Power electronic pusher

Abstract

The utility model belongs to the technical field of propellers, and particularly relates to a power electronic propeller which comprises a push-out device, a speed reduction device and a motor. The push-out device comprises a cylinder body and a telescopic rod, the upper portion of the telescopic rod telescopically penetrates out of the top of the cylinder body, and the lower portion of the telescopic rod is coaxially and fixedly connected with a guide device. The speed reducer comprises a shell and an output shaft, the shell is coaxially and fixedly connected below the cylinder body, the upper part of the output shaft is in threaded connection with the inner side of the guide device through a thread pair, an input shaft is arranged at the bottom of the shell, and the input shaft and the output shaft are in gear transmission connection; the motor comprises a motor shell, a stator, a rotor and a motor shaft, the motor shaft is coaxially and rotatably arranged in the motor shell, the upper end of the motor shaft is integrally and fixedly connected with the input shaft, an electromagnetic brake is arranged at the lower end of the motor shaft, and a bottom cover is arranged at the bottom of the motor shell. The propeller can realize flexible control of braking torque, and solves the problems of swinging and overspeed phenomena of hoisting transportation equipment due to load impact and energy consumption caused by long-time maintenance of the propeller.

Description

Technical Field

[0001] This utility model belongs to the field of actuator technology, specifically relating to a power electronic actuator. Background Technology

[0002] Brakes are a crucial component of cranes, serving to brake the lifting mechanism. The main types of brakes are drum brakes and disc brakes. Existing brakes often use electro-hydraulic actuators as power components, which cannot achieve timely adjustment of braking torque. When braking, the brake impacts the brake wheel or disc, leading to severe swaying of the lifted load. To address this issue, a frequency converter has been added to the actuator to change the motor speed by altering the drive motor frequency, thus achieving flexible changes in actuator thrust. However, due to the long transmission chain, the limited frequency conversion of the motor results in insignificant changes in actuator thrust, making precise control difficult. Most existing brakes are normally closed. Due to the continuous operation of cranes, the power source must be constantly powered to maintain the brake's released state. Prolonged operation of the actuator causes the motor to heat up, leading to a decrease in power and consequently, a reduction in actuator thrust. Furthermore, this results in high energy consumption and a short service life. Furthermore, the push rods used in brakes must be designed and manufactured according to strict standards for their retraction distance. Long-stroke push rods require custom-made non-standard parts, resulting in long lead times and high prices. The hydraulic cylinders of long-stroke push rods are prone to oil leakage, and their slow action leads to insufficient brake response. Additionally, when the push rod is used in brakes mounted below the plane, the brake typically requires a 180° rotation. In this case, the push rod's retraction relies on gravity, limiting its application and making the brake unsuitable for inverted installation scenarios. Utility Model Content

[0003] In response to the above situation, this utility model designs an electric electronic actuator that can achieve flexible control of the braking torque of the brake.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An electric electronic actuator includes an ejection device, a reduction device, and a motor. The ejection device is an oil-free spiral telescopic cylinder, comprising a cylinder body and a telescopic rod. The upper part of the telescopic rod extends and retracts from the top of the cylinder body, and the lower part of the telescopic rod is coaxially fixed to a guide device. The reduction device is a gear reduction device, comprising a housing and an output shaft. The housing is coaxially fixed to the bottom of the cylinder body, and the upper part of the output shaft is threadedly connected to the inner side of the guide device via a threaded pair. An input shaft is coaxially rotatably mounted at the bottom of the housing, and the input shaft and output shaft are connected by gear transmission. The electric electronic actuator operates in two states: a flexible intelligent operating state and a non-flexible intelligent operating state. In the flexible intelligent operating state, the motor is preferably a servo motor or a stepper motor. The motor includes a motor housing, a stator, a rotor, and a motor shaft. The motor shaft is coaxially rotatably mounted inside the motor housing. The upper end of the motor shaft is integrally fixed to the input shaft, and the lower end of the motor shaft is provided with an electromagnetic brake. The bottom of the motor housing is provided with a bottom cover. In the non-flexible intelligent operating state, the motor can also be a conventional motor.

[0006] Furthermore, the cylinder body, housing, and motor housing are all cylindrical bodies, and are detachably connected from top to bottom by bolts. Each of the three can be disassembled and assembled in pairs to facilitate the inspection and maintenance of the ejection device, reduction device, and motor interior.

[0007] Furthermore, the guide device has a circular structure with a guide groove on the outer edge and a guide post on the inner wall of the cylinder. The guide device is slidably connected to the guide post on the inner wall of the cylinder through the guide groove to prevent the guide device from rotating inside the cylinder. The inner circle of the guide device is provided with an internal thread, and the outer side of the output shaft is provided with an external thread. As the output shaft rotates, it drives the guide device to slide up and down along the inner wall of the cylinder, thereby driving the telescopic rod to extend or retract.

[0008] Furthermore, a stroke adjustment screw for adjusting the extension and retraction stroke of the guide device is provided on the top left side of the cylinder body, and a distance sensor for detecting the extension and retraction distance of the guide device is provided on the top right side of the cylinder body.

[0009] Furthermore, the telescopic rod is coaxially provided with a telescopic cavity in the middle, the upper end of the output shaft extends into the telescopic cavity, and the lower end of the output shaft extends into the housing. The travel of the telescopic rod is mainly limited by the length of the travel adjusting screw and the threaded pair of the output shaft.

[0010] Furthermore, the lower part of the output shaft is rotatably connected to the top of the housing, and a transmission shaft is provided inside the housing. Both the upper and lower ends of the transmission shaft are rotatably connected to the housing. A transmission tooth surface is fixed on the upper part of the transmission shaft, and a transmission gear is fixed on the lower part of the transmission shaft. An output gear that meshes with the transmission tooth surface is fixed on the lower end of the output shaft, and an input tooth surface that meshes with the transmission gear is provided on the input shaft.

[0011] Furthermore, the stator is fixedly installed inside the motor housing, the rotor is coaxially fixed on the motor shaft, the lower end of the motor shaft extends out from the lower part of the motor housing, and the electromagnetic brake is coaxially fixedly sleeved on the lower end of the motor shaft. The electromagnetic brake is used for rapid braking and brake maintenance of the motor shaft.

[0012] Furthermore, the upper and lower ends of the transmission shaft are rotatably connected to the housing via bearing one; the upper and lower ends of the motor shaft are rotatably connected to the motor housing via bearing two.

[0013] This utility model also includes other components that enable its normal use, all of which are conventional means in the field. In addition, devices or components not limited in this utility model, such as brake springs, distance sensors, electromagnetic brakes, etc., all adopt existing technologies in the field.

[0014] The beneficial effects of this utility model are as follows:

[0015] This electric electronic actuator is driven by a motor, with a force-amplifying mechanism for transmission, and operates in an oil-free spiral lifting manner. It fundamentally solves the problems of oil leakage, seepage, and slow response speed of existing brakes that use electro-hydraulic push rods, which are difficult to start due to the viscosity of the hydraulic oil at low temperatures.

[0016] This power electronic actuator can automatically control the speed and stroke of the push rod as it rises and falls, enabling intelligent operation in conjunction with supporting equipment.

[0017] This electric electronic actuator is applied to the crane brake. It can automatically adjust the braking torque of the brake according to the actual weight being lifted, so as to achieve flexible braking and solve the swaying phenomenon of the crane when lifting heavy objects.

[0018] This power electronic actuator is applied to belt conveyor braking. It can achieve flexible control of the braking torque of the brake according to the actual load conditions of the belt conveyor, thus solving the problem of overspeeding of the belt conveyor. It can also solve the problem of energy saving and consumption reduction of complete sets of brake equipment for belt conveyors, windbreak wedges, bridge erecting machines and other actuators that require long-term energy consumption.

[0019] The rated stroke of this power electronic actuator can be increased or decreased as needed, thus solving the problem of brakes being limited by retraction distance.

[0020] This power electronic actuator avoids the installation angle limitations of existing Ed actuators due to air chamber issues. Its installation application range is expanded to any angle from 0-360° for tilted or inverted installation.

[0021] This power electronic actuator is small in size, light in weight, and low in noise. It can be driven by high power for a short time and maintained by low power for a long time, resulting in significant energy saving and meeting the environmental protection requirements of energy conservation and emission reduction. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the power electronic actuator in the embodiment. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0024] It should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer" indicate directions or positional relationships based on the attached drawings and are used only for ease of description.

[0025] Example

[0026] like Figure 1 As shown, the power electronic actuator includes an ejection device, a reduction device, and a motor. The ejection device is an oil-free spiral telescopic cylinder, comprising a cylinder body 11 and a telescopic rod 12. The upper part of the telescopic rod extends and retracts from the top of the cylinder body, and the lower part of the telescopic rod is coaxially fixed to an annular guide device 7. A stroke adjustment screw 9 for adjusting the extension and retraction stroke of the guide device is provided on the left side of the top of the cylinder body, and a distance sensor 8 for detecting the extension and retraction distance of the guide device is provided on the right side of the top of the cylinder body. The reduction device is a gear reduction device, comprising a housing 13 and an output shaft 6. The housing is coaxially fixed to the bottom of the cylinder body, and the upper part of the output shaft is threadedly connected to the inner side of the guide device through a threaded pair. An input shaft is coaxially rotatably provided at the bottom of the housing, and the input shaft and the output shaft are connected by gear transmission. The motor is a servo motor, comprising a motor housing 4, a stator 2, a rotor 3, and a motor shaft 14. The motor shaft is coaxially rotatably provided inside the motor housing, and the upper end of the motor shaft is integrally fixed to the input shaft. An electromagnetic brake 1 is provided at the lower end of the motor shaft, and a bottom cover 10 is provided at the bottom of the motor housing.

[0027] The cylinder body, housing, and motor housing are all cylindrical tubes, and are detachably connected from top to bottom by bolts 17.

[0028] The guide device has a circular ring structure. A guide groove is provided on the outer edge of the guide device, and a guide post is provided on the inner wall of the cylinder. The guide device is slidably connected to the guide post on the inner wall of the cylinder through the guide groove to prevent the guide device from rotating inside the cylinder. The inner circle of the guide device is provided with an internal thread, and the outer side of the output shaft is provided with an external thread that is threaded to the internal thread.

[0029] The telescopic rod has a telescopic cavity 18 coaxially arranged in the middle. The upper end of the output shaft extends into the telescopic cavity, and the lower end of the output shaft extends into the housing. The travel of the telescopic rod is mainly limited by the length of the threaded pair of the travel adjusting screw and the output shaft. The axial depth of the telescopic cavity should be greater than the telescopic travel of the telescopic rod, and the length of the distance sensor extending out of the cylinder should be less than the length of the travel adjusting screw extending into the cylinder to prevent the detection head of the distance sensor from being crushed.

[0030] The lower part of the output shaft is rotatably connected to the top of the housing. A transmission shaft 5 is provided inside the housing. Both the upper and lower ends of the transmission shaft are rotatably connected to the housing. A transmission tooth surface is fixed on the upper part of the transmission shaft, and a transmission gear is fixed on the lower part of the transmission shaft. An output gear that meshes with the transmission tooth surface is fixed on the lower end of the output shaft. An input tooth surface that meshes with the transmission gear is provided on the input shaft.

[0031] The stator is fixedly installed inside the motor housing, the rotor is coaxially fixed on the motor shaft, the lower end of the motor shaft passes through the lower part of the motor housing, and the electromagnetic brake is coaxially fixedly sleeved on the lower end of the motor shaft.

[0032] The upper and lower ends of the drive shaft are rotatably connected to the housing via bearing 15; the upper and lower ends of the motor shaft are rotatably connected to the motor housing via bearing 16.

[0033] When this power electronic actuator is applied to crane brakes, it can achieve flexible control of the brake torque, using a reasonable torque to control the braking process of the brake wheel (disc), and realize uniform deceleration and flexible braking during the brake holding process; it solves the technical problem that the existing brake torque cannot be adjusted in time with changes in the lifting weight, thereby reducing the swaying of the lifted goods and dynamic load impact caused by excessive braking torque.

[0034] The technical solution of this utility model is not limited to the specific embodiments described above. Without departing from the scope and spirit of the described embodiments, many modifications and changes will be obvious to those skilled in the art. Any technical modifications made within the spirit and principles of this utility model shall fall within the protection scope of this utility model.

Claims

1. A power electronic actuator, characterized in that: The device includes an ejection device, a reduction gear, and a motor. The ejection device includes a cylinder and a telescopic rod, the upper part of which extends and retracts from the top of the cylinder, and a guide device is coaxially fixed to the lower part of the telescopic rod. The reduction gear includes a housing and an output shaft, the housing being coaxially fixed to the bottom of the cylinder, the upper part of the output shaft being threadedly connected to the inner side of the guide device via a threaded pair, and an input shaft being provided at the bottom of the housing, with a gear transmission connection between the input shaft and the output shaft. The motor includes a motor housing, a stator, a rotor, and a motor shaft, the motor shaft being coaxially rotatably mounted inside the motor housing, the upper end of the motor shaft being integrally fixed to the input shaft, an electromagnetic brake being provided at the lower end of the motor shaft, and a bottom cover being provided at the bottom of the motor housing.

2. The power electronic actuator according to claim 1, characterized in that: The cylinder body, housing, and motor housing are all cylindrical bodies, and are detachably connected from top to bottom by bolts.

3. The power electronic actuator according to claim 1, characterized in that: The guide device has a circular structure. A guide groove is provided on the outer edge of the guide device, and a guide post is provided on the inner wall of the cylinder. The guide device is slidably connected to the guide post on the inner wall of the cylinder through the guide groove. The inner circle of the guide device is provided with an internal thread.

4. The power electronic actuator according to claim 1, characterized in that: A stroke adjustment screw is provided on the top left side of the cylinder body for adjusting the extension and retraction stroke of the guide device.

5. The power electronic actuator according to claim 1, characterized in that: A distance sensor for detecting the extension and retraction distance of the guide device is installed on the top right side of the cylinder.

6. The power electronic actuator according to claim 1, characterized in that: The telescopic rod has a telescopic cavity coaxially arranged in the middle, the upper end of the output shaft extends into the telescopic cavity, and the lower end of the output shaft extends into the housing of the reduction device.

7. The power electronic actuator according to claim 1, characterized in that: The lower part of the output shaft is rotatably connected to the top of the housing. A transmission shaft is provided inside the housing. Both the upper and lower ends of the transmission shaft are rotatably connected to the housing. A transmission tooth surface is fixed on the upper part of the transmission shaft, and a transmission gear is fixed on the lower part of the transmission shaft. An output gear that meshes with the transmission tooth surface is fixed on the lower end of the output shaft. An input tooth surface that meshes with the transmission gear is provided on the input shaft.

8. The power electronic actuator according to claim 1, characterized in that: The stator is fixedly installed inside the motor housing, the rotor is coaxially fixed on the motor shaft, the lower end of the motor shaft passes through the lower part of the motor housing, and the electromagnetic brake is coaxially fixedly sleeved on the lower end of the motor shaft.

9. The power electronic actuator according to claim 7, characterized in that: The upper and lower ends of the drive shaft are rotatably connected to the housing via bearing one; the upper and lower ends of the motor shaft are rotatably connected to the motor housing via bearing two.

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