JPS6283995A - Detector for angle of rocking - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (t. Application field of overhanging) The present invention is directed to a swinging 8! which is driven by a hydraulic cylinder such as a crane. The present invention relates to a swing angle detection means for a swing member in a structure.

(Prior Art) As shown in FIG. 5, there is a crane poom hoisting device in which a poom 1 is rotatably supported by a fixed member 3 and is rotated by the expansion and contraction of a hydraulic cylinder 2. . Such a swinging mechanism is provided with an angle meter 20 as shown in Fig. M6, for example, in order to detect the swinging angle of the pool 1. This angle meter 20 has an arm 22 with a weight 21 formed at its tip, which is suspended freely from the side of the pool 1, while
A potentiometer 23 is attached to the side surface of the poom 1 in the direction of rotation of the arm 22, and a contact point 24 provided on the arm 22 is connected to the potentiometer 2 as the poom 22 rotates.
Move while touching 3.

When the poom 1 rotates, the potentiometer 23 attached to the side also displaces, but the 7-mu 22 always points to the vertical lower blade due to the gravity acting on the spindle 2, so the angle θ in Fig. 6 is the same as that in Fig. 5. Therefore, this angle θ is detected and displayed by an electric circuit as shown in FIG. 7. In this circuit, potentiometer 23 is I
A25 is connected to the ground, and a contact 24 of the 7-mem 22 moving on the potentiometer 23 is connected to the ground side via a voltage detector 26. Therefore, voltage detector 2
The voltage detected by 6 is determined by the contact 24 of the potentiometer 23.
When the boom 1 is located near the end 27 on the power supply 25 side of the potentiometer 23, that is, the higher the boom 1 is as it lies down in FIG. As it approaches, the pressure becomes lower. The swing angle corresponding to the voltage is displayed on the scale of the display section (meter section) of the voltage detector 26, and the crane operator performs the raising/lowering operation of the boom 1 while checking the swing angle indicated by the pointer on the display section.

(Problems to be Solved by the Invention) This angle meter has a structure in which the arm 22 is rotated by a weight 21 to maintain a vertical direction with respect to the swinging boom 1. Therefore, if the boom 1 is suddenly moved or stopped, the arm 22 will shake and cause a pendulum movement, and the detected value will also fluctuate accordingly, so the displayed angle will not be fixed until the shaking stops. The operator cannot know the correct swing angle, therefore
During this time, the operator has to continue the operation relying on visual inspection or temporarily stop the operation and wait for the shaking of the arm 22 to subside, making it difficult to raise and lower the boom 1.

In addition, in the case of this angle meter 20, since the arm 22 must rotate along a vertical plane, there is a problem that it cannot be used to detect the swing angle when the swing member rotates in a direction other than the vertical direction. there were.

SUMMARY OF THE INVENTION In view of the above problems of angle meters used to detect swing angles, the present invention aims to provide a detection device that can detect swing angles without using an arm that rotates due to gravity. .

(Means for Solving the Problems) The present invention provides a swing angle detection device that detects the swing angle of a swing member that rotates by expansion and contraction of a hydraulic cylinder about a fulcrum provided on a fixed member. The apparatus includes means for detecting the stroke position of the hydraulic cylinder and means for converting the detected stroke position into a swing angle of the swing member.

(Operation) Since the swing angle of the swing member corresponds to the stroke position of the hydraulic cylinder, the swing angle is detected by converting the stroke position detected by the detection means into a corresponding angle by the conversion means.

(Example) Embodiments of the present invention are shown in FIGS. 1 to 4.

In the crane pool hoisting device shown in Fig. 1,
1 is a boom that is a swinging member, and 2 is a hydraulic cylinder that rotates the boom. The boom 1 has one end rotatably attached to a fulcrum A provided on a fixed member 3, and the base end of the hydraulic cylinder 2 is also freely rotatably attached to another fulcrum B provided on the fixed member 3. The boom 1 is supported by rotatably connecting the tip of the piston rod 5 of the hydraulic cylinder 2 to a fulcrum C formed in the middle of the span of the boom 1.

The hydraulic cylinder 2 is provided with a stroke position detection means 6. The stroke position detection means 6 includes a magnetic scale 7 installed vertically inside the piston rod 5 as shown in FIG. 4, and a sliding movement of the piston rod 5 of the cylinder body 8 as shown in FIGS. It consists of a magnetic sensor 9 attached facing the surface. When the piston rod 5 slides, the internal magnetic scale 7 also moves, but at this time, the magnetic sensor 9 senses the change in magnetism generated by the magnetic scale 7, detects the stroke position, and outputs it as a stroke signal. do.

A conversion means 10 is connected to the output side of the magnetic sensor 9 as shown in the PtIJ1 diagram. The conversion means 10 consists of a calculator 11 and a display unit 12, and the calculator 11 calculates the swing angle θ of the boom 1 by performing the following calculations on the stroke position output from the magnetic sensor 9 as the stroke wheel No. 6. , is displayed on the display unit 12. That is, in FIG. 1, AB=1
．． , AC=12. If BC=1, 11”=IH2jlt2-2 el・l-2・cosC
1α=cos-N(i!+2+1z2/2)/(2L
4zHθ=180−(α+β10γ) [1 degree.

Therefore, if the distance #11 between the fulcrums BC is given from the stroke signal, θ can be found.

Next, the action will be explained.

When the operator operates the hydraulic cylinder 2 to raise and lower the boom 1, the magnetic scale 7 also moves as the piston rod 5 of the hydraulic cylinder 2 slides, and the magnetic sensor 9 captures the magnetic change caused by this and detects the change in the magnetic field. A stroke signal is output to 10. The calculator 10 calculates the swing angle θ of the boom 1 from this stroke signal, and the value displayed on the display 11 as 0 is determined from the stroke position of the hydraulic cylinder 2. Even when moving or stopping suddenly, there is no variation in the display angle, and accurate values are always displayed with a constant accuracy of one inch.

(Effects of the Invention) As described above, the swing angle detection device of the present invention detects the stroke position of the hydraulic cylinder that rotates the swing member, converts this into a swing angle, and detects the swing angle. Therefore, an accurate swing angle can be reliably detected even when the swing member suddenly rotates or stops suddenly. Therefore, in a crane using this type of swinging SaW, the operator can accurately raise and lower the boom while constantly grasping the swinging angle of the boom, which improves work efficiency and safety.

Further, unlike conventional angle meters, the present invention does not require an arm that rotates due to gravity, so it can be applied regardless of the rotation direction of the swinging member, and is highly versatile.

Furthermore, the present invention can also be used as a swing angle detection device when controlling a swing member, such as to prevent it from falling over, based on the swing angle.

[Brief explanation of drawings]

Figure 1 shows the boom hoisting of a crane showing an embodiment of the present invention*
A composite diagram of i*n side view and a configuration diagram of the swing angle detection device, Fig. 2 is a side view of the hydraulic cylinder that also shows the configuration of the stroke position detection means, and Fig. 3 is the same! ! Part sectional view Pt54 is a sectional view of the main part of the piston rod showing the arrangement of the magnetic scale. In addition, Fig. 5 is a side view of the main parts of a crane boom hoisting device showing a conventional example of a swing angle detection device, Fig. 6 is an enlarged side view of the same, and Fig. 7 is a circuit diagram showing the electric circuit. be. DESCRIPTION OF SYMBOLS 1...Boom, 2...Hydraulic cylinder, 3...Fixing member, 6...Store position detection means, 10...Conversion means.

Claims (1)

[Claims] In a swing angle detection device that detects a swing angle of a swing member that rotates due to expansion and contraction of a hydraulic cylinder about a fulcrum provided on a fixed member, a means for detecting a stroke position of a hydraulic cylinder and a detected stroke position are provided. 1. A swing angle detection device comprising: means for converting the angle into a swing angle of a swing member.