Tool for measuring circumferential curve

Abstract

The utility model discloses a tool for measuring a circumferential curve. The tool comprises a first vertical scale, a second vertical scale, a third vertical scale, a transverse scale, a first driving rod and a second driving rod, strip-shaped through holes are respectively formed in the middle parts of the first vertical scale, the second vertical scale and the third vertical scale along the axial direction; the first vertical scale is vertically installed at the front end of the transverse scale through a limiting block, the right side edge of the first vertical scale is flush with the zero scale of the transverse scale, and the second vertical scale and the third vertical scale are sequentially and vertically installed on the transverse scale from front to back through a first sliding limiting block and a second sliding limiting block. The first sliding limiting block and the second sliding limiting block can move left and right in the length direction of the transverse ruler. The device can quickly and accurately measure the chord height and chord length of a circumferential curve, further can quickly calculate the arc length, the curve radius and the curve corresponding angle of the circumferential curve, reflects specific parameters of a sphere or a plane circle in detail, and provides a basis for calculating the characteristics of a circumferential curved surface.

Description

Technical Field

[0001] The utility model belongs to the technical field of measurement, and in particular relates to a tool used for measuring circular curves. Background Art

[0002] At present, the tools for measuring curves include a curve ruler, or a graduated ruler combined with a compass and a ruler to measure the length of a plane or spherical circumference curve. The curve ruler measurement has a large error, which is easy to cause large deviations during the use of data; at the same time, the traditional measurement tools are complicated to operate, and the measurement workload is large for working conditions that require multiple measurements; in addition, the measurement data of traditional measurement tools is single, mainly point-to-point data, and cannot form a system series of data, which cannot meet the working conditions with high requirements for system measurement parameters. Utility Model Content

[0003] The utility model aims to provide a tool for measuring circular curves, so as to solve the technical problems of large measurement error, complicated measurement operation of combined tools and single measurement data existing in the existing curve ruler measurement tools.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A tool for measuring a circular curve, comprising a first vertical ruler, a second vertical ruler, a third vertical ruler, a transverse ruler, a first driving rod and a second driving rod; wherein the middle parts of the first vertical ruler, the second vertical ruler and the third vertical ruler are respectively provided with strip-shaped through holes along the axial direction; the first vertical ruler is vertically mounted on the front end of the transverse ruler through a limit block and its right side is flush with the zero scale of the transverse ruler, the second vertical ruler and the third vertical ruler are vertically mounted on the transverse ruler from front to back through a first sliding limit block and a second sliding limit block in sequence, and the first sliding limit block and the second sliding limit block can both move left and right along the length direction of the transverse ruler; the first vertical ruler, the second vertical ruler and the third vertical ruler respectively pass through the vertical slots provided on the corresponding limit blocks and can move up and down along the slots; the ruler tips at the lower ends of the first vertical ruler, the second vertical ruler and the third vertical ruler are respectively arranged on the right side, the center line and the left side of the rulers;

[0006] The first driving rod and the second driving rod are arranged on the same side of the horizontal scale, and the two have the same length; the two ends of the first driving rod are respectively installed on the bar-shaped through holes of the first vertical scale and the second vertical scale through pins, and the two ends can slide along the two bar-shaped through holes respectively and can be tightened and fixed by pins; the two ends of the second driving rod are respectively installed on the bar-shaped through holes in the middle of the second vertical scale and the third vertical scale through pins, and the two ends can slide along the two bar-shaped through holes respectively and can be tightened and fixed by pins, and the second driving rod and the first driving rod share the same pin at their fixed ends on the second vertical scale.

[0007] Furthermore, the limit block, the first sliding limit block, the second sliding limit block and the transverse scale are all connected by slots.

[0008] Furthermore, the dimensions of each component are as follows:

[0009] First vertical ruler: 200mm long, 15mm wide, 8mm thick, 190mm scale;

[0010] Second vertical ruler: 320mm long, 15mm wide, 8mm thick, 310mm scale;

[0011] The third vertical ruler: 200mm long, 15mm wide, 8mm thick, 190mm scale;

[0012] Horizontal ruler: length 300mm, width 40mm, thickness 8mm, scale 260mm;

[0013] Limit block, first sliding limit block and second sliding limit block: 50mm long, 25mm wide and 15mm thick.

[0014] Furthermore, a special calculator is installed at the rear end of the transverse scale, and the special calculator adopts a control chip with a shell.

[0015] Furthermore, the special calculator and the ruler are connected by a slot.

[0016] Furthermore, the dimensions of the dedicated calculator are: 60 mm in length, 60 mm in width, and 20 mm in thickness.

[0017] The utility model is also characterized in that:

[0018] (1) Modular design. The main components and driving components include: a first vertical scale 1, a second vertical scale 2, a third vertical scale 3, a horizontal scale 4, a driving rod, a limit block, a first sliding limit block 7, and a second sliding limit block 8. It can be freely disassembled and easy to use and maintain, solving the problem of complex measurement operation of existing measuring tools.

[0019] (2) Accurate positioning. The third vertical scale 3 and the second vertical scale 2 are driven by two driving rods of equal length and a sliding stop block, so that the second vertical scale 2 is located in the middle of the first vertical scale 1 and the third vertical scale 3, thereby ensuring the accuracy of the measurement of the second vertical scale 2.

[0020] (3) A special calculator with built-in conventional calculation formulas is used. By inputting the measured chord length and chord height into the special calculator, the circular curve parameters can be calculated using the built-in conventional calculation formulas.

[0021] (4) High precision. It is used to measure chord length ≤ 260mm, with a minimum measurement accuracy of 1mm, which can meet the requirements of physical measurement for inspection and maintenance.

[0022] (5) Convenient operation. Manual operation, easy adjustment, simple and practical.

[0023] In summary, the utility model can quickly and accurately measure the chord height and chord length of a circular curve, and then quickly calculate the arc length, curve radius, and corresponding angle of the circular curve, and reflect the specific parameters of the sphere or plane circle in detail, providing a basis for calculating the characteristics of the circular surface. It effectively solves the circular curve measurement problems involved in inspection and maintenance, drawing drawings, spare parts repair, etc., with simple operation, high measurement accuracy, and fast and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model;

[0025] Figure 2 It is a structural schematic diagram of an embodiment of the utility model;

[0026] Figure 3 It is a schematic diagram of the dimensions of the main components of the utility model;

[0027] Figure 4 It is a schematic diagram of the calculation principle.

[0028] The present invention is further explained below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0029] like Figure 1 As shown, the tool for measuring a circular curve provided by the utility model comprises a first vertical scale 1, a second vertical scale 2, a third vertical scale 3, a transverse scale 4, a first driving rod 5 and a second driving rod 9; wherein the middle parts of the first vertical scale 1, the second vertical scale 2 and the third vertical scale 3 are respectively provided with a strip through hole along the axial direction; the first vertical scale 1 is vertically mounted at the front end of the transverse scale 4 through a limit block and its right side is flush with the zero scale of the transverse scale 4; the second vertical scale 2 and the third vertical scale 3 are arranged from front to back The first sliding limit block 7 and the second sliding limit block 8 are sequentially vertically installed on the horizontal scale 4, and the first sliding limit block 7 and the second sliding limit block 8 can move left and right along the length direction of the horizontal scale 4; the first vertical scale 1, the second vertical scale 2, and the third vertical scale 3 respectively pass through the vertical slots provided on the corresponding limit blocks, and can move up and down along the slots; the ruler tips at the lower ends of the first vertical scale 1, the second vertical scale 2, and the third vertical scale 3 are respectively arranged on the right side, the center line, and the left side of the same;

[0030] The first driving rod 5 and the second driving rod 9 are arranged on the same side of the horizontal scale 4, and the two have the same length; the two ends of the first driving rod 5 are respectively installed on the bar-shaped through holes of the first vertical scale 1 and the second vertical scale 2 by pins, and the two ends can slide along the two bar-shaped through holes respectively and can be tightened and fixed by pins; the two ends of the second driving rod 9 are respectively installed on the bar-shaped through holes in the middle of the second vertical scale 2 and the third vertical scale 3 by pins, and the two ends can slide along the two bar-shaped through holes respectively and can be tightened and fixed by pins, and the second driving rod 9 and the first driving rod 5 share the same pin at the fixed end on the second vertical scale 2.

[0031] Preferably, the limit block 6, the first sliding limit block 7, the second sliding limit block 8 and the horizontal scale 4 are all connected by slots; the second drive rod 9 and the first vertical scale 1, the second drive rod 9 and the second vertical scale 2, the first drive rod 5 and the second vertical scale 2, and the first drive rod 5 and the third vertical scale 3 are all connected by pins.

[0032] Preferably, a dedicated calculator 10 is installed at the rear end of the transverse scale 4. The dedicated calculator 10 uses a control chip with a housing. The control chip is preloaded with a mathematical calculation formula of the parameter to be measured. The arc length, radius, and corresponding center angle of the measured curve can be automatically calculated by inputting the chord length and chord height values ​​on the dedicated calculator 10. Preferably, the dedicated calculator 10 and the scale 4 are connected by a slot.

[0033] Preferably, the dimensions of each component are as follows:

[0034] First vertical ruler 1: 200mm long, 15mm wide, 8mm thick, 190mm scale;

[0035] Second vertical scale 2: length 320mm, width 15mm, thickness 8mm, scale 310mm;

[0036] The third vertical ruler 3: 200mm long, 15mm wide, 8mm thick, 190mm scale;

[0037] Horizontal ruler 4: length 300mm, width 40mm, thickness 8mm, scale 260mm;

[0038] Special calculator 10: length 60mm, width 60mm, thickness 20mm;

[0039] Limit block: 50mm long, 25mm wide, 15mm thick.

[0040] The use process of the tool of the utility model comprises the following steps:

[0041] Step 1: Preparation and measurement.

[0042] (1) Turn on the measuring tool, and adjust the first vertical scale 1 and the third vertical scale 3 so that the tips of the lower ends are on the same horizontal line, and the distance between the first vertical scale 1 and the third vertical scale 3 is roughly close to the chord length, so as to reduce the adjustment range; at this time, tighten the pins at both ends of the first driving rod 5 and the second driving rod 9 so that the relative positions of the connections between the first driving rod 5 and the scale 1, and the second driving rod 9 and the scale 3 are fixed, and the first driving rod 5, the second driving rod 9 and the vertical scales connected to them can rotate;

[0043] (2) Pull the second sliding stopper 8 left and right until the lower tips of the first vertical scale 1 and the third vertical scale 3 coincide with the two end points of the circular curve to be measured respectively; at this time, adjust the second vertical scale 2 to move up and down until the lower tips thereof are flush with the lower tips of the first vertical scale 1 and the third vertical scale 3; at this time, tighten the common pin of the first driving rod 5, the second driving rod 9 and the second vertical scale 2, so that the relative positions of the connections between the first driving rod 5, the second driving rod 9 and the scale 2 are fixed, and the first driving rod 5, the second driving rod 9 and the scale 2 can rotate;

[0044] (3) When the second sliding stopper 8 is pulled, the first driving rod 5 and the second driving rod 9 are driven, and the first sliding stopper 7 is linked. At this time, the scale at the intersection of the second vertical scale 2 and the circular curve is used as the chord height, and the overlap value of the left side of the second sliding stopper 8 and the scale on the horizontal scale 4 is the chord length;

[0045] (4) Based on the obtained chord length and chord height values, the operator calculates the arc length, radius, and corresponding center angle of the curve to be measured. The calculation can also be performed automatically by a dedicated calculator 10.

[0046] The schematic diagram of the calculation principle is as follows Figure 4 As shown, point O is the center of arc AB, OA and OB are the radii of arc AB, that is, radius r;

[0047] AB is the length of the chord corresponding to the arc AB, that is, the length of the line segment AB, that is, the chord length L;

[0048] DC is the chord height corresponding to arc AB, that is, the length of the intersection of the perpendicular bisector of arc AB through point D (the midpoint of line segment AB) and the arc through point D is the chord height H.

[0049] Arc AB is the length of the arc between points A and B on the plane or sphere to be measured, that is, arc length C;

[0050] The central angle is the angle corresponding to the arc AB passing through the center point O, that is, the corresponding central angle a;

[0051] The calculation formulas for each parameter are as follows:

[0052] r 2=(rH) 2 +(L / 2) 2

[0053] r 2 =r 2 -2*r*H+H 2 +L 2 / 4

[0054] 2*r*H=H 2 +L 2 / 4

[0055] r=H / 2+L 2 / (8*H)

[0056] a=2*{arcsin(L / 2 / r)}*π / 180

[0057] C=a*r=2*{arcsin(L / 2 / r)}*π / 180*{H / 2+L 2 / (8*H)}.

[0058] Step 2, reset the measuring tool.

[0059] (1) The second sliding limit block 8 is adjusted to move toward the first sliding limit block 7, and the first driving rod 5 and the second driving rod 9 drive the first sliding limit block 7 until the limit block 6, the first sliding limit block 7, and the second sliding limit block 8 are close to each other;

[0060] (2) Loosen the common pin of the first driving rod 5, the second driving rod 9 and the second vertical scale 2, so that the second vertical scale 2 can move freely up and down. At this time, adjust the second vertical scale 2 in the vertical direction until its lower end tip is on the same horizontal line as the lower end tips of the first vertical scale 1 and the third vertical scale 3. After adjustment, it is easy to store.

Claims

1. A tool for measuring a circular curve, characterized in that: The invention comprises a first vertical scale (1), a second vertical scale (2), a third vertical scale (3), a transverse scale (4), a first driving rod (5) and a second driving rod (9); wherein the middle parts of the first vertical scale (1), the second vertical scale (2) and the third vertical scale (3) are respectively provided with strip-shaped through holes along the axial direction; the first vertical scale (1) is vertically mounted on the front end of the transverse scale (4) through a limit block and its right side is flush with the zero scale of the transverse scale (4); the second vertical scale (2) and the third vertical scale (3) are moved from front to back through the first sliding limit block The first sliding limit block (7) and the second sliding limit block (8) are vertically mounted on the transverse scale (4) in sequence, and the first sliding limit block (7) and the second sliding limit block (8) can both move left and right along the length direction of the transverse scale (4); the first vertical scale (1), the second vertical scale (2) and the third vertical scale (3) respectively pass through the vertical slots provided on the corresponding limit blocks, and can move up and down along the slots; the ruler tips at the lower ends of the first vertical scale (1), the second vertical scale (2) and the third vertical scale (3) are respectively arranged on the right side, the center line and the left side of the scale; The first driving rod (5) and the second driving rod (9) are arranged on the same side of the horizontal scale (4), and the two have the same length; the two ends of the first driving rod (5) are respectively installed on the bar-shaped through holes of the first vertical scale (1) and the second vertical scale (2) through pins, and the two ends can slide along the two bar-shaped through holes and can be tightened and fixed by the pins; the two ends of the second driving rod (9) are respectively installed on the bar-shaped through holes in the middle of the second vertical scale (2) and the third vertical scale (3) through pins, and the two ends can slide along the two bar-shaped through holes and can be tightened and fixed by the pins, and the second driving rod (9) and the first driving rod (5) share the same pin at their fixed ends on the second vertical scale (2).

2. The tool for measuring a circular curve according to claim 1, characterized in that: The limit block (6), the first sliding limit block (7), the second sliding limit block (8) and the transverse scale (4) are all connected by slots.

3. The tool for measuring a circular curve according to claim 1 or 2, characterized in that: The dimensions of each component are as follows: First vertical ruler (1): 200 mm long, 15 mm wide, 8 mm thick, with a scale of 190 mm; Second vertical ruler (2): length 320 mm, width 15 mm, thickness 8 mm, scale 310 mm; The third vertical ruler (3): 200 mm long, 15 mm wide, 8 mm thick, with a scale of 190 mm; Horizontal ruler (4): length 300 mm, width 40 mm, thickness 8 mm, scale 260 mm; The limit block (6), the first sliding limit block (7) and the second sliding limit block (8) are 50 mm long, 25 mm wide and 15 mm thick.

4. The tool for measuring a circular curve according to claim 1 or 2, characterized in that: A special calculator (10) is also installed at the rear end of the transverse scale (4), and the special calculator (10) adopts a control chip with a housing.

5. The tool for measuring a circular curve according to claim 4, characterized in that: The special calculator (10) and the ruler (4) are connected by a slot.

6. The tool for measuring a circular curve according to claim 5, characterized in that: Dimensions of the special calculator (10): length 60 mm, width 60 mm, thickness 20 mm.

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