Nitrogen energy storage hydraulic tension spring

Abstract

The utility model discloses a nitrogen energy storage hydraulic tension spring which comprises a cylinder body. A piston rod; the connecting piece is integrally formed, the connecting piece is connected to the periphery of the end of the cylinder body in a sleeving mode, and the piston rod is coaxially connected with the cylinder body through the connecting piece; the energy accumulator is filled with nitrogen; a connecting through hole capable of being matched with the cylinder body and the piston rod is formed in the middle of the connecting piece, and the two sides of the connecting through hole are communicated with a first channel and a second channel capable of being communicated with the energy accumulator respectively. Due to the fact that the connector is an integrated alloy connector and an internal flow channel is designed, a larger flow channel can be provided, the length of an oil way is shortened, the response speed is increased, and meanwhile pressure loss is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of tension cylinders, specifically relating to a nitrogen-storage hydraulic tension spring. Background Technology

[0002] Nitrogen-accumulated hydraulic tension springs are composite devices combining gas energy storage, hydraulic transmission, and spring characteristics. They are filled with high-pressure nitrogen gas, which stores elastic potential energy through gas compression, providing a stable pressure source. The nitrogen-accumulated hydraulic tension spring provides tension force. The hydraulic cylinder, piston rod, and oil circuit convert gas pressure into hydraulic energy, outputting linear tension force through piston rod movement. It features high tension force, stability, reliability, and long stroke. It is widely used in machine tool spindles, robot arms, and other automated equipment to provide tension, balance equipment load, reduce motor workload, and improve equipment response speed and application efficiency.

[0003] Chinese patent document with application number CN201921667175.2 discloses a hydraulic tension pneumatic spring cylinder, including an inner cylinder assembly and an outer cylinder assembly; the inner cylinder assembly includes an inner cylinder barrel, a front pull block, an inner piston, and a cylinder bottom block, with an air chamber formed between the inner piston and the front pull block, and a first oil chamber formed between the inner piston and the cylinder bottom block; the outer cylinder assembly includes an outer cylinder barrel, an outer piston, a front guide block, and a rear pull block, with a second oil chamber formed between the outer piston and the front guide block, and a third oil chamber formed between the outer piston and the rear pull block.

[0004] Further research by the applicant revealed that existing technical solutions connect the cylinder body and piston rod via a connector and connect the nitrogen accumulator to the cylinder body via additional piping. Because this connector is composed of multiple parts, flanges, seals, and additional piping are required at each connection point to connect to the accumulator, significantly increasing the probability of oil or gas leakage and reducing the system's pressure stability. Simultaneously, the external piping lengthens the hydraulic oil flow path, increasing flow resistance and inertia, leading to prolonged system response time and affecting accuracy in high-dynamic scenarios (such as high-speed robotic grasping). Split-type connections may introduce cavitation or pressure fluctuations, reducing energy transfer efficiency, especially during high-speed motion, where hydraulic shocks exacerbate pipeline vibration and energy loss. Utility Model Content

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A nitrogen-storage hydraulic tension spring, comprising:

[0007] Cylinder block;

[0008] Piston rod;

[0009] The connector is integrally formed and is sleeved on the outer periphery of the cylinder end. The piston rod is coaxially connected to the cylinder through the connector.

[0010] An accumulator filled with nitrogen gas;

[0011] The connector has a connecting through hole in the middle that can cooperate with the cylinder and piston rod. The two sides of the connecting through hole are respectively connected to a first channel and a second channel that can be connected to the accumulator.

[0012] Furthermore, the connector has a guide protrusion extending toward one side of the piston rod in the middle.

[0013] Furthermore, at least one set of sealing grooves is provided on the circumferential direction of the inner wall of the guide sleeve.

[0014] Furthermore, the bottom of the connector is provided with a positioning structure that cooperates with the cylinder body. The positioning structure includes a positioning piece and a positioning groove formed on the peripheral wall of the cylinder body. The edge of the positioning piece is provided with a positioning protrusion that can extend into the positioning groove.

[0015] Furthermore, the positioning piece has at least two fastening through holes.

[0016] Furthermore, a pressure gauge communicating with the second channel is connected to the connector.

[0017] Furthermore, the connector is provided with a valve connection port and an oil filling hole that communicates with the first channel.

[0018] Furthermore, the accumulator has an air filling hole at its bottom.

[0019] Furthermore, the cylinder body and piston rod are provided with lugs at their ends, and self-aligning bearings are mounted on the lugs.

[0020] Compared with the prior art, this utility model has the following advantages:

[0021] The connector is designed as a single unit, connecting the accumulator and containing an internal channel that links the accumulator to the cylinder. As a one-piece alloy connector with an internal flow channel, it provides a larger flow path, shortens the oil circuit length, improves response speed, and reduces pressure loss. Furthermore, it eliminates the need for external piping, reducing space requirements, resulting in a more compact structure and enhanced reliability. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram illustrating a specific embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram illustrating the main structural structure of a specific embodiment of the present utility model;

[0024] Figure 3 This is a cross-sectional structural diagram illustrating a specific embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram illustrating the internal structure of the connector in a specific embodiment of this utility model;

[0026] Figure 5 This is an exploded structural diagram of the connector, positioning structure, and cylinder body in an embodiment of this utility model;

[0027] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0028] The reference numerals in the accompanying drawings include:

[0029] Cylinder 1, positioning groove 10, piston rod 2, lug 20, self-aligning bearing 200, accumulator 3, air filling hole 30, connector 4, connecting through hole 40, first channel 41, second channel 42, guide sleeve 43, sealing groove 430, valve connection port 44, oil filling hole 45, positioning structure 6, positioning plate 60, fastening through hole 61, fastener 610, positioning protrusion 62, pressure gauge 7. Detailed Implementation

[0030] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] The accompanying drawings are for illustrative purposes only and represent schematic diagrams, not actual physical objects. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The same or similar reference numerals in the drawings of the embodiments of this utility model correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" appear, indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0032] like Figure 1 - Figure 6As shown, the present invention provides a nitrogen-storage hydraulic tension spring, comprising a cylinder body 1, a piston rod 2, an accumulator 3, and a connecting member 4.

[0033] The cylinder 1 and piston rod 2 are each provided with an ear ring 20, and a self-aligning bearing 200 is installed on the ear ring 20. The design of double ear rings 20 at both ends and the installation of self-aligning bearings 200 allow the entire tension spring to swing left and right at a certain angle, providing universal tension.

[0034] The integrated connector connects to the accumulator 3 via a threaded interface and to the master cylinder via a thread.

[0035] The connector 4 is integrally formed and is sleeved on the outer periphery of the end of the cylinder 1. The piston rod 2 is coaxially connected to the cylinder 1 through the connector 4.

[0036] Accumulator 3 is filled with nitrogen. One end of accumulator 3 connected to cylinder 1 is filled with hydraulic oil, and the bottom of accumulator 3 is filled with nitrogen to provide kinetic energy. This accumulator 3 is a diaphragm accumulator 3, which is stable in operation, leak-free, and capable of long-term operation, with high stability, high sealing performance, and long service life.

[0037] The connector 4 has a connecting through hole 40 in the middle that can cooperate with the cylinder 1 and the piston rod 2. The two sides of the connecting through hole 40 are respectively connected to the first channel 41 and the second channel 42 that can be connected to the accumulator 3.

[0038] The connector 4 is designed as a single unit, connecting the accumulator 3. An internal channel connects the accumulator 3 to the cylinder 1. As a one-piece alloy connector with an internal flow channel, it provides a larger flow path, shortens the oil circuit length, improves response speed, and reduces pressure loss. Furthermore, it eliminates the need for external piping, reduces space occupation, and results in a more compact and reliable structure.

[0039] The connecting member 4 has a guide bushing 43 extending towards the piston rod 2 in the middle. The guide bushing 43 serves as a guide, making the piston rod 2 move more smoothly.

[0040] like Figure 3 As shown, at least one set of sealing grooves 430 are provided circumferentially on the inner wall of the guide sleeve 43. By setting a sealing ring at the sealing groove 430, the purpose of dust prevention and leakage prevention is achieved.

[0041] like Figure 1 , Figure 5 , Figure 6 As shown, a positioning structure 6 that cooperates with the cylinder body 1 is provided at the bottom of the connector 4. The positioning structure 6 includes a positioning piece 60 and a positioning groove 10 opened on the peripheral wall of the cylinder body 1. The edge of the positioning piece 60 is provided with a positioning protrusion 62 that can extend into the positioning groove 10.

[0042] The positioning structure 6 can prevent the cylinder 1 from rotating relative to the connecting part 4 due to vibration after the cylinder 1 is assembled with the connecting part 4, so that the two can maintain the original connection quality.

[0043] Specifically, the positioning piece 60 has at least two fastening through holes 61. The positioning piece 60 is fixedly installed on the bottom of the connector 4 by using fasteners 610, such as bolts, which engage with the fastening through holes 61.

[0044] A pressure gauge 7, which communicates with the second channel 42, is connected to the connector 4. The structure of the pressure gauge 7 is not specifically limited; it can be mechanical or electronic / digital. The pressure gauge 7 can display the pressure of the internal hydraulic oil in a timely manner.

[0045] This nitrogen-accumulated hydraulic tension spring has a flat tension curve, meaning the difference between the initial and final tension forces is small, providing a more stable and continuous tension for the equipment. The charging pressure of the accumulator 3 can be set according to different application scenarios, allowing the nitrogen-accumulated hydraulic tension spring to achieve varying tensions. The integrated design process results in higher structural strength and stability, and the internal hydraulic oil channels are machined, offering stability and high flow rate.

[0046] Furthermore, the connector 4 is provided with a valve connection port 44 and an oil filling hole 45 that communicates with the first channel 41.

[0047] Furthermore, the accumulator 3 has an air inlet 30 at its bottom.

[0048] During operation, the tension spring generates negative pressure. When the piston is stretched, hydraulic oil flows back to the accumulator 3. The longer the piston rod 2 is stretched, the greater the retraction force (tension). The size of the accumulator 3 determines the compression ratio of the tension spring, meaning that the tension of the tension spring can be changed by adjusting the charging pressure of the accumulator 3.

[0049] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A nitrogen-storage hydraulic tension spring, characterized in that, include: Cylinder block (1); Piston rod (2); The connector (4) is integrally formed and is sleeved on the outer periphery of the end of the cylinder (1). The piston rod (2) is coaxially connected to the cylinder (1) through the connector (4). Accumulator (3), filled with nitrogen gas; The connector (4) has a connecting through hole (40) in the middle that can cooperate with the cylinder (1) and piston rod (2). The two sides of the connecting through hole (40) are respectively connected to a first channel (41) and a second channel (42) that can be connected to the accumulator (3).

2. The nitrogen-storage hydraulic tension spring as described in claim 1, characterized in that: The connector (4) has a guide bushing (43) extending toward the piston rod (2) in the middle.

3. The nitrogen-storage hydraulic tension spring as described in claim 2, characterized in that: The inner wall of the guide sleeve (43) is provided with at least one set of sealing grooves (430) in the circumferential direction.

4. A nitrogen-storage hydraulic tension spring as described in claim 1, 2, or 3, characterized in that: The bottom of the connector (4) is provided with a positioning structure (6) that cooperates with the cylinder (1). The positioning structure (6) includes a positioning piece (60) and a positioning groove (10) opened on the peripheral wall of the cylinder (1). The edge of the positioning piece (60) is provided with a positioning protrusion (62) that can extend into the positioning groove (10).

5. A nitrogen-storage hydraulic tension spring as described in claim 4, characterized in that: The positioning piece (60) has at least two fastening through holes (61).

6. A nitrogen-storage hydraulic tension spring as described in claim 1, 2, 3, or 5, characterized in that: A pressure gauge (7) connected to the second channel (42) is attached to the connector (4).

7. A nitrogen-storage hydraulic tension spring as described in claim 6, characterized in that: The connector (4) is provided with a valve connection port (44) and an oil filling hole (45) that communicates with the first channel (41).

8. A nitrogen-storage hydraulic tension spring as described in claim 1, characterized in that: The accumulator (3) has an air inlet (30) at its bottom.

9. A nitrogen-storage hydraulic tension spring as described in claim 1, characterized in that: The cylinder (1) and piston rod (2) are provided with ear rings (20) at their ends, and self-aligning bearings (200) are mounted on the ear rings (20).

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