Transport vehicle

Abstract

To provide a carrier capable of reducing an installation space of a placing table on which a carrying object is placed.SOLUTION: Support parts 21 projecting from a vehicle body 2 (a body part 20) and supported by wheels 5a, 5b are provided, and a lifter 6 is provided on each of a pair of support parts 21 horizontally arranged side by side. Since the coil 200 is lifted by raising the lifter 6 from each of the pair of support parts 21 in a state in which the stage 100 having a smaller width dimension than the coil 200 is disposed between the pair of support parts 21, the width dimension of the stage 100 can be made smaller than the distance between the pair of support parts 21 (the vehicle width of the transport vehicle 1). Therefore, the installation space of the susceptor 100 can be reduced.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a transport vehicle, and more particularly to a transport vehicle that can reduce the installation space of a platform on which an object to be transported is placed. [Background technology]

[0002] There is known a transport vehicle that lifts and transports an object such as a coil placed on a mounting table. For example, Patent Document 1 describes an automated guided vehicle 1 (transport vehicle) that transports a coil 7 (object) placed on a pair of L-shaped transfer tables 8 (mounting tables) that rise from the road surface. The automated guided vehicle 1 is provided with a saddle 4 (lifter) that moves up and down by the extension and contraction of a lift cylinder 2 (driving means). When the automated guided vehicle 1 is inserted between the pair of transfer tables 8, the saddle 4 is raised, and the coil on the transfer table 8 is lifted by the saddle 4. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 08-301002 (for example, paragraph 0022, Figures 26 and 27) Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional technology, the automatic guided vehicle 1 is configured to enter between the pair of transfer tables 8, so the distance between the transfer tables 8 needs to be larger than the width of the automatic guided vehicle 1. This poses a problem of increased installation space for the transfer tables 8 (mounting tables).

[0005] The present invention has been made to solve the above-mentioned problems, and has an object to provide a transport vehicle that can reduce the installation space of a platform on which an object to be transported is placed. [Means for solving the problem]

[0006] In order to achieve this purpose, the transport vehicle of the present invention comprises a plurality of wheels, a body supported by the wheels, a lifter that moves up and down relatively to the body, and a driving means that applies a driving force to raise and lower the lifter, and transports an object placed on a platform by supporting it on the support surface of the lifter, the body comprising a main body and a support part that protrudes from the main body and is supported by the wheels, the lifter is provided on each of a pair of support parts that are arranged side by side horizontally, and with the platform that is smaller in width than the object being transported positioned between the pair of support parts, the lifter can be raised from each of the pair of support parts to lift the object being transported, or the lifter can be lowered to place the object being transported on the platform. [Effects of the Invention]

[0007] The transport vehicle described in claim 1 has the following advantages. A lifter is provided on each of a pair of support parts arranged side by side in the horizontal direction. A platform having a width smaller than the object to be transported is positioned between the pair of support parts. The object to be transported is lifted by raising the lifter from each of the pair of support parts, while the object is placed on the platform by lowering the lifter in the same state. This allows the width of the platform to be smaller than the distance between the pair of support parts, thereby reducing the installation space for the platform. Furthermore, because the pair of support parts are supported by wheels, the support parts are prevented from being cantilevered relative to the vehicle body. This has the advantage of allowing the object to be transported stably.

[0008] The transport vehicle of claim 2 achieves the following effect in addition to the effect achieved by the transport vehicle of claim 1. The wheels supporting the support part are positioned closer to the tip of the support part than the support position of the lifter on the support part, so that when the lifter lifts the transported object, it is possible to reliably prevent the support part from being cantilevered relative to the vehicle body. This has the effect of enabling stable transport of the transported object.

[0009] The transport vehicle of claim 3 achieves the following effect in addition to the effect achieved by the transport vehicle of claim 1. The wheels supporting the main body of the vehicle are drive wheels that rotate when a driving force is applied, while the wheels supporting the support parts are driven wheels that are driven by the movement of the transport vehicle as the drive wheels rotate. This eliminates the need to provide a drive system in the support parts for driving the wheels that support the support parts, allowing the height of the support parts to be lowered. By lowering the height of the support parts (lifters), the height of the mounting table can also be lowered, resulting in the effect of suppressing the cost and increase in mass of the mounting table.

[0010] The transport vehicle of claim 4 achieves the following effect in addition to the effect achieved by the transport vehicle of claim 1. The wheels supporting the support part have a smaller diameter than the wheels supporting the main body part, so the height of the support part (lifter) can be reduced. This allows the height of the mounting table to be reduced, which has the effect of suppressing the cost and increase in mass of the mounting table.

[0011] The transport vehicle of claim 5 achieves the following effect in addition to the effect achieved by the transport vehicle of claim 1. The base end of the lifter is supported around a rotation axis along the protruding direction of the support parts, and the tip of the lifter is located inside the lifter's rotation axis in the opposing direction of the pair of support parts. By rotating the lifter using the driving force of a driving means that expands and contracts up and down, the support surface formed on the tip side of the lifter rises and falls up and down, which has the effect of simplifying the lifter's lifting structure compared to, for example, a configuration in which the lifter slides up and down. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1(a) is a side view of a transport vehicle according to an embodiment of the present invention, and FIG. 1(b) is a top view of the transport vehicle as viewed in the direction of arrow Ib in FIG. 1(a). [Figure 2] FIG. 2 is a front view of the transport vehicle 1 as viewed in the direction of arrow II in FIG. [Figure 3]3(a) is a cross-sectional view of the support part taken along line IIIa-IIIa in FIG. 1(b), and FIG. 3(b) is a cross-sectional view of the support part showing the state in which the hydraulic cylinder is extended from the state in FIG. 3(a) and the lifter is rotated. [Figure 4] 3 is a front view of the transport vehicle showing a state in which the coil has been lifted by a lifter from the state shown in FIG. 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] A preferred embodiment of the present invention will now be described with reference to the accompanying drawings. First, the overall configuration of a transport vehicle 1 will be described with reference to FIG. 1. FIG. 1(a) is a side view of the transport vehicle 1 in one embodiment of the present invention, and FIG. 1(b) is a top view of the transport vehicle 1 as viewed in the direction of arrow Ib in FIG. 1(a). Note that FIG. 1(b) omits the illustration of the coil 200 (see FIG. 1(a)) placed on the mounting table 100.

[0014] As shown in Fig. 1, the transport vehicle 1 is an automated transport vehicle that automatically travels with a payload such as a cylindrical coil 200 placed on a platform 100 loaded on a vehicle body 2. The platform 100 is formed into a substantially rectangular parallelepiped shape using resin or the like, and although not shown, a plurality of platforms 100 are lined up (for example, in a direction perpendicular to the plane of the paper in Fig. 1(a)) within the premises of a factory or the like that serves as a travel surface 300 for the transport vehicle 1.

[0015] The vehicle body 2 of the transport vehicle 1 includes a main body 20 and a support part 21 that protrudes toward the front side (the right side in FIG. 1) of the main body 20. The main body 20 is supported by a traveling device 3 that allows the transport vehicle 1 to travel and steer.

[0016] The traveling devices 3 are provided in pairs, spaced apart in the left-right direction (the up-down direction in FIG. 1(b)). Each of the pair of traveling devices 3 is provided with a pair of wheels 30 (two wheels in this embodiment), and the traveling devices 3 are configured so that the steering angle of the pair of wheels 30 can be changed by power from a steering drive device (not shown). The traveling devices 3 are also provided with a rotation drive device (for example, an electric motor 31), and the wheels 30 rotate by the driving force applied from this rotation drive device.

[0017] The main body 20 is equipped with a battery (not shown) for supplying power to the above-mentioned drive devices, a hydraulic unit (not shown) for extending and retracting the hydraulic cylinder 4 (described later), and the like. The hydraulic unit is a unit that includes a pump for supplying and discharging hydraulic oil to and from the hydraulic cylinder 4, a motor for operating the pump, and the like.

[0018] The support parts 21 protrude horizontally from the lower end of the front surface of the main body part 20, and the coil 200 is lifted by a pair of support parts 21 spaced apart in the left-right direction of the vehicle body 2 (the horizontal direction perpendicular to the protruding direction of the support parts 21) (see Figure 4 for the state in which the coil 200 is lifted by the pair of support parts 21).

[0019] The pair of support parts 21 are configured symmetrically. Furthermore, the support parts 21 are provided with wheels 5a, 5b that support the support parts 21, a lifter 6 (see FIG. 1(b)) that lifts the coil 200, and the like, and these components provided on the support parts 21 are also symmetrical.

[0020] Next, the detailed configuration of the transport vehicle 1 will be described with reference to Figures 2 and 3. Figure 2 is a front view of the transport vehicle 1 as viewed in the direction of arrow II in Figure 1(b). Figure 3(a) is a cross-sectional view of the support part 21 taken along line IIIa-IIIa in Figure 1(b), and Figure 3(b) is a cross-sectional view of the support part 21 showing a state in which the hydraulic cylinder 4 is extended from the state in Figure 3(a) and the lifter 6 is rotated.

[0021] 2 does not show part of the transport vehicle 1 (such as the main body 20 of the vehicle body 2), and Fig. 3 shows a cross section of one of the pair of support parts 21, which is located on the right side of the vehicle body 2 (the left side when the vehicle body 2 is viewed from the front). In the following description, the center side of the vehicle body 2 in the opposing direction of the support parts 21 (the left-right direction in Fig. 2) will be referred to as the "inner side in the left-right direction," and the opposite side will be referred to as the "outer side in the left-right direction."

[0022] 2 and 3, the support part 21 includes an outer plate 21a that forms the outer side surface in the left-right direction, a bottom plate 21b (see FIG. 3) that forms the bottom surface, an inner plate 21c that forms the inner side surface in the left-right direction, and a top plate 21d that forms the top surface. The outer plate 21a, bottom plate 21b, inner plate 21c, and top plate 21d form a closed cross section.

[0023] A step 21e is provided at the front end of the bottom surface of the support portion 21 for installing wheels 5a, 5b (see FIG. 1 for wheel 5b). Step 21e is formed in a box shape (with an opening at the bottom) surrounded by outer plate 21a, inner plate 21b, and top plate 21c. The front end of step 21e is closed by front plate 21f (see FIG. 2), and the rear end of step 21e is partitioned by a partition plate (not shown) (a plate that closes the closed cross section at the front end portion of bottom plate 21b). A support shaft 7 (axle) extending in the left-right direction is spanned inside step 21e, and wheels 5a, 5b are rotatably supported by support shaft 7.

[0024] The outer plate 21a protrudes above the top plate 21d, and support plates 8 for pivotally supporting the lifter 6 are fixed to the inner side surfaces of the protruding portion in the left-right direction and to the upper surface of the top plate 21d. The support plates 8 are rectangular metal plates, and a support shaft 9 is supported between a pair of support plates 8 aligned in the front-rear direction (see FIG. 1(b) for the fact that the support plates 8 are provided in pairs). Details of the structure for rotating the lifter 6 around the support shaft 9 along the front-rear direction will be described with reference to FIG. 3.

[0025] 3, the lifter 6 includes an arm 60 whose base end (the outer end in the left-right direction) is pivotally supported by a support shaft 9, and a support base 61 fixed to the tip end (the inner end in the left-right direction) of the arm 60. The arm 60 is a metal plate that extends from its base end (support shaft 9) toward the inside in the left-right direction of the support part 21, and the plate thickness direction of the arm 60 coincides with the front-rear direction of the vehicle body 2 (the direction perpendicular to the plane of the paper in FIG. 3).

[0026] An inclined surface 60a is formed at the tip of the arm 60, sloping downward from the upper end of the arm 60 toward the inside in the left-right direction, and a receiving base 61 made of a metal plate is fixed to this inclined surface 60a. That is, the upper surface of the receiving base 61 is inclined downward toward the inside in the left-right direction of the lifter 6, and this inclined upper surface of the receiving base 61 serves as a support surface 61a that supports the coil 200 (see FIG. 4).

[0027] The support base 61 is supported by a pair of arms 60 aligned in the front-to-rear direction (see FIG. 1(b)), and a driving force is applied to each of these arms 60 from a hydraulic cylinder 4 (see FIG. 1(b)). That is, the pair of arms 60 are driven by two hydraulic cylinders 4.

[0028] The hydraulic cylinder 4 is a known cylinder that includes a cylindrical cylinder tube 40 and a piston rod 41 that extends and retracts relative to the cylinder tube 40. A through hole 21g is formed at the inner end in the left-right direction of the top plate 21d of the support part 21, and the cylinder tube 40 inserted through this through hole 21g is fixed inside the support part 21.

[0029] A resin pad 62 is attached to the lower surface of the distal end of the arm 60, and a lower surface 62a of the pad 62 is formed in a downwardly convex arc shape when viewed in the front-to-rear direction. The lower surface 62a of the pad 62 is supported from below by the piston rod 41.

[0030] 3(b), when hydraulic oil is supplied and the hydraulic cylinder 4 extends upward, the piston rod 41 slides on the lower surface 62a (curved surface) of the pad 62 and pushes up the pad 62. The lifter 6 (the arm 60 and the pedestal 61) rotates around the support shaft 9 as the pad 62 is pushed up, causing the support surface 61a of the pedestal 61 to rise and lift the coil 200 (see FIG. 4).

[0031] Next, a method for transporting the coil 200 by the transport vehicle 1 will be described with reference to Fig. 4. Fig. 4 is a front view of the transport vehicle 1 showing a state in which the coil 200 has been lifted by the lifter 6 from the state shown in Fig. 2.

[0032] 4, a pair of inclined surfaces 101 are formed on the upper surface of the mounting table 100, sloping downward from both left and right ends of the mounting table 100 toward the center. That is, the upper surface of the mounting table 100 is formed in a V-shape that is concave downward when viewed in the front-to-rear direction (when viewed in the axial direction of the coil 200 placed on the mounting table 100), and when the cylindrical coil 200 is placed on the mounting table 100, the pair of inclined surfaces 101 support the outer circumferential surface of the coil 200 at two points.

[0033] The width dimension of the mounting table 100 in the left-right direction is formed to be smaller than the diameter of the coil 200, and when the coil 200 is placed on the mounting table 100, the outer peripheral surface of the coil 200 protrudes on both left-right sides of the mounting table 100. In addition, the distance between the pair of supports 21 (between the receiving bases 61) is formed to be slightly larger than the width dimension of the mounting table 100.

[0034] When lifting the coil 200 from the mounting table 100, the pair of support parts 21 are advanced toward both the left and right sides of the mounting table 100 (in a direction perpendicular to the plane of the paper in FIG. 4 ), thereby inserting the support parts 21 between the outer circumferential surface (underside) of the coil 200 and the travel road surface 300. In this inserted state, the hydraulic cylinder 4 (piston rod 41) is extended and the lifter 6 is rotated around the support shaft 9, whereby the support surface 61 a of the receiving table 61 rises in conjunction with the rotation, thereby lifting the coil 200 from the mounting table 100. The coil 200 lifted by the transport vehicle 1 is transported to another mounting table or the like.

[0035] On the other hand, when placing the coil 200 that has been carried from another mounting table or the like on the mounting table 100, the support parts 21 with the coil 200 lifted by the lifter 6 are similarly advanced to both the left and right sides of the mounting table 100. In this advanced state, the hydraulic cylinder 4 (piston rod 41) is contracted to lower the support surface 61a, thereby placing the coil 200 on the mounting table 100.

[0036] As described above, the transport vehicle 1 of this embodiment includes support parts 21 that protrude from the vehicle body 2 (main body part 20) and are supported by wheels 5a, 5b, and a lifter 6 is provided on each of a pair of support parts 21 that are arranged side by side in the horizontal direction (left and right direction in FIG. 4). Then, with the mounting table 100, which has a width smaller than that of the coil 200, positioned between the pair of support parts 21, the coil 200 is lifted by raising the lifter 6 from each of the pair of support parts 21. Therefore, the width of the mounting table 100 can be made smaller than the distance between the pair of support parts 21 (the vehicle width of the transport vehicle 1). This reduces the installation space for the mounting table 100, allowing a large number of mounting tables 100 (coils 200) to be installed on the premises of a factory or the like.

[0037] Furthermore, since support portion 21 is supported by wheels 5a and 5b, support portion 21 supporting coil 200 can be transported while being supported by wheels 5a and 5b. This prevents support portion 21 from being cantilevered relative to vehicle body 2 (main body 20), allowing coil 200 to be transported stably.

[0038] Here, in this embodiment, the coil 200 is lifted by the lifter 6 that rotates around the support shaft 9, but it is also possible to adopt a configuration in which the coil 200 is lifted by sliding the lifter 6 up and down, for example. One example of such a configuration is a configuration in which the arm 60 of the lifter 6 is omitted and both front and rear ends of the receiving base 61 are slidably engaged with slide guides (grooves or rails extending in the vertical direction). Even in this configuration, the support surface 61a can be raised and lowered by applying power from the hydraulic cylinder 4 to slide the receiving base 61 up and down.

[0039] However, if the receiving base 61 is configured to slide up and down, the structure is likely to become complicated by the provision of slide guides, etc., and in addition, rattles at the engagement portions between the receiving base 61 and the slide guides may make it difficult to smoothly slide the receiving base 61. In particular, in this embodiment, the lifter 6 is raised and lowered by the power of two hydraulic cylinders 4 (see FIG. 1(b)) arranged in the front-to-rear direction, so if the receiving base 61 is configured to slide up and down, it will be difficult for the receiving base 61 to rise and lower smoothly relative to the slide guides if there is a difference in the amount of expansion and contraction of each hydraulic cylinder 4.

[0040] In contrast to this, in this embodiment, the support surface 61a is raised and lowered by rotating the receiving base 61 (lifter 6) using the driving force of the hydraulic cylinder 4 that expands and contracts up and down. With this configuration, unlike the above-mentioned configuration in which the receiving base 61 (lifter 6) slides up and down, it is not necessary to provide a slide guide or the like, and therefore the lifting structure of the lifter 6 can be simplified.

[0041] Furthermore, since the lifter 6 is designed to rotate around the support shaft 9, it is possible to prevent the above-mentioned rattle from occurring when the lifter 6 slides up and down, and even if there is a difference in the amount of extension and contraction of the two hydraulic cylinders 4 lined up in the front-to-back direction, the lifter 6 can be reliably raised by extending one of the hydraulic cylinders 4.

[0042] As described above, in this embodiment, the lifter 6 supported on the support shaft 9 is rotated by the driving force of the hydraulic cylinder 4, so the load when the coil 200 is lifted by the lifter 6 acts mainly on the hydraulic cylinder 4. In other words, the load when the coil 200 is lifted is likely to act on the region of the support part 21 where the hydraulic cylinder 4 is attached.

[0043] Therefore, in this embodiment, the wheels 5a and 5b are arranged closer to the tip of the support part 21 than the hydraulic cylinder 4 (the support position of the lifter 6 on the support part 21) (see FIG. 1). This reliably prevents the support part 21 from being cantilevered relative to the vehicle body 2 (main body part 20) when the coil 200 is lifted by the lifter 6. Therefore, the coil 200 can be transported stably.

[0044] Here, it is preferable that the height of the lifter 6 from the travel surface 300 of the transport vehicle 1 is as low as possible. This is because if the height of the lifter 6 (support surface 61a) is high, in order to lift the coil 200, for example, the height of the mounting table 100 must also be increased to match the lifter 6, which increases the cost and mass of the mounting table 100.

[0045] Furthermore, if the height of the lifters 6 (support surfaces 61a) is high, it is also possible to widen the gap between the pair of lifters 6 without changing the height of the mounting table 100, and support the outer circumferential surface of the coil 200 above the support position shown in Fig. 4. However, in a configuration in which the gap between the lifters 6 is widened, it is also necessary to increase the gap between the support parts 21 (the width of the transport vehicle 1) accordingly.

[0046] In contrast to this, in this embodiment, as described above, the wheels 30 (see FIG. 1) that support the vehicle body 2 (main body 20) are drive wheels, while the wheels 5a, 5b that support the support part 21 are driven wheels that follow the movement of the transport vehicle 1 as the wheels 30 rotate (they rotate freely around the support shaft 7). This eliminates the need to provide a drive system for driving the wheels 5a, 5b near the wheels 5a, 5b (i.e., the support part 21), and therefore the height of the support part 21 can be reduced.

[0047] Furthermore, since support unit 21 is supported by multiple wheels 5a, 5b (four wheels in this embodiment) arranged in the front, rear, left, and right directions, it is possible to reduce the diameter of wheels 5a, 5b while providing wheels 5a, 5b with the load resistance required to support coil 200. For example, in this embodiment, wheels 5a, 5b supporting support unit 21 have a smaller diameter than wheels 30 supporting main body 20, which also allows the height of support unit 21 to be reduced.

[0048] In this way, by lowering the height of the support parts 21, i.e., the height of the lifters 6, it is possible to reduce the height of the mounting table 100 while narrowing the distance between the pair of lifters 6. This makes it possible to suppress increases in cost and mass of the mounting table 100, and also to reduce the distance between the support parts 21 (the width of the transport vehicle 1). By reducing the distance between the support parts 21 (the width of the transport vehicle 1) and reducing the space required for the transport vehicle 1 to travel, it is possible to narrow the distance between adjacent mounting tables 100 in the left-right direction, for example. Therefore, it is possible to store a large number of mounting tables 100 (coils 200) on the premises of a factory or the like.

[0049] The present invention has been described above based on the above embodiment, but the present invention is not limited to the above form in any way, and it can be easily inferred that various modifications and improvements are possible within the scope that does not deviate from the spirit of the present invention.

[0050] In the above embodiment, the case where the transport vehicle 1 equipped with the pair of support parts 21 (lifters 6) is an unmanned transport vehicle has been described, but this is not necessarily limited to this. For example, the transport vehicle 1 may be equipped with a driver's seat or a driver's cab and driven by a driver.

[0051] In the above embodiment, coil 200 is given as an example of a cylindrical transport object to be lifted by lifter 6, but this is not necessarily limited to this. For example, steel pipes and tires are examples of other cylindrical transport objects. Furthermore, the shape of the transport object is not limited to a cylinder, and may be other shapes such as a column, a square tube, or a rectangular parallelepiped.

[0052] In the above embodiment, when a pair of support parts 21 is considered as one set, the case where one set of support parts 21 is provided on the transport vehicle 1 has been described, but multiple sets of support parts 21 may also be provided on the transport vehicle 1.

[0053] In the above embodiment, the wheel 30 supporting the main body 20 of the vehicle body 2 is a drive wheel, while the wheels 5a, 5b supporting the support portion 21 are driven wheels, but this is not necessarily limited to this. For example, the wheel 30 may be a driven wheel, and the wheels 5a, 5b may be drive wheels.

[0054] In the above embodiment, the case where the travel of the transport vehicle 1 is steered by the wheel 30 has been described, but this is not necessarily limited to this. For example, the travel of the transport vehicle 1 may be steered by the wheels 5a and 5b. Also, a transport vehicle 1 whose travel is steered by each of the wheels 30 and 5a and 5b, that is, a transport vehicle 1 that can travel sideways and spin, may be configured to have a pair of support parts 21, and in such a configuration, the front-to-rear direction of the transport vehicle 1 and the protruding direction of the support parts 21 do not necessarily coincide.

[0055] In the above embodiment, the wheels 5a, 5b are arranged forward of the hydraulic cylinder 4 (the support position of the lifter 6 at the support portion 21), but some or all of the multiple wheels 5a, 5b may also be arranged rearward of the hydraulic cylinder 4.

[0056] In the above embodiment, the case where the support portion 21 is supported by a plurality of wheels 5a, 5b and the case where the diameter of the wheels 5a, 5b is smaller than that of the wheel 30 have been described, but this is not necessarily limited to this. For example, the number of wheels 5a, 5b supporting the support portion 21 may be one or more. Furthermore, the diameter of the wheels 5a, 5b may be larger than that of the wheel 30, or the diameters of the wheels 5a, 5b and the wheel 30 may be the same.

[0057] Although not described in the above embodiment, the diameters of the wheels 5a and 5b may be the same or different. Furthermore, the wheels 5a and 5b (support shafts 7) may be supported so as to be swingable up and down relative to the support portion 21.

[0058] In the above embodiment, the driving force of two hydraulic cylinders 4 is applied to the lifter 6 supported around the support shaft 9, but the driving force of one or three or more hydraulic cylinders 4 may be applied to the lifter 6. Also, the coil 200 may be lifted by sliding the lifter 6 up and down. One example of such a configuration is a configuration in which both front and rear ends of the receiving base 61 are slidably engaged with slide guides (grooves or rails extending in the up and down direction), as described in the above embodiment. Another example is a configuration in which the receiving base 61 is attached to the piston rod 41 of the hydraulic cylinder 4.

[0059] In the above embodiment, the hydraulic cylinder 4 is exemplified as an example of a driving means for applying a driving force to the lifter 6, but the lifter 6 may be raised and lowered by other known driving means such as a motor or an actuator. Also, although not described in the above embodiment, in order to synchronize the amounts of extension and contraction of the hydraulic cylinders 4 aligned in the left-right direction (between the pair of support parts 21), a known hydraulic oil flow rate adjustment mechanism such as a flow divider may be used.

[0060] In the above embodiment, the case has been described in which the receiving base 61 of the lifter 6 is a metal plate and the support surface 61a of the receiving base 61 is a flat surface that slopes downward toward the space between the pair of opposing supports 21, but this is not necessarily limited to this. For example, an engineering plastic such as MC nylon may be attached to the support surface 61a of the receiving base 61.

[0061] Furthermore, the support surface 61a of the cradle 61 may be a curved surface (an arc-shaped surface that follows the outer circumferential surface of the coil 200) that is recessed in a direction away from the outer circumferential surface of the coil 200 when viewed in the front-rear direction. This allows the coil 200 to be stably supported by the support surface 61a. Furthermore, in the case of an object that is not cylindrical like the coil 200 but can be stably supported on a horizontal surface, such as an object with a flat lower surface, the support surface 61a may be a horizontal surface. [Explanation of symbols]

[0062] 1 transport vehicle 2. Body 20 Main body 21 Support part 30,5a,5b wheels 4 Hydraulic cylinder (drive means) 6 Lifter 61a Support surface 9. Support shaft (rotating shaft) 100 Mounting table 200 coils (carried goods)

Claims

1. A transport vehicle comprising a plurality of wheels, a vehicle body supported by the wheels, a lifter that moves up and down relative to the vehicle body, and a driving means that applies a driving force to raise and lower the lifter, and which transports an object placed on a platform by supporting it on the support surface of the lifter, the vehicle body includes a main body portion and a support portion that protrudes from the main body portion and is supported by the wheel; The lifter is provided on each of the pair of support parts arranged side by side in the horizontal direction, A transport vehicle characterized in that, when the platform, which has a width dimension smaller than the transported object, is positioned between a pair of support parts, the lifter can be raised from each of the pair of support parts to lift the transported object, or the lifter can be lowered to place the transported object on the platform.

2. 2. The transport vehicle according to claim 1, wherein the wheels supporting the support portion are arranged closer to the tip of the support portion than the support position of the lifter on the support portion.

3. the wheels supporting the main body are drive wheels that rotate when a driving force is applied thereto; 2. The transport vehicle according to claim 1, wherein the wheels supporting the support parts are driven wheels that are driven by the rotation of the drive wheels as the transport vehicle travels.

4. 2. The transport vehicle according to claim 1, wherein the wheels supporting the support portion have a smaller diameter than the wheels supporting the main body portion.

5. The base end side of the lifter is pivotally supported around a rotation axis along the protruding direction of the support part, a tip end of the lifter is located inside the rotation shaft in the opposing direction of the pair of support parts, 2. The transport vehicle according to claim 1, wherein the lifter is rotated by the driving force of the driving means which expands and contracts up and down, thereby raising and lowering the support surface formed on the tip end side of the lifter.

Images