Automatic wire retractor for electric vehicle charging pile

Abstract

The present invention discloses an automatic retractable cable device for a charging pile, comprising a box, an upper roller, a lower roller, a first guide rod, a second guide rod, first to fourth guide rod supports, a lead screw, first to second lead screw supports, first to third connecting frames, first to second linear bearings, a lead screw nut, a first motor, an active wheel, a passive wheel, a second motor, and a plurality of limiting brackets. The first motor drives the rotation of the ball screw to form the separation and combination action of the upper and lower roller bodies, and the separation and combination of the upper and lower roller bodies complete the entire retractable cable process. This design can provide a convenient and labor-saving cable retractable cable mechanism to meet the automatic retractable cable requirements of the charging pile. The operation is intelligent, labor-saving, and safe throughout the process, and the retractable cable of a large-diameter DC cable is converted into the opening and closing movement of two half rollers. The entire structural design is simple and easy to operate, which solves the safety hazards of random exposure, easy crushing, and contamination of the cables of electric vehicle charging piles.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to an automatic wire retractor for an electric vehicle charging pile. Background Art

[0002] At present, the new energy vehicle charging pile connection cables on the market mostly require users to manually retract and release the cables during the charging process. However, after charging, users often do not perform the cumbersome cable retraction and release in accordance with the specifications, but place the charging cable next to the charging pile at will. Especially for DC fast charging piles, the cables are thick and bulky, not easy to bend, and it is difficult to manually retract and release the cables. The random placement of the charging cable causes the charging cable to be exposed to the natural environment for a long time, which accelerates the aging and wear of the charging cable, and is also susceptible to various unexpected external forces, such as people stepping on it, cars running over it, etc. Since the cable voltage belongs to high-voltage charging, once the leakage behavior is caused by the wear of the cable sheath, the consequences are disastrous. At present, retracting and releasing devices for AC charging piles can occasionally be seen on the market. Because the AC charging pile cable is thin, the required bending force is small, the retracting and releasing of the cable is relatively easy, the AC charging cable has a small bending radius, and the structural design is easy to implement and the structure is compact. However, for DC fast charging cables, the cable diameter reaches 30mm-40mm, the bending radius is usually around 200mm, the cable itself is heavy, and it is difficult to reel in and out, so there is no reeling and unreeling device for DC charging piles on the market.

[0003] In the existing literature, we have found several similar patents for charging pile retractable cables, some of which have no power, some of which have multiple layers of overlapping cables, etc., which are not suitable for large-diameter DC charging cables. In some retractable cables, the charging gun rotates around the cable axis, making it difficult for the charger to hold the charging gun. In some structural designs, it is impossible to achieve compactness, and the size of the retractable cable device may even be much larger than the charging pile. Summary of the invention

[0004] The technical problem to be solved by the present invention is that an automatic cable retracting and releasing device for a charging pile is proposed to solve the problems that the existing DC charging pile cannot reel in and release thicker cables, the cables are placed anywhere, and charging is inconvenient.

[0005] The present invention adopts the following technical solutions to solve the above technical problems:

[0006] An automatic wire retractor for an electric vehicle charging pile, comprising a box, an upper roller, a lower roller, a first guide rod, a second guide rod, first to fourth guide rod supports, a lead screw, first to second lead screw supports, first to third connecting frames, first to second linear bearings, a lead screw nut, a first motor, a driving wheel, a driven wheel, a second motor, and a plurality of limiting brackets;

[0007] The upper roller and the lower roller are both semi-cylinders, each comprising two side faces, an end face and an arc face, and when the end faces of the upper roller and the lower roller overlap, a complete cylinder is formed;

[0008] The first guide rod and the second guide rod are arranged in parallel, the two ends of the first guide rod are respectively fixedly connected to the inner wall of the box through the first and second guide rod supports, and the two ends of the second guide rod are respectively fixedly connected to the inner wall of the box through the third and fourth guide rod supports;

[0009] The first connecting frame and the second connecting frame are respectively arranged on two side surfaces of the upper half roller, and the first connecting frame and the second connecting frame are respectively provided with through holes for installing the first linear bearing and the second linear bearing; the first linear bearing and the second linear bearing are respectively arranged in the through holes of the first connecting frame and the second connecting frame; the first guide rod and the second guide rod are respectively connected to the first connecting frame and the second connecting frame through the first linear bearing and the second linear bearing, so that the upper half roller can slide freely up and down along the first guide rod and the second guide rod;

[0010] The third connecting frame is arranged on one side of the upper half roller, and is provided with a through hole for installing a lead screw nut; the lead screw nut is arranged in the through hole on the third connecting frame;

[0011] The first screw support and the second screw support are fixed on the inner wall of the box; the screw and the screw nut are threadedly connected, and the two ends of the screw are connected to the first screw support and the second screw support through bearings respectively, and the screw and the first guide rod are arranged in parallel;

[0012] The lower half roller is fixed in the box, and its end face is opposite to the end face of the upper half roller;

[0013] The first motor is fixed on the inner wall of the box body, and its output shaft is coaxially connected to one end of the lead screw, and is used to drive the lead screw to rotate, thereby making the end face of the upper roller approach or move away from the end face of the lower roller;

[0014] The plurality of limiting brackets are evenly arranged on the arc surface of the upper half roller and the lower half roller, and each limiting bracket is used for the cable to pass through, so that the plurality of limiting brackets form a spiral positioning channel for the cable to pass through, and the cable is wound on the arc surface of the upper half roller and the lower half roller according to the trajectory of the positioning channel;

[0015] The box body is provided with an inlet for the cable to extend into and an outlet for the cable to extend out;

[0016] The driving wheel and the passive wheel are correspondingly arranged at the outlet of the box body, and the wheel surfaces of the driving wheel and the passive wheel are pressed on the outer circumferential surface of the cable to guide the cable; the second motor is fixed on the inner wall of the box body, and its output shaft is coaxially connected with the rotating shaft of the driving wheel to drive the driving wheel to rotate and provide auxiliary power for the cable to enter and exit.

[0017] As a further optimization solution of the automatic wire retractor of the electric vehicle charging pile of the present invention, the limiting bracket includes a base, first to fourth rollers, and first to fourth roller sleeves;

[0018] The lower end surface of the base is used to be fixedly connected to the arc surface of the upper half roller or the lower half roller, and two bosses are arranged on the upper end surface;

[0019] The two ends of the first roller are respectively fixedly connected to the side walls of the two bosses, one end of the second roller and one end of the third roller are respectively fixedly connected to the upper end surfaces of the two bosses, and the two ends of the fourth roller are respectively fixedly connected to the other end of the second roller and the other end of the third roller;

[0020] The first to fourth rolling sleeves are respectively arranged on the first to fourth rolling shafts and can rotate freely.

[0021] As a further optimization solution of the automatic wire retractor of an electric vehicle charging pile of the present invention, the limiting bracket includes a base, a fixing plate and a third linear bearing;

[0022] The fixing plate is vertically fixedly connected to the base, and a mounting hole for mounting the third linear bearing is provided on the fixing plate;

[0023] The linear bearing is arranged in the through hole of the fixing plate;

[0024] The lower end surface of the base is used to be fixedly connected to the arc surface of the upper half roller or the lower half roller.

[0025] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0026] The invention is suitable for cables with large diameters, has a compact structure, and the cables are wound in a single layer. The cable retracting and releasing movement adopts a pure rolling friction mode, and the cable retracting and releasing movement is controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure;

[0028] Figure 2 It is a schematic diagram of the structure when the upper half roller is hollowed out;

[0029] Figure 3 It is a structural schematic diagram when the support adopts a frame type;

[0030] Figure 4 It is a schematic diagram of assembly when the bracket is limited to a frame type;

[0031] Figure 5 A schematic diagram of the structure of cable winding when the bracket is limited to a frame type;

[0032] Figure 6 Schematic diagram of the structure that limits the support to adopt the bearing type

[0033] Figure 7 The schematic diagram of the assembly is to limit the bracket to adopt the bearing type;

[0034] Figure 8 A schematic diagram of the structure of cable winding when the support adopts a bearing type;

[0035] Fig. 9 It is a structural schematic diagram when the upper half roller and the lower half roller are arranged up and down;

[0036] Fig.10 It is a schematic diagram of the structure when the upper roller and the lower roller are arranged horizontally.

[0037] In the figure, 1-box, 2-lower roller, 3-first guide rod, 4-ball screw, 5-screw nut, 6-third connecting frame, 7-screw support, 8-guide rod support, 9-first motor, 10-limiting bracket, 11-upper roller, 12-cable, 13-wire feeding wheel, 14-wire feeding wheel, 15-roller sleeve, 16-roller, 17-base, 18-third linear bearing, 19-fixed plate, A-cable lead-out end from the box, B-cable inlet end entering the box. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings:

[0039] The present invention can be implemented in many different forms and should not be considered to be limited to the embodiments described herein. On the contrary, these embodiments are provided to make this disclosure thorough and complete, and will fully express the scope of the present invention to those skilled in the art. In the accompanying drawings, components are enlarged for clarity.

[0040] like Figure 1 As shown, the present invention discloses an automatic wire retractor for an electric vehicle charging pile, comprising a box body, an upper roller, a lower roller, a first guide rod, a second guide rod, first to fourth guide rod supports, a lead screw, first to second lead screw supports, first to third connecting frames, first to second linear bearings, a lead screw nut, a first motor, a driving wheel, a driven wheel, a second motor, and a plurality of limiting brackets;

[0041] The upper roller and the lower roller are both semi-cylinders, each comprising two side faces, an end face and an arc face, and when the end faces of the upper roller and the lower roller overlap, a complete cylinder is formed;

[0042] The first guide rod and the second guide rod are arranged in parallel, the two ends of the first guide rod are respectively fixedly connected to the inner wall of the box through the first and second guide rod supports, and the two ends of the second guide rod are respectively fixedly connected to the inner wall of the box through the third and fourth guide rod supports;

[0043] The first connecting frame and the second connecting frame are respectively arranged on two side surfaces of the upper half roller, and the first connecting frame and the second connecting frame are respectively provided with through holes for installing the first linear bearing and the second linear bearing; the first linear bearing and the second linear bearing are respectively arranged in the through holes of the first connecting frame and the second connecting frame; the first guide rod and the second guide rod are respectively connected to the first connecting frame and the second connecting frame through the first linear bearing and the second linear bearing, so that the upper half roller can slide freely up and down along the first guide rod and the second guide rod;

[0044] The third connecting frame is arranged on one side of the upper half roller, and is provided with a through hole for installing a lead screw nut; the lead screw nut is arranged in the through hole on the third connecting frame;

[0045] The first screw support and the second screw support are fixed on the inner wall of the box; the screw and the screw nut are threadedly connected, and the two ends of the screw are connected to the first screw support and the second screw support through bearings respectively, and the screw and the first guide rod are arranged in parallel;

[0046] The lower half roller is fixed in the box, and its end face is opposite to the end face of the upper half roller;

[0047] The first motor is fixed on the inner wall of the box body, and its output shaft is coaxially connected to one end of the lead screw, and is used to drive the lead screw to rotate, thereby making the end face of the upper roller approach or move away from the end face of the lower roller;

[0048] The plurality of limiting brackets are evenly arranged on the arc surface of the upper half roller and the lower half roller, and each limiting bracket is used for the cable to pass through, so that the plurality of limiting brackets form a spiral positioning channel for the cable to pass through, and the cable is wound on the arc surface of the upper half roller and the lower half roller according to the trajectory of the positioning channel;

[0049] The box body is provided with an inlet for the cable to extend into and an outlet for the cable to extend out;

[0050] The driving wheel and the passive wheel are correspondingly arranged at the outlet of the box body, and the wheel surfaces of the driving wheel and the passive wheel are pressed on the outer circumferential surface of the cable to guide the cable; the second motor is fixed on the inner wall of the box body, and its output shaft is coaxially connected with the rotating shaft of the driving wheel to drive the driving wheel to rotate and provide auxiliary power for the cable to enter and exit.

[0051] The upper and lower rollers can adopt hollow structures to make the whole lighter. Figure 2 shown.

[0052] like Figure 3 As shown, the limiting bracket can be designed as a frame type, including a base, first to fourth rollers, and first to fourth roller sleeves;

[0053] The lower end surface of the base is used to be fixedly connected to the arc surface of the upper half roller or the lower half roller, and two bosses are arranged on the upper end surface;

[0054] The two ends of the first roller are respectively fixedly connected to the side walls of the two bosses, one end of the second roller and one end of the third roller are respectively fixedly connected to the upper end surfaces of the two bosses, and the two ends of the fourth roller are respectively fixedly connected to the other end of the second roller and the other end of the third roller;

[0055] The first to fourth rolling sleeves are respectively arranged on the first to fourth rolling shafts and can rotate freely.

[0056] Figure 4 It is a schematic diagram of assembly when the bracket is limited to a frame type; Figure 5 It is a schematic diagram of the structure of cable winding when the bracket adopts a frame type.

[0057] like Figure 6 As shown, the limiting bracket can also be designed as a bearing type, including a base, a fixing plate and a third linear bearing;

[0058] The fixing plate is vertically fixedly connected to the base, and a mounting hole for mounting the third linear bearing is provided on the fixing plate;

[0059] The linear bearing is arranged in the through hole of the fixing plate;

[0060] The lower end surface of the base is used to be fixedly connected to the arc surface of the upper half roller or the lower half roller.

[0061] Figure 7 The schematic diagram of the assembly is to limit the bracket to adopt the bearing type; Figure 8 It is a schematic diagram of the structure of cable winding when the bracket adopts a bearing type.

[0062] The upper and lower rollers can be arranged up and down, such as Fig. 9 As shown, it can also be arranged horizontally, such as Fig.10 shown.

[0063] In the present invention, a length measuring sensor can also be arranged in the box body to measure and control the length of the cable entering and exiting; a torque sensor is arranged on the driving wheel at the cable outlet of the box body to sense whether the cable is pulled, and a single-chip microcomputer is equipped to control the first motor and the second motor, so as to further realize the automatic retracting and releasing function.

[0064] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0065] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic cable retractor for an electric vehicle charging pile, characterized in that: It includes a box body, an upper roller, a lower roller, a first guide rod, a second guide rod, first to fourth guide rod supports, a lead screw, first to second lead screw supports, first to third connecting frames, first to second linear bearings, a lead screw nut, a first motor, a driving wheel, a driven wheel, a second motor, and a plurality of limiting brackets; The upper roller and the lower roller are both semi-cylinders, each comprising two side faces, an end face and an arc face, and when the end faces of the upper roller and the lower roller overlap, a complete cylinder is formed; The first guide rod and the second guide rod are arranged in parallel, the two ends of the first guide rod are respectively fixedly connected to the inner wall of the box through the first and second guide rod supports, and the two ends of the second guide rod are respectively fixedly connected to the inner wall of the box through the third and fourth guide rod supports; The first connecting frame and the second connecting frame are respectively arranged on two side surfaces of the upper half roller, and the first connecting frame and the second connecting frame are respectively provided with through holes for installing the first linear bearing and the second linear bearing; the first linear bearing and the second linear bearing are respectively arranged in the through holes of the first connecting frame and the second connecting frame; the first guide rod and the second guide rod are respectively connected to the first connecting frame and the second connecting frame through the first linear bearing and the second linear bearing, so that the upper half roller can slide freely up and down along the first guide rod and the second guide rod; The third connecting frame is arranged on one side of the upper half roller, and is provided with a through hole for installing a lead screw nut; the lead screw nut is arranged in the through hole on the third connecting frame; The first screw support and the second screw support are fixed on the inner wall of the box; the screw and the screw nut are threadedly connected, and the two ends of the screw are connected to the first screw support and the second screw support through bearings respectively, and the screw and the first guide rod are arranged in parallel; The lower half roller is fixed in the box, and its end face is opposite to the end face of the upper half roller; The first motor is fixed on the inner wall of the box body, and its output shaft is coaxially connected to one end of the lead screw, and is used to drive the lead screw to rotate, thereby making the end face of the upper roller approach or move away from the end face of the lower roller; The plurality of limiting brackets are evenly arranged on the arc surface of the upper half roller and the lower half roller, and each limiting bracket is used for the cable to pass through, so that the plurality of limiting brackets form a spiral positioning channel for the cable to pass through, and the cable is wound on the arc surface of the upper half roller and the lower half roller according to the trajectory of the positioning channel; The box body is provided with an inlet for the cable to extend into and an outlet for the cable to extend out; The driving wheel and the passive wheel are correspondingly arranged at the outlet of the box body, and the wheel surfaces of the driving wheel and the passive wheel are pressed on the outer circumferential surface of the cable to guide the cable; the second motor is fixed on the inner wall of the box body, and its output shaft is coaxially connected with the rotating shaft of the driving wheel to drive the driving wheel to rotate and provide auxiliary power for the cable to enter and exit.

2. The automatic cable retractor for an electric vehicle charging pile according to claim 1, characterized in that: The limiting bracket includes a base, first to fourth rollers, and first to fourth roller sleeves; The lower end surface of the base is used to be fixedly connected to the arc surface of the upper half roller or the lower half roller, and two bosses are arranged on the upper end surface; The two ends of the first roller are respectively fixedly connected to the side walls of the two bosses, one end of the second roller and one end of the third roller are respectively fixedly connected to the upper end surfaces of the two bosses, and the two ends of the fourth roller are respectively fixedly connected to the other end of the second roller and the other end of the third roller; The first to fourth rolling sleeves are respectively arranged on the first to fourth rolling shafts and can rotate freely.

3. The automatic wire retractor for an electric vehicle charging pile according to claim 1, characterized in that: The limiting bracket includes a base, a fixing plate and a third linear bearing; The fixing plate is vertically fixedly connected to the base, and a mounting hole for mounting the third linear bearing is provided on the fixing plate; The linear bearing is arranged in the through hole of the fixing plate; The lower end surface of the base is used to be fixedly connected to the arc surface of the upper half roller or the lower half roller.

4. The automatic cable retractor for an electric vehicle charging pile according to claim 1, characterized in that: The upper roller and the lower roller are both hollowed out.

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