JP2007029855A - Solid-liquid separation apparatus for slurry-like material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus in which secure solid-liquid separation is carried out even if a solid component is fine and has a hardly entwined shape such as honing sludge, complicated maintenance such as filter replacement is not required, and most suitable pressurizing is carried out without causing a breach of the filter. <P>SOLUTION: The apparatus includes a mold 1 forming an internal diameter face into a cylindrical face shape, a gate 2 switchably closing the one end opening of this mold 1, and a pressure rod 3 slidably fitted in the mold 1 and pressing a slurry material S in the mold 1 to the gate 2 side to compress it. A pressure device 14 which moves this pressure rod 3 forward and backward, and its pressure control device 33 are provided. The tip end face of the pressure rod 3 and the internal face of the gate 2 have the arrangement of fibrous and paper filters 4 and 5 to compress them. The pressure control device 33 controls pressure such that the pressure applied to the slurry material in the mold becomes less than a predetermined pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  This invention is a solid component from a slurry-like body mixed with a machining fluid and powdered processing waste produced by honing, super processing, lapping, grinding, etc., or from a slurry-like body produced by wood processing etc. It is related with the solid-liquid separation apparatus of the slurry-like body which isolate | separates a liquid component and solidifies about a solid component if possible.

In grinding and polishing, powdery processing waste such as grinding waste is generated. This powdery processing waste is discharged out of the machine in a slurry-like body mixed with a processing fluid such as coolant, that is, in a sludge state. The discharged sludge is separated into solid and liquid by filtration, low pressure filter press, etc., and the processing liquid is recovered and reused.
In solid-liquid separation methods such as filtration and low-pressure filter pressless, the liquid content is high even after separation, and not only the processing liquid cannot be recovered sufficiently, but also the concentrated sludge concentrated by solid-liquid separation is recycled. In the past, landfill processing was performed as industrial waste.

In order to solve such a problem, as shown in FIG. 10, the grinding sludge is filled with a concentrated sludge S ′ into a cylindrical mold 51 and squeezed with a pressure rod 53 to form a briquette shape. Various types of solidifying materials have been proposed (for example, Patent Document 1) and have already been put into practical use. The other end of the mold 51 is closed by a gate 52, and the solidified material is pushed out by a pressure rod 53 by opening the gate 52.
JP 2001-300597 A

  The grinding sludge solidifying device using the cylindrical mold 51 and the pressure rod 53 can be used for grinding sludge that is relatively coarse and easily entangled with processing waste, but the following sludge is used. Can not be used. For example, it cannot be used for honing sludge, super sludge, lapping sludge, and bearing grinding sludge (roller, steel ball).

  This is because the processing waste flows out together with the liquid components from the mechanical gaps δ1, δ2 of the processing portion such as between the mold 51 and the pressure rod 53 and the gate 52 because the processing waste is fine or round and difficult to entangle. It is because it ends. That is, general grinding scraps are relatively large and in the form of yarn scraps, so that they are easily entangled and solidified easily, and flow out of the mechanical gaps δ1, δ2 of the processed parts. hard. However, in the honing sludge, the processing waste is round and does not get entangled, and in the super processing or lapping processing sludge, the processing waste is very fine. The processing grinding sludge of bearing rolling elements is also fine. Therefore, the above-described solidifying device for grinding sludge cannot be used.

  The outflow of the processing waste from the mechanical gaps δ1, δ2 of the processing part not only makes solidification difficult, but also prevents the processing fluid from being reused because the processing waste is mixed with the recovered liquid component. The process which filters the collect | recovered processing liquid again is required.

  In addition, when using a grinding sludge solidification device for honing sludge solidification, etc., it is also possible to fix a metal filter or the like to prevent the machining waste from flowing out from the mechanical gap of the processed part. Has been tried. However, since stable filtration cannot be performed due to clogging, it is necessary to periodically replace the filter, and maintenance work is troublesome.

  As other sludge treatment methods such as honing processing, there are methods using a low pressure filter press that allows the filter to pass by air pressure in a sealed chamber using a belt-like filter, a precipitation device, and the like. However, none of them can sufficiently reduce the liquid content of sludge, and the precipitation device can reduce the liquid content only to about 50 to 80%. Therefore, the recovery efficiency of the working fluid is poor and it is difficult to recycle the remaining concentrated sludge.

Therefore, the present inventor has devised a method for performing stable solid-liquid separation by using a new paper-like filter for each pressing. However, a paper-like filter may be broken when a rapid pressure is applied during squeezing, and there is a problem in that productivity is low if pressure is applied slowly so as not to break.
For example, since a conventional grinding sludge solidifying apparatus is a hydraulic system, the speed of a hydraulic cylinder that is a driving source of a pressure rod is generally controlled by a flow control valve. In such a hydraulic system, it is difficult to perform optimal control in accordance with the progress of the solid-liquid separation process. In particular, when a filter is used, breakage of the filter cannot be reliably prevented by speed control.

  The object of the present invention is to ensure solid-liquid separation without flowing out from the gaps in the processed part even if the solid component is fine or has a shape that is difficult to be entangled, and complicated maintenance such as filter replacement It is an object to provide a solid-liquid separation device for a slurry-like body that can perform optimum pressurization without causing breakage of the filter during pressurization.

The solid-liquid separator for a slurry-like body according to the present invention is an apparatus for separating a slurry-like body into a solid component and a liquid component, and a mold in which the inner surface is formed into a cylindrical surface and the slurry-like body is charged And a gate that closes one end opening of the mold so as to be openable and closable, and a pressure rod that is slidably fitted into the mold and presses the slurry-like body in the mold against the gate. A pressure device for advancing and retracting the pressure rod, and a pressure control device for controlling the pressure device,
Close the gap between the outer periphery of the tip of the pressure rod and the inner diameter surface of the mold and the gap between the peripheral edge of the mold closing surface of the gate and the inner diameter surface of the mold on the tip surface of the pressure rod and the inner surface of the gate. In a state where a fibrous filter for solid-liquid separation is arranged, the slurry-like body in the mold is squeezed by the pressure rod, and the solid component remaining in the mold by this squeezing is put together with the filter together with the process. Extrude with a pressure rod,
The pressurization control device controls the pressure so that the pressure acting on the slurry-like body in the mold is within a predetermined pressure.
In addition, the slurry-like body said by this specification says the thing with which fine solid and the liquid were mixed, and is the meaning containing sludge.

According to this structure, in order to squeeze the slurry-like body in the mold with the filters arranged on the pressure rod side and the gate side, the solid component in the slurry-like body is fine or has a shape that is difficult to get entangled. Even if it is a thing, it is blocked | prevented by the said filter that a solid component flows out from the clearance gap between a metal mold | die, a pressure rod, and a gate. Moreover, since the cylindrical mold and the pressure rod are used, the slurry-like body filled in the mold can be squeezed with a strong pressure.
In this squeezing process, a fibrous filter is used, but the pressure control device controls the pressure so that the pressure acting on the slurry-like body in the mold is within a predetermined pressure, so the filter is broken. Appropriate pressurization can be performed while preventing this. Therefore, the liquid component can be highly squeezed out from the slurry-like body. For example, the compressed body after the solid-liquid separation can have a liquid component of 10 wt% or less. In this way, since solid-liquid separation can be performed to a high degree, handling for reuse of the compressed body after separation is easy, the recovery rate of liquid components can be increased, and resources can be used economically. The load on the natural environment can also be reduced. The filter may be a paper filter. A paper filter is easy to handle. In the case of a paper-like filter, since the problem of tearing is likely to occur, the effect of preventing tearing by the pressure control of the present invention is even more effective.

The filter is pushed out with the pressure rod together with the compressed body remaining in the mold by pressing, and a new filter is used every time, so that stable filtration is possible, and the filter is fixed when the filter is fixed to the machine side. Periodic replacement for clogging is eliminated. Therefore, maintenance work is saved and the working environment is improved. Further, since the filter is discharged together with the compressed body every time the pressing process is performed, it is only necessary to put in the mold, and complicated work such as mounting work is not required, and loading into the mold is easy. Yes.
The filter is in a state of adhering to the compressed body, but by appropriately selecting the material of the filter, there is no problem such as mixing of different components in the reuse of solid components, and the compressed body can be used, for example, as a steelmaking raw material with the filter attached. Etc. can be reused. In addition, a new filter is required for each squeezing, but it becomes possible to reuse the solid component of the slurry-like body that could not be used in the past, the recovery rate of the liquid component is improved, and it has been recovered Considering the fact that the processing fluid does not need to be filtered, the consumption of the filter is not a problem in terms of environment and cost.

The pressurizing device includes a servo motor and a rotation / straight-ahead conversion mechanism that converts the rotation of the servo motor into an advance / retreat operation of the pressurizing rod, and the pressurization control device uses a torque as the pressure control. Torque control may be performed so as to be within a predetermined value.
By using a servo motor, control is easier than in the case of pressurization by hydraulic pressure, and optimal solid-liquid separation can be performed by torque control or the like. In the case of torque control, a detector capable of detecting the load torque of the servo motor may be used as a detector for performing feedback control, and the detector is simpler than that provided with a detector that directly detects pressure. Just do it. In addition, maintenance work such as exchanging hydraulic hydraulic oil or a hydraulic filter is not necessary. Furthermore, energy saving can be achieved with the pump system, and the working environment is improved with low noise.

More specifically, the pressurization control device includes a rapid pre-progression process in which the tip of the pressure rod is brought close to the slurry-like body in the mold, a pre-pressurization process in which solid-liquid separation is performed by pressing, and a pressurization rod. The pressurizing device is controlled so as to go through a pressurizing and holding process for holding the pressing force and a rapid retreating process for retreating the pressurizing rod from the compressed body of the slurry-like body in the mold. Then, the torque control is performed so that the load torque does not exceed the set value, and the speed control is performed so as not to exceed the set speed, and the torque control is performed so that the set load torque is held for the set time in the pressurizing and holding process. It is good also as what performs.
By detecting a sudden increase in the load torque in the pre-rapid progress, a rapid forward movement can be performed according to the amount of the charged slurry, and the dead time is reduced. In the advancement process before pressurization, the pressure can be controlled so that the filter does not break by torque control, and by applying speed control, the filter can be squeezed at the optimum pressure and forward speed within the range where the filter is not broken. In squeezing out the liquid component by pressing, a time delay occurs with respect to the pressurization, and the liquid component gradually oozes out, so that the liquid component can be squeezed out more highly by providing a pressurization holding process. The liquid content of the compressed body can be reduced and the liquid recovery efficiency can be improved.

  The solid-liquid separator for a slurry-like body according to the present invention is an apparatus for separating a slurry-like body into a solid component and a liquid component, and a mold in which the inner surface is formed into a cylindrical surface and the slurry-like body is charged And a gate that closes one end opening of the mold so as to be openable and closable, and a pressure rod that is slidably fitted into the mold and presses the slurry-like body in the mold against the gate. A pressure device for advancing and retreating the pressure rod; and a pressure control device for controlling the pressure device; and the outer periphery of the tip of the pressure rod and the mold on the tip surface of the pressure rod and the inner surface of the gate. A slurry-like body in the mold in a state in which a fibrous filter for solid-liquid separation that closes the gap between the inner diameter surfaces of the gate and the periphery of the gate closing surface of the gate and the inner diameter surface of the mold is disposed. Is squeezed with the pressure rod and remains in the mold by this squeezing. The solid component is extruded together with the filter by the pressure rod, and the pressure control device controls the pressure so that the pressure acting on the pressure rod is within a predetermined pressure. Even if the solid component is fine or has a shape that is difficult to get entangled, solid solid-liquid separation can be performed without flowing out from the gap in the processed part, and complicated maintenance such as filter replacement is unnecessary. In addition, optimal pressurization can be performed without causing filter breakage during pressurization, and solid-liquid separation can be performed efficiently and highly.

  An embodiment of the present invention will be described with reference to FIGS. First, with reference to FIG. 1 and FIG. 2, the process of pressing the slurry-like body and the solidified product will be described. The slurry-like solid-liquid separation device includes a mold 1 having a cylindrical inner surface, a gate 2 that closes one end opening of the mold 1 so as to be opened and closed, and a slidable fit in the mold 1. And a pressure rod 3 that presses and squeezes the slurry-like body S put into the mold 1 against the gate 2 side.

  This solid-liquid separation device includes a tip end surface 3a of the pressure rod 3 and an inner surface 2a of the gate 2, a gap d1 between the outer periphery of the tip end of the pressure rod 3 and the inner surface of the mold 1, and the gate 2 and the mold 1. The slurry-like body S in the mold 1 is squeezed by the pressure rod 3 in the state where the fibrous filters 4 and 5 for solid-liquid separation that close the gap d2 between the contact surfaces are arranged, and the squeezing The solid component remaining in the mold 1 is extruded with the pressure rod 3 together with the filters 4 and 5. The mold 1, the gate 2, and the pressure rod 3 are only required to be able to use the filters 4 and 5 as described above. It does not have to be applied. The gap d1 is emphasized in the figure and is, for example, 0.1 mm or less.

  The mold 1 may be either in a standing posture or a lateral posture, but in this embodiment, it is in a standing posture. The gate 2 is configured to open and close the lower end opening of the mold 1 by sliding in the mold diameter direction along the lower end face of the mold 1. The gate 2 may be a plunger type (such as the gate 52 of FIG. 10) that can be inserted into and removed from one end of the mold 1.

  The pressure rod 3 is driven back and forth by a pressure device, which will be described later. The pressure rod 3 can be inserted into and removed from the mold 1 from the upper end of the mold 1 and the compressed body of the slurry-like body S inside the gate 2 is opened. It has an extrudable stroke. The pressurizing device may be one that uses a servo motor as a drive source, or may be one that is controlled by a hydraulic servo system using a hydraulic drive source such as a hydraulic cylinder.

  Examples of the slurry-like body S to be treated include honing sludge, super sludge, lapping sludge, rolling rollers such as bearing rollers and steel balls, and other general grinding sludges. Sludge etc. can be used. In the honing sludge, the particle size of the processing waste is about 1 to 50 μm, and in super processing, it is in submicron units. The steel material to be subjected to each of the above processes may be subjected to a heat treatment such as quenching. In addition to the above, the slurry S to be treated may be food residue such as okara or red bean residue, pulp residue, dewatered sludge, or the like. Further, the slurry-like body S may be one in which the solid component is made of super steel or glass powder.

The upper and lower filters 4 and 5 are paper-like ones such as paper filters or cloth filters. In addition, the filters 4 and 5 may be in the form of cotton or sponge. The material of the filters 4 and 5 may be made of chemical fiber, but is preferably made of plant fiber. The shape of the filters 4 and 5 is, for example, circular, and is larger than the inner diameter of the mold 1 to the extent that rising portions 4 a and 5 a are generated along the inner diameter surface of the mold 1 when loaded in the mold 1. Large diameters are used. The roughness of the filters 4 and 5 is selected according to the slurry S to be processed. When the slurry-like body S is formed by honing of a steel material, a material having an air flow rate V (cm ³ / cm ² s) of about 10 to 300 is selected.

A solid-liquid separation method using the solid-liquid separation device having the above configuration will be described. The lower filter 5 is loaded on the bottom of the mold 1 with the lower end opening of the mold 1 closed by the gate 2 and the pressure rod 3 coming out of the mold 1 upward. Thereafter, the slurry-like body S is introduced into the mold 1 from the upper end opening, and the upper filter 4 is loaded so as to cover the slurry-like body S that has been introduced.
With the slurry S thus charged and the upper and lower filters 4 and 5 loaded, the pressure rod 3 enters the mold 1, and the slurry in the mold 1 is pressed by the pressure rod 3. The body S is squeezed. When the pressing is completed, the gate 2 is opened, the pressing rod 3 is further pushed in, and the pressing body of the slurry-like body S is discharged from the lower end opening.

Liquid components such as oil, water, and other processing liquids squeezed from the slurry-like body S by this squeezing are between the gap d1 between the mold 1 and the pressure rod 3, and between the contact surfaces of the mold 1 and the gate 2. It is discharged from the gap d2. At this time, since the gaps d1 and d2 are closed by the filters 4 and 5, the liquid component squeezed out from the slurry-like body S is not directly discharged from the gaps d1 and d2, and the filter 4 , 5 will be discharged.
For this reason, even if the solid component of the slurry-like body S is fine, such as processing scraps by honing processing, super processing, lapping processing scraps, etc., the solid components are the mold 1 and the pressure rod 3 or the gate. 2 and is supplemented by the filters 4 and 5 without flowing out from the gaps d1 and d2. Therefore, solid-liquid separation is possible even for a slurry-like body that has been difficult to separate with a conventional grinding sludge solidification apparatus. This facilitates solidification of the slurry-like body S by squeezing, and the liquid components such as the honing liquid are discharged in a cleaned state, and the liquid components in a reusable state are recovered without subsequent filtration. it can.

The slurry-like body S in the mold 1 is solidified into a cylindrical briquette-like solidified substance SB (FIG. 2) by pressing. The solidified product SB is obtained by attaching the filters 4 and 5 on both sides to the solidified product main body SBa. Further, since the cylindrical mold 1 and the pressure rod 3 are used, it is possible to perform solid-liquid separation at a high pressure by increasing the pressure. When the slurry-like body S is a honing sludge, the oil content is, for example, about 40 wt% in the sludge generation state, and is put into the mold 1 in this state, but the oil content is 10% or less by the above-described pressing. .
By solidifying into the solidified product SB as described above, handling such as transportation and storage becomes easy, and recycling becomes possible. When the solid component is a slurry S of steel material, the obtained solidified product SB is used as a steelmaking raw material and charged into a furnace. In addition, since solid-liquid separation can be performed to such an extent that the oil content becomes 10% or less, for example, the processing liquid that is a liquid component can be recovered with high efficiency. Thereby, resources can be used economically and the load on the natural environment can be reduced.

  In addition, in the case of the slurry-like body S that is difficult to solidify, it is not always necessary to solidify. Even if it is not solidified, it can be used as a raw material for steelmaking because the liquid content is reduced by pressing. In addition, even if it is not solidified, solid-liquid separation can be performed at a high level, the processing oil recovery efficiency can be improved, and the purified processing oil can be recovered. But it will be economical.

  The above-mentioned filters 4 and 5 are extruded with the pressure rod 3 together with the solidified product SB remaining in the mold 1 or the unsolidified compressed body by pressing, and a new filter 4 or 5 is used for each pressing. The filter clogging problem does not occur, and the maintenance work for filter replacement can be saved. Since the filters 4 and 5 are discharged together with the compressed body for each pressing process, it is only necessary to put them in the mold 1, and no complicated work such as mounting work is required. Easy to do.

The filters 4 and 5 are attached to the solidified product SB. However, by selecting the materials of the filters 4 and 5 as appropriate, there is no problem such as mixing of different components, and the filters 4 and 5 remain attached. The chemical substance SB can be reused as, for example, a steelmaking raw material. If the filters 4 and 5 are made of plant fiber, they will burn when placed in the furnace, so they do not affect the material of the steel material, and the gas and debris generated when burned may cause pollution. Absent. Since the filters 4 and 5 adhere to the solidified product SB, it is not necessary to discard the used filters 4 and 5 separately, which also improves workability.
The filters 4 and 5 need to be new for each squeezing, but it is possible to reuse the solid component of the slurry-like material that could not be used in the past, and the recovery rate of the liquid component can be improved. Considering the fact that filtration 4 of the collected machining fluid is unnecessary, the consumption of the filter is not a problem from the environmental and cost viewpoints.

  3 to 8 show specific configuration examples of the solid-liquid separation device. The solid-liquid separation device includes a mold positioning device 11 that can move the mold 1 along a predetermined path and can be positioned at a plurality of index positions P1 to P3, and one index position by the mold positioning device 11. A filter loading device 12 provided at P2, a slurry-like body supply device 13 provided at another index position P1, and a pressurizing device 14 provided at another index position P3 are provided.

  The mold positioning device 11 includes a guide rail 16 that guides the traverse unit 30 on which the mold 1 and the gate 2 are mounted along a straight path, and an advance / retreat apparatus 17. The traverse unit 30 is obtained by mounting the mold 1, the gate 2, and the chute 31 on the traverse base 15. The guide rail 16 is a bar-like member provided on the fixed base 41 in parallel two vertically, and a guided portion 18 (FIG. 7) provided on the traverse base 15 is slidably fitted. The advancing / retracting device 17 includes a feed screw mechanism 19 such as a ball screw provided in parallel with the guide rail 16 and a motor 20 such as an AC servo motor that rotates a screw shaft 19 a of the feed screw mechanism 19. The screw shaft 19 a of the feed screw mechanism 19 is rotatably installed on the fixed base 41, and the ball nut 19 b (FIG. 7) is fixed to the traverse base 15.

  In FIG. 3, among the index positions P1 to P3, the index position P2 is a filter loading position. The index position P2 is distributed to both sides of the traverse base advancing and retracting direction, and the index position P1 for supplying the slurry-like body An indexing position P3 for squeezing by the pressure device 14 is arranged.

  The filter loading device 12 lifts and lowers an elevating rod 22 having a suction pad 21 made of a vacuum chuck at the lower end by an elevating device 23 such as an air cylinder, and loads the lower filter 5 into the mold 1. The upper filter 4 is loaded into the mold 1. The lower filter 5 may be loaded by placing the upper surface of the mold 1 in a flat state and then pressing the filter 1 into the mold 1 with the pressure rod 3 later. The elevating device 23 is provided so as to be able to reciprocate between the index position P2 and a filter supply table (not shown) in the vicinity thereof, and adsorbs the prepared filter on the filter supply table. Loading into the mold 1 is performed.

  The slurry-like body supply device 13 includes a hopper that stores the slurry-like body S and supplies the slurry-like body S to the mold 1 in a fixed amount. The slurry-like body supply device 13 may be a pipe or the like.

  The pressurizing device 14 is a mechanism for moving the pressurizing rod 3 up and down, and an elevating body 25 provided so that the pressurizing rod 3 extends downward is installed on a support base 26 so as to be movable up and down, and the pressurizing rod 3 is moved up and down. The body 25 is moved up and down by a servo motor 28 and a rotation / straight-line conversion mechanism 27. The servo motor 28 is composed of an AC servo motor, and is transmitted to the rotation / linear advance conversion mechanism 27 via the speed reducer 29. The rotation / straight-ahead conversion mechanism 27 includes a feed screw mechanism such as a ball screw, and includes a nut 27b fixed to the elevating body 25 and a screw shaft 27a that is rotatably installed on the elevating body 25. The servo motor 28 is controlled by the pressurization control device 33.

  The traverse unit 30 will be described. The chute 31 for discharging the solidified material SB from the lower end opening of the mold 1 and the gate 2 are installed on a common index base 36, and the index base 36 is connected to the traverse table 15 via a guide member 37 (see FIG. 7). It is supported so that it can move in the traverse table movement direction. The guide member 37 is not shown in other figures of FIG. The guide member 37 can support the index base 36 so that the gate 2 can receive the applied pressure when the slurry-like body S in the mold 1 is pressurized. The index base 36 is moved with respect to the traverse base 15 so that the gate 2 and the chute 31 can be interchanged with each other so that the index base 36 can be aligned with the mold 1, and the position is maintained at the position where the gate 2 or chute 31 is aligned with the mold 1. Further, a moderation mechanism (not shown) such as a ball plunger is provided in the guide member 37 so that the position holding can be released by a forcing force.

Stoppers 38 and 39 for abutting the index base 36 on the traverse table 15 are provided on the fixed base 41 at both ends in the movement path of the traverse table 15. The stoppers 38 and 39 are for performing the following operations. That is, when the index base 36 hits the stopper 38 on the left side of the drawing due to the movement of the traverse base 15 by the mold positioning device 11, the index base 36 stops, but the traverse base 15 can continue to move. By this movement, the positions of the gate 2 and the chute 31 with respect to the mold 1 on the traverse table 15 are switched. Thereby, the gate 2 is opened as shown in FIG. 6B, and the mold 1 and the chute 31 are aligned.
From this state, when the traverse base 15 is moved to the right in FIG. 3 and the index base 36 is pressed against the stopper 39 at the right end, the index base 36 moves relative to the traverse base 15 in the opposite direction, and the gate 2 And the chute 31 are switched to the original state, and the gate 2 closes the mold 1 again.

The operation of the solid-liquid separator having this configuration will be described. First, as shown in FIG. 4, the traverse unit 30 is positioned at the index position P <b> 2, and the lower filter 5 is loaded into the mold 1 by the filter loading device 12. The gate 2 is at a position where the lower end opening of the mold 1 is closed.
Thereafter, the traverse unit 30 is moved to the index position P1 (FIG. 5), and a predetermined amount of the slurry-like body S is put into the mold 1 from the slurry-like body supply device 13.
The traverse unit 30 is positioned again at the index position P2, and the upper filter 4 is loaded into the mold 1 by the filter loading device 12.

  The traverse unit 30 in which the filters 4 and 5 are loaded and the slurry S is loaded is moved to the index position P3 (FIG. 3), and the pressure rod 3 is moved into the mold 1 by the pressure device 14. The slurry-like body S inside is squeezed. By this pressing, the slurry-like body S is solidified into the solidified product SB as described above with reference to FIG.

Thereafter, the traverse unit 30 is moved to the left side. By continuing the movement of the traverse unit 30 even after the index base 36 of the traverse unit 30 hits the stopper 38, the gate 2 is opened and the chute 31 is aligned with the mold 1 as described above with reference to FIG. Position.
In this state, the traverse unit 30 is returned to the indexing position P3 for squeezing, and the solidified material SB in the mold 1 is pushed downward by the pressurizing rod 3 of the pressurizing device 14 so that the solidified material SB is gold. It falls off the mold 1 and slides on the chute 31 and is discharged.
After this discharge, the traverse unit 30 is moved to the right end of the figure, the index base 36 is pressed against the stopper 39, the positions of the gate 2 and chute 31 are changed so that the gate 2 closes the mold 1, and then the next The traverse unit 30 is moved to the filter loading index position P2 for solid-liquid separation.

  In this way, the traverse unit 30 on which the mold 1 is mounted is provided, and the mold 1 is moved to move to the index positions P1 to P3, so that there is a process of loading the upper and lower filters 4 and 5. The apparatus for performing the processes of loading the upper and lower filters 4, 5, loading the slurry-like body S, pressing the slurry-like body S, and discharging the solidified product SB is simple. In addition, since the mold 1 is moved, the filter loading device 12 can perform a new filter from the supply base (not shown) of the filters 4 and 5 during the pressing operation and the loading of the slurry S. 4, 5 can be adsorbed and prepared, the filter loading, squeezing and discharging can be performed efficiently, and the productivity is excellent.

  Next, pressurization operation control for solid-liquid separation will be described. The pressure control device 33 in FIG. 3 controls the pressure so that the pressure acting on the pressure rod 3 is within a predetermined pressure, and combines the speed control and torque control of the servo motor 28 to achieve the pressure control shown in FIG. , Control is performed as shown in FIG. This pressurizing operation is made up of a pre-rapid advance process S (1), a pre-pressurize process S (2), a pressurization holding process S (3), and a rapid reverse process S (4). Torque control and speed control are performed during the pre-pressurization progress S (2), and torque control is performed during the pressurization holding process S (3). Specifically, the control is performed as follows.

The rapid advance process S (1) is a process in which the tip of the pressure rod 3 is brought close to the slurry-like body S in the mold 1 and is controlled at a constant speed. This speed control does not ask | require a control format.
The pre-pressurization process S (2) is a process of performing solid-liquid separation by pressing, and the pressure acting on the slurry S is within a certain pressure by torque control performed so that the load torque does not exceed the set value. Control the pressure so that In addition to the torque control, the speed is monitored so as not to exceed the set speed. In the pre-pressurization progress S (2), the motor output torque increases as the solid-liquid separation progresses, but the forward movement is stopped when the motor output torque reaches the set load torque.
In the pressurizing and holding step S (3), torque control is performed so that the motor output at the set load torque is held for the set time.
The rapid reverse stroke S (4) is a stroke in which the pressure rod 3 is extracted from the mold 1 and performs control such as constant speed.

  In the torque control described above, a torque detector (not shown) may be provided to perform torque feedback control. Instead of directly detecting the torque value, the load current flowing through the servo motor 28 is detected. However, the torque control may be achieved as an open loop by current feedback.

Since the conventional grinding sludge solidifying apparatus is a hydraulic system, the speed of a hydraulic cylinder that is a driving source of the pressure rod is generally controlled by a flow control valve. For this reason, it is difficult for the hydraulic system to perform optimal control in accordance with the progress of the solid-liquid separation process.
In this embodiment, the drive system using the rotation / linear conversion mechanism 27 including the servo motor 28 and the ball screw is easy to control, and the solid-liquid separation process is optimally controlled by performing the control shown in FIG. 8 as follows. Therefore, efficient solid-liquid separation is possible.

Regarding the detection of the start of solid-liquid separation, the rapid increase in the load torque in the pre-progression process (1) is detected and changed to the pre-pressurization process (2). The amount of forward movement is reduced, reducing wasted time.
Moreover, optimal solid-liquid separation is realized as follows. That is, immediately after the start of the pre-pressurization process (2), the torque with the servo motor 28 is adjusted so that the filters 4 and 5 are not broken by the internal pressure generated in the slurry S filled in the mold 1. Control and start solid-liquid separation. As the solid-liquid separation proceeds, the output torque of the servo motor 28 is gradually increased to reach the output torque so that the final pressure holding pressure is reached. By these, optimal solid-liquid separation can be performed, and solid-liquid separation can be completed in a short time compared with the hydraulic system of speed control.

Advantages of adopting the servo motor 28 include the following items.
(1) Energy saving: Energy saving effect of about 80% compared to the hydraulic fixed pump system and about 40% compared to the variable pump system.
(2) Easy maintenance: Maintenance work such as exchanging hydraulic fluid and hydraulic system filters is not required.
(3) Low noise: The working environment is improved.
(4) Efficient solid-liquid separation: Optimal solid-liquid separation by servo motor 28 torque control.

It is sectional drawing which shows the principal part of the solid-liquid separation apparatus of the slurry-like body which concerns on one Embodiment of this invention. (A), (B) is sectional drawing and a perspective view of the solidified material of a slurry-like body, respectively. It is a fracture front view showing the whole solid-liquid separation device of the slurry-like object. It is explanatory drawing of the operation state of the solid-liquid separator. It is explanatory drawing of the other operation state of the same solid-liquid separator. (A), (B) is a fracture | rupture front view which shows the operation state at the time of pressing of the traverse unit in the same solid-liquid separator, and discharge | emission, respectively. (A), (B) is a fracture | rupture side view which shows the operation state at the time of pressing and discharge | emission of the traverse unit in the same solid-liquid separator, respectively. It is explanatory drawing of the pressurization operation control in the solid-liquid separator. It is a flowchart of the pressurization operation control. It is sectional drawing of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mold 2 ... Gate 3 ... Pressure rods 4, 5 ... Filter 11 ... Mold positioning device 12 ... Filter loading device 13 ... Slurry body supply device 14 ... Pressurizing device 15 ... Traverse stand 27 ... Rotation / straight advance conversion Mechanism 28 ... Servo motor 30 ... Traverse unit 33 ... Pressure control devices P1 to P4 ... Indexing position S ... Slurry body SB ... Solidified material

Claims (4)

An apparatus for separating a slurry-like body into a solid component and a liquid component, and a mold in which an inner diameter surface is formed into a cylindrical surface and the slurry-like body is charged, and one end opening of the mold are closed so as to be openable and closable. A gate, a pressure rod that slidably fits in the mold, presses the slurry-like body in the mold against the gate side, and a pressure device that advances and retracts the pressure rod; A pressure control device for controlling the pressure device;
Close the gap between the outer periphery of the tip of the pressure rod and the inner diameter surface of the mold and the gap between the peripheral edge of the mold closing surface of the gate and the inner diameter surface of the mold on the tip surface of the pressure rod and the inner surface of the gate. In a state where a fibrous filter for solid-liquid separation is arranged, the slurry-like body in the mold is squeezed by the pressure rod, and the solid component remaining in the mold by this squeezing is put together with the filter together with the process. Extrude with a pressure rod,
The said pressurization control apparatus controls pressure so that the pressure which acts on the said pressurization rod may become less than predetermined pressure, The solid-liquid separation apparatus of the slurry-like body characterized by the above-mentioned.   The solid-liquid separator for a slurry-like body according to claim 1, wherein the filter is a paper-like filter.   3. The pressurizing control device according to claim 1, wherein the pressurizing device includes a servomotor and a rotation / linear advance conversion mechanism that converts the rotation of the servomotor into an advance / retreat operation of the pressurizing rod. Is a solid-liquid separator for a slurry-like body in which torque control is performed so that the torque is within a predetermined value as the pressure control.   The pressurization control device according to any one of claims 1 to 3, wherein the pressurization control device performs a rapid pre-progression step for bringing the tip of the pressurization rod closer to the slurry-like body in the mold and solid-liquid separation by pressing. The pressurizing device is controlled so as to go through a pre-advance process, a pressurizing and holding process for holding the pressure applied by the pressurizing rod, and a rapid retreating process for retracting the pressurizing rod from the compressed body of the slurry-like body in the mold. In the advance process before pressurization, torque control is performed so that the load torque does not exceed the set value, and speed control is performed so that the set speed is not exceeded, and the set load torque is set for the set time in the pressurization holding process. A solid-liquid separation device for a slurry-like body that performs torque control so as to be retained.

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