Surveying and mapping ruler for geological surveying and mapping

Abstract

The invention relates to the technical field of surveying and mapping rulers, and discloses a surveying and mapping ruler for geological surveying and mapping, which comprises a shell, and a surveying and mapping tape is elastically wound and connected in the shell through a coil spring; the mounting frame is fixed on the outer side of the shell, the top of the mounting frame is provided with a friction speed reduction unit used for reducing the rewinding speed of the surveying and mapping tape, and the two sides of the bottom of the friction speed reduction unit are each provided with a rotary centrifugal unit; the cleaning roller is rotationally mounted on the front side of the top of the mounting frame and used for wiping and cleaning the surface of the surveying and mapping tape, lifting seats are rotationally connected to the two sides of the cleaning roller, separation assemblies are mounted on the lifting seats, and driving units are further mounted on the two sides of the cleaning roller; according to the invention, the friction deceleration unit is utilized to perform upward pressing occlusion on the surveying and mapping tape during winding, so that the resistance of the surveying and mapping tape in the winding process is increased, the stability of measurement work can be improved, the personal safety of a user can be guaranteed to the greatest extent, and various potential safety hazards caused by too fast winding are avoided.

Description

Technical Field

[0001] This invention relates to the field of surveying ruler technology, specifically a surveying ruler for geological surveying. Background Technology

[0002] Geological surveying is a general term for all surveying work involved in geological investigations and mineral exploration, as well as the compilation of resulting maps. During geological surveying, measuring tapes are used to measure the ground. Currently, the most widely used measuring tapes are made primarily of steel. Due to their sturdiness, durability, and resistance to deformation, steel measuring tapes have become the preferred tool in surveying work.

[0003] Existing surveying tape measures, after completing a measurement, utilize a built-in torsion spring to achieve an automatic rewinding mechanism. This automatic rewinding process is highly efficient, with the surveying steel tape rapidly rewinding back into the tape measure housing within a very short time. However, precisely because of this extremely rapid automatic rewinding speed, if the fast-moving surveying steel tape accidentally comes into contact with the user's palm during the rewinding process, the high-speed moving edge of the tape could potentially cause varying degrees of scratches or crush injuries to the user's palm, thus posing a potential threat to the user's personal safety. Summary of the Invention

[0004] The purpose of this invention is to provide a surveying ruler for geological mapping to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a geological surveying ruler, comprising a housing, wherein a surveying ruler is elastically wound and connected within the housing via a coil spring; further comprising: a mounting frame fixed to the outside of the housing, wherein a friction deceleration unit for slowing down the rewinding speed of the surveying ruler is mounted on the top of the mounting frame, and a rotary centrifugal unit is mounted on both sides of the bottom of the friction deceleration unit; a cleaning roller rotatably mounted on the front side of the top of the mounting frame for wiping and cleaning the surface of the surveying ruler, wherein a lifting seat is rotatably connected to both sides of the cleaning roller, a separation component is mounted on the lifting seat, and a drive unit is also mounted on both sides of the cleaning roller.

[0006] Preferably, the friction deceleration unit includes an upper fixed plate, which is fixedly connected to the top of the mounting frame. A lower movable plate is provided below the upper fixed plate. The measuring tape is located between the upper fixed plate and the lower movable plate. Two trapezoidal transmission blocks are symmetrically fixed at the bottom of the lower movable plate. A pulley is slidably connected to the bottom inclined surface of the trapezoidal transmission block. An extension rod is fixed to the bottom of the pulley. The movable end of the rotary centrifugal unit is fixedly connected to the bottom of the extension rod.

[0007] Preferably, the rotary centrifugal unit includes a U-shaped seat fixedly connected to the inner wall of the mounting frame. The U-shaped seat is rotatably connected to a horizontal shaft via bearings. Both ends of the horizontal shaft are fixedly sleeved with connecting discs. Four fixed shells are arranged in an array on the outer side of the connecting discs. An elastic element is installed on one side of the fixed shell. A pulling cylinder is sleeved on the outer side of the horizontal shaft. The bottom end of the extension rod is fixed to the outer wall of the pulling cylinder. A rotating ring is rotatably connected to the outer side of the pulling cylinder via bearings. Four movable rods are evenly hinged to the outer side of the rotating ring. The movable end of the elastic element is rotatably connected to the end of the movable rod away from the rotating ring. The output end of the drive unit is drively connected to the horizontal shaft.

[0008] Preferably, the drive unit includes a first gear fixedly connected to the end of the cleaning roller, a second gear meshing with the bottom of the first gear, a first drive shaft fixedly fixed in the center hole of the second gear, the first drive shaft being rotatably connected to the mounting frame via a bearing seat, a drive pulley fixedly sleeved on the outer side of the first drive shaft, the drive pulley being connected to a driven pulley via a synchronous belt, a second drive shaft fixedly sleeved in the center hole of the driven pulley, the second drive shaft being rotatably connected to the mounting frame via a bearing seat, a third gear fixedly sleeved in the middle of the second drive shaft, a fourth gear meshing with one side of the third gear, and the fourth gear being fixedly sleeved with the horizontal shaft.

[0009] Preferably, four first sleeve rods are fixedly connected to the bottom of the upper fixed plate, the first sleeve rods are slidably sleeved with the lower moving plate, and the bottom end of the first sleeve rods is also fixed with a limit block.

[0010] Preferably, the elastic element includes a sliding plate fixedly connected to the end of the movable rod away from the rotating ring, the sliding plate being slidably connected to the inner wall of the fixed shell, and a second sleeve rod slidably sleeved with the sliding plate being fixed on the inner side of the fixed shell, and a return spring being provided on the outer side of the second sleeve rod between the sliding plate and the inner wall of the fixed shell.

[0011] Preferably, the separation assembly includes a stud threadedly connected to the lifting seat, a limit shaft fixed at the bottom of the stud, the limit shaft being rotatably connected to the outer wall of the mounting frame via a bearing seat, and a handle fixed at the top of the stud.

[0012] Preferably, a first slider is fixed on one side of the lifting seat, and a first groove adapted to the slider is provided on the outer side of the mounting frame.

[0013] Preferably, the diameter of the third gear is larger than the diameter of the fourth gear, and the mounting bracket has a through groove, in which the fourth gear is disposed.

[0014] Preferably, two second sliders are symmetrically fixed on the side of the pull cylinder away from the fixed shell, and a horizontal plate is fixed on the outer side of the U-shaped seat. The horizontal plate is provided with a second sliding groove that matches the second sliders.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes a friction deceleration unit to apply upward pressure and engage the measuring tape during winding, thereby increasing the resistance of the measuring tape during the winding process. This not only improves the stability of the measurement work but also maximizes the protection of the user's personal safety, avoiding various safety hazards caused by excessively fast winding.

[0016] 2. In this invention, the measuring tape drives the cleaning roller to rotate during the winding process, thereby generating relative friction with the surface of the measuring tape. This can clean the dirt adsorbed on the measuring tape, preventing the dirt from contaminating the measuring tape and making it more convenient to wind up the measuring tape. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 for Figure 2 A schematic diagram of the structure from a frontal perspective; Figure 4 This is a front view schematic diagram of the friction deceleration unit of the present invention; Figure 5 This is a schematic diagram of the structure of the rotary centrifuge unit of the present invention; Figure 6 for Figure 5 Enlarged view of region A in the middle; Figure 7 This is a schematic diagram of the structure of the driving unit of the present invention; Figure 8 This is a schematic diagram of the structure of the separation component of the present invention; Figure 9 This is a top view of the detachable component of the present invention; Figure 10 This is a schematic diagram of the structure of the pull cylinder and U-shaped seat of the present invention; Figure 11 This is a schematic diagram of the overall external structure of the present invention.

[0018] In the diagram: 1. Housing; 2. Measuring tape; 3. Mounting bracket; 4. Friction reduction unit; 5. Rotary centrifugal unit; 6. Cleaning roller; 7. Lifting seat; 8. Separation assembly; 9. Drive unit; 10. Upper fixed plate; 11. Lower moving plate; 12. Trapezoidal transmission block; 13. Pulley; 14. Extension rod; 15. U-shaped seat; 16. Horizontal shaft; 17. Connecting plate; 18. Fixed housing; 19. Elastic element; 20. Pulling cylinder; 21. Rotating ring; 22. Movable rod; 23. 24. Gear 1; 25. Second gear 26. First drive shaft 27. Driving pulley 28. Driven pulley 29. Second drive shaft 30. Third gear 31. Fourth gear 32. First sleeve rod 33. Limiting block 34. Sliding plate 35. Second sleeve rod 36. Return spring 37. Stud 38. Limiting shaft 39. Handle 40. First slider 41. First slide groove 42. Through groove 43. Second slider 44. Second slide groove 45. Horizontal plate Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figures 1-3 The figure shows a geological surveying ruler, including a housing 1, inside which a surveying ruler 2 is elastically wound by a coil spring; it also includes: a mounting frame 3 fixed to the outside of the housing 1, a friction deceleration unit 4 for slowing down the rewinding speed of the surveying ruler 22 mounted on the top of the mounting frame 3, and rotary centrifugal units 5 mounted on both sides of the bottom of the friction deceleration unit 4; a cleaning roller 6 rotatably mounted on the front top of the mounting frame 3 for wiping and cleaning the surface of the surveying ruler 22, with lifting seats 7 rotatably connected to both sides of the cleaning roller 6, a separation component 8 mounted on the lifting seats 7, and drive units 9 mounted on both sides of the cleaning roller 6.

[0021] In this solution, after the measuring tape 2 is used up, it can automatically retract through the coil spring inside the housing 1. At this time, the measuring tape 2 and the cleaning roller 6 generate relative motion. On the one hand, the cleaning roller 6 is driven to rotate. The cleaning roller 6 drives the rotary centrifugal unit 5 through the drive unit 9. The rotary centrifugal unit 5 then drives the friction reduction unit 4. Finally, the friction reduction unit 4 will press and engage the measuring tape 2, thereby increasing the resistance of the measuring tape 2 during the winding process. On the other hand, the relative frictional motion between the surface of the cleaning roller 6 and the measuring tape 2 can clean the dirt adsorbed on the measuring tape 2.

[0022] For further details, please refer to [link / reference]. Figure 3 and Figure 4 The friction deceleration unit 4 includes an upper fixed plate 10, which is fixedly connected to the top of the mounting frame 3. A lower moving plate 11 is provided below the upper fixed plate 10. The measuring tape 2 is located between the upper fixed plate 10 and the lower moving plate 11. Two trapezoidal transmission blocks 12 are symmetrically fixed at the bottom of the lower moving plate 11. A pulley 13 is slidably connected to the bottom inclined surface of the trapezoidal transmission block 12. An extension rod 14 is fixed at the bottom of the pulley 13. The moving end of the rotary centrifugal unit 5 is fixedly connected to the bottom of the extension rod 14.

[0023] Among them, see Figure 4 The bottom of the upper fixed plate 10 is fixedly connected with four first sleeve rods 31. The first sleeve rods 31 are slidably sleeved with the lower moving plate 11. The bottom end of the first sleeve rods 31 is also fixed with a limit block 32, so that the lower moving plate 11 can slide smoothly up and down on the first sleeve rods 31. The function of the limit block 32 is to limit the sliding range of the lower moving plate 11 and prevent it from moving excessively, thereby ensuring the stability and safety of the entire device during operation.

[0024] The principle of slowing down the retraction process of the measuring tape 2 is as follows: During the retraction process of the measuring tape 2, the rotary centrifugal unit 5 will work in conjunction with it. The rotary centrifugal unit 5 will drive the extension rod 14 to move outward, thereby driving the pulley 13 at the top of the extension rod 14 to move. Since the pulley 13 and the trapezoidal transmission block 12 are slidably connected, the trapezoidal transmission block 12 will move vertically upward, thereby driving the lower moving plate 11 to move closer to the upper fixed plate 10, pressing the measuring tape 2 between the lower moving plate 11 and the upper fixed plate 10, so that the upper and lower sides of the measuring tape 2 can fit against the upper fixed plate 10 and the lower moving plate 11 respectively. In this way, when the measuring tape 2 retracts, it can generate friction and slow down the movement with the upper fixed plate 10 and the lower moving plate 11, which plays a "slow braking" effect on the retraction movement of the measuring tape 2, thereby reducing the retraction rate of the measuring tape 2.

[0025] For further details, please refer to [link / reference]. Figure 5The rotary centrifugal unit 5 includes a U-shaped seat 15 fixedly connected to the inner wall of the mounting frame 3. The U-shaped seat 15 is rotatably connected to a horizontal shaft 16 via bearings. Both ends of the horizontal shaft 16 are fixedly sleeved with connecting discs 17. Four fixed shells 18 are arranged in an array on the outer side of the connecting discs 17. An elastic element 19 is installed on one side of the fixed shell 18. A pulling cylinder 20 is sleeved on the outer side of the horizontal shaft 16. The bottom end of the extension rod 14 is fixed to the outer wall of the pulling cylinder 20. A rotating ring 21 is rotatably connected to the outer side of the pulling cylinder 20 via bearings. Four movable rods 22 are evenly hinged to the outer side of the rotating ring 21. The movable end of the elastic element 19 is rotatably connected to the end of the movable rod 22 away from the rotating ring 21. The output end of the drive unit 9 is connected to the horizontal shaft 16 for transmission. Among them, see Figure 6 The elastic element 19 includes a sliding plate 33 fixedly connected to the end of the movable rod 22 away from the rotating ring 21. The sliding plate 33 is slidably connected to the inner wall of the fixed shell 18. A second sleeve rod 34 is also fixedly fixed to the inner side of the fixed shell 18 and slidably sleeved with the sliding plate 33. A return spring 35 is provided on the outer side of the second sleeve rod 34 and between the sliding plate 33 and the inner wall of the fixed shell 18.

[0026] The principle of the rotary centrifugal unit 5 driving the extension rod 14 to move: When the measuring tape 2 retracts, it will drive the horizontal shaft 16 to rotate through the drive unit 9. The horizontal shaft 16 drives the four fixed shells 18 to rotate. Since the sliding plate 33 and the fixed shells 18 are slidably connected, when the horizontal shaft 16 rotates, it will generate centrifugal force on the sliding plate 33 under the action of the spring force of the return spring 35. This causes the sliding plate 33 in the fixed shell 18 to move away from the connecting plate 17, thereby driving the pulling cylinder 20 to move closer to the connecting plate 17, and finally driving the extension rod 14 to move together.

[0027] It should be noted that: Please refer to Figure 10 Two second sliders 42 are symmetrically fixed on the side of the pulling cylinder 20 away from the fixed shell 18. A horizontal plate 44 is fixed on the outer side of the U-shaped seat 15. A second sliding groove 43 adapted to the second sliders 42 is opened on the horizontal plate 44. The two second sliders 42 are respectively embedded in the corresponding second sliding grooves 43, so that the pulling cylinder 20 can slide stably in a straight line along the horizontal plate 44 on the outer side of the U-shaped seat 15. This not only ensures the smoothness of the movement of the pulling cylinder 20, but also effectively limits the movement range of the pulling cylinder 20 through the cooperation of the second sliders 42 and the second sliding grooves 43, preventing it from detaching from the U-shaped seat 15 due to excessive movement, thereby ensuring the reliability and stability of the entire rotary centrifugal unit 5.

[0028] It should also be noted that: Please refer to Figure 11In order to protect the friction reduction unit 4, the rotary centrifugal unit 5 and the drive unit 9, a protective cover is fixed on one side of the housing 1. This facilitates the lubrication and maintenance of the gears and prevents external particles from causing rust and interference to the gears.

[0029] Example 2: Please refer to Figure 7 and Figure 8 This embodiment further explains the first embodiment, the difference being that the driving method of the horizontal axis 16 is optimized.

[0030] Specifically, the drive unit 9 includes a first gear 23 fixedly connected to the end of the cleaning roller 6. A second gear 24 meshes with the bottom of the first gear 23. A first drive shaft 25 is fixed in the center hole of the second gear 24. The first drive shaft 25 is rotatably connected to the mounting frame 3 through a bearing seat. A drive pulley 26 is also fixedly sleeved on the outside of the first drive shaft 25. The drive pulley 26 is connected to a driven pulley 27 through a synchronous belt. A second drive shaft 28 is fixed in the center hole of the driven pulley 27. The second drive shaft 28 is also rotatably connected to the mounting frame 3 through a bearing seat. A third gear 29 is fixedly sleeved in the middle of the second drive shaft 28. A fourth gear 30 meshes with one side of the third gear 29. The fourth gear 30 is fixedly sleeved with the horizontal shaft 16. Meanwhile, it is worth noting that the diameter of the third gear 29 is larger than that of the fourth gear 30. This will increase the rotation speed of the horizontal shaft 16 driven by the fourth gear 30, and the sliding plate 33 will slide a farther distance within the fixed housing 18. This will result in greater upward pressure exerted by the lower moving plate 11 on the measuring tape 2, and also increase the frictional resistance. The mounting bracket 3 has a through groove 41, and the fourth gear 30 is located within the through groove 41, thereby enabling the fourth gear 30 to rotate smoothly.

[0031] The principle of rotating the horizontal axis 16: When the measuring tape 2 retracts, it drives the cleaning roller 6 to rotate. The cleaning roller 6 drives the first gear 23 to rotate, the first gear 23 drives the second gear 24 to rotate, the second gear 24 drives the first transmission shaft 25 to rotate, and then the drive pulley 26 fixed to the first transmission shaft 25 rotates. The drive pulley 26 drives the driven pulley 27 to rotate through the synchronous belt. The driven pulley 27 drives the second transmission shaft 28 to rotate, the second transmission shaft 28 drives the third gear 29 fixed to it to rotate, the third gear 29 drives the fourth gear 30 to rotate, and finally the fourth gear 30 drives the horizontal axis 16 to rotate.

[0032] Example 3: Please refer to Figure 8 and Figure 9 This embodiment further illustrates other embodiments, with the difference being the optimization of the usage state of the friction deceleration unit 4.

[0033] Specifically, the separation component 8 includes a stud 36 that is threadedly connected to the lifting seat 7. A limiting shaft 37 is fixed at the bottom of the stud 36. The limiting shaft 37 is rotatably connected to the outer wall of the mounting frame 3 through a bearing seat. A handle 38 is fixed at the top of the stud 36.

[0034] Specifically, before the measuring tape 2 is pulled out for measurement, the cleaning roller 6 moves upward a certain distance through the cooperation of the stud 36 and the lifting seat 7, causing the first gear 23 and the second gear 24 at one end of the cleaning roller 6 to disengage. In this way, the drive unit 9 and the cleaning roller 6 will cut off the transmission, and the friction deceleration unit 4 will not decelerate, ensuring that the measuring tape 2 is pulled out more quickly and conveniently, that is, no friction deceleration is applied when the measuring tape 2 is pulled out. When the measuring tape 2 is retrieved, the handle 38 is manually turned to drive the stud 36 to rotate. The stud 36 drives the lifting seat 7 to move down, which in turn drives the cleaning roller 6 to move down, allowing the second gear 24 and the first gear 23 to engage.

[0035] Meanwhile, it is worth noting that a first slider 39 is fixed on one side of the lifting seat 7, and a first groove 40 adapted to the slider is opened on the outer side of the mounting bracket 3. When the stud 36 rotates and drives the lifting seat 7 to move up and down, the sliding of the first slider 39 in the first groove 40 can play a stable guiding role, preventing the lifting seat 7 from deviating during the movement, ensuring that the cleaning roller 6 can accurately move up and down, thereby realizing the meshing and disengaging operation of the first gear 23 and the second gear 24, and ensuring that the different working states of the measuring tape 2 during extraction and retrieval can be accurately switched.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A surveying ruler for geological mapping, comprising: The housing (1) contains a measuring tape (2) which is elastically wound inside the housing (1) by a coil spring. Its characteristic is that it further includes: A mounting bracket (3) is fixed on the outside of the housing (1). A friction deceleration unit (4) for slowing down the rewinding speed of the measuring tape (2) is installed on the top of the mounting bracket (3). Rotary centrifugal units (5) are installed on both sides of the bottom of the friction deceleration unit (4). A cleaning roller (6) is rotatably mounted on the top front side of the mounting frame (3) and used to wipe and clean the surface of the measuring tape (2). Both sides of the cleaning roller (6) are rotatably connected to lifting seats (7). Separation components (8) are mounted on the lifting seats (7). Drive units (9) are also mounted on both sides of the cleaning roller (6).

2. The geological surveying ruler according to claim 1, characterized in that: The friction deceleration unit (4) includes an upper fixed plate (10), which is fixedly connected to the top of the mounting frame (3). A lower moving plate (11) is provided below the upper fixed plate (10). The measuring tape (2) is located between the upper fixed plate (10) and the lower moving plate (11). Two trapezoidal transmission blocks (12) are symmetrically fixed at the bottom of the lower moving plate (11). A pulley (13) is slidably connected on the bottom inclined surface of the trapezoidal transmission block (12). An extension rod (14) is fixed at the bottom of the pulley (13). The moving end of the rotary centrifugal unit (5) is fixedly connected to the bottom of the extension rod (14).

3. A geological surveying ruler according to claim 2, characterized in that: The rotary centrifugal unit (5) includes a U-shaped seat (15) fixedly connected to the inner wall of the mounting frame (3). The U-shaped seat (15) is rotatably connected to a horizontal shaft (16) via a bearing. Both ends of the horizontal shaft (16) are fixedly sleeved with connecting discs (17). Four fixed shells (18) are arranged in an array on the outer side of the connecting discs (17). An elastic element (19) is installed on one side of the fixed shell (18). A pulling cylinder (20) is sleeved on the outer side of the horizontal shaft (16). The bottom end of the extension rod (14) is fixed to the outer wall of the pulling cylinder (20). A rotating ring (21) is rotatably connected to the outer side of the pulling cylinder (20) via a bearing. Four movable rods (22) are evenly hinged to the outer side of the rotating ring (21). The movable end of the elastic element (19) is rotatably connected to the end of the movable rod (22) away from the rotating ring (21). The output end of the drive unit (9) is connected to the horizontal shaft (16) for transmission.

4. A geological surveying ruler according to claim 3, characterized in that: The drive unit (9) includes a first gear (23) fixedly connected to the end of the cleaning roller (6). A second gear (24) meshes with the bottom of the first gear (23). A first drive shaft (25) is fixed in the center hole of the second gear (24). The first drive shaft (25) is rotatably connected to the mounting frame (3) through a bearing seat. A drive pulley (26) is also fixedly sleeved on the outside of the first drive shaft (25). The drive pulley (26) is connected to a driven pulley (27) through a synchronous belt drive. A second drive shaft (28) is fixed in the center hole of the driven pulley (27). The second drive shaft (28) is also rotatably connected to the mounting frame (3) through a bearing seat. A third gear (29) is fixedly sleeved in the middle of the second drive shaft (28). A fourth gear (30) meshes with one side of the third gear (29). The fourth gear (30) is fixedly sleeved with the horizontal shaft (16).

5. A geological surveying ruler according to claim 2, characterized in that: The bottom of the upper fixed plate (10) is fixedly connected with four first sleeve rods (31), the first sleeve rods (31) and the lower moving plate (11) are slidably sleeved, and the bottom end of the first sleeve rods (31) is also fixed with a limit block (32).

6. A surveying ruler for geological mapping according to claim 3, characterized in that: The elastic element (19) includes a sliding plate (33) fixedly connected to the end of the movable rod (22) away from the rotating ring (21). The sliding plate (33) is slidably connected to the inner wall of the fixed shell (18). A second sleeve rod (34) is also fixed on the inner side of the fixed shell (18) and slidably sleeved with the sliding plate (33). A return spring (35) is provided on the outer side of the second sleeve rod (34) between the sliding plate (33) and the inner wall of the fixed shell (18).

7. A geological surveying ruler according to claim 4, characterized in that: The separation assembly (8) includes a stud (36) threadedly connected to the lifting seat (7), a limiting shaft (37) fixed at the bottom of the stud (36), the limiting shaft (37) being rotatably connected to the outer wall of the mounting frame (3) through a bearing seat, and a handle (38) fixed at the top of the stud (36).

8. A geological surveying ruler according to claim 7, characterized in that: The lifting seat (7) has a first slider (39) fixed on one side, and the mounting bracket (3) has a first groove (40) on the outside that is adapted to the slider.

9. A surveying ruler for geological mapping according to claim 4, characterized in that: The diameter of the third gear (29) is larger than that of the fourth gear (30). The mounting bracket (3) has a through groove (41), and the fourth gear (30) is located in the through groove (41).

10. A geological surveying ruler according to claim 3, characterized in that: Two second sliders (42) are symmetrically fixed on the side of the pull cylinder (20) away from the fixed shell (18). A horizontal plate (44) is fixed on the outside of the U-shaped seat (15). A second groove (43) adapted to the second slider (42) is provided on the horizontal plate (44).

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