Grinding wheel center water outlet cooling structure

Abstract

The invention discloses a grinding wheel center water outlet cooling structure, and relates to the technical field of grinding wheel cooling, the grinding wheel center water outlet cooling structure comprises a rack, a driving motor and a grinding wheel fixedly connected with a driving shaft of the driving motor are arranged above the rack, and the grinding wheel is provided with a mounting seat fixedly connected with the driving shaft of the driving motor in the axial direction of the grinding wheel; a cooling loop corresponding to the side wall of the inner circle of the grinding wheel is arranged in the mounting base, and a water conveying pipeline communicated with the cooling loop is arranged on the side, away from the driving motor, of the grinding wheel. When the grinding wheel rotates, centrifugal force generated by rotation of the grinding wheel enables the cooling water to diffuse into the grinding wheel through air holes among grinding materials of the grinding wheel, and the cooling water is sprayed out from the edge position of the grinding wheel. Grinding scraps filled in gaps between grinding materials of the grinding wheel are flushed and removed, meanwhile, the grinding wheel and a workpiece are cooled through cooling water, and the possibility that focal spots appear when the workpiece is machined is reduced.

Description

Technical Field

[0001] This application relates to the technical field of grinding wheel cooling, and in particular to a cooling structure with water output from the center of the grinding wheel. Background Art

[0002] A grinding wheel is a consolidated abrasive tool in which ordinary abrasives are solidified into a certain shape (mostly circular with a through hole in the center) by a binder and have a certain strength. It generally consists of abrasives, a binder, and pores, and these three parts are often referred to as the three elements of a consolidated abrasive tool. According to different classifications of binders, common ones include ceramic (binder) grinding wheels, resin (binder) grinding wheels, and rubber (binder) grinding wheels.

[0003] The grinding wheel is the most widely used and most widely applied type of abrasive tool. When in use, it rotates at a high speed and can be used for rough grinding, semi-finishing, and finishing of the outer circle, inner circle, plane, and various profiles of metal or non-metal workpieces, as well as grooving and cutting. Currently, when using a grinding wheel to grind a workpiece, during the process of the grinding wheel grinding the workpiece at a high speed, a large amount of heat is generated due to friction. When cooling the grinding wheel, cooling water is usually conveyed from the side direction of the grinding wheel to cool the grinding wheel.

[0004] Regarding the above related technologies, the inventor believes that during the process of the grinding wheel grinding the workpiece at a high speed, the grinding position between the grinding wheel and the workpiece cannot be fully contacted with the cooling water to cool the grinding wheel, which will cause burn marks to appear on the workpiece during the processing, affecting the processing and use of the workpiece. Summary of the Invention

[0005] The purpose of this application is to provide a cooling structure with water output from the center of the grinding wheel to improve the problem that during the process of the grinding wheel grinding the workpiece at a high speed, the grinding position between the grinding wheel and the workpiece cannot be fully contacted with the cooling water to cool the grinding wheel, which will cause burn marks to appear on the workpiece during the processing, affecting the processing and use of the workpiece.

[0006] The cooling structure with water output from the center of the grinding wheel provided by this application adopts the following technical solution:

[0007] The cooling structure with water output from the center of the grinding wheel includes a frame, a driving motor is arranged above the frame, and a grinding wheel fixedly connected to the driving shaft of the driving motor. An installation seat fixedly connected to the driving shaft of the driving motor is arranged along the axial direction of the grinding wheel. A cooling circuit corresponding to the inner circular side wall of the grinding wheel is arranged in the installation seat, and a water delivery pipeline communicated with the cooling circuit is arranged on the side of the grinding wheel away from the driving motor.

[0008] By adopting the above technical solution, the coating on the inner circumferential sidewall of the grinding wheel is removed, and the grinding wheel is fixed to the mounting seat with bolts. Cooling water is conveyed into the cooling circuit of the mounting seat through a water pipeline. The cooling circuit corresponds to the inner circumferential sidewall of the grinding wheel. When the driving shaft of the driving motor drives the grinding wheel to rotate, the centrifugal force generated by the rotation of the grinding wheel causes the cooling water to diffuse into the grinding wheel through the pores between the abrasives of the grinding wheel and spray out from the edge position of the grinding wheel. When the grinding wheel grinds the workpiece, the grinding wheel is cooled and its temperature is reduced, enabling the grinding contact surface between the grinding wheel and the workpiece to come into full contact with the cooling water for cooling and temperature reduction, thereby reducing the possibility of the workpiece having scorch marks during processing. At the same time, the debris filled in the gaps between the abrasives of the grinding wheel is flushed and removed, minimizing the impact on the use of the grinding wheel caused by a large amount of debris filling the working surface of the grinding wheel.

[0009] Optionally, a clamping seat one is arranged on the mounting seat extending along the axial direction of the grinding wheel. The outer circumferential sidewall of the clamping seat one fits with the inner circumferential sidewall of the grinding wheel. An installation column corresponding to the water pipeline is arranged on the side of the clamping seat one away from the mounting seat. The cooling circuit includes a water through-hole opened along the axial direction of the installation column. A water through-groove communicated with the water through-hole is opened on the sidewall of the installation column along the radial direction. The water through-groove corresponds to the inner circumferential sidewall of the grinding wheel.

[0010] By adopting the above technical solution, the grinding wheel is fixed by the clamping seat one fitting with the inner circumferential sidewall of the grinding wheel. The water pipeline is communicated with the water through-hole and the water through-groove of the installation column. Cooling water is conveyed to the inner circumferential sidewall of the grinding wheel through the water through-groove, enabling the cooling water to diffuse to the whole grinding wheel through the pores between the grinding wheels for temperature reduction. When the grinding wheel rotates, the cooling water can flow out from the outer circumferential sidewall of the grinding wheel, and the contact surface can be directly cooled during the grinding process of the grinding wheel on the workpiece, reducing the possibility of the workpiece having scorch marks during grinding.

[0011] Optionally, a fixed chuck is arranged at one end of the installation column away from the clamping seat one. A clamping seat two corresponding to the inner circumferential sidewall of the grinding wheel extends on the side of the fixed chuck facing the grinding wheel. Central holes fitting with the sidewall of the installation column are opened on the fixed chuck and the clamping seat two. The installation column passes through the central holes to make the fixed chuck fit with the side of the grinding wheel away from the clamping seat one.

[0012] By adopting the above technical solution, the fixed chuck is fixed on the side of the grinding wheel away from the mounting seat with bolts. The grinding wheel is fixed between the mounting seat and the fixed chuck. The grinding wheel is supported by the clamping seat one on the mounting seat and the clamping seat two on the fixed chuck, reducing the impact on the grinding of the workpiece caused by the grinding wheel shaking during rotation.

[0013] Optionally, the outer diameter of the installation column is smaller than the inner diameter of the grinding wheel. A cooling cavity communicated with the water through-groove is formed between the installation column located between the mounting seat and the fixed chuck and the grinding wheel.

[0014] By adopting the above technical solution, the outer diameter of the mounting post is smaller than the inner diameter of the grinding wheel. The cooling cavity between the mounting post and the grinding wheel expands the contact area between the cooling water and the inner sidewall of the grinding wheel, enabling the cooling water to enter the pores of the grinding wheel more quickly when the grinding wheel rotates. Under the centrifugal force of the grinding wheel, the cooling water seeps out from the circumferential sidewall of the grinding wheel to cool the grinding wheel and the workpiece.

[0015] Optionally, a plurality of positioning holes communicating with each other are provided in the mounting seat and the fixed chuck. The positioning holes penetrate through the first chuck and the second chuck and correspond to the cooling cavity. A set screw for fixing the mounting seat and the fixed chuck is threadedly connected in the positioning holes.

[0016] By adopting the above technical solution, the set screw is threadedly connected to the plurality of positioning holes communicating with each other provided in the mounting seat and the fixed chuck to fix the mounting seat and the fixed chuck. The positioning holes penetrate through the first chuck and the second chuck and correspond to the cooling cavity, enabling the set screw to connect and fix the mounting seat and the fixed chuck through the cooling cavity to fix the grinding wheel and avoid damaging the grinding wheel body.

[0017] Optionally, a plurality of water through holes and water through grooves are provided along the circumferential sidewall of the mounting post. A communication groove communicating with the water through holes is provided at one end of the mounting post away from the grinding wheel. An end cover covering the communication groove and connected to the water pipeline is provided at one end of the mounting post.

[0018] By adopting the above technical solution, a plurality of water through holes and water through grooves are provided along the circumferential sidewall of the mounting post, enabling the cooling water conveyed in the water pipeline to flow through the communication groove to the plurality of water through holes and water through grooves, thereby quickly filling the cooling cavity, accelerating the speed of the cooling water filling the grinding wheel along the pores of the grinding wheel, and accelerating the cooling speed of the grinding wheel.

[0019] Optionally, a plurality of water diversion grooves corresponding to the inner sidewall of the grinding wheel and communicating with the cooling cavity are provided on the outer circumferential sidewalls of the first chuck and the second chuck. The axial height of the first chuck is greater than the axial height of the second chuck. A diversion groove communicating with the water diversion groove is provided on the circumferential sidewall of the first chuck.

[0020] By adopting the above technical solution, water diversion grooves are provided on the outer circumferential sidewalls of the first chuck and the second chuck to expand the contact area between the cooling water and the inner sidewall of the grinding wheel, further accelerating the speed of the cooling water flushing into the pores of the grinding wheel and increasing the cooling speed of the grinding wheel; at the same time, the friction force between the water diversion grooves and the inner sidewall of the grinding wheel is increased to better fix the grinding wheel; the diversion groove provided on the circumferential sidewall of the first chuck and communicating with the water diversion groove accelerates the speed of the cooling water flushing into the grinding wheel.

[0021] Optionally, the water pipeline includes a rotary joint axially threadedly connected to the central axis of the end cover. A water pipeline is connected in communication to the end of the rotary joint away from the mounting post.

[0022] By adopting the above technical solution, the fixed part of the rotary joint is threadedly connected to the end cover, and the rotating part of the rotary joint is connected to the water pipe, so as to avoid the water pipe from being entangled and twisted when the grinding wheel rotates, so that the cooling water cannot be delivered to the air holes of the grinding wheel in time to cool the grinding wheel.

[0023] Optionally, the frame is provided with a cover shell corresponding to the grinding wheel, the top of the cover shell is provided with a fixing hole corresponding to the water pipe, the side wall of the cover shell is provided with a fixing seat, and the fixing seat is provided with a slot that is clamped with the water pipe.

[0024] By adopting the above technical solution, a cover corresponding to the grinding wheel is installed on the frame, and part of the cooling water thrown out by the grinding wheel is blocked by the cover to prevent the cooling water from splashing around and affecting other equipment. The water pipe is fixed through the slot of the fixed seat installed on the cover to prevent the movement of the water pipe from affecting the grinding of the workpiece.

[0025] Optionally, a water retaining edge corresponding to the grinding wheel is extended from one side of the cover shell away from the frame.

[0026] By adopting the above technical solution, a water retaining edge corresponding to the grinding wheel is extended on the side of the cover shell away from the frame, and the cooling water splashed by the grinding wheel is further blocked by the water retaining edge, thereby further reducing the splash range of the cooling water.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Remove the coating on the inner side wall of the grinding wheel, and convey the cooling water into the cooling circuit of the mounting seat through the water pipeline. When the grinding wheel rotates, the cooling water diffuses into the grinding wheel through the pores between the abrasives of the grinding wheel through the centrifugal force generated by the rotation of the grinding wheel, and sprays out from the edge of the grinding wheel. When the grinding wheel grinds the workpiece, the grinding wheel is cooled down, so that the grinding contact surface between the grinding wheel and the workpiece can be fully contacted with the cooling water for cooling down, and the possibility of scorch spots on the workpiece during processing is avoided as much as possible; at the same time, the debris filled in the gaps between the abrasives of the grinding wheel is washed and removed, and the use of the grinding wheel is avoided as much as possible after the working surface of the grinding wheel is filled with a large amount of debris.

[0029] 2. The outer circle size of the mounting column is smaller than the inner circle size of the grinding wheel. The contact area between the cooling water and the inner circle side wall of the grinding wheel is expanded through the cooling cavity between the mounting column and the grinding wheel, so that the cooling water can enter the pores of the grinding wheel faster when the grinding wheel rotates. Under the centrifugal force of the grinding wheel, the cooling water seeps out from the circumferential side wall of the grinding wheel to cool the grinding wheel and the workpiece;

[0030] 3. Open water diversion grooves on the outer circumferential side walls of the first clamping seat and the second clamping seat to expand the contact area between the cooling water and the inner circumferential side wall of the grinding wheel, further accelerate the speed of the cooling water flushing into the pores of the grinding wheel, and improve the cooling speed of the grinding wheel; at the same time, increase the friction force between the water diversion groove and the inner circumferential side wall of the grinding wheel to better fix the grinding wheel; the diversion groove opened on the circumferential side wall of the first clamping seat and communicating with the water diversion groove accelerates the speed of the cooling water flushing into the grinding wheel. Brief Description of the Drawings

[0031] Figure 1 is the overall schematic diagram of the cooling structure with water flowing out from the center of the grinding wheel;

[0032] Figure 2 is the partial cross-sectional view of the cooling structure with water flowing out from the center of the grinding wheel;

[0033] Figure 3 is the exploded view of the cooling structure with water flowing out from the center of the grinding wheel.

[0034] In the figure, 1, frame; 11, drive motor; 2, grinding wheel; 3, mounting seat; 31, first clamping seat; 311, water diversion groove; 312, diversion groove; 32, mounting column; 321, communication groove; 33, end cover; 34, mounting hole; 4, cooling circuit; 41, water through hole; 42, water through groove; 43, cooling cavity; 5, water pipeline; 51, rotary joint; 52, water pipe; 6, fixed chuck; 61, second clamping seat; 62, center hole; 63, positioning hole; 64, set screw; 7, housing; 71, fixing hole; 72, fixing seat; 721, clamping groove; 73, water retaining edge. Detailed Description of the Preferred Embodiments

[0035] The following is a further detailed description of the present application in conjunction with the attached Figure 1 - attached Figure 3 drawings.

[0036] The cooling structure with water flowing out from the center of the grinding wheel, referring to Figure 1 and Figure 2, including a frame 1, a driving motor 11 electrically connected to a power supply is installed above the frame 1, and a grinding wheel 2 fixedly connected to the driving shaft of the driving motor 11. Along the axial direction of the grinding wheel 2, there is a metal mounting seat 3 fixedly engaged with the driving shaft of the driving motor 11. In the mounting seat 3, there is a cooling circuit 4 corresponding to the inner circumferential side wall of the grinding wheel 2. On the side of the grinding wheel 2 away from the driving motor 11, there is a water delivery pipeline 5 communicating with the cooling circuit 4. The cooling water is conveyed into the cooling circuit 4 of the mounting seat 3 through the water delivery pipeline 5. The driving shaft of the driving motor 11 drives the mounting seat 3 to drive the grinding wheel 2 to rotate. Due to the centrifugal force generated by the rotation of the grinding wheel 2, the cooling water diffuses into the grinding wheel 2 through the pores between the abrasives of the grinding wheel 2 and sprays out from the edge position of the grinding wheel 2, flushing and removing the grinding debris filled in the gaps between the abrasives of the grinding wheel 2. At the same time, the grinding wheel 2 and the workpiece are cooled by the cooling water, reducing the possibility of the workpiece having burn marks during processing.

[0037] Refer to Figure 2 and Figure 3 , along the axial direction of the grinding wheel 2 on the mounting seat 3, there is an integrally formed metal clamping seat 31 extending. The outer circumferential side wall of the clamping seat 31 is in contact with the inner circumferential side wall of the grinding wheel 2. On the side of the clamping seat 31 away from the mounting seat 3, there is an integrally formed metal mounting post 32. An installation hole 34 engaged with the driving shaft of the driving motor 11 is opened in the axial direction of the central axes of the mounting post 32, the clamping seat 31, and the mounting seat 3, facilitating the fixed connection with the driving shaft of the driving motor 11; the mounting post 32 corresponds to the water delivery pipeline 5. The cooling circuit 4 includes a water passing hole 41 opened along the axial direction of the mounting post 32. A water passing groove 42 communicating with the water passing hole 41 is opened in the side wall of the mounting post 32 in the radial direction. The water passing groove 42 corresponds to the inner circumferential side wall of the grinding wheel 2; at one end of the mounting post away from the clamping seat 31, there is a metal fixing chuck 6. On the side of the fixing chuck 6 facing the grinding wheel 2, there is a metal clamping seat 61 extending corresponding to the inner circumferential side wall of the grinding wheel 2. A central hole 62 fitting the side wall of the mounting post 32 is opened in the fixing chuck 6 and the clamping seat 61. The mounting post 32 passes through the central hole 62 to make the fixing chuck 6 in contact with the side of the grinding wheel 2 away from the clamping seat 31, further fixing the grinding wheel 2.

[0038] Refer to Figure 2 and Figure 3, the outer diameter of the mounting post 32 is smaller than the inner diameter of the grinding wheel 2. A cooling cavity 43 communicating with the water through-channel 42 is formed between the mounting post 32 located between the mounting seat 3 and the fixed chuck 6 and the grinding wheel 2, expanding the contact area between the cooling water and the inner sidewall of the grinding wheel 2, so that when the grinding wheel 2 rotates, the cooling water can enter the pores of the grinding wheel 2 faster to cool the grinding wheel 2; A number of through holes 63 communicating with each other are provided in the mounting seat 3 and the fixed chuck 6. The through holes 63 penetrate through the first clamping seat 31 and the second clamping seat 61 and correspond to the cooling cavity 43. A set screw 64 for fixing the mounting seat 3 and the fixed chuck 6 is threadedly connected in the through holes 63, so that the set screw 64 connects and fixes the mounting seat 3 and the fixed chuck 6 through the cooling cavity 43 to fix the grinding wheel 2 and avoid damaging the grinding wheel 2 itself; A number of water through holes 41 and water through-channels 42 are arranged at intervals along the circumferential sidewall of the mounting post 32. A communication groove 321 communicating with the water through holes 41 is provided at one end of the mounting post 32 away from the grinding wheel 2. An end cover 33 covering the communication groove 321 and connected to the water delivery pipeline 5 is installed at one end of the mounting post 32 with bolts, so that the cooling water conveyed in the water delivery pipeline 5 can flow through the communication groove 321 to a number of water through holes 41 and water through-channels 42, enabling the cooling cavity 43 to be quickly filled with cooling water.

[0039] Refer to Figure 2 and Figure 3 , a number of water guiding grooves 311 corresponding to the inner sidewall of the grinding wheel 2 and communicating with the cooling cavity 43 are provided on the outer sidewalls of the first clamping seat 31 and the second clamping seat 61, expanding the contact area between the cooling water and the inner sidewall of the grinding wheel 2 and further accelerating the speed of the cooling water flushing into the pores of the grinding wheel 2. The axial height of the first clamping seat 31 is greater than the axial height of the second clamping seat 61. A diversion groove 312 communicating with the water guiding grooves 311 is provided on the circumferential sidewall of the first clamping seat 31 to accelerate the speed of the cooling water flushing into the grinding wheel 2.

[0040] Refer to Figure 1 and Figure 2, the water delivery pipeline 5 includes a rotary joint 51 axially threadedly connected to the central axis of the end cover 33. The rotary joint 51 is divided into a fixed part and a rotating part threadedly connected to the end cover 33. The rotating part at one end of the rotary joint 51 away from the mounting column 32 is hermetically communicated with the water delivery pipe 52, avoiding the possibility that the water delivery pipe 52 is wound and twisted when the grinding wheel 2 rotates, and preventing the cooling water from not being sent into the air holes of the grinding wheel 2 in time to cool the grinding wheel 2; A housing 7 corresponding to the grinding wheel 2 is installed on the frame 1. The housing 7 blocks part of the cooling water thrown out by the grinding wheel 2. A fixing hole 71 corresponding to the water delivery pipe 52 is opened at the top of the housing 7. A metal fixing seat 72 is fixed to the side wall of the housing 7 with screws. The fixing seat 72 is provided with a clamping groove 721 that is clamped with the water delivery pipe 52 to fix the water delivery pipe 52; A water blocking edge 73 corresponding to the grinding wheel 2 is extended on one side of the housing 7 away from the frame 1. The water blocking edge 73 further blocks the cooling water splashed by the grinding wheel 2 and further reduces the splashing range of the cooling water.

[0041] The implementation principle of the embodiment of the present application is as follows:

[0042] In actual operation, the mounting seat 3 is connected to the grinding wheel 2 through the first clamping seat 31, and the fixed chuck 6 is connected to the grinding wheel 2 through the second clamping seat 61. The mounting seat 3, the grinding wheel 2, and the fixed chuck 6 are connected and fixed by threadedly connecting the set bolts 64 to the positioning holes 63 of the mounting seat 3 and the fixed chuck 6. The cooling water is filled into the communication groove 321, the water through hole 41, and the water through groove 42 of the mounting column 32 through the water delivery pipe 52 of the water delivery pipeline 5, and the cooling cavity 43 between the inner circular side wall of the grinding wheel 2 and the mounting column 32 is filled with water. When the driving motor 11 drives the mounting seat 3 to drive the grinding wheel 2 to rotate, the centrifugal force generated by the rotation of the grinding wheel 2 causes the cooling water to diffuse into the grinding wheel 2 through the air holes between the abrasives of the grinding wheel 2 and spray out from the edge position of the grinding wheel 2, washing and removing the grinding debris filled in the gaps between the abrasives of the grinding wheel 2. At the same time, the grinding wheel 2 and the workpiece are cooled by the cooling water, reducing the possibility of the workpiece having scorch marks during processing.

[0043] The embodiments of the present specific implementation manner are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A grinding wheel center water cooling structure, comprising a frame (1), a driving motor (11) being arranged above the frame (1), and a grinding wheel (2) fixedly connected to a driving shaft of the driving motor (11), characterized in that: The grinding wheel (2) is provided with a mounting seat (3) fixedly connected to the drive shaft of the drive motor (11) along its axial direction; a cooling circuit (4) corresponding to the inner circular side wall of the grinding wheel (2) is provided in the mounting seat (3); and a water supply pipeline (5) communicating with the cooling circuit (4) is provided on a side of the grinding wheel (2) away from the drive motor (11).

2. The grinding wheel center water cooling structure according to claim 1, characterized in that: The mounting seat (3) is provided with a clamping seat (31) extending along the axial direction of the grinding wheel (2); the outer circular side wall of the clamping seat (31) is in contact with the inner circular side wall of the grinding wheel (2); a mounting column (32) corresponding to the water supply pipeline (5) is provided on the side of the clamping seat (31) away from the mounting seat (3); the cooling circuit (4) includes a water hole (41) provided along the axial direction of the mounting column (32); a water groove (42) communicating with the water hole (41) is provided on the side wall of the mounting column (32) along the radial direction; the water groove (42) corresponds to the inner circular side wall of the grinding wheel (2).

3. The grinding wheel center water cooling structure according to claim 2 is characterized in that: A fixed chuck (6) is arranged at one end of the mounting column (32) away from the first clamping seat (31); a second clamping seat (61) corresponding to the inner circular side wall of the grinding wheel (2) is arranged on the side of the fixed chuck (6) extending toward the grinding wheel (2); a center hole (62) is formed in the fixed chuck (6) and the second clamping seat (61) to fit with the side wall of the mounting column (32); the mounting column (32) passes through the center hole (62) so that the fixed chuck (6) fits with the side of the grinding wheel (2) away from the first clamping seat (31).

4. The grinding wheel center water cooling structure according to claim 3 is characterized in that: The outer circle size of the mounting column (32) is smaller than the inner circle size of the grinding wheel (2), and a cooling cavity (43) connected to the water groove (42) is formed between the mounting column (32) located between the mounting seat (3) and the fixed chuck (6) and the grinding wheel (2).

5. The grinding wheel center water cooling structure according to claim 4, characterized in that: The mounting seat (3) and the fixed chuck (6) are provided with a plurality of interconnected positioning holes (63), the positioning holes (63) being arranged through the first chuck seat (31) and the second chuck seat (61) and corresponding to the cooling cavity (43), and the positioning holes (63) are threadedly connected with fixing bolts (64) for fixing the mounting seat (3) and the fixed chuck (6).

6. The grinding wheel center water cooling structure according to claim 4, characterized in that: A plurality of water holes (41) and water grooves (42) are arranged at intervals along the circumferential side wall of the mounting column (32); a connecting groove (321) communicating with the water hole (41) is provided at one end of the mounting column (32) away from the grinding wheel (2); and an end cover (33) covering the connecting groove (321) and connected to the water delivery pipeline (5) is provided at one end of the mounting column (32).

7. The grinding wheel center water cooling structure according to claim 6, characterized in that: The outer circumferential side walls of the first and second clamping seats (31) (61) are provided with a plurality of water diversion grooves (311) corresponding to the inner circumferential side walls of the grinding wheel (2) and communicating with the cooling cavity (43); the axial height of the first clamping seat (31) is greater than the axial height of the second clamping seat (61); and the circumferential side walls of the first clamping seat (31) are provided with guide grooves (312) communicating with the water diversion grooves (311).

8. The grinding wheel center water cooling structure according to claim 6, characterized in that: The water delivery pipeline (5) comprises a rotary joint (51) axially threadedly connected to the central axis of the end cover (33); one end of the rotary joint (51) away from the mounting column (32) is connected to a water delivery pipe (52).

9. The grinding wheel center water cooling structure according to claim 8, characterized in that: The frame (1) is provided with a cover shell (7) corresponding to the grinding wheel (2); a fixing hole (71) corresponding to the water pipe (52) is provided on the top of the cover shell (7); a fixing seat (72) is provided on the side wall of the cover shell (7); and a clamping groove (721) clamped with the water pipe (52) is provided on the fixing seat (72).

10. The grinding wheel center water cooling structure according to claim 9, characterized in that: A water retaining edge (73) corresponding to the grinding wheel (2) is extended from one side of the cover shell (7) away from the frame (1).

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