JP2945536B2 - Work machine safety devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy equipment having various types of swivel used for construction work and excavation work, for example, working machines such as excavator, pile driver, crawler crane, hydraulic backhoe, clamshell and the like. The present invention relates to a safety device for a working machine that can be conveniently used by being applied to a work machine.

[0002]

2. Description of the Related Art Conventionally, as a safety device for a work machine of this type, an ultrasonic transmitter and a receiver are provided around a turntable on the machine in order to prevent the machine from being damaged by contact with other objects. equipped with a non-contact type sensor consisting of those swivel base during turning is configured to issue an alarm to approach or set distance relative to the other (e.g., see JP-a-59-26893) , Surrounding the flexible foam material with a flexible cover material
Buffer body with many built-in pressure-sensitive sensors on the back side of the cover material
The block is formed so as to be freely attached to the fuselage.
Warning sound or warning light etc.
Emergency reporting means attached to the aircraft for emergency reporting
(For example, see Japanese Utility Model Application Laid-Open No. 60-8753) .

[0003]

The object of the invention is to be Solved However, the above is of conventional former structure, the operating conditions, such as construction sites, such as to allow the existence of a worker in close proximity to the work machine, of obstacles If the detection set distance is set to be sufficiently large, the detection set distance must be set very close because it frequently reacts too much to be practical, but in this case, the ultrasonic transmitter or the receiver is required to be set. Unless provided at a number of locations around the body, accurate short-range detection cannot be performed, and a large number of expensive ultrasonic sensors must be used, which is disadvantageous in terms of cost. And others
Alarms are issued for proximity to objects, but work machines
It does not stop itself. Therefore, the safety of workers
It cannot be reliably maintained. To solve such a problem, for example, as the conventional latter pair cushion
A number of pressure sensitive sensor arranged on a backside of the cover material which, because by placing the cushion in the fuselage circumference, if child detecting contact with other object, the large number of pressure-sensitive sensor, wherein Loose
Impact of workers contacted by impact of impact is reduced
But the aircraft is stopped only with an alarm
And still have problems in ensuring worker safety.
It was. In other words, since this type of working machine has extremely large inertia not only when the body is moved but also when each working unit is moved, the contact sensor can detect the type and size of the object to be detected. When configured with a high detection sensitivity to be able to detect reliably even be, there is a fear that easily damaged by contact with other object, if dull setting the detection sensitivity to the contrary, the driver body Even stop
There is no margin of that time, the operator may result in bodily injury,
There remains a problem in configuring a safety device using only contact sensors and alarms in this type of work machine. The purpose of the present invention is
For workers who work close to the work machine or at construction sites where various materials are scattered, etc., ensure the safety of workers and set the obstacle detection setting distance close enough to be practical. An object of the present invention is to provide a safety device which is low in cost and has excellent durability.

[0004]

Means for Solving the Problems The technical means of the present invention taken to achieve the above object is to provide a safety device for a working machine, in which a shock absorber is constituted by an elastic body filled with a fluid.
On both sides and the rear of the swivel,
Formed integrally and based on the detection signal from the contact sensor
To stop the operation of the swivel table, which has been operated in the contact direction,
Or stop the traveling of the traveling aircraft that has traveled in the contact direction.
That is, the control device is configured as described above (claim 1) . still,
The contact sensor is formed in a belt shape, and the contact sensor is integrally formed.
It is configured so that contact can be detected at any point in the length direction.
The contact sensor extends over the entire length of the buffer in the arrangement direction.
A sir can be arranged (claim 2) . Also, the buffer member, and an elastic body encapsulating gas, the contact sensor, may be configured to detect changes in the gas pressure of the buffer body portion (claim 3).

[0005]

The operation of the above technical means is as follows. a. That is, the cushion having a role of shock absorption, fluid
By constructing with an elastic body in which
Is flexible due to elastic deformation of the entire elastic body
Absorbs shocks based on the detection signal from the contact sensor.
To stop the operation of the turntable or stop the traveling of the traveling machine.
Control device to stop the
With the cooperation of both tactile sensors , even if workers touch ,
Immediately stops the body, so there is strong impact against workers.
To ensure that workers are safe by preventing
Doo is possible, that the sensor itself is damaged heavily impact due to contact with the obstacle can also be avoided by the action of the shock absorber (claim 1). b. In addition, a fluid is sealed inside the elastic body to constitute the buffer.
Since it is formed, if another object comes into contact with the buffer,
Since the pressure of the enclosed fluid increases, the contact sensor
Comprises a pressure-sensitive sensor that detects the pressure of the fluid.
With such a configuration, a single pressure sensitive
Sensor can detect contact with other objects around the aircraft
(Claim 1). c . Further, the contact sensor is formed in a belt shape, and is integrally formed.
Configuration so that contact can be detected at any point along its length
The contact sensor extends over the entire length of the buffer in the arrangement direction.
Since is disposed Sir, as conventionally is not necessary to use a large number of sensors, or a single sensor, it is possible to reliably detect that the detection target range near field around the working body (claim 2) . d. Furthermore, a gas is sealed in an elastic body to constitute the buffer.
By doing so, it is possible to reduce the weight of the buffer,
If another object comes into contact with the gas, the gas is compressed.
Shock can also be absorbed by the elasticity of the body, making temporary contact with workers
Even if you do, the worker can be protected from the impact of the contact.
(Claim 3). e. Moreover, with the buffering action of the buffer, the
Since the pressure of the gas increases, how much of the buffer
Contact sensor that detects changes in gas pressure even when touching the device
Can immediately detect contact with other objects without leakage?
The aircraft can be stopped without fail.
Can be ensured (claim 3).

[0006]

[Effect of the Invention] The a, from the action of b, according to the <br/> present invention according to claim 1, the avoidable sensors that aircraft is damaged by contact with an obstacle, the contact between the body It can be used as a means for avoiding injuries of workers due to accidents, and there is an effect that a sensor having good durability can be obtained as a detection sensor therefor. Moreover, contact
The tactile sensors can be made of inexpensive ones,
As a result, the safety device can be configured at low cost. In addition, the above-mentioned
In addition to the actions of a and b, the action of c above can be used to detect and set obstacle detection to such an extent that it can be put to practical use in workers working in the vicinity of the work machine or in construction sites where various materials are scattered. Effective use of sensors that can set the distance closer
Therefore , a contact sensor can be provided at low cost. Further, in addition to the effects of a and b described above,
From the operation, the safety device can be constructed lightly and inexpensively.
Become.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows the entire side surface of a crawler crane which is an example of a working machine to which the safety device of the present invention is applied, and a swivel that makes a full turn around a turning center P on a traveling body 1 having a crawler type traveling device. 2, a crane device 3 is mounted on the swivel 2, and a safety device 4 of the present invention is mounted on the outer periphery of the body on the swivel 2. The safety device 4 is shown in FIGS.
As shown in the figure, a buffer 5 disposed on the outer peripheral portion of the swivel 2 of the working machine, a contact sensor 6 disposed on an outer peripheral edge thereof, and an alarm device 7 disposed in an appropriate position on the aircraft, The control device 8 instructs the alarm device 7 with an operation signal based on the detection signal from the contact sensor 6. The buffer body 5 is formed by sealing a gas such as air into an air tube 9 made of a flexible resin tube or the like, and has a sufficient elasticity to have a sufficient buffering effect when colliding with a human body. have. The contact sensor 6 has a band-shaped first contact terminal 11 made of a flexible conductive material adhered to a surface of the air tube 9 on the outer side of the fuselage, and covers the outside of the first contact terminal 11. A band-shaped cover 10 having flexibility and a shape-retaining property to the extent that it can be elastically restored is stuck, and a minute space is provided between the first contact terminal 11 and the inside of the band-shaped cover 10. Two contact terminals 12 are provided, and these two contact terminals 11, 1
It is configured to detect the presence or absence of contact with another object by the contact between two. The alarm device 7 includes a buzzer that operates in response to a command from the control device 8, a generator that alerts the driver by voice, or a warning light.

[Another Embodiment] A safety device 4 of the present invention has a structure shown in the above-described embodiment,
As shown in the examples below, various configurations can be employed. [1] As a working machine to which the safety device 4 is applied, in addition to the above-described crawler crane, the present invention is applied to various heavy equipment used in construction work and excavation work such as excavator, pile driver, hydraulic backhoe, clamshell, etc. . [2] A structure in which a liquid such as water or oil is filled as the buffer 5 instead of the air-filled air tube 9 described above, and the liquid is discharged from a pressure reducing means such as a relief valve upon contact with another object. It is also possible. [3] The buffer 5 is not limited to the above-described fluid-based one, but may be a rubber or a sponge or other material capable of volume elastic deformation. Any material may be employed as long as it can buffer the injury. [4] As the contact sensor 6, a strain detector is attached to the outside of the buffer 5 to electrically detect the amount of strain of the strain detector, or a wire having one end fixed to a fixed portion is connected to the buffer 5 And the other end of the wire is connected to a load cell to detect a load accompanying the bending of the wire caused by contact with another object. Various configurations can be adopted as long as contact with another object can be detected in the combined state. [5] It is also possible to attach the contact sensor 6 to the inside of the buffer, for example, by attaching the contact sensor 6 to the inner wall surface of the air tube 9. [6] When a gas or liquid fluid is used as the buffer means,
By configuring the contact sensor 6 to detect contact with another object by detecting the pressure of the fluid,
Without using a dedicated member as a contact of the contact sensor 6,
The buffer 5 may be configured to also serve as a component of the contact sensor 6. In such a configuration, when the pressure of the fluid inside the buffer 5 rises above a set value, the contact sensor 6 detects contact with another object, and drops below a predetermined pressure lower than the set pressure. At this time, it may be configured to detect that the fluid in the buffer 5 is leaking. [7] The above-described alarm device 7
Alternatively, or together with the alarm device 7, a required device such as the swivel 2 or a traveling device or an engine may be configured to be stopped.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a safety device is mounted on a work machine.

FIG. 2 is an explanatory diagram of the operation of the safety device.

FIG. 3 is a side view showing a state in which the safety device is mounted on a work machine.

[Description of Signs] 1 traveling body 2 turntable 5 shock absorber 6 contact sensor 7 alarm device 8 control device

Claims (3)

(57) [Claims] 1. A swivel (2) provided on a traveling body (1).
And a contact sensor (6) for sensing contact with another object such as a human body, and a shock absorber (5) for mitigating the impact so as to protect the human body from the impact at the time of contact. A work machine which is configured to activate an alarm device (7) based on a detection signal from the contact sensor (6) .
A safety device, wherein the buffer (5) is made of an elastic body filled with a fluid.
And at both sides and the rear of the swivel (2).
And the contact sensor is formed integrally over the entire length.
Operated in the contact direction based on the detection signal from (6)
Stop the operation of the turntable (3) or run in the contact direction.
Control to stop the traveling of the traveling aircraft (1).
A safety device for a working machine constituting the control device (8) . 2. The contact sensor (6) is formed in a belt shape.
And detects contact at any point along its length
So that the arrangement direction of the buffer (5)
The safety device for a work machine according to claim 1 , wherein the contact sensor (6) is arranged over a long period. Wherein the damping body (5), and an elastic body encapsulating gas, constituting the contact sensor (6), so as to detect a change in internal gas pressure of the cushion (5) do it
Safety device for a working machine of a claim 1, wherein.