JP3057215U - Load detector for traveling construction machinery - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To solve the problem that the load that can be used originally is limited by always detecting an accurate load without being affected by the boarding position and to ensure stable operation. A supported part provided at one end of a basket is provided.
s is displaceably supported by a vertical support shaft 7 provided between an upper bracket piece 5 and a lower bracket piece 6 provided at the distal end of the boom 2, and is supported by the supported part 3s below the supported part 3s. A pressure sensor 4 to be pressurized is provided,
A bearing 8 is interposed between the supported portion 3s and the support shaft 7.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a load detection device for a traveling construction machine having a pressure sensor for detecting a load of a basket whose one end is supported at the tip of a boom.

[0002]

[Prior art]

 2. Description of the Related Art A traveling aerial work vehicle having a basket 54 whose one end is cantilevered at one end thereof as shown in FIG.

[0003] This type of aerial work vehicle has a movable bracket 53 rotatably supported by a horizontal shaft 52 at a distal end of a boom 51, and a movable bracket 53 provided at one end of a basket 54 by the movable bracket 53. While the support portion 54s is supported, the basket 54 is always kept horizontal by a vertical oscillating cylinder (hydraulic cylinder) 55 provided between the boom 51 and the movable bracket 53.

A hydraulic pressure sensor 56 that constitutes a load detecting device 60 is attached to the upper and lower oscillating cylinder 55 (hydraulic circuit), and the hydraulic sensor 56 detects a load W when an operator rides on the basket 54. In addition to detection, if the detected load (detected load) has reached a preset limit load, an alarm is issued or the operation is forcibly stopped to prevent the aerial work vehicle from tipping over.

[0005]

[Problems to be solved by the invention]

 However, in the above-described conventional load detecting device 60, since the magnitude of the load (torque) applied to the upper and lower oscillating cylinders 55 varies depending on the position of the worker riding on the basket 54, the detection obtained from the hydraulic sensor 56 is performed. The magnitude of the load also varies. For this reason, even if the limit load has not been reached, an alarm is issued or the operation is stopped, and the amount of load that can be used is limited, and the operation becomes unstable. There were problems such as giving. In order to solve such a problem, the display of the regular boarding position on the basket is also performed, but in reality it is not effective.

[0006] The present invention solves such a problem existing in the conventional technology. By always detecting an accurate load regardless of the boarding position, the load that can be originally used is reduced. It is an object of the present invention to provide a load detecting device for a traveling construction machine capable of solving a limited problem and ensuring stable operation.

[0007]

Means and Embodiments for Solving the Problems

 The present invention relates to a traveling type construction machine including a pressure sensor 4 for detecting a load W of a basket 3 having one end supported at the tip end of a boom 2, for example, a load detecting device 1 for a traveling type aerial work vehicle M. In particular, the supported portion 3s provided at one end of the basket 3 can be displaced by the vertical support shaft 7 provided between the upper bracket piece 5 and the lower bracket piece 6 provided at the tip of the boom 2. And a pressure sensor 4 pressurized by the supported portion 3s is disposed below the supported portion 3s, and a bearing 8 is interposed between the supported portion 3s and the support shaft 7. Features. As a result, the load W of the basket 3 is directly applied to the pressure sensor 4, so that the detected load does not depend on the riding position and an accurate load is always detected.

[0008]

【Example】

 Next, a preferred embodiment according to the present invention will be described in detail with reference to the drawings.

First, the configuration of a traveling aerial work vehicle (traveling construction machine) M including the load detection device 1 according to the present embodiment will be described with reference to FIGS.

Reference numeral 20 denotes a traveling machine, which includes a crawler belt type self-propelled portion 21 and a vehicle body portion 23 supported above the self-propelled portion 21 via a turntable 22.

On the other hand, a boom 2 is provided at the front end of the vehicle body 23. The boom 2 includes a first boom section 24 and a second boom section 25 connected in a refraction manner. The second boom section 25 is further configured to be telescopic, and has an arm section 26 at a distal end. Reference numeral 27 denotes a first undulating cylinder for raising and lowering the first boom portion 24, and reference numeral 28 denotes a second undulating cylinder for raising and lowering the second boom portion 25.

A movable bracket 30 is rotatably attached to a distal end of the arm 26 (a distal end of the boom 2) via a horizontal shaft 31. Further, an upper bracket piece 5 and a lower bracket piece 6 are integrally provided at the front end of the movable bracket 30, and a vertical support shaft 7 is provided between the upper bracket piece 5 and the lower bracket piece 6. Then, a supported portion 3s provided at one end of the basket 3 is slidably mounted on the support shaft 7. In this case, as shown in FIG. 3, the supported portion 3s has a predetermined thickness in the vertical direction, and is loaded on the support shaft 7 via a bearing 8 provided inside. An upper and lower oscillating cylinder 32 is provided between the movable bracket 30 and the basket 3 to maintain the basket 3 in a horizontal position, and 32 is provided between the arm 26 and the movable bracket 30. 3 is a left and right oscillating cylinder that turns the support shaft 3 around the support shaft 7 as a fulcrum.

Further, a pressure sensor 4 that is pressed by the supported portion 3s is provided on the upper surface of the lower bracket piece 6 and below the supported portion 3s. In this case, the pressure sensor 4 has a donut shape as a whole, and the support shaft 7 is inserted into the center gap. The pressure sensor 4 can use a strain sensor or the like that detects the amount of deformation (strain) of the medium to be detected due to the pressing force.

FIG. 4 shows a signal processing system. 40 is a computer unit. The pressure sensor 4 is connected to the input section of the computer section 40, and the alarm section 41 and the stop control section 42 are connected to the output section. The alarm unit 41 has a function of sounding an alarm sound or turning on an alarm lamp according to a control signal of the computer unit 40, and the stop control unit 42 has a function of forcibly stopping the operation. Note that either one of the alarm unit 41 and the stop control unit 42 may be used.

Next, the operation of the load detection device 1 according to the present embodiment will be described.

Now, in FIG. 2, it is assumed that an operator has boarded the basket 3. In this case, the vertical load W applied to the basket 3 is directly applied to the pressure sensor 4 via the supported portion 3s, and the load W is directly detected by the pressure sensor 4. Therefore, accurate load can always be detected regardless of the boarding position, and the problem of limiting the amount of load that can be used originally can be eliminated, and stable operation can be ensured.

On the other hand, the load (detected load) detected by the pressure sensor 4 is applied to the computer 40, and the detected load is compared with a preset limit load. When the detected load reaches the limit load, the computer unit 40 gives a control signal to the alarm unit 41 and the stop control unit 42 to sound an alarm sound, turn on an alarm lamp, and forcibly stop the operation. Is performed.

Although the embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the configuration, shape, and the like of the details can be arbitrarily set without departing from the gist of the present invention. Can be changed. For example, in the embodiment, an aerial work vehicle is exemplified as the traveling construction machine, but the traveling construction machine is a concept including various similar machines such as a traveling luggage carrier that loads and transports luggage and the like in a basket. .

[0019]

[Effect of the invention]

 As described above, the load detecting device of the traveling construction machine according to the present invention has a vertical section in which the supported portion provided at one end of the basket is provided between the upper bracket piece and the lower bracket piece provided at the tip of the boom. In addition to being displaceably supported by the support shaft, a pressure sensor pressurized by the supported portion is provided below the supported portion, and a bearing is interposed between the supported portion and the support shaft. It has the following remarkable effects.

Since an accurate load can always be detected without being influenced by the boarding position, it is possible to solve the problem that the magnitude of the load that can be used originally is limited.

Since a stable operation can always be ensured, the worker can work with peace of mind.

[Brief description of the drawings]

FIG. 1 is a side view of a pressure sensor provided in a load detection device according to the present embodiment and the periphery thereof;

FIG. 2 is an overall side view of an aerial work vehicle equipped with the load detection device according to the embodiment;

FIG. 3 is a partial cross-sectional side view of a pressure sensor provided in the load detection device and a periphery thereof;

FIG. 4 is a block diagram of a signal processing system in the load detection device;

FIG. 5 is a side view showing a part of an aerial work vehicle equipped with a load detection device according to the related art;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Load detection apparatus 2 Boom 3 Basket 3s Supported part 4 Pressure sensor 5 Upper bracket piece 6 Lower bracket piece 7 Support shaft 8 Bearing W Load M Work platform

Claims (2)

[Utility model registration claims] 1. A load detecting device for a traveling construction machine comprising a pressure sensor for detecting a load of a basket having one end supported at a tip end of the boom, wherein the supported portion provided at one end of the basket is connected to the boom. The pressure sensor, which is displaceably supported by a vertical support shaft provided between an upper bracket piece and a lower bracket piece provided at the distal end of the bracket, and is pressed by the supported part below the supported part. A load detecting device for a traveling construction machine, wherein the load detecting device is disposed and a bearing is interposed between the supported portion and the support shaft. 2. The load detecting device for a traveling type construction machine according to claim 1, wherein the device is applied to a traveling type aerial work vehicle.