Double-station driving type inner-outer circle compound grinding machine

Abstract

The application relates to the field of grinding machines, in particular to a double-station driving type inner-outer circle composite grinding machine. The double-station driving type inner-outer circle composite grinding machine comprises a base, a rotating table rotatably connected to the top end of the base, a polishing mechanism arranged on the side wall of the base, the polishing mechanism being used for polishing the inner and outer surfaces of a workpiece, and two clamping devices symmetrically arranged on the top end of the rotating table. The double-station driving type inner-outer circle composite grinding machine is provided with a rotating table, a driving disc and a clamping block. During the machining process, when a certain clamping block rotates to a position close to the polishing mechanism, a corresponding pushing mechanism is started, the mechanism drives a U-shaped rack, a second gear and a first gear, and finally transmits the movement to a first rack, so that the clamping block close to the polishing mechanism is specified, the clamping block actively gives out the surface of the workpiece which is shielded, and the polishing mechanism can polish the clamping position, thereby reducing the polishing dead angle.

Description

Technical Field

[0001] This invention relates to the field of grinding machines, and more particularly to a dual-station driven internal and external cylindrical composite grinding machine. Background Technology

[0002] Grinding technology is an ancient machining technique. With the advent of the information age and the continuous development of science and technology, grinding technology has become a dynamic and ever-evolving field, and its importance in grinding processing has grown significantly. CNC internal and external cylindrical grinding machines have experienced rapid development due to their ability to achieve high workpiece dimensional accuracy and surface quality. As machining levels improve, grinding machines occupy an increasingly larger proportion of machining bases, and CNC grinding machines play an irreplaceable role in modern grinding processing.

[0003] Currently, the common practice is to use multi-jaw chucks or special fixtures to hold the ring-shaped workpiece in place. However, this fixed clamping will block the area of ​​the workpiece near the clamping point, forming a machining dead zone, which will prevent the grinding tool from effectively covering the area.

[0004] To address these issues, this invention proposes a dual-station driven internal and external cylindrical composite grinding machine. Summary of the Invention

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a dual-station driven internal and external cylindrical composite grinding machine, comprising a base, a rotary table rotatably connected to the top of the base, a grinding mechanism provided on the side wall of the base, the grinding mechanism being used to grind the inner and outer surfaces of the workpiece, and two clamping devices symmetrically arranged on the top of the rotary table, each clamping device comprising: An annular shell is fixedly connected to the top of a rotating platform. A drive disk is rotatably connected inside the annular shell. Several clamping blocks are slidably connected in an annular array on the side wall of the drive disk. A first rack is fixedly connected to the end of each clamping block. A first gear that meshes with the first rack is rotatably connected to the side wall of the drive disk. Two second gears are symmetrically fixedly connected to both ends of the first gear shaft. A U-shaped rack frame is slidably connected to the side wall of the drive disk. The top of the U-shaped rack frame meshes with the two second gears. Several pushing mechanisms, as the clamping block approaches the grinding mechanism, push the U-shaped rack frame to move, so that the designated clamping block moves away from the workpiece to make room.

[0006] Preferably, it also includes a sliding seat, which slides within the annular shell and is driven to move by an electric cylinder. The sliding seat is equipped with a first motor that drives the drive disc to rotate, and several of the pushing mechanisms are arranged on the side wall of the sliding seat.

[0007] Preferably, the actuating mechanism includes: A drive block is fixedly connected to the side wall of a U-shaped rack frame. The side wall of the drive block is provided with a drive groove, which includes a vertical groove and a first inclined groove. The telescopic frame has its top end slidably connected to the side wall of the sliding seat, and its bottom end is fixedly connected to a linkage frame. The bottom end of the linkage frame is fixedly connected to a first drive pin, which is slidably connected in a drive groove. The guide groove is formed on the side wall of the sliding seat. The side wall of the linkage frame is fixedly connected to a second drive pin, which is slidably connected in the guide groove. As the clamping block approaches the grinding mechanism, the linkage frame is driven to move away from the center of the drive plate under the guidance of the path of the guide groove.

[0008] Preferably, it also includes a connecting plate, which is slidably connected to the inner wall of the bottom end of the clamping block. A pressure sensor is provided at the bottom end of the connecting plate, and a fixing block is fixedly connected to the bottom end of the pressure sensor. A rubber pad is fixedly connected to the bottom end of the fixing block.

[0009] Preferably, the device further includes a screw and a connecting rod. The bottom end of the screw is rotatably connected to a connecting plate, and the connecting plate is slidably connected to the clamping block. The top end of the screw passes through the top end of the clamping block and is threadedly connected to the clamping block. A third gear is slidably inserted into the top end of the screw and is rotatably connected to the clamping block. The top end of the connecting rod is set on an annular shell, and the bottom end is fixedly connected to an arc-shaped rack. As the clamping block moves away from the workpiece, the third gear meshes with the arc-shaped rack to drive the screw to rotate.

[0010] Preferably, it also includes a fourth gear, which is coaxially fixedly connected to the bottom end of the third gear and rotatably connected to the top end of the clamping block. A second rack is meshed on the side of the fourth gear, and the second rack is slidably connected to the top end of the clamping block. A compression spring is fixedly connected between the second rack and the clamping block. A limit component is provided on the clamping block to limit the reset of the second rack.

[0011] Preferably, the limiting component includes a fifth gear that meshes with a second rack. A ratchet is fixedly connected to the shaft of the fifth gear, and a locking block is engaged with the side of the ratchet. The locking block is rotatably connected to a clamping block, and a torsion spring is connected between the locking block and the clamping block. A toggle mechanism is provided on the clamping block, and the toggle mechanism toggle the locking block to rotate during the reset movement of the sliding seat.

[0012] Preferably, the actuating mechanism includes a push block, which is fixedly connected to the rotating shaft of the clamping block. A push plate is slidably connected to the top of the clamping block, and a sliding plate is slidably connected to the end of the push plate after passing through the drive disk. The top of the sliding plate is slidably connected to the sliding seat.

[0013] Preferably, it further includes a folded connecting shell, one end of which passes through the annular shell and is fixedly connected to the annular shell, the top end of the connecting rod is sealed and slidably connected inside the folded connecting shell, and a piston is sealed and slidably connected inside the bottom end of the folded connecting shell, the rod of the piston being fixedly connected to the side wall of the sliding seat.

[0014] Preferably, the guide groove includes a first arc-shaped groove and a second arc-shaped groove, the radius of the first arc-shaped groove is smaller than that of the second arc-shaped groove, and the second arc-shaped groove and the first arc-shaped groove are connected by a guide groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention, by setting up a rotary table, a drive disk, and clamping blocks, allows a pushing mechanism corresponding to a certain position to be activated when a clamping block rotates with the workpiece to a position close to the grinding mechanism during the processing. This mechanism drives the U-shaped rack frame, the second gear, and the first gear, ultimately transmitting the motion to the first rack. This designates the clamping block closest to the grinding mechanism to actively give way to the workpiece surface it was blocking, ensuring that the grinding mechanism can grind the clamped part and reduce grinding dead angles.

[0016] This invention incorporates a pressure sensor, a screw, a third gear, and an arc-shaped rack. As the third gear moves away from the workpiece, it meshes with the arc-shaped rack, causing the third gear to rotate. This rotational motion is transmitted to the screw. Since the screw is threadedly connected to the clamping block body, and the bottom of the screw is rotatably connected to the connecting plate, the rotation of the screw pushes the fixed block a short distance away from the clamping block body. When the next clamping cycle begins, the fixed block extends to compensate for the missing radius dimension during workpiece grinding, thus maintaining a constant clamping force on the workpiece.

[0017] This invention, by setting up a ratchet, a locking block, a compression spring, and a toggle mechanism, allows the sliding seat to move to its initial position when the grinding of the entire workpiece is completed. During the process of the sliding seat moving to the reset position, the push plate slides along the top of the clamping block, causing the end of the push plate to contact the push block, lifting the head of the locking block from the tooth groove of the ratchet, releasing the ratchet from its lock, and causing the compressed spring to immediately release its energy. The second rack resets, and finally, the screw rotates in the opposite direction. The reverse rotation of the screw causes the fixed block to retract into the clamping block, returning to its initial position. This helps to avoid multiple compensations, which would cause the overextended clamping head to be unable to adapt to the initial large radius of the new workpiece and thus fail to clamp it effectively. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the connection between the annular shell and the drive disk of the present invention; Figure 3This is a cross-sectional view of the annular shell of the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view at point B in the middle; Figure 6 This is a schematic diagram showing the connection between the drive disk and the U-shaped rack frame of the present invention; Figure 7 This is a schematic diagram showing the connection between the sliding seat and the U-shaped rack frame in this invention; Figure 8 This is a schematic diagram showing the connection between the U-shaped rack frame and the clamping block in this invention; Figure 9 This is a schematic diagram showing the connection between the connecting plate and the fixing block in this invention; Figure 10 This is a schematic diagram showing the connection between the sliding seat and the guide groove in this invention.

[0019] In the diagram: 1. Base; 2. Rotary table; 3. Annular shell; 4. Drive disk; 5. Clamping block; 6. First rack; 7. First gear; 8. Second gear; 9. U-shaped rack frame; 10. Sliding seat; 11. Guide groove; 11. First arc groove 1101; 11. Second arc groove 1102; Guide groove 1103; Electric cylinder; 12. First motor; 13. Drive block; 14. Drive groove 1401; Telescopic frame; 15. Linkage frame; 16. First drive pin 1601; Second drive pin 1602; Connecting plate; 17. 18. Pressure sensor, 19. Fixing block, 20. Rubber pad, 21. Screw, 22. Third gear, 23. Folded connecting shell, 24. Piston, 25. Connecting rod, 26. Arc rack, 27. Fourth gear, 28. Second rack, 29. Compression spring, 30. Fifth gear, 31. Ratchet, 32. Locking block, 33. Torsion spring, 34. Pushing block, 35. Pushing plate, 36. Sliding plate, 37. Support plate, 38. Mounting bracket, 39. Cylinder, 40. Slider, 41. Grinding roller, 42. Second motor. Detailed Implementation

[0020] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0021] like Figures 1 to 10 The dual-station driven internal and external cylindrical composite grinding machine shown includes a base 1, a rotary table 2 rotatably connected to the top of the base 1, a grinding mechanism provided on the side wall of the base 1 for grinding the inner and outer surfaces of the workpiece, and two clamping devices symmetrically arranged on the top of the rotary table 2, each clamping device including: An annular shell 3 is fixedly connected to the top of the rotating platform 2. A drive disk 4 is rotatably connected inside the annular shell 3. Several clamping blocks 5 are slidably connected in an annular array on the side wall of the drive disk 4. A first rack 6 is fixedly connected to the end of the clamping block 5. A first gear 7 that meshes with the first rack 6 is rotatably connected to the side wall of the drive disk 4. Two second gears 8 are symmetrically fixedly connected to both ends of the shaft of the first gear 7. A U-shaped rack frame 9 is slidably connected to the side wall of the drive disk 4. The top of the U-shaped rack frame 9 meshes with the two second gears 8. Several pushing mechanisms, as the clamping block 5 approaches the grinding mechanism, push the U-shaped rack frame 9 to move, so that the designated clamping block 5 moves away from the workpiece to make room; It also includes a sliding seat 10, which slides inside the annular shell 3 and is driven to move by an electric cylinder 12. The sliding seat 10 is equipped with a first motor 13 that drives the drive disk 4 to rotate, and several pushing mechanisms are arranged on the side wall of the sliding seat 10. It should be noted that the output shaft of the first motor 13 is slidably connected to the drive disk 4; Specifically, in existing technologies, the common practice is to use a multi-jaw chuck or a special fixture to hold the ring-shaped workpiece in place. However, this fixed clamping method obstructs the area of ​​the workpiece near the clamping point, creating a machining dead zone, which prevents the grinding tool from effectively covering this area. This technical solution can solve the above problem, and the specific operation is as follows: The workpiece to be polished is placed on the drive plate 4, and then the electric cylinder 12 is started. The telescopic rod of the electric cylinder 12 drives the sliding seat 10 to move. Under the connection of several pushing mechanisms, several U-shaped rack frames 9 are moved, thereby driving the second gear 8 to rotate. The first gear 7 rotates synchronously. Under the meshing action, the first gear 7 drives the first rack 6 and the clamping block 5 to move downward synchronously, thereby clamping the workpiece. After the workpiece is clamped, the rotary table 2 is driven to rotate 180 degrees by the geared motor in the machine base, and the clamped workpiece is rotated to the grinding mechanism. At the same time, another idle station is switched to the loading and unloading position. In the grinding station, the first motor 13 is started. The first motor 13 drives the drive disk 4 and all the clamping blocks 5 on it and the workpiece to rotate together around the central axis of the drive disk 4. This uniform rotation motion allows the entire circumferential surface of the workpiece to pass through the grinding mechanism in sequence, realizing continuous grinding of the outer circle or inner hole of the workpiece. During the process of the clamping block 5 driving the workpiece to rotate, as the clamping block 5 approaches the grinding mechanism, the U-shaped rack frame 9 is pushed to move by the pushing mechanism at the corresponding position, causing the second gear 8 to rotate and the first gear 7 to rotate synchronously. This causes the clamping block 5 at the corresponding position to move upward and away from the outer wall of the workpiece, thereby exposing the clamping part to make way and ensuring that the grinding mechanism can grind the clamping part and reduce grinding dead angles.

[0022] As a further embodiment of the present invention, the driving mechanism includes: The drive block 14 is fixedly connected to the side wall of the U-shaped rack frame 9. The side wall of the drive block 14 is provided with a drive groove 1401, which includes a vertical groove and a first inclined groove. The telescopic frame 15 has its top end slidably connected to the side wall of the sliding seat 10, and its bottom end is fixedly connected to a linkage frame 16. The bottom end of the linkage frame 16 is fixedly connected to a first drive pin 1601, which is slidably connected to the drive groove 1401. Guide groove 11 is formed on the side wall of sliding seat 10. The second drive pin 1602 is fixedly connected to the side wall of linkage frame 16. The second drive pin 1602 is slidably connected in the guide groove 11. When clamping block 5 approaches the grinding mechanism, under the path guidance of guide groove 11, the linkage frame 16 is driven to move away from the center of drive disk 4. The guide groove 11 includes a first arc-shaped groove 1101 and a second arc-shaped groove 1102. The radius of the first arc-shaped groove 1101 is smaller than that of the second arc-shaped groove 1102. The second arc-shaped groove 1102 and the first arc-shaped groove 1101 are connected by a guide groove 1103. Specifically, during the non-yielding phase, the second drive pin 1602 on the linkage frame 16 is located in the first arc-shaped groove 1101 portion of the guide groove 11, and at this time the first drive pin 1601 is located in the vertical groove portion of the drive groove 1401 of the drive block 14. As the drive disk 4 rotates, causing the clamping block 5 that needs to be moved to gradually approach the grinding mechanism, the entire first push mechanism linked to it also rotates to a specific angle position. At this time, under the path constraint of the guide groove 11, the second drive pin 1602 on the linkage frame 16 moves from the first arc groove 1101 through the guide groove 1103 into the second arc groove 1102 with a larger radius. Due to the change in the radius of the groove, a thrust is generated on the second drive pin 1602. Under the action of this thrust, the entire linkage frame 16 moves away from the center of the drive disk 4, and at the same time drives the first drive pin 1601 to move synchronously. During the movement of the first drive pin 1601, the first drive pin 1601 first enters the first inclined groove from the vertical groove of the drive groove 1401. The inclined surface of the first inclined groove drives the drive block 14 and the U-shaped rack frame 9 fixed thereto to move linearly. The linear movement of the U-shaped rack frame 9 drives the two second gears 8 to rotate. Subsequently, through the first gear 7, the first rack 6 and other transmission components, the corresponding clamping block 5 is finally moved away from the workpiece, completing the relocation action. As the clamping block 5 continues to rotate with the drive disk 4 and gradually leaves the grinding area, the second drive pin 1602, guided by the guide groove 11, returns from the second arc groove 1102 to the first arc groove 1101 via the guide groove 1103. During this process, the first drive pin 1601 slides back to the vertical groove along the first inclined groove, and the drive block 14 and the U-shaped rack 9 reset synchronously, and the clamping block 5 resets to re-clamp the workpiece.

[0023] As a further embodiment of the present invention, it also includes a connecting plate 17, which is slidably connected to the inner wall of the bottom end of the clamping block 5. A pressure sensor 18 is provided at the bottom end of the connecting plate 17, and a fixing block 19 is fixedly connected to the bottom end of the pressure sensor 18. A rubber pad 20 is fixedly connected to the bottom end of the fixing block 19. Specifically, when the electric cylinder 12 drives the sliding seat 10 and the clamping block 5 to move towards the workpiece for clamping, the rubber pad 20 first contacts the workpiece surface. As the clamping force is continuously applied, the pressure value obtained by the pressure sensor 18 increases. When it increases to the threshold, the pressure sensor 18 transmits the pressure information to the control system of the peripheral device (such as a PLC or industrial computer). After receiving the signal, the control system shuts down the electric cylinder 12, which is beneficial for adapting to workpieces of different sizes.

[0024] As a further embodiment of the present invention, it also includes a screw 21 and a connecting rod 25. The bottom end of the screw 21 is rotatably connected to the connecting plate 17, and the connecting plate 17 is slidably connected to the clamping block 5. The top end of the screw 21 passes through the top end of the clamping block 5 and is threadedly connected to the clamping block 5. A third gear 22 is slidably inserted into the top end of the screw 21. The third gear 22 is rotatably connected to the clamping block 5. The top end of the connecting rod 25 is set on the annular shell 3, and the bottom end is fixedly connected to an arc-shaped rack 26. As the clamping block 5 moves away from the workpiece, the third gear 22 meshes with the arc-shaped rack 26 to drive the screw 21 to rotate. Specifically, during the grinding process, the outer diameter of the workpiece gradually decreases, causing the pressure on the workpiece to decrease after the clamping block 5 resets and clamps it, which can easily lead to loosening of the clamp. This technical solution can solve the above problem, and the specific operation is as follows: As the clamping block 5 approaches the grinding mechanism, the clamping block 5, along with the third gear 22, moves away from the workpiece. During this process, the third gear 22 meshes with the arc-shaped rack 26, causing it to rotate. The third gear 22 transmits the rotational motion to the screw 21 through its internal sliding keyway and other structures. Since the screw 21 is threadedly connected to the body of the clamping block 5, and the bottom end of the screw 21 is rotatably connected to the connecting plate 17, the rotation of the screw 21 will push the fixed block 19 a short distance away from the body of the clamping block 5. After the clamping block 5 resets and re-clamps the workpiece, since the clamping head has already "protruded" beforehand, it can contact the workpiece surface with a smaller radius earlier. This automatically compensates for the gap caused by the reduced workpiece radius during the grinding process, which helps to ensure a constant clamping force.

[0025] As a further embodiment of the present invention, it also includes a fourth gear 27, which is coaxially fixedly connected to the bottom end of the third gear 22 and rotatably connected to the top end of the clamping block 5. A second rack 28 is meshed on the side of the fourth gear 27 and slidably connected to the top end of the clamping block 5. A compression spring 29 is fixedly connected between the second rack 28 and the clamping block 5. A limit component is provided on the clamping block 5 to limit the reset of the second rack 28. The limiting component includes a fifth gear 30, which meshes with a second rack 28. A ratchet 31 is fixedly connected to the shaft of the fifth gear 30. A locking block 32 is engaged on the side of the ratchet 31. The locking block 32 is rotatably connected to the clamping block 5. A torsion spring 33 is connected between the locking block 32 and the clamping block 5. A toggle mechanism is provided on the clamping block 5. The toggle mechanism toggle the locking block 32 to rotate during the reset movement of the sliding seat 10. The actuating mechanism includes a push block 34, which is fixedly connected to the rotating shaft of the clamping block 32. A push plate 35 is slidably connected to the top of the clamping block 5. The end of the push plate 35 passes through the drive disk 4 and is slidably connected to a sliding plate 36. The top of the sliding plate 36 is slidably connected to the sliding seat 10. Specifically, during the rotation of the third gear 22 in mesh with the arc-shaped rack 26, the fourth gear 27 rotates synchronously and drives the second rack 28 to move. The compression spring 29 generates elastic force. During the movement of the second rack 28, the second rack 28 drives the fifth gear 30 and the ratchet 31 coaxial with it to rotate. When the third gear 22 disengages from the arc-shaped rack 26, the ratchet 31 is restricted by the locking block 32, thus preventing the compression spring 29 from returning to its original position. Once the grinding of the entire workpiece is complete, the control system drives the electric cylinder 12 to move the sliding seat 10 to its initial position. During the movement of the sliding seat 10 to its reset position, the sliding plate 36 pulls the push plate 35, causing the push plate 35 to slide along the top of the clamping block 5. The end of the push plate 35 contacts the push block 34, forcing the locking block 32 to rotate around its axis. This overcomes the force of the torsion spring 33, lifting the head of the locking block 32 from the tooth groove of the ratchet 31, thus releasing the lock on the ratchet 31. The ratchet 31 is now unlocked, and the previously compressed... The compression spring 29 immediately releases energy, pushing the second rack 28 to move linearly. The second rack 28 drives the fourth gear 27 to rotate in the opposite direction (opposite to the direction of compensation). The fourth gear 27 drives the third gear 22 to rotate in the opposite direction as well. The reverse rotation of the third gear 22 causes the screw 21 to rotate in the opposite direction. The reverse rotation of the screw 21 will cause the fixed block 19 to retract into the clamping block 5 and return to the initial position. This helps to avoid multiple compensations, which would cause the over-protruding clamping head to be unable to adapt to the initial large radius of the new workpiece and unable to clamp effectively.

[0026] As a further embodiment of the present invention, it also includes a folded connecting shell 23, one end of which passes through the annular shell 3 and is fixedly connected to the annular shell 3. The top end of the connecting rod 25 is sealed and slidably connected inside the folded connecting shell 23, and the bottom end of the folded connecting shell 23 is sealed and slidably connected to a piston 24. The rod of the piston 24 is fixedly connected to the side wall of the sliding seat 10. Specifically, when clamping workpieces of different sizes, the electric cylinder 12 drives the sliding seat 10 to move a different distance (the smaller the workpiece size, the greater the moving distance of the sliding seat 10). During the movement of the sliding seat 10, the piston 24 rod drives the piston 24 to move synchronously in the bottom sealed cavity of the folded connecting shell 23, compressing the folded connecting shell 23 and the air inside it. The air pressure pushes the connecting rod 25 and the arc-shaped rack 26 to move, so that the arc-shaped rack 26 can adaptively adjust its height according to the workpiece size, ensuring that the arc-shaped rack 26 can always mesh with the third gear 22.

[0027] As a further embodiment of the present invention, the grinding mechanism includes a support plate 37 and a mounting frame 38. A cylinder 39 is fixedly connected to the side wall of the base 1. The top end of the telescopic rod of the cylinder 39 is fixedly connected to the bottom end of the support plate 37. The mounting frame 38 slides along the top end of the support plate 37 through a linear drive mechanism. Two sliders 40 are symmetrically arranged on the upper and lower sides of the side wall of the mounting frame 38. A grinding roller 41 is rotatably connected inside each of the two sliders 40. A second motor 42 is fixedly connected to the side wall of the slider 40. The output shaft of the second motor 42 is fixedly connected to the grinding roller 41. Specifically, by activating cylinder 39, the support plate 37 and the entire grinding head assembly are driven to move up and down as a whole, adjusting the upper and lower grinding rollers 41 to the correct height position that matches the inner hole and outer circle of the workpiece. Then, through a linear drive mechanism such as a lead screw slider 40 driven by a servo motor, the mounting bracket 38 is driven to make a horizontal radial feed motion along the support plate 37, so that the upper and lower grinding rollers 41 contact and press against the outer circle and inner hole surface of the workpiece, respectively. Then, two second motors 42 are activated, which drive the upper and lower grinding rollers 41 to rotate at high speed, forming the main cutting motion, and simultaneously performing one-time forming grinding on the inner circle and outer circle of the workpiece, thereby improving processing efficiency.

[0028] The working principle of this invention is as follows: The workpiece to be polished is placed on the drive plate 4, and then the electric cylinder 12 is started. The telescopic rod of the electric cylinder 12 drives the sliding seat 10 to move. Under the connected action of several pushing mechanisms, several U-shaped rack frames 9 are moved, thereby driving the second gear 8 to rotate. The first gear 7 rotates synchronously. Under the meshing action, the first gear 7 drives the first rack 6 and the clamping block 5 to move downward synchronously, thereby clamping the workpiece. After the workpiece is clamped, the rotary table 2 is driven to rotate 180 degrees by the geared motor in the machine base, and the clamped workpiece is rotated to the grinding mechanism. At the same time, another idle station is switched to the loading and unloading position. In the grinding station, the first motor 13 is started. The first motor 13 drives the drive disk 4 and all the clamping blocks 5 on it and the workpiece to rotate together around the central axis of the drive disk 4. This uniform rotation motion allows the entire circumferential surface of the workpiece to pass through the grinding mechanism in sequence, realizing continuous grinding of the outer circle or inner hole of the workpiece. During the process of the clamping block 5 driving the workpiece to rotate, as the clamping block 5 approaches the grinding mechanism, the U-shaped rack frame 9 is pushed to move by the pushing mechanism at the corresponding position, causing the second gear 8 to rotate and the first gear 7 to rotate synchronously. This causes the clamping block 5 at the corresponding position to move upward and away from the outer wall of the workpiece, thereby exposing the clamping part to make way and ensuring that the grinding mechanism can grind the clamping part and reduce grinding dead angles.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A dual-station driven internal and external cylindrical composite grinding machine, comprising a base (1), a rotary table (2) rotatably connected to the top of the base (1), a grinding mechanism provided on the side wall of the base (1), the grinding mechanism being used to grind the inner and outer surfaces of the workpiece, and two clamping devices symmetrically provided on the top of the rotary table (2), characterized in that, Each of the clamping devices includes: An annular shell (3) is fixedly connected to the top of the rotating platform (2). A drive disk (4) is rotatably connected inside the annular shell (3). Several clamping blocks (5) are slidably connected in an annular array on the side wall of the drive disk (4). A first rack (6) is fixedly connected to the end of the clamping block (5). A first gear (7) that meshes with the first rack (6) is rotatably connected to the side wall of the drive disk (4). Two second gears (8) are symmetrically fixedly connected to both ends of the shaft of the first gear (7). A U-shaped rack frame (9) is slidably connected to the side wall of the drive disk (4). The top of the U-shaped rack frame (9) meshes with the two second gears (8). Several pushing mechanisms push the U-shaped rack frame (9) to move as the clamping block (5) approaches the grinding mechanism, so that the designated clamping block (5) moves away from the workpiece to make room; Connecting plate (17), which is slidably connected to the inner wall of the bottom end of clamping block (5); The screw (21) and connecting rod (25) are connected to the connecting plate (17) at the bottom end of the screw (21) and threadedly connected to the clamping block (5) at the top end of the screw (21). A third gear (22) is slidably inserted into the top end of the screw (21) and is rotatably connected to the clamping block (5). The top end of the connecting rod (25) is set on the annular shell (3) and the bottom end is fixedly connected to the arc rack (26). As the clamping block (5) moves away from the workpiece, the third gear (22) meshes with the arc rack (26) to drive the screw (21) to rotate. It also includes a sliding seat (10), which slides inside the annular shell (3) and is driven to move by an electric cylinder (12). The sliding seat (10) is provided with a first motor (13) that drives the drive disk (4) to rotate, and several of the pushing mechanisms are arranged on the side wall of the sliding seat (10). The propulsion mechanism includes: A drive block (14) is fixedly connected to the side wall of the U-shaped rack frame (9). The side wall of the drive block (14) is provided with a drive groove (1401), which includes a vertical groove and a first inclined groove. Telescopic frame (15), the top of the telescopic frame (15) is slidably connected to the side wall of the sliding seat (10), the bottom of the telescopic frame (15) is fixedly connected to a linkage frame (16), the bottom of the linkage frame (16) is fixedly connected to a first drive pin (1601), and the first drive pin (1601) is slidably connected in the drive groove (1401); The guide groove (11) is opened on the side wall of the sliding seat (10). The second drive pin (1602) is fixedly connected to the side wall of the linkage frame (16). The second drive pin (1602) is slidably connected in the guide groove (11). When the clamping block (5) approaches the grinding mechanism, the linkage frame (16) is driven to move away from the center of the drive disk (4) under the path guidance of the guide groove (11).

2. The dual-station driven internal and external cylindrical composite grinding machine according to claim 1, characterized in that, A pressure sensor (18) is provided at the bottom of the connecting plate (17), and a fixing block (19) is fixedly connected to the bottom of the pressure sensor (18), and a rubber pad (20) is fixedly connected to the bottom of the fixing block (19).

3. The dual-station driven internal and external cylindrical composite grinding machine according to claim 2, characterized in that, It also includes a fourth gear (27), which is coaxially fixedly connected to the bottom end of the third gear (22). The fourth gear (27) is rotatably connected to the top end of the clamping block (5). The fourth gear (27) is meshed with a second rack (28) on its side. The second rack (28) is slidably connected to the top end of the clamping block (5). A compression spring (29) is fixedly connected between the second rack (28) and the clamping block (5). A limit component is provided on the clamping block (5) to limit the reset of the second rack (28).

4. A dual-station driven internal and external cylindrical composite grinding machine according to claim 3, characterized in that, The limiting component includes a fifth gear (30), which meshes with a second rack (28). A ratchet (31) is fixedly connected to the shaft of the fifth gear (30). A locking block (32) is engaged on the side of the ratchet (31). The locking block (32) is rotatably connected to the clamping block (5). A torsion spring (33) is connected between the locking block (32) and the clamping block (5). A toggle mechanism is provided on the clamping block (5). The toggle mechanism toggle the locking block (32) to rotate during the reset movement of the sliding seat (10).

5. A dual-station driven internal and external cylindrical composite grinding machine according to claim 4, characterized in that, The actuating mechanism includes a push block (34), which is fixedly connected to the rotating shaft of the clamping block (32). The top of the clamping block (5) is slidably connected to a push plate (35). The end of the push plate (35) passes through the drive disk (4) and is slidably connected to a sliding plate (36). The top of the sliding plate (36) is slidably connected to a sliding seat (10).

6. A dual-station driven internal and external cylindrical composite grinding machine according to claim 5, characterized in that, It also includes a folded connecting shell (23), one end of which passes through the annular shell (3) and is fixedly connected to the annular shell (3). The top end of the connecting rod (25) is sealed and slidably connected inside the folded connecting shell (23). A piston (24) is sealed and slidably connected inside the bottom end of the folded connecting shell (23). The rod of the piston (24) is fixedly connected to the side wall of the sliding seat (10).

7. A dual-station driven internal and external cylindrical composite grinding machine according to claim 3, characterized in that, The guide groove (11) includes a first arc groove (1101) and a second arc groove (1102). The radius of the first arc groove (1101) is smaller than that of the second arc groove (1102). The second arc groove (1102) and the first arc groove (1101) are connected by a guide groove (1103).

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