Loading device for truck

Abstract

To provide a loading device for a truck, which can suppress damaging of the truck, a loading pad, or the like caused by an adjusting mistake of the horizontal position of the loading pad.SOLUTION: An inside detection sensor 41 and an outside detection sensor 42 respectively attached to both left and right sides of a loading pad 40 are for detecting the upper surface 17a of an air spring 17 positioned directly below themselves. In a state where at least one of the inside and outside detection sensors 41 and 42 is yet to detect the upper surface 17a, the loading pad 40 and the upper surface 17a may be misaligned, and thus application of a load from the loading pad 40 to the upper surface 17a by a loading cylinder 37 is inhibited by inhibition means. Thus, the application of the load with the loading pad 40 and the upper surface 17a horizontally misaligned can be suppressed, and damaging of a truck 10, the loading pad 40, or the like caused by the adjustment mistake of the horizontal position of the loading pad 40 can be suppressed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a loading device for a bogie that applies a load to a bogie using a load pad, and more particularly to a loading device for a bogie that can suppress damage to the bogie, load pad, etc. caused by incorrect adjustment of the left and right positions of the load pad. [Background technology]

[0002] For example, when assembling or disassembling a bogie for a railway vehicle, it is known that the car body is not actually supported by the bogie, but rather an axle spring (elastic body) between the wheel set and the bogie frame is maintained in a compressed state using a bogie loading device (Patent Document 1). The bogie loading device applies a downward load from a pair of left and right load pads to a pair of left and right air springs that support the car body and a pair of left and right seats of the bogie frame that respectively support the air springs from below, thereby compressing the axle springs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-203749 A Summary of the Invention [Problem to be solved by the invention]

[0004] Since the distance between the pair of left and right air springs may differ depending on the type of bogie, conventionally, workers visually adjusted the distance between the pair of left and right load pads. However, if the load is applied by the bogie load device while this adjustment is incorrect, there is a risk of damage to the bogie, the load pads, etc.

[0005] The present invention has been made to solve the above-mentioned problems, and aims to provide a load device for a trolley that can suppress damage to the trolley, load pad, etc. caused by incorrect adjustment of the left and right positions of the load pad. [Means for solving the problem]

[0006] In order to achieve this objective, the bogie loading device of the present invention is a bogie that has a bogie frame provided with a pair of left and right seating surfaces that support a pair of left and right air springs from below, and wheel sets that support the front and rear of the bogie frame, respectively, and applies a downward load to a pair of the seating surfaces or a pair of pressure-receiving surfaces which are the upper surfaces of a pair of the air springs. This bogie load device comprises a pair of load pads that can abut against the pair of pressure-receiving surfaces, respectively; a support portion that supports the pair of load pads so that the fore-aft positions of the pair of load pads and the pair of pressure-receiving surfaces are aligned; a lateral actuator that moves the load pads left and right relative to the support portion; a load actuator that moves the load pads up and down relative to the support portion to apply a downward load from the load pads to the pressure-receiving surfaces; an inner detection sensor and an outer detection sensor attached to both the left and right sides of at least one of the load pads, respectively, to detect the pressure-receiving surface located directly below the load pads; and a prohibition means that prohibits the load actuator from applying a load from the load pad to the pressure-receiving surfaces when at least one of the inner detection sensor and the outer detection sensor is not detecting the pressure-receiving surface.

[0007] In addition, the bogie load device of the present invention is a bogie that has a bogie frame that supports a pair of left and right air springs from below, and wheel sets that support the front and rear of the bogie frame, respectively, and applies a downward load to the upper surfaces of the pair of air springs. This bogie load device comprises a pair of load pads, each having a lower surface that can abut against the upper surfaces of the pair of air springs, and a recess formed in the center of the lower surface that can accommodate a protrusion protruding from the center of the upper surface of the air springs; a support portion that supports the pair of load pads so that the fore-aft positions of the pair of load pads and the pair of air springs are aligned; a lateral actuator that moves the load pad in a left-right direction relative to the support portion; a load actuator that moves the load pad in a vertical direction relative to the support portion to apply a downward load from the load pad to the air spring; a proximity sensor attached to at least one of the load pads and detects the air spring while the lower surface of the load pad is abutted against the upper surface of the air spring while accommodating the protrusion in the recess; and a prohibition means for prohibiting the load actuator from applying a load from the load pad to the air spring when the proximity sensor does not detect the air spring. Effect of the Invention

[0008] According to the loading device for a bogie described in claim 1, the pair of load pads and the pair of pressure receiving surfaces are aligned in the front-rear positions by the support parts. Furthermore, the load pads are moved in the left-right direction by the traverse actuator, and the left-right positions of the pair of load pads and the pair of pressure receiving surfaces are aligned. By operating the load actuator in this state, the load pads can be moved in the up-down direction to apply a downward load from the load pads to the pressure receiving surfaces.

[0009] The inner detection sensor and the outer detection sensor, which are attached to the left and right sides of the load pad, respectively, detect the pressure-receiving surface located directly below the sensor itself. When both the inner detection sensor and the outer detection sensor detect the pressure-receiving surface, it can be determined that the left and right positions of the load pad and the pressure-receiving surface are not misaligned. On the other hand, when at least one of the inner detection sensor and the outer detection sensor does not detect the pressure-receiving surface, there is a risk that the load pad and the pressure-receiving surface are misaligned. In such a state, the prohibiting means of the bogie loading device prohibits the load actuator from applying a load from the load pad to the pressure-receiving surface. As a result, it is possible to prevent the load from being applied while the left and right positions of the load pad and the pressure-receiving surface are misaligned, and it is possible to prevent damage to the bogie, the load pad, etc. caused by incorrect adjustment of the left and right positions of the load pad.

[0010] According to the load device for a bogie described in claim 2, in addition to the effects of the load device for a bogie described in claim 1, the following effects are achieved. The pair of pressure receiving surfaces are the upper surfaces of the pair of air springs, and a protrusion protrudes from the center of the upper surfaces of the air springs. A recess capable of accommodating this protrusion is formed in the center of the lower surface of the load pad. Inside detection sensor is the inside detection This object detection sensor is capable of detecting an air spring when the distance from the underside of the load pad to the air spring directly below the sensor is greater than the depth of the recess. The outer detection sensor is an object detection sensor that can detect the air spring when the distance from the underside of the load pad to the air spring directly below the outer detection sensor is greater than the depth of the recess. As a result, for example, when the load pad and the pressure receiving surface are misaligned, and the load actuator brings the load pad closer to the pressure receiving surface, the object detection sensor can detect the pressure receiving surface before the protrusion comes into contact with the load pad. This allows the prohibition means to prohibit the load pad from applying a load before the contact, making it difficult to damage the protrusion and the load pad.

[0011] The loading device for a bogie according to claim 3 achieves the following effect in addition to the effect achieved by the loading device for a bogie according to claim 1. The prohibiting means stops the movement of the load pad by the traverse actuator in response to the detection of the pressure-receiving surface by the inside detection sensor and the outside detection sensor attached to the load pad while moving the load pad by the traverse actuator. That is, the prohibiting means automatically aligns the left-right positions of the pair of load pads and the pair of pressure-receiving surfaces, thereby prohibiting the load actuator from applying a load while they remain misaligned. This makes it more difficult for damage to the bogie, the load pads, etc., caused by incorrect adjustment of the left-right positions of the load pads.

[0012] According to the loading device for a bogie described in claim 4, the pair of load pads and the pair of air springs are aligned in the front-rear positions by the support parts. Furthermore, the load pads are moved in the left-right direction by the traverse actuator, and the left-right positions of the pair of load pads and the pair of air springs are aligned. By operating the load actuator in this state, the load pads can be moved in the up-down direction to apply a downward load from the load pads to the upper surfaces of the air springs.

[0013] If the pair of load pads and the pair of air springs are not misaligned in the left-right direction, the lower surface of the load pad and the upper surface of the air spring come into contact with each other while the protrusion protruding from the center of the upper surface of the air spring is accommodated in the recess formed in the center of the lower surface of the load pad. In this state, the proximity sensor attached to the load pad detects the air spring, so that if the proximity sensor is not detected, there is a risk that the left-right positions of the load pad and the air spring are misaligned. In this case, the prohibiting means prohibits the load actuator from applying a load from the load pad to the air spring. As a result, it is possible to prevent the load from being applied while the left-right positions of the load pad and the air spring are misaligned, and it is possible to prevent damage to the cart, the load pad, etc., caused by incorrect adjustment of the left-right positions of the load pad, and in particular damage to the protrusion. [Brief description of the drawings]

[0014] [Figure 1]FIG. 2 is a perspective view of a bogie load device and a bogie in the first embodiment. [Diagram 2] FIG. [Diagram 3] 3 is a partially enlarged cross-sectional view of the bogie load device taken along line III-III in FIG. 2. [Figure 4] 4 is a partially enlarged rear view of the bogie load device as seen from the direction of arrow IV in FIG. 3. [Diagram 5] FIG. 4 is a block diagram showing the electrical configuration of the bogie load device. [Figure 6] 10 is a flowchart of a load application process executed by a CPU of the cart load device. [Figure 7] 10 is a flowchart of a load applying process in the second embodiment. [Figure 8] FIG. 11 is a partially enlarged rear view of the bogie load device in the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Preferred embodiments will be described below with reference to the accompanying drawings. First, a bogie load device 100 in a first embodiment will be described with reference to Figs. 1 and 2. Fig. 1 is a perspective view of the bogie load device 100 and the bogie 10. Fig. 2 is a plan view of the bogie load device 100. Arrows U, D, L, R, F, and B in each drawing indicate the upward, downward, leftward, rightward, forward, and backward directions of the bogie load device 100 and the bogie 10, respectively.

[0016] The bogie load device 100 is a device for applying a downward load to the bogie 10 of a railway vehicle. First, a description will be given of the bogie 10. The bogie 10 is formed to be point-symmetrical with respect to the center in the front, rear, left and right directions when viewed from above.

[0017] The bogie 10 includes two wheel axles 13 with a pair of wheels 12 fixed to both sides in the axial direction (left and right direction) of an axle 11, a bogie frame 14 supported by the two wheel axles 13 spaced apart in the front and rear, two main electric motors 15 attached to the bogie frame 14, and two gear boxes 16 attached to the two axles 11, respectively. Note that the bogie 10 does not necessarily have to include the main electric motors 15 and the gear boxes 16.

[0018] A bearing portion 13a is attached to each of both ends of the axle 11 that are axially outer than the wheels 12. The bearing portion 13a includes an elastic body 13b (axle spring) such as a coil spring that elastically supports the bogie frame 14 on the wheel set 13.

[0019] The bogie frame 14 is a frame formed in an H-shape when viewed from above. A pair of left and right air springs 17 are attached to both left and right sides of the center in the front-rear direction of the bogie frame 14. The bogie frame 14 is provided with a pair of left and right seats 14a (see FIG. 4) that support the pair of left and right air springs 17 from below. The seats 14a are flat surfaces that are perpendicular to the up-down direction and face upward.

[0020] Air spring 17 is a member that elastically supports the car body on bogie 10, and is filled with air. Air spring 17 is formed in a circular shape when viewed from above. A truncated cone-shaped protrusion 17b (see FIG. 4) protrudes upward from the radial center of upper surface 17a (see FIG. 4) of air spring 17. Air is supplied and exhausted from the tip of protrusion 17b inside air spring 17.

[0021] The main motor 15 is an electric motor that generates driving force for running the railway vehicle by rotating the wheel set 13. The gear box 16 is a mechanism for transmitting the driving force of the main motor 15 to the wheel set 13.

[0022] When assembling or disassembling the bogie 10, there is a task of checking the height relationship between the bogie frame 14 and the wheel set 13, including the positional relationship between the main motor 15 and the gear box 16, with the car body supported by the bogie 10. In this task, without actually supporting the car body on the bogie 10, a load equivalent to the load of the car body (hereinafter referred to as the "predetermined load") is applied to the bogie 10 using the bogie load device 100, and the elastic body 13b is maintained in a compressed state. If the bogie frame 14 and the wheel set 13 are in an appropriate height relationship, they are fixed to each other or released from the fixed state, and then application of the predetermined load is terminated.

[0023] The trolley load device 100 mainly comprises a pair of left and right rails 20 for loading and unloading the trolley 10, a trolley fixing device 21 for fixing the trolley 10 loaded via the rails 20, and a pair of left and right load applying mechanisms 30 for applying a predetermined downward load to the trolley 10 fixed to the trolley fixing device 21.

[0024] The pair of rails 20 are laid in a groove provided in the floor surface F along the front-rear direction, and a portion of the rails is divided into front and rear portions by a cart fixing device 21. The pair of rails 20 are arranged parallel to each other and separated in the left-right direction by approximately the same distance as the left-right distance between the wheels 12 of the cart 10, and the wheels 12 are placed on the rails.

[0025] The cart fixing device 21 is a device for positioning the cart 10 in the front-rear and left-right directions, and is configured to be movable up and down. When the cart fixing device 21 is in the lowest position, the upper surface 22 of the cart fixing device 21 forms the same plane as the floor surface F. In this state, a pair of rails 23 connecting the pair of rails 20 separated into front and rear are provided in grooves formed in the upper surface 22 of the cart fixing device 21.

[0026] The inner wall surfaces of the grooves in the left-right direction are provided with pressing members 24 that can protrude outward in the left-right direction. The pressing members 24 are arranged in a pair on the left and right so as to face the inner left and right sides of the pair of wheels 12. The pair of pressing members 24 is arranged for the front and rear wheel sets 13, respectively, for a total of four pressing members.

[0027] The pair of pressing members 24 are mechanically interlocked so that the amount of projection from the wall surface of the groove is the same for both. As a result, by pressing the pressing members 24 against the wheels 12 on the rails 23, the wheel set 13 is positioned in the left-right direction on the rails 23.

[0028] Rollers 25 are provided on the carriage fixing device 21 adjacent to the outer sides in the left-right direction of the pair of rails 23. The rollers 25 are formed in a cylindrical shape centered on a rotation axis in the left-right direction and are configured to be rotatable around the rotation axis. The rollers 25 are arranged in pairs symmetrically in the front-rear direction with respect to one pressing member 24, for a total of eight rollers in four sets.

[0029] Each pair of rollers 25 is rotatably supported by a support member 26 provided between the rollers 25. This support member 26 moves the rollers 25 up and down relative to the upper surface 22 of the cart fixing device 21 while keeping the heights of the pair of rollers 25 the same. When the wheel 12 is supported by the pair of rollers 25 moved upward, the wheel 12 rolls on the rollers 25, and the center of the wheel 12 in the front-rear direction is positioned at the middle position of the pair of rollers 25.

[0030] A series of positioning operations using the pressing member 24 and the roller 25 will be described. The operations of the pressing member 24 and the support member 26 in this operation are controlled by the control device 50 shown in Fig. 5 and are executed by the driving force from the power supply / hydraulic unit 56 shown in Fig. 5.

[0031] 1 and 2, in the positioning work, first, the support member 26 is lowered to a position where the rollers 25 do not interfere with the wheels 12 on the rails 23. Next, an operator or the like carries the cart 10 from the rails 20 onto the rails 23, and positions the wheels 12 above the pair of rollers 25. Thereafter, the pressing member 24 is pressed against the wheels 12, and the cart 10 is temporarily positioned in the left-right direction relative to the cart fixing device 21. After the temporary positioning, the pressing by the pressing member 24 is released, and the cart 10 is allowed to move on the rails 23.

[0032] Thereafter, the rollers 25 are raised by the support members 26, and the wheels 12 are supported by the four sets of rollers 25 so that all the wheels 12 are lifted off the rails 23. This positions the dolly 10 in the front-rear direction relative to the dolly fixing device 21. Furthermore, by pressing the pressing members 24 against the wheels 12 again, the dolly 10 is also positioned in the left-right direction relative to the dolly fixing device 21, and the dolly 10 is fixed to the dolly fixing device 21.

[0033] The load applying mechanism 30 applies a predetermined downward load to the cart 10 fixed to the cart fixing device 21. The load applying mechanism 30 will be described in more detail with reference to Figs. 1 to 4. The load applying mechanisms 30 are arranged symmetrically on both the left and right sides of the cart 10. Therefore, the load applying mechanism 30 on the right side will be described below, and a description of the load applying mechanism 30 on the left side will be omitted.

[0034] Fig. 3 is a partially enlarged cross-sectional view of the bogie load device 100 taken along line III-III in Fig. 2. Fig. 4 is a partially enlarged rear view of the bogie load device 100 as seen from the direction of arrow IV in Fig. 3. In both Fig. 3 and Fig. 4, the vicinity of the upper end portion 31a is shown enlarged. Fig. 4 also shows the load pad 40 in a cross section perpendicular to the front-rear direction, and a rear view of the vicinity of the air spring 17 of the bogie 10.

[0035] The load applying mechanism 30 includes a load pad 40 that comes into contact with the air spring 17 of the cart 10 to apply a predetermined load, and a pillar-like support portion 31 that rises vertically from the floor surface F to support the load pad 40. The load applying mechanism 30 further includes a guide rail 32, a slider 33, a bracket 34, connecting plates 35, 39, a traverse cylinder 36, and a load cylinder 37 to support the load pad 40 on the support portion 31 so as to be movable up, down, left, and right. The load applying mechanism 30 is basically formed symmetrically in the front-to-rear direction.

[0036] 1 and 2, the support portion 31 is formed in a square prism shape, with the upper end portion 31a bent in the horizontal direction. The support portion 31 is rotatably attached to the floor surface F so that the tip of the upper end portion 31a faces backward or inward in the left-right direction (toward the trolley 10). By facing the tip of the upper end portion 31a backward, the trolley 10 is less likely to interfere with the load applying mechanism 30 when the trolley 10 is carried in and out of the trolley load device 100, and a working space can be secured.

[0037] When the tip of upper end 31a faces inward in the left-right direction, it is located directly above air spring 17 of cart 10 fixed to cart fixing device 21. Unless otherwise specified, the following description will be given for the case where the tip of upper end 31a faces inward in the left-right direction.

[0038] 3 and 4, the upper end 31a is formed in a rectangular tubular shape, and an opening 31b is formed extending in the left-right direction, vertically penetrating the tip side of the upper wall. A notch 31c is formed in the lower part of the upper end 31a by cutting out a portion corresponding to the opening 31b.

[0039] The guide rails 32 are a pair of front and rear members fixed to the front and rear outer surfaces of the upper end portion 31a, respectively, and are formed to extend in the left and right direction. The guide rails 32 are formed long on both the front and rear sides with respect to the opening 31b and the cutout portion 31c.

[0040] The sliders 33 are a pair of front and rear members respectively attached to the pair of front and rear guide rails 32, and slide along the guide rails 32. A bracket 34 is fixed to each of the pair of front and rear sliders 33.

[0041] The bracket 34 includes a side wall portion fixed to the slider 33 and extending vertically, a bottom wall portion extending from the bottom end of the side wall portion outward in the front-rear direction (the opposite side to the top end portion 31a), and ribs rising vertically from the side wall portion and the bottom wall portion to connect the left and right sides of both. The rigidity of the bracket 34 is ensured by these respective portions.

[0042] The connecting plate 35 is a plate material that connects the lower wall portions of the pair of front and rear brackets 34. A through hole 35a that penetrates in the up-down direction is formed in the center of the connecting plate 35 in the front-rear direction at a position facing the opening 31b and the notch 31c. Furthermore, through holes 35b that penetrate in the up-down direction are formed in both ends of the connecting plate 35 in the front-rear direction at positions that overlap with the lower wall portions of the brackets 34.

[0043] The bracket 34 and the connecting plate 35 are configured to be movable in the left-right direction relative to the upper end 31a of the support part 31 by the guide rail 32 and the slider 33. Furthermore, since the load pad 40 is supported on the connecting plate 35 via the load cylinder 37 and the connecting plate 39, the load pad 40 is also configured to be movable in the left-right direction relative to the support part 31.

[0044] The traverse cylinder 36 is an actuator for moving the connecting plate 35 and the load pad 40, etc., in the left-right direction, and is composed of a hydraulic cylinder in this embodiment. The traverse cylinder 36 is disposed inside the upper end portion 31a. The traverse cylinder 36 includes a cylinder portion 36a fixed to the upper end portion 31a and extending in the left-right direction, and a rod 36b protruding from the inside of the cylinder portion 36a in the left-right direction.

[0045] The tip of the rod 36b is fixed to the connecting plate 35 via a plate material (not shown). By changing the amount of protrusion of the rod 36b from the cylinder portion 36a, the connecting plate 35 and the load pad 40, etc. move in the left-right direction relative to the upper end portion 31a. The amount of expansion and contraction of the pair of left and right lateral cylinders 36 (the amount of protrusion of the rod 36b) is controlled by a control device 50 described later so as to be the same.

[0046] The load cylinder 37 is an actuator for moving the load pad 40 fixed to the connecting plate 39 in the vertical direction relative to the connecting plate 35, thereby applying a predetermined load from the load pad 40 to the air spring 17. In this embodiment, the load cylinder 37 is configured by a hydraulic cylinder. The load cylinder 37 includes a cylinder portion 37a fixed to the connecting plate 35 and extending in the vertical direction, and a rod 37c protruding from the lower end of the cylinder portion 37a.

[0047] A flange 37b that projects radially outward is formed at the lower end of the cylinder portion 37a. This flange 37b is fixed to the upper surface of the connecting plate 35 around the through hole 35a. The cylinder portion 37a extends upward from the connecting plate 35, passes through the notch 31c and the opening 31b, and protrudes upward from the upper end portion 31a. This allows the stroke of the load cylinder 37 to be longer.

[0048] Rod 37c passes through through hole 35a and projects downward from connecting plate 35. The tip of rod 37c is fixed to the upper surface of connecting plate 39 via connecting member 37d. A load cell is built into connecting member 37d. The load cell is a sensor that measures the load value applied from load pad 40 to air spring 17.

[0049] A load pad 40 is fixed to the lower surface of the connecting plate 39. As a result, by changing the amount of expansion and contraction of the load cylinder 37 (the amount of protrusion of the rod 37c), the load pad 40 and the connecting plate 39 move in the vertical direction relative to the support part 31 and the connecting plate 35.

[0050] In addition, a guide cylinder 38a and a guide rod 38c are provided in the load applying mechanism 30 to guide this movement in the up-down direction. In this embodiment, a pair of front and rear guide cylinders 38a and guide rods 38c are provided at positions approximately equidistant from the upper end 31a. The guide cylinder 38a is a cylindrical member extending in the up-down direction. A flange 38b projects radially outward from the lower end of the guide cylinder 38a. The upper surface of the flange 38b is fixed to the lower surface of the connecting plate 35, and the guide cylinder 38a projects upward from the lower wall portion through the through hole 35b of the connecting plate 35 and a hole penetrating the lower wall portion of the bracket 34.

[0051] The guide rod 38c is a cylindrical member extending in the vertical direction. The guide rod 38c is inserted into the guide cylinder 38a and configured to be slidable in the vertical direction relative to the guide cylinder 38a. A flange 38d extending radially outward is attached to the lower end of the guide rod 38c. The guide rod 38c is fixed to the connecting plate 39 via the flange 38d. The guide cylinder 38a and the guide rod 38c as described above can stabilize the vertical movement of the connecting plate 39 relative to the connecting plate 35, and can stabilize the vertical movement of the load pad 40 relative to the support portion 31.

[0052] The load pad 40 is a member formed with rotational symmetry about the axis of the load cylinder 37. The load pad 40 includes a cylindrical main body centered on the axis, a disk-shaped upper flange protruding radially outward from the upper end of the main body, a disk-shaped lower flange 40a protruding radially outward from the lower end of the main body, and six plate-shaped ribs 40c protruding radially at equal intervals from the outer circumferential surface of the main body and connecting the upper flange and the lower flange 40a.

[0053] The upper surface of the load pad 40 (upper flange) is fixed to the connecting plate 39. The diameter of the lower flange 40a is larger than the diameter of the upper flange. Of the six ribs 40c, two ribs 40c provided on the left and right are each arranged parallel to the left-right direction.

[0054] The lower surface of the load pad 40 (lower flange 40a) is a surface that comes into contact with the upper surface 17a of the air spring 17 by the operation of the load cylinder 37, thereby applying a predetermined load to the air spring 17. When the load cylinder 37 is fully retracted and the cart fixing device 21 to which the cart 10 is fixed is fully raised (hereinafter referred to as the "load preparation state"), the lower surface of the load pad 40 is positioned above the protrusion 17b protruding from the upper surface 17a, and the two are separated so as not to interfere with each other.

[0055] A truncated cone-shaped recess 40b is formed in the radial center of the lower surface of the load pad 40. With this, when the lower surface of the load pad 40 and the upper surface 17a of the air spring 17 are abutted against each other with their radial centers aligned, the protrusion 17b protruding from the upper surface 17a is accommodated inside the recess 40b.

[0056] In this embodiment, the recess 40b is formed slightly larger in the radial direction than the protrusion 17b. As a result, even if the radial centers of the load pad 40 and the air spring 17 are slightly misaligned, the protrusion 17b can be accommodated in the recess 40b, and the lower surface of the load pad 40 can be brought into contact with the upper surface 17a.

[0057] The radial centers of the load pad 40 and the air spring 17 are configured to match in the front-rear direction by fixing the cart 10 to the cart fixing device 21 and directing the tip of the upper end 31a of the support part 31 inward in the left-right direction. Even if the type of cart 10 changes, the air spring 17 is basically disposed in the center of the cart 10 in the front-rear direction, so the centers of the load pad 40 and the air spring 17 match in the front-rear direction.

[0058] Meanwhile, the alignment of the centers in the left-right direction is performed by moving the load pad 40 in the left-right direction by the traverse cylinder 36. Here, the interval (pitch) between the pair of left and right air springs 17 may differ depending on the type of the bogie 10. In this embodiment, a case where there are two types of intervals will be described. In Fig. 4, the right air spring 17 with a short interval is shown by a solid line, and the right air spring 17 with a long interval is shown by a two-dot chain line.

[0059] Conventionally, an operator visually adjusts the distance between a pair of left and right load pads 40 to align the left and right positions of the load pads 40 and the air springs 17. If a predetermined load is applied from the load pads 40 to the air springs 17 while the left and right positions are misaligned, there is a risk of damage to the cart 10, the load pads 40, etc.

[0060] As a countermeasure to this, the bogie load device 100 of this embodiment is provided with an inner detection sensor 41 and an outer detection sensor 42 that detect the left-right positional deviation between the load pad 40 and the air spring 17. The inner detection sensor 41 and the outer detection sensor 42 are photoelectric sensors that detect the presence of an object within a predetermined detection range by emitting and receiving light. The inner detection sensor 41 is attached to a rib 40c on the inner side of the load pad 40 in the left-right direction. The outer detection sensor 42 is attached to a rib 40c on the outer side of the load pad 40 in the left-right direction.

[0061] A through hole 40d is formed in the lower flange 40a directly below the inner detection sensor 41 and the outer detection sensor 42, penetrating in the plate thickness direction. The inner detection sensor 41 and the outer detection sensor 42 each project light directly below the sensor through the through hole 40d. When the projected light is reflected by the upper surface 17a in the load preparation state, the inner detection sensor 41 and the outer detection sensor 42 each receive the reflected light, detect that the upper surface 17a is directly below them, and turn on. On the other hand, when the upper surface 17a is not directly below them in the load preparation state, the inner detection sensor 41 and the outer detection sensor 42 each turn off (not detected).

[0062] When the left and right positions of the air spring 17 and the load pad 40 shown by the solid lines in Fig. 4 are aligned, both the inner detection sensor 41 and the outer detection sensor 42 are turned on. From this state, if only the air spring 17 is moved to the position shown by the two-dot chain line, the outer detection sensor 42 remains on, but the inner detection sensor 41 is turned off. Conversely, if the air spring 17 is moved to the position shown by the solid line with the load pad 40 placed at a left and right position matching the air spring 17 shown by the two-dot chain line, the inner detection sensor 41 is turned on and the outer detection sensor 42 is turned off.

[0063] Therefore, when both the inner detection sensor 41 and the outer detection sensor 42 are on, it can be determined that there is no misalignment between the left and right positions of the air spring 17 and the load pad 40. On the other hand, when at least one of the inner detection sensor 41 and the outer detection sensor 42 is off, there is a risk that there is a misalignment between the left and right positions of the air spring 17 and the load pad 40.

[0064] 4 to 6, a control method for the bogie load device 100 using the detection results of the inside detection sensor 41 and the outside detection sensor 42 will be described. FIG. 5 is a block diagram showing the electrical configuration of the bogie load device 100.

[0065] The control device 50 of the cart load device 100 includes a CPU 51, a ROM 52, and a RAM 53. These are each connected to an input / output port 55 via a bus line 54. The input / output port 55 is further connected to a power supply / hydraulic unit 56, an operation panel 57, the cart fixing device 21, and each part of a pair of load applying mechanisms 30. Each part of the load applying mechanisms 30 includes a traverse cylinder 36, a load cylinder 37, an inside detection sensor 41, and an outside detection sensor 42.

[0066] The CPU 51 is a calculation device that controls each part connected by a bus line 54. The ROM 52 is a non-rewritable non-volatile memory that stores programs executed by the CPU 51, fixed value data, etc. Note that a storage device such as a flash ROM, SSD, or HDD may be used instead of the ROM 52. The RAM 53 is a memory for rewritably storing various work data, flags, etc. when the CPU 51 executes a program.

[0067] A control program 52a is stored in the ROM 52. When the control program 52a is executed by the CPU 51, a load application process shown in Fig. 6 is executed. This control program 52a (load application process) is executed in response to an operation of the operation panel 57 by an operator.

[0068] The power supply / hydraulic unit 56 is a device that sends driving forces such as electric power or hydraulic pressure to each part of the cart load device 100 (the cart fixing device 21, the pair of load applying mechanisms 30, etc.). For example, electric power is supplied from the power supply / hydraulic unit 56 to the control device 50, the operation panel 57, the inside detection sensor 41, etc. Also, hydraulic pressure is supplied from the power supply / hydraulic unit 56 to the traverse cylinder 36, the load cylinder 37, etc. via various valves that open and close based on electric signals from the control device 50.

[0069] The operation panel 57 is an input device that receives operations from an operator. After the carriage 10 is carried into the carriage loading device 100, when an operation for fixing the carriage 10 is performed by the operator on the operation panel 57, the carriage 10 is fixed to the carriage fixing device 21 as described above, and is in a loading preparation state. At this time, the traverse cylinder 36 is in the most contracted state.

[0070] Next, when the operator inputs the distance between the pair of left and right air springs 17 on the operation panel 57 and then performs an operation to start applying a predetermined load to the air springs 17, the load applying process of Fig. 6 is executed by the CPU 51. This load applying process will be described with reference to Fig. 4 and Fig. 6. Fig. 6 is a flowchart of the load applying process.

[0071] In the load application process, first, the pair of left and right lateral cylinders 36 are extended (S11) in accordance with the input pitch (spacing) between the air springs 17. For example, if the input pitch is as shown by the solid line in Fig. 4, the lateral cylinders 36 are extended until the left and right positions of the air springs 17 and the load pads 40 in the solid line are aligned.

[0072] After the process of S11, it is confirmed whether the two inner detection sensors 41 and the two outer detection sensors 42 are all on (S12). If they are all on (S12: Yes), it can be determined that the left and right positions of the air spring 17 and the load pad 40 are not misaligned on the left and right sides, so the load cylinder 37 is extended to bring the lower surface of the load pad 40 into contact with the upper surface 17a of the air spring 17 (S13).

[0073] Furthermore, in the process of S13, the load cylinder 37 presses the load pad 40 against the air spring 17 to apply a predetermined downward load. After the process of S13, it is confirmed whether the operator has performed an operation to release the load on the operation panel 57 (S14). If the operator has not performed the operation to release the load (S14: No), the state in which the predetermined load is applied to the air spring 17 is maintained. In this state, the operator performs the task of checking the height relationship between the bogie frame 14 and the wheel set 13.

[0074] When the work is completed and the application release operation is performed (S14: Yes), the application of the predetermined load by the load cylinder 37 is released and the load cylinder 37 is brought to its most contracted state (S15). Finally, in preparation for the next load application process, the traverse cylinder 36 is brought to its most contracted state (S16), and the current load application process is terminated.

[0075] If at least one of the two inner detection sensors 41 and two outer detection sensors 42 is off in the process of S12 (S12: No), there is a risk of misalignment between the left and right positions of the air spring 17 and the load pad 40. In this case, an error is notified to the worker using a display device, a speaker, or the like (not shown) (S17), the processes of S13 to S15 are skipped, and the process of S16 is executed, ending the load application process.

[0076] In this way, when at least one of the inside detection sensor 41 and the outside detection sensor 42 is off, the bogie load device 100 does not operate the load cylinder 37, thereby prohibiting the load cylinder 37 from applying a predetermined load. This makes it possible to prevent a load from being applied while the left-right positions of the load pad 40 and the air spring 17 are misaligned, and to prevent damage to the bogie 10, the load pad 40, etc. caused by incorrect adjustment of the left-right position of the load pad 40.

[0077] Furthermore, the inner detection sensor 41 and the outer detection sensor 42 can detect the air spring 17 in a load preparation state in which the protrusion 17b is located below the lower surface of the load pad 40. That is, the inner detection sensor 41 and the outer detection sensor 42 can detect the air spring 17 in a state in which the distance from the lower surface of the load pad 40 to the air spring 17 directly below each sensor is greater than the height of the protrusion 17b (depth of the recess 40b). This makes it possible to prohibit the load pad 40 from applying a load before the protrusion 17b comes into contact with the load pad 40, thereby making it difficult to damage the protrusion 17b and the load pad 40.

[0078] Here, when an operator manually inputs the distance between the pair of left and right air springs 17 on the operation panel 57, there is a risk that an input error will cause a slight deviation in the left and right positions of the load pad 40 and the air spring 17. In this case, depending on the amount of deviation, there is a risk that both the inner detection sensor 41 and the outer detection sensor 42 will be turned on.

[0079] In response to this, the bogie load device 100 is configured to select one of multiple types of intervals (two types in this embodiment) when inputting the interval between the pair of left and right air springs 17 on the operation panel 57. In addition, the intervals between the sensors are set so that when the load pad 40 is matched with one of the types, the air springs 17 of the remaining types are not detected by both the inner detection sensor 41 and the outer detection sensor 42. As a result, it is possible to prevent both the inner detection sensor 41 and the outer detection sensor 42 from being turned on while the left and right positions of the load pad 40 and the air spring 17 are slightly shifted due to an input error by the operator, etc. Therefore, damage to the bogie 10, the load pad 40, etc. due to an adjustment error in the left and right positions of the load pad 40 can be further prevented.

[0080] The left-right distance between the inner detection sensor 41 and the outer detection sensor 42 is preferably 70% or more, and more preferably 90% or more, of the diameter of the flat portion of the upper surface 17a of the air spring 17. The larger this ratio is, the more the inner detection sensor 41 and the outer detection sensor 42 can detect the vicinity of the left-right edge of the upper surface 17a. As a result, even if the difference in the distance between the pair of left and right air springs 17 according to the type of bogie 10 is small, it becomes easier to determine the left-right positional deviation between the load pad 40 and the air spring 17.

[0081] Next, a second embodiment will be described with reference to Fig. 7. In the first embodiment, a case where the load application process is executed after the distance between a pair of left and right air springs 17 is input on the operation panel 57 is described. In contrast, in the second embodiment, a case where the load application process is executed without inputting the distance is described. Note that the same parts as in the first embodiment are given the same reference numerals and the following description is omitted.

[0082] 7 is a flowchart of the load application process executed by the CPU 51 of the load device for a bogie in the second embodiment. The load device for a bogie in the second embodiment is different from the load device for a bogie 100 in the first embodiment in the interval between the inside detection sensor 41 and the outside detection sensor 42 and in part of the control method, but is otherwise configured the same.

[0083] In the second embodiment, the left-right distance between the inner detection sensor 41 and the outer detection sensor 42 is approximately the same as the diameter of the upper surface 17a of the air spring 17. "Approximately the same" means that when the upper surface 17a is detected by both the inner detection sensor 41 and the outer detection sensor 42, even if the left-right positions of the load pad 40 and the air spring 17 are slightly misaligned, the size is such that the protrusion 17b is accommodated in the recess 40b and the lower surface of the load pad 40 can abut against the upper surface 17a.

[0084] The load applying process in the second embodiment is executed when an operation to start applying a predetermined load to the air springs 17 is performed without inputting the interval between the pair of left and right air springs 17 in the load applying process in the first embodiment. Note that the load applying process is executed in a load preparation state with the traverse cylinders 36 contracted to the maximum extent.

[0085] In the load application process, first, the pair of left and right lateral cylinders 36 start to extend (S21). Next, it is confirmed whether both the inner detection sensor 41 and the outer detection sensor 42 provided on each load pad 40 are on (S22). If at least one of them is off (S22: No), the left and right positions of the load pad 40 and the air spring 17 are significantly misaligned, so the process of S22 is repeated and the lateral cylinders 36 continue to extend until both are on.

[0086] On the other hand, when both the inside detection sensor 41 and the outside detection sensor 42 are turned on (S22: Yes), the left-right positions of the load pad 40 and the air spring 17 are aligned to such an extent that the projection 17b can be accommodated in the recess 40b, so the extension of the traverse cylinder 36 is stopped (S23). After that, the processes of S13 to S16 are executed as in the first embodiment, and the load application process is terminated.

[0087] As described above, according to the bogie load device of the second embodiment, the pair of left and right load pads 40 and the pair of left and right air springs 17 are automatically aligned in the left and right positions, thereby prohibiting the load cylinder 37 from applying a load while they are misaligned. This makes it more difficult for damage to the bogie 10, the load pads 40, etc., caused by incorrect adjustment of the left and right positions of the load pads 40 to occur.

[0088] Moreover, the processes of S21 to S23 are performed separately for the left and right load applying mechanisms 30. As a result, for example, when the left and right positions of the load pad 40 and the air spring 17 are aligned on the left side but misaligned on the right side, it is possible to stop extension of the left traverse cylinder 36 while continuing extension of the right traverse cylinder 36. That is, even if the pair of left and right load pads 40 and air springs 17 are misaligned from their symmetrical positions due to installation errors or the like, it is possible to align the left and right positions of the load pads 40 and air springs 17 on each of the left and right sides.

[0089] Next, a third embodiment will be described with reference to Fig. 8. In the first and second embodiments, the case where the inside detection sensor 41 and the outside detection sensor 42 are used to determine whether the left and right positions of the load pad 40 and the air spring 17 are aligned is described. In contrast, in the third embodiment, a case where a proximity sensor 112 is used to determine whether the left and right positions of the load pad 40 and the air spring 17 are aligned is described. Note that the same reference numerals are used for the same parts as in the first embodiment, and the following description is omitted.

[0090] Fig. 8 is a partially enlarged rear view of the bogie load device 110 in the third embodiment, showing an enlarged view of the vicinity of the upper end portion 31a. In Fig. 8, the load pad 40 and the air spring 17 of the bogie 10 are shown in a cross section perpendicular to the front-rear direction.

[0091] The load-applying mechanism 111 of the trolley load device 110 is configured such that, compared to the load-applying mechanism 30 in the first embodiment, a proximity sensor 112 is provided instead of the inner detection sensor 41 and the outer detection sensor 42, and the through hole 40d of the lower flange 40a is omitted.

[0092] Furthermore, in the load applying mechanism 111, communication holes 113 are formed inside the load pad 40, which open to the bottom of the recess 40b and to the outer circumferential surface of the main body of the load pad 40. The opening of the communication hole 113 on the recess 40b side communicates with the opening of the supply / discharge hole 17c provided at the tip of the protrusion 17b of the air spring 17 when the protrusion 17b is accommodated in the recess 40b. This supply / discharge hole 17c is a flow path for supplying and discharging air inside the air spring 17.

[0093] A hose 114 is connected to the opening on the outer peripheral surface side of the communication hole 113. The bogie load device 110 is configured to apply a predetermined load from the load pad 40 to the air spring 17 in a state in which air is injected into the air spring 17 from the hose 114 via the communication hole 113 and the supply and exhaust hole 17c.

[0094] To prevent this air from leaking, the bogie load device 110 is configured so that the recess 40b of the load pad 40 and the protrusion 17b of the air spring 17 come into close contact with each other. Furthermore, in the bogie load device 110, in order to bring the recess 40b and the protrusion 17b into close contact with each other, the worker abuts the lower surface of the load pad 40 against the upper surface 17a of the air spring 17 while finely adjusting the lateral position of the load pad 40 relative to the air spring 17.

[0095] However, in this case, even if it appears to the worker that the air spring 17 and the load pad 40 are in contact, in reality the left and right positions of the air spring 17 and the load pad 40 are slightly misaligned, the recess 40b and the protrusion 17b are not in close contact, and the air spring 17 and the load pad 40 are not in contact. If a predetermined load is applied from the load pad 40 to the air spring 17 in this state, there is a risk of damage to the cart 10, the load pad 40, etc., especially the protrusion 17b.

[0096] As a countermeasure against this, the cart load device 110 is provided with a proximity sensor 112 that detects the left-right positional deviation between the air spring 17 and the load pad 40. The proximity sensor 112 is a limit switch that detects the presence of an object by means of a head 112a that hits the object and is pushed in. The proximity sensor 112 is fixed to the outer edge of the upper surface of the lower flange 40a so that the head 112a is positioned outside the outer edge of the lower flange 40a, and the head 112a protrudes slightly from the lower surface of the load pad 40 (lower flange 40a).

[0097] As a result, when the protrusion 17b is accommodated in the recess 40b and the lower surface of the load pad 40 is brought into contact with the upper surface 17a of the air spring 17, the head 112a is pushed upward by the upper surface 17a, and the proximity sensor 112 detects the upper surface 17a and turns on. On the other hand, if the left-right positions of the air spring 17 and the load pad 40 are misaligned, the head 112a does not contact the upper surface 17a, and the proximity sensor 112 turns off (not detected).

[0098] In the bogie loading device 110, as in the first embodiment, when the proximity sensor 112 is off, the application of a predetermined load from the load pad 40 by the load cylinder 37 to the air spring 17 is prohibited. This prohibition is performed by not operating the load cylinder 37 when the operator operates the load cylinder 37 to apply a predetermined load after the operator determines that the load pad 40 has been brought into contact with the air spring 17. With the above configuration, damage to the bogie 10, the load pad 40, etc., caused by incorrect adjustment of the left and right positions can be suppressed, and in particular damage to the protrusion 17b can be suppressed.

[0099] The present invention has been described above based on the above embodiment, but the present invention is not limited to the above embodiment, and it can be easily inferred that various modifications and improvements are possible within the scope of the present invention.

[0100] In the above embodiment, the traverse cylinder 36 and the load cylinder 37 are hydraulic cylinders, but this is not limiting. The traverse cylinder 36 and the load cylinder 37 may be electric cylinders or air cylinders, or may be actuators other than those having a cylindrical shape.

[0101] In the above embodiment, the inside detection sensor 41 and the outside detection sensor 42 are photoelectric sensors, but this is not limited to this. The inside detection sensor 41 and the outside detection sensor 42 may be configured by sensors using magnetism, sound waves, image processing, etc., as long as they can detect that the air spring 17 is directly below at a predetermined distance. Furthermore, the proximity sensor 112 is not limited to a limit switch, and may be configured by a photoelectric sensor with a narrow detection range, or a sensor using magnetism, sound waves, image processing, etc.

[0102] In the above embodiment, a case has been described in which the lower surface of the load pad 40 is brought into contact with the upper surface 17a of the air spring 17 to apply a predetermined load, but this is not limiting. The air spring 17 may be omitted, and the lower surface of the load pad 40 may be brought into contact with the seating surface 14a that supports the air spring 17, so that a predetermined load is applied from the load pad 40 to the seating surface 14a. In this case, the inner detection sensor 41, the outer detection sensor 42, and the proximity sensor 112 may detect the seating surface 14a instead of the air spring 17.

[0103] In the above embodiment, the case where the cart fixing device 21 is configured to be vertically movable has been described, but this is not limiting. The cart fixing device 21 may be configured to be unable to move vertically, and the support part 31 may be configured to be low. In this case, the load preparation state is a state in which the tip of the upper end part 31a of the support part 31 is directed inward in the left-right direction, and the load cylinder 37 is fully contracted. Note that, when the cart fixing device 21 is raised, applying a predetermined load to the cart 10 by the load applying mechanism 30, 111 makes it easier to carry out work with the predetermined load applied.

[0104] In the above embodiment, the inner detection sensor 41 and the outer detection sensor 42 are turned on if the upper surface 17a of the air spring 17 is located directly below the sensors in the load preparation state, but this is not limited to the above. The detection ranges of the sensors may be set so that the inner detection sensor 41 and the outer detection sensor 42 are turned on when the load cylinder 37 is extended to bring the load pad 40 closer to the air spring 17. In this case, when one of the inner detection sensor 41 and the outer detection sensor 42 is turned on and the other is turned off while the load cylinder 37 is being extended, the extension of the load cylinder 37 may be stopped and the application of a predetermined load by the load cylinder 37 may be prohibited.

[0105] In the above second embodiment, the extension of the traverse cylinder 36 is stopped when both the inside detection sensor 41 and the outside detection sensor 42 are turned on, but the present invention is not limited to this. For example, the extension amount of the traverse cylinder 36 may be determined from the timing when the inside detection sensor 41 and the outside detection sensor 42 are switched on and off.

[0106] Specifically, while the traverse cylinder 36 is being extended or retracted, the control device 50 acquires the amount of extension and retraction of the traverse cylinder 36 when one of the inside detection sensor 41 and the outside detection sensor 42 is switched from an ON state to an OFF state and both are switched to ON, and the amount of extension and retraction when one is switched to OFF and the other is switched to ON from an ON state. The centers of the load pad 40 and the air spring 17 coincide with each other when the average value is obtained by adding up and halving the amounts of extension and retraction at the time of the switching, and the average value is calculated by the control device 50. Next, the control device 50 adjusts the amount of extension and retraction of the traverse cylinder 36 to the average value. This makes it possible to automatically align the left and right positions of the load pad 40 and the air spring 17.

[0107] In the above first embodiment, a case has been described in which the load cylinder 37 is not operated when one of the inside detection sensor 41 and the outside detection sensor 42 is on and the other is off, but this is not limiting. For example, instead of not operating the load cylinder 37, the left-right positions of the load pad 40 and the air spring 17 may be automatically aligned as in the above second embodiment.

[0108] In the above-described second embodiment, the case where the left-right positions of the load pad 40 and the air spring 17 are automatically aligned in accordance with the detection results of the inner detection sensor 41 and the outer detection sensor 42 has been described, but the present invention is not limited to this. For example, the left-right positions of the load pad 40 and the air spring 17 may be automatically aligned by analyzing an image from a camera provided on the load pad 40 or the like.

[0109] In the above embodiment, the case where the inner detection sensor 41, the outer detection sensor 42, and the proximity sensor 112 are provided on both of the pair of load pads 40 has been described, but this is not limited thereto. For example, when the left and right load applying mechanisms 30, 111 operate symmetrically, it is not necessary to provide the sensors 41, 42, 112 on one of the pair of load pads 40 and to provide the sensors 41, 42, 112 on the other. This is because if one of the pair of left and right load pads 40 is misaligned with the air spring 17, the other will also be misaligned. Note that, when the inner detection sensor 41 and the outer detection sensor 42 are provided on only one of the load pads 40, in the process of S12, it is sufficient to check whether both the inner detection sensor 41 and the outer detection sensor 42 are on.

[0110] In the above first embodiment, the control device 50 controls the amount of extension and contraction of the pair of left and right lateral cylinders 36 to be the same, but this is not limited to the above. Since the air springs 17 in the first embodiment have two different intervals, the amount of extension and contraction of the lateral cylinders 36 may be controlled so that the load pad 40 stops at two positions, one on the inside and one on the outside in the left-right direction.

[0111] Specifically, for example, limit switches that are turned on when they come into contact with the load cylinder 37 or the connecting plate 35 are provided on both the left and right sides of the opening 31b or the notch 31c, and the amount of expansion and contraction of the traverse cylinder 36 is controlled by turning on and off the limit switches. When the interval between the air springs 17 is short, the traverse cylinder 36 can be extended and stopped when the limit switch on the inside in the left-right direction is turned on. On the other hand, when the interval between the air springs 17 is long, the traverse cylinder 36 can be contracted and stopped when the limit switch on the outside in the left-right direction is turned on. [Explanation of symbols]

[0112] 100,110 Loading device for trolley 10 Carts 13 wheel set 14 Bogie frame 14a Seat (pressure receiving surface) 17 Air spring 17a Top surface of air spring (pressure receiving surface) 17b Protrusion 31 Support part 36 Traverse cylinder (traverse actuator) 37 Load cylinder (load actuator) 40 Load Pad 40b Recess 41 Inside detection sensor (object detection sensor) 42 Outside detection sensor (object detection sensor) 112 Proximity Sensor S12,S17,S21~S23 Prohibited means

Claims

1. A bogie loading device for a bogie that includes a bogie frame provided with a pair of left and right seating surfaces that support a pair of left and right air springs from below, and axles that support the front and rear of the bogie frame, the device applying a downward load to a pair of the seating surfaces or a pair of pressure receiving surfaces that are upper surfaces of the pair of the air springs, A pair of load pads capable of contacting the pair of pressure receiving surfaces, respectively; a support portion that supports the pair of load pads so that the pair of load pads and the pair of pressure receiving surfaces are aligned in front-rear positions; a lateral actuator that moves the load pad in a left-right direction relative to the support portion; a load actuator that moves the load pad in a vertical direction relative to the support portion to apply a downward load from the load pad to the pressure-receiving surface; An inner detection sensor and an outer detection sensor are attached to both the left and right sides of at least one of the load pads, respectively, to detect the pressure-receiving surface located directly below the inner detection sensor and the outer detection sensor; A loading device for a bogie, characterized in that it is equipped with a prohibition means for prohibiting the load actuator from applying a load from the load pad to the pressure-receiving surface when at least one of the inner detection sensor and the outer detection sensor is not detecting the pressure-receiving surface.

2. the pair of pressure receiving surfaces are upper surfaces of the pair of air springs, a recess capable of accommodating a protrusion protruding from the center of an upper surface of the air spring is formed at the center of the lower surface of the load pad; The load device for a bogie as described in claim 1, characterized in that the inner detection sensor and the outer detection sensor are object detection sensors that can detect the air spring when the distance from the underside of the load pad to the air spring directly below the sensor is greater than the depth of the recess.

3. The load device for a bogie as described in claim 1, characterized in that the prohibiting means stops the movement of the load pad by the lateral actuator in response to the inner detection sensor and the outer detection sensor attached to the load pad detecting the pressure-receiving surface while moving the load pad by the lateral actuator.

4. A bogie loading device for a bogie that applies a downward load to an upper surface of a pair of air springs of a bogie that includes a bogie frame that supports a pair of left and right air springs from below and axles that support the front and rear of the bogie frame, a pair of load pads each having a lower surface capable of contacting an upper surface of the pair of air springs, and a recess formed in the center of the lower surface capable of accommodating a protrusion protruding from the center of the upper surface of the air spring; a support portion that supports the pair of load pads so that the pair of load pads and the pair of air springs are aligned in the front-rear direction; a lateral actuator that moves the load pad in a left-right direction relative to the support portion; a load actuator that moves the load pad in a vertical direction relative to the support portion to apply a downward load from the load pad to the air spring; a proximity sensor attached to at least one of the load pads and configured to detect the air spring in a state in which the lower surface of the load pad is in contact with the upper surface of the air spring while the protrusion is accommodated in the recess; a prohibition means for prohibiting the load actuator from applying a load from the load pad to the air spring when the proximity sensor is not detecting the air spring.

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