Closed integrated angular displacement sensor structure

Abstract

The utility model discloses a closed integrated angular displacement sensor structure, which comprises a stator, a rotor, a signal cable, a circular base and a circular upper cover, and is characterized in that the base and the upper cover are oppositely buckled to form a mounting cavity; a shaft hole is formed in the center of the base, a rotating shaft is installed at the shaft hole through a bearing, one end of the rotating shaft is located outside the installation cavity and used for being connected with a detected part rotating shaft, and the other end of the rotating shaft extends into the installation cavity; the stator and the rotor are both located in the mounting cavity, and the rotor sleeves and is fixed on the rotating shaft and is concentric with the rotating shaft; the stator is fixedly connected with the base through a plurality of mounting point positions on the edge of the sizing base, and the stator is positioned between the rotor and the upper cover; and the movable ruler pole piece on the rotor and the fixed ruler pole piece on the stator are parallel up and down and directly face each other. The device is simple in structure and low in cost, and completely meets the conventional measurement precision requirement. Meanwhile, the rotating shaft is connected with a tested part rotating shaft through an external coupling, thereby effectively reducing the installation requirements of a customer.

Description

Technical Field

[0001] The utility model relates to an improvement on the structure of a displacement sensor, in particular to a closed integrated angular displacement sensor structure, belonging to the technical field of angular displacement detection. Background Art

[0002] At present, most angular displacement sensors are installed in a split form, and the main body mainly includes two parts: the stator and the rotor. The measurement method is to install the rotor on the rotating part to be measured, and the stator on the fixed part. The rotation of the rotating part to be measured drives the rotor to move, and the rotation angle of the moving part to be measured is fed back to the rotation angle of the rotor relative to the stator.

[0003] The split angular displacement sensor needs to be installed in two steps, which is not only cumbersome, but also increases the difficulty of installation for the client. At the same time, for the split structure, since the rotor and stator are two separate parts, dust and slag in the working environment are easy to adhere to the device, affecting the life and working reliability of the sensor.

[0004] To solve this problem, the prior art discloses an integrated angular displacement sensor structure (application number 2023108392804), including a stator, a rotor, a signal cable, a positioning plate and an upper cover. The positioning plate and the upper cover are provided with a through hole in the center, and the hollow shaft is arranged in the through hole to form an annular cavity with the positioning plate and the upper cover. An angular contact ball bearing is sleeved on the outer wall of the hollow shaft, and the inner ring of the bearing is pressed by a locking nut at the bottom end of the hollow shaft. An annular elastic connecting plate and a bearing pressure plate are provided in the cavity, and the connecting plate is fixed to the positioning plate, and the bearing pressure plate is fixed to the connecting plate. Both the stator and the rotor are located in the cavity, and the rotor is sleeved on the shoulder of the hollow shaft and fixed thereto; the stator is fixed to the bearing pressure plate, and the upper end of the stator has an annular boss extending toward the center, and the annular boss and the bearing pressure plate clamp the outer ring of the bearing together. A sealing ring is provided between the through hole of the upper cover and the outer wall of the hollow shaft; a sealing ring is also provided between the through hole of the positioning plate and the locking nut. The sensor's integrated design simplifies the installation of external fixed components and measured rotating parts compared to a split structure, solving the tedious two-step installation problem of a split angular displacement sensor, reducing the difficulty of installation on the user side. It also has better dust, oil, chip, and chip fluid resistance, improving its environmental adaptability.

[0005] However, this sensor is mainly designed for ultra-high precision angular displacement measurement. Therefore, when connected to the moving shaft to be measured, the inner hole of the hollow shaft is inserted into the moving shaft to be measured so that the two are concentric and rigidly fixed together by screws. At the same time, an annular elastic connecting plate and a bearing pressure plate are provided inside. The elastic connecting plate is used as a built-in coupling. Stainless steel with a certain elasticity is selected to compensate for manufacturing errors and installation errors, and eliminate the eccentricity of the rotating shaft during movement. As a result, the overall structure of the connecting plate and the sensor is complex and the processing requirements are high. Although the sensor can also be used for conventional precision angular displacement measurement, it has unnecessary high configuration, the cost of use is not cost-effective, and the installation and connection requirements are high. Therefore, it is very necessary to provide an integrated angular displacement sensor that is suitable for conventional measurement accuracy, reduces product costs and reduces installation requirements. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a closed integrated angular displacement sensor structure. The angular displacement sensor has a simple structure and low cost, can reduce installation requirements, and can adapt to harsh working environments.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] The closed integrated angular displacement sensor structure comprises a stator, a rotor and a signal cable, wherein the stator comprises a fixed-size pole piece, a signal circuit board and a fixed-size base; an annular fixed-size groove is provided on the upper surface of the fixed-size base, the fixed-size pole piece and the signal circuit board are installed in the fixed-size groove, the fixed-size pole piece is located above the signal circuit board with the working surface facing upward; the back of the fixed-size pole piece and the back of the signal circuit board are both provided with excitation pads and induction pads and are arranged oppositely, the fixed-size pole piece and the signal circuit board are welded through the pads, and the signal cable is connected to the signal circuit board through the induction pad of the signal circuit board; the rotor comprises a moving scale pole piece and a moving scale base; an annular moving scale groove is provided on the lower surface of the moving scale base, and the moving scale pole piece is glued and fixed on the moving scale base; the moving scale pole piece is ... The movable ruler is in the groove with the working surface facing downward; it is characterized in that: it also includes a circular base and an upper cover, the base and the upper cover are buckled together to form an installation chamber; an axial hole communicating with the installation chamber is provided at the center of the base, a rotating shaft is installed at the axial hole through a bearing, one end of the rotating shaft is located outside the installation chamber as the outer end for connection with the rotating shaft of the measured component, and the other end of the rotating shaft is extended into the installation chamber as the inner end; the stator and the rotor are both located in the installation chamber, the rotor is fixed on the rotating shaft through its own center hole and is concentric with the rotating shaft; the stator is fixedly connected to the base through a number of installation points on the edge of the fixed-size base, and the stator is located between the rotor and the upper cover; the movable ruler pole piece on the rotor and the fixed-size pole piece on the stator are parallel and face each other up and down.

[0009] Furthermore, the outer wall of the rotating shaft has an annular mounting step, and the rotor is fixedly mounted on the upper surface of the mounting step.

[0010] Furthermore, the inner end of the rotating shaft is located in the center hole of the fixed-size base, a lower bearing is provided between the inner end of the rotating shaft and the center hole of the fixed-size base, the bearing between the rotating shaft and the shaft hole of the base is an upper bearing, and the upper bearing and the lower bearing are located on both sides of the installation step and abut against the installation step.

[0011] Furthermore, the center hole of the fixed-size base is a stepped hole, and the lower bearing is clamped and fixed between the step of the stepped hole and the installation step.

[0012] Furthermore, the signal cable passes through the cable hole on the fixed-size base, passes through the fixed-size base, enters the installation chamber, and then passes through the cable outlet hole on the upper cover to be connected to the driver.

[0013] Furthermore, a boss is provided on the inner surface of the upper cover, a rectangular groove is provided on the boss, an arc-shaped groove is provided at the bottom of the rectangular groove, a wire pressing plate is fixed in the rectangular groove, the signal cable is located in the arc-shaped groove and is pressed by the lower surface of the wire pressing plate to prevent the signal cable from shifting, and the arc-shaped groove and the wire pressing plate together form the wire outlet hole.

[0014] Furthermore, an oil seal is provided between the rotating shaft and the hole wall of the base shaft hole, wherein the oil seal is close to the outer end of the rotating shaft relative to the bearing at the shaft hole, and a sealing ring is provided between the upper cover and the base fitting surface; under the action of the oil seal and the sealing ring, the installation chamber forms a closed space.

[0015] Furthermore, the outer end of the rotating shaft has a shoulder structure, the rotating shaft is connected to the coupling through the shoulder structure, and then connected to the rotating shaft of the measured component through the coupling.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. The stator of the utility model is rigidly connected to the base, and the rotor is rigidly connected to the rotating shaft. The overall structure is simple and low in cost, which fully meets the conventional measurement accuracy requirements. At the same time, the rotating shaft is externally placed and connected to the rotating shaft of the measured component by configuring an external coupling, which effectively reduces the customer's installation requirements. The rotor and stator are combined with high-precision bearings, and then the whole is sealed in the housing through sealing elements, so the overall reliability is improved.

[0018] 2. The sensor of the utility model is integrated into a whole, and can be easily installed with external fixed components and the rotating parts to be measured, which solves the cumbersome problem that the split angular displacement sensor needs to be installed in two steps, and reduces the installation difficulty at the user end.

[0019] 3. Through the integrated design of the utility model, this type of angular displacement sensor has better dust, oil, chip, chip fluid and other capabilities than the split sensor, thereby improving its environmental adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the closed integrated angular displacement sensor of the utility model.

[0021] Figure 2 The utility model is a schematic diagram of the rotary shaft structure of the closed integrated angular displacement sensor.

[0022] Figure 3 This is a schematic diagram of the structure of the base of the closed integrated angular displacement sensor of the utility model.

[0023] Figure 4 The utility model is a schematic diagram of the upper cover structure of the closed integrated angular displacement sensor.

[0024] Among them: 1-upper cover; 2-base; 3-rotor; 4-stator; 5-oil seal; 6-rotating shaft; 7-upper bearing; 8-wire pressing plate; 9-signal cable; 10-installation chamber; 11-installation step; 12-lower bearing; 13-boss; 14-sealing ring; DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0026] See also Figure 1-Figure 4The utility model has a closed integrated angular displacement sensor structure, comprising a stator 4, a rotor 3 and a signal cable 9. Specifically, the stator comprises a fixed-size pole piece, a signal circuit board and a fixed-size base; an annular fixed-size groove is provided on the upper surface of the fixed-size base, and the fixed-size pole piece and the signal circuit board are installed in the fixed-size groove, and the fixed-size pole piece is located above the signal circuit board with the working surface facing upward. Excitation pads and induction pads are distributed on the back of the fixed-size pole piece and the back of the signal circuit board and are arranged oppositely. The fixed-size pole piece and the signal circuit board are welded and glued by the pads, and the signal circuit board is fixed to the back of the fixed-size pole piece. The signal cable is connected to the signal circuit board through the induction pad of the signal circuit board. In the embodiment, the signal cable 9 is connected to the female head on the signal circuit board through the male connector on the cable, and the female head is connected to the induction pad. In the embodiment, the fixed-size pole piece and the signal circuit board are formed into a whole by gluing and then potted and filled in the groove of the fixed-size base. The rotor comprises a moving ruler pole piece and a moving ruler base; an annular moving ruler groove is arranged on the lower surface of the moving ruler base, and the moving ruler pole piece is pasted and fixed in the moving ruler groove with the working surface facing downward.

[0027] In order to make the rotor and stator form an integrated structure for easy installation, the utility model also includes a circular base 2 and an upper cover 1, which are buckled together to form an installation chamber 10. An axial hole communicating with the installation chamber is provided at the center of the base 2, and a rotating shaft 6 is installed at the axial hole through an upper bearing 7. One end of the rotating shaft 6 is located outside the installation chamber as an outer end and is used to connect with the rotating shaft of the measured component through a coupling, and the other end of the rotating shaft 6 is extended into the installation chamber 10 as an inner end. The stator 4 and the rotor 3 are both located in the installation chamber 10, and the rotor 3 is fixed on the rotating shaft 6 through its own center hole and is concentric with the rotating shaft 6; the stator 4 is rigidly fixedly connected to the base 2 through a number of installation points on the edge of the fixed-size base, and the stator 4 is located between the rotor 3 and the upper cover 1; the moving scale pole piece on the rotor and the fixed-size pole piece on the stator are parallel and face each other up and down.

[0028] In the embodiment, the outer end of the rotating shaft has a shoulder structure, the rotating shaft is connected to the coupling through the shoulder structure, and then connected to the rotating shaft of the measured component through the coupling.

[0029] See also Figure 2 In order to facilitate the connection between the rotor and the shaft, the utility model has an annular mounting step 11 on the outer wall of the shaft 6, and the rotor 3 is fixedly mounted on the upper surface of the mounting step 11. By setting the step, it is convenient to fix the rotor on the shaft. At the same time, in order to facilitate the installation and positioning of the rotor, the center hole of the movable ruler base is a step hole, the step surface of the step hole faces downward, and the large hole diameter of the step hole just matches the diameter of the shaft installation step, thereby achieving the positioning of the rotor during installation.

[0030] In order to make the rotation of the shaft more stable, the inner end of the shaft 6 is located in the center hole of the fixed-size base, and a lower bearing 12 is provided between the inner end of the shaft and the center hole of the fixed-size base. The bearing between the shaft and the shaft hole of the base is the upper bearing, and the upper bearing 7 and the lower bearing 12 are located on both sides of the installation step 11 and abut against the installation step. The shaft is supported by the two upper and lower bearings to ensure the stability and balance of the shaft rotation process.

[0031] In the present invention, the stator 4 is fixed on the base 2, and the rotor 3 is fixed on the rotating shaft 6. The distance between the stator 4 and the rotor 3 is controlled by the height of the mounting step 11 on the rotating shaft and the mounting position of the bearing.

[0032] The center hole of the fixed-size base is a stepped hole, and the lower bearing 12 is clamped and fixed between the step of the stepped hole and the mounting step. The lower part of the lower bearing is supported by the stepped hole.

[0033] In the present invention, the signal cable 9 passes through the fixed-size base through the wire hole on the fixed-size base and enters the installation chamber, and then passes through the outlet hole on the upper cover 1 to be connected to the driver.

[0034] See also Figure 1 and Figure 4 A boss 13 is provided on the inner surface of the upper cover 1. The upper surface of the boss is basically flush with the lower surface of the fixed-size base. A rectangular groove is provided on the boss, and an arc-shaped groove is provided at the bottom of the rectangular groove. A wire pressing plate 8 is fixed in the rectangular groove by screws. The signal cable 9 is located in the arc-shaped groove, and the lower surface of the wire pressing plate 8 presses the signal cable by tightening the screws to prevent the signal cable from shifting. A wire groove corresponding to the arc-shaped groove is provided on the lower surface of the wire pressing plate. The wire groove is an inferior arc, and the arc-shaped groove is a superior arc. The arc-shaped groove and the wire groove of the wire pressing plate enclose a closed circle and form the outlet hole. After being tightened, the wire pressing plate is flush with the height of the boss. The outlet path of the signal cable is scientific and reasonable. The wire pressing plate is used to ensure that the cable does not shift during the operation of the sensor, which helps to improve the reliability of the sensor operation.

[0035] In order to prevent dust, oil, and cutting fluid from the working environment from entering the sensor, the utility model is provided with a (skeleton) oil seal 5 between the rotating shaft and the hole wall of the base shaft hole, wherein the oil seal 5 is close to the outer end of the rotating shaft relative to the upper bearing 7 at the shaft hole, and a sealing ring 14 is provided between the upper cover 1 and the fitting surface of the base 2. Under the action of the oil seal 5 and the sealing ring 14, the installation chamber 10 forms a closed space, and the fixed-size pole piece, the moving-size pole piece, and the signal circuit board are enclosed in the closed space. In this closed space, the rotor and the stator are arranged from top to bottom. The outer end of the rotating shaft protrudes out of the base and is connected to the rotating shaft of the external measured component through a coupling, which reduces the difficulty of use and installation.

[0036] The utility model specifically implements the displacement measurement: the rotating shaft is rigidly fixedly connected to the rotating shaft of the measured object through a coupling, and there is no need to adjust the concentricity, which reduces the installation requirements. The stator is positioned by the base step, and then the base is locked on a fixed installation surface with screws. At this time, the internal structure has ensured that the fixed-length pole piece on the stator and the moving-length pole piece on the rotor are parallel and concentrically installed. When the rotor follows the rotating shaft and is driven by the rotating shaft to make a rotational motion relative to the stator, the angular displacement of the measured object is reflected in the electrical signal of the capacitance change generated by the moving-length pole piece relative to the fixed-length pole piece, so as to measure the displacement based on the time-grid measurement principle. When the signal cable external driver supplies power to the signal circuit board and the rotor is driven to follow the measured object to make a circular motion, the excitation signal generated by the signal circuit is transmitted to the fixed-length pole piece through the pad connection, and a capacitance will be formed between the fixed-length pole piece and the moving moving-length pole piece due to the change of the electric field, and the moving-length pole piece will transmit the signal received from the fixed-length pole piece according to the change of the capacitance value. A circle of sensing electrodes is distributed on the fixed-size pole piece, which can synchronously reflect the signal received by the moving-size pole piece to the fixed-size pole piece. The fixed-size pole piece then transmits the signal to the signal processing circuit through the sensing pad. After being processed by the signal processing circuit, the angular displacement of the moving-size pole piece relative to the fixed-size pole piece will be converted from an electrical signal into a position relationship, thereby judging the displacement.

[0037] Features and functions of the main components of this utility model:

[0038] The function of the shaft (see the structure) Figure 2 ): Provides a mounting surface for the rotor, and is connected to the measured rotating shaft through a coupling during use, so that the rotor can move in a circular motion synchronously with the measured rotating shaft. Figure 2 The upper end of the coupling has a connecting boss suitable for coupling installation, and the boss on the outermost circle is used to connect with the rotor.

[0039] The function of the base (see the appearance Figure 3 ):

[0040] 1. Protection function: The cover-shaped shell cooperates with the upper cover to form a closed cavity, which is used to prevent dust and oil pollution, etc.

[0041] 2. Fixing function: The positioning boss and mounting screw holes are used for fixing the limit.

[0042] The function of the upper cover (see the appearance Figure 4 ):

[0043] 1. Protection function: It is sealed and connected with the base to form a sealed cavity to prevent dust and oil pollution, etc.

[0044] 2. Fix the signal cable: Press the signal cable onto the upper cover using the wire pressing plate.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described by referring to the preferred embodiments of the utility model, those skilled in the art should understand that various changes can be made in form and details without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. A closed integrated angular displacement sensor structure, comprising a stator, a rotor and a signal cable, wherein the stator comprises a fixed-size pole piece, a signal circuit board and a fixed-size base; an annular fixed-size groove is provided on the upper surface of the fixed-size base, the fixed-size pole piece and the signal circuit board are installed in the fixed-size groove, the fixed-size pole piece is located above the signal circuit board and the working surface faces upward; the back of the fixed-size pole piece and the back of the signal circuit board are both provided with excitation pads and induction pads and are arranged oppositely, the fixed-size pole piece and the signal circuit board are welded through the pads, and the signal cable is connected to the signal circuit board through the induction pad of the signal circuit board; the rotor comprises a moving scale pole piece and a moving scale base; an annular moving scale groove is provided on the lower surface of the moving scale base, the moving scale pole piece is glued and fixed in the moving scale groove and the working surface faces downward; the characteristics are: It also includes a circular base and an upper cover, which are buckled together to form an installation chamber; an axial hole communicating with the installation chamber is provided at the center of the base, a rotating shaft is installed at the axial hole through a bearing, one end of the rotating shaft is located outside the installation chamber as an outer end and is used to be connected with the rotating shaft of the measured component, and the other end of the rotating shaft is extended into the installation chamber as an inner end; the stator and the rotor are both located in the installation chamber, and the rotor is fixed on the rotating shaft through its own center hole and is concentric with the rotating shaft; the stator is fixedly connected to the base through a number of installation points on the edge of the fixed-size base, and the stator is located between the rotor and the upper cover; the moving scale pole piece on the rotor and the fixed-size pole piece on the stator are parallel and directly facing each other up and down.

2. The closed integrated angular displacement sensor structure according to claim 1, characterized in that: The outer wall of the rotating shaft is provided with an annular mounting step, and the rotor is fixedly mounted on the upper surface of the mounting step.

3. The closed integrated angular displacement sensor structure according to claim 2, characterized in that: The inner end of the rotating shaft is located in the center hole of the fixed-size base, and a lower bearing is arranged between the inner end of the rotating shaft and the center hole of the fixed-size base. The bearing between the rotating shaft and the shaft hole of the base is an upper bearing. The upper bearing and the lower bearing are located on both sides of the installation step and abut against the installation step.

4. The closed integrated angular displacement sensor structure according to claim 3, characterized in that: The center hole of the fixed-size base is a stepped hole, and the lower bearing is clamped and fixed between the step of the stepped hole and the installation step.

5. The closed integrated angular displacement sensor structure according to claim 1, characterized in that: The signal cable passes through the cable hole on the fixed-size base, passes out of the fixed-size base and enters the installation chamber, and then passes out from the cable outlet hole on the upper cover to be connected to the driver.

6. The closed integrated angular displacement sensor structure according to claim 5, characterized in that: A boss is provided on the inner surface of the upper cover, a rectangular groove is provided on the boss, an arc-shaped groove is provided at the bottom of the rectangular groove, a wire pressing plate is fixed in the rectangular groove, the signal cable is located in the arc-shaped groove and is pressed by the lower surface of the wire pressing plate to prevent the signal cable from shifting, and the arc-shaped groove and the wire pressing plate together form the wire outlet hole.

7. The closed integrated angular displacement sensor structure according to claim 1, characterized in that: An oil seal is provided between the rotating shaft and the hole wall of the base shaft hole, wherein the oil seal is close to the outer end of the rotating shaft relative to the bearing at the shaft hole, and a sealing ring is provided between the upper cover and the fitting surface of the base; under the action of the oil seal and the sealing ring, the installation chamber forms a closed space.

8. The closed integrated angular displacement sensor structure according to claim 1, characterized in that: The outer end of the rotating shaft has a shoulder structure, and the rotating shaft is connected to the coupling through the shoulder structure, and then connected to the rotating shaft of the measured component through the coupling.

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