Scissor fork type movable working platform in pulley combination driving mode

Abstract

The invention discloses a shear fork type movable working platform in a pulley combined driving mode. The device is jointly composed of a lifting platform, a scissor fork type supporting frame, a control system, a driving system, a walking mechanism, a steering mechanism and the like. The mode that the pulley blocks are matched with the steel wire rope traction supporting frame to achieve lifting of the working platform replaces a traditional mode that the working platform is lifted through hydraulic driving, and the driving mode is that a battery supplies power to a motor to drive a self-contained winding drum traction steel wire rope; and the lifting of the working platform is realized while the stress is greatly reduced. A fixed pulley and movable pulley combined mode is adopted, so that the lifting force is increased by 8 times; the hydraulic drive is converted into hydraulic energy from electric energy of a battery and then converted into lifting mechanical energy from the hydraulic energy, and the energy consumption is about 40%; electric drive converts electric energy of a battery into mechanical energy for lifting, energy consumption does not exceed 15%, and actual power consumption is greatly reduced. The device also has the characteristics of no pollution, simple structure, low cost and strong environmental adaptability.

Description

Technical Field

[0001] This invention relates to a scissor lift mobile work platform with a pulley combination drive mode; specifically, it relates to a lifting mechanism with a pulley combination drive mode and a scissor lift mobile work platform containing this mechanism. Background Technology

[0002] With increasingly stringent requirements for energy-saving and environmentally friendly products from the external environment, and with intensifying competition and the need to ensure product performance stability, traditional hydraulically driven scissor lift platforms suffer from the need for regular hydraulic oil replacement, the risk of oil leakage, unstable hydraulic drive performance under large temperature differences, and low work efficiency.

[0003] The existing scissor lift aerial work platform uses a battery pack as its power source. The power source drives the motor pump, which drives the hydraulic cylinder to extend and retract through the reversing valve group, thereby realizing the lifting and lowering of the platform and the steering of the wheels. When hydraulic oil enters the luffing cylinder, it pushes the piston to move, causing the rods of the scissor lift support frame to extend, and the lifting platform rises accordingly. Conversely, when the hydraulic oil flows back, the piston moves in the opposite direction, the scissor lift support frame retracts, and the lifting platform descends. When hydraulic oil enters the wheel steering cylinder, the cylinder pushes the steering linkage mechanism to realize the steering of the wheels. Its disadvantages are: (1) The hydraulic structure and principle are complex. After the scissor lift arm design is completed, the configuration (i.e., arrangement) of the lifting cylinder needs to be studied, the force analysis of the cylinder needs to be performed, and then the cylinder needs to be designed. After the cylinder design is completed, it is also necessary to check whether the lifting cylinder and the scissor mechanism interfere with each other during the entire lifting process. If the arrangement of the lifting cylinder does not interfere with each other, the designers still need to conduct repeated tests to ensure the reliability of the product. If the lifting cylinder and the scissor mechanism interfere with each other or the arrangement method cannot meet the design requirements, the lifting cylinder arrangement method needs to be redesigned, and a new test prototype needs to be made until the new design scheme can achieve the product function. The pump-valve-cylinder driven scissor arm scheme requires many hydraulic components and hydraulic hoses and hard pipes; it can be seen that the traditional design method not only requires a lot of manpower, but also has a high cost and a long design cycle; (2) Due to the complex structure and principle of the hydraulic system, the requirements for after-sales skills are high, and the difficulty of after-sales service is relatively large, thus increasing the enterprise cost significantly; (3) Due to the large number of hydraulic system connectors and the fact that the hoses are exposed in the boom, they are easily worn during operation, which often leads to component damage and hydraulic oil leakage, causing environmental pollution; (4) The energy conversion principle of this system is: electrical energy is converted into hydraulic energy and then into mechanical energy; the pump-valve-cylinder driven scissor arm scheme requires many hydraulic components and hydraulic hoses and hard pipes, and the hydraulic pressure is greatly lost after multiple stages of transmission; the above two factors determine that the hydraulic transmission power consumption is large, ultimately resulting in large battery energy consumption; (5) In the cold and low temperature working conditions, the hydraulic oil flow is greatly affected by temperature, and the hydraulic drive has the disadvantages of unstable operation and low working efficiency. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a scissor lift mobile work platform that uses a pulley combination drive mode to achieve the lifting of the work platform by means of a pulley block and a steel wire rope traction support frame, replacing the traditional hydraulic drive lifting work platform working mode.

[0005] The technical solution of the present invention is as follows: A scissor-type mobile work platform with pulley combination drive mode, comprising a lifting platform, a scissor-type support frame and a frame platform, wherein a second track is installed at the bottom end of the lifting platform, and a first track is welded to the upper end of the frame platform; one end of the scissor-type support frame is fixed, and the other end slides in the first and second tracks respectively through the installed rolling wheel axle mechanism. The chassis platform is also equipped with a control system and a drive system.

[0006] Furthermore, the control system adopts CAN bus control technology, with a controller installed on the chassis platform and an operating handle installed on the lifting platform. The chassis platform and the lifting platform communicate via CAN bus.

[0007] Furthermore, the drive system includes a planetary reducer integrated linear motor, a drum, a four-wheel fixed pulley block, a four-wheel movable pulley block, a three-wheel fixed pulley block, a rope clamp, and a wire rope; The planetary reducer is integrated with a linear motor and a control system controller. The drum and the planetary reducer are integrated with a linear motor connected by inner and outer flanges. The two ends of the four-wheel fixed pulley assembly are bolted to the bottom of the vehicle frame platform; The four-wheel movable pulley assembly is mounted on the middle of the shaft of the rolling wheel shaft mechanism via rolling bearings; The three-wheeled fixed pulley system is installed below the vehicle frame platform; The wire rope is fixed at both ends. One end is fixed to the drum by a clamp, and the other end is fixed to the rope clamp after repeatedly winding around a four-wheel fixed pulley group, a four-wheel movable pulley group, and a three-wheel fixed pulley group.

[0008] Furthermore, the four-wheel pulley assembly is installed on the upper part of the chassis platform, while the remaining components are installed on the lower part of the chassis platform.

[0009] Furthermore, the drum adopts a single-layer inclined groove type.

[0010] Furthermore, the drive system uses a battery as its power source.

[0011] Furthermore, two walking mechanisms are installed on the front and rear sides of the lower end of the vehicle frame platform, and a steering mechanism is connected between the two walking mechanisms. The steering mechanism is installed in one set, that is, two wheels are fixed and two wheels can be steered.

[0012] Furthermore, the walking mechanism includes four wheels connected to the chassis platform, and a walking motor is installed on each of the wheels.

[0013] Furthermore, the steering mechanism includes a linkage assembly mounted on both sides of the wheels and an electric telescopic rod connected at one end to the linkage assembly and at the other end to the vehicle frame platform.

[0014] Furthermore, the scissor-type support frame has at least four sets.

[0015] Beneficial Effects: Compared with existing technologies, this invention has the following significant advantages: 1. Low Energy Consumption: This invention uses a combination of fixed pulleys and movable pulleys, thereby increasing the lifting force by 8 times. Hydraulic drive: Converting battery electrical energy into hydraulic energy, and then from hydraulic energy into lifting mechanical energy, consumes approximately 40% of the energy. Electric drive: Converting battery electrical energy into lifting mechanical energy consumes no more than 15% of the energy. This significantly reduces actual power consumption; 2. No Pollution: Traditional electro-hydraulic drives suffer from oil leaks and waste oil generated during oil changes, resulting in pollution. This invention uses an electric + pulley combination, eliminating the risk of pollution; 3. Simple Structure and Easy Maintenance; 4. Low Cost: This invention eliminates the hydraulic system, significantly reducing costs in design, procurement, after-sales service, and other aspects; 5. Strong Environmental Adaptability: Unaffected by temperature differences, thus improving stability and working efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall system architecture of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a two-dimensional (top-down view) layout diagram of the drive system in this invention; Figure 4 This is a three-dimensional structural diagram of the driving system in this invention; Figure 5 This is a schematic diagram of the walking mechanism and steering mechanism in this invention; Among them, 1 is the lifting platform, 2 is the scissor fork support frame, 3 is the control system, 4 is the drive system, 5 is the walking mechanism, 6 is the steering mechanism, 7 is the rolling wheel axle mechanism, 8 is track one, 9 is track two, 10 is the frame platform, 11 is the planetary reducer integrated linear motor, 12 is the drum, 13 is the four-wheel fixed pulley block, 14 is the four-wheel movable pulley block, 15 is the three-wheel fixed pulley block, 16 is the rope clamp, and 17 is the wire rope. Detailed Implementation

[0017] The specific technical solution of the present invention will be further described in detail below with reference to specific examples.

[0018] As shown in the figure, the scissor-type mobile work platform with pulley combination drive mode of the present invention includes a lifting platform 1, a scissor-type support frame 2, a control system 3, a drive system 4, a walking mechanism 5, and a steering mechanism 6, etc. Among them, lifting platform 1 is installed at the top, which provides a stable working platform for operators and tools; Scissor fork support frame 2: Installed below the lifting platform 1, there are a total of 4 sets of scissor fork support frames 2 in the whole vehicle; Chassis platform 10: Installed below the scissor fork support frame 2; A second track 9 is installed below the lifting platform 1, and a first track 8 is installed above the frame platform 10 (the first track 8 is located on the upper part of the frame platform 10, and the two parts are fixed by welding); one end of the scissor fork support frame 2 is fixed, and the other end is equipped with a rolling wheel axle mechanism 7 that slides in the first track 8 and the second track 9 respectively, and achieves up and down lifting under the joint action of the drive system 4; Control system 3: Installed on the upper part of the chassis platform 10; (1) The control system 3 adopts CAN bus control technology. A controller is installed on the chassis platform 10, and an operating handle is installed on the lifting platform 1. The chassis platform 10 and the lifting platform 1 communicate via CAN bus to realize the control of the machine's actions. (2) The whole machine adopts stepless speed regulation, which can realize the precise and stable operation of various machine actions; (3) The entire machine is directly driven by the walking motor 19; (4) The control system 3 controls all the actions of the whole machine, including the left and right turning of the vehicle, forward and backward driving, high and low speed switching, and the lifting and lowering of the work platform 10. (5) Multiple safety protection and warning measures, including tilt protection, handle integrated interlock protection, automatic pit protection, high-altitude automatic low-speed protection, three-second pause during descent, load alarm system, charging system, emergency stop button, action buzzer, strobe light, alarm, timer, and fault diagnosis system; Drive system 4: The drive system 4 is composed of multiple components, including a planetary reducer integrated linear motor 11, drum 12, four-wheel fixed pulley block 13, four-wheel movable pulley block 14, three-wheel fixed pulley block 15, rope clamp 16, and wire rope 17. The drive system 4 is positioned as follows: the four-wheel pulley group 14 is mounted on the middle of the roller wheel axle mechanism 7 via rolling bearings, i.e., the upper part of the frame platform 10, and the remaining components are installed on the lower part of the frame platform 10 (under the vehicle). Planetary reducer integrated linear motor 11: Combined with a controller, it achieves stepless speed regulation with high speed regulation accuracy; using a planetary reducer, it can achieve a large transmission ratio of 100-200; it adopts energy-saving braking to achieve smooth braking without impact; Drum 12: It adopts a single-layer inclined groove type and is connected to the reducer with inner and outer stop flanges. This connection method avoids the problem of uneven force on one side of the rope feed. One end of the wire rope 17 is fixed to the drum 12 by a clamp; Lifting principle: When the platform is raised, the integrated linear motor 11 with planetary reducer drives the drum 12 to rotate counterclockwise. The wire rope 17 is wound around the bottom of the drum 12 in the inclined groove. The wire rope 17 is pulled by the four-wheel fixed pulley group 13 and the four-wheel movable pulley group 14 to slide inward in the track 8. The scissor fork support frame 2 unfolds, driving the lifting platform 1 to complete the vertical lifting action. Conversely, the drum 12 rotates clockwise to realize the descent of the lifting platform 1. In short: the drum 12 winds up the rope, the lifting platform 1 rises, and the drum 12 unwinds the rope, the lifting platform 1 descends. The pulley system uses a combination of 4 fixed pulleys and 4 movable pulleys, thereby increasing the lifting force by 8 times. Rope winding principle: The wire rope 17 is fixed at both ends: one end is fixed to the drum 12 and the other end is fixed to the rope clamp 16; the wire rope 17 is wound from the bottom into the inclined groove, passes through the upper part of the four-wheel fixed pulley group 13, passes through the bottom of the four-wheel movable pulley group 14 and then comes out from its upper part to connect with the upper part of the three-wheel fixed pulley group 15. After repeating this several times, the other end of the wire rope 17 is fixed to the rope clamp 16, and the rope winding is completed; The four-wheel fixed pulley block 13 supports the steel wire rope 17, keeping the bottom of the steel wire rope 17 and the four-wheel movable pulley block 14 horizontal. From the perspective of force analysis, the horizontal tension is consistent with the sliding trajectory of the rolling wheel shaft mechanism 7 in the track 8, resulting in minimal resistance. Walking mechanism 5: It consists of 4 wheel sets, each wheel 18 is equipped with a walking motor 19, forming a wheel set, which drives the wheel 18 to move forward and backward; Location distribution: This system is installed on the lower part of the chassis platform 10, i.e., below the vehicle; Steering mechanism 6: consists of electric telescopic rod 20 and linkage assembly 21; Location distribution: All are installed at the front end of the lower part of the chassis platform 10, that is, at the front end of the vehicle. Principle of turning after getting off the vehicle: An electric telescopic rod 20 is used, which utilizes its telescopic capacity to push or pull the linkage assembly 21 to convert force and realize the left and right steering of the wheel 18. The electric telescopic rod 20 has the following features: it is a linear actuator that realizes the extension and retraction of the screw and sleeve by driving the built-in screw mechanism through a motor; it can achieve precise control of stroke and speed.

[0019] This invention replaces the traditional hydraulically driven lifting platform method by using a pulley system in conjunction with a wire rope traction support frame to raise and lower the work platform. Traditional scissor lifts use a motor pump to drive a hydraulic cylinder to raise and lower the scissor arms, requiring multi-stage conveyor chains, brackets, and numerous long hydraulic hoses. This invention achieves a pollution-free, low-energy-consumption, low-cost, simple-structure, and stable-operating design.

[0020] The driving method of this invention uses a battery to power a motor to drive a built-in drum to pull a steel wire rope. The steel wire rope is wound through multiple sets of moving and fixed pulleys, which greatly reduces the force and ultimately achieves the lifting and lowering of the working platform.

[0021] Key points of the present invention: (1) The combination of fixed pulley and movable pulley is adopted to increase the lifting force by 8 times; (2) The planetary reducer integrated linear motor 11 drives the drum 12 in combination with the pulley group structure, and the lifting of the upper vehicle is controlled by winding and unwinding the wire rope 17.

Claims

1. A scissor-type mobile work platform of a pulley combination drive mode, characterized by, The utility model relates to a kind of lifting platform, it includes lifting platform (1), scissor fork support frame (2) and frame platform (10), track two (9) is installed in the bottom end of the lifting platform (1), track one (8) is welded in the upper end of the frame platform (10), one end of the scissor fork support frame (2) is fixed, and the other end is slid in the track one (8) and track two (9) respectively by the rolling wheel shaft mechanism (7) installed above and below. Control system (3) and drive system (4) are also installed on the frame platform (10).

2. The scissor lift work platform of claim 1, wherein, The control system (3) uses CAN bus control technology, a controller is installed on the frame platform (10), and an operating handle is installed on the lifting platform (1). The frame platform (10) and the lifting platform (1) communicate through CAN bus.

3. The scissor lift work platform of claim 2, wherein, The drive system (4) includes planetary reducer integrated linear motor (11), winding drum (12), four-wheel fixed pulley set (13), four-wheel movable pulley set (14), three-wheel fixed pulley set (15), rope clamp (16) and steel wire rope (17). The planetary reducer integrated linear motor (11) is combined with the controller of the control system (3). The winding drum (12) is connected with the planetary reducer integrated linear motor (11) through inner and outer stop flange. The two ends of the four-wheel fixed pulley set (13) are bolted below the frame platform (10). The four-wheel movable pulley set (14) is sleeved in the middle part of the shaft of the rolling wheel shaft mechanism (7) through rolling bearing. The three-wheel fixed pulley set (15) is installed below the frame platform (10). The steel wire rope (17) is fixed at one end on the winding drum (12) through a clamping plate, and at the other end on the rope clamp (16) after repeatedly winding around the four-wheel fixed pulley set (13), the four-wheel movable pulley set (14) and the three-wheel fixed pulley set (15).

4. The scissor lift work platform of claim 3, wherein, The four-wheel movable pulley set (14) is installed on the upper part of the frame platform (10), and the other components are installed on the lower part of the frame platform (10).

5. The scissor lift work platform of claim 4, wherein, The winding drum (12) adopts single-layer inclined chute type.

6. The platform as claimed in claim 3, wherein, The drive system (4) uses a battery as a power source.

7. The platform as claimed in claim 1, wherein, Two walking mechanisms (5) are installed on the front and rear sides of the lower end of the frame platform (10), and a steering mechanism (6) is connected between the two walking mechanisms (5).

8. The scissor lift work platform of claim 7, wherein, The walking mechanism (5) includes four wheels (18) connected to the frame platform (10), and a walking motor (19) is installed on each wheel (18).

9. The platform as claimed in claim 7, wherein, The steering mechanism (6) includes a connecting rod mechanism assembly (21) installed on the wheels (18) on both sides, and an electric telescopic rod (20) connected to the connecting rod mechanism assembly (21) on one end and connected to the frame platform (10) on the other end.

10. The platform as claimed in claim 1, wherein, The scissor fork support frame (2) has at least four groups.

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