Measuring scale for engineering surveying and mapping

Abstract

The invention relates to the technical field of engineering surveying and mapping, and discloses a measuring scale for engineering surveying and mapping, which comprises a reinforcing plate, and a measuring part is arranged on the surface of the reinforcing plate; the measuring part comprises a measuring ruler, the end of the measuring ruler is fixedly connected with the surface of a reinforcing plate, a groove is formed in the top of the reinforcing plate, a limiting groove is formed in the inner wall of the groove, an inserting hole is formed in the end of the reinforcing plate, a positioning rod is fixedly connected to the top of the reinforcing plate, and rectangular grooves are formed in the bottoms of the reinforcing plate and the measuring ruler. The inner wall of the rectangular groove is fixedly connected with a rubber pad. An operator uses the measuring ruler to measure the size during engineering surveying and mapping, the reinforcing plate is arranged on the surface of the measuring ruler, the strength of the measuring ruler is improved through the reinforcing plate, the situation that the measuring ruler is broken during use is avoided, the rubber pad is arranged at the bottom of the measuring ruler, the friction force of the measuring ruler is improved through the rubber pad, and the measuring ruler is more stable. The friction force of the measuring scale is improved, so that the measuring scale is more stable in use.

Description

Technical Field

[0001] The invention relates to the technical field of engineering surveying and mapping, in particular 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 appurtenances using various surveying techniques and equipment. It mainly includes topographic surveying, building surveying, road surveying, etc. Through these surveys, engineers can obtain geographic information and formulate reasonable design plans. Engineering surveying and mapping is an indispensable part of engineering construction and runs through all stages of engineering construction, including surveying, design, construction, installation, completion, monitoring and operation management; At present, the functions of the measuring rulers used in engineering surveying and mapping are relatively simple. The existing measuring rulers are often used to measure single data. In the process of engineering surveying and mapping, operators are required to carry multiple measuring tools, which affects the operators' surveying and mapping of the project. Summary of the invention

[0003] The object of the present invention is to provide a measuring ruler for engineering surveying and mapping to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a measuring ruler for engineering surveying and mapping, comprising a reinforcement plate, and a measuring component is arranged on the surface of the reinforcement plate; The measuring component includes a measuring ruler, an end of the measuring ruler is fixedly connected to the surface of a reinforcement plate, a groove is provided on the top of the reinforcement plate, a limiting groove is provided on the inner wall of the groove, a socket is provided on the end of the reinforcement plate, a positioning rod is fixedly connected to the top of the reinforcement plate, a rectangular groove is provided on 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 provided on the bottom of the reinforcement plate and the measuring ruler, a limiting hole is provided on the top of the circular groove, an auxiliary component is provided inside the groove, and a fixing component is provided inside the circular groove.

[0005] Furthermore, there are two limit grooves, which are symmetrically arranged with the groove as the center, and there are two insertion holes, which are symmetrically arranged with the reinforcement plate as the center.

[0006] Furthermore, the bottom of the reinforcement plate and the bottom of the measuring ruler are arranged horizontally, the number of the rubber pads is two, the two rubber pads are symmetrically arranged with the circular groove as the center, and the bottom of the rubber pad extends to the bottom outer end of the rectangular groove.

[0007] Further, the auxiliary component includes a center plate, the bottom of the center plate is fixedly connected to the bottom of the inner wall of the groove, the surface of the center plate is slidably connected to a moving frame, the surface of the moving frame is fixedly connected to a stabilizing block, the surface of the stabilizing block is fixedly connected to a connecting rod, the end of the connecting rod away from the stabilizing block is fixedly connected to an elastic rod, the bottom of the elastic rod is plugged with a sliding plate, the surface of the sliding plate is fixedly connected to an extension plate, an extension ruler is provided inside the groove, a deep groove is provided at the top of the extension ruler, a contact groove is provided on the inner wall of the deep groove, an insert plate is fixedly connected to the top of the extension ruler, a rectangular frame is fixedly connected to the surface of the insert plate, a jack plate is fixedly connected to the surface of the rectangular frame, and a sliding hole is provided on the surface of the reinforcement plate.

[0008] Furthermore, the surface of the stabilizing block is slidably connected to the inner wall of the limiting groove, the bottom of the movable frame is in contact with the bottom of the inner wall of the groove, and the sliding hole is connected to the limiting groove.

[0009] Furthermore, one end of the connecting rod away from the stabilizing block extends to the top of the reinforcing plate through a sliding hole, the surface of the sliding plate is slidably connected to the inner wall of the deep groove, and there are two extension plates, which are symmetrically arranged with the sliding plate as the center.

[0010] Furthermore, one end of the two extension plates away from the sliding plate is slidably connected to the inner wall of the contact groove, the inner wall of the socket plate contacts the surface of the positioning rod, the upper surface of the plug plate is adapted to the inner wall of the socket, the bottom of the extension ruler contacts the top of the movable frame, and the surface of the extension ruler contacts the inner wall of the groove.

[0011] Furthermore, the fixing component includes a positioning hole, the positioning hole is opened inside the measuring ruler, the inner wall of the positioning hole is fixedly connected with an elastic rod, the end of the elastic rod away from the positioning hole is fixedly connected with an extrusion plate, the end of the extrusion plate away from the elastic rod is fixedly connected with a triangular plate, the bottom of the extrusion plate is fixedly connected with a synchronous frame, the bottom of the synchronous frame is fixedly connected with a clamping plate, and a semicircular measuring ruler is arranged inside the circular groove.

[0012] Furthermore, the bottom of the positioning hole is connected to the top of the limiting hole, the bottom of the synchronous frame extends to the inside of the circular groove through the limiting hole, the positioning hole and the limiting groove are connected to each other, one end of the triangular plate away from the extrusion plate contacts the surface of the stabilizing block, and the top of the clamping plate contacts the bottom of the semicircular measuring ruler.

[0013] The present invention has the following beneficial effects: The operator of the present invention uses a measuring ruler to measure the size during engineering surveying and mapping. A reinforcement plate is arranged on the surface of the measuring ruler, and the strength of the measuring ruler is improved by the reinforcement plate to avoid the measuring ruler from breaking during use. A rubber pad is arranged at the bottom of the measuring ruler, and the friction of the measuring ruler is improved by the rubber pad. Improving the friction of the measuring ruler can make it more stable during use, and avoid the measuring ruler from sliding during use.

[0014] When the height needs to be adjusted during surveying and mapping, the extension ruler is pulled upward and the elastic rod is squeezed to contract. When the extension ruler is separated from the inner wall of the groove, the extension ruler is pushed to move. When the extension ruler moves, the connection between the linkage rod and the stabilizing block pushes the moving frame to slide on the surface of the center plate. When the moving frame moves to the inner wall end of the groove, the extension ruler is twisted to rotate so that the extension ruler rotates to a vertical state with a ninety-degree angle with the measuring ruler, and the extension ruler is pushed to move downward. When the plug plate corresponds to the inner wall of the socket, the plug plate is pushed to be inserted into the inside of the socket to limit and fix the extension ruler. At this time, the height can be adjusted by the extension ruler, and the extension ruler is fixed by the plug plate. Inside the jack, the extension ruler can move synchronously with the measuring ruler, so that the operator can adjust the height at any time through the extension ruler. At the same time, the extension ruler and the measuring ruler cooperate with each other to measure the right angle. After pulling the extension ruler apart from the elastic rod, the ends of the extension ruler and the measuring ruler are brought into contact with each other to increase the measuring length of the measuring ruler and avoid the situation where the measuring ruler is insufficient in length. After the extension ruler is placed in the groove, the inner wall of the jack plate will contact the surface of the positioning rod to avoid the extension ruler from falling off when carrying. At the same time, the elastic rod pushes the extension ruler to squeeze the mobile frame through elasticity, further improving the stability of the extension ruler when carrying.

[0015] When the angle needs to be measured in the surveying and mapping of the present invention, the moving frame will drive the stabilizing block to slide inside the limiting groove when it moves. At this time, the stabilizing block will be separated from the surface of the triangle plate, and the elastic rod will use its elasticity to push the extrusion plate to contact the inner wall of the positioning hole. At this time, the triangle plate will move to the inside of the limiting groove. When the extrusion plate moves, the separation of the clamping plate and the semicircular measuring ruler is pulled by the synchronous frame. At this time, the semicircular measuring ruler can be taken out from the inside of the circular groove for use, so as to adjust the angle in the surveying and mapping. The semicircular measuring ruler is installed inside the circular groove for convenience in carrying together with the measuring ruler.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the bottom structure of the reinforcement plate of the present invention; Figure 3 It is a schematic diagram of the overall structure of the measuring component of the present invention; Figure 4 Another structural schematic diagram of the measuring component of the present invention; Figure 5 It is a schematic diagram of the overall structure of the auxiliary component of the present invention; Figure 6 Another structural schematic diagram of the auxiliary component of the present invention; Figure 7 It is a schematic diagram of the overall structure of the fixing component of the present invention; Figure 8 It is another structural schematic diagram of the fixing component of the present invention; Fig. 9 It is a schematic diagram of the matching structure of the measuring ruler and the extension ruler of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows: In the figure: 1, reinforcement plate; 2, measuring component; 3, auxiliary component; 4, fixed component; 10, measuring ruler; 11, socket; 12, limit groove; 13, groove; 14, positioning rod; 15, rubber pad; 16, round groove; 17, limit hole; 18, rectangular groove; 20, extension ruler; 21, deep groove; 22, contact groove; 23, rectangular frame; 24, socket plate; 25, plug plate; 26, sliding hole; 27, elastic rod; 28, extension plate; 29, stabilizing block; 30, moving frame; 31, sliding plate; 32, connecting rod; 33, center plate; 40, positioning hole; 41, semicircular measuring ruler; 42, elastic rod; 43, triangle plate; 44, extrusion plate; 45, clamping plate; 46, synchronous frame. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 9 As shown, the present invention is a measuring ruler for engineering surveying and mapping, comprising a reinforcement plate 1, and a measuring component 2 is arranged on the surface of the reinforcement plate 1; The measuring component 2 includes a measuring ruler 10, the end of the measuring ruler 10 is fixedly connected to the surface of the reinforcing plate 1, a groove 13 is provided on the top of the reinforcing plate 1, a limiting groove 12 is provided on the inner wall of the groove 13, a plug hole 11 is provided on the end of the reinforcing plate 1, a positioning rod 14 is fixedly connected to the top of the reinforcing plate 1, and a rectangular groove 18 is provided on the bottom of the reinforcing plate 1 and the measuring ruler 10. The operator of the present invention uses the measuring ruler 10 to measure the size during engineering surveying and mapping. The reinforcing plate 1 is provided on the surface of the measuring ruler 10, and the strength of the measuring ruler 10 is improved by the reinforcing plate 1 to avoid In case the measuring ruler 10 breaks during use, a rubber pad 15 is provided at the bottom of the measuring ruler 10 to improve the friction of the measuring ruler 10. Improving the friction of the measuring ruler 10 can make it more stable during use and prevent the measuring ruler 10 from sliding during use. The inner wall of the rectangular groove 18 is fixedly connected with the rubber pad 15, and a circular groove 16 is provided at the bottom of the reinforcing plate 1 and the measuring ruler 10. A limiting hole 17 is provided at the top of the circular groove 16, an auxiliary component 3 is provided inside the groove 13, and a fixing component 4 is provided inside the circular groove 16.

[0022] There are two limit grooves 12 symmetrically arranged around the groove 13 , and there are two insertion holes 11 symmetrically arranged around the reinforcing plate 1 .

[0023] The bottom of the reinforcing plate 1 and the bottom of the measuring ruler 10 are arranged horizontally. There are two rubber pads 15 , which are symmetrically arranged with the circular groove 16 as the center. The bottom of the rubber pad 15 extends to the bottom outer end of the rectangular groove 18 .

[0024] The auxiliary component 3 includes a center plate 33, the bottom of the center plate 33 is fixedly connected to the bottom of the inner wall of the groove 13, the surface of the center plate 33 is slidably connected to the mobile frame 30, the surface of the mobile frame 30 is fixedly connected to the stabilizing block 29, the surface of the stabilizing block 29 is fixedly connected to the linkage rod 32, and the end of the linkage rod 32 away from the stabilizing block 29 is fixedly connected to the elastic rod 27. When the height needs to be adjusted in surveying and mapping, the extension ruler 20 is pulled upward and the elastic rod 27 is squeezed to contract. When the extension ruler 20 is separated from the inner wall of the groove 13, the extension ruler 20 is pushed to move, and the bottom of the elastic rod 27 is plugged with a sliding plate 31, and the surface of the sliding plate 31 is fixedly connected to the extension plate 28. The groove 1 3 is provided with an extension ruler 20, a deep groove 21 is provided at the top of the extension ruler 20, and a contact groove 22 is provided 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 pushes the moving frame 30 to slide on the surface of the center plate 33. The top of the extension ruler 20 is fixedly connected with a plug plate 25, the surface of the plug plate 25 is fixedly connected with a rectangular frame 23, and the surface of the rectangular frame 23 is fixedly connected with a jack plate 24. When the moving frame 30 moves to the inner wall end of the groove 13, the extension ruler 20 is twisted to rotate, so that the extension ruler 20 rotates to a vertical state and presents a ninety-degree angle with the measuring ruler 10, and the extension ruler 20 is pushed to move downward. The surface of the reinforcement plate 1 is provided with a sliding hole 26.

[0025] 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 socket 11, the plug plate 25 is pushed into the inside of the socket 11 to limit and fix the extension ruler 20. At this time, the height can be adjusted by the extension ruler 20, and the extension ruler 20 is fixed inside the socket 11 through the plug plate 25. The bottom of the movable frame 30 contacts the bottom of the inner wall of the groove 13, and the sliding hole 26 is connected to the limiting groove 12.

[0026] 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, 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 the right angle. After the extension ruler 20 is pulled apart from the elastic rod 27, the surface of the sliding plate 31 is slidably connected to the inner wall of the deep groove 21. There are two extension plates 28, and the two extension plates 28 are symmetrically arranged with the sliding plate 31 as the center.

[0027] 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, and the inner wall of the jack plate 24 contacts the surface of the positioning rod 14, so that the extension ruler 20 and the end of the measuring ruler 10 contact each other, increase the measuring length of the measuring ruler 10, and avoid the situation that the measuring ruler 10 is insufficient in length. After the extension ruler 20 is placed in the interior of the groove 13, the inner wall of the jack plate 24 will contact the surface of the positioning rod 14 to avoid the extension ruler 20 from falling off when 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 mobile frame 30, and the surface of the extension ruler 20 contacts the inner wall of the groove 13.

[0028] The fixing component 4 includes a positioning hole 40, which is provided inside the measuring ruler 10. An elastic rod 42 is fixedly connected to the inner wall of the positioning hole 40. When angle measurement is required in the surveying and mapping of the present invention, the movable frame 30 will drive the stabilizing block 29 to slide inside the limiting groove 12 when moving. At this time, the stabilizing block 29 will separate from the surface of the triangular plate 43. An end of the elastic rod 42 away from the positioning hole 40 is fixedly connected to an extrusion plate 44. An end of the extrusion plate 44 away from the elastic rod 42 is fixedly connected to a triangular plate 43. The elastic rod 42 utilizes elasticity to push the extrusion plate 44 to contact the inner wall of the positioning hole 40. At this time, the triangular plate 43 will move to the inside of the limiting groove 12. A synchronous frame 46 is fixedly connected to the bottom of the extrusion plate 44. A clamping plate 45 is fixedly connected to the bottom of the synchronous frame 46. A semicircular measuring ruler 41 is arranged inside the circular groove 16.

[0029] The bottom of the positioning hole 40 is connected to the top of the limiting hole 17, and the bottom of the synchronous frame 46 extends to the inside of the circular groove 16 through the limiting hole 17. When the extrusion plate 44 moves, the clamping plate 45 is pulled apart from the semicircular measuring ruler 41 through the synchronous frame 46. At this time, the semicircular measuring ruler 41 can be taken out from the inside of the circular groove 16 for use, so as to adjust the angle in surveying and mapping. The positioning hole 40 is connected to the limiting groove 12, and one end of the triangle 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.

[0030] During use, the operator uses the measuring ruler 10 to measure the size during engineering surveying. A reinforcing plate 1 is provided on the surface of the measuring ruler 10 to improve 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 improve the friction of the measuring ruler 10. Improving 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. When the extension ruler 20 is separated from the inner wall of the groove 13, the extension ruler 20 is pushed to extend. The extension ruler 20 moves, and the extension ruler 20 pushes the moving frame 30 to slide on the surface of the center plate 33 through the connection between the connecting rod 32 and the stabilizing block 29 during movement. When the moving frame 30 moves to the inner wall end of the groove 13, the extension ruler 20 is twisted to rotate, so that the extension ruler 20 rotates to a vertical state and presents a ninety-degree angle with the measuring ruler 10, and the extension ruler 20 is pushed to move downward. When the plug plate 25 corresponds to the inner wall of the socket 11, the plug plate 25 is pushed to be inserted into the inside of the socket 11 to limit and fix the extension ruler 20. At this time, the height can be adjusted by the extension ruler 20, and the extension ruler 20 is fixed inside the socket 11 through the plug plate 25, so that the extension ruler 20 can be synchronized with the measuring ruler 10. The extension ruler 20 is moved step by step, so that the operator can adjust the height at any time through the extension ruler 20. At the same time, the extension ruler 20 and the measuring ruler 10 cooperate with each other to measure the right angle. After pulling the extension ruler 20 and separating it from the elastic rod 27, the ends of the extension ruler 20 and the measuring ruler 10 are brought into contact with each other to increase the measuring length of the measuring ruler 10 and avoid the situation that the measuring ruler 10 is insufficient in length. After the extension ruler 20 is placed in the groove 13, the inner wall of the jack plate 24 will contact the surface of the positioning rod 14 to avoid the extension ruler 20 from falling off when carrying. At the same time, the elastic rod 27 pushes the extension ruler 20 to squeeze the mobile frame 30 through elasticity, further improving the extension ruler 20 in carrying. When the angle needs to be measured during surveying and mapping, the mobile frame 30 will drive the stabilizing block 29 to slide inside the limiting groove 12 during movement. At this time, the stabilizing block 29 will separate from the surface of the triangle plate 43, and the elastic rod 42 will use its elasticity to push the extrusion plate 44 to contact the inner wall of the positioning hole 40. At this time, the triangle plate 43 will move to the inside of the limiting groove 12. When the extrusion plate 44 moves, the separation of the card plate 45 and the semicircular measuring ruler 41 will be pulled by the synchronous frame 46. At this time, the semicircular measuring ruler 41 can be taken out from the inside of the circular groove 16 for use, so as to adjust the angle during surveying and mapping. The semicircular measuring ruler 41 is installed inside the circular groove 16 for easy carrying together with the measuring ruler 10.

[0031] 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 implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only 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).

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 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).

5. The measuring ruler for engineering surveying and mapping according to claim 4, 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).

6. The measuring ruler for engineering surveying and mapping according to claim 5, 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.

7. The measuring ruler for engineering surveying and mapping according to claim 6, 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).

8. The measuring ruler for engineering surveying and mapping according to claim 7, 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).

9. The measuring ruler for engineering surveying and mapping according to claim 8, 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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