JP5178256B2 - Solidified product manufacturing apparatus and method for grinding sludge - Google Patents

Description

  The present invention relates to a grinding sludge solidified product manufacturing apparatus for solidifying grinding sludge generated in a grinding line, for example, iron-based components such as inner and outer rings of rolling bearings, rolling elements, and other grinding steel sludge into briquettes. And a manufacturing method.

Iron-based components such as inner and outer rings of rolling bearings and rolling elements are ground on the rolling surfaces after quenching. Powdered cutting waste generated by grinding flows out as a sludge to the outside of the machine and is discharged, and after filtration, the coolant is reused for grinding. The grinding sludge remaining after filtration is landfilled as sludge.
However, it is clear that landfilling of grinding sludge is not preferable from the viewpoint of the environment, and that landfill processing will not be possible in the future due to the dead end of the industrial waste treatment plant. The amount of grinding waste generated by grinding is smaller than that of cutting or the like, but in a mass production line such as a bearing, the amount generated is large.

For this reason, it is considered that the coolant that has been solidified by squeezing the grinding sludge and reused the squeezed coolant and that the solidified product (hereinafter referred to as “briquette”) is reused as a steel product. Patent Documents 1 and 2 disclose an apparatus or method for solidifying grinding sludge. Patent Document 1 describes that the pressurization speed is controlled by detecting changes in temperature, coolant content, pressurization speed, and pressurization pressure. Patent Document 2 describes a method of squeezing at a constant pressure increase speed.
Japanese Patent No. 3907717 Japanese Patent No. 3979137

  In the solidification of grinding sludge as described above, even if the molding pressure and molding speed are set optimally, if the properties of the grinding sludge fluctuate depending on the finishing conditions in the pretreatment process such as filtration, the moldability is poor. There is a case. The moldability is also affected by the wear of the mold. More specifically, even if good molding is initially performed, for example, when the content of coolant in the grinding sludge increases or when the wear of the mold progresses, the grinding sludge is removed from the mold gap during molding. It may be sprayed with coolant and normal molding may not be possible. In this case, adjustment is made to reduce the molding speed to avoid ejection, but if it is too low for safety reasons, the processing capacity will be reduced. In addition, it is complicated to adjust the molding conditions according to the change in properties of the grinding sludge and the wear of the mold, and efficient operation and stable operation cannot be realized.

  Patent Document 1 describes a method of controlling to a predetermined pressure and a predetermined compression speed, but the pressure of the molding pressure that is likely to be accompanied by the ejection of air or sludge sludge during pressure molding of the grinding sludge. No response has been described focusing on pressure fluctuations. Further, Patent Document 2 only describes the effectiveness of a constant pressure increase speed for obtaining a good finished state, and does not describe the correspondence focusing on the pressure fluctuation of the molding pressure similar to the above.

  The object of the present invention is to smooth the solidification by automatically adjusting the pressure fluctuation of the molding pressure accompanying the ejection of the grinding sludge, etc., when the grinding sludge is solidified by pressing with a pressure cylinder. And providing a grinding sludge solidified material manufacturing apparatus and manufacturing method capable of realizing efficient operation of the apparatus.

The grinding sludge solidified product manufacturing apparatus according to the present invention is a method for producing a solidified product of a ground sludge that is produced by solidifying a concentrated sludge obtained by filtering a coolant-containing grinding sludge generated in a grinding line by pressing with a pressure cylinder. an apparatus, wherein a pressure sensor for monitoring the pressure of the pressure cylinder, per signal of the pressure detection sensor, the electric signal filtering, except for gradual pressure variation, extracting only rapid change process and signal processing apparatus for the a pressurization rate adjusting means for adjusting the pressurization rate of the pressure cylinder, monitors the signals under pressure detected by the signal processor, the signal is set to come to exceed the constant change rate, provided the inflation speed control means for adjusting in accordance with the setting based on the pressurization rate of the pressure cylinder to the pressing speed adjusting means And wherein the door.

A method for producing a solidified product of a grinding sludge according to the present invention is a method for producing a solidified product of a ground sludge in which a concentrated sludge obtained by filtering a coolant-containing grinding sludge generated in a grinding line is solidified by pressing with a pressure cylinder to produce a solidified product. a method, a pressure detection sensor for monitoring the pressure of the pressure cylinder, per signal of the pressure detection sensor, the electric signal filtering, except for gradual pressure variation, extracting only rapid change process and signal processing apparatus for, the use of a pressurization rate adjusting means for adjusting the pressurization rate of the pressure cylinder, monitors the signals under pressure detected by the signal processor, the signal is set to come to exceed the constant change rate, and wherein the to be adjusted according to set criteria for pressurization rate of the pressure cylinder to the pressing speed adjusting means.

  According to the configuration of the present invention, the coolant-containing grinding sludge generated in the grinding line is filtered to be concentrated sludge, and solidified by pressing with a pressure cylinder. At this time, when the grinding sludge is squeezed, the pressure of the pressure cylinder is monitored by the pressure sensor, and the signal from the pressure sensor is processed by the signal processing device. Then, when the pressure at the time of pressurization detected by the signal processing apparatus fluctuates more rapidly than the set fluctuation rate, the pressurization speed adjusting means adjusts the pressurization speed of the pressurization cylinder according to the set standard. Therefore, during pressurization, the pressurization speed of the pressurizing cylinder is not affected by the pressurization speed and properties of the grinding sludge, even if the grinding sludge is ejected from the gap between the devices together with air or coolant and normal molding cannot be performed. It is automatically adjusted and quickly returns to normal. Incidentally, in order to obtain a good solidified product, it is desirable to reduce the pressurization speed, but the processing ability will be lowered. However, since the pressurization speed is automatically adjusted when there is a sudden change in pressure during pressurization, an efficient and stable device that balances the processing efficiency and the yield of the molded product (solidified product). Can be realized.

The grinding sludge solidified product manufacturing apparatus according to the present invention is a method for producing a solidified product of a ground sludge that is produced by solidifying a concentrated sludge obtained by filtering a coolant-containing grinding sludge generated in a grinding line by pressing with a pressure cylinder. an apparatus, wherein a pressure sensor for monitoring the pressure of the pressure cylinder, per signal of the pressure detection sensor, the electric signal filtering, except for gradual pressure variation, extracting only rapid change process and signal processing apparatus for the a pressurization rate adjusting means for adjusting the pressurization rate of the pressure cylinder, monitors the signals under pressure detected by the signal processor, the signal is set to come to exceed the constant change rate, provided the inflation speed control means for adjusting in accordance with the setting based on the pressurization rate of the pressure cylinder to the pressing speed adjusting means Therefore, even if grinding sludge is ejected with air and coolant from the gaps of the equipment through a simple method and normal molding cannot be performed, it can be quickly returned to the normal state and the equipment can be operated efficiently. In addition, stable operation can be realized.

A method for producing a solidified product of a grinding sludge according to the present invention is a method for producing a solidified product of a ground sludge in which a concentrated sludge obtained by filtering a coolant-containing grinding sludge generated in a grinding line is solidified by pressing with a pressure cylinder to produce a solidified product. a method, a pressure detection sensor for monitoring the pressure of the pressure cylinder, per signal of the pressure detection sensor, the electric signal filtering, except for gradual pressure variation, extracting only rapid change process and signal processing apparatus for, the use of a pressurization rate adjusting means for adjusting the pressurization rate of the pressure cylinder, monitors the signals under pressure detected by the signal processor, the signal is set to come to exceed the constant change rate, since it was decided to adjust according to the set reference pressurization rate of the pressure cylinder to the pressing speed adjusting means, the and the In addition, even when grinding sludge is ejected from the gaps between the devices together with air and coolant and normal molding cannot be performed by a simple method, the normal operation can be quickly resumed and the equipment can be operated efficiently. In addition, stable operation can be realized.

  An embodiment of a grinding sludge solidified product producing apparatus according to the present invention will be described with reference to FIGS. In the solidified material manufacturing apparatus A shown in FIGS. 1 and 2, the hopper 1 stores concentrated sludge (grinding sludge) M obtained by filtering grinding sludge containing coolant generated in a grinding line (not shown). A screw feeder 2 using a motor 2a as a drive source is installed at the lower end of the hopper 1, and the feed-side tip of the screw feeder 2 faces the cylinder of the cylindrical insertion portion 3 installed vertically. Yes. The hopper 1 and the screw feeder 2 constitute sludge supply means. A pusher 3b fixed to the tip of the rod of the making cylinder 3a is disposed in the making portion 3, and the screw feeder is moved up and down along the axial center direction in the making portion 3 of the pusher 3b as the rod expands and contracts. The concentrated sludge M fed from 2 is pushed downward. A cylinder 4 whose inside is a compression chamber 4 a is horizontally installed at the lower part of the charging part 3, and a charging port 4 b communicating with the lower end of the charging part 3 is provided at the upper part of the peripheral body part.

  Both ends of the cylindrical compression chamber 4a are opened, and the pressure punch 5 and the pressure receiving punch 7 are inserted in an opposing relationship from the openings at both ends. The pressure punch 5 and the pressure receiving punch 7 are connected to the distal ends of the telescopic rods 6a and 8a of the pressure cylinders 6 and 8 that are operated by hydraulic pressure, respectively, and the concentration charged into the pressing chamber 4a from the input port 4b. The sludge M is sandwiched between the pressure punch 5 and the pressure receiving punch 7 by the pressure punch 5 entering the squeezing chamber 4a, and formed into a briquette (solidified material) b described later. The pressurizing cylinder 6 is connected to a hydraulic pump 9 and a hydraulic control device (pressurizing speed adjusting means) 10 via a hydraulic line 11, and a pressure detection sensor 12 is arranged in the middle of the hydraulic line 11. It is installed. The pressure cylinder 8 on the pressure receiving punch 7 side is connected to a hydraulic pressure supply system (not shown), and the pressure receiving punch 7 is made to enter and exit from one end of the pressing chamber 4a, but in FIG. 1 and FIG. Is omitted.

  The pressure signal monitored and detected by the pressure detection sensor 12 is processed by the signal processing device 13, and the signal processing result is sent to the machine control device (pressurization speed control means) 14, and the pressurization speed control means 14 is set. Based on the reference 14a, the pressurizing speed adjusting means 10 adjusts the hydraulic flow rate to adjust the pressurizing speed of the pressurizing cylinder 6. The content of the setting reference 14a may be set as appropriate. As the pressurizing speed adjusting means 10, a mechanical flow rate adjusting valve, a servo valve or the like is used. Details of the adjustment of the pressurization speed of the pressurization cylinder 6 by the pressurization speed control means 14 will be described later.

  The formation procedure of the solidified product (grinding sludge briquette) b by the solidified product manufacturing apparatus A having the above configuration will be described. In FIG. 1, the screw feeder 2 is operated in a state where the pressure receiving punch 7 is positioned in the front opening of the pressing chamber 4a and the pressure punch 5 is positioned in the rear opening of the pressing chamber 4a. As a result, the concentrated sludge M in the hopper 1 is supplied and supplied between the punches 5 and 7 in the pressing chamber 4a through the input part 3 and the input port 4b. At this time, the charging cylinder 3a is operated, and the concentrated sludge M is charged into the pressing chamber 4a by the reciprocating motion of the pusher 3b.

  When a predetermined amount of concentrated sludge M is introduced into the pressing chamber 4a, the screw feeder 2 is stopped and the pusher 3b is moved backward as shown in FIG. With the pressure receiving punch 7 stationary, the pressure cylinder 6 is operated to extend the rod 6a, and the pressure punch 5 is driven into the pressing chamber 4a to drive the concentrated sludge M between the punches 5 and 7. Squeezed into a briquette b. Thereafter, the formed briquette b is discharged from the pressing chamber 4a when the pressure cylinder 8 is operated, the pressure receiving punch 7 is moved backward as shown in FIG. 3, and the pressure punch 5 is further moved forward. After discharging the briquette b, the punches 5 and 7 return to their original positions and wait.

  The molding process shows a state in which the briquette b is normally molded at the initial hydraulic flow rate (pressurization speed). The solid line in FIG. 4A shows the change in the detection signal by the pressure detection sensor 12 when the pressure molding is performed in a normal state where the concentrated sludge M or the like is not ejected by the initial setting of the pressure speed at the time of molding. Show. That is, with the pressurization by the pressurization cylinder 6, the pressure of the pressurization cylinder 6 gradually increases, and after the pressure reaches the set value P0, the pressurization is terminated after being held for a certain time. With the end of pressurization, the pressure drops rapidly and returns to the original state. FIG. 4B shows a change in the detection signal by the pressure detection sensor 12 when the concentrated sludge M or the like is ejected in the pressure molding process. Ejection occurs at time t, and sudden pressure fluctuations occur at that time.

  FIG. 5 shows a signal processing result by the signal processing device 13 when the above rapid pressure fluctuation occurs. The signal processing device 13 takes out only a rapid change except for a gradual pressure change by electrical signal filter processing, and when the signal exceeds a threshold value (set fluctuation rate) L0, ejection of concentrated sludge M or the like occurs. A signal that the ejection has occurred is sent to the pressurization speed control means 14. In the pressurizing speed adjusting means 10, hydraulic flow rates Q1, Q2... Qn (Q1> Q2>... Qn, Qn are minimum) are set in advance. Is selected.

  Initially, the operation of the machine is started at the hydraulic flow rate Qk, and when the pressurization speed control means 14 receives a signal from the signal processing device 13 that ejection of concentrated sludge M or the like has occurred, the pressurization speed control means 14 The pressurization speed adjusting means 10 is commanded according to the reference 14a, and the pressurization speed adjusting means 10 that receives the command switches the hydraulic flow rate to Qk + 1 and lowers the hydraulic flow rate, thereby lowering the pressurization speed of the pressurizing cylinder 6. Adjust as follows. A change in the signal of the detected pressure by the pressure detection sensor 12 when the pressurization speed is lowered is indicated by a broken line in FIG. As shown by the broken line in FIG. 4A, the pressure until the set pressure P0 is reached by reducing the pressurization speed of the pressurization cylinder 6, but the rapid pressure change associated with the ejection of the concentrated sludge M is eliminated. It is understood that

  If the operation is continued with the pressurizing speed of the pressurizing cylinder 6 being lowered in this way, the cycle time of the machine remains long, and the processing capacity decreases. Therefore, for example, when m pieces of concentrated sludge M or the like have not been continuously ejected in this state, the pressurization speed control means 14 instructs the pressurization speed adjustment means 10 according to the setting standard 14a to Is switched from Qk + 1 to Qk, and the pressurization speed is adjusted by increasing the pressurization flow rate. In addition, when adjusting the hydraulic flow rate, if the generation of ejection of concentrated sludge M or the like does not stop even if the flow rate is reduced to Qn, it may be regarded as abnormal and the machine may be stopped. Such a machine stop sequence can also be set in advance in the setting reference 14a.

  In the case of the conventional solidified material manufacturing apparatus that solidifies the bridging b by concentrating sludge M obtained by filtering the coolant-containing grinding sludge generated in the grinding line, the pressurization speed by the pressurization cylinder 6 is increased. The concentrated sludge M may be ejected together with air and coolant from the gaps between the molds (the pressing chamber 4a, the pressure punch 5 and the pressure receiving punch 7), and normal molding and solidification may not be performed. Therefore, in order to obtain a good briquette b, it is better to reduce the pressurization speed by the pressurization cylinder 6, but it is required to increase the pressurization speed from the viewpoint of processing capability. Further, the properties such as the moisture content and bulk density of the concentrated sludge M vary depending on the finished state in a pretreatment process such as filtration, and the degree of wear of the mold (same as above) also changes. For this reason, it is desirable to adjust the pressurizing speed by the pressurizing cylinder 6 according to the properties of the concentrated sludge M or according to the degree of wear of the mold, but this adjustment is complicated, and it is good if the adjustment is neglected. A briquette b cannot be obtained, or the processing ability is reduced.

  Therefore, in the case of the solidified material manufacturing apparatus A of this embodiment, when pressure is applied by the pressurizing cylinder 6, the pressure detection sensor 12 that monitors the pressure of the pressurizing cylinder 6 causes an abrupt pressure change accompanying ejection of the concentrated sludge M or the like. Is detected, the pressurization speed control means 14 causes the pressurization speed adjustment means 10 to automatically adjust the pressurization speed of the pressurizing cylinder 6 in accordance with the setting standard 14a. For this reason, the troublesome adjustment work as described above is not necessary, and a situation in which the adjustment is neglected does not occur. Therefore, a good briquette b can be obtained with a high yield, and the apparatus can be operated efficiently and stably. .

  As the coolant contained in the grinding sludge generated in the grinding line, there are water-soluble coolant and oil-based coolant. Also applies. Further, it is preferably employed when grinding sludge of iron-based components such as inner and outer rings of rolling bearings, rolling elements, and other bearing steel materials is solidified into briquettes.

It is a conceptual diagram which shows the supply process of the grinding sludge in the solidified material manufacturing apparatus which concerns on one Embodiment of this invention. It is a conceptual diagram which shows the pressing process of the grinding sludge in the solidified material manufacturing apparatus. It is a figure which shows the operation state of the pressure punch with respect to the pressing chamber in the process in which the briquette shape | molded in the solidified material manufacturing apparatus is discharged | emitted, and a pressure receiving punch. (A) (B) is a graph which shows the change of the detection signal by a pressure detection sensor in the case of compression molding by a pressure cylinder, (A) shows the case of a normal molding state, (B) is concentration. This shows the case where sludge erupts. It is a graph which shows the result of having processed the detection signal by a pressure detection sensor with the signal processor.

Explanation of symbols

4a ... Compression chamber 6 ... Pressure cylinder 10 ... Pressure speed adjusting means 12 ... Pressure detection sensor 13 ... Signal processing device 14 ... Pressure speed control means 14a ... Setting standard M ... Concentrated sludge (grinding sludge)
L0 ... threshold (set fluctuation rate)
A ... Solidified product manufacturing equipment

Claims (2)

A grinding sludge solidified product producing apparatus for producing a solidified product by solidifying a concentrated sludge obtained by filtering coolant-containing grinding sludge generated in a grinding line by pressing with a pressure cylinder,
A pressure detection sensor for monitoring the pressure of the pressure cylinder, per signal of the pressure detection sensor, the electric signal filtering, except for gradual pressure variation, signal processing for performing processing to extract only rapid change comprising a device, a pressurization rate adjusting means for adjusting the pressurization rate of the pressure cylinder, monitors the signals under pressure detected by the signal processor, the signal exceeds the setting change rate and a to come, the pressurization rate adjusting means to said pressure cylinder rate of pressurizing solidified manufacturing apparatus of the grinding sludge, characterized in that a pressurization rate control means for adjusting in accordance with the setting reference. A method for producing a solidified product of a grinding sludge in which a concentrated sludge obtained by filtering coolant-containing grinding sludge generated in a grinding line is solidified by pressing with a pressure cylinder to produce a solidified product,
A pressure detection sensor for monitoring the pressure of the pressure cylinder, per signal of the pressure detection sensor, the electric signal filtering, except for gradual pressure variation, signal processing for performing processing to extract only rapid change using the device, the pressurization rate adjusting means for adjusting the pressurization rate of the pressure cylinder, monitors the signals under pressure detected by the signal processor, the signal exceeds the setting change rate and a to come, solidified manufacturing method of grinding swarf, characterized in that to adjust according to the set reference pressurization rate of the pressure cylinder to the pressing speed adjusting means.

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