A two-dimensional ice form digital acquisition device and method

Abstract

The present invention relates to the technical field of ice shape measurement, and discloses a two-dimensional ice shape digital acquisition device and method. The two-dimensional ice shape digital acquisition device includes: a connecting member having a fixing groove that fits the surface of the aircraft; two wire displacement sensors disposed on the connecting member, and the wire ends of the two wire displacement sensors are respectively ball-jointed to a mapping pen; the mapping pen further has a mapping portion and an inclination sensor; the inclination sensor is used to obtain the angle between the mapping pen and the connecting member in the projection of the mapping pen in the first direction, and to obtain the angle between the mapping pen and the connecting member in the projection of the mapping pen in the second direction; wherein, the first direction and the second direction are configured to be parallel to the connecting member and perpendicular to each other. The two-dimensional ice shape digital acquisition method is applied to the two-dimensional ice shape digital acquisition device. Through the above technical solution, the present invention can solve the technical problems of low efficiency and large error existing in the hot knife method in the related art.

Description

Technical Field

[0001] The present invention relates to the technical field of ice shape measurement, and particularly to a two-dimensional ice shape digital acquisition device and method. Background Art

[0002] After the icing wind tunnel test is completed, an ice shape measurement method is required to obtain the ice shape. The existing ice shape measurement methods are divided into two categories: contact measurement and non-contact measurement. Among them, in the hot knife method of contact measurement, the hot knife is made of a copper thin sheet with the same profile line as the cross-section of the aircraft model at the leading edge. When in use, the heated hot knife is horizontally inserted into the leading edge ice accumulation of the aircraft model where the ice shape needs to be obtained, and the heat of the copper thin sheet is used to melt the ice accumulation at the contact part. After the cutting is completed, the hot knife is withdrawn, and then inserted into the grid paper matching the leading edge of the prefabricated aircraft model, and the ice shape is depicted with a pencil. Then, the records of the depicted grid paper are manually confirmed, scanned twice, and digitally recognized. This process has low automation, slow process, and relatively large errors caused by multiple steps superimposed.

[0003] Therefore, providing a two-dimensional ice shape digital acquisition device and method that can improve the ice shape measurement efficiency and reduce the measurement error is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The present invention discloses a two-dimensional ice shape digital acquisition device and method to solve the technical problems of low efficiency and large errors existing in the hot knife method in related technologies.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, a two-dimensional ice shape digital acquisition device is disclosed, including:

[0007] A connecting piece having a fixing groove that fits the surface of the aircraft;

[0008] Two wire displacement sensors are arranged on the connecting piece, and the wire ends of the two wire displacement sensors are respectively ball-jointed to a mapping pen;

[0009] The mapping pen further has a mapping part and an inclination sensor;

[0010] The inclination sensor is used to obtain the angle between the mapping pen and the connecting piece in the projection of the mapping pen in the first direction, and to obtain the angle between the mapping pen and the connecting piece in the projection of the mapping pen in the second direction;

[0011] Wherein, the first direction and the second direction are configured to be parallel to the connecting piece and perpendicular to each other.

[0012] In some solutions, the mapping pen has a pressure sensing switch and a power switch;

[0013] When the pressure sensing switch and the power switch are both turned on, the surveying and mapping unit can output data.

[0014] In some solutions, the length of the surveying and mapping pen is greater than the maximum thickness of the ice layer attached to the aircraft.

[0015] In some solutions, the length of the surveying and mapping pen is 2 - 10 times the maximum thickness of the ice layer attached to the aircraft.

[0016] In some solutions, the length of the surveying and mapping pen is less than 30 cm.

[0017] In some solutions, the resolution of the wire - pulling displacement sensor is less than the diameter of the wire - pulling end.

[0018] In some solutions, the surveying and mapping unit is a pressure - sensitive pen tip, and the pressure trigger threshold of the pressure - sensitive pen tip is adjustable.

[0019] In some solutions, the fixed point of the surveying and mapping pen has a ball joint, and the two wire - pulling ends are respectively connected to the ball joint.

[0020] In a second aspect, a two - dimensional ice shape digital acquisition method is disclosed, which is applied to the two - dimensional ice shape digital acquisition device in the first aspect, and includes the following steps:

[0021] Taking any point of the connecting piece as the coordinate origin, taking the first direction as the X - axis, the second direction as the Y - axis, and the third direction as the Z - axis, a three - dimensional coordinate system is established;

[0022] Obtaining the distance L1 between one of the wire - pulling displacement sensors and the fixed point, and the distance L2 between the other wire - pulling displacement sensor and the fixed point; obtaining the angle α between the surveying and mapping pen and the connecting piece in the projection of the surveying and mapping pen in the first direction, and obtaining the angle β between the surveying and mapping pen and the connecting piece in the projection of the surveying and mapping pen in the second direction;

[0023] According to L1, L2, α, β and the distance L0 from the surveying and mapping unit to the fixed point, the real - time coordinate position of the surveying and mapping unit is obtained;

[0024] Locally smoothing the coordinate position of the surveying and mapping unit to obtain an ice shape curve.

[0025] In some solutions, the step of locally smoothing the coordinate position of the surveying and mapping unit to obtain an ice shape curve further includes:

[0026] Eliminating noise points according to the trigger threshold of the surveying and mapping unit.

[0027] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0028] The two-dimensional ice shape digital acquisition device of the present application heats the connecting piece before mapping the ice shape, so that the connecting piece has a certain amount of heat. The ice formed on the aircraft melts at the part in contact with the connecting piece, and the connecting piece is connected to the aircraft through the fixing groove. During the process of mapping the ice shape, the mapping part of the mapping pen is placed at the junction of the ice layer and the connecting piece, and data at this place is output through the mapping part. The operator moves the mapping pen along the outer surface of the ice layer, thereby completing the mapping of the ice shape. During the process of the mapping pen moving along the outer surface of the ice layer, the inclination sensor real-time obtains the angle between the mapping pen and the connecting piece in the projection of the mapping pen in the first direction, and real-time obtains the angle between the mapping pen and the connecting piece in the projection of the mapping pen in the second direction; two wire-pulling displacement sensors real-time obtain the distances between the wire-pulling ends and the ball joint of the mapping pen respectively, thereby obtaining the real-time position of the fixed point of the mapping pen. Then, since the length from the fixed point to the mapping part is fixed, the real-time position of the mapping part can be obtained. After subsequent processing, the ice shape curve can be obtained. Compared with the hot knife method in the prior art, the present application does not require manual secondary confirmation, scanning and digital recognition of the hand-drawn ice shape, saves steps, increases the mapping efficiency, and reduces the measurement error caused by cumbersome steps and manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 is the axonometric view when the two-dimensional ice shape digital acquisition device of the present invention fits with the surface of the aircraft;

[0031] Figure 2 is Figure 1 the enlarged view of part A in

[0032] Figure 3 is the flow chart of the two-dimensional ice shape digital acquisition method of the present invention.

[0033] In the figure:

[0034] 110 - connecting piece, 120 - wire-pulling displacement sensor, 121 - wire-pulling end, 130 - mapping pen, 131 - mapping part, 132 - inclination sensor, 133 - ball joint;

[0035] 200 - aircraft;

[0036] 300 - ice layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope protected by the present invention.

[0038] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same category, and the number of objects is not limited. For example, the first object can be one or multiple.

[0039] During the process of using the hot knife method to map the ice shape on the aircraft 200, the inventor found that the hot knife in the existing hot knife method is made of a copper thin sheet with the same profile line as the cross-section of the aircraft 200 model at the leading edge. When in use, the heated hot knife is horizontally inserted into the leading-edge icing of the aircraft 200 model where the ice shape needs to be obtained, and the heat of the copper thin sheet is used to melt the ice at the contact part. After cutting is completed, the hot knife is withdrawn, and then it is inserted into the grid paper matching the leading edge of the prefabricated aircraft 200 model and the ice shape is depicted with a pencil. Then, the records of the depicted grid paper are manually confirmed, secondarily scanned, and digitally recognized. This process has a low degree of automation, a slow process, and relatively large errors caused by the superposition of multiple steps.

[0040] The following will be combined with the attached Figures 1 to 3 drawings to describe in detail a two-dimensional ice shape digital acquisition device and method provided by this application through specific embodiments and their application scenarios.

[0041] Some embodiments of this application provide a two-dimensional ice shape digital acquisition device, as Figure 2 shown, including a connecting piece 110, a mapping pen 130, and two wire-pulling displacement sensors 120.

[0042] As Figure 1 and Figure 2 shown, the connecting piece 110 has a fixing groove that fits the surface of the aircraft 200. During processing, a fixing groove with the same profile line as the surface of the aircraft 200 is cut on the connecting piece 110, so that when the connecting piece 110 is installed on the surface of the aircraft 200, the connecting piece 110 can be completely attached to the surface of the aircraft 200 to increase the stability when the connecting piece 110 is installed on the surface of the aircraft 200.

[0043] It should be noted that the surface of the aircraft 200 in this embodiment refers to the wing surface.

[0044] Preferably in this embodiment, the connecting member 110 is a thin sheet made of copper. Since the fixing groove of the connecting member 110 needs to be heated before being attached to the surface of the aircraft 200, so that the connecting member 110 has sufficient heat to melt the ice. Therefore, copper is selected to make the connecting member 110. Utilizing the relatively high thermal conductivity of copper, it can quickly heat up during the heating process. Moreover, the copper material is cheap, and the cost of processing it into the connecting member 110 is low. It goes without saying that the connecting member 110 can also be made of other materials, and this embodiment does not limit this.

[0045] In addition, the connecting member 110 is made into a thin sheet shape, so that the connecting member 110 has a smaller thickness. During the ice melting process of the connecting member 110, the contact area with the ice layer 300 is relatively reduced, so that the amount of ice that needs to be melted during ice melting is also correspondingly reduced, and the ice melting speed can be increased. Moreover, the heat generated by the thin-sheet-shaped connecting member 110 during the ice melting process is relatively small, and the influence on the surrounding ice layer 300 is small, so as to reduce the error generated on the surface of the surveyed ice layer 300.

[0046] As Figure 2 shown, the surveying pen 130 has a surveying part 131. The surveying pen 130 is the main tool for surveying the surface curve of the ice layer 300. During the process of surveying the ice shape, the surveying part 131 of the surveying pen 130 is placed at the junction of the ice layer 300 and the connecting member 110 and outputs data. The operator moves the surveying pen 130 along the outer surface of the ice layer 300, and then completes the surveying of the ice shape.

[0047] Specifically, the surveying pen 130 has an induction switch and a power switch. When both the induction switch and the power switch are turned on, the surveying part 131 can output data. The induction switch is used to detect whether the surveying part 131 touches the surface of the ice layer 300. When the induction switch is triggered, it indicates that the surveying pen 130 has been in the correct surveying position. At this time, turning on the power switch again can ensure that the surveying pen 130 starts surveying at the accurate position, thereby improving the accuracy of the survey.

[0048] In addition, if the surveying part 131 starts to output data without correctly touching the surface of the ice layer 300, these data will be redundant and may even be incorrect. Through the dual control of the induction switch and the power switch, this situation can be avoided.

[0049] In this embodiment, the surveying part 131 is a pressure-sensitive pen tip. There is a pressure sensor inside the pressure-sensitive pen tip, which can sense the pressure change generated when the pen tip touches the surface of the ice layer 300 and is converted into an electrical signal, and is processed and transmitted through the circuit inside the surveying pen 130.

[0050] Utilizing the pressure-sensitive characteristic of the pressure-sensitive pen tip, the detailed features on the surface of the ice layer 300, such as tiny depressions and protrusions, can be more accurately reflected, thereby better mapping the curve on the surface of the ice layer 300.

[0051] In this embodiment, the pressure trigger threshold of the pressure-sensitive pen tip is adjustable. For example, the pressure trigger threshold can be adjusted between 0.5N - 5N, and the pressure trigger threshold can be flexibly adjusted according to the usage habits of different operators.

[0052] It should be noted that this embodiment adopts a pressure-sensitive pen tip with an adjustable pressure trigger threshold in the prior art. Therefore, this embodiment will not elaborate on how to adjust the pressure trigger threshold of the pressure-sensitive pen tip.

[0053] The pressure-sensitive pen tip is provided with a pressure trigger threshold, such that the pressure-sensitive pen tip needs to contact the surface of the ice layer 300 and under the action of a certain force, can the pressure-sensitive pen tip output data, which can ensure that data recording is only performed when the pressure-sensitive pen tip truly contacts the ice layer 300 and applies a certain pressure, thereby avoiding accidental touch or misoperation and reducing the generation of redundant data.

[0054] As Figure 2 shown, the wire ends 121 of the two wire displacement sensors 120 are respectively connected to the fixed points of the mapping pen 130. During the process of the mapping pen 130 moving along the surface of the ice layer 300, the lengths of the two wire ends 121 change in real time, and the lengths of the wire ends 121 are obtained in real time through the wire displacement sensors 120.

[0055] Specifically, as Figure 2 shown, the fixed point of the mapping pen 130 has a ball joint 133, and the two wire ends 121 are respectively connected to the ball joint 133. The ball joint 133 allows the wire ends 121 to perform relative rotation within a certain range, thereby increasing the flexibility of the mapping pen 130 during use. At the same time, due to the presence of the ball joint 133, during the turning process of the mapping pen 130, the situation where one wire end 121 is taut and the other wire end 121 is slack will not occur, thereby ensuring that the two wire displacement sensors 120 can accurately obtain the correct real-time lengths of the two wire ends 121.

[0056] Preferably in this embodiment, the ball joint 133 is arranged at the top of the mapping pen 130, which can further reduce the operation obstacles when the mapping pen 130 moves.

[0057] As Figure 2As shown, the length of the surveying pen 130 is greater than the maximum thickness of the ice layer 300 attached to the aircraft 200. When the length of the surveying pen 130 is greater than the maximum thickness of the ice layer 300 attached to the aircraft 200, it can ensure that the surveying pen 130 will not collide with the ice layer 300 in other places during the process of surveying the surface of the ice layer 300, so as to improve the surveying efficiency.

[0058] In some embodiments, the length of the surveying pen 130 is 2 - 10 times the maximum thickness of the ice layer 300 attached to the aircraft 200. During the process of the surveying pen 130 surveying the surface of the ice layer 300, since the length of the surveying pen 130 is 2 - 10 times the maximum thickness of the ice layer 300 attached to the aircraft 200, the ball joint 133 and the two cable ends 121 can always maintain a certain distance from the ice layer 300, enabling the cable ends 121 to maintain a stable and unobstructed state during the measurement process, thus ensuring the accuracy and reliability of the surveying data. If the length of the surveying pen 130 is insufficient, the cable may bend or the tension may change due to the obstruction of the ice layer 300, thereby affecting the measurement result.

[0059] In some embodiments, the length of the surveying pen 130 is less than 30 cm. By setting the length of the surveying pen 130 below 30 cm, while ensuring that the ball joint 133 and the two cable ends 121 can always maintain a certain distance from the ice layer 300, it also avoids the situation where the length of the cable end 121 becomes too long due to the overly long surveying pen 130.

[0060] In some embodiments, the resolution of the cable displacement sensor 120 is less than the diameter of the cable end 121. When the resolution of the cable displacement sensor 120 is less than the diameter of the cable end 121, since it can capture the displacement change of the cable end 121 more precisely, the measurement error caused by the diameter of the cable end 121 can be reduced. The high - resolution cable displacement sensor 120 is more sensitive to the displacement change of the cable end 121. In the case of a small displacement of the cable end 121, the cable displacement sensor 120 can also respond quickly and record it, ensuring that the length value of the cable end 121 can be obtained in real - time.

[0061] For example, the resolution of the cable displacement sensor 120 is 0.1 mm. The cable displacement sensor 120 with a resolution of 0.1 mm is more sensitive to the displacement change of the cable end 121. In the case of a small displacement of the cable end 121, the cable displacement sensor 120 can also respond quickly and record it, ensuring that the length value of the cable end 121 can be obtained in real - time.

[0062] Such as Figure 2As shown, the surveying pen 130 is provided with an inclination sensor 132. The inclination sensor 132 is used to obtain the angle between the surveying pen 130 and the connecting member 110 in the projection of the surveying pen 130 in the first direction, and to obtain the angle between the surveying pen 130 and the connecting member 110 in the projection of the surveying pen 130 in the second direction. The first direction and the second direction are configured to be parallel to the connecting member 110 and perpendicular to each other.

[0063] The inclination sensor 132 obtains the angle between the surveying pen 130 and the connecting member 110 in the projection of the surveying pen 130 in the first direction in real time, and obtains the angle between the surveying pen 130 and the connecting member 110 in the projection of the surveying pen 130 in the second direction in real time. The two wire displacement sensors 120 obtain the distance between the wire end 121 and the ball joint 133 of the surveying pen 130 in real time. According to the above parameters, the real-time position of the fixed point of the pen can be calculated by combining geometric equations. Since the distance between the fixed point and the surveying and mapping part 131 is fixed, the real-time position of the surveying and mapping part 131 can be calculated, and then after later processing, the ice shape curve is obtained.

[0064] Specifically, a three-dimensional coordinate system is established with any point on the connecting member 110 as the coordinate origin, the first direction being the X axis, and the second direction being the Y axis.

[0065] Some embodiments of the present application also provide a two-dimensional ice shape digital acquisition method, such as Figure 3 As shown, the device is applied to a two-dimensional ice shape digital acquisition device, comprising the following steps:

[0066] Step 100: Establish a three-dimensional coordinate system with any point of the connecting member 110 as the coordinate origin, the first direction as the X-axis, the second direction as the Y-axis, and the third direction as the Z-axis;

[0067] Step 200: obtaining a distance L1 between one of the wire displacement sensors 120 and the fixed point, and a distance L2 between the other wire displacement sensor 120 and the fixed point; obtaining an angle α between the surveying pen 130 and the connecting member 110 in the projection of the surveying pen 130 in the first direction, and obtaining an angle β between the surveying pen 130 and the connecting member 110 in the projection of the surveying pen 130 in the second direction;

[0068] Step 300: Obtain the real-time coordinate position of the surveying and mapping unit 131 according to L1, L2, α, β and the distance L0 from the surveying and mapping unit 131 to the fixed point.

[0069] Step 400: Locally smooth the coordinate position of the surveying and mapping unit 131 to obtain an ice shape curve.

[0070] Preferably in this embodiment, the connecting member 110 is rectangular. In order to better obtain the included angle α and the included angle β, in step 100, the first direction is preferably parallel to the first side of the connecting member 110, and the second direction is preferably parallel to the second side of the connecting member 110. Wherein, the first side and the second side of the connecting member 110 are perpendicular to each other.

[0071] In step 200, the wire end 121 of the wire displacement sensor 120 is connected to the fixed point of the mapping pen 130. As the mapping pen 130 moves, the wire end 121 will extend and contract. The two wire displacement sensors 120 can obtain the real-time lengths L1 and L2 of the two wire ends 121. Moreover, as the mapping pen 130 moves, the inclination sensor 132 can obtain in real time the included angle α between the mapping pen 130 and the connecting member 110 in the projection of the mapping pen 130 in the first direction, and the included angle β between the mapping pen 130 and the connecting member 110 in the projection of the mapping pen 130 in the second direction.

[0072] In step 300, let the positions of the two wire displacement sensors 120 be point A and point B, the position of the mapping part 131 be point C, and the position of the fixed point be point D. There are the following relational expressions:

[0073] |AD| = L1

[0074] |BD| = L2

[0075] Let the coordinates of point C of the mapping part 131 be (x 0 、y 0 、z 0 ), and the coordinates of point D of the fixed point be (x 1 、y 1 、z 1 ). There are the following relational expressions:

[0076]

[0077]

[0078] Since the mapping part 131 is always in contact with the junction of the ice layer 300 and the connecting member 110 during the process of the mapping pen 130 depicting the surface of the ice layer 300, there is the relational expression:

[0079] z 0 = 0

[0080] Moreover, the distance from the fixed point to the mapping part 131 is fixed, that is, there is the relational expression:

[0081] |CD| = L0

[0082] By combining the above six relationship expressions, according to analytic geometry, the real-time coordinates of the fixed point D can be obtained first, and then the real-time coordinates of the surveying and mapping part 131C can be obtained based on the real-time coordinates of the fixed point D.

[0083] In step 400, when the surveying pen 130 moves along the surface of the ice layer 300, the coordinates of the plurality of surveying parts 131 can be obtained according to steps 200 and 300, and the ice shape curve can be obtained by locally smoothing the coordinates of the plurality of surveying parts 131.

[0084] It should be noted that the method for local smoothing of a number of coordinate points is a prior art and is not an improvement of this embodiment, and will not be described in detail here.

[0085] In step 400, noise points are eliminated according to the trigger threshold of the surveying and mapping unit 131. Data points below the trigger threshold are marked as noise points by a computer program and the noise points are deleted. In the process of surveying and mapping the surface of the ice layer 300, eliminating noise points can reduce the impact of these abnormal values ​​on the overall accuracy of the data, making the data closer to the actual situation.

[0086] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0087] In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0088] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A two-dimensional ice shape digital acquisition device, characterized in that: include: A connecting piece having a fixing groove that fits the surface of the aircraft; Two wire displacement sensors are arranged on the connecting member, and the wire ends of the two wire displacement sensors are respectively connected to the fixed points of the surveying pen; The surveying pen also has a surveying part and an inclination sensor; The inclination sensor is used to obtain the angle between the surveying pen and the connecting member in the projection of the surveying pen in the first direction, and to obtain the angle between the surveying pen and the connecting member in the projection of the surveying pen in the second direction; Wherein, the first direction and the second direction are configured to be parallel to the connecting member and perpendicular to each other.

2. A two-dimensional ice shape digital acquisition device according to claim 1, characterized in that: The surveying and mapping pen has an induction switch and a power switch; When the sensing switch and the power switch are turned on at the same time, the surveying and mapping unit can output data.

3. A two-dimensional ice shape digital acquisition device according to claim 1, characterized in that: The length of the surveying pen is greater than the maximum thickness of the ice layer attached to the aircraft.

4. A two-dimensional ice shape digital acquisition device according to claim 3, characterized in that: The length of the surveying pen is 2-10 times the maximum thickness of the ice layer attached to the aircraft.

5. A two-dimensional ice shape digital acquisition device according to claim 3 or 4, characterized in that: The length of the surveying pen is less than 30 cm.

6. The two-dimensional ice shape digital acquisition device according to claim 1, characterized in that: The resolution of the wire displacement sensor is smaller than the diameter of the wire end.

7. The two-dimensional ice shape digital acquisition device according to claim 1, characterized in that: The surveying and mapping part is a pressure-sensitive pen tip, and the pressure triggering threshold of the pressure-sensitive pen tip is adjustable.

8. The two-dimensional ice shape digital acquisition device according to claim 1, characterized in that: The fixing point of the surveying pen has a ball joint, and the two pull wire ends are respectively connected to the ball joint.

9. A two-dimensional ice shape digital acquisition method, characterized in that: The two-dimensional ice shape digital acquisition device as described in any one of claims 1 to 8 comprises the following steps: A three-dimensional coordinate system is established with any point of the connecting member as the coordinate origin, the first direction as the X-axis, the second direction as the Y-axis, and the third direction as the Z-axis; Obtain a distance L1 between one of the pull-wire displacement sensors and the fixed point, and a distance L2 between the other pull-wire displacement sensor and the fixed point; obtain an angle α between the surveying pen and the connecting member in the projection of the surveying pen in the first direction, and obtain an angle β between the surveying pen and the connecting member in the projection of the surveying pen in the second direction; According to L1, L2, α, β and the distance L0 from the surveying and mapping department to the fixed point, the real-time coordinate position of the surveying and mapping department is obtained; The coordinate position of the surveying and mapping unit is locally smoothed to obtain the ice shape curve.

10. A two-dimensional ice shape digital acquisition method according to claim 9, characterized in that: The step of locally smoothing the coordinate position of the surveying and mapping unit to obtain an ice shape curve also includes: Noise points are eliminated according to the trigger threshold of the surveying and mapping department.

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