A reference vertical calibration and slide rail circle setting auxiliary drawing device

Abstract

The utility model discloses a kind of benchmark vertical calibration and slide rail fixed circle auxiliary plotter. Vertical calibration main ruler is placed horizontally on drawing paper with scale being equipped, main stick is vertically fixed on vertical calibration main ruler, rotating support is sleeved on main stick for adjusting rotation angle around main stick, rotating support is L-shaped structure, one side of L-shaped is sleeved on main stick, the other side is connected to compass main arm, compass main arm is perpendicular to drawing paper, compass main arm is slidably installed on rotating support along the direction parallel to drawing paper, for determining the center of circle, the radius adjustment slide rail is slidably sleeved on compass main arm along the length direction of compass main arm, scale is equipped on radius adjustment slide rail, swing arm is slidably installed on radius adjustment slide rail along the direction parallel to drawing paper, for clamping drawing pen to draw circle and adjusting the radius of drawing circle. The utility model solves the problem of line deviation, center of circle sliding and low positioning efficiency caused by the inexperience of beginner.

Description

Technical Field

[0001] This utility model relates to the field of engineering drawing tools, specifically to a reference vertical calibration and slide rail circle-fixing auxiliary plotter. Background Technology

[0002] Beginners in engineering drawing often encounter problems due to insufficient hand control and unfamiliarity with tool operation, such as compass slippage leading to center offset, low accuracy in straight line positioning, and skewed or distorted lines. Traditional tools like T-squares require manual alignment of the baseline and repeated fixing, especially when drawing the junction of straight lines and arcs, involving numerous steps and prone to errors due to tool displacement. In existing tools, the compass and ruler functions are independent, unable to simultaneously achieve straight line baseline positioning and stable center adjustment, resulting in frequent tool changes and deviation corrections during the drafting process, reducing efficiency and affecting drawing quality. Therefore, there is an urgent need for an integrated tool that can simultaneously provide rapid straight line positioning and anti-slip center adjustment to simplify the operation process and improve drafting stability. Utility Model Content

[0003] This utility model is a reference vertical calibration and slide rail circle-fixing auxiliary drawing device for beginners in engineering drawing. Specifically, it is an integrated ruler and compass device, consisting of three main modules: a vertical calibration ruler, a rotary rail positioning module, and an anti-slip slide rail compass. It is designed to solve the problems of line deviation, circle center slippage, and low positioning efficiency caused by unstable hand movements in engineering drawing beginners.

[0004] In order to improve and solve the problems existing in the background art, the technical solution adopted by this utility model is as follows: This utility model includes a vertical calibration main scale, a main bar, a rotating bracket, a compass main arm, a radius adjustment slide rail, and a movable arm; The vertical calibration main scale has graduations and is placed horizontally on the drawing. The main rod is vertically fixed to the vertical calibration main scale. The rotating bracket has an L-shaped structure, with one side of the L-shape fitted onto the main rod and the other side serving as a rotating connecting shaft connected to the compass main arm. This is used to adjust the rotation angle of the compass main arm around the main rod. The compass main arm is set perpendicular to the drawing and is slidably mounted on the rotating bracket along the length of the rotating connecting shaft. This is used to determine the center of the drawn arc. The radius adjusting slide rail is slidably fitted onto the compass main arm along the length of the compass main arm and has graduations. The movable arm is slidably mounted on the radius adjusting slide rail along the length of the radius adjusting slide rail and is used to hold the drawing pen to draw the arc and adjust the radius of the drawn arc.

[0005] It also includes an auxiliary ruler. The vertical calibration main ruler has an L-shaped structure. An L-shaped groove is provided on the inner side of the L-shaped corner of the lower end face of the vertical calibration main ruler. The auxiliary ruler is slidably embedded in the L-shaped groove.

[0006] The lower end face of the vertical calibration main scale is provided with a suction cup groove and a silicone suction cup is installed in the suction cup groove for adsorbing and fixing the vertical calibration main scale. The vertical calibration main scale has a threaded hole at the L-shaped corner as a ruler-gauge connection screw, and is fixedly connected to the main rod thread through the ruler-gauge connection screw.

[0007] The upper end of the compass main arm is provided with an anti-slip knob, and a limit disc is fixedly installed on the compass main arm below the anti-slip knob to prevent the compass main arm from coming off the rotating bracket. The lower end of the compass main arm has a tapered structure.

[0008] A limiting component is slidably mounted on the rotating connecting shaft along its length. The limiting component has a through hole that serves as a main arm slot. The rotating connecting shaft is parallel to the drawing and has a guide opening along its length. The compass main arm passes through the main arm slot from top to bottom and is slidably mounted on the rotating bracket through the guide opening. The limiting disc on the compass main arm is in contact with the main arm slot. The limiting component is used to keep the compass main arm vertical.

[0009] One end of the radius adjustment slide rail is an openable clamp structure. The openable clamp structure has a slot along the length of the radius adjustment slide rail. The main arm of the compass passes through the slot. The slide rail fastening port is set on both sides of the slot. The screw passes horizontally through the slide rail fastening port and forms a threaded engagement with the nut. The radius adjustment slide rail has an inner slide rail and a scale on one side wall.

[0010] The boom includes an L-shaped fastening slider, a scale indicator, and a pencil holder slot arranged sequentially from top to bottom. One side of the L-shaped fastening slider is parallel to the drawing, and the other side of the L-shaped fastening slider is fitted with a slider fastening screw. One end of the slider fastening screw passes through the L-shaped fastening slider and is used to connect to the outer wall of the radius adjustment slide rail. The middle part of the scale indicator is embedded in the inner slide of the radius adjustment slide rail. Both horizontal ends of the scale indicator extend out of the inner slide rail and are connected to a triangular pyramid structure at the end of the radius adjustment slide rail with the scale side wall. The upper end of the scale indicator extends out of the inner slide rail and is fixedly connected to the lower end face of the L-shaped fastening slider. The lower end of the scale indicator extends out of the inner slide rail and is fixedly connected to the pencil holder slot. The pencil holder slot is a hollow cylindrical structure for inserting a drawing pen, and a boom fastening screw is provided on its side. The boom fastening screw passes into the pencil holder slot and is used to connect to the outer circumference of the drawing pen.

[0011] The rotating support is mounted on the main rod via a fluororubber O-ring.

[0012] The beneficial effects of this utility model are: This invention is particularly suitable for engineering drawing scenarios that require rapid drawing of reference vertical lines, accurate positioning of coordinates, and stable drawing of arcs with different radii. By connecting the compass with the rotating bracket, the compass can be kept perpendicular to the paper. Combined with the parallel arm design of the compass main arm and the movable arm, it solves the technical problems of inaccurate positioning of extremely small radii and center offset when drawing large radii caused by the sliding of the support legs of traditional compasses. At the same time, it overcomes the defect of easy angular deviation when drawing vertical lines with a ruler, and the radius adjustment slide rail can realize the visual adjustment of the radius.

[0013] This invention uses a vertically calibrated main ruler to align with the baseline, functioning as a ruler. When used with an auxiliary ruler, it eliminates the need for repeated alignment with the baseline, reducing drawing errors. By combining a compass with the vertically calibrated main ruler and auxiliary ruler, the center of the circle can be directly positioned on the drawing paper when adjusting its position, eliminating the need for repeated tool switching. This achieves efficient and convenient coordinate positioning, allowing for quick location of the required drawing points and measurement of drawing lengths. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an embodiment of the present utility model.

[0015] Figure 2 This is a detailed view of the vertical calibration main scale in an embodiment of this utility model.

[0016] Figure 3 This is a detailed view of the radius adjustment slide rail and boom in the embodiment of this utility model.

[0017] Figure 4 This is a schematic diagram illustrating the use of the vertical calibration main scale and auxiliary scale in this embodiment of the utility model.

[0018] Figure 5 This is a schematic diagram illustrating the overall usage of an embodiment of this utility model.

[0019] In the diagram: 1-Vertical calibration main scale, 12-Scale and compass connection screw, 13-Suction cup slot, 14-L-shaped groove, 2-Main rod, 3-Rotating bracket, 4-Compass main arm, 42-Anti-slip knob, 6-Radius adjustment slide rail, 62-Slide rail fastening port, 7-Moving arm, 71-Scale indicator, 72-Slider fastening screw, 73-L-shaped fastening slider, 74-Moving arm fastening screw, 75-Pencil clamping slot, 8-Limiting assembly. Detailed Implementation

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0021] plotters such as Figure 1As shown, it includes a vertical calibration main scale 1, a main rod 2, a rotating support 3, a compass main arm 4, a radius adjustment slide rail 6, and a movable arm 7.

[0022] The vertical calibration main scale 1 has graduations and is placed horizontally on the drawing for positioning on the drawing. The main rod 2 is vertically fixed to the vertical calibration main scale 1. The rotating bracket 3 is fitted onto the main rod 2 to adjust the rotation angle of the compass arm 4 around the main rod 2. The rotating bracket 3 has an L-shaped structure, with one side fitted onto the main rod 2 and the other side serving as a rotating connecting shaft connected to the compass arm 4. The rotating connecting shaft is set parallel to the drawing, and the compass arm 4 is set perpendicular to the drawing. The compass arm 4 is slidably mounted on the rotating bracket 3 along the length direction of the rotating connecting shaft, i.e., perpendicular to the length direction of the compass arm 4, to determine the center of the drawn arc. The radius adjusting slide rail 6 is slidably fitted onto the compass arm 4 along the length direction of the compass arm 4. The radius adjusting slide rail 6 has graduations. The movable arm 7 is slidably mounted on the radius adjusting slide rail 6 along the length direction of the radius adjusting slide rail 6, i.e., perpendicular to the length direction of the compass arm 4, to hold the drawing pen to draw the arc and adjust the radius of the drawn arc.

[0023] It also includes an auxiliary ruler. The vertical calibration main ruler 1 has an L-shaped structure. An L-shaped groove 14 is provided on the inner side of the L-shaped corner of the lower end face of the vertical calibration main ruler 1. The auxiliary ruler is slidably embedded in the L-shaped groove 14 with a vertical deviation of ≤±0.5°. It is used to quickly draw an auxiliary straight line that is perpendicular to the reference edge of the main ruler by moving the auxiliary ruler back and forth, so as to ensure the accuracy and convenience of drawing.

[0024] By working in conjunction with an external auxiliary ruler, it enables rapid baseline fixing, vertical calibration, and two-dimensional positioning, effectively solving the problems of beginners having difficulty maintaining accurate vertical angles when manually drawing vertical lines, needing to repeatedly adjust baseline alignment, and the low efficiency of step-by-step positioning of two-dimensional coordinates.

[0025] The vertical calibration main scale 1 uses a right-angled trapezoidal bevel integrated scale for easy dimension calibration.

[0026] The inner wall of the L-shaped groove 14 is provided with cross knurling and silicone damping strips to stabilize the sliding of the auxiliary ruler. After the auxiliary ruler slides to the target scale, the position is locked by the silicone damping strips, and the dual-dimensional coordinate error is ≤1mm.

[0027] The vertical calibration main scale 1 (graduation value 1mm) achieves baseline coupling and two-dimensional coordinate positioning through the L-shaped orthogonal structure and the auxiliary positioning scale. The guide groove of the main scale is equipped with cross knurling (depth 0.1mm) and silicone damping strip (Shore hardness 40A) to form an anti-slip locking mechanism with an operating error of ≤1mm.

[0028] like Figure 2As shown, the L-shaped groove 14 of the vertical calibration main scale 1 is 8mm wide and 2mm high, and its sidewall has a cross knurling depth of 0.1mm. The upper arm is attached with a silicone damping strip to form a friction resistance locking structure with the auxiliary scale, and the operation error is ≤1mm. The vertical calibration main scale 1 is made of iron material and is adapted to an auxiliary scale with a thickness of 1.5-2mm. The elastic gap compensates for the manufacturing tolerance. Figure 2 The image in the upper right corner is a side view of one end of the vertical calibration main scale 1.

[0029] The lower end face of the vertical calibration main scale 1 is provided with a suction cup groove 13 and a silicone suction cup is installed in the suction cup groove 13 for adsorbing and fixing the vertical calibration main scale 1.

[0030] like Figure 2 As shown, the suction cup groove 13 is specifically a stepped hole with a diameter of 20mm and a depth of 5mm. A silicone suction cup (20mm in diameter and 3mm in thickness) is embedded in the stepped hole. In use, first align the side of the main ruler with the baseline of the drawing, then press the main ruler vertically to make the suction cup fit tightly against the table. The negative pressure adsorption force is used to firmly fix the main ruler to the baseline.

[0031] In this embodiment, the silicone suction cup has a diameter of 20mm and a thickness of 3mm. After pressing, the adsorption force is ≥20N, and the displacement after fixing the baseline is ≤0.5mm.

[0032] The vertical calibration main scale 1 has a vertical threaded hole at the L-shaped corner as a ruler-gauge connection screw 12, and is rigidly connected to the main rod 2 by the ruler-gauge connection screw 12.

[0033] The upper end of the compass main arm 4 is provided with a fixed anti-slip knob 42, which is used to drive the compass main arm 4 to rotate and adjust the position of the compass main arm 4. A limit disk is fitted on the compass main arm 4 below the anti-slip knob 42 to prevent the compass main arm 4 from falling off the rotating bracket 3. The lower end of the compass main arm 4 has a conical structure, which is a 60° cone in this embodiment, to assist in the positioning of the center.

[0034] In this embodiment, the compass main arm 4 is integrally formed from 304 stainless steel. The top anti-slip knob 42 has a 15mm diameter cap and a 0.2mm deep knurled surface. A fluororubber O-ring is installed in the pencil clamping slot 75, with a damping torque of 0.2-0.5 N·m, and works in conjunction with the boom fastening screw 74 to clamp the drawing pen. The loading and unloading time is ≤2 seconds. The anti-slip knob 42 is ergonomically designed, and the anti-slip design of the cap facilitates the rotation of the entire compass.

[0035] The compass main arm 4 is integrally formed from 304 stainless steel and adopts a three-section integrated structure to achieve the functions of center positioning and rotation drive: the bottom is a cone tip with a cone angle of 60°, which is used to penetrate the paper to achieve precise center positioning; the middle cylinder serves as the main support body, and a limit component is also provided at the contact point with the radius adjustment slide rail 6; the small cylinder at the top of the compass main arm 4 has a threaded hole, which is rigidly connected to the knurled cap (diameter 15mm, knurling depth 0.2mm) of the anti-slip knob 42 through the thread; the anti-slip texture on the surface of the anti-slip knob 42 improves the efficiency of torque transmission.

[0036] The rotating connecting shaft is set parallel to the drawing. The rotating connecting shaft has a guide opening along its length. A limiting component 8 is slidably mounted on the rotating connecting shaft along the length of the side connecting the rotating bracket 3 and the compass main arm 4. The limiting component 8 has a U-shaped structure with a downward opening. The two side walls of the U-shape are bent inward to form an extension to lock the side connecting the rotating bracket 3 and the compass main arm 4 to prevent the limiting component 8 from falling off. The internal space of the U-shape serves as a bracket slot 82. The limiting component 8 is mounted on the side connecting the rotating bracket 3 and the compass main arm 4 through the bracket slot 82. The upper end face of the limiting component 8 has a through hole that serves as a main arm slot. The compass main arm 4 passes through the main arm slot from top to bottom and is slidably mounted on the rotating bracket 3 through the guide opening. The limiting disc on the compass main arm 4 is in contact with the main arm slot. The limiting component 8 is used to keep the compass main arm 4 vertical.

[0037] The limiting component 8 and the guide opening on the rotating bracket 3 form a sliding pair constraint, which in turn forms a rotational pair constraint with the compass main arm 4. This ensures that when the limiting component 8 is not moving, the compass main arm can only rotate within the main arm slot 82, and the center of the circle does not shift. Both the main arm slot of the limiting component 8 and the wall of the bracket slot 82 are fitted with anti-slip damping strips to ensure an interference fit after the compass main arm is engaged, further preventing slippage. This allows the compass main arm 4 to slide stably along the length of the connecting side between the rotating bracket 3 and the compass main arm 4 after it passes through the guide opening.

[0038] When installing the limit component 8, simply align the bracket slot 82 with the tail of the slide groove at the upper end of the rotating bracket and slide it in parallel. During assembly, align the compass main arm 4 with the main arm slot and snap it in downwards.

[0039] The direction of the guide opening is consistent with the length direction of the side parallel to the drawing in the L-shaped rotating bracket 3.

[0040] One end of the radius adjustment slide rail 6 is an openable clamp structure. The openable clamp structure has a slot along the length of the radius adjustment slide rail 6. The compass main arm 4 passes through the slot. The inner diameter of the slot is slightly smaller than the outer diameter of the compass main arm 4. The slide rail fastening port 62 is set on both sides of the slot. After the screw passes horizontally through the slide rail fastening port 62, it forms a threaded engagement with the nut. This allows the radius adjustment slide rail 6 to be clamped and locked on the compass main arm 4 by tightening the screw through the slide rail fastening port 62, thus limiting the sliding of the radius adjustment slide rail 6 along the length of the compass main arm 4. The radius adjustment slide rail 6 has an inner slide rail and a scale on one side wall.

[0041] The left side of the radius adjustment slide rail 6 has an openable clamp structure, which is locked to the main arm 4 by passing an M3 fastening screw through the slide rail fastening port 62. The right side slide groove surface is provided with a 5-85mm precision scale line, and a silicone damping strip (Shore hardness 50A) is attached inside the slide groove.

[0042] Specifically, the radius adjustment slide rail 6 is a hollow strip structure. The radius adjustment slide rail 6 has a first opening that runs through the top and bottom along the length of the radius adjustment slide rail 6, which is parallel to the direction of the drawing paper. This opening is used to allow the boom 7 to pass through and adjust the position of the drawing pen. The two side walls of the radius adjustment slide rail 6 are provided with a second opening along the length of the radius adjustment slide rail 6, which is parallel to the direction of the drawing paper. The side wall of the radius adjustment slide rail 6 is also provided with a scale.

[0043] like Figure 3 As shown, the boom 7 includes an L-shaped fastening slider 73, a scale indicator 71, and a pencil holder groove 75 arranged sequentially from top to bottom. One side of the L-shape of the L-shaped fastening slider 73 is parallel to the drawing, and the other side of the L-shape of the L-shaped fastening slider 73 is provided with a slider fastening screw 72. One end of the slider fastening screw 72 passes through the L-shaped fastening slider 73 and is used to connect to the outer wall of the radius adjustment slide rail 6. The slider fastening screw 72 is in contact with the outer wall of the radius adjustment slide rail 6, so that the boom 7 is fixed to the radius adjustment slide rail 6 by screwing in the slider fastening screw 72 to press the outer wall of the radius adjustment slide rail 6.

[0044] The middle part of the scale indicator 71 is fitted into the inner slide of the radius adjustment slide rail 6. Both horizontal ends of the scale indicator 71 extend out of the inner slide rail and are connected to a triangular pyramid structure at the end of the radius adjustment slide rail 6 with the scale sidewall. The upper end of the scale indicator 71 extends out of the inner slide rail and is fixedly connected to the lower end face of the L-shaped fastening slider 73. The lower end of the scale indicator 71 extends out of the inner slide rail and is fixedly connected to the pencil clamping groove 75.

[0045] Specifically, the lower end face of the side parallel to the drawing in the L-shaped fastening slider 73 is fixedly connected to the scale indicator 71. The scale indicator 71 is cross-shaped. The horizontal part of the cross of the scale indicator 71 is embedded in the second opening on both sides of the radius adjustment slide rail 6. A triangular pyramid structure is provided at the end of the horizontal part facing the scale side wall of the radius adjustment slide rail 6 to accurately indicate the corresponding scale value. The vertical part of the cross of the scale indicator 71 passes vertically through the first opening that runs through the radius adjustment slide rail 6. The upper end of the vertical part of the scale indicator 71 is fixedly connected to the L-shaped fastening slider 73, and the lower end is fixedly connected to the pencil clamping groove 75.

[0046] The pencil holding slot 75 is a hollow cylindrical structure for inserting drawing pens, and a fastening screw 74 is provided on its side. The fastening screw 74 presses the drawing pen inserted into the slot, achieving clamping and fixing between the pencil and the pencil holding slot 75. In this embodiment, the triangular pyramid has a cone angle of 30°, and the alignment error between the tip and the slide rail scale line is ±0.1mm. The compass arm 7 constrains the planar displacement through the first and second openings, and the slider fastening screw 72 presses against the side wall of the radius adjustment slide rail 6 to form a friction lock. That is, when the L-shaped fastening slider 73 moves along the slide rail, the ±0.1mm scale alignment is achieved through silicone corrugated damping, and tightening the screw 72 completes the mechanical locking.

[0047] In other words, when the slider fastening screw 72 is tightened, the boom 7 will move backward until the triangular pyramid structure at the front end of the scale indicator 71 blocks the second opening, thus fixing the boom 7.

[0048] Polyurethane anti-slip strips are provided on the side walls of the first and second openings in the radius adjustment slide rail 6; the surface of the silicone damping strip of the radius adjustment slide rail 6 is molded with a sinusoidal wave pattern with a wavelength of 2mm and a wave height of 0.1mm, and is fixed to the slide groove with adhesive backing; the clearance fit tolerance between the first and second openings and the scale indicator 71 is H7 / h6.

[0049] The boom 7 is installed on the radius adjustment slide rail 6 in a segmented assembly manner. First, the radius adjustment slide rail 6 is divided into two parts along its own length direction. The cross part of the scale indicator 71 is inserted into the inner slide rail and then the triangular pyramid structure is assembled. Then, the two parts, L-shaped fastening slider 73 and pencil clamping groove 75, are connected.

[0050] The compass section innovatively employs a double parallel arm anti-deviation structure and a radius adjustment slide rail 6 (Shore hardness 50A), combined with a triangular pyramid-scale alignment device to achieve a drawing accuracy of ±0.5mm. This is particularly suitable for engineering drawing teaching scenarios. The double parallel arm structure consists of parallel connecting rods between the main arm 4 and the movable arm 7, with a parallelism ≤0.05mm, suppressing radial deviation; the silicone damping of the radius adjustment slide rail 6 works in conjunction with the movable arm 7 to achieve rigidity maintenance during radius adjustment.

[0051] The rotating bracket 3 is fitted onto the main rod 2 via a fluororubber O-ring. The O-ring is positioned between the inner wall of the hole in the rotating bracket 3 and the main rod 2 to provide moderate damping force, ensuring smooth rotation of the rotating bracket 3 around the main rod 2 while preventing wobbling or positional shift during rotation. The damped rotating bracket 3 with the fluororubber O-ring provides 0.2-0.5 N·m of rotational damping, enabling 360° angle adjustment, and, in conjunction with the guide opening on the rotating bracket 3, achieving rapid center positioning. The bracket 3 forms a rotationally damped connection with the outer wall of the main rod 2 via the fluororubber O-ring, with an angle switching time of ≤3 seconds.

[0052] The following is an example of how to use the plotter: 1) such as Figure 4 As shown, during operation, first insert the silicone suction cup into the suction cup slot 13, then place the side of the main ruler 1 against the baseline of the drawing, press the silicone suction cup in the suction cup slot 13 to make it adhere to the table, thus quickly and stably fixing the main ruler 1 to the baseline (basic line quick fixing function); then, insert the auxiliary ruler vertically along the right-angled rectangular groove of the stabilizing groove 14. The knurled pattern in the groove and the silicone damping strip provide frictional resistance, ensuring that the auxiliary ruler and the main ruler 1 form an orthogonal structure (vertical deviation ≤ ±0.5°) (vertical calibration function); after sliding the auxiliary ruler to align the longitudinal scale of the main ruler 1 with the target Y coordinate, the transverse scale of the auxiliary ruler directly displays the X coordinate value (dual-dimensional positioning function).

[0053] 2) such as Figure 5 As shown, during operation, the target center is quickly located using the dual-dimensional positioning function of the vertical calibration module. Then, the rotating support 3 is moved to the target direction, and the compass main arm 4 is slid to complete the center positioning before drawing. When storing, the main rod 2 is rotated out to detach from the drawing plane. The function switching time is ≤3 seconds. This module achieves rapid adaptation of the compass and main scale and multi-angle drawing switching through a damped rotation and slide rail limiting composite mechanism.

[0054] 3) such as Figure 5 As shown, during operation, first press the 60° conical tip at the bottom of the compass main arm 4 vertically against the paper to complete the center positioning. Tighten the M3 screw of the slide rail fastening port 62 to lock the connection between the radius adjustment slide rail 6 and the main arm 4. Push the L-shaped fastening slider 73 of the boom module 7 to move along the slide rail 6. The sinusoidal wave pattern (wavelength 2mm) of the silicone damping strip provides uniform sliding resistance, so that the triangular pyramid tip of the scale indicator 71 is accurately aligned with the target scale of 5-85mm (error ±0.1mm). Then tighten the slider fastening screw 72 to achieve mechanical locking. Insert the drawing pen into the pencil holder groove 75 at the bottom of the boom 7. The rotational damping of the fluororubber O-ring (0.2-0.5N·m) and the boom fastening screw 74 complete the double fixation of the pen body. Finally, press down the main arm 4 to keep the center stable. Rotate the anti-slip knob 5 to drive the double parallel arm structure (parallelism ≤0.05mm) to rotate at a constant speed, suppressing radial offset while achieving high-precision arc drawing of ±0.5mm.

[0055] This invention innovatively integrates the vertical calibration main scale 1, compass, and radius adjustment slide rail 6. Through the rapid fixation of the main scale 1's adsorption-type reference line and the damping orthogonal calibration mechanism of the stabilizing slide groove 14, a single insertion of the scale completes the vertical line drawing and two-dimensional positioning. Combined with the 360° fluororubber damping rotation system of the rotating bracket 3, the compass main arm 4 achieves seamless switching of multiple angles. Relying on the silicone wave-pattern elastic damping of the radius adjustment slide rail 6 and the precise alignment of the triangular pyramid tip of the boom 7, a two-level control of "anti-slip adjustment - engraving lock" is formed. Finally, the radial offset is suppressed by the double parallel arm anti-deviation structure (parallelism ≤ 0.05 mm) and the composite friction locking device, thus constructing a technical closed loop of "reference adsorption fixation - damping adjustment - rigid trajectory maintenance". This overcomes the three major pain points of traditional drawing tools: low vertical calibration efficiency, frequent center slippage, and radius adjustment inaccuracy.

[0056] This compass achieves high-precision drawing of ±0.5mm through a double parallel arm anti-deviation structure, a silicone damping slide rail system, and a triangular pyramid-scale precision alignment device. This improves stability by over 40% compared to traditional compasses and combines anti-slip adjustment with rigidity retention. During operation, after positioning the center, tighten the anti-slip knob, push the boom along the slide rail to the target radius, and then precisely align the triangular pyramid tip with the scale line before tightening the fixing screw. The double parallel arm structure (parallelism ≤0.05mm) effectively suppresses radial deviation when rotating the main arm.

[0057] The main innovation of this utility model is: 1. This utility model uses a vertically calibrated main ruler 1 to align with the baseline, functioning as a ruler. When used with an auxiliary ruler, it eliminates the need for repeated alignment with the baseline, reducing drawing errors. This design allows beginners to complete vertical line drawing and coordinate positioning with a single ruler insertion, without manually adjusting the angle, balancing efficiency and accuracy.

[0058] 2. By combining the compass with the vertical calibration main ruler and auxiliary ruler, the center of the circle can be directly located on the drawing paper when adjusting the center position of the compass. There is no need to repeatedly switch tools, which can achieve efficient and convenient coordinate positioning, and quickly find the required drawing points and measure the drawing length.

[0059] 3. By connecting the compass to the rotating bracket 3, the compass can be kept perpendicular to the paper. Combined with the parallel arm design of the main arm and the moving arm of the compass, there is no need to tilt the compass to draw arcs. This solves the technical problems of inaccurate positioning of extremely small radius and center offset when drawing large radius circles due to the sliding of the support feet of traditional compasses. At the same time, the radius adjustment slide rail 6 can realize the visual adjustment of the radius.

[0060] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A reference vertical calibration and slide rail circle-fixing auxiliary plotter, used for positioning and drawing arcs on a drawing, characterized in that: The system includes a vertical calibration main scale (1), a main rod (2), a rotating bracket (3), a compass main arm (4), a radius adjustment slide rail (6), and a movable arm (7). The vertical calibration main scale (1) has graduations and is placed horizontally on the drawing. The main rod (2) is vertically fixed to the vertical calibration main scale (1). The rotating bracket (3) has an L-shaped structure, with one side of the L-shape fitted onto the main rod (2) and the other side serving as a rotating connecting shaft connected to the compass main arm (4) for adjusting the rotation angle of the compass main arm (4) around the main rod (2). The main arm (4) is set perpendicular to the drawing. The main arm (4) of the compass is slidably mounted on the rotating bracket (3) along the length direction of the rotating connecting shaft. It is used to determine the center of the drawn arc. The radius adjustment slide rail (6) is slidably mounted on the main arm (4) of the compass along the length direction of the main arm (4). The radius adjustment slide rail (6) is provided with a scale. The movable arm (7) is slidably mounted on the radius adjustment slide rail (6) along the length direction of the radius adjustment slide rail (6). It is used to hold the drawing pen to draw the arc and adjust the radius of the drawn arc. The upper end of the compass main arm (4) is provided with an anti-slip knob (42), and a limit disc is fixedly mounted on the compass main arm (4) below the anti-slip knob (42) to prevent the compass main arm (4) from coming off the rotating bracket (3). The lower end of the compass main arm (4) has a tapered structure. A limiting component (8) is slidably mounted on the rotating connecting shaft along the length direction of the rotating connecting shaft. The limiting component (8) has a through hole as a main arm slot. The rotating connecting shaft is set parallel to the drawing and has a guide opening along the length direction of the rotating connecting shaft. The compass main arm (4) passes through the main arm slot from top to bottom and is slidably mounted on the rotating bracket (3) through the guide opening. The limiting disc on the compass main arm (4) is in contact with the main arm slot. The limiting component (8) is used to keep the compass main arm (4) vertical. The rotating support (3) is mounted on the main rod (2) by a fluororubber O-ring.

2. The reference vertical calibration and slide rail circle-fixing auxiliary plotter according to claim 1, characterized in that: It also includes an auxiliary ruler. The vertical calibration main ruler (1) has an L-shaped structure. An L-shaped groove (14) is provided on the inner side of the L-shaped corner of the lower end face of the vertical calibration main ruler (1). The auxiliary ruler is slidably embedded in the L-shaped groove (14).

3. The reference vertical calibration and slide rail circle-fixing auxiliary plotter according to claim 2, characterized in that: The lower end face of the vertical calibration main scale (1) is provided with a suction cup groove (13) and a silicone suction cup is installed in the suction cup groove (13) for adsorbing and fixing the vertical calibration main scale (1). The vertical calibration main ruler (1) has a threaded hole at the L-shaped corner as a ruler-gauge connection screw (12), and is threadedly fixed to the main rod (2) through the ruler-gauge connection screw (12).

4. The reference vertical calibration and slide rail circle-fixing auxiliary plotter according to claim 1, characterized in that: One end of the radius adjustment slide rail (6) is an openable clamp structure. The openable clamp structure has a slot along the length of the radius adjustment slide rail (6). The main arm of the compass (4) passes through the slot. The slide rail fastening port (62) is set on both sides of the slot. The screw passes horizontally through the slide rail fastening port (62) and forms a threaded engagement with the nut. The radius adjustment slide rail (6) has an inner slide rail and a scale on one side wall.

5. The reference vertical calibration and slide rail circle-fixing auxiliary plotter according to claim 4, characterized in that: The boom (7) includes an L-shaped fastening slider (73), a scale indicator (71), and a pencil holder slot (75) arranged sequentially from top to bottom. One side of the L-shaped fastening slider (73) is parallel to the drawing, and the other side of the L-shaped fastening slider (73) is fitted with a slider fastening screw (72). One end of the slider fastening screw (72) passes through the L-shaped fastening slider (73) and is used to connect to the outer wall of the radius adjustment slide rail (6). The middle part of the scale indicator (71) is embedded in the inner slide of the radius adjustment slide rail (6). Both ends of the horizontal slide rail extend into the inner slide rail and point to the end of the radius adjustment slide rail (6) with a scale sidewall connected to a triangular pyramid structure. The upper end of the scale indicator (71) extends into the inner slide rail and is fixedly connected to the lower end face of the L-shaped fastening slider (73). The lower end of the scale indicator (71) extends into the inner slide rail and is fixedly connected to the pencil clamping groove (75). The pencil clamping groove (75) is a hollow cylindrical structure for inserting drawing pens and has a moving arm fastening screw (74) on its side. The moving arm fastening screw (74) passes into the pencil clamping groove (75) and is used to connect to the outer circumference of the drawing pen.

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