Automatic turnover device for numerical control machining clamp

Abstract

The invention discloses an automatic turnover device for a numerical control machining clamp, and relates to the technical field of numerical control machining, the automatic turnover device comprises a mounting table, a bearing plate is rotatably mounted on the mounting table, a rotating shaft is rotatably mounted on the bearing plate, the included angle formed by the extending direction of the rotating shaft and the rotating direction of the bearing plate is 90 degrees, and the rotating shaft is rotatably mounted on the mounting table; a connecting disc is mounted at the front end of the rotating shaft, and a clamp is arranged on the connecting disc; wherein the bearing plate is provided with a shaft hole for the rotating shaft to penetrate through, the rotating shaft is provided with a plurality of gas flow channels extending along the axis of the rotating shaft, and each gas flow channel is provided with a gas inlet end and a gas outlet end. Through cooperative work of the gas flow channel, the sealing ring, various adjusting components, the transmission assembly, the protection structure and the like, abrasion of the rotating shaft and the shaft seat is reduced, the machining cost is reduced, the service life of the components is prolonged, and the stability and reliability of the device are improved.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control machining, in particular to an automatic turning device for a numerical control machining fixture. Background Art

[0002] In the field of modern CNC machining, in order to achieve multi-faceted machining of workpieces and improve machining accuracy and efficiency, automatic flipping devices have been widely used in CNC machining fixtures. The device can achieve accurate flipping of the workpiece through the continuous rotation of the rotating axis when the fixture is clamping the workpiece, so that different faces of the workpiece are in the appropriate machining position in turn, thereby reducing the number of clamping times of the workpiece during the machining process and effectively improving the machining quality and production efficiency.

[0003] However, the existing automatic flipping devices for CNC machining fixtures have some problems that need to be solved during actual operation. Among them, the contact point between the rotating shaft and the shaft seat is facing great pressure due to the weight of the workpiece. With the continuous rotation of the rotating shaft, this pressure continues to increase, which in turn leads to a significant increase in the friction force at the contact point. The increase in friction force not only aggravates the sliding wear of the contact point, reduces the service life of the rotating shaft and the shaft seat, and increases production costs due to frequent replacement of parts, but also has a negative impact on the transmission system of the entire device.

[0004] On the one hand, the increased friction forces require the transmission device to bear a greater load, which may not only increase the probability of failure of the transmission device and shorten its service life, but also require the transmission device to consume more energy in order to overcome the increased friction forces, thereby increasing the energy consumption of the entire device and increasing the processing cost. On the other hand, the change in the gap between the rotating shaft and the shaft seat due to sliding wear may affect the flipping accuracy of the workpiece, thereby adversely affecting the final processing quality of the workpiece. Summary of the invention

[0005] The object of the present invention is to provide an automatic turning device for a numerical control machining fixture to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides an automatic flipping device for a CNC machining fixture, comprising:

[0007] A mounting table, on which a carrying plate is rotatably mounted, a rotating shaft is rotatably mounted on the carrying plate, an angle formed between the extending direction of the rotating shaft and the rotating direction of the carrying plate is 90°, a connecting disk is mounted at the front end of the rotating shaft, and a clamp is arranged on the connecting disk;

[0008] Among them, the supporting plate is provided with an axial hole for the rotating shaft to pass through, and the rotating shaft is provided with a plurality of gas flow channels extending along its axis. The gas flow channels have an air inlet end and an air outlet end, and the air inlet end is connected to a gas supply component, and the air outlet end extends radially along the rotating shaft, and its end faces the inner wall of the axial hole of the supporting plate.

[0009] Furthermore, the air supply component includes a gas compressor arranged on the rear side of the supporting plate and a sealing ring which is sealingly rotatably sleeved on the outer wall of the rotating shaft, the outer surface of the sealing ring is provided with an air inlet, the output end of the gas compressor is connected to the air inlet through a pipeline, the interior of the sealing ring is provided with an annular cavity, and a plurality of air outlets are provided on the bottom wall of the sealing ring, and the annular cavity is connected to the gas flow channel through the air outlet.

[0010] Furthermore, a partition extending along the length direction is installed inside the gas flow channel, and the inner cavity of the gas flow channel is divided into a left boost chamber and a right boost chamber by the partition. A blowing port that can alternately communicate with the left boost chamber and the right boost chamber is opened on the rotating shaft, and the blowing port is set in the same way as the air outlet end.

[0011] Furthermore, a valve slot connecting the gas flow channel and the blowing port is provided inside the rotating shaft, and a left valve plate and a right valve plate are symmetrically mounted inside the valve slot for rotation. When the left valve plate and the right valve plate are closed, the blowing port is blocked. Valve holes are provided on the left valve plate and the right valve plate, and a limit rod is inserted into the inside of the valve hole, and the limit rod is fixed to the inner wall of the valve slot.

[0012] Furthermore, a movable groove corresponding to the blowing port is provided on the outer wall of the rotating shaft, and a sealing mechanism is provided inside the movable groove. The sealing mechanism includes a movable plate arranged inside the movable groove and slidable along the axial direction of the rotating shaft, and a conducting hole corresponding to the blowing port is provided on the movable plate. An adjusting component is also provided inside the movable groove for adjusting the movable plate to slide inside the movable groove to adjust the conducting hole to block the blowing port.

[0013] Furthermore, the adjusting component includes a first connecting rod rotatably connected to the rear side of the movable plate, the first connecting rod is rotatably connected to the second connecting rod at one end away from the movable plate, the second connecting rod is rotatably connected to the inner wall of the movable groove, and a third connecting rod is rotatably arranged at the connection between the first connecting rod and the second connecting rod, the third connecting rod is perpendicular to the first connecting rod and the second connecting rod, and a limiting ring is also arranged on the inner wall of the supporting plate, and the top end of the third connecting rod is abutted against the inner wall of the limiting ring.

[0014] Furthermore, a protective frame is installed on the back of the supporting plate, a servo motor is installed on the protective frame, a coupling is connected to the rear end of the rotating shaft, and the driving end of the servo motor is connected to the rotating shaft through the coupling; a supporting seat is installed on the front end and the rear end surface of the supporting plate, and the rotating shaft is rotatably connected to the inside of the supporting seat.

[0015] Further, the mounting platform includes a lower bracket, a left bracket arranged on the left side of the lower bracket, and a right bracket arranged on the right side of the lower bracket;

[0016] Among them, bearing seats are provided on both the left bracket and the right bracket, a first short shaft is rotatably mounted on the bearing seat on the right bracket, and a second short shaft is rotatably mounted on the bearing seat on the left bracket, and the bearing plate is arranged between the bearing seat and the second short shaft, one side of which is connected to the first short shaft, and the other side is connected to the second short shaft.

[0017] Furthermore, a driving assembly for driving the supporting plate to rotate is also provided on the left bracket; the driving assembly includes a driving motor installed on the inner wall of the left bracket, and synchronous wheels are installed on the driving end of the driving motor and the end of the second short shaft away from the supporting plate, and a synchronous belt is connected between the two synchronous wheels.

[0018] Furthermore, a protective cover is installed on the side wall of the second short shaft, and the protective cover is arranged on the outside of the synchronous wheel and the synchronous belt; wherein, an indicator needle is fixedly installed on the outer wall of the first short shaft, and scale lines are arranged on the outer end surface of the bearing seat, and the interruption of the indicator needle is indicated on the scale lines.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention forms an air film at the contact portion between the rotating shaft and the bearing plate, thereby significantly reducing friction and direct contact, reducing sliding wear between the rotating shaft and the inner wall of the shaft hole of the bearing plate, extending the service life of the rotating shaft, the bearing plate and related components such as the bearing seat, and reducing the cost caused by frequent replacement of components. The reduced friction reduces the load borne by the transmission device, reduces the probability of failure of the transmission device, extends its service life, and at the same time reduces the energy consumption of the device and saves processing costs.

[0021] 2. The present invention specially designs the rotating shaft and sets a gas channel inside the rotating shaft. The gas channel extends from one end of the rotating shaft to a position close to the inner wall of the shaft hole of the supporting plate. A series of tiny blowing ports are opened on the surface in contact with the rotating shaft. These blowing ports are evenly distributed along the circumferential direction to ensure that the ejected gas can evenly act on the contact surface between the shaft hole and the rotating shaft. The gas is ejected through the tiny blowing ports on the surface of the rotating shaft to form a layer of air film on the inner wall of the rotating shaft and the shaft hole. This layer of air film can effectively reduce the direct contact area between the rotating shaft and the shaft seat, thereby reducing the friction between the two. At the same time, the upward lift generated by the ejected gas can offset part of the pressure applied to the contact portion of the rotating shaft and the shaft seat due to the weight of the workpiece, thereby further reducing the load on the contact portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view structural schematic diagram of the present invention;

[0023] Figure 2 It is a rear view structural schematic diagram of the present invention;

[0024] Figure 3 It is a schematic diagram of the explosion structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the connection structure between the clamp and the rotating shaft in the present invention;

[0026] Figure 5 for Figure 4 A schematic diagram of the structure in the normal direction;

[0027] Figure 6 For along Figure 5 Structural diagram of the middle section line AA;

[0028] Figure 7 It is a schematic diagram of the connection structure between the rotating shaft and the connecting disk in the present invention;

[0029] Figure 8 It is a schematic diagram of the vertical cross-section structure of the rotating shaft in the present invention;

[0030] Fig. 9 It is a schematic diagram of the transverse cross-sectional structure of the rotating shaft in the present invention;

[0031] Fig.10 It is a structural schematic diagram of the blocking mechanism in the present invention.

[0032] In the figure:

[0033] 1. Mounting table; 101. Lower bracket; 102. Left bracket; 103. Right bracket; 104. Bearing seat; 105. First short shaft; 106. Second short shaft; 2. Indicator needle; 3. Drive assembly; 31. Drive motor; 32. Synchronous wheel; 33. Synchronous belt; 4. Protective cover; 5. Connecting plate; 6. Clamp; 7. Rotating shaft; 8. Coupling; 9. Servo motor; 10. Protective frame; 11. Gas compressor; 12. Loading plate; 1 3. Bearing seat; 14. Sealing ring; 15. Annular cavity; 16. Air inlet; 17. Movable groove; 18. Sealing mechanism; 181. Movable plate; 182. Conducting hole; 183. First connecting rod; 184. Second connecting rod; 185. Third connecting rod; 19. Gas flow channel; 20. Air outlet; 21. Blowing port; 22. Partition; 23. Valve groove; 24. Left valve plate; 25. Limit rod; 26. Valve hole; 27. Right valve plate; 28. Limit ring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 10 The present invention provides a technical solution: an automatic flipping device for a CNC machining fixture, comprising:

[0036] A mounting platform 1, on which a carrying plate 12 is rotatably mounted, on which a rotating shaft 7 is rotatably mounted, the extending direction of the rotating shaft 7 and the rotating direction of the carrying plate 12 form an angle of 90°, a connecting plate 5 is mounted at the front end of the rotating shaft 7, and a clamp 6 is arranged on the connecting plate 5;

[0037] Among them, an axial hole is opened on the supporting plate 12 for the rotating shaft 7 to pass through, and a plurality of gas flow channels 19 extending along its axis are opened on the rotating shaft 7. The gas flow channels 19 have an air inlet end and an air outlet end. The air inlet end is connected to a gas supply component, and the air outlet end extends radially along the rotating shaft 7, and its end faces the inner wall of the axial hole of the supporting plate 12.

[0038] Specifically, the mounting table 1 serves as a basic supporting structure, and the supporting plate 12 can rotate thereon to provide a rotating platform for the rotating shaft 7 and the clamp 6. The rotating shaft 7 is rotatably mounted on the supporting plate 12, and its extension direction is at an angle of 90° to the rotation direction of the supporting plate 12. This layout enables the clamp 6 to achieve a specific angle of flipping. The front end of the rotating shaft 7 is connected to the connecting plate 5, which is used to install the clamp 6 to clamp the workpiece. The axial hole on the supporting plate 12 is for the rotating shaft 7 to pass through. The air inlet end of the gas flow channel 19 on the rotating shaft 7 is connected to the air supply component, and the air outlet end faces the inner wall of the axial hole of the supporting plate 12. The gas provided by the air supply component is ejected from the air outlet end of the gas flow channel 19 to form an air film between the rotating shaft 7 and the inner wall of the axial hole of the supporting plate 12; the air film is formed by ejecting gas through the gas flow channel 19, which can reduce the friction and direct contact between the rotating shaft 7 and the inner wall of the axial hole of the supporting plate 12, reduce wear, and increase the service life of the rotating shaft 7 and the supporting plate 12. At the same time, the load on the transmission device is reduced, and the overall performance and processing accuracy of the device are improved.

[0039] See also Figure 2 , Figure 4 , Figure 6 , Figure 7 and Figure 8 The gas supply component includes a gas compressor 11 arranged on the rear side of the supporting plate 12 and a sealing ring 14 which is sealed and rotatably sleeved on the outer wall of the rotating shaft 7. The outer surface of the sealing ring 14 is provided with an air inlet 16. The output end of the gas compressor 11 is connected to the air inlet 16 through a pipeline. An annular cavity 15 is provided inside the sealing ring 14. A plurality of air outlets 20 are provided on the bottom wall of the sealing ring 14. The annular cavity 15 is communicated with the gas flow channel 19 through the air outlet 20.

[0040] Specifically, the gas compressor 11 compresses the gas and transports it to the air inlet 16 on the outer surface of the sealing ring 14 through a pipeline. The gas enters the annular cavity 15 inside the sealing ring 14, and then enters the gas flow channel 19 of the rotating shaft 7 through multiple air outlets 20 on the bottom wall of the annular cavity 15, and is finally ejected from the air outlet end of the gas flow channel 19. The sealing ring 14 is sealed and rotatably sleeved on the outer wall of the rotating shaft 7 to ensure the sealing of the gas transportation process without affecting the rotation of the rotating shaft 7. The arrangement of this gas supply component ensures a stable gas supply, provides a guarantee for the formation of a stable gas film at the contact point between the rotating shaft 7 and the supporting plate 12, and further enhances the effect of reducing friction, reducing wear, and improving the stability and reliability of the device.

[0041] See also Figure 6 , Figure 7 , Figure 8 , Fig. 9A partition 22 extending along the length direction is installed inside the gas flow channel 19. The inner cavity of the gas flow channel 19 is divided into a left boost chamber and a right boost chamber by the partition 22. A blowing port 21 that can alternately communicate with the left boost chamber and the right boost chamber is opened on the rotating shaft 7. The blowing port 21 is set in the same way as the gas outlet end.

[0042] Specifically, the partition 22 in the gas flow channel 19 divides its inner cavity into a left boost chamber and a right boost chamber, and the blowing port 21 on the rotating shaft 7 can be alternately connected with the left boost chamber and the right boost chamber. After the gas enters the gas flow channel 19, it flows in the left and right boost chambers. According to the rotation position of the rotating shaft 7, the blowing port 21 is alternately connected with different boost chambers, so that the gas is ejected from the blowing port 21, and the blowing port 21 is set in the same way as the gas outlet end, and also sprays toward the inner wall of the shaft hole of the carrier plate 12; through the alternating connection between the left and right boost chambers and the blowing port 21, the position and intensity of the jet can be adjusted, and an air film can be more flexibly formed at the contact part between the rotating shaft 7 and the carrier plate 12, further optimizing the air film effect, better reducing friction and wear, and improving the rotation stability of the rotating shaft 7 and the overall performance of the device.

[0043] See also Figure 7 , Figure 8 and Fig. 9 A valve slot 23 for connecting the gas flow channel 19 and the blowing port 21 is provided inside the rotating shaft 7, and a left valve plate 24 and a right valve plate 27 are symmetrically mounted inside the valve slot 23 for rotation. When the left valve plate 24 and the right valve plate 27 are closed, the blowing port 21 is blocked. Valve holes 26 are provided on the left valve plate 24 and the right valve plate 27, and a limiting rod 25 is inserted inside the valve hole 26, and the limiting rod 25 is fixed to the inner wall of the valve slot 23.

[0044] Specifically, in the valve slot 23 inside the rotating shaft 7, the left valve plate 24 and the right valve plate 27 are symmetrically rotated and installed. When the left valve plate 24 and the right valve plate 27 are closed, the blowing port 21 is blocked. The valve holes 26 on the left valve plate 24 and the right valve plate 27 are plugged with the limit rod 25, and the limit rod 25 is fixed to the inner wall of the valve slot 23 to limit the rotation range of the left valve plate 24 and the right valve plate 27. When the gas pressure acts on the left valve plate 24 or the right valve plate 27, it rotates around the limit rod 25, thereby opening the blowing port 21 and realizing the gas ejection from the blowing port 21; this valve plate structure can accurately control the opening and closing of the blowing port 21, accurately control the gas ejection according to the gas pressure and the pressure change inside the rotating shaft 7, further optimize the gas film formation effect, improve the protection of the contact part between the rotating shaft 7 and the carrier plate 12, and improve the reliability and stability of the device.

[0045] See Figure Figure 6 , Figure 7 , Figure 8 and Fig.10A movable groove 17 corresponding to the blowing port 21 is provided on the outer wall of the rotating shaft 7, and a blocking mechanism 18 is provided inside the movable groove 17. The blocking mechanism 18 includes a movable plate 181 which is arranged inside the movable groove 17 and can slide along the axial direction of the rotating shaft 7. A conducting hole 182 corresponding to the blowing port 21 is provided on the movable plate 181. An adjusting component for adjusting the movable plate 181 to slide inside the movable groove 17 to adjust the conducting hole 182 to block the blowing port 21 is also provided inside the movable groove 17; the adjusting component includes a rotating A first connecting rod 183 is connected to the rear side of the movable plate 181, and the end of the first connecting rod 183 away from the movable plate 181 is rotatably connected to the second connecting rod 184, and the second connecting rod 184 is rotatably connected to the inner wall of the movable groove 17. A third connecting rod 185 is also rotatably arranged at the connection between the first connecting rod 183 and the second connecting rod 184, and the third connecting rod 185 is perpendicular to the first connecting rod 183 and the second connecting rod 184. A limiting ring 28 is also arranged on the inner wall of the supporting plate 12, and the top end of the third connecting rod 185 is against the inner wall of the limiting ring 28.

[0046] Specifically, a blocking mechanism 18 is provided in the movable groove 17 on the outer wall of the rotating shaft 7, and a movable plate 181 can slide in the movable groove 17 along the axial direction of the rotating shaft 7, and the conducting hole 182 on the movable plate 181 corresponds to the blowing port 21. The adjusting component can adjust the sliding of the movable plate 181 in the movable groove 17, thereby changing the blocking degree of the conducting hole 182 on the blowing port 21, and controlling the flow rate and pressure of the gas ejected from the blowing port 21; the flow rate and pressure of the gas ejected from the blowing port 21 can be flexibly adjusted by the blocking mechanism 18, and the strength and stability of the air film can be accurately adjusted according to the actual working conditions, such as the weight of the workpiece, the rotation speed of the rotating shaft 7, etc., so as to further improve the adaptability of the device to different working conditions and optimize the performance of the device;

[0047] When the rotating shaft 7 rotates, the third connecting rod 185, under the action of the inner wall of the limiting ring 28, pushes the first connecting rod 183 and the second connecting rod 184 to move, thereby driving the movable plate 181 to slide in the movable groove 17, and adjusting the blocking of the conduction hole 182 to the blowing port 21; the mechanical movement of the rotating shaft 7 during rotation is used to realize automatic adjustment of the blowing port 21, without the need for an additional power source, with a simple structure and precise adjustment, which further enhances the degree of automation and stability of the device and optimizes the air film adjustment effect.

[0048] See also Figure 4 A protective frame 10 is installed on the back of the supporting plate 12, a servo motor 9 is installed on the protective frame 10, a coupling 8 is connected to the rear end of the rotating shaft 7, and the driving end of the servo motor 9 is connected to the rotating shaft 7 through the coupling 8; a supporting seat 13 is installed on the front end and the rear end of the supporting plate 12, and the rotating shaft 7 is rotatably connected to the inside of the supporting seat 13.

[0049] Specifically, the protective frame 10 is installed on the back of the bearing plate 12 to protect the servo motor 9. The servo motor 9 is connected to the rear end of the rotating shaft 7 through the coupling 8 to provide rotational power for the rotating shaft 7. The bearing seats 13 on the front and rear ends of the bearing plate 12 provide stable support for the rotating shaft 7 to ensure the smooth rotation of the rotating shaft 7; the protective frame 10 protects the servo motor 9 and prolongs its service life; the bearing seat 13 ensures the stable rotation of the rotating shaft 7, improves the overall stability and reliability of the device, and provides a guarantee for the precise flipping of the workpiece.

[0050] See also Figure 3 The mounting platform 1 includes a lower bracket 101, a left bracket 102 disposed on the left side of the lower bracket 101, and a right bracket 103 disposed on the right side of the lower bracket 101;

[0051] Among them, bearing seats 104 are provided on both the left bracket 102 and the right bracket 103. A first short shaft 105 is rotatably installed on the bearing seat 104 on the right bracket 103, and a second short shaft 106 is rotatably installed on the bearing seat 104 on the left bracket 102. The bearing plate 12 is arranged between the bearing seat 104 and the second short shaft 106, one side of which is connected to the first short shaft 105, and the other side is connected to the second short shaft 106.

[0052] Specifically, the mounting platform 1 is composed of a lower bracket 101, a left bracket 102 and a right bracket 103. The bearing seats 104 on the left bracket 102 and the right bracket 103 are respectively rotatably installed with the first short shaft 105 and the second short shaft 106. The two sides of the supporting plate 12 are respectively connected to the first short shaft 105 and the second short shaft 106, so that the supporting plate 12 can rotate around the axis under the support of the bearing seat 104; this mounting platform 1 structure provides stable support for the rotation of the supporting plate 12, ensures the stability and accuracy of the rotation of the supporting plate 12, and further ensures the stability and accuracy of the flipping of the fixture 6 and the workpiece.

[0053] See also Figure 3 The left bracket 102 is also provided with a driving assembly 3 for driving the carrier plate 12 to rotate; the driving assembly 3 includes a driving motor 31 installed on the inner wall of the left bracket 102, and a synchronous wheel 32 is installed on the driving end of the driving motor 31 and the end of the second short shaft 106 away from the carrier plate 12, and a synchronous belt 33 is connected between the two synchronous wheels 32;

[0054] Specifically, the driving motor 31 in the driving component 3 is installed on the inner wall of the left bracket 102, and a synchronous wheel 32 is installed at the driving end and the end of the second short shaft 106 away from the supporting plate 12. The two synchronous wheels 32 are connected by a synchronous belt 33. When the driving motor 31 is running, the second short shaft 106 is driven to rotate through the synchronous wheel 32 and the synchronous belt 33, and then the supporting plate 12 is driven to rotate; the driving component 3 provides stable rotational power for the supporting plate 12, and the transmission method of the synchronous wheel 32 and the synchronous belt 33 ensures the accuracy and stability of the transmission, improves the accuracy and reliability of the rotation of the supporting plate 12, and ensures the accuracy of the flipping of the workpiece.

[0055] See also Figure 3 A protective cover 4 is installed on the side wall of the second short shaft 106, and the protective cover 4 is arranged on the outside of the synchronous wheel 32 and the synchronous belt 33; wherein, an indicator needle 2 is fixedly installed on the outer wall of the first short shaft 105, and a scale line is arranged on the outer end surface of the bearing seat 104, and the interruption of the indicator needle 2 is indicated on the scale line.

[0056] Specifically, the protective cover 4 on the side wall of the second short shaft 106 covers the synchronous wheel 32 and the synchronous belt 33 to play a protective role. The indicator needle 2 on the outer wall of the first short shaft 105 cooperates with the scale line on the outer end surface of the bearing seat 104 to indicate the rotation angle of the carrier plate 12; the protective cover 4 protects the synchronous wheel 32 and the synchronous belt 33 and extends their service life; the indicator needle 2 and the scale line make it convenient for the operator to accurately understand the rotation angle of the carrier plate 12, which is convenient for accurately controlling the flipping angle of the workpiece and improving the processing accuracy.

[0057] Working principle: The automatic flipping device is based on the mounting platform 1, which is composed of a lower bracket 101, a left bracket 102 and a right bracket 103. The bearing seats 104 on the left bracket 102 and the right bracket 103 are respectively rotatably mounted with a first short shaft 105 and a second short shaft 106. Both sides of the bearing plate 12 are connected to the two short shafts to realize the rotation of the bearing plate 12 on the mounting platform 1.

[0058] Rotation drive of the bearing plate 12: The driving assembly 3 on the left bracket 102 provides power for the rotation of the bearing plate 12. The driving motor 31 is installed on the inner wall of the left bracket 102. The driving end thereof and the second short shaft 106 are respectively installed with synchronous wheels 32. The driving motor 31 is driven by a synchronous belt 33 to rotate the second short shaft 106, thereby rotating the bearing plate 12. The indicator needle 2 on the first short shaft 105 cooperates with the scale line on the outer end surface of the bearing seat 104 to indicate the rotation angle of the bearing plate 12.

[0059] Rotating shaft 7 and clamp 6: The rotating shaft 7 is rotatably installed on the supporting plate 12, and its extension direction is at an angle of 90° to the rotation direction of the supporting plate 12. The front end of the rotating shaft 7 is connected to the connecting disk 5, and the clamp 6 is arranged on the connecting disk 5 for clamping the workpiece. The servo motor 9 is installed in the protective frame 10 on the back of the supporting plate 12, which is connected to the rear end of the rotating shaft 7 through the coupling 8 to provide rotational power for the rotating shaft 7. The bearing seats 13 on the front and rear end surfaces of the supporting plate 12 support the rotating shaft 7.

[0060] Gas supply friction reduction: The gas supply component includes a gas compressor 11 and a sealing ring 14. The gas compressor 11 transports the gas to the air inlet 16 on the outer surface of the sealing ring 14 through a pipeline. The gas enters the annular cavity 15 inside the sealing ring 14, and then enters the gas flow channel 19 extending along the axis of the rotating shaft 7 through the air outlet 20; a partition 22 is provided in the gas flow channel 19 to divide the inner cavity into a left boost chamber and a right boost chamber, and the blowing port 21 on the rotating shaft 7 can be alternately connected to the two boost chambers. The left valve plate 24 and the right valve plate 27 in the valve slot 23 control the opening and closing of the blowing port 21 to achieve the effect of boosting and ejecting. Finally, the gas is ejected from the outlet end of the gas flow channel 19 and the blowing port 21, forming an air film between the rotating shaft 7 and the inner wall of the shaft hole of the bearing plate 12;

[0061] Generation of lift: When the automatic flipping device of the CNC machining fixture starts working, the rotating shaft 7 starts to rotate. At the same time, the gas supply component transports gas with a certain pressure to the gas flow channel 19 inside the rotating shaft 7. The gas is ejected through the blowing port 21 on the surface of the rotating shaft 7, and a layer of air film is formed at the contact point between the rotating shaft 7 and the axial hole. This layer of air film can effectively reduce the direct contact area between the rotating shaft 7 and the axial hole, thereby reducing the friction between the two. At the same time, the upward lift generated by the ejected gas can offset part of the pressure applied to the contact point between the rotating shaft 7 and the axial hole due to the weight of the workpiece, thereby further reducing the load on the contact point.

[0062] Reduce wear: Through the isolation effect of the air film and the offset of lift to pressure, the sliding wear of the contact part between the rotating shaft 7 and the shaft hole is significantly reduced, the service life of the rotating shaft 7 and the shaft hole is extended, and the cost caused by frequent replacement of parts is reduced.

[0063] Reduce the load on the transmission device: Due to the reduction of friction and pressure, the load on the transmission device is also reduced accordingly, reducing the probability of transmission device failure, extending its service life, and reducing the energy consumption of the entire device.

[0064] Guaranteeing machining accuracy: Stable air film support and smaller friction force can make the rotating shaft 7 rotate more smoothly, reduce the change of the gap between the rotating shaft 7 and the shaft hole caused by wear and pressure change, thereby ensuring the turning accuracy of the workpiece and improving the final machining quality of the workpiece.

[0065] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. An automatic turning device for a CNC machining fixture, characterized in that: include: A mounting platform (1) on which a carrying plate (12) is rotatably mounted, a rotating shaft (7) is rotatably mounted on the carrying plate (12), an angle formed between an extension direction of the rotating shaft (7) and a rotation direction of the carrying plate (12) being 90°, a connecting plate (5) being mounted at the front end of the rotating shaft (7), and a clamp (6) being arranged on the connecting plate (5); The carrier plate (12) is provided with an axial hole for the rotating shaft (7) to pass through, and the rotating shaft (7) is provided with a plurality of gas flow channels (19) extending along its axis. The gas flow channels (19) have an air inlet end and an air outlet end, wherein the air inlet end is connected to a gas supply component, and the air outlet end extends radially along the rotating shaft (7), and its end faces the inner wall of the axial hole of the carrier plate (12).

2. The automatic turning device for a CNC machining fixture according to claim 1, characterized in that: The gas supply component comprises a gas compressor (11) arranged on the rear side of a carrier plate (12) and a sealing ring (14) sleeved on the outer wall of a rotating shaft (7) in a sealing and rotatable manner, an air inlet (16) is provided on the outer surface of the sealing ring (14), an output end of the gas compressor (11) is connected to the air inlet (16) through a pipeline, an annular cavity (15) is provided inside the sealing ring (14), a plurality of air outlets (20) are provided on the bottom wall of the sealing ring (14), and the annular cavity (15) is communicated with a gas flow channel (19) through the air outlet (20).

3. The automatic turning device for a CNC machining fixture according to claim 1, characterized in that: The gas flow channel (19) is provided with a partition (22) extending along its length direction, and the inner cavity of the gas flow channel (19) is divided into a left boost chamber and a right boost chamber by the partition (22). A blowing port (21) capable of alternately communicating with the left boost chamber and the right boost chamber is provided on the rotating shaft (7), and the blowing port (21) is arranged in the same manner as the gas outlet end.

4. The automatic turning device for a CNC machining fixture according to claim 3, characterized in that: The rotating shaft (7) is provided with a valve groove (23) for connecting the gas flow channel (19) and the blowing port (21). A left valve plate (24) and a right valve plate (27) are symmetrically mounted inside the valve groove (23) for rotation. When the left valve plate (24) and the right valve plate (27) are closed, the blowing port (21) is blocked. A valve hole (26) is provided on the left valve plate (24) and the right valve plate (27). A limiting rod (25) is inserted into the inside of the valve hole (26). The limiting rod (25) is fixed to the inner wall of the valve groove (23).

5. The automatic turning device for a CNC machining fixture according to claim 3, characterized in that: A movable groove (17) corresponding to the blowing port (21) is provided on the outer wall of the rotating shaft (7); a blocking mechanism (18) is provided inside the movable groove (17); the blocking mechanism (18) comprises a movable plate (181) provided inside the movable groove (17) and slidable along the axial direction of the rotating shaft (7); a conducting hole (182) corresponding to the blowing port (21) is provided on the movable plate (181); and an adjusting component is also provided inside the movable groove (17) for adjusting the movable plate (181) to slide inside the movable groove (17) so as to adjust the conducting hole (182) to block the blowing port (21).

6. The automatic turning device for a CNC machining fixture according to claim 5, characterized in that: The adjusting component comprises a first connecting rod (183) rotatably connected to the rear side of the movable plate (181); an end of the first connecting rod (183) away from the movable plate (181) is rotatably connected to a second connecting rod (184); the second connecting rod (184) is rotatably connected to the inner wall of the movable groove (17); a third connecting rod (185) is rotatably arranged at the connection between the first connecting rod (183) and the second connecting rod (184); the third connecting rod (185) is perpendicular to the first connecting rod (183) and the second connecting rod (184); a limiting ring (28) is also arranged on the inner wall of the supporting plate (12); the top end of the third connecting rod (185) abuts against the inner wall of the limiting ring (28).

7. The automatic turning device for a CNC machining fixture according to claim 1, characterized in that: A protective frame (10) is installed on the back of the carrier plate (12), a servo motor (9) is installed on the protective frame (10), a coupling (8) is connected to the rear end of the rotating shaft (7), and the driving end of the servo motor (9) is connected to the rotating shaft (7) through the coupling (8); a bearing seat (13) is installed on the front end face and the rear end face of the carrier plate (12), and the rotating shaft (7) is rotatably connected inside the bearing seat (13).

8. The automatic turning device for a CNC machining fixture according to claim 1, characterized in that: The mounting platform (1) comprises a lower bracket (101), a left bracket (102) arranged on the left side of the lower bracket (101), and a right bracket (103) arranged on the right side of the lower bracket (101); Wherein, the left bracket (102) and the right bracket (103) are both provided with a bearing seat (104); a first short shaft (105) is rotatably mounted on the bearing seat (104) on the right bracket (103); a second short shaft (106) is rotatably mounted on the bearing seat (104) on the left bracket (102); the bearing plate (12) is arranged between the bearing seat (104) and the second short shaft (106); one side of the bearing plate is connected to the first short shaft (105), and the other side is connected to the second short shaft (106).

9. The automatic turning device for a CNC machining fixture according to claim 8, characterized in that: The left bracket (102) is also provided with a driving assembly (3) for driving the bearing plate (12) to rotate; the driving assembly (3) comprises a driving motor (31) mounted on the inner wall of the left bracket (102), a synchronous wheel (32) is mounted on the driving end of the driving motor (31) and the end of the second short shaft (106) away from the bearing plate (12), and a synchronous belt (33) is connected between the two synchronous wheels (32).

10. The automatic turning device for a CNC machining fixture according to claim 9, characterized in that: A protective cover (4) is installed on the side wall of the second short shaft (106), and the protective cover (4) is arranged outside the synchronous wheel (32) and the synchronous belt (33); wherein an indicator needle (2) is fixedly installed on the outer wall of the first short shaft (105), and a scale line is arranged on the outer end surface of the bearing seat (104), and the interruption of the indicator needle (2) is indicated on the scale line.

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