Round number limiting mechanism, potentiometer and encoder
By designing a rotation limit mechanism and using threaded transmission and a stop structure to precisely limit the rotation shaft, the problem of poor control accuracy of multi-turn potentiometers and encoder rotation shafts is solved, and precise rotation control and smooth operation are improved.
Patent Information
- Application Number
- CN202423143295.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-19
AI Technical Summary
Existing technologies struggle to precisely limit the rotation of multi-turn potentiometers and encoder shafts, resulting in poor control accuracy.
A rotation limit mechanism is designed, including a housing, a rotating shaft, and a limit plate. The rotation number of the rotating shaft is precisely limited by a threaded drive and a stop structure. The axial movement range of the limit plate is limited by a starting stop structure and an ending stop structure.
It achieves precise control of the number of turns of the rotating shaft, improving the control accuracy and operational smoothness of multi-turn potentiometers and encoders.
Smart Images
Figure CN223712514U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the electric appliance electric control automation technical field, concretely relates to a number of turns limiting mechanism, potentiometer and encoder. BACKGROUND
[0002] In the industrial automation technical field, the number of turns of single rotation axis is often controlled to realize corresponding function.
[0003] For example, multi-turn potentiometer, in order to increase the angle range of potentiometer, the control knob of multi-turn potentiometer needs to be designed to rotate many turns, and the internal rotating shaft can also rotate several turns correspondingly, in this case, it is difficult to accurately limit the rotation starting point and end point of the rotating shaft, so that the control precision of the corresponding equipment cannot be guaranteed.
[0004] For example, in some application scenarios of encoder, such as measuring the number of turns of vehicle steering wheel, ship rudder, entertainment equipment turntable by encoder, in these application cases, the measurement range of encoder is limited to several turns more than 360 degrees, and because more than 360 degrees means that the measurement shaft of encoder needs to rotate several turns continuously, in this case, it is also difficult to accurately limit the rotation starting point and end point of the measurement shaft, so that the accuracy control of the measurement range of encoder is poor.
[0005] Therefore, it is necessary to design a mechanism capable of accurately limiting the number of turns of the rotating shaft. UTILITY MODEL CONTENTS
[0006] Therefore, one of the purposes of the utility model is to provide a number of turns limiting mechanism to realize the accurate control of the number of turns of the rotating shaft of multi-turn potentiometer, encoder and other industrial control products.
[0007] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:
[0008] A number of turns limiting mechanism, the key is: including the shell and the rotating shaft arranged in the middle of the shell, the rotating shaft can rotate relative to the shell, the shell has an annular chamber, a limiting disc is arranged in the annular chamber, the middle part of the limiting disc is slidably sleeved on the rotating shaft, and the circumferential outer side of the limiting disc is threadedly connected with the side wall of the annular chamber; rotating the rotating shaft can make the limiting disc move along the axial direction of the rotating shaft under the action of screw transmission.
[0009] The annular chamber is respectively provided with a starting stop structure and an end stop structure at both ends in the axial direction, and the movement range of the limiting disc is between the starting stop structure and the end stop structure.
[0010] With the above structure, the limiting disc rotates with the rotating shaft, and under the screw transmission action of the limiting disc circumferential outer side and the annular chamber side wall, the limiting disc can move along the rotating shaft in the axial direction, so that the rotating shaft can rotate continuously for several turns. The annular chamber axial two ends are respectively provided with a starting stop structure and an end stop structure, and the starting stop structure and the end stop structure can accurately limit the sliding range of the limiting disc along the rotating shaft, so that the rotating turns of the rotating shaft can be accurately limited.
[0011] As a preferred, the starting stop structure is a first stop block protruding in the annular chamber, the end stop structure is a second stop block protruding in the annular chamber, and the limiting disc two sides are respectively provided with a starting limiting block and an end limiting block which are both protruding.
[0012] When the limiting disc rotates to the starting stop structure position, the starting limiting block can abut against the first stop block along the rotating tangential direction.
[0013] When the limiting disc rotates to the end stop structure position, the end limiting block can abut against the second stop block along the rotating tangential direction. With the above structure, when the end surface of the starting limiting block relative to the rotating tangential direction of the limiting disc abuts against the first stop block, the limiting disc can stop moving upward, and at the same time, when the starting limiting block abuts against the first stop block, there is a gap between the upper surface of the limiting disc and the lower surface of the first stop block, which can avoid the locking of the limiting disc and the annular chamber side wall, and ensure the smoothness of the rotating shaft. When the limiting disc rotates to the end stop structure position, the end limiting block can abut against the second stop block along the rotating tangential direction, that is, when the end surface of the end limiting block relative to the rotating tangential direction abuts against the second stop block, the limiting disc can stop moving downward, and the rotating shaft stops rotating. At this time, there is a gap between the lower surface of the limiting disc and the upper surface of the second stop block, which avoids the locking of the limiting disc downward and the annular chamber side wall.
[0014] As a preferred, the annular chamber axial two ends are fixedly installed with an upper stop sheet and a lower stop sheet, and the first stop block and the second stop block are respectively arranged on the surfaces of the upper stop sheet and the lower stop sheet. With the above structure, it is convenient for assembly.
[0015] As a preferred, the rotating shaft comprises an outer connecting segment, a sliding connecting segment and an inner connecting segment which are arranged in sequence in the axial direction, the outer connecting segment and the inner connecting segment are both located outside the housing two ends, the sliding connecting segment is located in the annular chamber, the sliding connecting segment is a square shaft, and the limiting disc middle part is provided with a square hole which is adapted to the square shaft. With the above structure, through the sliding cooperation of the square hole and the square shaft, the limiting disc can rotate synchronously with the sliding connecting segment, and at the same time, under the screw transmission action of the limiting disc circumferential outer side and the annular chamber side wall, the limiting disc can move along the rotating shaft in the axial direction.
[0016] As preferred: the shell top end has an upwardly extending mounting portion, a connecting passage is formed in the middle of the mounting portion and communicates with the annular chamber, the external connecting segment penetrates through the connecting passage and extends outwardly, and the external connecting segment is rotationally fitted with the connecting passage.
[0017] As preferred: damping grease and an O-shaped rubber ring are arranged between the external connecting segment and the side wall of the connecting passage. With the above structure, the stability of the rotation of the external connecting segment can be improved, and the rotation of the rotating shaft is provided with operation resistance, and after rotation, the rotating shaft will not rotate freely due to shaking of the equipment, and the operation experience is better.
[0018] The second purpose of the utility model is to provide a potentiometer, including potentiometer base body and relative potentiometer base body rotation setting control shaft, its key lies in: the potentiometer base body one end is equipped with above-mentioned number of turns limiting mechanism, control shaft and number of turns limiting mechanism's rotating shaft integral molding or coaxial fixed connection.
[0019] As preferred: the control knob cap is connected to the control shaft or the rotating shaft.
[0020] As preferred: the potentiometer is a multi-turn speed regulating potentiometer, the potentiometer base body is provided with a main chip, a secondary chip, and a driving gear and a driven gear in meshing transmission, the driving gear is fixedly sleeved at the end of the control shaft, the driving gear is provided with a main magnet opposite to the main chip, and the driven gear is provided with a secondary magnet opposite to the secondary chip. With the above structure,
[0021] The third purpose of the utility model is to provide an encoder, including encoder base body and relative encoder base body rotation setting measurement shaft, its key lies in: the encoder base body one end is equipped with above-mentioned number of turns limiting mechanism, measurement shaft and number of turns limiting mechanism's rotating shaft integral molding or coaxial fixed connection.
[0022] Compared with the prior art, the utility model has the advantages that:
[0023] 1. The number of turns limiting mechanism is used, the rotating shaft is rotated, the limiting disc is synchronously rotated with the rotating shaft, under the screw transmission action of the limiting disc circumferential outside and the annular chamber side wall, the limiting disc can move along the rotating shaft axial direction, on this basis, the axial movement range of the limiting disc is limited by the initial stop structure and the terminal stop structure, that is, the rotation number of the limiting disc is limited, so that the rotation number of the rotating shaft is accurately limited.
[0024] 2. At the starting point, both the starting limit block and the ending limit block abut against the corresponding first stop block and second stop block along the tangential direction of the limit disc. This technical treatment not only provides extremely precise position limiting, but also ensures that the rotating shaft can be controlled to rotate in the opposite direction with relatively light operation or driving force.
[0025] 3. The potentiometer provided by this utility model, because it integrates a rotation limit mechanism, can not only perform continuous multi-turn rotation control to meet a wider angle range, but also precisely limit the potentiometer's control range, thereby improving the control accuracy of the corresponding equipment.
[0026] 4. The encoder provided by this utility model integrates a rotation limit mechanism. During continuous encoder rotation, the rotation limit mechanism acts as a counter. By limiting the start and end points, the encoder's range can be precisely controlled from zero to its maximum value, enriching the encoder's measurement application scenarios. Examples include: hand-cranked steering wheels, ship rudders, and turntables in amusement parks. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the rotation limit mechanism;
[0028] Figure 2 A three-dimensional sectional view of the rotation limit mechanism;
[0029] Figure 3 A schematic diagram of the structure after the upper limit plate 3 is fitted onto the rotating shaft 2;
[0030] Figure 4 This is a cross-sectional view of shell 1;
[0031] Figure 5 This is a three-dimensional sectional view of shell 1;
[0032] Figure 6 To show a three-dimensional sectional view of the starting limit block 3a abutting against the first stop block a in the number of revolutions limiting mechanism;
[0033] Figure 7 A schematic diagram of a potentiometer with an integrated turn limit mechanism;
[0034] Figure 8 A cross-sectional view of a potentiometer with an integrated turn limit mechanism;
[0035] Figure 9 This is a schematic diagram of the encoder's winding limit mechanism. Detailed Implementation
[0036] The present invention will be further described below with reference to the embodiments and accompanying drawings.
[0037] As Figure 1 and Figure 2 shown, a number of turns limiting mechanism, comprising a housing 1 and a rotating shaft 2 through the middle of the housing 1, wherein the rotating shaft 2 can rotate relative to the housing 1. The housing 1 has an annular chamber 1a, the annular chamber 1a is provided with a limiting disc 3, the limiting disc 3 middle slidingly fitted on the rotating shaft 2, the limiting disc 3 circumferential outer side with annular chamber 1a side wall thread connection. Turn rotating shaft 2, can make limiting disc 3 along the rotating shaft 2 axial movement under the action of screw transmission. Annular chamber 1a axial two ends are respectively provided with starting stop structure and end stop structure, the moving range of limiting disc 3 is between starting stop structure and end stop structure.
[0038] Based on the above structure design, rotating shaft 2, limiting disc 3 with rotating shaft 2 synchronous rotation, under the action of screw transmission of limiting disc 3 circumferential outer side and annular chamber 1a side wall, limiting disc 3 along the rotating shaft 2 axial movement, the structure ensures that the rotating shaft 2 can rotate continuously several turns. On this basis, annular chamber 1a axial two ends are respectively provided with starting stop structure and end stop structure, namely as Figure 2 in the annular chamber 1a upper end is provided with starting stop structure, the lower end is provided with end stop structure, starting stop structure and end stop structure can accurately limit the range of limiting disc 3 up and down sliding along the rotating shaft 2, so as to accurately limit the number of turns of rotating shaft 2.
[0039] Further, as Figure 4 and 5 shown, the starting stop structure is the first stop block a protruding in the annular chamber 1a, the end stop structure is the second stop block b protruding in the annular chamber 1a, by Figure 3 It can be seen that the limiting disc 3 upper and lower sides are respectively provided with starting limiting block 3a and end limiting block 3b which are convex. Referring to Figure 2 and Figure 6When the limiting disc 3 is screwed to the starting stop structure position, the starting limiting block 3a can be tangentially abut against the first stop block a along the limiting disc 3, that is, when the end surface of the starting limiting block 3a abuts against the first stop block a, the limiting disc 3 can stop moving upward, and the rotating shaft 2 stops rotating, and at the same time, when the starting limiting block 3a abuts against the first stop block a, there is a gap between the upper surface of the limiting disc 3 and the lower surface of the first stop block a. The advantage of such design is that it can avoid the locking of the limiting disc 3 upward with the side wall of the annular chamber 1a, and ensure the smoothness of the rotating shaft 2. Similarly, when the limiting disc 3 is screwed to the end stop structure position, the end limiting block 3b can be tangentially abut against the second stop block b along the limiting disc 3, that is, when the end surface of the end limiting block 3b abuts against the second stop block b, the limiting disc 3 can stop moving downward, and the rotating shaft 2 stops rotating, and at this time, there is a gap between the lower surface of the limiting disc 3 and the upper surface of the second stop block b, which avoids the locking of the limiting disc 3 downward with the side wall of the annular chamber 1a.
[0040] At the starting position, the starting limiting block 3a is tangentially abut against the first stop block a along the limiting disc 3, and the abutting state is shown in the accompanying drawings Figure 6 , such abutting limiting mode not only can provide extremely accurate position limiting, but also can ensure that the rotating shaft 2 can be controlled to rotate reversely again with relatively light operation or driving force. At the end position, the end limiting block 3b is also abut against the second stop block b in such a way, and the description of the drawings is not repeated.
[0041] Again referring to Figure 4 and 5 , for convenient installation, the annular chamber 1a is fixedly installed with the upper stop sheet 1b and the lower stop sheet 1c at the two axial ends, the first stop block a is arranged on the lower side surface of the upper stop sheet 1b, and the second stop block b is arranged on the upper side surface of the lower stop sheet 1c. The upper stop sheet 1b and the lower stop sheet 1c are both provided with a connecting through hole c in the middle, the rotating shaft 2 penetrates through the two connecting through holes c and can rotate relative to the two connecting through holes c.
[0042] As shown in Figure 2 and 3 , the rotating shaft 2 comprises an outer connecting segment 21, a sliding connecting segment 22 and an inner connecting segment 23 arranged in sequence along the axis, wherein the outer connecting segment 21 and the inner connecting segment 23 are both located outside the housing 1 at the two ends, and the sliding connecting segment 22 is located in the annular chamber 1a. In this embodiment, the sliding connecting segment 22 is a square shaft, and the limiting disc 3 is provided with a square hole in the middle which is adapted to the square shaft. In this way, the limiting disc 3 can rotate with the sliding connecting segment 22, and at the same time, under the action of the thread transmission between the limiting disc 3 and the side wall of the annular chamber 1a, the limiting disc 3 can move axially along the rotating shaft 2.
[0043] Please refer to Figure 2 and 4The top end of the shell 1 has an upwardly extending mounting portion 1d, a connecting passage 12 is formed in the middle of the mounting portion 1d and is in communication with the annular chamber 1a, the external connecting segment 21 penetrates through the connecting passage 12 and extends upwardly, and the external connecting segment 21 is rotationally fitted with the connecting passage 12. By rotating the external connecting segment 21, the overall rotation of the rotating shaft 2 can be controlled.
[0044] Further Figure 2 And 3 A damping grease and an O-shaped rubber ring 4 are arranged between the external connecting segment 21 and the sidewall of the connecting passage 12, and the O-shaped rubber ring 4 improves the stability of the rotation of the external connecting segment 21. Specifically, the external connecting segment 21 is provided with an annular groove matched with the O-shaped rubber ring 4, and the O-shaped rubber ring 4 is sleeved on the annular groove. In this embodiment, the number of O-shaped rubber rings 4 is two. In order to improve the stability of rotation, the transition position of the internal connecting segment 23 and the sliding connecting segment 22 is rotationally supported on the shell by a bearing.
[0045] Further, in order to reduce the friction between the external connecting segment 21 and the sidewall of the connecting passage 12 and prolong the service life of the product, the external connecting segment 21 and the connecting passage 12 are filled with lubricating grease.
[0046] Further Figure 7 And 8 The present embodiment also provides an application example of the turn limit mechanism on the potentiometer, the potentiometer comprising a potentiometer base A and a control shaft 5 rotationally arranged relative to the potentiometer base A, the potentiometer base A and the shell 1 of the turn limit mechanism are both cylindrical structures, the two ends are combined and fixed, one end of the rotating shaft 2 of the turn limit mechanism extends into the potentiometer base A and is integrally formed with or coaxially fixed with the control shaft 5. In the state shown in the drawings of this embodiment, the control shaft 5 and the rotating shaft 2 are integrally formed, that is, the rotating shaft 2 is the control shaft 5. By applying the turn limit mechanism to the potentiometer, the potentiometer can not only be continuously rotated for multiple turns to meet a larger angle range. At the same time, under the positioning action of the start and end stop structures, the control rotation range of the potentiometer can also be accurately limited, thereby improving the control accuracy of the corresponding equipment.
[0047] Further, in order to facilitate control, the rotating shaft 2 is connected with a control knob cap 6, that is, the upper part of the external connecting segment 21 is provided with the control knob cap 6, and rotating the control knob cap 6 can drive the overall rotation of the control shaft 5 to realize point adjustment.
[0048] The potentiometer provided by the embodiment is a multi-turn speed regulating potentiometer, and the potentiometer base A is provided with a main chip 10, a secondary chip 11, and a driving gear 7 and a driven gear 8 in meshing transmission, wherein the driving gear 7 is fixedly sleeved at the lower end of the control shaft 5, the driving gear 7 is provided with a main magnet d which is opposite to the main chip 10, and the driven gear 8 is provided with a secondary magnet e which is opposite to the secondary chip 11. The control shaft 5 drives the driving gear 7 to rotate, thereby driving the driven gear 8 to rotate. The multi-turn speed regulating potentiometer with the structure can control the multi-turn of the potential signal in an absolute value measurement mode, and the working principle is a mature technology in the field of potentiometers, which will not be described in detail here.
[0049] As shown in Figure 9 The embodiment also provides an application example of the turn limiting mechanism on the encoder, and the encoder comprises an encoder base B and a measurement shaft 9 which is rotationally arranged relative to the encoder base B, one end of the encoder base B is provided with the turn limiting mechanism, and the measurement shaft 9 is integrally formed with or coaxially fixedly connected with the rotating shaft 2 of the turn limiting mechanism. Through the accurate control of the turn limiting mechanism on the rotation turns of the measurement shaft 9, the range of the encoder can be accurately controlled.
[0050] Finally, it should be noted that the above description is only preferred embodiments of the present application, and those skilled in the art can make various similar expressions under the inspiration of the present application without departing from the purpose and claims of the present application. Such changes fall within the scope of the present application.
Claims
1. A turn limiting mechanism, characterized by: The application relates to a coil number limiting mechanism, which comprises a shell (1) and a rotating shaft (2) arranged in the middle of the shell (1) and capable of rotating relative to the shell (1), wherein the shell (1) has an annular cavity (1a), a limiting disc (3) is arranged in the annular cavity (1a), the middle of the limiting disc (3) is sleeved on the rotating shaft (2), and the circumferential outer side of the limiting disc (3) is threadedly connected with the side wall of the annular cavity (1a); the rotating shaft (2) is rotated, the limiting disc (3) is moved along the rotating shaft (2) under the action of screw transmission, and the limiting disc (3) is limited in the annular cavity (1a). The annular cavity (1a) is provided with a starting stop structure and an ending stop structure at two axial ends respectively, and the moving range of the limiting disc (3) is between the starting stop structure and the ending stop structure.
2. The number-of-turn position limiting mechanism according to claim 1, characterized by: The starting stop structure is a first stop block (a) protruding in the annular cavity (1a), the ending stop structure is a second stop block (b) protruding in the annular cavity (1a), and the two sides of the limiting disc (3) are respectively provided with a starting limiting block (3a) and an ending limiting block (3b) which are both protruding. When the limiting disc (3) is spirally rotated to the position of the starting stop structure, the starting limiting block (3a) can abut against the first stop block (a) along the tangential direction of rotation. When the limiting disc (3) is spirally rotated to the position of the ending stop structure, the ending limiting block (3b) can abut against the second stop block (b) along the tangential direction of rotation.
3. The number-of-turns limiting mechanism according to claim 2, characterized in that: The annular cavity (1a) is fixedly provided with an upper stop sheet (1b) and a lower stop sheet (1c) at two axial ends, and the first stop block (a) and the second stop block (b) are arranged on the surfaces of the upper stop sheet (1b) and the lower stop sheet (1c) respectively.
4. The number-of-turns limiting mechanism according to claim 1, characterized by: The rotating shaft (2) comprises an outer connecting section (21), a sliding connecting section (22) and an inner connecting section (23) which are arranged in sequence along the axial direction, the outer connecting section (21) and the inner connecting section (23) are both located outside the two ends of the shell (1), the sliding connecting section (22) is located in the annular cavity (1a), the sliding connecting section (22) is a square shaft, and the middle of the limiting disc (3) is provided with a square hole which is matched with the square shaft.
5. The number-of-turns limiting mechanism according to claim 4, characterized in that: The top end of the shell (1) is provided with an installation part (1d) which extends upwards, a connecting channel (12) which is communicated with the annular cavity (1a) is arranged in the middle of the installation part (1d), the outer connecting section (21) penetrates through the connecting channel (12) and extends outward, and the outer connecting section (21) is rotationally matched with the connecting channel (12).
6. The number-of-turns limiting mechanism according to claim 5, characterized in that: Damping grease and an O-shaped rubber ring (4) are arranged between the outer connecting section (21) and the side wall of the connecting channel (12).
7. A potentiometer comprising a potentiometer base and a control shaft (5) arranged in rotation with respect to the potentiometer base, characterized in that: One end of the potentiometer base body is provided with the coil number limiting mechanism, the control shaft (5) is integrally formed with the rotating shaft (2) of the coil number limiting mechanism or is coaxially fixedly connected with the rotating shaft (2) of the coil number limiting mechanism.
8. The potentiometer of claim 7, wherein: The control knob cap (6) is connected to the control shaft (5) or the rotating shaft (2).
9. The potentiometer of claim 7, wherein: The potentiometer is a multi-turn speed regulating potentiometer, the potentiometer base is internally provided with a main chip, a secondary chip and a driving gear (7) and a driven gear (8) in meshing transmission, the driving gear (7) is fixedly sleeved at the end of the control shaft (5), the driving gear (7) is provided with a main magnet which is arranged opposite to the main chip, and the driven gear (8) is provided with a secondary magnet (e) which is arranged opposite to the secondary chip.
10. An encoder comprising an encoder base and a measuring shaft (9) arranged in rotation with respect to the encoder base, characterized in that: The encoder base is provided with the turn number limiting mechanism in any one of claims 1 to 6 at one end, and the measuring shaft (9) is integrally formed with the rotating shaft (2) of the turn number limiting mechanism or is coaxially fixedly connected.