An integrated mandrel and a rotary transmission device with an integrated mandrel

Abstract

This invention relates to an integrated mandrel and a rotary transmission device with an integrated mandrel, belonging to the field of conductive slip ring technology. It solves the technical problem that the quality of electric slip rings is heavily dependent on the precision of machining and assembly processes, and that the transmission lines on the conductive ring are easily damaged, leading to reduced transmission quality. The integrated mandrel of this invention includes a mandrel base, pads, conductive pins, and transmission lines. Multiple sets of axial outlet holes, pin holes, and pads are evenly distributed circumferentially on one end face of the mandrel base. Multiple V-grooves are evenly distributed axially on the mandrel base, and each V-groove has a radial outlet hole at its bottom. The transmission line is disposed within the mandrel base, with both ends connected to the axial and radial outlet holes. The rotary transmission device with an integrated mandrel of this invention includes an integrated mandrel, a quick-connect body, a brush unit, a fixing frame unit, a mandrel connecting ring, and an external wire-connected connector. The integrated mandrel of this invention has a simple structure and can be flexibly customized; the rotary transmission device has good transmission performance.

Description

Technical Field

[0001] This invention relates to the field of conductive slip ring technology, and more particularly to an integrated mandrel and a rotary transmission device with an integrated mandrel. Background Technology

[0002] A slip ring is an electrical component responsible for connecting and transmitting energy and signals to a rotating body. It mainly consists of two parts: a rotating part and a stationary part. An electric slip ring is a slip ring used to conduct electricity, specifically designed to transmit power and signal power during unrestricted continuous rotation. Traditional electric slip rings are also called "collector rings" or "conductor rings." They primarily transmit large currents. In recent years, precision electric slip rings have emerged, becoming precision electronic and electrical equipment used in both military and civilian applications.

[0003] Regardless of the type, most slip rings are designed and assembled using a stacking method. Specifically, the inner layer of the slip ring's mandrel is a shaft, and the outer layer is an insulating sleeve. Conductive rings and insulating sheets are then stacked around the insulating sleeve. There are many types and quantities of mandrel parts on the market, resulting in long manufacturing cycles and high costs. Furthermore, the precision of the stacked assembly process is difficult to control, leading to poor axial installation accuracy of the conductive rings and insulating sheets. This also makes the slip rings prone to twisting, crushing, and breakage during installation and operation, potentially causing faults in related transmission lines.

[0004] Therefore, overcoming the structural dependence of the quality of electric slip rings on the precision of manufacturing and assembly processes is a major challenge. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide an integrated mandrel and a rotary transmission device with an integrated mandrel, in order to solve the technical problems of slip ring mandrel having many types and numbers of parts, complex manufacturing and assembly processes, and the quality of electric slip rings being heavily dependent on the precision of manufacturing and assembly processes, as well as the technical problems of transmission failures caused by twisting, extrusion, and breakage of the electric slip ring mandrel rotary transmission cable.

[0006] This invention is achieved through the following technical solution:

[0007] An integrated mandrel includes a mandrel base, pads, conductive pins, and a mandrel transmission line. The mandrel base has a central hole and multiple V-grooves evenly distributed along the axial direction on its outer surface. A V-groove ring metal layer is formed on the surface of each V-groove, and a radial exit hole is formed at the bottom of each V-groove. A first shaft platform and a second shaft platform are respectively provided at both ends of the mandrel base. Multiple axial connection units are arranged circumferentially on the shaft ends of the first shaft platform. Pads are provided on the axial connection units, and the conductive pins are connected to the pads. Within the central hole of the mandrel, one end of the mandrel transmission line passes through the radial exit hole to connect to the V-groove ring metal layer, and the other end of the mandrel transmission line passes through the axial connection unit to connect to the pad.

[0008] Furthermore, the axial connection unit includes an axial outlet hole, a pin hole, and a pad countersunk groove.

[0009] Furthermore, the axial outlet hole is a through hole, and the pin hole is a blind hole; the pad is set in the pad countersunk groove.

[0010] Furthermore, an insulating boss is provided between every two layers of the V-groove ring metal layer, and the diameter of the radial outlet hole is smaller than the width of the V-groove.

[0011] Furthermore, the plurality of radial outlet holes are equally spaced along the axial direction of the mandrel base and evenly distributed along the circumferential direction of the mandrel base; the radial outlet holes are in communication with the central hole of the mandrel.

[0012] A rotary transmission device with an integrated mandrel includes the integrated mandrel, as well as a brush unit and a fixing frame unit; two brush units are symmetrically arranged inside the fixing frame unit to form a rotary transmission outer frame; the rotary transmission outer frame and the mandrel base (80) are coaxially arranged, and the mandrel base is rotatably connected to the rotary transmission outer frame through two bearings; the brush unit includes multiple sets of brush filaments; each set of brush filaments is in contact with the V-groove metal layer plating, and the brush filaments are connected to the conductive pin through the mandrel transmission line.

[0013] Furthermore, the fixing unit includes a fixing ring and a housing coaxially connected; the fixing ring is connected to the brush unit.

[0014] Furthermore, the brush unit also includes a brush holder and a brush plate; the upper end of the brush holder is connected to the fixing ring, the brush plate is connected to the outer side of the brush holder, the middle of each brush bristle is disposed on the brush plate, and both ends pass through the sides of the brush holder and abut against the V-groove metal layer plating; a plurality of brush bristles are evenly distributed on the brush plate along the axial direction of the spindle base.

[0015] Furthermore, the rotary transmission device with an integrated mandrel also includes a mandrel connecting ring, an external wire connector, and a quick-connect body; the quick-connect body is connected to the upper surface of the first shaft platform of the mandrel base through the mandrel connecting ring; a dynamic sealing ring is provided between the fixing frame unit and the mandrel connecting ring; the external wire connector is connected to the brush unit.

[0016] A rotary transmission device with an integrated mandrel, wherein the transmission line end of the external wire-connected plug is connected to the brush bristles at the brush plate; and further includes a sealant for sealing the connection between the external wire-connected plug and the housing.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0018] 1. The integrated mandrel and rotary transmission device of the present invention, due to the integrated mandrel, eliminates the need for traditional slip ring components such as conductive metal rings and insulating sheets. This significantly reduces the types and number of parts. The integrated processing method using V-grooves and insulating bosses replaces the traditional stacking process of conductive rings and insulating sheets, simplifying the overall processing of the integrated mandrel and greatly simplifying the assembly process. The integrated mandrel structure is simple and highly reliable.

[0019] 2. The integrated mandrel and rotary transmission device of the present invention, due to the adoption of dynamic sealing structure and sealant bottom sealing technology, can achieve high waterproof effect and quickly achieve overall sealing of the rotary transmission device, thereby effectively improving the sealing effect of the mandrel.

[0020] 3. The integrated mandrel and rotary transmission device of the present invention have various connection forms. Different lines can be connected by selecting quick-connect bodies with different connectors and external wired connectors, which is convenient and quick.

[0021] 4. This invention can flexibly customize integrated mandrels with different transmission channels by designing different numbers of radial outlet holes, axial outlet holes and V-grooves, effectively shortening the design and serial manufacturing cycle of slip rings and providing strong flexibility for product optimization; a single part can be quickly processed into the mandrel of the slip ring according to different ring diameters, number of rings, ring groove widths, etc., which greatly improves the design, manufacturing and efficiency of the mandrel.

[0022] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0023] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0024] Figure 1 This is a schematic diagram of the split-section structure of the integrated mandrel of the present invention;

[0025] Figure 2 This is a schematic diagram of the integrated mandrel structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the split-section structure of the integrated mandrel of the present invention;

[0027] Figure 4 This is a schematic diagram of the integrated mandrel structure from an axial top view of the present invention;

[0028] Figure 5 This is a schematic diagram of the brush unit mounting structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the faceted cross-section structure in the rotary transmission device with an integrated mandrel of the present invention;

[0030] Figure 7 This is a schematic diagram of the split-section structure of the rotary transmission device with an integrated mandrel of the present invention.

[0031] Figure 8 for Figure 3 A magnified view of part A in the diagram;

[0032] Figure 9 for Figure 3 A magnified view of part B in the diagram.

[0033] Figure label:

[0034] 1. Quick-connect body; 2. Mandrel connecting ring; 3. Dynamic sealing ring; 4. Fixing ring; 5. Brush holder; 6. Brush plate; 7. Brush bristles; 8. Integrated mandrel; 80. Mandrel base; 801. First shaft platform; 802. Insulating boss; 803. V-groove ring metal layer; 804. V-groove; 805. Axial cable outlet hole; 806. Radial cable outlet hole; 807. Pin hole; 808. Mandrel connecting hole; 809. Mandrel center hole; 810. Pad countersunk groove; 81. Pad; 82. Conductive pin; 83. Mandrel transmission line; 9. Housing; 10. External cable connector; 11. Bearing; 12. External transmission line; 13. Sealant; 100. Rotary transmission device. Detailed Implementation

[0035] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0036] The following is combined Figures 1-9 The technical solution of the present invention will be described in more detail below:

[0037] like Figure 1As shown, a specific embodiment of the present invention discloses an integrated mandrel and a rotary transmission device with an integrated mandrel. The rotary transmission device comprises a quick-connect body 1, a mandrel connecting ring 2, a dynamic sealing ring 3, a fixing ring 4, a brush holder 5, a brush plate 6, brush filaments 7, an integrated mandrel 8, a housing 9, and an external wire-connected connector 10. The integrated mandrel 8 mainly includes a mandrel base 80, solder pads 81, conductive pins 82, and a mandrel transmission line 83; wherein, the mandrel base 80 is a hollow shaft with shaft platforms at both ends, and the mandrel base 80 is provided with a radial wire outlet hole 806, a V-groove 804, a V-groove ring metal layer 803, an insulating boss 802, a first shaft platform 801, a second shaft platform, an axial wire outlet hole 805, a pin hole 807, and solder pads 81.

[0038] The mandrel base 80 is made of non-metallic material and has good insulation properties. Specifically, the mandrel base 80 is a stepped shaft with a central hole 809 containing stepped bores. Multiple sets of axial connection units are arranged on the shaft end at the first shaft platform 801 of the mandrel base 80; these axial connection units are circumferentially arrayed on the shaft end. Conductive pins 82 connect to the pads 81. The mandrel transmission line 83 is located within the central hole 809. One end of the mandrel transmission line 83 passes through a radial outlet hole 806 and communicates with the V-groove ring metal layer 803, allowing for electrical connection to the external wire-connected connector 10 via the brush 7. The other end of the mandrel transmission line 83 passes through an axial connection unit and connects to the pad 81, allowing for electrical connection to the quick-connect connector 1.

[0039] Each axial connection unit includes an axial outlet hole 805, a pin hole 807, and a pad countersunk groove 810. The axial outlet hole 805 and the pin hole 807 are radially arranged and located within the same group's pad countersunk groove 810. The axial outlet hole 805 is a through hole, connecting to the mandrel center hole 809, and is a blind hole. The pad 81 has a through hole corresponding to the axial outlet hole 805 and the pin hole 807, and the pad 81 is located within the pad countersunk groove 810.

[0040] In this embodiment, the spindle transmission line 83 preferably passes through the axial outlet hole 805 and is soldered into the hole corresponding to the pad 81; preferably, the conductive pin 82 is inserted into the pin hole 807 and passes through the hole corresponding to the pad 81 to cooperate with the quick-connect interface on the quick-connect body 1 to realize the axial / hole type quick plug-in connection.

[0041] Specifically, such as Figure 3 As shown, the mandrel base 80 has a stepped shaft structure, with a first shaft platform 801 and a second shaft platform of smaller diameter at both ends. The mandrel base 80 has a central hole, which can be a through stepped central hole adapted to the outer wall structure, i.e., a larger diameter annular groove corresponding to the larger shaft diameter in the middle, or a stepped hole with a blind end that is closed at the second shaft platform end. In this embodiment, a through stepped hole is preferred for structural description.

[0042] like Figure 4 As shown, the upper end face of the first shaft platform 801 of the mandrel base 80 is provided with an axial cable outlet hole 805 and a pin hole 807, which are arranged on the same radius line, with the pin hole 807 inside and the axial cable outlet hole 805 outside. A pad 81 is also installed inside the pin hole 807 and at the axial cable outlet hole 805. The pad 81 has two through holes, corresponding to the pin hole 807 and the axial cable outlet hole 805. The axial cable outlet hole 805 is a through hole, penetrating the annular groove inside the mandrel base 80; the pin hole 807 is a blind hole, in which a conductive pin 82 is installed. The upper end face of the first shaft platform 801 of the mandrel base 80 is also provided with evenly distributed mandrel connection holes 808.

[0043] Pin holes 807, axial outlet holes 805, pads 81 and conductive pins 82 arranged in the same radial direction are grouped together, and multiple groups of pin holes 807, axial outlet holes 805, pads 81 and conductive pins 82 are arranged in a circumferential array on the first shaft platform 801 of the mandrel base 80.

[0044] like Figure 1 , Figure 2 and Figure 3 As shown, the outer surface of the 80-step mandrel base has N (a natural number greater than 1, generally a multiple of 10) V-grooves 804 arranged parallel to each other along the axial direction, forming a mandrel annular channel in which the brush bristles 7 can slide. (See attached image) Figures 1-4 The V-groove 804 shown all have a value of N=30.

[0045] like Figure 9 As shown, the surface of the V-groove 804 can be modified and metallized through various methods such as laser cladding, spraying conductive ink, and electroplating to form a V-groove ring metal layer 803. A noble metal layer is then plated onto the surface of the V-groove ring metal layer 803 through electroplating or chemical plating to increase the wear resistance of the mandrel ring surface formed by the V-groove 804 and increase the service life of the mandrel base 80. An insulating boss 802 is provided between the two V-groove ring metal layers 803. This serves two purposes: firstly, it provides good insulation and pressure resistance between the mandrel slides formed by the different V-groove 804 layers; secondly, it provides good mechanical guidance for the brush bristles 7, preventing them from jumping between the V-groove ring metal layers 803. The mandrel base material should have good electrical properties and high mechanical strength to meet the requirements for the use of the slip ring mandrel.

[0046] like Figure 8As shown, each V-groove 804 has a corresponding radial outlet hole 806 at its bottom, which communicates with the annular groove inside the spindle base 80. The diameter of the radial outlet hole 806 is smaller than the width of the V-groove 804. This structure effectively ensures the insulation between adjacent V-grooves 804 (transmission channels) while meeting transmission requirements. If the diameter of the radial outlet hole 806 is larger than the width of the V-groove, the insulation thickness of the insulating boss 802 will be reduced, or even damaged, affecting the insulation of adjacent V-grooves 804. Moreover, given a fixed wire diameter of the transmission line 83, an excessively large diameter of the radial outlet hole 806 is not beneficial for the installation of the transmission line 83 and may even affect the positional stability of the transmission line 83.

[0047] The projection lines of the radial outlet holes 806 at the bottom of each V-groove 804 on the cross-section of the mandrel base 80 are evenly distributed around the entire circumference and arranged sequentially. All radial outlet holes 806 are evenly distributed along the spiral lines set on the cylindrical surface of the mandrel base 80, and are evenly distributed along the spiral lines of one pitch.

[0048] The spindle transmission line 83 is disposed within the spindle base 80, and both ends of the spindle transmission line 83 are connected to an axial outlet hole 805 and a radial outlet hole 806. Specifically, one end of the spindle transmission line 83 passes through the radial outlet hole 806 and communicates with the V-groove ring metal layer 803, and the other end of the spindle transmission line 83 passes through the axial outlet hole 805 and mates with the pad 81, the pin hole 807 and the conductive pin 82 to form an electrical connection.

[0049] The integrated spindle and rotary transmission device includes the aforementioned integrated spindle 8, as well as a quick-connect body 1, a brush unit, a fixing frame unit, a spindle connecting ring 2, and an external cable-connected connector 10. Different line transmissions can be achieved by selecting quick-connect bodies 1 and external cable-connected connectors 10 with different connectors to connect to the same integrated spindle.

[0050] Two brush units are coaxially connected inside the fixed frame unit to form a rotating transmission outer frame; the rotating transmission outer frame and the spindle base 80 are movably connected by two bearings 11; the spindle connecting ring 2 is connected to the upper end face of the first shaft platform 801, the quick-connect body 1 is connected to the spindle connecting ring 2, and the socket / plug of the quick-connect body 1 is correspondingly connected to the conductive pin 82, which can realize shaft-type / hole-type quick plug-in connection.

[0051] The transmission line of the external wire connector 10 is an external transmission line 12; the external transmission line 12 is connected to the brush unit; the outer shell outlet between the external wire connector 10 and the outer shell 9 is sealed with sealant 13.

[0052] The mandrel connecting ring 2 is connected and fixed to the mandrel base 80 by screws. A dynamic sealing ring 3 is provided between the fixing frame unit and the mandrel connecting ring 2. The dynamic sealing ring 3 is fitted between the inner side of the upper shaft platform of the inner ring stepped shaft platform of the fixing ring 4 and the outer cylindrical surface of the mandrel connecting ring 2, which enables the mandrel connecting ring 2 and the fixing ring 4 to achieve a dynamic sealing effect. In addition, the outer shell outlet is filled with sealant 13, which can make the interior of the outer shell 9, which includes the integrated mandrel 6, brush unit and fixing frame unit, form an overall seal, realizing the efficient waterproof effect of the integrated mandrel and rotary transmission device.

[0053] Specifically, such as Figure 6 As shown, the mounting unit includes a mounting ring 4 and a housing 9. The housing 9 is a sleeve-type rotating body, and its upper end is coaxially connected to the mounting ring 4 for a fixed connection. The bottom of the housing 9 is provided with a housing outlet for the external transmission line 12 from the brush unit to pass through. The external transmission line 12 is connected to the brush filaments 7 of the brush unit inside the housing 9. The external transmission line 12 is the transmission line in the external wire-connected insert 10.

[0054] Specifically, such as Figure 5 and Figure 6 As shown, the brush unit includes a brush holder 5, a brush plate 6, and brush bristles 7.

[0055] Furthermore, the brush plate 6 is symmetrically mounted on the outer side of the brush holder 5, and the brush bristles 7 are evenly distributed along the axial direction of the spindle base 80 on the brush plate 6; the brush bristles 7 pass through the brush holder 5 and contact the metal plating layer of the V-groove (804), and the brush bristles 7 correspond one-to-one with the V-groove 804 on the integrated spindle 8. The external transmission line 12 connects to the brush bristles 7 at the brush plate 6.

[0056] The socket / plug corresponding to the conductive pin 82 rotates relative to the socket / plug corresponding to the brush filament 7, thereby realizing the rotational transmission of current between the upper and lower sockets / plugs.

[0057] Furthermore, two brush units are symmetrically arranged between the housing 9 and the integrated spindle 8, located in the radial position of the integrated spindle 8. Specifically, two brush holders 5 are symmetrically arranged radially on the outer ring of the spindle base 80, with the upper end of the brush holder 5 connected to the lower end face of the fixing ring 4, and the lower end of the brush holder 5 provided with a brush holder bending plate.

[0058] The brush holder 5, the fixing ring 4, and the outer shell 9 together constitute the main body of the rotating transmission frame. The rotating transmission frame and the integrated spindle 8 form a rotating pair through two bearings 11.

[0059] Specifically, the inner rings of the upper and lower bearings 11 are respectively set on the first shaft platform 801 and the second shaft platform of the spindle base 80; the outer ring of the upper bearing 11 is limited on the inner surface of the brush holder 5 and is pressed by the lower shaft platform of the stepped shaft platform of the inner ring of the fixing ring 4; the outer ring of the lower bearing 11 is limited and pressed by the inner surface of the brush holder 5 and the brush holder bending plate.

[0060] Each V-groove ring metal layer 803 in the spindle base 80 corresponds to a conductive pin / conductive socket through the spindle transmission line 83. The two shaft ends of the spindle base 80 are engaged with the inner ring of the bearing 11, so that the V-groove ring metal layer 803 can maintain relative rotational contact with the brush filaments 7 that are relatively fixed to the outer ring of the bearing 11 in the rotational transmission device, thereby realizing the rotational transmission of current between the brush filaments 7 of the brush plate 6 and the conductive pins 82 of the integrated spindle 8.

[0061] like Figure 7 As shown, the spindle base 80 of the integrated spindle 8 has spindle connecting holes 808 evenly arranged on the end face of the first shaft platform 801. The spindle connecting holes 808 are connected to the spindle connecting ring 2 in the rotary transmission device in the form of threaded holes, so as to realize synchronous movement with the external interface.

[0062] This invention allows for flexible customization of integrated mandrels with different transmission channels by selecting different numbers of radial outlet holes, axial outlet holes, and V-grooves, as well as different annular diameters and annular groove widths. This effectively shortens the design and serial manufacturing cycle and provides strong flexibility for product optimization, greatly improving the design, manufacturing, and efficiency of the mandrel.

[0063] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Furthermore, any equipment equipped with this device to expand its application field and produce combined technical effects falls within the scope of protection of this invention.

Claims

1. An integrated mandrel, characterized in that, It includes a spindle base (80), pads (81), conductive pins (82), and spindle transmission lines (83); The mandrel base (80) is a stepped shaft with a stepped hole (809) inside and multiple V-grooves (804) evenly distributed along the axial direction on the outer surface. A V-groove ring metal layer (803) is provided on the surface of the V-groove (804), and an insulating boss (802) is provided between every two layers of the V-groove ring metal layer (803). Each of the V-grooves (804) has a radial outlet hole (806) at its bottom. The diameter of the radial outlet hole (806) is smaller than the width of the V-groove (804). Multiple radial outlet holes (806) are evenly spaced along the axial direction of the mandrel base (80) and are evenly distributed along the circumferential direction of the mandrel base (80). The radial outlet holes (806) communicate with the stepped holes (809). The mandrel base (80) is provided with a first shaft platform (801) and a second shaft platform at both ends respectively; the first shaft platform (801) has a plurality of axial connecting units arranged circumferentially at the shaft end, the axial connecting unit includes an axial outlet hole (805) and a pin hole (807), the two are arranged on the same radius line, the pin hole (807) is inside and the axial outlet hole (805) is outside, the pin hole (807) is a blind hole and the axial outlet hole (805) is a through hole; The axial connection unit is provided with a pad (81), and the pad (81) is provided with two through holes, corresponding to the pin hole (807) and the axial outlet hole (805). The axial connection unit also includes a pad countersunk groove (810). The pad (81) is disposed in the pad countersunk groove (810), and the conductive pin (82) is connected to the pad (81). Within the stepped hole (809), one end of the mandrel transmission line (83) passes through the radial outlet hole (806) to connect to the V-groove annular metal layer (803), and the other end of the mandrel transmission line (83) passes through the axial connection unit to connect to the pad (81).

2. A rotary transmission device with an integrated mandrel, characterized in that, The device includes the integrated mandrel (8) as described in claim 1, and also includes a brush unit and a fixing frame unit; two brush units are symmetrically arranged inside the fixing frame unit to form a rotating transmission outer frame; the rotating transmission outer frame and the mandrel base (80) are coaxially arranged, and the mandrel base (80) is rotatably connected to the rotating transmission outer frame through two bearings (11); The brush unit includes multiple sets of brush filaments (7); each set of brush filaments (7) is in contact with the metal layer plating of the V-groove (804), and the brush filaments (7) are connected to the conductive pins (82) through the spindle transmission line (83).

3. The rotary transmission device with an integrated mandrel according to claim 2, characterized in that, The fixing unit includes a fixing ring (4) and a housing (9) connected coaxially; the fixing ring (4) is connected to the brush unit.

4. The rotary transmission device with an integrated mandrel according to claim 3, characterized in that, The brush unit also includes a brush holder (5) and a brush plate (6); the upper end of the brush holder (5) is connected to the fixing ring (4), the brush plate (6) is connected to the outer side of the brush holder (5), each brush bristle (7) is disposed in the middle on the brush plate (6), and both ends pass through the two sides of the brush holder (5) and contact the metal layer plating of the V-groove (804); a plurality of brush bristles (7) are evenly distributed on the brush plate (6) along the axial direction of the spindle base (80).

5. The rotary transmission device with an integrated mandrel according to claim 4, characterized in that, It also includes a spindle connecting ring (2), an external wire-connected plug (10), and a quick-connect body (1); The quick-connect body (1) is connected to the upper end face of the first shaft platform (801) of the mandrel base (80) via the mandrel connecting ring (2); a dynamic sealing ring (3) is provided between the fixing frame unit and the mandrel connecting ring (2); the external wire-connected plug (10) is connected to the brush unit.

6. The rotary transmission device with an integrated mandrel according to claim 5, characterized in that, The transmission line end of the external cable connector (10) is connected to the brush bristles (7) at the brush plate (6); it also includes a sealant (13) for sealing the connection between the external cable connector (10) and the outer shell (9).

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