JP5429834B1 - Falling prevention device for picking lift and picking lift provided with the fall prevention device - Google Patents

Abstract

To provide a fall prevention device and a picking lift capable of preventing an operator who wants to perform a picking work from falling from a cab.
A fall prevention device according to the present invention prevents an operator from falling in a picking lift 1A provided with a cab 4 that can be moved up and down, and is close to a rear end portion of a head guard 14. A guard member 31 that can take a position and a separated position away from the rear end, a pallet detection sensor 21 that detects whether or not the fork 12 is inserted into the pallet P, and a detection result of the pallet detection sensor 21 The control part which controls the position of the guard member 31 based on this is provided. When the fork 12 is inserted into the pallet P, the control unit sets the position of the guard member 31 as the separation position, and otherwise sets the position of the guard member 31 as the proximity position.
[Selection] Figure 1

Description

  The present invention relates to a fall prevention device that prevents an operator who has boarded a cab of a picking lift from falling, and a picking lift including the fall prevention device.

  The picking lift is a type of forklift that includes a vehicle main body 2 incorporating a battery, a traveling motor, and the like, a mast 3 provided behind the vehicle main body 2, and a cab 4 that moves up and down along the mast 3. . As shown in FIG. 6, the driver's cab 4 of the picking lift 100 normally includes a step 10, a head guard 14 that covers the overhead of the operator who has boarded the step 10, an operation panel 15 provided in front of the operator, 10 and a pair of forks 12 extending rearward from the rear end portion 11.

  The cab 4 is provided with a guard 20 for preventing an operator from falling. According to this guard 20, the movement of the operator operating the operation panel 15 can be restricted and confined on the step 10, so that an operator who has accidentally stepped out of the step 10 falls from the cab 4. Can be prevented.

  In addition to the guard 20, safety guards and the like disclosed in Patent Document 1 and Patent Document 2 are conventionally known as fall prevention devices intended to restrict the movement of the operator and confine it on the step 10. .

Japanese Patent Laid-Open No. 08-113486 No. 07-056305

  However, the conventional fall prevention device is used by an operator who wants to perform a picking operation to move a load loaded on the pallet P to a rack (not shown) or move a load stored in the rack to the pallet P. It was not effective against falling.

  That is, in order to perform the picking work, it is necessary to first operate the operation panel 15 to move the cab 4 to a high place, lift up the guard 20 to release the restriction, and transfer from the step 10 to the pallet P. However, in the conventional fall prevention device, even though the pallet P does not exist, it is not possible to prevent an operator who tries to transfer to the pallet P without noticing it from falling from the rear end 11 side of the step 10. could not.

  The present invention has been made in view of the above circumstances, and the problem is that a fall prevention device that can prevent an operator who wants to perform a picking work from falling from the cab, and the fall prevention device. It is in providing a picking lift provided with.

  In order to solve the above-described problem, a fall prevention device according to the present invention includes a step, a head guard that covers the overhead of an operator who has boarded the step, and a pair of forks extending rearward from the rear end portion of the step. An anti-falling device for preventing an operator from falling down in a picking lift having a cab that can be moved up and down, and a proximity position close to the rear end of the head guard and a distance away from the rear end A guard member that can take a position, a pallet detection sensor that detects whether or not the fork is inserted into the pallet, and a control unit that controls the position of the guard member based on the detection result of the pallet detection sensor. When the fork is inserted into the pallet, the guard member is placed in the separated position while the fork is inserted into the pallet. If not, it is characterized in that a proximity position the position of the guard member.

  In this configuration, the position of the guard member changes depending on whether or not the fork is inserted into the pallet. More specifically, when the fork is not inserted into the pallet, the position of the guard member is set to the close position, while when the fork is inserted into the pallet, the position of the guard member is set to the separated position. Therefore, according to this configuration, it is possible to make the operator who performs the picking work aware of the presence or absence of the pallet depending on whether the guard member is near or far away, and to prevent the operator from falling.

  As a specific configuration of the fall prevention device, for example, an expansion / contraction member that can be expanded and contracted in the front-rear direction, the front end is fixed to the head guard, and the rear end protrudes rearward from the rear end portion of the head guard. A configuration is also possible in which a guard member is supported on the rear end of the expansion / contraction member while further providing what is obtained.

  According to this configuration, the position of the guard member can be set to the proximity position or the separation position by the control unit extending or retracting the expansion / contraction member based on the detection result of the pallet detection sensor.

  The fall prevention device further includes a lift detection sensor that detects the lift of the driver's cab, and the control unit detects the height of the guard member based on the detection result of the pallet detection sensor and the lift detected by the lift detection sensor. It is preferable to control the position.

  In high places where picking work is performed, it is essential to change the position of the guard member depending on whether or not the fork is inserted into the pallet, but in low places where falling does not become a serious problem, the fork It may be preferable not to change the position of the guard member uniformly depending on whether or not it is inserted into. According to this configuration, it is possible to more flexibly control the position of the guard member based on both the detection result of the pallet detection sensor and the lift detected by the lift detection sensor.

  In addition, as a guard member, what consists of a flat board which has translucency, and becomes like the warmth which hung down from the rear-end part of the head guard when it is set as a close position can be used, for example.

  In order to solve the above-described problems, a picking lift according to the present invention includes the above-described fall prevention device.

  ADVANTAGE OF THE INVENTION According to this invention, the fall prevention apparatus which can prevent that the operator who performs picking work falls from a cab, and the picking lift provided with this fall prevention apparatus can be provided.

It is a side view of the picking lift provided with the fall prevention device concerning a 1st embodiment of the present invention. It is a block diagram regarding control of the picking lift concerning a 1st embodiment. It is a figure which shows the head guard of the picking lift which concerns on 1st Embodiment, and 2nd Embodiment, and its periphery, Comprising: (A) is a top view, (B) is a rear view. It is a side view of a picking lift provided with the fall prevention device concerning a 2nd embodiment of the present invention. It is a block diagram regarding control of the picking lift concerning a 2nd embodiment. It is a perspective view of the conventional picking lift.

  Hereinafter, embodiments of a fall prevention device and a picking lift according to the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 shows a picking lift provided with a fall prevention device according to a first embodiment of the present invention. Similar to the conventional picking lift 100 (see FIG. 6), the picking lift 1A according to this embodiment includes a vehicle main body 2 incorporating a battery, a driving motor, and the like, a mast 3 provided at the rear of the vehicle main body 2, A cab 4 that moves up and down along the mast 3 is provided.

  The driver's cab 4 mainly includes step 10, a head guard 14 that covers the head of the operator who has boarded the step 10, and a pair of left and right side frames 13 (13R, 13L) that support the head guard 14 by sandwiching it from the left and right sides. , A pair of forks 12 extending rearward from the rear end portion 11 of step 10, a guard 20 capable of restricting the movement of the operator, an operation panel 15 for operating the picking lift 1A, and a brake pedal 19 Contains.

  Further, in the cab 4, the guard member 31 capable of taking a close position close to the rear end portion of the head guard 14 and a separated position away from the rear end portion and the fork 12 is inserted into the pallet P. And a pallet detection sensor 21 for detecting whether or not.

  FIG. 2 is a block diagram relating to the control of the picking lift 1A. As shown in the figure, a control unit 40A composed of an MPU (Micro Processing Unit) includes a key switch 16, an accelerator lever 17 and a lift switch 18 provided on the operation panel 15, and a brake pedal 19 provided on the step 10. Then, a signal from the guard 20 is input. Then, the control unit 40A controls the traveling motor, the electromagnetic brake, and the mast 3 based on the input signal.

  More specifically, the control unit 40A operates the accelerator lever 17, the lift switch 18 or the brake when the key switch 16 is turned on and the guard 20 is in a use state (a lowered state shown by a solid line in FIG. 1). When the pedal 19 is operated, the driving motor, the electromagnetic brake or the mast 3 is driven according to the operation amount, and the picking lift 1A is driven / stopped, and the cab 4 is moved up and down. On the other hand, when the key switch 16 is not turned on or when the guard 20 is in a non-use state (a state in which the guard 20 is flipped up as shown by a one-dot chain line in FIG. 1), the accelerator lever 17, the lift switch 18 or the brake pedal Even if 19 is operated, the control unit 40A does not run / stop the picking lift 1A or raise or lower the cab 4.

  The control unit 40 </ b> A further controls the power cylinder 32 provided in the head guard 14 based on the detection result of the pallet detection sensor 21.

  More specifically, when the fork 12 is inserted into the pallet P, the control unit 40A extends the power cylinder 32 to set the position of the guard member 31 to the separated position (the position indicated by the solid line in FIG. 1). When the fork 12 is not inserted into the pallet P, the position of the guard member 31 is set to the close position (the position indicated by the one-dot chain line in FIG. 1) by contracting the power cylinder 32.

  As the pallet detection sensor 21, for example, a sensor that detects the presence or absence of the pallet P based on whether or not the lock bar is pushed down by its own weight (see Japanese Patent No. 4222499) can be used. The configuration of the pallet detection sensor 21 is not particularly limited.

  FIG. 3 is a diagram showing the head guard 14, the power cylinder 32, the guard member 31, and the like. (A) is a top view, (B) is a rear view, and the configuration shown in (A) is viewed from the B direction. The configuration shown in (B) and (B) is from the A direction. (A) is seen.

  As shown in these drawings, a head guard 14 and a slide roof 30 are provided between the pair of left and right side frames 13R and 13L. The head guard 14 is attached to the inner walls of the side frames 13R and 13L by a fixing tool such as a bolt or welding. On the other hand, the slide roof 30 is guided by a guide rail 33R provided on the inner wall of the side frame 13R and a guide rail 33L provided on the inner wall of the side frame 13L, and can slide in the front-rear direction.

  A guard member 31 is attached to the rear end portion of the slide roof 30 by a fixture such as a bolt or welding. As shown in FIG. 3B, the guard member 31 includes a metal frame 31a and a light-transmitting flat plate (for example, an acrylic plate) 31b fitted in the opening of the frame 31a. ing. The reason why the guard member 31 is configured by the light-transmitting flat plate 31b is that when the guard member 31 is configured by an opaque member, it is difficult to grasp the surrounding state when performing the picking operation.

  An electric power cylinder 32 is provided between the head guard 14 and the slide roof 30. The power cylinder 32 includes a cylindrical case and a rod that can protrude from the case. The head side end (front end) of the case is fixed to the head guard 14, and the front end (rear end) of the rod is a slide roof 30. It is fixed to. Therefore, when the power cylinder 32 expands and contracts under the control of the control unit 40A, the slide roof 30 slides back and forth along the guide rails 33R and 33L, and the guard member 31 attached to the rear end of the slide roof 30 approaches. Move between position and separation position. That is, when the power cylinder 32 expands and contracts, the guard member 31 supported at the rear end of the power cylinder 32 via the slide roof 30 moves between the proximity position and the separation position.

  When the pallet P is not inserted into the fork 12, that is, when the position of the guard member 31 is the close position, the guard member 31 has a warm shape hanging from the rear end portion of the head guard 14 (FIG. 1). reference). For this reason, the operator who is going to perform the picking work can surely notice that the pallet P is not inserted because the guard member 31 is in front of him. On the other hand, when the pallet P is inserted into the fork 12, that is, when the position of the guard member 31 is a separated position, the guard member 31 is not in front of the operator who is performing the picking operation. The operator can know that the picking work on the pallet P is possible.

  In the present embodiment, since the rear end portion of the head guard 14 and the position of the rear end portion 11 of the step 10 are substantially aligned, the guard member 31 that is in the close position regulates the operator's movement and restricts the operator. It also plays a role of confinement on step 10. On the other hand, the guard member 31 in the separated position also serves to prevent the operator who is performing the picking operation on the pallet P from falling from behind.

  The expansion / contraction length of the power cylinder 32, that is, the distance between the guard member 31 at the close position and the guard member 31 at the separate position may be determined according to the length of the fork 12. Specifically, when the length of the fork 12 is L12, the expansion / contraction length L32 of the power cylinder 32 is preferably determined based on the expression “0.5 × L12 ≦ L32 ≦ L12”. This is because if L32> L12, the operator who performs the picking work easily falls from the rear side of the pallet P. Further, if L32 <0.5 × L12, picking work must be performed using only a narrow area on the pallet P, and workability is lowered.

  As described above, according to the picking lift 1A provided with the fall prevention device according to the present embodiment, the operator who performs the picking operation reliably confirms whether or not the pallet P is present depending on whether the guard member 31 is near or far away. To prevent the operator from falling.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 4 shows a picking lift 1B provided with the fall prevention device according to the second embodiment. In the picking lift 1B according to the present embodiment, the mast 3 is provided with a lift detection sensor 22 and is based on both the detection result of the pallet detection sensor 21 and the lift of the cab 4 detected by the lift detection sensor 22. Thus, the control unit 40B is different from the picking lift 1A according to the first embodiment in that the control unit 40B is configured to extend and contract the power cylinder 32 (see FIG. 5), but the other points are common to the picking lift 1A. ing.

  In the picking lift 1B according to the present embodiment, when the tip of the wire drawn from a pulley provided at the lower part of the outer mast constituting the mast 3 is connected to the top of the inner mast, the inner mast moves up and down with the cab 4 with respect to the outer mast. Accordingly, the pulley rotates, and the wire is drawn out or wound up. The lift height detection sensor 22 detects the lift height of the cab 4 by detecting the amount of rotation of the pulley.

  In high places where picking work is performed, it is essential to change the position of the guard member 31 depending on whether or not the fork 12 is inserted into the pallet P. However, in low places where the fall does not become a serious problem, Depending on whether or not the fork 12 is inserted into the pallet P, it may be preferable not to change the position of the guard member 31 uniformly.

  According to the picking lift 1B according to the present embodiment, the position of the guard member 31 is more flexibly controlled based on both the detection result of the pallet detection sensor 21 and the lift detected by the lift detection sensor 22. Is possible. Specifically, when the lift height of the cab 4 does not exceed a predetermined height, the position of the guard member 31 is always set to the proximity position or the separation position regardless of the detection result of the pallet detection sensor 21. Can be.

[Modification]
The embodiments of the fall prevention device and the picking lift according to the present invention have been described above, but the present invention is not limited to these configurations.

  For example, the guard member 31 can be replaced with an arbitrary one that can restrict the operator's backward movement to some extent and is easily visible to the operator.

  Moreover, the power cylinder 32 can be replaced with an arbitrary actuator that can place the guard member 31 in the separated position or the close position under the control of the control units 40A and 40B.

  Further, the elevation detection sensor 22 can be replaced with any sensor that can directly or indirectly detect the elevation of the cab 4.

1A, 1B Picking lift 2 Vehicle main body 3 Mast 4 Driver's cab 10 Step 11 (Step) rear end 12 Fork 13, 13R, 13L Side frame 14 Head guard 15 Operation panel 16 Key switch 17 Accelerator lever 18 Lift switch 19 Brake pedal 20 Guard 21 Pallet detection sensor 22 Lift height detection sensor 30 Slide roof 31 Guard member 31a Frame body 31b Flat plate 32 Power cylinders 33R, 33L Guide rails 40A, 40B Control unit

Claims (6)

In a picking lift comprising a step, a head guard that covers the overhead of an operator who has boarded the step, and a pair of forks extending rearward from a rear end portion of the step, the operator can move up and down. A fall prevention device for preventing the fall of
A guard member capable of taking a proximity position close to a rear end portion of the head guard and a separation position farther away from the rear end portion;
A pallet detection sensor that detects whether or not the fork is inserted into the pallet; and a control unit that controls the position of the guard member based on a detection result of the pallet detection sensor;
When the fork is inserted into the pallet, the control unit sets the position of the guard member as the separated position, and when the fork is not inserted into the pallet, the control unit changes the position of the guard member. A fall prevention device having the proximity position. A stretchable member that can be stretched in the front-rear direction, further comprising a front end fixed to the head guard, and a rear end protruding rearward from a rear end of the head guard;
The guard member is supported by the rear end of the elastic member,
The fall prevention device according to claim 1, wherein the control unit controls the position of the guard member by expanding and contracting the expansion and contraction member. Further comprising a lift detection sensor for detecting the lift of the cab,
The said control part controls the position of the said guard member based on the detection result of the said pallet detection sensor, and the said lifting height detected by the said lifting height detection sensor, It is characterized by the above-mentioned. Fall prevention device.   The fall-preventing device according to any one of claims 1 to 3, wherein the guard member comprises a light-transmitting flat plate.   5. The fall prevention device according to claim 4, wherein the guard member has a warm shape hanging from a rear end portion of the head guard at the proximity position.   A picking lift comprising the fall prevention device according to any one of claims 1 to 5.

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