CN110926792A

CN110926792A - Multi-working-condition loaded reliability test device and method for cutting fluid centralized filtering system

Info

Publication number: CN110926792A
Application number: CN202010036359.XA
Authority: CN
Inventors: 杨海吉; 李国发; 何佳龙; 王立鼎; 张微; 周欣达
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2020-03-27
Anticipated expiration: 2040-01-14
Also published as: CN110926792B

Abstract

The invention discloses a reliability test device and a reliability test method for a cutting fluid centralized filtering system loaded under multiple working conditions, wherein the following test steps are completed through the reliability test device for the cutting fluid centralized filtering system: step 1: determining the structural composition of the tested cutting fluid centralized filtering system and the specification and model of each tested part, and completing the early preparation of the test; step 2: determining the load condition of the cutting fluid in the tested cutting fluid centralized filtering system; and step 3: performing a reliability test according to the standard; and 4, step 4: detecting related performance parameters in the cutting fluid centralized filtering system; and 5: and (4) processing data, and calculating a reliability function, a fault probability function and an average fault interval working time MTBF of the cutting fluid centralized filtering system. And the test period in single-working-condition or multi-working-condition simulation is reduced.

Description

Multi-working-condition loaded reliability test device and method for cutting fluid centralized filtering system

Technical Field

The invention relates to the technical field of mechanical test equipment and a mechanical test method, in particular to a device and a method for testing the reliability of a multi-working-condition loaded cutting fluid centralized filtering system.

Background

With the development of the modern machining technology towards green and intelligent directions, the cutting fluid system matched with the modern machining technology is also changed towards the direction of centralized filtering treatment of the cutting fluid characterized by automation, high quality assurance, environmental protection and energy conservation. At present, the production field of mass workpieces (such as automobile parts, bearings, super-finishing and the like) at home and abroad gradually starts to be changed from the traditional single-machine filtering mode to the centralized filtering mode. The cutting fluid centralized filtering system is a circulating system for carrying out centralized filtering treatment and supply on cutting fluids of a plurality of processing devices or 1 or a plurality of processing production lines, and mainly comprises a coarse filtering device, an oil-liquid separating device, a fine filtering device, a cutting fluid supplementing device and the like.

Once the quality of the cutting fluid is improperly controlled, the processing quality is greatly affected, the cutting fluid is quickly decomposed and deteriorated, the production cost is greatly increased due to frequent fluid replacement, and the expensive processing equipment can be corroded for a long time. The purpose and the target of the cutting fluid centralized filtration treatment system can be summarized as follows: providing cutting fluid meeting specific requirements for a machine tool or other processing equipment; the centralized unified management of the cutting fluid in a production workshop is facilitated; the service life of the cutting fluid is prolonged, and the production cost is reduced. Therefore, it is very important to develop an apparatus and a method for testing reliability of a cutting fluid to cutting fluid centralized filtering system to ensure stable processing quality and improve production efficiency.

Disclosure of Invention

The invention aims to solve the problem that no device and method can carry out reliability test on a coarse filtering device, an oil-liquid separating device, a fine filtering device and a cutting fluid supplementing device in a cutting fluid centralized filtering system in the prior art, and provides a device and a method for testing the reliability of the cutting fluid centralized filtering system by multi-working-condition simulation loading;

filtration system reliability test device is concentrated to cutting fluid of multiplex condition loading, it includes: the device comprises a working condition simulation system, a cutting fluid centralized filtering system, a state detection/monitoring system and an auxiliary device;

the working condition simulation system comprises: the device comprises a chip loading part, an oil stain loading part, a temperature and humidity loading part, a cutting heat loading part and a cutting fluid backflow part;

the cutting fluid centralized filtering system comprises a cutting fluid filtering part and a cutting fluid supply part;

the state detection/monitoring system comprises a cutting fluid state detection part and an environment monitoring part;

the auxiliary device comprises a ground flat iron (1), a control cabinet 2 and an oil storage tank 3;

the working condition simulation system, the cutting fluid centralized filtering system and the state detection/monitoring system are arranged on a ground flat iron (1) in the auxiliary device, and the ground flat iron (1) is arranged on a foundation; a control cabinet 2 and an oil storage tank 3 in the auxiliary device are arranged on the ground on the right side of the ground flat iron (1); 2. the reliability test device for the cutting fluid centralized filtering system loaded under multiple working conditions according to claim 1, wherein the cutting fluid loading part comprises a chain plate type chip cleaner 8, a chain plate type conveyor 9, a first supporting plate 10, a second supporting plate 11 and a discharge box 12;

at least two groups of chip removers 8, chain plate conveyors 9 and discharge boxes 12 are arranged; the chain plate type conveyor 9 is connected with the discharging box 12 through a bolt hole; the cutting outlet of the first chip cleaner 8 is opposite to the upstream end of the chain plate conveyor 9, the downstream end of the chain plate conveyor 9 is connected with the feed inlet of the discharge box 12, and the discharge outlet below the discharge box 12 corresponds to the cutting chain plate of the next or last chain plate chip cleaner 8; the chain plate type chip cleaner 8 is fixedly arranged on the ground flat iron (1) by the first supporting plate 10, and the chain plate type conveyor 9 is arranged on the ground flat iron (1) by the second supporting plate 11;

the oil stain loading part comprises an oil spraying bracket 13, an electric oil spraying nozzle 14 and an oil conveying pipe 15;

the oil injection bracket 13 is connected with the chain plate type chip cleaner 8 through a bolt; the electric oil nozzle 14 is connected with a mounting plate in the oil injection bracket 13 through threads at the upper end of the electric oil nozzle; an oil outlet of the oil conveying pipe 15 is connected with an oil inlet of an electric oil nozzle 14 in the oil injection support 13, and an oil inlet of the oil conveying pipe 15 is connected with an oil outlet in the oil storage tank 3;

the temperature and humidity loading part comprises a test box 16, a small air conditioner 17 and an industrial humidifier 18;

the small air conditioner 17 is connected with the left end of the test box 16 through a bolt hole, and an air outlet pipeline on the small air conditioner 17 extends into the test box 16 through an air outlet pipeline inlet at the left end of the test box 16; the industrial humidifier 18 is connected with the right end of the test box 16 through a bolt hole, and a humidifying pipeline on the industrial humidifier 18 extends into the test box 16 through a humidifying pipeline inlet at the right end of the test box 16; the test box 16 is connected with the chain plate type chip removal machine 8 through a bolt hole;

the cutting heat loading part comprises a drainage device 19 and an electric heating pipe 20;

the electric heating pipes 20 are connected with the drainage devices 19 through flanges, and each drainage device 19 is connected with 2 electric heating pipes 20; the drainage device 19 is connected with the test box 16 through connecting plates at the left end and the right end;

the cutting fluid backflow part comprises a fluid return water tank 21, a fluid return water tank connecting plate 22, a first fluid return pipeline 23, a fluid return pump set 24 and a second fluid return pipeline 25;

the water inlet of the first liquid return pipeline 23 is connected with the water outlet of the liquid return water tank 21, and the water outlet of the first liquid return pipeline 23 is connected with the water inlet of the liquid return pump unit 24; the water inlet of the second liquid return pipeline 25 is connected with the water outlet of the liquid return pump unit 24; the liquid return water tank 21 and the chain plate type chip removal machine 8 are installed together by a liquid return water tank connecting plate 22; the water outlet of the second liquid return pipeline 25 is aligned with the waste liquid inlet of the coarse filtering device 26;

the cutting fluid state detection part comprises a first oil pollution sensor 4, an oil-water online detector 5, a second oil pollution sensor 6 and a concentration online monitoring probe 7;

the first oil contamination sensor 4 is arranged on the first filtering pipeline 27; the water inlet and the water outlet of the oil-water online detector 5 are respectively connected with 2 stainless steel water pipes in the second filtering pipeline 29; the second oil contamination sensor 6 is arranged on the third filtering pipeline 31; the concentration online monitoring probe 7 is arranged on the first liquid supply pipeline 35;

the environment monitoring part comprises a temperature and humidity sensor 48;

the temperature and humidity sensor 48 is arranged inside the test box 16 and close to the drainage device 19;

the cutting fluid filtering part comprises a coarse filtering device 26, a first filtering pipeline 27, an oil-liquid separating device 28, a second filtering pipeline 29, a fine filtering device 30, a third filtering pipeline 31, a liquid supply water tank 32, a fourth filtering pipeline 33 and a cutting fluid supplementing device 34;

the coarse filtering device 26, the first filtering pipeline 27, the oil-liquid separating device 28, the second filtering pipeline 29, the fine filtering device 30, the third filtering pipeline 31, the liquid supply water tank 32, the fourth filtering pipeline 33 and the cutting liquid supplementing device 34 are sequentially arranged on the ground iron (1);

the cutting fluid supply part comprises a cutting fluid supply main body part and a cutting fluid supply branch part;

the cutting fluid supply main body part is connected with the cutting fluid supply branch part through a fluid supply pipeline 39, a third fluid supply pipeline 40 and a fourth fluid supply pipeline 41;

the cutting fluid liquid supply main body part comprises a first liquid supply pipeline 35, a liquid supply pump set 36, an overflow valve 37, a pressure gauge 38, a second liquid supply pipeline 39, a third liquid supply pipeline 40 and a fourth liquid supply pipeline 41;

the water inlet of the first liquid supply pipeline 35 is connected with the water outlet of the liquid supply water tank 32; the water inlet of the second liquid supply pipeline 39 is connected with the water outlet of the liquid supply pump set 36; the overflow valve 37 and the pressure gauge 38 are arranged on a second liquid supply pipeline 39; the water inlets of the third liquid supply pipeline 40 and the fourth liquid supply pipeline 41 are respectively connected with 2 water outlets of the second liquid supply pipeline 39;

the cutting fluid supply branch part sequentially comprises a switch valve 42, a proportional valve 43, a pressure sensor 44, a flowmeter 45, a cooling universal spray head 46 and a connector 47;

the switch valve 42, the proportional valve 43, the pressure sensor 44 and the flow meter 45 are sequentially installed from top to bottom; the water outlet of the cutting fluid supply branch part is connected with a cooling universal nozzle 46 through a connector 47.

The reliability test method of the cutting fluid centralized filtering system loaded under multiple working conditions comprises the following steps:

step 1: determining the structural composition of a tested cutting fluid centralized filtering system and the specification and model of each tested part to finish the early preparation of a test, and specifically comprising the following steps:

(1) determining the number of the cutting fluid supply branches to be tested and the installation sequence of each tested part;

(2) determining the specifications and models of the coarse filtering device 26, the oil-liquid separating device 28, the fine filtering device 30 and the cutting fluid supplementing device 34;

(3) installing a tested cutting fluid centralized filtering system on a ground flat iron (1) according to requirements;

step 2: the method comprises the following steps of determining the load condition of the cutting fluid in the tested cutting fluid centralized filtering system:

(1) in the chip loading part, firstly, determining the types of chips and the proportion of various types of chips; secondly, determining the adding period of the smaller chips;

(2) in the oil stain loading part, determining the oil flow and the oil spraying period of the electric oil nozzle 14, making a corresponding loading scheme, and controlling a lower programmable logic controller PLC through an upper industrial control unit;

(3) in the temperature and humidity loading part, the temperature and humidity condition inside each test box 16 is determined, and a constant temperature and humidity test or a variable temperature and humidity test is selected; if the temperature and humidity change test is carried out, the change range of the temperature and the humidity and the corresponding test time need to be determined, a corresponding scheme is formulated, and the lower Programmable Logic Controller (PLC) is controlled by the upper industrial control unit;

(4) in the cutting heat loading part, determining the temperature change range of the electric heating pipe 20 and the corresponding test time, making a corresponding loading scheme, and controlling a lower Programmable Logic Controller (PLC) through an upper industrial control unit;

(5) in the cutting fluid supply branch part, firstly determining the number of branches needing to work, secondly determining the flow and pressure of the cutting fluid of each working branch, and selecting a constant flow pressure test or a variable flow pressure test; if the flow rate and pressure are tested, the change ranges of the flow rate and the pressure and the corresponding test time need to be determined, a corresponding loading scheme is formulated, and the lower programmable controller PLC is controlled by the upper industrial controller;

and step 3: and carrying out reliability test according to the specification, and specifically comprising the following steps:

(1) adding a proper amount of cutting fluid into the system, controlling the liquid return pump unit 24 and the liquid supply pump unit 36 to normally work through a lower programmable controller PLC, manually opening a switch valve 42 of a liquid supply branch of the tested cutting fluid, and operating the coarse filtering device 26, the oil-liquid separating device 28, the fine filtering device 30 and the cutting fluid supplementing device 34 according to the specification;

(2) placing the chips in the chip loading part according to the requirements in the step 2, and controlling the normal operation of the chain plate type chip cleaner 8 and the chain plate type conveyor 9 through the lower programmable controller PLC so that the chips repeatedly pass through each branch;

(3) according to the requirements in the step 2, the electric oil nozzle 14 is controlled by the lower programmable logic controller PLC to load oil stains on the system, the small air conditioner 17 and the industrial humidifier 18 are controlled to adjust the temperature and humidity in the test box 16, and the electric heating pipe 20 is controlled to load cutting heat on the system;

(4) according to the requirements in the step 2, the flow and the pressure of the cutting fluid in each branch are adjusted by controlling the proportional valve 43 through the lower programmable controller PLC;

(5) when the reliability test is started, the upper industrial personal computer acquires signals of all the sensors through the data acquisition card;

and 4, step 4: the method for detecting the relevant performance parameters in the cutting fluid centralized filtering system specifically comprises the following steps:

(1) detecting the content of impurities in the cutting fluid flowing through the first filtering pipeline 27 through the first oil pollution sensor 4, and when a signal of the first oil pollution sensor 4 exceeds a normal value, sending an alarm signal to indicate that the state of the coarse filtering device 26 in the tested part is abnormal, stopping the test and forming primary fault information;

(2) detecting the content of oil in the cutting fluid flowing through the second filtering pipeline 29 by the oil-water online detector 5, and when the signal of the oil-water online detector 5 exceeds a normal value, sending an alarm signal to indicate that the state of the oil-water separation device 28 in the tested part is abnormal, stopping the test and forming primary fault information;

(3) detecting the content of impurities in the cutting fluid flowing through the third filtering pipeline 31 by the second oil contamination sensor 6, and when the signal of the second oil contamination sensor 6 exceeds a normal value, sending an alarm signal to indicate that the state of the fine filtering device 30 in the tested part is abnormal, stopping the test and forming primary fault information;

(4) the concentration of the cutting fluid in the fine filtering water tank 32 is detected through the concentration online monitoring probe 7, when the signal of the concentration online monitoring probe 7 exceeds a normal value, an alarm signal is sent out to indicate that the state of the cutting fluid supplementing device 34 in the tested part is abnormal, the test is stopped, and primary fault information is formed;

and 5: processing data, calculating a reliability function, a fault probability function and an average fault interval working time MTBF of the cutting fluid centralized filtering system,

the industrial personal computer calculates and counts the continuous fault interval working time of the cutting fluid centralized filtering system by using a data processing program

Fitting a fault probability density function curve using a two parameter Weibull distribution

Performing parameter estimation by a least square method, and detecting Weibull distribution by using a D detection method so as to determine the distribution rule of the working time of the fault interval;

using the formula:

calculating the reliability function of the cutting fluid centralized filtering system

In the formula:

in order to be a function of the degree of reliability,

is a fault probability density function curve;

using the formula:

calculating the cumulative failure probability function of the cutting fluid centralized filtering system

In the formula:

in order to accumulate the function of the probability of failure,

is a reliability function;

using the formula:

calculating the probability of failure

In the formula:

in order to be a function of the probability of failure,

to accumulate the derivative of the fault probability function,

in order to accumulate the function of the probability of failure,

is the derivative of the reliability function and,

in order to be a function of the degree of reliability,

is a fault probability density function curve;

using the formula:

calculating Mean Time Between Failure (MTBF), wherein:

is a fault probability density function;

the probability distribution function for the two-parameter weibull distribution is:

the probability density function of the two-parameter weibull distribution is:

in the formula:

in order to be a scale parameter,

is a shape parameter;

and D, a detection method: arranging the n data from small to large,

for the purpose of the assumed distribution function,

for empirical distribution function, test statistics are

And a threshold value

The comparison was made as follows. If yes, accepting the original hypothesis, otherwise rejecting the original hypothesis:

in the formula:

compared with the prior art, the invention has the beneficial effects that:

1. the reliability test device and the method for the cutting fluid centralized filtering system with multi-working-condition simulation loading can be used for carrying out reliability tests on the cutting fluid centralized filtering system of 1 or more numerical control machines according to actual working conditions, and the reliability test device utilizes the working condition simulation system to simulate and load various actual loads including cutting, oil contamination, temperature and humidity, cutting heat and the like. Meanwhile, the flow and pressure of the cutting fluid in each branch, the ambient temperature and humidity and the like can be adjusted according to actual working conditions, so that the flexibility of the device is fully embodied;

2. the reliability test device and the method for the cutting fluid centralized filtering system with multi-working-condition simulation loading can set the number of the branches according to actual conditions, so that the number of the branches is multiple of the number of the machine tools in typical working conditions, the test period can be reduced to a certain extent, and the effect of accelerating the test is achieved;

3. the reliability test device and the reliability test method for the cutting fluid centralized filtering system with multi-working-condition simulation loading have the advantages that the chip loading part can ensure that chips can be repeatedly used; with the progress of the test, smaller cuttings are washed away, larger cuttings are reserved, the sizes of the cuttings washed away by each branch can be ensured to be consistent with the typical working condition only by regularly adding the smaller cuttings into the cuttings circular loading system, the problem of overhigh test cost is solved to a certain extent, and test resources are reasonably utilized;

4. the reliability test device and method for the cutting fluid centralized filtering system with multi-working-condition simulation loading can simulate the actual working conditions of the tested part in the cutting fluid centralized filtering system, namely: loading the coarse filtering device and the fine filtering device by using a chip loading part, loading the oil-liquid separating device by using an oil stain loading part, and loading the cutting liquid supplementing device by using a temperature and humidity loading part and a cutting heat loading part;

5. the reliability test device and the method for the cutting fluid centralized filtering system with multi-working-condition simulation loading can select a coarse filtering device, an oil-water separating device and a fine filtering device with any specification and model; the fault position is determined according to the signals fed back by the sensors in the state detection/monitoring system, and the specific fault device is checked according to the position, so that the universality of the device is fully embodied;

the invention discloses a reliability test method of a cutting fluid centralized filtering system loaded under multiple working conditions, which comprises the following test steps of: step 1: determining the structural composition of the tested cutting fluid centralized filtering system and the specification and model of each tested part, and completing the early preparation of the test; step 2: determining the load condition of the cutting fluid in the tested cutting fluid centralized filtering system; and step 3: performing a reliability test according to the standard; and 4, step 4: detecting related performance parameters in the cutting fluid centralized filtering system; and 5: processing data, and calculating a reliability function, a fault probability function and an average fault interval working time MTBF of the cutting fluid centralized filtering system; the test period of the cutting fluid during single-working-condition or multi-working-condition simulation is shortened.

Drawings

The invention is further described with reference to the accompanying drawings in which:

FIG. 1 is an axonometric projection view of the structural components of the reliability testing device of the cutting fluid centralized filtering system with multi-working condition simulation loading of the invention;

FIG. 2 is an axonometric projection view of a working condition simulation system in the reliability test device for the cutting fluid centralized filtration system with multi-working condition simulation loading according to the present invention;

FIG. 3 is an axonometric view of the oil dirt loading part in the reliability testing device of the cutting fluid centralized filtering system with multi-working-condition simulation loading of the invention;

FIG. 4 is an axonometric view of the temperature and humidity loading part in the reliability testing device of the multi-condition simulation loaded cutting fluid centralized filtration system of the invention;

FIG. 5 is an axonometric view of a cutting heat loading part in the reliability test device for the cutting fluid centralized filtering system with multi-working-condition simulation loading according to the present invention;

FIG. 6 is an axonometric projection view of a cutting fluid backflow part in the reliability test device of the cutting fluid centralized filtering system with multi-working-condition simulation loading of the invention;

FIG. 7 is an axonometric view of the cutting fluid filtering part of the reliability testing device of the cutting fluid centralized filtering system with multi-working-condition simulation loading according to the present invention;

FIG. 8 is an axonometric view of a cutting fluid supply part in the reliability test device for a multi-condition simulation loaded cutting fluid centralized filtration system according to the present invention;

FIG. 9 is an axonometric projection view of a cutting fluid supply branch part in the reliability test device for the cutting fluid centralized filtering system with multi-condition simulation loading according to the present invention;

FIG. 10 is a control schematic block diagram of the reliability testing device for the cutting fluid centralized filtering system with multi-working-condition simulation loading according to the present invention;

FIG. 11 is a flow chart of a method for testing the reliability of the centralized cutting fluid filtering system according to the present invention.

Detailed Description

Example 1

The device and the method for the reliability test of the cutting fluid centralized filtering system comprise a working condition simulation system, the cutting fluid centralized filtering system, a state detection/monitoring system and an auxiliary device;

referring to fig. 1, the working condition simulation system, the cutting fluid centralized filtering system and the state detection/monitoring system are installed on a ground leveling iron 1 in the auxiliary device, and the ground leveling iron 1 is installed on a foundation; a control cabinet 2 and an oil storage tank 3 in the auxiliary device are arranged on the ground on the right side of the ground flat iron 1;

in the working condition simulation system, 2 chain plate type chip removers 8 with the same structure are fixedly arranged on the lower side of the ground flat iron 1 through a first supporting plate 10, and the 2 chain plate type chip removers 8 with the same structure are oppositely arranged on the ground flat iron 1 in parallel; 2 chain plate type conveyors 9 with the same structure are arranged on the left side and the right side of the ground flat iron 1 through second supporting plates 11, and the 2 chain plate type conveyors 9 with the same structure are arranged oppositely in parallel along the ground flat iron 1;

a liquid return water tank 21 and the chain plate type chip removal machine 8 are installed together by a liquid return water tank connecting plate 22 in the cutting fluid centralized filtering system; the liquid return pump unit 24 is arranged on the ground flat iron 1 through a connecting plate; the coarse filtering device 26, the oil-liquid separating device 28, the fine filtering device 30, the liquid supply water tank 32 and the cutting liquid supplementing device 34 are sequentially arranged on the ground flat iron 1; the liquid supply pump set 36 is arranged on the ground flat iron 1 through a connecting plate; the second liquid supply pipeline 39, the third liquid supply pipeline 40 and the fourth liquid supply pipeline 41 are all fixed with the laboratory roof through connecting devices; the cooling universal nozzle 46 penetrates through a circular through hole on the upper end face of the test box 16, the water outlet of the cooling universal nozzle is aligned with the electric heating pipe 20, and the connecting head 47 is propped against the upper end face of the test box 16;

in the state detection/monitoring system, the first oil pollution sensor 4 is arranged on a sensor support of the first filtering pipeline 27; the water inlet and the water outlet of the oil-water online detector 5 are respectively connected with 2 stainless steel water pipes in the second filtering pipeline 29; the second oil contamination sensor 6 is arranged on a sensor support of the third filtering pipeline 31; the concentration online monitoring probe 7 is arranged on a sensor support of the first liquid supply pipeline 35; the temperature and humidity sensor 48 is arranged inside the test box 16 and close to the drainage device 19;

working condition simulation system

The working condition simulation system comprises a chip loading part, an oil stain loading part, a temperature and humidity loading part, a cutting heat loading part and a cutting fluid backflow part;

referring to fig. 1 and 2, the chip loading portion includes a chain plate chip remover 8, a chain plate conveyor 9, a first support plate 10, a second support plate 11, and a discharge box 12;

the chain plate type chip removal devices 8 are XS-150 series, and the number of the chain plate type chip removal devices is 2; bolt through holes used for being connected with the first supporting plate 10, the oil injection bracket 13, the test box 16 and the liquid return water tank connecting plate 21 are uniformly processed at the left end and the right end of the chain plate type chip cleaner 8;

the chain plate type conveyor 9 is a KHB-100 series, and the number of the chain plate type conveyor is 2; bolt through holes used for being connected with a second supporting plate 11 and a discharge box 12 are processed at the left end and the right end of the chain plate type conveyor 9;

the first supporting plate 10 and the second supporting plate 11 have the same structure, the lower ends of the first supporting plate and the second supporting plate are respectively provided with a plane supporting foot, the plane supporting feet are welded to form a rectangular plate structural member, the upper end of the upper part of the plate structural member is provided with a bolt hole used for being connected with a chain plate chip cleaner 8 or a chain plate conveyor 9, and the lower part of the rectangular plate structural member is provided with a bolt through hole used for being connected with a T-shaped groove in a ground flat iron (1);

the discharging box 12 is a box-type structural member and is formed by welding 4 rectangular plate-type structural members, bolt through holes for connecting the chain plate conveyor 9 are processed on the rectangular plate-type structural members at the left end and the right end, and the length of the rectangular plate-type structural member at the front end and the upper end is the same as the width of the chain plate conveyor 9;

the 2 chain plate type chip removers 8 with the same structure are connected with the first supporting plate 10 through bolt holes at the left end and the right end; the first supporting plate 10 fixedly installs the chain plate chip removal device 8 at the lower side of the ground flat iron (1) through a bolt hole on the lower part plate structural member, and 2 chain plate chip removal devices 8 with the same structure are installed on the ground flat iron (1) in parallel and oppositely;

the 2 chain plate type conveyors 9 with the same structure are connected with a second supporting plate 11 and a discharge box 12 through bolt holes at the left end and the right end; the second supporting plate 11 parallelly installs 2 chain plate conveyors 9 with the same structure on the left side and the right side of the ground flat iron (1) through bolt holes on the lower part plate structural member, and during installation, one end of the chain plate conveyor 9, which is provided with the discharge box 12, is ensured to be aligned with the feeding end of one chain plate chip cleaner 8, and the end, which is not provided with the discharge box 12, is aligned with the discharge end of the other chain plate chip cleaner 8;

referring to fig. 2 and 3, the oil loading part includes an oil spraying bracket 13, an electric oil spraying nozzle 14 and an oil conveying pipe 15;

the oil injection bracket 13 is a plate-type structural member and is manufactured by adopting a welding process; the oil injection support 13 comprises 2 support plates and 1 mounting plate, wherein the 2 support plates are vertically, parallelly and rightly arranged, the mounting plate is arranged at the top ends of the 2 support plates and connected with the 2 support plates in a welding mode, and the 2 support plates are perpendicular to the mounting plate; bolt through holes used for being connected with the chain plate type chip removal machine 8 are respectively processed on the 2 supporting plates, and bolt through holes used for being connected with the electric oil nozzle 14 are processed on the mounting plate; the number of the oil injection supports 13 is 10;

the electric oil nozzle 14 is D03SF in model number and 20 in number, and the upper end of the electric oil nozzle is provided with threads;

the oil delivery pipe 15 is a flexible rubber pipe and is provided with 2 oil outlets and 1 oil inlet, and the number of the oil outlets and the oil inlet is 10;

the 10 oil injection supports 13 with the same structure are connected and installed with the chain plate type chip removal devices 8 through bolts, and 5 oil injection supports are installed on each chain plate type chip removal device 8; 20 electric oil nozzles 14 with the same structure are connected with a mounting plate in the oil injection bracket 13 through threads at the upper ends of the electric oil nozzles, and 2 electric oil nozzles are connected to each oil injection bracket 13; 2 oil outlets of the oil conveying pipe 15 are connected with oil inlets of 2 electric oil nozzles 14 in the oil injection support 13, and the oil inlet of the oil conveying pipe 15 is connected with an oil outlet in the oil storage tank 3;

the oil injection support 13 is connected with the chain plate type chip removal machine 8 through bolt holes in 2 supporting plates, and 5 oil injection supports 13 are uniformly arranged on each chain plate type chip removal machine 8;

referring to fig. 4, the temperature and humidity loading part includes a test chamber 16, a small air conditioner 17 and an industrial humidifier 18;

the test box 16 is a box type structural part and is manufactured by adopting a welding process, and the number of the test box is 10; the left end of the test box 16 is provided with an air outlet pipeline inlet and a bolt hole for connecting the small air conditioner 17; the right end is provided with a humidifying pipeline inlet and a bolt hole for connecting the industrial humidifier 18; the rear end is provided with a rectangular through hole for installing a glass window; a circular through hole is processed at the upper end, and the diameter of the circular through hole is the same as that of the water outlet of the cooling universal nozzle 46; the lower end is provided with a rectangular through hole and a bolt hole for connecting with a drainage device 19; 2 warm-keeping sliding doors are installed at the front end of the

test box

16, 2 mounting plates are installed on the front side and the rear side of the lower end of the test box, and bolt holes for the chain plate type chip removal machine 8 are machined in the mounting plates;

the small air conditioner 17 is of the type XSAC20, the temperature control range is 0-45 ℃, the number of the small air conditioners is 10, the upper end of the small air conditioner is provided with an air outlet pipeline, the left side and the right side of the small air conditioner are provided with connecting plates, and bolt through holes for connecting the small air conditioner with the test box 16 are processed on the connecting plates;

the industrial humidifier 18 is SL-6E in type, the rated humidification amount is 150ml/h, the number is 10, the upper end is provided with a humidification pipeline, the left side and the right side are provided with connecting plates, and bolt through holes for connecting the test box 16 are processed on the connecting plates;

the small air conditioner 17 is connected with the left end of the test box 16 through bolt holes on mounting plates on two sides, and an air outlet pipeline on the small air conditioner 17 extends into the test box 16 through an air outlet pipeline inlet at the left end of the test box 16; the industrial humidifier 18 is connected with the right end of the test box 16 through bolt holes in mounting plates on two sides, and a humidifying pipeline on the industrial humidifier 18 extends into the test box 16 through a humidifying pipeline inlet at the right end of the test box 16;

the test box 16 is connected with the chain plate type chip removal machines 8 through bolt holes in 2 mounting plates at the lower end, 5 test boxes 16 are uniformly mounted on each chain plate type chip removal machine 8, and the test boxes 16 and the oil injection supports 13 are mounted on the chain plate type chip removal machines 8 in a crossed mode;

referring to fig. 5, the cutting heat loading portion includes a flow guiding device 19 and an electric heating tube 20;

the drainage device 19 is a box-type structural part and is manufactured by adopting a welding process, and the number of the drainage devices is 10; the front end and the rear end of the drainage device 19 are rectangular plate structural members, and bolt through holes for connecting the electric heating pipe 20 are processed on the rear end surface; the 2 rectangular plate structural members at the lower end form a 120-degree angle with the front end and the rear end, and a gap is reserved between the 2 rectangular plate structural members; the left end and the right end are copying plate type structural members; connecting plates are respectively arranged at the left end and the right end of the drainage device 19, the lower end surfaces of the connecting plates are flush with the lower ends of the rectangular plate structural members at the front end and the rear end, and bolt through holes for connecting the connecting plates with the test box 16 are processed on the connecting plates;

the electric heating pipe 20 is internally provided with 20 temperature sensors, the number of the temperature sensors is 20, the pipe diameter is phi 20, the surface of the electric heating pipe can be subjected to heat dissipation and water prevention through special treatment, one end of the electric heating pipe is provided with a flange for connecting the drainage device 19, and a bolt through hole is processed on the flange;

referring to fig. 6, the cutting fluid return portion includes a fluid return tank 21, a fluid return tank connection plate 22, a first fluid return line 23, a fluid return pump set 24, and a second fluid return line 25;

the liquid return water tank 21 is customized according to actual conditions, and the left, right, front, rear and lower ends of the liquid return water tank are rectangular plate structural members; a water outlet used for being connected with a liquid return water tank connecting plate 22 is processed on the front end surface; the number of the liquid return water tanks 21 is 2;

the liquid return water tank connecting plates 22 are rectangular plate type structural members, the number of the liquid return water tank connecting plates is 20, and bolt through holes for connecting the chain plate type chip removal machine 8 and the liquid return water tank 21 are machined in the liquid return water tank connecting plates;

the first liquid return pipeline 23 is formed by welding a plurality of stainless steel water pipes, a plurality of L-shaped stainless steel elbows and a plurality of T-shaped stainless steel elbows; the first liquid return pipeline 23 is provided with 2 water inlets and 2 water outlets, the diameter of each water inlet pipe is the same as that of the water outlet on the front end surface of the liquid return water tank 21, and the diameter of each water outlet pipe is the same as that of the water inlets of the working pump and the standby pump in the liquid return pump group 24;

the liquid return pump unit 24 consists of 1 working pump and 1 standby pump, the working pump and the standby pump are CYZ-A type self-priming pumps, andA motor is matched on the working pump and the standby pump; the working pump and the standby pump are both arranged on a connecting plate, and a bolt through hole for connecting the connecting plate with the ground flat iron (1) is formed in the connecting plate;

the second liquid return pipeline 25 is formed by welding a plurality of stainless steel water pipes, a plurality of L-shaped stainless steel elbows and 1U-shaped reducing tee;

2 water inlets of the first liquid return pipeline 23 are connected with water outlets on the front end surface of the liquid

return water tank

21, and 2 water outlets of the first liquid return pipeline 23 are connected with water inlets of a working pump and a standby pump in the liquid return pump set 24; the water outlet of the U-shaped reducing tee in the second liquid return pipeline 25 is connected with 2 stainless steel water pipes, and the 2 stainless steel water pipes are used as water inlet pipes and are respectively connected with the water outlets of a working pump and a standby pump in the liquid return pump unit 24;

the liquid return water tank connecting plate 22 is used for installing the liquid return water tank 21 and the chain plate type chip removal machines 8 together, 1 liquid return water tank 21 is installed on each chain plate type chip removal machine 8, and the left end face and the right end face of the liquid return water tank 21 and the left end face and the right end face of each chain plate type chip removal machine 8 are ensured to be on the same plane during installation; the liquid return pump unit 24 is arranged on the ground flat iron (1) through a connecting plate; the water outlet of the second liquid return pipeline 25 is aligned with the waste liquid inlet of the coarse filtering device 26 in the cutting liquid filtering part;

cutting fluid centralized filtering system

referring to fig. 7, the cutting fluid filtering part includes a coarse filtering device 26, a first filtering pipeline 27, an oil-liquid separating device 28, a second filtering pipeline 29, a fine filtering device 30, a third filtering pipeline 31, a liquid supply water tank 32, a fourth filtering pipeline 33 and a cutting fluid supplementing device 34;

the coarse filtering device 26 is a tested part and is provided with 1 waste liquid inlet and 1 water outlet; the size and model of the coarse filter device 26 can be selected arbitrarily;

the first filtering pipeline 27 is 1 stainless steel water pipe, and the diameter of the first filtering pipeline is the same as that of a water outlet in the coarse filtering device 26 and a water inlet in the oil-liquid separating device 28; a first filter pipeline 27 is provided with a hole and welded with a sensor support, and the sensor support is provided with internal threads;

the oil-liquid separation device 28 is a tested part and is provided with 1 water inlet and 1 water outlet; the specification and the model of the oil-liquid separation device 28 can be selected at will;

the second filtering pipeline 29 consists of 2 stainless steel water pipes, and the diameter of the second filtering pipeline is the same as that of a water outlet in the oil-liquid separating device 28 and a water inlet in the fine filtering device 30; one end of each of the 2 stainless steel water pipes is respectively provided with an external thread for connecting with the oil-water online detector 5;

the fine filtering device 30 is a tested part and is provided with 1 water inlet and 1 water outlet; the specification and model of the fine filtering device 30 can be selected arbitrarily;

the third filtering pipeline 31 is 1 stainless steel water pipe, and the diameter of the third filtering pipeline is the same as that of the water outlet of the fine filtering device 30 and the water inlet of the liquid supply water tank 32; a third filtering pipeline 31 is provided with a hole and welded with a sensor support, and the sensor support is provided with internal threads;

the liquid supply water tank 32 needs to be processed and customized, has the volume of about 800L, and is provided with 1 cutting fluid water inlet, 1 stock solution supplement water inlet and 1 water outlet;

the fourth filtering pipeline 33 is 1 stainless steel water pipe, the diameter of which is the same as the diameter of the original liquid supplement water inlet in the liquid supply water tank 32 and the water outlet in the cutting liquid supplement device 34;

the cutting fluid supplementing device 34 is a tested part and is provided with 1 water outlet; the specification and model of the cutting fluid supplementing device 34 can be selected at will;

two ends of the first filtering pipeline 27 are respectively connected with the water outlet of the coarse filtering device 26 and the water inlet of the oil-liquid separating device 28; two ends of the second filtering pipeline 29 are respectively connected with the water outlet of the oil-liquid separating device 28 and the water inlet of the fine filtering device 30; two ends of the third filtering pipeline 31 are respectively connected with the water outlet of the fine filtering device 30 and the water inlet of the liquid supply water tank 32; two ends of the fourth filter pipeline 33 are respectively connected with a stock solution supplementing water inlet of the liquid supply water tank 32 and a water outlet of the cutting solution supplementing device 34;

the coarse filtering device 26, the oil-liquid separating device 28, the fine filtering device 30, the liquid supply water tank 32 and the cutting liquid supplementing device 34 are sequentially arranged on the ground iron (1), and a waste liquid inlet of the coarse filtering device 26 is aligned with a water outlet of the second liquid return pipeline 25;

the cutting fluid supply part is divided into a cutting fluid supply main body part and a cutting fluid supply branch part;

referring to fig. 8, the cutting fluid supply main body includes a first fluid supply line 35, a fluid supply pump set 36, an overflow valve 37, a pressure gauge 38, a second fluid supply line 39, a third fluid supply line 40, and a fourth fluid supply line 41;

the first liquid supply pipeline 35 is formed by welding a plurality of stainless steel water pipes, 1T-shaped stainless steel elbow and 1L-shaped stainless steel elbow; the first liquid supply pipeline 35 is provided with 1 water inlet and 2 water outlets, wherein the diameter of the water inlet is the same as that of the water outlet in the liquid supply water tank 32, and the diameters of the water pipes of the 2 water outlets are the same as those of the water inlets of the working pump and the standby pump in the liquid supply pump set 36; a stainless steel water pipe in the first liquid supply pipeline 35, which is close to the water inlet, is provided with a hole and welded with a sensor support, and the sensor support is provided with internal threads;

the liquid supply pump set 36 consists of 1 working pump and 1 standby pump, the working pump and the standby pump are CYZ-A type self-priming pumps, andA motor is matched on the working pump and the standby pump; the working pump and the standby pump are both arranged on a connecting plate, and a bolt through hole for connecting the connecting plate with the ground flat iron (1) is formed in the connecting plate;

the type of the overflow valve 37 is a DBDS2K2X series overflow valve;

the pressure gauge 38 is an YN60 series pressure gauge;

the second liquid supply pipeline 39 is formed by welding a plurality of stainless steel water pipes, 1L-shaped elbow, 1 three-dimensional four-way elbow, 1 three-dimensional three-way elbow and 1U-shaped reducing tee;

the third liquid supply pipeline 40 and the fourth liquid supply pipeline 41 have the same structure and are formed by welding a plurality of stainless steel water pipes, 3T-shaped elbows and 1L-shaped elbow;

the water inlet of the first liquid supply pipeline 35 is connected with the water outlet of the liquid supply water tank 32; the water outlet of the U-shaped reducing tee in the second liquid supply pipeline 39 is connected with 2 stainless steel water pipes, and the 2 stainless steel water pipes are used as water inlet pipes and are respectively connected with the water outlets of the working pump and the standby pump in the liquid supply pump set 36; the overflow valve 37 and the pressure gauge 38 are arranged at the upper end of the U-shaped reducing tee in the second liquid supply pipeline 39; the water inlet ends of the third liquid supply pipeline 40 and the fourth liquid supply pipeline 41 are respectively connected with the three-dimensional four-way elbow and the three-dimensional three-way elbow in the second liquid supply pipeline 39; the third liquid supply pipeline 40 and the fourth liquid supply pipeline 41 are arranged in parallel; the second liquid supply pipeline 39, the third liquid supply pipeline 40 and the fourth liquid supply pipeline 41 are all fixed with the laboratory roof through connecting devices;

the liquid supply pump set 36 is arranged on the ground flat iron (1) through a connecting plate;

referring to fig. 8 and 9, the cutting fluid supply branch part comprises a switch valve 42, a proportional valve 43, a pressure sensor 44, a flow meter 45, a cooling universal nozzle 46 and a connector 47;

the switch valve 42 is a CCGD0F series;

the proportional valve 43 is in YCDF1 series;

the pressure sensor 44 is of KYW20 series and has a digital display function;

the flowmeter 45 is in LWGY series;

the cooling universal nozzle 46 needs to be manufactured and customized, and the water inlet of the cooling universal nozzle is provided with external threads;

the connector 47 needs to be processed and customized, the outer diameter of the connector is larger, one end of the inner diameter is the same as the water outlet of the cutting fluid supply branch part, and the other end of the inner diameter is the same as the water inlet of the cooling universal nozzle 46; the connector 47 is provided with internal threads;

the number of the switching valves 42, the proportional valves 43, the pressure sensors 44, the flow meters 45 and the cooling universal nozzles 46 is 10;

the main body of the cutting fluid supply branch part is 1 stainless steel water pipe, and an external thread is processed at a water outlet at the lower end; the switch valve 42, the proportional valve 43, the pressure sensor 44 and the flow meter 45 are sequentially arranged on the main body of the cutting fluid supply branch part from top to bottom; one end of the connector 47 is connected with a water outlet of the cutting fluid supply branch part, and a water inlet of the cooling universal nozzle 46 is connected with the other end of the connector 47 through threads;

the cutting fluid supplies liquid branch road part's quantity be 10, install 2 on No. two liquid supply pipeline 39 wherein, install 4 respectively in No. three liquid supply pipeline 40 and No. four liquid supply pipeline 41, specific mounting means does: the lower water outlets of the three-dimensional four-way elbow and the three-dimensional three-way elbow in the second liquid supply pipeline 39 are respectively welded with the main body of the cutting liquid supply branch part; the lower water outlets of the T-shaped elbow and the L-shaped elbow in the third liquid supply pipeline 40 and the fourth liquid supply pipeline 41 are respectively welded with the main body of the cutting liquid supply branch part; during installation, the cooling universal nozzle 46 penetrates through the circular through hole on the upper end face of the test box 16, the water outlet of the cooling universal nozzle is aligned with the electric heating pipe 20, and the connector 47 is abutted against the upper end face of the test box 16 to prevent the positions of the third liquid supply pipeline 40 and the fourth liquid supply pipeline 41 from sinking;

state detecting/monitoring system

referring to fig. 1 and 7, the cutting fluid state detection part comprises a first oil contamination sensor 4, an oil-water online detector 5, a second oil contamination sensor 6 and a concentration online monitoring probe 7;

the type of the first oil contamination sensor 4 is OPcome II, and a threaded joint is arranged on the first oil contamination sensor;

the oil-water online detector 5 is KZYU-03 in model, and is provided with 1 water inlet and 1 water outlet, and internal threads are processed on the water inlet and the water outlet;

the second oil contamination sensor 6 is of an OPcom II type and is provided with a threaded joint;

the type of the concentration on-line monitoring probe 7 is CY-QX, and a threaded joint is arranged on the concentration on-line monitoring probe;

the first oil contamination sensor 4 is arranged on a sensor support of the first filtering pipeline 27 through a threaded joint; the water inlet and the water outlet of the oil-water online detector 5 are respectively connected with 2 stainless steel water pipes in the second filtering pipeline 29; the second oil contamination sensor 6 is arranged on a sensor support of the third filtering pipeline 31 through a threaded joint; the concentration online monitoring probe 7 is arranged on a sensor support of the first liquid supply pipeline 35 through a threaded joint;

referring to fig. 9, the environmental monitoring section includes a temperature and humidity sensor 48;

the type of the temperature and humidity sensor 48 is KSW-A1;

auxiliary device

Referring to fig. 1, the auxiliary device includes a ground iron 1, a control cabinet 2 and an oil storage tank 3;

the horizontal iron 1 is a rectangular plate type structural member, and T-shaped grooves which are parallel to each other are longitudinally processed on the horizontal iron;

control cabinet 2 include display, input device, upper industrial computer, AD data acquisition card, next programmable controller PLC and servo driver, wherein:

display model MT185WHM-N20, size 18.5 inches;

the input equipment is a mouse and a keyboard;

the model of the upper industrial personal computer is DA-1000;

the model of the data acquisition card is cDAQ-9189;

the lower programmable controller PLC is a 6ES7D64 series and 64 output points;

the servo driver IS IS620M series;

the oil storage tank 3 needs to be processed and customized, has the volume of 100L and is provided with 10 oil outlets;

the ground flat iron (1) is arranged on a foundation, and the control cabinet 2 and the oil storage tank 3 are arranged on the ground at the lower right side of the ground flat iron (1);

an oil outlet of the oil storage tank 3 is connected with an oil inlet of an electric oil nozzle 14 through an oil conveying pipe 15;

referring to fig. 10, the upper industrial personal computer is connected with the display through a VGA interface, connected with the mouse and the keyboard through a USB interface, communicated with the data acquisition card through a network cable interface, and communicated with the lower programmable controller PLC through an RS484 interface;

a Q01 interface of the lower programmable controller PLC is connected with a CN1 interface of the servo driver, and CN2-CN5 interfaces of the servo driver are respectively connected with electric lines of motors in 2 chain plate

type chip removers

8 and 2 chain plate type conveyors 9; the interface Q02-Q05 is connected with the electric lines of the liquid return pump unit 24 and the liquid supply pump unit 36 through a relay, the interface Q06-Q15 is connected with the electric line of the electric oil nozzle 14, the interface Q16-Q25 is connected with the electric line of the small air conditioner 17 through a relay, the interface Q26-Q35 is connected with the electric line of the industrial humidifier 18 through a relay, the interface Q36-Q45 is connected with the electric line of the electric heating pipe 20 through a relay, and the interface Q46-Q55 is connected with the electric line of the proportional valve 43;

the data acquisition card is an 8-channel data acquisition card and is arranged in a main board clamping groove of an upper industrial personal computer; the acquisition interfaces of the analog quantity signal channels 1-6 of the data acquisition card are sequentially connected with an oil contamination sensor 4, an oil-water online detector 5, an oil contamination sensor 6, a concentration online monitoring probe 7, a temperature and humidity sensor 48 and an electric wire of a temperature sensor in the electric heating pipe 20;

upper industrial computer control interface by VC + + establishment, upper industrial computer communicates with data acquisition card on the one hand, data acquisition card gathers a fluid pollution sensor 4, profit on-line measuring appearance 5, No. two fluid pollution sensor 6, concentration on-line monitoring probe 7, temperature and humidity sensor 48 and the inside temperature sensor's of electric heating pipe 20 signal, and spread into the signal of each sensor in the VC + + procedure, on the other hand upper industrial computer communicates with next programmable controller PLC through the RS484 interface, next programmable controller PLC can accomplish following task:

(1) 2 chain plate

type chip removers

8 and 2 chain plate type conveyors 9 are driven to normally operate through a servo driver, so that chips repeatedly pass through each branch;

(2) according to an oil stain loading scheme, oil stain loading is carried out on the system by controlling the electric oil nozzle 14;

(3) according to the temperature and humidity loading scheme, the temperature and humidity of each branch test environment are adjusted by controlling the small air conditioner 17 and the industrial humidifier 18;

(4) according to the cutting heat loading scheme, the system is subjected to cutting heat loading by controlling the electric heating pipe 20;

(5) the flow and pressure of the cutting fluid are regulated by controlling the proportional valves 43 of the various branches according to the test requirements.

Embodiment 2 reliability test method for cutting fluid centralized filtering system with multi-working-condition simulation loading

Referring to fig. 11, the reliability test method for the cutting fluid centralized filtering system with multi-condition simulation loading provided by the invention is performed on the basis of the reliability device for the cutting fluid centralized filtering system with multi-condition simulation loading, and specifically comprises the following steps:

(1) in the chip loading part, firstly, determining the types of chips (belt-shaped chips, nodular chips, granular chips and broken chips which are input by a manual or automatic feeder) and the proportion of various types of chips; secondly, determining the adding period of the smaller chips;

and 5: processing data and calculating the reliability function of the cutting fluid centralized filtering systemR(t)Fault probability functionλ(t)And average fault interval on-timeMTBFThe method specifically comprises the following steps:

(1) the upper industrial personal computer calculates and counts the continuous fault interval working time of the cutting fluid centralized filtering system by using a data processing programT(i)Fitting a fault probability density function curve using a two parameter Weibull distributionf(t)Performing parameters by least squaresEstimating and testing Weibull distribution by using a D test method so as to determine the distribution rule of the working time of the fault interval;

using the formula:

(2) calculating the reliability function of the cutting fluid centralized filtering systemR(t)In the formula:R(t)in order to be a function of the degree of reliability,f(t)is a fault probability density function curve;

using the formula:

(3) calculating the cumulative failure probability function of the cutting fluid centralized filtering systemF(t)In the formula:F(t)in order to accumulate the function of the probability of failure,R(t)is a reliability function;

using the formula:

(4) calculating the probability of failure

In the formula:

in order to be a function of the probability of failure,

to accumulate the derivative of the fault probability function,

in order to accumulate the function of the probability of failure,

for the derivative of the reliability function,R(t)in order to be a function of the degree of reliability,f(t)to fail probability densityA degree function curve;

using the formula:

calculating mean time between failuresMTBFIn the formula:

is a fault probability density function;

the probability density function of the two-parameter weibull distribution is:

in the formula:

in order to be a scale parameter,

is a shape parameter;

(5) and D, a detection method: arranging the n data from small to large,

for the purpose of the assumed distribution function,

for empirical distribution function, test statistics are

And a threshold value

The comparison was made according to the following formula; if so, accepting the original hypothesisOtherwise, rejecting the original hypothesis:

in the formula:

。

the embodiments of the present invention are described in order to facilitate those skilled in the art to understand and apply the present invention, and the present invention is only an optimized example, or a preferred embodiment; equivalent structural changes or various modifications which do not require inventive work are within the scope of the present invention if those skilled in the art insist on the basic technical solution of the present invention.

Claims

1. Filtration system reliability test device is concentrated to cutting fluid of multiplex condition loading, its characterized in that it includes: the device comprises a working condition simulation system, a cutting fluid centralized filtering system, a state detection/monitoring system and an auxiliary device;

the auxiliary device comprises a ground flat iron (1), a control cabinet (2) and an oil storage tank (3);

the working condition simulation system, the cutting fluid centralized filtering system and the state detection/monitoring system are arranged on a ground flat iron (1) in the auxiliary device, and the ground flat iron (1) is arranged on a foundation; a control cabinet (2) and an oil storage tank (3) in the auxiliary device are arranged on the ground on the right side of the ground flat iron (1).

2. The reliability test device for the cutting fluid centralized filtering system loaded under multiple working conditions according to claim 1, wherein the cutting fluid loading part comprises a chain plate type chip cleaner (8), a chain plate type conveyor (9), a first supporting plate (10), a second supporting plate (11) and a discharge box (12);

the chip cleaner (8), the chain plate type conveyor (9) and the discharge box (12) are provided with at least two groups; the chain plate type conveyor (9) is connected with the discharging box (12) through a bolt hole; the cutting outlet of the first chip cleaner (8) is over against the upstream end of the chain plate conveyor (9), the downstream end of the chain plate conveyor (9) is connected with the feed inlet of the discharge box (12), and the discharge outlet below the discharge box (12) corresponds to the cutting chain plate of the next or last chain plate chip cleaner (8); the chain plate type chip cleaner (8) is fixedly arranged on the ground flat iron (1) by the first supporting plate (10), and the chain plate type conveyor (9) is arranged on the ground flat iron (1) by the second supporting plate (11).

3. The reliability test device for the cutting fluid centralized filtering system loaded under multiple working conditions according to claim 1, wherein the oil contamination loading part comprises an oil injection bracket (13), an electric oil injection nozzle (14) and an oil pipeline (15);

the oil injection support (13) is connected with the chain plate type chip cleaner (8) through a bolt; the electric oil nozzle (14) is connected with a mounting plate in the oil injection bracket (13) through threads at the upper end of the electric oil nozzle; the oil outlet of the oil delivery pipe (15) is connected with the oil inlet of an electric oil nozzle (14) in the oil injection support (13), and the oil inlet of the oil delivery pipe (15) is connected with the oil outlet in the oil storage tank (3).

4. The reliability test device for the cutting fluid centralized filtering system loaded under multiple working conditions according to claim 1, wherein the temperature and humidity loading part comprises a test box (16), a small air conditioner (17) and an industrial humidifier (18);

the small air conditioner (17) is connected with the left end of the test box (16) through a bolt hole, and an air outlet pipeline on the small air conditioner (17) extends into the test box (16) through an air outlet pipeline inlet at the left end of the test box (16); the industrial humidifier (18) is connected with the right end of the test box (16) through a bolt hole, and a humidifying pipeline on the industrial humidifier (18) extends into the test box (16) through a humidifying pipeline inlet at the right end of the test box (16); the test box (16) is connected with the chain plate type chip removal machine (8) through a bolt hole.

5. The reliability test device for the cutting fluid centralized filtering system loaded under multiple working conditions according to claim 1, wherein the cutting heat loading part comprises a drainage device (19) and an electric heating pipe (20);

the electric heating pipes (20) are connected with the drainage devices (19) through flanges, and each drainage device (19) is connected with 2 electric heating pipes (20); the drainage device (19) is connected with the test box (16) through connecting plates at the left end and the right end.

6. The reliability test device for the cutting fluid centralized filtering system loaded under multiple working conditions according to claim 1, wherein the cutting fluid backflow part comprises a fluid return water tank (21), a fluid return water tank connecting plate (22), a first fluid return pipeline (23), a fluid return pump set (24) and a second fluid return pipeline (25);

the water inlet of the first liquid return pipeline (23) is connected with the water outlet of the liquid return water tank (21), and the water outlet of the first liquid return pipeline (23) is connected with the water inlet of the liquid return pump set (24); the water inlet of the second liquid return pipeline (25) is connected with the water outlet of the liquid return pump set (24); the liquid return water tank (21) and the chain plate type chip removal machine (8) are installed together by a liquid return water tank connecting plate (22); the water outlet of the second liquid return pipeline (25) is aligned with the waste liquid inlet of the coarse filtering device (26).

7. The reliability test device for the cutting fluid centralized filtering system loaded under multiple working conditions according to claim 1, wherein the cutting fluid state detection part comprises a first oil pollution sensor (4), an oil-water online detector (5), a second oil pollution sensor (6) and an online concentration monitoring probe (7);

the first oil pollution sensor (4) is arranged on the first filtering pipeline (27); the water inlet and the water outlet of the oil-water online detector (5) are respectively connected with 2 stainless steel water pipes in the second filtering pipeline (29); the second oil liquid pollution sensor (6) is arranged on the third filtering pipeline (31); the concentration online monitoring probe (7) is arranged on the first liquid supply pipeline (35);

the environment monitoring part comprises a temperature and humidity sensor (48);

the temperature and humidity sensor (48) is arranged inside the test box (16) and close to the drainage device (19).

8. The reliability test device for the cutting fluid centralized filtering system loaded under multiple working conditions according to claim 1, wherein the cutting fluid filtering part comprises a coarse filtering device (26), a first filtering pipeline (27), an oil-liquid separating device (28), a second filtering pipeline (29), a fine filtering device (30), a third filtering pipeline (31), a liquid supply water tank (32), a fourth filtering pipeline (33) and a cutting fluid supplementing device (34);

the device comprises a coarse filtering device (26), a first filtering pipeline (27), an oil-liquid separating device (28), a second filtering pipeline (29), a fine filtering device (30), a third filtering pipeline (31), a liquid supply water tank (32), a fourth filtering pipeline (33) and a cutting liquid supplementing device (34) which are sequentially arranged on a horizontal iron (1);

the cutting fluid supply main body part is connected with the cutting fluid supply branch part through a fluid supply pipeline (39), a third fluid supply pipeline (40) and a fourth fluid supply pipeline (41);

the cutting fluid liquid supply main body part comprises a first liquid supply pipeline (35), a liquid supply pump set (36), an overflow valve (37), a pressure gauge (38), a second liquid supply pipeline (39), a third liquid supply pipeline (40) and a fourth liquid supply pipeline (41);

the water inlet of the first liquid supply pipeline (35) is connected with the water outlet of the liquid supply water tank (32); a water inlet in the second liquid supply pipeline (39) is connected with a water outlet in the liquid supply pump set (36); an overflow valve (37) and a pressure gauge (38) are arranged on the second liquid supply pipeline (39); the water inlets of the third liquid supply pipeline (40) and the fourth liquid supply pipeline (41) are respectively connected with 2 water outlets of the second liquid supply pipeline (39);

the cutting fluid supply branch part is sequentially provided with a switch valve (42), a proportional valve (43), a pressure sensor (44), a flowmeter (45), a cooling universal spray head (46) and a connector (47);

the switch valve (42), the proportional valve (43), the pressure sensor (44) and the flowmeter (45) are sequentially arranged from top to bottom; the water outlet of the cutting fluid supply branch part is connected with a cooling universal nozzle (46) through a connector (47).

9. The reliability test method of the cutting fluid centralized filtering system loaded under multiple working conditions is characterized by comprising the following steps of:

step 1: determining the structural composition of the tested cutting fluid centralized filtering system and the specification and model of each tested part, and completing the early preparation of the test;

step 2: determining the load condition of the cutting fluid in the tested cutting fluid centralized filtering system;

and step 3: performing a reliability test according to the standard;

and 4, step 4: detecting related performance parameters in the cutting fluid centralized filtering system;

and 5: and (4) processing data, and calculating a reliability function, a fault probability function and an average fault interval working time MTBF of the cutting fluid centralized filtering system.

10. The method for testing the reliability of the multi-condition loaded cutting fluid centralized filtering system according to claim 9,

the method comprises the following steps of 1, determining the structural composition of a tested cutting fluid centralized filtering system and the specification and model of each tested part, and completing early preparation of a test, and specifically comprises the following steps:

(2) determining the specifications and models of a coarse filtering device (26), an oil-liquid separating device (28), a fine filtering device (30) and a cutting fluid supplementing device (34);

the step 2 of determining the load condition of the cutting fluid in the tested cutting fluid centralized filtering system specifically comprises the following steps:

(2) in the oil stain loading part, determining the oil flow and the oil spraying period of an electric oil nozzle (14), making a corresponding loading scheme, and controlling a lower Programmable Logic Controller (PLC) through an upper industrial control unit;

(3) in the temperature and humidity loading part, the temperature and humidity condition inside each test box (16) is determined, and a constant temperature and humidity test or a variable temperature and humidity test is selected; if the temperature and humidity test is carried out, the change range of the temperature and the humidity and the corresponding test time need to be determined, a corresponding scheme is formulated, and the lower programmable controller PLC is controlled by the upper industrial personal computer;

(4) in the cutting heat loading part, determining the temperature change range of the electric heating pipe (20) and the corresponding test time, making a corresponding loading scheme, and controlling a lower Programmable Logic Controller (PLC) through an upper industrial control unit;

the reliability test according to the specification in the step 3 specifically includes the following steps:

(1) adding a proper amount of cutting fluid into the system, controlling a fluid return pump set (24) and a fluid supply pump set (36) to normally work through a lower Programmable Logic Controller (PLC), manually opening a switch valve (42) of a fluid supply branch of the tested cutting fluid, and operating a coarse filtering device (26), an oil-fluid separating device (28), a fine filtering device (30) and a cutting fluid supplementing device (34) according to specifications;

(2) placing the chips in the chip loading part according to the requirements in the step 2, and controlling the normal operation of a chain plate type chip cleaner (8) and a chain plate type conveyor (9) through a lower programmable controller PLC (programmable logic controller) so that the chips repeatedly pass through each branch;

(3) according to the requirements in the step 2, an electric oil nozzle (14) is controlled by a lower Programmable Logic Controller (PLC) to load oil stains on the system, a small air conditioner (17) and an industrial humidifier (18) are controlled to adjust the temperature and humidity in a test box (16), and an electric heating pipe (20) is controlled to load cutting heat on the system;

(4) according to the requirements in the step 2, the flow and the pressure of the cutting fluid in each branch are adjusted by controlling a proportional valve (43) through a lower Programmable Logic Controller (PLC);

the step 4 of detecting relevant performance parameters in the cutting fluid centralized filtering system specifically comprises the following steps:

(1) detecting the content of impurities in the cutting fluid flowing through the first filtering pipeline (27) through the first oil pollution sensor (4), and sending an alarm signal when a signal of the first oil pollution sensor (4) exceeds a normal value, so that the state of a coarse filtering device (26) in a tested part is abnormal, the test is stopped, and primary fault information is formed;

(2) detecting the content of oil in the cutting fluid flowing through the second filtering pipeline (29) through the oil-water online detector (5), and when the signal of the oil-water online detector (5) exceeds a normal value, sending an alarm signal to indicate that the state of the oil-water separating device (28) in the tested part is abnormal, stopping the test and forming primary fault information;

(3) detecting the content of impurities in the cutting fluid flowing through the third filtering pipeline (31) through the second oil contamination sensor (6), and sending an alarm signal when a signal of the second oil contamination sensor (6) exceeds a normal value, so that the state of the fine filtering device (30) in the tested part is abnormal, the test is stopped, and primary fault information is formed;

(4) the concentration of the cutting fluid in the fine filtering water tank (32) is detected through the concentration online monitoring probe (7), when the signal of the concentration online monitoring probe (7) exceeds a normal value, an alarm signal is sent out to indicate that the state of the cutting fluid supplementing device (34) in the tested part is abnormal, the test is stopped, and primary fault information is formed;

the data processing in step 5 specifically includes the following steps: and calculating a reliability function, a fault probability function and an average fault interval working time MTBF of the cutting fluid centralized filtering system.