Mast type aerial work platform

Abstract

The invention discloses a mast type aerial work platform which comprises a chassis device, a lifting arm device, a platform body and a storage position detection device, a storage space is defined on the chassis device, and the lower end of a basic section arm of the lifting arm device is arranged in the storage space; telescopic knuckle arms of the lifting arm device are arranged on the outer side of a basic knuckle arm in a liftable mode, trigger blocks are arranged on the peripheral side of the telescopic knuckle arm on the outermost side, the platform body is arranged on the telescopic knuckle arm on the outermost side, and the storage position detection device is arranged in the side direction of the storage space corresponding to the trigger blocks and can be triggered under the lateral abutting action of the trigger blocks. In other words, the trigger acting force of the collection position detection device is set to be lateral, and compared with downward trigger acting force, the probability of damage phenomena can be obviously reduced, and the purpose of prolonging the service life is achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of aerial machinery, and in particular, relates to a mast-type aerial work platform. Background Art

[0002] Mast-type aerial work platforms are widely used special equipment for aerial work, which can be used for indoor and outdoor mechanical installation, equipment maintenance, building maintenance, cargo storage, etc. in stations, docks, bridges, halls and factories. The mast-type aerial work platform includes a chassis, a detachable mast lifting arm and a platform body. At present, in order to detect the movement of the mast lifting arm, a position detection switch is generally set in the stowed position. If the position detection switch is triggered, it proves that the mast lifting arm has been lowered into place. However, the existing position detection switch is triggered by the trigger member on the mast lifting arm exerting a downward force on it. The triggering force is in the same direction as gravity, and the position detection switch is easily damaged due to excessive force. Summary of the invention

[0003] In view of the above-mentioned defects or shortcomings, the present application provides a mast-type aerial work platform, which aims to solve the technical problem that the position detection switch located in the stowed position is easily damaged due to the use of a downward triggering force.

[0004] To achieve the above-mentioned purpose, the present application provides a mast-type aerial work platform, wherein the mast-type aerial work platform includes a chassis device, a lifting arm device, a platform body and a storage position detection device; a storage space is enclosed on the chassis device; the lower end of the basic section arm of the lifting arm device is arranged in the storage space, the telescopic section arm of the lifting arm device can be raised and lowered on the outside of the basic section arm, and a trigger block is provided on the surrounding side of the outermost telescopic section arm; the platform body is arranged on the outermost telescopic section arm; the storage position detection device is arranged on the side of the storage space corresponding to the trigger block and can be triggered under the lateral abutment of the trigger block.

[0005] In one embodiment of the present application, the mast-type aerial work platform further includes a hydraulic drive system, a weighing device, a pressure detection device, an abnormal lifting alarm device and a control device. The hydraulic drive system can drive the telescopic boom to lift and lower. The weighing device is used to detect the weight of the platform body. The pressure detection device is used to detect the oil pressure of the telescopic cylinder in the hydraulic drive system. The control device is respectively connected to the weighing device, the pressure detection device and the abnormal lifting alarm device and is configured as follows:

[0006] When it is determined that the platform body is in a lifting stop state, obtaining a first pressure value detected by a pressure detection device and a first weight value detected by a weighing device;

[0007] After a first preset time interval, obtaining a second pressure value detected by the pressure detection device and a second weight value detected by the weighing device;

[0008] When the deviation between the first pressure value and the second pressure value is greater than the preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than the preset weight deviation threshold, it is determined that the platform body is in an abnormal lifting state and the abnormal lifting alarm device is controlled to give an abnormal lifting prompt.

[0009] In one embodiment of the present application, the abnormal lifting state includes an abnormal descending state and an abnormal ascending state; when the deviation between the first pressure value and the second pressure value is greater than a preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than a preset weight deviation threshold, it is determined that the platform body is in an abnormal lifting state and the abnormal lifting alarm device is controlled to give an abnormal lifting prompt, including:

[0010] When the first pressure value is greater than the second pressure value and the deviation between the first pressure value and the second pressure value is greater than a preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than a preset weight deviation threshold, it is determined that the platform body is in an abnormal descent state and the abnormal lifting alarm device is controlled to give an abnormal descent prompt; or

[0011] When the first pressure value is less than the second pressure value and the deviation between the first pressure value and the second pressure value is greater than the preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than the preset weight deviation threshold, it is determined that the platform body is in an abnormal ascent state and the abnormal lifting alarm device is controlled to give an abnormal ascent prompt.

[0012] In one embodiment of the present application, determining that the platform body is in a lifting stop state includes:

[0013] In the case where no trigger signal from the storage position detection device is received, determining that the platform body is in a lifting state;

[0014] When no lifting signal instruction is received for a second preset time period, it is determined that the platform body is in a lifting stop state.

[0015] In one embodiment of the present application, the control device is further configured to:

[0016] Obtaining a third weight value detected by the weighing device;

[0017] Determining that the third weight value is less than a preset reverse force judgment weight threshold, wherein the preset reverse force judgment weight threshold is less than a predetermined no-load weight value of the platform body, and the no-load weight value is a weight value of the platform body when it is in an no-load lifting state and there is no interference under the platform body;

[0018] Make sure there are interferences under the platform body and restrict the movement of the mast aerial work platform.

[0019] In one embodiment of the present application, after obtaining the third weight value detected by the weighing device, the method further includes:

[0020] In the case where the third weight value is greater than the empty weight value, determining a weight difference between the third weight value and the empty weight value;

[0021] Determine the ratio of the weight difference to the preset maximum load-bearing weight of the platform body to obtain the load factor;

[0022] When the load rate is greater than a preset load rate threshold, the platform is determined to be overloaded and the movement of the mast-type aerial work platform is restricted.

[0023] In one embodiment of the present application, the control device is further configured to:

[0024] When the third weight value is greater than or equal to the preset reverse force judgment weight threshold, and / or the load rate is less than or equal to the preset load rate threshold, it is determined that the platform body is in a normal working state and the movement of the mast-type aerial work platform is not restricted.

[0025] In one embodiment of the present application, a storage space is formed on the chassis device by installing side panels to laterally enclose the storage space. The storage position detection device includes a rocker-type position detection switch. The main body of the position detection switch is arranged on the side of the installation side panel facing away from the storage space. The installation side panel is provided with an installation opening for the rocker portion of the position detection switch to extend toward the storage space, and the trigger block can abut against the rocker portion.

[0026] In one embodiment of the present application, the mounting opening is arranged on one side of the lifting arm device, the rocker arm portion includes a rocker arm mounting shaft which is arranged on the main body and extends from the mounting opening to the storage space, and a rocker arm body which is rotatably mounted on the rocker arm mounting shaft, the trigger block is arranged on the side of the outermost telescopic section arm facing the mounting opening, and is formed with an abutment surface which abuts against the side of the rocker arm body, the abutment surface includes a chamfered surface and a vertical plane which are arranged in sequence from bottom to top, the chamfered surface can press down the rocker arm body and guide the rocker arm body to the vertical plane, so that the vertical plane can laterally press against the rocker arm body when the outermost telescopic section arm is lowered to the storage position.

[0027] In one embodiment of the present application, a first connection portion and a second connection portion are provided on the platform body and the outermost telescopic arm in one-to-one correspondence, the weighing device includes a pin shaft weighing sensor which is communicatively connected to the control device, the pin shaft weighing sensor is connected in series with the first connection portion and the second connection portion, and a contact block is also provided on the outermost telescopic arm, the contact block is located on the lower side of the second connection portion and is provided with a nylon contact layer on the side facing the platform body, the nylon contact layer is used for lateral contact with the base frame of the platform body.

[0028] In one embodiment of the present application, the number of telescopic joint arms is at least two, and at least two telescopic joint arms are sequentially nested on the outside of the basic joint arm, and the telescopic joint arms located on the inner side are respectively provided with a first tensioning wheel and a second tensioning wheel at the upper and lower ends, and the mast-type aerial work platform also includes:

[0029] The traction device comprises an extending traction member and a retracting traction member, wherein the extending traction member is wound around the first tensioning wheel and the two ends are respectively connected to the joint arms on the adjacent two sides, and the retracting traction member is wound around the second tensioning wheel and the two ends are respectively connected to the joint arms on the adjacent two sides;

[0030] The hydraulic drive system includes a telescopic cylinder which is arranged on the basic boom and is drivingly connected to the innermost telescopic boom, and a pressure cut-off valve in the rodless chamber return oil circuit connected to the telescopic cylinder. The pressure cut-off valve is set to be conductive when the oil pressure in the rodless chamber return oil circuit reaches a preset load pressure.

[0031] In one embodiment of the present application, the rodless chamber return oil circuit includes a working oil port connected to the hydraulic reversing valve and an oil circuit behind the reversing valve of the rodless chamber of the telescopic cylinder. The pressure cut-off valve is arranged on the oil circuit behind the reversing valve, and the pressure cut-off valve includes two valve groups arranged in parallel, one of which includes a first one-way valve that conducts in the oil inlet direction of the telescopic cylinder, and the other valve group includes a second one-way valve that conducts in the oil outlet direction of the telescopic cylinder. The second one-way valve is set to conduct when the oil pressure in the oil circuit behind the reversing valve reaches a preset load pressure.

[0032] In one embodiment of the present application, a descending valve group is provided between the rodless chamber of the telescopic oil cylinder and the hydraulic reversing valve, and the reversing valve rear oil circuit includes a descending valve front oil circuit connecting the hydraulic reversing valve and the descending valve group;

[0033] Among them, the pressure cut-off valve is arranged on the oil circuit before the descending valve and is set as a two-way check valve having a first check valve and a second check valve, or the check valve on the oil inlet circuit after the descending valve in the descending valve group is set as the first check valve, and the second check valve is arranged on the oil return circuit after the descending valve in the descending valve group.

[0034] In one embodiment of the present application, the rodless chamber return oil circuit includes a first reversing valve front oil circuit connecting the oil tank and the return oil port of the hydraulic reversing valve, and a pressure cut-off valve is arranged on the first reversing valve front oil circuit, and the pressure cut-off valve is arranged as a third one-way valve or back pressure valve with adjustable opening pressure.

[0035] Through the above technical solution, the mast-type aerial work platform provided by the present application has the following beneficial effects:

[0036] When using the above-mentioned mast-type aerial work platform, since the chassis device is enclosed with a storage space for the lifting arm device to be set, the storage position detection device can be set on the side of the storage space to avoid being exposed, and when the outermost telescopic arm is lowered to the storage space, the trigger block on the outermost telescopic arm and the storage position detection device are laterally abutted, that is, the trigger force of the storage position detection device is set to the side. Compared with the downward trigger force, the probability of damage can be significantly reduced, thereby achieving the purpose of prolonging the service life.

[0037] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0039] Figure 1 This is a control principle diagram of a mast-type aerial work platform according to one embodiment of the present application;

[0040] Figure 2 It is a structural schematic diagram of a mast-type aerial work platform in a stowed state according to an embodiment of the present application;

[0041] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0042] Figure 4 is a schematic diagram of the structure of a platform body according to an embodiment of the present application;

[0043] Figure 5 is a partial structural schematic diagram of a lifting arm device according to an embodiment of the present application;

[0044] Figure 6 It is a partial structural schematic diagram of a mast-type aerial work platform according to one embodiment of the present application;

[0045] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure at B in the middle;

[0046] Figure 8 is another partial structural schematic diagram of a lifting arm device according to an embodiment of the present application;

[0047] Fig. 9is a schematic diagram of the structure of a storage position detection device and a trigger block according to an embodiment of the present application;

[0048] Fig.10 is a schematic diagram of the structure of a trigger block according to an embodiment of the present application;

[0049] Fig.11 It is a structural schematic diagram of a mast-type aerial work platform in a lifting state according to an embodiment of the present application;

[0050] Fig.12 is a schematic structural diagram of a lifting arm device and a traction device according to an embodiment of the present application;

[0051] Fig.13 is a schematic structural diagram of a first connecting assembly on a basic section arm according to an embodiment of the present application;

[0052] Fig.14 is a schematic diagram of the hydraulic principle of the hydraulic drive system according to the first embodiment of the present application;

[0053] Fig.15 is a schematic diagram of the hydraulic principle of the hydraulic drive system according to the second embodiment of the present application;

[0054] Fig.16 is a schematic diagram of the hydraulic principle of the hydraulic drive system according to the third embodiment of the present application;

[0055] Fig.17 It is a control flow diagram of a control device according to an embodiment of the present application.

[0056] Description of reference numerals:

[0057] 100 Lifting arm device 110 Basic section arm

[0058] 120 Telescopic boom 121 First tensioning wheel

[0059] 122 Second tensioning wheel 130 Trigger block

[0060] 131 abutting surface 132 chamfered surface

[0061] 133 vertical plane 140 second connection portion

[0062] 141 clearance opening 142 second connection hole

[0063] 150 Contact block 200 Traction device

[0064] 210 Extend the traction member 220 Retract the traction member

[0065] 230 first connecting component 231 first connecting piece

[0066] 232 second connecting member 233 fixing portion

[0067] 234 swing part 240 second connecting component

[0068] 241 Third connecting member 300 Hydraulic drive system

[0069] 310 Telescopic Cylinder 320 Pressure Stop Valve

[0070] 321 First one-way valve 322 Second one-way valve

[0071] 323 Third check valve 330 Hydraulic reversing valve

[0072] 340 Rear oil circuit of reversing valve 350 Front oil circuit of first reversing valve

[0073] 360 Oil supply assembly 370 Oil circuit before lowering valve

[0074] 380 Downward valve group 381 Downward valve body

[0075] 382 Oil inlet line after the descending valve 383 Oil return line after the descending valve

[0076] 384 Damping 400 Platform

[0077] 410 first connection part 420 protective fence

[0078] 421 first crossbar 422 second crossbar

[0079] 430 Base frame 500 Weighing device

[0080] 600 Storage position detection device 610 Main body

[0081] 620 swing rod portion 621 first mounting plate portion

[0082] 622 connecting plate portion 623 second mounting plate portion

[0083] 624 wheel 700 chassis

[0084] 710 Mounting side panel 711 Mounting opening DETAILED DESCRIPTION

[0085] The specific embodiments of the present application are described in detail below 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 application, and are not used to limit the present application.

[0086] The mast-type aerial work platform of the present application is described below with reference to the accompanying drawings.

[0087] like Figure 1 , Figure 2 , Fig.11 , Figure 6 and Figure 7 As shown, the present application provides a mast-type aerial work platform, wherein the mast-type aerial work platform comprises:

[0088] A chassis device 700, wherein a storage space is enclosed on the chassis device 700;

[0089] A lifting arm device 100, wherein the lower end of a basic section arm 110 of the lifting arm device 100 is arranged in the storage space, a telescopic section arm 120 of the lifting arm device 100 is arranged to be lifted and lowered outside the basic section arm 110, and a trigger block 130 is arranged around the outermost telescopic section arm 120;

[0090] The platform body 400 is disposed on the outermost telescopic arm 120;

[0091] The storage position detection device 600 is disposed at the side of the storage space corresponding to the trigger block 130 and can be triggered under the lateral abutment of the trigger block 130 .

[0092] When the above-mentioned mast-type aerial work platform is used, since a storage space for the lifting arm device 100 is enclosed on the chassis device 700, the storage position detection device 600 can be arranged on the side of the storage space to avoid being exposed, and when the outermost telescopic arm 120 is lowered to the storage space, the trigger block 130 on the outermost telescopic arm 120 is laterally abutted against the storage position detection device 600, that is, the trigger force of the storage position detection device 600 is set to the side. Compared with the downward trigger force, the probability of damage can be significantly reduced, thereby achieving the purpose of prolonging the service life.

[0093] See also Figure 1 , Figure 2 , Fig.11 , Figure 3 , Fig.12 and Fig.17 In one embodiment of the present application, the mast-type aerial work platform further includes a hydraulic drive system 300, a weighing device 500, a pressure detection device, an abnormal lifting alarm device and a control device. The hydraulic drive system 300 can drive the telescopic boom 120 to lift and lower. The weighing device 500 is used to detect the weight of the platform body 400. The pressure detection device is used to detect the oil pressure of the telescopic cylinder 310 in the hydraulic drive system 300. The control device is respectively connected to the weighing device 500, the pressure detection device and the abnormal lifting alarm device and is configured as follows:

[0094] Step S102, when it is determined that the platform body 400 is in a lifting stop state, obtaining a first pressure value detected by the pressure detection device and a first weight value detected by the weighing device 500;

[0095] Step S104, after a first preset time interval, obtaining a second pressure value detected by the pressure detection device and a second weight value detected by the weighing device 500;

[0096] Step S106, when the deviation between the first pressure value and the second pressure value is greater than the preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than the preset weight deviation threshold, it is determined that the platform body 400 is in an abnormal lifting state and the abnormal lifting alarm device is controlled to give an abnormal lifting prompt.

[0097] It can be understood that the hydraulic drive system 300 is used to drive the lifting arm device 100 to drive the platform body 400 to realize the lifting action. The first preset time length is a preset time length, such as 2 seconds or 5 seconds. The first pressure value and the first weight value can be the detection values ​​at the start time point of the first preset time length, and the second pressure value and the second weight value can be the detection values ​​at the end time point of the first preset time length. The preset pressure deviation threshold is the preset pressure deviation threshold of the hydraulic drive system 300. The preset weight deviation threshold is the preset weight deviation threshold of the platform body 400. The abnormal lifting alarm device can be set as a buzzer, an audible and visual alarm, a three-color LED alarm, or a device for displaying an alarm. It should be noted that the communication connection mentioned in this application can be either a wire connection or a wireless connection.

[0098] Specifically, when determining that the platform body 400 is in a lifting stop state, the control device obtains the first pressure value detected by the pressure detection device and the first weight value detected by the weighing device 500. And after a first preset time interval, the control device continues to obtain the second pressure value detected by the pressure detection device and the second weight value detected by the weighing device 500. Then the control device can compare the first pressure value with the second pressure value, and compare the first weight value with the second weight value. When the deviation between the first pressure value and the second pressure value is greater than the preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than the preset weight deviation threshold, the control device can determine that the platform body 400 is in an abnormal lifting state. It can be understood that the deviation between the first pressure value and the second pressure value is greater than the preset pressure deviation threshold, which means that after the platform body 400 stops lifting, the pressure of the hydraulic drive system 300 has changed significantly, and the deviation between the first weight value and the second weight value is less than the preset weight deviation threshold, which means that after the platform body 400 stops lifting, the weight of the platform body 400 has not changed significantly. Combining the two, the pressure of the hydraulic drive system 300 has changed, but the weight of the platform body 400 has not changed significantly, thereby eliminating the influencing factor of the change in the pressure of the hydraulic drive system 300 due to the change in the load of the platform body 400, and it can be determined that the platform body 400 has an abnormal lifting phenomenon, that is, the platform body 400 is in an abnormal lifting state.

[0099] In the above technical scheme, by comparing the pressure value of the hydraulic drive system 300 and the weight value of the platform body 400 at different time points after the platform body 400 stops lifting and lowering, combined with the pressure value change and the weight value change, it is determined whether the platform body 400 is in an abnormal lifting and lowering state. When the pressure value change is greater than the preset pressure deviation threshold and the weight value change is less than the preset weight deviation threshold, it is determined that the platform body 400 is in an abnormal lifting and lowering state. This can achieve rapid and accurate judgment of abnormal results of the aerial work platform, thereby reducing the impact of abnormal conditions on construction operations and further improving the construction safety of the aerial work platform.

[0100] In one embodiment of the present application, the abnormal lifting state includes an abnormal descending state and an abnormal ascending state; when the deviation between the first pressure value and the second pressure value is greater than a preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than a preset weight deviation threshold, it is determined that the platform body 400 is in an abnormal lifting state and the abnormal lifting alarm device is controlled to give an abnormal lifting prompt, including:

[0101] When the first pressure value is greater than the second pressure value and the deviation between the first pressure value and the second pressure value is greater than the preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than the preset weight deviation threshold, it is determined that the platform body 400 is in an abnormal descent state and the abnormal lifting alarm device is controlled to give an abnormal descent prompt; or

[0102] When the first pressure value is less than the second pressure value and the deviation between the first pressure value and the second pressure value is greater than the preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than the preset weight deviation threshold, it is determined that the platform body 400 is in an abnormal ascent state and the abnormal lifting alarm device is controlled to give an abnormal ascent prompt.

[0103] It can be understood that, under normal circumstances, during the descent of the platform body 400, the pressure of the hydraulic drive system 300 tends to decrease, and during the ascent of the platform body 400, the pressure of the hydraulic drive system 300 tends to increase. Therefore, if the first pressure value is greater than the second pressure value and the deviation between the first pressure value and the second pressure value is greater than the preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than the preset weight deviation threshold, the control device can determine that the platform body 400 is in an abnormal descent state; if the first pressure value is less than the second pressure value and the deviation between the first pressure value and the second pressure value is greater than the preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than the preset weight deviation threshold, the control device can determine that the platform body 400 is in an abnormal ascent state.

[0104] In one embodiment of the present application, determining that the platform body 400 is in a lifting stop state includes:

[0105] In the case where no trigger signal is received from the storage position detection device 600, it is determined that the platform body 400 is in the lifting state;

[0106] When no lifting signal instruction is received for a second preset time period, it is determined that the platform body 400 is in a lifting stop state.

[0107] It can be understood that after the control device receives the trigger signal of the stowed position detection device 600, it can be determined that the platform body 400 is in the stowed position. Conversely, when the platform body 400 is lifted from the stowed position, the outermost telescopic arm 120 is driven to rise and leave the trigger area of ​​the stowed position detection device 600, so that the position detection device enters an untriggered state. At this time, the control device does not receive the trigger signal of the stowed position detection device 600, so it can be determined that the platform body 400 enters the lifted state.

[0108] Specifically, when the platform body 400 is located at the stowed position, the stowed position detection device 600 may trigger a signal, and if the control device does not receive the trigger signal of the stowed position detection device 600, it may be determined that the platform body 400 is in a lifting state. In other words, the control device may determine whether the platform body 400 is in a lifting state or a stowed state through the stowed position detection device 600.

[0109] It should be particularly noted that when the platform body 400 is in the stowed position, even if abnormal lifting occurs, there is no safety risk to the operator on the platform. Therefore, it is only necessary to judge the abnormal lifting of the platform body 400 when the platform body 400 is not in the stowed position, thereby avoiding unnecessary waste of resources and improving work efficiency.

[0110] In addition, the platform operating device can be used as a device for operating the platform body 400 to rise and fall, and the operator inputs a lifting signal command to the platform operating device to operate the platform body 400. The second preset time length is a preset waiting time length, such as 3 seconds or 5 seconds.

[0111] Specifically, when the platform body 400 is in the lifting state, if the control device does not receive the lifting signal instruction sent by the platform operating device for a second preset time period, it can be determined that the platform body 400 stops the lifting action and enters the lifting stop state.

[0112] In one example, the pressure detection device can be set as a pressure sensor on the hydraulic valve block of the telescopic oil cylinder 310 in the hydraulic drive system 300. When the platform body 400 is lifted to a certain position and stops, the pressure of the hydraulic drive system 300 will be locked to a fixed value when the load on the platform body 400 remains unchanged. When the platform body 400 is stationary, if the telescopic oil cylinder 310 has internal leakage, the valve core is stuck, or the descending valve signal is abnormally output, etc., it may cause the platform body 400 to descend abnormally.

[0113] Taking the abnormal descent of the platform body 400 as an example, the control method for the abnormal descent of the platform body 400 may specifically include the following steps:

[0114] After the whole machine is powered on, the platform control box (i.e., the platform operating device) is operated to put the platform body 400 in a lifting state. 2s after the platform body 400 stops lifting, the control device of the whole machine (i.e., ECU) records the pressure signal value P1 and the platform load signal value G1 at this time, and compares them with the pressure value and platform load value 2s later. The pressure value and platform load value continuously received after 2s are set as P2 and G2, respectively. When it is detected that the pressure value decreases by more than ΔP and the platform body load value does not decrease by more than ΔG, the control device of the whole machine outputs a signal control to alarm. After the alarm, the control device of the whole machine can limit other operations, only descending, or limit all actions, that is, the alarm condition can be: P1-P2>ΔP and G1-G2<ΔG.

[0115] ΔP and ΔG are thresholds preset in advance in the control device of the whole machine. These two thresholds are obtained based on the actual working condition test of the whole machine and can be adjusted in the control device of the whole machine. The set thresholds are ensured to be reasonable, which can effectively detect the abnormal descent of the platform body 400 and prevent false alarms.

[0116] When the platform body 400 is controlled to perform a lifting or lowering action again, or after power is restored, the above data is automatically cleared, and the pressure signal value P1 and the platform load signal value G1 at the time of stopping are recollected, and the above control logic is re-executed.

[0117] The technical solution provided in the above embodiment can automatically detect whether the platform body 400 has abnormal descent under different working conditions. Whether before or during the use of the equipment, automatic detection can be achieved, and the operator can be reminded to repair the abnormality in time to reduce safety risks.

[0118] In one embodiment of the present application, the control device is further configured to:

[0119] Obtaining a third weight value detected by the weighing device 500;

[0120] Determining that the third weight value is less than a preset reverse force judgment weight threshold, wherein the preset reverse force judgment weight threshold is less than a predetermined no-load weight value of the platform body 400, and the no-load weight value is a weight value of the platform body 400 when it is in an no-load lifting state and there is no interference under the platform body 400;

[0121] It is determined that there is an interference object below the platform body 400 and that the movement of the mast-type aerial work platform is restricted.

[0122] It can be understood that the third weight value is the weight value of the platform body 400 detected by the weighing device 500 in any scenario. The preset reverse force judgment weight threshold is a predetermined weight threshold for judging whether the platform body 400 is subjected to an upward reverse force (i.e., a supporting force) opposite to the direction of gravity, that is, if the weight detection value of the platform body 400 is less than the preset reverse force judgment weight threshold, it can be determined that the platform body 400 is subjected to an upward reverse force opposite to the direction of gravity, which can also indicate that there is an interference under the platform body 400, and the interference generates an upward supporting force on the platform body 400. It can be understood that the preset reverse force judgment weight threshold is less than the predetermined empty weight value of the platform body 400, and the empty weight value is the weight value of the platform body 400 when it is in an empty lifting state and there is no interference under the platform body 400. The empty lifting state is that there is no person or object on the platform body 400, and the platform body 400 is in a lifting state, i.e., a non-collected state, and the empty weight value can be determined in advance. Interference objects may include people or objects that may interfere with the normal operation of the aerial work platform, such as wood blocks.

[0123] Specifically, when the platform body 400 is in an ascending state, a descending state or a stationary state, the control device can communicate with the weighing device 500, so as to obtain the third weight value detected by the weighing device 500 in real time, and compare the third weight value with the preset reverse force judgment weight threshold. When it is determined that the third weight value is less than the preset reverse force judgment weight threshold, the control device can determine that there is an interference under the platform body 400 at this time.

[0124] In the above technical solution, by obtaining the weight detection value of the platform body 400 detected by the weighing device 500, when it is determined that the weight detection value is less than the preset reverse force judgment weight threshold, it can be determined that there is an interference under the platform body 400. There is no need to set up additional interference detection equipment. Only by detecting the weight information detected by the weighing device 500 that detects the weight of the platform body 400, it can be determined whether there is an interference under the platform body 400, which reduces the hardware cost, and restricts the action of the mast-type aerial work platform when it is determined that there is an interference, thereby improving the construction safety of the aerial work platform.

[0125] In one embodiment of the present application, after obtaining the third weight value detected by the weighing device 500, the method further includes:

[0126] In the case where the third weight value is greater than the empty weight value, determining a weight difference between the third weight value and the empty weight value;

[0127] Determine the ratio of the weight difference to the preset maximum load-bearing weight of the platform body 400 to obtain a load factor;

[0128] When the load rate is greater than a preset load rate threshold, it is determined that the platform body 400 is overloaded and the movement of the mast-type aerial work platform is restricted.

[0129] It can be understood that the preset maximum load-bearing weight is the preset maximum load that the platform body 400 can bear. The load rate is the ratio of the weight difference to the preset maximum load-bearing weight. The weight difference is the difference between the third weight value and the empty weight value, that is, the weight of the person and / or object carried on the platform body 400. The preset load rate threshold is a preset load rate threshold for determining that the platform body 400 is overloaded, such as 85% or 90%. If the load rate is greater than the preset load rate threshold, it can be determined that the platform body 400 is overloaded.

[0130] Specifically, the control device may compare the third weight value of the platform body 400 with the predetermined empty weight value of the platform body 400. When it is determined that the third weight value is greater than the empty weight value, the control device may determine the weight difference between the third weight value and the empty weight value, and determine the ratio of the weight difference to the preset maximum load weight of the platform body 400 to obtain the load rate of the platform body 400 at this time. Then, the load rate of the platform body 400 is compared with the preset load rate threshold. When it is determined that the load rate is greater than the preset load rate threshold, the control device may determine that the platform body 400 is overloaded.

[0131] In the above technical solution, when the third weight value is greater than the empty weight value, by determining the load rate of the platform body 400 and judging that the platform body 400 is overloaded when the load rate is greater than the preset load rate threshold, the overload of the platform body 400 can be accurately and quickly judged, thereby further improving the construction safety of the aerial work platform and extending the service life of the aerial work platform.

[0132] In one embodiment of the present application, the control device is further configured to:

[0133] When the third weight value is greater than or equal to the preset reverse force judgment weight threshold, and / or the load rate is less than or equal to the preset load rate threshold, it is determined that the platform body 400 is in a normal working state and the movement of the mast-type aerial work platform is not restricted.

[0134] It can be understood that the normal working state of the platform body 400 may include a working state in which no interference exists below the platform body 400 and / or a working state in which the platform body 400 is not overloaded.

[0135] Specifically, if the weight detection value of the platform body 400 is greater than or equal to the preset reverse force judgment weight threshold, it indicates that there is no interference under the platform body 400. If the load rate of the platform body 400 is less than or equal to the preset load rate threshold, it indicates that the platform body 400 is not overloaded. When at least one of the above two situations occurs, the control device can determine that the platform body 400 is in a normal working state. At this time, the control device may not restrict the movement of the aerial work platform.

[0136] In the above technical solution, when the weight detection value of the platform body 400 is greater than or equal to the preset reverse force judgment weight threshold, and / or the load rate of the platform body 400 is less than or equal to the preset load rate threshold, it indicates that the platform body 400 is in a normal working state, and the control device does not restrict the movement of the aerial work platform, which can further improve the operating efficiency of the aerial work platform.

[0137] In one embodiment of the present application, determining the no-load weight value may include: determining that the weighing device 500 is in a normal working state; when the platform body 400 is in a no-load lifting state and there is no interference under the platform body 400, calibrating the weighing device 500 to obtain the no-load weight value of the platform body 400 detected by the weighing device 500.

[0138] In one embodiment of the present application, determining that the weighing device 500 is in normal working condition may include: determining that the weighing device 500 is in normal working condition when data sent by the weighing device 500 is received within a preset time period and / or at a preset time interval; and / or determining that the weighing device 500 is in normal working condition when no fault message sent by the weighing device 500 is received.

[0139] It can be understood that the preset time period is a preset time period, and the preset duration is a preset time length. The fault message is content information indicating that the weighing device 500 has a fault.

[0140] In one embodiment of the present application, the control device is further configured to: determine that a fault has occurred in the weighing device 500 and restrict the movement of the aerial work platform when no data sent by the weighing device 500 is received within a preset time period and / or at a preset time interval; and / or determine that a fault has occurred in the weighing device 500 and restrict the movement of the aerial work platform when a fault message sent by the weighing device 500 is received, thereby ensuring human-machine safety.

[0141] In one embodiment of the present application, there may be at least two weighing devices 500, and determining that the weighing device 500 is in a normal working state may include: acquiring detection data of each weighing device 500; and determining that the weighing device 500 is in a normal working state when the difference between the detection data of each weighing device 500 is within a preset error range.

[0142] In one embodiment of the present application, the control device is further configured to: when the difference between the detection data of any two weighing devices 500 is not within a preset error range, determine that the weighing device 500 has a fault and limit the movement of the aerial work platform.

[0143] In a specific embodiment, the weighing device 500 is taken as a pin shaft weighing sensor as an example. The pin shaft weighing sensor can be installed at the connection between the platform body 400 and the telescopic arm 120. The weight of the load on the platform body 400 is detected by the change of the strain gauge inside the pin shaft weighing sensor. The signal is then processed and transmitted to the control device of the whole machine through the acquisition module. The control device formulates safety logic in accordance with the safety regulations for aerial work products, and protects the safety of operators and equipment through sound and light alarms and action restrictions.

[0144] In the above embodiment, the number of the pin shaft weighing sensors may be two, and the control device may perform the following steps:

[0145] Step S201, start.

[0146] Step S202, determine whether the pin shaft weighing sensor is normal, if normal, proceed to step S203, otherwise proceed to step S204.

[0147] Step S203, determine whether the weighing calibration of the pin shaft weighing sensor is completed, if completed, proceed to step S205, otherwise proceed to step S206.

[0148] Step S204, reporting the failure of the axle load cell, giving an audible and visual alarm, and limiting the movement of the aerial work platform.

[0149] Step S205, obtaining the weight detection values ​​of the two pin shaft weighing sensors, and step S205 is followed by step S207 and step S208.

[0150] Step S206, reporting that the weighing calibration is not completed, sound and light alarms are given, and the movement of the aerial work platform is not restricted.

[0151] Step S207, determining whether the load rate of the platform body is greater than a set value (ie, a preset load rate threshold), if so, proceeding to step S209, otherwise returning to step S202.

[0152] Step S208, determine whether the weight detection values ​​of the two pin shaft weighing sensors are less than the reverse force alarm threshold (i.e., the preset reverse force judgment weight threshold). If so, proceed to step S210, otherwise return to step S202.

[0153] Step S209, reporting that the platform is overloaded, sound and light alarms are given, and the movement of the aerial work platform is restricted.

[0154] Step S210, reporting abnormal force on the platform body, sounding and visual alarm, and limiting the movement of the aerial work platform.

[0155] Regarding step S202, specifically, in order to ensure the normal operation of the equipment and protect the safety of people and machines, the platform load (i.e., weight) must be detected in real time. The pin shaft weighing sensor can communicate with the control device of the whole machine using a preset communication protocol. When the control device of the whole machine fails to receive data within a set time or receives a predetermined fault message, it reports a communication fault or hardware fault of the corresponding pin shaft weighing sensor. In order to ensure the safety of people and machines, the equipment action is restricted at this time.

[0156] In order to protect the safety of personnel and equipment, the key component pin shaft weighing sensor must meet the redundant detection requirements. Two strain gauges are arranged crosswise inside the pin shaft weighing sensor, and the force transmitted from the platform is detected at the same time. The signal is sent to the control device of the whole machine through different fields to realize the dual-channel redundant design. The difference between the detection values ​​of the two fields is judged inside the control device of the whole machine. If the difference exceeds the set value, the dual-channel verification error of the pin shaft weighing sensor is reported. At this time, the pin shaft weighing sensor is also considered to be faulty, and the equipment action is restricted.

[0157] Regarding step S203, specifically, when the platform body 400 is unloaded and in a lifted state and there are no obstacles or interferences below, the sum of the weight values ​​detected by the two pin shaft weighing sensors at this time is used as a reference value of the unloaded platform body, that is, the unloaded weight value is obtained. Further, in the program of the control device of the whole machine of the aerial work platform, the fully loaded weight value, that is, the preset maximum load weight, can be pre-set.

[0158] Regarding step S207, specifically, the control device of the whole machine can obtain the platform load in real time. When the load is added to the platform body, the calculation formula of the load rate can be:

[0159]

[0160] Among them, G 1 , G 2 are the weight detection values ​​of the two pin weighing sensors, G 0 is the empty weight of the platform, G maxThe setting value of the platform fully loaded, that is, the preset maximum load weight. The control device of the whole machine can calculate the load rate in real time. When the load rate exceeds the set percentage, the control device of the whole machine will send out an audible and visual alarm signal and limit the operation of the equipment.

[0161] Regarding step S207, specifically, in order to prevent the platform body 400 from squeezing the operator or obstacles when it descends, causing personal injury or equipment damage. The control device of the whole machine detects the load of the platform body in real time. When the pin shaft weighing sensor is in a normal state, the minimum weight detection value should be the weight value of the platform body 400 when it is in an unloaded state, that is, the weight value of the platform body 400 itself. If the weight value detected by the pin shaft weighing sensor is less than the reverse force alarm threshold, it is considered that the platform body 400 is subjected to the reverse force, such as a wooden block supporting it from below. At this time, the platform force can be reported to be abnormal, and the platform is restricted from continuing to descend. It can be understood that the reverse force alarm threshold should be as small as possible from the weight value of the platform body 400 itself, because when the platform body 400 is lifted and lowered, it will produce impact due to inertia, causing the weight value detected by the pin shaft weighing sensor to fluctuate, which may be smaller than the actual value. Therefore, in order to prevent false alarms, the reverse force alarm threshold should be as small as possible from the weight value of the platform body 400 itself.

[0162] like Figure 1 , Figures 6 to 10 In one embodiment of the present application, the chassis device 700 is laterally enclosed by the installation side plate 710 to form a storage space. The storage position detection device 600 includes a swing-rod type position detection switch. The main body 610 of the position detection switch is arranged on the side of the installation side plate 710 away from the storage space, and the installation side plate 710 is provided with an installation opening 711 for the swing rod part 620 of the position detection switch to extend to the storage space, and the trigger block 130 can abut against the swing rod part 620. By arranging the main body 610 of the position detection switch on the side of the installation side plate 710 away from the storage space, it can not only play a certain protective role, but also make the disassembly and assembly of the position detection switch on the outside of the storage space. Compared with the narrow storage space, it is obviously more convenient to disassemble and assemble on the outside. Specifically, the installation opening 711 is opened at the upper end of the installation side plate 710.

[0163] In one embodiment of the present application, the mounting opening 711 is disposed on one side of the lifting arm device 100, and 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 disposed at a position corresponding to the mounting opening 711, that is, the main body 610 is also disposed on one side of the lifting arm device 100, so as to facilitate 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 disposed on the main body 610 and extending from the mounting opening 711 to the storage space, and a rocker arm body rotatably sleeved on the rocker arm mounting shaft. The trigger block 130 is disposed on the side of the outermost telescopic arm 120 facing the mounting opening 711, and is formed. The abutting surface 131 abutting against the swing arm body laterally, specifically, the abutting surface 131 is set to face a side of the swing arm body, and the abutting surface 131 includes a chamfered inclined surface 132 and a vertical plane 133 arranged sequentially from bottom to top. In the process of the telescopic arm 120 retracting and descending, the chamfered inclined surface 132 first presses down the swing arm body, so that the swing arm body swings downward at a certain angle to an inclined state. As the telescopic arm 120 continues to retract and descend, under the guidance of the chamfered inclined surface 132, it switches to the vertical plane 133 to continue to abut against the wheel body 624 on the swing arm body, and because the swing arm body is inclined, the vertical plane 133 continues to apply pressure to the swing arm body, so that the vertical plane 133 can laterally press against the swing arm body when the telescopic arm 120 is lowered into place. The addition of the chamfered inclined surface 132 facilitates the smooth guidance of the swing arm body to press against the swing arm body laterally.

[0164] 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.

[0165] like Figure 2 and Figure 3As shown, in one embodiment of the present application, the platform body 400 and the outermost telescopic joint arm 120 are provided with a first connection part 410 and a second connection part 140 in one-to-one correspondence, and the weighing device 500 includes a pin shaft weighing sensor connected to the control device in communication, and the pin shaft weighing sensor is connected in series with the first connection part 410 and the second connection part 140. That is, by connecting the first connection part 410 and the second connection part 140 in series with the pin shaft weighing sensor, the connection between the platform body 400 and the lifting arm device 100 is realized, and the load weight on the platform body 400 is detected, killing two birds with one stone. Specifically, the number of the first connection part 410, the second connection part 140 and the pin shaft weighing sensor is two, and the two second connection parts 140 are arranged in sequence along the width direction of the outermost telescopic joint arm 120. The two first connection parts 410 are arranged on one side of the platform body 400 in one-to-one correspondence with the two second connection parts 140, and the two pin shaft weighing sensors are connected in series with the correspondingly arranged first connection parts 410 and second connection parts 140 in one-to-one correspondence.

[0166] See also Figures 2 to 4 In one embodiment of the present application, a first cross bar 421 and a second cross bar 422 are provided on one side of a protective fence 420 of a platform body 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 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. The second connecting portion 140 includes a second connecting ear plate extending laterally from the lifting arm device 100. The second connecting ear plate can extend between the two first connecting ear plates and be connected in series through a pin shaft weighing sensor. The first connection part 410 is configured to include two first connection ear plates, and the upper and lower ends of the two first connection ear plates are provided with cross bars, so that the connection between the first connection part 410 and the second connection part 140 can be more stable, and the two cross bars can also serve as stops for the second connection ear plate when it is inserted between the two first connection ear plates and the hole position is adjusted. Specifically, two nylon clamping pads are also sleeved on the pin shaft weighing sensor, and the two nylon clamping pads are respectively arranged in the gap between the two first connection ear plates and the second leveling ear plate.

[0167] See also Figures 2 to 5In one embodiment of the present application, the first connection ear plate and the second connection ear plate are respectively provided with the first connection hole and the second connection hole 142 in a one-to-one correspondence, the pin shaft load cell is inserted into the first connection hole and the second connection hole 142, and the upper end or the lower end of the second connection ear plate is provided with a clearance opening 141, and the clearance opening 141 is used to accommodate the corresponding cross bar when the first connection hole and the second connection hole 142 are aligned. The additional provision of the clearance opening 141 facilitates the alignment of the first connection hole and the second connection hole 142. Specifically, in the process of aligning the first connection hole and the second connection hole 142, the clearance opening 141 is first aligned with the corresponding cross bar, and then the alignment is moved so that the corresponding cross bar enters the clearance opening 141, and finally the alignment of the first connection hole and the second connection hole 142 is achieved by fine adjustment. It should be particularly noted that after the platform body 400 is connected to the lifting arm device 100, the clearance opening 141 does not apply a supporting force to the platform body 400, that is, there is a gap between the clearance opening 141 and the corresponding cross bar. 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 .

[0168] In one embodiment of the application, the lifting arm device 100 is further provided with a contact block 150, which can be specifically provided on the outermost telescopic arm. The contact block 150 is located at the lower side of the second connecting portion 140 and is provided with a nylon contact layer on the side facing the platform body 400. The nylon contact layer is used to make lateral contact with the base frame 430 of the platform body 400. The addition of the contact block 150 can avoid friction between the base frame 430 of the platform body 400 and the lifting arm device 100, and the addition of the nylon contact layer makes the contact block 150 and the base frame 430 in smooth contact. The contact block 150 does not exert a supporting effect on the platform body 400, thereby ensuring the accuracy of the weighing device 500. Specifically, there are two contact blocks 150, which are arranged in sequence along the width direction on the side of the lifting arm device 100 facing the platform body 400.

[0169] like Figure 2 , Fig.11 , Fig.12 , Figures 14 to 16 As shown, in one embodiment of the present application, the number of telescopic joint arms 120 is at least two, and at least two telescopic joint arms 120 are sequentially nested on the outside of the basic joint arm 110, and the telescopic joint arms 120 located on the inner side are respectively provided with a first tensioning wheel 121 and a second tensioning wheel 122 at the upper and lower ends, and the mast-type aerial work platform also includes:

[0170] The traction device 200 includes an extending traction member 210 and a retracting traction member 220. The extending traction member 210 is wound around the first tensioning wheel 121 and its two ends are respectively connected to the joint arms on the adjacent two sides. The retracting traction member 220 is wound around the second tensioning wheel 122 and its two ends are respectively connected to the joint arms on the adjacent two sides.

[0171] The hydraulic drive system 300 includes a telescopic cylinder 310 which is arranged on the basic boom 110 and is drivingly connected to the telescopic boom 120 located at the innermost side, and a pressure stop valve 320 in the rodless chamber return oil circuit connected to the telescopic cylinder 310. The pressure stop valve 320 is set to be turned on when the oil pressure in the rodless chamber return oil circuit reaches a preset load pressure.

[0172] In the above technical solution, since the telescopic boom 120 located on the inner side is provided with a first tensioning wheel 121 and a second tensioning wheel 122 at the upper and lower ends, the traction device 200 includes not only an extension traction member 210 wound around the first tensioning wheel 121, but also a retraction traction member 220 wound around the second tensioning wheel 122. Therefore, when the telescopic cylinder 310 drives the innermost telescopic boom 120 to extend, due to the action of the first tensioning wheel 121 on the extension traction member 210, the other telescopic booms 120 can be driven to extend synchronously. When the telescopic cylinder 310 drives the innermost telescopic boom 120 to retract, due to the action of the second tensioning wheel 122 on the retraction traction member 220, the other telescopic booms 120 can be driven to retract synchronously. When a telescopic arm 120 is stuck, due to the upward pulling effect of the retracting traction member 220, all the telescopic arms 120 will stop synchronously and no longer descend, thereby avoiding the phenomenon of loosening of the traction member. At the same time, a pressure stop valve 320 is added to the rodless chamber return oil circuit of the telescopic cylinder 310. Since the pressure stop valve 320 is turned on to prevent oil leakage only when the oil pressure in the rodless chamber return oil circuit reaches the preset load pressure, and when all the aforementioned telescopic arms 120 stop synchronously due to the sticking, the oil pressure in the rodless chamber return oil circuit will drop, causing the pressure stop valve 320 to respond as being non-conductive. Then, the rodless chamber of the telescopic cylinder 310 will not leak oil and maintain a certain back pressure. After the sticking is eliminated, the rapid falling phenomenon caused by the oil in the rodless chamber running out can be avoided, thereby achieving the purpose of improving safety performance.

[0173] Specifically, the number of telescopic joint arms 120 may be at least two, and the telescopic joint arms 120 located on the inner side refer to all telescopic joint arms 120 between the basic joint arm 110 and the outermost telescopic joint arm 120. It should be particularly noted that the joint arms on the adjacent two sides refer to the joint arms on the inner and outer sides of the telescopic joint arm 120 where the tensioning wheel currently installed is located.

[0174] The present application will be explained by taking a device with four telescopic arms 120 as an example, that is, the lifting arm device 100 has a total of five arms, which are, from the inside to the outside: a basic arm 110, a first telescopic arm, a second telescopic arm, a third telescopic arm and a fourth telescopic arm. The number of telescopic arms 120 located on the inner side is three, namely the first telescopic arm, the second telescopic arm and the third telescopic arm, and the telescopic cylinder 310 is drivingly connected to the first telescopic arm. In order to achieve synchronous extension and retraction of the remaining telescopic arms 120 following the first telescopic arm, the first telescopic arm, the second telescopic arm and the third telescopic arm are respectively provided with a first tensioning wheel 121 and a second tensioning wheel 122 at the upper and lower ends, and the two ends of the extended traction member 210 wound on the first tensioning wheel 121 of the first telescopic arm are both arranged downward and are respectively connected to the basic arm 110 and the second telescopic arm, the two ends of the extended traction member 210 wound on the first tensioning wheel 121 of the second telescopic arm are both arranged downward and are respectively connected to the first telescopic arm and the third telescopic arm, the two ends of the extended traction member 210 wound on the first tensioning wheel 121 of the third telescopic arm are both arranged downward and are respectively connected to the second telescopic arm and the fourth telescopic arm, the two ends of the extended traction member 210 wound on the first tensioning wheel 121 of the fourth telescopic arm are both arranged downward and are respectively connected to the third telescopic arm and the fifth telescopic arm 120, so as to achieve synchronous extension and retraction of the remaining telescopic arms 120 following the first tensioning wheel The second telescopic arm, the third telescopic arm and the fourth telescopic arm are realized to extend synchronously following the first telescopic arm; both ends of the retraction traction member 220 wound on the second tensioning wheel 122 of the first telescopic arm are arranged upward and are respectively connected to the basic arm 110 and the second telescopic arm, both ends of the retraction traction member 220 wound on the second tensioning wheel 122 of the second telescopic arm are arranged upward and are respectively connected to the first telescopic arm and the third telescopic arm, both ends of the retraction traction member 220 wound on the second tensioning wheel 122 of the third telescopic arm are arranged upward and are respectively connected to the second telescopic arm and the fourth telescopic arm, both ends of the retraction traction member 220 wound on the second tensioning wheel 122 of the fourth telescopic arm are arranged upward and are respectively connected to the third telescopic arm and the fifth telescopic arm 120, so as to realize the second telescopic arm, the third telescopic arm and the fourth telescopic arm to retract synchronously following the first telescopic arm.

[0175] See also Fig.14 and Fig.15In the first and second embodiments of the present application, the rodless chamber oil return oil circuit includes a reversing valve rear oil circuit 340 that connects the working oil port of the hydraulic reversing valve 330 and the rodless chamber of the telescopic oil cylinder 310, and the pressure cut-off valve 320 is arranged on the reversing valve rear oil circuit 340, that is, the pressure cut-off valve 320 can be arranged on the oil circuit between the telescopic oil cylinder 310 and the working oil port of the hydraulic reversing valve 330, and the pressure cut-off valve 320 includes two valve groups arranged in parallel, one of which includes a first check valve 321 that is conductive toward the oil inlet direction of the telescopic oil cylinder 310, and the other valve group includes a second check valve 322 that is conductive toward the oil outlet direction of the telescopic oil cylinder 310, and the second check valve 322 is set to be conductive when the oil pressure of the reversing valve rear oil circuit 340 reaches a preset load pressure. The pressure cut-off valve 320 is arranged on the reversing valve rear oil circuit 340, so that the position of the pressure cut-off valve 320 is closer to the rodless chamber, further reducing oil leakage. In addition, since the oil circuit 340 behind the reversing valve also needs to meet the demand for oil inlet to the rodless chamber, the pressure cut-off valve 320 can be set to include two valve groups, one of which can be conducted in the oil inlet direction through the first one-way valve 321, and the other valve group can be conducted in the oil return direction through the second one-way valve 322, and the second one-way valve 322 can be set to cut off and maintain oil when the oil pressure does not reach the preset load pressure, thereby meeting the above requirements.

[0176] Furthermore, when the telescopic arm 120 needs to be extended synchronously, the hydraulic reversing valve 330 is switched to connect the working oil port with the oil inlet of the hydraulic reversing valve 330, and the oil supply assembly 360 of the hydraulic control device 300 can supply oil to the rodless chamber from the valve group provided with the first one-way valve 321; when the telescopic arm 120 needs to be retracted synchronously, the hydraulic reversing valve 330 is switched to connect the working oil port with the oil return port of the hydraulic reversing valve 330, so that the oil in the rodless chamber can flow from the valve group provided with the second one-way valve 322 to the oil return port of the hydraulic reversing valve 330, and finally flow back to the oil tank.

[0177] like Fig.14As shown, in the first embodiment of the present application, a descending valve group 380 is provided between the rodless chamber of the telescopic oil cylinder 310 and the hydraulic reversing valve 330, and the reversing valve rear oil circuit 340 includes a descending valve front oil circuit 370 connecting the hydraulic reversing valve 330 and the descending valve group 380, wherein the pressure cut-off valve 320 can be provided on the descending valve front oil circuit 370 and is provided as a two-way check valve having a first check valve 321 and a second check valve 322. The pressure cut-off valve 320 provided on the reversing valve rear oil circuit 340 is selected as an existing two-way check valve, which can reduce the steps of self-design and production. Specifically, in the two valve groups of the two-way one-way valve, not only the second one-way valve 322 but also the first one-way valve 321 can set the opening pressure. However, in order to ensure the conduction in the oil inlet direction, the first one-way valve 321 can be set to open at a relatively small oil pressure, while the second one-way valve 322 is set to conduct only when the oil pressure reaches a preset load pressure. The preset load pressure can be set to be greater than or equal to half of the sum of the gravity of all telescopic arms 120, and less than the sum of the gravity of all telescopic arms 120.

[0178] like Fig.15 As shown, in the second embodiment of the present application, a descending valve group 380 is provided between the rodless chamber of the telescopic oil cylinder 310 and the hydraulic reversing valve 330, and the reversing valve rear oil circuit 340 includes a descending valve front oil circuit 370 connecting the hydraulic reversing valve 330 and the descending valve group 380, wherein the one-way valve on the descending valve rear oil inlet oil circuit 382 in the descending valve group 380 is set as a first one-way valve 321, and the second one-way valve 322 is provided on the descending valve rear oil return oil circuit 383 in the descending valve group 380. Therefore, the descending valve group 380 can also be improved so that the descending valve group 380 meets the requirement of cutting off and maintaining oil when the oil pressure does not reach the preset load pressure.

[0179] Specifically, the existing structure of the descending valve group 380 includes a descending valve body 381, a descending valve rear oil inlet circuit 382 and a descending valve rear oil return circuit 383. The descending valve rear oil inlet circuit 382 and the descending valve rear oil return circuit 383 are arranged in parallel, and one of the junction ends of the two is connected to the valve rear end of the descending valve body 381, and the other junction end is connected to the rodless chamber of the telescopic cylinder 310. The valve front end of the descending valve body 381 is connected to the hydraulic reversing valve 330 through the descending valve front oil circuit 370. The one-way valve on the descending valve rear oil inlet circuit 382 is set as a first one-way valve 321. The descending valve rear oil return circuit 383 originally only has a damper 384, and a second one-way valve 322 can be added to the descending valve rear oil return circuit 383.

[0180] like Fig.16As shown, in the third embodiment of the present application, the rodless chamber return oil circuit includes a first reversing valve front oil circuit 350 connecting the oil tank and the oil return port of the hydraulic reversing valve 330, and the pressure cut-off valve 320 is arranged on the first reversing valve front oil circuit 350, and the pressure cut-off valve 320 is set as a third one-way valve 323 or a back pressure valve with adjustable opening pressure. Providing the pressure cut-off valve 320 in the first reversing valve front oil circuit 350 makes it unnecessary to consider meeting the demand for oil inlet to the rodless chamber, and the structure is simpler and the cost is lower. Specifically, the hydraulic control device 300 also includes a second reversing valve front oil circuit arranged between the oil supply assembly 360 and the oil inlet of the hydraulic reversing valve 330, and the oil supply assembly 360 includes an oil pump and a driving member that drives the oil pump to rotate.

[0181] In one embodiment of the present application, the first tension wheel 121 and the second tension wheel 122 on the same telescopic joint arm 120 are arranged on the same side, and the traction device 200 further includes a first connection assembly 230 and a second connection assembly 240. The first connection assembly 230 is arranged at the upper end of the inner joint arm, and the upper and lower ends are respectively connected to the inner ends of the extension traction member 210 and the retraction traction member 220 on the same telescopic joint arm 120 in a one-to-one correspondence, and the second connection assembly 240 is arranged at the lower end of the outer joint arm, and the upper and lower ends are respectively connected to the outer ends of the extension traction member 210 and the retraction traction member 220 on the same telescopic joint arm 120 in a one-to-one correspondence. By adding the first connection assembly 230 and the second connection assembly 240, a traction module having both extension traction and retraction traction functions is arranged in a ring shape on one side of the telescopic joint arm 120, which can reduce the arrangement of connection assemblies compared to the solution of separately arranging the extension traction member 210 and the retraction traction member 220 on both sides. It should be particularly noted that the arm located on the inner side of the telescopic arm 120 where the tensioning wheel corresponding to the current traction member is located and is adjacent to it is the inner arm, and the arm located on the outer side of the telescopic arm 120 where the tensioning wheel corresponding to the current traction member is located and is adjacent to it is the outer arm. Of the two ends of the extended traction member 210 and the retracted traction member 220, the end located on the inner side is set as the inner end of the extended traction member 210 and the retracted traction member 220, and the end located on the outer side is set as the outer end of the extended traction member 210 and the retracted traction member 220.

[0182] In one embodiment of the present application, all traction devices 200 are arranged on the same side of the lifting arm device 100. That is, the first tensioning wheel 121 and the second tensioning wheel 122 on all telescopic arms 120 are also arranged on the same side, so that there is no need to leave a separate space on the other side of the lifting arm device 100 for arranging the tensioning wheel, thereby reducing the size of the lifting arm device 100 and achieving the purpose of reducing production costs.

[0183] In one embodiment of the present application, notches are formed on the same side at both the upper and lower ends of the telescopic arm 120, and a mounting shaft for mounting the first tension wheel 121 or the second tension wheel 122 is provided on the inner wall corresponding to the notch of the telescopic arm 120, and the tension wheel groups on different telescopic arms 120 are staggered in sequence along the width direction of the lifting arm device 100. By adding notches, the tension wheel can be arranged without extending out of the corresponding telescopic arm 120 in the height direction, which plays a certain protective role, and it is also convenient to arrange the mounting shaft, and the end of the mounting shaft can be directly connected to the adjacent side of the telescopic arm 120 without the notch. It should be particularly noted that the tensioning wheel group on the telescopic joint arm 120 is composed of a first tensioning wheel 121 and a second tensioning wheel 122 on the telescopic joint arm 120, and the first tensioning wheel 121 and the second tensioning wheel 122 in the tensioning wheel group should be set to be in the same vertical direction. In addition, the outermost telescopic joint arm 120 does not need to be provided with the first tensioning wheel 121 and the second tensioning wheel 122, so there is no need to form a notch.

[0184] See also Fig.12 and Fig.13 In one embodiment of the application, the first connection assembly 230 includes a first connection member 231 and a second connection member 232, which are respectively connected to the inner ends of the extension traction member 210 and the retraction traction member 220 on the same telescopic joint arm 120 in a one-to-one correspondence, the first connection member 231 is arranged on the inner wall of the inner joint arm, and the second connection member 232 is arranged on the outer wall of the inner joint arm and is located at the lower side of the first connection member 231. That is, the first connection assembly 230 is arranged in a split body, and the first connection member 231 for connecting with the extension traction member 210 is arranged on the inner wall of the inner joint arm, and the second connection member 232 for connecting with the retraction traction member 220 is arranged on the outer wall of the inner joint arm, which can facilitate disassembly and assembly. Specifically, when assembling the traction member, since the first connection assembly 230 is arranged near the upper end of the telescopic joint arm 120, it is convenient to extend the traction member 210 from the upper end of the inner joint arm into the joint arm inner cavity to connect with it. In order to play a protective role, the first connection member 231 can be arranged on the inner wall of the inner joint arm; while it is time-consuming and laborious to extend the retracting traction member 220 from the lower end of the inner joint arm into the joint arm inner cavity to connect with it. In order to facilitate the connection of the retracting traction member 220, the second connection member 232 can be arranged on the outer wall of the inner joint arm. Specifically, the first connection member 231 can be fixed to the inner joint arm by driving a fastener from the outer side of the inner joint arm, and the second connection member 232 can be fixed to the outer wall of the inner joint arm by welding.

[0185] In one embodiment of the present application, the second connection assembly 240 includes a third connection member 241, and the upper and lower ends of the third connection member 241 are respectively connected to the outer ends of the extension traction member 210 and the retraction traction member 220 on the same telescopic joint arm 120 in a one-to-one correspondence, and the third connection member 241 is arranged on the inner wall of the outer joint arm. Since the second connection assembly 240 is arranged close to the lower end of the telescopic joint arm 120, it is convenient for the retraction traction member 220 to extend from the lower end of the inner joint arm into the inner cavity of the joint arm to connect with it, and the addition of the notch can also facilitate the installation of the second connection assembly 240 or the extension traction member 210 in the inner cavity of the outer joint arm, so the second connection assembly 240 can be set as the third connection member 241 of the integrated structure, and it is arranged on the inner wall of the outer joint arm, so as to reduce the production cost and improve the production efficiency. Specifically, the third connection member 241 can be fixed to the outer joint arm by driving a fastener from the outer side of the outer joint arm.

[0186] Specifically, the installation method of the traction member can be: first, connect the two ends of the extended traction member 210 to the first connecting member 231 and the third connecting member 241 respectively; then install the first connecting member 231 on the inner section arm and connect one end of the retracted traction member 220 to the second connecting member 232; after the outer section arm is sleeved on the outside of the inner section arm, install the third connecting member 241 on the outer section arm and connect the other end of the retracted traction member 220 to the third connecting member 241.

[0187] In one embodiment of the present application, the extending traction member 210 is set as a chain. Compared with the wire rope, the chain has higher stability during the lifting process. The first connecting member 231 includes a fixed portion 233 and a swinging portion 234. The fixed portion 233 is arranged on the inner section arm and has a clamping space formed at the upper end. The lower end of the swinging portion 234 extends into the clamping space and is swingably arranged on the fixed portion 233 through a connecting pin shaft. The upper end of the swinging portion 234 is connected to the chain. By adding a swinging portion 234 to the first connecting member 231 and connecting it to the chain, the function of automatic return can be achieved. Specifically, the upper end of the swinging portion 234 is set to be detachably connected to the chain, and the retracting traction member 220 can be set as a wire rope.

[0188] Furthermore, the third connecting member 241 can also be configured to include a fixed portion 233 and a swinging portion 234. The fixed portion 233 of the third connecting member 241 is arranged on the outer segment arm and a clamping space is formed at the upper end. The lower end of the swinging portion 234 extends into the clamping space and is swingably arranged on the fixed portion 233 through a connecting pin shaft. The upper end of the swinging portion 234 is connected to the chain, and the lower end of the fixed portion 233 of the third connecting member 241 is provided with a structure that can be connected to the retracting traction member 220.

[0189] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0190] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0191] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 application. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0192] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A mast-type aerial work platform, characterized in that: The mast-type aerial work platform comprises: A chassis device (700), wherein a storage space is enclosed on the chassis device (700); A lifting arm device (100), wherein the lower end of a basic arm section (110) of the lifting arm device (100) is arranged in the storage space, a telescopic arm section (120) of the lifting arm device (100) is arranged on the outer side of the basic arm section (110) so as to be liftable, and a trigger block (130) is arranged on the peripheral side of the outermost telescopic arm section (120); A platform body (400) is arranged on the outermost telescopic arm (120); The storage position detection device (600) is arranged on the side of the storage space corresponding to the trigger block (130) and can be triggered under the lateral abutment of the trigger block (130).

2. The mast-type aerial work platform according to claim 1, characterized in that: The mast-type aerial work platform further comprises a hydraulic drive system (300), a weighing device (500), a pressure detection device, an abnormal lifting alarm device and a control device. The hydraulic drive system (300) can drive the telescopic boom (120) to lift and lower. The weighing device (500) is used to detect the weight of the platform body (400). The pressure detection device is used to detect the oil pressure of the telescopic cylinder (310) in the hydraulic drive system (300). The control device is respectively connected to the weighing device (500), the pressure detection device and the abnormal lifting alarm device and is configured as follows: When it is determined that the platform body (400) is in a lifting stop state, obtaining a first pressure value detected by a pressure detection device and a first weight value detected by a weighing device (500); After a first preset time interval, obtaining a second pressure value detected by the pressure detection device and a second weight value detected by the weighing device (500); When the deviation between the first pressure value and the second pressure value is greater than a preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than a preset weight deviation threshold, it is determined that the platform body (400) is in an abnormal lifting state and the abnormal lifting alarm device is controlled to issue an abnormal lifting prompt.

3. The mast-type aerial work platform according to claim 2, characterized in that: The abnormal lifting state includes an abnormal descending state and an abnormal ascending state; when the deviation between the first pressure value and the second pressure value is greater than a preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than a preset weight deviation threshold, determining that the platform body (400) is in an abnormal lifting state and controlling the abnormal lifting alarm device to issue an abnormal lifting prompt, comprises: When the first pressure value is greater than the second pressure value and the deviation between the first pressure value and the second pressure value is greater than a preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is less than a preset weight deviation threshold, it is determined that the platform body (400) is in an abnormal descent state and the abnormal lifting alarm device is controlled to give an abnormal descent prompt; or When the first pressure value is smaller than the second pressure value and the deviation between the first pressure value and the second pressure value is larger than a preset pressure deviation threshold, and the deviation between the first weight value and the second weight value is smaller than a preset weight deviation threshold, it is determined that the platform body (400) is in an abnormal ascent state and the abnormal ascent alarm device is controlled to issue an abnormal ascent prompt.

4. The mast-type aerial work platform according to claim 2, characterized in that: The step of determining that the platform body (400) is in a lifting stop state comprises: In the case where no trigger signal from the storage position detection device (600) is received, determining that the platform body (400) is in a lifted state; When no lifting signal instruction is received for a second preset time period, it is determined that the platform body (400) is in a lifting stop state.

5. The mast-type aerial work platform according to claim 2, characterized in that: The control device is also configured to: Obtaining a third weight value detected by a weighing device (500); Determining that the third weight value is less than a preset reverse force judgment weight threshold, wherein the preset reverse force judgment weight threshold is less than a predetermined empty-load weight value of the platform body (400), and the empty-load weight value is the weight value of the platform body (400) when it is in an empty-load lifting state and there is no interference under the platform body (400); It is determined that there is an interference object below the platform body (400) and the movement of the mast-type aerial work platform is restricted.

6. The mast-type aerial work platform according to claim 5, characterized in that: After obtaining the third weight value detected by the weighing device (500), the method further includes: In the case where the third weight value is greater than the empty weight value, determining a weight difference between the third weight value and the empty weight value; Determining the ratio of the weight difference to the preset maximum load-bearing weight of the platform body (400) to obtain a load rate; When the load rate is greater than a preset load rate threshold, the platform body (400) is determined to be overloaded and the movement of the mast-type aerial work platform is restricted.

7. The mast-type aerial work platform according to claim 6, characterized in that: The control device is also configured to: When the third weight value is greater than or equal to the preset reverse force judgment weight threshold, and / or the load rate is less than or equal to the preset load rate threshold, it is determined that the platform body (400) is in a normal working state and the movement of the mast-type aerial work platform is not restricted.

8. The mast-type aerial work platform according to any one of claims 1 to 7, characterized in that: The storage space is formed by laterally enclosing the chassis device (700) by installing a side plate (710). The storage position detection device (600) includes a rocker-type position detection switch. The main body (610) of the position detection switch is arranged on a side of the installation side plate (710) away from the storage space. The installation side plate (710) is provided with an installation opening (711) for the rocker portion (620) of the position detection switch to extend toward the storage space. The trigger block (130) can abut against the rocker portion (620).

9. The mast-type aerial work platform according to claim 8, characterized in that: The mounting opening (711) is arranged on one side of the lifting arm device (100), and the rocker arm portion (620) includes a rocker arm mounting shaft arranged on the main body (610) and extending from the mounting opening (711) to the storage space, and a rocker arm body rotatably sleeved on the rocker arm mounting shaft. The trigger block (130) is arranged on the side of the outermost telescopic arm (120) facing the mounting opening (711), and is formed with an abutment surface (131) abutting against the rocker arm body laterally. The abutment 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 arm body and guide the rocker arm body to the vertical plane (133), so that the vertical plane (133) can laterally press against the rocker arm body when the outermost telescopic arm (120) is lowered to the storage position.

10. The mast-type aerial work platform according to claim 2, characterized in that: The platform body (400) and the outermost telescopic arm (120) are provided with a first connecting portion (410) and a second connecting portion (140) correspondingly, and the weighing device (500) includes a pin shaft weighing sensor which 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). A contact block (150) is also provided on the outermost telescopic arm (120), and the contact block (150) is located on the lower side of the second connecting portion (140) and is provided with a nylon contact layer on the side facing the platform body (400), and the nylon contact layer is used for lateral contact with the base frame (430) of the platform body (400).

11. The mast-type aerial work platform according to any one of claims 1 to 7, characterized in that: The number of the telescopic joint arms (120) is at least two, and at least two of the telescopic joint arms (120) are sequentially nested on the outside of the basic joint arm (110), and the telescopic joint arms (120) located on the inner side are each provided with a first tensioning wheel (121) and a second tensioning wheel (122) at the upper and lower ends, respectively. The mast-type aerial work platform also includes: The traction device (200) comprises an extending traction member (210) and a retracting traction member (220), wherein the extending traction member (210) is wound around the first tensioning wheel (121) and its two ends are respectively connected to the joint arms on two adjacent sides, and the retracting traction member (220) is wound around the second tensioning wheel (122) and its two ends are respectively connected to the joint arms on two adjacent sides; The hydraulic drive system (300) comprises a telescopic oil cylinder (310) which is arranged on the basic joint arm (110) and is drivingly connected to the telescopic joint arm (120) located at the innermost side, and a pressure cut-off valve (320) in the rodless chamber return oil circuit connected to the telescopic oil cylinder (310), wherein the pressure cut-off valve (320) is set to be conductive when the oil pressure in the rodless chamber return oil circuit reaches a preset load pressure.

12. The mast-type aerial work platform according to claim 11, characterized in that: The rodless chamber oil return oil circuit includes a working oil port connected to a hydraulic reversing valve (330) and a reversing valve rear oil circuit (340) of the rodless chamber of the telescopic oil cylinder (310); the pressure stop valve (320) is arranged on the reversing valve rear oil circuit (340), and the pressure stop valve (320) includes two valve groups arranged in parallel, one of which includes a first one-way valve (321) conducting in the oil inlet direction of the telescopic oil cylinder (310), and the other includes a second one-way valve (322) conducting in the oil outlet direction of the telescopic oil cylinder (310); the second one-way valve (322) is set to conduct when the oil pressure in the reversing valve rear oil circuit (340) reaches a preset load pressure.

13. The mast-type aerial work platform according to claim 12, characterized in that: A descending valve group (380) is provided between the rodless chamber of the telescopic oil cylinder (310) and the hydraulic reversing valve (330), and the reversing valve rear oil circuit (340) includes a descending valve front oil circuit (370) connecting the hydraulic reversing valve (330) and the descending valve group (380); The pressure stop valve (320) is arranged on the oil circuit (370) before the descending valve and is set as a two-way check valve having the first check valve (321) and the second check valve (322), or the check valve on the oil inlet circuit (382) after the descending valve in the descending valve group (380) is set as the first check valve (321), and the second check valve (322) is arranged on the oil return circuit (383) after the descending valve in the descending valve group (380).

14. The mast-type aerial work platform according to claim 11, characterized in that: The rodless chamber oil return circuit comprises a first reversing valve front oil circuit (350) connecting an oil tank and an oil return port of a hydraulic reversing valve (330); the pressure stop valve (320) is arranged on the first reversing valve front oil circuit (350); the pressure stop valve (320) is arranged as a third one-way valve (323) or a back pressure valve with adjustable opening pressure.

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