Test shell for differential mechanical movement
By designing a test shell for differentiated mechanical movements, sealed packaging and protection of multiple movements is achieved, and the problems of dust pollution and high cost during movement testing are solved, reducing testing costs and improving testing reliability.
Patent Information
- Application Number
- CN202422341473.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-25
AI Technical Summary
In the prior art, mechanical watch movements are susceptible to dust contamination during testing and have high testing costs. Especially for differentiated movements, multiple test shells are required to cause increased costs, and the movements are susceptible to damage during testing.
A test shell for differentiated mechanical movements is designed, including a cylindrical shell, a solid machine inner cover and a watch handle. By setting a detachable solid machine inner cover and an elastic fixing mechanism in the cylindrical shell, the sealing and protection of a variety of movements is realized, reducing the number of test shells used.
Effectively protect the movement from dust pollution, reduce testing costs, improve the reliability of test results, and avoid damage to the movement during the test.
Smart Images
Figure CN223065659U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of watch quality inspection, in particular to a test case for a differential mechanical movement. Background Art
[0002] With the increase in the functions of mechanical watches, the complexity of their internal structures has increased, thereby increasing the quality risks of mechanical watches. Therefore, before the mechanical watches leave the factory, a large number of process inspections are required to ensure the quality of the movements. In particular, by testing the reliability of the mechanical movements to evaluate whether this mechanical movement meets the standards and is suitable for use. The reliability of the mechanical movement is used to characterize the performance of whether the internal structure will fail during the standard test process of the mechanical movement. For a variety of differential mechanical movements, currently, mainly various experimental methods such as reliability experiments and multi-directional continuous running are used for testing. By extending the test cycle, various problems existing in the mechanical movement can be fully discovered. However, in the above test methods, the movement is directly exposed to the external environment for testing, and the test time is relatively long. The movement is easily contaminated by dust, thereby affecting the running performance of the movement. Although testing the movement in a finished watch case can avoid movement contamination, however, due to the destructiveness of some experiments, the appearance parts of the finished watch are easily damaged, thereby resulting in losses due to the inability to sell the watch; and for a variety of differential mechanical movements, each mechanical movement needs to be equipped with a test case, which increases the test cost of the watch. Summary of the Utility Model
[0003] Based on this, in view of the above deficiencies, it is necessary to provide a test case for a differential mechanical movement, which can realize the testing and effective protection of a variety of mechanical movements through one test case, and reduces the test cost of the watch.
[0004] A test case for a differential mechanical movement includes:
[0005] A cylindrical shell, the inner cavity of the cylindrical shell forms a test space, the top of the cylindrical shell is sealed with a transparent shell mirror, the bottom of the cylindrical shell is sealed with a bottom cover, and at least two handle tubes are fixedly spaced on the outer ring side surface of the cylindrical shell. The inner cavity of the handle tube is communicated with the test space, and the inner diameters of the handle tubes are different;
[0006] At least two movement fixing inner covers, the at least two movement fixing inner covers are selectively received in the test space, and the movement fixing inner cover is detachably connected to the inner wall of the cylindrical shell. A through hole is formed in the middle of the movement fixing inner cover, which penetrates the upper and lower surfaces of the movement fixing inner cover and is used for receiving the movement to be tested. The through hole diameters of the movement fixing inner covers are different. A step for supporting the movement to be tested is provided on the inner wall of the through hole. A through slot or a through hole is formed in the lower surface of the movement fixing inner cover, which penetrates the inner and outer side walls of the movement fixing inner cover and is communicated with the through hole and the inner cavity of the handle tube respectively;
[0007] A first fixing mechanism, which is located in the test space and is detachably connected to the movement to be tested housed in the through hole, and the first fixing mechanism is elastically engaged with the inner fixing cover of the movement; and
[0008] A crown, which is rotatably inserted into one of the crown tubes, a crown core is fixed at the end of the crown, and the crown core passes through the crown tube and is drivingly connected to the movement to be tested.
[0009] In one embodiment, twelve test points are evenly spaced in the circumferential direction of the cylindrical shell, and each crown tube is fixed on the outer circumferential side of the cylindrical shell and corresponds to one test point.
[0010] In one embodiment, three crown tubes are fixedly spaced on the outer circumferential side of the cylindrical shell, and three jacks corresponding to and communicating with the inner cavities of the respective crown tubes are opened on the outer circumferential side of the cylindrical shell. The jacks penetrate the inner and outer walls of the cylindrical shell, and the aperture of each jack is the same as the inner diameter of the corresponding crown tube.
[0011] In one embodiment, a concave position is respectively opened at three test points on the outer circumferential side of the cylindrical shell corresponding to the 1 o'clock, 3 o'clock, and 5 o'clock of the process dial, and a jack penetrating the inner wall of the cylindrical shell is opened on the bottom plane of each concave position.
[0012] In one embodiment, the apertures of the three jacks are 1.6 mm, 1.8 mm, and 2.0 mm respectively.
[0013] In one embodiment, the first fixing mechanism includes a movement fixing piece that elastically abuts against the semi-circular notch at the bottom of the movement to be tested and the lower surface of the inner movement fixing cover respectively, and a movement fixing nail that passes through the movement fixing piece and is locked on the movement to be tested.
[0014] In one embodiment, an annular limiting protrusion is fixed on the inner wall of the cylindrical shell, at least one groove is opened below the annular limiting protrusion on the inner wall of the cylindrical shell, and the upper surface of the inner movement fixing cover is in limiting abutment with the lower surface of the annular limiting protrusion; the test shell further includes at least one second fixing mechanism, and the second fixing mechanism includes an inner cover fixing piece that is inserted into the groove and elastically abuts against the lower surface of the inner movement fixing cover and the inner wall of the groove respectively, and an inner cover fixing nail that passes through the inner cover fixing piece and is locked on the inner movement fixing cover.
[0015] In one embodiment, the inner movement fixing cover is in clearance fit with the inner wall of the cylindrical shell.
[0016] In one embodiment, an annular notch is provided at each of the inner edges of the upper surface and the lower surface of the cylindrical shell, and a sealing rubber ring is provided in each of the two annular notches.
[0017] Implementing the test case for the differential mechanical movement of the present utility model, by designing a test case to replace the watch case for encapsulation, it is possible to avoid losses caused by damage to the watch case during the testing process; when testing multiple differential mechanical movements, an appropriate-sized movement fixing inner cover can be selectively selected and installed in the cylindrical case body to achieve the installation of the corresponding movement to be tested in the test case, so as to test each movement. While protecting the movement through sealed encapsulation of the test case and preventing the movement from being contaminated by dust, multiple movements can be tested with one test case, reducing the number of test cases used and lowering the testing cost of the watch. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 FIG. is a schematic cross-sectional structure diagram of the test case in an embodiment of the present utility model;
[0019] Figure 2 FIG. is a front view of the test case with the movement to be tested installed therein in an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the following detailed description of the specific embodiments of the present utility model will be made in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.
[0021] Please refer to Figure 1 and Figure 2, the present utility model discloses a test shell 10 for differential mechanical movements, which can realize the testing and effective protection of various mechanical movements and reduce the watch testing cost. The test shell includes a cylindrical shell 100, at least two movement-fixing inner covers 200, a first fixing mechanism, and a crown 300. The inner cavity of the cylindrical shell 100 forms a test space 110. The top of the cylindrical shell 100 is sealed with a transparent shell mirror 400, and the bottom of the cylindrical shell 100 is sealed with a bottom cover 500. In this way, the cylindrical shell 100, the transparent shell mirror 400, and the bottom cover 500 jointly encapsulate to form a sealed test space 110 to ensure the reliability of the movement testing operation. At least two stem tubes 120 are fixedly spaced on the outer circumferential side of the cylindrical shell 100. The inner cavity of the stem tube 120 communicates with the test space 110, and the inner diameters of the stem tubes 120 are different. By providing at least two stem tubes 120 on the outside of the cylindrical shell 100, the stem insertion of at least two different models of movements 20 can be satisfied. In this embodiment, at least two movement-fixing inner covers 200 are selectively received in the test space 110, and the movement-fixing inner cover 200 is detachably connected to the inner wall of the cylindrical shell 100. That is to say, only one movement-fixing inner cover 200 is installed in the cylindrical shell 100 at a time to clamp the corresponding model of movement 20, so as to realize the positioning of the movement 20. A through hole 210 is provided in the middle of the movement-fixing inner cover 200, which penetrates the upper and lower surfaces of the movement-fixing inner cover 200 and is used to receive the movement 20 to be tested. The diameters of the through holes 210 of the movement-fixing inner covers 200 are different to adapt to the clamping of different models of movements 20. A step 220 for supporting the movement 20 to be tested is provided on the inner wall of the through hole 210. The step 220 is used to limit the movement 20 along the axial direction of the cylindrical shell 100 to prevent the movement 20 from falling off the movement-fixing inner cover 200 under the action of its gravity. A through slot 230 or a through hole is provided on the lower surface of the movement-fixing inner cover 200, which penetrates the inner and outer walls of the movement-fixing inner cover 200 and communicates with the through hole 210 and the inner cavity of the stem tube 120 respectively. The through slot 230 or the through hole is used to provide a through channel for the stem of the movement 20. The first fixing mechanism is located in the test space 110 and is detachably connected to the movement 20 to be tested received in the through hole 210, and the first fixing mechanism is elastically matched with the movement-fixing inner cover 200 to realize the shock-absorbing installation of the movement 20 in the test shell, thereby reducing the external impact on the movement 20 during the test and improving the reliability of the test results. The crown 300 is rotatably inserted into a stem tube 120, and a stem 310 is fixed to the end of the crown 300. The stem 310 passes through the stem tube 120 and is drivingly connected to the movement 20 to be tested. In this embodiment, before the movement 20 to be tested is installed in the test shell, a process hour hand 30, a process minute hand 40, a process dial 50, etc. also need to be installed on the upper surface of the movement 20. In this way, when the movement 20 is installed in the test shell, during the test, by adjusting the stem tube 120, the rotation of the process hour hand 30 and the process minute hand 40 relative to the process dial 50 can be observed to judge the corresponding performance of the movement 20.
[0022] The cylindrical housing 100 is used to install the other components and provide a storage space for the movement 20. In this embodiment, the cylindrical housing 100 has a cylindrical structure. An annular notch 130 is provided at each of the inner edges of the upper surface and the lower surface of the cylindrical housing 100. A sealing rubber ring 140 is provided in each of the two annular notches 130, which are respectively used to fill the gaps between the cylindrical housing 100 and the transparent housing mirror 400 and between the cylindrical housing 100 and the bottom cover 500 to ensure the airtightness of the inner cavity of the cylindrical housing 100 during the test. In this embodiment, the diameter and thickness of the cylindrical housing 100 can be determined according to the comprehensive value of the sizes of different movements to be tested. The transparent housing mirror 400 is made of transparent glass material or acrylic material to facilitate observing the conditions inside the cylindrical housing 100.
[0023] Twelve test points are evenly spaced in the circumferential direction of the cylindrical housing 100. For example, twelve test points corresponding to the 1-12 o'clock positions on the process dial 50 are provided in the circumferential direction of the cylindrical housing 100, and each stem 120 is fixed to the outer circumferential side of the cylindrical housing 100 and corresponds to a test point. Further, three stems 120 are fixedly spaced on the outer circumferential side of the cylindrical housing 100, and three jacks 150 communicating with the inner cavities of the respective stems 120 are provided on the outer circumferential side of the cylindrical housing 100. The jacks 150 penetrate through the inner and outer walls of the cylindrical housing 100, and the aperture of each jack 150 is the same as the inner diameter of its corresponding stem 120. Preferably, recesses 160 are respectively provided at three test points corresponding to the 1 o'clock, 3 o'clock, and 5 o'clock positions of the process dial on the outer circumferential side of the cylindrical housing 100. A jack 150 penetrating the inner wall of the cylindrical housing 100 is provided on the bottom plane of each recess 160. The stem 120 has a tubular structure, and the outer surface of the stem 120 is a stepped structure. When the stem 120 is inserted into the jack 150, the stepped structure on the stem 120 abuts against the edge of the jack 150 in the recess 160, and at the same time, the stem 120 is in interference fit with the inner wall of the jack 150 to realize the limit installation of the stem 120. Further preferably, the apertures of the three jacks 150 are 1.6 mm, 1.8 mm, and 2.0 mm respectively. In addition, in this embodiment, the watch crown 300 includes a stem rotatably inserted into the stem 120 and a head located outside the stem 120 and fixedly connected to the end of the stem. A non-circular slot is provided at the end of the stem facing away from the head, and the stem core 310 is inserted into the non-circular slot to be in tension fit with the stem, so as to realize the circumferential limit between the stem core 310 and the stem. In this way, by rotating the head, the stem core 310 can be driven to rotate via the stem, thereby adjusting the movement 20.
[0024] In one embodiment, the first fixing mechanism includes a movement fixing piece 600 that elastically abuts against the semi-circular notch 201 at the bottom of the movement 20 to be tested and the lower surface of the movement fixing inner cover 200 respectively, and a movement fixing nail 700 that penetrates through the movement fixing piece 600 and locks onto the movement 20 to be tested. That is to say, in this embodiment, the movement fixing piece 600 is made of an elastic material, which has certain elastic properties and can produce elastic deformation when subjected to an external force. Thus, while achieving the first-stage limit of the movement 20 to be tested through the step 220 on the inner wall of the through hole 210, the second-stage limit between the movement 20 to be tested and the movement fixing inner cover 200 is achieved through the movement fixing piece 600 and the movement fixing nail 700, and at the same time, the elastic cooperation between the two is realized, so as to prevent the impact from being transmitted to the movement 20 when the test shell is subjected to an external impact, thereby ensuring the reliability of the movement 20 test operation.
[0025] In this embodiment, an annular limiting protrusion 170 is fixed on the inner wall of the cylindrical shell 100, and at least one groove 180 is provided on the inner wall of the cylindrical shell 100 below the annular limiting protrusion 170. The upper surface of the movement fixing inner cover 200 is in limiting abutment with the lower surface of the annular limiting protrusion 170. The test shell further includes at least one second fixing mechanism. The second fixing mechanism includes an inner cover fixing piece 800 that is inserted into the groove 180 and elastically abuts against the lower surface of the movement fixing inner cover 200 and the inner wall of the groove 180 respectively, and an inner cover fixing nail 900 that penetrates through the inner cover fixing piece 800 and locks onto the movement fixing inner cover 200. That is to say, the inner cover fixing piece 800 is made of an elastic material, which has certain elastic properties and can produce elastic deformation when subjected to an external force. Thus, while limiting the top of the movement fixing inner cover 200 through the annular limiting protrusion 170, the limit of the bottom of the movement fixing inner cover 200 is achieved through the mutual cooperation of the inner cover fixing piece 800 and the inner cover fixing nail 900, that is, the positioning and installation of the movement fixing inner cover 200 are realized. At the same time, the elastic cooperation between the movement fixing inner cover 200 and the cylindrical shell 100 is also realized, and the shock absorption and buffering of the movement fixing inner cover 200 are achieved through the inner cover fixing piece 800, so as to prevent the impact from being transmitted to the movement fixing inner cover 200 and the movement 20 when the test shell is subjected to an external impact, thereby ensuring the reliability of the movement 20 test operation. In addition, in this embodiment, the movement fixing inner cover 200 and the inner wall of the cylindrical shell 100 are in clearance fit, so that the problem that the cylindrical shell 100 transmits the external impact to the movement fixing inner cover 200 due to the too large rigid contact area between the movement fixing inner cover 200 and the cylindrical shell 100 is reduced, the stability of the movement 20 installation is improved, and the test effect of the movement 20 is ensured.
[0026] In addition, the present utility model also discloses a test method for a differential mechanical movement, which is implemented by using the above-mentioned test shell for a differential mechanical movement. This test method is used to test a differential mechanical movement in a laboratory, and includes the following steps:
[0027] S1. Use CNC to fabricate a cylindrical housing 100, and inlay at least two handle tubes 120 communicating with the inner cavity of the cylindrical housing 100 on the outer circumferential side of the cylindrical housing 100; process an annular notch 130 on the inner edge of the upper surface and the inner edge of the lower surface of the cylindrical housing 100 respectively. In this embodiment, twelve test points corresponding to 1 - 12 o'clock on the process dial 50 are evenly spaced in the circumferential direction of the cylindrical housing 100. Among them, at three test points corresponding to 1 o'clock, 3 o'clock, and 5 o'clock on the outer circumferential side of the cylindrical housing 100, a concave position 160 is respectively opened. On the bottom plane of each concave position 160, a jack 150 penetrating the inner wall of the cylindrical housing 100 is opened. The inner diameters of the three jacks 150 are 1.6 mm, 1.8 mm, and 2.0 mm respectively. Subsequently, a handle tube 120 is inlaid at each of the three jacks 150. The handle tube 120 is in a tension fit with the inner wall of the jack 150, and the inner diameter of the three handle tubes 120 needs to be at least larger than the diameter of the handle core 310 of the movement 20 adapted to it, so as to facilitate the threading of the handle core 310.
[0028] S2. Hermetically cover and install the transparent shell mirror 400 on the top of the cylindrical housing 100. Specifically, the transparent shell mirror 400 is made of transparent glass or acrylic material. The outer contour shape of the transparent shell mirror 400 is adapted to the inner contour shape of the upper opening of the cylindrical housing 100. By installing a sealing rubber ring 140 in the annular notch 130 on the upper part of the cylindrical housing 100, and embedding the transparent shell mirror 400 into the inner ring of the sealing rubber ring 140, and making the transparent shell mirror 400 abut against the bottom surface of the annular notch 130, the sealing rubber ring 140 is jointly extruded by the side surface of the annular notch 130 and the transparent shell mirror 400, so that the sealing rubber ring 140 is deformed, thereby realizing the hermetic installation of the transparent shell mirror 400 on the top of the cylindrical housing 100.
[0029] S3. Use CNC to machine a machine - fixing inner cover 200 adapted to the size of the movement 20 to be tested, and fix the machine - fixing inner cover 200 and the movement 20 to be tested into one body. In step S3, it also includes fixing the process hour hand 30, process minute hand 40, and process dial 50 of the watch on the top of the movement 20. A through - hole 210 penetrating its upper and lower surfaces is opened on the machine - fixing inner cover 200, and a step 220 is opened on the inner wall of the through - hole 210. In this embodiment, the machine - fixing inner cover 200 is fixedly connected to the movement 20 to be tested through a first fixing mechanism. The first fixing mechanism includes a movement fixing piece 600 and a movement fixing nail 700. When the movement 20 is inserted into the through - hole 210 from above the machine - fixing inner cover 200 and is in a limit abutment with the step 220 in the through - hole 210, the movement fixing piece 600 elastically abuts against the semi - circular notch 201 at the bottom of the movement 20 to be tested and the lower surface of the machine - fixing inner cover 200 respectively. The movement fixing nail 700 penetrates the movement fixing piece 600 and is locked on the movement 20 to be tested, realizing the connection between the movement 20 and the machine - fixing inner cover 200 while achieving shock - absorption cooperation between the two.
[0030] S4. Insert the inner fixing cover 200 for fixing the movement 20 to be tested from the bottom of the cylindrical shell 100 into the cylindrical shell 100 and fit it with a clearance to the inner wall of the cylindrical shell 100, and fixedly connect the inner fixing cover 200 to the inner wall of the cylindrical shell 100. Further, an annular limiting protrusion 170 is fixed on the inner wall of the cylindrical shell 100, and at least one groove 180 is provided below the annular limiting protrusion 170 on the inner wall of the cylindrical shell 100. The inner fixing cover 200 is inserted into the cylindrical shell 100 from the bottom of the cylindrical shell 100 and abuts against the lower surface of the annular limiting protrusion 170, and the inner fixing cover 200 is screwed to the inner fixing piece 800 of the inner cover inserted into the groove 180. Specifically, the cylindrical shell 100 can be inverted so that the transparent shell mirror 400 is located at the lower part of the cylindrical shell 100, and the inner fixing cover 200 equipped with the movement 20 is inserted into the inner cavity of the cylindrical shell 100. Then, the inner fixing piece 800 of the inner cover is inserted into the groove 180 and elastically abuts against the lower surface of the inner fixing cover 200 and the inner wall of the groove 180 respectively. The inner fixing nail 900 is passed through the inner fixing piece 800 of the inner cover and locked on the inner fixing cover 200. While installing the inner fixing cover 200 in the cylindrical shell 100, the elastic cooperation between the inner fixing cover 200 and the cylindrical shell 100 is realized to achieve shock absorption protection for the inner fixing cover 200 and the movement 20. In this embodiment, a threaded hole is provided at the bottom of the inner fixing cover 200, and the inner fixing nail 900 passes through the inner fixing piece 800 of the inner cover and is inserted into the threaded hole to be threadedly connected to the inner fixing cover 200.
[0031] S5. Sealingly cover and install the bottom cover 500 at the bottom of the cylindrical shell 100, pass the stem core 310 with the stem 300 through a stem tube 120 and connect it to the movement 20 inside the cylindrical shell 100, and test the movement 20. Specifically, a sealing rubber ring 140 is embedded in the annular notch 130 at the lower part of the cylindrical shell 100, and the bottom cover 500 is embedded in the inner ring of the sealing rubber ring 140 so that the bottom cover 500 abuts against the top surface of the annular notch 130 at the lower part of the cylindrical shell 100. The side surface of the annular notch 130 and the bottom cover 500 jointly squeeze the sealing rubber ring 140, causing the sealing rubber ring 140 to deform, thereby realizing the sealing installation of the bottom cover 500 at the bottom of the cylindrical shell 100. In this embodiment, the bottom cover 500 includes a bottom ring that is sealingly fitted with the cylindrical shell 100 and a transparent glass that is sealingly embedded in the middle of the bottom ring for observing the bottom of the movement 20 during testing. Subsequently, the stem core 310 with a diameter of 0.9 mm and the stem 300 is passed through the stem tube 120 at the 3 o'clock position and connected to the movement 20 inside the cylindrical shell 100, thereby realizing the installation of the movement 20 in the test case. After the movement 20 is installed in the test case, it can be tested according to the standard process of a mechanical watch movement. For example, performance indicators such as the running time error, continuous running time, and shock resistance reliability of the movement 20 are tested, which will not be elaborated here.
[0032] Implementing the test case 10 and test method for a differential mechanical movement of the present utility model, by designing a test case to replace the watch case for encapsulation, losses caused by damage to the watch case during the test can be avoided; when testing multiple differential mechanical movements 20, an appropriate-sized internal movement holder 200 can be selectively selected and installed in the cylindrical housing 100 to achieve the installation of the corresponding movement 20 to be tested in the test case, so as to test each movement 20. While protecting the movement 20 through sealed encapsulation of the test case and preventing the movement 20 from being contaminated by dust, the testing of multiple movements 20 can be achieved with one test case, reducing the number of test cases used and lowering the testing cost of the watch.
[0033] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.
[0034] The above-described embodiments merely represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.
Claims
1. A test case for a differential mechanical movement, characterized in that, Comprising: A cylindrical housing, the inner cavity of the cylindrical housing forms a test space, the top of the cylindrical housing is sealed with a transparent housing mirror, the bottom of the cylindrical housing is sealed with a bottom cover, and at least two handle tubes are fixedly spaced on the outer ring side surface of the cylindrical housing. The inner cavity of the handle tube is communicated with the test space, and the inner diameters of the respective handle tubes are different; At least two fixing machine inner covers, the at least two fixing machine inner covers are alternatively received in the test space, and the fixing machine inner cover is detachably connected to the inner wall of the cylindrical housing. A through hole is provided in the middle of the fixing machine inner cover for receiving the movement to be tested, penetrating the upper and lower surfaces of the fixing machine inner cover, and the through hole diameters of the respective fixing machine inner covers are different. A step for supporting the movement to be tested is provided on the inner wall of the through hole. A through connection groove or a through connection hole is provided on the lower surface of the fixing machine inner cover, penetrating the inner and outer side walls of the fixing machine inner cover and communicating with the through hole and the inner cavity of the handle tube respectively; A first fixing mechanism, the first fixing mechanism is located in the test space and is detachably connected to the movement to be tested received in the through hole, and the first fixing mechanism is elastically matched with the fixing machine inner cover; and A watch stem, the watch stem is rotatably inserted into one of the handle tubes, a handle core is fixed at the end of the watch stem, and the handle core penetrates the handle tube and is drivingly connected to the movement to be tested.
2. The test case for a differential mechanical movement according to claim 1, characterized in that, Twelve test points are evenly spaced in the circumferential direction of the cylindrical housing, and each handle tube is fixed on the outer ring side surface of the cylindrical housing and corresponds to one test point.
3. The test case for a differential mechanical movement according to claim 2, characterized in that, Three handle tubes are fixedly spaced on the outer ring side surface of the cylindrical housing, and three jacks corresponding to and communicating with the inner cavities of the respective handle tubes are provided on the outer ring side surface of the cylindrical housing. The jacks penetrate the inner and outer side walls of the cylindrical housing, and the aperture of each jack is the same as the inner diameter of the corresponding handle tube.
4. The test case for differentiating mechanical movements according to claim 3, characterized in that, A concave position is respectively provided at three test points on the outer ring side surface of the cylindrical housing corresponding to the 1 o'clock, 3 o'clock, and 5 o'clock of the process dial, and a through hole penetrating the inner wall of the cylindrical housing is provided on the bottom plane of each concave position.
5. The test case for differentiating mechanical movements according to claim 3, characterized in that, The apertures of the three jacks are 1.6 mm, 1.8 mm, and 2.0 mm respectively.
6. The test case for differentiating mechanical movements according to claim 1, characterized in that, The first fixing mechanism includes a movement fixing piece that elastically abuts against the semicircular notch at the bottom of the movement to be tested and the lower surface of the fixing machine inner cover respectively, and a movement fixing nail that penetrates the movement fixing piece and is locked on the movement to be tested.
7. The test case for differentiating mechanical movements according to claim 1, characterized in that, An annular limiting protrusion is fixed on the inner wall of the cylindrical housing, and at least one groove is provided on the inner wall of the cylindrical housing below the annular limiting protrusion. The upper surface of the fixing machine inner cover is in limiting abutment with the lower surface of the annular limiting protrusion; the test housing further includes at least one second fixing mechanism, and the second fixing mechanism includes an inner cover fixing piece that is inserted into the groove and elastically abuts against the lower surface of the fixing machine inner cover and the inner wall of the groove respectively, and an inner cover fixing nail that penetrates the inner cover fixing piece and is locked on the fixing machine inner cover.
8. The test case for differentiating mechanical movements according to claim 1, characterized in that, The fixing machine inner cover is in clearance fit with the inner wall of the cylindrical housing.
9. The test case for differentiating mechanical movements according to claim 1, characterized in that, An annular notch is provided at the inner edge of the upper surface and the inner edge of the lower surface of the cylindrical housing respectively, and a sealing rubber ring is provided in each of the two annular notches.