CN113267349B - Method for rapidly testing downward sliding amount of forklift gantry - Google Patents
Method for rapidly testing downward sliding amount of forklift gantry Download PDFInfo
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- CN113267349B CN113267349B CN202110572657.5A CN202110572657A CN113267349B CN 113267349 B CN113267349 B CN 113267349B CN 202110572657 A CN202110572657 A CN 202110572657A CN 113267349 B CN113267349 B CN 113267349B
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Abstract
The invention belongs to the technical field of electric forklifts, and particularly relates to a method for rapidly testing the gliding quantity of a forklift gantry, which comprises test verification, determination of the value of the gliding quantity of an intermediate judgment point, revision of the value of the gliding quantity of the intermediate judgment point and periodic spot inspection, finds the value of the gliding quantity of the intermediate judgment point by utilizing normal distribution theory analysis and application, can ensure that the accuracy of the judgment of the gliding quantity of the forklift gantry within 10min of the forklift is over 99.5 percent according to the value judgment of the gliding quantity of the intermediate judgment point within 5min, can improve the accuracy again by utilizing the steps of revising the judgment value and the periodic spot inspection, and further brings about the advantage that the gliding quantity test of the forklift gantry can be shortened from the original 10min to 5min, and the production inspection efficiency is doubled.
Description
Technical Field
The invention belongs to the technical field of electric forklifts, and particularly relates to a method for rapidly testing the downslide quantity of a forklift gantry.
Background
The downward sliding amount of the forklift mast is an important performance index of the forklift, and each forklift in the industry can test the downward sliding amount of the forklift mast before leaving a factory. According to the requirements of JB/T3300-2010 counterweight type whole forklift test method, the test method is that under the condition that the hydraulic oil temperature is guaranteed to be 40-50 ℃, a forklift gantry is in a state of being perpendicular to the ground, an engine stalls after the standard load cargo is lifted to 2500mm, the downward sliding quantity of the forklift cargo within 10min is not more than 100mm, internal control standards of each company for the downward sliding quantity within 10min are different according to different product qualities of each company, the internal control standards of each company are usually less than 100mm, but the test time is not less than 10min, taking the company as an example, the internal control standard of the downward sliding quantity of the forklift gantry is not more than 40mm within 10 min;
however, due to the fact that the forklift yield is large, the glide quantity test is carried out after each forklift is assembled, the 10-min glide quantity test seriously affects the forklift production efficiency, a scientific test method is found, the test time of the forklift mast glide quantity is effectively shortened on the premise that the accuracy is guaranteed, and the forklift production efficiency is further improved.
Disclosure of Invention
Aiming at the existing situation, the invention relates to a method for rapidly testing the downward sliding amount of a forklift mast, which can effectively save the testing time of the downward sliding amount of the forklift mast, and the specific technical scheme is as follows:
a method for rapidly testing the downward sliding amount of a forklift mast comprises the following steps:
step 1: the test is carried out to verify that,
performing a glide quantity test for more than 10min by spot check on more than 20 forklift gantries to obtain that the relationship curves of the glide quantity of the forklift gantries and time are parabolas with upward openings, and the inflection points of the parabolas are all 10min later; therefore, the sliding amount of the forklift gantry is gradually reduced within 10 min;
step 2: the value of the intermediate decision point downslide amount is determined,
performing spot check on the numerical values of the gliding quantity of more than 20 forklift gantries for 2min, 5min, 8min and 10min to calculate and record a parallel table, adopting 5min as a middle judgment point and obtaining the gliding quantity by using a normal distribution analysis method, wherein when the gliding quantity of the forklift gantry for 5min is less than or equal to a, the probability that the gliding quantity of the forklift gantry for 10min is less than or equal to b is more than 99 percent, so that a is the gliding quantity value of the middle judgment point, wherein b is a specified standard value, and b is less than 100 mm;
and step 3: for the value revision of the intermediate decision point roll-off amount,
1) determining an initial value a, namely a 5min gliding quantity passing value a of the forklift gantry;
2) if the sliding amount of the forklift gantry is less than or equal to a within 5min, the forklift gantry passes through the sliding groove;
if the downslide amount of the forklift gantry is larger than a in 5min, prolonging the downslide amount test time of the forklift gantry to 10min, respectively recording the downslide amount numerical values of the forklift gantry in 5min and the forklift gantry in 10min, and judging whether the downslide amount of the forklift gantry in 10min reaches the standard or not according to b;
3) when the number of the forklift gantries with the 5min forklift gantry gliding amount > a is X, the number of the forklift gantries with the 10min forklift gantry gliding amount less than or equal to b is M, namely the number of the forklift gantries passing the 10min gliding amount test, and the number of the forklift gantries with the 10min forklift gantry gliding amount > b is N, namely the number of the forklift gantries failing the 10min gliding amount test is N, and X = M + N;
4) when the N/X is less than or equal to 5 percent, adjusting the slip amount passing value at 5min to a +1mm, clearing the value of X, and performing the accumulated calculation again according to 3), wherein a +1 is less than or equal to 23mm, and X is more than or equal to 100;
5) when the N/X is more than or equal to 20 percent, adjusting the slip amount passing value at 5min to a-1mm, resetting the value of X, and performing accumulated calculation again according to 3), wherein a-1mm is more than or equal to 18mm, and X is more than or equal to 100;
and 4, step 4: the sampling inspection is carried out at regular intervals,
regularly carry out spot check to the 5min gliding volumes of fork truck portal, the 10min gliding volumes of different specification models, look over whether accord with the internal control standard of fork truck portal gliding volumes, screen and look over its angle condition of passing through simultaneously.
The invention has the following beneficial technical effects:
the method for rapidly testing the downward sliding amount of the forklift mast provided by the invention utilizes normal distribution theory analysis and application to find the value of the downward sliding amount of the intermediate decision point, and can ensure that the accuracy of the judgment of the downward sliding amount of the forklift mast for 10min of the forklift is over 99.5% according to the judgment of the value of the downward sliding amount of the intermediate decision point for 5min, and simultaneously, the accuracy can be improved by utilizing the steps of revising the decision value and a regular spot inspection mode, so that the yield is increased by one time because the downward sliding amount test of the forklift mast can be shortened to 5min from the original 10min, and the production inspection efficiency is improved by one time.
Drawings
Fig. 1 is a diagram illustrating a result of a measurement of the downward sliding amount of the forklift mast within 15min according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Examples
Through the analysis of the reason for the downward sliding of the forklift mast, which is usually caused by the leakage of the valve core of the multi-way valve, according to the empirical formula of the leakage amount of the valve body: q = pi dh3x Δ P/12 μ l, wherein Q-leakage amount ml/s; d-valve core diameter cm; h-gap height cm; Δ P-the pressure difference Pa across the gap; μ -hydrodynamic viscosity Pa S of the oil; 1-gap length;
according to the formula, the influence factors of the valve body leakage amount are constant values except that the dynamic oil viscosity changes along with the oil temperature, and as the downward sliding amount test of the forklift mast is carried out under the engine flameout state, the oil temperature theoretically can be gradually reduced along with the time, the dynamic oil viscosity increases along with the time, the downward sliding speed of the forklift mast gradually slows down along with the time,
therefore, whether the 10min gliding amount of the forklift mast reaches the enterprise internal control standard or not can be evaluated by testing the gliding amount of the forklift mast less than 10 min. Taking our company as an example, the internal control standard of the downward sliding amount of the forklift mast is that the downward sliding amount of the forklift mast is not more than 40mm within 10 min.
A method for rapidly testing the downward sliding amount of a forklift mast comprises the following steps:
step 1: the test is carried out to verify that,
performing a glide quantity test for more than 10min by spot check on more than 20 forklift gantries to obtain that the relationship curves of the glide quantity of the forklift gantries and time are parabolas with upward openings, and the inflection points of the parabolas are all 10min later; therefore, the sliding amount of the forklift gantry is gradually reduced within 10 min; fig. 1 is a test result chart of the sliding-down amount of one of the forklift gantries within 15min, and other test result charts are similar.
Step 2: the value of the intermediate decision point downslide amount is determined,
the glide quantity values of more than 20 forklift frames in 2min, 5min, 8min and 10min are spot-checked and calculated, see table 1,
the glide quantity of each forklift portal within 5min and the probability of passing the internal control standard for 40mm within 10min are calculated by normal distribution and are shown in table 2,
according to the data, under the condition that the glide quantity is not more than 18mm in 5min, the probability of not more than 40mm in 10min is more than 99%. Therefore, when the downward sliding quantity of the forklift gantry is tested, the downward sliding quantity testing time of 5-10 min can be saved as long as the downward sliding quantity is not more than 18mm within 5min, and the downward sliding quantity testing time can be prolonged to 10min by the forklift with the downward sliding quantity of 5min being more than 18mm in order to guarantee the product quality.
And step 3: for the value revision of the intermediate decision point roll-off amount,
1) determining that the initial value is 18mm, namely the 5min gliding quantity passing value of the forklift gantry is 18 mm;
2) if the sliding quantity of the forklift gantry is less than or equal to 18mm in 5min, the forklift gantry passes through the sliding device;
if the downslide amount of the 5min forklift mast is larger than 18mm, prolonging the downslide amount test time of the forklift mast to 10min, respectively filling downslide amount values of the 5min forklift mast and the 10min forklift mast, and judging whether the downslide amount of the 10min forklift mast reaches the standard or not according to 40 mm;
3) when the number of forklift gantries with the 5min forklift mast gliding amount larger than 18mm is X, the number of forklift gantries with the 10min forklift mast gliding amount smaller than or equal to 40mm is M, namely the number of forklift gantries passing the 10min gliding amount test, the number of forklift gantries with the 10min forklift mast gliding amount larger than 40mm is N, namely the number of forklift gantries failing the 10min gliding amount test is N, and X = M + N;
4) when the N/X is less than or equal to 5 percent, adjusting the 5min gliding amount to be 18mm +1mm through the value, clearing the value of X, and performing accumulated calculation again according to 3), wherein the 5min gliding amount is adjusted to be 23mm at the maximum through the value, and X = 100;
when the N/X is larger than or equal to 20%, adjusting the 5min slip-off passing value to be 18mm-1mm, clearing the X value, and performing accumulated calculation again according to 3), wherein the 5min slip-off passing value is adjusted to be 17mm at the minimum, and X = 100.
And 4, step 4: the sampling inspection is carried out at regular intervals,
periodically performing spot check on the 5min and 10min sliding quantities of the forklift gantries of different specifications and models, and checking whether the sliding quantities meet the requirement that whether the sliding quantities of the forklift gantries are not more than 40mm within 10 min; and simultaneously, screening and checking the angle passing condition of the mobile terminal.
Therefore, the method can effectively save the time for testing the downward sliding quantity of the forklift gantry and effectively ensure the accuracy of measurement.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (1)
1. A method for rapidly testing the downward sliding amount of a forklift gantry is characterized by comprising the following steps:
step 1: the test is carried out to verify that,
performing a glide quantity test for more than 10min by spot check on more than 20 forklift gantries to obtain that the relationship curves of the glide quantity of the forklift gantries and time are parabolas with upward openings, and the inflection points of the parabolas are all 10min later; therefore, the sliding amount of the forklift gantry is gradually reduced within 10 min;
step 2: the value of the intermediate decision point downslide amount is determined,
performing spot check on the numerical values of the gliding quantity of more than 20 forklift gantries for 2min, 5min, 8min and 10min to calculate and record a parallel table, adopting 5min as a middle judgment point and obtaining the gliding quantity by using a normal distribution analysis method, wherein when the gliding quantity of the forklift gantry for 5min is less than or equal to a, the probability that the gliding quantity of the forklift gantry for 10min is less than or equal to b is more than 99 percent, so that a is the gliding quantity value of the middle judgment point, wherein b is a specified standard value, and b is less than 100 mm;
and step 3: for the value revision of the intermediate decision point roll-off amount,
determining an initial value a, namely a 5min gliding quantity passing value a of the forklift gantry;
if the sliding amount of the forklift gantry is less than or equal to a within 5min, the forklift gantry passes through the sliding groove;
if the downslide amount of the forklift gantry is larger than a in 5min, prolonging the downslide amount test time of the forklift gantry to 10min, respectively recording the downslide amount numerical values of the forklift gantry in 5min and the forklift gantry in 10min, and judging whether the downslide amount of the forklift gantry in 10min reaches the standard or not according to b;
when the number of the forklift gantries with the 5min forklift gantry gliding amount > a is X, the number of the forklift gantries with the 10min forklift gantry gliding amount less than or equal to b is M, namely the number of the forklift gantries passing the 10min gliding amount test, and the number of the forklift gantries with the 10min forklift gantry gliding amount > b is N, namely the number of the forklift gantries failing the 10min gliding amount test is N, and X = M + N;
when the N/X is less than or equal to 5 percent, adjusting the 5min slip-off quantity passing value to be a +1mm, clearing the X value, and performing accumulated calculation again according to 3), wherein the 5min slip-off quantity passing value is adjusted to be 23mm at maximum, and X is more than or equal to 100;
when the N/X is more than or equal to 20 percent, adjusting the 5min slip-off quantity passing value to a-1mm, resetting the X value, and carrying out accumulated calculation again according to 3), wherein the 5min slip-off quantity passing value is adjusted to 17mm at the minimum, and X is more than or equal to 100;
and 4, step 4: the sampling inspection is carried out at regular intervals,
regularly carry out spot check to the 5min gliding volumes of fork truck portal, the 10min gliding volumes of different specification models, look over whether accord with the internal control standard of fork truck portal gliding volumes, screen and look over its angle condition of passing through simultaneously.
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