An automatic retracting device for a charging gun cable and its control method

Abstract

The present invention provides an automatic retracting and deploying device for a charging gun cable and its control method. By converting the tensile force acting on the steel wire rope into a pressure value acting on a pressure sensor, the rotation of the retracting and deploying brake motor is controlled according to the pressure value of the pressure sensor, thereby controlling the retracting and deploying of the steel wire rope. This device has a function of maintaining the force-bearing state, is low in cost, light in structure, convenient to install, energy-saving and safe.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission mechanisms, and in particular to an automatic retractable device for a charging gun cable and a control method thereof. Background Art

[0002] Most of the existing retractable and retractable devices use mechanical transmission mechanisms to change the mode, direction or speed of cable movement, so that the cable can be balanced during daily product installation, debugging and cargo transportation. However, these retractable and retractable devices do not achieve precise force control, resulting in uneven force application and uneven retractable and retractable speeds. If these retractable and retractable devices are used for force balancing in some common charging equipment and production lines in life, the use effect is poor, the operation is inconvenient, and the efficiency is low. Summary of the invention

[0003] In order to solve the shortcomings of the above-mentioned prior art, the present invention provides an automatic retractable device for the charging gun cable and a control method thereof. The force sensor arranged in the retractable device collects real-time force data, controls the change in the rotation speed of the retracting brake motor to realize the force balancing function, and has the functions of force balance control and force state maintenance, and has the function of rapid force balancing, so that the operator can drag or retract the wire rope connected to the charging gun with zero resistance.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an automatic cable retracting and releasing device for a charging gun, characterized in that it includes: a wire retracting and releasing brake motor, ... The position of the limiter; after the pressure sensor senses the change in the tension of the wire rope, it transmits a signal to the pressure sensor transmission module to determine whether to reel in or release the wire, and the pressure sensor transmission module transmits the reel-in signal to the reel-in brake motor drive controller, and the reel-in brake motor drive controller controls the reel-in or reel-out of the wire by controlling the forward and reverse rotation or braking of the reel-in brake motor to control the reel-in or reel-out of the wire or stop; the position sensor transmits a signal to the reel-in brake motor drive controller by detecting the position of the limiter, and the reel-in brake motor drive controller determines whether the wire rope is received in place by the position of the limiter, thereby controlling the braking of the reel-in brake motor after the wire rope is reeled in place.

[0005] Furthermore, the reducer is fixed to the first bearing fixing plate through the motor fixing plate, the first bearing fixing plate is installed on the base, and the second bearing fixing plate is also installed on the base. The second bearing fixing plate has the same specifications as the first bearing fixing plate and is parallel to each other. Through holes are opened on the first bearing fixing plate and the second bearing fixing plate. The first support bearing is installed in the through hole of the first bearing fixing plate, and the second support bearing is installed in the through hole of the second bearing fixing plate. The axes where the centers of the first support bearing and the second support bearing are located are on the same straight line.

[0006] Furthermore, the first support bearing and the second support bearing jointly support the wire-reeling shaft, and a wire-reeling wheel is installed on the part of the wire-reeling shaft between the first support bearing and the second support bearing, and a wire rope anti-winding strip is also installed between the wire-reeling wheel and the first support bearing; the part of the wire-reeling shaft extending from the first support bearing is connected to the reducer and the wire-reeling and wire-reeling brake motor.

[0007] Furthermore, the pressure sensor is installed on the base, and the base is also equipped with a pressure sensor transmitter module, a retractable wire brake motor drive controller, a first fixed pulley and a bracket, and the bracket is a groove-shaped structure that surrounds the first fixed pulley.

[0008] Furthermore, the bracket is connected to the rotating bracket through a rotating shaft and a bearing box, and a first horizontal fixed pulley, a second horizontal fixed pulley, a second fixed pulley, a third fixed pulley and a sensor fixing plate are installed on the bracket, and a position sensor is installed on the sensor fixing plate, and the position sensor is used to detect the position of the limiter.

[0009] Furthermore, the first horizontal fixed pulley and the second horizontal fixed pulley have the same specifications, are installed horizontally, and have the same height.

[0010] Furthermore, the steel wire rope extends from the take-up wheel and passes through the supporting pulley, the first fixed pulley, the first horizontal fixed pulley, the second horizontal fixed pulley, the second fixed pulley, the third fixed pulley and the stopper in sequence.

[0011] Furthermore, the height of the support pulley is adjustable. During installation, the height should be adjusted so that the angle between the steel wire ropes on both sides of the support pulley and the contact points of the support pulley in the vertical downward direction is 60°.

[0012] The control method applied to the above-mentioned charging gun cable automatic retracting and releasing device comprises the following steps:

[0013] Step 1: Power on and initialize. The position sensor detects the initial position of the limiter as the zero switch. The pressure sensor detects the pressure value as the initial force value Qg. The system records the value and waits for the charging gun signal.

[0014] Step 2: After the charging box detects the signal of pulling the charging gun, the system starts to detect the pressure value Fy of the pressure sensor;

[0015] If Fy-Qg≤0, the pressure sensor transmitter module sends a signal to the retractable wire brake motor drive controller, and the retractable wire brake motor drive controller controls the retractable wire brake motor to not open the brake, the retractable wire brake motor speed is 0, and the wire rope is not released;

[0016] If Fy-Qg>0, the pressure sensor transmitter module sends a signal to the retractable wire brake motor drive controller, and the retractable wire brake motor drive controller controls the retractable wire brake motor to open the brake to release the wire rope. The wire rope release speed V=K×(Fy-Qg), where K is the wire rope release speed gain, unit: m / (s·N);

[0017] Step 3: When the charging box issues a charging instruction, the retractable wire brake motor drive controller controls the retractable wire brake motor to close the brake, and the retractable wire brake motor is disabled and does not work;

[0018] Step 4: After the charging box sends a charging completion command, it delays for 1 second, and the retractable wire brake motor drive controller controls the retractable wire brake motor to retract the wire rope. During the process of retracting the charging gun, if: Fy-Qg>F Z , then stop collecting the gun and try to collect the gun again after a delay of 5 seconds, where: F Z For external resistance;

[0019] Step 5: During the process of retracting the charging gun, the limiter on the wire rope approaches the zero position switch at a low speed and detects the zero position switch;

[0020] Step 6: After the position sensor detects the zero switch, it sends a signal to the retractable wire brake motor drive controller. The retractable wire brake motor drive controller controls the retractable wire brake motor to stop moving, closes the brake, and disables the retractable wire brake motor, waiting for the next wire rope release instruction.

[0021] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0022] 1. The pressure sensor of the automatic cable retracting and releasing device of the charging gun of the present invention and its control algorithm is installed between the take-up wheel and the first fixed pulley, which can directly detect the pressure exerted on the wire rope when it is dragged. The structural design makes the angles of the wire ropes on both sides of the supporting point of the supporting pulley on the sensor to be 60°, ensuring that the pressure exerted on the pressure sensor is equal to the tension of the wire rope. There is no need to install a high-cost torque sensor on the rotating shaft of the motor, and only a low-cost unidirectional pressure sensor is installed, which reduces the cost.

[0023] 2. The combination of vertical pulley and horizontal pulley is adopted to realize the dragging of the wire rope in any direction within the range of ±90°.

[0024] 3. Energy saving: the motor does not work when the charging gun is charging or resetting, and the brake is closed. Only when the wire rope is retracted or released, the brake is opened and the motor is enabled to work. The motor is in a short-term working state, saving electricity and energy.

[0025] 4. Safety. The method of the present invention has a limited range for the wire rope retracting force. When the wire rope retracting force is greater than the limited range, the system stops retracting the gun, fully ensuring the personal safety of the charging gun user. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the automatic retractable device for charging gun cable and its control algorithm of the present invention.

[0027] Figure 2 It is a partial cross-sectional view of the automatic retractable device for the charging gun cable and its control algorithm of the present invention.

[0028] Figure 3 It is a schematic diagram of the overall structure of the automatic retractable device for charging gun cable and its control algorithm of the present invention.

[0029] Figure 4 It is a force-controlled balance principle diagram of the automatic retractable device for the charging gun cable of the present invention and its control algorithm.

[0030] Figure 5 It is a flow chart of the control algorithm of the automatic retractable device for the charging gun cable of the present invention.

[0031] The meanings of the accompanying drawings are as follows: 1-reel brake motor, 2-reducer, 3-motor fixing plate, 4-first bearing fixing plate, 5-wire rope anti-roll strip, 6-reel wheel, 7-second support bearing, 8-reel shaft, 9-wire rope, 10-base, 11-support pulley, 12-pressure sensor, 13-bracket, 14-rotating shaft, 15-bearing box, 16-sensor fixing plate, 17-rotating bracket, 18-pressure sensor transmission module, 19-reel brake motor drive controller, 20-first fixed pulley, 21-first horizontal fixed pulley, 22-third fixed pulley, 23-limiter, 24-position sensor, 25-second bearing fixing plate, 26-second fixed pulley, 27-second horizontal fixed pulley, 28-first support bearing. DETAILED DESCRIPTION

[0032] The scheme of the present invention is described in detail below in conjunction with the accompanying drawings:

[0033] like Figure 1 , Figure 2As shown in the figure, a first bearing fixing plate 4 and a second bearing fixing plate 25 are installed at the right end of the base 10. The first bearing fixing plate 4 and the second bearing fixing plate 25 have the same specifications and are installed along two long sides of the base 10 respectively. And the first bearing fixing plate 4 and the second bearing fixing plate 25 are parallel to each other and are both fixed at the right end of the base 10. Through holes are opened on both the first bearing fixing plate 4 and the second bearing fixing plate 25 and the axes of the through holes are on the same straight line; a first support bearing 28 is installed in the through hole of the first bearing fixing plate 4. The first support bearing 28 selects an insert bearing with spherical outside surface of model UCFL204. A second support bearing 7 is installed in the through hole of the second bearing fixing plate 25. The second support bearing 7 also selects an insert bearing with spherical outside surface of model UCFL204. A wire winding shaft 8 is installed through the first support bearing 28 and the second support bearing 7. The axis of the wire winding shaft 8 is on the same straight line as the axes of the through holes on the first bearing fixing plate 4 and the second bearing fixing plate 25. The wire winding shaft 8 penetrates through the first bearing fixing plate 4 and the second bearing fixing plate 25; a wire winding wheel is installed on the part of the wire winding shaft 8 between the first bearing fixing plate 4 and the second bearing fixing plate 25. A steel wire rope 9 is wound around the wire winding wheel 6; the part of the wire winding shaft 8 extending outwards from the first bearing fixing plate 4 is connected to a speed reducer 2. The speed reducer 2 is connected to a wire winding and unwinding brake motor 1. The speed reducer 2 is installed on the first bearing fixing plate 4 through a motor fixing plate 3; the wire winding and unwinding brake motor 1 drives the speed reducer 2. The speed reducer 2 drives the wire winding shaft 8 to drive the wire winding wheel 6 to rotate forward and backward or brake so as to realize the winding and unwinding of the steel wire rope 9.

[0034] Considering mechanical efficiency losses such as roller rotation and steel wire rope friction, motor power loss, safety factor and driving margin, and comprehensively considering motor output indicators and dimensions and weights, combined with the actual product model, the output torque of the wire winding and unwinding brake motor is selected to be 1.27 NM, and the reduction ratio of the speed reducer is 1:25. Considering the wire winding and unwinding speeds during actual use, the wire winding and unwinding brake motor 1 selects a servo motor with an output speed of 3000 revolutions per minute and a brake controller, and its model is iMH60-0133060A6CC6E.

[0035] A pressure sensor 12 is installed in the middle of the base 10. A support pulley 11 is installed on the pressure sensor 12. Considering that an eccentric moment will be generated during the dragging process of the steel wire rope 9, the pressure sensor 12 with a lateral force protection function is selected in the present invention, and its model is: SBT753Z.

[0036] A first fixed pulley 20 is installed at the left end of the base 10. The first fixed pulley is covered by a bracket 13. The bracket 13 is also fixedly installed at the left end of the base 10.

[0037] A rotating shaft 14 and a bearing box 15 are installed at one end of the top of the bracket away from the base 10. The rotating bracket 17 is connected to the bracket 13 through the rotating shaft 14, and the rotating bracket 17 can rotate horizontally.

[0038] The first horizontal fixed pulley 21 and the second horizontal fixed pulley 27 are installed on the side of the rotating bracket 17 close to the rotating shaft 14. The first horizontal fixed pulley 21 and the second horizontal fixed pulley 27 have the same specifications and are installed in parallel at the same height.

[0039] The second fixed pulley 26 and the third fixed pulley 22 are installed on the side of the rotating bracket 17 away from the rotating shaft 14 .

[0040] A position sensor 24 is also installed on the rotating bracket 17 . The position sensor 24 is installed on the sensor fixing plate 16 . The position sensor 24 is located below the second fixed pulley.

[0041] The height of the support pulley 11 is adjustable. During installation, the height should be adjusted so that the steel wire ropes on both sides of the support pulley 11 are at an angle of 60 degrees in the vertical downward direction with the contact point of the support pulley 11. The steel wire rope 9 is wound around the take-up wheel 6, and the steel wire rope 9 is pulled out from the take-up wheel, passing through the support pulley 11, the first fixed pulley 20, the first horizontal fixed pulley 21, the second horizontal fixed pulley 27, the second fixed pulley 26, the third fixed pulley 22 and the limiter 23 in sequence. In order to prevent the steel wire rope 9 from slipping out of the take-up wheel 6, a steel wire rope anti-winding strip 5 is also installed between the take-up wheel 6 and the first bearing fixing plate 4.

[0042] The base 10 is also provided with a pressure sensor transmission module 18 and a retractable wire brake motor drive controller 19. The pressure sensor 12 is connected to the analog quantity acquisition interface of the retractable wire brake motor drive controller 19 through the pressure sensor transmission module 18, and the retractable wire brake motor drive controller 19 is connected to the retractable wire brake motor 1 through the drive amplifier circuit; the retractable wire brake motor drive controller 19 module is small in size and easy to embed, supports three closed-loop control of position, speed and current, and can meet the driving and control requirements of the retractable wire motor. At the same time, the motor drive controller also supports two-channel analog quantity input, and the force analog quantity signal of the pressure sensor transmission module 18 can be connected to the port, and the force value signal of the pressure sensor 12 is read through the retractable wire brake motor drive controller 19; the working voltage of the pressure sensor transmission module 18 is optional at 12-24V, and the output signal is a 0-10V analog signal.

[0043] The present invention also provides a control method for an automatic retractable device for a charging gun cable, comprising the following steps:

[0044] Step 1: Power on and initialize. The position sensor detects the position of the limiter as the zero switch. The pressure sensor detects the pressure value. The system records the value. The pressure value detected by the pressure sensor is used as the initial force value Qg, and waits for the charging gun to pull the signal.

[0045] Step 2: After the charging box detects the signal of pulling the charging gun, the pressure sensor starts to detect the pressure value Fy;

[0046] If Fy-Qg≤0, the pressure sensor transmitter module sends a signal to the retractable wire brake motor drive controller, and the retractable wire brake motor drive controller controls the retractable wire brake motor to not open the brake, the retractable wire brake motor speed is 0, and the wire rope is not released;

[0047] If Fy-Qg>0, the pressure sensor transmitter module sends a signal to the retractable wire brake motor drive controller, and the retractable wire brake motor drive controller controls the retractable wire brake motor to open the brake to release the wire rope, and the wire rope release speed V=K×(Fy-Qg), where K is the wire rope release speed gain, unit: m / (s·N);

[0048] Step 3: When the charging box issues a charging instruction, the retractable wire brake motor drive controller controls the retractable wire brake motor to close the brake, and the retractable wire brake motor is disabled and does not work;

[0049] Step 4: After the charging box sends a charging completion command, it delays for 1 second, and the retractable wire brake motor drive controller controls the retractable wire brake motor to retract the wire rope. During the process of retracting the charging gun, if: Fy-Qg>F Z , then stop collecting the gun and try to collect the gun again after a delay of 5 seconds, where: F Z For external resistance;

[0050] Step 5: During the process of retracting the charging gun, the limiter on the wire rope approaches the zero position switch at a low speed and detects the zero position switch;

[0051] Step 6: After the position sensor detects the zero position switch, it sends a signal to the retractable wire brake motor drive controller. The retractable wire brake motor drive controller controls the retractable wire brake motor to stop moving. After the brake is closed, the retractable wire brake motor is disabled and waits for the next wire rope release instruction.

[0052] Embodiment 1:

[0053] Technical indicators in this solution: the wire rope dragging and reeling speed range is 0-550mm / s; the force balance range during wire rope dragging is 0-250N; the single-point force control accuracy is 1.0%.

[0054] Step 1: Power-on initialization. During power-on initialization, the rated speed for paying out the wire rope is set to 0.5 m / s, and the rated tension is 50 N. Then the wire rope payout speed gain K = 0.5 m / s ÷ 50 N = 0.01 m / (s·N). The value of the wire rope payout speed gain K is the ratio of the rated speed of paying out the wire rope to the rated tension. Set the external resistance F Z = 50 N, and the position sensor records the zero position of the stopper. The pressure sensor detects the pressure value. At this time, the magnitude of the pressure value detected by the pressure sensor is the same as the magnitude of the wire rope tension value, because at this time the wire rope tension originates from the gravity of the charging gun and the cable, and the wire ropes on both sides of the support pulley are at an angle of 60° with the vertical downward direction at the contact point of the support pulley. Therefore, the pressure value detected by the pressure sensor is the wire rope tension value at this time, that is, the sum of the gravity of the charging gun and the cable. Record the value of the pressure sensor at this time as the gravity value Qg. The initial gravity value Qg = 150 N (initial gravity of the charging gun + cable), and wait for the signal to pull the charging gun.

[0055] Step 2: After the charging box detects the signal of pulling the charging cable, it sends a signal to pull the charging gun to the wire rope pay-in and pay-out brake motor drive controller through RS485. The system detects that the pressure value Fy received by the pressure sensor is 180 N. Since Fy - Qg = 180 - 150 = 30 N > 0, the wire rope pay-in and pay-out brake motor drive controller sends a signal to open the brake of the wire rope pay-in and pay-out brake motor, and the wire rope payout speed V = K × (Fy - Qg) = 0.01 × 30 = 0.3 m / s.

[0056] Step 3: The charging box issues a charging in progress command, and the wire rope pay-in and pay-out brake motor drive controller sends a signal to control the wire rope pay-in and pay-out brake motor to close the brake, and the wire rope pay-in and pay-out brake motor is disabled and does not work.

[0057] Step 4: After the charging box issues a charging completion command, delay for 1 second and automatically retract the charging gun; during the process of retracting the charging gun, if the charging gun is dragged forcefully again, so that the tension value Fy measured by the pressure sensor is 220 N, Fy - Qg = 70 > F Z = 50, then stop retracting the gun, and try to retract the gun again after a 5-second delay.

[0058] Step 5: During the process of retracting the charging gun, for the stopper on the wire rope, approach the zero position switch at a low speed of 0.1 m / s, and the position sensor detects the zero position switch.

[0059] Step 6: After the position sensor detects the zero position switch, it sends a signal to the wire rope pay-in and pay-out brake motor drive controller. The wire rope pay-in and pay-out brake motor drive controller sends a signal to stop the movement of the wire rope pay-in and pay-out brake motor, close the brake, disable the motor, and wait for the next command to pay out the rope.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, several improvements or equivalent replacements can be made, and these improvements or equivalent replacements should be regarded as the protection scope of the present invention.

Claims

1. A control method for an automatic retractable device of a charging gun cable is implemented using an automatic retractable device of a charging gun cable. The automatic retractable device of the charging gun cable includes: A wire reel brake motor (1), a wire reel (6), a steel wire rope (9), a support pulley (11), a pressure sensor (12), a rotating bracket (17), a pressure sensor transmitter module (18) and a wire reel brake motor drive controller (19); the wire reel brake motor (1) drives the wire reel (6) to rotate, and the wire reel (6) retracts and releases the steel wire rope (9) wound thereon by rotating forward and reverse directions; the steel wire rope (9) extends from the wire reel (6), passes through the support pulley (11), the third fixed pulley (22) and the limiter (23); the support pulley (11) is mounted on the pressure sensor (12), and the third fixed pulley (22) is mounted on the pressure sensor (12). The wheel (22) and the limiter (23) are mounted on a rotating bracket (17), and a position sensor (24) is also mounted on the rotating bracket (17) for recording the position of the limiter (23); after the pressure sensor (12) senses the change in the tension of the wire rope (9), it transmits a signal to the pressure sensor transmission module (18) to determine whether to reel in or release the wire, and the pressure sensor transmission module (18) transmits the reel-in signal to the reel-in brake motor drive controller (19), and the reel-in brake motor drive controller (19) controls the reel-in brake motor (1) to rotate forward and reverse or brake to control the reel-in brake motor (1) to reel in or stop the wire; The position sensor (24) transmits a signal to the retractable wire brake motor drive controller (19) by detecting the position of the limiter (23). The retractable wire brake motor drive controller (19) determines whether the wire rope (9) is in place by the position of the limiter (23), thereby controlling the brake of the retractable wire brake motor (1) after the wire rope (9) is in place. The bracket (13) is connected to the rotating bracket (17) through a rotating shaft (14) and a bearing box (15); a first horizontal fixed pulley (21), a second horizontal fixed pulley (27), a second fixed pulley (26), a third fixed pulley (22) and a sensor fixing plate (16) are installed on the bracket (13); a position sensor (24) is installed on the sensor fixing plate (16); and the position sensor (24) is used to detect the position of the limiter (23); The height of the support pulley (11) is adjustable. When installing, the height should be adjusted so that the angle between the steel wire ropes (9) on both sides of the support pulley (11) and the contact points with the support pulley (11) in the vertical downward direction is 60°; The control method of the automatic retractable device for the charging gun cable is characterized by comprising the following steps: Step 1: Power on and initialize. The position sensor detects the initial position of the limiter as the zero switch. The pressure sensor detects the pressure value as the initial force value Qg. The system records the value and waits for the charging gun signal. Step 2: After the charging box detects the signal of pulling the charging gun, the system starts to detect the pressure value Fy of the pressure sensor; If Fy-Qg≤0, the pressure sensor transmitter module sends a signal to the retractable wire brake motor drive controller, and the retractable wire brake motor drive controller sends a signal to control the retractable wire brake motor to not open the brake, the retractable wire brake motor speed is 0, and the wire rope is not released; If Fy-Qg>0, the pressure sensor transmitter module sends a signal to the retractable wire brake motor drive controller, and the retractable wire brake motor drive controller sends a signal to open the retractable wire brake motor brake to release the wire rope. The wire rope release speed V=K×(Fy-Qg), where K is the wire rope release speed gain, unit: m / (s·N); Step 3: When the charging box sends a charging instruction, the retractable wire brake motor drive controller sends a signal to control the retractable wire brake motor to close the brake, and the retractable wire brake motor is disabled and does not work; Step 4: After the charging box issues a charging completion instruction, delay for 1 second, and the controller of the wire retracting and releasing brake motor sends a signal to control the wire retracting and releasing brake motor to retract the steel wire rope. During the process of retracting the charging gun, if: Fy-Qg>F Z , the gun retraction will stop, and after a 5-second delay, the gun retraction will be attempted again, where: F Z is the external resistance; Step 5: During the process of retracting the charging gun, the limiter on the wire rope approaches the zero position switch at a low speed and detects the zero position switch; Step 6: After the position sensor detects the zero position switch, it sends a signal to the retractable wire brake motor drive controller. The retractable wire brake motor drive controller sends a signal to control the retractable wire brake motor to stop moving. After the brake is closed, the retractable wire brake motor is disabled and waits for the next wire rope release instruction.

2. The control method for the automatic retractable device of the charging gun cable according to claim 1, wherein: The pressure sensor (12) is mounted on the base (10), and the base is also equipped with a pressure sensor transmitter module (18), a retractable wire brake motor drive controller (19), a first fixed pulley (20) and a bracket (13), wherein the bracket (13) is a groove-shaped structure and surrounds the first fixed pulley (20).

3. The control method for the automatic retractable device of the charging gun cable according to claim 2, wherein: The reducer (2) is fixed on the first bearing fixing plate (4) through the motor fixing plate (3); the first bearing fixing plate (4) is mounted on the base (10); a second bearing fixing plate (25) is also mounted on the base (10); the second bearing fixing plate (25) has the same specifications as the first bearing fixing plate (4) and is parallel to each other; both the first bearing fixing plate (4) and the second bearing fixing plate (25) have through holes; a first support bearing (28) is mounted on the through hole of the first bearing fixing plate (4); a second support bearing (7) is mounted on the through hole of the second bearing fixing plate (25); and the axes where the centers of the first support bearing (28) and the second support bearing (7) are located are on the same straight line.

4. The control method for the automatic retractable device of the charging gun cable according to claim 3, wherein: The first support bearing (28) and the second support bearing (7) jointly support the wire-reeling shaft (8); a wire-reeling wheel (6) is installed on the wire-reeling shaft (8) between the first support bearing (28) and the second support bearing (7); a wire rope anti-rolling strip (5) is also installed between the wire-reeling wheel (6) and the first support bearing (28); the wire-reeling shaft (8) extending from the first support bearing (28) is connected to a reducer (2) and a wire-reeling brake motor (1).

5. The control method for the automatic retractable device of the charging gun cable according to claim 4, wherein: The first horizontal fixed pulley (21) and the second horizontal fixed pulley (27) have the same specifications, are installed horizontally, and have the same height.

6. The control method for the automatic retractable device of the charging gun cable according to claim 5, wherein: The steel wire rope (9) extends from the take-up wheel (6), and passes through the support pulley (11), the first fixed pulley (20), the first horizontal fixed pulley (21), the second horizontal fixed pulley (27), the second fixed pulley (26), the third fixed pulley (22) and the stopper (23) in sequence.

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