CN112687440B

CN112687440B - Variable resistor assembly and mechanical regulating device

Info

Publication number: CN112687440B
Application number: CN202011103311.2A
Authority: CN
Inventors: 曾信弘
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-18
Filing date: 2020-10-15
Publication date: 2023-05-30
Anticipated expiration: 2040-10-15
Also published as: CN112687440A; TWI709981B; TW202117763A

Abstract

The application discloses a variable resistance assembly and mechanical regulation and control device. The variable resistor assembly includes a first conductive member, a second conductive member, and a rotatable structure. The first conductive member is electrically connected to the first electrode. The second conductive member is electrically connected to the second electrode. The first conductive member and the second conductive member are separated from each other, and the second conductive member is movably disposed above the first conductive member. The rotatable structure is rotatably disposed on the second conductive member and rotatably contacts the first conductive member. The rotatable structure has an arcuate surface that slidably contacts the first conductive member. The second conductive member includes a blocking portion extending toward the first conductive member, and a gap is formed between the blocking portion and the first conductive member to block the passage of foreign matter. Therefore, the variable resistor component and the mechanical regulating device can reduce friction resistance between the rotatable structure and the first conductive piece and avoid foreign matters from contacting the rotatable structure.

Description

Variable resistor assembly and mechanical regulating device

Technical Field

The present application relates to a variable resistor assembly and a mechanical control device, and more particularly, to a variable resistor assembly and a mechanical control device for reducing frictional resistance.

Background

The existing resistance regulator mainly comprises a carbon film and a carbon brush which are contacted with each other. The resistance value is adjusted by the movement of the carbon brush on the carbon film. However, the carbon film and the carbon brush will generate high friction resistance, resulting in loss of the carbon film and the carbon brush and reduced service life.

Disclosure of Invention

The technical problem to be solved by the application is to provide a variable resistor component and a mechanical regulating device aiming at the defects in the prior art.

In one aspect of the present application, a variable resistor assembly is provided that includes a first conductive member, a second conductive member, and a rotatable structure. The first conductive member is electrically connected to the first electrode. The second conductive piece is electrically connected to the second electrode; the first conductive piece and the second conductive piece are separated from each other, and the second conductive piece is movably arranged above the first conductive piece. The rotatable structure is rotatably disposed on the second conductive member and rotatably contacts the first conductive member. Wherein the rotatable structure has an arcuate surface slidably contacting the first conductive member. The second conductive member comprises a blocking portion extending towards the first conductive member, and a gap is formed between the blocking portion and the first conductive member so as to block the passage of foreign matters.

According to another aspect of the present application, a mechanical tuning device is provided that uses a variable resistance assembly that includes a first conductive member, a second conductive member, and a rotatable structure. The first conductive member is electrically connected to the first electrode. The second conductive piece is electrically connected to the second electrode; the first conductive piece and the second conductive piece are separated from each other, and the second conductive piece is movably arranged above the first conductive piece. The rotatable structure is rotatably arranged on the second conductive piece and can rotatably contact the first conductive piece; wherein the rotatable structure has an arcuate surface slidably contacting the first conductive member; the second conductive member comprises a blocking portion extending towards the first conductive member, and a gap is formed between the blocking portion and the first conductive member so as to block the passage of foreign matters.

The application provides a mechanical regulation and control device and variable resistance subassembly thereof, can pass through "rotatable structure rotationally sets up on the second electrically conductive piece and rotationally contact first electrically conductive piece", "rotatable structure has can slidingly contact first electrically conductive piece's arc surface" and "the second electrically conductive piece includes the orientation first electrically conductive piece extended blocking portion, blocking portion with form the clearance between the first electrically conductive piece, with the technical scheme of blocking the passage of foreign matter", in order to reduce rotatable structure with frictional resistance between the first electrically conductive piece, and avoid the foreign matter contact rotatable structure.

For a further understanding of the nature and the technical content of the present application, reference should be made to the following detailed description of the application and the accompanying drawings, which are provided for reference and description only and are not intended to limit the application.

Drawings

Fig. 1 is a schematic top view of a variable resistor assembly according to a first embodiment of the present application.

Fig. 2 is a schematic side view of a variable resistor assembly according to a first embodiment of the present application.

Fig. 3 is a schematic top view of a variable resistor assembly according to a second embodiment of the present application.

Fig. 4 is a schematic top view of a variable resistor assembly according to a third embodiment of the present application.

Fig. 5 is a schematic side view of a variable resistor assembly according to a third embodiment of the present application.

Fig. 6 is a schematic top view of a variable resistor assembly according to a fourth embodiment of the present application.

Fig. 7 is a schematic top view of a variable resistor assembly according to a fifth embodiment of the present application.

Fig. 8 is a schematic side view of a variable resistor assembly according to a fifth embodiment of the present application.

Fig. 9 is a schematic top view of a variable resistor assembly according to a sixth embodiment of the present application.

Fig. 10 is a schematic top view of a variable resistor assembly according to a seventh embodiment of the present application.

Fig. 11 is a schematic side view of a variable resistor assembly according to a seventh embodiment of the present application.

Fig. 12 is a schematic view of a mechanical control device according to an eighth embodiment of the present application.

Fig. 13 is a schematic view of a mechanical control device according to a ninth embodiment of the present application.

Detailed Description

The following specific examples are provided to illustrate the embodiments of the present disclosure related to a "varistor assembly and a mechanical control device", and those skilled in the art will be able to understand the advantages and effects of the present disclosure from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and various obvious aspects, all without departing from the spirit of the present application. The drawings of the present application are merely schematic illustrations, and are not intended to be drawn to actual dimensions. The following embodiments will further illustrate the related art content of the present application in detail, but the disclosure is not intended to limit the scope of the present application.

It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are used primarily to distinguish one element from another element or signal from another signal. In addition, the term "or" as used herein shall include any one or combination of more of the associated listed items as the case may be.

First embodiment

Referring to fig. 1 and 2, a first embodiment of the present application provides a variable resistor assembly S, including: a first conductive member 1, a second conductive member 2, and a rotatable structure 3. In addition, the first conductive member 1 is electrically connected to the first electrode P1, the second conductive member 2 is electrically connected to the second electrode P2, and the rotatable structure 3 is rotatably disposed on the second conductive member 2 and rotatably contacts the first conductive member 1. It should be noted that, as shown in fig. 2, there is a contact point (not numbered) between the rotatable structure 3 and the first conductive member 1, and the resistance value that can be provided by the variable resistor component S can be changed by adjusting the adjustable distance H between the contact point and the end of the first conductive member 1. In addition, the variable resistance element S may be a resistance adjuster.

Further, the first conductive element 1 and the second conductive element 2 can be made of any conductive material. For example, the first conductive member 1 may be a carbon film or any other conductive material, and the second conductive member 2 may be a carbon brush or any other conductive material, however, the application is not limited thereto. The first electrode P1 and the second electrode P2 may be a positive electrode and a negative electrode, respectively, or the first electrode P1 and the second electrode P2 may be a negative electrode and a positive electrode, respectively.

Further, the first conductive member 1 and the second conductive member 2 are separated from each other, and the second conductive member 2 is movably disposed above the first conductive member 1. For example, the second conductive member 2 can move linearly over the first conductive member 1, or the second conductive member 2 can move arcuately over the first conductive member 1. In addition, the second conductive member 2 may be an elastic conductive member for providing a predetermined elastic force, so the rotatable structure 3 can be pushed down against the first conductive member 1 by the elastic force provided by the second conductive member 2.

Still further, the rotatable structure 3 has an arcuate surface that slidably contacts the first conductive member 1, thereby reducing the frictional resistance (or coefficient of friction) between the rotatable structure 3 and the first conductive member 1. That is, when the second conductive member 2 drives the rotatable structure 3 to contact the first conductive member 1, since the rotatable structure 3 slidingly contacts the first conductive member 1 with its arc surface, the friction resistance (or friction coefficient) between the rotatable structure 3 and the first conductive member 1 is reduced, and the wear rate of both the rotatable structure 3 and the first conductive member 1 is reduced. Thus, the service life and product reliability of the variable resistor assembly S can be improved by the use of the rotatable structure 3.

For example, the second conductive member 2 has two extension arms 21 corresponding to each other and a receiving space 22 formed between the two extension arms 21. In addition, the rotatable structure 3 includes a pivot shaft 30 and a pivot roller 31. The pivot shaft 30 is connected between the two extension arms 21 and is accommodated in the accommodating space 22, and the pivot roller 31 can be pivotally disposed on the pivot shaft 30 and partially exposed outside the accommodating space 22. In addition, the pivoting roller 31 has an arc surface 310 slidably contacting the first conductive member 1.

Therefore, since the pivoting roller 31 has the arc surface 310 that slidably contacts the first conductive member 1, the friction resistance (or friction coefficient) between the pivoting roller 31 and the first conductive member 1 is reduced, and the wear rates of the pivoting roller 31 and the first conductive member 1 are also reduced. Therefore, the service life and product reliability of the variable resistor assembly S can be improved by using the pivoting roller 31.

In addition, the second conductive member 2 of the present application may further include at least one blocking portion 24 extending toward the first conductive member 1, and a gap d is formed between the at least one blocking portion 24 and the first conductive member 1 to block the passage of foreign materials. For example, as shown in fig. 1 and fig. 2, the second conductive member 2 further has at least one blocking portion 24, wherein in the present embodiment, two blocking portions 24 corresponding to each other are taken as an example, but not limited to this. For example, as shown in fig. 1 and 2, the second conductive member 2 of the present application has two blocking portions 24 on one surface corresponding to the first conductive member 1. The setting direction of the blocking portion 24 is perpendicular to the displacement direction of the rotatable structure 3, but not limited thereto. Therefore, the variable resistor assembly S of the present application can block the external foreign matters from entering the accommodating space 22 through the blocking portion 24, so as to prevent the external foreign matters from sticking and adhering to the pivot roller 31, thereby affecting and reducing the accuracy of the rotatable structure 3 to sense the first conductive member 1. Wherein the foreign matter can be sand dust, fly ash, dust or other substances, the size of the sand dust is between 90 and 2000 microns, the size of the fly ash is between 3 and 80 microns, and the size of the dust is between 0.9 and 120 microns; therefore, the size of the gap d of the present application may be changed according to the object size of the foreign matter to be blocked. In other words, the size of the gap d may be between 0.9 and 2000 and include any positive integer (in microns) from 1 to 2000.

However, the above examples are only one of possible embodiments and are not intended to limit the present application.

Second embodiment

Referring to fig. 3, a second embodiment of the present application provides a variable resistor assembly S, including: a first conductive member 1, a second conductive member 2, and a rotatable structure 3. As can be seen from a comparison of fig. 3 and fig. 1, the second embodiment of the present application is different from the first embodiment in that: the first embodiment uses a "pivoting roller 31 having an arc surface 310" (as shown in fig. 1), while the second embodiment uses a "pivoting roller 32 having a spherical surface 320" (as shown in fig. 3). Thus, the rotatable structure 3 may be "using a pivoting roller 31 having an arc surface 310" (as shown in fig. 1), or "using a pivoting roller 32 having a spherical surface 320" (as shown in fig. 3), depending on different requirements.

Further, as shown in fig. 3, the rotatable structure 3 includes a pivot shaft 30 and a pivot ball 32. The pivot shaft 30 is connected between the two extension arms 21 and is accommodated in the accommodating space 22, and the pivot ball 32 can be pivotally disposed on the pivot shaft 30 and partially exposed outside the accommodating space 22. In addition, the pivoting ball 32 has a spherical surface 320 that slidably contacts the first conductive member 1.

Therefore, since the pivot ball 32 has the spherical surface 320 slidably contacting the first conductive member 1, the friction resistance between the pivot ball 32 and the first conductive member 1 is reduced, and the wear rate of the pivot ball 32 and the first conductive member 1 is also reduced. Thus, the life and product reliability of the variable resistor assembly S can be improved by the use of the pivot ball 32.

In addition, as shown in fig. 3, the second conductive member 2 in the present embodiment may also include at least one blocking portion 24 extending toward the first conductive member 1, and two blocking portions 24 corresponding to each other are taken as an example in the present embodiment, but not limited thereto. Therefore, by the arrangement of the blocking portion 24, the external foreign matters can be blocked from entering the accommodating space 22 during the displacement of the pivot ball 32, so as to prevent the external foreign matters from adhering to the pivot ball 32, thereby affecting and reducing the accuracy of the rotatable structure 3 in sensing the first conductive member 1.

Third embodiment

Referring to fig. 4 and 5, a third embodiment of the present application provides a variable resistor assembly S, which includes: a first conductive member 1, a second conductive member 2, and a rotatable structure 3. As can be seen from the comparison between fig. 4 and fig. 1, and the comparison between fig. 5 and fig. 2, the difference between the third embodiment and the first embodiment is that: the second conductive element 2 of the third embodiment has a single extension arm 21.

Further, the rotatable structure 3 includes a pivot shaft 30 and two pivot rollers 31. The pivot shaft 30 penetrates the extension arm 21, and two pivot rollers 31 are pivotally disposed on opposite side ends of the pivot shaft 30 and separated by the extension arm 21. In addition, the pivoting roller 31 has an arc surface 310 slidably contacting the first conductive member 1.

Therefore, since the pivoting roller 31 has the arc surface 310 capable of slidably contacting the first conductive member 1, the friction resistance between the pivoting roller 31 and the first conductive member 1 is reduced, and the wear rates of the pivoting roller 31 and the first conductive member 1 are also reduced. Therefore, the service life and product reliability of the variable resistor assembly S can be improved by using the pivoting roller 31.

In addition, as shown in fig. 4 and fig. 5, the second conductive member 2 in the present embodiment may also include at least one blocking portion 24 extending toward the first conductive member 1, and two blocking portions 24 corresponding to each other are taken as an example in the present embodiment, but not limited thereto. Therefore, by the arrangement of the blocking portion 24, the external foreign matters are blocked from entering the accommodating space 22 during the displacement of the pivoting roller 31, so as to prevent the external foreign matters from adhering to the arc surface 310 of the pivoting roller 31, thereby affecting and reducing the accuracy of the sensing of the first conductive member 1 by the rotatable structure 3.

Fourth embodiment

Referring to fig. 6, a fourth embodiment of the present application provides a variable resistor assembly S, including: a first conductive member 1, a second conductive member 2, and a rotatable structure 3. As can be seen from a comparison of fig. 6 and fig. 4, the fourth embodiment of the present application is different from the third embodiment in that: the third embodiment uses a "pivoting roller 31 having an arc surface 310" (as shown in fig. 4), and the fourth embodiment uses a "pivoting roller 32 having a spherical surface 320" (as shown in fig. 6). Thus, the rotatable structure 3 may be "using a pivoting roller 31 having an arc surface 310" (as shown in fig. 4), or "using a pivoting roller 32 having a spherical surface 320" (as shown in fig. 6), depending on different requirements.

Further, as shown in fig. 6, the rotatable structure 3 includes a pivot shaft 30 and two pivot balls 32. The pivot shaft 30 is capable of penetrating the extension arm 21, and two pivot balls 32 are pivotally disposed on opposite side ends of the pivot shaft 30 and separated by the extension arm 21, respectively. In addition, the pivoting ball 32 has a spherical surface 320 that slidably contacts the first conductive member 1.

In addition, as shown in fig. 6, the second conductive member 2 in the present embodiment may also include at least one blocking portion 24 extending toward the first conductive member 1, and two blocking portions 24 corresponding to each other are taken as an example in the present embodiment, but not limited thereto. Therefore, by the arrangement of the blocking portion 24, the external foreign matters are blocked from entering the accommodating space 22 during the displacement of the pivot ball 32, so as to prevent the external foreign matters from adhering to the spherical surface 320 of the pivot ball 32, thereby affecting and reducing the accuracy of sensing the first conductive member 1 by the rotatable structure 3.

Fifth embodiment

Referring to fig. 7 and 8, a fifth embodiment of the present application provides a variable resistor assembly S, which includes: a first conductive member 1, a second conductive member 2, and a rotatable structure 3. As can be seen from the comparison between fig. 7 and fig. 1, and the comparison between fig. 8 and fig. 2, the difference between the fifth embodiment and the first embodiment is that: the bottom surface of the second conductive member 2 of the fifth embodiment has a groove 23.

Further, the rotatable structure 3 includes a pivot shaft 30 and a pivot roller 31. The pivot shaft 30 is accommodated in the groove 23, and the pivot roller 31 can be pivotally disposed on the pivot shaft 30 and partially exposed outside the groove 23. In addition, the pivoting roller 31 has an arc surface 310 slidably contacting the first conductive member 1.

In addition, as shown in fig. 7 and 8, the second conductive member 2 in the present embodiment may also include at least one blocking portion 24 extending toward the first conductive member 1, and two blocking portions 24 corresponding to each other are taken as an example in the present embodiment, but not limited thereto. Therefore, by the arrangement of the blocking portion 24, the external foreign matters are blocked from entering the accommodating space 22 during the displacement of the pivoting roller 31, so as to prevent the external foreign matters from adhering to the arc surface 310 of the pivoting roller 31, thereby affecting and reducing the accuracy of the sensing of the first conductive member 1 by the rotatable structure 3.

Sixth embodiment

Referring to fig. 9, a sixth embodiment of the present application provides a variable resistor assembly S, including: a first conductive member 1, a second conductive member 2, and a rotatable structure 3. As can be seen from the comparison between fig. 9 and fig. 7, the difference between the sixth embodiment and the fifth embodiment of the present application is that: the fifth embodiment uses a pivoting roller 31 having an arc surface 310 (as shown in fig. 7), and the sixth embodiment uses a pivoting ball 32 having a spherical surface 320 (as shown in fig. 9). Thus, the rotatable structure 3 may be "using a pivoting roller 31 having an arc surface 310" (as shown in fig. 7), or "using a pivoting roller 32 having a spherical surface 320" (as shown in fig. 9), depending on different requirements.

Further, as shown in fig. 9, the rotatable structure 3 includes a pivot shaft 30 and a pivot ball 32. The pivot shaft 30 is received in the recess 23, and the pivot ball 32 can be pivotally disposed on the pivot shaft 30 and partially exposed outside the recess 23. In addition, the pivoting ball 32 has a spherical surface 320 that slidably contacts the first conductive member 1.

In addition, as shown in fig. 7 and 8, the second conductive member 2 in the present embodiment may also include at least one blocking portion 24 extending toward the first conductive member 1, and two blocking portions 24 corresponding to each other are taken as an example in the present embodiment, but not limited thereto. Therefore, by the arrangement of the blocking portion 24, the external foreign matters are blocked from entering the accommodating space 22 during the displacement of the pivot ball 32, so as to prevent the external foreign matters from adhering to the spherical surface 320 of the pivot ball 32, thereby affecting and reducing the accuracy of sensing the first conductive member 1 by the rotatable structure 3.

Seventh embodiment

Referring to fig. 10 and 11, a seventh embodiment of the present application provides a variable resistor assembly S, which includes: a first conductive member 1, a second conductive member 2, and a rotatable structure 3. As can be seen from the comparison between fig. 10 and fig. 1, and the comparison between fig. 11 and fig. 2, the difference between the seventh embodiment and the first embodiment is that: in the seventh embodiment, the bottom surface of the second conductive member 2 has the groove 23, and the rotatable structure 3 includes a rolling ball 33 partially disposed within the groove 23. In addition, the rolling ball 33 is rollably disposed in the groove 23, and the rolling ball 33 has a spherical surface 330 slidably contacting the first conductive member 1.

Thereby, since the rolling ball 33 has the spherical surface 330 slidably contacting the first conductive member 1, the frictional resistance between the rolling ball 33 and the first conductive member 1 is reduced, and the wear rates of both the rolling ball 33 and the first conductive member 1 are also reduced. Therefore, the service life and product reliability of the variable resistance assembly S can be improved by using the rolling ball 33.

It should be noted that, in the present embodiment, the second conductive member 2 may have at least one blocking portion 24, and the blocking portion 24 may have a ring shape, an arc shape, an L shape, a square shape or a geometric shape, and the present embodiment is exemplified by a ring shape, but not limited thereto. Therefore, by the arrangement of the blocking portion 24, the external foreign matters can be blocked from entering the accommodating space 22 during the displacement of the rolling ball 33, so as to prevent the external foreign matters from adhering to and adhering to the spherical surface 330 of the rolling ball 33, thereby affecting and reducing the accuracy of the rotatable structure 3 in sensing the first conductive member 1.

Eighth embodiment

Referring to fig. 12, an eighth embodiment of the present application provides a mechanical adjusting device D. The mechanical regulating device D uses a variable resistance element S, and the variable resistance element S may be any one of the first to seventh embodiments. For example, as shown in fig. 2, the variable resistor assembly S includes a first conductive member 1, a second conductive member 2, and a rotatable structure 3.

Furthermore, the mechanical adjusting device D further includes a control component as shown in fig. 2 and 12. The control component and the variable resistance component S can be matched with each other, and the second conductive member 2 can perform linear movement or arc movement relative to the first conductive member 1 by being driven by the control component. For example, the control component may be a knob R. By rotating the knob R (in the direction indicated by the arrow), the second conductive member 2 can drive the rotatable structure 3 to perform a linear movement or an arc movement on the first conductive member 1, thereby changing the resistance value that can be provided by the variable resistor assembly S.

Ninth embodiment

Referring to fig. 13, a ninth embodiment of the present application provides a mechanical adjusting device D. The mechanical regulating device D uses a variable resistance element S, and the variable resistance element S may be any one of the first to seventh embodiments. For example, as shown in fig. 2, the variable resistor assembly S includes a first conductive member 1, a second conductive member 2, and a rotatable structure 3.

Furthermore, the mechanical adjusting device D further includes a control component as shown in fig. 2 and 13. The control component and the variable resistance component S can be matched with each other, and the second conductive member 2 can perform linear movement or arc movement relative to the first conductive member 1 by being driven by the control component. For example, the control component may be a toggle M. By moving the toggle member M left and right (as indicated by the arrow), the second conductive member 2 can drive the rotatable structure 3 to perform linear movement or arc movement on the first conductive member 1, thereby changing the resistance value that can be provided by the variable resistor assembly S.

However, the above examples are only one possible embodiment and are not intended to limit the present application.

Advantageous effects of the embodiments

One of the advantages of the present application is that, the mechanical adjusting device D and the variable resistor component S thereof provided by the present application can be rotatably disposed on the second conductive member 2 through the rotatable structure 3 and can rotatably contact the first conductive member 1, the rotatable structure 3 has an arc surface that slidably contacts the first conductive member 1, and the second conductive member 2 includes a blocking portion 24 extending toward the first conductive member 1, and a gap D is formed between the blocking portion 24 and the first conductive member 1 to block the passage of foreign matters, so as to reduce the frictional resistance between the rotatable structure 3 and the first conductive member 1 and avoid the foreign matters from contacting the rotatable structure 3.

That is, when the second conductive member 2 drives the rotatable structure 3 to contact the first conductive member 1, since the rotatable structure 3 slidingly contacts the first conductive member 1 with its arc surface, the friction resistance (or friction coefficient) between the rotatable structure 3 and the first conductive member 1 is reduced, and the wear rate of both the rotatable structure 3 and the first conductive member 1 is reduced. Thus, the service life and product reliability of the variable resistor assembly S can be improved by the use of the rotatable structure 3. In addition, in the process of the displacement of the rotatable structure 3, the blocking portion 24 can block the external foreign matters from entering the accommodating space 22, so as to prevent the external foreign matters from sticking and adhering to the rotatable structure 3, thereby affecting and reducing the accuracy of the rotatable structure 3 in sensing the first conductive element 1.

The foregoing disclosure is only a preferred embodiment of the present application and is not intended to limit the scope of the claims of the present application, so that all equivalent technical changes made by the application and the accompanying content are included in the scope of the claims of the present application.

Claims

1. A variable resistor assembly, comprising:

a first conductive member electrically connected to the first electrode;

the second conductive piece is electrically connected to the second electrode; wherein the first conductive member and the second conductive member are separated from each other, and the second conductive member is movably disposed above the first conductive member; and

a rotatable structure rotatably disposed on the second conductive member and rotatably contacting the first conductive member;

wherein the rotatable structure has an arcuate surface slidably contacting the first conductive member;

the second conductive member comprises a blocking portion extending towards the first conductive member, and a gap is formed between the blocking portion and the first conductive member so as to block the passage of foreign matters.

2. The variable resistor assembly according to claim 1, wherein the second conductive member has two extension arms corresponding to each other and a receiving space formed between the two extension arms, the blocking portion extending from the two extension arms; the rotatable structure comprises a pivoting shaft connected between the two extension arms and accommodated in the accommodating space and a pivoting roller which can be pivoted on the pivoting shaft and is partially exposed out of the accommodating space, and the pivoting roller is provided with an arc surface which can be slidably contacted with the first conductive piece so as to reduce friction resistance between the pivoting roller and the first conductive piece; the second conductive piece is an elastic conductive piece for providing a preset elastic force, and the rotatable structure is propped against the first conductive piece downwards through the elastic force provided by the second conductive piece.

3. The variable resistor assembly according to claim 1, wherein the second conductive member has two extension arms corresponding to each other and a receiving space formed between the two extension arms, the blocking portion extending from the two extension arms; the rotatable structure comprises a pivoting shaft connected between the two extension arms and accommodated in the accommodating space and a pivoting rolling ball which can be pivoted on the pivoting shaft and is partially exposed out of the accommodating space, and the pivoting rolling ball is provided with a spherical surface which can be slidably contacted with the first conductive piece so as to reduce friction resistance between the pivoting rolling ball and the first conductive piece; the second conductive piece is an elastic conductive piece for providing a preset elastic force, and the rotatable structure is propped against the first conductive piece downwards through the elastic force provided by the second conductive piece.

4. The variable resistor assembly of claim 1, wherein the second conductive member has an extension arm from which the blocking portion extends; the rotatable structure comprises a pivoting shaft penetrating through the extension arm and two pivoting rollers which are respectively arranged on two opposite side ends of the pivoting shaft in a pivoted manner and are separated by the extension arm, and each pivoting roller is provided with an arc surface capable of slidably contacting the first conductive piece so as to reduce friction resistance between the pivoting roller and the first conductive piece; the second conductive piece is an elastic conductive piece for providing a preset elastic force, and the rotatable structure is propped against the first conductive piece downwards through the elastic force provided by the second conductive piece.

5. The variable resistor assembly of claim 1, wherein the second conductive member has an extension arm from which the blocking portion extends; the rotatable structure comprises a pivoting shaft penetrating through the extension arm and two pivoting rolling balls which are respectively arranged on two opposite side ends of the pivoting shaft in a pivoted mode and are separated by the extension arm, and each pivoting rolling ball is provided with a spherical surface capable of slidably contacting the first conductive piece so as to reduce friction resistance between the pivoting rolling ball and the first conductive piece; the second conductive piece is an elastic conductive piece for providing a preset elastic force, and the rotatable structure is propped against the first conductive piece downwards through the elastic force provided by the second conductive piece.

6. The variable resistor assembly of claim 1, wherein the bottom surface of the second conductive member has a recess; the rotatable structure comprises a pivoting shaft and a pivoting roller, wherein the pivoting shaft is accommodated in the groove, the pivoting roller is pivotally arranged on the pivoting shaft and is partially exposed out of the groove, and the pivoting roller is provided with an arc surface capable of slidably contacting the first conductive piece so as to reduce friction resistance between the pivoting roller and the first conductive piece; the second conductive piece is an elastic conductive piece for providing a preset elastic force, and the rotatable structure is propped against the first conductive piece downwards through the elastic force provided by the second conductive piece.

7. The variable resistor assembly of claim 1, wherein the bottom surface of the second conductive member has a recess; the rotatable structure comprises a pivoting shaft and a pivoting rolling ball, wherein the pivoting shaft is accommodated in the groove, the pivoting rolling ball can be pivotally arranged on the pivoting shaft and is partially exposed out of the groove, and the pivoting rolling ball is provided with a spherical surface capable of slidably contacting the first conductive piece so as to reduce friction resistance between the pivoting roller and the first conductive piece; the second conductive piece is an elastic conductive piece for providing a preset elastic force, and the rotatable structure is propped against the first conductive piece downwards through the elastic force provided by the second conductive piece.

8. The variable resistor assembly of claim 1, wherein the bottom surface of the second conductive member has a recess; wherein the rotatable structure comprises a rolling sphere partially disposed within the groove, and the rolling sphere has a spherical surface slidably contacting the first conductive member to reduce frictional resistance between the rolling sphere and the first conductive member; the second conductive piece is an elastic conductive piece for providing a preset elastic force, and the rotatable structure is propped against the first conductive piece downwards through the elastic force provided by the second conductive piece.

9. A mechanical tuning device using a variable resistance assembly, the variable resistance assembly comprising:

a first conductive member electrically connected to the first electrode;

10. The mechanical tuning device of claim 9, further comprising: the control assembly is matched with the variable resistor assembly, and the second conductive piece is driven by the control assembly to perform linear movement or arc movement relative to the first conductive piece.