Rotary nut type electric cylinder for lifting aerial work platform

Abstract

The utility model relates to the technical field of high-altitude operation equipment, in particular to a rotating nut type electric cylinder for lifting a high-altitude operation platform, which comprises a motor, a gear box and a cylinder body, a lead screw and a lead screw nut are arranged in the cylinder body, the cylinder body comprises a nut shell and a fixed sleeve which are connected together, and the motor is supported on the fixed sleeve. The nut shell is connected with the gearbox, the lead screw nut is rotationally assembled in the nut shell, and a gear transmission mechanism in transmission connection with the motor and the lead screw nut is arranged in the gearbox. The side, back on to the nut shell, of the gearbox is connected with a telescopic cover connected with the lead screw. The end, away from the nut shell, of the fixing sleeve is connected with a first sleeve, the lead screw is movably assembled in the fixing sleeve in a guiding mode, the end, away from the first sleeve, of the lead screw penetrates through the telescopic cover and is connected with a second sleeve, and the first sleeve and the second sleeve are used for penetrating through pin shafts hinged to the shear fork arms. The utility model has the advantages of low manufacturing cost, good stress effect and high safety when being applied to the aerial work platform.

Description

Technical Field

[0001] The utility model relates to the technical field of aerial work equipment, in particular to a rotating nut-type electric cylinder used for lifting aerial work platforms. Background Art

[0002] The most widely used aerial work platform at present is the scissor-type work platform. Its scissor-type mechanical structure makes the lifting of the work platform more stable and safer. It is equipped with a drive system that can move efficiently and flexibly, thus providing a guarantee for high-efficiency work. The scissor-type mechanical mechanism often uses an electric cylinder as a drive component to drive the expansion and retraction of the scissor arms, thereby realizing the lifting of the work platform. Due to the limitation of the installation space of the aerial work platform, its structure can only be made into a form of blind holes on both sides of the electric cylinder, such as Figure 1 and Figure 2 As shown, blind holes 101 are opened on both sides of the cylinder body of the electric cylinder, and each blind hole 101 is hinged to the corresponding support ear 103 by passing a pin shaft 102. This installation method has very high processing accuracy requirements for each component. It is easy to cause only one side of the overall double-sided support ears to be stressed due to low processing accuracy, resulting in deformation and damage of the support ears and single-sided pin shafts. At the same time, the installation method of the pin shafts on both sides increases the overall assembly difficulty and increases the manufacturing cost; after the two pin shafts are disconnected and hinged, the structural strength of the entire platform will be reduced, which is easy to cause safety hazards during construction.

[0003] In addition, most existing electric cylinder structures use an electric cylinder for lifting aerial work platforms disclosed in a Chinese patent with authorization announcement number CN220976503U. The electric cylinder includes a housing, a motor, and a screw-nut mechanism mounted on the housing. The screw-nut mechanism includes an outer tube fixed to the housing and a ball screw located in the outer tube that can rotate about its own axis. The ball screw extends up and down and is connected to the motor. A nut is installed on the guide slide inside the outer tube. The nut and the ball screw cooperate with each other, and the ball screw drives the nut to move back and forth. The nut is fixed with a push rod mounted on the outside of the ball screw. The push rod moves back and forth under the drive of the nut, and can drive the scissor arms to expand and retract. Since the screw nut moves together with the push rod, it is necessary to set a protective shell on the outside of the screw nut with a length at least greater than the active stroke of the screw nut and a height that matches the outer diameter of the screw nut. In addition, the active stroke of the screw nut is small, the overall structural size is large, and the manufacturing cost is high. Utility Model Content

[0004] The purpose of the utility model is to provide a rotating nut-type electric cylinder for lifting and lowering aerial work platforms, so as to solve the technical problems of high manufacturing cost of existing electric cylinders and poor overall force effect when used on aerial work platforms, which may lead to potential safety hazards.

[0005] To solve the above problems, the utility model provides a nut-type electric cylinder for lifting and lowering aerial work platforms, which adopts the following technical solutions:

[0006] A rotating nut-type electric cylinder for lifting an aerial work platform comprises a motor, a gear box and a cylinder body, wherein a lead screw and a lead screw nut threadedly connected to the lead screw are provided in the cylinder body, the cylinder body comprises a nut housing and a fixed sleeve connected together, the motor is supported on the fixed sleeve, the nut housing is connected to the gear box, the lead screw nut is rotatably assembled in the nut housing, and a gear transmission mechanism that is transmission-connected to the motor and the lead screw nut is provided in the gear box; a telescopic cover that can be telescoped along the axial direction of the lead screw is connected to the side of the gear box facing away from the nut housing, and the telescopic cover is connected to the lead screw; an end of the fixed sleeve away from the nut housing is connected to a first sleeve, the lead screw is guide-movably assembled in the fixed sleeve and the end away from the first sleeve passes through the telescopic cover and is connected to a second sleeve, the first sleeve and the second sleeve are used to pass through a pin shaft hingedly connected to the scissor arm.

[0007] Furthermore, the gear transmission mechanism includes a driving gear and a driven gear, the driving gear is meshed with the driven gear, and the driven gear is coaxially connected to the outside of the screw nut.

[0008] Furthermore, the screw nut is provided with a first bearing, a second bearing and a third bearing arranged at intervals along the axial direction of the screw. The first bearing and the second bearing are both installed in the nut housing, the third bearing is installed in the gear box, and the driven gear is located between the second bearing and the third bearing.

[0009] Furthermore, the output shaft of the motor is transmission-connected with a speed limiting brake and a reducer, the reducer is connected to the gear box, and the output shaft of the reducer is transmission-connected with the driving gear.

[0010] Furthermore, the gear box is provided with a hand-cranked device plugging port, the axis of the hand-cranked device plugging port coincides with the rotation axis of the driving gear, a plug is detachably connected to the hand-cranked device plugging port, and the driving gear is provided with a hand-cranked device interface corresponding to the hand-cranked device plugging port for connecting to the hand-cranked device.

[0011] Furthermore, the motor is a brushless DC motor.

[0012] Furthermore, a positioning step is provided at one end of the fixing sleeve close to the nut housing, and a clamping flange is provided at the positioning step, which is welded to the sleeve and used to clamp the nut housing onto the gear box. The clamping flange is connected to the nut housing by screws.

[0013] Furthermore, the telescopic cover is a nylon cover.

[0014] Furthermore, a manual release brake is provided at the tail of the motor, and a pull rope is tied to the manual release brake.

[0015] Furthermore, a fixing bracket is installed on the top of the motor, and a mounting opening is provided on the fixing bracket which passes through the fixing bracket in a direction perpendicular to the screw; a U-shaped bracket is provided outside the motor for supporting the motor, and the bottom of the U-shaped bracket is connected to a hoop which is sleeved outside the fixing sleeve, and the top two ends of the U-shaped bracket are connected to pressure plates which pass through the mounting opening and press against the motor.

[0016] The beneficial effects of the nut-turning electric cylinder for aerial work platforms of the utility model are:

[0017] 1. The utility model adopts a rotating nut type electric cylinder with a sleeve-type structure on both sides, which changes the installation method of the electric cylinder, that is, the blind holes on both sides are changed to a single pin hole, so that the connection method of the electric cylinder in the whole machine is changed from being hinged by two pin shafts to being hinged by a single pin shaft through-type. This installation form reduces the processing accuracy requirements of parts and components, and the manufacturing cost is lower. During installation, it is only necessary to insert the pin shaft from one side, which reduces the installation difficulty. Through the single pin shaft hinge, the connection structure strength of this part is increased, and the overall rigidity is increased. When the scissor arm series aerial work platform is lifted or lowered, the operation process is smooth, which greatly increases the stability of the whole machine operation and reduces the safety hazards of personnel during operation.

[0018] 2. The rotating nut type electric cylinder adopts the method of rotating the screw nut and moving the screw horizontally to realize the expansion and lifting of the scissor fork arm. Compared with the existing electric cylinder in which the screw nut moves horizontally and the screw rotates, in the utility model, the radial dimension of the fixed sleeve outside the screw is smaller, and when the screw moves, the telescopic cover can protect the protruding part of the screw. At the same time, when the screw is retracted, the telescopic cover can be folded. Compared with the existing electric cylinder, the rotating nut type electric cylinder of the utility model has a smaller overall structural size and lower manufacturing cost while achieving the same active stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0020] Figure 1 This is a schematic diagram of the installation of an electric cylinder in the prior art;

[0021] Figure 2 for Figure 1 AA cross-sectional view;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of a rotary nut type electric cylinder used for lifting an aerial work platform according to the present invention;

[0023] Figure 4 for Figure 3 The main view;

[0024] Figure 5 for Figure 3 A top view of

[0025] Figure 6 for Figure 5 BB cross-sectional view;

[0026] Figure 7 for Figure 6 A partial enlarged schematic diagram of the structure;

[0027] Figure 8 This is a schematic diagram of the extension of the rotary nut type electric cylinder used for lifting the aerial work platform of the utility model;

[0028] Figure 9 This is a plan view of the utility model after being installed on an aerial work platform;

[0029] Figure 10 This is a three-dimensional schematic diagram of the utility model installed on an aerial work platform;

[0030] Figure 11 for Figure 10 CC cross-sectional view.

[0031] Description of reference numerals:

[0032] 101. Blind hole; 102. Pin; 103. Support ear; 104. Cylinder body; 1. Motor; 2. Gearbox; 3. Cylinder body; 4. Screw; 5. Screw nut; 6. Nut housing; 7. Fixed sleeve; 8. Telescopic cover; 9. First sleeve; 10. Second sleeve; 11. Reducer; 12. Speed ​​limiting brake; 13. Plug; 14. Driving gear; 15. Driven gear; 16. First bearing; 17. Second bearing; 18. Third bearing; 19. Positioning step; 20. Holding flange; 21. Manual release brake; 22. U-shaped bracket; 23. Hoop; 24. Pressure plate; 25. Fixed bracket; 26. Scissor arm; 27. Aerial work platform; 28. Support ear at the moving end; 29. ​​Support ear at the fixed end; 30. Pin; 31. Brake housing. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0034] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0035] The embodiment of the rotary nut type electric cylinder provided by the utility model for lifting the aerial work platform is as follows:

[0036] like Figure 3 、 Figure 4 and Figure 5 As shown, a rotating nut type electric cylinder for lifting an aerial work platform includes a motor 1, a gear box 2, a cylinder body 3, a reducer 11, a speed limiting brake 12 and a telescopic cover 8.

[0037] Specifically, such as Figure 4 、 Figure 6 and Figure 7 As shown, the cylinder body 3 includes a nut housing 6 and a fixed sleeve 7. A positioning step 19 is provided at one end of the fixed sleeve 7 near the nut housing 6. A clamping flange 20 welded to the fixed sleeve 7 is provided at the positioning step 19. The clamping flange 20 presses the nut housing 6 onto the gear box 2. The clamping flange 20 is connected to the nut housing 6 by screws to achieve detachable assembly of the fixed sleeve 7 and the nut housing 6. The gear box 2 and the nut housing 6 are connected by screws. The telescopic cover 8 is a nylon cover and is set on the side of the gear box 2 facing away from the nut housing 6. The end of the telescopic cover 8 near the gear box 2 is provided with a mounting flange for clamping the telescopic cover 8. The mounting flange is connected to the gear box 2 by screws, thereby assembling the gear box 2 and the telescopic cover 8 together. Figure 8 As shown, the telescopic cover 8 can be extended and retracted along the axial direction of the fixed sleeve 7.

[0038] The end of the fixed sleeve 7 away from the nut housing 6 is welded to the first sleeve 9, and the fixed sleeve 7 is coaxially guided and movable with the screw 4. The end of the screw 4 away from the first sleeve 9 passes through the telescopic cover 8 and is connected to the second sleeve 10. Figure 11 As shown, the first sleeve 9 and the second sleeve 10 are used to pass through a pin shaft 30 that is hingedly connected to the scissor arm 26 .

[0039] A screw nut 5, threadedly connected to the screw 4, is mounted within the nut housing 6. Also fixed within the nut housing 6 are a first bearing 16 and a second bearing 17, spaced apart along the axis of the screw 4. Both the first bearing 16 and the second bearing 17 are coaxially connected to the outside of the screw nut 5 to enable rotational assembly of the screw nut 5 and the nut housing 6. One end of the screw nut 5 extends into the gearbox 2, and a third bearing 18 is coaxially connected to the outside of this end. The third bearing 18 is fixed within the gearbox 2.

[0040] like Figure 3 and Figure 4As shown, a fixing bracket 25 is mounted on the top of the motor 1, and a mounting opening is provided on the fixing bracket 25, which extends perpendicularly to the screw. A U-shaped bracket 22 is provided on the outside of the motor 1 for supporting the motor 1. The bottom of the U-shaped bracket 22 is connected to a hoop 23 that is sleeved on the outside of the fixed sleeve 7. The top ends of the U-shaped bracket 22 are connected to pressure plates 24 that pass through the mounting opening and press against the motor 1, thereby fixing the motor 1 relative to the fixed sleeve 7. The output shaft of the motor 1 is transmission-connected to the speed limiting brake 12 and the reducer 11. The speed limiting brake 12 has a brake housing 31 on the outside. The motor 1 is fixedly connected to the brake housing 31, and the reducer 11 is fixedly connected to the gearbox 2. A gear transmission mechanism is provided in the gearbox 2 to transmit the power of the motor 1 to the screw nut 5. The gear transmission structure includes a driving gear 14 and a driven gear 15. The driving gear 14 is meshed with the driven gear 15. The driven gear 15 is located between the second bearing 17 and the third bearing 18 and is coaxially connected to the outside of the screw nut 5. The driving gear 14 is transmission-connected to the output end of the reducer 11.

[0041] In this embodiment, motor 1 utilizes a brushless DC motor 1 with low-voltage control, making it fully compatible with various aerial work platform electronic control systems. A manual release brake 21 is provided at the rear of motor 1, with a pull cord attached. When the work platform's battery is depleted or the power fails, the pull cord can be used to release the brake, allowing the aerial work platform 27 to descend. The speed limiting brake 12 is configured so that if motor 1 stalls for any reason, the recovery speed of screw 4 increases, and the speed of speed limiting brake 12 increases. Centrifugal force throws the brake block toward the outer tube wall, where it contacts the outer tube wall and generates frictional resistance torque. When the speed reaches a predetermined value, the reverse driving torque balances the resistance torque, maintaining a constant speed before descending at a uniform rate, ensuring the safety of people or objects.

[0042] In addition, the gear box 2 is provided with a hand crank device plugging port, the axis of the hand crank device plugging port coincides with the rotation axis of the driving gear 14, and the hand crank device plugging port is detachably connected to a plug 13, such as Figure 6 and Figure 7 As shown, the driving gear 14 is provided with a hand crank interface corresponding to the hand crank plug for connecting to the hand crank. When the work platform battery is exhausted or the power is cut off due to a fault, the plug 13 is removed and the end of the device capable of driving the driving gear 14 can be inserted through the hand crank plug into the hand crank interface on the driving gear 14. The driving gear 14 can then be manually rotated to achieve the work platform's lifting and lowering.

[0043] The utility model of the electric cylinder of the rotating nut type used for lifting the aerial work platform is installed as follows: Figure 9 、 Figure 10 and Figure 11As shown, the first sleeve 9 and the second sleeve 10 are respectively connected to the movable end lug 28 and the fixed end lug 29 through a pin shaft 30. The movable end lug 28 and the fixed end lug 29 are fixed to the corresponding connecting rods of the aerial work platform scissor arm 26. During operation, after receiving the power supply and signal input from the aerial work platform lifting system, the motor 1 runs forward and reverse at a certain speed, driving the speed limit brake 12 to rotate forward and reverse. At the same time, it drives the reducer 11 to rotate. The reducer 11 reduces the speed of the motor 1 and increases the torque output, driving the driving gear 14 to rotate forward and reverse. The driving gear 14 engages with the driven gear 15, driving the driven gear 15 to rotate forward and reverse. The driven gear 15 drives the nut forward and reverse, thereby driving the screw 4 and the movable end lug 28 to extend and retract in a straight line along the axial direction. The extension and retraction of the movable end lug 28 can drive the aerial work platform 27 to rise and fall.

[0044] Compared with the existing electric cylinder, the rotary nut type electric cylinder for lifting the aerial work platform of the utility model changes the installation form and transmission form, reduces the overall structural size, reduces the processing accuracy requirements of the parts, reduces the installation difficulty and manufacturing cost, increases the connection structure strength of the hinged part, increases the overall rigidity, and thus ensures the stability of the lifting of the aerial work platform 27 and the safety of personnel.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotary nut type electric cylinder for lifting an aerial work platform, comprising a motor, a gear box and a cylinder body, wherein a lead screw and a lead screw nut threadedly connected to the lead screw are provided in the cylinder body, characterized in that: The cylinder body includes a nut housing and a fixed sleeve connected together, the motor is supported on the fixed sleeve, the nut housing is connected to the gear box, the screw nut is rotatably assembled in the nut housing, and the gear box is provided with a gear transmission mechanism that is transmission-connected to the motor and the screw nut; A telescopic cover that can be extended and retracted along the axis of the lead screw is connected to the side of the gear box facing away from the nut housing, and the telescopic cover is connected to the lead screw; The end of the fixed sleeve away from the nut housing is connected to the first sleeve, and the screw guide is assembled in the fixed sleeve and the end away from the first sleeve passes through the telescopic cover and is connected to the second sleeve. The first sleeve and the second sleeve are used to pass through the pin shaft hingedly connected to the scissor arm.

2. The nut-type electric cylinder for lifting an aerial work platform according to claim 1 is characterized in that: The gear transmission mechanism includes a driving gear and a driven gear, the driving gear is meshed with the driven gear, and the driven gear is coaxially connected to the outside of the lead screw nut.

3. The nut-type electric cylinder for lifting an aerial work platform according to claim 2 is characterized in that: The screw nut is provided with a first bearing, a second bearing and a third bearing arranged at intervals along the axial direction of the screw. The first bearing and the second bearing are both installed in the nut housing, the third bearing is installed in the gear box, and the driven gear is located between the second bearing and the third bearing.

4. The nut-type electric cylinder for lifting an aerial work platform according to claim 2 is characterized in that: The output shaft of the motor is connected to a speed limiting brake and a reducer, the reducer is connected to a gear box, and the output shaft of the reducer is connected to the driving gear.

5. A nut-type electric cylinder for lifting an aerial work platform according to any one of claims 2 to 4, characterized in that: The gear box is provided with a hand-cranked device plugging port, the axis of the hand-cranked device plugging port coincides with the rotation axis of the driving gear, a plug is detachably connected to the hand-cranked device plugging port, and the driving gear is provided with a hand-cranked device interface corresponding to the hand-cranked device plugging port for connecting to the hand-cranked device.

6. A nut-type electric cylinder for lifting an aerial work platform according to any one of claims 1 to 4, characterized in that: The motor is a brushless DC motor.

7. A nut-type electric cylinder for lifting an aerial work platform according to any one of claims 1 to 4, characterized in that: A positioning step is provided at one end of the fixing sleeve close to the nut housing. A clamping flange welded to the sleeve and used to clamp the nut housing onto the gear box is provided at the positioning step. The clamping flange is connected to the nut housing by screws.

8. A nut-type electric cylinder for lifting an aerial work platform according to any one of claims 1 to 4, characterized in that: The telescopic cover is a nylon cover.

9. A nut-type electric cylinder for lifting an aerial work platform according to any one of claims 1 to 4, characterized in that: The tail of the motor is provided with a manual release brake, and a pull rope is tied to the manual release brake.

10. The nut-type electric cylinder for lifting an aerial work platform according to claim 9, characterized in that: A fixing bracket is installed on the top of the motor, and a mounting opening is provided on the fixing bracket which passes through the fixing bracket in a direction perpendicular to the screw; a U-shaped bracket is provided outside the motor for supporting the motor, and the bottom of the U-shaped bracket is connected to a hoop which is sleeved on the outside of the fixing sleeve, and the top two ends of the U-shaped bracket are connected to pressure plates which pass through the mounting opening and press against the motor.

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