JP3740073B2 - Rotary level detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary level detection device for detecting the level of a granular object to be measured such as cement or wheat flour in a container.
[0002]
[Prior art]
A conventional example of this type of rotary level detector will be described. FIG. 6 is a side sectional view of a rotary blade of a conventional level detecting device, and FIG. 7 is a side sectional view showing a state when the rotary blade is inserted into the container and taken out of the container. In FIG. 6, the rotary level detection device 1 is supported by a rotating shaft 7 driven by a motor (not shown) and a front end of the rotating shaft 7 via a support member 50, and through an insertion hole C2 provided in a side wall C1 of the container C. A rotating blade 5 to be inserted is provided.
[0003]
The rotary blade 5 includes a pair of blade pieces 51 and 51. A support shaft 52 having an axis in a direction orthogonal to the axis X1 of the rotating shaft 7 is fixed to the support member 50, and blades 51, 51 are rotatably supported by the support shaft 52. . A spring member 53 for applying a spring force is wound around the support shaft 52 in a direction P in which each blade piece 51 is rotated backward, and each end thereof is locked to the blade piece 51. Each of the blade pieces 51 has a stopper piece 54 that is pressed against a part of the support member 50 by the spring member 53 and regulates the rearward rotation position of each blade piece 51. A part of the rear edge of the blade piece 51 is cut and raised.
[0004]
When the rotary blade 5 is set in the container C, the blade pieces 51 are turned to the front side and folded as shown by an arrow Q against the spring member 53 so that the blade pieces 51 overlap each other. As shown in FIG. 7, the container C is inserted through the insertion hole C2. When it passes through the insertion hole C2 and reaches the container C, the pressing force against the spring member 53 by the insertion hole C2 is released, and each blade piece 51 is rotated backward by the spring force, and each blade piece. A stopper piece 54 provided on 51 is pressed against the support member 50, and as shown in FIG. 6, each blade piece 51 is fixed in a state where it is pushed and spread so as to protrude in the radial direction with respect to the rotating shaft 7. . In this state, when the level of the object to be measured in the container C reaches the detection level, each blade piece 51 comes into contact with the object to be measured, and a rotational load is generated. It is detected that the level has reached the rotary blade 5.
[0005]
Further, when performing the maintenance work of the rotary blade 5 and the like, when the rotary blade 5 is taken out of the container C, the trailing edge of each blade piece 51 is drawn by pulling the rotary shaft 7 outward as shown in FIG. Is pressed against the insertion hole C2 of the container C, whereby each blade piece 51 is taken out from the insertion hole C2 of the container C while being folded forward against the spring member 53.
[0006]
[Problems to be solved by the invention]
However, in the above configuration, since the stopper piece 54 that regulates the rearward rotation position of each blade piece 51 is formed by cutting a part of the rear edge of the blade piece 51, the blade piece 51. A rectangular concave groove 54a is formed at a portion where the stopper piece 54 is formed. For this reason, the concave groove 54a is caught on the edge of the insertion hole C2, and the rotary blade 5 may not be smoothly inserted into the container C and taken out of the container.
[0007]
The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to reliably and smoothly insert and remove the rotary blades into and from the container when the rotary level detector is attached to or removed from the container. To do.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a rotating blade is attached to the front end of a rotating shaft driven by a motor, and the rotating blade is brought into contact with an object to be measured in the container to measure the rotational load. A rotary type level detecting device for detecting a level of an object, wherein the rotary blade comprises a pair of blade pieces, and a support shaft extending in a direction perpendicular to the axis is provided on the rotary shaft. The pair of blade pieces is rotatably supported on the support shaft, and a spring member for applying a spring force in the direction of rotating the pair of blade pieces rearward is wound around the support shaft. A stopper piece that is pressed against the rotating shaft by the spring force and restricts the rearward rotation position of the blade piece is formed at a position separated from the front.
[0009]
According to this configuration, since the stopper piece that regulates the backward rotation position of the blade piece is formed at a position spaced forward from the trailing edge of the blade piece in the rotation direction, the rotary level detection device is When attaching or detaching the rotating blade to or from the container, the stopper piece is not caught on the edge of the insertion hole when the rotating blade is inserted into or removed from the insertion hole. In other words, each blade piece of the rotating blade is rotated by pulling the rotating shaft outward when passing through the insertion hole while being folded forward by hand against the spring member. When the rear edge of each blade piece of the blade is brought into strong contact with the insertion hole of the container and the blade piece is forcibly folded against the spring member by the pulling force, and is taken out from the insertion hole, Each blade piece does not get caught in the insertion hole, and the entire trailing edge of each blade piece is reliably and smoothly inserted into the container while being guided by the insertion hole. It is taken out.
[0010]
The stopper piece is preferably formed by cutting and raising a part of the blade piece. According to this, formation of a stopper piece becomes easy.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view of a rotary level detection apparatus according to an embodiment of the present invention. The rotary level detection device 1 is attached to, for example, the side wall C1 of the container C and detects the level of the object M to be measured, and is coupled to the motor 2 and its output shaft 3 via a joint 4. The rotary shaft 7 is mounted at the front end of the rotary shaft 7 and accommodates a part of the plate-like rotary blade 5, the motor 2, the joint 4, and the rotary shaft 7 inserted into the inside through the insertion hole C2 provided in the side wall C1 of the container C. And a limit switch 15 for detecting a load fluctuation of the rotary shaft 7. The motor 2 is supported so as to be rotatable with respect to the front and rear first and second frames 13 and 14. The first frame 13 is fixed to the apparatus case 10, and the second frame 14 is fixed to the first frame 13. When a rotational torque of a certain level or more is applied to the rotating shaft 7 of the motor 2, the reaction causes the housing (stator) 20 of the motor 2 to rotate relative to the rotating shaft 7 in the counter-rotating direction. The operating element 21 fixed to the housing operates the limit switch 15 supported by the first frame 13.
[0012]
The rotating shaft 7 is supported by the bearing portion 11 of the case 10 via a metal bearing 11a and a ball bearing 11b in a state where the rotating shaft 7 is sealed by an oil seal portion 8 and a cap nut 9. Further, in the illustrated embodiment, a support flange F is attached around the insertion hole C2 by welding outside the side wall C1, and an attachment flange 10a provided around the bearing portion 11 is brought into contact with the support flange F, thereby supporting the support flange. The space between F and the mounting flange 10a is fastened and fixed with bolts B and nuts N.
[0013]
2 is an enlarged bottom view of the rotary blade 5 shown in FIG. 1 as viewed from below, FIG. 3 is a side view showing one of the pair of blade pieces 51, 51 constituting the rotary blade 5, and FIG. It is sectional drawing along IV. The basic structure of the rotary blade 5 is the same as that of the conventional example shown in FIG. 6 and FIG. 7, and only the formation positions of the stopper pieces 55 provided on the blade pieces 51 are different. Detailed description thereof will be omitted.
[0014]
As shown in FIG. 3, the blade piece 51 has a rotational axis centered at a middle position in the width direction near its one side (center side) in the length direction, that is, in the operating state along the radial direction of the rotational shaft 7. A shaft hole 56 for passing a support shaft 52 having an axis orthogonal to X1 is formed. The shaft hole 56 is slightly separated from the rear edge 51a of the blade piece 51 toward the front side near the shaft hole 56, and from the front edge 51b. A stopper piece 55 is formed at an inner position that is far away, that is, at an inner position in the rear half of the blade piece 51.
[0015]
As shown in FIG. 4, the stopper piece 55 is formed by cutting and raising a part of the blade piece 51. In FIG. 3, reference numeral 57 denotes a locking hole for the spring member 53 formed in the blade piece 51. Further, as shown in FIG. 2, a spacer 58 through which the support shaft 52 is inserted is interposed between the blade pieces 51, and the spring member 53 is wound around the spacer 58, and both end portions 53a thereof are provided. Is locked in the locking holes 57 (FIG. 3) of the pair of blade pieces 51, 51.
[0016]
Next, the operation of the above rotary level detection device 1 will be described.
First, when the rotary blade 5 is set in the container C when the rotary level detection device 1 shown in FIG. 1 is attached to the container C, each blade piece 51 is rotated to the front side Q and folded as in the prior art. In this state, it is inserted into the container C through the inside of the support flange F and the insertion hole C2 of the container C. In the container C, each blade piece 51 is rotated backward P by the spring force of the spring member 53, and a stopper piece 55 provided on each blade piece 51 is pressed against a part of the support member 50, The blade piece 51 is fixed in an expanded state in which it is pushed out so as to protrude in the radial direction.
[0017]
In this state, when the level of the object M stored in the container C does not reach the detection level (position of the rotary blade 5), the rotary blade 5 is moved by the motor 2 via the rotary shaft 7 in FIG. In the A direction with a slight rotational load (rotational torque). When the level of the object to be measured M reaches the detection level, the object to be measured M comes into contact with the rotary blade 5 and becomes a load with respect to the rotation of the rotary shaft 7, and the load becomes a predetermined magnitude. Then, the casing 20 of the motor 2 is rotated in the direction opposite to the rotation direction A, the limit switch 15 is operated, and it is detected that the object M to be measured has reached a predetermined level. In response to the detection signal from the limit switch 15, the driving of the motor 2 is stopped by a motor control circuit (not shown).
[0018]
FIG. 5 shows a state in which the rotary shaft 5 is inserted into and removed from the container C by inserting and removing the rotary shaft 7 into and from the insertion hole C2 of the container C. The operation when the rotary blade 5 is taken in and out of the container C is the same as the conventional one. That is, when putting into the container C, the blade pieces 51 of the rotary blade 5 are turned against the spring member 53 so as to overlap each other, as shown by the arrow Q, in a folded state, The container C is inserted through the insertion hole C2.
[0019]
When carrying out maintenance work of the rotary blade 5 and taking out the rotary blade 5 to the outside of the container C, the bolt B and the nut N of FIG. 1 are removed, and the rotary shaft 7 is pulled out while holding the case 10. As shown in FIG. 5, the trailing edge 51 a of each blade piece 51 is pressed against the insertion hole C <b> 2 of the container C by pulling out the rotating shaft 7, thereby causing each blade piece 51 to resist the spring member 53 and move forward. It is taken out to the outside through the inside of the flange F from the insertion hole C <b> 2 of the container C while being rotated and folded by Q.
[0020]
Here, since the stopper piece 55 that regulates the rearward rotation position of the blade piece 51 is formed at an inward position away from the rear edge 51a of the blade piece 51, the rotary blade 5 can be taken in and out. When the trailing edge 51a of each blade piece 51 comes into contact with the insertion hole C2 at this time, the stopper piece 55 does not get caught on the edge of the insertion hole C2, and the entire rotary blade 5 is reliably and smoothly attached to the container C. Can be inserted and removed.
[0021]
【The invention's effect】
As described above, the rotary level detection device of the present invention can reliably and smoothly put the rotary blades in and out of the container when attaching to the container or removing from the container.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a rotary level detection device according to an embodiment of the present invention.
FIG. 2 is an enlarged bottom view of the rotating blade of FIG. 1 as viewed from below.
FIG. 3 is a side view showing one blade piece constituting the rotary blade.
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a side view showing a state when the rotary blade is taken out of the container.
FIG. 6 is a side sectional view showing a conventional rotary level detecting device.
FIG. 7 is a side view showing a state when the rotary blade is taken out of the container in the apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 2 ... Motor, 5 ... Rotary blade, 51 ... Blade piece, 51a ... Trailing edge, 52 ... Support shaft, 53 ... Spring member, 55 ... Stopper piece, 7 ... Rotating shaft, C ... Container, C1 ... Side wall, C2 ... Insertion Hole, M ... measured object, X1 ... axis

Claims (2)

This is a level detection device in which a rotary blade is attached to the front end of a rotary shaft driven by a motor, and the level of the object to be measured M is detected by fluctuations in rotational load caused by the rotary blade coming into contact with the object to be measured in the container. And
The rotary blade is composed of a pair of blade pieces,
The rotation shaft is provided with a support shaft extending in a direction orthogonal to the axis, and the pair of blade pieces are rotatably supported on the support shaft,
A spring member for applying a spring force in a direction to rotate the pair of blade pieces backward is wound around the support shaft,
A rotary level detection device in which a stopper piece that is pressed against the rotating shaft by the spring force and restricts the rotational position of the blade piece to the rear is formed at a position spaced forward from the rear edge of each blade piece. . The rotary level detection device according to claim 1, wherein the stopper piece is formed by cutting and raising a part of the blade piece.

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