Instrument

Abstract

The instrument comprises an instrument display shell, an instrument measuring shaft, a rotating piece and a positioning piece, the rotating piece is arranged on the instrument measuring shaft and can rotate in the circumferential direction relative to the instrument measuring shaft, the instrument display shell is fixedly connected with the rotating piece, and a positioning through hole is formed in the circumferential side face of the rotating piece. At least two positioning matching groove holes matched with the positioning through holes are formed in the peripheral side surface of the instrument measuring shaft; when the positioning piece is fastened in the positioning through hole and the positioning matching groove hole, the rotating piece and the instrument measuring shaft are in a relatively fixed state so as to limit circumferential rotation of the rotating piece relative to the instrument measuring shaft. In actual use, the instrument display shell can be rotated in the circumferential direction to adjust the angle by loosening the fastened positioning piece, so that the problem that the visual installation direction of the instrument display shell is limited by the installation direction of the measuring shaft is solved, the operation is simple and convenient, and a user does not need to disassemble other parts of a product and does not need to operate by professionals.

Description

Technical Field

[0001] This utility model relates to the field of measurement technology, and in particular to an instrument. Background Technology

[0002] The existing instrument design restricts the visible installation direction of the instrument display housing during on-site installation by the installation direction of the measuring axis. This makes it difficult to read information in confined spaces. When the display housing needs to be rotated, it often needs to be disassembled and reinstalled. For non-professionals, this type of installation can easily lead to problems and affect product performance and safety. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an instrument that solves the problem that the visible installation direction of the instrument display housing is limited by the installation direction of the measuring shaft.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides an instrument, including an instrument display housing, an instrument measuring shaft, a rotating component, and a positioning component. The rotating component is disposed on the instrument measuring shaft and is capable of circumferential rotation relative to the instrument measuring shaft. The instrument display housing is fixedly connected to the rotating component. A positioning through hole is provided on the circumferential side of the rotating component, and at least two positioning matching slots are provided on the circumferential side of the instrument measuring shaft to mate with the positioning through hole. When the positioning component is fastened in the positioning through hole and the positioning matching slots, the rotating component and the instrument measuring shaft are in a relatively fixed state, thereby restricting the circumferential rotation of the rotating component relative to the instrument measuring shaft.

[0006] Furthermore, the rotating component includes an inner rotating block and an outer rotating block. The inner rotating block is sleeved on the instrument measuring shaft, and the outer rotating block is fixedly connected to the inner rotating block, with the inner rotating block located inside the outer rotating block.

[0007] Furthermore, the instrument measuring shaft is provided with an annular groove, the inner rotating block is provided with a limiting hole at its center, and the sidewall of the limiting hole extends towards its center with a stepped portion, which is engaged in the annular groove.

[0008] Furthermore, the inner rotating block includes a first C-shaped assembly block and a second C-shaped assembly block. After the first C-shaped assembly block and the second C-shaped assembly block are fixedly connected, they form a limiting hole.

[0009] Furthermore, the outer rotating block is provided with a receiving groove with a bottom opening, and the inner rotating block is located in the receiving groove.

[0010] Furthermore, the top of the receiving groove is provided with a through hole that is adapted to the shape of the top area of ​​the instrument measuring shaft, and the top area of ​​the instrument measuring shaft passes through the receiving groove and enters the through hole.

[0011] Furthermore, a first sealing ring is provided between the outer rotating block and the top area of ​​the instrument measuring shaft.

[0012] Furthermore, a second sealing ring is provided between the bottom of the instrument display housing and the top area of ​​the instrument measuring shaft.

[0013] Furthermore, a rotation limiting structure is provided between the rotating component and the instrument measuring shaft.

[0014] Furthermore, the rotation limiting structure includes a limiting groove and a limiting slider. The limiting groove is located in the top region of the instrument measuring shaft, and the limiting slider is located on the outer rotating block and placed in the limiting groove. When the limiting slider rotates along the limiting groove to its end position, the limiting slider abuts against the end position of the limiting groove to limit the rotating component from continuing to rotate relative to the instrument measuring shaft.

[0015] The advantages of this invention compared to existing technologies are as follows: An instrument includes an instrument display housing, an instrument measuring shaft, a rotating component, and a positioning component. The rotating component is mounted on the instrument measuring shaft and can rotate circumferentially relative to the measuring shaft. The instrument display housing is fixedly connected to the rotating component. A positioning through hole is provided on the circumferential side of the rotating component, and at least two positioning matching slots are provided on the circumferential side of the instrument measuring shaft. When the positioning component is fastened in the positioning through hole and the positioning matching slot, the rotating component and the instrument measuring shaft are in a relatively fixed state, thereby restricting the circumferential rotation of the rotating component relative to the instrument measuring shaft. In actual use, by loosening the fastened positioning component, the instrument display housing can be rotated circumferentially to adjust the angle. After adjusting the angle, the positioning component is fastened again, thus solving the problem that the visible installation direction of the instrument display housing is limited by the installation direction of the measuring shaft. The operation is simple and convenient, and users do not need to disassemble other parts of the product or require professional personnel to operate it.

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of an instrument provided for a specific embodiment of this utility model;

[0019] Figure 2 A partial structural diagram of an instrument provided for a specific embodiment of this utility model. Figure 1 ;

[0020] Figure 3 A partial structural diagram of an instrument provided for a specific embodiment of this utility model. Figure 2 ;

[0021] Figure 4 An exploded view of a portion of the structure of an instrument provided in a specific embodiment of this utility model;

[0022] Figure 5 A schematic diagram of the structure of an outer rotating block in an instrument is provided for a specific embodiment of this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of an instrument measuring shaft in a specific embodiment of the present invention.

[0024] Figure Labels

[0025] 1. Instrument display housing; 2. Instrument measuring shaft; 21. Annular groove; 22. Positioning and fitting groove; 23. Limiting groove; 231. End of the limiting groove; 3. Rotating component; 31. Inner rotating block; 311. First C-type combination block; 312. Second C-type combination block; 313. Limiting hole; 32. Outer rotating block; 321. Receiving groove; 322. Through hole; 3221. Limiting slider; 33. Positioning through hole; 4. Positioning component; 5. First sealing ring; 6. Second sealing ring. Detailed Implementation

[0026] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] like Figures 1 to 6 As shown, this utility model embodiment provides an instrument, including an instrument display housing 1, an instrument measuring shaft 2, a rotating component 3, and a positioning component 4. The rotating component 3 is disposed on the instrument measuring shaft 2 and can rotate circumferentially relative to the instrument measuring shaft 2. The instrument display housing 1 is fixedly connected to the rotating component 3, so that the instrument display housing 1 and the rotating component 3 can rotate circumferentially synchronously. A positioning through hole 33 is provided on the circumferential side of the rotating component 3, and at least two positioning matching slots 22 are provided on the circumferential side of the instrument measuring shaft 2, which cooperate with the positioning through hole 33. When the positioning component 4 is fastened in the positioning through hole 33 and the positioning matching slots 22, the rotating component 3 and the instrument measuring shaft 2 are in a relatively fixed state, thereby restricting the circumferential rotation of the rotating component 3 relative to the instrument measuring shaft 2.

[0033] In actual use, by loosening the fastening positioning piece 4, the instrument display housing 1 can be rotated circumferentially to adjust the angle. After adjusting the angle, the positioning piece 4 is tightened again, thus solving the problem that the visible installation direction of the instrument display housing 1 is limited by the installation direction of the measuring axis. The operation is simple and convenient, and users do not need to disassemble other parts of the product or perform the operation without professional personnel.

[0034] It should be noted that in order to achieve positioning at multiple angles, the number of positioning mating slots 22 is at least two, and can be two, three, four or more. By using the positioning mating slots 22 in different positions to cooperate with the positioning through holes 33, positioning at multiple angles can be achieved to meet the positioning requirements after the instrument display housing 1 is angled.

[0035] It should also be noted that in some cases, the design of the instrument display housing 1 may interfere with the tightening or loosening of the positioning member 4. In this case, a window or opening may be made in the instrument display housing 1 corresponding to the position of the positioning member 4. When in use, the positioning member 4 can be operated using the window or opening.

[0036] The positioning element 4 can be a bolt or a pin, etc. In this embodiment, the positioning element 4 is a bolt. The hole wall of the positioning through hole 33 is threaded. By inserting the bolt into the positioning mating slot 22 and the positioning through hole 33 and tightening it, the positioning between the rotating part 3 and the instrument measuring shaft 2 is achieved, so as to prevent the rotating part 3 from rotating circumferentially relative to the instrument measuring shaft 2. When it is necessary to release the positioning state, the bolt can be loosened and removed from the positioning mating slot 22 and the positioning through hole 33. At this time, the rotating part 3 can be rotated circumferentially.

[0037] In one embodiment, such as Figure 3 , Figure 4 As shown, the rotating component 3 includes an inner rotating block 31 and an outer rotating block 32. The inner rotating block 31 is sleeved on the instrument measuring shaft 2, and the outer rotating block 32 is fixedly connected to the inner rotating block 31, with the inner rotating block 31 located inside the outer rotating block 32.

[0038] Specifically, the inner rotating block 31 is tightly fitted onto the instrument measuring shaft 2. This fitting method ensures the relative position stability between the inner rotating block 31 and the instrument measuring shaft 2, while allowing the inner rotating block 31 to rotate circumferentially relative to the instrument measuring shaft 2. The outer rotating block 32 is fastened to the inner rotating block 31 using bolts, nuts, or other connecting parts. The inner rotating block 31 is placed within the internal space of the outer rotating block 32, and together they constitute the complete rotating component 3 structure.

[0039] The inner rotating block 31, by directly engaging with the instrument measuring shaft 2, ensures smooth and accurate rotation; the outer rotating block 32 provides stronger structural strength and stability, better supporting the instrument display housing 1 to which it is fixedly connected. Furthermore, the rotating component 3 is designed as a modular structure, making manufacturing and installation more convenient. When a component needs to be replaced, the entire rotating component 3 does not need to be replaced, reducing maintenance costs.

[0040] It should be noted that the fixed connection between the inner rotating block 31 and the outer rotating block 32 can be achieved by a snap-fit ​​connection. Several elastic snaps are provided on the outer surface of the inner rotating block 31, and corresponding slots are provided on the inner surface of the outer rotating block 32. During installation, the inner rotating block 31 is inserted into the outer rotating block 32, and the snaps snap into the slots to achieve a quick connection. This method is more convenient for assembly and disassembly, and improves production efficiency.

[0041] In one embodiment, such as Figure 4 , Figure 6 As shown, the instrument measuring shaft 2 is provided with an annular groove 21, and the inner rotating block 31 is provided with a limiting hole 313 at its center. The side wall of the limiting hole 313 extends towards its center and is provided with a stepped part, which is engaged in the annular groove 21.

[0042] Specifically, the annular groove 21 on the instrument measuring shaft 2 is a groove structure that surrounds the shaft. The limiting hole 313 at the center of the inner rotating block 31 provides space for the inner rotating block 31 to be fitted onto the instrument measuring shaft 2, and the stepped portion extending from the side wall of the limiting hole 313 towards the center has a size and shape that perfectly matches the annular groove 21. When the inner rotating block 31 is fitted onto the instrument measuring shaft 2, the stepped portion can be precisely engaged in the annular groove 21, thereby restricting the axial movement of the inner rotating block 31 on the instrument measuring shaft 2 without affecting its circumferential rotation.

[0043] The engagement of the stepped portion with the annular groove 21 ensures reliable axial positioning of the inner rotating block 31 on the instrument's measuring shaft 2, preventing axial movement of the inner rotating block 31 from affecting the instrument's measurement accuracy and stability during operation. Secondly, this engagement method does not affect the circumferential rotation of the inner rotating block 31, ensuring the normal functioning of the rotating component 3 as a whole. Furthermore, compared to other complex axial limiting structures, this design is simple, reliable, easy to manufacture, and reduces production costs.

[0044] In one embodiment, such as Figure 4 As shown, the inner rotating block 31 includes a first C-shaped assembly block 311 and a second C-shaped assembly block 312. After the first C-shaped assembly block 311 and the second C-shaped assembly block 312 are fixedly connected, they form a limiting hole 313.

[0045] The first C-shaped assembly block 311 and the second C-shaped assembly block 312 are both C-shaped. When they are fixedly connected together, their openings face each other, forming a complete limiting hole 313, which is used to fit the instrument measuring shaft 2. To achieve a stable connection, multiple corresponding threaded holes can be provided on the mating edges of the two C-shaped assembly blocks for fastening with bolts and nuts. Alternatively, matching tenon and mortise structures can be provided on the mating surfaces of the two C-shaped assembly blocks. The tenon protrudes from the mating surface of the first C-shaped assembly block 311, and a mortise is correspondingly provided on the mating surface of the second C-shaped assembly block 312. During assembly, the tenon is inserted into the mortise, and then glue is used for further fixation to ensure a firm connection.

[0046] Disassembling the inner rotating block 31 into two C-shaped assembly blocks significantly reduces manufacturing complexity. Compared to manufacturing a single, integrated inner rotating block 31, the mold design and manufacturing of the C-shaped assembly blocks are simpler, less costly, and more efficient. Furthermore, the C-shaped assembly blocks facilitate easy installation and disassembly during assembly. If the inner rotating block 31 is damaged and needs replacement, only the two C-shaped assembly blocks need to be disassembled, eliminating the need to replace the entire inner rotating block 31, thus reducing maintenance costs and complexity.

[0047] In one embodiment, such as Figure 5As shown, the outer rotating block 32 is provided with a receiving groove 321 with a bottom opening, and the inner rotating block 31 is located in the receiving groove 321.

[0048] Specifically, the shape and size of the receiving groove 321 are precisely adapted to the inner rotating block 31 to ensure that the inner rotating block 31 can be stably placed therein. The bottom opening of the receiving groove 321 allows the inner rotating block 31 to be easily inserted from the bottom. During installation, simply align the inner rotating block 31 with the opening of the receiving groove 321 and push it axially until the inner rotating block 31 is completely placed in the appropriate position within the receiving groove 321.

[0049] To further ensure the stability of the inner rotating block 31 within the receiving groove 321, positioning structures can be provided between the inner wall of the receiving groove 321 and the outer wall of the inner rotating block 31. For example, several raised positioning ribs can be provided on the inner wall of the receiving groove 321, and corresponding positioning grooves can be provided on the outer wall of the inner rotating block 31. When the inner rotating block 31 is inserted into the receiving groove 321, the positioning ribs engage with the positioning grooves, thereby restricting the radial movement of the inner rotating block 31 within the receiving groove 321. Alternatively, rubber buffer pads can be provided on the mating surfaces of the two components, which can both provide some shock absorption and increase friction, preventing the inner rotating block 31 from accidentally shaking within the receiving groove 321.

[0050] The bottom-opening receiving groove 321 design greatly simplifies the installation process of the inner rotating block 31, reduces assembly difficulty, and improves production efficiency.

[0051] In one embodiment, the top of the receiving groove 321 has a through hole 322 that conforms to the shape of the top area of ​​the instrument measuring shaft 2. The top area of ​​the instrument measuring shaft 2 passes through the receiving groove 321 and enters the through hole 322. This design provides accurate guidance for the installation of the instrument measuring shaft 2 through the through hole 322, greatly improving the accuracy and efficiency of assembly and reducing assembly difficulty and cost. Figure 3 As shown, Figure 3 This is the state in which the instrument measuring shaft 2 is fully completed. In this state, the top area of ​​the instrument measuring shaft 2 is in the through hole 322, and the top surface of the instrument measuring shaft 2 is flush with the top surface of the outer rotating block 32.

[0052] In one embodiment, such as Figure 4 As shown, a first sealing ring 5 is provided between the outer rotating block 32 and the top area of ​​the instrument measuring shaft 2, and a second sealing ring 6 is provided between the bottom of the instrument display housing 1 and the top area of ​​the instrument measuring shaft 2. The first sealing ring 5 and the second sealing ring 6 are made of rubber.

[0053] The first sealing ring 5 is installed on the contact surface between the outer rotating block 32 and the top area of ​​the instrument measuring shaft 2. Its installation position is typically located at the edge of the through hole 322 at the top of the receiving groove 321 of the outer rotating block 32. When the top area of ​​the instrument measuring shaft 2 passes through the receiving groove 321 of the outer rotating block 32 and enters the through hole 322, the first sealing ring 5 is compressed between them. This compression allows the first sealing ring 5 to tightly adhere to the surfaces of the outer rotating block 32 and the instrument measuring shaft 2, forming an effective sealing barrier. Similarly, the second sealing ring 6 is installed at the contact position between the bottom of the instrument display housing 1 and the top area of ​​the instrument measuring shaft 2. Its installation method is similar to that of the first sealing ring 5; it is also compressed during assembly to achieve a seal.

[0054] The first sealing ring 5 and the second sealing ring 6 effectively improve the instrument's sealing performance, preventing dust, moisture, and other impurities from entering the instrument and avoiding corrosion and damage to the precision components inside, thereby greatly improving the instrument's reliability and service life. On the other hand, the elasticity of the sealing rings also plays a certain role in shock absorption and cushioning, reducing wear on components such as the measuring shaft, rotating parts 3, and instrument display housing 1 caused by vibrations during instrument operation, ensuring the instrument's measurement accuracy and stability.

[0055] In one embodiment, a rotation limiting structure is provided between the rotating component 3 and the instrument measuring shaft 2. Specifically, the rotation limiting structure includes a limiting groove 23 and a limiting slider 3221. The limiting groove 23 is located in the top region of the instrument measuring shaft 2, and the limiting slider 3221 is located on the outer rotating block 32, and the limiting slider 3221 is placed in the limiting groove 23. When the limiting slider 3221 rotates along the limiting groove 23 to its end position, the limiting slider 3221 abuts against the end 231 of the limiting groove to limit the rotating component 3 from continuing to rotate relative to the instrument measuring shaft 2.

[0056] In this embodiment, as Figure 3 , Figure 5 , Figure 6 As shown, the limiting slider 3221 is a protruding shape and is disposed on the wall of the through hole 322 of the outer rotating block 32. The limiting groove 23 is an arc-shaped groove along the circumference of the instrument measuring shaft 2, and its length and curvature are designed according to the actual required rotation angle range. As the rotating part 3 rotates circumferentially around the instrument measuring shaft 2, the limiting slider 3221 will move along the limiting groove 23. When the rotating part 3 rotates to the set limit angle, the limiting slider 3221 will reach the end 231 of the limiting groove. At this time, the limiting slider 3221 abuts against the end 231 of the limiting groove, thereby preventing the rotating part 3 from continuing to rotate and playing a limiting role.

[0057] The rotation limit structure provides a clear limit to the rotation angle of the rotating component 3, avoiding problems such as tangling of internal wiring and damage to components due to excessive rotation, thus greatly improving the reliability and stability of the instrument.

[0058] In one embodiment, the rotation limiting structure includes a limiting protrusion and a limiting slider. The limiting slider is protruding and disposed on the wall of the through hole of the outer rotating block. The limiting protrusion is disposed in a certain region of the top area of ​​the instrument measuring shaft in the axial direction. As the rotating component rotates circumferentially around the instrument measuring shaft, the limiting slider moves circumferentially along the top area of ​​the instrument measuring shaft. When the rotating component rotates to a set limit angle, the limiting slider abuts against the limiting protrusion, thereby preventing the rotating component from continuing to rotate and achieving a limiting function.

[0059] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An instrument, characterized in that, The device includes an instrument display housing, an instrument measuring shaft, a rotating component, and a positioning component. The rotating component is mounted on the instrument measuring shaft and is capable of circumferential rotation relative to the instrument measuring shaft. The instrument display housing is fixedly connected to the rotating component. A positioning through hole is provided on the circumferential side of the rotating component, and at least two positioning matching slots are provided on the circumferential side of the instrument measuring shaft to mate with the positioning through hole. When the positioning component is fastened in the positioning through hole and the positioning matching slots, the rotating component and the instrument measuring shaft are in a relatively fixed state to restrict the circumferential rotation of the rotating component relative to the instrument measuring shaft.

2. The instrument according to claim 1, characterized in that, The rotating component includes an inner rotating block and an outer rotating block. The inner rotating block is sleeved on the instrument measuring shaft, and the outer rotating block is fixedly connected to the inner rotating block, with the inner rotating block located inside the outer rotating block.

3. The instrument according to claim 2, characterized in that, The measuring shaft of the instrument is provided with an annular groove, the center of the inner rotating block is provided with a limiting hole, and the side wall of the limiting hole extends towards its center with a stepped part, which is engaged in the annular groove.

4. The instrument according to claim 3, characterized in that, The inner rotating block includes a first C-shaped combination block and a second C-shaped combination block. After the first C-shaped combination block and the second C-shaped combination block are fixedly connected, they form a limiting hole.

5. An instrument according to claim 2, characterized in that, The outer rotating block has a receiving groove with a bottom opening, and the inner rotating block is located in the receiving groove.

6. An instrument according to claim 5, characterized in that, The top of the receiving groove is provided with a through hole that is adapted to the shape of the top area of ​​the instrument measuring shaft, and the top area of ​​the instrument measuring shaft passes through the receiving groove and enters the through hole.

7. An instrument according to claim 2, characterized in that, A first sealing ring is provided between the outer rotating block and the top area of ​​the instrument measuring shaft.

8. An instrument according to claim 2, characterized in that, A second sealing ring is provided between the bottom of the instrument display housing and the top area of ​​the instrument measuring shaft.

9. An instrument according to any one of claims 2-8, characterized in that, A rotation limiting structure is provided between the rotating component and the instrument measuring axis.

10. An instrument according to claim 9, characterized in that, The rotation limiting structure includes a limiting groove and a limiting slider. The limiting groove is located in the top region of the instrument measuring shaft, and the limiting slider is located on the outer rotating block and placed in the limiting groove. When the limiting slider rotates along the limiting groove to its end position, the limiting slider abuts against the end position of the limiting groove to limit the rotating part from continuing to rotate relative to the instrument measuring shaft.

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