A positioning turntable assembly for an electric grinder and polishing machine

Abstract

The present invention provides a positioning turntable assembly for an electric grinder grinding head and polishing machine, belonging to the technical field of electric angle grinder grinding head manufacturing. It solves the problem that the existing grinding head and polishing machine has not developed a highly automated workstation switching device, and at the same time needs to ensure high precision and simple performance. The present invention includes a base with a cavity inside, a disc-shaped turntable arranged above the base by rotating the 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: loading station, positive polishing station, flipping station, reverse polishing station, unloading station, and positioning station. Compared with the existing technology, the positioning accuracy of the turntable assembly of the present invention is extremely high, and a separate detection station is set up to realize precise positioning detection after the workstation switching by using 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 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 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 faces of the grinding head neat and symmetrical. A grinding head with uniform and symmetrical materials on both end faces will have better coaxiality in a rotating working environment.

[0004] During the polishing process of the disc-shaped grinding head, since only the upper and lower end surfaces need to be polished, 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 up and the lower end surface faces down, 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 up and the upper end surface faces down, 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 lower end surface.

[0005] In the above design methods, the station switching process can use a turntable-type device. During the design process, at least five 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 flipping the grinding head, the fourth station for polishing the lower end surface of the flipped grinding head, and the fifth station for unloading the polished grinding head. Among them, polishing equipment needs to be installed above the second and fourth stations to complete the polishing work. In this case, the grinding head in the second or 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 grinding head needs to rotate to adjust the polishing position.

[0006] Based on the above concept, the applicant believes that when developing the turntable type station switching equipment in the grinding head polishing machine, two key factors need to be overcome: the first is that the accuracy of each switching station needs to be guaranteed. After each switching, the grinding head needs to be completely in the above 5 respective stations to ensure that the loading robot, unloading robot, flipping robot and two positive and negative polishing equipment 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 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 stations, the grinding head cannot rotate in other stations because the grinding head cannot be clamped by the loading robot, unloading robot, and flipping robot during the rotation process. If each station where the grinding head is placed is equipped with an independent rotating drive to complete the rotation function of the grinding head, the number of rotating drives is large, resulting in energy waste and increased costs. Moreover, because each rotating drive needs to be started and stopped at the right time, the controller is more complicated. Summary of the Invention

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

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A positioning turntable assembly for an electric grinder and polisher comprises a base with a cavity inside, a disc-shaped turntable arranged above the base and rotatable via a central axis, and a switching drive member arranged in the cavity for providing rotation of the turntable; six workstations are arranged 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; six 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 docked with the turntable via the main shaft; a laser detector is provided 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.

[0010] In the above-mentioned 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 in 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 that are slidingly symmetrically arranged on the frame rail and have 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, and the top fixed sleeve of the driving shaft is provided with a driving wheel, and the bottom fixed sleeve of the main shaft is provided with an axial wheel in the same plane as the driving wheel. When the main shaft rotates with the turntable to the positive polishing station and the reverse polishing station, 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.

[0011] The upper track is fixedly mounted on the center support plate, and the upper track is slidingly mounted on the center support plate. The upper track is slidingly mounted on the center support plate. The upper track is fixedly mounted on the center support plate, and the upper track is slidingly mounted on the center support plate. The upper track is slidingly mounted on the center support plate. The upper track is slidingly mounted on the center support plate.

[0012] In the above-mentioned 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, and the second frame is fixed with a square rod, which is movably embedded in the square hole. An outward push spring is provided between the first frame and the second frame. When not subject to external force, the outward push spring causes the second frame to have a tendency 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.

[0013] In the above-mentioned 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 arranged longitudinally, and a power motor is arranged in the lower movable block. The output end fixed sleeve of the power motor is provided with an output wheel, and the bottom end 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 wheel and the output wheel 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 away from the lower seat until the belt is tightened.

[0014] In the positioning turntable assembly of the electric grinder and polisher, the lower rail is in an inverted "T" shape, and a T-slot matching the size of the lower rail is provided on the lower movable block, and the T-slot is docked with the lower rail.

[0015] In the above-mentioned positioning turntable assembly of an electric grinder and polisher, the constraint structure is 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.

[0016] In the positioning turntable assembly of the above-mentioned electric grinder and polisher, the turntable is made of non-magnetic material, six 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.

[0017] In the above-mentioned positioning turntable assembly of the electric grinder and polishing machine, a vertical pole is erected in the middle of the work station, and the upper end of the vertical pole has an oblique rounded corner.

[0018] In the positioning turntable assembly of the electric grinder and polisher, a placement groove having the same dimensions 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 is less than the thickness of the grinding head.

[0019] In the positioning turntable assembly of the electric grinder and polisher, the fixed sleeve on the main shaft is provided with two sets of limiting plates with a spacing consistent with the thickness of the turntable, and the turntable is located between the two sets of limiting plates.

[0020] In the positioning turntable assembly of the electric grinder and polisher, the bottom surface of the workstation is provided with an electromagnetic plate which has strong magnetism when powered on.

[0021] In the positioning turntable assembly of the electric grinder and polishing machine, each rotating connection of the turntable assembly is provided with a bearing.

[0022] Compared with the existing technology, the turntable assembly of the present invention has extremely high positioning accuracy. A separate detection station is set up to use a laser detector to achieve precise positioning detection after the station is switched, and then an electromagnet and a positioning body are provided to achieve accurate positioning after a single station switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the turntable assembly;

[0024] Figure 2 This is a schematic diagram of the top structure of the turntable assembly;

[0025] 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;

[0026] Figure 4 This is a schematic diagram of the first structure of the turntable assembly after the middle bracket plate and the following parts are cut off;

[0027] Figure 5 This is a second structural diagram of the turntable assembly after the middle bracket plate and the following parts are cut off;

[0028] Figure 6 This is a schematic diagram of the first structure of the rear part of the turntable assembly;

[0029] Figure 7 1. It is a schematic diagram of the second structure of the rear part of the turntable assembly;

[0030] In the figure, 1. base; 2. center axis; 3. turntable; 4. main axis; 5. middle support plate; 6. frame rail; 7. frame block; 71. first frame; 72. second frame; 8. drive shaft; 9. drive 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

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0032] like Figure 1 As shown, the positioning turntable assembly of the electric grinder grinding head polishing machine includes a base 1 with a cavity inside, a disc-shaped turntable 3 arranged above the base 1 and rotated 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.

[0033] 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 set above the loading station, a positive polishing device is set above the positive polishing station, a flipping robot is set above the flipping station, a reverse polishing device is set above the reverse polishing station, and an unloading robot is set above the unloading station.

[0034] 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 provided above the positioning station, and the laser probe of the laser detector is set downward to detect whether the workstation below is completely in the positioning station.

[0035] The switching drive is generally implemented by controlling the motor and the transmission to ensure that the output end of the switching drive can output a rotation of 1 / 6 of a circle in a single operation, that is, to switch the rotation angle of a work station.

[0036] The following method can be used for the detection process. First, a marker can be set at a fixed position on the workstation. In the working state (the working state means that the six workstations are completely and accurately located within the six workstations), the marker should be directly below the laser probe. Then, after each workstation switch, the laser probe detects and collects the marker below. If the probe feedback normally collects the marker, it proves that the workstation is completely located in that workstation. If the probe feedback does not collect the marker 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 deviates, the alarm will sound an alarm signal, allowing technicians to perform corrections. Therefore, under this design method, this turntable assembly can achieve very high-precision positioning function during each workstation switching process.

[0037] 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 component 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 component includes a frame rail 6 fixedly arranged in the base 1 laterally, two groups of frame blocks 7 that are slidingly symmetrically arranged on the frame rail and have axial holes in the vertical direction, and two freely rotating 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 hole. The top fixed sleeve of the driving shaft 8 is provided with a driving wheel 9, and the bottom fixed sleeve of the main shaft 4 is provided with an axial wheel 10 in the same plane as the driving wheel 9. When the main shaft 4 rotates to the positive polishing station and the reverse polishing station along with the turntable 3, the axial wheel 10 at this location is in contact with the driving wheel 9, and the bottom end of the driving shaft 8 is provided with a power component.

[0038] 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.

[0039] like Figure 4 and Figure 5As shown, an upper rail 11 is fixed longitudinally above the middle bracket plate 5, and an upper movable block 12 is slidably provided on the upper rail. The middle bracket plate 5 is also provided with an upper seat 29 and an electromagnetic block 13 with strong magnetism after power is turned on. The electromagnetic block 13 is located between the upper rail 11 and the central axis 2, and 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. 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 through two sets of symmetrical connecting rods 15. After the upper movable block 12 approaches the upper seat, the two connecting rods 15 push the two frame blocks 7 to separate from each other until the driving wheel 9 is tightly fitted with the axle wheel 10.

[0040] Because the start and stop switches of the electromagnetic block 13 are synchronized with the start and stop switches 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 a 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 one side of the electromagnetic block 13. 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. In this way, the shaft wheel 10 here will not be interfered with by the driving wheel 9 during the rotation of the turntable 3.

[0041] Figure 4 and Figure 5 The two frames 7 are shown in the separated and closed states respectively.

[0042] 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 provided on the first frame 71. A square rod is fixed on the second frame 72, and 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 no external force is applied, the outward push spring 16 causes the second frame 72 to have a tendency to bounce away from the first frame 71. The first frame 71 is slidably connected to the frame rail 6, and an axial hole is provided on the second frame 72.

[0043] The outward push spring 16 has two functions: one is to enable the driving wheel 9 to fit tightly on the shaft wheel 10 normally, because the driving shaft 8 is arranged in the shaft hole of the second frame 72, so after shifting the first frame 71, the driving shaft 8 can fit tightly on the shaft wheel 10, reducing the possibility of slipping; the second is to provide another safety measure to prevent the driving wheel 9 from interfering with the movement of the shaft wheel 10. In addition to using the electromagnetic block 13 to adsorb the upper movable block 12 and eventually make the driving wheel 9 retreat, if there is still a slight interference situation, the outward push spring 16 can retract, and the direct movement of the shaft wheel 10 will also squeeze the driving wheel 9 to make the driving wheel 9 give way.

[0044] 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.

[0045] 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, and a power motor is arranged in the lower movable block 30. The output end fixed sleeve of the power motor is provided with an output wheel 20, and the bottom end fixed sleeve of the drive shaft 8 is provided with an input wheel 21 in the same plane as the output wheel 20. A belt 22 is provided in the tensioning sleeve between the input wheel 21 and the output wheel 20 of the two drive shafts 8, and a tensioning spring 23 is provided between the lower seat 18 and the lower movable block. The tensioning spring pushes the lower movable block away from the lower seat 18 until the belt 22 is tightened.

[0046] The lower rail 19 is in an inverted "T" shape, and a T-shaped slot matching the size of the lower rail 19 is provided on the lower movable block, and the T-shaped slot is butted against the lower rail 19.

[0047] The constraint structure is an annular groove opened on the outer edge of the middle of the shaft hole and a circular ring fixed on the outer edge of the driving shaft 8. The circular ring is consistent in size with the annular groove and is located in the annular groove.

[0048] like Figure 2 As shown, the turntable 3 is made of non-magnetic material, and six magnetic positioning bodies 24 are symmetrically provided on the outer edge of the turntable 3. The base 1 is provided with an electromagnet 25 with strong magnetism when powered on.

[0049] When the electromagnet 25 is energized, it will absorb the nearest positioning body 24, causing the positioning body 24 to shift to a 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. Each time the workstation switch is completed, the electromagnet 25 is energized to absorb the nearest positioning body 24, causing the positioning body 24 to be completely in a specific position closest to the electromagnet 25. This is equivalent to completing secondary positioning, which makes the positioning accuracy higher.

[0050] 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.

[0051] 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. The grinding head will automatically fall and stick to the workbench when it is sleeved on the top of the vertical rod 26. Moreover, 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 vertical rod 26 can then play a restrictive role on the grinding head.

[0052] like Figure 2 As shown, a placement groove 27 having the same dimensions 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.

[0053] 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.

[0054] 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 .

[0055] 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 workstation connected to it will not fall off from the turntable 3.

[0056] The bottom of the workbench is equipped with an electromagnetic plate which has strong magnetism when powered on.

[0057] Considering that most grinding heads are made of metal, the strong magnetism generated when the electromagnetic plate is energized can firmly adsorb the grinding head, so that the grinding head can be fixed on the workbench.

[0058] Each rotating connection of the turntable assembly is provided with a bearing.

[0059] It should be understood that in the claims and description of the present invention, all "including..." should be understood as open-ended, that is, its meaning is equivalent to "at least containing...", and should not be understood as closed-ended, that is, its meaning should not be understood as "only including...".

[0060] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A positioning turntable assembly for an electric grinder and polisher, characterized by: 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 in clockwise order: loading station, positive polishing station, flipping station, reverse polishing station, unloading station, and positioning station; 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 provided 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; a middle bracket plate is provided at the middle height of the base cavity, and a bracket plate is provided in the base cavity for driving the workstations in the positive polishing station and the reverse polishing station. The fixed-point driving part for the main shaft rotation of the position, the fixed-point driving part includes a frame rail fixedly arranged in the base laterally, two sets of frame blocks slidably symmetrically arranged on the frame rail and with axial holes in the vertical direction, and two driving shafts freely rotating in the axial holes of the two frame blocks, and an anti-separation constraint structure is provided between the driving shaft and the axial hole, the top fixed sleeve of the driving shaft is provided with a driving wheel, and the bottom fixed sleeve of the main shaft is provided with an axial wheel in the same plane as the driving wheel. When the main shaft rotates to the positive polishing station and the reverse polishing station with the turntable, the axial wheel at this location is fitted with the driving wheel, and a power component is provided at the bottom end of the driving shaft; an upper rail is fixedly provided longitudinally above the middle bracket plate, and an upper movable block is slidably provided on the upper rail. The middle bracket plate is also provided with an upper seat and an electromagnetic block with strong magnetism after power is turned on. 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. 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 it is energized 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, and a second hinge shaft is provided on the upper movable block. The two first hinge shafts and the second hinge shafts on the two frame blocks are connected through two sets of symmetrical connecting rods. 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 is tightly fitted with the shaft wheel; the frame block comprises a first frame and a second frame, the first frame is provided with a square hole with a square cross-section, and the second frame is fixed with a square rod. The rod is movably embedded in the square hole, and an outward push spring is provided between the first frame and the second frame. When no external force is applied, the outward push spring causes the second frame to have a tendency to bounce away from the first frame. The first frame is slidably connected to the frame rail, and the shaft hole is provided on the second frame; the power component includes a driven wheel fixedly sleeved at the bottom of the driving shaft, a lower seat and a lower rail fixed to 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 provided in the lower movable block. The output end fixed sleeve of the power motor is provided with an output wheel, and the bottom end fixed sleeve of the driving shaft is provided with an input wheel coplanar with the output wheel. A belt is tightened between the input wheel and the output wheel 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;The bottom surface of the workstation is provided with an electromagnetic plate which has strong magnetism when powered on.

2. The positioning turntable assembly of an electric grinder and polisher according to claim 1, characterized in that: The restraining structure is a ring groove opened on the outer edge of the middle of the shaft hole and a ring fixed on the outer edge of the driving shaft. The ring is consistent in size with the ring groove and is located in the ring groove.

3. The 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 on the outer edge of the turntable. An electromagnet with strong magnetism when powered on is arranged on the base.

4. The 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 upper end of the vertical pole is provided with an oblique rounded corner.

5. The positioning turntable assembly of an electric grinder and polisher according to claim 1, characterized in that: A placement groove having the same size as the outer contour of the grinding head is provided 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.

6. The 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 with a spacing consistent with the thickness of the turntable, and the turntable is located between the two groups of limiting plates.

Images