JP2006001421A - Anti-theft device of working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively make an anti-theft device for preventing theft of a working vehicle by enabling input of secret data with the aid of the existing means of operation. <P>SOLUTION: When the working vehicle is stored in a state that an outrigger device 4 is jacked up, the operating conditions of the means 29, 30, 31, 32 operated at the time of turning off a power switch 35 are stored in an operating condition storing means 38 as secret data. Then the operating conditions of the means 29, 30, 31, 32 operated at the time of turning on the power switch 35 when the working vehicle is brought into operation are verified against the secret data stored in the operating condition storing means 38. When data at the time of turning on is found to be same as the secret data by the check, a valve-switching signal for switching an unload valve 23 to the on-load condition is output. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a work vehicle antitheft device including an outrigger device such as a crane truck or an aerial work vehicle.

In recent years, there has been an increase in theft cases where work vehicles such as crane trucks and aerial work vehicles are stolen while they are stored at night parking lots, and as a countermeasure for this, anti-theft devices have been attached to work vehicles. Yes. As a theft prevention device attached to this type of work vehicle, a security code input means (keyboard or the like) for inputting a security code is attached to the work vehicle, and the number entered by the operator using the security code input means is registered in advance. If the collation result is the same, the operation of the work vehicle is permitted, and if the collation result is different, the operation is disabled, and theft by a third party who does not know the personal identification number is prevented (for example, , See Patent Document 1). In addition, when an anti-theft switch is operated on the work vehicle, an unload valve is installed to unload the hydraulic circuit for driving the work machine, and when the work vehicle is stored, the unload valve is operated to start the work. In some cases, the unloading state is canceled to prevent theft by a third party who does not know the mounting position of the antitheft switch. (For example, refer to Patent Document 2).
JP-A-9-50584 JP 2003-261006 A

  However, the former anti-theft device needs to have a security code input means for inputting the security code to the work vehicle and a release means when the security code is forgotten, and the anti-theft device is complicated and expensive. was there. In addition, the latter anti-theft device has a problem that it can be easily released when a third party knows the mounting position of the anti-theft switch.

  The present invention has been made in view of the above problems, and it is not necessary to attach an additional device such as a password input means, and can be configured at low cost by using an existing device installed in a work vehicle. An object of the present invention is to provide a highly reliable anti-theft device for a work vehicle that is difficult to release fraud by three parties.

  The present invention has the following configuration as means for solving the above problems.

  In other words, the antitheft device for a work vehicle according to the present invention is directed to an antitheft device for a work vehicle in which an outrigger device that supports the vehicle in an unmovable state in a jack-up state at a position behind the cab of the vehicle and a work machine. Yes.

  The anti-theft device of the present invention is provided with a remote operation device equipped with a plurality of operation means for driving the work implement and a power switch, at least a hydraulic circuit for driving the outrigger device, and switching operation to an unload state. An unloading valve that opens the driving oil to the tank and disables the driving of the outrigger device, and an operation state storage that stores the operation state of the operating means that is operated when the power switch of the remote control device is turned off. And the controller, the controller operates the operation state of the operation means operated at the time when the power switch is turned off when the outrigger device is jacked up and the work vehicle is stored as the secret data. It is stored in the state storage means and is operated when the power switch is turned on when putting the work vehicle into operation. The operation state of the operating means and the password data stored in the operation state storage means are collated, and if the collation results are the same, a valve switching signal for switching the unload valve to the on-load state is output. It is configured as follows.

  According to the antitheft device configured as described above, when the work is finished and the work vehicle is stored in a parking lot or the like where there is a risk of theft, the outrigger device is first jacked up so that the vehicle cannot run (wheels Is in a state where it cannot float and steer / run. Next, the operation means of the remote control device may be operated differently from the normal operation, for example, the operation means may be operated to the “right turn” and “boom lying down” sides to turn off the power switch. As a result, the controller enters the anti-theft mode, and a signal corresponding to the operation state of the operation means (in this case, “right turn” and “boom collapse”) at the time when the power switch is turned off is the operation state storage means. After being output and stored (registered), the main power of the controller is cut off and the operation is terminated (registration data registration).

  Next, to move the work vehicle to another work site or the like in order to resume work, or to put the work vehicle into an operating state, the operation means is operated in the same manner as when the power switch is turned off (in this case, “turn right” ”And“ Boom fall down ”) and turn on the power switch. Thus, the controller starts the work vehicle as follows in accordance with the start procedure in the anti-theft mode. That is, the controller operates the operating means when the power switch is turned on (in this case, “right turn” and “boom collapse”), and the power switch off operation time stored in the operating state storage means. The operation state of the operating means (in this case, “turn right” and “boom collapse”) is verified, and if the comparison results are the same, a valve switching signal for switching the unloading valve to the on-load state is provided. The outrigger device and the work machine can be driven by outputting. If they are different from each other, the unloading valve is kept switched to the unloading state so that the outrigger device and the work machine cannot be driven. In this case, since the collation result is “same”, the controller outputs a valve switching signal for switching the unload valve to the on-load state and switches the valve to the on-load state. This makes it possible to resume driving. For this reason, if the outrigger device is stored, the work vehicle can be returned to a state where it can run, and the work vehicle can be moved and moved, and the work machine can be driven to resume the work (worker). Work resumption control).

  On the other hand, if a third party who does not know the PIN code operates the power switch of the remote control device on as usual (without operating any operation means), the controller will turn on the power switch according to the startup procedure in the anti-theft mode. The operation state of the operation means at this time (in this case “no operation”) and the operation state of the operation means at the time of the power switch OFF operation stored in the operation state storage means (in this case “turn right” ”And“ Boom lodging ”). In this case, since the collation result is“ different ”, the controller outputs a valve switching signal for maintaining the unload valve in the unload state, and the valve is unloaded. It is supposed to hold on. For this reason, the storing operation of the outrigger device and the resumption of driving of the work machine become impossible, and the work vehicle can be prevented from being stolen by a third party (theft prevention control by a third party).

  Further, when the work vehicle is stored in a managed parking lot or the like where there is no fear of theft, the power switch may be turned off as usual at the end of the work (without operating any operation means). In this case, since “no operation” is stored (registered) in the operation state storage means, when the worker resumes the operation, the power switch is operated as usual (no operation) without operating the operation means. Can be operated on. As a result, the work can be resumed by the same operation as before.

  Note that the password data in this anti-theft device, that is, the operating state of the operating means at the time of turning off the power switch is not limited to the combination of the two illustrated operations, and it is difficult for a third party to decipher and work. If the combination is easy for the user to remember, a single operation (for example, “boom reduction” operation only) or a combination of three or more operations (for example, “right turn”, “boom collapse”, “boom reduction”, etc.) Operation). For this reason, a relatively large number of combinations of password data can be set, and even if a third party tries to change the combinations in order and release them, it takes time and a high anti-theft effect can be obtained. In addition, since it is easy to change the registration of the password data, if the password data is changed periodically, the risk that the third person can decrypt the password data by looking at the operation state of the operator is reduced, and higher. An anti-theft effect can be obtained.

  The work vehicle anti-theft device configured as described above can input password data using the existing operation means equipped on the work vehicle, so there is no need to separately install a password number input means. In addition to being simple and inexpensive, it is possible to obtain a highly reliable antitheft device for a work vehicle in which a relatively large number of combinations of password data can be set and unauthorized removal by a third party is difficult.

  Hereinafter, with regard to a preferred embodiment of the present invention, a theft that can be installed in a crane-mounted work vehicle configured to load and unload a load on a load carrier by mounting a small crane between a truck cab and a load carrier. The prevention device will be described as an example with reference to FIGS. The anti-theft device of the present invention can be applied to a work vehicle such as an aerial work vehicle equipped with an outrigger device capable of supporting a truck unmovably in a jack-up state or a work vehicle such as a wheel crane in addition to the illustrated crane-mounted work vehicle. It can be equipped as well.

  In FIG. 1, A is a crane-mounted work vehicle in which a small crane 5 having outrigger devices 4, 4 is mounted on a chassis frame 1 a located between a cab 2 and a loading platform 3 of a truck 1. The small crane 5 in the work vehicle A includes a crane base 6 provided with outrigger devices 4 and 4 that can be installed to extend left and right, and a swing post 8 that is pivotably mounted on the crane base 6 by a swing motor 7. A telescopic boom 10 which is pivotally supported by a hoisting cylinder 9 on the upper part of the swivel post 8 and is slidably inserted into the base end boom 101, and the telescopic boom 10 in the telescopic boom 10 The hoisting wire rope 13 is hoisted by the telescopic cylinder 11, the swivel post 8 or the proximal boom 101 attached to the proximal boom 101, and the winch motor 12 attached to the proximal boom 101. The winch device 14 is driven to be lowered, and the hook block 15 is suspended from the telescopic boom tip 10a by the wire rope 13.

  The outrigger devices 4, 4 include an outer cylinder 4 a attached to the crane base 6, left and right inner cylinders 4 b, 4 b that are fitted so as to extend laterally from both ends of the outer cylinder 4 a, The right and left jacks 4c and 4c are fixedly attached to the front ends of the inner cylinders 4b and 4b. The outrigger devices 4 and 4 configured as described above are configured so that the jacks 4c and 4c and the rear wheels 1b and 1b are provided by extending the left and right inner cylinders 4b and 4b to the side of the vehicle to bring the jacks 4c and 4c into a jack-up state. The work vehicle is stably supported, and crane work is possible (as shown in FIG. 1 with a chain line). Further, if the jacks 4c, 4c and the left and right inner cylinders 4b, 4b are stored, the work vehicle is ready to travel and can be moved to the work site or the like. The outrigger devices 4 and 4 are incapable of traveling due to the front wheels 1c and 1c rising if the left and right jacks 4c and 4c are jacked up when the work vehicle is stored in a parking lot or the like. Therefore, it is possible to obtain a great prevention effect against vehicle theft in which the engine of the work vehicle is started by unauthorized means to steal the work vehicle.

  Next, the work vehicle drive circuit of FIG. 2 will be described. Reference numeral 17 denotes a swing control valve composed of an electromagnetic three-position switching valve. The hydraulic oil discharged by the hydraulic pump P by the switching operation to the right swing position is supplied to and discharged from the swing motor 7 to rotate the swing post 8 to the right. By rotating and turning to the left turning position, the hydraulic oil is supplied to and discharged from the turning motor 7 to turn the turning post 8 to the left. Similarly, 18 is a raising / lowering control valve constituted by an electromagnetic three-position switching valve. By switching to the raising / lowering position, the hydraulic oil is supplied to and discharged from the raising / lowering cylinder 9 to raise and lower the telescopic boom 10, and the lying position The hydraulic oil is supplied to and discharged from the hoisting cylinder 9 by the switching operation to turn the telescopic boom 10 down. Similarly, 19 is an expansion / contraction control valve composed of an electromagnetic three-position switching valve. By switching to the extension position, pressure oil is supplied to and discharged from the expansion / contraction cylinder 11 to extend the extension boom 10 and to the contraction position. The telescopic boom 10 is contracted by supplying and discharging pressure oil to the telescopic cylinder 11 by a switching operation. Similarly, 20 is a winch control valve composed of an electromagnetic three-position switching valve. By switching to the hoisting position, pressure oil is supplied to and discharged from the winch motor 12 and the hook block 15 is hoisted to drive the lowering position. The pressure oil is supplied to and discharged from the winch motor 12 by the switching operation to turn the hook block 15 down.

  In addition, 21 is an outrigger control valve composed of a manually operated three-position switching valve. When switching to the extended position, pressure oil is supplied to and discharged from the left and right jacks 4c and 4c (jack cylinders 22 and 22). The car is jacked up, and the left and right jacks 4c, 4c are supplied and discharged by the switching operation to the storage position to drive the storage.

  Reference numeral 23 denotes a main relief valve interposed in the discharge oil passage 24 of the hydraulic pump P. A pilot relief valve 23b and an unloading opening / closing valve 26 are interposed in parallel in the vent circuit 23a of the main relief valve 23. Yes. For this reason, if the opening / closing valve 26 is opened in the non-excited state, the set pressure of the main relief valve 23 becomes the tank pressure and becomes an unloaded state, and if it is closed in the excited state, the set pressure of the main relief valve 23 is set. Becomes a high pressure that is the set pressure of the pilot relief valve 23b, and the vehicle enters an on-road state. Therefore, the main relief valve 23 is switched between the unloading state and the onloading state by opening / closing the unloading on / off valve 26, and the unloading valve 26 according to claim 1 cooperates with the unloading on / off valve 26. It constitutes. When the unloading on / off valve 26 is configured to be closed in a non-excited state, the main relief valve 23 is switched to the onloading state when a third party disconnects the excitation circuit of the unloading on / off valve 26. Since the work vehicle is in a state where it can be freely operated, it is preferable to use the valve so that the main relief valve 23 is unloaded by opening the valve in a non-excited state. In addition, the crane is equipped with an overwinding prevention device that prevents the hook block 15 from being rolled up beyond the overwinding state (winding upper limit position). In the case where the unloading valve is provided as an operation stopping means for stopping the operation, the unloading valve can be used with assistance. In this case, it is not necessary to prepare a new unloading valve, and it can be configured at a lower cost.

  28 is a wired or wireless remote control device. On the operation panel 28a of the remote control device 28, the swing control means 29 for switching the swing control valve 17 to the right or left turn position, and the undulation for switching the lift control valve 18 to the raising or lowering position are provided. The operation means 30, the expansion / contraction operation means 31 for switching the expansion / contraction control valve 19 to the expansion / contraction position, and the winch operation means 32 for switching the winch control valve 20 to the winding / lowering position are respectively attached. . Further, a common speed instruction lever 33 for instructing each drive speed of turning, undulation, expansion / contraction, and winch is attached to the grip back surface 28b. Then, the remote control device 28 is based on the valve selection signal from each operation means 29, 30, 31, 32 and the speed command signal from the common speed instruction lever 33, and the control valve 17, corresponding to the operated operation means, An operation signal for switching 18, 19, and 20 to a valve switching amount corresponding to the operation amount of the speed instruction lever 33 is generated and transmitted to the controller 36 described later. Therefore, if the operator switches the operating means 29, 30, 31, 32 of the remote control device 28 to the direction in which he / she wants to drive and operates the common speed indicating lever 33 to indicate the driving speed, the corresponding operation signal is sent to the controller 36. The work machine is driven by the output. In this embodiment, a remote operation device having a plurality of operation means for instructing the switching direction of the valve and a common speed instruction lever for instructing the driving speed has been described as an example. You may comprise the potentiometer type operation means etc. which the corresponding valve switching signal is output. Further, the operation of the outrigger device or the like capable of switching the control valve by binary control (on / off) may be constituted by a switch type operation means for instructing only the valve switching direction. In this case, a common speed instruction lever is not required. Reference numeral 35 denotes a push button type power switch attached to the operation panel 28a, which outputs an on / off signal for operating the main power source 37 of the controller 36 by the push operation.

  Reference numeral 36 denotes a controller attached to the crane body. The controller 36 receives the operation signal transmitted from the remote operation device 28, and switches to the corresponding control valves 17, 18, 19, 20 based on the operation signal received by the reception unit 36a. A valve switching signal output unit 36b that outputs an operation signal and an anti-theft control unit 36c that executes a predetermined anti-theft program based on an operation signal from the receiving unit 36a.

  Reference numeral 38 denotes an operation state storage means for storing password data, which is composed of a nonvolatile memory such as an EEPROM. The operation state storage means 38 is configured so that each operation that is operated at the time of input of the off operation signal based on a command signal from the controller 36 when the work is finished and the operator turns off the power switch 35 of the remote operation device 28. The operation states of the means 29, 30, 31, and 32 are stored as password data, and the password stored based on a command signal from the controller 36 when the operator turns on the power switch 35 in order to put the work vehicle in an operating state. Data is output to the anti-theft control unit 36c.

  The anti-theft control unit 36c executes the following anti-theft program based on the operation signal input from the receiving unit 36a and the password data read from the operation state storage means 38. That is, the anti-theft control unit 36c is operated at the time of inputting the signal based on the off operation signal if the operator turns off the power switch 35 of the remote control device 28 in order to store the work vehicle after the work is completed. The operating states of the operating means 29, 30, 31, 32, for example, for the operator to register password data, the turning operation means 29 is set to the “right turn” side, and the hoisting operation means 30 is set to the “downside” side, respectively. When the power switch 35 is turned off by operating it, signals corresponding to “turn right” and “fall down” operated at the time of input of the off operation signal are output to the operation state storage means 38 and the signal Is stored (registered) as password data, and then an off signal is output to the main power source 37 to turn off the controller 36. As a result, the operation states of the operation means 29, 30, 31, and 32 when the power switch is turned off are stored in the operation state storage means 38 as security data for theft prevention. Since the password data is stored in the operation state storage means 38 constituted by a non-volatile memory, the storage is maintained even during storage of the work vehicle with the controller 36 powered off.

  Further, the anti-theft control unit 36c outputs an on signal to the main power supply 37 first when the operator turns on the power switch 35 of the remote control device 28 in order to put the work vehicle in an operating state. And then output a read command signal to the operation state storage means 38 to register the registered password data (signals corresponding to the operation states of the operation means 29, 30, 31, 32 at the time when the power switch is turned off). Reading, collating the read password data with the operation state of each operation means 29, 30, 31, 32 operated at the time of the power switch on operation, and if the collation result is “same”, the unloading An excitation signal (valve closing signal) is output to the on-off valve 26 and the main relief valve 23 is switched to the on-load state. If the collation result is “different”, the unload on-off valve 26 is in the non-excited state (open state) To maintain the main relief valve 23 in the unloaded state. It is supposed to be.

  For example, when an operator who knows the password data turns the work vehicle into an operating state, the turning operation means 29, which is the same operation as when the power switch is turned off, is set to the “right turn” side, and the hoisting operation means 30 is set to “fall down” When the power switch 35 is turned on by operating each of the "" side, the anti-theft control unit 36c corresponds to the password data read from the operation state storage means 38 (in this case, "turn right" and "fall down") And the signals corresponding to “turn right” and “slope” input from the remote control device 28 are collated. In this case, since the collation result is “same”, the unloading on / off valve 26 is excited. A signal is output to switch the main relief valve 23 to an on-road state. Thereby, the drive oil from the hydraulic pump P is supplied to each control valve 17, 18, 19, and 20, and a working machine will be in an operation state.

  On the other hand, if a third party who does not know the password data does not operate normally (or performs an operation different from that when the power switch is turned off) and turns on the power switch 35, the remote control device 28 Since a signal corresponding to “no operation” (or different operation) is input from the anti-theft control unit 36c, the input signal and the password data read from the operation state storage means 38 (in this case, “turn right” ”And the signal corresponding to“ slipping ”, and in this case, the comparison result is“ different ”, so a non-excitation signal is output to the unloading on-off valve 26 and the main relief valve 23 is held in the unloaded state. Then, the drive oil from the hydraulic pump P is released to the tank so that the work machine cannot be driven.

  For this reason, even if a third party tries to start the engine of the work vehicle and steal the work vehicle by unauthorized means, the same release operation as the password data (the same operation as when the power switch is turned off and the power switch is turned on) The work vehicle cannot be put into operation unless it is done), and theft by a third party can be effectively prevented. In addition, since a plurality of operation means that are usually installed in the remote control device are used as the password data input means, it is not necessary to separately prepare a dedicated password number input means, and can be configured at low cost. . Further, since this type of work vehicle is usually equipped with a plurality of operation means, the number of combinations of password data can be set to a practically sufficient number. For this reason, it can be set as the reliable anti-theft device which is difficult for a third party to decipher.

  In this anti-theft device, the operator is authenticated in the operating state of each operating means 29, 30, 31, 32 at the time of turning on the power switch. When 36 power supplies are turned on, at least one operating means is in an operating state. For this reason, when a valve switching signal is output to the control valves 17, 18, 19, and 20 corresponding to the operating means 29, 30, 31, and 32 that are in the operating state at the same time as the controller 36 is turned on, the work vehicle is It is dangerous to move unintentionally. Therefore, it is preferable that the valve switching signal from the valve switching signal output unit 36b is not output unless the operator intentionally operates the speed instruction lever 33 of the remote control device 28. If there is a concern that the speed command signal may be output due to the neutral position adjustment of the speed indicator lever 33 or an erroneous operation, the output of the valve switching operation signal immediately after the main power supply 37 is turned on is restricted. It is configured to output a valve switching operation signal to the corresponding control valves 17, 18, 19, 20 for the first time when operating means 29, 30, 31, 32 are operated again after returning 29, 30, 31, 32 to the neutral position. May be.

  If there is a risk that the operator forgets the password data, the password for emergency release other than “No operation” is set, and if the worker forgets the password data, the password for emergency release is set. The anti-theft mode may be released by operating the operation means 29, 30, 31, 32 based on the data and turning on the power switch 35.

  Next, the operation of the antitheft device will be described.

  First, a procedure for storing the work vehicle in a parking lot or the like after the work is completed will be described.

  When the anti-theft function is desired to be stored when the work vehicle is stored, first, the left and right jacks 4c, 4c of the work vehicle are set to the jack-up state, and the vehicle 1 front part is lifted to make it impossible to run. This is because when the work vehicle is stored, the front part of the vehicle 1 is lifted so that the vehicle cannot move, so that even if a third party tries to steal the work vehicle by starting the engine by unauthorized means, the jack 4c, This is because, if 4c is not stored and the vehicle is not returned to the travelable state, the vehicle cannot travel and the antitheft effect is enhanced. Next, the telescopic boom 10 is turned to a predetermined retracted turning position, and the working vehicle is retracted to its minimum and most inclined position (see FIG. 1). At this time, if the telescopic boom 10 is intentionally lifted or extended, when the third party tries to steal the work vehicle, the telescopic boom 10 must be further retracted. You can expect the effect of increasing the possibility of giving up stealing this time. In addition, since the outrigger devices 4 and 4 project to the left and right are in the parked state, the stored state stored within the vehicle width is sufficient.

  Next, the operator operates the operation means 29, 30, 31, 32 of the remote control device 28 in a combination that is difficult for a third party to decode and is easy for me to remember (a combination of two or more operations is preferable) The power switch 35 may be turned off. As a result, a signal corresponding to the operation state of each operation means 29, 30, 31, 32 is transmitted to the controller 36 as password data, and the anti-theft control unit 36c receiving this is operated when the off operation signal is input. The operating state of the operating means 29, 30, 31, 32, for example, the operator operates the turning operation means 29 to the "right turn" side and the hoisting operation means 30 to the "downside" side to turn off the power switch 35. When operated, the signals corresponding to the “turn right” and “inclination” operated at the time of input of the off operation signal are output to the operation state storage means 38 and stored as password data, and then stored in the main power source 37. The controller 36 is turned off by outputting an off signal. As a result, the operation states of the operation means 29, 30, 31, 32 at the time when the power switch is turned off are stored in the operation state storage means 38 as password data.

  Next, a procedure for moving the work vehicle to another work site or resuming the work vehicle to resume work will be described.

  To put the work vehicle in an operating state, the operator operates the power switch 35 on by performing the same operation as the power switch off operation in which the operation means 29, 30, 31, and 32 of the remote control device 28 are registered as password data. do it. Thereby, the anti-theft control unit 36c corresponds to the signal corresponding to the password data read from the operation state storage means 38 and the operation state of the operation means 29, 30, 31, 32 input at the time of the power switch on operation. If the comparison result is “same”, an excitation signal (valve closing signal) is output to the unloading on / off valve 26 and the main relief valve 23 is switched to the on-load state. ", A non-excitation signal is output to the unloading on-off valve 26 to hold the main relief valve 23 in an unloaded state. For example, when the power switch is turned off, the turning operation means 29 is operated to the “right turn” side, and the raising / lowering operation means 30 is operated to the “downturn” side, so that “right turn” and “falling” are supported as password data. When the signal is registered, the operator operates the turning operation means 29 which is the same operation as when the power switch is turned off to the “right turn” side, and the hoisting operation means 30 to the “falling” side. When the power switch 35 is turned on, the anti-theft control unit 36c receives the password data (in this case, signals corresponding to “turn right” and “fall down”) and remote data read from the operation state storage means 38. The signals corresponding to “turn right” and “slope” input from the controller 28 are collated. In this case, since the collation result is “same”, an excitation signal is output to the unloading on-off valve 26. The main relief valve 23 is switched to the on-road state. For this reason, the drive oil from the hydraulic pump P is supplied to the control valves 17, 18, 19, and 20 so that the work machine can be driven, and the outrigger devices 4 and 4 are retracted to drive the work vehicle. Returning to the position makes it possible to move to the work site or the like, and to resume the work by driving the work machine.

  Next, a case where a third party who does not know the password data tries to steal the work vehicle will be described.

  When a third party who does not know the password data performs an operation different from that when the power switch is turned off, for example, when the power switch 35 is turned on as usual without operating the operation means 29, 30, 31, 32, Since a signal corresponding to “no operation” is input from the remote control device 28, the antitheft control unit 36c uses the input signal and the password data read from the operation state storage means 38 (in this case, “turn right”). And the signal corresponding to “falling”). In this case, since the collation result is “different”, a non-excitation signal is output to the unloading on-off valve 26 and the main relief valve 23 is held in the unloaded state. It is like that. As a result, the drive oil from the hydraulic pump P is released to the tank and the working machine cannot be driven, and the outrigger devices 4 and 4 cannot be retracted, so that the work vehicle can be prevented from being stolen by a third party. It is.

  When the work vehicle is stored in a managed parking lot where there is no fear of theft, the power switch 35 may be turned off as usual without operating the operation means 29, 30, 31, 32. . In this case, since the signal corresponding to “no operation” is registered as the password data in the operation state storage means 38, the operation means 29 which is the same operation as when the power switch is turned off when the work vehicle is put into an operating state. , 30, 31 and 32, the power switch 35 may be turned on as usual without any operation. As a result, the work vehicle can be stored and transferred to an operating state in the same procedure as a conventional work vehicle.

It is explanatory drawing explaining the structure of the work vehicle equipped with the antitheft device of this invention. It is explanatory drawing explaining the structure of an antitheft device.

Explanation of symbols

A work vehicle,
1 track,
1a chassis frame,
2 cab,
3 cargo bed,
・ Outrigger device,
5 small cranes,
6 Crane base,
7 swivel motor,
8 swivel post,
9 undulating cylinder,
10 telescopic boom,
101 proximal boom,
102, 103 Boom on the distal end side,
11 telescopic cylinder,
12 winch motor,
13 Hook hanging wire rope,
14 winch device,
15 hook block,
17 slewing control valve,
18 Undulating control valve,
19 telescopic control valve,
20 winch control valve,
21 Outrigger control valve,
23 Main relief valve,
23a vent circuit,
23b Pilot relief valve,
26 Open / close valve for unloading,
28 remote control devices,
28a operation panel,
29 swivel operation means,
30 Undulating operation means,
31 Telescopic operation means,
32 winch operation means,
33 Speed indicator lever,
35 Power switch,
36 controllers,
36a receiver,
36b Valve switching signal output section,
36c anti-theft control unit,
37 Main power supply,
38 operation state storage means,

Claims (1)

An anti-theft device for a work vehicle equipped with an outrigger device and a work implement that supports the vehicle so that it cannot run in a jack-up state at the rear of the cab of the vehicle,
A remote operation device equipped with a plurality of operation means for driving the work machine and a power switch, at least a hydraulic circuit for driving the outrigger device, and opening the drive oil to the tank by switching operation to the unload state to outrigger An unloading valve that disables driving of the device, an operation state storage unit that stores an operation state of the operation unit that is operated when the power switch of the remote control device is turned off, and a controller, The controller stores the operation state of the operation means operated when the power switch is turned off when the outrigger device is jacked up and stored in the operation state storage means as password data. The operating state of the operating means being operated at the time when the power switch is turned on when putting the operating state into operation, and the operating state The operation is characterized by collating the password data stored in the memory means and outputting a valve switching signal for switching the unload valve to the on-load state if the collation results are the same. Car anti-theft device.

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