A low friction pneumatic slip ring

Abstract

The present invention relates to the technical field of pneumatic slip rings, and specifically to a low-friction pneumatic slip ring, comprising a first fixed ring, wherein an air inlet hole is provided on one side of the first fixed ring, oil inlet holes are symmetrically provided on the first fixed ring on both sides of the air inlet hole, an anti-rotation socket is provided on the other side of the first fixed ring, and first mounting slots and mounting inner slots are symmetrically provided at both ends of the first fixed ring, and a ventilation slot is provided inside the first fixed ring, and a first layer of sealing is achieved by providing a plurality of sealing ring grooves inside the first fixed ring, and the matching ring grooves on the first half ring and the second half ring are closely matched with the matching sealing ring on the first moving ring to achieve the second layer of sealing, and then the protruding sealing rings on the first half ring and the second half ring are matched with the plug-in ring groove on the second moving ring to achieve the third layer of sealing, and through multi-stage sealing, pneumatic sealing in a rotating state is achieved with a non-contact structure, and the friction resistance caused by the traditional sealing structure is reduced, thereby achieving precise torque control of the rotating shaft.

Description

Technical Field

[0001] The invention relates to the technical field of pneumatic slip rings, in particular to a low-friction pneumatic slip ring. Background Art

[0002] An industrial robot is a multi-joint manipulator or multi-degree-of-freedom machine device for the industrial field. It can perform work automatically and relies on its own power and control capabilities to achieve various functions.

[0003] Industrial robots usually have slip ring devices installed in their mechanical arms to achieve free movement of the mechanical arms. The slip ring device consists of two major parts: a rotor and a stator. The slip ring needs to be filled with oil during use. Although the traditional sealing structure can ensure the sealing of the slip ring device, the traditional sealing structure has a large friction force and it is difficult to accurately control the torque of the rotating shaft. In addition, the fixed ring composed of two half rings cannot achieve a quick fixed connection between the two half rings, and the assembly is not convenient enough. Summary of the invention

[0004] The object of the present invention is to provide a low-friction pneumatic slip ring to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A low-friction pneumatic slip ring comprises a first fixed ring, an air inlet hole is provided on one side of the first fixed ring, oil inlet holes are symmetrically provided on the first fixed ring on both sides of the air inlet hole, a rotation-stopping socket is provided on the other side of the first fixed ring, first mounting slots and mounting inner slots are symmetrically provided at both ends of the first fixed ring, a ventilation slot is provided inside the first fixed ring, sealing ring slots are provided inside the first fixed ring at both ends of the ventilation slot, and bearings are installed in the mounting inner slots.

[0007] Preferably, a first half ring and a second half ring are symmetrically installed at both ends of the first fixed ring, and the first half ring and the second half ring at each end of the first fixed ring are closed together to form the second fixed ring, an oil filling hole is provided on the first half ring, and a fixed connecting block is fixedly arranged on the first half ring, and a fixed connecting channel is provided on the fixed connecting block.

[0008] Preferably, a bearing support plate is fixedly provided on the second half ring, a matching moving hole is provided on the bearing support plate, and a positioning matching plate is fixedly provided on the bearing support plate, a locking plug hole is provided on the positioning matching plate.

[0009] Preferably, a protruding sealing ring is fixedly provided at one end of the first half ring and the second half ring, and matching ring grooves are respectively provided inside the first half ring and the second half ring.

[0010] Preferably, a first moving ring is installed inside the second fixed ring, a matching sealing ring is fixedly provided on the outer end surface of the first moving ring, and a second installation groove is opened on the inner end surface of the first moving ring.

[0011] Preferably, the mating sealing ring is tightly fitted with the mating ring groove.

[0012] Preferably, a second moving ring is arranged on the outer side of the second fixed ring, and a plug-in ring groove is opened on the second moving ring, and the plug-in ring groove is tightly matched with the protruding sealing ring.

[0013] Preferably, a bearing movable block is installed on the second half ring, a mounting inner cavity is opened on the bearing movable block, a movable plug hole is opened in the mounting inner cavity, and a limiting movable rod is plugged in the movable plug hole.

[0014] Preferably, a connecting and matching spring is sleeved on the limiting movable rod, and an operating movable plate is fixedly provided on the limiting movable rod, and a portion of the operating movable plate is inserted into the installation inner cavity.

[0015] Preferably, a connecting mating rod is fixedly provided on the bearing movable block, the connecting mating rod is inserted in the mating movable hole, and a bearing connecting plate is fixedly provided on the end of the connecting mating rod away from the bearing movable block, an elastic mating connecting piece is fixedly provided on the bearing connecting plate, and a connecting fixed plug block is fixedly provided on the end of the bearing connecting plate away from the connecting mating rod.

[0016] Compared with the prior art, the invention has the following advantages:

[0017] 1. The first layer of sealing is achieved by arranging multiple sealing ring grooves inside the first fixed ring, the matching ring grooves on the first half ring and the second half ring are closely matched with the matching sealing ring on the first dynamic ring to achieve the second layer of sealing, and then the protruding sealing rings on the first half ring and the second half ring are matched with the plug-in ring grooves on the second dynamic ring to achieve the third layer of sealing. Through multi-stage sealing, pneumatic sealing in a rotating state is achieved with a non-contact structure, reducing the friction resistance caused by the traditional sealing structure, thereby achieving precise torque control of the rotating shaft.

[0018] 2. The first half ring and the second half ring are fixedly connected to form a second fixed ring. When the first half ring and the second half ring are fixedly connected, pull the operating movable plate and then push the bearing movable block to close the first half ring and the second half ring together. Release the bearing movable block to allow the connecting fixed plug block to be inserted into the fixed connection channel to achieve the fixed connection between the first half ring and the second half ring. The operation is simple, convenient and fast, and can greatly improve the work efficiency of assembling the two.

[0019] 3. In addition, when the first half ring and the second half ring are fixedly connected together, the limiting movable rod is inserted into the locking plug hole, so that the bearing movable block is in a fixed state, thereby ensuring that the connecting fixed plug block can be stably inserted into the fixed connection channel, ensuring the firmness and stability of the connection between the first half ring and the second half ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the first fixed ring assembly from the first perspective.

[0021] Figure 2 Schematic diagram of the second perspective of the first fixed ring assembly.

[0022] Figure 3 for Figure 1 A magnified schematic diagram of center A.

[0023] Figure 4 Exploded view of the first fixed ring assembly.

[0024] Figure 5 This is a schematic diagram of the half-section structure of the first fixed ring.

[0025] Figure 6 Schematic diagram of the first and second half rings assembled from a first perspective.

[0026] Figure 7 A schematic diagram showing the assembly of the first half ring and the second half ring from a second perspective.

[0027] Figure 8 It is a schematic diagram of the structure of the first moving ring.

[0028] Fig. 9 This is a schematic diagram of the structure of the second moving ring from the first perspective.

[0029] Fig.10 This is a schematic diagram of the structure of the second moving ring from a second perspective.

[0030] In the figure: 1. first fixed ring; 11. air inlet hole; 12. oil inlet hole; 13. anti-rotation plug hole; 14. first mounting slot; 15. mounting inner slot; 16. ventilation slot; 17. sealing ring slot; 2. bearing; 3. first half ring; 31. oil filling hole; 32. fixed connection block; 33. fixed connection channel; 4. second half ring; 41. load-bearing support plate; 42. matching movable hole; 43. positioning matching plate; 44. locking plug hole; 5. protruding sealing ring; 6. matching ring groove; 7. first moving ring; 71. matching sealing ring; 72. second mounting slot; 8. second moving ring; 81. plug-in ring groove; 9. load-bearing movable block; 91. mounting inner cavity; 92. movable plug hole; 93. limiting movable rod; 94. connecting matching spring; 95. operating movable plate; 96. connecting matching rod; 97. load-bearing connecting plate; 98. elastic matching connecting piece; 99. connecting fixed plug block. DETAILED DESCRIPTION

[0031] 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.

[0032] See also Figures 1 to 10 , the present invention provides a technical solution:

[0033] A low-friction pneumatic slip ring comprises a first fixed ring 1, an air inlet hole 11 is provided on one side of the first fixed ring 1, oil inlet holes 12 are symmetrically provided on the first fixed ring 1 on both sides of the air inlet hole 11, a rotation-stopping socket 13 is provided on the other side of the first fixed ring 1, first mounting grooves 14 and mounting inner grooves 15 are symmetrically provided at both ends of the first fixed ring 1, a ventilation groove 16 is provided inside the first fixed ring 1, sealing ring grooves 17 are provided inside the first fixed ring 1 at both ends of the ventilation groove 16, a first seal is formed by the setting of the sealing ring groove 17 and the rotating shaft, a bearing 2 is installed in the mounting inner groove 15, and the bearing 2 is a deep groove ball bearing with retaining rings on the left and right sides, and in addition, when assembling the first fixed ring 1, an O-ring is installed in the first mounting groove 14 to enhance the sealing performance.

[0034] The first half ring 3 and the second half ring 4 are symmetrically installed at both ends of the first fixed ring 1, and the first half ring 3 and the second half ring 4 at each end of the first fixed ring 1 are closed together to form a second fixed ring, an oil filling hole 31 is opened on the first half ring 3, and a fixed connecting block 32 is fixedly arranged on the first half ring 3, and a fixed connecting channel 33 is opened on the fixed connecting block 32.

[0035] A bearing support plate 41 is fixedly provided on the second half ring 4 , a matching moving hole 42 is provided on the bearing support plate 41 , and a positioning matching plate 43 is fixedly provided on the bearing support plate 41 , a locking plug hole 44 is provided on the positioning matching plate 43 .

[0036] A protruding sealing ring 5 is fixedly provided at one end of the first half ring 3 and the second half ring 4 , and a matching ring groove 6 is provided inside the first half ring 3 and the second half ring 4 , respectively.

[0037] The first moving ring 7 is installed inside the second fixed ring, and a matching sealing ring 71 is fixedly provided on the outer end face of the first moving ring 7. A second mounting groove 72 is opened on the inner end face of the first moving ring 7, and an O-ring is arranged in the second mounting groove 72 to enhance the sealing.

[0038] The matching sealing ring 71 is tightly matched with the matching ring groove 6. In addition, the second fixed ring is fixed to the first fixed ring 1 by screws, and the matching sealing ring 71 is tightly matched with the matching ring groove 6 to form a second seal.

[0039] A second moving ring 8 is arranged on the outer side of the second fixed ring. A plug-in ring groove 81 is opened on the second moving ring 8. The plug-in ring groove 81 is tightly matched with the protruding sealing ring 5, and the close match between the plug-in ring groove 81 and the protruding sealing ring 5 forms a third seal. In addition, the second moving ring 8 is tightly clamped on the rotating shaft with threads. At the same time, lubricating grease is added to both side surfaces of the deep groove ball bearing respectively, and filled into the bearing raceway and the first, second and third sealing gaps, thereby realizing a rotating oil film in the sealing gap.

[0040] A bearing movable block 9 is installed on the second half ring 4, and a mounting inner cavity 91 is opened on the bearing movable block 9. A movable plug hole 92 is opened in the mounting inner cavity 91. A limiting movable rod 93 is inserted in the movable plug hole 92, and the limiting movable rod 93 plays a fixing role on the bearing movable block 9 and is inserted in the locking plug hole 44.

[0041] A connecting spring 94 is sleeved on the limiting movable rod 93, and an operating movable plate 95 is fixedly set on the limiting movable rod 93. The operating movable plate 95 is partially inserted in the installation cavity 91, and the two ends of the connecting spring 94 are respectively welded to the operating movable plate 95 and the inner wall of the installation cavity 91.

[0042] A connecting fitting rod 96 is fixedly provided on the bearing movable block 9, and the connecting fitting rod 96 is inserted in the fitting movable hole 42, and a bearing connecting plate 97 is fixedly provided on the end of the connecting fitting rod 96 away from the bearing movable block 9, and an elastic fitting connecting piece 98 is fixedly provided on the bearing connecting plate 97, and the other end of the elastic fitting connecting piece 98 is fixed on the bearing support plate 41, and a connecting fixed plug-in block 99 is fixedly provided on the end of the bearing connecting plate 97 away from the connecting fitting rod 96. When the first half ring 3 and the second half ring 4 are fixedly connected, the connecting fixed plug-in block 99 is inserted in the fixed connection channel 33.

[0043] When the first half ring 3 and the second half ring 4 are fixedly connected, the operating movable plate 95 is pulled in a direction away from the positioning matching plate 43 so that the limiting movable rod 93 exits the locking plug hole 44, so that the bearing movable block 9 is in an active state, and then the two bearing movable blocks 9 on the second half ring 4 are pushed toward each other at the same time to move away from the bearing support plate 41, and then the first half ring 3 and the second half ring 4 can be closed together, and then the bearing movable blocks 9 are released one by one, so that the bearing movable blocks 9 are driven to reset under the action of the elastic matching connecting piece 98, and the connection fixed plug block 99 is aligned with the fixed connection channel 33 at this time, so that the connection fixed plug block 99 will also be driven as the bearing movable block 9 is reset Plug into the fixed connection channel 33 to realize the fixed connection between the first half ring 3 and the second half ring 4. In addition, during the resetting process of the supporting movable block 9, the limiting movable rod 93 is in contact with the end face of the positioning matching plate 43. At this time, the connecting matching spring 94 is in a compressed state. Therefore, when the supporting movable block 9 is fully reset, the limiting movable rod 93 is aligned with the locking plug hole 44. In this way, under the action of the connecting matching spring 94, the limiting movable rod 93 will be plugged into the locking plug hole 44, and then under the action of the limiting movable rod 93, the supporting movable block 9 is fixed, thereby ensuring the firmness and stability of the connection between the first half ring 3 and the second half ring 4. It is very convenient, fast and easy to operate.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-friction pneumatic slip ring, comprising a first fixed ring (1), characterized in that: An air inlet hole (11) is provided on one side of the first fixed ring (1), oil inlet holes (12) are symmetrically provided on the first fixed ring (1) on both sides of the air inlet hole (11), a rotation-stopping plug hole (13) is provided on the other side of the first fixed ring (1), and first mounting grooves (14) and mounting inner grooves (15) are symmetrically provided at both ends of the first fixed ring (1), and a ventilation groove (16) is provided inside the first fixed ring (1), and sealing ring grooves (16) are provided inside the first fixed ring (1) at both ends of the ventilation groove (16). 17), a bearing (2) is installed in the installation inner groove (15), a first half ring (3) and a second half ring (4) are symmetrically installed at both ends of the first fixed ring (1), and the first half ring (3) and the second half ring (4) at each end of the first fixed ring (1) are closed together to form a second fixed ring, an oil injection hole (31) is opened on the first half ring (3), and a fixed connection block (32) is fixedly arranged on the first half ring (3), and a fixed connection channel (33) is opened on the fixed connection block (32), and the A bearing support plate (41) is fixedly arranged on the second half ring (4), a matching moving hole (42) is provided on the bearing support plate (41), and a positioning matching plate (43) is fixedly arranged on the bearing support plate (41), and a locking plug hole (44) is provided on the positioning matching plate (43). A protruding sealing ring (5) is fixedly arranged on one end of each of the first half ring (3) and the second half ring (4), and matching ring grooves (6) are provided inside the first half ring (3) and the second half ring (4), respectively. A first moving ring (7) is installed inside the second fixed ring, a matching sealing ring (71) is fixedly arranged on the outer end surface of the first moving ring (7), and a second mounting groove (72) is provided on the inner end surface of the first moving ring (7), and the matching sealing ring (71) is tightly matched with the matching ring groove (6). A second moving ring (8) is arranged on the outer side of the second fixed ring, and a plug-in ring groove (81) is provided on the second moving ring (8), and the plug-in ring groove (81) is tightly matched with the protruding sealing ring (5).

2. A low friction pneumatic slip ring according to claim 1, characterized in that: The second half ring (4) is provided with a bearing movable block (9), the bearing movable block (9) is provided with a mounting inner cavity (91), the mounting inner cavity (91) is provided with a movable plug hole (92), and a limiting movable rod (93) is plugged into the movable plug hole (92).

3. A low friction pneumatic slip ring according to claim 2, characterized in that: A connecting matching spring (94) is sleeved on the limiting movable rod (93), and an operating movable plate (95) is fixedly provided on the limiting movable rod (93), wherein a portion of the operating movable plate (95) is inserted into the installation inner cavity (91).

4. A low friction pneumatic slip ring according to claim 3, characterized in that: A connecting fitting rod (96) is fixedly provided on the bearing movable block (9), the connecting fitting rod (96) is inserted into the fitting movable hole (42), and a bearing connecting plate (97) is fixedly provided on the end of the connecting fitting rod (96) away from the bearing movable block (9), an elastic fitting connecting piece (98) is fixedly provided on the bearing connecting plate (97), and a connecting fixed plug block (99) is fixedly provided on the end of the bearing connecting plate (97) away from the connecting fitting rod (96).

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