CN111289206B - Ice shape measurement auxiliary device and method - Google Patents
Ice shape measurement auxiliary device and method Download PDFInfo
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- CN111289206B CN111289206B CN202010348821.XA CN202010348821A CN111289206B CN 111289206 B CN111289206 B CN 111289206B CN 202010348821 A CN202010348821 A CN 202010348821A CN 111289206 B CN111289206 B CN 111289206B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
Abstract
The invention is suitable for the technical field of ice shape measurement of icing wind tunnel icing tests, and provides an ice shape measurement auxiliary device, which comprises: the main frame is distributed along the vertical direction on the whole; a hot knife frame assembly vertically movable along the main frame; a position measurement assembly for measuring a position of the hot knife frame assembly on the main frame; the hot knife frame assembly comprises a main frame piece and an auxiliary frame piece, wherein the main frame piece is connected with the auxiliary frame piece in a sliding mode, and the auxiliary frame piece can horizontally move along the main frame piece. In the ice shape measurement auxiliary device, the position of the hot knife frame assembly on the main frame is adjustable, so that the ice shape measurement auxiliary device can be suitable for different models, and the defect that a new auxiliary measurement device needs to be redesigned in the prior art is overcome, so that the ice shape measurement auxiliary device has good adaptability to the models.
Description
Technical Field
The invention belongs to the technical field of ice shape measurement of an icing wind tunnel icing test, and particularly relates to an auxiliary device and method for ice shape measurement.
Background
The icing wind tunnel test comprises an icing test and an anti-icing technology verification test, the icing wind tunnel mainly takes the icing test as a main part, the icing test simulates a real flight environment easy to ice, so that the surface of the airplane model is iced, the formed ice shape is measured, the ice shape is digitalized, and reliable data is provided for relevant research and analysis.
The most common ice shape measuring method at present is a hot knife method, and the basic principle of the hot knife method is as follows: firstly, using a hot knife to perform vertical spreading cutting at a plurality of preset marked positions of an ice-carrying model, wherein the hot knife usually adopts a heating metal sheet consistent with a notch of the model appearance; after the hot knife is used for vertical unfolding cutting, the ice model is provided with uniform cut gaps, and then a drawing board and coordinate paper are inserted, wherein the drawing board and the coordinate paper are provided with gaps with the same shapes as the model; drawing an icing contour outline on the coordinate paper by using a pencil, wherein the icing contour outline is an ice shape which is an ice shape of a two-dimensional plane at the position of the mark; and scanning the ice shapes, inputting the ice shapes into a computer, and finally obtaining two-dimensional coordinate data for subsequent research and analysis.
It can be seen from the basic principle of the hot knife method that to obtain the ice shape with the predetermined mark position of the ice model, the mark position needs to be accurately found, and the accuracy of the mark position affects the quality of the measured ice shape.
In order to find the mark position, the following two methods are mainly adopted in the prior art:
the first mode is as follows: the icy ice-shaped measurement support frame disclosed in patent CN208333802U comprises a support base and a support rod arranged on the support base, wherein a horizontal support frame capable of sliding up and down is arranged on the support rod, a locking end capable of adjusting height up and down is arranged at the top end of the support rod, and the support frame can be moved and placed at any position in a wind tunnel; the method mainly depends on manual adjustment to find the marking position on the ice-carrying model, and the horizontal support frame is manually adjusted to align with the marking position of the ice-carrying model by visual inspection of the graduated scale according to the graduated scale on the support rod as a reference; after the model is frozen, the marking position is difficult to identify due to ice coating, the marking position can be estimated only by the graduated scale, certain error exists in the obtained position, and after the device measures the ice shape of one marking position, the device is completely manually adjusted to the next marking position by manpower, so that the working efficiency is low;
the second mode is as follows: as shown in fig. 1, the auxiliary measuring device has a plurality of horizontal support frames, and the distance between the horizontal support frames is customized according to the mark position of the model, so the measuring efficiency of the auxiliary measuring device is high for the same model, but if the model is changed, a new auxiliary measuring device needs to be designed again, and therefore the adaptability of the auxiliary measuring device to different models is poor.
Therefore, it is necessary to invent an ice shape measurement assisting device having high measurement efficiency, high measurement accuracy, and good adaptability to a model.
Disclosure of Invention
The invention aims to provide an ice shape measurement auxiliary device and method, and aims to solve the technical problems of low measurement efficiency, low measurement precision and poor adaptability to models in the prior art.
The invention is realized in such a way that an ice shape measurement auxiliary device comprises: the main frame is distributed along the vertical direction on the whole; a hot knife frame assembly vertically movable along the main frame; a position measurement assembly for measuring a position of the hot knife frame assembly on the main frame; the hot knife frame assembly comprises a main frame piece and an auxiliary frame piece, wherein the main frame piece is connected with the auxiliary frame piece in a sliding mode, and the auxiliary frame piece can horizontally move along the main frame piece.
Further, the position measurement assembly comprises a grating reading head and a grating ruler, wherein the grating reading head is installed on the main frame piece, and the grating ruler is installed on the main frame.
Further, the main frame comprises a base and a frame, and the base is fixedly connected with the frame; the frame is a non-closed hollow cylinder, and a vertical guide rail is arranged on a vertical frame of the frame.
Furthermore, a vertical sliding block is arranged on the main frame piece and is in sliding connection with the vertical guide rail.
Furthermore, a horizontal proximity switch is further arranged on the main frame piece, and a vertical proximity switch is further arranged on the main frame.
Furthermore, a horizontal sliding rail is further arranged on the main frame piece, a horizontal sliding block is arranged on the auxiliary frame piece, and the main frame piece and the auxiliary frame piece are connected in a sliding mode through the horizontal sliding rail and the horizontal sliding block.
Further, the lifting driving assembly is used for driving the hot knife frame assembly to vertically move along the main frame; the lifting driving assembly comprises a vertical motor, a vertical lead screw and a vertical nut, the vertical motor is fixedly installed on the main frame, and the vertical motor drives the vertical lead screw to rotate so as to drive the vertical nut to vertically move; the main frame piece is fixedly connected to the vertical nut.
Further, the horizontal driving component is used for driving the auxiliary frame piece to horizontally move along the main frame piece; the horizontal driving assembly comprises a horizontal motor, a horizontal lead screw and a horizontal nut, the horizontal motor is fixedly arranged on the main frame piece, and the horizontal motor drives the horizontal lead screw to rotate so as to drive the horizontal nut to horizontally move; the auxiliary frame piece is fixedly connected to the horizontal nut.
The controller is used for receiving and processing a control command, converting the control command into a motor driving signal and transmitting the motor driving signal to the motor driver.
The invention also provides a method for measuring the ice shape by using the auxiliary device for measuring the ice shape, which comprises the following steps:
installing an ice-shaped measurement auxiliary device;
before the model is frozen, measuring a reference position of the ice shape measurement auxiliary device corresponding to the mark position of the model;
inputting a reference position after the model is frozen, automatically moving the main frame part to the reference position, and automatically extending the auxiliary frame part; placing the heated notch metal sheet on the auxiliary frame piece, pushing the notch metal sheet towards the ice-carrying model to obtain a notch gap, and then drawing back the notch metal sheet; and (4) clamping the drawing board pasted with the coordinate paper into the notch, and drawing the ice shape at the marked position on the coordinate paper.
Compared with the prior art, the invention has the technical effects that:
1. in the ice-shape measuring auxiliary device of the present invention, the position of the hot knife frame assembly on the main frame can be accurately measured by the position measuring assembly, and the number of pulses is fed back in the position controlP f The ice shape measurement auxiliary device has the advantages that the ice shape measurement auxiliary device is fed back to the vertical motor through the motor driver, and the vertical motor can enable the hot knife frame assembly to reach an accurate position;
2. the ice shape measurement auxiliary device has a manual mode and an automatic mode, and can be selected, when a reference position is measured, the manual mode is selected, and the reference position is obtained through measurement; when the ice shape is measured, the automatic mode is selected, and the main frame member automatically moves to the reference position, so that the ice shape measurement auxiliary device has high measurement efficiency; and when the ice shape is measured, the target position of the main frame part is based on the reference position obtained by measurement, rather than the graduated scale in the traditional mode, the final position of the main frame part is higher in precision.
3. In the ice shape measurement auxiliary device, the position of the hot knife frame assembly on the main frame is adjustable, so that the ice shape measurement auxiliary device can be suitable for different models, and the defect that a new auxiliary measurement device needs to be redesigned in the second mode in the background art is overcome, so that the ice shape measurement auxiliary device has good adaptability to the models.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a prior art ice measurement aid;
FIG. 2 is a schematic diagram of the ice measurement aid of the present invention;
FIG. 3 is a schematic structural view of the hot knife frame assembly of the present invention;
FIG. 4 is a schematic structural view of the lift drive assembly of the present invention;
FIG. 5 is another schematic structural view of the ice measurement aid of the present invention;
FIG. 6 is a control flow diagram of the ice measurement aid of the present invention;
FIG. 7 is a schematic diagram of the present invention for finding a marker position X;
fig. 8 is a schematic view of the notched sheet metal of the present invention coinciding with the mark position X.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that when an element is referred to as being "fixed" or "disposed" to another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 2, the ice shape measurement assisting device of the present invention includes: a main frame 10, the main frame 10 being distributed in a vertical direction as a whole;
a hot knife frame assembly 20, the hot knife frame assembly 20 being vertically movable along the main frame 10;
a position measuring assembly 30, the position measuring assembly 30 being used for measuring the position of the hot knife frame assembly 20 on the main frame 10;
the hot knife frame assembly 20 comprises a main frame member 21 and a sub frame member 22, wherein the main frame member 21 is slidably connected with the sub frame member 22, and the sub frame member 22 can horizontally move along the main frame member 21.
The position measuring assembly 30 includes a grating reading head 31 and a grating ruler 32, wherein the grating reading head 31 is mounted on the main frame 21, and the grating ruler 32 is mounted on the main frame 10.
As the main frame member 21 moves in the vertical direction, the grating reading head 31 also moves in the vertical direction, and therefore, positional information of the main frame member 21 can be obtained by the position measurement assembly 30.
Further, the main frame 10 includes a base 11 and a frame 12, and the base 11 and the frame 12 are fixedly connected; the frame 12 is a non-closed hollow cylinder, and a vertical guide rail 13 is arranged on a vertical frame 121 of the frame 12.
Preferably, the frame 12 is a semicircular hollow cylinder, and the grating ruler 32 is fixed at the center position of the inner wall of the frame 12. The base 11 and the frame 12 may be fixedly connected by welding or the like.
Further, in order to realize the installation of the ice shape measurement auxiliary device in the icing wind tunnel, a certain number of threaded holes are formed in the base 11 and used for installing the base 11 on the lower wall surface of the icing wind tunnel through bolts so as to realize the installation of the lower end of the whole ice shape measurement auxiliary device.
As shown in fig. 3, which is a schematic structural diagram of the hot knife frame assembly of the present invention, further, a vertical slider 211 is disposed on the main frame member 21, and the vertical slider 211 is slidably connected to the vertical guide rail 13.
Preferably, there are two vertical sliders 211 and two vertical guide rails 13 to smoothly guide the main frame member 21.
Further, a horizontal proximity switch 212 is disposed on the main frame member 21, and the horizontal proximity switch 212 is used as a mechanical zero position in the horizontal direction; the main frame is further provided with a vertical proximity switch 122, and the vertical proximity switch 122 is used as a mechanical zero position in the vertical direction.
The main frame 21 is located below the sub-frame 22, so that the main frame 21 supports the sub-frame 22, specifically, the main frame 21 is further provided with a horizontal slide rail 213, the sub-frame 22 is provided with a horizontal slide block 214, and the main frame 21 and the sub-frame 22 are slidably connected through the horizontal slide rail 213 and the horizontal slide block 214.
Preferably, there are two horizontal sliding rails 213 and two horizontal sliding blocks 214 to smoothly guide the sub-frame 22.
At the time of measurement, the hot knife is placed on the sub-frame member 22 so that the sub-frame member 22 provides support for the hot knife.
Fig. 4 is a schematic structural diagram of the lifting driving assembly of the present invention. In order to realize that the hot knife frame assembly 20 vertically moves along the main frame 10, the ice-shaped measurement auxiliary device further comprises a lifting driving assembly 40, wherein the lifting driving assembly 40 comprises a vertical motor 41, a vertical lead screw 42 and a vertical nut 43, the vertical motor 41 is fixedly installed on the main frame 10, specifically, the vertical motor 41 is installed in the base 11, and the vertical motor 41 is connected with the lower end of the vertical lead screw 42 through a coupler;
fig. 5 is another schematic structural diagram of the ice-shape measurement assisting device according to the present invention. The upper end of the vertical screw 42 is mounted in a first support 44, the vertical screw 42 can rotate in the first support 44, a first connecting plate 45 is fixed on the first support 44, when the ice shape measurement auxiliary device is arranged in an icing wind tunnel, a second connecting plate 46 is fixed on the upper wall surface of the icing wind tunnel, and the first connecting plate 45 is connected with the second connecting plate 46, so that the upper end mounting of the whole ice shape measurement auxiliary device is realized. Specifically, corresponding threaded holes may be provided in the first connecting plate 45 and the second connecting plate 46, and the first connecting plate and the second connecting plate may be detachably connected by bolts.
Preferably, the second connecting plate 46 is L-shaped, and the second connecting plate 46 includes a horizontal connecting plate 461 and a vertical connecting plate 462, the horizontal connecting plate 461 is used for being fixed to the upper wall surface of the icing wind tunnel, and the vertical connecting plate 462 is used for being connected to the first connecting plate 45. During the wind tunnel test, if the ice shape measurement auxiliary device is located in the icing wind tunnel, the wind tunnel flow field is damaged, and during the test, the ice shape measurement auxiliary device is expected not to exist in the icing wind tunnel, so the connection between the horizontal connecting plate 461 and the upper wall surface of the icing wind tunnel is preferably detachable.
The vertical motor 41 drives the vertical screw rod 42 to rotate, and then drives the vertical nut 43 to vertically move; the main frame member 21 is fixedly coupled to the vertical nut 43, and thus, the vertical movement of the main frame member 21 can be achieved.
The ice shape measurement auxiliary device further comprises a controller and a motor driver, wherein the controller and the motor driver are mutually connected, the motor driver is connected with the vertical motor 41, and the controller is used for receiving and processing a control command, simultaneously converting the control command into a motor driving signal and transmitting the motor driving signal to the motor driver. Meanwhile, the vertical motor 41 of the present invention is provided with an encoder.
Specifically, the control terminal 60 may send an instruction to the controller, and the control terminal may be a touch screen control terminal or a key control terminal, and preferably, the control terminal is a touch screen control terminal to have both functions of sending a control instruction and displaying an operation state of the apparatus; the controller is preferably a PLC controller. Preferably, the controller and the motor driver are simultaneously placed in the control box 70.
The controller simultaneously receives the position information of the main frame 21 relative to the grating scale 32 acquired by the grating reading head 31.
Specifically, the position control principle of the ice-shape measurement assisting device of the present invention is as follows:
according to the lead of the vertical lead screw 42S(i.e., the distance the vertical nut 43 moves when the vertical lead screw 42 rotates one revolution), and the resolution of the encoder carried by the vertical motor 41 itselfP E And pulse multiplication factor of motor driverP A For convenience of description, the pulse signal sent by the motor driver to the vertical motor is referred to as a motor pulse signal. According toS、P E 、P A The moving distance of the vertical nut corresponding to the pulse signal of the single motor can be obtainedL S,P ：
For convenience of description, the pulses generated by the grating scale are referred to herein as grating pulse signals. According to the resolution P of the grating rulerGAnd the length D of the grating ruler, and obtaining the moving distance of the grating reading head corresponding to the single grating pulse signalL G,P ：
L G,P I.e. the moving distance of the hot knife frame corresponding to the single raster pulse signal.
The hot knife frame moves a certain distanceLThe grating ruler generates the pulse number of the grating pulse signal asP g According toP g 、L G,P 、 L S,P ，The controller calculates the number of feedback pulsesP f And feeds back the number of pulsesP f The position of the vertical motor is further adjusted by feeding back the motor driver to the vertical motor, and particularly,P f the values are calculated as follows:
wherein the content of the first and second substances,P f the values have positive and negative magnitudes, and the symbols represent directions.
The position control of the invention belongs to a closed-loop control mode, and simultaneously, the grating ruler and the vertical screw rod of the invention both belong to precise devices, and the precision can reach micron-scale, so that the high-precision positioning of the hot knife frame can be realized.
Further, in order to drive the auxiliary frame member 22 to horizontally move along the main frame member 21, the ice-shape measurement auxiliary device of the present invention further comprises a horizontal driving assembly 50, wherein the horizontal driving assembly 50 comprises a horizontal motor 51, a horizontal lead screw 52 and a horizontal nut 53, the horizontal motor 51 is fixedly mounted on the main frame member 21, and the horizontal motor 51 is connected with the rear end of the horizontal lead screw 52 through a coupling; a second supporting part 54 is fixed at the middle position of the main frame part 21, the rear end of the horizontal screw 52 is installed in the second supporting part 54, and the rear end of the horizontal screw 52 can rotate in the second supporting part 54;
the horizontal motor 51 drives the horizontal screw 52 to rotate, and further drives the horizontal nut 53 to move horizontally; the sub-frame member 22 is fixedly coupled to the horizontal nut 53.
The sub-frame 22 is a U-shaped structure with a gap, and the gap of the sub-frame 22 faces the model during measurement.
In order to efficiently realize ice shape measurement, the ice shape measurement auxiliary device of the invention has two control modes, as shown in fig. 6, which is a control flow chart of the ice shape measurement auxiliary device of the invention, a control terminal and a controller are initialized firstly, and then an automatic mode or a manual mode is selected through the control terminal;
when the manual mode is selected, the device zeroing is performed first, and then the reference position is measured by the vertical movement of the main frame member 21, the horizontal movement of the sub frame member 22, and the like.
When the automatic mode is selected, the main frame member 21 is automatically moved to the reference position and then the sub frame member 22 is horizontally moved again when the control terminal inputs the reference position measured in the manual mode.
The invention also provides a method for measuring ice shape by using the device, which specifically comprises the following steps:
first, an ice measurement aid is installed.
Specifically, a second connecting plate 46 is fixed on the upper wall surface U of the icing wind tunnel, and the first connecting plate 45 is connected with the second connecting plate 46, so that the upper end of the whole ice-shaped measurement auxiliary device is mounted;
the base 11 is installed on the lower wall surface D of the icing wind tunnel through bolts so as to realize the installation of the lower end of the whole ice shape measurement auxiliary device;
when the model is installed, the gap of the auxiliary frame 22 faces the windward end of the model;
in the initial state (i.e., the ice-uncut state), the sub-frame member 22 maintains the retracted state.
Next, before the model is frozen, a reference position of the ice measurement assisting device corresponding to the mark position of the model is measured.
As shown in fig. 7, it is a schematic diagram of finding the mark position X, specifically, after the ice shape measurement auxiliary device is installed, the control terminal selects a manual mode, the ice shape measurement auxiliary device is reset to zero, and the control terminal is operated to move the main frame 21 to approach to a certain mark position X on the model;
then, the main frame piece 21 is moved in a small range to finely adjust the position of the main frame piece 21, and then the auxiliary frame piece 22 is extended out to enable the model to be positioned in the gap of the auxiliary frame piece 22;
placing the notched metal sheet Q on the subframe member 22, pushing the notched metal sheet to the model, and clamping the notched metal sheet Q with the model;
if the notch sheet metal is superposed with the mark position X, the current position is the reference position of the ice-shaped measurement auxiliary device; fig. 8 is a schematic diagram showing the notch metal sheet coinciding with the mark position X.
If the notched sheet metal does not coincide with the mark position X, the position of the main frame member 21 is readjusted until the notched sheet metal coincides with the mark position X.
After the notch sheet metal is superposed with the mark position X, the main frame member 21 is kept still, and the control terminal is operated to make the controller record the position, so that the reference position X' of the ice-shape measurement auxiliary device corresponding to the mark position X is obtained.
For other mark positions on the model, the reference positions of the ice-shaped measurement auxiliary device corresponding to the other mark positions can be measured in the same manner; alternatively, the reference position of the ice-shape measurement assisting device corresponding to the other mark position may be calculated by the positional relationship between the other mark position on the model and the mark position X.
The reference position measuring method does not take a reference object outside the model as a reference, so that the installation error of the model is eliminated; in addition, a certain mark position of the model can be arbitrarily selected according to actual use conditions and used for measuring the reference position of the ice shape measurement assisting device corresponding to the selected mark position, and the reference positions of the ice shape measurement assisting device corresponding to all the mark positions can also be measured.
Finally, ice shape measurements were taken after the model had frozen.
Specifically, before the model is frozen, a reference position of the ice-shaped measurement auxiliary device corresponding to the marking position is obtained, taking the marking position X as an example, after the model is frozen, the control terminal selects an automatic mode, the reference position X 'is input on the control terminal, the control terminal sends an instruction to the controller, and the controller controls the main frame part 21 to move to the reference position X';
then, the auxiliary frame member 22 automatically extends out, the heated notch metal sheet is placed on the auxiliary frame member 22, the notch metal sheet is pushed towards the ice-carrying model, and after a notch gap is obtained, the notch metal sheet is drawn back;
clamping the drawing board pasted with the coordinate paper into the notch, and drawing an ice shape at the marking position X on the coordinate paper by using a pencil;
then, other reference positions are input, the sub-frame member 22 is automatically retracted, the main frame member 21 is automatically moved, the main frame member 21 reaches the other input reference positions, the sub-frame member 22 is extended again, and then the same ice cutting and drawing steps are performed, so that the ice shapes of all the marked positions of the model are finally obtained.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method for ice measurement using an ice measurement aid, comprising the steps of:
installing an ice measurement aid, wherein the ice measurement aid comprises: the main frame is distributed along the vertical direction on the whole; a hot knife frame assembly vertically movable along the main frame; a position measurement assembly for measuring a position of the hot knife frame assembly on the main frame; the hot knife frame assembly comprises a main frame piece and an auxiliary frame piece, wherein the main frame piece is connected with the auxiliary frame piece in a sliding mode, and the auxiliary frame piece can horizontally move along the main frame piece; the position measurement assembly comprises a grating reading head and a grating ruler, wherein the grating reading head is installed on the main frame piece, and the grating ruler is installed on the main frame; the ice shape measurement aid has a manual mode and an automatic mode, and is selectable; before the model is frozen, selecting the ice shape measurement auxiliary device to be in a manual mode, and measuring a reference position of the ice shape measurement auxiliary device corresponding to the mark position of the model;
after the model is frozen, the ice-shaped measurement auxiliary device is selected to be in an automatic mode, a reference position is input, the main frame automatically moves to the reference position according to the measured reference position, and the auxiliary frame automatically extends out; placing the heated notch metal sheet on the auxiliary frame piece, pushing the notch metal sheet towards the ice-carrying model to obtain a notch gap, and then drawing back the notch metal sheet; and (4) clamping the drawing board pasted with the coordinate paper into the notch, and drawing the ice shape at the marked position on the coordinate paper.
2. The method for ice-shape measurement using the auxiliary device for ice-shape measurement according to claim 1, wherein the main frame includes a base, a frame, the base and the frame being fixedly connected; the frame is a non-closed hollow cylinder, and a vertical guide rail is arranged on a vertical frame of the frame.
3. The method for ice-shape measurement using the auxiliary device for ice-shape measurement according to claim 2, wherein the main frame member is provided with a vertical slider, and the vertical slider is slidably connected to the vertical guide rail.
4. The method as claimed in claim 1, wherein the main frame member is further provided with a horizontal proximity switch, and the main frame member is further provided with a vertical proximity switch.
5. The method as claimed in claim 1, wherein the main frame member further has a horizontal slide rail, the sub frame member has a horizontal slide block, and the main frame member and the sub frame member are slidably connected via the horizontal slide rail and the horizontal slide block.
6. The method of claim 1, further comprising a lift drive assembly for driving the hot blade frame assembly to move vertically along the main frame; the lifting driving assembly comprises a vertical motor, a vertical lead screw and a vertical nut, the vertical motor is fixedly installed on the main frame, and the vertical motor drives the vertical lead screw to rotate so as to drive the vertical nut to vertically move; the main frame piece is fixedly connected to the vertical nut.
7. The method of claim 1, further comprising a horizontal driving assembly for driving the sub frame member to move horizontally along the main frame member; the horizontal driving assembly comprises a horizontal motor, a horizontal lead screw and a horizontal nut, the horizontal motor is fixedly arranged on the main frame piece, and the horizontal motor drives the horizontal lead screw to rotate so as to drive the horizontal nut to horizontally move; the auxiliary frame piece is fixedly connected to the horizontal nut.
8. The method as claimed in claim 1, further comprising a controller, a motor driver, wherein the controller is used for receiving and processing the control command, converting the control command into a motor driving signal, and transmitting the motor driving signal to the motor driver.
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| CN111521131B (en) * | 2020-07-06 | 2020-10-16 | 中国空气动力研究与发展中心低速空气动力研究所 | Data acquisition device and data acquisition method for ice sample structural analysis |
| CN113483511B (en) * | 2021-09-07 | 2021-11-09 | 中国空气动力研究与发展中心低速空气动力研究所 | Ice-shaped cutter, ice-shaped measuring device and ice-shaped measuring method |
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