阅读说明：本技术 磁力分离器 (Magnetic separator ) 是由 平田隆幸 于 2019-06-12 设计创作，主要内容包括：在将冷却剂中的磁性粉体去除的磁力分离器中,使冷却剂从贮存槽的侧面流入,与整流板碰撞而流速降低,在获得均一的流速之后向磁性粉体去除用的磁性滚筒输送。因而,在贮存槽的底部容易产生淤渣的堆积,需要抑制该情况。本发明提供一种能够有效地抑制堆积的磁力分离器。在磁力分离器(16)的磁性滚筒(18)的下部的贮存槽(22)内设置分割壁(32),使冷却剂与分割壁(32)碰撞之后向磁性滚筒(18)供给冷却剂。由此,在贮存槽底壁(22a)的冷却剂产生上升的流速,使得磁性粉体难以堆积,并且,能够在没能有效地活用的部分设置进行整流的分割壁(32),小型化变得容易。(In a magnetic separator for removing magnetic powder in a coolant, the coolant is made to flow in from the side of a storage tank, collide with a rectifying plate to reduce the flow velocity, and after a uniform flow velocity is obtained, the coolant is conveyed to a magnetic roller for removing magnetic powder. Therefore, the accumulation of sludge is likely to occur in the bottom of the storage tank, and it is necessary to suppress this. The invention provides a magnetic separator capable of effectively inhibiting accumulation. A partition wall (32) is provided in a storage tank (22) below a magnetic drum (18) of a magnetic separator (16), and a coolant is supplied to the magnetic drum (18) after the coolant collides with the partition wall (32). Thus, the coolant on the bottom wall (22a) of the storage tank generates an increased flow velocity, so that the magnetic powder is difficult to accumulate, and the division wall (32) for rectifying the flow can be provided on the part which is not effectively used, thereby facilitating the miniaturization.)

1. A magnetic separator is provided with: a magnetic drum disposed in a storage tank for storing a coolant so as to be rotatable about a horizontal rotation axis in a state in which a part of the magnetic drum is immersed in the coolant; a guide plate that is provided opposite to a part of an outer peripheral surface of the magnetic drum below a liquid surface of the coolant, and guides the coolant along the part of the outer peripheral surface; and a partition wall provided between the bottom wall of the storage tank and the guide plate, and dividing the storage tank into a dirty liquid tank for storing a coolant before purification and a clean liquid tank for storing a purified coolant, wherein the magnetic separator purifies the coolant by causing magnetic powder in the coolant guided by the guide plate to be adsorbed to the magnetic drum,

the partition wall includes a 1 st flow rectification plate portion facing a bottom wall of the storage tank and a 2 nd flow rectification plate portion facing a side wall of the storage tank on the dirty liquid tank side,

the magnetic separator includes an inlet provided in the dirty liquid tank and configured to pressure-feed the coolant before purification toward the 1 st rectification plate portion or the 2 nd rectification plate portion.

2. Magnetic separator according to claim 1,

the coolant before the cleaning is pressure-fed from the inlet port to the dirty liquid tank by a fluid pump.

3. A magnetic separator as claimed in claim 1 or claim 2,

the inlet is provided in a bottom wall of the storage tank, and pressure-feeds the coolant before purification toward the 1 st rectification plate portion.

4. A magnetic separator as claimed in claim 1 or claim 2,

the inlet is provided in a side wall of the storage tank, and pressure-feeds the coolant before purification toward the 2 nd flow rectification plate portion.

Technical Field

The present invention relates to a magnetic separator (magnetic separator) for removing magnetic powder contained in a coolant from the coolant.

Background

In machine tools such as grinding machines and cutting machines used for manufacturing automobile parts, bearings, and the like, in order to reuse a coolant by removing magnetic powder generated by processing of the components from the coolant, a magnetic separator is used in a circulation path of the coolant to remove the magnetic powder. For example, a magnetic separator shown in patent document 1 includes: a storage tank that receives and stores a coolant; a magnetic drum (magnetic ド ラ ム) supported in the storage tank so as to be rotatable about a horizontal rotation axis, the magnetic drum attracting magnetic powder to a cylindrical outer peripheral surface of the magnetic drum by a magnetic force of a permanent magnet disposed on an inner side of the outer peripheral surface; and a baffle plate for making the flow velocity of the coolant uniform, i.e., for leveling the flow velocity in the storage tank in the vicinity of the inlet through which the coolant flows into the storage tank. The baffle reduces the flow velocity of the coolant flowing from the inlet port, and generates a more uniform flow velocity in the rotation axis direction of the drum than in the case where no baffle is provided, thereby more efficiently removing the magnetic powder by the magnetic drum. Thereafter, the baffle is a rectifying plate.

Disclosure of Invention

Problems to be solved by the invention

In the above-described magnetic separator, the coolant flows in from the inlet port formed in the side surface of the storage tank, collides with the rectifying plate, reduces the flow velocity of the coolant, and is rectified, and then is once sent to the magnetic drum via the bottom of the storage tank below the rectifying plate, so that the deposition of sludge (slurry) made of magnetic powder or the like easily occurs in the bottom of the storage tank. In patent document 1, in order to avoid the accumulation of sludge, the following structure is adopted: a rotating blade for stirring the coolant after the coolant hits the rectifying plate is provided at the bottom of the storage tank, and sludge is less likely to accumulate at the bottom of the storage tank by the stirring.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a magnetic separator having a simple structure in which accumulation of sludge that is less likely to generate coolant in a storage tank is avoided and a rotating blade or the like is not required.

Means for solving the problems

The gist of the invention 1 is (a) a magnetic separator comprising: a magnetic drum disposed in a storage tank for storing a coolant so as to be rotatable about a horizontal rotation axis in a state in which a part of the magnetic drum is immersed in the coolant; a guide plate that is provided opposite to a part of an outer peripheral surface of the magnetic drum below a liquid surface of the coolant, and guides the coolant along the part of the outer peripheral surface; and a partition wall provided between the bottom wall of the storage tank and the guide plate, and dividing the storage tank into a dirty liquid tank for storing a coolant before purification and a clean liquid tank for storing a purified coolant, wherein the magnetic separator purifies the coolant by causing magnetic powder in the coolant guided by the guide plate to be adsorbed to the magnetic drum, and wherein (b) the partition wall includes a 1 st flow rectification plate portion facing the bottom wall of the storage tank and a 2 nd flow rectification plate portion facing a side wall of the storage tank on the dirty liquid tank side, and (c) the magnetic separator includes an inlet provided in the dirty liquid tank and pressure-feeding the coolant before purification toward the 1 st flow rectification plate portion or the 2 nd flow rectification plate portion.

The gist of the invention 2 is the magnetic separator according to the invention 1, wherein the coolant before purification is pressure-fed from the inflow port to the dirty liquid tank by a fluid pump.

The gist of claim 3 is the magnetic separator according to claim 1 or 2, wherein the inlet is provided in a bottom wall of the storage tank, and the coolant before purification is pressure-fed toward the 1 st rectification plate portion.

The gist of the 4 th aspect of the present invention is the magnetic separator according to the 1 st or 2 nd aspect of the present invention, wherein the inlet is provided in a side wall of the storage tank, and the coolant before purification is pressure-fed toward the 2 nd flow rectification plate portion.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the invention of claim 1, there is provided a magnetic separator comprising: a magnetic drum disposed in a storage tank for storing a coolant so as to be rotatable about a horizontal rotation axis in a state in which a part of the magnetic drum is immersed in the coolant; a guide plate that is provided opposite to a part of an outer peripheral surface of the magnetic drum below a liquid surface of the coolant, and guides the coolant along the part of the outer peripheral surface; and a dividing wall provided between a bottom wall of the storage tank and the guide plate, and dividing the storage tank into a dirty liquid tank for storing a coolant before purification and a clean liquid tank for storing a coolant after purification, wherein the magnetic separator purifies the coolant by causing magnetic powder in the coolant guided by the guide plate to be adsorbed to the magnetic drum, and the dividing wall includes a 1 st flow rectification plate portion facing the bottom wall of the storage tank and a 2 nd flow rectification plate portion facing a side wall of the storage tank on the dirty liquid tank side, and the magnetic separator includes an inlet provided in the dirty liquid tank and pressure-feeding the coolant before purification toward the 1 st flow rectification plate portion or the 2 nd flow rectification plate portion. Thus, the coolant rectified by the partition wall forms a flow rising toward the magnetic drum, and therefore, accumulation of sludge contained in the coolant is less likely to occur. Further, the lower portion of the magnetic drum is a space that has not been effectively used in the conventional storage tank, and the partition wall for rectifying the coolant is provided therein, whereby the magnetic separator can be downsized.

According to claim 2, the coolant before the cleaning is pressure-fed from the inflow port to the dirty liquid tank by a fluid pump. This makes it possible to suppress the accumulation of sludge more reliably by the entire flow of the coolant toward the bottom of the dirty liquid tank. In addition, during the stop of the machine tool, the removal of sludge from the coolant can also be performed, and the removal of sludge from the coolant is promoted.

According to claim 3, the inlet is provided in a bottom wall of the storage tank, and the coolant before purification is pressure-fed toward the 1 st rectification plate portion. This suppresses the accumulation of sludge, facilitates the selection of the location of the inlet port of the coolant, improves the degree of freedom in the design of the magnetic separator and the design of the coolant circulation device, and facilitates the miniaturization of the magnetic separator and the coolant circulation device for removing sludge.

According to the 4 th aspect of the present invention, the inlet is provided in a side wall of the storage tank, and the coolant before purification is pressure-fed toward the 2 nd flow rectification plate portion. This suppresses the accumulation of sludge, facilitates the selection of the location of the inlet port of the coolant, improves the degree of freedom in the design of the magnetic separator and the design of the coolant circulation device, and facilitates the miniaturization of the magnetic separator and the coolant circulation device for removing sludge.

Drawings

Fig. 1 is a diagram illustrating the arrangement of a storage tank, a magnetic separator, and a pump of a conventional coolant circulation device.

Fig. 2 is a diagram illustrating the arrangement of a storage container, a magnetic separator, and a pump to which the coolant circulation device of the present invention is applied.

Fig. 3 is a diagram illustrating the configuration of the main part of the magnetic separator of fig. 2.

Fig. 4 is a cross-sectional view of the inlet showing the distribution of flow velocity when the coolant is introduced from the inlet provided at the bottom of the storage tank of the magnetic separator of fig. 2.

Fig. 5 is a graph showing the distribution of the flow velocity of the coolant at a position moved in the axial direction of the magnetic drum in the magnetic separator of fig. 4.

Fig. 6 is a view showing the distribution of flow velocity in a case where the angle of the guide plate of the magnetic separator of fig. 4 is changed in a cross section passing through the inflow port.

Fig. 7 is a graph showing the distribution of the flow velocity of the coolant at a position moved in the axial direction of the magnetic drum in the magnetic separator of fig. 6.

Fig. 8 is a diagram showing a flow velocity distribution in a case where the magnetic separator of fig. 6 is moved so that the coolant does not contact the partition wall by the cross section of the inlet.

Fig. 9 is a graph showing the distribution of the flow velocity of the coolant at a position moved in the axial direction of the magnetic drum in the magnetic separator of fig. 8.

Fig. 10 is a cross-sectional view through the inlet port showing the distribution of flow velocity in the case where the magnetic separator of fig. 8 is reduced in size of the storage tank.

Fig. 11 is a graph showing the distribution of the flow velocity of the coolant at a position moved in the axial direction of the magnetic drum in the magnetic separator of fig. 10.

Fig. 12 is a view showing the distribution of flow velocity in the case where the inlet is provided at the side of the storage tank in the magnetic separator of fig. 4, in a cross section passing through the inlet.

Fig. 13 is a graph showing the distribution of the flow velocity of the coolant at a position moved in the axial direction of the magnetic drum in the magnetic separator of fig. 12.

Description of the reference numerals

16: a magnetic separator;

18: a magnetic drum;

22: a storage tank;

22a, b: a storage tank bottom wall and a storage tank side wall;

30: a guide plate;

32: a partition wall;

32a, b: a 1 st and a 2 nd flow rectification plate parts;

34: an outer peripheral surface;

34 a: a portion of the outer peripheral surface;

40: 1 st pump (fluid pump);

s1: a dirty liquid tank;

s2: a clean liquid tank;

CL: an axis of rotation.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, the drawings are simplified or modified as appropriate, and the dimensional ratios, shapes, and the like of the respective portions are not necessarily drawn accurately.

[ example 1 ]

Fig. 1 is a schematic diagram illustrating basic configurations of a storage tank 138, a magnetic separator 116, and the like of a conventional coolant circulation device 114. The coolant circulation device 114 is constituted by a magnetic separator 116 that removes magnetic powder contained in the coolant discharged from the grinding machine 112 as the machine tool, a reservoir tank 138 that stores the coolant that has passed through the magnetic separator 116, and a feed pump 142 that feeds the coolant stored in the reservoir tank 138 to the grinding machine 112. The magnetic separator 116 includes a reservoir tank 122, a magnetic drum 118 rotatably supported in the reservoir tank 122, and a rectifying plate 132 provided in the vicinity of an inlet 144 through which the coolant flows into the reservoir tank 122. The straight lines indicated by the arrows show the flow of the coolant. The magnetic separator 116 is provided below the grinding machine 112, and a coolant containing magnetic powder used for grinding generates a flow velocity v due to a difference in height between the grinding machine 112 and the inlet 144 of the magnetic separator 116. The flow velocity v of the coolant after passing through the inlet 144 of the coolant circulation device 114 is reduced by collision with the flow rectifying plate 132, and is equalized with respect to the axial direction of the rotation axis CL of the magnet drum 118. The coolant containing the magnetic powder flows into the outlet 146 side of the reservoir tank 122 through the gap between the cylindrical outer peripheral surface 134 of the magnet drum 118 and the guide plate 130. The magnetic powder contained in the coolant is separated and removed from the coolant by adhering to the surface of the outer circumferential surface 134 of the magnetic drum 118 by the permanent magnets provided inside the magnetic drum 118. The magnetic powder adhering to the surface of the magnetic roller 118 is scraped by the scraping plate 120 and collected in the receiving box 148. The coolant that has passed between the outer circumferential surface 134 of the magnetic drum 118 and the guide plate 130 passes through the outflow port 146, and the purified liquid 152 from which the magnetic powder has been removed is stored in the storage tank 138. The cleaning liquid 152 is supplied to the grinding machine 112 by the feed pump 142 when the grinding machine 112 is being machined.

In fig. 2, a coolant circulation device 14 is shown incorporating a magnetic separator 16 of the present invention. The coolant circulation device 14 includes a 1 st tank 36 that stores dirty liquid 50 that is coolant discharged from the grinding machine 12, a magnetic separator 16 that removes magnetic powder contained in the dirty liquid 50 discharged from the grinding machine 12, a 1 st pump 40 (corresponding to a fluid pump, hereinafter, the fluid pump is referred to as the 1 st pump 40) that sends the dirty liquid 50 from the 1 st tank 36 to the magnetic separator 16, a 2 nd tank 38 that stores clean liquid 52 that is coolant from which the magnetic powder is removed by the magnetic separator 16, and a 2 nd pump 42 that sends the clean liquid 52 to the grinding machine 12. The magnetic separator 16 includes a storage tank 22, a magnetic drum 18 rotatably supported in the storage tank 22, a partition wall 32 shown in fig. 3 provided in the vicinity of an inlet 44 through which the contaminated liquid 50 flows into the storage tank 22, a guide plate 30 for feeding the contaminated liquid 50 to the cylindrical outer circumferential surface 34 of the magnetic drum 18, a scraping plate 20 for scraping magnetic powder adhering to the outer circumferential surface 34 of the magnetic drum 18 by a permanent magnet provided inside the magnetic drum 18 from the outer circumferential surface 34 of the magnetic drum 18, and the like. The magnetic powder scraped by the scraping plate 20 is collected in the receiving box 48.

In fig. 2, the flow of the coolant is indicated by a straight arrow, and the flow of the coolant flowing into the 1 st container 36 when the net liquid 52 from which the magnetic powder is removed by the magnetic separator 16 exceeds the storage capacity of the 2 nd container 38 is indicated by a curved arrow. Dirty liquid 50 as a coolant used for grinding is stored in the 1 st container 36. When the clean liquid 52 in the 2 nd container 38 needs to be replenished, the 1 st pump 40 is operated to send the dirty liquid 50 in the 1 st container 36 to the magnetic separator 16 from the inlet 44, and the clean liquid 52 from which the magnetic powder has been removed by the magnetic separator 16 is sent from the outlet 46 and stored in the 2 nd container 38. The clean liquid 52 is supplied to the grinding machine 12 by the 2 nd pump 42 as required, for example, when the grinding machine 12 is operating. When the storage capacity of the 2 nd container 38 is exceeded, the clean liquid 52 overflows and returns to the 1 st container 36. Further, the magnetic separator 16 can be operated even during the stop of the grinding machine 12, and when a request for removing the magnetic powder from the contaminated liquid 50 to further reduce the magnetic powder in the coolant supplied to the grinding machine 12 is made, for example, the 1 st pump 40 and the magnetic separator 16 are operated during the stop of the grinding machine 12, whereby the magnetic powder in the coolant can be further removed.

Fig. 3 is an enlarged view of the magnetic separator 16 in fig. 2. The magnetic separator 16 is shown as viewed from the direction of the rotation axis CL of the magnetic drum 18. The storage tank 22 is divided into a dirty liquid tank S1 on the side of the coolant inlet 44, a clean liquid tank S2 on the side of the coolant outlet 46, and a guide path S3 which is a region between the dirty liquid tank S1 and the clean liquid tank S2, that is, a region sandwiched between the outer peripheral surface 34 of the magnetic drum 18 shown by a long broken line and the guide portion 30a of the guide plate 30 shown by a short broken line. An inlet 44 for the coolant is provided at a substantially central position in the direction of the rotation axis CL of the magnet drum 18, and the coolant sent out from the inlet 44 by the 1 st pump 40 collides with the 1 st flow rectification plate portion 32a of the partition wall 32 shown by a one-dot chain line, whereby the flow velocity v of the coolant is suppressed, and the flow velocity v of the coolant homogenized in the direction of the rotation axis CL of the magnet drum 18 is obtained. The dividing wall 32 is formed of a 1 st flow rectification plate portion 32a and a 2 nd flow rectification plate portion 32b, is formed in parallel with the magnet drum 18 in the direction of the rotation axis CL of the magnet drum 18, and is connected to the side wall 22b of the storage tank 22 in the front and the side wall 22b in the depth in fig. 3 to separate the dirty liquid tank S1 and the clean liquid tank S2. The partition wall 32 is provided below the magnet drum 18 that constitutes a part of the clean liquid tank S2 in the conventional structure. The portion of the clean liquid tank S2 under the magnetic roller 18 is an unnecessary portion, and the partition wall 32 is provided in this portion to provide a space for rectifying the coolant, which also contributes to downsizing of the apparatus. The guide plate 30 is composed of a guide portion 30a and a sloping plate portion 30b, is formed parallel to the magnetic drum 18 in the direction of the rotation axis CL of the magnetic drum 18, and is connected to the front wall and the deep wall of the reserve tank 22 in fig. 3, whereby the clean liquid tank S2 is separated from the guide path S3 and the dirty liquid tank S1. After the coolant collides with the 1 st flow rectification plate portion 32a of the partition wall 32, the coolant rises in the dirty liquid tank S1 in parallel with the swash plate portion 30b of the guide plate 30 and flows into the guide passage S3. Further, the coolant flows into the clean liquid tank S2 through the guide passage S3, and flows out to the 2 nd container 38 from the outflow port 46. During the operation of the magnetic separator 16, the coolant flowing in from the inlet 44 always flows upward in the dirty liquid tank S1, and therefore the accumulation of sludge such as magnetic powder on the bottom wall 22a of the storage tank 22 is suppressed. The outlet 46 is not likely to affect the flow of the coolant in the clean liquid tank S2, and is provided on the end portion side, not shown, in the direction of the rotation axis CL of the magnet drum 18.

A magnetic roller 18 for attracting magnetic powder by magnetic force is provided near the center of the storage tank 22. A squeeze roller (squeezing roller)24 for dehydrating the coolant by pressing the magnetic powder adsorbed to the magnetic drum 18 is shown by a short dotted line, which is in contact with the magnetic drum 18. In the squeeze roll 24, 2 squeeze roll pressing devices 26 for pressing the squeeze roll 24 toward the axial direction of the magnetic drum 18 are provided in the vicinity of and at the depth of fig. 3, and the coolant dehydrated by the squeeze roll 24 is returned to the dirty liquid tank S1. Fig. 3 shows a spring for equalizing the pressing force of the squeeze roller pressing device 26 disposed at the front and a nut for adjusting the pressing force. The magnetic powder which is pressed by the squeeze roller 24 to remove the excess coolant and adsorbed on the outer circumferential surface 34 of the magnet drum 18 is scraped by the scraping plate 20 which is in contact with the surface of the outer circumferential surface 34. The scraping plate 20 has side plates 21 to prevent the scraped magnetic powder from falling off from the scraping plate 20 to the side, i.e., to the front and the depth of fig. 3. Further, a magnetic drum rotation motor 28 is provided to drive the magnetic drum 18 to rotate.

Fig. 4 is an example of analysis of the flow velocity v of the coolant in the magnetic separator 16 shown in fig. 3. For convenience of explanation, the dirty liquid tank S1 and the inlet 44 are disposed on the left side of the magnetic separator 16, and are shown in bilateral symmetry with fig. 3. Fig. 4 shows the distribution of the flow velocity v of the coolant below the liquid surface of the coolant in a cross section including the center of the inflow port 44 provided substantially at the center in the direction of the rotation axis CL of the magnet drum 18. The coolant is held in a space formed by the storage tank bottom wall 22a, the storage tank side wall 22b, and a part of the outer peripheral surface 34a of the magnetic drum 18, that is, a part of the cylindrical outer peripheral surface 34 that is in contact with the coolant. The length of the arrow indicates the magnitude of the flow velocity v of the coolant, and the flow velocity v at the inlet 44 of the coolant fed to the dirty liquid tank S1 by the 1 st pump 40 is set to, for example, about 3m/sec, and the inner diameter of the inlet 44 is set to 25 mm. The coolant flowing in from the inlet 44 collides with the 1 st flow rectification plate portion 32a to rapidly decrease the flow velocity v, and a flow rising in the dirty liquid tank S1 and a flow stirring the coolant in the dirty liquid tank S1 are generated in the interior of the 1 st flow rectification plate portion 32a and the 2 nd flow rectification plate portion 32b and the dirty liquid tank S1. The coolant passes through the guide path S3 formed by the space sandwiched between part of the outer peripheral surface 34a of the magnet drum 18 and the guide portion 30a of the guide plate 30 at a substantially uniform flow velocity v, and a strong flow velocity v is generated in the bottom wall 22a and the side wall 22b of the reservoir tank 22 in the clean liquid tank S2. Further, the outlet 46 is provided at an end portion in the direction of the rotation axis CL of the magnet drum 18, and a state of outflow of the coolant to the outlet 46 is not shown.

Fig. 5 is a graph showing the distribution of the flow velocity v at a position shifted in the rotation axis CL direction of the magnetic drum 18 under the same inflow condition of the coolant as fig. 4. That is, distribution of flow velocity v of the coolant at a cross section passing through the center of inflow port 44 provided substantially at the center in the direction of rotation axis CL of magnetic drum 18 is shown with respect to distribution of flow velocity v shown in fig. 4, and distribution of flow velocity v at a position apart from the center in the direction of rotation axis CL of magnetic drum 18 is shown. In the space formed by the 1 st rectification plate portion 32a and the 2 nd rectification plate portion 32b of the dirty liquid tank S1 and the dirty liquid tank S1 other than the space, a flow stirring the coolant in the dirty liquid tank S1 is generated together with the flow rising in the dirty liquid tank S1. The coolant passes through the guide path S3 formed by the magnet drum 18 and the guide portion 30a of the guide plate 30 at a substantially uniform flow velocity v. Regarding the flow velocity v, although slightly reduced as compared with fig. 4, in the clean liquid tank S2, a strong flow velocity v is generated at the bottom wall 22a and the side wall 22b of the reservoir tank 22. In the actual machine test using the magnetic separator 16 shown in fig. 4 and 5, it was confirmed that the accumulation of sludge containing magnetic powder on the storage tank bottom wall 22a of the magnetic separator 16 was suppressed.

Fig. 6 shows the distribution of the flow velocity v when the angle of the swash plate portion 30b of the guide plate 30 with respect to the 1 st flow rectification plate portion 32a is changed from 60 degrees to 90 degrees, i.e., a right angle. The coolant is held in a space formed by the reservoir bottom wall 22a, the reservoir side wall 22b, and a part of the outer circumferential surface 34a of the magnet drum 18. Fig. 6 shows the distribution of the flow velocity v of the coolant in a cross section including the center of the inflow port 44 provided substantially at the center in the direction of the rotation axis CL of the magnet drum 18. The coolant flowing in from the inlet 44 collides with the 1 st flow rectification plate portion 32a, the flow velocity v rapidly decreases, and a flow stirring the coolant in the dirty liquid tank S1 is generated in the storage tank bottom wall 22a of the dirty liquid tank S1. The coolant passes through the guide path S3 formed by part of the outer circumferential surface 34a of the magnet drum 18 and the guide portion 30a of the guide plate 30 at a substantially uniform flow velocity v, and a strong flow velocity v is generated at the bottom wall 22a and the side wall 22b of the reservoir tank 22 in the clean liquid tank S2. The distribution of the flow velocity v in the clean liquid tank S2 is similar to that in fig. 4. Therefore, even if the angle of the swash plate portion 30b of the guide plate 30 with respect to the 1 st flow rectification plate portion 32a is changed from 60 degrees to about 90 degrees, a flow for stirring the coolant is generated, and sedimentation of the magnetic powder can be suppressed.

Fig. 7 shows the distribution of the flow velocity v at a position apart from the center in the rotation axis CL direction of the magnet drum 18 in the axial direction of the magnet drum 18. In the dirty liquid tank S1, a flow for stirring the coolant in the dirty liquid tank S1 is generated in the dirty liquid tank S1 and in the interiors of the 1 st and 2 nd flow rectification plate portions 32a and 32b, along with the flow rising in the dirty liquid tank S1. The coolant passes through the guide path S3 formed by the magnet drum 18 and the guide portion 30a of the guide plate 30 at a substantially uniform flow velocity v. Regarding the flow velocity v, although slightly reduced as compared with fig. 6, in the clean liquid tank S2, a strong flow velocity v is generated at the bottom wall 22a and the side wall 22b of the reservoir tank 22. The distribution of the flow velocity v is very similar to that of fig. 5. Therefore, even if the angle of the swash plate portion 30b of the guide plate 30 with respect to the 1 st flow straightening plate portion 32a is changed from 60 degrees to about 90 degrees, the effect of the flow straightening of the coolant is hardly affected.

Fig. 8 shows the result of analyzing the influence of the flow velocity v at the rectifying and guiding passage S3 when the inlet 44 of the coolant is moved in the direction away from the rotation axis CL of the magnet drum 18 with respect to the magnetic separator 16 in fig. 6 and changed to the position where the coolant flowing in from the inlet 44 does not collide with the first rectifying plate portion 32a, and the coolant is held in the space formed by the reservoir bottom wall 22a, the reservoir side wall 22b, and part of the outer peripheral surface 34a of the magnet drum 18. Fig. 8 shows the distribution of the flow velocity v of the coolant in the cross section including the center of the inflow port 44 provided substantially at the center in the direction of the rotation axis CL of the magnet drum 18, and the coolant flowing in from the inflow port 44 exhibits a greatly increased flow velocity v also near the magnet drum 18 without colliding with the first flow rectification plate portion 32 a. The flow velocity in the space formed by the 1 st flow straightening plate portion 32a, the 2 nd flow straightening plate portion 32b and the storage tank bottom wall 22a is suppressed to be small, and the magnetic powder is likely to be deposited. The flow velocity v in the guide path S3 shows a flow from the clean liquid tank S2 to the dirty liquid tank S1, and shows a state where the coolant containing the magnetic powder supplied to the outer circumferential surface 34 of the magnetic drum 18 is not sufficiently supplied.

Fig. 9 shows an analysis result of the distribution of the flow velocity v at a position away from the center of the magnetic drum 18 in the axial direction in the direction of the rotation axis CL of the magnetic drum 18 in fig. 8. In the dirty liquid tank S1, a downward flow velocity v is generated. The flow velocity v of the space formed by the 1 st flow straightening plate portion 32a, the 2 nd flow straightening plate portion 32b and the reservoir bottom wall 22a is suppressed to be small, and the magnetic powder is likely to be deposited. The flow velocity v in the guide path S3 shows a flow from the clean liquid tank S2 to the dirty liquid tank S1, and shows a state where the coolant containing the magnetic powder supplied to the outer circumferential surface 34 of the magnetic drum 18 is not sufficiently supplied.

According to the present embodiment, the magnetic separator 16 includes: a magnetic drum 18 disposed in a storage tank 22 for storing the coolant so as to be rotatable about a horizontal rotation axis CL in a state in which a part of the magnetic drum is immersed in the coolant; a guide plate 30 that is provided so as to face a part of the outer peripheral surface 34a of the outer peripheral surface 34 of the magnet drum 18 below the liquid surface of the coolant, and guides the coolant along the part of the outer peripheral surface 34 a; and a dividing wall 32 provided between the bottom wall 22a of the storage tank 22 and the guide plate 30, and dividing the storage tank 22 into a dirty liquid tank S1 for storing the coolant before purification and a clean liquid tank S2 for storing the coolant after purification, wherein the magnetic separator 16 purifies the coolant by causing magnetic powder in the coolant guided by the guide plate 30 to be adsorbed by the magnetic drum 18, wherein the dividing wall 32 includes a 1 st flow rectification plate portion 32a facing the bottom wall 22a of the storage tank 22 and a 2 nd flow rectification plate portion 32b facing the side wall 22b on the dirty liquid tank S1 side of the storage tank 22, and the magnetic separator 16 includes an inlet 44 provided in the dirty liquid tank 1 and pressure-feeding the coolant before purification toward the 1 st flow rectification plate portion 32a or the 2 nd flow rectification plate portion 32 b. Thus, the coolant fluidized by the partition wall 32 forms a flow rising toward the magnetic drum 18, and therefore, the sludge in the coolant is less likely to accumulate. The lower portion of the magnetic drum 18 is a space that has not been effectively used in the conventional reservoir tank 122, and the partition wall 32 for rectifying the coolant is provided therein, whereby the magnetic separator 16 can be downsized.

In addition, according to the present embodiment, the coolant flowing in from the inlet 44 is pumped by the 1 st pump 40 and supplied to the reservoir tank 22. This spreads the entire coolant flow to the bottom of the dirty liquid tank S1, thereby more reliably suppressing the accumulation of sludge. In addition, during the stop of the grinding machine 12, the removal of sludge from the coolant can also be performed, and the removal of sludge from the coolant is promoted.

Further, according to the present embodiment, the inlet 44 is provided in the bottom wall 22a of the reservoir tank 22, and the coolant before purification is pressure-fed toward the 1 st rectification plate portion 32 a. This suppresses the accumulation of sludge, facilitates the selection of the location of the inlet port of the coolant, improves the degree of freedom in the design of the magnetic separator 16 and the design of the coolant circulation device 14, and facilitates the miniaturization of the magnetic separator 16 and the coolant circulation device 14 for removing sludge.

Next, another embodiment of the present invention is explained. In the following description, the same reference numerals are given to the same portions as those of the above-described embodiment, and the description thereof is omitted.

[ example 2 ]

Fig. 10 shows the distribution of the flow velocity v of the coolant when the distance between the inclined plate portion 30b of the guide plate 30 and the side wall 22b of the reservoir tank 22 in the magnetic separator 16 shown in fig. 6 is reduced by about 35% of the distance in fig. 6, thereby reducing the dirty liquid tank S1 of the magnetic separator 16. Otherwise, it is the same as fig. 6 in the foregoing embodiment. The coolant is held in a space formed by the reservoir bottom wall 22a, the reservoir side wall 22b, and a part of the outer circumferential surface 34a of the magnet drum 18. The coolant flowing in from the inlet 44 collides with the 1 st flow rectification plate portion 32a, the flow velocity v rapidly decreases, and a flow stirring the coolant in the dirty liquid tank S1 is generated in the storage tank bottom wall 22a of the dirty liquid tank S1. The coolant passes through the guide path S3 formed by the magnet drum 18 and the guide portion 30a of the guide plate 30 at a substantially uniform flow velocity v, and a strong flow velocity v is generated at the bottom wall 22a and the side wall 22b of the reservoir tank 22 in the clean liquid tank S2. The distribution of the flow velocity v in the clean liquid tank S2 is similar to that in fig. 6.

Fig. 11 shows the distribution of the flow velocity v at a position apart from the center in the rotation axis CL direction of the magnet drum 18 in the axial direction of the magnet drum 18. In the dirty liquid tank S1, a flow is generated that stirs the inside of the 1 st flow rectification plate portion 32a and the 2 nd flow rectification plate portion 32 b. In the dirty liquid tank S1 near the swash plate portion 30b, a flow that rises in the dirty liquid tank S1 is generated. The coolant passes through the guide path S3 formed by the magnet drum 18 and the guide portion 30a of the guide plate 30 at a substantially uniform flow velocity v. Regarding the flow velocity v, almost the same as in fig. 7, in the clean liquid tank S2, a strong flow velocity v is generated at the bottom wall 22a and the side wall 22b of the reservoir tank 22. Therefore, even when the distance between the swash plate portion 30b of the guide plate 30 and the side wall 22b of the reservoir tank 22 in the magnetic separator 16 shown in fig. 6 is set to about 35% of the distance in fig. 6, the flow rectification by the partition wall 32, that is, the uniformity of the flow velocity v of the coolant in the guide passage S3 is substantially the same as that when the distance between the swash plate portion 30b of the guide plate 30 and the side wall 22b of the reservoir tank 22 in the magnetic separator 16 shown in fig. 6 is set.

According to the present embodiment, the same effects as those of embodiment 1 can be expected. That is, the magnetic separator 16 includes: a magnetic drum 18 disposed in a storage tank 22 for storing the coolant so as to be rotatable about a horizontal rotation axis CL in a state in which a part of the magnetic drum is immersed in the coolant; a guide plate 30 that is provided so as to face a part of the outer peripheral surface 34a of the outer peripheral surface 34 of the magnet drum 18 below the liquid surface of the coolant, and guides the coolant along the part of the outer peripheral surface 34 a; and a dividing wall 32 provided between the bottom wall 22a of the storage tank 22 and the guide plate 30, and dividing the storage tank 22 into a dirty liquid tank S1 for storing the coolant before purification and a clean liquid tank S2 for storing the coolant after purification, wherein the magnetic separator 16 purifies the coolant by causing magnetic powder in the coolant guided by the guide plate 30 to be adsorbed by the magnetic drum 18, wherein the dividing wall 32 includes a 1 st flow rectification plate portion 32a facing the bottom wall 22a of the storage tank 22 and a 2 nd flow rectification plate portion 32b facing the side wall 22b on the dirty liquid tank S1 side of the storage tank 22, and wherein the magnetic separator 16 includes an inlet 44 provided in the dirty liquid tank S1 and pressure-feeding the coolant before purification toward the 1 st flow rectification plate portion 32a or the 2 nd flow rectification plate portion 32 b. Thus, the coolant fluidized by the partition wall 32 forms a flow rising toward the magnetic drum 18, and therefore, the sludge in the coolant is less likely to accumulate. The lower portion of the magnetic drum 18 is a space that has not been effectively used in the conventional reservoir tank 122, and the partition wall 32 for rectifying the coolant is provided therein, whereby the magnetic separator 16 can be downsized.

In addition, according to the present embodiment, the coolant flowing in from the inlet 44 is pumped by the 1 st pump 40 and supplied to the reservoir tank 22. This spreads the entire coolant flow to the bottom of the dirty liquid tank S1, thereby more reliably suppressing the accumulation of sludge. In addition, during the stop of the grinding machine 12, the removal of sludge from the coolant can also be performed, and the removal of sludge from the coolant is promoted.

Further, according to the present embodiment, the inlet 44 is provided in the bottom wall 22a of the reservoir tank 22, and the coolant before purification is pressure-fed toward the 1 st rectification plate portion 32 a. This suppresses the accumulation of sludge, facilitates the selection of the location of the inlet port of the coolant, improves the degree of freedom in the design of the magnetic separator 16 and the design of the coolant circulation device 14, and facilitates the miniaturization of the magnetic separator 16 and the coolant circulation device 14 for removing sludge.

Next, another embodiment of the present invention is explained. In the following description, the same reference numerals are given to the same portions as those of the above-described embodiment, and the description thereof is omitted.

[ example 3 ]

Although the inlet 44 through which the coolant flows into the reservoir 22 of the magnetic separator 16 is provided in the reservoir bottom wall 22a in the above-described embodiment, the inlet 44 is provided in the side wall 22b of the reservoir 22 and flows into the 2 nd flow straightening plate portion 32b of the partition wall 32 in the present embodiment. Otherwise, the same configuration as that shown in fig. 4 of embodiment 1 is employed. In the present embodiment shown in fig. 12, the coolant flowing in from the inlet 44 provided in the side wall 22b of the reservoir tank 22 collides with the 2 nd flow rectification plate portion 32b, the flow velocity v rapidly decreases, and the flow velocity v of the coolant rises in the dirty liquid tank S1 above the 1 st flow rectification plate portion 32 a. The coolant passes through the guide path S3 formed by the magnet drum 18 and the guide portion 30a of the guide plate 30 at a substantially uniform flow velocity v, and a strong flow velocity v is generated at the bottom wall 22a and the side wall 22b of the reservoir tank 22 in the clean liquid tank S2.

Fig. 13 shows the distribution of the flow velocity v at a position apart from the center in the rotation axis CL direction of the magnet drum 18 in the axial direction of the magnet drum 18. A flow for stirring the coolant is generated in the space formed by the 1 st flow rectification plate portion 32a and the 2 nd flow rectification plate portion 32b and in the lower portion of the dirty liquid tank S1. In addition, the coolant passes through the guide path S3 formed by the magnet drum 18 and the guide portion 30a of the guide plate 30 at a substantially uniform flow velocity v. The flow velocity v becomes slightly stronger as compared with fig. 12, and in the clean liquid tank S2, a strong flow velocity v is generated at the bottom wall 22a and the side wall 22b of the reservoir tank 22.

According to this embodiment, the same effects as those of the above-described embodiments 1 and 2 can be expected, and the inlet 44 is provided in the side wall 22b of the storage tank 22, and the coolant before purification is pressure-fed toward the 2 nd flow rectification plate portion 32 b. This suppresses the accumulation of sludge, facilitates the selection of the location of the coolant inlet 44, improves the degree of freedom in the design of the magnetic separator 16 and the design of the coolant circulation device 14, and facilitates the miniaturization of the magnetic separator 16 and the coolant circulation device 14 that removes sludge.

In the above-described embodiment, the 1 st flow rectification plate portion 32a of the partition wall 32 is shown in parallel with the reservoir bottom wall 22a, the 2 nd flow rectification plate portion 32b is shown in parallel with the reservoir side wall 22b, and the 1 st flow rectification plate portion 32a and the 2 nd flow rectification plate portion 32b are shown at right angles to each other. However, the 1 st flow rectification plate portion 32a need not be particularly parallel to the reservoir bottom wall 22a as long as it can rectify the coolant, and may be a surface formed by a curved line. The 2 nd flow rectification plate portion 32b need not be parallel to the reservoir side wall 22b, and may be a curved surface. Similarly, the 1 st fairing section 32a and the 2 nd fairing section 32b can have an angle other than a right angle.

Although the 1 st pump 40 is used to pressure-feed the coolant to the magnetic separator 16 in the above embodiment, for example, if the pressure of the coolant supplied from the grinding machine 12 to the magnetic separator 16 is increased by the height difference between the grinding machine 12 and the magnetic separator 16, and the accumulation of sludge such as magnetic powder on the storage tank bottom wall 22a of the magnetic separator 16 can be suppressed, the 1 st pump 40 is not particularly required.

In the above-described embodiment, the 1 st pump 40 is a fluid pump, but may be any fluid pump of a specific type as long as it can pump the coolant at a predetermined pressure by using rotation, reciprocation, or the like.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is also applicable to other embodiments. The above is merely an embodiment, and the present invention can be implemented in various modifications and improvements based on knowledge of those skilled in the art.