JP5633794B2 - Float switch for waste liquid tank - Google Patents

Description

  The present invention is a waste liquid or process liquid containing organic substances generated in the chemical industry, petrochemical industry, pharmaceutical industry, agrochemical manufacturing industry, dye manufacturing industry, pigment manufacturing industry, paint manufacturing industry, waste processing industry, etc. This is related to a tank float switch.

As a conventional float switch for a waste liquid tank, a shaft rod is arranged from above in waste liquid containing organic matter, and a float switch is provided so as to be movable up and down through the shaft rod (see Patent Document 1). This is a magnetic float that has a built-in magnet and moves up and down in response to fluctuations in the liquid level or a change in the specific gravity of the liquid, and a stem that has a built-in switch that guides the vertical movement of the magnetic float and detects the approach of the magnet. Are provided with a plurality of recesses on the surface of the magnetic float that faces the stem portion. The shape of the magnetic float portion ensures the positioning accuracy of the built-in magnet, and smoothly obtains good followability and response to fluctuations in the liquid level or liquid specific gravity.
JP 2008-292162 A

  However, the float switch detects the liquid level by reciprocating the float with the waste liquid on the shaft, and the reciprocation of the float is restricted by the attachment of waste liquid with high oil content or impurities. Therefore, there is a possibility that accurate liquid level detection cannot be performed.

  Therefore, the present invention has an object to provide a float switch for a waste liquid tank capable of performing accurate liquid level detection without being affected by the adhesion of the waste liquid in a waste liquid tank mixed with high-viscosity oil or impurities. To do.

The following measures are taken to solve the above problems.
(1) That is, the float switch for a waste liquid tank according to the present invention is floated on a liquid surface by being suspended by a wire rope 2 at a predetermined feeding position on the liquid surface of the waste liquid tank;
A pulley 3 that is rotatably provided above the liquid level via a shielding plate 6 and that winds and holds the wire rope 2 so that the wire rope 2 can be paid out by turning in the feeding direction;
Pulling means 4 for rotating and biasing the pulley 3 or the wire rope 2 with a predetermined biasing force in a pulling direction in which the float 1 is pulled back;
Detecting means 5 for detecting at least one of a phase angle due to the rotation of the pulley 3 or an extending amount of the extending portion 24 in which the wire rope 2 extends beyond the pulley 3 to the opposite side of the float 1;
The pulley 3 rotates in a partition space partitioned from the tank volume space by the shielding plate 6.
The detecting means 5 detects a liquid level abnormality by contact with either the outer surface above the rotating shaft 3A of the pulley 3 or / and the extending portion 24 where the wire rope 2 extends beyond the pulley 3. It has the contact detection part 50T.

  The waste liquid adhering to the wire rope 2 does not reach the contact part with the pulley 3 or even if it reaches, most of the waste liquid is removed in the holding groove 3D of the pulley 3 and the outer surface above the rotating shaft 3A of the pulley 3 It does not extend to. For this reason, by providing the contact detection unit 50T at the above position, the contact detection unit 50T is isolated in a partition space by the shielding plate 6 and not in contact with the suspended portion of the float 1 or the wire rope 2. The Thereby, it can suppress that the waste liquid of a waste liquid tank adheres to a detection part.

  Further, the liquid level detection operation itself is performed by the pulley operation of the pulley 3 provided above the liquid level, and the pull back force of the float 1 is adjusted by the pull back means 4 at the isolation position, and therefore the influence of the waste liquid adhering to it. It is difficult to receive.

(2) It is preferable that the pulling-back means 4 is comprised from the balance weight suspended so that replacement | exchange is possible ahead of the extending | stretching part 24 extended on the opposite side to the drawing-out direction beyond the contact detection part 50T of the pulley 3. FIG. By using a balance weight that takes into account the mass difference from the float 1, the pull back force by the pull back means can be easily and reliably adjusted.

(3) In the float switch according to any one of the above, it is preferable that the wire rope 2 is fixed to the pulley 3 and fed out and pulled back along the winding peripheral surface. In the embodiment, the upper part of the wire rope 2 accommodated in the groove in the pulley groove 3D opened upward is sandwiched between the fixing bolts 7, so that the rotational movement of the pulley groove 3D is the same as the payout and pullback amount of the wire rope 2. become. By wrapping and fixing the pulley 3 around the rotating peripheral portion, the movement of the wire rope 2 is reliably interlocked with the rotation of the pulley 3 and is not easily affected by the adhesion of the waste liquid.

(4) In any one of the float switches described above, the pulley 3 has a rotating plate that rotates about the rotating shaft 3A that is the rotation center of the pulley 3, and the rotating plate has a predetermined phase range around the rotating shaft. It is preferably an asymmetrical shape having an overhanging portion 31 projecting outward in the inside, and the contact detection unit 50T of the detecting means 5 moves along the outer periphery of the asymmetrical shape to detect the retracted state. In particular, the rotation plate rotates integrally with the pulley groove 3D, and the wire rope 2 fixed on the pulley groove 3D moves integrally, so that the change in the rotation phase of the pulley 3 is caused by the protrusion 31 of the rotation plate. It can be detected reliably and easily by a change in position.

(5) It is preferable to have the shielding board 6 which inserts the wire rope 2 and shields between both components between the float 1 and the pulley 3 of a feeding position. The shielding plate 6 is a portion other than the insertion hole 61H through which the wire rope 2 is inserted, and isolates and isolates the waste liquid storage space in the tank and the feeding space of the pulley 3 to block the waste liquid in the waste liquid tank from entering the detection space. Is. Further, by providing the dipper 61 on the hole surface of the insertion hole 61H on the side of the pulley 3 feeding space, the disconnection and isolation due to the shielding can be made more reliable.

  According to the above means, it is possible to provide a waste liquid tank float switch capable of performing accurate liquid level detection in a waste liquid tank mixed with high-viscosity oil and impurities without being affected by the adhesion of the waste liquid. .

It is front view sectional structure explanatory drawing of the float switch for waste liquid tanks of Example 1 of this invention. FIG. 3 is a side view cross-sectional structure explanatory view of the waste tank float switch of the first embodiment shown in FIG. 1. FIG. 2 is a plan view cross-sectional view of the waste tank float switch of the first embodiment shown in FIG. 1. It is front view structure explanatory drawing which shows the non-operation state of the float switch for waste liquid tanks of Example 1, and an operation state. FIG. 3 is a partially enlarged explanatory view of a pulley 3 in the waste liquid tank float switch according to the first embodiment in a side view. It is front view sectional structure explanatory drawing of the float switch for waste liquid tanks of Example 2 of this invention.

Embodiments of the present invention will be described below with reference to the drawings showing the embodiments. In any embodiment, the waste tank float switch of the present invention basically has
A float 1 that is suspended by a wire rope 2 at a predetermined feeding position on the liquid level of the waste liquid tank and floated on the liquid level;
A pulley 3 rotatably provided above the liquid surface and holding the wire rope 2 so that the wire rope 2 can be fed out by turning in the feeding direction;
Pulling means 4 for rotating and biasing the pulley 3 or the wire rope 2 with a predetermined biasing force in a pulling direction in which the float 1 is pulled back;
The wire rope 2 is provided in the contact detection unit 50T wound in contact with the pulley 3 or in the extension unit 24 of the wire rope 2 extending in the pull-back direction from the contact detection unit 50T. And a detecting means 5 for detecting the amount of the pulled-back state. Hereinafter, each configuration of the embodiment will be described in detail.

  The float switch for waste liquid tank according to the first embodiment shown in FIGS. 1 to 5 uses two rotating arm type contact sensors, a first contact sensor and a second contact sensor, as detection means. By providing rotating arm type contact sensors at different phase positions around the pulley 3, primary detection at the time of warning notification and secondary detection at the time of emergency warning are used in combination. By providing the same rotary arm type contact sensors on the top and side surfaces of the case C in total, the secondary detection phase can be reliably detected when the rotation amount of the pulley 3 exceeds the primary detection phase. It is said.

(Wire rope 2)
The wire rope 2 of Example 1 is extended from the hanging part which suspends the float 1 to the winding part to the pulley 3, or further to the extending part 24 extending to the opposite side of the float 1 beyond the winding part. Elongates continuously. The wire rope 2 is also clamped and fixed between the contact portion and the pulley groove 3D by a fixing bolt 7, and is fed out and pulled back along the winding circumferential surface of the pulley groove 3D as the pulley 3 rotates (FIG. 5). ).

(Pulley 3)
The pulley 3 has a rotating plate that rotates integrally with the pulley groove 3D around the pulley shaft, that is, the rotating shaft 3A. The rotating plate projects outwardly within a predetermined phase range around the rotating shaft. The contact detection part 50T of the detection means 5 moves along the outer periphery of this asymmetric shape, and it detects a pullback state.

  Specifically, the overhanging portion 31 has an arcuate overhanging peripheral portion having a larger diameter than the arcuate peripheral portion other than the overhanging portion, and both sides of the overhanging peripheral portion extend in a substantially parallel manner. The projecting side portion 310 is connected to a small-diameter arc-shaped non-projecting peripheral portion. The rotating plate of the pulley 3 is rotated together with the pulley 3 by the ball bearing 3B around the rotating shaft 3A, and the phase of the protruding portion 31 is changed by the rotation of the rotating plate. When the fixing bolt is penetrated and fixed from the front to the center phase position of the large-diameter arc of the overhanging peripheral portion, the wire rope 2 is fixed in the pulley groove 3D within the phase position where the overhanging peripheral portion is formed. At this time, the change in the phase amount of the pulley 3, that is, the rotating plate, is common to the amount of feeding or the amount of withdrawal due to the winding of the wound wire rope 2.

  And the contact detection part 50T of the detection means 5 rolls on the peripheral side part 311 of this rotating plate, and thus extends over the non-extruding part, the protruding side part 310, and the protruding peripheral part 31 around the rotating plate. The rotary plate is also provided with a mass adjusting hole 3H in the phase range of the overhang portion, and deflects the mass so that the mass of the phase range on the overhang portion side is smaller than the mass of the phase range on the non-overhang portion side. It is adjusted (Fig. 1).

(Retraction means 4)
The pull-back means 4 is composed of, for example, a balance weight hung at the tip of the extending portion 24 that extends beyond the contact detection portion 50T of the pulley 3 to the opposite side to the feeding direction. The balance weight is replaceably attached to the lower front portion of the extending portion 24 inserted through the insertion hole 62H of the second shielding plate 62 projecting outward from the tank. A plurality of balance weights having different masses are prepared in advance, and the mass difference from the float 1 can be exchanged and adjusted in accordance with the viscosity of the surface layer portion of the waste liquid and the amount of change in the liquid level.

(Detecting means 5)
The detection means 5 detects the phase angle of the pulley 3 or the extension amount of the extension part physically or / and electrically by the contact detection unit 50T, and when the pulley 3 reaches a predetermined rotation phase, Alternatively, when the extending portion 24 of the wire rope 2 reaches a predetermined extending amount, a detection signal is electrically transmitted by a transmitting means (not shown), and an abnormality in the tank liquid amount in the waste liquid tank is notified by means of light, sound, etc. To inform.

  As detection means of the embodiment, rotating arm type contact sensors 51 and 52 are used. Specifically, the rotation arm type contact sensor has a detection unit including a rotation arm 50 having a roller type contact detection unit 50T at the tip, and the rotation arm 50 is a rotation of the base end. A rotation biasing force is applied in one direction from the vicinity of the support portion so as to be close to the pulley 3, and the rotating arm 50 receives a reaction force against the rotation biasing force, and the phase angle of the rotation arm is predetermined. When it becomes a thing, it shall transmit a detection signal.

  In the first contact sensor 51 of the first embodiment, the contact detection unit 50T at the tip of the biased turning arm 50 is always in contact with the outer surface (tip surface or outer surface) of the pulley frame 3111/312 of the pulley 3. In the non-operating state, the contact detection unit 50T is in contact with the small-diameter arc-shaped non-extending portion, and the rotating arm 50 faces obliquely downward (FIG. 4a). The pulley 3 rotates in the pull-back direction, and the contact detection unit 50T passes over the overhanging side portion 310 of the overhanging portion 31, so that the contact position of the contact detection unit 50T is pushed upward, and the rotating arm 50 is substantially horizontal from below. Rotation starts in the direction (FIGS. 4a-b). When the pulley 3 further rotates in the pull-back direction and the contact detection unit 50T rides on the large-diameter arc-shaped projecting peripheral portion 31R, the rotating arm 50 faces substantially in the horizontal direction (FIG. 4b). The contact detection unit 5 is adjusted so as to transmit a detection signal when the rotating arm 50 reaches the substantially horizontal direction, so that the phase change of the pulley 3 can be mechanically detected.

  The second contact sensor 52 according to the first embodiment is a secondary detection unit that detects the rotation phase of the pulley 3 that exceeds the detection phase of the first contact sensor 51. By using it in combination, it functions as a backup alarm sensor when the first contact sensor 51 is abnormal.

  Similarly to the first contact sensor 51, the second contact sensor 52 is such that the contact detection unit 50 </ b> T at the tip of the biased rotating arm 50 always contacts the outer surface (tip surface or outer surface) of the pulley frame 311/312 of the pulley 3. ing. In the non-actuated state, the contact detection unit 50T is in contact with the small-diameter arc-shaped non-projecting portion, and the rotating arm 50 faces obliquely downward (FIG. 4ab). The pulley 3 further rotates in the pull-back direction beyond the detection phase of the first contact sensor 51, and the contact detection unit 50T passes over the overhang side portion 310 of the overhang portion 31, so that the contact position of the contact detection unit 50T is on the side. The pivoting arm 50 starts to pivot in a substantially vertical direction from obliquely below. When the pulley 3 further rotates in the pull-back direction and the contact detection unit 50T rides on the large-diameter arc-shaped overhanging peripheral portion 31R, the rotating arm 50 faces substantially in the vertical direction (FIG. 4c).

The contact detection unit 5 is adjusted so as to transmit a detection signal when the rotating arm 50 reaches the substantially vertical direction, so that the phase change of the pulley 3 can be mechanically detected.
The contact detection unit 50T according to the first embodiment is disposed directly above the rotation shaft of the pulley 3 and at a peripheral portion on the extension unit 24 side above the rotation shaft.

  In addition, the detection means 5 may detect the phase angle of the detection means pulley 3 or the position of the extending portion where the wire rope 2 by the pulley 3 extends beyond the pulley to the opposite side of the float 1. For example, the detection means of Example 2 to be described later includes a sheet-like pressure-sensitive contact sensor 8 attached to the withdrawal end portion of the balance weight which is the withdrawal means 4.

(Shield plate 6)
The shielding plate 6 inserts the wire rope 2 between the float 1 and the pulley 3 at the extended position to shield the two parts. The board B is erected on the shielding plate 6, and the pulley 3 and the detection means 5 are disposed above the first insertion hole 61 </ b> H of the shielding plate 6. Further, in the first embodiment, the case C is surrounded so as to prevent malfunction.

  Specifically, a first shielding plate 61 is bolted with a bolt 6 </ b> B as a triangular plate that covers the top plate of the waste liquid tank T, and a second shielding plate 62 is further attached to the upper surface of the first shielding plate 61. A first insertion hole 61H is provided at a hanging position of the wire rope 2, and the wire rope inserted through the first insertion hole 61H moves up and down within a range of the range of the first insertion hole 61H.

  The upper opening of the first insertion hole 61H is provided with an elastic cylindrical dipper 61D whose diameter is reduced upward. When the wire rope 2 is pulled up in the pullback direction, the dipper 61D scrapes off the waste liquid adhering to the rope surface.

The waste tank float switch of the second embodiment shown in FIG. 6 includes a sheet-like pressure sensitive back sensor 8 instead of the second contact sensor 52 of the first embodiment, and a detection sensor mechanism due to overflow. Other configurations not specifically mentioned are the same as those in the first embodiment.

  The detection means of the second embodiment is composed of a sheet-like pressure-sensitive contact sensor 8 attached to the withdrawal end portion of the balance weight which is the withdrawal means 4. When the extension amount of the extension part exceeds a predetermined value and the balance weight moves downward to a position below a predetermined position, a detection signal is transmitted by contacting a contact part previously set at a predetermined position outside the tank and conducting electricity. .

  In the second embodiment, in particular, the outer surface of the horizontal pipe portion of the overflow pipe 91 protruding outside the tank is used as the contact portion. The balance weight is usually installed vertically above the overflow pipe 91 and normally moves up and down at a position where it does not contact the overflow pipe.

  Similar to the first embodiment, the wire rope 2 of the second embodiment contacts the holding groove 3D of the pulley 3, is wound around the pulley 3 and moves to the upper side of the rotating shaft 3A, and then exceeds the pulley 3. It leaves | separates from holding groove | channel 3D and is extended | stretched to the opposite side to the float 1 as the extending | stretching part 24. FIG.

  In addition, the present invention is not limited to the above-described embodiments, and it is possible to appropriately load, delete, replace with substitutes, and separate and extract only some elements without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 1 Float 2 Wire rope 24 Extending part 3 Pulley 3A Rotating shaft 3D Holding groove 31 Overhang part 4 Pull-back means 5 Detection means 50T Contact detection part 6 Shielding plate

Claims (4)

The wire rope, and float suspended in the predetermined feeding position on the liquid level of the waste liquid tank is浮設the liquid surface, are provided rotatably through the shielding plate at the upper liquid surface, the rotational axis has a projecting portion that projects outward at a portion in the phase range around a pulley for holding capable winding feeding the wire rope by the rotation of the feeding direction, the pulley or the wire rope, biasing means for the float rotates urging a predetermined urging force in a direction pullback retracts upward, it comprises a detection means for detecting a phase angle of the pulley by contact with the projecting portion, the pulley but is intended to pivot partitioned by the partition space relative to the tank volume space by the shielding plate located between the float the wire rope is inserted, the Knowledge means, waste tank float switch, characterized in that of the rotation axis of the pulley provided on one of the extension of the upper or the wire rope. In the pulley, a mass adjusting hole is provided in the phase range of the overhang portion, and the mass is deflected so that the mass of the phase range on the overhang portion side is smaller than the mass of the phase range on the non-overhang portion side. The float switch for a waste liquid tank according to claim 1. The said urging | biasing means is comprised from the balance weight suspended so that replacement | exchange was possible at the front of the extending | stretching part extended on the opposite side to the drawing-out direction beyond the contact detection part of the said pulley. Float switch. The float switch according to any one of claims 1 to 3, wherein the wire rope is fixed to the pulley and extended and retracted along a winding peripheral surface.

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