JP5585038B2 - Transport cart - Google Patents

Description

  The present invention relates to a transport carriage that effectively solves the problem of collision between a cabin and a carriage main body, which causes deterioration in ride comfort, and vibration and noise caused thereby.

  As this type of transport cart, one having a cabin at the end of the cart body is known.

  In particular, large transport carts that transport super-heavy transport materials such as steel, building materials, and large containers in various locations such as warehouses, tunnels, and harbors are loaded with heavy trucks. The surface is provided as wide as possible, and the cabin is provided so as to be suspended from the end of the cart body along the traveling direction. Since the work on such a vehicle takes a long time, it is essential to prevent the cabin from vibration.

  As a device for supporting such a cabin, a device using a spring element as shown in Patent Document 1 is considered.

Japanese Patent Laid-Open No. 9-109922

  By the way, a coil spring is generally employed for this type of spring element. And when employ | adopting such a coil spring, it is usual to install the stopper for restrict | limiting the stroke of a cabin between a cabin and the flame | frame of a trolley | bogie main body.

  However, if the effective stroke of the cabin is reduced due to this, when the cabin vibrates greatly during stepping, etc., the cabin frequently collides with the frame etc. via the stopper, resulting in large impact vibration and noise, resulting in poor ride comfort. There is a problem that causes In the meantime, since the stopper provides a buffering action when the cabin collides with the frame or the like, the stopper may not be removed. Although it is conceivable to increase the separation distance between the stopper and the frame, etc., especially as this type of transportation cart, the frame etc. of the cart body should be raised and lowered in order to sink under the cargo bed called pallet and lift it Since the cabin is supported by such a frame, the cabin will interfere with the ground when the frame of the carriage body is lowered to a low position when it is not running, if the separation distance is increased unnecessarily. There is a risk.

  The object of the present invention is to effectively solve such problems.

  In order to achieve this object, the present invention takes the following measures.

That is, the transport cart of the present invention includes a tire body and a frame that is supported by the tire portion so as to be movable up and down, a carriage body that can travel on the road, a cabin having a driver's seat, and the cabin suspended from the frame. Comprising a plurality of air springs arranged in series with the height direction as an operating direction between the cabin and the frame. cabin load spring has to act as a compressive force in series, and further connected to switching means for switching the supply state of the air in at least a portion of the air spring, utilizing expansion and contraction of the working direction of the air spring Therefore, in the first mode corresponding to the non-traveling state, the gap between the cabin and the frame above the cabin is reduced, and in the second mode corresponding to the traveling time, the cabin is Characterized in that to constitute a height adjusting mechanism of the cabin to increase the gap between the upper frame of the down and the cabin.

  With such a configuration, when the cabin vibrates greatly during traveling on a level difference and frequently collides with the main body of the carriage directly or via a stopper, the height of the cabin is changed through the switching means of the height adjustment mechanism. In other words, since the separation distance between the cabin and the cart body can be changed, while maintaining the suspension function by the air spring, vibration and noise due to the impact at the time of collision between the cabin and the cart body are avoided, and the ride quality is improved. Deterioration can be effectively prevented.

  In particular, in a transport cart that moves up and down so that the frame of the carriage body is in a low position when not traveling and is in a high position when traveling, the cabin is held at a high position when not traveling and the cabin is switched to a low position when traveling Thus, it is possible to effectively ensure the stroke of the cabin during traveling while avoiding interference between the cabin and the ground when not traveling.

  As described above, the present invention can change the cabin height with respect to the carriage body through the height adjusting mechanism, so that the collision frequency of the cabin with the carriage body can be reduced and the riding comfort can be effectively improved. Can do. Moreover, even if such a function is provided, there is no problem with the lifting function of the frame of the carriage body. Furthermore, since the height adjusting mechanism is configured by using a part of the support device that supports the cabin on the carriage main body, the structure becomes extremely simple.

The typical whole figure of the conveyance trolley concerning one embodiment of the present invention. The figure which shows the support apparatus of the cabin. FIG. 3 is a more specific configuration diagram of the support device of FIG. 2. The figure which shows the modification of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the transport cart according to this embodiment includes a cart main body 1 capable of traveling on the road and a cabin 2 attached to the cart main body 1.

  The cart body 1 has a high-strength frame 11 supported by a large number of tire parts 12 so as to be able to move up and down in order to transport super-heavy objects such as steel, building materials and large containers in warehouses, tunnels, and harbors. Composed. In other words, the transport cart 1 moves under a portal transport platform (not shown) called a pallet on which transported items are loaded, lifts it with a frame 11, and keeps the state. The frame 11 of the carriage main body 1 has a main horizontal frame portion 11b located at a position connecting the pair of hanging wall portions 11a and 11a as a main load region, and in addition to a tire portion 12 that controls a running function, an axle suspension spring 11c. And an elevating mechanism (not shown) are incorporated in a space under the carriage partially surrounded by the pair of hanging wall portions 11a and 11a and the main horizontal frame portion 11b. A part of the main horizontal frame portion 11b extends as an extension frame portion 11d outward from the hanging wall portion 11a, and it is also possible to load a load across the extension frame portion 11d and the main horizontal frame portion 11b. It is said that. In such a transport carriage, the cabin 2 is provided in pairs at the end in the traveling direction beyond the ground contact width by the tire portion 12 in order to ensure the maximum loading area.

The cabin 2 is arranged in a state of being suspended below the extension frame portion 11d of the bogie main body 1, and has a driver's seat 20 made up of a seat for operation by the operator and equipment necessary for the operation. Yes. That is, the cabin 2 is supported in an overhanging state by the extension frame portion 11 d in front of the hanging wall portion 11 a of the cart body 1 and is independent of the cart body 1.

  And in order to support such a cabin 2, as shown in FIG.2 and FIG.3, the air spring unit 3 which combined the air springs 31 and 32 which are spring elements between the said cabin and the trolley | bogie main body 1 is provided. The supporting device A is configured by using it.

  In addition, although illustration is abbreviate | omitted, in order to control the movement of the cabin 2 to the horizontal direction orthogonal to the advancing direction, the support apparatus A enables the movement of the cabin 2 in the perpendicular direction orthogonal to the advancing direction of the cart main body 1. A restricting member such as a link mechanism may be included.

  The air spring unit 3 of the present embodiment is disposed at a position that supports at least four points in the vicinity of the four corners of the cabin 2 in plan view between the top or side wall upper portion of the cabin 2 and the extension frame portion 11d of the carriage body 1. As shown in FIG. 2, each air spring unit 3 has air springs 31 and 32 arranged in series in the operating direction (vertical direction), and one end 3x in the operating direction is connected to the cart body 1. The other end 3y is connected to the cabin 2 so that the cabin load acts as a compressive force in series with the air springs 31 and 32. A stopper 30 for avoiding a direct collision between the cabin 2 and the extension frame portion 11d is provided in the gap between the air spring unit 3 and the extension frame portion 11d of the carriage body.

  As shown in FIG. 3, a controller 4 is provided as switching means for switching the air supply state to one air spring 31 constituting the air spring unit 3, and the air pressure to be supplied from the controller 4 to the air spring 31 is provided. Is controlled on and off.

  The controller 4 includes an electromagnetic valve 41 interposed between the compressed air source 5 and the internal space of the air spring 31, and a control unit 43 that controls the electromagnetic valve 41. 5 and the internal space of the air spring 31 are communicated with each other, the first switching position 41a for supplying compressed air to the internal space, and the compressed air source 5 and the internal space of the air spring 31 are cut off. A function of switching the flow path with the second switching position 41b that opens the internal space to the atmosphere is provided.

  As the compressed air source 5, an unillustrated cargo driving air pump (for example, an air pump for braking during cargo handling operation) provided in the carriage main body 1 can be used as an air supply source. When the air spring 31 is released from the atmosphere without being connected to the compressed air source 5, the air spring 31 exhales air and becomes a crushed state.

  The control unit 43 is composed mainly of a normal microprocessor including a CPU, a memory, and an interface. A command signal S is input to the CPU from an external command unit 4a via the interface. The memory stores a program and data necessary for executing a predetermined process according to a command. The CPU sequentially calls these programs and data from the memory, performs predetermined calculations and processing, and outputs an open / close signal S1 to the electromagnetic valve 41.

  Specifically, when the air spring 31 is to be turned on based on the command, the signal S1 input from the control unit 43 to the electromagnetic valve 41 connected to the air spring 31 causes the electromagnetic valve 41 to turn on. When the air spring 31 is to be turned off, the signal S2 input from the control unit 43 to the electromagnetic valve 41 connected to the air spring 31 is the electromagnetic valve. 41 is a signal for holding 41 at the second switching position 41b. When the solenoid valve 41 includes an offset spring, the signal S1 is an on / off signal.

  On the other hand, the command unit 4a is disposed at a position where it can be operated from the driver's seat 20 of the cabin 2, and inputs the command signal S to the control unit 43. When the cabin 2 is held at a high position, the first mode is selected. Is selected and the second mode can be selected when it is held at a low position.

  When the first mode is selected in the command unit 4a, the control unit 43 turns on the air spring 31. As a result, the cabin 2 has the stopper 30 extended from the cart body 1 as shown in FIG. When the second mode is selected in the command section 4a while being held at a position approaching the frame section 11b (gap d1), the control section 43 turns off the air spring 31. As a result, the cabin 2 is shown in FIG. ), The stopper 30 is held at a position away from the extension frame portion 11b of the carriage body 1 (gap d2).

  FIG. 2A shows the time when the transport cart is not running, and the extension frame portion 11d of the cart body 1 is in a low position, while FIG. 2B shows the time when the transport cart is running. Since the one extension frame portion 11d is at a high position, the bottom portion of the cabin 2 is at the same height h from the ground in any case.

  As described above, in the present embodiment, the support device A for supporting the cabin 2 on the carriage main body 1 is connected to the plurality of air springs 31 and 32 in series between the cabin 2 and the carriage main body 1 with the height direction as the operation direction. Further, the controller 4 which is a switching means for switching the air supply state is connected to the air spring 31, so that the height adjustment mechanism B of the cabin 2 utilizing the expansion and contraction operation in the operation direction of the air spring 31. (See FIG. 3).

  For this reason, when the cabin 2 vibrates greatly at the time of running on a step and the stopper 30 frequently collides with the extension frame portion 11d of the carriage main body 1, the height of the cabin 2 through the controller 4 of the height adjustment mechanism B, That is, since the separation distance d between the stopper 30 attached to the cabin 2 and the extension frame portion 11d of the carriage main body 1 can be changed, the suspension function by the air spring 32 is always maintained, and the cabin 2 and the carriage main body 1 are separated. By avoiding vibration and noise caused by impact at the time of a collision, it is possible to effectively prevent deterioration in riding comfort.

  In particular, the extension frame portion 11d of the carriage body 1 is in a low position as shown in FIG. 2A when not traveling, and is in a high position as shown in FIG. In this type of transport cart in which the cabin 2 is supported, the cabin 2 is held at a high position as shown in FIG. 2A with respect to the extension frame portion 11d when not traveling, and the cabin 2 is extended when traveling. By switching to a lower position as shown in FIG. 11B with respect to the portion 11d, a clearance h between the cabin 2 and the ground during non-running is ensured and interference with the ground is avoided while running. The gap d2 between the stopper 30 and the extension frame portion 11d is made larger than the gap d1 when the vehicle is not running, so that the stroke of the cabin 2 can be effectively secured.

  The specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above embodiment, the air pressure of the air spring 31 positioned in the upper stage is changed, but the air spring 32 positioned in the lower stage may be changed, or three or more air springs may be connected in series, The air pressure of some air springs may be changed.

  Moreover, in the said embodiment, although the ON / OFF state of the air pressure with respect to an air spring was switched with the controller which is a switching means, and the height adjustment mechanism B was comprised, the air pressure was changed with a controller and the height adjustment mechanism was comprised. You can also. For example, in the example shown in FIG. 4, the air pressure for one of the air springs 132 is set higher than the air pressure during travel as shown in FIG. In this way, even if the air pressure of the air spring 132 is controlled to be the same as the air pressure of the other air spring 131, the distance d between the stopper 30 attached to the cabin 2 and the extension frame portion 11 d of the carriage body 1. Since d1 and d2 can be changed, the same effect as the above embodiment can be obtained.

A ... Support device B ... Height adjustment mechanism 1 ... Dolly body 2 ... Cabin 4 ... Switching means (controller)
31, 32 ... Air spring

Claims (1)

A trolley body including a tire portion and a frame supported by the tire portion so as to be able to move up and down, a cabin having a driver's seat, and a support device for supporting the cabin in a state of being suspended from the frame. The supporting device comprises a plurality of air springs arranged in series between the cabin and the frame with the height direction as an operating direction, and a cabin load is compressed in series with each air spring. In addition, the switching means for switching the air supply state is connected to at least a part of the air spring, and the expansion and contraction operation in the operating direction of the air spring is used to cope with the non-traveling time. In the first mode, the gap between the cabin and the frame above the cabin is reduced, and in the second mode corresponding to the traveling time, the cabin and the frame above the cabin are Transport vehicle, characterized in that to constitute a height adjusting mechanism of the cabin to increase the gap between the arm.

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