Anti-overloading mechanism of lifting platform

Abstract

The utility model relates to an anti-overloading mechanism of a lifting platform. The anti-overloading mechanism comprises a platform outer frame, a bottom plate, a top plate, an arch plate and a plurality of gravity sensors. A profiled groove is formed in the upper end face of the platform outer frame, the bottom plates are fixed to the bottom of the profiled groove, the top plates are arranged over the bottom plates, and the arch plates are arranged between the bottom plates and the top plates. A cambered surface groove is formed in the middle of the lower end surface of the top plate. The left end and the right end of the arch plate are opposite to the left inner wall and the right inner wall of the sinking groove, and the upwards-protruding curved surface of the arch plate makes contact with the inner bottom face of the cambered surface groove. The bottom plate and the top plate are fixed into a whole, and a vertical interval is formed between the opposite faces of the bottom plate and the top plate. And studs correspondingly matched with the pressure sensors are distributed on the bottom surface of the groove structure formed on the bottom plate. And a screw ring is arranged at the lower part of the pressure sensor and is matched with the stud. A probe of the pressure sensor can contact with the lower end face of the top plate. When the lifting platform is overloaded, the overload warning device can give out a warning in time, and the safety and the reliability of operation of the lifting platform can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting platforms, and particularly relates to an overload prevention mechanism for a lifting platform. Background Art

[0002] As a lifting device widely used in factories, warehouses, docks and other places, a lifting workbench can provide reliable support for high-altitude operation and maintenance, as well as cargo lifting. Existing lifting platforms are mainly divided into various forms such as fixed type, mobile type, guide rail type, articulated boom type, scissor type, chain type, loading and unloading platform, etc. However, in existing lifting platforms, regardless of their specific structural form, transmission form, etc., the involved lifting platforms generally lack overload prevention devices and cannot give timely reminders when the pressure load borne by the lifting platform is too large, which is likely to cause deformation of mechanical components due to excessive overall load of the lifting platform, and deterioration of mechanical properties such as mechanical strength and rigidity, thus having an adverse impact on the stability and safety of the lifting platform and even easily leading to the occurrence of safety accidents.

[0003] The utility model aims at a scissor-type lifting platform and relates to an overload prevention mechanism that can play an overload warning role. Summary of the Utility Model

[0004] To achieve the above object, the utility model provides an overload prevention mechanism for a lifting platform, which can give a timely reminder when the load borne by the lifting platform exceeds the design value or the warning threshold, helps to ensure the safety and reliability of the operation of the lifting platform, and effectively avoids the occurrence of safety hazards caused by overload.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an overload prevention mechanism for a lifting platform, including a platform outer frame, a bottom plate, a top plate, an arch plate and a plurality of gravity sensors, the lower part of which is hinged and matched with the upper end of a scissor rod frame.

[0006] A shaped groove is formed on the upper end surface of the platform outer frame. The bottom plate is placed in the shaped groove and fixed at the bottom of the shaped groove. The top plate is relatively arranged directly above the bottom plate, and the arch plate is relatively arranged between the bottom plate and the top plate.

[0007] A sunken groove is formed on the upper end surface of the bottom plate, and an arc-shaped groove is formed in the middle of the lower end surface of the top plate.

[0008] The left and right ends of the arch plate respectively lean against the left inner wall and the right inner wall of the sunken groove, and the upper protruding curved surface of the arch plate can contact the inner bottom surface of the arc-shaped groove.

[0009] The bottom plate and the top plate are fixedly connected into one body by bolts or studs, and a vertical distance is formed between the opposite surfaces of the bottom plate and the top plate.

[0010] When the top plate is fixed to the bottom plate by bolts or studs, the pressure exerted by the bolts or studs on the top plate can force the arch plate to deform, so that the left and right ends of the arch plate are respectively in contact with the left inner wall and the right inner wall of the sunk groove. When a heavy load is borne on the upper end surface of the top plate, the heavy load can press the top plate to move downward, prompting the arch plate to undergo elastic deformation, and reducing the vertical distance between the top plate and the bottom plate.

[0011] A groove structure is formed on the bottom plate, and studs corresponding to the pressure sensors one by one are distributed on the bottom surface of the groove structure. A screw ring is fixedly arranged at the lower part of the pressure sensor, and the screw ring is matched with the stud, so that the height position of the detection head at the upper end of the pressure sensor can be adjusted.

[0012] The detection head of the pressure sensor can be in contact with the lower end surface of the top plate.

[0013] Optionally, both the left end surface and the right end surface of the arch plate are formed as curved surfaces, such as semi-cylindrical curved surfaces.

[0014] Optionally, the arch plate includes a plurality of arched strips, and the plurality of arched strips are distributed at intervals in the front-rear direction. The left end and the right end of the arched strip are respectively in corresponding match with the left inner wall and the right inner wall of the sunk groove.

[0015] Optionally, a plurality of long strip-shaped through grooves extending in the left-right direction are formed on the arch plate, and the long strip-shaped through grooves are distributed at intervals in the front-rear direction.

[0016] Optionally, the groove structure is a side groove formed at the edge of the upper end surface of the bottom plate, and the studs are arranged on the bottom surface of the side groove and are distributed at intervals in a circle.

[0017] Optionally, a plurality of channels are provided on the side wall of the platform outer frame, and the channels communicate with the shaped grooves. The channels can respectively correspond to the screw rings arranged at the lower parts of the respective pressure sensors, so that tools can be inserted into the shaped grooves through the channels to screw the screw rings, thereby realizing the adjustment of the height position of the pressure sensors.

[0018] The beneficial effects of the present utility model are as follows: When the load borne by the lifting platform exceeds the design value or the warning threshold, the present utility model can give a timely reminder, which helps to avoid the operation of the lifting platform under the state of bearing an overweight load, and prevent adverse situations such as deformation of the mechanical components of the lifting platform, deterioration of strength and rigidity, etc., thereby helping to ensure the safety and reliability of the operation of the lifting platform. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0020] Figure 2 is Figure 1 a partial enlarged structural schematic diagram at position A in

[0021] Figure 3 a top view structural schematic diagram of the lifting platform.

[0022] In the figure: 10 is the outer frame of the platform, 11 is the channel, 12 is the cover plate; 20 is the scissor rod frame; 30 is the bottom plate, 31 is the sunken groove, 32 is the side groove, 33 is the stud, 34 is the screw ring; 40 is the top plate, 41 is the arc surface groove; 50 is the arch plate; 60 is the pressure sensor. Specific embodiments

[0023] The structures, ratios, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have technical essential meanings. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "front", "rear", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the implementation scope of the present utility model. The change or adjustment of their relative relationships, without substantial change of the technical content, should also be regarded as the implementable scope of the present utility model.

[0024] Such as Figures 1 to 3 shown, the overload prevention mechanism of the lifting platform includes the platform outer frame 10, the bottom plate 30, the top plate 40, the arch plate 50 and a plurality of gravity sensors 60, the lower part of which is hinged and matched with the upper end of the scissor rod frame 20.

[0025] A shaped groove is formed on the upper end surface of the platform outer frame 10. The bottom plate 30 is placed in the shaped groove and is firmly fixed at the bottom of the shaped groove, so that the lower end surface (flat surface) of the bottom plate 30 is in close contact with the inner bottom surface (also a flat surface) of the shaped groove. The top plate 40 is relatively arranged directly above the bottom plate 30, and the arch plate 50 is relatively arranged between the bottom plate 30 and the top plate 40.

[0026] A sunken groove 31 is formed on the upper end surface of the bottom plate 30, and an arc surface groove 41 is formed in the middle of the lower end surface of the top plate 40. The left and right ends of the arch plate 50 respectively lean against the left inner wall and the right inner wall of the sunken groove 31, and the upward convex curved surface of the arch plate 50 can contact the inner bottom surface of the arc surface groove 41.

[0027] The bottom plate 30 and the top plate 40 are fixedly connected as a whole by bolts or studs, and a vertical distance is formed between the opposite surfaces of the bottom plate 30 and the top plate 40. A light hole through which the screw rod of the bolt or the column rod of the stud passes is provided on the top plate 40, and a threaded hole is provided on the bottom plate 30 directly below the light hole. The end of the bolt or stud can be matched with the threaded hole to fixedly connect the top plate 40 and the bottom plate 30. Since an arch plate 50 is provided between the bottom plate 30 and the top plate 40, and the arch plate 50 can act with an elastic supporting force between the two (i.e., the bottom plate 30 and the top plate 40) to make the vertical distance formed between the opposite surfaces of the two (i.e., the bottom plate 30 and the top plate 40) an elastically variable vertical distance.

[0028] When the top plate 40 is fixed to the bottom plate 30 by bolts or studs, the pressure exerted by the bolts or studs on the top plate 40 can force the arch plate 50 to deform, so that the left and right ends of the arch plate 50 are respectively in contact with the left inner wall and the right inner wall of the sunk groove 31. When a heavy load is borne on the upper end surface of the top plate 40, the heavy load can press the top plate 40 to move downward, prompting the arch plate 50 to elastically deform, so that the vertical distance between the top plate 40 and the bottom plate 30 becomes smaller (a small amount).

[0029] Studs 33 corresponding to the pressure sensors 60 one by one are provided and distributed on the bottom surface of the edge groove 32 formed at the edge of the upper end surface of the bottom plate 30, and the studs 33 are distributed at intervals in a circle on the bottom surface of the edge groove 32.

[0030] A screw ring 34 is fixedly provided at the lower part of the pressure sensor 60, and the screw ring 34 is matched with the stud 33, so that the screw ring 34 can be screwed to adjust the height position of the detection head on the upper end side of the pressure sensor 60, so that the detection head of the pressure sensor 60 can be in contact with the lower end surface of the top plate 40.

[0031] A plurality of channels 11 are provided on the side wall of the platform outer frame 10, and the channels 11 communicate with the shaped grooves. The channels 11 can respectively correspond to the screw rings 34 provided at the lower parts of the respective pressure sensors 60, and tools can be inserted into the shaped grooves through the channels 11 to screw the screw rings 34, so as to realize the adjustment of the height positions of the pressure sensors 60. On the one hand, it can ensure that the upper end side probes of the respective pressure sensors 60 are in contact with the lower end surface of the top plate 40, and on the other hand, it can control the consistency of the initial states of the respective pressure sensors 60, which is beneficial to processing the sensing signals of the multiple pressure sensors connected in association, so as to accurately know the load-bearing situation of the lifting platform according to the analysis and judgment of the pressure sensing signals, and give an early warning prompt in time when the load on the lifting platform is overloaded.

[0032] To ensure that when a load is borne on the top plate 40, the arch plate 50 can move relative to the sunk groove 31 and can elastically deform reliably / smoothly, the left end face and the right end face of the arch plate 50 can be formed into curved surfaces, such as semi-cylindrical curved surfaces, and the curved surfaces are in tangential contact with the inner wall of the left end side or the inner wall of the right end side of the sunk groove 31.

[0033] The arch plate 50 can include a plurality of arched strips, and the plurality of arched strips are distributed at intervals in the front-rear direction. The left end and the right end of the arched strip respectively correspond to and match the left inner wall and the right inner wall of the sunk groove 31.

[0034] A plurality of long strip-shaped through grooves extending in the left-right direction can also be formed on the arch plate 50, and the long strip-shaped through grooves are distributed at intervals in the front-rear direction.

[0035] Such as Figure 3 As shown, bolts or studs are only distributed at the edge positions. To make the top plate 40 and the bottom plate 30 press the arch plate 50 basically evenly on the entire plane, bolts or studs can be distributed and arranged at positions corresponding to the gaps between two adjacent arched strips or at positions corresponding to the long strip-shaped through grooves.

[0036] With the technical solution provided by the present utility model, when the load borne by the lifting platform exceeds the design value or exceeds the warning threshold, a reminder can be given in time, which helps to avoid the lifting platform rising and operating under an overloaded state and remaining in the lifted state for a long time to continuously bear the overloaded load, so as to effectively protect the mechanical components, hydraulic systems and other mechanisms of the lifting platform, prevent adverse situations such as deformation of the mechanical components of the lifting platform, deterioration of strength and rigidity, and prevent the hydraulic system from operating for a long time under the adverse situation of excessive internal pressure, thereby helping to ensure the safety and reliability of the operation of the lifting platform.

[0037] The above embodiments only illustrate the principles and effects of the present utility model by way of example, rather than limiting the present utility model. There are many aspects of the present utility model that can be improved without departing from the overall idea. For those who are familiar with this technology, without departing from the spirit and scope of the present utility model, the above embodiments can be modified or changed. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. An anti-overload mechanism for a lifting platform, characterized in that: It includes a platform outer frame whose lower part is hingedly matched with the upper end of the scissor rod frame, a bottom plate, a top plate, an arch plate and a plurality of gravity sensors; A groove is formed on the upper end surface of the platform outer frame; the bottom plate is placed in the groove and fixed at the bottom of the groove; the top plate is relatively arranged just above the bottom plate, and the arch plate is relatively arranged between the bottom plate and the top plate; A sunken groove is formed on the upper end surface of the bottom plate, and an arc groove is formed in the middle of the lower end surface of the top plate; the left and right ends of the arch plate are respectively close to the left inner wall and the right inner wall of the sunken groove, and the upper protruding curved surface of the arch plate can contact the inner bottom surface of the arc groove; the bottom plate and the top plate are fixedly connected as a whole by bolts or studs, and a vertical spacing is formed between the opposite surfaces of the bottom plate and the top plate; A groove structure is formed on the bottom plate and studs that match the pressure sensors one by one are distributed on the bottom surface of the groove structure; a screw ring is fixedly provided on the lower part of the pressure sensor and the screw ring is matched with the studs, so that the height position of the detection head at the upper end of the pressure sensor can be adjusted; so that the detection head of the pressure sensor can contact the lower end surface of the top plate.

2. The overload protection mechanism of the lifting platform according to claim 1 is characterized in that: The left end surface and the right end surface of the arch plate are both formed as curved surfaces.

3. The overload protection mechanism of the lifting platform according to claim 1 is characterized in that: The arch plate includes a plurality of arch strips which are alternately distributed in the front-rear direction; the left end and the right end of the arch strips respectively correspond to the left inner wall and the right inner wall of the sink.

4. The overload protection mechanism of the lifting platform according to claim 1 is characterized in that: A plurality of long strip through grooves extending in the left-right direction are formed on the arch plate, and the long strip through grooves are alternately distributed in the front-back direction.

5. The overload protection mechanism of the lifting platform according to claim 1 is characterized in that: The groove structure is a side groove formed at the edge of the upper end surface of the bottom plate, and the studs are arranged on the bottom surface of the side groove and are distributed alternately around a circle.

6. The overload protection mechanism of the lifting platform according to any one of claims 1 to 5, characterized in that: A plurality of grooves are arranged on the side wall of the platform outer frame and are connected with the profile groove; the grooves can correspond to the screw rings arranged at the bottom of each pressure sensor respectively to adjust the height position of the pressure sensor.

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