Hydraulic power unit with overload protection

Abstract

The invention discloses a hydraulic power unit with overload protection, and relates to the technical field of hydraulic equipment, the hydraulic power unit comprises a hydraulic power unit mechanism, an overload protection mechanism is arranged on the hydraulic power unit mechanism, and a protection mechanism is arranged on the outer side of the hydraulic power unit mechanism. By changing the included angle between the valve and the flowing direction of hydraulic oil, the passing area of the hydraulic oil is controlled, so that the flow of the hydraulic oil is adjusted, and the purpose of accurately adjusting the flow is achieved by changing the through-flow area of the notch. The pressure of the hydraulic power unit can be quickly reacted and adjusted, the operation efficiency can be improved, meanwhile, the safety is guaranteed, the overflow valve can be conveniently connected and installed by connecting the butt joint base through the connecting base, stable butt joint and sealing of all components are guaranteed, and the service life of the hydraulic power unit is prolonged. When the system pressure exceeds a set value, the overflow valve is opened, part of the hydraulic oil flows back to the oil tank through the overflow valve, and the system pressure is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic equipment, and in particular to a hydraulic power unit with overload protection. Background Art

[0002] As a common power source, hydraulic power units are widely used in many fields such as industrial production and engineering machinery. In actual working processes, hydraulic power units often face various complex working conditions. When the load suddenly increases or an abnormal situation occurs, the pressure inside the hydraulic system will rise sharply. If the pressure exceeds the tolerance limit of the system components, it will cause damage to key components such as hydraulic pumps and hydraulic cylinders, which will not only affect the normal operation of the equipment and increase maintenance costs, but may also cause safety accidents.

[0003] In the prior art, for example, the "hydraulic power unit" with the patent application number CN201480046563.2 includes a rear surface and a front surface separated from each other, and includes an air inlet and an air outlet, wherein the air inlet is configured to receive air into the hydraulic power unit, and the air outlet is configured to discharge the air received into the hydraulic power unit. The hydraulic power unit also includes a control device configured to provide a user interface. The control device and the air inlet are located on the front surface, and the air outlet is located on the rear surface. A coupling for the hydraulic power unit is configured to connect the drive shaft of the hydraulic power unit to the pump shaft of a hydraulic pump, and the coupling includes a first hole configured to accommodate the drive shaft, a second hole configured to accommodate the pump shaft, and a hub configured to be accommodated in a fan. The hub is configured to be fixedly connected to the fan so that the fan is driven by the drive shaft.

[0004] Although some existing hydraulic power units are also equipped with some protection measures, most of them have problems such as slow response speed and low protection accuracy, and are unable to effectively cope with complex and changeable overload conditions, resulting in dangerous overload problems when the hydraulic power unit is used. In view of the above problems, a hydraulic power unit with overload protection is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a hydraulic power unit with overload protection to solve the problems of slow response speed and low protection accuracy in the operation of the prior art proposed in the above background technology, and the inability to effectively cope with complex and changeable overload conditions, resulting in the danger of overload when the hydraulic power unit is used.

[0006] To achieve the above object, the present invention provides the following technical solutions: a hydraulic power unit with overload protection, comprising a hydraulic power unit mechanism, an overload protection mechanism is arranged on the hydraulic power unit mechanism, a protection mechanism is arranged on the outer side of the hydraulic power unit mechanism, the hydraulic power unit mechanism comprises a hydraulic pump, and a control valve group is arranged on the top of the hydraulic pump;

[0007] The overload protection mechanism includes two oil outlet pipes, a micro pressure sensor is arranged on the side of the oil outlet pipe, a connecting line is fixedly connected to the outer side of the micro pressure sensor, one end of the connecting line is connected to a sensor module, the sensor modules are all connected to one side of the control valve group, one end of the oil outlet pipe is connected to the hydraulic pump, the other end of the oil outlet pipe is threadedly connected to an extension pipe, a plurality of hydraulic telescopic rods are evenly distributed in the circumferential direction inside the extension pipe, the output end of the hydraulic telescopic rod is movably connected to a flow regulating blade, a flow regulating disk is fixedly installed on the inner wall of the extension pipe, and the flow regulating blades are movably installed on the flow regulating disk.

[0008] Preferably, the protection mechanism comprises a protection frame, and a plurality of protection strips are evenly distributed on the protection frame.

[0009] Preferably, mounting seats are symmetrically arranged at the four inner corners of the protective frame, a damping buffer rod is connected to the side of the mounting seat, and a buffer spring is arranged on the outer wall of the damping buffer rod.

[0010] Preferably, a buffer spring is symmetrically arranged on one side of the mounting seat, and the buffer spring is symmetrically arranged on the outer side of the buffer spring.

[0011] Preferably, one end of the damping buffer rod is fixedly connected to a sliding seat, and one end of the buffer spring sheet is fixedly connected to a side surface of the sliding seat.

[0012] Preferably, a sliding rail is slidably connected to the outer side of the sliding seat, a sliding groove is provided on one side of the sliding rail, and the sliding seat is slidably connected to the inner side of the sliding groove.

[0013] Preferably, a connecting ring is fixedly installed on the inner wall of the extension tube, and a plurality of first rotating seats are evenly distributed on the inner wall of the connecting ring along the circumferential direction. One end of the hydraulic telescopic rod is connected to the first rotating seat, and the other end of the hydraulic telescopic rod is connected to the second rotating seat, and the second rotating seat is installed on the side of the flow regulating blade.

[0014] Preferably, a plurality of flow regulating grooves are evenly opened on the side of the flow regulating disk, and rotating shafts are arranged on both sides of the flow regulating blades away from the second rotating seat. A rotating groove is arranged on the inner side of the flow regulating groove, and the rotating movable connection is connected to the inner side of the rotating groove. The top of the extension tube is fixedly connected to a connecting seat, and the top of the connecting seat is connected to a docking seat. An overflow valve is installed on the top of the docking seat, and the side of the overflow valve is fixedly connected to the return oil pipe.

[0015] Preferably, a motor is provided on the top of the hydraulic pump, and a start switch is provided on the side of the motor.

[0016] Preferably, a pressure gauge is connected to the side of the hydraulic pump, an oil tank is provided at the bottom of the hydraulic pump, and a refueling port and an oil return port are provided at the top of the oil tank.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, the flow rate of the hydraulic oil is adjusted by changing the angle between the flow direction of the hydraulic oil and the passing area of ​​the hydraulic oil. By changing the flow area of ​​the notch, the purpose of accurately adjusting the flow rate is achieved. It is beneficial to quickly respond to and adjust the pressure of the hydraulic power unit, which is beneficial to improve the efficiency of operation and ensure safety. The connection seat is connected to the docking seat to facilitate the connection and installation of the overflow valve, ensure the stable docking and sealing between the components, so that the hydraulic oil can flow according to the set path. When the system pressure exceeds the set value, the overflow valve opens, and part of the hydraulic oil flows back to the oil tank through the overflow valve to reduce the system pressure and play a role in overload protection. The connection between the return oil pipe and the external pipeline facilitates the guidance of the hydraulic oil after passing through the overflow valve or the actuator back to the oil tank, so that the hydraulic oil can be recycled.

[0019] 2. In the present invention, when the oil tank is subjected to vibration or impact, the damping buffer rod can consume the vibration energy through the viscous resistance of the damping medium, reduce the vibration amplitude of the oil tank and the equipment, and prevent the oil tank and the equipment from being damaged due to severe vibration. The buffer spring is used in conjunction with the damping buffer rod and is sleeved on the outside of the damping buffer rod. When the oil tank is impacted, the buffer spring first undergoes elastic deformation, absorbs part of the impact energy, and plays a preliminary buffering role. As the impact energy continues to act, the damping buffer rod begins to play a role, working in conjunction with the buffer spring to further consume energy and reduce the impact of the impact on the oil tank. The buffer spring can effectively improve the vibration resistance of the equipment and ensure the normal use of the oil tank. The buffering and shock absorbing capacity of the equipment is enhanced, and a dual buffering mechanism is formed with the buffer spring, which can more effectively cope with different degrees of impact and vibration. The sliding seat cooperates with the sliding groove on the inner side of the sliding rail to provide a sliding adjustment function during the buffering process, which is conducive to ensuring that the buffer assembly has a buffering activity space and ensures the amplitude of the activity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of a hydraulic power unit with overload protection according to the present invention;

[0021] Figure 2 For the present invention Figure 1 A is an enlarged structural diagram;

[0022] Figure 3 This is a schematic structural diagram from another angle of a hydraulic power unit with overload protection according to the present invention;

[0023] Figure 4 It is a partial structural schematic diagram of a hydraulic power unit with overload protection according to the present invention;

[0024] Figure 5 It is a partial structural schematic diagram of a hydraulic power unit with overload protection of the present invention;

[0025] Figure 6 For the present invention Figure 5 The enlarged structural diagram at B in FIG.

[0026] Figure 7 It is a structural schematic diagram of a protection mechanism of a hydraulic power unit with overload protection according to the present invention;

[0027] Figure 8 For the present invention Figure 7 The enlarged structural diagram at B in FIG.

[0028] In the figure:

[0029] 1. Hydraulic power unit mechanism; 101. Motor; 102. Start switch; 103. Hydraulic pump; 104. Pressure gauge; 105. Control valve group; 106. Oil filling port; 107. Oil return port; 108. Oil tank; 2. Overload protection mechanism; 201. Oil outlet pipe; 202. Micro pressure sensor; 203. Connection line; 204. Sensor module; 205. Extension tube; 206. Connection ring; 207. First rotating seat; 208. Hydraulic telescopic rod ; 209, second rotating seat; 210, flow regulating blade; 211, flow regulating disk; 212, flow regulating groove; 213, connecting seat; 214, docking seat; 215, overflow valve; 216, return oil pipe; 3, protection mechanism; 301, protection frame; 302, protection strip; 303, mounting seat; 304, damping buffer rod; 305, buffer spring; 306, buffer spring; 307, sliding seat; 308, sliding rail; 309, sliding groove. DETAILED DESCRIPTION

[0030] 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 implementation regulations described 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.

[0031] Example 1: Figure 1-Figure 8 As shown, the present invention provides a technical solution: a hydraulic power unit with overload protection, comprising a hydraulic power unit mechanism 1, an overload protection mechanism 2 is arranged on the hydraulic power unit mechanism 1, a protection mechanism 3 is arranged on the outside of the hydraulic power unit mechanism 1, the hydraulic power unit mechanism 1 comprises a hydraulic pump 103, a control valve group 105 is arranged on the top of the hydraulic pump 103, a motor 101 is arranged on the top of the hydraulic pump 103, a start switch 102 is arranged on the side of the motor 101, a pressure gauge 104 is connected to the side of the hydraulic pump 103, an oil tank 108 is arranged at the bottom of the hydraulic pump 103, and a refueling port 106 and an oil return port 107 are arranged on the top of the oil tank 108;

[0032] The overload protection mechanism 2 includes two oil outlet pipes 201, and a micro pressure sensor 202 is arranged on the side of the oil outlet pipe 201. A connecting line 203 is fixedly connected to the outer side of the micro pressure sensor 202, and one end of the connecting line 203 is connected to a sensor module 204. The sensor modules 204 are all connected to one side of the control valve group 105. One end of the oil outlet pipe 201 is connected to the hydraulic pump 103, and the other end of the oil outlet pipe 201 is threadedly connected to an extension pipe 205. A plurality of hydraulic telescopic rods 208 are evenly distributed inside the extension pipe 205 along the circumferential direction. The output end of the hydraulic telescopic rod 208 is movably connected to a flow regulating blade 210. A flow regulating disk 211 is fixedly installed on the inner wall of the extension pipe 205, and the flow regulating blades 210 are all movably installed on the flow regulating disk 211.

[0033] In this embodiment, the motor 101 serves as the power source of the entire hydraulic power unit. The motor 101 converts electrical energy into mechanical energy to provide continuous power for the operation of the hydraulic pump. The high-speed rotation of the motor 101 drives the rotor and other components inside the hydraulic pump to achieve the oil suction and oil pressure process of the hydraulic oil, thereby establishing the pressure required by the hydraulic system. In the integrated structure, the motor 101 is directly connected to the hydraulic pump. This connection method reduces the connection gap and energy loss between the transmission components and improves the power transmission efficiency.

[0034] The start switch 102 is a key component for controlling the start and stop of the motor. The operator turns on or off the power supply circuit of the motor by operating the start switch 102, thereby controlling the operation and stop of the hydraulic power unit. The hydraulic pump 103 is one of the core components of the hydraulic power unit, and its main function is to convert mechanical energy into hydraulic energy. Driven by the motor 101, the hydraulic pump 103 sucks hydraulic oil from the oil tank 108, and outputs the hydraulic oil after pressurization through its own mechanical structure, providing hydraulic oil with a certain pressure and flow rate for the actuators in the hydraulic system, driving them to complete various work tasks. The pressure gauge 104 is used to monitor the pressure in the hydraulic system in real time. It is connected to the hydraulic circuit to convert the pressure of the hydraulic oil into the mechanical displacement of the pointer, which is intuitively displayed on the dial. The operator can understand the working status of the hydraulic system by observing the reading of the pressure gauge 104, and judge whether the system is in the normal pressure range. Once the pressure fluctuates abnormally, such as too high or too low, corresponding measures can be taken in time. The control valve group 105 is composed of a plurality of control valves with different functions, and the flow direction, pressure and flow rate of the hydraulic oil can be accurately controlled by the control valve group 105. The directional control valve is used to change the flow direction of the hydraulic oil to realize the forward and reverse rotation of the actuator or the switching of different action directions; the pressure control valve is used to adjust and stabilize the pressure of the hydraulic system to prevent the system from being damaged by excessive pressure; the flow control valve is used to control the flow rate of the hydraulic oil, thereby adjusting the movement speed of the actuator. In the integrated structure of the present invention, the control valve group is reasonably arranged in the integrated pipeline of the hydraulic circuit, and works in coordination with other components to ensure the efficient and stable operation of the entire hydraulic system. The refueling port 106 is the entrance for adding hydraulic oil to the oil tank 108. After the hydraulic power unit is used for the first time or the hydraulic oil is lost for various reasons, the hydraulic oil needs to be replenished through the refueling port 106 to ensure that there is enough hydraulic oil reserve in the oil tank 108 to maintain the normal operation of the hydraulic system. The refueling port 106 is usually equipped with a sealing device to prevent foreign matter such as dust and impurities from entering the oil tank 108, contaminating the hydraulic oil and affecting the system performance. The function of the oil return port 107 is to return the hydraulic oil after completing the work task to the oil tank 108. During the operation of the hydraulic system, the hydraulic oil flowing out of the actuator will pass through the oil return pipe and return to the oil tank 108 through the oil return port 107. The oil return port 107 is equipped with a filter to perform preliminary filtration on the refluxed hydraulic oil to remove impurities therein, ensure the cleanliness of the hydraulic oil, extend the service life of various components of the hydraulic system, and also help maintain the stable operation of the system. The oil tank 108 is a container for storing hydraulic oil and has many important functions. Provide sufficient hydraulic oil reserves for the hydraulic system to ensure that during the operation of the system, the hydraulic pump 103 always has oil to absorb to meet the system's demand for hydraulic oil flow.Secondly, the oil tank 108 also plays a role in heat dissipation. When the hydraulic system is working, the hydraulic oil will generate heat due to friction, pressure changes and other reasons. The larger surface area of ​​the oil tank 108 can dissipate part of the heat to the surrounding environment to prevent the hydraulic oil temperature from being too high, affecting the system performance and oil life. In addition, some partitions and other structures may be set inside the oil tank 108 to promote the precipitation of impurities in the hydraulic oil and improve the cleanliness of the oil. It is connected to the side of the hydraulic pump 103 through the oil outlet pipe 201, which is used to deliver the high-pressure hydraulic oil output by the hydraulic pump to each actuator of the hydraulic system to achieve the function of hydraulic oil output. A micro pressure sensor 202 is provided on the oil outlet pipe 201, which can monitor the pressure of the internal hydraulic oil in real time, and convert the pressure signal into an electrical signal by using the principle of thin film induction, and connect it to the sensor module 204 through the connecting line 203. The sensor module 204 receives the signal from the micro pressure sensor 202, processes, analyzes and amplifies it, and then transmits the processed signal to the control valve group 105 as a basis for system judgment and control, so as to facilitate subsequent processing and judgment of the system. Whether the system is overloaded, when the system determines that it is overloaded, the extension tube 205 is used to extend and connect, and the extension tube 205 is provided with a connecting ring 206 inside, which is convenient for connecting and supporting the hydraulic telescopic rod 208, and cooperates with the first rotating seat 207 and the second rotating seat 209 to be arranged at both ends of the hydraulic telescopic rod 208, so as to provide a rotating effect during the telescopic adjustment process. The flow regulating groove 212 on the flow regulating disk 211 cooperates with the flow regulating blade 210. When the blade rotates, by changing the angle between itself and the flow direction of the hydraulic oil, the passing area of ​​the hydraulic oil is controlled, thereby adjusting the flow of the hydraulic oil, and the flow area of ​​the notch is changed to achieve the purpose of accurately adjusting the flow. It is conducive to quickly responding to the pressure of the hydraulic power unit, which is conducive to improving the efficiency of operation and ensuring safety at the same time. Utilizing the connecting seat 213 to connect the docking seat 214 facilitates the connection and installation of the relief valve 215, ensures stable docking and sealing between the components, and enables the hydraulic oil to flow along the set path. When the system pressure exceeds the set value, the relief valve 215 opens, and part of the hydraulic oil flows back to the oil tank 108 through the relief valve 215, thereby reducing the system pressure and playing a role in overload protection. The return oil pipe 216 is connected to the external pipeline to facilitate guiding the hydraulic oil after passing through the relief valve 215 or the actuator back to the oil tank 108, so that the hydraulic oil can be recycled.

[0035] Example 2: Figure 7 and Figure 8As shown, the protection mechanism 3 includes a protection frame 301, on which a number of protection strips 302 are evenly distributed, mounting seats 303 are symmetrically arranged at the four inner corners of the protection frame 301, a damping buffer rod 304 is connected to the side of the mounting seat 303, a buffer spring 305 is arranged on the outer wall of the damping buffer rod 304, a buffer spring 306 is symmetrically arranged on one side of the mounting seat 303, and the buffer spring 306 is symmetrically arranged on the outer side of the buffer spring 305, one end of the damping buffer rod 304 is fixedly connected to a sliding seat 307, one end of the buffer spring 306 is fixedly connected to the side of the sliding seat 307, a sliding rail 308 is slidably connected to the outer side of the sliding seat 307, a sliding groove 309 is opened on one side of the sliding rail 308, and the sliding seat 307 is slidably connected to the inner side of the sliding groove 309.

[0036] In this embodiment, the protection frame 301 is installed on the outside of the oil tank 108 to form an enveloping protection for the oil tank 108. It can prevent external foreign objects from directly hitting the oil tank 108, and prevent the oil tank 108 from being damaged due to collision. The protection strip 302 can play a buffering role through its own elastic deformation, reducing the impact of the impact on the oil tank 108. The mounting seat 303 is used to install the damping buffer rod 304, the buffer spring 305 and the buffer spring 306 on the inner side of the protection frame 301. The damping buffer rod 304 contains silicone damping medium. When the oil tank 108 is vibrated or impacted, the damping buffer rod 304 can consume the vibration energy through the viscous resistance of the damping medium, reduce the vibration amplitude of the oil tank 108 and the equipment, and avoid the oil tank 108 and the equipment from being damaged due to severe vibration. The buffer spring 305 is used in conjunction with the damping buffer rod 304 and is sleeved on the outside of the damping buffer rod 304. When the oil tank 108 is impacted, the buffer spring 305 first undergoes elastic deformation, absorbs part of the impact energy, and plays a preliminary buffering role. As the impact energy continues to act, the damping buffer rod 304 begins to work, working in conjunction with the buffer spring 305 to further consume energy and mitigate the impact on the oil tank 108. The buffer spring 306 can effectively improve the vibration resistance of the equipment and ensure the normal use of the oil tank 108. The buffering and shock absorbing capacity of the equipment is enhanced, and a double buffering mechanism is formed with the buffer spring 305, which can more effectively cope with different degrees of impact and vibration. The sliding seat 307 cooperates with the sliding groove 309 on the inner side of the sliding rail 308 to provide a sliding adjustment function during the buffering process, which helps to ensure that the buffer component has a buffering activity space and ensures the range of activity.

[0037] Example 3: Figure 2 , Figure 5 and Figure 6As shown, a connecting ring 206 is fixedly installed on the inner wall of the extension tube 205, and a plurality of first rotating seats 207 are evenly distributed on the inner wall of the connecting ring 206 along the circumferential direction. One end of the hydraulic telescopic rod 208 is connected to the first rotating seat 207, and the other end of the hydraulic telescopic rod 208 is connected to the second rotating seat 209. The second rotating seat 209 is installed on the side of the flow regulating blade 210. A plurality of flow regulating grooves 212 are evenly opened on the side of the flow regulating disk 211. The flow regulating blade 210 is provided with a rotating shaft on both sides away from the second rotating seat 209. A rotating groove is provided on the inner side of the flow regulating groove 212, and the rotating movable connection is connected to the inner side of the rotating groove. A connecting seat 213 is fixedly connected to the top of the extension tube 205, and a docking seat 214 is connected to the top of the connecting seat 213. An overflow valve 215 is installed on the top of the docking seat 214, and the side of the overflow valve 215 is fixedly connected to the return oil pipe 216.

[0038] In this embodiment, the connecting ring 206 serves to connect the hydraulic telescopic rod 208, and cooperates with the first rotating seat 207 and the second rotating seat 209 to ensure that the hydraulic telescopic rod 208 can provide angle adjustment during the telescopic rotation process, thereby ensuring the range of activity. Through the cooperation between the flow regulating groove 212 and the flow regulating blade 210, the flow regulation effect is achieved by changing its flow area.

[0039] In the present invention, when the hydraulic power unit with overload protection is in use, first, the motor 101 is used as the power source of the entire hydraulic power unit. The motor 101 converts electrical energy into mechanical energy to provide continuous power for the operation of the hydraulic pump. Through the high-speed rotation of the motor 101, the rotor and other components inside the hydraulic pump are driven to realize the oil suction and oil pressure process of the hydraulic oil, thereby establishing the pressure required by the hydraulic system. In the integrated structure, the motor 101 is directly connected to the hydraulic pump. This connection method reduces the connection gap and energy loss between the transmission components and improves the power transmission efficiency. The hydraulic pump 103 is a key component for controlling the start and stop of the motor. The operator turns on or off the power supply circuit of the motor by operating the start switch 102, thereby controlling the operation and stop of the hydraulic power unit. The hydraulic pump 103 is one of the core components of the hydraulic power unit, and its main function is to convert mechanical energy into hydraulic energy. Driven by the motor 101, the hydraulic pump 103 sucks hydraulic oil from the oil tank 108, and outputs the hydraulic oil after pressurization through its own mechanical structure, providing hydraulic oil with a certain pressure and flow rate for the actuators in the hydraulic system, driving them to complete various work tasks. The pressure gauge 104 is used to monitor the pressure in the hydraulic system in real time. It is connected to the hydraulic circuit, converts the pressure of the hydraulic oil into the mechanical displacement of the pointer, and displays it intuitively on the dial. The operator can understand the working state of the hydraulic system by observing the reading of the pressure gauge 104, and judge whether the system is in the normal pressure range. Once the pressure fluctuates abnormally, such as too high or too low, corresponding measures can be taken in time. The control valve group 105 is composed of a plurality of control valves with different functions, and the flow direction, pressure and flow rate of the hydraulic oil can be accurately controlled by the control valve group 105. The directional control valve is used to change the flow direction of the hydraulic oil to realize the forward and reverse rotation of the actuator or the switching of different action directions; the pressure control valve is used to adjust and stabilize the pressure of the hydraulic system to prevent the system from being damaged by excessive pressure; the flow control valve is used to control the flow of the hydraulic oil, thereby adjusting the movement speed of the actuator. In the integrated structure of the present invention, the control valve group is rationally arranged in the integrated pipeline of the hydraulic circuit, and works in coordination with other components to ensure efficient and stable operation of the entire hydraulic system. The refueling port 106 is the entrance for adding hydraulic oil to the oil tank 108. After the hydraulic power unit is used for the first time or the hydraulic oil is lost for various reasons, it is necessary to replenish the hydraulic oil through the refueling port 106 to ensure that there is enough hydraulic oil reserve in the oil tank 108 to maintain the normal operation of the hydraulic system. The refueling port 106 is usually equipped with a sealing device to prevent foreign matter such as dust and impurities from entering the oil tank 108, contaminating the hydraulic oil and affecting the system performance. The function of the return oil port 107 is to return the hydraulic oil after completing the work task to the oil tank 108. During the operation of the hydraulic system, the hydraulic oil flowing out of the actuator will pass through the return oil pipeline and return to the oil tank 108 through the return oil port 107.The oil return port 107 is equipped with a filter to perform preliminary filtration on the refluxed hydraulic oil, remove impurities therein, ensure the cleanliness of the hydraulic oil, extend the service life of each component of the hydraulic system, and also help maintain the stable operation of the system. The oil tank 108 is a container for storing hydraulic oil and has multiple important functions. It provides sufficient hydraulic oil reserves for the hydraulic system to ensure that during the operation of the system, the hydraulic pump 103 always has oil to absorb to meet the system's demand for hydraulic oil flow. Secondly, the oil tank 108 also plays a role in heat dissipation. When the hydraulic system is working, the hydraulic oil will generate heat due to friction, pressure changes and other reasons. The larger surface area of ​​the oil tank 108 can dissipate part of the heat to the surrounding environment to prevent the hydraulic oil temperature from being too high and affecting the system performance and oil life. In addition, some structures such as partitions may be set inside the oil tank 108 to promote the precipitation of impurities in the hydraulic oil and improve the cleanliness of the oil. The oil outlet pipe 201 is connected to the side of the hydraulic pump 103, and is used to deliver the high-pressure hydraulic oil output by the hydraulic pump to each actuator of the hydraulic system to achieve the function of hydraulic oil output. The oil outlet pipe 201 is provided with a micro pressure sensor 202, which can monitor the pressure of the internal hydraulic oil in real time. The pressure signal is converted into an electrical signal by using the principle of thin film induction, and is connected to the sensor module 204 through the connecting line 203. The sensor module 204 receives the signal from the micro pressure sensor 202, processes, analyzes and amplifies it, and then transmits the processed signal to the control valve group 105 as a basis for system judgment and control, so as to facilitate subsequent processing and judgment of the system. Whether the system is overloaded, when the system determines that it is overloaded, the extension tube 205 is used to extend and connect, and the extension tube 205 is provided with a connecting ring 206 inside, which is convenient for connecting and supporting the hydraulic telescopic rod 208, and cooperates with the first rotating seat 207 and the second rotating seat 209 to be arranged at both ends of the hydraulic telescopic rod 208, so as to provide a rotating effect during the telescopic adjustment process. The flow regulating groove 212 on the flow regulating disk 211 cooperates with the flow regulating blade 210. When the blade rotates, by changing the angle between itself and the flow direction of the hydraulic oil, the passing area of ​​the hydraulic oil is controlled, thereby adjusting the flow of the hydraulic oil, and the flow area of ​​the notch is changed to achieve the purpose of accurately adjusting the flow. It is conducive to quickly responding to the pressure of the hydraulic power unit, which is conducive to improving the efficiency of operation and ensuring safety at the same time.The connection seat 213 is used to connect the docking seat 214 to facilitate the connection and installation of the relief valve 215, ensuring the stable docking and sealing between the components, so that the hydraulic oil can flow along the set path. When the system pressure exceeds the set value, the relief valve 215 opens, and part of the hydraulic oil returns to the oil tank 108 through the relief valve 215, reducing the system pressure and playing a role in overload protection. The return oil pipe 216 is connected to the external pipeline to facilitate the guidance of the hydraulic oil after passing through the relief valve 215 or the actuator back to the oil tank 108, so that the hydraulic oil can be recycled. The protective frame 301 is installed on the outside of the oil tank 108 to form an enclosing protection for the oil tank 108. It can block external foreign objects from directly hitting the oil tank 108, and prevent the oil tank 108 from being damaged due to collision. The protective strip 302 can play a buffering role through its own elastic deformation, reducing the impact of the impact on the oil tank 108. The mounting seat 303 is used to install the damping buffer rod 304, the buffer spring 305 and the buffer spring 306 on the inner side of the protective frame 301. The damping buffer rod 304 contains silicone oil damping medium. When the oil tank 108 is vibrated or impacted, the damping buffer rod 304 can consume the vibration energy through the viscous resistance of the damping medium, reduce the vibration amplitude of the oil tank 108 and the equipment, and avoid the oil tank 108 and the equipment from being damaged due to severe vibration. The buffer spring 305 is used in conjunction with the damping buffer rod 304 and is sleeved on the outside of the damping buffer rod 304. When the oil tank 108 is impacted, the buffer spring 305 first undergoes elastic deformation, absorbs part of the impact energy, and plays a preliminary buffering role. As the impact energy continues to act, the damping buffer rod 304 begins to work, working in conjunction with the buffer spring 305 to further consume energy and mitigate the impact on the oil tank 108. The buffer spring 306 can effectively improve the vibration resistance of the equipment and ensure the normal use of the oil tank 108. The buffering and shock absorbing capacity of the equipment is enhanced, and a double buffering mechanism is formed with the buffer spring 305, which can more effectively cope with different degrees of impact and vibration. The sliding seat 307 cooperates with the sliding groove 309 on the inner side of the sliding rail 308 to provide a sliding adjustment function during the buffering process, which helps to ensure that the buffer component has a buffering activity space and ensures the range of activity.

[0040] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic power unit with overload protection, comprising a hydraulic power unit mechanism (1), characterized in that: The hydraulic power unit mechanism (1) is provided with an overload protection mechanism (2), the outer side of the hydraulic power unit mechanism (1) is provided with a protection mechanism (3), the hydraulic power unit mechanism (1) comprises a hydraulic pump (103), and the top of the hydraulic pump (103) is provided with a control valve group (105); The overload protection mechanism (2) comprises two oil outlet pipes (201), a micro pressure sensor (202) is arranged on the side of the oil outlet pipe (201), a connection line (203) is fixedly connected to the outside of the micro pressure sensor (202), one end of the connection line (203) is connected to a sensor module (204), the sensor module (204) is connected to one side of the control valve group (105), and one end of the oil outlet pipe (201) is connected to the hydraulic pump (105). 03), the other end of the oil outlet pipe (201) is threadedly connected to an extension pipe (205), the interior of the extension pipe (205) is evenly distributed with a plurality of hydraulic telescopic rods (208) along the circumferential direction, the output end of the hydraulic telescopic rod (208) is movably connected to a flow regulating blade (210), the inner wall of the extension pipe (205) is fixedly mounted with a flow regulating disk (211), and the flow regulating blades (210) are movably mounted on the flow regulating disk (211).

2. The hydraulic power unit with overload protection according to claim 1, characterized in that: The protection mechanism (3) comprises a protection frame (301), and a plurality of protection strips (302) are evenly distributed on the protection frame (301).

3. The hydraulic power unit with overload protection according to claim 2, characterized in that: The four inner corners of the protection frame (301) are symmetrically provided with mounting seats (303), the side surfaces of the mounting seats (303) are connected with damping buffer rods (304), and the outer wall of the damping buffer rods (304) is provided with buffer springs (305).

4. The hydraulic power unit with overload protection according to claim 3, characterized in that: A buffer spring (306) is symmetrically arranged on one side of the mounting seat (303), and the buffer spring (306) is symmetrically arranged on the outer side of the buffer spring (305).

5. The hydraulic power unit with overload protection according to claim 4, characterized in that: One end of the damping buffer rod (304) is fixedly connected to a sliding seat (307), and one end of each of the buffer spring sheets (306) is fixedly connected to a side surface of the sliding seat (307).

6. The hydraulic power unit with overload protection according to claim 5, characterized in that: The outer side of the sliding seat (307) is slidably connected to a sliding rail (308), one side of the sliding rail (308) is provided with a sliding groove (309), and the sliding seat (307) is slidably connected to the inner side of the sliding groove (309).

7. The hydraulic power unit with overload protection according to claim 1, characterized in that: A connecting ring (206) is fixedly mounted on the inner wall of the extension tube (205); a plurality of first rotating seats (207) are evenly distributed on the inner wall of the connecting ring (206) along the circumferential direction; one end of the hydraulic telescopic rod (208) is connected to the first rotating seat (207); the other end of the hydraulic telescopic rod (208) is connected to a second rotating seat (209); and the second rotating seat (209) is mounted on the side of the flow regulating blade (210).

8. The hydraulic power unit with overload protection according to claim 7, characterized in that: A plurality of flow regulating grooves (212) are evenly provided on the side of the flow regulating disk (211); rotating shafts are provided on both sides of the flow regulating blade (210) away from the second rotating seat (209); a rotating groove is provided on the inner side of the flow regulating groove (212); the rotating movable part is connected to the inner side of the rotating groove; the top of the extension tube (205) is fixedly connected to a connecting seat (213); the top of the connecting seat (213) is connected to a docking seat (214); a relief valve (215) is installed on the top of the docking seat (214); and the side of the relief valve (215) is fixedly connected to an oil return pipe (216).

9. The hydraulic power unit with overload protection according to claim 1, characterized in that: A motor (101) is arranged on the top of the hydraulic pump (103), and a start switch (102) is arranged on the side of the motor (101).

10. The hydraulic power unit with overload protection according to claim 9, characterized in that: A pressure gauge (104) is connected to the side of the hydraulic pump (103), an oil tank (108) is arranged at the bottom of the hydraulic pump (103), and a refueling port (106) and an oil return port (107) are arranged at the top of the oil tank (108).

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