Rope tension measuring device and tension calculating method thereof

Abstract

The invention provides a rope tension measuring device, which comprises a base provided with a linear chute and two fixed wheels; the driving wheel is installed in the sliding groove, and the driving wheel can slide along the sliding groove; one end of the sensor is connected with the driving wheel; one end of the adapter arm is connected with the other end of the sensor; the handle is provided with an opening groove, and the opening of the opening groove is rotationally connected with the other end of the adapter arm; one end of the rocker arm is rotationally connected to the base, and the other end of the rocker arm is arranged in the open slot and rotationally connected with the open slot; meanwhile, the invention further provides a rope tension measuring method. A rope is placed between the fixed wheel and the movable wheel, when the handle is rotated, the movable wheel can slide along the sliding groove to extrude the rope until the rope is bent, the sensor measures the longitudinal pressing force of the rope, and the tension of the rope is determined based on the longitudinal pressing force of the rope.

Description

Technical Field

[0001] The present application belongs to the field of aviation assembly technology, and in particular relates to a rope tension measuring device and a tension calculation method thereof. Background Art

[0002] In the field of aviation assembly technology, after the assembly of cables, steel cables, copper cables and other rope-like objects is completed, the preload force of the rope must be tested, and the preload force value can be used to determine whether the corresponding system meets the design index requirements.

[0003] At present, the tension meters used to calibrate rope tension in my country are mainly imported products. The imported products have short service life and high unit cost. In view of the particularity of the aviation industry, the imported wire rope tension meters have no after-sales service. As a result, a large number of fault detection equipment are piled up in the warehouse. In order to solve the problem of localization of the equipment and save the cost of use and maintenance, this equipment and related technologies such as calculation methods were developed to replace the original imported equipment. Summary of the invention

[0004] Purpose of the invention: The present invention proposes a cable and rope tension measuring device and calculation method, which can quickly and accurately measure the cable and rope tension value, and provide a domestic alternative to imported equipment.

[0005] In a first aspect, the present application provides a rope tension measuring device, the device comprising:

[0006] A base having a straight-shaped slideway and two fixed wheels;

[0007] A moving wheel is installed in the slide groove, and the moving wheel can slide along the slide groove;

[0008] A sensor, one end of which is connected to the moving wheel;

[0009] A transfer arm, one end of which is connected to the other end of the sensor;

[0010] The handle has an open slot, and the opening of the open slot is rotatably connected to the other end of the transfer arm;

[0011] A rocker arm, one end of which is rotatably connected to the base, and the other end of which is disposed in the open slot and rotatably connected to the open slot.

[0012] Preferably, the base is T-shaped, with two fixing through holes on the upper portion and a guiding slide groove in the middle portion, fixing nails are provided on the through holes, and the fixing wheels are provided on the fixing nails.

[0013] Preferably, the sensor is in the shape of a stepped column, with a raised middle portion and a cable interface, and threads at both ends.

[0014] Preferably, the top of the moving wheel is an arc, the lower part is provided with a threaded blind hole, and the middle part is a guide block.

[0015] Preferably, the fixing wheel is a hollow cylinder, one end of which is screwed to closely contact the base surface.

[0016] Preferably, the rope is placed between the fixed wheel and the moving wheel. When the handle is turned, the moving wheel can slide along the slide groove, thereby squeezing the rope until the rope bends. The sensor measures the longitudinal compression force of the rope, and determines the rope tension based on the longitudinal compression force of the rope.

[0017] In a second aspect, the present application also provides a method for calculating rope tension, the method comprising:

[0018] Step 1, measuring the longitudinal compression force G of the rope;

[0019] Step 2, according to the vector characteristics of the force and the longitudinal compression force G of the rope, find the preliminary mathematical model of the rope tension F;

[0020] Step 3, based on the preliminary mathematical model, improve the parameters of contact angle, wrap angle of the driving wheel, wrap angle of the fixed wheel, rope separation point, and rope diameter, and construct a detailed tension calculation mathematical model;

[0021] Step 4: Based on the detailed tension calculation mathematical model in step 3, derive the cable tension calculation formula

[0022]

[0023] Among them, G is the longitudinal compression force of the rope; R is the radius of the driving wheel; X is the displacement of the driving wheel from the initial position to the final position; L is the distance between the fixed wheel axis; D is the diameter of the steel cable; M is the vertical distance between the driving wheel and the fixed wheel axis, which is a vector value. When the driving wheel axis is above the fixed wheel axis, it is a positive value, and when the driving wheel axis is below the fixed wheel axis, it is a negative value.

[0024] Step 5, measuring the actual L value; measuring the cable diameter D value; measuring the moving wheel radius R value; measuring the M value; measuring the displacement X value of the moving wheel from the initial position to the final position;

[0025] Step 6, substitute the actual L, R, D, X, M, G values ​​into the formula in step 4 to calculate the cable tension value.

[0026] Preferably, the measuring of the longitudinal compression force of the rope comprises:

[0027] Complete the assembly of the rope tension measuring device;

[0028] Turn the handle counterclockwise to retract the moving wheel until the rope can be smoothly put into the gap between the fixed wheel and the moving wheel;

[0029] Turn the handle clockwise and press it into the "dead zone" to extend the moving wheel and tighten the rope;

[0030] The longitudinal compression force of the rope is read out according to the sensor value.

[0031] Beneficial technical effects of this application:

[0032] The present invention provides a rope tension measuring device and a tension calculation method thereof. The device has a simple structure, is easy to use and maintain, and is small in size, light in weight, and easy to carry. It is suitable for use in various occasions and application scenarios such as production and manufacturing and after-sales troubleshooting.

[0033] The calculation method can quickly and accurately measure the cable and rope tension values, and provide quantitative parameter values ​​for the cable and rope tension values ​​and for the cable tension adjustment.

[0034] This calculation method is independently derived and is the core of the rope tension measuring device. The steel cable tension measuring device developed based on this algorithm uses all domestically produced components, which facilitates maintenance and low-cost control during later use, while also achieving domestic substitution of imported tension measuring devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the external structure of a rope tension measuring device provided in an embodiment of the present application;

[0036] Figure 2 It is a schematic diagram of the internal structure of a rope tension measuring device provided in an embodiment of the present application;

[0037] Figure 3 This is a tension measurement schematic diagram of a rope tension measurement device provided in an embodiment of the present application;

[0038] Figure 4 It is a preliminary mathematical model for tension calculation provided in the embodiment of the present application;

[0039] Figure 5 It is a detailed mathematical model for tension calculation provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] See also Figure 1 , Figure 2 and Figure 3 The present invention designs a rope tension measuring device, proposes a corresponding method of use in combination with the device, and also provides a domestic alternative to imported equipment.

[0041] Among them, the base 1 is in a "T" shape as a whole, with a "I"-shaped slide groove designed in the middle, which plays a guiding role when the moving wheel 5 slides. There are small holes next to the groove for fixing the rocker arm 7 and the housing 4. The outside of the groove is a frame-type structure, which encapsulates the entire mechanism in the frame. Two mounting holes for the fixed wheel 2 are opened on the crossbeam of the "T"-shaped base; the fixed wheel 2 is a circular columnar structure, which is screwed to the base 1 through a fixing nail 3; the fixing nail 3 is used to fix the base 1 and the fixed wheel 2.

[0042] Among them, the shell 4 is a frame structure with a straight-line slide groove in the middle, which plays a guiding role when the moving wheel 5 slides. Three screw fixing holes are opened on the upper surface for fixing the shell 4 and the base 1; the moving wheel 5 is approximately in a capsule shape, with raised guide pins on the upper and lower surfaces. The guide pins enable the moving wheel 5 to slide linearly along the slide grooves on the base 1 and the shell 4, and the arc surface of the moving wheel 5 is used for lifting the rope.

[0043] Furthermore, the handle 6 is a "Y"-shaped structure, the upper end of the structure is screwed to the transfer arm 8 through the fixing nail 3, the middle part is screwed to the rocker arm 7 through the fixing nail 3, and the other end is a pressing end for manual operation; the rocker arm 7 is "L"-shaped, and screw connection holes are designed at the corners and tip of the "L". The screw holes at the corners of the rocker arm are connection holes for compensation adjustment. When installed and used, generally only the two connection holes at the tip of the rocker arm are used, and one end of the tip of the rocker arm is connected in series and in contact with the bushing 10 through the connection hole; one end of the transfer arm 8 is screwed to the sensor 9, and the other end is screwed to the "Y"-shaped double ears on the rocker arm 7 through a single ear; the sensor 9 is "middle"-shaped, with screw piles at both ends, one end is screwed to the transfer arm 8, and the other end is screwed to the moving wheel 5. There is a cable interface in the middle, which is not shown in this figure; the bushing 10 is a circular columnar structure, which is screwed to the base 1 and the shell 4 through the fixing nail 3.

[0044] In other embodiments of the present application, the steps of the method for using the rope tension measuring device provided by the present application are as follows:

[0045] The first step is to follow Figure 1 and Figure 2 Complete the assembly of the rope tension measuring device;

[0046] The second step is to rotate the handle 6 counterclockwise to retract the moving wheel 5 until the rope 11 can be smoothly inserted into the gap between the fixed wheel 2 and the moving wheel 5;

[0047] The third step is to rotate the handle 6 clockwise and press it into the "dead zone" to extend the moving wheel 5 and tighten the rope 11;

[0048] The fourth step is to read the force data of the rope according to the sensor value;

[0049] The fifth step is to calculate the tension value of the rope according to the mechanical vector correction formula.

[0050] The present invention provides a simple, practical, concise and efficient rope tension measuring device and method. The device has a simple structure, is easy to use and maintain, and is small in size, light in weight and easy to carry. It is suitable for use in various occasions and application scenarios such as production and manufacturing and after-sales troubleshooting.

[0051] In other embodiments of this application, please refer to Figure 4 and Figure 5 The present invention proposes a method for calculating the tension of cables and ropes, which can be used to quickly and accurately measure the tension values ​​of cables and ropes, and provide quantitative adjustment parameter values ​​for adjusting the tension values ​​of cables and ropes.

[0052] The present application provides a mathematical model for calculating the tension of a cable or rope, and the model includes a fixed wheel 2 and a moving wheel 5 , and a cable or rope 11 .

[0053] The present application provides a preliminary mathematical model of a method for calculating the tension of a cable or rope, which is a mathematical model for contact-type tension measurement; a fixed wheel 1 is fixed on a tension measuring device; a moving wheel 2 is at the position of the lower moving wheel 2 or at the lower position of the moving wheel 2 before measuring the tension of the steel cable, so that the cable or rope 4 can be smoothly placed in the gap between the moving wheel 2 and the fixed wheel 1; when measuring the tension of the steel cable, the moving wheel 2 moves upward to the position of the moving wheel 3 under the action of corresponding components; the cable or rope 4 is basically flat in its initial position, and is pushed to the tangent point of the moving wheel 3 under the action of the components during measurement.

[0054] See also Figure 2 , Figure 3 , which is a perfected mathematical model and tension calculation method for the cable and rope tension calculation method.

[0055] Among them, F is the cable tension; G is the force reading displayed by the sensor; R is the radius of the sensor head; X is the distance the sensor moves; L is the distance between the fixed wheels; D is the cable diameter; M is the eccentricity between the initial center of the circle.

[0056] The calculation process of a method for calculating the tension of a cable or rope provided in this application is as follows:

[0057] The first step is to establish Figure 1 A preliminary mathematical model is used to indirectly calculate the rope tension based on the vector characteristics of the force.

[0058] The second step is, Figure 2 A detailed mathematical model for tension calculation is established, and on the basis of the preliminary mathematical model, the relationship between the parameters of the contact angle, the wrap angle of the moving wheel, the wrap angle of the fixed wheel, the rope separation point, and the rope diameter and this mathematical model is improved.

[0059] The third step is measurement. Measure the actual L, R, D, X, and M values ​​to reduce the impact of the deviation between the design theoretical value and the actual value on the measurement result.

[0060] The fourth step is to select the tension measurement position on the rope. When selecting the rope measurement position, the rope length at the measured part should be greater than L+40 mm.

[0061] Step 5: Figure 1 The rope 4 is placed between the fixed wheel 1 and the moving wheel 2.

[0062] Step 6: Reference Figure 1 Push the moving wheel 2 (initial position) to the moving wheel 3 (final position).

[0063] Step 7: Read the force value of G through the force sensor on the moving wheel 2.

[0064] The eighth step is the derivation of the rope tension method. Based on the established mathematical model, the rope tension calculation method is derived as follows: Figure 3 .

[0065] Step 9: Bring in the L, R, D, X, M, and G values Figure 3 method.

[0066] Step 10: Follow Figure 3 The rope tension value is calculated by this method.

[0067] The present invention provides a method for calculating the tension of cables and ropes and a mathematical model for calculation, which can be used to quickly and accurately measure the tension values ​​of cables and ropes, and provide quantitative adjustment parameter values ​​for the adjustment of the tension values ​​of cables and ropes. This method is independently derived and is the core calculation method in rope tension meters and automatic rope tension adjustment. With the derivation of this method, the steel cable tension automatic adjustment device and steel cable tension measurement device developed based on this method break the export restrictions of foreign rope tension measurement devices, and at the same time, a large number of imported equipment in the warehouse can be promoted and eliminated, and completely domestic components are used, which is convenient for maintenance and low-cost control during later use, and realizes the domestic substitution solution for imported products.

Claims

1. A rope tension measuring device, characterized in that: The device comprises: A base having a straight-shaped slideway and two fixed wheels; A moving wheel is installed in the slide groove, and the moving wheel can slide along the slide groove; A sensor, one end of which is connected to the moving wheel; A transfer arm, one end of which is connected to the other end of the sensor; The handle has an open slot, and the opening of the open slot is rotatably connected to the other end of the transfer arm; A rocker arm, one end of which is rotatably connected to the base, and the other end of which is disposed in the open slot and rotatably connected to the open slot.

2. The device according to claim 1, characterized in that The base is T-shaped, with two fixing through holes on the upper part and a guiding slide groove in the middle part. Fixing nails are arranged on the through holes, and the fixing wheels are arranged on the fixing nails.

3. The device according to claim 1, characterized in that The sensor is in the shape of a stepped column, with a raised middle portion and a cable interface, and threads at both ends.

4. The device according to claim 1, characterized in that The top of the moving wheel is an arc, the lower part is provided with a threaded blind hole, and the middle part is a guide block.

5. The device according to claim 2, characterized in that The fixed wheel is a hollow cylinder, one end of which is screwed and closely attached to the base surface.

6. The device according to claim 1, characterized in that A rope is placed between the fixed wheel and the moving wheel. When the handle is turned, the moving wheel can slide along the slide groove, thereby squeezing the rope until the rope bends. The sensor measures the longitudinal compression force of the rope, and the rope tension is determined based on the longitudinal compression force of the rope.

7. A method for calculating rope tension, characterized in that: The method comprises: Step 1, measuring the longitudinal compression force G of the rope; Step 2, according to the vector characteristics of the force and the longitudinal compression force G of the rope, find the preliminary mathematical model of the rope tension F; Step 3, based on the preliminary mathematical model, improve the parameters of contact angle, wrap angle of the driving wheel, wrap angle of the fixed wheel, rope separation point, and rope diameter, and construct a detailed tension calculation mathematical model; Step 4: Based on the detailed tension calculation mathematical model in step 3, derive the cable tension calculation formula Among them, G is the longitudinal compression force of the rope; R is the radius of the driving wheel; X is the displacement of the driving wheel from the initial position to the final position; L is the distance between the fixed wheel axis; D is the diameter of the steel cable; M is the vertical distance between the driving wheel and the fixed wheel axis, which is a vector value. When the driving wheel axis is above the fixed wheel axis, it is a positive value, and when the driving wheel axis is below the fixed wheel axis, it is a negative value. Step 5, measuring the actual L value; measuring the cable diameter D value; measuring the moving wheel radius R value; measuring the M value; measuring the displacement X value of the moving wheel from the initial position to the final position; Step 6, substitute the actual L, R, D, X, M, G values ​​into the formula in step 4 to calculate the cable tension value.

8. The method according to claim 7, characterized in that The measuring of the longitudinal compression force of the rope comprises: Complete the assembly of the rope tension measuring device; Turn the handle counterclockwise to retract the moving wheel until the rope can be smoothly put into the gap between the fixed wheel and the moving wheel; Turn the handle clockwise and press it into the "dead zone" to extend the moving wheel and tighten the rope; The longitudinal compression force of the rope is read out according to the sensor value.

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