CN107449791A - A kind of the cannot-harm-detection device and its method of carbon fibre composite wire plug - Google Patents

A kind of the cannot-harm-detection device and its method of carbon fibre composite wire plug Download PDF

Info

Publication number
CN107449791A
CN107449791A CN201710818892.XA CN201710818892A CN107449791A CN 107449791 A CN107449791 A CN 107449791A CN 201710818892 A CN201710818892 A CN 201710818892A CN 107449791 A CN107449791 A CN 107449791A
Authority
CN
China
Prior art keywords
arm
detection
plug
harm
ray
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.)
Pending
Application number
CN201710818892.XA
Other languages
Chinese (zh)
Inventor
朱波
梁轩伟
于宽
乔琨
王永伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Huadian Yuntong Power Technology Co Ltd
Shandong University
Original Assignee
Beijing Huadian Yuntong Power Technology Co Ltd
Shandong University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beijing Huadian Yuntong Power Technology Co Ltd, Shandong University filed Critical Beijing Huadian Yuntong Power Technology Co Ltd
Priority to CN201710818892.XA priority Critical patent/CN107449791A/en
Publication of CN107449791A publication Critical patent/CN107449791A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00Investigating materials by wave or particle radiation
    • G01N2223/03Investigating materials by wave or particle radiation by transmission
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00Investigating materials by wave or particle radiation
    • G01N2223/10Different kinds of radiation or particles
    • G01N2223/101Different kinds of radiation or particles electromagnetic radiation
    • G01N2223/1016X-ray
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00Investigating materials by wave or particle radiation
    • G01N2223/30Accessories, mechanical or electrical features
    • G01N2223/33Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts
    • G01N2223/3303Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts object fixed; source and detector move
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00Investigating materials by wave or particle radiation
    • G01N2223/60Specific applications or type of materials
    • G01N2223/646Specific applications or type of materials flaws, defects

Abstract

The invention discloses a kind of the cannot-harm-detection device and its method of carbon fibre composite wire plug.The device includes lead protection room, its bottom plate both sides is respectively arranged with fixing support rack, a C-arm rotating device is mounted on each fixing support rack, the two C-arm rotating devices are connected by guide rail, C-arm is provided with guide rail, C-arm can be slided along guide rail and rotated along C-arm rotating device simultaneously;It is additionally provided with close to one of fixing support rack and on the bottom plate of lead protection room the workpiece holder for placing sample plug;The both ends of C-arm are respectively fixed with X-ray tube and X ray flat receiver, C-arm is used to ensure that the center of X-ray tube, sample plug and X ray flat receiver is respectively positioned on same horizontal line, after X-ray tube transmitting X ray is started, through sample plug center and by X ray flat receiver reception signal, linked simultaneously by the translation and rotation of C-arm, realize the lossless detection of Multi-angle omnibearing.

Description

A kind of the cannot-harm-detection device and its method of carbon fibre composite wire plug
Technical field
The invention belongs to the detection field of wire plug, more particularly to a kind of carbon fibre composite wire plug is lossless Detection means and its method.
Background technology
Traditional high voltage electricity transmission conductive wire is steel-cored aluminium strand, and as high-tension line is to non-deformability, resistance to environmental change Many requirements of ability and service life, the high voltage electricity transmission conductive wire structure of advanced composite material (ACM) material are increasingly becoming power system The focus of research.Carbon fiber is a kind of with high specific strength, high ratio modulus, the material with a variety of specific functions such as conduction, heat conduction Matter, using carbon fiber and the high-performance composite materials of the compound preparation of high performance resin in each neck such as industrial, civilian and military project There is important application in domain, specific to power domain, the wire plug prepared using carbon fibre composite, has itself higher Intensity, rigidity and high and low temperature environment adaptability, therefore the transmission of electricity fiber arc between overlength distance shaft tower can be effectively reduced Hang down, extend the service life of high-voltage conducting wires.Therefore at present, aluminium is matched somebody with somebody by the use of carbon fibre composite as the mandrel outer of transmission pressure Composite high pressure cable arrangement prepared by twisted wire, turn into the new substituted product of original all-metal material high voltage cable, effective solution Service life of having determined and many quality problems.
As the wire plug of composite material quality, using and be also faced with problems in scaffold line process:Example Such as in work progress is assembled, during the wire plug of composite material quality matches somebody with somebody aluminum stranded conductor in stringing or outside, composite construction Surface and it is internal inevitably sustain damage, and be not easy to be detected the defects of composite core rod inside composite construction Arrive, and to find these defects and timely processing or change product be also ensure transmission of electricity quality highly important work.It is real Existing this regular maintenance or fault localization work, carrying out manual structure, to tear analysis open clearly unpractical, it is therefore desirable to uses Any special measures, using contactless or not damaged formula structure detection operations.
The application that X-ray detection technology is used for the lossless detection of various structures is long-standing, in the nothing of composite structure Also there is the experience of many maturations in the application of breakdown diagnosis, and as the high-voltage conducting wires of composite construction, run into continuous length Sandwich construction be generally divided into:1. aluminum stranded conductor/the double-layer structure of carbon fibre composite wire plug, 2. connection gold utensil/aluminium twist The three-decker of line/carbon fiber composite core bar, 3. strain clamp combining structure/carbon fibre composite wire plug it is more Rotating fields.
But existing the cannot-harm-detection device is complicated and can not realize the lossless detection of Multi-angle omnibearing.
The content of the invention
In order to solve the deficiencies in the prior art, first aspect of the embodiment of the present invention provides a kind of carbon fibre composite and led The cannot-harm-detection device of core rod, its is simple in construction and can realize to the multi-angle of carbon fibre composite wire plug without dead The comprehensive lossless detection at angle.
The cannot-harm-detection device for the carbon fibre composite wire plug that first aspect of the embodiment of the present invention provides, including:
Lead protection room, its bottom plate both sides are respectively arranged with fixing support rack, and a C is mounted on each fixing support rack Arm rotating device, the two C-arm rotating devices are connected by guide rail, and C-arm is provided with the guide rail, and C-arm can be same When slide along guide rail and rotated along C-arm rotating device, realize that the translation of C-arm links with rotation;Close to one of fixed Support frame and the workpiece holder for placing sample plug is additionally provided with the bottom plate of lead protection room;The two of the C-arm End is respectively fixed with X-ray tube and X ray flat receiver, and C-arm is used to ensure that X-ray tube, sample plug and X ray are put down The center of plate receiver is respectively positioned in same horizontal line, after X-ray tube transmitting X ray is started, through sample plug center simultaneously Linked by X ray flat receiver reception signal, while by the translation and rotation of C-arm, realize the nothing of Multi-angle omnibearing Damage detection.
With reference to the embodiment of the present invention in a first aspect, in the first embodiment of the first aspect of the embodiment of the present invention, The side of lead protection room and top surface are detachable.
In the first embodiment with reference to the first aspect of the embodiment of the present invention, on one of side of lead protection room It is provided with and picks and places workpiece window.
It is equal at four angles of top surface of lead protection room in the first embodiment with reference to the first aspect of the embodiment of the present invention Provided with suspension ring.
In the first embodiment with reference to the first aspect of the embodiment of the present invention, at four angles of bottom plate of lead protection room also Supporting leg is provided with, roller is additionally provided with the supporting leg.
With reference to the embodiment of the present invention in a first aspect, in second of embodiment of the first aspect of the embodiment of the present invention, The lead protection room uses steel-lead-steel clamp Rotating fields, and inwall is the framework that square tubes soldering forms, and inside is provided with illumination and 220V Power outlet.
With reference to the embodiment of the present invention in a first aspect, in the third embodiment of the first aspect of the embodiment of the present invention, The C-arm rotating device includes gear, and the gear is connected with motor.
In the third embodiment with reference to the first aspect of the embodiment of the present invention, the anglec of rotation of the gear for ± 45°。
With reference to the embodiment of the present invention in a first aspect, in the 4th kind of embodiment of the first aspect of the embodiment of the present invention, The material of the workpiece holder is nylon.The material does not block ray.
Second aspect of the embodiment of the present invention provides a kind of the cannot-harm-detection device of carbon fibre composite wire plug Detection method.
The detection of the cannot-harm-detection device for the carbon fibre composite wire plug that second aspect of the embodiment of the present invention provides Method, including:
(1) sample plug is fixed on workpiece holder;
(2) the overall orientation of workpiece holder is adjusted, ensures to be located at the X-ray tube and flat receiver at C-arm both ends In same horizontal line;
(3) C-arm both ends X-ray tube and the horizontal range of flat receiver are adjusted according to the radial dimension of sample plug;
(4) X-ray tube transmitting X ray is opened, is linked by the translation in X-type arm rotation unit and rotation, along wire Axis direction carry out horizontal X-ray scanning, while ± 45 ° of direction rotation sweeps are realized by rotary part, realized to sample The Multi-angle omnibearing X-ray detection of plug;
(5) X-ray tube is closed, takes out sample plug, the detection of a sample plug is completed, and carries out next sample plug Detection.
Compared with prior art, the beneficial effects of the invention are as follows:
The cannot-harm-detection device of the carbon fibre composite wire plug of the present invention uses track transmission combination device, passes through C-arm, C-arm rotating device are applied in combination, and the combinations of two kinds of actions of translation of the X ray along wire axis and rotation can be achieved Realize, while the detection range between X ray and flat receiver can be adjusted, realize to carbon fibre composite wire plug Comprehensive lossless detection of the multi-angle without dead angle.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.
Fig. 1 is the structural representation of the cannot-harm-detection device of the carbon fibre composite wire plug of the present invention.
Wherein:1st, lead protection room;2nd, C-arm;3rd, X-ray tube;4th, flat receiver;5th, C-arm rotating device;6th, it is fixed Support frame;7th, guide rail;8th, workpiece holder;9th, sample plug.
Embodiment
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
The present invention penetrates metal material using high intensity X ray, directly observes the crackle in the composite plug of core Defect is simple, quick and very efficient nondestructive analysis detection mode.
Fig. 1 is the structural representation of the cannot-harm-detection device of the carbon fibre composite wire plug of the present invention.
As shown in figure 1, the cannot-harm-detection device of the carbon fibre composite wire plug of the present invention, including:
Lead protection room 1, its bottom plate both sides are respectively arranged with fixing support rack 6, one are mounted on each fixing support rack 6 Individual C-arm rotating device 5, the two C-arm rotating devices 5 are connected by guide rail 7, and C-arm 2, C is provided with the guide rail 7 Arm 2 can be slided along guide rail and rotated along C-arm rotating device 5 simultaneously, and the translation and rotation for realizing C-arm 2 link;Close to it In a fixing support rack 6 and the workpiece holder 8 for placing sample plug 9 is additionally provided with the bottom plate of lead protection room 1; The both ends of the C-arm 2 are respectively fixed with X-ray tube 3 and X ray flat receiver 4, C-arm 2 be used to ensureing X-ray tube 3, The center of sample plug 9 and X ray flat receiver 4 is respectively positioned in same horizontal line, launches X ray when starting X-ray tube 3 Afterwards, through the center of sample plug 9 and by the reception signal of X ray flat receiver 4, while joined by the translation and rotation of C-arm 2 It is dynamic, realize the lossless detection of Multi-angle omnibearing.
In a specific embodiment, the size of lead protection room 1 can be in long 1000-3000mm, wide 910-2100mm, height It is adjusted flexibly between 910-2100mm.
And the side of lead protection room 1 and top surface are detachable.
It is provided with one of side of lead protection room 1 and picks and places workpiece window.
For convenience of lifting and carrying, suspension ring are equipped with four angles of top surface of lead protection room 1.
Supporting leg is additionally provided with 1 bottom plate, four angles of lead protection room, roller is additionally provided with the supporting leg.
The radiation protection of lead protection room 1 meets national standard.
Specifically, the lead protection room uses steel-lead-steel clamp Rotating fields, and inwall is the framework that square tubes soldering forms, internal Provided with illumination and 220V power outlets.
Wherein, the C-arm rotating device includes gear, and the gear is connected with motor.
The anglec of rotation of the gear is ± 45 °.
In another embodiment, the material of the workpiece holder is nylon.The material does not block ray.
The cannot-harm-detection device of the carbon fibre composite wire plug of the present invention uses track transmission combination device, passes through C-arm, C-arm rotating device are applied in combination, and the combinations of two kinds of actions of translation of the X ray along wire axis and rotation can be achieved Realize, while the detection range between X ray and flat receiver can be adjusted, realize to carbon fibre composite wire plug Comprehensive lossless detection of the multi-angle without dead angle.
The cannot-harm-detection device of the carbon fibre composite wire plug of the present invention, can be achieved to be easy to carry, lead protection room Controlled using electric device, the convenient discrepancy of sample can be achieved, while lead door interlocks with X ray high-voltage control circuit, it is independent Safety switch can prevent door from being opened in detection process or start ray when door is opened or is not shut, detect protection safety It is high.
Present invention also offers the detection method of the cannot-harm-detection device of carbon fibre composite wire plug.
Specifically, the detection method of the cannot-harm-detection device of carbon fibre composite wire plug includes:
(1) sample plug is fixed on workpiece holder;
(2) the overall orientation of workpiece holder is adjusted, ensures to be located at the X-ray tube and flat receiver at C-arm both ends In same horizontal line;
(3) C-arm both ends X-ray tube and the horizontal range of flat receiver are adjusted according to the radial dimension of sample plug;
(4) X-ray tube transmitting X ray is opened, is linked by the translation in X-type arm rotation unit and rotation, along wire Axis direction carry out horizontal X-ray scanning, while ± 45 ° of direction rotation sweeps are realized by rotary part, realized to sample The Multi-angle omnibearing X-ray detection of plug;
(5) X-ray tube is closed, takes out sample plug, the detection of a sample plug is completed, and carries out next sample plug Detection.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.

Claims (10)

  1. A kind of 1. the cannot-harm-detection device of carbon fibre composite wire plug, it is characterised in that including:
    Lead protection room, its bottom plate both sides are respectively arranged with fixing support rack, and a C-arm is mounted on each fixing support rack Rotating device, the two C-arm rotating devices are connected by guide rail, are provided with C-arm on the guide rail, and C-arm can edge simultaneously Guide rail is slided and rotated along C-arm rotating device, and the translation and rotation for realizing C-arm link;Close to one of fixed support Frame and the workpiece holder for placing sample plug is additionally provided with the bottom plate of lead protection room;The both ends of the C-arm point X-ray tube and X ray flat receiver are not fixed with, and C-arm is used to ensure X-ray tube, sample plug and X ray board joint The center for receiving device is respectively positioned in same horizontal line, after X-ray tube transmitting X ray is started, is penetrated through sample plug center and by X Line flat receiver reception signal, while linked by the translation and rotation of C-arm, realize the lossless spy of Multi-angle omnibearing Survey.
  2. 2. the cannot-harm-detection device of carbon fibre composite wire plug as claimed in claim 1, it is characterised in that lead protection The side of room and top surface are detachable.
  3. 3. the cannot-harm-detection device of carbon fibre composite wire plug as claimed in claim 2, it is characterised in that lead protection It is provided with one of side of room and picks and places workpiece window.
  4. 4. the cannot-harm-detection device of carbon fibre composite wire plug as claimed in claim 2, it is characterised in that lead protection Suspension ring are equipped with four angles of top surface of room.
  5. 5. the cannot-harm-detection device of carbon fibre composite wire plug as claimed in claim 2, it is characterised in that lead protection Supporting leg is additionally provided with four angles of bottom plate of room, roller is additionally provided with the supporting leg.
  6. 6. the cannot-harm-detection device of carbon fibre composite wire plug as claimed in claim 1, it is characterised in that the lead Guard chamber uses steel-lead-steel clamp Rotating fields, and inwall is the framework that square tubes soldering forms, and inside is provided with illumination and 220V power supplys are inserted Seat.
  7. 7. the cannot-harm-detection device of carbon fibre composite wire plug as claimed in claim 1, it is characterised in that the C Arm rotating device includes gear, and the gear is connected with motor.
  8. 8. the cannot-harm-detection device of carbon fibre composite wire plug as claimed in claim 7, it is characterised in that the tooth The anglec of rotation of wheel is ± 45 °.
  9. 9. the cannot-harm-detection device of carbon fibre composite wire plug as claimed in claim 1, it is characterised in that the work The material of part support frame is nylon.
  10. 10. a kind of the cannot-harm-detection device of carbon fibre composite wire plug as claimed in any one of claims 1-9 wherein Detection method, it is characterised in that including:
    (1) sample plug is fixed on workpiece holder;
    (2) the overall orientation of workpiece holder is adjusted, is ensured with the X-ray tube and flat receiver at C-arm both ends positioned at same On horizontal line;
    (3) C-arm both ends X-ray tube and the horizontal range of flat receiver are adjusted according to the radial dimension of sample plug;
    (4) X-ray tube transmitting X ray is opened, is linked by the translation in X-type arm rotation unit and rotation, along the axle of wire Line direction carries out horizontal X-ray scanning, while realizes ± 45 ° of direction rotation sweeps by rotary part, realizes to sample plug Multi-angle omnibearing X-ray detection;
    (5) X-ray tube is closed, takes out sample plug, the detection of a sample plug is completed, and carries out the inspection of next sample plug Survey.
CN201710818892.XA 2017-09-12 2017-09-12 A kind of the cannot-harm-detection device and its method of carbon fibre composite wire plug Pending CN107449791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710818892.XA CN107449791A (en) 2017-09-12 2017-09-12 A kind of the cannot-harm-detection device and its method of carbon fibre composite wire plug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710818892.XA CN107449791A (en) 2017-09-12 2017-09-12 A kind of the cannot-harm-detection device and its method of carbon fibre composite wire plug

Publications (1)

Publication Number Publication Date
CN107449791A true CN107449791A (en) 2017-12-08

Family

ID=60496241

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710818892.XA Pending CN107449791A (en) 2017-09-12 2017-09-12 A kind of the cannot-harm-detection device and its method of carbon fibre composite wire plug

Country Status (1)

Country Link
CN (1) CN107449791A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110137846A (en) * 2019-05-14 2019-08-16 国网江苏省电力有限公司电力科学研究院 Aerial carbon-fibre wire detection robot and multi-angle method of detection
CN110653733A (en) * 2019-08-28 2020-01-07 何冬辉 Clamping mechanism for nondestructive testing
CN110675721A (en) * 2019-09-30 2020-01-10 鸿蒙能源(山东)有限公司 Multi-working-condition hot dry rock geothermal exploitation simulation equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110137846A (en) * 2019-05-14 2019-08-16 国网江苏省电力有限公司电力科学研究院 Aerial carbon-fibre wire detection robot and multi-angle method of detection
CN110653733A (en) * 2019-08-28 2020-01-07 何冬辉 Clamping mechanism for nondestructive testing
CN110675721A (en) * 2019-09-30 2020-01-10 鸿蒙能源(山东)有限公司 Multi-working-condition hot dry rock geothermal exploitation simulation equipment

Similar Documents

Publication Publication Date Title
CN107449791A (en) A kind of the cannot-harm-detection device and its method of carbon fibre composite wire plug
CN205941241U (en) Wire flexural fatigue life testing machine
CN103219103B (en) Extra-high-voltage direct current binodal composite insulator and pressure welding method of hardware fittings and core rods thereof
CN207133207U (en) A kind of the cannot-harm-detection device of carbon fibre composite wire plug
CN105954659A (en) Insulated rope voltage-withstand test device
CN102565106B (en) Device for improving GIS on-site X-ray shooting efficiency
CN207163820U (en) A kind of cable production stretching-machine
CN205192984U (en) Transmission line combined material shaft tower nondestructive test device
CN204789734U (en) Electrician's utensil is tested to portable high pressure
CN210036772U (en) Safe efficient electronic product detection device
CN101876644B (en) Sensing device used for monitoring pulverized coal concentration
CN207748668U (en) A kind of earthquake-capturing cable wrapping head
CN208707056U (en) A kind of fixed device of cable connection
CN205861842U (en) A kind of 252KV GIS pressure frock of isolation insulated tension pole
CN110487817A (en) A kind of mobile monitor station of ageing-resistant flame-proof power cable
CN207036993U (en) A kind of transmission line fault detector
CN207890816U (en) A kind of electric wire draft gear
CN206405572U (en) A kind of penstock welds earthing or grounding means
CN105352981A (en) Electric transmission line composite material tower nondestructive testing device
CN202735452U (en) Leakage current detection apparatus for insulating type high altitude construction vehicles
CN206002568U (en) Lightning arrester live-line test connecting rod
CN209561775U (en) A kind of high-voltage wiring harness shielding construction
CN113484150B (en) Heat-insulation type cable tension testing device for cable for electric power control
CN211293139U (en) Safety device for measuring breakdown field intensity of cable material
CN207233960U (en) A kind of novel high-pressure ground wire

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination