JP2012081447A - Deposit scraping apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect sagging of a chain at the downstream side of a driving sprocket with high accuracy.SOLUTION: A plurality of flights 9 are attached to a chain 2 circulating in a tank 1 along the circulation direction of the chain 2, a part of the chain 2 is stretched along the bottom of the tank 1 by a first sprocket 3 and a second sprocket 4 and the chain 2 is sent out toward the first sprocket 3 by the driving sprocket 5 which is arranged at a position above the first sprocket 3 and apart in a horizontal direction. The chain 2 sags between the driving sprocket 5 and the first sprocket 3 at the downstream side in the circulation direction thereof and the sagged part is supported and guided by a guide rail 10 via the flight 9. When the sagging amount of the chain 2 increases, the grounding point of the flight 9 toward the guide rail 10 is moved to a side apart from the first sprocket 3 and a detecting means 50 detects it.

Description

  The present invention relates to a deposit scraping device that scrapes deposits deposited on the bottom of a tank.

  Conventionally, as a scraping device that scrapes sediment deposited on the bottom of a tank such as a sedimentation basin, a plurality of plate-like flights (scraping blades) are attached to an endless chain stretched between the bottom of the tank and the water surface. A so-called chain flight type scraping device is known in which this flight is made to circulate along a circular orbit along the bottom surface of the tank, and the deposit accumulated on the bottom of the tank is scraped.

  In such a chain flight type scraping device, if the chain is loosened more than a predetermined amount on the downstream side of the driving sprocket in the circular orbit of the chain, the chain and the sprocket do not normally mesh with each other, and the chain may be broken. There is a case. Therefore, in the detection device described in Patent Document 1 below, a rotatable lever is provided between the drive sprocket wheel and a driven sprocket wheel provided on the downstream side of the drive sprocket wheel and below the chain. When the chain slacks and hangs down by a predetermined amount, the chain pushes the tip of the lever to rotate the lever, and the rotated lever activates the switch of the alarm device.

Japanese Utility Model Publication No. 55-49733

  However, in the detection device described in Patent Document 1, since the amount of chain drooping between two consecutive flights is measured as the amount of slack in the chain, the amount of measurement is small, and there is a risk of erroneous detection. .

  The present invention has been made to solve such problems, and provides a scraping device that can detect the slack of the chain on the downstream side of the drive sprocket with high accuracy. Objective.

  The deposit scraping device according to the present invention includes a scraping blade for scraping the deposit deposited on the bottom of the tank, and a first driven sprocket that orbits the inside of the tank and a part thereof is along the bottom of the tank. And an endless chain that is stretched by a second driven sprocket and has a plurality of scraping blades attached along the circumferential direction, and is disposed at a position spaced above the first driven sprocket in the horizontal direction. A driving sprocket that is fed toward the driven sprocket, a guide rail that supports and guides the endless chain slacked between the driving sprocket and the first driven sprocket in the horizontal direction via the scraping blades, Detecting means for detecting a ground contact point with respect to the guide rail of the vane blade.

  According to the present invention, a plurality of scraping blades are attached to the endless chain that circulates in the tank along the rotating direction, and a part of the endless chain is attached to the bottom of the tank by the first driven sprocket and the second driven sprocket. The endless chain is sent out toward the first driven sprocket by the drive sprocket that is stretched along the first drive sprocket and disposed at a position above the first driven sprocket and in the horizontal direction. Therefore, the endless chain is slackened between the driving sprocket and the first driven sprocket, that is, on the downstream side in the circumferential direction of the driving sprocket, and is supported by the guide rail via the scraping blade and guided in the horizontal direction. And since the contact point of the scraping blade with respect to the guide rail is detected by the detection means, the amount of looseness of the endless chain increases and the contact point of the scraping blade with respect to the guide rail moves to the side away from the first driven sprocket. Then, the slack of the endless chain can be detected based on the contact point. In this way, the contact point of the scraping blade with respect to the guide rail according to the amount of looseness of the endless chain between the driving sprocket and the first driven sprocket is detected, and the looseness of the endless chain is detected based on this contact point. Therefore, the amount of slack to be detected is larger than that of the detection device described in Patent Document 1 that detects slack between flights, and the slack of the chain on the downstream side of the drive sprocket is detected with high accuracy. be able to.

  Here, when a part of the endless chain is configured to include a third driven sprocket disposed between the driving sprocket and the first driven sprocket so as to follow the water surface formed in the tank, the driving The scum floating on the water surface can be scraped and discharged between the sprocket for use and the third driven sprocket.

  The detection means has a striker that is rotatably supported and a link rod that moves up and down as the striker rotates, and the striker contacts the scraping blade at a point of contact with the guide rail of the scraping blade. In addition, the amount of looseness of the endless chain may be detected by rotating as the ground contact point moves according to the amount of looseness of the endless chain.

  ADVANTAGE OF THE INVENTION According to this invention, the scraping apparatus of the deposit which can detect the slack of the chain of the downstream of a drive sprocket with high precision can be provided.

It is a schematic side view which shows the scraping apparatus which concerns on 1st embodiment of this invention. It is an II-II arrow line view of FIG. It is an enlarged view explaining operation | movement of the scraping apparatus shown in FIG. It is a schematic side view which shows the scraping apparatus which concerns on 2nd embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a deposit scraping apparatus according to the invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

  FIG. 1 is a schematic side view showing a scratching apparatus according to a first embodiment of the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and this scraping apparatus 100 is, for example, a sedimentation tank of a sewage treatment plant Etc. are provided inside.

  As shown in FIG. 1, the scraping device 100 includes a pair of main body chains (endless chains) 2 and 2 that circulate inside the tank 1, and the pair of main body chains 2 and 2 has a width of the tank 1. They are spaced apart in the direction (perpendicular to the page). A pair of first sprockets (first driven sprockets) 3 and 3 that are separated in the width direction and connected by a shaft are provided on the lower one side (right side of the page) of the tank 1, and the other lower side (left side of the page) ) Is provided with a pair of second sprockets (second driven sprockets) 4 and 4 which are separated in the width direction and connected by a shaft. The main body chain 2 is stretched over the first sprocket 3 and the second sprocket 4 along the bottom of the tank 1.

  A pair of drive sprockets 5 and 5 that are spaced apart in the width direction and connected by shafts are disposed on the other upper side of the tank 1, that is, above the first sprocket 3 and in the horizontal direction (above the second sprocket 4). Is provided. Further, at the substantially upper central portion of the tank 1, that is, between the driving sprocket 5 and the first sprocket 3 and spaced apart in the horizontal direction of the driving sprocket 5, they are separated by a width direction and connected by a shaft. A pair of third sprockets (third driven sprockets) 6 and 6 are provided. The main chain 2 spanned between the first sprocket 3 and the second sprocket 4 is further spanned over the drive sprocket 5 and the third sprocket 6, and a portion between the drive sprocket 5 and the third sprocket 6. Is arranged along the water surface formed in the tank 1.

  A motor 7 is installed on the upper surface of the side wall of the tank 1 and above one of the drive sprockets 5. The motor 7 can drive the drive sprocket 5 via a drive chain 8. Then, the driving sprocket 5 driven by the motor 7 sends the main body chain 2 from the driving sprocket 5 toward the third sprocket 6, and the main body chain 2 includes the driving sprocket 5, the third sprocket 6, and the first sprocket. 3. Move the orbit around the second sprocket 4 and return to the driving sprocket 5.

  As shown in FIGS. 1 and 2, the main body chain 2 has an attachment 21 that protrudes outward in the circulation direction (upward in the upper track in FIG. 1 and lower in the lower track in FIG. 1). A plurality of flights (scratching blades) 9 having a U-shaped cross section extending in the width direction are connected to the attachments 21 and 21, respectively. Both ends of the flight 9 further project outward in the width direction (right side in FIG. 2) from the attachment 21, and resin shoes 91 are attached to the projecting portion. Then, the flight 9 moves along the bottom of the tank 1 and the water surface as the main chain 2 circulates, and scrapes the deposits accumulated on the bottom of the tank 1 to the collection pit 1A provided at the bottom of the tank 1. In addition to collecting, the scum floating on the water surface is scraped and collected in a collecting rod (not shown) in the vicinity of the third sprocket 6.

  A pair of guide rails 10 and 10 extending toward the second sprocket 4 are provided in the vicinity of the outer side in the width direction of the first sprocket 3. This guide rail 10 is for supporting and guiding the main chain 2 slackened on the first sprocket 3 side in a horizontal direction via the flight 9 between the third sprocket 6 and the first sprocket 3. The shoe 91 located on the first sprocket 3 side is placed between the third sprocket 6 and the first sprocket 3.

  Further, the scraping device 100 is provided with detection means 50, and the detection means 50 is constituted by a striker 11, a link rod 12, a sensor 13, and a weight 14.

  As shown in FIG. 2, the striker 11 is an elongated plate having an L-shaped cross section, a portion on the first sprocket 3 side is located between the guide rail 10 and the body chain 2, and an end portion of the striker 11 is a guide rail. 10 is located below the upper surface of the apparatus 10 and is provided so as to be inclined so that the rear part thereof is positioned obliquely upward as shown in FIG. The striker 11 is supported at the fulcrum M so that the width direction of the tank 1 can be rotated in the axial direction, and is in contact with the flight 9 grounded to the guide rail 10. Then, when the amount of looseness of the main chain 2 increases and the ground contact point of the flight 9 with respect to the guide rail 10 moves away from the first sprocket 3, the striker 11 rotates clockwise in FIG.

  The link rod 12 is connected to the end of the striker 11 on the second sprocket 4 side and extends to a sensor 13 installed on the upper surface of the side wall of the tank 1, and moves up and down as the striker 11 rotates. The sensor 13 detects the vertical movement of the link bar 12. A weight 14 for maintaining the balance of the striker 11 is attached to the lower end of the link bar 12.

  A pair of return rails 15, 15 extending toward the third sprocket 6 is provided from the vicinity of the driving sprocket 5. The return rail 15 is for supporting the main chain 2 between the drive sprocket 5 and the third sprocket 6 via the flight 9 and guiding it in the horizontal direction.

  FIG. 3 is an enlarged view for explaining the operation of the scraping device shown in FIG. 3A shows a state where the amount of slackness of the main chain 2 is appropriate, and FIG. 3B shows a state where the amount of slackness of the main chain 2 is greater than or equal to a predetermined value.

  In such a scraping device 100, the driving sprocket 5 is driven by the motor 7, and the body chain 2 travels around the driving sprocket 5, the third sprocket 6, the first sprocket 3, and the second sprocket 4 to the driving sprocket 5. Around the returning orbit, the flight 9 moves along the bottom and the water surface of the tank 1 along with this rotation, and collects the sediment deposited on the bottom of the tank 1 and the scum floating on the water surface. During this time, as shown in FIG. 3 (a), the main chain 2 is slackened between the third sprocket 6 and the first sprocket 3, that is, on the downstream side in the circumferential direction of the driving sprocket 5. And is guided in the horizontal direction. The striker 11 is in contact with the flight 9 that is grounded to the guide rail 10.

  As shown in FIG. 3 (b), when the amount of looseness of the main chain 2 increases, the contact point of the flight 9 with respect to the guide rail 10 moves to the side away from the first sprocket 3 according to the amount of looseness. Accordingly, the contact position between the striker 11 and the flight 9 grounded on the guide rail 10 also moves to the side away from the first sprocket 3, and the striker 11 rotates clockwise in the figure. When the striker 11 rotates, the link rod 12 moves upward and is detected by the sensor 13, and the contact point of the flight 9 with respect to the guide rail 10 is known from the amount of movement, so that the slack of the main chain 2 can be detected.

  In this way, the contact point of the flight 9 with respect to the guide rail 10 according to the amount of slack of the main body chain 2 between the drive sprocket 5 and the first sprocket 3 is detected, and the slack of the main body chain 2 is detected based on this contact point. Therefore, the amount of slack detected is larger than that of the detection device described in Patent Document 1 that detects slack between flights, and the slack of the main chain 2 on the downstream side of the drive sprocket 5 is increased. It can be detected with accuracy.

  Further, the scraping device 100 includes a third sprocket 6 disposed between the drive sprocket 5 and the first sprocket 3 so that a part of the main body chain 2 is along the water surface formed in the tank 1. Therefore, the scum floating on the water surface between the drive sprocket 5 and the third sprocket 6 can be scraped and discharged.

  Next, a scraping device according to a second embodiment of the present invention will be described.

  FIG. 4 is a schematic side view showing the scraping device according to the second embodiment of the present invention.

  The scratching device 200 is different from the scratching device 100 according to the first embodiment shown in FIG. 1 in that the third sprocket 6 is eliminated and the main chain 2 is changed from four-point support to three-point support. . Along with this, the driving sprocket 5 is moved to the substantially upper central portion of the tank 1, and the return rails 15 and 15 are eliminated.

  It goes without saying that such a scraping device 200 can detect the slackness of the main body chain 2 on the downstream side of the drive sprocket 5 with high accuracy, like the scraping device 100 according to the first embodiment.

  In addition, this invention is not limited to the said embodiment. For example, in the present embodiment, the sensor 13 can detect the vertical movement when the striker 11 rotates and the link bar 12 moves up and down. However, the sensor 13 is not provided, and the link bar 12 is simply moved up and down. The amount of slack may be detected by looking. Further, when the striker 11 rotates, the alarm buzzer switch is pushed by the rotation, and the alarm buzzer sounds.

  DESCRIPTION OF SYMBOLS 1 ... Tank, 2 ... Main body chain (endless chain), 3 ... First sprocket (first driven sprocket), 4 ... Second sprocket (second driven sprocket), 5 ... Drive sprocket, 6 ... Third sprocket (Third driven sprocket), 9 ... flight (scratching blade), 10 ... guide rail, 50 ... detection means, 100, 200 ... scraping device.

Claims (3)

Scraping blades that scrape the sediment deposited on the bottom of the tank;
Endlessly circulated in the tank, stretched by a first driven sprocket and a second driven sprocket so that a part thereof is along the bottom of the tank, and a plurality of the scraping blades are attached along the rotating direction Chain,
A drive sprocket that is disposed above the first driven sprocket and spaced apart in the horizontal direction, and that feeds the endless chain toward the first driven sprocket;
A guide rail that supports and guides the endless chain slackened between the driving sprocket and the first driven sprocket in a horizontal direction via the scraping blades;
Detecting means for detecting a contact point of the scraping blade with respect to the guide rail;
Sediment scraping device comprising:   The third driven sprocket disposed between the driving sprocket and the first driven sprocket so that a part of the endless chain is along a water surface formed in the tank. Scraping device for sediment. The detection means includes
A striker supported rotatably,
A link rod that moves up and down by rotating the striker;
The striker contacts the scraping blade at a contact point of the scraping blade with respect to the guide rail, and rotates as the contact point moves according to the amount of looseness of the endless chain. 3. The deposit scraping apparatus according to claim 1, wherein the amount of slack is detected.

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