Multi-purpose detection ruler

Abstract

The application provides a multifunctional detection ruler, which comprises an angle gauge and a folding ruler, the center of the angle gauge is provided with a center shaft, and a pointer is sleeved on the center shaft; the two ends of the folding ruler are respectively provided with shaft holes, the shaft hole at one end is sleeved on the center shaft, and a tail plate is installed on the shaft hole at the other end; a fixing assembly is installed below the angle gauge, and a suction cup is fixed on the side of the groove plate of the fixing assembly and the tail plate, and the suction cup is fixed on the surface of an object to be measured; the multifunctional detection ruler can realize the organic combination of straight line and angle measurement, has a quick fixing function, reduces manual intervention, and improves measurement accuracy and work efficiency; meanwhile, the detection ruler improves portability and ease of use, and provides a more convenient and efficient solution for professionals in the construction industry.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of construction detection ruler, and particularly relates to a multifunctional detection ruler. BACKGROUND

[0002] In the construction industry, accurate measurement is one of the key factors to ensure the safety and rationality of building structure. Whether it is the drawing of planning stage or the size confirmation in the construction process, the detection ruler as a basic tool plays an indispensable role. It not only affects the effective use of resources and the maximization of space design, but also directly relates to the quality and efficiency of the final project. Therefore, a detection ruler with excellent performance and multiple functions is essential to improve the productivity of the construction industry.

[0003] The folding drawing ruler on the market at present is mainly composed of multiple scales combined together. These scales are connected by rotation through the cooperation of the convex on one end and the groove on the other end, thereby supporting the folding function. This design is convenient for carrying, but at the same time, it also exposes some limitations. For example, due to the relatively simple structure, the existing folding scale can only be used for straight line measurement, and cannot meet the demand 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 measurement accuracy. In addition, in order to complete different measurement tasks, workers usually need to carry multiple special tools, such as protractor, ruler, etc., and frequently change tools during use, which greatly limits the work efficiency.

[0004] In summary, the existing construction measurement tools at this stage have the following problems: first, the function is too single, and cannot fully meet the diversified measurement needs of drawing and construction site; second, the existing protractor lacks stability when manually adjusting the angle, and the pointer is easy to deviate, resulting in inaccurate measurement; third, small angle fine adjustment is difficult to achieve, limiting the accuracy of angle setting; finally, the measurement tools are frequently used interchangeably, increasing the work burden. SUMMARY

[0005] In view of the problems pointed out in the above background art, the present application provides a multifunctional detection ruler combined with a protractor and a folding ruler and a use method thereof.

[0006] The utility model solves its technical problem and adopts the scheme that a multifunctional detection ruler includes an angle gauge and a folding ruler, wherein the angle gauge includes a semicircular disc body, a central shaft is arranged at the center of the semicircular disc body, and a pointer is sleeved on the central shaft; the folding ruler includes multiple ruler pieces, the first end and the tail of the multiple ruler pieces are hingedly connected, shaft holes are arranged at the two ends of the folding ruler respectively, the shaft hole at one end is sleeved on the central shaft, a tail plate is mounted on the shaft hole at the other end, a suction cup is arranged on the tail plate and used for adsorbing and fixing on the surface of an object, and a fixing assembly is mounted below the angle gauge; the fixing assembly includes a groove plate, a groove is arranged in the middle of the groove plate, the straight edge of the angle gauge can be clamped in the groove of the groove plate, a suction cup is fixed on the side of the groove plate and used for fixing on the surface of an object to be measured.

[0007] Further, the two ends of the ruler piece are semicircular, a flat hole is arranged in the middle of the ruler piece, the two ends of the flat hole are semicircular, the semicircular ends of the flat hole and the semicircular ends of the ruler piece are concentric, the first end and the tail of the multiple ruler pieces are connected, the flat holes on the adjacent ruler pieces are overlapped, a lock catch is inserted in the overlapped flat holes, the lock catch is a screw and a nut that are rotatably sleeved, the screw can slide along the flat hole, and the adjacent ruler pieces are moved or fixed by loosening or tightening the nut.

[0008] Further, a plurality of fixing blocks are further fixed in the groove of the groove plate, a guide rod is mounted between the fixing blocks, a plurality of sliding blocks are symmetrically sleeved on the guide rod, a spring is mounted between the sliding blocks, an insertion rod and a push rod are arranged on the sliding blocks, a strip-shaped hole is arranged on the wall of the groove of the groove plate, the push rods on the two sliding blocks protrude out of the groove plate through the strip-shaped hole, and an opening is arranged at the position between the sliding blocks corresponding to the straight edge of the angle gauge, corresponding insertion holes are arranged on the side walls corresponding to the opening in the transverse direction, the insertion rod on the sliding block extends to the adjacent insertion hole and is inserted in the insertion hole under the support of the spring, so that the groove plate is mounted on the angle gauge.

[0009] Further, the multifunctional detection ruler further includes an angle adjusting assembly, the angle adjusting assembly includes a shell, a sliding shaft is transversely inserted in the shell, a worm segment and a limiting ring segment are arranged on the sliding shaft, a shaft sleeve is sleeved on the central shaft of the angle gauge, the pointer is fixed on the shaft sleeve, a thin gear wheel is concentrically fixed on the shaft sleeve, the thin gear wheel is engaged with the worm segment on the sliding shaft, one end of the sliding shaft is provided with a piston cylinder, a reciprocating piston is sleeved in the piston cylinder, the piston cylinder is divided into two chambers by the reciprocating piston, an air inlet hole and an air outlet hole are arranged on the two chambers respectively, one-way valves are mounted on the air inlet hole and the air outlet hole, so as to control the air inlet of the air inlet hole and the air outlet of the air outlet hole, a guide groove is arranged on the inner wall of the piston cylinder, a limiting block is arranged on the reciprocating piston, the limiting block of the reciprocating piston is sleeved in the guide groove of the piston cylinder, so that the reciprocating piston moves axially along the piston cylinder, a connecting rod is arranged on the reciprocating piston, and a rotary knob is arranged on the outer end of the connecting rod.

[0010] The limiting ring segment matches and installs the limiting support block, the limiting support block is installed between the shell and the air bag spring, one end of the air bag spring is fixed on the shell, the other end presses the limiting support block on the limiting ring groove of the sliding shaft limiting ring segment, the air bag of the air bag spring is connected with the air inlet hole of the two chambers of the piston cylinder through the main air pipe, so that the piston cylinder and the air bag spring are communicated.

[0011] A clamping plate capable of being clamped in the ring groove is arranged on the limiting support block, the upper end surface of the clamping plate is arranged as an arc concentric with the sliding shaft, 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.

[0012] Further, the air bag spring is composed of a compression spring wrapped in the air bag.

[0013] Further, anti-skid lines are arranged on the outer surface of the rotating knob.

[0014] Further, the air bag of the air bag spring is made by sewing or other non-fully sealed ways.

[0015] Further, an outer thread is arranged on the outer end of the central shaft, a nut is arranged on the central shaft, the nut is screwed on the thread of the outer end of the central shaft, the pointer is limited by the nut, and the pointer is prevented from being pulled out of the central shaft.

[0016] Further, an extension section is arranged on the end of the ruler piece connected with the protractor, an axle hole is arranged on the extension section, and the folding ruler is sleeved on the central shaft of the protractor through the axle hole.

[0017] The present application provides a multifunctional detection 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 detection ruler also improves the portability and ease of use of the detection ruler, and provides more convenient and efficient solutions for professionals in the construction industry.

[0018] The present application introduces an angle adjusting assembly, including the cooperation of a thin gear and a worm segment, which can realize the rapid adjustment and accurate setting of the angle of the pointer, solve the problem of angle deviation that may occur during manual adjustment, and improve the accuracy of measurement. Pulling the sliding shaft can quickly change the angle of the pointer, and rotating the sliding shaft can accurately adjust the pointer, providing a more convenient and accurate operation mode for angle measurement, and 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 DRAWINGS

[0019] Figure 1 is a perspective structural schematic view of the multifunctional detection ruler of the present application;

[0020] Figure 2 is a combined schematic diagram of the multifunctional measuring ruler;

[0021] Figure 3 is a schematic diagram of the protractor disc structure;

[0022] Figure 4 is a schematic diagram of the protractor pointer structure;

[0023] Figure 5 is a schematic diagram of the fixing assembly structure;

[0024] Figure 6 is a sectional view of the fixing assembly and the protractor connection;

[0025] Figure 7 is Figure 6 is an enlarged view of part A in FIG. 1;

[0026] Figure 8 is a schematic diagram of the angle adjustment assembly structure;

[0027] Figure 9 is a sectional schematic diagram of the angle adjustment assembly;

[0028] Figure 10 is a schematic diagram of the air bag spring and the piston cylinder operation principle.

[0029] In the figure: protractor 1, folding ruler 2, fixing assembly 3, angle adjustment assembly 4, suction cup 5, disc body 101, pointer 102, central shaft 103, thin gear 104, shaft sleeve 105, notch 106, insertion hole 107, ruler piece 201, lock catch 202, flat hole 203, tail plate 204, slot plate 301, fixing block 302, guide rod 303, spring 304, sliding block 305, insertion rod 306, lever 307, outer shell 401, sliding shaft 402, worm segment 403, limiting ring segment 404, limiting support block 405, air bag spring 406, main air pipe 407, piston cylinder 408, one-way valve 409, twist 410, air inlet hole 411, air outlet hole 412, reciprocating piston 413. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below.

[0031] Example 1: In order to realize the multifunctional measurement and portability of construction drawing in the construction industry, the present application provides a multifunctional measuring ruler as shown in FIG. 1, which comprises a protractor 1 and a folding ruler 2. Figure 1

[0032] As shown in FIG. 2, the protractor 1 comprises a disc body 101, a pointer 102, a central shaft 103 and a thin gear 104. Figure 3 ​As shown, the protractor 1 comprises a semicircular disc 101, a circular carrier plate is arranged at the center of the semicircular disc 101, and a central shaft 103 is arranged on the circular carrier plate, and the outer end of the central shaft 103 is provided with external threads.

[0033] The circumferential edge of the disc 101 of the protractor 1 is provided with recessed or protruding scale lines, and the disc 101 is further provided with a hollow arc shape concentric with the disc 101, and the pointer 102 is sleeved on the central shaft 103. Figure 4 As shown, the tip of the pointer 102 is directed towards the scale lines of the protractor 1, and the other end of the pointer 102 is provided with a shaft sleeve 105, and the pointer 102 is sleeved on the central shaft 103 through the shaft sleeve 105, and the body of the pointer 102 crosses the hollow area of the disc 101.

[0034] A screw cap is further mounted on the central shaft 103, and the screw cap is screwed on the threads of the outer end of the central shaft 103, and the pointer 102 is limited by the screw cap to prevent the pointer 102 from being detached from the central shaft 103.

[0035] As shown, Figure 2 The folding ruler 2 comprises a plurality of ruler pieces 201 connected end to end to form a straight ruler capable of being folded and unfolded, and a flat hole 203 is arranged in the middle of the ruler piece 201, the two ends of the flat hole 203 are semicircular, the flat holes 203 of adjacent ruler pieces 201 are coincident, a lock catch 202 is sleeved in the coincident flat holes 203, and the adjacent ruler pieces 201 are connected through the lock catch 202. Further, the two ends of the ruler piece 201 are also semicircular, and the semicircular shape of the ruler piece 201 and the semicircular shape of the end of the flat hole 203 have the same center.

[0036] The lock catch 202 adopts a screw and a screw cap, the shank of the screw penetrates through the coincident flat holes 203, and the screw cap is screwed on the screw, and the adjacent ruler pieces 201 can be tightly attached or relaxed by tightening or loosening the screw cap, so as to fix or rotate the adjacent ruler pieces 201.

[0037] The end of the ruler piece 201 of the folding ruler 2 connected with the protractor 1 is provided with an extension section, an axle hole is arranged on the extension section, and the folding ruler 2 is sleeved on the central shaft 103 of the protractor 1 through the axle hole. The pointer 102 of the protractor 1 is tightly attached to the disc 101 of the protractor 1, the folding ruler 2 is located above the pointer 102, and the tightness between the folding ruler 2, the pointer 102 and the disc 101 is controlled by the screw cap screwed on the central shaft 103. The outer end of the ruler piece 201 of the folding ruler 2 away from the protractor 1 is sleeved with a tail plate 204 through the flat hole 203. The tail plate 204 is located on the same side of the folding ruler 2 as the protractor 1, and a suction cup 5 is arranged on the side of the tail plate 204 facing the protractor 1, which can better use the folding ruler 2 for measurement or marking by being adsorbed on the surface of an object through the suction cup 5.

[0038] With the straight edge of the protractor 1 as the lower side, as shown in Figure 1 and Figure 2 a fixing assembly 3 is installed on the lower side of the protractor 1, which comprises a groove plate 301, the groove plate 301 is in the shape of a concave letter, a groove is arranged in the middle of the groove plate 301, the straight edge of the protractor 1 is sleeved in the groove, a series of suction cups 5 are evenly fixed on the outer side of the groove plate 301, the groove plate 301 can be adsorbed on the surface of an object through the suction cups 5, which is convenient for angle measurement and drawing. With the center of the protractor 1 as the midpoint, a fixing assembly 3 is installed on the straight edge on both sides of the center of the protractor 1.

[0039] As shown in Figure 5 the groove of the groove plate 301 is used to connect the protractor 1, the connecting assembly comprises fixing blocks 302 symmetrically fixed in the groove, a guide rod 303 is installed between the fixing blocks 302, two symmetric sliding blocks 305 are sleeved on the guide rod 303, and springs 304 are sleeved on the guide rod 303 between the sliding blocks 305.

[0040] And a through strip-shaped hole is arranged on the side of the groove plate 301, a lever 307 is arranged on the side of the sliding block 305 and passes through the strip-shaped hole, the end of the lever 307 protrudes out of the groove plate 301, and the sliding block 305 can be moved on the guide rod 303 by operating the lever 307.

[0041] As shown in Figure 6 and Figure 7 the straight edge of the protractor 1 is sleeved in the groove of the groove plate 301, and an opening 106 is arranged in the area between the sliding blocks 305, a plug hole 107 is arranged on both sides of the opening 106, and a plug rod 306 is arranged on the sliding block 305 near the plug hole 107 and can be inserted into the plug hole 107. Under the action of the spring, the two sliding blocks 305 are expanded to both sides, the plug rod 306 is inserted into the plug hole 107, so that the protractor 1 and the groove plate 301 are connected together. At the same time, a series of suction cups 5 are arranged on the outer surface of the groove plate 301 facing the object, and the groove plate 301 can be adsorbed and fixed on the surface of the object through the suction cups 5 during use, so as to fix the protractor 1, which is convenient for staff to measure and draw.

[0042] When the protractor 1 needs to be moved, the lever 307 can be pulled to the middle to make the two sliding blocks 305 close to the middle, so that the plug rod 306 is pulled out of the plug hole 107, and the protractor 1 is separated from the groove plate 301 and used alone.

[0043] Specific operation mode: rotate the pointer 102 around the center shaft 103 of the protractor 1, so that the pointer 102 can point to different positions, and the pointer 102 points to the scale of the protractor 1 to measure the angle, and the nut on the center shaft 103 is turned down to make it close to the shaft sleeve 105 of the pointer 102, so as to fix the pointer 102 and facilitate reading.

[0044] Two adjacent scale pieces 201 of folding ruler 2 can rotate around lock buckle 202, so as to adjust the angle between two scale pieces 201, and fix two adjacent scale pieces 201 by fastening lock buckle 202.

[0045] When multiple scale pieces 201 are arranged in a straight line, rotating folding ruler 2 to be located at the upper end surface of protractor 1, folding ruler 2 can replace pointer 102 to measure angle, and can perform line marking, and meanwhile, the angle between multiple scale pieces 201 can be adjusted arbitrarily, so that irregular lines can be drawn and length can be measured.

[0046] By means of suction cups 5 on groove plate 301 and tail plate 204, protractor 1 can be adsorbed on an object to be measured and marked, and the user can free both hands to perform other operations, when it is not necessary to be fixed on the object to be measured, the user can move push rods 307 to compress springs 304, and two sliding blocks 305 can slide on the surface of guide rod 303, so that insertion rod 306 can be separated from insertion hole 107, and then protractor 1 can be removed from groove plate 301, which is convenient for use.

[0047] In embodiment 2, pointer 102 and scale piece 201 are fixed by lock buckle 202 or nut, and there are problems of wear and swing, inconvenient operation, limited accuracy of manual adjustment of position of pointer 102, and inability to perform accurate adjustment.

[0048] Therefore, in the present embodiment, an angle adjusting assembly 4 is provided, which is installed below central shaft 103 of protractor 1, and is used to fix and adjust the angle position of pointer 102.

[0049] Specifically, as shown in Figure 4 and Figure 8 , a thin gear 104 is fixed concentrically on shaft sleeve 105 of pointer 102, a rectangular or circular shell 401 is installed below protractor 1, shell 401 can be fixed on groove plate 301, shell 401 is provided with an opening towards the position of thin gear 104, and the lower side of thin gear 104 can extend into shell 401 through the opening.

[0050] As shown in Figure 8 and Figure 9As shown, a sliding shaft 402 is horizontally arranged in the shell 401, and a worm segment 403 is arranged on the sliding shaft 402, the worm segment 403 is provided with external threads, and the external threads are engaged with the thin gear 104 extending into the shell 401. Meanwhile, a limiting ring segment 404 is arranged on the sliding shaft 402, and the limiting ring segment 404 is uniformly provided with a series of ring grooves. The limiting ring segment 404 is further provided with a limiting support block 405, and the limiting support block 405 is provided with a clamping plate capable of being clamped in the ring groove, and the upper end surface of the clamping plate is arranged as 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 between the ring groove, thereby ensuring the reliability of the support and the limitation.

[0051] The gas bag spring 406 is installed on the limiting support block 405, and the gas bag spring 406 is composed of a compression spring wrapped in a gas bag. One end of the gas bag spring 406 is fixed on the limiting block, and the other end is fixed on the inner wall of the shell 401. The gas bag spring 406 is connected with a total gas pipe 407, and a piston cylinder 408 is arranged at one end of the sliding shaft 402, and a reciprocating piston 413 is sleeved in the piston cylinder 408. The inner wall of the piston cylinder 408 is provided with a guide groove, and the reciprocating piston 413 is provided with a limiting block, and the limiting block of the reciprocating piston 413 is clamped in the guide groove of the piston cylinder 408, so that the reciprocating piston 413 can only move axially along the piston cylinder 408.

[0052] The reciprocating piston 413 is fixedly connected with a connecting rod, and the outer end of the connecting rod is provided with a rotating knob 410, and the outer surface of the rotating knob 410 is provided with anti-skid lines.

[0053] The reciprocating piston 413 divides the piston cylinder 408 into two chambers, and the two chambers are provided with air inlet holes 411 and air outlet holes 412, and one-way valves 409 are installed on the air inlet holes 411 and the air outlet holes 412, so as to control the air inlet of the air inlet holes 411 and the air outlet of the air outlet holes 412. The air inlet holes 411 of the two chambers are communicated with the gas bag through the total gas pipe 407.

[0054] As shown, Figure 10 Pull the rotating knob 410, and the reciprocating piston 413 moves to the left, the one-way valves 409A1, A4 are turned on, and A2, A3 are closed, the left chamber is exhausted, and the right chamber is pumped to the gas bag, so that the gas bag spring 406 is contracted, the limiting support block 405 is separated from the limiting ring segment 404, and the sliding shaft 402 can be horizontally moved under the pulling of the rotating knob 410. The external threads of the worm segment 403 drive the thin gear 104 to rotate, and the angle of the pointer 102 can be quickly adjusted.

[0055] Push the knob 410, the reciprocating piston 413 moves to the side, the one-way valve 409A1, A4 is closed, A2, A3 is open, the right chamber exhausts, the left chamber sucks the air bag, the air bag spring 406 contracts, the limiting support block 405 is separated from the limiting ring segment 404, the sliding shaft 402 can move horizontally under the pull of the knob 410, the outer thread of the worm segment 403 drives the thin gear 104 to rotate, and the angle of the pointer 102 can be quickly adjusted.

[0056] For the convenience of description, the left and right in the above description do not represent the limitation of the direction in actual application.

[0057] Compared with the ordinary worm and gear meshing mode, the thin gear 104 contacts with the outer thread of the worm less, and when the worm moves horizontally, the meshing mode between the thin gear 104 and the outer thread of the worm can be regarded as the meshing relationship between the rack and the gear, so as to drive the thin gear 104 to rotate when the sliding shaft 402 moves horizontally.

[0058] Through the above mode, the angle position of the pointer can be quickly adjusted, when the angle position is adjusted to a similar angle position, the knob 410 is released, the air bag spring 406 expands under the elastic force of the spring itself, the limiting support block 405 is sleeved in the limiting ring groove to fix the position of the worm, at this time, the knob can be rotated, the sliding shaft 402 is rotated by the limiting groove block between the reciprocating piston 413 and the piston cylinder 408, and then the thin gear 104 is rotated by the outer thread rotation of the worm segment 403, so as to accurately adjust the angle position of the pointer 102.

[0059] The air bag of the air bag spring 406 is made by sewing or other non-fully sealed mode, so that the suction force of the corresponding chamber of the piston cylinder 408 is greater than the air leakage speed of the air bag at the moment of pushing and pulling the piston, so that the air bag shrinks under the action of the air pressure difference. When the knob 410 stops pushing and pulling, the air bag will naturally recover and expand due to air leakage.

[0060] Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the present application.

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 provided 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 blades (201), the ends of the plurality of blades (201) are hinged, and shaft holes are respectively provided 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. A tail plate (204) is installed on the shaft hole at the end, and a suction cup (5) is provided on the tail plate (204) for adsorption and fixation on the surface of an object; a fixing assembly (3) is installed below the protractor (1), and the fixing assembly (3) includes a slot plate (301), a groove is provided in the middle of the slot plate (301), and the straight edge of the protractor (1) can be clamped in the groove of the slot plate (301), and a suction cup (5) is fixed on the side of the slot plate (301), and is fixed to the surface of the object to be measured through the suction cup (5); The ends of the blade (201) are semicircular, a flat hole (203) is provided in the middle of the blade (201), the ends of the flat hole (203) are semicircular, the semicircular ends of the flat hole (203) and the semicircular ends of the blade (201) are concentric, and the ends of the multiple blades (201) are connected, so that the flat holes (203) on adjacent blades (201) overlap, and a lock buckle (202) is inserted into the overlapping flat holes (203), and the lock buckle (202) is a screw and a nut that are rotatably set, and the screw can slide along the flat hole (203), and the adjacent blades (201) are moved or fixed by loosening or tightening the nut; A group of fixed blocks (302) are fixed in the groove of the groove plate (301), a guide rod (303) is installed between the fixed blocks (302), a group of sliders (305) are symmetrically mounted on the guide rods (303), springs are installed between the sliders (305), an insertion rod (306) and a shifting rod (307) are provided on the sliders (305), a strip hole is provided on the groove wall of the groove plate (301), and the shifting rods (307) on the two sliders (305) pass through the strip hole and protrude outside the groove plate (301); A notch (106) is provided at a position between the linear side edges of the protractor (1) and the corresponding slider (305), and a corresponding insertion hole (107) is provided on a side wall corresponding to the notch (106) in a 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 installing the slot plate (301) on the protractor (1); The multifunctional detection ruler further comprises an angle adjustment component (4), the angle adjustment component (4) comprising a housing (401), a sliding shaft (402) being inserted transversely into the housing (401), and a worm section (403) and a limiting ring section (404) being provided on the sliding shaft (402); A shaft sleeve (105) is mounted on the central shaft (103) of the protractor (1), a pointer (102) is extended and fixed on the shaft sleeve (105), and a thin gear (104) is concentrically 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 installed in the piston cylinder (408). The reciprocating piston (413) separates the piston cylinder (408) into two chambers. 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), thereby controlling the air intake through the air inlet (411) and the air outlet (412). A guide groove is provided on the inner wall of the piston cylinder (408), and 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) moves back and forth 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 to 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), thereby connecting the piston cylinder (408) and the airbag spring (406).

2. 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 installed 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).

3. The multifunctional detection ruler according to claim 1, characterized in that: 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, 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).

4. The multifunctional detection ruler according to claim 1, 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 set 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 larger contact surface with the annular groove, thereby ensuring the reliability of support and limiting.

5. The multifunctional detection ruler according to claim 1, characterized in that: The airbag spring (406) is composed of a compression spring wrapped in an airbag.

6. The multifunctional detection ruler according to claim 1, characterized in that: Anti-slip grooves are provided on the outer surface of the knob (410).

7. The multifunctional detection ruler according to claim 1, characterized in that: The airbag of the airbag spring (406) is made by sewing or other non-completely sealed methods.

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