Watchcase testing fixture

Abstract

The utility model discloses a gauge case testing tool, and relates to the technical field of measurement and testing. Comprising a base plane and a guide ring column, the base plane is coaxially connected to the guide ring column below, a step transition structure is formed at the joint of the base plane and the guide ring column, a detection plane is formed on the lower end plane of the step transition structure, an extension part is arranged on one side, outside the guide ring column, of the base plane, and a positioning pin is arranged below the extension part. The problems that in the prior art, rapid positioning detection cannot be achieved, and production efficiency is low are solved, and the purposes of being low in cost, easy to operate, convenient to use and capable of rapidly detecting abnormity of the movement positioning structure of the water meter shell are achieved.

Description

Technical Field

[0001] This utility model relates to the field of measurement and testing technology, and in particular to the measurement of length, thickness or similar linear dimensions. Background Technology

[0002] Non-magnetic water meters, as electromechanical signal conversion devices based on the principle of electromagnetic eddy currents, have a core component consisting of a pointer structure with a metal induction element. This structure achieves pulse signal acquisition through the eddy current effect induced by the movement of a metal body in a magnetic field. These water meters require a continuous monitoring mechanism during electromechanical conversion to ensure the integrity and real-time performance of the pulse signal. Therefore, the spatial positioning between the electronic sampling module and the pointer must meet high-precision synchronization requirements. The installation position of the signal-triggered pointer depends not only on the attached movement components but also on the structural matching of supporting components such as the meter case. In practical design, the pointer positioning is usually determined by the molding process of the movement components, and its standardized production process ensures the positional consistency between different components.

[0003] For example, Chinese Patent Publication No. CN202182681U discloses an inspection tool, providing the following technical solution: This utility model discloses an inspection tool including a base. The base has several positioning blocks that mate with the surface of a product. The base also has several threaded installation inspection holes corresponding to the mounting holes on the product, and positioning pin inspection holes corresponding to the positioning pin holes on the product. The base has at least two guide pillars, on which a top cover and a top pad are movably mounted sequentially. The top cover and the top pad are connected by bolts, and a mounting positioning pin is provided between the top cover and the top pad. The top cover has an irregular through hole that mates with the shape of the product. The top pad has an inspection hole corresponding to the inner hole of the product, and an inspection post is movably mounted within the inspection hole. A bottom pad is provided under the base plate, and a mounting positioning pin is provided between the base and the bottom pad. The bottom pad has through holes corresponding to the installation inspection holes and positioning pin inspection holes. This inspection tool can conveniently inspect whether the shape of the product and the positions of each mounting hole and connecting hole are qualified. However, the aforementioned inspection tool cannot be applied to the testing of non-magnetic water meters. It cannot detect the deviation of the signal pointer of a non-magnetic water meter, lacks a guide slope structure adapted to the positioning groove of the movement, and relies on traditional inspection hole positioning, which cannot achieve fast and accurate positioning. Utility Model Content

[0004] This invention solves the problems of inability to quickly locate and detect defects and low production efficiency in the prior art. It proposes a meter casing inspection tool that achieves the goals of low cost, simple operation, convenient use, and rapid detection of abnormalities in the movement positioning structure of water meter casings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A watch case inspection fixture includes a base surface and a guide ring post. The base surface is coaxially connected to the guide ring post below it, and the joint between the two forms a stepped transition structure. The lower plane of the stepped transition structure forms a detection plane. The base surface has an extension on one side outside the guide ring post, and a positioning pin is provided below the extension.

[0007] The detection plane formed by the stepped transition can accurately verify the flatness of the upper surface of the watch case. Combined with the positioning pin of the extension part, it can realize multi-dimensional positioning detection to ensure that the concentricity of the watch case and the positioning hole of the electronic module meets the requirements.

[0008] Preferably, the base surface has a circular ring structure, and the inner ring of the base surface has the same diameter as the guide ring post.

[0009] The equal-diameter design of the annular base and the guide ring ensures the overall coaxiality of the fixture, effectively avoiding measurement errors caused by structural eccentricity during the inspection process.

[0010] Preferably, the upper part of the inner ring wall of the base surface is provided with cross-shaped intersecting hand grips, and the four connecting ends of the hand grips form an integral fixing structure with the inner ring wall.

[0011] The cross-shaped hand grips form a four-point grip position, which not only ensures the stability of the grip during manual operation, but also enhances the overall strength of the inspection tool through the integrated structure and avoids stress concentration.

[0012] Preferably, a number of outer limiting ribs are evenly distributed on the outer wall of the guide ring column, and the included angle between adjacent outer limiting ribs is 60°.

[0013] Preferably, a positioning platform is provided between the extension portion and the guide ring post, the positioning platform is fixed on the outer wall of the guide ring post, and its lower edge is provided with a guide slope.

[0014] The guide slope design of the positioning stage enables the self-guiding insertion function of the movement positioning slot, reducing assembly difficulty.

[0015] Preferably, the bottom of the positioning pin is provided with a guide protrusion, and the connection between the extension and the positioning pin is provided with a root-reinforcing frustum.

[0016] The guide protrusion ensures that the positioning pin is accurately inserted into the positioning hole of the electronic module, and the reinforced truncated cone at the root increases the bending strength of the positioning pin and extends the service life of the gauge.

[0017] Preferably, the detection plane is a flat plane with a flatness tolerance of no more than 0.1 mm.

[0018] Preferably, the watch case fixture is manufactured by machining, injection molding, or 3D printing.

[0019] The watch case fixture does not require bulky metal materials; it can be molded or 3D printed, reducing manufacturing costs and making it easy to use.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows.

[0021] 1. This utility model significantly improves positioning accuracy and measurement reliability through the coaxial design of the detection plane and guide ring column formed by the stepped transition structure. The circular base surface and guide ring column are of equal diameter to ensure the overall coaxiality of the fixture and avoid eccentricity errors; the flatness tolerance of the detection plane is ≤0.1mm, which can directly verify the flatness of the upper end surface of the case. At the same time, the evenly distributed outer limiting ribs enhance the guiding stability, and the locating pin of the extension part cooperates with the root reinforcing frustum to further achieve multi-dimensional precise positioning.

[0022] 2. The cross-shaped interlocking hand grips of this utility model enhance grip stability through four grip points, and the integrated structure avoids stress concentration, balancing strength and operational comfort. The guide slope design of the positioning platform simplifies the assembly process of the movement positioning slot, enabling self-guided insertion and reducing the difficulty of manual adjustment; the guide protrusion at the bottom of the positioning pin ensures quick alignment with the electronic module positioning hole, reducing the time spent on repeated calibration.

[0023] 3. This utility model supports injection molding or 3D printing processes, enabling lightweight and low-cost manufacturing. The use of non-metallic materials reduces mold development difficulty and shortens the production cycle. Furthermore, the processing and molding methods are flexible and adaptable to small-batch or customized needs. Compared to traditional metal inspection tools, it significantly reduces costs and is easier to carry and maintain, making it particularly suitable for the rapid inspection of precision small watch cases, demonstrating significant economic and environmental benefits. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of one embodiment of a watch case inspection tool according to the present invention.

[0025] Figure 2 This is a schematic diagram illustrating the testing of a water meter casing and the casing inspection tool according to one embodiment of the present invention.

[0026] Illustration:

[0027] Water meter housing 1, movement mounting hole 1-1, movement positioning groove 1-2, electronic module positioning hole 1-3, upper end face 1-4, housing inspection fixture 2, guide ring post 2-1, outer limit rib 2-1-1, base surface 2-2, detection plane 2-2-1, positioning platform 2-3, guide inclined surface 2-3-1, positioning pin 2-4, guide protrusion 2-4-1, root reinforcing frustum 2-4-2, hand grip rib 2-5. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings. The proportions of the components are not drawn to scale, and the proportions and dimensions shown in the drawings should not limit the essential technical solutions of this utility model. These embodiments do not exhaustively describe all details, nor do they limit this utility model to merely the specific embodiments described.

[0029] See Figures 1 to 2 As shown, a watch case inspection fixture includes a base surface 2-2 and a guide ring post 2-1. The base surface 2-2 is coaxially connected to the guide ring post 2-1 below, and a stepped transition structure is formed at the joint of the two. The lower plane of the stepped transition structure forms a detection plane 2-2-1. The base surface 2-2 has an extension on one side outside the guide ring post 2-1, and a positioning pin 2-4 is provided below the extension.

[0030] like Figure 1 In one embodiment shown, Figure 1 This is a schematic diagram of one embodiment of a watch case inspection fixture according to the present invention. The watch case inspection fixture 2 adopts a coaxial stepped structure design and mainly includes the following components:

[0031] The guide ring post 2-1 is a cylindrical main structure with an outer diameter matching the movement mounting hole 1-1 of the water meter housing 1, and a height slightly greater than the depth of the movement mounting hole. In this embodiment, six outer limiting ribs 2-1-1 are evenly distributed on the outer wall, with an included angle of 60° between adjacent limiting ribs. The protrusion height of the outer limiting ribs is 0.5mm, used to form a clearance fit with the inner wall of the movement mounting hole to ensure the guiding stability when the gauge is inserted vertically. The base surface 2-2 is a circular annular planar structure with an inner diameter equal to the outer diameter of the guide ring post 2-1, and the two are connected by a stepped transition structure. The lower end surface of the base surface 2-2 is machined into a detection plane 2-2-1 with a flatness tolerance ≤0.1mm. During detection, this plane must be completely in contact with the upper end surface 1-4 of the water meter housing 1.

[0032] The positioning platform 2-3 is a protruding structure fixed to the outer wall of the guide ring post 2-1, with a guide slope 2-3-1 along its lower edge. The width of the positioning platform matches the positioning groove 1-2 of the watch case movement, and is used to guide the inspection tool into the positioning groove of the movement.

[0033] The locating pin 2-4 is located below the extension of the base surface 2-2, with a guide protrusion 2-4-1 at the bottom. The root of the pin is connected to the base surface via a root reinforcing frustum 2-4-2, which significantly improves the bending strength of the locating pin. The grip rib 2-5 is located on the upper part of the inner ring wall of the base surface 2-2, adopting a cross-shaped design, with the four ends integrally injection molded with the ring wall. The rib has a rectangular cross-section, with increased thickness at the intersections, and chamfered edges on all sides to form an ergonomic grip area.

[0034] In another embodiment, the guide ring post serves as the main guiding structure of the fixture, with its cylindrical outer contour forming a clearance fit with the watch case movement mounting hole 1-1. The outer limiting ribs 2-1-1, evenly distributed circumferentially on the outer wall, are arranged at equal angles. Through the line contact mode between the rib protrusions and the hole wall, frictional resistance is reduced, and multi-point balanced support is formed. The included angle design between adjacent ribs enables the guide ring post to achieve self-centering during insertion, effectively offsetting any slight ellipticity or machining deviation that may exist in the watch case movement mounting hole. The protrusion height of the outer limiting ribs is optimized to provide sufficient guiding contact area while avoiding the risk of jamming due to interference fit. The axial length of the guide ring post is slightly greater than the depth of the movement mounting hole, ensuring that there is still operational margin after the fixture is inserted, facilitating manual adjustment and observation. The base surface adopts a ring-shaped planar structure, with its inner diameter precisely matching the outer diameter of the guide ring post, forming a seamless stepped transition connection. The lower end face of the base surface is machined into a high-precision inspection plane 2-2-1. This plane undergoes grinding or precision milling during manufacturing to ensure its surface flatness meets inspection requirements. After the fixture is fully inserted into the watch case, the fit between the inspection plane and the upper end face 1-4 of the watch case directly reflects the machining quality of the watch case end face. The extension portion on the outer side of the guide ring post of the base surface provides installation space for the locating pin 2-4 through an asymmetrical structural design, while balancing the overall center of gravity distribution of the fixture.

[0035] The positioning platform is fixed at a specific position on the outer wall of the guide ring column, and its width precisely corresponds to the opening size of the movement positioning groove 1-2 in the watch case. The guide ramp 2-3-1 at the lower edge of the positioning platform adopts a ramp transition design. During the insertion of the gauge, when this ramp contacts the edge of the movement positioning groove, it generates a component force, guiding the gauge to automatically correct radial position deviation. The inclination angle of the guide ramp has been optimized through dynamic simulation to ensure sufficient guiding sensitivity while avoiding increased insertion resistance due to excessively steep angles. The axial position of the positioning platform forms a spatial relationship with the detection plane, ensuring that when the gauge is fully inserted, the detection plane and the upper end face of the watch case reach the theoretically designed position. The positioning pin extends vertically downward through the extension section, and the guide protrusion 2-4-1 at its bottom adopts a tapered geometry, generating a guiding effect when it contacts the positioning hole 1-3 of the electronic module, compensating for hole machining errors. The reinforcing frustum 2-4-2 at the root of the pin adopts a gradual cross-sectional design to optimize stress distribution while ensuring the rigidity of the positioning pin, preventing root fatigue fracture caused by frequent insertion and removal. The axial position of the locating pin forms a spatial constraint relationship with the detection plane. When the fixture is fully in place, the insertion depth of the locating pin directly reflects the machining accuracy of the electronic module mounting hole.

[0036] The cross-shaped grip ribs are located on the upper part of the inner ring wall of the base surface, with their intersection point coinciding with the axis of the fixture, forming a symmetrical four-way gripping area. The ribs have a rectangular cross-section, and the intersection points are locally thickened to enhance structural rigidity. The chamfered edges eliminate the pressure on the hand caused by sharp edges. The integral molding process between the grip ribs and the inner wall of the base surface ensures a continuous force transmission path. During operation, the gripping force is evenly distributed to the entire structure of the base surface through the four endpoints, avoiding local stress concentration. This design balances operating comfort and fixture stability, making it particularly suitable for long-term batch inspection operations.

[0037] This utility model device significantly improves detection efficiency and accuracy through multi-dimensional structural innovation. Firstly, the coaxial stepped design of the guide ring column's outer limiting rib and the base surface forms a dual positioning reference, ensuring self-centering during fixture insertion and enabling rapid flatness determination through direct contact between the detection plane and the end face of the casing. The guide ramp of the positioning platform and the guide protrusion of the positioning pin constitute a collaborative guiding system; the former corrects radial deviation, and the latter compensates for axial alignment errors, significantly reducing the difficulty of manual adjustment. Secondly, the cross-symmetrical layout of the handgrip ribs and the stress-optimized design of the root-reinforced frustum improve operational convenience while extending the fixture's service life, making it particularly suitable for high-intensity, repetitive use scenarios. Furthermore, the asymmetrical layout of the base extension rationally allocates functional areas, integrating core functional modules such as the detection plane and positioning pin mounting positions within a limited space, achieving a compact design. In addition, this utility model device does not require bulky metal materials; it can be molded or 3D printed, reducing manufacturing costs and facilitating use.

[0038] like Figure 2 In one embodiment shown, Figure 2 This is a schematic diagram illustrating the testing of a water meter casing and the casing inspection tool according to one embodiment of the present invention. The specific implementation steps of the testing process are as follows:

[0039] 1. During the pre-alignment stage, the operator holds the hand grip 2-5 and aligns the guide ring 2-1 with the watch case movement mounting hole 1-1. The outer limit rib 2-1-1 guides the gauge to slide down along the hole wall until the positioning table 2-3 contacts the edge of the movement positioning groove 1-2.

[0040] 2. During the precise positioning stage, slightly rotate the fixture to allow the guide bevel 2-3-1 to engage with the positioning groove 1-2 of the mechanism. At this point, the positioning pin 2-4 and the positioning hole 1-3 of the electronic module are coaxial. Continue to press down on the fixture, and the guide protrusion 2-4-1 will automatically correct the hole position deviation.

[0041] 3. During the testing and judgment stage, when the testing plane 2-2-1 is completely aligned with the upper surface 1-4 of the watch case, and only the root reinforcing truncated cone 2-4-2 of the positioning pin 2-4 is exposed, it indicates that the watch case positioning structure is qualified. The following situations are considered unqualified: the testing plane cannot be aligned; the positioning pin cannot be inserted into the electronic module positioning hole; the guide ring is stuck in the movement mounting hole.

[0042] In another embodiment, the water meter casing has a movement mounting hole, a movement positioning groove, an electronic module positioning hole, and an upper end face. The casing fixture has a ring cylinder, a ring-shaped base surface, a positioning platform, a positioning pin, and a handle rib. The outer cylindrical surface of the ring cylinder has several outer limiting ribs; the ring-shaped base surface has a lower plane; the positioning platform is located on the outer cylindrical surface of the ring cylinder, and its lower edge has a guide slope; the positioning pin is located on the extension of the ring-shaped base surface outside the ring, and its top has a guide protrusion and its root has a reinforcing frustum; the handle rib is located on the inner cylindrical surface of the ring cylinder. The casing fixture can be machined, injection molded, or 3D printed.

[0043] During the meter casing positioning test, after the movement mounting hole 1-1, movement positioning groove 1-2, electronic module positioning hole 1-3, and upper end face 1-4 on the water meter casing 1 are all machined, hold the hand gripping rib 2-5 on the casing inspection tool 2 and insert the outer limiting rib 2-1-1 along the movement mounting hole 1-1. Under the action of the guide slope 2-3-1, the positioning platform 2-3 aligns and inserts into the movement positioning groove 1-2 until the inspection plane 2-2-1 is flush with the upper end face 1-4. During this process, the positioning pin 2-4 should be smoothly inserted into the electronic module positioning hole 1-3 under the guidance of the guide protrusion 2-4-1, leaving only the root reinforcing frustum 2-4-2 exposed. If the positioning pin 2-4 cannot be inserted into the electronic module positioning hole 1-3 during this process, or if the inspection plane 2-2-1 is not flush with the upper end face 1-4, it indicates that the water meter casing 1 is unqualified.

[0044] This invention significantly improves the efficiency of watch case positioning accuracy testing through its inspection process. Firstly, the initial guidance of the outer limiting rib of the guide ring post and the movement mounting hole, the radial correction of the positioning platform guide slope, and the axial compensation of the positioning pin guide protrusion effectively reduce the subjective influence of manual operation on the test results. Secondly, the fit between the inspection plane and the upper surface of the watch case, and the exposed height of the reinforcing frustum at the root of the positioning pin, can be quickly determined without relying on precision measuring instruments, greatly shortening the single-piece inspection time, making it particularly suitable for batch inspection scenarios on production lines. Furthermore, the equal-angle distribution of the outer limiting ribs in the fixture structure design ensures coaxiality, the four-point grip of the cross-shaped handgrip optimizes force distribution, and the design of the positioning platform guide slope and the positioning pin guide protrusion avoids the risk of misjudgment caused by a single positioning reference in traditional fixtures. The self-correcting characteristics of the mechanical structure also reduce the frequency of repeated calibration, significantly improving inspection consistency. In addition, this invention's device can be manufactured using machining, injection molding, or 3D printing processes, highlighting its process adaptability flexibility. The introduction of non-metallic materials ensures structural strength while reducing manufacturing costs and weight.

[0045] In summary, this utility model discloses a meter casing inspection tool, enabling rapid detection and judgment of the positioning accuracy of water meter casings. The device employs a coaxial stepped structure design, consisting of five core components: a guide ring column, a base surface, a positioning platform, a positioning pin, and hand-held ribs. The guide ring column, as the main guiding structure, has external limiting ribs evenly distributed circumferentially on its cylindrical outer wall, forming multi-point balanced support. The limiting ribs form a clearance fit with the casing movement mounting holes, providing both guiding stability and self-centering function, effectively offsetting hole ellipticity errors. The base surface is seamlessly connected to the guide ring column through a stepped transition structure. Its lower end face is precision-machined to form a detection plane with a flatness tolerance ≤0.1mm. The complete fit between this plane and the upper end face of the casing directly reflects the end face machining quality. The asymmetrical design of the base surface extension cleverly integrates the positioning pin mounting position and optimizes the center of gravity distribution.

[0046] The guide slope on the outer wall of the positioning platform is designed with optimized angles based on dynamics, generating a component force during insertion to guide radial deviation correction. The tapered guide protrusion at the bottom of the positioning pin works in conjunction with the reinforcing frustum at the root, achieving error compensation for the electronic module positioning hole and improving bending strength through cross-sectional gradient optimization. The cross-shaped handle is ergonomically designed, with its four ends integrally formed with the inner wall of the base surface. The intersections are thickened to enhance rigidity, and the rectangular cross-section combined with chamfered edges creates a comfortable grip area, evenly distributing operating force and avoiding stress concentration. In terms of manufacturing processes, it supports machining, injection molding, and 3D printing. The use of non-metallic materials reduces weight and cost while ensuring structural strength, making it particularly suitable for batch testing scenarios on production lines. Therefore, this utility model device is lightweight and convenient, compatible with both manual and automated scenarios, providing a simple, user-friendly inspection to determine whether the watch case positioning structure meets usage requirements, without the need for complex operations.

[0047] This utility model is not limited to the above-described embodiments. Any changes made to its shape or material composition, as long as the structural design provided by this utility model is adopted, are considered a variation of this utility model and should be regarded as within the protection scope of this utility model.

Claims

1. A watch case inspection tool, characterized in that, It includes a base surface (2-2) and a guide ring post (2-1). The base surface (2-2) is coaxially connected to the guide ring post (2-1) below. The joint between the two forms a stepped transition structure. The lower plane of the stepped transition structure forms a detection plane (2-2-1). The base surface (2-2) has an extension on one side outside the guide ring post (2-1). A positioning pin (2-4) is provided below the extension.

2. The watch case inspection fixture according to claim 1, characterized in that, The base surface (2-2) has a circular ring structure, and the inner ring of the base surface (2-2) has the same diameter as the guide ring post (2-1).

3. The watch case inspection fixture according to claim 2, characterized in that, The upper part of the inner ring wall of the base surface (2-2) is provided with cross-shaped intersecting hand-holding ribs (2-5), and the four connecting ends of the hand-holding ribs (2-5) form an integral fixed structure with the inner ring wall.

4. A watch case inspection fixture according to claim 3, characterized in that, The outer wall of the guide ring column (2-1) has a number of outer limiting ribs (2-1-1) evenly distributed, and the included angle between adjacent outer limiting ribs (2-1-1) is 60°.

5. A watch case inspection fixture according to claim 3, characterized in that, A positioning platform (2-3) is provided between the extension portion and the guide ring post (2-1). The positioning platform (2-3) is fixed on the outer wall of the guide ring post (2-1), and its lower edge is provided with a guide slope (2-3-1).

6. A watch case inspection fixture according to claim 5, characterized in that, The bottom of the positioning pin (2-4) is provided with a guide protrusion (2-4-1), and the connection between the extension and the positioning pin (2-4) is provided with a root reinforcing truncated cone (2-4-2).

7. A watch case inspection fixture according to claim 5, characterized in that, The detection plane (2-2-1) is a flat plane with a flatness tolerance of no more than 0.1 mm.

8. A watch case inspection fixture according to any one of claims 1 to 7, characterized in that, The watch case gauge (2) is manufactured by machining, injection molding, or 3D printing.

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