Depth measuring device for rock-soil geological exploration

Abstract

The invention relates to the technical field of depth measurement, and discloses a depth measuring device for rock-soil geological exploration, which comprises a well depth ruler body and a steel ruler cable connected to the well depth ruler body, the cross section of the steel ruler cable is an arc-shaped plate, the inner side of the steel ruler cable is slidably connected with a fixed plate, and two sides of the fixed plate are fixedly connected with rotating shafts. The outer wall of each rotating shaft is rotationally connected with a clamping plate, the inner side of each clamping plate is attached to the outer side of the steel ruler cable, the middle of the side, away from the steel ruler cable, of each clamping plate is fixedly connected with a fixing base, the surface of each fixing base is fixedly connected with a half-stud, the two half-studs are matched in shape and position, and the outer walls of the half-studs are in threaded connection with fixing nuts. A balancing weight is connected between the fixing nut and the fixing base in a sliding mode. According to the depth measuring device for rock-soil geological exploration, the clamping plate and the fixing plate are matched with each other, so that bending deformation of a steel ruler cable is effectively limited, and the accuracy of depth measurement is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of depth measurement, and specifically provides a depth measurement device for geotechnical exploration. Background Art

[0002] In the field of geotechnical exploration, depth measurement is a crucial link. It not only relates to the accurate assessment of geological structures but also directly affects the safety and economy of subsequent engineering design and construction. Common depth measurement devices mainly include well depth rulers, etc. A well depth ruler generally includes a probe head, a steel tape cable, a winding reel, a receiving system, etc. The steel tape cable is a flexible metal strip with scale marks. During measurement, the steel tape cable is wound around the outer side of the winding reel, and then the probe head is lowered into the well using the steel tape cable. Information is sent through the sensors on the probe head and the receiving system to help the staff determine whether the probe head reaches the water surface and the bottom of the well. Subsequently, the depth of the well can be measured by the length of the steel tape cable lowered.

[0003] For example, in the prior art, the patent with the authorization announcement number CN216049771U discloses a depth measurement device for geotechnical exploration, which includes a bottom plate. A well depth ruler is fixedly connected to the top of the bottom plate, and a control device located on the right side of the well depth ruler is fixedly connected to the top of the bottom plate. A mounting plate is fixedly connected to the top of the control device, and a buffer device located above the mounting plate is movably connected inside the mounting plate. A transmission device meshing with the right side of the well depth ruler is fixedly connected to the top of the buffer device. The above-mentioned depth measurement device for geotechnical exploration has the advantages of being easy to use, etc., and solves the problem that most of the existing depth measurements for geotechnical exploration use well depth rulers for depth measurement. However, the exploration wells are often very deep. When winding up the detection line after measurement, it takes a long time to rotate the well depth ruler to pull out and wind up the detection line in the exploration well, which is time-consuming and laborious, and is also likely to delay the detection progress and is not easy to use.

[0004] However, the above-mentioned depth measurement device still has certain defects when in use: After the steel tape cable is lowered into the water, under the action of external forces such as water flow impact, the middle part of the steel tape cable may bend, resulting in a difference between the actual length of the steel tape cable and the length in a straight state, and further leading to inaccurate measurement depth. Especially in deep wells or strong water flow environments, this deviation may become particularly significant, seriously affecting the accuracy of geological structure assessment. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a depth measurement device for geotechnical exploration, which can correct the deviation of the steel tape of the steel tape cable and improve the accuracy of the measurement result.

[0006] To achieve the above object, the present invention provides the following technical solution: A depth measurement device for geotechnical exploration, including a well depth ruler body and a steel tape cable connected to the well depth ruler body. The cross-section of the steel tape cable is set as an arc-shaped plate. An inner side of the steel tape cable is slidably connected with a fixing plate. Both sides of the fixing plate are fixedly connected with rotating shafts. An outer wall of each rotating shaft is rotatably connected with a clamping plate. An inner side of the clamping plate is in contact with an outer side of the steel tape cable. A middle part of a side of each clamping plate away from the steel tape cable is fixedly connected with a fixed seat. A surface of each fixed seat is fixedly connected with a half screw column. The two half screw columns are matched in shape and position. An outer wall of the half screw column is threadedly connected with a fixing nut. A counterweight block is slidably connected between the fixing nut and the fixed seat. A fixing hole corresponding to a position of the half screw column is opened in a middle part of the counterweight block. A top of the fixing plate is fixedly connected with a connecting ring. A connecting rope is sleeved on the connecting ring. A top end of the connecting rope is connected with a winding assembly. A bottom of each clamping plate is connected with a grinding assembly. A bottom of the fixing plate is connected with a cleaning assembly.

[0007] Further, a connecting groove is opened in a middle part of the fixing plate. Two rollers are rotatably connected in the connecting groove. An outer wall of the roller is in contact with an inner side of the steel tape cable.

[0008] Further, the winding assembly includes a connecting frame, a winding shaft, a rotating plate and a connecting rod. A middle part of the connecting frame is rotatably connected with a winding shaft. A top end of the connecting rope is sleeved on an outer wall of the winding shaft. One end of the winding shaft is fixedly connected with a rotating plate. An end of the rotating plate away from the winding shaft is fixedly connected with a connecting rod.

[0009] Further, the grinding assembly includes a friction block, a clamping plate and a grinding strip. A friction block is slidably connected to a bottom of each clamping plate. A top of the friction block is fixedly connected with a clamping plate. A clamping groove corresponding to a position of the clamping plate is opened on an outer wall of the clamping plate. The clamping plate is located between the clamping plate and the counterweight block. A plurality of grinding strips are fixedly connected to an inner side of the friction block. The grinding strips are in contact with an outer side of the steel tape cable.

[0010] Further, the cleaning assembly includes a fixing block, a cleaning block and a bolt. A bottom of the fixing plate is fixedly connected with a fixing block. A cleaning block is fixedly connected to an outer wall of the fixing block. The cleaning block is in contact with an inner side of the steel tape cable. A threaded groove is opened at a bottom of the fixing plate. An installation groove corresponding to a position of the threaded groove is opened in a middle part of the fixing block. A bolt is rotatably connected in the installation groove. The bolt is threadedly connected with the threaded groove. A sealing cover is clamped in the installation groove.

[0011] Further, two symmetrically arranged fixing grooves are opened at a bottom of the counterweight block. A spring is fixedly connected in each fixing groove. The other end of the spring is in contact with an outer wall of the friction block.

[0012] Further, a handle is fixedly connected to a side of the connecting frame away from the rotating plate. A rotating sleeve is rotatably connected to an outer wall of the connecting rod.

[0013] Furthermore, a protective layer is fixedly connected to the inner wall of the clamping plate, and the outer wall of the steel tape cable fits against the inner wall of the protective layer.

[0014] Furthermore, two symmetrically arranged positioning rods are fixedly connected to the bottom of the fixed plate, and positioning grooves corresponding to the positions of the positioning rods are formed on the surface of the fixed block.

[0015] Furthermore, an anti-slip sleeve is sleeved on the outer wall of the fixing nut.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) For this depth measurement device used in rock and soil geological exploration, by the mutual cooperation of the clamping plate and the fixed plate, the bending deformation of the steel tape cable is effectively restricted. Even under complex geological and hydrological conditions, it can ensure that the steel tape cable remains in a relatively straight state, reducing the error caused by the bending of the steel tape, improving the accuracy of the measured depth, reducing the need for repeated measurements, and improving the efficiency of data collection; (2) When the roller runs with the steel tape deviation correction device, it will run on the concave surface of the steel tape cable. This rolling contact, compared with sliding contact, greatly reduces the frictional resistance, enabling the deviation correction device to slide down along the steel tape cable more smoothly, and at the same time more effectively correcting the steel tape. The roller can dynamically adapt to the minor bending and irregular shape of the steel tape cable, improving the accuracy and efficiency of deviation correction; (3) When the steel tape deviation correction device descends, the connecting rod can also be used to limit the falling speed of the steel tape deviation correction device to prevent it from falling too fast and damaging the bent steel tape cable; through this setting, the staff can precisely control the winding and unwinding speed and position of the steel tape cable to ensure the stability during the measurement process; (4) The grinding strip will polish the outer wall of the steel tape cable, removing dirt, rust or minor protrusions and other defects on the surface of the steel tape cable, achieving the cleaning of the surface of the steel tape cable, and also making it smoother and flatter, which helps to reduce the resistance when the steel tape deviation correction device descends and increases the service life of the steel tape deviation correction device; (5) Using the cleaning block can prevent the attachments on the steel tape cable from entering the connecting groove and affecting the normal operation of the roller. Compared with using a grinding strip on the outside of the steel tape cable, using a cleaning block on the inside of the steel tape cable can reduce the damage to the readings on the steel tape cable; (6) The spring can apply pressure to the friction block to ensure stable contact between the grinding strip and the steel tape cable, enabling the grinding strip to more effectively remove dirt and impurities on the surface of the steel tape cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the whole of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the winding component, the fixed plate and the clamping plate of the present invention; Figure 3 This is a three-dimensional exploded view of the fixing plate, steel tape cable, roller and clamping plate of the present invention; Figure 4 This is a three-dimensional exploded view of the fixing plate, clamping plate, counterweight and friction block of the present invention; Figure 5 This is a three-dimensional structure diagram of another form of the present invention; Figure 6 This is a three-dimensional exploded view of the fixing plate, rotating shaft, fixing block and cleaning block of the present invention; Figure 7 This is a three-dimensional exploded view of the counterweight and spring of the present invention; Figure 8 This is a three-dimensional structure diagram of the friction block, clamping block and grinding strip of the present invention; Figure 9 This is a three-dimensional structure diagram of the winding assembly and the handle of the present invention; Figure 10 This is a three-dimensional structure diagram of the winding assembly, the handle and the rotating sleeve of the present invention.

[0018] In the figure: 1, the main body of the well depth ruler; 2, the steel tape cable; 3, the fixing plate; 4, the rotating shaft; 5, the clamping plate; 6, the fixing seat; 7, the half stud; 8, the fixing nut; 9, the counterweight; 10, the fixing hole; 11, the connecting groove; 12, the roller; 13, the connecting ring; 14, the connecting rope; 15, the connecting frame; 16, the winding shaft; 17, the rotating plate; 18, the connecting rod; 19, the rotating sleeve; 20, the handle; 21, the friction block; 22, the clamping plate; 23, the clamping groove; 24, the fixing groove; 25, the spring; 26, the fixing block; 27, the cleaning block; 28, the thread groove; 29, the installation groove; 30, the bolt; 31, the positioning rod; 32, the positioning groove; 33, the sealing cover; 34, the anti-slip sleeve; 35, the grinding strip; 36, the protective layer. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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.

[0020] Please refer to Figures 1 to 10, A depth measurement device for geotechnical exploration, comprising a well depth ruler body 1 and a steel tape cable 2 connected to the well depth ruler body 1. The cross-section of the steel tape cable 2 is arranged as an arc-shaped plate. A fixed plate 3 is slidably connected to the inner side of the steel tape cable 2. Rotating shafts 4 are fixedly connected to both sides of the fixed plate 3. Clamping plates 5 are rotatably connected to the outer walls of each rotating shaft 4. The inner sides of the clamping plates 5 are in contact with the outer side of the steel tape cable 2. Fixed seats 6 are fixedly connected to the middle parts of the sides of the two clamping plates 5 away from the steel tape cable 2. Half studs 7 are fixedly connected to the surfaces of each fixed seat 6. The two half studs 7 are matched in shape and position. A fixing nut 8 is threadedly connected to the outer wall of the half stud 7. A counterweight 9 is slidably connected between the fixing nut 8 and the fixed seat 6. A fixing hole 10 corresponding to the position of the half stud 7 is opened in the middle of the counterweight 9. A connecting ring 13 is fixedly connected to the top of the fixed plate 3. A connecting rope 14 is sleeved on the connecting ring 13. The top end of the connecting rope 14 is connected to a winding assembly. A polishing assembly is connected to the bottom of each clamping plate 5. A cleaning assembly is connected to the bottom of the fixed plate 3.

[0021] In the depth measurement device for geotechnical exploration of the present invention, when performing depth measurement, first lower the probe to the bottom of the well using the steel tape cable 2, and then fix the steel tape cable 2 to prevent it from moving. Subsequently, the staff aligns the fixed plate 3 with the inner side of the steel tape cable 2 and presses it tightly. Then rotate the two clamping plates 5 to combine the two clamping plates 5 so that the two half studs 7 are aligned. Then the staff aligns the fixing hole 10 on the counterweight 9 with the half stud 7 so that the counterweight 9 is sleeved on the half stud 7. Then use the fixing nut 8 to tighten the half stud 7 and the counterweight 9. At this time, the assembly of the steel tape deviation correction device is completed. Subsequently, the staff starts the winding disc of the well depth ruler body 1 to slightly lift the steel tape cable 2 so that the bottom of the steel tape cable 2 is suspended. Then release the steel tape deviation correction device. At this time, under the action of gravity, the steel tape deviation correction device will slide down along the steel tape cable 2. When encountering a bent steel tape, since the clamping plate 5 and the fixed plate 3 clamp the steel tape cable 2 in the middle, using the extrusion force brought by gravity and the falling inertia, the steel tape is forced to return to a straight state. After the steel tape deviation correction device moves to the bottom, the staff can pull the steel tape deviation correction device to rise through the connecting rope 14, so as to perform multiple deviation corrections to ensure that the steel tape remains straight. The counterweight 9 is connected to the half stud 7 through the fixing hole 10, providing additional weight to help the steel tape cable 2 reach the target position smoothly and reducing the floating phenomenon caused by water flow impact, enhancing the anti-interference ability of the overall device. It should be noted that the reading of the steel tape cable 2 is located on the inner side, thus effectively reducing the occurrence of reading wear. By the mutual cooperation of the clamping plate 5 and the fixed plate 3, the bending deformation of the steel tape cable 2 is effectively restricted. Even under complex geological and hydrological conditions, it can ensure that the steel tape cable 2 remains in a relatively straight state, reducing the error caused by the bending of the steel tape, improving the accuracy of the measured depth, reducing the need for repeated measurements, and improving the efficiency of data collection.

[0022] As a preferred technical solution of the present invention, a connection groove 11 is formed in the middle of the fixing plate 3, and two rollers 12 are rotatably connected in the connection groove 11. The outer wall of the roller 12 is in contact with the inner side of the steel tape cable 2.

[0023] Specifically, the roller 12 can further enhance the deviation correction ability of the steel tape. Since the cross-section of the steel tape cable 2 is designed as an arc-shaped plate, when the roller 12 runs with the steel tape deviation correction device, it will run on the concave surface of the steel tape cable 2. This rolling contact greatly reduces the frictional resistance compared with sliding contact, enabling the deviation correction device to slide down along the steel tape cable 2 more smoothly, and at the same time more effectively correcting the steel tape. The roller 12 can dynamically adapt to the small bending and irregular shape of the steel tape cable 2, improving the accuracy and efficiency of deviation correction.

[0024] As a preferred technical solution of the present invention, the winding assembly includes a connection frame 15, a winding shaft 16, a rotating plate 17 and a connecting rod 18. The winding shaft 16 is rotatably connected in the middle of the connection frame 15. The top end of the connection rope 14 is sleeved on the outer wall of the winding shaft 16. One end of the winding shaft 16 is fixedly connected with a rotating plate 17, and the end of the rotating plate 17 away from the winding shaft 16 is fixedly connected with a connecting rod 18.

[0025] Specifically, when recovering the steel tape deviation correction device through the connection rope 14, the staff holds the connecting rod 18 and then rotates around the winding shaft 16, so that the connection rope 14 can be wound by the winding shaft 16, thereby applying a pulling force to the steel tape deviation correction device and lifting it to the ground. By continuously rotating the connecting rod 18, the rhythm and strength of the entire recovery process can be easily controlled; when the steel tape deviation correction device descends, the connecting rod 18 can also be used to limit the falling speed of the steel tape deviation correction device to prevent it from falling too fast and damaging the bent steel tape cable 2; through this setting, the staff can accurately control the winding and unwinding speed and position of the steel tape cable 2 to ensure the stability during the measurement process.

[0026] As a preferred technical solution of the present invention, the grinding assembly includes a friction block 21, a clamping plate 22 and a grinding strip 35. A friction block 21 is slidably connected to the bottom of each clamping plate 5. The top of the friction block 21 is fixedly connected with a clamping plate 22. A clamping groove 23 corresponding to the position of the clamping plate 22 is formed on the outer wall of the clamping plate 5. The clamping plate 22 is located between the clamping plate 5 and the counterweight 9. A plurality of grinding strips 35 are fixedly connected to the inner side of the friction block 21, and the grinding strips 35 are in contact with the outer side of the steel tape cable 2.

[0027] Specifically, during the falling process of the steel strip deviation rectifying device, the grinding strip 35 will grind the outer wall of the steel tape cable 2, removing dirt, rust, or minor protrusions and other defects on the surface of the steel tape cable 2, achieving the cleaning of the surface of the steel tape cable 2, and also making it smoother and flatter, which helps to reduce the resistance when the steel strip deviation rectifying device falls and increases the service life of the steel strip deviation rectifying device.

[0028] As a preferred technical solution of the present invention, the cleaning assembly includes a fixed block 26, a cleaning block 27, and a bolt 30. The bottom of the fixing plate 3 is fixedly connected with a fixed block 26, the outer wall of the fixed block 26 is fixedly connected with a cleaning block 27, the cleaning block 27 is in contact with the inner side of the steel tape cable 2, a threaded groove 28 is opened at the bottom of the fixing plate 3, an installation groove 29 corresponding to the position of the threaded groove 28 is opened in the middle of the fixed block 26, a bolt 30 is rotatably connected in the installation groove 29, the bolt 30 is threadedly connected with the threaded groove 28, and a sealing cover 33 is clamped in the installation groove 29.

[0029] Specifically, the cleaning block 27 is made of a material with a smooth and soft surface (such as rubber, silicone, etc.), having sufficient friction and adaptability to effectively remove dirt and impurities on the steel tape cable 2. The smooth surface can reduce the friction between the cleaning block 27 and the steel tape cable 2, reducing the impact on the movement of the steel strip deviation rectifying device. Using the cleaning block 27 can prevent the attachments on the steel tape cable 2 from entering the connection groove 11 and affecting the normal operation of the roller 12. Compared with using a grinding strip 35 on the outside of the steel tape cable 2, using a cleaning block 27 on the inside of the steel tape cable 2 can reduce the damage to the readings on the steel tape cable 2; the sealing cover 33 can seal the bolt 30 to ensure that the bolt 30 can be used normally to replace the fixed block 26 and the cleaning block 27 after long-term use.

[0030] As a preferred technical solution of the present invention, two symmetrically arranged fixing grooves 24 are opened at the bottom of the counterweight block 9, and a spring 25 is fixedly connected in each fixing groove 24, and the other end of the spring 25 is in contact with the outer wall of the friction block 21.

[0031] Specifically, the spring 25 can apply pressure to the friction block 21 to ensure stable contact between the grinding strip 35 and the steel tape cable 2, so that the grinding strip 35 can more effectively remove dirt and impurities on the surface of the steel tape cable 2.

[0032] As a preferred technical solution of the present invention, a grip 20 is fixedly connected to the side of the connecting frame 15 away from the rotating plate 17, and a rotating sleeve 19 is rotatably connected to the outer wall of the connecting rod 18.

[0033] Specifically, when the staff uses the rewinding assembly, the staff holds the grip 20 with the left hand, then holds the rotating sleeve 19 with the right hand, and then rotates around the rewinding shaft 16 to achieve rewinding; the grip 20 facilitates the staff to pick up the rewinding assembly, and the rotating sleeve 19 enables the staff to not need to change the holding position of the hand during rotation. Utilizing the rotational connection between the rotating sleeve 19 and the connecting rod 18 greatly simplifies the operation process and reduces the inconvenience and errors caused by frequently adjusting the holding position.

[0034] As a preferred technical solution of the present invention, a protective layer 36 is fixedly connected to the inner wall of the clamping plate 5, and the outer wall of the steel tape cable 2 is in contact with the inner wall of the protective layer 36.

[0035] Specifically, the protective layer 36 is a flexible corrosion-resistant material with a smooth outer surface (such as rubber, etc.). The protective layer 36 made of a flexible material can absorb and disperse the impact force from the outside, reducing the wear and damage of the steel tape cable 2.

[0036] As a preferred technical solution of the present invention, two symmetrically arranged positioning rods 31 are fixedly connected to the bottom of the fixing plate 3, and positioning grooves 32 corresponding to the positions of the positioning rods 31 are formed on the surface of the fixing block 26.

[0037] Specifically, the positioning rods 31 and the positioning grooves 32 can limit the fixing block 26, preventing the fixing block 26 from rotating or being displaced, ensuring the stability and reliability of the cleaning assembly.

[0038] As a preferred technical solution of the present invention, an anti-slip sleeve 34 is sleeved on the outer wall of the fixing nut 8.

[0039] Specifically, the anti-slip sleeve 34 is made of a material with excellent anti-slip performance and wear resistance, such as rubber, silicone, or polyurethane, etc. The outer surface of the anti-slip sleeve 34 is provided with uneven textures or bumps to increase the friction with fingers or tools and prevent slipping when rotating or tightening the fixing nut 8.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A depth measurement device for geotechnical exploration, comprising a well depth ruler body (1) and a steel tape cable (2) connected to the well depth ruler body (1), characterized in that, The cross-section of the steel tape cable (2) is arranged as an arc-shaped plate. An inner side of the steel tape cable (2) is slidably connected with a fixing plate (3). Both sides of the fixing plate (3) are fixedly connected with rotating shafts (4). An outer wall of each rotating shaft (4) is rotatably connected with a clamping plate (5). An inner side of the clamping plate (5) is in fit with an outer side of the steel tape cable (2). A middle part of a side of each clamping plate (5) away from the steel tape cable (2) is fixedly connected with a fixing seat (6). A surface of each fixing seat (6) is fixedly connected with a half stud (7). The two half studs (7) are matched in shape and position. An outer wall of the half stud (7) is threadedly connected with a fixing nut (8). A counterweight block (9) is slidably connected between the fixing nut (8) and the fixing seat (6). A fixing hole (10) corresponding to the position of the half stud (7) is formed in a middle part of the counterweight block (9). A top of the fixing plate (3) is fixedly connected with a connecting ring (13). A connecting rope (14) is sleeved on the connecting ring (13). A top end of the connecting rope (14) is connected with a winding assembly. A bottom of each clamping plate (5) is connected with a grinding assembly. A bottom of the fixing plate (3) is connected with a cleaning assembly.

2. The depth measurement device for geotechnical exploration according to claim 1, characterized in that, A connecting groove (11) is formed in a middle part of the fixing plate (3). Two rollers (12) are rotatably connected in the connecting groove (11). An outer wall of the roller (12) is in fit with an inner side of the steel tape cable (2).

3. The depth measurement device for geotechnical exploration according to claim 2, characterized in that, The winding assembly includes a connecting frame (15), a winding shaft (16), a rotating plate (17) and a connecting rod (18). A middle part of the connecting frame (15) is rotatably connected with the winding shaft (16). A top end of the connecting rope (14) is sleeved on an outer wall of the winding shaft (16). One end of the winding shaft (16) is fixedly connected with the rotating plate (17). One end of the rotating plate (17) away from the winding shaft (16) is fixedly connected with the connecting rod (18).

4. The depth measurement device for geotechnical exploration according to claim 3, characterized in that, The grinding assembly includes a friction block (21), a clamping plate (22) and a grinding strip (35). A bottom of each clamping plate (5) is slidably connected with the friction block (21). A top of the friction block (21) is fixedly connected with the clamping plate (22). A clamping groove (23) corresponding to the position of the clamping plate (22) is formed in an outer wall of the clamping plate (5). The clamping plate (22) is located between the clamping plate (5) and the counterweight block (9). A plurality of grinding strips (35) are fixedly connected to an inner side of the friction block (21). The grinding strips (35) are in fit with an outer side of the steel tape cable (2).

5. The depth measurement device for geotechnical exploration according to claim 4, characterized in that, The cleaning assembly includes a fixing block (26), a cleaning block (27) and a bolt (30). A bottom of the fixing plate (3) is fixedly connected with the fixing block (26). An outer wall of the fixing block (26) is fixedly connected with the cleaning block (27). The cleaning block (27) is in fit with an inner side of the steel tape cable (2). A threaded groove (28) is formed in a bottom of the fixing plate (3). An installation groove (29) corresponding to the position of the threaded groove (28) is formed in a middle part of the fixing block (26). A bolt (30) is rotatably connected in the installation groove (29). The bolt (30) is threadedly connected with the threaded groove (28). A sealing cover (33) is clamped in the installation groove (29).

6. The depth measurement device for geotechnical exploration according to claim 5, characterized in that, The bottom of the counterweight block (9) is provided with two symmetrically arranged fixing grooves (24), and a spring (25) is fixedly connected in each fixing groove (24). The other end of the spring (25) is in contact with the outer wall of the friction block (21).

7. The depth measurement device for geotechnical exploration according to claim 6, characterized in that, A handle (20) is fixedly connected to one side of the connecting frame (15) away from the rotating plate (17), and a rotating sleeve (19) is rotatably connected to the outer wall of the connecting rod (18).

8. The depth measurement device for geotechnical exploration according to claim 7, characterized in that, A protective layer (36) is fixedly connected to the inner wall of the clamping plate (5), and the outer wall of the steel tape cable (2) is in contact with the inner wall of the protective layer (36).

9. The depth measurement device for geotechnical exploration according to claim 8, characterized in that, Two symmetrically arranged positioning rods (31) are fixedly connected to the bottom of the fixing plate (3), and a positioning groove (32) corresponding to the position of the positioning rod (31) is formed on the surface of the fixing block (26).

10. The depth measurement device for geotechnical exploration according to claim 9, characterized in that, An anti-slip sleeve (34) is sleeved on the outer wall of the fixing nut (8).

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