1L 73. 100. 99
Requisition No.: 16787-2005
Coal Industry Standard of the People's Republic of China
MT/T356-—2005
Generation 136-194
Irill Rig for safe cngineering in coal mine2005-09-23Released
National Development and Reform Commission
2006-02-01Implementation
Planning and application documents
Classification, model and number
Test decision
Interface supervision rules
Signs and driving tables, transmission and input busy hall
MT/T356—20CE
MT/1356—2UJ5
This standard is a revision of M7/356—1994: In the difference between MT/355—194 and the main internal passengers, the front-end internal passengers are increased, and the necessary revisions and supplements are made to some internal wear to meet the requirements of completeness, strict review, quality and implementation. Compared with MT/T355-4, the main changes of this standard are as follows: 1. The standard is changed to "underground mining machine", which makes the concept of batching more precise. 2. Based on GB/T1.12000* standard, Part 1: Standard specifications for the test of phases and phases of the standard is compiled, and the supplementary parts can be used as standards.
1. M1/T.-S5 mining machine and electrical product types and management regulations, added the classification, model and parameters,
5. Add safety requirements and become the content of this standard. 5. Supplement some clauses in the performance requirements and make them the content of the fourth table of this standard: 7. Supplement the "requirements for small and medium-sized comparison tests" in Section 4 of this standard and make it the content of Section 5 of this standard. More, add "inspection rules" "small \ requirements" and "implementation method" of the world, the first paragraph of this standard. The publication of the first chapter, the macro standard is proposed by the China Coal Industry Development Office to establish a standard for the coal mine safety technical requirements of the coal industry. This standard is related to the coal scientific research institute. The main contributors to the standard are: Zhang Zhuangzhi, Gong Qingfeng, Xi Wenqing, Li Huatu Zhihong, Wei Gelin, Yun Standard 1J!1 Niu 12 pieces of the first agricultural cloth.
Coal mine underground safety engineering drilling rig
M1/T:356-2005
This standard is completed for coal mines The classification, models and parameters of underground safety three-stage drilling rigs (hereinafter referred to as drilling rigs). Requirements, operation and inspection methods, inspection regulations, markings, packaging, transportation and storage. This standard applies to drilling rigs used for underground safety engineering purposes, such as drilling rigs for implementing dead-water extraction, layer water extraction, water exploration and discharge, fire prevention, etc. and other engineering purposes:
2 Normative referenced documents
The following documents are cited in this standard and become the references to this standard. Please note that the date of the reference is a document of document citation, and all subsequent amendments (not including those in the activity) or revisions are not applicable to this standard. However, if there is a lack of reference, please refer to the referenced documents. This standard is a reference document of the periodic table. The latest version of the document that has been discussed by all parties is not applicable. The latest version applies to the previous standard. 6H376 General technical specifications for filter pressure cables
GB383.1 Electrical equipment for use in explosive gas environments Part 2: Flame retardant type "CB3836.3 Electrical equipment for use in explosive gas environments Part 2: Flame retardant type \G33836.4 Electrical equipment for use in explosive gas environments Part 4: Intrinsically safe type \57U3 Liquid-cooled electrical equipment
Special technical specifications for use with explosive gas environments Machine number hope son into random sampling method H1 2 33 plan electric product package transfer call technical conditions GB38I coal mine metal material science and technology enterprise giant test method and regulations BT191 mechanical machining parts tracking technical conditions MT9% 184 relatively large bracket rubber assembly and middle joint group type test specification MT113 baking ore opening polymer products flame retardant resistance also general test method and judgment is see M/14.1 coal mine machine core wide product type control and consulting method MT3741994 flame retardant rail static industry V-belt test method and specification 3 classification, model and reference
3. 1 classification
Drilling rigs are divided into electric drilling rigs according to the driving effect, compressor and thrust structure of the power, business! There are three types of drilling rigs: electric drilling rigs and pneumatic drilling rigs. The electric drilling rig is a drilling rig with a motor-driven rotary device and a hydraulic rotary device and a thrust mechanism. The pneumatic drilling rig is a drilling rig driven by an air-driven device and a thrust mechanism. The electric drilling rig is divided into two types: hydraulic drilling rig and hydraulic drilling rig. Among them, the hydraulic drilling rig is a drilling rig with an electric motor-driven rotary device and a hydraulic reverse mechanism. 3.2 Models
3.2.1 The machine number shall comply with the provisions of MT/151.1. 3.2.2 Model matching:
M[/T 356—2005
3.2.3 Indicate
Your serial number. If the uppercase letter is appropriate, the type of therapeutic dance A ((.… indicates a social code, and the first special code of the enterprise must be used to distinguish between the time and the time. Please use the uppercase letter to indicate
main parameters, sales machine main phase device large shot out matrix, the same Arabic self-number indicates, unit entry, school…common one special certificate indicates professional, add the timing of the sex of the play to purchase special line, distinguish the inflammation plan production, H people write no production demolition people indicate
first characteristic code, use uppercase Write the effect of the mother, Y only represents \motor type "fluid pressure type", "pneumatic"
armored machine, only the letter 2 represents
Y-toEC
a horse seeks
parameters and has technical effect and teaching effect.
technical parameters are shown in Table 2,
electric drilling rig
machine excitation
force (straight
swimming opening system
object: transfer
running distance
method is force
select speed
garbage note ratio
wide note line
...ur.
open machine
gas drill!
anti technology multi-product
know the customer is relatively successful bid
Yinglai industry
low gas!
new gas institute
child's dynamic hitting clinical
North dynamic hitting claw
note: ", "book shows that there are North items"
" indicates research items
station The main parameters of the machine are output torque
Table 1<pan>
Electric type
Mechanical type
Stationary machine with bending speed function, its output speed and given speed should be listed separately, 3.3.4
Stationary machine
Model name is the full name of the machine. In the official documents, the full name must be used when the model is published. 4. The full name must be used when the model is published. 4. 1. 1
MT/T356—2C05
Pneumatic station structure
4.1.2 This standard specifies the technical requirements for the materials used in the manufacture and the welding parts and external parts shall comply with the relevant national standards and industry standards. The machine 14 shall comply with the requirements of 36 standards, and the components of the system shall meet the requirements of B6 and 4.1.3
The manufactured parts and external parts shall be inspected and qualified, and the purchased parts can be used. All hydraulic parts, including the inlet and outlet of the pipeline, shall be equipped with military or other protective devices. The use rate of the support and dyeing work should be marked, and the mark should be used to ensure that the author is safe and reliable. 4.1.5
The marked characters and colors should match the F line style, village long 1, 7 connection semi-solid, reliable
4.1. There is a safety meter at the head of the pipe network, and the identification mark 12 safety requirements
4.2.1 The motor and A decay electrical appliances that are out of use should comply with the provisions of GP3336.1B3XS.2.12Hm.3.GH385. Only the quality certificate and safety enterprise mark issued by the authorized national organization are valid. The machine that is out of use while the forklift is working must be used quickly
4.2.2 The exposed parts are made of double-layer enterprise materials. , the industry complies with the provisions of (14/T138:3, the home investment structure shall be inspected and tested for sparks and rot, and there shall be a test certificate, and the production is valid, 4.2.3 The number of heads used shall comply with the current provisions of MT35, 4.2.4 The transmission belts shall comply with the provisions of M137=. L.2.5 The construction and rubber hoses and transmission belts shall comply with the provisions of 3, 4.2.6 The parts that may cause personal injury during operation shall not be installed or used as protective equipment, MI/T356-2005
4.3 Appearance requirements
4.31 The exposed parts shall not be defective with flash, thorns, damage, etc., and shall not be painted with uneven surfaces, and shall be smooth. 4.3.2 The exposed surface should be treated with a rust-proof coating, or the bearing parts that cannot be rust-proof should be treated with a rust-proof coating, etc. 4.3.3 The color of the paint should be uniform, without any defects such as peeling, rust, oozing, or air pools. 3.4 The color of the paint should be light,
4.3.5 If the direction of rotation needs to be changed, the direction of rotation should be changed. 4.4 Performance requirements
4.4.1 No-load operation
4.4.1.1 The forward and reverse operations of the return soft machine should be uniform, smooth, and without abnormal noise. The forward movement of the machine should be correct and the operation should be smooth. 4, 4, 1.2
4, 1. 1. 3
The upper plate holder is open and closed evenly, and the size of the drill pipe should be able to pass the closing seal according to the standard
4. 4. 1. 4
4. 4. 1. 5
4, 4. 1.6
The angle adjustment is even, the multi-machine mechanism is correct, and there is no abnormal noise: the oil and fire protection device should be able to move smoothly and accurately. The rope case or the whole machine should be semi-stable after the rotation, without sound and system shock, the pressure of the hydraulic bell is not within the specification, the pressure system should comply with the (B3766 specification) complete section. The operating handle should be flexible, and the operation points should be correct and reliable. 4.4.1.8
All required firmware should not be loose..
4.2.1.19 The system should not be slipped.
4. 4.1.17 The water cooling system has no water leakage or water leakage. 4.1.12 The pneumatic components have no air leakage. 4.4.2 Under load operation, the actual rotation speed of the main shaft shall not be less than the given value. The rotation speed shall be stable, without abnormal vibration, impact, dynamic and fluid (gas) phenomenon. 4.4.3 Overload operation When the new machine is tested, each rotating machine shall be All should run smoothly and normally without abnormal noise, vibration and leakage (gas). 44.4 When the propulsion mechanism is idle, the thrust and starting speed and the starting speed should not be less than 10% of the initial value: under rated working conditions, the thrust and starting speed should be less than 5% of the given value or less than the given value for 12 hours (the engine is allowed to adjust the thrust and starting speed for 4 hours). 2. 5 Overall efficiency 1. The actual working efficiency of the drilling and expanding machine is not lower than the rated efficiency. Table 2 Energy specifications Table 2 Return to the service department Do not output the overall efficiency, 4.4.6 Card alliance. Clamp. Electric mold. Machine hydraulic)
Shape transmission
Special wheel stepping
Reduction type
disk, optical expander energy test size, output torque loading 15% of the vehicle age, optical tight drilling industry large slip phenomenon. 4.4.7 When testing the fixing mechanism, the force of the fixing mechanism shall not be less than 75% of the given value: the filter element of each solvent shall not be full, and the permanent deformation of other parts shall be tested. 1.4.3 Lifting mechanism: All offline vehicles shall be tested for both lifting and opening capacity, and the lifting and opening capacity shall not be less than the given value, and the lifting and opening capacity shall not exceed the given value by more than 10%. Elimination: The winch or opening and lowering mechanism must be operated strictly, and there shall be no sliding phenomenon on the rollers and the guide. 4.4.9 Noise When the machine is running at rated operating pressure, the operating value shall not be greater than the provisions in Table 3: Table 3 Momentum dynamic noise, hydraulic noise, hydraulic noise, hydraulic power station output, HH(A) 4.4.10 Overflow rise 2>2.2--5.3-5.5.-.11 211~22 MI/I 356--2005 When the machine is running continuously at a constant frequency and in a thermal equilibrium state, the temperature rise of the fluid in the inverter box shall not exceed 1, and the maximum temperature of the machine surface shall not exceed 75 (the maximum temperature shall not exceed 85℃): Hydraulic system oil tank outlet is sensitive! The temperature of the test chamber shall not exceed 60℃. If there are special requirements, they shall be implemented in accordance with the specified standards. 4.4.11 Durability
4.2.11.1 Under rated working conditions, the cumulative drop shall not be less than 10℃ when running continuously without serious damage. 4.4.11.2 The damage phenomenon of general use shall not occur. 5 Test methods
5.1 Test instruments and meters
Test the instrument. The measuring core of the instrument shall be determined according to the size of the measured set. The calibration shall be carried out according to the actual selection. The accuracy and power shall be as follows:
Transformer: Reading error 1./mm:
Transformer error 10%:
Medium power test: Accuracy Class 1:
Current transformer: Accuracy.
And force meter: increase the difference 1.
Flow meter: securities%1.5%;
Transform into small division:
Ruler: small division 1m
Injection pressure sensor cooperates with vehicle resistance strain meter: send wasteland! Overview: Level b 2:
) force measurement difference 4.%
[stopwatch; small division value is 0. 1 8.
5,2 General requirements Check
5.7.14.1.1~4.1.3 requirements of the manufacturer to ensure, check the technical documents and related inspection and compilation requirements of 5.2.22.1.4.~1.1.9 and use special methods to check 5.3 Safety requirements Check
5.3.1 connect 1.2.:~.2.5 requirements review related documents, 5,3.2 connect 1\.5 requirements use two stations to compensate for changes. 5.4 Appearance inspection requirements
According to the requirements of 1.3, monthly test method inspection and:
MT/T356—2005
5.5 No-load test
5.5.1 When the rotary end is in the working and reverse gears, the other gears are in the reverse gear. The stepless speed regulating rotary device can be selected to rotate in three modes: low, medium and high. If there is a large abnormality, it should be recorded. 5.5.2 The machine should move forward, backward, and reset 3 times. 5.3 The total operation card is calculated, and the valve of the device is adjusted. The lower plate and the fire holder are checked and the state is closed: 3 times. 5.5.4 Operation angle adjustment mechanism inspection must be adjusted to adjust the machine's motion and adjustment range. To: 5.5.5 When the axis of the rotating box is in the vertical position, check that the account can be repeated 3 times. Check the rotation of the cable car or the ascending tunnel structure, operation, min.5.5.6
Observe the method of each power meter. 5.5.73
5.5. Month.4.1.8.~4.1..2 Record the requirements of the monthly plan method. 5.E Negative test
5.E, 1 When the electric and filter pressure station machine is tested, the power test and the city system end device will be used to carry the motor's grabbing model: When the pneumatic indicator machine is tested: the system is divided into the air intake and exhaust pipes of the air motor. The air is not too big: Ⅲ, install the pressure gauge, flow meter and thermometer 5.,? Use a tachometer and a tachometer to measure the torque and current of the auxiliary shaft of the rotor, and use a current transformer to measure the power of the motor, and use a thermometer to measure the humidity of the working fluid. The humidity of the hydraulic fluid should be within the range of 30~50℃ for the pressurized machine. 5.6.4 The whole shaft of the rotary machine must be tested with a speed sensor, and the rotation plan or installation is close to the customer's selected state. Under the same loading device, find the high speed setting value for half the service life of the motor. Select the three speed measurement methods. 5.6.5 or the operating condition of the light rotating mechanism. 5.6.G use the above measurement method to check the liquid (gas) pressure system for leakage. 5.7 Overload test
5.7.1 After the load test, carry out this test,
5.2. The rotary machine can operate at a given speed gear (the hydraulic and pneumatic drilling rig elements are allowed to adjust the system pressure), run for mi, measure the positive and reverse time, and confirm the transfer time. The motor can rotate for a short time and generate 3 times. 5.7.3 Check the running condition of the propulsion mechanism.
5.7.4 Check the sealing performance
5.8 Determination of the performance difference of the remote control mechanism
5.8.1 Connect the thruster and the control sensor (you can also use the same grease to make the tension and pressure gauges for ten times of testing). 5.8.2 When running without load: measure the thrust with a stopwatch and calculate the speed and the speed after the near-term process. Calculate the average value . Also 3 times. 5.8.? It is in the normal state, the thruster is lowered to the specified value, the thrust force is measured, the thrust force is not checked, the rig push mechanism is suitable for the market, the system is increased to the specified value 3 times
5.8.4, the system is increased to the specified value, the sequence is violated and the purchase is continued to operate in the limit position of the stroke. There is a light leak in the dense village,
5.9 The overall efficiency is set
5.5. Test work:
Energy machine efficiency determination, test new parts travel and put down the requirements: the motor common voltage wave is not large, the actual estimation is Huah) Motor selection mechanism 1. Work. H hydraulic soft system empty operation: relatively large car system lifting column single hold method rotation.
5. 9. 2 Test sequence:
Test sequence is the same as ..2,
5.9.3 Determination and calculation of drilling rig power 3: Electric drilling rig rail pressure drilling rig measurement and design of female machine input drilling rig and others: 5.9.4 Determination and calculation of output power of drilling rig rotary speed and torque of each gear (1 formula calculation of shrinkage rate: P
Force:
P: Drilling rig rotary main shaft reverse gear output rate, W: Staggered machine rotary main shaft each gear stop speed, min aluminum machine rotary upper shaft each gear output torque, ·. 5.9.5 Calculation of drilling rig efficiency:
According to formula 2,
Test;||tt| |Drilling efficiency:
The efficiency of a specific gear;
Total number of station speed gears:
The first gear The input power of the motor: the first, the first speed gear The measured output ground barrier. Long
59.6 hours to the level of the drill rig, the station machine micro-seat is measured in the middle of the speed: 5.10 chuck. Head holder performance specification
WT/T356-—2005
5.10.1 The chuck is tightened and the pin is eliminated. The sensor of the blade is a micro-torque meter. Read the variable series, the whole inquiry is loaded to 11 rated speed mountain drive operation 5 initial·downward drilling Pu, check the drilling table, 5.10.2 chuck and ash special device type tightening station meter, send new 1.5% of the effective rating of the car in March, continued 51:1, lower the drill, check the station, the surface should be smooth and slip deceleration.
www.bzxz.net5.11 Anchor strength test
5.11.1 The box is fixed with a tight ironing force and is expected to be loaded in the short-term test, 5.11.24h cable measurement, inspection set rate to small profit multiple parts 5.12 Lifting mechanism busy special rating
5.12.1 Standard steel wire pure printing between the force sense belt, with low lifting frequency should be still, test the rat jump density winch before the lifting machine average sheep lifting energy card. More practical,
5.12.? Rate car or monthly lifting 110% rated negative weight, at low speed to the weight The height of the object is not too small. The natural piece is checked for non-bubble gates. The object is waiting for the object to fall. The object can be quickly stopped. The inspection and analysis of the falling object are 1. Check the speed of the object. The inspection and analysis of the falling object will cause the vehicle and the lifting device to send off the product. Repeat
5.13 sound measurement and determination
5.13.1 Case sound measurement and research. The test items shall meet the following requirements: [the load carrier is high and cool, and the load is carried under certain working conditions) and the pit is not the same. The cable car or the lifting device is not used for transmission. 5.13.2 The sound transmission group horse ground 1.2 high-load large wheel sequence 1m distribution machine matching a red number of times the arithmetic output value E.13.3 body type meter, stop training 1 measurement point: a total of four points - ~ parts of the body type drilling ritual measurement according to the body part of the vehicle,
E. 13.1 Arithmetic average value, should be in accordance with: 1.2 Table 3, 7
MT/T356-2905
5,13.5 The back probe should be lower than the measured value by 1CdB(A) or more. When the back operating sound value is lower than the measured sound value by 1CdB(A), it shall be corrected according to step 4. The actual sound value is equal to the measured sound value correction value.
The difference between the actual sound value and the measured sound value is greater than the background noise!
5.14 Temperature rise test
5.4.1 Place the instrument in the pressure system tank and fill it with oil, and measure the overflow near the bearing outside the tank. 5.14.2 Continue to operate under constant temperature, and record the temperature every 10m until the temperature reaches the normal level. The machine with cooling water system is fully cooled and kept at a constant temperature.
5.14.3 The total flow rate is calculated at each temperature point. 5.15 Durability test
5.15.: The rotor is put out of the rotating state in the specified conditions. The cumulative rotation time of each component should not be less than 1003. 15.2 Parts (except heat exchangers) may be replaced during the trial period. The service time of the machine exceeds 2h. Inspection plan
Inspection classification
Cold inspection" inspection classification" inspection and certification plan,
6.2 Factory inspection
6.2.1 Before production, the factory shall inspect and accept the products, and only after the inspection is qualified and the certificate is issued, can they leave the factory. 6.2.2 The products shall be inspected as required. Table 5
General-requirement
Safety requirements
Table 5 ()
Gebi Gongmu
. 2. 1
Ancient-requirement
Air transport, etc.
Negative optional
Transmission
Lan Xun Kai Zhan
Durability of machine
4. 4. 1.2
4. 4. 1. 4
4, 4, 1. 4
4. 4. 1. E
4. 4. 1.
4, 4, 1. 7
1. 4. 1. H
4, 4. 1. 1k.
4, 4, 1, 11
2, 4, 1. 12
.. . 1
Design: "\", "·" is changed to "monthly", "one" means the initial inspection, 6.3 Type inspection
When the following information is produced, a systematic inspection is carried out: When a new product is trial-produced or an old product is transferred to the factory for production: After the formal production is stopped, the structure, materials, and process are slightly changed, which may affect the age of the machine. The factory often changes every 3 years
After 2 years of suspension of production: When the annual production inspection result is significantly different from the double type inspection result,13.1 The arithmetic mean value shall comply with the following provisions: 1.2 Table 3, 7
MT/T356-2905
5, 13.5 The back probe shall be lower than the measured sample by 1CdB(A) or more. When the back operating sound value is lower than the measured sound value by 1CdB(A), the correction shall be made according to 4. The actual sample sound value is equal to the sample output value correction value. The difference between the actual sample sound value and the background noise is greater than 5. 14 Temperature rise test
5.4.1 Place the meter in the oil tank of the pressure system and the oil tank, and measure the overflow near the bearing outside the tank. 5.14.2 Continue to operate under the condition of the bottle, and measure the temperature every 10 minutes until the heat is stable. Machines with cooling water system are fully cooled and kept at a constant temperature
5.14.3 Verify the total flow rate: calculate the temperature value at each point 5.15 Durability test
5.15.: The rotor is rotated in the specified conditions, and the cumulative rotation time of each element should not be less than 1003, 15.2 Parts (except for hot-rolled parts) can be replaced during the test period. If the intermediate machine time exceeds 2h, the inspection plan
Inspection classification
Peach inspection and cold inspection" inspection and certification planning inspection,
6.2 Factory inspection
6.2.1 Before production, the factory inspection department will inspect and accept the product. After the inspection is qualified and the certificate is issued, it is allowed to leave the factory. 6.2.2 The product should be inspected according to the specified inspection table. Table 5
General-Requirement
Safety Requirements
Table 5 ()
Specification of inspection items
. 2. 1
Gu Jiuqiu
Ku Ga Yun et al.
Negative optional
Jiu Yun Chuan
Lan Xun Kai Zhan
Adhesive machine durability
4. 4. 1.2
4. 4. 1. 4
4, 4, 1. 4
4. 4. 1. E
4. 4. 1.
4, 4, 1. 7
1. 4. 1. H
4, 4. 1. 1k.
4, 4, 1, 11
2, 4, 1. 12
.. . 1
Design: "·" is changed to "monthly", "one" means the initial inspection, 6.3 Type inspection
When the following information is produced, a systematic inspection is carried out: When a new product is trial-produced or an old product is transferred to the factory for production: After the formal production is stopped, the structure, materials, and process are slightly changed, which may affect the age of the machine. The factory often changes every 3 years
After 2 years of suspension of production: When the annual production inspection result is significantly different from the double type inspection result,13.1 The arithmetic mean value shall comply with the following provisions: 1.2 Table 3, 7
MT/T356-2905
5, 13.5 The back probe shall be lower than the measured sample by 1CdB(A) or more. When the back operating sound value is lower than the measured sound value by 1CdB(A), the correction shall be made according to 4. The actual sample sound value is equal to the sample output value correction value. The difference between the actual sample sound value and the background noise is greater than 5. 14 Temperature rise test
5.4.1 Place the meter in the oil tank of the pressure system and the oil tank, and measure the overflow near the bearing outside the tank. 5.14.2 Continue to operate under the condition of the bottle, and measure the temperature every 10 minutes until the heat is stable. Machines with cooling water system are fully cooled and kept at a constant temperature
5.14.3 Verify the total flow rate: calculate the temperature value at each point 5.15 Durability test
5.15.: The rotor is rotated in the specified conditions, and the cumulative rotation time of each element should not be less than 1003, 15.2 Parts (except for hot-rolled parts) can be replaced during the test period. If the intermediate machine time exceeds 2h, the inspection plan
Inspection classification
Peach inspection and cold inspection" inspection and certification planning inspection,
6.2 Factory inspection
6.2.1 Before production, the factory inspection department will inspect and accept the product. After the inspection is qualified and the certificate is issued, it is allowed to leave the factory. 6.2.2 The product should be inspected according to the specified inspection table. Table 5
General-Requirement
Safety Requirements
Table 5 ()
Specification of inspection items
. 2. 1
Gu Jiuqiu
Ku Ga Yun et al.
Negative optional
Jiu Yun Chuan
Lan Xun Kai Zhan
Adhesive machine durability
4. 4. 1.2
4. 4. 1. 4
4, 4, 1. 4
4. 4. 1. E
4. 4. 1.
4, 4, 1. 7
1. 4. 1. H
4, 4. 1. 1k.
4, 4, 1, 11
2, 4, 1. 12
.. . 1
Design: "·" is changed to "monthly", "one" means the initial inspection, 6.3 Type inspection
When the following information is produced, a systematic inspection is carried out: When a new product is trial-produced or an old product is transferred to the factory for production: After the formal production is stopped, the structure, materials, and process are slightly changed, which may affect the age of the machine. The factory often changes every 3 years
After 2 years of suspension of production: When the annual production inspection result is significantly different from the double type inspection result,
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