JP2003020689A - Handrail for civil engineering/construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a handrail prevented from interfering with an attachment and greatly extended from a housing for easy operation. SOLUTION: In the civil engineering/construction machine having a housing covering an engine, a hydraulic apparatus and the like arranged on an upper structure, this handrail for operation is arranged in the outer circumference upper part of the housing, a housing place for housing the handrail is arranged on one end side of the upper structure, and a hydraulic cylinder is arranged for moving the handrail freely between a working position and the housing position.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a handrail for civil engineering and construction machinery.

[0002]

2. Description of the Related Art Conventionally, a handrail of a civil engineering / construction machine is held by a handrail when an operator or a serviceman climbs up or down a house in order to perform safe ascent / descent in maintenance of engines and hydraulic equipment. belongs to. Therefore, conventionally, a step is provided on the front side of the house on the side opposite to the cab with the attachment mounting portion sandwiched therebetween, and a hand rail is directly fixed to the house by welding on the upper portion thereof, or fixed by bolts and nuts. Also, from the viewpoint of preventing interference with the attachment and appearance, the handrail was installed along the periphery of the house without being greatly projected from the house.

However, since the above-mentioned conventional handrail is short, it is necessary to curl up and down when moving up and down the house. When climbing onto the house and performing maintenance work on the engine and hydraulic equipment, use the handrail. It is difficult to grab and work, and since the handrail is installed around the house, if the worker slips on the house, the worker will trip over the handrail and fall from the house, which is dangerous on the contrary. There are cases.

In addition, Japanese Unexamined Patent Publication (Kokai) No. 8-2775
As described in (46), there is also a structure in which a part of the handrail is vertically movable. In this conventional device, it is necessary for an operator to move the movable part of the handrail up and down, and if the movable part is enlarged for manual operation, the operation becomes difficult, and if it is smaller, the fixed protruding part is fixed. Is increased, and there is a risk that the attachment of the work machine comes into contact with the work.

Particularly in civil engineering / construction machines in which the arms are offset, such as a gutter excavator, in the conventional handrail, the attachment and the handrail may interfere when the handrail is largely projected from the periphery of the house. This may lead to damage to the handrail and further damage to the house. On the contrary, if the handrail is too close to the house, the work becomes difficult to perform. In addition, there is a problem that the handrail is projected from the house, which causes poor viewing.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned fact, and an object thereof is to store the handrail during work when the handrail is not used to prevent interference between the attachment and the handrail, An object of the present invention is to provide a handrail in which the handrail is greatly projected from the house when climbing above the house for maintenance of the hydraulic equipment, when performing maintenance above the house, and when descending from the house to facilitate the work. .

[0007]

The present invention adopts the following configuration as means for solving the above problems. That is, the invention according to claim 1 is a civil engineering / construction machine provided with a house covering an engine, hydraulic equipment, etc. arranged on an upper swing body, and a handrail for work is provided above the outer periphery of the house. A storage place for storing the handrail is provided on one end side of the upper swing body, and a hydraulic cylinder for freely moving the handrail between a working position and a storage position is provided. .

The invention described in claim 2 is the same as claim 1.
In the invention described above, the storage of the handrail is configured such that a storage place is provided below a working position of the handrail, and the handrail is connected to a rod tip portion of the hydraulic cylinder so as to be movable up and down. The hydraulic cylinder is provided inside the house. Here, “upper and lower” is not limited to “vertical up and down” and includes diagonal up and down directions.

The invention described in claim 3 is the same as claim 1
Alternatively, in the invention of claim 2, the storage location of the handrail is characterized in that the upper surface of the handrail is substantially aligned with the upper surface of the house when the handrail is stored.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, a start detector for detecting the start of the engine and a position detector for detecting the position of the handrail are provided. When the start detector detects the start of the engine and the position detector detects that the handrail is in the working position, the controller includes a controller that moves the handrail to the storage position. There is.

The invention described in claim 5 is the same as claim 1.
According to the present invention, an operation detector for detecting the operation of the operation lever and a position detector for detecting the position of the handrail are provided, and the operation detector detects the operation of the operation lever, and When the position detector detects that the handrail is at the working position, the controller is equipped with a controller that moves the handrail to the storage position.

The invention according to claim 6 is the same as claim 1.
The invention according to claim 3, wherein an attachment detector for detecting the position of the attachment, a position detector for detecting the position of the handrail, the attachment detector and the attachment from the position detector to the handrail. An arithmetic unit for detecting proximity is provided, and a controller for moving the handrail to the storage position when the arithmetic unit detects proximity is provided.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a side view of a hydraulic excavator adopting this embodiment, and FIG. 2 shows a plan view thereof. 3 is a diagram showing a handrail storage state according to the embodiment of the present invention, and FIG. 4 is a diagram showing a state where the handrail according to the embodiment of the present invention is extended. FIG. 5 is an electrohydraulic circuit diagram according to the embodiment of the present invention, and FIGS. 6 and 7 are electrohydraulic circuit diagrams according to other embodiments of the present invention.

In FIGS. 1 and 2, reference numeral 1 denotes a lower traveling body, and an upper revolving superstructure 2 is rotatably mounted on the lower traveling body 1. A cab 3 is arranged on the left front part of the upper revolving structure 2, and a house 4 for covering the engine and hydraulic equipment is provided from the rear of the cab 3 to the right front part of the upper revolving structure 2 and behind the house 4. Is provided with a counterweight 5. An attachment 6 is attached to a central front portion of the upper swing body 2 by a boom cylinder 7 so that the attachment 6 can be lowered and raised.

A boom potentiometer 33 for detecting a boom angle is attached to a pivotal attachment portion (boom foot) of the upper swing body 2 and the base boom 6a, and a base portion is attached to a pivotal attachment portion of the base boom 6a and the lateral bending boom 6b. Boom 6
An offset potentiometer 34 for detecting the relative angle of the lateral bending boom 6b with respect to a is attached, and an arm potentiometer for detecting the relative angle of the arm 6d with respect to the offset arm 6c is attached to the pivot arm of the offset arm 6c and the arm 6d. ing. A position detector 40 that detects the position of the handrail 11 is provided on the upper surface of the house 4 (see FIG. 4). The position detector 40 may be composed of a micro switch and may detect that the handrail 11 is in the retracted position. The outputs of the potentiometers 33 to 35 and the position detector 40 are input 32 to a controller described later.

In FIGS. 3 and 4, a hydraulic cylinder 8 is vertically fixed by bolts 9 and nuts 10 on the inner surface of the house 4. A plate 8b for fixing the handrail 11 is fixed to the tip of the rod 8a of the hydraulic cylinder 8. The plate 8b is fixed to the plate 11a fixed to the handrail 11 with bolts 12 and nuts 13. A guide 14 is fixedly installed on the inner surface of the house 4 in parallel with the hydraulic cylinder 8.
A guide bar 15 is slidably mounted inside, and a plate 15a for fixing the handrail 11 is fixed to the tip of the guide bar 15. The plate 15a is a plate 11b fixed to the handrail 11 and a bolt 1
6 and fixed by a nut 17.

In FIG. 5, reference numeral 18 denotes a pilot hydraulic pump, the pilot hydraulic pump 18 is connected to a remote control valve 19 by a conduit 20, and one position 19a of the remote control valve 19 is connected by a pilot conduit 21 to the main directional control valve 2.
The second position 19b is connected to the pilot port 22a of the main direction switching valve 22 by the pilot line 23. The upstream side of the main direction switching valve 22 is connected to the main hydraulic pump 24, and the downstream side of the main direction switching valve 22 is connected to the actuator 25.

A branch line 26 from the pipe line 20 of the pilot hydraulic pump 18 is connected to a P port of a solenoid valve 28 via a check valve 27, and an A port of the solenoid valve 28 is on the bottom side of the hydraulic cylinder 8. Solenoid valve 28 in oil chamber 8c
B port is the top side oil chamber 8d of the hydraulic cylinder 8.
Further, the T port of the solenoid valve 28 is connected to the tank 29, respectively. Then, the solenoid 28 of the solenoid valve 28
a is connected to the power supply 31 via the switch 30.

FIG. 6 shows another embodiment circuit example.
In FIG. 6, the solenoid 28 a of the solenoid valve 28 is connected to the controller 32. In addition to the inspection work push button 36, the controller 32 includes a boom potentiometer 3
3, the outputs of the offset potentiometer 34 and the arm potentiometer 35 are connected. The controller 32 is composed of an arithmetic unit having a storage unit, an arithmetic unit, etc.,
In the storage unit of the controller 32, the base boom 6a,
Side-bending boom 6b, offset arm 6c, arm 6d
And the positional relationship between the bucket 6e and the potentiometer 33-
An arithmetic expression or a data relationship indicating the relationship of 35 is recorded. From the detected values of the boom potentiometer 33, the offset potentiometer 34, and the arm potentiometer 35, the position of the tip of the bucket 6e or the position of the arm 6d and the pivotal joint of the bucket 6e is calculated by the calculation unit of the controller 32.

Data indicating the relationship between the detection data of the position detector 40 and the position of the handrail 11 is recorded in advance in the storage section of the controller 32. The position detector 40 may be configured by, for example, a micro switch and turned on when the handrail 11 is in the storage position and turned off when the handrail 11 is in the working position. Also,
The controller 32 may store position data at the work position of the handrail 11 in the storage unit. Furthermore,
The controller 32 includes a start detector 41 that detects the start of the engine and an operation detector 42 that detects the operation of the operation lever.
You may connect the output terminal of. The start detector 41 may detect when the engine key is turned on. The operation detector 42 may be configured to detect when either the boom 6a, the arm 6b, or the bucket 6e is operated, that is, when any one of these remote control valves 19 is operated.

In FIG. 7, the main hydraulic pump 24 is used as the hydraulic source of the hydraulic cylinder 8 instead of the pilot hydraulic pump 18, except that the branch pipe 39 downstream of the main hydraulic pump 24 is connected to the check valve 27. It is the same as FIG. Further, FIG. 8 shows an example in which the handrail 11 is projected outside the house by a slight distance. 8A is a side view and FIG. 8B is a plan view. As shown in the figure, one ends of the horizontal members 37 and 38 are fixed to the handrail 11 by welding or the like, and the other ends are fixed to the plates 11a and 11b. The horizontal members 37, 38 are provided with pivoting portions at their base ends so that they can be bent outward at a predetermined angle in the lateral direction.
It may be configured to be bent outward during work and vertical when stored.

Next, the operation of this embodiment will be described. In FIG. 5, when an engine key switch (not shown) is turned on to enable working, and at the same time when the switch 30 is turned on, the solenoid 28a of the solenoid valve 28 is energized from the power source 31 and the solenoid valve 28 is in the position (b). Is switched to. Then, the pressure oil of the pilot hydraulic pump 18 is led from the branch pipe line 26 to the top side oil chamber 8d of the hydraulic cylinder 8 via the P port and the B port of the solenoid valve 28, and the hydraulic cylinder 8 is contracted and the handrail 11 To store. Therefore, when the attachment 6 is operated, the handrail does not interfere with the attachment, and the work can be performed safely.

On the other hand, when the switch 30 is turned off, the solenoid 28a of the solenoid valve 28 is not energized from the power source 31 and the solenoid valve 28 is held in the position (a). Therefore, the pressure oil of the pilot hydraulic pump 18 is led from the branch conduit 26 to the bottom side oil chamber 8c of the hydraulic cylinder 8 via the P port and the A port of the solenoid valve 28, and the hydraulic cylinder 8 is extended and the handrail 11 Stick out. After that, the operator turns off the engine key switch and exits the driver's cab, and the handrail 11 on the front right side of the house 4
Grab it and climb up onto the house 4 to inspect and repair the engine or hydraulic equipment. At that time, the handrail 11 is held in an overhang state by the check valve 27's backflow prevention function. It is possible to perform inspection / repair by grasping the handrail 11 or leaning on the handrail 11 for safe inspection / repair.

Next, FIG. 6 is a view for explaining an example of automatically storing the handrail 11 by detecting that an attachment such as a bucket approaches the handrail 11. When the inspection work or the like is started, if the inspection work push button 36 is pressed after the hydraulic pump is started (after the engine key is turned on), the solenoid valve 28 switches to the position (a) state, and the pilot hydraulic pump The pressure oil 18 is led from the branch conduit 26 to the bottom side oil chamber 8c of the hydraulic cylinder 8 via the P port and the A port of the solenoid valve 28, and extends the hydraulic cylinder 8. Therefore, the handrail 11 is in an extended state and this state is maintained. When the push button 36 is pressed again after the inspection work is completed, the solenoid valve 28 is switched to the position (b) and the hydraulic cylinder 8
Hydraulic pressure is led to the rod side oil chamber 8d of the hydraulic cylinder 8
Is reduced, and the handrail 11 returns to the storage position.

When the attachment 6 such as the bucket 6e approaches the handrail 11 with the handrail 11 overhanging, the position of the tip of the bucket 6e or the pivot point of the arm 6d and the bucket 6e is calculated by the calculation unit of the controller 32. Then, when the distance between the tip of the bucket 6e or the arm 6d and the pivot point of the bucket 6e and the handrail 11 becomes equal to or less than a predetermined length, a signal is derived from the controller 32 to the solenoid 28a of the solenoid valve 28. 28 can be switched to the position (b). At this time, the pressure oil of the pilot hydraulic pump 18 is guided from the branch pipe line 26 to the top side oil chamber 8d of the hydraulic cylinder 8 via the P port and the B port of the solenoid valve 28, and the hydraulic cylinder 8 is contracted to reduce the hand pressure. The rail 11 is stored. Thereby, even if the user forgets to return the handrail 11 to the storage position, the interference between the attachment 6 and the handrail 11 is avoided.

In FIG. 7, the pressure oil of the main hydraulic pump 24 is introduced into the hydraulic cylinder instead of the pilot hydraulic pump 18 in FIG. 6, and the others are the same as in FIG.

In the above embodiment, the switch 30
Is turned on or off or the push button 36 is pressed to switch the solenoid valve 28 to move the handrail 11 to the working position or the storage position. Further, the handrail 11 can be stored by detecting the attachment 6 approaching the handrail 11 and switching the solenoid valve 28. However, the start / stop of the engine or the operation of the operation lever is detected. It is also possible to store the handrail 11 by using it. Although the embodiments of the present invention have been described in detail above with reference to the drawings, the technical scope of the present invention is not limited thereto. For example, the hydraulic cylinder may be installed with a slight inclination toward the outside of the side surface.

[0028]

As can be understood from the structure described in detail in the above embodiment, the present invention enables the handrail to be extended and stored by means of a hydraulic cylinder, and the handrail can be used when inspecting and repairing the engine and hydraulic equipment. Since it is possible to raise and lower, as well as inspect and repair the house by overhanging and grasping this overhanging handrail, it is possible to safely and easily raise and lower the house, inspect and repair, and the handrail can be stored during work, so that the It is extremely effective in preventing interference between the attachment and the handrail.

[Brief description of drawings]

FIG. 1 shows a side view of a hydraulic excavator adopting the present invention.

FIG. 2 is a plan view of a hydraulic excavator adopting the present invention.

FIG. 3 shows a stored state of the handrail according to the embodiment of the present invention.

FIG. 4 shows a handrail overhanging state according to the embodiment of the present invention.

FIG. 5 is an electrohydraulic circuit diagram according to the embodiment of the present invention.

FIG. 6 is an electrohydraulic circuit diagram according to another embodiment of the present invention.

FIG. 7 is an electrohydraulic circuit diagram according to another embodiment of the present invention.

FIG. 8 shows an example of a case where the handrail is projected outward from the side surface.

[Explanation of symbols]

4 House 8 Hydraulic Cylinder 11 Hand Rail 14 Guide 15 Guide Bar 18 Pilot Hydraulic Pump 19 Remote Control Valve 22 Main Direction Switching Valve 24 Main Hydraulic Pump 28 Solenoid Valve 30 Switch 32 Controller 33 Boom Potentiometer 34 Offset Potentiometer 35 Arm Potentiometer 36 Push Button 40 Micro Switch (handrail position detector)

Claims (6)

[Claims] 1. A civil engineering / construction machine provided with a house for covering an engine, hydraulic equipment, etc. arranged on an upper swing body,
A handrail for work is provided above the outer periphery of the house, a storage place for storing the handrail is provided on one end side of the upper revolving structure, and the handrail can be freely moved between a working position and a storage position. A handrail for civil engineering and construction machinery, which is equipped with a hydraulic cylinder for moving it. 2. The handrail storage is configured such that a storage place is provided below a working position of the handrail, and the handrail is connected to a rod tip portion of the hydraulic cylinder so as to be movable up and down. The handrail for civil engineering and construction machinery according to claim 1, wherein the hydraulic cylinder is provided inside the house. 3. The storage location of the handrail is configured such that an upper surface of the handrail substantially coincides with an upper surface of the house when the handrail is stored. The handrail for civil engineering and construction machinery described in any one of 2. 4. A start detector for detecting the start of the engine, and a position detector for detecting the position of the handrail, wherein the start detector detects the start of the engine, and
4. The controller according to claim 1, further comprising a controller that moves the handrail to a storage position when the position detector detects that the handrail is at a working position. Handrails for civil engineering and construction machinery. 5. An operation detector for detecting the operation of an operation lever and a position detector for detecting the position of the handrail are provided, and the operation detector detects the operation of the operation lever and the position detector. A controller for moving the handrail to the storage position when it is detected that the handrail is at the working position of the handrail.
The handrail for civil engineering and construction machinery according to claim 1. 6. An attachment detector for detecting the position of an attachment, a position detector for detecting the position of the handrail, and the attachment detector and the fact that the attachment is close to the handrail from the position detector. An arithmetic unit for detecting is provided, and when the arithmetic unit detects proximity, the controller further comprises a controller for moving the handrail to a storage position. Handrails for civil engineering and construction machinery.