An automatic gun-pulling automobile charging gun

Abstract

The application discloses an automatic car charging gun, and relates to the technical field of car charging. The automatic car charging gun comprises a shell, a gun head retraction mechanism arranged in the shell and used for controlling the extension or retraction of a charging gun head, a mechanical lock assembly arranged in the shell and used for locking the shell and a car charging port, a linkage assembly used for connecting the gun head retraction mechanism and the mechanical lock assembly, a first opening hole formed in the shell and used for allowing the charging gun head to pass through, and the charging gun head and the first opening hole are in sliding connection. When the charging gun head is extended, the linkage assembly locks the mechanical lock assembly and supplies power to the charging gun head. When the charging gun head is retracted, the linkage assembly unlocks the mechanical lock assembly and cuts off the power supply of the charging gun head. The whole structure is simple and low in cost. The automatic car charging gun can realize the function of automatic gun pulling and protect the charging gun head by retracting the charging gun head into the shell under the condition of meeting the requirements of the national standard.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile charging, and in particular to an automobile charging gun with automatic draw function. Background Art

[0002] To meet the charging needs of electric vehicles, the number of public charging stations in my country continues to increase. However, difficulties in charging and an imbalance in the ratio of vehicles to charging stations remain obstacles to the development of new energy vehicles. On the one hand, poorly planned charging station layouts in some areas have led to a significant number of idle charging stations. Many charging stations are in disrepair and their supporting equipment is outdated and no longer functioning properly. On the other hand, the serious problem of fuel-powered vehicles occupying charging stations and electric vehicles not charging has made it even more difficult to obtain already scarce charging stations. Automated vehicle charging equipment can effectively address these issues. The automated vehicle charging process requires addressing three key issues: robot mobility, automated charging station insertion, and automated charging station removal. Mobile robot technology is relatively mature, and currently, charging station insertion can be performed by the vehicle owner. Solving the issue of automated charging station removal will effectively advance the automation of vehicle charging.

[0003] The charging gun is a key component that connects the charging device to the charging port of a new energy vehicle. When used in conjunction with the charging port, the charging gun requires a mechanical lock to prevent it from falling off while powered on. This could cause a disconnect between the gun and the vehicle's charging port and prevent the vehicle from charging properly. Existing charging guns are mostly manually plugged in and out, lacking automatic unplugging capabilities.

[0004] Publication No. CN110696664A discloses a fully automatic charging robot. The patent discloses a robotic arm that magnetically grasps the charging gun, automatically extracting the gun through the arm's movement. This solution requires the robotic arm to use an identification device to accurately locate and grasp the charging gun, which requires high precision and increases the cost of the robotic arm. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a low-cost and safe car charging gun with automatic drawer.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0007] Provided is an automatic-drawing car charging gun, comprising a housing, a gun head retraction mechanism disposed within the housing for controlling the extension or retraction of the charging gun head; the charging gun head is connected to the gun head retraction mechanism via a gun head connection structure; and a mechanical lock assembly is further disposed within the housing for locking the housing to the car charging port.

[0008] The gun head retraction mechanism is connected to the mechanical lock assembly through a linkage assembly; a first opening is provided on the housing for the charging gun head to pass through; the charging gun head is slidably engaged with the first opening;

[0009] When the charging gun head is extended, the linkage assembly locks the mechanical lock assembly and the charging gun head is powered on; when the charging gun head is retracted, the linkage assembly unlocks the mechanical lock assembly and the charging gun head is powered off.

[0010] The charging gun head is retracted into the shell through the gun head retraction mechanism, thereby disengaging the charging gun head from the car's charging port. As the charging gun head retracts, the mechanical lock assembly is unlocked under the action of the linkage assembly, making it easy to recycle the charging gun.

[0011] Furthermore, the mechanical lock assembly includes a lock rod parallel to the charging gun head, the middle section of the lock rod being rotatably connected to the housing via a rotating shaft; a lock hook is provided at one end of the lock rod, the lock hook passes through the housing through the second opening, and the lock rod is movable within the second opening; a return spring is provided at the other end of the lock rod;

[0012] The linkage assembly includes a first micro switch for controlling the power on and off of the charging gun head, a ramp provided on the lock rod, and a protrusion provided on the gun head connection structure, wherein the first micro switch is located on a side of the protrusion away from the first opening;

[0013] When the gun head retraction mechanism controls the charging gun head to extend, the inclined platform abuts against the first micro switch; when the gun head retraction mechanism controls the charging gun head to retract, the inclined platform abuts against the protrusion.

[0014] Furthermore, the gun head retraction mechanism includes an electric push rod or a synchronous pulley;

[0015] When the axial space length of the charging gun head in the shell is l cha When ≥3l+Δl, the gun head retraction mechanism is an electric push rod, otherwise, the gun head retraction mechanism is a synchronous pulley;

[0016] Wherein, l is the retraction distance of the gun tip, Δl is the length of the gun tip connection structure, and 0.5l≤Δl≤1.5l.

[0017] Furthermore, the ramp includes a straight ramp, a convex arc ramp, a concave arc ramp or a cantilever beam deflection curve ramp.

[0018] Furthermore, when the ramp is a straight ramp, the lifting height of the lock hook of the mechanical lock must satisfy the following formula:

[0019]

[0020] Among them, h max The maximum height of the hook of the mechanical lock is raised, and h max≥1.5mm; θ is the angle between the inclined surface of the linear ramp and the locking rod of the mechanical lock; l is the retraction distance of the gun head;

[0021] When the ramp is a concave arc ramp, the lifting height of the mechanical lock must satisfy the following formula:

[0022]

[0023] Wherein, R is the arc radius of the concave arc ramp.

[0024] Furthermore, a coordinate system is established on the orthographic projection of the charging gun. In the orthographic projection, the endpoint of the lower left corner of the shell is the coordinate origin, the axis direction of the gun head retraction structure is the x-axis, and the coordinate origin points to the end of the shell away from the charging gun head as the positive direction of the x-axis; the vertical line is the y-axis, and the vertical upward is the positive direction of the y-axis; the height of the ramp h ca =y sh -y mo -Δh; where y sh is the x-axis coordinate of the rotation axis; y mo is the y-axis coordinate of the gun head retraction mechanism axis; Δh is the distance between the top of the charging gun head and the gun head retraction mechanism axis;

[0025] The position of the ramp on the locking rod ca =l lo +Δl cha -x mo -3l-Δl; where l lo is the length of the locking rod; Δl cha is the distance between the end of the lock hook away from the housing and the housing; x mo is the x-axis coordinate of the end of the gun head connection structure away from the charging gun head; l is the retraction distance of the gun head.

[0026] Furthermore, a coordinate system is established on the orthographic projection of the charging gun. In the orthographic projection perspective, the endpoint of the lower left corner of the shell is the coordinate origin, the axis direction of the gun head retraction structure is the x-axis, and the coordinate origin points to the end of the shell away from the charging gun head as the positive direction of the x-axis; the vertical line is the y-axis, and the vertical upward is the positive direction of the y-axis; when the ramp is a linear ramp, the slope curve equation of the ramp is: F(x ca ,y ca )=x ca +ty ca =0, where t is the curvature influence factor, x ca is the x-axis coordinate of the inclined surface of the inclined platform on the orthographic projection, y ca is the y-axis coordinate of the inclined plane of the ramp in the orthographic projection, and

[0027] t = -sinθ;

[0028]

[0029] Where θ is the angle between the linear ramp and the locking rod of the mechanical lock; l is the retraction distance of the gun head; h ca is the height of the ramp;

[0030] When the ramp is a concave arc ramp, the slope curve equation of the ramp is:

[0031] (x ca -x sh +l ca ) 2 +(y ca -y sh +R) 2 =R 2 ;

[0032] Among them, x sh is the x-axis coordinate of the rotation axis; y sh is the y-axis coordinate of the rotation axis; l ca is the distance from the left end of the ramp to the right end of the locking rod; R is the arc radius of the concave arc ramp surface.

[0033] The beneficial effects of the present invention are:

[0034] The present invention uses a tip retraction mechanism to retract the charging gun tip into the housing, thereby disengaging the charging gun tip from the vehicle's charging port. As the charging gun tip retracts, the linkage assembly releases the mechanical lock assembly, facilitating the continuous robotic arm's retrieval of the charging gun. The overall structure is simple and low-cost, meeting national standards while enabling automatic gun extraction. Retracting the charging gun tip into the housing also protects the tip. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the internal structure of the charging gun when the charging gun head is extended;

[0036] Figure 2 This is a schematic diagram of the internal structure of the charging gun when the charging gun head is retracted;

[0037] Figure 3 for Figure 2 A magnified schematic diagram of point A in the middle;

[0038] Figure 4 This is a schematic diagram of the orthographic projection coordinate system.

[0039] Among them, 1. Shell; 2. Electric push rod; 3. Charging gun head; 4. Gun head connection structure; 5. Lock rod; 6. Rotating shaft; 7. Lock hook; 8. Return spring; 9. First micro switch; 10. Inclined platform; 11. Bump; 12. Button. DETAILED DESCRIPTION

[0040] The specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0041] like Figure 1-3 As shown, an automatic charging gun for automobiles includes a housing 1, which is composed of two half-shells 1 assembled by bolts; a gun head retraction mechanism for controlling the extension or retraction of the charging gun head 3 is provided in the housing 1; the gun head retraction mechanism includes an electric push rod 2 or a synchronous pulley;

[0042] When the axial space length l of the charging gun head 3 in the housing 1 cha When ≥3l+Δl, the gun head retraction mechanism is the electric push rod 2, otherwise, the gun head retraction mechanism is the synchronous pulley;

[0043] Wherein, l is the retraction distance of the gun tip, Δl is the length of the gun tip connecting structure 4, and 0.5l≤Δl≤1.5l.

[0044] In this embodiment, the gun head retraction mechanism is an electric push rod 2;

[0045] The movable rod of the electric push rod 2 is fixedly connected to the charging gun head 3, and the electric push rod 2 drives the charging gun head 3 to move along the length direction of the shell 1; a mechanical lock component is also provided in the shell 1 to lock the shell 1 with the car charging port;

[0046] The gun head retraction mechanism is connected to the mechanical lock assembly through a linkage assembly; a first opening is provided on the housing 1 for the charging gun head 3 to pass through; the charging gun head 3 is slidably engaged with the first opening;

[0047] When the charging gun head 3 is extended, the linkage assembly locks the mechanical lock assembly and the charging gun head 3 is powered on; when the charging gun head 3 is retracted, the linkage assembly unlocks the mechanical lock assembly and the charging gun head 3 is powered off.

[0048] The mechanical lock assembly includes a lock rod 5 parallel to the charging gun head 3. The lock rod 5 is made of metal. The metal lock rod 5 has a longer service life and is not easily deformed under high temperature conditions outdoors, so that the mechanical lock assembly can work smoothly under outdoor conditions; the middle section of the lock rod 5 is rotatably connected to the housing 1 through a rotating shaft 6; a lock hook 7 is provided at one end of the lock rod 5, and the lock hook 7 passes through the housing 1 through the second opening, and the lock rod 5 can move in the second opening. When the lock rod 5 rotates along the rotating shaft 6, the lock rod 5 moves up and down in the second opening; a reset spring 8 is provided at the other end of the lock rod 5; one end of the reset spring 8 is fixedly connected to the lock rod 5, and the other end of the reset spring 8 is fixedly connected to the fixed rod of the electric push rod 2;

[0049] The linkage assembly includes a first micro switch 9 for controlling the power on and off of the charging gun head 3, a ramp 10 provided on the lock rod 5, and a protrusion 11 provided on the charging gun head 3. The first micro switch 9 is located on the side of the protrusion 11 away from the first opening.

[0050] like Figure 1 As shown, when the gun head retraction mechanism controls the charging gun head 3 to extend, the ramp 10 abuts against the first micro switch 9; under the action of the return spring 8, the end of the lock rod 5 close to the lock hook 7 falls, so that the lock hook 7 is locked with the car's lock slot; at the same time, the ramp 10 presses down the first micro switch 9 under the action of the return spring 8, so that the first micro switch 9 is triggered, and the charging gun head 3 is energized to charge the car. Figure 2 As shown, when the charging gun head 3 is retracted within the housing 1, that is, the electric push rod 2 is in the retracted state, the inclined platform 10 abuts the protrusion 11, which pushes the inclined platform 10 upward. In turn, the protrusion 11 pushes up the end of the locking rod 5 near the lock hook 7, causing the lock hook 7 to disengage from the vehicle's lock slot, thereby unlocking the mechanical lock assembly. At the same time, the lock hook 7 is lifted, causing the first micro switch 9 to be released.

[0051] A button 12 is also provided on the housing 1. The button 12 is located at the end of the locking rod 5 away from the locking hook 7, and the button 12 abuts against the locking rod 5. When the vehicle is not fully charged, the charging gun is not automatically unplugged and the user needs to leave, the user can manually press the button 12 to remove the charging gun. When the button 12 is pressed, the locking hook 7 is lifted, so that the first microswitch 9 is released, and the electric push rod 2 simultaneously drives the charging gun head 3 to retract into the housing 1, which can not only disconnect the power supply of the charging gun head 3 through the linkage assembly, but also retract the charging gun head 3 into the housing 1 to protect the charging gun head 3.

[0052] The ramp 10 includes a straight ramp, a convex arc ramp, a concave arc ramp or a cantilever beam deflection curve ramp; this embodiment adopts a straight ramp;

[0053] When the ramp 10 is a straight ramp, the lifting height of the lock hook 7 of the mechanical lock must satisfy the following formula:

[0054]

[0055] Among them, h max The maximum height of the hook 7 of the mechanical lock is raised, and h max ≥1.5mm; θ is the angle between the inclined surface of the linear ramp 10 and the locking rod 5 of the mechanical lock; l is the retraction distance of the gun head;

[0056] When the ramp 10 is a concave arc-shaped ramp, the lifting height of the mechanical lock must satisfy the following formula:

[0057]

[0058] Wherein, R is the arc radius of the concave arc ramp;

[0059] like Figure 4 As shown, a coordinate system is established on the orthographic projection of the charging gun. In the orthographic projection, the endpoint of the lower left corner of the shell 1, that is, point B, is the coordinate origin. The axis direction of the gun head retraction structure is the x-axis, and the coordinate origin points to the end of the shell 1 away from the charging gun head 3 as the positive direction of the x-axis; the vertical line is the y-axis, and the vertical upward direction is the positive direction of the y-axis; the height h of the ramp 10 is 100. ca =y sh -y mo -Δh; where y sh is the x-axis coordinate of the rotation axis; y mo is the y-axis coordinate of the gun head retraction mechanism axis; Δh is the distance between the top of the charging gun head 3 and the gun head retraction mechanism axis;

[0060] Position 1 of ramp 10 on locking rod 5 ca =l lo +Δl cha -x mo -3l-Δl; where l lo is the length of the locking rod 5; Δl cha x is the distance between the end of the lock hook 7 away from the housing 1 and the housing 1; mo is the x-axis coordinate of the end of the gun head connecting structure 4 away from the charging gun head 3, that is, the x-axis coordinate of point C; l is the retraction distance of the gun head.

[0061] When the ramp 10 is a straight ramp, the slope curve equation of the ramp 10 is: ca ,y ca )=x ca +ty ca =0, where t is the curvature influence factor, x ca is the x-axis coordinate of the inclined surface of the inclined platform 10 in the orthographic projection, y ca is the y-axis coordinate of the inclined surface of the ramp 10 in the orthographic projection, and

[0062] t = -sinθ;

[0063]

[0064] Wherein, θ is the angle between the linear ramp surface and the locking rod 5 of the mechanical lock; l is the retraction distance of the gun head; h ca is the height of the ramp 10;

[0065] When the ramp is a concave arc ramp, the slope curve equation of the ramp is:

[0066] (x ca -x sh +l ca ) 2 +(y ca -y sh +R) 2 =R 2 ;

[0067] Among them, x sh is the x-axis coordinate of the rotation axis; y sh is the y-axis coordinate of the rotation axis; l ca is the distance from the left end of the ramp to the right end of the locking rod; R is the arc radius of the concave arc ramp surface.

[0068] The working principle and use process of the present invention:

[0069] When the car is fully charged, the electric push rod 2 operates, driving the charging gun head 3 to retract. During the retraction process, the edge of the protrusion 11 contacts the inclined surface of the ramp 10, which pushes the ramp 10 upward. Under the action of the protrusion 11, the locking rod 5 rotates clockwise along the rotating shaft 6, so that the protrusion 11 pushes up the end of the locking rod 5 closest to the lock hook 7, causing the lock hook 7 to disengage from the car's lock slot. During the retraction process, the ramp 10 and the first micro switch 9 are disconnected, disconnecting the charging gun head 3 from power. The charging gun is then retrieved by the robotic arm.

[0070] When the vehicle is not fully charged and the charging gun is not automatically unplugged and the user needs to leave, the button 12 is manually pressed. The button 12 presses the right end of the locking rod 5 downward, and the locking rod 5 rotates clockwise along the rotating shaft 6. The lock hook 7 disengages from the lock slot of the car, and the charging gun can be unplugged.

Claims

1. A car charging gun with automatic gun removal, the charging gun is connected to a continuous type robotic arm, characterized in that: The charging gun head includes a housing, wherein a gun head retraction mechanism for controlling the extension or retraction of the charging gun head is provided in the housing; the charging gun head is connected to the gun head retraction mechanism via a gun head connection structure; and a mechanical lock assembly for locking the housing to the vehicle charging port is also provided in the housing; The gun head retraction mechanism is connected to the mechanical lock assembly through a linkage assembly; a first opening is provided on the housing for the charging gun head to pass through; the charging gun head is slidably engaged with the first opening; When the charging gun head is extended, the linkage assembly locks the mechanical lock assembly and the charging gun head is powered on; when the charging gun head is retracted, the linkage assembly unlocks the mechanical lock assembly and the charging gun head is powered off; The mechanical lock assembly includes a lock rod parallel to the charging gun head, the middle section of the lock rod being rotatably connected to the housing via a rotating shaft; a lock hook is provided at one end of the lock rod, the lock hook passes through the housing through a second opening, and the lock rod is movable within the second opening; a return spring is provided at the other end of the lock rod; The housing is also provided with a button, which is located at the end of the lock rod away from the lock hook, and the button abuts against the lock rod; The linkage assembly includes a first micro switch for controlling the power on and off of the charging gun head, a ramp provided on the lock rod, and a protrusion provided on the gun head connection structure, wherein the first micro switch is located on a side of the protrusion away from the first opening; When the gun head retraction mechanism controls the charging gun head to extend, the inclined platform abuts against the first micro switch; when the gun head retraction mechanism controls the charging gun head to retract, the inclined platform abuts against the protrusion.

2. The automatic draw-out car charging gun according to claim 1, characterized in that: The gun head retraction mechanism includes an electric push rod or a synchronous pulley; When the axial space length of the charging gun head in the shell l cha ≥3 l +∆ l When the gun head retracts, the gun head retracts by an electric push rod; otherwise, the gun head retracts by a synchronous pulley; in, l is the gun tip retraction distance, ∆ l is the length of the gun head connection structure, and 0.5 l ≤∆ l ≤1.5 l .

3. The automatic draw-out car charging gun according to claim 1, characterized in that: The ramp includes a straight ramp, a convex arc ramp, a concave arc ramp or a cantilever beam flexure curve ramp.

4. The automatic draw-out car charging gun according to claim 3, characterized in that: When the ramp is a straight ramp, the lifting height of the lock hook of the mechanical lock must meet the following formula: ； in, h max The maximum height to which the shackle of the mechanical lock is raised, and h max ≥1.5mm; θ The angle between the inclined surface of the linear ramp and the locking rod of the mechanical lock; l is the gun tip retraction distance; When the ramp is a concave arc ramp, the lifting height of the mechanical lock must satisfy the following formula: ； in, R It is the arc radius of the concave arc ramp.

5. The automatic draw-out car charging gun according to claim 1, characterized in that: A coordinate system is established on the orthographic projection of the charging gun. In the orthographic projection, the endpoint of the lower left corner of the shell is the coordinate origin, the axis direction of the gun head retraction structure is the x-axis, and the coordinate origin points to the end of the shell away from the charging gun head as the positive direction of the x-axis; the vertical line is the y-axis, and the vertical upward is the positive direction of the y-axis; the height of the inclined platform is h ca = y sh - y mo -∆ h ;in, y sh is the x-axis coordinate of the rotation axis; y mo is the y-axis coordinate of the axis of the gun head retraction mechanism; h The distance between the top of the charging gun tip and the axis of the gun tip retraction mechanism; The position of the ramp on the locking rod is the distance from the left end of the ramp to the right end of the locking rod. l ca = l lo +∆ l cha - x mo -3 l -∆ l ;in, l lo is the length of the locking rod; ∆ l cha The distance between the end of the lock hook away from the housing and the housing; x mo The x-axis coordinate of the end of the gun head connection structure away from the charging gun head; l The retraction distance of the gun tip.

6. The automatic draw-out car charging gun according to claim 1, characterized in that: A coordinate system is established on the orthographic projection of the charging gun. In the orthographic projection, the endpoint of the lower left corner of the shell is the coordinate origin, the axis direction of the gun head retraction structure is the x-axis, and the origin of the coordinate points to the end of the shell away from the charging gun head as the positive direction of the x-axis; the vertical line is the y-axis, and the vertical upward direction is the positive direction of the y-axis; when the ramp is a linear ramp, the slope curve equation of the ramp is: F ( x ca , y ca ) = x ca + ty ca =0, where t is the curvature influence factor, x ca is the x-axis coordinate of the inclined surface of the inclined table on the orthographic projection, y ca is the y-axis coordinate of the inclined plane of the ramp in the orthographic projection, and ； ； in, θ The angle between the inclined surface of the linear ramp and the locking rod of the mechanical lock; l is the gun tip retraction distance; h ca is the height of the ramp; When the ramp is a concave arc ramp, the slope curve equation of the ramp is: ； in, x sh is the x-axis coordinate of the rotation axis; y sh is the y-axis coordinate of the rotation axis; l ca is the distance from the left end of the ramp to the right end of the locking rod; R It is the arc radius of the concave arc ramp.

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