A measuring ruler for engineering surveying

Abstract

The present invention relates to the technical field of engineering surveying and mapping, and discloses a measuring ruler for engineering surveying and mapping, which includes a reinforcement plate, and a measuring component is arranged on the surface of the reinforcement plate; the measuring component includes a measuring ruler, the end of the measuring ruler is fixedly connected to the surface of the reinforcement plate, a groove is opened at the top of the reinforcement plate, a limiting groove is opened on the inner wall of the groove, a jack is opened at the end of the reinforcement plate, a positioning rod is fixedly connected to the top of the reinforcement plate, and rectangular grooves are opened at the bottom of the reinforcement plate and the measuring ruler, and a rubber pad is fixedly connected to the inner wall of the rectangular groove. In the present invention, an operator uses the measuring ruler to measure dimensions during engineering surveying and mapping. A reinforcement plate is arranged on the surface of the measuring ruler to improve the strength of the measuring ruler through the reinforcement plate, avoiding the situation of the measuring ruler breaking during use. A rubber pad is arranged at the bottom of the measuring ruler to improve the friction of the measuring ruler through the rubber pad. Improving the friction of the measuring ruler can make it more stable during use.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering surveying and mapping, and particularly to a measuring ruler for engineering surveying and mapping. Background Art

[0002] Engineering surveying and mapping refers to the process of quantitatively and qualitatively describing the ground and its appendages using various surveying techniques and equipment. It mainly includes topographic surveying, building surveying, road surveying, etc. Through these surveys, engineers can obtain geographical information and formulate reasonable design plans. Engineering surveying and mapping is an essential part of engineering construction, running through all stages of engineering construction, including surveying, design, construction, installation, completion, monitoring, and operation management;

[0003] Currently, the functions of the measuring rulers used in engineering surveying and mapping are relatively single. Existing measuring rulers are often used to measure single data, and during the process of engineering surveying and mapping, operators need to carry multiple measuring tools, which affects the surveying and mapping of the project by the operators. Summary of the Invention

[0004] The purpose of the present invention is to provide a measuring ruler for engineering surveying and mapping to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] The present invention is a measuring ruler for engineering surveying and mapping, including a reinforcement plate, and a measuring component is arranged on the surface of the reinforcement plate;

[0007] The measuring component includes a measuring ruler, the end of the measuring ruler is fixedly connected to the surface of the reinforcement plate, a groove is opened at the top of the reinforcement plate, a limiting groove is opened on the inner wall of the groove, an insertion hole is opened at the end of the reinforcement plate, a positioning rod is fixedly connected to the top of the reinforcement plate, a rectangular groove is opened at the bottom of the reinforcement plate and the measuring ruler, a rubber pad is fixedly connected to the inner wall of the rectangular groove, a circular groove is opened at the bottom of the reinforcement plate and the measuring ruler, a limiting hole is opened at the top of the circular groove, an auxiliary component is arranged inside the groove, and a fixing component is arranged inside the circular groove.

[0008] Furthermore, the number of the limiting grooves is set to two, and the two limiting grooves are symmetrically arranged with the groove as the center. The number of the insertion holes is set to two, and the two insertion holes are symmetrically arranged with the reinforcement plate as the center.

[0009] Furthermore, the bottom of the reinforcement plate and the bottom of the measuring ruler are horizontally arranged. The number of the rubber pads is set to two, and the two rubber pads are symmetrically arranged with the circular groove as the center. The bottom of the rubber pad extends to the outer end of the bottom of the rectangular groove.

[0010] Further, the auxiliary component includes a central plate, the bottom of the central plate is fixedly connected to the bottom of the inner wall of the groove, a moving frame is slidably connected to the surface of the central plate, a stabilizing block is fixedly connected to the surface of the moving frame, a linkage rod is fixedly connected to the surface of the stabilizing block, an elastic rod is fixedly connected to the end of the linkage rod away from the stabilizing block, a sliding plate is inserted at the bottom of the elastic rod, an extension plate is fixedly connected to the surface of the sliding plate, an extension ruler is arranged inside the groove, a deep groove is formed at the top of the extension ruler, a contact groove is formed in the inner wall of the deep groove, a plug board is fixedly connected to the top of the extension ruler, a rectangular frame is fixedly connected to the surface of the plug board, a jack board is fixedly connected to the surface of the rectangular frame, and a sliding hole is formed in the surface of the reinforcing plate.

[0011] Further, the surface of the stabilizing block is slidably connected to the inner wall of the limiting groove, the bottom of the moving frame contacts the bottom of the inner wall of the groove, and the sliding hole communicates with the limiting groove.

[0012] Further, the end of the linkage rod away from the stabilizing block extends above the reinforcing plate through the sliding hole, the surface of the sliding plate is slidably connected to the inner wall of the deep groove, the number of the extension plates is two, and the two extension plates are symmetrically arranged with the sliding plate as the center.

[0013] Further, the ends of the two extension plates away from the sliding plate are slidably connected to the inner wall of the contact groove, the inner wall of the jack board contacts the surface of the positioning rod, the upper surface of the plug board is adapted to the inner wall of the jack, the bottom of the extension ruler contacts the top of the moving frame, and the surface of the extension ruler contacts the inner wall of the groove.

[0014] Further, the fixing component includes a positioning hole, the positioning hole is formed inside the measuring ruler, a elastic rod is fixedly connected to the inner wall of the positioning hole, a pressing plate is fixedly connected to the end of the elastic rod away from the positioning hole, a triangular plate is fixedly connected to the end of the pressing plate away from the elastic rod, a synchronous frame is fixedly connected to the bottom of the pressing plate, a clamping plate is fixedly connected to the bottom of the synchronous frame, and a semi-circular measuring ruler is arranged inside the circular groove.

[0015] Further, the bottom of the positioning hole communicates with the top of the limiting hole, the bottom of the synchronous frame extends into the circular groove through the limiting hole, the positioning hole communicates with the limiting groove, the end of the triangular plate away from the pressing plate contacts the surface of the stabilizing block, and the top of the clamping plate contacts the bottom of the semi-circular measuring ruler.

[0016] The present invention has the following beneficial effects:

[0017] When operating the present invention, during engineering surveying and mapping, the operator uses a measuring ruler to measure dimensions. A reinforcing plate is provided on the surface of the measuring ruler to enhance the strength of the measuring ruler and prevent the measuring ruler from breaking during use. A rubber pad is provided at the bottom of the measuring ruler to increase the friction of the measuring ruler. Increasing the friction of the measuring ruler can make it more stable during use and prevent the measuring ruler from sliding during use.

[0018] When the present invention needs to adjust the height during surveying and mapping, pull the extension ruler upward to move and squeeze the elastic rod to contract. After the extension ruler separates from the inner wall of the groove, push the extension ruler to move. When the extension ruler moves, it drives the moving frame to slide on the surface of the central plate through the connection of the linkage rod and the stabilizing block. When the moving frame moves to the end of the inner wall of the groove, twist the extension ruler to rotate so that the extension ruler rotates to a vertical state and forms a 90-degree angle with the measuring ruler. Then push the extension ruler downward. When the insertion plate corresponds to the inner wall of the insertion hole, push the insertion plate into the insertion hole to limit and fix the extension ruler. At this time, the height can be adjusted through the extension ruler. The extension ruler is fixed in the insertion hole through the insertion plate, enabling the extension ruler to move synchronously with the measuring ruler so that the operator can adjust the height through the extension ruler at any time. At the same time, the extension ruler and the measuring ruler cooperate with each other to measure a right angle. After pulling the extension ruler away from the elastic rod, make the ends of the extension ruler and the measuring ruler contact each other to increase the measuring length of the measuring ruler and prevent the situation of insufficient length of the measuring ruler. After placing the extension ruler into the groove, the inner wall of the insertion hole plate will contact the surface of the positioning rod to prevent the extension ruler from falling off during carrying. At the same time, the elastic rod elastically pushes the extension ruler to squeeze the moving frame, further improving the stability of the extension ruler during carrying.

[0019] When the present invention needs to measure an angle during surveying and mapping, the moving frame will drive the stabilizing block to slide inside the limiting groove during movement. At this time, the stabilizing block will separate from the surface of the triangular plate. The elastic rod uses elasticity to push the pressing plate to contact the inner wall of the positioning hole. At this time, the triangular plate will move into the limiting groove. When the pressing plate moves, it pulls the clamping plate away from the semi-circular measuring ruler through the synchronous frame. At this time, the semi-circular measuring ruler can be taken out from the circular groove for use to adjust the angle during surveying and mapping. Installing the semi-circular measuring ruler inside the circular groove is convenient for carrying it together with the measuring ruler.

[0020] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of the overall structure of the present invention;

[0023] Figure 2 Schematic diagram of the bottom structure of the reinforcement plate of the present invention;

[0024] Figure 3 Schematic diagram of the overall structure of the measuring component of the present invention;

[0025] Figure 4 Another schematic diagram of the measuring component of the present invention;

[0026] Figure 5 Schematic diagram of the overall structure of the auxiliary component of the present invention;

[0027] Figure 6 Another schematic diagram of the auxiliary component of the present invention;

[0028] Figure 7 Schematic diagram of the overall structure of the fixing component of the present invention;

[0029] Figure 8 Another schematic diagram of the fixing component of the present invention;

[0030] Figure 9 Schematic diagram of the matching structure of the measuring ruler and the extension ruler of the present invention.

[0031] In the drawings, the list of components represented by each reference numeral is as follows:

[0032] In the figure: 1, reinforcement plate; 2, measuring component; 3, auxiliary component; 4, fixing component; 10, measuring ruler; 11, jack; 12, limit groove; 13, groove; 14, positioning rod; 15, rubber pad; 16, circular groove; 17, limit hole; 18, rectangular groove; 20, extension ruler; 21, deep groove; 22, contact groove; 23, rectangular frame; 24, jack plate; 25, plug plate; 26, sliding hole; 27, elastic rod; 28, extension plate; 29, stabilizing block; 30, moving frame; 31, sliding plate; 32, linkage rod; 33, central plate; 40, positioning hole; 41, semi-circular measuring ruler; 42, elastic rod; 43, triangular plate; 44, extrusion plate; 45, clamping plate; 46, synchronous frame. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figures 1-9 As shown in the figure, the present invention is a measuring ruler for engineering surveying and mapping, including a reinforcement plate 1, and a measuring component 2 is arranged on the surface of the reinforcement plate 1;

[0035] The measuring component 2 includes a measuring ruler 10, the end of the measuring ruler 10 is fixedly connected to the surface of the reinforcement plate 1, a groove 13 is opened at the top of the reinforcement plate 1, a limiting groove 12 is opened on the inner wall of the groove 13, a jack 11 is opened at the end of the reinforcement plate 1, a positioning rod 14 is fixedly connected to the top of the reinforcement plate 1, and a rectangular groove 18 is opened at the bottom of the reinforcement plate 1 and the measuring ruler 10. In the engineering surveying and mapping of the present invention, the operator uses the measuring ruler 10 to measure the size. A reinforcement plate 1 is arranged on the surface of the measuring ruler 10 to improve the strength of the measuring ruler 10 through the reinforcement plate 1 and avoid the situation of fracture of the measuring ruler 10 during use. A rubber pad 15 is arranged at the bottom of the measuring ruler 10 to improve the friction of the measuring ruler 10 through the rubber pad 15. Improving the friction of the measuring ruler 10 can make it more stable during use and avoid the situation of sliding of the measuring ruler 10 during use. A rubber pad 15 is fixedly connected to the inner wall of the rectangular groove 18, and a circular groove 16 is opened at the bottom of the reinforcement plate 1 and the measuring ruler 10. A limiting hole 17 is opened at the top of the circular groove 16. An auxiliary component 3 is arranged inside the groove 13, and a fixing component 4 is arranged inside the circular groove 16.

[0036] The number of the limiting grooves 12 is set to two, and the two limiting grooves 12 are symmetrically arranged with the groove 13 as the center. The number of the jacks 11 is set to two, and the two jacks 11 are symmetrically arranged with the reinforcement plate 1 as the center.

[0037] The bottom of the reinforcement plate 1 and the bottom of the measuring ruler 10 are horizontally arranged. The number of the rubber pads 15 is set to two, and the two rubber pads 15 are symmetrically arranged with the circular groove 16 as the center. The bottom of the rubber pad 15 extends to the outer end of the bottom of the rectangular groove 18.

[0038] The auxiliary component 3 includes a central plate 33. The bottom of the central plate 33 is fixedly connected to the inner wall bottom of the groove 13. A moving frame 30 is slidably connected to the surface of the central plate 33. A stabilizing block 29 is fixedly connected to the surface of the moving frame 30. A linkage rod 32 is fixedly connected to the surface of the stabilizing block 29. One end of the linkage rod 32 far from the stabilizing block 29 is fixedly connected to an elastic rod 27. When the height needs to be adjusted during surveying and mapping in the present invention, the extension ruler 20 is pulled upward to squeeze the elastic rod 27 to contract. After the extension ruler 20 is separated from the inner wall of the groove 13, the extension ruler 20 is pushed to move. A sliding plate 31 is inserted into the bottom of the elastic rod 27. An extension plate 28 is fixedly connected to the surface of the sliding plate 31. The extension ruler 20 is arranged inside the groove 13. A deep groove 21 is opened at the top of the extension ruler 20. A contact groove 22 is opened on the inner wall of the deep groove 21. When the extension ruler 20 moves, the connection between the linkage rod 32 and the stabilizing block 29 is used to push the moving frame 30 to slide on the surface of the central plate 33. A plug plate 25 is fixedly connected to the top of the extension ruler 20. A rectangular frame 23 is fixedly connected to the surface of the plug plate 25. A jack plate 24 is fixedly connected to the surface of the rectangular frame 23. When the moving frame 30 moves to the end of the inner wall of the groove 13, the extension ruler 20 is twisted to rotate so that the extension ruler 20 rotates to a vertical state and forms a ninety-degree angle with the measuring ruler 10. Then the extension ruler 20 is pushed downward. A sliding hole 26 is opened on the surface of the reinforcing plate 1.

[0039] The surface of the stabilizing block 29 is slidably connected to the inner wall of the limiting groove 12. When the plug plate 25 corresponds to the inner wall of the jack 11, the plug plate 25 is pushed to insert into the jack 11 to limit and fix the extension ruler 20. At this time, the height can be adjusted through the extension ruler 20. The extension ruler 20 is fixed inside the jack 11 through the plug plate 25. The bottom of the moving frame 30 contacts the inner wall bottom of the groove 13. The sliding hole 26 communicates with the limiting groove 12.

[0040] One end of the linkage rod 32 far from the stabilizing block 29 extends above the reinforcing plate 1 through the sliding hole 26, so that the extension ruler 20 can move synchronously with the measuring ruler 10, so that the operator can adjust the height through the extension ruler 20 at any time. At the same time, the extension ruler 20 and the measuring ruler 10 cooperate with each other to measure a right angle. After the extension ruler 20 is pulled away from the elastic rod 27, the surface of the sliding plate 31 is slidably connected to the inner wall of the deep groove 21. The number of the extension plates 28 is two, and the two extension plates 28 are symmetrically arranged with the sliding plate 31 as the center.

[0041] One end of the two extension plates 28 away from the sliding plate 31 is slidably connected to the inner wall of the contact groove 22. The inner wall of the jack plate 24 contacts the surface of the positioning rod 14. The end of the extension ruler 20 is in contact with the end of the measuring ruler 10, increasing the measuring length of the measuring ruler 10 and avoiding the situation of insufficient length of the measuring ruler 10. After the extension ruler 20 is placed into the groove 13, the inner wall of the jack plate 24 will contact the surface of the positioning rod 14, avoiding the situation of the extension ruler 20 falling off during carrying. The upper surface of the plug plate 25 is adapted to the inner wall of the jack 11. The bottom of the extension ruler 20 contacts the top of the moving frame 30, and the surface of the extension ruler 20 contacts the inner wall of the groove 13.

[0042] The fixing member 4 includes a positioning hole 40 opened in the measuring ruler 10. An elastic rod 42 is fixedly connected to the inner wall of the positioning hole 40. When the angle needs to be measured in the surveying and mapping of the present invention, the moving frame 30 will drive the stable block 29 to slide inside the limiting groove 12 during movement. At this time, the stable block 29 will be separated from the surface of the triangular plate 43. One end of the elastic rod 42 away from the positioning hole 40 is fixedly connected to a pressing plate 44. One end of the pressing plate 44 away from the elastic rod 42 is fixedly connected to a triangular plate 43. The elastic rod 42 uses elasticity to push the pressing plate 44 to contact the inner wall of the positioning hole 40. At this time, the triangular plate 43 will move into the limiting groove 12. A synchronous frame 46 is fixedly connected to the bottom of the pressing plate 44, and a clamping plate 45 is fixedly connected to the bottom of the synchronous frame 46. A semi-circular measuring ruler 41 is arranged inside the circular groove 16.

[0043] The bottom of the positioning hole 40 communicates with the top of the limiting hole 17. The bottom of the synchronous frame 46 extends into the circular groove 16 through the limiting hole 17. When the pressing plate 44 moves, it pulls the clamping plate 45 to separate from the semi-circular measuring ruler 41 through the synchronous frame 46. At this time, the semi-circular measuring ruler 41 can be taken out from the circular groove 16 for use, so as to adjust the angle in the surveying and mapping. The positioning hole 40 communicates with the limiting groove 12. One end of the triangular plate 43 away from the pressing plate 44 contacts the surface of the stable block 29. The top of the clamping plate 45 contacts the bottom of the semi-circular measuring ruler 41.

[0044] During use, the operator uses the measuring ruler 10 to measure dimensions during engineering surveying. A reinforcing plate 1 is provided on the surface of the measuring ruler 10 to enhance the strength of the measuring ruler 10 and prevent the measuring ruler 10 from breaking during use. A rubber pad 15 is provided at the bottom of the measuring ruler 10 to increase the friction of the measuring ruler 10. Increasing the friction of the measuring ruler 10 can make it more stable during use and prevent the measuring ruler 10 from sliding during use. When the height needs to be adjusted during surveying, the extension ruler 20 is pulled upward and the elastic rod 27 is squeezed to contract. After the extension ruler 20 is separated from the inner wall of the groove 13, the extension ruler 20 is pushed to move. When the extension ruler 20 moves, the connection between the connecting rod 32 and the stabilizing block 29 pushes the moving frame 30 to slide on the surface of the central plate 33. When the moving frame 30 moves to the end of the inner wall of the groove 13, the extension ruler 20 is twisted to rotate, so that the extension ruler 20 rotates to a vertical state and forms a 90-degree angle with the measuring ruler 10. The extension ruler 20 is pushed downward. When the insertion plate 25 corresponds to the inner wall of the insertion hole 11, the insertion plate 25 is pushed into the insertion hole 11 to limit and fix the extension ruler 20. At this time, the height can be adjusted through the extension ruler 20. The extension ruler 20 is fixed in the insertion hole 11 through the insertion plate 25, so that the extension ruler 20 can move synchronously with the measuring ruler 10, so that the operator can adjust the height through the extension ruler 20 at any time. At the same time, the extension ruler 20 and the measuring ruler 10 cooperate with each other to measure a right angle. After the extension ruler 20 is pulled away from the elastic rod 27, the end of the extension ruler 20 is brought into contact with the end of the measuring ruler 10 to increase the measuring length of the measuring ruler 10 and prevent the situation of insufficient length of the measuring ruler 10. After the extension ruler 20 is placed into the groove 13, the inner wall of the socket plate 24 will contact the surface of the positioning rod 14 to prevent the extension ruler 20 from falling off during carrying. At the same time, the elastic rod 27 elastically pushes the extension ruler 20 to squeeze the moving frame 30, further improving the stability of the extension ruler 20 during carrying. When the angle needs to be measured during surveying, the moving frame 30 will drive the stabilizing block 29 to slide inside the limiting groove 12 when it moves. At this time, the stabilizing block 29 will be separated from the surface of the triangular plate 43. The elastic rod 42 uses elasticity to push the pressing plate 44 to contact the inner wall of the positioning hole 40. At this time, the triangular plate 43 will move into the limiting groove 12. When the pressing plate 44 moves, it pulls the clamping plate 45 to separate from the semi-circular measuring ruler 41 through the synchronous frame 46. At this time, the semi-circular measuring ruler 41 can be taken out from the circular groove 16 for use, so as to adjust the angle during surveying. Installing the semi-circular measuring ruler 41 in the circular groove 16 is convenient for carrying it together with the measuring ruler 10.

[0045] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A measuring ruler for engineering surveying and mapping, comprising a reinforcement plate (1), characterized in that: A measuring component (2) is provided on the surface of the reinforcement plate (1); The measuring component (2) comprises a measuring ruler (10), the end of the measuring ruler (10) is fixedly connected to the surface of the reinforcing plate (1), the top of the reinforcing plate (1) is provided with a groove (13), the inner wall of the groove (13) is provided with a limiting groove (12), the end of the reinforcing plate (1) is provided with a plug hole (11), the top of the reinforcing plate (1) is fixedly connected with a positioning rod (14), the bottom of the reinforcing plate (1) and the measuring ruler (10) are provided with a rectangular groove (18), the inner wall of the rectangular groove (18) is fixedly connected with a rubber pad (15), the bottom of the reinforcing plate (1) and the measuring ruler (10) are provided with a circular groove (16), the top of the circular groove (16) is provided with a limiting hole (17), the inside of the groove (13) is provided with an auxiliary component (3), and the inside of the circular groove (16) is provided with a fixing component (4); The auxiliary component (3) comprises a central plate (33), the bottom of the central plate (33) being fixedly connected to the bottom of the inner wall of the groove (13), the surface of the central plate (33) being slidably connected to a moving frame (30), the surface of the moving frame (30) being fixedly connected to a stabilizing block (29), the surface of the stabilizing block (29) being fixedly connected to a connecting rod (32), one end of the connecting rod (32) away from the stabilizing block (29) being fixedly connected to an elastic rod (27), the bottom of the elastic rod (27) being plugged with a sliding plate (31), An extension plate (28) is fixedly connected to the surface of the sliding plate (31); an extension ruler (20) is arranged inside the groove (13); a deep groove (21) is provided on the top of the extension ruler (20); a contact groove (22) is provided on the inner wall of the deep groove (21); an insert plate (25) is fixedly connected to the top of the extension ruler (20); a rectangular frame (23) is fixedly connected to the surface of the insert plate (25); a socket plate (24) is fixedly connected to the surface of the rectangular frame (23); and a sliding hole (26) is provided on the surface of the reinforcement plate (1).

2. The measuring ruler for engineering surveying and mapping according to claim 1, characterized in that: The number of the limiting grooves (12) is two, and the two limiting grooves (12) are symmetrically arranged with the groove (13) as the center; the number of the plug holes (11) is two, and the two plug holes (11) are symmetrically arranged with the reinforcing plate (1) as the center.

3. The measuring ruler for engineering surveying and mapping according to claim 2, characterized in that: The bottom of the reinforcing plate (1) and the bottom of the measuring ruler (10) are arranged horizontally, and the number of the rubber pads (15) is two. The two rubber pads (15) are symmetrically arranged with the circular groove (16) as the center, and the bottom of the rubber pad (15) extends to the bottom outer end of the rectangular groove (18).

4. The measuring ruler for engineering surveying and mapping according to claim 3, characterized in that: The surface of the stabilizing block (29) is slidably connected to the inner wall of the limiting groove (12), the bottom of the movable frame (30) is in contact with the bottom of the inner wall of the groove (13), and the sliding hole (26) is connected to the limiting groove (12).

5. The measuring ruler for engineering surveying and mapping according to claim 4, characterized in that: One end of the linkage rod (32) away from the stabilizing block (29) extends to the top of the reinforcing plate (1) through the sliding hole (26); the surface of the sliding plate (31) is slidably connected to the inner wall of the deep groove (21); and there are two extension plates (28), which are symmetrically arranged with the sliding plate (31) as the center.

6. The measuring ruler for engineering surveying and mapping according to claim 5, characterized in that: One end of the two extension plates (28) away from the sliding plate (31) is slidably connected to the inner wall of the contact groove (22), the inner wall of the socket plate (24) contacts the surface of the positioning rod (14), the upper surface of the plug plate (25) is matched with the inner wall of the socket (11), the bottom of the extension ruler (20) contacts the top of the movable frame (30), and the surface of the extension ruler (20) contacts the inner wall of the groove (13).

7. The measuring ruler for engineering surveying and mapping according to claim 6, characterized in that: The fixing component (4) comprises a positioning hole (40), the positioning hole (40) being formed inside the measuring ruler (10), an elastic rod (42) being fixedly connected to the inner wall of the positioning hole (40), an extrusion plate (44) being fixedly connected to one end of the elastic rod (42) away from the positioning hole (40), a triangular plate (43) being fixedly connected to one end of the extrusion plate (44) away from the elastic rod (42), a synchronous frame (46) being fixedly connected to the bottom of the extrusion plate (44), a clamping plate (45) being fixedly connected to the bottom of the synchronous frame (46), and a semicircular measuring ruler (41) being arranged inside the circular groove (16).

8. The measuring ruler for engineering surveying and mapping according to claim 7, characterized in that: The bottom of the positioning hole (40) is communicated with the top of the limiting hole (17), the bottom of the synchronous frame (46) extends to the inside of the circular groove (16) through the limiting hole (17), the positioning hole (40) is communicated with the limiting groove (12), one end of the triangular plate (43) away from the extrusion plate (44) contacts the surface of the stabilizing block (29), and the top of the clamping plate (45) contacts the bottom of the semicircular measuring ruler (41).

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