Dental flushing needle bending equipment based on hot air heating

Abstract

The utility model relates to dental flushing needle bending equipment based on hot air heating, which comprises a base assembly, a needle body fixing device, a hot air heating device and a bending actuating mechanism, and the needle body fixing device comprises a positioning base plate, a supporting vertical plate and a conical joint which are sequentially arranged along the axis direction; the hot air heating device comprises a heating shell, an electric heating element and an air guide pipe set, a plurality of air outlets in different axial directions are formed in the tail end of the air guide pipe set, and the air outlets surround the to-be-bent area of the flushing needle to form an annular hot air curtain. The bending executing mechanism comprises a height adjusting assembly, an angle adjusting assembly and a linear driving device, and a bending forming roller capable of rotating around the axis of the flushing needle is arranged at the telescopic end of the linear driving device. The utility model provides a dental flushing needle bending device based on hot air heating. The problems that an existing dental flushing needle bending device is low in efficiency, poor in precision, insufficient in universality, uneven in heating, prone to damaging a needle body during bending and the like are solved.

Description

Technical Field

[0001] This utility model relates to the field of dental instrument manufacturing equipment technology, specifically to a dental irrigating needle bending device based on hot air heating. Background Technology

[0002] Dental irrigation needles play an important role in oral treatment. Different clinical applications often require irrigation needles of different shapes. For example, in some complex root canal treatments, the irrigation needle needs to be bent into a specific angle and shape in order to better reach the treatment site.

[0003] Currently, traditional methods for bending dental irrigation needles mainly rely on manual operation or simple mechanical molds. Manual bending is not only inefficient, but the bending accuracy also depends entirely on the operator's experience, making it difficult to guarantee consistent bending quality for each needle and easily leading to problems such as bending angle deviations and scratches on the needle surface. While simple mechanical molds can improve bending efficiency to some extent, their versatility is poor. Different molds are often required for irrigation needles of different specifications and shapes, which undoubtedly increases production costs and time.

[0004] Furthermore, existing bending equipment has shortcomings in its heating methods. Some equipment uses localized heating or unidirectional heating, which can easily lead to uneven heating of the area to be bent, resulting in inconsistent material properties at the bending point and affecting the overall quality and service life of the irrigation needle. Moreover, during the bending process, due to the lack of effective drag reduction measures, the friction between the needle body and the bending tool is relatively high, which may damage the surface coating of the needle body, thereby affecting its safety during use in the oral cavity.

[0005] Therefore, there is an urgent need for a device that can balance operational efficiency and forming accuracy, and is suitable for the complex bending requirements of flushing needles of different specifications. Utility Model Content

[0006] In view of this, the present invention provides a dental irrigation needle bending device based on hot air heating to solve the problems of low efficiency, poor precision, insufficient versatility, uneven heating, and easy damage to the needle body during bending of existing dental irrigation needle bending devices.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A dental irrigation needle bending device based on hot air heating includes a base assembly, a needle fixing device, a hot air heating device, and a bending actuator. The base assembly has a horizontally arranged mounting platform. The needle fixing device is vertically fixed to the mounting platform and includes a positioning base plate, a support plate, and a tapered joint arranged sequentially along the axial direction. The positioning base plate has a positioning groove adapted to the contour of the irrigation needle base, and the tapered joint has a tapered connection structure for detachably connecting the end of the irrigation needle. The hot air heating device includes a heating shell with an airflow channel, an electric heating element disposed in the airflow channel, and an air guide duct assembly communicating with the airflow channel. The end of the air guide duct assembly has multiple air outlets with different axes, and each air outlet forms an annular hot air curtain around the area to be bent of the irrigation needle. The bending actuator includes a vertically adjustable height adjustment component, an angle adjustment component hinged to the height adjustment component, and a linear drive device fixed to the end of the angle adjustment component. The telescopic end of the linear drive device has a bending forming roller that can rotate around the axis of the irrigation needle, and the rim surface shape of the bending forming roller is adapted to the diameter of the irrigation needle.

[0009] The horizontal mounting platform of the base assembly provides a stable structural foundation for the entire device, ensuring precise spatial positioning of each functional module during operation. The needle fixing device, through a vertical fixing method combined with positioning grooves and a tapered connection structure, achieves bidirectional constraint of the irrigation needle in both the axial and circumferential directions, effectively avoiding forming errors caused by needle displacement during bending. The hot air heating device uses a ring-shaped hot air curtain formed by multi-axial air outlets to uniformly heat the area of ​​the irrigation needle to be bent, softening the material without damaging the needle surface coating. The height and angle adjustment components of the bending actuator work together, allowing the operator to flexibly adjust the bending angle and forming radius according to clinical needs. The linear drive device, combined with rotatable bending forming rollers, reduces frictional resistance during force application, ensuring a smooth bending trajectory. The overall structural design balances operational efficiency and forming accuracy, making it suitable for the complex bending requirements of irrigation needles of different specifications.

[0010] Preferably, the air duct assembly includes a central air duct and at least one lateral air duct, with the air outlet of the central air duct and the air outlet of the lateral air duct arranged orthogonally.

[0011] The orthogonal arrangement of the central and lateral airflow guides optimizes the hot air distribution pattern. The central airflow guide acts directly on the needle's axial region, while the lateral airflow guides cover the lateral surfaces of the bends, forming a multi-dimensional heat conduction path. This design avoids localized overheating or uneven heating caused by unilateral hot airflow, making it particularly suitable for flushing needles with thin walls or irregular cross-sections. The turbulence effect generated by the superposition of orthogonal airflows accelerates heat transfer efficiency, shortens heating time, and reduces the continuous power consumption of the heating element. Furthermore, the branched airflow structure allows for adjustments to the airflow distribution based on the thermal deformation characteristics of different materials. For example, the central airflow intensity can be enhanced for high-melting-point materials, while the lateral airflow can reduce the local temperature gradient for heat-sensitive materials.

[0012] Preferably, the inlet of the air duct assembly is provided with a Venturi accelerator tube, and the throat position is provided with a vortex generator including circumferentially distributed inclined guide vanes.

[0013] The Venturi accelerator tube increases airflow velocity through changes in throat cross-sectional area, allowing hot air to gain higher kinetic energy at the outlet. This enables the hot air to penetrate the air boundary layer on the flushing needle surface, enhancing thermal convection. The inclined guide vanes at the throat induce vortex motion in the airflow, breaking the laminar flow and increasing the contact time between the airflow and the heating element, thus improving thermal energy utilization. The circumferentially distributed vortex generator ensures uniform vortex distribution within the annular flow channel, avoiding localized cooling dead zones caused by airflow deviation. This combined structure achieves rapid heating and precise temperature control while reducing fan power requirements, making it particularly suitable for intermittent heating scenarios requiring frequent start-stop cycles, and reducing the impact of thermal inertia on bending process stability.

[0014] Preferably, the height adjustment component includes a guide column vertically fixed to the base component and a lifting slide that slides with the guide column; the angle adjustment component includes a rotary platform rotatably connected to the lifting slide; the side wall of the guide column is provided with an axially extending guide rail; the lifting slide is provided with a slider that fits into the guide rail; and the end of the slider is provided with a locking mechanism.

[0015] The sliding engagement structure between the guide column and the lifting slide achieves stepless vertical adjustment via a high-precision guide rail pair. The interlocking design of the guide rail and the slider counteracts the lateral torque generated during bending, preventing mechanism swaying. The rotary platform uses a hinged connection, allowing the angle adjustment component to rotate freely within a large angle range. Combined with the locking mechanism, it quickly fixes the target angle, ensuring consistency across multiple batches of bending operations. The modular design of the lifting slide facilitates disassembly and maintenance, while the axial extension characteristics of the guide column support a wide range of height adjustments, adapting to the clamping requirements of flushing needles of different lengths. This mechanism, through the combination of mechanical constraints and dynamic adjustment, significantly reduces the skill threshold for manual operation and improves the repeatability of bending paths in complex spaces.

[0016] Preferably, the lateral guide tubes are symmetrically distributed on both sides of the flushing needle axis.

[0017] Symmetrically distributed lateral airflow guides create mirrored hot air fields on both sides of the flushing needle axis, eliminating the material stress asymmetry problem caused by unilateral heating. This layout balances the heat input inside and outside the bending area, preventing springback deformation or microcracks caused by temperature differences. The symmetrical airflow also creates dynamic pressure balance around the needle body, preventing displacement caused by airflow impact during heating. For flushing needles with asymmetrical cross-sections, customized heating curves can be achieved by independently adjusting the airflow on both sides, expanding the equipment's process applicability. Furthermore, the symmetrical structure reduces the complexity of flow channel design, improving production reliability while reducing turbulence noise.

[0018] Preferably, multiple needle fixing devices are provided and symmetrically fixed to the mounting platform, and each needle fixing device is equipped with an independent bending actuator and air guide tube assembly.

[0019] The symmetrical arrangement of the multi-needle fixing device enables parallel processing capabilities, allowing multiple rinsing needles to be clamped simultaneously for continuous bending operations, significantly improving production efficiency. Each independently configured bending actuator and air duct assembly can be customized according to the specifications of different needles; for example, the heating temperature and bending force can be adjusted individually for rinsing needles of different diameters or materials. This design optimizes the equipment footprint through space reuse technology, while avoiding equipment idleness and wear during single-station operations. The modular architecture also supports rapid switching of production tasks; for example, in dental surgery where different patients require customized needle types urgently, multiple specifications can be processed simultaneously, shortening clinical response time.

[0020] Preferably, the airflow channel is configured as a curved and extended flow channel structure.

[0021] The curved, extended flow channel structure increases the airflow path length, prolonging the contact time between hot air and the heating element, allowing the air to fully absorb heat energy and improving heat conversion efficiency. The curvature design of the flow channel follows fluid dynamics principles, utilizing centrifugal force to guide the high-temperature airflow to the outside of the channel, avoiding overheating in the central area that would occur with a straight-through structure. The curved flow channel also reduces the axial component of the airflow velocity, promoting turbulence development and enhancing the mixing uniformity of the hot air at the outlet. This structure is particularly suitable for high-power heating applications, achieving stable high heat capacity output within a limited space while reducing the creep effect of localized high temperatures on the shell material.

[0022] Preferably, the working surface of the forming roller is provided with a friction-enhancing structure.

[0023] The friction-enhancing structure, through the microtexture of the roller's working surface or a composite material coating, increases the coefficient of friction between the roller and the irrigation needle surface, preventing relative slippage caused by material springback during bending. This design precisely transmits the propulsive force of the linear drive, ensuring synchronous movement between the forming roller and the needle body, and avoiding bending radius deviations due to slippage. The friction-enhancing layer also absorbs some vibration energy, reducing the risk of mechanical resonance during high-speed bending. For irrigation needles with different surface treatments, process adaptation can be achieved by replacing roller components with different coefficients of friction, improving the equipment's responsiveness to different clinical needs.

[0024] Preferably, the tapered connector adopts a standard Luer interface structure.

[0025] The standard Luer connector's tapered connection structure enables quick clamping and airtight fixation of the irrigation needle tip via a tapered fit, compatible with internationally recognized medical device interface standards. This design eliminates the rotational steps required for traditional threaded connections, simplifying the clamping process and preventing needle deformation due to overtightening. The Luer connector's self-locking characteristic maintains a stable connection during heating and bending, preventing loosening due to temperature changes. The standardized interface also supports plug-and-play compatibility with third-party irrigation needle accessories, expanding the device's application potential across brands and models, and reducing equipment procurement costs for medical institutions.

[0026] Preferably, the heating housing is provided with a heat insulation cover.

[0027] The heat shield uses multi-layered composite insulation material to encase the heating shell, effectively blocking the leakage of radiant and conductive heat, reducing the surface operating temperature of the equipment, and meeting the contact safety standards for medical devices. This structure concentrates heat energy within the airflow channel, reducing the interference of ambient temperature fluctuations on heating stability, while also reducing the heat dissipation load on the air conditioning system. The modular design of the heat shield facilitates regular cleaning of accumulated dust contaminants, maintaining the cleanliness of hot air and preventing harmful gases generated by the carbonization of impurities during heating. Furthermore, the external insulation layer also serves as an electromagnetic shielding structure, suppressing the impact of high-frequency interference from the heating element on surrounding medical electronic equipment.

[0028] The advantages of this utility model compared to the prior art are:

[0029] This invention relates to a hot air-heated dental irrigator bending device, addressing the problems of low efficiency, poor precision, insufficient versatility, uneven heating, and easy damage to the needle body during bending found in existing dental irrigator bending devices. The horizontal mounting platform of the base assembly provides a stable structural foundation for the entire device, ensuring precise spatial positioning of each functional module during operation. The needle fixing device, through a vertical fixing method combined with a positioning groove and a tapered connection structure, achieves bidirectional constraint of the irrigator needle in both the axial and circumferential directions, effectively avoiding forming errors caused by needle displacement during bending. The hot air heating device uses a multi-axial air outlet to form an annular hot air curtain, which can uniformly heat the area of ​​the irrigator needle to be bent, softening the material without damaging the needle surface coating. The height adjustment component and angle adjustment component of the bending actuator work together, allowing the operator to flexibly adjust the bending angle and forming radius according to clinical needs. The linear drive device, combined with a rotatable bending forming roller, reduces frictional resistance during force application, ensuring a smooth bending trajectory. The overall structural design balances operational efficiency and forming accuracy, making it suitable for the complex bending requirements of flushing needles of different specifications. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a structural diagram of a dental irrigation needle bending device based on hot air heating, according to an embodiment of the present invention.

[0032] Figure 2 This is a structural diagram from another perspective of a dental irrigation needle bending device based on hot air heating, according to an embodiment of the present invention.

[0033] Figure 3 for Figure 1 A magnified view of region A in the middle.

[0034] Figure 4 for Figure 2 A magnified view of region B in the middle.

[0035] Labeling Explanation: Base assembly (1), needle fixing device (2), positioning base plate (21), support plate (22), conical joint (23), hot air heating device (3), heating shell (31), air duct assembly (32), central guide pipe (321), side guide pipe (322), bending actuator (4), height adjustment assembly (41), guide column (411), guide rail (4111), lifting slide (412), slider (4121), locking mechanism (4122), angle adjustment assembly (42), rotary platform (421), linear drive device (43), bending forming roller (44). Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0038] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of this application, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0040] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0041] This embodiment provides a dental irrigation needle bending device based on hot air heating, including a base assembly 1, a needle fixing device 2, a hot air heating device 3, and a bending actuator 4. The base assembly 1 has a horizontally arranged mounting platform; the needle fixing device 2 is vertically fixed to the mounting platform and includes a positioning base plate 21, a support plate 22, and a tapered connector 23 arranged sequentially along the axial direction. The positioning base plate 21 has a positioning groove adapted to the contour of the irrigation needle base, and the tapered connector 23 has a tapered connection structure for detachably connecting the end of the irrigation needle; the hot air heating device 3 includes a heating shell 31 with an airflow channel. The electric heating element is installed in the airflow channel, and the air duct assembly 32 is connected to the airflow channel. The air duct assembly 32 has multiple air outlets with different axes at its end. Each air outlet forms an annular hot air curtain around the area to be bent by the flushing needle. The bending actuator 4 includes a vertically adjustable height adjustment component 41, an angle adjustment component 42 hinged to the height adjustment component 41, and a linear drive device 43 fixed to the end of the angle adjustment component 42. The telescopic end of the linear drive device 43 is provided with a bending forming roller 44 that can rotate around the axis of the flushing needle. The rim surface shape of the bending forming roller 44 is adapted to the diameter of the flushing needle.

[0042] The horizontal mounting platform of the base assembly 1 provides a stable structural foundation for the entire device, ensuring precise spatial positioning of each functional module during operation. The needle fixing device 2, through a vertical fixing method combined with positioning grooves and a tapered connection structure, achieves bidirectional constraint of the irrigation needle in both the axial and circumferential directions, effectively avoiding forming errors caused by needle displacement during bending. The hot air heating device 3 uses a ring-shaped hot air curtain formed by multi-axial air outlets to uniformly heat the area of ​​the irrigation needle to be bent, softening the material without damaging the needle surface coating. The height adjustment component 41 and angle adjustment component 42 of the bending actuator 4 work together, allowing the operator to flexibly adjust the bending angle and forming radius according to clinical needs. The linear drive device 43, in conjunction with the rotatable bending forming roller 44, reduces frictional resistance during force application, ensuring a smooth bending trajectory. The overall structural design balances operational efficiency and forming accuracy, making it suitable for the complex bending requirements of irrigation needles of different specifications.

[0043] In this embodiment, the air duct assembly 32 includes a central air duct 321 and at least one lateral air duct 322, with the air outlet of the central air duct 321 and the air outlet of the lateral air duct 322 arranged orthogonally.

[0044] The orthogonal arrangement of the central guide tube 321 and the lateral guide tubes 322 optimizes the hot air distribution pattern. The central guide tube 321 acts directly on the needle body axis region, while the lateral guide tubes 322 cover the lateral surfaces of the bending parts, forming a multi-dimensional heat conduction path. This design avoids the problems of local overheating or uneven heating caused by unilateral hot air, and is especially suitable for flushing needles with thin walls or irregular cross-sections. The turbulence effect generated by the superposition of orthogonal airflows can accelerate heat transfer efficiency, shorten heating time, and reduce the continuous power consumption of the heating element. In addition, the branched guide structure makes it easy to adjust the airflow distribution according to the thermal deformation characteristics of different materials. For example, the central airflow intensity can be enhanced for high melting point materials, while the local temperature gradient can be reduced through lateral airflow for heat-sensitive materials.

[0045] In this embodiment, the height adjustment component 41 includes a guide column 411 vertically fixed to the base component 1 and a lifting slide 412 slidably engaged with the guide column 411. The angle adjustment component 42 includes a rotary platform 421 rotatably connected to the lifting slide 412. The side wall of the guide column 411 is provided with an axially extending guide rail 4111. The lifting slide 412 is provided with a slider 4121 that fits into the guide rail 4111. The end of the slider 4121 is provided with a locking mechanism 4122.

[0046] The sliding engagement structure of the guide column 411 and the lifting slide 412 achieves stepless vertical adjustment through a high-precision guide rail pair. The interlocking design of the guide rail 4111 and the slider 4121 can counteract the lateral torque generated during bending, preventing the mechanism from wobbling. The rotary platform 421 adopts a hinged connection, allowing the angle adjustment component 42 to rotate freely within a large angle range. Combined with the locking mechanism 4122, it quickly fixes the target angle, ensuring consistency across multiple batches of bending operations. The modular design of the lifting slide 412 facilitates disassembly and maintenance, while the axial extension characteristic of the guide column 411 supports a wide range of height adjustments, adapting to the clamping requirements of flushing needles of different lengths. This mechanism, through the combination of mechanical constraints and dynamic adjustment, significantly reduces the skill threshold for manual operation and improves the repeatability of bending paths in complex spaces.

[0047] In this embodiment, the lateral guide tubes 322 are symmetrically distributed on both sides of the flushing needle axis.

[0048] The symmetrically distributed lateral airflow guides 322 create mirrored hot air fields on both sides of the flushing needle axis, eliminating the material stress asymmetry problem caused by unilateral heating. This layout balances the heat input inside and outside the bending area, preventing springback deformation or microcracks caused by temperature differences. The symmetrical airflow also creates dynamic pressure balance around the needle body, preventing the needle body from shifting due to airflow impact during heating. For flushing needles with asymmetrical cross-sections, customized heating curves can be achieved by independently adjusting the airflow on both sides, expanding the equipment's process applicability. Furthermore, the symmetrical structure reduces the complexity of flow channel design, improves production reliability, and reduces turbulence noise.

[0049] In this embodiment, there are multiple needle fixing devices 2, which are symmetrically fixed to the installation platform. Each needle fixing device 2 is equipped with an independent bending actuator 4 and an air duct group 32.

[0050] The symmetrical arrangement of the multi-needle fixing device 2 enables parallel processing capabilities, allowing multiple rinsing needles to be clamped simultaneously for continuous bending operations, significantly improving production efficiency. Each independently configured bending actuator 4 and air duct assembly 32 can be customized according to the specifications of different needles; for example, the heating temperature and bending force can be adjusted individually for rinsing needles of different diameters or materials. This design optimizes the equipment footprint through space reuse technology while avoiding equipment idleness and wear during single-station operations. The modular architecture also supports rapid switching of production tasks; for example, in dental surgery where different patients require customized needle types urgently, multiple specifications can be processed simultaneously, shortening clinical response time.

[0051] In this embodiment, the airflow channel is configured as a curved and extended flow channel structure, specifically a spiral or S-shape.

[0052] The curved, extended flow channel structure increases the airflow path length, prolonging the contact time between hot air and the heating element, allowing the air to fully absorb heat energy and improving heat conversion efficiency. The curvature design of the flow channel follows fluid dynamics principles, utilizing centrifugal force to guide the high-temperature airflow to the outside of the channel, avoiding overheating in the central area that would occur with a straight-through structure. The curved flow channel also reduces the axial component of the airflow velocity, promoting turbulence development and enhancing the mixing uniformity of the hot air at the outlet. This structure is particularly suitable for high-power heating applications, achieving stable high heat capacity output within a limited space while reducing the creep effect of localized high temperatures on the shell material.

[0053] In this embodiment, the working surface of the forming roller 44 is provided with a friction-enhancing structure.

[0054] The friction-enhancing structure, through the microtexture of the roller's working surface or a composite material coating, increases the coefficient of friction between the roller and the irrigation needle surface, preventing relative slippage caused by material springback during bending. This design precisely transmits the propulsive force of the linear drive device 43, ensuring synchronous movement between the forming roller 44 and the needle body, and avoiding bending radius deviations caused by slippage. The friction-enhancing layer also absorbs some vibration energy, reducing the risk of mechanical resonance during high-speed bending. For irrigation needles with different surface treatments, process adaptation can be achieved by replacing roller accessories with different coefficients of friction, improving the equipment's responsiveness to different clinical needs.

[0055] In this embodiment, the tapered connector 23 adopts a standard Luer interface structure.

[0056] The standard Luer connector's tapered connection structure enables quick clamping and airtight fixation of the irrigation needle tip via a tapered fit, compatible with internationally recognized medical device interface standards. This design eliminates the rotational steps required for traditional threaded connections, simplifying the clamping process and preventing needle deformation due to overtightening. The Luer connector's self-locking characteristic maintains a stable connection during heating and bending, preventing loosening due to temperature changes. The standardized interface also supports plug-and-play compatibility with third-party irrigation needle accessories, expanding the device's application potential across brands and models, and reducing equipment procurement costs for medical institutions.

[0057] In this embodiment, a heat insulation cover is provided outside the heating housing 31.

[0058] The heat shield uses multi-layered composite insulation material to encase the heating shell 31, effectively blocking the leakage of radiant and conductive heat, reducing the surface operating temperature of the equipment, and meeting the contact safety standards for medical equipment. This structure concentrates heat energy within the airflow channel, reducing the interference of ambient temperature fluctuations on heating stability, while also reducing the heat dissipation load of the air conditioning system. The modular design of the heat shield facilitates regular cleaning of accumulated dust contaminants, maintaining the cleanliness of hot air and preventing harmful gases generated by the carbonization of impurities during heating. In addition, the external insulation layer also serves as an electromagnetic shielding structure, suppressing the impact of high-frequency interference from the heating element on surrounding medical electronic equipment.

[0059] Additionally, it should be noted that although this embodiment does not include it, in other embodiments, a Venturi accelerator tube may be provided at the inlet of the air duct assembly, and a vortex generator containing circumferentially distributed inclined guide vanes may be provided at its throat position.

[0060] The Venturi accelerator tube increases airflow velocity through changes in throat cross-sectional area, allowing hot air to gain higher kinetic energy at the outlet. This enables the hot air to penetrate the air boundary layer on the flushing needle surface, enhancing thermal convection. The inclined guide vanes at the throat induce vortex motion in the airflow, breaking the laminar flow and increasing the contact time between the airflow and the heating element, thus improving thermal energy utilization. The circumferentially distributed vortex generator ensures uniform vortex distribution within the annular flow channel, avoiding localized cooling dead zones caused by airflow deviation. This combined structure achieves rapid heating and precise temperature control while reducing fan power requirements, making it particularly suitable for intermittent heating scenarios requiring frequent start-stop cycles, and reducing the impact of thermal inertia on bending process stability.

[0061] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dental irrigation needle bending apparatus based on hot air heating, characterized by, The utility model relates to a kind of needle bending machine, including Base assembly (1) with horizontally arranged mounting platform; Needle body fixing device (2) is vertically fixed to the mounting platform, including sequentially arranged positioning base plate (21), support vertical plate (22) and taper joint (23) along the axial direction, the positioning base plate (21) is equipped with the positioning groove adapted to the profile of flushing needle base, the taper joint (23) is equipped with tapering connection structure for detachably connecting the end of flushing needle; Hot air heating device (3) includes heating shell (31) provided with airflow channel, electric heating element arranged in airflow channel and air duct group (32) communicated with airflow channel, the end of air duct group (32) is provided with a plurality of different axial air outlets, each air outlet forms annular hot air curtain around the bending area of flushing needle; Bending execution mechanism (4) includes vertically adjustable height adjusting assembly (41), angle adjusting assembly (42) hinged with height adjusting assembly (41) and linear drive device (43) fixed to the end of angle adjusting assembly (42), the telescopic end of linear drive device (43) is provided with bending forming roller (44) rotatable around the axis of flushing needle, the rim surface shape of bending forming roller (44) is adapted to the diameter of flushing needle.

2. The hot air heating based dental irrigation needle bending apparatus according to claim 1, characterized in that, The air duct group (32) includes a central flow guide pipe (321) and at least one lateral flow guide pipe (322), the air outlet of the central flow guide pipe (321) is arranged orthogonally with the air outlet of the lateral flow guide pipe (322).

3. The hot air heating based dental irrigation needle bending apparatus according to claim 2, characterized in that, A Venturi accelerating pipe is arranged at the inlet of the air duct group (32), and a vortex generator including circumferentially distributed inclined guide vanes is arranged at the throat position of the Venturi accelerating pipe.

4. The hot air heating based dental irrigation needle bending apparatus as claimed in claim 1, wherein, The height adjusting assembly (41) includes a guide column (411) vertically fixed to the base assembly (1) and a lifting slide (412) in sliding cooperation with the guide column (411), and the angle adjusting assembly (42) includes a rotary platform (421) rotationally connected with the lifting slide (412); an axially extending guide rail (4111) is arranged on the side wall of the guide column (411), and the lifting slide (412) is provided with a sliding block (4121) embedded with the guide rail (4111), and a locking mechanism (4122) is arranged at the end of the sliding block (4121).

5. The hot air heating based dental irrigation needle bending apparatus as claimed in claim 2, wherein, The lateral flow guide pipes (322) are symmetrically distributed on both sides of the axis of the flushing needle.

6. The hot air heating based dental irrigation needle bending apparatus as claimed in claim 1, wherein, The needle body fixing device (2) is provided with a plurality of symmetrically fixed mounting platforms, and each needle body fixing device (2) is correspondingly provided with an independent bending execution mechanism (4) and an air duct group (32).

7. The hot air heating based dental irrigation needle bending apparatus as claimed in claim 1, wherein, The airflow channel is arranged in a curved and extended flow channel structure.

8. The hot air heating based dental irrigation needle bending apparatus as claimed in claim 1, wherein, The working surface of the forming roller (44) is provided with a friction-enhancing structure.

9. The hot air heating based dental irrigation needle bending apparatus as claimed in claim 1, wherein, The taper joint (23) adopts a standard luer connector structure.

10. The hot air heating based dental irrigation needle bending apparatus as claimed in claim 1, wherein, The heating shell (31) is externally provided with a heat shield.

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