JP2009113910A - Cargo handling vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cargo handling vehicle capable of preventing an operator from traveling the cargo handling vehicle or preventing a cargo handling device from performing a cargo handling work, in a state of no cylinder mounted at a regular cylinder mounting position. <P>SOLUTION: In a forklift mounted with the cylinder 22 filled with LPG, the cargo handling device for performing cargo handling and a mounting device for attachably/detachably mounting the cylinder 22 are provided in a vehicle body 23. The mounting device 28 has a frame 32 for holding the cylinder 22 and a fixing band 33 for fixing the cylinder 22 to the frame 32. The forklift is provided with a control device for allowing the forklift not to travel and allowing the cargo handling device not to operate when the frame 32 is switched to a cylinder replacing position B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cargo handling vehicle such as a forklift powered by a fuel gas such as LPG.

  Conventionally, as this type of cargo handling vehicle, for example, as shown in FIG. 9, there is a forklift 2 that operates with an LPG filled in the cylinder 1, and a mounting device that detachably mounts the cylinder 1 at the rear of the vehicle body 3. 4 is provided.

  As shown in FIG. 10, the mounting device 4 includes a fixed base 6 fixed to the vehicle body 3, a holding bracket 7 that is rotatably provided on the fixed base 6, and a cylinder that is provided on the holding bracket 7 so as to be openable and closable. And a fixing bracket 8 for fixing 1 to the holding bracket 7. The holding bracket 7 is set to the regular cylinder mounting position A and to the rear side of the regular cylinder mounting position A by rotating back and forth around the coupling pin 9 inserted in the left-right direction. It is configured to be switchable to the cylinder replacement position B.

  According to this, the cylinder 1 is mounted on the holding bracket 7, the fixing bracket 8 is closed and the cylinder 1 is fixed to the holding bracket 7, and the holding bracket 7 is mounted on the regular cylinder as shown by the solid line in FIG. In the state switched to the position A, the forklift 2 is run or the fork 11 is moved up and down to perform the cargo handling work. Thereby, the LPG in the cylinder 1 is supplied to the engine, and the forklift 2 is driven.

  Further, when replacing the cylinder 1, the traveling of the forklift 2 and the cargo handling work by the fork 11 and the like are stopped, and the holding bracket 7 is moved from the regular cylinder mounting position A to the cylinder as shown by the phantom line in FIG. Switch to exchange position B. Thereafter, as shown in FIG. 10B, the fixing bracket 8 is opened, the cylinder 1 is taken out from the holding bracket 7, and another new cylinder 1 is mounted on the holding bracket 7. Then, the fixing bracket 8 is closed and the other cylinder 1 is fixed to the holding bracket 7, and the holding bracket 7 is switched from the cylinder replacement position B to the regular cylinder mounting position A as shown by the solid line in FIG. . Thereby, the cylinder 1 is mounted at the regular cylinder mounting position A.

  When the cylinder 1 is replaced as described above, the cylinder 1 moves to the rear end of the vehicle body 3 by switching the holding bracket 7 to the cylinder replacement position B as shown in FIG. The replacement work can be performed from the rear side of the forklift 2, and the replacement work becomes easy.

Forklift 2 provided with mounting device 4 as described above is described in, for example, Patent Document 1 below.
JP-A-3-143735

  However, in the above conventional type, when the cylinder 1 is replaced, forgetting to return the holding bracket 7 from the cylinder replacement position B to the regular cylinder mounting position A, as shown by the phantom line in FIG. There is a problem that the forklift 2 is run while the bracket 7 is still switched to the cylinder replacement position B, or the cargo handling work is performed by the fork 11 or the like, and the running or cargo handling work in such a state is dangerous. May be accompanied.

  The present invention provides a cargo handling vehicle capable of preventing an operator from running a cargo handling vehicle or performing a cargo handling operation by a cargo handling device in a state where the cylinder is not mounted at a regular cylinder mounting position. The purpose is to do.

In order to achieve the above object, the first invention is a cargo handling vehicle equipped with a cylinder filled with fuel gas,
A mounting device for detachably mounting the cylinder is provided on the vehicle body,
When the cylinder is not mounted at the regular cylinder mounting position, control means for making the cargo handling vehicle unmovable is provided.

  According to this, when the cylinder is replaced, even if the operator tries to run the cargo handling vehicle in a state where the cylinder is not mounted at the regular cylinder mounting position, the control means disables the cargo handling vehicle. The cargo handling vehicle does not travel, so that safety during traveling of the cargo handling vehicle is maintained.

In the second aspect of the invention, the mounting device includes a gantry that holds the cylinder, and a fixing unit that fixes the bomb to the gantry.
The gantry is configured to be switched between a regular cylinder mounting position and a cylinder replacement position.
The control means disables the cargo handling vehicle from traveling when the gantry is switched to the cylinder replacement position.

  According to this, when replacing the cylinder, the operator forgets to return the gantry from the cylinder replacement position to the normal cylinder mounting position, and the operator runs the cargo handling vehicle with the cradle switched to the cylinder replacement position. Even so, since the control means makes the cargo handling vehicle impossible to travel, the cargo handling vehicle does not travel, and thus the safety during traveling of the cargo handling vehicle is maintained.

  When the operator returns the gantry from the cylinder replacement position to the regular cylinder mounting position, the cylinder is mounted at the regular cylinder mounting position, and the control means switches the cargo handling vehicle from the unmovable state to the travelable state. The operator can drive the cargo handling vehicle.

In the third aspect of the present invention, when the operator tries to run the cargo handling vehicle in a state where the cylinder is not mounted at the regular cylinder mounting position, the control unit issues a warning from the warning unit.
According to this, when the cylinder is replaced, even if the operator tries to run the cargo handling vehicle in a state where the cylinder is not mounted at the regular cylinder mounting position, the control means disables the cargo handling vehicle. Cargo handling vehicles do not travel. At this time, since the control means issues a warning from the warning means, the operator notices that the cylinder is not mounted at the regular cylinder mounting position quickly and reliably.

The fourth invention is a cargo handling vehicle equipped with a cylinder filled with fuel gas,
The vehicle body is provided with a cargo handling device that performs cargo handling and a mounting device that detachably mounts a cylinder,
Control means for disabling the cargo handling device when the cylinder is not mounted at the regular cylinder mounting position is provided.

  According to this, when the cylinder is replaced, even if the operator tries to operate the cargo handling device in a state where the cylinder is not mounted at the regular cylinder mounting position, the control means disables the cargo handling device. The cargo handling device does not operate, thereby maintaining safety during cargo handling operations of the cargo handling vehicle.

In the fifth aspect of the invention, the mounting device includes a gantry that holds the cylinder, and a fixing unit that fixes the bomb to the gantry.
The gantry is configured to be switched between a regular cylinder mounting position and a cylinder replacement position.
The control means disables the cargo handling device when the gantry is switched to the cylinder replacement position.

  According to this, when replacing the cylinder, the operator forgets to return the gantry from the cylinder replacement position to the normal cylinder mounting position, and the operator operates the cargo handling device with the gantry still switched to the cylinder replacement position. Even so, since the control means makes the cargo handling device inoperable, the cargo handling device does not operate, thereby maintaining safety during cargo handling work of the cargo handling vehicle.

  When the operator returns the gantry from the cylinder replacement position to the regular cylinder mounting position, the cylinder is mounted at the regular cylinder mounting position, and the control means switches the cargo handling device from the inoperable state to the operable state. The operator can activate the cargo handling device.

According to the sixth aspect of the present invention, when the operator tries to operate the cargo handling device in a state where the cylinder is not mounted at the regular cylinder mounting position, the control unit issues a warning from the warning unit.
According to this, when the cylinder is replaced, even if the operator tries to operate the cargo handling device in a state where the cylinder is not mounted at the regular cylinder mounting position, the control means disables the cargo handling device. The cargo handling device does not operate. At this time, since the control means issues a warning from the warning means, the operator notices that the cylinder is not mounted at the regular cylinder mounting position quickly and reliably.

This seventh invention is a cargo handling vehicle equipped with a cylinder filled with fuel gas,
The vehicle body is provided with a cargo handling device that performs cargo handling and a mounting device that detachably mounts a cylinder,
When the cylinder is not mounted at the regular cylinder mounting position, there is provided control means for disabling the cargo handling vehicle and disabling the cargo handling apparatus.

  According to this, when the cylinder is replaced, even if the operator tries to run the cargo handling vehicle or operate the cargo handling apparatus in a state where the cylinder is not mounted at the regular cylinder mounting position, Since the vehicle is disabled from traveling and the cargo handling device is disabled, the cargo handling vehicle does not travel and the cargo handling device does not operate. Thereby, the safety | security at the time of driving | running | working of a cargo handling vehicle and the safety | security at the time of cargo handling work are maintained.

In the eighth aspect of the invention, the mounting device includes a frame that holds the cylinder, and a fixing unit that fixes the cylinder to the frame.
The gantry is configured to be switched between a regular cylinder mounting position and a cylinder replacement position.
The control means disables the cargo handling vehicle and disables the cargo handling device when the gantry is switched to the cylinder replacement position.

  According to this, when replacing the cylinder, the operator forgets to return the gantry from the cylinder replacement position to the normal cylinder mounting position, and the operator runs the cargo handling vehicle with the cradle switched to the cylinder replacement position. Even if an attempt is made to operate the cargo handling device or the cargo handling device is attempted, the cargo handling vehicle does not travel and the cargo handling device does not operate because the control means disables the cargo handling vehicle and disables the cargo handling device. Thereby, the safety | security at the time of driving | running | working of a cargo handling vehicle and the safety | security at the time of cargo handling work are maintained.

  When the operator returns the gantry from the cylinder replacement position to the normal cylinder mounting position, the cylinder is mounted at the normal cylinder mounting position, and the control means switches the cargo handling vehicle from a state where it cannot travel to a state where it can travel. At the same time, the cargo handling device is switched from an inoperable state to an operable state. Thereby, the operator can drive | operate a cargo handling vehicle and can operate a cargo handling apparatus.

  According to the ninth aspect of the present invention, when the operator tries to run the cargo handling vehicle or activates the cargo handling device in a state where the cylinder is not mounted at the regular cylinder mounting position, the control means starts from the warning means. A warning is issued.

  According to this, when the cylinder is replaced, even if the operator tries to run the cargo handling vehicle or operate the cargo handling apparatus in a state where the cylinder is not mounted at the regular cylinder mounting position, Since the vehicle is disabled from traveling and the cargo handling device is disabled, the cargo handling vehicle does not travel and the cargo handling device does not operate. At this time, since the control means issues a warning from the warning means, the operator notices that the cylinder is not mounted at the regular cylinder mounting position quickly and reliably.

  The tenth aspect of the invention is provided with a switching position detecting device for detecting that the gantry is switched to the cylinder replacement position.

  According to the present invention, when the cylinder is replaced, even if the operator tries to run the cargo handling vehicle in a state where the cylinder is not mounted at the regular cylinder mounting position, the control means disables the cargo handling vehicle from running. The cargo handling vehicle does not travel, thereby maintaining the safety of the cargo handling vehicle during travel.

  In addition, when the cylinder is replaced, even if the operator tries to operate the cargo handling device when the cylinder is not mounted at the regular cylinder mounting position, the control means disables the cargo handling device. Does not operate, so that safety during cargo handling work of the cargo handling vehicle is maintained.

Embodiments of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, reference numeral 21 denotes a forklift that is an example of a cargo handling vehicle. The forklift 21 is configured to operate by LPG (an example of fuel gas) filled in a cylinder 22. A cargo handling device 24 that performs cargo handling is provided at the front of the vehicle body 23. The cargo handling device 24 includes a mast 25 that can expand and contract in the vertical direction, and a fork 26 that is provided on the mast 25 so as to be movable up and down. The mast 25 is tilted back and forth by a tilt hydraulic cylinder 80, and the fork 26 is moved up and down by a lift hydraulic cylinder 81. A cylinder mounting device 28 for detachably mounting the cylinder 22 is provided at the rear end of the vehicle body 23.

  As shown in FIGS. 2 to 4, the cylinder mounting device 28 includes a fixing base 31 fixed to the vehicle body 23, a base 32 that holds the cylinder 22, and a fixing band 33 (fixing means) that fixes the cylinder 22 to the base 32. Example). The fixed base 31 includes a bottom plate 31a and a pair of side plates 31b that rise from both left and right ends of the bottom plate 31a.

  The gantry 32 includes a pair of left and right side plates 32a and a plurality of connection frames 32b, 32c, and 32d connected between the pair of side plates 32a. The pair of side plates 32a is formed in an L shape having one and the other arms 32e and 32f, respectively.

  The gantry 32 is provided between a pair of side plates 31 b of the fixed base 31 by a pair of left and right support shafts 35, and is supported so as to be rotatable in the front-rear direction around the support shaft 35. One connection frame 32b is provided between the distal ends of one arm 32e, the other connection frame 32c is provided between the distal ends of the other arm 32f, and the intermediate connection frame 32d is one and the other arms 32e, 32f. Between the proximal ends of the two. A cylinder mounting portion 36 is formed between the one and the other connection frames 32b and 32c.

  By the rotation of the gantry 32, the gantry 32 has a regular cylinder mounting position A in which one arm 32e lies forward and the other arm 32f stands upward as shown by the solid line in FIG. As shown by an imaginary line in FIG. 2, one arm 32e stands up and can be switched to a cylinder replacement position B where the other arm 32f lies backward.

  The fixed band 33 includes two left and right (a plurality of) band main bodies 37, two left and right (a plurality of) connecting members 38 connected to one end of each band main body 37 and one connecting frame 32b, and each band main body. 37, a connecting plate 39 for connecting the other ends of 37, and a fixing lever 40 provided on the connecting plate 39. Each band body 37 is connected to each connecting member 38 so as to be rotatable in the front-rear direction. Further, the fixing lever 40 has a hook-shaped locking member 40a at its tip. The locking member 40a is detachable from a hook-shaped locked member 41 provided on the other connecting frame 32c.

  As shown in FIGS. 2 and 5, the fixing base 31 is provided with a fixing device 69 for fixing the gantry 32 at the regular cylinder mounting position A. The fixing device 69 is formed on the mounting bracket 70 provided on the left and right side plates 31 b of the fixing base 31, the fixing pin 71 provided on the mounting bracket 70, and the left and right side plates 32 a of the gantry 32. A pin hole 73.

  As shown by the solid line in FIG. 2, when the gantry 32 is switched to the regular cylinder mounting position A, the position of the pin hole 73 coincides with the position of the fixing pin 71. The fixing pin 71 moves in the left-right direction and can be inserted into and removed from the pin hole 73. An operation handle 74 is provided at the outer end of the fixing pin 71. Further, a coil spring 75 (an example of an urging means) that urges the fixing pin 71 with respect to the pin hole 73 in the insertion direction C is provided by being fitted around the fixing pin 71. In addition, a regulation pin 76 that regulates the amount of movement in the insertion direction C and the removal direction D of the fixing pin 71 with respect to the pin hole 73 is provided at the inner end portion of the fixing pin 71.

  As shown in FIGS. 2 and 6, a switching position detection limit switch 78 (an example of a switching position detection device) is provided on one side plate 31 b of the fixed base 31. The limit switch 78 for detecting the switching position has a switching movable shaft 78a that is freely retractable and urged in the protruding direction E (ON direction), and the gantry 32 is switched to the regular cylinder mounting position A. 2 (see the solid line in FIG. 2 and the phantom line in FIG. 6), and turns off when the gantry 32 is in a position other than the regular cylinder mounting position A (see the phantom line in FIG. 2 and the solid line in FIG. 6). A roller 78b is provided at the tip of the switching movable shaft 78a. The switching movable shaft 78a passes through the hole 82 formed in the one side plate 31b from the outside to the inside, and the roller 78b is positioned between the one side plate 31b of the fixed base 31 and the one side plate 32a of the mount 32.

  A protrusion 79 is provided on one side plate 32a of the gantry 32. When the gantry 32 is switched to the cylinder replacement position B as shown by the phantom line in FIG. 2 and the solid line in FIG. Since the switching movable shaft 78a is pushed in contact with the roller 78b, the switching movable shaft 78a retracts and the switching position detection limit switch 78 is switched off. Further, as shown by the solid line in FIG. 2 and the phantom line in FIG. 6, when the gantry 32 is switched to the regular cylinder mounting position A, the projection 79 is separated from the roller 78b, and the switching movable shaft 78a protrudes, The switching position detection limit switch 78 is turned on.

  As shown in FIG. 1, the vehicle body 23 has a driving operation unit 29 between the mast 25 and the cylinder mounting device 28. The driving operation unit 29 includes a driving seat 30, a parking brake 44, a travel switching lever 45 that switches between forward travel and reverse travel of the forklift 21, a tilt operation lever 46 that switches the inclination of the mast 25, and a lift of the fork 26. A lift operation lever 47 for switching between a descent and a descent, an alarm device 48 (an example of a warning means) including a buzzer for outputting a warning sound, a warning light 49 (an example of a warning means), and on / off by operating keys. Is provided with a starter switch 50 or the like.

  The driver seat 30 has a seat switch 51 (such as a limit switch) that is switched on when the operator is seated and switched off when the operator leaves the seat. The parking brake 44 has a parking brake switch 52 (such as a limit switch) that is turned on when the brake is operated and turned off when the brake is not operated.

  As shown in FIG. 7, the vehicle body 23 includes a traveling electromagnetic valve 54 that switches between forward traveling and reverse traveling by switching a traveling clutch, a traveling operation circuit 55 that operates the traveling electromagnetic valve 54, and A tilt solenoid valve 56 that switches the inclination of the mast 25 by switching the piston rod of the tilt hydraulic cylinder 80, a tilt operation circuit 57 that operates the tilt solenoid valve 56, and a piston of the lift hydraulic cylinder 81 There is provided a lift electromagnetic valve 58 for switching raising and lowering of the fork 26 by switching the rod withdrawal, a lift operation circuit 59 for operating the lift electromagnetic valve 58, and a control device 63 (an example of control means). Yes.

  The travel operation circuit 55 is interlocked with the travel switching lever 45 to switch between a forward travel switching position (A), a reverse travel switching position (B), and a neutral position (C), and a forward travel switching. It has a contact 60b at the position (A) and a contact 60c at the reverse travel switching position (B). Both the contacts 60b and 60c are connected to the terminals of the traveling electromagnetic valve 54, respectively.

  One interlocking switch 64 a is provided between the one contact 60 b and the terminal of the traveling electromagnetic valve 54, and the other interlock is disposed between the other contact 60 c and the terminal of the traveling electromagnetic valve 54. Switch 64b is provided.

  The tilt actuating circuit 57 is interlocked with the tilt operating lever 46 and can be switched between a forward tilt switching position (A), a rear tilt switching position (B) and a neutral position (C), and a forward tilt switching switch 61a. A contact 61b at the position (A) and a contact 61c at the rearward tilt switching position (B) are provided. Both the contacts 61b and 61c are connected to terminals of the tilting electromagnetic valve 56, respectively.

  One interlocking switch 65 a is provided between the one contact 61 b and the terminal of the tilt electromagnetic valve 56, and the other interlock is provided between the other contact 61 c and the terminal of the tilting electromagnetic valve 56. Switch 65b is provided.

  The lift operation circuit 59 includes a lift changeover switch 62a that can be switched to an ascending changeover position (b), a descent changeover position (b), and a neutral position (c) in conjunction with the lift operation lever 47, and an ascending changeover position (a ) Contact 62b and a lowering switch position (b) contact 62c. Both the contacts 62b and 62c are connected to terminals of the lift electromagnetic valve 58, respectively.

  One interlock switch 66a is provided between the one contact 62b and the terminal of the lift electromagnetic valve 58, and the other interlock is provided between the other contact 62c and the terminal of the lift electromagnetic valve 58. A switch 66b is provided.

  Further, the control device 63 switches the operation and non-operation of the alarm device 48 based on the input signals from the starter switch 50, the seat switch 51, the parking brake switch 52, and the switching position detection limit switch 78, and a warning light. The switching of 49 is switched on and off, and the on / off switching of the interlock switches 64a to 66a and 64b to 66b is controlled.

Hereinafter, the operation of the above configuration will be described.
As shown by the solid line in FIG. 1 and the solid line in FIG. 2, the cylinder 22 is mounted on the cylinder mounting portion 36 of the gantry 32 fixed at the regular cylinder mounting position A by the fixing device 69 and fixed by the fixing band 33. ing.

First, the procedure for replacing the cylinder 22 will be described.
First, as shown by the phantom lines in FIG. 5, the handle 74 of the fixing device 69 is pulled forward, and the fixing pin 71 is removed from the pin hole 73, thereby releasing the fixation of the gantry 32. Next, as shown by a virtual line in FIG. 1 and a virtual line in FIG. 2, the gantry 32 is rotated from the regular cylinder mounting position A to the cylinder replacement position B. Thereafter, the locking member 40a of the fixing lever 40 is detached from the locked member 41, and both the band main bodies 37 are rotated to open the cylinder mounting portion 36. Then, the used cylinder 22 is removed from the cylinder mounting portion 36, and a new cylinder 22 is mounted on the cylinder mounting portion 36.

  Next, both the band main bodies 37 are rotated to close the cylinder mounting portion 36, and the locking member 40 a of the fixing lever 40 is engaged with the locked member 41, thereby fixing the cylinder 22 with the fixing band 33. . Thereafter, as shown by the solid line in FIG. 1 and the solid line in FIG. 2, the gantry 32 is rotated from the cylinder replacement position B to the regular cylinder mounting position A, and the fixing pin 71 is moved into the pin hole as shown by the solid line in FIG. 73, and the gantry 32 is fixed to the regular cylinder mounting position A.

  As indicated by the phantom line in FIG. 1, the cylinder 22 can be attached and detached from the rear side of the vehicle body 23 by switching the gantry 32 to the cylinder replacement position B, so that the attachment / detachment work can be easily performed.

Next, the control by the control device 63 will be described with reference to the flowchart of FIG.
First, it is determined whether the starter switch 50 is on or off (step -1). When the starter switch 50 is switched off and the engine of the forklift 21 is stopped, it is determined whether the parking brake switch 52 is on or off ( Step-2). If the parking brake 44 is not activated, the parking brake switch 52 is turned off, the alarm device 48 is activated to generate a warning sound, and the warning lamp 49 is turned on (step-3). Thereby, when the forklift 21 is parked, it is possible to prevent the operator from forgetting to operate the parking brake 44.

Further, the interlock switches 64a to 66a and 64b to 66b are turned off (step-4).
In Step-2, if the parking brake 44 is activated, the parking brake switch 52 is turned on, the operation of the alarm device 48 is stopped and the warning light 49 is turned off (Step-5). The lock switches 64a to 66a and 64b to 66b are turned on (step-6).

  Further, when the operator turns on the starter switch 50 and the engine of the forklift 21 is driven in step-1 above, it is determined whether the parking brake switch 52 is on or off (step-7), and the parking brake 44 is turned on. If is not activated, the parking brake switch 52 is turned off.

  Next, it is determined whether the seat switch 51 is on or off (step-8). If the operator is not seated in the driver's seat 30, the seat switch 51 is turned off and the alarm device 48 is activated to generate a warning sound. At the same time, the warning lamp 49 is turned on (step-9). Accordingly, it is possible to prevent the operator from leaving the driver seat 30 without operating the parking brake 44 when the engine of the forklift 21 is driven.

Further, the interlock switches 64a to 66a and 64b to 66b are turned off (step -10).
In Step-7, if the parking brake 44 is activated, the parking brake switch 52 is turned on, the operation of the alarm device 48 is stopped and the warning light 49 is turned off (Step-11). The lock switches 64a to 66a and 64b to 66b are turned on (step -12).

  In Step-8, if the operator is seated in the driver's seat 30, the seat switch 51 is turned on, and then it is determined whether the switching position detection limit switch 78 is on or off (Step-13). ). When the gantry 32 is not switched to the regular cylinder mounting position A, the switching position detection limit switch 78 is turned off, and it is determined that the cylinder 22 is not mounted to the regular cylinder mounting position A, and the alarm device 48 To generate a warning sound and turn on the warning lamp 49 (step-9). As a result, the operator notices that the cylinder 22 is not mounted at the regular cylinder mounting position A, and can respond quickly.

Further, the interlock switches 64a to 66a and 64b to 66b are turned off (step -10).
In step-13, when the gantry 32 is switched to the regular cylinder mounting position A, the switching position detection limit switch 78 is turned on, and the cylinder 22 is mounted to the regular cylinder mounting position A. Thus, the operation of the alarm device 48 is stopped and the warning lamp 49 is turned off (step 11), and the interlock switches 64a to 66a and 64b to 66b are turned on (step -12).

  Since the interlock switches 64a to 66a and 64b to 66b are switched on in the above step-6 and step-12, as shown in FIG. 7, the operator moves the travel switching lever 45 to the forward travel switching position. When the switching operation is performed, the traveling switch 60a is connected to one contact 60b, the traveling electromagnetic valve 54 is operated, the traveling clutch is switched, and the forklift 21 can be moved forward. Similarly, when the operator switches the travel switching lever 45 to the reverse travel switching position, the travel switch 60a is connected to the other contact 60c, and the forklift 21 can travel backward.

  When the operator switches the tilt operation lever 46 to the forward tilt switching position, the tilt switch 61a is connected to one contact 61b, the tilt electromagnetic valve 56 is activated, and the piston rod of the tilt hydraulic cylinder 80 is operated. Can be extended and the mast 25 can be tilted forward. Similarly, when the operator switches the tilt operation lever 46 to the backward tilt switching position, the tilt switch 61a is connected to the other contact 61c, the piston rod of the tilt hydraulic cylinder 80 is shortened, and the mast 25 is tilted backward. Can be made.

  Further, when the operator switches the lift operation lever 47 to the lift switching position, the lift switch 62a is connected to one contact 62b, the lift electromagnetic valve 58 is activated, and the piston rod of the lift hydraulic cylinder 81 is moved. The fork 26 can be raised by extending. Similarly, when the operator switches the lift operation lever 47 to the lowering switching position, the lift switching switch 62a is connected to the other contact 62c, the piston rod of the lifting hydraulic cylinder 81 is shortened, and the fork 26 is lowered. Can do.

  Thereby, in step-6 and step-12, by operating the levers 45 to 47, the forklift 21 can be run, the mast 25 can be tilted, and the fork 26 can be raised and lowered.

  Further, in steps -4 and -10, as shown in FIG. 7, the interlock switches 64a to 66a and 64b to 66b are turned off, so that the operator operates the travel switching lever 45. Even when the travel changeover switch 60a is switched to either one of the two contacts 60b and 60c, the travel electromagnetic valve 54 does not operate because both the interlock switches 64a and 64b are off. As a result, even if the operator operates and switches the travel switching lever 45, the travel clutch does not operate and the forklift 21 does not travel (that is, travel becomes impossible).

  Similarly, even if the operator operates the tilt operation lever 46 and the tilt changeover switch 61a is switched to either one of the two contacts 61b and 61c, both the interlock switches 65a and 65b are off. The electromagnetic valve 56 does not operate. As a result, even if the operator operates and switches the tilt operation lever 46, the tilt hydraulic cylinder 80 does not operate and the mast 25 does not tilt (i.e., becomes inoperable).

  Further, even if the operator operates the lift operation lever 47 and the lift changeover switch 62a is switched to either one of the two contacts 62b and 62c, both interlock switches 66a and 66b are off. Valve 58 does not operate. Thereby, even if the operator operates the lift operation lever 47 to switch, the lift hydraulic cylinder 81 does not operate and the fork 26 does not move up and down (that is, cannot be operated).

  Thereby, in step-4 and step-10, even if each lever 45-47 is operated, running of the forklift 21, tilting of the mast 25, and raising / lowering of the fork 26 become impossible.

  Therefore, when the cylinder 22 is replaced, the operator forgets to return the gantry 32 from the cylinder replacement position B to the regular cylinder mounting position A, and the operator can Even if the levers 45 to 47 are operated to move the forklift 21 or the mast 25 is tilted or the fork 26 is moved up and down, the forklift 21 does not move, the mast 25 does not tilt, and the fork 26 does not move up and down. . Thereby, the safety | security at the time of driving | running | working of the forklift 21 and the safety | security at the time of cargo handling work are maintained.

  In the above embodiment, as shown in FIG. 7, the tilt operation circuit 57 and the lift operation circuit 59 are provided with interlock switches 65a, 66a, 65b, 66b. Interlock switches 65a and 65b or interlock switches 66a and 66b may be provided only in one of the operation circuits 59.

  In the above embodiment, the interlocking switches 64a to 66a and 64b to 66b are provided in the travel operation circuit 55, the tilt operation circuit 57, and the lift operation circuit 59. The locking switches 64a and 64b may be provided, and the tilting operation circuit 57 and the lift operation circuit 59 may not be provided with the interlock switches 65a, 66a, 65b and 66b. According to this, when the cylinder 22 is not mounted at the regular cylinder mounting position A, only the traveling of the forklift 21 becomes impossible.

  Further, the interlocking switches 64a and 64b may not be provided in the traveling operation circuit 55, and the interlocking switches 65a, 66a, 65b, and 66b may be provided in the tilting operation circuit 57 and the lift operation circuit 59. According to this, when the cylinder 22 is not mounted at the regular cylinder mounting position A, it is impossible to tilt the mast 25 and raise and lower the fork 26.

  In the above embodiment, the cargo handling device 24 is configured by the mast 25 and the fork 26, but is not limited to this configuration, and an attachment other than the fork 26 may be provided.

  In the above embodiment, the alarm device 48 and the warning lamp 49 are provided as an example of the warning means, but only one of them may be provided. In addition, the alarm device 48 is configured by a buzzer that outputs a warning sound, but may output a warning to warn.

In the above embodiment, the forklift 21 is described as an example of a cargo handling vehicle. However, the forklift 21 is not limited to the forklift 21 and may be a wheel loader, for example.
In the above embodiment, the cylinder 22 filled with LPG is used as an example of the fuel gas, but a gas other than LPG may be used.

It is a side view of a forklift in an embodiment of the invention. It is a side view of the cylinder mounting apparatus of a forklift. It is a partially cutaway rear view of the cylinder mounting apparatus of a forklift. FIG. 3 is an XX arrow view in FIG. 2. It is a longitudinal cross-sectional view of the fixing device of the cylinder mounting device of a forklift. It is a longitudinal cross-sectional view which shows the structure of the attachment part of the limit switch for switching position detection of the cylinder mounting apparatus of a forklift. FIG. 2 is a schematic diagram (block diagram) showing the configuration of the control system of the forklift. 4 is a flowchart for explaining control by the forklift control device. It is a perspective view of the conventional forklift. It is a side view of the mounting apparatus of the cylinder of a forklift.

Explanation of symbols

21 Forklift (loading vehicle)
22 Cylinder 23 Car body 24 Cargo handling device 28 Cylinder mounting device 32 Mounting base 33 Fixing band (fixing means)
48 Alarm (Warning means)
49 Warning light (Warning means)
63 Control device (control means)
78 Limit switch for switching position detection (switching position detection device)
A Regular cylinder mounting position B Cylinder replacement position

Claims (10)

A cargo handling vehicle equipped with a cylinder filled with fuel gas,
A mounting device for detachably mounting the cylinder is provided on the vehicle body,
A cargo handling vehicle, characterized in that a control means is provided for disabling the cargo handling vehicle when the cylinder is not mounted at a regular cylinder mounting position. The mounting device has a gantry for holding the cylinder and a fixing means for fixing the bomb to the gantry.
The gantry is configured to be switched between a regular cylinder mounting position and a cylinder replacement position.
2. The cargo handling vehicle according to claim 1, wherein the control means makes the cargo handling vehicle unmovable when the gantry is switched to the cylinder replacement position. The control means issues a warning from the warning means when the operator tries to run the cargo handling vehicle in a state where the cylinder is not mounted at the regular cylinder mounting position. Cargo handling vehicle. A cargo handling vehicle equipped with a cylinder filled with fuel gas,
The vehicle body is provided with a cargo handling device that performs cargo handling and a mounting device that detachably mounts a cylinder,
A cargo handling vehicle characterized by comprising control means for disabling the cargo handling device when the cylinder is not mounted at a regular cylinder mounting position. The mounting device has a gantry for holding the cylinder and a fixing means for fixing the bomb to the gantry.
The gantry is configured to be switched between a regular cylinder mounting position and a cylinder replacement position.
5. The cargo handling vehicle according to claim 4, wherein the control means disables the cargo handling device when the gantry is switched to the cylinder replacement position. The control means issues a warning from the warning means when the operator tries to operate the cargo handling device in a state where the cylinder is not mounted at the regular cylinder mounting position. Cargo handling vehicle. A cargo handling vehicle equipped with a cylinder filled with fuel gas,
The vehicle body is provided with a cargo handling device that performs cargo handling and a mounting device that detachably mounts a cylinder,
A cargo handling vehicle characterized by comprising control means for disabling the cargo handling vehicle and disabling the cargo handling device when the cylinder is not mounted at a regular cylinder mounting position. The mounting device has a gantry for holding the cylinder and a fixing means for fixing the bomb to the gantry.
The gantry is configured to be switched between a regular cylinder mounting position and a cylinder replacement position.
8. The cargo handling vehicle according to claim 7, wherein the control means disables the cargo handling vehicle and disables the cargo handling device when the gantry is switched to the cylinder replacement position. The control means issues a warning from the warning means when the operator tries to run the cargo handling vehicle or activates the cargo handling equipment in a state where the cylinder is not mounted at the regular cylinder mounting position. The cargo handling vehicle according to claim 7 or 8. The cargo handling vehicle according to claim 2, 5 or 8, further comprising a switching position detecting device for detecting that the gantry is switched to the cylinder replacement position.

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