Automatic folding and unfolding underground total station support structure and folding and unfolding method thereof

Abstract

The invention relates to an automatic folding and unfolding underground total station support structure and a folding and unfolding method thereof.The automatic folding and unfolding underground total station support structure comprises a disc body and a plurality of supporting arm sets arranged at the bottom of the disc body, and the multiple supporting arm sets are distributed at the bottom of the disc body along the circumference at equal intervals; the multiple supporting arm sets are connected with an expanding and supporting mechanism installed on the disc body. The upper cover is movably arranged on the disc body, the upper cover is matched with the disc body and used for bearing a measuring instrument, and the upper cover is connected with a height regulation and control mechanism arranged on the disc body; during use, a worker only needs to control the expanding and supporting mechanism, the expanding and supporting mechanism can drive the multiple supporting arm sets to synchronously deflect, movement of the multiple supporting arm sets is made to be synchronous, and the problem that due to independent arrangement, the overall supporting effect is not coordinated enough, and then the accuracy of underground coal mine measurement cannot be effectively guaranteed is solved.

Description

Technical Field

[0001] The invention relates to an automatically retractable and deployable downhole total station support structure and a retractable and deployable method thereof. Background Art

[0002] The total station is a high-tech measuring instrument that integrates optics, mechanics and electronics. It combines electronic angle measurement, photoelectric distance measurement and microprocessor technology, and can simultaneously complete functions such as angle measurement, distance measurement, data processing and storage.

[0003] When using a total station for underground observation in a coal mine, a special bracket is required to support the instrument. The main function of the bracket is to ensure that the total station remains level during the underground measurement process in the coal mine, thereby improving the accuracy of the measurement results.

[0004] The existing bracket is generally a tripod, and each support arm is set at a fixed length. When in use, the operator needs to move each support arm outward to tilt the support arm to facilitate supporting the instrument. After the observation operation is completed, each support arm needs to be moved inward to reset. The use is relatively complicated. In addition, since each support arm is set up separately, when one of the support arms deviates, it will cause the instrument to be unstable, and the accuracy of underground measurement in the coal mine cannot be effectively guaranteed. Summary of the invention

[0005] The object of the present invention is to provide an automatically retractable and deployable downhole total station support structure and a retractable and deployable method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: An automatically retractable downhole total station support structure comprises a disc body and a plurality of support arm groups arranged at the bottom of the disc body, wherein the plurality of support arm groups are equidistantly distributed along the circumference of the bottom of the disc body; An upper cover is movably disposed on the disk body, and the upper cover is adapted to the disk body and is used to receive the measuring instrument. The upper cover is connected to a height adjustment mechanism disposed on the disk body, and the height adjustment mechanism can drive the upper cover to rise and fall on the disk body to change the height of the measuring instrument; The expansion mechanism is installed on the disk body and connected to the multiple groups of support arm groups. The expansion mechanism can drive the multiple groups of support arm groups to perform synchronous deflection actions.

[0007] As a further solution of the present invention: the support arm group includes a first arm rotatably mounted on the bottom of the disk body and a second arm slidably fitted with the first arm, the first arm is connected to the expansion mechanism, and a telescopic limit assembly is provided between the first arm and the second arm.

[0008] As a further solution of the present invention: the telescopic limit assembly includes a first clamping block arranged at one end of the first arm away from the disc body and two second clamping blocks movably arranged on the second arm, the first clamping block cooperates with the second clamping block, and the cross-sections of the two are arranged in an isosceles triangle, and the two second clamping blocks are respectively connected to a group of elastic parts installed on the second arm.

[0009] As a further solution of the present invention: lugs are fixed on both sides of the second support arm, and the elastic member includes guide columns slidably connected to the two lugs and a cylindrical spring sleeved on the outer circumference of the guide column, one end of the cylindrical spring is connected to the lug, and the other end is connected to the boss arranged at the head end of the guide column, and the second clamping block is arranged between the tail ends of the two guide columns.

[0010] As a further solution of the present invention: the expansion mechanism includes a first threaded driving member installed on the disk body and a plurality of follower components connected to the first threaded driving member, and the plurality of follower components are respectively connected to a plurality of the first arms and can drive the first arms to perform a deflection action.

[0011] As a further solution of the present invention: the first threaded driving member includes a first screw rod rotating at the center of the disk body and a first threaded sleeve sleeved on the first screw rod and threadedly connected to the first screw rod, and a plurality of groups of follower assemblies are equidistantly distributed along the circumference of the first threaded sleeve; The first screw is connected to a transverse shaft rotatably mounted on the disc body through a bevel gear set, and one end of the transverse shaft away from the first screw extends to the outside of the disc body and is fixedly connected to a first rotating wheel.

[0012] As a further solution of the present invention: the follower assembly includes a cross arm arranged on the outer wall of the first threaded sleeve and a telescopic arm slidably sleeved with the cross arm, a slider is slidably arranged on the first arm, and one end of the telescopic arm away from the first threaded sleeve is hinged to the slider; Among them, a column is arranged at one end of the telescopic arm close to the first threaded sleeve, and a strip-shaped through groove is arranged on the cross arm for the movement of the column. A limiting plate is also arranged at the bottom of the disk body, and an inclined groove body adapted to the column is arranged on the limiting plate. The column passes through the inclined groove body and is slidably connected with the limiting plate.

[0013] As a further solution of the present invention: the height adjustment mechanism includes a power assembly installed on the disk body and multiple groups of second threaded driving members connected to the power assembly, the second threaded driving members include a second screw rod rotatably installed on the disk body and a second threaded sleeve sleeved on the second screw rod and threadedly connected to the second screw rod, the second threaded sleeve is fixedly connected to a push rod slidably arranged on the disk body, the end of the push rod away from the second threaded sleeve is fixed to the upper cover, and the second screw rod is provided with a gear connected to the power assembly.

[0014] As a further solution of the present invention: the power assembly includes a bevel gear ring rotatably mounted in the disk body, a driving wheel rotatably mounted on the disk body and meshing with the bevel gear ring, and a second rotating wheel coaxially mounted with the driving wheel, and the inner wall of the bevel gear ring is provided with teeth meshing with the gear.

[0015] A method for retracting and deploying the automatically retractable downhole total station support structure; When folding, the height control mechanism is controlled to drive the upper cover to descend until the upper cover is docked with the plate body, and then the expansion mechanism is controlled to drive the multiple support arm groups to perform synchronous deflection actions until the multiple support arm groups are switched from the inclined state to the vertical state, and then the support arm groups are retracted; When unfolding, the retracted arm group is extended, and the expansion mechanism is controlled to drive multiple groups of support arms to switch from a vertical state to an inclined state. After the placement of the measuring instrument is completed, the height of the upper cover is adjusted through the height control mechanism.

[0016] Compared with the prior art, the present invention has the following beneficial effects: An expansion mechanism is arranged on the disk body, and the expansion mechanism is connected with multiple groups of support arm groups. The operator only needs to control the expansion mechanism to make the expansion mechanism drive multiple groups of support arm groups to deflect synchronously, so that the movements of multiple groups of support arm groups are synchronized, thereby avoiding the problem that the overall support effect is not coordinated due to the separate setting, and then causing the accuracy of underground coal mine measurement cannot be effectively guaranteed; Secondly, each support arm group includes a first support arm and a second support arm, and the first support arm and the second support arm are slidably sleeved. When not in use, the first support arm and the second support arm can be folded together, which reduces the floor space and facilitates the actual transportation of the support. In addition, the disc body is provided with a movable upper cover. When in use, the height of the upper cover can be adjusted through the height control mechanism according to different operators, thereby improving the practicality of the bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a structural schematic diagram of an embodiment of an automatically retractable and unfoldable downhole total station support structure.

[0018] Figure 2 The present invention is a schematic structural diagram of another angle of an embodiment of an automatically retractable and unfoldable downhole total station support structure.

[0019] Figure 3 The present invention is a front view of an embodiment of an automatically retractable and unfoldable downhole total station support structure.

[0020] Figure 4 The figure is a top view of an embodiment of an automatically retractable and unfoldable downhole total station support structure.

[0021] Figure 5 for Figure 1 A magnified view of the structure at center.

[0022] Figure 6 for Figure 2 A magnified view of the structure at point B.

[0023] Figure 7 The figure is a schematic diagram of the structure inside the disk body in an embodiment of an automatically retractable and unfoldable downhole total station support structure.

[0024] Figure 8 The present invention is a schematic structural diagram of a height control mechanism in an embodiment of an automatically retractable and extendable downhole total station support structure.

[0025] Fig. 9 It is a structural explosion diagram of the expansion mechanism in an embodiment of an automatically retractable and unfoldable underground total station support structure.

[0026] Fig.10 The present invention is a schematic diagram of the connection relationship between the first support arm and the second support arm in an embodiment of an automatically retractable and extendable downhole total station support structure.

[0027] In the figure: 1, first arm; 2, second arm; 3, lug; 4, first clamping block; 5, second clamping block; 6, guide column; 7, boss; 8, cylindrical spring; 9, first rotating wheel; 10, second rotating wheel; 11, horizontal axis; 12, bevel gear set; 13, first screw rod; 14, first threaded sleeve; 15, slider; 16, cross arm; 1601, strip through groove; 17, telescopic arm; 18, column; 19, driving wheel; 20, bevel gear ring; 21, disk body; 22, upper cover; 23, gear; 24, second screw rod; 25, second threaded sleeve; 26, push rod; 27, limit plate; 2701, inclined trough body. DETAILED DESCRIPTION

[0028] 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.

[0029] In addition, when an element in the present invention is referred to as being "disposed on" or "disposed on" another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0030] See also Figure 1-Figure 10 In an embodiment of the present invention, an automatically retractable downhole total station support structure includes a disk body 21 and a plurality of support arm groups arranged at the bottom of the disk body 21, wherein the plurality of support arm groups are equidistantly distributed along the circumference at the bottom of the disk body 21; The automatically retractable downhole total station support structure also includes: An upper cover 22 is movably disposed on the disk body 21, and the upper cover 22 is adapted to the disk body 21 and is used to receive the measuring instrument. The upper cover 22 is connected to a height adjustment mechanism disposed on the disk body 21, and the height adjustment mechanism can drive the upper cover 22 to rise and fall on the disk body 21 to change the height of the measuring instrument; The expansion mechanism is installed on the disk body 21 and connected to the multiple groups of support arm groups. The expansion mechanism can drive the multiple groups of support arm groups to perform synchronous deflection actions.

[0031] Furthermore, in actual use, the disk body 21 is supported by multiple groups of the support arm groups, and by controlling the expansion mechanism, the expansion mechanism drives the multiple groups of the support arm groups to switch from a vertical state to an inclined state, thereby ensuring the stability of the disk body 21 supported by the multiple groups of support arms. During operation, the measuring instrument is placed on the upper cover 22. According to the user's usage requirements, the upper cover 22 can be driven to rise and fall on the disk body 21 by controlling the height adjustment mechanism, thereby realizing the height adjustment function of the measuring instrument, so that the height of the measuring instrument is moderate and the comfort during observation is ensured.

[0032] Please refer again Figure 5 and Fig.10The support arm group includes a first arm 1 rotatably mounted at the bottom of the disk body 21 and a second arm 2 slidably fitted with the first arm 1. The first arm 1 is connected to the expansion mechanism, and a telescopic limit assembly is provided between the first arm 1 and the second arm 2. The telescopic limit assembly includes a first clamping block 4 provided at one end of the first arm 1 away from the disk body 21 and two second clamping blocks 5 movably provided on the second arm 2. The first clamping block 4 cooperates with the second clamping block 5, and the cross-sections of the two are both isosceles triangles. The two second clamping blocks 5 are respectively connected to a group of elastic members installed on the second arm 2. Lugs 3 are fixedly provided on both sides of the second arm 2. The elastic member includes a guide column 6 slidably connected to the two lugs 3 and a cylindrical spring 8 sleeved on the outer periphery of the guide column 6. One end of the cylindrical spring 8 is connected to the lug 3, and the other end is connected to a boss 7 provided at the head end of the guide column 6. The second clamping block 5 is provided between the tail ends of the two guide columns 6.

[0033] Specifically, after the underground measurement work in the coal mine is completed, the expansion mechanism is first controlled to drive the first arms 1 and the second arms 2 to deflect from the inclined state to the vertical state. Subsequently, the upper cover 22 and the disk body 21 are pressed downward, and the first arm 1 slides and shrinks toward the inside of the second arm 2. During this process, the first clamping block 4 first cooperates with the second clamping block 5 located above the second arm 2 (specifically, the inclined surfaces on the two are slidably matched), causing the second clamping block 5 to give way. When the first clamping block 4 reaches the end of the stroke, it will cooperate with the second clamping block 5 located below the second arm 2. The first clamping block 4 eventually reaches below the second clamping block 5, and under the elastic force of the columnar spring 8, the inclined surfaces of the two are tightly fitted, thereby achieving a certain locking effect. Therefore, the support part of the bracket is a telescopic design. After the operation is completed, the first arm 1 can be retracted into the second arm 2, which reduces the space occupied by the bracket and facilitates transportation.

[0034] Please refer again Figure 6 , Figure 7 as well as Fig. 9 The expansion mechanism includes a first threaded drive mounted on the disk body 21 and a plurality of follower assemblies connected to the first threaded drive, and the plurality of follower assemblies are respectively connected to a plurality of first arms 1 and can drive the first arms 1 to perform a deflection action. The first threaded drive includes a first screw rod 13 rotating at the center of the disk body 21 and a first threaded sleeve 14 sleeved on the first screw rod 13 and threadedly connected to the first screw rod 13, and the plurality of follower assemblies are equidistantly distributed along the circumference of the outer circumference of the first threaded sleeve 14; The first screw rod 13 is connected to the transverse shaft 11 rotatably mounted on the disc body 21 through a bevel gear set 12 , and one end of the transverse shaft 11 away from the first screw rod 13 extends to the outside of the disc body 21 and is fixedly connected to the first rotating wheel 9 .

[0035] Specifically, the bevel gear set 12 includes a first bevel gear installed on the end of the transverse shaft 11 away from the first rotating wheel 9 and a second bevel gear installed on the first screw rod 13 , and the second bevel gear meshes with the first bevel gear.

[0036] The follower assembly includes a cross arm 16 disposed on the outer wall of the first threaded sleeve 14 and a telescopic arm 17 slidably fitted with the cross arm 16. A slider 15 is slidably provided on the first support arm 1, and one end of the telescopic arm 17 away from the first threaded sleeve 14 is hinged to the slider 15. Among them, a column 18 is provided at one end of the telescopic arm 17 close to the first threaded sleeve 14, and a strip-shaped through groove 1601 for the movement of the column 18 is provided on the cross arm 16. A limiting plate 27 is also provided at the bottom of the disk body 21, and an inclined groove 2701 adapted to the column 18 is provided on the limiting plate 27. The column 18 passes through the inclined groove 2701 and is slidably connected with the limiting plate 27.

[0037] When in use, when it is necessary to switch the plurality of first supporting arms 1 and the second supporting arms 2 from a vertical state to an inclined state to stably support the measuring instrument, the staff can rotate the horizontal axis 11 through the first rotating wheel 9, and then the horizontal axis 11 drives the first screw rod 13 to rotate through the bevel gear set 12, and the first threaded sleeve 14 and the first screw rod 13 are threadedly matched to drive the horizontal arm 16 and the telescopic arm 17 to move downward; During the downward movement of the cross arm 16 and the telescopic arm 17, the column 18 will slide with the limit plate 27 through the inclined slot 2701, so that the telescopic arm 17 extends toward the outside of the cross arm 16 and rotates relative to the slider 15, and the slider 15 drives the first support arm 1 and the second support arm 2 to swing toward the outside of the disk body 21 synchronously; Attach Figure 1 For example, in the bracket structure, the support arm groups are provided with three groups. Therefore, after the first arm 1 and the second arm 2 are deflected and opened, a support effect with good stability and balance can be formed, avoiding the problem that the bracket is disturbed or vibrated during operation, which makes it inconvenient to carry out observation operations.

[0038] Please refer again Figure 7 and Figure 8The height control mechanism includes a power assembly mounted on the disk body 21 and a plurality of second threaded driving members connected to the power assembly, wherein the second threaded driving member includes a second screw rod 24 rotatably mounted on the disk body 21 and a second threaded sleeve 25 sleeved on the second screw rod 24 and threadedly connected to the second screw rod 24, the second threaded sleeve 25 is fixedly connected to a push rod 26 slidably mounted on the disk body 21, and one end of the push rod 26 away from the second threaded sleeve 25 is fixed to the upper cover 22, and a gear 23 connected to the power assembly is provided on the second screw rod 24. The power assembly includes a bevel gear ring 20 rotatably mounted in the disk body 21, a driving wheel 19 rotatably mounted on the disk body 21 and meshing with the bevel gear ring 20, and a second rotating wheel 10 coaxially mounted with the driving wheel 19, and teeth meshing with the gear 23 are provided on the inner wall of the bevel gear ring 20.

[0039] Since different operators have different heights, different operators have different optimal heights for the measuring instruments placed on the upper cover 22 when making observations. At this time, the operator can rotate the driving wheel 19 through the second rotating wheel 10, so that the driving wheel 19 drives the bevel gear ring 20 to rotate, and the teeth on the bevel gear ring 20 drive the second screw rod 24 to rotate through the gear 23, and then, the second threaded sleeve 25 is threadedly matched with the second screw rod 24, and the second threaded sleeve 25 drives the push rod 26 to lift the upper cover 22, so as to adjust the height of the upper cover 22, which is convenient for different operators to use.

[0040] As another embodiment of the present invention, a method for folding and unfolding the automatically foldable and unfoldable downhole total station support structure is also proposed; When folding, the height control mechanism is controlled to drive the upper cover 22 to descend until the upper cover 22 is docked with the plate body 21, and then the expansion mechanism is controlled to drive the multiple support arm groups to perform synchronous deflection actions until the multiple support arm groups are switched from the inclined state to the vertical state, and then the support arm groups are retracted; When unfolding, the retracted arm group is extended, and the expansion mechanism is controlled to drive the multiple support arm groups to switch from a vertical state to an inclined state. After the placement of the measuring instrument is completed, the height of the upper cover 22 is adjusted through the height control mechanism.

[0041] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An automatically retractable downhole total station support structure, comprising a disc (21) and a plurality of support arm groups arranged at the bottom of the disc (21), wherein the plurality of support arm groups are equidistantly distributed along the circumference of the bottom of the disc (21); It is characterized in that Also includes: an upper cover (22) movably disposed on the disk body (21), the upper cover (22) being adapted to the disk body (21) and being used to receive a measuring instrument, the upper cover (22) being connected to a height adjustment mechanism disposed on the disk body (21), the height adjustment mechanism being capable of driving the upper cover (22) to rise and fall on the disk body (21) so as to change the height of the measuring instrument; The expansion mechanism is installed on the disk body (21) and connected to the multiple groups of support arm groups. The expansion mechanism can drive the multiple groups of support arm groups to perform synchronous deflection actions.

2. The automatic retractable downhole total station support structure according to claim 1, characterized in that: The support arm assembly comprises a first support arm (1) rotatably mounted on the bottom of the disk body (21) and a second support arm (2) slidably fitted with the first support arm (1); the first support arm (1) is connected to the expansion mechanism, and a telescopic limit assembly is provided between the first support arm (1) and the second support arm (2).

3. The automatic retractable downhole total station support structure according to claim 2, characterized in that: The telescopic limit assembly comprises a first clamping block (4) arranged at one end of the first arm (1) away from the disc body (21) and two second clamping blocks (5) movably arranged on the second arm (2), the first clamping block (4) cooperates with the second clamping block (5), and the cross-sections of the two are both isosceles triangles, and the two second clamping blocks (5) are respectively connected to a group of elastic members installed on the second arm (2).

4. The automatically retractable and deployable downhole total station support structure according to claim 3, characterized in that: Lugs (3) are fixedly provided on both sides of the second support arm (2), the elastic member comprises guide posts (6) respectively slidably connected to the two lugs (3) and a columnar spring (8) sleeved on the outer circumference of the guide post (6), one end of the columnar spring (8) is connected to the lug (3), and the other end is connected to a boss (7) arranged at the head end of the guide post (6), and the second clamping block (5) is arranged between the tail ends of the two guide posts (6).

5. The automatically retractable and deployable downhole total station support structure according to claim 2, characterized in that: The expansion mechanism comprises a first threaded drive member mounted on the disk body (21) and a plurality of follower assemblies connected to the first threaded drive member, wherein the plurality of follower assemblies are respectively connected to a plurality of first support arms (1) and are capable of driving the first support arms (1) to perform a deflection action.

6. The automatically retractable and deployable downhole total station support structure according to claim 5, characterized in that: The first threaded drive member comprises a first screw rod (13) rotating at the center of the disk body (21) and a first threaded sleeve (14) sleeved on the first screw rod (13) and threadedly connected to the first screw rod (13), and a plurality of groups of follower assemblies are equidistantly distributed along the circumference of the first threaded sleeve (14); The first screw rod (13) is connected to a transverse shaft (11) rotatably mounted on the disc body (21) via a bevel gear set (12), and one end of the transverse shaft (11) away from the first screw rod (13) extends to the outside of the disc body (21) and is fixedly connected to a first rotating wheel (9).

7. The automatically retractable and deployable downhole total station support structure according to claim 6, characterized in that: The follower assembly comprises a cross arm (16) arranged on the outer wall of the first threaded sleeve (14) and a telescopic arm (17) slidably fitted with the cross arm (16); a slider (15) is slidably provided on the first support arm (1), and one end of the telescopic arm (17) away from the first threaded sleeve (14) is hinged to the slider (15); A column (18) is provided at one end of the telescopic arm (17) close to the first threaded sleeve (14); a bar-shaped through groove (1601) for allowing the column (18) to move is provided on the cross arm (16); a limit plate (27) is further provided at the bottom of the disk body (21); an inclined groove (2701) adapted to the column (18) is provided on the limit plate (27); the column (18) passes through the inclined groove (2701) and is slidably connected to the limit plate (27).

8. The automatically retractable and deployable downhole total station support structure according to claim 1, characterized in that: The height control mechanism comprises a power assembly mounted on the disk body (21) and a plurality of second threaded drive members connected to the power assembly, the second threaded drive members comprising a second screw rod (24) rotatably mounted on the disk body (21) and a second threaded sleeve (25) sleeved on the second screw rod (24) and threadedly connected to the second screw rod (24), the second threaded sleeve (25) being fixedly connected to a push rod (26) slidably mounted on the disk body (21), one end of the push rod (26) away from the second threaded sleeve (25) being fixed to the upper cover (22), and the second screw rod (24) being provided with a gear (23) connected to the power assembly.

9. The automatically retractable and deployable downhole total station support structure according to claim 8, characterized in that: The power assembly comprises a bevel gear ring (20) rotatably mounted in the disk body (21), a driving wheel (19) rotatably mounted on the disk body (21) and meshing with the bevel gear ring (20), and a second rotating wheel (10) coaxially mounted with the driving wheel (19), and teeth meshing with the gear (23) are provided on the inner wall of the bevel gear ring (20).

10. A method for folding and unfolding the automatically foldable downhole total station support structure as claimed in claim 1, characterized in that ； When folding, the height control mechanism is controlled to drive the upper cover (22) to descend until the upper cover (22) is docked with the plate body (21), and then the expansion mechanism is controlled to drive the multiple groups of support arms to perform synchronous deflection actions until the multiple groups of support arms are switched from an inclined state to a vertical state, and then the support arms are retracted; When unfolding, the retracted arm group is extended, and the expansion mechanism is controlled to drive the multiple support arm groups to switch from a vertical state to an inclined state. After the placement of the measuring instrument is completed, the height of the upper cover (22) is adjusted through the height control mechanism.

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