High-precision positioning rotary table assembly of polishing machine with grinding head of electric grinding machine

Abstract

The invention provides a high-precision positioning rotary table assembly of an electric grinder grinding head polishing machine, and belongs to the technical field of electric angle grinder grinding head manufacturing. The problems that high-automation station switching equipment is not developed for an existing grinding head polishing machine, and meanwhile high precision and concise performance need to be guaranteed are solved. The device comprises a base internally provided with a cavity, a disc-shaped rotary table rotationally arranged above the base through a center shaft, and a switching driving piece arranged in the cavity and used for providing rotation of the rotary table. Six stations are arranged above the base and sequentially comprise the feeding station, the forward polishing station, the turn-over station, the reverse polishing station, the discharging station and the positioning station in the clockwise direction. Compared with the prior art, the rotary table assembly is extremely high in positioning precision, a detection station is independently arranged, and precise positioning detection after station switching is achieved through a laser detector.

Description

Technical Field

[0001] The invention belongs to the technical field of electric angle grinder grinding head manufacturing, and relates to a high-precision positioning turntable assembly of an electric grinder grinding head polishing machine. Background Art

[0002] An electric angle grinder is a handheld power tool used for grinding. Its end can be equipped with a variety of grinding heads, such as coarse grinding wheels, fine grinding wheels, polishing wheels, rubber wheels, cutting wheels, wire wheels, etc. These grinding heads are all characterized by being disc-shaped.

[0003] The disc-shaped grinding head must also be surface ground and polished before leaving the factory to remove burrs and make the upper and lower end surfaces of the grinding head neat and symmetrical. The grinding head with uniform and symmetrical materials on both end surfaces will have better coaxiality in a rotating working environment.

[0004] The disc-shaped grinding head can be used in the polishing process because only its upper and lower end surfaces need to be polished. Therefore, the following method can be used during the polishing process: first, clamp it for the first time, so that the upper end surface of the grinding head faces upward and the lower end surface faces downward, and then the polishing wheel of the polishing machine descends from the top to the upper end surface of the grinding head to complete the polishing of the upper end surface; then clamp it for the second time, turn the grinding head over so that the lower end surface faces upward and the upper end surface faces downward, and then the polishing wheel of the polishing machine descends from the top again to the lower end surface of the grinding head to complete the polishing of the upper end surface.

[0005] In the above design methods, the station switching process can use a turntable type device. During the design process, at least 5 stations are guaranteed, namely: the first station for placing the unpolished grinding head, the second station for polishing the upper end surface of the grinding head, the third station for turning the grinding head over, the fourth station for polishing the lower end surface of the turned grinding head, and the fifth station for unloading the polished grinding head. Among them, polishing equipment needs to be set above the second station and the fourth station to complete the polishing work, so the grinding head at the second station or the fourth station also needs to have the function of automatic turnover, because the polishing equipment will only polish the grinding head from one side, at this time, the self-rotation of the grinding head is required to adjust the position that can be polished.

[0006] Based on the above concepts, the applicant believes that when developing a turntable-type station switching device for a grinding head polishing machine, two key factors need to be overcome: the first is that the accuracy of each station switching needs to be guaranteed. After each switch, the grinding head needs to be completely in the above-mentioned 5 respective stations to ensure that the loading robot, unloading robot, flipping robot and two positive and negative polishing devices can accurately complete their respective operations, so high-precision switching requirements are very important; the second is that the driving parts of the grinding head self-rotation need to be simplified. After each grinding head is clamped, it will shift to There are two polishing stations, so the grinding head needs to rotate in these two stations to cooperate with the polishing equipment to complete the full coverage polishing operation. However, except for the two polishing operations, the grinding head cannot rotate in other stations because the grinding head cannot be clamped by the loading robot, unloading robot, or flipping robot during the rotation process. If each station where the grinding head is placed is equipped with an independent rotating drive component to complete the self-rotation function of the grinding head, the large number of rotating drive components will lead to increased energy waste and cost, and because each rotating drive component needs to be started and stopped at the right time, the controller will be more complicated. Summary of the invention

[0007] The purpose of the present invention is to propose a high-precision positioning turntable assembly for an electric grinder and polisher to address the problem that the existing grinding head and polisher have not developed highly automated station switching equipment and need to ensure high precision and simplified performance.

[0008] The purpose of the present invention can be achieved by the following technical solutions: A high-precision positioning turntable assembly for an electric grinder and a grinding head polisher, characterized in that it includes a base with a cavity inside, a disc-shaped turntable arranged above the base and rotatable by a central axis, and a switching drive member arranged in the cavity for providing rotation of the turntable; there are 6 workstations above the base, which are, in clockwise order: a loading station, a positive polishing station, a flipping station, a reverse polishing station, an unloading station, and a positioning station; 6 workstations for placing grinding heads are symmetrically arranged on the center of the turntable, a main shaft is fixed to the bottom of each workstation and is rotatably connected to the turntable through the main shaft; a laser detector is arranged above the positioning station, and a laser probe of the laser detector is arranged downward to detect whether the workstation below is completely in the positioning station.

[0009] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polishing machine, a middle bracket plate is provided at the middle height of the base cavity, and a fixed-point driving component for driving the main shaft at the positive polishing station and the reverse polishing station to rotate is provided in the base cavity. The fixed-point driving component includes a frame rail fixedly arranged in the base laterally, two groups of frame blocks slidably symmetrically arranged on the slide rail and with axial holes in the vertical direction, and two freely rotating driving shafts arranged in the axial holes of the two frame blocks. An anti-separation constraint structure is provided between the driving shaft and the axial hole, a driving wheel is provided on the top fixed sleeve of the driving shaft, and an axial wheel is provided on the bottom fixed sleeve of the main shaft in the same plane as the driving wheel. When the main shaft rotates to the positive polishing station and the reverse polishing station along with the turntable, the axial wheel at this location is in contact with the driving wheel, and a power component is provided at the bottom end of the driving shaft.

[0010] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polishing machine, an upper rail is fixedly arranged longitudinally above the middle bracket plate, an upper movable block is slidably arranged on the upper rail, an upper seat and an electromagnetic block with strong magnetism after power is turned on are also arranged on the middle bracket plate, the electromagnetic block is located between the upper rail and the center axis, the upper rail is located between the upper seat and the electromagnetic block, the upper movable block is made of magnetic material, the start and stop switch of the electromagnetic block is synchronized with the start and stop switch of the switching drive member, a tightening spring is arranged between the upper seat and the upper movable block, the tightening spring makes the upper movable block have a tendency to be pulled toward the upper seat when not subject to external force, the adsorption force of the electromagnetic block on the upper movable block when power is turned on is greater than the traction force of the tightening spring on the upper movable block, a first hinge shaft is arranged on the frame block, and a second hinge shaft is arranged on the upper movable block, the two first hinge shafts on the two frame blocks are connected with the second hinge shaft through two sets of symmetrical connecting rods, and after the upper movable block approaches the upper seat, the two connecting rods push the two frame blocks to separate from each other until the driving wheel and the shaft wheel are tightly fitted.

[0011] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polishing machine, the frame block includes a first frame and a second frame, the first frame is provided with a square hole with a square cross-section, the second frame is fixed with a square rod, and the square rod is movably embedded in the square hole, an outward push spring is provided between the first frame and the second frame, and when no external force is applied, the outward push spring makes the second frame tend to bounce away from the first frame, the first frame is slidably connected to the frame rail, and the axial hole is provided on the second frame.

[0012] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polishing machine, the power component includes a driven wheel fixedly sleeved on the bottom of the driving shaft, a lower seat and a lower rail fixed on the bottom surface of the middle bracket plate, and a lower movable block slidably arranged on the lower rail. The lower rail is longitudinally arranged, and a power motor is arranged in the lower seat. The output end fixed sleeve of the power motor is provided with an output wheel, and the bottom fixed sleeve of the driving shaft is provided with an input wheel in the same plane as the output wheel. A belt is provided in a tensioning sleeve between the input wheels and the output wheels of the two driving shafts, and a tensioning spring is provided between the lower seat and the lower movable block. The tensioning spring pushes the lower movable block in the direction away from the lower seat until the belt is tightened.

[0013] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polisher, the lower rail is in an inverted "T" shape, and a T-shaped groove matching the size of the lower rail is opened on the lower movable block, and the T-shaped groove is connected to the lower rail.

[0014] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polisher, the constraint structure is specifically an annular groove opened on the outer ring edge of the middle of the shaft hole and a circular ring fixed on the outer ring edge of the drive shaft. The circular ring is consistent in size with the annular groove and is located in the annular groove.

[0015] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polisher, the turntable is made of non-magnetic material, 6 magnetic positioning bodies are symmetrically arranged on the outer edge of the turntable, and an electromagnet with strong magnetism when powered on is provided on the base.

[0016] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polisher, a vertical pole is erected in the middle of the workstation, and an upper end of the vertical pole has an oblique rounded corner.

[0017] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polisher, a placement groove consistent with the outer contour size of the grinding head is opened at the center of the upper surface of the workstation table, and the depth of the placement groove is less than the thickness of the grinding head.

[0018] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polisher, the fixed sleeve on the main shaft is provided with two groups of limiting plates with a spacing consistent with the thickness of the turntable, and the turntable is located between the two groups of limiting plates.

[0019] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polisher, an electromagnetic plate with strong magnetism after being energized is provided on the bottom surface of the workstation.

[0020] In the above-mentioned high-precision positioning turntable assembly of an electric grinder and polisher, each rotating connection of the turntable assembly is provided with a bearing.

[0021] Compared with the prior art, the turntable assembly of the present invention has extremely high positioning accuracy. A separate detection station is set up to achieve precise positioning detection after station switching through a laser detector, and then an electromagnet and a positioning body are provided to achieve accurate positioning after a single station switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the turntable assembly; Figure 2 It is a schematic diagram of the top structure of the turntable assembly; Figure 3 This is a schematic diagram of the bottom structure of the turntable assembly after the base bottom plate and tail plate are hidden; Figure 4This is a first structural schematic diagram of the turntable assembly after the middle bracket plate and the following parts are cut off; Figure 5 This is a second structural schematic diagram of the turntable assembly after the middle bracket plate and the following parts are cut off; Figure 6 is a schematic diagram of the first structure of the rear part of the turntable assembly; Figure 7 is a schematic diagram of the second structure of the rear part of the turntable assembly; In the figure, 1, base; 2, central axis; 3, turntable; 4, main axis; 5, middle bracket plate; 6, frame rail; 7, frame block; 71, first frame; 72, second frame; 8, driving shaft; 9, driving wheel; 10, shaft wheel; 11, upper rail; 12, upper movable block; 13, electromagnetic block; 14, tensioning spring; 15, connecting rod; 16, push-out spring; 17; work station; 18, lower seat; 19, lower rail; 20, output wheel; 21, input wheel; 22, belt; 23, tensioning spring; 24, positioning body; 25, electromagnet; 26, vertical pole; 27, mounting groove; 28, limiting plate; 29, upper seat; 30; lower movable block. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] like Figure 1 As shown, the high-precision positioning turntable assembly of the electric grinder grinding head polishing machine is characterized by: comprising a base 1 with a cavity inside, a disc-shaped turntable 3 arranged above the base 1 and rotatable by a central axis 2, and a switching drive member (not shown in the figure) arranged in the cavity for providing rotation of the turntable 3.

[0025] There are 6 workstations above the base 1, which are in clockwise order: loading station, positive polishing station, flipping station, reverse polishing station, unloading station, and positioning station; the loading station, positive polishing station, flipping station, reverse polishing station, and unloading station correspond to the 5 workstations mentioned in the background technology, a loading robot is arranged above the loading station, a positive polishing device is arranged above the positive polishing station, a flipping robot is arranged above the flipping station, a reverse polishing device is arranged above the reverse polishing station, and a unloading robot is arranged above the unloading station.

[0026] Six workstations 17 for placing grinding heads are symmetrically arranged on the turntable 3. A spindle 4 is fixed to the bottom of each workstation and is rotatably docked with the turntable 3 through the spindle 4. A laser detector is arranged above the positioning station, and the laser probe of the laser detector is arranged downward to detect whether the workstation below is completely in the positioning station.

[0027] The switching drive is generally realized by controlling the motor and the transmission to ensure that the output end of the switching drive can output 1 / 6 of a circle of rotation in a single operation, that is, to switch the rotation angle of a work station.

[0028] The following methods can be used for the detection process. First, a mark can be set at a fixed position on the workstation. In the working state (the working state means that the 6 workstations are completely and accurately in the 6 workstations), the mark should be directly below the laser probe. Then, after each workstation switch, the laser probe detects and collects the mark below. If the probe feedback normally collects the mark, it proves that the workstation is completely in the workstation. If the probe feedback does not collect the mark or the collection is incomplete, it proves that the workstation is offset. The laser detector can be connected to an external alarm. When the workstation is offset, the alarm sends an alarm signal to allow technicians to correct the deviation. Therefore, under this design method, the turntable assembly can achieve a very high-precision positioning function in each workstation switching process.

[0029] like Figure 3 , Figure 6 , Figure 7 As shown, a middle bracket plate 5 is provided at the middle height of the cavity of the base 1, and a fixed-point driving member for driving the main shaft 4 in the positive polishing station and the reverse polishing station to rotate is provided in the cavity of the base 1. The fixed-point driving member includes a frame rail 6 fixedly arranged in the base 1 laterally, two sets of frame blocks 7 which are slidably symmetrically arranged on the slide rail and have axial holes in the vertical direction, and two freely rotatable driving shafts 8 arranged in the axial holes of the two frame blocks 7. An anti-separation constraint structure is provided between the driving shaft 8 and the axial holes, a driving wheel 9 is provided on the top fixed sleeve of the driving shaft 8, and a shaft wheel 10 which is coplanar with the driving wheel 9 is provided on the bottom fixed sleeve of the main shaft 4. When the main shaft 4 rotates to the positive polishing station and the reverse polishing station along with the turntable 3, the shaft wheel 10 at this location is in contact with the driving wheel 9, and a power component is provided at the bottom end of the driving shaft 8.

[0030] The power component provides power for the rotation of the drive shaft 8 of the positive polishing station and the reverse polishing station. The movable design of the frame block 7 can make it optional whether the drive wheel 9 is attached to the shaft wheel 10. Because the shaft wheel 10 is in the process of rotating with the turntable 3, the shaft wheel 10 that was originally in contact with the drive wheel 9 will shift. If the drive wheel 9 is fixed in a specific position, the movement of the shaft wheel 10 will be blocked by the interference of the drive wheel 9.

[0031] like Figure 4 and Figure 5As shown, an upper rail 11 is longitudinally fixed above the middle bracket plate 5, an upper movable block 12 is slidably provided on the upper rail, an upper seat 29 and an electromagnetic block 13 with strong magnetism after power is turned on are also provided on the middle bracket plate 5, the electromagnetic block 13 is located between the upper rail 11 and the central axis 2, the upper rail 11 is located between the upper seat and the electromagnetic block 13, the upper movable block 12 is made of magnetic material, the start and stop switch of the electromagnetic block 13 is synchronized with the start and stop switch of the switching drive member, a tightening spring 14 is provided between the upper seat and the upper movable block 12, and the tightening spring 14 The upper movable block 12 has a tendency to be pulled toward the upper seat when not subject to external force. When the electromagnetic block 13 is energized, the adsorption force on the upper movable block 12 is greater than the traction force of the tightening spring 14 on the upper movable block 12. A first hinge shaft is provided on the frame block 7, and a second hinge shaft is provided on the upper movable block 12. The two first hinge shafts and the second hinge shafts on the two frame blocks 7 are connected by two groups of symmetrical connecting rods 15. After the upper movable block 12 is close to the upper seat, the two connecting rods 15 push the two frame blocks 7 to separate from each other until the driving wheel 9 and the shaft wheel 10 are tightly fitted.

[0032] Because the start / stop switch of the electromagnetic block 13 is synchronized with the start / stop switch of the switching drive, and because the adsorption force of the electromagnetic block 13 on the upper movable block 12 when it is energized is greater than the traction force of the tightening spring 14 on the upper movable block 12, when the central shaft 2 rotates 1 / 6 of a circle to switch one work position, the electromagnetic block 13 will be energized to generate strong magnetism as soon as the switching drive is started, and then the upper movable block 12 will be adsorbed to the electromagnetic block 13 once. Under the pulling action of the connecting rods 15 on both sides, the two frame blocks 7 will move closer to each other, that is, the driving wheel 9 above the driving shaft 8 in the frame block 7 will retract inward and no longer fit with the shaft wheel 10 here, but maintain a larger distance, so that the shaft wheel 10 here will not be interfered by the driving wheel 9 during the rotation of the turntable 3.

[0033] Figure 4 and Figure 5 The two frames 7 are shown in the separated and closed states respectively.

[0034] like Figure 6 and Figure 7 As shown, the frame block 7 includes a first frame 71 and a second frame 72. A square hole with a square cross-section is opened on the first frame 71, and a square rod is fixed on the second frame 72. The square rod is movably embedded in the square hole. An outward push spring 16 is provided between the first frame 71 and the second frame 72. When there is no external force, the outward push spring 16 makes the second frame 72 have a tendency to bounce away from the first frame 71. The first frame 71 is slidably connected to the frame rail 6, and the axial hole is opened on the second frame 72.

[0035] The push-out spring 16 has two functions: first, it enables the driving wheel 9 to fit tightly against the axle wheel 10 normally. Since the driving shaft 8 is arranged in the axle hole of the second frame 72, after the first frame 71 is shifted, the driving shaft 8 can fit tightly against the axle wheel 10, thereby reducing the possibility of slipping. Second, it provides another insurance measure to prevent the driving wheel 9 from interfering with the movement of the axle wheel 10. In addition to adsorbing the electromagnetic block 13 and finally making the driving wheel 9 retreat, if there is still a slight interference, the push-out spring 16 can retract, and the direct movement of the axle wheel 10 will also squeeze the driving wheel 9 to make it give way.

[0036] Figure 6 and Figure 7 The figures respectively reflect the states of the second frame 72 being opened and closed relative to the first frame 71.

[0037] like Figure 3 As shown, the power component includes a lower seat 18 and a lower rail 19 fixed to the bottom surface of the middle bracket plate 5, a lower movable block 30 slidably arranged on the lower rail 19, the lower rail 19 is arranged longitudinally, a power motor is arranged in the lower seat 18, an output end fixed sleeve of the power motor is provided with an output wheel 20, the bottom end fixed sleeve of the driving shaft 8 is provided with an input wheel 21 in the same plane as the output wheel 20, a belt 22 is tightened between the input wheel 21 and the output wheel 20 of the two driving shafts 8, a tightening spring 23 is provided between the lower seat 18 and the lower movable block, and the tightening spring pushes the lower movable block in the direction away from the lower seat 18 until the belt 22 is tightened.

[0038] The lower rail 19 is in an inverted "T" shape, and a T-shaped groove matching the size of the lower rail 19 is provided on the lower movable block, and the T-shaped groove is butted against the lower rail 19.

[0039] The constraint structure specifically includes an annular groove provided at the outer edge of the middle of the shaft hole and a circular ring fixed at the outer edge of the driving shaft 8. The circular ring has the same size as the annular groove and is located in the annular groove.

[0040] like Figure 2 As shown, the turntable 3 is made of non-magnetic material, and six magnetic positioning bodies 24 are symmetrically arranged on the outer edge of the turntable 3. The base 1 is provided with an electromagnet 25 which has strong magnetism when powered on.

[0041] When the electromagnet 25 is energized, it will absorb the nearest positioning body 24, so that the positioning body 24 is shifted to the position closest to the electromagnet 25. This state is the working state. Normally, after each workstation switch is completed, the workstation table will be in its respective workstation. However, this solution also provides an additional positioning function. After each workstation switch is completed, the electromagnet 25 is energized to absorb the nearest positioning body 24, so that the positioning body 24 is completely in the characteristic position closest to the electromagnet 25. This is equivalent to completing a secondary positioning effect, which makes the positioning accuracy higher.

[0042] like Figure 2 As shown, a vertical pole 26 is erected in the middle of the workstation, and the upper end of the vertical pole 26 has an oblique rounded corner.

[0043] A docking hole is generally provided in the center of the disc-shaped grinding head, through which the grinding head can be fixed to the output shaft of the electric grinder. If the size of the vertical rod 26 is set to be consistent with the docking hole, then when the docking hole of the grinding head is inserted into the vertical rod 26, the grinding head can be directly loosened, and the grinding head will automatically fall and stick to the workstation when it is sleeved on the top of the vertical rod 26. In addition, because the polishing wheel of the polishing equipment needs to polish the surface of the grinding head, friction will be generated during the contact between the polishing wheel and the surface of the grinding head. If the grinding head is not fixed, the grinding head will deviate or even fly out under the action of friction. At this time, the vertical rod 26 can limit the grinding head.

[0044] like Figure 2 As shown, a placement groove 27 having the same size as the outer contour of the grinding head is provided at the center of the upper surface of the workstation, and the depth of the placement groove 27 is less than the thickness of the grinding head.

[0045] Because the polishing wheel of the polishing equipment needs to polish the surface of the grinding head, friction will be generated during the contact between the polishing wheel and the surface of the grinding head. If the grinding head is not fixed, the grinding head will deviate or even fly out under the action of friction. The placement groove 27 can limit the grinding head at this time.

[0046] like Figure 6 As shown, two sets of limiting plates 28 are fixedly sleeved on the main shaft 4 and the spacing between them is consistent with the thickness of the turntable 3 , and the turntable 3 is located between the two sets of limiting plates 28 .

[0047] The two groups of limiting plates 28 set the turntable 3 between them, forming a good vertical limiting effect, so that the main shaft 4 and the workbench connected thereto will not be separated from the turntable 3.

[0048] An electromagnetic plate with strong magnetism when powered on is provided on the bottom of the workstation.

[0049] Considering that most grinding heads are made of metal, the strong magnetism formed when the electromagnetic plate is energized can firmly adsorb the grinding head, so that the grinding head can be fixed on the workbench.

[0050] Each rotating connection of the turntable assembly is provided with a bearing.

[0051] It should be understood that in the claims and description of the present invention, all "including..." should be understood as an open-ended meaning, that is, its meaning is equivalent to "at least contains...", and should not be understood as a closed meaning, that is, its meaning should not be understood as "only includes...".

[0052] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A high-precision positioning turntable assembly for an electric grinder and polisher, characterized in that: It includes a base with a cavity inside, a disc-shaped turntable arranged above the base and rotating through a central axis, and a switching drive member arranged in the cavity for providing rotation of the turntable; there are 6 workstations above the base, which are: loading station, positive polishing station, flipping station, reverse polishing station, unloading station, and positioning station in a clockwise direction; 6 workstations for placing grinding heads are symmetrically arranged on the center of the turntable, and a main shaft is fixed to the bottom of each workstation and is rotatably connected to the turntable through the main shaft; a laser detector is arranged above the positioning station, and the laser probe of the laser detector is arranged downward to detect whether the workstation below is completely in the positioning station.

2. The high-precision positioning turntable assembly of an electric grinder and polisher according to claim 1, characterized in that: A middle bracket plate is provided at the middle height of the base cavity, and a fixed-point driving component for driving the main shaft at the positive polishing station and the reverse polishing station to rotate is provided in the base cavity. The fixed-point driving component includes a frame rail fixedly arranged in the base laterally, two sets of frame blocks symmetrically arranged on the slide rail and having axial holes in the vertical direction, and two freely rotating driving shafts arranged in the axial holes of the two frame blocks. An anti-separation constraint structure is provided between the driving shaft and the axial hole, a driving wheel is provided on the top fixed sleeve of the driving shaft, and an axial wheel is provided on the bottom fixed sleeve of the main shaft in the same plane as the driving wheel. When the main shaft rotates to the positive polishing station and the reverse polishing station along with the turntable, the axial wheel at this location is in contact with the driving wheel, and a power component is provided at the bottom end of the driving shaft.

3. The high-precision positioning turntable assembly of an electric grinder and polisher according to claim 2, characterized in that: An upper rail is fixed longitudinally above the middle bracket plate, an upper movable block is slidably provided on the upper cabinet, an upper seat and an electromagnetic block with strong magnetism after power is turned on are also provided on the middle bracket plate, the electromagnetic block is located between the upper rail and the central axis, the upper rail is located between the upper seat and the electromagnetic block, the upper movable block is made of magnetic material, the start and stop switch of the electromagnetic block is synchronized with the start and stop switch of the switching drive member, a tightening spring is provided between the upper seat and the upper movable block, the tightening spring makes the upper movable block have a tendency to be pulled toward the upper seat when not subject to external force, the adsorption force of the electromagnetic block on the upper movable block when power is turned on is greater than the traction force of the tightening spring on the upper movable block, a first hinge shaft is provided on the frame block, a second hinge shaft is provided on the upper movable block, the two first hinge shafts on the two frame blocks are connected with the second hinge shaft through two sets of symmetrical connecting rods, and after the upper movable block approaches the upper seat, the two connecting rods push the two frame blocks to separate from each other until the driving wheel and the shaft wheel are tightly fitted.

4. The high-precision positioning turntable assembly of an electric grinder and polisher according to claim 2, characterized in that: The frame block includes a first frame and a second frame. A square hole with a square cross-section is opened on the first frame. A square rod is fixed on the second frame. The square rod is movably embedded in the square hole. An outward push spring is arranged between the first frame and the second frame. When no external force is applied, the outward push spring makes the second frame tend to bounce away from the first frame. The first frame is slidably connected to the frame rail, and an axial hole is opened on the second frame.

5. The high-precision positioning turntable assembly of an electric grinder and polisher according to claim 2, characterized in that: The power component includes a driven wheel fixedly sleeved on the bottom of the driving shaft, a lower seat and a lower rail fixed on the bottom surface of the middle bracket plate, and a lower movable block slidably arranged on the lower rail. The lower rail is arranged longitudinally, and a power motor is arranged in the lower seat. The output end fixed sleeve of the power motor is provided with an output wheel, and the bottom fixed sleeve of the driving shaft is provided with an input wheel coplanar with the output wheel. A belt is tightened between the input wheels and the output wheels of the two driving shafts, and a tightening spring is arranged between the lower seat and the lower movable block. The tightening spring pushes the lower movable block in the direction away from the lower seat until the belt is tightened.

6. The high-precision positioning turntable assembly of an electric grinder and polisher according to claim 2, characterized in that: The restraining structure is specifically a ring groove opened on the outer ring edge of the middle of the shaft hole and a circular ring fixed on the outer ring edge of the driving shaft. The circular ring is consistent in size with the ring groove and is located in the ring groove.

7. The high-precision positioning turntable assembly of an electric grinder and polisher according to claim 1, characterized in that: The turntable is made of non-magnetic material, and six magnetic positioning bodies are symmetrically arranged at the center of the outer edge of the turntable. An electromagnet with strong magnetism after power is turned on is arranged on the base.

8. The high-precision positioning turntable assembly of an electric grinder and polisher according to claim 1, characterized in that: A vertical pole is erected in the middle of the workstation, and an oblique rounded corner is provided at the upper end of the vertical pole.

9. The high-precision positioning turntable assembly of an electric grinder and polisher according to claim 1, characterized in that: A placement groove which is consistent with the outer contour size of the grinding head is opened at the center of the upper surface of the workstation table, and the depth of the placement groove is less than the thickness of the grinding head.

10. The high-precision positioning turntable assembly of an electric grinder and polisher according to claim 1, characterized in that: The fixed sleeve on the main shaft is provided with two groups of limiting plates whose spacing is consistent with the thickness of the turntable, and the turntable is located between the two groups of limiting plates.

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