JP7229038B2 - Loading table lifting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a loading platform lifting device mounted on a vehicle such as a truck equipped with a loading platform and used for loading and unloading cargo between the ground and the loading platform.

For example, as disclosed in Patent Document 1, the load-receiving platform lifting device described above has a position between a standing posture with respect to the loading platform floor and a sideways lying posture lying at the same height as the loading platform floor. A rotatable load-receiving platform, a rotation position detecting means (sensor) for detecting the attitude (position) of the load-receiving platform, and rotation of the load-receiving platform according to the detection result of the attitude of the load-receiving platform by the rotation position detecting means. According to such a load-receiving table lifting device, by switching the rotation speed of the load-receiving table according to the attitude of the load-receiving table, various environments and conditions can be controlled. can be handled appropriately.

Patent No. 5505954

By the way, in the conventional load-receiving table lifting device, for example, there are cases where an erroneous signal is transmitted from the sensor due to a sensor failure or the like, or no signal is transmitted from the sensor. The situation may differ from the reception state corresponding to the actual posture of the receiving tray, or may be a reception state that cannot actually occur.

Therefore, in the conventional load receiving table lifting device, the operation of the load receiving table may not be controlled correctly, and in the event of an abnormality, there is a danger that the load may collapse during the loading and unloading work, or the loading and unloading work may be interrupted. I had to.

SUMMARY OF THE INVENTION Therefore, in view of such circumstances, it is an object of the present invention to provide a loading platform lifting device that can safely load and unload cargo even when an abnormality occurs in detecting the posture of the loading platform. and

The loading platform lifting device of the present invention is
a loading platform for receiving loads to be loaded and unloaded from the loading platform of the vehicle;
a lifting drive unit that lifts and lowers the load receiving platform with respect to the loading platform;
a rotary drive unit that changes the attitude of the load receiving tray by rotating the load receiving tray;
and a control means for controlling the rotation speed of the load-receiving table according to the attitude of the load-receiving table,
The load-receiving table is capable of changing its posture by the rotation between an upright standing posture and an unfolded posture unfolded to the end of rotation,
The control means includes detection output means for detecting the attitude of the load receiving tray and outputting a signal corresponding to the attitude, and rotational speed of the load receiving tray according to the reception status of the signal output from the detection output means. and a speed setting means for setting
The detection output means outputs a first signal when detecting that the load receiving platform is in a first posture within a range up to an intermediate deployment side posture rotated upward from the position in the deployment posture, and outputs the load receiving device. configured to output a second signal when the platform is in a second posture within a range from the intermediate standing posture rotated upward from the position of the intermediate deployment side posture to the standing posture;
The speed setting means sets a reference speed as the rotation speed of the load receiving tray when only the second signal is received, and sets the rotation speed of the load receiving tray when only the first signal is received. A safe speed slower than the reference speed is set, and in an abnormal state in which both the first signal and the second signal are received, the rotation speed of the load receiving platform is set to the safe speed. ing.

In the load receiving tray lifting device of the above configuration, only the first signal or the second signal is output from the detection output means in the normal state. and the second signal, there is a possibility that the rotation speed is set to a speed that is not suitable for the posture of the load receiving tray.

However, the speed setting means of the load-receiving table lifting device configured as described above sets the rotation speed of the load-receiving table to a safe speed regardless of the actual posture of the load-receiving table in the abnormal state. The loading platform can be rotated at speeds within the safe working range.

In addition, another loading platform lifting device of the present invention is
a loading platform for receiving loads to be loaded and unloaded from the loading platform of the vehicle;
a lifting drive unit that lifts and lowers the load receiving platform with respect to the loading platform;
a rotary drive unit that changes the attitude of the load receiving tray by rotating the load receiving tray;
and a control means for controlling the rotation speed of the load-receiving table according to the attitude of the load-receiving table,
The load-receiving table is capable of changing its posture by the rotation between an upright standing posture and an unfolded posture unfolded to the end of rotation,
The control means includes detection output means for detecting the attitude of the load receiving tray and outputting a signal corresponding to the attitude, and rotational speed of the load receiving tray according to the reception status of the signal output from the detection output means. and a speed setting means for setting
The detection output means outputs a first signal when detecting that the load receiving platform is in a first posture within a range from the deployed posture to an intermediate standing posture rotated upward from the deployed posture. and when it is detected that it is in the second posture within the range between the deployed posture and the intermediate standing posture and the standing posture, the configured to output two signals,
The speed setting means sets a reference speed as the rotation speed of the load receiving tray when only the second signal is received, and sets the rotation speed of the load receiving tray when at least the first signal is received. A safe speed slower than the reference speed is set, and in an abnormal state in which neither the first signal nor the second signal is received, the rotation speed of the load receiving table is set to the safe speed. ing.

In the load-receiving tray lifting device having the above configuration, at least one of the first signal and the second signal is output from the detection output means in a normal state. is in an abnormal state in which neither the first signal nor the second signal is received, there is a possibility that the rotation speed is set to a speed that is not suitable for the posture of the load receiving tray.

However, when neither the first signal nor the second signal is received, the speed setting means of the load-receiving table lifting/lowering device configured as described above can safely set the rotational speed of the load-receiving table regardless of the actual posture of the load-receiving table. Since the speed is set, even in the event of an abnormality, the load receiving table can be rotated at a speed within a range where the worker can work safely.

In the loading platform lifting device of the present invention,
The detection output means is
a first detection unit that detects that the load receiving tray is in the first posture and outputs the first signal;
a second detection unit that detects that the load receiving tray is in the second posture and outputs the second signal;
The speed setting means rotates the load receiving tray in an abnormal state in which neither the first signal output from the first detection section nor the second signal output from the second detection section is received. The speed may be set to the safe speed.

According to the load receiving tray lifting device configured as described above, when neither the first signal output from the first detection section nor the second signal output from the second detection section is received, the rotation of the load receiving tray Although there is a possibility that the speed is set to an incorrect speed, in this case, the speed setting means sets the rotation speed of the load receiving table to a safe speed, so that the worker can work safely even in the event of an abnormality. Can rotate the loading platform at speeds within range.

The loading platform lifting device of the present invention is
A rotation operation means operated by a user to rotate the load receiving tray,
The rotating operation means is
a tilting operation unit that outputs a tilting control signal for rotating the load receiving table in a tilting direction;
a raising operation unit for outputting a raising control signal for rotating the load receiving tray in a raising direction;
The speed setting means is
In a state in which the inversion control signal or the inversion control signal is received and in a state in which the abnormal state is recognized, a predetermined suppression time has elapsed from the point in time when the inversion control signal is received as a reference. At this time, the rotation speed of the load receiving table may be set to the reference speed.

According to the above configuration, for example, even if an abnormal state occurs when the lifting operation portion is operated to switch the load receiving tray from the downwardly inclined posture to the standing posture, the load receiving tray can be lifted after the predetermined suppression time elapses. Since it can be rotated at the reference speed, it is possible to shorten the time required to switch the load receiving tray to the upright posture.

in this case,
The load-receiving table is configured to tilt upward from the horizontal when in the intermediate deployment side posture,
The restraint time may correspond to the time required for the load receiving tray to switch from the deployed posture to the intermediate deployed posture.

In this way, for example, even if an abnormal state occurs when the lifting operation part is operated to switch the load receiving tray from the unfolded posture to the standing posture, in a state where there is a possibility that a load is placed on the loading tray, The load-receiving table can be rotated at a safe speed, and when the load-receiving table is switched to a state in which no load is placed on it, the load-receiving table can be rotated at a reference speed, thereby shortening the time until the load-receiving table is switched to the upright posture. .

ADVANTAGE OF THE INVENTION According to the load-receiving stand lifting device of this invention, even when abnormality arises in the detection of the attitude|position of a load-receiving stand, the outstanding effect that a load can be safely loaded/unloaded can be produced.

1 is a side view of a load receiving platform lifting device according to an embodiment of the present invention; FIG. It is a partially enlarged side view of the load receiving platform lifting device according to the same embodiment. It is an assembly drawing showing the connection structure of the load-receiving board raising/lowering apparatus which concerns on the same embodiment. It is a block diagram of the loading platform lifting device according to the same embodiment. It is an explanatory view of the operation of the load receiving table lifting device according to the same embodiment. It is operation explanatory drawing of the load-receiving board raising/lowering apparatus which concerns on other embodiment of this invention. It is operation explanatory drawing of the load-receiving board raising/lowering apparatus which concerns on another embodiment of this invention. It is operation explanatory drawing of the load-receiving board raising/lowering apparatus which concerns on further another embodiment of this invention.

Hereinafter, a load receiving platform lifting device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The loading platform lifting device according to the present embodiment is mounted on a vehicle such as a truck equipped with a loading platform, and configured to load and unload cargo between the ground and the loading platform.

As shown in FIG. 1, the vehicle 7 has a pair of chassis frames 70 that extend in the front-rear direction of the vehicle 7 and are installed on both sides in the vehicle width direction of the vehicle 7, and are fixed on the chassis frames 70. A subframe 71 is provided, and a loading platform 72 is mounted on the subframe 71 .

The load receiving platform lifting device 1 includes a load receiving platform 2 provided on a loading platform 72 for accommodating luggage, a connection structure 3 for connecting the loading platform 2 to a vehicle 7, and an elevation drive unit 4 for raising and lowering the loading platform 2 with respect to the loading platform. a rotary drive unit 5 capable of switching the posture of the load receiving tray 2 between an upright posture and an extended posture rotated to the end of the rotation range by rotating the load receiving tray 2 with respect to the luggage compartment; and control means 6 (see FIG. 4) for controlling the rotation speed of the load receiving tray 2 according to the attitude of the load receiving tray 2. As shown in FIG.

The load-receiving table 2 has a rectangular plate-shaped load placement portion 20 and a stiffener 21 provided on the load placement portion 20 .

The luggage placement section 20 is arranged behind the loading platform 72 . The luggage placement section 20 is configured to include a placement surface 200 for placing a luggage and a back surface 201 opposite to the placement surface 200 .

As described above, since the luggage placement section 20 has a rectangular plate shape, one plate surface serves as the placement surface 200 and the other plate surface serves as the back surface 201 .

In the state where the load receiving tray 2 is switched to the standing posture, the mounting surface 200 is arranged facing the loading platform 72 side, and the back surface 201 is arranged facing the opposite side of the loading platform 72 side. Further, when the load receiving tray 2 is switched to the unfolded posture, the mounting surface 200 is arranged facing upward, and the back surface 201 is arranged facing downward.

In addition, the luggage placement portion 20 has an edge (hereinafter referred to as a base edge) arranged on the rotation starting side and an edge (hereinafter referred to as a tip edge) extending parallel to the base edge. ) and are included. In the present embodiment, a pair of edges connecting the base edge and the tip edge and extending parallel to each other will be referred to as side edges in the following description.

The stiffener 21 is provided on the rear surface 201 of the luggage placement section 20 . In addition, the stiffener 21 extends straight from the base end side to the tip side of the luggage placement section 20, and the vertical width (that is, the extension from the back surface 201) increases from the base end side to the tip side. (extension amount) is formed to gradually decrease. Therefore, the tip of the stiffener 21 is formed to have an acute angle.

The connecting structure 3 is a parallel link mechanism that moves together with the load-receiving table 2, as indicated by the solid line and the two-dot chain line in FIG. As shown in FIG. 2, the connection structure 3 according to the present embodiment has a fixed side bracket 30 fixed to the vehicle 7 (chassis frame 70), and a long one end (base end) in the longitudinal direction. A first arm 31 that is rotatably connected to the side bracket 30, and one end (base end) in the longitudinal direction that is long and parallel or substantially parallel to the arm is rotatably connected to the fixed side bracket 30. and a movable bracket 33 to which the tip of the first arm 31 and the tip of the second arm 32 are rotatably connected.

As shown in FIG. 3, the movable side bracket 33 is rotatably connected to a load receiving plate (load placement portion 20). Therefore, the load receiving plate (load placing portion 20) is rotatable starting from the connection position with the movable side bracket 33. As shown in FIG.

The lifting drive unit 4 is configured to lift and lower the load receiving table 2 by driving the connection structure 3 .

As shown in FIG. 2, the elevation drive unit 4 according to the present embodiment includes a tilt link 40 rotatably connected to the fixed side bracket 30, and a first arm 31 rotatably connected to the tilt link 40. and an elevating cylinder 41 arranged below.

A proximal end of a first arm 31 is rotatably connected to the tilt link 40 , and a distal end of an elevating cylinder 41 is rotatably connected to a distal end of the first arm 31 .

Therefore, when the elevating cylinder 41 is contracted, the movable bracket 33 is pulled downward, and the load receiving table 2 is lowered accordingly. On the other hand, when the elevating cylinder 41 is extended, the movable bracket 33 is pushed upward, and the load receiving table 2 is lifted accordingly. Moreover, the load receiving platform 2 is configured to move up and down between a position where it is grounded on the ground by the lifting drive unit 4 and a position corresponding to the floor surface of the loading platform 72 .

In addition, although not shown, the elevation drive unit 4 is configured to have elevation operation means for extending and retracting the elevation cylinder 41 (that is, for raising and lowering the load receiving table 2).

The lifting operation means can have, for example, a lowering operation section for outputting a lowering control signal for lowering the load receiving tray 2 and an ascending operation section for outputting an ascending control signal for raising the load receiving tray 2. When the operation part is operated, the lifting cylinder 41 is contracted to lower the load receiving table 2, and when the lifting operation part is operated, the lifting cylinder 41 is extended to lift the load receiving table 2.例文帳に追加can be done.

The rotary drive unit 5 rotates a rotary cylinder (so-called tilt cylinder) 50 , one end of which is rotatably connected to the movable bracket 33 and the other end of which is rotatably connected to the stiffener 21 , and the load receiving table 2 . and an operation means (hereinafter referred to as rotation operation means) 51 (see FIG. 4) operated by the user.

Since the other end of the rotating cylinder 50 is rotatably connected to the rear surface 201 of the load placing portion 20, when the rotating cylinder 50 is extended, the rear surface 201 of the load placing portion 20 is pushed up, thereby 20 rotates in the upright direction, and when the rotating cylinder 50 contracts, the rear surface 201 of the luggage placement section 20 is pulled toward the movable side bracket 33 and rotates in the direction of falling sideways.

With this rotation, the load-receiving platform 2 is in a standing posture, a deployed posture, and a state in which it is raised above the deployed posture (more specifically, between the standing posture and the deployed posture and at the time of the deployed posture). and a state in which it is above the placement position in the intermediate deployment side posture and below the placement position in the standing posture (i.e., intermediate deployment side). It is possible to change the posture to an intermediate standing side posture (position between the placement position in the side posture and the placement position in the standing posture).

When the cargo receiving platform 2 of the present embodiment is switched to the deployed posture, the posture is inclined downward so that the tip end side is located below the base end side. It becomes a posture that is laid down at the same height position as.

In addition, when the cargo receiving tray 2 is switched to the intermediate standing side posture, it assumes a posture inclined so that the tip side is positioned above the base end side.

The rotation operating means 51 has a tilting operation portion 510 that outputs a tilting control signal for rotating the load receiving tray 2 in the tilting direction, and a raising operating portion 511 for outputting a lifting control signal for rotating the load receiving tray 2 in the lifting direction ( See Figure 4).

In the present embodiment, when the tilting operation portion 510 is operated, the rotating cylinder 50 is contracted to rotate the load receiving table 2 in a tilted direction, and when the raising operation portion 511 is operated, the rotating cylinder 50 extends. As a result, the load receiving tray 2 rotates in the direction in which it is raised. For example, the folding operation portion 510 and the raising operation portion 511 may be configured by one switch, or may be configured by two switches such as an open/close switch and an upper switch or an open/close switch and a lower switch. may

The control means 6, as shown in FIG. and a speed setting means 61 for setting the rotation speed of the load receiving table 2 according to the speed.

As shown in FIG. 5, the detection output means 60 outputs a first signal when it detects that the load receiving tray 2 is in the first posture within the range from the intermediate deployment side posture to the deployment posture, and the load receiving tray 2 is in the intermediate position. It is configured to output the second signal when the second posture is within the range from the standing side posture to the standing posture. In addition, in FIG. 5, the receiving tray 2 is in the second posture.

As shown in FIG. 4, the detection output means 60 according to this embodiment includes two detection units for detecting the posture of the load receiving tray 2. More specifically, when the load receiving tray 2 is in the first attitude and a second detector 601 that detects that the load receiving tray 2 is in the second posture and outputs a second signal.

Since the angle of the load receiving tray 2 in the intermediate deployment side posture is set to 0 degrees and the angle of the load receiving tray 2 in the intermediate standing side posture is set to 5 degrees, the first detection unit 600 detects that the angle of the load receiving tray 2 is 0 degrees. The second detection unit 601 is configured to output a first signal when the angle is less than or equal to 5 degrees, and to output a second signal when the angle of the load receiving table 2 is 5 degrees or more. Therefore, when the angle of the load receiving tray 2 is less than 5 degrees and is in the third posture greater than 0 degrees, the detection output means 60 is configured to output neither the first signal nor the second signal. The angle of the load receiving platform 2 is the inclination of the load receiving platform 2 when the ground is used as a reference.

The speed setting means 61 performs an abnormality determination process for determining that the receiving tray 2 is in an abnormal state (hereinafter referred to as an abnormal state) by the detection output means 60, and the processing result of the abnormality determining process. and a speed setting process for setting the second rotational speed.

The speed setting means 61 can receive the first signal output from the first detection section 600 and the second signal output from the second detection section 601. In the abnormality determination process, the speed setting means 61 receives the first signal. Then, when the second signal is received, it is determined that the load receiving tray 2 is in an abnormal state.

In the speed setting process, when the speed setting means 61 receives only the second signal, the reference speed is set as the rotational speed of the receiving tray 2, and when only the first signal is received, the speed setting means 61 sets the reference speed. Set the rotational speed of the motor to a safe speed that is lower than the reference speed.

When the angle of the load receiving tray 2 is less than 5 degrees and greater than 0 degrees, neither the first signal nor the second signal is output from the detection output means 60. In this case, in the speed setting process, the load receiving tray 2 is set to the safe speed.

Furthermore, in the speed setting process, when the speed setting means 61 is receiving the first signal and the second signal, that is, when the abnormality determination process determines that the receiving tray 2 is in an abnormal state, 2, the rotation speed of the load receiving table 2 is set to a safe speed.

In this manner, the speed setting means 61 is configured to set the rotation speed of the load receiving tray 2 to a safe speed when the load receiving tray 2 is in an abnormal state, that is, when the posture of the load receiving tray 2 cannot be grasped. .

The configuration of the load receiving table lifting device 1 according to the present embodiment is as described above. Next, the operation of the load receiving platform lifting device 1 will be described.

First, the normal operation of the load receiving platform lifting device 1 will be described. When the load-receiving platform 2 is switched from the standing posture to the deployed posture, the load-receiving platform 2 starts to rotate at a reference speed, and when the tilt of the load-receiving platform 2 switches to 0 degrees (the intermediate deployment side posture in this embodiment), it touches the ground. until (in this embodiment, until it switches to the deployed posture) at a safe speed.

On the other hand, when the load receiving platform 2 is in contact with the ground and rotates upward (upright posture side), it starts to rotate at a safe speed, and when the load receiving platform 2 is tilted upward by 5 degrees from the horizontal (this In the embodiment, when it switches to the intermediate standing position, it rotates at the reference speed until it reaches the standing position.

In addition, when the load receiving table 2 is rotated upward or downward from a state in which the load receiving table 2 is tilted by 5 degrees or less (in this embodiment, the state is tilted downward from the intermediate standing side posture), the load receiving table 2 is safe. Start spinning at speed.

Then, when the load receiving table 2 is rotated upward or downward from a state in which the inclination of the load receiving table 2 is greater than 5 degrees (in this embodiment, the state is tilted upward from the intermediate upright posture), the load receiving table 2 is: Start rotating at standard speed.

The load-receiving platform lifting device 1 operates when the load-receiving platform 2 is switched to the first posture and the speed setting means 61 receives only the first signal, or when the load-receiving platform 2 is switched to the second posture and When the speed setting means 61 receives only the second signal, the receiving tray 2 is normal. Therefore, the load receiving tray 2 rotates at a safe speed in the first posture, and rotates at the reference speed in the second posture.

If the angle of the load-bearing platform 2 is less than 5 degrees and greater than 0 degrees and neither the first nor the second signal is received, the load-bearing platform 2 rotates at a safe speed.

When the speed setting means 61 receives the first signal and the second signal, the abnormality determination process determines that the receiving tray 2 is in an abnormal state. Rotate at a safe speed.

As described above, in the load receiving platform lifting device 1 of the present embodiment, only the first signal or the second signal is output from the detection output means 60 in the normal state. Therefore, when the speed setting means 61 receives the first signal and the second signal and becomes abnormal, there is a possibility that the rotation speed is set to a speed that is not suitable for the posture of the load receiving tray 2 .

However, the speed setting means 61 of the load-receiving platform lifting device 1 sets the rotation speed of the load-receiving platform 2 to a safe speed regardless of the actual posture of the load-receiving platform 2 in the abnormal state. can rotate the load receiving table 2 at a speed within the safe working range, thereby safely loading and unloading cargo even if an abnormality occurs in the detection of the attitude of the load receiving table 2. The excellent effect of being able to

It should be noted that the load-receiving tray lifting device of the present invention is not limited to the above-described embodiment, and of course various modifications can be made without departing from the gist of the present invention.

In the above embodiment, the detection output means 60 is configured to output only the first signal or the second signal during normal operation, but the configuration is not limited to this. As shown in FIG. 6, the detection output means 60 may be configured to output at least one of the first signal and the second signal during normal operation.

The detection output means 60 outputs a first signal when it detects that the load receiving tray 2 is in the first posture within the range from the deployed posture to the intermediate standing posture, and outputs the first signal, and the range from the intermediate deployed posture to the standing posture. It is only necessary to be configured to output the second signal when detecting that the second posture is in the inner position. That is, the first signal and the second signal are output from the detection output means 60 when the load receiving tray 2 is rotating between the intermediate deployment side posture and the intermediate standing side posture. In addition, in FIG. 6, the receiving tray 2 is in the second posture.

In this case, the speed setting means 61 sets the reference speed as the rotational speed of the load receiving tray 2 when only the second signal is received, and sets the rotational speed of the load receiving tray 2 when at least the first signal is received. is set to a safe speed lower than the reference speed, and in an abnormal state in which the first signal and the second signal are not received, the rotation speed of the load receiving table 2 is set to the safe speed.

The detection output means 60 may be configured to output the first signal and the second signal from one detection unit, or may be configured to output the first signal and the second signal from separate detection units. may be configured to

In the above embodiment, the detection output means 60 is configured to output the first signal and the second signal from separate detection units (the first detection unit 600 and the second detection unit 601). is not limited to For example, the detection output means 60 may be configured to output the first signal and the second signal from one detection section.

Although not specifically mentioned in the above embodiment, for example, if the speed setting means 61 is in a state of receiving a fall control signal or a start control signal and is in a state of recognizing an abnormal state, the start control Based on the time when the signal is received, the time required for the load receiving tray 2 to switch from the deployed posture to the intermediate standing posture (that is, the posture in which it is difficult or impossible to load the load beyond the horizontal state of the load receiving tray 2) The rotation speed of the load receiving table 2 may be set to the reference speed when the suppression time corresponding to the time required for switching to ) has elapsed.

The restraint time may be set based on other conditions. It is also possible to set the time required for the posture to switch from the intermediate unfolded posture to the intermediate standing posture.

However, it is preferable that the suppression time is set to the time required for switching from the state in which the load receiving table 2 is tilted at 0 degrees or less to the state in which it is rotated to the standing posture side to such an extent that it does not reach the standing posture side. More specifically, with the ground contact angle of the load receiving table 2 as a reference, the load receiving table 2 is tilted upward at an angle larger than the ground contact angle from a state of 0 degrees (that is, when the load is placed on the load receiving table 2 It is preferable that the required time until the baggage rolls or slides vigorously when it is placed thereon is set as the suppression time.

In this case, the speed setting means 61, for example, as shown in FIG. or when neither is received as shown in FIG. , the rotational speed of the load receiving table 2 may be set to the reference speed.

For example, as shown in FIG. 8, the speed setting means 61 may be set to an abnormal state (either the first signal or the second signal) after receiving the down control signal or the up control signal and before the suppression time elapses. or when neither is received), the rotation speed of the load receiving table 2 at the time when the suppression time has elapsed based on the time when the tilt control signal or the start control signal is received is set as the reference speed.

According to the above configuration, for example, when the raising operation portion 511 is operated to raise the load receiving tray 2 in the intermediate deployment side posture, the load receiving tray 2 can be lifted after waiting for the load receiving tray 2 to tilt even in an abnormal state. is set to the reference speed, for example, even if an abnormal state occurs when the raising operation unit 511 is operated to switch the load receiving tray 2 from the unfolded posture to the standing posture, the load can be placed on the loading tray 2. In a state where there is a possibility that the cargo will be unloaded, the cargo receiving table 2 can be rotated at a safe speed. The time required for switching the platform 2 to the standing posture can be shortened.

In the above-described embodiment, the load receiving tray 2 is configured so as to assume a horizontal posture when in the intermediate deployment side posture, but it is not limited to this configuration. For example, the load-receiving table 2 is tilted downward from the horizontal (posture tilted so that the tip side is located below the base end side) when it is in the middle deployment side posture, or is tilted upward from the horizontal. It may be configured to take a posture (a posture inclined so that the distal side is positioned higher than the proximal side).

In the above-described embodiment, the load receiving tray 2 is configured so that when switched to the deployed posture, the tip end side is positioned below the base end side, so that the posture is inclined downward. not. For example, the load-receiving table 2 may be configured so as to take a horizontal position (a position lying down at the same height as the loading platform 72) when switched to the expanded position.

In this case, when the cargo receiving tray 2 is switched to the intermediate deployment side posture, it assumes an inclined posture so that the tip side is positioned above the base end side, and when switched to the intermediate standing side posture, it assumes the posture of the intermediate deployment side posture. It suffices if the configuration is such that the posture is tilted upward more than the tilt of .

The end of the rotation range of the load receiving table 2 can be adjusted by installing a stopper or adjusting the stroke width of the cylinder.

Although not specifically mentioned in the above embodiment, when the load receiving platform 2 is rotated at a safe speed, for example, if the rotating cylinder 50 is a hydraulic cylinder, a flow to reduce the flow rate in the middle of the oil passage to the rotating cylinder 50 A control valve may be installed, and oil may be supplied to the rotating cylinder 50 through this flow control valve. When rotating the load receiving table 2 at the reference speed, the oil may be supplied to the rotating cylinder 50 without passing through the flow control valve.

When the rotary cylinder 50 is a hydraulic cylinder, the number of revolutions of the motor that drives the pump that supplies the oil to the rotary cylinder 50 is reduced, that is, the amount of oil discharged from the pump is reduced. The amount of oil supplied to the load receiving platform 2 may be reduced so that the load receiving platform 2 rotates at a safe speed.

Furthermore, when the rotary cylinder 50 is an electric cylinder, the load receiving tray 2 may be rotated at a safe speed by lowering the rotation speed of the motor that drives the rotary cylinder 50 . In this case, for example, an opening/closing switch may be provided in the electric path to the rotating cylinder 50, and the number of rotations of the motor may be decreased by continuing the switch to decrease the current value.

DESCRIPTION OF SYMBOLS 1... Load-receiving stand lifting device, 2... Load-receiving stand, 3... Connection structure, 4... Elevation drive part, 5... Rotation drive part, 6... Control means, 7... Vehicle, 20... Baggage placement part, 21... Stiffener, 30 ... Fixed side bracket 31 ... First arm 32 ... Second arm 33 ... Movable side bracket 40 ... Tilt link 41 ... Elevating cylinder 50 ... Rotating cylinder 51 ... Rotation operation means 60 ... Detection output means 61 Speed setting means 70 Chassis frame 71 Sub-frame 72 Loading platform 200 Mounting surface 201 Rear surface 510 Folding operation unit 511 Raising operation unit 600 First detection unit 601 …Second detector

Claims (7)

a loading platform for receiving loads to be loaded and unloaded from the loading platform of the vehicle;
a lifting drive unit that lifts and lowers the load receiving platform with respect to the loading platform;
a rotary drive unit that changes the attitude of the load receiving tray by rotating the load receiving tray;
and a control means for controlling the rotation speed of the load-receiving table according to the attitude of the load-receiving table,
The load-receiving table is capable of changing its posture by the rotation between an upright standing posture and an unfolded posture unfolded to the end of rotation,
The control means includes detection output means for detecting the attitude of the load receiving tray and outputting a signal corresponding to the attitude, and rotational speed of the load receiving tray according to the reception status of the signal output from the detection output means. and a speed setting means for setting
The detection output means outputs a first signal when detecting that the load receiving platform is in a first posture within a range up to an intermediate deployment side posture rotated upward from the position in the deployment posture, and outputs the load receiving device. configured to output a second signal when the platform is in a second posture within a range from the intermediate standing posture rotated upward from the position of the intermediate deployment side posture to the standing posture;
The speed setting means sets a reference speed as the rotation speed of the load receiving tray when only the second signal is received, and sets the rotation speed of the load receiving tray when only the first signal is received. A safe speed slower than the reference speed is set, and in an abnormal state in which both the first signal and the second signal are received, the rotation speed of the load receiving platform is set to the safe speed. Ru
Loading table lifting device. a loading platform for receiving loads to be loaded and unloaded from the loading platform of the vehicle;
a lifting drive unit that lifts and lowers the load receiving platform with respect to the loading platform;
a rotary drive unit that changes the attitude of the load receiving tray by rotating the load receiving tray;
and a control means for controlling the rotation speed of the load-receiving table according to the attitude of the load-receiving table,
The load-receiving table is capable of changing its posture by the rotation between an upright standing posture and an unfolded posture unfolded to the end of rotation,
The control means includes detection output means for detecting the attitude of the load receiving tray and outputting a signal corresponding to the attitude, and rotational speed of the load receiving tray according to the reception status of the signal output from the detection output means. and a speed setting means for setting
The detection output means outputs a first signal when detecting that the load receiving platform is in a first posture within a range from the deployed posture to an intermediate standing posture rotated upward from the deployed posture. outputting, and detecting that it is in a second posture within a range between the intermediate deployed posture and the standing posture positioned between the position of the deployed posture and the position of the intermediate standing posture, configured to output a second signal;
The speed setting means sets a reference speed as the rotation speed of the load receiving tray when only the second signal is received, and sets the rotation speed of the load receiving tray when at least the first signal is received. A safe speed lower than the reference speed is set, and in an abnormal state in which neither the first signal nor the second signal is received, the rotation speed of the load receiving table is set to the safe speed. Ru
Loading table lifting device. The detection output means is
a first detection unit that detects that the load receiving tray is in the first posture and outputs the first signal;
a second detection unit that detects that the load receiving tray is in the second posture and outputs the second signal;
The speed setting means adjusts the rotation speed of the load receiving table in a state in which neither the first signal output from the first detection unit nor the second signal output from the second detection unit is received . configured to set to said safe speed;
The load receiving table lifting device according to claim 1 . The detection output means is
a first detection unit that detects that the load receiving tray is in the first posture and outputs the first signal; and a first detection unit that detects that the load receiving tray is in the second posture and outputs the second signal. configured to have a second detection unit,
The load receiving table lifting device according to claim 2. A rotation operation means operated by a user to rotate the load receiving tray,
The rotating operation means is
a tilting operation unit that outputs a tilting control signal for rotating the load receiving table in a tilting direction;
a raising operation unit for outputting a raising control signal for rotating the load receiving tray in a raising direction;
The speed setting means is
In a state in which the inversion control signal or the inversion control signal is received and in a state in which the abnormal state is recognized, a predetermined suppression time has elapsed from the point in time when the inversion control signal is received as a reference. configured to set the rotational speed of the loading platform to the reference speed at a point in time;
The load receiving table lifting device according to any one of claims 1 , 2, and 4 . A rotation operation means operated by a user to rotate the load receiving tray,
The rotating operation means is
a tilting operation unit that outputs a tilting control signal for rotating the load receiving table in a tilting direction;
a raising operation unit for outputting a raising control signal for rotating the load receiving tray in a raising direction;
The speed setting means is
If the start control signal or the start control signal has been received and the start control signal has not been received, the load reception is performed when a predetermined suppression time has elapsed based on the time when the start control signal is received. configured to set the rotation speed of the platform to the reference speed;
The loading platform lifting device according to claim 3. The load-receiving table is configured to tilt upward from the horizontal when in the intermediate deployment side posture,
The suppression time is a time corresponding to the time required for the load receiving platform to switch from the deployed posture to the intermediate deployed posture.
The loading platform lifting device according to claim 5 or 6 .

Images