Blade angle adjusting device for hydraulic machinery

Abstract

The utility model discloses a hydraulic machinery blade angle adjusting device, which relates to the technical field of hydraulic machinery and comprises an oil cylinder, an oil tank, a direct current motor bidirectional pump component and a hydraulic control valve component. The oil cylinder is installed at the top end of a hydraulic machine spindle through a connecting flange, and a piston rod capable of reciprocating is arranged in the oil cylinder and used for being connected with a blade adjusting rod of a hydraulic machine through an external thread flange. The oil tank is mounted at the top of the oil cylinder through a mounting plate and internally used for storing hydraulic oil; the direct-current motor two-way pump assembly is mounted on the mounting plate, electrically connected with a central control system of the hydraulic machinery and communicated with the oil tank; the hydraulic control valve assembly is installed on the installation plate and forms an oil loop together with the oil cylinder, the oil tank and the direct-current motor two-way pump assembly. Through the arrangement, the angles of the blades can be adjusted to adapt to different water flow conditions, and then the working efficiency and stability of the hydraulic machine can be improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic machinery technology, and in particular to a hydraulic machinery blade angle adjustment device. Background Technology

[0002] Pumps and turbines are two common types of hydraulic machinery, both possessing rotatable blades. For example, pumps have pump blades, and turbines have turbine blades. The blade angle is one of the key factors affecting turbine performance. If the blade angle is inappropriate, changes in head and guide vane opening will lead to low turbine efficiency or even malfunction. Therefore, adjusting the blade angle is one of the important methods to improve turbine efficiency.

[0003] Traditional water turbines typically have fixed blade angles (fixed-blade turbines), making it difficult for them to achieve optimal performance under varying flow conditions (i.e., changes in head and flow rate). With technological advancements, adjustable-blade turbines (propeller turbines) have emerged as a key technology for improving turbine performance. By adjusting the blade angle to adapt to different flow conditions, the efficiency and stability of the turbine can be improved, enabling stable operation in various environments. In water pump operation, different application scenarios and operating conditions require different operating parameters. Traditional water pumps typically adjust their operating points by replacing different impellers or adjusting inlet and outlet valves, a method that is not only cumbersome but also inefficient.

[0004] Therefore, how to provide a hydraulic machinery blade angle adjustment device to improve the working efficiency and stability of hydraulic machinery is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a hydraulic machinery blade angle adjustment device that can improve the working efficiency and stability of hydraulic machinery.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A hydraulic machinery blade angle adjustment device, comprising:

[0008] The hydraulic cylinder is mounted on the top of the main shaft of the hydraulic machinery via a connecting flange. Inside the hydraulic cylinder is a reciprocating piston rod, which is used to connect to the blade adjusting rod of the hydraulic machinery via an external threaded flange.

[0009] The oil tank is mounted on top of the cylinder via a mounting plate and is used to store hydraulic oil.

[0010] The DC motor bidirectional pump assembly is mounted on the mounting plate and is electrically connected to the central control system of the hydraulic machinery. The DC motor bidirectional pump assembly is also connected to the oil tank.

[0011] The hydraulic control valve assembly, mounted on the mounting plate, together with the oil cylinder, oil tank, and DC motor bidirectional pump assembly, forms the oil circuit.

[0012] Preferably, the DC motor bidirectional pump assembly includes a motor and a bidirectional pump. The motor drives the bidirectional pump to work, and the bidirectional pump drives the hydraulic oil to circulate in the oil circuit. The oil inlet of the bidirectional pump is connected to the oil tank.

[0013] Preferably, the hydraulic control valve assembly includes: a valve block, and a plurality of threaded cartridge valves and two one-way throttle valves inserted into the valve block. The two one-way throttle valves are respectively connected to the two working ports of the cylinder. The one-way throttle valves are used to control the running speed of the piston rod. The valve block is also provided with a connector for connecting to the outlet port of the bidirectional pump.

[0014] Preferably, the threaded cartridge valve includes two check valves, two relief valves, and two pilot-operated check valves. The two check valves are used to maintain pressure and protect the bidirectional pump from hydraulic shock, while the two relief valves are used to control the highest pressure in the oil circuit to protect the safety of the oil circuit.

[0015] Preferably, the cylinder and the oil tank are both located in the middle of the mounting plate, and the DC motor bidirectional pump assembly and the hydraulic control valve assembly are located on the side of the mounting plate where the oil tank is mounted, and the DC motor bidirectional pump assembly and the hydraulic control valve assembly are symmetrical about the oil tank.

[0016] Preferably, the oil tank includes: a tank body, an oil tank cover, a sealing ring assembly, and several oil level observation windows. The tank body is rigidly connected to the center of the mounting plate by a stop bolt. A partition is provided at the bottom of the tank body to divide the oil tank into an oil suction area and an oil return area. The side wall of the oil tank is provided with an oil outlet port communicating with the oil suction area and an oil return port communicating with the oil return area. The oil outlet port is connected to the oil inlet port, and the oil return port is connected to the oil return port of the valve block. The oil tank cover is installed on the top of the tank body, the sealing ring assembly is installed between the tank body and the oil tank cover, and several oil level observation windows are spaced apart and evenly arranged along the axial direction of the tank body.

[0017] Preferably, the fuel tank cap has a through hole in the middle, and the top of the fuel tank cap is provided with a refueling pipe connected to the through hole. An air filter is installed inside the refueling pipe to prevent impurities from entering the fuel tank.

[0018] Preferably, the fuel tank cap engages with the fuel tank via two mutually perpendicular mating surfaces, and the sealing ring assembly includes a first sealing ring and a second sealing ring, which are respectively disposed on the two mating surfaces.

[0019] Preferably, the assembly also includes: a carbon brush holder, a carbon brush slip ring assembly, and a wire cover plate. The carbon brush holder is fixedly installed on the upper end cover of the hydraulic machinery. Both the carbon brush slip ring assembly and the wire cover plate are annular structures and are fitted around the outer periphery of the oil filling pipe. The top of the carbon brush holder is connected to the carbon brush slip ring assembly. The carbon brush slip ring assembly is connected to the motor via a cable, and the wire cover plate is used to protect the cable.

[0020] Preferably, the system also includes a laser displacement sensor and a feedback plate. The laser displacement sensor is connected to the middle of the carbon brush bracket via a laser displacement sensor mounting plate, and the feedback plate is mounted on an external threaded flange. The laser displacement sensor is capable of detecting the distance between itself and the feedback plate.

[0021] Compared to the aforementioned background technology, the present invention provides a hydraulic machinery blade angle adjustment device, comprising: a hydraulic cylinder, an oil tank, a DC motor bidirectional pump assembly, and a hydraulic control valve assembly; the hydraulic cylinder is mounted on the top of the hydraulic machinery main shaft via a connecting flange, and has a reciprocating piston rod inside, which is used to connect to the blade adjustment rod of the hydraulic machinery via an external threaded flange; the oil tank is mounted on the top of the hydraulic cylinder via a mounting plate, and is used to store hydraulic oil; the DC motor bidirectional pump assembly is mounted on the mounting plate, and is electrically connected to the central control system of the hydraulic machinery, and is connected to the oil tank; the hydraulic control valve assembly is mounted on the mounting plate, and together with the hydraulic cylinder, the oil tank, and the DC motor bidirectional pump assembly, forms an oil circuit.

[0022] Specifically, the blade angle adjustment device in this application is installed at the top of the main shaft of the hydraulic machinery via a connecting flange. The entire device rotates with the rotation of the main shaft, and its reciprocating motion via the piston rod in the oil cylinder drives the push-pull rod of the blade linkage mechanism of the hydraulic machinery through the external thread flange, thereby adjusting the blade angle. The DC motor bidirectional pump assembly is electrically connected to the central control system of the hydraulic machinery. Upon receiving a signal, it is energized and started, thereby drawing hydraulic oil from the oil tank and delivering it to the hydraulic control valve assembly for oil circuit guidance and switching. The hydraulic oil output from the hydraulic control valve assembly is delivered to the oil cylinder, thereby realizing the movement of the piston rod and thus adjusting the blade angle. This allows the hydraulic machinery to better adapt to changes in head and guide vane opening, significantly improving the working efficiency and stability of the hydraulic machinery. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the adjustment device structure provided in an embodiment of the present utility model;

[0025] Figure 2 A schematic diagram of the adjustment device with an outer cover provided in an embodiment of this utility model;

[0026] Figure 3 for Figure 2 A sectional view;

[0027] Figure 4 This is a schematic diagram of the hydraulic control valve assembly provided in an embodiment of the present utility model;

[0028] Figure 5 for Figure 4 Rear view;

[0029] Figure 6 Hydraulic schematic diagram of the hydraulic control valve assembly provided in this embodiment of the utility model;

[0030] Figure 7 This is a schematic diagram of the fuel tank structure provided in an embodiment of the present utility model;

[0031] Figure 8 This is a cross-sectional view of the fuel tank structure provided in an embodiment of the present utility model.

[0032] in:

[0033] 1-Cylinder, 1.1-Piston rod, 2-Connecting flange, 3-External threaded flange, 4-Oil tank, 4.1-Box body, 4.11-Baffle plate, 4.12-Oil suction area, 4.13-Oil return area, 4.2-Oil tank cover, 4.3-Oil level observation window, 4.4-Oil outlet port, 4.5-Oil return port, 4.6-Oil filling pipe, 4.7-Air filter, 4.8-First sealing ring, 4.9-Second sealing ring, 5-Mounting plate, 6-DC motor bidirectional pump assembly, 7-Hydraulic control valve assembly, 7.1-Valve block, 7.2-One-way throttle valve, 7.3-Connector, 7.4-One-way valve, 7.5-Relief valve, 7.6-Hydraulic one-way valve, 8-Carbon brush bracket, 9-Carbon brush slip ring assembly, 10-Cable cover plate, 11-Laser displacement sensor, 12-Feedback plate, 13-Laser displacement sensor mounting plate, 14-Protective cover; Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.

[0037] The purpose of this invention is to provide a hydraulic machinery blade angle adjustment device that can adapt to different water flow conditions by adjusting the blade angle, thereby improving the working efficiency and stability of the hydraulic machinery.

[0038] To achieve the above objectives, the present invention provides the following technical solution:

[0039] Please see Figures 1 to 8 This embodiment provides a hydraulic machinery blade angle adjustment device, including: a hydraulic cylinder 1, an oil tank 4, a DC motor bidirectional pump assembly 6, and a hydraulic control valve assembly 7; the hydraulic cylinder 1 is installed on the top of the hydraulic machinery main shaft via a connecting flange 2, and a reciprocating piston rod 1.1 is provided inside the hydraulic cylinder 1, which is used to connect to the blade adjustment rod of the hydraulic machinery via an external threaded flange 3; the oil tank 4 is installed on the top of the hydraulic cylinder 1 via a mounting plate 5, and is used to store hydraulic oil; the DC motor bidirectional pump assembly 6 is installed on the mounting plate 5, and is electrically connected to the central control system of the hydraulic machinery, and is connected to the oil tank 4; the hydraulic control valve assembly 7 is installed on the mounting plate 5, and together with the hydraulic cylinder 1, the oil tank 4, and the DC motor bidirectional pump assembly 6, forms an oil circuit.

[0040] Specifically, such as Figure 1 and Figure 3 As shown, in this embodiment, the angle adjustment device is connected from top to bottom to an oil tank 4, a mounting plate 5, and a cylinder 1. A DC motor bidirectional pump assembly 6 and a hydraulic control valve assembly 7 are also installed on the upper side of the mounting plate 5. Together with the oil tank 4 and the cylinder 1, they form an oil circuit, i.e., a hydraulic system. However, the oil tank 4, the hydraulic control valve assembly 7, and the DC motor bidirectional pump assembly 6 are independent of each other, and their disassembly and maintenance do not affect each other, making installation and maintenance very convenient. The DC motor bidirectional pump assembly 6 serves as the power source for the entire hydraulic system, providing the hydraulic oil with the power to flow in the circuit. The hydraulic control valve assembly 7 constitutes the circuit within the hydraulic system.

[0041] The bottom of the hydraulic cylinder 1 is rigidly connected to the top of the main shaft of the hydraulic machinery via the connecting flange 2. Since other components are all based on this, the oil tank 4, hydraulic cylinder 1, hydraulic control valve assembly 7, and DC motor bidirectional pump assembly 6 all rotate with the main shaft of the hydraulic machinery. In addition, in this embodiment, the piston rod 1.1 of the hydraulic cylinder 1 will reciprocate. It is connected to the push-pull rod of the connecting rod mechanism of the connecting blade via the external thread flange 3. That is to say, the blade angle can be adjusted by driving the piston rod 1.1 of the hydraulic cylinder 1 to move.

[0042] It should be noted that the cylinder 1, oil tank 4, hydraulic control valve assembly 7, and DC motor bidirectional pump assembly 6 in this application are all mounted on the mounting plate 5. While these components rotate together with the hydraulic machinery spindle, they are essentially cooled by natural air cooling, which avoids the oil temperature rise caused by placing the DC motor bidirectional pump assembly 6 inside the oil tank, thereby extending the service life of the vane adjustment device. This arrangement also prevents hydraulic oil from entering the DC motor bidirectional pump assembly 6 and reduces the difficulty of preventing oil leakage from the oil tank 4. In addition, this arrangement also makes it easy to disassemble the hydraulic control valve assembly 7 or the DC motor bidirectional pump assembly 6 when problems occur, allowing for maintenance of the vane angle adjustment device in less time.

[0043] Furthermore, in this embodiment, a protective cover can also be fitted over the entire device, specifically as follows: Figure 2 and Figure 3 As shown, the protective cover is bolted to the upper end cover of the hydraulic machinery. It does not move relative to the ground and can be installed and removed independently. The protective cover mainly serves a safety protection function to prevent workers from being injured by accidental contact with the rotating parts of the angle adjustment device during operation.

[0044] In summary, the blade angle adjustment device in this application is installed at the top of the main shaft of the hydraulic machinery via the connecting flange 2. The device rotates with the main shaft and reciprocates via the piston rod 1.1 in the cylinder 1, which in turn drives the push-pull rod of the blade linkage mechanism of the hydraulic machinery through the external threaded flange 3, thereby adjusting the blade angle. The DC motor bidirectional pump assembly 6 is electrically connected to the central control system of the hydraulic machinery. Upon receiving a signal, it is energized and starts, drawing hydraulic oil from the oil tank 4 and delivering it to the hydraulic control valve assembly 7 for oil circuit guidance and switching. The hydraulic oil output from the hydraulic control valve assembly 7 is then delivered to the cylinder 1, thereby actuating the piston rod 1.1 and adjusting the blade angle. This allows the hydraulic machinery to better adapt to water flow, significantly improving its working efficiency and stability.

[0045] Preferably, the DC motor bidirectional pump assembly 6 includes a motor and a bidirectional pump. The motor is electrically connected to the central control unit of the hydraulic machinery. Specifically, the motor is a DC motor and is integrated with the bidirectional pump. The motor is responsible for driving the bidirectional pump to work after receiving a signal. The oil inlet of the bidirectional pump is connected to the oil tank 4, and the oil outlet of the bidirectional pump is connected to the hydraulic control valve assembly 7. That is to say, after the bidirectional pump starts to rotate with the motor, it will pump hydraulic oil from the oil tank 4 and deliver it to the oil circuit.

[0046] In this embodiment, the hydraulic control valve assembly 7 includes: a valve block 7.1, and a plurality of threaded cartridge valves and two one-way throttle valves 7.2 inserted into the valve block 7.1, specifically as follows: Figure 4 , Figure 5 and Figure 6 As shown, Figure 4 Specifically, this is an isometric view of the hydraulic control valve assembly 7. Figure 5 Rear view of hydraulic control valve assembly 7. Figure 6 This is a schematic diagram of the hydraulic circuit in this embodiment; all cartridge valves are threaded cartridge valves and are all centrally mounted on the valve block 7.1. This allows for the integration of the hydraulic circuit, completely solving the oil leakage problem caused by the rotation of the device when using the O-ring axial sealing method in the stacked hydraulic valve; and by integrating the hydraulic control valve assembly 7, the number of parts is reduced, and the overall volume and weight of the blade adjustment device are reduced.

[0047] Two one-way throttle valves 7.2 are connected to the two working ports of cylinder 1 via hydraulic oil pipes. The one-way throttle valves 7.2 control the piston running speed by adjusting the size of the throttle port. In addition, the valve block 7.1 is also provided with a connector 7.3 for connecting to the oil outlet of the bidirectional pump. The connector 7.3 can be connected to the hydraulic oil pipe and then connected to the two oil outlets of the bidirectional pump.

[0048] Furthermore, the threaded cartridge valve includes two check valves 7.4, two relief valves 7.5, and two pilot-operated check valves 7.6, as detailed below. Figure 4 and Figure 5 As shown, the two check valves 7.4 maintain pressure in the entire hydraulic system, preventing pressure leakage on the load side of cylinder 1. Check valves 7.4 also protect the bidirectional pump from hydraulic shock, isolating it and preventing back pressure damage. The two relief valves 7.5 control the maximum pressure in the hydraulic circuit to protect its safety. Specifically, relief valves 7.5 can set the maximum system pressure; in case of overpressure, they release oil to protect the system, and the released hydraulic oil will flow back to the tank 4. The hydraulically controlled check valve 7.6 can switch the oil circuit under specific operating conditions, changing the direction of the blade angle adjustment.

[0049] In this embodiment, to reduce the weight of the entire device, the mounting plate 5 is made of aluminum alloy. The upper end of the mounting plate 5 is fitted with the oil tank 4, the DC motor bidirectional pump assembly 6, and the hydraulic control valve assembly 7, while the lower end is fitted with the oil cylinder 1. Both the oil cylinder 1 and the oil tank 4 are located in the middle of the mounting plate 5. The DC motor bidirectional pump assembly 6 and the hydraulic control valve assembly 7 are symmetrical about the oil tank 4. It should be noted that in this embodiment, the weights of the DC motor bidirectional pump assembly 6 and the hydraulic control valve assembly 7 are also controlled to be approximately equal, thereby ensuring that the center of gravity of the entire blade angle adjustment device is located on the main shaft axis. This arrangement makes the entire device simple in structure and reasonable in layout, with the center of gravity of the device coinciding with the main shaft axis of the turbine. In addition, the integrated hydraulic control valve assembly 7 used in this application can also easily ensure that the center of gravity of the entire device is located on the main shaft axis of the hydraulic machinery, avoiding eccentricity of the hydraulic machinery during high-speed rotation and thus preventing malfunctions of its components.

[0050] Specifically, such as Figure 7 and Figure 8 As shown, the oil tank 4 includes: a tank body 4.1, an oil tank cover 4.2, a sealing ring assembly, and several oil level observation windows 4.3. In this embodiment, the oil tank 4 is an open-type oil tank 4, that is, the upper end face of the tank body 4.1 is open. The tank body 4.1 is rigidly connected to the center of the mounting plate 5 by using bolts. A partition 4.11 is provided at the bottom inside the tank body 4.1 to divide the space inside the oil tank 4 into two parts: an oil suction area 4.12 and an oil return area 4.13. Moreover, the side wall of the oil tank 4 is also provided with an oil outlet 4.4 communicating with the oil suction area 4.12 and an oil return interface 4.5 communicating with the oil return area 4.13. 4.4 is connected to the inlet of the bidirectional pump, and 4.5 is connected to the return port of the valve block 7.1. The tank cover 4.2 is detachably installed on the top of the tank 4.1 to protect the hydraulic oil from contamination. In addition, to prevent hydraulic oil leakage, a sealing ring assembly is installed between the tank 4.1 and the tank cover 4.2. Furthermore, to facilitate the operator's observation of the remaining hydraulic oil in the tank 4, several oil level observation windows 4.3 are evenly spaced along the axial direction on the side wall of the tank 4.1. The oil level observation windows 4.3 can be transparent windows, and their number and material are not limited in this article.

[0051] Furthermore, in order to facilitate the addition of hydraulic oil to the oil tank 4, a through hole is provided in the middle of the oil tank cover 4.2. At the same time, a filling pipe 4.6 connected to the through hole is provided at the top of the oil tank cover 4.2. The filling pipe 4.6 is set vertically to the oil tank cover 4.2, and an air filter 4.7 is also installed inside the filling pipe 4.6. The air filter 4.7 can effectively prevent carbon brush powder and other impurities such as dust and moisture from entering the oil tank 4.

[0052] Furthermore, the fuel tank cap 4.2 engages with the fuel tank 4 via two mutually perpendicular mating surfaces, specifically as follows: Figure 8As shown, the contact surface between the edge of the oil tank cover 4.2 and the housing 4.1 is a stepped surface; correspondingly, the sealing ring assembly includes a first sealing ring 4.8 and a second sealing ring 4.9. The first sealing ring 4.8 and the second sealing ring 4.9 are respectively disposed on the two mating surfaces. That is to say, the oil tank cover 4.2 and the housing 4.1 adopt a combination of axial sealing and radial sealing to prevent internal hydraulic oil leakage.

[0053] In this embodiment, the hydraulic machinery blade angle adjustment device further includes: a carbon brush bracket 8, a carbon brush slip ring assembly 9, and a cable cover plate 10. It is understood that since the angle adjustment device rotates with the main shaft of the hydraulic machinery, it is inconvenient to connect the power via cables. Therefore, in this embodiment, a carbon brush bracket 8 is fixedly installed on the upper cover of the hydraulic machinery, meaning that the carbon brush bracket 8 is stationary relative to the ground. Simultaneously, both the carbon brush slip ring assembly 9 and the cable cover plate 10 are annular structures, and both are fitted around the outer periphery of the oil filling pipe 4.6. The top of the carbon brush bracket 8 is connected to the carbon brush slip ring assembly 9, which is connected to the motor via cables. The cable cover plate 10 is used to protect the cables. Furthermore, in this application, the carbon brush slip ring assembly 9 includes only two slip rings. In this way, power input can be achieved through the carbon brush bracket 8 in conjunction with the carbon brush slip ring assembly 9. It should be noted that this embodiment requires ensuring that the axis of the carbon brush slip ring assembly 9 is substantially coincident with the axis of the hydraulic machinery main shaft to reduce carbon brush wear, increase carbon brush lifespan, and reduce noise generated by friction between the carbon brush and the slip ring.

[0054] In this embodiment, a DC motor-bidirectional pump assembly 6, consisting of a DC motor and a bidirectional pump, is used, eliminating the need for an electromagnetic reversing valve. The DC motor and bidirectional pump can be directly mounted on the rotating body of the blade angle adjustment device. Compared to existing technologies that externalize the motor to reduce the number of slip rings, which adds many other components and makes assembly and disassembly inconvenient, this novel blade angle adjustment device uses a hydraulic principle that simplifies the overall structure, making installation and maintenance extremely convenient. More importantly, it reduces the number of slip rings; only two slip rings are needed to adjust the blade angle. Reducing the number of slip rings also reduces the overall height of the device, and ensuring the concentricity of the two slip rings during installation is easily achieved.

[0055] In addition, the hydraulic machinery blade angle adjustment device also includes a laser displacement sensor 11 and a feedback plate 12. The laser displacement sensor 11 is connected to the middle of the carbon brush bracket 8 through the laser displacement sensor mounting plate 13, while the feedback plate 12 is installed on the upper end face of the external thread flange 3, and the feedback plate 12 is perpendicular to the laser emitted by the laser sensor. In this way, the laser displacement sensor 11 can accurately detect the distance between itself and the feedback plate 12, and thus determine the extension or retraction length of the piston rod 1.1, thereby indirectly obtaining the rotation angle of the blade.

[0056] In other words, the laser displacement sensor 11 is located in the middle of the blade angle adjustment device, unlike in the prior art where it is placed at the top of the device. This simplifies the structure of the cylinder 1, eliminating the need for a double-rod hydraulic cylinder and reducing a potential oil leakage point. It also increases the usable space on the upper surface of the cylinder 1; for example, in this embodiment, the oil tank 4 can be placed at the center of the device. Furthermore, in this application, the laser displacement sensor is mounted on the carbon brush bracket 8 and is stationary relative to the ground (i.e., signal transmission does not require the carbon brush slip ring assembly 9). This contrasts with the prior art where the laser sensor 11 is placed on a support plate and rotates with the hydraulic machinery spindle, moving relative to the ground (requiring at least two carbon brush slip rings). In other words, the advantage of placing the laser displacement sensor 11 outside the blade angle adjustment device is that it can transmit blade angle change signals without the need for carbon brush slip rings. It should be noted that in this specification, relational terms such as "first" and "second" are used only to distinguish one entity from several other entities and do not necessarily require or imply any such actual relationship or order between these entities.

[0057] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0058] The embodiments provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A hydraulic machinery blade angle adjustment device, characterized in that, include: The hydraulic cylinder (1) is installed on the top of the main shaft of the hydraulic machinery via a connecting flange (2). The hydraulic cylinder (1) is equipped with a reciprocating piston rod (1.1). The piston rod (1.1) is used to connect to the blade adjusting rod of the hydraulic machinery via an external thread flange (3). The oil tank (4) is mounted on the top of the oil cylinder (1) via the mounting plate (5), and its interior is used to store hydraulic oil; A DC motor bidirectional pump assembly (6) is installed on the mounting plate (5). The DC motor bidirectional pump assembly (6) is electrically connected to the central control system of the hydraulic machinery. The DC motor bidirectional pump assembly (6) is connected to the oil tank (4). The hydraulic control valve assembly (7) is installed on the mounting plate (5) and together with the oil cylinder (1), the oil tank (4) and the DC motor bidirectional pump assembly (6) form an oil circuit.

2. The hydraulic machinery blade angle adjustment device according to claim 1, characterized in that, The DC motor bidirectional pump assembly (6) includes a motor and a bidirectional pump. The motor is used to drive the bidirectional pump to work, and the bidirectional pump is used to drive the hydraulic oil to circulate in the oil circuit. The oil inlet of the bidirectional pump is connected to the oil tank (4).

3. The hydraulic machinery blade angle adjustment device according to claim 2, characterized in that, The hydraulic control valve assembly (7) includes: a valve block (7.1), and a plurality of threaded cartridge valves and two one-way throttle valves (7.2) inserted into the valve block (7.1). The two one-way throttle valves (7.2) are respectively connected to the two working ports of the cylinder (1). The one-way throttle valves (7.2) are used to control the running speed of the piston rod (1.1). The valve block (7.1) is also provided with a connector (7.3) for connecting to the outlet of the bidirectional pump.

4. The hydraulic machinery blade angle adjustment device according to claim 3, characterized in that, The threaded cartridge valve includes two check valves (7.4), two relief valves (7.5), and two hydraulically controlled check valves (7.6). The two check valves (7.4) are used to maintain pressure and protect the bidirectional pump from hydraulic shock. The two relief valves (7.5) are used to control the maximum pressure in the oil circuit to protect the safety of the oil circuit.

5. The hydraulic machinery blade angle adjustment device according to claim 1, characterized in that, The cylinder (1) and the oil tank (4) are both located in the middle of the mounting plate (5). The DC motor bidirectional pump assembly (6) and the hydraulic control valve assembly (7) are located on the side of the mounting plate (5) where the oil tank (4) is mounted, and the DC motor bidirectional pump assembly (6) and the hydraulic control valve assembly (7) are symmetrical about the oil tank (4).

6. The hydraulic machinery blade angle adjustment device according to claim 3, characterized in that, The oil tank (4) includes: a tank body (4.1), an oil tank cover (4.2), a sealing ring assembly, and several oil level observation windows (4.3). The tank body (4.1) is rigidly connected to the center of the mounting plate (5) by a stop bolt. A partition (4.11) is provided at the bottom of the tank body (4.1) to divide the oil tank (4) into an oil suction area (4.12) and an oil return area (4.13). An oil outlet (4.4) communicating with the oil suction area (4.12) is provided on the side wall of the oil tank (4). The oil return port (4.5) is connected to the oil return zone (4.13), the oil outlet port (4.4) is connected to the oil inlet port, the oil return port (4.5) is connected to the oil return port of the valve block (7.1), the oil tank cover (4.2) is installed on the top of the tank body (4.1), the sealing ring assembly is installed between the tank body (4.1) and the oil tank cover (4.2), and a plurality of oil level observation windows (4.3) are spaced apart and evenly arranged along the axial direction of the tank body (4.1).

7. The hydraulic machinery blade angle adjustment device according to claim 6, characterized in that, The fuel tank cover (4.2) has a through hole in the middle, and the top of the fuel tank cover (4.2) is provided with a refueling pipe (4.6) connected to the through hole. An air filter (4.7) is installed in the refueling pipe (4.6) to prevent impurities from entering the fuel tank (4).

8. The hydraulic machinery blade angle adjustment device according to claim 7, characterized in that, The oil tank cap (4.2) engages with the oil tank (4) via two mutually perpendicular mating surfaces. The sealing ring assembly includes a first sealing ring (4.8) and a second sealing ring (4.9), with the first sealing ring (4.8) and the second sealing ring (4.9) respectively disposed on the two mating surfaces.

9. The hydraulic machinery blade angle adjustment device according to claim 7, characterized in that, Also includes: The carbon brush holder (8), carbon brush slip ring assembly (9), and wire cover plate (10) are fixedly installed on the upper end cover of the hydraulic machinery. The carbon brush slip ring assembly (9) and the wire cover plate (10) are both annular structures and are both sleeved on the outer periphery of the oil filling pipe (4.6). The top of the carbon brush holder (8) is connected to the carbon brush slip ring assembly (9). The carbon brush slip ring assembly (9) is connected to the motor through a cable. The wire cover plate (10) is used to protect the cable.

10. The hydraulic machinery blade angle adjustment device according to claim 9, characterized in that, It also includes a laser displacement sensor (11) and a feedback plate (12). The laser displacement sensor (11) is connected to the middle of the carbon brush bracket (8) through a laser displacement sensor mounting plate (13). The feedback plate (12) is installed on the external thread flange (3), and the laser displacement sensor (11) can detect the distance between itself and the feedback plate (12).

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