A light-adjusting flexible shaft with preset fixed angle conversion function

Abstract

The application relates to the technical field of mechanical transmission, in particular to a light-adjusting flexible shaft with preset fixed-angle conversion function, which comprises a transmission mandrel, the transmission mandrel is provided with clamping structures near two end positions and can rotate relative to the clamping structures, an adjusting end operation joint and an executing end transmission joint are respectively arranged at the two ends, an angle conversion mechanism can be detachably arranged on the adjusting end operation joint, the mechanism comprises a closed shell and at least two transmission gears which are meshed with each other, one of the transmission gears is coaxially fixed with the transmission mandrel as a rotary power input end, at least one other transmission gear has an axis which is at a preset fixed angle with the transmission mandrel as a rotary power output end, the output end transmission gear is provided with a workpiece mounting bayonet, and the rotating direction of the transmission mandrel is converted to the preset fixed angle and then transmitted to external operation workpieces through the meshing of the transmission gears. The application achieves the preset fixed-angle conversion of the rotating direction and facilitates light-adjusting operation of different angles.

Description

Technical Field

[0001] This application relates to the field of mechanical transmission technology, and in particular to a dimming flexible shaft with a preset fixed angle conversion function. Background Technology

[0002] In the field of optical adjustment technology, with the continuous development of industries such as stage lighting, photographic lighting, and architectural decorative lighting, the demand for precise adjustment of light intensity and direction is increasing. Precise light adjustment can create a rich variety of light and shadow effects, enhancing the visual impact of stage performances, the artistic expression of photographic works, and the aesthetics of architectural decorations. This has prompted related companies and researchers to continuously explore more efficient and flexible dimming technologies to meet the market's requirements for high-quality light adjustment.

[0003] Traditionally, flexible dimming shafts are used to achieve light adjustment. These shafts offer a certain degree of adjustment precision, working by changing light parameters through the movement or rotation of the shaft. However, traditional flexible dimming shafts have a short travel, limiting their use in long-distance lighting setups. Furthermore, they can only transmit force in one direction, often requiring multiple shafts to be used in combination when facing complex lighting arrangements and multi-angle adjustment needs. This combination not only increases the complexity and cost of the equipment but also makes installation and operation cumbersome.

[0004] Traditional dimming flexible shafts have significant drawbacks. Due to their short travel and ability to transmit force in only one direction, they are bulky and lack flexibility when dealing with complex lighting arrangements and multi-angle adjustments. They cannot meet the requirements of long-distance working environments or confined and challenging working environments, limiting their application in certain special scenarios. Utility Model Content

[0005] The purpose of this application is to provide a dimming flexible shaft with a preset fixed angle conversion function.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution: a dimming flexible shaft with a preset fixed angle conversion function, comprising a transmission spindle, wherein the transmission spindle is provided with a snap-fit ​​structure near both ends, the snap-fit ​​structure being used to install and fix the transmission spindle on a mounting carrier, and the transmission spindle being rotatable relative to the snap-fit ​​structure; an adjustment end operating connector and an execution end transmission connector are respectively installed at both ends of the transmission spindle, the adjustment end operating connector being detachably mounted with an angle conversion mechanism, the angle conversion mechanism comprising a closed housing and at least two meshing transmission gears disposed inside the closed housing; one of the transmission gears is coaxial with the transmission spindle and circumferentially fixed, constituting a rotational power input end; the axis of at least one other transmission gear is set at a preset fixed angle with the axis of the transmission spindle, constituting a rotational power output end; the transmission gear of the rotational power output end is provided with a workpiece mounting slot, the workpiece mounting slot being used for positioning and engaging with an external operating workpiece; through the meshing transmission between the transmission gears, the rotation direction of the transmission spindle is converted to the preset fixed angle, and then transmitted to the external operating workpiece through the workpiece mounting slot.

[0007] By adopting the above technical solution, the problems of traditional dimming flexible shafts being limited to unidirectional force transmission and lacking flexibility are effectively solved. With the help of a detachable angle conversion mechanism at the adjustment end, the rotation direction of the transmission spindle is converted to a preset fixed angle using internally meshing transmission gears. This adapts to the operational needs in complex or confined spaces, breaking through the limitations of traditional flexible shafts in various application scenarios. The snap-fit ​​structures at both ends of the transmission spindle ensure stable installation with the mounting carrier and smooth rotation of the transmission spindle relative to the snap-fit ​​structure, ensuring the stability and reliability of the light adjustment process. The detachable design of the angle conversion mechanism facilitates subsequent maintenance and replacement, reducing usage and maintenance costs. The workpiece mounting bayonet at the rotary power output end can precisely position and cooperate with external operating workpieces, ensuring effective transmission of rotary power. Simultaneously, the overall structural design is simple and compact, making installation and operation convenient, significantly improving the adaptability and practicality of the dimming flexible shaft and overcoming the shortcomings of traditional dimming flexible shafts in multi-angle and complex scenarios.

[0008] Optionally, the transmission gear is a bevel gear, and the sum of the pitch cone angles of the meshing transmission gears is consistent with the preset fixed angle.

[0009] By adopting the above technical solution, the bevel gear itself is adapted to the structural characteristics of the interlocking shaft transmission, which can achieve stable angle conversion transmission in a compact space. With the precise matching of the sum of the cone angles of the meshing bevel gear segments with the preset fixed angle, the angle accuracy of the rotation direction conversion can be ensured, avoiding angle deviations that affect the lighting adjustment effect. At the same time, the torque transmission loss of the bevel gear meshing transmission is small and the transmission stability is strong, which can ensure the effective transmission of rotational power from the transmission spindle to the external operating workpiece. It is further adapted to narrow and complex operating environments, making the conversion of the preset fixed angle more reliable and the dimming operation more precise. It effectively makes up for the shortcomings of ordinary transmission gears in angle conversion adaptability and precision control, and improves the reliability and adaptability of the dimming flexible shaft in precise optical adjustment scenarios.

[0010] Optionally, the preset fixed angle is 60°-120°.

[0011] By adopting the above technical solution, the preset fixed angle range of 60°-120° accurately covers the common intersecting shaft transmission requirements in scenarios such as stage lighting setup, photographic lighting adjustment, and architectural decorative lighting installation. This avoids the limitations of scene adaptation caused by a single angle limitation, while also meeting the angle conversion requirements in different confined spaces and installation orientations, allowing the dimming flexible shaft to flexibly adapt to diverse optical adjustment layouts. The conversion within this angle range meets the mechanical stability requirements of gear meshing transmission, reducing losses and deviations during torque transmission. It also eliminates the need for specially sized transmission components, reducing production and adaptation costs. Furthermore, combined with the core function of the angle conversion mechanism, it further broadens the application scenarios of the dimming flexible shaft in complex installation environments, ensuring precise and stable light angle adjustment under different working conditions, thus enhancing the product's versatility and practical value.

[0012] Optionally, the transmission mandrel includes a sleeve and a flexible metal wire core passing through the sleeve.

[0013] By adopting the above technical solution, the transmission spindle uses a combination structure of a sleeve and a flexible metal wire core. The flexible metal wire core can maintain good flexibility and deformation capability while transmitting rotational power, adapting to the bending arrangement requirements under different installation layouts. The sleeve can effectively protect the internal flexible metal wire core, reducing the wear of the metal wire core caused by external friction and collision, and preventing wear and breakage during repeated bending or long-term use, thus extending the service life of the transmission spindle. At the same time, this combination structure not only ensures the overall structural stability of the transmission spindle, but also does not affect the smooth transmission of rotational power, ensuring the continuity and reliability of torque transmission during light adjustment, and further improving the adaptability and durability of the dimming flexible shaft in diverse optical adjustment scenarios.

[0014] Optionally, the sleeve material is selected from nylon, PVC reinforced plastic or metal corrugated pipe; the flexible metal wire core is made of high carbon spring steel wire or galvanized iron wire, and the flexible metal wire core is a single wire or a multi-strand wire twisted structure.

[0015] By adopting the above technical solutions, the nylon, PVC reinforced plastic, or metal corrugated pipe selected for the flexible protective sleeve all possess both good flexibility and structural strength. This allows it to adapt to the bending arrangement requirements of the dimming flexible shaft in complex installation scenarios, while effectively isolating it from external friction and impurity corrosion, providing reliable protection for the internal flexible metal wire core and preventing wear and deformation during repeated bending or long-term use. The flexible metal wire core, made of high-carbon spring steel wire or galvanized iron wire, has high strength and good toughness. Galvanized iron wire also has excellent rust and corrosion resistance. The single-wire structure is easy to process and adapt to simple scenarios, while the multi-strand twisted structure further enhances the force transmission stability and fatigue fracture resistance, ensuring the smoothness and continuity of rotational torque transmission. Multiple material options and wire structure designs allow for flexible adaptation to different application scenarios such as stage lighting and photography lighting, based on environmental conditions (e.g., wear level, corrosion risk) and usage requirements. This extends the service life of the transmission spindle and ensures the structural reliability and power transmission accuracy of the dimming flexible shaft during long-term, repeated adjustments, improving the product's adaptability and durability.

[0016] Optionally, the enclosed housing has a clearance opening on one side corresponding to the rotational power output end, which is adapted to the workpiece mounting slot; the workpiece mounting slot is an internal hexagonal slot, a slotted slot, or a cross slot.

[0017] By adopting the above technical solutions, the clearance openings on the enclosed shell, designed to accommodate the workpiece mounting bayonet, provide ample space for the docking of external workpieces with the bayonet, preventing the shell from interfering with the operation process. This ensures smooth workpiece assembly and rotation adjustment even in confined installation environments, improving operational convenience. The internal hexagonal bayonet, slotted bayonet, or Phillips head bayonet designs are all standard interface types commonly used in the industry, directly compatible with common external tools such as wrenches and screwdrivers, eliminating the need for custom-made tools and significantly lowering the operational threshold. The diverse bayonet types also flexibly adapt to the tool requirements of different scenarios, broadening the applicability of the dimming flexible shaft. Furthermore, the precise fit between the clearance openings and the bayonet ensures accurate positioning of the external workpiece and the bayonet, reducing offset and loss during power transmission, resulting in more precise and stable light angle adjustment, further enhancing product practicality and user experience.

[0018] In summary, this application has at least the following beneficial effect: 1. Effectively solves the problems of traditional dimming flexible shafts, which can only transmit force in one direction and lack flexibility. With the help of a detachable angle conversion mechanism at the adjustment end, the rotation direction of the transmission spindle is converted to a preset fixed angle using internal meshing transmission gears. This adapts to the operational needs in complex or confined spaces, breaking through the limitations of traditional flexible shafts in terms of usage scenarios. The snap-fit ​​structure at both ends of the transmission spindle not only ensures a stable installation with the mounting carrier but also guarantees smooth rotation of the transmission spindle relative to the snap-fit ​​structure, ensuring the stability and reliability of the light adjustment process. The detachable design of the angle conversion mechanism facilitates subsequent maintenance and replacement, reducing usage and maintenance costs. The workpiece mounting bayonet at the rotation power output end can accurately position and cooperate with external operating workpieces, ensuring effective transmission of rotational power. At the same time, the overall structural design is simple and compact, and the installation and operation are convenient, significantly improving the adaptability and practicality of the dimming flexible shaft and making up for the shortcomings of traditional dimming flexible shafts in multi-angle and complex scenarios.

[0019] 2. The bevel gear itself is adapted to the structural characteristics of interlocking shaft transmission, enabling stable angle conversion transmission in a compact space. With the precise matching of the sum of the cone angles of the meshing bevel gear segments with the preset fixed angle, the angle accuracy of rotation direction conversion can be ensured, avoiding angle deviations that affect the lighting adjustment effect. At the same time, the torque transmission loss of the bevel gear meshing transmission is small and the transmission stability is strong, which can ensure the effective transmission of rotational power from the transmission spindle to the external operating workpiece. This further adapts to narrow and complex operating environments, making the conversion of the preset fixed angle more reliable and the dimming operation more precise. It effectively makes up for the shortcomings of ordinary transmission gears in angle conversion adaptability and precision control, and improves the reliability and adaptability of the dimming flexible shaft in precise optical adjustment scenarios. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a dimming flexible shaft with a preset fixed angle conversion function; Figure 2 This is a schematic diagram showing the status of the adjustment end operating joint and the angle conversion mechanism; Figure 3 This is a schematic diagram of the transmission gear assembly; Figure 4 This is a schematic diagram of the transmission spindle.

[0021] Figure Labels 1. Drive spindle; 11. Sleeve; 12. Flexible metal wire core; 2. Snap-fit ​​structure; 3. Adjustment end operating joint; 4. Actuation end drive joint; 5. Angle conversion mechanism; 51. Enclosed housing; 52. Drive gear; 6. Workpiece mounting bayonet; 7. Clearance opening. Detailed Implementation

[0022] The technical solutions in the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of this utility model, but are not limited thereto. Other embodiments obtained by those skilled in the art in conjunction with the embodiments of this utility model without creative effort are also within the protection scope of this utility model.

[0023] This application mainly adopts a dimming flexible shaft with an angle conversion mechanism 5 to realize the rotation direction conversion, thereby meeting the needs of complex light arrangement and multi-angle adjustment and improving the dimming flexibility. The following is a further detailed description of this application.

[0024] Example 1 Reference Figures 1-4 The dimming flexible shaft with preset fixed angle conversion function provided in this application embodiment includes a transmission spindle 1, a snap-fit ​​structure 2, an adjustment end operating connector 3, an execution end transmission connector 4, and an angle conversion mechanism 5. The snap-fit ​​structure 2 is located near both ends of the transmission spindle 1, used to mount and fix the transmission spindle 1 onto the mounting carrier, and the transmission spindle 1 can rotate relative to the snap-fit ​​structure 2. The adjustment end operating connector 3 and the execution end transmission connector 4 are respectively installed at both ends of the transmission spindle 1. The angle conversion mechanism 5 is detachably installed on the adjustment end operating connector 3. Through the meshing transmission between the transmission gears 52, the rotation direction of the transmission spindle 1 is converted to a preset fixed angle, and then transmitted to the external operating workpiece via the workpiece mounting bayonet 6. This achieves the effect of adapting to complex light arrangements and multi-angle adjustment needs, improving dimming flexibility. This is because the snap-fit ​​structure 2 ensures the installation stability and rotatability of the transmission spindle 1, and the angle conversion mechanism 5 can change the transmission direction, thereby satisfying different angle adjustments.

[0025] Specifically, the transmission mandrel 1 includes a sleeve 11 and a flexible metal wire core 12 inserted inside the sleeve 11. The sleeve 11 is a flexible protective sleeve, which can be made of nylon, a material with good flexibility and wear resistance, effectively protecting the internal flexible metal wire core 12. Alternatively, PVC reinforced plastic can be used, a material with high strength and relatively low cost; metal corrugated pipe can also be used, as it has good corrosion resistance and durability. The flexible metal wire core 12 is made of high-carbon spring steel wire, which has good elasticity and high strength, ensuring the accuracy of transmission. It can also be made of galvanized iron wire, which has a certain degree of flexibility and corrosion resistance. The flexible metal wire core 12 can be a single wire or a multi-strand stranded structure. A single wire structure is simple, while a multi-strand stranded structure improves the overall strength and flexibility. The sleeve 11 is fitted over the flexible metal wire core 12, forming a whole to achieve power transmission.

[0026] Specifically, the snap-fit ​​structure 2 is used to fix the transmission spindle 1 on the mounting carrier. It can be a clamp, which is usually made of metal and has a certain elasticity, so as to tightly clamp the transmission spindle 1. It can also be a slot structure, which can be a groove opened on the mounting carrier into which the transmission spindle 1 is snapped.

[0027] Specifically, the adjustment end operating connector 3 is installed at one end of the transmission spindle 1 and is connected to the transmission spindle 1 by welding or other fixing methods. The adjustment end operating connector 3 facilitates the operation of the transmission spindle 1 by the operator. The actuation end transmission connector 4 is installed at the other end of the transmission spindle 1. Its structure is similar to that of the adjustment end operating connector 3. It is also used to connect with other components to transmit the power of the transmission spindle 1.

[0028] Specifically, the angle conversion mechanism 5 includes a closed housing 51 and at least two meshing transmission gears 52 disposed inside the closed housing 51. The closed housing 51 can be made of plastic, which is lightweight and inexpensive, or it can be made of metal, which is strong and durable. The closed housing 51 encloses the transmission gears 52 inside, providing protection and dust protection. The transmission gears 52 are bevel gears, and the sum of the pitch cone angles of the meshing transmission gears 52 is consistent with a preset fixed angle. For example, when the preset fixed angle is 90°, the sum of the pitch cone angles of the two meshing bevel gears is 90°. One of the transmission gears 52 is coaxial with the transmission spindle 1 and circumferentially fixed, forming the rotational power input end; the axis of at least one other transmission gear 52 is set at a preset fixed angle with the axis of the transmission spindle 1, forming the rotational power output end. The transmission gear 52 at the rotary power output end is provided with a workpiece mounting slot 6. The workpiece mounting slot 6 can be an internal hexagonal slot, which can be used with tools such as internal hexagonal screwdrivers; it can also be a flathead slot, which can be used with flathead screwdrivers; or it can be a Phillips head slot, which can be used with Phillips head screwdrivers. The closed housing 51 has a relief opening 7 on the side corresponding to the rotary power output end, which is adapted to the workpiece mounting slot 6 so that tools can be smoothly inserted into the workpiece mounting slot 6.

[0029] The implementation principle of this embodiment is as follows: The dimming flexible shaft with preset fixed angle conversion function in this embodiment is stably installed on the mounting carrier by the snap-fit ​​structure 2, and the transmission spindle 1 can rotate. The transmission spindle 1 is composed of a sleeve 11 and a flexible metal wire core 12, which ensures the stability and accuracy of power transmission. The angle conversion mechanism 5 is set up to convert the rotation direction of the transmission spindle 1 by using the meshing transmission gear 52, which can adapt to complex lighting arrangements and multi-angle adjustment needs. Compared with traditional dimming flexible shafts, it improves the flexibility and applicability of dimming, solves the problems of short stroke and unidirectional force transmission of traditional dimming flexible shafts, and can better meet the requirements of precise light adjustment in industries such as stage lighting, photographic lighting, and architectural decorative lighting.

[0030] Example 2 The dimming flexible shaft with preset fixed angle conversion function provided in this application embodiment has a split structure for the closed shell 51 of the angle conversion mechanism 5, which is formed by the upper shell and the lower shell being detachably spliced ​​by bolts. The inner wall of the shell is provided with an annular positioning groove, and a wear-resistant nylon bushing is embedded in the positioning groove. The bushing is clearance-fitted with the shaft of the transmission gear 52, which not only provides radial positioning for the gear shaft, but also reduces rotational friction loss. The end of the adjustment end operating connector 3 is provided with an annular boss, on which three elastic claws are evenly distributed. The corresponding end of the closed housing 51 is provided with a slot that matches the claws. At the same time, the threaded connection between the housing and the connector is wrapped with PTFE tape, forming a double fixing structure of threaded connection and claw engagement, which effectively avoids loosening of the connection caused by frequent adjustment or vibration in scenarios such as stage lighting and architectural decorative lighting.

[0031] The snap-fit ​​structure 2 is an adjustable double-slot structure. Each slot includes a fixed seat and a movable jaw. The fixed seat has an elongated adjustment hole. The movable jaw is slidably connected to the adjustment hole by a locking bolt. The distance between the two slots can be flexibly adjusted according to the actual size of the mounting carrier. The inner side of the movable jaw is provided with an arc-shaped anti-slip pad. The surface of the pad is provided with transverse anti-slip texture, which not only enhances the fit between the snap-fit ​​structure 2 and the transmission spindle 1, but also absorbs slight vibrations during the adjustment process and ensures transmission stability. The sleeve 11 of the transmission mandrel 1 adopts a double-layer structure, with the outer layer being a PVC reinforced plastic sleeve 11 and the inner layer being a flexible rubber protective sleeve. The space between the two layers is filled with fiberglass reinforced cotton, which not only improves the impact resistance of the sleeve 11 but also enhances the heat insulation effect, making it suitable for scenarios such as photography lighting where there may be heat dissipation from the light source. The flexible metal wire core 12 has a reinforcing section in the middle. The reinforcing section adopts a composite structure of multiple strands of wire twisted together and then wrapped with carbon fiber wire. The two ends are still ordinary twisted structures, which not only ensures the overall flexibility of the mandrel but also improves the strength of the middle force transmission section, preventing the mandrel from deforming during long-stroke transmission.

[0032] Example 3 The dimming flexible shaft with preset fixed angle conversion function provided in this application embodiment has three meshing bevel gears inside the closed housing 51 of the angle conversion mechanism 5. One of them is a main drive gear 52 (input end) coaxial with the drive spindle 1 and circumferentially fixed by a flat key. The other two are driven gears 52 (output ends) symmetrically distributed on both sides of the main drive gear 52. The axes of the two driven gears 52 are at a preset fixed angle of 90° with the axis of the main drive gear 52. Each driven gear 52 has an independent workpiece mounting bayonet 6 (an internal hexagonal bayonet and a cross slot bayonet, respectively). The closed housing 51 has clearance openings 7 at the positions corresponding to the two output ends. Each clearance opening 7 has an identification plate indicating the bayonet type, which is suitable for the scene requirements of multi-directional adjustment of stage lighting or simultaneous control of multiple light sources in photography lighting.

[0033] The sleeve 11 of the transmission spindle 1 is provided with detachable connector seats at both ends. The connector seats are connected to the sleeve 11 by threads. The two ends of the flexible metal wire core 12 pass through the connector seats and are connected to the adjustment end operating connector 3 and the execution end transmission connector 4 by a double connection method of riveting + pin fixing. This not only facilitates the disassembly and replacement of flexible metal wire cores 12 of different materials or specifications, but also improves the force transmission reliability of the spindle and the connector. The outer surface of the sleeve 11 is evenly distributed with axial reinforcing ribs. The reinforcing ribs are integrally formed with the sleeve 11 and the material is the same as that of the sleeve 11 (nylon or PVC reinforced plastic). This not only enhances the bending strength of the sleeve 11, but also reduces the contact area between the sleeve 11 and the snap-fit ​​structure 2 during adjustment, thereby reducing frictional resistance.

[0034] The snap-fit ​​structure 2 adopts a quick-release design, including a fixed bracket and a movable snap ring. The fixed bracket is fixed to the mounting carrier (such as the bracket of architectural decorative lighting or the lamp stand of stage lighting) by expansion bolts. The movable snap ring is hinged to the fixed bracket by a hinge. The free end of the snap ring has a snap-lock, which locks it in place after closing. The inner side of the snap ring has an annular buffer groove, in which an elastic silicone ring is embedded. The cross-section of the silicone ring is semi-circular, which can adapt to the change of the outer diameter of the transmission spindle 1 and absorb vibration during adjustment to avoid abnormal noise. The angle conversion mechanism 5 has a detachable extension sleeve on the outside of the closed shell 51. The extension sleeve is connected to the shell by threads. The length of the sleeve can be flexibly selected according to the depth of the operating space. The inner wall of the sleeve has a guide groove. When the external workpiece is inserted, it slides along the guide groove to ensure precise docking with the workpiece mounting slot 6. At the same time, the outer wall of the sleeve has anti-slip texture, which makes it easy for the operator to grip and apply force. It is especially suitable for the narrow and deep installation space in architectural decorative lighting, further expanding the applicable scenarios of the dimming flexible shaft.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dimming flexible shaft with a preset fixed angle conversion function, characterized in that, The system includes a transmission spindle (1), with snap-fit ​​structures (2) located near both ends of the transmission spindle (1). The snap-fit ​​structures (2) are used to mount and fix the transmission spindle (1) onto the mounting carrier, and the transmission spindle (1) can rotate relative to the snap-fit ​​structures (2). An adjustment end operating connector (3) and an execution end transmission connector (4) are respectively installed at both ends of the transmission spindle (1). An angle conversion mechanism (5) is detachably installed on the adjustment end operating connector (3). The angle conversion mechanism (5) includes a closed housing (51) and at least two meshing transmission gears (5) disposed inside the closed housing (51). 2); One of the transmission gears (52) is coaxial with the transmission spindle (1) and circumferentially fixed, forming a rotational power input end; the axis of at least one other transmission gear (52) is set at a preset fixed angle with the axis of the transmission spindle (1), forming a rotational power output end; the transmission gear (52) of the rotational power output end is provided with a workpiece mounting slot (6), which is used to position and cooperate with an external operating workpiece; through the meshing transmission between the transmission gears (52), the rotation direction of the transmission spindle (1) is converted to the preset fixed angle and then transmitted to the external operating workpiece through the workpiece mounting slot (6).

2. The dimming flexible shaft with preset fixed angle conversion function according to claim 1, characterized in that, The transmission gear (52) is a bevel gear, and the sum of the pitch cone angles of the meshing transmission gears (52) is consistent with the preset fixed angle.

3. The dimming flexible shaft with preset fixed angle conversion function according to claim 1, characterized in that, The preset fixed angle is 60°-120°.

4. The dimming flexible shaft with preset fixed angle conversion function according to claim 1, characterized in that, The transmission spindle (1) includes a sleeve (11) and a flexible metal wire core (12) passing through the sleeve (11).

5. The dimming flexible shaft with preset fixed angle conversion function according to claim 4, characterized in that, The sleeve (11) is made of nylon, PVC reinforced plastic or metal corrugated pipe; the flexible metal wire core (12) is made of high carbon spring steel wire or galvanized iron wire, and the flexible metal wire core (12) is a single wire or a multi-strand wire twisted structure.

6. The dimming flexible shaft with preset fixed angle conversion function according to claim 1, characterized in that, The enclosed shell (51) has a clearance opening (7) on one side corresponding to the rotation power output end, which is adapted to the workpiece mounting slot (6); the workpiece mounting slot (6) is an internal hexagonal slot, a slotted slot, or a cross slot.

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