Carrying implement and component replacing method

Abstract

To provide a carrying implement capable of reducing a work burden when a component of a machine is replaced.SOLUTION: A carrying implement includes: a first carriage that has a plurality of first wheels, a first chassis on which the plurality of first wheels are provided, a first frame to which the first chassis is attached, and a first load carrying platform attached to the first frame so as to be located at the opposite side to the first chassis; and a second carriage that has a plurality of second wheels, a second chassis on which the plurality of second wheels are provided, a second frame to which the second chassis is attached, and a second load carrying platform attached to the second frame so as to be located at the opposite side to the second chassis. A carried object is loaded on either one of the first load carrying platform or the second load carrying platform facing with each other and located at the lower side in a vertical direction. The first carriage and the second carriage are connected to each other in such a way that either one of the plurality of first wheels or the plurality of second wheels located at the lower side contacts the ground, and the other one located at the upper side is located above the first load carrying platform and the second load carrying platform. The carried object is thus carried in this state.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a conveying tool used for conveying an object to be conveyed, and a method for replacing parts that replaces parts of a machine using this conveying tool.

Background Art

[0002] Chips of devices such as ICs (Integrated Circuits) are essential components in various electronic devices such as mobile phones and personal computers. Such chips are manufactured, for example, by grinding the back surface of a wafer on which a plurality of devices are formed on the front surface side, and then dividing the wafer along the boundaries of the plurality of devices.

[0003] A grinding device for grinding the back surface side of a wafer generally includes a chuck table for holding the front surface side of the wafer, and a spindle having a grinding wheel including a plurality of grinding wheels arranged annularly and discretely mounted at its tip. Then, the grinding of the back surface side of the wafer in this grinding device is performed by pressing a plurality of grinding wheels against the back surface side of the wafer while rotating both the chuck table for holding the front surface side of the wafer and the spindle at high speed.

[0004] When grinding the back surface side of the wafer in this way, the spindle is often held by an air bearing so as not to move the spindle from a desired position. However, when the centrifugal force acting on the spindle due to high-speed rotation or the pressing force acting on the spindle due to grinding of the back surface side of the wafer becomes excessive, the spindle may move from the desired position and contact the housing or the like.

[0005] When the spindle is damaged due to this contact, the rotation axis of the high-speed rotating spindle may wobble, making it difficult to grind the back side of the wafer with the desired machining accuracy. Therefore, in such a case, it is necessary to replace the spindle of the grinding device. However, generally, the spindle has a weight of 150 kg to 200 kg, and the replacement work is laborious.

[0006] For example, in order to replace the spindle (defective product) of the grinding device with another spindle (non-defective product), it is necessary to perform: (1) packing of the non-defective product, (2) loading the packed non-defective product onto a trolley, (3) transporting the trolley loaded with the non-defective product to the vicinity of the grinding device, (4) unpacking the non-defective product transported to the vicinity of the grinding device, (5) removing the defective product from the grinding device, (6) attaching the non-defective product loaded on the trolley to the grinding device, (7) packing the defective product removed from the grinding device, (8) loading the packed defective product onto a trolley, and (9) transporting the trolley loaded with the defective product away from the vicinity of the grinding device.

[0007] Such laboriousness may occur not only when replacing the spindle of the grinding device but also when replacing parts of other machines. Therefore, in order to reduce the laboriousness of replacing parts of a machine, a transport and packing device in which a packing member and a trolley for transporting the packing member are integrated has been proposed (see, for example, Patent Document 1). Specifically, by using this transport and packing device as a trolley, the above two steps (1) and (2) can be combined into one, and the above two steps (7) and (8) can be combined into one.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] Before the step (5) described above, the step (6) described above cannot be performed. That is, if the part to be replaced (the part to be exchanged) has not been removed from the machine, the part to be exchanged with this part (the replacement part) cannot be attached to the machine. Therefore, the part to be exchanged removed from the machine is often temporarily placed without being directly loaded onto the cart loaded with the replacement parts, or is loaded onto another cart different from this cart.

[0010] However, when the part to be exchanged is temporarily placed, it takes the trouble of loading the part to be exchanged onto the cart after attaching the replacement part to the machine. Also, when the part to be exchanged is loaded onto another cart, it takes the trouble of transporting another cart to the vicinity of the machine together with the cart for transporting the replacement part, or preparing another cart in the vicinity of the machine in advance.

[0011] In view of these points, an object of the present invention is to provide a conveying tool capable of reducing the labor when replacing parts of a machine, and a method for replacing parts that uses this conveying tool to replace the parts of the machine so as to reduce the labor.

Means for Solving the Problem

[0012] According to one aspect of the present invention, there is provided a conveying tool used for conveying an object to be conveyed, comprising: a first cart having a plurality of first wheels, a first chassis on which the plurality of first wheels are provided, a first frame to which the first chassis is attached, and a first loading platform attached to the first frame so as to be located on the opposite side of the first chassis; and a second cart having a plurality of second wheels, a second chassis on which the plurality of second wheels are provided, a second frame to which the second chassis is attached, and a second loading platform attached to the second frame so as to be located on the opposite side of the second chassis. The object to be conveyed is loaded on the lower one of the first loading platform and the second loading platform facing each other in the vertical direction, and the lower one of the plurality of first wheels or the plurality of second wheels is grounded, and the upper one of them is located above the first loading platform and the second loading platform. A conveying tool for conveying the object to be conveyed in a state where the first cart and the second cart are connected is provided.

[0013] Preferably, the first bogie and the second bogie are connected such that the plurality of first wheels are positioned below the plurality of second wheels. The first frame is equipped with legs that can be moved to be positioned in either an immovable self-supporting position that lifts the grounded plurality of first wheels or a transportable position that re - grounds the floating plurality of first wheels. Also preferably, the conveying tool can be changed from a first available state in which the first chassis is mounted on the first frame so as to position the first chassis between the plurality of first wheels and the first loading platform in the vertical direction to a first storage state in which the first chassis is mounted on the first frame so as to position the plurality of first wheels between the first chassis and the first loading platform, and can be changed back from the first storage state to the first available state. Similarly, the second chassis can be changed from a second available state in which the second chassis is mounted on the second frame so as to position the second chassis between the plurality of second wheels and the second loading platform in the vertical direction to a second storage state in which the second chassis is mounted on the second frame so as to position the plurality of second wheels between the second chassis and the second loading platform, and can be changed back from the second storage state to the second available state. Further preferably, it further includes a cover that is mounted on at least one of the first frame or the second frame and surrounds at least a part of the side surface of the object to be conveyed when conveying the object to be conveyed. Additionally, preferably, each of the first loading platform and the second loading platform is replaceable.

[0014] According to another aspect of the present invention, there is provided a method for replacing parts of a machine, using a conveying tool including: a first carriage having a plurality of first wheels, a first chassis on which the plurality of first wheels are provided, a first frame to which the first chassis is attached, and a first loading platform attached to the first frame so as to be located on the opposite side of the first chassis; and a second carriage having a plurality of second wheels, a second chassis on which the plurality of second wheels are provided, a second frame to which the second chassis is attached, and a second loading platform attached to the second frame so as to be located on the opposite side of the second chassis. The method includes: a first conveying step of conveying the conveying tool, which is configured by connecting the first carriage and the second carriage such that the replacement parts are stacked on the first loading platform located below the first loading platform and the second loading platform facing each other in the vertical direction, the plurality of first wheels are grounded, and the plurality of second wheels are located above the first loading platform and the second loading platform, to a position where the replacement parts can be attached to the machine; a separating step of separating the first carriage and the second carriage after the first conveying step; a removing step of removing the part to be replaced from the machine and loading it on the second loading platform after the separating step; an attaching step of attaching the replacement parts stacked on the first loading platform to the machine after the removing step; a connecting step of configuring the conveying tool by connecting the first carriage and the second carriage such that the part to be replaced is stacked on the second loading platform located below the first loading platform and the second loading platform facing each other in the vertical direction, the plurality of second wheels are grounded, and the plurality of first wheels are located above the first loading platform and the second loading platform after the attaching step; and a second conveying step of conveying the conveying tool from the position after the connecting step. [Effect of the Invention]

[0015] The conveying tool of the present invention includes a first carriage and a second carriage, and conveys an object to be conveyed with the first carriage and the second carriage connected. When replacing parts of a machine using this conveying tool, after loading the part to be replaced removed from the machine onto the second carriage separated from the first carriage on which the replacement parts are stacked, the replacement parts stacked on the first carriage can be attached to the machine.

[0016] That is, in this case, the replaceable part removed from the machine can be loaded onto the second cart without being temporarily placed. Also, since this second cart is a component of the conveyance tool used for conveying the replacement part, there is no need to convey another cart to the vicinity of the machine together with this conveyance tool or to prepare another cart in the vicinity of the machine in advance. Therefore, by using the conveyance tool of the present invention to replace the parts of the machine, it is possible to reduce the labor involved.

Brief Description of the Drawings

[0017]

Figure 1

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Figure 17

DETAILED DESCRIPTION OF THE INVENTION

[0018] Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view schematically showing an example of a conveying tool. The conveying tool 2 shown in FIG. 1 is configured, for example, by connecting two carts 4 and 6 such that one of them (for example, cart 6) is positioned above the other (for example, cart 4).

[0019] The two carts 4 and 6 have, for example, the same structure as each other. FIG. 2 is a front view schematically showing each of the carts 4 and 6, and FIG. 3 is a plan view schematically showing each of the carts 4 and 6. Further, FIG. 4 is a cross-sectional view showing a cross-section along the chain line IV-IV of each of the carts 4 and 6 shown in FIG. 2.

[0020] Each of the carriages 4 and 6 has a plurality (for example, four) of casters 8. Each caster 8 includes a wheel 8a and a support 8b that supports the wheel 8a in a rotatable manner. And the support 8b of each caster 8 is attached to the chassis 10 using a fixture (not shown) such as a bolt.

[0021] This chassis 10 is, for example, a square plate in plan view. Specifically, the chassis 10 includes a pair of bottom surfaces 10a and 10b that are each square and parallel to each other, a pair of side surfaces 10c and 10d that are perpendicular to the pair of bottom surfaces 10a and 10b and parallel to each other, and a pair of side surfaces 10e and 10f that are perpendicular to the pair of bottom surfaces 10a and 10b and the pair of side surfaces 10c and 10d and parallel to each other.

[0022] Also, each caster 8 is attached to the bottom surface 10a of the chassis 10 such that one end thereof contacts the side surface 10c or the side surface 10d in plan view and is separated from each of the pair of side surfaces 10e and 10f. That is, each caster 8 is not attached to the region of the bottom surface 10a of the chassis 10 that is close to the pair of side surfaces 10e and 10f.

[0023] And the chassis 10 is attached to the frame 12 using a fixture (not shown) such as a bolt. Specifically, the frame 12 has a mounted portion 14 that includes a pair of H-shaped bottom surfaces 14a and 14b that are parallel to each other in plan view. And the chassis 10 is attached to the mounted portion 14 of the frame 12 with its bottom surface 10b in contact with the bottom surface 14a, for example.

[0024] Also, one end of each of a plurality (for example, four) of prism portions 16 is fixed to the bottom surface 14b of the mounted portion 14. Each prism portion 16 is provided so as to overlap with one of the plurality of casters 8 via the chassis 10 and the mounted portion 14 when the chassis 10 is attached to the mounted portion 14 such that the region of the bottom surface 10b of the chassis 10 that is close to the pair of side surfaces 10c and 10d contacts the bottom surface 14a of the mounted portion 14.

[0025] Also, the other ends of the respective prism portions 16 are fixed to the base portion 18. This base portion 18 is a square plate having a circular opening 18a formed at its center in plan view. In other words, the base portion 18 has a square shape with an opening 18a formed at each center, and has a pair of bottom surfaces 18b, 18c parallel to each other. And the other ends of the respective prism portions 16 are fixed to the bottom surface 18b of the base portion 18.

[0026] Furthermore, the base portion 18 has a pair of side surfaces 18d, 18e perpendicular to and parallel to each other on the pair of bottom surfaces 18b, 18c. And a connecting portion 20 is provided in a region of the bottom surface 18c of the base portion 18 close to the side surface 18d, and a groove 18f is formed in a region close to the side surface 18e.

[0027] This connecting portion 20 has a convex shape in front view, that is, a shape in which the width of its tip is narrower than the width other than the tip. Also, the connecting portion 20 has an outer side surface 20a and an inner side surface 20b perpendicular to and parallel to each other on the bottom surface 18c of the base portion 18. Note that a handle for facilitating the conveyance of the conveying tool 2 or each of the carts 4, 6 may be provided on the outer side surface 20a of the connecting portion 20. Also, the groove 18f formed in the base portion 18 has a shape corresponding to the tip of the connecting portion 20.

[0028] Then, the two carts 4, 6 are connected by opposing the inner side surfaces 20b of the respective connecting portions 20 to each other and fitting the tips of the respective connecting portions 20 into the grooves 18f formed in the base portions 18 of each other. Furthermore, the tip of the connecting portion 20 fitted into the groove 18f may be attached to the base portion 18 using a fixture (not shown) such as a bolt.

[0029] In addition, a loading platform 22 is mounted on the frame 12 so as to be located on the opposite side of the chassis 10. Specifically, this loading platform 22 is mounted on a central region of the bottom surface 18c of the base portion 18, which is located between the connecting portion 20 and the groove 18f, by using fixtures (not shown) such as bolts. Further, the loading platform 22 is made of a flexible material such as rubber, for example, and has a circular shape, that is, an annular shape, in which a circular opening 22a is formed at its center in plan view.

[0030] Note that the diameter of the opening 22a formed in the loading platform 22 is larger than the diameter of the opening 18a formed in the base portion 18. And the loading platform 22 is mounted on the base portion 18 so that the center of the opening 22a and the center of the opening 18a overlap in plan view. Note that structures for aligning the positions of the base portion 18 and the loading platform 22 may be provided on each of them.

[0031] For example, a convex portion or a concave portion may be formed on the bottom surface 18c of the base portion 18, and a concave portion or a convex portion having a shape corresponding to this convex portion or concave portion may be formed on the loading platform 22. And when mounting the loading platform 22 on the base portion 18, the convex portion or convex portion formed on the bottom surface 18c of the base portion 18 may be fitted into the concave portion or convex portion formed on the loading platform 22, thereby aligning the positions of the two.

[0032] The above-described conveying tool 2 is used, for example, for conveying an object to be conveyed such as a spindle of a grinding device. FIG. 5 is a side view schematically showing the conveying tool 2 with the spindle 24 loaded thereon. In this conveying tool 2, the wheels 8a of the casters 8 of the lower one (for example, the cart 4) among the two carts 4 and 6 are grounded, and the spindle 24 is conveyed in a state where the upper one (for example, the cart 6) among them is located above the loading platform 22 of each of the carts 4 and 6.

[0033] The spindle 24 is loaded on the loading platform 22 of the carriage 4 in a state where it is partially inserted into the opening 22a formed in the loading platform 22 of the carriage 4 and the opening 18a formed in the base portion 18. In other words, the spindle 24 loaded on the conveying tool 2 has its wide portion supported by the loading platform 22 of the carriage 4, and its narrow portion is positioned in the opening 22a formed in the loading platform 22 of the carriage 4, the opening 18a formed in the base portion 18, and the space below the base portion 18 and above the mounted portion 14.

[0034] Also, the spindle 24 loaded on the loading platform 22 may be fixed to at least one of the two carriages 4 and 6 using a rope, a belt, or the like (not shown). For example, the spindle 24 may be fixed to the loading platform 22 by tying a rope so that the force pressing the spindle 24 against the loading platform 22 acts on the spindle 24 from the rope passed through the rope hole (not shown) formed in the base portion 18.

[0035] FIG. 6 is a flowchart schematically showing an example of a spindle replacement method for replacing the spindle 24 of the grinding device using the conveying tool 2. Also, each of FIGS. 7(A), 7(B), 8(A), 8(B), 9(A), and 9(B) is a diagram schematically showing the state of each step included in this method.

[0036] Briefly, in this method, the conveying tool 2 is used to replace the non-defective product (replacement part) 24a of the spindle 24 with the defective product (part to be replaced) 24b provided in the grinding device 26. And in this method, one of the two carriages 4 and 6 provided in the conveying tool 2 (for example, the carriage 4) is used for conveying the replacement part 24a, and the other (for example, the carriage 6) is used for conveying the part to be replaced 24b.

[0037] Specifically, in this method, first, a transport tool 2 configured by connecting a cart 6 (hereinafter also referred to as the "second cart") above a cart 4 (hereinafter also referred to as the "first cart") with a replacement part 24a loaded on its loading platform 22 is transported to the vicinity of a grinding device 26 (specifically, a position where the replacement part 24a can be attached to the grinding device 26) (first transport step S1) (see Fig. 7(A)).

[0038] In the first transport step S1, the replacement part 24a is transported in a state where the loading platforms 22 face each other in the vertical direction, the wheels 8a of each caster 8 of the first cart are grounded, and the wheels 8a of each caster 8 of the second cart are positioned above the respective loading platforms 22 of the first cart and the second cart, with the first cart and the second cart connected to each other.

[0039] Next, the first cart and the second cart are separated (separation step S2) (see Fig. 7(B)). Then, the part to be replaced 24b is removed from the grinding device 26 and loaded onto the loading platform 22 of the second cart (removal step S3) (see Fig. 8(A)). Next, the replacement part 24a loaded on the loading platform 22 of the first cart is attached to the grinding device 26 (attachment step S4) (see Fig. 8(B)). Next, the transport tool 2 is configured by connecting the first cart above the second cart (connection step S5) (see Fig. 9(A)). Next, the transport tool 2 is transported from the vicinity of the grinding device 26 (second transport step S6).

[0040] In the second transport step S6, the part to be replaced 24b is transported in a state where the loading platforms 22 face each other in the vertical direction, the wheels 8a of each caster 8 of the second cart are grounded, and the wheels 8a of each caster 8 of the first cart are positioned above the respective loading platforms 22 of the first cart and the second cart, with the first cart and the second cart connected to each other.

[0041] The above-described conveying tool 2 includes a first cart and a second cart, and conveys the spindle 24 with the first cart and the second cart being connected. When replacing the spindle 24 using this conveying tool 2, after loading the defective product (the part to be replaced) 24b removed from the grinding device 26 onto the second cart separated from the first cart loaded with the non-defective product (replacement part) 24a, the replacement part 24a loaded on the first cart can be attached to the grinding device 26.

[0042] That is, in this case, the part to be replaced 24b removed from the grinding device 26 can be loaded onto the second cart without temporarily placing it. Further, since this second cart is a component of the conveying tool 2 used for conveying the replacement part 24a, it is not necessary to convey another cart to the vicinity of the grinding device 26 together with this conveying tool 2, or to prepare another cart in the vicinity of the grinding device 26 in advance. Therefore, by replacing the spindle 24 of the grinding device 26 using the conveying tool 2, it is possible to reduce the labor involved.

[0043] Note that the above-described content is one aspect of the present invention, and the present invention is not limited to the above-described content. For example, in the present invention, each caster 8 may be replaced with a single wheel 8a. That is, in the present invention, the wheel 8a may be attached to the chassis 10 in a rotatable manner, or may be attached to the chassis 10 in a non-rotatable manner.

[0044] When the wheel 8a is attached to the chassis 10 in a rotatable manner, it is preferable in terms of improving the operability of the conveying tool 2. On the other hand, when the wheel 8a is attached to the chassis 10 in a non-rotatable manner, it is preferable in terms of simplifying the structure of the conveying tool 2 and reducing its manufacturing cost.

[0045] Also, in the present invention, there is no limitation on the shape of the chassis. For example, the chassis adopted in the present invention may be square in plan view like the chassis 10, or may be lattice-shaped in plan view, for example.

[0046] When the chassis adopted in the present invention is in a lattice shape in plan view, it is preferable in that the conveying device 2 is lightened. On the other hand, when the chassis adopted in the present invention is the chassis 10, it is preferable in that the chassis 10 functions as a lid, that is, it can prevent falling objects from passing through the chassis 10 and colliding with the spindle 24.

[0047] In addition, in the present invention, there is no limitation on the shape of the loading platform. For example, the shape of the loading platform adopted in the present invention may be an annular shape in plan view like the loading platform 22, or may be, for example, a circular shape, an elliptical shape, or a rectangular shape. Furthermore, in the present invention, for example, the loading platform may be replaceable according to the type of the object to be conveyed and the like.

[0048] In addition, in the present invention, the connection state between the chassis 10 and the frame 12 may be changeable. For example, in the present invention, from a state (usable state) in which the chassis 10 is mounted on the frame 12 so that the chassis 10 is positioned between the plurality of casters 8 and the loading platform 22, to a state (accommodated state) in which the chassis 10 is mounted on the frame 12 so that the plurality of casters 8 are positioned between the chassis 10 and the loading platform 22, and vice versa, may be possible.

[0049] FIG. 10 is a side view schematically showing the conveying device 2 including the chassis 10 mounted on the frame 12 in the usable state and the chassis 10 mounted on the frame 12 in the accommodated state, and FIG. 11 is a front view schematically showing this conveying device 2.

[0050] Specifically, in the conveying device 2 shown in FIGS. 10 and 11, the chassis 10 of the cart 4 is mounted on the frame 12 in the usable state, and the chassis 10 of the cart 6 is mounted on the frame 12 in the accommodated state. Specifically, the chassis 10 of the cart 6 in the accommodated state is mounted on the frame 12 so that a region of the bottom surface 10a close to a pair of side surfaces 10e, 10f, that is, a region where the caster 8 is not provided, contacts the bottom surface 14a of the mounted portion 14.

[0051] Incidentally, the change from the available state to the storage state of the chassis 10 is performed, for example, by reversing the chassis 10 removed from the frame 12, rotating the chassis 10 by 90° in plan view, and then attaching the chassis 10 to the frame 12 again. Also, the reverse change is performed, for example, by a similar procedure.

[0052] When the chassis 10 of the carriage 6 is attached to the frame 12 in the storage state, it is preferable in that it becomes easy to stack and transport a load different from the spindle 24 on this chassis 10. On the other hand, when the chassis 10 of the carriage 6 is attached to the frame 12 in the available state, it is preferable in that there is no need to replace the chassis 10 of the carriage 6 after the first transport step S1 shown in FIG. 6 and before the removal step S3.

[0053] Also, in the present invention, legs for floating a plurality of grounded wheels 8a may be attached to the frame 12. For example, in the present invention, these legs may be movable so as to be positioned at either a position (immovable self-standing position) for floating a plurality of grounded wheels 8a or a position (transportable position) for grounding the floating plurality of wheels 8a again.

[0054] FIG. 12 is a side view schematically showing the transport tool 2 including legs positioned at the immovable self-standing position, and FIG. 13 is a front view schematically showing this transport tool 2. Also, FIG. 14 is a side view schematically showing the transport tool 2 including legs positioned at the transportable position, and FIG. 15 is a front view schematically showing this transport tool 2.

[0055] In the transport tool 2 shown in FIGS. 12 to 15, for example, a plurality (for example, four) of connecting portions 28 are attached to the attached portion 14 of the frame 12 using a fixture (not shown) such as a bolt. Each connecting portion 28 has a shape like a gutter. Specifically, each connecting portion 28 has a bottom plate 28a and a pair of side plates 28b and 28c vertically provided from both ends of the bottom plate 28a.

[0056] In addition, each connecting portion 28 is located outside the chassis 10 mounted on the mounted portion 14 of the frame 12 in a plan view, and is mounted on the mounted portion 14 so as to be located above the lower ends of the plurality of wheels 8a whose lower ends are grounded.

[0057] Furthermore, each connecting portion 28 is provided with a support plate 28d that connects a pair of side plates 28b and 28c, and a female screw that penetrates the support plate 28d is formed at the center of the support plate 28d. Also, a leg portion 30 is screwed into this female screw.

[0058] Specifically, this leg portion 30 is, for example, a bolt provided with a disk-shaped grounding portion 30a at its lower end, and its male screw portion (central portion) 30b is screwed into the female screw. Then, when the head portion 30c of the leg portion 30 is rotated using a ratchet or the like, the leg portion 30 moves up and down.

[0059] For example, by rotating the head portion 30c clockwise, the leg portion 30 can be lowered to ground the grounding portion 30a, that is, the leg portion 30 can be positioned at the non-movable self-standing position (see FIGS. 12 and 13). Also, by rotating the head portion 30c counterclockwise, the leg portion 30 can be raised to float the grounding portion 30a, that is, the leg portion 30 can be positioned at the transportable position (see FIGS. 14 and 15).

[0060] Also, if the leg portion 30 is positioned at the non-movable self-standing position, it becomes easier to change the connection state between the chassis 10 and the frame 12 of the lower one (for example, the carriage 4) of the two carriages 4 and 6 (that is, the change from the available state to the storage state and the reverse change).

[0061] And if the chassis 10 of the lower one of the two carriages 4 and 6 is mounted on the frame 12 in the storage state, it becomes easier to insert a fork of a forklift or a hand lift under the transport tool 2. Therefore, in this case, the degree of freedom in handling the transport tool 2 is increased.

[0062] Also, when the leg portion 30 is attached to the lower frame 12 of the two carriages 4 and 6, it is preferable in that it can suppress the unintentional movement of the conveying tool 2 when the conveying tool 2 is conveyed by a truck or the like. On the other hand, when the leg portion 30 is not attached to the lower frame 12 of the two carriages 4 and 6, it is preferable in that the structure of the conveying tool 2 is simplified and its manufacturing cost is reduced.

[0063] In the present invention, a cover that surrounds at least a part of the side surface of the spindle 24 may be attached to the frame 12 when the spindle 24 is conveyed. FIG. 16 is a side view schematically showing the conveying tool 2 provided with such a cover, and FIG. 17 is a front view schematically showing the conveying tool 2 provided with such a cover.

[0064] In the conveying tool 2 shown in FIGS. 16 and 17, for example, a pair of covers 32a and 32b for defining a space between the loading platforms 22 of the two connected carriages 4 and 6 together with the connecting portion 20 are attached to the base portions 18 of the frames 12 of the respective carriages 4 and 6 and / or the connecting portion 20 by using fixtures (not shown) such as bolts.

[0065] Furthermore, in this conveying tool 2, for example, a plurality (for example, four) of covers 34a, 34b, 34c, and 34d for defining a space between the plurality of prism portions 16 are attached to at least one of the plurality of attached portions 14, the plurality of prism portions 16, or the base portion 18 of the frames 12 of the respective carriages 4 and 6 by using fixtures (not shown) such as bolts.

[0066] When the conveying tool 2 includes the covers 32a, 32b, 34a, 34b, 34c, and 34d, it is preferable in that the spindle 24 can be protected. On the other hand, when the conveying tool 2 does not include the covers 32a, 32b, 34a, 34b, 34c, and 34d, it is preferable in that the structure of the conveying tool 2 is simplified and its manufacturing cost is reduced.

[0067] In the present invention, a cover that surrounds at least a part of the side surface of the spindle 24 may be provided integrally with the frame 12 when the spindle 24 is being transported. This cover is provided, for example, on the side surface of the base portion 18 of the frame 12 via a movable connecting member such as a hinge (hinge).

[0068] And this cover is positioned outside the prism portion 16, hanging down from the base portion 18, for example, when the spindle 24 is not being transported (for example, during the above-described removal step S3 and attachment step S4). In this case, it is preferable in that the unloading of the spindle 24 from the loading platform 22 and the loading onto the loading platform 22 can be performed without being hindered by this cover.

[0069] Also, the object to be transported in the present invention is not limited to the spindle 24 of the grinding device 26. That is, the transport tool of the present invention may be used for transporting parts other than the spindle 24 of the grinding device 26 (for example, a chuck table). Alternatively, the transport tool of the present invention may be used for transporting parts of a machine other than the grinding device 26.

[0070] In addition, the structures, methods, etc. according to the above-described embodiments can be appropriately modified and implemented without departing from the scope of the object of the present invention.

Explanation of Reference Numerals

[0071] 2: Transport tool 4, 6: Cart 6: Cart 8: Caster (8a: Wheel, 8b: Support) 10: Chassis (10a, 10b: Bottom surface, 10c, 10d, 10e, 10f: Side surface) 12: Frame 14: Mounting portion (14a, 14b: Bottom surface) 16: Prism portion 18: Base portion (18a: Opening, 18b, 18c: Bottom surface) (18d, 18e: Side surface, 18f: Groove) 20: Connecting portion (20a: Outer surface, 20b: Inner surface) 22: Loading platform (22a: Opening) 24: Spindle (24a: Good product (replacement part), 24b: Defective product (part to be replaced)) 26: Grinding device 28: Connecting part (28a: Bottom plate, 28b, 28c: Side plates, 28d: Support plate) 30: Leg (30a: Grounding part, 30b: Male screw part (central part), 30c: Head part) 32a, 32b: Cover 34a, 34b, 34c, 34d: Cover

Claims

1. A conveying tool used for conveying an object to be conveyed, including a first carriage having a plurality of first wheels, a first chassis on which the plurality of first wheels are provided, a first frame to which the first chassis is attached, and a first loading platform attached to the first frame so as to be located on the opposite side of the first chassis; a second carriage having a plurality of second wheels, a second chassis on which the plurality of second wheels are provided, a second frame to which the second chassis is attached, and a second loading platform attached to the second frame so as to be located on the opposite side of the second chassis, and the object to be conveyed is loaded on the lower one of the first loading platform and the second loading platform facing each other in the vertical direction, the lower one of the plurality of first wheels or the plurality of second wheels is grounded, and the upper one of them is located above the first loading platform and the second loading platform, and the first carriage and the second carriage are connected to convey the object to be conveyed.

2. The first carriage and the second carriage are connected such that the plurality of first wheels are located below the plurality of second wheels, The conveying tool according to claim 1, wherein the first frame is equipped with movable legs that can be positioned in either an immovable self-supporting position that floats the grounded plurality of first wheels or a conveyable position that grounds the floating plurality of first wheels again.

3. a change from a first available state in which the first chassis is attached to the first frame so as to be positioned between the plurality of first wheels and the first loading platform in the vertical direction to a first storage state in which the first chassis is attached to the first frame so as to be positioned between the plurality of first wheels and the first loading platform, a change from the first storage state to the first available state, Changing the second chassis from the second available state in which the second chassis is mounted on the second frame so as to be positioned between the plurality of second wheels and the second loading platform in the vertical direction to the second storage state in which the plurality of second wheels are positioned between the second chassis and the second loading platform, changing the second chassis from the second storage state to the second available state, and the conveying tool according to claim 1 or 2, wherein the change is possible.

4. The conveying tool according to claim 1 or 2, further comprising a cover that is mounted on at least one of the first frame or the second frame and that surrounds at least a part of a side surface of the object to be conveyed when the object to be conveyed is conveyed.

5. The conveying tool according to claim 1 or 2, wherein each of the first loading platform and the second loading platform is replaceable.

6. A first cart having a plurality of first wheels, a first chassis on which the plurality of first wheels are provided, a first frame to which the first chassis is mounted, and a first loading platform mounted on the first frame so as to be located on the opposite side of the first chassis, A second cart having a plurality of second wheels, a second chassis on which the plurality of second wheels are provided, a second frame to which the second chassis is mounted, and a second loading platform mounted on the second frame so as to be located on the opposite side of the second chassis, A method for replacing parts of a machine using a conveying tool including: A first conveying step of conveying the conveying tool configured by connecting the first cart and the second cart to a position where the replacement part can be attached to the machine, with the replacement part loaded on the first loading platform located below the first loading platform and the second loading platform facing each other in the vertical direction, the plurality of first wheels being grounded, and the plurality of second wheels being located above the first loading platform and the second loading platform; A separating step of separating the first cart and the second cart after the first conveying step; A removing step of removing the part to be replaced from the machine and loading it on the second loading platform after the separating step; After the removal step, an attachment step of attaching the replacement part stacked on the first loading platform to the machine; After the attachment step, the replacement part is stacked on the second loading platform located below the first loading platform and the second loading platform facing each other in the vertical direction, the plurality of second wheels are grounded, and the plurality of first wheels are located above the first loading platform and the second loading platform. A connecting step of forming the conveying tool by connecting the first carriage and the second carriage; After the connecting step, a second conveying step of conveying the conveying tool from the position; A method for replacing parts comprising the above.

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