Carbon fiber polishing dustproof and explosion-proof rotary table and use method thereof

Abstract

The application discloses a carbon fiber polishing dustproof and explosion-proof rotary table, which comprises a rotary table base, a table top, a dust suction pipeline, a positive pressure maintaining system, wherein the table top and the rotary table base form a containing space; the middle part of the dust suction pipeline is arranged in the containing space, one end of the dust suction pipeline is connected to the upper surface of the table top from below of the table top to form an opening; the positive pressure maintaining system comprises a cable sealing element, a pressure regulating valve, a pressure detection switch and an air outlet pipe; the cable sealing element is arranged on the rotary table base and is connected with an external gas providing device; the gas passes through the cable sealing element, the pressure regulating valve, the pressure detection switch and the air outlet pipe in sequence to enter the containing space; wherein the pressure regulating valve adjusts the pressure of the external gas passing through the pressure regulating valve, and the pressure detection switch detects the pressure difference between the internal pressure of the containing space and the atmospheric pressure. The application has a central dust suction pipeline, can continuously remove dust during polishing of workpieces, and has the positive pressure maintaining system, so that an expensive explosion-proof motor is not needed.

Description

Technical Field

[0001] This invention relates to the technical field of dustproof and explosion-proof rotary tables for carbon fiber grinding, and particularly to a dustproof and explosion-proof rotary table for carbon fiber grinding and its usage method. Background Technology

[0002] Carbon fiber parts often require grinding and finishing, which generates a large amount of fine dust. On one hand, this dust can enter the gaps in the equipment, affecting the service life of mechanical parts; on the other hand, when the dust mixes with air, it produces flammable aerosols, which, when accumulated to a certain concentration, pose an explosion hazard. Therefore, equipment used for carbon fiber grinding, such as turntables for clamping workpieces, requires additional measures to prevent hazards caused by dust particles and flammable aerosols.

[0003] In existing technologies, rotary tables generally only have a sealed design and lack dust extraction capabilities. Therefore, carbon fiber dust cannot be removed from the processing environment during grinding, and accumulated dust interferes with the process and pollutes the workshop environment. Currently, the common practice for dust removal is to add external dust extraction equipment. However, adding external dust extraction equipment is unsuitable in some situations. For example, when grinding the inner circle of carbon fiber parts, the inner space is inconvenient for placing the grinding head and an external dust extraction port. Furthermore, the dust generated during grinding is confined by the part's casing, reaching extremely high concentrations within the inner space, posing a risk of explosion.

[0004] Chinese utility model patent, publication number CN213529283U, discloses an explosion-proof turntable for spraying. However, this explosion-proof turntable is a multi-station turntable, suitable only for spraying small parts and unsuitable for grinding larger carbon fiber structural components. Secondly, although the turntable has explosion-proof functionality, the sealing of its key components relies solely on a single layer of rubber rings. The gearbox, relying on the table surface and a single rubber ring for sealing, cannot achieve a good sealing effect. When the rubber ring fails, the explosion-proof function is easily lost, making it unsafe in practical use. Furthermore, part of the gearbox is exposed. Although paint mist is a mixture of air and small droplets, and even if small droplets enter the gearbox through gaps, it will not seriously affect the gearbox's operation. However, during carbon fiber grinding, if solid dust seeps in through the gaps in the exposed part of the gearbox, it will severely impact the gearbox's mechanical lifespan. Therefore, this type of explosion-proof turntable used in the spraying field cannot adequately meet the needs of carbon fiber grinding.

[0005] Chinese utility model patent, publication number CN210524196U, discloses a dustproof turntable. Its dustproof function is mainly achieved through a cover and annular dust-blocking rings. The problem with this technology is that the dustproof cover is not completely sealed, and there is a large gap between the upper and lower dust-blocking rings, which only provides dust protection when the dust particles are large and low in density. If the gap between the upper and lower dust-blocking rings is reduced to improve dustproofing, it would hinder the rotation of the turntable. In carbon fiber grinding, the dust is much finer and more abundant than in cutting and processing; therefore, this technology is not well-suited for carbon fiber processing. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a dustproof and explosion-proof rotary table for carbon fiber grinding.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A dustproof and explosion-proof rotary table for carbon fiber grinding, comprising:

[0009] Turntable base;

[0010] A tabletop, which is mounted on the turntable base, and the tabletop and the turntable base together form an accommodating space;

[0011] A vacuum suction pipe is provided in the middle of the accommodating space. One end of the vacuum suction pipe is connected from the bottom of the countertop to the upper surface of the countertop to form an opening. One end of the vacuum suction pipe is connected to the center of the countertop. The other end of the vacuum suction pipe is connected to an external suction device.

[0012] A positive pressure maintaining system includes: a cable seal, a pressure regulating valve, a pressure detection switch, and a gas outlet pipe. The cable seal is mounted on the turntable base and connected to an external gas supply device. The pressure regulating valve, the pressure detection switch, and the gas outlet pipe are all located within an accommodating space. The pressure regulating valve is connected to the cable seal and the pressure detection switch. The pressure detection switch is connected to one end of the gas outlet pipe, and the other end of the gas outlet pipe is openly exposed within the accommodating space. External gas enters the accommodating space sequentially from the cable seal through the pressure regulating valve, the pressure detection switch, and the gas outlet pipe.

[0013] The pressure regulating valve adjusts the pressure of the external gas passing through it, and the pressure detection switch detects the difference between the internal pressure of the accommodating space and the atmospheric pressure.

[0014] The aforementioned dustproof and explosion-proof rotary table for carbon fiber grinding further includes a servo motor and a reducer. The servo motor is connected to the reducer, and the reducer is connected to the table surface. The servo motor drives the table surface to rotate through the reducer.

[0015] The aforementioned carbon fiber grinding dustproof and explosion-proof rotary table further includes: a pressure regulating valve isolation box, wherein the pressure regulating valve is disposed in the pressure regulating valve isolation box, and the pressure regulating valve isolation box is installed on the rotary table base.

[0016] The aforementioned carbon fiber grinding dustproof and explosion-proof rotary table includes a rotary table base comprising a detachable sealing door and anchor bolts, wherein the anchor bolts are located at the bottom of the rotary table base, and the pressure regulating valve isolation box is installed on the detachable sealing door.

[0017] The aforementioned carbon fiber grinding dustproof and explosion-proof rotary table further includes: a speed reducer mounting plate, which is disposed between the rotary table base and the table surface, the speed reducer mounting plate is mounted on the rotary table base, and the speed reducer is mounted on the speed reducer mounting plate.

[0018] The aforementioned carbon fiber grinding dustproof and explosion-proof rotary table further includes: an external sealing shell, which is disposed between the reducer mounting plate and the table surface. The external sealing shell and the reducer mounting plate are detachably connected. The external sealing shell has an annular first groove and a second groove. The first groove and the second groove respectively enclose the lower surface of the table surface to form a first sealing cavity and a second sealing cavity. The first sealing cavity is provided with a felt ring, and the second sealing cavity is provided with sealing lubricating grease, which occupies half the volume of the second sealing cavity.

[0019] The aforementioned carbon fiber grinding dustproof and explosion-proof rotary table includes a speed reducer comprising a fixed part and an output flange. The fixed part is fixedly mounted on the speed reducer mounting plate, and the output flange is connected to the table surface.

[0020] The aforementioned carbon fiber grinding dustproof and explosion-proof rotary table, wherein the dust extraction pipe includes: a movable pipe wall, an intermediate component, and a fixed pipe wall. The intermediate component connects the movable pipe wall and the fixed pipe wall. The movable pipe wall is connected to the table surface and is coaxially arranged with the table surface. The movable pipe wall rotates with the table surface. One end of the intermediate component is a sleeve structure, which is sleeved outside the movable pipe wall. The movable pipe wall rotates freely inside the intermediate component. The other end of the intermediate component is fixedly connected to the fixed pipe wall. The fixed pipe wall is fixedly connected to the turntable base and extends out of the accommodating space.

[0021] The aforementioned carbon fiber grinding dustproof and explosion-proof rotary table further includes: a clamp, which is installed on the upper surface of the table. The clamping claw has a central hole, which corresponds to the dust suction pipe. The clamp includes: a handwheel, a track, and a clamping claw. The track is arranged in a ring array around the central hole. One end of each track points to the central hole, and the other end of each track is provided with a handwheel. Each track is provided with a clamping claw, and the handwheel drives the clamping claw to move along the track.

[0022] A method of using a carbon fiber grinding dustproof and explosion-proof rotary table, wherein the method of using the aforementioned carbon fiber grinding dustproof and explosion-proof rotary table includes:

[0023] Step S1: Activate the positive pressure maintaining system. External gas enters the accommodating space from the cable seal in sequence through the pressure regulating valve, the pressure detection switch, and the gas outlet pipe.

[0024] Step S2: After the external gas fills the accommodating space, the pressure value is constant. At this time, the pressure regulating valve is adjusted to control the external gas to not enter or to enter the accommodating space at a constant flow rate, so that the value detected by the pressure detection switch is within the preset range.

[0025] Step S3: Open the vacuum pipe to form an adsorption of objects on the surface of the countertop;

[0026] Step S4: Open the worktable for processing;

[0027] Step S5: If the value detected by the pressure detection switch exceeds the preset range, the table will stop processing.

[0028] The present invention, by employing the above-mentioned technology, has the following positive effects compared with the prior art:

[0029] (1) This invention features a built-in central dust extraction pipe, which can continuously remove dust during workpiece grinding, and is especially suitable for grinding the inner circle of carbon fiber parts. It is equipped with a double seal of felt ring and sealing lubricating grease to ensure reliable and durable sealing, which can effectively improve the service life of the reducer.

[0030] (2) The present invention provides a positive pressure maintaining system, which has the functions of automatically monitoring pressure difference and manually adjusting pressure difference. It can be used normally in hazardous gas environments, including aerosols of combustible particles and combustible gases, without the need to use expensive explosion-proof motors.

[0031] (3) This invention can be used in high-dust environments containing flammable and explosive gases, such as in the grinding of carbon fiber parts. Compared to other turntables, it uses a positive pressure system to prevent external flammable gases from entering the electrical chamber, ensuring safety in flammable and explosive environments; it also has a dust extraction function to reduce dust accumulation during the grinding process. Furthermore, while balancing the requirements of turntable rotation and dust extraction, it achieves sealing of the reducer, improving the service life of the turntable in dust-rich environments. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the carbon fiber grinding dustproof and explosion-proof rotary table of the present invention.

[0033] Figure 2 This is a vertical cross-sectional view of the carbon fiber grinding dustproof and explosion-proof rotary table of the present invention.

[0034] Figure 3 This is a cross-sectional view of the carbon fiber grinding dustproof and explosion-proof rotary table of the present invention, taken from a horizontal angle and viewed from below.

[0035] Figure 4 This is a schematic diagram of the connection between the outer sealing shell and the table surface of the carbon fiber grinding dustproof and explosion-proof rotary table of the present invention.

[0036] Figure 5 This is a schematic diagram of the dust extraction pipe and sealing structure of the dustproof and explosion-proof rotary table for carbon fiber grinding according to the present invention.

[0037] Figure 6 This is a schematic diagram of the fixture for the carbon fiber grinding dustproof and explosion-proof rotary table of the present invention.

[0038] In the attached diagram: 1. Turntable base; 2. Reducer mounting plate; 3. External sealing shell; 4. Tabletop; 5. Dust extraction pipe; 5a. Movable pipe wall; 5b. Intermediate component; 5c. Fixed pipe wall; 6. Reducer; 6a. Output flange; 6b. Fixed part; 7. Servo motor; 8. Pressure detection switch; 9. Air outlet pipe; 10. Pressure regulating valve; 11. Pressure regulating valve isolation box; 12. Detachable sealing door; 13. Anchor bolt; 14. Cable seal; 15. Felt ring; 16. Clamp; 16a. Handwheel; 16b. Clamping claw; 16c. Track; 16d. Center hole. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention. Figure 1 This is a schematic diagram of the carbon fiber grinding dustproof and explosion-proof rotary table of the present invention;

[0040] Figure 2 This is a vertical cross-sectional view of the carbon fiber grinding dustproof and explosion-proof rotary table of the present invention; Figure 3This is a cross-sectional view of the carbon fiber grinding dustproof and explosion-proof rotary table of the present invention, viewed from below after being cut horizontally. Figure 4 This is a schematic diagram of the connection between the outer sealing shell and the table surface of the carbon fiber grinding dustproof and explosion-proof rotary table of the present invention. Figure 5 This is a schematic diagram of the dust collection pipe and sealing structure of the dustproof and explosion-proof rotary table for carbon fiber grinding of the present invention. Figure 6 This is a schematic diagram of the fixture for the dustproof and explosion-proof rotary table for carbon fiber grinding of the present invention. See also: Figures 1 to 6 As shown, a preferred embodiment of a carbon fiber grinding dustproof and explosion-proof rotary table includes: a rotary table base 1, a table surface 4, a dust extraction pipe 5, and a positive pressure maintaining system. The table surface 4 is mounted on the rotary table base 1, and the table surface 4 and the rotary table base 1 together form an accommodating space. The middle part of the dust extraction pipe 5 is located within the accommodating space. One end of the dust extraction pipe 5 connects from below the table surface 4 to the upper surface of the table surface 4 to form an opening. One end of the dust extraction pipe 5 is connected to the center of the table surface 4, and the other end of the dust extraction pipe 5 is connected to an external suction device. The positive pressure maintaining system includes: a cable seal 14, a pressure regulating valve 10, a pressure detection switch 8, and an air outlet pipe 9. The cable seal 14... 4. The cable seal 14 is connected to the external gas supply device and is mounted on the turntable base 1. The pressure regulating valve 10, pressure detection switch 8 and gas outlet pipe 9 are all located in the accommodating space. The pressure regulating valve 10 is connected to the cable seal 14 and the pressure detection switch 8. The pressure detection switch 8 is connected to one end of the gas outlet pipe 9, and the other end of the gas outlet is open and exposed in the accommodating space. The external gas enters the accommodating space from the cable seal 14 through the pressure regulating valve 10, the pressure detection switch 8 and the gas outlet pipe 9 in sequence. The pressure regulating valve 10 adjusts the pressure of the external gas passing through the pressure regulating valve 10, and the pressure detection switch 8 detects the difference between the internal pressure of the accommodating space and the atmospheric pressure.

[0041] In a preferred embodiment, the carbon fiber grinding dustproof and explosion-proof rotary table further includes: a servo motor 7 and a reducer 6. The servo motor 7 is connected to the reducer 6, and the reducer 6 is connected to the table surface 4. The servo motor 7 drives the table surface 4 to rotate through the reducer 6.

[0042] In a preferred embodiment, the carbon fiber grinding dustproof and explosion-proof rotary table further includes: a pressure regulating valve isolation box 11, wherein the pressure regulating valve 10 is disposed in the pressure regulating valve isolation box 11, and the pressure regulating valve isolation box 11 is mounted on the rotary table base 1.

[0043] In a preferred embodiment, the turntable base 1 includes a detachable sealing door and anchor bolts 13, the anchor bolts 13 being located at the bottom of the turntable base 1, and the pressure regulating valve isolation box 11 being mounted on the detachable sealing door.

[0044] In a preferred embodiment, the carbon fiber grinding dustproof and explosion-proof rotary table further includes: a speed reducer mounting plate 2, which is disposed between the rotary table base 1 and the table surface 4, the speed reducer mounting plate 2 is mounted on the rotary table base 1, and the speed reducer 6 is mounted on the speed reducer mounting plate 2.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention.

[0046] In addition to the above, the present invention also has the following embodiments:

[0047] In a further embodiment of the present invention, the carbon fiber grinding dustproof and explosion-proof rotary table further includes: an outer sealing shell 3, which is disposed between the reducer mounting plate 2 and the table surface 4. The outer sealing shell 3 and the reducer mounting plate 2 are detachably connected. The outer sealing shell 3 has an annular first groove and a second groove. The first groove and the second groove respectively enclose the lower surface of the table surface 4 to form a first sealing cavity and a second sealing cavity. The first sealing cavity is provided with a felt ring 15. The second sealing cavity is provided with sealing lubricating grease, which occupies half of the volume of the second sealing cavity.

[0048] In a further embodiment of the present invention, the reducer 6 includes a fixed part 6b and an output flange 6a. The fixed part 6b is fixedly installed on the reducer mounting plate 2, and the output flange 6a is connected to the platform 4.

[0049] In a further embodiment of the present invention, the vacuum pipe 5 includes: a movable pipe wall 5a, an intermediate component 5b, and a fixed pipe wall 5c. The intermediate component 5b connects the movable pipe wall 5a and the fixed pipe wall 5c. The movable pipe wall 5a is connected to the tabletop 4 and is coaxially arranged with the tabletop 4. The movable pipe wall 5a rotates with the tabletop 4. One end of the intermediate component 5b is a sleeve structure, which is sleeved outside the movable pipe wall 5a. The movable pipe wall 5a rotates freely inside the intermediate component 5b. The other end of the intermediate component 5b is fixedly connected to the fixed pipe wall 5c. The fixed pipe wall 5c is fixedly connected to the turntable base 1 and extends out of the accommodating space.

[0050] In a further embodiment of the present invention, the carbon fiber grinding dustproof and explosion-proof rotary table further includes: a clamp 16, which is installed on the upper surface of the table 4. A central hole 16d is formed on the gripping claw, which corresponds to the dust suction pipe 5. The clamp 16 includes: a handwheel 16a, a track 16c and a gripping claw 16b. The track 16c is arranged in a ring array with the central hole 16d as the center. One end of each track 16c points to the central hole 16d. A handwheel 16a is provided on the other end of each track 16c. A gripping claw 16b is provided on each track 16c. The handwheel 16a drives the gripping claw 16b to move along the track 16c.

[0051] A method of using a carbon fiber grinding dustproof and explosion-proof rotary table, wherein the method of using the aforementioned carbon fiber grinding dustproof and explosion-proof rotary table includes:

[0052] Step S1: Turn on the positive pressure holding system. External gas enters the accommodating space from the cable seal 14 through the pressure regulating valve 10, the pressure detection switch 8 and the gas outlet pipe 9 in sequence.

[0053] Step S2: After the external gas fills the container space, the pressure value is constant. At this time, the pressure regulating valve 10 is adjusted to control the external gas to not enter or to enter the container space at a constant flow rate, so that the value detected by the pressure detection switch 8 is within the preset range.

[0054] Step S3: Turn on the vacuum pipe 5 to form an adsorption of objects on the upper surface of the countertop 4;

[0055] Step S4: Open table 4 for processing;

[0056] Step S5: If the value detected by the pressure detection switch 8 exceeds the preset range, the table 4 will stop processing.

[0057] Specifically, in step S2, adjusting the pressure regulating valve 10 controls the external gas from entering or to enter the containment space at a constant flow rate because the sealing of the containment space is difficult to control. If the sealing is good, no more gas needs to be introduced, that is, the pressure can be stabilized within the preset pressure range without pressurization. If the sealing is poor, a certain amount of gas needs to be continuously introduced, that is, quantitative pressurization, so that the leaked gas and the added gas form a dynamic balance, so that the pressure inside the containment space is within the preset pressure range.

[0058] In a preferred embodiment, the device integrates a dust extraction pipe 5 on the countertop 4, which facilitates the handling of dust during operation.

[0059] In a preferred embodiment, a positive pressure holding system is used to continuously introduce gas into the containment space to form a gas barrier that isolates electrical components from dust, preventing explosion hazards and extending the service life of electrical components.

[0060] In a preferred embodiment, existing technologies typically only have a sealed design and lack a dust extraction function. Therefore, carbon fiber dust cannot be removed from the processing environment during grinding, and the accumulated dust interferes with the processing and pollutes the workshop environment. Currently, the common practice for dust removal is to add external dust extraction equipment. However, adding external dust extraction equipment is unsuitable in some situations, such as when grinding the inner circle of carbon fiber parts. The inner circle space is inconvenient for placing the grinding head and an external dust extraction port, and the dust generated during grinding is constrained by the part's shell, reaching extremely high concentrations in the inner circle space, posing a risk of explosion. This invention integrates a dust extraction pipe 5 in the center of the turntable, which can continuously discharge the dust accumulated during grinding, reducing the dust concentration in the processing environment, and is particularly suitable for grinding the inner circle of carbon fiber parts. Furthermore, while balancing dust extraction and rotation functions, this invention achieves a seal for the reducer 6 and motor through a special design, reducing the impact of dust on the operation of the reducer 6 and motor, representing an innovation in existing technology.

[0061] In a preferred embodiment, the grinding process generates a large amount of dust, which mixes with air to form aerosols. These aerosols have strong diffusion capabilities, and even in ordinary sealed environments, they can still permeate after a period of use, posing an explosion risk. In existing technologies, turntables can use explosion-proof motors and ordinary sealing solutions to achieve explosion-proof functionality; however, explosion-proof motors are expensive, have limited specifications, and poor compatibility. This invention designs a positive pressure system to prevent the penetration of dust aerosols, and is compatible with ordinary motors, thereby effectively reducing equipment costs and adaptation workload.

[0062] In a preferred embodiment, the turntable base 1 is a cuboid frame structure, with the edges of the frame welded from square hollow steel. The upper surface of the turntable base 1 is a rectangular steel plate with a circular hole, and the lower surface is a regular rectangular steel plate. The upper and lower steel plates are connected to the frame by welding, and the weld seams need to be tested for air leakage after welding. The four sides of the turntable base 1 have grooves and threaded holes for installing sealing rubber gaskets and removable sealing doors 12.

[0063] In a preferred embodiment, the circular hole on the bottom surface of the turntable can accommodate the reducer 6. Threaded holes are provided near the circular hole for mounting the reducer mounting plate 2. The reducer mounting plate 2 is a ring-shaped steel plate. The outer diameter of the ring is slightly larger than the diameter of the circular hole on the turntable base 1, and the inner diameter is slightly smaller than the diameter of the circular hole on the turntable. A series of through holes are provided near the outer circle for bolts to pass through and connect to the threaded holes on the upper surface of the turntable base 1; a series of threaded holes are provided near the inner circle for easy connection of the reducer 6 with bolts.

[0064] like Figure 1As shown, the reducer mounting plate 2 forms a beam-like structure on the circular hole on the upper surface of the turntable base 1, connecting the turntable base 1 and the reducer 6.

[0065] In a preferred embodiment, in addition to a set of threaded holes and a set of through holes on the lower surface of the turntable base 1, a set of threaded holes is provided on the upper surface of the reducer mounting plate 2 near the inner circle for connecting the outer sealing shell 3. The outer sealing shell 3 is an annular part, and its radial cross-section is shown below. Figure 4 The lower surface of the outer sealing shell 3 is bolted to the reducer mounting plate 2. The upper surface of the outer sealing shell 3 has a narrow annular first groove away from the center, used to accommodate the felt ring 15. Inside this groove is a wider second groove, into which approximately half the volume of sealing lubricating grease is injected. This second groove engages with the annular labyrinth protrusion at the bottom of the platform 4 to form a labyrinth seal. The labyrinth seal with the felt ring 15 isolates external dust during turntable rotation.

[0066] In a preferred embodiment, the platform 4 is a ring-shaped steel part with a set of through holes in the middle portion of the ring, which is bolted to the output flange 6a of the reducer 6, see [link to documentation]. Figure 4 Fixed connection; another set of through holes is reserved on the outer side of the ring for installing clamp 16; there is also a set of through holes on the inner side of the ring for connecting the movable pipe wall 5a of the vacuum pipe 5, see Figure 5 .

[0067] In a preferred embodiment, the reducer 6 is a hollow RV reducer 6, with a central circular hole for accommodating the suction pipe 5. The reducer 6 can be divided into a fixed portion 6b and an output flange 6a. The fixed portion 6b is mounted on the reducer mounting plate 2, and the housing of the servo motor 7 is fixed to the fixed portion 6b of the reducer 6 by bolts. Furthermore, the central circular hole of the reducer 6 is integrally formed from a metal part, with no gaps or holes on the inner wall of the hole.

[0068] In a preferred embodiment, the suction duct 5 is ultimately connected to a dust removal device to expel dust generated during the grinding of the part's internal cavity. To maintain a good seal of the reducer 6 while the table 4 rotates and the duct is suctioned, this structure employs a special design. For example... Figure 5 As shown, the dust extraction pipe 5 consists of a movable pipe wall 5a, an intermediate component 5b, and a fixed pipe wall 5c. When the turntable is working, the movable pipe wall 5a rotates together with the table surface 4, while the intermediate component 5b and the fixed pipe wall 5c remain stationary.

[0069] In a preferred embodiment, the intermediate component 5b is a steel cylindrical sleeve with a flange at one end. The flange is bolted to the fixed portion 6b of the reducer 6, and a sealing ring is used to reinforce the seal at the connection. The sleeve portion fits over the movable tube wall 5a, with a certain gap between them, ensuring that the rotation of the movable tube wall 5a is unaffected. The movable tube wall 5a, the intermediate component 5b, and the inner wall of the central hole 16d of the reducer 6 form a narrow, tortuous channel. Simultaneously, at the end of the channel, a small cavity is formed between the flange of the intermediate component 5b and the inner wall of the reducer 6. By injecting sealing lubricating grease into the cavity and adding a felt ring between the inner wall of the central hole of the reducer 6 and the outer wall of the intermediate component 5b, combined with the narrow, tortuous, labyrinthine gas circuit, a good sealing effect is achieved even when the turntable rotates. The fixed tube wall 5c is bolted to the flange of the intermediate component 5b, and a rubber gasket maintains a seal at the connection. The other end of the fixed tube wall 5c extends from the side of the turntable for connection to external dust removal equipment.

[0070] In a preferred embodiment, in addition to the aforementioned mechanical structure, to mitigate the risk of explosion due to seal failure and the infiltration of flammable gases or aerosols, the device also includes a positive pressure maintenance system. The positive pressure maintenance system comprises: a cable seal 14, a pressure regulating valve 10, a pressure regulating valve isolation box 11, a pressure detection switch 8, an outlet pipe 9, several TPU tubing and connectors. The gas for the positive pressure maintenance system originates from the outside; clean, high-pressure air enters the rotary table through the tubing from the cable seal 14 and passes through the pressure regulating valve 10. The pressure regulating valve 10 is independently installed inside the pressure regulating valve isolation box 11, as shown in [reference needed]. Figure 1 , Figure 2 The interior of the isolation box is airtight with respect to the turntable base 1. The other side of the isolation box has a detachable transparent panel, which allows operators to observe and adjust the pressure regulating valve 10.

[0071] In a preferred embodiment, the pressure regulating valve 10 is equipped with a pressure display gauge that shows the difference between the outlet air pressure and the standard atmospheric pressure. Furthermore, the pressure regulating valve 10 has an adjustment knob to set the pressure difference. After passing through the pressure regulating valve 10, the gas pressure decreases to the set value and returns to the turntable base 1 through the air pipe, then passes through the pressure detection switch 8. The pressure detection switch 8 monitors the difference between the gas pressure in the air pipe and the standard atmospheric pressure. When the pressure difference is less than a certain threshold, typically 0.2 bar, it indicates that the turntable's seal has failed or the gas circuit has malfunctioned. At this time, the monitoring switch generates an electrical signal, which is transmitted via cable to external control equipment to take appropriate safety measures, such as cutting off the motor's power supply to prevent fire or explosion. After passing through the pressure detection switch 8, the gas enters the outlet pipe 9 through a three-way connector, slowly and evenly releasing around the servo motor 7, continuously replenishing the small amount of air leaking from various connections, thus maintaining the air pressure inside the turntable base 1 at the value set by the pressure regulating valve 10.

[0072] In a preferred embodiment, the clamp 16 is mounted on the table 4, see Figure 6 Its structure is similar to a centering chuck with a central hole. The gripping jaws 16b directly contact the workpiece and can move radially on the track 16c, their position adjusted by the handwheel 16a. The central hole 16d connects to the dust extraction pipe 5, serving a dust removal function.

[0073] In a preferred embodiment, the device features a central dust extraction pipe 5, which continuously removes dust during workpiece grinding, making it particularly suitable for grinding the inner diameter of carbon fiber parts. The connections of the moving parts of the device employ a double seal of labyrinth and felt rings to ensure reliable and durable sealing, effectively extending the service life of the reducer 6.

[0074] In a preferred embodiment, the device is equipped with a positive pressure maintaining system, which has the functions of automatically monitoring the pressure difference and manually adjusting the pressure difference. It can be used normally in hazardous gas environments, including aerosols of combustible particles and combustible gases, without the need for expensive explosion-proof motors.

[0075] In a preferred embodiment, the key parts of the present invention are all designed to be detachable, have maintenance doors, and have reserved mounting holes for clamps 16, making them convenient to use and easy to maintain.

[0076] In a preferred embodiment, the present invention is particularly applicable to the field of carbon fiber polishing, but it can also be used directly or with minor modifications in other fields.

[0077] In a preferred embodiment, the grinding work is carried out in a closed grinding chamber, the workpiece being ground is a large carbon fiber structural component, and the grinding tool is an explosion-proof industrial robot with a grinding head at the end.

[0078] In a preferred embodiment, the specific method of using this device is as follows:

[0079] Step A1: First, place the turntable in a suitable position, and use anchor bolts 13 to level and fix the table surface 4. Connect the protruding part of the dust extraction pipe 5 to the dust extraction equipment outside the grinding room, and connect the electrical cables of the positive pressure system and servo motor 7 to the cable seal 14. Install the fixture 16 using the reserved holes on the table surface 4 and clamp the workpiece on the fixture 16.

[0080] Step A2: Remove the transparent panel of the pressure regulating valve isolation box 11, rotate the adjusting knob of the pressure regulating valve 10 to 0.3 bar, and then reinstall the transparent panel onto the isolation box. Turn on the air source of the positive pressure system, and the gas enters the turntable base 1 through the cable seal 14. Due to the sealed design of the turntable base 1, the internal air pressure gradually rises until it is the same as the outlet pressure of the pressure regulating valve 10. During the positive pressure inflation process, when the difference between the internal air pressure of the turntable and the standard atmospheric pressure is greater than 0.2 bar, the pressure detection switch 8 will close the corresponding contact on the external controller, allowing the servo motor 7 to be powered on normally. At this time, the air pressure inside the box is greater than the ambient air pressure, and the gas leaking from the sealed gaps always flows from the inside of the turntable to the grinding chamber. Therefore, flammable gases and aerosols in the grinding chamber will not enter the inside of the turntable. Under normal operation and with the internal positive pressure maintained, the external air source only replenishes the gas leaking from the sealed gaps, so the gas flow rate is very small.

[0081] Step A3: After a period of time, when the pressure gauge reading on the pressure regulating valve 10 stabilizes, the positive pressure inflation is complete. At this point, the operator exits the grinding chamber and turns on the external dust collection device. The processing program is then started on the controller. During the grinding process, the servo motor 7 of the rotary table moves under the control of the controller, driving the workpiece to rotate via the reducer 6, facilitating the robot's grinding of various surfaces of the workpiece. A large amount of carbon fiber dust generated during grinding is partially sucked away by the dust collection pipe 5 in the center of the rotary table, while the rest accumulates on various surfaces or disperses in the air. However, both moving connection points of the rotary table utilize a double sealing measure of labyrinth seals and felt ring seals, preventing dust from entering and ensuring the normal operation of the reducer 6.

[0082] Step A4: During the processing, if the turntable loses pressure due to shell damage or severe seal failure, the pressure detection switch 8 will automatically cut off the contact. At this time, the controller will issue an alarm and shut off the power to the servo motor 7 to prevent flammable and explosive gases from seeping in and causing a deflagration.

[0083] Step A5: After processing is complete, continue to operate the positive pressure air source and external dust collection device. After a period of time, turn off the external dust collection device. At this time, the operator can wear protective equipment, perform electrostatic discharge, and enter the grinding room to remove the workpiece and clean the remaining dust.

[0084] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A dustproof and explosion-proof rotary table for carbon fiber grinding, characterized in that, include: Turntable base; A tabletop, which is mounted on the turntable base, and the tabletop and the turntable base together form an accommodating space; A vacuum suction pipe is provided in the middle of the accommodating space. One end of the vacuum suction pipe is connected from the bottom of the countertop to the upper surface of the countertop to form an opening. One end of the vacuum suction pipe is connected to the center of the countertop. The other end of the vacuum suction pipe is connected to an external suction device. A positive pressure maintaining system includes: a cable seal, a pressure regulating valve, a pressure detection switch, and a gas outlet pipe. The cable seal is mounted on the turntable base and connected to an external gas supply device. The pressure regulating valve, the pressure detection switch, and the gas outlet pipe are all located within an accommodating space. The pressure regulating valve is connected to the cable seal and the pressure detection switch. The pressure detection switch is connected to one end of the gas outlet pipe, and the other end of the gas outlet pipe is openly exposed within the accommodating space. External gas enters the accommodating space sequentially from the cable seal through the pressure regulating valve, the pressure detection switch, and the gas outlet pipe. The pressure regulating valve adjusts the pressure of the external gas passing through it, and the pressure detection switch detects the difference between the internal pressure of the accommodating space and the atmospheric pressure.

2. The carbon fiber grinding dustproof and explosion-proof rotary table according to claim 1, characterized in that, Also includes: A servo motor and a reducer are provided, wherein the servo motor is connected to the reducer, the reducer is connected to the platform, and the servo motor drives the platform to rotate through the reducer.

3. The carbon fiber grinding dustproof and explosion-proof rotary table according to claim 1, characterized in that, Also includes: A pressure regulating valve isolation box is provided, wherein the pressure regulating valve is disposed in the pressure regulating valve isolation box, and the pressure regulating valve isolation box is mounted on the turntable base.

4. The carbon fiber grinding dustproof and explosion-proof rotary table according to claim 3, characterized in that, The turntable base includes a detachable sealing door and anchor bolts. The anchor bolts are located at the bottom of the turntable base, and the pressure regulating valve isolation box is installed on the detachable sealing door.

5. The carbon fiber grinding dustproof and explosion-proof rotary table according to claim 1, characterized in that, Also includes: A speed reducer mounting plate is disposed between the turntable base and the platform. The speed reducer mounting plate is installed on the turntable base, and the speed reducer is installed on the speed reducer mounting plate.

6. The carbon fiber grinding dustproof and explosion-proof rotary table according to claim 5, characterized in that, Also includes: An external sealing shell is disposed between the reducer mounting plate and the platform. The external sealing shell and the reducer mounting plate are detachably connected. The external sealing shell has an annular first groove and a second groove. The first groove and the second groove respectively enclose the lower surface of the platform to form a first sealing cavity and a second sealing cavity. The first sealing cavity is provided with a felt ring, and the second sealing cavity is provided with sealing lubricating grease.

7. The carbon fiber grinding dustproof and explosion-proof rotary table according to claim 6, characterized in that, The speed reducer includes a fixed part and an output flange. The fixed part is fixedly installed on the speed reducer mounting plate, and the output flange is connected to the platform.

8. The carbon fiber grinding dustproof and explosion-proof rotary table according to claim 7, characterized in that, The vacuum pipe includes: a movable pipe wall, an intermediate component, and a fixed pipe wall. The intermediate component connects the movable pipe wall and the fixed pipe wall. The movable pipe wall is connected to the tabletop and is coaxially arranged with the tabletop. The movable pipe wall rotates with the tabletop. One end of the intermediate component is a sleeve structure, which is sleeved outside the movable pipe wall. The movable pipe wall rotates freely inside the intermediate component. The other end of the intermediate component is fixedly connected to the fixed pipe wall. The fixed pipe wall is fixedly connected to the turntable base and extends out of the accommodating space.

9. The carbon fiber grinding dustproof and explosion-proof rotary table according to claim 1, characterized in that, Also includes: A clamp is mounted on the upper surface of the table. The clamp has a central hole that corresponds to the suction pipe. The clamp includes a handwheel, rails, and clamping claws. The rails are arranged in a ring array around the central hole. One end of each rail points to the central hole. A handwheel is provided at the other end of each rail. A clamping claw is provided on each rail. The handwheel drives the clamping claws to move along the rails.

10. A method of using a dustproof and explosion-proof rotary table for carbon fiber grinding, characterized in that, The method of using the carbon fiber grinding dustproof and explosion-proof rotary table according to any one of claims 1 to 9 includes: Step S1: Activate the positive pressure maintaining system. External gas enters the accommodating space from the cable seal in sequence through the pressure regulating valve, the pressure detection switch, and the gas outlet pipe. Step S2: After the external gas fills the accommodating space, the pressure value is constant. At this time, the pressure regulating valve is adjusted to control the external gas to not enter or to enter the accommodating space at a constant flow rate, so that the value detected by the pressure detection switch is within the preset range. Step S3: Open the vacuum pipe to form an adsorption of objects on the surface of the countertop; Step S4: Open the worktable for processing; Step S5: If the value detected by the pressure detection switch exceeds the preset range, the table will stop processing.

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