Robot joint electric connector

Abstract

The utility model discloses a robot joint electric connector, which comprises a rotary connecting assembly and an electric contact assembly, the rotary connecting assembly comprises a first connecting piece and a second connecting piece which rotate relatively, the first connecting piece is connected with a fixed end of a robot, and the second connecting piece is fixed with a moving arm of the robot; the electric contact assembly is arranged on the relative rotating surface of the rotary connecting assembly and comprises at least one group of elastic contact pieces and multiple circles of annular electrodes which are coaxially arranged and have different diameters, the annular electrodes are fixedly connected with the first connecting piece, and the elastic contact pieces are fixedly connected with the second connecting piece; the elastic contact pieces elastically abut against the corresponding annular electrodes to achieve continuous electric connection in the rotating process. According to the utility model, the annular electrode and the elastic contact piece are integrated through the PCB capable of rotating relatively, so that the problem of frequent bending, fatigue and fracture of the wire harness is avoided, local abrasion is reduced, the structure is simplified, maintenance is facilitated, the diameter of a joint shaft is reduced, and miniaturization and lightweight design of a robot is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to antenna equipment technical field especially relates to a robot joint electric connector. BACKGROUND

[0002] In the robot joint design, the reliability of electrical connection directly affects the motion life and maintenance cost of the whole machine. In the prior art, the robot joint generally adopts the connection mode that the flexible wire harness passes through the hollow joint shaft, and the typical structure is as follows: a plurality of copper core cables are wrapped with a flexible insulation layer, one end is fixed to the base, the other end rotates with the moving arm, and signal and power transmission are realized through the via hole in the center of the joint shaft.

[0003] However, the wire harness is repeatedly bent during joint movement in the traditional wire harness connection mode, which causes cumulative plastic deformation of the conductor and cracking of the insulation layer, and electrical failure is easily caused after a long time. In addition, maintenance is difficult, because the connector is not integrated at the joint but located inside the mechanical arm, and when replaced, the complex mechanical structure needs to be disassembled, which increases the maintenance time and cost. In addition, due to the structural limitation, in order to accommodate the wire harness, the joint transmission shaft diameter often needs to be designed as hollow to reserve the installation space of the cable, which not only affects the mechanical strength of the transmission shaft, but also seriously limits the miniaturization design of the robot. UTILITY MODEL CONTENT

[0004] The utility model aims at providing an elastic contact piece type robot joint electric connector suitable for high frequency rotation scene to solve the shortage of prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A robot joint electric connector, comprising a rotating connection assembly and an electric contact assembly, wherein the rotating connection assembly comprises a first connecting piece and a second connecting piece that rotate relative to each other, the first connecting piece is connected with the fixed end of the robot, and the second connecting piece is fixed with the moving arm of the robot. The electric contact assembly is arranged on the relative rotation surface of the rotating connection assembly and comprises at least one group of elastic contact pieces and a plurality of coaxially arranged annular electrodes with different diameters. The annular electrodes are fixedly connected with the first connecting piece, the elastic contact pieces are fixedly connected with the second connecting piece, and the elastic contact pieces elastically abut on the corresponding annular electrodes to realize continuous electrical connection during rotation.

[0007] Further, the first connecting piece and the second connecting piece are both made of printed circuit boards.

[0008] Further, the elastic contact pieces are two groups, which are centrally symmetrically distributed and are fixed to the second connecting piece by surface mounting process welding.

[0009] Further, each group of elastic contact pieces comprises a plastic holder, a plurality of signal contact pieces and a plurality of power contact pieces which are sequentially and spacedly arranged on the plastic holder along the length direction of the plastic holder.

[0010] Further, the elastic contact piece is a sheet structure with elastic deformation capability, is made of conductive elastic material, and adopts an arc-shaped transition design for the contact part.

[0011] Further, a fixed shell is further included, the fixed shell is wrapped on the outside of the first connecting piece, and is used for providing mechanical protection and dustproof sealing.

[0012] Further, the first connecting piece and the second connecting piece are provided with a through hole for a power output shaft to pass through, the power output shaft is coaxially arranged with the rotary connecting assembly, and the diameter of the through hole is greater than the diameter of the power output shaft to avoid mechanical interference.

[0013] Compared with the prior art, the robot joint electric connector has the following beneficial technical effects:

[0014] 1. Reliability and service life are improved: by canceling the traditional wire harness connection, conductor breakage caused by bending fatigue is avoided; the surface contact design of the elastic contact piece makes the contact pressure uniform, reduces local wear, and further prolongs the service life;

[0015] 2. Structure simplification and integration: compared with the through hole design of the traditional wire harness, the present application utilizes two relatively rotatable PCB boards to integrate the annular electrode and the elastic contact piece, which is beneficial to maintenance and maintenance, and can also reduce the diameter of the joint shaft, which is beneficial to the miniaturization and lightweight design of the robot. BRIEF DESCRIPTION OF DRAWINGS

[0016] The following description of the drawings is merely some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings. In the drawings:

[0017] Figure 1 The overall structure schematic diagram of a robot joint electric connector provided by the embodiment of the present application is shown in the figure;

[0018] Figure 2 The cross-sectional view of a robot joint electric connector provided by the embodiment of the present application is shown in the figure;

[0019] Figure 3 The exploded view of a robot joint electric connector provided by the embodiment of the present application is shown in the figure;

[0020] Figure 4 The matching relationship schematic diagram of the elastic contact piece and the annular electrode in a robot joint electric connector provided by the embodiment of the present application is shown in the figure;

[0021] Figure 5 A schematic diagram of the installation relationship between a first connector and a ring electrode in a robot joint electrical connector provided by an embodiment of the present utility model;

[0022] Figure 6 A schematic diagram of the installation relationship between the second connecting member and the elastic contact piece in a robot joint electrical connector provided by an embodiment of the present utility model;

[0023] Figure 7 This is a schematic structural diagram of an elastic contact piece in a robot joint electrical connector provided by an embodiment of the present utility model.

[0024] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0025] 1-first connecting piece, 11-positioning slot, 2-second connecting piece, 21-fixing hole, 3-through hole, 4-ring electrode, 5-elastic contact, 51-signal contact, 511-main body, 512-welding foot, 513-contact part, 52-power contact, 53-plastic retaining piece, 6-fixing shell, 61-positioning protrusion, 7-power output shaft. DETAILED DESCRIPTION

[0026] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0027] like Figures 1 to 7 As shown, the embodiment of the present invention provides a robot joint electrical connector, including a rotary connection component, an electrical contact component and a fixed shell 6. The specific structure and assembly relationship of each component are as follows:

[0028] The rotating connection assembly comprises a first connecting piece 1 and a second connecting piece 2, both of which are made of printed circuit boards (PCB boards), which can support the installation of the electrical contact assembly and integrate electrical wiring through the PCB boards, thereby simplifying the signal transmission path and reducing the assembly process. The first connecting piece 1 is connected to the fixed end of the robot, and the outer edge of the first connecting piece 1 is provided with a positioning clamping groove 11. Correspondingly, the edge of the bottom plate of the fixed shell 6 is provided with a positioning protrusion 61 matched with the positioning clamping groove 11. The fixed shell 6 is wrapped outside the first connecting piece 1 to provide mechanical protection and dustproof sealing. The second connecting piece 2 is provided with a fixing hole 21, which is fixed to the moving arm of the robot through a bolt. The first connecting piece 1 and the second connecting piece 2 are provided with a via hole 3 through which a power output shaft 7 of a motor passes. The power output shaft 7 is coaxially arranged with the rotating connection assembly. The diameter of the via hole 3 is greater than that of the power output shaft 7 to avoid mechanical interference. The first connecting piece 1 and the second connecting piece 2 are arranged in parallel and can rotate relative to the power output shaft 7.

[0029] The electrical contact assembly comprises two groups of elastic contact pieces 5 and a plurality of annular electrodes 4, which are arranged on the opposite rotating surfaces of the rotating connection assembly. The annular electrodes 4 are fixedly connected to the first connecting piece 1. In this embodiment, the annular electrodes 4 are coaxial copper foil layers etched into a concentric ring shape and integrated on the inner side surface of the first connecting piece 1. The annular electrodes 4 are coaxial with the power output shaft 7. The number of annular electrodes 4 is consistent with the total number of all contact pieces (including signal contact pieces 51 and power contact pieces 52) in each group of elastic contact pieces. The diameter of each annular electrode 4 is adapted to the contact part of the corresponding elastic contact piece 5, so that each contact piece in each group of elastic contact pieces 5 is in one-to-one correspondence with the corresponding annular electrode 4 in diameter.

[0030] The two groups of elastic contact pieces 5 are centrally symmetrically distributed and are fixed on the inner side surface of the second connecting piece 2 by using the surface mounting process, so as to ensure the connection reliability, each group of elastic contact pieces 5 comprises a plastic retaining piece 53, four signal contact pieces 51 and two power contact pieces 52 which are sequentially and spacedly arranged on the plastic retaining piece 53 along the length direction of the plastic retaining piece 53, so as to realize the simultaneous transmission of multi-channel signals and power and ensure the equal length of signal paths to reduce the transmission delay. The plastic retaining piece 53 is used for realizing the insulation isolation and structural positioning between the contact pieces. The power contact pieces 52 are wider than the signal contact pieces 51 to meet the large current transmission requirement. The signal contact pieces 51 and the power contact pieces 52 are the same in structure and are stamped from elastic metal sheets, for example, the signal contact piece 51 comprises a main body part 511, a soldering leg 512 and a contact part 513, the main body part 511 is embedded in the plastic retaining piece 53, the soldering leg 512 extends from both ends of the main body part 511 to outside the plastic retaining piece 53 and is used for welding with the bonding pad on the second connecting piece 2, and the contact part 513 is integrally bent and formed from the middle part of the main body part 511 to the upper side. Since the elastic contact piece 5 and the annular electrode 4 will slide relative to each other, in order to reduce the friction resistance and mechanical impact in the sliding process, the contact part 513 of the signal contact piece 51 and the power contact piece 52 is designed in an arc transition manner, so as to reduce the scratching of the electrode surface and the generation of debris and prolong the service life of the connector. In working, the elastic contact piece 5 elastically abuts against the corresponding annular electrode 4 to realize the continuous electrical connection in the rotating process, the contact mode of the elastic contact piece 5 and the annular electrode 4 is surface contact or line contact, and the dynamic compensation of contact pressure is realized by the preset elastic deformation of the elastic contact piece 5.

[0031] In summary, the embodiment simplifies the connector structure by the integrated design of the PCB board, improves the contact reliability and service life by the cooperation of the elastic contact piece 5 and the arc-shaped contact part 513 and the annular electrode 4, and is especially suitable for the robot joint scene which needs the simultaneous transmission of multi-channel signals and power.

[0032] The above-described embodiments only express the implementation of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A robotic joint electrical connector, characterized by, The application relates to a rotating connection assembly and an electric contact assembly. The rotating connection assembly comprises a first connecting piece (1) and a second connecting piece (2) which rotate relative to each other, the first connecting piece (1) is connected with a fixed end of a robot, and the second connecting piece (2) is connected with a moving arm of the robot. The electric contact assembly is arranged on the relative rotating surface of the rotating connection assembly and comprises at least one group of elastic contact pieces (5) and a plurality of coaxially arranged annular electrodes (4) with different diameters, the annular electrodes (4) are fixedly connected with the first connecting piece (1), the elastic contact pieces (5) are fixedly connected with the second connecting piece (2), and the elastic contact pieces (5) elastically abut on corresponding annular electrodes (4) to realize continuous electric connection in the rotating process.

2. A robotic joint electrical connector according to claim 1, wherein: The first connecting piece (1) and the second connecting piece (2) are both made of printed circuit boards.

3. A robotic joint electrical connector according to claim 2, wherein: The elastic contact pieces (5) are divided into two groups and are centrally symmetrically distributed and fixedly connected with the second connecting piece (2) by means of surface mounting technology.

4. A robotic joint electrical connector according to claim 3, wherein: Each group of elastic contact pieces (5) comprises a plastic retaining piece (53), a plurality of signal contact pieces (51) and a plurality of power contact pieces (52) which are sequentially and spacedly arranged on the plastic retaining piece (53) along the length direction of the plastic retaining piece (53).

5. A robotic joint electrical connector as claimed in claim 1, wherein: The elastic contact pieces (5) are sheet structures with elastic deformation capacity and are made of conductive elastic materials, and the contact parts (513) are designed in arc transition.

6. A robotic joint electrical connector as claimed in claim 1, wherein: The application further comprises a fixing shell (6) which is wrapped on the outside of the first connecting piece (1) and is used for providing mechanical protection and dustproof sealing.

7. A robotic joint electrical connector as claimed in claim 1, wherein: The first connecting piece (1) and the second connecting piece (2) are provided with through holes (3) in the centers for passing through a power output shaft (7), and the power output shaft (7) is coaxially arranged with the rotating connection assembly.

Images