阅读说明：本技术 一种高精度油缸位移传感器及液压油缸 (High-precision oil cylinder displacement sensor and hydraulic oil cylinder ) 是由 吴学远 张文勇 柳伟锋 孙萌 吕璐 于 2021-07-12 设计创作，主要内容包括：本发明涉及一种油缸位移传感器及液压油缸,特别涉及一种高精度油缸位移传感器及液压油缸。该高精度油缸位移传感器包括：拉线,依次绕设于旋转轴和绕线轴,两端端部分别连接被测物和绕线轴；绕线轴,以多圈环绕的方式绕设拉线,固定拉线端部并张紧拉线；旋转轴,以单圈环绕的方式绕设拉线,在拉线牵拉作用下旋转并输出与拉线位移成比例的信号；感应式编码器,用于测量旋转轴的输出信号,得出被测物位移。本发明通过在对测量精度具有关键影响的旋转轴上只环绕一圈拉线,避免了拉线反复线位移过程中可能产生的多层叠加问题,始终保持旋转轴的角度旋转位移与拉线的线位移之间确定的线性比例关系,消除测量误差,实现无误差的精准测量和定位。(The invention relates to an oil cylinder displacement sensor and a hydraulic oil cylinder, in particular to a high-precision oil cylinder displacement sensor and a hydraulic oil cylinder. This high accuracy hydro-cylinder displacement sensor includes: the pull wire is sequentially wound on the rotating shaft and the winding shaft, and the end parts of two ends of the pull wire are respectively connected with the measured object and the winding shaft; the winding shaft is wound with a pull wire in a multi-coil surrounding mode, fixes the end part of the pull wire and tensions the pull wire; the rotating shaft is wound with a pull wire in a single-ring surrounding mode, rotates under the pulling action of the pull wire and outputs a signal proportional to the displacement of the pull wire; and the induction type encoder is used for measuring the output signal of the rotating shaft to obtain the displacement of the measured object. The invention only surrounds a circle of stay wire on the rotating shaft which has key influence on the measurement precision, thereby avoiding the problem of multilayer superposition possibly generated in the process of repeated linear displacement of the stay wire, always keeping the determined linear proportional relation between the angular rotary displacement of the rotating shaft and the linear displacement of the stay wire, eliminating the measurement error and realizing the accurate measurement and positioning without error.)

1. The utility model provides a high accuracy hydro-cylinder displacement sensor which characterized in that: this high accuracy hydro-cylinder displacement sensor includes:

the pull wire (1) is sequentially wound on the rotating shaft (3) and the winding shaft (2), and the end parts of two ends of the pull wire are respectively connected with the measured object and the winding shaft (2);

the winding shaft (2) is wound with the pull wire (1) in a multi-coil surrounding mode, fixes the end part of the pull wire (1) and tensions the pull wire (1);

the rotating shaft (3) is wound with the pull wire (1) in a single-circle surrounding mode, rotates under the pulling action of the pull wire (1) and outputs a signal proportional to the displacement of the pull wire (1);

and the induction type encoder (4) is used for measuring the output signal of the rotating shaft (3) to obtain the displacement of the measured object.

2. The high-precision oil cylinder displacement sensor according to claim 1, characterized in that: high accuracy hydro-cylinder displacement sensor still includes casing (5), and bobbin (2), rotation axis (3) and induction type encoder (4) are located in casing (5), be equipped with bobbin chamber (501) that are used for holding bobbin (2), rotation axis chamber (502) that are used for holding rotation axis (3), first oil pocket (503) that are used for the oil storage, second oil pocket (504) that are used for the oil storage and cavity (505) that are used for holding induction type encoder (4) in casing (5), bobbin (2) are located first oil pocket (503) around establishing the position of acting as go-between, and rotation axis (3) are located second oil pocket (504) around establishing the position of acting as go-between.

3. The high-precision oil cylinder displacement sensor according to claim 2, characterized in that: the winding shaft cavity (501) is communicated with the first oil cavity (503), the cavity (505) and the second oil cavity (504) are respectively communicated with the rotating shaft cavity (502), and a sealing ring (506) used for separating the sealing cavity (505) and the second oil cavity (504) is arranged between the rotating shaft cavity (502) and the rotating shaft (3).

4. The high-precision oil cylinder displacement sensor according to claim 1, characterized in that: the winding shaft (2) comprises a winding shaft body (201), a first bearing (202) and an elastic resetting piece (203), the winding shaft body (201) is sleeved with the first bearing (202), the elastic resetting piece (203) is connected with the winding shaft body (201), and the elastic resetting piece (203) is used for providing force for the winding shaft body (201) to rotate to an initial position to tension the pull wire (1).

5. The high-precision oil cylinder displacement sensor according to claim 4, characterized in that: the wire winding shaft body (201) is provided with a first groove (2011) for winding the pull wire (1).

6. The high-precision oil cylinder displacement sensor according to claim 1, characterized in that: rotation axis (3) are including rotatory axis body (301), second bearing (302) and strong magnet (303), and on rotatory axis body (301) was located in second bearing (302) cover, rotatory axis body (301) tip was located in strong magnet (303), and induction type encoder (4) set up with strong magnet (303) relatively.

7. The high-precision oil cylinder displacement sensor according to claim 6, characterized in that: the rotating shaft body (301) is provided with a second groove (3011) for winding the pull wire (1).

8. The high-precision oil cylinder displacement sensor according to claim 1, characterized in that: the induction type encoder (4) is a magnetoelectric absolute value encoder.

9. The utility model provides a hydraulic cylinder, includes cylinder (6) and piston rod (7), its characterized in that: the end of the cylinder barrel (6) is provided with the high-precision oil cylinder displacement sensor as claimed in any one of claims 1-8, and the pull wire (1) is connected with the piston rod (7).

10. A hydraulic cylinder as claimed in claim 9, characterized by: the pull wire (1) is connected with the center of the end part of the piston rod, and the central axis of the piston rod (7), the pull wire (1), the winding shaft (2) and the rotating shaft (3) are positioned on the same plane around the position where the pull wire is arranged.

Technical Field

The invention relates to an oil cylinder displacement sensor and a hydraulic oil cylinder, in particular to a high-precision oil cylinder displacement sensor and a hydraulic oil cylinder.

Background

The majority of the positioning in the current numerical control machine tool adopts a positioning mode of adding a magnetic grid ruler or a grating ruler to an oil cylinder, wherein the magnetic grid ruler or the grating ruler adopts a mode of externally arranging the magnetic grid ruler or the grating ruler on the oil cylinder. Because the operating environment of the machine tool is generally poor, the conditions of moisture, much dust and much scrap iron exist, and the failure rate of the externally-arranged magnetic grating ruler or grating ruler is very high. In addition, the externally-mounted magnetic grating ruler or grating ruler is also very easy to cause failure or inaccurate positioning of the positioning sensor caused by external collision, and finally causes generation of defective products in batches.

The pull-wire type displacement sensor can be used for positioning in a mode that the sensor is arranged in an oil cylinder, but the pull-wire type displacement sensor in the prior art is mostly of a single structure, all parts are generally arranged in the same space in a shell, oil parts and oil-free parts cannot be completely isolated, and the working precision of all parts is influenced; in addition, in the prior art, the stay wire is wound on a winding wheel in a multi-ring mode, and the condition that the stay wire is not superposed on the winding wheel according to a set mode in the displacement process exists, so that the linear proportional relation between the stay wire displacement and the angle change value is changed, the measurement failure rate is increased, and the positioning stability is influenced; the encoder in the prior art has poor precision and also influences the measurement precision to a certain extent.

The utility model discloses a chinese utility model patent of application number 201020298707.2 discloses a stay-supported linear displacement sensor, the better solution of the anti-S type clockwork spring of adopting the special design wire rope that acts as go-between superposes on the reel, and restraint mechanisms such as adoption uide bushing, uide bushing seat have solved the stay-supported lead-out gap great, act as go-between the problem that easily takes place the skew. However, in order to solve the above problems, more parts are added, the structure is complicated, the manufacturing and installation difficulty is increased, and the large-scale application is not facilitated.

Disclosure of Invention

The invention aims to provide a high-precision oil cylinder displacement sensor, which can realize more accurate positioning and solve the problems in the background technology.

Another objective of the present invention is to provide a hydraulic cylinder, which has a built-in high-precision cylinder displacement sensor, so as to achieve more precise positioning and solve the problems described in the background art.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a high accuracy hydro-cylinder displacement sensor includes:

the pull wire is sequentially wound on the rotating shaft and the winding shaft, and the end parts of two ends of the pull wire are respectively connected with the measured object and the winding shaft;

the winding shaft is wound with a pull wire in a multi-coil surrounding mode, fixes the end part of the pull wire and tensions the pull wire;

the rotating shaft is wound with a pull wire in a single-ring surrounding mode, rotates under the pulling action of the pull wire and outputs a signal proportional to the displacement of the pull wire;

and the induction type encoder is used for measuring the output signal of the rotating shaft to obtain the displacement of the measured object.

Preferably, the high-precision oil cylinder displacement sensor further comprises a shell, the winding shaft, the rotating shaft and the induction type encoder are arranged in the shell, a winding shaft cavity used for containing the winding shaft, a rotating shaft cavity used for containing the rotating shaft, a first oil cavity used for storing oil, a second oil cavity used for storing the oil and a cavity used for containing the induction type encoder are arranged in the shell, the winding shaft is located in the first oil cavity around the position where the stay wire is arranged, and the rotating shaft is located in the second oil cavity around the position where the stay wire is arranged.

Preferably, the winding shaft cavity is communicated with the first oil cavity, the cavity and the second oil cavity are respectively communicated with the rotating shaft cavity, and a sealing ring for separating the sealing cavity from the second oil cavity is arranged between the rotating shaft cavity and the rotating shaft.

Preferably, the spool includes the spool body, first bearing and elasticity piece that resets, and on the spool body was located to first bearing cover, the spool body was connected to elasticity piece that resets, and elasticity piece that resets is used for providing the spool body and circles round to the power of initial position in order to the tensioning act as go-between, the spool body is equipped with and is used for the first recess of establishing the act as go-between around.

Preferably, the rotation axis includes rotatory axis body, second bearing and strong magnet, and on the rotatory axis body was located to the second bearing cover, the rotatory axis body tip was located to the strong magnet, and induction type encoder sets up with the strong magnet is relative, rotatory axis body is equipped with and is used for around the second recess of establishing the acting as go-between.

Preferably, the inductive encoder is a magnetoelectric absolute value encoder.

The utility model provides a hydraulic cylinder, includes cylinder and piston rod, its characterized in that: the end part of the cylinder barrel is provided with the high-precision oil cylinder displacement sensor, and the stay wire is connected with the piston rod.

Preferably, the pull wire is connected with the center of the end part of the piston rod, and the central axis of the piston rod, the pull wire, the part of the winding shaft wound with the pull wire and the part of the rotating shaft wound with the pull wire are positioned on the same plane.

The invention has the beneficial effects that:

(1) the invention only surrounds a circle of stay wire on the rotating shaft which has key influence on the measurement precision, thereby avoiding the problem of multilayer superposition possibly generated in the process of repeated linear displacement of the stay wire, always keeping the determined linear proportional relation between the angular rotary displacement of the rotating shaft and the linear displacement of the stay wire, eliminating the measurement error and realizing the accurate measurement and positioning without error;

(2) the invention realizes the separation of the electric environment and the hydraulic environment through the plurality of inner cavities arranged in the shell and the sealing rings between the inner cavities, so that each part is positioned in a single cavity and is not influenced by moisture, dust and external impact, and the working environment of each part is ensured;

(3) the invention reduces the difficulty of equipment installation, reduces the dependence on people and greatly improves the consistency and stability of the equipment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a high-precision oil cylinder displacement sensor of the present invention;

FIG. 2 is a schematic cross-sectional view A-A of FIG. 1;

FIG. 3 is a schematic diagram of the internal structure of the high-precision oil cylinder displacement sensor of the present invention;

FIG. 4 is a schematic view of the internal structure of the housing of the present invention;

FIG. 5 is a schematic diagram of the internal structure of the hydraulic cylinder of the present invention.

In the figure: 1. bracing wire, 2, spool, 3, rotation axis, 4, induction type encoder, 5, casing, 6, cylinder, 7, piston rod, 201, spool body, 202, first bearing, 203, elasticity piece that resets, 2011, first recess, 301, rotatory axis body, 302, second bearing, 303, strong magnet, 3011, second recess, 501, spool chamber, 502, rotation axis chamber, 503, first oil pocket, 504, second oil pocket, 505, cavity, 506, sealing washer.

Detailed Description

The technical solution of the present invention is further specifically described below by way of specific examples in conjunction with the accompanying drawings. It is to be understood that the practice of the invention is not limited to the following examples, and that any variations and/or modifications may be made thereto without departing from the scope of the invention.

In the present invention, all parts and percentages are by weight, unless otherwise specified, and the equipment and materials used are commercially available or commonly used in the art. The methods in the following examples are conventional in the art unless otherwise specified. The components or devices in the following examples are, unless otherwise specified, standard parts or parts known to those skilled in the art, the structure and principle of which are known to those skilled in the art through technical manuals or through routine experimentation.

Example 1:

as shown in fig. 1 and 2, a high-precision cylinder displacement sensor includes: the pull wire 1 is sequentially wound on the rotating shaft 3 and the winding shaft 2, and the end parts of two ends of the pull wire are respectively connected with a measured object and the winding shaft 2; the winding shaft 2 is wound with the stay wire 1 in a multi-turn surrounding mode, fixes the end part of the stay wire 1 and tensions the stay wire 1; the rotating shaft 3 is wound with the stay wire 1 in a single-circle surrounding mode, rotates under the traction action of the stay wire 1 and outputs a signal proportional to the displacement of the stay wire 1; and the induction type encoder 4 is used for measuring the output signal of the rotating shaft 3 to obtain the displacement of the measured object.

Through above-mentioned technical scheme, spool 2 realizes the storage and the tip fixed function of 1 acting as go-between, and rotation axis 3 realizes converting the linear displacement of 1 acting as go-between into the angular rotation displacement of rotation axis 3, combines the measurement of induction type encoder 4 to the angular rotation, finally realizes the linear displacement of accurate measurement testee. The rotary shaft 3 which has key influence on the measurement precision is only surrounded by one circle of the stay wire 1, so that the problem of multilayer superposition possibly generated in the process of repeated linear displacement of the stay wire 1 is avoided, the determined linear proportional relation between the angular rotary displacement of the rotary shaft 3 and the linear displacement of the stay wire 1 is always kept, the measurement error is eliminated, and the accurate measurement and positioning without errors are realized.

Example 2:

a high accuracy hydro-cylinder displacement sensor includes: the pull wire 1 is sequentially wound on the rotating shaft 3 and the winding shaft 2, and the end parts of two ends of the pull wire are respectively connected with a measured object and the winding shaft 2; the winding shaft 2 is wound with the stay wire 1 in a multi-turn surrounding mode, fixes the end part of the stay wire 1 and tensions the stay wire 1; the rotating shaft 3 is wound with the stay wire 1 in a single-circle surrounding mode, rotates under the traction action of the stay wire 1 and outputs a signal proportional to the displacement of the stay wire 1; the inductive encoder 4 is used for measuring an output signal of the rotating shaft 3 to obtain the displacement of the measured object; the housing 5, the bobbin 2, the rotary shaft 3, and the induction encoder 4 are provided in the housing 5.

As shown in fig. 3, the spool 2 includes a spool body 201, a first bearing 202, and an elastic restoring member 203. The spool body 201 is a cylinder with a plurality of steps, the diameter of the step in the middle of the cylinder is larger than the diameter of other parts of the cylinder, and the step in the middle of the cylinder is provided with a first groove 2011 for winding the pull wire 1. The number of the first bearings 202 is two, the two first bearings are respectively sleeved at two ends of the bobbin 201, and the outer ring of the first bearing 202 is fixedly connected with the housing 5. The elastic restoring member 203 is connected to the spool body 201, and the elastic restoring member 203 is used for providing a force for the spool body 201 to rotate back to the initial position so as to tension the wire 1. The elastic restoring member 203 is a component of the prior art, which is generally a torsion spring, a coil spring or a spiral spring disposed in the housing, and is not described in detail in this embodiment.

The rotary shaft 3 includes a rotary shaft body 301, a second bearing 302, and a ferromagnetic body 303. The rotating shaft body 301 is a cylinder with a plurality of steps, the diameter of the step in the middle of the cylinder is larger than the diameters of other parts of the cylinder, and the step in the middle of the cylinder is provided with a second groove 3011 for winding the pull wire 1. The number of the second bearings 302 is two, the two bearings are respectively sleeved at two ends of the rotating shaft body 301, and the outer ring of the second bearing 302 is fixedly connected with the shell 5. The ferromagnetic member 303 is provided at an end portion of the rotation shaft 301, and generates a magnetic field, and changes the magnetic field according to the rotational movement of the rotation shaft 301.

The induction type encoder 4 and the strong magnet 303 are arranged relatively, the induction type encoder 4 is a magnetoelectric absolute value encoder, and the angle of the whole 360-degree range can be accurately measured through the magnetic field change generated by the rotation of the induction strong magnet 303.

As shown in fig. 4, a bobbin chamber 501 for accommodating the bobbin 2, a rotating shaft chamber 502 for accommodating the rotating shaft 3, a first oil chamber 503 for storing oil, a second oil chamber 504 for storing oil, and a cavity 505 for accommodating the induction encoder 4 are provided in the housing 5. The position of the winding shaft 2 wound with the pull wire is positioned in the first oil chamber 503, and the position of the rotating shaft 3 wound with the pull wire is positioned in the second oil chamber 504. The bobbin chamber 501 and the first oil chamber 503 communicate, and the cavity 505 and the second oil chamber 504 communicate with the rotating shaft chamber 502, respectively. A seal ring 506 for partitioning the seal cavity 505 and the second oil chamber 504 is provided between the rotary shaft chamber 502 and the rotary shaft 3. Through the technical scheme, the stay wire 1 always works in an oil environment, so that the displacement motion of the stay wire is smooth. The second oil chamber 504 is sealed and isolated from the cavity 505, and the cavity 505 is always in an oil-free environment, so that the separation of an electric environment and a hydraulic environment is realized, and the normal working environment of the induction type encoder 4 is ensured.

Example 3:

a hydraulic cylinder comprises a cylinder barrel 6 and a piston rod 7, wherein the end of the cylinder barrel is provided with the high-precision cylinder displacement sensor in the embodiment 2, a stay wire 1 is connected with the center of the end of the piston rod, and the central axis of the piston rod 7, the stay wire 1, the position of the stay wire wound on a winding shaft 2 and the position of the stay wire wound on a rotating shaft 3 are positioned on the same plane.

Through the technical scheme, the mounting difficulty of workers on the hydraulic oil cylinder and the displacement sensor is reduced, the feeding precision of the hydraulic oil cylinder is free from the dependence on mounting workers, and the consistency and the stability of equipment are greatly improved.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.