An engineering survey level support device

Abstract

The present invention relates to the technical field of engineering equipment brackets, and particularly to a support device for an engineering survey level, which includes a load-carrying turntable and a plurality of support rods rotatably arranged at the lower end of the load-carrying turntable. The bottoms of the plurality of support rods are all provided with rounded corners, and a positioning mechanism is provided at the bottom of each of the plurality of support rods. After this tripod is unfolded, it is convenient to use on relatively soft muddy ground. The contact area and the gripping force between the tripod and the muddy ground will be improved. After the level is mounted on the load-carrying turntable of the tripod, it will not settle or shift in position on the muddy ground, ensuring the normal progress of the measurement work. This tripod is convenient to use on multi-rocky ground, and can be fixed by means of the rock crevices, and is applicable to rock crevices of different sizes and different angles. The stability of the tripod will be improved. After the level is mounted on the load-carrying turntable of the tripod, it is not easy to be blown or toppled by the wind, thus bringing convenience to the measurement work.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering equipment brackets, and particularly to a support device for an engineering survey level. Background Technique

[0002] An engineering survey level is an instrument for measuring the height difference between ground points by establishing a horizontal line of sight. The level usually needs to be installed on the top turntable of a tripod for use. Because the core requirement of the level is to accurately measure the height difference, only when the instrument is in a stable state can the established horizontal line of sight be accurate. The three support rods of the tripod form a stable triangular structure, which can effectively disperse the weight of the level and the equipment it carries, reduce shaking and displacement. At the same time, each support rod of the tripod has the function of length adjustment, so as to meet the placement requirements of the level at different heights and adapt to the stable horizontal support on uneven terrain.

[0003] However, the bottom of each support rod of the existing tripod for a level is usually pointed, with a small contact area with the ground. When the tripod is placed on relatively soft muddy ground to meet the measurement requirements of the level in special areas, after the level is installed on the top turntable of the tripod, the tripod will sink or tilt on the soft muddy ground due to the gravity of the level, affecting the measurement work. At the same time, when the tripod is placed in a rocky area to meet the measurement requirements of the level in other special areas, since there are many rocks of different sizes and shapes in the rocky area, it is difficult for the tripod to have a stable foothold and is easily blown by the wind or even blown down, bringing difficulties to the measurement work. Summary of the Invention

[0004] The purpose of the present invention is to provide a support device for an engineering survey level to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A support device for an engineering survey level, including a load-bearing turntable and a plurality of support rods rotatably arranged at the lower end of the load-bearing turntable. The bottoms of the plurality of support rods are all provided with rounded corners, and positioning mechanisms are provided at the bottoms of the plurality of support rods;

[0006] The positioning mechanism includes a square shell, which is attached to the bottom of the support rod. An auxiliary fixing component is provided on the square shell, and a connecting component is provided between the square shell and the support rod. A support block is fixedly connected to the middle of the inner wall of the square shell. A bidirectional lead screw is rotatably installed through the middle of the side wall of the support block. One end of the bidirectional lead screw is rotatably connected to a fixed block, and a rotating component is provided between the other end of the bidirectional lead screw and the square shell. The fixed block is fixedly connected to the inner wall of the square shell. Sliders are symmetrically and threadedly sleeved on the outer wall of the bidirectional lead screw. The support block is located between the two sliders. Both sliders are attached to the inner wall of the square shell. The lower ends of both sliders are each provided with a plug board through an adjusting mechanism. Both plug boards are slidably arranged in the lower inner wall of the square shell;

[0007] The adjusting mechanism includes a square groove, which is opened on the wall surface of the slider corresponding to the support block. A connecting rod is rotatably connected to the top of the square groove. The lower end of the connecting rod movably passes through the lower end of the slider. The lower end of the connecting rod is fixedly connected to the middle of the upper end of the plug board. A rotating mechanism is provided among the connecting rod, the slider and the square shell.

[0008] Preferably, the auxiliary fixing component includes four auxiliary plates. The four auxiliary plates are paired in two and are respectively fixedly connected to the two side walls of the square shell. A row of linearly arranged plug pins are fixedly connected to the lower ends of the four auxiliary plates.

[0009] Preferably, the connecting component includes a screw hole and two connecting plates. The two connecting plates are symmetrically and fixedly connected to the upper end of the square shell. The support rod is attached between the two connecting plates. A knob screw is screwed through the inner wall of one of the connecting plates. The screw hole is opened on the outer wall of the support rod corresponding to the knob screw. The knob screw is in threaded cooperation with the screw hole.

[0010] Preferably, the rotating component includes a connecting cylinder and bevel gear II. The connecting cylinder is fixedly communicated with the upper end of the square shell away from the support rod. A rotating shaft is rotatably installed through the inner wall of the upper end of the connecting cylinder. A rotating block and bevel gear I are respectively fixedly connected to the upper and lower ends of the rotating shaft. A rubber sleeve is fixedly connected to the top end inside the connecting cylinder. The inner wall of the rubber sleeve is in close fit with the outer wall of the rotating shaft. Bevel gear II is fixedly connected to the end of the bidirectional lead screw away from the fixed block. Bevel gear II meshes with bevel gear I.

[0011] Preferably, the rotating mechanism includes a worm gear, a connecting column and a card slot. The worm gear is fixedly sleeved on the outer wall of the connecting rod. One end of the connecting column is rotatably connected to the square groove. The other end of the connecting column sequentially passes through the slider and the square shell in a movable manner. The card slot is opened on one side wall of the square shell corresponding to the connecting column. The card slot and the connecting column are slidably matched with each other. A rotating block is fixedly connected to the other end of the connecting column. A worm is fixedly inserted through the outer wall of the connecting column corresponding to the worm gear. The worm and the worm gear are meshed with each other. A limiting mechanism is arranged between the connecting column, the square groove and the rotating block.

[0012] Preferably, the limiting mechanism includes a columnar groove, a splicing rod and a support plate. The columnar groove is opened on the inner wall of the connecting column. The splicing rod is sequentially slidably inserted into the rotating block and the inner wall of the connecting column. One end of the splicing rod extends into the columnar groove and is fixedly connected with a splicing plate. The other end of the splicing rod is fixedly connected with a pressing block. The splicing plate is located in the columnar groove. A plurality of springs are fixedly connected between the wall surface of the splicing plate far away from the splicing rod and the columnar groove. The support plate is fixedly connected to the bottom of the square groove. A circular ring is fixedly connected to the upper end of the support plate. The circular ring is slidably sleeved on the outer wall of the connecting column. A fixing mechanism is arranged between the circular ring and the splicing plate.

[0013] Preferably, the fixing mechanism includes a plug pin and a plurality of limiting holes. The plug pin is fixedly connected to the outer wall of the splicing plate corresponding to the circular ring. The end of the plug pin far away from the splicing plate movably passes through the connecting column. The plurality of limiting holes are arranged on the inner wall of the circular ring in a circular array around the center of the circular ring. The end of the plug pin far away from the splicing plate is slidably matched with one of the limiting holes.

[0014] Preferably, sliding grooves are symmetrically opened at the lower end of the square shell. The two sliding grooves are respectively slidably matched with two insertion plates.

[0015] Preferably, baffles are fixedly connected to the lower edges of the mutually remote wall surfaces of the two sliders. Both baffles are in contact with the inner bottom end of the square shell.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. Through the mutual cooperation of the square shell, the auxiliary fixing component, the connecting component, the support block, the bidirectional lead screw, the fixing block, the rotating component, the slider, the adjusting mechanism, the rotating mechanism, the limiting mechanism, the fixing mechanism and the insertion plate, after the three-legged bracket is unfolded, it is convenient to use on relatively soft muddy ground. The contact area and the grip force between the three-legged bracket and the muddy ground will be improved. When the level is mounted on the loading turntable of the three-legged bracket, it will not sink or shift in position on the muddy ground, ensuring the normal progress of the measurement work.

[0018] 2. This tripod is convenient to use on rocky ground and can be fixed by means of rock crevices. It is applicable to rock crevices of different sizes and angles, which can improve the stability of the tripod. After the level is mounted on the load-carrying turntable of the tripod, it is not easily blown by the wind or toppled, thus facilitating the measurement work. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 of the present invention Figure 1 is an enlarged view of the structure at A in;

[0021] Figure 3 is a schematic diagram of the structure at the rotating block and the square shell of the present invention;

[0022] Figure 4 is a partial cross-sectional view of the square shell and the connecting tube of the present invention;

[0023] Figure 5 is a partial cross-sectional view of the slider of the present invention;

[0024] Figure 6 is a partial cross-sectional view of the connecting column, the rotating block and the ring of the present invention;

[0025] Figure 7 of the present invention Figure 6 is an enlarged view of the structure at B in;

[0026] Figure 8 is a bottom view of the square shell of the present invention;

[0027] Figure 9 is a partial cross-sectional view of the support plate and the ring of the present invention.

[0028] In the drawings, the list of components represented by each reference numeral is as follows: 1. Load-carrying turntable; 2. Support rod; 3. Square shell; 4. Auxiliary plate; 5. Connecting plate; 6. Plug; 7. Insertion plate; 8. Connecting tube; 9. Rotating block; 10. Knob screw; 11. Screw hole; 12. Card slot; 13. Rotating block; 14. Fixed block; 15. Bi-directional lead screw; 16. Slider; 17. Support block; 18. Rotating shaft; 19. Rubber sleeve; 20. Bevel gear one; 21. Bevel gear two; 22. Baffle; 23. Connecting column; 24. Ring; 25. Pressing block; 26. Support plate; 27. Worm gear; 28. Connecting rod; 29. Worm; 30. Columnar groove; 31. Splicing plate; 32. Splicing rod; 33. Spring; 34. Plug pin; 35. Slide groove; 36. Limiting hole; 37. Square groove. DETAILED DESCRIPTION OF THE INVENTION

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0030] The present invention provides a technical solution: As Figure 1 - Figure 9 shown, an engineering survey level support device includes a load-bearing turntable 1 and a plurality of support rods 2 rotatably arranged at the lower end of the load-bearing turntable 1. The bottoms of the plurality of support rods 2 are all provided with rounded corners, and positioning mechanisms are provided at the bottoms of the plurality of support rods 2;

[0031] The positioning mechanism includes a square shell 3. The square shell 3 is attached to the bottom of the support rod 2. An auxiliary fixing component is provided on the square shell 3. A connecting component is provided between the square shell 3 and the support rod 2. A support block 17 is fixedly connected to the middle of the inner wall of the square shell 3. A bidirectional lead screw 15 is rotatably installed through the middle of the side wall of the support block 17. One end of the bidirectional lead screw 15 is rotatably connected to a fixed block 14. A rotating component is provided between the other end of the bidirectional lead screw 15 and the square shell 3. The fixed block 14 is fixedly connected to the inner wall of the square shell 3. Sliders 16 are symmetrically threadedly sleeved on the outer wall of the bidirectional lead screw 15. The support block 17 is located between the two sliders 16. Both sliders 16 are attached to the inner wall of the square shell 3. The lower ends of both sliders 16 are provided with insertion plates 7 through an adjusting mechanism. Both insertion plates 7 are slidably arranged in the lower inner wall of the square shell 3;

[0032] The adjusting mechanism includes a square groove 37. The square groove 37 is opened on the wall surface of the slider 16 corresponding to the support block 17. The top of the square groove 37 is rotatably connected to a connecting rod 28. The lower end of the connecting rod 28 movably penetrates through the lower end of the slider 16. The lower end of the connecting rod 28 is fixedly connected to the middle of the upper end of the insertion plate 7. A rotating mechanism is provided among the connecting rod 28, the slider 16 and the square shell 3.

[0033] The auxiliary fixing component includes four auxiliary plates 4. The four auxiliary plates 4 are fixedly connected to the two side walls of the square shell 3 in pairs of two. A row of insertion pins 6 arranged in a linear array are fixedly connected to the lower ends of the four auxiliary plates 4.

[0034] The connecting component includes a threaded hole 11 and two connecting plates 5. The two connecting plates 5 are symmetrically fixedly connected to the upper end of the square shell 3. The support rod 2 is attached between the two connecting plates 5. A knob screw 10 is screwed through the inner wall of one of the connecting plates 5. The threaded hole 11 is opened on the outer wall of the support rod 2 corresponding to the knob screw 10. The knob screw 10 is in threaded cooperation with the threaded hole 11.

[0035] The rotating assembly includes a connecting cylinder 8 and a second bevel gear 21. The connecting cylinder 8 is fixedly communicated with the upper end of the square shell 3 away from the support rod 2. The inner wall of the upper end of the connecting cylinder 8 is rotatably installed through a rotating shaft 18. The upper and lower ends of the rotating shaft 18 are respectively fixedly connected with a rotating block 9 and a first bevel gear 20. The inner top of the connecting cylinder 8 is fixedly connected with a rubber sleeve 19. The inner wall of the rubber sleeve 19 is closely attached to the outer wall of the rotating shaft 18. The second bevel gear 21 is fixedly connected to one end of the bidirectional lead screw 15 away from the fixed block 14. The second bevel gear 21 meshes with the first bevel gear 20.

[0036] The rotating mechanism includes a worm gear 27, a connecting column 23 and a clamping groove 12. The worm gear 27 is fixedly sleeved on the outer wall of the connecting rod 28. One end of the connecting column 23 is rotatably connected to the square groove 37. The other end of the connecting column 23 sequentially passes through the slider 16 and the square shell 3 movably. The clamping groove 12 is opened on one side wall of the square shell 3 corresponding to the connecting column 23. The clamping groove 12 and the connecting column 23 are slidably matched. The other end of the connecting column 23 is fixedly connected with a rotating block 13. A worm 29 is fixedly inserted through the outer wall of the connecting column 23 corresponding to the worm gear 27. The worm 29 meshes with the worm gear 27. A limiting mechanism is arranged between the connecting column 23, the square groove 37 and the rotating block 13.

[0037] The limiting mechanism includes a columnar groove 30, a splicing rod 32 and a support plate 26. The columnar groove 30 is opened on the inner wall of the connecting column 23. The splicing rod 32 is sequentially slidably inserted into the rotating block 13 and the inner wall of the connecting column 23. One end of the splicing rod 32 extends into the columnar groove 30 and is fixedly connected with a splicing plate 31. The other end of the splicing rod 32 is fixedly connected with a pressing block 25. The splicing plate 31 is located in the columnar groove 30. A plurality of springs 33 are fixedly connected between the wall surface of the splicing plate 31 away from the splicing rod 32 and the columnar groove 30. The support plate 26 is fixedly connected to the bottom of the square groove 37. The upper end of the support plate 26 is fixedly connected with a circular ring 24 (as Figure 9 shown), and the circular ring 24 is slidably sleeved on the outer wall of the connecting column 23. A fixing mechanism is arranged between the circular ring 24 and the splicing plate 31.

[0038] The fixing mechanism includes a bolt 34 and a plurality of limiting holes 36. The bolt 34 is fixedly connected to the outer wall of the splicing plate 31 corresponding to the circular ring 24. One end of the bolt 34 away from the splicing plate 31 movably passes through the connecting column 23. The plurality of limiting holes 36 are arranged in an annular array around the center of the circular ring 24 on the inner wall of the circular ring 24. One end of the bolt 34 away from the splicing plate 31 is slidably matched with one of the limiting holes 36.

[0039] The lower end of the square shell 3 is symmetrically provided with sliding grooves 35, and the two sliding grooves 35 are respectively slidably matched with the two inserting plates 7.

[0040] The lower edges of the mutually remote wall surfaces of the two sliders 16 are both fixedly connected with baffles 22, and the two baffles 22 are both attached to the inner bottom end of the square shell 3.

[0041] Working principle: When using this device on relatively soft muddy ground, multiple support rods 2 can be rotated and unfolded under the load-carrying turntable 1 to an appropriate angle, and the two insertion plates 7 under each support rod 2 are inserted into the muddy ground. At this time, the square shell 3 at the bottom of each support rod 2 will contact the surface of the muddy ground, and the four auxiliary plates 4 outside the square shell 3 will also contact the surface of the muddy ground, and the nails 6 under the four auxiliary plates 4 will also be inserted into the muddy ground. Then each square shell 3 will be fixed on the surface of the muddy ground due to the action of the insertion plates 7 and the nails 6. At this time, since each support rod 2 can be adjusted in length (this is a well-known prior art and will not be elaborated), and each support rod 2 can be rotated and adjusted on the corresponding square shell 3, then the load-carrying turntable 1 connected to the tops of multiple support rods 2 can be adjusted to a stable horizontal state. Subsequently, a level is installed on the load-carrying turntable 1. At this time, under the action of the square shell 3 and the auxiliary plates 4, the contact area between each support rod 2 and the muddy ground can be increased, so that settlement is not likely to occur. Secondly, the insertion plates 7 and the nails 6 can form a certain biting and frictional effect with the soil, which can improve the grip between each support rod 2 and the muddy ground, so that it is not likely to shift in position due to the influence of wind or other vibration factors, etc., and thus the normal progress of the measurement work can be ensured on relatively soft muddy ground.

[0042] When used on rocky ground, first rotate the square shell 3 at the bottom of a support rod 2. The square shell 3 will drive two inserting plates 7, two connecting plates 5, etc. to rotate together until the knob screw 10 on one of the connecting plates 5 corresponds to the screw hole 11 on the support rod 2. At this time, rotate the knob screw 10 to screw it into the screw hole 11 to lock the corresponding square shell 3, support rod 2, two inserting plates 7, two connecting plates 5, etc. together. Similarly, according to the same operation method, other corresponding square shells 3, support rods 2, two inserting plates 7, two connecting plates 5, etc. can be locked together. Subsequently, a large rock with a rock crack can be found (the rock crack on the rock is caused by physical or chemical reasons, which will not be elaborated). After finding the rock crack, insert the two inserting plates 7 under a support rod 2 tightly into the rock crack. If the size of the rock crack is larger than the size formed by the two inserting plates 7, at this time, the corresponding rotating block 9 can be rotated. The rotating block 9 will drive the rotating shaft 18 to rotate. The rotating shaft 18 can drive the first bevel gear 20 to rotate. The first bevel gear 20 can drive the second bevel gear 21 to rotate. The second bevel gear 21 can drive the bidirectional lead screw 15 to rotate on the support block 17 and the fixed block 14. The bidirectional lead screw 15 can drive two sliders 16 to slide away from each other in the square shell 3. Each slider 16 can drive the inserting plate 7 connected to it to slide in the corresponding chute 35. Then the two inserting plates 7 will also move away from each other until the two inserting plates 7 are tightly pressed against the rock crack. Then the support rod 2 will be fixed by means of the rock crack. The two inserting plates 7 under the other support rod 2 can be placed on the surface of other suitable rocks, and the horizontal stability of the load-carrying turntable 1 can be achieved by adjusting the length of each support rod 2. Finally, the level is installed on the load-carrying turntable 1. Since one of the support rods 2 is fixed by means of the rock crack, the stability of the whole device will be improved, so it is not easily blown by the wind or toppled, which brings convenience to the measurement work. It should be noted that under the action of the friction force between the rubber sleeve 19 and the rotating shaft 18, the rotating block 9, the rotating shaft 18, the first bevel gear 20, the second bevel gear 21 and the bidirectional lead screw 15 will all maintain a certain fixed state after rotation and will not easily rotate or deflect slightly.

[0043] It is worth mentioning that hold a rotating block 13 and press the pressing block 25 outside the rotating block 13 to fit with the rotating block 13. During the process of pressing the pressing block 25, the splicing rod 32 will be driven to slide in the inner wall of the rotating block 13 towards the connecting column 23. The splicing rod 32 will drive the splicing plate 31 to move together. The splicing plate 31 will also squeeze a plurality of springs 33 connected between the splicing plate 31 and the columnar groove 30. The splicing plate 31 will also drive the bolt 34 to leave a limiting hole 36 in the ring 24. Due to the loss of the mutual cooperation and restriction between the bolt 34 and the limiting hole 36, the rotating block 13 can be rotated subsequently. The rotating block 13 will drive the connecting column 23 to rotate on the square groove 37 on a corresponding slider 16 and rotate inside the slider 16, and will also rotate on a corresponding clamping groove 12, and will also rotate inside the ring 24. The connecting column 23 will drive the worm 29 to rotate, the worm 29 will drive the worm gear 27 to rotate, the worm gear 27 will drive the connecting rod 28 to rotate, and the connecting rod 28 will drive a corresponding inserted plate 7 connected to rotate. Since a plurality of limiting holes 36 are provided in the ring 24, when the pressing block 25 is released, under the action of the spring 33, the pressing block 25, the splicing rod 32, the splicing plate 31 and the bolt 34 will all be reset. Subsequently, rotate the rotating block 13 to drive the bolt 34 to rotate until it can be inserted into another limiting hole 36 in the ring 24. Then the connecting column 23 will be locked, and then the rotating block 13 will be fixed after rotation. Then the angle of the inserted plate 7 can be kept fixed after adjustment, and the adjustment range of the angle of the inserted plate 7 depends on the bolt 34 being inserted into different limiting holes 36 in the ring 24. Similarly, according to the same operation method, the angle of the other inserted plate 7 can be fixed and adjusted. Thus, when facing rock cracks at different angles, the two inserted plates 7 can be adjusted in angle to adapt to the insertion and tightening of rock cracks at different angles, with good applicability.

[0044] It should be noted that when the two sliders 16 move, they will also drive the respective connected baffles 22 to move together. When the two sliders 16 are in contact with the support block 17 (when the two sliders 16 are separated from the support block 17, it is used on multi-rocky ground), it can be combined with Figure 4 and Figure 8 to see that the two baffles 22 can seal the two chute grooves 35, so that when the square shell 3 contacts the muddy ground, soil can be prevented from entering the square shell 3 along the two chute grooves 35.

[0045] It also should be noted that when the two sliders 16 move, they will also drive the respective connected connecting columns 23, connecting rods 28, worm gears 27, worms 29, support plates 26, rings 24, rotating blocks 13 and inserted plates 7 to move together. The connecting column 23 will also slide on the corresponding clamping groove 12.

[0046] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An engineering surveying level support device, comprising a load-carrying circular table and a plurality of support rods rotatably arranged at the lower end of the load-carrying circular table, characterized in that: The bottoms of multiple support rods are all provided with inverted rounded corners, and positioning mechanisms are arranged at the bottoms of the multiple support rods; The positioning mechanism includes a square shell which fits against the bottom of the support rod. An auxiliary fixing component is arranged on the square shell. A connecting component is arranged between the square shell and the support rod. A support block is fixedly connected to the middle of the inner wall of the square shell. A bidirectional lead screw is rotatably installed through the middle of the side wall of the support block. One end of the bidirectional lead screw is rotatably connected to a fixed block. A rotating component is arranged between the other end of the bidirectional lead screw and the square shell. The fixed block is fixedly connected to the inner wall of the square shell. Sliders are symmetrically and threadedly sleeved on the outer wall of the bidirectional lead screw. The support block is located between the two sliders. Both sliders are in contact with the inner wall of the square shell. The lower ends of both sliders are each provided with a plug board through an adjusting mechanism. Both plug boards are slidably arranged in the lower inner wall of the square shell; The adjusting mechanism includes a square groove which is opened on the wall surface of the slider corresponding to the support block. A connecting rod is rotatably connected to the top of the square groove. The lower end of the connecting rod movably penetrates through the lower end of the slider. The lower end of the connecting rod is fixedly connected to the middle of the upper end of the plug board. A rotating mechanism is arranged among the connecting rod, the slider and the square shell; The rotating mechanism includes a worm gear, a connecting column and a clamping groove. The worm gear is fixedly sleeved on the outer wall of the connecting rod. One end of the connecting column is rotatably connected to the square groove. The other end of the connecting column sequentially movably penetrates through the slider and the square shell. The clamping groove is opened on one side wall of the square shell corresponding to the connecting column. The clamping groove and the connecting column are slidably matched with each other. A rotating block is fixedly connected to the other end of the connecting column. A worm is fixedly inserted through the outer wall of the connecting column corresponding to the worm gear. The worm and the worm gear are meshed with each other. A limiting mechanism is arranged among the connecting column, the square groove and the rotating block; The limiting mechanism includes a columnar groove, a splicing rod and a support plate. The columnar groove is opened on the inner wall of the connecting column. The splicing rod is sequentially slidably inserted into the rotating block and the inner wall of the connecting column. One end of the splicing rod extends into the columnar groove and is fixedly connected to a splicing plate. The other end of the splicing rod is fixedly connected to a pressing block. The splicing plate is located in the columnar groove. Multiple springs are fixedly connected between the wall surface of the splicing plate away from the splicing rod and the columnar groove. The support plate is fixedly connected to the bottom of the square groove. A circular ring is fixedly connected to the upper end of the support plate. The circular ring is slidably sleeved on the outer wall of the connecting column. A fixing mechanism is arranged between the circular ring and the splicing plate; The fixing mechanism includes a plug pin and multiple limiting holes. The plug pin is fixedly connected to the outer wall of the splicing plate corresponding to the circular ring. One end of the plug pin away from the splicing plate movably penetrates through the connecting column. The multiple limiting holes are annularly and arrayed around the center of the circular ring and opened on the inner wall of the circular ring. One end of the plug pin away from the splicing plate is slidably matched with one of the limiting holes.

2. The engineering survey level support device according to claim 1, characterized in that: The auxiliary fixing component includes four auxiliary plates. The four auxiliary plates are paired in two and respectively fixedly connected to the two side walls of the square shell. A row of insertion pins arranged in a linear array are fixedly connected to the lower ends of the four auxiliary plates.

3. The engineering surveying level support device according to claim 1, wherein: The connecting component includes a threaded hole and two connecting plates. The two connecting plates are symmetrically and fixedly connected to the upper end of the square shell. The support rod fits between the two connecting plates. A knob screw is screwed through the inner wall of one of the connecting plates. The threaded hole is opened on the outer wall of the support rod corresponding to the knob screw. The knob screw and the threaded hole are in threaded cooperation.

4. The engineering surveying level support device according to claim 1, characterized in that: The rotating assembly includes a connecting cylinder and a second bevel gear. The connecting cylinder is fixedly communicated with the upper end of the square shell away from the support rod. The inner wall of the upper end of the connecting cylinder is rotatably installed with a rotating shaft through it. The upper and lower ends of the rotating shaft are respectively fixedly connected with a rotating block and a first bevel gear. The inner top of the connecting cylinder is fixedly connected with a rubber sleeve, and the inner wall of the rubber sleeve is closely attached to the outer wall of the rotating shaft. The second bevel gear is fixedly connected to one end of the bidirectional lead screw away from the fixed block, and the second bevel gear meshes with the first bevel gear.

5. The engineering survey level support device according to claim 1, characterized in that: Chutes are symmetrically opened at the lower end of the square shell, and the two chutes are respectively in sliding fit with the two inserting plates.

6. The support device for an engineering surveying level according to claim 1, characterized in that: At the lower edge of the mutually distant walls of the two sliders, baffles are fixedly connected respectively, and both baffles are in contact with the inner bottom end of the square shell.

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