Combustion chamber metal tile fixing screw casting riser grinding workbench

Abstract

The invention discloses a combustion chamber metal tile fixing screw casting riser grinding workbench and relates to the technical field of grinding equipment. Comprising a dustproof box and a belt sander assembled in the dustproof box. A reciprocating driving system for providing displacement driving force is assembled at the upper part in the dustproof box, the reciprocating driving system is also provided with a lifting mechanism, the lifting mechanism is provided with a clamping device for clamping a metal tile fixing screw, and a residual riser of a threaded rod part of the metal tile fixing screw is exposed from the lower part; a grinding station is arranged in the middle of an abrasive belt of the belt sander and located in the moving range below the assembling and clamping device. Accurate grinding of the belt sander becomes possible, and high-precision grinding of dead head residues independent of skilled workers is guaranteed through various structural designs.

Description

Technical Field

[0001] This application relates to the technical field of grinding equipment, and in particular to a grinding table for casting risers of combustion chamber metal tile fixing screws. Background Technology

[0002] The metal tile fixing screws of the combustion chamber metal tiles (usually referring to heat insulation tiles or flame tube tiles) of an aircraft engine are the key "lifeline" connecting high-temperature components to the load-bearing structure. They must not only withstand extreme thermal loads and mechanical vibrations, but also ensure the sealing of the combustion chamber. The precision of their manufacturing process directly determines the reliability and lifespan of the engine.

[0003] Significance for aircraft engines: (1) Structural connection and positioning: Metal tile fixing screws fix the metal tile (heat insulation tile) to the combustion chamber shell or flame tube to ensure that it does not shift or fall off under high-speed airflow and vibration.

[0004] (2) "Buffer" for thermal expansion and contraction: The working temperature of the combustion chamber is extremely high (up to 2000℃ or more), and the coefficient of thermal expansion of the metal tile and the base material are different. The design of the metal tile fixing screw connection must allow for a certain thermal displacement to prevent the tile from cracking or the metal tile fixing screw from breaking due to thermal stress.

[0005] (3) Vibration damping: The engine vibrates violently when it is running. The preload of the metal bearing fixing screw is the key to suppressing resonance and preventing fatigue fracture.

[0006] The core requirements for process precision: Due to the extremely harsh working environment, the manufacturing and installation precision of these metal tile fixing screws far exceeds ordinary mechanical standards, mainly in the following aspects: (1) Materials and heat treatment High temperature resistance: High-temperature alloys (such as Inconel 718, Inconel 939, etc.) must be used to maintain high strength at temperatures above 600°C.

[0007] Creep resistance: The material must not creep or relax under long-term high temperature, otherwise the preload will fail.

[0008] (2) Dimensions and geometric tolerances The overall structural precision reaches the micrometer level.

[0009] For example, the thread accuracy is usually required to reach 6H / 6g or higher to ensure that the threaded pair fits tightly without any gaps or wobble. Coaxiality and perpendicularity: The perpendicularity of the metal tile fixing screw head to the screw rod and the coaxiality of the thread to the smooth rod require extremely high precision (usually at the 0.01mm level). Excessive deviation will lead to uneven stress during installation, generating additional bending moment, and making it very easy to break under vibration.

[0010] Surface roughness: The threaded surface and the shank require a high degree of smoothness (Ra<0.8μm) to reduce stress concentration points and improve fatigue life.

[0011] Summarize Although small, the metal bearing fixing screws in the combustion chamber are typical examples of "small parts, big responsibility." Their manufacturing precision is reflected not only in millimeter-level dimensional control, but also in micrometer-level surface quality and Newton-meter-level torque control. Any minute flaw can be magnified infinitely under the engine's extreme operating conditions, leading to catastrophic consequences.

[0012] The metal tile fixing screws are cast, and a second finishing process is required after casting.

[0013] During the secondary finishing process, most of the structures undergo minor surface treatments such as polishing and electroplating.

[0014] However, there is another step, the secondary finishing process, which is the grinding process of the cast riser of the metal tile fixing screw.

[0015] The metal tile fixing screws are produced using a casting process, and casting risers are unavoidable and cannot be too short.

[0016] To prevent deformation of the metal tile fixing screws (even slight deformation exceeding the allowance), the root of the cast riser cannot be forcibly cut off; it can only be slowly and meticulously ground by a professional craftsman.

[0017] Large-scale repairs, high difficulty in repair, long repair time, and reliance on the feel of professional craftsmen are issues that affect production cost reduction, production efficiency improvement, and product yield improvement. Summary of the Invention

[0018] To address the shortcomings of existing technologies, the purpose of this invention is to provide a grinding table for casting risers of combustion chamber metal tile fixing screws.

[0019] The grinding table for casting risers of combustion chamber metal tile fixing screws provided in this application adopts the following technical solution: A grinding table for casting risers and fixing screws for combustion chamber metal tiles, including a dustproof box and a belt sander assembled inside the dustproof box; The upper part of the dustproof box is equipped with a reciprocating drive system that provides displacement driving force. The reciprocating drive system is also equipped with a lifting mechanism. The lifting mechanism is equipped with a clamping device for clamping the metal tile fixing screw. The metal tile fixing screw has a threaded rod end face with a riser remaining exposed from below. The belt sander has a grinding station in the middle of the sanding belt, which is located in the range of motion below the assembly clamping device; A copper pad is fixed below the grinding station. The copper pad supports the abrasive belt and has a wear-resistant coating (such as Babbitt metal or polytetrafluoroethylene layer) on top. The abrasive belt moves backward from the front end of the copper pad; Above the front end of the copper pad is an oil reservoir for storing lubricating oil, and in the oil reservoir are driven rolling oil rollers arranged along the width direction. The top of the oil roller rests against the lower surface of the sanding belt; There are closed-loop raised ribs on both sides of the sand belt; Both the driving roller and the driven roller have annular grooves on both sides, and closed-loop protrusions are embedded in the annular grooves. The width of the upper surface of the copper pad is less than the width between the two closed-loop raised ribs; It is also equipped with a vacuuming device; The dust collection device has a negative pressure fan, an air outlet, an air intake, and a filter dust collection bin; Both the air outlet and the air intake are located inside the dustproof box; The air outlet is located at the front of the sanding belt of the belt sander and is higher than the grinding station height, with the air outlet direction facing the grinding station; The air intake is located at the rear of the belt sander and below the grinding station height. The air intake direction is inclined upwards and towards the rear of the belt sander.

[0020] In use: Assemble the threaded rod end face with riser residue into the clamping device while keeping it horizontal and facing downward; The height of the metal tile fixing screws is adjusted by the lifting mechanism in the reciprocating drive system to control the residual contact of the riser with the grinding station, and the copper pad provides support and buffer. Activate the dust collection device to cause the airflow to flow from the upper front of the grinding station to the lower rear of the grinding station, adhering to the upper surface of the sanding belt. Start the belt sander, and then drive the clamping device to move back and forth through the reciprocating drive system, so that the riser remains on the sand belt to produce synchronous grinding in both the front and back and left and right dimensions. Gradually lower the clamping device and gradually grind away any remaining riser residue.

[0021] Current technology relies entirely on operators manually grinding metal tile fixing screws on a grinding wheel. These screws are small and streamlined, making them difficult to handle precisely. Manual grinding inevitably leads to low processing accuracy, inconsistent quality, low efficiency, and excessive reliance on personal experience.

[0022] In traditional belt sanders, the abrasive belt between the two rollers is usually suspended in the air, lacking stable support. If used directly for grinding, the abrasive belt will deform and vibrate under the pressure of the threaded end face of the metal bearing fixing screw, making it impossible to form a precise and reliable machining reference plane.

[0023] The above-mentioned technical solution of this patent makes it possible for belt sanders to perform precise grinding, and through many structural designs, it ensures high-precision grinding without relying on skilled workers for riser residue.

[0024] This patent application employs a flat copper pad for stable support and incorporates a specially designed driven lubrication system to eliminate wear on the abrasive belt's bottom surface and the wear-resistant coating on the copper pad during rotation. This ensures grinding accuracy for a longer period, thereby guaranteeing the production quality of mass-produced metal tile fixing screws.

[0025] By utilizing the moderate hardness of copper in the copper pad, both a cushioning effect and sufficient supporting strength are ensured. This provides conditions for grinding accuracy while also effectively buffering the excessive pressure exerted on the abrasive belt by riser residue.

[0026] A dust extraction device is installed to cause airflow to flow from the upper front of the grinding station to the lower rear of the grinding station, adhering to the upper surface of the sanding belt.

[0027] By conforming to the grinding direction of the abrasive belt and utilizing the inertia of the grinding dust, the dust collection (dust removal effect) is improved.

[0028] Simultaneously, the design of directing the airflow towards the grinding station cools the metal tile fixing screws during the grinding process. This further improves machining accuracy and prevents workpiece damage. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the open door panel of the grinding table for the metal tile fixing screws of the combustion chamber; Figure 2 This is a schematic diagram of the structure of the copper pad block assembled with the oil roller; Figure 3 This is a schematic diagram of the structure in which the closed-loop raised rib below the sanding belt cooperates with the annular grooves on the driving and driven rollers that match the closed-loop raised rib. Figure 4 This is a schematic diagram of the internal structure of the dustproof box, including the combustion chamber metal tile fixing screws, casting risers, and grinding table. Figure 5 This is a schematic diagram of the riser residue of the metal tile fixing screw.

[0030] Reference numerals: 1. Clamping device; 2. Metal tile fixing screw; 3. Belt sander; 4. Sanding belt; 5. Dustproof box; 6. Slide table; 7. Lifting mechanism; 8. Copper pad; 9. Oil storage tank; 10. Oil roller; 11. Closed-loop raised rib; 12. Annular groove; 13. Riser residue; 14. Negative pressure fan. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail.

[0032] See attached document Figure 1 -Appendix Figure 5 The grinding table for casting risers of combustion chamber metal tile fixing screws includes a dustproof box 5 and a belt sander 3 assembled inside the dustproof box 5; the upper part of the dustproof box 5 is equipped with a reciprocating drive system that provides displacement driving force, and the reciprocating drive system is also equipped with a lifting mechanism 7. The lifting mechanism 7 is equipped with a clamping device 1 for clamping the metal tile fixing screws 2. The threaded end face of the metal tile fixing screw 2 with riser residue 13 is exposed from below; a grinding station is set in the middle of the sanding belt 4 of the belt sander 3, and the grinding station is located in the range of motion below the clamping device 1; a copper pad 8 is fixed below the grinding station. The sanding belt 4 is supported flat below, and a wear-resistant coating (such as Babbitt metal or polytetrafluoroethylene layer) is provided on the copper pad 8. The sanding belt 4 moves backward from the front end of the copper pad 8. There is an oil reservoir 9 for storing lubricating oil above the front end of the copper pad 8. The oil reservoir 9 contains driven rolling oil rollers 10 arranged along the width direction. The top of the oil rollers 10 abuts against the lower surface of the sanding belt 4. There are closed-loop raised ribs 11 on both sides of the lower part of the sanding belt 4. There are annular grooves 12 on both sides of the driving roller and the driven roller. The closed-loop raised ribs 11 are embedded in the annular grooves 12. The width of the upper surface of the copper pad 8 is less than the width between the two closed-loop raised ribs 11. It is also equipped with a dust collection device; the dust collection device has a negative pressure fan 14, an air outlet, an air inlet, and a filter dust collection bin; the air outlet and the air inlet are both located inside the dustproof box 5; the air outlet is located at the front of the sanding belt 4 of the belt sander 3 and is higher than the grinding station height, and the air outlet direction is towards the grinding station; the air inlet is located at the rear of the sanding belt 4 of the belt sander 3 and is lower than the grinding station height, and the air inlet direction is inclined upwards and towards the rear of the sanding belt 4.

[0033] Dustproof box 5 is a box with an openable door. It can be placed on a desktop or workbench. When the door of dustproof box 5 is closed, it provides dust protection. Figure 1 This is a schematic diagram of the open door panel of the grinding table for the metal tile fixing screws of the combustion chamber.

[0034] In use: The threaded rod end face with riser residue 13 is kept horizontal and downward and assembled into the clamping device 1; The height of the metal tile fixing screw 2 is adjusted by the lifting mechanism 7 in the reciprocating drive system, and the riser residue 13 is controlled to contact the grinding station. The copper pad 8 provides support and generates buffer. Activate the dust collection device to cause the airflow to flow from the front and above of the grinding station to the rear and below the grinding station, adhering to the upper surface of the sanding belt 4. Start the belt sander 3, and then drive the clamping device 1 to move back and forth through the reciprocating drive system, so that the riser residue 13 will produce synchronous grinding in two dimensions, front and back and left and right, on the sanding belt 4. Gradually lower the clamping device 1 and gradually grind away the riser residue 13.

[0035] Current technology relies entirely on operators manually grinding metal tile fixing screws on a grinding wheel. The metal tile fixing screws are small and streamlined, making them difficult to handle precisely. Manual grinding inevitably leads to low processing accuracy, poor quality consistency, low efficiency, and excessive reliance on personal experience.

[0036] In traditional belt sanders, the abrasive belt between the two rollers is usually suspended in the air, lacking stable support. If used directly for grinding, the abrasive belt will deform and vibrate under the pressure of the threaded end face of the metal bearing fixing screw, making it impossible to form a precise and reliable machining reference plane.

[0037] The above-mentioned technical solution of this patent makes it possible for belt sanders to perform precise grinding, and through many structural designs, it ensures high-precision grinding without relying on skilled workers for riser residue 13.

[0038] This patent application employs a flat copper pad 8 for stable support and features a specially designed driven lubrication system to eliminate wear on the bottom surface of the abrasive belt 4 and the wear-resistant coating on the upper part of the copper pad 8 during rotation. This ensures grinding accuracy for a longer period, thereby guaranteeing the production quality of batches of metal tile fixing screws 2.

[0039] The copper pad 8 utilizes the moderate hardness of the copper material to ensure both a buffering effect and sufficient supporting strength. This provides conditions for grinding accuracy while also effectively buffering the excessive pressure exerted by the riser residue 13 on the abrasive belt 4.

[0040] A dust extraction device is installed to cause airflow to flow from the upper front of the grinding station to the lower rear of the grinding station, adhering to the upper surface of the sanding belt 4.

[0041] It follows the grinding direction of the abrasive belt 4 and utilizes the inertia of the grinding dust to improve dust collection (dust removal effect).

[0042] Simultaneously, the design of directing the airflow towards the grinding station cools the metal tile fixing screws 2 during the grinding process. This further improves machining accuracy and prevents workpiece damage.

[0043] refer to Figure 4 The upper part of the dustproof box 5 is equipped with a reciprocating horizontal drive mechanism. The reciprocating horizontal drive mechanism has a slide table 6. The movement trajectory of the slide table 6 is reciprocating along the width direction of the sanding belt 4. The slide table 6 is mounted on the lifting mechanism 7. The clamping device 1 is mounted below the slide table 6, so that the clamping device 1 is located above the grinding station.

[0044] The reciprocating horizontal drive mechanism and the lifting mechanism 7 together constitute a reciprocating drive system for driving the clamping device 1 to move.

[0045] The movement trajectory of the slide table 6 is reciprocating along the width direction of the sand belt 4, which is also reciprocating along the width direction of the dust box 5; The clamping device 1 is equipped with a clamping mechanism for clamping the metal tile fixing screw 2. After clamping is completed, the threaded end face of the metal tile fixing screw 2 is exposed from below the clamping device 1. The belt sander 3 passes under the dustproof box 5 in the conveying direction of the sanding belt 4, thus completing the mating structure where the grinding station is located below the moving range of the assembly clamping device 1. This reciprocating horizontal drive mechanism and the lifting mechanism 7 together constitute the reciprocating drive system that drives the clamping device 1 to move.

[0046] The motor of the belt sander 3 drives the active roller, which in turn drives the sanding belt 4 to run. At the same time, the clamping device 1 drives the metal tile fixing screw to move back and forth, thereby removing the riser residue 13 on the end face of the threaded rod of the metal tile fixing screw 2 and trimming the end face of the threaded rod of the metal tile fixing screw 2.

[0047] The clamping device 1 is mounted in the dustproof box 5 via a reciprocating drive system (a lifting mechanism 7 is mounted on the slide table 6), and the clamping device 1 and the clamped metal tile fixing screw 2 are positioned above the grinding station, with the threaded end face of the metal tile fixing screw 2 facing down. The reciprocating drive system (the lifting mechanism 7 is mounted on the slide table 6) drives the clamping device 1 to have the freedom of movement in the left and right (width direction) and up and down.

[0048] The clamping mechanism has a vertical threaded hole that matches the metal tile fixing screw 2; An openable locking cover is provided above the threaded hole; Open the locking cover and screw the metal tile fixing screw 2 into the threaded hole through its own external thread, leaving the riser residue 13 exposed below the threaded hole; Secure the locking cover plate, pressing down the upper part of the metal tile fixing screw 2 to restrict rotation.

[0049] A fixed mechanism and fixed operation that is simple to operate, has precise angles, is firmly fixed, and has high reliability during the grinding process.

[0050] Reference Figure 2 , Figure 3 and Figure 5 A copper pad 8 with a horizontal and flat upper surface is provided below the grinding station of the sanding belt 4. The copper pad 8 provides a horizontal reference for the sanding belt 4 to grind and finish the threaded end face of the metal tile fixing screw 2. The copper pad 8 is detachably fixed to the equipment bracket of the sander 3 by bolts. The upper surface of the copper pad 8 is precision ground to ensure that the upper surface of the copper pad 8 is horizontal. At the same time, in order to ensure a sufficient and stable support area, the length of the upper surface of the copper pad 8 in the width direction of the sanding belt 4 is not less than the reciprocating movement range of the threaded end face of the metal tile fixing screw 2 in the width direction of the sanding belt 4; the length of the upper surface of the copper pad 8 in the running direction of the sanding belt 4 is not less than the length of the threaded end face of the metal tile fixing screw 2 in the running direction of the sanding belt 4. Further, according to the traveling direction of the sanding belt 4, the sanding belt 4 moves backward from the front end of the copper pad 8. An oil reservoir 9 is provided above the front end of the copper pad 8, and the oil reservoir 9 is filled with lubricating oil. Meanwhile, an oil roller 10 is provided in the oil storage tank 9. The oil roller 10 includes a rotating shaft arranged along the width direction of the sanding belt 4 and a roller with a fiber structure. The lower part of the oil roller 10 is located in the oil storage tank 9 and is immersed in lubricating oil, while the upper part of the oil roller 10 abuts against the lower surface of the sanding belt 4. When the sanding belt 4 moves from the front end to the rear end of the copper pad 8 in a predetermined direction, it will drive the oil roller 10 to rotate, thereby continuously and evenly coating the lubricating oil onto the lower surface of the sanding belt 4, effectively lubricating the friction interface between the lower surface of the sanding belt 4 and the copper pad 8.

[0051] Reference Figure 3To further ensure stable transmission between the driving and driven rollers when the abrasive belt 4 is tensioned, the length of the upper surface of the copper pad 8 in the width direction of the abrasive belt 4 is less than the width of the abrasive belt 4; that is, the width of the upper surface of the copper pad 8 is less than the width of the abrasive belt 4. Furthermore, the lower surface of the abrasive belt 4 is provided with two closed-loop raised ribs 11. When the lower surface of the abrasive belt 4 contacts the copper pad 8, the copper pad 8 and the oil roller 10 are located between the two closed-loop raised ribs 11 on the lower surface of the abrasive belt 4. Correspondingly, annular grooves 12 matching the closed-loop raised ribs 11 are provided on the driving and driven rollers. When the abrasive belt 4 is assembled between the driving and driven rollers and is tensioned, the two closed-loop raised ribs 11 on the lower surface of the abrasive belt 4 are embedded in the annular grooves 12 on the driving and driven rollers. Two closed-loop raised ribs 11 on the lower surface of the abrasive belt 4 divide the lower surface of the abrasive belt 4 into three areas. The area between the two closed-loop raised ribs 11 is used to contact the copper pad 8 and for lubrication. At the same time, the area outside the two closed-loop raised ribs 11 is isolated to prevent the abrasive belt 4 from slipping on the drive roller and driven roller after the lower surface of the abrasive belt 4 is completely coated with lubricating oil. Furthermore, the lower surface of the abrasive belt 4 between the two closed-loop raised ribs 11 is coated with polytetrafluoroethylene (PTFE). The roller surfaces of the two rollers of the belt sander 3 are coated with rubber, and the lower surface of the abrasive belt 4 outside the two closed-loop raised ribs 11 is also coated with rubber. This ensures that the area responsible for grinding and contacting the copper pad 8, i.e., between the two closed-loop raised ribs 11, is coated with a PTFE coating with an extremely low coefficient of friction to minimize sliding resistance. Meanwhile, the area outside the two closed-loop raised ribs 11 responsible for power transmission and the roller surface are coated with a rubber coating with a high coefficient of friction to maximize transmission adhesion and torque transmission capability.

[0052] In summary, this application includes at least one of the following beneficial technical effects: The combustion chamber metal tile fixing screw casting riser grinding worktable provided in this application addresses the problems of low machining accuracy, poor quality consistency, low efficiency, and excessive reliance on personal experience caused by the prior art's complete reliance on operators manually grinding the metal tile fixing screws on a grinding wheel. It provides a grinding machine tool based on a belt abrasive machine. Existing technologies cannot directly use the more efficient belt abrasive machine to dress the threaded end face of the metal tile fixing screw.

[0053] In this patent application, a flat copper pad 8 is used to provide stable support for the abrasive belt 4, ensuring grinding accuracy.

[0054] 2. This application employs belt grinding under rigid support and integrates an oil suction roller to continuously apply lubricating oil from the oil reservoir to the lower surface of the belt and the upper surface of the pad, achieving automatic lubrication and reducing the problem of reference plane failure caused by wear. Furthermore, the two-dimensional motion system composed of a dustproof box, a horizontal sliding system, and a lifting mechanism enables the feeding motion of the threaded rod end face of the metal tile fixing screw relative to the belt, completely replacing unstable manual operation and thus jointly solving the inherent drawbacks of manual grinding. 3. The stable processing conditions ensured by the "pad support" and "mechanical feed" in this application significantly reduce reliance on operator experience and substantially improve the consistency of processing quality. Furthermore, the automatic lubrication further optimizes the grinding process, contributing to a smoother metal roof bolt end face. In summary, the combustion chamber metal roof bolt casting riser grinding table provided by this application greatly improves the grinding efficiency of the tenon threaded rod end face of a single metal roof bolt, thereby directly reducing the unit labor cost. It also ensures the consistency and stability of the metal roof bolt threaded rod end face grinding between different batches, significantly reducing the scrap rate and rework rate caused by dimensional deviations and surface defects, thus saving on the material cost and subsequent processing cost of the directional metal roof bolt. In addition, the high-precision threaded rod end face directly ensures ideal assembly tolerances, reducing abnormal vibrations during operation caused by poor matching, thereby avoiding adverse effects on engine efficiency and service life.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A grinding table for casting risers and fixing screws for combustion chamber metal tiles, characterized in that, Includes a dustproof box (5) and a belt sander (3) installed inside the dustproof box (5); The upper part of the dustproof box (5) is equipped with a reciprocating drive system that provides displacement driving force. The reciprocating drive system is also equipped with a lifting mechanism (7). The lifting mechanism (7) is equipped with a clamping device (1) for clamping the metal tile fixing screw (2). The threaded end face of the metal tile fixing screw (2) with riser residue (13) is exposed from below. The belt sander (3) has a grinding station in the middle of the sanding belt (4), which is located in the range of motion below the assembly clamping device (1); A copper pad (8) is fixed below the grinding station. The copper pad (8) supports the abrasive belt (4) below and has a wear-resistant coating on top of the copper pad (8). The sand belt (4) moves backward from the front end of the copper pad (8); Above the front end of the copper pad (8) is an oil reservoir (9) for storing lubricating oil, and in the oil reservoir (9) are driven rolling oil rollers (10) arranged along the width direction. The top of the oil roller (10) abuts against the lower surface of the sand belt (4); There are closed-loop raised ribs (11) on both sides of the sand belt (4); Both the driving roller and the driven roller have annular grooves (12) on both sides, and closed-loop protrusions (11) are embedded in the annular grooves (12). The width of the upper surface of the copper pad (8) is less than the width between the two closed-loop protruding ribs (11); It is also equipped with a vacuuming device; The dust collection device has a negative pressure fan (14), an air outlet, an air inlet, and a filter dust collection chamber; Both the air outlet and the air intake are located inside the dustproof box (5); The air outlet is located at the front of the sanding belt (4) of the belt sander (3) and is higher than the grinding station height, with the air outlet direction facing the grinding station; The air intake is located at the rear of the sanding belt (4) of the belt sander (3) and is lower than the height of the grinding station; The suction direction is inclined upwards, towards the rear of the sand belt (4).

2. The grinding table for casting risers of combustion chamber metal tile fixing screws according to claim 1, characterized in that: In use: The threaded rod end face with riser residue (13) is kept horizontal and assembled into the clamping device (1); The height of the metal tile fixing screw (2) is adjusted by the lifting mechanism (7) in the reciprocating drive system, and the riser residue (13) is controlled to contact the grinding station. The copper pad (8) provides support and generates buffer. Start the dust collection device to cause the airflow to flow from the front and above of the grinding station to the rear and below the grinding station, and to flow along the upper surface of the sanding belt (4). Start the belt sander (3), and then drive the clamping device (1) to move back and forth through the reciprocating drive system, so that the riser residue (13) will be synchronously ground on the sander belt (4) in two dimensions: front and back and left and right. Gradually lower the clamping device (1) and gradually grind away the riser residue (13).

3. The grinding table for casting risers of combustion chamber metal tile fixing screws according to claim 1, characterized in that: The upper part of the dust box (5) is equipped with a reciprocating horizontal drive mechanism. The reciprocating horizontal drive mechanism has a slide (6). The movement trajectory of the slide (6) is reciprocating along the width direction of the sand belt (4). The slide (6) is mounted on the lifting mechanism (7). A clamping device (1) is mounted below the slide (6) so that the clamping device (1) is located above the grinding station. The reciprocating horizontal drive mechanism and the lifting mechanism (7) together constitute the reciprocating drive system for moving the clamping device (1); The movement trajectory of the slide (6) is back and forth along the width direction of the sand belt (4), which is also back and forth along the width direction of the dust box (5); The clamping device (1) is equipped with a clamping mechanism for clamping the metal tile fixing screw (2). After clamping is completed, the threaded end face of the metal tile fixing screw (2) is exposed from below the clamping device (1). The belt sander (3) passes under the dust box (5) in the conveying direction of the sanding belt (4), thereby completing the mating structure where the grinding station is located below the range of motion of the assembly clamping device (1); The motor of the belt sander (3) drives the active roller, thereby driving the sanding belt (4) to run. At the same time, the clamping device (1) drives the metal tile fixing screw to move back and forth, thereby removing the riser residue (13) on the end face of the thread rod of the metal tile fixing screw (2) and trimming the end face of the thread rod of the metal tile fixing screw (2).

4. The grinding table for casting risers of combustion chamber metal tile fixing screws according to claim 3, characterized in that: The clamping mechanism has a vertical threaded hole that matches the metal tile fixing screw (2); An openable locking cover is provided above the threaded hole; Open the locking cover and screw the metal tile fixing screw (2) into the threaded hole through its own external thread, so that the riser residue (13) is exposed below the threaded hole. Secure the locking cover plate and press down the upper part of the metal tile fixing screw (2) to restrict rotation.

5. The grinding table for casting risers of combustion chamber metal tile fixing screws according to claim 1, characterized in that: The lower surface of the abrasive belt (4) located between the two closed-loop raised ribs (11) is coated with polytetrafluoroethylene; the roller surfaces of the two rollers of the belt sander (3) are coated with rubber, and the lower surface of the abrasive belt (4) located outside the two closed-loop raised ribs (11) is also coated with rubber, so that the area responsible for grinding and contacting the copper pad (8), i.e., between the two closed-loop raised ribs (11), is coated with a polytetrafluoroethylene coating with an extremely low coefficient of friction; while the area outside the two closed-loop raised ribs (11) responsible for power transmission and the roller surface are coated with a rubber coating.

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