Pothole mechanism and aerial work platform

Abstract

The utility model discloses a pothole mechanism and an aerial work platform, the pothole mechanism comprises a fork frame plate and two pothole protection plates which are symmetrically hinged to the two sides of the bottom of the fork frame plate, and two pressing shafts which are elastically installed on the fork frame plate in the vertical direction are symmetrically arranged in the middle of the fork frame plate; the lower end of the pressing shaft is movably connected with a first connecting rod, the middle of the first connecting rod is hinged to the fork frame plate, the other end of the first connecting rod is hinged to a second connecting rod, the lower end of the second connecting rod is hinged to the pothole protection plate, and a travel switch fixedly installed on the fork frame plate is arranged above the pothole protection plate. And the travel switch is matched with the pothole protection plate. Compared with an existing structure, opening and retracting of the pit protection plate are more labor-saving and stable, the traditional mode that the state of the pit protection plate is indirectly sensed through the state change of the sensing pressing block is optimized into the mode that the state change of the pit protection plate is directly sensed through the travel switch, state sensing is more sensitive and accurate, and safety performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aerial work equipment, in particular to a pothole mechanism and an aerial work platform. Background Art

[0002] The aerial work platform consists of a base vehicle, a platform and a lifting mechanism connecting the two. The base vehicle is used to realize the mobile function, and the lifting mechanism drives the platform to rise and fall, thereby realizing aerial work at different heights. It is widely used in aerial work of various systems such as fire rescue, electricity, street lights, advertising, film shooting, communications, gardening, transportation, industry and mining, docks, as well as installation, maintenance and climbing work in large venues, interior and exterior decoration of factories, ships, civil aviation, steel structures and other industries. When the aerial work platform is operating on a bumpy ground, the wheels are easy to sink into it, and the body of the platform is easy to tilt, and there is a risk of tipping over, resulting in the personal safety of the operators not being guaranteed.

[0003] The Chinese patent application publication number CN 112744762 A discloses a pothole protection device for a scissor-type aerial work platform, which is installed on a fork frame, and the fork frame is installed on the bottom vehicle; it includes a travel switch, a pressure plate, a first elastic member, a second elastic member, two pothole eccentric pressure blocks and two connecting rods, the pressure plate is installed at the center of the fork frame, the first elastic member and the second elastic member are symmetrically arranged along the central axis of the pressure plate, and the two pothole eccentric pressure blocks are respectively installed between one connecting rod and the first elastic member, and the other connecting rod and the second elastic member; one end of the connecting rod is connected to the pothole eccentric pressure block, and the other end is connected to a pothole protection plate that can be opened outward. The pressure plate is separated from the contact with the pothole eccentric pressure block as the fork frame is lifted, and the pothole eccentric pressure block moves downward around the rotation axis under the action of its own weight to stop at the limit plate; the pothole protection plate is pushed to open by the connecting rod to expand the area at the bottom of the fork frame, thereby maintaining the stability of the vehicle and preventing tipping. Two travel switches are provided and installed on the fork frame, corresponding to the two eccentric pothole pressure blocks installed, so as to identify the working state of the pothole protection device by sensing the state change of the eccentric pothole pressure blocks, and then send a signal to the undercarriage to control the speed of the undercarriage, so that the undercarriage can only travel at high speed in a low speed state, and travel at low speed when the platform is raised, to ensure safety.

[0004] The above structure relies on the deadweight of the pothole eccentric pressure block to reset the pothole protection plate. Affected by the weight of the pressure block, when the pressure block is pressed down by the elastic part, the reaction force it bears is relatively large, which can easily cause damage to the elastic part. At the same time, when the elastic part rises, the entire device will shake obviously at the moment of separation from the pressure block, affecting the safety of operation, and the pressure block will swing slightly, resulting in insensitive contact with the travel switch, affecting the switching accuracy of the bottom vehicle speed, and posing certain safety hazards. Utility Model Content

[0005] The utility model aims to propose a pothole mechanism and an aerial work platform in view of the deficiencies of the prior art. The overall structure is simple and the safety performance is improved while realizing the speed sensing switching of the bottom vehicle.

[0006] The technical solution to achieve the purpose of this utility model is:

[0007] A pothole mechanism comprises a fork frame plate and two pothole protection plates symmetrically hinged on both sides of the bottom of the fork frame plate, two pressure shafts elastically mounted on the fork frame plate in the vertical direction are symmetrically arranged in the middle of the fork frame plate, a first connecting rod is movably connected to the lower end of the pressure shaft, the middle part of the first connecting rod is hinged to the fork frame plate and the other end is hinged to the second connecting rod, the lower end of the second connecting rod is hinged to the pothole protection plate, a travel switch fixedly mounted on the fork frame plate is provided above the pothole protection plate, and the travel switch is adapted to the pothole protection plate.

[0008] Furthermore, the pothole protection plate includes a long strip side panel and a first mounting ear, a second mounting ear and an L-shaped connecting seat fixedly mounted on the inner side of the side panel, the first mounting ear and the second mounting ear are respectively arranged on both sides of the L-shaped connecting seat and are parallel to two sides of the L-shaped connecting seat, the lower end of the second connecting rod is hinged between the first mounting ear and one end of the L-shaped connecting seat, and the fork frame plate is hinged between the second mounting ear and the other end of the L-shaped connecting seat.

[0009] Furthermore, an arc-shaped notch is provided at the top of the second mounting ear, and the sensing end of the travel switch faces the arc-shaped notch and matches the arc-shaped notch when the side plate is in a vertical state.

[0010] Furthermore, a shaft sleeve assembly is provided on the fork frame plate, and the shaft sleeve assembly includes a mounting plate fixedly mounted on the fork frame plate and shaft sleeves symmetrically arranged at both ends of the mounting plate, two pressure shafts respectively penetrate the shaft sleeves and are sleeved with springs, and the two ends of the springs are respectively in contact with the top of the shaft sleeve and the top of the pressure shaft.

[0011] Furthermore, a ring-shaped step protruding outward is provided at the bottom of the pressing shaft, and the outer diameter of the ring-shaped step is larger than the inner diameter of the shaft sleeve.

[0012] Furthermore, the outer circumferential surface of the annular step is symmetrically provided with an inwardly recessed plane, the first connecting rod includes two rods arranged with overlapping gaps, the upper end of the rod is provided with a waist-shaped hole and the inner side is respectively fitted with the two planes, and the waist-shaped hole is provided with a pin shaft passing through the lower end of the pressure shaft, and the upper end of the second connecting rod is hinged between the lower ends of the two rods.

[0013] Furthermore, a reinforcement block is fixedly connected between the two rods.

[0014] Furthermore, a buffer pad is provided on the top of the pressing shaft.

[0015] Furthermore, arc-shaped through grooves are symmetrically provided at the bottom of the fork frame plate, and the arc-shaped through grooves correspond to the movement tracks of the hinge points of the first connecting rod and the second connecting rod.

[0016] A high-altitude work platform comprises a base vehicle, a scissor lift mechanism and a telescopic platform which are arranged in sequence from bottom to top, the bottom of the base vehicle is fixedly mounted with the above-mentioned pit mechanism, the top of the base vehicle is provided with a through groove corresponding to the pressure shaft of the pit mechanism, the top of the pressure shaft extends to above the through groove, and the scissor lift mechanism is fixedly mounted with a pressure plate corresponding to the pressure shaft.

[0017] By adopting the above technical solution, the utility model has the following beneficial effects:

[0018] (1) The utility model presses down the pressure shaft through external force, thereby directly driving the pothole protection plate hinged on the fork frame plate to flip and retract through the first connecting rod and the second connecting rod, and maintain a horizontal state, so as not to interfere with the movement of the bottom vehicle. When the external force is removed, the pothole protection plate is driven to flip and extend in the opposite direction through the elastic reset of the pressure shaft, and maintain a vertical state. When encountering potholes on the road surface, it can support the ground to avoid tipping over, thereby playing a pothole protection role. Compared with the existing structure, the opening and retraction of the pothole protection plate is more labor-saving and smooth, and the traditional indirect sensing of the state of the pothole protection plate by the state change of the sensing pressure block is optimized to directly sensing the state change of the pothole protection plate by the travel switch. The state sensing is more sensitive and accurate, thereby improving the safety performance.

[0019] (2) The utility model cleverly arranges an arc-shaped notch so as to match with the sensing end of the travel switch. When the pothole protection plate is in working condition, the sensing end is just located at the arc-shaped notch. When the pothole protection plate rotates, the second mounting ear contacts with the travel switch, thereby triggering the travel switch to control the speed switching of the bottom vehicle.

[0020] (3) The utility model realizes elastic installation of the pressure shaft on the fork frame plate in the vertical direction through the shaft sleeve assembly and the spring, and has a simple structure and low cost.

[0021] (4) The utility model provides an annular boss to prevent the connection point between the pressure shaft and the first connecting rod from hitting the shaft sleeve and affecting its movement.

[0022] (5) The first connecting rod of the utility model adopts two rods, and two planes that fit with the rods are set at the lower end of the pressure shaft to ensure that the first connecting rod is always located in the same plane during the rotation process to avoid jamming.

[0023] (6) The utility model improves the structural strength of the first connecting rod by providing a reinforcing block.

[0024] (7) The utility model reduces the impact noise generated when external force is applied to the top of the pressing shaft by arranging a buffer pad.

[0025] (8) The utility model provides an arc groove as an avoidance groove to prevent slight deviation caused by the transmission of the multi-link mechanism from causing interference with the fork frame plate, thereby improving the stability of the opening and retraction of the pothole protection plate.

[0026] (9) The utility model aerial work platform adopts a brand-new structure of the pit mechanism, which has a simple overall structure. It can improve the safety performance while realizing the speed sensing switching of the bottom vehicle. By setting a pressure block corresponding to the pressure shaft on the scissor lift mechanism, compared with the existing mechanism in which the pressure shaft is hit by the bottom of the telescopic platform, the avoidance design of the scissor lift mechanism is simplified and the structure is more simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the content of the utility model easier to understand, the utility model is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein:

[0028] Figure 1 It is a three-dimensional diagram of the aerial work platform of the utility model;

[0029] Figure 2 It is a three-dimensional diagram of the pothole mechanism of the utility model;

[0030] Figure 3 It is an assembly drawing of the travel switch and the pothole protection plate of the utility model.

[0031] The reference numerals in the accompanying drawings are:

[0032] Bottom vehicle 100, scissor lift mechanism 200, telescopic platform 300;

[0033] Fork frame plate 1, arc-shaped through groove 1-1, pothole protection plate 2, side plate 2-1, first mounting ear 2-2, second mounting ear 2-3, arc-shaped notch 2-3-1, L-shaped connecting seat 2-4, pressure shaft 3, annular step 3-1, plane 3-2, first connecting rod 4, rod 4-1, waist-shaped hole 4-1-1, reinforcement block 4-2, second connecting rod 5, pressure plate 6, travel switch 7, buffer pad 8, sleeve assembly 9, mounting plate 9-1, sleeve 9-2, spring 10. DETAILED DESCRIPTION

[0034] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] (Example 1)

[0036] like Figures 1 to 3The aerial work platform shown in the figure comprises a base vehicle 100, a scissor lift mechanism 200 and a telescopic platform 300 which are arranged in sequence from bottom to top. A pit mechanism is arranged at the bottom of the base vehicle 100, and the pit mechanism comprises a fork frame plate 1 fixedly connected to the base vehicle 100 and two pit protection plates 2 symmetrically hinged on both sides of the bottom of the fork frame plate 1. Two pressing shafts 3 elastically mounted on the fork frame plate 1 in the vertical direction are symmetrically arranged in the middle of the fork frame plate 1. A through groove corresponding to the pressing shaft 3 is arranged on the top of the base vehicle 100. The top of the pressing shaft 3 extends to the top of the through groove, and a first connecting rod 4 is movably connected to the lower end. The middle part of the first connecting rod 4 is hinged to the fork frame plate 1 and the other end is hinged to the second connecting rod 5. The lower end of the second connecting rod 5 is hinged to the pothole protection plate 2. A pressing plate 6 corresponding to the pressure shaft 3 is fixedly installed on the scissor lift mechanism 200. When the scissor lift mechanism 200 descends, the pressing plate 6 applies downward pressure to the pressure shaft 3, thereby directly driving the pothole protection plate 2 hinged on the fork frame plate 1 to flip and retract through the first connecting rod 4 and the second connecting rod 5, and maintain a horizontal state, so as not to interfere with the movement of the bottom vehicle. When the scissor lift mechanism 200 rises, the external force is removed, and the pothole protection plate 2 is driven to flip and extend in the opposite direction through the elastic reset of the pressure shaft 3, and maintain a vertical state, so that when encountering potholes on the road surface, it can support the ground and avoid flipping, thereby playing a role in pothole protection. A travel switch 7 fixedly installed on the back of the fork frame plate 1 is provided above the pothole protection plate 2. The travel switch is adapted to the pothole protection plate 2, so as to directly sense the state change of the pothole protection plate 2, and then send a signal to the bottom vehicle 100 to control the speed switching of the bottom vehicle 100.

[0037] Specifically, a buffer pad 8 is provided on the top of the pressing shaft 3 to reduce the impact noise generated when the pressing plate 6 presses down on the top of the pressing shaft 3.

[0038] A shaft sleeve assembly 9 is provided on the fork frame plate 1, and the shaft sleeve assembly 9 includes a mounting plate 9-1 fixedly mounted on the fork frame plate 1 and shaft sleeves 9-2 symmetrically arranged at both ends of the mounting plate 9-1. Two pressure shafts 3 respectively pass through the shaft sleeves 9-2 and are sleeved with springs 10. The two ends of the spring 10 are respectively in contact with the top of the shaft sleeves 9-2 and the top of the pressure shaft 3, so that the pressure shaft 3 is elastically mounted on the fork frame plate in the vertical direction, with a simple structure and low cost.

[0039] The bottom of the pressure shaft 3 is provided with an annular step 3-1 protruding outward, and the outer diameter of the annular step 3-1 is larger than the inner diameter of the sleeve 9-2, which plays a limiting role to prevent the connection point between the pressure shaft 3 and the first connecting rod 4 from hitting the sleeve 9-2 and affecting its activity. The outer peripheral surface of the annular step 3-1 is symmetrically provided with a plane 3-2 that is recessed inward. The first connecting rod 4 includes two rods 4-1 set with overlapping gaps. The upper end of the rod 4-1 is provided with a waist-shaped hole 4-1-1 and the inner side is respectively fitted with the two planes 3-2. The upper end of the second connecting rod 5 is hinged between the lower ends of the two rods 4-1 to ensure that the first connecting rod 4 is always located in the same plane during the rotation process to avoid jamming. The waist-shaped hole 4-1-1 is provided with a pin 10 that runs through the lower end of the pressure shaft 3, thereby realizing a movable connection. In order to improve the structural strength of the first connecting rod 4, a reinforcing block 4-2 is fixedly connected between the rods 4-1.

[0040] The pothole protection plate 2 includes a side plate 2-1 of a long strip structure, and a first mounting ear 2-2, a second mounting ear 2-3 and an L-shaped connecting seat 2-4 fixedly mounted on the inner side of the side plate 2-1. The first mounting ear 2-2 and the second mounting ear 2-3 are respectively arranged on both sides of the L-shaped connecting seat 2-4 and are parallel to the two sides of the L-shaped connecting seat 2-4. The lower end of the second connecting rod 5 is hinged between the first mounting ear 2-2 and one end of the L-shaped connecting seat 2-4, and the fork frame plate 1 is hinged between the second mounting ear 2-3 and the other end of the L-shaped connecting seat 2-4. The top of the second mounting ear 2-3 is provided with an arc-shaped notch 2-3-1, and the sensing end of the travel switch 7 is opposite to the arc-shaped notch 2-3-1 and is adapted to the arc-shaped notch when the side plate is in a vertical state. By setting a gap between the sensing end and the arc-shaped notch, it is achieved that when the pothole protection plate 2 is in working state, the sensing end is exactly located at the arc-shaped notch. When the pothole protection plate rotates, the second mounting ear contacts the travel switch, thereby triggering the travel switch to control the speed switching of the bottom vehicle.

[0041] An arcuate through groove 1-1 is symmetrically provided at the bottom of the fork frame plate 1, and the arcuate through groove 1-1 corresponds to the movement trajectory of the hinge point of the first link 4 and the second link 5. By setting the arcuate groove as an avoidance groove, slight deviation caused by the transmission of the multi-link mechanism can be prevented from interfering with the fork frame plate, thereby improving the stability of the opening and retraction of the pothole protection plate.

[0042] In this embodiment, the pressure plate 6 presses the pressure shaft 3, thereby directly driving the pothole protection plate 2 hinged on the fork frame plate 1 to flip and retract through the first connecting rod 4 and the second connecting rod 5, and maintain a horizontal state, so as not to interfere with the movement of the bottom vehicle, and when the external force is removed, the pothole protection plate is driven to flip and extend in the opposite direction through the elastic reset of the pressure shaft, and maintain a vertical state, so that when encountering a pothole road surface, it can support the ground to avoid flipping over, thereby playing a pothole protection role. Compared with the existing structure, the opening and retraction of the pothole protection plate is more labor-saving and smooth, and the traditional indirect sensing of the state change of the pothole protection plate by the sensing pressure block is optimized to directly sensing the state change of the pothole protection plate by the travel switch. The state sensing is more sensitive and accurate, thereby improving the safety performance.

[0043] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pothole mechanism, characterized in that: It includes a fork frame plate and two pothole protection plates symmetrically hinged on both sides of the bottom of the fork frame plate, two pressure shafts elastically installed on the fork frame plate in the vertical direction are symmetrically provided in the middle of the fork frame plate, the lower end of the pressure shaft is movably connected with a first connecting rod, the middle part of the first connecting rod is hinged to the fork frame plate and the other end is hinged to a second connecting rod, the lower end of the second connecting rod is hinged to the pothole protection plate, and a travel switch fixedly installed on the fork frame plate is provided above the pothole protection plate, and the travel switch is adapted to the pothole protection plate.

2. A pothole mechanism according to claim 1, characterized in that: The pothole protection plate includes a long strip side panel and a first mounting ear, a second mounting ear and an L-shaped connecting seat fixedly mounted on the inner side of the side panel, the first mounting ear and the second mounting ear are respectively arranged on both sides of the L-shaped connecting seat and are parallel to two sides of the L-shaped connecting seat, the lower end of the second connecting rod is hinged between the first mounting ear and one end of the L-shaped connecting seat, and the fork frame plate is hinged between the second mounting ear and the other end of the L-shaped connecting seat.

3. A pothole mechanism according to claim 2, characterized in that: An arc-shaped notch is arranged on the top of the second mounting ear, and the sensing end of the travel switch faces the arc-shaped notch and matches the arc-shaped notch when the side plate is in a vertical state.

4. A pothole mechanism according to claim 1, characterized in that: The fork frame plate is provided with a shaft sleeve assembly, which includes a mounting plate fixedly mounted on the fork frame plate and shaft sleeves symmetrically arranged at both ends of the mounting plate, two pressure shafts respectively penetrate the shaft sleeves and are sleeved with springs, and the two ends of the springs are respectively in contact with the top of the shaft sleeve and the top of the pressure shaft.

5. A pothole mechanism according to claim 4, characterized in that: The bottom of the pressing shaft is provided with an annular step protruding outwards, and the outer diameter of the annular step is larger than the inner diameter of the shaft sleeve.

6. A pothole mechanism according to claim 5, characterized in that: The outer circumference of the annular step is symmetrically provided with an inwardly recessed plane. The first connecting rod includes two rods arranged with overlapping gaps. The upper end of the rod is provided with a waist-shaped hole and the inner side is respectively fitted with two planes. A pin shaft passing through the lower end of the pressure shaft is provided in the waist-shaped hole. The upper end of the second connecting rod is hinged between the lower ends of the two rods.

7. A pothole mechanism according to claim 6, characterized in that: A reinforcement block is fixedly connected between the two rods.

8. A pothole mechanism according to claim 1, characterized in that: A buffer pad is arranged on the top of the pressing shaft.

9. A pothole mechanism according to claim 1, characterized in that: The bottom of the fork frame plate is symmetrically provided with arc-shaped through grooves, and the arc-shaped through grooves correspond to the movement tracks of the hinge points of the first connecting rod and the second connecting rod.

10. An aerial work platform, characterized in that: The invention comprises a bottom vehicle, a scissor lift mechanism and a telescopic platform which are arranged in sequence from bottom to top, wherein the bottom of the bottom vehicle is fixedly installed with a pothole mechanism as claimed in any one of claims 1 to 9, The top of the bottom vehicle is provided with a through slot corresponding to the pressure shaft of the pit mechanism, and the top of the pressure shaft extends to above the through slot. A pressing plate corresponding to the pressing shaft is fixedly mounted on the scissor lift mechanism.

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