阅读说明：本技术 电动支脚及电动支脚控制方法 (Electric stand bar and electric stand bar control method ) 是由 林炳城 薛金梁 冯伟炎 曹小雄 杨安明 于 2021-01-27 设计创作，主要内容包括：本发明揭示了一种电动支脚及电动支脚控制方法,电动支脚包括电机、变速箱、伸缩支脚和控制系统；电机与车头的电池或半挂车的电池电连接；变速箱输入端与电机传动连接；伸缩支脚与变速箱的输出端传动连接,变速箱的输出端带动伸缩支脚伸长或缩短；控制系统与电机电连接,控制电机。电机通过变速箱减速,带动伸缩支脚,使伸缩支脚伸长或缩短,通过伸缩支脚伸长使电动支脚的下端接触支承面以顶升起半挂车,电动支脚的电机与车头的电池或半挂车的电池电连接,能够支持更大功率的电机工作,电机可以提供更大的扭矩,作用于伸缩支脚的动能更强,支持伸缩支脚采用更加快速的伸缩结构,提高电动支脚的工作效率,而且采用电机作为动力,工作效率更高。(The invention discloses an electric support leg and an electric support leg control method, wherein the electric support leg comprises a motor, a gearbox, a telescopic support leg and a control system; the motor is electrically connected with a battery of the vehicle head or a battery of the semitrailer; the input end of the gearbox is in transmission connection with the motor; the telescopic support legs are in transmission connection with the output end of the gearbox, and the output end of the gearbox drives the telescopic support legs to extend or shorten; the control system is electrically connected with the motor and controls the motor. The motor passes through the gearbox and slows down, drive flexible stabilizer blade, make flexible stabilizer blade extension or shorten, the lower extreme contact bearing surface that makes electronic stabilizer blade through flexible stabilizer blade extension plays the semitrailer with the jacking, the motor of electronic stabilizer blade is connected with the battery electricity of the battery of locomotive or the semitrailer, can support more powerful motor work, the motor can provide bigger moment of torsion, the kinetic energy that acts on flexible stabilizer blade is stronger, support flexible stabilizer blade and adopt faster extending structure, the work efficiency of electronic stabilizer blade is improved, and adopt the motor as power, work efficiency is higher.)

1. An electric foot, comprising:

the motor is electrically connected with a battery of the vehicle head or a battery of the semitrailer;

the input end of the gearbox is in transmission connection with the motor;

the telescopic supporting leg is in transmission connection with the output end of the gearbox, and the output end of the gearbox drives the telescopic supporting leg to extend or shorten;

and the control system is electrically connected with the motor and used for controlling the motor.

2. The motorized foot according to claim 1, characterised in that the power of said motor is greater than 500W.

3. The motorized foot according to claim 1, characterised in that said gearbox comprises:

the first gear is in transmission connection with the output end of the motor;

the second gear is in transmission connection with the telescopic supporting leg;

the first gear is engaged with the second gear, and the number of teeth of the first gear is less than that of the second gear.

4. The motorized foot according to claim 3, characterised in that said gearbox further comprises:

the third gear is in coaxial transmission connection with the first gear;

a fourth gear engaged with the third gear;

the torsion piece is in coaxial transmission connection with the fourth gear;

the number of teeth of the fourth gear is greater than that of the third gear.

5. The motorized foot according to claim 4, characterised in that said third gear and said first gear constitute an integral two-stage gear.

6. The motorized foot according to claim 4, characterised in that said torsion element and said fourth gear are connected in one piece.

7. The motorized foot according to claim 1, characterised in that said telescopic foot comprises:

the first bevel gear is in transmission connection with the output end of the gearbox;

a second bevel gear engaged with the first bevel gear;

the lower part of the transmission rod is provided with a screw rod, the upper end of the transmission rod is fixedly connected with the second bevel gear, and the transmission rod is used for coaxial transmission of the second bevel gear;

the fixed table piece is rotatably connected with the upper part of the transmission rod and used for limiting the transmission rod to move up and down;

the supporting legs are in threaded connection with the lower part of the transmission rod;

the guide post is connected with the support leg in a sliding mode along the axial direction of the support leg, and the guide post limits the support leg to move in the circumferential direction.

8. The powered foot according to claim 7, characterized in that the telescopic foot further comprises:

the first detection device is arranged on the fixed table piece and used for detecting whether the supporting leg rises to a set height or not;

the second detection device is arranged on the fixed table piece and used for detecting the pressure applied to the fixed table piece;

the third detection device is in transmission connection with the first bevel gear and is used for detecting the number of rotation turns of the first bevel gear;

the first detection device, the second detection device and the third detection device are in communication connection with the control system.

9. The motorized foot according to claim 1, further comprising:

and the wireless communication module is in communication connection with the control system.

10. An electric foot control method, characterized by being applied to the electric foot of any one of claims 1-9, comprising the steps of:

the control system receives control signals, wherein the control signals comprise an extension signal representing the extension of the electric supporting foot or a shortening signal representing the shortening of the electric supporting foot, the extension signal is generated before the head of the semitrailer is replaced, and the shortening signal is generated after the head of the semitrailer is replaced;

recognizing the control signal and controlling the motor to rotate according to the control signal;

judging whether a termination signal is received, wherein the termination signal is generated when the electric supporting leg is extended to a set length and shortened to the shortest length;

and if so, controlling the motor to stop rotating.

Technical Field

The invention relates to the field of electric supporting legs, in particular to an electric supporting leg and a control method of the electric supporting leg.

Background

The semitrailer of the tractor comprises legs for supporting the front part of the semitrailer when disconnected from the truck, which legs are shortened for driving on the road when the semitrailer is connected to the vehicle head. Conversely, before the head is detached from the semitrailer, the support leg legs are extended to contact the supporting surface to lift the semitrailer; the extension and the shortening of the prior support legs are controlled by a hand-operated mode, which wastes time and labor, is inconvenient to operate and has low efficiency.

Disclosure of Invention

The invention mainly aims to provide an electric support leg and an electric support leg control method, and aims to solve the problem that the conventional support leg is low in efficiency through manual expansion and contraction.

The invention provides an electric supporting leg, comprising:

the motor is electrically connected with a battery of the vehicle head or a battery of the semitrailer;

the input end of the gearbox is in transmission connection with the motor;

the telescopic support leg is in transmission connection with the output end of the gearbox, and the output end of the gearbox drives the telescopic support leg to extend or shorten;

and the control system is electrically connected with the motor and used for controlling the motor.

Further, the power of the motor is more than 500W.

Further, the transmission includes:

the first gear is in transmission connection with the output end of the motor;

the second gear is in transmission connection with the telescopic support leg;

the first gear is engaged with the second gear, and the number of teeth of the first gear is less than that of the second gear.

Further, the transmission case further includes:

the third gear is in coaxial transmission connection with the first gear;

a fourth gear engaged with the third gear;

the torsion piece is in coaxial transmission connection with the fourth gear;

the number of teeth of the fourth gear is greater than that of the third gear.

Further, the third gear and the first gear constitute an integrated secondary gear.

Further, the torsion member and the fourth gear are connected as a single body.

Further, the telescopic leg comprises:

the first bevel gear is in transmission connection with the output end of the gearbox;

a second bevel gear engaged with the first bevel gear;

the lower part of the transmission rod is provided with a screw rod, the upper end of the transmission rod is fixedly connected with a second bevel gear, and the second bevel gear of the transmission rod is coaxially driven;

the fixed table piece is rotatably connected with the upper part of the transmission rod and used for limiting the transmission rod to move up and down;

the supporting legs are in threaded connection with the lower part of the transmission rod;

and the guide post is connected with the support leg in a sliding mode along the axial direction of the support leg, and the guide post limits the support leg to move in the circumferential direction.

Further, the telescopic leg further comprises:

the first detection device is arranged on the fixed table piece and used for detecting whether the supporting leg rises to a set height or not;

the second detection device is arranged on the fixed table piece and used for detecting the pressure applied to the fixed table piece;

the third detection device is in transmission connection with the first bevel gear and is used for detecting the number of rotation turns of the first bevel gear;

the first detection device, the second detection device and the third detection device are in communication connection with the control system.

Further, the electric foot further comprises:

and the wireless communication module is in communication connection with the control system.

The invention also provides an electric supporting leg control method, which is applied to the electric supporting leg and comprises the following steps:

the control system receives control signals, the control signals comprise extension signals representing the extension of the electric supporting feet or shortening signals representing the shortening of the electric supporting feet, the extension signals are generated before the head of the semitrailer is replaced, and the shortening signals are generated after the head of the semitrailer is replaced;

identifying a control signal and controlling the motor to rotate according to the control signal;

judging whether a termination signal is received, wherein the termination signal is generated when the electric supporting leg is extended to a set length and shortened to the shortest length;

if yes, the motor is controlled to stop rotating.

The invention provides an electric support leg and an electric support leg control method.

Drawings

FIG. 1 is a schematic diagram of an internal structure of an embodiment of an electric foot according to the present invention;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

FIG. 3 is a schematic structural diagram of an embodiment of the electric foot according to the present invention;

FIG. 4 is a schematic diagram of a connection structure of a control system in an embodiment of the electric stand bar of the present invention;

FIG. 5 is a schematic diagram of steps of an embodiment of a method for controlling an electric stand bar according to the present invention.

The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood by those skilled in the art that, as used herein, the singular forms "a", "an", "the" and "the" may include the plural forms as well, unless expressly stated otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, units, modules, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Referring to fig. 1-5, an embodiment of the electric supporting leg of the present invention includes a motor 1, a transmission case 2, a telescopic supporting leg 3 and a control system 4; the motor 1 is electrically connected with a battery of a vehicle head or a battery of a semitrailer; the input end of the gearbox 2 is in transmission connection with the motor 1; the telescopic support legs 3 are in transmission connection with the output end of the gearbox 2, and the output end of the gearbox 2 drives the telescopic support legs 3 to extend or shorten; the control system 4 is electrically connected with the motor 1 and used for controlling the motor 1.

Specifically, the motor 1 is decelerated through the gearbox 2 to drive the telescopic support legs 3 to extend or shorten the telescopic support legs 3, the lower ends of the electric support legs are contacted with a supporting surface through the extension of the telescopic support legs 3 to jack up the semi-trailer, the motor 1 of the electric support legs is electrically connected with a battery of a vehicle head or a battery of the semi-trailer, the motor 1 with larger power can be supported to work, the motor 1 can provide larger torque, the kinetic energy acting on the telescopic support legs 3 is stronger, the telescopic support legs 3 are supported to adopt a faster telescopic structure, the working efficiency of the electric support legs is improved, the motor 1 is adopted as power, the working efficiency is higher, and the labor is saved; it should be noted that the control system 4 controls the extension or contraction of the electric legs by controlling the motor 1; in some embodiments, the user sends commands to the control system 4 via the keys 6 on the powered legs, and in some embodiments, the user may send control commands to the control system 4 remotely via a device of a remote control, such as a user controlling the powered legs via the remote control in the cab of the locomotive.

Further, in some embodiments, the power of the motor 1 is greater than 500W. For example, the motor 1 has a power of 550W, 750W, 1.1KW, 1.5KW, 2.2KW, 3KW, 4KW, 5.5KW, 7.5KW, 11KW, 15KW, 18.5KW, 22KW, 30KW, 37KW, 45KW, 55KW, 75KW, 90KW, 110KW, 132KW, 160KW, 200KW, 220KW, 250KW, 280KW, 315KW or the like; high power motor 1 the motor 1 can provide a larger torque.

Further, in some embodiments, the gearbox 2 comprises a first gear 21 and a second gear 22; the first gear 21 is in transmission connection with the output end of the motor 1; the second gear 22 is in transmission connection with the telescopic supporting leg 3; the first gear 21 meshes with the second gear 22, and the number of teeth of the first gear 21 is smaller than that of the second gear 22.

Specifically, the motor 1 drives the first gear 21 to rotate, the first gear 21 drives the second gear 22 engaged therewith to rotate, and when the second gear 22 rotates, power is provided for the extension and retraction of the telescopic supporting leg 3, for example, when the motor 1 rotates forward, the telescopic supporting leg 3 extends, and when the motor 1 rotates backward, the telescopic supporting leg 3 shortens.

Further, in some embodiments, the gearbox 2 further comprises a third gear 23, a fourth gear 24 and a torque element 25; the third gear 23 is in coaxial transmission connection with the first gear 21; the fourth gear 24 meshes with the third gear 23; the torsion element 25 is in coaxial transmission connection with the fourth gear 24; the number of gear teeth of the fourth gear 24 is larger than that of the third gear 23.

Specifically, when the first gear 21 rotates, the coaxial third gear 23 is driven to rotate, and further the fourth gear 24 and the torsion member 25 are driven to rotate, and the third gear 23, the fourth gear 24 and the torsion member 25 do not hinder the first gear 21 from rotating; when the motor 1 fails or cannot normally supply power, so that the motor 1 cannot normally work, the handle can drive the torsion piece 25 to rotate, and then the fourth gear 24, the third gear 23, the first gear 21 and the second gear 22 are sequentially driven, so that the electric support legs are manually controlled to stretch; it should be noted that in some embodiments, the electric leg is provided with a mounting structure for placing the handle, and the handle is fixed by the mounting structure to prevent the handle from being lost.

It should be noted that in some embodiments, the ratio of the number of teeth of the fourth gear 24 to the number of teeth of the third gear 23 is larger than the ratio of the number of teeth of the second gear 22 to the number of teeth of the first gear 21, so that the user can control the extension or the contraction of the power foot through the handle more rapidly.

It should be noted that in some embodiments, the insertion opening 53 of the communicating torsion member 25 is provided with a protective cover for covering the insertion opening 53 when the handle is not needed, so as to prevent accidental injury caused by hand insertion; in some embodiments, the protective cover is screwed into the insertion port 53; in some embodiments, the protective cover is hinged at the side of the insertion opening 53, the user covers the insertion opening 53, and a clamping structure is arranged to clamp the protective cover to prevent the protective cover from deviating when the protective cover covers the insertion opening 53, so as to play a role of continuous protection, and when the handle needs to be inserted, the protective cover is uncovered and clamped at another position, so as to prevent the protective cover from influencing the rotation of the handle; it should be noted that in some embodiments, the state of the protective cover is defined by the magnet attracting the protective cover.

Further, in some embodiments, the third gear 23 and the first gear 21 constitute an integral two-stage gear. The integrated secondary gear is stable in structure, can bear high strength and is long in service life.

Further, in some embodiments, the torque element 25 and the fourth gear 24 are integrally connected. Specifically, the torsion member 25 is provided on the rotation shaft of the fourth gear 24.

Further, in some embodiments, the torque element 25 is provided with a hexagonal blind hole coaxial with the fourth gear 24. Correspondingly, the end of the handle for inserting the torsion piece 25 is a hexagonal prism shape, and the hexagon can bear larger acting force, so that the handle can stably drive the torsion piece 25, and further drive the electric support leg to extend or shorten.

Further, in some embodiments, the telescopic leg 3 comprises a first bevel gear 31, a second bevel gear 32, a transmission rod 33, a fixed stage 34, a leg 35 and a guide post 36; the first bevel gear 31 is in transmission connection with the output end of the gearbox 2; the second bevel gear 32 is meshed with the first bevel gear 31; the lower part of the transmission rod 33 is a screw rod, the upper end of the transmission rod 33 is fixedly connected with the second bevel gear 32, and the transmission rod 33 is coaxially driven by the second bevel gear 32; a fixed table member 34 is rotatably connected to an upper portion of the driving rod 33 for restricting the driving rod 33 to move up and down; the supporting legs 35 are in threaded connection with the lower part of the transmission rod 33; the guide post 36 is slidably connected with the leg 35 along the axial direction of the leg 35, and the guide post 36 limits the leg 35 to move in the circumferential direction.

Specifically, the second gear 22 is in transmission connection with the first bevel gear 31, the second gear 22 drives the first bevel gear 31 to rotate, and then the second bevel gear 32 electrically engaged with the first bevel gear 31 rotates, and further drives the transmission rod 33 to rotate; when the transmission rod 33 rotates, the transmission rod 33 can only rotate circumferentially and cannot move up and down due to the limitation of the fixed table member 34; the support leg 35 is in threaded connection with the lower portion of the transmission rod 33, the guide post 36 is in sliding connection with the support leg 35 along the axial direction of the support leg 35, the guide post 36 limits the support leg 35 to move in the circumferential direction, when the transmission rod 33 rotates, the support leg 35 and the transmission rod 33 generate relative displacement along the axial direction of the transmission rod 33, namely relative displacement in the up-down direction, and therefore length change of the electric support leg is achieved; and because the drive link 33 is connected with the whorl of the leg support 35, when the drive link 33 does not rotate, receive the great pressure, can not produce the relative displacement of the axial either, suitable for supporting the heavier object such as semitrailer.

It should be noted that in some embodiments, the upper end of the transmission rod 33 passes through the fixed platform 34 and is connected to the second bevel gear 32 by a connecting pin passing transversely through the upper end of the transmission rod 33, the upper portion of the transmission rod 33 is coaxially stepped, the diameter of the upper end is smaller, the step abuts against the fixed platform 34 to prevent the transmission rod 33 from moving upwards, and the second bevel gear 32 is connected to the transmission rod 33 above the fixed platform 34 to limit the transmission rod 33 from moving downwards.

It should be mentioned that, in some embodiments, the housing 5 of the telescopic leg 3 is provided with two side wings 51 in order to bear a larger pressure, the side wings 51 are provided with a plurality of connecting holes 52, the housing 5 is fixed on an object which can be supported by the semitrailer by passing a screw through the connecting holes 52, and the fixed table member 34 is fixedly connected with the housing 5, so that the fixed table member 34 can bear the push of the transmission rod 33 without moving.

It should be said that, in some embodiments, because the motor 1 is electrically connected with the battery of the locomotive or the battery of the semitrailer, can support the work of the more powerful motor 1, the motor 1 can provide bigger moment of torsion, and the number of teeth of the wheel of the first helical gear 31 can be greater than the number of teeth of the wheel of the second helical gear 32, can make the faster rotation of the second helical gear 32, improves the extension and shortening speed of the electric supporting foot, and improves the work efficiency of the electric supporting foot.

Further, in some embodiments, the telescopic leg 3 further comprises a first detecting means 37, a second detecting means 38 and a third detecting means 39; the first detection device 37 is arranged on the fixed table piece 34 and used for detecting whether the supporting leg 35 rises to a set height; the second detection device 38 is arranged on the fixed table member 34 and is used for detecting the pressure applied to the fixed table member 34; the third detecting device 39 is in transmission connection with the first bevel gear 31 and is used for detecting the number of rotation turns of the first bevel gear 31; the first, second and third detection devices 37, 38, 39 are communicatively connected to the control system 4.

Specifically, whether the supporting legs 35 rise to the set height can be detected through the first detection device 37, when the supporting legs 35 rise to the set height is detected, the control system 4 controls the motor 1 to stop working, the supporting legs 35 stop rising, and the electric supporting legs are shortened to the set shortest length range, so that the electric supporting legs can be prevented from obstructing the movement of the tractor; it should be noted that in some embodiments, the first detecting device 37 may be a small pressure sensor, and when the leg 35 is raised to the set height, the first detecting device 37 is touched, so as to determine that the leg 35 is raised to the set height, and the detecting end of the small pressure sensor is retractable, so as to leave a buffer space for the leg 35 to rise during the data processing of the control system 4; in some embodiments, the first detecting device 37 is an infrared detecting device, and detects the distance from the upper end surface of the leg 35 to determine whether the leg 35 is raised to a set height.

When the supporting leg contacts the supporting surface, a counterforce is exerted on the fixed table piece 34, the second detection device 38 is a pressure sensor, whether the supporting leg contacts the ground is judged by detecting the pressure applied to the fixed table piece 34 through the second detection device 38, when the second detection device 38 detects that the pressure applied to the fixed table piece 34 reaches a set value, the lower end of the supporting leg can be judged to contact the supporting surface, the electric supporting leg does not need to extend continuously, and the control system 4 controls the motor 1 to stop working; however, the second detecting means 38 is only used to cause erroneous judgment when the lower supporting surface is too soft, and the electric legs need to have the longest length from the viewpoint of safety, and the electric legs need to be stopped from extending when the electric legs reach the longest length.

The third detecting device 39 detects the number of rotation turns of the first helical gear 31, and then can determine whether the electric supporting foot extends to the longest length through the number of rotation turns of the first helical gear 31, if so, the control system 4 controls the motor 1 to stop working.

It should be noted that in some embodiments, the guide post 36 is provided with a lower limit mechanism that gives a distinct feeling of stagnation when the powered foot is extended to the longest length when the handle is manually rocked, for alerting the user; in this embodiment, the lower limiting mechanism may include a spring and a pin disposed on the guiding post 36, the spring presses against the pin toward the supporting leg 35, a pit is disposed on the supporting leg 35, and when the electric supporting leg extends to the longest length, the pin is inserted into the pit.

It should be said that, in some embodiments, the electronic stabilizer blade still includes warning light and/or bee calling organ, and in electronic stabilizer blade extension in-process, the warning light can twinkle, and bee calling organ can send the prompt tone, reminds the user not to put the foot in the lower extreme of stabilizer blade, protects user's safety.

It should be noted that in some embodiments, the powered foot further comprises an illumination light for illuminating the powered foot and also the vicinity to prevent a user from being unable to tell in a dark environment whether the foot is at the lower end of the foot.

Further, in some embodiments, the powered foot further comprises a wireless communication module 7; the wireless communication module 7 is in communication connection with the control system 4. The wireless communication module 7 can receive or send wireless signals, so that a user can conveniently and remotely control the electric supporting leg and monitor the working state of the electric supporting leg.

Referring to fig. 5, the present invention further provides an electric stand bar control method, which is applied to the electric stand bar and includes the following steps:

s1, the control system receives control signals, the control signals comprise extension signals representing the extension of the electric supporting legs or shortening signals representing the shortening of the electric supporting legs, the extension signals are generated before the head of the semitrailer is replaced, and the shortening signals are generated after the head of the semitrailer is replaced;

s2, identifying a control signal and controlling the motor to rotate according to the control signal;

s3, judging whether a termination signal is received, wherein the termination signal is generated when the electric support leg is extended to a set length and shortened to the shortest length;

and S4, if yes, controlling the motor to stop rotating.

In the step S1, the extension signal may be generated by a user through manual control, for example, by pressing an extension button on the electric supporting leg or by sending it through a remote controller, or may be generated automatically when the user starts to replace the vehicle head, because of the rapid extension of the electric supporting leg, when the electric supporting leg extends to a set length, the electric supporting leg is fed back to the user, and the user can completely separate the vehicle head from the semi-trailer; after the head of the user is connected with the semitrailer, the shortening signal is generated through manual control of the user, for example, a shortening key on the electric supporting leg is pressed or the shortening signal is sent out through a remote controller, or the shortening signal can be generated automatically after the head of the user is replaced.

In step S2, the control system recognizes the control signal, and then determines whether the control signal is an extension signal or a contraction signal; in the embodiment, when the control signal is an extension signal, the motor is controlled to rotate forwards according to the setting, and when the control signal is a shortening signal, the motor is controlled to rotate backwards according to the setting; the specific situation is determined according to the actual situation of the electric supporting leg; for example, in some embodiments, the motor is controlled to rotate in reverse according to a setting when the control signal is an extend signal and to rotate in forward according to a setting when the control signal is a shorten signal.

In the above step S3, the termination signal is generated when the power leg is extended to the set length and shortened to the shortest length; the set length can be the maximum length of the electric supporting leg, and can also be the extensible maximum length judged by the electric supporting leg, for example, a stone is padded below the electric supporting leg, and the extensible maximum length judged by the electric supporting leg can be shorter than the maximum length of the electric supporting leg.

In step S4, the length change of the electric legs can be stopped by controlling the motor to stop rotating, and the tractor can perform other operations, for example, the tractor can move after the electric legs are shortened to the shortest; after the extended length of the electric support legs reaches the set length, the head of the tractor can be separated from the semitrailer; if no termination signal is received, it means that the length change of the powered leg does not need to be terminated.

The invention provides an electric support leg and an electric support leg control method.A motor 1 of the electric support leg is electrically connected with a battery of a vehicle head or a battery of a semitrailer, so that the motor 1 with higher power can be supported to work, the motor 1 can provide higher torque, the kinetic energy acting on a telescopic support leg 3 is stronger, the telescopic support leg 3 is supported to adopt a faster telescopic structure, the working efficiency of the electric support leg is improved, and the motor 1 is adopted as power, so that the working efficiency is higher, and the labor is saved.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.