An angle measuring device for engineering cost

Abstract

This invention discloses an angle measuring device for engineering cost estimation, relating to the field of laser measurement technology. It includes a base, a rotating disk and a rotating rod rotatably connected to the top of the base, a connecting rod slidably connected to the upper part of the rotating disk, a laser head fixedly connected to the rotating disk, a support frame fixedly connected to the top of the base, a worktable fixedly connected to the bottom of the support frame, a lifting rod and a placement platform movably connected to the worktable, a straightening plate fixedly sleeved on the outer surface of the lifting rod, and a measuring component mounted on the base. Through the cooperation of the above structures, this invention achieves sequential linkage of intermittent rotation of the rotating disk, movement of the laser measuring component, automatic straightening of the bent part, and lifting of the placement platform using a single drive source. This ensures automated continuous operation of the entire process of the bent part, from initial placement, automatic straightening and angle positioning, measurement station switching, to final measurement completion.

Description

Technical Field

[0001] This invention relates to the field of laser measurement technology, specifically to an angle measuring device for engineering cost estimation. Background Technology

[0002] In engineering cost estimation activities (especially in the quantity calculation stage), non-contact methods are used to quickly obtain geometric data such as specific angles, slopes, and inclinations of buildings, components, or engineering sites, providing an accurate data foundation for cost accounting.

[0003] For example, Chinese utility model patent application number 202510637548.5 discloses a laser measuring device for bending angle of bent parts. When performing laser measurement on bent parts, this invention uses a spiral groove and a fixing bead to rotate the handle and move the adjusting plate. The connecting rod and the diffusion groove cause four fixing bars to protrude from the telescopic groove and fix the tube from the inside, ensuring continuous laser scanning and accuracy. After measuring one side, the telescopic rod and the support rod, the toothed rod and the limiting plate cooperate to lift, rotate and flip the tube to change the surface. A single clamping completes the data acquisition of both sides, improving efficiency and data reliability.

[0004] However, existing bending angle measuring devices still have the following problems in actual implementation:

[0005] Currently, when measuring bent parts, existing devices require operators to manually place the bent part on the clamping assembly during the measurement preparation stage. The operator must then visually determine whether the surface to be measured is strictly perpendicular to the laser beam before clamping can be performed. This process is highly dependent on the operator's subjective experience and skill level, and is easily affected by visual judgment errors, inaccurate manual positioning, or uneven clamping force, directly impacting the accuracy of the measurement reference. Secondly, when measuring both sides of the bent part, most existing devices use a switching method where the clamping end acts as a rotation fulcrum, causing the bent part to rotate 180° as a whole. During this rotation, because the clamping point bears a large concentrated torsional stress, the bent part is prone to slight relative slippage or angular displacement within the fixture, causing the actual rotation angle to deviate from the preset 180° position. This results in secondary errors in subsequent measurements, further reducing the accuracy of the measurement results and the stability of the device. Summary of the Invention

[0006] The purpose of this invention is to provide an angle measuring device for engineering cost estimation, which solves the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an angle measuring device for engineering cost estimation, comprising a base, a rotating disk and a rotating rod rotatably connected to the top of the base, a connecting rod slidably connected to the upper part of the rotating disk, a laser head fixedly connected to the rotating disk, a support frame fixedly connected to the top of the base, a worktable fixedly connected to the bottom of the support frame, a lifting rod and a placement platform movably connected to the worktable, a straightening plate fixedly sleeved on the outer surface of the lifting rod, and a measuring component provided on the base;

[0008] The measuring component includes:

[0009] The periodic clutch component uses the rotation of the rotating rod to drive the rotating disk to rotate intermittently. This intermittent rotation of the rotating disk causes the laser head to rotate synchronously and measure both sides of the bent part.

[0010] The ordered state conversion component is connected to the periodic clutch component for transmission. When the rotating disk rotates, it drives the lifting rod to move the straightening plate upward to calibrate the bent part before measurement.

[0011] The optical path protection component is connected to the periodic clutch component. When the rotating disk rotates, the drive linkage pulls the placement platform to move downwards to avoid obstruction during measurement.

[0012] Optionally, the periodic clutch component includes a drive motor, four rotating slots, a stationary slot, a slider, and a fixed shaft. The drive motor is fixedly installed at the bottom of the base. The four rotating slots and the stationary slot are all opened at the bottom of the rotating disk. The fixed shaft is fixedly installed at the top of the rotating disk. A gear is fixedly sleeved on the outer surface of the fixed shaft. The slider is fixedly installed at the top of the rotating block.

[0013] Optionally, the rotating rod is fixedly connected to the output end of the drive motor, the slider is adapted to the rotating groove, and all four rotating grooves are connected to the stationary groove.

[0014] Optionally, the ordered state conversion component includes a rotating cylinder, a second slider, two limiting grooves, and a mounting block. The rotating cylinder is rotatably mounted on the bottom of the worktable. The rotating cylinder has a lifting groove and a settling groove. A second gear is fixedly fitted on the outer surface of the rotating cylinder. The first gear meshes with the second gear. The second slider is fixedly mounted on the lifting rod. The second slider is slidably connected to the lifting groove and the settling groove. The mounting block is fixedly fitted on the outer surface of the lifting rod. The front of the mounting block is fixedly connected to the back of the straightening plate. The straightening plate is provided with two sets of auxiliary components. The two limiting grooves are opened on the back of the straightening plate.

[0015] Optionally, the auxiliary component includes two threaded rods threadedly connected to one side of the straightening plate, one end of the two threaded rods is fixedly connected to a U-shaped plate, a rotating shaft is fixedly connected between the U-shaped plates, two auxiliary wheels are rotatably connected to the outer surface of the rotating shaft, and a limiting rod is fixedly connected to the back of the U-shaped plate, the limiting rod moving through the limiting groove.

[0016] Optionally, the optical path protection component includes a descending groove, a stabilizing groove, an ascending groove, a slider three, and a sleeve. The sleeve is fixedly installed at the bottom of the lifting platform, the slider three is fixedly installed at the bottom of the connecting rod, and the descending groove, the stabilizing groove, and the ascending groove are all opened at the top of the rotating disk.

[0017] Optionally, the sleeve is movably connected to the fixed shaft, the slider is slidably connected to the descending groove, the stabilizing groove, and the ascending groove, and the other end of the connecting rod is fixedly connected to the sleeve.

[0018] Optionally, a recording and detection assembly is fixedly installed on the top of the support frame, a receiver is fixedly connected to the top of the rotary disk, and a retaining ring is fixedly connected to the top of the base.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] I. This invention utilizes the continuous rotational motion of a single drive source, which, via a rotating rod, drives a slider in conjunction with the rotating groove and the stationary groove. This enables the intermittent indexing rotation of the rotating disk, the movement of the laser and receiver, the lifting and lowering of the ordered state conversion component, and the sequential linkage of the lifting and lowering of the placement platform. This allows the entire process of the bent part, from initial placement, automatic straightening and angle positioning, measurement station switching, to final reset and removal, to be completed automatically without manual intervention. This not only significantly reduces the labor intensity of operators but also avoids errors that may arise from rotating the bent part when measuring both sides, thereby improving measurement accuracy.

[0021] Second, this invention uses the continuous rotation of a rotating disk to drive a straightening plate to rise smoothly along a preset trajectory, automatically and precisely lifting a horizontally placed bent part to a 90° vertical position. This mechanical action ensures that the measured surface of the bent part remains strictly perpendicular to the emission direction of the laser beam, thus establishing a stable geometric reference in optical measurement. Moreover, this process is entirely mechanical, eliminating variables caused by human intervention. This ensures that each measurement is performed under completely consistent and repeatable mechanical conditions. Therefore, it fundamentally eliminates random measurement errors introduced by operator visual judgment deviations, manual straightening angle errors, or inconsistent clamping force, significantly improving the accuracy and repeatability of the measurement system.

[0022] Third, when the placement platform is in the raised state, the present invention provides a stable and horizontal initial support platform for the worker to place the bent part, ensuring that the bent part can be accurately positioned. When the rotary table starts to rotate and enters the measurement, the placement platform moves synchronously with the rotary table through the movement of slider three. During the process of the bent part being lifted by the straightening plate and rotating with the rotary table to the measurement station, the placement platform has completely descended to the avoidance position, ensuring that the placement platform does not obstruct the laser beam path at the moment of final laser measurement. When the rotary table starts to rotate, the placement platform remains stationary during the initial rising stage of the straightening plate, avoiding the bending part from shaking when it begins to be stressed. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is an exploded view of the overall structure of the present invention from the left view.

[0025] Figure 3 This is a schematic diagram of the rotating disk and worktable, etc., in the left-side view of the present invention.

[0026] Figure 4 This is a schematic diagram of the transmission between the rotating rod and the rotating disk in the upward view of the present invention;

[0027] Figure 5 This is a schematic diagram of the lifting platform and straightening plate, etc., in the left-view state of the present invention;

[0028] Figure 6 This is a schematic diagram of the transmission between the rotating cylinder and the lifting rod in the rear view of the present invention;

[0029] Figure 7 This is a schematic diagram of the transmission between the fixed shaft and the rotating cylinder in the right view of the present invention;

[0030] Figure 8 This is a top view of the connecting rod and sleeve structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the transmission between the connecting rod and the placement platform in the left-side view of the present invention.

[0032] In the diagram: 1. Base; 2. Rotary disk; 3. Rotating rod; 4. Connecting rod; 5. Laser head; 6. Support frame; 7. Worktable; 8. Lifting rod; 9. Placement platform; 10. Straightening plate; 11. Drive motor; 12. Rotating groove; 13. Static groove; 14. Fixed shaft; 15. Gear 1; 16. Slider 1; 17. Rotating cylinder; 18. Slider 2; 19. Limiting groove; 20. Mounting block; 21. Lifting groove; 22. Leveling groove; 23. Gear 2; 24. Threaded rod; 25. U-shaped plate; 26. Rotating shaft; 27. Auxiliary wheel; 28. Limiting rod; 29. ​​Lowering groove; 30. Stabilizing groove; 31. Rising groove; 32. Slider 3; 33. Sleeve; 34. Recording and detection assembly; 35. Receiver; 36. Enclosure ring. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1, please refer to Figures 1 to 4 The present invention provides an angle measuring device for engineering cost estimation, including a base 1, a rotating disk 2 and a rotating rod 3 rotatably connected to the top of the base 1, a connecting rod 4 slidably connected to the upper part of the rotating disk 2, a laser head 5 fixedly connected to the rotating disk 2, a support frame 6 fixedly connected to the top of the base 1, a worktable 7 fixedly connected to the bottom of the support frame 6, a lifting rod 8 and a placement platform 9 movably connected to the worktable 7, a straightening plate 10 fixedly sleeved on the outer surface of the lifting rod 8, and a measuring component provided on the base 1;

[0035] The measurement components include a periodic clutch component, an ordered state conversion component, and an optical path protection component.

[0036] The periodic clutch component includes a drive motor 11, four rotating slots 12, a stationary slot 13, a slider 16, and a fixed shaft 14. The drive motor 11 is fixedly installed at the bottom of the base 1. The four rotating slots 12 and the stationary slot 13 are all located at the bottom of the rotating disk 2. The fixed shaft 14 is fixedly installed at the top of the rotating disk 2. A gear 15 is fixedly fitted on the outer surface of the fixed shaft 14. The slider 16 is fixedly installed at the top of the rotating block. The rotating rod 3 is fixedly connected to the output end of the drive motor 11. The slider 16 is adapted to the rotating slots 12. All four rotating slots 12 are connected to the stationary slots 13. A recording and detection component 34 is fixedly installed at the top of the support frame 6. A receiver 35 is fixedly connected to the top of the rotating disk 2. A retaining ring 36 is fixedly connected to the top of the base 1.

[0037] More specifically, in this embodiment: by starting the drive motor 11, its output end drives the rotating rod 3 to rotate, and the slider 16 on the rotating rod 3 moves in a circular motion. When the slider 16 enters the rotating groove 12 and moves towards the stationary groove 13, it abuts against the rotating disk 2, thereby driving the rotating disk 2 to rotate. After the slider 16 leaves the rotating groove 12 and enters the stationary groove 13, it loses contact with the rotating disk 2. At this time, the rotating disk 2 has just completed a 90° rotation and stops. The rotating disk 2 brings the laser head 5 and the receiver 35 to the measurement station. When the slider 16 rotates from the stationary groove 13 to another rotating groove 12, the rotating disk 2 is in a stationary state, thereby using this interval to measure the calibrated bent part.

[0038] Specifically, during measurement, the receiver 35, laser head 5, and recording and detection component 34 are activated. The laser beam emitted by the laser head 5 scans one side of the bending surface of the bent component. The receiver 35 and the laser head 5 work together based on the principle of triangulation to capture the precise two-dimensional coordinates of the laser spot on the receiver 35 in real time, thereby obtaining the spatial position point cloud data of each contact point on the bending surface. This coordinate data is transmitted to the recording and detection component 34. The system calculates the spatial plane equations of the two bending surfaces through a geometric fitting algorithm, and then solves the angle between the two planes, that is, the bending angle of the bent component. The measurement results are displayed on the screen of the recording and detection component 34 in real time.

[0039] It is worth noting that when the slider 16 rotates in contact with the rotating disk 2, the laser and receiver 35 can move in multiple positions. Without moving the bent part, the measurement and collection of data on both sides of the bent part can be completed. At the same time, the data processing is completed during the intermittent process of the rotating disk 2 driving the laser and receiver 35 to rotate after the first measurement.

[0040] Example 2, based on the above examples:

[0041] Please see Figures 1 to 7The components include: an ordered state conversion component comprising a rotating cylinder 17, a second slider 18, two limiting grooves 19, and a mounting block 20. The rotating cylinder 17 is rotatably mounted on the bottom of the workbench 7. The rotating cylinder 17 has a lifting groove 21 and a leveling groove 22. A second gear 23 is fixedly fitted onto the outer surface of the rotating cylinder 17. A first gear 15 meshes with the second gear 23, and the ratio of the first gear 15 to the second gear 23 is 1:1. The second slider 18 is fixedly mounted on the lifting rod 8. The second slider 18 is slidably connected to the lifting groove 21 and the leveling groove 22. The mounting block 20 is fixedly fitted onto the lifting rod. The outer surface of the rod 8, the front of the mounting block 20 is fixedly connected to the back of the straightening plate 10, the straightening plate 10 is provided with two sets of auxiliary components, two limiting grooves 19 are opened on the back of the straightening plate 10, the auxiliary components include two threaded rods 24 threadedly connected to one side of the straightening plate 10, one end of the two threaded rods 24 is fixedly connected to a U-shaped plate 25, a rotating shaft 26 is fixedly connected between the U-shaped plates 25, two auxiliary wheels 27 are rotatably connected to the outer surface of the rotating shaft 26, and a limiting rod 28 is fixedly connected to the back of the U-shaped plate 25, the limiting rod 28 movably passes through the limiting groove 19.

[0042] More specifically, in this embodiment: during the rotation of the rotating disk 2, the fixed shaft 14 and the gear 15 rotate synchronously. The gear 15 drives the gear 23 and the rotating cylinder 17 to rotate, causing the slider 28 to rise along the lifting groove 21. The slider 28 drives the lifting rod 8 and the straightening plate 10 to rise. The auxiliary wheel 27 then lifts one end of the bent part on the platform 9. As the straightening plate 10 continues to rise, the bent part is gradually bent to close to 90°. When the rotating disk 2 is in position, the slider 28 enters the leveling groove 22. The bent part is stably lifted to 90° and clamped between the two auxiliary wheels 27 to hold and fix it, ensuring that its surface to be tested is perpendicular to the laser beam of the laser head 5 that has been positioned.

[0043] It is worth noting that when the rotary disk 2 rotates to 90°, the second slider 18 drives the lifting plate to rise under the restriction of the lifting groove 21. When the rotary disk 2 rotates to 180° and 270°, the second slider 18 enters the stabilizing groove. Under the restriction of the stabilizing groove, the second slider 18 ensures that the straightening plate 10 is maintained at the calibrated height. When the rotary disk 2 rotates to 360°, the second slider 18 moves along the lifting groove 21, causing the auxiliary component to release the fixation of the bent part after measurement.

[0044] Example 3, based on the above examples:

[0045] Please see Figures 1 to 9The components include: the optical path protection components include a descending groove 29, a stabilizing groove 30, an ascending groove 31, a slider 32, and a sleeve 33. The sleeve 33 is fixedly installed at the bottom of the lifting platform, and the slider 32 is fixedly installed at the bottom of the connecting rod 4. The descending groove 29, the stabilizing groove 30, and the ascending groove 31 are all opened at the top of the rotating disk 2. The sleeve 33 is movably connected to the fixed shaft 14. The slider 32 is slidably connected to the descending groove 29, the stabilizing groove 30, and the ascending groove 31. The other end of the connecting rod 4 is fixedly connected to the sleeve 33.

[0046] More specifically, in this embodiment: when the rotary disk 2 starts to rotate, the slider 32 moves from the first stabilizing groove 30 to the descending groove 29, so that the straightening plate 10 remains stationary on the placement platform 9 during the initial rising stage, preventing the bent part from shaking when it begins to be stressed. As it continues to rotate, the slider 32 enters the descending groove 29 and drives the placement platform 9 to move down through the connecting rod 4 and the sleeve 33. When the rotary disk 2 rotates to 90°, the highest point of the placement platform 9 is lower than the surface of the worktable 7, thereby ensuring that the laser beam is not blocked by the placement platform 9 during measurement.

[0047] It is worth noting that when the rotating disk 2 rotates 90°, at the beginning of its rotation, the slider 32 is first restricted by the stabilizing groove 30 at one end, and then the slider 32 moves into the descending groove 29, thereby driving the placement table 9 to move down. When the rotating disk 2 rotates to 180° and 270°, the slider 32 enters the stabilizing groove 30. Under the restriction of the stabilizing groove 30, the slider 32 ensures that the highest point of the placement table 9 is always below the worktable 7 during the measurement. At the same time, the length of the bent part is longer than the length of the placement table 9, and the bent part will not fall down as the placement table 9 descends.

[0048] Working principle: When using the angle measuring device for engineering cost estimation, there are four working states, corresponding to the rotating disk 2 rotating to 90°, 180°, 270° and 360° respectively. When it is necessary to measure the bent part, the operator first adjusts the spacing of the auxiliary wheels 27 according to the diameter of the bent part: by rotating the threaded rod 24, the U-shaped plate 25 drives the auxiliary wheels 27 to move closer together along the direction of the limiting groove 19, and then the bent part is placed on the placement table 9;

[0049] The device enters the first state, that is, the rotating disk 2 rotates to 90°: by starting the drive motor 11, its output end drives the rotating rod 3 to rotate, and the slider 16 on the rotating rod 3 makes a circular motion. When the slider 16 enters the rotating groove 12 and moves towards the stationary groove 13, it abuts against the rotating disk 2, thereby driving the rotating disk 2 to rotate. After the slider 16 leaves the rotating groove 12 and enters the stationary groove 13, it loses contact with the rotating disk 2. At this time, the rotating disk 2 has just completed a 90° rotation and stops. At the same time, the rotating disk 2 brings the laser head 5 and the receiver 35 to the measurement station.

[0050] During the rotation of the rotating disk 2 by 90°, the fixed shaft 14 and the gear 15 rotate synchronously. The gear 15 drives the gear 23 and the rotating cylinder 17 to rotate, causing the slider 28 to rise along the lifting groove 21. The slider 28 drives the lifting rod 8 and the straightening plate 10 to rise. The auxiliary wheel 27 then lifts one end of the bent part on the platform 9. As the straightening plate 10 continues to rise, the bent part is gradually bent to close to 90°. When the rotating disk 2 is in position, the slider 28 enters the leveling groove 22, and the bent part is stably lifted to 90°, ensuring that its test surface is perpendicular to the laser beam of the laser head 5 that has been positioned.

[0051] Meanwhile, after the rotary disk 2 starts to rotate, the slider 32 moves from the first stabilizing groove 30 to the lowering groove 29, so that the straightening plate 10 remains stationary on the placement table 9 during the initial rising stage, preventing the bent part from shaking when it starts to be stressed. As it continues to rotate, the slider 32 enters the lowering groove 29 and drives the placement table 9 to move down through the connecting rod 4 and the sleeve 33. When the rotary disk 2 rotates to 90°, the highest point of the placement table 9 is lower than the surface of the worktable 7, thus ensuring that the laser beam is not blocked by the placement table 9 during measurement.

[0052] The device enters the second state, where the rotating disk 2 rotates to 180°: slider 16 enters another rotating groove 12, and at this stage, it again comes into contact with the rotating disk 2, causing the rotating disk 2 to continue rotating to the 180° position. At this time, slider 2 18 moves in the leveling groove 22, keeping the lifting rod 8 and the straightening plate 10 at their raised height; slider 32 moves in the stabilizing groove 30, keeping the placement platform 9 in its lowered position.

[0053] The device enters the third state, that is, the rotating disk 2 rotates to 270°: during this process, the positions of the straightening plate 10 and the placement table 9 are consistent with the second state. When the rotating disk 2 rotates to 270°, the laser head 5 and the receiver 35 are taken to another measurement station to measure the other side of the bent part.

[0054] The device enters the fourth state, that is, the rotating disk 2 rotates to 360°: During this rotation stage, the second slider 18 disengages from the leveling groove 22 and enters the lifting groove 21. As the rotating disk 2 rotates, the second slider 18 moves down along the lifting groove 21, driving the lifting rod 8 and the straightening plate 10 to descend and reset. At the same time, the third slider 32 disengages from the stabilizing groove 30 and enters the rising groove 31, and presses the connecting rod 4 along the rising groove 31, pushing the placement platform 9 to rise back to the initial position.

[0055] The entire rotation process of the rotating disk 2 includes three intermittent pauses. These pauses occur because the slider 16 rotates from the stationary slot 13 to the other rotating slot 12, keeping the rotating disk 2 stationary. During these pauses, the laser head 5 can emit a beam of light, which, together with the receiver 35 and the detection system, measures the bent part, enabling the measurement of both sides of the bent part and the processing and uploading of data.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An angle measuring device for engineering cost estimation, comprising a base (1), characterized in that: The top of the base (1) is rotatably connected to a rotating disk (2) and a rotating rod (3). A connecting rod (4) is slidably connected to the upper part of the rotating disk (2). A laser head (5) is fixedly connected to the rotating disk (2). A support frame (6) is fixedly connected to the top of the base (1). A worktable (7) is fixedly connected to the bottom of the support frame (6). A lifting rod (8) and a placement platform (9) are movably connected to the worktable (7). A straightening plate (10) is fixedly sleeved on the outer surface of the lifting rod (8). A measuring component is provided on the base (1). The measuring component includes: The periodic clutch component rotates by rotating rod (3), which drives the rotating disk (2) to rotate intermittently, so that the laser head (5) rotates synchronously and measures both sides of the bent part; An ordered state conversion component is connected to a periodic clutch component for transmission, so that when the rotating disk (2) rotates, it drives the lifting rod (8) to move the straightening plate (10) upward to calibrate the bent part before measurement; The optical path protection component is connected to the periodic clutch component for transmission, so that when the rotating disk (2) rotates, the driving link (4) pulls the placement platform (9) down; The periodic clutch component includes a drive motor (11), four rotating slots (12), a stationary slot (13), a slider (16), and a fixed shaft (14). The drive motor (11) is fixedly installed at the bottom of the base (1). The four rotating slots (12) and the stationary slots (13) are all opened at the bottom of the rotating disk (2). The fixed shaft (14) is fixedly installed at the top of the rotating disk (2). A gear (15) is fixedly sleeved on the outer surface of the fixed shaft (14). The slider (16) is fixedly installed at the top of the rotating block. The rotating rod (3) is fixedly connected to the output end of the drive motor (11), the slider (16) is adapted to the rotating groove (12), and all four rotating grooves (12) are connected to the stationary groove (13). The ordered state conversion component includes a rotating cylinder (17), a second slider (18), two limiting grooves (19), and a mounting block (20). The rotating cylinder (17) is rotatably mounted on the bottom of the workbench (7). The rotating cylinder (17) has a lifting groove (21) and a leveling groove (22). The outer surface of the rotating cylinder (17) is fixedly fitted with a second gear (23). The first gear (15) meshes with the second gear (23). The second slider (18) is fixedly mounted on the lifting rod (8). The second slider (18) is slidably connected to the lifting groove (21) and the leveling groove (22). The mounting block (20) is fixedly fitted on the outer surface of the lifting rod (8). The front of the mounting block (20) is fixedly connected to the back of the straightening plate (10). The straightening plate (10) is provided with two sets of auxiliary components. The two limiting grooves (19) are opened on the back of the straightening plate (10). The optical path protection component includes a descending groove (29), a stabilizing groove (30), an ascending groove (31), a slider three (32), and a sleeve (33). The sleeve (33) is fixedly installed at the bottom of the lifting platform, and the slider three (32) is fixedly installed at the bottom of the connecting rod (4). The descending groove (29), the stabilizing groove (30), and the ascending groove (31) are all opened at the top of the rotating disk (2). The sleeve (33) is movably connected to the fixed shaft (14), the slider three (32) is slidably connected to the descending groove (29), the stabilizing groove (30) and the ascending groove (31), and the other end of the connecting rod (4) is fixedly connected to the sleeve (33).

2. The angle measuring device for engineering cost estimation according to claim 1, characterized in that: The auxiliary component includes two threaded rods (24) threadedly connected to one side of the straightening plate (10). One end of the two threaded rods (24) is fixedly connected to a U-shaped plate (25). A rotating shaft (26) is fixedly connected between the U-shaped plates (25). Two auxiliary wheels (27) are rotatably connected to the outer surface of the rotating shaft (26). A limiting rod (28) is fixedly connected to the back of the U-shaped plate (25). The limiting rod (28) moves through the limiting groove (19).

3. The angle measuring device for engineering cost estimation according to claim 1, characterized in that: A recording and detection assembly (34) is fixedly installed on the top of the support frame (6), a receiver (35) is fixedly connected to the top of the rotating disk (2), and a retaining ring (36) is fixedly connected to the top of the base (1).

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