Abnormal descending detection system for aerial work platform and aerial work platform

Abstract

The utility model discloses an abnormal descending detection system for an aerial work platform and the aerial work platform, the abnormal descending detection system comprises a weighing device, a pressure detection device, an abnormal descending alarm device and a control device, the weighing device is used for detecting the load weight on the working platform; the pressure detection device is used for detecting the oil pressure of the telescopic oil cylinder, the abnormal descending alarm device is used for giving an abnormal descending prompt, and the control device is in communication connection with the weighing device, the pressure detection device and the abnormal descending alarm device. And the abnormal descending alarm device can be controlled according to the detection results of the weighing device and the pressure detection device, so that only if the detection result of the weighing device is abnormally reduced, the situation is determined to be the abnormal descending situation and the alarm prompt is controlled to be carried out under the condition that the detection result of the weighing device is kept unchanged and the detection result of the pressure detection device is abnormally reduced. Therefore, the false alarm phenomenon can be avoided, and the purpose of improving the reliability of alarm prompt is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of aerial work platforms, and in particular relates to an abnormal descent detection system for an aerial work platform and the aerial work platform. Background Art

[0002] Mast-type aerial work platform is a special equipment for aerial work with a wide range of uses. It can be used for indoor and outdoor machinery installation, equipment repair, building maintenance, cargo storage, etc. in stations, docks, bridges, halls and factories.

[0003] As equipment that carries personnel during construction, its safety is paramount. Whether the platform is lowering or maintaining a certain height, any abnormal descent requires real-time detection and alarms to alert operators. This helps prevent accidents by prompting maintenance. Currently, mast-type aerial work platforms only detect abnormal descent based on the pressure sensor on the telescopic cylinder, which can easily lead to false alarms. Utility Model Content

[0004] In response to the above-mentioned defects or shortcomings, the present invention provides an abnormal descent detection system for an aerial work platform and an aerial work platform, aiming to solve the technical problem of easily generating false alarms by judging whether the work platform has abnormally descended only based on the detection results of the pressure sensor on the telescopic cylinder.

[0005] To achieve the above-mentioned purpose, the first aspect of the present invention provides an abnormal descent detection system for an aerial work platform, wherein the abnormal descent detection system for an aerial work platform includes a weighing device, a pressure detection device, an abnormal descent alarm device and a control device; the weighing device is arranged at the connection between the working platform and the lifting arm device and is used to detect the load weight on the working platform; the pressure detection device is arranged on the telescopic cylinder that can drive the lifting arm device to be extended and retracted and is used to detect the oil pressure of the telescopic cylinder; the abnormal descent alarm device is used to issue an abnormal descent prompt; the control device is communicatively connected to the weighing device, the pressure detection device and the abnormal descent alarm device respectively, and is used to control the abnormal descent alarm device according to the detection results of the weighing device and the pressure detection device.

[0006] In one embodiment of the present invention, the abnormal descent detection system also includes a storage position detection device that is communicatively connected to the control device. The storage position detection device is arranged on the chassis and is used to respond when the lifting arm device is retracted to the storage position. The control device is used to control the abnormal descent alarm device according to the detection results of the storage position detection device, the weighing device and the pressure detection device.

[0007] In one embodiment of the present invention, a mounting side panel is provided on the chassis, and the mounting side panel is used to laterally enclose a storage space for the lifting arm device to be installed. The storage position detection device includes a rocker-type position detection switch. The main body of the position detection switch is provided on the side of the mounting side panel away from the storage space, and an installation opening is provided on the mounting side panel for the rocker portion of the position detection switch to extend toward the storage space. The lifting arm device is provided with a trigger block for abutting against the rocker portion.

[0008] In one embodiment of the present invention, the mounting opening is arranged on one side of the lifting arm device, the rocker arm portion includes a rocker arm mounting shaft provided on the main body and extending from the mounting opening to the storage space, and a rocker arm body rotatably sleeved on the rocker arm mounting shaft, the trigger block is provided on the side of the lifting arm device facing the mounting opening, and is formed with an abutment surface that abuts against the side of the rocker arm body, the abutment surface includes a chamfered inclined surface and a vertical plane arranged in sequence from bottom to top, the chamfered inclined surface can press down the rocker arm body so that the vertical plane can press against the rocker arm body laterally when the lifting arm device is in the storage position.

[0009] In one embodiment of the present invention, a first connecting part and a second connecting part are provided on the working platform and the lifting arm device in a one-to-one correspondence, and the weighing device includes a pin shaft weighing sensor that is communicatively connected to the control device, and the pin shaft weighing sensor is connected in series with the first connecting part and the second connecting part.

[0010] In one embodiment of the present invention, a first cross bar and a second cross bar are provided on the side of the protective fence of the working platform close to the lifting arm device, and the first cross bar and the second cross bar are arranged horizontally in sequence from bottom to top. The first connecting part includes two first connecting ear plates standing between the first cross bar and the second cross bar and arranged relatively spaced apart, the lower ends of the two first connecting ear plates are respectively connected to the first cross bar, and the upper ends are respectively connected to the second cross bar, and the second connecting part includes a second connecting ear plate extending laterally from the lifting arm device, and the second connecting ear plate can be extended between the two first connecting ear plates and connected in series through a pin shaft weighing sensor.

[0011] In one embodiment of the present invention, the first connecting ear plate and the second connecting ear plate are respectively provided with a first connecting hole and a second connecting hole in one-to-one correspondence, the pin shaft weighing sensor is passed through the first connecting hole and the second connecting hole, and a clearance opening is provided at the upper end or the lower end of the second connecting ear plate, and the clearance opening is used to accommodate the corresponding cross bar when the first connecting hole and the second connecting hole are aligned.

[0012] In one embodiment of the present invention, a contact block is further provided on the lifting arm device. The contact block is located on the lower side of the second connecting portion and is provided with a nylon contact layer on the side facing the working platform. The nylon contact layer is used to make lateral contact with the base frame of the working platform.

[0013] In one embodiment of the present invention, the pressure detection device includes a pressure sensor provided on a descending valve block of the telescopic oil cylinder.

[0014] To achieve the above-mentioned object, a second aspect of the present invention provides an aerial work platform, wherein the aerial work platform includes the abnormal descent detection system for the aerial work platform described above.

[0015] Through the above technical solution, the abnormal descent detection system for aerial work platforms provided by the embodiment of the present utility model has the following beneficial effects:

[0016] When the aerial work platform uses the above-mentioned abnormal descent detection system, a weighing device is added, and the control device can control the abnormal descent alarm device according to the detection results of the weighing device and the pressure detection device, so that only when the detection result of the weighing device remains unchanged, if the detection result of the pressure detection device decreases abnormally, it is determined to be an abnormal descent and the abnormal descent alarm device is controlled to issue an alarm prompt. If the detection results of the weighing device and the pressure detection device both decrease, it is considered that the decrease in the detection result of the pressure detection device is caused by the position change of objects and personnel on the work platform, thereby avoiding false alarms and achieving the purpose of improving the reliability of the alarm prompt.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the drawings:

[0019] Figure 1 This is a control principle diagram of an abnormal drop detection system according to one embodiment of the present utility model;

[0020] Figure 2 This is a structural diagram of an aerial work platform according to one embodiment of the present utility model;

[0021] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 4 It is a structural diagram of a working platform according to one embodiment of the present utility model;

[0023] Figure 5It is a partial structural diagram of a lifting arm device according to one embodiment of the utility model;

[0024] Figure 6 This is a partial structural diagram of an aerial work platform according to one embodiment of the present utility model;

[0025] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure at B in the middle;

[0026] Figure 8 It is another partial structural schematic diagram of the lifting arm device according to one embodiment of the utility model;

[0027] Figure 9 This is a schematic structural diagram of a storage position detection device and a trigger block according to an embodiment of the present utility model;

[0028] Figure 10 It is a structural diagram of a trigger block according to an embodiment of the present utility model.

[0029] Description of Reference Numerals

[0030] 100 Lifting arm device 130 Trigger block

[0031] 131 abutting surface 132 chamfered surface

[0032] 133 vertical plane 140 second connecting portion

[0033] 141 clearance opening 142 second connection hole

[0034] 150 contact block 400 working platform

[0035] 410 First connection portion 420 Protective fence

[0036] 421 first crossbar 422 second crossbar

[0037] 430 base frame

[0038] 500 Weighing device 600 Storage position detection device

[0039] 610 Main body 620 Rocker

[0040] 621 first mounting plate portion 622 connecting plate portion

[0041] 623 Second mounting plate 624 Wheel body

[0042] 700 chassis 710 installation side panels

[0043] 711 Mounting opening DETAILED DESCRIPTION

[0044] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0045] The abnormal descent detection system for an aerial work platform and the aerial work platform of the present invention will be described below with reference to the accompanying drawings.

[0046] like Figures 1 to 3 As shown, the utility model provides an abnormal descent detection system for an aerial work platform, wherein the abnormal descent detection system for an aerial work platform includes:

[0047] The weighing device 500 is provided at the connection between the working platform 400 and the lifting arm device 100 and is used to detect the weight of the load on the working platform 400;

[0048] A pressure detection device is provided on the telescopic oil cylinder that can drive the lifting arm device 100 to extend and retract, and is used to detect the oil pressure of the telescopic oil cylinder;

[0049] Abnormal descent alarm device, used to issue abnormal descent prompts;

[0050] The control device is respectively connected to the weighing device 500, the pressure detection device and the abnormal descent alarm device for communication, and is used to control the abnormal descent alarm device according to the detection results of the weighing device 500 and the pressure detection device.

[0051] When the aerial work platform uses the above-mentioned abnormal descent detection system, a weighing device 500 is added, and the control device can control the abnormal descent alarm device according to the detection results of the weighing device 500 and the pressure detection device, so that only when the detection result of the weighing device 500 remains unchanged, if the detection result of the pressure detection device shows an abnormal decrease, it is determined to be an abnormal descent situation and the abnormal descent alarm device is controlled to issue an alarm prompt. If the detection results of the weighing device 500 and the pressure detection device both decrease, it is considered that the decrease in the detection result of the pressure detection device is caused by the position change of objects and personnel on the working platform 400, thereby avoiding false alarms and achieving the purpose of improving the reliability of the alarm prompt.

[0052] Specifically, the abnormal descent alarm device can be a roarer, an audible and visual alarm, a three-color LED alarm, or a device that displays an alarm on a screen. It should be noted that the communication connection mentioned in the present invention can be either a wired connection or a wireless connection.

[0053] See also Figure 1 、 Figure 6 and Figure 7 In one embodiment of the present invention, the abnormal descent detection system further includes a stowed position detection device 600 communicatively connected to the control device. The stowed position detection device 600 is mounted on the chassis 700 and is configured to respond when the lift arm assembly 100 retracts to the stowed position. The control device is configured to control the abnormal descent alarm device based on the detection results of the stowed position detection device 600, the weighing device 500, and the pressure detection device. Incorporating the stowed position detection device 600 into the abnormal descent detection system ensures that abnormal descent detection occurs only during the operation of the lift arm assembly 100, avoiding unnecessary calculations. Furthermore, the stowed position detection device 600 can detect whether the lifting arm assembly 100 has retracted to the stowed position. When the lifting arm assembly 100 retracts to the point where the stowed position detection device 600 is triggered, it can be determined that the lifting arm assembly 100 has retracted to the stowed position. Conversely, when the lifting arm assembly 100 does not trigger the stowed position detection device 600, it can be determined that the lifting arm assembly 100 has left the stowed position and is in the process of lifting the work platform 400. In other words, the control device only obtains the detection results of the weighing device 500 and the pressure detection device when the stowed position detection device 600 is not triggered. Utilizing the existing stowed position detection device 600, rather than adding a separate device to detect the operating status of the lifting arm assembly 100, can reduce production costs.

[0054] In one embodiment of the present invention, a mounting side panel 710 is provided on the chassis 700. The mounting side panel 710 is used to laterally enclose a storage space for the lifting arm assembly 100. The storage position detection device 600 includes a rocker-type position detection switch. The main body 610 of the position detection switch is located on the side of the mounting side panel 710 facing away from the storage space. The mounting side panel 710 also defines a mounting opening 711 for the rocker portion 620 of the position detection switch to extend into the storage space. The lifting arm assembly 100 is provided with a trigger block 130 for abutting the rocker portion 620. By locating the main body 610 of the position detection switch on the side of the mounting side panel 710 facing away from the storage space, it provides a certain degree of protection while allowing the position detection switch to be installed and removed from the outside of the storage space. Compared to a narrow storage space, installing and removing the position detection switch from the outside is significantly more convenient. Specifically, the mounting opening 711 is defined at the upper end of the mounting side panel 710. Of course, the present invention is not limited thereto, and the storage position detection device 600 may also be a suitable detection device such as a photoelectric position detector.

[0055] See also Figures 6 to 10In one embodiment of the present invention, the mounting opening 711 is arranged biased to one side of the lifting arm device 100. In order to enable the rocker arm portion 620 of the position detection switch to extend from the mounting opening 711 to the storage space, the main body 610 of the position detection switch should be arranged at a position corresponding to the mounting opening 711, that is, the main body 610 is also arranged biased to one side of the lifting arm device 100, thereby facilitating the subsequent lateral abutment arrangement between the rocker arm portion 620 and the trigger block 130. The rocker arm portion 620 includes a rocker arm mounting shaft provided on the main body 610 and extending in a direction from the mounting opening 711 toward the storage space, and a rocker arm body rotatably sleeved on the rocker arm mounting shaft. The trigger block 130 is provided on the lifting arm device 100 toward the mounting opening 711. A contact surface 131 is formed on one side of the arm assembly, and is laterally abutted against the arm assembly. Specifically, the contact surface 131 is disposed toward a side of the arm assembly. The contact surface 131 includes a chamfered surface 132 and a vertical plane 133, arranged sequentially from bottom to top. During the retraction and descent of the arm assembly 100, the chamfered surface 132 first presses down on the arm assembly, causing the arm assembly to swing downward at a certain angle to an inclined position. As the arm assembly 100 continues to retract, the vertical plane 133 switches to continue abutting against the wheel 624 on the arm assembly. Because the arm assembly 100 is tilted, the vertical plane 133 continues to apply pressure to the arm assembly, allowing the vertical plane 133 to laterally abut against the arm assembly when the arm assembly 100 is in the stowed position. The addition of the chamfered surface 132 facilitates the smooth guidance of the arm assembly until it laterally abuts against the arm assembly.

[0056] Furthermore, the rocker arm body includes a first mounting plate portion 621, a connecting plate portion 622 and a second mounting plate portion 623 which are arranged in sequence from the rocker arm mounting axis toward the abutment surface 131, and the first mounting plate portion 621 is rotatably mounted on the rocker arm mounting axis, the connecting plate portion 622 is bent from the first mounting plate portion 621 toward a direction away from the main body portion 610, and the second mounting plate portion 623 is bent from one end of the connecting plate portion 622 away from the first mounting plate portion 621 toward a side away from the first mounting plate portion 621, and a wheel body 624 is provided on the second mounting plate portion 623.

[0057] like Figure 2 and Figure 3As shown, in one embodiment of the present invention, a first connecting portion 410 and a second connecting portion 140 are provided on the work platform 400 and the lifting arm assembly 100 in a one-to-one correspondence. The weighing device 500 includes a pin-shaped load cell in communication with the control device. The pin-shaped load cell is connected in series with the first connecting portion 410 and the second connecting portion 140. The pin-shaped load cell connected in series with the first connecting portion 410 and the second connecting portion 140 not only achieves the connection between the work platform 400 and the lifting arm assembly 100, but also enables the detection of the load weight on the work platform 400, achieving two goals at one stroke. Specifically, the second connecting part 140 is arranged on the outermost telescopic section arm of the lifting arm device 100, and the number of the first connecting part 410, the second connecting part 140 and the pin shaft weighing sensor are all two. The two second connecting parts 140 are arranged in sequence along the width direction of the outermost telescopic section arm. The two first connecting parts 410 are respectively arranged in one-to-one correspondence with the two second connecting parts 140 on one side of the working platform 400, and the two pin shaft weighing sensors are connected in series one-to-one with the corresponding first connecting parts 410 and the second connecting parts 140.

[0058] See also Figures 2 to 4 In one embodiment of the present invention, a first cross bar 421 and a second cross bar 422 are provided on the side of the protective fence 420 of the working platform 400 close to the lifting arm device 100. The first cross bar 421 and the second cross bar 422 are arranged horizontally in sequence from bottom to top. The first connecting part 410 includes two first connecting ear plates standing between the first cross bar 421 and the second cross bar 422 and arranged relatively spaced apart. The lower ends of the two first connecting ear plates are respectively connected to the first cross bar 421, and the upper ends are respectively connected to the second cross bar 422. The second connecting part 140 includes a second connecting ear plate extending laterally from the lifting arm device 100. The second connecting ear plate can be extended between the two first connecting ear plates and connected in series through a pin shaft weighing sensor. The first connecting portion 410 is configured to include two first connecting lugs, each with a crossbar at its upper and lower ends. This provides a more stable connection between the first connecting portion 410 and the second connecting portion 140. The two crossbars also serve as stops for the second connecting lug as it extends between the two first connecting lugs and performs hole alignment adjustments. Specifically, the pin-type load cell is also fitted with two nylon clamping pads, one located between the first connecting lugs and the second leveling lug.

[0059] See also Figures 2 to 5In one embodiment of the present invention, the first and second connecting lugs are formed with corresponding first and second connecting holes 142, respectively. The pin-shaped load cells are inserted through the first and second connecting holes 142. A clearance opening 141 is formed at the upper or lower end of the second connecting lug. The clearance opening 141 is used to accommodate the corresponding crossbar when the first and second connecting holes 142 are aligned. The provision of the clearance opening 141 facilitates alignment of the first and second connecting holes 142. Specifically, to align the first and second connecting holes 142, the clearance opening 141 is first aligned with the corresponding crossbar, then the clearance opening 141 is moved to position the corresponding crossbar within the clearance opening 141. Finally, fine-tuning is performed to achieve alignment of the first and second connecting holes 142. It should be noted that after the work platform 400 is connected to the lifting arm assembly 100, the clearance opening 141 does not exert any support force on the work platform 400, i.e., a gap remains between the clearance opening 141 and the corresponding crossbar. Preferably, the clearance opening 141 is opened at the upper end of the second connecting ear plate and can accommodate the second cross bar 422 , and the second connecting hole 142 is located directly below the clearance opening 141 , and the first connecting hole is located directly below the second cross bar 422 .

[0060] In one embodiment of the present invention, the lifting arm assembly 100 is further provided with a contact block 150. Specifically, the contact block 150 is disposed on the outermost telescopic arm. The contact block 150 is located below the second connecting portion 140 and has a nylon contact layer on the side facing the work platform 400. The nylon contact layer is configured to make lateral contact with the base frame 430 of the work platform 400. The addition of the contact block 150 prevents friction between the base frame 430 of the work platform 400 and the lifting arm assembly 100. The addition of the nylon contact layer also ensures smooth contact between the contact block 150 and the base frame 430. The contact block 150 does not provide support for the work platform 400, thereby ensuring the accuracy of the weighing device 500. Specifically, there are two contact blocks 150, spaced apart along the width of the side of the lifting arm assembly 100 facing the work platform 400.

[0061] In one embodiment of the present invention, the pressure detection device includes a pressure sensor mounted on the telescopic cylinder's descending valve block. Specifically, by using the pressure detection device as the existing pressure sensor on the telescopic cylinder's descending valve block, additional components are not required, thereby reducing production costs.

[0062] Furthermore, the present invention provides an aerial work platform, wherein the aerial work platform includes the above-described abnormal descent detection system for an aerial work platform. Because the aerial work platform utilizes all of the technical solutions of the aforementioned embodiments, it possesses at least all of the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and a detailed description thereof will not be repeated here. The aerial work platform may specifically be a mast-type aerial work platform.

[0063] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0064] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0066] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An abnormal descent detection system for an aerial work platform, characterized in that: The abnormal descent detection system includes: A weighing device (500) is provided at the connection between the working platform (400) and the lifting arm device (100) and is used to detect the weight of the load on the working platform (400); A pressure detection device is provided on a telescopic oil cylinder capable of driving the lifting arm device (100) to extend and retract, and is used to detect the oil pressure of the telescopic oil cylinder; Abnormal descent alarm device, used to issue abnormal descent prompts; A control device is respectively connected to the weighing device (500), the pressure detection device and the abnormal descent alarm device for communication, and is used to control the abnormal descent alarm device according to the detection results of the weighing device (500) and the pressure detection device.

2. The abnormal descent detection system for aerial work platforms according to claim 1, characterized in that: The abnormal descent detection system further comprises a storage position detection device (600) communicatively connected to the control device, wherein the storage position detection device (600) is arranged on the chassis (700) and is used to respond when the lifting arm device (100) is retracted to the storage position, and the control device is used to control the abnormal descent alarm device according to the detection results of the storage position detection device (600), the weighing device (500) and the pressure detection device.

3. The abnormal descent detection system for aerial work platforms according to claim 2, characterized in that: The chassis (700) is provided with a mounting side plate (710), and the mounting side plate (710) is used to laterally enclose a storage space for the lifting arm device (100). The storage position detection device (600) includes a rocker-type position detection switch, and the main body (610) of the position detection switch is provided on the side of the mounting side plate (710) away from the storage space. The mounting side plate (710) is provided with a mounting opening (711) for the rocker portion (620) of the position detection switch to extend toward the storage space. The lifting arm device (100) is provided with a trigger block (130) for abutting against the rocker portion (620).

4. The abnormal descent detection system for aerial work platforms according to claim 3, characterized in that: The mounting opening (711) is arranged on one side of the lifting arm device (100), and the rocker portion (620) includes a rocker mounting shaft provided on the main body (610) and extending from the mounting opening (711) to the storage space, and a rocker body rotatably sleeved on the rocker mounting shaft. The trigger block (130) is provided on the side of the lifting arm device (100) facing the mounting opening (711), and is formed with an abutting surface (131) abutting against the rocker body in a lateral direction. The abutting surface (131) includes a chamfered inclined surface (132) and a vertical plane (133) arranged in sequence from bottom to top. The chamfered inclined surface (132) can press down the rocker body so that the vertical plane (133) can abut against the rocker body in a lateral direction when the lifting arm device (100) is in the storage position.

5. The abnormal descent detection system for aerial work platforms according to claim 1, characterized in that: The working platform (400) and the lifting arm device (100) are provided with a first connecting portion (410) and a second connecting portion (140) in a one-to-one correspondence, and the weighing device (500) includes a pin shaft weighing sensor that is communicatively connected to the control device, and the pin shaft weighing sensor is connected in series with the first connecting portion (410) and the second connecting portion (140).

6. The abnormal descent detection system for aerial work platforms according to claim 5, characterized in that: A first cross bar (421) and a second cross bar (422) are provided on a side of the protective fence (420) of the working platform (400) close to the lifting arm device (100), and the first cross bar (421) and the second cross bar (422) are arranged horizontally in sequence from bottom to top. The first connecting portion (410) includes two first connecting ear plates standing between the first cross bar (421) and the second cross bar (422) and arranged relatively spaced apart, the lower ends of the two first connecting ear plates are respectively connected to the first cross bar (421), and the upper ends are respectively connected to the second cross bar (422), and the second connecting portion (140) includes a second connecting ear plate extending laterally from the lifting arm device (100), and the second connecting ear plate can extend between the two first connecting ear plates and be connected in series through the pin shaft weighing sensor.

7. The abnormal descent detection system for aerial work platforms according to claim 6, characterized in that: The first connecting ear plate and the second connecting ear plate are respectively provided with a first connecting hole and a second connecting hole (142) in a one-to-one correspondence, the pin shaft weighing sensor is passed through the first connecting hole and the second connecting hole (142), and a clearance opening (141) is provided at the upper end or the lower end of the second connecting ear plate, and the clearance opening (141) is used to accommodate the corresponding cross bar when the first connecting hole and the second connecting hole (142) are aligned.

8. The abnormal descent detection system for aerial work platforms according to claim 5, characterized in that: The lifting arm device (100) is further provided with a contact block (150), the contact block (150) being located on the lower side of the second connecting portion (140) and provided with a nylon contact layer on the side facing the working platform (400), the nylon contact layer being used for lateral contact with the base frame (430) of the working platform (400).

9. The abnormal descent detection system for an aerial work platform according to any one of claims 1 to 8, characterized in that: The pressure detection device includes a pressure sensor provided on the descending valve block of the telescopic oil cylinder.

10. An aerial work platform, characterized in that: The aerial work platform includes the abnormal descent detection system for an aerial work platform according to any one of claims 1 to 9.

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