JP7247041B2 - Sensor mounting stay for heavy machinery and heavy machinery with contact prevention function - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sensor attachment stay for attaching a proximity sensor to a boom of heavy machinery and a heavy machinery with a contact prevention function to which the sensor attachment stay is attached in order to prevent contact with surrounding objects or people.

When working with heavy machinery in narrow structures such as small tunnels, the operator must be careful not to let the boom or arm of the heavy machinery come into contact with the structure or people or objects inside the structure. ing.
In particular, railway tunnels have important equipment such as train radios, high-voltage cables, and signal cables laid on the side walls of the tunnel. is required.

For example, Patent Literature 1 below discloses an approach alarm device that automatically issues an approach alarm when a crane approaches a power transmission line using a sensor attached to the tip of the crane.

Japanese Patent Application Laid-Open No. 2006-199440

With reference to the above prior art, the applicant places a commercially available proximity sensor on the boom of heavy machinery, and when the measured value by the proximity sensor is less than a predetermined value, a device that issues a warning or stops the heavy machinery. As development progressed, at least one of the following problems arose.
(1) Since there is little space in the boom or arm where proximity sensors can be directly installed, there are many restrictions on the layout and number of proximity sensors to be installed, and there is a limit to accurate proximity detection.
(2) During the operation of the boom or arm, an error may occur in which the measured value of the proximity sensor suddenly becomes a numerical value within the stopping distance, causing the stopping device to malfunction. This was especially noticeable when the boom or arm moved abruptly.

SUMMARY OF THE INVENTION Accordingly, one object of the present invention is to provide a means that enables stable approach detection without being restricted by the operation mode of the boom.

A first invention of the present application, which has been made to solve the above problems, is a sensor mounting stay for mounting a proximity sensor on a boom of a heavy machine in order to prevent contact between the heavy machine and an object or a person, the stay being attached to the boom. a fixed portion having an attachment/detachment mechanism of; a movable portion connected to the fixed portion so as to be vertically rotatable and having a mounting surface for the proximity sensor; and between the fixed portion and the movable portion It is characterized by comprising at least an interposed damper.
A second invention of the present application is characterized in that, in the first invention, a stopper made of an elastic member is provided in the fixed portion at a limit position of the rotational movement of the movable portion.
Further, the third invention of the present application is a heavy machine with a contact prevention function for preventing contact with surrounding objects or people, which is directly or indirectly attached to the boom of the heavy machine, the first invention or the second invention. a plurality of proximity sensors arranged at different predetermined angles from both sides of the boom with respect to the sensor mounting stay, and alarm notification based on measured values from the proximity sensors. and a control device for controlling the engine speed of the heavy machinery. The distance for starting drop control and the distance for starting stop of the heavy equipment can be individually set for each proximity sensor.

According to the present invention, it has at least one of the following effects.
(1) By arranging the proximity sensor on a stay that can be attached to the boom of heavy machinery, the layout and number of the proximity sensors can be designed flexibly.
(2) By providing a damper between the fixed part and the movable part that make up the stay, it is possible to prevent the heavy equipment and main body from being driven by the engine of the heavy equipment, moving the heavy equipment, moving the boom and arm, excavating with the bucket, etc. It is possible to reduce the transmission of vibrations and impacts to the moving parts. Therefore, it contributes to prevention of erroneous detection of the proximity sensor attached to the movable part.
(3) The damper prevents a large impact from being applied to the proximity sensor attached to the movable portion, thereby contributing to prevention of breakage of the proximity sensor.
(4) By providing a stopper on the fixed part, it is possible to prevent the movable part from suddenly collapsing and interfering with the fixed part or the arm when the gas pressure of the damper is released.

FIG. 1 is a schematic side view of a heavy machine equipped with a stay according to the present invention; 1 is a schematic side view showing the configuration of a stay according to the present invention; FIG. The schematic perspective view which shows the connection part of a fixing|fixed part and a movable part. FIG. 4 is a schematic plan view showing the shape of the distal end side of the movable portion;

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

<1> Overall configuration (Fig. 1)
A heavy machine B with an interference prevention function (hereinafter simply referred to as "heavy machine B") according to the present invention will be described with reference to FIG.
A heavy machine B shown in FIG. 1 is a backhoe having at least a boom B1 and an arm B2.
An arm cylinder bracket is provided at the tip of the boom B1 of the heavy equipment B, and a sensor mounting stay A according to the present invention (hereinafter simply referred to as "stay A") is attached to this bracket so as to extend forward. is fixed.
The stay A includes a fixed portion 10 having an attachment/detachment mechanism with the heavy machine B, a movable portion 20 connected to the fixed portion 10 so as to be vertically rotatable, a proximity sensor 30 attached to at least the movable portion 20, and a fixed portion. At least a damper 40 interposed between the portion 10 and the movable portion 20 is provided.
Heavy machinery B is also equipped with a control device (not shown) that notifies an alarm and controls the engine speed of heavy machinery B based on the values measured by the proximity sensor 30. installed in the driver's seat, etc.).
Details of each component will be described below.

<3> Fixed part (Fig. 2, Fig. 3)
The fixed part 10 is a member that is detachably attached to the boom B1 of the heavy equipment B and rotatably connected to the movable part 20 .
The fixed part 10 has a shape and structure that is fixed to a predetermined position of the boom B1 from both sides of the boom B1.
In the embodiment shown in FIGS. 2 and 3, the fixing portion 10 is provided with a pair of mounting portions 11 that can be mounted on both sides of the boom B1, a connection portion 12 that integrates the pair of mounting portions 11 at the top, and a mounting portion It comprises at least a restricting part 13 attached to the upper and lower sides of 11 with a gap therebetween.

<3.1> Mounting portion (Figs. 2 and 3)
The attachment portion 11 is a member for attaching the fixing portion 10 to the boom B1.
In the embodiment shown in FIG. 3, the mounting portion 11 is made of a steel member having an approximately inverted L shape when viewed from the front, the upper portion of which is bent toward the outside of the boom B1.
A pedestal 14 for attaching the lower restricting portion 13 and a mounting hole 111 through which a fastening member such as a bolt can be screwed between the mounting portion 11 and the boom B1 are provided on the lower side of the mounting portion 11 .
A coupling mechanism with a movable portion 20, which will be described later, is formed on the upper side of the mounting portion 11. As shown in FIG.

<3.2> Connections (Figs. 2 and 3)
The connecting portion 12 is a member for increasing the rigidity of the fixed portion 10 .
In the embodiment shown in FIG. 3, the connecting portion 12 is formed of a steel plate that connects the pair of mounting portions 11 together.
Note that if the rigidity of the fixed portion 10 is sufficiently ensured by the pair of mounting portions 11, the connection portion 12 is not an essential member in the present invention.

<3.3> Regulator (Figs. 2 and 3)
The regulating portion 13 is a member for regulating the limit position of the rotating motion of the movable portion 20, which will be described later.
In the embodiment shown in FIG. 3, the restricting portion 13 is configured by placing long steel members having a substantially U-shaped cross section at intervals in the vertical direction of the mounting portion 11 .
By positioning the overhanging portion 213 provided on the movable portion 20 with respect to the restricting portion 13 between the upper and lower elongated members, the rotating motion of the movable portion 20 can be restricted.

<3.3.1> Gap situation (Fig. 3)
A gap 131 is formed between the elongated member forming the restricting portion 13 and the mounting portion 11 . This is to allow the extending portion 21 to enter and leave the gap 131 as the movable portion 20 rotates, which will be described later.

<4> Movable part (Figures 2 to 4)
The movable part 20 is a member that can turn vertically with respect to the fixed part 10 with the horizontal direction of the heavy machine B as a rotation axis.
The movable part 20 is located on both sides of the boom B1, and includes a pair of extending parts 21 that can be rotatably attached to the fixed part 10, and a connecting part that connects and integrates the pair of extending parts 21 at the upper part. 22 at least.
Therefore, the movable portion 20 has a generally U-shape in plan view with the rear end side of the boom B1 opened.

<4.1> Extension part (Fig. 2, Fig. 4)
The extending portion 21 is a member for attaching a proximity sensor 30, which will be described later.
The extending portions 21 are rotatably connected to the fixed portion 10 respectively.
In the embodiment shown in FIG. 4, the extending portion 21 is formed of a long steel plate, and the steel plate is bent at an appropriate predetermined angle from the rear end side to the front end side.

<4.1.1> Rotating part (Figs. 2 and 3)
A rotating portion 211 is formed at the rear end of the extending portion 21 to connect with the mounting portion 11 constituting the fixed portion 10 .
In the embodiment shown in FIG. 3, the rotating portion 211 is configured by a mechanism that is rotatable with respect to the mounting portion 11 with the lateral direction of the heavy equipment B as the pin direction. The movable part 20 can be turned vertically.

<4.1.2> Mounting surface (Fig. 2, Fig. 4)
Each extending portion 21 is provided with a mounting surface 212 for the proximity sensor 30 .
In the embodiment shown in FIG. 4, the mounting surface 212 is the outer surface side of a steel plate bent at a predetermined angle.
The angle of the mounting surface 212 may be appropriately designed according to the performance and the number of installed proximity sensors 30 .

<4.1.3> Overhang (Figs. 2 and 3)
Each extending portion 21 is provided with an overhanging portion 213 for interfering with the restricting portion 13 of the fixed portion 10 .
In the embodiment shown in FIG. 3, a steel plate is welded so as to protrude laterally from the outer surface of the extended portion 21 to form a protruding portion 213. The protruding portion 213 is located between the upper and lower restricting portions 13. By setting it in the positioned state, the limit position of the rotational movement of the movable portion 20 is defined.

<4.2> Communication part (Figures 2 to 4)
The connecting portion 22 is a member for connecting and integrating the pair of extending portions 21 .
By integrating the pair of extending portions 21 , the connecting portion 22 prevents the proximity sensors 30 provided on both sides of the boom B<b>1 from being misaligned and secures the rigidity of the movable portion 20 .
In the embodiment shown in FIGS. 3 and 4, the connecting portion 22 is composed of a steel plate which is connected so as to connect the upper edges of the steel plates forming the extended portion 21 .

<5> Proximity sensor (Figs. 2 to 4)
The proximity sensor 30 is a member for measuring the separation distance from surrounding people and objects.
In the present invention, the proximity sensor 30 is appropriately provided at least on the outer surface of the movable part 20 and has a function of measuring the separation distance from surrounding people and objects. This is used to determine whether or not a person or object is approaching the boom B1 or arm B2.
As the proximity sensor 30 according to the present invention, a known sensor such as a laser sensor, an ultrasonic sensor, or the like that can measure the separation distance from surrounding people or objects can be used.
Also, the layout and the number of the proximity sensors 30 may be appropriately designed in accordance with the performance of the proximity sensors 30 within a range where there is no omission of detection.

<6> Damper (Fig. 2)
The damper 40 is interposed between the fixed part 10 and the movable part 20 to absorb vibrations and shocks generated in the heavy machine B and the main body, thereby reducing the vibrations and shocks transmitted to the movable part 20. is.
In the embodiment shown in FIG. 2, a damper 40 is provided so as to connect the mounting portion 11 of the fixed portion 10 and the extension portion 21 of the movable portion 20, and when the movable portion 20 rotates downward, , the damper 40 compresses and dampens the vibrations and impacts of the heavy machinery B and the main body caused by the engine drive of the heavy machinery B, the movement of the heavy machinery B, the movement of the boom B1 and the arm B2, the excavation operation by the bucket, etc. It is configured so that it is difficult to transmit to the movable part 20. - 特許庁

<7> Stopper (Figs. 2 and 3)
In the present invention, a stopper 50 may be provided at the limit position of the rotational movement of the movable portion 20 with respect to the fixed portion 10 .
In the embodiment shown in FIGS. 2 and 3, the stopper 50 is composed of an elastic member arranged in the restricting portion 13 that constitutes the fixing portion 10 .
The stopper 50 defines the limit position of the rotational movement of the movable part 20 with respect to the fixed part 10, thereby preventing interference between the fixed part 10 and the movable part 20 and the movement of the movable part 20 and heavy machinery due to the rotational movement. It exhibits the effect of preventing damage to each part due to interference with B.
Further, the stopper 50 effectively functions to prevent the movable portion 20 from tilting forward even when the damper 40 fails due to gas pressure loss.

<8> Control device (not shown)
The control device is a device capable of notifying an alarm and controlling the engine speed of the heavy equipment B based on the measured value from the proximity sensor 30 .
In the present invention, the control device is installed in a place where there is no hindrance to the operation of the heavy machinery B, receives the measured value from each proximity sensor 30, and determines whether or not an alarm is notified based on the measured value. and the engine speed of the heavy machinery B is controlled.
For example, the controller can set two different threshold values for each proximity sensor 30. For example, when the distance measured by the proximity sensor 30 reaches the first threshold value It can be configured to reduce the number of revolutions of the engine while notifying an alarm, and to stop the heavy machinery B when the number of revolutions reaches the second threshold value or less.
These control methods can be appropriately designed according to the site environment and desired conditions.

A Stay 10 Fixed part 11 Mounting part 111 Mounting hole 12 Connecting part 13 Regulating part 14 Pedestal 131 Gap 20 Movable part 21 Extension part 211 Rotating part 212 Mounting surface 213 Overhanging part 22 Communication part 30 Proximity sensor 40 Damper 50 Stopper B Heavy equipment B1 Boom B2 Arm

Claims (4)

A sensor mounting stay for mounting a proximity sensor on a boom of heavy equipment to prevent contact between the heavy equipment and objects or people,
a fixing part having an attachment/detachment mechanism with the boom;
a movable part that is vertically rotatably connected to the fixed part and has a mounting surface for the proximity sensor;
A damper interposed between the fixed part and the movable part,
Sensor mounting stay for heavy machinery. In the fixed part, a stopper made of an elastic member is provided at the limit position of the rotational movement of the movable part,
The sensor mounting stay for heavy machinery according to claim 1. Heavy equipment with a contact prevention function to prevent contact with surrounding objects or people,
The sensor mounting stay according to claim 1 or 2, which is directly or indirectly mounted on the boom of heavy equipment;
a plurality of proximity sensors arranged to provide different predetermined angles from both sides of the boom with respect to the sensor mounting stay;
a control device that controls the notification of an alarm and the engine speed of the heavy equipment based on the measured value from the proximity sensor;
characterized by having at least
Heavy equipment with anti-contact function. The control device is configured to be able to individually set a distance for starting notification of an alarm and control to reduce engine speed and a distance for starting to stop heavy machinery for each proximity sensor. characterized by
The heavy equipment with an interference prevention function according to claim 3.

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