Positioning device for assisting in sequential assembly of multiple gears

Abstract

The invention relates to the technical field of folding screen hinge gear assembly, and discloses a positioning device for assisting in sequential assembly of multiple gears, which comprises a first jig, a second jig, an electric lead screw mechanism, a position sensor and a control unit, the second jig is provided with two profiling through holes, the contours of the radial sections of the two profiling through holes can be meshed, the positions of the two gears are defined in advance through the two profiling through holes, and the two gears are located at the relative positions where the two gears can be meshed with each other. A control unit is adopted to control an electric lead screw mechanism to drive a first jig to move accurately, and a position sensor is matched for auxiliary positioning, so that one profiling through hole is located over a corresponding assembly hole of a gear seat; and then the to-be-assembled gear in one profiling through hole is pressed downwards in the corresponding assembling hole of the gear seat through a manual or automatic mechanism, the operation is repeated, the gear in the other profiling through hole is pressed in the other corresponding assembling hole of the gear seat, and the assembling process is simple and convenient.

Description

Technical Field

[0001] This invention relates to the field of hinge gear assembly technology for folding screens, and more particularly to a positioning device for assisting in the sequential assembly of multiple gears. Background Technology

[0002] Foldable phones, with their foldable and unfoldable screens, satisfy users' needs for both a large screen and portability. Based on these advantages, foldable phones have become increasingly popular in recent years. The folding hinge is a crucial component that enables the screen to fold and unfold, and its performance and reliability directly impact the user experience.

[0003] Currently, the main components of a common folding screen hinge include a main shaft, two wing plates, a gear seat, and a gear set. The two wing plates are rotatably connected to the main shaft; the gear seat is located on the main shaft and has multiple mounting holes for assembling the gear set. The two wing plates are linked together through the gear set. Due to the small size of the gear set and gear seat, the high precision requirements for assembly, and the need for meshing between gears during assembly, the gear set assembly process is quite difficult.

[0004] To address the technical challenge of assembling miniature gear sets, patent document CN117549033B discloses a multi-gear pressing device. This device includes a moving mechanism, a rotary gripping mechanism for grasping and rotating gears, a pin mechanism for pushing gears away from the rotary gripping mechanism, a fixture for mounting gear seats, and a guide plate for guiding gears to the fixture. The rotary gripping mechanism and the pin mechanism are located at the output end of the moving mechanism. The guide plate is connected to the fixture and has guide holes. The moving mechanism drives the rotary gripping mechanism and the pin mechanism to move downwards synchronously, allowing the rotary gripping mechanism to pass the gear through the guide holes and press it onto the gear seat supported by the fixture. During the downward movement, the rotary gripping mechanism rotates the gear, causing it to contact other gears already assembled on the gear seat until the teeth of the gear mesh with the other gears, completing the gear assembly. When the moving mechanism drives the rotary gripping mechanism upwards, the pin mechanism pushes the gear away from the rotary gripping mechanism, preventing the gear from rising along with the rotary gripping mechanism. This method solves the problem of difficult assembly of adjacent gears.

[0005] However, although the aforementioned solution can solve the technical problem of difficult gear assembly to some extent, the solution adopts the technical means of rotating the gear simultaneously during the pressing process to complete the meshing of the gear with the gear already assembled on the gear seat. The process control is relatively complex and difficult, and the assembly difficulty is still high.

[0006] Therefore, how to provide a simpler multi-gear assembly technology has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, the present invention provides a positioning device for assisting the sequential assembly of multiple gears, which can assist the sequential assembly of multiple gears and reduce the assembly difficulty.

[0008] This invention is achieved using the following technical solution: A positioning device for assisting in the sequential assembly of multiple gears includes at least a first fixture, a second fixture, an electric lead screw mechanism, a position sensor, and a control unit. The first fixture is used to mount a gear seat and define its position. The second fixture is located above the first fixture and is slidably mounted on it along a first direction. The second fixture has at least two contoured through holes spaced apart along the first direction. Each contoured through hole penetrates the top and bottom sides of the second fixture, and the radial cross-sectional profiles of the two contoured through holes are adapted to the tooth profile shape of the gear to be assembled. When the radial cross-sectional profiles of the two contoured through holes are aligned along the first direction... When connected, the radial cross-sections of the two contoured through holes can mesh; the electric lead screw mechanism is located on the first fixture and is used to drive the second fixture to slide back and forth relative to the first fixture, so that the two contoured through holes move sequentially to directly above the corresponding mounting holes of the gear seat; the position sensor includes a light-emitting element and a light-receiving element, one of which is located on the second fixture and the other is located on the first fixture. When the light-receiving element and the light-emitting element are facing each other, the light-receiving element receives the light emitted by the light-emitting element and generates a sensing signal; the control unit can control the electric lead screw mechanism to stop moving or continue moving a preset distance after receiving the sensing signal from the light-emitting element.

[0009] In one alternative embodiment, the second fixture includes a base and a support plate; the base is slidably connected to the first fixture, and the support plate is detachably disposed on the base; a contoured through hole is formed in the support plate.

[0010] In one optional embodiment, the top surface of the base is provided with at least two positioning posts extending upward from the top surface of the base, and the support plate is provided with at least two positioning holes, with the two positioning holes and the two positioning posts being inserted one by one in correspondence.

[0011] In one alternative embodiment, the base has a hollowed-out clearance window, and the position of the contoured through hole corresponds to the position of the clearance window.

[0012] In one optional embodiment, the first fixture includes a base; the top surface of the base has two symmetrically arranged sliding grooves that extend along a first direction, and the bottom surface of the base has two protruding sliders that are respectively disposed in the two sliding grooves.

[0013] In an optional embodiment, the first fixture further includes a fixture plate, which is fixed to the top surface of the base and located between the two slides; the top surface of the fixture plate has at least one loading groove for loading the gear seat and defining the position of the gear seat.

[0014] In one alternative embodiment, the light-emitting element is disposed on the slider, and the light-receiving element is disposed on the fixture plate.

[0015] In one optional embodiment, the electric lead screw mechanism includes a lead screw motor, a lead screw shaft, and an internal threaded sleeve; the lead screw motor is fixedly connected to one end of the base, the lead screw shaft is fixedly connected to the rotating shaft of the lead screw motor, the internal threaded sleeve is sleeved on the lead screw shaft and threadedly connected to the lead screw shaft; the internal threaded sleeve is the output end of the electric lead screw mechanism; the base is fixedly connected to the internal threaded sleeve.

[0016] In one optional embodiment, the first fixture includes a first end and a second end arranged sequentially along a first direction, and a light-receiving element is disposed at the second end; the second fixture includes a third end and a fourth end arranged sequentially along the first direction; a light-emitting element is disposed at the fourth end, and a contoured through hole is closer to the third end than the light-emitting element.

[0017] In one alternative embodiment, the light-emitting element is embedded in the second fixture, and the light-receiving element is embedded in the first fixture.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The radial cross-sectional contours of the two contoured through holes on the second fixture of this application can mesh, pre-defining the positions of the two gears so that they are in a relative position capable of meshing. During the assembly of the two gears, a control unit controls an electric lead screw mechanism to drive the second fixture to move precisely, and a position sensor assists in positioning, so that one of the contoured through holes of the second fixture is directly above the corresponding assembly hole of the gear seat. Then, a manual or automated mechanism presses the gear to be assembled in the contoured through hole down into the corresponding assembly hole of the gear seat. The above operation is repeated to press the gear in the other contoured through hole down into the other corresponding assembly hole of the gear seat. Because the two gears are in a relative position capable of meshing, and the teeth of the two gears are staggered, the two gears will not collide during the pressing process, and it will not affect the pressing process. When both gears are assembled in the gear seat, the two gears are also in a meshing state. Compared with the prior art, the solution of this application can accurately position the gears, so that there is no need to rotate the gears to make one gear mesh with another during the gear assembly process, making the assembly process simpler and reducing the assembly difficulty. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a gear holder and gear assembly in the prior art. Figure 2 This is a schematic diagram of the positioning device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the second fixture according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the support plate according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the radial cross-sectional profile of the two contoured through holes according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the combined structure of the first fixture and gear seat according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the assembly of the gear and gear seat according to an embodiment of the present invention.

[0020] The image is labeled as follows: 10. First fixture; 11. Base; 111. Chute; 12. Fixture plate; 13. First end; 14. Second end; 20. Second fixture; 21. Support plate; 211. Contour through hole; 22. Base; 221. Slider; 222. Positioning post; 223. Clearance window; 23. Third end; 24. Fourth end; 30. Electric lead screw mechanism; 61. Light-emitting component; 62. Light-receiving component; 80. Gear seat; 81. Assembly hole; 82. Outer gear; 83. Gear. Detailed Implementation

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0022] This embodiment discloses a positioning device for assisting in the sequential assembly of multiple gears. It is used to accurately position multiple gears so that at least two gears can be sequentially assembled onto a gear holder. For example, please refer to... Figure 1 and Figure 6 Taking the gear seat 80, which is common in the folding screen hinge industry, as an example, the gear seat 80 includes at least two mounting holes 81 for inserting the shafts of the gears 83. The shafts of the two gears 83 are inserted into the mounting holes 81, so that the two gears 83 mesh with each other and each gear 83 meshes with the two outer gears 82 respectively. This completes the operation of assembling the gears 83.

[0023] Please see Figures 2 to 7This embodiment discloses a positioning device for assisting in the sequential assembly of multiple gears, comprising a first fixture 10, a second fixture 20, an electric lead screw mechanism 30, a position sensor, and a control unit (not shown in the figure). The control unit can be a PLC controller; however, it can also be a controller commonly used in the automation industry. No limitation is made on the type of control unit here. In this embodiment, the control unit is electrically connected to the electric lead screw mechanism 30 and the position sensor via a signal transmission line, thereby controlling the operation of the electric lead screw mechanism 30 and receiving signals from the position sensor.

[0024] The first fixture 10 is used to mount the gear seat 80 and define the position of the gear seat 80 so that the gear 83 can be subsequently mounted on the gear seat 80.

[0025] The second fixture 20 is located above the first fixture 10 and can slide back and forth along the first direction F. The second fixture 20 has at least two contoured through holes 211 spaced apart along the first direction F. Each contoured through hole 211 penetrates the top and bottom sides of the second fixture 20, and the radial profile of the two contoured through holes 211 matches the tooth profile of the gear 83 to be assembled. When the radial profiles of the two contoured through holes 211 meet in the first direction F, the radial profiles of the two contoured through holes 211 can mesh (e.g., ...). Figure 5 (As shown).

[0026] The electric lead screw mechanism 30 is provided on the first fixture 10 and is used to drive the second fixture 20 to slide back and forth relative to the first fixture 10 so that the two contoured through holes 211 move sequentially to the top of the corresponding assembly holes 81 of the gear seat 80, so that the gears 83 to be assembled in the two contoured through holes 211 can be sequentially assembled into the corresponding two assembly holes 81 of the gear seat 80.

[0027] The position sensor includes a light-emitting element 61 and a light-receiving element 62. One of the light-emitting element 61 and the light-receiving element 62 is disposed in the second fixture 20 and the other is disposed in the first fixture 10. When the light-receiving element 62 is facing the light-emitting element 61, the light-receiving element 62 receives the light emitted by the light-emitting element 61 and generates a sensing signal.

[0028] Next, the working process of the positioning device used to assist in the sequential assembly of multiple gears in this embodiment will be described in conjunction with the application scenario.

[0029] In some application scenarios, please combine Figure 1The gear seat 80 includes four mounting holes 81 for inserting the shafts of gears 83. Two outer gears 82 are pre-assembled into the mounting holes 81 on both sides of the gear seat 80 using manual labor, a robotic arm, or other suitable automated equipment. Two wing plates are also pre-assembled into both sides of the gear seat 80. The rotating shafts of the outer gears 82 are irregularly shaped shafts. The rotating shafts of the two outer gears 82 are respectively inserted into the irregularly shaped holes of the two wing plates of the folding screen hinge, allowing the two wing plates and the rotating shafts of the two outer gears 82 to rotate synchronously. The gear seat 80, the two wing plates, and the two outer gears 82 together constitute a semi-finished hinge. The positioning device in this embodiment, used to assist in the sequential assembly of multiple gears, is used to press two gears 83 sequentially into the two middle mounting holes 81 of the aforementioned gear seat 80. The assembly process includes: S1. Mount the gear seat 80 onto the first fixture 10: Initially, the first fixture 10 and the second fixture 20 are staggered. The aforementioned hinge semi-finished product is pre-loaded onto the first fixture 10. The first fixture 10 is provided with at least one loading groove, which is a contour groove that can define the position of the gear seat 80 and the position of the two wing plates. After the position of the two wing plates is defined, the position of the two outer gears 82 is also defined. When the position of the two outer gears 82 is defined, the relative position of the two intermediate gears 83 that mesh with the two outer gears 82 is also specific. The two contour through holes 211 on the second fixture 20 can define the two gears 83 to be assembled in a specific relative position. The two gears 83 to be assembled are assembled on the gear seat 80 while maintaining this specific relative position, and the two gears 83 can then mesh with the two outer gears 82 respectively.

[0030] S2. Insert gear 83 into the second fixture 20: The two gears 83 are coated with oil, and then inserted manually, by a robotic arm, or using other automated equipment, into the two contoured through holes 211 of the second fixture 20. The contoured through holes 211 are adapted to the tooth profile of the gears 83, allowing the gears 83 to have a sufficiently large area to adhere to the inner wall of the contoured through holes 211 through the grease. The two gears 83 of the folding screen hinge are small and lightweight; therefore, the adhesiveness of the grease is sufficient to overcome the weight of the two gears 83, thus adhering them to the two contoured through holes 211. Unless subjected to violent impact or prolonged inactivity, the gears 83 will not detach from the contoured through holes 211 on their own. This operation completes both the oiling process for the gears 83 and the adhesion of the gears 83 to the contoured through holes 211, facilitating subsequent pressing operations.

[0031] S3. Adjust the relative positions of the first fixture 10 and the second fixture 20: A control unit controls an electric lead screw mechanism 30 to drive the second fixture 20 forward relative to the first fixture 10 along the first direction F. When the light-emitting element 61 aligns with the light-receiving element 62, the light-receiving element 62 receives the light emitted by the light-emitting element 61 and generates a sensing signal. The light-receiving element 62 feeds this sensing signal back to the control unit, which then controls the electric lead screw mechanism 30 to drive the second fixture 20 to continue moving forward slowly for a preset stroke, so that one of the contoured through holes 211 is located directly above one of the mounting holes 81 of the gear seat 80, thereby ensuring that the shaft of the gear 83 inside the contoured through hole 211 is aligned with the mounting hole 81. The stroke of the second fixture 20 is controlled by the electric lead screw mechanism 30. The control unit provides the electric lead screw mechanism 30 with corresponding signal data, enabling the electric lead screw mechanism 30 to drive the second fixture 20 to move forward precisely for a preset stroke. After the second fixture 20 moves for the preset stroke, the contoured through hole 211 is aligned vertically with the mounting hole 81.

[0032] S4, Press-fitted Gear 83: The gear 83 to be assembled is pressed down into the contoured through-hole 211 using a manual operating tool or an automated mechanism, causing the gear 83 to move downwards. Guided by the contoured through-hole 211, the shaft of the gear 83 is inserted into the corresponding assembly hole 81 of the gear seat 80. Since the contoured through-hole 211 has positioned the gear 83 to be assembled in a position where it can mesh with the corresponding outer gear 82 already assembled on the gear seat 80, the teeth of the gear 83 and the corresponding outer gear 82 are misaligned. During the downward movement of the gear 83, there will be no tooth collision between the gear 83 and the corresponding outer gear 82. After the gear 83 moves to the preset position, it is assembled onto the gear seat 80 and is in a meshing state with the outer gear 82.

[0033] S5. The control unit controls the electric lead screw mechanism 30 to drive the second fixture 20 to continue to move forward slowly by another preset stroke, so that another contoured through hole 211 of the second fixture 20 moves directly above the corresponding other mounting hole 81 of the gear seat 80. Then, the S4 step is repeated so that the gear 83 in the other contoured through hole 211 is also mounted on the gear seat 80.

[0034] In summary, this embodiment can predefine the relative positions of the two gears 83 before assembling the gear 83, so that the two gears 83, when assembled on the gear seat 80 according to the relative positions, can mesh with other gears 83 already assembled on the gear seat 80, and the two gears 83 can also mesh with each other. Compared with the prior art, this embodiment can avoid the action of rotating the gear 83 to make the gear 83 mesh with another gear 83 during the assembly process, simplifying the assembly process, reducing the assembly difficulty, and improving assembly efficiency and assembly quality.

[0035] Next, the structure of this embodiment will be further described.

[0036] Please combine Figures 2 to 4 In some embodiments, the second fixture 20 includes a base 22 and a support plate 21; the base 22 is slidably connected to the first fixture 10, and the support plate 21 is detachably disposed on the base 22. A contoured through hole 211 is formed in the support plate 21 and extends through the top and bottom sides of the support plate 21. In some application scenarios, the operator pre-inserts the gears 83 to be assembled into the contoured through holes 211 of multiple support plates 21, and then assembles the support plates 21 onto the base 22. After the gears 83 carried on the support plates 21 are assembled, the support plates 21 are removed and replaced with another support plate 21 to continue assembling the gears 83, reducing downtime and improving work efficiency.

[0037] Furthermore, the size of the through-hole 211 is slightly larger than the size of the gear 83 to be assembled. When the gear 83 is inserted into the through-hole 211, there is a small gap between the gear 83 and the inner wall of the through-hole 211. Regarding the design of this gap, on the one hand, it must ensure that grease can adhere the gear 83 to the through-hole 211 when it is inserted; on the other hand, when the teeth of the gear 83 to be assembled are not completely misaligned with the teeth of the gear 83 already assembled on the gear seat 80, it must ensure that the gear 83 to be assembled can adaptively deflect slightly within the through-hole 211, so that the gear 83 to be assembled and the gear 83 already assembled on the gear seat 80 can mesh smoothly. Preferably, this gap can be 0.03mm-0.1mm.

[0038] Furthermore, to facilitate the disassembly and assembly of the support plate 21, the following solution can be adopted: The top surface of the base 22 is provided with at least two positioning posts 222 extending upwards from the top surface of the base 22, and the support plate 21 has at least two positioning holes, with each positioning hole corresponding to one of the positioning posts 222. This solution, on the one hand, uses the positioning posts 222 to constrain the support plate 21 to the top surface of the base 22; on the other hand, it also facilitates the removal of the support plate 21 from the base 22.

[0039] Furthermore, the base 22 has a hollowed-out clearance window 223, and the position of the contoured through hole 211 corresponds to the position of the clearance window 223. The clearance window 223 allows the gear 83 to be assembled to pass through so that the gear 83 to be assembled can be press-fitted into the assembly hole 81 of the gear seat 80.

[0040] Please combine Figure 2 and Figure 6In some embodiments, the first fixture 10 includes a base 11, the top surface of which is provided with two symmetrically arranged sliding grooves 111, the sliding grooves 111 extending along a first direction F, the bottom surface of the base 22 is provided with two sliders 221, the two sliders 221 are respectively arranged in the two sliding grooves 111, and the base 22 is slidably connected to the base 11 through the two sliders 221.

[0041] Furthermore, the first fixture 10 also includes a fixture plate 12, which is fixed to the top surface of the base 11 and located between the two sliding grooves 111; a loading groove is formed on the top surface of the fixture plate 12. This structure allows the first fixture 10 and the second fixture 20 to fit together more compactly, reducing the overall volume.

[0042] In some embodiments, the electric lead screw mechanism 30 includes a lead screw motor, a lead screw shaft, and an internal threaded sleeve. The lead screw motor is fixed to one end of the base 11 by fasteners. The lead screw shaft is fixed to the rotating shaft of the lead screw motor. Specifically, the top surface of the base 11 is provided with two support seats, and both ends of the lead screw shaft are rotatably mounted on the support seats by bearings. The end of the lead screw shaft near the lead screw motor is coaxially connected to the rotating shaft of the lead screw motor by a coupling. The internal threaded sleeve is sleeved on the lead screw shaft and threadedly connected to the lead screw shaft; the base 22 is fixed to the internal threaded sleeve. When the lead screw shaft rotates in both directions, it can drive the internal threaded sleeve to reciprocate along the axial direction of the lead screw shaft, thereby driving the base 22 to reciprocate along the axial direction of the lead screw shaft, and the base 22 drives the bearing plate 21 to move. The electric lead screw mechanism 30 can precisely drive the base 22 and the support plate 21 to reciprocate a preset distance in the first direction F according to the instructions issued by the control unit, thereby achieving precise alignment between the contoured through hole 211 on the support plate 21 and the corresponding mounting hole 81 of the gear seat 80, so that the gear 83 in the contoured through hole 211 can be precisely pressed into the corresponding mounting hole 81 in the subsequent process.

[0043] In some embodiments, the light-emitting element 61 is embedded in the second fixture 20, and the light-receiving element 62 is embedded in the first fixture. Preferably, the light-emitting element 61 is disposed on the slider 221, and the light-receiving element 62 is disposed on the fixture plate 12.

[0044] Furthermore, the first fixture 10 includes a first end 13 and a second end 14 arranged sequentially along the first direction, and the light-receiving element 62 is disposed at the second end 14; the second fixture 20 includes a third end 23 and a fourth end 24 arranged sequentially along the first direction; the light-emitting element 61 is disposed at the fourth end 24, and the contoured through hole 211 is closer to the third end 23 than the light-emitting element 61.

[0045] In some application scenarios, the principle of position sensor-assisted positioning includes: during the assembly of the first gear 83 to be assembled, the electric lead screw mechanism 30 drives the second fixture 20 to move. When the light-emitting element 61 aligns with the light-receiving element 62, the light-receiving element 62 receives the light emitted by the light-emitting element 61, indicating that the second fixture 20 has moved to a preset position. The light-receiving element 62 then sends a corresponding signal to the control unit. After receiving the corresponding signal, the control unit controls the electric lead screw mechanism 30 to drive the second fixture 20 to slowly move a preset stroke. After the set stroke, the corresponding mounting hole 81 of the gear seat 80 and the corresponding contoured through hole 211 of the second fixture 20 are perfectly aligned. In this way, the electric lead screw mechanism 30 can quickly move the second fixture 20 before the light receiver 62 sends a feedback signal to the control unit, improving positioning efficiency. After the light receiver 62 sends a feedback signal to the control unit, the second fixture 20 is moved slowly, allowing for precise control of its position and ensuring accurate alignment between the contoured through hole 211 of the second fixture 20 and the corresponding mounting hole 81 of the gear seat 80. When another gear 83 needs to be assembled, the control unit controls the electric lead screw mechanism 30 to drive the second fixture 20 to continue moving a specific distance according to the set stroke, thus aligning the other contoured through hole 211 of the second fixture 20 with the other mounting hole 81 of the gear seat 80. In some other embodiments, after receiving the corresponding signal, the control unit controls the electric lead screw mechanism 30 to stop driving the second fixture 20. At this time, the corresponding contoured through hole 211 of the second fixture 20 is aligned with the corresponding mounting hole 81 of the gear seat 80, that is, the corresponding contoured through hole 211 is located directly above the corresponding mounting hole 81.

[0046] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A positioning device for assisting in the sequential assembly of multiple gears, characterized in that, At least including: The first fixture (10) is used to mount the gear seat (80) and define the position of the gear seat (80); The second fixture (20) is located above the first fixture (10) and can slide back and forth along the first direction. The second fixture (20) has at least two contoured through holes (211) arranged at intervals along the first direction. The contours of the radial sections of the two contoured through holes (211) are adapted to the tooth profile of the gear (83) to be assembled. When the contours of the radial sections of the two contoured through holes (211) are connected in the first direction, the contours of the radial sections of the two contoured through holes (211) can mesh. An electric lead screw mechanism (30) is provided on the first fixture (10) to drive the second fixture (20) to slide back and forth relative to the first fixture (10) so that the two contoured through holes (211) move sequentially to directly above the corresponding mounting holes (81) of the gear seat (80); A position sensor includes a light-emitting element (61) and a light-receiving element (62). One of the light-emitting element (61) and the light-receiving element (62) is disposed in the second fixture (20), and the other is disposed in the first fixture (10). When the light-receiving element (62) is facing the light-emitting element (61), the light-receiving element (62) receives the light emitted by the light-emitting element (61) and generates a sensing signal. The control unit is able to control the electric lead screw mechanism (30) to stop moving or continue moving a preset distance after receiving the sensing signal from the light-emitting element (61).

2. The positioning device for assisting in the sequential assembly of multiple gears as described in claim 1, characterized in that, The second fixture (20) includes a base (22) and a support plate (21); the base (22) is slidably connected to the first fixture (10), and the support plate (21) is detachably disposed on the base (22); the contoured through hole (211) is opened on the support plate (21) and penetrates the top and bottom sides of the support plate (21).

3. The positioning device for assisting in the sequential assembly of multiple gears as described in claim 2, characterized in that, The base (22) has at least two positioning posts (222) extending upward from the top surface of the base (22), and the bearing plate (21) has at least two positioning holes, and the two positioning holes are inserted into the two positioning posts (222) one by one.

4. The positioning device for assisting in the sequential assembly of multiple gears as described in claim 2, characterized in that, The base (22) has a hollowed-out clearance window (223), and the position of the contoured through hole (211) corresponds to the position of the clearance window (223).

5. The positioning device for assisting in the sequential assembly of multiple gears as described in claim 2, characterized in that, The first fixture (10) includes a base (11), and the top surface of the base (11) is provided with two symmetrically arranged sliding grooves (111), which extend along the first direction; the bottom surface of the base (22) is provided with two sliders (221), and the two sliders (221) are respectively arranged in the two sliding grooves (111).

6. The positioning device for assisting in the sequential assembly of multiple gears as described in claim 5, characterized in that, The first fixture (10) further includes a fixture plate (12), which is fixed to the top surface of the base (11) and located between the two slides (111); the top surface of the fixture plate (12) has at least one loading groove for loading the gear seat (80) and defining the position of the gear seat (80).

7. The positioning device for assisting in the sequential assembly of multiple gears as described in claim 6, characterized in that, The light-emitting element (61) is disposed on the slider (221), and the light-receiving element (62) is disposed on the fixture plate (12).

8. The positioning device for assisting in the sequential assembly of multiple gears as described in claim 5, characterized in that, The electric lead screw mechanism (30) includes a lead screw motor, a lead screw shaft, and an internal threaded sleeve; the lead screw motor is fixedly connected to one end of the base (11), the lead screw shaft is fixedly connected to the rotating shaft of the lead screw motor, the internal threaded sleeve is sleeved on the lead screw shaft and threadedly connected to the lead screw shaft; the internal threaded sleeve is the output end of the electric lead screw mechanism (30); the base (22) is fixedly connected to the internal threaded sleeve.

9. The positioning device for assisting in the sequential assembly of multiple gears as described in any one of claims 1-8, characterized in that, The first fixture (10) includes a first end (13) and a second end (14) arranged sequentially along the first direction, and the light receiving element (62) is disposed at the second end (14); the second fixture (20) includes a third end (23) and a fourth end (24) arranged sequentially along the first direction; the light emitting element (61) is disposed at the fourth end (24), and the contoured through hole (211) is closer to the third end (23) than the light emitting element (61).

10. The positioning device for assisting in the sequential assembly of multiple gears as described in any one of claims 1-8, characterized in that, The light-emitting element (61) is embedded in the second fixture (20), and the light-receiving element (62) is embedded in the first fixture (10).

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