Hydraulic cylinder with energy storage device

Abstract

The utility model discloses a hydraulic cylinder with an energy storage device, and mainly relates to the technical field of hydraulic cylinders. Comprising a cylinder barrel, a piston rod arranged in the cylinder barrel and a guide sleeve arranged at the rear end of the cylinder barrel, a nitrogen cavity is formed in the front end in the cylinder barrel, a nitrogen inflation hole communicated with the nitrogen cavity is formed in the cylinder barrel, and a one-way valve is arranged in the nitrogen inflation hole; a first piston is arranged at the front end of the piston rod, a second piston is arranged on the piston rod, a cavity extending oil port and a cavity returning oil port are formed in the outer wall of the cylinder barrel, the cavity extending oil port is located between the first piston and the second piston, and the cavity returning oil port is located between the second piston and the guide sleeve. An oil channel for cooling is arranged on the outer side of the nitrogen cavity; the hydraulic cylinder has the advantages of being energy-saving, low in starting pressure, low in energy consumption and the like, and can solve the problems that a traditional hydraulic cylinder is high in starting pressure, slow in response in the starting stage and high in energy consumption under the load working condition during actual work.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, and specifically relates to a hydraulic cylinder with an energy storage device. Background Art

[0002] In the actual application field of hydraulic cylinders, affected by factors such as hydraulic transmission efficiency, heat generation, and the load conditions of hydraulic cylinders, there are problems such as high starting pressure and slow response in the starting stage of hydraulic cylinders under load conditions. The conventional solutions are to increase the motor power of the hydraulic system, increase the flow rate of the hydraulic pump, etc. to improve the response speed. However, with the increase of the motor power and the displacement of the hydraulic pump, the increase in energy consumption follows, and problems such as heat generation in the hydraulic system also follow, which has great limitations. Especially when the hydraulic cylinder is under load conditions, a large throttle is required to start the hydraulic cylinder in the starting stage, resulting in great energy waste. Content of the Utility Model

[0003] The purpose of the utility model is to solve the problems existing in the prior art, and provide a hydraulic cylinder with an energy storage device, which has the characteristics of energy saving, low starting pressure, and low energy consumption, and can solve the problems of high starting pressure, slow response in the starting stage, and high energy consumption of traditional hydraulic cylinders in actual work.

[0004] In order to achieve the above purpose, the utility model is realized through the following technical solutions:

[0005] A hydraulic cylinder with an energy storage device includes a cylinder barrel, a piston rod arranged in the cylinder barrel, and a guide sleeve arranged at the rear end of the cylinder barrel. A nitrogen cavity is arranged at the front end in the cylinder barrel. A nitrogen charging hole communicated with the nitrogen cavity is arranged on the cylinder barrel, and a one-way valve is arranged in the nitrogen charging hole. A first piston is arranged at the front end of the piston rod, a second piston is arranged on the piston rod, and an extension cavity oil port and a return cavity oil port are arranged on the outer wall of the cylinder barrel. Among them, the extension cavity oil port is located between the first piston and the second piston, and the return cavity oil port is located between the second piston and the guide sleeve.

[0006] Preferably, a spacer sleeve is arranged at the front end in the cylinder barrel. The inner diameter of the spacer sleeve is smaller than the outer diameter of the first piston, and the inner space of the spacer sleeve is the nitrogen cavity.

[0007] Preferably, the outer diameter of the spacer sleeve is smaller than the inner diameter of the cylinder barrel, and several spacer sleeve support rings are arranged on the outer wall of the spacer sleeve in sequence from front to back.

[0008] Preferably, the nitrogen charging hole is an L-shaped hole. The one-way valve is located in the vertical part of the L-shaped hole, and a sealing plug is arranged at the outer end of the L-shaped hole.

[0009] Preferably, a ring-shaped oil cooling cavity is arranged at the front end of the outer wall of the cylinder barrel, and a cooling oil inlet and a cooling oil outlet are arranged on the outer wall of the ring-shaped oil cooling cavity.

[0010] Preferably, sealing structures are provided on the guide sleeve, the first piston, and the second piston.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The present utility model reintroduces nitrogen into the nitrogen chamber through the nitrogen inflation hole, causing the air pressure in the nitrogen chamber to rise. When the hydraulic cylinder is about to start, the pressure in the nitrogen chamber pushes the first piston to move, and the first piston simultaneously pushes the piston rod to extend outwards, thereby reducing the starting pressure of the hydraulic system and the hydraulic cylinder. Due to the existence of the pressure in the nitrogen chamber, the piston rod can be extended with lower energy consumption, featuring energy conservation, low starting pressure, and low energy consumption, and capable of solving the problems of high starting pressure, slow response in the starting stage, and high energy consumption existing in traditional hydraulic cylinders under load conditions during actual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present utility model;

[0014] Figure 2 is Figure 1 an enlarged view of part A of

[0015] Reference numerals shown in the drawings: 1, cylinder barrel; 2, piston rod; 3, guide sleeve; 4, nitrogen chamber; 5, nitrogen inflation hole; 6, check valve; 7, first piston; 8, second piston; 9, oil port for extending cavity; 10, oil port for return cavity; 11, spacer sleeve; 12, spacer sleeve support ring; 13, sealing plug; 14, annular oil cooling cavity; 15, cooling oil inlet; 16, cooling oil outlet; 17, extending cavity; 18, return cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present utility model will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the present utility model, those skilled in the art can make various modifications or alterations to the present utility model, and these equivalent forms also fall within the scope defined by this application.

[0017] Embodiment: As shown in the attached Figure 1-2 figures, the present utility model relates to a hydraulic cylinder with an energy storage device, including a cylinder barrel 1, a piston rod 2 disposed within the cylinder barrel 1, and a guide sleeve 3 disposed at the rear end of the cylinder barrel 1. The rear end of the piston rod 2 extends out of the cylinder barrel 1 through the guide sleeve 3.

[0018] A nitrogen cavity 4 is provided at the front end inside the cylinder barrel 1. A nitrogen gas charging hole 5 communicating with the nitrogen cavity 4 is provided on the cylinder barrel 1. A one-way valve 6 is provided in the nitrogen gas charging hole 5. Nitrogen gas is filled into the nitrogen cavity 4 through the nitrogen gas charging hole 5 for use. The one-way valve 6 is used to prevent the nitrogen gas in the nitrogen cavity 4 from leaking out through the nitrogen gas charging hole 5.

[0019] Preferably, the nitrogen gas charging hole 5 is an L-shaped hole. The one-way valve 6 is located in the vertical part of the L-shaped hole. The axis line of the horizontal part of the L-shaped hole can be parallel to or coincide with the axis line of the cylinder barrel 1. A sealing plug 13 is provided at the outer end of the L-shaped hole. The sealing plug 13 and the L-shaped hole can be connected by threads. Internal threads are provided on the inner wall of the outer end of the L-shaped hole, and corresponding external threads are provided on the sealing plug 13. The sealing plug 13 is used for the sealing and protection of the nitrogen gas charging hole 5.

[0020] A first piston 7 is installed at the front end of the piston rod 2. A second piston 8 is provided in the middle or front or rear part of the piston rod 2. The second piston 8 and the piston rod 2 can adopt an integral structure. The second piston 8 is located at the rear side of the first piston 7.

[0021] Inside the steel cylinder 1, the space between the first piston 7 and the second piston 8 is the extension cavity 17, and the space between the second piston 8 and the guide sleeve 3 is the return cavity 18. An extension cavity oil port 9 communicating with the extension cavity 17 and a return cavity oil port 10 communicating with the return cavity 18 are provided on the outer wall of the cylinder barrel 1.

[0022] Since a nitrogen cavity 4 is provided at the front end inside the cylinder barrel 1, it is required that there is a certain space reserved between the extreme forward movement position of the first piston 7 and the front end inside the cylinder barrel 1. One solution is to provide a stepped hole inside the cylinder barrel 1. The inner diameter of the front part inside the cylinder barrel 1 is smaller than the inner diameter of the piston moving area, but its processing cost is relatively high. Preferably, a spacer sleeve 11 is provided at the front end inside the cylinder barrel 1. The inner diameter of the spacer sleeve 11 is smaller than the outer diameter of the first piston 7. The internal space of the spacer sleeve 11 is the nitrogen cavity 4. The spacer sleeve 11 is used to limit the first piston 7. The position where the first piston 7 abuts against the rear end of the spacer sleeve 11 is the extreme forward movement position of the first piston 7.

[0023] Furthermore, in order to reduce the processing cost of the spacer sleeve, the outer diameter of the spacer sleeve 11 is smaller than the inner diameter of the cylinder barrel 1. A plurality of spacer sleeve support rings 12 are successively provided on the outer wall of the spacer sleeve 11 from front to back. The spacer sleeve support rings 12 cooperate with the cylinder barrel 1, which can reduce the processing surface and lower the processing cost.

[0024] During frequent operation, the nitrogen chamber 4 will generate a certain amount of heat. To solve this problem, an oil cooling chamber is added in this area, and the normal return oil flow can be used to achieve normal temperature control in this area without additional devices. Specifically, an annular oil cooling chamber 14 is provided at the front end of the outer wall of the cylinder barrel 1, and a cooling oil inlet 15 and a cooling oil outlet 16 are provided on the outer wall of the annular oil cooling chamber 14.

[0025] Preferably, sealing structures are provided on the outer walls of the guide sleeve 3, the first piston 7, and the second piston 8, as well as on the inner wall of the guide sleeve 3.

[0026] The working principle of the present invention is as follows: Before use, nitrogen gas at a specified pressure is first filled into the nitrogen chamber 4 through the nitrogen gas filling hole 5. In the working state, when the oil cylinder operates normally, it realizes the action by injecting hydraulic oil into the extending chamber 17 and the returning chamber 18. When the right end of the hydraulic cylinder bears a load, the piston rod 2 is in a fully retracted state under the influence of the load and gravity. When the hydraulic cylinder is ready to start, the hydraulic oil enters the extending chamber through the extending chamber oil port 9, pushing the piston rod 2 to extend. At the same time, the pressure in the nitrogen chamber 4 pushes the first piston 7 to move, and the first piston 7 also pushes the piston rod 2 to extend, thereby reducing the starting pressure of the hydraulic system and the hydraulic cylinder. Due to the existence of the nitrogen chamber pressure, the piston rod can be extended with lower energy consumption. When the piston rod 2 needs to be retracted under load, the hydraulic oil enters the returning chamber 18 from the returning chamber oil port 10, and the piston rod 2 makes a retracting action. At this time, due to the existence of the nitrogen chamber 4, the hydraulic shock during commutation is avoided, and it can retract smoothly under load.

Claims

1. A hydraulic cylinder with an energy storage device, comprising a cylinder barrel (1), a piston rod (2) arranged in the cylinder barrel (1), and a guide sleeve (3) arranged at the rear end of the cylinder barrel (1), characterized in that: A nitrogen chamber (4) is provided at the front end of the cylinder barrel (1), a nitrogen charging hole (5) communicating with the nitrogen chamber (4) is provided on the cylinder barrel (1), and a one-way valve (6) is provided in the nitrogen charging hole (5); a first piston (7) is provided at the front end of the piston rod (2), a second piston (8) is provided on the piston rod (2), and an extension chamber oil port (9) and a return chamber oil port (10) are provided on the outer wall of the cylinder barrel (1), wherein the extension chamber oil port (9) is located between the first piston (7) and the second piston (8), and the return chamber oil port (10) is located between the second piston (8) and the guide sleeve (3).

2. A hydraulic cylinder with an energy storage device according to claim 1, characterized in that: A spacer sleeve (11) is provided at the front end of the cylinder (1), the inner diameter of the spacer sleeve (11) is smaller than the outer diameter of the first piston (7), and the internal space of the spacer sleeve (11) is a nitrogen chamber (4).

3. A hydraulic cylinder with an energy storage device according to claim 2, characterized in that: The outer diameter of the spacer (11) is smaller than the inner diameter of the cylinder (1), and a plurality of spacer support rings (12) are sequentially arranged on the outer wall of the spacer (11) from front to back.

4. A hydraulic cylinder with an energy storage device according to claim 1, characterized in that: The nitrogen filling hole (5) is an L-shaped hole, the one-way valve (6) is located in the vertical portion of the L-shaped hole, and a sealing plug (13) is provided at the outer end of the L-shaped hole.

5. The hydraulic cylinder with energy storage device according to claim 1, characterized in that: An annular oil cooling cavity (14) is provided at the front end of the outer wall of the cylinder barrel (1), and a cooling oil inlet (15) and a cooling oil outlet (16) are provided on the outer wall of the annular oil cooling cavity (14).

6. The hydraulic cylinder with an energy storage device according to claim 1, characterized in that: The guide sleeve (3), the first piston (7) and the second piston (8) are all provided with sealing structures.

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