Cable auxiliary recycling charging pile

Abstract

The invention discloses a cable auxiliary recycling charging pile, and particularly relates to the technical field of charging cabinets, the cable auxiliary recycling charging pile comprises a base, the base is provided with an auxiliary winding and unwinding assembly, the auxiliary winding and unwinding assembly comprises a charging cabinet arranged at the top of the base, the bottom of the charging cabinet is provided with a charging control chamber, and the charging control chamber is internally provided with a limiting seat. A micro air pump is triggered to supply air to an air gathering cylinder by monitoring the pulling state of a cable in real time, a spiral rib is driven by air pressure to stretch out and tightly abut against the surface of the cable, friction force between the cable and the spiral rib drives a rotating cylinder, a wire guide ring and a first gear to rotate, and the first gear rotates to drive an abutting rod to swing; and when resetting, the cable is clamped between teeth of the first gear to form one-way limiting, so that only clockwise rotation is allowed, the cable is effectively prevented from retracting due to gravity or elasticity in the pulling-out process or after stopping, accurate positioning is achieved, the redundant pulled-out cable can be recycled into the charging control chamber, and cable damage caused by cable falling is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of charging cabinets, and more specifically, to a cable-assisted recovery charging pile. Background Art

[0002] With the continuous popularization of new energy vehicles, more and more cities have planned charging piles. The charging pile can quickly charge new energy vehicles to meet the travel needs of users. The charging pile can be fixed on the ground or on the wall, installed in public buildings and parking lots or charging stations in residential areas, and can charge various models of new energy vehicles according to different voltage levels. The input end of the charging pile is directly connected to the AC power grid, and the output end is equipped with a charging plug for charging new energy vehicles.

[0003] Among them, the patent with the publication number CN222713327U discloses a charging pile, including a base, a cover body, a plugging mechanism, a connecting mechanism and an incoming line part. Among them, at least one of the connecting mechanism and the plugging mechanism is provided on the cover body, and at least the other is provided on the base, and the plugging mechanism is plugged on the connecting mechanism; the incoming line part is provided on the cover body and is electrically connected to the plugging mechanism or the connecting mechanism provided on the cover body;

[0004] When in use, the incoming line part is used to supply power to the plugging mechanism or the connecting mechanism, and then by plugging the plugging mechanism on the connecting mechanism, so that the plugging mechanism or the connecting mechanism on the cover body transfers the current to the plugging mechanism or the connecting mechanism on the base, thus avoiding a large number of cables in the charging pile, resulting in a complex wiring method in the charging pile. However, this structure is not easy to assist the cable to extend and recover during charging, which causes more cables to be drawn out and the cables to fall on the ground. Therefore, a charging pile with cable-assisted recovery is provided. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a cable-assisted recovery charging pile, aiming to solve the problems raised in the above background art.

[0006] The present invention provides the following technical solutions: a cable-assisted recovery charging pile, including a base, and an auxiliary winding and unwinding assembly is arranged on the base;

[0007] The auxiliary winding and unwinding assembly includes a charging cabinet arranged on the top of the base, a charging control room is arranged at the bottom of the charging cabinet, a limiting seat is arranged in the charging control room, a rotating cylinder is arranged in the middle of the limiting seat, a guiding cylinder is fixedly arranged at one end of the rotating cylinder, a plurality of installation grooves are opened on the inner wall of the rotating cylinder, and spiral rib strips are arranged in each of the installation grooves, and a plurality of air inlets are opened on the outer side of the rotating cylinder;

[0008] A gas collecting cylinder is provided outside the air inlet. The gas collecting cylinder is located in the middle of the limit seat. A wire ring is arranged at one end of the rotary cylinder away from the guiding cylinder. A first gear is installed outside the wire ring. A contact rod is clamped outside the first gear. A micro air pump is fixedly arranged outside the gas collecting cylinder. An electric control valve is embedded outside the limit seat. The electric control valve extends into the micro air pump and is communicated with the micro air pump. A diversion cavity is formed in the rotary cylinder and is communicated with the air inlet. The rotary cylinder is located in the gas collecting cylinder and is rotatably connected with the gas collecting cylinder. The installation groove is communicated with the diversion cavity, and the spiral rib extends into the diversion cavity. One end of the contact rod is rotatably hinged to a connection frame installed in the charging control room. An electric push rod is installed at the top of the connection frame through bolts. The output end of the connection frame is hinged to a first hinged rod. The bottom end of the first hinged rod is hinged to a second hinged rod. The second hinged rod covers the contact rod and is rotatably connected with the contact rod. A second gear is arranged at the bottom of the first gear. The second gear is meshed with the first gear, and a motor for driving the second gear to rotate is arranged on one side of the second gear;

[0009] It can be seen that in the above technical solution, when the second gear rotates, it drives the contact rod to rotate, and then enables the wire ring, the rotary cylinder and the spiral rib to rotate counterclockwise. The spiral rib rotates and contacts the outer surface of the cable to generate friction. Through the spiral cross-section of the spiral rib, the cable is pushed forward or backward along the direction of the spiral rib (i.e., the axial direction of the cable), and then the redundant cable drawn out can be recycled into the charging control room;

[0010] Optionally, in a possible implementation manner, a cable is arranged in the middle of the rotary cylinder. The shape of the spiral rib is set to be spiral, and the spiral rib abuts against the outside of the cable. One end of the cable is provided with a charging head through an electric slip ring, and an extension cylinder is slidably connected to the outside of the cable. The extension cylinder is installed outside the charging cabinet through bolts. A gun placing seat is arranged at the top of the extension cylinder. The gun placing seat is embedded in one side of the charging cabinet. A first displacement sensor is arranged at the top of the inner cavity of the gun placing seat. A second displacement sensor is arranged at one end of the extension cylinder. A vertical plate is arranged on the inner wall of the charging control room. A discharging component is arranged on one side of the vertical plate. One end of the cable is installed on the discharging component through an electric slip ring, and a frequency converter is arranged on the other side of the vertical plate. A protective plate is clamped on the charging cabinet. A control screen is embedded on the protective plate;

[0011] It can be seen that in the above technical solution, the air collecting cylinder gathers the air flow and then delivers it to the guide cavity on the rotating drum through the air inlet, and then the spiral ribs in the guide cavity extend to the middle of the rotating drum due to the pressure and contact the outside of the cable, so that the cable can contact the spiral ribs when it is pulled out, and then the spiral ribs drive the rotating drum, the wire ring and the first gear to rotate due to the friction. When the first gear rotates, it can push the resistance rod to rotate along the axis point of the connection between the resistance rod and the connecting frame, and when the resistance rod is reset, it is stuck on the outside of the first gear to limit the first gear, so that the first gear can only rotate clockwise at first, so that the cable can be positioned after it is pulled out. The cable is connected to the charging head through an electric slip ring to avoid torsional stress in the cable to drive the charging head to rotate. The cable also rebounds and resets after being transported. By controlling the rotation direction of the spiral ribs, the direction in which the cable is pushed (feeding or withdrawing) can be controlled, which is easy to recycle excess cables. The cable is also connected to the discharge assembly through an electric slip ring, which is convenient for the inverter to convert current through the discharge assembly and the electric slip ring and the cable to power the charging head.

[0012] Technical effects and advantages of the present invention:

[0013] 1. The present invention uses the second displacement sensor and the first displacement sensor to sense the micro air pump to inject air into the air collecting cylinder. The spiral ribs in the guide cavity extend to the middle of the rotating cylinder due to the pressure and contact the outside of the cable, so that the cable can contact the spiral ribs when it is pulled out. It is easy to move the contact rod when the first gear rotates, and the contact rod is convenient to reset when it is stuck on the outside of the first gear to limit the first gear, so that the first gear can only rotate clockwise at first, so as to position the cable after it is pulled out;

[0014] 2. The wire loop, the rotating drum and the spiral ribs of the present invention can rotate counterclockwise, and the spiral ribs rotate to contact the outer surface of the cable and generate friction. The spiral cross-section of the spiral ribs pushes the cable forward or backward along the direction of the spiral ribs, and then the excess cable that has been pulled out can be recovered into the charging control room;

[0015] 3. The cable of the present invention is connected to the charging head through an electric slip ring, which prevents the cable from generating torsional stress and driving the charging head to rotate. The cable also rebounds and resets after being transported. By controlling the rotation direction of the spiral ribs, the direction in which the cable is pushed can be controlled, making it easy to recycle excess cables.

[0016] 4. The electric regulating valve on the limit seat of the present invention facilitates the discharge of excess air pressure in the micro air pump, and adjusts the pressure of the spiral ribs against the cable by regulating the air pressure, thereby increasing the friction between the cable and the spiral ribs. It is also easy to block the air flow in the micro air pump, the air collecting cylinder and the rotating cylinder when the micro air pump does not supply air, so that the spiral ribs can always be against the cable, making it easy to retract the cable into the charging control room;

[0017] 5. In summary, the present invention uses a second displacement sensor and a first displacement sensor to monitor the cable pulling state in real time, triggers a micro air pump to supply air to the air collecting cylinder, the air flow enters the diversion cavity of the rotating cylinder through the air inlet, and uses air pressure to drive the spiral ribs to extend out and tightly contact the surface of the cable. The friction between the cable and the spiral ribs drives the rotation of the rotating cylinder, the wire loop and the first gear. The rotation of the first gear drives the swing of the abutting rod, and when reset, it snaps into the teeth of the first gear to form a one-way limit, allowing only clockwise rotation, effectively preventing the cable from retracting due to gravity or elastic force during or after the cable is pulled out, achieving precise positioning. The friction generated by the contact between the spiral ribs and the cable surface, combined with its spiral structure, generates a thrust along the axis of the cable, actively and smoothly recovering the excess cable pulled out into the charging control room, avoiding cable damage caused by cable drooping. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the present disclosure, the following will briefly introduce the drawings required for some embodiments. Obviously, the drawings in the following description are only the drawings of some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limitations on the actual dimensions of the products involved in the embodiments of the present disclosure, the actual processes of the methods, the actual timings of the signals, etc.

[0019] Figure 1 It is the front view of the overall structure of the present invention.

[0020] Figure 2 It is the side view of the overall structure of the present invention.

[0021] Figure 3 It is the three-dimensional view of the auxiliary cable retracting and releasing assembly of the present invention.

[0022] Figure 4 It is the schematic diagram of the limit seat, micro air pump, air collecting cylinder and electric control valve of the present invention.

[0023] Figure 5 It is the schematic diagram of the guide cylinder, first gear, wire loop and spiral ribs installed together of the present invention.

[0024] Figure 6 It is the schematic diagram of the connection frame, abutting rod, electric push rod, first hinge rod and second hinge rod of the present invention.

[0025] Figure 7 It is the schematic diagram of the rotating cylinder, guide cylinder and spiral ribs of the present invention.

[0026] Figure 8 For the present invention Figure 7 exploded view.

[0027] The accompanying drawings are marked as follows: 1. base; 2. charging cabinet; 3. charging control room; 4. limit seat; 5. rotating cylinder; 6. guide cylinder; 7. mounting groove; 8. spiral rib; 9. air inlet; 10. micro air pump; 11. air collecting cylinder; 12. electric regulating valve; 13. first gear; 14. wire ring; 15. connecting frame; 16. electric push rod; 17. first hinged rod; 18. second hinged rod; 19. resistance rod; 20. cable; 21. extension tube; 22. charging head; 23. gun holder; 24. first displacement sensor; 25. vertical plate; 26. discharge group; 27. frequency converter; 28. protective plate; 29. ​​control panel; 30. second displacement sensor; 31. second gear; 32. motor. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figures 1-8 The cable auxiliary recovery charging pile shown in the figure uses an auxiliary retractable assembly arranged on the base 1 to monitor the pulling state of the cable 20 in real time through the second displacement sensor 30 and the first displacement sensor 24, triggering the micro air pump 10 to supply air to the air collecting cylinder 11, and the air flow enters the guide cavity of the rotating drum 5 through the air inlet 9. The air pressure is used to drive the spiral ribs 8 to extend and tightly contact the surface of the cable 20. The friction between the cable 20 and the spiral ribs 8 drives the rotating drum 5, the wire ring 14 and the first gear 13 to rotate, and the first gear 13 rotates to drive the contact rod 19 to swing , and when resetting, it is stuck between the teeth of the first gear 13 to form a one-way limit to allow only clockwise rotation, effectively preventing the cable 20 from retracting due to gravity or elasticity during the extraction process or after stopping, and achieving precise positioning. The friction generated by the contact between the spiral rib 8 and the surface of the cable 20, combined with its spiral structure, generates a thrust along the axis direction of the cable 20, actively and smoothly recovering the excess cable 20 pulled out into the charging control chamber 3, avoiding damage to the cable 20 caused by the cable falling, and facilitating the recovery of the cable 20, and the specific structural arrangement of the assembly is as follows;

[0030] The auxiliary storage and release assembly includes a charging cabinet 2 arranged on the top of the base 1, a charging control room 3 is arranged at the bottom of the charging cabinet 2, a limit seat 4 is arranged in the charging control room 3, a rotating drum 5 is arranged in the middle of the limit seat 4, a guide cylinder 6 is fixedly arranged at one end of the rotating drum 5, a plurality of mounting grooves 7 are opened on the inner wall of the rotating drum 5, and spiral ribs 8 are arranged in each mounting groove 7, and a plurality of air inlets 9 are opened on the outer side of the rotating drum 5;

[0031] An air inlet cylinder 11 is provided on the outer cover of the air inlet 9. The air inlet cylinder 11 is located in the middle of the limit seat 4. One end of the rotary cylinder 5 away from the guide cylinder 6 is provided with a wire loop 14. A first gear 13 is installed on the outer side of the wire loop 14. A contact rod 19 is clamped on the outer side of the first gear 13. A micro air pump 10 is fixedly arranged on the outer side of the air inlet cylinder 11. An electric control valve 12 is embedded on the outer side of the limit seat 4. The electric control valve 12 extends into the micro air pump 10 and is communicated with the micro air pump 10. A diversion cavity is formed on the rotary cylinder 5 and is communicated with the air inlet 9. The rotary cylinder 5 is located in the air inlet cylinder 11 and is rotatably connected with the air inlet cylinder 11. The installation groove 7 is communicated with the diversion cavity, and the spiral rib 8 extends into the diversion cavity. One end of the contact rod 19 is rotatably hinged to a connection frame 15 installed in the charging control room 3. An electric push rod 16 is installed on the top of the connection frame 15 through bolts. The output end of the connection frame 15 is hinged to a first hinge rod 17. The bottom end of the first hinge rod 17 is hinged to a second hinge rod 18. The second hinge rod 18 covers the contact rod 19 and is rotatably connected with the contact rod 19. A second gear 31 is arranged at the bottom of the first gear 13. The second gear 31 meshes with the first gear 13, and a motor 32 for driving the second gear 31 to rotate is arranged on one side of the second gear 31;

[0032] A cable 20 is arranged in the middle of the rotary cylinder 5. The spiral rib 8 is arranged in a spiral shape and abuts against the outer side of the cable 20. One end of the cable 20 is provided with a charging head 22 through an electric slip ring. The outer side of the cable 20 is slidably connected with an extension cylinder 21. The extension cylinder 21 is installed on the outer side of the charging cabinet 2 through bolts. A gun placing seat 23 is arranged on the top of the extension cylinder 21. The gun placing seat 23 is embedded on one side of the charging cabinet 2. A first displacement sensor 24 is arranged on the top inner cavity of the gun placing seat 23. A second displacement sensor 30 is arranged at one end of the extension cylinder 21. A vertical plate 25 is arranged on the inner wall of the charging control room 3. A discharging component 26 is arranged on one side of the vertical plate 25. One end of the cable 20 is installed on the discharging component 26 through an electric slip ring. A frequency converter 27 is arranged on the other side of the vertical plate 25. A protection plate 28 is clamped on the charging cabinet 2. A control screen 29 is embedded on the protection plate 28.

[0033] The specific working principle is as follows. During charging, when the user pulls out the charging head 22 from the gun holder 23, the cable 20 is displaced accordingly. The second displacement sensor 30 and the first displacement sensor 24 sense that the micro air pump 10 injects air flow into the air collecting cylinder 11. After the air collecting cylinder 11 gathers the air flow, it is transported through the air inlet 9 to the diversion cavity on the rotary cylinder 5. Then, due to the pressure, the spiral ribs 8 in the diversion cavity extend to the middle of the rotary cylinder 5 and contact the outer side of the cable 20, so that when the cable 20 is pulled out, it comes into contact with the spiral ribs 8. Then, due to the friction force, the spiral ribs 8 drive the rotary cylinder 5, the wire loop 14 and the first gear 13 to rotate. When the first gear 13 rotates, it can push the contact rod 19 to rotate along the axis point where the contact rod 19 is connected to the connecting frame 15. When the contact rod 19 resets, it gets stuck outside the first gear 13 to limit the first gear 13, so that the first gear 13 can only rotate clockwise at first, which is convenient for positioning the cable 20 after it is pulled out.

[0034] At the same time, when the charging head 22 is plugged into the device to be charged, the second displacement sensor 30 detects that the cable 20 stops being pulled out. The electric push rod 16 drives the first hinge rod 17 and the second hinge rod 18 to displace, and then the contact rod 19 disengages from the first gear 13. Then, the motor 32 drives the second gear 31 to rotate. When the second gear 31 rotates, it drives the contact rod 19 to rotate, and then the wire loop 14, the rotary cylinder 5 and the spiral ribs 8 can rotate counterclockwise. When the spiral ribs 8 rotate and contact the outer surface of the cable 20, friction is generated. Through the spiral cross-section of the spiral ribs 8, the cable 20 is pushed forward or backward along the direction of the spiral ribs 8 (i.e., the axial direction of the cable), so that the extra pulled-out cable 20 can be recycled into the charging control room 3.

[0035] Furthermore, the cable 20 is connected to the charging head 22 through an electric slip ring, which avoids the cable 20 generating torsional stress and driving the charging head 22 to rotate. Also, after the cable is conveyed, it rebounds and resets. By controlling the helix direction of the spiral ribs 8, the direction in which the cable 20 is pushed (feeding or retracting) can be controlled, which is convenient for recycling the extra cable 20. And the cable 20 is also connected to the discharging component 26 through an electric slip ring, which is convenient for the frequency converter 27 to convert the current and then supply power to the charging head 22 through the discharging component 26 and the electric slip ring via the cable 20.

[0036] Furthermore, through the electric regulating valve 12 on the limit seat 4, it is convenient to discharge the excess air pressure in the micro air pump 10, and the pressure of the spiral ribs 8 against the cable 20 is adjusted by adjusting the air pressure. Then, the friction force between the cable 20 and the spiral ribs 8 is increased, and it is also easy to block the air flow in the micro air pump 10, the air collecting cylinder 11 and the rotary cylinder 5 when the micro air pump 10 does not supply air, so that the spiral ribs 8 can always contact the cable 20, which is convenient for the cable 20 to retract into the charging control room 3.

[0037] Different from the prior art, the present application discloses a cable-assisted recovery charging pile. The pulling state of the cable 20 is monitored in real time by the second displacement sensor 30 and the first displacement sensor 24, triggering the micro air pump 10 to supply air to the air collecting cylinder 11. The air flow enters the diversion cavity of the rotating cylinder 5 through the air inlet 9, and the spiral rib 8 is driven to extend out by the air pressure and tightly abuts against the surface of the cable 20. The friction force between the cable and the spiral rib 8 drives the rotating cylinder 5, the wire loop 14 and the first gear 13 to rotate. The rotation of the first gear 13 drives the abutting rod 19 to swing, and when reset, it is caught between the teeth of the first gear 13 to form a one-way limit, allowing only clockwise rotation, effectively preventing the cable 20 from retracting due to gravity or elastic retraction during or after the extraction process, achieving precise positioning. The friction force generated by the contact between the spiral rib 8 and the surface of the cable 20, combined with its spiral structure, generates a thrust along the axis direction of the cable 20, actively and smoothly recovering the excess cable 20 pulled out into the charging control room 3, avoiding damage to the cable 20 caused by the cable drooping, and also facilitating the recovery of the cable 20.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A cable-assisted recycling charging pile, comprising a base (1), characterized in that: An auxiliary retracting and deploying assembly is provided on the base (1). The auxiliary retracting and deploying assembly includes a charging cabinet (2) provided on the top of the base (1). A charging control room (3) is provided at the bottom of the charging cabinet (2). A limiting seat (4) is provided in the charging control room (3). A rotating cylinder (5) is provided in the middle of the limiting seat (4). One end of the rotating cylinder (5) is fixedly provided with a guiding cylinder (6). A plurality of mounting grooves (7) are formed in the inner wall of the rotating cylinder (5), and spiral ribs (8) are provided in each of the mounting grooves (7). A plurality of air inlets (9) are formed on the outer side of the rotating cylinder (5). A gas collecting cylinder (11) is sleeved outside the air inlet (9). The gas collecting cylinder (11) is located in the middle of the limiting seat (4). A wire ring (14) is provided at one end of the rotating cylinder (5) away from the guiding cylinder (6). A first gear (13) is installed on the outer side of the wire ring (14). A resisting rod (19) is clamped on the outer side of the first gear (13).

2. The cable-assisted recovery charging pile according to claim 1, characterized in that: A micro air pump (10) is fixedly provided on the outer side of the gas collecting cylinder (11). An electric control valve (12) is embedded on the outer side of the limiting seat (4). The electric control valve (12) extends into the micro air pump (10) and is communicated with the micro air pump (10).

3. The cable-assisted recovery charging pile according to claim 1, characterized in that: A diversion cavity is formed on the rotating cylinder (5), and the diversion cavity is communicated with the air inlet (9). The rotating cylinder (5) is located in the gas collecting cylinder (11) and is rotatably connected with the gas collecting cylinder (11). The mounting groove (7) is communicated with the diversion cavity, and the spiral rib (8) extends into the diversion cavity.

4. The cable-assisted recovery charging pile according to claim 1, wherein: One end of the resisting rod (19) is rotatably hinged to a connecting frame (15) installed in the charging control room (3). An electric push rod (16) is installed at the top of the connecting frame (15) through bolts. The output end of the connecting frame (15) is hinged to a first hinged rod (17).

5. The cable-assisted recovery charging pile according to claim 4, wherein: The bottom end of the first hinged rod (17) is hinged to a second hinged rod (18). The second hinged rod (18) is sleeved on the resisting rod (19) and is rotatably connected with the resisting rod (19).

6. The cable-assisted recycling charging pile according to claim 1, wherein: A cable (20) is provided in the middle of the rotating cylinder (5). The shape of the spiral rib (8) is spiral, and the spiral rib (8) abuts against the outer side of the cable (20). One end of the cable (20) is provided with a charging head (22) through an electric slip ring, and an extension cylinder (21) is slidably connected to the outer side of the cable (20).

7. The cable-assisted recycling charging pile according to claim 6, wherein: The extension cylinder (21) is installed on the outer side of the charging cabinet (2) through bolts. A gun placing seat (23) is provided at the top of the extension cylinder (21). The gun placing seat (23) is embedded on one side of the charging cabinet (2). A first displacement sensor (24) is provided at the top of the inner cavity of the gun placing seat (23). A second displacement sensor (30) is provided at one end of the extension cylinder (21).

8. The cable-assisted recycling charging pile according to claim 6, characterized in that: A vertical plate (25) is provided on the inner wall of the charging control room (3). A discharging assembly (26) is provided on one side of the vertical plate (25). One end of the cable (20) is installed on the discharging assembly (26) through an electric slip ring, and a frequency converter (27) is provided on the other side of the vertical plate (25).

9. The cable-assisted recovery charging pile according to claim 1, wherein: A protection plate (28) is snap-connected to the charging cabinet (2), and a control panel (29) is embedded in the protection plate (28).

10. The cable-assisted recovery charging pile according to claim 1, wherein: A second gear (31) is provided at the bottom of the first gear (13). The second gear (31) meshes with the first gear (13), and a motor (32) for driving the second gear (31) to rotate is provided on one side of the second gear (31).

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