Aerial work device and safety protection device applied to aerial work platform

Abstract

The utility model discloses a high-altitude operation device and a safety protection device applied to a high-altitude operation platform, and relates to the technical field of high-altitude operation, and the safety protection device applied to the high-altitude operation platform comprises a cylinder barrel; a piston rod that telescopically moves along the cylinder; the gravity descending valve has a self-locking function and is arranged on one side of the cylinder barrel; the working loop communicates with one side of the cylinder barrel so as to supply oil to the oil cavity of the cylinder barrel, and the gravity descending valve is used for controlling the working loop to supply oil to the oil cavity and return oil to the oil cavity; the detection device is used for detecting whether the gravity drop valve fails or not; the safety loop is communicated with the other side of the cylinder barrel so as to supply oil to the oil cavity when the gravity drop valve fails; and the working loop, the safety loop, the detection device and the gravity drop valve are all connected with the control device. The device can relieve the rapid falling phenomenon of the main arm when the gravity falling valve loses efficacy and the main arm rapidly falls, and the safety of workers on a working platform is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of aerial work, and more specifically, to a safety protection device applied to an aerial work platform. In addition, it also relates to an aerial work device including the above-mentioned safety protection device applied to an aerial work platform. Background Art

[0002] In the prior art, the main boom of an aerial work device is lifted by a lifting oil cylinder driven by a lifting oil cylinder, and the lifting oil cylinder is controlled by a gravity drop valve. When the gravity drop valve fails, it is easy to cause the main boom to stall and drop, causing the piston rod of the lifting oil cylinder to retract to the shortest posture. During the rapid descent of the main boom, a huge impact force will occur, causing injuries to the operators on the work platform at the upper part of the main boom, and in severe cases, it will cause the whole machine to tip over, resulting in casualties of the operators.

[0003] In summary, how to alleviate the rapid descent of the main boom and protect the safety of the work platform personnel when the gravity drop valve fails and the main boom falls rapidly is an urgent problem to be solved by those skilled in the art at present. Summary of the Utility Model

[0004] In view of this, an object of the utility model is to provide a safety protection device applied to an aerial work platform, which can alleviate the rapid descent of the main boom and protect the safety of the work platform personnel when the gravity drop valve fails and the main boom falls rapidly.

[0005] Another object of the utility model is to provide an aerial work device including the above-mentioned safety protection device applied to an aerial work platform.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] A safety protection device applied to an aerial work platform, comprising:

[0008] A cylinder barrel;

[0009] A piston rod that telescopically moves along the cylinder barrel;

[0010] A gravity drop valve with a self-locking function, which is arranged on one side of the cylinder barrel;

[0011] A working circuit that communicates with one side of the cylinder barrel to supply oil to the oil cavity of the cylinder barrel, and the gravity drop valve is used to control the supply and return of oil from the working circuit to the oil cavity;

[0012] A detection device for detecting whether the gravity drop valve fails;

[0013] A safety circuit that communicates with the other side of the cylinder barrel to supply oil to the oil cavity when the gravity drop valve fails;

[0014] A control device, the working circuit, the safety circuit, the detection device and the gravity lowering valve are all connected to the control device.

[0015] In one embodiment, the safety circuit is communicated with the oil cavity through a check valve and a joint.

[0016] In one embodiment, the safety circuit includes an emergency power supply, an emergency power device connected to the emergency power supply, and an emergency lowering valve. The emergency power device and the check valve are communicated through a safety hydraulic oil pipe. An emergency lowering valve is provided on the safety hydraulic oil pipe, and the emergency power device is connected to the control device.

[0017] In one embodiment, the working circuit includes a main power supply, a driving pump connected to the main power supply, and a main valve. The driving pump and the gravity lowering valve are communicated through a working hydraulic oil pipe. The main valve is provided on the working hydraulic oil pipe, and the driving pump is connected to the control device.

[0018] An aerial work device includes the safety protection device for an aerial work platform as described in any one of the above.

[0019] In one embodiment, it further includes a main boom, a working platform provided at one end of the main boom, and a fixed seat. The other end of the main boom is hinged to the fixed seat, and the cylinder barrel of the safety protection device for an aerial work platform is provided on the fixed seat.

[0020] In one embodiment, it further includes a chassis assembly for realizing movement, and the chassis assembly is provided below the fixed seat.

[0021] In one embodiment, a guardrail is provided around the working platform, and an anti-slip pad is provided at the bottom of the working platform.

[0022] In one embodiment, the detection device of the safety protection device for an aerial work platform includes an angle sensor provided on the main boom;

[0023] The control device of the safety protection device for an aerial work platform includes a first calculator for converting the angle data detected by the angle sensor into the lowering speed of the main boom, a first judge for judging whether the lowering speed of the main boom is greater than a first safety value, and a first actuator. The first actuator is used to control the operation of the safety circuit when the lowering speed of the main boom is greater than the first safety value.

[0024] In one embodiment, the detection device of the safety protection device for an aerial work platform includes a displacement sensor provided at the telescopic end of the piston rod;

[0025] The control device applied to the safety protection device of the aerial work platform includes a second calculator for converting the displacement data detected by the displacement sensor into the descending speed of the piston rod, a second judge for judging whether the descending speed of the piston rod is greater than a second safety value, and a second actuator for controlling the operation of the safety circuit when the descending speed of the piston rod is greater than the second safety value.

[0026] When using the safety protection device for the aerial work platform provided by the present utility model, the piston rod and the main boom can be hinged to drive the main boom to achieve a lifting operation. When the gravity lowering valve fails, the gravity lowering valve cannot be automatically locked and cannot control the working circuit to continue supplying oil to the oil chamber of the cylinder barrel. At this time, under the action of the gravity of the main boom, the piston rod will quickly retract relative to the cylinder barrel, resulting in the rapid descent of the main boom. When the main boom descends rapidly, it will drive the working platform to descend rapidly, and there will be potential safety hazards for the operators on the working platform. At the same time, the detection device can timely detect whether the gravity lowering valve fails and transmit the detection signal to the control device in real time. Therefore, when the gravity lowering valve fails, the control device can control the operation of the safety circuit to supply oil to the cylinder barrel through the safety circuit, reduce the retraction speed of the piston rod relative to the cylinder barrel, so that the descending speed of the main boom reaches the safe descending speed, and the main boom descends slowly.

[0027] When the piston rod retracts to the shortest structural state, the main boom safely descends to the stowed state, thereby protecting the working platform from descending to a safe position, and the safety of the operators in the working platform can be guaranteed. That is to say, the device can provide safety protection when the gravity lowering valve fails and the main boom descends rapidly and stalls. When the gravity lowering valve fails, the control device can actively control the safety circuit to supply oil to the oil chamber of the cylinder barrel, so that the main boom descends smoothly (at a safe descending speed) to the lowest posture, ensuring the safety of the operators on the working platform.

[0028] In summary, the safety protection device for the aerial work platform provided by the present utility model alleviates the rapid descent of the main boom and protects the safety of the personnel on the working platform when the gravity lowering valve fails and the main boom falls rapidly.

[0029] In addition, the present utility model also provides an aerial work device including the above-mentioned safety protection device for the aerial work platform. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0031] Figure 1 The structural schematic diagram of the safety protection device applied to the aerial work platform provided by the present utility model;

[0032] Figure 2 The structural schematic diagram of the aerial work device;

[0033] Figure 3 The structural schematic diagram of the working circuit, safety circuit and lifting cylinder.

[0034] Reference numerals:

[0035] 1 - cylinder barrel; 2 - check valve; 3 - joint; 4 - gravity descent valve; 5 - piston rod; 6 - safety circuit; 61 - emergency power supply; 62 - emergency power device; 63 - emergency descent valve; 7 - working circuit; 71 - main power supply; 72 - main pump; 73 - main valve; 8 - working hydraulic oil pipe; 9 - safety hydraulic oil pipe; 10 - fixed seat; 11 - angle sensor; 12 - lifting cylinder; 13 - main boom; 14 - working platform; 15 - control device. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0037] The core of the present utility model is to provide a safety protection device applied to an aerial work platform, which can relieve the rapid falling phenomenon of the main boom and protect the safety of the personnel on the working platform when the gravity descent valve fails and the main boom falls rapidly. Another core of the present utility model is to provide an aerial work device including the above safety protection device applied to the aerial work platform.

[0038] Please refer to Figures 1 to 3 , Figure 1 The structural schematic diagram of the safety protection device applied to the aerial work platform provided by the present utility model; Figure 2 The structural schematic diagram of the aerial work device; Figure 3 The structural schematic diagram of the working circuit, safety circuit and lifting cylinder.

[0039] This specific embodiment provides a safety protection device applied to an aerial work platform, including:

[0040] Cylinder barrel 1;

[0041] Piston rod 5, which moves telescopically along cylinder barrel 1;

[0042] A gravity drop valve 4, which has a self-locking function, is arranged on one side of the cylinder barrel 1;

[0043] A working circuit 7, which is communicated with one side of the cylinder barrel 1 to supply oil to the oil chamber of the cylinder barrel 1, and the gravity drop valve 4 is used to control the supply and return of oil in the working circuit 7 to the oil chamber;

[0044] A detection device, which is used to detect whether the gravity drop valve 4 fails;

[0045] A safety circuit 6, which is communicated with the other side of the cylinder barrel 1 to supply oil to the oil chamber when the gravity drop valve 4 fails;

[0046] A control device 15, and the working circuit 7, the safety circuit 6, the detection device and the gravity drop valve 4 are all connected to the control device 15.

[0047] It should be noted that the cylinder barrel 1 and the piston rod 5 can form a lifting oil cylinder 12. The oil inlet and return of the working circuit 7 of the present application are controlled by the gravity drop valve 4. At the same time, the gravity drop valve 4 has a self-locking function. When the gravity drop valve 4 does not fail, it can ensure the normal operation of the working circuit 7 and realize the locking operation of the lifting oil cylinder 12. When the gravity drop valve 4 fails, the control device 15 can actively control the safety circuit 6 to supply oil to the lifting oil cylinder 12, so that the main boom 13 slowly descends to the lowest posture.

[0048] In the actual application process, according to the actual situation and actual needs, the shapes, structures, types, positions, etc. of the cylinder barrel 1, the piston rod 5, the gravity drop valve 4, the working circuit 7, the detection device, the safety circuit 6 and the control device 15 can be determined.

[0049] When using the safety protection device for an aerial work platform provided by the present utility model, the piston rod 5 and the main boom 13 can be hinged to drive the main boom 13 to realize the lifting operation. When the gravity drop valve 4 fails, the gravity drop valve 4 cannot automatically lock and cannot control the working circuit 7 to continue supplying oil to the oil chamber of the cylinder barrel 1. At this time, under the action of the gravity of the main boom 13, the piston rod 5 will quickly retract relative to the cylinder barrel 1, resulting in the rapid descent of the main boom 13. When the main boom 13 descends rapidly, it will drive the working platform 14 to descend rapidly, and there will be potential safety hazards for the operators on the working platform 14. At the same time, the detection device can timely detect whether the gravity drop valve 4 fails and transmit the detection signal to the control device 15 in real time. Therefore, when the gravity drop valve 4 fails, the control device 15 can control the operation of the safety circuit 6 to supply oil to the cylinder barrel 1 through the safety circuit 6, reduce the retraction speed of the piston rod 5 relative to the cylinder barrel 1, so that the descent speed of the main boom 13 reaches the safe descent speed, and the main boom 13 slowly descends.

[0050] When the piston rod 5 retracts to the shortest state of the structure, the main boom 13 safely descends to the stowed state, thereby protecting the work platform 14 from descending to a safe position, and the safety of the operators inside the work platform 14 can be guaranteed. That is, this device can provide safety protection when the gravity drop valve 4 fails and the main boom 13 rapidly descends and stalls. When the gravity drop valve 4 fails, the control device 15 can actively control the safety circuit 6 to supply oil to the oil chamber of the cylinder barrel 1, so that the main boom 13 slowly descends (at a safe descending speed) to the lowest posture, ensuring the safety of the operators on the work platform 14.

[0051] In summary, the safety protection device for an aerial work platform provided by the present utility model alleviates the phenomenon of rapid descent of the main boom and protects the safety of the personnel on the work platform when the gravity drop valve fails and the main boom rapidly falls.

[0052] In one embodiment, the safety circuit 6 is connected to the oil chamber through the one-way valve 2 and the joint 3, so that when the safety circuit 6 supplies oil to the lifting cylinder 12, it only supplies oil unidirectionally, preventing the oil from flowing back into the safety circuit 6.

[0053] In one embodiment, the safety circuit 6 includes an emergency power supply 61, an emergency power device 62 connected to the emergency power supply 61, and an emergency descent valve 63. The emergency power device 62 and the one-way valve 2 are connected through a safety hydraulic oil pipe 9. The emergency descent valve 63 is provided on the safety hydraulic oil pipe 9. The emergency power device 62 is connected to the control device 15, and the structure is as Figure 3 shown. That is, the safety circuit 6 has an independent power supply from the emergency power supply 61, the emergency power device 62 provides power, and the emergency descent valve 63 independently controls the oil supply to the lifting cylinder 12, so as to provide safety protection for the main boom 13 through the program control inside the control device 15, avoiding safety accidents caused by the rapid descent of the main boom 13 when the gravity drop valve 4 fails.

[0054] In one embodiment, the working circuit 7 includes a main power supply 71, a driving pump 72 connected to the main power supply 71, and a main valve 73. The driving pump 72 and the gravity drop valve 4 are connected through a working hydraulic oil pipe 8. The main valve 73 is provided on the working hydraulic oil pipe 8. The driving pump 72 is connected to the control device 15, and the structure is as Figure 3 shown. Therefore, when the gravity drop valve 4 does not fail, the control device 15 can control the operation of the gravity drop valve 4 and the driving pump 72 to supply oil or return oil to the lifting cylinder 12 through the working circuit 7, thereby realizing the telescopic operation of the lifting cylinder 12.

[0055] In addition to the above safety protection device for an aerial work platform, the present utility model also provides an aerial work device including the safety protection device for an aerial work platform disclosed in the above embodiment. For the structures of other parts of this aerial work device, please refer to the prior art and will not be elaborated herein.

[0056] In one embodiment, it further includes a main arm 13, a working platform 14 provided at one end of the main arm 13, and a fixed seat 10. The other end of the main arm 13 is hinged to the fixed seat 10. The cylinder barrel 1 applied to the safety protection device of the aerial work platform is provided on the fixed seat 10, and the structure is as Figure 2 shown. The control device 15 can control the operation of the working circuit 7 by controlling the gravity drop valve 4, and can control the safety circuit 6 to supply oil to the lifting cylinder 12 when the gravity drop valve 4 fails, so as to prevent the main arm 13 from rapidly descending when the working circuit 7 stops supplying oil, thus avoiding safety accidents.

[0057] In one embodiment, it further includes a chassis assembly for realizing movement, and the chassis assembly is provided below the fixed seat 10. Therefore, the spatial movement of the device can be realized by controlling the operation of the chassis assembly.

[0058] In one embodiment, a guardrail is provided around the working platform 14, and an anti-slip pad is provided at the bottom of the working platform 14. The guardrail can prevent the operator from falling from the working platform 14, and the anti-slip pad can prevent the operator from slipping on the working platform 14.

[0059] In one embodiment, the detection device applied to the safety protection device of the aerial work platform includes an angle sensor 11 provided on the main arm 13; the control device 15 applied to the safety protection device of the aerial work platform includes a first calculator for converting the angle data detected by the angle sensor 11 into the descending speed of the main arm 13, a first judge for judging whether the descending speed of the main arm 13 is greater than a first safety value, and a first actuator. The first actuator is used to control the operation of the safety circuit 6 when the descending speed of the main arm 13 is greater than the first safety value.

[0060] It should be noted that during use, the angle sensor 11 can detect the angle value in real time when the main arm 13 descends. The first calculator of the control device 15 can calculate the angle change value when the main arm 13 descends. Since the length of the main arm 13 is fixed, the first calculator can further convert to obtain the descending height and descending speed of the main arm 13. At the same time, the first judge can judge in real time whether the descending speed of the main arm 13 is greater than the first safety value. When the descending speed of the main arm 13 is greater than the first safety value, it indicates that the gravity drop valve 4 fails, that is, the working circuit 7 cannot supply oil to the lifting cylinder 12 normally, and it is easy for the main arm 13 to rapidly descend. At this time, the control device 15 can control the operation of the safety circuit 6 to supply oil to the lifting cylinder 12 through the safety circuit 6, so that the piston rod 5 of the lifting cylinder 12 slowly retracts, so that the main arm 13 descends smoothly and finally reaches the lowest posture.

[0061] It should be noted that when the gravity drop valve 4 fails, the lifting cylinder 12 cannot be locked. Under the action of the gravity of the main boom 13, the piston rod 5 of the lifting cylinder 12 will quickly retract, causing the main boom 13 to quickly descend, and then driving the working platform 14 to quickly descend, posing a safety hazard to the operator on the working platform 14. The angle signal detected by the angle sensor 11 is transmitted to the control device 15. The first calculator calculates and converts the angle signal, and then the first judge determines whether the descending speed of the main boom 13 exceeds the first safety value. If so, the safety circuit 6 is activated to supply oil to the cylinder barrel 1 of the lifting cylinder 12, reducing the retraction speed of the lifting cylinder 12, so that the descending speed of the main boom 13 reaches the first safety value, causing the main boom 13 to descend slowly; when the lifting cylinder 12 descends to the shortest structural state, the main boom 13 safely descends to the stowed state, thereby protecting the working platform 14 from descending to a safe position and ensuring the safety of the operator on the working platform 14.

[0062] In one embodiment, the detection device applied to the safety protection device of the aerial work platform includes a displacement sensor provided at the telescopic end of the piston rod 5; the control device 15 applied to the safety protection device of the aerial work platform includes a second calculator for converting the displacement data detected by the displacement sensor into the descending speed of the piston rod 5, a second judge for judging whether the descending speed of the piston rod 5 is greater than the second safety value, and a second actuator for controlling the operation of the safety circuit 6 when the descending speed of the piston rod 5 is greater than the second safety value.

[0063] That is to say, in addition to setting the angle sensor 11 on the main boom 13, converting the angle detection signal to obtain the descending speed of the main boom 13, and judging whether the gravity drop valve 4 fails, a displacement sensor can also be set at the telescopic end of the piston rod 5. The second calculator converts the displacement data of the piston rod 5 into the descending speed of the piston rod 5, and the second judge judges whether the descending speed of the piston rod 5 is greater than the second safety value. If so, it indicates that the gravity drop valve 4 fails. At this time, the safety circuit 6 can be controlled to operate to supply oil to the cylinder barrel 1 of the lifting cylinder 12, reducing the retraction speed of the lifting cylinder 12, so that the descending speed of the main boom 13 reaches the first safety value, causing the main boom 13 to descend slowly.

[0064] It should be noted that the first calculator and the second calculator, the first judge and the second judge, the first actuator and the second actuator, the first safety value and the second safety value mentioned in the present invention. Herein, the first and the second are only for distinguishing different positions and there is no order of precedence.

[0065] In addition, it should be noted that the orientation or positional relationship indicated by "upper", "lower", etc. in the present utility model is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplifying the description and understanding, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0066] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. Any combination of all the embodiments provided by the present utility model falls within the protection scope of the present utility model, and will not be elaborated herein.

[0067] The above has introduced in detail the aerial work device provided by the present utility model and its application to the safety protection device of the aerial work platform. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A safety protection device for an aerial work platform, characterized in that: include: Cylinder barrel (1); A piston rod (5) which moves telescopically along the cylinder barrel (1); A gravity descent valve (4) having a self-locking function, wherein the gravity descent valve (4) is arranged on one side of the cylinder barrel (1); A working circuit (7) which is in communication with one side of the cylinder barrel (1) to supply oil to the oil chamber of the cylinder barrel (1), and the gravity drop valve (4) is used to control the supply and return of oil from the working circuit (7) to the oil chamber; A detection device, used to detect whether the gravity descent valve (4) fails; A safety circuit (6) connected to the other side of the cylinder barrel (1) for supplying oil to the oil chamber when the gravity descent valve (4) fails; A control device (15), the working circuit (7), the safety circuit (6), the detection device and the gravity descent valve (4) are all connected to the control device (15).

2. The safety protection device for aerial work platforms according to claim 1 is characterized in that: The safety circuit (6) is connected to the oil chamber via a one-way valve (2) and a connector (3).

3. The safety protection device for aerial work platforms according to claim 2 is characterized in that: The safety circuit (6) comprises an emergency power supply (61), an emergency power device (62) connected to the emergency power supply (61), and an emergency descending valve (63); the emergency power device (62) and the one-way valve (2) are connected via a safety hydraulic oil pipe (9); the safety hydraulic oil pipe (9) is provided with an emergency descending valve (63); and the emergency power device (62) is connected to the control device (15).

4. The safety protection device for aerial work platforms according to claim 1 is characterized in that: The working circuit (7) comprises a main power supply (71), an active pump (72) connected to the main power supply (71), and a main valve (73); the active pump (72) and the gravity descent valve (4) are connected via a working hydraulic oil pipe (8); the main valve (73) is provided on the working hydraulic oil pipe (8); and the active pump (72) and the control device (15) are connected.

5. A high-altitude working device, characterized in that: It includes the safety protection device applied to aerial work platforms as described in any one of claims 1 to 4 above.

6. The aerial work device according to claim 5, characterized in that: It also comprises a main arm (13), a working platform (14) arranged at one end of the main arm (13), and a fixing seat (10), the other end of the main arm (13) being hinged on the fixing seat (10), and the cylinder (1) applied to the aerial work platform safety protection device being arranged on the fixing seat (10).

7. The aerial work device according to claim 6, characterized in that: It also includes a chassis assembly for achieving movement, wherein the chassis assembly is arranged below the fixing seat (10).

8. The aerial work device according to claim 6, characterized in that: A guardrail is provided on the periphery of the working platform (14), and an anti-slip pad is provided on the bottom of the working platform (14).

9. The aerial work device according to any one of claims 6 to 8, characterized in that: The detection device applied to the aerial work platform safety protection device comprises an angle sensor (11) arranged on the main arm (13); The control device (15) applied to the aerial work platform safety protection device comprises a first calculator for converting the angle data detected by the angle sensor (11) into the descending speed of the main arm (13), a first judger for judging whether the descending speed of the main arm (13) is greater than a first safety value, and a first actuator, wherein the first actuator is used to control the operation of the safety circuit (6) when the descending speed of the main arm (13) is greater than the first safety value.

10. The aerial work device according to any one of claims 5 to 8, characterized in that: The detection device applied to the aerial work platform safety protection device comprises a displacement sensor arranged at the telescopic end of the piston rod (5); The control device (15) applied to the aerial work platform safety protection device comprises a second calculator for converting the displacement data detected by the displacement sensor into the descending speed of the piston rod (5), a second judgement device for judging whether the descending speed of the piston rod (5) is greater than a second safety value, and a second actuator, wherein the second actuator is used to control the operation of the safety circuit (6) when the descending speed of the piston rod (5) is greater than the second safety value.

Images