A multi-purpose engineering surveying instrument with a protective structure

Abstract

This invention relates to the field of protective structure technology, specifically disclosing a multi-purpose engineering surveying instrument with a protective structure, including a mounting base. The surveying instrument body is mounted on the upper surface of the mounting base. Symmetrical sliding mounting plates are rotatably mounted on the outer side of the mounting base. An arc-shaped protective cover is slidably mounted on the outer side and inner side of two adjacent sliding mounting plates. The cooperation of the sliding mounting plates, springs, and arc-shaped protective covers can resist external impacts and prevent damage to the surveying instrument body. A fan is fixedly installed inside the baffle. Under the action of the fan, ventilation can be carried out from left to right. The ventilation can cool down the surveying instrument body, ensuring that the surveying instrument body is always at a suitable temperature and preventing excessively high temperatures from affecting the surveying instrument body.

Description

Technical Field

[0001] This invention relates to the field of protective structure technology, and in particular to a multi-purpose engineering surveying instrument with a protective structure. Background Technology

[0002] In the field of engineering surveying, surveying instruments are core tools, and their performance and stability directly affect the accuracy of surveying results and work efficiency.

[0003] However, traditional surveying instruments often face many challenges during use, such as poor environmental adaptability and insufficient protection capabilities. These problems greatly limit the application of surveying instruments in variable engineering environments.

[0004] Especially under severe weather conditions, such as sandstorms, rain, and high temperatures, surveying instruments are easily damaged, leading to the interruption of surveying work. This not only increases surveying costs but may also delay the progress of the project.

[0005] Secondly, the brackets used in commercially available surveying instruments only penetrate about 4 centimeters into the soil, resulting in poor protection and support.

[0006] Therefore, in order to solve the above problems and protect the safety of the surveying instrument, a multi-purpose engineering surveying instrument with a protective structure is proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a multi-purpose engineering surveying instrument with a protective structure to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a multi-purpose engineering surveying instrument with a protective structure, including a mounting base, wherein the surveying instrument body is disposed on the upper end surface of the mounting base; An adjusting threaded rod is provided below the mounting base, and a secondary seat is fixedly installed on the outer circumferential surface of the adjusting threaded rod; The lower end face of the sub-seat is rotatably mounted with a U-shaped slide rod in a circular array, and a mounting plate is fixedly mounted on the outer side of the lower end of the U-shaped slide rod; The mounting plate is rotatably mounted with a fastening knob from the outer side to the inner side, and the U-shaped slide rod is slidably mounted with an auxiliary support leg inside. A symmetrical sliding mounting plate is rotatably mounted on the outer side of the mounting base. An arc-shaped protective cover is slidably installed on the outer side and inner side of two horizontally adjacent sliding mounting plates, and the surveying instrument body is located inside the arc-shaped protective cover.

[0009] Preferably, symmetrical springs are fixedly installed on the inner ground of the sliding groove mounting plate. The upper end of the springs is fixedly connected to the lower end of the arc-shaped protective cover. The lower end of the arc-shaped protective cover is slidably installed inside the sliding groove mounting plate. Baffles are rotatably installed at both ends of the arc-shaped protective cover. Through slots are opened from the outer side to the inner side of the baffles. Fans are evenly fixedly installed in a ring array inside the through slots.

[0010] Preferably, a housing is fixedly installed at the inner edge of the through slot, and inclined plates are evenly fixedly installed in a ring array at the inner edge of the housing. An installation ring is fixedly installed inside the inclined plates, and inclined sliding slots are formed on the outer and inner sides of the inclined plates.

[0011] Preferably, an arc-shaped opening is formed from the outer circumferential surface of the outer shell to the interior, and an adjusting gear is rotatably arranged inside the arc-shaped opening. The rear end face of the adjusting gear is rotatably mounted on the outer side of the baffle via a cylinder.

[0012] Preferably, a gear ring is rotatably mounted inside the outer casing. A hexagonal groove is formed on the inner side of the gear ring. A slider is slidably mounted at the corner of the straight side inside the hexagonal groove. A sealing plate is fixedly mounted on the inner side of each slider. A sliding column is fixedly mounted at the center of the inner side of the sealing plate. The sliding column is slidably mounted inside the sliding groove hole.

[0013] Preferably, a mounting support is fixedly mounted on the lower end of the mounting base, and an adjusting threaded seat is fixedly mounted inside the mounting support. A screw is rotatably mounted from the lower end face to the upper end face of the adjusting threaded seat, and the upper end of the screw extends to the upper end of the mounting base and is rotatably connected to the lower end of the surveying instrument body via a thread.

[0014] Preferably, an adjusting threaded rod is rotatably mounted on the lower end of the mounting support, a support column is provided on the outer side of the lower end of the adjusting threaded rod, and a first adjusting threaded ring is rotatably mounted on the upper end of the support column. The first adjusting threaded ring and the adjusting threaded rod are rotatably connected by threads.

[0015] Preferably, the outer circumferential surface of the support column is provided with an external thread, and a second adjusting threaded ring is rotatably installed on the outer thread of the support column. The lower end of the second adjusting threaded ring is provided with a uniformly arranged sliding groove frame rod in an annular array. U-grooves are provided on both inner sides of the sliding groove frame rod. A connecting limiting block is slidably installed inside the U-grooves. A limiting support rod is rotatably installed at the lower end of the connecting limiting block.

[0016] Preferably, a U-shaped seat is provided on the outer side of the lower end of the support column, and an installation groove is fixedly installed on the lower end face of the U-shaped seat. An installation groove is formed from the inside of the installation groove to the upper end face of the U-shaped seat, and the lower end of the support column is slidably installed inside the installation groove.

[0017] Preferably, the lower end of the U-shaped seat has a first groove on both sides, a first support seat is slidably installed inside the first groove, the U-shaped seat has a U-shaped groove on both sides, a first support rod in a symmetrical state is rotatably installed inside the U-shaped groove, the lower end of the first support rod has a first threaded hole, and a first threaded support rod is rotatably installed inside the first threaded hole.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the cooperation of a sliding mounting plate, spring and arc-shaped protective cover, can resist external impact and prevent damage to the surveying instrument body. A fan is fixedly installed inside the baffle. Under the action of the fan, ventilation can be carried out on both sides. Under the effect of ventilation, the surveying instrument body can be cooled down, so that the surveying instrument body is always at a suitable temperature and avoids excessively high temperature from affecting the surveying instrument body.

[0019] 2. In this invention, the sealing plate is driven by a slider to slide along the groove hole of the inclined plate, thereby realizing the automatic opening and closing of the through groove hole. This structure solves the problem of single protection of traditional surveying instruments. It can isolate pollutants through the sealing plate in severe weather such as wind, sand and rain, and can also close the protective cover to form full protection when not in use. This greatly reduces the failure rate of equipment caused by environmental factors and improves its durability in complex engineering scenarios.

[0020] 3. In this invention, the second adjusting threaded ring can move the sliding frame rod up and down, and during the movement, the connecting limiting block and the limiting support rod can move up and down synchronously. When the movement reaches a suitable height, the sliding limiting block and the limiting support rod can slide out of the interior of the sliding frame rod and then rotate. At this time, the lower end of the limiting support rod extends into the interior of the soil, and its extension length can ensure the safety of the surveying instrument body and prevent the support from collapsing when touched. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is an external view of the structure of the present invention; Figure 2 This is an external view of the main structure of the present invention; Figure 3 This is a schematic diagram of the U-shaped seat of the present invention; Figure 4 This is a structural diagram of the U-shaped seat, the first support seat, and the first support rod of the present invention; Figure 5 This is a schematic diagram of the support column of the present invention; Figure 6 This is a structural diagram of the support column and sliding frame rod of the present invention; Figure 7 This is a structural diagram of the slide frame rod and the limiting support rod of the present invention; Figure 8 This is a schematic diagram of the adjusting threaded rod and the slide mounting plate of the present invention; Figure 9 This is a schematic diagram of the surveying instrument body of the present invention; Figure 10 This is a structural diagram of the groove mounting plate and arc-shaped protective cover of the present invention; Figure 11 This is a schematic diagram of the interior of the arc-shaped protective cover of the present invention; Figure 12 This is a schematic diagram of the baffle, the sliding groove mounting plate, and the arc-shaped protective cover of the present invention; Figure 13 This is a diagram of the baffle structure of the present invention; Figure 14 This is a schematic diagram of the outer casing, gear ring, and sealing plate of the present invention; Figure 15 This is a schematic diagram of the housing, gear ring, and sealing plate of the present invention.

[0023] Explanation of reference numerals in the attached figures: 1. U-shaped seat; 101. First groove; 102. Mounting slot tube; 103. Mounting slot; 104. U-shaped groove; 105. First support seat; 106. First support rod; 107. First threaded hole; 108. First threaded support rod; 2. Support column; 201. First adjusting threaded ring; 202. Second adjusting threaded ring; 203. Slide frame rod; 204. U-groove; 205. Connecting limit block; 206. Limiting support rod; 207. External thread; 3. Adjusting threaded rod; 301. Mounting support; 302. Mounting seat; 303. Adjusting threaded seat; 304. Screw; 4. Surveying instrument body; 5. Slide mounting plate; 501. Spring; 502. Arc-shaped protective cover; 6. Baffle; 601. Through slot; 602. Fan; 7. Housing; 701. Inclined plate; 702. Slide hole; 703. Mounting ring; 704. Arc-shaped opening; 705. Adjusting gear; 706. Gear ring; 707. Hexagonal groove; 708. Sealing plate; 709. Sliding column; 710. Sliding block; 8. Subsidiary seat; 801. U-shaped sliding rod; 802. Mounting piece; 803. Fastening knob; 804. Auxiliary support leg. Detailed Implementation

[0024] 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.

[0025] Please see Figures 1 to 15 The present invention provides a technical solution: A multi-purpose engineering surveying instrument with a protective structure includes a U-shaped base 1. First grooves 101 are formed on both sides of the lower end of the U-shaped base 1, extending into the interior. A mounting tube 102 is fixedly installed at the center of the lower end face of the U-shaped base 1. A mounting groove 103 is formed from the upper end face of the U-shaped base 1 to the lower end face of the mounting tube 102. U-shaped grooves 104 are formed on both the front and rear sides of the U-shaped base 1. First support rods 106 are rotate symmetrically positioned inside the front and rear U-shaped grooves 104. A first threaded hole 107 is formed at the lower end of the first support rod 106, extending into the interior. A first threaded support rod 108 is installed on the threaded rotating rod from the inside to the outside of the first threaded hole 107. Figure 3 As shown. Then, a first support seat 105 is slidably installed inside the first groove 101.

[0026] During use, the U-shaped seat 1 and the mounting groove tube 102 work together to slide the subsequent support column 2, thereby limiting and fixing the support column 2 and keeping it in a vertical position.

[0027] At this time, the operator manually pulls out the first support seat 105. The first support seat 105 increases the height of the U-shaped seat 1 from the ground, which further restricts the lower end of the support column 2 and ensures that the support column 2 is not restricted too low, which would cause the support column 2 to tilt.

[0028] Then, during use, the first support rod 106 is rotated, and the first support rod 106 is in a paired state. Then, the first threaded support rod 108 is rotated, and the lower end of the first threaded support rod 108 can contact the ground. During the contact process, it can form a lateral limiting operation for the subsequent support column 2, ensuring that the support column 2 will not tilt to the front or back, further ensuring that the support column 2 will not tilt, and thus ensuring the safety of the subsequent surveying instrument body 4.

[0029] A support column 2 is slidably installed inside the mounting slot 103. A first adjusting threaded ring 201 is rotatably installed on the top of the support column 2. An adjusting threaded rod 3 is slidably installed from the inside to the outside of the support column 2. The adjusting threaded rod 3 and the first adjusting threaded ring 201 are threadedly rotatably connected. At this time, during use, the operator can manually rotate the first adjusting threaded ring 201 to adjust the height of the adjusting threaded rod 3 up and down, thereby changing the height of the support and the height of the surveying instrument body 4, so as to realize the auxiliary operation for people of different heights.

[0030] An external thread 207 is formed on the outer circumferential surface of the support column 2. A second adjusting threaded ring 202 is rotatably mounted on the outer circumferential surface of the external thread 207. A sliding frame rod 203 is evenly rotatably mounted in a ring array on the lower end face of the second adjusting threaded ring 202. The outer and inner sides of the sliding frame rod 203 are in a through state. U-grooves 204 are formed on both inner side walls of the sliding frame rod 203. A connecting limiting block 205 is slidably mounted inside the U-grooves 204. The connecting limiting block 205 can slide inside the sliding frame rod 203. It should be noted that the lower end of the sliding frame rod 203 is in a through state, but the U-grooves 204 are not through. Therefore, it can be ensured that the connecting limiting block 205 will not slide out of the sliding frame rod 203. Figure 6 As shown.

[0031] A limiting support rod 206 is rotatably installed on the lower outer side of the connecting limiting block 205, and the lower end of the limiting support rod 206 can slide out of the interior of the slide frame rod 203.

[0032] During use, the operator rotates the second adjusting threaded ring 202. When the second adjusting threaded ring 202 rotates, it can move the slide frame rod 203 downward in sync. When the slide frame rod 203 moves downward, it will move the connecting limit block 205 and the limit support rod 206 downward in sync. After adjusting to a suitable height, rotate the slide frame rod 203, and then pull the limit support rod 206 out from the inside of the slide frame rod 203. At this time, the limit support rod 206 will slide synchronously with the connecting limit block 205.

[0033] After the limiting support rod 206 slides out of the interior of the sliding frame rod 203, the operation is carried out, so that the lower end of the limiting support rod 206 is perpendicular to the ground. At this time, the lower end of the limiting support rod 206 is inserted into the soil. Since the limiting support rod 206 is relatively long, the stability of the support column 2 is further guaranteed. Compared with the support frame on the market, this support frame achieves the safety of the surveying instrument body 4 through the cooperation of the limiting support rod 206, the connecting limiting block 205, and the second adjusting threaded ring 202.

[0034] An adjustment threaded rod 3 is rotatably mounted on its upper end with a mounting support 301. A mounting base 302 is fixedly mounted on the top of the mounting support 301. An adjustment threaded seat 303 is fixedly mounted inside the mounting support 301. Figure 8 As shown.

[0035] It should be noted that threaded holes are provided at the center positions of the upper and lower ends of the mounting base 302 and the upper and lower ends of the adjusting threaded seat 303. Then, a screw 304 is threadedly mounted from the lower end to the upper end of the adjusting threaded seat 303. The upper end of the screw 304 can rotate to the upper end of the mounting base 302 and its height is higher than that of the mounting base 302. Therefore, the screw 304 can be threadedly connected to the center position of the lower end of the surveying instrument body 4, thereby fixing the surveying instrument body 4.

[0036] Symmetrical sliding mounting plates 5 are rotatably mounted on both sides of the mounting base 302. An arc-shaped protective cover 502 is provided above both symmetrical sliding mounting plates 5. Springs 501 are fixedly installed at the corners of the lower edges of the arc-shaped protective cover 502. The lower edges of the arc-shaped protective cover 502 are slidably mounted inside the adjacent sliding mounting plates 5, while the lower ends of the springs 501 are fixedly mounted to the inner surface of the sliding mounting plate 5. Figure 11 As shown. It should be noted that after the arc-shaped protective cover 502 is rotated and assembled, its fitting end is connected by magnetic attraction to prevent the arc-shaped protective cover 502 from separating.

[0037] During use, the sliding mounting plate 5 rotates synchronously with the arc-shaped protective cover 502. After rotating and fitting together, it can protect the internal surveying instrument body 4, ensuring that the surveying instrument body 4 will not be impacted, thus further guaranteeing the safety of the surveying instrument body 4.

[0038] Then, during the rotation and installation process, the arc-shaped protective cover 502 can stretch along the spring 501 to prevent the arc-shaped protective cover 502 from colliding with one end of the surveying instrument body 4 during rotation and assembly.

[0039] Then, a baffle 6 is rotatably installed on the outside of the arc-shaped protective cover 502. A through-hole 601 is formed on the outer and inner sides of the baffle 6. Four fans 602 are fixedly installed in a circular array at the inner edge of the through-hole 601. Figure 11 As shown.

[0040] It should be noted that the fan 602 uses blade batteries. Because blade batteries are small in size and weight, they do not add weight to the overall structure, thus ensuring power supply to the fan 602 and avoiding adding weight.

[0041] During use, the output shaft of the fan 602 will rotate with the fan blades. At this time, air is drawn in from one side and air is discharged from the other side, thereby achieving the cooling operation of the surveying instrument body 4, avoiding excessive temperature and preventing the surveying instrument body 4 from overheating, as well as avoiding the influence of weather temperature on the surveying instrument body 4.

[0042] Next, a housing 7 is fixedly installed at the inner outer edge of the through slot 601. The housing 7 has a hollow structure inside and a through structure from the outer side to the inner center. Six inclined plates 701 are evenly fixedly installed in a ring array at the inner circumferential edge of the housing 7. An installation ring 703 is fixedly installed inside the six inclined plates 701 to fix and support the inclined plates 701 and prevent vibration inside the inclined plates 701.

[0043] Then, a sliding groove hole 702 is provided on the outer side to the inner side of the inclined plate 701. Then, an arc-shaped opening 704 is opened from the outer circumferential surface to the inside of the outer shell 7. It should be noted that the inner side of the through groove 601 on the outer circumferential surface of the baffle 6 has a structure consistent with the arc-shaped opening 704. Then, an adjusting gear 705 is rotatably installed on the outer side of the baffle 6. The adjusting gear 705 passes through the arc-shaped opening 704 and enters the interior of the outer shell 7.

[0044] A gear ring 706 is rotatably mounted inside the housing 7, and the gear ring 706 and the adjusting gear 705 are in a meshing state.

[0045] Therefore, during use, operators can use the baffle 6 to shield the sun from direct sunlight onto the lens of the surveying instrument body 4. Then, by adjusting the gear 705, the gear ring 706 can be driven to rotate, thereby adjusting the subsequent structure.

[0046] A hexagonal groove 707 is formed on the inner surface of the gear ring 706. Slider blocks 710 are slidably mounted at the inner corners of the six straight sides of the hexagonal groove 707. A sealing plate 708 is fixedly mounted on the inner surface of the slider 710, located on the outer side of the gear ring 706. A sliding post 709 is fixedly mounted at the center of the inner surface of the sealing plate 708. The end of the sliding post 709 away from the sealing plate 708 is slidably mounted inside the sliding groove hole 702. Figure 13 As shown.

[0047] During use, rotating the adjusting gear 705 drives the gear ring 706 to rotate. When the gear ring 706 rotates, it carries the slider 710 to slide inside the hexagonal groove 707. During the sliding process, it can move the sealing plate 708 synchronously. However, during the movement of the sealing plate 708, its sliding post 709 will slide along the path of the sliding groove hole 702, thereby causing the sealing plate 708 to rotate, thus realizing the opening and closing of the through slot hole 601.

[0048] Finally, a secondary seat 8 is fixedly installed on the outer circumferential surface of the upper end of the adjusting threaded rod 3. A U-shaped slide rod 801 is evenly and rotatably mounted in a circular array on the lower end face of the secondary seat 8. A mounting plate 802 is fixedly installed on the outer lower end of the U-shaped slide rod 801. A fastening knob 803 is threadedly mounted on one side of the mounting plate 802 and rotatably mounted inside the U-shaped slide rod 801. Furthermore, an auxiliary support leg 804 is slidably installed inside the U-shaped slide rod 801. One side of the auxiliary support leg 804 can tightly fit against the inner end of the fastening knob 803, thus allowing the auxiliary support leg 804 to be fixed inside the U-shaped slide rod 801, and vice versa, to be in a sliding state. Figure 14 As shown.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-purpose engineering surveying instrument with a protective structure, characterized in that: Includes a mounting base (302), and the upper surface of the mounting base (302) is provided with the surveying instrument body (4); An adjusting threaded rod (3) is provided below the mounting base (302), and a sub-base (8) is fixedly installed on the outer circumferential surface of the adjusting threaded rod (3). The lower end face of the sub-seat (8) is rotatably mounted with a U-shaped slide rod (801) in an annular array, and an mounting plate (802) is fixedly mounted on the outer side of the lower end of the U-shaped slide rod (801). A fastening knob (803) is rotatably mounted on the outer side to the inner side of the mounting plate (802), and an auxiliary support leg (804) is slidably mounted inside the U-shaped slide rod (801). A symmetrical sliding mounting plate (5) is rotatably mounted on the outer side of the mounting base (302); An arc-shaped protective cover (502) is slidably installed on the outer side to the inner side of two adjacent sliding mounting plates (5), and the surveying instrument body (4) is located inside the arc-shaped protective cover (502).

2. The multi-purpose engineering surveying instrument with a protective structure according to claim 1, characterized in that: A symmetrical spring (501) is fixedly installed on the inner ground of the sliding groove mounting plate (5). The upper end of the spring (501) is fixedly connected to the lower end face of the arc-shaped protective cover (502). The lower end of the arc-shaped protective cover (502) is slidably installed inside the sliding groove mounting plate (5). Baffles (6) are rotatably installed at both ends of the arc-shaped protective cover (502). Through slots (601) are opened from the outer side to the inner side of the baffles (6). Fans (602) are evenly fixedly installed in a ring array inside the through slots (601).

3. A multi-purpose engineering surveying instrument with a protective structure according to claim 2, characterized in that: A housing (7) is fixedly installed at the inner edge of the through slot (601). Inclined plates (701) are evenly fixedly installed in a ring array at the inner edge of the housing (7). An installation ring (703) is fixedly installed inside the inclined plates (701). Inclined sliding slots (702) are opened from the outer side to the inner side of the inclined plates (701).

4. A multi-purpose engineering surveying instrument with a protective structure according to claim 3, characterized in that: An arc-shaped opening (704) is provided on the outer circumferential surface of the outer shell (7) to the inside. An adjusting gear (705) is rotatably provided inside the arc-shaped opening (704). The rear end face of the adjusting gear (705) is rotatably mounted on the outer side of the baffle (6) via a cylinder.

5. A multi-purpose engineering surveying instrument with a protective structure according to claim 4, characterized in that: A gear ring (706) is rotatably mounted inside the outer shell (7). A hexagonal groove (707) is provided on the inner side of the gear ring (706). A slider (710) is slidably mounted at the corner of the straight side inside the hexagonal groove (707). A sealing plate (708) is fixedly mounted on the inner side of the slider (710). A sliding column (709) is fixedly mounted at the center of the inner side of the sealing plate (708). The sliding column (709) is slidably mounted inside the sliding groove hole (702).

6. A multi-purpose engineering surveying instrument with a protective structure according to claim 1, characterized in that: The mounting base (302) is fixedly mounted with a mounting support base (301) at its lower end. An adjusting threaded seat (303) is fixedly mounted inside the mounting support base (301). A screw (304) is rotatably mounted from the lower end face to the upper end face of the adjusting threaded seat (303). The upper end of the screw (304) extends to the upper end of the mounting base (302) and is rotatably connected to the lower end of the surveying instrument body (4) by a thread.

7. A multi-purpose engineering surveying instrument with a protective structure according to claim 6, characterized in that: The lower end of the mounting support (301) is rotatably mounted with an adjusting threaded rod (3), and a support column (2) is provided on the outer side of the lower end of the adjusting threaded rod (3). The upper end of the support column (2) is rotatably mounted with a first adjusting threaded ring (201), and the first adjusting threaded ring (201) and the adjusting threaded rod (3) are rotatably connected by threads.

8. A multi-purpose engineering surveying instrument with a protective structure according to claim 7, characterized in that: The outer circumferential surface of the support column (2) is provided with an external thread (207). The outer thread of the support column (2) is rotatably installed with a second adjusting threaded ring (202). The lower end of the second adjusting threaded ring (202) is arranged with a uniformly spaced sliding groove frame rod (203). The inner two sides of the sliding groove frame rod (203) are provided with a U-groove (204). The U-groove (204) is slidably installed with a connecting limit block (205). The lower end of the connecting limit block (205) is rotatably installed with a limit support rod (206).

9. A multi-purpose engineering surveying instrument with a protective structure according to claim 8, characterized in that: A U-shaped seat (1) is provided on the outer side of the lower end of the support column (2). An installation groove tube (102) is fixedly installed on the lower end face of the U-shaped seat (1). An installation groove (103) is opened from the inside of the installation groove tube (102) to the upper end face of the U-shaped seat (1). The lower end of the support column (2) is slidably installed inside the installation groove (103).

10. A multi-purpose engineering surveying instrument with a protective structure according to claim 9, characterized in that: The lower end of the U-shaped seat (1) is provided with a first groove (101) on both sides. A first support seat (105) is slidably installed inside the first groove (101). The U-shaped seat (1) is provided with a U-shaped groove (104) on both sides. A first support rod (106) in a symmetrical state is rotatably installed inside the U-shaped groove (104). A first threaded hole (107) is provided from the lower end of the first support rod (106) to the inside. A first threaded support rod (108) is rotatably installed inside the first threaded hole (107).

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