Crane power system, control method and tyre crane

Abstract

The application relates to the field of engineering machinery and discloses a crane power system, a control method and a tire crane. The crane power system comprises a superstructure hydraulic system and a brake hydraulic system, and further comprises an engine, a gearbox, a main oil pump, a power take-off device, a power take-off cylinder and an oil cylinder control system. The gearbox is connected with the engine. The main oil pump is used for pumping hydraulic oil of a hydraulic oil source to the superstructure hydraulic system. The power take-off device is connected with the gearbox and the main oil pump. The power take-off device can be switched between a disconnected state and a connected state under the drive of the power take-off cylinder. The oil cylinder control system comprises an oil inlet oil circuit. An oil outlet end of the oil inlet oil circuit is connected with the power take-off cylinder. The oil inlet end is connected with the brake hydraulic system. The application effectively reduces the fuel consumption of the crane during driving, improves the driving capacity of the crane and the service life of the main oil pump, and avoids the problem that the engine is difficult to start when the ambient temperature is relatively low.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery, specifically relating to a crane power system, control method, and tire crane. Background Technology

[0002] In existing crane power systems, the main hydraulic pump, which delivers hydraulic oil to the upper structure's hydraulic system, is directly connected to the gearbox. When the crane is in motion, the upper structure doesn't need to operate, but because the main pump is constantly connected to the gearbox, it continuously receives power from the gearbox and remains operational. This results in high fuel consumption during crane operation, with the engine's output power being consumed by the main pump, leading to poor travel capability. It also increases wear on the main pump, shortening its lifespan. Furthermore, at low ambient temperatures, the hydraulic oil viscosity is higher. During engine startup, the main pump consumes some of the engine's output power, increasing the starting load and making engine starting more difficult. Summary of the Invention

[0003] In view of the above-mentioned deficiencies or defects in the prior art, the present invention provides a crane power system, control method and tire crane, aiming to solve the technical problems of high fuel consumption, poor driving ability, short service life of main oil pump and difficulty in starting engine when the ambient temperature is low in existing cranes.

[0004] To achieve the above objectives, the present invention provides a crane power system, the crane power system including an upper structure hydraulic system and a braking hydraulic system, and the crane power system further includes:

[0005] engine;

[0006] A gearbox, wherein the power input end of the gearbox is connected to the power output end of the engine;

[0007] The main oil pump is used to pump hydraulic oil from the hydraulic oil source to the upper vehicle hydraulic system;

[0008] The power take-off (PTO) and the PTO cylinder are provided. The power input terminal of the PTO is connected to the power output terminal of the gearbox, and the power output terminal of the PTO is connected to the power input terminal of the main oil pump. The PTO can switch between a disconnected state and a connected state under the drive of the PTO cylinder.

[0009] The hydraulic cylinder control system includes an oil inlet circuit, the oil outlet of which is connected to the power take-off cylinder, and the oil inlet of which is connected to the brake hydraulic system. The oil inlet circuit can introduce high-pressure hydraulic oil from the brake hydraulic system into the power take-off cylinder to drive the power take-off cylinder.

[0010] Optionally, the cylinder control system further includes a reversing valve and a return oil circuit. The reversing valve has a first working port, a second working port, an inlet port, and a return oil port. The first working port is connected to the rodless chamber of the power take-off cylinder, the second working port is connected to the rod chamber of the power take-off cylinder, the inlet port is connected to the outlet end of the inlet oil circuit, and the return oil port is connected to the inlet end of the return oil circuit.

[0011] The reversing valve can switch between a first working position and a second working position. In the first working position, the first working port is connected to the oil inlet and the second working port is connected to the oil return port. In the second working position, the second working port is connected to the oil inlet and the first working port is connected to the oil return port.

[0012] Optionally, the brake hydraulic system further includes an accumulator disposed in the oil circuit between the brake filling valve assembly and the brake foot valve assembly, and the oil inlet end of the oil inlet circuit is connected to the accumulator.

[0013] Optionally, the cylinder control system further includes a control valve and a pressure sensor. The control valve is used to control the opening or closing of the oil inlet circuit, and the pressure sensor is used to detect the oil pressure at the oil inlet end of the oil inlet circuit. The crane power system further includes a power take-off controller, which is communicatively connected to the control valve and the pressure sensor, and is used to control the control valve according to the oil pressure parameters detected by the pressure sensor, so as to open or close the oil inlet circuit.

[0014] Optionally, the power take-off controller is also communicatively connected to the engine and is used to control the control valve according to the oil pressure parameters detected by the pressure sensor and the engine speed parameters, so as to open or close the oil inlet circuit.

[0015] Optionally, the brake hydraulic system includes multiple accumulators, and the oil inlet circuit includes:

[0016] The main oil circuit has its outlet end connected to the oil inlet.

[0017] Multiple branch oil circuits are provided, with the oil outlets of the multiple branch oil circuits connected to the oil inlet of the main oil circuit, and the oil inlet of the multiple branch oil circuits connected to the multiple accumulators in a corresponding manner.

[0018] Optionally, a pressure reducing valve is provided on the main oil line.

[0019] The present invention also provides a tire crane, which includes the above-described crane power system.

[0020] The present invention also provides a control method for the above-mentioned crane power system, the control method for the crane power system comprising:

[0021] In response to the power take-off start signal, the first oil pressure parameter at the oil inlet end of the oil inlet circuit and the engine speed parameter are acquired;

[0022] Based on the first oil pressure parameter and the speed parameter, determine whether to control the power take-off cylinder to drive the power take-off unit to switch to the on state.

[0023] Optionally, the step of determining whether to control the power take-off cylinder to drive the power take-off unit to switch to the on state based on the first oil pressure parameter and the rotational speed parameter includes:

[0024] When the first oil pressure parameter is equal to or greater than the first preset oil pressure parameter, and the speed parameter is equal to 0, the power take-off cylinder is controlled to drive the power take-off unit to switch to the on state.

[0025] Optionally, the control method for the crane power system further includes:

[0026] Obtain the second oil pressure parameters of the upper vehicle hydraulic system;

[0027] Based on the second hydraulic pressure parameter, determine whether the second hydraulic pressure parameter is equal to or greater than the second preset hydraulic pressure parameter. If yes, generate and send a power take-off (PTO) signal indicating that the PTO is in the on state; otherwise, generate and send a power take-off (PTO) signal indicating that the PTO is in the off state or in a fault state.

[0028] Through the above technical solution, a power take-off (PTO) is added between the gearbox and the main oil pump in the invented crane power system. Driven by the PTO cylinder, the PTO can switch between an off state and an on state. With this configuration, when the crane is in motion, the PTO is switched to the off state. At this time, the power output from the engine cannot be transmitted to the main oil pump through the gearbox and PTO, and the main oil pump is in a stopped state. The power output from the engine can be fully used for the unloading operation. This effectively reduces the crane's fuel consumption during travel, improves the crane's travel capacity and the service life of the main oil pump, and avoids the problem of difficult engine starting in low ambient temperatures. In addition, the invented crane power system also has an inlet oil circuit that introduces high-pressure hydraulic oil from the brake hydraulic system to the PTO cylinder. With this configuration, the high-pressure hydraulic oil in the brake hydraulic system can serve as the hydraulic oil source to drive the PTO cylinder. When the engine is stopped, the PTO cylinder can be driven, realizing the connection between the power output end of the PTO and the power input end of the main oil pump.

[0029] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of a crane power system in one embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the crane power system in another embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the crane power system in another embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Engine 2. Transmission

[0036] 3 Main oil pump 4 Upper hydraulic system

[0037] 5 Power Take-Off (PTO) 6 Power Take-Off Cylinder

[0038] 7. Reversing valve 8. Pressure sensor

[0039] 9. Brake fluid filling valve assembly; 10. Brake foot valve assembly

[0040] 11 Accumulator 12 Pressure reducing valve

[0041] L1 Return oil circuit L2 Inlet oil circuit

[0042] L21 Main oil circuit, L22 Branch oil circuit Detailed Implementation

[0043] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0045] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used to describe the relative positions of components in relation to the directions shown in the accompanying drawings or in relation to the vertical, perpendicular, or gravitational directions.

[0046] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] The present invention first provides a crane power system.

[0048] In one implementation, refer to the appendix. Figure 1 To be continued Figure 3 As shown, the crane power system includes an upper hydraulic system 4 and a brake hydraulic system. The crane power system also includes an engine 1, a gearbox 2, a main oil pump 3, a power take-off (PTO) 5, a PTO cylinder 6, and a cylinder control system. The power input end of the gearbox 2 is connected to the power output end of the engine 1. The main oil pump 3 is used to pump hydraulic oil from the hydraulic oil source to the upper hydraulic system 4. The power input end of the PTO 5 is connected to the power output end of the gearbox 2, and the power output end of the PTO 5 is connected to the power input end of the main oil pump 3. The PTO 5 can switch between a disconnected state and a connected state under the drive of the PTO cylinder 6. The oil inlet end is connected to the brake hydraulic system, and the oil outlet L2 can introduce high-pressure hydraulic oil from the brake hydraulic system to the PTO cylinder 6 to drive the PTO cylinder 6.

[0049] In the crane power system of this embodiment, a power take-off (PTO) 5 is added between the gearbox 2 and the main oil pump 3. Driven by the PTO cylinder 6, the PTO 5 can switch between a disconnected state and a connected state. With this configuration, when the crane is in motion, the PTO 5 is switched to the disconnected state. At this time, the power output of the engine 1 cannot be transmitted to the main oil pump 3 through the gearbox 2 and the PTO 5, and the main oil pump 3 is in a stopped state. The power output of the engine 1 can be fully used for the unloading operation. This effectively reduces the fuel consumption of the crane during travel, improves the crane's travel capacity and the service life of the main oil pump, and avoids the problem of difficulty in starting the engine 1 when the ambient temperature is low. In addition, the crane power system of this invention also has an oil passage L2 that can introduce high-pressure hydraulic oil from the brake hydraulic system to the outlet oil passage L2 of the PTO cylinder 6. With this configuration, the high-pressure hydraulic oil in the brake hydraulic system can serve as the hydraulic oil source to drive the PTO cylinder 6. When the engine 1 is stopped, the PTO cylinder 6 can be driven, realizing the connection between the power output end of the PTO 5 and the power input end of the main oil pump 3.

[0050] It is understood that the brake hydraulic system and the upper vehicle hydraulic system 4 are system structures well known to those skilled in the art, and are not part of the core improvements of this application. Therefore, their detailed structure and function will not be described in detail here.

[0051] In addition, the power take-off 5 is a power take-off 5 with a clutch function. For example, the power take-off 5 is equipped with a clutch, or the power take-off 5 has a transmission gear set that can be separated and engaged, or the power take-off 5 has a gear sleeve that plays a clutch function. That is, both the power input end and the power output end of the power take-off 5 are equipped with gears or transmission teeth. The gear sleeve can connect or disconnect the power input end and the power output end of the power take-off 5 so that power can be transmitted or disconnected between the power input end and the power output end of the power take-off 5. The power take-off cylinder 6 drives the clutch, transmission gear set or gear sleeve to switch the power take-off 5 between the disconnected state and the connected state.

[0052] In one implementation, refer to the appendix. Figure 1 To be continued Figure 3 As shown, the hydraulic cylinder control system also includes a reversing valve 7 and a return oil circuit L1. The reversing valve 7 has a first working port, a second working port, an inlet port, and a return oil port. The first working port is connected to the rodless chamber of the power take-off cylinder 6, the second working port is connected to the rod chamber of the power take-off cylinder 6, the inlet port is connected to the outlet end of the outlet oil circuit L2, and the return oil port is connected to the inlet end of the return oil circuit L1. The reversing valve 7 can switch between a first working position and a second working position. In the first working position, the first working port is connected to the inlet port and the second working port is connected to the return oil port. In the second working position, the second working port is connected to the inlet port and the first working port is connected to the return oil port.

[0053] Understandably, when the directional valve 7 is in the first working position, the oil outlet of the oil outlet circuit L2 is connected to the rodless chamber of the power take-off cylinder 6, and the oil inlet of the oil return circuit L1 is connected to the rod chamber of the power take-off cylinder 6, thus enabling the extension action of the power take-off cylinder 6. When the directional valve 7 is in the second working position, the oil outlet of the oil outlet circuit L2 is connected to the rod chamber of the power take-off cylinder 6, and the oil inlet of the oil return circuit L1 is connected to the rodless chamber of the power take-off cylinder 6, thus enabling the retraction action of the power take-off cylinder 6.

[0054] In this embodiment, the reversing valve 7 can also be switched to a third working position. In the third working position, both the first and second working ports are connected to the return port. This configuration ensures that the oil outlet of the oil supply line L2 is cut off, and the oil inlet of the return oil supply line L1 is connected to the rod-side and rodless-side chambers of the power take-off cylinder 6, respectively. At this time, the oil supply line L2 is cut off and cannot introduce hydraulic oil into the power take-off cylinder 6. The oil pressure in the rod-side and rodless-side chambers of the power take-off cylinder 6 is equal, maintaining it in the extended or retracted position.

[0055] Specifically, the reversing valve 7 can be a solenoid valve or other valve that can be controlled via communication.

[0056] In one implementation, refer to the appendix. Figure 1 To be continued Figure 3As shown, the brake hydraulic system includes an accumulator 11 installed in the oil line between the brake filling valve group 9 and the brake foot valve group 10, and the oil inlet end of the oil outlet line L2 is connected to the accumulator 11.

[0057] Understandably, in this technical field, accumulators 11 are commonly used in brake hydraulic systems to maintain stable oil pressure. Specifically, when the oil pressure in the brake hydraulic system increases, the accumulator 11 can absorb and store a portion of the hydraulic oil in the brake hydraulic system; when the oil pressure in the brake hydraulic system is too low, the accumulator 11 can replenish the hydraulic oil in the brake hydraulic system, thus achieving the function of maintaining stable oil pressure in the brake hydraulic system. In this embodiment, the accumulator 11's ability to store and maintain pressure is utilized to serve as the hydraulic oil source for driving the power take-off cylinder 6. In practical applications, the oil outlet line L2 can introduce the high-pressure hydraulic oil stored in the accumulator 11 into the power take-off cylinder 6, thereby realizing the drive control of the power take-off cylinder 6.

[0058] In one embodiment, the cylinder control system further includes a control valve and a pressure sensor 8. The control valve is used to control the opening or closing of the oil outlet circuit L2, and the pressure sensor 8 is used to detect the oil pressure at the oil inlet of the oil outlet circuit L2. The crane power system also includes a power take-off controller, which is communicatively connected to the control valve and the pressure sensor 8, and is used to control the control valve according to the oil pressure parameters detected by the pressure sensor 8, so as to open or close the oil outlet circuit L2.

[0059] In this embodiment, refer to the appendix. Figure 3 As shown, the control valve can be the directional valve 7 in the aforementioned embodiment. (Refer to the attached document.) Figure 2 As shown, the control valve can also be a solenoid valve specifically installed on the oil outlet line L2.

[0060] The power take-off controller controls the control valve based on the oil pressure parameters detected by the pressure sensor 8, thereby opening or closing the oil outlet circuit L2. In practical applications, the power take-off controller can be set to open the oil outlet circuit L2 when the oil pressure parameter detected by the pressure sensor 8 is equal to or greater than a preset value after receiving the power take-off start signal, and to keep the oil outlet circuit L2 closed when the oil pressure parameter detected by the pressure sensor 8 is less than the preset value. In this way, the situation of low oil pressure in the input and output oil circuits L2, which could lead to malfunction of the power take-off cylinder 6, can be effectively avoided.

[0061] In addition, for ease of operation, a power take-off switch that communicates with the power take-off controller can be installed in the crane's cab. The operator can send a power take-off start signal to the power take-off controller by operating the power take-off switch.

[0062] In one embodiment, the power take-off controller is also communicatively connected to the engine 1 and is used to control the control valve based on the oil pressure parameters detected by the pressure sensor 8 and the engine speed parameters of the engine 1, so as to open or close the oil outlet circuit L2. With this configuration, in practical applications, the power take-off controller can be set to, upon receiving the power take-off start signal, control the control valve to open the oil outlet circuit L2 when the oil pressure parameters detected by the pressure sensor 8 are equal to or greater than a preset value and the engine speed parameters of the engine 1 are equal to 0; and control the control valve to keep the oil outlet circuit L2 closed when the oil pressure parameters detected by the pressure sensor 8 are less than the preset value or the engine speed parameters of the engine 1 are greater than 0. This effectively avoids situations where the oil pressure in the input and output oil circuits L2 is too low, leading to a malfunction of the power take-off cylinder 6. It also avoids damage to the power take-off unit 5 caused by driving it to switch to the engaged state during engine 1 operation.

[0063] In one implementation, refer to the appendix. Figure 1 As shown, the brake hydraulic system includes multiple accumulators 11. The oil outlet circuit L2 includes a main oil circuit L21 and multiple branch oil circuits L22. The oil outlet of the main oil circuit L21 is connected to the oil inlet, and the oil outlets of the multiple branch oil circuits L22 are respectively connected to the oil inlets of the main oil circuit L21. The oil inlets of the multiple branch oil circuits L22 are respectively connected to the multiple accumulators 11. With this configuration, the multiple accumulators 11 in the brake hydraulic system all become the hydraulic oil source for driving the power take-off cylinder 6, effectively ensuring sufficient hydraulic oil quantity for driving the power take-off cylinder 6 and increasing the number of times the power take-off cylinder 6 can be operated.

[0064] In practical applications, pressure sensors 8 can be installed at the inlet ends of multiple branch oil circuits L22, and solenoid valves serving as control valves can be installed on each of the multiple branch oil circuits L22. The power take-off controller of the crane's power system controls the corresponding solenoid valves based on the detection results of the multiple pressure sensors 8, thereby shutting off or opening the corresponding branch oil circuit L22. Specifically, ball valves or cone valves are suitable for use to reduce hydraulic oil leakage when shutting off, thus avoiding any impact on the operation of the brake hydraulic system.

[0065] In one embodiment, a pressure reducing valve 12 is provided on the main oil circuit L21.

[0066] Understandably, the pressure reducing valve 12 can reduce the hydraulic oil pressure entering the power take-off cylinder 6, so that the hydraulic oil pressure entering the power take-off cylinder 6 is maintained at a preset value.

[0067] The present invention also provides a tire crane, which includes the crane power system described above. The specific structure of the crane power system is as described in the above embodiments. Since this tire crane adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0068] The present invention also provides a control method for a crane power system according to the above description, the control method for the crane power system comprising:

[0069] In response to the power take-off start signal, the first oil pressure parameter at the oil inlet of oil circuit L2 and the speed parameter of engine 1 are obtained;

[0070] Based on the first oil pressure parameter and speed parameter, determine whether to control the power take-off cylinder 6 to drive the power take-off unit 5 to switch to the on state.

[0071] Further, the step of determining whether to control the power take-off cylinder 6 to drive the power take-off unit 5 to switch to the on state based on the first oil pressure parameter and speed parameter includes:

[0072] When the first oil pressure parameter is equal to or greater than the first preset oil pressure parameter, and the speed parameter is equal to 0, the power take-off cylinder 6 is controlled to drive the power take-off unit 5 to switch to the on state.

[0073] This configuration effectively prevents the low oil pressure in the input / output oil circuit L2 from causing a malfunction in the power take-off cylinder 6. It also prevents damage to the power take-off 5 or the main oil pump 3 caused by connecting the power output end of the power take-off 5 to the power input end of the main oil pump 3 while the engine 1 is running.

[0074] In one embodiment, the control method for the crane power system further includes:

[0075] Obtain the second oil pressure parameters of the upper hydraulic system 4;

[0076] Based on the second oil pressure parameter, determine whether the second oil pressure parameter is equal to or greater than the second preset oil pressure parameter. If yes, generate and send a signal indicating that the power take-off 5 is in the on state and has taken power. If no, generate and send a signal indicating that the power take-off 5 is in the off state or in a fault state and has not taken power.

[0077] Understandably, when the power take-off (PTO) 5 is in the on state, the power of the engine 1 can be transmitted to the main oil pump 3 through the PTO 5 to drive the main oil pump 3 to operate. The main oil pump 3 inputs hydraulic oil into the upper vehicle hydraulic system 4. At this time, the oil pressure of the upper vehicle hydraulic system 4 increases. Based on this principle, in this embodiment, the second oil pressure parameter of the upper vehicle hydraulic system 4 is obtained. The state of the PTO 5 can be determined according to whether the second oil pressure parameter reaches a preset value. In this way, the operator can intuitively determine whether the power take-off was successful based on the issued power take-off signal or power take-off signal. In practical applications, the power take-off signal and the power take-off signal can be presented through icon display, voice broadcast, etc.

[0078] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0079] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0080] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A crane power system, the crane power system comprising an upper carriage hydraulic system (4) and a braking hydraulic system, characterized in that, The crane power system also includes: Engine (1); The gearbox (2) has its power input end connected to the power output end of the engine (1); The main oil pump (3) is used to pump the hydraulic oil source to the upper vehicle hydraulic system (4). The power take-off (5) and the power take-off cylinder (6) are provided. The power input end of the power take-off (5) is connected to the power output end of the gearbox (2), and the power output end of the power take-off (5) is connected to the power input end of the main oil pump (3). The power take-off (5) can switch between the disconnected state and the connected state under the drive of the power take-off cylinder (6). The hydraulic cylinder control system includes an oil inlet circuit (L2), the oil outlet of which is connected to the power take-off cylinder (6), and the oil inlet is connected to the brake hydraulic system. The oil inlet circuit (L2) can introduce high-pressure hydraulic oil from the brake hydraulic system into the power take-off cylinder (6) to drive the power take-off cylinder (6). The brake hydraulic system also includes an accumulator (11) installed in the oil line between the brake filling valve group (9) and the brake foot valve group (10), and the oil inlet end of the oil inlet line (L2) is connected to the accumulator (11).

2. The crane power system according to claim 1, characterized in that, The cylinder control system further includes a reversing valve (7) and a return oil passage (L1). The reversing valve (7) has a first working oil port, a second working oil port, an inlet oil port and a return oil port. The first working oil port is connected to the rodless chamber of the power take-off cylinder (6), the second working oil port is connected to the rod chamber of the power take-off cylinder (6), the inlet oil port is connected to the outlet end of the inlet oil passage (L2), and the return oil port is connected to the inlet end of the return oil passage (L1). The reversing valve (7) can switch between a first working position and a second working position. In the first working position, the first working port is connected to the oil inlet and the second working port is connected to the oil return port. In the second working position, the second working port is connected to the oil inlet and the first working port is connected to the oil return port.

3. The crane power system according to claim 1, characterized in that, The cylinder control system also includes a control valve and a pressure sensor (8). The control valve is used to control the opening or closing of the oil inlet circuit (L2), and the pressure sensor (8) is used to detect the oil pressure at the oil inlet end of the oil inlet circuit (L2). The crane power system also includes a power take-off controller, which is communicatively connected to the control valve and the pressure sensor (8) respectively, and is used to control the control valve according to the oil pressure parameters detected by the pressure sensor (8) so as to open or close the oil inlet circuit (L2).

4. The crane power system according to claim 3, characterized in that, The power take-off controller is also connected in communication with the engine (1) and is used to control the control valve according to the oil pressure parameters detected by the pressure sensor (8) and the speed parameters of the engine (1) so as to open or close the oil inlet circuit (L2).

5. The crane power system according to claim 2, characterized in that, The brake hydraulic system includes multiple accumulators (11), and the oil inlet circuit (L2) includes: The main oil passage (L21) has its outlet end connected to the oil inlet. Multiple branch oil passages (L22) are provided, with the oil outlets of the multiple branch oil passages (L22) connected to the oil inlet of the main oil passage (L21), and the oil inlet of the multiple branch oil passages (L22) connected to the multiple accumulators (11) one by one.

6. The crane power system according to claim 5, characterized in that, A pressure reducing valve (12) is installed on the main oil line.

7. A tire crane, characterized in that, The tire crane includes a crane power system according to any one of claims 1 to 6.

8. A control method for a crane power system according to any one of claims 1 to 6, characterized in that, The control method for the crane power system includes: In response to the power take-off start signal, the first oil pressure parameter of the oil inlet end of the oil inlet circuit (L2) and the speed parameter of the engine (1) are obtained; Based on the first oil pressure parameter and the speed parameter, determine whether to control the power take-off cylinder (6) to drive the power take-off unit (5) to switch to the on state.

9. The control method for a crane power system according to claim 8, characterized in that, The step of determining whether to control the power take-off cylinder (6) to drive the power take-off unit (5) to switch to the on state based on the first oil pressure parameter and the speed parameter includes: When the first oil pressure parameter is equal to or greater than the first preset oil pressure parameter, and the speed parameter is equal to 0, the power take-off cylinder (6) is controlled to drive the power take-off device (5) to switch to the on state.

10. The control method for a crane power system according to claim 8, characterized in that, The control method for the crane power system also includes: Obtain the second oil pressure parameters of the upper vehicle hydraulic system (4); Based on the second oil pressure parameter, determine whether the second oil pressure parameter is equal to or greater than the second preset oil pressure parameter. If yes, generate and send a signal indicating that the power take-off (5) is in the on state and has taken power. If no, generate and send a signal indicating that the power take-off (5) is in the off state or in a fault state and has not taken power.

Images