Aerial power transmission device and pay-out speed adjustment method

Abstract

This invention relates to a suspended power transmission device and a method for adjusting the speed of cable winding and unwinding, comprising a power supply tower (1), a receiving tower (2), and a cable (3); the power supply tower (1) is fixed on the ground and has a cable reel (1-111) at its bottom, the receiving tower (2) is located on the top of the engineering machinery, and the cable (3) wound on the cable reel (1-111) passes through the top of the power supply tower (1) and is connected to the receiving tower (2) on the top of each engineering machinery; the location of the power supply cable to the engineering machinery is changed from the traditional ground to the air access, and through the rotatable and height-adjustable power supply tower, the wire can be wound and unwound freely in sync with the engineering machinery, reducing the risk of leakage due to cable wear.

Description

Technical Field

[0001] This invention relates to the technical field of power transmission devices, and specifically to a suspended power transmission device and a method for adjusting the speed of wire take-up and release. Background Technology

[0002] Traditional construction machinery, such as excavators and loaders, generally burn diesel fuel, which has the disadvantage of high pollution. Due to increasingly stringent national environmental protection requirements, advancements in new energy technologies, significant energy-saving and emission-reduction economic benefits, and enhanced adaptability to various working conditions, the popularization of electrification in construction machinery has been promoted.

[0003] In fields such as large excavators and electric shovels, due to the high power consumption of a single device, the immaturity of battery energy storage technology, and the fixed nature of the equipment, an external cable is usually used to ensure continuous power supply to the construction machinery, thus guaranteeing its continuous operation.

[0004] However, due to the frequent movement and turning of construction machinery during operation, the cables are dragged and rubbed against the ground, posing a risk of high-voltage cable abrasion. To prevent the equipment from crushing the cables, workers usually follow behind the equipment to drag the cables, which not only increases labor costs but also poses a risk of injury or death due to the high voltage of the cables and the resulting cable abrasion.

[0005] Therefore, there is an urgent need to provide corresponding solutions to address the aforementioned defects and shortcomings. Summary of the Invention

[0006] In order to overcome the defects and shortcomings of the existing technology, the present invention provides a suspended power transmission device and a method for adjusting the speed of wire winding and unwinding.

[0007] The technical solution provided by the present invention is as follows: a suspended power transmission device, the suspended power transmission device includes a power supply tower (1), a receiving tower (2), and a cable (3); the power supply tower (1) is fixed on the ground and a cable reel (1-111) is provided at the bottom; the receiving tower (2) is provided on the top of the engineering machinery; the cable (3) wound on the cable reel (1-111) passes through the top of the power supply tower (1) and is correspondingly connected to the receiving tower (2) on the top of each engineering machinery.

[0008] Furthermore, the power supply tower (1) includes a tower body (1-1) fixed to the ground and a cantilever (1-2) located at the top of the tower body (1-1). The middle part of the cantilever (1-2) is hinged to the top of the tower body (1-1) through a pivot (1-3), and a limit device is provided at the hinge position.

[0009] Furthermore, the tower body (1-1) includes several tower body modules (1-11), and adjacent tower body modules (1-11) are connected by a tower body slewing support device (1-12) to realize relative rotational movement between adjacent tower body modules (1-11).

[0010] Furthermore, the cantilever (1-2) includes several cantilever modules (1-21), and adjacent cantilever modules (1-21) are connected by a cantilever slewing support device (1-32) to realize relative rotational movement between adjacent cantilever modules (1-21).

[0011] Furthermore, one end of the cantilever (1-2) is connected to a cable (3), and the other end of the cantilever (1-2) is equipped with a counterweight (1-21).

[0012] Furthermore, the receiving tower (2) includes a tower body (2-1), the bottom of which is rotatably supported on the top of the engineering machinery by a tower body rotation support device (2-2); a collector ring (2-3) is provided at the bottom of the tower body (2-1).

[0013] Furthermore, an angle sensor is installed on the cantilever (1-2) to detect and provide feedback on the angle between the cantilever (1-2) and the tower body (1-1) in real time, and to control the speed of cable winding and unwinding of the cable reel (1-111) according to the size of the angle.

[0014] Furthermore, it includes the following steps:

[0015] S1. Calculate the rotational speed V of the motor driving the cable reel based on the desired cantilever angle α;

[0016] S2. The input data are the angle α between the tower body and the cantilever, and the difference between the target speed and the current speed. The speed correction value △V is output based on the PI control module.

[0017] S3. Divide the motor speed value and the motor speed difference value into several motor speed ranges and motor speed difference ranges;

[0018] S4. Calibrate and store the position values ​​of the different motor speed difference intervals under the end values ​​of each motor speed interval;

[0019] S5. Determine the corresponding angle value based on the current motor speed, the motor speed difference range, and the motor speed difference range;

[0020] S6. Directly read the motor speed at the current moment;

[0021] S7, the speed value V, and the speed correction value △V constitute the motor's speed output value.

[0022] Furthermore, the receiving tower (2) is equipped with a position sensor to detect and provide feedback on the position of the engineering machinery in real time; the cable reel (1-111) is equipped with a motor controller, which adjusts the cable winding and unwinding speed of the cable reel according to the distance of the engineering machinery relative to the power supply tower (1).

[0023] Furthermore, it includes the following steps:

[0024] S1. Calculate the motor speed V based on the desired position S of the engineering machinery;

[0025] S2, the input data is the distance S from the engineering machinery to the power supply tower, and the difference between the target speed and the current speed. The speed correction value △V is output based on the PI control module.

[0026] S3. Divide the motor speed value and the motor speed difference value into several motor speed ranges and motor speed difference ranges;

[0027] S4. Calibrate and store the position values ​​of the different motor speed difference intervals under the end values ​​of each motor speed interval;

[0028] S5. Determine the corresponding position value based on the current motor speed, the motor speed difference range, and the motor speed difference range;

[0029] S6. Directly read the motor speed at the current moment;

[0030] S7, the speed value V, and the speed correction value △V constitute the motor's speed output value.

[0031] The beneficial effects of this invention compared to the prior art are as follows:

[0032] 1) This invention provides a suspended power transmission device and a method for adjusting the speed of cable retraction and deployment. The location of the power cable supplying the engineering machinery is changed from the traditional ground to the air access. Through a rotatable and height-adjustable power supply tower, the power cable can be freely retracted and deployed synchronously with the engineering machinery, reducing the risk of leakage due to cable wear. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention.

[0034] Figure 2 This is a flowchart illustrating the steps of the method for adjusting the take-up and release speed of the present invention. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] [First Embodiment]

[0039] like Figure 1 The above-ground power transmission device provided in the first embodiment of the present invention includes a power supply tower 1, a receiving tower 2, and a cable 3. The power supply tower 1 is fixed on the ground and has a cable reel 1-111 at its bottom. The receiving tower 2 is located on the top of the engineering machinery. The cable 3 wound on the cable reel 1-111 passes through the top of the power supply tower 1 and is connected to the receiving tower 2 on the top of each engineering machinery.

[0040] In this embodiment, the power supply tower 1 includes a tower body 1-1 fixed to the ground and a cantilever 1-2 located at the top of the tower body 1-1. The middle part of the cantilever 1-2 is hinged to the top of the tower body 1-1 through a pivot 1-3, and a limit device is provided at the hinge position. The cantilever 1-2 can rotate relative to the tower body 1-1 around the position of the pivot 1-3. After the cantilever 1-2 rotates relative to the tower body 1-1 to a preset position, the limit device is used to lock the current rotation position.

[0041] like Figure 1As shown, the tower body 1-1 includes several tower body modules 1-11. Adjacent tower body modules 1-11 are connected by a tower body slewing support device 1-12 to achieve relative rotational movement between adjacent tower body modules 1-11. Therefore, the height of the tower body 1-1 can be adjusted by increasing or decreasing the number of tower body modules 1-11. The cable reel 1-111 is located on one side of the bottom tower body module 1-11 to reel in and unreel the cable 3 wound on it via its own motor.

[0042] like Figure 1 As shown, the cantilever 1-2 includes several cantilever modules 1-21. Adjacent cantilever modules 1-21 are connected by a cantilever rotation support device 1-32 to achieve relative rotational movement between adjacent cantilever modules 1-21. Therefore, the length of the cantilever 1-2 can be adjusted by increasing or decreasing the number of cantilever modules 1-21. One end of the cantilever 1-2 is connected to a cable 3, and the other end of the cantilever 1-2 is equipped with a counterweight 1-21. When the cantilever lengths are different, the counterweight is used to achieve balance at both ends of the cantilever.

[0043] The receiving tower 2 includes a tower body 2-1, the bottom of which is rotatably supported on top of the engineering machinery via a tower body slewing support device 2-2. The tower body 2-1 can rotate 360 ​​degrees relative to the engineering machinery to supply power to the entire machinery. A slip ring 2-3 is installed at the bottom of the tower body 2-1 to improve system performance, simplify the system structure, and prevent the conductors from twisting during rotation.

[0044] In indoor environments or other scenarios where frequent movement is not required or the movement range is limited, this suspended power transmission device adjusts the cable length using a cable reel, allowing the construction machinery to move within a certain range without frequent cable length adjustments.

[0045] [Second Embodiment]

[0046] The improvement of this embodiment compared to the first embodiment is that an angle sensor is installed on the cantilever 1-2 to detect and provide feedback on the angle between the cantilever 1-2 and the tower body 1-1 in real time, and to control the speed of cable winding and unwinding of the cable reel 1-111 according to the size of the angle. When the construction machinery approaches the power supply tower 1, the cantilever rises, and the angle between the cantilever 1-2 and the tower body 1-1 increases; when the construction machinery moves away from the power supply tower 1, the cantilever lowers, and the angle between the cantilever 1-2 and the tower body 1-1 decreases.

[0047] like Figure 2 As shown, this embodiment provides a method for adjusting the take-up and release speed of a suspended power transmission device, including the following steps:

[0048] S1. Calculate the rotational speed V of the motor driving the cable reel based on the desired cantilever angle α;

[0049] S2. The input data are the angle α between the tower body and the cantilever, and the difference between the target speed and the current speed. The speed correction value △V is output based on the PI control module.

[0050] S3. Divide the motor speed value and the motor speed difference value into several motor speed ranges and motor speed difference ranges;

[0051] S4. Calibrate and store the position values ​​of the different motor speed difference intervals under the end values ​​of each motor speed interval;

[0052] S5. Determine the corresponding angle value based on the current motor speed, the motor speed difference range, and the motor speed difference range;

[0053] S6. Directly read the motor speed at the current moment;

[0054] S7, the speed value V, and the speed correction value △V constitute the motor's speed output value.

[0055] [Third Embodiment]

[0056] The improvement of this embodiment compared to the first embodiment is that: a position sensor is installed on the receiving tower 2 to detect and provide feedback on the position of the construction machinery in real time; a motor controller is installed on the cable reel 1-111, and the motor controller adjusts the cable winding and unwinding speed of the cable reel according to the distance of the construction machinery relative to the power supply tower 1.

[0057] like Figure 2 As shown, this embodiment provides a method for adjusting the take-up and release speed of a suspended power transmission device, including the following steps:

[0058] S1. Calculate the motor speed V based on the desired position S of the engineering machinery;

[0059] S2, the input data is the distance S from the engineering machinery to the power supply tower, and the difference between the target speed and the current speed. The speed correction value △V is output based on the PI control module.

[0060] S3. Divide the motor speed value and the motor speed difference value into several motor speed ranges and motor speed difference ranges;

[0061] S4. Calibrate and store the position values ​​of the different motor speed difference intervals under the end values ​​of each motor speed interval;

[0062] S5. Determine the corresponding position value based on the current motor speed, the motor speed difference range, and the motor speed difference range;

[0063] S6. Directly read the motor speed at the current moment;

[0064] S7, the speed value V, and the speed correction value △V constitute the motor's speed output value.

[0065] In this embodiment, the motor controller is connected to the construction machinery. When the construction machinery is more than a first preset distance from the tower, an alarm is issued through the construction machinery. When the construction machinery is more than a second preset distance from the tower, the power is cut off, thereby preventing the cable from being pulled and broken.

[0066] [Fourth Embodiment]

[0067] The difference between the fourth embodiment and the first to third embodiments is that the receiving tower 2, in addition to supplying power to the construction machinery itself, can also be used independently to supply power to working components in the construction machinery, including electric shovels, while the construction machinery still uses its own system to achieve power drive.

[0068] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An airborne power transmission device, characterized by: The suspended power transmission device includes a power supply tower (1), a receiving tower (2), and a cable (3); the power supply tower (1) is fixed on the ground and has a cable reel (1-111) at the bottom; the receiving tower (2) is located on the top of the engineering machinery; the cable (3) wound on the cable reel (1-111) passes through the top of the power supply tower (1) and is connected to the receiving tower (2) on the top of each engineering machinery. The power supply tower (1) includes a tower body (1-1) fixed to the ground and a cantilever (1-2) located at the top of the tower body (1-1). The middle part of the cantilever (1-2) is hinged to the top of the tower body (1-1) through a pivot (1-3), and a limit device is provided at the hinge position. The tower body (1-1) includes several tower body modules (1-11), and adjacent tower body modules (1-11) are connected by a tower body slewing support device (1-12) to realize relative rotational movement between adjacent tower body modules (1-11); The cantilever (1-2) includes several cantilever modules (1-21), and adjacent cantilever modules (1-21) are connected by a cantilever slewing support device (1-32) to realize relative rotational movement between adjacent cantilever modules (1-21); One end of the cantilever (1-2) is connected to a cable (3), and the other end of the cantilever (1-2) is equipped with a counterweight. The receiving tower (2) includes a tower body (2-1), the bottom of which is rotatably supported on the top of the engineering machinery by a tower body rotation support device (2-2); a collector ring (2-3) is provided at the bottom of the tower body (2-1); An angle sensor is installed on the cantilever (1-2) to detect and provide feedback on the angle between the cantilever (1-2) and the tower body (1-1) in real time, and to control the speed of cable winding and unwinding of the cable reel (1-111) according to the size of the angle. The receiving tower (2) is equipped with a position sensor to detect and provide feedback on the position of the engineering machinery in real time; the cable reel (1-111) is equipped with a motor controller, which adjusts the cable winding and unwinding speed of the cable reel according to the distance of the engineering machinery relative to the power supply tower (1).

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