CN109682684A - The test method of recessed light fixture - Google Patents
The test method of recessed light fixture Download PDFInfo
- Publication number
- CN109682684A CN109682684A CN201811579484.4A CN201811579484A CN109682684A CN 109682684 A CN109682684 A CN 109682684A CN 201811579484 A CN201811579484 A CN 201811579484A CN 109682684 A CN109682684 A CN 109682684A
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- CN
- China
- Prior art keywords
- light fixture
- recessed light
- elastic cushion
- dead load
- block stamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/08—Testing mechanical properties
Abstract
The present invention provides a kind of test methods of recessed light fixture, are related to the technical field of lamps and lanterns test, the surface including elastic cushion to be covered on to recessed light fixture, wherein the parameter of the light shell outer cover and installation part upper surface of elastic cushion and recessed light fixture matches；By block stamp to elastic cushion apply pressure, dead load can be born to the reality of recessed light fixture and tested, can the recessed light fixture to each application scenarios accurately tested.
Description
Technical field
The present invention relates to lamps and lanterns the field of test technology, more particularly, to a kind of test method of recessed light fixture.
Background technique
The inside of supporter is arranged in traditional recessed light fixture light shell outer cover, and by rubber pad and block stamp directly to branch
Support body applies pressure, to test the test index for whether meeting lighting area of recessed light fixture.
Traditional recessed light fixture, is protected using metal shell or supporting element, and the glass lens or plastics of protrusion are saturating
The difference in height of light part and metal shell or supporting element is smaller, and when carrying out static load test, block stamp is acted on by rubber pad
Lamp surface.Pressure mainly acts on metal shell or supporting element, and glass lens or light-passing plastic part receive it is direct or
It is smaller to connect active force.
Currently, in order to meet applied to higher illumination index request needed for the special application fields lamps and lanterns such as aviation, navigation,
There is no supporters outside recessed light fixture light shell outer cover, if surveying according to conventional test methodologies to such recessed light fixture
There is very big error in examination, the test result of generation and actual result, traditional recessed light fixture test method there are larger limitation,
It can not achieve the accurate test to the recessed light fixture of each application scenarios.
Summary of the invention
In view of this, the purpose of the present invention is to provide the test method of recessed light fixture, it can be to each application scenarios
Recessed light fixture accurately tested.
In a first aspect, the embodiment of the invention provides a kind of test methods of recessed light fixture, comprising:
Elastic cushion is covered on to the surface of recessed light fixture, wherein the light source of the elastic cushion and the recessed light fixture
The parameter of shell and installation part upper surface matches；
Pressure is applied to the elastic cushion by block stamp, dead load can be born to the reality of the recessed light fixture and surveyed
Examination.
With reference to first aspect, the embodiment of the invention provides the first possible embodiments of first aspect, wherein institute
It states and includes: by the surface that elastic cushion is covered on recessed light fixture
The elastic cushion to match with the parameter of the light shell outer cover of the recessed light fixture and installation part upper surface is chosen, it is described
Parameter includes one of shape, diameter length and surface area or a variety of；
The elastic cushion is covered on to the surface of the recessed light fixture, so that the elastic cushion and the recessed light fixture
Light shell outer cover and installation part upper surface intimate contact.
With reference to first aspect, the embodiment of the invention provides second of possible embodiments of first aspect, wherein institute
It states and includes: to elastic cushion application pressure by block stamp
Dead load can be born according to the theory that the parameter calculates the recessed light fixture；
In the case where the theory can bear dead load not less than preset standard dead load, by block stamp to the elasticity
Pad applies pressure.
With reference to first aspect, the embodiment of the invention provides the third possible embodiments of first aspect, wherein institute
State to the reality of the recessed light fixture can bear dead load carry out test include:
According to the actual pressure that the block stamp applies the elastic cushion, know that the reality of the recessed light fixture can be born
Dead load；
The reality can be born dead load to be compared with preset standard dead load；
In the case where the reality can bear dead load not less than the preset standard dead load, the recessed light fixture
Test result it is qualified；
Dead load can be born less than the standard dead load in the reality, and the test result of the recessed light fixture does not conform to
Lattice.
With reference to first aspect, the embodiment of the invention provides the 4th kind of possible embodiments of first aspect, wherein institute
The corner cut of the upper surface and the light shell outer cover of stating installation part is greater than 35 degree；
And/or
The diameter length of the lower surface of the installation part is greater than the diameter length on the bottom edge of the light shell outer cover.
With reference to first aspect, the embodiment of the invention provides the 5th kind of possible embodiments of first aspect, wherein institute
It states and includes: to elastic cushion application pressure by block stamp
The vertical axes of block stamp are aligned with the geometric center of the recessed light fixture；
Pressure is applied to the elastic cushion by the block stamp after alignment.
With reference to first aspect, the embodiment of the invention provides the 6th kind of possible embodiments of first aspect, wherein institute
It states and includes: to elastic cushion application pressure by block stamp
Stressed speed is applied no more than 5000N/min to the elastic cushion by block stamp.
With reference to first aspect, the embodiment of the invention provides the 7th kind of possible embodiments of first aspect, wherein institute
The structural parameters and the elastic cushion for stating block stamp match.
With reference to first aspect, the embodiment of the invention provides the 8th kind of possible embodiments of first aspect, wherein institute
State elastic cushion with a thickness of 10 millimeters.
With reference to first aspect, the embodiment of the invention provides the 9th kind of possible embodiments of first aspect, wherein institute
State method further include:
In the case where the theory can bear dead load less than the preset standard dead load, the recessed light fixture
Test result is unqualified.
The embodiment of the invention provides a kind of test methods of recessed light fixture, including elastic cushion is covered on recessed lighting fitting
The surface of tool, wherein the parameter of the light shell outer cover and installation part upper surface of elastic cushion and recessed light fixture matches；Pass through block stamp
Pressure is applied to elastic cushion, dead load can be born to the reality of recessed light fixture and tested, the embodiment of the present invention passes through light source
Shell, installation part upper surface structural parameters, the elastic cushion to be matched using convex-concave joined using present invention method
The elastic cushion size of number customization is greater than light shell outer cover size, and matches with the size of installation part upper surface, rushes so as to allow
The pressure approximation of application can be evenly distributed on recessed light fixture by hammer by elastic cushion, so that the measurement data of static load
More true and accurate.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention are in specification, claims
And specifically noted structure is achieved and obtained in attached drawing.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is traditional recessed light fixture and block stamp application scenarios schematic diagram；
Fig. 2 is the test method flow chart of recessed light fixture provided in an embodiment of the present invention；
Fig. 3 is one of recessed light fixture provided in an embodiment of the present invention and block stamp application scenarios schematic diagram；
Fig. 4 is the two of recessed light fixture provided in an embodiment of the present invention and block stamp application scenarios schematic diagram.
Icon: 100- block stamp；200- elastic cushion；The upper surface 300-；The lower surface 400-；500- light shell outer cover.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Currently, traditional recessed light fixture test method is to including fitting glass, metal material is supported on outer insertion
Formula lamps and lanterns are tested, the effect by block stamp to rubber pad, realize test effect, wherein the size of metal material support is small
In the area of rubber pad, because of rubber pad limited area, there are larger limitation, the insertion to each application scenarios can not achieve
The accurate test of formula lamps and lanterns is developed protrusion glass mould lamps and lanterns and is arranged in metallic supports due to the continuous improvement of lighting requirements
Except recessed light fixture, the transparency area of this product protrusion is greater than rubber pad area, according to traditional measurement method to such
Glass mould recessed light fixture product is tested, and correct result cannot be obtained.
It should be noted that cannot be arranged protrusion glass mould lamps and lanterns in metal according to traditional recessed light fixture test method
The main reason for recessed light fixture except supporting element carries out static load test is, carries out recessed light fixture static load meter
When calculation, for lamp surface product range there may be disagreements, as shown in Figure 1, according to glass mould lamps and lanterns itself surface area into
Row calculates, and is calculated also according to all surfaces product (installation part lower surface 400) for the above fitting structure that bassets, then or
Person calculates according to the installation part upper surface 300 directly with the connection of glass mould lamps and lanterns, is calculated according to three kinds of different surface areas
Mode can obtain completely different test result.
By taking a kind of diameter length is the external glass mould lamps and lanterns of 9.1cm as an example, the installation part that is connect with glass mould lamps and lanterns
The radius length of upper surface 300 is 10.15cm, and the radius length of the lower surface 400 of installation part is 14.9cm, the half of block stamp 100
Diameter is 2.5cm.
1. if using the upper surface of lamp installation element 300 as calculation basis:
Lamp surface product: S1=π r1 2=3.14 × (10.15cm)2=323.65 (cm2)
Apply pressure: F1=32 (kg/cm2)×323.65(cm2) × 9.8 (N/kg)=101496.64N
2. if using the lower surface of lamp installation element 400 as calculation basis:
S2=π r2 2=3.14 × (14.9cm) × (14.9cm)=697.1114 (cm2)
Apply pressure: F2=32 (kg/cm2)×697.1114(cm2) × 9.8 (N/kg)=218614.13504N
It should be noted that the standard requirements of field of lamp illumination static load are 32kg/cm2, and what block stamp 100 applied
Pressure is obtained by the product of surface area, the standard requirements of static load and gravity coefficient；
Wherein, during actual testing experiment, external glass mould lamps and lanterns are just hit when bearing pressure is 70530N
It is broken, cause test to interrupt, therefore, the load that lamps and lanterns are born are as follows:
F/ (Sg)=70530N/ [697.1114 (cm2) × 9.8 (N/kg)]=10.324kg/cm2
The static load born according to the calculation method using the lower surface of lamp installation element 400 as calculation basis, lamps and lanterns
For 10.324kg/cm2, it is less than standard requirements 32kg/cm2.According to this survey calculation method, lamps and lanterns static load does not conform to seemingly
Lattice, therefore such surface area calculation is not in limit of consideration.
3. if using the forced area of actual glass type lamps and lanterns as calculation basis:
S2=π r2 2=3.14 × (2.5cm)2=19.625 (cm2)。
Institute is loaded at the top of lamps and lanterns:
F/ (Sg)=70530N/ [19.625cm2× 9.8 (N/kg)]=366.7kg/cm2
At this point, the corresponding pressure of nonmetallic translucent material glass mould lamps and lanterns: P=70530N/19.625cm2×104=
35.94MPa。
This should be able to bear 32kg/cm considerably beyond lamps and lanterns2Nearly 10 times of total static load standard requirements, at the same time, need
The pressure for wanting nonmetallic translucent material glass mould lamps and lanterns to bear is also larger, the tolerance range beyond nonmetallic materials, therefore such
Surface area calculation is not in limit of consideration.
As needed to be calculated using the upper surface of lamp installation element 300 as calculation basis according to above-mentioned, punching should be overcome
The problem that hammer 100 does not contact uniformly with the above-mentioned surface area as calculation basis.
Based on this, a kind of test method of recessed light fixture provided in an embodiment of the present invention can be to each application scenarios
Recessed light fixture accurately tested.
For the survey convenient for understanding the present embodiment, first to a kind of recessed light fixture disclosed in the embodiment of the present invention
Method for testing describes in detail；
Fig. 2 is a kind of test method flow chart of recessed light fixture provided in an embodiment of the present invention.
Test method provided in an embodiment of the present invention is directed to the recessed light fixture applied to Various Complex scene, and difference is answered
Lighting requirement with the recessed light fixture of scene is different, when being directed to the higher aviation of lighting requirement, navigational field, in order to meet
Index request is illuminated, a kind of recessed light fixture that will not set metallic supports outside light shell outer cover is devised, but is directed to such lamp
Has forced area multiplicity, weight force is uneven, can not above-mentioned lamps and lanterns be carried out with the test of relevant parameter, using the embodiment of the present invention
It can solve the above problems.
Referring to Fig. 2, the test method of recessed light fixture the following steps are included:
Elastic cushion is covered on the surface of recessed light fixture by step S110, wherein the light source of elastic cushion and recessed light fixture
The parameter of shell and installation part upper surface matches；
Step S120 applies pressure to elastic cushion by block stamp, can bear dead load to the reality of recessed light fixture and carry out
Test.
Before step S110, further includes: support part by test and recessed light fixture to be tested is fixed.
Test method in the embodiment of the present invention is except can (light shell outer cover is provided with metallic supports to traditional recessed light fixture
) carry out dead load checkup, the higher lighting requirement that is applied to of metallic supports can be also not provided with to light shell outer cover
Recessed light fixture in scene, such recessed light fixture include following design feature:
The upper surface of installation part and the corner cut of light shell outer cover are greater than 35 degree；
And/or
The diameter length of the lower surface of installation part is greater than the diameter length on the bottom edge of light shell outer cover.
Recessed light fixture with These characteristics does not have metallic supports to be supported, and is tested with traditional recessed light fixture
When, it is unable to get accurate result；
In the preferred embodiment of practical application, structural parameters and the elastic cushion of block stamp match, including shape, half path length
The matching of degree and surface area, block stamp with a thickness of 50mm, elastic cushion includes the elastic materials such as rubber pad, elastic cushion with a thickness of
The hardness of 10mm, elastic cushion meet " Shore A " (hardness measured with A type hardness tester)=65 ± 5.
A kind of step S110 as possible preferred embodiment, in foregoing invention embodiment, comprising:
Step S210 chooses the elasticity to match with the parameter of the light shell outer cover of recessed light fixture and installation part upper surface
Pad, parameter includes one of shape, diameter length and surface area or a variety of；
Elastic cushion 200 is covered on the surface of recessed light fixture by step S220, so that elastic cushion 200 and recessed light fixture
300 intimate contact of light shell outer cover 500 and installation part upper surface, as shown in Figure 3 and Figure 4, the wherein light source of recessed light fixture
Shape that there are many shells 500 selects different elasticity according to the characteristic of different light shell outer covers 500 and installation part upper surface 300
Pad 200 makes elastic cushion 200 and recessed light fixture intimate contact, here, table in the radius length and installation part of elastic cushion 200
The radius length in face 300 matches (i.e. the size of elastic cushion 200 is greater than light shell outer cover 500), and shape passes through concave-convex nothing
The seam way of contact matches with light shell outer cover 500, and according to the radius length and shape to match, the surface area to be matched is big
It is small.
Wherein, referring to fig. 4, installation part can be also cylinder, i.e., upper surface 300 is equal with the radius length of lower surface 400.
Further, in the step S120 of above-described embodiment, by block stamp to elastic cushion apply pressure the step of, comprising:
Step S310 can bear dead load according to the theory that parameter calculates recessed light fixture；
Step S320, in the case where theory can bear dead load not less than preset standard dead load, by block stamp to bullet
Property pad apply pressure；
Referring to the parameter acquisition modes in above-described embodiment, recessed light fixture is calculated according to the surface area size to match
Theory can bear dead load, and the theory being calculated can be born dead load and be compared with preset standard dead load, resonable
By dead load can be born less than in the case where preset standard dead load, it directly can determine that the test result of recessed light fixture does not conform to
Lattice reduce then without carrying out remaining test step to recessed light fixture and carry out second step followed by the insertion of test
The quantity of formula lamps and lanterns realizes the preliminary screening to recessed light fixture, saves time and cost；
Further, in order to more accurately test recessed light fixture, in the step S120 of above-described embodiment, lead to
Cross the step of block stamp applies pressure to elastic cushion, further includes:
The vertical axes of block stamp are aligned by step S410 with the geometric center of recessed light fixture；
Step S420 applies pressure to elastic cushion by the block stamp after alignment.
Here, after by alignment function, the application pressure that can guarantee that recessed light fixture obtains is more uniform, and then can
Obtain more accurate test result；
Further, on the basis of the above embodiment, it is further ensured that and applies stressed uniformity, further includes:
Step S510 applies stressed speed no more than 5000N/min to elastic cushion by block stamp.
Further, in the step S120 of above-described embodiment, dead load can be born to the reality of recessed light fixture and surveyed
The step of examination, comprising:
It is quiet to know that the reality of recessed light fixture can be born according to the actual pressure that block stamp applies elastic cushion by step S610
Load；
Step S620 is compared can actually bear dead load with preset standard dead load；
Step S630, in the case where can actually bear dead load not less than preset standard dead load, recessed light fixture
Test result is qualified；
Step S640 can actually bear dead load less than standard dead load, and the test result of recessed light fixture is unqualified.
The embodiment of the present invention is by light shell outer cover, the structural parameters of installation part upper surface, the elasticity to be matched using convex-concave
Pad, using present invention method carry out parameter design elastic cushion size be greater than light shell outer cover size, and on installation part
The size on surface matches, embedded so as to which block stamp can be evenly distributed in the pressure approximation of application by elastic cushion
On lamps and lanterns, so that the measurement data of static load more true and accurate.
The computer program product of the test method of recessed light fixture provided by the embodiment of the present invention, including store journey
The computer readable storage medium of sequence code, the instruction that said program code includes can be used for executing institute in previous methods embodiment
The method stated, specific implementation can be found in embodiment of the method, and details are not described herein.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description
It with the specific work process of device, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
The embodiment of the present invention also provides a kind of electronic equipment, including memory, processor and storage are on a memory and can
The computer program run on a processor, processor realize recessed lighting fitting provided by the above embodiment when executing computer program
The step of test method of tool.
The embodiment of the present invention also provides a kind of computer readable storage medium, and meter is stored on computer readable storage medium
Calculation machine program, the step of test method of the recessed light fixture of above-described embodiment is executed when computer program is run by processor.
Finally, it should be noted that embodiment described above, only a specific embodiment of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, those skilled in the art should understand that: anyone skilled in the art
In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection of the invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of test method of recessed light fixture characterized by comprising
Elastic cushion is covered on to the surface of recessed light fixture, wherein the light shell outer cover of the elastic cushion and the recessed light fixture
Match with the parameter of installation part upper surface；
Pressure is applied to the elastic cushion by block stamp, dead load can be born to the reality of the recessed light fixture and tested.
2. the test method of recessed light fixture according to claim 1, which is characterized in that it is described elastic cushion is covered on it is embedding
The surface for entering formula lamps and lanterns includes:
Choose the elastic cushion to match with the parameter of the light shell outer cover of the recessed light fixture and installation part upper surface, the parameter
Including one of shape, diameter length and surface area or a variety of；
The elastic cushion is covered on to the surface of the recessed light fixture, so that the light of the elastic cushion and the recessed light fixture
Source shell and installation part upper surface intimate contact.
3. the test method of recessed light fixture according to claim 1, which is characterized in that it is described by block stamp to the bullet
Property pad apply pressure include:
Dead load can be born according to the theory that the parameter calculates the recessed light fixture；
In the case where the theory can bear dead load not less than preset standard dead load, the elastic cushion is applied by block stamp
Plus-pressure.
4. the test method of recessed light fixture according to claim 1, which is characterized in that described to the recessed light fixture
Reality can bear dead load carry out test include:
According to the actual pressure that the block stamp applies the elastic cushion, know that the reality of the recessed light fixture can bear static load
Lotus；
The reality can be born dead load to be compared with preset standard dead load；
In the case where the reality can bear dead load not less than the preset standard dead load, the survey of the recessed light fixture
Test result is qualified；
Dead load can be born less than the standard dead load in the reality, and the test result of the recessed light fixture is unqualified.
5. the test method of recessed light fixture according to claim 1, which is characterized in that the upper surface of the installation part with
The corner cut of the light shell outer cover is greater than 35 degree；
And/or
The diameter length of the lower surface of the installation part is greater than the diameter length on the bottom edge of the light shell outer cover.
6. the test method of recessed light fixture according to claim 1 or 3, which is characterized in that it is described by block stamp to institute
Stating elastic cushion application pressure includes:
The vertical axes of block stamp are aligned with the geometric center of the recessed light fixture；
Pressure is applied to the elastic cushion by the block stamp after alignment.
7. the test method of recessed light fixture according to claim 1 or 3, which is characterized in that it is described by block stamp to institute
Stating elastic cushion application pressure includes:
Stressed speed is applied no more than 5000N/min to the elastic cushion by block stamp.
8. the test method of recessed light fixture according to claim 1, which is characterized in that the structural parameters of the block stamp with
The elastic cushion matches.
9. the test method of recessed light fixture according to claim 1, which is characterized in that the elastic cushion with a thickness of 10
Millimeter.
10. the test method of recessed light fixture according to claim 3, which is characterized in that the method also includes:
In the case where the theory can bear dead load less than the preset standard dead load, the test of the recessed light fixture
As a result unqualified.
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