JP5759730B2 - Safety device for road roller - Google Patents

Description

  The present invention relates to a safety device mounted on a road roller.

  For load rollers such as self-propelled rollers, rolling rollers, vibration rollers, and trench rollers, various techniques have been proposed in order to prevent accidents in contact with workers and obstacles that occur in the blind spots of the driver.

  For example, in Patent Document 1, a guard frame is provided in front of or behind a road roller, and a limit switch linked to an alarm buzzer is provided on the guard frame, thereby preventing contact with a blind spot from a driver's seat. Is described.

Registered Utility Model Publication No. 3004721

However, the contact prevention device described in Patent Document 1 may have the following problems.
(1) Even if the contact of the guard frame is detected, only the driver is notified. Therefore, when the driver's recognition is delayed, a contact accident may not be avoided. In actual work, there are various places where the driver is paying attention to the work in progress, such as paying attention to the side of the road roller to arrange the traveling line, paying attention to the back when going backwards, etc. For this reason, it is impossible to completely eliminate the risk of contact accidents by relying on driver recognition.
(2) For inexperienced drivers, alerting by an alarm buzzer does not always cause the driver to avoid contact accidents, such as causing a panic situation and inducing a driving error even if the driver receives an alert. It is not always possible to guide.
(3) In actual work, if the guard frame moves each time due to unevenness of the roadbed or vibration during work, the limit switch is touched without darkness, and unnecessary reports may frequently occur.

  Accordingly, an object of the present invention is to provide a safety device for a road roller that can reliably avoid a road roller contact accident by a method different from the conventional technique described above.

The first invention of the present application to solve the above conventional problems is a safety device attached to a road roller, which is attached to at least one of the front surface and the rear surface of the road roller, and has a predetermined pressing force or more. A movable fence configured to swing toward the load roller side, a first sensor that is attached so as to protrude from the outer surface of the movable fence and detects its own deformation, and toward the load roller side of the movable fence A second sensor for detecting the swing of the load roller, a control device for stopping the driving of the load roller by a detection signal of at least one of the first sensor and the second sensor, and stopping the driving of the load roller. The gist of the present invention is to provide a safety device for a road roller, characterized in that it includes a release device for releasing.

In the invention, the first sensor may be a cushion sensor attached to only a part of the outer surface of the movable fence, and the second sensor may be a limit switch.
Moreover, in the said invention, you may comprise so that the said cancellation | release apparatus may be arrange | positioned outside the range of the space which can be touched from the driver who boarded the driver's seat.
In the present invention, the movable fence may be composed of an inner frame that is pivotally supported by the load roller body and an outer frame that is slidably attached to the frame of the inner frame so as to extend vertically. .
Also, in the invention, while continuing to receive at least one of the detection signal of the first sensor or the second sensor may further comprise an alarm device for permanently actuated.

According to the present invention, at least one of the following effects can be obtained.
(1) Since an approach of an obstacle or a worker is detected and the driving of the road roller is forcibly stopped, a contact accident can be surely prevented without being influenced by the driver's experience.
(2) Since the driver does not increase the matters to be judged and processed, the driver's attention burden is reduced and the driver can concentrate on the original work.
(3) Accidents due to operational mistakes (secondary disasters) when the approach of an obstacle or worker is detected, even if the driver panics and issues an inappropriate driving command, the road roller does not respond. Does not invite the expansion of
(4) By providing sensors with different detection methods, the approach detection rate can be increased regardless of the manner in which obstacles and workers approach, and this contributes to ensuring safety.
(5) The operating height of the movable fence can be freely adjusted according to the condition of the roadbed at the work place (size of unevenness, presence or absence of steps), and there is no darkness due to the unevenness of the roadbed or the vibration of the road roller itself. Therefore, the possibility of frequent unnecessary notifications can be eliminated. Further, even when an obstacle or a worker touches the outer frame, the detection by the outer frame can be reliably transmitted to the inner frame.
(6) By disposing a release device for releasing the driving stop of the road roller away from the driver's seat, the driver is surely removed from the driver's seat when an obstacle or approach of a worker is detected. Thus, safety can be further improved by prompting the driver to check around the driver or calming the driver himself.

Schematic which shows the structure of the safety device of this invention. Schematic which shows an example of the movable fence of this invention. Schematic which shows operation | movement of the safety device of this invention.

  Hereinafter, embodiments of a working machine and a travel control device according to the present invention will be described with reference to the drawings.

<1> Overall Configuration FIG. 1 is a schematic diagram showing the configuration of the safety device of the present invention.
The safety device of the present invention includes a movable fence 1, a first sensor 2 attached to the outer surface of the movable fence 1, a second sensor 3 for detecting the swing of the movable fence 1, and detection of the sensors. In response, the controller 4 includes at least a control device 4 that stops the driving of the load roller and a release device 5 that releases the driving stop of the load roller.
Details of each member will be described below.

<2> Movable fence FIG. 2 is a diagram illustrating an example of the movable fence 1.
The movable fence 1 is a member configured to be swingable in the front-rear direction with respect to the load roller A by contact with an obstacle or an operator. Moreover, it is preferable that it is a magnitude | size of the grade which covers the roller A1 part of the load roller A as the movable fence 1 whole. The movable fence 1 is provided with a swing shaft in the upper lateral direction and is configured to swing back and forth with respect to the load roller A.
More specifically, the movable fence 1 includes a substantially rectangular inner frame 11 that is pivotally supported by the load roller A body, and a substantially rectangular shape that is slidably attached to the frame of the inner frame 11 so as to extend vertically. A character-shaped outer frame 12.
According to this configuration, the operating height of the movable fence can be freely adjusted according to the condition of the roadbed at the work place (size of unevenness, presence or absence of steps).
Further, even when an obstacle or a worker touches the outer frame 12, the detection by the outer frame 12 can be reliably transmitted to the inner frame 11.

Further, the movable fence 1 is supported by a known member (not shown) such as a damper from the road roller A side so that it has a constant angle (θ) in the outer direction of the road roller with respect to the perpendicular to the roadbed. It is desirable that the apparatus be configured to swing toward the load roller A when a pressing force exceeding a predetermined value is received.
Further, the outer frame 12 is a mechanism that can slide up and down with respect to the inner frame 11, or a mechanism (not shown) that can adjust the lateral width of the inner frame 11 and the outer frame 12. You may comprise so that a height and a width | variety can respond to a change according to the size of a load roller.

<3> Sensor group Details of various sensor groups used in the safety device of the present invention will be described below.

<3.1> 1st sensor The 1st sensor 2 is a sensor attached to the outer surface of the movable fence 1, for example, can use a pressure-sensitive cushion sensor. The cushion sensor is a sensor that detects its own deformation, and is configured to transmit a detection signal to the control device when an obstacle or a worker comes into contact with the cushion sensor.
As shown in FIG. 2, the first sensor 2 may be attached to a part of the outer surface of the movable fence 1, or may be attached so as to cover the entire outer surface of the movable fence 1.

<3.2> Second sensor The second sensor 3 is a sensor that detects the swing of the movable fence 1 toward the load roller A, and for example, a limit switch can be used. When the swingable movable fence 1 comes into contact with the limit switch, a detection signal is transmitted to the control device.
The limit switch is not particularly limited as long as it can detect the swing of the movable fence 1 toward the load roller A, as described above.

<3.3> Combination of Sensors As in this embodiment, if a plurality of sensors with different detection means are provided, the approach detection rate is increased regardless of the manner in which an obstacle or worker approaches. Can contribute to ensuring safety.
In this embodiment, the first sensor 2 is a pressure-sensitive cushion sensor provided on a part of the outer surface of the movable fence 1, and the second sensor 3 is a swing of the movable fence that covers the front surface of the road roller A. However, according to this configuration, when the obstacle comes into contact with the worker or the first sensor, the detection by the first sensor 2 and the movable fence 1 are pushed against the obstacle. Since the detection by the second sensor 3 by swinging is performed stepwise, the detection redundancy is excellent and the safety is improved.
In addition, by configuring the second sensor 3 with an inexpensive limit switch so as to cover the front surface of the load roller A, the material cost of the first sensor 2 composed of a relatively expensive pressure-sensitive cushion sensor is excessive. By installing it in a suitable location with a size that does not become, it is possible to balance the cost-effectiveness.

<4> Control Device The control device 4 is means for forcibly stopping the driving of the load roller A by a detection signal transmitted from at least one of the first sensor 2 and the second sensor 3. is there.
As a specific method for stopping the driving of the road roller A, a new circuit is interposed in the middle of the control circuit of the driving source, the control program is rewritten, or the function of the safety circuit already provided in the road roller A is provided. A known method such as diversion can be appropriately employed.

<5> Release Device The release device 5 is a means for releasing the driving stop of the road roller A.
A specific method for canceling the driving stop of the load roller A is the same as that of the configuration example of the control device, and thus the description thereof is omitted.
The release device 5 is preferably provided outside the range of the space (action space B) that can be touched when the driver is in the driver's seat as shown in FIG. It can be placed forward. With this arrangement, when an obstacle or approach of a worker is detected, the driver is surely removed from the driver's seat to promote safety confirmation around the road roller A or to calm the driver himself / herself. By making it, safety can be further improved.

<6> Others In addition, an alarm device 6 such as a patrol light or an alarm buzzer for indicating the operation status of the present invention may be separately provided on the road roller A main body.
The alarm device 6 is configured to operate constantly while at least one of the first sensor 2 or the second sensor 3 continues to detect contact with an obstacle or a worker. Can do.

<7> Example of Operation FIG. 3 is a schematic diagram showing the operation of the safety device of the present invention.
(1) Normal time In the normal time, the movable fence 1 is arranged from the road roller A side to the damper 13 or the like so as to be arranged at a certain angle (θ) in the outward direction of the road roller A with respect to the perpendicular to the roadbed. Support with.
In addition, an appropriate distance (H) is provided between the lower end of the movable fence 1 and the roadbed, and a clearance is ensured so that the movable fence does not swing by interfering with uneven parts of the roadbed itself or steps such as curbs. Keep it.
As a method of adjusting the interval (H), there are a method of sliding the outer frame 12 up and down with respect to the inner frame 11 constituting the movable fence 1 and a method of adjusting the support angle (θ) of the movable fence 1. is there.

(2) Detection by the first sensor When an obstacle or a worker approaches the road roller A, the first sensor 2 is basically contacted. At this time, the control device 4 forcibly stops the driving of the load roller A regardless of whether or not the movable fence 1 is oscillated, and prevents an obstacle or a worker from touching or getting caught in the roller A1. .

(3) Detection by the second sensor Depending on the size of the first sensor 2, an obstacle or an operator may approach the road roller A without contacting the first sensor 2.
At this time, since the obstacle and the worker are in direct contact with the movable fence 1, the movable fence 1 swings toward the road roller A by a reaction force received from the obstacle and the worker. The swing is detected by the second sensor 3, and the control device forcibly stops the driving of the load roller A regardless of the presence or absence of detection by the first sensor 2.

(4) in order to restart the actuation of the release operation load roller A, it is necessary to release the driving stop of the load roller by the control device sends a release signal from the release device.
At this time, if the release device is disposed outside the space (action space B) that the driver can touch from the state where the driver is in the driver's seat, the driver's seat is obligatory, so the area around the road roller A Safety can be improved by encouraging the driver to confirm safety and calming the driver himself.

[Example of release operation]
Note that when receiving the release signal, at least one of the first sensor 2 and the second sensor 3 is still detecting the contact of the obstacle or the worker, Any one of the processes may be configured to be appropriately selected.

[Release operation example 1]
For example, if the detection signal from the first sensor 2 or the second sensor 3 is set to have priority over the release signal from the release device 5, the first sensor 2 and the second sensor 3 are in a normal state. Unless returning, it is possible to obtain a situation where the driving stop of the load roller A cannot be released.
The above setting is effective when it is desired to reliably prevent a secondary disaster caused by a driver's erroneous operation, or when a detection factor approaching the first sensor 2 or the second sensor 3 can be easily removed. is there.

[Release operation example 2]
Contrary to the release operation example 1, if the release signal by the release device 5 is set to have priority over the detection signal by the first sensor 2 or the second sensor 3, the first sensor 2 and the second sensor 2 Even if the sensor 3 is in the detection state, it is possible to obtain a situation in which the driving stop of the road roller A can be released.
In the above setting, when the detection factor approaching the first sensor 2 or the second sensor 3 is a building or a structure, it is difficult to return each sensor to the normal state unless the road roller itself is driven. This is effective.

  The control device 4 or the release device 5 according to the present invention may be configured so that the release operation example 1 or the release operation example 2 can be selected each time.

(5) Example of Alarm Device Operation The alarm device 6 can be configured to operate independently or in conjunction with the release operation of the driving stop of the road roller A by the release signal of the release device 5.
For example, in either case of the release operation example 1 or 2, as long as the first sensor 2 and the second sensor 3 do not return to normal time, the alarm device 6 is configured to continuously generate an alarm. be able to.
Further, in the case where the operation of the alarm device 6 and the operation of stopping and releasing the driving of the road roller A are interlocked, even if the first sensor and the second sensor are not restored during normal operation. The alarm by the alarm device can also be stopped when the load roller drive stop canceling operation is performed.
Each of the above-described configurations may be appropriately designed and changed according to the requirements at the site of use.

DESCRIPTION OF SYMBOLS 1 Movable fence 11 Inner frame 12 Outer frame 2 First sensor 3 Second sensor 4 Control device 5 Release device 6 Alarm device

Claims (5)

A safety device attached to the road roller,
A movable fence attached to at least one of the front and back surfaces of the load roller and configured to swing toward the load roller side with a predetermined pressing force;
A first sensor that is attached so as to protrude from the outer surface of the movable fence and detects its own deformation;
A second sensor for detecting the swing of the movable fence toward the load roller;
A control device that stops the driving of the load roller by a detection signal of at least one of the first sensor and the second sensor;
A release device for releasing the driving stop of the road roller;
A safety device for a road roller, comprising: The first sensor comprises a cushion sensor attached to only a part of the outer surface of the movable fence,
The safety device for a road roller according to claim 1, wherein the second sensor includes a limit switch. 3. The road roller safety device according to claim 1, wherein the release device is arranged outside a space that can be touched by a driver who has boarded the driver's seat. 2. The movable fence includes an inner frame pivotally supported by a load roller body and an outer frame that slides on the frame of the inner frame and is attached to be vertically extendable. 4. The safety device for a road roller according to any one of items 1 to 3 . Characterized between, further comprising a warning device for permanently actuation continues to receive at least one of the detection signal of the first sensor or the second sensor, according to claim 1 to 4 The safety device for road rollers according to any one of the above.

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