JPH057749U - Safety equipment for construction machinery - Google Patents

Abstract

(57) [Summary] [Purpose] Since the operator's cab of the hydraulic excavator is provided in the front part of the upper swing body, the driver cannot see the lower rear part of the upper swing body. Further, when the upper revolving structure is rotated 180 °, the front part of the lower traveling structure cannot be visually observed.
Since the hydraulic excavator moves forward and backward in this state, workers nearby are extremely dangerous. An object of the present invention is to provide a traveling safety device that solves the above problems. [Structure] Sensor switches are provided on the front and rear of the undercarriage of the track-type construction machine, and the contactors of the sensor switches are located on the front side and the rear side of the front end of the track at positions separated from the track respectively. When the above sensor switch is not used, the contactor can be swiveled to the side or above the track, and when the construction machine is running, the contactor of the sensor switch is contacted by a person or obstacle. When it does, the construction machine is configured to stop running.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a traveling safety device equipped on a track-type construction machine such as a hydraulic excavator or a work vehicle.

[0002]

[Prior Art]

 FIG. 5 is a side view of a conventional hydraulic excavator. In the figure, 1 is an upper revolving superstructure of a hydraulic excavator, 2 is a driver's cab equipped on the upper revolving superstructure 1, 3 is a lower traveling body, 4 is a track frame of the lower traveling body 3, 5 is crawler tracks, 6L and 6R. Is a left and right traveling motor, 7 is a starting theory, and 8 is a floating theory. A crawler belt 5 is wound around the lower traveling body 3 of the hydraulic excavator. Further, the upper swing body 1 makes a full swing of 360 °.

Since the operator's cab 2 of the hydraulic excavator is provided in the front part of the upper revolving superstructure 1, the driver cannot see the lower rear part of the upper revolving superstructure 1. Even if the back mirror is attached to the rear part of the upper swing body 1, the rear end of the crawler belt 5 cannot be seen. When the upper revolving structure 1 is rotated 180 °, the front part of the lower traveling structure 3 cannot be seen. Since the hydraulic excavator moves forward or backward in such a state, it may collide with nearby workers or obstacles, which is extremely dangerous. The problems to be solved by the present invention are the above problems.

[0004]

[Problems to be solved by the device]

 The present invention provides a sensor switch at the front and rear of the undercarriage, and the sensor switches when the contactors of the sensor switch are set to the front side and the rear side of the front end of the track at positions separated from the track respectively. When the construction machine is running, set the sensor switch to the detectable position, and when the above-mentioned sensor switch is not used, the contact can be rotated and stored to the side or above the crawler belt. When the contactor of the sensor switch comes into contact with a person or an obstacle, the construction machine is stopped.

[0005]

[Means for Solving the Problems]

 FIG. 1 is a partially cutaway plan view showing a lower traveling body of a hydraulic excavator equipped with a safety device 9 of the present invention. In FIG. Attach. Reference numeral 3'denotes a lower traveling body whose left and right sides are symmetrical (illustrated by omitting the right side in FIG. 1), 10 is a bracket fixed to the side surface of the track frame 4, 11 is a sensor switch mounting bracket, Reference numeral 12 is a pin that pivotally supports the bracket 11 with respect to the bracket 10. Reference numerals 13 and 13 'are limit switches that are sensor switches provided in front of and behind the track frame 4, and 14 and 14' are L-shaped. These are contacts formed in the shape of a bar and protruding from the limit switches 13 and 13 '. FIG. 2 is a side view of the main part viewed from A in FIG.

FIG. 3 is a circuit diagram of the safety device 9 of the present invention. In the figure, 6L and 6R are left and right traveling motors, 15L and 15R are traveling switching valves for operating the traveling motors 6L and 6R, respectively, and 16, 17, 18 and 19 are various hydraulic actuators (ex. (Not shown) for controlling pilot switching valves, 20 and 21 for hydraulic pumps, 22, 22 'for electromagnetic open / close valves provided in the operating circuits of the traveling motors 6L, 6R, and 23, 23' for electromagnetic open / close valves. 22 and 22 'are solenoids, 13 and 13' are limit switches which are sensor switches, and 24 is a power source. FIG. 4 is a side view of an essential part showing a case where the contactor 14A is pivotally stored upward.

Next, the structure of the safety device 9 of the present invention will be described with reference to FIGS. Limit switches 13 and 13 'are provided on the front and rear of the truck frame 4 of the undercarriage 3', and the contactors 14 and 14 'of the limit switches 13 and 13' are attached to the front end of the crawler belt 5, respectively. The limit switches 13 and 13 'are set to be in the detectable state position when they are set to positions on the front side and the rear side of the rear end of the track separated from the crawler belt 5 by distances l and l' (shown in FIG. 1) respectively. When not using 13 and 13 ', the contactors 14 and 14' can be swiveled and housed laterally or upwardly of the crawler belt 5, and the limit switches 13 and 13 'are set to the detectable position to allow the hydraulic excavator to move. When traveling, the traveling of the hydraulic excavator is stopped when a person or an obstacle comes into contact with at least one of the contacts 14 and 14 'of the limit switches 13 and 13'. Configured to.

[0008]

【Example】

 Next, the operation of the safety device 9 of the present invention will be described. The limit switches 13 and 13 'of the contactors 14 and 14' are both accommodated in the crawler belt 5 laterally (in the direction of arrow C and HA 'in FIG. 1) or upward (in the direction of arrow D in FIG. 4). At times, the function of the safety device 9 is not exerted. That is, the action of the hydraulic excavator in that case is the same as that of the conventional technique. Next, the case where the hydraulic excavator runs with the limit switches 13 and 13 '(specifically, the contacts 14 and 14') set to the detectable position will be described. When the hydraulic excavator travels, the travel switching valves 15L and 15R are switched from the neutral position to the travel position. In this case, if neither a contact 14 nor 14 'is in contact with a person or an obstacle, both limit switches 13 and 13' have their contacts opened, and the solenoids 23 and 23 'of the solenoid valves 22 and 22' are Not energized. Since the electromagnetic on-off valves 22 and 22 'are at the open oil passage positions E and E, respectively, the hydraulic excavator runs. However, when a person or an obstacle is brought into contact with at least one of the contacts 14 and 14 'during the traveling (including the case where the traveling is started from the stop), the contact of the contacted limit switch is closed. Since the solenoids 23 and 23 'are energized, the electromagnetic on-off valves 22 and 22' are switched from the open oil passage positions E and E to the cutoff oil passage positions E and H ', respectively. The hydraulic shovel stops traveling because the operation circuits of the traveling motors 6L and 6R are cut off. This prevents the hydraulic excavator from colliding with nearby operators and obstacles.

In the circuit shown in FIG. 3 as an embodiment of the safety device 9 of the present invention, electromagnetic on-off valves 22 and 22 'are provided in the respective operating circuits of the left and right traveling motors 6L and 6R. However, a pilot operated traveling switching valve (not shown) may be arranged in the traveling switching valve, and an electromagnetic opening / closing valve may be provided in the pilot circuit.

[0010]

[Effect of the device]

 As described above, in the present invention, sensor switches are provided at the front and rear of the undercarriage of the tracked construction machine, and the contactors of the sensor switches are provided at the front and rear of the front end of the crawler track. When they are set apart from the crawler belts, they are set to the detection possible position of the sensor switch, and when the above sensor switches are not used, the sled contacts can be pivotally stored sideways or above the crawler belts to detect the sensor switch. When the construction machine is running in the possible position, the construction machine is configured to stop running when a person or obstacle contacts the contact of the sensor switch. As a result, when a construction machine moves forward or backward at a work site where a worker is working near a track-type construction machine, or a work site where structures that must not be damaged are erected on the ground. It is safe and prevents collision accidents. Further, when the construction machine is not working, the contact of the sensor switch can be housed by turning, which is convenient.

[Brief description of drawings]

FIG. 1 is a partial cutaway plan view showing a lower traveling body of a hydraulic excavator having a safety device according to the present invention.

FIG. 2 is a side view of a main part viewed from A of FIG.

FIG. 3 is a circuit diagram of a safety device according to the present invention.

FIG. 4 is a side view of an essential part showing a case where the contact of the sensor switch according to the present invention is housed so as to be rotated upward.

FIG. 5 is a side view of a conventional hydraulic shovel.

[Explanation of symbols]

 1 Upper revolving structure 3,3 'Lower traveling structure 4 Track frame 5 Tracks 6L, 6R Traveling motor 9 Safety device 13, 13' Limit switch 14, 14 ', 14A Contact 22, 22' Electromagnetic on-off valve

Claims (1)

[Claims for utility model registration] [Claim 1] Sensor switches are provided at the front and rear of the undercarriage of a track-type construction machine, and the contactors of the sensor switches are attached to the front and rear ends of the front end of the track. The sensor switch is set in the detectable state position when set to a position apart from the crawler belt on the rear side, and when the sensor switch is not used, the contact can be swiveled to the side or above the crawler belt and stored. When the construction machine is traveling in the position where the vehicle can be detected, the construction machine is configured so that the traveling of the construction machine is stopped when a person or an obstacle comes into contact with the contact of the sensor switch. apparatus.