CN113714929A

CN113714929A - Improved grinding host

Info

Publication number: CN113714929A
Application number: CN202110947422.XA
Authority: CN
Inventors: 林智敏; 洪培英; 魏随吉; 林榕栋; 黄嘉鸿
Original assignee: Quanzhou Haiende Electromechanical Technology Development Co ltd
Current assignee: Quanzhou Haiende Electromechanical Technology Development Co ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2021-11-30
Anticipated expiration: 2040-09-27
Also published as: CN112276793A; CN112276793B; CN113798994A; CN113798994B; WO2022062299A1; CN113714929B

Abstract

The invention discloses an improved grinding host, which comprises a seat body, a main shaft, a grinding head and a driving motor, wherein the main shaft is arranged on the seat body; the main shaft is rotatably arranged on the seat body, the driving motor is fixedly arranged on the seat body to drive the main shaft to rotate, and the grinding head is arranged at the lower end of the main shaft; wherein the seat body is formed by machining after casting; the lower end of the seat body is provided with a limiting mounting hole, the lower end of the seat body is provided with a limiting fixing plate, and the limiting fixing plate is fixedly connected with the limiting mounting hole through a fixing piece; and a limiting through hole which is communicated up and down is formed in the limiting fixing plate, and a limiting rod is arranged in the limiting through hole in a sliding manner up and down. Compared with the prior art, the seat body is integrally cast, so that the integral stability is improved, and the processing quality is ensured.

Description

Improved grinding host

The patent application of the invention is a divisional application of Chinese patent application No. 202011029948.1, the application No. of the original application is 202011029948.1, the application date is 09 and 27 days 2020, and the name of the invention is a grinding host with good stability.

Technical Field

The invention relates to the field of polishing equipment, in particular to an improved polishing host.

Background

The grinding and polishing of stone or plate material is to grind the surface to be processed continuously by a grinding head to make the surface to be processed reach certain smoothness. Most of the existing stone grinding and polishing devices utilize a belt conveying mechanism to convey stones, a swing beam is arranged above the belt conveying mechanism, sliding rail seats fixed at two ends of the swing beam are slidably mounted on a rack, and when the stones are machined, the swing beam swings back and forth to drive a grinding head on the swing beam to polish the surfaces of the stones.

The base body of the traditional grinding host machine is manufactured in a mode of splicing steel plates and locking by screws or welding. The processed seat body has poor stability. Easily deformed and vibrated, thereby affecting the sanding effect.

The main shaft of the traditional main grinding machine needs to penetrate through the middle of the swing beam, so that the structural strength of the swing beam is influenced, and the grinding and polishing precision of the whole main grinding machine is reduced.

In view of the above, the applicant has made an intensive study on the above-mentioned defects in the prior art, and has made this invention.

Disclosure of Invention

The invention mainly aims to provide an improved grinding main machine which has the characteristic of good stability of a seat body and can reduce vibration deviation when a main shaft and a grinding head are ground.

In order to achieve the above purpose, the solution of the invention is:

an improved grinding host comprises a seat body, a main shaft, a grinding head and a driving motor; the main shaft is rotatably arranged on the seat body, the driving motor is fixedly arranged on the seat body to drive the main shaft to rotate, and the grinding head is arranged at the lower end of the main shaft; wherein, the seat body is formed by machining after casting.

Further, the seat body is formed by integrally molding cast steel.

Further, the base body comprises a supporting frame, a central cylinder and a motor mounting seat which are integrally connected, the central cylinder is formed in the middle of the supporting frame, and the main shaft is rotatably connected in the central cylinder; the motor mounting seat is connected to the upper end of the supporting frame and is suspended outside the supporting frame; an installation binding surface is formed on the outer side wall of the supporting frame below the motor installation seat, and a supporting clamping groove is formed at the upper end of the installation binding surface.

Further, a mounting rib plate is formed on the upper edge of the motor mounting seat, and a plurality of motor mounting holes are processed on the mounting rib plate; the driving motor spindle is downwards arranged on the mounting rib plate.

Further, the spindle comprises an outer shaft cylinder and an inner shaft, the outer shaft cylinder is rotatably connected with the central cylinder, a spline sleeve is arranged in the outer shaft cylinder, an inner spline is formed on the inner wall of the spline sleeve, an outer spline is arranged outside the inner shaft, and the inner shaft is connected with the spline sleeve through the spline and can slide along the axial direction of the outer shaft cylinder; the upper end of the outer shaft cylinder is connected with a driven wheel, and the driven wheel is connected with a driving wheel on an output shaft of the driving motor through a transmission part.

Furthermore, an upper support bearing used for supporting the outer shaft cylinder is arranged at the upper part of the central cylinder; the driven wheel is propped against the upper end of the inner ring of the upper supporting bearing from top to bottom.

Furthermore, the driven wheel and the driving wheel are belt pulleys, and the transmission part is a plurality of transmission belts connected to the driving wheel and the driven wheel.

Further, an installation through groove penetrating through the outer shaft barrel is formed in the outer shaft barrel, a driving key is installed in the installation through groove, and the driving key extends out of the installation through groove and is connected with the spline sleeve and the driven wheel.

Furthermore, the upper part of the inner shaft is connected with a lifting device for driving the inner shaft to lift; the lifting device comprises a driving seat, a lifting oil cylinder and an oil cylinder mounting seat; the driving seat is rotatably connected with the inner shaft, the oil cylinder mounting seat is arranged on the seat body, the lifting oil cylinder is fixedly connected with the oil cylinder mounting seat, and the lower end of a piston rod of the lifting oil cylinder is fixedly connected with the driving seat.

Further, a four-corner contact bearing connected with the driving seat is arranged at the upper end of the inner shaft, an upper cover plate is arranged above the four-corner contact bearing, a spacer sleeve sleeved on the inner shaft is arranged below the four-corner contact bearing, and a lower cover plate is arranged below the spacer sleeve.

Further, a pipeline mounting plate is arranged between the oil cylinder mounting seat and the seat body, a through hole is formed in the middle of the pipeline mounting plate, and a first flange higher than the upper surface of the pipeline mounting plate is formed at the edge of the through hole; the lower cover plate is downwards provided with a second flange; the first flange has an outer diameter smaller than an inner diameter of the second flange.

Furthermore, an electromagnetic valve for driving and controlling the lifting oil cylinder is arranged in the supporting frame and is connected with the lifting oil cylinder through a pipeline.

Further, a lubricating shaft sleeve is arranged at the lower end of the inner cavity of the outer shaft cylinder, and the inner wall of the lubricating shaft sleeve is in abutting contact with the outer wall of the inner shaft.

Further, a lower supporting bearing used for supporting the outer shaft cylinder is arranged at the lower part of the central cylinder, and a sealing end cover is arranged below the lower supporting bearing; a lubricating oil channel communicated with an installation cavity of a bearing seat of the lower support bearing is arranged in the central cylinder; an oil supply device is arranged in the supporting frame and communicated with the lubricating oil channel through a pipeline.

Further, a water passing channel is formed in the center of the inner shaft, an extension pipe is connected to the upper end of the water passing channel, a water injection sleeve is arranged at the upper end of the oil cylinder mounting seat, a water injection pipe is arranged in the middle of the water injection sleeve, the water injection pipe extends into the extension pipe from top to bottom, and the outer wall of the water injection pipe is not in contact with the inner wall of the extension pipe.

Furthermore, the lower end of the seat body is provided with a limiting mounting hole; the lower end of the seat body is provided with a limiting fixing plate, and the limiting fixing plate is fixedly connected with the limiting mounting hole through a fixing piece; and a limiting through hole which is communicated up and down is formed in the limiting fixing plate, and a limiting rod is arranged in the limiting through hole in a sliding manner up and down.

Furthermore, a reinforcing partition plate is integrally arranged in the middle of the supporting frame.

After adopting the structure, the improved grinding main machine provided by the invention at least has the following beneficial effects:

the seat body is formed by machining after being integrally cast and formed, the overall stability is superior to that of the traditional seat body formed by splicing or welding plates, and the stability of the device can be better ensured when the grinding head is used for grinding, so that the processing quality of the processed surface is improved.

Secondly, an installation binding surface and a support clamping groove are formed outside the support frame of the motor installation seat and on the outer side wall of the support frame below the motor installation seat, so that the seat body is fixedly installed on the side surface of the swing beam in a binding mode through the installation binding surface, and the motor installation seat is located above the swing beam; so avoided punching on the pendulum beam and be used for installing the main shaft, the weight of driving motor and main shaft distributes more balancedly on the pendulum beam moreover for the host computer of polishing is more steady on the pendulum beam.

And a main shaft with an outer shaft cylinder and an inner shaft is arranged, the outer shaft cylinder is rotatably connected with the base body, a driven wheel is connected onto the outer shaft cylinder, and a driving motor drives the driven wheel to rotate through a transmission part so as to drive the outer shaft cylinder to rotate. The spline sleeve is arranged in the outer shaft barrel, so that the inner shaft can be driven to rotate, and the inner shaft can slide up and down relative to the outer shaft barrel.

And fourthly, the driving key is simultaneously connected with the inner shaft, the spline sleeve and the driven wheel, and the driving mechanism has the characteristic of compact structure.

Compared with the prior art, the seat body is integrally cast, so that the integral stability is improved, and the processing quality is ensured.

Drawings

Fig. 1 is a schematic perspective view of an improved grinding host according to the present invention.

Fig. 2 is a schematic structural view of a cross section of the present invention.

FIG. 3 is a schematic cross-sectional view of another embodiment of the present invention.

Fig. 4 is an enlarged schematic view of a portion a in fig. 3.

FIG. 5 is a cross-sectional schematic view of the outer shaft barrel, splined sleeve and drive key.

Fig. 6 and 7 are schematic perspective views of two other angles of the present invention.

Fig. 8 is an exploded view of the base and the limiting fixing plate. Fig. 9 is a schematic perspective view of the base.

Fig. 10 is a schematic cross-sectional view of the base.

Fig. 11 is a schematic perspective view of the grinding head.

Fig. 12 is a schematic sectional structure view of the grinding head.

Fig. 13 is a schematic perspective sectional structure view of the grinding head.

Fig. 14 is a perspective view of the swing seat.

FIG. 15 is a schematic view of the structure of the swing seat and the track block.

Fig. 16 is a perspective view of the first external gear and the ring gear.

In the figure:

a seat body 1; a support frame 11; a mounting attachment surface 111; a support slot 112; a seal end cap 113; a limit mounting hole 114; a center cylinder 12; a lubricating oil passage 121; an upper support bearing 122; a motor mounting base 13; installing a rib plate 131; a motor mounting hole 132; an oil supply device 14; a limit fixing plate 15; a limit through hole 151; a stopper rod 16; an electromagnetic valve 17;

a main shaft 2; an outer shaft tube 21; an inner shaft 22; a water passage 221; an extension tube 222; a spline sleeve 23; lubricating the shaft sleeve 24; a lower support bearing 25; an actuation key 26;

a drive motor 3; a driving wheel 31; a driven wheel 32; a drive belt 33;

a grinding head 4; a central shaft 41; a flange joint 411;

a housing 42; a first external gear 431; a second external gear 432; an inner gear ring 433; bearing supports 434; the needle roller has no inner ring bearing 435; an upper fixing seat 436; a track block 44; a slide rail 441; a swing seat 45; the drive pendulum 451; needle roller bearings 452; a grinding block mount 453;

a lifting device 5; a driving seat 51; a four-corner contact bearing 511; an upper cover plate 512; a spacer 513; a lower cover plate 514; a second flange 515; a lift cylinder 52; a cylinder mount 53; a water injection sleeve 531; a water injection pipe 532; a pipeline mounting plate 6; a first flange 61.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.

As shown in fig. 1 to 16, which are improved grinding main machines according to the present invention, the grinding main machines include a base 1, a main shaft 2, a grinding head 4 and a driving motor 3; the main shaft 2 is rotatably mounted on the seat body 1, the driving motor 3 is fixedly mounted on the seat body 1 to drive the main shaft 2 to rotate, and the grinding head 4 is mounted at the lower end of the main shaft 2; the seat body 1 is formed by machining after casting.

Thus, the improved grinding main machine provided by the invention has the advantages that the seat body 1 formed by machining after integral casting is adopted, the integral stability is superior to that of the traditional seat body 1 formed by splicing or welding plates, the stability of the device can be better ensured when the grinding head 4 is used for grinding, and the processing quality of the processed surface is improved. Preferably, the seat body 1 is integrally formed by casting steel.

Preferably, the base body 1 comprises a supporting frame 11, a central cylinder 12 and a motor mounting base 13 which are integrally connected, the central cylinder 12 is formed in the middle of the supporting frame 11, and the spindle 2 is rotatably connected in the central cylinder 12; the motor mounting base 13 is connected to the upper end of the supporting frame 11 and is suspended outside the supporting frame 11; an installation abutting surface 111 is formed on the outer side wall of the support frame 11 below the motor installation seat 13, and a support clamping groove 112 is formed at the upper end of the installation abutting surface 111. The motor mounting seat 13 is arranged outside the supporting frame 11, and a mounting attachment surface 111 and a supporting clamping groove 112 are formed on the outer side wall of the supporting frame 11 below the motor mounting seat 13, so that the seat body 1 is fixedly attached to the side surface of the swing beam through the mounting attachment surface 111, and the motor mounting seat 13 is positioned above the swing beam; so avoided punching on the pendulum beam and be used for installing main shaft 2, the weight of driving motor 3 and main shaft 2 distributes more balancedly on the pendulum beam moreover for the host computer of polishing is more steady on the pendulum beam.

Furthermore, a mounting rib plate 131 is formed on the upper edge of the motor mounting base 13, and a plurality of motor mounting holes 132 are processed on the mounting rib plate 131; the main shaft 2 of the driving motor 3 is downwards arranged on the mounting rib plate 131, so that the driving motor 3 is conveniently arranged on the motor mounting seat 13.

Preferably, the main shaft 2 includes an outer shaft cylinder 21 and an inner shaft 22, the outer shaft cylinder 21 is rotatably connected with the central cylinder 12, a spline sleeve 23 is arranged in the outer shaft cylinder 21, an inner spline is formed on an inner wall of the spline sleeve 23, an outer spline is arranged outside the inner shaft 22, and the inner shaft 22 is connected with the spline sleeve 23 through a spline and can slide along the axial direction of the outer shaft cylinder 21; the upper end of the outer shaft cylinder 21 is connected with a driven wheel 32, and the driven wheel 32 is connected with a driving wheel 31 on an output shaft of the driving motor 3 through a transmission part. By arranging the spindle 2 with the outer shaft cylinder 21 and the inner shaft 22, the outer shaft cylinder 21 is rotatably connected with the base body 1, the driven wheel 32 is connected on the outer shaft cylinder 21, and the driving motor 3 drives the driven wheel 32 to rotate through a transmission part, so as to drive the outer shaft cylinder 21 to rotate. The spline sleeve 23 is arranged in the outer shaft cylinder 21, so that the inner shaft 22 can be driven to rotate, and the inner shaft 22 can slide up and down relative to the outer shaft cylinder 21.

Preferably, the upper part of the central cylinder 12 is provided with an upper support bearing 122 for supporting the outer cylinder 21; the driven wheel 32 abuts against the upper end of the inner ring of the upper support bearing 122 from top to bottom.

Furthermore, the driven wheel 32 and the driving wheel 31 are belt pulleys, and the transmission part is a plurality of transmission belts 33 connected to the driving wheel 31 and the driven wheel 32.

Preferably, the outer shaft cylinder 21 is provided with a through installation groove, a driving key 26 is installed in the through installation groove, and the driving key 26 extends out of the through installation groove and is connected with the spline sleeve 23 and the driven wheel 32. The driving key 26 is connected with the inner shaft 22, the spline sleeve 23 and the driven wheel 32 at the same time, and has the characteristic of compact structure.

Preferably, a lifting device 5 for driving the inner shaft 22 to lift is connected to the upper part of the inner shaft 22; the lifting device 5 comprises a driving seat 51, a lifting oil cylinder 52 and an oil cylinder mounting seat 53; the driving seat 51 is rotatably connected with the inner shaft 22, the cylinder mounting seat 53 is arranged on the seat body 1, the lift cylinder 52 is fixedly connected with the cylinder mounting seat 53, and the lower end of a piston rod of the lift cylinder 52 is fixedly connected with the driving seat 51. With the ascending or descending of the lifting cylinder 52, the driving seat 51 is driven to ascend or descend, and the height position of the inner shaft 22 is adjusted. When the stone is ground, the lifting cylinder 52 descends, and the grinding heads 4 on the inner shaft 22 descend to grind the stone. After finishing the grinding, the lifting cylinder 52 drives the inner shaft 22 to ascend, thereby separating the grinding heads 4 from the plate.

Preferably, a four-corner contact bearing 511 connected to the driving seat 51 is disposed at the upper end of the inner shaft 22, an upper cover plate 512 is disposed above the four-corner contact bearing 511, a spacer 513 sleeved on the inner shaft 22 is disposed below the four-corner contact bearing 511, and a lower cover plate 514 is disposed below the spacer 513. The four corner contact bearings 511 serve to support the upper end of the inner shaft 22, thereby reducing the resistance to rotation of the inner shaft 22.

Preferably, a pipeline mounting plate 6 is arranged between the oil cylinder mounting seat 53 and the seat body 1, a through hole is formed in the middle of the pipeline mounting plate 6, and a first flange 61 higher than the upper surface of the pipeline mounting plate 6 is formed at the edge of the through hole; the lower cover plate 514 is formed with a second flange 515 downward; the outer diameter of the first flange 61 is smaller than the inner diameter of the second flange 515. The second flange 515 rotates along with the rotation of the inner shaft 22, and by arranging the second flange 515 and the first flange 61 which are arranged up and down, water drops or particles falling on the second flange 515 from top to bottom are not easy to pass through the through hole on the pipeline mounting plate 6. The influence of water drops and impurities on the rotation of the outer shaft cylinder 21 and the inner shaft 22 is avoided.

Preferably, an electromagnetic valve 17 for driving and controlling the lift cylinder 52 is arranged in the support frame 11, and the electromagnetic valve 17 is connected with the lift cylinder 52 through a pipeline. In this way, the solenoid valve 17 switches the oil path to raise or lower the lift cylinder 52.

Preferably, a lubricating shaft sleeve is arranged at the lower end of the inner cavity of the outer shaft cylinder 21, and the inner wall of the lubricating shaft sleeve is in abutting contact with the outer wall of the inner shaft 22. The lubricating bushing functions to reduce the resistance to rotation of the inner shaft 22 within the outer shaft sleeve 21.

Preferably, the lower part of the central cylinder 12 is provided with a lower support bearing 25 for supporting the outer shaft cylinder 21, and a sealing end cover 113 is arranged below the lower support bearing 25; a lubricating oil channel 121 communicated with a mounting cavity of a bearing seat of the lower support bearing 25 is arranged in the central cylinder 12; an oil supply device 14 is arranged in the supporting frame 11, and the oil supply device 14 is communicated with the lubricating oil channel 121 through a pipeline. Therefore, lubricating oil is conveyed through the oil supply device 14, lubricating oil can be conveniently added to the lower support bearing 25, the labor cost is saved, and the problem that the working efficiency is influenced by adding the lubricating oil when the equipment is stopped is avoided.

Preferably, a water passage 221 is formed in the center of the inner shaft 22, an extension pipe 222 is connected to the upper end of the water passage 221, a water injection sleeve 531 is arranged at the upper end of the oil cylinder mounting seat 53, a water injection pipe 532 is arranged in the middle of the water injection sleeve 531, the water injection pipe 532 extends into the extension pipe 222 from top to bottom, and the outer wall of the water injection pipe 532 is not in contact with the inner wall of the extension pipe 222. Water can be introduced into the water injection pipe 532 and injected into the water passage 221 to be supplied to the polished surface of the plate. Because the outer wall of the water injection pipe 532 is not in contact with the inner wall of the extension pipe 222, during operation, the inner shaft 22 rotates to drive the extension pipe 222 to rotate, and the water injection pipe 532 is fixedly connected with the oil cylinder mounting seat 53 through the water injection sleeve 531, so that water is conveniently injected into the water passage 221 at the center of the inner shaft 22.

Preferably, the lower end of the seat body 1 is provided with a limit mounting hole 114; a limiting fixing plate 15 is mounted at the lower end of the seat body 1, and the limiting fixing plate 15 is fixedly connected with the limiting mounting hole 114 through a fixing piece; the limiting fixing plate 15 is formed with a limiting through hole 151 which is through up and down, and a limiting rod 16 is arranged in the limiting through hole 151 in a sliding mode up and down.

The grinding head 4 comprises a central shaft 41, a shell 42, a differential mechanism, a track block 44 and a plurality of swinging seats 45; a central shaft 41 is arranged in the shell 42, and the shell 42 and the central shaft 41 rotate at a constant speed; the track block 44 is arranged in the shell 42 and is rotatably connected to the central shaft 41, a plurality of swing seats 45 are rotatably connected to the shell 42, and a grinding block mounting seat 453 positioned outside the shell 42 is formed on each swing seat 45; the track block 44 is coaxially and rotatably connected with the central shaft 41; a slide rail 441 is arranged on the rail block 44, a driving swing rod 451 is arranged at one end of the swing seat 45 in the housing 42, and a roller capable of being connected in the slide rail 441 in a rolling manner is arranged at the free end of the driving swing rod 451; a differential mechanism is connected between the track block 44 and the central shaft 41, and the differential mechanism drives the track block 44 and the central shaft 41 to form differential motion; a bearing support 434 is arranged on the outer side of the inner gear ring 433, and a needle-roller inner-ring-free bearing 435 is arranged between the inner gear ring 433 and the bearing support 434; an upper fixed seat 436 is connected to the bearing support 434, the upper fixed seat 436 is rotatably connected to the central shaft 41, and the fixed seat is connected to the lower end of the limit rod 16.

Preferably, the swing axis of the swing seat 45 is perpendicular to the central axis 41. Therefore, the swinging shaft of the swinging seat 45 is approximately parallel to the grinding plane, and the grinding operation can be better carried out on the plane to be ground.

Preferably, the roller is a needle roller bearing 452, and a roller shaft of the needle roller bearing 452 is mounted on the driving swing rod 451 in a threaded locking manner. Thus, the needle roller bearing 452 can ensure the smoothness of the roller on the slide rail 441, and ensure that the swing seat 45 can swing better along with the rotation of the housing 42.

Preferably, the differential mechanism includes a first external gear 431, a second external gear 432, and an internal gear 433; the first external gear 431 is connected to the central shaft 41 by a spline, and the second external gear 432 is fixedly connected to the track block 44 and is coaxially disposed with the central shaft 41; is eccentrically arranged with the central shaft 41 through an external gear ring and is simultaneously in meshed connection with the first external gear 431 and the second external gear 432; the first external gear 431 and the second external gear 432 have different numbers of teeth. Through the mutual matching of the first external gear 431, the second external gear 432 and the internal gear 433, the rotation speed between the second external gear and the second external gear 432 is caused to be different, so that the rotation speed of the track block 44 relative to the shell 42 is far less than the rotation speed of the shell 42 relative to the shell. Further, when the swing seats 45 swing, the grinding block mounting seats 453 of two adjacent swing seats 45 are close to or far from each other. And two adjacent swing seats 45 change back and forth between the inner splayed state and the outer splayed state.

Preferably, the number of teeth of the first and second

external gears

431 and 432 is different by 1 tooth. Thus, for example, the first external gear 431 has 35 teeth and the second external gear 432 has 36 teeth, so that after the arrangement, the housing 42 needs to rotate 36 times, and the track block 44 rotates 1 time relative to the housing 42.

Preferably, a water passage 221 is formed through the center shaft 41 along the center shaft 41, and a flange joint 411 connected to a lower end of the inner shaft 22 is formed at an upper end of the center shaft 41. When polishing, water needs to be sprayed to a polishing plane to improve polishing effect and reduce dust, and the polishing head is more compact in structure and can move along with the movement of the position of the polishing head 4 through a central hole water injection mode.

Compared with the prior art, the seat body 1 formed by integral casting is adopted, so that the integral stability is improved, and the processing quality is ensured.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.

Claims

1. An improved grinding host machine is characterized by comprising a seat body, a main shaft, a grinding head and a driving motor; the main shaft is rotatably arranged on the seat body, the driving motor is fixedly arranged on the seat body to drive the main shaft to rotate, and the grinding head is arranged at the lower end of the main shaft; the seat body is formed by casting and machining; the lower end of the seat body is provided with a limiting mounting hole.

2. An improved grinding host machine as claimed in claim 1, wherein a limiting fixing plate is mounted at the lower end of the seat body, and the limiting fixing plate is fixedly connected with the limiting mounting hole through a fixing member; and a limiting through hole which is communicated up and down is formed in the limiting fixing plate, and a limiting rod is arranged in the limiting through hole in a sliding manner up and down.

3. An improved grinding host machine as claimed in claim 1, wherein said base body comprises a support frame, a central cylinder and a motor mounting seat which are integrally connected, said central cylinder is formed in the middle of said support frame, and said main shaft is rotatably connected in said central cylinder; the motor mounting seat is connected to the upper end of the supporting frame and is suspended outside the supporting frame; an installation binding surface is formed on the outer side wall of the supporting frame below the motor installation seat, and a supporting clamping groove is formed at the upper end of the installation binding surface.

4. An improved sanding main machine as defined in claim 3 wherein a reinforcing spacer is integrally formed in the middle of said support frame.

5. An improved grinding host machine according to claim 3, wherein a mounting rib plate is formed on the upper edge of the motor mounting seat, and a plurality of motor mounting holes are processed on the mounting rib plate; the driving motor spindle is downwards arranged on the mounting rib plate.