JP3668619B2 - Lorry - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lorry that supports a cargo mounting body in a slidable manner and reduces the load on a lifting frame lifting means that can be tilted.
[0002]
[Prior art]
In general, as a vehicle that facilitates the loading and unloading of various types of cargo including transported vehicles, the body on which the cargo is to be loaded is placed horizontally at the same height as the ground, and after loading the cargo in this state, the body is pulled together. There are known trucks that are to be lifted (see JP-A-3-279038, JP-A-4-166435, JP-A-4-218440, etc.). In this lorry, a body is slidably disposed on a lift frame that is provided so as to be tiltable by a lifting means around a fulcrum member at the rear end of the body frame, and the body is in a state in which the lift frame is tilted. The body is loaded and unloaded by sliding it back and forth with a slide motor and chain.
[0003]
By the way, when the lift frame is tilted in order to load and unload the body, the position of the center of gravity of the cargo including the body is not taken into consideration. That is, in the lowering operation of the body, the lift frame is first tilted backward, and then the body is slid backward. In the loading operation of the body, the lift frame is returned to the retracted state after the body is completely pulled up to the lift frame inclined backward.
[0004]
[Problems to be solved by the invention]
However, if the lift frame is lifted without the body being slid, loading and unloading can be performed basically by two operations of lifting the lift frame and sliding the body. However, the center of gravity of the cargo including the body is the fulcrum member of the lift frame. A large load acts on the hoisting means because it is located farthest from the front (the front side of the lorry). For this reason, a high output lift cylinder or the like is required as a lifting means.
[0005]
An object of the present invention is to reduce the cost of the lifting means with low output by avoiding as much load as possible on the lifting means of the lift frame when loading and unloading the body.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a lorry according to the present invention is a fulcrum member whose front end is supported up and down by a lifting means disposed between the vehicle body frame and whose rear end is disposed on the vehicle body frame. A lift frame supported by the vehicle, an engagement member disposed so as to reciprocate in the front-rear direction along the lift frame, and a cargo mounting body that can be pulled onto the lift frame by being pulled by the engagement member. And a sensor for detecting that the center of gravity position of the cargo including the body has reached a predetermined position close to the fulcrum member, and a control means for driving the lifting means based on a signal from the sensor.
[0007]
In the lorry configured as described above, the lift frame is driven up and down while the center of gravity of the cargo including the body is close to the fulcrum member, so that the load on the lifting means is reduced and a small output is achieved. The lift frame can be raised and lowered even with the lift cylinder.
The “predetermined position close to the fulcrum member” is preferably a predetermined position immediately after passing the fulcrum member. As a result, the weight of the lift frame and the weight of the cargo including the body are balanced, and the lift frame can be driven up and down with as low a load as possible.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 (A) to 1 (F), a truck 1 according to the present invention has a lift frame 2 on which a body 47 can be mounted and tilted. The lift frame 2 is moved up and down on the front end side by a conventionally known lifting device. The lifting device is, for example, a hydraulic lift cylinder 4 pivotally supported by the vehicle body frame 3 and the lift cylinder 4. And a swing arm 5 pivotally supported by the vehicle body frame 3 on the rear side of the lift cylinder 4 and having an intermediate portion pin-coupled to the piston rod tip of the lift cylinder 4 and a tip portion pin-coupled to the lift frame 2. Consists of. A guide roller 6 as a fulcrum member is disposed at the rearmost end portion of the vehicle body frame 3, and the lower surface of the rear end side of the lift frame 2 is supported by the guide roller 6 so as to be slidable back and forth.
[0009]
As shown in detail in FIGS. 2 (A) and 2 (B), the lift frame 2 has two parallel rail sections 8 in which steel plates having a U-shaped cross section face each other and are interconnected by a plurality of connecting members 7. Sprockets 9 and 10 are disposed at both front and rear ends of the rail portion 8 and between the rail portion 8. An endless chain 11 stretched between the sprockets 9 and 10 is driven by a slide motor 9 A that drives the front sprocket 9. A slide hook (not shown) as an engaging member is attached to the endless chain 11, and the front end of the body 47 can be detachably engaged with the slide hook.
[0010]
On both the left and right sides of the rear side of the lift frame 2, overhang members 13 having a downward guide surface 12 supported by the above-described guide roller 6 are fixed over a predetermined length. A grounding roller that also serves as a support for the body 47 is disposed at the rearmost end of the overhang member 13 so as to protrude horizontally in the left-right direction of the lift frame 2.
The above-described lift cylinder 4 and slide motor 9A are automatically controlled by control means provided in the driver's seat, and this control means is functionally represented by the flowchart of FIG. Some conditional branches in this flowchart are processed by signals from the limit switches LS1 to LS5 in FIG.
[0011]
The cargo vehicle is constructed as described above, and the loading and unloading operation of the body 47 or cargo by this cargo vehicle will be described with reference to the flowcharts of FIGS. Here, in FIGS. 1A to 1F, black circles (●) indicate the body 47 or the center of gravity C of the cargo, and steps S1 to S23 in FIG. 3 indicate the following contents.
S1 ... main switch operation S2 ... is the "lowering" push button being pressed S3 ... is the limit switch LS2 detected? S4 ... slide motor lowered S5 ... is the limit switch LS3 detected? S6 ... slide motor stopped, lifted Cylinder 4 elongation S7 ... is the limit switch LS4 detected? S8 ... lift cylinder 4 stopped, slide motor lowered S9 ... limit switch LS5 detected? S10 ... slide motor stopped, lift cylinder 4 elongation S11 ... container lowering completed S12 ... Whether or not the "loading" push button has been pressed S13 ... is the limit switch LS5 detected? S14 ... lift cylinder 4 contracted S15 ... is the limit switch LS4 detected? S16 ... lift cylinder 4 stopped, slide motor raised S17 ... Limit switch Is S3 detected? S18 ... Slide motor stopped, lift cylinder 4 contracted S19 ... Limit switch LS2 detected? S20 ... Lift cylinder 4 stopped, slide motor raised S21 ... Limit switch LS1 detected? S22 ... Run Allowable lamp lighting S23 ... Container loading completed FIG. 1 (A) shows a state in which a body 47 on which a cargo such as a transported vehicle is previously loaded is already loaded on the freight car 1. First, the body 47 is unloaded. The operation will be described. When the main switch for loading / unloading the body 47 arranged in the driver's seat is turned ON, the control flow from step S1 is started. The driver's seat is provided with two types of push-buttons “lowering” and “loading” of the body 47 adjacent to the main switch, and it is determined which push button is pressed in steps S2 and S12. Determine with. When the “lowering” push button is pressed, after confirming that the lift frame 2 is in the retracted state in step S3, the endless chain 11 is driven by the slide motor 9A in the direction to retract the slide hook, and the body 47 Is slid by the slide hook toward the rear end of the lift frame 2. At this time, the lift cylinder 4 remains stopped and the lift frame 2 maintains a horizontal state. Whether or not the lift frame 2 is horizontal is determined by a signal from a limit switch LS2 disposed between the vehicle body frame 3 and the lift frame 2.
[0012]
With the horizontal movement of the body 47, the backward movement of the body 47 is temporarily stopped when the center of gravity C exceeds the guide roller 6 (FIG. 1B), and then the lift cylinder 4 is extended to lift the lift frame 2 upward. Rotate. Strictly speaking, whether or not the center of gravity C has moved beyond the guide roller 6 can be determined only by measuring the actual center of gravity position that differs for each cargo. However, in this embodiment, the center of gravity C is the type of cargo, etc. for simplicity. Regardless of whether the body 47 is in the center in the front-rear direction, it is uniformly detected by a limit switch LS3 as a sensor for detecting a predetermined slide position of the body 47. In this way, the body 47 is first slid backward in the horizontal direction until the center of gravity C exceeds the guide roller 6, whereby the weight of the left lift frame 2 and the right side of FIG. The weight of the cargo including the body 2 is almost balanced, which makes it possible to drive the lift cylinder 4 with a lower load than before. The arm 5 can be employed.
[0013]
When the lift frame 2 rotates upward and the lift angle of the lift frame 2 reaches a predetermined size, the lift cylinder 4 is temporarily stopped (FIG. 1C), and then the endless chain 11 is re-driven. The body 47 is further moved backward (FIGS. 1D and 1E). As a result, the grounding roller 52 at the rear end of the body 47 contacts the ground G, and the body 47 is supported by both the lift frame 2 and the ground G. Whether or not the lift frame 2 has reached a predetermined lift angle is detected by a limit switch LS4 disposed between the lift frame 2 and the swing arm 5.
[0014]
As shown in FIG. 1E, when the body 47 is moved backward to the end, the driving of the endless chain 11 is stopped, and then the lift cylinder 4 is extended again to tilt the lift frame 2 to the maximum lift angle (FIG. 1). 1 (F)). Whether the body 47 has moved to the end is detected by a limit switch LS5 provided at the rear end of the lift frame 2. When the lift frame 2 is tilted to the maximum lift angle, the body 47 is separated from the slide hook of the lift frame 2. When the separation of the body 47 is completed, the lift frame 2 is returned to the horizontal state as before.
[0015]
When loading the body 47, the process of FIG. 1 (F) to FIG. 1 (A) is performed in order contrary to the above-described lowering operation by pressing the “loading” push button on the driver's seat. Just go. That is, the lorry 1 without the body 47 is moved backward toward the front end of the body 47 placed horizontally on the ground, and when it reaches a predetermined position, the endless chain 11 is driven by the slide motor 9A to move the slide hook to the end. The lift frame 2 is lifted to the maximum angle. Thus, the slide hook is engaged with the body 47, and thereafter, the operations from FIG. 1 (F) to FIG. 1 (A) are executed in order.
[0016]
Referring again to the flow of FIG. 3, when the “load” push button is pressed in step S12, whether or not the slide hook is first moved to the end position in step S13 is determined by the limit switch LS5. It is discriminated by the signal from When it is confirmed that the movement of the slide hook to the end position is completed (FIG. 1 (F)), the lift cylinder 4 starts the shortening operation in step S14 and returns to the predetermined lift angle in step S15. Is confirmed by a signal from the limit switch LS4 (FIG. 1E), the lift cylinder 4 is temporarily stopped in step S16, and the endless chain 11 is driven by the slide motor 9A instead. When it is determined in step S17 that the slide hook has advanced to a predetermined position based on a signal from the limit switch LS3 (FIG. 1C), the slide motor 9A is temporarily stopped in step S18, and the lift cylinder 4 is replaced again. Start shortening operation. The load on the lift cylinder 4 at this time is also reduced because the center of gravity C is close to the guide roller 6. When it is determined in step S19 that the lift frame 2 has become horizontal based on the signal from the limit switch LS2 (FIG. 1B), the lift cylinder 4 is stopped in step S20, and the slide motor 9A is pulled up instead. Driven. If it is determined in step S21 that the slide hook has advanced to the foremost position by pulling up the slide motor 9A based on a signal from the limit switch LS1 disposed at the front end of the lift frame 2 (FIG. 1A). In step S22, the driver's seat runnable lamp is turned on, and the loading operation is completed in step S23.
[0017]
As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, in the above-described embodiment, the center of gravity C is located at a position near the rear of the guide roller 6. The lift cylinder 4 is driven when it reaches the center of gravity, but the center of gravity C does not necessarily have to be near the rear of the guide roller 6. If the position is closer to the guide roller 6 than before, for example, the guide roller 6 The load on the lift cylinder 4 can be reduced by the amount close to the guide roller 6. In the above-described embodiment, the case where the lift frame 2 is slidably supported by the guide roller 6 has been described. However, the present invention is applicable even when the rear end position of the lift frame 2 is rotatably supported by the hinge means. Is applicable. Further, the present invention can be applied regardless of whether the body 47 is separable from the lift frame 2 or not.
[0018]
【The invention's effect】
In the present invention, as described above, since the lift frame is driven up and down while the center of gravity of the cargo including the body is close to the fulcrum member of the lift frame, the load on the lifting means can be reduced, and the lifting means can be reduced with low output and low cost. Can be adopted.
[Brief description of the drawings]
FIGS. 1A to 1F are side views of a loading / unloading process of a truck.
FIG. 2A is a plan view of a lift frame, and FIG. 2B is a side view of the lift frame.
FIG. 3 is a flowchart of a body loading / unloading process.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lorry car 2 Lift frame 3 Body frame 4 Lift cylinder 5 Swing arm 6 Guide roller 11 Endless chain 47 Body

Claims (2)

A lift frame whose front end side is supported by a lifting means disposed between the vehicle body frame and being lifted up and down, and a rear frame side is supported by a fulcrum member disposed on the vehicle body frame, along the lift frame An engagement member disposed so as to be capable of reciprocating in the front-rear direction, a cargo mounting body that is pulled by the engagement member and can ride on the lift frame, and a center of gravity position of the cargo including the body is the fulcrum member A freight vehicle comprising: a sensor for detecting that a predetermined position close to the vehicle is reached; and a control means for driving the lifting means based on a signal from the sensor. A lift frame whose front end side is supported by a lifting means disposed between the vehicle body frame and being lifted up and down, and a rear frame side is supported by a fulcrum member disposed on the vehicle body frame, along the lift frame An engagement member disposed so as to be capable of reciprocating in the front-rear direction, a cargo mounting body that is pulled by the engagement member and can ride on the lift frame, and a center of gravity position of the cargo including the body is the fulcrum member A cargo vehicle comprising: a sensor for detecting that the position of the vehicle has been exceeded; and a control means for driving the lifting means based on a signal from the sensor.

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