JP2020131780A - Cargo reception base lifting device - Google Patents

Abstract

To provide a cargo reception base lifting device which can safely perform loading and unloading of a cargo even if abnormality occurs in detection of a cargo reception base attitude.SOLUTION: A cargo reception base lifting device 1 comprises: a cargo reception base 2 which receives a cargo loaded and unloaded on a load-carrying platform 72 of a vehicle 7; a lifting drive part 4 which lifts the cargo reception base 2 with respect to the load-carrying platform 72; a rotating drive part 5 which rotates the cargo reception base 2, and changes an attitude of the cargo reception base 2; and control means 6 which controls a rotational speed of the cargo reception base 2 according to the attitude of the load reception base 2. The control means 6 has detection output means 60 which detects the attitude of the cargo reception base 2, and then, outputs a signal according to the attitude, and speed setting means 61 which sets the rotational speed of the cargo reception base 2 according to reception state of the signal outputted from the detection output means 60, and when the reception state of the signal in the speed setting means 61 is not suitable for the attitude of the cargo reception base 2, sets the rotational speed of the cargo reception base 2 to a safe speed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a loading platform lifting device that is mounted on a vehicle such as a freight vehicle provided with a loading platform and is used for loading and unloading luggage between the ground and the loading platform.

The above-mentioned loading platform elevating device includes, for example, between an upright posture with respect to the loading platform and a sideways posture in which the loading platform is laid down at the same height as the loading platform, as disclosed in Patent Document 1. Rotation of the cradle according to the rotation of the cradle, the rotation position detecting means (sensor) for detecting the posture (position) of the cradle, and the result of detecting the posture of the cradle by the rotating position detecting means. Those equipped with a control means for controlling the speed are known, and according to such a cradle elevating device, various environments and conditions can be obtained by switching the rotation speed of the cradle according to the posture of the cradle. It is said that it can be dealt with appropriately.

Patent No. 5505954

By the way, in the conventional cargo receiving platform elevating device, for example, an erroneous signal may be transmitted from the sensor due to a failure of the sensor, or the signal may not be transmitted from the sensor, and the control means receives the signal. The situation may be different from the reception state corresponding to the actual posture of the consignment cradle, or the reception state may be a reception state that cannot actually occur.

Therefore, in the conventional load receiving platform lifting device, the operation of the loading platform may not be controlled correctly, and in the event of an abnormality, there is a risk of load collapse during the loading / unloading operation of the load, or the loading / unloading operation may be interrupted. There was no choice but to do it.

Therefore, in view of such circumstances, it is an object of the present invention to provide a loading platform elevating device capable of safely loading and unloading luggage even when an abnormality occurs in the detection of the posture of the loading platform. And.

The loading platform elevating device of the present invention
A loading platform that receives luggage to be loaded and unloaded on the loading platform of the vehicle,
An elevating drive unit that raises and lowers the loading platform with respect to the loading platform,
A rotary drive unit that changes the posture of the cradle by rotating the cradle, and
A control means for controlling the rotation speed of the cradle according to the posture of the cradle is provided.
The cradle can change its posture between an upright posture and a unfolded posture extended to the rotating end by the rotation.
The control means is a detection output means that detects the posture of the consignment and outputs a signal according to the posture, and a rotation speed of the consignment according to the reception status of the signal output from the detection output means. Has a speed setting means to set
When the detection output means detects that the load receiving table is in the first posture within the range up to the intermediate deployment side posture rotated upward from the position in the deployment posture, the detection output means outputs a first signal and receives the load. It is configured to output a second signal when the table is in the second posture within the range from the intermediate standing posture rotated upward from the position in the intermediate deployment side posture to the standing posture.
The speed setting means sets a reference speed as the rotation speed of the cradle in a state where only the second signal is received, and sets the rotation speed of the cradle in a state where only the first signal is received. It is configured to set a safe speed slower than the reference speed and set the rotation speed of the consignment to the safe speed in an abnormal state in which both the first signal and the second signal are received. ing.

In the load receiving platform elevating device having the above configuration, in the normal state, only the first signal or the second signal is output from the detection output means, but the speed setting means is the first signal due to a failure of the detection output means or the like. In the abnormal state of receiving the second signal and the second signal, there is a possibility that the rotation speed is set to a speed unsuitable for the posture of the cradle.

However, the speed setting means of the load receiving platform elevating device having the above configuration 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, so that the operator can perform even in the abnormal state. The cradle can be rotated at a speed within the safe working range.

Further, another load receiving platform elevating device of the present invention is
A loading platform that receives luggage to be loaded and unloaded on the loading platform of the vehicle,
An elevating drive unit that raises and lowers the loading platform with respect to the loading platform,
A rotary drive unit that changes the posture of the cradle by rotating the cradle, and
A control means for controlling the rotation speed of the cradle according to the posture of the cradle is provided.
The cradle can change its posture between an upright posture and a unfolded posture extended to the rotating end by the rotation.
The control means is a detection output means that detects the posture of the consignment and outputs a signal according to the posture, and a rotation speed of the consignment according to the reception status of the signal output from the detection output means. Has a speed setting means to set
When the detection output means detects that the load receiving table is in the first posture within the range from the unfolded posture to the intermediate standing side posture rotated upward from the position in the unfolded posture, the first signal is output. When it is output and it is detected that it is the second posture within the range from the deployed side posture to the standing posture while it is located between the position in the deployed posture and the position in the intermediate standing side posture, the second posture is obtained. It is configured to output two signals,
The speed setting means sets a reference speed as the rotation speed of the cradle while receiving only the second signal, and sets the rotation speed of the cradle at least while receiving the first signal. It is configured to set the safe speed slower than the reference speed and set the rotation speed of the consignment to the safe speed in an abnormal state in which neither the first signal nor the second signal is received. ing.

In the load receiving platform elevating device having the above configuration, in the normal state, at least one of the first signal and the second signal is output from the detection output means, but the speed setting means may be caused by a failure of the detection output means or the like. 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 unsuitable for the posture of the cradle.

However, the speed setting means of the cradle elevating device having the above configuration can safely control the rotation speed of the cradle regardless of the actual posture of the cradle in a state where neither the first signal nor the second signal is received. Since the speed is set, the cargo bed can be rotated at a speed within a range in which the operator can work safely even in the event of an abnormality.

In the loading platform elevating device of the present invention
The detection output means
A first detection unit that detects that the loading platform is in the first posture and outputs the first signal,
It has a second detection unit that detects that the loading platform is in the second posture and outputs the second signal.
The speed setting means rotates the cradle in an abnormal 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. The speed may be configured to set the safe speed.

According to the cradle elevating device having the above configuration, when neither the first signal output from the first detection unit nor the second signal output from the second detection unit is received, the cradle rotates. There is a possibility that the speed will be set to the wrong speed, but in this case, since the speed setting means sets the rotation speed of the cradle to the safe speed, the operator can work safely even in the event of an abnormality. The cradle can be rotated at a speed within the range.

The loading platform elevating device of the present invention
A rotation operating means operated by the user to rotate the cradle is provided.
The rotation operating means
A tilting operation unit that outputs a tilting control signal that rotates the loading platform in the tilting direction,
It has a start-up operation unit that outputs a start-up control signal that rotates the load receiving table in the direction of raising it.
The speed setting means
In the state of receiving the tilt control signal or the trigger control signal and recognizing the abnormal state, a predetermined suppression time has elapsed with reference to the time when the trigger control signal is received. At the time point, the rotation speed of the consignment cradle may be set to the reference speed.

According to the above configuration, for example, even if an abnormal state occurs when the loading platform is switched from the downward tilting posture to the standing posture by operating the raising operation unit, the loading platform is moved after a predetermined suppression time has elapsed. Since it can be rotated at a reference speed, the time required to switch the loading platform to the upright posture can be shortened.

in this case,
The loading platform is configured to tilt upward from the horizontal when in the intermediate deployment side posture.
The restraint time may be a time corresponding to the time required for the consignment stand to switch from the unfolded posture to the intermediate unfolded posture.

In this way, for example, even if an abnormal state occurs when the loading platform is switched from the deployed posture to the standing posture by operating the raising operation unit, the load may be placed on the loading platform. The cradle can be rotated at a safe speed, and when the cradle is switched to a state in which no luggage is placed, the cradle can be rotated at the reference speed to shorten the time required to switch the cradle to the upright posture. ..

According to the loading platform elevating device of the present invention, even when an abnormality occurs in the detection of the posture of the loading platform, it is possible to achieve an excellent effect that the load can be safely loaded and unloaded.

It is a side view of the loading platform elevating device which concerns on one Embodiment of this invention. It is a partially enlarged side view of the load receiving stand elevating device which concerns on the same embodiment. It is an assembly drawing which showed the connection structure of the load receiving stand elevating device which concerns on the same embodiment. It is a block diagram of the loading platform elevating device which concerns on the same embodiment. It is operation explanatory drawing of the load receiving stand elevating device which concerns on the same embodiment. It is operation | movement explanatory drawing of the load receiving stand elevating device which concerns on other embodiment of this invention. It is operation | movement explanatory drawing of the load receiving stand elevating device which concerns on another Embodiment of this invention. It is operation | movement explanatory drawing of the load receiving stand elevating device which concerns on still another Embodiment of this invention.

Hereinafter, the load receiving platform elevating device according to the embodiment of the present invention will be described with reference to the attached drawings.

The loading platform elevating device according to the present embodiment is mounted on a vehicle such as a freight vehicle provided with a loading platform, and is configured to load and unload luggage between the ground and the loading platform.

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

The loading platform lifting device 1 includes a loading platform 2 provided on a loading platform 72 for accommodating luggage, a connecting structure 3 for connecting the loading platform 2 to the vehicle 7, and an elevating drive unit 4 for raising and lowering the loading platform 2 with respect to the loading platform. By rotating the load receiving table 2 with respect to the luggage compartment, the rotary drive unit 5 can switch between the standing position in which the load receiving table 2 stands up and the deployed posture in which the load receiving table 2 is rotated to the end of the rotation range and tilted down. And a control means 6 (see FIG. 4) for controlling the rotation speed of the load receiving table 2 according to the posture of the load receiving table 2.

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

The luggage loading portion 20 is arranged behind the loading platform 72. The luggage loading portion 20 is configured to include a loading surface 200 for loading luggage and a back surface 201 on the opposite side of the loading surface 200.

As described above, since the luggage loading portion 20 has a rectangular plate shape, one plate surface is the mounting surface 200 and the other plate surface is the back surface 201.

In the state where the loading platform 2 is switched to the upright posture, the mounting surface 200 is arranged toward the loading platform 72 side, and the back surface 201 is arranged toward the side opposite to the loading platform 72 side. Further, when the load receiving table 2 is switched to the deployed posture, the mounting surface 200 is arranged upward and the back surface 201 is arranged downward.

Further, in the luggage loading portion 20, an end side arranged on the starting point side of rotation (hereinafter referred to as a base end side) and an end side extending parallel to the base end side (hereinafter referred to as a tip side). ) And are included. In the present embodiment, a pair of end edges that are connected to the base end side and the tip end side and extend so as to be parallel to each other will be referred to as side end sides, and the following description will be given.

The stiffener 21 is provided on the back surface 201 of the luggage storage portion 20. Further, the stiffener 21 extends straight from the base end side side of the luggage loading portion 20 toward the tip end side side, and extends in the vertical width (that is, extends from the back surface 201) from the base end side side to the tip end side side. It is formed so that the output) gradually decreases. Therefore, the tip of the stiffener 21 is formed so as to have an acute angle.

The connecting structure 3 is a parallel link mechanism that moves together with the cradle 2 as shown by the solid line and the alternate long and short dash line in FIG. As shown in FIG. 2, the connecting structure 3 according to the present embodiment is long and has one end (base end) fixed in the longitudinal direction to the fixed side bracket 30 fixed to the vehicle 7 (chassis frame 70). The first arm 31 rotatably connected to the side bracket 30 and one end (base end) in the longitudinal direction rotatably connected to the fixed side bracket 30 in a posture that is long and parallel to or substantially parallel to the arm. The second arm 32 is rotatably connected to the tip of the first arm 31 and the tip of the second arm 32.

As shown in FIG. 3, a load receiving plate (loading portion 20) is rotatably connected to the movable bracket 33. Therefore, the load receiving plate (load placing portion 20) can rotate from the connection position with the movable bracket 33 as a starting point.

The elevating drive unit 4 is configured to elevate and elevate the load receiving table 2 by driving the connecting structure 3.

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

The base end of the first arm 31 is rotatably connected to the tilt link 40, and the tip of the elevating cylinder 41 is rotatably connected to the tip of the first arm 31.

Therefore, when the elevating cylinder 41 contracts, 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 raised accordingly. Further, the load receiving table 2 is configured to move up and down from a position where the lifting drive unit 4 touches the ground to a position corresponding to the floor surface of the loading platform 72.

Further, although not shown, the elevating drive unit 4 is configured to have an elevating operation means for expanding and contracting the elevating cylinder 41 (that is, elevating and lowering the load receiving base 2).

The elevating operation means can be configured to include, for example, a lowering operation unit that outputs a lowering control signal for lowering the load receiving table 2 and an ascending operation unit that outputs a lowering control signal for raising the loading platform 2. When the operation unit is operated, the lifting cylinder 41 contracts to lower the load receiving table 2, and when the raising operation unit is operated, the lifting cylinder 41 expands to raise the loading platform 2. Can be done.

The rotary drive unit 5 rotates the 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 base 2. It has an operating means (hereinafter referred to as a rotation operating means) 51 (see FIG. 4) operated by the user.

Since the other end of the rotary cylinder 50 is rotatably connected to the back surface 201 of the luggage loading portion 20, when the rotary cylinder 50 is extended, the back surface 201 of the luggage loading portion 20 is pushed up and the luggage loading portion 20 is extended. While the 20 rotates in the upright direction, when the rotary cylinder 50 contracts, the back surface 201 of the luggage loading portion 20 is pulled toward the movable bracket 33 side and rotates in the direction of falling sideways.

With this rotation, the load receiving table 2 is in a standing posture, a deployed posture, and a state of being raised above the deployed posture (more specifically, between the standing posture and the deployed posture, and in the deployed posture). The intermediate deployment side posture of the position on the placement position side, and the state of being tilted above the placement position in the middle deployment side posture and lower than the placement position in the standing posture (that is, the middle deployment). The posture can be changed to an intermediate standing side posture (a state in which the posture is placed between the placement position in the side posture and the placement position in the standing posture).

The loading platform 2 of the present embodiment is inclined downward so that the tip end side is located below the base end side when switched to the deployed posture, and the loading platform 72 is switched to the intermediate deployed side posture. It will be in a sideways position at the same height as.

Further, when the load receiving table 2 is switched to the intermediate standing side posture, the load receiving table 2 is in an inclined posture so that the tip end side is located above the base end side.

The rotation operating means 51 includes a tilting operation unit 510 that outputs a tilting control signal that rotates the load receiving table 2 in the tilting direction, and a triggering operation unit 511 that outputs a triggering control signal that rotates the load receiving platform 2 in the tilting direction. (See FIG. 4).

In the present embodiment, when the tilting operation unit 510 is operated, the rotary cylinder 50 contracts to rotate in the direction in which the load receiving table 2 is tilted, and when the raising operation unit 511 is operated, the rotary cylinder 50 expands. As a result, the load receiving table 2 rotates in the raising direction. The tilting operation unit 510 and the raising operation unit 511 may be composed of, for example, one switch, or may be composed of two switches such as an open / close switch and an upper switch, and an open / close switch and a lower switch. You may.

As shown in FIG. 4, the control means 6 detects the posture of the consignment cradle 2 and outputs a signal representing the posture, and the detection output means 60 and the reception status of the signal output from the detection output means 60. It has a speed setting means 61 for setting the rotation speed of the load receiving table 2 according to the above.

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

As shown in FIG. 4, the detection output means 60 according to the present embodiment includes two detection units for detecting the posture of the load receiving table 2, and more specifically, the load receiving table 2 has the first posture. It has a first detection unit 600 that detects that the first signal is output, and a second detection unit 601 that detects that the consignment 2 is in the second posture and outputs a second signal.

Since the angle of the load receiving table 2 in the intermediate deployment side posture is set to 0 degrees and the angle of the load receiving table 2 in the intermediate standing side posture is set to 5 degrees, the angle of the load receiving table 2 is 0 in the first detection unit 600. The first signal is output when the temperature is less than or equal to the degree, and the second detection unit 601 is configured to output the second signal when the angle of the cradle 2 is 5 degrees or more. Therefore, when the angle of the load receiving table 2 is less than 5 degrees and the third posture is larger than 0 degrees, the detection output means 60 is configured so as not to output the first signal or the second signal. The angle of the cradle 2 is the inclination of the cradle 2 when the ground is used as a reference. For example, the angle of the cradle 2 may be referred to as a position parallel to the cradle 2.

The speed setting means 61 considers the abnormality determination process for determining that the load receiving table 2 by the detection output means 60 is in an abnormal state (hereinafter referred to as an abnormal state) and the processing result of the abnormality determination process, and the load receiving table. It is configured to execute the speed setting process for setting the rotation speed of 2.

The speed setting means 61 can receive the first signal output from the first detection unit 600 and the second signal output from the second detection unit 601. In the abnormality determination process, the speed setting means 61 receives the first signal. In addition, when the second signal is being received, it is determined that the load receiving table 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 rotation speed of the cradle 2, and when only the first signal is received, the cradle 2 is set. Set the rotation speed of to a safe speed slower than the reference speed.

If the angle of the cradle 2 is less than 5 degrees and larger than 0 degrees, neither the first signal nor the second signal is output from the detection output means 60. In this case, the cradle 2 is used in the speed setting process. The rotation speed of is set to the safe speed.

Further, in the speed setting process, when the speed setting means 61 receives the first signal and the second signal, that is, when the load receiving table 2 is determined to be in the abnormal state by the abnormality determination process, the load receiving table is used. Regardless of the posture of 2, the rotation speed of the load receiving table 2 is set to a safe speed.

As described above, the speed setting means 61 is configured to set the rotation speed of the cradle 2 to a safe speed when the cradle 2 is in an abnormal state, that is, when the posture of the cradle 2 cannot be grasped. ..

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

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

On the other hand, when the load receiving table 2 rotates upward (standing posture side) from the state where it is in contact with the ground, it starts rotating at a safe speed, and when the load receiving table 2 tilts 5 degrees upward from the horizontal (this). In the embodiment, when the posture is switched to the intermediate standing posture, the rotation is performed at a reference speed until the standing posture is reached.

Further, when the load receiving table 2 is rotated upward or downward from a state in which the load receiving table 2 is tilted at 5 degrees or less (in this embodiment, a state in which the load receiving table 2 is tilted downward from the intermediate standing 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 load receiving table 2 is tilted more than 5 degrees (in the present embodiment, a state in which the load receiving table 2 is tilted upward from the intermediate standing side posture), the load receiving table 2 is rotated. It starts to rotate at the reference speed.

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

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

Then, in the state where the speed setting means 61 receives the first signal and the second signal, the abnormality determination process determines that the load receiving table 2 is in an abnormal state, so that the load receiving table 2 is in an abnormal state regardless of the posture. Rotate at a safe speed.

As described above, in the load receiving platform elevating device 1 of the present embodiment, in the normal state, only the first signal or the second signal is output from the detection output means 60, but the cause of failure of the detection output means 60 or the like. As a result, if the speed setting means 61 enters an abnormal state in which the first signal and the second signal are received, the rotation speed may be set to a speed that is not suitable for the posture of the load receiving table 2.

However, in the abnormal state, the speed setting means 61 of the load receiving table elevating device 1 sets the rotation speed of the load receiving table 2 to a safe speed regardless of the actual posture of the load receiving table 2, so that even in the abnormal state, the operator The cargo cradle 2 can be rotated at a speed within the range in which the cradle can work safely, so that even if an abnormality occurs in the detection of the posture of the cradle 2, the cargo can be safely loaded and unloaded. It can have an excellent effect of being able to.

The loading platform elevating device of the present invention is not limited to the above-described embodiment, and it goes without saying that 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 at the normal time, but is not limited to this configuration. 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 in a normal state.

When the detection output means 60 detects that the load receiving table 2 is in the first posture within the range from the deployed posture to the intermediate standing posture, the detection output means 60 outputs a first signal, and the range between the intermediate deployed posture and the standing posture. It suffices if it is configured to output a second signal when it detects that it is in the second posture. That is, when the load receiving table 2 is rotating between the intermediate deployment side posture and the intermediate standing side posture, the detection output means 60 outputs the first signal and the second signal. In FIG. 6, the cargo receiving table 2 is in the second posture.

In this case, the speed setting means 61 sets the reference speed as the rotation speed of the cradle 2 while receiving only the second signal, and the rotation speed of the cradle 2 while receiving at least the first signal. Is set to a safe speed slower than the reference speed, and the rotation speed of the consignment pedestal 2 may be set to the safe speed in an abnormal state in which the first signal and the second signal are not received.

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

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

Although not particularly mentioned in the above embodiment, for example, when the speed setting means 61 is in the state of receiving the inversion control signal or the start control signal and is in the state of recognizing the abnormal state, the start control is performed. The time required for the cargo cradle 2 to switch from the deployed posture to the intermediate standing side posture based on the time when the signal is received (that is, the posture in which the cargo cradle 2 is difficult to load or cannot be loaded beyond the horizontal state). The rotation speed of the consignment pedestal 2 may be set to the reference speed when the suppression time corresponding to the time required for switching to) has elapsed.

The suppression time may be set based on other conditions. For example, the time required for the posture of the load receiving table 2 to switch from the deployed posture to the intermediate deployment side posture may be set, or the load receiving table 2 may be set. The time required for the posture to switch from the intermediate deployment side posture to the intermediate standing side posture may be set.

However, it is preferable that the suppression time is set to the time required for switching from the state in which the inclination of the load receiving table 2 is 0 degrees or less to the state in which the load receiving table 2 is rotated to the standing posture side so as not to reach the standing posture side. More specifically, based on the ground contact angle of the cradle 2 with respect to the ground, from the state where the cradle 2 is 0 degrees until it tilts upward at an angle larger than the ground contact angle (that is, the load is loaded on the cradle 2). It is preferable that the required time is set to the suppression time (until the baggage is tilted so that it rolls or slides vigorously).

In this case, for example, as shown in FIG. 7, the speed setting means 61 is in an abnormal state (either the first signal or the second signal as shown in FIG. 5) at the time when the inversion control signal or the start control signal is received. When the suppression time elapses with reference to the time when the inversion control signal or the start control signal is received when recognizing (when none of them are received as shown in FIG. 6) It may be configured to set the rotation speed of the load receiving table 2 to the reference speed.

Further, as shown in FIG. 8, for example, the speed setting means 61 receives an inversion control signal or a start control signal, and then receives an abnormal state (either the first signal or the second signal) before the suppression time elapses. The rotation speed of the cradle 2 when the suppression time elapses with reference to the time when the tilt control signal or the start control signal is received when recognizing (when is also receiving, or when neither is received). May be configured to set the reference speed.

According to the above configuration, for example, when the lifting operation unit 511 is operated to raise the loading platform 2 in the intermediate deployment side posture, even if the loading platform 2 is in an abnormal state, the loading platform 2 waits for the loading platform 2 to tilt. Since the rotation speed of is set to the reference speed, for example, even if an abnormal state occurs when the loading platform 2 is switched from the deployed posture to the standing posture by operating the raising operation unit 511, the load is placed on the loading platform 2. In a state where there is a possibility that the load receiving table 2 can be rotated at a safe speed, the load receiving table 2 can be rotated at a reference speed when the load receiving table 2 is switched to a state in which no load is loaded. The time required to switch the table 2 to the standing posture can be shortened.

In the above embodiment, the load receiving table 2 is configured to be in a horizontal posture when in the intermediate deployment side posture, but the configuration is not limited to this. For example, the load receiving table 2 is tilted downward from the horizontal when in the intermediate deployment side posture (a posture tilted so that the tip side is located below the base end side) or tilted upward from the horizontal. It may be configured to be in a posture (a posture in which the tip side is inclined so as to be located above the base end side).

In the above embodiment, the load receiving table 2 is configured to be in a downwardly inclined posture so that the tip end side is located below the base end side when switched to the unfolded posture, but the configuration is limited to this configuration. Not done. For example, the loading platform 2 may be configured to be in a horizontal posture (a posture in which it is laid on its side at the same height as the loading platform 72) when it is switched to the deployed posture.

In this case, the load receiving table 2 is in an inclined posture so that the tip side is located above the base end side when switched to the intermediate deployment side posture, and when switched to the intermediate standing side posture, the load receiving table 2 is in the intermediate deployment side posture. It suffices if the posture is configured to be 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 particularly mentioned in the above embodiment, when the load receiving table 2 is rotated at a safe speed, for example, if the rotating cylinder 50 is a hydraulic cylinder, a flow rate is reduced 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 rotary cylinder 50 through the flow control valve. When rotating the load receiving table 2 at a reference speed, 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 oil to the rotary cylinder 50 is reduced, that is, the amount of oil discharged from the pump is reduced to the rotary cylinder 50. The amount of oil supplied to the cylinder may be reduced so that the cradle 2 rotates at a safe speed.

Further, when the rotary cylinder 50 is an electric cylinder, the load receiving table 2 may rotate at a safe speed by lowering the rotation speed of the motor that drives the rotary cylinder 50. In this case, for example, an open / close switch may be provided in the electric circuit to the rotary cylinder 50, and the switch may be continued to reduce the current value to reduce the rotation speed of the motor.

1 ... Loading platform lifting device, 2 ... Loading platform, 3 ... Connecting structure, 4 ... Lifting drive unit, 5 ... Rotation drive unit, 6 ... Control means, 7 ... Vehicle, 20 ... Luggage loading unit, 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 ... Rotating operating means, 60 ... Detection output means, 61 ... Speed setting means, 70 ... Chassis frame, 71 ... Subframe, 72 ... Loading platform, 200 ... Mounting surface, 201 ... Back side, 510 ... Tilt operation unit, 511 ... Starting operation unit, 600 ... First detection unit, 601 … Second detector

Claims (5)

A loading platform that receives luggage to be loaded and unloaded on the loading platform of the vehicle,
An elevating drive unit that raises and lowers the loading platform with respect to the loading platform,
A rotary drive unit that changes the posture of the cradle by rotating the cradle, and
A control means for controlling the rotation speed of the cradle according to the posture of the cradle is provided.
The cradle can change its posture between an upright posture and a unfolded posture extended to the rotating end by the rotation.
The control means is a detection output means that detects the posture of the consignment and outputs a signal according to the posture, and a rotation speed of the consignment according to the reception status of the signal output from the detection output means. Has a speed setting means to set
When the detection output means detects that the load receiving table is in the first posture within the range up to the intermediate deployment side posture rotated upward from the position in the deployment posture, the detection output means outputs a first signal and receives the load. It is configured to output a second signal when the table is in the second posture within the range from the intermediate standing posture rotated upward from the position in the intermediate deployment side posture to the standing posture.
The speed setting means sets a reference speed as the rotation speed of the cradle in a state where only the second signal is received, and sets the rotation speed of the cradle in a state where only the first signal is received. It is configured to set a safe speed slower than the reference speed and set the rotation speed of the consignment to the safe speed in an abnormal state in which both the first signal and the second signal are received. Ru,
Loading platform lifting device. A loading platform that receives luggage to be loaded and unloaded on the loading platform of the vehicle,
An elevating drive unit that raises and lowers the loading platform with respect to the loading platform,
A rotary drive unit that changes the posture of the cradle by rotating the cradle, and
A control means for controlling the rotation speed of the cradle according to the posture of the cradle is provided.
The cradle can change its posture between an upright posture and a unfolded posture extended to the rotating end by the rotation.
The control means is a detection output means that detects the posture of the consignment and outputs a signal according to the posture, and a rotation speed of the consignment according to the reception status of the signal output from the detection output means. Has a speed setting means to set
When the detection output means detects that the load receiving table is in the first posture within the range from the unfolded posture to the intermediate standing side posture rotated upward from the position in the unfolded posture, the first signal is output. When it is output and it is detected that it is the second posture within the range from the deployed side posture to the standing posture while it is located between the position in the deployed posture and the position in the intermediate standing side posture, the second posture is obtained. It is configured to output two signals,
The speed setting means sets a reference speed as the rotation speed of the cradle while receiving only the second signal, and sets the rotation speed of the cradle at least while receiving the first signal. It is configured to set the safe speed slower than the reference speed and set the rotation speed of the consignment to the safe speed in an abnormal state in which neither the first signal nor the second signal is received. Ru,
Loading platform lifting device. The detection output means
A first detection unit that detects that the loading platform is in the first posture and outputs the first signal,
It has a second detection unit that detects that the loading platform is in the second posture and outputs the second signal.
The speed setting means rotates the cradle in an abnormal 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 the speed to said safe speed,
The loading platform elevating device according to claim 1 or 2. A rotation operating means operated by the user to rotate the cradle is provided.
The rotation operating means
A tilting operation unit that outputs a tilting control signal that rotates the loading platform in the tilting direction,
It has a start-up operation unit that outputs a start-up control signal that rotates the load receiving table in the direction of raising it.
The speed setting means
In the state of receiving the tilt control signal or the trigger control signal and recognizing the abnormal state, a predetermined suppression time has elapsed with reference to the time when the trigger control signal is received. At the time point, the rotation speed of the cradle is configured to be set to the reference speed.
The load receiving platform elevating device according to any one of claims 1 to 3. The loading platform is configured to tilt upward from the horizontal when in the intermediate deployment side posture.
The restraint time is a time corresponding to the time required for the consignment stand to switch from the unfolded posture to the intermediate unfolded posture.
The loading platform elevating device according to claim 4.