CN112964546A - Operation method of high-low temperature environment device for mechanical property test of concrete test block - Google Patents
Operation method of high-low temperature environment device for mechanical property test of concrete test block Download PDFInfo
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- CN112964546A CN112964546A CN202110411474.5A CN202110411474A CN112964546A CN 112964546 A CN112964546 A CN 112964546A CN 202110411474 A CN202110411474 A CN 202110411474A CN 112964546 A CN112964546 A CN 112964546A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
A funnel collecting box is vertically arranged and is used for containing tested concrete test blocks; the high-low temperature environment box is horizontally arranged, an upper pressing block and a lower pressing block which penetrate through the high-low temperature environment box are arranged on the upper side and the lower side of the front end of the high-low temperature environment box, the top of the upper pressing block is connected to the loading testing machine, and the bottom of the lower pressing block is arranged on the ground; the high and low temperature environment device further comprises a movable feeding system, the movable feeding system comprises a test block base plate and a push rod, wherein the transverse test block base plate is arranged on the bottom side of the inside of the high and low temperature environment box, the push rod is arranged at the tail of the test block base plate, and penetrates through the right side of the high and low temperature environment box to stretch out, and the push rod can freely move left and right. The invention can replace the concrete test block by the movable push rod, and complete the test of a plurality of concrete test blocks in a constant temperature environment, thereby improving the test precision, greatly improving the test efficiency and saving resources.
Description
Technical Field
The invention relates to the field of mechanical property tests for measuring concrete test blocks and members, in particular to an operation method of a high-low temperature environment device for testing the mechanical property of a concrete test block at the temperature of between 170 ℃ below zero and 100 ℃.
Background
The ultra-low temperature storage tank is a special structure which is built in China in recent years. The outer tank wall of the storage tank is generally of a prestressed concrete structure, the storage temperature of liquefied natural gas is about-165 ℃, when the inner tank leaks, the outer tank can bear tensile load and-165 ℃ temperature load, and the performance of the steel bars at low temperature can be changed, so that the overall performance of the reinforced concrete is influenced. In addition, the reinforced concrete structure in severe cold areas, the base construction of polar exploration and the like are all in low-temperature environments, and high requirements are provided for the performance of the reinforced concrete structure. The performance of the concrete applied to low-temperature storage of Liquefied Natural Gas (LNG) is greatly different from that of the concrete at normal temperature in the ultralow-temperature environment.
Most of the existing low-temperature or ultralow-temperature concrete axle center compressive strength testing devices do not have a heat preservation facility, the concrete test blocks cannot keep constant temperature, the efficiency is low when a large number of tests are carried out, tests of a plurality of concrete test blocks cannot be carried out under the same test conditions, repeated tests need to be carried out on the plurality of concrete test blocks 10 for many times, the accuracy of the test conditions cannot be guaranteed, and resource waste can be caused.
Disclosure of Invention
In order to solve the problems that the block cannot keep constant temperature when the concrete compressive strength test is carried out in a low-temperature environment, the temperature loss is generated when the concrete block 10 is replaced and the like, the invention provides an operation method of a high-low temperature environment device for the concrete block mechanical property test.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an operation method of a high-low temperature environment device for a concrete test block mechanical property test comprises the following steps:
before the test, the connecting piece 4 of the high-low temperature environment box and the funnel collecting box 6 is opened, the concrete test blocks 10 and the spacer blocks 8 are sequentially placed on the test block base plate 9 from inside to outside until the last concrete test block 10 is positioned between the upper pressing block 3 and the lower pressing block 7. Then connect high low temperature environment case and funnel collecting box 6 through connecting piece 4 and be the integral type structure, inspect load test machine 2, refrigerating system, heating system and measurement and control system, prepare the experiment, the experiment includes high temperature test or/and low temperature test.
During a low-temperature test, (1) power supplies of all devices are turned on, a temperature preset value input unit is used for setting the temperature X of the high-low temperature environment box, for example, X is-170 ℃, a temperature sensor 17 monitors the temperature of the concrete test block 10 in real time, and when the temperature of the high-low temperature environment box does not reach-170 ℃, an external liquid nitrogen source control switch of a measurement and control system is used for controlling the input amount of an external liquid nitrogen source to be increased, so that the temperature of the high-low temperature environment box reaches-170 ℃; then an external liquid nitrogen source control switch of the measurement and control system is used for controlling the input of the external liquid nitrogen source to be reduced until the temperature of the high-low temperature environment box reaches-170 ℃ and keeps basically constant for 48 hours; and after 48h, the external liquid nitrogen source control switch is used for controlling the input of the external liquid nitrogen source to be continuously reduced so as to maintain the temperature to be unchanged in the pressure test process. (2) The control switch of the loading tester is used for controlling the working state of the loading tester 2, the loading tester 2 starts to work, the compression strength of the axis of the concrete is measured by the loading tester 2, the upper pressing block 3 moves downwards, the first concrete test block 10 is subjected to a crushing test, and the upper pressing block 3 moves upwards after the first concrete test block 10 fails to be crushed. A push rod moving hydraulic cylinder control switch of the measurement and control system is used for advancing the push rod moving hydraulic cylinder to drive the push rod 11 to push forwards, so that the crushed invalid concrete test block 10 and the test block baffle 13 are pushed forwards into the funnel collection box 6, and the next concrete test block 10 is pushed to a region to be tested; and so on until all the concrete test blocks 10 finish the test; and recording the failure pressure value of each concrete test block 10 during the test, wherein the failure pressure value is the compressive strength of the concrete axle center.
During a high-temperature test, (1) power supplies of all equipment are turned on, a temperature preset value input unit is used for setting the temperature Y of the high-temperature and low-temperature environment box, for example, Y is 100 ℃, a temperature sensor 17 monitors the temperature of the concrete test block 10 in real time, when the temperature of the high-temperature and low-temperature environment box does not reach 100 ℃, an iron-chromium-aluminum resistance wire control switch of a measurement and control system is used for controlling the heating temperature of the iron-chromium-aluminum resistance wire to rise, and a propeller type centrifugal blower control switch is used for controlling the wind power of a propeller type centrifugal blower to increase, so that the temperature of the high-temperature; then an iron chromium aluminum resistance wire control switch of the measurement and control system is used for controlling the reduction of the heating temperature of the iron chromium aluminum resistance wire, and a propeller type centrifugal blower control switch is used for controlling the reduction of the wind power of the propeller type centrifugal blower until the temperature of the high and low temperature environment box reaches 100 ℃ and keeps the temperature basically constant for 48 hours; and after 48h, the iron-chromium-aluminum resistance wire control switch is used for controlling the iron-chromium-aluminum resistance wire to reduce heating, and the propeller type centrifugal blower control switch is used for controlling the wind power of the propeller type centrifugal blower to continuously reduce so as to keep the temperature unchanged in the pressure test process. (2) The control switch of the loading tester is used for controlling the working state of the loading tester 2, the loading tester 2 starts to work, the compression strength of the axis of the concrete is measured by the loading tester 2, the upper pressing block 3 moves downwards, the first concrete test block 10 is subjected to a crushing test, and the upper pressing block 3 moves upwards after the first concrete test block 10 fails to be crushed. A push rod moving hydraulic cylinder control switch of the measurement and control system is used for advancing the push rod moving hydraulic cylinder to drive the push rod 11 to push forwards, so that the crushed invalid concrete test block 10 and the test block baffle 13 are pushed forwards into the funnel collection box 6, and the next concrete test block 10 is pushed to a region to be tested; and so on until all the concrete test blocks 10 finish the test; and recording the failure pressure value of each concrete test block 10 during the test, wherein the failure pressure value is the compressive strength of the concrete axle center.
After the test, treat that all concrete test blocks 10 accomplish the experiment, the push rod of observing and controlling system removes pneumatic cylinder control switch and is used for the retraction of push rod mobile hydraulic cylinder, drives push rod 11 and moves to original right side position after, opens high low temperature environment case and funnel collecting box 6's connecting piece 4, takes off funnel collecting box 6 and pours out the inefficacy waste material, then connects high low temperature environment case and funnel collecting box 6 through connecting piece 4 and be the integral type structure, treats that the next test is reserve.
The invention also has the following additional technical features:
the technical scheme of the invention is further specifically optimized as follows: high low temperature environment device is used in concrete test block mechanical properties experiment, including high low temperature environment case and funnel collecting box 6, high low temperature environment case and funnel collecting box 6 connect through connecting piece 4 and are the integral type structure.
The funnel collection box 6 is arranged vertically and used for holding the tested concrete test block 10.
High low temperature environment case is the level form setting, and both sides are provided with last briquetting 3 and lower briquetting 7 that run through high low temperature environment case about the front end of high low temperature environment case, and wherein, the top of going up briquetting 3 is connected in pressure head on loading test machine 2, and the bottom of lower briquetting 7 sets up in pressure head under loading test machine 2.
The high and low temperature environment device further comprises a movable feeding system, the movable feeding system comprises a test block base plate 9 and a push rod 11, wherein the transverse test block base plate 9 is arranged on the bottom side of the inside of the high and low temperature environment box, the push rod 11 is arranged at the tail of the test block base plate 9, the push rod 11 penetrates through the right side of the high and low temperature environment box to stretch out, and the push rod 11 can freely move left and right.
The technical scheme of the invention is further specifically optimized as follows: the high-low temperature environment box and the funnel collecting box 6 both comprise an outer shell, a heat insulation material and an inner shell, wherein the outer shell is made of a cold-rolled steel plate subjected to spraying treatment, the inner shell is made of a 1Cr18Ni9Ti stainless steel plate, and the heat insulation material arranged between the outer shell and the inner shell is made of aluminum silicate cotton for heat insulation.
The technical scheme of the invention is further specifically optimized as follows: the connecting piece 4 is in mortise-tenon joint and comprises a tenon 402 and a mortise 401, and the tenon 402 and the mortise 401 are mutually clamped and connected.
The technical scheme of the invention is further specifically optimized as follows: the funnel collection box 6 also comprises an observation window 5, and the observation window 5 is arranged at the front end of the funnel collection box 6, so that the test process can be observed conveniently; the specification of the observation window 5 is 100mm × 100 mm.
The technical scheme of the invention is further specifically optimized as follows: the test block backing plate 9 is fixedly provided with spacer blocks 8 at intervals in the front-back direction, concrete test blocks 10 are placed between the spacer blocks 8, and the spacer blocks 8 are used for limiting the concrete test blocks 10 in the front-back direction; the left and right directions interval of test block backing plate 9 is placed (the non-fixed setting) has test block baffle 13, has placed concrete test block 10 between the adjacent test block baffle 13, and a plurality of concrete test blocks can be placed in proper order to concrete test block 10.
The technical scheme of the invention is further specifically optimized as follows: scale marks are arranged on the outer side of the push rod 11; the tail of the push rod 11 is connected to a push rod moving hydraulic cylinder.
The technical scheme of the invention is further specifically optimized as follows: the high-low temperature environment device also comprises a refrigerating system, wherein the refrigerating system comprises a low-temperature air duct 15, a liquid nitrogen injection port 14, a front nitrogen pipe 1402, a rear nitrogen pipe 1401 and an external liquid nitrogen source; wherein, the front side and the rear side of the interior of the high-low temperature environment box are provided with low-temperature air ducts 15, the inner sides of the low-temperature air ducts 15 are provided with liquid nitrogen injection ports 14, and the outer sides of the low-temperature air ducts 15 are respectively connected with a forward nitrogen pipe 1402 and a backward nitrogen pipe 1401; the forward nitrogen pipe 1402 and the backward nitrogen pipe 1401 are connected to an external liquid nitrogen source; the external liquid nitrogen source comprises two 100L liquid nitrogen injection systems which supply liquid nitrogen in turn to complete the low-temperature test process.
The technical scheme of the invention is further specifically optimized as follows: the high-low temperature environment device also comprises a heating system, wherein the heating system comprises a high-temperature air duct 12, a high-temperature air jet orifice 19, a left air inlet pipe 1901, a right air inlet pipe 1902 and a fan chamber 1; wherein, the front and rear sides of the interior of the high-low temperature environment box are also provided with high-temperature air ducts 12, the inner sides of the high-temperature air ducts 12 are provided with high-temperature air injection ports 19, and the outer sides of the high-temperature air ducts 12 are respectively connected with a left air inlet pipe 1901 and a right air inlet pipe 1902; the left air inlet duct 1901 and the right air inlet duct 1902 are connected to the fan room 1; the fan room 1 is located the top of high low temperature environment case, continuously supplies air to guarantee that the temperature homogeneity satisfies the requirement in the case.
The technical scheme of the invention is further specifically optimized as follows: the inside heating element that is provided with of fan room 1, heating element generate heat after being circular telegram including being spiral helicine iron chromium aluminium resistance wire and propeller type centrifugal blower, through high temperature wind channel 12 to high low temperature environment incasement blast heating.
The technical scheme of the invention is further specifically optimized as follows: the funnel collection box 6 further comprises an air outlet 16, and the air outlet 16 is arranged on one side of the rear portion of the funnel collection box 6.
The technical scheme of the invention is further specifically optimized as follows: the junction of high low temperature environment case and funnel collecting box 6, the junction of observation window 5 and funnel collecting box 6, go up the junction of briquetting 3 and high low temperature environment case, the junction of briquetting 7 and high low temperature environment case down, the junction of push rod 11 and high low temperature environment case, the junction of nitrogen pipe 1402 and high low temperature environment case advances, the junction of nitrogen pipe 1401 and high low temperature environment case, the junction of left air-supply line 1901 and high low temperature environment case, the junction of right air-supply line 1902 and high low temperature environment case, all adopt conventional sealing ring or sealed glue to seal, reduce high low temperature environment case and external heat exchange.
The technical scheme of the invention is further specifically optimized as follows: the high-low temperature environment device also comprises a temperature measuring element, the temperature measuring element comprises a temperature sensor 17 and a temperature sensor lead 18, the temperature sensor 17 is arranged on the surface of the test block base plate 9 and clings to the concrete test block 10, and the temperature sensor 17 adopts a PT100 thermal resistor; the temperature sensor wire 18 extends through the high and low temperature environment box and is connected to the measurement and control system.
The technical scheme of the invention is further specifically optimized as follows: the high and low temperature environment device also comprises a measurement and control system, wherein the measurement and control system comprises a temperature display screen and a PLC (programmable logic controller), and the temperature display screen is connected to a temperature sensor 17 through a temperature sensor wire 18; the PLC controller comprises a temperature preset value input unit, an external liquid nitrogen source control switch, an iron-chromium-aluminum resistance wire control switch, a propeller type centrifugal blower control switch, a push rod moving hydraulic cylinder control switch and a loading tester control switch.
The technical scheme of the invention is further specifically optimized as follows: the temperature preset value input unit is used for setting the temperature of the high-low temperature environment box; the external liquid nitrogen source control switch is used for controlling the input amount of the external liquid nitrogen source; the iron-chromium-aluminum resistance wire control switch is used for controlling the heating temperature and time of the iron-chromium-aluminum resistance wire; the control switch of the propeller type centrifugal blower is used for controlling the wind power and time of the propeller type centrifugal blower; the push rod moving hydraulic cylinder control switch is used for advancing and retracting the push rod moving hydraulic cylinder; the control switch of the loading tester is used for controlling the working state of the loading tester 2 and simultaneously driving the upper pressing block 3 to move up or down.
Compared with the prior art, the invention has the advantages that:
the high-low temperature environment test box can be used for placing a plurality of concrete test blocks 10 at one time, the concrete test blocks 10 can be replaced through the movable push rod 11, the concrete test blocks 10 are in a constant-temperature environment, and the test of the plurality of concrete test blocks 10 can be completed at one time, so that the standard of detecting the plurality of concrete test blocks 10 at one time in China is met, the test precision is improved, the test efficiency is greatly improved, and resources are saved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic front view of the high and low temperature environment apparatus of the present invention;
FIG. 2 is a schematic top view of the portion of FIG. 1;
FIG. 3 is a schematic side view of the portion of FIG. 1;
FIG. 4 is a schematic structural diagram of a connecting member 4 of the high and low temperature environment apparatus according to the present invention;
FIGS. 5-6 are schematic views illustrating the usage of the high and low temperature environment apparatus according to the present invention;
FIG. 7 is a schematic diagram of a logic structure of the high and low temperature environment apparatus according to the present invention.
In the figure: the device comprises a fan room 1, a loading tester 2, an upper pressing block 3, a connecting piece 4, an observation window 5, a funnel collecting box 6, a lower pressing block 7, a spacer block 8, a test block base plate 9, a concrete test block 10, a push rod 11, a high-temperature air channel 12, a test block baffle 13, a liquid nitrogen jet orifice 14, a low-temperature air channel 15, an air outlet 16, a temperature sensor 17, a temperature sensor lead 18 and a high-temperature air jet orifice 19.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings, in order that the present disclosure may be more fully understood and fully conveyed to those skilled in the art. While the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the invention is not limited to the embodiments set forth herein.
An operation method of a high-low temperature environment device for a concrete test block mechanical property test comprises the following steps:
before the test, the connecting piece 4 of the high-low temperature environment box and the funnel collecting box 6 is opened, the concrete test blocks 10 and the spacer blocks 8 are sequentially placed on the test block base plate 9 from inside to outside until the last concrete test block 10 is positioned between the upper pressing block 3 and the lower pressing block 7. Then connect high low temperature environment case and funnel collecting box 6 through connecting piece 4 and be the integral type structure, inspect load test machine 2, refrigerating system, heating system and measurement and control system, prepare the experiment, the experiment includes high temperature test or/and low temperature test.
During a low-temperature test, (1) power supplies of all devices are turned on, a temperature preset value input unit is used for setting the temperature X of the high-low temperature environment box, for example, X is-170 ℃, a temperature sensor 17 monitors the temperature of the concrete test block 10 in real time, and when the temperature of the high-low temperature environment box does not reach-170 ℃, an external liquid nitrogen source control switch of a measurement and control system is used for controlling the input amount of an external liquid nitrogen source to be increased, so that the temperature of the high-low temperature environment box reaches-170 ℃; then an external liquid nitrogen source control switch of the measurement and control system is used for controlling the input of the external liquid nitrogen source to be reduced until the temperature of the high-low temperature environment box reaches-170 ℃ and keeps basically constant for 48 hours; and after 48h, the external liquid nitrogen source control switch is used for controlling the input of the external liquid nitrogen source to be continuously reduced so as to maintain the temperature to be unchanged in the pressure test process. (2) The control switch of the loading tester is used for controlling the working state of the loading tester 2, the loading tester 2 starts to work, the compression strength of the axis of the concrete is measured by the loading tester 2, the upper pressing block 3 moves downwards, the first concrete test block 10 is subjected to a crushing test, and the upper pressing block 3 moves upwards after the first concrete test block 10 fails to be crushed. A push rod moving hydraulic cylinder control switch of the measurement and control system is used for advancing the push rod moving hydraulic cylinder to drive the push rod 11 to push forwards, so that the crushed invalid concrete test block 10 and the test block baffle 13 are pushed forwards into the funnel collection box 6, and the next concrete test block 10 is pushed to a region to be tested; and so on until all the concrete test blocks 10 finish the test; and recording the failure pressure value of each concrete test block 10 during the test, wherein the failure pressure value is the compressive strength of the concrete axle center.
During a high-temperature test, (1) power supplies of all equipment are turned on, a temperature preset value input unit is used for setting the temperature Y of the high-temperature and low-temperature environment box, for example, Y is 100 ℃, a temperature sensor 17 monitors the temperature of the concrete test block 10 in real time, when the temperature of the high-temperature and low-temperature environment box does not reach 100 ℃, an iron-chromium-aluminum resistance wire control switch of a measurement and control system is used for controlling the heating temperature of the iron-chromium-aluminum resistance wire to rise, and a propeller type centrifugal blower control switch is used for controlling the wind power of a propeller type centrifugal blower to increase, so that the temperature of the high-temperature; then an iron chromium aluminum resistance wire control switch of the measurement and control system is used for controlling the reduction of the heating temperature of the iron chromium aluminum resistance wire, and a propeller type centrifugal blower control switch is used for controlling the reduction of the wind power of the propeller type centrifugal blower until the temperature of the high and low temperature environment box reaches 100 ℃ and keeps the temperature basically constant for 48 hours; and after 48h, the iron-chromium-aluminum resistance wire control switch is used for controlling the iron-chromium-aluminum resistance wire to reduce heating, and the propeller type centrifugal blower control switch is used for controlling the wind power of the propeller type centrifugal blower to continuously reduce so as to keep the temperature unchanged in the pressure test process. (2) The control switch of the loading tester is used for controlling the working state of the loading tester 2, the loading tester 2 starts to work, the compression strength of the axis of the concrete is measured by the loading tester 2, the upper pressing block 3 moves downwards, the first concrete test block 10 is subjected to a crushing test, and the upper pressing block 3 moves upwards after the first concrete test block 10 fails to be crushed. A push rod moving hydraulic cylinder control switch of the measurement and control system is used for advancing the push rod moving hydraulic cylinder to drive the push rod 11 to push forwards, so that the crushed invalid concrete test block 10 and the test block baffle 13 are pushed forwards into the funnel collection box 6, and the next concrete test block 10 is pushed to a region to be tested; and so on until all the concrete test blocks 10 finish the test; and recording the failure pressure value of each concrete test block 10 during the test, wherein the failure pressure value is the compressive strength of the concrete axle center.
After the test, treat that all concrete test blocks 10 accomplish the experiment, the push rod of observing and controlling system removes pneumatic cylinder control switch and is used for the retraction of push rod mobile hydraulic cylinder, drives push rod 11 and moves to original right side position after, opens high low temperature environment case and funnel collecting box 6's connecting piece 4, takes off funnel collecting box 6 and pours out the inefficacy waste material, then connects high low temperature environment case and funnel collecting box 6 through connecting piece 4 and be the integral type structure, treats that the next test is reserve.
The high-low temperature environment device for the mechanical property test of the concrete test block can realize the environment temperature change of minus 170 ℃ to plus 100 ℃, and comprises a high-low temperature environment box and a funnel collecting box 6.
The high-low temperature environment box and the funnel collecting box 6 both comprise an outer shell, a heat insulation material and an inner shell, wherein the outer shell is made of a cold-rolled steel plate subjected to spraying treatment, the inner shell is made of a 1Cr18Ni9Ti stainless steel plate, and the heat insulation material arranged between the outer shell and the inner shell is made of aluminum silicate cotton for heat insulation.
The high and low temperature environment box is horizontally arranged, the funnel collection box 6 is vertically arranged and used for holding the tested concrete test block 10, and the high and low temperature environment box and the funnel collection box 6 are connected through a connecting piece 4 to form an integrated structure; the connecting piece 4 is in mortise-tenon joint and comprises a tenon 402 and a mortise 401, and the tenon 402 and the mortise 401 are mutually clamped and connected.
The funnel collection box 6 also comprises an observation window 5, and the observation window 5 is arranged at the front end of the funnel collection box 6, so that the test process can be observed conveniently; the specification of the observation window 5 is 100mm × 100 mm.
The high and low temperature environment device further comprises a movable feeding system, the movable feeding system comprises a test block base plate 9 and a push rod 11, wherein the transverse test block base plate 9 is arranged on the bottom side of the inside of the high and low temperature environment box, spacer blocks 8 are fixedly arranged in the front and back direction of the test block base plate 9 at intervals, concrete test blocks 10 are placed between the spacer blocks 8, and the spacer blocks 8 are used for limiting the concrete test blocks 10 in the front and back directions.
The left and right directions interval of test block backing plate 9 is placed (the non-fixed setting) has test block baffle 13, has placed concrete test block 10 between the adjacent test block baffle 13, and a plurality of concrete test blocks can be placed in proper order to concrete test block 10.
The tail part of the test block base plate 9 is provided with a push rod 11, the push rod 11 penetrates through the right side of the high-temperature and low-temperature environment box to extend out, and the push rod 11 can freely move left and right. Scale marks are arranged on the outer side of the push rod 11; the tail of the push rod 11 is connected to a push rod moving hydraulic cylinder.
Both sides are provided with last briquetting 3 and lower briquetting 7 that run through high low temperature environment case about the front end of high low temperature environment case, and wherein, the top of going up briquetting 3 is connected in pressure head on loading test machine 2, and the bottom of lower briquetting 7 sets up in pressure head under loading test machine 2.
The high-low temperature environment device also comprises a refrigerating system, wherein the refrigerating system comprises a low-temperature air duct 15, a liquid nitrogen injection port 14, a front nitrogen pipe 1402, a rear nitrogen pipe 1401 and an external liquid nitrogen source; wherein, the front side and the rear side of the interior of the high-low temperature environment box are provided with low-temperature air ducts 15, the inner sides of the low-temperature air ducts 15 are provided with liquid nitrogen injection ports 14, and the outer sides of the low-temperature air ducts 15 are respectively connected with a forward nitrogen pipe 1402 and a backward nitrogen pipe 1401; the forward nitrogen pipe 1402 and the backward nitrogen pipe 1401 are connected to an external liquid nitrogen source; the external liquid nitrogen source comprises two 100L liquid nitrogen injection systems which supply liquid nitrogen in turn to complete the low-temperature test process.
The high-low temperature environment device also comprises a heating system, wherein the heating system comprises a high-temperature air duct 12, a high-temperature air jet orifice 19, a left air inlet pipe 1901, a right air inlet pipe 1902 and a fan chamber 1; wherein, the front and rear sides of the interior of the high-low temperature environment box are also provided with high-temperature air ducts 12, the inner sides of the high-temperature air ducts 12 are provided with high-temperature air injection ports 19, and the outer sides of the high-temperature air ducts 12 are respectively connected with a left air inlet pipe 1901 and a right air inlet pipe 1902; the left air inlet duct 1901 and the right air inlet duct 1902 are connected to the fan room 1; the fan room 1 is located the top of high low temperature environment case, continuously supplies air to guarantee that the temperature homogeneity satisfies the requirement in the case.
The inside heating element that is provided with of fan room 1, heating element generate heat after being circular telegram including being spiral helicine iron chromium aluminium resistance wire and propeller type centrifugal blower, through high temperature wind channel 12 to high low temperature environment incasement blast heating.
The funnel collection box 6 further comprises an air outlet 16, and the air outlet 16 is arranged on one side of the rear portion of the funnel collection box 6.
The junction of high low temperature environment case and funnel collecting box 6, the junction of observation window 5 and funnel collecting box 6, go up the junction of briquetting 3 and high low temperature environment case, the junction of briquetting 7 and high low temperature environment case down, the junction of push rod 11 and high low temperature environment case, the junction of nitrogen pipe 1402 and high low temperature environment case advances, the junction of nitrogen pipe 1401 and high low temperature environment case, the junction of left air-supply line 1901 and high low temperature environment case, the junction of right air-supply line 1902 and high low temperature environment case, all adopt conventional sealing ring or sealed glue to seal, reduce high low temperature environment case and external heat exchange.
The high-low temperature environment device also comprises a temperature measuring element, the temperature measuring element comprises a temperature sensor 17 and a temperature sensor lead 18, the temperature sensor 17 is arranged on the surface of the test block base plate 9 and clings to the concrete test block 10, and the temperature sensor 17 adopts a PT100 thermal resistor; the temperature sensor wire 18 extends through the high and low temperature environment box and is connected to the measurement and control system.
The high and low temperature environment device also comprises a measurement and control system, wherein the measurement and control system comprises a temperature display screen and a PLC (programmable logic controller), and the temperature display screen is connected to a temperature sensor 17 through a temperature sensor wire 18; the PLC controller comprises a temperature preset value input unit, an external liquid nitrogen source control switch, an iron-chromium-aluminum resistance wire control switch, a propeller type centrifugal blower control switch, a push rod moving hydraulic cylinder control switch and a loading tester control switch.
The temperature preset value input unit is used for setting the temperature of the high-low temperature environment box. And the external liquid nitrogen source control switch is used for controlling the input amount of the external liquid nitrogen source. The iron chromium aluminum resistance wire control switch is used for controlling the heating temperature and time of the iron chromium aluminum resistance wire. The control switch of the propeller type centrifugal blower is used for controlling the wind power and time of the propeller type centrifugal blower. And the push rod moving hydraulic cylinder control switch is used for advancing and retracting the push rod moving hydraulic cylinder. The control switch of the loading tester is used for controlling the working state of the loading tester 2 and simultaneously driving the upper pressing block 3 to move up or down.
The PLC adopts a building door electric PID adjusting instrument; the PLC controller also comprises a safety protection system which is conventionally arranged, and the safety protection system comprises electric leakage protection, over-current protection and a fast fuse.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described above with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the above detailed description of the embodiments of the invention presented in the drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (10)
1. An operation method of a high-low temperature environment device for a concrete test block mechanical property test is characterized by comprising the following steps:
before testing, a connecting piece (4) of a high-low temperature environment box and a funnel collecting box (6) is opened, and concrete test blocks (10) and spacer blocks (8) are sequentially placed on a test block base plate (9) from inside to outside until the last concrete test block (10) is positioned between an upper pressing block (3) and a lower pressing block (7); then connecting the high-low temperature environment box and the funnel collection box (6) through a connecting piece (4) to form an integrated structure, checking the loading testing machine (2), the refrigerating system, the heating system and the measurement and control system, and preparing tests, wherein the tests comprise high-temperature tests or/and low-temperature tests;
during a low-temperature test, (1) turning on power supplies of all equipment, wherein a temperature preset value input unit is used for setting the temperature X of a high-low temperature environment box, a temperature sensor (17) monitors the temperature of a concrete test block (10) in real time, and when the temperature of the high-low temperature environment box does not reach X ℃, an external liquid nitrogen source control switch of a measurement and control system is used for controlling the input quantity of an external liquid nitrogen source to be increased, so that the temperature of the high-low temperature environment box reaches X ℃; then an external liquid nitrogen source control switch of the measurement and control system is used for controlling the input of the external liquid nitrogen source to be reduced until the temperature of the high-low temperature environment box reaches X ℃ and keeps basically constant for 48 hours; after 48h, the external liquid nitrogen source control switch is used for controlling the input of the external liquid nitrogen source to be continuously reduced so as to keep the temperature unchanged in the pressure test process;
(2) the control switch of the loading tester is used for controlling the working state of the loading tester (2), the loading tester (2) starts to work, the loading tester (2) is used for measuring the compressive strength of the axle center of the concrete, the upper pressing block (3) moves downwards, the first concrete test block (10) is subjected to a crushing test, and the upper pressing block (3) moves upwards after the current concrete test block (10) is subjected to crushing failure; a push rod moving hydraulic cylinder control switch of the measurement and control system is used for advancing the push rod moving hydraulic cylinder to drive the push rod (11) to push forwards, so that the crushed invalid concrete test block (10) and the test block baffle (13) are pushed forwards into the funnel collection box (6), and the next concrete test block (10) is pushed to a region to be tested; the analogy is carried out in sequence until all the concrete test blocks (10) are tested; recording the failure pressure value of each concrete test block (10) during the test, wherein the failure pressure value is the compressive strength of the concrete axle center;
during a high-temperature test, (1) turning on power supplies of all equipment, wherein a temperature preset value input unit is used for setting the temperature Y of a high-temperature and low-temperature environment box, a temperature sensor (17) monitors the temperature of a concrete test block (10) in real time, when the temperature of the high-temperature and low-temperature environment box does not reach Y ℃, an iron-chromium-aluminum resistance wire control switch of a measurement and control system is used for controlling the heating temperature of the iron-chromium-aluminum resistance wire to rise, and a propeller type centrifugal blower control switch is used for controlling the wind power of a propeller type centrifugal blower to increase, so that the temperature of the high; then an iron chromium aluminum resistance wire control switch of the measurement and control system is used for controlling the reduction of the heating temperature of the iron chromium aluminum resistance wire, and a propeller type centrifugal blower control switch is used for controlling the reduction of the wind power of the propeller type centrifugal blower until the temperature of the high and low temperature environment box reaches Y ℃ and keeps the temperature basically constant for 48 hours; after 48h, the iron-chromium-aluminum resistance wire control switch is used for controlling the iron-chromium-aluminum resistance wire to reduce heating, and the propeller type centrifugal blower control switch is used for controlling the wind power of the propeller type centrifugal blower to continuously reduce so as to keep the temperature unchanged in the pressure test process;
(2) the control switch of the loading tester is used for controlling the working state of the loading tester (2), the loading tester (2) starts to work, the loading tester (2) is used for measuring the compressive strength of the axle center of the concrete, the upper pressing block (3) moves downwards, the first concrete test block (10) is subjected to a crushing test, and the upper pressing block (3) moves upwards after the current concrete test block (10) is subjected to crushing failure; a push rod moving hydraulic cylinder control switch of the measurement and control system is used for advancing the push rod moving hydraulic cylinder to drive the push rod (11) to push forwards, so that the crushed invalid concrete test block (10) and the test block baffle (13) are pushed forwards into the funnel collection box (6), and the next concrete test block (10) is pushed to a region to be tested; the analogy is carried out in sequence until all the concrete test blocks (10) are tested; recording the failure pressure value of each concrete test block (10) during the test, wherein the failure pressure value is the compressive strength of the concrete axle center;
after the test, treat that all concrete test blocks (10) accomplish the experiment, the push rod of observing and controlling system removes pneumatic cylinder control switch and is used for the retraction of push rod mobile hydraulic cylinder, it moves to original right side position to drive push rod (11) back, open connecting piece (4) of high low temperature environment case and funnel collecting box (6), take off funnel collecting box (6) and pour out the inefficacy waste material, then connect high low temperature environment case and funnel collecting box (6) through connecting piece (4) and be the integral type structure, treat that the next test is reserve.
2. The operation method of the high and low temperature environment device for the mechanical property test of the concrete test block is characterized in that the high and low temperature environment device for the mechanical property test of the concrete test block comprises a high and low temperature environment box and a funnel collection box (6), wherein the funnel collection box (6) is vertically arranged and is used for holding the tested concrete test block (10); the high-low temperature environment box and the funnel collecting box (6) are connected through a connecting piece (4) to form an integrated structure;
the high-low temperature environment box is horizontally arranged, an upper pressing block (3) and a lower pressing block (7) which penetrate through the high-low temperature environment box are arranged on the upper side and the lower side of the front end of the high-low temperature environment box, the top of the upper pressing block (3) is connected to an upper pressing head of the loading testing machine (2), and the bottom of the lower pressing block (7) is arranged on a lower pressing head of the loading testing machine (2);
the high and low temperature environment device further comprises a movable feeding system, the movable feeding system comprises a test block base plate (9) and a push rod (11), wherein the test block base plate (9) is transversely arranged on the bottom side of the inside of the high and low temperature environment box, the push rod (11) is arranged at the tail of the test block base plate (9), the push rod (11) penetrates through the right side of the high and low temperature environment box to extend out, and the push rod (11) can freely move left and right.
3. The method for operating the high and low temperature environment device for the mechanical property test of the concrete test block as claimed in claim 2, wherein the high and low temperature environment box and the funnel collection box (6) each comprise an outer shell, a heat insulation material and an inner shell, wherein the outer shell is made of a cold-rolled steel plate subjected to spraying treatment, the inner shell is made of a 1Cr18Ni9Ti stainless steel plate, and the heat insulation material arranged between the outer shell and the inner shell is heat insulation of aluminum silicate wool.
4. The operation method of the high and low temperature environment device for the mechanical property test of the concrete test block is characterized in that the connecting piece (4) is in mortise-tenon connection and comprises a tenon (402) and a mortise (401), and the tenon (402) and the mortise (401) are mutually clamped and connected;
the funnel collection box (6) further comprises an observation window (5), and the observation window (5) is arranged at the front end of the funnel collection box (6).
5. The operation method of the high and low temperature environment device for the mechanical property test of the concrete test block is characterized in that the test block backing plate (9) is fixedly provided with spacing blocks (8) at intervals in the front and back direction, the concrete test block (10) is placed between the spacing blocks (8), and the spacing blocks (8) are used for limiting the front and back of the concrete test block (10); test block baffles (13) are arranged at intervals in the left-right direction of the test block base plate (9), concrete test blocks (10) are arranged between the adjacent test block baffles (13), and the concrete test blocks (10) can be sequentially provided with a plurality of concrete test blocks;
scale marks are arranged on the outer side of the push rod (11); the tail part of the push rod (11) is connected with a push rod moving hydraulic cylinder.
6. The operation method of the high-low temperature environment device for the concrete test block mechanical property test is characterized in that the high-low temperature environment device further comprises a refrigeration system, and the refrigeration system comprises a low-temperature air duct (15), a liquid nitrogen injection port (14), a front nitrogen pipe (1402), a rear nitrogen pipe (1401) and an external liquid nitrogen source; wherein, the front side and the rear side of the interior of the high-low temperature environment box are provided with low-temperature air ducts (15), the inner sides of the low-temperature air ducts (15) are provided with liquid nitrogen injection ports (14), and the outer sides of the low-temperature air ducts (15) are respectively connected with a forward nitrogen pipe (1402) and a backward nitrogen pipe (1401); the forward nitrogen pipe (1402) and the backward nitrogen pipe (1401) are connected to an external liquid nitrogen source.
7. The operation method of the high and low temperature environment device for the mechanical property test of the concrete test block is characterized in that the high and low temperature environment device further comprises a heating system, and the heating system comprises a high temperature air duct (12), a high temperature air injection opening (19), a left air inlet pipe (1901), a right air inlet pipe (1902) and a fan room (1); wherein, the front side and the rear side of the interior of the high-low temperature environment box are also provided with high-temperature air channels (12), the inner sides of the high-temperature air channels (12) are provided with high-temperature air jet orifices (19), and the outer sides of the high-temperature air channels (12) are respectively connected with a left air inlet pipe (1901) and a right air inlet pipe (1902); the left air inlet pipe (1901) and the right air inlet pipe (1902) are connected to the fan chamber (1); the fan room (1) is positioned above the high-low temperature environment box;
a heating component is arranged in the fan chamber (1), the heating component comprises a spiral iron-chromium-aluminum resistance wire and a propeller type centrifugal blower, the iron-chromium-aluminum resistance wire generates heat after being electrified, and the heat is blown into the high-temperature and low-temperature environment box for heating through a high-temperature air channel (12) by the propeller type centrifugal blower;
the funnel collection box (6) further comprises an air outlet (16), and the air outlet (16) is arranged on one side of the rear portion of the funnel collection box (6).
8. The operation method of the high and low temperature environment device for the concrete test block mechanical property test according to claim 2, wherein the joint of the high and low temperature environment box and the funnel collection box (6), the joint of the observation window (5) and the funnel collection box (6), the joint of the upper pressing block (3) and the high and low temperature environment box, the joint of the lower pressing block (7) and the high and low temperature environment box, the joint of the push rod (11) and the high and low temperature environment box, the joint of the forward nitrogen pipe (1402) and the high and low temperature environment box, the joint of the backward nitrogen pipe (1401) and the high and low temperature environment box, the joint of the left air inlet pipe (1901) and the high and low temperature environment box, and the joint of the right air inlet pipe (1902) and the high and low temperature environment box are sealed by using conventional sealing rings or sealants.
9. The operation method of the high and low temperature environment device for the mechanical property test of the concrete test block is characterized in that the high and low temperature environment device further comprises a temperature measuring element, the temperature measuring element comprises a temperature sensor (17) and a temperature sensor lead (18), the temperature sensor (17) is arranged on the surface of the test block base plate (9) and is tightly attached to the concrete test block (10), and the temperature sensor (17) adopts a PTY thermal resistor; and a temperature sensor lead (18) penetrates out of the high-temperature environment box and the low-temperature environment box and is connected with the measurement and control system.
10. The operation method of the high and low temperature environment device for the mechanical property test of the concrete test block is characterized in that the high and low temperature environment device further comprises a measurement and control system, the measurement and control system comprises a temperature display screen and a PLC (programmable logic controller), wherein the temperature display screen is connected to a temperature sensor (17) through a temperature sensor lead (18); the PLC controller comprises a temperature preset value input unit, an external liquid nitrogen source control switch, an iron-chromium-aluminum resistance wire control switch, a propeller type centrifugal blower control switch, a push rod moving hydraulic cylinder control switch and a loading tester control switch;
the temperature preset value input unit is used for setting the temperature of the high-low temperature environment box; the external liquid nitrogen source control switch is used for controlling the input amount of the external liquid nitrogen source; the iron-chromium-aluminum resistance wire control switch is used for controlling the heating temperature and time of the iron-chromium-aluminum resistance wire; the control switch of the propeller type centrifugal blower is used for controlling the wind power and time of the propeller type centrifugal blower; the push rod moving hydraulic cylinder control switch is used for advancing and retracting the push rod moving hydraulic cylinder; the control switch of the loading tester is used for controlling the working state of the loading tester (2) and simultaneously driving the upper pressing block (3) to move up or down.
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