A tape measure mechanism and method of controlling the same

Abstract

The application provides a guy line ruler mechanism, which comprises a steel wire rope guide pipe having a track for guiding a steel wire rope; a steel wire rope reel mounted at one end of the steel wire rope guide pipe, the steel wire rope being wound on the steel wire rope reel and extending to a first guide wheel at the other end of the steel wire rope guide pipe through the track of the steel wire rope guide pipe; a driving device comprising a stepping motor and a controller connected with the stepping motor, the stepping motor rotating with the steel wire rope reel and outputting pulses to the controller, and the controller controlling the stepping motor through the pulses; and a stamp mounted on an output shaft of an electromagnet, the electromagnet being controlled by the controller.

Description

Technical Field

[0001] This application belongs to the field of control measurement, and specifically relates to a string ruler mechanism and its control method. Background Technology

[0002] In static strength and fatigue strength tests of aircraft structures, "adhesive tape" is one of the most basic and commonly used loading tools. The "adhesive tape" used in aircraft static strength tests is actually a canvas loading tool made of strong adhesive and adhered to the aircraft surface to withstand tensile forces. The placement of the "adhesive tape" on the aircraft surface requires manual measurement and marking. Existing methods for measurement and marking involve using a steel ruler or tape measure to draw points according to a baseline. However, both steel rulers and tape measures have certain "width" and "rigidity." The "width" of the ruler causes a certain degree of skew when it is applied to the aircraft surface (points on the aircraft surface often have curvature in both directions); the "rigidity" of the ruler makes it difficult to completely adhere to the aircraft surface. Both factors lead to measurement deviations, especially when the aircraft surface has significant curvature in both vertical directions, making it even more difficult to achieve an effective measurement position. Summary of the Invention

[0003] To address the aforementioned problems, this application provides a string ruler mechanism, comprising:

[0004] A wire rope conduit having a track for guiding the wire rope;

[0005] A wire rope reel is installed at one end of a wire rope conduit. A wire rope is wound on the wire rope reel. The wire rope extends through the track of the wire rope conduit to a first guide wheel at the other end of the wire rope conduit.

[0006] The driving device includes a stepper motor and a controller connected to the stepper motor. The stepper motor rotates with the wire rope reel and outputs pulses to the controller. The controller controls the stepper motor through the pulses.

[0007] The stamp is mounted on the output shaft of an electromagnet, which is controlled by a controller.

[0008] Preferably, the driving device further includes a motor bracket and a motor support; the motor bracket is fixed on the wire rope guide tube, and the motor bracket has a double-ear structure. The drive shaft of the stepper motor is inserted into the through hole of one ear of the double-ear structure, and the tail end of the stepper motor is inserted into the through hole of the other ear of the double-ear structure through the motor support. The wire rope reel is sleeved on the outside of the stepper motor, and one end hole of the wire rope reel is shaped and connected to the drive shaft of the stepper motor. The other end hole of the wire rope reel is rotatably sleeved with the motor support; the drive shaft of the stepper motor and the wire rope reel rotate synchronously.

[0009] Preferably, a copper bushing bearing is provided between the drive shaft of the stepper motor and the through hole of one ear piece of the double-ear structure, and a bearing is provided between the motor support and the through hole of the other ear piece of the double-ear structure.

[0010] Preferably, the end of the wire rope conduit away from the first guide wheel has a hand grip.

[0011] Preferably, the track is formed by the central hole of the wire rope guide.

[0012] Preferably, the wire rope reel also has a second guide wheel, which guides the wire rope on the wire rope reel to the wire rope guide tube.

[0013] A control method for a pull-string ruler mechanism, wherein the controller controls the stepper motor to be in a free state, and the controller receives pulses generated by the stepper motor being driven to rotate by the wire rope reel;

[0014] The controller calculates the outgoing length of the wire rope based on the pulse and the diameter of the wire rope reel;

[0015] When the length of the lead wire reaches the preset value, the controller controls the stepper motor to stop rotating, and the controller controls the electromagnet to extend and drive the stamp to draw the reference line of the adhesive tape on the surface of the aircraft.

[0016] Preferably, a pressure plate is provided on the wire rope reel, the pressure plate measures the diameter of the wire rope reel, and the pressure plate sends the measured diameter information to the controller.

[0017] The advantages of this application include: It employs a wire-drawing method, with the end of the wire fixed to a baseline. A thin steel wire rope acts as a measuring ruler; after pulling out a set effective length, points are marked and lines are drawn, making the positioning of the adhesive tape more accurate and effectively improving work efficiency. The pulled-out length is achieved through a stepper motor controlled by a microcontroller. This application incorporates a pressure plate structure that can measure the diameter of the steel wire rope reel, including the steel wire rope itself, and correct the diameter measured by the controller. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the working principle of a preferred embodiment of the string ruler mechanism of this application;

[0019] Figure 2 This is a schematic diagram of a preferred embodiment of the string ruler mechanism of this application;

[0020] Figure 3 This is a schematic diagram of a preferred embodiment of the scroll assembly of this application;

[0021] Figure 4 This is a schematic diagram illustrating the usage of a preferred embodiment of the string ruler mechanism in this application. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] like Figure 1-4 As shown, this application provides a pull-string ruler mechanism, comprising:

[0024] Wire rope guide 6, which has a track for guiding the wire rope;

[0025] A wire rope reel 7 is installed at one end of a wire rope conduit 6. A wire rope is wound on the wire rope reel 7. The wire rope extends through the track of the wire rope conduit 6 to a first guide wheel 2 at the other end of the wire rope conduit 6.

[0026] The driving device includes a stepper motor 5 and a controller 15 connected to the stepper motor 5. The stepper motor 5 rotates with the wire rope reel 7 and outputs pulses to the controller 15. The controller 15 controls the stepper motor 5 through the pulses.

[0027] Stamp 11 is mounted on the output shaft of electromagnet 10, which is controlled by controller 15. Under non-overload conditions, the speed and stopping position of stepper motor 5 depend only on the frequency and number of pulse signals, and are unaffected by load changes. When the stepper driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle in a set direction, called the "step angle." Its rotation occurs step by step at fixed angles. The angular displacement can be controlled by controlling the number of pulses, thereby achieving accurate positioning. Applying the characteristics of the stepper motor in reverse, the extended length of the wire rope can be measured using the pulses generated by the passive rotation of the stepper motor.

[0028] In some optional embodiments, the driving device further includes a motor bracket 4 and a motor support 16; the motor bracket 4 is fixed on the wire rope guide 6, and the motor bracket 4 has a double-ear structure. The drive shaft of the stepper motor 5 is inserted into the through hole of one ear of the double-ear structure, and the tail end of the stepper motor 5 is inserted into the through hole of the other ear of the double-ear structure through the motor support 16. The wire rope reel 7 is sleeved on the outside of the stepper motor 5. One end hole of the wire rope reel 7 is shaped and connected to the drive shaft of the stepper motor 5, and the other end hole of the wire rope reel 7 is rotatably sleeved with the motor support 16; the drive shaft of the stepper motor 5 and the wire rope reel 7 rotate synchronously.

[0029] In some alternative embodiments, a copper bushing bearing 12 is provided between the drive shaft of the stepper motor 5 and the through hole of one ear piece of the double-ear structure, and a bearing is provided between the motor support 16 and the through hole of the other ear piece of the double-ear structure.

[0030] In some alternative embodiments, the end of the wire rope conduit 6 away from the first guide wheel 2 has a hand grip handle 9.

[0031] In some alternative embodiments, the track is formed by a central hole in a wire rope conduit 6 through which the wire rope extends to the other end.

[0032] In some alternative embodiments, the wire rope reel 7 also has a second guide wheel 3, which guides the wire rope of the wire rope reel 7 to the wire rope guide tube 6.

[0033] A control method for a pull-string ruler mechanism is provided, wherein the controller 15 controls the stepper motor 5 to be in a free state, and the controller 15 receives pulses generated by the stepper motor 5 being driven to rotate by the wire rope reel 7.

[0034] The controller 15 calculates the outgoing length of the wire rope based on the pulse and the diameter of the wire rope reel 7;

[0035] When the length of the lead wire reaches the preset value, the controller 15 controls the stepper motor 5 to stop rotating, and the controller 15 controls the electromagnet 10 to extend and drive the stamp 11 to draw the reference line of the adhesive tape on the surface of the aircraft.

[0036] In some alternative embodiments, a pressure plate is provided on the wire rope reel 7, the pressure plate measuring the diameter of the wire rope reel 7, and the pressure plate sending the measured diameter information to the controller 15.

[0037] The general usage method of the pull-line ruler mechanism in this application is as follows: Figure 4As shown, when in use, first fix the end of the wire rope to the reference position, set the pull distance, and when the length of the thin wire rope is less than the set length, the stepper motor is in a free state. The controller outputs pulses through the control line of the 5-stepper motor to measure the number of rotations of the wire rope reel, thereby measuring the length of the wire rope. When the set pull distance is reached, the controller controls the stepper motor to stop rotating. At this time, the electromagnet is energized and extends outward, driving the stamp to draw the reference line of the adhesive tape on the surface of the aircraft.

[0038] The advantages of this application include: It employs a wire-drawing method, with the end of the wire fixed to a baseline. A thin steel wire rope acts as a measuring ruler; after pulling out a set effective length, points are marked and lines are drawn, making the positioning of the adhesive tape more accurate and effectively improving work efficiency. The pulled-out length is achieved through a stepper motor controlled by a microcontroller. This application incorporates a pressure plate structure that can measure the diameter of the steel wire rope reel, including the steel wire rope itself, and correct the diameter measured by the controller.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pull-string ruler mechanism, characterized in that, include: Wire rope conduit (6), which has a track for guiding the wire rope; A wire rope reel (7) is installed at one end of a wire rope conduit (6). A wire rope is wound on the wire rope reel (7). The wire rope extends through the track of the wire rope conduit (6) to the first guide wheel (2) at the other end of the wire rope conduit (6). The driving device includes a stepper motor (5) and a controller (15) connected to the stepper motor (5). The stepper motor (5) rotates with the wire rope reel (7) and outputs pulses to the controller (15). The controller (15) controls the stepper motor (5) through the pulses. Stamp (11), stamp (11) is installed on the output shaft of electromagnet (10), electromagnet (10) is controlled by controller (15); The driving device also includes a motor bracket (4) and a motor support (16); the motor bracket (4) is fixed on the wire rope guide (6), the motor bracket (4) has a double-ear structure, the drive shaft of the stepper motor (5) is inserted into the through hole of one ear of the double-ear structure, the tail end of the stepper motor (5) is inserted into the through hole of the other ear of the double-ear structure through the motor support (16), the wire rope reel (7) is sleeved on the outside of the stepper motor (5), one end hole of the wire rope reel (7) is connected to the drive shaft of the stepper motor (5) in shape matching, and the other end hole of the wire rope reel (7) is rotatably sleeved with the motor support (16); the drive shaft of the stepper motor (5) and the wire rope reel (7) rotate synchronously; A copper bushing bearing (12) is provided between the drive shaft of the stepper motor (5) and the through hole of one ear piece of the double ear structure, and a bearing is provided between the motor support (16) and the through hole of the other ear piece of the double ear structure. A pressure plate is provided on the wire rope reel (7), the pressure plate measures the diameter of the wire rope reel (7), and the pressure plate sends the measured diameter information to the controller (15).

2. The string ruler mechanism as described in claim 1, characterized in that, The end of the wire rope conduit (6) away from the first guide wheel (2) has a hand grip handle (9).

3. The string ruler mechanism as described in claim 1, characterized in that, The track is formed by the central hole of the wire rope conduit (6).

4. The string ruler mechanism as described in claim 1, characterized in that, The wire rope reel (7) also has a second guide wheel (3), which guides the wire rope of the wire rope reel (7) to the wire rope guide tube (6).

5. A method for controlling a string ruler mechanism, used to control the string ruler mechanism as described in any one of claims 1-4, characterized in that, The controller (15) controls the stepper motor (5) to be in a free state. The controller (15) receives the pulses generated by the stepper motor (5) being driven to rotate by the wire rope reel (7). The controller (15) calculates the outgoing length of the wire rope based on the pulse and the diameter of the wire rope reel (7); When the length of the lead wire reaches the preset value, the controller (15) controls the stepper motor (5) to stop rotating, and the controller (15) controls the electromagnet (10) to extend and drive the stamp (11) to draw the reference line of the tape on the surface of the aircraft.

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