Direct injection type rotating shaft and protective cover for grinding wheel

Abstract

The utility model relates to the technical field of grinding device cooling, and discloses a direct injection type rotating shaft for a grinding wheel and a protective cover, the direct injection type rotating shaft for the grinding wheel comprises a first shaft body, a second shaft body and a third shaft body, and the second shaft body is coaxially arranged between the first shaft body and the third shaft body; the third shaft body is used for coaxially mounting a grinding wheel; a flow guide channel filled with cooling liquid is arranged between the first shaft body and the second channel; a spraying opening is formed in the side, close to the grinding wheel, of the diversion channel wall. The direction of the spraying opening is parallel to the axis of the second shaft body, the protective cover comprises a first mounting ring, a second mounting ring and a plugging column, and the first mounting ring and the second mounting ring are detachably connected; a placing area is formed between the first mounting ring and the second mounting ring; the second shaft body is arranged in the placing area; and the plugging column is arranged on the second mounting ring and is matched with the spraying opening in an inserting manner. The grinding device has the effect of conveniently cooling the grinding surface.

Description

Technical Field

[0001] This application relates to the field of cooling technology for grinding devices, and in particular to a direct-injection rotating shaft and protective cover for a grinding wheel. Background Technology

[0002] Internal grinding is a grinding process used to grind the inner surface of a workpiece, which can achieve high roundness, cylindricity, and surface roughness requirements for the inner hole.

[0003] The device for grinding the inner hole of a workpiece mainly includes a grinding wheel and a grinding wheel spindle. One end of the grinding wheel is connected to the power source of the grinding device, and the grinding wheel and the other end of the grinding wheel spindle are coaxially fixedly connected. When it is necessary to grind the inner hole of the workpiece, the grinding wheel is rotated by the grinding wheel spindle, and the grinding wheel contacts the inner hole wall of the workpiece through the outer ring wall of the grinding wheel.

[0004] When the inner hole of a workpiece is deep, the grinding wheel is relatively long. During grinding, the grinding wheel generates a significant amount of heat, necessitating cooling of the grinding wheel, the inner hole wall of the workpiece, and the machined surface. Existing cooling devices typically include cooling pipes installed near the inner hole of the workpiece. Coolant flows through the cooling pipes, and during grinding, coolant is sprayed onto the grinding wheel through the cooling pipes.

[0005] However, when the inner wall of the workpiece is deep, the coolant sprayed from the cooling pipe can generally only reach the area near the opening of the inner hole of the workpiece, and it is difficult to spray the deep part of the inner hole of the workpiece. Utility Model Content

[0006] To facilitate cooling of the grinding surface, this application provides a direct-injection spindle and protective cover for grinding wheels.

[0007] The direct-injection rotary shaft for grinding wheels provided in this application adopts the following technical solution:

[0008] A direct-injection spindle for grinding wheels includes a first spindle body, a second spindle body, and a third spindle body, wherein:

[0009] The second shaft is coaxially disposed between the first shaft and the third shaft;

[0010] The third shaft is used for coaxial mounting of the grinding wheel;

[0011] A guide channel for coolant is provided between the first shaft and the second channel;

[0012] A spray nozzle is provided on the side of the guide channel wall near the grinding wheel;

[0013] The spray nozzles are oriented parallel to the axis of the second shaft.

[0014] Optionally, the distance between the centerline of the spray nozzle and the axis of the second shaft is greater than the distance between the outer wall of the grinding wheel and the centerline of the grinding wheel.

[0015] Optionally, the flow channel includes a first channel and a second channel, wherein:

[0016] The second channel has multiple channels circumferentially arranged around the axis of the second shaft.

[0017] Optionally, the second channel includes a third channel and a fourth channel, wherein:

[0018] The centerline of the third channel intersects the axis of the second shaft at a single point;

[0019] The centerline of the fourth channel is parallel to the axis of the second shaft;

[0020] The third channel connects the first and fourth channels.

[0021] Optionally, the third channel penetrates the outer wall of the second shaft;

[0022] The end seal of the third channel is equipped with a sealing block.

[0023] Optionally, the outer wall of the second shaft is provided with a slope;

[0024] The spray nozzles are located on the inclined surface.

[0025] A protective cover includes a first mounting ring, a second mounting ring, and a sealing post, wherein:

[0026] The first mounting ring and the second mounting ring are detachably connected;

[0027] A placement area is formed between the first mounting ring and the second mounting ring;

[0028] The second shaft is placed inside the placement area;

[0029] The sealing post is placed on the second mounting ring and is inserted into the spray nozzle.

[0030] Optionally, the first mounting ring and the second mounting ring are connected by magnetic attraction.

[0031] Optionally, the end of the sealing post is provided with a guide surface.

[0032] Optionally, an elastic ring is fitted onto the upper part of the sealing post.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. Through the design of the guide channel and spray nozzle, the coolant can be sprayed directly into the depth of the inner hole of the workpiece and form an approximately cone-shaped coolant curtain, thereby increasing the contact area between the coolant and the inner wall of the workpiece and the grinding wheel, enhancing the cooling effect during the grinding process, reducing the temperature of the workpiece and the grinding wheel, and helping to improve the processing quality and the service life of the grinding wheel.

[0035] 2. The matching protective cover can protect the second shaft when the shaft is not in use, preventing impurities from entering the fourth channel, reducing the risk of damage caused by collisions, and further enhancing the protective performance through the design of plastic material and magnetic connection. At the same time, it is easy to disassemble and install, improving the convenience of equipment maintenance.

[0036] 3. The integrated molding design of the first, second, and third shafts, as well as the reasonable layout and construction of the guide channel, spray nozzle, and second channel, make the entire shaft structure compact and stable, effectively transmitting power and achieving precise spraying of coolant. At the same time, it facilitates processing, manufacturing, and assembly, improving the overall performance and reliability of the equipment. Attached Figure Description

[0037] Figure 1 This is a schematic diagram illustrating the relative positions of the first shaft, the second shaft, and the third shaft in an embodiment of this application.

[0038] Figure 2 This is a schematic diagram illustrating the flow channel structure in the embodiments of this application.

[0039] Figure 3 This is a schematic diagram illustrating the positional relationship between the first mounting ring and the second mounting ring in an embodiment of this application.

[0040] Figure 4 This is a schematic diagram illustrating the positional relationship between the sealing post and the second mounting ring in an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. First shaft; 2. Second shaft; 21. Spray nozzle; 22. Inclined surface; 3. Third shaft; 4. Guide channel; 41. First channel; 42. Second channel; 421. Third channel; 422. Fourth channel; 423. Sealing block; 5. Grinding wheel; 6. First mounting ring; 61. Pulley; 7. Second mounting ring; 8. Sealing column; 81. Guide surface. Detailed Implementation

[0043] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0044] This application discloses a direct-injection rotary shaft for grinding wheels.

[0045] A direct-injection spindle for grinding wheels includes a first spindle body 1, a second spindle body 2, and a third spindle body 3. The first spindle body 1, the second spindle body 2, and the third spindle body 3 are integrally formed. The second spindle body 2 is located between the first spindle body 1 and the third spindle body 3, and the first spindle body 1, the second spindle body 2, and the third spindle body 3 are coaxially arranged. A flow guide channel 4 is provided between the first spindle body 1 and the second spindle body 2. A spray nozzle 21 is provided on the side of the wall of the flow guide channel 4 near the grinding wheel 5, and the orientation of the spray nozzle 21 is parallel to the axis of the second spindle body 2.

[0046] The first shaft 1 rotates around its own axis via a power source. The grinding wheel 5 is coaxially mounted on the third shaft 3. The rotation of the first shaft 1 synchronously drives the grinding wheel 5 to rotate. When the grinding wheel 5 grinds the inner hole of the workpiece, coolant is sprayed out from the spray nozzle 21 along the guide channel 4. At this time, the spray nozzle 21 is close to the grinding wheel 5, which facilitates the coolant sprayed from the spray nozzle 21 to be sprayed into the inner hole of the workpiece and to contact the deep inner wall of the workpiece, thereby cooling it and improving the cooling effect. At the same time, when the coolant is sprayed out, the spray nozzle 21 rotates under the drive of the second shaft 2, which facilitates the formation of an approximately cone-shaped coolant curtain from the spray nozzle 21, increasing the contact area between the coolant and the inner wall of the workpiece and the grinding wheel 5, and improving the cooling effect.

[0047] The distance between the centerline of the spray nozzle 21 and the axis of the second shaft 2 is greater than the distance between the outer wall of the grinding wheel 5 and the centerline of the grinding wheel 5. In this way, after the coolant is sprayed out from the spray nozzle 21, the probability of the coolant being sprayed directly onto the side of the grinding wheel 5 near the spray nozzle 21 is reduced, making it easier for the coolant to be sprayed onto the grinding surface for cooling.

[0048] To facilitate a near-cylindrical arrangement of the coolant curtain, allowing the coolant to reach deeper into the workpiece, the centerline of the spray nozzle 21 can be inclined towards the axis of the second shaft 2. When the coolant undergoes centrifugal motion due to the second shaft 2, the angle of inclination of the inclined coolant curtain is minimized, thereby maximizing the distance the coolant travels along the centerline of the workpiece's inner bore.

[0049] To reduce the possibility that the sprayed liquid may not enter the workpiece due to centrifugal motion, the spray nozzle 21 is generally placed as close as possible to the grinding wheel 5, so as to reduce the distance between the spray nozzle 21 and the opening of the inner hole.

[0050] The flow channel 4 includes a first channel 41 and a second channel 42. The first channel 41 is disposed on the first shaft 1, and the second channel 42 is disposed on the second shaft 2. The first shaft 1 and the second shaft 2 are connected. Multiple second channels 42 are arranged circumferentially around the axis of the second shaft 2. In this embodiment, there are six second channels 42. The coolant is sprayed out through multiple second channels 42 to facilitate the formation of a uniform coolant curtain.

[0051] The second channel 42 includes a third channel 421 and a fourth channel 422. The centerline of the third channel 421 intersects the axis of the second shaft 2 at a single point, and the centerline of the fourth channel 422 is parallel to the axis of the second shaft 2. The third channel 421 connects the first channel 41 and the fourth channel 422. In this embodiment, the centerline of the third channel 421 is perpendicular to the axis of the second shaft 2, and the third channel 421 penetrates the outer wall of the second shaft 2, thereby facilitating drilling a hole in the second shaft 2 to form the third channel 421. Subsequently, another hole is drilled to form the fourth channel 422 and the spray nozzle 21.

[0052] The end of the third channel 421 is provided with a sealing block 423. The end of the sealing block 423 near the fourth channel 422 is placed at the junction of the third channel 421 and the fourth channel 422, so as to quickly guide the coolant inside the third channel 421 to the fourth channel 422 and reduce the possibility of turbulence forming in the coolant inside the third channel 421.

[0053] The outer wall of the second shaft 2 is provided with an inclined surface 22, and the spray nozzle 21 is provided on the inclined surface 22. The outer wall of the second shaft 2 near the grinding wheel 5 gradually slopes towards the axis of the second shaft 2 along the direction from the first shaft 1 to the third shaft 3, so as to maximize the opening size of the spray nozzle 21 and the spray cross-section size of the spray nozzle 21, thereby further increasing the spray range of the coolant.

[0054] The implementation principle of a direct-injection spindle for a grinding wheel in this application embodiment is as follows: When the grinding wheel 5 works with the direct-injection spindle, the power source drives the first shaft 1 to rotate around its own axis, which drives the grinding wheel 5, which is coaxially set on the third shaft 3, to rotate synchronously to grind the inner hole of the workpiece; the coolant is sprayed out from the spray nozzle 21 through the guide channel 4 (including the first channel 41 in the first shaft 1 and multiple second channels 42 on the second shaft 2). The spray nozzle 21 is close to the grinding wheel 5 and its orientation is parallel to the axis of the second shaft 2. The coolant forms a cone-shaped liquid curtain that covers the inner hole wall of the workpiece and the grinding wheel 5 to achieve efficient cooling; by optimizing the distance between the center line and the axis of the spray nozzle 21, the tilt angle and the opening design, combined with the uniform distribution of liquid in multiple second channels 42, it is ensured that the coolant penetrates into the inner hole and avoids the influence of centrifugal force, thereby enhancing the grinding cooling effect of the grinding wheel 5 and the workpiece.

[0055] This application also provides a protective cover for use with a direct-injection spindle for a grinding wheel 5. The protective cover includes a first mounting ring 6, a second mounting ring 7, and a sealing post 8. The first mounting ring 6 and the second mounting ring 7 are detachably connected, forming a placement area between them. The sealing post 8 is disposed on the second mounting ring 7 and is inserted into the spray nozzle 21.

[0056] When the second shaft 2 is not in use, the first mounting ring 6 is fitted onto the first shaft 1, and the second mounting ring 7 is fitted onto the second shaft 2. The placement area formed between the first mounting ring 6 and the second mounting ring 7 protects the second shaft 2 through their cooperation. Simultaneously, the sealing column 8 is inserted into the spray nozzle 21, and the cooperation between the second mounting ring 7 and the sealing column 8 reduces the possibility of impurities entering the fourth channel 422. Furthermore, the cooperation between the first mounting ring 6 and the second mounting ring 7 reduces the risk of damage to the second shaft 2 due to impact. Since the first mounting ring 6 and the second mounting ring 7 are made of plastic, the possibility of damage to the second shaft 2 is further reduced.

[0057] In this embodiment, the first mounting ring 6 and the second mounting ring 7 are detachably connected by magnetic attraction. Specifically, the first mounting ring 6 and the second mounting ring 7 are filled with magnetic material, and the magnetic materials of the two attract each other, thereby achieving the connection.

[0058] To facilitate the separation of the first mounting ring 6 and the second mounting ring 7, multiple levers 61 are provided on the outer wall of the first mounting ring 6 to facilitate disassembly by operators.

[0059] The sealing post 8 has a guide surface 81 on the side near the first mounting ring 6, so that the sealing post 8 can quickly enter the fourth channel 422 without damaging it. In this embodiment, the guide surface 81 is designed as an arc surface, which helps the sealing post 8 to be inserted smoothly.

[0060] An elastic ring is fitted around the outer side of the sealing post 8. The elasticity of the ring allows for better sealing of the fourth channel 422. In this embodiment, the elastic ring is made of sponge material, which ensures effective sealing while minimizing damage to the fourth channel 422.

[0061] The implementation principle of a protective cover in this application embodiment is as follows: When the second shaft 2 of the direct-injection rotating shaft of the grinding wheel is not in use, the first mounting ring 6 of the protective cover is sleeved on the first shaft 1, and the second mounting ring 7 is sleeved on the second shaft 2. The placement area formed between the two protects the second shaft 2. At the same time, the sealing column 8 is inserted into the spray nozzle 21. The possibility of impurities entering the fourth channel 422 is reduced by the cooperation of the second mounting ring 7 and the sealing column 8. The first mounting ring 6 and the second mounting ring 7 are made of plastic and are detachably connected by magnetic attraction. The lever 61 on its outer wall is easy to disassemble. The guide surface 81 and the elastic ring on the sealing column 8 ensure that the sealing column 8 can quickly and without damage enter the fourth channel 422 and achieve effective sealing.

[0062] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A direct-injection rotating shaft for grinding wheels, characterized in that: It includes a first shaft, a second shaft, and a third shaft, wherein: The second shaft is coaxially disposed between the first shaft and the third shaft; The third shaft is used for coaxial mounting of the grinding wheel; A guide channel for coolant is provided between the first shaft and the second channel; A spray nozzle is provided on the side of the guide channel wall near the grinding wheel; The spray nozzles are oriented parallel to the axis of the second shaft.

2. The direct-injection rotary shaft for grinding wheels according to claim 1, characterized in that: The distance between the centerline of the spray nozzle and the axis of the second shaft is greater than the distance between the outer wall of the grinding wheel and the centerline of the grinding wheel.

3. The direct-injection rotary shaft for grinding wheels according to claim 1, characterized in that: The flow diversion channel includes a first channel and a second channel, wherein: The second channel has multiple channels circumferentially arranged around the axis of the second shaft.

4. A direct-injection rotary shaft for grinding wheels according to claim 3, characterized in that: The second channel includes the third and fourth channels, among which: The centerline of the third channel intersects the axis of the second shaft at a single point; The centerline of the fourth channel is parallel to the axis of the second shaft; The third channel connects the first and fourth channels.

5. A direct-injection rotary shaft for grinding wheels according to claim 4, characterized in that: The third channel penetrates the outer wall of the second shaft; The end seal of the third channel is equipped with a sealing block.

6. A direct-injection rotary shaft for grinding wheels according to claim 1, characterized in that: The outer wall of the second shaft is provided with a slope; The spray nozzles are located on the inclined surface.

7. A protective cover, used in conjunction with a direct-injection rotary shaft for a grinding wheel as described in any one of claims 1-5, characterized in that: It includes a first mounting ring, a second mounting ring, and a sealing post, wherein: The first mounting ring and the second mounting ring are detachably connected; A placement area is formed between the first mounting ring and the second mounting ring; The second shaft is placed inside the placement area; The sealing post is placed on the second mounting ring and is inserted into the spray nozzle.

8. A protective cover according to claim 7, characterized in that: The first mounting ring and the second mounting ring are connected by magnetic attraction.

9. A protective cover according to claim 7, characterized in that: The end of the sealing column is provided with a guide surface.

10. A protective cover according to claim 7, characterized in that: An elastic ring is fitted on the upper part of the sealing post.

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