A portable surveying and mapping device for construction engineering

Abstract

The present invention relates to a portable surveying and mapping device for construction engineering, including a supporting mechanism for supporting a total station, the supporting mechanism including a triangle plate, three extension plates are arranged below the triangle plate, the lower end of the extension plate is fixedly connected with a supporting foot, both sides of the extension plate are slidably connected with a rotating plate, the upper ends of the two rotating plates are rotatably connected with the lower end of the triangle plate, the supporting foot and the rotating plate are clamped by a clamping mechanism, and the rotating plate is provided with a tightening mechanism for tightening the extension plate; a positioning mechanism for positioning the total station, the positioning mechanism including an outer cylinder, a middle cylinder and an inner cylinder, the outer rotation of the middle cylinder is connected with two first threaded rods, and the lower end of the middle cylinder is fixedly installed with a first motor. Compared with the prior art, the present invention has a shorter erection time and a higher calibration accuracy when erecting the total station, and the height of the total station can be compensated according to the current temperature to ensure the accuracy of subsequent measurement results of the total station.

Description

Technical Field

[0001] The invention relates to the field of construction engineering, and in particular to a portable surveying and mapping device for construction engineering. Background Art

[0002] A total station, or total station electronic tachometer, is an instrument that can automatically display necessary observation data such as slant distance, zenith distance (vertical angle), horizontal angle, etc. once observation is made on a side station, and the horizontal distance, elevation difference and coordinates of the point can be obtained almost at the same time. If the data terminal collected by the total station tachometer in the field is connected to a computer or a plotter through a transmission interface, and equipped with data processing software and drawing software, the automation of mapping can be realized. It is widely used in precision engineering measurement or deformation monitoring fields such as large-scale above-ground buildings and underground tunnel construction.

[0003] During the installation process of the total station, the height of the bracket is adjusted manually. After placement, the total station is calibrated using its own laser. The bracket is then moved continuously to place the total station in the exact position. The calibration error is large and the calibration takes a long time. The bracket used to support the total station is mostly made of aluminum alloy window material. Aluminum alloy will produce certain deformation when the temperature changes. In summer, the temperature difference between indoor and outdoor is too large. After the total station is installed, the bracket is exposed to the sun and the temperature difference before and after is too large. At this time, the size of the bracket changes, which will cause the position of the total station to deviate, resulting in inaccurate subsequent measurement results.

[0004] Therefore, based on the above problems, we have invented a portable surveying and mapping device for construction engineering. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a portable surveying and mapping device for construction engineering to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a portable surveying and mapping device for construction engineering, comprising:

[0007] A support mechanism, used for supporting the total station, the support mechanism comprises a triangular plate, three extension plates are arranged below the triangular plate, the lower ends of the extension plates are fixedly connected with support feet, both sides of the extension plates are slidably connected with rotating plates, the upper ends of the two rotating plates are rotatably connected with the lower ends of the triangular plate, the support feet and the rotating plates are clamped by a clamping mechanism, and the rotating plates are provided with a tightening mechanism for tightening the extension plates;

[0008] A positioning mechanism, used for positioning the total station, the positioning mechanism comprises an outer cylinder, a middle cylinder and an inner cylinder, the middle cylinder is rotatably connected with two first threaded rods on the outside, a first motor is fixedly installed on the lower end of the middle cylinder, a driving shaft of the first motor rotates through the middle cylinder and is coaxially fixedly connected with one of the first threaded rods, the two first threaded rods are threadedly penetrated through the outer cylinder, the inner cylinder is rotatably connected with two second threaded rods on the outside, the upper ends of the two second threaded rods are rotatably connected with the triangle plate, the two second threaded rods are threadedly penetrated through the middle cylinder, and the two first threaded rods are transmission-connected with the two second threaded rods via a first transmission mechanism;

[0009] A compensation mechanism is used to compensate for the deformation length of the extension plate and the rotating plate. The compensation mechanism includes a mounting plate arranged above the triangular plate, and three third threaded rods are fixedly connected to the lower end of the mounting plate. The third threaded rods are externally threaded with an adjusting sleeve. The lower ends of the three adjusting sleeves are rotatably connected to the triangular plate, and the three adjusting sleeves are transmission-connected by a second transmission mechanism. A mercury box is fixedly installed on the upper end of the triangular plate, and a skateboard is sealingly and slidably connected to the mercury box. The part of the mercury box located on the left side of the skateboard is filled with mercury, and a rheostat is embedded in the inner wall of the mercury box, and the pointer of the rheostat is embedded in the skateboard.

[0010] Furthermore, the clamping mechanism includes a T-slot arranged at the lower end of the rotating plate, an insert block is inserted in the T-slot, two slots are arranged at the upper end of the insert block, wedge blocks are slidably connected in the two slots, the wedge blocks are fixedly connected to the inner wall of the slot by a spring, and the lower end of the insert block is fixedly connected to the supporting foot.

[0011] Furthermore, the clamping mechanism includes two sliding grooves respectively arranged on opposite side walls of the two rotating plates, and sliders are slidably connected in the two sliding grooves, and the two sliders are fixedly connected to the extension plate. A fourth threaded rod is provided in the two sliding grooves, and the two fourth threaded rods slide through the two rotating plates respectively, and a rotating sleeve is threadedly sleeved on the outside of the two fourth threaded rods. The two rotating sleeves are respectively rotatably connected to the two rotating plates, and the two rotating plates are rotatably connected to a rotating shaft through a bearing seat. The rotating shaft and the two rotating sleeves are transmission-connected by a third transmission mechanism, and one end of the rotating shaft is coaxially fixedly connected to a rotating handle.

[0012] Furthermore, the third transmission mechanism includes a first pulley and a second pulley, the first pulley is coaxially fixedly connected to the rotating shaft, the second pulley is coaxially fixedly connected to the rotating sleeve, and the first pulley and the second pulley are connected via a synchronous belt transmission.

[0013] Further, the first transmission mechanism includes a gear ring rotatably connected to the upper end of the middle cylinder, the first gear is coaxially fixedly connected to the outside of the two first threaded rods, the sliding sleeve is slidably sleeved on the outside of the two second threaded rods, the two sliding sleeves are rotatably connected to the middle cylinder, the second gear is coaxially fixedly connected to the outside of the two sliding sleeves, and the first gear and the second gear are meshingly connected to the gear ring.

[0014] Furthermore, the second transmission mechanism includes three third pulleys, and the three third pulleys are respectively coaxially fixedly connected to the three rotating sleeves, and the three third pulleys are meshed with each other through a transmission belt. The lower end of the triangular plate is fixedly connected to a second motor, and a driving shaft of the second motor rotates through the triangular plate and is coaxially fixedly connected to a driving gear, and the driving gear is meshed with the transmission belt, and the second motor is electrically connected to a rheostat.

[0015] Furthermore, the front ends of the two rotating plates located at the front side are fixedly mounted with first rollers, the front end of the triangular plate is fixedly mounted with a second roller, and the edge of the triangular plate is fixedly mounted with a traction rope.

[0016] Furthermore, binding belts are installed on the two rotating plates located on the front side.

[0017] Furthermore, both upper and lower ends of the wedge-shaped block are provided with smooth inclined surfaces, and the inclined surfaces face toward the end away from the inner side wall of the groove.

[0018] Furthermore, through holes are provided at the centers of the triangular plate and the mounting plate.

[0019] Compared with the prior art, the present invention provides a portable surveying and mapping device for construction engineering, which has the following beneficial effects:

[0020] 1. This portable surveying and mapping device for construction engineering is provided with a supporting mechanism and a positioning mechanism. After a reference point is selected, the two first threaded rods are driven to rotate by a first motor, and the two first threaded rods drive the two second threads to rotate through a gear ring. The two first threaded rods drive the outer cylinder to move downward relative to the middle cylinder, and the two second threaded rods drive the inner cylinder to move upward relative to the middle cylinder until a suitable position is reached. At this time, the outer cylinder is placed on the ground, and a total station is installed on a mounting plate. The position of the outer cylinder is adjusted so that the laser on the total station corresponds to the reference point on the ground. At this time, multiple rotating plates are rotated in turn and three supporting feet are pushed until the three supporting feet are supported and pressed against the ground. Then the inner cylinder and the outer cylinder are adjusted back to their original positions, and the installation of the total station is completed. When installing the total station, no complicated calibration is required, the calibration time is short, and the calibration accuracy is high.

[0021] 2. This portable surveying and mapping device for construction projects is provided with a compensation mechanism. After the total station is erected, when the external temperature gradually rises, mercury pushes the slide plate to move under the action of thermal expansion and contraction. The resistance of the slide plate changes during the movement. At this time, the second motor rotates according to the magnitude of the current. When the current is large, the second motor rotates more circles, and when the current is small, the second motor rotates fewer circles. When the second motor rotates, it drives the driving gear to rotate, and the driving gear drives the transmission belt to rotate. The transmission belt drives the adjusting sleeve to rotate through the third pulley, and the adjusting sleeve drives the third threaded rod to rise and fall. The third threaded rod drives the total station to rise and fall through the mounting plate. The height of the total station can be automatically compensated according to the temperature, so as to avoid excessive errors caused by aluminum alloy deformation of the total station and ensure the accuracy of subsequent measurement results of the total station.

[0022] When the total station is set up in the present invention, the setting up time is short and the calibration accuracy is high. The height of the total station can be compensated according to the current temperature, thereby ensuring that subsequent measurement results of the total station are accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 It is a front structural schematic diagram of the present invention;

[0025] Figure 3 It is a top view of the structure of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the positioning mechanism in the present invention;

[0027] Figure 5 It is a structural perspective view of the positioning mechanism in the present invention;

[0028] Figure 6 for Figure 5 The enlarged view of point A in the middle;

[0029] Figure 7 It is a schematic diagram of the supporting mechanism in the present invention;

[0030] Figure 8 It is a partial enlarged perspective view of the supporting mechanism in the present invention;

[0031] Fig. 9 This is a schematic diagram of the structure of the middle plug-in block.

[0032] In the figure: 1, support mechanism; 2, triangle plate; 3, extension plate; 4, support foot; 5, rotating plate; 6, clamping mechanism; 7, tightening mechanism; 8, positioning mechanism; 9, outer cylinder; 10, middle cylinder; 11, inner cylinder; 12, first threaded rod; 13, first motor; 14, second threaded rod; 15, first transmission mechanism; 16, compensation mechanism; 17, mounting plate; 18, third threaded rod; 19, adjusting sleeve; 20, second transmission mechanism; 21, mercury box; 22, slide plate; 23, through hole; 24, rheostat; 25, T-slot; 26, Insert block; 27, slot; 28, wedge block; 29, spring; 30, slide groove; 31, slider; 32, fourth threaded rod; 33, rotating sleeve; 34, bearing seat; 35, rotating shaft; 36, third transmission mechanism; 37, rotating handle; 38, first pulley; 39, second pulley; 40, gear ring; 41, first gear; 42, sliding sleeve; 43, second gear; 44, third pulley; 45, transmission belt; 46, second motor; 47, driving gear; 48, first roller; 49, second roller; 50, traction rope; 51, binding belt. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, this application proposes a portable surveying and mapping device for construction engineering.

[0035] like Figure 1-9 As shown, a portable surveying and mapping device for construction engineering includes:

[0036] The supporting mechanism 1 is used to support the total station. The supporting mechanism 1 includes a triangular plate 2. Three extension plates 3 are arranged below the triangular plate 2. The lower end of the extension plate 3 is fixedly connected with a supporting foot 4. It should be noted that the lower end of the supporting foot 4 is sharp. Both sides of the extension plate 3 are slidably connected with a rotating plate 5. It is worth mentioning that the front ends of the two rotating plates 5 located on the front side are fixedly installed with a first roller 48, the front end of the triangular plate 2 is fixedly installed with a second roller 49, and the edge of the triangular plate 2 is fixedly installed with a traction rope 50. It should be noted that the position Binding belts 51 are installed on the two rotating plates 5 on the front side. The upper ends of the two rotating plates 5 are rotatably connected to the lower end of the triangular plate 2. The supporting foot 4 and the rotating plate 5 are clamped by a clamping mechanism 6. The clamping mechanism 6 includes a T-slot 25 arranged at the lower end of the rotating plate 5. An insert block 26 is inserted in the T-slot 25. Two slots 27 are arranged at the upper end of the insert block 26. Wedge blocks 28 are slidably connected in the two slots 27. It should be noted that smooth inclined surfaces are arranged at the upper and lower ends of the wedge block 28, and the inclined surface faces the end away from the inner wall of the slot 27.

[0037] In the present invention, the wedge block 28 is fixedly connected to the inner wall of the slot 27 by a spring 29, the lower end of the insert block 26 is fixedly connected to the support foot 4, and a tightening mechanism 7 for tightening the extension plate 3 is provided on the rotating plate 5. It should be noted that the tightening mechanism 7 includes two slide grooves 30 respectively arranged on the opposite side walls of the two rotating plates 5, and the two slide grooves 30 are slidably connected with sliders 31, and the two sliders 31 are fixedly connected to the extension plate 3. The two slide grooves 30 are each provided with a fourth threaded rod 32, and the two fourth threaded rods 32 are respectively slidably penetrated by the two rotating plates 5, and the outer sides of the two fourth threaded rods 32 are both threaded. The sleeve is provided with a rotating sleeve 33, and the two rotating sleeves 33 are respectively rotatably connected with the two rotating plates 5, and the two rotating plates 5 are rotatably connected with a rotating shaft 35 through a bearing seat 34. The rotating shaft 35 and the two rotating sleeves 33 are connected by a third transmission mechanism 36. Further, the third transmission mechanism 36 includes a first pulley 38 and a second pulley 39. The first pulley 38 is coaxially fixedly connected with the rotating shaft 35, and the second pulley 39 is coaxially fixedly connected with the rotating sleeve 33. The first pulley 38 and the second pulley 39 are connected by a synchronous belt transmission, and one end of the rotating shaft 35 is coaxially fixedly connected with a rotating handle 37;

[0038] Through the above technical features, after the total station is positioned, the multiple rotating plates 5 are rotated in sequence and the three supporting feet 4 are pushed until the three supporting feet 4 are supported and pressed against the ground. At this time, the rotating handle 37 is rotated in sequence, the rotating handle 37 drives the rotating shaft 35 to rotate, the rotating shaft 35 drives the two rotating sleeves 33 to rotate, and the two rotating sleeves 33 drive the two fourth threaded rods 32 to move relative to each other until the fourth threaded rod 32 presses and fixes the slider 31. At this time, the inner cylinder 11 and the outer cylinder 9 are adjusted back to their original positions to complete the support and erection of the total station.

[0039] In order to accurately set up the total station, a positioning mechanism 8 is set up to locate the total station. The positioning mechanism 8 includes an outer cylinder 9, a middle cylinder 10 and an inner cylinder 11. It should be noted that the outer cylinder 9 is made of a transparent acrylic plate, and the middle cylinder 10 is rotatably connected to two first threaded rods 12 on the outside. A first motor 13 is fixedly installed on the lower end of the middle cylinder 10. The driving shaft of the first motor 13 rotates through the middle cylinder 10 and is coaxially fixedly connected to one of the first threaded rods 12. The two first threaded rods 12 are threadedly penetrated through the outer cylinder 9. The inner cylinder 11 is rotatably connected to two second threaded rods 14 on the outside. The upper ends of the two second threaded rods 14 are both connected to the triangle. The plate 2 is rotatably connected, the two second threaded rods 14 are threadedly penetrated through the middle tube 10, and the two first threaded rods 12 and the two second threaded rods 14 are transmission-connected through the first transmission mechanism 15. It should be noted that the first transmission mechanism 15 includes a gear ring 40 rotatably connected to the upper end of the middle tube 10, the two first threaded rods 12 are coaxially fixedly connected to the first gear 41, the two second threaded rods 14 are slidably sleeved with a sliding sleeve 42, the two sliding sleeves 42 are rotatably connected to the middle tube 10, the two sliding sleeves 42 are coaxially fixedly connected to the second gear 43, and the first gear 41 and the second gear 43 are meshed with the gear ring 40;

[0040] Through the above technical features, after selecting the reference point, the two first threaded rods 12 are driven to rotate by the first motor 13, and the two first threaded rods 12 drive the two second threaded rods 14 to rotate through the gear ring 40. The two first threaded rods 12 drive the outer cylinder 9 to move downward relative to the middle cylinder 10, and the two second threaded rods 14 drive the inner cylinder 11 to move upward relative to the middle cylinder 10 until it reaches a suitable position. At this time, the outer cylinder 9 is placed on the ground, and the total station is installed on the mounting plate 17. The position of the outer cylinder 9 is adjusted so that the laser on the total station corresponds to the reference point on the ground, thereby completing the precise positioning of the total station before support.

[0041] In order to compensate for the elongation of the aluminum alloy due to temperature changes, a compensation mechanism 16 is provided to compensate for the deformation length of the extension plate 3 and the rotating plate 5. The compensation mechanism 16 includes a mounting plate 17 arranged above the triangular plate 2. Furthermore, a through hole 23 is penetrated at the center of the triangular plate 2 and the mounting plate 17. Three third threaded rods 18 are fixedly connected to the lower end of the mounting plate 17. The third threaded rod 18 is externally threaded with an adjusting sleeve 19. The lower ends of the three adjusting sleeves 19 are rotatably connected to the triangular plate 2. The three adjusting sleeves 19 are connected to each other through a second transmission mechanism 20. Furthermore, the second transmission mechanism 20 includes three third pulleys 44. The three third pulleys 44 are coaxially and fixedly connected to the three rotating sleeves 33, respectively. The three third pulleys 44 are meshed and transmitted by a transmission belt 45.

[0042] In the present invention, the lower end of the triangle plate 2 is fixedly connected with a second motor 46, the driving shaft of the second motor 46 rotates and passes through the triangle plate 2 and is coaxially fixedly connected with a driving gear 47, the driving gear 47 is meshed and connected with the transmission belt 45, the second motor 46 is electrically connected with the rheostat 24, and a mercury box 21 is fixedly installed on the upper end of the triangle plate 2, and a slide plate 22 is sealed and slidably connected inside the mercury box 21, and the part of the mercury box 21 located on the left side of the slide plate 22 is filled with mercury. It should be noted that the physical properties of mercury will change significantly with the change of temperature. Mercury is a liquid that expands with heat and contracts with cold. When the temperature rises, the volume of mercury will expand and the density will decrease; conversely, when the temperature drops, the volume of mercury will shrink and the density will increase. This change is called thermal expansion and contraction phenomenon. A rheostat 24 is embedded in the inner wall of the mercury box 21, and the pointer of the rheostat 24 is embedded in the slide plate 22.

[0043] Through the above technical features, after the total station is set up, when the external temperature gradually increases, mercury pushes the slide plate 22 to move under the action of thermal expansion and contraction. The resistance of the slide plate 22 changes during the movement. At this time, the second motor 46 rotates according to the magnitude of the current. When the current is large, the second motor 46 rotates more circles. When the current is small, the second motor 46 rotates fewer circles. When the second motor 46 rotates, it drives the driving gear 47 to rotate, and the driving gear 47 drives the transmission belt 45 to rotate. The transmission belt 45 drives the adjusting sleeve 19 to rotate through the third pulley 44. The adjusting sleeve 19 drives the third threaded rod 18 to rise and fall. The third threaded rod 18 drives the total station to rise and fall through the mounting plate 17, so that the height of the total station can be automatically compensated according to the temperature.

[0044] Working principle:

[0045] Positioning the total station: After selecting the reference point, the first motor 13 drives the two first threaded rods 12 to rotate, and the two first threaded rods 12 drive the two second threaded rods 14 to rotate through the gear ring 40. The two first threaded rods 12 drive the outer cylinder 9 to move downward relative to the middle cylinder 10, and the two second threaded rods 14 drive the inner cylinder 11 to move upward relative to the middle cylinder 10 until it reaches a suitable position. At this time, the outer cylinder 9 is placed on the ground, and the total station is installed on the mounting plate 17. The position of the outer cylinder is adjusted so that the laser on the total station corresponds to the reference point on the ground, and the precise positioning of the total station before support can be completed;

[0046] For the installation of the total station: after the positioning of the total station is completed, the plurality of rotating plates 5 are rotated in sequence and the three supporting feet 4 are pushed until the three supporting feet 4 are supported and pressed against the ground, at which time the rotating handle 37 is rotated in sequence, the rotating handle 37 drives the rotating shaft 35 to rotate, the rotating shaft 35 drives the two rotating sleeves 33 to rotate, and the two rotating sleeves 33 drive the two fourth threaded rods 32 to move relative to each other until the fourth threaded rod 32 presses and fixes the slider 31, at which time the inner cylinder 11 and the outer cylinder 9 are adjusted back to their original positions, and the support and installation of the total station can be completed;

[0047] Height compensation for the total station: After the total station is set up, when the external temperature changes, mercury pushes the slide plate 22 to move due to thermal expansion and contraction. The resistance of the slide plate 22 changes during the movement. At this time, the second motor 46 rotates according to the magnitude of the current. When the current is large, the second motor 46 rotates more circles. When the current is small, the second motor 46 rotates fewer circles. When the second motor 46 rotates, it drives the driving gear 47 to rotate, and the driving gear 47 drives the transmission belt 45 to rotate. The transmission belt 45 drives the adjusting sleeve 19 to rotate through the third pulley 44. The adjusting sleeve 19 drives the third threaded rod 18 to rise and fall. The third threaded rod 18 drives the total station to rise and fall through the mounting plate 17, so that the height of the total station can be automatically compensated according to the temperature.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable surveying and mapping device for construction engineering, characterized in that: include, A support mechanism (1) for supporting a total station, the support mechanism (1) comprising a triangular plate (2), three extension plates (3) being provided below the triangular plate (2), the lower ends of the extension plates (3) being fixedly connected to support feet (4), both sides of the extension plates (3) being slidably connected to rotating plates (5), the upper ends of the two rotating plates (5) being rotatably connected to the lower ends of the triangular plate (2), the support feet (4) and the rotating plates (5) being clamped together by a clamping mechanism (6), and the rotating plates (5) being provided with a clamping mechanism (7) for clamping the extension plates (3); A positioning mechanism (8) is used for positioning a total station, the positioning mechanism (8) comprising an outer cylinder (9), a middle cylinder (10) and an inner cylinder (11); the middle cylinder (10) is externally rotatably connected to two first threaded rods (12); a first motor (13) is fixedly mounted on the lower end of the middle cylinder (10); a drive shaft of the first motor (13) rotatably penetrates the middle cylinder (10) and is coaxially fixedly connected to one of the first threaded rods (12); the two first threaded rods (12) are threadedly penetrated through the outer cylinder (9); the inner cylinder (11) is externally rotatably connected to two second threaded rods (14); the upper ends of the two second threaded rods (14) are both rotatably connected to a triangular plate (2); the two second threaded rods (14) are threadedly penetrated through the middle cylinder (10); the two first threaded rods (12) and the two second threaded rods (14) are transmission-connected via a first transmission mechanism (15); A compensation mechanism (16) is used to compensate for the deformation length of the extension plate (3) and the rotating plate (5), the compensation mechanism (16) comprising a mounting plate (17) arranged above the triangular plate (2), the lower end of the mounting plate (17) being fixedly connected to three third threaded rods (18), the third threaded rods (18) being externally threadedly sleeved with adjustment sleeves (19), the lower ends of the three adjustment sleeves (19) being rotationally connected to the triangular plate (2), the three adjustment sleeves (19) being transmission-connected via a second transmission mechanism (20), the second transmission mechanism (20) comprising three third pulleys (44), the three third pulleys (44) being coaxially fixedly connected to the three rotating sleeves (33), the three third pulleys (44) The transmission belt (45) is meshed and driven between the two. The lower end of the triangle plate (2) is fixedly connected to a second motor (46). The drive shaft of the second motor (46) rotates and passes through the triangle plate (2) and is coaxially fixedly connected to a drive gear (47). The drive gear (47) is meshed and connected to the transmission belt (45). The second motor (46) is electrically connected to a rheostat (24). A mercury box (21) is fixedly installed on the upper end of the triangle plate (2). A slide plate (22) is sealed and slidably connected inside the mercury box (21). The part of the mercury box (21) located on the left side of the slide plate (22) is filled with mercury. A rheostat (24) is embedded in the inner wall of the mercury box (21). The pointer of the rheostat (24) is embedded in the slide plate (22).

2. A portable construction engineering surveying and mapping device according to claim 1, characterized in that: The clamping mechanism (6) comprises a T-shaped slot (25) arranged at the lower end of the rotating plate (5), an insert block (26) being inserted in the T-shaped slot (25), two slots (27) being arranged at the upper end of the insert block (26), wedge blocks (28) being slidably connected in both of the two slots (27), the wedge blocks (28) being fixedly connected to the inner wall of the slot (27) by a spring (29), and the lower end of the insert block (26) being fixedly connected to the supporting foot (4).

3. A portable construction engineering surveying and mapping device according to claim 1, characterized in that: The clamping mechanism (7) comprises two slide grooves (30) respectively arranged on opposite side walls of the two rotating plates (5), the two slide grooves (30) are slidably connected with a slider (31), the two sliders (31) are fixedly connected to the extension plate (3), the two slide grooves (30) are respectively provided with a fourth threaded rod (32), the two fourth threaded rods (32) are respectively slidably penetrated by the two rotating plates (5), the outer surfaces of the two fourth threaded rods (32) are respectively threadedly sleeved with a rotating sleeve (33), the two rotating sleeves (33) are respectively rotatably connected to the two rotating plates (5), the two rotating plates (5) are rotatably connected with a rotating shaft (35) through a bearing seat (34), the rotating shaft (35) and the two rotating sleeves (33) are transmission-connected via a third transmission mechanism (36), and one end of the rotating shaft (35) is coaxially and fixedly connected with a rotating handle (37).

4. A portable construction engineering surveying and mapping device according to claim 3, characterized in that: The third transmission mechanism (36) comprises a first pulley (38) and a second pulley (39); the first pulley (38) is coaxially fixedly connected to the rotating shaft (35); the second pulley (39) is coaxially fixedly connected to the rotating sleeve (33); and the first pulley (38) and the second pulley (39) are connected via a synchronous belt transmission.

5. A portable construction engineering surveying and mapping device according to claim 1, characterized in that: The first transmission mechanism (15) comprises a gear ring (40) rotatably connected to the upper end of the middle cylinder (10); the first gear (41) is coaxially fixedly connected to the outside of the two first threaded rods (12); the second threaded rods (14) are slidably sleeved with a sliding sleeve (42); the two sliding sleeves (42) are rotatably connected to the middle cylinder (10); the second gear (43) is coaxially fixedly connected to the outside of the two sliding sleeves (42); and the first gear (41) and the second gear (43) are meshingly connected to the gear ring (40).

6. A portable construction engineering surveying and mapping device according to claim 1, characterized in that: The front ends of the two rotating plates (5) located at the front side are both fixedly mounted with first rollers (48), the front end of the triangular plate (2) is fixedly mounted with a second roller (49), and the edge of the triangular plate (2) is fixedly mounted with a traction rope (50).

7. A portable construction engineering surveying and mapping device according to claim 1, characterized in that: Binding belts (51) are installed on the two rotating plates (5) located at the front side.

8. A portable construction engineering surveying and mapping device according to claim 2, characterized in that: The wedge-shaped block (28) is provided with smooth inclined surfaces at both the upper and lower ends, and the inclined surfaces face toward the end away from the inner side wall of the groove (27).

9. A portable construction engineering surveying and mapping device according to claim 3, characterized in that: Through holes (23) are provided at the centres of the triangular plate (2) and the mounting plate (17).

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