Grinding equipment

Abstract

To provide a grinding device that can effectively utilize grinding wheel accompanying air stream, in generating electric power.SOLUTION: A grinding device 1 grinds a work-piece 8, by rotating a grinding wheel 31 with respect to the work-piece 8. The grinding device 1 comprises an impeller 61 and a power generator 62. The impeller 61 is arranged at a position opposing to an outer peripheral surface 311 of the grinding wheel 31, which is rotated by accompanying air stream A generated on the outer peripheral surface 311 of the grinding wheel 31 by receiving rotation of the impeller 31. The power generator 62 generates electric power by receiving rotation of the impeller 61. Electric power generated by the power generator 62 is utilized for operating the grinding device 1.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a grinding device. [Background technology]

[0002] Grinding machines are used to grind workpieces using a grinding wheel that rotates at high speed. Coolant, which has functions such as cooling, lubrication, and rust prevention, is supplied to the position where the workpiece is being ground by the grinding wheel. During this process, a rotating air flow is generated on the outer surface of the grinding wheel that rotates at high speed. Therefore, measures have been taken to prevent the rotating air flow from interfering with the supply of coolant.

[0003] For example, in the device for utilizing airflow that entrains a grinding wheel described in Patent Document 1, an air jet is sprayed from a nozzle onto the outer peripheral surface of the grinding wheel to block the airflow that entrains the grinding wheel. Specifically, when a workpiece is ground with a grinding wheel, the airflow that entrains the grinding wheel's outer peripheral surface is collected, compressed, and deflected before being sprayed onto the grinding wheel's grinding surface from the nozzle. With this configuration, the airflow entrained by the grinding wheel can be used to generate the necessary compressed air. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-25411 Summary of the Invention [Problem to be solved by the invention]

[0005] Generally, the entrained airflow is blocked by, for example, a shielding plate disposed opposite the outer circumferential surface of the grinding wheel to prevent it from flowing into the grinding position of the workpiece with the grinding wheel. Also, in Patent Document 1, the air jet may use air supplied within the factory. Therefore, further ingenuity is required to effectively utilize the entrained airflow for purposes other than those described in Patent Document 1.

[0006] The present invention has been made in view of the above-mentioned problems, and aims to provide a grinding machine that can effectively utilize the entrained airflow caused by the grinding wheel for generating electricity. [Means for solving the problem]

[0007] One aspect of the present invention is A grinding apparatus that grinds a workpiece by rotating a grinding wheel relative to the workpiece, an impeller disposed at a position facing the outer peripheral surface of the grinding wheel and rotated by a rotating air flow generated on the outer peripheral surface of the grinding wheel in response to the rotation of the grinding wheel; and a generator that generates electricity by receiving rotation of the impeller.

[0008] Another aspect of the present invention is A grinding apparatus that grinds a workpiece by rotating a grinding wheel relative to the workpiece, a hood having an air collection inlet arranged at a position facing the outer peripheral surface of the grinding wheel, and collecting entrained airflow generated on the outer peripheral surface of the grinding wheel in response to rotation of the grinding wheel; an impeller disposed at an air collection outlet of the hood or within the hood, and rotated by the airflow collected by the hood; and a generator that generates electricity by receiving rotation of the impeller. [Effects of the Invention]

[0009] (One embodiment of the grinding device) In the grinding device of the above embodiment, the entrained airflow generated on the outer peripheral surface of the grinding wheel rotates the impeller, and the rotation of the impeller causes the generator to generate electricity. With this configuration, the entrained airflow can be used to generate electricity. Furthermore, by positioning the impeller opposite the outer peripheral surface of the grinding wheel, the flow rate of the entrained airflow can be effectively used to rotate the impeller.

[0010] According to the grinding device of the above aspect, the airflow entrained by the grinding wheel can be effectively utilized for power generation.

[0011] (Another aspect of the grinding device) In the grinding device of the other embodiment, the entrained airflow generated on the outer peripheral surface of the grinding wheel also rotates the impeller, and the rotation of the impeller is received by the generator to generate electricity. With this configuration, the entrained airflow can be used to generate electricity. Furthermore, by locating the impeller at the air collection outlet of the hood or within the hood, the impeller can be easily positioned. Furthermore, by using the hood, the hood can be given the function of blocking the entrained airflow.

[0012] The grinding device of the other aspect described above also makes it possible to effectively utilize the airflow entrained by the grinding wheel for power generation. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is an explanatory view showing a grinding device according to a first embodiment. [Figure 2] FIG. 2 is an explanatory view showing components around the grinding wheel according to the first embodiment. [Figure 3] FIG. 3 is an explanatory diagram showing components around the grinding wheel according to the first embodiment, in a cross section passing through the impeller and the generator. [Figure 4] FIG. 4 is an explanatory diagram showing the periphery of the power system of the grinding device according to the first embodiment. [Figure 5] FIG. 5 is an explanatory view showing components around the grinding wheel according to the second embodiment. [Figure 6] FIG. 6 is an explanatory view showing other components around the grinding wheel according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] A preferred embodiment of the grinding device will be described with reference to the drawings. <Embodiment 1> 1. Basic configuration of grinding device 1 The configuration of the grinding apparatus 1 will be described with reference to Fig. 1. The grinding apparatus 1 grinds the workpiece 8 by rotating a grinding wheel 31 relative to the workpiece 8. The grinding apparatus 1 in this embodiment is a cylindrical grinding machine that grinds the outer peripheral surface of the workpiece 8. The grinding apparatus 1 grinds the outer peripheral surface of the workpiece 8 by rotating the workpiece 8 and the grinding wheel 31, and by moving the grinding wheel 31 relative to the workpiece 8 in a direction intersecting the central axis of the workpiece 8.

[0015] In the grinding apparatus 1 of this embodiment, the axial direction Z is a direction parallel to the horizontal direction and along the central axis of the workpiece 8. The intersecting direction X is a direction parallel to the horizontal direction and intersecting the axial direction Z. In particular, in this embodiment, the intersecting direction X is a direction perpendicular to the axial direction Z.

[0016] The grinding device 1 includes a workpiece support device 2, a wheel head 3, a wheel head feeder 4, a table feeder 5, and a control device 7.

[0017] The workpiece support device 2 is configured to support both ends of the workpiece 8 on the bed 11 and rotate the workpiece 8 at a predetermined rotational speed around the central axis of the workpiece 8. The workpiece support device 2 has a headstock 21 that transmits rotational force from a rotational drive source 23 such as a motor to one end of the workpiece 8, and a tailstock 22 that rotatably supports the other end of the workpiece 8. The headstock 21 may be provided with a center member that supports the center of the end of the workpiece 8, or may be provided with a chuck mechanism that grips the end of the workpiece 8. The tailstock 22 is provided with a center member that supports the center of the end of the workpiece 8.

[0018] The wheel head 3 is mounted with a shaft 32 on which a grinding wheel 31 is rotatably supported, and a rotary drive source 33 such as a motor connected to the shaft 32. The grinding wheel 31 is driven to rotate by the rotary drive source 33 such as a motor. In this embodiment, the central axis of the grinding wheel 31 is parallel to the central axis of the workpiece 8. The grinding wheel 31 is formed as a disk-shaped member, and the outer peripheral surface 311 of the grinding wheel 31 grinds the outer peripheral surface of the workpiece 8.

[0019] The wheel head feeder 4 is configured to relatively move the grinding wheel 31 in a transverse direction X that intersects the central axis of the workpiece 8. The wheel head feeder 4 determines the feed speed of the grinding wheel 31 to the outer peripheral surface of the workpiece 8, and determines the amount of cutting into the workpiece 8 by the grinding wheel 31 when grinding the workpiece 8. The rotation direction of the workpiece 8 and the rotation direction K of the grinding wheel 31 may be the same direction or may be opposite directions.

[0020] The wheel head feeding device 4 is configured using a ball screw 42 and a linear guide 43 for moving the wheel head 3 in the transverse direction X, a rotary drive source 44 for rotating the ball screw 42, etc. The wheel head 3 moves in the transverse direction X via the ball screw 42 and the linear guide 43. The wheel head feeding device 4 is configured on the bed 11 of the grinding machine 1. Note that a linear motor may be used instead of the ball screw 42.

[0021] The table feed device 5 is configured to relatively move the grinding wheel 31 in the axial direction Z parallel to the central axis of the workpiece 8. The table feed device 5 is configured to change the position of the workpiece 8 in the axial direction Z facing the outer peripheral surface 311 of the grinding wheel 31.

[0022] The table feed device 5 is configured using a table 51 on which the headstock 21 and tailstock 22 are placed, a ball screw 52 and guide unit 53 for moving the table 51 in the axial direction Z, a rotary drive source 54 for rotating the ball screw 52, ​​etc. As the table 51 moves in the axial direction Z via the ball screw 52 and guide unit 53, the workpiece 8 supported by the headstock 21 and tailstock 22 moves in the axial direction Z. The table feed device 5 is configured on the bed 11 of the grinding machine 1. Note that a linear motor may be used instead of the ball screw 52.

[0023] The operations of the workpiece support device 2, the wheel head 3, the wheel head feeder 4, and the table feeder 5 are controlled by a control device 7. The control device 7 synchronously controls the operations of the workpiece support device 2, the wheel head feeder 4, and the table feeder 5, and is capable of plunge grinding, in which the workpiece 8 is ground while the grinding wheel 31 is moved relatively in the cross direction X, and traverse grinding, in which the workpiece 8 is ground while the grinding wheel 31 is moved relatively in the axial direction Z.

[0024] 2. Other configurations of the grinding device 1 Other configurations of the grinding apparatus 1 will be described with reference to Fig. 2 to Fig. 4. As shown in Fig. 2, the grinding apparatus 1 includes an impeller 61, a generator 62, a grinding wheel cover 34, a coolant nozzle 63, a shielding plate 64, and the like, located around the grinding wheel 31. The impeller 61 is disposed in a position facing the outer peripheral surface 311 of the grinding wheel 31, and is configured to rotate by entrained airflow A that is generated on the outer peripheral surface 311 of the grinding wheel 31 as a result of the rotation of the grinding wheel 31. The impeller 61 has a central shaft 611 and a plurality of blades 612 arranged radially around the central shaft 611.

[0025] When the entrained airflow A comes into contact with the blades 612, the impeller 61 rotates about the central shaft 611 to convert the entrained airflow A into rotational force. The central axis of the central shaft 611 of the impeller 61 in this embodiment is parallel to the central axis of the grinding wheel 31. Depending on the shape of the impeller 61, the central axis of the central shaft 611 of the impeller 61 may be perpendicular to the central axis of the grinding wheel 31 or may be inclined relative to the central axis of the grinding wheel 31.

[0026] As shown in FIGS. 2 and 3, the generator 62 is configured to generate electricity by receiving rotation of the impeller 61. The generator 62 has a stator in which a coil is arranged, and a rotor in which a magnet is arranged. In this embodiment, the central shaft 611 of the impeller 61 is attached (directly connected) to a rotation input portion 621 of the rotor of the generator 62. When the rotor rotates in response to the rotation of the impeller 61, a current is generated in the coil of the stator. FIG. 2 conceptually illustrates the generator 62. Note that the central shaft 611 of the impeller 61 may be connected to the rotation input portion 621 of the generator 62 via a power transmission member.

[0027] 3, the impeller 61 and the generator 62 are arranged to be movable in the radial direction of the grinding wheel 31 relative to the grinding wheel cover 34. More specifically, a bolt 623 attached to a flange portion 622 of the generator 62 is inserted into an elongated hole 343 provided in the grinding wheel cover 34, extending in the radial direction of the grinding wheel 31. By moving the generator 62 along the longitudinal direction of the elongated hole 343, the opposing position of the impeller 61 in the radial direction of the grinding wheel 31 can be adjusted.

[0028] As shown in FIGS. 2 and 3 , a grinding wheel cover 34 is disposed on the outer peripheral surface 311 and side surfaces of the grinding wheel 31 to protect the grinding wheel 31 from damage and to prevent the coolant C from scattering. The grinding wheel cover 34 is box-shaped and is open on the side facing the workpiece 8. The grinding wheel cover 34 is provided with a door 342 that allows the grinding wheel 31 to be attached and detached to the shaft portion 32 of the wheel head 3. The grinding wheel cover 34 is attached to the shaft portion 32 of the wheel head 3. The grinding wheel cover 34 is formed in a shape that covers the outer peripheral surface 311 and part of the side surfaces of the grinding wheel 31. The grinding wheel cover 34 covers approximately half of the outer peripheral surface 311 and side surfaces of the grinding wheel 31. The grinding wheel cover 34 is formed in a shape with corners. A space S is formed between the corners of the grinding wheel cover 34 and the grinding wheel 31, in which an impeller 61 can be placed.

[0029] 2, the impeller 61 of this embodiment is disposed in a space S at a corner of the grinding wheel cover 34, with the blade portion 612 of the impeller 61 facing the outer circumferential surface 311 of the grinding wheel 31, inside the grinding wheel cover 34. This configuration allows the space S inside the grinding wheel cover 34 to be effectively used for disposing the impeller 61. Meanwhile, the generator 62 is disposed outside or external to the grinding wheel cover 34. This configuration prevents the coolant C that splashes inside the grinding wheel cover 34 from coming into contact with the generator 62, thereby protecting the generator 62 from the coolant C.

[0030] The impeller 61 is disposed in a position facing the outer peripheral surface 311 of the grinding wheel 31. The generator 62 of this embodiment is attached to the outside of the grinding wheel cover 34 with a rotation input portion 621 connected to the central shaft portion 611 of the impeller 61.

[0031] A coolant nozzle 63 is disposed in a position facing the outer peripheral surface 311 of the grinding wheel 31, supplying coolant C to the position where the workpiece 8 is ground by the grinding wheel 31. A discharge tip 631 of the coolant nozzle 63 may be disposed in a position facing the outer peripheral surface 311 of the grinding wheel 31. The coolant nozzle 63 is configured to discharge coolant C sent from a coolant supply device. The discharge tip 631 of the coolant nozzle 63 in this embodiment is directed toward the position where the workpiece 8 is ground by the grinding wheel 31. The discharge of coolant C from the discharge tip 631 of the coolant nozzle 63 is performed by the control device 7 operating the coolant supply device.

[0032] A shielding plate 64 is disposed opposite the outer peripheral surface 311 of the grinding wheel 31 to prevent the entrained air flow A from flowing into the workpiece 8. In this embodiment, the shielding plate 64 is attached to the grinding wheel cover 34. The tip of the shielding plate 64 is disposed close to the outer peripheral surface 311 of the grinding wheel 31. Most of the entrained air flow A collides with the shielding plate 64, is deflected, and flows out laterally from the outer peripheral surface 311 of the grinding wheel 31. The air layer caused by the entrained air flow A is reduced downstream of the position of the shielding plate 64 in the rotation direction K of the grinding wheel 31.

[0033] The impeller 61, the generator 62, the grinding wheel cover 34, the coolant nozzle 63, the shielding plate 64, etc. are attached to the wheel head 3. The impeller 61, the generator 62, the grinding wheel cover 34, the coolant nozzle 63, the shielding plate 64, etc. move in accordance with the movement of the grinding wheel 31 in the cross direction X and the axial direction Z.

[0034] As shown in Fig. 4, the power generated by the generator 62 is used to operate the grinding apparatus 1. The amount of power generated by the generator 62 is small, and most of the equipment constituting the grinding apparatus 1 requires commercial power generated by a power company. The grinding apparatus 1 uses a stable power supply device 71 to stably supply power to the grinding apparatus 1. The stable power supply device 71 mixes the private power generated by the generator 62 with commercial power.

[0035] The workpiece support device 2, wheel head 3, wheel head feeder 4, table feeder 5, control device 7, etc., which utilize the stable power supply device 71 of the grinding machine 1, operate on AC or DC power supplied from the stable power supply device 71. The workpiece support device 2, wheel head 3, wheel head feeder 4, and table feeder 5 each have rotary drive sources 23, 33, 44, 54, etc. that use AC or DC power. The control device 7 has an AC-DC converter that converts AC power to DC power, and can output signals using DC power.

[0036] The stable power supply device 71 of the grinding device 1 of this embodiment mainly uses commercial power, which is 200V three-phase AC power. However, the stable power supply device 71 may also use AC power of 100V or the like. AC power is mainly used for the power lines L1 of the rotary drive sources 23, 33, 44, and 54. DC current is mainly used for the signal lines L2 between the control device 7 and the rotary drive sources 23, 33, 44, 54, etc. In FIG. 3, the power lines L1 are indicated by solid arrows, and the signal lines L2 are indicated by dashed arrows.

[0037] The power output from the generator 62 differs in frequency, voltage, etc. from the power used in the stable power supply device 71 of the grinding device 1. Therefore, the power from the generator 62 is supplied to the stable power supply device 71 of the grinding device 1 after the frequency, voltage, etc. are converted via the frequency converter 72, voltage converter 73, etc. Note that the power from the generator 62 may also be supplied directly to the control device 7 after the frequency, voltage, etc. are converted via the frequency converter 72, voltage converter 73, etc.

[0038] 3. The relative positions of the workpiece 8, the impeller 61, the coolant nozzle 63, and the shielding plate 64 around the grinding wheel 31 The relative positions of the components around the grinding wheel 31 will be described with reference to Figure 2. Opposite the outer peripheral surface 311 of the grinding wheel 31, the impeller 61, the shielding plate 64, the coolant nozzle 63, and the workpiece 8 are arranged in this order from upstream to downstream in the rotation direction K of the grinding wheel 31. With this configuration, the entrained airflow A can be used to generate electricity, and the entrained airflow A can be prevented from interfering with the supply of coolant C to the grinding position.

[0039] The grinding wheel 31 is disposed horizontally opposite the workpiece 8. In other words, the workpiece 8 faces one position in the cross direction X that faces the outer peripheral surface 311 of the grinding wheel 31. The impeller 61 is disposed at the other position in the cross direction X that is opposite to the one position in the cross direction X where the workpiece 8 is disposed relative to the grinding wheel 31.

[0040] The discharge tip 631 of the coolant nozzle 63 is located diagonally above the position where the outer circumferential surface 311 of the grinding wheel 31 faces the workpiece 8, and is located upstream in the rotation direction K of the grinding wheel 31 relative to the workpiece 8. The discharge tip 631 of the coolant nozzle 63 is directed downstream in the rotation direction K of the grinding wheel 31.

[0041] The tip of the shielding plate 64 is disposed in a position facing the outer peripheral surface 311 of the grinding wheel 31 from above or diagonally above. The tip of the shielding plate 64 is disposed downstream of the impeller 61 in the rotation direction K of the grinding wheel 31, and upstream of the coolant nozzle 63 in the rotation direction K of the grinding wheel 31.

[0042] 4. Grinding and power generation operations in the grinding device 1 The grinding and power generation operations of the grinding apparatus 1 will be described with reference to Fig. 2. In the grinding apparatus 1, when the workpiece 8 is ground by the grinding wheel 31, the grinding wheel 31 rotates at a high speed, and the workpiece 8 also rotates at a slower peripheral speed than the grinding wheel 31. At this time, a rotating airflow A is generated on the outer circumferential surface 311 of the grinding wheel 31 according to the rotational speed of the grinding wheel 31. The rotating airflow A is generated so as to circle around the outer periphery of the grinding wheel 31 in the same direction as the rotation direction K of the grinding wheel 31.

[0043] The entrained airflow A generated on the outer peripheral surface 311 of the grinding wheel 31 downstream in the rotation direction K relative to the workpiece 8 flows into the grinding wheel cover 34 and collides with the blades 612 of the impeller 61 disposed inside the grinding wheel cover 34, causing the impeller 61 to rotate. When the impeller 61 rotates, the generator 62 generates electricity, and the generated power is used by the grinding device 1.

[0044] Furthermore, when the entrained air flow A collides with the shielding plate 64 after colliding with the impeller 61, the momentum of the entrained air flow A weakens, and the flow rate of the entrained air flow A on the downstream side of the shielding plate 64 in the rotation direction K decreases. The shielding plate 64 prevents the entrained air flow A from interfering with the supply of the coolant C discharged from the discharge tip 631 of the coolant nozzle 63 to the grinding position of the workpiece 8.

[0045] 5. Effects In the grinding apparatus 1 of this embodiment, the entrained airflow A generated on the outer peripheral surface 311 of the grinding wheel 31 rotates the impeller 61, and the rotation of the impeller 61 causes the generator 62 to generate electricity. With this configuration, the entrained airflow A can be used to generate electricity. Furthermore, by arranging the impeller 61 at a position facing the outer peripheral surface 311 of the grinding wheel 31, the flow velocity of the entrained airflow A can be effectively used to rotate the impeller 61.

[0046] According to the grinding device 1 of this embodiment, the entrained airflow A caused by the grinding wheel 31 can be effectively utilized for power generation.

[0047] <Embodiment 2> In this embodiment, an impeller 61 and a generator 62 are arranged in a grinding machine 1 having a hood 65, and will be described with reference to FIG. The grinding apparatus 1 of this embodiment includes a hood 65 that collects the entrained airflow A that occurs on the outer peripheral surface 311 of the grinding wheel 31 as the grinding wheel 31 rotates. The hood 65 is formed in a tubular shape with a flow path that allows gas to pass through. The air collection inlet 651 of the hood 65 is disposed in a position facing the outer peripheral surface 311 of the grinding wheel 31. The air collection inlet 651 of the hood 65 opens in a direction that faces the rotation direction K of the grinding wheel 31. In other words, the air collection inlet 651 of the hood 65 is disposed in a state that runs counter to the flow of the entrained airflow A that entrains the entrained airflow A that entrains the outer peripheral surface 311 of the grinding wheel 31, in order to collect the entrained airflow A.

[0048] The impeller 61 in this embodiment is disposed at the air collection outlet 652 of the hood 65, and is configured to rotate by the airflow collected by the hood 65. The impeller 61 may also be disposed inside the hood 65. The generator 62 is attached to the outside of the hood 65, and is configured to generate electricity by receiving the rotation of the impeller 61. A rotation input portion 621 of the generator 62 is connected to the central shaft portion 611 of the impeller 61.

[0049] In the grinding apparatus 1 of this embodiment as well, the grinding wheel cover 34 is disposed in a position facing the outer peripheral surface 311 of the grinding wheel 31. The air collection inlet 651 of the hood 65 is disposed inside the grinding wheel cover 34, and the hood 65 and the grinding wheel cover 34 are integrated together. The air collection inlet 651 of the hood 65 penetrates the grinding wheel cover 34 from the outside to the inside and is disposed in a position facing the outer peripheral surface 311 of the grinding wheel 31. The air collection outlet 652 of the hood 65, the impeller 61, and the generator 62 are disposed outside the grinding wheel cover 34.

[0050] In this embodiment, too, the coolant nozzle 63 and the shielding plate 64 are disposed at appropriate positions facing the outer peripheral surface 311 of the grinding wheel 31. In this embodiment, the air collection inlet 651 of the hood 65, the shielding plate 64, the coolant nozzle 63, and the workpiece 8 are disposed in this order facing the outer peripheral surface 311 of the grinding wheel 31, from upstream to downstream in the rotation direction K of the grinding wheel 31. With this configuration, the entrained airflow A is guided by the hood 65 to the impeller 61 to be used for power generation, and the entrained airflow A does not interfere with the supply of coolant C to the grinding position.

[0051] In this embodiment, too, entrained airflow A is generated so as to swirl around the outer periphery of the grinding wheel 31 in the same direction as the rotation direction K of the grinding wheel 31. The entrained airflow A generated on the outer periphery 311 of the grinding wheel 31 downstream in the rotation direction K relative to the workpiece 8 flows into the grinding wheel cover 34 and further flows into the hood 65 from the air collection inlet 651. The airflow flowing inside the hood 65 collides with the blades 612 of the impeller 61 disposed at the air collection outlet 652 of the hood 65, causing the impeller 61 to rotate. When the impeller 61 rotates, the generator 62 generates electricity, and the generated power is used for the grinding apparatus 1.

[0052] Furthermore, when the entrained airflow A on the outer peripheral surface 311 of the grinding wheel 31 downstream of the air collection inlet 651 of the hood 65 collides with the shielding plate 64, the momentum of the entrained airflow A weakens, and the flow rate of the entrained airflow A on the downstream side of the shielding plate 64 in the rotation direction K decreases. The shielding plate 64 prevents the entrained airflow A from interfering with the supply of the coolant C discharged from the discharge tip 631 of the coolant nozzle 63 to the grinding position of the workpiece 8.

[0053] In the grinding apparatus 1 of this embodiment, the hood 65 can guide the entrained airflow A to the position where the impeller 61 is disposed. The hood 65 can be formed into a shape according to the position where the impeller 61 is disposed, which increases the degree of freedom in the positions where the impeller 61 and the generator 62 are disposed relative to the position where the grinding wheel 31 is disposed. Also, by providing the hood 65 with the function of blocking the entrained airflow A, it may be possible to eliminate the need for the shielding plate 64.

[0054] 6, the hood 65 may be formed with multiple air collection inlets 651. The multiple air collection inlets 651 may be arranged side by side on the upstream and downstream sides of the rotation direction K of the grinding wheel 31. In this case, the entrained airflow A flowing into the hood 65 from the multiple air collection inlets 651 is guided to the impeller 61. This makes it easier to collect the entrained airflow A inside the hood 65.

[0055] Other configurations, actions, and effects of the grinding device 1 of this embodiment are the same as those of embodiment 1. Also, in this embodiment, components denoted by the same reference numerals as those in embodiment 1 are the same as those in embodiment 1.

[0056] <Other embodiments> When the grinding wheel 31 is formed of a wheel provided with diamond, CBN (cubic boron nitride), or the like, the outer diameter of the grinding wheel 31 does not change significantly. On the other hand, when the grinding wheel 31 is formed of a general WA grinding wheel, GC grinding wheel, or the like, the outer diameter of the grinding wheel 31 changes slightly depending on the time of use. In the latter case, when the impeller 61 is disposed opposite the outer peripheral surface 311 of the grinding wheel 31, the impeller 61 may be made movable in the radial direction of the grinding wheel 31. In this case, the impeller 61 may be attached to a bracket whose position in the radial direction of the grinding wheel 31 can be changed. Furthermore, the impeller 61 may be attached to the grinding wheel cover 34 or the hood 65 in a state where its position in the radial direction of the grinding wheel 31 can be changed.

[0057] The present invention is not limited to the respective embodiments, and various other embodiments can be configured without departing from the spirit of the present invention. The present invention also includes various modifications, modifications within the scope of equivalents, etc. [Explanation of symbols]

[0058] 1 Grinding equipment 31 Grinding Wheel 311 Outer surface 34 Grindstone cover 61 Impeller 62 Generator 63 Coolant nozzle 64 Shield plate 65 Food 7 Control Device 8 Workpiece K Rotation direction A. Entrained airflow C. Coolant

Claims

1. A grinding apparatus that grinds a workpiece by rotating a grinding wheel relative to the workpiece, an impeller disposed at a position facing the outer peripheral surface of the grinding wheel and rotated by a rotating air flow generated on the outer peripheral surface of the grinding wheel in response to the rotation of the grinding wheel; a generator that generates electricity by receiving rotation of the impeller.

2. Further, a grinding wheel cover is provided, which is disposed in a position facing the outer peripheral surface of the grinding wheel. The grinding device according to claim 1 , wherein the impeller is disposed within the grinding wheel cover, and the generator is disposed outside the grinding wheel cover.

3. a coolant nozzle disposed at a position facing the outer peripheral surface of the grinding wheel and supplying coolant to a position where the workpiece is ground by the grinding wheel; a shielding plate disposed opposite the outer peripheral surface of the grinding wheel to prevent the entrained air flow from flowing into the workpiece; 3. The grinding device according to claim 1, wherein the impeller, the shielding plate, the coolant nozzle, and the workpiece are arranged in this order from upstream to downstream in the rotation direction of the grinding wheel at positions facing the outer peripheral surface of the grinding wheel.

4. A grinding apparatus that grinds a workpiece by rotating a grinding wheel relative to the workpiece, a hood having an air collection inlet arranged at a position facing the outer peripheral surface of the grinding wheel, and collecting entrained airflow generated on the outer peripheral surface of the grinding wheel in response to rotation of the grinding wheel; an impeller disposed at an air collection outlet of the hood or within the hood, and rotated by the airflow collected by the hood; a generator that generates electricity by receiving rotation of the impeller.

5. Further, a grinding wheel cover is provided, which is disposed in a position facing the outer peripheral surface of the grinding wheel.

5. The grinding device according to claim 4, wherein the air collection inlet of the hood is disposed inside the grindstone cover, and the hood and the grindstone cover are integrated.

6. a coolant nozzle disposed at a position facing the outer peripheral surface of the grinding wheel and supplying coolant to a position where the workpiece is ground by the grinding wheel; a shielding plate disposed opposite the outer peripheral surface of the grinding wheel to prevent the entrained air flow from flowing into the workpiece; 6. The grinding device according to claim 4, wherein the hood, the shielding plate, the coolant nozzle, and the workpiece are arranged in this order from upstream to downstream in the rotation direction of the grinding wheel at positions facing the outer peripheral surface of the grinding wheel.

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