FI81202C - VINKELMAETARE SOM GRUNDAR SIG PAO TYNGDKRAFT. - Google Patents

Description

81202

GRAVITY ANGLE MEASURING INSTRUMENT SOM GRUNDAR SIG PA TYNGDKRAFT

The invention relates to an angle measuring method and means for measuring angles or directions in the vectical plane, so that the device indicates a direction or angle to be measured by a known quantity with respect to a reference or starting position, or a predetermined direction or angle can be set in the measuring means. has been reached with a measuring device.

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Previously known solutions have been presented e.g. U.S. Patent No. 4,320,581, in which a protracted horizontal spirit level (15.8) is placed in the angle measuring means, with which a disk 15 with a scale rotates. These are rotated by means of a small separate handwheel. In addition, the measuring device comprises an annular disc with an angular scale, which can be rotated and locked to accurately indicate the basic position, i.e. the horizontalness of the measuring side of the measuring device in an angular position of 0 °. The angular values indicated on the measuring side of the measuring range are obtained by rotating the spirit level-containing disc with the handwheel to a position where the spirit level balancing member indicates horizontality and the angular value can then be read from the scale disc.

U.S. Patent No. 4,6060,133 discloses an electronic angle measuring device having a gravity-based balancing member with a float and a counterweight in a liquid-filled chamber. Due to gravity, the float disc always retrieves to the equilibrium position and the digital codes on the outer edge of the Kellu-30 disc can be used to transmit the angle value to the display station.

The disadvantage of the current solutions presented above is their often insufficient accuracy. In a hand-held measuring device containing a spirit level, the person performing the measurement has to check both the position of the bubble bubble and the reading accuracy of the scale and both give a common error in the result. In addition, the use of a measuring device with the above-mentioned spirit level 2 81202 is difficult, because the meter must be able to see both the spirit level and the measuring scale and be able to turn the adjusting wheel.

The device and method according to the invention provide a decisive improvement in the disadvantages shown. To achieve this, the device and method according to the invention are characterized by what is set forth in the characterizing parts of claims 1 and 4.

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The main advantages of the invention can be considered the high reading accuracy, which can be selected as desired by a suitable motor / gear selection. The measuring device also achieves trouble-free linearity over the entire 360 ° measuring range. The device is simple and secure and the angle value can be easily transferred to a computer in digital form, e.g. for monitoring or alarm. In the method according to the invention, there is no effect of rest friction, because the measuring sensor is rotated at a constant speed and when the leveling element of the spirit level bypasses the equilibrium position, the bypass situation is electronically noted and the angular value is reported. Likewise, the counter of the measuring device is reset with each revolution of the measuring sensor when the reset cam passes the reset point.

In the following, the invention will be explained in detail with reference to the accompanying drawings.

Figure 1 schematically shows the angle sensor of a measuring device. Figure 2 shows a control and operation diagram of the measuring device.

Figure 1 shows an angle measuring device fastened to the profile frame (1) with screws (2), in which the stepper motor (3) rotates a shaft (23) at the end of which an angle measuring sensor is located by means of a gearbox (4). The angle measuring sensor comprises a liquid-filled vial (10) with a gas bubble and the movement of which is monitored by means of pairs of capacitors formed by the capacitor plates (11) and (9a, 9b). The magnitudes of the capacitances of the capacitor pair (11.9a) and (11.9b) are compared with each other and if the capacitances are the same

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3 81202 the gas bubble of the vial (10) is then in the horizontal position or passing this position. The spirit level (10) is attached by means of a strip (12) to a circuit board (7) in which the electronic bubble position determination components 5 (8) and (13) are located. The circuit board (7) is attached to the shaft (23) and the required voltage is applied to the circuit board along the slide (6,18), as well as along the shaft (23). The voltage on the slide (18) is applied from the switch box (5) along the spring strip (6). By means of the spacer (19), the circuit board (14) is attached to the gearbox (4). The circuit board has an LED (15) and a phototransistor (17). A reset cam (16) is attached to the circuit board (7), the rotation of which between the LED (15) and the phototransistor (17) is adjusted to take place simultaneously when the bubble of the vial (10) just passes the horizontal horizontal position when the sensor rotates the axis (23). around.

When the sensor has been reset, the bubble of the vial (10) bypasses the horizontal equilibrium position just when the leading edge of the reset cam (16) hits the phototransistor 2o r (17) and causes a pulse from the phototransistor to the control devices via cable (21) and connectors (22) , the pulse counter of the stepper motor (3) is also reset. When the horizontal plane of the spirit level (10) is adjusted to the same as the body of the measuring device, the basic side A 25 of the measuring body shows the horizontalness due to the value 0 of the pulse counter.

When the measuring device is turned to one of the measured angular positions, the gas bubble of the vial no longer passes its equilibrium position at the same time as the counter is reset, but the measuring sensor 30 must rotate by a certain angular value until the bubble of the vial (10) passes its equilibrium position. The angle required to rotate the probe is exactly the angle to be measured. The counter counts the number of pulses used to rotate the measuring sensor from the moment of reset to bypassing the equilibrium position of the bubble, and if the gearbox (4) is selected so that one revolution of the vial corresponds to 360 steps of the stepper motor. If the stepper motor uses 36,000 steps per revolution of the spirit level, a reading of 4,81,202 is obtained to two decimal places.

Fig. 2 shows a control diagram of an angle measuring device, where the oscillator (24) gives pulses to the controller (25) of the stepper motor (3) 5, the motor (3) continuously rotates the measuring sensor by means of a gearbox (4). The angle or direction formed by the body of the measuring device (1) is the same angle by which the measuring sensor must be rotated from the moment of resetting to the moment until the bubble in the vial (10) passes the equilibrium position. The counter 10 counts the pulses used for this. The device (27), which includes a power supply, a counter and electronic display control, indicates the magnitude of the angle on the display (28) by means of the number of pulses. The conductors (29) and (30) are voltage supply lines, and the part (26) includes devices for giving an impulse to reset the counter 15.

In addition, the measuring device can be used to measure by a method in which the desired angle value is set on the display (28) with the special controls. The measuring device can then be set to measure 20 set angles and when it is reached indicates the said angular position by sound or light signals. Furthermore, if the same angular value is repeatedly measured, the procedure can be as follows: When the angular value is first measured and displayed (28), this value is read on the display with a special locking switch, after which the same angular value can be measured repeatedly again and the measuring device indicates the realization of the angular position by means of light or sound signals.

The invention is not limited to the embodiment shown in the description and in the drawings, but can be modified within the scope of the appended claims. As the rotation motor of the measuring device, e.g. a constant speed rotating electric motor and the value of the angle to be measured can be derived from the time 35 the motor uses to rotate the measuring sensor from the moment of reset to the moment when the bubble of the vial passes the equilibrium position.

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Claims (8)

A method for measuring angle or direction by gravity, wherein a measuring instrument comprises a frame (1), a rolling measuring sensor attached thereto, in the corner lies one with the equilibrium means, such as a gas bubble, provided with a vial (10) and the horizontal position showing the equilibrium position of the drivetrain is adjusted to show the selected basic direction of the measuring instrument frame (1), characterized in that all other substantially angular positions of the measuring instrument frame (1) are measured by rolling with a motor (3). ) a measuring sensor fitted with the drum (10) with a constant rotational speed about the shaft (23), where during each revolution when the drum is briefly reaching the horizontal position showing the equilibrium position, the amount of rotation required for rolling the measuring probe is measured as given to the motor (3) from the said basic direction and is converted to a number or direction showing numerical value. A method for measuring angle or direction by gravity, wherein a measuring instrument comprises a frame (1), a rolling measuring sensor attached thereto, in which lies an equilibrium member, such as a gas bubble, equipped with a vial (10) and the horizontal position showing the equilibrium position of the drum is adjusted to show the selected basic direction of the measuring instrument frame (1) characterized in that with a control unit (27) given, the numerical value of the deviation of the selected direction or angle is stored in the measuring instrument and the measuring instrument converts the tili as the rotational amount of the motor (3) which rolls the measuring instrument at a constant rotational speed, which rotational amount corresponds to rotation of the measuring instrument from the basic direction of the frame to a given directional deviation or angle of its quantity and the measuring instrument shows with light or sound marks; when the frame is substantially in the vertical plane, the tile is said to have turned from the basic direction. 3. A method according to claims 1 and 2, characterized in that the horizontal position of the drum (10) showing the equilibrium position of the gas bubble gives capacitors (11 l 9 81202 and 9a) and (11 and 9b) substantially equal capacitance values. Apparatus for carrying out the method according to claims 1 and 2, characterized in that it comprises a pivotal shaft (10) in the rolling shaft (23), in connection of which is mounted means (11), (9a) and (9b) for controlling the horizontal position of the drivetrain showing the equilibrium means, and with said shaft rolling a platform member (7), in which is placed at least one device for conducting voltage to said means and to the mounted electrical components (8 , 13) and that the device comprises an electrical or mechanical acting sensor part (26) which can be adjusted so that the arrival of the part (16) lying in the platform part (7) on the sensor part (26) is handled simultaneously while in the labile part. the horizontal gas bubble passes the horizontal equilibrium position and the base side of the frame of the feeding instrument (1) is in the horizontal position, di in a control device (27) calculating counter to the value noli and that the device comprises a switch (4) an electric motor ( 3) for rotating the shaft (23) and control devices (25) to control the motor (3) and the conversion devices in the control device (27) to convert the rotational amount of the motor (3) to angular value and devices (28) to display angular value . Device according to claim 4, characterized in that the electric motor (3) is a stepper motor. 6. Device according to claims 4 or 5, characterized in that the drum (10) is located in an electric field formed by the capacitor plates (11,9a, 9b). 7. Apparatus according to claims 4-6, characterized in that the sensor part (26) is formed by a light-transmitting means (15), which is the LED diode and a light-receiving means (17), which is the phototransistor. 10 81 202 8. Device according to claims 4-7, characterized in that it comprises light and / or sound signal devices, which show the direction of the basic side of the measuring instrument frame (1) or the angle value between the basic side and the nA-one basic direction. be as the desired value.