阅读说明：本技术 检测辅助装置以及软质发泡件软硬度的检测方法 (Detection auxiliary device and method for detecting hardness of soft foaming hardware ) 是由 孙全锦 张恒昱 李庚袁 贺茂 邓汉昌 宁敏清 于 2021-07-28 设计创作，主要内容包括：本发明公开一种检测辅助装置以及软质发泡件软硬度的检测方法,检测辅助装置包括底座、固定柱、绕柱以及检测带,底座的一侧设有立柱,立柱的外侧用于供软质发泡件固定；固定柱与立柱并列且间隔地设置于底座；绕柱与立柱并列且间隔地设置于底座；检测带用于环绕在被固定于立柱上的软质发泡件的外侧,检测带具有相对设置的第一端和第二端,第一端与固定柱连接,第二端穿过绕柱与立柱之间的间隙后向远离立柱的方向延伸,检测带被设置为在第二端受外力拉动时,能够挤压软质发泡件以相对远离立柱。本发明旨在量化软质发泡件的软硬度。(The invention discloses a detection auxiliary device and a method for detecting the hardness of a soft foaming piece, wherein the detection auxiliary device comprises a base, a fixed column, a winding column and a detection belt, wherein one side of the base is provided with an upright column, and the outer side of the upright column is used for fixing the soft foaming piece; the fixing columns and the upright columns are arranged in parallel and are arranged on the base at intervals; the winding column is arranged in parallel with the upright column and is arranged on the base at intervals; detect the area and be used for encircling in the outside that is fixed in the soft foaming spare on the stand, detect the area and have relative first end and the second end that sets up, first end is connected with the fixed column, and the second end passes and extends around the direction of keeping away from the stand behind the clearance between post and the stand, detects the area and is set up to holding when external force pulling at the second, can extrude soft foaming spare with relative keeping away from the stand. The invention aims to quantify the hardness of soft foaming hardware.)

1. The utility model provides a detect auxiliary device for the soft or hard degree that supplementary detection soft foaming piece, its characterized in that includes:

the device comprises a base, wherein one side of the base is provided with an upright post, and the outer side of the upright post is used for fixing a soft foaming piece;

the fixing columns are arranged in parallel with the upright columns and are arranged on the base at intervals;

the winding column is arranged on the base in parallel with the upright column at intervals; and the number of the first and second groups,

the detection belt is used for surrounding the outer side of a soft foaming piece fixed on the upright post, the detection belt is provided with a first end and a second end which are arranged oppositely, the first end is connected with the fixed post, the second end penetrates through a gap between the wound post and the upright post and then extends towards the direction far away from the upright post, and the detection belt is arranged to be capable of extruding the soft foaming piece to be far away from the upright post relatively when the second end is pulled by external force.

2. The detection auxiliary device of claim 1, wherein the fixed column is spaced from the upright at a distance D1, and the winding column is spaced from the upright at a distance D2, D1 being D2.

3. The detection aid of claim 1, wherein the winding post is a cylinder; and/or the presence of a gas in the gas,

the upright post and the winding post are arranged in parallel; and/or the presence of a gas in the gas,

the stand has the fixed side that is used for fixing soft foaming spare and with the free side that fixed side set up relatively, fixed column and wind the post and be located the free side of stand.

4. The detection aid of claim 1, further comprising a securing structure for securing the soft foam to the post.

5. The auxiliary detection device according to claim 4, wherein the fixing structure comprises two pressing spring pieces, the two pressing spring pieces are respectively arranged corresponding to two ends of the soft foaming member, one end of each pressing spring piece is fixed on the outer side of the upright post through a bolt, the other end of each pressing spring piece and the outer side of the upright post are separated to form a clamping groove, the clamping groove is used for clamping the end portion of the soft foaming member, and the other end of each pressing spring piece can be elastically deformed in a direction close to or far away from the upright post so as to elastically press the soft foaming member in the clamping groove.

6. A method for detecting the hardness of soft foaming hardware is characterized by comprising the following steps:

a step S10 of providing the detection aid of any one of claims 1 to 5 and a soft foamed member;

step S20, fixing the soft foaming piece on the outer side of the upright post, and winding the detection belt on the outer side of the soft foaming piece;

step S30, pulling the second end with a preset force until the second end can not move, so as to obtain the movement duration of the detection belt;

and step S40, quantifying the hardness of the soft foaming hardware according to the movement duration.

7. The method for detecting the hardness of soft foam hardware according to claim 6, wherein step S40 includes:

step S41, acquiring the corresponding relation among the movement duration, the preset force and the hardness and hardness grade;

and step S42, based on the corresponding relation, judging the hardness and softness grade of the soft foaming hardware according to the movement duration.

8. The method for detecting the hardness of soft foam hardware according to claim 7, wherein step S30 is preceded by the steps of:

step S31, acquiring a dragging force sequence, wherein the dragging force sequence comprises a plurality of force values which are sequentially arranged according to the size, and each force value corresponds to a maximum movement duration;

step S32, selecting a force value, and using the force value to pull the second end until the second end can not move, so as to obtain the movement duration of the detection belt;

step S33, when the movement duration is longer than the maximum movement duration, selecting the larger adjacent force value as the force value, and repeating the step S32;

step S34, when the movement duration is equal to 0, selecting the adjacent smaller force value as the force value, and repeating the step S32;

and step S35, when the movement time length is not more than the maximum movement time length and is not equal to 0, setting the force value as a preset force.

9. The method for detecting the hardness of soft foam hardware according to claim 8, wherein step S41 includes:

under the condition that the preset force is N;

when the movement time length is more than 0s and less than or equal to 1s, the hardness grade is soft N-A;

when the movement time t is more than 1s and less than or equal to 1.5s, the hardness-softness grade is soft N-B;

and when the movement time t is more than 1.5s and less than or equal to 2s, the hardness-softness grade is soft N-C.

10. The method for detecting the hardness of a soft foam hardware as claimed in claim 6, wherein in step S10, said soft foam hardware comprises a body and two fixing lugs, said body is square, said fixing lugs are respectively disposed on two opposite sides of said body, and said fixing lugs are integrally formed with said body.

Technical Field

The invention relates to the technical field of automobile detection, in particular to a detection auxiliary device and a method for detecting the hardness of soft foaming hardware.

Background

Components within automobiles are constantly seeking to provide a better ride and feel experience for customers. Among them, the comfort of sitting and touching is an important concern of people, and most of the related parts such as seats, instrument desks, door panels and the like use soft foam pieces to provide good feeling for customers. Only aiming at the hardness of the foaming hardware, a feasible and accurate evaluation system is not established at present.

Disclosure of Invention

The invention mainly aims to provide a detection auxiliary device and a method for detecting the hardness of soft foaming hardware, aiming at quantifying the hardness of the soft foaming hardware.

In order to achieve the above object, the present invention provides a detection assisting device for assisting in detecting the hardness of a soft foam piece, the detection assisting device comprising:

the device comprises a base, wherein one side of the base is provided with an upright post, and the outer side of the upright post is used for fixing a soft foaming piece;

the fixing columns are arranged in parallel with the upright columns and are arranged on the base at intervals;

the winding column is arranged on the base in parallel with the upright column at intervals; and the number of the first and second groups,

the detection belt is used for surrounding the outer side of a soft foaming piece fixed on the upright post, the detection belt is provided with a first end and a second end which are arranged oppositely, the first end is connected with the fixed post, the second end penetrates through a gap between the wound post and the upright post and then extends towards the direction far away from the upright post, and the detection belt is arranged to be capable of extruding the soft foaming piece to be far away from the upright post relatively when the second end is pulled by external force.

Optionally, the fixed column is spaced from the upright column by a distance D1, and the winding column is spaced from the upright column by a distance D2, D1 being D2.

Optionally, the winding post is a cylinder; and/or the presence of a gas in the gas,

the upright post and the winding post are arranged in parallel; and/or the presence of a gas in the gas,

the upright post is provided with a fixed side for fixing the soft foaming piece and a free side opposite to the fixed side;

the fixed column and the winding column are positioned on the free side of the upright column.

Optionally, the fixing structure is used for fixing the soft foaming piece to the upright post.

Optionally, the fixing structure includes two pressing elastic pieces, the two pressing elastic pieces are respectively disposed corresponding to two ends of the soft foaming member, one end of each pressing elastic piece is fixed to the outer side of the stand column through a bolt, the other end of each pressing elastic piece and the outer side of the stand column form a clamping groove at an interval, the clamping groove is used for clamping the end portion of the soft foaming member, and the other end of each pressing elastic piece is elastically deformable in a direction close to or away from the stand column to elastically press the soft foaming member located in the clamping groove.

In addition, the invention also provides a method for detecting the hardness of the soft foaming hardware, which comprises the following steps:

step S10, providing the detection aid and the soft foamed member as described above;

step S20, fixing the soft foaming piece on the outer side of the upright post, and winding the detection belt on the outer side of the soft foaming piece;

step S30, pulling the second end with a preset force until the second end can not move, so as to obtain the movement duration of the detection belt;

and step S40, quantifying the hardness of the soft foaming hardware according to the movement duration.

Optionally, step S40 includes:

step S41, acquiring the corresponding relation among the movement duration, the preset force and the hardness and hardness grade;

and step S42, based on the corresponding relation, judging the hardness and softness grade of the soft foaming hardware according to the movement duration.

Optionally, step S30 is preceded by:

step S31, acquiring a dragging force sequence, wherein the dragging force sequence comprises a plurality of force values which are sequentially arranged according to the size, and each force value corresponds to a maximum movement duration;

step S32, selecting a force value, and using the force value to pull the second end until the second end can not move, so as to obtain the movement duration of the detection belt;

step S33, when the movement duration is longer than the maximum movement duration, selecting the larger adjacent force value as the force value, and repeating the step S32;

step S34, when the movement duration is equal to 0, selecting the adjacent smaller force value as the force value, and repeating the step S32;

and step S35, when the movement time length is not more than the maximum movement time length and is not equal to 0, setting the force value as a preset force.

Optionally, step S41 includes:

under the condition that the preset force is N;

when the movement time length is more than 0s and less than or equal to 1s, the hardness grade is soft N-A;

when the movement time t is more than 1s and less than or equal to 1.5s, the hardness-softness grade is soft N-B;

and when the movement time t is more than 1.5s and less than or equal to 2s, the hardness-softness grade is soft N-C.

Optionally, in step S10, the soft foaming piece includes a body and two fixing lugs, the body is square, the fixing lugs are respectively disposed on two opposite sides of the body, and the fixing lugs and the body are integrally formed.

According to the technical scheme, the detection auxiliary device comprises a base, a fixed column, a winding column and a detection belt, when the soft foaming hardware is subjected to soft hardness detection, the soft foaming hardware is arranged between the detection belt and the upright column and fixed on the outer side of the upright column, then the second end of the detection belt is pulled, the soft foaming hardware can be deformed, when the detection belt is pulled to extrude the outer side of the detection belt, the length of the detection belt which can be pulled and moved is increased until the soft foaming hardware is deformed to the limit, at the moment, the detection belt cannot be pulled and moved continuously, the soft foaming hardware can be visually and accurately known by measuring the time from pulling to stopping moving of the detection belt, and due to the fact that the time can be accurately counted, the soft hardness evaluation can be quantized, the soft hardness evaluation of the soft foaming hardware is accurate and objective, and artificial subjective factors and abstract similar soft, soft and objective soft foaming are avoided, Poor communication due to a hard evaluation result. In addition, the detection method is simple to operate, and the related detection auxiliary device is simple in structure, easy to process and beneficial to popularization.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of an embodiment of a detection assisting apparatus according to the present invention in a detection state;

FIG. 2 is a schematic view of the auxiliary detection device in FIG. 1 with the detection belt removed;

fig. 3 is a schematic structural view of the soft foamed member shown in fig. 1.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				1	Base seat	6	Detection belt
2	Upright post	10	Soft foamed article
				3	Fixing column	11	Body
4	Winding column	12	Fixing ear
				5	Compressing spring piece

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

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 of the present invention, 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Components within automobiles are constantly seeking to provide a better ride and feel experience for customers. Among them, the comfort of sitting and touching is an important concern of people, and most of the related parts such as seats, instrument desks, door panels, etc. use soft foaming parts (such as sponge) to provide better feeling for customers. Only aiming at the hardness of the foaming hardware, a feasible and accurate evaluation system is not established at present.

In view of this, the present invention provides an auxiliary detection device, which includes a base 1, a fixing column 3, a winding column 4 and a detection belt 6, can be used for detecting the hardness of a soft foaming component 10, and has a simple structure, easy processing and convenient operation. Fig. 1 and fig. 2 show an embodiment of the detection assistance device according to the present invention.

Referring to fig. 1 and 2, the auxiliary detection device includes a base 1, a fixed column 3, a winding column 4, and a detection belt 6. One side of the base 1 is provided with a stand column 2, and the outer side of the stand column 2 is used for fixing a soft foaming piece 10; the fixing columns 3 are arranged in parallel with the upright columns 2 and are arranged on the base 1 at intervals; the winding column 4 is arranged in parallel with the upright column 2 and is arranged on the base 1 at intervals; the detection belt 6 is used for surrounding the outer side of a soft foaming piece 10 fixed on the upright post 2, the detection belt 6 is provided with a first end and a second end which are oppositely arranged, the first end is connected with the fixed post 3, the second end passes through a gap between the winding post 4 and the upright post 2 and then extends towards the direction far away from the upright post 2, and the detection belt 6 is arranged to be capable of extruding the soft foaming piece 10 to be relatively far away from the upright post 2 when the second end is pulled by external force.

In the technical scheme of the invention, the detection auxiliary device comprises a base 1, a fixed column 3, a winding column 4 and a detection belt 6, when the soft foaming piece 10 is subjected to soft hardness detection, the soft foaming piece 10 is arranged between the detection belt 6 and the upright column 2 and fixed on the outer side of the upright column 2, then the second end of the detection belt 6 is pulled, because the soft foaming piece 10 can deform, when the detection belt 6 is pulled to extrude the outer side of the detection belt, the length of the detection belt 6 which can be pulled and moved is increased until the soft foaming piece 10 deforms to the limit, at the moment, the detection belt 6 cannot be pulled and moved continuously, through measuring the time from pulling and moving to stopping moving of the detection belt 6, the soft hardness of the soft foaming piece 10 can be intuitively and accurately known, and because the time can be accurately counted, the soft hardness evaluation can be quantized, and the soft hardness evaluation of the soft foaming piece 10 is accurate, Objectively, bad communication caused by artificial subjective factors and abstract similar soft and hard evaluation results is avoided. In addition, the detection method is simple to operate, and the related detection auxiliary device is simple in structure, easy to process and beneficial to popularization.

The base 1 is used for installing the upright column 2, the fixing column 3 and the winding column 4, and the upper surface of the base 1 can be arranged to be a plane for processing. The specific shape of the base 1 has various arrangements, for example, circular, square, etc. The specific shape of the upright post 2 can be arranged in various ways, such as a round post, a prism, etc., preferably, in this embodiment, the upright post 2 is a round post, so as to avoid the damage of the edge of the fixed post 3 to the soft sponge body when the detection belt 6 is pulled during detection. The fixing column 3 is used for fixing the end part of the detection belt 6 so as to prevent the detection belt 6 from being directly pulled away when the second end of the detection belt 6 is pulled; specifically, the fixing column 3 may fix the detection tape 6 by clamping, bonding, or the like. In addition, the invention detects the hardness by pulling the detection belt 6 and extruding the soft foaming piece 10, and in order to avoid the deformation of the detection belt 6 from interfering the detection result, the detection belt 6 is preferably made of a material which is difficult to deform.

The fixed column 3 and the upright column 2 and the winding column 4 and the upright column 2 are arranged at intervals, the distance between the fixed column 3 and the upright column 2 is D1, and the distance between the winding column 4 and the upright column 2 is D2. In some embodiments, D1 — D2 can ensure that the distance between the two ends of the detection belt 6 and the contact point of the winding column 4/the column 2 is consistent with the distance between the two ends of the detection belt and the column 2, thereby improving the balance of the extrusion degree of the soft foam member 10.

Since the second end of the detection tape 6 protrudes through the gap between the winding post 4 and the pillar 2, the detection tape 6 is slidably abutted against the winding post 4 when the second end of the detection tape 6 is pulled. In this embodiment, be the cylinder around post 4, so, not only can reduce and detect area 6 and around the friction between post 4, reduce the friction to the influence of testing result, can avoid appearing sharp-pointed structure around 4 lateral walls of post moreover, avoid sharp-pointed structure to destroy and detect area 6.

In some embodiments, the upright post 2 and the winding post 4 are arranged in parallel, so that the compression force applied to the soft foaming member 10 in the height direction of the upright post 2 is consistent, which helps to improve the consistency and accuracy of the detection result.

Furthermore, the upright 2 has a fixed side for fixing the soft foam 10 and a free side arranged opposite to the fixed side; in some embodiments, the fixing post 3 and the winding post 4 are located on the free side of the upright post 2, so that on one hand, the detection belt 6 can be ensured to surround the soft foaming member 10 as much as possible and be in full contact with the soft foaming member 10, and on the other hand, the arrangement can make the area of the fixing side for fixing the soft foaming member 10 larger, so that the soft foaming member 10 with a larger area can be fixed for detection, and the detection result accuracy can be improved.

In addition, detect auxiliary device still includes fixed knot structure, fixed knot structure be used for with soft foaming spare 10 is fixed to stand 2 for soft foaming spare 10 encircles in the stand 2 outside and keeps relatively fixed with stand 2, thereby has avoided in the testing process, and soft foaming spare 10 takes place the dislocation, influences the testing result.

The fixing structure has a plurality of arrangements, in some embodiments, the fixing structure is configured as an adhesive layer, and the soft foaming member 10 is fixed on the upright post 2 by adhesive, in another embodiment, the fixing structure is configured to compress the elastic sheet 5, and the soft foaming member 10 is fixed on the upright post 2 by its own elasticity. Specifically, referring to fig. 2, the fixing structure includes two compression spring plates 5, the two compression spring plates 5 are respectively disposed corresponding to two ends of the soft foaming member 10, one end of each compression spring plate 5 is fixed to the outer side of the column 2 through a bolt, and the other end of each compression spring plate and the outer side of the column 2 form a clamping groove at an interval.

Based on the above embodiment, the present invention further provides a method for detecting the hardness of the soft foam hardware 10. The method for detecting the hardness of the soft foaming hardware 10 comprises the following steps:

step S10, providing the detection aid and the soft foam 10 as described above.

Wherein, the soft foaming piece 10 can be the original size of the soft foaming piece 10 to be detected, and the soft foaming piece is directly fixed on the upright post 2 in a surrounding way during detection and at least part of the soft foaming piece is ensured to be attached to the upright post 2; or the cutting can be performed in advance, so that the size of the cutting can be matched with the size of the outer side of the upright post 2. For example, in one embodiment, the soft foam 10 may be cut into square blocks having a length less than the perimeter of the columns 2 and a width no greater than the height of the columns 2. Further, as a preferred embodiment, the soft foaming piece 10 includes a body 11 and two fixing lugs 12, the body 11 is square, the fixing lugs 12 are respectively disposed on two opposite sides of the body 11, and the fixing lugs 12 are integrally formed with the body 11; specifically, referring to fig. 3, the body 11 is a square block with a length (the size of the body 11 corresponding to the circumferential direction of the column 2) smaller than the circumference of the column 2 and a width (the size of the body 11 corresponding to the height direction of the column 2) not greater than the height of the column 2, and the fixing lugs 12 are small blocks with a width smaller than the width of the body 11, so that the fixing of the soft foaming piece 10 can be realized only by fixing the fixing lugs 12, and not only the required soft foaming piece 10 is saved, but also the fixing structure with a smaller size is correspondingly designed, and the cost is lower.

In step S20, the flexible foam material 10 is fixed to the outside of the pillar 2, and the detection tape 6 is wound around the outside of the flexible foam material 10.

As shown in fig. 1, during detection, the soft foaming member 10 is located between the detection belt 6 and the upright post 2, surrounds the upright post 2 and is attached to the upright post 2; at the start of the test, the test tape 6 is pulled until the test tape 6 just touches the soft foam 10.

Step S30, pulling the second end with a preset force until the second end cannot move, so as to obtain the movement duration of the detection belt 6.

After the detection belt 6 moves to the position just abutting against the soft foaming piece 10, the second end of the detection belt 6 is pulled by using the preset force, timing is started, as shown in fig. 1, the detection belt is pulled along the pulling direction away from the upright post 2, the pulling force is kept on the preset force during the pulling direction, the soft foaming piece 10 is deformed to the maximum degree, and timing is stopped when the second end of the detection belt 6 cannot move any more, so that the movement duration of the detection belt 6 is obtained.

Step S40, quantifying the hardness of the soft foam component 10 according to the movement duration.

The hardness of the soft foaming component 10 can be measured according to the movement time of the detection belt 6 and the moving distance of the second end of the detection belt 6, but in view of the fact that the detection belt 6 is difficult to deform to a certain extent and the actual measurement difficulty of the moving distance of the second end of the detection belt 6 is high, the hardness of the soft foaming component 10 is quantified according to the movement time, and therefore the soft foaming component is easy to operate and high in detection accuracy.

In a specific implementation, step S40 may be performed according to the following steps:

step S41, acquiring the corresponding relation among the movement duration, the preset force and the hardness and hardness grade;

step S42, based on the correspondence, determining the hardness/softness level of the soft foam component 10 according to the movement duration.

Specifically, the correspondence between the movement duration, the preset force, and the hardness level may be preset according to actual requirements and application scenarios. For example, in one embodiment, the correspondence includes: when the preset force is 2N and the movement time t is less than or equal to 0.5s, the hardness grade is soft 2-A; when the movement time t is more than 0.5s and less than or equal to 1.5s, the hardness grade is soft 2-B; when the movement time t is more than 1.5s and less than or equal to 2s, the hardness grade is soft 2-C; when the movement time t is more than 2s and less than or equal to 3s, the hardness grade is soft 2-D; and when the movement time t satisfies t & gt 3s, the hardness-softness grade is soft 2-E.

The preset force can be set according to the experience of the detector, or the force value with any size can be selected. However, the selected force value deviates too much from the optimal force value, which results in too short or too long detected movement time and thus results in a decrease in accuracy of the detection result. In view of this, the present invention further provides a second embodiment, in which step S30 is preceded by a step of acquiring a preset force, specifically, the step of acquiring the preset force includes:

step S31, acquiring a dragging force sequence, wherein the dragging force sequence comprises a plurality of force values which are sequentially arranged according to the size, and each force value corresponds to a maximum movement duration;

step S32, selecting a force value, and using the force value to pull the second end until the second end can not move, so as to obtain the movement duration of the detection belt 6;

step S33, when the movement duration is longer than the maximum movement duration, selecting the larger adjacent force value as the force value, and repeating the step S32;

step S34, when the movement duration is equal to 0, selecting the adjacent smaller force value as the force value, and repeating the step S32;

and step S35, when the movement duration is not longer than the maximum movement duration, setting the force value as a preset force.

That is, a plurality of force values, for example, 1N, 2N, 3N, 4N, 5N, 7N, etc., are sequentially set in order of magnitude to establish a sequence of pulling forces. And each force value corresponds to a maximum movement time length, and the maximum movement time length is not limited in the invention and can be adjusted according to the actual measurement condition and the requirement of detection efficiency. For example, the maximum movement time period is 2 s. Then, any one of the force values is selected, for example, the force value 3N is selected, and the second end is pulled by the force value, so that the corresponding movement duration is measured; if the movement time is longer than 2s, the selected force value is too low, then the next force value (the adjacent force value which is longer than 3N) is selected from the pulling force sequence by 4N, the second end is pulled by the force value, the processes of detection and comparison with the maximum movement time are repeated until the measured movement time is not longer than the maximum movement time and is not equal to 0, the force value used for current detection is the optimal force value, and the force value is set as the preset force; on the contrary, if the movement duration is equal to 0, which indicates that the selected force value is too large, then the next force value (the adjacent force value less than 3N) 2N is selected from the pulling force sequence, the second end is pulled by the force value, the processes of detection and comparison with 0 are repeated until the measured movement duration is not greater than the maximum movement duration and is not equal to 0, the force value used for the current detection is the optimal force value, and the force value is set as the preset force. The preset force is then used to engage in step S30. Thus, the detection result can be more accurate.

Based on this, the present invention further provides an optimal implementation scheme for obtaining the corresponding relationship among the exercise duration, the optimal pulling force and the hardness-softness rating in step S41. The inventor establishes an evaluation standard of the hardness of the soft foaming piece 10 by evaluating various soft foaming pieces 10 commonly used in the field of automobiles and combining the requirements of the automobiles on the hardness of the soft foaming piece 10, and the evaluation standard specifically comprises the following steps: under the condition that the preset force is N; when the movement time length is more than 0s and less than or equal to 1s, the hardness grade is soft N-A; when the movement time t is more than 1s and less than or equal to 1.5s, the hardness-softness grade is soft N-B; and when the movement time t is more than 1.5s and less than or equal to 2s, the hardness-softness grade is soft N-C. The hardness and softness grades are adjusted adaptively according to different preset forces, as shown in table 1. In this embodiment, the pulling force sequences are 3N, 5N, and 10N, and the maximum movement duration corresponding to each force value is 2 s. In one example, a sponge is detected, during detection, a force value is selected to be 5N, a detection result shows that the corresponding movement time is 2.5s, then, according to the following table 1, 10N is selected to be the next force value, detection is performed again, a result shows that the corresponding movement time is 1.3s, and the force value is set to be a preset force, so that the hardness grade of the sponge is soft 10-B.

TABLE 1 hardness and hardness evaluation criteria

In conclusion, the method provided by the invention is simple to operate, has high stability of the detection result, and can accurately and objectively evaluate the hardness of the soft foaming part 10, so that the evaluation of the hardness of the soft foaming part 10 is accurate and objective, and bad communication caused by artificial subjective factors and abstract similar soft and hard evaluation results is avoided.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.