JP3501110B2 - Work machine with elevator cab - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine for operating a lifting magnet used for scrap dismantling work or a crushing device provided at the tip of an arm to perform crushing work, and more particularly to a lifting type cab so-called elevator. The present invention relates to a working machine equipped with a cab.

[0002]

2. Description of the Related Art This type of work machine has basically the same structure as a hydraulic excavator, but it is easy to dismantle scraps such as automobiles by attaching, for example, a crushing device instead of the bucket provided at the tip of the front attachment. In addition, the operator's cab is constructed in an elevating manner for the purpose of ensuring a good working field when piled up scraps that have been dismantled.

According to this working machine, since the operator's cab can be moved up and down according to the height of the work target, it is possible to work while always ensuring a good working field of view. In the current lift-type operator's cab, it is possible to move up and down within a range of about 3 m from the boarding / alighting position (storage position) to the maximum lift limit.

On the other hand, if the operator's cab is raised and lowered frequently,
It may be illusion that the driver's cab has returned to the entry / exit position even though the driver's cab has not completely descended to the entry / exit position. Will be done.

Therefore, in the working machine provided with such a lifting type cab, safety measures are taken so that the operator does not accidentally get out of the cab while the cab is raised. As safety measures, for example, (a) a limit switch detects that the cab has risen from the entry / exit position and turns on a warning lamp in the cab, and (b) a cab door when the cab is raised. There is one that sounds an alarm buzzer when is opened.

[0006]

[Problems to be Solved by the Invention]
The method of turning on the warning lamp of (a) has a problem that an unnecessarily warning is given even when the operator has no intention of descending because only the rise of the cab is detected. With the buzzer sounding method, an alarm is issued after the door is opened, so the warning timing is late, and when the operator opens the door to give instructions to outside workers, the alarm buzzer will continue to sound. There are also inconveniences.

The present invention has been made in consideration of the above-mentioned problems in the conventional working machine with a lifting cab, and at an appropriate timing, an operator is alerted at a rising position of the cab to prevent falls or falls. The present invention provides a working machine with a lifting cab that can be notified.

[0008]

The present invention according to claim 1 is configured so that the operator's cab can be raised from the entry / exit position to the work position in accordance with the height of the work object, and the work device can be operated with a good field of view. In the working machine with a lifting cab, the cab position detecting means for detecting that the cab has risen from the boarding / alighting position, the operation stop detecting means for detecting an operation stop of the working machine, and the both detecting means. A lifting-type working machine with a driver's cab, comprising: an alarm notifying means for issuing an alarm when both the raising of the operator's cab and the stoppage of the operation of the working machine are detected.

The present invention according to claim 2 is a working machine with an elevator cab capable of detecting the above-mentioned operation stop by operating a boarding / alighting blocking lever provided on a boarding / alighting side of a driver's seat to a blocking release position. is there.

According to the third aspect of the present invention, the alarm notification means is configured to perform one or more of audio notification, visual notification, and vibration notification. Is.

According to a fourth aspect of the present invention, there is provided a working machine with an elevator cab, wherein the alarm notifying means has a timer and is configured to give an alarm for a predetermined period.

The present invention of claim 5 is a working machine with an elevator cab, wherein the alarm notifying means includes a stop switch for stopping alarm notification.

According to the first aspect of the present invention, for example, when the operator raises the cab when carrying out scrap stacking work, first, the cab position detecting means detects that the cab has risen. In this state, that is, when the operation of the work machine is stopped while the cab is located at a high place,
The operation stoppage detecting means detects the operation stoppage. When both the rise of the driver's cab and the stoppage of the operation are detected, the alarm notifying means gives an alarm. As a result, if the operator stops the operation and accidentally tries to get out of the operator's cab while the operator's cab is raised, an alarm is issued before the door is opened.

Therefore, by issuing an alarm to the operator at an appropriate timing, it is possible to reliably prevent the operator from stepping off or dropping the foot from the cab.

According to the second aspect of the present invention, the operation stop is detected by operating the entry / exit cutoff lever to the disconnection release position. Therefore, a new structure is not added to detect the operation stop. Existing configurations can be used.

According to the third aspect of the present invention, the alarm notifying means performs one or more of voice notification, visual notification, and vibration notification. The alarm can be reliably recognized.

According to the present invention of claim 4, the alarm notification stops after a certain period of time elapses. Therefore, for example, when the operator takes a break in the driver's cab, the operator accidentally touches the operation lever or the like to malfunction the working machine. The alarm notification can be stopped for a fixed period even if the operation is stopped by pulling up the boarding / alighting blocking lever for the purpose of not causing it.

Further, for example, if only the voice notification is controlled by the timer and the visual notification is continued, the alarm does not become an obstacle when taking a break and the state where the driver's cab is raised is maintained. The operator can be notified.

According to the fifth aspect of the present invention, when the operator outside the driver's cab is contacted, the alarm is issued once when the boarding / alighting shutoff lever is pulled up, but the operator is willing to issue the alarm. Since it can be stopped, the contact can be made quickly without being disturbed by the alarm.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the embodiments shown in the drawings.

FIG. 1 shows a side view of a working machine with an elevator cab according to the present invention (hereinafter abbreviated as working machine).

In the figure, the working machine 1 has a lower traveling body 2, and an upper rotating body 3 is rotatably mounted on the lower traveling body 2. A work attachment 4 capable of swinging in the vertical direction is provided at the front part of the upper swing body 3, and an engine room 5 is formed at the rear part.

An elevating operator's cab 6 is arranged on the side of the work attachment 4 and on the front side of the engine room 5.

The operator's cab 6 can be moved up and down along an inclined surface 7a of an elevating guide member 7 provided between the operator's cab 6 and the engine room 5. The inclined surface 7a is provided with a pair of guide rails (not shown), and the driver's cab 6 is formed with engagement grooves parallel to each other so as to engage with the guide rails.

The raising and lowering of the operator's cab 6 is performed by the expansion and contraction of the rod by the main cylinder 8 and the pair of left and right auxiliary cylinders 9. The head side of the main cylinder 8 is connected to the floor plate of the upper swing body 3, and the rod side is connected to the rear wall of the cab 6. On the other hand, the head side of the sub cylinder 9 is connected to the floor plate, and the rod side thereof is connected to the bottom surface of the cab 6.

In the figure, the driver's cab 6 shown by the solid line shows the elevated position where the main and auxiliary cylinders 8 and 9 are extended, and the driver's cab 6'shown by the phantom line has the main and auxiliary cylinders 8 and 9 contracted. The entry / exit position (storage position) is shown.

2A and 2B are enlarged views of the cab 6 and its peripheral portion. FIG. 2A is a side view of a main portion, and FIG.

In both figures, a driver's seat 6a is provided in the driver's cab 6.
A control box 6c having an operation lever 6b for operating the work attachment 4 is arranged on both left and right sides of the driver's seat 6a, and a boarding / alighting blocking lever 6 is provided on the front side of the control box 6c located on the boarding / alighting side.
d is provided.

The boarding / alighting blocking lever 6d is pulled upward when the operator leaves the cab 6 (6 in the figure).
(The position shown in d '), and when pulled up, all the operations except the driving of the engine are stopped and the locked state is set. Further, at this time, the a contact of the limit switch LS1 as the operation stop detecting means for detecting the operation stop of the working machine is opened and the b contact is closed (FIG. 3).
reference). Further, when the operator sits on the driver's seat 6a and pulls down the boarding / alighting blocking lever 6d, it functions to block the boarding / alighting of the operator, and the locked state is released to enable the operation. At this time, the b contact of the limit switch LS1 is opened and the a contact of the limit switch LS1 is closed, so that the entry / exit shutoff solenoid S / V described later is energized.

On the other hand, at the bottom of the cab 6, another limit switch LS2 as a cab position detecting means for detecting that the cab 6 has risen from the boarding / alighting position is provided. If the height of the limit switch LS2 is increased by, for example, 10 cm or more, the operator 12 comes into contact with a rail 13 formed in the vertical direction along the elevating guide member 7 to contact the actuator 12.
The contact c of is closed. In the figure, 14 is a bracket for fixing the limit switch LS2 to the bottom,
Reference numeral 15 is a connector.

In FIG. 3, reference numeral 11 denotes an alarm circuit 11 as alarm notification means connected to the limit switches LS1 and LS2.

In the figure, the entry / exit shutoff lever 6d is pulled up, and the contact b of the limit switch LS1 is closed. On the other hand, the limit switch LS2 connected in series with the limit switch LS1 has its c-contact open because the driver's cab 6 is in the entry / exit position. PL is a pilot lamp for falling warning and BZ is a buzzer, which is connected in parallel to the output side of the limit switch LS2. In addition,
The pilot lamp PL is for visual notification, and the buzzer BZ is for audio notification.

S / V is a boarding / disconnecting solenoid connected to the boarding / disconnecting lever 6d. When the contact a is closed and excited, the work machine can be operated. Become.

In the alarm circuit 11, since the c contact of the limit switch LS2 is open when the operator's cab 6 is not raised, the pilot lamp PL is operated even if the boarding / alighting blocking lever 6d is operated to the boarding / alighting blocking position or the blocking release position. , Buzzer BZ does not work.

However, when the operator's cab 6 rises from the entry / exit position, the c contact of the limit switch LS2 closes. Therefore, when the entry / exit shutoff lever 6d is pulled up in this state, the b contact of the limit switch LS1 also closes, and the alarm circuit 11 is energized. Then, the pilot lamp PL lights up and the buzzer BZ sounds.

As a result, if the operator mistakenly pulls up the boarding / alighting shut-off lever 6d while the operator's cab 6 is raised and tries to descend, the pilot lamp PL and the buzzer BZ give an alarm. Moreover, since the door is closed in this state, there is no fear that the operator will step out of the cab 6.

FIG. 4 shows a modification of the alarm circuit 11. In the following description, the same components as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted.

In the alarm circuit 11 shown in FIG. 4, a timer T is provided on the input side of the buzzer BZ. In this configuration, when the b contact of the limit switch LS1 and the c contact of the limit switch LS2 are both closed and the alarm circuit 11 operates, the contact T1 of the timer opens (off operation) after a predetermined time (for example, 5 seconds) elapses, and the buzzer BZ operates. The sound stops.

This configuration is useful in the following work modes. That is, the operator may interrupt the work and take a break in a state where the operator's cab 6 is raised. In that case, the operator operates the door by pulling up the boarding / disconnecting lever 6d so as not to accidentally touch the operation lever or the like to cause the working machine to malfunction. May lock in a stopped state.

Even in such a case, since the a contact of the limit switch LS1 and the c contact of the limit switch LS2 are both closed, the alarm circuit 11 operates and the buzzer BZ is activated.
Will sound. Therefore, if the sounding period of the buzzer BZ is limited by the timer T, the boarding / alighting blocking lever 6d is intentionally loaded.
In the case of taking a break while pulling up the buzzer, the buzzer BZ can be stopped to prevent noise.

Since the pilot lamp PL is still lit even when the buzzer BZ stops blowing, the operator can recognize that the cab 6 is at a high place.

In FIG. 5, instead of the timer T, a manually operable stop switch SW is provided. According to this configuration, the buzzer BZ can be stopped at the operator's will without waiting for the timer T to time.

This configuration is useful in the following work modes. That is, in the work of loading scrap onto the bed of the dump truck, the operator may verbally instruct the driver of the dump truck, for example, from the cab, and at this time, the door is opened. However, if the boarding / alighting blocking lever 6d is pulled up, the buzzer BZ sounds as described above, and thus it is not possible to give an instruction until the time counting period of the timer ends. Therefore, if the operator pushes the stop switch SW to stop the buzzing of the buzzer BZ, it becomes possible to promptly and verbally instruct outside the cab.

In the above embodiment, the alarm circuit 11 is described as a hardware using a sequence circuit, but the present invention is not limited to this and may be configured as a software using a microcomputer.

Further, in the present invention, both the cab position detecting means and the operation stop detecting means are constituted by limit switches, but the invention is not limited to this, and may be constituted by position detecting sensors such as proximity switches.

Further, although the alarm notification means of the present invention is constituted by the visual notification by the pilot lamp PL and the audio notification by the buzzer BZ in the above embodiment, the visual notification means is not limited to the pilot lamp PL but is, for example, a control box. A warning mark may be displayed on the liquid crystal display screen 6c. Further, instead of the voice notification, it is possible to perform a vibration notification in which the driver's seat 6a is vibrated by a vibrator, for example.

Further, in the present invention, the operation stop of the working machine is detected by the pulling-up operation of the boarding / alighting shutoff lever 6d, but the invention is not limited to this. It can also be configured to sometimes detect a deactivation. Also, the driver's seat 6a
A pressure switch is installed on the seating surface of the
It is also possible to detect the stoppage of the operation when it is separated from the seating surface of a.

[0048]

As is apparent from the above description,
According to the present invention of claim 1, for example, when the operator raises the operator's cab when performing scrap stacking work,
First, the cab position detecting means detects that the cab has risen, and when the operation of the work machine is stopped while the cab is located at a high place, the operation stop detecting means detects the operation stop, Since the alarm notification means is configured to give an alarm when both rising and operation stop are detected, if the operator stops the operation while the operator's cab is rising and accidentally tries to get out of the operator's cab, the door is opened. An alarm is issued before opening. Therefore, by issuing an alarm to the operator at an appropriate timing, it is possible to reliably prevent the operator from stepping off or dropping the foot from the cab.

According to the second aspect of the present invention, since the operation stop is detected by operating the getting on / off cutoff lever to the cutoff release position, there is no need to add a new structure to detect the operation stop. Existing configurations can be used.

According to the third aspect of the present invention, the alarm notifying means performs one or more of voice notification, visual notification, and vibration notification. The alarm can be reliably recognized.

According to the present invention of claim 4, since the alarm notification is stopped after a lapse of a certain period of time, for example, when the operator takes a break in the driver's cab, the operator accidentally touches the operation lever or the like to malfunction the working machine. The alarm notification can be stopped for a fixed period even if the operation is stopped by pulling up the boarding / alighting blocking lever for the purpose of not causing it.

If, for example, only the voice notification is controlled by the timer and the visual notification is continued, the alarm will not be an obstacle when taking a break, and the driver's cab will continue to be raised. The operator can be notified.

According to the fifth aspect of the present invention, when the operator outside the driver's cab is contacted, the alarm is issued once when the boarding / alighting shutoff lever is pulled up, but the operator is willing to issue the alarm. Since it can be stopped, the contact can be made quickly without being disturbed by the alarm.

[Brief description of drawings]

FIG. 1 is a side view of a working machine with a lifting cab according to the present invention.

FIG. 2A is an enlarged view of a driver's cab portion, and FIG. 2B is a plan view of relevant parts showing an arrangement of a limit switch LS2.

FIG. 3 is a diagram of an alarm circuit provided in an elevator cab according to the present invention.

FIG. 4 is a modification of the alarm circuit diagram shown in FIG.

FIG. 5 is another modification of the alarm circuit diagram shown in FIG.

[Explanation of symbols]

1 working machine 2 Undercarriage 3 Upper revolving structure 4 Work attachment (working device) 5 engine room 6 Elevating cab 6a Driver's seat 6d Access control lever LS1 limit switch (operation stop detection means) LS2 limit switch (driver position detection means) 11 Alarm circuit (alarm notification means) PL pilot lamp BZ buzzer T timer SW stop switch

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Claims (5)

(57) [Claims] 1. A working machine with a lifting cab, configured to raise a driver's cab from a boarding / alighting position to a working position according to a height of a work target and to operate the working device with a good field of view. A cab position detecting means for detecting that the cabin has risen from the boarding / alighting position, an operation stop detecting means for detecting an operation stop of the working machine, and both of the detecting means for raising the cab and stopping the work machine. An elevating cab-equipped work machine, comprising: an alarm informing means for informing an alarm when detected. 2. The working machine with a lift cab according to claim 1, wherein the operation stop can be detected by operating a boarding / alighting blocking lever provided on a boarding / alighting side of a driver's seat to a blocking release position. 3. The elevator cab according to claim 1 or 2, wherein the alarm notification means is configured to perform one or more of a sound notification, a visual notification, and a vibration notification. Working machine. 4. The working machine with a lifting cab according to claim 1, wherein the alarm notifying unit has a timer and is configured to notify an alarm for a predetermined period. 5. The working machine with a lifting cab according to claim 1, wherein the alarm notifying unit includes a stop switch for stopping alarm notification.