Mechanical lock device for automatic charging gun head

Abstract

The present invention relates to a mechanical lock device for an automatic charging gun head. The mechanical lock device comprises a mechanical lock rod (2), wherein the mechanical lock rod (2) is hinged to a charging gun body (1), with one end of the mechanical lock rod (2) extending from a port (1a) of the charging gun body (1) and being provided with a lock hook (2a), and the other end thereof being hinged to an electromagnetic push-pull rod (3); a microswitch (4) is provided below the electromagnetic push-pull rod (3); a micro-motion shaft of the microswitch (4) is arranged directly below the axis of the electromagnetic push-pull rod (3); the electromagnetic push-pull rod (3) and the microswitch (4) are both connected in the charging gun body (1); and the axis of the electromagnetic push-pull rod (3) is perpendicular to a bisector of a rotation angle of the mechanical lock rod (2). The present invention has the advantages that the functions of automatic locking and unlocking are reliably achieved, and an adverse effect caused by the non-coincidence of motion trajectories of components in a locking mechanism is avoided to the greatest extent, thereby maximizing the effect of a mechanical lock.

Description

A mechanical lock device for automatic charging gun head Technical Field

[0001] The present invention relates to the technical field of automatic charging equipment, and in particular to a mechanical locking device for an automatic charging gun head. Background Art

[0002] When the automatic charging device is charging, if the robotic arm only controls one gun head, the robotic arm can always maintain the charging posture. If the robotic arm controls multiple gun heads, the robotic arm needs to separate from the gun head after completing the gun insertion action. At this time, only the gun head part is connected to the car charging station with the charging cable.

[0003] At present, after a manual charging gun is inserted into a car charging seat, there is generally a hook that hooks the charging seat to prevent the charging gun from falling. The manual gun needs to be manually pressed to open the hook to complete the gun extraction; however, in automatic charging equipment, the hand cannot be used to extract the gun, and the action of opening the hook requires a mechanical structure to complete. Therefore, it is necessary to design a device that can lock the automatic charging gun head to assist in the connection between the gun head and the car charging seat.

[0004] In the prior art, there are some solutions that use connecting rods and drive devices to achieve locking and unlocking. One end of the connecting rod is used for connection and locking, and the other end cooperates with the drive device. However, the motion trajectory of the connecting rod generally rotates with the rotating shaft as the fulcrum, so the trajectories of the two ends of the connecting rod are circular motions, while the drive device generally reciprocates along its axial direction, so its motion trajectory is a straight line. Therefore, the motion trajectories of the two do not overlap. This mismatch of trajectories will bring two problems. First, the drive device will generate displacement and component force along the direction of the connecting rod during operation. However, the displacement along the direction of the rod is invalid displacement and will also increase the movement resistance of the drive device. The component force along the direction of the rod will be transmitted to the rotation fulcrum, increasing the rotation resistance at the rotation fulcrum. These unfavorable factors will reduce the effective stroke and push-pull force of the connecting rod.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to solve the problem of low locking firmness and poor reliability between the existing automatic charging gun and the charging base, and to provide a mechanical locking device for the automatic charging gun head, which can not only reliably realize the automatic locking and lifting functions, better meet the needs of automatic charging, but also avoid the adverse effects caused by the non-overlapping motion trajectories of the various components in the locking mechanism to the greatest extent, thereby maximizing the effect of the mechanical lock.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A mechanical lock device for an automatic charging gun head includes a mechanical lock rod, which is hinged to the charging gun body. One end of the mechanical lock rod extends out of the port of the charging gun body and is provided with a lock hook, and the other end is hingedly connected to an electromagnetic push-pull rod. A micro switch is provided below the electromagnetic push-pull rod, and the micro shaft of the micro switch is provided directly below the axis of the electromagnetic push-pull rod. The electromagnetic push-pull rod and the micro switch are both connected to the charging gun body, and the axis of the electromagnetic push-pull rod is perpendicular to the bisector of the rotation angle of the mechanical lock rod, so that the electromagnetic push-pull rod can most effectively drive the mechanical lock rod to rotate to achieve locking and unlocking.

[0009] Furthermore, a mounting cavity is provided in the charging gun body, one end of the mounting cavity is flush with the port of the charging gun body, a mechanical lock rod is provided in the mounting cavity, and the size of the mounting cavity meets the rotation angle requirement of the mechanical lock rod.

[0010] Furthermore, the mechanical locking rod includes a straight section, a slope section, a bent section and a connecting section connected in sequence, one end of the straight section passes through the installation cavity and extends out of the port, the lock hook is arranged on one side of the straight section extending out of the port and is arranged perpendicular to the straight section, the other side of the straight section is connected to the slope section, the slope section is inclined from the straight section toward the direction close to the inner wall of the charging gun body and is connected to a rotating shaft, the bent section extends from the rotating shaft toward the direction away from the inner wall of the charging gun body and is connected to the connecting section, and the connecting section and the bent section are perpendicular to each other, and the end of the connecting section is connected to the telescopic shaft of the electromagnetic push-pull rod, so as to realize that the electromagnetic push-pull rod drives the mechanical locking rod to rotate a certain angle around the rotating shaft.

[0011] Furthermore, the end of the connecting section is connected to the telescopic shaft of the electromagnetic push-pull rod through a connecting shaft, and both ends of the connecting shaft are fixed to the charging gun body through locks to prevent the connecting shaft from moving in the axial direction.

[0012] Furthermore, the electromagnetic push-pull rod is fixed to the mounting base 1 by means of bolts, and the mounting base 1 is connected to the inner wall of the charging gun body.

[0013] Furthermore, the micro switch is fixed to the second mounting base by means of bolts, and the second mounting base is fixedly connected to the first mounting base.

[0014] Furthermore, a manual emergency switch is provided on the charging gun body, which is connected to the connecting section of the mechanical lock rod through a flexible connector, and the flexible connector is in a relaxed state in non-emergency situations. In an emergency situation, the manual emergency switch drives the flexible connector to tighten and pull the mechanical lock rod for emergency unlocking.

[0015] Furthermore, the manual emergency switch is a hand-tightened bolt, and a threaded hole is provided on the charging gun body. The hand-tightened bolt is screwed into the charging gun body through the threaded hole. The flexible connecting part is a thin steel wire rope, one end of the thin steel wire rope is connected to the hand-tightened bolt, and the other end is connected to the mechanical locking rod.

[0016] The present invention also provides an automatic charging gun head including the above-mentioned mechanical locking device.

[0017] Compared with the prior art, the specific advantages of the technical solution of the present invention are:

[0018] (1) The device of the present invention has a simple and reliable structure. The electromagnetic push-pull rod controls the two actions of the lock rod, namely, the lowering and lifting actions, by means of positive and negative power supply. The direct connection mode is reliable, and the automatic locking and lifting functions are well realized.

[0019] (2) The present invention adopts an electromagnetic push-pull rod, which has a fast response speed and can quickly switch the lock rod state, better meeting the use requirements of automatic charging and shortening the time of inserting and removing the gun;

[0020] (3) The micro switch of the present invention can determine the position of the lock rod in real time, preventing the system from making an incorrect judgment on the position of the lock rod;

[0021] (4) The present invention also adds an emergency unlocking device with a simple structure. Since the unlocking is triggered only by turning a screw, it effectively avoids user misoperation. In addition, the user does not need additional tools to unlock the door in an emergency, which is easy to operate.

[0022] (5) The present invention installs the axis of the electromagnetic push-pull rod perpendicular to the bisector of the rotation angle of the mechanical lock rod. Under the premise that the rotational motion of the lock rod and the linear motion of the electromagnetic push-pull rod cannot be completely overlapped, the adverse effects are minimized and the effective stroke and push-pull force of the electromagnetic push-pull rod are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a diagram showing the internal structure of a mechanical lock device for an automatic charging gun head according to the present invention;

[0024] FIG2 is a structural diagram of a mechanical lock device for an automatic charging gun head according to the present invention from a port perspective;

[0025] FIG3 is a structural diagram of a mechanical lock rod of the present invention;

[0026] FIG4 is a schematic diagram showing the angles of the electromagnetic push-pull rod and the mechanical lock rod of the present invention;

[0027] FIG5 is a schematic diagram of an electromagnetic push-pull rod in a vertical installation according to a first embodiment of the present invention;

[0028] FIG6 is a schematic diagram of the installation angle structure of the electromagnetic push-pull rod of the present invention. DETAILED DESCRIPTION

[0029] Example 1

[0030] To make the present invention more clear, a mechanical lock device for an automatic charging gun head of the present invention is further described below with reference to the accompanying drawings. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] Referring to Figures 1 and 2, a mechanical lock device for an automatic charging gun head is characterized by:

[0032] A mounting cavity 1b is provided in the charging gun body 1, and one end of the mounting cavity 1b is flush with the port 1a of the charging gun body 1;

[0033] Referring to Figures 1 and 3, a mechanical lock rod 2 is also provided in the charging gun body 1. The mechanical lock rod 2 includes a straight section 21, a slope section 22, a bent section 23 and a connecting section 24 connected in sequence. One end of the straight section 21 passes through the mounting cavity 1b and extends out of the port 1a. A lock hook 2a is provided at the end thereof. The other side of the straight section 21 is connected to the slope section 22. The slope section 22 is inclined from the straight section 21 toward the direction close to the inner wall of the charging gun body 1 and is connected to a rotating shaft 5. The bent section 23 extends from the rotating shaft 5 toward the direction away from the inner wall of the charging gun body 1 and is connected to the connecting section 24. The connecting section 24 and the bent section 23 are perpendicular to each other. The size of the mounting cavity 1b meets the rotation angle requirements of the mechanical lock rod 2.

[0034] The end of the connecting section 24 is connected to the telescopic shaft 3a of the electromagnetic push-pull rod 3 via a connecting shaft 6. The axis of the electromagnetic push-pull rod 3 is perpendicular to the bisector of the rotation angle of the mechanical lock rod 2. The two ends of the connecting shaft 6 are fixed to the charging gun body 1 by lock buckles 7 to prevent the connecting shaft from moving in the axial direction.

[0035] The electromagnetic push-pull rod 3 is fixed to the mounting base 8 by bolts, and the mounting base 8 is connected to the inner wall of the charging gun body 1;

[0036] Referring to Figures 1 and 2, a micro switch 4 is provided below the electromagnetic push-pull rod 3. The micro axis of the micro switch 4 is provided directly below the axis of the electromagnetic push-pull rod 3. The micro switch 4 is fixed to the second mounting seat 9 by bolts, and the second mounting seat 9 is fixedly connected to the first mounting seat 8. The electromagnetic push-pull rod 3 and the micro switch 4 are both connected to the charging gun body 1.

[0037] A manual emergency switch 10 is also provided on the charging gun body 1. The manual emergency switch 10 is connected to the connecting section 24 of the mechanical lock rod 2 through a flexible connector 11. The flexible connector 11 is in a relaxed state in non-emergency situations. In an emergency, the manual emergency switch 10 drives the flexible connector 11 to tighten and pull the mechanical lock rod 2 for emergency unlocking.

[0038] In this embodiment, the manual emergency switch 10 is a hand-tightened bolt, and a threaded hole 1c is provided on the charging gun body 1. The hand-tightened bolt is screwed into the charging gun body 1 through the threaded hole 1c. The flexible connector 11 is a thin steel wire rope, one end of the thin steel wire rope is connected to the hand-tightened bolt, and the other end is connected to the mechanical locking rod 2. The thin steel wire rope has excess length in the non-working state and cannot affect the action of the mechanical locking rod.

[0039] In the present invention, since the mechanical lock rod 2 rotates around the shaft as the fulcrum O, the two ends of the lock rod move in circular arcs, while the electromagnetic push-pull rod moves in a straight line. Consequently, the two trajectories do not overlap. This misalignment leads to two problems: The electromagnetic push-pull rod generates displacement and a force component along the rod direction of the mechanical lock rod during operation. This displacement along the rod direction is ineffective and increases the electromagnetic push-pull rod's resistance to movement. The force component along the rod direction is transmitted to the fulcrum, increasing the rotational resistance at the lock rod's fulcrum. These unfavorable factors reduce the effective travel and push-pull force of the electromagnetic push-pull rod. Therefore, it is necessary to minimize this effect by calculating the installation position of the electromagnetic push-pull rod.

[0040] As shown in Figure 4 , due to the influence of the installation and the internal structure of the gun body, the upper end surface of the electromagnetic push-pull rod 3 is generally lower than the position of the fulcrum O. The line connecting the upper end surface of the electromagnetic push-pull rod 3 and the fulcrum O forms an angle with the horizontal line, which is set as b. The stroke of the electromagnetic push-pull rod 3 is s. Pushing the mechanical lock rod 2 within this stroke will produce an angle, as shown in Figure 5. If the electromagnetic push-pull rod 3 is installed vertically, the angle is c; as shown in Figure 6, if the axis of the electromagnetic push-pull rod 3 is installed perpendicular to the bisector of the rotation angle of the mechanical lock rod 2, the angle is 2a. The rotation radius of the electromagnetic push-pull rod 3 when locking is set as r.

[0041] (1) Analysis from the perspective of rotation angle and invalid displacement along the rod:

[0042] Refer to Figure 6. When the axis of the electromagnetic push-pull rod 3 is installed perpendicular to the bisector of the rotation angle of the mechanical lock rod 2:

[0043] Mechanical lock rod rotation angle: 2a = 2arcsin(s / 2 / r);

[0044] Displacement of the electromagnetic push-pull rod along the locking rod direction: L = r (1-cosa).

[0045] Referring to Figure 5, when the electromagnetic push-pull rod 3 is installed vertically:

[0046] Mechanical lock rod rotation angle: c = arctan ((r*sinb+s) / (r*cosb))-b;

[0047] Displacement of the electromagnetic push-pull rod along the locking rod direction:

[0048] (2) Analyze the vertical and longitudinal forces:

[0049] Refer to Figure 6. When the axis of the electromagnetic push-pull rod 3 is installed perpendicular to the bisector of the rotation angle of the mechanical lock rod 2:

[0050] The vertical force of the electromagnetic push rod on the locking rod: F1 = F*cos a;

[0051] The electromagnetic push rod exerts a force along the locking rod: F2 = F*sin a.

[0052] Referring to Figure 5, when the electromagnetic push-pull rod 3 is installed vertically:

[0053] The vertical force of the electromagnetic push rod on the locking rod: F1'=F*cos(b+c);

[0054] The electromagnetic push rod exerts a force along the locking rod: F2'=F*sin(b+c).

[0055] In summary, after substituting the parameters of this embodiment, the actual calculation results are as follows:

[0056] The rotation radius r of the electromagnetic push-pull rod 3 when locked is 60 mm, the offset angle b is 19.5°, the electromagnetic push-pull rod stroke s is 5.5 mm, and the electromagnetic push-pull rod push-pull force F is 7 N.

[0057] Refer to Figure 6. When the axis of the electromagnetic push-pull rod 3 is installed perpendicular to the bisector of the rotation angle of the mechanical lock rod 2:

[0058] Mechanical lock rod rotation angle: 2a = 2arcsin (s / 2 / r) = 5.3°;

[0059] Displacement of the electromagnetic push-pull rod along the locking rod direction: L = r (1-cosa) = 0.06 mm;

[0060] The vertical force of the electromagnetic push rod on the locking rod is: F1 = F*cos a = 6.99N;

[0061] The force exerted by the electromagnetic push rod on the locking rod along the rod is: F2 = F*sin a = 0.3N.

[0062] Referring to Figure 5, when the electromagnetic push-pull rod 3 is installed vertically:

[0063] Mechanical lock rod rotation angle: c = arctan ((r*sinb+s) / (r*cosb)) - b = 4.79°;

[0064] The electromagnetic push-pull rod moves along the direction of the locking rod:

[0065] The vertical force of the electromagnetic push rod on the locking rod is: F1'=F*cos(b+c)=6.38N;

[0066] The electromagnetic push rod exerts a force along the locking rod: F2'=F*sin(b+c)=2.88N.

[0067] According to the above calculation results, the analysis is as follows:

[0068] When the 3-axis of the electromagnetic push-pull rod is installed perpendicular to the bisector of the rotation angle of the mechanical lock rod 2, the influence of the non-coincidence of the electromagnetic push rod 3 and the lock rod movement trajectory can be minimized, a larger rotation angle can be obtained, and the stroke of the lock hook 2a can be increased when the fulcrum is fixed; the displacement along the lock rod direction is smaller, which can effectively reduce the movement resistance caused by the displacement in this direction; a larger vertical component force can be obtained, and the holding and actuating force of the electromagnetic push-pull rod can be utilized to the greatest extent; a smaller component force along the rod can be obtained, which can reduce the rotation resistance of the fulcrum.

[0069] Through theoretical calculation and case comparison, it is found that the optimal solution for stroke force is when the axis of the electromagnetic push-pull rod 3 is installed perpendicular to the bisector of the rotation angle of the mechanical lock rod 2.

[0070] When in use, first assemble the device according to Figures 1 and 2, and reserve a certain length of thin steel wire rope so as not to affect the normal lifting and lowering of the locking rod. When the robotic arm docks with the gun seat, the electromagnetic push-pull rod 3 drops, and the corresponding lock hook 2a will lift. After the docking is completed, the electromagnetic push-pull rod 3 is lifted, the lock hook 2a drops, the gun head is locked with the socket, and the robotic arm can be separated from the gun head being charged; after charging is completed, the robotic arm docks with the gun head, the electromagnetic push-pull rod 3 drops, the lock hook 2a is lifted, and the robotic arm pulls out the gun head to complete charging. If the automatic charging device malfunctions during use and the gun head cannot be automatically pulled out, and the lock hook 2a locks the charging seat, you can unscrew the hand-tightening bolt and pull down the mechanical lock rod 2 to lift the lock hook 2a, and then manually pull out the charging gun.

[0071] The mechanical lock device of the present invention is reliably connected and can realize the functions of automatic locking and lifting. At the same time, the emergency unlocking device can be used to manually unlock the lock when the mechanical lock cannot be used normally, without affecting normal plugging and unplugging. Under the premise that the rotational movement of the lock rod and the linear movement stroke of the electromagnetic push-pull rod cannot be completely overlapped, the adverse effects are minimized to the greatest extent and the effective stroke and push-pull force of the electromagnetic push-pull rod are improved.

[0072] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present invention.

Claims

1. A mechanical lock device for an automatic charging gun head, characterized in that: The invention comprises a mechanical lock rod (2), which is hinged on a charging gun body (1), one end of which extends out of a port (1a) of the charging gun body (1) and is provided with a lock hook (2a), and the other end of which is hingedly connected to an electromagnetic push-pull rod (3), a micro switch (4) is provided below the electromagnetic push-pull rod (3), a micro axis of the micro switch (4) is provided directly below the axis of the electromagnetic push-pull rod (3), the electromagnetic push-pull rod (3) and the micro switch (4) are both connected to the charging gun body (1), and the axis of the electromagnetic push-pull rod (3) is perpendicular to the bisector of the rotation angle of the mechanical lock rod (2).

2. The mechanical lock device for the automatic charging gun head according to claim 1, characterized in that: The charging gun body (1) is provided with an installation cavity (1b), one end of the installation cavity (1b) is flush with the port (1a) of the charging gun body (1), and the mechanical locking rod (2) is arranged in the installation cavity (1b), and the size of the installation cavity (1b) meets the rotation angle requirement of the mechanical locking rod (2).

3. The mechanical lock device for the automatic charging gun head according to claim 2, characterized in that: The mechanical lock rod (2) comprises a straight section (21), a slope section (22), a bent section (23) and a connecting section (24) which are connected in sequence. One end of the straight section (21) passes through the installation cavity (1b) and extends out of the port (1a). The lock hook (2a) is arranged on one side of the straight section (21) extending out of the port (1a) and is arranged perpendicular to the straight section (21). The other side of the straight section (21) is connected to the slope section (22). The slope section (22) is inclined from the straight section (21) in a direction close to the inner wall of the charging gun body (1) and is connected to a rotating shaft (5). The bent section (23) extends from the rotating shaft (5) in a direction away from the inner wall of the charging gun body (1) and is connected to the connecting section (24). The connecting section (24) and the bent section (23) are perpendicular to each other. The end of the connecting section (24) is connected to the telescopic shaft (3a) of the electromagnetic push-pull rod (3).

4. The mechanical lock device for the automatic charging gun head according to claim 3, characterized in that: The end of the connecting section (24) is connected to the telescopic shaft (3a) of the electromagnetic push-pull rod (3) via a connecting shaft (6), and both ends of the connecting shaft (6) are fixed in the charging gun body (1) via a locking buckle (7).

5. The mechanical lock device for an automatic charging gun head according to any one of claims 1 to 4, characterized in that: The electromagnetic push-pull rod (3) is fixed to a mounting seat (8) by means of bolts, and the mounting seat (8) is connected to the inner wall of the charging gun body (1).

6. The mechanical lock device for the automatic charging gun head according to claim 5, characterized in that: The micro switch (4) is fixed to the second mounting seat (9) by means of bolts, and the second mounting seat (9) is fixedly connected to the first mounting seat (8).

7. The mechanical lock device for an automatic charging gun head according to any one of claims 1 to 4, characterized in that: The charging gun body (1) is also provided with a manual emergency switch (10), which is connected to the connecting section (24) of the mechanical lock rod (2) via a flexible connecting piece (11), and the flexible connecting piece (11) is in a relaxed state in a non-emergency situation. In an emergency situation, the manual emergency switch (10) drives the flexible connecting piece (11) to tighten and pull the mechanical lock rod (2).

8. The mechanical lock device for the automatic charging gun head according to claim 7, characterized in that: The manual emergency switch (10) is a hand-tightened bolt, a threaded hole (1c) is provided on the charging gun body (1), the hand-tightened bolt is screwed into the charging gun body (1) through the threaded hole (1c), and the flexible connecting piece (11) is a thin steel wire rope, one end of the thin steel wire rope is connected to the hand-tightened bolt, and the other end is connected to the mechanical locking rod (2).

9. An automatic charging gun head, comprising the mechanical lock device according to claims 1 to 8.

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