Electric grinding machine

Abstract

The utility model belongs to the technical field of polishing, and discloses an electric polisher which comprises a polishing head, an outer shell, a driving motor and a sealing structure, the outer shell comprises a first shell body and a second shell body, the first shell body and the second shell body define a containing cavity, the driving motor is installed in the containing cavity, a through hole is formed in the first shell body, and a through hole is formed in the second shell body. A power shaft of the driving motor extends out of the containing cavity through the penetrating hole, the grinding head is in transmission connection with the end, extending out of the containing cavity, of the power shaft, and the sealing structure comprises a sealing ring and a shaft seal. The driving motor is separated from the outside through the shell, and the shell is sealed through the sealing ring and the shaft seal, so that the waterproof performance of the shell is improved, the driving motor is prevented from being affected with damp, on one hand, the driving motor can be prevented from losing efficacy due to damp, the service life of the driving motor is prolonged, and the production cost is reduced; on the other hand, serious safety accidents caused by the fact that the driving motor is affected with damp can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of grinding, in particular to an electric grinder. Background Art

[0002] In the prior art, metal grinding, cutting, paint removal, putty layer polishing and other production operations are usually completed by electric grinders. The electric grinder includes a drive motor and a grinding head, and the drive motor is used to drive the grinding head to operate.

[0003] For products that need to be wet polished during the operation process, the electric grinder is in a humid environment during operation. On the one hand, the drive motor is prone to failure due to moisture, and frequent replacement of the drive motor will lead to increased production costs and reduced production efficiency. On the other hand, serious safety accidents are prone to occur when the drive motor is in a humid environment.

[0004] Therefore, the above problems need to be solved urgently. Utility Model Content

[0005] The purpose of the utility model is to provide an electric grinder to solve the problems that the drive motor is easily damaged by moisture, the frequent replacement of the drive motor leads to increased production costs and reduced production efficiency, and serious safety accidents are prone to occur when the drive motor is in a humid environment.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] An electric grinder, comprising a grinding head, further comprising:

[0008] The housing comprises a first shell and a second shell, wherein the first shell and the second shell form a receiving cavity;

[0009] A drive motor is installed in the accommodating cavity. The first shell is provided with a through-hole, through which the power shaft of the drive motor extends out of the accommodating cavity. The grinding head is transmission-connected to one end of the power shaft extending out of the accommodating cavity.

[0010] The sealing structure includes a sealing ring and a shaft seal. A accommodating groove is provided on one side of the first shell that is joined to the second shell and / or on one side of the second shell that is joined to the first shell. The sealing ring is accommodated in the accommodating groove and is pressed and confined between the first shell and the second shell. The sealing ring surrounds the outer periphery of the accommodating cavity. The shaft seal is sleeved on the outer periphery of the power shaft and abuts between the inner wall of the first shell with the through hole and the drive motor.

[0011] Preferably, a through hole is provided on the second shell, and the through hole is configured to allow the wire to extend from the accommodating cavity, and the space between the hole wall of the through hole and the wire is filled with sealant.

[0012] Preferably, the electric grinder further includes a heat dissipation structure, which is disposed in the accommodating cavity and configured to dissipate heat for the drive motor.

[0013] Preferably, the heat dissipation structure includes a plurality of semiconductor cooling chips, and the plurality of semiconductor cooling chips are arranged around the axis of the driving motor and around the outer periphery of the driving motor.

[0014] Preferably, a plurality of the semiconductor refrigeration chips are evenly arranged around the axis of the driving motor.

[0015] Preferably, silicone grease is applied between the semiconductor refrigeration chip and the drive motor.

[0016] Preferably, the inner wall of the first shell is provided with a stepped portion, the first shell is sleeved on the outer periphery of the drive motor through the stepped portion, and the stepped portion is sleeved on the outer periphery of the shaft seal.

[0017] Preferably, a transmission groove is provided on the grinding head, and the grinding head is sleeved on the outer periphery of the power shaft through the transmission groove. The side wall of the power shaft is provided with a first plane, and the groove wall of the transmission groove is provided with a second plane, and the first plane is in contact with the second plane.

[0018] Preferably, the first plane extends to the end surface of one end of the power shaft extending out of the accommodating cavity, and the distance between the first plane and the axis of the power shaft along the radial direction of the power shaft gradually decreases from the end of the power shaft extending out of the accommodating cavity to the side of the power shaft close to the drive motor.

[0019] Preferably, the electric grinder further comprises a mounting seat, the housing is fixedly connected to the mounting seat, and the mounting seat is connected to a driving module for driving the mounting seat to move.

[0020] Beneficial effects of the utility model:

[0021] The utility model separates the driving motor from the outside world through the casing, and seals the casing through the sealing ring and the shaft seal, thereby improving the waterproof performance of the casing and preventing the driving motor from being affected by moisture. On the one hand, the utility model can prevent the driving motor from failing due to moisture, thereby increasing the service life of the driving motor, thereby reducing production costs and improving production efficiency. On the other hand, the utility model can also prevent serious safety accidents caused by the driving motor being affected by moisture. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of an electric grinder in an embodiment of the present utility model;

[0023] Figure 2 It is a top view of the electric grinder in the embodiment of the utility model;

[0024] Figure 3 It is along Figure 2 Cross-sectional view along line AA;

[0025] Figure 4 It is along Figure 2 Cross-sectional view along line BB.

[0026] In the picture:

[0027] 1. Grinding head; 11. Transmission groove; 111. Second plane; 12. Eccentric module; 13. Grinding disc; 14. Rubber foot column; 15. Bearing; 2. Housing; 21. First shell; 211. Perforation; 212. Accommodation groove; 213. Step portion; 22. Second shell; 221. Through hole; 23. Accommodation cavity; 3. Drive motor; 31. Power shaft; 311. First plane; 41. Sealing ring; 42. Shaft seal; 5. Heat dissipation structure; 51. Semiconductor refrigeration chip; 6. Mounting seat. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0029] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0032] See also Figures 1 to 4 , this embodiment provides an electric grinder, which includes a grinding head 1. In addition to the grinding head 1, the electric grinder also includes a housing 2, a drive motor 3 and a sealing structure, wherein the housing 2 includes a first shell 21 and a second shell 22, the first shell 21 and the second shell 22 form a accommodating chamber 23, the drive motor 3 is installed in the accommodating chamber 23, the first shell 21 is provided with a through hole 211, the power shaft 31 of the drive motor 3 extends out of the accommodating chamber 23 through the through hole 211, the grinding head 1 is transmission-connected to one end of the power shaft 31 extending out of the accommodating chamber 23, and the sealing structure includes The first shell 21 and the second shell 22 are connected to each other through a groove 212, and the sealing ring 41 is accommodated in the groove 212 and is pressed and confined between the first shell 21 and the second shell 22. The sealing ring 41 surrounds the outer periphery of the accommodating cavity 23, thereby sealing the joint between the first shell 21 and the second shell 22. The shaft seal 42 is sleeved on the outer periphery of the power shaft 31 and abuts between the inner wall of the first shell 21 with a through hole 211 and the drive motor 3, thereby sealing the through hole 211.

[0033] As described above, this embodiment separates the drive motor 3 from the outside world through the housing 2, and seals the housing 2 through the sealing ring 41 and the shaft seal 42, thereby improving the waterproof performance of the housing 2 and preventing the drive motor 3 from getting wet. On the one hand, this embodiment can prevent the drive motor 3 from failing due to moisture, thereby increasing the service life of the drive motor 3, thereby reducing production costs and improving production efficiency. On the other hand, this embodiment can also prevent serious safety accidents caused by the drive motor 3 getting wet.

[0034] It is worth noting that in other optional embodiments, a accommodating groove 212 may be provided on the side of the second shell 22 that is joined to the first shell 21, or a accommodating groove 212 may be provided on both the side of the first shell 21 that is joined to the second shell 22 and the side of the second shell 22 that is joined to the first shell 21. The two accommodating grooves 212 together form a groove body for accommodating the sealing ring 41. This embodiment does not impose any specific restrictions on this.

[0035] In addition, it is worth noting that in this embodiment, the grinding head 1 includes an eccentric module 12, a grinding disc 13 and a rubber foot column 14, wherein the eccentric module 12 is transmission-connected to the power shaft 31, and the grinding disc 13 is connected to the side of the eccentric module 12 away from the power shaft 31 through a bearing 15, the axis of the bearing 15 is parallel to the axis of the power shaft 31, and the axis of the bearing 15 and the axis of the power shaft 31 are spaced apart along the radial direction of the power shaft 31, and the eccentric module 12 is provided with a rubber foot column 14 on both sides of the radial direction of the bearing 15, and the two ends of the rubber foot column 14 are fixedly connected to the grinding disc 13 and the housing 2 respectively. Since the specific working principle and working process of the driving motor 3 driving the grinding head 1 to grind are both existing technologies and are not improvements made by the present invention to the existing technologies, this embodiment will not be described in detail.

[0036] Based on the above, in this embodiment, a transmission groove 11 is provided on the grinding head 1. Specifically, the transmission groove 11 is provided on the eccentric module 12. The grinding head 1 is sleeved on the outer periphery of the power shaft 31 through the transmission groove 11. The side wall of the power shaft 31 is provided with a first plane 311, and the groove wall of the transmission groove 11 is provided with a second plane 111. The first plane 311 is in contact with the second plane 111, thereby ensuring that the power shaft 31 can stably drive the eccentric module 12 to rotate, and then stably drive the grinding disc 13 to complete the relevant grinding operations.

[0037] Furthermore, the first plane 311 extends to the end surface of one end of the power shaft 31 extending out of the accommodating chamber 23, and the distance between the first plane 311 and the axis of the power shaft 31 along the radial direction of the power shaft 31 gradually decreases from the end of the power shaft 31 extending out of the accommodating chamber 23 to the side of the power shaft 31 close to the drive motor 3, that is, in this embodiment, the first plane 311 is tilted, and accordingly, the second plane 111 is also tilted, so as to prevent the grinding head 1 from detaching from the power shaft 31, that is, this embodiment can ensure that the grinding head 1 is always firmly connected to the power shaft 31.

[0038] In addition, in this embodiment, a through hole 221 is provided on the second shell 22, and the through hole 221 is configured to allow a wire to extend from the accommodating cavity 23, so that the drive motor 3 can be electrically connected to a power supply and controller provided in the outside world, wherein the controller can control the current of the drive motor 3, thereby controlling the speed and power of the drive motor 3, thereby ensuring that the grinding operation is carried out accurately.

[0039] As described above, in this embodiment, sealant (not shown) is filled between the hole wall of the through hole 221 and the wire, thereby sealing the through hole 221 to further improve the waterproof performance of the housing 2 and further prevent the drive motor 3 from being affected by moisture.

[0040] Moreover, it should be noted that, in this embodiment, the drive motor 3 adopts a 24V safety voltage motor, which can reduce the noise generated by the drive motor 3 when it is working to improve the production environment. On the other hand, this embodiment can further prevent the occurrence of safety accidents.

[0041] Based on the content mentioned above, since the drive motor 3 is in a sealed environment, the heat dissipation performance of the drive motor 3 will be reduced. For this reason, in this embodiment, the electric grinder also includes a heat dissipation structure 5, which is arranged in the accommodating cavity 23 and is configured to dissipate heat for the drive motor 3, thereby preventing the drive motor 3 from overheating and damage.

[0042] For example, in this embodiment, the heat dissipation structure 5 includes a plurality of semiconductor cooling chips 51, which surround the axis of the drive motor 3 and are arranged around the periphery of the drive motor 3, thereby being able to fully dissipate the heat of the drive motor 3 and further preventing the drive motor 3 from overheating and damage.

[0043] It should be noted that, based on the content mentioned above, a through hole 221 is provided on the second shell 22, and the through hole 221 is configured to allow the wire to extend from the accommodating cavity 23. It can be understood that in this embodiment, more than two through holes 221 are provided on the second shell 22, wherein a part of the through holes 221 is used for allowing the wire electrically connected to the drive motor 3 to extend out of the accommodating cavity 23, and another part of the through holes 221 is used for allowing the wire electrically connected to the semiconductor refrigeration chip 51 to extend out of the accommodating cavity 23.

[0044] Furthermore, a plurality of semiconductor cooling chips 51 are evenly arranged around the axis of the drive motor 3 , thereby being able to more fully dissipate heat for the drive motor 3 and further preventing the drive motor 3 from being damaged by overheating.

[0045] Furthermore, silicone grease (not shown in the figure) is applied between the semiconductor cooling chip 51 and the drive motor 3, thereby further improving the heat dissipation effect and further preventing the drive motor 3 from being damaged by overheating.

[0046] In addition, in this embodiment, the inner wall of the first shell 21 is provided with a stepped portion 213, and the first shell 21 is sleeved on the outer periphery of the drive motor 3 through the stepped portion 213, and the stepped portion 213 is sleeved on the outer periphery of the shaft seal 42, so that the shaft seal 42 can be limited and the sealing effect of the through hole 211 can be further improved, thereby further improving the waterproof performance of the shell 2.

[0047] In addition to the grinding head 1, the outer shell 2, the drive motor 3 and the sealing structure, the electric grinder also includes a mounting base 6. The outer shell 2 is fixedly connected to the mounting base 6. The mounting base 6 is connected to a drive module (not shown in the figure) for driving its movement. The drive module can drive the mounting base 6 to move, thereby facilitating the grinding operation of the grinding head 1.

[0048] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An electric grinder comprising a grinding head (1), characterized in that: The electric grinder also includes: The housing (2) comprises a first shell (21) and a second shell (22), wherein the first shell (21) and the second shell (22) enclose and form a receiving cavity (23); A drive motor (3) is installed in the accommodating cavity (23); a through hole (211) is provided on the first housing (21); a power shaft (31) of the drive motor (3) extends out of the accommodating cavity (23) through the through hole (211); and the grinding head (1) is transmission-connected to one end of the power shaft (31) extending out of the accommodating cavity (23); and A sealing structure comprises a sealing ring (41) and a shaft seal (42); a first housing (21) having a surface joined to the second housing (22) and / or a second housing (22) having a surface joined to the first housing (21) is provided with a receiving groove (212); the sealing ring (41) is received in the receiving groove (212) and is pressed and confined between the first housing (21) and the second housing (22); the sealing ring (41) surrounds the outer periphery of the receiving cavity (23); the shaft seal (42) is sleeved on the outer periphery of the power shaft (31) and abuts between the inner wall of the first housing (21) provided with the through hole (211) and the drive motor (3).

2. The electric grinder according to claim 1, characterized in that: The second shell (22) is provided with a through hole (221), and the through hole (221) is configured to allow a wire to extend from the accommodating cavity (23), and a sealant is filled between the hole wall of the through hole (221) and the wire.

3. The electric grinder according to claim 1, characterized in that: The electric grinder further comprises a heat dissipation structure (5), which is arranged in the accommodating cavity (23) and is configured to dissipate heat for the drive motor (3).

4. The electric grinder according to claim 3, characterized in that: The heat dissipation structure (5) comprises a plurality of semiconductor cooling chips (51), and the plurality of semiconductor cooling chips (51) surround the axis of the drive motor (3) and are arranged on the outer periphery of the drive motor (3).

5. The electric grinder according to claim 4, characterized in that: A plurality of semiconductor refrigeration chips (51) are evenly arranged around the axis of the drive motor (3).

6. The electric grinder according to claim 4, characterized in that Silicone grease is applied between the semiconductor refrigeration chip (51) and the drive motor (3).

7. The electric grinder according to claim 1, characterized in that: The inner wall of the first housing (21) is provided with a stepped portion (213), the first housing (21) is sleeved on the outer periphery of the drive motor (3) through the stepped portion (213), and the stepped portion (213) is sleeved on the outer periphery of the shaft seal (42).

8. The electric grinder according to claim 1, characterized in that: The grinding head (1) is provided with a transmission groove (11), and the grinding head (1) is sleeved on the outer periphery of the power shaft (31) through the transmission groove (11); a first plane (311) is provided on the side wall of the power shaft (31), and a second plane (111) is provided on the groove wall of the transmission groove (11); the first plane (311) is in contact with the second plane (111).

9. The electric grinder according to claim 8, characterized in that: The first plane (311) extends to the end surface of one end of the power shaft (31) extending out of the accommodating cavity (23), and the distance between the first plane (311) and the axis of the power shaft (31) along the radial direction of the power shaft (31) gradually decreases from the end of the power shaft (31) extending out of the accommodating cavity (23) toward the side of the power shaft (31) close to the drive motor (3).

10. The electric grinder according to claim 1, characterized in that: The electric grinder further comprises a mounting seat (6), the housing (2) is fixedly connected to the mounting seat (6), and the mounting seat (6) is connected to a driving module for driving the mounting seat (6) to move.

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