Patent ID: 12228465

Icon:20—impact indicator sensor,30—signal adapter,40—host computer,1—oil tank,2—first flange,3—sealing ring,4—impact sensing sheet,5—bolt,6—protection case,7—adapter head,8—sensing controller,11—standard weight holder,12—standard weight,13—dynamic standard hammer.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, but not to limit the present disclosure.

Embodiment 1

A method for traceability calibration of a calibration device of a rock chiseling specific power tester includes static calibration and dynamic calibration. The static calibration includes the following steps: S1: an impact indicator sensor20of the calibration device is placed on a static calibration stage, the calibration device is reset to enter a static calibration mode, and a static calibration coefficient k and dynamic calibration coefficients a, b are reset; S2: a standard weight holder11is installed on an adapter head7of the impact indicator sensor20, and an indication value f1of the impact indicator sensor20and a total mass of weights m1are recorded; S3: a standard weight12is added to the standard weight holder11several times, and each time the standard weight12is added, indication values f2, f3, . . . , fnof the impact indicator sensor20and the total mass of the weights m2, m3, . . . , mnare recorded; and S4: a static coefficient k is calculated, and the calculated static coefficient is set as a value of the static calibration coefficient k. The dynamic calibration includes the following steps: K1: the impact indicator sensor20of the calibration device is placed on a dynamic calibration stage, and a dynamic standard hammer13on the dynamic calibration stage is adjusted to match the adapter head7of the impact indicator sensor20when the dynamic standard hammer13falls down; K2: a dynamic calibration coefficient a and a dynamic calibration coefficient b of the calibration device are reset to enter a dynamic calibration mode, and the dynamic standard hammer13on the dynamic calibration stage is started to impact the impact indicator sensor20; K3: a standard impact energy W0of the dynamic standard hammer13and a measured indication value W of the impact indicator sensor20are recorded to obtain a standard deviation S=W−W0; and K4: the standard impact energy of the dynamic standard hammer13and the measured indication value W of the impact indicator sensor20are measured for several times, to obtain the standard deviation Si(i=1, 2, 3, . . . , n), the standard deviation Siis split by a univariate linear regression method to set Si=a+bW, and a dynamic coefficient a and a dynamic coefficient b are calculated by the univariate linear regression method, and the calculated dynamic coefficients are set as values of the dynamic calibration coefficients a and b.

In the step S4, f1and m1are used to calculate

k1=m1⁢gf1,
f2and m2are used to calculate

k2=m2⁢gf2,
. . . , and fnand mnare used to calculate

kn=mn⁢gfn,
and then the static coefficient k is calculated by

k=∑i=1nkin,
wherein g is a gravitational acceleration, and fiis a static measured indication value of the impact indicator sensor20during an ithmeasurement, i=1, 2, 3, . . . , n.

During an nthimpact, the indication value fnof the impact indicator sensor20is greater than 80% of a measuring range of the impact indicator sensor20.

A calculation formula of the dynamic calibration coefficient a is

a=∑i=1nWi⁢∑i=1n(Wi⁢❘"\[LeftBracketingBar]"Wi-W0⁢i❘"\[RightBracketingBar]")-∑i=1nWi2⁢∑i=1n❘"\[LeftBracketingBar]"Wi-W0⁢i❘"\[RightBracketingBar]"(∑i=1nDi)2-n⁢∑i=1nDi2,
and a calculation formula of the dynamic calibration coefficient b is

b=∑i=1nWi⁢∑i=1n❘"\[LeftBracketingBar]"Wi-W0⁢i❘"\[RightBracketingBar]"-n⁢∑i=1nWi⁢❘"\[LeftBracketingBar]"Wi-W0⁢i❘"\[RightBracketingBar]"(∑i=1nWi)2-n⁢∑i=1nWi2,
wherein W0iis the standard impact energy of the dynamic standard hammer13during the ithmeasurement, and Wiis a dynamic measured indication value of the impact indicator sensor20during the ithmeasurement, i=1, 2, 3, . . . , n.

The calculated k, a, b are important coefficients for the calibration device to calculate the measurement results. The specific operation steps of the calibration device of the rock chiseling specific power tester are as follows:

The pressure data obtained by the calibration device of the rock chiseling specific power tester is calculated as an indication data. The calculation includes the following steps: A1: through an Analog-to-Digital Converter (ADC) circuit, analog-to-digital conversion is performed on a pressure analog signal detected by a pressure sensitive sensing sheet to obtain continuous magnitude data f(t) of the pressure value, where t is time of the impact force action; A2: adaptive filtering is performed on the obtained continuous magnitude data to obtain stable data fa(t), where the filtering formula is:

ft=ft-1×(n-1)n+ftn,
and n is a width of a filter queue; A3: static force calibration is performed on fa(t) to obtain fb(t), i.e., fb(t)=k·(fa(t)−fa(0)), where k is the static calibration coefficient calibrated by a upper-level traceability device, and fa(0) is a measured value of fa(t) when a null point of the indication measurement is established; A4: during the time of the impact force action, an impact energy w is obtained by integrating fb(t), i.e., w=∫fb(t)dt; A5: an impact indicator W is obtained by performing dynamic calibration on the impact energy w, i.e., W=a+bw, where a and b are the dynamic calibration coefficients calibrated by the upper-level traceability device; A6: the impact indicator W is transmitted as an impact indicator magnitude to a host computer40.

A central axis is vertically arranged on the standard weight holder11. When each standard weight12is added, each standard weight12sleeves the central axis.

As shown inFIG.6, the rock chiseling specific power tester can be traced to equal mass standard of standard weights by the above method.

The present disclosure provides a traceability method based on a novel calibration device of a rock chiseling specific power tester, which constructs a traceability link from a rock to be tested to the rock chiseling specific power tester, to the calibration device of the rock chiseling specific power tester, to the standard weight holder, the standard weight and the dynamic standard hammer, and especially formulates a traceability method from the novel calibration device of the rock chiseling specific power tester to the standard weight holder, the standard weight and the dynamic standard hammer. The rock chiseling specific power magnitude can be effectively traced to equal mass standard of standard weights, and a new traceability method and system for rock chiseling specific power magnitude is constructed.

Embodiment 2

The calibration device of the rock chiseling specific power tester provided by the embodiment 1 includes an impact indicator sensor20, a signal adapter30and a host computer40. An end of the signal adapter30is connected to the impact indicator sensor20by a first USB cable, and the other end of the signal adapter30is connected to the host computer40by a second USB cable.

The impact indicator sensor20includes an oil tank1, an impact sensing sheet4and an adapter head7. An oil sink with an upward opening is arranged on the upper side of the oil tank1, and hydraulic oil is in the oil sink. The impact sensing sheet4is hermetically connected to the upper side of the oil tank1for sealing the opening of the oil sink. The adapter head7is connected to the upper side of the impact sensing sheet4. A mounting hole is arranged on a side of the oil tank1, and communicates with the oil sink. A sensing controller8is installed in the mounting hole. The sensing controller8is connected to the signal adapter30by the first USB cable. A pressure sensitive sensing sheet and an MCU control system are arranged in the sensing controller8. When the adapter head7is under pressure, such device transmits the pressure to the impact sensing sheet4, and thus the impact sensing sheet4is under pressure to squeeze the hydraulic oil in the oil sink such that the pressure sensitive sensing sheet in the sensing controller8can sense information on hydraulic oil pressure changes. This information is transmitted to the MCU control system so that an operator can obtain the pressure data by the MCU control system.

A first flange2is arranged around the oil sink on the upper side of the oil tank1. A second flange is arranged on an edge of the impact sensing sheet4. The first flange2is connected to the second flange by a bolt5, and a sealing ring3is arranged between the first flange2and the second flange. The oil tank1can be stably connected to the impact sensing sheet4by arranging the first flange2, the second flange and the bolt5. A gap between the first flange2and the second flange can be well sealed by arranging the sealing ring3, so that the hydraulic oil in the oil tank1can be well sealed in the oil sink.

A wavy metal film is arranged as the middle portion of the impact sensing sheet4. When a top surface of the metal film is impacted, the metal film is deformed towards the interior of the oil sink, so as to change the volume of the oil sink, so that internal pressure of the hydraulic oil is changed, and the pressure sensitive sensing sheet can sense these pressure changes, which will be transmitted to the MCU control system. A piston or other structure can also be arranged as the middle portion of the impact sensing sheet4, provided that an external force can be converted into a force towards the interior of the oil sink, and further the hydraulic oil pressure can be changed.

The calibration device also includes a protection case6. The outer wall of the protection case6is connected to the inner wall of the second flange, the inner wall of the protection case6is connected to the outer wall of the adapter head7, and the lower side of the adapter head7is fitted with the upper side of the wavy metal film. The protection case6is used for uniforming an impact surface, and the outer wall of the protection case6is fitted with the inner wall of the second flange, and the inner wall of the protection case6is fitted with the outer wall of the adapter head7, which can play a guiding role and ensure that when the adapter head7is impacted, the impact force can be correctly transmitted to the metal film of the impact sensing sheet4by the adapter head.

A groove for adapting a drill bit of the specific power tester is arranged on the upper side of the adapter head7. The transmission efficiency of impulse can be ensured when the drill bit impacts, by arranging the groove for adapting a drill bit of the specific power tester. Simultaneously, the adapter head7has sufficient rigidity to prevent energy absorption caused by deformation.

The MCU control system converts an analog signal of the pressure sensitive sensing sheet into a digital signal and uploads the digital signal. The pressure sensitive sensing sheet is used for detecting the pressure of the hydraulic oil in the oil tank1in real time. The MCU control system converts the analog signal of the pressure sensitive sensing sheet into the digital signal, and calibrates thereof by the stored calibration procedure and the dynamic and static calibration coefficients, and then the calibrated data is uploaded to the host computer40by the signal adapter30.

Although the present disclosure has been described herein with reference to a plurality of illustrative embodiments thereof, it should be understood that numerous other modifications and implementations can be devised by those skilled in the art that will fall within the principle scope and spirit of this disclosure. More particularly, various variations and modifications are possible in the components and/or arrangements of the subject combination arrangement within the scope of the present disclosure, drawings and claims. In addition to variations and modifications to the components and/or arrangements, other purposes will also be apparent to those skilled in the art.