Platform power system of boom type aerial work platform

Abstract

The utility model provides a platform power system of a boom type aerial work platform, which comprises a platform power supply, a platform control system, a platform power unit assembly, a platform swing system, a platform leveling system and a fly boom lifting system, and the platform power unit assembly comprises a hydraulic oil tank, a driving motor, a gear pump, a transition valve block and a functional valve block. The driving motor is in power connection with the gear pump to provide power for the gear pump, the gear pump is communicated with the hydraulic oil tank through the oil suction pipe assembly, an oil outlet of the gear pump is communicated to the transition valve block, and total return oil of the system is connected to the oil return pipe assembly through the transition valve block and returns to the hydraulic oil tank. The platform power unit assembly has the advantages that the platform power unit assembly is integrated on the working platform, oil supply to the platform and fly jib actions is achieved, complex and lengthy boom oil conveying pipeline arrangement is omitted, the production cost is reduced, and meanwhile the maintenance time and cost of boom pipelines are reduced.

Description

Technical Field

[0001] The invention relates to a platform power system of a boom-type aerial work platform, belonging to the technical field of engineering machinery. Background Art

[0002] Boom aerial work platforms are mainly used in construction, steel structures, venues, shipyards and leasing. With the rapid development of my country's infrastructure construction, the demand and ownership of aerial work platforms are also growing rapidly. The mutual competition in the same industry and customers' increasingly high requirements for performance make aerial work platforms have high safety, high reliability, high intelligence, high controllability and energy saving requirements.

[0003] The platform movements of a boom-type aerial work platform generally include three movements: platform leveling, platform swinging, and boom up and down amplitude change. The current technical solution generally uses oil from the pump source off the vehicle, and connects to the platform control valve through a drag chain pipeline to provide pressure oil for the platform movement. The main problems are as follows: the platform-related movements are different from the main movements such as the main boom amplitude change and extension, that is, the speed difference of the prime mover required for the movement is large, resulting in a large waste of energy when the prime mover of the main pump performs the platform movement; the hydraulic pipeline connected in the middle is too long, resulting in a delay in the platform movement and slow response; the boom drag chain pipelines are numerous and long, and they are all moving parts in the main boom extension and retraction. Generally, the failure rate of the hydraulic hose will be greatly increased after 3 to 4 years of use, and maintenance is very difficult. In summary, the boom-type aerial work platform is currently in urgent need of a platform movement solution with high reliability, high operability and energy saving. Summary of the invention

[0004] Purpose of the invention: In view of the deficiencies in the prior art, the utility model provides a platform power system for a boom-type aerial work platform, which integrates the platform power unit assembly on the working platform to realize oil supply to the platform and the flying arm movement. Compared with the existing oil supply method of arranging the oil pipeline from the turntable to the platform, the complex and lengthy arrangement of the boom oil pipeline is eliminated, which reduces the production cost and also reduces the maintenance time and cost of the related boom pipelines.

[0005] Technical solution: A platform power system of a boom-type aerial work platform, including a platform power supply, a platform control system, a platform power unit assembly and an execution system, wherein the execution system includes a platform swing system, a platform leveling system and a flying arm lifting system.

[0006] The platform control system is connected to the platform power unit assembly via a platform power unit controller;

[0007] The platform power unit assembly includes a hydraulic oil tank, a drive motor, a gear pump, a transition valve block and a functional valve block. The drive motor is connected to the gear pump to provide power for the gear pump. The gear pump is connected to the hydraulic oil tank through an oil suction pipe assembly. The oil outlet of the gear pump is connected to the transition valve block. The transition valve block is plate-connected to the functional valve block. The total return oil of the system is connected to the return pipe assembly through the transition valve block and returns to the hydraulic oil tank.

[0008] The transition valve block comprises a two-position three-way solenoid valve and a main overflow valve, wherein the two-position three-way solenoid valve is connected to the oil outlet of the gear pump, and a first one-way valve is arranged between the two-position three-way solenoid valve and the main overflow valve;

[0009] The functional valve block includes a platform swing valve group, a platform leveling valve group and a fly arm lifting valve group, which are respectively connected to the platform swing system, the platform leveling system and the fly arm lifting system. The platform swing valve group, the platform leveling valve group and the fly arm lifting valve group are all connected to the two-position three-way solenoid valve through an oil circuit, and the oil return ports are all connected to the hydraulic oil tank through an oil return pipe assembly.

[0010] The utility model realizes the oil supply for the platform and the flying arm movement by integrating the platform power unit assembly on the working platform. Compared with the existing oil supply method of arranging the oil pipeline from the turntable to the platform, the complicated and lengthy arm oil pipeline arrangement is omitted, the production cost is reduced, and the maintenance time and cost of the arm pipeline are also reduced. Since the arm has a large range of activities when used on the aerial work platform, it is easy to collide. Omitting the arm pipeline reduces the possibility of failure and damage of the hydraulic system, improves the working safety and stability of the vehicle, and further improves the economic benefits of the vehicle.

[0011] By integrating multiple valve groups into transition valve blocks and functional valve blocks, and installing them between the gear pump and the hydraulic oil tank, a complete oil delivery and return channel is realized to meet the oil needs of platform swing, platform leveling and flying arm leveling; the platform is equipped with a separate drive motor and gear pump, which is not affected by the power of the turntable power unit and can work independently to avoid power waste caused by power demand gap, effectively saving energy.

[0012] Optimum option, in order to achieve stable swinging motion of the working platform,

[0013] The platform swing system includes a platform swing cylinder;

[0014] The platform swing valve group includes a swing control solenoid valve, a swing relief valve arranged on the feedback oil circuit of the swing control solenoid valve and connected to the hydraulic oil tank, and a swing priority proportional valve arranged between the oil outlet of the transition valve block and the swing control solenoid valve;

[0015] The swing priority proportional valve comprises a swing end oil outlet, a swing end control oil chamber, a non-swing end oil outlet and a non-swing end control oil chamber, and a preload spring is arranged in the swing end control oil chamber;

[0016] A first damping hole is provided on the feedback oil circuit between the swing end oil outlet of the swing priority proportional valve and the non-swing end control oil chamber, and a second damping hole and a third damping hole are provided in series on the oil circuit between the swing end control oil chamber of the swing priority proportional valve and the feedback oil port of the swing control solenoid valve;

[0017] The swing relief valve is arranged in the oil path between the second damping hole and the third damping hole;

[0018] An adjustable damping is arranged in series between the swing control solenoid valve and the swing priority proportional valve.

[0019] When the operating platform swings, the flow rate required for the platform swing is very small, only about 0.5L / min, and the platform swing is prone to start-up delay. By setting the swing priority proportional valve, it is possible to give priority to oil supply to the platform swing when the swing control solenoid valve is in the working position, ensuring the rapid response of the platform swing when operating with other platform actions.

[0020] An adjustable damper is also connected in series between the swing control solenoid valve and the swing priority proportional valve. By adjusting the size of the adjustable damper, the hydraulic oil flow in the oil circuit where it is located can be controlled, thereby controlling the swing speed of the platform.

[0021] Optimum option, in order to achieve stable lifting action of the flying arm,

[0022] The fly boom lifting system comprises a fly boom luffing oil cylinder and a fly boom balancing valve connected to the fly boom luffing oil cylinder in a plate-type manner;

[0023] The fly boom lifting valve group includes a fly boom lifting electromagnetic proportional valve and a second pressure compensation valve arranged on the oil inlet pipeline of the fly boom lifting electromagnetic proportional valve;

[0024] The fly arm lifting electromagnetic proportional valve is connected to the fly arm balance valve to control the movement of the fly arm luffing cylinder.

[0025] When the fly boom is lifted, the proportional solenoid of the fly boom lifting solenoid proportional valve is energized, and one signal oil circuit is connected to the spring chamber of the second pressure compensation valve to ensure that the pressure difference before and after the proportional valve is consistent. The lifting speed has nothing to do with the load and is only related to the opening of the fly boom lifting solenoid proportional valve. The other circuit is connected to the spring chamber of the main compensation valve through the fourth one-way valve, so that the pressure oil no longer unloads through the main compensation valve, but supplies oil for the lifting of the fly boom. The oil in the small chamber of the fly boom luffing cylinder returns to the hydraulic oil tank.

[0026] Optimized option, in order to achieve stable platform leveling action,

[0027] The platform leveling system comprises a leveling cylinder and a leveling balancing valve connected to the leveling cylinder in a plate-type manner;

[0028] The platform leveling valve group includes a leveling control solenoid valve, a shuttle valve connected between two oil outlets of the leveling control solenoid valve, and a first pressure compensation valve arranged on the oil inlet pipeline of the leveling control solenoid valve, and a second one-way valve is arranged on the oil line between the oil return port of the leveling control solenoid valve and the oil return pipe assembly;

[0029] The leveling control solenoid valve is connected to the leveling balance valve to control the movement of the leveling cylinder.

[0030] When the main arm is luffing and lowering, the motor of the platform power unit assembly also works. At this time, the two-position three-way solenoid valve is not energized, and the gear pump supplies oil to the functional valve block. The platform control system adjusts the energization of the proportional solenoid Y4A and the proportional solenoid Y4B on the leveling control solenoid valve according to the feedback of the inclination sensor, and supplies oil to the leveling cylinder, so that the working platform remains level with the ground when the main arm is luffing and lowering. When the leveling control solenoid valve is energized, the oil outlet of the shuttle valve is signal oil, one of which is connected to the spring chamber of the first pressure compensation valve to ensure that the pressure difference before and after the proportional valve is consistent, and the lifting speed is independent of the load and only related to the valve opening; the other is connected to the spring chamber of the main compensation valve through the second one-way valve, so that the pressure oil is no longer unloaded through the main compensation valve, but supplies oil to the leveling cylinder.

[0031] The preferred option is to return the excess pressure oil to the hydraulic oil tank and realize the stable supply of hydraulic oil for platform leveling and fly arm lifting;

[0032] A main compensation valve is connected to the oil circuit between the oil outlet of the swing priority proportional valve and the fly arm lifting valve group, and the main compensation valve is connected to the hydraulic oil tank through the return oil pipe assembly;

[0033] The oil outlet of the shuttle valve is connected to the spring chamber of the main compensation valve through a third one-way valve;

[0034] The oil outlet of the fly arm lifting electromagnetic proportional valve is connected to the spring chamber of the main compensation valve through the fourth one-way valve.

[0035] When the platform leveling and the flying arm are not moving and the motor is rotating, the main compensation valve does not receive the oil circuit signal. At this time, the oil inlet pipeline in front of the platform leveling valve group and the flying arm lifting valve group is connected to the hydraulic oil tank through the main compensation valve and the return oil pipe assembly, and the hydraulic oil is pumped out from the gear pump and returns to the oil tank; when the platform or the flying arm moves, the oil outlet of the shuttle valve or the flying arm lifting solenoid proportional valve is connected to the spring chamber of the main compensation valve, and the main compensation valve receives the oil circuit signal and switches to the blocking position, cutting off the connection with the return oil pipe assembly, so that the hydraulic oil can supply oil for the platform leveling and flying arm lifting actions to achieve stable action.

[0036] Optimum option, in order to achieve potential energy recovery,

[0037] A two-way check solenoid valve is arranged on the oil circuit between the fly arm balancing valve and the oil return pipe assembly, and the two-way check solenoid valve is in a flow state when power is not supplied.

[0038] When the flying boom is lowered alone, energy recovery can be carried out. The platform control system controls the proportional solenoid of the flying boom lifting solenoid proportional valve to be energized, the two-position three-way solenoid valve to be energized, and the two-way check solenoid valve to be energized. When the flying boom is lowered, the oil in the large chamber of the flying boom luffing cylinder cannot return to the hydraulic oil tank through the two-way check solenoid valve, and can only flow to the oil outlet of the gear pump through the two-position three-way solenoid valve; at this time, the working mode of the gear pump is switched to the motor, and the gear pump drives the motor to reverse and generate electricity, and the recovered electric energy is transmitted to the platform power supply through the platform power unit controller.

[0039] If the platform is in the process of combining other actions with the lowering of the flying arm, energy recovery cannot be performed because the gear pump still needs to provide high-pressure oil. The two-position three-way solenoid valve and the two-way check solenoid valve shall not be energized.

[0040] The preferred option is to provide emergency operation when the power source fails in order to ensure the safety of the platform;

[0041] A manual pump is provided between the oil outlet of the oil suction pipe assembly and the oil outlet of the two-position three-way solenoid valve when power is not supplied. The oil inlet of the manual pump is connected to the oil suction pipe assembly through the fifth one-way valve to suck oil from the hydraulic oil tank; the oil outlet of the manual pump passes through the sixth one-way valve and converges with the oil port of the first one-way valve; the flying arm balancing valve is also provided with an emergency pull wire, which is extended and installed on the operating platform.

[0042] When the power source fails, the manual pump can be operated to provide pressure oil while operating normally; the jib is lowered by its own weight, so normal emergency operation is required, and there is no need to operate the manual pump to provide pressure oil. When the entire electronic control system fails, the jib lifting electromagnetic proportional valve is also provided with an emergency pull wire, which is extended and installed on the operating platform, and the emergency operation of the jib can be realized by operating the emergency pull wire.

[0043] Optimum option, in order to achieve flow control of the oil circuit,

[0044] A flow control valve is also provided on the oil circuit between the spring chamber of the main compensation valve and the oil return pipe assembly.

[0045] Optimal option, in order to achieve energy supply to the platform power supply to ensure the continuous operation of the platform;

[0046] It also includes a main power supply, a main power supply charger and a turntable control system, wherein the output end of the main power supply is connected to the turntable control system and the platform control system via a DC-DC converter, the main power supply is indirectly connected to the platform power supply charger via a charging wake-up relay, and the main power supply charger is also indirectly connected to the platform power supply charger via a charging wake-up relay, and both the main power supply and the main power supply charger charge the platform power supply via the platform power supply charger;

[0047] The platform power unit assembly is indirectly connected to the platform power unit controller via a contactor and a circuit breaker; the turntable control system, the platform control system and the platform power unit controller are connected and communicated via a CAN line.

[0048] The charging wake-up relay includes a normally closed contact and a normally open contact. The charging wake-up relay is energized after the turntable control system is powered on. After energization, the normally open contact is energized to form a path, and the main power supply outputs current to the platform power charger through the charging wake-up relay, and the platform power supply is energized to enter the charging state. The main power charger is connected to the external power grid to be powered, and the main power supply enters the charging state; when the main power supply of the vehicle is charging, the main power charger outputs current to the platform power charger through the normally closed contact of the charging wake-up relay, and the platform power supply is energized to enter the charging state.

[0049] Optimize the level of the working platform to better monitor the level of the working platform.

[0050] It also includes an inclination sensor installed on the platform swing cylinder, and the inclination sensor is connected to the platform power unit controller signal.

[0051] Beneficial effects: The utility model realizes the oil supply for the platform and the flying arm movement by integrating the platform power unit assembly on the working platform. Compared with the existing oil supply method of arranging the oil pipeline from the turntable to the platform, the complicated and lengthy arm oil pipeline arrangement is omitted, the production cost is reduced, and the maintenance time and cost of the arm pipeline are also reduced. Since the arm has a large range of activities when used on the aerial work platform, it is easy to collide. Omitting the arm pipeline reduces the possibility of failure and damage to the hydraulic system, improves the working safety and stability of the vehicle, and further improves the economic benefits of the vehicle.

[0052] By integrating multiple valve groups into transition valve blocks and functional valve blocks, and installing them between the gear pump and the hydraulic oil tank, a complete oil delivery and return channel is realized to meet the oil needs of platform swing, platform leveling and flying arm leveling; the platform is equipped with a separate drive motor and gear pump, which is not affected by the power of the turntable power unit and can work independently to avoid power waste caused by power demand gap, effectively saving energy.

[0053] The hydraulic oil source is arranged on the platform, close to the actuator, and the platform responds quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0055] Figure 1 This is a structural diagram of the utility model platform power unit assembly integrated in the working platform.

[0056] Figure 2 This is a structural diagram of the platform power unit assembly of the utility model.

[0057] Figure 3 This is the hydraulic principle diagram of the platform power unit assembly and execution system of the utility model.

[0058] Figure 4 This is the hydraulic principle diagram of the platform power element assembly of the utility model.

[0059] Figure 5 This is the hydraulic principle diagram of the swing priority proportional valve of the utility model.

[0060] Figure 6 This is the hydraulic principle diagram of the fly arm balancing valve of the utility model.

[0061] Figure 7 This is the whole machine structure diagram of the utility model. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, 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, and therefore cannot be understood as a limitation on the present invention.

[0064] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0065] like Figures 1 to 4 As shown, a platform power system of a boom-type aerial work platform includes a platform power supply 1, a platform control system 2, a platform power unit assembly 3 and an execution system 4, wherein the execution system 4 includes a platform swing system 41, a platform leveling system 42 and a flying arm lifting system 43.

[0066] The platform control system 2 is connected to the platform power unit assembly 3 via the platform power unit controller;

[0067] The platform power unit assembly 3 includes a hydraulic oil tank 31, a drive motor 32, a gear pump 33, a transition valve block 34 and a functional valve block 35. The drive motor 32 is connected to the gear pump 33 to provide power for the gear pump 33. The gear pump 33 is connected to the hydraulic oil tank 31 through an oil suction pipe assembly 36. The oil outlet of the gear pump 33 is connected to the transition valve block 34. The transition valve block 34 is plate-connected to the functional valve block 35. The total return oil of the system is connected to the return oil pipe assembly 37 through the transition valve block 34 and returns to the hydraulic oil tank 31.

[0068] The transition valve block 34 includes a two-position three-way solenoid valve 341 and a main relief valve 342. The two-position three-way solenoid valve 341 is connected to the oil outlet of the gear pump 33. A first one-way valve 343 is provided between the two-position three-way solenoid valve 341 and the main relief valve 342. The 341 is a two-position three-way solenoid valve.

[0069] The functional valve block 35 includes a platform swing valve group, a platform leveling valve group and a fly arm lifting valve group, which are respectively connected to the platform swing system 41, the platform leveling system 42 and the fly arm lifting system 43. The platform swing valve group, the platform leveling valve group and the fly arm lifting valve group are all connected to the two-position three-way solenoid valve 341 through an oil circuit, and the return oil ports are all connected to the hydraulic oil tank 31 through the return oil pipe assembly 37.

[0070] The utility model realizes the oil supply for the platform and the flying arm movement by integrating the platform power unit assembly 3 on the working platform. Compared with the existing oil supply method of arranging the oil pipeline from the turntable to the platform, the complicated and lengthy arm oil pipeline arrangement is omitted, the production cost is reduced, and the maintenance time and cost of the arm pipeline are also reduced. Since the arm has a large range of activities when used on the aerial work platform, it is easy to collide. Omitting the arm pipeline reduces the possibility of failure and damage of the hydraulic system, improves the working safety and stability of the vehicle, and further improves the economic benefits of the vehicle.

[0071] By integrating multiple valve groups into a transition valve block 34 and a functional valve block 35, and installing them between the gear pump 33 and the hydraulic oil tank, a complete oil delivery and oil return channel is realized to meet the oil needs of platform swing, platform leveling and flying arm leveling; the platform is independently equipped with a drive motor 32 and a gear pump 33, which are not affected by the power of the turntable power unit and can work independently to avoid power waste caused by power demand gap, thereby effectively saving energy.

[0072] like Figure 3 and 5 As shown, in order to achieve stable swinging motion of the working platform,

[0073] The platform swing system 41 includes a platform swing cylinder 411; the PR1 and PR2 oil ports of the platform power unit assembly 3 are connected to the V1 and V2 ports of the platform swing cylinder 411 respectively;

[0074] The platform swing valve group includes a swing control solenoid valve 351, a swing relief valve 352 arranged on the feedback oil path of the swing control solenoid valve 351 and connected to the hydraulic oil tank 31, and a swing priority proportional valve 353 arranged between the oil outlet of the transition valve block 34 and the swing control solenoid valve 351;

[0075] The swing priority proportional valve 353 includes a swing end oil outlet 3531, a swing end control oil chamber 3532, a non-swing end oil outlet 3533 and a non-swing end control oil chamber 3534. A preload spring 3535 is provided in the swing end control oil chamber 3532.

[0076] A first damping hole 3536 is provided on the feedback oil circuit between the swing end oil outlet 3531 of the swing priority proportional valve 353 and the non-swing end control oil chamber 3534, and a second damping hole 3537 and a third damping hole 3538 connected in series are provided on the oil circuit between the swing end control oil chamber 3532 of the swing priority proportional valve 353 and the feedback oil port of the swing control solenoid valve 351;

[0077] The swing relief valve 352 is arranged in the oil path between the second damping hole 3537 and the third damping hole 3538;

[0078] An adjustable damper 354 is arranged in series between the swing control solenoid valve 351 and the swing priority proportional valve 353 .

[0079] When the operating platform swings, the flow rate required for the platform swing is very small, only about 0.5L / min, and the platform swing is prone to start-up delay. By setting the swing priority proportional valve 353, it is possible to give priority to oil supply to the platform swing when the swing control solenoid valve 351 is in the working position, thereby ensuring the rapid response of the platform swing when operating together with other platform actions.

[0080] An adjustable damper 354 is also connected in series between the swing control solenoid valve 351 and the swing priority proportional valve 353. By adjusting the size of the adjustable damper 354, the hydraulic oil flow rate of the oil circuit where it is located can be controlled, thereby controlling the swing speed of the platform.

[0081] like Figure 3 and 6 As shown, in order to achieve stable lifting action of the flying arm,

[0082] The flying boom lifting system 43 includes a flying boom luffing cylinder 431 and a flying boom balancing valve 432 which is plate-connected to the flying boom luffing cylinder 431; the PL1 and PL2 oil ports of the platform power unit assembly 3 are respectively connected to the V5 and V6 ports of the flying boom balancing valve 432, and the C3 and C4 oil ports of the flying boom balancing valve 432 are respectively connected to the large chamber and small chamber of the flying boom luffing cylinder.

[0083] The fly boom lifting valve group includes a fly boom lifting solenoid proportional valve 355 and a second pressure compensation valve 356 arranged on the oil inlet pipeline of the fly boom lifting solenoid proportional valve 355;

[0084] The fly arm lifting electromagnetic proportional valve 355 is connected to the fly arm balance valve 432 to control the movement of the fly arm luffing cylinder 431.

[0085] When the flying arm is lifted, the proportional solenoid of the flying arm lifting solenoid proportional valve 355 is energized, and one signal oil circuit is connected to the spring chamber of the second pressure compensation valve 356 to ensure that the pressure difference before and after the proportional valve is consistent. The lifting speed has nothing to do with the load and is only related to the opening of the flying arm lifting solenoid proportional valve 355. The other circuit is connected to the spring chamber of the main compensation valve 344 through the fourth one-way valve 346, so that the pressure oil no longer unloads through the main compensation valve 344, but supplies oil for the lifting of the flying arm. The oil in the small chamber of the flying arm variable amplitude cylinder 431 returns to the hydraulic oil tank.

[0086] like Figure 3 and 4 As shown, in order to achieve stable platform leveling action,

[0087] The platform leveling system 42 includes a leveling cylinder 421 and a leveling balancing valve 422 connected to the leveling cylinder 421 in a plate-type manner; the PL1 and PL2 oil ports of the platform power unit assembly 3 are respectively connected to the V3 and V4 ports of the leveling balancing valve 422, and the C1 and C2 oil ports of the leveling balancing valve 422 are respectively connected to the large cavity and the small cavity of the leveling cylinder 421;

[0088] The platform leveling valve group includes a leveling control solenoid valve 357, a shuttle valve 358 connected between two oil outlets of the leveling control solenoid valve 357, and a first pressure compensation valve 359 arranged on the oil inlet pipeline of the leveling control solenoid valve 357, and a second one-way valve 3510 is arranged on the oil line between the oil return port of the leveling control solenoid valve 357 and the oil return pipe assembly 37;

[0089] The leveling control solenoid valve 357 is connected to the leveling balance valve 422 to control the movement of the leveling cylinder 421 .

[0090] When the main arm is raised and lowered, the motor of the platform power unit assembly 3 also works. At this time, the two-position three-way solenoid valve 341 is not energized, and the gear pump 33 supplies oil to the functional valve block 35. The platform control system 2 adjusts the energization of the proportional solenoid Y4A and the proportional solenoid Y4B on the leveling control solenoid valve 357 according to the feedback of the inclination sensor 13, and supplies oil to the leveling cylinder, so that the working platform remains level with the ground when the main arm is raised and lowered. When the leveling control solenoid valve 357 is energized, the oil outlet of the shuttle valve 358 is signal oil, one of which is connected to the spring chamber of the first pressure compensation valve 359 to ensure that the pressure difference before and after the proportional valve is consistent, and the lifting speed is independent of the load and only related to the valve opening; the other is connected to the spring chamber of the main compensation valve 344 through the second one-way valve 3510, so that the pressure oil is no longer unloaded through the main compensation valve 344, but supplies oil to the leveling cylinder.

[0091] In order to return excess pressure oil to the oil tank and realize the stable supply of hydraulic oil for platform leveling and boom lifting;

[0092] A main compensation valve 344 is connected to the oil circuit between the oil outlet of the swing priority proportional valve 353 and the fly arm lifting valve group, and the main compensation valve 344 is connected to the hydraulic oil tank 31 through the return oil pipe assembly 37;

[0093] The oil outlet of the shuttle valve 358 is connected to the spring chamber of the main compensation valve 344 through the third one-way valve 345;

[0094] The oil outlet of the fly boom lifting electromagnetic proportional valve 355 is connected to the spring chamber of the main compensation valve 344 through the fourth one-way valve 346 .

[0095] When the platform leveling and the flying arm are not moving and the motor is rotating, the main compensation valve 344 does not receive the oil circuit signal. At this time, the oil inlet pipeline in front of the platform leveling valve group and the flying arm lifting valve group is connected to the hydraulic oil tank through the main compensation valve 344 and the return oil pipe assembly, and the hydraulic oil is pumped out from the gear pump 33 and returns to the oil tank; when the platform or the flying arm moves, the oil outlet of the shuttle valve 358 or the flying arm lifting solenoid proportional valve 355 is connected to the spring chamber of the main compensation valve 344, and the main compensation valve 344 receives the oil circuit signal and switches to the blocking position, cutting off the connection with the return oil pipe assembly, so that the hydraulic oil can supply oil for the platform leveling and flying arm lifting actions, thereby achieving stable action.

[0096] In order to realize potential energy recovery,

[0097] A two-way check solenoid valve 347 is provided on the oil circuit between the fly arm balance valve 432 and the oil return pipe assembly 37 , and the two-way check solenoid valve 347 is in a flow state when power is not supplied.

[0098] When the flying boom is lowered by operating alone, energy recovery can be performed, and the platform control system 2 controls the proportional solenoid of the flying boom lifting solenoid proportional valve 355 to be energized, the two-position three-way solenoid valve 341 to be energized, and the two-way check solenoid valve 347 to be energized, so that when the flying boom is lowered, the oil in the large chamber of the flying boom variable cylinder 431 cannot return to the hydraulic oil tank through the two-way check solenoid valve, and can only flow to the oil outlet of the gear pump 33 through the two-position three-way solenoid valve; at this time, the working mode of the gear pump 33 is switched to the motor, and the gear pump 33 drives the motor to reverse and generate electricity, and the recovered electric energy is transmitted to the platform power supply 1 through the platform power unit controller.

[0099] If the platform is combined with the lowering of the flying arm in other actions, since the gear pump 33 still needs to provide high-pressure oil, energy recovery cannot be performed at this time, and the two-position three-way solenoid valve 341 and the two-way check solenoid valve 347 shall not be energized.

[0100] In order to ensure the safety of platform operation, it can provide emergency operation when the power source fails;

[0101] A manual pump 38 is provided between the oil outlet of the oil suction pipe assembly 36 and the oil outlet of the two-position three-way solenoid valve 341 when power is off. The oil inlet of the manual pump 38 is connected to the oil suction pipe assembly 36 through the fifth one-way valve 381 to suck oil from the hydraulic oil tank 31; the oil outlet of the manual pump 38 passes through the sixth one-way valve 382 and merges with the oil port of the first one-way valve 343; the flying arm balancing valve 432 is also provided with an emergency pull line, which is extended and installed on the operating platform.

[0102] When the power source fails, the manual pump 38 can be operated to provide pressure oil while operating normally; the boom is lowered by its own weight, so normal emergency operation is required, and the manual pump 38 does not need to be operated to provide pressure oil. When the entire electric control system fails, the boom lifting electromagnetic proportional valve 355 is also provided with an emergency pull line, which is extended and installed on the operating platform, and the emergency operation of the boom lowering can be realized by operating the emergency pull line.

[0103] In order to achieve flow control of the oil circuit,

[0104] A flow control valve 39 is also provided on the oil circuit between the spring chamber of the main compensation valve 344 and the oil return pipe assembly 37 .

[0105] The two-position three-way solenoid valve 341 includes a switch solenoid Y1, which is connected to the platform control system 2; the two-way check solenoid valve 347 includes a switch solenoid Y2, which is connected to the platform control system 2; the swing control solenoid valve 351 includes a switch solenoid Y3A and a switch solenoid Y3B, which are connected to the platform control system 2; the leveling control solenoid valve 357 includes a proportional solenoid Y4A and a proportional solenoid Y4B, which are connected to the platform control system 2; the flying arm lifting solenoid valve 355 includes a proportional solenoid Y5, which is connected to the platform control system 2; the flying arm balancing valve 432 includes a proportional solenoid Y6, which is connected to the platform control system 2.

[0106] In order to achieve the energy supply of the platform power supply to ensure the continuous operation of the platform; such as Figure 7 As shown,

[0107] It also includes a main power supply 5, a main power supply charger 6 and a turntable control system 7. The output end of the main power supply 5 is connected to the turntable control system 7 and the platform control system 2 through a DC-DC converter 8. The main power supply 5 is indirectly connected to the platform power supply charger 10 through a charging wake-up relay 9. At the same time, the main power supply charger 6 is also indirectly connected to the platform power supply charger 10 through the charging wake-up relay 9. The main power supply 5 and the main power supply charger 6 both charge the platform power supply 1 through the platform power supply charger 10.

[0108] The platform power unit assembly 3 is indirectly connected to the platform power unit controller via a contactor 11 and a circuit breaker 12; the turntable control system 7, the platform control system 2 and the platform power unit controller are connected and communicated via a CAN line.

[0109] The charging wake-up relay 9 includes a normally closed contact and a normally open contact. The charging wake-up relay 9 is energized after the turntable control system 7 is powered on. After being energized, the normally open contact is energized to form a path, and the main power supply 5 outputs current to the platform power charger 10 through the charging wake-up relay 9, and the platform power supply 1 is energized and enters the charging state. The main power charger 6 is connected to the external power grid to be powered, and the main power supply 5 enters the charging state; when the vehicle main power supply 5 is charging, the main power charger 6 outputs current through the normally closed contact of the charging wake-up relay 9 to the platform power charger 10, and the platform power supply 1 is energized and enters the charging state.

[0110] In order to better monitor the horizontal status of the working platform, such as Figure 1 As shown,

[0111] It also includes an inclination sensor 13 installed on the platform swing cylinder 411, and the inclination sensor 13 is connected to the platform power unit controller signal.

[0112] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0113] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A platform power system for a boom-type aerial work platform, comprising a platform power supply (1), a platform control system (2), a platform power unit assembly (3) and an execution system (4), wherein the execution system (4) comprises a platform swing system (41), a platform leveling system (42) and a flying arm lifting system (43), characterized in that: The platform control system (2) is connected to the platform power unit assembly (3) via a platform power unit controller; The platform power unit assembly (3) comprises a hydraulic oil tank (31), a drive motor (32), a gear pump (33), a transition valve block (34) and a functional valve block (35); the drive motor (32) is connected to the gear pump (33) in a power connection to provide power for the gear pump (33); the gear pump (33) is connected to the hydraulic oil tank (31) via an oil suction pipe assembly (36); the oil outlet of the gear pump (33) is connected to the transition valve block (34); the transition valve block (34) and the functional valve block (35) are plate-connected; the total return oil of the system is connected to the return oil pipe assembly (37) through the transition valve block (34) and returns to the hydraulic oil tank (31); The transition valve block (34) comprises a two-position three-way solenoid valve (341) and a main overflow valve (342); the two-position three-way solenoid valve (341) is connected to the oil outlet of the gear pump (33); a first one-way valve (343) is provided between the two-position three-way solenoid valve (341) and the main overflow valve (342); The functional valve block (35) comprises a platform swing valve group, a platform leveling valve group and a fly arm lifting valve group which are respectively connected to the platform swing system (41), the platform leveling system (42) and the fly arm lifting system (43); the platform swing valve group, the platform leveling valve group and the fly arm lifting valve group are all connected to the two-position three-way solenoid valve (341) through an oil circuit, and the oil return ports are all connected to the hydraulic oil tank (31) through an oil return pipe assembly (37).

2. The platform power system of the boom-type aerial work platform according to claim 1 is characterized in that: The platform swing system (41) comprises a platform swing cylinder (411); The platform swing valve group comprises a swing control solenoid valve (351), a swing relief valve (352) arranged on a feedback oil circuit of the swing control solenoid valve (351) and connected to the hydraulic oil tank (31), and a swing priority proportional valve (353) arranged between an oil outlet of a transition valve block (34) and the swing control solenoid valve (351); The swing priority proportional valve (353) comprises a swing end oil outlet (3531), a swing end control oil chamber (3532), a non-swing end oil outlet (3533) and a non-swing end control oil chamber (3534); a preload spring (3535) is provided in the swing end control oil chamber (3532); A first damping hole (3536) is provided on the feedback oil circuit between the swing end oil outlet (3531) of the swing priority proportional valve (353) and the non-swing end control oil chamber (3534), and a second damping hole (3537) and a third damping hole (3538) connected in series are provided on the oil circuit between the swing end control oil chamber (3532) of the swing priority proportional valve (353) and the feedback oil port of the swing control solenoid valve (351); The swing relief valve (352) is arranged on the oil path between the second damping hole (3537) and the third damping hole (3538); An adjustable damper (354) is arranged in series between the swing control solenoid valve (351) and the swing priority proportional valve (353).

3. The platform power system of the boom-type aerial work platform according to claim 2 is characterized in that: The fly boom lifting system (43) comprises a fly boom luffing oil cylinder (431) and a fly boom balancing valve (432) connected to the fly boom luffing oil cylinder (431) in a plate-type manner; The fly boom lifting valve assembly comprises a fly boom lifting electromagnetic proportional valve (355) and a second pressure compensation valve (356) arranged on the oil inlet pipeline of the fly boom lifting electromagnetic proportional valve (355); The fly arm lifting electromagnetic proportional valve (355) is connected to the fly arm balance valve (432) to control the movement of the fly arm luffing cylinder (431).

4. The platform power system of the boom-type aerial work platform according to claim 3 is characterized in that: The platform leveling system (42) comprises a leveling oil cylinder (421) and a leveling balancing valve (422) connected to the leveling oil cylinder (421) in a plate-type manner; The platform leveling valve assembly comprises a leveling control solenoid valve (357), a shuttle valve (358) connected between two oil outlets of the leveling control solenoid valve (357), and a first pressure compensation valve (359) arranged on the oil inlet pipeline of the leveling control solenoid valve (357); a second check valve (3510) is arranged on the oil line between the oil return port of the leveling control solenoid valve (357) and the oil return pipe assembly (37); The leveling control solenoid valve (357) is connected to the leveling balance valve (422) to control the movement of the leveling cylinder (421).

5. The platform power system of the boom-type aerial work platform according to claim 4, characterized in that: A main compensation valve (344) is connected to the oil circuit between the oil outlet of the swing priority proportional valve (353) and the fly arm lifting valve assembly, and the main compensation valve (344) is connected to the hydraulic oil tank (31) via an oil return pipe assembly (37); The oil outlet of the shuttle valve (358) is connected to the spring chamber of the main compensation valve (344) through the third one-way valve (345); The oil outlet of the fly boom lifting electromagnetic proportional valve (355) is connected to the spring chamber of the main compensation valve (344) through the fourth one-way valve (346).

6. The platform power system of the boom-type aerial work platform according to claim 3, characterized in that: A two-way check solenoid valve (347) is provided on the oil circuit between the fly arm balancing valve (432) and the oil return pipe assembly (37). The two-way check solenoid valve (347) is in a flow state when power is not supplied.

7. The platform power system of the boom-type aerial work platform according to claim 3, characterized in that: A manual pump (38) is provided between the oil outlet of the oil suction pipe assembly (36) and the oil outlet of the two-position three-way solenoid valve (341) when power is off. The oil inlet of the manual pump (38) is connected to the oil suction pipe assembly (36) via a fifth one-way valve (381) to suck oil from the hydraulic oil tank (31); the oil outlet of the manual pump (38) passes through a sixth one-way valve (382) and converges with the oil outlet of the first one-way valve (343); the fly arm balancing valve (432) is also provided with an emergency pull line, which is extended and installed on the operating platform.

8. The platform power system of the boom-type aerial work platform according to claim 5, characterized in that: A flow control valve (39) is also provided on the oil circuit between the spring chamber of the main compensation valve (344) and the oil return pipe assembly (37).

9. The platform power system of the boom-type aerial work platform according to claim 1, characterized in that: It also includes a main power supply (5), a main power supply charger (6) and a turntable control system (7); the output end of the main power supply (5) is connected to the turntable control system (7) and the platform control system (2) via a DC-DC converter (8); the main power supply (5) is indirectly connected to the platform power supply charger (10) via a charging wake-up relay (9); and the main power supply charger (6) is also indirectly connected to the platform power supply charger (10) via the charging wake-up relay (9); the main power supply (5) and the main power supply charger (6) both charge the platform power supply (1) via the platform power supply charger (10); The platform power unit assembly (3) is indirectly connected to the platform power unit controller via a contactor (11) and a circuit breaker (12); the turntable control system (7), the platform control system (2) and the platform power unit controller are connected and communicated via a CAN line.

10. The platform power system of the boom-type aerial work platform according to claim 9, characterized in that: It also includes an inclination sensor (13) installed on the platform swing cylinder (411), and the inclination sensor (13) is connected to the platform power unit controller signal.

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