Rotary speed reduction braking device for rotary table and control method of rotary speed reduction braking device

Abstract

The invention discloses a rotary table rotation speed reduction braking device and a control method thereof, and the device comprises at least two groups of detection units which are fixed below a rotary table; the sensing block is fixed on the frame and is positioned below the track of the detection unit rotating along with the rotary table; the mechanical limiting module is mounted on the rotary table and the frame and is used for limiting a rotary terminal of the rotary table; and the program control module is respectively connected with the rotary table rotation driver, the detection unit and the induction block. The invention solves the problems of low operation safety, poor operation smoothness, large impact load and the like caused by rigid limiting impact at the extreme position of the rotary table.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mobile lifting work platforms, and particularly relates to a rotary deceleration braking device for a rotary table and a control method thereof. BACKGROUND

[0002] A mobile lifting work platform is an economical and efficient aerial work equipment. Its advantages are that a larger working range can be covered by adjusting the arm frame amplitude, telescopic length and rotary angle of the rotary table, and that the operation is flexible and the mobile lifting work platform can be quickly moved to a working point without the need to re-arrange the working equipment to continuously complete spatial work. The mobile lifting work platform effectively solves the safety hazards and efficiency problems of traditional aerial work (scaffolding, ladders and baskets), and covers the demand for aerial work in multiple scenarios indoors and outdoors.

[0003] For the selection of a mobile lifting work platform, a 360° rotary platform is preferred, and the rotary table of the whole machine can continuously rotate to cover the surrounding annular area. However, due to cost considerations and structural limitations of small and medium-sized mobile lifting work platforms, or because of space limitations of the construction site, some mobile lifting work platforms often have a non-360° rotary structure to avoid the twisting of the downline bundle and to limit the rotary angle to avoid obstacles. The conventional non-360° rotary structure is achieved by installing a limit angle limiter in the rotary range of the rotary table. When the rotary table reaches the angle limiter, the rotary table is forced to stop to achieve the purpose. The existing limiting structure is commonly a mechanical rigid limiter, that is, a limiting block is fixed below the rotary table, and a stopper is arranged on the frame. When the rotary table of the mobile lifting work platform rotates to the limit position, the rotary angle is limited by the hard contact between the limiting block and the stopper. However, a large impact load is generated at the moment of collision, and the safety experience of the aerial personnel is poor. Another method is to install a limiting block made of flexible materials such as rubber or polyurethane. However, due to the high impact speed, the flexible material has a certain buffering effect, but the experience is still poor. If the thickness of the buffer pad is increased, the rotary angle will be sacrificed.

[0004] It is evident that existing non-360° rotating mobile lifting work platforms typically employ mechanical hard impact as their turntable limit device. While the structure is simple, it suffers from significant drawbacks when the turntable rotates to the limit angle position: First, low operational safety: especially under conditions of large boom operation, the platform rotation speed can reach 0.7 m / s. The impact will cause the work platform to shake violently and easily become unbalanced, leading to tools and materials falling, resulting in a poor user experience and high safety risks. Second, poor operational smoothness: with existing non-360° rotating mobile lifting work platforms, operators must constantly monitor the rotation angle when approaching the limit device to avoid triggering the rigid limit. Frequent deceleration and stops during operation can easily lead to false triggering, further amplifying safety hazards. Third, high impact load: the impact load generated by the collision is often several times the load of the rotation device. Long-term use can easily lead to wear on the slewing bearing teeth, fatigue cracking of the boom root weld, and overload damage to the slewing drive motor or hydraulic motor, significantly shortening the equipment's service life. Furthermore, the impact load generated by the collision may even cause the rigid limit block to fail after impact. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a turntable rotation deceleration braking device and its control method. To solve the above-mentioned technical problems, the present invention is implemented using the following solution: This invention provides a turntable rotation deceleration and braking device, comprising: The detection unit is set up in no fewer than two groups and fixed under the turntable; The sensing block is fixed on the frame and located below the detection unit as it rotates with the turntable. Mechanical limit module, installed on the turntable and frame, is used for limiting the rotation end of the turntable; The program control module is connected to the turntable rotary driver, the detection unit, and the sensing block, respectively.

[0006] Furthermore, the detection unit includes a detection switch and a mounting bracket, with the detection switch fixedly mounted on the mounting bracket and the mounting bracket fixedly mounted under the turntable.

[0007] Furthermore, the detection unit also includes a base, which is fixedly mounted on a mounting bracket, and the detection switch is fixedly mounted on the base.

[0008] Furthermore, an adjustable elongation hole is provided on the mounting bracket, and the base is fixedly installed on the mounting bracket through the adjustable elongation hole.

[0009] Furthermore, the length of the sensing block corresponds to the deceleration range of the turntable rotation.

[0010] Furthermore, the deceleration range of the turntable rotation is triggered by the detection unit rotating through the sensing block.

[0011] Furthermore, the mechanical limit module includes a limit block and a stop block. The limit block is fixedly installed under the turntable, and the stop block is fixedly installed on the vehicle frame.

[0012] The present invention also provides a control method for the aforementioned turntable rotation deceleration and braking device, comprising: When a detection unit does not rotate past the sensing block to trigger the turntable, the program control module controls the turntable rotation driver to maintain the turntable's normal rotation speed. When any detection unit rotates past the sensing block to trigger the turntable, a trigger signal is sent to the program control module, which then controls the turntable rotation driver to decelerate the turntable. When all detection units rotate past the sensing block to trigger the turntable, a trigger signal is sent to the program control module, which then controls the turntable rotation driver to brake the turntable and uses a mechanical limit module to limit the turntable's end position. Beneficial effects

[0013] This invention employs a combination of multiple detection units, sensing blocks, mechanical limit modules, and program control modules. It first performs deceleration control and then braking, reducing the inertial impact caused by the excessive rotation speed of the turntable directly hitting the mechanical limit. This effectively reduces the platform's violent shaking, alleviates wear on the slewing bearing teeth, and improves fatigue resistance at the boom root weld.

[0014] This invention employs multiple detection units, one of which triggers a deceleration action and the other triggers a braking action. This reduces the inertial impact caused by the high rotation speed of the turntable directly impacting the mechanical limit. At this time, due to the inertial buffer, the mechanical limit only makes slight contact, thus effectively reducing the impact caused by the rigid limit impact and providing secondary protection for the limit.

[0015] In the early stage of mechanical limiting, the present invention adds a rotary deceleration control device, and achieves dual protection of deceleration braking and mechanical limiting through the coordinated design of "pre-deceleration braking + mechanical final limiting".

[0016] The mounting bracket of the detection unit of this invention has an adjustable elongated hole, which allows for adjustment of the left and right positions of the detection switch on the base on the mounting bracket, and also facilitates adjustment of the distance of the braking and mechanical limit of the sensing range.

[0017] This invention enables the turntable to share a single detection device for both forward and reverse rotation, thus saving manufacturing costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a turntable rotation deceleration and braking device provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the detection unit in a turntable rotation deceleration braking device provided in Embodiment 1 of the present invention; Figure 3This is a schematic diagram of the first working state of a turntable rotation deceleration and braking device provided in Embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the second working state of a turntable rotation deceleration and braking device provided in Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the third working state of a turntable rotation deceleration and braking device provided in Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the fourth working state of a turntable rotation deceleration and braking device provided in Embodiment 2 of the present invention; In the diagram: 1. Chassis; 2. Rotary drive; 3. Turntable; 4. Mechanical limit module; 5. First detection unit; 6. Second detection unit; 7. Sensor block; 8. Program control module; 41. Limit block; 42. Stop block; 5. First detection unit; 51. Detection switch; 52. Base; 53. Mounting bracket; 531. Adjustable elongation hole. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1

[0020] like Figure 1 and Figure 2 As shown, this embodiment provides a turntable rotation deceleration and braking device, which consists of a detection unit, a sensing block 7, a mechanical limit module 4, and a program control module 8. The detection unit has at least two sets, fixed under the turntable 3. The sensing block 7 is fixed on the frame 1 and located below the rotation trajectory of the detection unit along the turntable 3. The mechanical limit module 4 is installed on the turntable 3 and the frame 1 for limiting the rotation end of the turntable 3. The program control module 8 is connected to the turntable rotation driver, the detection unit, and the sensing block 7. The detection unit includes a detection switch 51 and a mounting bracket 53. The detection switch 51 is fixedly installed on the mounting bracket 53, which is fixedly installed under the turntable 3. Further, the detection unit also includes a base 52, which is fixedly installed on the mounting bracket 53, and the detection switch 51 is fixedly installed on the base 52. Further, an adjustable elongation hole 531 is provided on the mounting bracket 53, and the base 52 is fixedly installed on the mounting bracket 53 through the adjustable elongation hole 531. The length of the sensing block 7 corresponds to the deceleration range of the turntable 3. The deceleration range of the turntable 3 is triggered by the detection unit rotating through the sensing block 7. The mechanical limit module 4 includes a limit block 41 and a stop block 42. The limit block 41 is fixedly installed under the turntable 3, and the stop block 42 is fixedly installed on the frame 1.

[0021] Specifically, the first detection unit 5 and the second detection unit 6 are fixed to the lower surface of the turntable 3 by bolts, and perform circular motion within the same radius as the turntable 1 rotates. The first detection unit 5 includes a detection switch 51 mounted on the base 52. The detection switch 51 can be a proximity switch, limit switch, or other detection sensor to transmit signals. The base 52 is fixed to the mounting bracket 53 by bolts. The mounting bracket 53 includes an adjustable elongated hole 531, which allows for adjustment of the left and right position of the base 52 on the mounting bracket 53, and also facilitates adjustment of the braking and mechanical limit distance of the sensing range. The second detection unit 6 has the same structure as the first detection unit 5. The sensing block 7 is fixed to the frame 1. The sensing block is located directly below the circular trajectory swept by the first detection unit 5 and the second detection unit 6. The length of the sensing block 7 is the deceleration range provided for the turntable rotation. The program control module 8 is fixed on the turntable. The output signal of the program control module 8 can drive the rotary drive 2 to rotate the turntable 3 in any direction. When the turntable 6 rotates to the deceleration range of the sensing block 7, either the first detection unit 5 or the second detection unit 6 touches the sensing block 7. The first detection switch 5 or the second detection switch 6 provides an input signal to the program control module 8, and the program control module 8 implements the deceleration action of the rotary drive 2. When both the first detection unit 5 and the second detection unit 6 touch the sensing block, and when the first detection unit 5 and the second detection unit 6 transmit the received signal to the program control module 8, the rotary drive 2 is braked, causing the rotary movement of the turntable 3 to stop. The mechanical limit module 4 includes a limit block 41 fixedly installed below the turntable and a stop block 42 fixed on the frame 1. When the turntable 3 rotates clockwise or counterclockwise to reach the limit angle, it can provide mechanical end limit for the rotation of the turntable 3. Example 2

[0022] This embodiment provides a control method for the turntable rotation deceleration and braking device described in Embodiment 1. To more clearly express the specific logic control method, the definitions of clockwise and counterclockwise rotation directions and the detection unit are only used as a description of the logic control process. The specific control method is as follows: (1) The turntable 3 is rotated clockwise by manipulating the handle. When the second detection unit 6 is in the triggered state, the input signal is transmitted to the program control module 8 to implement the rotation deceleration mode of the turntable 3. At this time, the turntable 3 rotates at the decelerated speed, and the second detection unit 6 remains in the triggered state (e.g., Figure 3 (As shown).

[0023] (2) The turntable decelerates in the deceleration range. When both the first detection unit 5 and the second detection unit 6 are triggered, the input signal is transmitted to the program control module 8 to implement the turntable 3 rotation braking (e.g. Figure 4 As shown), after braking, when the turntable 3 rotates clockwise to the limit angle, the mechanical limit module 4 can provide mechanical terminal limit for the rotation of the turntable 3.

[0024] (3) Release the handle, the program control module 8 clears the turntable 3 rotation braking state, and reverse the handle to rotate the turntable 3 counterclockwise. At this time, either the first detection unit 5 or the second detection unit 6 is in the trigger state, and the input signal is transmitted to the program control module 8 to implement the turntable 3 rotation within the deceleration range of the sensing block 7 and maintain the deceleration mode.

[0025] (4) When the first detection unit 5 or the second detection unit 6 is in an untriggered state, the turntable 3 rotates back to its normal rotation speed.

[0026] (5) Turntable 3 continues to rotate counterclockwise. When the first detection unit 5 is in the triggered state, the input signal is transmitted to the program control module 8 to implement the turntable 3 rotation deceleration mode. At this time, the turntable 3 rotates at the decelerated speed, and the first detection unit 5 remains in the triggered state (e.g., Figure 5 (As shown).

[0027] (6) When the turntable 3 decelerates in the deceleration range, and both the second detection unit 6 and the first detection unit 5 are in the triggered state, the input signal is transmitted to the program control module 8 to implement the turntable 3 rotation braking (e.g. Figure 6 As shown), after braking, when the turntable 3 rotates counterclockwise to the limit angle, the mechanical limit module 4 can provide mechanical terminal limit for the rotation of the turntable 3.

[0028] (7) Release the handle, and the program control module 8 clears the turntable 3 rotation braking state. The forward operation handle will then rotate the turntable clockwise. At this time, either the first detection unit 5 or the second detection unit 6 is in the triggered state, and the input signal is transmitted to the program control module 8 to implement the turntable 3 rotation and maintain the deceleration mode within the deceleration range of the sensing block 7.

[0029] (8) When both the first detection unit 5 and the second detection unit 6 are in an untriggered state, the turntable 3 will rotate back to its normal clockwise rotation speed.

[0030] In summary, this invention employs a combination of multiple detection units, sensing blocks, mechanical limit modules, and program control modules. It first performs deceleration control and then braking, reducing the inertial impact caused by the turntable's excessive rotational speed directly impacting the mechanical limit. This effectively reduces severe platform shaking, lessens wear on the slewing bearing teeth, and improves fatigue resistance at the boom root weld. The use of multiple detection units, one triggering deceleration and the other braking, simultaneously reduces the inertial impact caused by the turntable's high rotational speed directly impacting the mechanical limit. Due to inertial buffering, the mechanical limit only makes slight contact, effectively reducing the impact of rigid limit impacts and providing secondary protection for the limit. In the early stage of mechanical limit operation, a rotational deceleration control device is added. Through the coordinated design of "pre-deceleration braking + mechanical final limit," dual protection of deceleration braking and mechanical limit is achieved. Furthermore, a single detection device is used for both forward and reverse rotation of the turntable, saving manufacturing costs.

[0031] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A turntable rotation deceleration and braking device, characterized in that, include: The detection unit is set up in no fewer than two groups and fixed under the turntable; The sensing block is fixed on the frame and located below the detection unit as it rotates with the turntable. Mechanical limit module, installed on the turntable and frame, is used for limiting the rotation end of the turntable; The program control module is connected to the turntable rotary driver, the detection unit, and the sensing block, respectively.

2. The turntable rotation deceleration and braking device according to claim 1, characterized in that, The detection unit includes a detection switch and a mounting bracket. The detection switch is fixedly mounted on the mounting bracket, which is fixedly mounted under the turntable.

3. The turntable rotation deceleration and braking device according to claim 2, characterized in that, The detection unit also includes a base, which is fixedly mounted on a mounting bracket, and the detection switch is fixedly mounted on the base.

4. The turntable rotation deceleration and braking device according to claim 3, characterized in that, The mounting bracket has adjustable holes, and the base is fixedly installed on the mounting bracket through the adjustable holes.

5. The turntable rotation deceleration and braking device according to claim 1, characterized in that, The length of the sensing block corresponds to the deceleration range of the turntable rotation.

6. The turntable rotation deceleration and braking device according to claim 5, characterized in that, The deceleration zone of the turntable rotation is triggered by the detection unit rotating through the sensing block.

7. The turntable rotation deceleration and braking device according to claim 1, characterized in that, The mechanical limit module includes a limit block and a stop block. The limit block is fixedly installed under the turntable, and the stop block is fixedly installed on the vehicle frame.

8. A control method for the turntable rotation deceleration and braking device according to any one of claims 1 to 7, characterized in that, include: When a detection unit does not rotate past the sensing block to trigger the turntable, the program control module controls the turntable rotation driver to maintain the turntable's normal rotation speed. When any detection unit rotates past the sensing block to trigger the turntable, a trigger signal is sent to the program control module, which then controls the turntable rotation driver to decelerate the turntable. When all detection units rotate past the sensing block to trigger the turntable, a trigger signal is sent to the program control module, which then controls the turntable rotation driver to brake the turntable and uses a mechanical limit module to limit the turntable's end position.

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