Electric grinding tool capable of quickly and automatically clamping chuck

Abstract

The invention discloses an electric grinding tool capable of quickly and automatically clamping a chuck, which comprises a rotating transmission assembly and a rotating main shaft, one end of the rotating main shaft is fixedly connected with the driving end of the rotating transmission assembly, and the other end of the rotating main shaft is detachably connected with a chuck assembly through a pull rod body; the chuck assembly comprises a chuck base and a chuck body arranged in the chuck base in a sliding mode. When the telescopic transmission assembly is started, the telescopic transmission assembly can push the pull rod body to move in the direction away from the rotary driving assembly, so that the clamping part on the chuck body protrudes out of the chuck base and is in a loosened state. The pull rod body is sleeved with a spring, and when the telescopic transmission assembly is closed, the spring is in an extending state and can push the pull rod body to move in the direction close to the rotary driving assembly, so that the clamping part on the chuck body retracts into the chuck base and is in a clamping state. The grinding head can be automatically clamped or loosened so that the grinding head can be rapidly detached and replaced, and the replacement efficiency of the grinding head is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric grinding tools, and in particular to an electric grinding tool capable of quickly and automatically clamping a chuck. Background Art

[0002] Polishing machines, also known as grinders, are often used for mechanical grinding, polishing and waxing. Their working principle is: the driving motor drives the sponge or wool polishing disk installed on the output part of the polishing machine to rotate at high speed, and the polishing disk and the polishing agent work together and rub against the surface to be polished, thereby removing paint pollution, oxide layer and shallow marks.

[0003] During the use of an electric grinder, different grinding heads need to be replaced due to the different degrees of grinding required. The output shaft of the electric grinder and the grinding head are generally fixedly connected by multiple bolts or threaded shafts, which makes installation and disassembly troublesome and inconvenient for quick replacement of the grinding head.

[0004] Therefore, the present invention provides an electric grinding tool capable of quickly and automatically clamping a chuck to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings, the purpose of the present invention is to provide an electric grinding tool that can quickly and automatically clamp a chuck, which can automatically clamp or release the grinding head to achieve rapid disassembly and replacement of the grinding head, thereby improving the replacement efficiency of the grinding head.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: an electric grinding tool capable of quickly and automatically clamping a chuck, comprising a rotary drive assembly, a telescopic transmission assembly and a chuck assembly for clamping a grinding head; The rotary transmission assembly comprises a rotary spindle, one end of which is fixedly connected to the driving end of the rotary drive assembly, and the other end of which is detachably connected to the chuck assembly via a pull rod body; A chuck assembly comprises a chuck seat and a chuck body slidably arranged inside the chuck seat; The telescopic transmission assembly has a telescopic end corresponding to the position of the pull rod body. When activated, it can push the pull rod body to move in a direction away from the rotary drive assembly, so that the clamping portion on the chuck body protrudes from the chuck seat and is in a loose state; A spring is sleeved on the pull rod body. When the telescopic transmission assembly is closed, the spring is in an extended state and can push the pull rod body to move toward the direction close to the rotary drive assembly, so that the clamping part on the chuck body is retracted into the chuck seat and is in a clamped state.

[0007] Furthermore, the rotation drive assembly includes a motor housing and a drive motor located therein, and the drive motor provides a driving force for the rotation of the chuck assembly.

[0008] Furthermore, the telescopic transmission assembly includes a transmission round base and a transmission cylinder. The transmission round base has a cylinder accommodating cavity for the transmission cylinder along its length. The transmission cylinder includes a cylinder piston, a cylinder front cover, and a cylinder push rod horizontally passing through the two. When the cylinder push rod on the transmission cylinder is extended, the chuck body can be pushed out of the chuck seat and the clamping part is in a loose state, which is convenient for inserting and placing the grinding head and realizing the automatic opening of the chuck body.

[0009] Furthermore, the cylinder accommodating cavity includes a distance limiting cavity, and the cylinder piston is located in the distance limiting cavity. The axial length of the distance limiting cavity is the moving stroke of the cylinder push rod, so as to limit the distance that the transmission cylinder extends to push the pull rod body to move, and further limit the distance that the clamping part on the chuck body protrudes from the chuck seat.

[0010] Specifically, the above-mentioned moving stroke is set to 2~3mm.

[0011] Furthermore, the outer wall of the transmission round base is provided with two air pipe joints, and the outer wall is provided with two inner holes connected to the distance limiting cavity at positions corresponding to the air pipe joints. The interior of the transmission cylinder is ventilated through the air pipe joints. Figure 2 When the grinding head needs to be replaced, the air pipe joint is ventilated, the cylinder push rod moves to the right until it contacts the side of the pull rod body, and pushes it to the right, so that the chuck body threaded with it also moves to the right out of the chuck seat. At this time, the clamping part opens and the corresponding grinding head can be inserted; then the air pipe joint is no longer ventilated, and the pressure applied to the pull rod body by the original transmission cylinder disappears. At this time, the spring is not compressed, and gradually resets to the extended state, and pushes the pull rod body to move to the left, and the clamping part of the chuck body enters the chuck seat. At this time, the clamping part is in a clamping state, which can clamp the grinding head. The setting of the spring can also ensure that the grinding head will not be thrown out during the rotation grinding process.

[0012] Furthermore, the cylinder push rod has a hollow structure inside, the rotating main shaft is coaxially arranged with the cylinder push rod, at least part of the rotating main shaft is located inside the cylinder push rod, and one end of the rotating main shaft away from the rotating drive assembly extends out of the cylinder push rod and can be inserted into the pull rod body. The rotating main shaft is fixedly connected inside the cylinder push rod, and when the rotating main shaft rotates, the cylinder push rod will not interfere with its rotation, and similarly, its rotating main shaft will not interfere with the extension and retraction of the cylinder push rod.

[0013] Furthermore, a polygonal groove is provided on one end of the pull rod body near the cylinder push rod, and one end of the rotating main shaft near the pull rod body is set as a polygonal shaft matching the polygonal groove, so that the pull rod body can be driven to rotate when the rotating main shaft rotates. When the cylinder push rod of the transmission cylinder extends to push the pull rod body forward, the polygonal shaft and the polygonal groove can move relative to each other by an end distance, but the polygonal shaft is always located in the polygonal groove and will not leave the polygonal groove, which ensures that the pull rod body can be driven to rotate when the polygonal shaft rotates.

[0014] Furthermore, the pull rod body includes an integrally formed first section and a second section, the tail of the second section is provided with a threaded section, and the pull rod body can be threadedly connected to the connecting portion on the chuck body through the threaded section. The pull rod body and the chuck body are detachably mounted together, on the one hand, the rotation of the pull rod body can drive the chuck body to rotate, so that the grinding head clamped on the chuck body can perform rotational grinding on the workpiece; on the other hand, it is also convenient for the replacement and maintenance of the chuck body, and is convenient for the user to operate.

[0015] It should be noted that the connection between the pull rod body and the chuck body is not limited to being connected only by threads, but may also be connected by a pin shaft, or other known detachable mechanical mechanisms, which will not be elaborated here.

[0016] Furthermore, the chuck seat includes a front shell and a front shaft rotatably arranged in the front shell, the front shaft extends out of the front shell, and the front shaft is provided with a connecting rod accommodating cavity and a chuck accommodating cavity in sequence along its length direction, and the end of the rod body away from the rotating main shaft is connected to the chuck accommodating cavity through a connecting pin, and the spring specifically covers the second section of the rod body located in the rod accommodating cavity. When the rotating main shaft drives the rod body to rotate, the front shaft connected to the rod body through the connecting pin can also rotate, and will not interfere with the rotation of the chuck body.

[0017] The chuck accommodating cavity can allow the chuck body to be fully retracted, and the size of the chuck body's clamping portion structure matches that of the chuck body. Specifically, the chuck accommodating cavity includes a cylindrical section and a truncated cone section, and the truncated cone section facilitates the retraction of the clamping portion on the chuck body while also squeezing its periphery, thereby promoting the clamping portion to clamp the non-grinding end of the grinding head in the clamping portion.

[0018] Furthermore, at least part of the second section of the pull rod body is located in the chuck accommodating cavity, and a through pin moving groove is provided along its length direction for the connecting pin to be inserted and moved. The setting of the pin moving groove can be used to limit the distance that the pull rod body is pushed to move toward the direction close to the rotating main axis under the action of the spring force.

[0019] Beneficial effects of the present invention: In the present invention, the rotary drive assembly, telescopic transmission assembly, rotary transmission assembly, chuck assembly, pull rod body and spring cooperate with each other, the telescopic end of the telescopic transmission assembly extends out and pushes the pull rod body, so that the clamping part on the chuck body moves along the chuck seat and protrudes from the chuck seat. At this time, the clamping part on the chuck body can automatically open under the action of its own elasticity, and the user can insert the grinding head to be replaced into the clamping part; after the grinding head is placed in place, the telescopic transmission assembly is closed, and its telescopic end is reset and no longer exerts on the pull rod body. The spring on the pull rod body is reset and can push the pull rod body to move in the direction close to the rotary drive assembly, so that the clamping part on the chuck body is retracted into the chuck seat. The clamping part shrinks and deforms in the process of being pulled back to the chuck seat, and then clamps the grinding head, thereby realizing rapid disassembly and replacement of the grinding head and effectively improving the replacement efficiency of the grinding head. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an isometric view of the overall structure of an embodiment of the present invention; Figure 2 It is an isometric view of the overall structure of an embodiment of the present invention; Figure 3 for Figure 2 A is a schematic diagram of the enlarged structure of the middle part; Figure 4 It is an isometric view of the overall structure of a chuck assembly according to an embodiment of the present invention; Figure 5 It is an isometric view of the overall structure of the connecting rod body according to one embodiment of the present invention; In the figure: 1. Rotary drive assembly; 11. Drive motor; 12. Motor housing; 2. Telescopic transmission assembly; 21. Transmission round base; 22. Transmission cylinder; 221. Cylinder push rod; 222. Cylinder front cover; 223. Cylinder piston; 23. Cylinder accommodating chamber; 231. Distance limiting chamber; 24. Air pipe joint; 3. Rotary drive assembly; 31. Connecting bearing one; 32. Rotating spindle; 4. Chuck assembly; 41. Chuck body; 42. Connecting part; 43. Clamping part; 5. Chuck seat; 51. Front shell; 52. Front shaft; 53. Pull rod accommodating chamber; 54. Chuck accommodating chamber; 6. Pull rod body; 61. First section; 62. Second section; 63. Pin moving groove; 7. Spring; 8. Connecting bearing two; 9. Connecting bearing three; 10. Connecting pin. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0022] See attached Figures 1 to 5As shown, in this embodiment, an electric grinding tool capable of quickly and automatically clamping a chuck comprises a rotary drive assembly 1, a telescopic transmission assembly 2, and a chuck assembly 4 for clamping a grinding head; The rotary transmission assembly 3 includes a rotary spindle 32, one end of the rotary spindle 32 is fixedly connected to the driving end of the rotary drive assembly 1, and the other end is detachably connected to the chuck assembly 4 through the pull rod body 6; when the rotary drive assembly 1 rotates, the rotary spindle 32 can be driven to rotate, providing driving force for the rotary transmission assembly 3. The detachable connection of the chuck assembly 4 facilitates the user to disassemble and assemble the electric grinding tool, and facilitates the maintenance and replacement of the chuck assembly 4.

[0023] The chuck assembly 4 includes a chuck seat 5 and a chuck body 41 slidably disposed inside the chuck seat 5 ; the replacement and clamping of the grinding head is achieved by loosening and clamping the chuck body 41 .

[0024] The telescopic transmission assembly 2, whose telescopic end corresponds to the position of the pull rod body 6, can push the pull rod body 6 to move in a direction away from the rotary drive assembly 1 when started, so that the clamping portion 43 on the chuck body 41 protrudes from the chuck seat 5 and is in a loose state; The pull rod body 6 is sleeved with a spring 7. When the telescopic transmission assembly 2 is closed, the spring 7 is in an extended state and can push the pull rod body 6 to move toward the direction close to the rotary drive assembly 1, so that the clamping part 43 on the chuck body 41 retracts into the chuck seat 5 and is in a clamped state.

[0025] The chuck body 41 includes a connecting portion 42 and a clamping portion 43. The connecting portion 42 is detachably connected to the pull rod body 6, and the clamping portion 43 is used to clamp the grinding head. It should be noted that the clamping portion 43 is an elastic structure, and a plurality of elastic grooves are provided on it. The telescopic end of the telescopic transmission assembly 2 extends and pushes the pull rod body 6, so that the clamping portion 43 on the chuck body 41 moves along the chuck seat 5 and protrudes from the chuck seat 5. At this time, the clamping portion 43 on the chuck body 41 can automatically open under its own elastic action, and the user can insert the grinding head to be replaced into the clamping portion 43.

[0026] After the grinding head is placed in place, the telescopic transmission assembly 2 is closed, and its telescopic end is reset, and no force is applied to the pull rod body 6. At this time, the spring 7 on the pull rod body 6 is reset, and the pull rod body 6 can be pushed to move toward the direction close to the rotating drive assembly 1, so that the clamping part 43 on the chuck body 41 is retracted into the chuck seat 5. The clamping part 43 shrinks and deforms in the process of being pulled back to the chuck seat 5, thereby clamping the grinding head, and the replacement of the grinding head is completed. The above structure can effectively improve the replacement efficiency of the grinding head.

[0027] The rotary drive assembly 1 comprises a motor housing 12 and a drive motor 11 located therein. The drive motor 11 provides a driving force for the rotation of the chuck assembly 4.

[0028] It should be noted that the drive motor 11 is not limited to it, and it can also be a mechanical mechanism such as a dividing plate that can drive the components to rotate. The drive motor 11 is selected in this application for the purpose of reducing the overall volume of the electric grinding tool to make it easier for users to operate and use.

[0029] The telescopic transmission assembly 2 includes a transmission round base 21 and a transmission cylinder 22. The transmission round base 21 has a cylinder accommodating chamber 23 for the transmission cylinder 22 along its length. The transmission cylinder 22 includes a cylinder piston 223, a cylinder front cover 222, and a cylinder push rod 221 that horizontally penetrates the two. When the cylinder push rod 221 on the transmission cylinder 22 is extended, the chuck body 41 can be pushed out of the chuck seat 5, and the clamping part 43 is in a loose state, which is convenient for inserting and placing the grinding head, and realizes the automatic opening of the chuck body 41.

[0030] In some embodiments, the motor housing 12 is at least partially located in the transmission round base 21, and its outer wall is fixedly connected to the transmission round base 21 by a locking screw, and a click sealing ring is also provided at one end where the motor housing 12 is connected to the transmission round base 21 to prevent water from entering the motor housing 12 and affecting the service life of the drive motor 11 and the transmission cylinder 22.

[0031] In some embodiments, the end of the rotating spindle 32 connected to the rotary drive assembly 1 is also connected to the inner wall of the transmission round base 21 through a connecting bearing 1 31. The connecting bearing 1 31 can support the end of the rotating spindle 32 connected to the drive motor 11 to improve the stability of the overall electric grinding tool.

[0032] The cylinder accommodating chamber 23 includes a distance limiting chamber 231, and the cylinder piston 223 is located in the distance limiting chamber 231. The axial length of the distance limiting chamber 231 is the moving stroke of the cylinder push rod 221, so as to limit the distance that the transmission cylinder 22 extends to push the pull rod body 6 to move, and further limit the distance that the clamping portion 43 on the chuck body 41 protrudes from the chuck seat 5.

[0033] Specifically, the above-mentioned moving stroke is set to 2~3mm.

[0034] The outer wall of the transmission round base 21 is provided with two air pipe joints 24, and the outer wall thereof is provided with two inner holes in communication with the distance limiting cavity 231 at positions corresponding to the air pipe joints 24. The interior of the transmission cylinder 22 is ventilated through the air pipe joints 24. Figure 2When the grinding head needs to be replaced, the air pipe joint 24 is ventilated, and the cylinder push rod 221 moves to the right until it contacts the side of the pull rod body 6, and pushes it to the right, so that the chuck body 41 threadedly connected to it also moves to the right out of the chuck seat 5. At this time, the clamping part 43 is opened and the corresponding grinding head can be inserted; then the air pipe joint 24 is no longer ventilated, and the pressure originally applied to the pull rod body 6 by the transmission cylinder 22 disappears. At this time, the spring 7 is not compressed, and gradually resets to the extended state, and pushes the pull rod body 6 to move to the left, and the clamping part 43 of the chuck body 41 enters the chuck seat 5. At this time, the clamping part 43 is in a clamped state, which can clamp the grinding head. The setting of the spring 7 can also ensure that the grinding head will not be thrown out during the rotation grinding process.

[0035] The cylinder push rod 221 has a hollow structure inside, and the rotating main shaft 32 is coaxially arranged with the cylinder push rod 221. At least part of the rotating main shaft 32 is located inside the cylinder push rod 221, and one end of the rotating main shaft 32 away from the rotating drive assembly 1 extends out of the cylinder push rod 221 and can be inserted into the pull rod body 6. The rotating main shaft 32 is fixedly connected inside the cylinder push rod 221. When the rotating main shaft 32 rotates, the cylinder push rod 221 will not interfere with its rotation. Similarly, the rotating main shaft 32 will not interfere with the extension and retraction of the cylinder push rod 221.

[0036] A polygonal groove is formed on one end of the pull rod body 6 near the cylinder push rod 221, and one end of the rotating main shaft 32 near the pull rod body 6 is set as a polygonal shaft matching the polygonal groove, so that the pull rod body 6 can be driven to rotate when the rotating main shaft 32 rotates. When the cylinder push rod 221 of the transmission cylinder 22 extends to push the pull rod body 6 forward, the polygonal shaft and the polygonal groove can move relative to each other by an end distance, but the polygonal shaft is always located in the polygonal groove and will not leave the polygonal groove, which ensures that the polygonal shaft can drive the pull rod body 6 to rotate when it rotates.

[0037] The rod body 6 includes an integrally formed first section 61 and a second section 62, and a threaded section is provided at the tail of the second section 62, and the rod body 6 can be threadedly connected to the connecting portion 42 on the chuck body 41 through the threaded section. The rod body 6 and the chuck body 41 are detachably mounted together. On the one hand, the rotation of the rod body 6 can drive the chuck body 41 to rotate, so that the grinding head clamped on the chuck body 41 can perform rotational grinding on the workpiece; on the other hand, it is also convenient for replacing and maintaining the chuck body 41, and is convenient for users to operate.

[0038] It should be noted that the connecting portion 42 on the pull rod body 6 and the chuck body 41 is not limited to being connected only by threads, but may also be connected by a pin shaft, or other known detachable mechanical mechanisms, which will not be elaborated herein.

[0039] The chuck seat 5 includes a front shell 51 and a front shaft 52 rotatably disposed in the front shell 51. The front shaft 52 extends out of the front shell 51. The front shaft 52 is provided with a connecting rod accommodating cavity 53 and a chuck accommodating cavity 54 in sequence along its length direction. The end of the rod body 6 away from the rotating main shaft 32 is connected to the chuck accommodating cavity 54 through the connecting pin 10. The spring 7 specifically covers the part of the second section 62 of the rod body 6 located in the rod accommodating cavity 53. When the rotating main shaft 32 drives the rod body 6 to rotate, the front shaft 52 connected to the rod body 6 through the connecting pin 10 can also rotate, and will not interfere with the rotation of the chuck body 41.

[0040] The chuck accommodating cavity 54 can allow the chuck body 41 to be fully retracted, and the size of the chuck accommodating cavity 54 matches the structure of the clamping portion 43 of the chuck body 41. Specifically, the chuck accommodating cavity 54 includes a cylindrical section and a truncated cone section, and the truncated cone section facilitates the retraction of the clamping portion 43 on the chuck body 41, and can also squeeze the outer periphery thereof, thereby promoting the clamping portion 43 to clamp the non-grinding end of the grinding head in the clamping portion 43.

[0041] In some embodiments, the cross section of the pull rod body 6 is T-shaped.

[0042] In some embodiments, one end of the outer wall of the front shaft 52 corresponding to the rod accommodating cavity 53 close to the rotating main shaft 32 is connected to the front shell 51 through a connecting bearing 2 8, and one end of the outer wall of the front shaft 52 corresponding to the clamp accommodating cavity 54 close to the rod accommodating cavity 53 is connected to the front shell 51 through a connecting bearing 3 9. This ensures that the front shell 51 does not interfere with the rotation of the front shaft 52.

[0043] Specifically, the connecting bearing three 9 is two single-row bearings to improve the bearing capacity of the portion of the front shaft 52 corresponding to the chuck accommodating cavity 54, thereby increasing its service life.

[0044] The second section 62 of the pull rod body 6 is at least partially located in the chuck accommodating cavity 54, and is provided with a through pin moving groove 63 along its length direction for the connecting pin 10 to be inserted and moved. The setting of the pin moving groove 63 can be used to limit the distance that the pull rod body 6 moves toward the direction close to the rotating main shaft 32 under the elastic force of the spring 7.

[0045] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric grinding tool capable of quickly and automatically clamping a chuck, characterized in that: It includes a rotary drive assembly, a telescopic transmission assembly, and a chuck assembly for clamping a grinding head; The rotary transmission assembly comprises a rotary spindle, one end of which is fixedly connected to the driving end of the rotary drive assembly, and the other end of which is detachably connected to the chuck assembly via a pull rod body; A chuck assembly comprises a chuck seat and a chuck body slidably arranged inside the chuck seat; The telescopic transmission assembly has a telescopic end corresponding to the position of the pull rod body. When activated, it can push the pull rod body to move in a direction away from the rotary drive assembly, so that the clamping portion on the chuck body protrudes from the chuck seat and is in a loose state; A spring is sleeved on the pull rod body. When the telescopic transmission assembly is closed, the spring is in an extended state and can push the pull rod body to move toward the direction close to the rotary drive assembly, so that the clamping part on the chuck body is retracted into the chuck seat and is in a clamped state.

2. The electric grinding tool capable of quickly and automatically clamping a chuck according to claim 1, characterized in that: The rotary drive assembly includes a motor housing and a drive motor located therein.

3. The electric grinding tool capable of quickly and automatically clamping a chuck according to claim 1, characterized in that: The telescopic transmission assembly includes a transmission round base and a transmission cylinder. A cylinder accommodating chamber for the transmission cylinder is opened inside the transmission round base along its length direction. The transmission cylinder includes a cylinder piston, a cylinder front cover and a cylinder push rod horizontally passing through the two.

4. The electric grinding tool capable of quickly and automatically clamping a chuck according to claim 3, characterized in that: The cylinder accommodating chamber includes a distance limiting chamber, and the cylinder piston is located in the distance limiting chamber.

5. The electric grinding tool capable of quickly and automatically clamping a chuck according to claim 4, characterized in that: The outer wall of the transmission circular base is provided with two air pipe joints, and the positions of the outer wall corresponding to the air pipe joints are provided with two inner holes both connected with the distance limiting cavity.

6. The electric grinding tool capable of quickly and automatically clamping a chuck according to claim 3, characterized in that: The cylinder push rod has a hollow structure inside, the rotating main shaft is coaxially arranged with the cylinder push rod, at least part of the rotating main shaft is located inside the cylinder push rod, and one end of the rotating main shaft away from the rotary drive assembly extends out of the cylinder push rod and can be inserted into the pull rod body.

7. The electric grinding tool capable of quickly and automatically clamping a chuck according to claim 4, characterized in that: A polygonal groove is provided on one end of the pull rod body close to the cylinder push rod, and an end of the rotating main shaft close to the pull rod body is arranged as a polygonal shaft matching the polygonal groove, so that the pull rod body can be driven to rotate when the rotating main shaft rotates.

8. The electric grinding tool capable of quickly and automatically clamping a chuck according to claim 1, characterized in that: The pull rod body comprises an integrally formed first section and a second section, a threaded section is provided at the tail of the second section, and the pull rod body can be threadedly connected to a connecting portion on the chuck body through the threaded section.

9. The electric grinding tool capable of quickly and automatically clamping a chuck according to claim 8, characterized in that: The chuck seat includes a front shell and a front shaft rotatably arranged in the front shell, the front shaft extends out of the front shell, and the front shaft is provided with interconnected pull rod accommodating chambers and chuck accommodating chambers in sequence along its length direction. The end of the pull rod body away from the rotating main axis is connected to the chuck accommodating chamber through a connecting pin, and the spring specifically covers the second section of the pull rod body located in the pull rod accommodating chamber.

10. The electric grinding tool capable of quickly and automatically clamping a chuck according to claim 9, characterized in that: At least part of the second section of the pull rod body is located in the clamp accommodating cavity, and a through pin shaft moving groove is provided along the length direction thereof for the connecting pin shaft to be inserted and moved.

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