A high-precision hollow rotating platform

Abstract

The present invention relates to the technical field of parts of precision mechanical equipment, and discloses a high-precision hollow rotating platform, comprising a fixed seat, an inner cavity of the fixed seat is provided with a hollow cylinder platform, two cross roller bearings are fixedly connected to the side wall of the hollow cylinder platform, the cavity wall of the fixed seat is provided with two annular embedding grooves, the outer rings of the two cross roller bearings are respectively embedded in the two annular embedding grooves and fixed, the top and bottom of the inner ring of the cross roller bearing and the top and bottom of the outer ring have a height difference, and the inner ring side wall protrudes out of the outer ring and fits with the wall of the fixed seat, and the two cross roller bearings are used to evenly share the load force borne by the hollow cylinder platform; the present invention connects the hollow cylinder platform with the fixed seat by providing two cross roller bearings, and the weight borne by the device after installation can be evenly distributed to the two cross roller bearings, thereby improving the load force of the device, and also avoiding the single cross roller bearing being subjected to a large weight, resulting in increased friction and affecting the transmission accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of precision mechanical equipment parts, and more specifically to a high-precision hollow rotating platform. Background Art

[0002] Hollow rotating platform is used in a variety of rotating motion occasions. It combines high work efficiency, high precision, high rigidity and high cost performance. It is a special mechanical device with a hollow structural design. Its core part is a freely rotating platform, which is usually mounted on a precision transmission system. The platform realizes high-precision rotation of objects in the horizontal direction through the rotation torque of the motor. The rotation angle range is wide, ranging from 180 degrees to 360 degrees, and the rotation speed can be adjusted according to actual needs.

[0003] At present, the hollow rotating platform still has defects. For example, long-term use or heavy load bearing will lead to increased transmission friction, affecting transmission accuracy. Secondly, the structural flexibility is poor. In order to maintain the performance and cleanliness of the lubricant, the existing hollow rotating platforms on the market usually need to be manually changed regularly. This process is not only cumbersome and time-consuming, but may also increase the downtime of the equipment and affect production efficiency. At the same time, during the lubrication process, the lubricant is often difficult to achieve continuous and uniform distribution in the sealed chamber, which may lead to insufficient lubrication in some areas of the transmission mechanism, thereby affecting transmission accuracy and efficiency. Summary of the invention

[0004] In order to overcome the above defects of the prior art, the present invention provides a high-precision hollow rotating platform to solve the problems in the above background technology that the transmission friction of the current traditional hollow rotating platform increases and affects the transmission accuracy and the structural flexibility is poor.

[0005] The present invention provides the following technical solution: a high-precision hollow rotating platform, comprising a fixed seat, wherein the inner cavity of the fixed seat is provided with a hollow cylinder, and the side wall of the hollow cylinder is fixedly connected with two cross roller bearings, and the cavity wall of the fixed seat is provided with two annular embedded grooves, and the outer rings of the two cross roller bearings are respectively embedded in the two annular embedded grooves and fixed, and the top and bottom of the inner ring of the cross roller bearing and the top and bottom of the outer ring have a height difference, and the inner ring side wall protrudes from the outer ring and fits the wall of the fixed seat;

[0006] The two cross roller bearings are used to evenly share the load force on the hollow cylinder platform, and the two cross roller bearings cooperate with the hollow cylinder platform to form a sealed chamber in the inner cavity of the fixed seat, and a groove chamber is opened on the inner wall of the sealed chamber, and a transmission mechanism driven by a driving motor is installed on the inner wall of the groove chamber. The transmission mechanism is connected to the hollow cylinder platform, and the sealed chamber is used to seal the transmission mechanism to isolate external dust;

[0007] An oil delivery device is arranged in the sealing chamber of the fixing seat, and the oil delivery device comprises an arc frame fixedly connected to the sealing chamber;

[0008] A lubrication cavity is arranged at a position corresponding to the hollow cylinder platform inside the fixing seat, and the lubrication cavity stores lubricating oil and lubricates the hollow cylinder platform, the cross roller bearing and the transmission mechanism.

[0009] Furthermore, the inner ring side wall of the cross roller bearing is provided with an annular groove protruding from the outer ring, and a rubber sealing ring in contact with the wall of the fixed seat cavity is installed in the annular groove.

[0010] Furthermore, an oil inlet pipe connected to the sealing chamber is arranged outside the fixing seat.

[0011] Furthermore, the oil delivery device also includes a plurality of rolling wheels, the arc frame is fixedly connected to the inner wall of the sealing chamber of the fixed seat, the inner wall of the arc frame is provided with an arc-shaped inner groove, an oil drain hose is fixedly installed in the arc-shaped inner groove, one end of the oil drain hose passes through the outside of the fixed seat, a plurality of the rolling wheels are fixedly connected to the side walls of the hollow cylinder platform, and the oil inlet pipe is located at one end of the sealing chamber and passes through the oil drain hose and is flush with the inner wall of the arc-shaped inner groove.

[0012] Furthermore, the oil drain hose and the oil inlet pipe are both provided with a one-way valve at one end outside the fixing seat.

[0013] Furthermore, the inner cavity of the lubrication cavity is provided with multiple oil bags, and the oil bags are made of a material with strong resilience. A pressure plate is provided on one side of the oil bag, and a pressure ball is provided on one side of the pressure plate. The pressure ball is arranged in a movable hole opened on the inner side of the lubrication cavity, and the pressure ball can move back and forth through the movable hole. An oil drain pipe is respectively provided on both sides of the pressure ball, and the oil drain pipe is arranged in the lubrication hole opened on the inner side of the lubrication cavity. Lubricating oil can be injected into the sealed chamber through the lubrication hole. A plurality of protrusions are provided on the outer side of the hollow cylinder platform, and the height position of the protrusions corresponds to that of the pressure ball.

[0014] Furthermore, an oil filling hole is provided at the bottom of the lubrication cavity, and the oil filling hole is connected to the top of the oil drain hose. The inner cavity of the lubrication cavity is located at the position of the oil filling hole without an oil bag, and is configured as a storage section. Oil replenishing pipes are provided on one side of the oil bags at both ends of the storage section, and the lubricating oil in the storage section is absorbed through the oil replenishing pipes. The multiple sections of the oil bags are interconnected.

[0015] Furthermore, a plurality of oil suction holes are provided on the outer side of the oil replenishing pipe, and a leak-proof ring is provided in the inner cavity of the oil replenishing pipe at positions corresponding to the oil suction holes, and a plurality of springs are provided on one side of the leak-proof ring.

[0016] Furthermore, a sealing tube with an inner diameter smaller than that of the oil drain pipe is provided at one end of the inner cavity of the oil drain pipe, and the sealing tube is connected to the inner cavity of the oil bag, and a sealing plate is provided in the inner cavity of the sealing tube, and the sealing plate is transitionally matched with the inner cavity of the sealing tube, and one side of the sealing plate is connected to the inner wall of the sealing tube through a torsion spring.

[0017] Furthermore, the transmission mechanism is composed of a worm wheel, a worm, and an angle transmission mechanism. The worm wheel is fixedly connected to the side wall of the hollow cylinder platform, the worm is installed in the groove chamber through an end block, and the angle transmission mechanism is composed of two meshing bevel gears.

[0018] Technical effects and advantages of the present invention:

[0019] The present invention connects the hollow cylinder platform with the fixed seat by arranging two cross roller bearings. After the device is installed, the weight received can be evenly distributed to the two cross roller bearings, thereby improving the load capacity of the device. At the same time, it also avoids the single cross roller bearing receiving a large weight, which leads to an increase in friction and affects the transmission accuracy.

[0020] In addition, through the structural design of the cross roller bearing and the cooperation with the hollow cylinder, the two cross roller bearings can isolate the inner cavity of the fixed seat from the sealed chamber. The transmission mechanism is arranged in the sealed chamber and soaked in lubricating oil. On the one hand, it can prevent external dust from adhering to the surface of the transmission mechanism to increase the friction and affect the transmission accuracy of the device. On the other hand, the friction of the transmission mechanism during operation can be reduced by soaking in lubricating liquid, so as to increase the transmission accuracy of the device.

[0021] On the basis of the above structure, the oil drain hose, oil inlet pipe, rolling wheel are matched and connected to the external oil tank. The rotation of the hollow cylinder is used as the driving force, so that the lubricating oil in the oil tank can circulate in the sealed chamber to avoid the performance degradation of the lubricating oil after long-term use. Compared with the traditional technology, this structural setting does not require disassembly of the machine for oil change, making the maintenance process more convenient.

[0022] A lubrication cavity is provided to absorb the lubricating oil injected by the oil drain hose. On this basis, components such as the oil bag, oil drain ball and oil plate use the rotational power of the hollow cylinder to drive the extrusion and recovery of the oil bag, forming a cycle of negative pressure attraction and positive pressure discharge. This not only ensures the continuous and uniform distribution of the lubricating oil in the sealed chamber, effectively improving the transmission accuracy and efficiency, but also achieves the natural filtration of tiny particles in the lubricating oil through the extrusion and recovery action of the oil bag, reduces the wear of transmission parts, and extends the service life of the equipment. At the same time, it eliminates the tediousness of manual oil change, making maintenance more convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2It is an exploded schematic diagram of the overall structure of the present invention;

[0025] Figure 3 For the present invention Figure 1 A side view of the cross-sectional structure of the fixing seat in FIG.

[0026] Figure 4 For the present invention Figure 2 Schematic diagram of the cross roller bearing structure;

[0027] Figure 5 For the present invention Figure 1 A schematic diagram of the cross-sectional structure of the fixing seat in FIG.

[0028] Figure 6 For the present invention Figure 2 Schematic diagram of the split structure of the steering drive mechanism;

[0029] Figure 7 For the present invention Figure 6 A schematic diagram of a cross-sectional structure of a rotation mechanism for adjusting direction;

[0030] Figure 8 For the present invention Figure 6 A front view of the structure of the direction adjustment and rotation mechanism;

[0031] Fig. 9 For the present invention Figure 6 A schematic diagram of the second structure of the direction adjustment and rotation mechanism;

[0032] Fig.10 For the present invention Figure 2 Schematic diagram of the transmission mechanism structure.

[0033] The accompanying drawings are marked as follows: 1. fixed seat; 2. hollow cylinder platform; 21. bump; 3. cross roller bearing; 4. transmission mechanism; 5. lubrication chamber; 11. annular groove; 12. groove chamber; 31. rubber sealing ring; 6. arc frame; 61. oil discharge hose; 62. oil inlet pipe; 63. rolling wheel; 51. oil bag; 52. oil supply pipe; 521. leak-proof ring; 522. spring; 523. oil suction hole; 53. oil drain pipe; 531. sealing pipe; 532. sealing plate; 533. torsion spring; 54. pressure plate; 55. pressure ball; 56. oil filling hole; 41. worm gear; 42. worm; 43. angle transmission mechanism; 7. drive motor. DETAILED DESCRIPTION

[0034] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0035] Reference Figure 1-Figure 5The present invention provides a high-precision hollow rotating platform, including a fixed seat 1, a hollow cylinder 2 is arranged in the inner cavity of the fixed seat 1, two cross roller bearings 3 are fixedly connected to the side wall of the hollow cylinder 2, two annular embedded grooves 11 are arranged in the cavity wall of the fixed seat 1, the outer rings of the two cross roller bearings 3 are respectively embedded in the two annular embedded grooves 11 and fixed, the top and bottom of the inner ring of the cross roller bearing 3 and the top and bottom of the outer ring have a height difference, and the inner ring side wall protrudes from the outer ring and fits the wall of the fixed seat 1;

[0036] The two cross roller bearings 3 are used to evenly share the load force on the hollow cylinder platform 2, and the two cross roller bearings 3 cooperate with the hollow cylinder platform 2 to form a sealed chamber in the inner cavity of the fixed seat 1, and a groove chamber 12 is opened on the inner wall of the sealed chamber. A transmission mechanism 4 driven by a drive motor 7 is installed on the inner wall of the groove chamber 12. The transmission mechanism 4 is connected to the hollow cylinder platform 2, and the sealed chamber is used to seal the transmission mechanism 4 to isolate external dust;

[0037] An oil delivery device is arranged in the sealed chamber of the fixing seat 1, and the oil delivery device comprises an arc frame 6 fixedly connected to the sealed chamber;

[0038] A lubrication cavity 5 is provided inside the fixing seat 1 at a position corresponding to the hollow cylinder platform 2 . The lubrication cavity 5 stores lubricating oil and lubricates the hollow cylinder platform 2 , the cross roller bearing 3 , and the transmission mechanism 4 .

[0039] Reference Figure 2 , Figure 3 The inner ring side wall of the cross roller bearing 3 is protruding from the outer ring and is provided with an annular groove, in which a rubber sealing ring 31 is installed to fit with the cavity wall of the fixed seat 1. Since liquid lubricating oil is stored in the sealed cavity of the fixed seat 1, in order to prevent the liquid lubricating oil from leaking from the gap between the fixed seat 1 and the cross roller bearing 3 during the operation of the device, the rubber sealing ring 31 is added to improve the sealing of the gap and reduce the probability of oil leakage.

[0040] Reference Figure 5 An oil inlet pipe 62 connected to the sealing chamber is arranged outside the fixing seat 1. Since the lubricating performance of the lubricating oil decreases during long-term use, and the sealing structure of the device is not easy to disassemble, the oil changing operation is difficult. The oil inlet pipe 62 can be used to complete the quick oil filling operation, thereby improving convenience.

[0041] Reference Figure 5The oil delivery device also includes a plurality of rolling wheels 63. The arc frame 6 is fixedly connected to the inner wall of the sealed chamber of the fixed seat 1. An arc-shaped inner groove is provided on the inner wall of the arc frame 6. An oil drain hose 61 is fixedly installed in the arc-shaped inner groove. One end of the oil drain hose 61 passes through the outside of the fixed seat 1. A plurality of rolling wheels 63 are fixedly connected to the side wall of the hollow cylinder 2. The oil inlet pipe 62 is located at one end of the sealed chamber and passes through the oil drain hose 61 and is flush with the inner wall of the arc-shaped inner groove. Frequent oil change and maintenance are performed during use, which affects work efficiency. By connecting the oil drain hose 61 and the oil inlet pipe 62 to the external lubricating oil storage tank, when the hollow cylinder 2 rotates during the operation of the device, the plurality of rolling wheels 63 are fixedly connected to the side wall of the hollow cylinder 2. The wheel 63 rolls and squeezes the oil drain hose 61. By adopting the peristaltic pump principle, the oil drain hose 61 can draw the lubricating oil in the sealed chamber of the fixed seat 1 to be discharged into the external lubricating oil storage tank. The negative pressure in the sealed chamber is formed by the discharged oil body to generate suction, and the lubricating oil in the external oil tank is re-drawn through the oil inlet pipe 62 and injected into the sealed chamber. In this way, the lubricating oil in the external oil tank can circulate in the sealed chamber of the fixed seat 1, so as to achieve the effect of indirect expansion of the sealed chamber by the external oil tank, thereby extending the oil change maintenance cycle. The oil inlet pipe 62 is limited to one end of the sealed chamber to prevent the oil inlet pipe 62 from interfering with the running trajectory of the rolling wheel 63.

[0042] Reference Figure 5 The oil discharge hose 61 and the oil inlet pipe 62 are both provided with a one-way valve at one end outside the fixing seat 1 to prevent the oil from flowing back.

[0043] Reference Figure 7 The inner cavity of the lubrication chamber 5 is provided with multiple sections of oil bags 51, and the oil bags 51 are made of a material with strong resilience. A pressure plate 54 is provided on one side of the oil bag 51, and a pressure ball 55 is provided on one side of the pressure plate 54. The pressure ball 55 is arranged in a movable hole opened on the inner side of the lubrication chamber 5, and the pressure ball 55 can move forward and backward through the movable hole. An oil drain pipe 53 is respectively provided on both sides of the pressure ball 55, and the oil drain pipe 53 is arranged in the lubrication hole opened on the inner side of the lubrication chamber 5. Lubricating oil can be injected into the sealed chamber through the lubrication hole. A plurality of protrusions 21 are provided on the outer side of the hollow cylinder 2, and the height position of the protrusion 21 corresponds to the pressure ball 55. When the hollow cylinder 2 rotates, the protrusion 21 will not The pressure ball 55 is continuously squeezed to move the pressure ball 55 backward, and the backward movement of the pressure ball 55 pushes the pressure plate 54 to move backward, so that the oil bag 51 is squeezed by the pressure plate 54 to generate positive pressure in the inner cavity of the oil bag 51, so that the lubricating oil can be transported from the inner cavity of the oil bag 51 to the sealed chamber through the oil drain pipe 53. This arrangement is provided with multiple oil bags 51 and multiple oil drain pipes 53 for simultaneous oil delivery, so that the lubricating oil can be evenly transported to the sealed chamber, and at the same time, some impurities present in the lubricating oil can be isolated, and the oil discharge hose 61 can be prevented from transporting too much and too fast lubricating oil, avoiding lubrication transition and reducing the risk of leakage. The oil bag 51 can be made of silicone rubber, polyether or polyester.

[0044] Reference Figure 5 , Figure 7 , an oil filling hole 56 is provided at the bottom of the lubrication chamber 5, and the oil filling hole 56 is connected to the top of the oil discharge hose 61. The inner cavity of the lubrication chamber 5 is located at the position of the oil filling hole 56 without an oil bag 51, and a storage section is set here. One side of the oil bags 51 at both ends of the storage section is provided with an oil replenishing pipe 52, and the lubricating oil in the storage section is absorbed through the oil replenishing pipe 52. The multiple sections of the oil bags 51 are interconnected. When the hollow cylinder 2 rotates, the oil discharge hose 61 continuously inputs lubricating oil into the storage section. Since the oil bags 51 are continuously squeezed and restored due to their own material characteristics, when the oil bags 51 are squeezed and restored to their original state, negative pressure is generated in their inner cavity. Under the action of negative pressure, the oil in the storage section is absorbed through the oil replenishing pipe 52, and the lubricating oil gradually enters all the oil bags 51. Therefore, when lubricating the components in the sealed chamber, the lubricating oil can be evenly lubricated from multiple directions to avoid uneven lubrication.

[0045] Reference Figure 7 , Figure 8 A plurality of oil suction holes 523 are provided on the outer side of the oil replenishing pipe 52. A leak-proof ring 521 is provided at the inner cavity of the oil replenishing pipe 52 at the corresponding position of the oil suction hole 523. A plurality of springs 522 are provided on one side of the leak-proof ring 521. When negative pressure is generated in the inner cavity of the oil bag 51, suction is generated, so that the leak-proof ring 521 moves backward. The leak-proof ring 521 moves backward to squeeze the spring 522 to deform it, and as the leak-proof ring 521 moves backward, it moves away from the oil suction hole. 523, so that the suction force can absorb the lubricating oil in the storage section and allow it to smoothly enter the inner cavity of the oil bag 51. When the pressure in the inner cavity of the oil bag 51 returns to normal or generates negative pressure, the spring 522 loses pressure and rebounds, and pushes the leak-proof ring 521 to return to its original position, and re-blocks the oil suction hole 523. This can prevent the oil bag 51 from discharging oil into the sealed chamber when positive pressure is generated, and the oil is injected into the storage section through the oil bag 51, thereby ensuring that the lubricating oil can all enter the sealed chamber.

[0046] Reference Fig. 9A sealing tube 531 having an inner diameter smaller than that of the oil drain tube 53 is provided at one end of the inner cavity of the oil drain tube 53, and the sealing tube 531 is communicated with the inner cavity of the oil bag 51, and a sealing plate 532 is provided in the inner cavity of the sealing tube 531, and the sealing plate 532 is transitionally matched with the inner cavity of the sealing tube 531, and one side of the sealing plate 532 is connected to the inner wall of the sealing tube 531 through a torsion spring 533. By providing the sealing plate 532, when negative pressure is generated in the inner cavity of the oil bag 51, the sealing plate 532 is locked in the inner cavity of the sealing tube 531 At this time, the oil drain pipe 53 is in a blocked state to prevent the lubricating oil in the sealed chamber from being sucked back into the oil bag 51. When positive pressure is generated in the inner cavity of the oil bag 51, the thrust generated causes the sealing plate 532 to move forward and enter the oil drain pipe 53. Since there is a gap between the sealing plate 532 and the oil drain pipe 53, the lubricating oil can enter the sealed chamber through the gap for lubrication. In addition, by providing a torsion spring 533, the sealing plate 532 can be retracted after the pressure in the inner cavity of the oil bag 51 returns to normal, so that it can re-block the oil drain pipe 53.

[0047] Reference Fig.10 The transmission mechanism 4 is composed of a worm wheel 41, a worm 42, and an angle transmission mechanism 43. The worm wheel 41 is fixedly connected to the side wall of the hollow cylinder 2, and the worm 42 is installed in the groove chamber 12 through the end block. The angle transmission mechanism 43 is composed of two meshing bevel gears, so that the transmission mechanism 4 transmits the hollow cylinder 2 in a manner of cooperation between the worm wheel 41 and the worm 42, which can achieve better transmission accuracy and self-locking effect.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. The present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-precision hollow rotating platform, characterized in that: The invention comprises a fixed seat (1), wherein the inner cavity of the fixed seat (1) is provided with a hollow cylindrical platform (2), and the side wall of the hollow cylindrical platform (2) is fixedly connected with two cross roller bearings (3), and the cavity wall of the fixed seat (1) is provided with two annular embedded grooves (11), and the outer rings of the two cross roller bearings (3) are respectively embedded in the two annular embedded grooves (11) and fixed, and the top and bottom of the inner ring of the cross roller bearing (3) have a height difference with the top and bottom of the outer ring, and the inner ring side wall protrudes from the outer ring and fits the wall of the fixed seat (1); The two cross roller bearings (3) are used to evenly share the load force on the hollow cylinder platform (2), and the two cross roller bearings (3) cooperate with the hollow cylinder platform (2) to form a sealed chamber in the inner cavity of the fixed seat (1), wherein a groove chamber (12) is provided on the inner wall of the sealed chamber, and a transmission mechanism (4) driven by a drive motor (7) is installed on the inner wall of the groove chamber (12), and the transmission mechanism (4) is connected to the hollow cylinder platform (2), and the sealed chamber is used to seal the transmission mechanism (4) and isolate it from external dust; An oil delivery device is arranged in the sealed chamber of the fixing seat (1), and the oil delivery device comprises an arc-shaped frame (6) fixedly connected to the sealed chamber; A lubrication cavity (5) is provided at a position inside the fixing seat (1) corresponding to the hollow cylindrical platform (2), and the lubrication cavity (5) stores lubricating oil and lubricates the hollow cylindrical platform (2), the cross roller bearing (3), and the transmission mechanism (4); An oil inlet pipe (62) connected to the sealed chamber is disposed outside the fixing seat (1); The oil delivery device also includes a plurality of rolling wheels (63), the arc frame (6) is fixedly connected to the inner wall of the sealed chamber of the fixed seat 1, the inner wall of the arc frame (6) is provided with an arc-shaped inner groove, an oil discharge hose (61) is fixedly installed in the arc-shaped inner groove, one end of the oil discharge hose (61) passes through the outside of the fixed seat (1), the plurality of rolling wheels (63) are fixedly connected to the side wall of the hollow cylinder (2), the oil inlet pipe (62) is located at one end of the sealed chamber and passes through the oil discharge hose (61) and is flush with the inner wall of the arc-shaped inner groove. When the device is in operation The empty cylinder table (2) rotates, causing the plurality of rolling wheels (63) to roll and squeeze the oil discharge hose (61). By adopting the principle of a peristaltic pump, the oil discharge hose (61) can draw the lubricating oil in the sealed chamber of the fixed seat (1) to be discharged into the external lubricating oil storage tank. The negative pressure in the sealed chamber is generated by the discharged oil, generating suction. The lubricating oil in the external oil tank is re-drawn through the oil inlet pipe (62) and injected into the sealed chamber. Thus, the lubricating oil in the external oil tank can circulate in the sealed chamber of the fixed seat (1). The oil drain hose (61) and the oil inlet pipe (62) are both provided with a one-way valve at one end outside the fixing seat (1); The lubrication chamber (5) is provided with a plurality of oil bags (51) in the inner cavity. The oil bags (51) are made of a material with strong resilience. A pressure plate (54) is provided on one side of the oil bag (51). A pressure ball (55) is provided on one side of the pressure plate (54). The pressure ball (55) is arranged in a movable hole provided in the inner side of the lubrication chamber (5). The pressure ball (55) can move forward and backward through the movable hole. An oil drain pipe (53) is provided on each side of the pressure ball (55). The oil drain pipe (53) is provided in the lubrication hole provided in the inner side of the lubrication chamber (5). Lubrication oil can be injected into the sealed chamber through the lubrication hole. A plurality of protrusions (21) are provided on the outer side of the hollow cylinder platform (2). The height position of the protrusions (21) corresponds to that of the pressure ball (55).

2. A high-precision hollow rotating platform according to claim 1, characterized in that: The inner ring side wall of the cross roller bearing (3) is provided with an annular groove protruding from the outer ring, and a rubber sealing ring (31) is installed in the annular groove and fits the cavity wall of the fixing seat (1).

3. The high-precision hollow rotating platform according to claim 1, characterized in that: The transmission mechanism (4) is composed of a worm wheel (41), a worm (42), and an angle transmission mechanism (43); the worm wheel (41) is fixedly connected to the side wall of the hollow cylinder platform (2); the worm (42) is installed in the slot chamber (12) through an end block; and the angle transmission mechanism (43) is composed of two meshing bevel gears.

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