Motor rotation positioning mechanism and endoscope system

Abstract

The utility model provides a motor rotation positioning mechanism and an endoscope system, and relates to the technical field of medical instruments. The motor rotation positioning mechanism comprises a driving shaft, a positioning piece and a guide rail. The positioning piece is provided with an insertion end. A spiral groove is formed in the middle of the driving shaft; the driving shaft is connected with a main shaft of the motor; the two ends of the driving shaft are provided with limiting ends respectively, the positioning piece is located between the pair of limiting ends, and the limiting ends are located on the moving path of the positioning piece. The insertion end is at least partially located in the spiral groove, and the insertion end is in sliding fit with the spiral groove; the guide rail is connected with the positioning piece and extends in the axial direction of the driving shaft. The motor rotation positioning mechanism provided by the utility model can realize accurate in-place stop of the motor, and the twisting reliability of the steel wire is improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a motor rotation positioning mechanism and an endoscope system. Background Art

[0002] During observation, diagnosis, and treatment, it is clinically necessary to magnify or reduce the lesion site, and during this process, the position of the movable lens in the objective lens module needs to be adjusted. In the endoscope system, the motor drives the drive shaft to rotate to achieve the movement of the movable lens in the objective lens module. When the motor rotates, the twisting of the steel wire of the endoscope system generates resistance, causing the motor to stall. Because the twisting resistance of the steel wire cannot be controlled, it is impossible to accurately control the motor to stop in place. In addition, the torque required due to the motor stall is relatively large, and after long-term use, the reliability of the steel wire torsion performance is reduced. Utility Model Content

[0003] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a motor rotation positioning mechanism and an endoscope system that can achieve accurate stopping of the motor and extend the reliability of wire torsion.

[0004] This application provides the following technical solutions:

[0005] In a first aspect, an embodiment of the present application provides a motor rotation positioning mechanism, the motor rotation positioning mechanism comprising:

[0006] a positioning member having an insertion end;

[0007] A drive shaft having a spiral groove in the middle thereof and connected to the main shaft of the motor; each end of the drive shaft has a limit end, the positioning member is located between a pair of the limit ends, and the limit ends are located on the movement path of the positioning member; wherein the insertion end is at least partially located in the spiral groove, and the insertion end and the spiral groove are in sliding engagement;

[0008] A guide rail is connected to the positioning member, and the guide rail is extended along the axial direction of the drive shaft.

[0009] In one embodiment of the first aspect, the limiting ends are respectively provided at both ends of the spiral groove, and the limiting ends are connected to the groove wall of the spiral groove.

[0010] In one embodiment of the first aspect, the positioning member includes:

[0011] A slider, the slider having a slideway, the drive shaft passing through the slideway;

[0012] The guide part is detachably connected to the sliding block, the guide part is partially located in the spiral groove, and the guide part and the spiral groove are slidably matched.

[0013] In one embodiment of the first aspect, the guide portion includes:

[0014] A pin shaft, one side of the slider has a pin hole, the pin hole passes through the inner wall of the slideway, the pin shaft is passed through and fixed in the pin hole, and one end of the pin shaft located in the slideway is in sliding fit with the spiral groove.

[0015] In one embodiment of the first aspect, the slideway and the drive shaft are clearance-fitted, and the end portions at both ends of the spiral groove respectively form the limiting ends.

[0016] In one embodiment of the first aspect, the motor rotation positioning mechanism further includes:

[0017] A motor seat is connected to the motor and the guide rail respectively, and the drive shaft is rotatably connected to the motor seat.

[0018] In one of the embodiments of the first aspect, the guide rail includes a guide plate, the guide plate is connected to the motor base, the guide plate and the motor base are surrounded by a slide groove, the slide groove is extended along the axial direction of the drive shaft, and the positioning member and the slide groove are slidably matched.

[0019] In one embodiment of the first aspect, the guide plate and / or the motor base has a weight-reducing hole.

[0020] In one embodiment of the first aspect, the drive shaft has a pair of positioning shoulders, the motor seat has a support portion, the drive shaft and the support portion are rotatably connected, and the support portion is located between the pair of positioning shoulders, and the pair of positioning shoulders are used to limit the axial displacement of the drive shaft.

[0021] In a second aspect, the present application further provides an endoscope system, which includes a motor rotation positioning mechanism as described in any one of the above embodiments.

[0022] The embodiments of the present application have the following advantages:

[0023] The present application provides a motor rotation positioning mechanism, in which the spiral groove of the drive shaft allows the insertion end of the positioning member to slide and cooperate with it. When the motor rotates, the drive shaft also rotates, driving the spiral groove to rotate, and then pushing the positioning member to move along the spiral groove, achieving precise positioning of the movable lens. This method utilizes the transmission principle of the spiral mechanism to convert the rotational motion of the motor into the linear motion of the positioning member. The guide rail is connected to the positioning member to ensure the stability of the positioning member's movement trajectory. The limit ends set at both ends of the drive shaft limit the movement range of the positioning member, so that the positioning member has a starting position and an end position. When the positioning member moves to the preset position, it contacts the limit end, and the motor can stop rotating accordingly, achieving precise positioning without relying on the motor to stop, reducing the demand for motor torque. Obviously, the present application also avoids the wear caused by long-term motor stalling, reduces the demand for motor torque, thereby reducing the loss of the motor and steel wire, and extending the service life of the entire system. In particular, the torsional reliability of the steel wire is significantly improved.

[0024] The present application also relates to an endoscope system. Since the above-mentioned motor rotation positioning mechanism has the above-mentioned technical effects, the endoscope system including the motor rotation positioning mechanism should have the same technical effects, which will not be repeated here.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic structural diagram of a motor rotation positioning mechanism provided in an embodiment of the present application is shown;

[0028] Figure 2 A schematic diagram of an explosion in a motor rotation positioning mechanism provided by an embodiment of the present application is shown;

[0029] Figure 3 A schematic structural diagram of a slider in a motor rotation positioning mechanism provided in an embodiment of the present application is shown;

[0030] Figure 4 A schematic diagram of the assembly of a slider and a drive shaft in a motor rotation positioning mechanism provided in an embodiment of the present application is shown.

[0031] Description of main component symbols:

[0032] 100-positioning part; 110-pin shaft; 120-slider; 121-pin hole; 122-slideway; 200-drive shaft; 210-shaft shoulder; 220-spiral groove; 221-limit end; 300-motor; 400-motor seat; 500-guide plate; 600-slideway. DETAILED DESCRIPTION

[0033] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0035] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the template description herein are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] In related technologies, endoscope systems are widely used in the medical field. They are inserted into natural channels of the human body (digestive cavity, respiratory cavity, etc.) and obtain images of the lesion site in the cavity through the imaging system at the head end for observation, diagnosis, and treatment. During the observation, diagnosis, and treatment process, it is clinically necessary to enlarge or reduce the lesion site. In this process, it is necessary to adjust the position of the movable lens in the objective lens module to adjust the object distance of the image transmission objective lens.

[0039] In the endoscope system, the motor drives the drive shaft to rotate to achieve the movement of the mobile lens in the objective lens module. When the motor rotates, the twisting of the steel wire of the endoscope system generates resistance, causing the motor to stall. Since the twisting resistance of the steel wire cannot be controlled, the motor cannot be accurately controlled to stop in place. In addition, the torque required for the motor to stall is relatively large. After long-term use, the torsional reliability of the steel wire is reduced.

[0040] like Figure 1 and Figure 2 As shown, in order to solve the above technical problems, an embodiment of the present application provides a motor rotation positioning mechanism, which includes a drive shaft 200, a positioning member 100 and a guide rail. The drive shaft 200 has a spiral groove 220, and the drive shaft 200 is connected to the main shaft of the motor 300; the positioning member 100 has an insertion end, the insertion end is at least partially located in the spiral groove 220, and the insertion end and the spiral groove 220 are slidably matched; the guide rail is connected to the positioning member 100, and the guide rail is arranged to extend along the axial direction of the drive shaft 200; limiting ends 221 are respectively provided at both ends of the drive shaft 200, the positioning member 100 is located between a pair of limiting ends 221, and the limiting end 221 is located on the moving path of the positioning member 100.

[0041] In this embodiment, the driving shaft 200 is provided with a spiral groove 220, and the positioning member 100 slides with the spiral groove 220, utilizing the principle of thread. When the motor 300 drives the shaft 200 to rotate, the sliding fit between the insertion end of the positioning member 100 and the spiral groove 220 ensures that when the motor 300 rotates, the positioning member 100 can move smoothly along the spiral groove 220. By precisely controlling the pitch of the spiral groove 220, precise control of the moving distance can be achieved, thereby accurately controlling the position of the moving lens.

[0042] Of course, the guide rail is connected to the positioning member 100 and extends axially along the drive shaft 200, ensuring the linearity and stability of the positioning member 100 during movement, avoiding lateral deviation, and further improving positioning accuracy. The limit ends 221 located at both ends of the drive shaft 200 not only limit the range of movement of the positioning member 100, preventing it from exceeding the predetermined path, but also trigger a feedback mechanism when the positioning member 100 reaches the predetermined position, that is, through contact with the limit ends 221, causing the motor 300 to stop at the appropriate time, eliminating the need to rely on wire stalling to determine the stopping time, thereby improving the reliability and response speed of the system, as well as the accuracy of the stopping position.

[0043] For example, the limiting ends 221 are directly mounted on both ends of the drive shaft 200. The limiting ends 221 rotate with the drive shaft 200. When the positioning member 100 moves axially along the drive shaft 200, the limiting ends 221 contact the positioning member 100 to limit the position, thereby allowing the positioning member 100 to have two extreme positions. When the positioning member 100 and the limiting ends 221 contact, it means that the positioning member 100 is at the extreme position, eliminating the need to rely on wire stalling to determine whether the positioning member 100 is in the extreme position.

[0044] For example, the guide rail is configured as a sliding guide rail; of course, in other embodiments, the guide rail may also be a rolling guide rail, a V-shaped guide rail, a dovetail guide rail, etc., which is not specifically limited here, as long as the swing of the positioning member 100 can be limited.

[0045] Using the motor rotation positioning mechanism provided by the present application, the spiral groove 220 of the drive shaft 200 enables the insertion end of the positioning member 100 to slide with it. When the motor 300 rotates, the drive shaft 200 also rotates, driving the spiral groove 220 to rotate, and then pushing the positioning member 100 to move along the spiral groove 220, thereby achieving precise positioning of the movable lens. This method utilizes the transmission principle of the spiral mechanism to convert the rotational motion of the motor 300 into the linear motion of the positioning member 100. The guide rail is connected to the positioning member 100 to ensure that the moving trajectory of the positioning member 100 is stable, and the limit ends 221 set at both ends of the drive shaft 200 limit the moving range of the positioning member 100, so that the positioning member 100 has a starting position and an end position. When the positioning member 100 moves to the preset position, it contacts the limit ends 221, and the motor 300 can stop rotating accordingly, achieving precise positioning without relying on the motor 300 to stop, reducing the demand for the torque of the motor 300.

[0046] Obviously, the present application also avoids the wear caused by long-term stalling of the motor 300, reduces the torque demand of the motor 300, thereby reducing the loss of the motor 300 and the steel wire, and extending the service life of the entire system, especially the torsional reliability performance of the steel wire is significantly improved.

[0047] like Figure 2 and Figure 4As shown, in some embodiments, limiting ends 221 are respectively provided at both ends of the spiral groove 220 , and the limiting ends 221 are connected to the groove wall of the spiral groove 220 .

[0048] In these embodiments, limit ends 221 are provided at both ends of the spiral groove 220 and are connected to the groove walls of the spiral groove 220, thereby precisely controlling and limiting the range of motion and the stopping position of the sliding assembly or moving part. The limit ends 221 act as physical barriers, rotating synchronously with the drive shaft 200 to determine the end point of movement of the positioning member 100 engaged with the spiral groove 220, ensuring that the moving assembly stops stably and accurately within a predetermined range.

[0049] Apparently, by configuring the limiter end 221, in a mechanical or mechatronic system, the contact feedback from the limiter end 221 can be directly used to control the start and stop of the motor 300. This position signal simplifies the control logic of the motor 300, eliminates the need for complex sensors to detect position, and reduces system complexity and cost. Furthermore, it can replace the use of wire stalling to control the start and stop of the motor 300, thus reducing damage to the wire.

[0050] In an exemplary embodiment, the limiting end 221 is welded to the drive shaft 200. Of course, in other embodiments, the limiting end 221 and the drive shaft 200 are integrally provided, which is not specifically limited here. It should be noted that the positioning member 100 and the drive shaft 200 are first connected, and then the limiting end 221 is installed on the drive shaft 200.

[0051] like Figure 3 and Figure 4 As shown, in some embodiments, the positioning member 100 includes a slider 120 and a guide portion, the slider 120 has a slide 122, and the drive shaft 200 is passed through the slide 122; the guide portion and the slider 120 are detachably connected, the guide portion is partially located in the spiral groove 220, and the guide portion and the spiral groove 220 are slidably matched.

[0052] In these embodiments, the positioning member 100 utilizes a combination of a slider 120 and a slideway 122. The slider 120 is a portion of the positioning member 100 and includes the slideway 122, which is configured to accommodate the passage of the drive shaft 200. This arrangement allows the drive shaft 200 to rotate freely within the slideway 122 without affecting the linear movement of the slider 120 along the drive shaft 200, thereby ensuring efficient conversion from rotational motion to linear motion.

[0053] The guide is also a key component of the positioning member 100. Its removable connection to the slider 120 facilitates installation, adjustment, and maintenance. The guide is partially embedded in the spiral groove 220 and slides with it, ensuring precise guidance of the slider 120 as it moves along the drive shaft 200, preventing deviation and increasing the stability and accuracy of the system.

[0054] For example, the guide portion is connected to the slider 120 by screws, thereby enabling the slider 120 to be assembled to the driving rod first and then fixed to the slider 120 .

[0055] Obviously, through the sliding fit between the slider 120 and the drive shaft 200, and the interaction between the guide portion and the spiral groove 220, the system can more precisely control the position and motion trajectory of the moving part. This design reduces deviation during the motion process and improves positioning accuracy.

[0056] like Figure 4 As shown, in some embodiments, the guide portion includes a pin shaft 110, and a pin hole 121 is provided on one side of the slider 120. The pin hole 121 passes through the inner wall of the slide 122. The pin shaft 110 is passed through and fixed in the pin hole 121, and one end of the pin shaft 110 located in the slide 122 slides in cooperation with the spiral groove 220.

[0057] In these embodiments, the mechanical connection between the slider 120 and the guide portion is achieved by having the pin 110 pass through and be fixed in a pin hole 121 on one side of the slider 120. The pin hole 121 passes through the inner wall of the slide 122, thereby ensuring the stable installation of the pin 110 without affecting the free rotation of the drive shaft 200 in the slide 122. The other end of the pin 110 is located inside the slide 122 and slides with the inner wall of the spiral groove 220, so that the pin 110 can move precisely along the trajectory of the spiral groove 220, thereby guiding the slider 120 to move along the precise straight path of the drive shaft 200. The sliding fit of the pin 110 in the spiral groove 220 ensures the smoothness and directionality of the movement, thereby improving the positioning accuracy and movement stability of the entire system.

[0058] Due to the connection between the pin shaft 110 and the pin hole 121 and the fact that the pin shaft 110 is a consumable part, the guide part can be relatively easily disassembled or replaced when maintenance or structural adjustment is required, which provides convenience for system maintenance and optimization.

[0059] Illustratively, the pin shaft 110 and the pin hole 121 are interference fit; of course, in other embodiments, the pin shaft 110 and the pin hole 121 are threadedly connected; or, the pin shaft 110 and the pin hole 121 are welded, etc.

[0060] like Figure 4 As shown, in some embodiments, the slideway 122 and the drive shaft 200 are clearance-fitted, and the ends of both ends of the spiral groove 220 respectively form limiting ends 221 .

[0061] In these embodiments, the slide 122 and the drive shaft 200 adopt a clearance fit, which means that the drive shaft 200 can rotate freely in the slide 122 with a certain tiny gap. This design helps to reduce friction, improve the smoothness of movement, and allow a certain assembly tolerance, making the installation of components more flexible.

[0062] At the same time, a spiral groove 220 of a preset length is only provided in the middle of the drive shaft 200, that is, the end surfaces of both ends of the spiral groove 220 form the limit ends 221. Obviously, the stroke of the positioning member 100 can be controlled by controlling the length of the spiral groove 220.

[0063] In other words, in other embodiments, by installing limit members at both ends of the spiral groove 220, the limit members are used to form a limit end 221, ensuring that the limit end 221 does not protrude from the notch of the spiral groove 220, and ensuring that the limit end 221 is flush with or embedded in the groove wall of the spiral groove 220, it can be prevented that during the operation of the equipment, the limit end 221 is prevented from damaging the surrounding structure or interfering with the normal operation of other components due to accidental collision or vibration. Among them, the limit end 221 does not exceed the spiral groove 220, which is conducive to a compact layout, especially in application scenarios with limited space, which can reduce the volume of the entire device and optimize the structural compactness and integration of the equipment. In addition, such a design makes it difficult for the limit end 221 to interfere with other components during equipment maintenance or assembly, making it convenient to disassemble and assemble the slider 120.

[0064] For example, a spiral groove 220 is provided in the middle of the driving shaft 200, and the two ends of the spiral groove 220 form limit ends 221. Then, when the pin shaft 110 and the end of the spiral groove 220 abut, it means that the movable lens moves into place, and the stop position can be accurately controlled.

[0065] In some embodiments, the motor rotation positioning mechanism further includes a motor base 400 , which is connected to the motor 300 and the guide rail respectively, and the drive shaft 200 is rotationally connected to the motor base 400 .

[0066] In these embodiments, the motor base 400 serves as a connecting bridge between the motor 300 and the guide rail, providing a stable installation platform, ensuring the fixed installation position of the motor 300, and avoiding vibration or displacement of the motor 300 during operation.

[0067] The motor base 400 integrates the motor 300, drive shaft 200, guide rails, and other components, simplifying the system assembly process and improving assembly efficiency. This integration not only makes the structure more compact but also facilitates maintenance and adjustment. For example, when replacing the motor 300 or adjusting the position of the guide rail, the motor base 400 acts as a single unit, simplifying the operation steps.

[0068] like Figure 2As shown, in some embodiments, the guide rail includes a guide plate 500, which is connected to the motor base 400. The guide plate 500 and the motor base 400 are surrounded by a slide groove 600, which is extended along the axial direction of the drive shaft 200, and the positioning member 100 and the slide groove 600 are slidably matched.

[0069] In these embodiments, the guide plate 500 is directly connected to the motor base 400 as a part of the guide rail. Through integration with the motor base 400, the overall rigidity and stability are enhanced, ensuring the stability of the guide system.

[0070] The guide plate 500 and the motor base 400 cooperate to form a slideway 600, which is aligned axially with the drive shaft 200, providing a clear and continuous linear motion path for the positioning member 100. This design ensures the straightness and accuracy of the positioning member 100 during movement and reduces motion deviation.

[0071] The sliding fit between the positioning member 100 and the slide 600 ensures smooth movement of the positioning member 100 within the slide 600. Precise dimensional fit also limits unnecessary lateral movement, improving the system's positioning stability and repeatability. Furthermore, the direct connection between the guide plate 500 and the motor base 400 reduces the space occupied by the guide rail structure.

[0072] In some embodiments, the guide plate 500 and / or the motor base 400 have weight-reducing holes.

[0073] In these embodiments, the guide plate 500 and / or the motor base 400 are designed with weight-reducing holes. The provision of the weight-reducing holes can effectively reduce the weight of the guide plate 500 and the motor base 400, which is particularly important for endoscopic equipment.

[0074] like Figure 2 As shown, in some embodiments, the drive shaft 200 has a pair of positioning shoulders 210, the motor seat 400 has a support portion, the drive shaft 200 and the support portion are rotatably connected, and the support portion is located between the pair of positioning shoulders 210, and the pair of positioning shoulders 210 are used to limit the axial displacement of the drive shaft 200.

[0075] In these embodiments, the connection structure between the drive shaft 200 and the motor base 400 utilizes a locating shoulder 210 and a supporting portion. A pair of locating shoulders 210 are provided on the drive shaft 200, located at either end or at specific locations thereof, to define the axial movement range of the drive shaft 200. This design ensures that the drive shaft 200 remains in its predetermined position during rotation, preventing unnecessary axial movement and improving system stability and motion accuracy.

[0076] The drive shaft 200 is connected to the support portion of the motor base 400 through rotation, which means that the drive shaft 200 can rotate around the support portion, and the support portion itself is fixed to the motor base 400. This connection method ensures that the power of the motor 300 can be smoothly transmitted to the drive shaft 200, while allowing the drive shaft 200 to rotate freely without being affected by axial forces. The support portion of the motor base 400 directly cooperates with the positioning shoulder 210 of the drive shaft 200, not only providing strong support for the drive shaft 200, but also increasing the rigidity of the entire rotating mechanism, reducing deformation caused by vibration or external forces, thereby ensuring long-term stability and reliability.

[0077] In some embodiments, the present application also provides an endoscope system, which includes a motor rotation positioning mechanism as described in any one of the above embodiments.

[0078] Since the above-mentioned motor rotation positioning mechanism has the above-mentioned technical effects, the endoscope system including the motor rotation positioning mechanism should have the same technical effects, which will not be described in detail here.

[0079] It should be noted that the endoscope system's wire is connected to the end of the drive shaft 200 away from the motor 300. During operation, when the positioning member 100 abuts the corresponding limit end 221, it means that the movable lens is controlled to move into position, without relying on wire stalling.

[0080] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not limiting, and thus other examples of the exemplary embodiments may have different values.

[0081] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0082] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present application, and such modifications and improvements are all within the scope of protection of the present application.

Claims

1. A motor rotation positioning mechanism, characterized in that: The motor rotation positioning mechanism comprises: a positioning member having an insertion end; A drive shaft having a spiral groove in the middle thereof and connected to the main shaft of the motor; each end of the drive shaft has a limit end, the positioning member is located between a pair of the limit ends, and the limit ends are located on the movement path of the positioning member; wherein the insertion end is at least partially located in the spiral groove, and the insertion end and the spiral groove are in sliding engagement; A guide rail is connected to the positioning member, and the guide rail is extended along the axial direction of the drive shaft.

2. The motor rotation positioning mechanism according to claim 1, characterized in that: The limiting ends are respectively provided at both ends of the spiral groove, and the limiting ends are connected to the groove wall of the spiral groove.

3. The motor rotation positioning mechanism according to claim 2, characterized in that: The positioning member includes: A slider, the slider having a slideway, the drive shaft slidingly passing through the slideway; The guide part is detachably connected to the sliding block, the guide part is partially located in the spiral groove, and the guide part and the spiral groove are slidably matched.

4. The motor rotation positioning mechanism according to claim 3, characterized in that: The guide portion comprises: A pin shaft, one side of the slider has a pin hole, the pin hole passes through the inner wall of the slideway, the pin shaft is passed through and fixed in the pin hole, and one end of the pin shaft located in the slideway is in sliding fit with the spiral groove.

5. The motor rotation positioning mechanism according to claim 3, characterized in that: The slideway and the drive shaft are loosely matched, and the ends of both ends of the spiral groove respectively form the limiting ends.

6. The motor rotation positioning mechanism according to claim 1, characterized in that: The motor rotation positioning mechanism also includes: A motor seat is connected to the motor and the guide rail respectively, and the drive shaft is rotatably connected to the motor seat.

7. The motor rotation positioning mechanism according to claim 6, characterized in that: The guide rail includes a guide plate connected to the motor base. The guide plate and the motor base are surrounded by a slide groove, which is extended along the axial direction of the drive shaft, and the positioning member and the slide groove are slidably matched.

8. The motor rotation positioning mechanism according to claim 7, characterized in that: The guide plate and / or the motor seat have weight-reducing holes.

9. The motor rotation positioning mechanism according to claim 6, characterized in that: The drive shaft has a pair of positioning shoulders, the motor seat has a support portion, the drive shaft and the support portion are rotatably connected, and the support portion is located between the pair of positioning shoulders, and the pair of positioning shoulders are used to limit the axial displacement of the drive shaft.

10. An endoscope system, characterized in that: The endoscope system includes the motor rotation positioning mechanism according to any one of claims 1 to 9.

Images