KR100674120B1 - Hang-up equipment for hydraulic excavator - Google Patents

Abstract

In the hydraulic shovel having a hooking port at the tip of the working machine and satisfying the movable crane specification, a hooking device safety device for preventing damage caused by forgetting to store the hooking hole is provided. If the hook 1 mounted on the bucket is in the excavation mode when it is not stored at the predetermined position, the proximity switch 8 installed at the storing position detects this and excites the solenoid valve 16. As a result, the pilot circuit to the dump side of the main valve 13 which drives the bucket cylinder 3 is interrupted, and the rotation of the bucket cylinder in the dump direction is inhibited. In addition, the alarm device may be activated when the hook 1 is in the unopened excavation mode.

Description

 HANG-UP EQUIPMENT FOR HYDRAULIC EXCAVATOR}             

1 is a side view showing a state where the hook tool of the hydraulic shovel is stored at a predetermined position.

2 is the Z approach of FIG.

Figure 3 is a circuit diagram showing an example of a bucket cylinder hydraulic circuit with a hook mechanism safety device of the present invention.

4 is an explanatory diagram of logic related to excitation or elements of a solenoid valve provided in a pilot hydraulic circuit on the main valve side of a bucket cylinder.

Figure 5 is a side view of a conventional hanger attached to the tip of the hydraulic shovel bucket.

Explanation of symbols on the main parts of the drawings

1: hook 3: bucket cylinder

4: bucket 5: ring

7: fixed pin 8: proximity switch

13: Main valve for bucket cylinder                 

16: solenoid valve 17: controller

18: monitor panel 19: crane mode switch

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook safety device for a mobile crane part hydraulic shovel in which a crane function is added to a hydraulic shovel.

Hydraulic shovels are widely used for road works, water and sewage works, building foundation works, land construction, and gravel and soil collection. In particular, the horizontal plane within the 360 ° boom pivotable upper frame (旋回體) in, because it has a long working machines Reach (reach), known as cancer, wire, etc. walked to the working machine fleet of, in addition to the original operations bucket (bucket) The construction materials were raised and used as emergency substitutes for cranes. But. Hydraulic shovels are not suitable for such operations because they do not have the capability to safely carry out unloading operations.

Other uses of construction machinery, etc., are strictly regulated under the Labor Safety and Sanitation Regulations. However, the law was amended in October 1992 to lift cargo and prevent soil from falling down under certain conditions. It is designed to be able to insert, pull out. However, unloading work on hydraulic shovels will not be accepted except when it is inevitable due to the nature of the work or when it is necessary for the safe work. On the other hand, in order to improve the safety of the unloading operation by the hydraulic shovel, the hydraulic shovel which satisfies the movable crane specification was developed. This hydraulic shovel generally functions as a small mobile crane with a load of less than 3 tonnes. It can be used for two kinds of uses, such as lifting and lifting loads and excavation and loading operations such as earth and sand.

 5 shows an example of a hook tool provided on a hydraulic shovel that satisfies the mobile crane specification. The piston rod end of the bucket cylinder 3 is connected to the bucket 4 via two parallel rings 5. The hook 1, which is a hook, has an anti-falling 2 in the opening, and is mounted so as to be free to rotate according to the rotation of the pin 6 connecting the bucket 4 and the ring 5 to each other. When the hook tool is not used, the hook 1 is rotated upwards and stored between the two rings 5. At this time, the hook 1 is fixed between the ring 5 by inserting a fixing pin into the pin hole 5a provided in the ring 5 and the inner side of the curved part of the hook 1.

When carrying out the unloading operation on the hydraulic shovel, extend the bucket cylinder to the maximum so that the bucket is at the excavation side limit position. Pull out the retaining pin to release hook 1 from the storage position and press the crane mode switch installed near the driver's seat. When the switch is pressed, the pilot hydraulic circuit reaching the dump of the bucket cylinder main valve is cut off, and the bucket does not move even when the bucket operating lever is operated to the dump side. Therefore, damage to hooks or hook articles by the bucket is prevented. On the other hand, when shifting from hook unloading work to excavation and loading work. Press the crane mode switch again to change from crane mode to excavation and loading mode. As a result, the interruption of the by-pass hydraulic circuit reached at the dump side of the bucket cylinder main valve is released, and the bucket is free to rotate to both the excavation side and the dump side.

However, the conventional hydraulic shovel has the following problems. In other words. By changing from the crane mode to the excavation / loading mode, it becomes possible to perform normal excavation / loading operation even if the hook is not stored at the predetermined position shown in FIG. Attaching a nameplate that mandates the hook to be stored, or urging attention to the instructions in the instruction manual, the bucket operates normally when the hook is switched to the excavation / loading mode even when unhooked. The hook may be damaged by the loading operation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in a hydraulic shovel having a safety device that satisfies a movable crane specification. It is an object of the present invention to provide a hook safety device for a hydraulic shovel that can prevent the hook from being damaged by carrying out excavation and loading work without forgetting to store the hanger attached to the tip of the work machine.

In order to achieve the above object, the first of the hydraulic latch safety device of the hydraulic shovel according to the present invention, in the hydraulic shovel having a hook on the front end of the working machine, detecting the hook when the hook is stored in a predetermined position When the means and the storing of the said latching tool in the predetermined position are not detected. It is characterized by including a work machine control means for suppressing the movement of the work machine which may burn the hanger.                     

The conventional hydraulic shovel provided with a safety device that satisfies the movable crane specification is designed to be a movement of a work machine that may damage the hooking tool when the crane mode is set. The present invention adds a judgment based on the detection result of whether or not the hook is in the storage position by this function. According to the above configuration, when the storage of the hook is not detected, the movement of the work machine, which may damage the hook, is inhibited even when switching from the crane mode to the excavation mode. We notice that we are and store in the right position. As a result, damage to the hook tool is avoided, and the hook unloading work can be safely performed.

 Moreover, in the 2nd hanger safety device of the hydraulic shovel which concerns on this invention, the hanger attached to the bucket used as a work machine is stored in the predetermined position in the 1st of the hanger safety device of the said hydraulic shovel. When not. It is characterized in that it is provided with a control means for detecting this and inhibiting rotation in the dump direction of the bucket.

 According to the said structure, even if it tries to shift to an excavation and loading operation, forgetting to store a hanger, a bucket does not move to a dump direction. Therefore, the recognition that the hook tool is not stored and the prevention of the damage of the hook tool are reliably performed, whereby the safety of the hook unloading operation by the hydraulic shovel is remarkably improved.

The third hanger safety device for a hydraulic shovel according to the present invention is a hydraulic shovel provided with a safety device that satisfies a movable crane specification, and has a hooking port at the tip of the work machine, in which the hooking port is not stored. When the control device is switched from the crane mode to the excavation mode by operating the control device, it is characterized in that the alarm device indicating that the hook is not stored.

According to the above configuration, since the alarm device is operated when the hooking mechanism is put into the excavation mode without storing the hooking tool, the driver recognizes that the hooking of the hooking tool is forgotten before the hydraulic shovel is operated. Thereby, the damage of the hook tool by an excavation work can be prevented beforehand. The alarm device may be either a buzzer or a lamp. In addition. It may be a configuration in which only the alarm device operates, or a configuration in which the alarm device is activated and the movement of the work machine is inhibited again.

Next, a description will be given of an embodiment of a hook opening safety device for a hydraulic shovel according to the present invention with reference to the drawings.

FIG. 1: is a side view which shows the state in which the hook 1 which is a hook tool is stored in the predetermined position, and FIG. 2 is the Z view of FIG. The hook 1 has a peel-off prevention tool 2 in the opening part, and it is attached so that rotation is free by rotation of the pin 6 which connects the two rings 5 and 5 which interpose between the bucket cylinder 3 and the bucket 4 to the bucket 4. In addition, when not using the hanger, the hook 1 is stored between the said rings 5 and 5, and is fixed by the fixing pin 7 inserted into the inner side of the curved part of the hook 1, and the rings 5 and 5 and.

The proximity switch 8 is attached to the inner surface of one ring 5. When the hook 1 is stored, the switch is turned on because the curved portion of the hook 1 is close to the proximity switch 8. In addition, when the hook 1 is removed from the storing position, the proximity switch 8 is turned OFF. And a limit switch may be used instead of the proximity switch.

Next, a hydraulic circuit for preventing damage to the hook will be described with reference to FIG. 3. Fig. 3 shows an excerpt of the circuit related to the bucket cylinder among the hydraulic circuits for driving the respective hydraulic actuators of the hydraulic shovel.

Among the pilot valves for switching between the bucket operation and the dump operation, the pilot circuit 12 of the excavation side pilot valve 11 is directly connected to the excavation side of the main valve 13 for the bucket cylinder. On the other hand, the pilot circuit 15 of the dump side pilot valve 14 is connected to the dump side of the bucket cylinder main valve 13 via the solenoid valve 16. In addition, the detection data of the boom / angle angle sensor, the boom cylinder pressure sensor, and the entry / disconnection data of the proximity switch 8 installed at the hook 1 storage position are installed in the controller 17 to safely carry out the hook unloading operation. Is displayed on monitor panel 18. The output wiring of the controller 17 is connected to the solenoid of the solenoid valve 16, and the crane mode switch 19 is provided to the controller 17.

The logic of the excitation or element by the controller 17 with respect to the solenoid valve 16 will be described with reference to FIGS. 4 and 3. Incidentally, although the logic of the conventional excitation or element is an element when the crane mode switch: ON is excited, and the element is OFF, in the present embodiment, the excitation or the combination of the crane mode switch ON and OFF and the proximity switch ON and OFF is performed. The device is determined.

(1) Crane mode switch: ON, proximity switch: ON

  Excitation current flows from the controller 17 to the solenoid valve 16 in the crane mode but with the hooks stored. Therefore, the solenoid valve 16 is switched to the opposite side to the position shown in FIG. 3, and even if the bucket operation lever is operated to the dump side, the pilot pressure does not act on the dump side of the main valve 13 for the bucket cylinder.

 (2) Crane mode switch: ON, proximity switch: OFF

 It is in crane mode and hook is not stored. That is, the state at the time of unloading work. As in (1), excitation current flows from the controller 17 to the solenoid valve 16.

 (3) Crane mode switch: OFF, proximity switch: OFF

  It is in excavation mode, but the hook is not stored. Since the hook is not contained, dumping of the bucket is not preferable. Therefore, an excitation current flows from the controller 17 to the solenoid valve 16 as in (1).

(4) Cray Mode Switch: OFF, Proximity Switch: ON

  Excitation current is not flown from the controller 17 to the solenoid valve 16 because it is in the excavation mode and the hook is stored. Therefore, the solenoid valve 16 is switched to the position shown in FIG. 3, and the dump side pilot valve 14 pilot pressure acts as the dump side of the bucket cylinder main valve 13 via the solenoid valve 16. FIG.

 When switching from the crane mode to the excavation mode as described above, a mechanism is installed in which the bucket 4 does not move to the dump side if the hook is not properly stored in the storage position. do. Therefore, it is possible to prevent the hook 1 from being damaged by interfering with the bucket 4, the earth and the like.                     

 The above embodiment is a conventional hydraulic shovel which satisfies the movable crane specification. However, in the crane mode, the drive to the dump side of the bucket cylinder 3 is inhibited, thereby preventing the breakage of the hook 1. The detection result at the hooking position is added. However, it is not limited to such a structure, It is good also as a structure which restrains the movement of an arm cylinder or a boom cylinder, when a hanger is not stored in a predetermined position.

The alarm device may be placed in monitor panel 18, or may be placed in another location in the cab, for example, at the corner of the bottom window which does not obstruct the clock if the alarm lamp is close to the driver's side of the cab side wall. Alternatively, it may be provided outside the cab so that the worker working near the hydraulic shovel may be informed. The detection result of the proximity switch 8 may be input directly to the solenoid valve 16 without inputting the controller 17, or the alarm device may be activated.

(The components of the invention are described together with the effects of the invention.)

Claims (3)

In a hydraulic shovel having a hook at the distal end of a work machine, means for detecting when the hook (1) is stored at a predetermined position (8) and storage of the hook (1) at a predetermined position are detected. And a work implement control means for restraining the movement of the work machine, which may damage the hanger (1) when not in use. The method of claim 1, When the hooking mechanism 1 attached to the bucket 4 used as a work machine is not stored in a predetermined position, it is provided with the control means which detects this and suppresses rotation to the dump direction of the said bucket 4, Hanger safety device of hydraulic shovel characterized by. In a hydraulic shovel having a safety device that satisfies a movable crane specification and having a hook at the distal end of the work machine, the control device without the hook 1 being stored. An alarm device for a hydraulic shovel, characterized in that, when operating from (17) to switch from crane mode to excavation mode, an alarm device indicating that the hook tool (1) is not stored is operated.

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