Drive plate knob clamp

Abstract

The utility model relates to a dial knob clamp which comprises a fixing assembly and a needle adjusting assembly, the needle adjusting assembly comprises a plurality of needle adjusting pieces which are arranged on the fixing assembly in a scattered mode, the needle adjusting pieces are arranged in parallel, and each needle adjusting piece comprises a movable adjusting needle which can move relative to the fixing assembly. A working end is formed on the movable adjusting needle and can move in the direction close to or away from the fixing assembly; when the universal meter is used, one side of the working end of each movable adjusting pin is in contact with a dial knob on the universal meter, the dial knob protrudes out of the surface of the universal meter by a certain height, the corresponding movable adjusting pins in contact with the dial knob retract, and the other movable adjusting pins are arranged on the peripheral side of the dial knob in a surrounding manner, so that the adaptability is high, and the universal meter can be adjusted according to dial knobs of different shapes and sizes. The movable adjusting pin at the corresponding position retracts to form a concave part, the universality is high, the overall structure is simple, the manufacturing cost is low, and maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of adjustment frock, concretely relates to a dial knob clamp. BACKGROUND

[0002] The multimeter is indispensable to the departments of electric power and electronics, and is generally used for measuring voltage, current and resistance.

[0003] The multimeter includes a pointer multimeter, and in the automatic detection and calibration of the multimeter, a clamp is needed to rotate the dial knob of the multimeter to perform zero adjustment or calibration. SUMMARY

[0004] The utility model discloses a dial knob clamp, which solves the problems of high cost, complex structure, poor universality for different shapes and sizes of dial knobs, and the like in the prior art.

[0005] To achieve the above-mentioned utility model purposes, the utility model adopts the following technical solutions:

[0006] The utility model provides a dial knob clamp, which solves the problems of high cost, complex structure, poor universality for different shapes and sizes of dial knobs, and the like in the prior art.

[0007] The utility model discloses a dial knob clamp, which solves the problems of high cost, complex structure, poor universality for different shapes and sizes of dial knobs, and the like in the prior art.

[0008] The utility model discloses a dial knob clamp, which solves the problems of high cost, complex structure, poor universality for different shapes and sizes of dial knobs, and the like in the prior art.

[0009] In some embodiments of the present application, an outer sleeve is further included, an installation inner cavity is formed in the outer sleeve, the fixing assembly is connected in the installation inner cavity, a limiting portion extending into the installation inner cavity is formed at one end of the outer sleeve close to the working end, and the fixing assembly is connected on the limiting portion.

[0010] In some embodiments of the present application, the needle adjusting member comprises a connecting cylinder and a reset part, a connecting channel is formed in the connecting cylinder, the needle adjusting member is movably connected in the connecting channel through the reset part, and the connecting cylinder is fixed on the fixing assembly.

[0011] In some embodiments of the present application, the fixing assembly comprises a first fixing member and a second fixing member, the first fixing member and the second fixing member are arranged along the axis of the needle adjusting member, and the two ends of the connecting cylinder are fixed on the first fixing member and the second fixing member respectively.

[0012] In some embodiments of the present application, a third fixing member is further arranged on the side of the second fixing member away from the first fixing member, a third channel is formed in the third fixing member, the working end of the needle adjusting member extends to the outside of the third fixing member through the third channel, and the distance L between the working end and the third fixing member is greater than a preset size in the free state of the reset part.

[0013] In some embodiments of the present application, a supporting boss is formed on the end of the connecting cylinder close to the working end, the size of the supporting boss is greater than the size of the outer wall of the connecting cylinder, the supporting boss is arranged between the second fixing member and the third fixing member, a second channel is formed in the second fixing member and matched with the size of the outer wall of the connecting cylinder, and the connecting cylinder extends to the first fixing member through the second channel.

[0014] In some embodiments of the present application, a stepped hole is formed in the first fixing member, comprising a first hole section and a second hole section arranged in sequence along the direction close to the second fixing member, the size of the first hole section is matched with the size of the outer wall of the connecting cylinder, the size of the second hole section is greater than the size of the outer wall of the needle adjusting member and smaller than the size of the outer wall of the connecting cylinder, and the other end of the needle adjusting member extends to the other side of the first fixing member through the second hole section.

[0015] In some embodiments of the present application, the installation inner cavity is cylindrical, a positioning boss is formed in the inner wall of the installation inner cavity, the outer periphery shapes of the first fixing member, the second fixing member and the third fixing member are matched with the installation inner cavity, and the first fixing member, the second fixing member and the third fixing member are respectively formed with a first positioning section, a second positioning section and a third positioning section matched with the positioning boss, so that the stepped hole, the second channel and the third channel are coaxially arranged.

[0016] In some embodiments of the present application, the needle adjusting member comprises a connecting cylinder fixed on the fixing assembly, a connecting channel is formed in the connecting cylinder, the movable needle adjusting member is movably connected in the connecting channel, an inner stop ring is formed at the bottom of the connecting channel, and a stop portion is formed at the end of the movable needle adjusting member away from the working end, the size of the stop portion is greater than the inner diameter of the inner stop ring.

[0017] In some embodiments of the present application, a closed chamber is further formed between the top of the fixing assembly and the outer sleeve, the top of the connecting channel is communicated with the chamber, a pressure increasing assembly is connected on the side wall of the outer sleeve, and the pressure increasing assembly is connected with the chamber for changing the pressure in the chamber.

[0018] Compared with the prior art, the present application has the following advantages and positive effects:

[0019] The dial knob clamp disclosed by the present application comprises a fixing assembly and a needle adjusting assembly, the needle adjusting assembly comprises movable needle adjusting members arranged on the fixing assembly and movable relative to the fixing assembly, in use, one side of the working end of the movable needle adjusting members is in contact with the dial knob of the multimeter, because the convex part of the dial knob is at a certain height from the surface of the multimeter, the movable needle adjusting members in contact with the dial knob retract, and the remaining movable needle adjusting members are arranged around the periphery of the dial knob, the adaptability is high, the movable needle adjusting members at corresponding positions retract to form recesses for different shapes and sizes of dial knobs, the versatility is high, the overall structure is simple, the manufacturing cost is low, and the maintenance is convenient.

[0020] Other features and advantages of the present application will become more apparent after reading the specific embodiments of the present application in combination with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 is an appearance view of one embodiment of the dial knob clamp disclosed by the present application;

[0023] Figure 2 is a sectional view of the dial knob clamp;

[0024] Figure 3 is an exploded view of the dial knob clamp;

[0025] Figure 4 is one of working schematic views of the dial knob;

[0026] Figure 5 This is the second schematic diagram of the dial knob's operation;

[0027] Figure 6 This is a structural diagram of the fixed component and the adjusting component;

[0028] Figure 7 yes Figure 6 Sectional view;

[0029] Figure 8 This is the structural diagram of the first fastener;

[0030] Figure 9 This is a structural diagram of another embodiment of the needle adjustment component;

[0031] Figure 10 yes Figure 9 A cross-sectional view of the structure;

[0032] Figure 11 This is a cross-sectional view of another embodiment of the dial knob clamp;

[0033] In the picture,

[0034] 100. Outer sleeve; 101. Chamber; 110. Limiting part; 120. Positioning protrusion;

[0035] 200. Fixing component; 210. First fixing member; 211. First hole segment; 212. First positioning section; 213. Second hole segment; 220. Second fixing member; 221. Second channel; 222. Second positioning section; 230. Third fixing member; 231. Third channel; 232. Third positioning section; 233. Support outer edge; 234. Extension;

[0036] 300. Adjusting needle assembly; 310. Connecting cylinder; 311. Support boss; 312. Inner retaining ring; 320. Reset part; 330. Movable adjusting needle assembly; 331. Working end; 332. Stop part;

[0037] 400. Dial knob;

[0038] 500. Boosting components. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] The terms "first", "second", are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the term "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0044] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can refer to the same reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0045] Reference Figures 1-3This application proposes a dial knob clamp, which includes a fixing component 200 and a needle adjustment component. The fixing component 200 serves as a connection base and is also used to connect to the output end of a drive motor.

[0046] After the dial knob clamp holds the dial knob 400, the drive motor drives the fixing component 200 to rotate at an angle, thereby detecting or calibrating the dial knob 400.

[0047] Specifically, the needle adjusting assembly includes a plurality of needle adjusting components 300 distributed on the fixed component 200. The needle adjusting components 300 are arranged in parallel with each other. Each needle adjusting component 300 includes a movable adjusting needle 330 that can move relative to the fixed component 200. A working end 331 is formed on the movable adjusting needle 330. The working end 331 can move in a direction that is close to or away from the fixed component 200.

[0048] The working end 331 of the movable adjusting needle 330 has a tapered tip. In the working state, each movable adjusting needle 330 is arranged vertically. For ease of processing and operation, the fixed component 200 includes two horizontal end faces, upper and lower. The axis of each movable adjusting needle 330 is set perpendicular to the horizontal end face of the fixed component 200. When working, the working end 331 of the movable adjusting needle 330 faces downward and contacts the dial knob 400.

[0049] Combination Figure 4 , Figure 5 The arrangement of each adjusting needle component 300 on the fixing component 200 can be in various ways, such as in an array or other symmetrical or asymmetrical arrangements. Preferably, the adjusting needle components 300 are arranged symmetrically on the fixing component 200. In this case, when they actually come into contact with the dial knob 400, the adjusting needle components 300 distributed on both sides of the dial knob 400 that apply force to the rotation of the dial knob 400 are also symmetrically designed. This helps to increase the number of adjusting needle components 300 that participate in applying force, thereby reducing the force on a single adjusting needle component 300 and preventing deformation of the adjusting needle component 300.

[0050] The dial knob fixture involved in this application has low maintenance costs. When a needle adjustment component 300 is deformed, it is only necessary to replace the corresponding deformed needle adjustment component 300.

[0051] Specifically, the universal meter is placed on the operation table, the dial knob clamp moves downward from directly above the universal meter, gradually contacts the universal meter, the working end 331 of the movable adjusting needle 330 gradually approaches the dial knob 400 on the universal meter, since the dial knob 400 protrudes from the surface of the universal meter by a certain height, the working end 331 of each movable adjusting needle 330 in contact with the dial knob 400 retracts upward along the direction close to the fixed assembly 200, and the remaining movable adjusting needles 330 are arranged around the periphery of the dial knob 400. After the dial knob clamp is lowered into place, the driving motor drives the dial knob clamp to rotate, the movable adjusting needles 330 arranged around the periphery of the dial knob 400 drive the dial knob 400 to rotate, and detection or calibration is performed.

[0052] The specific lowering height of the dial knob clamp is achieved through automatic control. Specifically, the dial knob clamp is connected to the lifting cylinder, and automatic lifting is achieved through the lifting cylinder or other lifting driving structures.

[0053] Since each movable adjusting needle 330 is movable, no collision occurs between the movable adjusting needle 330 and the universal meter, and damage to the surface of the universal meter during the lowering process of the dial knob clamp can also be avoided, which is safer.

[0054] In addition, for dial knobs 400 of different shapes and sizes, the movable adjusting needles 330 at corresponding positions on the dial knob clamp retract to form recesses on the lower side of the dial knob clamp, which is highly flexible and can adapt to dial knobs of various shapes. It has strong versatility, simple overall structure, low manufacturing cost, and is convenient to maintain.

[0055] In other embodiments, the adjusting needle piece 300 includes a connecting cylinder 310 and a reset portion 320. The connecting cylinder 310 is fixed to the fixed assembly 200, and a connecting passage is formed through the connecting cylinder 310. The adjusting needle piece 300 is movably connected in the connecting passage through the reset portion 320.

[0056] The reset portion 320 is specifically a reset spring. The reset spring is connected between the connecting cylinder 310 and the movable adjusting needle 330. When the working end 331 of the movable adjusting needle 330 contacts the dial knob 400, the reset portion 320 is compressed. When the adjustment is completed and the dial knob clamp is lifted, the reset spring resets, and the corresponding movable adjusting needle 330 also resets.

[0057] Reference Figure 9 、 Figure 10 In some embodiments of the present application, the adjusting needle piece 300 includes two components, a connecting cylinder 310 and a movable adjusting needle 330. The connecting cylinder 310 is fixed to the fixed assembly 200. Specifically, a plurality of mounting holes are provided through the fixed assembly 200 in the vertical direction, and the connecting cylinder 310 is fixed in the mounting holes.

[0058] The connecting cylinder 310 is formed with a connecting channel penetrating therethrough, and the movable adjusting needle 330 is movably connected in the connecting channel. In order to limit the downward movement of the movable adjusting needle 330 and avoid the movable adjusting needle 330 from being pulled out of the connecting channel, the bottom of the connecting channel is formed with an inner retaining ring 312, and the end of the movable adjusting needle 330 away from the working end 331 is formed with a stop portion 332, the size of which is greater than the inner diameter of the inner retaining ring 312.

[0059] The movable adjusting needle 330 in the embodiment is reset downward by gravity. When the working end 331 of the movable adjusting needle 330 is in contact with the dial knob 400, the movable adjusting needle 330 at the corresponding position is lifted upward, and the rest of the movable adjusting needles 330 are distributed on the side of the dial knob 400. When the adjustment is completed and the dial knob clamp is lifted, the movable adjusting needles 330 above the dial knob 400 are reset under the action of gravity.

[0060] Reference Figure 2 In some other embodiments of the present application, the dial knob clamp further comprises an outer sleeve 100, which is a cylindrical structure as a whole and is formed with a penetrating mounting inner cavity in the inside thereof, and the fixing assembly 200 is connected in the mounting inner cavity.

[0061] The end of the outer sleeve 100 close to the working end 331 is formed with a limiting portion 110 extending into the mounting inner cavity, and the fixing assembly 200 is connected on the limiting portion 110.

[0062] In some embodiments of the present application, the fixing assembly 200 comprises a first fixing member 210 and a second fixing member 220, which are spaced apart along the axis of the adjusting needle 300, and the first fixing member 210 is located above the second fixing member 220, and the two ends of the connecting cylinder 310 are fixed on the first fixing member 210 and the second fixing member 220 respectively.

[0063] In some other embodiments, in order to facilitate the installation of the connecting cylinder 310, a third fixing member 230 is further arranged in the outer sleeve 100, and the third fixing member 230 is arranged on the side of the second fixing member 220 away from the first fixing member 210, in other words, the third fixing member 230 is located at the bottom of the outer sleeve 100.

[0064] In combination Figure 2 , Figure 7 The bottom of the third fixing member 230 is formed with an extension portion 234, the size of which is matched with the inner diameter of the limiting portion 110 on the outer sleeve 100. During installation, the third fixing member 230 is installed downward from the top of the outer sleeve 100 until the extension portion 234 is inserted into the limiting portion 110, which is beneficial to improve the accuracy of connection.

[0065] The outer wall of the first fixing member 210, the second fixing member 220 and the third fixing member 230 is in interference connection with the outer sleeve 100, so as to realize the stability of the connection between the fixing assembly 200 and the outer sleeve 100, and avoid the movement of the fixing assembly 200 under the action of the movable adjusting needle 330.

[0066] Specifically, the third channel 231 is formed in the third fixing member 230, and the working end 331 of the movable adjusting needle 330 extends to the outside of the third fixing member 230 through the third channel 231. In the free state of the reset part 320, the distance L between the working end 331 and the third fixing member 230 is greater than the preset size.

[0067] The specific setting of the preset size is determined according to the actual measurement requirement. Preferably, the preset size should be greater than the height of the dial knob 400. In the adjustment, the contact length between the movable adjusting needle 330 on the side of the dial knob 400 and the dial knob 400 is increased, so as to avoid the deformation of the movable adjusting needle 330 under the force of the dial knob 400 in the adjustment.

[0068] In some other embodiments, the connecting barrel 310 is provided with a support boss 311 at one end close to the working end 331. The size of the support boss 311 is greater than the outer wall of the connecting barrel 310. The support boss 311 is arranged between the second fixing member 220 and the third fixing member 230. The second channel 221 is formed in the second fixing member 220 and is matched with the size of the outer wall of the connecting barrel 310. The connecting barrel 310 extends to the first fixing member 210 through the second channel 221.

[0069] Specifically, the third fixing member 230 is installed into the outer sleeve 100 first. Then, the working end 331 of each movable adjusting needle 330 of the adjusting needle assembly 300 is inserted into the third channel 231 of the third fixing member 230. The size of the support boss 311 is greater than the third channel 231, and the bottom of the support boss 311 is supported above the third fixing member 230. Then, the second fixing member 220 is installed into the outer sleeve 100. When the second fixing member 220 is installed, the second channel 221 on the second fixing member 220 is matched with the adjusting needle assembly 300 one by one. The connecting barrel 310 of the adjusting needle assembly 300 is inserted into the corresponding second channel 221. Finally, the first fixing member 210 is assembled.

[0070] In some other embodiments, in order to avoid that the gap between the second fixing member 220 and the third fixing member 230 is too small and the pressure on the support boss 311 is too large, an upwardly extending support outer edge 233 is formed on the side of the third fixing member 230. The height of the support outer edge 233 is matched with the height of the support boss 311. The bottom of the second fixing member 220 is supported on the support outer edge 233, so as to ensure the gap between the second fixing member 220 and the third fixing member 230.

[0071] Reference Figure 8 In some other embodiments, the first fixing member 210 is formed with a stepped hole, which comprises a first hole section 211 and a second hole section 213 arranged in sequence along a direction close to the second fixing member 220, i.e. the first hole section 211 is located above the second hole section 213.

[0072] The size of the second hole section 213 is adapted to the size of the outer wall of the connecting cylinder 310, for fixing with the upper end of the connecting cylinder 310, and the size of the first hole section 211 is greater than the size of the outer wall of the movable tuning pin 330 and less than the size of the outer wall of the connecting cylinder 310, for the upper end of the movable tuning pin 330 to pass through.

[0073] When the first fixing member 210 is installed, the second hole section 213 corresponds to each connecting cylinder 310 one by one, and the other end of the movable tuning pin 330 extends to the other side of the first fixing member 210 through the corresponding second hole section 213.

[0074] Of course, the tuning pin member 300 and the fixing assembly 200 can also be assembled together and then installed into the outer sleeve 100.

[0075] Specifically, the installation inner cavity is cylindrical, in order to improve the accuracy of the combination of the first fixing member 210, the second fixing member 220 and the third fixing member 230 during assembly, Figure 3 、 Figure 6 In order to improve the accuracy of the combination of the first fixing member 210, the second fixing member 220 and the third fixing member 230 during assembly, the inner wall of the outer sleeve 100 is formed with a positioning convex part 120, the positioning convex part 120 is formed with a matching surface, the outer periphery shape of the first fixing member 210, the second fixing member 220 and the third fixing member 230 is adapted to the installation inner cavity, and the first fixing member 210, the second fixing member 220 and the third fixing member 230 are respectively formed with a first positioning section 212, a second positioning section 222 and a third positioning section 232 adapted to the matching surface on the positioning convex part 120, so that the corresponding stepped hole, the second channel 221 and the third channel 231 are coaxially arranged.

[0076] Reference Figure 11 In some other embodiments, in addition to the reset by the reset part 320 and the self-gravity of the movable tuning pin 330, the reset of the movable tuning pin 330 can also be achieved by means of air pressure driving.

[0077] Specifically, the top of the outer sleeve 100 is provided with a cover, and after the fixing assembly 200 and the tuning pin member 300 are installed, the cover is arranged on the top of the outer sleeve 100, and a closed chamber 101 is further formed between the top of the fixing assembly 200 and the outer sleeve 100.

[0078] The top of the connecting channel on the connecting cylinder 310 is in communication with the chamber 101, that is, the top of the movable adjusting needle 330 is in contact with the gas in the chamber 101, the side wall of the outer sleeve 100 is connected with a pressurizing assembly 500, the pressurizing assembly 500 is connected with the chamber 101, and is used for changing the pressure in the chamber 101.

[0079] When the working end 331 of the movable adjusting needle 330 is in contact with the dial knob 400, the movable adjusting needle 330 at the corresponding position is pushed upward, and the other movable adjusting needles 330 are distributed on the circumferential side of the dial knob 400, when the adjustment is completed, the pressurizing assembly 500 fills the chamber 101 with gas, so that the pressure in the chamber 101 is increased, and the movable adjusting needles 330 pushed upward can be reset.

[0080] The pressurizing assembly 500 comprises a pressurizing pump, a gas pressure pump and the like structure, and is connected with the outer wall of the outer sleeve 100 through a gas supply pipeline.

[0081] As far as possible, various aspects and features described and shown in the specification can be applied independently, and these independent aspects can be taken as the subject matter of a divisional application.

[0082] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0083] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application, therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A dial knob clamp, characterized in that, include: Fixed components; The needle adjusting assembly includes a plurality of needle adjusting members disposed separately on the fixed assembly, the needle adjusting members being arranged in parallel with each other, each needle adjusting member including a movable adjusting needle that can move relative to the fixed assembly; the movable adjusting needle has a working end formed thereon, the working end being movable in a direction toward or away from the fixed assembly.

2. The dial knob clamp according to claim 1, characterized in that, It also includes an outer sleeve with an inner mounting cavity formed therein, the fixing component being connected to the inner mounting cavity, and a limiting portion extending into the inner mounting cavity being formed at one end of the outer sleeve near the working end, the fixing component being connected to the limiting portion.

3. The dial knob clamp according to claim 2, characterized in that, The needle adjusting component includes a connecting cylinder and a reset part. A through connecting channel is formed inside the connecting cylinder. The needle adjusting component is movably connected to the connecting channel through the reset part. The connecting cylinder is fixed to the fixing assembly.

4. The dial knob clamp according to claim 3, characterized in that, The fixing component includes a first fixing member and a second fixing member, which are spaced apart along the axis of the adjusting needle member, and the two ends of the connecting cylinder are respectively fixed to the first fixing member and the second fixing member.

5. The dial knob clamp according to claim 4, characterized in that, It also includes a third fixing member, which is disposed on the side of the second fixing member away from the first fixing member. A through third channel is formed on the third fixing member, and the working end of the movable adjusting pin extends to the outside of the third fixing member through the third channel. In the free state of the reset part, the distance L between the working end and the third fixing member is greater than a preset size.

6. The dial knob clamp according to claim 5, characterized in that, A support boss is formed at one end of the connecting cylinder near the working end. The size of the support boss is larger than the outer wall of the connecting cylinder. The support boss is disposed between the second fixing member and the third fixing member. A second channel adapted to the size of the outer wall of the connecting cylinder is formed on the second fixing member. The connecting cylinder extends through the second channel toward the first fixing member.

7. The dial knob clamp according to claim 6, characterized in that, The first fixing member has a stepped hole, including a first hole segment and a second hole segment arranged sequentially along the direction close to the second fixing member. The size of the first hole segment is adapted to the outer wall size of the connecting cylinder. The size of the second hole segment is larger than the outer wall size of the movable adjusting pin and smaller than the outer wall size of the connecting cylinder. The other end of the movable adjusting pin extends to the other side of the first fixing member through the corresponding second hole segment.

8. The dial knob clamp according to claim 7, characterized in that, The mounting cavity is cylindrical, and a positioning protrusion is formed on its inner wall. The outer periphery of the first fixing member, the second fixing member, and the third fixing member is adapted to the mounting cavity. The first fixing member, the second fixing member, and the third fixing member are respectively formed with a first positioning surface, a second positioning surface, and a third positioning surface adapted to the positioning protrusion, so that the corresponding stepped hole, the second channel, and the third channel are coaxially arranged.

9. The dial knob clamp according to claim 2, characterized in that, The adjusting needle component also includes a connecting cylinder, which is fixed to the fixing assembly. A through connecting channel is formed inside the connecting cylinder, and the movable adjusting needle is movably connected to the connecting channel. An inner retaining ring is formed at the bottom of the connecting channel, and a stop portion is formed at the end of the movable adjusting needle away from the working end. The size of the stop portion is larger than the inner diameter of the inner retaining ring.

10. The dial knob clamp according to claim 9, characterized in that, A closed chamber is formed between the top of the fixing component and the outer sleeve. The top of the connecting channel communicates with the chamber. A pressurizing component is connected to the side wall of the outer sleeve and is connected to the chamber to change the pressure inside the chamber.

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