Multifunctional detection ruler

Abstract

The invention provides a multifunctional detection ruler which comprises a protractor and a folding ruler, a center shaft is arranged at the circle center of the protractor, and a pointer is sleeved on the center shaft; two ends of the folding ruler are respectively provided with a shaft hole, the shaft hole at one end is sleeved on the central shaft, the shaft hole at the other end is provided with a tail plate, a fixing assembly is arranged below the protractor, suckers are fixed on the side face of a groove plate of the fixing assembly and the tail plate, and the folding ruler is fixed on the surface of an object to be measured through the suckers. The multifunctional detection ruler provided by the invention can realize organic combination of straight line and angle measurement, and has a quick fixing function, so that manual intervention is reduced, and the measurement precision and the working efficiency are improved. Meanwhile, the detection ruler also improves the portability and usability of the detection ruler, and provides a more convenient and efficient solution for professionals in the construction industry.

Description

Technical Field

[0001] The invention relates to the technical field of building construction detection rulers, and in particular to a multifunctional detection ruler. Background Art

[0002] In the construction industry, accurate measurement is one of the key factors to ensure the structural safety and functional rationality of buildings. Whether it is drawing drawings in the planning stage or confirming dimensions during the construction process, the measuring ruler plays an indispensable role as a basic tool. It not only affects the effective use of resources and the maximum design of space, but also directly affects the quality and efficiency of the final project. Therefore, a measuring ruler with excellent performance and diverse functions is crucial to improving the productivity of the construction industry.

[0003] At present, the foldable drawing rulers on the market are mainly composed of a combination of multiple scales, which are connected by rotation through the cooperation of the protrusion at one end and the groove at the other end, thereby supporting their folding function. This design is easy to carry, but it also exposes some limitations. For example, due to the relatively simple structure, the existing foldable ruler can only perform straight line measurements and cannot meet the needs of angle measurement; at the same time, in actual operation, the user needs to manually fix the detection ruler, which not only increases the complexity of the work, but also reduces the accuracy of the measurement. In addition, in order to complete different measurement tasks, workers usually need to carry a variety of special tools, such as protractors, rulers, etc., and frequently change tools during use, which greatly limits work efficiency.

[0004] In summary, the current construction measurement tools have the following problems: first, the functions are too single and cannot fully meet the diverse measurement needs of drawing and construction sites; second, the existing goniometers lack stability when manually adjusting the angle, and the pointer is easily offset, resulting in inaccurate measurements; third, small angle fine-tuning is difficult to achieve, which limits the accuracy of angle settings; finally, measurement tools are frequently interchanged, which increases the workload. Summary of the invention

[0005] In view of the problems pointed out in the above background technology, the present invention provides a multifunctional measuring ruler which is a combination of a protractor and a folding ruler and a method for using the same.

[0006] The solution adopted by the present invention to solve the technical problem is: a multifunctional detection ruler, including a protractor and a folding ruler, wherein the protractor includes a semicircular disk body, a central axis is arranged at the center of the semicircular disk body, and a pointer is mounted on the central axis; the folding ruler includes a plurality of scale blades, the heads and tails of the plurality of scale blades are hinged, and shaft holes are respectively arranged at both ends of the folding ruler, wherein the shaft hole at one end is mounted on the central axis, and a tail plate is installed on the shaft hole at the other end, and a suction cup is arranged on the tail plate for adsorbing and fixing on the surface of an object; a fixing component is installed below the protractor, and the fixing component includes a slot plate, a groove is arranged in the middle of the slot plate, and the straight edge of the protractor can be inserted into the groove of the slot plate, and a suction cup is fixed on the side of the slot plate, and the protractor is fixed on the surface of the object to be measured through the suction cup.

[0007] Furthermore, the two ends of the scale blade are semicircular, a flat hole is provided in the middle of the scale blade, the two ends of the flat hole are semicircular, the semicircular ends of the flat hole and the semicircular ends of the scale blade are concentric structures, and multiple scale blades are connected end to end, so that the flat holes on adjacent scale blades overlap, and a lock is inserted in the overlapping flat holes, and the lock is a rotatably set screw and nut, the screw can slide along the flat hole, and the adjacent scale blades are moved or fixed by loosening or tightening the nut.

[0008] Furthermore, a group of fixed blocks are fixed in the groove of the slot plate, guide rods are installed between the fixed blocks, a group of sliders are symmetrically mounted on the guide rods, springs are installed between the sliders, plug rods and levers are provided on the sliders, strip holes are provided on the groove wall of the slot plate, and the levers on the two sliders pass through the strip holes and protrude out of the slot plate; notches are provided at positions between the sliders corresponding to the straight sides of the protractor, corresponding sockets are provided on the side walls corresponding to the notches in the transverse direction, the plug rods on the sliders extend to the sockets on the adjacent sides and are inserted into the sockets under the support of the springs, thereby installing the slot plate on the protractor.

[0009] Furthermore, the multifunctional detection ruler also includes an angle adjustment component, which includes a shell, in which a sliding shaft is transversely inserted, and a worm segment and a limit ring segment are arranged on the sliding shaft; a sleeve is arranged on the central axis of the protractor, a fixed pointer is extended on the sleeve, and a thin gear is concentrically fixed on the sleeve, and the thin gear is meshed with the worm segment on the sliding shaft; a piston cylinder is arranged on one end of the sliding shaft, a reciprocating piston is arranged in the piston cylinder, and the piston cylinder is divided into two chambers by the reciprocating piston, and the two chambers are respectively provided with an air inlet and an exhaust hole, and a one-way valve is installed on the air inlet and the exhaust hole, so as to control the air intake of the air inlet and the exhaust of the exhaust hole; a guide groove is arranged on the inner wall of the piston cylinder, and a limit block is arranged on the reciprocating piston, and the limit block of the reciprocating piston is inserted in the guide groove of the piston cylinder, so that the reciprocating piston moves back and forth along the axial direction of the piston cylinder, and a connecting rod is arranged on the reciprocating piston, and a knob is arranged on the outer end of the connecting rod.

[0010] The limiting ring segment is matched with a limiting support block, and an airbag spring is installed between the limiting support block and the shell. One end of the airbag spring is fixed on the shell, and the other end presses the limiting support block against the limiting ring groove of the limiting ring segment of the sliding shaft. The airbag of the airbag spring is connected to the air inlet holes of the two chambers of the piston cylinder through the main air pipe, thereby connecting the piston cylinder and the airbag spring.

[0011] The limiting support block is provided with a clamping plate that can be clamped in the annular groove. The upper end face of the clamping plate is set to be an arc concentric with the sliding shaft. When the clamping plate is clamped in the annular groove, the arc-shaped upper end face can have a larger contact area with the annular groove, ensuring the reliability of support and limiting.

[0012] Furthermore, the airbag spring is formed by wrapping a compression spring in an airbag.

[0013] Furthermore, anti-slip grooves are arranged on the outer surface of the knob.

[0014] Furthermore, the airbag of the airbag spring is manufactured by sewing or other non-completely sealed methods.

[0015] Furthermore, the outer end of the central shaft is provided with an external thread, and a nut is installed on the central shaft. The nut is screwed onto the thread at the outer end of the central shaft, and the pointer is restricted by the nut to prevent the pointer from escaping from the central shaft.

[0016] Furthermore, the end of the folding ruler connected to the protractor is provided with an extension section, the extension section is provided with an axial hole, and the folding ruler is sleeved on the central axis of the protractor through the axial hole. The pointer of the protractor is close to the disc of the protractor, and the folding ruler is located above the pointer.

[0017] Beneficial effects of the invention: The invention provides a multifunctional measuring ruler, which can realize the organic combination of straight line and angle measurement, and has a quick fixing function to reduce manual intervention and improve measurement accuracy and work efficiency. At the same time, the measuring ruler also improves the portability and ease of use of the measuring ruler, providing a more convenient and efficient solution for professionals in the construction industry.

[0018] The present invention can achieve rapid adjustment and precise setting of the pointer angle by introducing an angle adjustment component, including the coordinated use of a thin gear and a worm segment, and solves the problem of angle deviation that may occur during manual adjustment, thereby improving the accuracy of measurement. Pulling the sliding shaft can quickly change the pointer angle, and rotating the sliding shaft can accurately adjust the pointer, providing a more convenient and accurate operation method for angle measurement. At the same time, the meshing of the worm and the thin gear can fix the position of the pointer to avoid the deviation of the pointer during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the multifunctional detection ruler of the present invention; Figure 2 It is a combined schematic diagram of a multifunctional detection ruler; Figure 3 It is a schematic diagram of the protractor disc structure; Figure 4 It is a schematic diagram of the protractor pointer structure; Figure 5 It is a schematic diagram of the structure of the fixed component; Figure 6 is a cross-sectional view of the connection between the fixed assembly and the protractor; Figure 7 yes Figure 6 Enlarged view of part A in the middle; Figure 8 is a schematic diagram of the angle adjustment component structure; Fig. 9 is a schematic diagram of the cross-sectional structure of the angle adjustment component; Fig.10 It is the operating principle diagram of the air bag spring and piston cylinder.

[0020] Numbers in the figure: protractor 1, folding ruler 2, fixing component 3, angle adjustment component 4, suction cup 5, disc body 101, pointer 102, central axis 103, thin gear 104, sleeve 105, notch 106, jack 107, ruler 201, lock buckle 202, flat hole 203, tail plate 204, slot plate 301, fixing block 302, guide rod 303, spring 304, slider 305, plug rod 306, lever 307, housing 401, sliding shaft 402, worm segment 403, limiting ring segment 404, limiting support block 405, airbag spring 406, main air pipe 407, piston cylinder 408, one-way valve 409, knob 410, air inlet 411, exhaust hole 412, reciprocating piston 413. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below.

[0022] Embodiment 1: In order to meet the needs of multifunctional measurement and portability of construction drawing in the construction industry, the present invention provides a Figure 1 The multifunctional detection ruler shown comprises a protractor 1 and a folding ruler 2 .

[0023] like Figure 3 As shown, the protractor 1 comprises a semicircular disk body 101 , a circular carrier plate is arranged at the center of the semicircular disk body 101 , a central axis 103 is arranged on the circular carrier plate, and an outer end of the central axis 103 is arranged with an external thread.

[0024] The circumferential edge of the protractor 1 disk body 101 is provided with recessed or protruding scale lines, and the disk body 101 is also provided with a hollow arc concentric with the disk body 101, and the central axis 103 is provided with a pointer 102. Figure 4 As shown, the tip of the pointer 102 faces the scale line of the vector angle meter 1 , and a sleeve 105 is provided at the other end of the pointer 102 . The pointer 102 is sleeved on the central axis 103 through the sleeve 105 , and the actual body of the pointer 102 crosses the hollow area of ​​the disk body 101 .

[0025] The central shaft 103 is also provided with a nut which is screwed onto the thread at the outer end of the central shaft 103 . The nut limits the pointer 102 to prevent the pointer 102 from coming off the central shaft 103 .

[0026] like Figure 2 As shown, the folding ruler 2 includes a plurality of blades 201, which are connected end to end to form a foldable ruler, a flat hole 203 is provided in the middle of the blade 201, and the two ends of the flat hole 203 are semicircular, and the flat holes 203 between adjacent blades 201 overlap, and a lock buckle 202 is inserted in the overlapping flat holes 203, and the adjacent blades 201 are connected by the lock buckle 202. Further, the two ends of the blade 201 are also set to be semicircular, and the semicircle of the blade 201 is concentric with the semicircle at the end of the flat hole 203.

[0027] The lock buckle 202 is a screw and nut that are screwed together. The shaft of the screw is inserted through the overlapping flat holes 203, and the nut is screwed on the screw. By loosening or tightening the nut, the adjacent scale blades 201 can be pressed together or loosened, thereby fixing or rotating the adjacent scale blades 201.

[0028] An extension section is provided at the end of the blade 201 of the folding ruler 2 connected to the protractor 1, and an axial hole is provided on the extension section. The folding ruler 2 is sleeved on the central axis 103 of the protractor 1 through the axial hole. The pointer 102 of the protractor 1 is close to the disk body 101 of the protractor 1, and the folding ruler 2 is located above the pointer 102. The tightness between the folding ruler 2, the pointer 102 and the disk body 101 is controlled by screwing a nut on the central axis 103. The outer end of the blade 201 of the folding ruler 2 away from the protractor 1 is sleeved with a tail plate 204 through a flat hole 203. The tail plate 204 and the protractor 1 are located on the same side of the folding ruler 2, and a suction cup 5 is provided on the side of the tail plate 204 facing the protractor 1. The suction cup 5 is adsorbed on the surface of the object so that the folding ruler 2 can be better used for measurement or marking.

[0029] Take the straight edge of protractor 1 as the bottom, such as Figure 1 and Figure 2As shown, a fixing assembly 3 is installed on the lower side of the protractor 1, and the fixing assembly 3 includes a slot plate 301, and the slot plate 301 is concave in shape, and a groove is arranged in the middle of the slot plate 301, and the straight edge of the protractor 1 is inserted into the groove. A series of suction cups 5 are evenly fixed on the outer surface of the slot plate 301, and the slot plate 301 can be adsorbed on the surface of the object through the suction cups 5, which is convenient for angle measurement and drawing. With the center of the protractor 1 as the midpoint, the fixing assembly 3 is installed on the straight edges on both sides of the center of the protractor 1.

[0030] like Figure 5 As shown, the groove of the slot plate 301 is used to connect a connecting assembly for connecting the protractor 1, and the connecting assembly includes fixed blocks 302 symmetrically fixed in the groove, a guide rod 303 is installed between the fixed blocks 302, two symmetrical sliders 305 are mounted on the guide rod 303, and a spring 304 is mounted on the guide rod 303 between the sliders 305.

[0031] A through strip hole is provided on the side of the slot plate 301 , and a lever 307 passing through the strip hole is provided on the side of the slider 305 . The end of the lever 307 protrudes out of the slot plate 301 , and the slider 305 can be operated to move on the guide rod 303 through the lever 307 .

[0032] like Figure 6 and Figure 7 As shown, the straight edge of the protractor 1 is inserted into the groove of the slot plate 301, and the area between the straight edge and the slider 305 is provided with a notch 106, and the notch 106 is provided with a plug hole 107 on both sides, and the slider 305 adjacent to the plug hole 107 is provided with a plug rod 306 that can be inserted into the plug hole 107. In the absence of external force, the two sliders 305 are extended to both sides under the thrust of the spring, and the plug rod 306 is inserted into the plug hole 107, thereby connecting the protractor 1 with the slot plate 301. At the same time, a series of suction cups 5 are provided on the outer surface of the slot plate 301 facing the object. When in use, the slot plate 301 can be fixed on the surface of the object by suction through the suction cup 5, thereby fixing the protractor 1, which is convenient for the staff to measure and draw.

[0033] When the protractor 1 needs to be moved for use, the lever 307 can be pushed toward the middle to move the two sliders 305 toward the middle, so that the insertion rod 306 is disengaged from the insertion hole 107, thereby removing the protractor 1 from the slot plate 301 for separate use.

[0034] Specific operation method: the pointer 102 can point to different positions by rotating around the central axis 103 of the protractor 1. The pointer 102 points to the scale of the protractor 1 to measure the angle. The nut on the central axis 103 is turned downward to make it close to the sleeve 105 of the pointer 102, so that the pointer 102 can be fixed for easy reading.

[0035] Two adjacent blades 201 of the folding ruler 2 can rotate around the lock buckle 202 to adjust the angle between the two blades 201 , and the two adjacent blades 201 are fixed by tightening the lock buckle 202 .

[0036] When multiple rulers 201 are arranged in a straight line, the folding ruler 2 is rotated to be located on the upper end surface of the protractor 1. The folding ruler 2 can replace the pointer 102 to measure angles and draw lines. At the same time, the angles between the multiple rulers 201 can be adjusted arbitrarily, so that irregular lines can be drawn and lengths can be measured.

[0037] The suction cups 5 on the slot plate 301 and the tail plate 204 can be attached to the object to be measured and marked, and the user can free his hands to perform other operations. When it is not necessary to fix it on the object to be measured, the lever 307 can be moved, and the two levers 307 can be moved closer to each other with force, so as to compress the spring 304. The two sliders 305 slide on the surface of the guide rod 303, so that the insertion rod 306 can be separated from the socket 107, and then the protractor 1 can be removed from the slot plate 301 for easy use.

[0038] Embodiment 2: The pointer 102 and the scale blade 201 are fixed by pressing with a lock buckle 202 or a nut, etc., which may cause wear and shaking, and inconvenient operation. In addition, the manual adjustment of the position of the pointer 102 has limited accuracy and cannot be accurately adjusted.

[0039] Based on this, an angle adjustment component 4 is provided in this embodiment. The angle adjustment component 4 is installed below the central axis 103 of the protractor 1 , and the angle position of the pointer 102 is fixed and adjusted by the angle adjustment component 4 .

[0040] Specific as Figure 4 and Figure 8 As shown, a thin gear 104 is concentrically fixed on the shaft sleeve 105 of the pointer 102, and a rectangular or circular housing 401 is installed below the protractor 1. The housing 401 can be fixed on the slot plate 301. The housing 401 is provided with an opening toward the position of the thin gear 104, and the lower side of the thin gear 104 can extend into the housing 401 through the opening.

[0041] like Figure 8 and Fig. 9As shown, a sliding shaft 402 is horizontally placed in the housing 401, and a worm section 403 is provided on the sliding shaft 402. The worm section 403 is provided with an external thread, and the external thread is engaged with the thin gear 104 extending into the housing 401. At the same time, a limiting ring section 404 is also provided on the sliding shaft 402, and a series of ring grooves are evenly provided on the limiting ring section 404. The limiting ring section 404 is also provided with a limiting support block 405, and a clamping plate that can be clamped in the ring groove is provided on the limiting support block 405. The upper end surface of the clamping plate is set to be an arc concentric with the sliding shaft 402. When the clamping plate is clamped in the ring groove, the upper end surface of the arc can have more contact surfaces with the ring groove, ensuring the reliability of support and limiting.

[0042] An airbag spring 406 is installed on the limit support block 405. The airbag spring 406 is composed of a compressed spring wrapped in an airbag. One end of the airbag spring 406 is fixed on the limit block, and the other end is fixed on the inner wall of the housing 401. A main air pipe 407 is connected to the airbag of the airbag spring 406. A piston cylinder 408 is arranged at one end of the sliding shaft 402, and a reciprocating piston 413 is installed in the piston cylinder 408. A guide groove is arranged on the inner wall of the piston cylinder 408, and a limit block is arranged on the reciprocating piston 413. The limit block of the reciprocating piston 413 is inserted into the guide groove of the piston cylinder 408, so that the reciprocating piston 413 can only reciprocate along the axial direction of the piston cylinder 408.

[0043] A connecting rod is fixedly connected to the reciprocating piston 413 , a knob 410 is disposed at the outer end of the connecting rod, and anti-slip grooves are disposed on the outer surface of the knob 410 .

[0044] The reciprocating piston 413 separates the piston cylinder 408 into two chambers. Both chambers are provided with an air inlet 411 and an air exhaust hole 412. A one-way valve 409 is installed on the air inlet 411 and the air exhaust hole 412 to control the air intake through the air inlet 411 and the air exhaust through the air exhaust hole 412. The air inlet holes 411 of the two chambers are connected to the airbag through the main air pipe 407.

[0045] like Fig.10 As shown, by pulling the knob 410, the reciprocating piston 413 moves to the left, the one-way valves 409A1 and A4 are turned on, A2 and A3 are closed, the left chamber is exhausted, and the airbag is sucked in the right chamber, so that the airbag spring 406 contracts, the limiting support block 405 is disengaged from the limiting ring segment 404, and the sliding shaft 402 can move laterally under the pull of the knob 410, and the external thread of the worm segment 403 drives the thin gear 104 to rotate, so that the angle of the pointer 102 can be quickly adjusted.

[0046] Push the knob 410, the reciprocating piston 413 moves to the right side, the one-way valves 409A1 and A4 are closed, A2 and A3 are connected, the right chamber is exhausted, and the airbag is sucked in the left chamber, so that the airbag spring 406 contracts, the limiting support block 405 is disengaged from the limiting ring segment 404, and the sliding shaft 402 can move laterally under the pull of the knob 410, and the external thread of the worm segment 403 drives the thin gear 104 to rotate, so that the angle of the pointer 102 can be quickly adjusted.

[0047] For the convenience of description, the above-mentioned left and right refer to the left and right in the drawings and do not represent any limitation on directions in actual applications.

[0048] Compared with the ordinary worm gear meshing method, the thin gear 104 has less contact surface with the external thread on the worm. When the worm moves laterally, the meshing method between the thin gear 104 and the external thread of the worm can be regarded as the meshing relationship between the rack and the gear, so that the thin gear 104 can be driven to rotate when the sliding shaft 402 moves laterally.

[0049] The above method can be used to quickly adjust the angle position of the pointer. When it is adjusted to a similar angle position, loosen the knob 410, and the airbag spring 406 expands under the elastic force of its own spring. The limit support block 405 is placed in the limit ring groove to fix the position of the worm. At this time, it can be rotated and screwed, and the limit groove block between the reciprocating piston 413 and the piston cylinder 408 is used to rotate the sliding shaft 402, and then the thin gear 104 is driven to rotate through the external thread of the worm segment 403 to accurately adjust the angle position of the pointer 102.

[0050] The airbag of the airbag spring 406 is made by sewing or other non-completely sealed methods, so that at the moment of pushing and pulling the piston, the suction force of the corresponding chamber of the piston cylinder 408 is greater than the speed of the airbag's own air leakage, causing the airbag to shrink under the action of the air pressure difference. When the knob 410 stops pushing and pulling, the airbag will naturally resume the support due to air leakage.

[0051] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A multifunctional detection ruler, characterized in that: The invention comprises a protractor (1) and a folding ruler (2), wherein the protractor (1) comprises a semicircular disk (101), a central axis (103) is arranged at the center of the semicircular disk (101), and a pointer (102) is mounted on the central axis (103); the folding ruler (2) comprises a plurality of scale blades (201), the plurality of scale blades (201) are hinged at their ends, and shaft holes are respectively arranged at both ends of the folding ruler (2), wherein the shaft hole at one end is mounted on the central axis (103), and the shaft hole at the other end is hinged at its end. A tail plate (204) is installed on the shaft hole at the end, and a suction cup (5) is arranged on the tail plate (204) for adsorbing and fixing on the surface of an object; a fixing component (3) is installed below the protractor (1), and the fixing component (3) comprises a slot plate (301), a groove is arranged in the middle of the slot plate (301), and the straight edge of the protractor (1) can be inserted into the groove of the slot plate (301); a suction cup (5) is fixed on the side of the slot plate (301), and the slot plate (301) is fixed to the surface of the object to be measured through the suction cup (5).

2. The multifunctional detection ruler according to claim 1, characterized in that: The two ends of the ruler (201) are semicircular, a flat hole (203) is provided in the middle of the ruler (201), the two ends of the flat hole (203) are semicircular, the semicircular ends of the flat hole (203) and the semicircular ends of the ruler (201) are concentric, and the ends of the rulers (201) are connected end to end, so that the flat holes (203) on adjacent rulers (201) overlap, and a lock buckle (202) is inserted in the overlapping flat holes (203), and the lock buckle (202) is a screw and a nut that are rotatably mounted, and the screw can slide along the flat hole (203), and the adjacent rulers (201) are moved or fixed by loosening or tightening the nut.

3. The multifunctional detection ruler according to claim 1, characterized in that: A group of fixing blocks (302) are also fixed in the groove of the groove plate (301), a guide rod (303) is installed between the fixing blocks (302), a group of sliding blocks (305) are symmetrically mounted on the guide rod (303), springs are installed between the sliding blocks (305), an insertion rod (306) and a lever (307) are arranged on the sliding blocks (305), a strip hole is arranged on the groove wall of the groove plate (301), and the levers (307) on the two sliding blocks (305) both pass through the strip hole and protrude outside the groove plate (301); A notch (106) is provided at a position between the straight side edges of the protractor (1) and the slider (305), and a corresponding insertion hole (107) is provided on a side wall corresponding to the notch (106) in the transverse direction. The insertion rod (306) on the slider (305) extends toward the insertion hole (107) on the adjacent side and is inserted into the insertion hole (107) under the support of a spring, thereby mounting the slot plate (301) on the protractor (1).

4. The multifunctional detection ruler according to claim 1, characterized in that: The multifunctional detection ruler further comprises an angle adjustment component (4), wherein the angle adjustment component (4) comprises a housing (401), a sliding shaft (402) being inserted transversely into the housing (401), and a worm section (403) and a limit ring section (404) being arranged on the sliding shaft (402); A shaft sleeve (105) is sleeved on the central axis (103) of the protractor (1), a pointer (102) is extended and fixed on the shaft sleeve (105), and a thin gear (104) is coaxially fixed on the shaft sleeve (105), and the thin gear (104) is meshed with a worm segment (403) on the sliding shaft (402); A piston cylinder (408) is provided at one end of the sliding shaft (402), and a reciprocating piston (413) is sleeved in the piston cylinder (408). The reciprocating piston (413) divides the piston cylinder (408) into two chambers, and the two chambers are respectively provided with an air inlet (411) and an air outlet (412). Both the air inlet (411) and the air outlet (412) are installed with a one-way valve (409), so as to control air intake through the air inlet (411) and air discharge through the air outlet (412); A guide groove is provided on the inner wall of the piston cylinder (408), a limit block is provided on the reciprocating piston (413), the limit block of the reciprocating piston (413) is inserted into the guide groove of the piston cylinder (408), so that the reciprocating piston (413) reciprocates along the axial direction of the piston cylinder (408), a connecting rod is provided on the reciprocating piston (413), and a knob (410) is provided on the outer end of the connecting rod; The limiting ring segment (404) is matched with a limiting support block (405), and an airbag spring (406) is installed between the limiting support block (405) and the housing (401). One end of the airbag spring (406) is fixed on the housing (401), and the other end presses the limiting support block (405) against the limiting ring groove of the limiting ring segment (404) of the sliding shaft (402). The airbag of the airbag spring (406) is connected to the air inlet holes (411) of the two chambers of the piston cylinder (408) through the main air pipe (407), so that the piston cylinder (408) and the airbag spring (406) are connected.

5. The multifunctional detection ruler according to claim 1, characterized in that: The outer end of the central shaft (103) is provided with an external thread, and a nut is mounted on the central shaft (103). The nut is screwed onto the thread at the outer end of the central shaft (103), and the pointer (102) is restricted by the nut to prevent the pointer (102) from coming off the central shaft (103).

6. The multifunctional detection ruler according to claim 2, characterized in that: An extension section is provided at the end of the scale piece (201) of the folding ruler (2) connected to the protractor (1), and an axial hole is provided on the extension section. The folding ruler (2) is sleeved on the central axis (103) of the protractor (1) through the axial hole, wherein the pointer (102) of the protractor (1) is closely attached to the disk (101) of the protractor (1), and the folding ruler (2) is located above the pointer (102).

7. The multifunctional detection ruler according to claim 4, characterized in that: The limiting support block (405) is provided with a clamping plate that can be clamped in the annular groove. The upper end surface of the clamping plate is arranged to be an arc concentric with the sliding shaft (402). When the clamping plate is clamped in the annular groove, the upper end surface of the arc can have a large contact surface with the annular groove, thereby ensuring the reliability of support and limiting.

8. The multifunctional detection ruler according to claim 4, characterized in that: The airbag spring (406) is formed by enclosing a compression spring in an airbag.

9. The multifunctional detection ruler according to claim 4, characterized in that: Anti-slip grooves are provided on the outer surface of the knob (410).

10. The multifunctional detection ruler according to claim 4, characterized in that: The airbag of the airbag spring (406) is made by sewing or other non-completely sealed methods.

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