JP5421031B2 - Heavy goods cart - Google Patents

Description

  The present invention relates to a heavy-duty conveyance cart that can be moved and turned.

  2. Description of the Related Art Conventionally, there is known a heavy-duty conveyance carriage in which a caster and a driving turn wheel are mounted on a loading platform on which a heavy object can be placed, and can be moved and turned by the caster (see, for example, Patent Document 1). . In this heavy goods transport cart, the caster supports the cargo bed, makes the height of the cargo bed substantially constant regardless of the weight of the heavy material, and receives most of the load. The drive diverting wheel is supported by a support member extending downward from the loading platform via a link mechanism so as to be lifted and lowered, and is pressed against the road surface by a spring via the link mechanism, and a wheel load is applied.

  The heavy object is supported by a lifter device provided on the loading platform. The load received by this lifter device is distributed and applied to the loading platform and the driving diverting wheel by a link structure different from the above, and the wheel load of the driving diverting wheel is adjusted appropriately according to the presence or absence of heavy objects and their weight. Is done. Thereby, regardless of the presence or absence of a heavy object or its weight, idling or skidding of the drive diverting wheel can be prevented, and the loading platform can be reliably moved or diverted.

  However, in the heavy-duty conveyance cart described above, when the loading platform is a flat loading platform or a conveyor platform, the lifter device becomes an obstacle when loading or unloading heavy loads, and it may be difficult to work.

JP 2006-103514 A

  The present invention has been made in order to solve the above-described conventional problems, and it is possible to reliably move or turn the loading platform regardless of the presence or absence of a heavy load, and to load the heavy load. An object of the present invention is to provide a heavy-duty conveying cart that can be easily put on or taken down.

In order to achieve the above object, according to the first aspect of the present invention, a load carrier on which a heavy object can be placed is supported by a caster and a drive diverting wheel in such a manner that the load is distributed. In a heavy-duty transport carriage that can be moved and turned, a detecting means for detecting the presence or weight of a heavy article on the loading platform, and a wheel load of the drive turning wheel according to a detection result by the detecting means equipped with an adjustment mechanism for adjusting, the adjusting mechanism, the loading platform of the provided below, seesaw rotatably supported by a supporting member extending downwardly from said loading platform, said drive換向A link arm that supports the wheel at one end, and a pedestal attached to the support member and the other end of the link arm in order to generate a wheel load of the drive diverting wheel that is required when there is no load. Provided with the other end raised Is provided between the spring or the spring and the pedestal and the other end, and the other end of the link arm is moved up and down according to the detection result of the detection means, and the wheel load of the driving diverting wheel is increased. And a cylinder to be adjusted, and a rod of the cylinder is provided with an elastic body that lifts and biases the other end.

In the invention described in claim 2, a load bed on which a heavy object can be placed is supported by a caster and a drive diverting wheel in such a manner that the load is distributed, and can be moved and diverted by the caster and the drive diverting wheel. In the heavy-duty carriage, the detection means for detecting the presence or the weight of the heavy load on the cargo bed, and the adjustment mechanism for adjusting the wheel load of the driving diverting wheel according to the detection result by the detection means The adjustment mechanism is provided below the loading platform, is supported by a support member extending downward from the loading platform so that the seesaw can freely rotate, and the drive diverting wheel is at one end. In order to generate a wheel load of the link arm to be supported and the drive diverting wheel necessary when there is no load , the link arm is provided between a base attached to the support member and the other end of the link arm, and the other A spring or an upward biasing end A spring, one end on the upper surface of the other end is connected freely raised or lowered, and the link member and the other end is connected to the elastic body to draw the other end, the one end and the other end of the link member and the pedestal It is provided between the position between, and a cylinder for adjusting the wheel load of the driven換向wheels by lifting actuating the other end of the link arm in accordance with the detection result by said detecting means The cylinder rod is configured to slide on the link member as it moves up and down.

According to the present invention , since the wheel load of the drive diverting wheel is adjusted in accordance with the presence or absence of a heavy load, or the weight thereof, the drive diverting wheel slips or skids regardless of the presence or absence of a heavy load. Can be prevented, and the loading platform can be reliably moved or turned. In addition, since an adjustment mechanism for adjusting the wheel load is located below the loading platform, it is easy to load or unload heavy objects on the loading platform.

Further, since the wheel load of the driving diverting wheel can be generated and adjusted by the elastic body , the effect of preventing the idling or skidding of the driving diverting wheel is enhanced.

The side view of the loading state of the heavy-duty conveyance trolley | bogie which concerns on one Embodiment of this invention. FIG. 3 is an enlarged side view of a drive turning wheel device and a carrier device portion of the heavy goods transport carriage. The perspective view from the front direction of the said drive diversion wheel apparatus. The perspective view from the back direction of the above-mentioned drive turning wheel device. The side view for demonstrating operation | movement of the said drive turning wheel apparatus. The electric block diagram of the said trolley | bogie. The side view of the drive turning wheel apparatus part of the heavy-duty conveyance trolley | bogie which concerns on the modification of the said embodiment. The side view for demonstrating operation | movement of the said drive turning wheel apparatus.

  Hereinafter, a heavy-duty conveyance cart (hereinafter referred to as a cart) according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the configuration of the carriage of this embodiment. The cart 1 includes a loading platform 3 on which a heavy object 2 can be placed, a caster device 4 that supports the loading platform 3 and receives a load on the loading platform 3, and a drive turning wheel device 5 that is mounted on the loading platform 3. The caster device 4 and the drive turning wheel device 5 can be moved and turned.

  The loading platform 3 is, for example, a flat rectangular loading platform in plan view, but may be a conveyor platform or the like. The caster device 4 includes a caster 40 that is a free wheel, and four units are arranged so that the loading platform 3 can be supported substantially horizontally (two are not shown). These caster devices 4 make the height of the loading platform 3 substantially constant regardless of the weight of the heavy load 2. The drive turning wheel device 5 includes a turnable drive turning wheel 50 that is rotationally driven, and one drive turning wheel device is disposed at each of the left and right ends in the figure. The number of caster devices 40 and drive turning wheel devices 5 is not limited to the above.

  In addition, the cart 1 generates a wheel load on the detection sensor 6 (detection means) that detects the presence and weight of the heavy object 2 on the loading platform 3 and its weight, and the detection by the detection sensor 6. An adjustment mechanism 7 that adjusts the wheel load with the caster 40 according to the result is provided. The adjustment mechanism 7 is provided below the loading platform 3.

  The detection sensor 6 can be constituted by a load cell, and is disposed under the heavy article placement plate 30 provided on the upper surface of the loading platform 3. The adjustment mechanism 7 applies the load of the loading platform 3 to the caster 40 and the driving switching wheel 50 by generating the wheel load of the driving switching wheel 50, whereby the loading platform 3 is connected to the caster 40 and the driving switching wheel 50. To be supported by. Further, the adjusting mechanism 7 adjusts the ground load of the driving diverting wheel 50 by adjusting the wheel load of the driving diverting wheel 50, and prevents the idling thereof.

  2 to 4 show the configuration of the drive turning wheel device 5 and the adjustment mechanism 7. The drive turning wheel device 5 is attached to the above-described drive turning wheel 50, a bearing member 51 that rotatably supports a wheel shaft (not shown) of the driving turning wheel 50, and the bearing member 51. A wheel shaft rotating device 52 that rotates the shaft, and a main body 53 that covers the drive diverting wheel 50, the bearing member 51, and the wheel shaft rotating device 52 are provided.

  The drive diverter device 5 extends upward from the bearing member 51 and passes through the upper surface of the main body 53, the driven gear 55 fixed to the upper portion of the vertical axis 54, and the driven gear 55. An endless chain 56, a drive gear 57 over which the chain 56 is stretched, a gear rotating device 58 attached to the main body 53 and rotating the drive gear 57, and a chain 56 are spanned, and the tension of the chain 56 is set to a predetermined value. And a tension gear 59 for maintaining the tension. The movement of the main body 53 is restricted so as not to slide up and down along the vertical axis 54. The rotational driving force of the drive gear 57 is transmitted to the driven gear 55 by the chain 56, whereby the vertical axis 54 and the bearing member 51 are driven and rotated, and as a result, the drive diverting wheel 50 is diverted.

  Here, the structure of the loading platform 3 portion to which the adjusting mechanism 7 is attached will be described. In this portion, a substantially plate-like support member 31 extends downward from the lower surface of the loading platform 3, and a pair of protruding pieces 32 protrude from the front surface of the support member 31 and face each other. Further, an opening 33 penetrating from the front surface to the back surface is formed in the upper portion of the support member 31, and a pedestal 34 projects from a portion below the opening 33 on the back surface of the support member 31.

  The adjustment mechanism 7 is supported by the projecting piece 32 so as to freely rotate the seesaw, and a link arm (hereinafter referred to as an arm) 70 that rotatably supports the main body 53 of the drive diverting wheel device 5 at one end portion. A spring 71 that lifts and biases the other end of the arm 70 to generate a wheel load of the wheel 50; and a cylinder 72 that moves the other end of the arm 70 up and down to adjust the wheel load of the drive diverting wheel 50; Have This wheel load adjustment is performed according to the detection result by the detection sensor 6. The spring 71 generates a wheel load of the driving diverting wheel 50 that is necessary when there is no load, that is, when the heavy load 2 is not loaded.

  An arm 73 that is substantially parallel to the arm 70 is disposed below the arm 70, one end of the arm 73 rotatably supports the main body 53, and the other end is rotatably connected to the protruding piece 32. Yes. One set of arms 70 and 73 is provided for each projecting piece 32, and both the arm 70 and the arm 73 are disposed at opposing positions, and these allow the main body 53 to be moved up and down.

  Opposing arms 70 are connected by a shaft 74, and a movable piece 75 (the other end of the arm 70) is integrally formed on the shaft 74. The shaft 74 is positioned in front of the opening 33 of the support member 3, and the movable piece 75 protrudes from the opening 33 of the support member 3 in the back direction. The movable piece 75 is formed by providing a reinforcing rib 75 b on the upper surface of the plate-like member 75 a, and the rib 75 b is integrally formed with the shaft 74. The pedestal 34 of the support member 31 is substantially vertically below the movable piece 75, and a spring 71 and a cylinder 72 are attached between them. The spring 71 biases the movable piece 75 upward. The rod 72a of the cylinder 72 is connected to the movable piece 75 and adjusts the vertical position of the movable piece 75.

  Between the rod 72a and the movable piece 75, a spring 76 (elastic body) for generating and adjusting the wheel load of the drive diverting wheel 50 is provided. The spring 76 is housed in a storage 75 c in which the lower surface of the movable piece 75 is recessed upward and urges the movable piece 75 upward.

  As shown in the figure, when the heavy object 2 is not loaded on the loading platform 3, the movable piece 75 is pushed up by the urging force of the springs 71 and 76, the arm 70 is rotated by the seesaw, and the drive turning wheel device 5 is placed on the road surface. The wheel load is generated in the driving diverting wheel 50 by being pressed. The wheel load is set to such an extent that the driving turn wheel 50 can be prevented from slipping and skidding when the loading platform 3 moves in an unloaded state, and the biasing force of the springs 71 and 76 is determined in advance according to this value. It has been. When not loaded, the rod 72a of the cylinder 72 is in a free state. The movable piece 75 is, for example, substantially horizontal in the unloaded state.

  FIG. 5 shows a state in which the heavy object 2 is loaded on the loading platform 3. In this state, the rod 72a of the cylinder 72 is in a driving state in which the expansion / contraction amount is held at a predetermined value. The rod 72a is extended by a predetermined amount, and the movable piece 75 is raised as compared with the above unloaded state by the reaction force obtained by compressing the spring 76 by this extension and extension and the urging force of the spring 71. As a result, the arm 70 rotates in a seesaw, and the wheel load of the drive diverting wheel 50 is increased compared to the unloaded state.

  FIG. 6 shows the electrical configuration of the carriage 1. The carriage 1 includes an operation unit 8 operated by a user, and a control unit 9 that performs operation control of the wheel shaft rotation device 52 and the gear rotation device 58 based on an operation signal output from the operation unit 8. The operation unit 8 can be configured by buttons, switches, touch panels, and the like. The control unit 9 is constituted by a microprocessor or the like, and controls the rotation speed of the drive diverting wheel 50 by operation control of the wheel shaft rotation device 52, and controls the rotation speed or rotation speed of the drive gear 57 by operation control of the gear rotation device 58. Thus, the turning angle or turning speed of the drive turning wheel 50 is controlled.

  Further, the control unit 9 determines whether the detection value by the detection sensor 6 is greater than or less than a predetermined value, thereby detecting whether or not the heavy object 2 is loaded. The rod 72a is in a free state. When the control unit 9 detects that the heavy object 2 is in a loaded state, the control unit 9 sets the cylinder 72 in a driving state, detects the weight of the heavy object 2, and expands and contracts the rod 72a by an amount corresponding to the weight. Hold in state.

  In the cart 1 of the present embodiment as described above, the wheel load of the drive diverting wheel 50 is adjusted according to the presence or absence of the heavy object 2 or the weight thereof. Accordingly, it is possible to prevent the drive turning wheel 50 from slipping or slipping, and the loading platform 3 can be reliably moved or turned. Further, since the adjusting mechanism 7 for adjusting the wheel load is located below the loading platform 3, it is easy to put the heavy load 2 on the loading platform 3 or to drop it from the loading platform 3.

  Further, since the wheel load of the driving diverting wheel 50 can be generated and adjusted by the spring 76, the effect of preventing the idling or skidding of the driving diverting wheel 50 is enhanced. Further, since vibration transmitted from the drive diverting wheel 50 to the cylinder 7 can be absorbed by the spring 76 provided therebetween, failure of the cylinder 7 can be suppressed.

  Next, a cart 1 according to a modification of the above embodiment will be described with reference to FIGS. 7 and 8. FIG. 7 shows a configuration of the adjusting mechanism 7 of the cart 1 according to this modification. The illustrated state is a state in which the heavy object 2 is not loaded on the loading platform 3. The adjustment mechanism 7 of this modification has a link member 77 connected to the upper surface of the movable piece 75 so that it can be tilted up and down, and a spring 76 that draws the link member 77 toward the movable piece 75 is engaged at the tip of the link member 77. The link member 77 is pushed up and supported from below by a rod 72a protruding from the movable piece 75.

  The spring 76 has a tensile biasing force, and is stored and locked in a storage 75 c formed on the lower side of the movable piece 75. The spring 76 is disposed on the opposite side of the connecting portion between the movable piece 75 and the link member 77 with the cylinder 72 interposed therebetween. The rod 72 a protrudes from a hole 75 d formed in the movable piece 75 and is connected to the link member 77. The connecting portion with the link member 77 at the tip of the rod 72a is configured to slide on the link member 77 as the rod 72a moves up and down so that the rod 72a does not bend in the horizontal direction.

  FIG. 8 shows a state in which the heavy object 2 is loaded on the loading platform 3. In this state, the rod 72 a extends by a predetermined amount as compared with the unloaded state, the link member 77 is pushed up, and the movable piece 75 is lifted by the spring 76. As a result, the arm 70 rotates in a seesaw, and the wheel load of the drive diverting wheel 50 is increased compared to the unloaded state. The vibration transmitted from the drive turning wheel 50 to the arm 70, the link member 77, and the cylinder 72 is absorbed by the spring 76.

  In the cart 1 of this modification, the spring 76 and its storage 75c are provided on the lower side of the movable piece 75, so that the movable piece 75 and its movable piece 75 are compared with the embodiment in which they are above the movable piece 75. It is possible to narrow the space between the cargo bed 3 located above and the vehicle height. For this reason, the design freedom of a vehicle body increases. Also in this modification, the same effect as the above-mentioned embodiment can be produced.

  In addition, this invention is not limited to the structure of said embodiment, A various deformation | transformation is possible according to a use purpose. For example, the detection sensor 6 is a wheel load detection sensor that detects the wheel load of the caster 40 or the driving diverting wheel 50 before adjusting the wheel load by a load sensor that is installed on the loading platform 3 and detects the presence or absence of the heavy load 2. And a microprocessor that calculates the weight of the heavy object 2 from the detection result. A strain gauge is attached to a support member that rotatably supports the caster 40, and the strain of the support member corresponding to the weight of the heavy object 2 is measured by the strain gauge, and the weight of the heavy object 2 is calculated based on the measurement result. It may be calculated.

  Further, a spring may be provided in place of the spring 71, or a spring or a cushioning material made of urethane may be used in place of the spring 76. Further, instead of the operation unit 8, a guidance sensor for detecting a guidance path on the road surface may be provided, and based on the detection result, movement and turning of the loading platform 2 may be automatically controlled.

DESCRIPTION OF SYMBOLS 1 Heavy goods conveyance trolley 2 Heavy goods 3 Loading platform 30 Support member 4 Caster apparatus 40 Caster 5 Drive diverting wheel apparatus 50 Driving diverting wheel 6 Detection sensor (detection means)
7 Adjustment mechanism 70 Link arm 71 Spring 72 Cylinder 76 Spring (elastic body)

Claims (2)

In the heavy-duty conveyance carriage in which a load platform on which a heavy object can be placed is supported by a caster and a drive diverting wheel in a distributed manner and can be moved and diverted by the caster and the drive diverting wheel. detection means for detecting the presence or weight of the heavy article above, and and an adjusting mechanism for adjusting the wheel load of the drive換向wheels according to the detection result by said detecting means,
The adjusting mechanism, the loading platform of the provided below, seesaw rotatably supported by a supporting member extending downwardly from said loading platform, and the link arm that supports the drive換向wheel at one end, no In order to generate the wheel load of the drive diverting wheel necessary for loading, it is provided between the pedestal attached to the support member and the other end portion of the link arm, and lifts and biases the other end portion. A spring or a spring is provided between the pedestal and the other end, and the other end of the link arm is moved up and down according to the detection result of the detection means to adjust the wheel load of the drive diverting wheel. A heavy-duty conveyance carriage , wherein the cylinder rod is provided with an elastic body that lifts and biases the other end . In the heavy-duty conveyance carriage in which a load platform on which a heavy object can be placed is supported by a caster and a drive diverting wheel in a distributed manner and can be moved and diverted by the caster and the drive diverting wheel. detection means for detecting the presence or weight of the heavy article above, and and an adjusting mechanism for adjusting the wheel load of the drive換向wheels according to the detection result by said detecting means,
The adjusting mechanism, the loading platform of the provided below, seesaw rotatably supported by a supporting member extending downwardly from said loading platform, and the link arm that supports the drive換向wheel at one end, no In order to generate the wheel load of the drive diverting wheel necessary for loading, it is provided between the pedestal attached to the support member and the other end portion of the link arm, and lifts and biases the other end portion. A spring or a spring, a link member having one end connected to the upper surface of the other end portion so as to be tiltable and the other end connected to an elastic body that draws to the other end portion, the pedestal and the one end of the link member; A cylinder that is provided between the other ends and adjusts the wheel load of the drive diverting wheel by moving the other end of the link arm up and down according to the detection result of the detection means. The cylinder Heavy transport carriage rod, characterized in that it is configured to slide the link member with the elevator.

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