Coaxial vertically mounted electro-hydraulic cylinder

Abstract

The utility model relates to a coaxial line vertical electro-hydraulic cylinder and belongs to the technical field of electro-hydraulic cylinders. The utility model aims to install the motor and the hydraulic cylinder in the same axis and to coat the oil tank outside the hydraulic cylinder. The utility model comprises a motor, a hydraulic pump connected with the motor, a nozzle, a hydraulic cylinder, an oil tank coated outside the cylinder barrel of the hydraulic cylinder, the upper end of the oil tank being sealed by cooperating with the upper end sealing plug through the oil tank pressing cap, and the lower end of the oil tank being sealingly installed on the cylinder body base. A hydraulic cylinder descending pipe joint communicating with the upper cavity of the piston is installed on the upper end of the cylinder barrel of the hydraulic cylinder, the hydraulic cylinder descending pipe joint and the U-shaped clamp descending pipe joint are communicated through a pipeline, and the U-shaped clamp descending pipe joint is communicated with the U-shaped clamp inner descending oil path in the straight-through U-shaped clamp. The utility model is designed for the special application environment, and the motor and the hydraulic cylinder are in the same axis. At the same time, the utility model does not need a separate external oil tank, thereby saving a large amount of space for the installation of the whole equipment.

Description

Technical Field

[0001] This utility model belongs to the field of electro-hydraulic cylinder technology. Background Technology

[0002] Electro-hydraulic cylinders, short for electric hydraulic cylinders, are mechatronic products that integrate the advantages of electric servo drive and hydraulic actuation. They highly integrate components such as motors, hydraulic pumps, oil tanks, and hydraulic cylinders that are previously scattered in a hydraulic system, forming a modular, more intelligent, and easier-to-use execution unit. Existing electro-hydraulic cylinders typically have the motor, hydraulic cylinder, and oil tank arranged side-by-side on a hydraulic pump, and the hydraulic operation is completed through oil circuits within the pump. Summary of the Invention

[0003] The purpose of this invention is to create a vertically mounted electro-hydraulic cylinder with the motor and hydraulic cylinder installed coaxially and the oil tank fitted outside the hydraulic cylinder.

[0004] This utility model includes a motor, a hydraulic pump connected to the motor, a nozzle, and a hydraulic cylinder. An oil tank is fitted outside the cylinder barrel of the hydraulic cylinder. The upper end of the oil tank is sealed by an oil tank cap and an upper sealing plug. The lower end of the oil tank is sealed and installed on the cylinder base.

[0005] A hydraulic cylinder descending pipe joint is installed at the upper end of the hydraulic cylinder barrel, which communicates with the upper chamber of the piston. The hydraulic cylinder descending pipe joint is connected to the U-clamp descending pipe joint through a pipeline. The U-clamp descending pipe joint is connected to the descending oil circuit inside the U-clamp that is connected to the straight U-clamp.

[0006] An oil supply port that communicates with the inside of the oil tank is installed on the oil tank. The oil supply port is connected to the oil supply port of the hydraulic pump through a pipeline. The oil supply port of the hydraulic pump is connected to the oil circuit inside the hydraulic pump.

[0007] The hydraulic pump is connected to the bottom of the straight U-shaped clamp, the top of the straight U-shaped clamp is the cylinder base, the hydraulic cylinder with oil tank is installed on the cylinder base, and the straight U-shaped clamp has a lower end mounting hole in the middle.

[0008] The hydraulic pump is connected to the U-shaped clamp through the U-clamp's downward oil passage and upward oil passage, and then to the hydraulic cylinder through the upward and downward oil passages.

[0009] The rising oil circuit of the hydraulic pump is connected to the rising oil circuit inside the U-clamp through the rising nozzle sub-assembly. The rising oil circuit inside the U-clamp is connected to the intermediate oil chamber through oil circuit No. 1 and oil circuit No. 2 in sequence. The two ends of the intermediate oil chamber are connected to the front chamber of the guide piston and the ball valve oil chamber respectively. The inner diameter of the intermediate oil chamber is smaller than the inner diameter of the front chamber of the guide piston and the ball valve oil chamber. There is a ball valve with a ball diameter larger than the inner diameter of the intermediate oil chamber in the ball valve oil chamber. There is a ball valve return spring between the rear side of the ball valve and the ball valve oil chamber seal.

[0010] The descent oil circuit of the hydraulic pump is connected to the descent oil circuit inside the U-clamp through the descent nozzle sub-assembly. The descent oil circuit inside the U-clamp is connected to the rear chamber of the guide piston through the No. 3 oil circuit.

[0011] Inside the piston chamber is a guide piston, which divides the piston chamber into a guide piston front chamber and a guide piston rear chamber; the ball valve oil chamber is connected to the lower chamber of the hydraulic cylinder through oil circuit number four.

[0012] This utility model has a safety valve sub-assembly installed on the fuel tank.

[0013] This utility model is a structure designed for special application environments, in which the motor and hydraulic cylinder are on the same axis. At the same time, it eliminates the need for a separate external oil tank, saving a lot of space for the installation of the entire device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of this utility model after the fuel tank has been removed;

[0016] Figure 3 This is an axial sectional view of the present invention;

[0017] Figure 4 This is a utility model Figure 3 Enlarged schematic diagram of part A;

[0018] Figure 5 This is a utility model Figure 3 Enlarged diagram of part B;

[0019] Figure 6 This is a schematic diagram of the oil circuit between the straight-through U-shaped clamp and the hydraulic cylinder of this utility model;

[0020] Figure 7 This is an overall side view of the present invention. Detailed Implementation

[0021] This utility model includes a motor 12, a hydraulic pump 11 connected to the motor 12, a nozzle, and a hydraulic cylinder. The connection method between the motor 12 and the hydraulic pump 11 is a relatively mature technology, and its internal oil circuit is also widely used; therefore, this utility model does not describe it incorrectly. The nozzle is also a commonly used component, and in this utility model, it is used to connect the hydraulic pump 11 with the internal oil circuit of the straight-through U-shaped clamp 9. See [link to relevant documentation]. Figure 1 The hydraulic cylinder includes an upper connecting U-shaped clamp 1, a piston rod 2, and a cylinder body 3.

[0022] An oil tank 6 is fitted outside the cylinder barrel 3 of the hydraulic cylinder. This forms a cavity between the outer shell of the oil tank 6 and the outer wall of the cylinder barrel 3, where hydraulic oil is stored. The upper end of the oil tank 6 is sealed by an oil tank cap 14 and an upper sealing plug 15. The lower end of the oil tank 6 is sealed and mounted on the cylinder base 20. (See...) Figure 4 The oil tank cap 14 is installed on the top of the outer shell of the oil tank 6, and the upper sealing plug 15 is installed on the outer wall of the cylinder barrel 3. Then, the oil tank cap 14 and the upper sealing plug 15 cooperate to install the upper end of the oil tank 6 shell onto the hydraulic cylinder barrel 3, and seal the oil tank 6 shell and the hydraulic cylinder barrel 3 at the upper end. See Figure 5 The lower end of the oil tank 6 is sealed and mounted on the cylinder base 20. Through this structure, the oil tank 6 is sealed and fitted outside the hydraulic cylinder barrel 3.

[0023] A hydraulic cylinder downcomer 4, communicating with the upper cavity of piston 19, is installed at the upper end of the hydraulic cylinder barrel 3. The hydraulic cylinder downcomer 4 is connected to the U-clamp downcomer 8 via a pipeline. The U-clamp downcomer 8 is connected to the U-clamp internal downcomer oil passage 16 within the straight-through U-clamp 9. The piston 19 of the hydraulic cylinder is installed at the bottom of the piston rod 2, which divides the interior of the hydraulic cylinder barrel 3 into upper and lower cavities. By injecting hydraulic oil into different cavities, the piston rod 2 is lifted or lowered. Thus, both cavities need to be filled or drained with oil. Therefore, a hydraulic cylinder downcomer 4 is installed at the upper end of the hydraulic cylinder barrel 3 to allow oil to enter and exit the upper cavity. During lifting, oil exits from this port, and during lowering, oil enters from this port. The hydraulic cylinder downcomer 4 is connected to the U-clamp downcomer 8, mainly for supplying or discharging oil. The oil outlet or return of the U-clamp downcomer 8 originates from the U-clamp internal downcomer oil passage 16 within the straight-through U-clamp 9.

[0024] An oil supply port 7, which communicates with the interior of the oil tank 6, is installed on the oil tank 6. The oil supply port 7 is connected to the hydraulic pump oil supply port 10 via a pipeline. The hydraulic pump oil supply port 10 is connected to the oil circuit inside the hydraulic pump 11. This part is the connecting route for supplying oil from the inside of the oil tank 6 to the hydraulic pump 11, and it is also the passage for supplying or discharging oil to the lower chamber of the hydraulic cylinder.

[0025] The hydraulic pump 11 is connected to the bottom of the straight-through U-shaped clamp 9. The top of the straight-through U-shaped clamp 9 is a cylinder base 20. The hydraulic cylinder with an oil tank is mounted on the cylinder base 20. The straight-through U-shaped clamp 9 has a lower end mounting hole 13 in the middle. See Figure 1 and Figure 2 As can be seen from the outside of the figure, the bottom of the hydraulic cylinder with oil tank is sequentially equipped with a straight U-shaped clamp 9, a hydraulic pump 11 and a motor 12, forming a mechanical connection on the same axis.

[0026] The hydraulic pump 11 is connected to the rising and falling oil passages via the U-shaped clamp 9's internal descending oil passage 16 and rising oil passage 21, respectively, and then to the hydraulic cylinder via the rising and falling oil passages. To facilitate the delivery of oil from the hydraulic pump 11 to the lower chamber of the hydraulic cylinder, two passages (the U-shaped clamp descending oil passage 16 and the U-shaped clamp rising oil passage 21) are provided: one to facilitate the discharge of oil from the lower chamber, and the other to facilitate the delivery of oil into the lower chamber. Therefore, they are respectively connected to the rising and falling oil passages supplying oil to the lower chamber. (See section [link to relevant documentation]). Figure 5 .

[0027] See Figure 4 and Figure 5 Since the injection or discharge of oil into the lower chamber of the hydraulic cylinder is accomplished through a single oil circuit (oil circuit 4, 23), an oil circuit sub-pump structure is set up, namely, the rising oil circuit and the falling oil circuit constitute the oil circuit structure.

[0028] The lifting oil circuit of the hydraulic pump 11 is connected to the lifting oil circuit 21 inside the U-clamp via the lifting nozzle sub-assembly 18. The lifting oil circuit 21 inside the U-clamp is connected to the intermediate oil chamber 30 via oil circuit 31 and oil circuit 24. The two ends of the intermediate oil chamber 30 are connected to the front chamber of the guide piston 25 and the ball valve oil chamber 32, respectively. The inner diameter of the intermediate oil chamber 30 is smaller than the inner diameter of the front chamber of the guide piston 25 and the ball valve oil chamber 32. Inside the ball valve oil chamber 32, there is a ball valve 22 with a ball diameter larger than the inner diameter of the intermediate oil chamber 30. There is a ball valve return spring 33 between the rear side of the ball valve 22 and the ball valve oil chamber seal. The so-called lifting oil circuit is the oil supply circuit that injects oil into the lower chamber of the hydraulic cylinder to lift the piston rod. At this time, the oil from the hydraulic pump 11 is sequentially sent through the rising nozzle sub-assembly 18 into the rising oil passage 21, oil passage 31, oil passage 24, and intermediate oil chamber 30 within the U-clamp. The oil pressure opens the ball valve 22, allowing the oil to enter the ball valve chamber 32. Finally, it is sent through the fourth oil passage 23 into the lower chamber of the hydraulic cylinder, thereby lifting the piston and piston rod. During the lifting process, the oil in the upper chamber of the hydraulic cylinder is sent through the hydraulic cylinder descending pipe joint 4 and the U-clamp descending pipe joint 8 into the descending oil passage 16 within the U-clamp, and finally into the hydraulic pump 11 for circulation. During this process, after entering the intermediate oil chamber 30, the oil is simultaneously divided into two paths: one supplying oil to the lower chamber of the hydraulic cylinder, and the other entering the front chamber 25 of the guide piston. Meanwhile, the return oil from the upper chamber of the hydraulic cylinder enters the descending oil passage 16 within the U-clamp, one path into the hydraulic pump 11, and the other into the rear chamber 26 of the guide piston. At this point, the two ends of the guide piston 27 are roughly balanced, and excessive oil pressure at either end does not affect the supply of oil to the lower chamber of the hydraulic cylinder.

[0029] The descent oil circuit of hydraulic pump 11 is connected to the descent oil circuit 16 inside the U-clamp via the descent nozzle sub-assembly 17. The descent oil circuit 16 inside the U-clamp is connected to the guide piston rear chamber 26 via oil circuit 3 29. The so-called descent oil circuit is the oil supply circuit for injecting oil into the upper chamber of the hydraulic cylinder and for lowering the piston rod. At this time, hydraulic pump 11 supplies oil to the descent oil circuit 16 inside the U-clamp through the descent nozzle sub-assembly 17. When the oil moves forward, it is divided into two paths. The first path supplies oil to the upper chamber of the hydraulic cylinder through the U-clamp descent pipe joint 8 and the hydraulic cylinder descent pipe joint 4. The second path supplies oil through oil circuit 3 29 and the guide piston rear chamber 26 to squeeze the guide piston 27. When a certain pressure is reached, it will push the guide piston 27 forward until the push rod at its front end opens the ball valve 22. At this time, the ball valve oil chamber 32 is connected to the intermediate oil chamber 30.

[0030] Regarding the pressure formation process of the guide piston 27 advancing in the descent oil circuit: the oil from the hydraulic pump 11 is injected into the upper chamber through the descent nozzle sub-assembly 17, the descent oil circuit 16 inside the U-clamp, the descent pipe joint 8 inside the U-clamp, and the descent pipe joint 4 of the hydraulic cylinder. At this time, because the ball valve 22 is blocked, the oil in the lower chamber cannot be output. Therefore, the oil injection into the upper chamber stops. The oil from the hydraulic pump 11 enters the rear chamber 26 of the guide piston through the descent nozzle sub-assembly 17, the descent oil circuit 16 inside the U-clamp, and the No. 3 oil circuit 29, pushing the guide piston 27 forward until the ball valve 22 is opened. At this time, the ball valve oil chamber 32 is connected to the intermediate oil chamber 30. After the connection, the oil in the lower chamber will pass through the No. 4 oil circuit 23, the ball valve oil chamber 32, the intermediate oil chamber 30, the No. 2 oil circuit 24, the No. 1 oil circuit 31, and the rising oil circuit 21 inside the U-clamp, and finally enter the hydraulic pump 11 through the rising nozzle sub-assembly 18. The two ends of the guide piston 27 remain in a balanced state until the descent is completed.

[0031] Inside the piston chamber is a guide piston 27, which divides the piston chamber into a front guide piston chamber 25 and a rear guide piston chamber 26. The ball valve oil chamber 32 is connected to the lower chamber of the hydraulic cylinder via oil passage 23. The guide piston 27 is a small, movable piston with a sealing ring installed in its center, thus dividing the piston chamber into a front chamber and a rear chamber (the front guide piston chamber 25 and the rear guide piston chamber 26). The ball valve oil chamber 32 and oil passage 23 are channels for supplying or discharging oil to the lower chamber of the hydraulic cylinder.

[0032] Through the design of the guide piston 27 and its related oil circuit. Figure 6 It can buffer and protect the hydraulic cylinder, solving the problem of slippage.

[0033] A safety valve sub-assembly 5 is installed on the oil tank 6. The safety valve sub-assembly 5 facilitates the replenishment of hydraulic oil into the oil tank 6 and the release of pressure.

Claims

1. A coaxial vertical electro-hydraulic cylinder, comprising a motor (12), a hydraulic pump (11) connected to the motor (12), a nozzle, and a hydraulic cylinder, characterized in that: An oil tank (6) is fitted outside the cylinder barrel (3) of the hydraulic cylinder. The upper end of the oil tank (6) is sealed by the oil tank cap (14) and the upper end sealing plug (15). The lower end of the oil tank (6) is sealed and installed on the cylinder base (20). A hydraulic cylinder descending pipe joint (4) is installed at the upper end of the cylinder barrel (3) and communicates with the upper cavity of the piston (19). The hydraulic cylinder descending pipe joint (4) and the U-clamp descending pipe joint (8) are connected through a pipeline. The U-clamp descending pipe joint (8) is connected to the U-clamp descending oil passage (16) inside the straight U-clamp (9). An oil supply port (7) connected to the inside of the oil tank (6) is installed on the oil tank (6). The oil supply port (7) is connected to the oil supply port (10) of the hydraulic pump through a pipeline. The oil supply port (10) of the hydraulic pump is connected to the oil circuit inside the hydraulic pump (11). The hydraulic pump (11) is connected to the bottom of the straight U-shaped clamp (9). The top of the straight U-shaped clamp (9) is the cylinder base (20). The hydraulic cylinder with oil tank is installed on the cylinder base (20). The straight U-shaped clamp (9) has a lower end mounting hole (13) in the middle. The hydraulic pump (11) is connected to the rising oil circuit and the falling oil circuit through the U-shaped clamp (9) and the rising oil circuit (21) inside the U-shaped clamp (9), and is then connected to the hydraulic cylinder through the rising oil circuit and the falling oil circuit. The rising oil circuit of the hydraulic pump (11) is connected to the rising oil circuit (21) inside the U-clamp through the rising nozzle sub-assembly (18). The rising oil circuit (21) inside the U-clamp is connected to the intermediate oil chamber (30) through the first oil circuit (31) and the second oil circuit (24) in sequence. The two ends of the intermediate oil chamber (30) are connected to the front chamber of the guide piston (25) and the ball valve oil chamber (32) respectively. The inner diameter of the intermediate oil chamber (30) is smaller than the inner diameter of the front chamber of the guide piston (25) and the ball valve oil chamber (32). There is a ball valve (22) in the ball valve oil chamber (32) with a ball diameter larger than the inner diameter of the intermediate oil chamber (30). There is a ball valve return spring (33) between the rear side of the ball valve (22) and the ball valve oil chamber block. The descent oil circuit of the hydraulic pump (11) is connected to the descent oil circuit (16) inside the U-clamp through the descent nozzle sub-assembly (17). The descent oil circuit (16) inside the U-clamp is connected to the rear chamber (26) of the guide piston through the No. 3 oil circuit (29). Inside the piston chamber is a guide piston (27), which divides the piston chamber into a guide piston front chamber (25) and a guide piston rear chamber (26); the ball valve oil chamber (32) is connected to the lower chamber of the hydraulic cylinder through the fourth oil circuit (23).

2. The coaxial vertical electro-hydraulic cylinder according to claim 1, characterized in that: A safety valve sub-assembly (5) is installed on the fuel tank (6).

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