JP2003057030A - Inclination detector for work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely set an angle of inclination having to output a detection signal while utilizing an existing inclination detection switch. SOLUTION: The inclination detection switch 10 for outputting a detection signal when a switch main body 11 is inclined by a predetermined angle is used. A weight member 20 is suspended from the inclination detection switch 10 to form a pendulum and this pendulum is held to the holding member 30 fixed to the specific region 40 of a work machine in a shakable manner. The pendulum is held to a vertical state until the angle of inclination of the holding member 30 reaches θ1 and, when the angle of inclination becomes θ2 or more, the pendulum comes into contact with the holding member 30 to integrally incline the pendulum and the holding member 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device installed in a work machine for detecting a tilted state of a specific portion of the work machine.

[0002]

2. Description of the Related Art Generally, a machine for working with a work member protruding upward, for example, an aerial work machine in which a bucket or various work machines are attached to the tip of a boom or a post, or a ground improvement excavator. In various construction machines such as the first one, the entire machine is used in a relatively unstable state in terms of balance. Therefore, it is preferable that such a working machine is used in a horizontal state as much as possible for safety, and when a specific part of the machine is tilted by a predetermined angle or more, it is quickly detected and an alarm is detected. It is desirable that a device be attached.

Conventionally, as a device for detecting such a tilted state of a work machine, a pendulum whose weight is suspended is swingably held by a detection device body fixed to a specific portion of the work machine, and the detection device is used. It is known that the detection device main body is configured to contact the pendulum when the main body is tilted to a predetermined angle together with a specific part of the work machine, and the contact is electrically detected to output an alarm to the outside. Has been.

In addition to such a switch type detection device, as a device for analogly detecting the actual inclination angle, the relative angle of the pendulum with respect to the detection device body (that is, the inclination angle of the detection device body with respect to the vertical direction). There is also known a device which converts the electric signal into an electric signal by a potentiometer and outputs the electric signal to the outside.

[0005]

The switch type inclination detecting device outputs an alarm signal when the detecting device body is inclined by a preset angle with respect to the pendulum (that is, with respect to the vertical direction). However, the tilt angle at which an alarm or the like is to be actually issued in the work machine differs depending on the type and specific configuration of the work machine. Therefore, the tilt detection device must be designed and manufactured for each work machine, and the versatility is low.

On the other hand, according to the device for detecting the tilt angle in an analog manner by using the potentiometer or the like, although the limit tilt angle at which the alarm or the like should be issued can be freely set, the switch type detection is possible. There is a drawback that the structure is complicated and expensive compared to the device.

In view of such circumstances, it is an object of the present invention to make it possible to freely set an inclination angle at which a detection signal should be output while using an existing inclination detection switch.

[0008]

As a means for solving the above-mentioned problems, the present invention uses a tilt detection switch which outputs a tilt detection signal when the switch body is tilted by a predetermined angle or more with respect to the vertical direction. An inclination detection device, which is fixed to a specific part of a work machine, holds a pendulum including the inclination detection switch so that the pendulum can swing, and when the relative inclination angle with respect to the pendulum becomes a predetermined angle or more, A holding member that abuts and blocks further relative inclination is provided, and the pendulum including the inclination detection switch is kept in a vertical posture regardless of the inclination of the holding member until the pendulum comes into contact with the holding member. The holding member and the switch main body of the tilt detection switch are configured to be tilted integrally with each other while the pendulum is in contact with the holding member.

According to this structure, the pendulum including the tilt detection switch is maintained in the vertical posture regardless of the inclination of the holding member until the pendulum including the tilt detection switch comes into contact with the holding member. Since the holding member and the switch main body of the tilt detection switch are integrally tilted in the state where the pendulum is in contact, the holding member and the pendulum are held at the set angle of the tilt detection switch from the tilt angle at which the contact with the pendulum starts. Only when the member is tilted, a detection signal is output from the tilt detection switch. Therefore, even if the set angle of the tilt detection switch (the tilt angle of the switch body when the detection signal is output from the tilt detection switch) is determined, the pendulum including the tilt detection switch and the holding member come into contact with each other. By appropriately setting the angle, it is possible to freely set the tilt angle at which the detection signal is actually output from the tilt detection switch.

As a concrete structure of the pendulum, a weight member is preferably hung from the inclination detection switch, and in this pendulum, the upper end of the weight member or a portion in the vicinity thereof is held by a holding member. This makes it possible to stabilize the state of the pendulum and prevent the tilt detection switch from frequently swinging due to vibration or the like during traveling.

In this case, the holding member has an enclosing portion that encloses the weight member from the outside in the radial direction, and the relative inclination of the pendulum including the weight member is prevented by the contact between the enclosing portion and the weight member. With this configuration, the pendulum and the holding member can be reliably brought into contact with each other with a simple structure.

Further, the surrounding portion forms a closed chamber in which the weight member is closed, and a resistance fluid for suppressing the vibration of the weight member is enclosed in the closed chamber. The vibration of the pendulum including the tilt detection switch can be suppressed more effectively.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings.

The tilt detection device shown in FIG. 1 holds a tilt detection switch 10, a weight member 20 hanging from the tilt detection switch 10, and a pendulum composed of the tilt detection switch 10 and the weight member 20 so as to be swingable. Holding member 30
It has and.

The tilt detection switch 10 is provided with a hollow switch body 11, which has a predetermined angle θ.
Detection signal (for example, alarm command signal) when tilted more than 1
Is configured to output.

As shown in FIGS. 2A and 2B, the switch body 11 accommodates a contact switch element 12, an operation plate 13, and a weight 14 hanging from the operation plate 13. At the same time, a fluid (for example, oil) for suppressing these vibrations is enclosed. A flange portion 11a is formed at the lower end of the switch body 11.

The contact switch element 12 is fixed to the switch body 11 so as to be tilted integrally with the switch body 11, and has a ring-shaped contact 12a on the lower surface thereof. The operation plate 1
3 is configured to be electrically detected to output a detection signal to the outside.

The operation plate 13 is swingable both around the horizontal X axis and around a horizontal Y axis orthogonal to the X axis by a gyro mechanism including a ring 15. It is supported by 11.

More specifically, the ring 15 is interposed between the operation plate 13 and the switch body 11, and the ring 15
The operation plate 13 has a pair of swing center shafts 16 extending in the Y-axis direction.
Is supported so as to be swingable around the swing center axis 16 via the ring, and the ring 15 is swingable around a pair of swing center axes 17 extending in the X-axis direction on the switch body 11. Is supported as.

Further, due to the weight of the weight 14 hanging from the operation plate 13, the operation plate 13 is moved to the switch main body 1
It is kept horizontal regardless of the inclination of 1. Therefore, the contact 12a of the contact switch element 12 fixed to the switch body 11 side is brought into contact with the operation plate 13 by inclining the switch body 11 by a predetermined angle θ1 or more with the operation plate 13 kept in the horizontal state. It is configured to contact and output a detection signal.

The tilt detection switch 1 used in the present invention.
0 is not limited to the one shown in the figure, and in short, it may be any one that outputs a detection signal when the switch body is tilted by a predetermined angle or more. For example, a contact member may be arranged around the weight 14 and a detection signal may be output when the contact member and the weight 14 contact each other.

As shown in FIGS. 1 and 3A and 3B,
The weight member 20 includes a shaft 21 extending in the vertical direction and a shaft 21.
And a weight 22 fixed to the lower end of the.

A flange portion 21a is formed on the upper end of the shaft 21, and the flange portion 21a is formed on the switch body 1.
The tilt detection switch 10 and the weight member 20 are united by being abutted with the flange portion 11a formed at the lower end of the No. 1 and fastened with the bolt 42, thereby constructing a pendulum extending in the vertical direction.

A sleeve 23 as a spacer is loosely fitted around the shaft 21, a window is formed in the upper portion of the sleeve 23, and a spherical body 24 projects radially outward through the window. The spherical body 24 has a vertical through hole in the center thereof, and is fixed to the shaft 21 with the shaft 21 inserted through the through hole.
3 and 3 form a pillow bearing.

The weight 22 has a thick donut plate shape in the illustrated example, and the lower end portion of the shaft 21 is inserted into a through hole provided in the center thereof, and a male screw provided at the lower end of the shaft 21. By tightening the nut 25 on the portion 21b, the weight 22 is fixed to the lower end of the shaft 21 with the sleeve 23 interposed between the weight 22 and the flange portion 21a.

The holding member 30 is provided with a substrate 31, and a bearing holding block 32 is provided on the upper surface of the central portion of the substrate 31 with a bolt 3 attached thereto.
The spherical seat 33 is held at the center of the base plate 31 and the bearing holding member 32. The spherical seat 33 holds the entire pendulum including the spherical body 24 so as to be swingable both around the X axis and around the Y axis while being fitted onto the spherical body 24.

Incidentally, reference numeral 44 in FIG. 1 denotes a protective cover 44 fixed on the substrate 31 so as to cover the tilt detection switch 10.

A box body 35 is fixed to the lower surface of the substrate 31,
A sealed chamber 34 for sealing the weight member 20 is formed inside the box body 35, and a resistance fluid (for example, oil) for suppressing vibration of the weight member 22 is sealed in the sealed chamber 34. There is.

The box body 35 has a bottom wall 37 fixed to a specific portion of the work machine (a portion to be detected for inclination), a top wall 38 fixed to the substrate 30 in a superposed state, and these bottom walls. 37 and a side wall 36 having a cylindrical shape that connects the ceiling wall 38 in the vertical direction. The side wall 36 surrounds the weight member 22 over the entire circumference, and as shown in FIG. 4, the holding member 30 is inclined relative to the pendulum by a predetermined angle θ2 or more, as shown in FIG. The weight 22 contacts the inner peripheral surface of the side wall 36 so that the pendulum cannot further swing with respect to the holding member 30.

A through hole 38a having a size sufficient to allow the shaft 21 to swing within the range of the predetermined angle θ2 is provided in the central portion of the ceiling wall 38.

Next, the operation of this inclination detecting device will be described.

First, as shown in FIG. 1, the weight member 20 is located in the center of the closed chamber 34 in a state where a specific portion of the work machine and the holding member 30 fixed thereto are kept horizontal. A sufficient distance is maintained between the outer peripheral surface of the weight 22 and the inner peripheral surface of the side wall 36.

When the specific portion 40 of the work machine is tilted from this state, the holding member 30 is tilted integrally with this, but the tilt detection switch 10 is held swingably with respect to the holding member 30, and Since a large gravity acts on the weight member 20 hung from the tilt detection switch 10, the entire pendulum including the tilt detection switch 10 is held in the original vertical posture regardless of the tilt of the holding member 30. Operation plate 1 provided inside the tilt detection switch 10
3 is kept horizontal.

However, the inclination angle of the specific portion 40 and the holding member 30 (the inclination angle from the vertical posture shown in FIG. 1)
Reaches θ2, as shown in FIG. 4, the weight 2 of the weight member 20 is
2 abuts on the inner peripheral surface of the side wall 36 of the holding member 30, and the pendulum composed of the weight member 20 and the tilt detection switch 10 swings with respect to the holding member 30 (that is, relative tilting). ) Will not be possible. In other words,
From the time when the inclination angle of the holding member 30 becomes θ2 or more, the holding member 30, the inclination detection switch 10 and the weight member 20 are integrally inclined. Then, when the inclination angle of the inclination detection switch 10 reaches θ1, that is, when the inclination angles of the holding member 30 and the specific portion 40 of the working machine reach (θ2 + θ1), the contact switch in the inclination detection switch 10 is reached. Contact 12 of element 12
The operation plate 13 comes into contact with a, and a detection signal (for example, an alarm command signal) is output from the tilt detection switch 10.

Therefore, according to this tilt detecting device, even if the set detection angle of the tilt detecting switch 10 is fixed to θ1, the tilt detecting switch 10 is not modified at all and is not changed. The set detection angle can be freely changed with an inexpensive structure in which only the weight member 20 and the holding member 30 are added.

The embodiment of the present invention is not limited to the above-mentioned one, and the following forms can be taken as an example.

(1) In the illustrated example, the side wall 36 which is the surrounding member.
Shows a cylindrical shape, but by setting the cross-sectional shape of the side wall 36 to an appropriate closed curve (including polygon) other than a circle, the set detection angle can be changed depending on the inclination direction.

(2) In the above-described embodiment, the inclination is detected in both the X-axis direction and the Y-axis direction which are orthogonal to each other, but in the present invention, the inclination detection direction is set to one direction (for example, one direction). (Only in the X-axis direction).

(3) The weight member 20 is not always necessary,
For example, the tilt detection switch 10 is fixed to the lower end of the long body, and the upper end of the long body is swingably held on the holding member 30 side (that is, the tilt detection switch 10 is hung).
You may do it. However, as shown in the drawing, the weight member 20 is hung below the inclination detection switch 10 to make the weight member 2
By holding the upper end of 0 or the vicinity thereof, the posture of the pendulum is stabilized, and it is possible to avoid the tilt detection switch 10 itself from frequently swinging due to vibration or the like during traveling. Further, by sealing the weight member 20 in the sealed chamber 34 and enclosing the vibration suppressing fluid therein, the vibration suppressing effect is further improved.

(4) In the above-described embodiment, in addition to the detection signal output from the inclination detection switch 10, the time when the weight 22 comes into contact with the side wall 36 (the inclination angle of the holding member 30 is θ).
It is also possible to configure so that the preliminary detection signal is output when the value reaches 1. For example, if control is performed such that an alarm is issued by this preliminary detection signal and then the operation of the work machine is forcibly stopped by the main detection signal output from the tilt detection switch 10, the safety and workability of the work machine can be improved. Can be increased.

[0041]

As described above, according to the present invention, the pendulum is constructed by using the tilt detection switch which outputs the detection signal when the switch body is tilted by the predetermined angle, and the pendulum is swingably held by the holding member. Then, when the holding member is tilted at a predetermined angle together with a specific portion of the work machine, the pendulum is brought into contact with the holding member to prevent its swinging. With an inexpensive structure that uses the switch as it is, there is an effect that the inclination angle at which the detection signal should be output can be freely set.

[Brief description of drawings]

FIG. 1 is a sectional front view showing a state in which an inclination detection device is horizontal in an embodiment of the present invention.

2A is a sectional front view showing the internal structure of a tilt detection switch used in the tilt detection device, and FIG. 2B is a sectional plan view showing the same structure.

3A is a sectional view taken along line AA of FIG. 1, and FIG. 3B is FIG.
FIG. 6 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional front view showing a state in which the holding member of the tilt detection device is tilted by a predetermined angle θ2 together with the work machine in the embodiment of the present invention.

[Explanation of symbols]

10 Tilt detection switch 11 Switch body 20 Weight member 22 weights 30 holding member 33 Spherical seat 34 closed room 36 Side wall (enclosing member) 40 Specific parts of work machine

Claims (4)

[Claims] 1. A tilt detection device using a tilt detection switch for outputting a tilt detection signal when the switch body is tilted by a predetermined angle or more with respect to the vertical direction, the tilt detection device being fixed to a specific portion of a work machine, A pendulum that includes a detection switch is swingably held, and a holding member that abuts the pendulum and prevents further relative tilt when the relative tilt angle with respect to the pendulum becomes a predetermined angle or more, Until the pendulum contacts the holding member, the pendulum including the tilt detection switch is kept in the vertical posture regardless of the tilt of the holding member, and the holding member and the tilt detection are in contact with the holding member. A tilt detecting device for a working machine, wherein the switch main body and the switch main body are configured to tilt together. 2. The tilt detecting device for a working machine according to claim 1, wherein the pendulum is configured by suspending a weight member from the tilt detection switch, and in the pendulum, an upper end of the weight member or a vicinity thereof. An inclination detecting device for a working machine, wherein a portion is held by a holding member. 3. The tilt detecting device for a working machine according to claim 2, wherein the holding member has an enclosing portion that encloses the weight member from the outside in the radial direction, and the holding member has a contact with the weight member. An inclination detection device for a working machine, which prevents relative inclination of a pendulum including a weight member. 4. The tilt detecting device for a working machine according to claim 3, wherein the surrounding portion forms a closed chamber in which the weight member is closed, and the vibration of the weight member is suppressed in the closed chamber. A tilt detecting device for a working machine, characterized in that a resistance fluid for filling is enclosed therein.