Engine head polishing apparatus

Abstract

The application relates to the technical field of polishing equipment, in particular to engine upper cover polishing equipment, which comprises a manipulator, a grinding tool, a workbench, a bottom plate and a servo motor. Two workbenches for placing workpieces are symmetrically arranged on the bottom plate, and a servo motor for driving the bottom plate to rotate is arranged at the bottom of the bottom plate. A manipulator is arranged beside one of the workbenches, and a grinding tool is arranged at the tail end of the manipulator. A plurality of negative pressure devices are arranged on the two workbenches respectively and are used for fixing the workpieces, and the negative pressure devices do not interfere with the manipulator. The workpieces are fixed from the inside by the negative pressure devices, the problem that the existing polishing equipment clamps the outer sidewall of the workpiece by pneumatic clamping jaws, so that the surface of the workpiece to be polished cannot be completely exposed and the workpiece cannot be polished to the clamped position is solved, the workload of subsequent manual trimming is reduced, and the work efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polishing equipment, in particular to an engine upper cover polishing equipment. BACKGROUND

[0002] The robot polishing equipment mainly comprises a six-axis robot, a grinding tool, a workpiece fixing device and the like.

[0003] The engine upper cover is generally made of aluminum alloy, and the existing engine upper cover polishing equipment is provided with two worktables, one of which is in a working position and the other is in a feeding position, and a pneumatic clamping workpiece fixing device is designed on the worktables, the two worktables are connected through a bottom plate, the bottom plate is provided with a driving element for switching the positions of the two worktables, one of the worktables is fixedly provided with a robot, and the position of the robot is the working position.

[0004] Therefore, the engine upper cover polishing equipment is proposed, which fixes the workpiece from the inside and fully exposes the surface of the workpiece to be polished. SUMMARY

[0005] The present application aims to provide an engine upper cover polishing equipment, which is provided with a plurality of negative pressure devices on the worktable for fixing the workpiece, and the negative pressure devices do not interfere with the robot, thereby solving the problems in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] An engine upper cover polishing device, comprising a manipulator, a grinding tool, a workbench, a bottom plate, a servo motor and a bottom support, wherein the servo motor is installed on the bottom support, and the bottom plate is installed on the output end of the servo motor, two workbenches for placing workpieces are symmetrically installed on the bottom plate, only one workpiece is polished at a time, the workpiece to be polished is rotated to the working position by rotating the bottom plate through the servo motor, and the polished workpiece is rotated to the discharging position for removal, a manipulator is arranged beside the workbench in the working position, and a grinding tool is installed at the end of the manipulator, the manipulator polishes the surface of the workpiece through the grinding tool, and a negative pressure device is arranged below each workbench for fixing the workpiece, and the negative pressure device does not interfere with the manipulator, so that the polishing is completed at one time.

[0008] Preferably, the negative pressure device comprises a plurality of negative pressure cylinders fixedly installed on the bottom of the workbench through threads, rubber sheets are placed between the bottom of the workbench and the negative pressure cylinders to ensure the sealing property of the negative pressure cylinders, negative pressure holes connected with the negative pressure cylinders are formed in the workbench, the negative pressure holes are L-shaped, and the openings of the negative pressure holes are located on the side surface of the workbench, dust cloths are placed in the negative pressure holes when the polishing operation is not performed to avoid dust in the air from directly falling into the negative pressure holes after the workpiece is removed, a sealing groove is arranged at the opening of the negative pressure hole, the cross section of the sealing groove is rectangular, a sealing ring is fixedly installed in the sealing groove through glue, the cross section of the sealing ring is rectangular, the cross section area of the sealing ring should be at least 85% of the cross section area of the sealing groove, the width of the sealing groove must be greater than the maximum width of the sealing ring after compression deformation, the sealing ring should be higher than the sealing groove by 0.3-0.5 mm when the sealing ring is installed in the sealing groove to ensure that the sealing ring can completely contact the inner wall of the workpiece, a piston is slidably installed in the negative pressure cylinder, and a piston rod is fixedly installed at the bottom of the piston, the negative pressure cylinder is cylindrical and coaxially arranged with the piston, a U-shaped groove is formed in the side surface of the piston, and a rubber sealing element is installed in the U-shaped groove to improve the sealing property of the piston, a driving device and a large spring are jointly connected to the bottom of the piston rod, the servo motor drives the bottom plate to alternately rotate in the forward direction and the reverse direction to exchange the positions of the two workbenches, when the workbench in the feeding position is rotated to the working position, the driving device drives the piston rod to move downward to form negative pressure in the negative pressure cylinder to fix the workpiece, and when the workbench in the working position is rotated to the feeding position, the large spring can reset the piston rod to release the fixation of the workpiece.

[0009] Preferably, the driving device includes a guide rod that is threadedly fixed to the base plate, and the guide rod is placed vertically. Its top is also threadedly fixed to the bottom of the worktable. A connecting frame is slidably mounted on the guide rod, and a guide sleeve is provided at the interface between the connecting frame and the guide rod. The guide sleeve prevents the connecting frame from directly rubbing against the rack and thus prevents wear, protecting the integrity of the connecting frame. The guide sleeve is made of a material with a lower hardness than the rack, which also prevents excessive wear on the guide rod. The piston rods are all fixedly mounted on the connecting frame. The movement of the piston rods can be synchronously controlled through the connecting frame to keep the pressure in the negative pressure cylinder consistent and ensure the stability of the workpiece fixation. The servo motor is externally fixed. The device is fitted with an outer shell, which remains fixed. Flexible ropes are fixedly connected to each connecting frame, with both ropes passing through the base plate, secured by buckles, and fixed to the outer shell. The connection points are located on the outer shell away from the robotic arm. When the base plate rotates, a negative pressure cylinder on the worktable at the working position creates negative pressure to fix the workpiece. Simultaneously, a piston on the worktable at the unloading position resets, releasing the workpiece. Two rollers that cooperate with the flexible ropes are symmetrically installed at the bottom of the base plate to prevent direct contact between the ropes and the base plate, reducing wear between the ropes and the sharp edges of the base plate. A large spring for resetting the connecting frame is installed under the connecting frame, and the large spring is sleeved on a guide rod.

[0010] In use, place the workpiece to be polished on the worktable at the feeding position, start the servo motor to rotate the base plate and turn the worktable at the feeding position to the working position, exchanging positions with the worktable at the working position. At the same time, the soft rope that turns to the working position will be wrapped around the outer shell. The soft rope tightens and pulls down the connecting frame it is connected to. The connecting frame drives the piston rod to move downward, creating a negative pressure inside the worktable at the working position to fix the workpiece. At the same time, the soft rope of the worktable that turns to the feeding position is unwound from the outer shell, and the connecting frame returns to its original position under the action of the large spring, releasing the fixation of the workpiece that has been polished.

[0011] Preferably, a protective shell is threadedly fixed between the worktable and the base plate. The protective shell covers the negative pressure device, preventing dust from adhering to the guide rod and piston rod components, thus avoiding increased wear at their mating points and affecting their service life. Each negative pressure cylinder is connected to an air outlet pipe, which passes through the protective shell and extends above the workpiece. An air valve switch with a handle is installed on the air outlet pipe. A control block that mates with the air valve switch is threadedly fixed to the connecting frame. The control block has a rectangular hole that mates with the handle of the air valve switch. After the piston moves downward and blocks the air outlet pipe, the air valve switch is opened through the rectangular hole. The air valve switch allows the compressed gas at the bottom of the negative pressure cylinder to be discharged through the air outlet pipe and cleans the grinding dust adhering to the workpiece surface, reducing the amount of subsequent dust removal work. The piston height is 2-3 times the diameter of the air outlet pipe to ensure that the piston still blocks the air outlet pipe when the air valve switch is opened through the rectangular hole. After the piston returns to its original position, the air valve switch is closed through the rectangular hole.

[0012] Preferably, a one-way valve is fixedly installed at the bottom of each negative pressure cylinder, and a one-way valve is installed on the air outlet pipe. The one-way valve is used for air intake of the negative pressure cylinder, and the one-way valve prevents air from entering the negative pressure cylinder through the air outlet pipe, thus preventing dust from the outside air from directly entering the negative pressure cylinder through the air outlet pipe. Each protective shell is equipped with a filter tube, and a long strip of filter sponge is placed inside the filter tube. The filter sponge is used to filter dust in the air, and it is easy to replace the filter sponge after it is clogged by dust.

[0013] During use, the workpiece is fixed, and the control block moves downward along with the connecting frame. The piston moves downward and blocks the air outlet pipe. The piston continues to move downward, and the air valve opens under the action of the rectangular hole. Because the piston height is 2-3 times the diameter of the air outlet pipe, the piston still blocks the air pipe after the air valve is opened, compressing the gas in the negative pressure cylinder to the bottom of the cylinder. At this time, the workpiece is fixed and moved to the working position. When the workpiece is released after grinding, the piston moves upward to expose the air outlet pipe that was blocked by the piston. The compressed gas pushes open the second check valve and blows it onto the surface of the workpiece, removing the dust. When the compressed gas discharge is consistent with the external air pressure, the second check valve closes, and the piston continues to move upward. The negative pressure cylinder draws air into the protective shell through the first check valve. External gas enters the protective shell through the filter sponge of the filter tube. At this time, the workpiece is released, and the ground workpiece is moved to the loading position and removed manually.

[0014] Preferably, multiple pressure blocks are slidably mounted on the worktable, and each pressure block corresponds to a control block. The worktable has a slide rail that cooperates with the pressure block. An inclined slider is fixedly mounted on the end of the pressure block by welding. A small spring is fixedly mounted on the end of the inclined slider by welding, and the other end of the small spring is fixedly mounted on the end of the slide rail. A small cylinder that cooperates with the inclined slider is fixedly mounted on the top of the control block by welding. The small cylinder is used to fix the inclined slider, and the pressure block is used to further fix the workpiece.

[0015] In use, after the control block moves downward along with the connecting frame, the small cylinder releases the oblique slider, and the small spring pops out the pressure block to further fix the workpiece from the inside. After the control block moves upward along with the connecting frame, the small cylinder retracts the pressure block into the slide rail through the oblique slider, releasing the fixation of the workpiece.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. This invention solves the problem that existing grinding equipment, by setting multiple negative pressure devices on the worktable to fix the workpiece from the inside, cannot fully expose the surface of the workpiece to be ground and cannot grind the clamped position of the workpiece when the outer wall of the workpiece is clamped by pneumatic grippers. This reduces the amount of manual grinding required afterward, improves work efficiency, and reduces the time cost required for production.

[0018] 2. The present invention has multiple pressure blocks slidably installed on the worktable, and each pressure block corresponds to a control block. An inclined slider is fixedly installed at the end of the pressure block, and a small spring is installed at the end of the inclined slider. A small cylinder that cooperates with the inclined slider is installed on the top of the control block. When the control block and the piston rod move downward synchronously, the small cylinder will release the pressure block from being fixed. The pressure block will pop out under the action of the small spring, further fixing the workpiece.

[0019] 3. This invention connects an air outlet pipe to a negative pressure cylinder and controls the air valve switch via a control block. After the workpiece grinding is completed, the compressed gas in the negative pressure cylinder is automatically discharged from the air outlet pipe, and the grinding dust attached to the workpiece surface is cleaned, reducing the amount of subsequent dust removal work. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention when grinding a workpiece;

[0021] Figure 2 This is the front view of the present invention;

[0022] Figure 3 for Figure 2 An enlarged sectional view of part A;

[0023] Figure 4 for Figure 2An enlarged sectional view of part B;

[0024] Figure 5 for Figure 2 AA section view;

[0025] Figure 6 This is a schematic diagram of the negative pressure device structure of the present invention;

[0026] Figure 7 for Figure 6 Enlarged sectional view of section C;

[0027] Figure 8 This is a schematic diagram of the internal structure of the present invention;

[0028] Figure 9 for Figure 8 Enlarged view of part D;

[0029] Figure 10 This is a schematic diagram of the structure of the control block of the present invention for opening the gas valve switch.

[0030] In the diagram: 1. Robotic arm; 2. Grinding mold; 3. Worktable; 4. Base plate; 5. Servo motor; 6. Negative pressure cylinder; 7. Negative pressure hole; 8. Piston; 801. Piston rod; 9. Guide rod; 10. Connecting frame; 11. Housing; 12. Soft rope; 13. Large spring; 14. Air valve switch; 15. Control block; 1501. Rectangular hole; 16. Protective shell; 17. One-way valve one; 18. One-way valve two; 19. Filter tube; 20. Pressure block; 2001. Inclined slider; 2002. Small spring; 21. Small cylinder; 22. Roller; 23. Air outlet pipe; 24. Workpiece. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1, please refer to Figures 1 to 10 The technical solution is as follows:

[0033] An engine cover grinding device includes a robot arm 1, a grinding wheel 2, a worktable 3, a base plate 4, and a servo motor 5. The base plate 4 is mounted on the output end of the servo motor 5. Two worktables 3 for placing workpieces 24 are symmetrically mounted on the base plate 4. The workpieces 24 to be ground are rotated to the working position by rotating the base plate 4 through the servo motor 5. The robot arm 1 is located next to the worktable 3 at the working position, and the grinding wheel 2 is mounted on the end of the robot arm 1. The robot arm 1 grinds the surface of the workpiece 24 to be ground through the grinding wheel 2. A negative pressure device is provided on each of the two worktables 3 for fixing the workpieces 24. The negative pressure device does not interfere with the robot arm 1, so as to facilitate grinding in one go.

[0034] The negative pressure device includes multiple negative pressure cylinders 6 fixedly installed at the bottom of the workbench 3 by threads. A rubber sheet is placed between the bottom of the workbench 3 and the negative pressure cylinders 6. The workbench 3 has negative pressure holes 7 connected to the negative pressure cylinders 6. The negative pressure holes 7 are L-shaped, and the openings of the negative pressure holes 7 are located on the side of the workbench 3. A sealing groove is provided at the opening of the negative pressure hole 7, and the cross-section of the sealing groove is rectangular. A sealing ring is fixedly installed in the sealing groove with adhesive, and the cross-sectional area of ​​the sealing ring is at least 85% of the cross-sectional area of ​​the sealing groove. The width of the sealing groove must be greater than the maximum width of the sealing ring after compression deformation, and the sealing ring should be 0.3-0.5mm higher than the sealing groove when installed in the sealing groove to ensure that the sealing ring can fully contact the inner wall of the workpiece 24. A piston 8 is slidably installed in the negative pressure cylinder 6, and a piston rod 801 is fixedly installed at the bottom of the piston 8. The negative pressure cylinder 6 is cylindrical and coaxial with the piston 8. A U-shaped groove is opened on the side of the piston 8, and a rubber seal is installed in the U-shaped groove. The bottom of the piston rod 801 is connected to the drive device and the large spring 13.

[0035] The drive unit includes a guide rod 9 that is threadedly fixed to the base plate 4 and is placed vertically. Its top is also threadedly fixed to the bottom of the worktable 3. A connecting frame 10 is slidably mounted on the guide rod 9, and a guide sleeve is provided at the point where the connecting frame 10 mates with the guide rod 9. Piston rods 801 are all fixedly mounted on the connecting frame 10. The movement of the piston rods 801 can be synchronously controlled through the connecting frame 10 to maintain consistent pressure within the negative pressure chamber, ensuring the stability of the workpiece 24. The servo motor 5 is externally fixedly fitted with a housing 11, and the housing 11 remains fixed. Connecting rods 801 are all fixedly mounted on the connecting frame 10. Two soft ropes 12 are attached, and one end of each soft rope 12 passes through the base plate 4 and is fixedly connected to the outer shell 11 by a lock. The connection position is on the outer shell 11 away from the robot arm 1. When the base plate 4 rotates, the negative pressure cylinder 6 on the worktable 3 at the working position forms a negative pressure to fix the workpiece 24. At the same time, the piston 8 on the worktable 3 at the unloading position resets and releases the fixation of the workpiece 24. Two rollers 22 that cooperate with the soft ropes 12 are symmetrically installed at the bottom of the base plate 4. A large spring 13 for resetting the connecting frame 10 is installed under the connecting frame 10, and the large spring 13 is sleeved on the guide rod 9.

[0036] A protective shell 16 is fixedly installed between the workbench 3 and the base plate 4 by threads. The protective shell 16 covers the negative pressure device. Each negative pressure cylinder 6 is connected to an air outlet pipe 23, which passes through the protective shell 16 and extends to the top of the workpiece 24. An air valve switch 14 is installed on the air outlet pipe 23, and the air valve switch 14 has a handle. The air valve switch 14 can discharge the compressed gas at the bottom of the negative pressure cylinder 6 through the air outlet pipe 23.

[0037] A control block 15 that mates with the air valve switch 14 is fixedly installed on the connecting bracket 10 by threads. The control block 15 has a rectangular hole 1501 that mates with the handle of the air valve switch 14. After the piston 8 moves downward to block the air outlet pipe 23, the air valve switch 14 is opened through the rectangular hole 1501. The height of the piston 8 is 2-3 times the diameter of the air outlet pipe 23, so that when the air valve switch 14 is opened through the rectangular hole 1501, the piston 8 still blocks the air outlet pipe 23. After the piston 8 returns to its original position, the air valve switch 14 is closed through the rectangular hole 1501.

[0038] One-way valve 17 is fixedly installed at the bottom of the negative pressure cylinder 6. One-way valve 17 is used for air intake of the negative pressure cylinder 6. One-way valve 28 is installed on the air outlet pipe 23. One-way valve 28 prevents the negative pressure cylinder 6 from taking in air from the air outlet pipe 23. Filter tubes 19 are installed on the protective shell 16, and long strips of filter sponge are placed inside the filter tubes 19.

[0039] Multiple pressure blocks 20 are slidably mounted on the worktable 3, and each pressure block 20 corresponds to a control block 15. The worktable 3 has a slide rail that cooperates with the pressure block 20. An inclined slider 2001 is fixedly mounted on the end of the pressure block 20 by welding. A small spring 2002 is fixedly mounted on the end of the inclined slider 2001 by welding, and the other end of the small spring 2002 is fixedly mounted on the end of the slide rail. A small cylinder 21 that cooperates with the inclined slider 2001 is fixedly mounted on the top of the control block 15 by welding. The small cylinder 21 is used to fix the inclined slider 2001, and the pressure block 20 is used to further fix the workpiece 24.

[0040] The specific workflow is as follows:

[0041] Before starting work, dustproof cloths are placed inside the negative pressure holes 7 to prevent dust in the air from falling directly into the negative pressure holes 7 when there are no workpieces. Rotate the two worktables 3 to the loading position and the working position respectively. Fix the soft rope 12 of the worktable 3 in the loading position to the outer shell 11 with the buckle. Start the servo motor 5 to rotate forward. Exchange the positions of the two worktables 3. Continue to connect the soft rope 12 of the worktable in the loading position to the outer shell 11 with the buckle.

[0042] At the start of work, remove the dust cloth from the negative pressure hole 7 at the loading position, place the workpiece 24 to be polished on the worktable 3, start the servo motor 5 to reverse, and rotate the worktable 3 from the unloading position to the working position, exchanging positions with the worktable 3 in the working position. At the same time, the soft rope 12 that rotates to the working position will wrap around the outer shell 11, tighten the soft rope 12 and pull down the connecting bracket 10 connected to it. The connecting bracket 10 drives the piston rod 801 to move downward, so that the negative pressure cylinder 6 in the worktable 3 in the working position forms a negative pressure to fix the workpiece 24. 15 moves downwards along with the connecting frame 10. After the piston 8 moves downwards and blocks the air outlet pipe 23, it continues to move downwards. The air valve switch 14 opens under the action of the rectangular hole 1501. Because the height of the piston 8 is 2-3 times the diameter of the air outlet pipe 23, the air pipe is still blocked after the air valve switch 14 is opened, compressing the gas in the negative pressure cylinder 6 to the bottom of the cylinder. After the control block 15 moves downwards, the small cylinder 21 releases the oblique slider 2001, and the small spring 2002 pops out the pressure block 20 to further fix the workpiece 24 from inside the workpiece 24, and the workpiece 24 is then in the working position. During grinding, the soft rope 12 of the worktable 3 at the material feeding position is unwound from the outer casing 11. The connecting frame 10 returns to its original position under the action of the large spring 13. The dustproof cloth inside the negative pressure hole 7 at the loading position is removed again. The workpiece 24 to be ground is placed on the worktable 3. The servo motor 5 is started to rotate forward. The positions of the two worktables 3 are exchanged again. When the soft rope 12 of the worktable 3 at the material feeding position is unwound from the outer casing 11, the piston 8 moves upward to expose the air outlet pipe 23 blocked by the piston 8. The compressed gas pushes open the one-way valve 18 and blows it onto the surface of the workpiece 24. The dust on the surface of part 24 is blown away. When the compressed gas is discharged and the pressure is consistent with the outside air pressure, the one-way valve 18 closes and the piston 8 continues to move upward. The negative pressure cylinder 6 draws air into the protective shell 16 through the one-way valve 17. The outside air enters the protective shell 16 through the filter sponge of the filter tube 19. At this time, the negative pressure in the negative pressure cylinder 6 disappears. The small cylinder 21 retracts the pressure block 20 into the slide rail through the inclined slider 2001, releasing the fixation on the workpiece 24. The workpiece 24 that has been polished is moved to the loading position and the workpiece 24 is removed manually. This cycle continues until all the work is completed.

[0043] After completing the work, place a dustproof cloth in each of the negative pressure holes 7 to prevent dust in the air from falling directly into the negative pressure holes 7 when there is no workpiece 24. Open the buckle to release the connection between the soft rope 12 and the outer shell 11.

[0044] Example 2, please refer to Figures 1 to 10 The technical solution is as follows:

[0045] Unlike Embodiment 1, the bottom of the air outlet pipe 23 in Embodiment 2 is a retractable circular sleeve. The distance between the air outlet pipe 23 and the worktable 3 can be adjusted according to the size of the robot arm 1. A suitable distance can be selected according to the actual working scenario. However, the dust on the circular sleeve should be cleaned regularly to avoid dust accumulation, which would affect the extension and retraction of the circular sleeve.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An engine cover grinding device, comprising: a robotic arm (1), a grinding wheel (2), a worktable (3), a base plate (4), a servo motor (5), and a bottom support, wherein, A servo motor (5) is installed on the bottom support, and a base plate (4) is installed on the output end of the servo motor (5). Two worktables (3) for placing workpieces (24) are symmetrically installed on the base plate (4). The two worktables (3) are located at the loading position and the working position, respectively. A robot arm (1) is set next to the worktable (3) located at the working position, and a mold (2) is installed at the end of the robot arm (1). Its characteristic is that it further includes: Negative pressure device: Each of the two workbenches (3) is provided with a negative pressure device for fixing from the inside of the workpiece (24); a protective shell (16) is fixedly installed at the bottom of each workbench (3), and a filter tube (19) is installed on each of the protective shells (16), and a long strip of filter sponge is placed inside the filter tube (19); The negative pressure device includes multiple negative pressure cylinders (6) fixedly installed at the bottom of the workbench (3). Each negative pressure cylinder (6) is connected to an air outlet pipe (23). An air valve switch (14) is installed on the air outlet pipe (23). A control block (15) that cooperates with the air valve switch (14) is fixedly installed on the connecting frame (10). A rectangular hole (1501) that cooperates with the handle of the air valve switch (14) is opened in the control block (15). A one-way valve (17) is fixedly installed at the bottom of each negative pressure cylinder (6). A one-way valve (18) is installed on the air outlet pipe (23). Multiple pressure blocks (20) are slidably installed on the worktable (3), and the multiple pressure blocks (20) correspond one-to-one with multiple control blocks (15). An inclined slider (2001) is fixedly installed at the end of the pressure block (20), and a small spring (2002) is installed at the end of the inclined slider (2001). A small cylinder (21) that cooperates with the inclined slider (2001) is installed on the top of the control block (15), and the small cylinder (21) is used to fix the inclined slider (2001).

2. The engine cover grinding equipment according to claim 1, characterized in that: Each workbench (3) is provided with a negative pressure hole (7) connected to a negative pressure cylinder (6). A piston (8) is slidably installed in the negative pressure cylinder (6), and a piston rod (801) is fixedly installed at the bottom of the piston (8). The bottom of the piston rod (801) is connected to a drive device and a large spring (13). The servo motor (5) drives the base plate (4) to rotate alternately in the forward and reverse directions, exchanging the positions of the two workbenches (3). When the workbench (3) in the loading position turns to the working position, the drive device drives the piston rod (801) to move downward to form a negative pressure in the negative pressure cylinder (6) to fix the workpiece (24). When the workbench (3) in the working position turns to the loading position, the large spring (13) can reset the piston rod (801) to release the workpiece (24) from being fixed.

3. The engine cover grinding equipment according to claim 2, characterized in that: The drive device includes a guide rod (9) mounted on the base plate (4), a connecting frame (10) is slidably mounted on the guide rod (9), and piston rods (801) are fixedly mounted on the connecting frame (10). The servo motor (5) is fitted with a housing (11). A soft rope (12) is fixedly connected to the connecting frame (10), and one end of the soft rope (12) passes through the base plate (4) and is finally fixed to the housing (11). A large spring (13) for resetting the connecting frame (10) is installed under the connecting frame (10).

4. The engine cover grinding equipment according to claim 2, characterized in that: Each of the negative pressure holes (7) is equipped with a sealing ring.

5. The engine cover grinding equipment according to claim 3, characterized in that: The bottom of the base plate (4) is symmetrically equipped with two rollers (22) that cooperate with the soft rope (12).

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