JP4064768B2 - Sand settling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sand settling device for sending sand settling in a sand settling tank to an upstream discharge side in a sand settling tank for settling and classifying sand from slurry.
[0002]
[Prior art]
Conventionally, a sand settling tank for classifying sand from mud has a frame with a plurality of rakes in the lower part, and the frame is circulated in a cycle of forward, ascending, retracting, and descending. By pushing the settling sand forward, the settling sand was fed to a discharge tank connected in front of the settling tank, and the settling sand was scooped up by a bucket elevator disposed in the discharge tank and discharged to the outside.
[0003]
We do not conduct prior art searches at the research and development stage or the application stage, and do not know the prior art documents to be described.
[0004]
[Problems to be solved by the invention]
However, in the rake described above, if a large amount of sand is accumulated in the sand settling tank, the rake cannot push the sand forward, causing a load on the drive of the rake and causing a failure, The work such as taking out was extremely troublesome.
[0005]
[Means for Solving the Problems]
In view of the above-mentioned problems, the present invention provides a sand settling tank having a discharge tank connected to the front, and a column is erected on each of the beam members installed horizontally at a predetermined interval between the upper ends of the left and right side walls of the sand set tank. In addition, an upper rotating shaft is installed between the upper ends of the columns, and a lower rotating shaft that is short and parallel to the upper rotating shaft is provided at each lower portion of the columns, and the upper and lower ends of each column are close to each other on the upper and lower rotating shafts. A pair of sprockets are pivotally attached to the position, and the front part and the rear part of the support rod that is long in the front-rear direction of the sand basin are interposed and connected to the chain suspended for each pair of upper and lower sprockets. The support rod is hung horizontally above the sand settling tank, and the tip of a lift cylinder rod erected on one beam is attached to the middle of one chain, and the rod is supported by expansion and contraction of the rod. Each chain can be moved up and down A spring urged to one of the slack side of the chain is provided on the connecting end side with the support rod, and a proximity sensor for detecting the displacement of the chain is provided on the support rod in the vicinity of the spring. A frame having a rake that pushes sand sink forward is suspended so that it can move only in the front-rear direction with the vertical movement restrained, and at the rear end of the frame is a reach that is disposed at the lower end of the support rod. The tip of the cylinder rod is attached, and the frame can be moved back and forth by expansion and contraction of the rod. The lift cylinder and the reach cylinder are incorporated in a hydraulic unit that constitutes a series of hydraulic circuits. the device connects the proximity sensor, typically, the forward rake with a predetermined stroke by the lift cylinder and reach cylinder actuated by the control device, the upper , Retraction, extruded forward the settling of settling tank by circulating operation in the order of descending, feeding the grit to the discharge vessel.
When the forward movement of the rake by the reach cylinder is suppressed by the sand settling on the bottom of the sand settling tank, the control device supplies a part of the pressure oil supplied to the reach cylinder to the lift cylinder, and the lift cylinder When the rake is moved up to the upper position where the restraint can be released and the rake comes into contact with the sand sink while the rake is moving downward by the lift cylinder, if the chain is displaced to the loose side by the spring, this displacement is detected by the proximity sensor. Detected and input to the control device as an electrical signal, and the control device is set to switch from the downward movement of the rake by the lift cylinder to the forward movement of the rake by the reach cylinder , so that a large amount of sedimentation is accumulated and the rake When it can no longer be pushed forward, it automatically detects that the rake is buried in the sand and becomes inoperable. After that, by repeating the circulation operation to push the sedimentation forward from the upper layer, it automatically shifts to the circulation operation at the position before the forward movement of the rake was suppressed by sedimentation while gradually reducing the sedimentation amount of sedimentation. In this way, the above problem is solved.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
A sand settling tank 1 for sedimenting and classifying sand from mud is formed in a semicircular cross section and is formed long in the front and rear. The sand settling tank 1 introduces a mud loading pipe (not shown), and sand settling from the rear end of the sand settling tank 1. The water level of the settling tank 1 is kept constant so that the upper layer water of the tank 1 is allowed to overflow and discharged to the outside.
Further, in front of the sand settling tank 1, a discharge tank 3 in which water wheel-like bucket elevators 2 each having a bucket 2a are provided in a radial manner is connected. In FIG. Are set on the same plane, but the bottom of the discharge tank 3 may be set lower than the bottom of the sand settling tank 1.
[0007]
Between the upper ends of the left and right side walls of the sand settling tank 1, a pair of beam members 4 and 4a are installed horizontally at a predetermined interval in the front and rear, and a substantially gate-shaped support column 5 and 5a is provided between the beam members 4 and 4a. Standing up.
An upper rotating shaft 6 is installed between the upper ends of the columns 5 and 5a, and a lower rotating shaft 6a that is parallel to the upper rotating shaft 6 and is provided at the lower part of the beam members 4 and 4a at the lower ends of the columns 5 and 5a. In the upper and lower rotating shafts 6 and 6a , a pair of upper and lower sprockets 7 and 7a are respectively pivotally attached to positions close to the upper and lower ends of each support column 5 and 5a, and each pair of upper and lower sprockets 7 and 7a is suspended. The front and rear portions of the support rod 9 that is long in the front-rear direction of the sand settling tank 1 are connected to the chains 8 and 8a (passed with some play), and the support rod 9 is attached to each column 5 , 5a, and is suspended horizontally above the sand settling tank 1 through the vertically long gaps 10 and 10a.
The lowest limit position of the support rod 9 is set such that the length of the chains 8 and 8a is set above the beam members 4 and 4a, and the water level of the sand settling tank 1 is set below the lower sprocket 7a. Yes.
A chain connecting member 11 is connected to the middle part of the chain 8a that spans the rear sprockets 7 and 7a, and an intermediate part of the connecting member 11 is a lift cylinder installed on the rear beam member 4a. The tips of 12 rods 12a are pivotally attached.
The sprockets 7 and 7a, the chains 8 and 8a, the lift cylinder 12 and the like serve as the vertical movement means of the support rod 9, and the rod 12a of the lift cylinder 12 expands and contracts so that the support rod 9 can be moved up and down. is doing.
In addition, the connecting end side of the chains 8 and 8a connected to the upper end of the support rod 9 has both sides of the slack side of the chains 8 and 8a (the left and right sides of the sand settling tank 1) so as to hold the chains 8 and 8a in a straight line. Between the strip 13 and the support rod 9 so that it is biased diagonally toward one of the slack sides of the chains 8 and 8a. ) A spring 14 is interposed, and a proximity sensor 15 for detecting the displacement of the chains 8 and 8a is provided on the support rod 9 in the vicinity of the spring 14.
[0008]
On the support rod 9, a rectangular frame 16 that is long in the front-rear direction is fixed in front of the support columns 5 and 5a, and the upper and lower horizontal portions of the rectangular frame 16 are formed as tracks 17 and 17a. The upright portions at the ends are formed as car stops 18 and 18a, and the traveling wheels 19 and 19a are mounted in the rectangular frame 16 so as to be movable only in the front-rear direction , and the rectangular frame 16 is caused by vibration caused by the vertical movement of the support rod 9 or the like. running wheels 19,19a without departing, and has as it move back and forth in a state where vertical movement in orbit 17, 17 a is inhibited from.
A frame 22 in which vertically long brackets 20 and 20a are suspended at the axle ends of the traveling wheels 19 and 19a, and rakes 21, 21a,. Is drooping.
[0009]
The frame 22 is formed by assembling square bars 22b, 22c, etc. in a substantially triangular shape with a horizontal bar 22a installed on the front and rear brackets 20, 20a as upper ends, and the rakes 21, 21a, etc. are substantially curved in the curved shape at the bottom of the sand settling tank 1. A plurality of rakes 21, 21 a... Are arranged in a forward descending manner with a predetermined interval in the front-rear direction below the frame 22.
The horizontal bar 22a at the upper end of the frame 22 is set so that its front is inserted into the gap 10 of the front column 5 and is slightly above the beam members 4 and 4a at the lowest position of the support bar 9.
Then, the reach cylinder 23 is attached to the rear end of the support rod 9, and the tip of the rod 23a is attached to the rear end of the horizontal rod 22a of the frame 22, and the tracks 17, 17a, the traveling wheels 19, 19a, the reach cylinder 23, etc. The frame 22 (the rakes 21, 21 a...) Can be moved back and forth by the forward movement means of the frame 22 and the rod 23 a of the reach cylinder 23 extending and contracting.
Further, in the contracted state of the rod 23a of the reach cylinder 23, there are stoppers 24 that come into contact with the columns 5, 5a on the front and rear sides of the support rod 9 corresponding to the front of the front column 5 and the rear of the rear column 5a, respectively. 24a is provided.
[0010]
The lift cylinder 12 and the reach cylinder 23 are hydraulic cylinders, which are incorporated in a hydraulic unit that constitutes a series of hydraulic circuits, and a control device (not shown) of the hydraulic unit and the proximity sensor 15 connected to the control device. It is controlled by the control means consisting of.
Then, the lift cylinder 12 and the reach cylinder 23 operated by the control device circulate the rakes 21, 21 a... With a predetermined stroke in a cycle of forward, ascending, backward, and descending, that is, the rakes 21, 21 a. The operation of pushing the sand settling on the inner bottom of the sand settling tank 1 forward and returning to the original position is repeated.
Normally, the rakes 21, 21 a... Are at the same place (hereinafter referred to as a normal operation position), that is, as shown in FIG. 1, the rakes 21, 21 a. In addition, from the initial position of the rakes 21, 21 a... In which the rod 23 a of the reach cylinder 23 contracts, the advance and retreat substantially correspond to the length of the tracks 17, 17 a by the reach cylinder 23, and the maximum contraction of the rod 12 a of the lift cylinder 12. The raising / lowering with respect to the set height position which does not reach is repeated by the said cycle.
Further, when the forward movement of the rakes 21, 21 a... Is suppressed by the sand settling on the inner bottom of the sand settling tank 1, the control means moves the lift cylinder 12 and the forward / backward moving means so as to operate according to the following procedure. Reach cylinder 23 is controlled.
That is, when the forward movement of the rakes 21, 21 a... By the reach cylinder 23 is suppressed by the sand settling on the bottom of the sand settling tank 1, a part of the pressure oil supplied to the reach cylinder 23 is supplied to the lift cylinder 12. The support rod 9 is moved up to a position where the above-described suppression can be released by the lift cylinder 12 (the reach cylinder 23 is the upper layer of the settling sand where the frame 22 (rakes 21, 21 a...) Can be moved forward).
The rakes 21, 21 a... That have moved forward halfway through the release of the above-described restraint push the upper layer of sand sinks forward, and then perform the same circulating operation by the reach cylinder 23 and the lift cylinder 12. It will be.
During the downward movement of the rakes 21, 21a, etc. by the lift cylinder 12, the rakes 21, 21a,... Are placed on the sedimentation sand that has not yet been sent forward (equivalent to the uppermost position of the rakes 21, 21a, etc.). Since the lift cylinder 12 still operates to extend the chains 8 and 8a downward even if they come into contact with each other, the chains 8 and 8a suspended between the sprockets 7 and 7a try to relax, but the springs 14 are attached. Due to the force, it is displaced in a tensioned state toward the proximity sensor 15 side without being relaxed (see FIG. 6).
The proximity sensor 15 detects the displacement state of the chains 8 and 8a, and when this is input to the control device as an electric signal, the control device detects the downward movement of the support rod 9 by the lift cylinder 12 and the frame by the reach cylinder 23. Switch to 22 forward movement.
Accordingly, the rakes 21, 21a,... Push the upper layer of the sand sink forward.
In this way, the above-described operation of the rakes 21, 21a,... By the lift cylinder 12 and the reach cylinder 23 controlled by the control means is repeated, so that the rakes 21, 21a. Operate.
[0011]
Next, the operation of the sand settling device will be described.
First, the slurry supplied to the sand settling tank 1 is set in the lift cylinder 12 and the reach cylinder 23 by the control device when the sand having a large specific gravity settles in the discharge tank 3 and the sand settling tank 1 and the sand settling begins. The rakes 21, 21 a... Are repeatedly moved forward, lifted, retracted, and lowered at the normal operating position, and the sand is sent to the front discharge tank 3.
The settling sand settling in the discharge tank 3 and the settling sand sent by the rakes 21, 21 a... Are scooped up by the bucket 2 a of the rotating bucket elevator 2, washed with water, dropped on the discharge conveyor, and discharged to the outside.
Further, when the rakes 21, 21a, etc. are prevented from moving forward due to sedimentation, such as the rakes 21, 21a, etc. cannot push the sands forward, the rakes 21, 21a ... Is lifted by the lift cylinder 12 to an upper position where the restraint is released, and at this position, the rakes 21, 21a... Are advanced by pushing the upper layer of the sand sink forward by the reach cylinder 23, and then the lift cylinder 12 When the rakes 21, 21 a, etc. are in contact with the sand settling down, the chains 8, 8 a are displaced toward the relaxation side by the springs 14, and the proximity sensor 15 detects this displacement and inputs it as an electrical signal to the control device. the control device switching operates from below the operation of the rake 21, 21a ... by the lift cylinder 12 to the rake 21, 21 a ... forward movement of by reach cylinder 23, thereby the upper layer of sand is Leh 21, 21 a ... is pushed forward by.
Such an operation is repeated until the chains 8, 8a are not displaced when the rakes 21, 21a are lowered, that is, until the sedimentation amount is reduced and the rakes 21, 21a can be lowered to the lowest position. Is called.
When the rakes 21, 21 a, etc. are positioned on the sand sink as described above, the chains 8, 8 a are regulated by the sprockets 7, 7 a even if there is a large undulation difference before and after the sand sink, The rakes 21, 21a (supporting rod 9) always maintain a horizontal state and do not tilt in the front-rear direction.
Further, when the chain 8, 8a is displaced, the spring 14 tensions the chain 8, 8a by its urging force. Therefore, even if the chain 8, 8a is suspended on the sprocket 7, 7a, the chain 8, 8a It cannot be removed from the sprockets 7 and 7a.
[0012]
【The invention's effect】
In short, in the present invention, in the sand settling tank 1 in which the discharge tank 3 is connected to the front, the beam members 4 and 4a , which are horizontally installed with a predetermined interval between the upper ends of the left and right side walls of the sand settling tank 1 , are provided with the support columns 5 respectively. , provided upright 5a, as well as bridged the upper rotating shaft 6, the struts 5, 5a bottom of each to the upper rotational shaft 6 parallel short downward rotation axis 6a to the provided between the upper end of the struts 5, 5a In the upper and lower rotary shafts 6 and 6a , a pair of upper and lower sprockets 7 and 7a are respectively pivotally attached to positions close to the upper and lower ends of the support columns 5 and 5a , and are suspended for each pair of upper and lower sprockets 7 and 7a . By connecting the front and rear portions of a support rod 9 that is long in the front-rear direction of the sand settling tank 1 to the chains 8 and 8a , the support rod 9 is horizontally suspended above the sand settling tank 1 and one chain the middle portion of 8a, the rod 12 a of the preceding lift cylinder 12 erected on one of the beam members 4a The attached, together form a vertically movable supporting rod 9 at the expansion and contraction of the rod 12 a, the connection end of the supporting rod 9 of each chain 8, 8a, one of the chain 8, 8a slack side of the the spring 14 biases provided, the proximity sensor 15 for detecting the displacement of the chain 8, 8a provided on the support rod 9 in the vicinity of the spring 14, the support rod 9, the rake 21 pushes the grit forward, the frame 22 arranged to 21 a ... on the lower as well as movably suspended only in the longitudinal direction in a state in which vertical movement is inhibited, reach cylinders at the rear end of the frame 22, and disposed on the support rod 9 lower rear end attach the end of the rod 23 a 23, form a frame 22 and freely move back and forth in the expansion and contraction of the rod 23 a, the lift cylinder 12 and reach the cylinder 23, incorporated in the hydraulic unit constitute a set of hydraulic circuit The control unit for the hydraulic unit includes The contact sensor 15 is connected, typically, the forward rake 21, 21 a ... a with a predetermined stroke by the lift cylinder 12 and reach the cylinder 23 actuated by the control device, elevated, retracted, by circulating operation in the order of descending During the forward movement, the sand settling in the inner bottom of the sand settling tank 1 can be sent to the front discharge tank 3.
Further, when the rakes 21 , 21 a... Are positioned on the sand sink, even if there is a large undulation difference before and after the sand sink, the chains 8, 8 a are regulated by the sprockets 7, 7 a so that the rake 21 , 21 a. 21 a... Can always maintain a horizontal state without tilting in the front-rear direction, and the rakes 21 , 21 a.
[0013]
Then, the lift when the rake 21 according to reach the cylinder 23, 21 a ... forward movement of is suppressed by sand deposited on grit tank 1 in the bottom, a part of the pressure oil is the control device to be supplied to reach the cylinder 23 supplied to the cylinder 12, the lift cylinder 12 at is moved upward rake 21, 21 a ... to releasable upper position above suppression, then lift the rake 21 by the cylinder 12, 21 a ... rake during downward movement of the 21 , when the 21 a ... is in contact with the sand, the chain 8, 8a is displaced to the slack side by the spring 14, and input to the control device as an electric signal the displacement proximity sensor 15 detects, the control device lift cylinder Having set such switching from the rake 21, 21 a ... of the lower operation to rake 21, 21 a ... forward operation by reach cylinder 23 by 12, rake by increasing the deposition amount of sand 21 21 when a ... is not pushed out of the settling forward the rake 21, 21 a ... is automatically increased to operable position, then, depending on the deposition amount of sand, pushes the upper gradually forward By repeating the circulation operation, it is possible to automatically shift to the normal operation position before the forward movement of the rakes 21 , 21 a.
Therefore, according to the present invention, the operation of the rakes 21 , 21 a... Can be controlled in accordance with the amount of sedimentation, and the drive system can not avoid the state where the rake is buried due to a large amount of sedimentation, as in the prior art. However, there is no practical problem such as the fact that the sand removal work for restarting the rake is unnecessary.
[Brief description of the drawings]
FIG. 1 is a side view showing a sand settling device.
FIG. 2 is an enlarged view of a main part of FIG.
3 is a cross-sectional view taken along the line AA in FIG.
4 is an enlarged view of a main part of FIG. 3;
5 is an enlarged cross-sectional view taken along the line BB in FIG. 1. FIG.
6A is a diagram showing a chain tension state when the support rod is located at the lowest limit, and FIG. 6B is a diagram showing a state when the chain is displaced.
[Explanation of symbols]
1 Sand settling tank 3 Discharge tank
4, 4a beam material
5, 5a prop
6 Upper rotation axis
6a Downward rotating shaft 7, 7a Sprocket 8, 8a Chain 9 Support rod
12 lift cylinder
12 a Rod
14 Spring
15 proximity sensor
21, 21a ... Rake
22 frames
23 reach cylinder
23 a Rod

Claims (1)

In a sand settling tank with a discharge tank connected to the front, a column is erected on each of the beam members installed horizontally with a predetermined interval between the upper ends of the left and right side walls of the sand settling tank , and the upper side between the upper ends of the columns A rotating shaft is installed, and a lower rotating shaft that is parallel to the upper rotating shaft is provided at each of the lower portions of the support columns, and a pair of sprockets are provided in the upper and lower rotating shafts in the proximity of the upper and lower ends of each supporting column. Each support shaft is attached to the upper and lower pair of sprockets and connected to the chain, which is long in the front-rear direction of the sand settling tank, by connecting the front and rear portions of the support bowl to the top of the sand settling tank. At the middle of one chain, attach the tip of a lift cylinder rod that is erected on one beam, and the support rod can be moved up and down by stretching the rod. On the side of the connecting end with the chain support rod A spring urged on one side of the chain is provided, and a proximity sensor that detects the displacement of the chain is provided on a support rod in the vicinity of the spring. The frame is suspended so as to be movable only in the front-rear direction with the vertical movement restrained, and the tip of a reach cylinder rod disposed at the rear end of the lower part of the support rod is attached to the rear end of the frame. The lift cylinder and the reach cylinder are incorporated in a hydraulic unit that constitutes a series of hydraulic circuits, and the proximity sensor is connected to the control unit of the hydraulic unit, The control device uses a lift cylinder and a reach cylinder to circulate the rake with a predetermined stroke in the order of forward, ascending, retracting, and descending. When the forward movement of the rake due to-is suppressed by the sand settling on the bottom of the sand settling tank, a part of the pressure oil supplied to the reach cylinder is supplied to the lift cylinder, and the above restriction can be released by the lift cylinder The rake is moved up to the position, and when the rake comes into contact with the sand settling while the rake is moving downward by the lift cylinder, the proximity sensor detects this displacement as an electrical signal when the chain is displaced to the loose side by the spring. A sand settling device characterized in that the control device is set to switch from the downward movement of the rake by the lift cylinder to the forward movement of the rake by the reach cylinder .

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