High-speed rotating main shaft with shaft-diameter bidirectional floating function

Abstract

The utility model relates to the technical field of motorized spindles, in particular to a high-speed rotating spindle with a shaft-diameter bidirectional floating function, which comprises a spindle assembly, a radial floating mechanism is connected outside the spindle assembly to form a structure that the spindle assembly can relatively float and deflect along the radial direction through the radial floating mechanism. The radial floating mechanism extends to form a connecting seat, the connecting seat is connected with an axial floating mechanism to form a structure capable of realizing relative floating movement of the main shaft assembly along the axial direction through the axial floating mechanism, and an upper protective flange and a lower protective flange are respectively fixed at two ends of the radial floating mechanism. According to the electric spindle, floating of the electric spindle is achieved, the situation that the electric spindle is damaged due to the fact that the electric spindle bears too large rigid force in the rotating process is avoided, and the electric spindle has wide application prospects in the technical field of electric spindles.

Description

Technical Field

[0001] The utility model relates to the technical field of electric spindles, in particular to a high-speed rotating spindle with bidirectional floating shaft diameter. Background Art

[0002] In the prior art, after the metal workpiece is integrally die-cast, there will always be burrs on the edge, i.e., at the mold closing point, and even residual risers, which need to be polished using a polishing tool connected to an electric spindle. In order to improve work efficiency and ensure safety, an industrial robot connected to a polishing tool is usually used to cut and polish the burrs of the workpiece. However, in the prior art, the robot is usually directly and rigidly connected to the electric spindle. During the polishing process, the electric spindle has no floating function, or has only a single radial or axial floating function. During the polishing process, the rigidity between the electric spindle and the polishing head and the workpiece is too large, which can easily cause damage to the electric spindle or the polishing head. The electric spindle or the polishing head needs to be replaced frequently, which affects the subsequent polishing efficiency. Therefore, a floating spindle that solves the above problems is needed. Utility Model Content

[0003] In order to solve the problem in the prior art that in the prior art, the robot is directly rigidly connected to the electric spindle, during the grinding process, the electric spindle has no floating, or has only a single radial or axial floating, and during the grinding process, the rigidity between the electric spindle and the grinding head and the workpiece is too large, which can easily cause damage to the electric spindle or the grinding head, and the electric spindle or the grinding head needs to be replaced frequently, affecting the subsequent grinding efficiency, a high-speed rotating spindle with bidirectional floating of the shaft diameter is invented.

[0004] The technical solution of the utility model is that it includes a main shaft assembly, wherein the main shaft assembly is externally connected with a radial floating mechanism, constituting a structure that enables the main shaft assembly to float and deflect relatively in the radial direction through the radial floating mechanism, the radial floating mechanism is extended with a connecting seat, and the connecting seat is connected with an axial floating mechanism, constituting a structure that enables the main shaft assembly to float and move relatively in the axial direction through the axial floating mechanism, and upper protective flanges and lower protective flanges are respectively fixed at both ends of the radial floating mechanism, and upper protective rubbers and lower protective rubbers are respectively clamped and fixed on the upper protective flange and the lower protective flange.

[0005] Preferably, the main shaft is composed of a driving motor assembly and a rotor assembly, and the radial floating mechanism includes a limiting ring, a floating ring, a floating outer ring, a cylinder housing and a cylinder cover plate, the limiting ring is connected to the main shaft assembly, the floating ring is connected to the limiting ring, the floating outer ring is sleeved outside the floating ring, the outer end face of the floating ring is provided with a plurality of floating heads, the inner end face of the floating outer ring is provided with a plurality of floating grooves, the floating head is slidably connected in the floating groove, and the outer end face of the limiting ring is extended with a limiting protrusion for limiting the floating outer ring.

[0006] Preferably, the cylinder housing is connected to the end of the floating outer ring away from the limiting protrusion, and a plurality of interconnected first cylinders are provided in the cylinder housing. A piston is slidably arranged in the first cylinder, and a floating rod with one end extending outside the first cylinder is connected to the piston. A wear-resistant ring is connected to the end of the cylinder housing close to the floating ring, and the floating rod penetrates the wear-resistant ring and contacts the floating ring. A cylinder cover plate is connected to the cylinder housing, and an air supply hole connected to the cylinder is provided on the cylinder cover plate.

[0007] Preferably, an air delivery ring groove connected to a plurality of first cylinders is formed at one end of the cylinder housing away from the floating outer ring, and the air delivery hole is connected to the air delivery ring groove.

[0008] Preferably, the axial floating mechanism includes a base, a cylinder body, a guide rail and a sliding block, the cylinder body and the guide rail are connected to the base, the sliding block is connected to the connecting seat and is slidably connected to the guide rail, a second cylinder is opened in the cylinder body, a cylinder sealing cover is connected to the upper opening of the cylinder body, a cylinder shaft is connected to the connecting seat by a connecting bolt, one end of the cylinder shaft passes through the cylinder sealing cover and is slidably connected in the second cylinder, and the first air supply hole and the second air supply hole are connected at the upper and lower ends of the side wall of the second cylinder.

[0009] Preferably, an upper shock absorbing block and a lower shock absorbing block are respectively fixed to both end surfaces of the connecting seat close to the cylinder body.

[0010] Preferably, a limit plate is fixed to the upper end of the guide rail.

[0011] Preferably, a dustproof cover is connected to the connecting seat outside the sliding block.

[0012] The technical solution of the utility model can achieve the following beneficial effects: (1) Through the radial floating mechanism, the floating ring, floating outer ring, floating head and floating groove are used to realize the radial floating deflection capability of the spindle assembly during the grinding process, thereby reducing the rigidity between the spindle assembly and the connected grinding head and the workpiece, thereby avoiding damage to the spindle assembly and the grinding head due to excessive rigidity between the workpiece and the spindle assembly. In addition, the cylinder, piston and wear-resistant ring are used to limit the radial deflection of the spindle assembly, thereby avoiding damage caused by excessive deflection of the spindle assembly and affecting the grinding effect. At the same time, the spindle can be restored to its original position when not subjected to external force, thereby facilitating subsequent grinding. (2) Through the axial floating mechanism, the spindle assembly has axial floating performance during the grinding process, thereby avoiding damage to the spindle assembly and the grinding head due to excessive rigidity between the spindle assembly and the workpiece and the spindle assembly. (3) The upper protective flange, the lower protective flange, the upper protective rubber and the lower protective rubber can be used to protect the two ends of the electric spindle, thereby preventing foreign dust, debris and other debris from entering the floating outer ring and the cylinder housing through the spindle, thereby affecting the normal operation of the floating outer ring and other components in the cylinder housing. The technical solution of the utility model has broad application prospects in the field of electric spindle technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a stereoscopic diagram of a high-speed rotating main shaft with bidirectional floating shaft diameter according to the utility model.

[0014] Figure 2 It is a cross-sectional view of a high-speed rotating main shaft with bidirectional floating shaft diameter according to the utility model.

[0015] Figure 3 for Figure 2 A magnified image of area A.

[0016] Among them, 1. main shaft assembly, 2. limit ring, 3. floating ring, 4. floating outer ring, 5. floating groove, 6. floating head, 7. cylinder housing, 8. wear-resistant ring, 9. first cylinder, 10. piston, 11. floating rod, 12. air supply ring groove, 13. cylinder cover plate, 14. upper protective flange, 15. upper protective rubber, 16. lower protective flange, 17. lower protective rubber, 18. air supply hole, 19. connecting seat, 20. sliding block, 21. guide rail, 22. base, 23. upper shock absorber block, 24. lower shock absorber block, 25. cylinder sealing cover, 26. cylinder body, 27. second cylinder, 28. cylinder shaft, 29. first air supply hole, 30. second air supply hole, 31. dust cover, 32. limit plate. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions of various embodiments of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0018] In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] like Figure 1-3 The high-speed rotating spindle with bidirectional floating shaft diameter shown includes a spindle assembly 1, which is composed of a common driving motor assembly and a rotor assembly on the market. A non-circular plug slot is opened at one end of the driving motor assembly, and a non-circular plug connector is extended from the rotor assembly. The plug connector is plugged into the plug slot, which facilitates the detachable connection of the driving motor assembly and the rotor assembly through the non-circular plug connector and the plug slot, and facilitates the replacement and maintenance of the driving motor assembly and the rotor assembly. The driving motor assembly and the rotor assembly are integrally packaged and formed by the assembly shell, which facilitates the assembly of the entire spindle assembly 1 and further facilitates later maintenance.

[0020] like Figure 1-3 The high-speed rotating spindle with bidirectional floating shaft diameter shown in the figure has a spindle assembly 1 externally connected with a radial floating mechanism including a limit ring 2, a floating ring 3, a floating outer ring 4, a cylinder housing 7 and a cylinder cover plate 13, constituting a structure that enables the spindle assembly 1 to float and deflect relatively in the radial direction through the radial floating mechanism. After the entire device is connected to the robot arm through the radial floating mechanism, the spindle assembly 1 can offset the robot arm through the radial floating mechanism to achieve radial floating deflection of a certain angle, thereby reducing the rigidity between the spindle assembly 1 and the connected grinding head and the workpiece, and avoiding damage to the spindle assembly 1 and the grinding head due to excessive rigidity between the workpiece.

[0021] like Figure 1-3In the high-speed rotating spindle with bidirectional floating of the shaft diameter shown, the limiting ring 2 is interference-connected on the outer end face of the spindle assembly 1, so that the limiting ring 2 is connected to the outer end face of the spindle assembly 1. The floating ring 3 is detachably fixedly connected to the limiting ring 2 by bolts, so that the floating ring 3 is connected to the limiting ring 2, and then the floating ring 3 is connected and limited by the limiting ring 2. The floating outer ring 4 is sleeved outside the floating ring 3, and the outer end face of the floating ring 3 is provided with a plurality of floating heads 6, and the inner end face of the floating outer ring 4 is provided with a plurality of floating grooves 5. The floating heads 6 are slidably connected in the floating grooves 5, so that the floating ring 3 and the floating outer ring 4 can be radially deflected relative to each other through the floating heads 6 and the floating grooves 5, thereby realizing the relative radial floating deflection between the floating outer ring 4 and the spindle assembly 1. The outer end surface of the floating ring 3 is provided with a plurality of plug holes, one end of the floating head 6 is plugged into the plug hole, and the other end is outside the plug hole, and a point outside the plug hole is in an arc shape, so that the floating ring 3 contacts the floating outer ring 4 through the floating head 6, and at the same time, the arc-shaped floating head 6 is used to reduce the friction when the floating ring 3 and the floating outer ring 4 are relatively deflected. The outer end surface of the limiting ring 2 is extended with a limiting protrusion that limits the floating outer ring 4, so that the floating outer ring 4 is limited by the limiting protrusion to prevent the floating outer ring 4 from falling off from the limiting ring 2.

[0022] like Figure 1-3The high-speed rotating main shaft with bidirectional floating axial diameter shown in the figure has a cylinder housing 7 that is detachably fixedly connected to the end of the floating outer ring 4 away from the limiting protrusion by bolts, so that the cylinder housing 7 is connected to the floating outer ring 4, so that the cylinder housing 7 can be radially enlarged and deflected relative to the floating ring 3. A plurality of first cylinders 9 connected by air transmission ring grooves 12 are provided in the cylinder housing 7, so that the same air pressure can be maintained in the plurality of first cylinders 9. A piston 10 is slidably arranged in the first cylinder 9, and a first clamping ring groove is provided on the outer end face of the piston 10. A first sealing ring is clamped and fixed in the first clamping ring groove, so that the first sealing ring is clamped and limited by the first clamping ring groove to prevent the first sealing ring from detaching from the piston 10, and then the gap between the piston 10 and the first cylinder 9 is blocked by the first sealing ring, so that the first cylinder 9 above the piston 10 maintains an independent air chamber. A floating rod 11 with one end extending outside the first cylinder 9 is welded or detachably fixedly connected to the piston 10 by bolts, so that the floating rod 11 is connected to the piston 10 to realize that the piston 10 slides in the first cylinder 9 and drives the floating rod 11 to move relative to the first cylinder 9. The end of the cylinder housing 7 close to the floating ring 3 is detachably fixedly connected by bolts with a wear-resistant ring 8, and the floating rod 11 penetrates the wear-resistant ring 8 and contacts the floating ring 3, so that when the floating ring 3 and the floating outer ring 4 float and deflect relative to each other, the floating ring 3 presses the floating rod 11, and the floating rod 11 drives the piston 10 to slide in the first cylinder 9, thereby limiting the floating deflection angle of the floating ring 3 and the floating outer ring 4, and at the same time, the floating deflection of the floating ring 3 and the floating outer ring 4 is further limited by the wear-resistant ring 8. In addition, the wear-resistant ring 8 can also limit the floating rod 11, so that the floating rod 11 can only move up and down, and avoid tilting to affect the normal sliding of the piston 10 in the first cylinder 9.

[0023] like Figure 1-3The high-speed rotating main shaft with bidirectional floating shaft diameter shown in the figure has a cylinder cover plate 13 detachably connected to the cylinder housing 7 by bolts, so that the upper end of the cylinder housing 7 is sealed and limited by the cylinder cover plate 13. The cylinder cover plate 13 is provided with an air delivery hole 18 connected to the cylinder, and the air delivery hole 18 is connected to the external air pump, so that the air with moving pressure is delivered to the cylinder housing 7 through the air delivery hole 18, so as to maintain the stability of the air pressure in the independent air chamber above the piston 10 of the first cylinder 9. Specifically, the cylinder housing 7 is provided with an air delivery ring groove 12 connected to a plurality of first cylinders 9 at one end away from the floating outer ring 4, and the air delivery hole 18 is connected to the air delivery ring groove 12, so that the air delivery hole 18 delivers a certain pressure of air to the air delivery ring groove 12. A second snap-in ring groove and a third snap-in ring groove are provided on the cylinder housing 7 on both sides of the air delivery ring groove 12, and a second sealing ring and a third sealing ring are respectively snap-fitted and fixed in the second snap-in ring groove and the third snap-in ring groove, so that the second sealing ring and the third sealing ring are respectively snap-fitted and limited by the second snap-in ring groove and the third snap-in ring groove to prevent the second sealing ring and the third sealing ring from detaching from the cylinder housing 7, and then the second sealing ring and the third sealing ring are used to seal the gap between the cylinder housing 7 and the cylinder cover plate 13 on both sides of the air delivery ring groove 12 to prevent the air delivered to the air delivery ring groove 12 through the air delivery hole 18 from leaking from the gap between the cylinder housing 7 and the cylinder cover plate 13 on both sides of the air delivery ring groove 12, thereby affecting the stability of the air pressure in the independent air chamber above the piston 10 of the first cylinder 9.

[0024] like Figure 1-3 The high-speed rotating spindle with bidirectional floating shaft diameter shown in the figure has a connecting hole connected to the interior on the side wall of the cylinder housing 7, and the connecting hole is connected to the external air source, so that air with moving air pressure is transported into the cylinder housing 7 through the connecting hole, thereby preventing external dust and other debris from entering the gap between the cylinder housing 7 and the spindle assembly 1, affecting the normal floating effect of the radial floating mechanism.

[0025] like Figure 1-3 The high-speed rotating spindle with bidirectional floating of the axis diameter shown in the figure has a connecting seat 19 extending from the radial floating mechanism. Specifically, the connecting seat 19 is formed by extending the outer end surface of the cylinder housing 7, so that the spindle assembly 1 can radially float and deflect relative to the connecting seat 19. The connecting seat 19 is detachably fixedly connected with an axial floating mechanism including a base 22, a cylinder body 26, a guide rail 21 and a sliding block 20 by bolts, forming a structure that enables the spindle assembly 1 to float and move relative to the axial direction through the axial floating mechanism. By using the axial floating mechanism, after the entire device is connected to the robot arm, the spindle assembly 1 can be axially floated relative to the robot arm, reducing the rigidity between the spindle assembly 1 and the connected grinding head and the workpiece, and avoiding damage to the spindle assembly 1 and the grinding head due to excessive rigidity between the workpiece and the spindle assembly 1.

[0026] like Figure 1-3The high-speed rotating spindle with bidirectional floating axis diameter shown in the figure, the cylinder body 26 and the guide rail 21 and the base 22 are detachably fixed by bolts so that the cylinder body 26 is connected to the guide rail 21 and the base 22, and then the base 22 is detachably fixedly connected to the robot arm by bolts. The sliding block 20 is detachably fixedly connected to the connecting seat 19 by bolts so that the sliding hole is connected to the connecting seat 19. The sliding block 20 is slidably connected to the guide rail 21 to realize the relative movable connection between the radial floating mechanism and the axial floating mechanism. The upper end of the guide rail 21 is detachably fixedly connected to the limit plate 32 by bolts so that the movement of the sliding block 20 on the guide rail 21 is limited by the limit plate 32 to prevent the sliding block 20 from detaching from the upper end of the guide rail 21 during maintenance. A dust cover 31 is detachably fixedly connected to the connecting seat 19 outside the sliding block 20 by bolts, so that the dust cover 31 can isolate the components of the axial floating mechanism such as the sliding block 20 and the cylinder body 26 from the outside world, preventing foreign dust and other debris from falling onto the axial floating mechanism and affecting the normal operation of the axial floating mechanism.

[0027] like Figure 1-3The high-speed rotating main shaft with bidirectional floating shaft diameter shown in the figure has a second cylinder 27 in the cylinder body 26, and a cylinder sealing cover 25 is detachably fixedly connected to the upper opening of the cylinder body 26 by bolts, so that the upper opening of the cylinder body 26 can be blocked by the cylinder sealing cover 25. The cylinder sealing cover 25 partially extends into the second cylinder 27, and the outer end surface of the part extending into the second cylinder 27 is provided with a fourth clamping ring groove, and a fourth sealing ring is clamped and fixed in the fourth clamping ring groove, so that the fourth sealing ring is clamped and limited by the fourth clamping ring groove to prevent the fourth sealing ring from being separated from the cylinder sealing cover 25, and then the gap between the cylinder sealing cover 25 and the second cylinder 27 is blocked by the fourth sealing ring, so that a sealed air chamber is formed in the second cylinder 27. The cylinder shaft 28 is connected to the connecting seat 19 by connecting bolts, so that the cylinder shaft 28 and the connecting seat 19 are connected together. An upper damping block 23 and a lower damping block 24 are respectively provided above and below the connecting seat 19 at the cylinder shaft 28. The upper damping block 23 and the lower damping block 24 are common damping plates on the market, so that the vibration when the axial floating mechanism and the radial floating mechanism are connected is reduced by the upper damping block 23 and the lower damping block 24. One end of the cylinder shaft 28 passes through the cylinder sealing cover 25 and is slidably connected in the second cylinder 27, so that the cylinder body 26 and the connecting seat 19 can be moved relative to each other by the cylinder shaft 28 sliding in the second cylinder 27, thereby realizing the relative movement of the radial floating mechanism and the axial floating mechanism. A fifth snap ring groove is provided on the cylinder sealing cover 25 where the cylinder shaft 28 passes through the cylinder sealing cover 25, and a fifth sealing ring is snap-fastened in the fifth snap ring groove. The cylinder shaft 28 passes through the fifth sealing ring, so that the fifth sealing ring is snap-fastened and limited by the fifth snap ring groove to prevent the fifth sealing ring from being separated from the cylinder sealing cover 25, and then the fifth sealing ring is used to block the gap between the cylinder sealing cover 25 and the cylinder shaft 28, so that a sealed air chamber is formed in the second cylinder 27. A sixth snap ring groove is provided on the outer end surface of one end of the cylinder shaft 28 located in the second cylinder 27, and a sixth sealing ring is snap-fastened in the sixth snap ring groove, so that the sixth sealing ring is snap-fastened and limited by the sixth snap ring groove to prevent the sixth sealing ring from being separated from the cylinder shaft 28, and then the sixth sealing ring is used to block the gap between the cylinder shaft 28 and the second cylinder 27, so that two independent and sealed air chambers are formed in the second cylinder 27. The upper and lower ends of the side wall of the second cylinder 27 are connected with a first air supply hole 29 and a second air supply hole 30, so that air is supplied to two air chambers formed in the second cylinder 27 at both ends of the cylinder shaft 28 through the first air supply hole 29 and the second air supply hole 30 respectively, thereby enabling the cylinder shaft 28 to float and slide in the second cylinder 27.

[0028] like Figure 1-3The high-speed rotating spindle with bidirectional floating of the shaft diameter shown in the figure has an upper protective flange 14 and a lower protective flange 16 detachably fixed at both ends of the radial floating mechanism by bolts, specifically, the upper protective flange 14 is detachably fixedly connected to the cylinder cover by bolts, and the lower protective flange 16 is detachably fixedly connected to the floating outer ring 4 by bolts. An upper protective rubber 15 and a lower protective rubber 17 are respectively clamped and fixed on the upper protective flange 14 and the lower protective flange 16, and one end of the upper protective rubber 15 and the lower protective rubber 17 away from the upper protective flange 14 and the lower protective flange 16 is closely arranged with the outer wall of the spindle assembly 1, so that the gap between the two ends of the radial floating mechanism and the spindle assembly 1 is blocked by the upper protective rubber 15 and the lower protective rubber 17, so as to prevent foreign dust and other debris from entering the interior through the gap between the two ends of the radial floating mechanism and the spindle assembly 1, thereby affecting the normal operation of the radial floating mechanism. Specifically, an upper clamping groove and a lower clamping groove are respectively provided on the upper protective flange 14 and the lower protective flange 16, and one end of the upper protective rubber 15 and the lower protective rubber 17 are respectively clamped and fixed in the upper clamping groove and the lower clamping groove, and the upper protective rubber 15 and the lower protective rubber 17 are tightly fitted with the outer surface of the main shaft assembly 1, so that the upper protective rubber 15 and the lower protective rubber 17 can be clamped and limited by the upper clamping groove and the lower clamping groove respectively to prevent the upper protective rubber 15 and the lower protective rubber 17 from being separated from the upper protective flange 14 and the lower protective flange 16 respectively, and then the upper protective rubber 15 and the lower protective rubber 17 are used to protect and block the two ends of the main shaft assembly 1 respectively to prevent external dust, debris and other debris from entering the interior through the gap between the two ends of the radial floating mechanism and the main shaft assembly 1, thereby affecting the normal operation of the radial floating mechanism. A plurality of exhaust holes are provided on the lower protective rubber 17, and the exhaust holes are connected with the ventilation grooves provided on the lower protective flange 16, so that the cavity between the upper protective rubber 15 and the lower protective rubber 17 is connected with the outside through the exhaust holes, ensuring that the cavity between the upper protective rubber 15 and the lower protective rubber 17 is balanced with the external air pressure, so as to facilitate the floating deflection of the main shaft assembly 1 in the cavity between the upper protective rubber 15 and the lower protective rubber 17.

[0029] Unless otherwise specified, the device elements involved in the above embodiments are all conventional device elements, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0030] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A high-speed rotating spindle with bidirectional floating shaft diameter, comprising a spindle assembly (1), characterized in that: The main shaft assembly (1) is externally connected to a radial floating mechanism, forming a structure by which the main shaft assembly (1) can float and deflect relatively in the radial direction through the radial floating mechanism; the radial floating mechanism is extended with a connecting seat (19); the connecting seat (19) is connected to an axial floating mechanism, forming a structure by which the main shaft assembly (1) can float and move relatively in the axial direction through the axial floating mechanism; an upper protective flange (14) and a lower protective flange (16) are respectively fixed at both ends of the radial floating mechanism; an upper protective rubber (15) and a lower protective rubber (17) are respectively clamped and fixed on the upper protective flange (14) and the lower protective flange (16).

2. The high-speed rotating spindle with bidirectional floating shaft diameter according to claim 1, characterized in that: The radial floating mechanism comprises a limiting ring (2), a floating ring (3), a floating outer ring (4), a cylinder housing (7) and a cylinder cover plate (13); the limiting ring (2) is connected to the main shaft assembly (1); the floating ring (3) is connected to the limiting ring (2); the floating outer ring (4) is sleeved outside the floating ring (3); the outer end surface of the floating ring (3) is provided with a plurality of floating heads (6); the inner end surface of the floating outer ring (4) is provided with a plurality of floating grooves (5); the floating heads (6) are slidably connected in the floating grooves (5); and the outer end surface of the limiting ring (2) is extended with a limiting protrusion for limiting the floating outer ring (4).

3. The high-speed rotating spindle with bidirectional floating shaft diameter according to claim 2, characterized in that: The cylinder housing (7) is connected to an end of the floating outer ring (4) away from the limiting protrusion. A plurality of interconnected first cylinders (9) are provided in the cylinder housing (7). A piston (10) is slidably provided in the first cylinder (9). A floating rod (11) is connected to the piston (10) and one end of the floating rod (11) extends outside the first cylinder (9). A wear-resistant ring (8) is connected to the end of the cylinder housing (7) close to the floating ring (3). The floating rod (11) penetrates the wear-resistant ring (8) and contacts the floating ring (3). A cylinder cover plate (13) is connected to the cylinder housing (7). A gas transmission hole (18) communicating with the cylinder is provided on the cylinder cover plate (13).

4. The high-speed rotating spindle with bidirectional floating shaft diameter according to claim 3 is characterized in that: An air delivery ring groove (12) connected to a plurality of first cylinders (9) is formed at one end of the cylinder housing (7) away from the floating outer ring (4), and the air delivery hole (18) is connected to the air delivery ring groove (12).

5. The high-speed rotating spindle with bidirectional floating shaft diameter according to claim 2, characterized in that: The connecting seat (19) is formed by extending the outer end surface of the cylinder housing (7).

6. The high-speed rotating main shaft with bidirectional floating shaft diameter according to claim 5, characterized in that: The axial floating mechanism comprises a base (22), a cylinder body (26), a guide rail (21) and a sliding block (20); the cylinder body (26) and the guide rail (21) are connected to the base (22); the sliding block (20) is connected to a connecting seat (19) and is slidably connected to the guide rail (21); a second cylinder (27) is provided in the cylinder body (26); a cylinder sealing cover (25) is connected to the upper opening of the cylinder body (26); a cylinder shaft (28) is connected to the connecting seat (19) via a connecting bolt; one end of the cylinder shaft (28) passes through the cylinder sealing cover (25) and is slidably connected to the second cylinder (27); a first air supply hole (29) and a second air supply hole (30) are connected at upper and lower ends of a side wall of the second cylinder (27).

7. The high-speed rotating main shaft with bidirectional floating shaft diameter according to claim 6, characterized in that: An upper shock absorbing block (23) and a lower shock absorbing block (24) are respectively fixed to the two end surfaces of the connecting seat (19) close to the cylinder body (26).

8. The high-speed rotating main shaft with bidirectional floating shaft diameter according to claim 6, characterized in that: A limiting plate (32) is fixed to the upper end of the guide rail (21).

9. The high-speed rotating main shaft with bidirectional floating shaft diameter according to claim 6, characterized in that: A dustproof cover (31) is connected to the connecting seat (19) outside the sliding block (20).

Images