Mobile hydraulic tire crane power system and mobile hydraulic tire crane

Abstract

The utility model discloses a mobile hydraulic tire crane power system and a mobile hydraulic tire crane, and relates to the technical field of hydraulic tire cranes. The mobile hydraulic tire crane power system is applied to the mobile hydraulic tire crane, and the mobile hydraulic tire crane includes a hydraulic oil pump. The mobile hydraulic tire crane power system includes an external electric contactor, a power inverter and an electric motor. Among them, the external electric contactor can connect / disconnect the connection of an external power supply, the power inverter can convert the external power supply into an AC drive power output, and the electric motor can drive the hydraulic oil pump to work according to the power provided by the AC drive power supply. In this way, the utility model replaces the high-power diesel engine with an electric motor to drive the hydraulic oil pump, thereby reducing pollution emissions and noise generation. Moreover, when the mobile hydraulic tire crane of the utility model is on standby or waiting for goods, the electric motor can stop working, saving energy and saving use costs.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic tire cranes, in particular to a mobile hydraulic tire crane power system and a mobile hydraulic tire crane. Background Art

[0002] At present, mobile hydraulic tire cranes have become an indispensable and important tool in modern construction, transportation and manufacturing industries. Mobile hydraulic tire cranes transmit energy through hydraulic oil, and realize the lifting and moving operations of mobile hydraulic tire cranes through components such as hydraulic oil pumps, hydraulic motors, and transmission mechanisms.

[0003] However, the power system of the existing mobile hydraulic tire crane generally uses a high-power diesel engine to drive the mobile hydraulic tire crane, which is highly dependent on fuel and produces a large amount of exhaust emissions when the fuel is burned, causing environmental pollution. Utility Model Content

[0004] The main purpose of the utility model is to provide a mobile hydraulic tire crane power system, aiming to solve the problems of high fuel dependence and environmental pollution existing in the existing mobile hydraulic tire crane using a high-power diesel engine set as a power source.

[0005] In order to achieve the above-mentioned purpose, the mobile hydraulic tire crane power system proposed in the utility model is applied to the mobile hydraulic tire crane, the mobile hydraulic tire crane includes a hydraulic oil pump, and the mobile hydraulic tire crane power system includes:

[0006] An external electrical contactor for connecting / disconnecting an external power source;

[0007] A power inverter, a first end of which is electrically connected to the external electrical contactor, and the power inverter is used to convert an external power supply into an AC drive power output;

[0008] An electric motor, wherein the controlled end of the electric motor is electrically connected to the second end of the power inverter, and the rotating shaft of the electric motor is mechanically connected to the hydraulic oil pump of the mobile hydraulic tire crane; the electric motor is used to drive the hydraulic oil pump to work according to the power provided by the AC driving power supply.

[0009] In one embodiment, the power inverter is also used to recover the electric energy of the motor during deceleration braking and convert it into a DC power supply output; the mobile hydraulic tire crane power system also includes:

[0010] Energy storage unit;

[0011] A bidirectional DC / DC, wherein a first end of the bidirectional DC / DC is electrically connected to a third end of the power inverter, and the bidirectional DC / DC is used to convert the voltage of the DC power output by the power inverter into the energy storage unit, and to convert the voltage of the DC power output by the energy storage unit into the power inverter.

[0012] In one embodiment, the power inverter comprises:

[0013] a first frequency converter, wherein an input end of the first frequency converter is electrically connected to the external electrical contactor, and the first frequency converter is used to convert an external power supply into a DC power supply output;

[0014] A second frequency converter, wherein the first end of the second frequency converter and the output end of the first frequency converter are connected to the first end of the bidirectional DC / DC; the second end of the second frequency converter is connected to the controlled end of the motor; the second frequency converter is used to convert the DC power output by the first frequency converter into an AC drive power output, and to recover the electric energy during deceleration braking of the motor and convert it into a DC power output.

[0015] In one embodiment, the energy storage unit is a supercapacitor.

[0016] The utility model also provides a mobile hydraulic tire crane, comprising a hydraulic oil pump and the mobile hydraulic tire crane power system as described above.

[0017] In one embodiment, the mobile hydraulic tire crane further includes a hydraulic oil pipe and a plurality of hydraulic motors; the plurality of hydraulic motors are used to be connected to the hydraulic oil pump via the hydraulic oil pipe.

[0018] In one embodiment, the plurality of hydraulic motors include a lifting motor, a luffing motor, a slewing motor, a traveling motor and an outrigger motor.

[0019] In one embodiment, the mobile hydraulic tire crane further includes a lifting transmission mechanism, a luffing transmission mechanism, a slewing transmission mechanism, a traveling transmission mechanism and an outrigger oil cylinder;

[0020] Among them, the lifting transmission mechanism is mechanically connected to the lifting motor, the luffing transmission mechanism is mechanically connected to the luffing motor, the slewing transmission mechanism is mechanically connected to the slewing motor, the walking transmission mechanism is mechanically connected to the walking motor, and the outrigger cylinder is mechanically connected to the outrigger motor.

[0021] In one embodiment, the mobile hydraulic tire crane further includes a central swivel joint, and the central swivel joint is arranged on the hydraulic oil pipe between the hydraulic oil pump and the travel motor and the outrigger motor.

[0022] In one embodiment, the mobile hydraulic tire crane further includes a connecting sleeve, a key, a first shock absorbing plate and a second shock absorbing plate;

[0023] Among them, the rotating shaft of the motor of the mobile hydraulic tire crane power system and the oil pump shaft of the hydraulic oil pump are both provided with grooves; the inner walls at both ends of the connecting sleeve are respectively provided with grooves corresponding to the grooves of the rotating shaft and the grooves of the oil pump shaft, and the grooves of the connecting sleeve respectively form key grooves with the grooves of the motor shaft and the grooves of the oil pump shaft, and the keys are arranged inside the key grooves; the first shock-absorbing plate is arranged on one side of the motor of the mobile hydraulic tire crane power system, and the second shock-absorbing plate is arranged on one side of the hydraulic oil pump.

[0024] The technical solution of the utility model adopts a mobile hydraulic tire crane power system, which is applied to the mobile hydraulic tire crane. The mobile hydraulic tire crane includes a hydraulic oil pump. The mobile hydraulic tire crane power system includes an external electric contactor, a power inverter and an electric motor. Among them, the external electric contactor can connect / disconnect the connection of the external power supply, the power inverter can convert the external power supply into an AC drive power output, and the motor can provide power according to the AC drive power supply to drive the hydraulic oil pump to work. In this way, the utility model replaces the high-power diesel engine with an electric motor to drive the hydraulic oil pump, reducing pollution emissions and noise generation. Moreover, when the mobile hydraulic tire crane using the utility model is on standby or waiting for goods, the motor can stop working, saving energy and saving use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model 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 some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A structural schematic diagram of an embodiment of a mobile hydraulic tire crane power system provided by the utility model;

[0027] Figure 2 A structural schematic diagram of an embodiment of a mobile hydraulic tire crane provided by the utility model;

[0028] Figure 3 A structural schematic diagram of another embodiment of the mobile hydraulic tire crane provided by the utility model;

[0029] Figure 4A product schematic diagram of an embodiment of a mobile hydraulic tire crane provided by the utility model;

[0030] Figure 5 It is a schematic structural diagram of an exemplary mobile hydraulic tire crane.

[0031] Description of Figure Numbers:

[0032] Label name Label name 10 External electrical contactor 20 Power inverter 30 Electric Motor 40 Energy storage unit 50 Bidirectional DC / DC 21 First inverter 22 Second inverter 60 Hydraulic oil pump 71 Connecting sleeve 72 key 73 First damping plate 74 Second shock absorbing plate

[0033] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0037] The power system of existing mobile hydraulic tire cranes generally uses a high-power diesel engine to drive the mobile hydraulic tire crane, which is highly dependent on fuel and produces a large amount of exhaust emissions when the fuel is burned, causing environmental pollution. Figure 5 , Figure 5It is a schematic diagram of the structure of an exemplary mobile hydraulic tire crane. As an exemplary comparative document, the mobile hydraulic tire crane adopts a power variable speed diesel engine to drive the hydraulic oil pump. The hydraulic oil pump drives the hydraulic motors of each mechanism through the hydraulic valves of each mechanism. The hydraulic motor drives the mechanical transmission device of the corresponding mechanism to perform loading and unloading actions. The speed of each mechanism is controlled by changing the speed of the variable speed diesel engine. It can be seen that the mobile hydraulic tire crane power system of the mobile hydraulic tire crane is driven by a high-power diesel engine set. Due to the energy-saving and green environmental protection requirements of the wharf, the emissions of the high-power diesel engine set cannot meet the national environmental protection standards, so the hydraulic tire crane power system needs to be transformed and upgraded.

[0038] The utility model provides a mobile hydraulic tire crane power system.

[0039] See also Figure 1 In one embodiment of the utility model, the mobile hydraulic tire crane power system is applied to the mobile hydraulic tire crane, the mobile hydraulic tire crane includes a hydraulic oil pump 60, and the mobile hydraulic tire crane power system includes:

[0040] An external electrical contactor 10, used to connect / disconnect an external power source;

[0041] It should be noted that when the external electrical contactor 10 is in the connected state, the input of the external power supply is connected; when the external electrical contactor 10 is in the disconnected state, the input of the external power supply is cut off. In this way, the external electrical contactor 10 can isolate the external power supply from the subsequent power circuit to ensure the safety of power use. In this embodiment, the external electrical contactor 10 can handle higher currents and voltages, and can be used to protect the circuit from safety issues such as overload or short circuit, thereby improving the reliability and durability of the circuit.

[0042] A power inverter 20, a first end of which is electrically connected to the external electrical contactor 10, and the power inverter 20 is used to convert an external power supply into an AC drive power output;

[0043] It should be noted that the power inverter 20 may include components such as a rectifier, an intermediate DC capacitor, an inverter, a control circuit, a filter, and a protection circuit. After the external power supply is rectified by the rectifier, it is converted into direct current, wherein the rectifier may adopt different topological structures, such as single-phase or three-phase rectifier bridge structures. The intermediate DC capacitor may smooth the output of the rectified direct current to reduce fluctuations and noise. The inverter may convert the rectified direct current into the required AC drive power output, wherein the inverter may adopt multiple groups of IGBTs (insulated gate bipolar transistors) to achieve power inversion and control. The control circuit may include a drive circuit, a logic control unit (such as a microprocessor or a digital signal processor), a monitoring interface, etc. The control circuit may monitor and adjust the output frequency, voltage, and current of the inverter to meet the power requirements of the motor 30 under different working conditions. The filter may reduce the harmonics and electromagnetic interference output by the inverter, and the protection circuit may provide overvoltage, overcurrent, and short-circuit protection to protect the inverter from damage.

[0044] The motor 30, the controlled end of the motor 30 is electrically connected to the second end of the power inverter 20, and the rotating shaft of the motor 30 is mechanically connected to the hydraulic oil pump 60 of the mobile hydraulic tire crane; the motor 30 is used to provide power according to the AC driving power supply to drive the hydraulic oil pump 60 to work.

[0045] It should be noted that the motor 30 can be a variable frequency speed regulating motor 30, and the variable frequency speed regulation is performed according to the AC driving power output by the power inverter 20 to drive the operation of the hydraulic oil pump 60. The motor 30 may include a stator and a rotor, the stator is fixed and the rotor rotates, and the conversion of electrical energy into mechanical energy is realized through the principle of electromagnetic induction. Since the motor 30 usually generates a certain amount of heat, the motor 30 may also include a cooling system to maintain its operating temperature within a safe range to extend the life of the motor 30. The motor 30 has a sensor or other feedback device that can monitor the operating status, speed, temperature and other parameters of the motor 30, so that the controller of the motor 30 can adjust the operation of the motor 30 in real time.

[0046] In this embodiment, the external electric contactor 10 can connect / disconnect the external power supply, the power inverter 20 can convert the external power supply into an AC drive power output, and the motor 30 can drive the hydraulic oil pump 60 according to the AC drive power. In this way, the motor 30 replaces the high-power diesel engine to drive the hydraulic oil pump 60 in this embodiment, reducing pollution emissions and noise generation. Compared with the prior art, the diesel engine of the existing mobile hydraulic tire crane is running when it is on standby or waiting for cargo, while in this embodiment, the motor 30 does not work in this working condition, saving energy and use costs.

[0047] In the present invention, the external electric contactor 10 can connect / disconnect the external power supply, the power inverter 20 can convert the external power supply into an AC drive power output, and the motor 30 can drive the hydraulic oil pump 60 according to the AC drive power. In this way, the present invention uses the motor 30 to replace the high-power diesel engine to drive the hydraulic oil pump 60, reducing pollution emissions and noise generation. Compared with the prior art, the diesel engine of the existing mobile hydraulic tire crane is running when it is on standby or waiting for cargo, while the motor 30 of the present invention does not work in this working condition, saving energy and saving use costs.

[0048] See also Figure 1 In one embodiment of the utility model, the power inverter 20 is also used to recover the electric energy of the motor 30 during deceleration braking and convert it into a DC power output; the mobile hydraulic tire crane power system also includes:

[0049] Energy storage unit 40;

[0050] Bidirectional DC / DC50, the first end of the bidirectional DC / DC50 is electrically connected to the third end of the power inverter 20, and the bidirectional DC / DC50 is used to convert the DC power output by the power inverter 20 into a voltage and store it in the energy storage unit 40, and to convert the DC power output by the energy storage unit 40 into a voltage and output it to the power inverter 20.

[0051] It should be noted that the bidirectional DC / DC50 is a bidirectional converter that can realize bidirectional DC voltage conversion, wherein the bidirectional DC / DC50 may include components such as filters, switching circuits, and energy storage elements. When the bidirectional DC / DC50 is working, the input voltage can be filtered through a filter or an input capacitor to remove possible noise and interference, ensure the stability of the input voltage, and then the voltage conversion can be realized through a switching circuit, which can be a MOSFET, a BJT or other types of switching devices. The switching state of the switching device can be controlled by the input signal of the control circuit therein, and the working cycle and frequency of the switching device can be adjusted as needed. By controlling the working state and working cycle of the switching device, the input voltage can be boosted to the output voltage, or it can be bucked to the output voltage. In the voltage conversion process, energy storage and release can be realized by energy storage elements (such as inductors and capacitors). When the output voltage is output, the control circuit can use a feedback control loop to detect the output voltage, and adjust the working state of the switching device according to the change of the output voltage to achieve the stability and accuracy of the output voltage.

[0052] In this embodiment, the motor 30 enters a power generation state during deceleration and braking. The mobile hydraulic tire crane power system can recover the electric energy generated by the motor 30 during the power generation state, and store the electric energy in the energy storage unit 40 to recycle the recovered electric energy. Specifically, when the motor 30 is decelerating and braking, the circuit inverter can recover the electric energy of the motor 30 during deceleration and braking, and convert it into a DC power supply output, and the bidirectional DC / DC50 can convert the voltage of the DC power output by the power inverter 20 and store it in the energy storage unit 40. When the motor 30 needs to be driven and needs to input electric energy, the bidirectional DC / DC50 can convert the voltage of the DC power output by the energy storage unit 40 and output it to the power inverter 20, and the power inverter 20 converts it into an AC drive power supply and outputs it to the motor 30. In this way, this embodiment realizes the reuse of energy and saves energy.

[0053] See also Figure 1 In one embodiment of the present utility model, the power inverter 20 includes:

[0054] A first frequency converter 21, an input end of the first frequency converter 21 is electrically connected to an external electrical contactor, and the first frequency converter 21 is used to convert an external power supply into a DC power output;

[0055] The second frequency converter 22, the first end of the second frequency converter 22 and the output end of the first frequency converter 21 are connected to the first end of the bidirectional DC / DC 50; the second end of the second frequency converter 22 is connected to the controlled end of the motor 30; the second frequency converter 22 is used to convert the DC power output by the first frequency converter 21 into an AC drive power output, and to recover the electric energy of the motor 30 during deceleration braking, and convert it into a DC power output.

[0056] It should be noted that the first frequency converter 21 may include a first frequency conversion circuit to convert the input external power supply into a DC power supply. The second frequency converter 22 may include a second frequency conversion circuit to convert the DC power supply into an AC drive power supply with adjustable voltage and frequency to meet the requirements of variable frequency speed regulation of the motor 30. The second frequency converter 22 may also include a rectifier feedback circuit to recover the electric energy generated by the motor 30 in the deceleration braking state and convert it into a stable DC power output.

[0057] In this embodiment, when the motor 30 drives the hydraulic oil pipe, the first inverter 21 can convert the external power supply into a DC power supply output, and the second inverter 22 can convert the DC power supply output by the first inverter 21 into an AC driving power supply output. When the motor 30 decelerates and brakes, the second inverter 22 can convert the electric energy recovered by the motor 30 into a DC power supply output to the bidirectional DC / DC 50, and then output it to the energy storage unit 40 after voltage conversion by the bidirectional DC / DC 50.

[0058] In an embodiment of the present invention, the energy storage unit 40 is a supercapacitor.

[0059] It should be noted that supercapacitors can quickly accept and release charges, and are suitable for use in working conditions that require instantaneous high power output, such as the start-up of the motor 30 of the hydraulic crane, energy supply during acceleration, and energy recovery during deceleration and braking. Moreover, supercapacitors do not contain heavy metals and harmful chemicals, and are more environmentally friendly and safer than traditional batteries, and are less likely to explode or catch fire. In this embodiment, the supercapacitor can be a high-energy supercapacitor with a high power density, which can quickly accept and release charges, and can effectively support the operation of the power inverter 20 and store energy.

[0060] The utility model also proposes a mobile hydraulic tire crane, which includes a hydraulic oil pump 60 and a mobile hydraulic tire crane power system. The specific structure of the mobile hydraulic tire crane power system refers to the above-mentioned embodiment. Since the mobile hydraulic tire crane adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0061] Among them, see Figure 4 , Figure 4 The product structure diagram of a mobile hydraulic tire crane is shown in FIG. The mobile hydraulic tire crane is provided with a mobile hydraulic tire crane power system to provide mechanical energy to a hydraulic oil pump 60 .

[0062] The hydraulic oil pump 60 may include a hydraulic pump body and a regulating device. The hydraulic pump body includes working parts such as a rotor, a blade or a plunger for pumping liquid, and the regulating device includes working parts such as a hydraulic valve for adjusting the working pressure and flow of the pump. In this embodiment, the mobile hydraulic tire crane power system can drive the hydraulic oil pump 60 to work, reducing pollution emissions.

[0063] See also Figure 2 In one embodiment of the utility model, the mobile hydraulic tire crane further includes a hydraulic oil pipe and a plurality of hydraulic motors; the plurality of hydraulic motors are used to be connected to the hydraulic oil pump 60 through the hydraulic oil pipe.

[0064] In this embodiment, multiple hydraulic motors receive high-pressure hydraulic oil output by the hydraulic oil pump 60 through hydraulic oil pipes, and convert hydraulic energy into kinetic energy to distribute the power output to different moving parts or actuators of the hydraulic crane. Each hydraulic motor can be controlled independently, thereby achieving more flexible and more precise operations, such as lifting, retracting and rotating functions.

[0065] See also Figure 2In one embodiment of the utility model, the plurality of hydraulic motors include a lifting motor, a luffing motor, a slewing motor, a traveling motor and an outrigger motor; the mobile hydraulic tire crane also includes a lifting transmission mechanism, a luffing transmission mechanism, a slewing transmission mechanism, a traveling transmission mechanism and an outrigger oil cylinder;

[0066] Among them, the lifting transmission mechanism is mechanically connected to the lifting motor, the luffing transmission mechanism is mechanically connected to the luffing motor, the slewing transmission mechanism is mechanically connected to the slewing motor, the traveling transmission mechanism is mechanically connected to the traveling motor, and the outrigger cylinder is mechanically connected to the outrigger motor.

[0067] In this embodiment, the lifting motor, the variable-length motor, the slewing motor, the travel motor and the outrigger motor can all provide power. The lifting transmission mechanism is mechanically connected to the lifting motor, and the rotational motion of the lifting motor is converted into a linear ascending or descending motion through a mechanical transmission device (such as a gear box), thereby realizing the height adjustment function of the crane hook. The variable-length transmission mechanism is mechanically connected to the variable-length motor, and the rotational power of the motor is transmitted to the rotating mechanism (such as a rotating ring gear), so that the crane can rotate on a horizontal plane and cover a wider operating area. The slewing transmission mechanism is mechanically connected to the slewing motor, and the rotational motion of the motor is transmitted to the slewing mechanism of the crane, thereby realizing the adjustment of the hook position during the lifting operation. The travel transmission mechanism is mechanically connected to the travel motor, and the tire or crawler system is driven by the power provided by the hydraulic motor, thereby realizing the forward, backward and steering movements of the crane. The outrigger oil cylinder is mechanically connected to the outrigger motor, so that the outrigger can be extended and adjusted to ensure the stability and safety of the crane during the lifting operation. In this way, the multiple hydraulic motors of this embodiment work closely with the multiple transmission mechanisms and outrigger cylinders to realize the various functions of the mobile hydraulic tire crane, including lifting, rotation, movement and stable support, thereby meeting the lifting needs of different engineering occasions.

[0068] See also Figure 2 In one embodiment of the utility model, the mobile hydraulic tire crane also includes a center swivel joint, which is arranged on the hydraulic oil pipe between the hydraulic oil pump 60 and the travel motor and the outrigger motor.

[0069] It should be noted that the travel motor is mechanically connected to the travel transmission mechanism to drive the tire or track system, thereby realizing the forward, backward and steering movements of the crane; the outrigger motor is mechanically connected to the outrigger oil cylinder to enable the outrigger to be retracted and adjusted. It can be seen that the mechanisms of both the travel motor and the outrigger motor need to move and rotate frequently. In this embodiment, in order to ensure that the hydraulic oil pipe can maintain a flexible connection without damage when the motion mechanism moves, and to ensure that the pressure and flow generated by the hydraulic oil pump 60 can be flexibly transmitted to the travel motor and outrigger motor of the crane through the hydraulic oil pipe, a central swivel joint is added to allow the oil pipe to rotate freely.

[0070] See also Figure 3 In one embodiment of the utility model, the mobile hydraulic tire crane further includes a connecting sleeve 71, a key 72, a first damping plate 73 and a second damping plate 74;

[0071] Among them, the rotating shaft of the motor 30 of the mobile hydraulic tire crane power system and the oil pump shaft of the hydraulic oil pump 60 are both provided with grooves; the inner walls at both ends of the connecting sleeve 71 are respectively provided with grooves corresponding to the grooves of the rotating shaft and the grooves of the oil pump shaft, and the grooves of the connecting sleeve 71 respectively form key 72 grooves with the grooves of the motor shaft and the grooves of the oil pump shaft, and the key 72 grooves are provided with keys 72; the first shock-absorbing plate 73 is arranged on one side of the motor 30 of the mobile hydraulic tire crane power system, and the second shock-absorbing plate 74 is arranged on one side of the hydraulic oil pump 60.

[0072] In this embodiment, when the connecting sleeve 71 is installed between the motor 30 and the hydraulic oil pump 60, the groove in the connecting sleeve 71 will be precisely aligned with the grooves on the motor 30 shaft and the hydraulic oil pump 60 shaft. This ensures that the axes of the motor 30 and the hydraulic oil pump 60 remain completely parallel and symmetrical, avoiding unnecessary lateral pressure or relative movement. The key 72 in the key 72 slot can fill the gap between the groove of the connecting sleeve 71 and the groove on the shaft to form a tight connection. The key 72 prevents the shaft from rotating relative to each other during torque transmission and ensures that the rotational power of the motor 30 is effectively transmitted to the hydraulic oil pump 60 while maintaining accurate alignment of the axis. When the motor 30 is running, its rotation is transmitted to the hydraulic oil pump 60 through the connecting sleeve 71, and the key 72 ensures that this transmission is reliable and correct. In this embodiment, the first damping plate 73 is located on the side of the motor 30 of the mobile hydraulic tire crane power system, and the second damping plate 74 is located on the side of the hydraulic oil pump 60, which can absorb and disperse vibration energy and reduce wear and failure caused by energy transmission between the motor 30 and the hydraulic oil pump 60. In this way, this embodiment can improve the efficiency of mechanical energy transmission, reduce vibration and noise during operation, and extend the service life of the motor 30 and the hydraulic oil pump 60.

[0073] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A mobile hydraulic tire crane power system, characterized in that: Applied to a mobile hydraulic tire crane, the mobile hydraulic tire crane includes a hydraulic oil pump, and the mobile hydraulic tire crane power system includes: An external electrical contactor for connecting / disconnecting an external power source; A power inverter, a first end of which is electrically connected to the external electrical contactor, and the power inverter is used to convert an external power supply into an AC drive power output; An electric motor, wherein the controlled end of the electric motor is electrically connected to the second end of the power inverter, and the rotating shaft of the electric motor is mechanically connected to the hydraulic oil pump; the electric motor is used to drive the hydraulic oil pump to work according to the power provided by the AC drive power supply.

2. The mobile hydraulic tire crane power system according to claim 1, characterized in that: The power inverter is also used to recover the electric energy of the motor during deceleration braking and convert it into a DC power supply output; the mobile hydraulic tire crane power system also includes: Energy storage unit; A bidirectional DC / DC, wherein a first end of the bidirectional DC / DC is electrically connected to a third end of the power inverter, and the bidirectional DC / DC is used to convert the voltage of the DC power output by the power inverter into the energy storage unit, and to convert the voltage of the DC power output by the energy storage unit into the power inverter.

3. The mobile hydraulic tire crane power system according to claim 2, characterized in that: The power inverter comprises: a first frequency converter, wherein an input end of the first frequency converter is electrically connected to the external electrical contactor, and the first frequency converter is used to convert an external power supply into a DC power supply output; A second frequency converter, wherein the first end of the second frequency converter and the output end of the first frequency converter are electrically connected to the first end of the bidirectional DC / DC; the second end of the second frequency converter is electrically connected to the controlled end of the motor; the second frequency converter is used to convert the DC power output by the first frequency converter into an AC drive power output, and to recover the electric energy during deceleration braking of the motor and convert it into a DC power output.

4. The mobile hydraulic tire crane power system according to claim 2, characterized in that: The energy storage unit is a supercapacitor.

5. A mobile hydraulic tire crane, characterized in that: The mobile hydraulic tire crane power system comprises a hydraulic oil pump and the mobile hydraulic tire crane power system as claimed in any one of claims 1 to 4.

6. The mobile hydraulic tire crane according to claim 5, characterized in that: It also includes a hydraulic oil pipe and a plurality of hydraulic motors; the plurality of hydraulic motors are used to be connected to the hydraulic oil pump through the hydraulic oil pipe.

7. The mobile hydraulic tire crane according to claim 6, characterized in that: The multiple hydraulic motors include a lifting motor, a variable amplitude motor, a slewing motor, a traveling motor and an outrigger motor.

8. The mobile hydraulic tire crane according to claim 7, characterized in that: It includes lifting transmission mechanism, luffing transmission mechanism, slewing transmission mechanism, traveling transmission mechanism and outrigger oil cylinder; Among them, the lifting transmission mechanism is mechanically connected to the lifting motor, the luffing transmission mechanism is mechanically connected to the luffing motor, the slewing transmission mechanism is mechanically connected to the slewing motor, the walking transmission mechanism is mechanically connected to the walking motor, and the outrigger cylinder is mechanically connected to the outrigger motor.

9. The mobile hydraulic tire crane according to claim 7, characterized in that: The mobile hydraulic tire crane also includes a central swivel joint, which is arranged on the hydraulic oil pipe between the hydraulic oil pump and the travel motor and the outrigger motor.

10. The mobile hydraulic tire crane according to claim 5, characterized in that: It also includes a connecting sleeve, a key, a first damping plate and a second damping plate; Among them, the rotating shaft of the motor of the mobile hydraulic tire crane power system and the oil pump shaft of the hydraulic oil pump are both provided with grooves; the inner walls at both ends of the connecting sleeve are respectively provided with grooves corresponding to the grooves of the rotating shaft and the grooves of the oil pump shaft, and the grooves of the connecting sleeve respectively form key grooves with the grooves of the rotating shaft and the grooves of the oil pump shaft, and the keys are arranged inside the key grooves; the first shock-absorbing plate is arranged on one side of the motor of the mobile hydraulic tire crane power system, and the second shock-absorbing plate is arranged on one side of the hydraulic oil pump.

Images