Electric power investigation equipment with high stability

Abstract

The utility model provides electric power investigation equipment with high stability, and belongs to the technical field of electric power engineering investigation. The high-stability electric power investigation equipment comprises a base, a supporting mechanism is arranged at the bottom of the base, a lifting mechanism is arranged at the top of the base, and an investigation device is arranged at the top of the lifting mechanism. By arranging the first sliding block and the second sliding block which can be freely adjusted in position on the positioning column, a user can adjust the positions of the first sliding block and the second sliding block according to actual conditions, so that the unfolding distances of the first supporting frame, the second supporting frame and the third supporting frame are controlled, the overall gravity center of the exploration equipment is further controlled, and the exploration efficiency is improved. And the stability of the exploration equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power engineering investigation, in particular to electric power investigation equipment with high stability. Background Art

[0002] In power engineering projects, it is often necessary to survey the terrain in the field, find a suitable location, and record and upload the location coordinates for later planning and implementation of the power engineering project. The support poles of existing measuring devices are mostly fixed in height, and the height of the support poles cannot be adjusted according to the actual use environment, which is inconvenient for users to conduct outdoor surveys and measurements.

[0003] Patent No. CN217583917U proposes a coordinate measuring device for power engineering survey, including a measuring device, which includes a main pole, a limit bolt, a fixing bolt and a pointed foot. The coordinate measuring device for power engineering survey has a limit bolt movably installed on the top of the side of the main pole, the main pole and the extension pole are movably installed, and a coordinate measuring device is installed on the top of the extension pole. The user can adjust the height of the extension pole according to the actual measurement environment, thereby adjusting the height of the measuring device to better adapt to the outdoor environment and facilitate users to conduct outdoor surveys and measurements. By installing a rain shield, the mobile display is placed inside the equipment bracket, and the rain shield adjustment rod is movably installed with the equipment bracket, which is convenient for users to adjust the height of the rain shield adjustment rod according to the outdoor environment, and the rain shield adjustment rod is fixed at the current height by the fixing bolt to prevent sunlight from reflecting or rain from wetting the screen, causing the mobile display to be unable to be seen clearly.

[0004] When using the existing device, the user needs to manually support the main pole for surveying. This measurement method will affect the overall stability of the device due to the inevitable shaking of the user. When surveying in mountainous areas, especially on rainy days, there are mostly slippery dirt roads. The user alone cannot maintain the stability of the equipment and may even slip, causing the equipment to hit the ground.

[0005] Therefore, the present application provides a highly stable power survey equipment to meet the needs. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a high-stability electric power survey equipment to solve the problem that the existing measuring device needs to be installed on the transmission tower and the installation process is highly dangerous.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] A highly stable electric power survey equipment comprises a base, a support mechanism is arranged at the bottom of the base, a lifting mechanism is arranged at the top of the base, and a survey device is arranged at the top of the lifting mechanism;

[0009] A support mechanism, the support mechanism includes a positioning column, a first slider, a second slider, a first support frame, a second support frame and a third support frame, the positioning column is fixedly installed at the bottom of the base, one side of the positioning column is movably connected with the first slider, and one side of the positioning column is also movably connected with the second slider, the first slider and the second slider both include a damping block and a bolt, the damping block is movably installed inside the first slider, one side of the damping block is fixedly connected with a bolt, and the bolt is threadedly sleeved on one side of the first slider. Due to the large friction between the damping block and the positioning column, when it is necessary to fix the position of the first slider on the positioning column, the static friction between the damping block and the positioning column can be increased by rotating the bolt to drive the damping block close to the positioning column, thereby fixing the first slider and the second slider on one side of the positioning column.

[0010] As a preferred solution, the first support frame, the second support frame and the third support frame are all arranged on one side of the first slider, and the first support frame, the second support frame and the third support frame all include a first positioning block, a main rod, a first positioning hole, a positioning pin, a secondary rod, a second positioning block, a positioning groove, a first magnetic block, a gripping rod, a second magnetic block, a gripping plate and a second positioning hole, the first positioning block is fixedly installed on one side of the first slider, one side of the first positioning block is movably connected with the main rod, one side of the main rod is provided with a first positioning hole, the bottom of the main rod is provided with a positioning groove, the interior of the positioning groove is fixedly installed with the first magnetic block, the bottom of the positioning groove is provided with a second positioning hole, one side of the second positioning hole is movably installed with the gripping rod, one side of the gripping rod is fixedly connected with the gripping plate, one side of the gripping rod is fixedly installed with the second magnetic block, one side of the first positioning hole is movably installed with the secondary rod through the positioning pin, the bottom of the secondary rod is movably connected with the second positioning block, and the second positioning block is fixedly installed on the top of the second slider. By taking advantage of the fact that the raised part of the gripping plate has a greater pressure in contact with the ground, when the gripping rod needs to be fixed to the ground to provide support, the gripping rod only needs to be flipped around the second positioning hole until the gripping rod is parallel to the ground. The operator then steps on the top of the gripping rod with his foot to apply pressure to the gripping plate. At this time, the gripping plate is forced to sink into the ground, increasing the friction between the gripping rod and the ground.

[0011] As a preferred solution, the first magnetic block is magnetically connected to one side of the second magnetic block, and the gripping rod is movably installed inside the positioning groove.

[0012] As a preferred solution, the main rod is movably connected to one side of the second sliding block, and the gripping plate is composed of a plurality of ratchet protrusions arranged linearly.

[0013] As a preferred solution, the lifting mechanism includes an airtight shell, a micro air pump, an air inlet pipe, an air outlet pipe, a one-way ball valve, a spring and a limit column. The airtight shell is fixedly installed on the top of the base, and a micro air pump is fixedly installed inside the airtight shell. One side of the micro air pump is connected to the air inlet pipe, and the other side of the micro air pump is connected to the air outlet pipe. One side of the airtight shell is fixedly connected to the limit column, and one side of the limit column is movably connected to the one-way ball valve. One side of the one-way ball valve is provided with a spring, one side of the spring is fixedly connected to the bottom of the one-way ball valve, and the other side of the spring is fixedly connected to one side of the airtight shell. Through the elastic force and ductility of the spring itself, when it is necessary to discharge the high-pressure air inside the airtight shell, it is only necessary to press the one-way ball valve by hand to drive the one-way ball valve to separate from the airtight shell. At this time, the air inside the airtight shell is discharged. When the hand is released, the spring pushes the one-way ball valve to one side of the airtight shell, and the one-way ball valve is reset. The air inside the airtight shell is blocked by the one-way ball valve and cannot be released.

[0014] As a preferred solution, the lifting mechanism further includes a first telescopic tube, a second telescopic tube, a third telescopic tube, a fourth telescopic tube and a vent hole, the first telescopic tube is fixedly mounted on the top of the airtight housing, one side of the first telescopic tube is movably sleeved with the second telescopic tube, one side of the second telescopic tube is movably sleeved with the third telescopic tube, and one side of the third telescopic tube is movably sleeved with the fourth telescopic tube. A closed cavity whose size can be freely adjusted is formed by the first telescopic tube, the second telescopic tube, the third telescopic tube and the fourth telescopic tube, after a large amount of air is filled in the closed cavity, the second telescopic tube, the third telescopic tube and the fourth telescopic tube are propped up by the expanded high-pressure gas, thereby supporting the surveying device on the top of the fourth telescopic tube.

[0015] As a preferred solution, the first telescopic tube is connected to the airtight housing, and the fourth telescopic tube is fixedly connected to the bottom of the surveying device.

[0016] Compared with the prior art, the utility model has at least the following beneficial effects:

[0017] 1. A highly stable electric power survey equipment, by setting a first slider, by setting a first slider and a second slider that can be freely adjusted on a positioning column, the user can adjust the position of the first slider and the second slider according to actual conditions, thereby controlling the unfolding distance of the first support frame, the second support frame and the third support frame, and further achieving the purpose of controlling the center of gravity of the entire survey equipment and increasing the stability of the survey equipment.

[0018] 2. A highly stable electric power survey equipment, which raises and lowers the survey device by setting a first telescopic tube and using a micro air pump to provide power to the first telescopic tube, the second telescopic tube, the third telescopic tube and the fourth telescopic tube. Compared with a device that directly uses a transmission shaft such as a screw rod for lifting, the weight of air is lighter. When conducting electric power surveys in remote mountainous areas, this device can reduce the overall weight of the equipment, making it easier for users to carry it on rugged mountain roads. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable those skilled in the relevant art to make and use the present disclosure.

[0020] Figure 1 This is a schematic diagram of the main structure of a high-stability electric power survey equipment;

[0021] Figure 2 It is a schematic diagram of the main structure of a supporting mechanism of a power survey equipment with high stability;

[0022] Figure 3 It is a schematic diagram of the partial structure of a supporting mechanism of a power survey equipment with high stability;

[0023] Figure 4 It is a schematic diagram of the exploded structure of the support mechanism;

[0024] Figure 5 It is a schematic diagram of the main structure of the lifting mechanism;

[0025] Figure 6 It is a schematic diagram of the local structure of the lifting mechanism;

[0026] Figure 7 This is a schematic diagram of the decomposed structure of the lifting mechanism.

[0027] [reference numerals]

[0028] 1. base; 2. support mechanism; 21. first support frame; 22. second support frame; 23. third support frame; 201. positioning column; 202. first slider; 203. second slider; 204. damping block; 205. bolt; 206. first positioning block; 207. main rod; 208. first positioning hole; 209. positioning pin; 210. auxiliary rod; 211. second positioning block; 212. positioning groove; 213. first magnetic block; 214 , grip rod; 215, second magnetic block; 216, grip plate; 217, second positioning hole; 3, lifting mechanism; 301, airtight casing; 302, micro air pump; 303, air inlet pipe; 304, air outlet pipe; 305, one-way ball valve; 306, spring; 307, limit column; 308, first telescopic tube; 309, second telescopic tube; 310, third telescopic tube; 311, fourth telescopic tube; 312, air vent; 4, surveying device.

[0029] As shown in the figure, in order to clearly implement the structure of the embodiment of the utility model, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the utility model to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Example

[0032] like Figure 1 As shown, an embodiment of the utility model provides a highly stable power survey device, comprising a base 1, a support mechanism 2 is provided at the bottom of the base 1, a lifting mechanism 3 is provided at the top of the base 1, and a survey device 4 is provided at the top of the lifting mechanism 3;

[0033] like Figure 2 , Figure 3 and Figure 4As shown, the support mechanism 2 includes a positioning column 201, a first slider 202, a second slider 203, a first support frame 21, a second support frame 22 and a third support frame 23. The positioning column 201 is fixedly installed at the bottom of the base 1, and the first slider 202 is movably connected to one side of the positioning column 201. The second slider 203 is also movably connected to one side of the positioning column 201. The first slider 202 and the second slider 203 both include a damping block 204 and a bolt 205. The damping block 204 is movably installed inside the first slider 202, and one side of the damping block 204 is fixedly connected to the bolt 205, and the bolt 205 is threadedly sleeved on one side of the first slider 202.

[0034] The first support frame 21, the second support frame 22 and the third support frame 23 are all arranged on one side of the first slider 202. The first support frame 21, the second support frame 22 and the third support frame 23 all include a first positioning block 206, a main rod 207, a first positioning hole 208, a positioning pin 209, a secondary rod 210, a second positioning block 211, a positioning groove 212, a first magnetic block 213, a gripping rod 214, a second magnetic block 215, a gripping plate 216 and a second positioning hole 217. The first positioning block 206 is fixedly installed on one side of the first slider 202, and one side of the first positioning block 206 is movably connected with the main rod 207, and one side of the main rod 207 is provided with There is a first positioning hole 208, a positioning groove 212 is provided at the bottom of the main rod 207, a first magnetic block 213 is fixedly installed inside the positioning groove 212, a second positioning hole 217 is provided at the bottom of the positioning groove 212, a gripping rod 214 is movably installed on one side of the second positioning hole 217, a gripping plate 216 is fixedly connected to one side of the gripping rod 214, a second magnetic block 215 is fixedly installed on one side of the gripping rod 214, a sub-rod 210 is movably installed on one side of the first positioning hole 208 through a positioning pin 209, a second positioning block 211 is movably connected to the bottom of the sub-rod 210, and the second positioning block 211 is fixedly installed on the top of the second sliding block 203.

[0035] The first magnetic block 213 is magnetically connected to one side of the second magnetic block 215 , and the gripping rod 214 is movably installed inside the positioning groove 212 .

[0036] The main rod 207 is movably connected to one side of the second sliding block 203, and the gripping plate 216 is composed of a plurality of ratchet protrusions arranged linearly.

[0037] It needs to be further explained that: when the survey equipment needs to be fixed on the cement floor, first manually rotate the bolts 205 on the first slider 202 and the second slider 203 clockwise to drive the damping block 204 to disengage from the positioning column 201. At this time, the first slider 202 and the second slider 203 can move freely on the positioning column 201. Then, manually unfold the main rod 207 to a suitable angle according to the available space on the ground, and finally move the first slider 202 and the second slider 203 downward at the same time until the first support frame 21, the second support frame 22 and the third support frame 23 touch the ground. Then, rotate the bolts 205 counterclockwise to fix the first slider 202 and the second slider 203. When encountering a dirt road on a rainy day, the road is relatively slippery. At this time, the gripping rod 214 is manually pulled out from the inner top of the positioning slot 212 to control the gripping rod 214 to rotate clockwise around the second positioning hole 217. During this process, the magnetic force between the first magnetic block 213 on one side of the positioning slot 212 and the second magnetic block 215 on one side of the gripping rod 214 is weakened, and the gripping rod 214 is separated from the positioning slot 212. Then, when the gripping rod 214 is rotated to be parallel to the ground, the gripping plate 216 at the bottom of the gripping rod 214 contacts the surface of the dirt road. The gripping plate 216 is fixed to the dirt road by stepping on the gripping rod 214 with the foot. At this time, under the action of the gripping plate 216, the device is not easy to slip under the action of external force.

[0038] like Figure 5 , Figure 6 and Figure 7 As shown, the lifting mechanism 3 includes an airtight shell 301, a micro air pump 302, an air inlet pipe 303, an air outlet pipe 304, a one-way ball valve 305, a spring 306 and a limiting column 307. The airtight shell 301 is fixedly installed on the top of the base 1, and the micro air pump 302 is fixedly installed inside the airtight shell 301. One side of the micro air pump 302 is connected to the air inlet pipe 303, and the other side of the micro air pump 302 is connected to the air outlet pipe 304. One side of the airtight shell 301 is fixedly connected to the limiting column 307, and one side of the limiting column 307 is movably connected to the one-way ball valve 305. One side of the one-way ball valve 305 is provided with a spring 306, one side of the spring 306 is fixedly connected to the bottom of the one-way ball valve 305, and the other side of the spring 306 is fixedly connected to one side of the airtight shell 301.

[0039] The lifting mechanism 3 also includes a first telescopic tube 308, a second telescopic tube 309, a third telescopic tube 310, a fourth telescopic tube 311 and a vent hole 312. The first telescopic tube 308 is fixedly installed on the top of the airtight shell 301, and the second telescopic tube 309 is movably connected to one side of the first telescopic tube 308, the third telescopic tube 310 is movably connected to one side of the second telescopic tube 309, and the fourth telescopic tube 311 is movably connected to one side of the third telescopic tube 310.

[0040] The first telescopic tube 308 is in communication with the airtight housing 301 , and the fourth telescopic tube 311 is fixedly connected to the bottom of the surveying device 4 .

[0041] It is necessary to further explain that: when it is necessary to raise the height of the surveying device 4 for surveying, the micro air pump 302 is started to draw the outside air through the air inlet pipe 303 and then discharge it into the inside of the airtight shell 301 through the air outlet pipe 304. As the air inside the airtight shell 301 continues to increase, the air pressure inside the airtight shell 301 and the first telescopic tube 308 gradually increases, so that the second telescopic tube 309, the third telescopic tube 310 and the fourth telescopic tube 311 are slowly lifted up, and then the surveying device 4 on the top of the fourth telescopic tube 311 is lifted up. During the process, the air at the connection between the first telescopic tube 308, the second telescopic tube 309, the third telescopic tube 310 and the fourth telescopic tube 311 will be discharged through the vent hole 312; when the height of the surveying device 4 needs to be lowered, the one-way ball valve 305 is manually pressed. At this time, the ball of the one-way ball valve 305 located inside the airtight shell 301 no longer blocks the high-pressure air inside the airtight shell 301. When no more exhaust is required, the one-way ball valve 305 can be released. At this time, the spring 306 will apply elastic force to the one-way ball valve 305, driving the one-way ball valve 305 to reset and block the gas from being discharged.

[0042] Working principle and use process of the utility model: During the use of the utility model, when a high-stability power survey equipment is used, first, when the survey equipment needs to be fixed on the cement floor, first manually rotate the bolts 205 on the first slider 202 and the second slider 203 clockwise to drive the damping block 204 to disengage from the positioning column 201. At this time, the first slider 202 and the second slider 203 can move freely on the positioning column 201, and then manually unfold the main rod 207 to a suitable angle according to the available space on the ground, and finally move the first slider 202 and the second slider 203 downward at the same time until the first support frame 21, the second support frame 22 and the third support frame 23 contact the ground, then rotate the bolts 205 counterclockwise to fix the first slider 202 and the second slider 203;

[0043] Next, when encountering a dirt road on a rainy day, the road is relatively slippery. At this time, the grip rod 214 is manually pulled out from the inner top of the positioning slot 212 to control the grip rod 214 to rotate clockwise around the second positioning hole 217. During this process, the magnetic force between the first magnetic block 213 on one side of the positioning slot 212 and the second magnetic block 215 on one side of the grip rod 214 is weakened, and the grip rod 214 is disengaged from the positioning slot 212. Then, when the grip rod 214 is rotated to be parallel to the ground, the grip plate 216 at the bottom of the grip rod 214 contacts the surface of the dirt road. The grip plate 216 is fixed to the dirt road by stepping on the grip rod 214 with the foot. At this time, under the action of the grip plate 216, the device is not easy to slip under the action of external force.

[0044] Next, when it is necessary to raise the height of the surveying device 4 for surveying, the micro air pump 302 is started to extract the outside air through the air inlet pipe 303 and then discharge it into the airtight housing 301 through the air outlet pipe 304. As the air inside the airtight housing 301 continues to increase, the air pressure inside the airtight housing 301 and the first telescopic tube 308 gradually increases, so that the second telescopic tube 309, the third telescopic tube 310 and the fourth telescopic tube 311 are slowly lifted up, and then the surveying device 4 on the top of the fourth telescopic tube 311 is lifted up. In this process, the air at the connection between the first telescopic tube 308, the second telescopic tube 309, the third telescopic tube 310 and the fourth telescopic tube 311 will be discharged through the air vent 312.

[0045] Finally, when it is necessary to lower the height of the surveying device 4, the one-way ball valve 305 is manually pressed. At this time, the ball of the one-way ball valve 305 located inside the airtight shell 301 no longer blocks the high-pressure air inside the airtight shell 301. When the gas is no longer exhausted, the one-way ball valve 305 can be released. At this time, the spring 306 will apply elastic force to the one-way ball valve 305, driving the one-way ball valve 305 to reset and block the gas from being discharged.

[0046] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A highly stable power survey equipment, characterized in that: It comprises a base (1), a supporting mechanism (2) is arranged at the bottom of the base (1), a lifting mechanism (3) is arranged at the top of the base (1), and a surveying device (4) is arranged at the top of the lifting mechanism (3); A support mechanism (2), the support mechanism (2) comprising a positioning column (201), a first slider (202), a second slider (203), a first support frame (21), a second support frame (22) and a third support frame (23), the positioning column (201) being fixedly mounted on the bottom of a base (1), one side of the positioning column (201) being movably connected to the first slider (202), one side of the positioning column (201) being also movably connected to the second slider (203), the first slider (202) and the second slider (203) both comprising a damping block (204) and a bolt (205), the damping block (204) being movably mounted inside the first slider (202), one side of the damping block (204) being fixedly connected to the bolt (205), and the bolt (205) being threadedly sleeved on one side of the first slider (202).

2. The high-stability electric power survey equipment according to claim 1, characterized in that: The first support frame (21), the second support frame (22) and the third support frame (23) are all arranged on one side of the first sliding block (202); the first support frame (21), the second support frame (22) and the third support frame (23) all comprise a first positioning block (206), a main rod (207), a first positioning hole (208), a positioning pin (209), a secondary rod (210), a second positioning block (211), a positioning groove (212), a first magnetic block (213), a gripping rod (214), a second magnetic block (215), a gripping plate (216) and a second positioning hole (217); the first positioning block (206) is fixedly mounted on one side of the first sliding block (202); one side of the first positioning block (206) is movably connected to the main rod (207); one side of the main rod (207) is provided with a A first positioning hole (208) is provided, a positioning groove (212) is provided at the bottom of the main rod (207), a first magnetic block (213) is fixedly installed inside the positioning groove (212), a second positioning hole (217) is provided at the bottom of the positioning groove (212), a gripping rod (214) is movably installed on one side of the second positioning hole (217), a gripping plate (216) is fixedly connected to one side of the gripping rod (214), a second magnetic block (215) is fixedly installed on one side of the gripping rod (214), a secondary rod (210) is movably installed on one side of the first positioning hole (208) via a positioning pin (209), a second positioning block (211) is movably connected to the bottom of the secondary rod (210), and the second positioning block (211) is fixedly installed on the top of the second sliding block (203).

3. The high-stability electric power survey equipment according to claim 2, characterized in that: The first magnetic block (213) is magnetically connected to one side of the second magnetic block (215), and the gripping rod (214) is movably installed inside the positioning groove (212).

4. The high-stability electric power survey equipment according to claim 2, characterized in that: The main rod (207) is movably connected to one side of the second sliding block (203), and the gripping plate (216) is composed of a plurality of ratchet protrusions arranged linearly.

5. The high-stability electric power survey equipment according to claim 1, characterized in that: The lifting mechanism (3) comprises an airtight housing (301), a micro air pump (302), an air inlet pipe (303), an air outlet pipe (304), a one-way ball valve (305), a spring (306) and a limit column (307); the airtight housing (301) is fixedly mounted on the top of the base (1); the micro air pump (302) is fixedly mounted inside the airtight housing (301); one side of the micro air pump (302) is connected to the air inlet pipe (303); the micro air pump (302) is The other side of (302) is connected to an air outlet pipe (304), one side of the airtight housing (301) is fixedly connected to a limiting column (307), one side of the limiting column (307) is movably connected to a one-way ball valve (305), one side of the one-way ball valve (305) is provided with a spring (306), one side of the spring (306) is fixedly connected to the bottom of the one-way ball valve (305), and the other side of the spring (306) is fixedly connected to one side of the airtight housing (301).

6. The high-stability electric power survey equipment according to claim 1, characterized in that: The lifting mechanism (3) further comprises a first telescopic tube (308), a second telescopic tube (309), a third telescopic tube (310), a fourth telescopic tube (311) and a vent hole (312); the first telescopic tube (308) is fixedly mounted on the top of the airtight housing (301); one side of the first telescopic tube (308) is movably sleeved with the second telescopic tube (309); one side of the second telescopic tube (309) is movably sleeved with the third telescopic tube (310); and one side of the third telescopic tube (310) is movably sleeved with the fourth telescopic tube (311).

7. The high-stability electric power survey equipment according to claim 6, characterized in that: The first telescopic tube (308) is in communication with the airtight housing (301), and the fourth telescopic tube (311) is fixedly connected to the bottom of the surveying device (4).

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