Installation structure of instrument scale plate

Abstract

The utility model discloses a mounting structure of an instrument scale plate, which comprises a lamp box component, a pointer slotted hole in the middle of the lamp box component, a pointer mounting hole in the middle of the pointer slotted hole, a rotating shaft for driving a pointer in the pointer mounting hole, and a mounting sleeve at the bottom of the pointer inserted into the top of the rotating shaft. The inner wall of the pointer installation hole extends upwards to form an integrally-formed protruding ring, the two sides of the protruding ring are provided with outwards-protruding check blocks, the outer wall of the pointer installation hole is provided with a supporting block, the supporting block is located below the check blocks, the position, opposite to the check blocks, of the supporting block is provided with through holes correspondingly consistent with the check blocks, the scale plate is arranged on the upper surface of the lamp box component, and an insertion hole is formed in the middle of the scale plate. The size of the inserting hole is between the size of the convex ring and the size of the pointer groove hole, the inserting hole is arranged outside the convex ring in a sleeved mode and can move relative to the convex ring, limiting parts are arranged on the two sides of the inserting hole, and the limiting parts are embedded between the check block and the supporting block after the scale plate moves to the installation position. According to the utility model, assembly parts and installation steps required when the scale plate is installed can be reduced, and the assembly speed is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of instrument assembly, in particular to a mounting structure for an instrument scale plate. Background Art

[0002] A variety of instrument panels are typically installed in a car's cockpit, displaying information such as speed, mileage, RPM, pressure, and fuel level, allowing the driver to understand the vehicle's operating status. Existing instrument panels typically consist of a base, a PCB (printed circuit board), a light box, a scale plate, and an instrument cover, assembled from bottom to top. The scale plate is marked with scale information and equipped with a pointer to indicate the scale position. The light box has a built-in display light source that illuminates the scale plate above. An internal motor drives the pointer, which rotates or moves according to the vehicle's operating status during operation. The driver can determine the instrument reading based on the scale position indicated by the pointer and understand the vehicle's condition accordingly.

[0003] In order to make the scale plate in the above structure be stably mounted on the light box component, there are currently Figure 1 The mounting structure shown in the figure has a pressure ring mounting hole 92 on the scale plate 2 aligned with the corresponding pointer mounting hole 3 on the lower light box component 1, and is further provided with a pressure ring 9 adapted to each hole, the lower end of the pressure ring 9 forming a buckle 91, which passes downward through the pressure ring mounting hole 92 and the pointer mounting hole 3 in sequence and is snapped into the light box component 1, and the annular structure at the upper end of the pressure ring 9 presses down on the scale plate 2, so that the scale plate can be fixed to the corresponding position in the instrument panel by the upper and lower clamping action. However, currently, automobiles are generally equipped with a large number of instrument panels. When adopting the above-mentioned mounting structure, it is necessary to prepare corresponding pressure ring components for holes of different specifications to fix the scale plates, resulting in a large number of components to be assembled, which increases the number of installation steps. The installation or removal process of each pressure ring component takes a certain amount of time, and the operation is relatively cumbersome and inconvenient, which affects the speed at which workers assemble the entire instrument panel. Utility Model Content

[0004] The utility model aims to provide an installation structure for an instrument scale plate, which can reduce the assembly parts and installation steps required when installing the scale plate and improve the assembly speed.

[0005] The utility model discloses an installation structure of instrument scale board, including light box component, scale board, pointer, the middle part of light box component has the pointer slot hole, and the middle part of pointer slot hole sets up the pointer installation hole, and there is the pivot of driving pointer in the pointer installation hole, and the pivot top inserts the installation sleeve in the bottom of pointer, the inner wall of pointer installation hole extends the integral mould convex ring upwards, and the convex ring both sides set up the outward bulging stopper, and the outer wall of pointer installation hole sets up the supporting block, and the supporting block is located below the stopper, and the position opposite the supporting block of supporting block sets up the through -hole consistent with the stopper, scale board is placed in the upper surface of light box component, and the middle part sets up the insertion hole, and the size of insertion hole is between the convex ring and pointer slot hole, and its sleeve is at the outside of convex ring and can move to the convex ring, and the both sides of insertion hole set up the limiting portion, and the limiting portion is embedded between the stopper and supporting block after scale board moves to the installation position.

[0006] The utility model discloses an installation structure of instrument scale board, because its stopper is outward bulging to the convex ring, and its below has the outward bulging supporting block on the outer wall of pointer installation hole, and the stopper and supporting block form the upper and lower opposite structure, and the injection moulding process of light box component adopts the mould of upper and lower arrangement, for forming the integral mould structure above, through setting up the through -hole, makes the supporting block and stopper staggered with each other in the vertical direction, thereby when injection moulding, the upper mould is placed into the pointer slot hole from the top of light box component, and the lower mould corresponding thereto is placed into the pointer slot hole from the bottom of light box component, and the top rod of the through -hole position of the supporting block that can be adapted to insert is set up on the lower mould, through the cooperation of upper and lower moulds, can realize the forming of the stopper and supporting block on the pointer installation hole. When installing, place scale board on the upper surface of light box component, and the position of insertion hole corresponds to the position of each pointer installation hole on the upper surface of light box component, make the insertion hole sleeve at the outside of convex ring, and can shield the edge of pointer slot hole, at this time, the limiting portion is not between the stopper and supporting block, namely, the stopper and limiting portion staggered with each other, then make scale board along the upper surface of light box component translation, make it gradually move to the installation position, make both sides limiting portion all be embedded between the stopper and supporting block, at this time, the stopper is above the limiting portion, can block the limiting portion in the vertical direction by the stopper, and scale board is placed on the upper surface of light box component, thereby make scale board can receive the upper and lower limiting action of stopper and light box component, and scale board can not move upwards and separate from light box component, make scale board can stably install on the top of light box component, finally, can install pointer on the pivot again, when needing to disassemble, then take down pointer, then make scale board translation to the direction away from the installation position, make the limiting portion leave between the stopper and supporting block, and finally return to the state that the stopper is staggered with each other above, the limiting portion top will not receive the block of stopper, at this time, scale board can move along the vertical direction, make its insertion hole separate from the outside of convex ring, thereby take down the whole scale board.

[0007] Therefore, by using the mounting structure, the convex ring on the pointer mounting hole is matched with the insertion hole structure on the scale plate, and the relative position relationship between the stop blocks on both sides of the convex ring and the limiting portions on both sides of the insertion hole can be changed, the scale plate is prevented from being separated from the lamp box component by the limiting of the stop blocks and the limiting portions of the lamp box component, the installation of the scale plate on the lamp box component can be conveniently realized, the components for fixation are integrated into the lamp box component in the structure, so that additional assembly components are not needed to fix the scale plate, the structure is simple, the installation steps required in the installation process can be reduced, the installation operation is more convenient, the assembly speed is improved, and the convex ring and other parts can be shielded by the pointer and are not directly exposed, so that the aesthetic level of the entire instrument panel is ensured.

[0008] As a further improvement of the present scheme, the convex ring extends downward inside the through hole to form a reinforcing plate, and the two sides of the reinforcing plate are integrated with the inner wall of the pointer mounting hole. The above structure can improve the structural strength of the pointer mounting hole near the through hole, making the overall structure more stable.

[0009] As a further improvement of the present scheme, a first chamfer is arranged on the side of the stop block close to the limiting portion. The above structure can make the limiting portion move smoothly under the stop block, and can reduce the situation that each component is greatly worn due to the friction contact between the corner of the limiting portion and the stop block during assembly and disassembly.

[0010] As a further improvement of the present scheme, a second chamfer is arranged above the stop block. The above structure can make the insertion hole on the scale plate more smoothly fit outside the convex ring when the scale plate is assembled, and reduce the situation that the corner of the stop block scratches or wears the scale plate.

[0011] As a further improvement of the present scheme, the insertion hole comprises a first arc edge and a second arc edge arranged opposite to each other, the first arc edge and the second arc edge are connected by the limiting portion, the first arc edge is matched with the outer arc surface of the convex ring, and the chord length L2 of the second arc edge is greater than the spacing L3 between the outer sides of the two stop blocks, so that the insertion hole can fit outside the convex ring. The above structure can limit the movable direction of the scale plate along the upper surface of the lamp box component, so that the scale plate is more stable.

[0012] As a further improvement of the present scheme, the limiting portion is provided with a first straight edge, and the outer side of the convex ring is formed with a guide plane matched with the first straight edge. The above structure can make the scale plate more smoothly move during assembly and disassembly, and the limiting portion can be guided by the guide plane, so that the installation is more convenient.

[0013] As a further improvement of the present scheme, a third chamfer is further arranged on the side of the limiting portion close to the stop block. The above structure can make the limiting portion smoothly move along the outer side of the convex ring when the scale plate is assembled, and reduce the situation that the corner of the limiting portion scratches or wears the side surface of the convex ring. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0015] Figure 2 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0016] Figure 3 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art. Figure 2 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0017] Figure 4 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0018] Figure 5 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0019] Figure 6 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art. Figure 2 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0020] Figure 7 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art. Figure 2 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0021] Figure 8 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0022] Figure 9 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0023] Figure 10 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0024] Figure 11 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0025] Figure 12 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art. Figure 11 Figure 1 is a schematic view of the installation structure of a scale plate in the prior art.

[0026] Figure 1 is a schematic view of the installation structure of a scale plate in the prior art. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] If there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" can explicitly or implicitly include at least one of such features. In addition, the technical features of each embodiment can be arbitrarily combined. In order to make the description concise, not all possible combinations of the technical features in the embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] like Figures 2 to 9 As shown, the utility model provides an instrument scale plate mounting structure, including a light box component 1, a scale plate 2, and a pointer 5. The middle of the light box component 1 has a pointer slot 11, and the middle of the pointer slot 11 is provided with a pointer mounting hole 3. The pointer mounting hole 3 has a rotating shaft 6 for driving the pointer 5. The top of the rotating shaft 6 is inserted into the mounting sleeve 51 at the bottom of the pointer 5. The inner wall of the pointer mounting hole 3 extends upward with an integrally formed convex ring 31. The two sides of the convex ring 31 are provided with outwardly protruding blocks 32. The outer wall of the pointer mounting hole 3 A support block 33 is provided, and the support block 33 is located below the stop block 32. A through hole 34 corresponding to the stop block 32 is provided at a position opposite to the support block 33 and the stop block 32. The scale plate 2 is placed on the upper surface of the light box component 1, and a socket 4 is provided in the middle thereof. The size of the socket 4 is between the convex ring 31 and the pointer slot 11. It is sleeved on the outside of the convex ring 31 and can move relative to the convex ring 31. Limiting parts 43 are provided on both sides of the socket 4. After the scale plate 2 is moved to the installation position, the limiting parts 43 are embedded between the stop block 32 and the support block 33.

[0031] The convex ring 31 structure of the pointer mounting hole 3 is integrally formed by injection molding.Figure 10 and Figure 11 The upper and lower arranged mold includes an upper mold 7 and a lower mold 8, wherein two top rods 81 are arranged on two sides of the lower mold 8, the upper part of the top rod 81 is spaced apart from the rest of the lower mold 8, and thus when the lower mold 8 is matched with the upper mold 7, as shown in Figure 12 , the part of the top rod 81 that passes through the supporting block 33 forms a through hole 34 structure, and the top end of the top rod 81 and the upper mold 7 form a stop block 32, the stop block 32 and the supporting block 33 are both outwardly protruding and form an upper and lower opposite structure, and the through hole 34 is arranged so that the supporting block 33 and the stop block 32 are staggered in the vertical direction. Therefore, when injection molding, the upper mold 7 is placed into the pointer slot hole 11 from above the light box component 1, and the corresponding lower mold 8 is placed into the pointer slot hole 11 from below the light box component 1, and the lower mold 8 is provided with a top rod 81 that can be inserted into the position of the through hole 34 on the supporting block 33, and through the matching of the upper and lower molds, the integrated structure of the stop block 32 and the supporting block 33 on the pointer mounting hole 3 can be realized, and the number of components required for assembly when fixing the scale plate 2 is reduced, so as to simplify the installation steps.

[0032] As shown in Figure 3 , Figure 6 , the convex ring 31 extends downward to form a reinforcing plate 35 inside the through hole 34, and the two sides of the reinforcing plate 35 are integrated with the inner wall of the pointer mounting hole 3, and the reinforcing plate 35 can form an integrated structure through the above-mentioned upper and lower arranged mold during injection molding, which can improve the structural strength of the pointer mounting hole 3 near the through hole 34 and make the overall structure more stable.

[0033] As shown in Figure 7 , a first chamfer 321 is arranged on the side of the stop block 32 close to the limiting part 43, when the scale plate 2 moves in the direction close to the installation position, and the limiting part 43 is close to the stop block 32, the first chamfer 321 below the stop block 32 can play a smooth guiding role, so that the limiting part 43 can smoothly move below the stop block 32, and can reduce the situation that each part is greatly worn due to the friction contact between the corner of the limiting part 43 and the stop block 32 during assembly and disassembly. As shown in Figure 6 , a second chamfer 322 is further arranged above the stop block 32, so that when the scale plate 2 is assembled, the insertion hole 4 on the scale plate 2 can be more smoothly sleeved on the convex ring 31, and the situation that the corner of the stop block 32 causes scratches or wear on the scale plate 2 can be reduced. Among them, the first chamfer 321 and the second chamfer 322 can be circular arc chamfers or bevel chamfers.

[0034] Specifically, as shown in Figure 4As shown, the insertion hole 4 includes oppositely arranged first and second arc edges 41 and 42, and the first and second arc edges 41 and 42 are connected by a limiting portion 43. The first arc edge 41 is adapted to the outer arc surface of the convex ring 31, and the chord length L2 of the second arc edge is greater than the interval L3 between the two blocks, so that the insertion hole 4 can be sleeved outside the convex ring 31. Since the existing instrument panel is usually vertically or obliquely placed, in order to make the installation structure more stable, the above structure can be used to further limit the movable direction of the scale plate 2 along the upper surface of the light box component 1, and a sufficient interval is reserved between the first and second arc edges 41 and 42, so that the limiting portion 43 can come to or leave the installation position. The first arc edge 41 is adapted to the outer arc surface of the convex ring 31, so that the chord length L1 of the first arc edge is less than the interval L3 between the two blocks, and sufficient surface contact can be formed when the first arc edge 41 abuts against the outer side of the convex ring 31, so as to adapt to the vertical or oblique placement of the instrument panel, make the contact between the scale plate 2 and the convex ring 31 more firm, and avoid the left and right deviation or misplacement of the scale plate 2 after assembly. The chord length L2 of the second arc edge is greater than the interval L3 between the two blocks, so that the second arc edge 42 has a sufficient chord length, and when the scale plate 2 is placed on the upper surface of the light box component 1, the insertion hole 4 can be correspondingly sleeved outside the convex ring 31.

[0035] The above structure is installed before, referring to Figure 8 As shown, the scale plate 2 is placed on the upper surface of the light box component 1, and the position of the insertion hole 4 corresponds to the position of each pointer mounting hole 3 on the upper surface of the light box component 1, so that the insertion hole 4 is sleeved outside the convex ring 31. At this time, the limiting portion 43 is not between the block 32 and the supporting block 33, that is, the block 32 and the limiting portion 43 are staggered up and down, and a sufficient gap is reserved between the first arc edge 41 and the convex ring 31, so that the insertion hole 4 can move relative to the convex ring 31, so that the limiting portion 43 can come to the installation position during subsequent installation. The second arc edge 42 is sleeved outside the convex ring 31 and the block 32 thereon, so that the scale plate 2 can move in the vertical direction, and the insertion hole 4 can approach or separate from the outside of the convex ring 31 to place or remove the entire scale plate 2. Since the size of the insertion hole 4 is between the convex ring 31 and the pointer slot hole 11, the insertion hole 4 can be sleeved outside the convex ring 31 and relatively moved, and can also shield the edge of the pointer slot hole 11, so that the pointer slot hole 11 does not affect the overall appearance effect of the instrument panel.

[0036] During installation, the scale plate 2 is translated along the upper surface of the light box component 1, so that the first arc edge 41 gradually approaches the convex ring 31, and the second arc edge 42 gradually moves away from the convex ring 31, so that the scale plate 2 gradually moves to the installation position as shown in Figure 9 , so that the two limiting portions 43 are embedded between the corresponding block 32 and supporting block 33, and the first arc edge 41 can abut against the convex ring 31 to prevent further movement. At this time, referring to Figure 6 , Figure 7The stop block 32 is above the limiting portion 43, and the limiting portion 43 is blocked in the vertical direction by the stop block 32. Meanwhile, the scale plate 2 is placed on the upper surface of the light box component 1, so that the scale plate 2 is subjected to the upper and lower limiting actions of the stop block 32 and the light box component 1, and the scale plate 2 cannot move upward to be separated from the light box component 1, so that the scale plate 2 can be stably installed above the light box component 1.

[0037] After the scale plate 2 is fixed, the pointer 5 for pointing to the scale position is installed on the pointer mounting hole 3, the top of the rotating shaft 6 in the pointer mounting hole 3 is inserted into the mounting sleeve 51 at the bottom of the pointer 5, the lower portion of the rotating shaft 6 is connected with the motor output end, and the pointer 5 is driven to rotate by the rotating shaft 6. Since the pointer 5 is directly above the convex ring 31 and the insertion hole 4, the convex ring 31 and the insertion hole 4 can be effectively shielded and will not be directly exposed, so that the aesthetic level of the entire instrument panel is ensured.

[0038] When the scale plate 2 needs to be disassembled, the pointer 5 is first removed, and then the scale plate 2 is translated away from the installation position, so that the first arc edge 41 gradually moves away from the convex ring 31, the second arc edge 42 gradually moves close to the convex ring 31, and both sides of the limiting portion 43 are away from the stop block 32 and the supporting block 33 and finally return to the state of being staggered above and below the stop block 32, as shown in Figure 8 , the limiting portion 43 is not blocked by the stop block 32 above, and at this time, the scale plate 2 can be moved in the vertical direction, so that the insertion hole 4 is separated from the convex ring 31, and thus the entire scale plate 2 is removed.

[0039] As shown in Figure 8 , Figure 9 , the limiting portion 43 is provided with a first straight edge 44, and the convex ring 31 is formed with a guide plane 311 which is adapted to abut against the first straight edge 44, so that the limiting portion 43 can smoothly contact the guide plane 311 of the convex ring 31 through the first straight edge 44, the scale plate 2 can be more smoothly moved during assembly and disassembly, and the guide plane 311 can provide a certain guiding action to the limiting portion 43 to guide the scale plate 2 to move to the installation position, so that the installation is more convenient.

[0040] The limiting portion 43 is further provided with a third chamfer 46 on the side close to the stop block 32, as shown in Figure 3 , so that when the scale plate 2 is assembled, the limiting portion 43 can be smoothly moved along the outside of the convex ring 31 to the side of the guide plane 311, and the corner portion thereof can be reduced to scratch or wear the side surface of the convex ring 31. The third chamfer 46 can be a circular arc chamfer or an inclined edge chamfer.

[0041] In addition, the second arc edge 42 and the limiting portion 43 can be connected through a second straight edge 45 which is adapted to correspond to the stop block 32, as shown in Figure 3As shown, the distance between the second straight edges 45 on both sides of the insertion hole 4 is also greater than the distance L3 between the outer sides of the two blocks, ensuring that when the insertion hole 4 is sleeved outside the convex ring 31, the blocks 32 can be positioned between the second straight edges 45 on both sides, and the second straight edges 45 are matched with the straight edges on the outer sides of the blocks 32. During the process of assembling the scale plate 2 to make the insertion hole 4 sleeved outside the convex ring 31, the second straight edges 45 symmetrically arranged on both sides of the insertion hole 4 can be used for more accurate positioning, so that the installation process is smoother.

[0042] In summary, by using the installation structure of the present application, the convex ring 31 arranged on the pointer mounting hole 3 is matched with the insertion hole 4 on the scale plate 2, and the relative position relationship between the blocks 32 on both sides of the convex ring 31 and the limiting portions 43 on both sides of the insertion hole 4 can be changed. The scale plate 2 is prevented from being separated from the light box component 1 by the blocks 32 and the limiting of the light box component 1. The installation of the scale plate 2 on the light box component 1 can be conveniently realized. The components for fixation in the structure are integrated into the light box component 1, so that additional assembly components are not needed to fix the scale plate 2, the structure is simple, the installation steps required in the installation process can be reduced, the installation operation is more convenient, the assembly speed is improved, and the scale plate 2 can shield the pointer slot hole 11 on the light box component 1. The pointer 5 above the convex ring 31 can shield the convex ring 31, the insertion hole 4 and other parts, so that the installation structure in the instrument panel is not directly exposed, and the aesthetic degree of the entire instrument panel is ensured.

[0043] The above description is only the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation or direct / indirect application in other related technical fields within the concept of the present application, as described in the present application and the drawings, is included in the patent protection scope of the present application.

Claims

1. An instrument scale plate mounting structure, comprising a light box component (1), a scale plate (2), and a pointer (5), characterized in that: The middle of the light box component (1) is provided with a pointer slot (11), and the middle of the pointer slot (11) is provided with a pointer mounting hole (3). A rotating shaft (6) for driving the pointer (5) is provided in the pointer mounting hole (3), and the top of the rotating shaft (6) is inserted into the mounting sleeve (51) at the bottom of the pointer (5). An integrally formed convex ring (31) is extended upward from the inner wall of the pointer mounting hole (3), and outwardly protruding stoppers (32) are provided on both sides of the convex ring (31). A supporting block (33) is provided on the outer wall of the pointer mounting hole (3), and the supporting block (33) is located below the stopper (32). A through hole (34) corresponding to the stopper (32) is provided at a position where the support block (33) and the stopper (32) are opposite to each other. The scale plate (2) is placed on the upper surface of the light box component (1), and a socket (4) is provided in the middle thereof. The socket (4) has a size between the convex ring (31) and the pointer slot (11). The socket (4) is sleeved outside the convex ring (31) and can move relative to the convex ring (31). Limiting portions (43) are provided on both sides of the socket (4). After the scale plate (2) moves to the installation position, the limiting portions (43) are embedded between the stopper (32) and the support block (33).

2. The installation structure of the instrument scale plate according to claim 1, characterized in that: The convex ring (31) extends downward inside the through hole (34) to form a reinforcing plate (35), and both sides of the reinforcing plate (35) are integrally connected to the inner wall of the pointer mounting hole (3).

3. The installation structure of the instrument scale plate according to claim 1, characterized in that: A first chamfer (321) is provided below the stopper (32) on one side close to the limiting portion (43).

4. The installation structure of the instrument scale plate according to claim 1, characterized in that: A second chamfer (322) is provided above the stopper (32).

5. The installation structure of the instrument scale plate according to any one of claims 1 to 4, characterized in that: The socket (4) comprises a first arc edge (41) and a second arc edge (42) arranged opposite to each other, the first arc edge (41) and the second arc edge (42) being connected via a limiting portion (43), the first arc edge (41) being adapted to the outer arc surface of the convex ring (31), and the chord length L2 of the second arc edge being greater than the spacing L3 between the outer sides of the two stoppers, so that the socket (4) can be sleeved outside the convex ring (31).

6. The installation structure of the instrument scale plate according to claim 5, characterized in that: The limiting portion (43) is provided with a first straight edge (44), and a guide plane (311) adapted to abut against the first straight edge (44) is formed on the outer side of the convex ring (31).

7. The installation structure of the instrument scale plate according to claim 5, characterized in that: The limiting portion (43) is further provided with a third chamfer (46) on one side close to the stopper (32).

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