JP2001300786A - Solidified abrasive sludge manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus capable of efficiently solidifying abrasive sludge even if the abrasive sludge is the one generated in grinding hardened component or the sludge contains oily coolant and manufacturing a less- collapsible firm briquette from such abrasive sludge. SOLUTION: This manufacturing apparatus 5 manufactures the briquette by squeezing to solidify the concentrated sludge obtained by filtering the abrasive sludge. The abrasive sludge contains the oily coolant generated in the abrasion line of the hardened component. This manufacturing apparatus 5 comprises a primary pressing unit 31 to accommodate and preliminarily squeeze the concentrated sludge of a predetermined quantity, and a secondary pressing unit 32 to squeeze and solidify the preliminarily squeezed sludge. The primary pressing unit 31 of a vertical type has a shutter 35 on a lower end thereof, and the secondary pressing unit 32 of a horizontal type receives the preliminarily squeezed sludge from the shutter 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention solidifies grinding sludge generated in a grinding line for hardened parts, for example, iron-based components such as inner and outer rings of rolling bearings and rolling elements, and other steel materials for bearings. The present invention relates to an apparatus for producing a solidified product of grinding sludge.

[0002]

2. Description of the Related Art Iron-based components such as inner and outer races and rolling elements of a rolling bearing are hardened after quenching.
The rolling surface and the like are ground. The powdery grinding waste generated by the grinding is discharged as sludge together with the coolant outside the machine, and after filtration, the coolant is reused for grinding. Grinding sludge remaining after filtration is landfilled as sludge. FIG. 11 is a block diagram showing the flow of the processing. Grinding debris generated by the grinding machine 101 is conveyed through a pipe together with a coolant, filtered by a filtering means 102 such as a filter or a sedimentation facility, and the purified coolant is filtered by a coolant tank 103 for supply to the grinding machine 101. And return via pump. Since the grinding sludge remaining after filtration contains a large amount of coolant, it cannot be reused, and a disposal company of industrial waste performs disposal processing such as landfill. The amount of grinding waste generated by grinding is small compared to cutting, etc., but in mass production lines such as bearings, the amount generated is large, and landfilling of grinding sludge is not only unfavorable from the environmental point of view, but also It is clear that landfills will no longer be possible due to dead ends in the treatment plant.

[0003] For this reason, it has been studied to solidify the grinding sludge by squeezing it, reuse the squeezed coolant, and reuse the solidified material (hereinafter referred to as "briquette") as a steelmaking material. I have. Grinding sludge using an aqueous coolant can be easily solidified, and solidifying machines have already been sold. However, oil-based coolant has a higher viscosity than aqueous coolant, and grinding sludge using oil-based coolant has various problems in solidification.
For example, when squeezing, the oil-based coolant is hardly discharged from the grinding sludge, and cannot be solidified to a required strength simply by increasing the pressure during squeezing. Therefore, solidification of grinding sludge containing oil-based coolant has not yet been put to practical use.

[0004] In a grinding line for polishing and removing surface flaws of a metal strip in the process of manufacturing a rolled steel strip, grinding sludge is filtered, solidified by pressing and collected as briquettes, and is used for steelmaking. It has been proposed to use it again. In the grinding sludge generated by grinding the rolled steel strip, grinding chips in the grinding sludge are relatively soft and easily solidified. In addition, this grinding sludge has a low proportion of coolant, which also facilitates solidification. However, in the case of hardened part grinding sludge, grinding debris is hard and hard to harden. Therefore, it is necessary to squeeze strongly, but in the grinding sludge of oil-based coolant as described above,
Since it is difficult for the coolant to be discharged at the time of squeezing, solidification is further difficult. Also, in the case of grinding sludge for hardened parts,
For example, for grinding 1 to 2 g of steel, several liters of coolant /
Since min is used, the ratio of coolant in the grinding sludge is large, and solidification is difficult because most of the coolant is coolant.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for manufacturing solidified grinding sludge which can efficiently solidify even hardened parts, and can produce a solidified solid which is hard to collapse. is there. Another object of the present invention is to reduce the size of the apparatus, facilitate the transport of sludge, and discharge the squeezed coolant, thereby achieving more efficient solidification.
Still another object of the present invention is to enable solidification of grinding sludge containing oil-based coolant.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided an apparatus for producing a solidified product of a grinding sludge, wherein a concentrated sludge obtained by filtering a coolant-containing grinding sludge generated in a grinding line of a quenched part is solidified by pressing to solidify the solidified material. A primary press unit for containing a predetermined amount of the concentrated sludge and pre-pressing the same, and pressing the pre-pressed sludge by a predetermined pressure to solidify the sludge. And a next press section. According to this configuration, a primary press unit for pre-pressing the grinding sludge concentrated by filtration is provided, and the pre-pressed sludge is further pressed by the secondary press unit to be solidified. Thus, even if the grinding waste is hard, fine and hard to solidify, it can be solidified. That is, the pressing of the grinding sludge
Due to the viscosity of the coolant and the minute gap between the grinding chips in the grinding sludge, it cannot be performed quickly even if the pressure is increased, and it is difficult to sufficiently reduce the amount of coolant. However, by pre-pressing as described above and pressing it again in the secondary press section, appropriate pressing conditions can be set according to the pressing stage, and pressing until the coolant amount is sufficiently reduced. And squeezing can be performed efficiently. Further, the primary press section and the secondary press section can be operated in parallel, and the pressing can be performed more efficiently. Therefore, even if it is grinding sludge of a hardened part which is difficult to solidify, solidification can be efficiently performed, and a solid solidified material which is hard to collapse can be produced.

In the present invention, the primary press section comprises:
It may be a vertical press unit that presses down the sludge in the primary compression chamber downward, and may have a shutter at the lower end for discharging the pre-pressed sludge. Further, the secondary press unit is a horizontal press unit that presses the pre-pressed sludge in the secondary press room in a substantially horizontal direction, and a part of the secondary press room is located below the shutter. The pre-pressed sludge may be able to be received from this shutter. The coolant may be oily.
In this configuration, a certain amount of grinding sludge supplied into the primary press unit with the shutter closed is pre-pressed in the primary press unit. The pre-pressed sludge is
It is discharged from the shutter into the secondary press section, and is further squeezed by the secondary press section to be solidified. In this case, since the primary press section is vertical, the occupied floor area can be small, and the sludge that has been pre-pressed can be easily supplied to the secondary press section by dropping from the shutter at the lower end. Since the secondary press section is horizontal, the coolant squeezed out of the grinding sludge can escape in the lateral direction without collecting around the sludge being pressed. Therefore, it is easy to discharge the squeezed coolant, and it is possible to more efficiently solidify the coolant by pressing.

[0008] In the solidified product manufacturing apparatus of the present invention, 1
The sludge charging section for charging the concentrated sludge to the next press section may be a vertical sludge charging section for dropping sludge from a hopper to a sludge inlet below the hopper. By making the sludge charging section vertical, smooth sludge charging can be performed with a compact configuration.

[0009] In the solidified product manufacturing apparatus of the present invention, 1
A heating means for heating and holding the next press section in a predetermined temperature range may be provided. The viscosity of the coolant in the grinding sludge is
Higher temperatures are lower than normal temperatures. Therefore, by providing the heating means and thus heating and holding the concentrated sludge in the primary press section, the coolant can be easily drawn, and the time required for the press step can be shortened. 2
In the subsequent press section, the pre-pressed sludge heated in the primary press section is supplied, so that the press can be performed at a high temperature without separately providing a heating means. The primary press section requires less pressing force than the secondary press section and requires only a simple configuration, so that the heating means can be easily provided. for that reason,
By providing the heating means in the primary press section, it is possible to press the heated state over the primary and secondary presses with a simple configuration.

[0010] In the solidified product manufacturing apparatus of the present invention, 2
Pressurization control means for controlling the pressurization for squeezing the next press unit to a predetermined pressure and a predetermined compression speed may be provided.
In the process of the secondary press, which squeezes the solidified material, a large pressurizing force is required. Due to the viscosity of the coolant and the small gap between the grinding chips, the pressure and the compression speed are reduced by the efficiency of the compression. And the finished state. Therefore, by providing a pressurizing control means in the secondary press section, it is possible to produce a solidified product having a desired component and strength in a short time, even for grinding sludge containing oily coolant having high viscosity.

In the solidified product manufacturing apparatus of the present invention, 2
A discharge port for the solidified material may be provided in the next press section, a carry-out path following the discharge port may be branched into two paths, and a sorting means may be provided for sorting the solidified substance discharged from the discharge port into the two paths. . As described above, by branching the carry-out path following the outlet of the solidified matter into two paths and providing the sorting means, the solidified matter can be sorted out into a good product, a defective product, and the like, and carried out.

When the path is branched in this way, a pressure sensor is provided in the secondary press section, and a sorting control means for controlling the sorting operation of the sorting means by comparing the pressure detected by the pressure sensor with a threshold value is provided. Is also good. In the secondary press section, even if pressed to a predetermined capacity, if the pressing pressure does not reach the predetermined pressure, the manufactured solidified product is not sufficiently solidified and has insufficient strength. . For this reason, a pressure sensor is provided in the secondary press section, and the sorting operation is performed according to the detected pressure, so that sorting can be performed efficiently, and defective products are not mixed, and only solid products of good products are carried out from a predetermined route. can do.

[0013] The grinding sludge handled by the solidified product manufacturing apparatus of the present invention may be generated in a grinding line of a quenched part which is an iron-based component of a rolling bearing. The iron-based components are, for example, an inner ring, an outer ring, and rolling elements. In the process of grinding the components of a rolling bearing, oil-based coolant is often used, and grinding sludge is hard and fine, and grinding sludge that is difficult to solidify is generated. However, the grinding waste is grinding waste such as high-quality bearing steel and is generally mass-produced, so that it becomes grinding sludge having a relatively constant component. Therefore, when it is solidified, a high-quality solidified material is obtained as a steelmaking material. In addition, the conditions for pressing for solidification are easily set, and solidification can be stably performed by setting appropriate conditions.

[0014]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the concept of a processing method and a processing apparatus for grinding sludge including this briquette manufacturing apparatus, and FIG. 2 is a schematic explanatory view thereof. In the grinding line 1, grinding is performed by a grinding machine 2 using coolant supplied from a coolant tank 3. Grinding sludge consisting of grinding waste and coolant generated in the grinding machine 2 is:
Filtration is performed by the filtration means 4, and the concentrated sludge generated by the filtration is solidified by pressing into a briquette B in a briquette manufacturing apparatus 5, which is a solidification product manufacturing apparatus of this embodiment. The filtration device 4 and the briquette manufacturing device 5 constitute a solidifying device 6. The coolant generated by the filtration in the filtering means 4 and the coolant generated by the squeezing in the briquette manufacturing apparatus 5 are returned to the coolant tank 3 of the grinding line 1 by the recovery paths 7 and 8, respectively. The coolant is returned from the recovery paths 7 and 8 to the coolant tank 3 via the filter and the pump. In addition, coolant tank 3
The coolant is supplied to the grinding machine 2 via a filter and a pump. The briquettes B solidified by the briquette manufacturing apparatus 5 are transported to a steel maker 9 and used as steel products by the steel maker 9. For transport of briquette B,
As shown in FIG. 1B, a plurality of containers are accommodated in a transport container 10 called a flexible container bag or the like, and are carried out by a truck or the like. In the steelmaking maker 9, the briquette B is used as a steelmaking material in the arc furnace 11 or the like. The manufactured steel material is used as a material of an object to be ground.

An object to be ground by the grinding line 1 is a hardened part, such as a bearing steel material such as a bearing steel. For example, the quenched component is an iron-based component of a rolling bearing, and specifically, a race such as an inner ring or an outer ring, or a rolling element such as a ball. Oil-based coolant is used as the coolant for grinding. As bearing steel materials, high-hardened chromium steel (SUJ2 etc.), medium carbon steel (S53C
And the like, and induction hardened material of case hardened steel (SCR415 etc.). The grinding sludge generated in the grinding machine 2 is a fluid having a coolant amount of 90 wt% or more.
The remainder is powdery grinding dust and a small amount of abrasive grains. Grinding debris generally has a short, curled linear shape. In the state of the concentrated sludge filtered by the filtering means 4, this grinding sludge contains almost half of the coolant.
The components of the concentrated sludge are, for example, approximately 50 wt% of grinding waste made of bearing steel and the like, and approximately 50 wt% of coolant, and are trace abrasive grains. The component of briquette B is a steel material composed mostly of grinding waste, and the amount of coolant is 5 to 10 wt.
% And contains only a trace amount of abrasive grains remaining after most have been discharged together with the coolant during the solidification process. Even if the briquette B contains a very small amount of abrasive grains, if the grinding waste is a high-quality steel material such as a bearing steel, the use as a steelmaking material is not hindered. The briquette B has a predetermined strength, for example, a strength that does not result in three or more fragments even when dropped from a height of 1 m. It should be noted that the briquette B does not contain any binder (cutting chips or the like) for hardening grinding chips.

As shown in FIG. 2, the filtering means 4 includes a settling facility 15 and a filter facility 16. Grinding line 1
The grinding sludge generated in the above is first led to the sedimentation facility 15,
The precipitated grinding sludge is guided to the filter equipment 16 by the pump 17 and filtered again. Filter equipment 16
A pressurized belt filter that uses a filter belt 18 and pressurizes and filters the grinding sludge with compressed air is used.

As shown in FIGS. 3 and 5, the briquette manufacturing apparatus 5 includes a primary press section 31 for storing a predetermined amount of concentrated sludge and pre-pressing the same, and pressing the pre-pressed sludge at a predetermined pressure. And a secondary press section 32 that solidifies by pressing. The primary press section 31 is a vertical cylinder type 1
The sludge in the next squeezing chamber 33 is transferred to the piston-like pressing member 4.
1 is a vertical press for pressing downward, and has a shutter 35 at its lower end for discharging pre-pressed sludge. The pressing member 41 includes a pressing drive source 42 such as a hydraulic cylinder.
Is driven up and down. Sludge inlet 38 is in primary press room 3
3 is provided on the side surface. The secondary press section 32 is a horizontal press section that presses the pre-pressed sludge B ′ in the horizontal cylinder-shaped secondary press chamber 34 in a substantially horizontal direction between the piston-shaped pressing members 43 and 44 on both sides. You. One end of the secondary pressing chamber 34 in the pressurizing direction is located below the shutter 35 and is a receiving portion 34a that can receive the pre-pressed sludge B 'from the shutter 35. Secondary pressing room 3
The other end of 4 is a briquette discharge port 34b, and a discharge path 47 for briquette B is formed by a chute or the like following the discharge port 34b. The pressure members 43 and 44 are driven forward and backward by pressure drive sources 45 and 46. Both or one of the pressure drive sources 45 and 46 or one of the pressure drive sources 45 is controlled to a predetermined pressure and a predetermined compression speed by a pressure control unit 48. One pressing member 43 of the pair of pressing members 43 and 44 is a movable-side member that presses while moving forward during squeezing. The other pressing member 44 is a fixed member that maintains a fixed position during squeezing and retreats when the briquette B is discharged.

The sludge feeding section 36 for feeding the concentrated sludge to the primary press section 31 is a vertical sludge feeding section for dropping sludge from a hopper 37 to a sludge inlet 38 below the hopper 37. In the hopper 37, a stirring blade 39 for stirring the sludge inside and for pushing the sludge to the hopper outlet on the bottom surface is provided. In FIG. 3, the sludge charging section 36 is provided as shown by a two-dot chain line in FIG. 3, and is drawn out to another portion in FIG. The primary press section 31 is provided with a heating means 40 (FIG. 5) for heating and maintaining the temperature of the concentrated sludge within a predetermined temperature range. The heating means 40
Specifically, it is means for heating and maintaining the temperature of the internal grinding sludge within a predetermined temperature range, and includes an electric heater, a hot air blower, a circulation path of a heat medium, and the like.

Briquette outlet 34 of secondary press 32
As shown in FIG. 4, the discharge path 47 following b is branched into first and second paths 47A and 47B, and briquettes B discharged from the discharge port 34b are separated into two paths 47.
A sorting means 70 for sorting the A and 47B is provided. The first route 47A is a non-defective product carrying route and is composed of a chute. The sorting means 70 is constituted by a vertically rotatable opening / closing lid following the skill of the first path 47A. The sorting means 70 composed of the opening / closing lid is inclined in the closed state, the upper surface also serves as a chute, and rotates downward around the fulcrum 71 at the upper end, thereby blocking the first path 47A. The second path 47B is a defective product carrying-out path, and is composed of a drop path for dropping solidified defective sludge B ″ from the open drop opening of the selection means 70. The selection means 70 is a selection drive (opening / closing drive in this example). ), And the selection driving means is controlled by the selection control means 73. The selection control means 7
Reference numeral 3 compares the detected pressure of the pressure sensor 74 provided in the pressing drive source 45 of the secondary press section 32 with a threshold value, and controls the selection operation of the selection means 70 according to the comparison result. For example, if the detected pressure is equal to or higher than the threshold, the sorting unit 70 is set to pass to the non-defective product path 47A, and if the detected pressure is less than the threshold, the sorting unit 70 is set to pass to the defective product path 47B. When the pressure drive source 46 is a hydraulic cylinder, for example, the pressure sensor 74 is a unit that detects a hydraulic pressure such as a back pressure thereof. The pressure sensor 74 may detect the pressing force of the pressing drive source 45 and convert the pressure from the detected pressing force.
For example, a pressing force detecting unit that detects a load acting on the pressing member 43 pressed by the pressing driving source 45 is provided with a pressure sensor 7.
4 may be used.

The pressure control means 48 in FIG. 3 controls the pressure driving source 45 of the movable side pressure member 43 so as to have a predetermined pressure and a predetermined compression speed as follows. The pressure driving source 46 of the fixed-side pressure member 44 may be controlled by the pressure control means 48 or may be controlled by another pressure control means. May not be performed. Specifically, the pressurizing control unit 48 controls the pressurizing drive source 45 while monitoring a detection value of a pressurizing force detecting unit (not shown) for detecting a pressing force acting on the pressurizing member 43. You. For example, a load cell can be used as the pressing force detecting means. In this case, as shown in FIG. 6, when the pressure applied by the pressure member 43 reaches the target pressure Pmax, the pressurizing control means 48 keeps the pressure for a certain period of time and then releases the pressure. Control.
The fixed time is set to 10 seconds or more. Target pressure Pma
x is set to 400 MPa or less. In addition, as shown in FIG. 7, it is preferable that the pressurizing control unit 48 performs an operation of maintaining a constant pressure for a fixed time a plurality of times while gradually increasing the pressure for squeezing. The fixed time during which the pressure is maintained during the pressurization is 2 to 3 seconds. Further, the pressurization control means 48 controls to gradually reduce the compression speed.

The operation of the briquette manufacturing apparatus 5 will be described. In FIG. 3, with the shutter 35 closed, a certain amount of concentrated sludge is put into the primary press section 31 from the hopper 37, and the apparatus stands by for the temperature of the sludge to rise. When the sludge in the primary press section 31 is heated to a predetermined temperature range by heating by the heating means 40 (FIG. 5), the pressing member 4
Lower 1 and pre-press. The pre-pressed sludge B ′ is dropped into the receiving portion 34 a at one end of the secondary press portion 32 by opening the shutter 35. Although this drop is performed by its own weight, it may be forcibly performed by lowering the pressing member 41 of the primary press unit 31. The pre-pressed sludge B ′ that has entered the secondary press section 32 is pressed in the secondary press chamber 34 by the pressurization between the pressurizing members 43 and 44 on both sides and solidified to form briquettes B. The briquette B manufactured in this manner is discharged from the briquette discharge port 34b by retreating the discharge-side pressing member 44 and further moving the receiving-side pressing member 43, and is discharged through the discharge path 47. . The unloading by the unloading path 47 is performed by selecting the non-defective briquette B and the poorly solidified sludge B ″ by the sorting unit 70. This sorting is performed by the pressure detection sensor 74 (see FIG. In 4), the pressurized pressure is detected. If the pressure is equal to or higher than the threshold, the pressure is conveyed to the non-defective product path 47A.

The manufactured briquette B has a cylindrical shape having an outer diameter equal to the inner diameter of the compression chamber 34 of the secondary press section 32,
Size. For example, as shown in FIG. 10, a briquette B has a diameter D of about 80 mm and a height H of 60 to 70 mm.
And the weight of one piece is about 600 to 700 g.

According to the briquette manufacturing apparatus of this configuration,
Since the grinding sludge concentrated by filtration was further pre-pressed in the primary press section 31, the secondary press section 3
2 makes pressing easier. In other words, by pre-pressing and pressing it again in the secondary press unit 32, it is possible to set appropriate pressing conditions according to the pressing stage,
Pressing can be performed until the amount of coolant is sufficiently reduced, and pressing can be performed efficiently. The primary press section 31 and the secondary press section 32 can be operated in parallel, and can perform pressing more efficiently. Further, since the heating means 40 for heating and holding the primary press section 31 in a predetermined temperature range is provided, the viscosity of the coolant is reduced, and depending on the temperature, the coolant can be made as viscous as the aqueous coolant, and the coolant is easily squeezed out during squeezing. In the secondary press section 32, the pre-pressed sludge heated in the primary press section 31 is supplied, so that the press can be performed at a high temperature without a separate heating means. Further, in the secondary press section, since the pressure is controlled at a predetermined pressure and a predetermined compression speed as described later, solidification can be performed more efficiently, and a strong briquette which does not easily collapse can be manufactured.

Since the primary press section 31 is of a vertical type, the occupied floor area can be small, and the supply of the pre-pressed sludge B 'to the secondary press section 32 is performed by dropping from the shutter 35 at the lower end. Easy to do. Secondary press part 3
Since 2 is horizontal, the coolant squeezed out of the grinding sludge can escape in the lateral direction without collecting around the sludge being pressed. Therefore, it is easy to discharge the squeezed coolant, and the solidification by pressing can be performed more efficiently. A sludge feeding section 36 for feeding concentrated sludge to the primary press section 31 includes a hopper 37.
Since it is of a vertical type in which sludge is dropped into a sludge inlet 38 below the sludge, the sludge can be smoothly fed in a compact configuration.

The control of the pressure and the compression speed of the secondary press 32 will be described. Under the control of the pressurization control means 48, when the compression pressure reaches the target pressure Pmax (FIGS. 6 and 7), the pressure is maintained for a certain period of time. The fixed time for maintaining the pressure is 10 seconds or more. Further, the pressurizing control means 48
Causes the operation of maintaining a constant pressure for a certain period of time to be performed a plurality of times while gradually increasing the pressure for squeezing. FIG.
In the example, the pressure is maintained five times during one cycle of pressurization, including the maintenance at the target pressure Pmax. The fixed time during which the pressure is maintained during pressurization is, for example, 2
３3 seconds. The compression speed is gradually reduced.

As an example of the numerical values of the compression speed and the pressure during pressure holding, the compression speed is, for example, the first stage: 6.5 cm / sec.
Second stage: 6.1 cm / sec Third stage: 5.7 cm / sec
Fourth stage: 4.8 cm / sec. The pressure at which the compression speed is switched (the pressure at which the pressure is temporarily held) is 40 MPa for the first time, 120 MPa for the second time, and 24 for the third time.
0 MPa, 4th time: 360 MPa. The maximum pressure (target pressure Pmax) was 400 MPa.

Due to the viscosity of the coolant, the seepage of the coolant from the sludge during squeezing causes a delay with respect to the pressing operation. In particular, in the case of highly viscous oil-based coolant,
The oozing delay is large. Therefore, as described above, in the middle of gradually increasing the pressure, by maintaining the pressure for a certain period of time and repeating the operation of increasing the pressure again, the concentrated sludge under the condition in which the curled cutting chips are entangled and easily solidified, Viscous coolant can be efficiently squeezed out while solidifying without decomposing into sludge. In addition, the manufactured briquettes can have a low coolant content. The reason why the maximum value of the pressure for squeezing was 400 MPa or less, as a result of the experiment, even if the pressure at the time of squeezing was larger than 400 MPa, a decrease in the coolant content of the briquette, and strength improvement could not be expected,
This is because it has been found that briquettes having an appropriate coolant content and strength can be obtained at 400 MPa.

The action of the heating of the grinding sludge by the heating means 40 of the primary press section 31 will be described. First, a process of squeezing oil-based coolant from grinding sludge will be considered.
Here, the process in which the coolant oozing from the grinding sludge flows out of the compression chamber will be considered. Considering the flow in the annular gap shown in FIG. 8, the flow rate Q is represented by the following equation. Q = [πd (p1-p2) δ ³ ] / (12 μL) where, d: shaft diameter δ: clearance μ: viscosity coefficient L: length (length of fitting of the shaft to the cylinder inner surface) (p1 −p2): pressure difference. In addition, considering the briquette manufacturing apparatus of FIG.
The above-mentioned shaft diameter d is the pressing members 43, 4 of the secondary pressing section 32.
4, and the gap δ corresponds to a gap between the inner diameter surface of the compression chamber 34a serving as a cylinder chamber and the pressing members 43 and 44.

From the above equation, it can be seen that to increase the solidification capacity of the oil-based coolant-containing sludge, the gap δ and the length L
To improve any of the viscosity μ. The gap δ is affected by the third power, but it is necessary to finish the cylinder inner diameter and the shaft diameter to tight tolerances by polishing. However, since the gap is considered to be closely related to the ejection of the sludge, it is necessary to set an appropriate gap in the test. The length L needs to be as short as possible, but this is also considered to be closely related to the ejection of the sludge, so that it is necessary to set an appropriate relationship between the length and the gap in the test. . Since the flow rate increases as the viscosity μ decreases, the solidification treatment is desirably performed under low viscosity conditions. In addition, the above equation indicates the flow rate when the exuded coolant flows out of the compression chamber.Since the viscosity μ is a resistance that exudes through the gap between the grinding chips inside the sludge, The lower the viscosity μ, the better.

FIG. 9 is a graph showing the relationship between the temperature and the viscosity of the oil-based coolant. According to this example, it can be seen that increasing the coolant from about 20 ° C. at room temperature to about 60 ° C. reduces the viscosity to about １ ／. Therefore, it can be seen that by raising the temperature of the grinding sludge containing the coolant to about 60 ° C., the time for the solidification treatment can be significantly reduced. However, when the temperature of the grinding sludge exceeds 60 ° C., the temperature of the apparatus becomes too high, which makes it difficult to perform inspections and the like by an operator during operation, and may cause an influence on the surroundings and a risk of fire. On the other hand, when the temperature is lower than 20 ° C. which is close to room temperature, the decrease in viscosity due to heating is insufficient. Therefore, the heating and holding temperature is preferably in the range of 20 to 60 ° C.

[0031]

According to the present invention, there is provided an apparatus for producing a solidified product of a grinding sludge, wherein a concentrated sludge obtained by filtering a grinding sludge containing a coolant is solidified by pressing to produce a solidified product. And a primary press unit for pre-pressing and containing a fixed amount of the pre-pressed sludge and pressing the pre-pressed sludge under a predetermined pressure to solidify 2
Since it is provided with the next press section, even if it is grinding sludge of a quenched part or grinding sludge containing oil-based coolant, it can be efficiently solidified, and a solid solidified material which is hard to collapse can be produced. The primary press section is a vertical press section that presses sludge downward, has a shutter at a lower end, and the secondary press section is a horizontal press section that presses pre-pressed sludge in a substantially horizontal direction. If the pre-pressed sludge can be received directly from the primary press section, the apparatus can be made compact and the sludge can be easily transported between the primary and secondary press sections.
In addition, the coolant squeezed out in the secondary press section can be easily discharged, and solidification can be performed more efficiently.

[Brief description of the drawings]

FIG. 1A is a block diagram showing a conceptual configuration of a grinding sludge processing process using a grinding sludge briquette manufacturing apparatus according to an embodiment of the present invention, and FIG. 1B is an explanatory diagram of an example of use of the briquette. is there.

FIG. 2 is a schematic explanatory view of a grinding sludge processing apparatus including the briquette manufacturing apparatus.

FIG. 3 is a sectional view of the briquette manufacturing apparatus.

FIG. 4 is a cutaway front view of an unloading path and a sorting means of the briquette manufacturing apparatus.

FIG. 5 is a partially enlarged cross-sectional view of the briquette manufacturing apparatus.

FIG. 6 is a graph schematically showing a relationship between a pressurizing time and a pressure.

FIG. 7 is a graph showing a specific example of a relationship between a pressurizing time and a pressure.

FIG. 8 is an explanatory diagram of a model that considers a coolant squeezing process.

FIG. 9 is a graph showing a relationship between coolant temperature and viscosity.

FIG. 10 is a perspective view showing an example of a briquette shape.

FIG. 11 is a block diagram showing a conventional method for treating grinding sludge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Grinding line 2 ... Grinding machine 4 ... Filtration means 5 ... Briquette manufacturing equipment (solidified material manufacturing equipment) 15 ... Sedimentation equipment 16 ... Filtration equipment 18 ... Filter belt 31 ... Primary press part 32 ... Secondary press part 34 ... Pressing Chamber 40 ... Heating means 43,44 ... Pressing members 45,46 ... Pressing drive source 47 ... Unloading path 47A, 47B ... Path 48 ... Pressure control means 70 ... Selection means 74 ... Pressure sensor B ... Bricket (solidified material)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B30B 15/34 B30B 15/34 Z C02F 11/00 ZAB C02F 11/00 ZABK (72) Inventor Tetsuo Suzuki Shizuoka 1578 Higashikaizuka, Iwata-city

Claims (9)

[Claims] A concentrated sludge obtained by filtering a coolant-containing grinding sludge generated in a quenched part grinding line,
An apparatus for manufacturing a solidified product of grinding sludge, which solidifies by pressing to produce a solidified product, comprising: a primary press unit for storing a predetermined amount of the concentrated sludge and pre-pressing the pre-pressed sludge; An apparatus for producing a solidified product of grinding sludge, comprising: a secondary press section that squeezes and solidifies by pressing. 2. The primary press section is a vertical press section that presses down sludge in a primary compression chamber downward, and has a shutter at a lower end for discharging pre-pressed sludge,
The secondary press section is a horizontal press section that presses the pre-pressed sludge in the secondary press chamber in a substantially horizontal direction, and a part of the secondary press chamber is located below the shutter, and The apparatus for producing a solidified product of grinding sludge according to claim 1, which is capable of receiving pre-pressed sludge from the apparatus. 3. A sludge charging section for charging the concentrated sludge into the primary press section is provided from a hopper below the sludge charging section.
The apparatus for producing solidified grinding sludge according to claim 1 or 2, wherein the sludge is dropped into a sludge inlet of a next press section. 4. The apparatus for producing a solidified product of grinding sludge according to claim 1, further comprising heating means for heating and holding said primary press section in a predetermined temperature range. 5. The pressurizing device according to claim 1, further comprising a pressurizing control means for controlling pressurizing for squeezing the secondary press unit to a predetermined pressure and a predetermined compression speed. Solid sludge production equipment for grinding sludge. 6. A discharge port for a solidified material is provided in the secondary press section, a carry-out path following the discharge port is branched into two paths, and the solidified substance discharged from the discharge port is distributed to the two paths. The apparatus for producing a solidified product of grinding sludge according to any one of claims 1 to 5, further comprising a sorting means. 7. A pressure sensor is provided in the secondary press section,
7. A sorting control means for comparing the detected pressure of the pressure sensor with a threshold value to control the sorting operation of the sorting means.
3. A solid sludge production apparatus for grinding sludge according to claim 1. 8. The apparatus for producing solidified grinding sludge according to claim 1, wherein the coolant is oily. 9. The apparatus for producing solidified grinding sludge according to claim 1, wherein the quenched component is an iron-based component of a rolling bearing.