Quartz plate polishing production line

Abstract

The present application relates to a kind of quartz plate polishing production line, including belt conveyor, polishing machine base, polishing machine base is across in belt conveyor, polishing machine base is installed with rotary platform and servo motor, motor shaft of servo motor is transmission connection with rotary platform by gear transmission mechanism;Rotary platform is installed with N drive motor, polishing head is installed on the motor shaft of drive motor, positioning mechanism, blocking mechanism, injection mechanism are installed on belt conveyor.Polishing head is rotated according to circular route by rotary platform, so that each polishing head has an opportunity of partial suspension cleaning in each rotation, to prevent the accumulation of debris adhered to the bottom of polishing head from affecting the polishing effect of polishing head;Avoid relative movement between quartz plate and the conveying belt of belt conveyor during polishing process, ensure that quartz plate passes through the bottom of polishing head smoothly according to the conveying speed of belt conveyor, so that it is polished regularly by polishing head.

Description

Technical Field

[0001] This invention relates to the field of quartz slab processing equipment, and more particularly to a quartz slab polishing production line. Background Technology

[0002] Quartz slabs are made by mixing, spreading, and molding various powdered and crushed raw materials into quartz slab blanks. The quartz slab blanks are then cut, thickness-determined, and polished to obtain the finished product. Among these processes, polishing is a crucial step in determining the surface quality of quartz slabs.

[0003] Existing polishing production lines mainly consist of multiple polishing machines arranged in a rectangular array hinged to a crossbeam that moves back and forth along the width of the quartz slab. These polishing machines are driven by motors and connecting rods to oscillate relative to the crossbeam. While this ensures that the polishing machines travel evenly on the quartz slab, the polishing heads are always in contact with the quartz slab during polishing. The polishing debris generated by the machines adheres to the bottom of the polishing heads, affecting the normal polishing effect. Furthermore, the movement of the crossbeam and the oscillation of the polishing machines can easily cause relative movement between the quartz slab and the conveying equipment, resulting in the quartz slab deviating from its designated path on the conveying equipment. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned problems in the prior art and provide a quartz plate polishing production line.

[0005] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0006] A quartz slab polishing production line includes a belt conveyor and a gantry-type polishing machine base. The width of the belt conveyor is greater than the width of the quartz slab. The polishing machine base spans the belt conveyor. A rotary platform and a servo motor driving the rotary platform are mounted on the polishing machine base. The motor shaft of the servo motor is connected to the rotary platform via a gear transmission mechanism. The rotation angle of the rotary platform is 180° to 240°. N drive motors arranged in a circular array are mounted on the rotary platform. N is a positive integer greater than 1. A disc-shaped polishing head is mounted on the motor shaft of the drive motor. The diameter of the circle corresponding to the outer side of the fan-shaped annular surface swept by the polishing head when the rotary platform rotates is equal to the sum of the width of the conveyor belt of the belt conveyor and the diameter of one polishing head. The left and right sides of the rotary platform are equidistant from the conveyor belt of the belt conveyor. The belt conveyor is equipped with a positioning mechanism to prevent the quartz plate from slipping on the conveyor belt, a blocking mechanism to intercept the quartz plate, and a spraying mechanism to spray fluid onto the polishing head.

[0007] The polishing machine base includes two pairs of first support legs arranged on the left and right sides of the belt conveyor, two parallel first I-beams, four symmetrical lifting blocks, two parallel second I-beams, and two parallel third I-beams. A first I-beam is welded to the top of each pair of first support legs. A support screw is vertically welded to the top of each first I-beam directly above the first support leg. Each support screw is sequentially screwed with a lower anti-loosening nut, a lower height adjusting nut, an upper height adjusting nut, and an upper anti-loosening nut from bottom to top. The lifting block is fitted onto the support screw between the lower and upper height adjusting nuts. The second I-beam is installed between two symmetrical lifting blocks. Two third I-beams are welded between the two second I-beams. A support plate is welded to the top of the second and third I-beams, and a circular through hole is opened in the center of the support plate. The end of the lifting block connected to the second I-beam is provided with a slot with a longitudinal section of "⊥". The end of the second I-beam is inserted into the slot, and the second I-beam and the lifting block are fastened with bolts.

[0008] The rotary platform includes a rotary support bearing and a circular mounting plate. The outer bearing ring of the rotary support bearing is mounted on the top of the support plate, and the mounting plate is mounted on the top of the inner bearing ring of the rotary support bearing. The mounting plate is provided with N recessed bearing mounting cylinders. The drive motor is mounted on the mounting plate, and the motor shaft of the drive motor passes through the bearing mounting cylinders from top to bottom. A ball bearing is installed in the bottom of the bearing mounting cylinder, and the lower part of the motor shaft of the drive motor is fitted in the inner ring of the ball bearing.

[0009] The inner diameter of the slewing bearing is greater than the distance between the two second I-beams, and the inner diameter of the slewing bearing is greater than the distance between the two third I-beams.

[0010] The gear transmission mechanism includes an external gear ring mounted on the top of the mounting plate and a gear mounted on the motor shaft of the servo motor. The gear meshes with the external gear ring, and the total tooth height of the gear is 4 to 6 centimeters greater than that of the external gear ring. When the bottom end of the polishing head contacts the belt conveyor, the root circle of the gear and the root circle of the external gear ring are on the same plane.

[0011] The positioning mechanism includes a first connecting rod, a second connecting rod, a first connecting block, a second connecting block, a first connecting plate, and a second connecting plate. The tail ends of the first connecting rod and the first connecting plate are perpendicularly welded to the same side of the first connecting block, and the tail ends of the second connecting rod and the second connecting plate are perpendicularly welded to the same side of the second connecting block. The conveyor belt of the belt conveyor has several evenly distributed, through-holes. The first connecting rod and the second connecting rod are inserted into the holes from opposite ends. The head of the first connecting rod has a pin hole. The head of the second connecting rod is provided with a pin, which is engaged with a pin hole; the head of the first connecting plate is provided with an upper extension head extending along the long axis of the first connecting plate, and the head of the second connecting plate is provided with a lower extension head extending along the long axis of the second connecting plate. The upper extension head and the lower extension head overlap vertically and are connected by multiple countersunk screws; a guide block facing the conveying direction of the belt conveyor is fixed to the first connecting plate and the second connecting plate respectively. The guide block is a right trapezoid in top view, and the inclined surfaces of the two guide blocks are arranged face to face.

[0012] The blocking mechanism includes two vertically welded columns to the top of the belt conveyor frame, a first rotating shaft, and a second rotating shaft. The two ends of the first rotating shaft are rotatably installed in the shaft holes at the top of the two columns. Multiple evenly distributed baffles are welded to the bottom of the first rotating shaft. A torsion spring is fitted at each end of the first rotating shaft, and the two ends of the torsion spring are fixed to the baffles and columns, respectively. The second rotating shaft is installed at the bottom of the baffles. A roller is rotatably installed on the second rotating shaft between any two baffles. The bottom end of the roller is lower than the bottom end of the baffle, and the diameter of the roller is greater than the thickness of the baffle.

[0013] The spraying mechanism includes a pipe for conveying fluid, a first nozzle for spraying fluid onto a polishing head that has moved to the side of the belt conveyor, and a second nozzle for spraying fluid onto the polishing head that has moved to the middle of the belt conveyor. The pipe is fixed to the top of the frame of the belt conveyor with pipe clamps, and the first and second nozzles are respectively installed on the pipe.

[0014] The first nozzle and the second nozzle are both side-spray water curtain nozzles with a fan-shaped fluid ejection shape.

[0015] The first nozzle and the second nozzle are both air knives, and the effective length of the air outlet of the air knife is greater than the diameter of the polishing head.

[0016] The beneficial effects of this invention are as follows: the rotary platform causes the polishing head to rotate along an arc-shaped path, allowing each polishing head to have a partial suspension cleaning opportunity in each rotation, preventing the accumulation of debris at the bottom of the polishing head from affecting the polishing effect; the blocking mechanism and positioning mechanism work together to hold the quartz plate between two guide blocks, preventing relative movement between the quartz plate and the conveyor belt of the belt conveyor during the polishing process, ensuring that the quartz plate passes smoothly under the polishing head at the conveyor speed of the belt conveyor, and is thus polished regularly by the polishing head. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the quartz plate polishing production line in this invention;

[0019] Figure 2 This is a front-view plan view of the quartz plate polishing production line in this invention.

[0020] Figure 3 This is a first-view perspective three-dimensional structural diagram of the combination of polishing machine base, rotary platform, drive motor, gear transmission mechanism and polishing head in this invention;

[0021] Figure 4 This is a second-view three-dimensional structural diagram of the combination of polishing machine base, rotary platform, drive motor, gear transmission mechanism and polishing head in this invention;

[0022] Figure 5 This is a side view of the planar structure of the polishing machine base, rotary platform, drive motor, gear transmission mechanism, and polishing head assembly in this invention.

[0023] Figure 6 This is a schematic diagram of the mounting plate in this invention;

[0024] Figure 7 This is a schematic diagram of the lifting block in this invention;

[0025] Figure 8 This is a schematic diagram of the structure of the positioning mechanism and the conveyor belt combination in this invention;

[0026] Figure 9 This is a schematic diagram of the positioning mechanism in this invention;

[0027] Figure 10 This is a schematic diagram of the structure of the first connecting rod, the first connecting block, and the first connecting plate combined in this invention;

[0028] Figure 11 This is a schematic diagram of the structure of the second connecting rod, the second connecting block, and the second connecting plate combined in this invention;

[0029] Figure 12 This is a schematic diagram of the blocking mechanism in this invention;

[0030] Figure 13 This is a schematic diagram of the injection mechanism in this invention;

[0031] Explanation of the numbers in the diagram: Quartz plate 100, Belt conveyor 1, Gantry polishing machine base 2, Conveyor belt 3, First support leg 4, First I-beam 5, Lifting block 6, Second I-beam 7, Third I-beam 8, Support screw 9, Lower anti-loosening nut 10, Lower height adjusting nut 11, Upper height adjusting nut 12, Upper anti-loosening nut 13, Support plate 14, Slot 15, Servo motor 16, Rotary support bearing 17, Mounting plate 18, External gear ring 19, Gear 20, Motor frame 21, Thrust ball bearing 22, Drive motor 23, Bearing Mounting cylinder 24, ball bearing 25, polishing head 26, positioning mechanism 27, first connecting rod 28, second connecting rod 29, first connecting block 30, second connecting block 31, first connecting plate 32, second connecting plate 33, insertion hole 34, pin hole 35, pin post 36, upper extension head 37, lower extension head 38, countersunk screw, guide block 39, blocking mechanism 40, column 41, first rotating shaft 42, second rotating shaft 43, baffle 44, torsion spring 45, roller 46, spraying mechanism 47, pipe 48, first nozzle 49, second nozzle 50. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figure 1 As shown, a quartz slab polishing production line includes a belt conveyor 1 and a gantry-shaped polishing machine base 2. The width of the conveyor belt 3 of the belt conveyor 1 is greater than the width of the quartz slab 100, and the polishing machine base 2 spans across the belt conveyor 1.

[0034] The polishing machine base 2 includes two pairs of first support legs 4 arranged on the left and right sides of the belt conveyor 1, two parallel first I-beams 5, four symmetrical lifting blocks 6, two parallel second I-beams 7, and two parallel third I-beams 8. A first I-beam 5 is welded to the top of each pair of first support legs 4. A support screw 9 is vertically welded to the top of each first support leg 4, so that the force center of the support screw 9 and the force center of the first support leg 4 are on the same vertical line.

[0035] Each support screw 9 is sequentially screwed with a lower anti-loosening nut 10, a lower height adjusting nut 11, an upper height adjusting nut 12, and an upper anti-loosening nut 13 from bottom to top. The lifting block 6 is fitted onto the support screw 9 between the lower height adjusting nut 11 and the upper height adjusting nut 12. By rotating the lower anti-loosening nut 10, the lower height adjusting nut 11, the upper height adjusting nut 12, and the upper anti-loosening nut 13, the height of the lifting block 6 on the support screw 9 can be adjusted, thereby making this quartz plate polishing production line suitable for quartz plates 100 of different thicknesses.

[0036] The second I-beam 7 is installed between two symmetrical lifting blocks 6. Two third I-beams 8 are welded between the two second I-beams 7. A support plate 14 is welded to the top of the second I-beam 7 and the third I-beam 8. A circular through hole is opened in the center of the support plate 14.

[0037] The end of the lifting block 6 connected to the second I-beam 7 is provided with a slot 15 with a longitudinal section of "⊥". The end of the second I-beam 7 is inserted into the slot 15, so that the lifting block 6 supports the wing plate at the bottom of the second I-beam 7, thereby increasing the supporting force of the lifting block 6 on the second I-beam 7 and preventing the end of the second I-beam 7 from being torn by fasteners. The second I-beam 7 and the lifting block 6 are fastened with bolts.

[0038] The polishing base 2 is equipped with a rotary platform and a servo motor 16 that drives the rotary platform to rotate. The motor shaft of the servo motor 16 is connected to the rotary platform through a gear transmission mechanism. The rotation angle of the rotary platform is 180° to 240°.

[0039] The slewing platform includes a slewing support bearing 17 and a circular mounting plate 18. The outer bearing ring of the slewing support bearing 17 is mounted on the top of the support plate 14, and the mounting plate 18 is mounted on the top of the inner bearing ring of the slewing support bearing 17.

[0040] The inner diameter of the slewing bearing 17 is greater than the distance between the two second I-beams 7 and the distance between the two third I-beams 8, ensuring that the pressure applied by the slewing bearing 17 is borne by the two second I-beams 7 and the two third I-beams 8, thus preventing the mounting plate 18 from deforming.

[0041] The gear transmission mechanism includes an external gear ring 19 mounted on the top of the mounting plate 18 and a gear 20 mounted on the motor shaft of the servo motor 16. The gear 20 meshes with the external gear ring 19. The total tooth height of the gear 20 is 4 to 6 centimeters greater than that of the external gear ring 19. When adjusting the height of the lifting block 6, it is necessary to ensure that the outer teeth of the external gear ring 19 are fully engaged with the gear 20. That is, the root circle of the gear 20 must always be lower than the root circle of the external gear ring 19, and the tip circle of the gear 20 must always be higher than the tip circle of the external gear ring 19.

[0042] A portal-shaped motor frame 21 is installed at the top of one of the first I-beams 5. The servo motor 16 is installed in the motor frame 21. A thrust ball bearing 22 is installed at the top of the motor frame 21. The bottom end of the gear 20 contacts the top end of the thrust ball bearing 22. The thrust ball bearing 22 provides axial support for the gear 20, thereby reducing the axial pressure on the motor shaft of the servo motor 16.

[0043] Six drive motors 23 are installed on the rotary platform in a circular array. Specifically, six recessed bearing mounting sleeves 24 are provided on the mounting plate 18. The drive motors 23 are mounted on the mounting plate 18, and the motor shafts of the drive motors 23 pass through the bearing mounting sleeves 24 from top to bottom. Ball bearings 25 are installed in the bottom of the bearing mounting sleeves 24, and the lower part of the motor shaft of the drive motor 23 is fitted in the inner ring of the ball bearing 25, which improves the stability of the motor shaft when the drive motor 23 is working and prevents radial vibration of the motor shaft of the drive motor 23.

[0044] A disc-shaped polishing head 26 is mounted on the motor shaft of the drive motor 23. When the polishing head 26 rotates with the rotary platform, the diameter of the circle corresponding to the outer side of the fan-shaped annular surface swept by the polishing head 26 is equal to the sum of the width of the conveyor belt 3 of the belt conveyor 1 and the diameter of one polishing head 26. Furthermore, the distance between the left and right sides of the rotary platform and the conveyor belt 3 of the belt conveyor 1 is the same. This ensures that when the polishing head 26 rotates with the rotary platform, each polishing head 26 is partially suspended outside the conveyor belt 3 of the belt conveyor 1 for a period of time. In other words, each polishing head 26 is partially separated from the quartz plate 100 for a period of time. This allows for the cleaning of the bottom end of the polishing head 26, reducing the adhesion of polishing powder to the bottom end of the polishing head 26.

[0045] When the bottom end of the polishing head 26 contacts the belt conveyor 1, the root circle of the gear 20 and the root circle of the external gear ring 19 are on the same plane.

[0046] The rotary platform drives the drive motor and polishing head 26 to make a circular reciprocating motion, so that the polishing head 26 moves back and forth on the surface of the quartz plate 100 along a circular path spanning the left and right sides of the quartz plate 100, so that each polishing wheel 26 can perform comprehensive and uniform polishing on the surface of the quartz plate 100.

[0047] The belt conveyor 1 is equipped with a positioning mechanism 27 to prevent the quartz plate 100 from slipping on the conveyor belt 3. Specifically, the positioning mechanism 27 includes a first connecting rod 28, a second connecting rod 29, a first connecting block 30, a second connecting block 31, a first connecting plate 32, and a second connecting plate 33. The tail ends of the first connecting rod 28 and the first connecting plate 30 are perpendicularly welded to the same side of the first connecting block 32, and the tail ends of the second connecting rod 29 and the second connecting plate 31 are perpendicularly welded to the same side of the second connecting block 33. The conveyor belt 3 of the belt conveyor 1 is provided with a plurality of evenly distributed left-right through-holes 34. The first connecting rod 28 and the second connecting rod 29 are inserted into the insertion hole 34 from both ends of the insertion hole 34, respectively. The head of the first connecting rod 28 is provided with a pin hole 35, and the head of the second connecting rod 29 is provided with a pin post 36. The pin post 36 is engaged with the pin hole 35. The head of the first connecting plate 32 is provided with an upper extension head 37 extending along the long axis of the first connecting plate 32, and the head of the second connecting plate 33 is provided with a lower extension head 38 extending along the long axis of the second connecting plate 33. The upper extension head 37 and the lower extension head 38 are overlapped and connected by multiple countersunk screws, which facilitates the installation of the positioning mechanism 27 onto the conveyor belt 3 of the belt conveyor 1.

[0048] A guide block 39 facing the conveying direction of the belt conveyor 1 is fixed to the first connecting plate 32 and the second connecting plate 33 respectively. The guide block 39 is a right trapezoid in top view, and the inclined surfaces of the two guide blocks 39 are arranged face to face. The spacing between the two guide blocks 39 is customized according to the width of the quartz plate 100 to be polished. The thickness of the guide block 39, the first connecting plate 32, and the second connecting plate 33 is less than the thickness of the quartz plate 100 to be polished, so as to ensure that the guide block 39, the first connecting plate 32, and the second connecting plate 33 do not contact the polishing head and prevent the guide block 39, the first connecting plate 32, and the second connecting plate 33 from being polished and worn. One end of the quartz plate 100 is held between two guide blocks 39 to ensure that the quartz plate 100 will not move left or right or rotate on the belt conveyor 1 when it is being polished by the polishing head 26; to prevent the quartz plate 100 from slipping on the belt conveyor 1 when there is lubricating liquid between the quartz plate 100 and the belt conveyor 1; and to ensure that the quartz plate 100 passes smoothly under the polishing head 26 at the conveying speed of the belt conveyor 1, so that it can be polished regularly by the polishing head 26.

[0049] The belt conveyor 1 is also equipped with a blocking mechanism 40 for intercepting the quartz plate 100. The blocking mechanism 40 includes two columns 41 vertically welded to the top of the frame of the belt conveyor 1, a first rotating shaft 42, and a second rotating shaft 43. The two ends of the first rotating shaft 42 are respectively rotatably installed in the shaft holes at the top of the two columns 41. Multiple evenly distributed baffles 44 are welded to the bottom of the first rotating shaft 42. A torsion spring 45 is fitted on each end of the first rotating shaft 42. The two ends of the torsion spring 45 are respectively fixed to the baffles 44 and the columns 41. The second rotating shaft 43 is installed at the bottom of the baffles 44. A roller 46 is rotatably installed on the second rotating shaft 43 between any two baffles 44. The bottom end of the roller 46 is lower than the bottom end of the baffle 44, and the diameter of the roller 46 is greater than the thickness of the baffle 44. Before the quartz plate 100 is engaged between the two guide blocks 39 of the positioning mechanism 27, the blocking mechanism 40 temporarily blocks the quartz plate 100 as it is mounted on the belt conveyor 1. At this time, relative sliding occurs between the quartz plate 100 and the conveyor belt 3 of the belt conveyor 1. When the quartz plate 100 is engaged between the two guide blocks of the positioning mechanism 27, the quartz plate 100 is pushed by the first connecting plate 32 and the second connecting plate 33, thereby pushing the baffle 44 to rotate in the conveying direction of the belt conveyor 1 until the roller 46 rolls at the top of the quartz plate 100.

[0050] The belt conveyor 1 is also equipped with a jetting mechanism 47 for spraying fluid onto the polishing head 26. The jetting mechanism includes a pipe 48 for conveying fluid, a first nozzle 49 for spraying fluid onto the polishing head that has moved to the side of the belt conveyor and directly above it, and a second nozzle 50 for spraying fluid onto the polishing head that has moved to the middle of the belt conveyor and above it. The pipe 48 is fixed to the top of the frame of the belt conveyor 1 with pipe clamps, and the first nozzle 49 and the second nozzle 50 are respectively installed on the pipe 48.

[0051] When wet polishing is used, both the first and second nozzles are side-spray water curtain nozzles with a fan-shaped fluid ejection shape. Water is used as the fluid and is delivered to the first and second nozzles through pipes. The fan-shaped water curtain sprayed from the first nozzle washes the bottom of the polishing head that is separated from the quartz slab, washing away the debris generated during polishing, thereby ensuring that the bottom of the polishing head can be polished normally. The fan-shaped water curtain sprayed from the second nozzle sprays the area of ​​the polishing head in contact with the quartz slab. This serves two purposes: first, to reduce the temperature of the polishing head and prevent it from burning out; and second, to wash away the debris generated during polishing around the polishing head, reducing obstacles in the direction of the polishing head's movement as the rotary platform rotates.

[0052] To prevent water from flowing freely on the ground, a collection trough is built around the belt conveyor and polishing machine base, and the collection trough is connected to the factory's wastewater recycling system so that the wastewater generated during polishing can be collected and discharged into the wastewater recycling system for treatment.

[0053] Example 2 differs from Example 1 in that, when dry polishing is used, both the first and second nozzles are air knives, and the effective length of the air knife's outlet is greater than the diameter of the polishing head. Clean compressed air is used as the circulating air and is delivered to the first and second nozzles through a pipeline. The airflow ejected from the first nozzle blows away the bottom of the polishing head, which is separated from the quartz plate, removing the debris generated during polishing and ensuring that the bottom of the polishing head can be polished normally. The airflow ejected from the second nozzle blows away the area of ​​the polishing head in contact with the quartz plate, firstly to reduce the temperature of the polishing head and prevent it from burning out, and secondly to blow away the debris generated during polishing around the polishing head, reducing obstacles in the direction of the polishing head's movement as the rotary platform rotates.

[0054] To prevent dust-laden air from spreading freely in the workshop, a dust collection hood is built around the polishing machine base, and a vacuum cleaner is installed on the dust collection hood to extract the debris and air used during polishing, purify them, and then discharge them.

[0055] In addition to the 6 motors used in the above embodiments, the number of drive motors installed on the rotary platform can also be 2, 3, 4, 5, 8, 12, or any integer greater than 1.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A quartz slab polishing production line, characterized in that: The system includes a belt conveyor and a gantry-type polishing machine base. The width of the belt conveyor is greater than the width of the quartz slab. The polishing machine base spans across the belt conveyor. A rotary platform and a servo motor driving the rotary platform are mounted on the polishing machine base. The motor shaft of the servo motor is connected to the rotary platform via a gear transmission mechanism. The rotation angle of the rotary platform is 180°~240°. N drive motors, arranged in a circular array, are mounted on the rotary platform. N is a positive integer greater than 1. A disc-shaped polishing head is mounted on the motor shaft of each drive motor. The diameter of the circle corresponding to the outer edge of the fan-shaped annular surface swept by the polishing head as the rotary platform rotates is equal to the sum of the width of the belt conveyor and the diameter of one polishing head. The distance between the left and right sides of the rotary platform and the belt conveyor is the same. The belt conveyor is equipped with a positioning mechanism to prevent the quartz slab from slipping on the conveyor belt, a blocking mechanism to intercept the quartz slab, and a spraying mechanism to spray fluid onto the polishing head. The positioning mechanism includes a first connecting rod, a second connecting rod, a first connecting block, a second connecting block, a first connecting plate, and a second connecting plate. The tail ends of the first connecting rod and the first connecting plate are perpendicularly welded to the same side of the first connecting block, and the tail ends of the second connecting rod and the second connecting plate are perpendicularly welded to the same side of the second connecting block. The conveyor belt of the belt conveyor has several evenly distributed, through-holes. The first connecting rod and the second connecting rod are inserted into the holes from opposite ends. The head of the first connecting rod has a pin hole, and the head of the second connecting rod has a pin. The pin engages with the pin hole. The head of the first connecting plate has an upper extension extending along its long axis, and the head of the second connecting plate has a lower extension extending along its long axis. The upper and lower extensions overlap vertically and are connected by multiple countersunk screws. A guide block facing the conveying direction of the belt conveyor is fixed to both the first and second connecting plates. The guide block is a right-angled trapezoid in its top view, and the inclined surfaces of the two guide blocks are arranged face-to-face. The blocking mechanism includes two vertically welded columns to the top of the belt conveyor frame, a first rotating shaft, and a second rotating shaft. The two ends of the first rotating shaft are rotatably mounted in shaft holes at the top of the two columns. Multiple evenly distributed baffles are welded to the bottom of the first rotating shaft. A torsion spring is fitted onto each end of the first rotating shaft, and the two ends of the torsion spring are fixed to the baffles and columns, respectively. The second rotating shaft is mounted on the bottom of the baffles. A roller is rotatably mounted on the second rotating shaft between any two baffles. The bottom end of the roller is lower than the bottom end of the baffle, and the diameter of the roller is greater than the thickness of the baffle. The spraying mechanism includes a conduit for conveying fluid, a first nozzle for spraying fluid onto a polishing head that has moved to the side of the belt conveyor and directly above it, and a second nozzle for spraying fluid onto the polishing head that has moved to the center of the belt conveyor and above it.

2. The quartz slab polishing production line according to claim 1, characterized in that: The polishing machine base includes two pairs of first support legs arranged on the left and right sides of the belt conveyor, two parallel first I-beams, four symmetrical lifting blocks, two parallel second I-beams, and two parallel third I-beams. A first I-beam is welded to the top of each pair of first support legs. A support screw is vertically welded to the top of each first I-beam directly above the first support leg. Each support screw is sequentially screwed with a lower anti-loosening nut, a lower height adjusting nut, an upper height adjusting nut, and an upper anti-loosening nut from bottom to top. The lifting block is fitted onto the support screw between the lower height adjusting nut and the upper height adjusting nut. The second I-beam is installed between two symmetrical lifting blocks. Two third I-beams are welded between the two second I-beams. A support plate is welded to the top of the second and third I-beams. A circular through hole is opened in the center of the support plate. A slot with a "⊥" shaped longitudinal section is provided at the end of the lifting block connected to the second I-beam. The end of the second I-beam is inserted into the slot. The second I-beam and the lifting block are fastened with bolts.

3. The quartz slab polishing production line according to claim 2, characterized in that: The rotary platform includes a rotary support bearing and a circular mounting plate. The outer bearing ring of the rotary support bearing is mounted on the top of the support plate, and the mounting plate is mounted on the top of the inner bearing ring of the rotary support bearing. The mounting plate is provided with N recessed bearing mounting cylinders. The drive motor is mounted on the mounting plate, and the motor shaft of the drive motor passes through the bearing mounting cylinders from top to bottom. A ball bearing is installed in the bottom of the bearing mounting cylinder, and the lower part of the motor shaft of the drive motor is fitted in the inner ring of the ball bearing.

4. The quartz slab polishing production line according to claim 3, characterized in that: The inner diameter of the slewing bearing is greater than the distance between the two second I-beams, and the inner diameter of the slewing bearing is greater than the distance between the two third I-beams.

5. The quartz slab polishing production line according to claim 3, characterized in that: The gear transmission mechanism includes an external gear ring mounted on the top of the mounting plate and a gear mounted on the motor shaft of the servo motor. The gear meshes with the external gear ring, and the total tooth height of the gear is 4-6 cm greater than that of the external gear ring. When the bottom end of the polishing head contacts the belt conveyor, the root circle of the gear and the root circle of the external gear ring are on the same plane.

6. The quartz slab polishing production line according to claim 1, characterized in that: The pipe is fixed to the top of the belt conveyor frame with pipe clamps, and the first nozzle and the second nozzle are respectively installed on the pipe.

7. The quartz slab polishing production line according to claim 6, characterized in that: Both the first nozzle and the second nozzle are side-spray water curtain nozzles with a fan-shaped fluid ejection shape.

8. The quartz slab polishing production line according to claim 6, characterized in that: Both the first nozzle and the second nozzle are air knives, and the effective length of the air outlet of the air knife is greater than the diameter of the polishing head.

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