CN113639888A - Method for judging temperature uniformity of environmental experiment chamber and measuring device - Google Patents
Method for judging temperature uniformity of environmental experiment chamber and measuring device Download PDFInfo
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- G01K13/00—Thermometers specially adapted for specific purposes
Abstract
The invention discloses a method and a device for judging temperature uniformity of an environmental experiment chamber, which are used for determining the number n of temperature measuring points in the vertical direction and the number m of temperature measuring points in the horizontal direction of a test position; measuring according to the determined n and m; acquiring temperature data of a measuring point; forming a n multiplied by m order temperature test matrix; calculating the sum T of the temperature data of all the measuring points at the test positionn(ii) a The sum T of the temperature data of all the measuring points; sum of squared deviations Δ of temperature data for all measurement pointsGeneral of(ii) a Sum of squared deviations Δ between test position dataBetween groups(ii) a Sum of squared deviations Δ within test position dataIn group(ii) a Determining the degree of freedom and the mean square sum of each dispersion square sum of the test positions; and calculating the rejection area F of the test position. The problem that the temperature distribution of the existing large-environment experiment chamber is complex, and when the temperature change condition in the chamber body is detected, too many temperature sensors are needed to be used, so that the experiment work is additionally increased frequently is solvedHeavy workload.
Description
Technical Field
The invention relates to the technical field of environmental test analysis and evaluation, in particular to a method and a device for judging temperature uniformity of an environmental test chamber.
Background
A large-scale environmental experiment chamber is a scientific instrument used in the field of basic disciplines of engineering and technical science, when carrying out product environmental tests, besides on-site environmental tests, more means of indoor environmental tests are used, the purposes and volumes of products are different, the sizes of required environmental experiment chambers are different, high-low temperature tests are the most tests developed by the current environmental experiment chambers, the quality of temperature load uniformity and reducibility is directly related to the accuracy of test results, when the environmental experiment chamber is smaller, because the volume is smaller, the temperature environmental condition uniformity and reducibility are better, when carrying out indoor temperature load uniformity and reducibility judgment, one point is usually adopted for judgment, and for the environmental experiment chamber with larger volume (such as thousands of cubic meters), if the air outlet is designed to be one, the problem of temperature uniformity inevitably exists, at the moment, the temperature data of 1 measuring point or a plurality of measuring points represent the condition of the whole environmental experiment chamber, on one side, in principle, the farther the measuring point is away from the air outlet, the more difficult the temperature data can reach the target temperature, and under the condition of a test prototype, the more complicated the temperature distribution condition is, the more effective and real the temperature condition of each part in the cabin is mastered, and the more important the accuracy and credibility of the test result is;
the invention patent application CN111203289A in China proposes 'an environmental chamber temperature uniformity testing method and a sample holding device', the device can meet the bearing requirements of different positions of a sample and measuring equipment, is convenient for sensor arrangement and fixation, avoids physical injury to operators caused by temperature experiments, and reduces errors caused by manual operation in the test process;
the invention patent CN103252260B in China proposes 'an environment cabin temperature control device for indoor use', the device overcomes the defects of the existing small environment cabin temperature control method, can adjust the temperature generated by a semiconductor refrigeration piece according to the detection result of the temperature in the actual environment cabin, controls the required cold quantity and heat quantity, and can maintain the temperature set by the environment cabin through reasonable structural design;
because the environment experiment chamber with larger volume has more complex temperature distribution condition, more temperature sensors need to be arranged for monitoring the temperature change condition in the chamber; using too many temperature sensors would add an additional burdensome task to the testing work; at present, the judgment of the uniformity of temperature data in the environmental experiment cabin adopts one point or a plurality of points of test data, and the judgment is carried out by artificial subjectivity, so that the judgment result is relatively one-sided and has possible deviation;
therefore, a method for judging temperature uniformity of the environmental experiment chamber and a measuring device are provided.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method and a device for judging temperature uniformity of an environmental experiment chamber.
In order to achieve the purpose, the invention provides the following technical scheme:
determining the number n of temperature measuring points in the vertical direction and the number m of temperature measuring points in the horizontal direction of the test position;
measuring according to the determined n and m;
acquiring temperature data of the measuring points to form an n x m-order temperature test matrix;
calculating the sum T of the temperature data of all the measuring points at the test positionnThe sum T of the temperature data of all the measuring points, and the square sum delta of the deviations of the temperature data of all the measuring pointsGeneral ofThe sum of squared deviations Δ between the test position dataBetween groupsSum of squared deviations Δ inside the test position dataIn group(ii) a Determining the degree of freedom and the mean square sum of each dispersion square sum of the test positions; calculating a rejection area F of the test position;
comparing the rejection region F with a critical value in an F distribution table;
calculating a range gamma, a deviation kappa and a fluctuation degree theta in response to the rejection region F being smaller than a critical value in an F distribution table;
comparing the range gamma with a range threshold, the deviation kappa with a deviation threshold, and the fluctuation theta with a fluctuation threshold to obtain a comparison result;
and obtaining a temperature uniformity judgment result of the environmental experiment chamber according to the comparison result.
Preferably, T of all measuring point temperature datanAnd the sum T of the temperature data of all the measuring points is calculated according to the following formula:
wherein said T isnmThe temperature value of the nth row and the mth column in the matrix is shown.
Preferably, the sum of squares of the test site temperature data sum, and the sum of squares of the temperature data sums are calculated by the formula:
wherein said T isijRepresenting the test value of the ith row and the jth column in the temperature test matrix;
the T isiRepresenting the sum of the temperature data of each row in the temperature test matrix;
the T represents the sum of all data of the temperature test matrix;
sum of squared deviations Δ of all the test dataGeneral ofThe calculation formula is as follows:
said ΔGeneral ofRepresenting the sum of squared deviations of the data population;
sum of squared deviations Δ between the test position dataBetween groupsThe calculation formula is as follows:
said ΔBetween groupsRepresenting the sum of squares of the differences between each group of data;
sum of squared deviations Δ within the test position test dataIn groupThe calculation formula is as follows:
Δin group＝ΔGeneral of-ΔBetween groups；
The degree of freedom of the sum of squares of the deviations is calculated by the following formula:
the critical value is F1-α(dfA，dfe) The value of the alpha is 0.01 or 0.05;
the mean square sum is calculated by the formula:
preferably, the calculation method of the range gamma is as follows:
γ＝Tmax-Tmin；
the T ismaxThe maximum temperature value of the measuring point is obtained;
the T isminThe minimum temperature value of the measuring point is obtained;
the deviation κ is calculated as:
κ＝|Ttarget value-Tnm|；
The T isTarget valueIs a target temperature value;
the calculation method of the fluctuation degree theta comprises the following steps:
θ＝Tmaximum amplitude-TMinimum amplitude；
The T isMaximum amplitudeThe maximum value of the temperature fluctuation of a certain measuring point is obtained;
the T isMinimum amplitudeThe minimum value of the temperature fluctuation of a certain measuring point is obtained;
further, according to the comparison result, obtaining an environment experiment chamber temperature uniformity judgment result, comprising: and the range gamma does not exceed a range threshold, the deviation kappa does not exceed a deviation threshold, and the fluctuation theta does not exceed a fluctuation threshold, and the environment experiment chamber temperature uniformity is judged to meet the requirement.
The environment experiment chamber temperature measuring device comprises a moving rod, a telescopic rod and a horizontal moving device, wherein the moving rod can be provided with a plurality of temperature sensors, the telescopic rod can be provided with a plurality of temperature sensors, and the horizontal moving device is arranged along a first direction; the horizontal moving device is connected with a supporting beam arranged along a third direction, and the supporting beam is connected with a top beam arranged along a second direction; the top beam is provided with a lifting device, the moving rod is arranged along a second direction, is connected to the lifting device and can move along a third direction under the driving of the lifting device, the telescopic rod is arranged along the third direction and can be telescopic under the driving of a telescopic motor, the telescopic rod is movably arranged on the top beam through a sliding device and can move back and forth on the top beam along the second direction under the driving of the sliding device; the horizontal moving device can drive the supporting beam, the lifting device and the top beam to move along a first direction, so that the moving rod and the telescopic rod are driven to move synchronously.
Furthermore, the first direction, the second direction and the third direction are mutually vertical pairwise.
Furthermore, the third direction is a vertical direction, and the first direction and the second direction are two mutually perpendicular directions on a horizontal plane.
The device has the advantages that the number of used temperature sensors is small, multi-point temperature data measurement can be realized by one-time arrangement, multi-point testing can be carried out, distribution steps of effective reaction temperature are effectively realized, high and low temperature environment experiments are carried out, and the result is more accurate.
Preferably, the horizontal moving device comprises horizontal driving motors symmetrically installed on the ground, and the output ends of the horizontal driving motors are connected with horizontal lead screws; horizontal guide rails are arranged on two sides of the horizontal screw rod, guide rail seats are arranged on the horizontal guide rails, and the guide rail seats are in threaded connection with the bottoms of the supporting beams through bolts; and two axial ends of the horizontal guide rail are provided with limiting blocks.
The horizontal screw rod is connected with the horizontal driving motor through a flange plate, the horizontal driving motor is fixed on the ground, and the horizontal screw rod only performs rotary motion and does not perform translational motion; the horizontal driving motor is connected with an external control system, is controlled in a displacement mode, can rotate forwards or backwards, drives the whole device to move forwards when rotating forwards, and drives the whole device to move backwards when rotating backwards; wherein the horizontal guide rail is arranged on the ground and is close to the wall of the environment experiment chamber.
Preferably, elevating gear is including installing top driving motor on the back timber, top driving motor's output is connected with vertical lead screw, vertical lead screw axial one end extends to in the supporting beam, be equipped with the liftable sliding block on the vertical lead screw, be equipped with on the sliding block the carriage release lever.
A threaded hole with the aperture of 68mm is formed in the bottom of the supporting beam in the longitudinal direction, a horizontal lead screw is installed in the threaded hole, and the length of the horizontal lead screw is larger than that of the threaded hole; a through hole with the aperture of 50mm is formed in the center of the top of the supporting beam, the vertical lead screw is vertically placed through the through hole, and a circular groove with the aperture of 50mm is formed in the center of the bottom of the supporting beam and used for limiting the vertical lead screw to only rotate; the top of the vertical screw rod is connected with a top driving motor through a flange plate, and the top driving motor is fixed to the top of the supporting beam and is vertically arranged; the top driving motor can rotate forwards or reversely to drive the vertical lead screw to rotate, so that the sliding block can lift on the vertical lead screw, and the moving rod can move up and down.
Preferably, a baffle groove matched with the vertical screw rod is arranged in the support beam, and the inner wall of the baffle groove is connected with the sliding block in a sliding manner; a circular groove is formed in one side of the sliding block, and the moving rod is installed in the circular groove; the two axial ends of the moving rod are of spring telescopic structures, and a thermal resistance type temperature sensor is arranged in the mounting hole of the moving rod.
The center of the sliding block is provided with a threaded hole with the aperture of 50mm, the sliding block is arranged on the vertical screw rod 14, the sliding block is matched with the baffle groove, and the movement in the vertical direction is realized through the groove on the baffle groove; wherein the baffle slots are arranged on the support beam through bolts, the baffle slots on two sides are symmetrically arranged, and the side wall of each baffle slot is provided with a vertical groove; the two ends of the movable rod are of spring telescopic structures, so that the movable rod can be conveniently installed in sliding blocks on two sides, and the diameter of a hole of the installation hole is larger than that of the thermal resistance type temperature sensor.
Preferably, the sliding device comprises a mobile motor installed on the upper end surface of the top cover, a main gear is arranged at the output end of the mobile motor, a pinion is meshed with the main gear, a rod body is fixed in the pinion, two axial ends of the rod body are movably connected with rollers, and the rollers are connected in the sliding rail in a sliding manner; the slide rail is installed in the outside of back timber.
When the movable motor runs, the main gear is driven to run, the auxiliary gear is driven to rotate through the main gear, and when the auxiliary gear rotates, the rod body and the roller are synchronously driven to move in the slide rail; when the moving motor drives the rollers at the two sides to move along the sliding rail, the top cover can realize reciprocating motion on the top guide rail.
Preferably, the top guide rail is installed on the inner side of the top beam, and both ends of the top guide rail are provided with limit blocks.
Through setting up the stopper, can prevent that the condition that the slippage from appearing in the gyro wheel from appearing.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the prior art, the invention has the advantages that the number of the temperature sensors is small, multi-point temperature data measurement can be realized by one-time arrangement, and the temperature sensors can be used for a long time; 2. compared with the prior art, the invention has more accurate detection result, can really master the temperature conditions of all the positions in the cabin, and ensures that the accuracy of the detection result is higher; 3. compared with the prior art, the invention has the advantages of simple installation, convenient operation, one-time installation and repeated use, effectively reduces manpower and saves time.
Drawings
FIG. 1 is a schematic overall view of an environmental experiment chamber temperature measuring device;
FIG. 2 is a side view of the temperature measuring device of the environmental experiment chamber;
FIG. 3 is a front view of the temperature measuring device of the environmental experiment chamber;
FIG. 4 is a top view of the temperature measuring device of the environmental experiment chamber;
FIG. 5 is an assembly view of a vertical screw rod in the temperature measuring device of the environmental experiment chamber;
FIG. 6 is a horizontal guide rail diagram of the temperature measuring device of the environmental experiment chamber;
FIG. 7 is a schematic view of the top structure of the temperature measuring device of the environmental experiment chamber;
FIG. 8 is a schematic diagram of a top moving device in the temperature measuring device of the environmental experiment chamber;
FIG. 9 is a schematic view of a support beam structure of the temperature measuring device of the environmental experiment chamber;
FIG. 10 is a schematic view of the movable rod assembly of the temperature measuring device of the environmental chamber;
FIG. 11 is a vertical screw rod diagram of the temperature measuring device of the environmental experiment chamber;
FIG. 12 is a front view of a solid chamber of the temperature measuring device of the environmental experiment chamber;
FIG. 13 is a side view of the solid chamber of the temperature measuring device of the environmental experiment chamber;
FIG. 14 is a schematic view of the temperature curve of the present invention.
In the figure: 1. a horizontal driving motor; 2. a support beam; 3. a top beam; 4. a top drive motor; 5. a horizontal guide rail; 6. a travel bar; 7. a baffle slot; 8. a top cover; 9. a moving motor; 10. a ground surface; 11. a horizontal lead screw; 12. a top rail; 13. a slide rail; 14. a vertical lead screw; 15. a slider; 16. a guide rail seat; 17. a limiting block; 18. a roller; 19. a telescopic motor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example one
The method for judging the temperature uniformity of the environmental experiment chamber comprises the following steps:
determining that the number of positions for measuring the temperature data of the temperature measuring device in the horizontal direction and the vertical direction is 1, and the number of measuring points of each position is 5 multiplied by 5 to form a matrix, and taking the target temperature of 40 ℃ for loading as an example;
TABLE 1
Please refer to table 1, wherein the total T of the temperature data of all the test points at the test position is 969.9
Sum of squares of first test site temperature data:
a sum of squares of the first test location temperature data sum;
the square of the sum of all temperature data at the first test location;
T2＝940706.01；
sum of squared deviations Δ of all test data for the first test positionGeneral of：
Sum of squared deviations Δ between test data at first test siteBetween groups：
Sum of squared deviations Δ within the first test site test dataIn group：
ΔIn group＝ΔGeneral of-ΔBetween groups＝4.6096-0.7256＝3.884；
Degree of freedom of the sum of squared deviations of the first test position:
first test location mean square sum:
value of the first test location rejection field:
selecting alpha as 0.05, F0.95(4，20)＝2.25；
The temperature test values of all points are better in consistency because 0.934 is less than 2.25; similarly, the calculation and evaluation of the superposition of multiple positions can be performed, and only one set of data is provided;
when the temperature consistency is judged, the data index evaluation is started, two indexes of the range difference and the deviation can be calculated through the first test position data, the range difference gamma is 1.5 ℃ to less than 4 ℃, the deviation (maximum value) kappa is 1.9 ℃ to less than 2 ℃, and both the range difference gamma and the deviation meet the specified limit requirements, as shown in fig. 14, the fluctuation degree theta is 39.3-39.1 to 0.2 ℃, and theta is 0.2 ℃ to less than 0.5 ℃ when the test data fluctuation condition is within 5 minutes of the temperature of a certain test point, the requirement is met, the result is normal, and the requirement is met, otherwise, the result is not met.
Example two
Referring to fig. 1 to 11, the temperature measuring device of the environmental experiment chamber refers to fig. 1, wherein X is a first direction, Y is a second direction, and Z is a third direction; the device comprises a moving rod 6 capable of mounting a plurality of temperature sensors, a telescopic rod capable of mounting a plurality of temperature sensors and a horizontal moving device arranged along a first direction X; the horizontal moving devices are connected with supporting beams 2 arranged along a third direction Z, and the supporting beams 2 are connected with top beams 3 arranged along a second direction Y; the top beam 3 is provided with a lifting device, the movable rod 6 is arranged along the second direction Y, is connected to the lifting device and can move along the third direction Z under the driving of the lifting device, and the movable rod 6 is provided with a plurality of mounting holes for mounting a temperature sensor; a top guide rail 12 and a slide rail 13 are arranged on the top beam 3 along the second direction Y, a guide rail seat 16 is arranged on the top guide rail 12, a top cover 8 is connected on the guide rail seat 16, the upper end surface of the top cover 8 is connected with a sliding device capable of moving along the second direction Y, and the lower end surface of the top cover 8 is connected with a telescopic motor 19; a plurality of temperature sensors are arranged on a telescopic rod of the telescopic motor 19; the telescopic rods are arranged along the third direction Z and can be driven by a telescopic motor 19 to be telescopic, and the telescopic rods are movably arranged on the top beam 3 through a sliding device and can be driven by the sliding device to move back and forth on the top beam 3 along the second direction Y; the horizontal moving device can drive the supporting beam 2, the lifting device and the top beam 3 to move along the first direction X, so as to drive the moving rod 6 and the telescopic rod to move synchronously, the moving rod 6 can move along the third direction Z under the driving of the lifting device while moving along the first direction X, and the telescopic rod can also move along the third direction Z under the driving of the telescopic motor 19; and the moving bar 6 itself is arranged along the second direction Y, while the telescopic bar is movable along the second direction Y driven by the sliding means.
The horizontal moving device can be controlled by a worker through the control system to drive the supporting beam 2 and the top beam 3 to horizontally move along the first direction X, so that the moving rod 6 and the telescopic rod also move along the first direction X, the temperature sensors on the moving rod 6 and the telescopic rod start to measure the temperature of the current position in real time at the moment, a plurality of temperature sensors are arranged on the moving rod 6 along the second direction Y, and the sliding device can drive the telescopic rod to move along the second direction Y; the movable rod 6 is driven by the lifting device to move in the third direction Z, the telescopic rod can also move in the third direction Z under the driving of the telescopic motor 19, the moving tracks of the movable rod 6 and the telescopic rod are mutually staggered, measuring points of the temperature sensor are distributed mainly in the first direction X, the second direction Y and the third direction Z, and the positions of the measuring points are distributed in the vertical direction and the horizontal direction, so that the measuring points of the temperature measuring device are more diversified and multidimensional, and the detection result is more accurate and efficient.
Preferably, as shown in fig. 1 and 2, the horizontal moving device comprises a horizontal driving motor 1 symmetrically installed on the ground 10, and a horizontal lead screw 11 is connected to an output end of the horizontal driving motor 1; horizontal guide rails 5 are arranged on two sides of the horizontal screw rod 11, a guide rail seat 16 is arranged on each horizontal guide rail 5, and the guide rail seat 16 is in threaded connection with the bottom of the support beam 2 through bolts; the two axial ends of the horizontal guide rail 5 are provided with limit blocks 17.
The horizontal lead screw 11 is connected with the horizontal driving motor 1 through a flange plate, the horizontal driving motor 1 is fixed on the ground 10, and the horizontal lead screw 11 only rotates and does not translate; the horizontal driving motor 1 is connected with an external control system, is controlled in a displacement mode, can rotate forwards or backwards, drives the whole device to move forwards when rotating forwards, and drives the whole device to move backwards when rotating backwards; wherein the horizontal guide rail 5 is arranged on the solid and ground 10, and the horizontal guide rail 5 is arranged close to the wall of the environmental experiment chamber.
Preferably, as shown in fig. 1, 3, 5, and 10, the lifting device includes a top driving motor 4 mounted on the top beam 3, an output end of the top driving motor 4 is connected with a vertical lead screw 14, an axial end of the vertical lead screw 14 extends into the support beam 2, a liftable sliding block 15 is disposed on the vertical lead screw 14, and a moving rod 6 is disposed on the sliding block 15.
As shown in fig. 1, 6 and 9, a threaded hole with a hole diameter of 68mm is formed in the bottom of the support beam 2 in the longitudinal direction, a horizontal lead screw 11 is installed in the threaded hole, and the length of the horizontal lead screw 11 is greater than that of the threaded hole; a through hole with the aperture of 50mm is formed in the center of the top of the supporting beam 2, the vertical lead screw 14 is vertically placed through the through hole, and a circular groove with the aperture of 50mm is formed in the center of the bottom of the supporting beam 2 and used for limiting the vertical lead screw 14 to only rotate; the top of the vertical screw 14 is connected with the top driving motor 4 through a flange plate, and the top driving motor 4 is fixed at the top of the support beam 2 and is vertically arranged; the top driving motor 4 may rotate in a forward or reverse direction to drive the vertical screw 14 to rotate, so that the sliding block 15 can be lifted on the vertical screw 14, thereby achieving the up-and-down movement of the moving rod 6.
Preferably, as shown in fig. 1, 2 and 5, a baffle slot 7 matched with a vertical screw 14 is arranged in the support beam 2, and a sliding block 15 is connected to the inner wall of the baffle slot 7 in a sliding manner; one side of the sliding block 15 is provided with a circular groove, and a moving rod 6 is arranged in the circular groove; the two axial ends of the movable rod 6 are of spring telescopic structures, and a thermal resistance type temperature sensor is arranged in a mounting hole of the movable rod 6.
The center of the sliding block 15 is provided with a threaded hole with the aperture of 50mm, the sliding block 15 is arranged on the vertical screw rod 14, the sliding block 15 is matched with the baffle groove 7, and the movement in the vertical direction is realized through the groove on the baffle groove 7; wherein the baffle slots 7 are arranged on the support beam 2 through bolts, the baffle slots 7 on two sides are symmetrically arranged, and the side wall of each baffle slot 7 is provided with a vertical groove; the two ends of the movable rod 6 adopt a spring telescopic structure, so that the movable rod can be conveniently installed in the sliding blocks 15 on the two sides, and the hole diameter of the installation hole is larger than that of the thermal resistance type temperature sensor.
Preferably, as shown in fig. 1 and 8, the sliding device includes a moving motor 9 mounted on the upper end surface of the top cover 8, an output end of the moving motor 9 is provided with a main gear, a pinion is engaged with the main gear, a rod body is fixed in the pinion, two axial ends of the rod body are movably connected with rollers 18, and the rollers 18 are slidably connected in the sliding rails.
When the moving motor 9 is in operation, the main gear is driven to operate, the pinion is driven to rotate by the main gear, and when the pinion rotates, the rod body and the roller 18 are synchronously driven to move in the slide rail; when the moving motor 9 drives the two side rollers 18 to move along the sliding rails 13, the top cover 8 can realize reciprocating motion on the top guide rail 12.
Preferably, as shown in fig. 1, 6 and 7, the top guide rail 12 is installed inside the top beam 3, and the slide rail 13 is installed outside the top beam 3; the top rail 12 is terminated at each end by a stop block 17.
By arranging the limiting block 17, the roller 18 can be prevented from slipping.
EXAMPLE III
Referring to fig. 12 to fig. 13, the operation method of the present embodiment based on the second embodiment is as follows:
when in the empty cabin working condition: s1, controlling the two horizontal driving motors 1 to operate simultaneously, and moving the whole device to one side of the environmental chamber, wherein the position is the initial position;
s2, when the horizontal driving motor 1 runs, the top driving motor 4 also starts to run synchronously, so that the moving rod 6 moves downwards, a worker installs the temperature sensor in the hole, and then the top driving motor 4 runs reversely to lift the moving rod 6 to the top position;
s3, setting temperature values, starting loading, monitoring the temperature conditions of the measuring points in real time, and when the temperature values of the measuring points continuously change for 30min and do not exceed 0.5 ℃, determining that the temperature is stable, recording a first group of data by the computer, and inputting the first group of data into the table;
s4, according to actual requirements, a worker equally divides n in the vertical direction, then sets a displacement value (a/n) × 2, controls the top driving motor 4, moves the movable rod 6 to a second position, stands for 5min, and records a second group of data;
s5, repeating the operation of S4, and respectively obtaining temperature data of the measuring point at the third, fourth and x-th positions;
s6, equally dividing the horizontal direction m, setting the displacement value (b/n) × 2, controlling the horizontal driving motor 1 to move the device to the second position, repeating the operations of S4 and S5, and finally forming a complete temperature data table.
Working conditions of the real cabin: s1, placing the test prototype at the designated position of the environmental test chamber;
s2, controlling the two horizontal driving motors 1 to operate simultaneously, and moving the whole device to one side of the environmental chamber, wherein the position is an initial position;
s3, calculating the space distances between the test prototype and the front, the rear, the left, the right and the upper parts of the environment cabin, and respectively determining the positions and the number of temperature measuring points according to the space sizes;
s4, controlling the two top driving motors 4 to rotate simultaneously to enable the moving rod 6 to descend, installing a temperature sensor on the moving rod 6 by a worker, then controlling the top driving motors 4 to run reversely to drive the moving rod 6 to ascend to the top position, and extending the telescopic rods of the telescopic motors 19 outwards;
s5, setting temperature values, starting loading, monitoring the temperature conditions of the measuring points, and considering that the temperature is stable when the temperature value of each measuring point changes for 30min continuously and does not exceed 0.5 ℃;
s6, for a test prototype and a test chamber A, B, C area, wherein a A, B area is a front edge and a rear edge of the test prototype and an environment chamber area, a C area is a top of the test prototype and an environment chamber area, the temperature sensor on the movable rod 6 is used for measuring, for the test prototype and the environment chamber D, E area, the D, E area is a left side edge and a right side edge of the test prototype and the environment chamber area, the height is the height of the test prototype, and the telescopic rod temperature sensor is controlled by the telescopic motor 19 for measuring;
s7, controlling the horizontal driving motor 1 to operate to enable the device to be located at different measuring positions, controlling the top driving motor 4, adjusting the moving rod 6 to different heights, controlling the moving motor 9 to drive the sliding device to different left and right set positions of the test sample machine, synchronously measuring temperature data of all positions, and recording;
s8, when the top sliding device crosses the test sample machine, the telescopic motor 19 retracts the telescopic rod to avoid collision with the test sample machine;
s9, after the measurement, forming a plurality of temperature data tables of A, B, C, D and E areas, respectively, and recording the temperature data tables in the tables.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The method for judging the temperature uniformity of the environmental experiment chamber is characterized by comprising the following steps: the method comprises the following steps:
determining the number n of temperature measuring points in the vertical direction and the number m of temperature measuring points in the horizontal direction of the test position;
measuring according to the determined n and m;
acquiring temperature data of the measuring points to form an n x m-order temperature test matrix;
calculating the sum T of the temperature data of all the measuring points at the test positionnThe sum T of the temperature data of all the measuring points, and the square sum delta of the deviations of the temperature data of all the measuring pointsGeneral ofSum of squared deviations Δ between the data of all the test positionsBetween groups、
Sum of squared deviations Δ within the test position dataIn group(ii) a Determining the degree of freedom and the mean square sum of each dispersion square sum of the test positions; calculating a rejection area F of the test position;
comparing the rejection region F with a critical value in an F distribution table;
calculating a range gamma, a deviation kappa and a fluctuation degree theta in response to the rejection region F being smaller than a critical value in an F distribution table;
comparing the range gamma with a range threshold, the deviation kappa with a deviation threshold, and the fluctuation theta with a fluctuation threshold to obtain a comparison result;
and obtaining a temperature uniformity judgment result of the environmental experiment chamber according to the comparison result.
2. The environmental laboratory chamber temperature uniformity determination method according to claim 1, wherein: t of temperature data of all measuring pointsnAnd the sum T of the temperature data of all the measuring points is calculated according to the following formula:
wherein said T isnmThe temperature value of the nth row and the mth column in the matrix is shown.
3. The environmental laboratory chamber temperature uniformity determination method according to claim 2, wherein: the square sum of the test position temperature data, the square sum of the test position temperature data sum and the square of the temperature data sum are calculated according to the following formula:
wherein said T isijRepresenting the test value of the ith row and the jth column in the temperature test matrix;
the T isiRepresenting the sum of the temperature data of each row in the temperature test matrix;
the T represents the sum of all data of the temperature test matrix;
sum of squared deviations Δ of all test data for the test siteGeneral ofThe calculation formula is as follows:
said ΔGeneral ofRepresenting the sum of squared deviations of the data population;
sum of squared deviations Δ between the test position dataBetween groupsThe calculation formula is as follows:
said ΔBetween groupsRepresenting the sum of squares of the differences between each group of data;
sum of squared deviations Δ within the test position test dataIn groupThe calculation formula is as follows:
Δin group＝ΔGeneral of-ΔBetween groups；
The degree of freedom of each dispersion square sum of the test positions is calculated by the following formula:
the critical value of the test position is F1-α(dfA，dfe) The value of the alpha is 0.01 or 0.05;
the mean square sum is calculated by the formula:
the calculation formula of the F value is as follows:
4. the environmental laboratory chamber temperature uniformity determination method according to claim 1, wherein: the calculation method of the range gamma comprises the following steps:
γ＝Tmax-Tmin；
the T ismaxThe maximum temperature value of the measuring point is obtained;
the T isminThe minimum temperature value of the measuring point is obtained;
the deviation κ is calculated as:
κ＝|Ttarget value-Tnm|；
The T isTarget valueIs a target temperature value;
the calculation method of the fluctuation degree theta comprises the following steps:
θ＝Tmaximum amplitude-TMinimum amplitude；
The T isMaximum amplitudeThe maximum value of the temperature fluctuation of a certain measuring point is obtained;
the T isMinimum amplitudeThe minimum value of the temperature fluctuation of a certain measuring point is obtained;
further, according to the comparison result, obtaining an environment experiment chamber temperature uniformity judgment result, comprising:
and the range gamma does not exceed a range threshold, the deviation kappa does not exceed a deviation threshold, and the fluctuation theta does not exceed a fluctuation threshold, and the environment experiment chamber temperature uniformity is judged to meet the requirement.
5. Environmental experiment cabin temperature measuring device, its characterized in that: the device comprises a movable rod, a telescopic rod and a horizontal moving device, wherein the movable rod can be provided with a plurality of temperature sensors; the horizontal moving device is connected with a supporting beam arranged along a third direction, and the supporting beam is connected with a top beam arranged along a second direction; the top beam is provided with a lifting device, the moving rod is arranged along a second direction, is connected to the lifting device and can move along a third direction under the driving of the lifting device, the telescopic rod is arranged along the third direction and can be telescopic under the driving of a telescopic motor, the telescopic rod is movably arranged on the top beam through a sliding device and can move back and forth on the top beam along the second direction under the driving of the sliding device; the horizontal moving device can drive the supporting beam, the lifting device and the top beam to move along a first direction, so that the moving rod and the telescopic rod are driven to move synchronously.
6. The environmental laboratory module temperature measuring device of claim 5, wherein: the horizontal moving device comprises horizontal driving motors symmetrically arranged on the ground, and the output ends of the horizontal driving motors are connected with horizontal lead screws; horizontal guide rails are arranged on two sides of the horizontal screw rod, guide rail seats are arranged on the horizontal guide rails, and the guide rail seats are in threaded connection with the bottoms of the supporting beams through bolts; and two axial ends of the horizontal guide rail are provided with limiting blocks.
7. The environmental laboratory module temperature measuring device of claim 5, wherein: the lifting device comprises a top driving motor installed on the top beam, the output end of the top driving motor is connected with a vertical lead screw, one axial end of the vertical lead screw extends into the supporting beam, a liftable sliding block is arranged on the vertical lead screw, and the moving rod is arranged on the sliding block.
8. The environmental laboratory module temperature measuring device of claim 7, wherein: a baffle groove matched with the vertical screw rod is arranged in the support beam, and the inner wall of the baffle groove is connected with the sliding block in a sliding manner; a circular groove is formed in one side of the sliding block, and the moving rod is installed in the circular groove; the two axial ends of the moving rod are of spring telescopic structures, and a thermal resistance type temperature sensor is arranged in the mounting hole of the moving rod.
9. The environmental laboratory module temperature measuring device of claim 5, wherein: the sliding device comprises a movable motor arranged on the upper end surface of the top cover, the output end of the movable motor is provided with a main gear, an auxiliary gear is meshed with the main gear, a rod body is fixed in the auxiliary gear, two axial ends of the rod body are movably connected with rollers, and the rollers are connected in the sliding rail in a sliding manner; the sliding rail is arranged on the outer side of the top beam; the top guide rail is installed the inboard of back timber, the stopper is all installed at the both ends of top guide rail.
10. The environmental laboratory module temperature measuring device of claim 5, wherein: the first direction, the second direction and the third direction are mutually perpendicular in pairs, the third direction is a vertical direction, and the first direction and the second direction are mutually perpendicular on a horizontal plane.
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