CN109655303B - Mattress hardness grading quantitative test method - Google Patents
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a mattress hardness grading quantitative test device.A movable support is arranged on a test platform and can move back and forth, a vertical downward mechanical property test device is arranged on the movable support and is used for measuring load-displacement data of each discrete test point on a mattress, the mechanical property test device is connected with a host through a circuit, the test platform comprises a peripheral support and a rigid table top with holes in the middle, the peripheral support comprises an upper layer support and a lower layer support, the rigid table top with holes in the middle is arranged in the top of the upper layer support, the lower end of the rigid table top with holes in the middle is fixedly matched with the lower layer support, and a gas channel is reserved in the middle part of each side of the lower layer support. The invention also discloses a mattress hardness grading quantitative test method and an evaluation method. The hardness grading system can provide scientific basis for humanized design and customized production of the mattress, and can grade the hardness of the mattress through the hardness index value so as to quantitatively evaluate the hardness grade of the mattress.
Description
Technical Field
The invention relates to the technical field of mattress hardness testing, in particular to a mattress hardness grading quantitative testing method.
Background
The sleep is the guarantee of human energy and physical recovery, and the mattress is as the platform of sleep, and its physical properties has important influence to the sleep quality. The stiffness of the mattress is an important aspect of characterizing the physical properties of the mattress, primarily because the softness of the mattress affects not only the relief of the human-bed pressure, but also the spinal support. The hardness of the mattress is not easy to be too high, when the hardness of the mattress is too high, if the local pressure of an interface between a person and a bed is 2 times greater than the pressure of a terminal arteriole blood vessel of a human body, namely 9.33KPa (70mmHg), and the pressure duration is 1-2h, the perfusion of capillary vessels to tissues can be blocked, the hypoxia is caused, and the irreversible damage to muscle and soft tissues of the human body can be caused when the pressure duration exceeds 2 h. For healthy people, the influence of human-bed interface pressure on human muscle soft tissues can be reduced by appropriate action behaviors such as turning over (normally, the turning over times are about 20 times per night), but the too frequent action behaviors in sleeping can make the sleeping time interrupted and difficult to maintain, thereby being not beneficial to improving the sleeping quality. For the person who is limited in behavior or bedridden for a long time, the bedsore can be formed under the dual effects of the acting time and the acting strength of the load. When the mattress is too soft, a human body can sink deeply into the mattress, larger energy is required to be consumed for human body turning-over or posture adjustment, the number of times of human body turning-over is obviously reduced, and the local part of the human body is in a continuously pressed state due to too few turning-over times, so that the blood circulation and nerve conduction of the human body are not facilitated, and the muscle relaxation of the human body is also not facilitated; moreover, when the mattress is too soft, the contact area of the human-bed interface is increased, the excessive contact area is not beneficial to the diffusion of moisture of the human-bed interface, and the microenvironment of the wet and sticky human-bed interface is not beneficial to the improvement of the sleeping comfort of the human body.
In addition, when the mattress is too hard, the pressure distribution of the human-bed interface is concentrated, when the user sleeps in a supine sleeping posture, the pressure is mainly concentrated on the apophysis parts such as the hip, the shoulder, the head and the like, the waist part is in a suspended state and is lack of support, which is not beneficial to muscle relaxation and the natural state of the spine; the pressure of the side-lying sleeping position is mainly concentrated on the large crutch point, the rib part, the shoulder part and the head part, when the side-lying sleeping position is in a mattress with larger hardness, the stability of the human body is poorer, and in order to keep the sleeping position, partial muscles are in a tight force application state, and the muscle fatigue can be caused for a long time. Namely, the mattress is too hard to be beneficial to the natural bending state of the spine of the human body and the relaxation of muscles. And increased disc compression once the spine is in an unnatural bending state. The mattress is too soft, the buttocks are very easy to sink deeply into the mattress, and the natural bending state of the spine is not facilitated, so that the intervertebral disc pressure is zero and the muscles are not relaxed.
Therefore, the hardness of the mattress plays an important role in human health, sleep quality and the like. As is known, the support of a mattress on a human body is the result of interaction between the whole mattress and the weight of the human body, but at present, the evaluation of the softness and hardness of the mattress mainly remains in the aspects of the test of a single material of the mattress, the subjective and qualitative description of the whole mattress, and the like, such as the 'softness', 'hardness', 'moderate hardness', and the like of the mattress, and the standard for objectively and quantitatively testing and evaluating the softness and hardness of the whole mattress is lacked. With the continuous expansion of the Chinese mattress consumption market, the evaluation of the mattress hardness can not stay in subjective and qualitative description, and the evaluation and classification of the mattress hardness must be carried out through standard quantitative tests, so that on one hand, the evaluation can help consumers to select and purchase mattresses suitable for the consumers, and on the other hand, the evaluation is also beneficial to the standardized design and production of enterprises.
Meanwhile, with the further development of customized furniture, the quantitative test and evaluation of the hardness of the mattress are also the basis of customized production of the mattress. This is mainly because the human body is a personalized human body, different people have different reminders and weights, and different reminders and weights have different requirements on the hardness and hardness distribution of the mattress. For example, the lumbar curve of Asian people is gentler than that of European and American people, the European and American people have larger gaps between the lumbar curve and the mattress, so that the whole hardness of the mattress is smaller in order to keep the natural shape of the spine, and particularly, the sinking amount of the hip region is large enough. Therefore, the hardness of the mattress is different from that of the western mattress in the selection range of Chinese consumers, and the hardness standard of the mattress made by the western countries is not suitable for Chinese. At present, the standard mattress hardness testing method in China is still in a blank state, and the standard for setting the hardness grading of the mattress according to the body type of Chinese people is lacking.
Accordingly, there is an urgent need for a quantitative test method for hardness grading of mattress, which can provide scientific basis for humanized design and customized production of mattress.
Disclosure of Invention
The invention aims to provide a mattress hardness grading quantitative test method which can provide scientific basis for humanized design and customized production of a mattress.
The invention adopts the following technical scheme to solve the technical problems:
the utility model provides a hierarchical quantification test equipment of mattress hardness, includes test platform, removes support, mechanical properties testing arrangement, host computer, it installs on test platform and can the back-and-forth movement to remove the support, it is used for measuring the load-displacement data of each discrete test point on the mattress to be provided with vertical mechanical properties testing arrangement down on the removal support, mechanical properties testing arrangement passes through the circuit and links to each other with the host computer, test platform includes support and the foraminiferous rigidity mesa in middle of all around, the support includes upper support and lower floor's support all around, is equipped with the foraminiferous rigidity mesa in middle of the middle in the upper support top, the fixed lower floor's support that matches of foraminiferous rigidity mesa lower extreme in middle, the gas passage is left to the every side mid portion of lower floor's support.
As one preferable mode of the invention, the movable support comprises a support beam and upright columns arranged on two sides, a hollow groove is arranged in the middle of the support beam, a motion track for the mechanical property testing device to move linearly is arranged on the inner wall of the hollow groove, linear tracks are arranged on two sides of the upper layer support, and the upright columns on two sides of the movable support can move back and forth in the linear tracks.
The mechanical performance testing device comprises a moving support, a servo motor and a mechanical performance testing device, wherein the servo motor drives and controls the upright columns on two sides of the moving support to synchronously move in the linear track and the moving track of the empty slot.
As one of the preferable modes of the invention, the mechanical performance testing device further comprises a line channel and an acquisition card, wherein the line channel is used for collecting lines of the servo motor and the mechanical performance testing device together; the acquisition card synchronously acquires signals of respective circuits of the mechanical property testing device and the servo motor.
The display device further comprises a display, and the display is connected with the host.
In a preferred embodiment of the present invention, the pressure head of the bottom press of the mechanical property testing apparatus is a ball segment.
In a preferred embodiment of the present invention, the diameter d of the segment is 355mm, r is 800mm, and the total contact area s is 1000cm 2.
The invention also discloses a mattress hardness grading quantitative test method, which comprises the following steps:
(1) firstly, the mattress is kept still in the environment with room temperature (23 +/-2) DEG C and relative humidity (50 +/-5)% for 24 hours to adapt to the environment before testing;
(2) then, the mattress is placed on a rigid table top with a hole in the middle of the test platform, the bottom press descends at a constant speed of 90mm/min and acts on each discrete test point of the mattress, the mattress deforms under the action of pressure, and the average value is obtained by repeating the three times;
(3) finally, the experimental loading curve is obtained and stored by the host.
The invention also discloses an evaluation method for the mattress hardness grading quantitative test, which comprises the following steps:
(1) calculating the hysteresis loss rate H of the mattress according to the experimental loading curve of the mattress hardness test as follows:
wherein A is1Is the area between the loading curve and the unloading curve in the range of 0N to 1000N, A2Is the area between the loading curve and the x-axis within the range of 0N-1000N;
(2) obtaining a load-displacement curve through a formula (1), calculating two hardness index values K and S by combining the pressure value born by the blood vessel of the human body, and grading the hardness of the mattress by utilizing the ranges of the K and S values;
(3) and finally, subjectively evaluating the hardness of the mattress by using a human body subjective comfort evaluation method, and correcting two hardness indexes of a K value and an S value. The pressure bearing characteristic of the human blood vessel is that the pressure of the human arteriole capillary is 3.3-4.6kPa (25-35mmHg), the pressure of the venule blood vessel is 1.6KPa (12mmHg), the critical value of the venule blood vessel pressure is 4KPa (30mmHg), if the pressure applied to the human body locally from the outside is more than twice of the terminal capillary arterial pressure, namely 9.33KPa (70mmHg), and the pressure lasts for 1-2h, the perfusion of the capillary to the tissue can be blocked, the tissue hypoxia is caused, and the irreversible damage can be caused when the pressure exceeds more than two hours.
As one of the preferable modes of the present invention, the specific calculation formulas and steps of the K value and the S value include:
the calculation formula of the hardness index S of the mattress is as follows:
S＝10(1-e-(Ka+b))2 (2)
wherein a is 7.737X 10-4, b is 9.706X 10-2, 1 is not less than S not more than 10, when S < 3 represents hard, 3 is not less than S not more than 6 represents moderate hardness, 6 is not less than S not more than 10 represents soft;
k is an important factor influencing the hardness of the mattress and has the unit of mm2The formula is as follows:
according to the LGA standard K < 900(mm2), the mattress is relatively hard, the mattress is 900(mm2) K < 1800(mm2) for moderate hardness, and the mattress is more than 1800(mm2) for softer mattress; wherein A is450Is the total area between the load curve and the x-axis in the range of 0N-450N, T is the average of the load curve slopes (in N/mm), i.e.:
wherein T is210、T275、T340The distribution is the slope of the tangent of the loading curve at 210N, 275N and 340N, in N/mm;
the calculation steps of the K value and the S value comprise:
a1: calculating the total area between the loading curve and the x axis in the range of 0N-450N, and recording the total area as A450 with the unit of N mm;
a2: calculating the tangent slopes of the loading curves at 210N, 275N and 340N, and respectively calculating the tangent slopes as T210、T275、T340Calculating the average value of the three, recording as T, and the unit is N/mm;
a3: calculating the ratio of A450 to T, recording the ratio as a K value, and taking the unit as mm 2;
when K is less than 900(mm2) to indicate that the mattress is relatively hard, K is more than or equal to 900(mm2) and less than or equal to 1800(mm2) to indicate that the mattress is moderately hard, and K is more than 1800(mm2) to indicate that the mattress is relatively soft;
a4: and calculating the hardness index S value according to the K value, wherein the calculation method is shown as a formula (2):
S＝10(1-e-(Ka+b))2 (2)
wherein a is 7.737X 10-4, b is 9.706X 10-2, 1 is not less than S not more than 10, when S < 3 is hard, 3 is not less than S not more than 6 is moderate in hardness, and 6 is not less than S not more than 10 is soft.
Compared with the prior art, the invention has the advantages that: (1) at present, whether in the market range or in the scientific research field, the description about the hardness of the mattress is mostly or qualitatively. The qualitative description is not beneficial to the comparison between enterprise products and the standardized production and design, and simultaneously, the qualitative description restricts the innovative design and the customized design and production of the mattress. The hardness grading quantitative test equipment, the method and the evaluation method of the mattress provided by the invention overcome the limitations, the hardness grading is carried out on the mattress through the hardness index value, the mattress product is divided into three hardness ranges of soft, soft and hard moderate and hard and 10 hardness grades, namely K is less than 900(mm2) to indicate that the mattress is hard, K is more than or equal to 900(mm2) and less than or equal to 1800(mm2) to indicate that the mattress is soft and hard moderate, and K is more than 1800(mm2) to indicate that the mattress is soft. Meanwhile, a quantified hardness index value S (S is more than or equal to 1 and less than or equal to 10) is obtained, and the hardness grade of the mattress is evaluated in detail. In addition, enterprises can further subdivide 10 hardness grades according to the requirements of product positioning and evaluation;
(2) the lumbar curve (namely the body type) of Chinese people is greatly different from that of European and American people, and meanwhile, the sleeping posture preference and the hardness preference are also greatly different, so that the evaluation standard of the support performance of the European and American mattress is not suitable for evaluating the requirements of Chinese people. According to the invention, based on the body type characteristics, sleeping postures, sleeping habit preferences, gender differences and the like of Chinese people, the hardness evaluation and grading standard of the mattress are established through a matching combination mode and comfort evaluation of more than 1000 mattresses, and scientific basis can be provided for bed selection of Chinese consumers and customized design and production of the mattress. As shown in experimental research, male has obvious bony prominence and lower fat content by about 10 percent compared with female, therefore, the mattress used by male has softer hardness which is beneficial to relieving pressure on the premise of ensuring sufficient support, and the hardness range of the mattress is recommended to be 5-8, and the hardness range of the mattress used by female is 3-7;
(3) the invention can also test the hardness of each point on the mattress, and draw the hardness distribution map of the whole mattress according to the test result. The reasonability of the support of each area of the mattress is evaluated through the hardness distribution and the body shape and the weight of a user, particularly whether the lumbar support is reasonable or not is evaluated, and whether the natural bending state of the spine can be ensured. A common zoned mattress is divided into five regions, head, shoulder, back, waist, hip, and leg. The hardness grading and hardness distribution of the mattress provide data support for the modular design and customized production of the mattress;
(4) through the mattress hardness test, the invention can provide visual and scientific basis for consumers to select and purchase mattresses;
(5) the critical value of the pressure of the terminal arteriole of the human body is 4KPa, if the pressure applied to the local part of the human body from the outside is more than two times of the arterial pressure of the terminal capillary, namely 9.33KPa, and the pressure lasts for 1-2h, the perfusion of the capillary to tissues can be blocked, the hypoxia of the tissues is caused, and the bedsore is possibly formed due to large long-term pressure. The influence of the supporting force of the mattress on the blood circulation of a human body can be relieved by posture adjustment of turning over and the like for healthy people, and the turning over and posture adjustment and the like must be assisted by guardians or nursing staff for old people with inconvenient actions or people with restricted behaviors. The mattress has high hardness, and the turnover frequency is more frequent. Therefore, the invention can provide scientific theoretical basis for the monitoring work of the old with inconvenient actions and the person with restricted behaviors. The hardness S value of the common mattress is 3-4, and the posture needs to be adjusted once at intervals of 30 min; the hardness S value is 4-5, and the posture needs to be adjusted once at an interval of 50 min; the hardness S value is 5-6, and the posture needs to be adjusted once at an interval of 60 min;
(6) the market share of intelligent furniture is getting bigger and bigger, the intelligent design of the mattress is still in the early development stage, and the lack of a standardized mattress hardness evaluation method is an important factor for limiting the intelligent development of the mattress. The quantitative test device, method and evaluation method for grading mattress hardness can exactly solve the problem. The mattress hardness grading quantitative test device, the method and the evaluation method provided by the invention can provide scientific theoretical basis and data support for intelligent adjustment and intelligent monitoring of the intelligent bed;
(7) the mattress hardness grading quantitative test device, the method and the evaluation method can provide scientific theoretical basis and data support for standardized production and customized design of enterprise mattresses and production and sale (in-sale and after-sale) services. Enterprises can establish the relationship between factors such as human body type, weight, sex and the like and the hardness of the mattress, thereby serving the standardized production, customized design, production and sale of the enterprise mattress.
Drawings
FIG. 1 is a schematic structural diagram of a quantitative test device for grading hardness of a mattress according to the present embodiment;
FIG. 2 is a schematic diagram of the quantitative test device for hardness grading of mattress in this embodiment when testing;
FIG. 3 is a schematic structural diagram of a bottom press of the mechanical testing apparatus in this embodiment;
FIG. 4 is a schematic diagram of discrete test points on the mattress of the present embodiment;
fig. 5 is a load-displacement curve obtained by the hardness grading test in this example.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
As shown in fig. 1-5, the quantitative test equipment for hardness grading of a mattress in this embodiment includes a test platform (1), a movable support (2), a mechanical property test device (3), and a host (4), where the movable support (2) is installed on the test platform (1) and can move back and forth, the movable support (2) is provided with the mechanical property test device (3) facing downward vertically for measuring load-displacement data of each discrete test point (9) on the mattress (8), the mechanical property test device (3) is connected to the host (4) through a circuit, the test platform (1) includes a peripheral support (11) and a rigid table (12) with holes in the middle, the hole diameter is 6mm, the hole pitch is 20mm, so as to discharge gas generated in the test process out of the mattress in time, the peripheral support (11) includes an upper support and a lower support, wherein the top of the upper layer bracket is internally provided with a rigid table top (12) with a hole in the middle, the lower end of the rigid table top (12) with the hole in the middle is fixedly matched with the lower layer bracket, and the middle part of each side of the lower layer bracket is provided with a gas channel (14); the embodiment provides a test instrument device and a working process for quantitatively testing the hardness of a mattress, the independent support of each point of the mattress and the mutual interference degree among the points of the mattress.
Example 2
The bed mattress hardness grading quantitative test device of the embodiment is basically the same as the bed mattress hardness grading quantitative test device of the embodiment 1, and mainly has the difference that the movable support (2) comprises a support cross beam (21) and upright columns (22) arranged at two sides, a hollow groove (211) is arranged in the middle of the support cross beam (21), a motion track which can be used for the mechanical property test device (3) to move linearly is arranged on the inner wall of the hollow groove (211), linear tracks (13) are arranged at two sides of the upper support, the upright columns (22) at two sides of the movable support (2) can move back and forth in the linear tracks (13), the bed mattress hardness grading quantitative test device further comprises a servo motor (7), the servo motor (7) drives and controls the upright columns (22) at two sides of the movable support (2) to move synchronously in the linear tracks (13) and the mechanical property test device (3) to move in the motion track of the hollow groove (211), and further comprises a line, the line channel (212) is used for collecting lines of the servo motor (7) and the mechanical property testing device (3) together; the mechanical property testing device is characterized in that the acquisition card (5) is used for synchronously acquiring signals of respective lines of the mechanical property testing device (3) and the servo motor (7), the mechanical property testing device further comprises a display (6), the display (6) is connected with the host (4), a pressure head of a bottom press (31) of the mechanical property testing device (3) is a ball segment, the diameter d of the ball segment is 355mm, r of the ball segment is 800mm, and the total contact area s of the ball segment is 1000cm2(ii) a The hardness of each point on the mattress can be tested by the embodiment, and data support is provided for the subsequent drawing of the hardness distribution diagram of the whole mattress.
Example 3
The embodiment also discloses a mattress hardness grading quantitative test method, which comprises the following steps:
(1) firstly, the mattress (8) is kept still in the environment with room temperature (23 plus or minus 2) DEG C and relative humidity (50 plus or minus 5)% for 24 hours to adapt to the environment before testing;
(2) then, the mattress (8) is placed on a rigid table top (12) with a hole in the middle of the test platform (1), a bottom press (31) descends at a constant speed of 90mm/min and acts on each discrete test point (9) of the mattress (8), the mattress (8) deforms under the action of pressure, and the average value is obtained by repeating the three times;
(3) finally, an experimental loading curve is obtained and stored by the host (4).
The firmness grading and firmness distribution of the mattress of this embodiment provides data support for modular design and customized production of the mattress.
Example 4
The embodiment also discloses an evaluation method of the mattress hardness grading quantitative test, which comprises the following steps:
(1) calculating the hysteresis loss rate H of the mattress according to the experimental loading curve of the mattress hardness test as follows:
wherein A is1Is the area between the loading curve and the unloading curve in the range of 0N to 1000N, A2Is the area between the loading curve and the x-axis within the range of 0N-1000N;
(2) obtaining a load-displacement curve through a formula (1), calculating two hardness index values K and S by combining the pressure value born by the blood vessel of the human body, and grading the hardness of the mattress by utilizing the ranges of the K and S values;
(3) and finally, subjectively evaluating the hardness of the mattress by using a human body subjective comfort evaluation method, and correcting two hardness indexes of a K value and an S value. The pressure bearing characteristic of the human blood vessel is that the pressure of the human arteriole capillary is 3.3-4.6kPa (25-35mmHg), the pressure of the venule blood vessel is 1.6KPa (12mmHg), the critical value of the venule blood vessel pressure is 4KPa (30mmHg), if the pressure applied to the human body locally from the outside is more than twice of the terminal capillary arterial pressure, namely 9.33KPa (70mmHg), and the pressure lasts for 1-2h, the perfusion of the capillary to the tissue can be blocked, the tissue hypoxia is caused, and the irreversible damage can be caused when the pressure exceeds more than two hours.
Further, the specific calculation formula and steps of the K value and the S value include:
the calculation formula of the hardness index S of the mattress is as follows:
S＝10(1-e-(Ka+b))2 (2)
wherein a is 7.737X 10-4, b is 9.706X 10-2, 1 is not less than S not more than 10, when S < 3 represents hard, 3 is not less than S not more than 6 represents moderate hardness, 6 is not less than S not more than 10 represents soft;
k is an important factor influencing the hardness of the mattress and has the unit of mm2The formula is as follows:
according to the LGA standard K < 900(mm2), the mattress is relatively hard, the mattress is 900(mm2) K < 1800(mm2) for moderate hardness, and the mattress is more than 1800(mm2) for softer mattress; wherein A is450Is the total area between the load curve and the x-axis in the range of 0N-450N, T is the average of the load curve slopes (in N/mm), i.e.:
wherein T is210、T275、T340The distribution is the slope of the tangent of the loading curve at 210N, 275N and 340N, in N/mm;
the calculation steps of the K value and the S value comprise:
a1: calculating the total area between the loading curve and the x axis in the range of 0N-450N, and recording the total area as A450 with the unit of N mm;
a2: calculating the tangent slopes of the loading curves at 210N, 275N and 340N, and respectively calculating the tangent slopes as T210、T275、T340And calculating the average value of the three, recording the average value as T, unitIs N/mm;
a3: calculating the ratio of A450 to T, recording the ratio as a K value, and taking the unit as mm 2;
when K is less than 900(mm2) to indicate that the mattress is relatively hard, K is more than or equal to 900(mm2) and less than or equal to 1800(mm2) to indicate that the mattress is moderately hard, and K is more than 1800(mm2) to indicate that the mattress is relatively soft;
a4: and calculating the hardness index S value according to the K value, wherein the calculation method is shown as a formula (2):
S＝10(1-e-(Ka+b))2 (2)
wherein a is 7.737X 10-4, b is 9.706X 10-2, 1 is not less than S not more than 10, when S < 3 is hard, 3 is not less than S not more than 6 is moderate in hardness, and 6 is not less than S not more than 10 is soft.
The embodiment can provide scientific theoretical basis and data support for intelligent adjustment and intelligent monitoring of the intelligent bed; and provide scientific theoretical basis and data support for the standardized production and customized design of the enterprise mattress and the production and sale (in-sale and after-sale) service. Enterprises can establish the relationship between factors such as human body type, weight, sex and the like and the hardness of the mattress, thereby serving the standardized production, customized design, production and sale of the enterprise mattress.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The mattress hardness grading quantitative test method is characterized by comprising mattress hardness grading quantitative test equipment, wherein the equipment comprises a test platform (1), a movable support (2), a mechanical property test device (3) and a host (4), the movable support (2) is mounted on the test platform (1) and can move back and forth, the movable support (2) is provided with a vertical downward mechanical property test device (3) for measuring load-displacement data of each discrete test point (9) on a mattress (8), the mechanical property test device (3) is connected with the host (4) through a circuit, the test platform (1) comprises a peripheral support (11) and a rigid table top (12) with holes in the middle, the peripheral support (11) comprises an upper support and a lower support, the rigid table top (12) with holes in the middle is arranged in the top of the upper support, the lower end of the rigid table top (12) with the hole in the middle is fixedly matched with the lower-layer support, a gas channel (14) is reserved in the middle of each side of the lower-layer support, the movable support (2) comprises a support cross beam (21) and stand columns (22) arranged on two sides, a hollow groove (211) is formed in the middle of the support cross beam (21), a motion track capable of enabling the mechanical property testing device (3) to move linearly is arranged on the inner wall of the hollow groove (211), linear tracks (13) are arranged on two sides of the upper-layer support, and the stand columns (22) on two sides of the movable support (2) can move back and forth in the linear tracks (13);
the test method comprises the following steps:
(1) firstly, the mattress (8) is kept still in the environment with room temperature (23 plus or minus 2) DEG C and relative humidity (50 plus or minus 5)% for 24 hours to adapt to the environment before testing;
(2) then, the mattress (8) is integrally placed on a rigid table top (12) with a hole in the middle of the test platform (1), a bottom press (31) descends at a constant speed of 90mm/min and acts on each discrete test point (9) of the mattress (8), the mattress (8) deforms under the action of pressure, and the averaging is repeatedly carried out for three times;
(3) finally, obtaining and storing an experiment loading curve by the host (4);
the step (3) comprises the following steps:
s1, calculating the hysteresis loss rate H of the mattress according to the experimental loading curve of the mattress hardness test as follows:
wherein A is1Is the area between the loading curve and the unloading curve in the range of 0N to 1000N, A2Is the area between the loading curve and the x-axis within the range of 0N-1000N;
s2, obtaining a load-displacement curve through a formula (1), calculating two hardness index values K and S by combining the pressure values borne by the blood vessels of the human body, and grading the hardness of the mattress by using the ranges of the K and S values;
and S3, finally, subjectively evaluating the hardness of the mattress by using a human body subjective comfort evaluation method, and correcting two hardness indexes of a K value and an S value.
2. The quantitative test method for grading mattress hardness according to claim 1, wherein the specific calculation formula and steps of the K value and the S value comprise:
the calculation formula of the hardness index S of the mattress is as follows:
S＝10(1-e-(Ka+b))2 (2)
wherein a is 7.737X 10-4, b is 9.706X 10-2, 1 is not less than S not more than 10, when S < 3 represents hard, 3 is not less than S not more than 6 represents moderate hardness, 6 is not less than S not more than 10 represents soft;
k is an important factor influencing the hardness of the mattress and has the unit of mm2The formula is as follows:
according to LGA standard K < 900mm2900mm, which means that the mattress is relatively hard2≤K≤1800mm2The hardness of the mattress is moderate, and K is more than 1800mm2Indicating that the mattress is softer; wherein A is450Is the total area between the loading curve and the x-axis in the range of 0N-450N, T is the average of the loading curve slopes, and the unit is N/mm, namely:
wherein T is210、T275、T340The distribution is the slope of the tangent of the loading curve at 210N, 275N and 340N, in N/mm;
the calculation steps of the K value and the S value comprise:
a1: calculating the total area between the loading curve and the x axis in the range of 0N-450N, and recording the total area as A450 with the unit of N mm;
a2: calculating the tangent slopes of the loading curves at 210N, 275N and 340N, and respectively calculating the tangent slopes as T210、T275、T340Calculating the average value of the three, recording as T, and the unit is N/mm;
a3: the ratio of A450 to T is calculated and recorded as the K value in mm2；
When K is less than 900mm2900mm, which means that the mattress is relatively hard2≤K≤1800mm2The hardness of the mattress is moderate, and K is more than 1800mm2Indicating that the mattress is softer;
a4: and calculating the hardness index S value according to the K value, wherein the calculation method is shown as a formula (2):
S＝10(1-e-(Ka+b))2 (2)
wherein a is 7.737X 10-4, b is 9.706X 10-2, 1 is not less than S not more than 10, when S < 3 is hard, 3 is not less than S not more than 6 is moderate in hardness, and 6 is not less than S not more than 10 is soft.
3. The quantitative test method for mattress hardness grading according to claim 1, characterized in that the apparatus further comprises a servo motor (7), wherein the servo motor (7) drives and controls the upright posts (22) at two sides of the moving bracket (2) to move synchronously in the linear track (13) and the mechanical property test device (3) to move synchronously in the motion track of the empty groove (211).
4. The quantitative test method for mattress hardness classification according to claim 1, characterized in that the equipment further comprises a line channel (212) and an acquisition card (5), wherein the line channel (212) is used for collecting lines of the servo motor (7) and the mechanical property test device (3) together; the acquisition card (5) is used for synchronously acquiring signals of respective circuits of the mechanical property testing device (3) and the servo motor (7).
5. The quantitative test method for mattress hardness grading according to claim 4, characterized in that the apparatus further comprises a display (6), the display (6) being connected to the host computer (4).
6. The quantitative test method for grading mattress hardness according to claim 1, characterized in that the pressure head of the bottom press (31) of the mechanical property test device (3) is a ball segment.
7. The quantitative test method for grading mattress hardness according to claim 6, wherein the diameter d of the ball segment is 355mm, r is 800mm, and the total contact area s is 1000cm2。
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| CN111927808B (en) * | 2020-04-24 | 2022-04-29 | 明达光电(厦门)有限公司 | Inflatable hardness positioning method for inflatable bed system |
| CN111897377A (en) * | 2020-08-06 | 2020-11-06 | 广东珞珈睡眠科技有限公司 | Control method of intelligent air bag mattress |
| CN111965058A (en) * | 2020-08-28 | 2020-11-20 | 南京林业大学 | Multifunctional mattress hardness tester |
| CN112434918A (en) * | 2020-11-09 | 2021-03-02 | 深圳市赛德检测技术有限公司 | Method and system for evaluating softness and hardness of sofa and computer readable storage medium |
| CN112378686B (en) * | 2020-11-13 | 2024-03-12 | 大自然科技股份有限公司 | Method for judging mattress support stability index |
| CN113567168B (en) * | 2021-08-26 | 2023-10-03 | 浙江省轻工业品质量检验研究院 | Test equipment and method for measuring interference degree between partitioned mattresses |
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