阅读说明：本技术 一种变距双面牙刷的模拟方法 (Simulation method of variable-pitch double-sided toothbrush ) 是由 张驰 田欣 于 2020-12-17 设计创作，主要内容包括：本发明属于牙刷领域,具体涉及一种变距双面牙刷的模拟方法,其特征在于,包括以下步骤：步骤一,建立伪刚体模型模块；步骤二,建立伪刚体模型模块的输入输出位移方程；步骤三,构建仿真模型模块；步骤四,加工实物结构；步骤五,将伪刚体模型模块、仿真模型模块模拟并对比验证；或伪刚体模型模块、实物结构拟并对比验证；或仿真模型模块、实物结构模拟并对比验证；或伪刚体模型模块、仿真模型模块、实物结构模拟并对比验证。本发明实物结构开发过程高效、开发过程和验证能够同时完成,且实物结构能够实现双面牙刷两刷面间距离可变、活动刷头可伸缩。(The invention belongs to the field of toothbrushes, and particularly relates to a method for simulating a variable-pitch double-sided toothbrush, which is characterized by comprising the following steps of: step one, establishing a pseudo rigid body model module; establishing an input and output displacement equation of the pseudo rigid body model module; step three, constructing a simulation model module; step four, processing a real object structure; simulating the pseudo rigid body model module and the simulation model module, and comparing and verifying; or simulating a pseudo rigid body model module and a real object structure and comparing and verifying; or simulating the model module and the physical structure and comparing and verifying; or simulating and comparing and verifying the structures of the pseudo-rigid model module, the simulation model module and the real object. The object structure has high efficiency in the development process, and the development process and the verification can be completed simultaneously, and the object structure can realize the variable distance between two brush surfaces of the double-sided toothbrush and the telescopic movable brush head.)

1. A simulation method of a variable-pitch double-sided toothbrush is characterized by comprising the following steps:

step one, establishing a pseudo rigid body model module;

establishing an input and output displacement equation of the pseudo rigid body model module;

step three, constructing a simulation model module;

step four, processing a real object structure;

simulating the pseudo rigid body model module and the simulation model module, and comparing and verifying; or simulating a pseudo rigid body model module and a real object structure and comparing and verifying; or simulating the model module and the physical structure and comparing and verifying; or simulating and comparing and verifying the structures of the pseudo-rigid model module, the simulation model module and the real object.

2. The method for simulating a variable-pitch double-sided toothbrush according to claim 1, wherein: and step two, establishing an input and output displacement equation of the pseudo rigid body model module according to elasticity mechanics and Bernoulli-Euler hypothesis.

3. The method for simulating a variable-pitch double-sided toothbrush according to claim 1, wherein: processing a real object structure by adopting a finishing carving technology; and processing and manufacturing the selected plate, and selecting a cutter with a small radius for processing.

4. The method for simulating a variable-pitch double-sided toothbrush according to claim 1, wherein: and fifthly, simulating the influence of different loads on different nodes on the displacement amplitude and deformation of the variable pitch part.

5. The method for simulating a variable-pitch double-sided toothbrush according to claim 1, wherein the physical structure comprises:

a brush handle (1), wherein one end of the brush handle (1) is provided with a fixed brush head (2);

the distance-changing part (5) is arranged in the brush handle (1) and the fixed brush head (2), and the distance-changing part (5) can drive the movable brush head (6) to stretch;

the bristles (4) are respectively arranged on the fixed brush head (2) and the movable brush head (6).

6. The method of simulating a variable pitch two-sided toothbrush of claim 5, wherein: a brush holder hole (1-1) is arranged on the brush holder (1), and the pressing part of the distance-variable component (5) can be exposed out of the brush holder hole (1-1).

7. The method of simulating a variable pitch two-sided toothbrush of claim 5, wherein: the fixed brush head (2) is internally provided with a fixed brush head hole (2-1), and the movable brush head (6) can be driven by the variable-pitch part (5) to stretch in the direction of the fixed brush head hole (2-1).

8. The method of simulating a variable pitch two-sided toothbrush of claim 5, wherein: the movable brush head (6) and the brush handle cover (3) can be detachably buckled and connected.

9. The method of simulating a variable pitch two-sided toothbrush of claim 5, wherein: the pitch-variable part (5) comprises a first pitch-variable part (5-1), a second pitch-variable part (5-2), a third pitch-variable part (5-3) and a fourth pitch-variable part (4-4), and the first pitch-variable part (5-1), the second pitch-variable part (5-2), the third pitch-variable part (5-3) and the fourth pitch-variable part (4-4) are arranged on the brush handle (1); the first pitch-changing component (5-1) is hinged with the second pitch-changing component (5-2), the second pitch-changing component (5-2) is hinged with the third pitch-changing component (5-3), and the third pitch-changing component (5-3) is hinged with the fourth pitch-changing component (5-4).

10. The method of simulating a variable pitch two-sided toothbrush of claim 5, wherein: the variable-pitch part (5) comprises a fifth variable-pitch part (5-5) and a sixth variable-pitch part (5-6), the fourth variable-pitch part (5-4) is hinged with the fifth variable-pitch part (5-5), the fifth variable-pitch part (5-5) is hinged with the sixth variable-pitch part (5-6), and the sixth variable-pitch part (5-6) is connected with the movable brush head (6).

Technical Field

The invention belongs to the field of toothbrushes, and particularly relates to a method for simulating a variable-pitch double-sided toothbrush.

Background

The traditional mechanism is formed by connecting rigid components by kinematic pairs. There are many disadvantages such as vibration due to inertia, clearance by a kinematic pair, friction, wear, and lubrication, machining, mounting error, etc. depending on the mechanical structure. The flexible mechanism (also called as flexible mechanism, English name is compliant mechanism) mainly relies on the elastic deformation of flexible construction in the mechanism to realize the main function of the mechanism, and has the advantages of small size, high sensitivity, simple and convenient processing, no friction and wear, low manufacturing cost and the like, thereby being widely applied to the fields of precision positioning, MEMS and the like.

The kinds of toothbrushes are classified into single-sided toothbrushes, double-sided toothbrushes, electric toothbrushes, and the like, from the viewpoint of the structure of the toothbrush. The single-sided toothbrush is most commonly used in our lives, is convenient to use and low in price, but is difficult to brush the inner surfaces of teeth; the existing double-sided toothbrush is inconvenient to use due to some structural defects, and is not very common due to much inconvenience in use; the electric toothbrush is expensive, cannot be accepted by many people and has harsh use conditions, so the electric toothbrush cannot be well popularized;

particularly, the single-sided toothbrush used in daily life at present cannot realize bidirectional cleaning of the inner surface layer and the outer surface layer of teeth, the structural design of the double-sided toothbrush cannot be adjusted, the double-sided toothbrush lacks elasticity and flexibility, and is difficult to adapt to different oral cavity sizes, the double-sided toothbrush surfaces are not clamped too tightly, or the intervals are too large, so that oral cavity tooth stains cannot be removed, the double-sided toothbrush is inconvenient to apply, the rotating speed of the electric toothbrush is too high, certain abrasion is caused to teeth, and the manufacturing cost is high; therefore, the toothbrush with low price, convenient use and comprehensive functions is the goal pursued by people.

However, the physical improvement of the manufacture is directly implemented, the process and the steps of the structure improvement are complex, and a large amount of manpower and material resources are consumed. Therefore, the simulation method of the variable-pitch double-sided toothbrush is applied to the improvement of the toothbrush structure in daily life, can design a novel double-sided variable-pitch toothbrush, and applies the variable pitch to the design of the toothbrush structure, thereby solving the problems of over-complex toothbrush structure and over-high cost, overcoming the functional defects of the existing single-sided toothbrush and double-sided toothbrush, saving a large amount of manpower and material resources, simplifying the improvement process, and simultaneously completing the development and verification.

Disclosure of Invention

In order to solve the technical problems, the invention provides a variable-pitch double-sided toothbrush simulation method which can realize a real object structure with a variable distance between two brushing surfaces and a telescopic head part, has a high-efficiency development process of the real object structure, and can complete the development process and verification at the same time.

The technical scheme of the invention is as follows:

a simulation method of a variable-pitch double-sided toothbrush comprises the following steps:

step one, establishing a pseudo rigid body model module;

establishing an input and output displacement equation of the pseudo rigid body model module;

step three, constructing a simulation model module (which can be based on finite element analysis);

step four, processing a real object structure;

simulating the pseudo rigid body model module and the simulation model module, and comparing and verifying; or simulating and comparing and verifying the pseudo rigid body model module and the real object structure; or simulating the model module and the physical structure and comparing and verifying; or simulating and comparing and verifying the structures of the pseudo-rigid model module, the simulation model module and the real object.

Further, step two, the input and output displacement equation of the pseudo rigid body model module is established according to elasticity mechanics and Bernoulli-Euler hypothesis.

Step four, processing the material object structure by adopting a finishing impression technology; the selected plate is processed and manufactured, and a cutter with a small radius is selected for processing (so as to improve the surface quality of the workpiece, avoid the defects of surface fine lines, stress concentration and the like, and greatly prolong the service life of the mechanism).

Further, in the fifth step, the influence of different loads on different nodes on the displacement amplitude and deformation of the pitch-variable component is simulated (on the basis of determining basic properties such as unit type, real constant, material characteristics, cross section type and unit coordinate system, the influence of different loads on different nodes on the displacement amplitude and deformation of the mechanism is simulated).

Further, the object structure includes:

a brush handle (1), wherein one end of the brush handle (1) is provided with a fixed brush head (2);

the distance-changing part (5) is arranged in the brush handle (1) and the fixed brush head (2), and the distance-changing part (5) can drive the movable brush head (6) to stretch;

the bristles (4) are respectively arranged on the fixed brush head (2) and the movable brush head (6).

Furthermore, a brush handle hole (1-1) is arranged on the brush handle (1), and the pressing part of the distance-changing component (5) can be exposed out of the brush handle hole (1-1).

Furthermore, a fixed brush head hole (2-1) is formed in the fixed brush head (2), and the movable brush head (6) can be driven to stretch in the direction of the fixed brush head hole (2-1) by the distance-changing component (5).

Furthermore, the movable brush head (6) and the brush handle cover (3) can be detachably buckled and connected.

Furthermore, the pitch-variable part (5) comprises a first pitch-variable part (5-1), a second pitch-variable part (5-2), a third pitch-variable part (5-3) and a fourth pitch-variable part (4-4), wherein the first pitch-variable part (5-1), the second pitch-variable part (5-2), the third pitch-variable part (5-3) and the fourth pitch-variable part (4-4) are arranged on the brush handle (1); the first distance changing component (5-1) is hinged with the second distance changing component (5-2), the second distance changing component (5-2) is hinged with the third distance changing component (5-3), the third distance changing component (5-3) is hinged with the fourth distance changing component (5-4), the pressing part of the distance changing component (5) comprises the second distance changing component (5-2) and the third distance changing component (5-3), and the second distance changing component (5-2) and the third distance changing component (5-3) can expose the brush handle empty hole (1-1). The other end of the first distance-changing component (5-1) is connected with the inner end wall of the brush handle (1) through a spring (5-7).

Furthermore, the distance-changing part (5) comprises a fifth distance-changing part (5-5) and a sixth distance-changing part (5-6), the fourth distance-changing part (5-4) is hinged with the fifth distance-changing part (5-5), the fifth distance-changing part (5-5) is hinged with the sixth distance-changing part (5-6), and the sixth distance-changing part (5-6) is connected with the movable brush head (6). The sixth distance-changing component (5-6) can stretch in the direction of the fixed brush head hole (2-1). A space for the fifth distance-changing component (5-5) to move is arranged in the fixed brush head (2).

Furthermore, the sixth distance-changing component (5-6) is detachably connected with the movable brush head (6). The sixth distance-changing component (5-6) is made of elastic materials.

Further, the toothbrush comprises a shell, and the shell can be used for accommodating the fixed brush head and the movable brush head.

The invention has the beneficial effects that:

1. through the simulation of the dual working conditions of the pseudo-rigid model module and the simulation model module: the optimization design of mechanism parameters is realized by comparing and analyzing different parameters of the pseudo-rigid model module and the simulation model module, basic factors influencing the use efficiency and the service life of the mechanism are identified, and the performance and the service life of a workpiece are improved by optimizing the parameters.

2. The object structure of the invention is that one side of the brush hair is fixed, the other side of the brush hair is movable, and the distance between the two brush hairs of the toothbrush can be changed to adapt to the characteristics of different shapes and sizes of human teeth. The distance-variable component can realize the functions of variable distance between two brushing surfaces and telescopic head of the double-sided toothbrush, and the double-sided toothbrush has the characteristics of convenience in processing, strong practicability and low manufacturing cost. Because the movable brush head can be replaced, a user can replace the movable brush head and the brush handle cover according to actual needs, so that the toothbrush is convenient to clean, the service life of the toothbrush is prolonged, and residual dirt on the inner side of teeth is better clarified.

Drawings

FIG. 1 is a schematic diagram of a pseudo-rigid model module according to the present invention;

FIG. 2 is a schematic view of a model of the overall construction of the toothbrush of the present invention without the toothbrush being depressed;

FIG. 3 is a schematic view of a model of the overall structure of the toothbrush of the present invention as it is depressed;

FIG. 4 is a schematic view of the pitch change member of the present invention shown not pressed;

FIG. 5 is a schematic view of the pitch change member of the present invention as it is depressed;

FIG. 6 is a schematic view of the model of the present invention during brushing;

wherein, 1: 1-1 of brush handle: handle hole, 2: fixed brush head, 2-1: fixed brush head hole, 3: brush handle cover, 4: bristles, 5: pitch-variable part, 5-1: first pitch member, 5-2: second pitch member, 5-3: third pitch member, 5-4: fourth pitch member, 5-5: fifth pitch member, 5-6: sixth pitch member, 5-7: spring, 6: movable brush head, 6-1: locking portion, 7: a tooth.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

A simulation method of a variable-pitch double-sided toothbrush comprises the following steps:

step one, establishing a pseudo rigid body model module;

establishing an input and output displacement equation of the pseudo rigid body model module;

step three, constructing a simulation model module (which can be based on finite element analysis);

step four, processing a real object structure;

simulating the pseudo rigid body model module and the simulation model module, and comparing and verifying; or simulating and comparing and verifying the pseudo rigid body model module and the real object structure; or simulating the model module and the physical structure and comparing and verifying; or simulating and comparing and verifying the structures of the pseudo-rigid model module, the simulation model module and the real object.

Further, step two, the input and output displacement equation of the pseudo rigid body model module is established according to elasticity mechanics and Bernoulli-Euler hypothesis.

Step four, processing the material object structure by adopting a finishing impression technology; the selected plate is processed and manufactured, and a cutter with a small radius is selected for processing (so as to improve the surface quality of the workpiece, avoid the defects of surface fine lines, stress concentration and the like, and greatly prolong the service life of the mechanism).

Further, in the fifth step, the influence of different loads on different nodes on the displacement amplitude and deformation of the pitch-variable component is simulated (on the basis of determining basic properties such as unit type, real constant, material characteristics, cross section type and unit coordinate system, the influence of different loads on different nodes on the displacement amplitude and deformation of the mechanism is simulated).

According to the shape and thickness of human teeth, the thinnest incisor teeth and the thickest groove teeth in each tooth of a human are about 2-4mm and 6-8mm, so that the initial distance between two bristles of the double-sided variable-pitch toothbrush is 4mm, the maximum working distance is 9-10mm, and the moving distance of the movable brushing surface is 5-6 mm. The displacement of the movable brush head in the moving direction is taken as a research object, and when the input force reaches a certain value, the design target is reached if the displacement is 5-6 mm. Based upon the design goals set forth above, depending upon the particular application and processing conditions. The structure, the size and various parameters of each part of the variable-pitch component of the variable-pitch double-sided toothbrush are designed, and the variable-pitch component is shown in figures 4-5.

The double-sided variable-pitch toothbrush and the parts thereof are integrally and physically molded by three-dimensional molding software (such as an Inventor or other three-dimensional software), and a three-dimensional model of the double-sided variable-pitch toothbrush is shown in fig. 2. The appearance of the movable brush head and the brush handle is designed according to the structure of a common single-sided toothbrush, and the internal structure is designed according to the shape and the size of the variable mechanism. The brush hair is divided into two parts, one part is the outer brush hair attached to the fixed brush head at one end of the brush handle and used for cleaning the outer surface of teeth, the arrangement of the brush hair is similar to that of a common single-sided toothbrush, the other part is the inner brush hair attached to the movable brush head, and the arrangement condition of the inner brush hair is designed according to the shape of tooth sockets and the size distribution of the teeth.

The movable brush head is arranged at one end of the variable-pitch part, one side of the variable-pitch part is connected with the movable brush head, and the other side of the variable-pitch part is connected with the brush handle (namely the fixed brush head). In order to perfect the design, the three-dimensional entity model of the integral structure of the teeth is established according to the size, the layout and the shape of the teeth in the oral cavity of a human body while the three-dimensional entity model of the integral structure of the double-sided variable-pitch toothbrush is established. Whether the variable pitch function of the virtual double-sided variable pitch toothbrush meets the practical application or not is judged by comparing the variable pitch of the oral cavity tooth model with the variable pitch of the brush head of the double-sided variable pitch toothbrush, and the oral cavity tooth model and the double-sided variable pitch toothbrush are in a pair as shown in fig. 6.

And simulating different stresses of the pseudo rigid body model module by adopting the method in the specification to obtain the rotation angle theta 2 of the rod 2 and the displacement of each slide block when the load F changes. And (4) calculating by using MATLAB to obtain the change condition of theta 2 and the displacement of the slide block 4 and the slide block 6 when the input force F is different. To achieve a maximum displacement of the slide 6 in the mechanism in the range 5-6mm under a suitably large force and to ensure that the mechanism has a suitable service life, theta is finally selected herein₂₀60 ° as shown in figure 1.

Because the manufacturing (not shown) is carried out after the design is finished, according to the actual conditions of the machining center, the manufacturing is carried out according to the basic process of plane finishing carving, the plane finishing carving is carried out by adopting a plate with the thickness of ABS plastic as a processing material being b-3 mm, and the thickness of each part of the variable-pitch part is the thickness of the ABS plastic plate.

The comparison of the double simulation results of the pseudo-rigid model module and the simulation model module shows that the parameter curves of the two models are relatively identical, and the correctness of theoretical modeling and simulation analysis can be preliminarily verified.

Pseudo rigid body (theoretical) model calculation result delta_θThe error range of the pseudo rigid body (theoretical) model calculation is 9.170% -5%, and the result delta of the pseudo rigid body (theoretical) model calculation_x1The error range is 14.29% -5.26%, and the result delta of pseudo-rigid body (theoretical) model calculation_y1The error range is 6.25% -2.78%; simulation model result Δ x₂The error range is 28.03% -2.02%, and the simulation model module result is delta_y2The error range is 6.00% -3.12%. The calculated result delta of the rigid body (theoretical) model for eliminating the pseudo errors_x1Besides large errors, other errors are in a reasonable range, and theoretical model analysis is correct.

By simulating the working condition of the processed test piece, which is equivalent to 2 stages of operation in the morning and evening every day, the test piece is subjected to target motion test in each stage, so that the displacement of the movable slide block 6 of the test piece reaches 5-6mm, and the test is repeated for 40 times. The working life of the test piece can be known to be about 65-85 days through repeated tests, and the mechanism is proved to meet the actual life requirement according to the habit that people use toothbrushes to replace the toothbrush once in two months, namely about 60 days, and the structural design and the theoretical analysis of the mechanism are further proved to be reasonable.

The object structure includes:

a brush handle (1), wherein one end of the brush handle (1) is provided with a fixed brush head (2);

the distance-changing part (5) is arranged in the brush handle (1) and the fixed brush head (2), and the distance-changing part (5) can drive the movable brush head (6) to stretch;

the bristles (4) are respectively arranged on the fixed brush head (2) and the movable brush head (6).

Furthermore, a brush handle hole (1-1) is arranged on the brush handle (1), and the pressing part of the distance-changing component (5) can be exposed out of the brush handle hole (1-1). The fixed brush head (2) is internally provided with a fixed brush head hole (2-1), and the movable brush head (6) can be driven by the variable-pitch part (5) to stretch in the direction of the fixed brush head hole (2-1). The movable brush head (6) and the brush handle cover (3) can be detachably buckled and connected.

Furthermore, the pitch-variable part (5) comprises a first pitch-variable part (5-1), a second pitch-variable part (5-2), a third pitch-variable part (5-3) and a fourth pitch-variable part (4-4), wherein the first pitch-variable part (5-1), the second pitch-variable part (5-2), the third pitch-variable part (5-3) and the fourth pitch-variable part (4-4) are arranged on the brush handle (1); the first distance changing component (5-1) is hinged with the second distance changing component (5-2), the second distance changing component (5-2) is hinged with the third distance changing component (5-3), the third distance changing component (5-3) is hinged with the fourth distance changing component (5-4), the pressing part of the distance changing component (5) comprises the second distance changing component (5-2) and the third distance changing component (5-3), and the second distance changing component (5-2) and the third distance changing component (5-3) can expose the brush handle empty hole (1-1). The other end of the first distance-changing component (5-1) is connected with the inner end wall of the brush handle (1) through a spring (5-7).

Furthermore, the distance-changing part (5) comprises a fifth distance-changing part (5-5) and a sixth distance-changing part (5-6), the fourth distance-changing part (5-4) is hinged with the fifth distance-changing part (5-5), the fifth distance-changing part (5-5) is hinged with the sixth distance-changing part (5-6), and the sixth distance-changing part (5-6) is connected with the movable brush head (6). The sixth distance-changing component (5-6) can stretch in the direction of the fixed brush head hole (2-1). A space for the fifth distance-changing component (5-5) to move is arranged in the fixed brush head (2). The sixth distance-changing component (5-6) is detachably connected with the movable brush head (6). The sixth distance-changing component (5-6) is made of elastic materials. Comprises a shell, wherein the shell can be used for accommodating a fixed brush head and a movable brush head.

The variable structure and the size of the variable-pitch part are determined by taking double cleaning of the inner surface and the outer surface of teeth as targets according to the oral cavity structure of a human body, and the designed double-sided toothbrush can achieve the targets and meet the oral cavity structure through repeated simulation; model processing, adopting plane finishing impression and small-bore processing technique to optimize performance and beautify appearance, research and development efficiency is high, can find out the synchronization that research and development and verification can be accomplished in flexible concrete size, the physical structure manufacturing process fast.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example although embodiments of the 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 the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.