JPH0676141B2 - Platform position control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a luggage carrier position regulating device for regulating the position of a rear portion of a cargo carrier such as a truck and unloading from the cargo carrier.

[Conventional technology]

As a conventional technology relating to a method for controlling the position of a bed and an apparatus therefor, which is applied to an unloading method from a bed such as a truck,
Those described in Japanese Examined Patent Publication No. 52-14509 and Japanese Utility Model Laid-Open No. 61-139932 are known.

Explaining the conventional technique described in the above publication, Japanese Patent Publication No. 52-14509 discloses a truck mounted on a vehicle body of a truck through a guide member provided on a supporting leg of an unloading conveyor and a supporting arm. There is described a cargo unloading device including a leveling device including guide rollers that are inserted into guide members when landing on an unloading point.

Further, in Japanese Utility Model Laid-Open No. 61-139932, an auxiliary bumper is fixed on the track side and a stopper capable of contacting the auxiliary bumper on the ground side, and a plurality of stoppers provided on the contact surface of the stopper. , A truck bed fixing device having a proximity switch and a vertically movable fixing member.

[Problems to be solved by the invention]

However, the above conventional techniques have the following problems.

That is, the level adjusting device described in Japanese Patent Publication No. 52-14509 can forcibly make the heights of the loading platform and the unloading conveyor coincide with each other while unloading the load from the loading platform of the truck. It is not possible to adjust the level according to the bed height of various different trucks, and when a truck with a certain bed height lands at the unloading point, the bed height slightly rises or falls depending on the loading state. The height can only be matched to the height of the unloading conveyor.

In addition, the truck bed fixing device described in Japanese Utility Model Laid-Open No. 61-139932 can be fixed so that the truck bed is not lowered, but when the truck bed rises due to unloading, the truck bed is fixed. could not.

Therefore, an object of the present invention is to provide a carrier for various trucks,
An object of the present invention is to provide a bed position regulating device that can regulate the height to a constant level during unloading.

[Means for solving problems]

The present invention relates to a rear portion of a load carrier such as a truck, which includes at least two vertically movable load carrier supports and a hydraulic drive control device that operates a hydraulic cylinder for vertically moving the load carrier supports via a tuning valve. In the load carrier position restricting device for restricting the vertical position of the load carrier, the load carrier support bracket is provided at the same position as the support member and has a displacement member that is displaced by a contact with the bottom of the cargo carrier, and the displaced displacement bracket. A detector that is operated by a member to detect the starting point of pushing up the platform is provided, and the hydraulic drive control device pushes up the platform support by a preset amount from the position detected by the detector. A cargo bed position regulating device having:

〔Example〕

In the following, first, an example of an apparatus for unloading the cargo bed position regulating apparatus of the present invention shown in the drawings will be described.

FIG. 1 and FIG. 2 are a plan view and a front view, respectively, showing the outline of an embodiment of an unloading device in which the bed position regulating device of the present invention is used. In the above drawings, 1 is an unloading device, 2 is a truck bed, and 3 and 3'are warehouses (not shown).
Is a pair of warehousing conveyors. Wo is the inner size (width) of the loading platform 2 and is shown in FIG. 1 at the position where the truck is accurately landed on the center of the berth center. Also, A, A ′
Is the maximum permissible range of the lateral displacement of the bed 2 due to the lateral landing displacement of the truck to the berth center with respect to its forward direction. Further, 4a and 4'a are loads such as two rows of pallets on the loading platform 2 when the truck is landed on the leftmost side of the berth center with respect to the forward direction, and 4b and 4'b are the trucks on the contrary. Two rows of loads on the loading platform 2 when landing on the rightmost side of the berth center in the direction, and W is the width of these loads. In the present specification and drawings, in principle, the same members or parts are designated by the same reference numerals, and those on the right side with respect to the unloading direction (direction opposite to the forward direction of the truck) are marked with a dash. The left side of the direction shall not have a dash.

Thus, the unloading device 1 includes a pair of unloading conveyors 6 on oscillating devices (“oscillation” means an operation in which one end is a fulcrum and the other end moves up and down.) 5, 5 ′. , 6'and a pair of load receiving conveyors 7 and 7'are provided to constitute the main body of the load receiving conveyor according to the loading surface of the load platform 2.
In a state where the 6, 6'swing, the loads 4a, 4'a or 4b, 4'b placed in two rows on the loading platform 2 are directly received by the pair of load receiving conveyors 7, 7 ', respectively. After that, the load
The pair of unloading conveyors 6 and 6 ′ unloads them so as to form a gap between the rows of 4a and 4′a or between the rows of 4b and 4′b and carries them out to the storage conveyors 3 and 3 ′, respectively. It is done like this.

The unloading device 1 will be described in further detail with reference to FIGS. 3 to 7 showing the details thereof.
Are mainly composed of the swing frames 51, 51 ', respectively, and the upper entry storage conveyor 3,
While the 3'side is rotatably supported by the support portions 52, 52 ',
The loading platform 2 side is configured to be vertically driven by vertical drive units 53, 53 '. In the present embodiment, the vertical drive portions 53, 53 'are of the crank type, but may be of the eccentric cam type or the cylinder type such as hydraulic pressure. 11 and 11 are two detectors arranged on the upper and lower sides.
It is attached to the loading platform 2 side of the rocking frame 51 while being positioned a certain distance below the loading surface of the load. Also, the vertical drive
53, 53 'are the detectors 11, 11 from the loading surface of the load on the loading platform 2.
It is designed such that a reflecting plate 21 which is located below the fixed distance and is provided on the rear portion of the truck so as to be freely engaged and disengaged can be detected by both of the detectors 11 and 11 in correspondence with the above. And the loading surface of the load on the loading platform 2 side of the unloading device 1 are made to coincide with each other. In order to reliably detect the reflection plate 21 by the upper and lower detectors 11, 11, the upper and lower detectors 11 and 11 should be set in the load carrying-out direction in order to reliably perform the detection regardless of the deviation of the left and right landing positions of the truck. It is preferable that a plurality of reflectors 21 be widened while a plurality of them are arranged in parallel at right angles.

Also, the pair of load receiving conveyors 7, 7'of the unloading device 1
Is a chain conveyor having two endless chains 71, 71, ... Arranged on both sides of the rocking frames 51, 51 'of the above-mentioned rocking device, respectively. I am doing it. The load receiving conveyor 7 on the left side of the load carrying-out direction supports the load on the left side of the loading platform 2 in the carrying-out direction by at least three endless chains 71, 71, 71 regardless of the landing mode of the truck to the berth station. The other cargo receiving conveyor 7'is formed similarly. Further, 72, 72 'are drive parts of the load receiving conveyors 7, 7', respectively, and 73, 73, 73 and 73 ', 73', 73 'are load receiving conveyors 7, 7.
7'Rollers arranged at the tip of each cargo bed 2 side,
These 73, 73, 73 and 73 ', 73', 73 'have a structure in which they can be rotated only in the unloading direction, respectively. When unloading the load at the rearmost end of the loading platform 2, that is, the start of unloading. When the load receiving conveyors 7 and 7 ′ are stopped, the driver (unloading worker) stands on the load receiving conveyors 7 and 7 ′ to safely and easily load such loads 73, 73, 73 and 73. It is designed so that it can be drawn on the ‘73’ and ‘73’. Also, the rollers 73, 73, 73 and 73 ', 7
3'and 73 'have ratchets incorporated therein so as to be interlocked with the load receiving conveyors 7 and 7'when the load receiving conveyors 7 and 7'are activated. The load receiving conveyors 7 and 7'may be configured by roller conveyors, but by configuring them by chain conveyors, it is possible to arrange a deck plate between endless chains so that workers can walk. Moreover, there is an advantage that holes can be formed in the deck plate and various control detectors can be mounted.

Also, the pair of unloading conveyors 6, 6'of the unloading device 1
Is a rocking frame 51, 51 'on the receiving conveyor 3, 3'side of the rocking device 5, 5', which is connected to the load receiving conveyor 7, 7 '.
Mainly consists of a pair of roller conveyors 61, 61 ', which are fixedly mounted on and are arranged with rollers (hereinafter referred to as skew rollers) 62, 62, ... And 62', 62 ',. Is configured as. These skew rollers 62, 62, ... And 6
2'and 62 'are arranged obliquely so as to move the load obliquely outward with respect to the carry-out direction, and are driven by the skew roller drive units 63, 63'. is there. The inner end spacing between the skew rollers 62, 62, ... of the roller conveyor section 61 on the left side in the carry-out direction and the skew rollers 62 ', 62' ,. Load 4 on the left side on the loading platform 2 regardless of bed sickness
a, 4b can be continuously unloaded by the left roller conveyor section 61, and right side loads 4'a, 4'b on the loading platform 2 can be continuously unloaded by the right roller conveyor section 61 '. As described above, the width of the load is 1/4 to 1/2. This inner edge spacing is
If it is less than 1/4, part of the load 4a to be unloaded by the left roller conveyor 61 is not unloaded at a predetermined position because it partially rides on the right roller conveyor 61 ', or the right roller conveyor 61 If the load 4'b to be unloaded at ′ is partially loaded on the roller conveyor section 61 on the left side and is not unloaded at a predetermined position, or if the inner end spacing exceeds 1/2, the left and right sides of the truck are unloaded. Depending on the amount of landing deviation, the load 4a to be unloaded by the left roller conveyor 61 cannot be supported by the left roller conveyor 61, or the load 4'b that must be unloaded by the right roller conveyor 61 ' It cannot be unloaded because it cannot be supported by the right roller conveyor 61 '. In addition, casters 64, 64, ..., Which can be oriented in any direction, are provided between the inner ends to load the load on the skew rollers 62, 62 ,.
62 ', 62', ... and casters 64, 64 ,. The casters 64, 64, ... May be wheels, rollers or the like. In addition, skew rollers 62, 62, ...
A pair of guides 65, 65 'each having a large number of guide rollers are provided for guiding the load moving outward by 62', 62 '... In the direction of the storage conveyors 3, 3'. The width of this guide 65, 65 'is Wo + 2A or more, and the conveyor 3
The width of the center pitch of 3'is the width of the guides 65 and 65 '(Wo +
The width of the load (W) is smaller than 2A). (Ie Wo
+ 2A-W). The height of the roller conveyors 61, 61 'on the storage conveyors 3, 3'side is set equal to the height of the storage conveyors 3, 3'. Also, 66,66, ... and 66 ', 66', ..
Are ordinary rollers provided at the tips of the roller conveyors 61, 61 'on the side of the loading platform 2.

In addition, in the drawings, 8 and 8 ′ are work benches.

Further, in FIG. 1 and FIG. 2, reference numeral 100 denotes a front and rear position regulating device (truck stopper) for stopping (landing) a truck just before the unloading device 1 and regulating the position of the front and rear direction of the luggage carrier 2. , 200 is a loading platform as a loading platform position regulating device of the present invention that regulates the vertical position of the loading platform 2 so as to prevent the loading platform 2 of the truck from moving up and down by unloading the loads 4a, 4'a etc. from the truck. It is a vertical position control device (loading device fixing device).

Next, the bed top / bottom position restricting apparatus 200, which is one embodiment of the bed position restricting apparatus of the present invention, will be described in detail with reference to FIGS. 8 to 11.

As shown in FIGS. 1 and 2, the loading platform vertical position regulating device 200 is installed at a position just before the truck landing berth side of the unloading device 1.

That is, the loading platform vertical position regulating device 200 fixes the two support frames 202 with a space between them on the bottom of the pit-shaped storage portion 201 formed on the floor surface of the unloading device 1 immediately before the truck landing berth side. The rotary shaft 204 is rotatably supported by the bearing 203 fixed to the upper part of each support frame 202,
It is formed by attaching and fixing a pair of hydraulic cylinders (carriage bed position restricting portions) 205 to both ends of the rotating shaft 204. Both of the hydraulic cylinders 205 are fixed by fastening the cylinder mounting portion 206 to the vertical rotation shaft 204 with a fixing bolt 207. A platform support 208 and a platform detection bracket 209 are provided on the upper end of the piston rod of the hydraulic cylinder 205. The loading platform detection bracket 209 is resiliently urged upward by a spring 210 and is lowered downward by the load exerted by the auxiliary bumper 2A of the truck, and its lower end flange 209A causes a detector provided on the main body of the hydraulic cylinder 205. (Limit switch) 211 is said to be operable.
In the figure, 212 and 213 are hydraulic hoses.

Further, in the above-described loading platform vertical position restricting device 200, the lower limit detection bracket 214 provided on the upper end of the piston rod of the hydraulic cylinder 205 operates by operating the lower limit detector (limit switch) 215 provided on the main body of the hydraulic cylinder 205. It is also possible to detect the lowered state of the hydraulic cylinder 205.

Further, in the loading platform vertical position restricting device 200, a motor (drive unit) 216 with a brake and a speed reducer is provided on one of the support frames 202.
Is fixedly installed, and a chain 219 is wound around a drive sprocket 217 fixed to the output shaft of the motor 216 and a driven sprocket 218 fixed to one end of the rotating shaft 204.

As a result, the loading platform up-and-down position regulating device 200 is operated by the motor
By driving, the hydraulic cylinder 205 can be changed from the upright state to the horizontal state with the rotation of the rotation shaft 204. That is, the hydraulic cylinder 205 can be selectively set to either a working state for position regulation shown by a solid line in FIGS. 8 to 10 or a stored state shown by a two-dot chain line in FIG. . This hydraulic cylinder 205 is set to the working state by setting the upright detection bracket 220 fixed to the rotary shaft 204.
Is detected by operating an upright detector (limit switch) 221 fixed to the support frame 202, and the detection result can be displayed by turning on a landing enable lamp (not shown). . When the hydraulic cylinder 205 is stored in the storage portion 201, the fall detection bracket 222 fixed to the rotating shaft 204 operates the fall detector (limit switch) 223 fixed to the support frame 202. To be detected.

Next, one embodiment of the method for regulating the position of the bed by the apparatus for regulating the position of the bed of the present invention will be described in detail by taking as an example the case of using the device for vertically controlling the bed. That is, when the loading platform vertical position regulating device 200 unloads from the loading platform 2 of the lift roller conveyor mounting truck using the above-mentioned unloading system 1, the hydraulic cylinder 205 is shown by a solid line in FIGS. 8 to 10. Set the work state like this (track mode). On the other hand,
When unloading using a forklift, the hydraulic cylinder 205 is set to the storage state (fork mode) as shown by the two-dot chain line in FIG.

Therefore, according to the loading platform up-and-down position regulating device 200, in the truck mode, a truck that can be unloaded from the rear side and has the auxiliary bumper 2A attached is brought into contact with the loading platform front-and-back position regulating device 100 and landed. After that, by pressing the raising operation button (not shown), the hydraulic cylinder
It is possible to raise the platform support 208 of the 205. In order to raise the platform support 208 and regulate the position of the platform 2, the platform detection bracket 209 that has been elastically springed in advance by the spring 210 is brought into contact with the auxiliary bumper 2A, and the detector 211 is activated by the collar 209A. Then, after detecting and confirming the push-up start point, the lift is stopped at a position further raised by 20 to 300 mm (fixing of the loading platform is completed). When the truck is actually loaded, the loading platform level is lowered, but when the loading platform 2 is not fixed, the loading platform 2 rises as the load is unloaded, and the loading platform level rises. In this embodiment, the inconvenience is solved by fixing the level of the loading platform 2 to a high position in advance. Therefore, the unloading device 1
Then, it becomes possible to stably perform the unloading operation without considering the vertical movement of the loading platform 2. Then, after unloading is completed using the unloading device 1, the lowering operation button (not shown) can be pressed to lower the platform support 208, and the lower and lower limit detection brackets 214 can be used as the lower limit. By operating the detector 215, it is possible to stop the lowering of the platform support 208. As described above, after the push-up state by the bed supporting unit 208 is released, the truck can start.

In addition, in the loading platform up-and-down position regulating device 200, in the fork mode, the hydraulic cylinder 205 can be tumbled by pushing a tumbling button (not shown). In this case, it is preferable that the hydraulic cylinder 205 can be turned over only when the lower limit detector 215 detects the contracted state of the piston rod. When the hydraulic cylinder 205 falls, the motor 216 is rotated and the rotary shaft is rotated.
This is performed by rotating 204, and the driving force at that time is transmitted from the driving sprocket 217 to the driven sprocket 218 via the chain 219. When the fall detector 223 detects the fall detection bracket 222, the operation of the motor 216 is stopped (fall complete). Since the hydraulic cylinder 205 is housed inside the storage unit 201 in a completely inverted state, if a lid is placed on the upper part of the storage unit 201, the forklift can travel into the upper region of the storage unit 201. In this way, the occupancy state of the loading platform up-and-down position regulation device 200 with respect to the floor berth of the truck can be released, so that a wide traveling space for the forklift can be formed.

In the loading platform up-and-down regulating device 200, when the hydraulic cylinder 205 supports the auxiliary bumper 2A of the truck in the upright state, the load transmitted via the hydraulic cylinder 205 is transferred by the rotating shaft 204 and the bearing 203. Since it receives it, it can support a large load with a simple structure. Also, at that time,
Since the hydraulic cylinder 205 is in the upright state, almost no load is applied to the chain 219 used when changing the state of the hydraulic cylinder 205. Therefore, the motor 216, the drive sprocket 217, the driven sprocket 21
8. The chain 219 only needs to have an output and strength sufficient to cause the hydraulic cylinder 205 to fall over or stand upright, and as a result, the cargo bed vertical position restricting device 200 itself can be made small in capacity and small in size.

Further, in the hydraulic cylinder 205, the platform support 208 is moved up and down via a control circuit as shown in FIG. That is, 301 is a solenoid valve, 302 is a throttle check modular valve, 303 is a reciprocating tuning valve (de-co valve) for tuning both going and returning processes, and 304 is a pilot operated check valve. Since the pair of hydraulic cylinders 205, 205 are configured to move up and down in synchronization with each other by the reciprocating tuning valve 303, even when the truck bed 2 is tilted in the left-right direction due to the accumulated load, The carrier 2 can be straightened horizontally.

That is, according to the loading platform vertical position restricting apparatus 200 of the present invention, the hydraulic cylinder is used when unloading from the loading platform 2 of the truck.
By the loading platform support 208 that is provided in 205 and can move up and down,
The position of the platform 2 can be easily regulated at least above the height when the platform is empty. At that time, even if the amount of cargo is taken into consideration, the height of the cargo bed in a loaded state, that is, the height of the cargo bed before starting unloading is 20 to 300 m.
By restricting the lifted position, it is possible to restrict the position of the loading platform of a normal truck or the like to a height higher than the height when there is no load, and moreover, the loading platform vertical position regulating device 20 of the present invention.
With 0, since the hydraulic cylinder 205 is moved up and down via the tuning valve 303, the loading platform 2 can be corrected horizontally and the position is regulated so that the loading platform 2 does not move up and down during unloading. it can.

When unloading using the loading platform up-and-down position regulation device 200 configured as described above, as long as the truck is landed within the error range of A from the center of the berth station, the driver (work Member) just pushes the load from the loading platform 2. The pushed-out load is continuously carried out to the warehousing conveyors 3 and 3 ′ while the position is adjusted by the unloading device 1.

That is, the loading surface of the load 2 on the loading platform 2 pushed up by the loading platform support 208 and the loading surface of the loading unit 2 on the loading platform 2 side have the reflection plate 21 attached to the rear portion of the truck as described above. By rocking the rocking frames 51, 51 'of the rocking devices 5, 5'detected by the detectors 11, 11, they are controlled so as to match regardless of the vehicle type of the truck. If the landing position of is within the above-mentioned error range, the load receiving conveyors 7 and 7'of the unloading device 1 face the left and right loads of the loading platform 2 respectively, and thus the unloading from the loading platform 2 of the truck to the unloading system 1 is performed. The shaving can be easily performed by the worker simply pushing out the load. Then, the extruded loads 4a, 4'a or 4b,
4'b is unloaded to the unloading conveyors 6 and 6'as it is by the load receiving conveyors 7 and 7 '.
6 and 6'include tilting rollers 62, 62, ... and 6 as described above.
2'and 62 'are provided and casters 64, 64, ... are provided between the inner ends of these rollers, so that the load 4a or
Before reaching the storage conveyor 3 on the left side, 4b ensures that the roller guide 61 on the left side guides the guide 65 on the left side.
It is pushed out to the left storage conveyor 3 while its direction is adjusted, and 4'a or 4'b.
Similarly, by separating the load 4a or 4b from the load 4a or 4b, the roller conveyor 61 'on the right side surely presses the guide 65' on the right side until it reaches the storage conveyor 3'on the right side. It is carried out to the storage conveyor 3'on the right side while being adjusted.

Although the embodiment of the luggage carrier position regulating device of the present invention and the embodiment of the luggage carrier position regulating method by the luggage carrier position regulating device of the present invention have been described above, the invention is not limited thereto.
For example, the amount of pushing up the loading platform is appropriately selected according to the size of the truck, etc., and for large trucks (11 ton vehicles), it is preferably 30 to 200 mm, more preferably 40 to 150 mm.
mm. The above-mentioned amount of push-up is within a range in which the wheels of an ordinary truck are in contact with the ground even when the load-carrying position is pushed up to a position higher than the load-carrying position when the cargo is empty.

Further, the number of hydraulic cylinders may be three, and the tuning valve may be a one-way (only when pushing up) tuning valve.

Further, the loading platform position regulating device of the present invention can be effectively used not only when unloading as described above but also when loading.

〔The invention's effect〕

According to the present invention, regardless of the type, the rear portion of the loading platform such as a truck can be horizontally regulated at a constant height during unloading, and as a result, the work of restraining loading from the loading platform can be performed. Can improve the efficiency of. Moreover, since the starting point for pushing up the loading platform is detected and the loading platform is pushed up by a preset amount from the detected position, the rising position of the loading platform can be restricted to an appropriate position, and multiple hydraulic cylinders can be used. Since it is configured to move up and down in synchronism, even if the loading platform such as a truck is tilted by the loaded load, the loading platform can be automatically corrected horizontally and fixed at a certain height. .

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an unloading device used together with a loading platform vertical position restricting device of an embodiment of the present invention, FIG. 2 is a schematic front view thereof, and FIGS. 3, 4, 5 Figure and Sixth
The drawings are respectively a plan view, a front view, a left side view and a right side view of the main parts thereof, and FIG. 7 is an enlarged partial front view of the load receiving conveyor. Further, FIG. 8 is a schematic plan view showing a loading platform vertical position regulating device according to an embodiment of the present invention, FIG. 9 is a schematic side view thereof, FIG. 10 is a schematic front view thereof, and FIG. 11 is a control circuit diagram thereof. Is. 2 …… Bag, 200 …… Bag top / bottom position regulation device 205 …… Hydraulic cylinder 208 …… Bag support 303 …… Reciprocating tuning valve.

Claims (1)

[Claims] 1. A loading platform for a truck or the like, comprising at least two vertically movable loading platform supports and a hydraulic drive control device for operating a hydraulic cylinder for vertically moving the loading platform supports via a tuning valve. In a luggage carrier position regulating device that regulates a vertical position of a rear portion, a luggage carrier detection bracket provided at the luggage carrier support portion at the same position as the support portion and having a displacement member that is displaced by contact with a bottom portion of the luggage carrier, A detector which is operated by a displacement member and detects a push-up start point of the platform is provided, and the hydraulic drive control device pushes up the platform support by a preset amount from the position detected by the detector. A carrier position regulating device having a regulating circuit.