阅读说明：本技术 一种丝杠位移自检测式液压缸 (Lead screw displacement self-detecting hydraulic cylinder ) 是由 张虹源 刘庆教 李小明 徐振宇 于 2020-12-04 设计创作，主要内容包括：本发明公布一种丝杠位移自检测式液压缸,属于液压缸技术领域。包括缸筒和活塞杆,缸筒左端固定有缸底,活塞杆左端安装有活塞；活塞杆轴心安装有丝杠,丝杠左端穿过有缸底轴心；丝杠与缸底转动接触,丝杠与缸底接触部位安装有密封装置；活塞杆上固定有螺套,螺套配合安装在丝杠上；缸底左侧固定有旋转检测装置,旋转检测装置用于检测丝杠左端的转动数据。本发明使用丝杠螺母结构的特点,将活塞杆的直线运动转化为旋转运动,并根据丝杠的转数测出活塞杆的位移；测量方便,适用于长时间工作在高温高压的油液环境中,同时能够适应高频压力脉冲环境,稳定性很高；结构简单易行,经济实用,可以在多种油缸中进行推广使用。(The invention discloses a lead screw displacement self-detection type hydraulic cylinder, and belongs to the technical field of hydraulic cylinders. The cylinder comprises a cylinder barrel and a piston rod, wherein the left end of the cylinder barrel is fixed with a cylinder bottom, and the left end of the piston rod is provided with a piston; the axis of the piston rod is provided with a lead screw, and the left end of the lead screw penetrates through the axis of the cylinder bottom; the screw rod is in rotating contact with the cylinder bottom, and a sealing device is arranged at the contact part of the screw rod and the cylinder bottom; a threaded sleeve is fixed on the piston rod and is arranged on the lead screw in a matching way; and a rotation detection device is fixed on the left side of the cylinder bottom and is used for detecting the rotation data of the left end of the screw rod. The invention uses the characteristics of a screw nut structure to convert the linear motion of the piston rod into rotary motion, and measures the displacement of the piston rod according to the revolution of the screw; the device is convenient to measure, is suitable for working in a high-temperature and high-pressure oil environment for a long time, can adapt to a high-frequency pressure pulse environment and has high stability; the structure is simple and feasible, economical and practical, and can be popularized and used in various oil cylinders.)

1. A lead screw displacement self-detection type hydraulic cylinder comprises a cylinder barrel and a piston rod (8), wherein a cylinder bottom (3) is fixed at the left end of the cylinder barrel, and a piston (7) is installed at the left end of the piston rod (8); the method is characterized in that: the shaft center of the piston rod (8) is provided with a lead screw (6), and the left end of the lead screw (6) penetrates through the shaft center of the cylinder bottom (3); the screw rod (6) is in rotary contact with the cylinder bottom (3), and a sealing device is arranged at the contact part of the screw rod (6) and the cylinder bottom (3); a threaded sleeve (5) is fixed on the piston rod (8), and the threaded sleeve (5) is installed on the lead screw (6) in a matching way; and a rotation detection device (1) is fixed on the left side of the cylinder bottom (3), and the rotation detection device (1) is used for detecting rotation data of the left end of the lead screw (6).

2. The lead screw displacement self-detecting hydraulic cylinder according to claim 1, characterized in that: a core pipe (9) is fixed at the axis of the piston rod (8); the lead screw (6) is positioned in the core pipe (9), a sliding support (10) is fixed at the right end of the lead screw (6), and the sliding support (10) is in sliding fit with the inner wall of the core pipe (9); the right end of the core tube (9) is provided with an oil passing hole.

3. The lead screw displacement self-detecting hydraulic cylinder according to claim 1, characterized in that: the right end of the piston (7) is sleeved and fixed outside the left end of the piston rod (8), and the threaded sleeve (5) is sleeved and fixed in the left end of the piston (7).

4. The lead screw displacement self-detecting hydraulic cylinder according to claim 1, characterized in that: a sunk groove is formed in the left end shaft center of the cylinder bottom (3), and a double-row sealed angular contact ball bearing (4) is installed between the sunk groove of the cylinder bottom (3) and the left end of the lead screw (6).

5. The lead screw displacement self-detecting hydraulic cylinder according to claim 1, characterized in that: the cylinder bottom (3) is fixed with a protective cover (2) at the left end, and the rotation detection device (1) is located in the protective cover (2).

Technical Field

The invention relates to the technical field of hydraulic cylinders, in particular to a lead screw displacement self-detection type hydraulic cylinder.

Background

The hydraulic cylinder is used as an actuating element of a hydraulic system, has the characteristics of simple transmission structure, flexible action, capability of transferring acting force and the like, and is widely used in engineering machinery. The displacement measuring device has great progress in recent years, from an external displacement sensor to a built-in physical sensor and then to a detection scale engraved on a piston rod, and the structures respectively have the characteristics and the practicability.

The displacement measurement is carried out by using the magnetic displacement sensor and combining structures such as a waveguide tube, a magnetic ring and a supporting block in the piston rod, and the overall displacement measurement is carried out by using a built-in sensor.

The external piston rod displacement sensor occupies the space outside the oil cylinder, is complex to install and is difficult to use under the working condition of narrow space;

the built-in stroke sensing hydraulic cylinder is adopted, the effects of ultrasonic waves, photoelectricity and the like are utilized for working, the defects that assembly is complex, processing and production are difficult, a certain application range exists, if the hydraulic cylinder cannot be placed in high-temperature and high-pressure oil for a long time, parts are easy to wear, the hydraulic cylinder cannot adapt to the environment of high-frequency pulse pressure, and the like, and meanwhile, the hydraulic cylinder is not easy to maintain when a fault occurs.

The scale is manufactured on the piston rod, and then the measurement is carried out through the external magnetic sensor, although the measurement precision is high, the scale occupies the external space, the installation precision requirement is high, the protection of the sensor is also highly required, and the scale is not suitable for most hydraulic cylinders.

Disclosure of Invention

In order to solve the technical problem, the invention provides a lead screw displacement self-detection type hydraulic cylinder.

The invention is realized by the following technical scheme: a lead screw displacement self-detection type hydraulic cylinder comprises a cylinder barrel and a piston rod, wherein a cylinder bottom is fixed at the left end of the cylinder barrel, and a piston is installed at the left end of the piston rod; the left end of the screw rod penetrates through the axis of the cylinder bottom; the screw rod is in rotating contact with the cylinder bottom, and a sealing device is arranged at the contact part of the screw rod and the cylinder bottom; a threaded sleeve is fixed on the piston rod and is arranged on the lead screw in a matching way; and a rotation detection device is fixed on the left side of the cylinder bottom and is used for detecting rotation data of the left end of the lead screw.

It further comprises the following steps: a core pipe is fixed at the axis of the piston rod; the lead screw is positioned in the core pipe, a sliding support is fixed at the right end of the lead screw, and the sliding support is in sliding fit with the inner wall of the core pipe; the right end of the core pipe is provided with an oil passing hole.

The right end of the piston is sleeved and fixed outside the left end of the piston rod, and the threaded sleeve is sleeved and fixed in the left end of the piston.

A sunk groove is formed in the shaft center of the left end of the cylinder bottom, and a double-row sealed angular contact ball bearing is mounted between the sunk groove of the cylinder bottom and the left end of the lead screw.

A protective cover is fixed at the left end of the cylinder bottom, and the rotation detection device is located in the protective cover.

Compared with the prior art, the invention has the beneficial effects that: the linear motion of the piston rod is converted into rotary motion by using the characteristics of the screw nut structure, and the displacement of the piston rod is measured according to the revolution of the screw; the structure is a mechanical structure, the principle is simple, the measurement is convenient, the device is suitable for working in a high-temperature and high-pressure oil environment for a long time, and meanwhile, the device can be suitable for a high-frequency pressure pulse environment and has high stability; the structure is simple and feasible, economical and practical, has high stability, reliability and good implementability, and can be popularized and used in various oil cylinders.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of the left portion of FIG. 1;

in the figure: the method comprises the following steps of 1-a rotation detection device, 2-a protective cover, 3-a cylinder bottom, 4-a double-row sealed angular contact ball bearing, 5-a threaded sleeve, 6-a lead screw, 7-a piston, 8-a piston rod, 9-a core pipe and 10-a sliding support.

Detailed Description

The following is a specific embodiment of the present invention, which will be further described with reference to the accompanying drawings.

Referring to fig. 1 and 2, the lead screw displacement self-detecting hydraulic cylinder comprises a cylinder barrel and a piston rod 8, wherein a cylinder bottom 3 is fixed at the left end of the cylinder barrel, and a piston 7 is installed at the left end of the piston rod 8.

A core tube 9 is fixed at the axis of the piston rod 8, the lead screw 6 is positioned in the core tube 9, and the left end of the lead screw 6 penetrates through the axis of the cylinder bottom 3; the screw rod 6 is in rotary contact with the cylinder bottom 3, and a sealing device is arranged at the contact part of the screw rod 6 and the cylinder bottom 3; a sliding support 10 is fixed at the right end of the screw rod 6, and the sliding support 10 is in sliding fit with the inner wall of the core pipe 9; the right end of the core tube 9 is provided with an oil passing hole.

The right end of the piston 7 is sleeved and fixed outside the left end of the piston rod 8. The threaded sleeve 5 is sleeved in the left end of the fixed piston 7, and the threaded sleeve 5 is installed on the lead screw 6 in a matching mode.

A sunk groove is formed in the left end shaft center of the cylinder bottom 3, and a double-row sealed angular contact ball bearing 4 is arranged between the sunk groove of the cylinder bottom 3 and the left end of the lead screw 6. A rotation detection device 1 is fixed on the left side of the cylinder bottom 3, and the rotation detection device 1 is used for detecting rotation data of the left end of the screw rod 6. A protective cover 2 is fixed at the left end of the cylinder bottom 3, and the rotation detection device 1 is positioned in the protective cover 2.

During installation, the threaded sleeve 5 is screwed on the lead screw 6, the lead screw 6 is placed in the core pipe 9, then the cylinder bottom 3 is installed and fixed through bolts, and then the double-row sealed angular contact ball bearing 4, the rotation detection device 1 and the protective cover 2 are sequentially installed and fixed through bolts.

The working principle is as follows:

when the hydraulic cylinder starts to work, the piston rod 8 extends outwards, the piston rod 8 cannot rotate in the axial direction, the lead screw 6 is provided with a threaded structure, the lead screw 6 can rotate when the piston rod 8 extends out, the double-row sealing angular contact ball bearing 4 can ensure that the cylinder bottom 3 cannot move relatively, and the externally connected rotation detection device 1 can display the real-time displacement condition of the piston rod 8 according to the rotating revolution number and the screw pitch of the lead screw 6.

This embodiment is through setting up a screw nut structure in the piston rod inside, when the piston rod stretches out and retracts, turns into rotary motion with linear motion to can obtain the real-time displacement of piston rod through screw nut's pitch and rotatory revolution, can simple and efficient realize the measurement of hydro-cylinder displacement, applicable in the pneumatic cylinder of taking the core pipe, for example horizontal hydro-cylinder etc.. The piston rod structure can also be used for a hollow piston rod structure with a proper size, is convenient to improve and is easy to popularize and use.

This embodiment is through setting up simple screw nut mechanical structure in piston rod inside to set up the real-time displacement that the piston rod was measured to the sensor outside, replace all kinds of complicated sensors that set up in the pneumatic cylinder inside, when very big reduction of cost, also had higher measurement accuracy. Meanwhile, the lead screw is soaked in oil liquid during working, so that the lead screw is excellent in lubricating property and corrosion resistance and easy to maintain the structure. In addition, the structure is not influenced by high-pressure oil, can be used in any high-temperature high-pressure oil, can adapt to a high-frequency pressure pulse environment, has high stability and reliability, is high in universality and feasibility, can be popularized on various oil cylinders, and is easy to realize structural improvement. The device is different from complex principles and high cost of other sensors, and a large amount of space required by an external piston rod sensor, so that the real-time measurement of the stroke of the oil cylinder is realized in an optimal and practical mode.