JP5087243B2 - Counterweight weight detection device for work vehicles - Google Patents

Description

  The present invention relates to a counterweight weight detection device for a work vehicle having a counterweight whose weight can be changed at the rear part of a turntable. More specifically, the present invention relates to a counterweight weight detection device that detects a jack reaction force of an outrigger and detects a weight based on the detected value.

  Among working vehicles that have a swivel mounted on a traveling vehicle body and that have a working device on the swivel, a vehicle equipped with a counterweight for securing stability at the rear of the swivel is known. . Further, there is known one in which the weight of the counterweight can be changed according to the work content. Since it is necessary to detect the weight of the equipped counterweight in order to control the stability of the work vehicle during operation, various counterweight weight detection devices have been proposed.

For example, in the counterweight weight detection device described in Patent Document 1, when the first block 4a is attached to the rear part of the swivel base shown in FIG. 4, the contact of the first switch 7a shown in FIG. After that, when the second block 4b, the third block 4c, and the fourth block 4d are sequentially mounted, the second switch 7b, the third switch 7c, and the fourth switch 7d are similarly configured. The contacts are sequentially switched. Thereby, the voltage dividing ratio of the reference voltage generated from the reference voltage generating unit 6a shown in FIG. 5 is sequentially changed, and the divided voltage is added to the analog input port 6b of the overload prevention device 6. Then, the counterweight mounting state determination unit 6c determines the mounting state of the blocks 4a to 4d shown in FIG. 4 and detects the weight of the counterweight.
JP-A-8-217382 (page 3-6, Fig. 1-3)

  However, the blocks 4a to 4d of the counterweight are not easy to handle because they have a large weight even though they are divided. For this reason, it is necessary to use another work machine such as a forklift to mount the blocks 4a to 4d shown in FIG. 4 on the rear part of the swivel base, and the switches 7a to 7d are damaged when the block is mounted on the swivel base. There was a fear of doing.

  Therefore, the present invention is intended to provide a counterweight weight detection device that does not require a switch that directly switches the contact point by a counterweight block and that does not cause damage to the switch or the like even if the weight of the counterweight is changed. is there.

  According to a first aspect of the present invention, there is provided a counterweight weight detection device for a work vehicle, wherein a swivel is rotatably mounted on a traveling vehicle body provided with an outrigger, and a counterweight capable of changing the weight is provided at a rear portion of the swivel. A counterweight weight detecting device for a working vehicle, wherein a jack reaction force detecting means for detecting a jack reaction force of the outrigger, and a detected total weight calculating means for calculating a detected total weight of the work vehicle from the jack reaction force signal; The counterweight weight for storing the total weight of the work vehicle corresponding to the weight of the counterweight and calculating the weight of the counterweight mounted on the work vehicle at that time by comparing the total weight of the work and the detected total weight. And an arithmetic means.

  Furthermore, the counterweight weight detection device for a work vehicle described in claim 2 of the present application is configured such that a swivel is slidably mounted on a traveling vehicle body provided with an outrigger, and a telescopic boom that is telescopic can be raised and lowered on the swivel. A counterweight weight detection device for a work vehicle that is pivotally attached and has a counterweight capable of changing its weight at the rear part of the swivel base, the jack reaction force detection means for detecting the jack reaction force of the outrigger, and the outrigger Outrigger overhang width detecting means for detecting the overhang width of the telescopic boom, boom attitude detecting means for detecting the attitude of the telescopic boom, boom load detecting means for detecting a load on the telescopic boom, and the jack reaction force signal, Detected total weight / center of gravity calculation means for calculating the detected total weight / center of gravity of the work vehicle from the outrigger extension width signal, counterweight weight, boom posture and boom negative The stored gross weight / center of gravity of the work vehicle corresponding to the outrigger extension width is stored, and the stored total weight / center of gravity is read out from the boom posture signal, boom load signal, and outrigger extension width signal. Counterweight weight calculating means for calculating the weight of the counterweight mounted on the work vehicle at that time by comparing the center of gravity with the detected total weight / center of gravity.

  According to the counterweight weight detection device for a work vehicle described in claim 1 of the present application, the total weight detected by the work vehicle is calculated from the jack reaction force signal detected by the jack reaction force detection means, and is stored. By comparing with the total stored weight of the work vehicle according to the weight, the weight of the counterweight mounted on the work vehicle at that time can be detected. That is, since a switch for directly switching the contact by the counterweight block is not required, there is no possibility of damaging the switch or the like even if the weight of the counterweight is changed.

  According to the counterweight weight detection device for a work vehicle described in claim 2 of the present application, the jack reaction force signal detected by the jack reaction force detection means, and the outrigger extension width signal detected by the outrigger extension width detection means, By calculating the detected total weight / center of gravity of the work vehicle from the stored weight of the counterweight, boom posture, boom load, and outrigger extension width signal, the stored total weight / center of gravity of the work vehicle is compared. The weight of the counterweight mounted on the work vehicle at that time can be detected. That is, since the counterweight weight is calculated in consideration of not only the weight but also the position of the center of gravity, more accurate counterweight weight detection can be performed. Furthermore, since the center of gravity is also taken into consideration, the weight of the counterweight mounted can be detected even when the work vehicle is working regardless of the boom posture state of the work vehicle and the presence or absence of the boom load.

  FIG. 1 shows an all terrain crane 10 as an example of a work vehicle equipped with a counterweight weight detection device according to an embodiment of the present invention. The all terrain crane 10 has a swivel 13 mounted on a traveling vehicle body 12 having front and rear outriggers 11 so as to be capable of swiveling. A counterweight 14 whose weight can be changed is provided at the rear of the swivel base 13. The counterweight 14 is configured by stacking a plurality of plate-like blocks 15 in layers. The weight is changed by increasing or decreasing the number of blocks 15.

  An extendable boom 16 is pivotally mounted on the swivel base 13 so that the extendable boom 16 can be raised and lowered. Each of the outriggers 11 is provided with four jack cylinders 18 that can project to the left and right of the traveling vehicle body 12. By extending the jack cylinders 18, the entire terrain crane 10 is lifted from the ground. FIG. 1 shows a jack-up state in which all jack cylinders 18 of the outrigger 11 are extended. At this time, the entire weight of the all terrain crane 10 is supported by the entire jack cylinder 18. The jack cylinder 18 of the outrigger 11 is attached to the tip of the slide beam, and the slide beam can be extended in the left-right direction of the traveling vehicle body 12 by extending a slide cylinder (not shown).

  FIG. 2 is a block diagram of the counterweight weight detection apparatus according to the first embodiment. Reference numeral 20 denotes a jack reaction force detection means. The jack reaction force detection means 20 includes a right front jack reaction force detection means 21, a left front jack reaction force detection means 22, a right rear jack reaction force detection means 23, and a left rear jack reaction force detection means 24. Specifically, each jack reaction force detection means is constituted by a hydraulic pressure detector that detects the pressure of an oil passage communicating with the extension side oil chamber of the jack cylinder 18. Each oil pressure detector is provided. As described above, the jack reaction force detection means 20 includes four reaction force detectors. However, when detecting the jack reaction force, all the four jack cylinders 18 are grounded and all the reaction force detectors output detection signals. There is no need to output. Even if the three jack cylinders 18 are extended, if the all terrain crane 10 can be jacked up, then the jack reaction force signal based on the detection signals of the corresponding three reaction force detectors. It is also possible to determine the total detected weight of the all-terrain crane 10 described later.

  An arithmetic unit 25 includes a detected total weight calculating unit 26 and a counterweight weight calculating unit 27. The detected total weight calculating means 26 receives the jack reaction force signal from the jack reaction force detecting means 20 and calculates the detected total weight of the all terrain crane 10. On the other hand, the counterweight weight calculating means 27 stores the total storage weight of the all terrain crane 10 corresponding to the counterweight weight that changes depending on the stacked state of the blocks 15. Then, by comparing the detected total weight received from the detected total weight calculating means 26 with the stored total weight, the counterweight weight mounted on the all terrain crane 10 at that time is calculated.

  Reference numeral 28 denotes an overload prevention device disposed inside the crane cab 30 of the swivel base 13 of the all terrain crane 10. The overload prevention device 28 prevents overload by monitoring the load state when the suspended load is lifted by the telescopic boom 16. Device. The overload prevention device 28 functions to receive the counterweight weight calculated by the counterweight weight calculation means 27 and prevent an overload that exceeds a predetermined stable performance determined by the counterweight weight. Reference numeral 31 denotes a total weight display means which is disposed inside the crane cab 30 and receives and displays the detected total weight from the detected total weight calculation means 26. Reference numeral 32 denotes counterweight weight display means, which is also disposed inside the crane cab 30 and receives the counterweight weight from the counterweight weight calculation means 27 and displays it.

  The operation of the above-described counterweight weight detection device of the all terrain crane 10 is as follows. With the counterweight 14 mounted on the rear part of the swivel base 13, the jack cylinder 18 of the outrigger 11 of the all terrain crane 10 is always extended before the crane operation, and the all terrain crane 10 is jacked up. Then, the jack reaction force detection means 20 immediately detects the jack reaction force, and a jack reaction force signal is sent to the detected total weight calculation means 26. The detected total weight calculating means 26 calculates the detected total weight of the all terrain crane 10 and sends the detected total weight to the counterweight weight calculating means 27 and the total weight display means 31. The counterweight weight calculating means 27 stores the total storage weight of the all terrain crane 10 corresponding to the counterweight weight, and is mounted on the all terrain crane 10 at that time by comparing the total storage weight with the detected total weight. Calculate the counterweight weight. The calculated counterweight weight is sent to the overload prevention device 28 and the counterweight weight display device 32.

  As described above, since a switch or the like for directly detecting a weight is not required unlike the conventional counterweight weight detection device, there is no possibility of damaging the switch or the like when the weight is mounted. Therefore, the counterweight weight detection device can be set to 0 having high reliability.

  FIG. 3 is a block diagram of a counterweight weight detection apparatus according to the second embodiment. Reference numeral 20 denotes a jack reaction force detection means. The jack reaction force detection means 20 is composed of a right front jack reaction force detection means 21, a left front jack reaction force detection means 22, a right rear jack reaction force detection means 23, and a left rear jack reaction force detection means 24. This is the same as the detection apparatus according to the first embodiment described above. Reference numeral 40 denotes an outrigger extension width detecting means for detecting the extension width of the jack cylinder 18 of the outrigger 11 shown in FIG. Specifically, a length detector is used to detect the overhang widths of the four jack cylinders 18. In FIG. 3, the description of each detector is omitted.

  Reference numeral 41 denotes boom load detection means for detecting a boom load acting on the telescopic boom 16 by a suspended load or the like suspended from the tip of the telescopic boom 16 shown in FIG. Specifically, the holding pressure of the extension side oil chamber of the hoisting cylinder 17 is detected by a pressure detector. Reference numeral 42 denotes a boom posture detection means, which comprises a boom length detection means 43, a boom undulation angle detection means 44, and a boom turning angle detection means 45. Specifically, a length detector is used for the boom length detection means 43, and an angle detector is used for the boom undulation angle detection means 44 and the boom turning angle detection means 45.

  Although 46 is a calculating part, in this Embodiment, it is comprised integrally with the calculating part of the overload prevention apparatus of the all terrain crane 10. FIG. Reference numeral 47 denotes a boom posture calculation means which receives signals from the boom length detection means 43, boom undulation angle detection means 44, and boom turning angle detection means 45 and calculates the boom posture. 48 is a detection total weight / center of gravity calculation means which receives a jack reaction force signal from the jack reaction force detection means 20 and receives an outrigger extension width signal from the outrigger extension width detection means to detect the all terrain crane 10. The total weight and center of gravity are calculated.

  Reference numeral 50 denotes counterweight weight calculation means, which stores the total weight and center of gravity of the all-terrain crane 10 corresponding to the counterweight weight, the boom posture, the boom load, and the outrigger extension width that change depending on the block state. The counterweight weight calculator 50 receives the boom attitude signal from the boom attitude calculator 47, receives the boom load signal from the boom load detector 41, and receives the outrigger extension width signal from the outrigger extension width detector 40. Thus, the stored total weight and the center of gravity are read out. Further, the counterweight weight calculating means 50 is mounted on the all terrain crane 10 at that time by comparing the read stored total weight / center of gravity with the detected total weight / center of gravity received from the detected total weight / center of gravity calculating means 48. Calculate the counterweight weight.

  Reference numeral 51 denotes limit load calculation means, which reads the lifting performance stored in the lifting performance storage means 52, receives a boom posture signal from the boom posture calculation means 47, and outputs outriggers from the outrigger extension width detection means. The overhang width signal is received, the counterweight weight signal is received from the counterweight weight calculation means, and the limit load under the condition is calculated. Reference numeral 53 is a comparing means for receiving a boom load signal from the boom load detecting means 41, receiving a limit load signal from the limit load calculating means 51, and comparing the boom load and the limit load at that time. When the boom load has a predetermined relationship with the limit load, a restriction signal and an alarm / display signal are output.

  54 is a center-of-gravity position display means which is disposed inside the crane cab 30 shown in FIG. 1 and receives a center-of-gravity position signal from the detected total weight / center-of-gravity calculation means 48 and displays the position of the center of gravity. The total weight display means 31 and the counterweight weight display means 32 are the same as those described in the first embodiment shown in FIG. 55 is a crane work restricting means for receiving a restriction signal from the comparing means 53 and restricting the crane work of the all terrain crane 10. Reference numeral 56 denotes an alarm / display means, which is disposed inside the crane cab 30 shown in FIG. 1, and receives an alarm / display signal from the comparison means 53 and issues an alarm / display.

  The operation of the counterweight weight detection apparatus of the all terrain crane 10 according to the second embodiment described above is as follows. The jack cylinder 18 of the outrigger 11 of the all terrain crane 10 is extended and the all terrain crane 10 is jacked up with the counterweight 14 attached to the rear part of the swivel base 13. Then, the jack reaction force detection means 20 immediately detects the jack reaction force, and the jack reaction force signal is sent to the detected total weight / center of gravity calculation means 48. At the same time, the outrigger overhang detection means 40 detects the outrigger overhang width, and the outrigger overhang width signal is sent to the detected total weight / center of gravity calculation means 48. The detected total weight / centroid calculating means 48 calculates the detected total weight / centroid of the all terrain crane 10 and sends the detected total weight / centroid to the counterweight weight calculating means 50, the total weight display means 31, and the centroid position display means 54.

  The counterweight weight calculating means 50 stores the total weight / center of gravity of the all terrain crane 10 according to the counterweight weight, boom posture, boom load, and outrigger extension width. The counterweight weight mounted on the all terrain crane 10 at that time is calculated by comparing the weight and the center of gravity. The calculated counterweight weight is sent to the limit load calculating means 51 and the counterweight weight display means 32.

  As described above, since a switch or the like for directly detecting the counterweight is not required unlike the conventional counterweight weight detection device, there is no possibility of damaging the switch when the counterweight is mounted, so that the reliability is high. It can be set as a counterweight weight detection apparatus. Further, since the counterweight weight is calculated in consideration of not only the weight but also the position of the center of gravity, more accurate counterweight weight detection can be performed. Furthermore, since the center of gravity is also taken into consideration, the weight of the counterweight can be detected even when the all-terrain crane 10 is performing crane operations regardless of the state of the boom position of the all-terrain crane 10 and the presence or absence of the boom load.

  In the above-described embodiment, the counterweight weight detection device that automatically operates in conjunction with jack-up of the work vehicle (all terrain crane) 10 has been described, but a counterweight state determination switch may be provided separately. The counter weight state determination switch is provided on the condition that it becomes effective after jack-up, and detects the weight of the counter weight equipped when the switch is operated.

It is the figure which showed the jack-up state which all the jack cylinders 18 of the outrigger 11 of the all terrain crane 10 extended. It is a block diagram of the counterweight weight detection apparatus which concerns on 1st Embodiment. It is a block diagram of the counterweight weight detection apparatus which concerns on 2nd Embodiment. It is a split type counterweight mounted on the mobile crane described in Patent Document 1. 10 is a circuit diagram of a counterweight wearing state detection device described in Patent Document 1. FIG.

Explanation of symbols

10: Work vehicle (all terrain crane)
11: Outrigger 12: Traveling vehicle body 13: Turntable 14: Counterweight 16: Telescopic boom 20: Jack reaction force detecting means 26: Total detected weight calculating means 27: Counterweight weight calculating means 40: Outrigger extension width detecting means 41: Boom load detecting means 42: boom posture detecting means 48: total detected weight: center of gravity calculating means 50: counterweight weight calculating means

Claims (2)

A counterweight weight detection device for a work vehicle, in which a swivel is rotatably mounted on a traveling vehicle body provided with an outrigger, and a counterweight capable of changing its weight at the rear of the swivel,
Jack reaction force detection means for detecting the jack reaction force of the outrigger;
Detected total weight calculating means for calculating the detected total weight of the work vehicle from the jack reaction force signal;
Counterweight weight calculation for storing the total weight of the work vehicle according to the weight of the counterweight and calculating the weight of the counterweight mounted on the work vehicle at that time by comparing the total weight stored and the detected total weight. Means,
A counterweight weight detection device for a work vehicle, comprising: Work with a swivel base that can be swiveled on a traveling vehicle body that has an outrigger, a telescopic boom that can be telescopically mounted on the swivel base, and a counterweight that can change its weight at the rear of the swivel base A counter weight detection device for a car,
Jack reaction force detection means for detecting the jack reaction force of the outrigger;
Outrigger extension width detecting means for detecting the extension width of the outrigger;
Boom posture detecting means for detecting the posture of the telescopic boom;
Boom load detecting means for detecting a load on the telescopic boom;
A detected total weight / center of gravity calculating means for calculating the detected total weight / center of gravity of the work vehicle from the jack reaction force signal and the outrigger extension width signal;
Stores the total weight and center of gravity of the work vehicle according to the counterweight weight, boom posture, boom load, and outrigger extension width, and stores the total weight from the boom posture signal, boom load signal, and outrigger extension width signal. A counter weight weight calculating means for calculating the counter weight weight mounted on the work vehicle at that time by reading the center of gravity and comparing the stored total weight of the center of gravity with the detected total weight and the center of gravity;
A counterweight weight detection device for a work vehicle, comprising:

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