Horizontal calibration device

Abstract

The utility model discloses a horizontal calibration device which comprises a gradienter, a height adjusting device is installed below the gradienter, a supporting device is arranged below the gradienter, the supporting device comprises a fixing sleeve, a guide block, a clamping block, a guide groove, a sliding sleeve, a supporting rod, a rotating sleeve, an adaptive groove and an adaptive block, and the guide block is arranged in the guide groove. The outer wall of the sliding sleeve is movably connected with the rotating sleeve through threads, the supporting rod is arranged on the inner side of the fixing sleeve, the adapting block is arranged in the adapting groove, the locking mechanism is arranged on the outer side of the fixing sleeve and comprises a locking sleeve, an ejector rod, a connecting block, a control sleeve, a locking groove, a locking rod, a reset spring, a receding hole, a return stroke block and a spring, and the ejector rod is connected to one side of the locking sleeve. The two ends of the spring are connected with the connecting block and the return stroke block, the multiple locking grooves are formed in the outer side of the fixing sleeve, and one end of the locking rod is connected with the outer wall of the rotating sleeve through the reset spring. The application range of equipment is widened, the operation process is simplified, and meanwhile stability and safety in the using process are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of construction engineering cost, and more particularly to a level calibration device. Background Art

[0002] In the existing field of level calibration device technology, especially in equipment used in construction engineering cost estimation, there are a series of problems that need to be solved. These problems not only affect the use effect of the equipment, but also to some extent limit the application of level calibration technology in a wider range of fields.

[0003] First, the fixed structural design of the equipment height is a significant limitation. In the complex and ever-changing construction site environment, different construction phases and different types of building structures often require horizontal calibration at different heights. However, the existing fixed-height design severely restricts the scope of application of the equipment. This lack of flexibility results in the equipment being unable to effectively perform its functions or even being completely unusable in certain specific scenarios. This not only reduces work efficiency, but may also lead to inaccurate measurement results, thereby affecting the quality and cost control of the entire project.

[0004] Secondly, the instability of ground conditions poses a serious challenge to the use of equipment. The ground at a construction site is usually not completely flat, especially in the unfinished stage of the project. The ground often has various degrees of unevenness. This unevenness may be caused by temporary accumulation during the construction process, unfinished ground treatment, or the undulations of the natural terrain. However, the bottom structure design of existing equipment is too simple and lacks an effective adaptive mechanism. This makes it difficult for the equipment to remain stable and level when placed, seriously affecting the accuracy of the measurement. Even a slight tilt or shake may lead to significant deviations in the measurement results. Especially when conducting long-distance or high-precision measurements, this error will be further amplified, which not only increases the difficulty of the operator's work, but may also lead to erroneous measurement data being used for engineering decisions, ultimately affecting the quality and cost of the entire project.

[0005] In addition, although some manufacturers have tried to solve the above problems by adding support devices to the bottom of the equipment, these solutions often have other defects. The most common problems are the imperfect support mechanism and insufficient stability. These support devices usually adopt simple adjustable mechanisms. However, these mechanisms are often designed without considering the stability under long-term use and harsh environments. When used frequently or subjected to accidental impact, these support devices are prone to loosening or even falling off. For example, in a construction environment with large vibrations, this instability will not only lead to sudden changes in the measurement process and affect the measurement accuracy, but may also cause the equipment to topple over during operation, posing a safety hazard. Utility Model Content

[0006] (1) Technical problems solved

[0007] In view of the problems existing in the prior art, the utility model provides a level calibration device to solve the technical problems mentioned in the background technology.

[0008] (2) Technical solution

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a level calibration device, including a spirit level, characterized in that: a height adjustment device is installed below the spirit level, a support device is provided below the spirit level, the support device includes a fixed sleeve, a guide block, a clamping block, a guide groove, a sliding sleeve, a support rod, a rotating sleeve, an adapter groove and an adapter block, the guide block is connected to one side of the clamping block, the guide groove is provided on the inner side of the fixed sleeve, and the guide block is slidably provided in the guide groove, the outer wall of the sliding sleeve is movably connected to the inner side of the rotating sleeve through a thread, the support rod is movably provided on the inner side of the fixed sleeve, the rotating sleeve is rotatably provided on the outer side of the fixed sleeve, the adapter groove is provided on the top of the sliding sleeve, and the adapter block is connected On the other side of the card block, the adapter block is slidably arranged in the adapter groove, and a locking mechanism is provided on the outside of the fixed sleeve. The locking mechanism includes a locking sleeve, a push rod, a connecting block, a control sleeve, a locking groove, a locking rod, a reset spring, a give way hole, a return block and a spring. The locking sleeve is slidingly sleeved on the outside of the fixed tube, the push rod is connected to one side of the locking sleeve, the connecting block is fixedly connected to the outside of the fixed sleeve, and the two ends of the spring are respectively connected to the connecting block and the return block, and the control sleeve is rotatably sleeved on the outside of the fixed sleeve. A plurality of locking grooves are opened on the outside of the fixed sleeve, one end of the locking rod is inserted into the locking groove, and the other end of the locking rod is connected to the outer wall of the rotating sleeve through a reset spring, and the return block is fixedly connected to one side of the control sleeve.

[0010] The present invention is further configured such that a tension spring is movably provided in the fixing sleeve, and one end of the tension spring is connected to the top end of the support rod.

[0011] The present invention is further configured such that a limiting sleeve is fixedly provided on the inner side of the sliding sleeve, and the support rod slides through the limiting sleeve.

[0012] The utility model is further configured such that a push spring is provided on the outer movable sleeve of the push rod, and one end of the push spring is in contact connection with the control sleeve.

[0013] The utility model is further configured as follows: the height adjustment device includes a sliding rod, a sleeve, a connecting plate and a connecting rod; the sliding rod is detachably connected to the bottom of the spirit level; the sleeve is slidably sleeved on the outside of the sliding rod; the connecting plate is rotatably connected to the outside of the sleeve; and one end of the connecting rod is rotatably connected to the connecting plate.

[0014] The utility model is further configured as follows: a connecting frame is provided on the outside of the top end of the sleeve, the other end of the connecting rod is rotatably connected to the connecting frame, a screw is provided on the outside of the connecting frame, the screw and the connecting frame are movably connected through a thread, and one end of the screw passes through the sleeve and abuts against the outer wall of the sliding rod. The configuration of the above components ensures stability after height adjustment.

[0015] The utility model is further configured such that a knob is connected to the other end of the screw rod, and the configuration of the knob facilitates the rotation of the screw rod.

[0016] The present invention is further configured such that a through hole is provided on the connecting plate, the position of the through hole corresponds to the position of the support rod, and the function of the through hole is to make way for the support rod.

[0017] (3) Beneficial effects

[0018] Compared with the prior art, the present invention provides a level calibration device with the following beneficial effects:

[0019] 1. The height adjustment device cleverly solves the problem of inflexible use caused by the fixed height of equipment in the existing technology. Through the coordinated design of components such as sliding rods, sleeves, connecting plates and connecting rods, the adjustable height of the spirit level is achieved. This design not only increases the applicability of the equipment, but also allows the operator to easily adjust the height of the spirit level according to different working environments and measurement requirements, thereby adapting to various complex construction scenarios. In particular, the design of the screw and knob makes the height adjustment process simple and precise. This flexible height adjustment mechanism greatly improves the adaptability of the equipment, enabling it to perform at its best in various construction projects, thereby improving work efficiency and measurement accuracy.

[0020] 2. The innovative design of the support device effectively solves the problem in the prior art that the equipment is difficult to keep level on uneven ground. Through the ingenious coordination of components such as the fixed sleeve, guide block, clamping block, sliding sleeve and support rod, adaptation to different ground conditions is achieved. This design allows each support rod to move in height independently, thereby ensuring that the equipment can remain level on any terrain. In particular, the application of tension springs provides appropriate tension for each support rod, making the entire support system flexible and stable. The inclined design of the guide groove and guide block, combined with the coordination of the adapter groove and adapter block, ensures the smoothness of the adjustment process. This multi-point adaptive support system significantly improves the stability and measurement accuracy of the equipment on complex terrain, and solves the problem that traditional equipment is difficult to keep level on uneven ground.

[0021] 3. The design of the locking mechanism cleverly solves the problem of low stability of the support device. Through the coordinated work of components such as the locking sleeve, push rod, control sleeve, locking groove and locking rod, a multi-locking system is formed. This design not only ensures the stability of the support device after adjustment, but also effectively prevents accidental loosening or falling off, further improving the convenience and safety of operation. The design of components such as the control sleeve and the clearance hole makes the locking process simple and reliable. This multi-level locking design significantly improves the reliability of the entire support system, can effectively cope with various vibrations and impacts on the construction site, prevent the support device from slight movement or shaking, thereby ensuring the accuracy and durability of the horizontal calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a level calibration device in the present utility model;

[0023] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure at A in the middle;

[0024] Figure 3 This is a schematic cross-sectional view of the supporting device and locking mechanism of the present invention;

[0025] Figure 4 for Figure 3 Schematic diagram of the local enlarged structure at B in the middle;

[0026] Figure 5 This is a schematic structural diagram of the sliding sleeve portion of the present invention;

[0027] Figure 6 This is a structural diagram of the card block part of the utility model;

[0028] Figure 7 This is a schematic cross-sectional view of the supporting device and locking mechanism at a second angle in the present invention.

[0029] In the figure: 1. Level; 2. Fixed sleeve; 3. Guide block; 4. Clamping block; 5. Guide groove; 6. Sliding sleeve; 7. Support rod; 8. Rotating sleeve; 9. Adapter groove; 10. Adapter block; 11. Locking sleeve; 12. Push rod; 13. Connecting block; 14. Control sleeve; 15. Locking groove; 16. Locking rod; 17. Reset spring; 18. Return block; 19. Spring; 20. Tension spring; 21. Limit sleeve; 22. Push spring; 23. Sliding rod; 24. Sleeve; 25. Connecting plate; 26. Connecting rod; 27. Connecting frame; 28. Screw; 29. Knob; 30. Through hole; 40. Clearance hole. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0032] In the present invention, unless otherwise specified, directions such as "up" and "down" are usually relative to the directions shown in the drawings, or relative to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually relative to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned direction words are not used to limit the present invention.

[0033] See also Figure 1-Figure 7 , a level calibration device includes a spirit level 1, which is characterized in that: a height adjustment device is installed under the spirit level 1, and a supporting device is provided under the spirit level 1, the supporting device includes a fixed sleeve 2, a guide block 3, a clamping block 4, a guide groove 5, a sliding sleeve 6, a support rod 7, a rotating sleeve 8, an adaptation groove 9 and an adaptation block 10, the guide block 3 is connected to one side of the clamping block 4, the guide groove 5 is opened on the inner side of the fixed sleeve 2, and the guide block 3 is slidably set in the guide groove 5, the outer wall of the sliding sleeve 6 is movably connected to the inner side of the rotating sleeve 8 through a thread, the support rod 7 is movably set on the inner side of the fixed sleeve 2, the rotating sleeve 8 is rotatably sleeved on the outer side of the fixed sleeve 2, the adaptation groove 9 is opened on the top of the sliding sleeve 6, the adaptation block 10 is connected to the other side of the clamping block 4, and the adaptation block 10 is slidably set in the adaptation groove 9, A locking mechanism is provided on the outside of the fixed sleeve 2, and the locking mechanism includes a locking sleeve 11, a push rod 12, a connecting block 13, a control sleeve 14, a locking groove 15, a locking rod 16, a reset spring 17, a clearance hole 40, a return block 18 and a spring 19. The locking sleeve 11 is slidingly sleeved on the outside of the fixed tube, the push rod 12 is connected to one side of the locking sleeve 11, the connecting block 13 is fixedly connected to the outside of the fixed sleeve 2, and the two ends of the spring 19 are respectively connected to the connecting block 13 and the return block 18. The control sleeve 14 is rotatably sleeved on the outside of the fixed sleeve 2, and multiple locking grooves 15 are opened on the outside of the fixed sleeve 2. One end of the locking rod 16 is inserted into the locking groove 15, and the other end of the locking rod 16 is connected to the outer wall of the rotating sleeve 8 through the reset spring 17, and the return block 18 is fixedly connected to one side of the control sleeve 14.

[0034] A tension spring 20 is movably provided in the fixing sleeve 2 , and one end of the tension spring 20 is connected to the top end of the support rod 7 .

[0035] A limiting sleeve 21 is fixedly provided on the inner side of the sliding sleeve 6 , and the support rod 7 slides through the limiting sleeve 21 .

[0036] A push spring 22 is provided on the outer movable sleeve of the push rod 12 , and one end of the push spring 22 is in contact connection with the control sleeve 14 .

[0037] In this embodiment, when the device needs to be placed horizontally on an uneven ground, the control sleeve 14 is first rotated, and the control sleeve 14 will drive the return block 18 to move, and then the return block 18 will cooperate with the connecting block 13 to squeeze the spring 19, and at the same time the control sleeve 14 will drive the clearance hole 40 to move. When the spring 19 is squeezed to the limit, the position of the clearance hole 40 corresponds to the position of the push rod 12, and then the locking sleeve 11 is pushed, and the locking sleeve 11 will drive the push rod 12 to pass through the clearance hole 40. At the same time, the locking sleeve 11 will cooperate with the control sleeve 14 to squeeze the push spring 22 arranged on the outside of the push rod 12, and then the outer end of the locking rod 16 will lose the limit of the inner wall of the locking sleeve 11, and then the rotating sleeve 8 is rotated, and the rotating sleeve 8 will drive the locking rod 16 to move, and then the locking groove 15 will One end of the locking rod 16 is squeezed, and due to the rounded structural design of the end of the locking rod 16, one end of the locking rod 16 will slide out of the locking groove 15, and at the same time, the other end of the locking rod 16 will drive the return spring 17 to stretch. At the same time, since the inner side of the rotating sleeve 8 and the outer wall of the sliding sleeve 6 are movably connected through threads, the sliding sleeve 6 will drive the limiting sleeve 21 to slide along the support rod 7, and then the top of the sliding sleeve 6 will drive the card block 4 to slide through the cooperation of the adapter groove 9 and the adapter block 10, and then the card block 4 will drive the guide block 3 to slide along the guide groove 5. Due to the inclined structural design of the guide block 3 and the guide groove 5, the guide block 3 will drive the card block 4 to move outward, and at the same time, the card block 4 will drive the adapter block 10 to slide along the adapter groove 9, so that the card block 4 no longer presses the side wall of the support rod 7. After the bottom end of each support rod 7 contacts the ground, the rotating sleeve 8 is rotated in the opposite direction, and then the sliding sleeve 6 drives the limiting sleeve 21 to slide and reset, and then the sliding sleeve 6 drives the card block 4 to slide and reset through the cooperation of the adapter groove 9 and the adapter block 10, and then the card block 4 drives the guide block 3 to slide and reset along the guide groove 5, and then the guide block 3 drives the card block 4 to gather inward, and then the card block 4 drives the adapter block 10 to slide along the adapter groove 9, and then the inside of the card block 4 will press The outer wall of the support rod 7 is completely tightened. At this time, the locking sleeve 11 is released, and the push spring 22 will push the locking sleeve 11 to slide and reset. At the same time, the locking sleeve 11 drives the push rod 12 to slide and reset. After the push spring 22 is completely reset, the control sleeve 14 is released, and the spring 19 pushes the return block 18 to reset. Then the return block 18 drives the clearance hole 40 to reset to a position that does not correspond to the push rod 12 through the control sleeve 14. Then the push rod 12 will cooperate with the control sleeve 14 to form a stable support for the locking sleeve 11 to prevent the locking sleeve 11 from sliding. Then the locking sleeve 11 will limit the outer end of the locking rod 16 to prevent the locking rod 16 from moving. Then the locking rod 16 will cooperate with the locking groove 15 to limit the rotating sleeve 8 to prevent the rotating sleeve 8 from rotating, thereby ensuring the structural stability of the support device.

[0038] See also Figures 1-4 , as an implementation method of the height adjusting device: the height adjusting device includes a slide rod 23, a sleeve 24, a connecting plate 25 and a connecting rod 26, the slide rod 23 is detachably connected to the bottom of the level 1, the sleeve 24 is slidably sleeved on the outside of the slide rod 23, the connecting plate 25 is rotatably connected to the outside of the sleeve 24, and one end of the connecting rod 26 is rotatably connected to the connecting plate 25.

[0039] A connecting frame 27 is provided on the outside of the top end of the sleeve 24, and the other end of the connecting rod 26 is rotatably connected to the connecting frame 27. A screw 28 is provided on the outside of the connecting frame 27. The screw 28 and the connecting frame 27 are movably connected through a thread, and one end of the screw 28 passes through the sleeve 24 and abuts against the outer wall of the sliding rod 23.

[0040] The other end of the screw rod 28 is connected to a knob 29 .

[0041] A through hole 30 is defined on the connecting plate 25 , and the position of the through hole 30 corresponds to the position of the support rod 7 .

[0042] More specifically, when the device needs to be used, first bend the connecting rod 26 outward so that all the connecting rods 26 are opened, and then the device is placed horizontally on the ground through the support device set under the connecting plate 25, and then the three knobs 29 are turned respectively so that the knobs 29 drive the corresponding screw rods 28 to rotate. Since the screw rods 28 and the connecting frame 27 are movably connected by threads, the three screws 28 will no longer clamp the outside of the slide rod 23, and then pull the slide rod 23 so that the slide rod 23 slides along the sleeve 24, so that the slide rod 23 drives the level 1 to adjust the height. After adjusting to the appropriate height, rotate the three knobs 29 in the opposite direction, and then make the three screws 28 clamp the slide rod 23 again, and then use the level 1 normally for horizontal calibration.

[0043] In summary, when the entire device is in use or running: when the device needs to be placed horizontally on an uneven ground, first rotate the control sleeve 14, the control sleeve 14 will drive the return block 18 to move, and then the return block 18 will cooperate with the connecting block 13 to squeeze the spring 19, and at the same time the control sleeve 14 will drive the clearance hole 40 to move, when the spring 19 is squeezed to the limit, the position of the clearance hole 40 corresponds to the position of the push rod 12, and then push the locking sleeve 11, the locking sleeve 11 will drive the push rod 12 to pass through the clearance hole 40, and at the same time the locking sleeve 11 will cooperate with the control sleeve 14 to squeeze the push spring 22 arranged on the outside of the push rod 12, and then the outer end of the locking rod 16 will lose the limit of the inner wall of the locking sleeve 11, and then rotate the rotating sleeve 8, the rotating sleeve 8 will drive the locking rod 16 to move, and then The locking groove 15 will squeeze one end of the locking rod 16. Due to the rounded structural design at the end of the locking rod 16, one end of the locking rod 16 will slide out of the locking groove 15. At the same time, the other end of the locking rod 16 will drive the return spring 17 to stretch. At the same time, since the inner side of the rotating sleeve 8 and the outer wall of the sliding sleeve 6 are movably connected through threads, the sliding sleeve 6 will drive the limiting sleeve 21 to slide along the support rod 7. Then the top of the sliding sleeve 6 will drive the card block 4 to slide through the cooperation of the adapter groove 9 and the adapter block 10. Then the card block 4 will drive the guide block 3 to slide along the guide groove 5. Due to the inclined structural design of the guide block 3 and the guide groove 5, the guide block 3 will drive the card block 4 to move outward. At the same time, the card block 4 will drive the adapter block 10 to slide along the adapter groove 9, so that the card block 4 no longer presses the side of the support rod 7 The wall is pressed tightly, and then the fixing sleeve 2 is pressed downward so that the bottoms of all support rods 7 are in contact with the ground. Due to the unevenness of the ground, each support rod 7 will slide along the limit sleeve 21 to varying degrees. At the same time, each support rod 7 will drive the corresponding tension spring 20 to stretch to varying degrees. When the bottom end of each support rod 7 contacts the ground, the rotating sleeve 8 is rotated in the opposite direction, and then the sliding sleeve 6 will drive the limit sleeve 21 to slide and reset, and then the sliding sleeve 6 will drive the card block 4 to slide and reset through the cooperation of the adapter groove 9 and the adapter block 10, and then the card block 4 will drive the guide block 3 to slide and reset along the guide groove 5, and then the guide block 3 will drive the card block 4 to gather inward, and then the card block 4 will drive the adapter block 10 to slide along the adapter groove 9, and then the inner side of the card block 4 The outer wall of the support rod 7 will be completely tightened. At this time, the locking sleeve 11 is loosened, and the push spring 22 will push the locking sleeve 11 to slide and reset. At the same time, the locking sleeve 11 drives the push rod 12 to slide and reset. After the push spring 22 is completely reset, the control sleeve 14 is released, and the spring 19 pushes the return block 18 to reset. Then the return block 18 drives the clearance hole 40 to reset to a position that does not correspond to the push rod 12 through the control sleeve 14. Then the push rod 12 will cooperate with the control sleeve 14 to form a stable support for the locking sleeve 11 to prevent the locking sleeve 11 from sliding. Then the locking sleeve 11 will limit the outer end of the locking rod 16 to prevent the locking rod 16 from moving. Then the locking rod 16 will cooperate with the locking groove 15 to limit the rotating sleeve 8 to prevent the rotating sleeve 8 from rotating, thereby ensuring the structural stability of the support device.

[0044] When the device needs to be used, first bend the connecting rod 26 outward so that all the connecting rods 26 are open, and then place the device horizontally on the ground through the support device set under the connecting plate 25, and then turn the three knobs 29 respectively, so that the knob 29 drives the corresponding screw rod 28 to rotate. Since the screw rod 28 and the connecting frame 27 are movably connected by threads, the three screws 28 will no longer clamp the outside of the slide rod 23, and then pull the slide rod 23 to make the slide rod 23 slide along the sleeve 24, so that the slide rod 23 drives the level 1 to adjust the height. After adjusting to the appropriate height, turn the three knobs 29 in the opposite direction, and then make the three screws 28 clamp the slide rod 23 again, and then use the level 1 normally for horizontal calibration.

[0045] In all the schemes mentioned above, the connection between the two components can be selected according to actual conditions by welding, bolt and nut connection, bolt or screw connection or other well-known connection methods, which will not be listed here one by one. In the above, all fixed connections are preferably welded. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field 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 attached claims and their equivalents.

Claims

1. A level calibration device, comprising a level (1), characterized in that: A height adjustment device is installed below the level (1). A support device is provided below the level (1). The support device comprises a fixed sleeve (2), a guide block (3), a clamping block (4), a guide groove (5), a sliding sleeve (6), a support rod (7), a rotating sleeve (8), an adapting groove (9) and an adapting block (10). The guide block (3) is arranged in the guide groove (5). The outer wall of the sliding sleeve (6) is movably connected to the rotating sleeve (8) through a thread. The support rod (7) is arranged on the inner side of the fixed sleeve (2). The rotating sleeve (8) is sleeved on the outer side of the fixed sleeve (2). The adapting block (10) is arranged in the adapting groove (9). A locking mechanism is provided on the outer side of the fixed sleeve (2). The locking mechanism comprises a locking sleeve (11), a push rod (12), a connecting block (13), a control sleeve (14), a locking groove (15), a locking rod (16), a return spring (17), a clearance hole (40), a return block (18) and a spring (19); the locking sleeve (11) is sleeved on the outside of the fixed tube; the push rod (12) is connected to one side of the locking sleeve (11); two ends of the spring (19) are connected to the connecting block (13) and the return block (18); the control sleeve (14) is sleeved on the outside of the fixed sleeve (2); a plurality of locking grooves (15) are provided on the outside of the fixed sleeve (2); and one end of the locking rod (16) is connected to the outer wall of the rotating sleeve (8) through the return spring (17).

2. A level calibration device according to claim 1, characterized in that: A tension spring (20) is movably provided in the fixing sleeve (2), and one end of the tension spring (20) is connected to the top end of the support rod (7).

3. A level calibration device according to claim 2, characterized in that: A limiting sleeve (21) is fixedly provided on the inner side of the sliding sleeve (6), and the supporting rod (7) slides through the limiting sleeve (21).

4. A level calibration device according to claim 1, characterized in that: A push spring (22) is provided on the outer movable sleeve of the push rod (12), and one end of the push spring (22) is in contact connection with the control sleeve (14).

5. A level calibration device according to any one of claims 1 to 4, characterized in that: The height adjustment device comprises a slide bar (23), a sleeve (24), a connecting plate (25) and a connecting rod (26); the slide bar (23) is detachably connected to the bottom of the level (1); the sleeve (24) is slidably sleeved on the outside of the slide bar (23); the connecting plate (25) is rotatably connected to the outside of the sleeve (24); and one end of the connecting rod (26) is rotatably connected to the connecting plate (25).

6. A level calibration device according to claim 5, characterized in that: A connecting frame (27) is provided on the outer side of the top end of the sleeve (24), and the other end of the connecting rod (26) is rotatably connected to the connecting frame (27). A screw rod (28) is provided on the outer side of the connecting frame (27). The screw rod (28) and the connecting frame (27) are movably connected through a thread, and one end of the screw rod (28) passes through the sleeve (24) and abuts against the outer wall of the slide rod (23).

7. A level calibration device according to claim 6, characterized in that: The other end of the screw rod (28) is connected with a knob (29).

8. A level calibration device according to claim 7, characterized in that: A through hole (30) is provided on the connecting plate (25), and the position of the through hole (30) corresponds to the position of the support rod (7).

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