JPS636655Y2 - - Google Patents

Description

[Detailed Description of the Invention] In the present invention, a float and a weight are suspended from both ends of a rope wound around a pulley that is rotatably supported, and the movement of the float that follows the rise and fall of the liquid level is controlled as described above. The present invention relates to an improvement of a float-type liquid level gauge that measures the liquid level from the rotational angular displacement of a pulley.

Conventional float-type liquid level gauges of this type do not have a mechanism to easily calibrate the liquid level, and for maintenance after installation, it is necessary to first remove the float, weight, and rope from the liquid tank and then rotate the pulley. , or by rotating the pulley with the float, weight, and rope attached, giving the pulley a rotation corresponding to a constant liquid level, and converting the rotation into an electrical signal via its shaft, such as a potentiometer. ,
The output signal was calibrated. With this calibration method, removing the float, weight, and rope is cumbersome and requires a lot of manpower, and if you rotate the pulley with the float, weight, and rope still attached, you may accidentally remove your hand from the pulley midway. However, there were drawbacks such as the weight falling to the liquid level and having to recalibrate from the beginning.

An object of the present invention is to provide a float-type liquid level gauge that eliminates the above-mentioned drawbacks and is easy to calibrate. For this reason, the present invention has a handle fixed to a handle rotation shaft that can be freely separated from the pulley shaft, and only during calibration, the pulley shaft and the handle rotation shaft can be connected and the pulley can be arbitrarily rotated by the handle. In addition, a scale display board is provided to enable accurate reading of the amount of vertical movement of the float due to the rotation of the handle, and a zero position display board is provided on which the liquid level during calibration can be set on the scale display board, making the calibration work more reliable and accurate. The intended purpose was achieved by equipping the float type liquid level gauge with a calibration mechanism that facilitates calibration.

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 a, b and Fig. 2 a, b show an embodiment of a float type liquid level gauge according to the present invention.
Figure 1a is a side view showing the whole, Figure 1b is a view taken in the direction of arrow A in Figure 1a, and Figures 2a and b are a plan view and side sectional view showing details of section B in Figure 1a. It is. In Fig. 1a, 1 is the liquid level gauge body with built-in potentiometer etc., 2 is the pulley, 3 is the pulley shaft, 4 is the rope wound around the pulley 2, and 5 is the rope 4.
Float suspended at one end, 6 is rope 4
A weight is suspended from the other end, 7 is a liquid tank, and 8 is a liquid level. As shown in FIG. 1b, the liquid level gauge main body 1 is provided with a mechanical or electrical field indicator 9 directly connected to the pulley shaft 3 to indicate the liquid level. 11 is a mounting bracket, 12 is a mounting bracket 11
a handle rotation axis pivoted for axial movement in the
A handle 13 is fixed to the handle rotation shaft 12 and has a pointer 13a. 14 is a bevel gear fixed to the handle rotation shaft 12, and 15 is a bevel gear fixed to the pulley shaft 3. Bevel gear 14 and bevel gear 1
5 can be engaged or disengaged by moving the handle rotation shaft 12 in the axial direction.

As shown in Figure 2 a and b, the handle rotation axis 1
The second axial movement mechanism moves the handle rotation axis 1 relative to the bearing 17 in the bearing box 16 provided in the mounting bracket 11.
2 to be slidable in the axial direction, a spring 19 is inserted between the flange 18 formed on the handle rotation shaft 12 and the mounting bracket 11, and the repulsive force of the spring 19 moves the handle rotation shaft 12 downward in the figure, and the flange The bevel gear 14 and the bevel gear 15 mesh with each other with the bevel gear 18 in contact with the bearing 17. The handle 13 also has a handle rotation shaft 12.
A mesh release lock screw 20 is provided to pull up the bevel gear and lock it in the disengaged state. When this mesh release lock screw 20 is screwed in, the handle rotation shaft 12 moves upward in the figure while compressing the spring 19. Then, the meshing between the bevel gear 14 and the bevel gear 15 is released and locked in this state. That is, the above 12, 14, 15, 16, 17, 1
8, 19, and 20 form shaft separating means. Furthermore, in FIG. 2b, a rotation lock mechanism 21 for locking the rotation of the handle rotation shaft 12 is attached to the lower part of the bearing box 16 as shown in the drawing. Rotation lock mechanism 21
For example, the handle rotation shaft 12 is inserted into a block shape with a notch formed in one place, and the handle rotation shaft 12 is tightened by tightening or loosening a screw perpendicular to the notch. Those with a structure that locks or releases rotation, or ratchets that can be switched between clockwise and counterclockwise rotation using a lever, are used.

Further, a disk-shaped scale display plate 22 is attached to the upper surface of the mounting bracket 11 in the drawing. On this scale display plate 22, when the handle 13 is rotated once, the pulley 2 rotates via the bevel gears 14 and 15. A scale 23 is displayed that divides the displacement into equal parts as appropriate. Further, a zero position display plate 24 is provided coaxially and rotatably along the scale 23 of the scale display plate 22. The zero position display board 24 is provided with a locking knob 25, and the zero position indicator 2 of the zero position display board is placed on the scale 23 corresponding to the zero position of the liquid level.
4a and tighten the locking knob 25 to set it.

Next, a calibration operation of a float type liquid level gauge according to an embodiment of the present invention, which is equipped with the calibration mechanism 10 configured as described above, will be explained. During normal measurement, the calibration mechanism 10 screws in the mesh release lock screw 20, compresses the spring 19, and pulls the handle rotating shaft 12 upward in the figure to release the mesh between the bevel gears 14 and 15. It is locked. Therefore, no load is applied to the rotation of the pulley 2 at all.

During calibration, when the mesh release lock screw 20 is loosened, the handle rotation shaft 12 is lowered by the repulsive force of the spring 19, and the bevel gears 14 and 15 are brought into mesh with each other.
Now, by turning the handle 13, the pulley 2 can be easily rotated, and the float 5 can be raised and lowered via the rope 4. The float 5 corresponds to the rotational angular displacement of the handle 13.
The amount of movement for raising or lowering is determined by the pointer 13 on the handle.
It can be read from the scale display plate 22 by a. If the liquid level at the time of calibration was at position C on the scale display plate 22 in Figure 2a, the locking knob 25
, turn the zero point display plate 24 to set the zero point indicator 24a to position C, and then turn the locking knob 25.
Tighten to set the zero position. Using this zero position as a reference point, turn the handle 13 from the C position to a scale position corresponding to 1 m while looking at the scale display plate 22, read the output signal value of the potentiometer at that time with the meter, and at the same time read the output signal value of the potentiometer with the field indicator 9. Check the liquid level and perform calibration. In the same way, rotate the handle a predetermined number of times to calibrate several points up to full span. To check whether the liquid level is truly zero, turn the handle 13 in the opposite direction while looking at the scale display plate 22 by the amount corresponding to the actual liquid level at the time of calibration at the above-mentioned position C, and then adjust the potentiometer at that time. The output signal value is read by the meter, and at the same time, the liquid level is checked by the on-site indicator 9 to perform zero point calibration. In the calibration operation, once the handle 13 has been rotated a predetermined amount, the rotation of the handle is locked by the rotation lock mechanism 21, thereby making it possible to accurately read the output value of the potentiometer and the indication of the on-site indicator, and to prevent the float from being accidentally turned. This prevents mistakes such as falling. After the calibration is completed, the handle rotation shaft 12 is raised by screwing in the mesh release lock screw 20, and the mesh between the bevel gears 14 and 15 is locked in the released state, so that no load is applied to the rotation of the pulley 2. The state can be restored and normal measurement operation can be started.

As mentioned above, according to the float type liquid level gauge according to the present invention, it is not necessary to remove the float, weight, rope, etc. during calibration, and the pulley can be easily rotated by an arbitrary amount using the handle, and the rotation can be locked at any time. This prevents operational errors and improves safety. Further, since the scale display plate allows the handle to be rotated accurately by a desired amount, the accuracy of calibration is improved. Furthermore, since the calibration mechanism can be easily separated from the pulley shaft, it is easy to switch between the calibration state and the measurement operation state, and in the measurement operation state, the calibration mechanism is completely released from the pulley shaft.
No load is applied to the rotation of the pulley and measurement accuracy is not compromised.

Incidentally, as a transmission means between the handle rotation shaft and the pulley shaft in the calibration mechanism, a spur gear 34 and a spur gear 35 may be used as shown in FIG. In the structure shown in FIG. 3, the spur gear 34 is movable in the axial direction with respect to the handle rotation shaft 32, and during calibration, it is meshed with the spur gear 35 of the pulley shaft 3 at the position shown in the figure and fixed with a nut 36. During measurement operation, the spur gear 34 is moved upward in the figure to disengage the spur gear 35 and fixed with a nut 36. Furthermore, the transmission is not limited to gears, but also a chain.

[Brief explanation of the drawing]

Figures 1a and 1b show an embodiment of the float type liquid level gauge according to the present invention. Figure 1a is a side view showing the whole, and Figure 1b is the main body of the level gauge shown in Figure 1a. A view taken in the direction of arrow A, and FIGS. 2a and 2b are a plan view and a side sectional view showing details of section B in FIG. 1a, respectively, and FIG. 3 is a plan view showing a modified example of the calibration mechanism. 1...Liquid level gauge body, 2...Pulley, 3...Pulley shaft, 4...Rope, 5...Float, 6...
Weight, 9... Field indicator, 10... Calibration mechanism, 11
...Mounting bracket, 12,32...Handle rotation axis,
13...Handle, 13a...Pointer, 14, 15
...Bevel gear, 20...Match release lock screw, 21
... Rotation lock mechanism, 22 ... Scale display plate, 23
...Scale, 24...Zero display plate, 25...Lock knob, 34, 35...Spur gear.

Claims (1)

[Scope of utility model registration request] A float and a weight are suspended from both ends of a rope wrapped around a rotatably supported pulley, and the movement of the float, which follows the rise and fall of the liquid level, is converted into rotation of the pulley, and the liquid changes from the rotational angular displacement. In a float-type liquid level gauge for measuring position, the bundle has a rotating shaft that can be detached from the pulley shaft of the pulley, and a shaft that connects and detaches the handle rotating shaft and the pulley shaft and maintains the coupled state or detached state. a separating means, a rotation lock mechanism for locking the rotation of the handle rotation shaft, and a rotation lock mechanism that is fixedly disposed around the rotation shaft of the handle, and the pulley shaft is rotated by rotation of the handle in a state where the handle rotation shaft and the pulley shaft are coupled. , a scale display plate having a scale indicating the amount of vertical movement of the float that is raised and lowered via a rope, and a scale display plate that rotates in accordance with the rotation of the rotation axis of the handle and has the scale corresponding to the amount of vertical movement of the float. A pointer to be indexed, a scale position of the scale display plate corresponding to a float position located on the liquid surface in a state where the handle rotation axis and the pulley shaft are combined, and which can be rotated to the rotation axis of the handle. A float-type liquid level gauge characterized in that it is equipped with a calibration mechanism having a zero position display plate that can be attached.