfer of the weight W, the weight transfer device 7 does not rise, but moves only in the horizontal direction (direct lateral movement), and moves to the cooling line 3. This can be achieved by disposing the sleeve arm 6A and the weight arm 7A from the side direction of the casting line 1 for the boxless mold, and disposing it. Even if the sleeve arm 6A is opened, it will not interfere with the weight arm 7A. . Previously, the direction of opening was usually set to be orthogonal for interference. In this case, it has the following structure: When moving in the horizontal direction, if the casing arm and the weight arm are not raised, it will collide with a mold. M. Another reason is that, since the mold M on the casting line 2 and the mold M on the cooling line 3 are located in the same position in the conveying direction, even if the sleeve arm 6A and the open weight arm 7A are moved in the horizontal direction, It also moves between the mold M, the sleeve J or the weight W, and can move without collision.

In addition, the casing transfer device 6 and the weight transfer device 7 of the present embodiment are integrated as a casing weight transfer device 8 by connecting the frame 9. In addition, the movement of the casing transfer device 6 and the weight transfer device 7 in the raising and lowering directions is performed by the lifting cylinder 17, and the movement in the lateral direction is performed by moving the cylinder 18 laterally. That is, the casing transfer step (step 5) and the weight transfer step (step 6) are performed simultaneously. In addition, the movement of the casing weight transfer device 8 in the raising and lowering direction and the movement in the lateral direction are performed by one cylinder, respectively.

The operation and effect of the casting line 1 for a boxless mold according to this embodiment will be described below.
The casing transfer device 6 and the weight transfer device 7 are integrated by a connection frame 9. Further, the movement in the raising and lowering direction of the casing transfer device 6 and the weight transfer device 7 is performed by a lifting cylinder 17, and the lateral movement is performed by a lateral movement cylinder 18. That is, the movement in the raising and lowering direction and the movement in the lateral direction of the two devices are performed by using one cylinder, respectively. Therefore, compared with the case where the casing transfer device 6 and the weight transfer device 7 respectively include a lifting cylinder 17 and a laterally moving cylinder 18, the weight of the equipment can be reduced, and the equipment cost can be reduced.

In addition, as the number of cylinders decreases, the number of various sensors that measure the speed of the cylinders can also decrease. By reducing the number of various sensors, the wiring of the control panel can be reduced, so the control panel itself can also be reduced.

The flat-bed trolley 16 that performs pitch transmission on the casting line 2 and the cooling line 3 is stopped by the flat-bed trolley fixing mechanism 15 and the trolley stop mechanism 20. In a conventional casting line for a boxless mold, a method for stopping a flat-bed trolley with spaced-apart conveyance is generally performed by using a buffer cylinder. However, buffer cylinders usually require power such as oil pressure. On the other hand, the flat-bed trolley fixing mechanism 15 and the trolley stop mechanism 20 do not require power. In addition, compared with the buffer cylinder, the equipment cost can be reduced. Therefore, since the casting line 1 for a boxless mold of this embodiment does not require power, it contributes to a reduction in operating costs and a reduction in equipment costs.

After the sleeve transfer device 6 covers the sleeve on the mold M on the casting line 2, it moves only in the horizontal direction without rising and moves to the cooling line 3. In addition, after the weight transfer device 7 places the weight W on the mold M on the casting line 2, the weight transfer device 7 moves in the horizontal direction without moving up, and moves to the cooling line 3.

Here, the operations of the prior art casing transfer device and the weight transfer device are compared with the operations of the casing transfer device 6 and the weight transfer device 7 of the present invention.

In the prior art, the sleeve transfer device performs one cycle in the order described below after grasping the sleeve covering the mold on the cooling line.
Step 1: Raise the casing on the cooling line.
Step 2: Move the sleeve laterally from the cooling line to the casting line.
Step 3: Lower the casing on the casting line.
Step 4: Cover the sleeve on the mold on the casting line.
Step 5: Ascend on the casting line.
Step 6: Move laterally from the casting line to the cooling line.
Step 7: Drop on the cooling line.
Step 8: Grab the sleeve covering the mold on the cooling line.
In addition, in the prior art, the weight transfer device is one cycle in the order described below after the weight transfer on the cooling line is grasped by the weight.
Step 1: Raise the weight on the cooling line.
Step 2: Move the weight laterally from the cooling line to the casting line.
Step 3: Lower the weight on the casting line.
Step 4: Place the weight on the mold on the casting line.
Step 5: Ascend on the casting line.
Step 6: Move laterally from the casting line to the cooling line.
Step 7: Drop on the cooling line.
Step 8: Grasp the sleeve placed on the mold on the cooling line.

On the other hand, the sleeve transfer device 6 according to the present invention performs one cycle in the order described below after grasping the sleeve J covering the mold M on the cooling line.
Step 1: Raise the casing J on the cooling line 3.
Step 2: The sleeve J is moved laterally from the cooling line 3 to the casting line 2.
Step 3: Lower the casing J on the casting line 2.
Step 4: Cover the sleeve J on the mold M on the casting line 2.
Step 5: Move laterally from the casting line 2 to the cooling line 3.
Step 6: Grab the sleeve J covering the mold M on the cooling line 2.
In addition, the weight transfer device 7 in the present invention is one cycle after the weight W placed on the mold M on the cooling line 3 is grasped, and is performed in the order described below.
Step 1: Raise the weight W on the cooling line 3.
Step 2: The weight W is moved laterally from the cooling line 3 to the casting line 2.
Step 3: Lower the weight W on the casting line 2.
Step 4: Place the weight W on the mold M on the casting line 2.
Step 5: Move laterally from the casting line 2 to the cooling line 3.
Step 6: Hold the sleeve J placed on the mold M on the cooling line 3.

In the casing transfer device 6 of the present invention, steps 5 and 7 can be deleted from the above steps 1 to 8 of the prior art casing transfer device. Similarly, the weight transfer device 7 of the present invention can delete steps 5 and 7 from the above steps 1 to 8 of the prior art casing transfer device. That is, compared with the previous, the time taken for each step becomes shorter.

The cylinder used in the prior art casing weight transfer equipment can usually change the telescopic speed in a plurality of stages by using a speed controller and a switching valve. As a result, compared with the case where the expansion and contraction speed of the cylinder is only one speed, the time taken to move the casing transfer device and the weight transfer device by the expansion and contraction of the cylinder can be reduced.

However, the use of a speed controller and a switching valve increases equipment costs. In addition, the speed controller and the switching valve also need piping or wiring, which also consumes the equipment costs. Furthermore, considering the load applied to the casing weight transfer device when the expansion and contraction speed of the cylinder is changed, it is necessary to design the frame of the casing weight transfer device.

The expansion and contraction speeds of the lifting cylinder 17 and the lateral movement cylinder 18 in the present invention are set to only 1 speed (low speed to the extent that no load is applied to the casing weight transfer device 8). Therefore, the configuration of a multi-speed transmission circuit such as a two-speed circuit is not required, and the required piping or wiring can be reduced. For example, in the case of a two-speed circuit, two switching valves are required for each cylinder, but in the case of a one-speed circuit, only one switching valve is required for each cylinder. Thereby, the equipment cost of the casing weight transfer device 8 can be reduced. The "1-speed" here means that the expansion and contraction speed set for the cylinder is only one.

In addition, since the expansion and contraction speed of the lifting cylinder 17 and the lateral movement cylinder 18 is 1 speed, the load on the casing weight transfer device 8 caused by the change of the expansion and contraction speed of the lifting cylinder 17 and the lateral movement cylinder 18 does not exist. Therefore, it can be set to a lower strength than the frame of the existing casing weight transfer equipment. Accordingly, the structure of the frame can be simplified, so that the weight of the casing weight transfer device 8 can be reduced. Therefore, the manufacturing cost of the casing weight transfer device 8 can be reduced.

In addition, in this embodiment, the increase in the step time caused by setting the expansion and contraction speeds of the lift cylinder 17 and the lateral movement cylinder 18 to 1 speed is due to the steps of the casing transfer device 6 and the weight transfer device 7 described above. The reduction in step time caused by the number reduction is offset. That is, in the casting line for the boxless mold, the timing of the interval transmission is consistent with the time for casting the molten soup into the mold, and there is no substantial advantage in easily accelerating the processing time. It is meaningful to reduce the cost of equipment by reducing the time of one step to the full use of other steps.

The casing transfer device 6 and the weight transfer device 7 are integrated with each other by the connection frame 9 and are close to each other. On the other hand, the opening and closing direction of the weight arm 7A is a direction horizontal to the casting line 2 and the cooling line 3. Therefore, depending on the situation, when the weight arm 7A is opened, there is a concern that the sleeve arm 6A is in contact with the weight arm 7A. Therefore, as shown in FIG. 7, the sleeve arm 6A included in the sleeve transfer device 6 and the weight arm 7A included in the weight transfer device 7 are staggered in their opening and closing directions and the vertical direction. Therefore, when the weight arm 7A is opened, the sleeve arm 6A and the weight arm 7A do not contact each other.

When the sleeve J is covered on the mold M on the casting line 2, if the inner surface of the sleeve J contacts the mold M in a state where the rod member 23 abuts on the sleeve J, there is a mold misalignment in the mold M. Situation. The reason is that, in a state where the casing J is fixed on the casing transfer device 6, the casing J presses the mold M with an unreasonable force.
According to this embodiment, the rod member 23 in the casing transfer device 6 is adjusted in length as follows: at the casing transfer step, on the casting line 2, immediately before the casing J is covered on the mold M (the casing J The inner surface immediately before contacting the mold M) is detached from the sleeve flange JF. In other words, the length is adjusted so that when the rod member 23 moves to the lowest point, the lower end becomes the height above the upper end of the sleeve J. Therefore, for example, even if the position of the sleeve J with respect to the mold M is misplaced, the sleeve J will not press the mold M with an unreasonable force on the inner surface, and it can cover the mold M while following the shape of the mold M.

With the casting line for the boxless mold of the present invention, the weight of the entire equipment constituting the casting line for the boxless mold can be reduced. In addition, by reducing the overall weight of the device, the size of the actuator can be reduced, and the operating cost of the actuator can be reduced. Furthermore, the operation cost can be reduced by reducing the number of steps. Furthermore, by reducing the number of actuators, it is possible to reduce the weight of the casting line for the boxless mold and reduce the running cost.

Hereinafter, the main symbols used in this specification and drawings are summarized and shown.

1‧‧‧Casting Line for Boxless Mold

2‧‧‧casting line

3‧‧‧ cooling line

4‧‧‧The first moving platform

5‧‧‧Second transfer platform

6‧‧‧ Casing Transfer Device

6A‧‧‧Sleeve arm

7‧‧‧ weight transfer device

7A‧‧‧Hammer arm

7B‧‧‧Hammer lifting claw

K1, K2‧‧‧inclined surface

8‧‧‧ Casing hammer transfer equipment

12‧‧‧ movable trolley

13‧‧‧The first transfer trolley transfer mechanism

14‧‧‧Second transfer trolley transfer mechanism

15‧‧‧ Flat trolley fixing mechanism

15a‧‧‧elastic member

15b‧‧‧contact member

16‧‧‧ flat trolley

17‧‧‧ Lifting cylinder

18‧‧‧ Horizontal movement cylinder

19‧‧‧ Wheel

19a‧‧‧ axle

20‧‧‧Trolley stop mechanism

21‧‧‧First engaging member

22‧‧‧Second engagement member

23‧‧‧ rod member

W‧‧‧ Heavy Hammer

J‧‧‧ Casing

M‧‧‧Mould

FIG. 1 is a plan view of a casting line for a boxless mold according to an embodiment of the present invention.

FIG. 2 is a schematic view of a second moving platform and a second flat platform conveying mechanism according to an embodiment of the present invention when viewed from a plane.

FIG. 3 is a schematic view of a second moving platform and a second flat platform conveying mechanism according to an embodiment of the present invention, as viewed from the front.

FIG. 4 is an enlarged view of the flat trolley fixing mechanism of FIG. 3.

5 is a plan view of a casing weight transfer device according to an embodiment of the present invention.

6 is a front view of a casing weight transfer device according to an embodiment of the present invention.

FIG. 7 is an A-A arrow view of the casing weight transfer device of FIG. 6. FIG.

FIG. 8 is a schematic view of each component being exploded in order to show the shape of a part of the weight arm, the first engaging member, and the second engaging member. (A) is a schematic view viewed from the front of FIG. 6, and (B) is a right side view of (A).

FIG. 9 is a schematic diagram of a dotted line DL in FIG. 6. (A) is a front view of the first engagement member, and (B) is a side view of the first engagement member and the second engagement member.

FIG. 10 is a schematic diagram of a flat-bed trolley used in a casting line for a boxless mold according to an embodiment of the present invention. (A) is a side view, (B) is a front view, and (C) is a plan view.

Claims (14)

The utility model relates to a casting line for a boxless casting mold, which comprises a casting line and a cooling line for conveying a flat plate trolley on which a casting mold is placed, and is characterized by comprising: A casing transfer device comprising a plurality of casing arms for lifting a casing, and transferring the casing covering the mold in the cooling line to the mold disposed on the casting line; and The weight transfer device includes a plurality of weight arms that lift the weight, and transfers the weight placed on the mold in the cooling line to the mold disposed on the casting line; It also includes a lifting cylinder that moves the casing transfer device and the weight transfer device as a whole in the vertical direction; and The lateral movement cylinder moves the sleeve transfer device and the weight transfer device as a whole in a lateral direction. For example, the casting line for boxless molds in the scope of patent application No. 1 includes: The first moving platform and the second moving platform are configured by connecting one end and the other end of the above-mentioned casting line and the above-mentioned cooling line respectively, and placing the above-mentioned flat-bed trolley to move it; A first plate trolley conveying mechanism, which is arranged at one end of the casting line and transfers the plate trolley placed on the first moving platform to the casting line; and A second plate trolley conveying mechanism, which is arranged at the other end of the cooling line and transfers the plate trolley placed on the second moving platform to the cooling line; The first moving platform and the second moving platform include: A movable trolley, which carries the flat trolley and moves between the casting line and the cooling line; A trolley stopper mechanism that abuts the mounted trolley, and a trolley fixing mechanism that abuts the trolley from an opposite side to the trolley stopper; and The pallet stopper mechanism and the flat pallet fixing mechanism are used to clamp and fix the placed flat pallet to the movable pallet. For example, the casting line for boxless molds in the scope of patent application No. 2 The above-mentioned flat trolley is equipped with wheels and axles, and The stopper mechanism of the trolley is in contact with the wheels of the flat trolley, and the fixation mechanism of the trolley is in contact with the axle of the flat trolley. For example, the casting line for boxless molds in the scope of patent application No. 3, where The flat trolley fixing mechanism has a contact member that abuts against the axle, and an elastic member that displaceably supports the contact member. Even if it abuts against the axle, the contact member is also displaced, and the flat trolley is movable When the wheel abuts on the trolley stop mechanism, the contact member abuts on the axle from the side opposite to the trolley stop mechanism, and the flat trolley is fixed on the movable trolley. For example, the casting line for boxless molds in the scope of patent application item 1, where The weight arm includes a weight lifting claw, which is engaged with the weight when lifting the weight, and The weight lifting claw is detachably mounted on the weight arm. For example, the casting line for boxless molds in the scope of patent application No. 5 The weight lifting claw has an inclined surface that corrects the position of the weight when the weight is lifted. For example, the casting line for boxless molds in the scope of patent application No. 6 The weight lifting claw includes: a first engaging member that is detachably mounted on the weight arm; and a second engaging member that is detachably mounted on the first engaging member. on. For example, the casting line for boxless molds in the scope of patent application item 1, where The casing transfer device further includes a plurality of rod members extending in the height direction of the mold and movable in the vertical direction; and The lower end of the rod member is arranged so as to be in contact with the sleeve. For example, the casting line for boxless molds in the scope of patent application No. 8 The length of the rod member is adjusted so that the lower end becomes the height above the upper end of the sleeve when the rod member is moved to the lowest point. For example, the casting line for boxless molds in the scope of patent application item 1, where The weight arm is opened and closed in a direction parallel to the proceeding direction of the casting line and the cooling line, and the sleeve arm and the weight arm are displaced in a direction perpendicular to the opening and closing direction of the weight arm. For example, the casting line for boxless molds in the scope of patent application item 1, where The plate member on which the plate trolley is placed is formed of a steel plate. A method for operating a casting line for a boxless casting mold in the scope of patent application No. 1 is characterized in that it includes: The sleeve transfer step uses the sleeve transfer device to remove the sleeve covered on the mold in the cooling line and cover the mold disposed on the casting line; The weight transfer step uses the weight transfer device to lift the weight disposed on the mold in the cooling line and place the weight on the mold disposed on the casting line; and The transfer device returns to the step of moving the sleeve transfer device and the weight transfer device from the casting line to the cooling line; and The sleeve transfer device and the weight transfer device in the returning step of the transfer device move from the casting line to the cooling line by moving only in the horizontal direction. For example, the method for operating a casting line for a boxless mold in the scope of patent application No. 12 in which In the casting line for the boxless mold, The above-mentioned flat trolley is equipped with wheels and axles, and It also includes: a first moving platform and a second moving platform, which are arranged in such a way that one end and the other end of the above-mentioned casting line and the above-mentioned cooling line are connected respectively, and the flat-bed trolley is placed to move it; A first plate trolley conveying mechanism, which is arranged at one end of the casting line and transfers the plate trolley placed on the first moving platform to the casting line; and A second plate trolley conveying mechanism, which is arranged at the other end of the cooling line and transfers the plate trolley placed on the second moving platform to the cooling line; The first moving platform and the second moving platform include: A movable trolley, which carries the flat trolley and moves between the casting line and the cooling line; For the above-mentioned placed flat trolley, a stop mechanism of the trolley contacting the wheels of the flat trolley and a fixing mechanism of the flat trolley contacting the axle; The operation method of the casting line for the boxless mold further includes: The casting line transfer step uses the above-mentioned first flat-bed trolley transfer mechanism to transfer the flat-bed trolleys placed on the first moving platform and the casting line at a distance; A second moving platform moving step, moving the movable platform in the second moving platform from one end side of the casting line to one end side of the cooling line; The cooling line transfer step uses the above-mentioned second flat-bed trolley transfer mechanism to carry out the pitch transfer of the flat-bed trolleys placed on the second moving platform and the cooling line; and A first moving platform moving step, moving the movable platform in the first moving platform from the other end side of the cooling line to the other end side of the casting line side; and The flat trolleys transferred to the first moving platform and the second moving platform through the casting line transferring step and the cooling line transferring step are used to transfer the wheels by using the flat trolley fixing mechanism and the trolley stopping mechanism. And the axle is clamped, so as to be fixed on the movable trolley in the first moving platform and the second moving platform. For example, the method for operating a casting line for a boxless mold in the scope of patent application No. 12 in which Each of the lifting cylinder and the laterally moving cylinder moves at only one telescopic speed.