Engineering measurement device with high measurement precision

Abstract

The invention provides an engineering measurement device with high measurement precision, and relates to the field of engineering measurement, the engineering measurement device comprises a state assembly, the state assembly is composed of an indication mechanism, an observation mechanism and an adjustment mechanism, an indication bubble can indicate the erection flatness of a level gauge according to the use position of the indication bubble in a reference ring, the use is convenient and flexible, and the measurement precision is high; and the adjusting mechanism can adjust the size of the indication bubble, so that the leveling instrument can adapt to supporting use of the leveling instrument under different precisions and can adapt to use in different engineering measurement environments, and the problem that the supporting use of the leveling instrument with different precisions cannot be realized due to the fact that the size of the leveling bubble of the existing leveling instrument is fixed and cannot be adjusted is solved.

Description

Technical Field

[0001] This invention relates to the field of engineering measurement technology, and in particular to an engineering measurement device with high measurement accuracy. Background Technology

[0002] Engineering surveying refers to all surveying work in engineering construction. Among them, the level is a commonly used instrument in engineering surveying. It is an instrument used to establish a horizontal line of sight and determine the height difference between two points on the ground. When using a level, it is necessary to judge whether the level is leveled based on the position of the bubble level. Only a leveled level can accurately calculate various data.

[0003] However, with current level instruments, the size of the bubble is fixed and cannot be adjusted, making it impossible to set up and use the level instrument for different levels of precision. For example, when the bubble is large, it easily covers the reference circle. Although this allows for quick level setting, it cannot guarantee that the bubble is in the center of the reference circle. When the bubble is small, it can accurately indicate the position of the bubble inside the reference circle, but this results in a slower level setting speed. It cannot adapt to the level setting and use for different levels of precision, has poor flexibility and adaptability, and is not very practical. Summary of the Invention

[0004] This disclosure relates to a high-precision engineering surveying device, which has a state component. The indicator bubble can indicate the leveling flatness of the level instrument by its position inside the reference circle. It is convenient and flexible to use, and the adjustment mechanism can adjust the size of the indicator bubble, thereby adapting to the leveling use under different accuracy conditions. It can be used in different engineering surveying environments. When the indicator bubble is large, the leveling is set up quickly, but the measurement accuracy is poor. When the indicator bubble is small, the leveling is set up slowly, but the measurement accuracy is improved. It can be adjusted according to the actual engineering surveying needs, and has extremely high flexibility, adaptability and practicality.

[0005] In a first aspect, this disclosure provides an engineering measurement device with high measurement accuracy, specifically comprising: a status component, the status component being composed of an indicating mechanism, an observation mechanism, and an adjustment mechanism; The indicating mechanism includes a connecting rod, a sealing shell, and a pressure balance plate. The connecting rod is fixedly installed on the side of the level, and the sealing shell is fixedly installed on the bottom of the connecting rod. The plane of the sealing shell is parallel to the base plane of the level, and the interior of the sealing shell is filled with a filling liquid. The interior of the sealing shell is filled with an indicating bubble, and a reference ring is provided inside the top shell of the sealing shell. The pressure balance plate is inserted into the interior of the sealing shell. The observation mechanism includes a rotating base and a damping block. The rotating base is rotatably connected to the outside of the sealed housing, and the damping block is inserted into the inside of the rotating base. The adjusting mechanism includes a positioning screw, a suction piston, and a sealing block. The positioning screw is screwed into the inside of the connecting rod via a threaded connection, and the suction piston is rotatably connected to the bottom of the connecting rod. The suction piston is inserted into the inside of the connecting rod, and the sealing block is inserted into the inside of the connecting rod.

[0006] In at least some embodiments, the sealing shell and the pressure balance plate are both transparent, and the interior of the rotating seat is provided with an "L"-shaped observation channel, and a reflective lens is provided at the corner of the observation channel, with the reflective lens tilted at 45 degrees.

[0007] In at least some embodiments, the damping block is provided with a damping top spring inside, and the two ends of the damping top spring abut against the inside of the damping block and the inside of the rotating seat, respectively.

[0008] In at least some embodiments, the end of the damping block near the sealing shell is designed as a semi-circular shape, and the outer side of the sealing shell is provided with a damping groove. The shape of a single groove of the damping groove is semi-circular. Under the action of the damping top spring, the semi-circular part of the damping block is inserted into the inside of the damping groove.

[0009] In at least some embodiments, the bottom of the pressure balance plate is provided with an avoidance top spring, and the two ends of the avoidance top spring abut against the bottom of the pressure balance plate and the inside of the sealing shell, respectively.

[0010] In at least some embodiments, the connecting rod has a piston chamber inside, and the pumping piston is disposed inside the piston chamber. The bottom opening of the piston chamber is located at the center of the reference ring, and the sealing block is disposed at the bottom opening of the piston chamber. The top of the piston chamber has an air passage communicating with the outside.

[0011] In at least some embodiments, the sealing block has an "L"-shaped enlarged air passage inside, the bottom opening of the enlarged air passage is located on the side of the sealing block, and the top of the enlarged air passage is connected to the piston chamber.

[0012] In at least some embodiments, the sealing block has an inverted "L"-shaped reducing air passage inside, the top opening of the reducing air passage is located on the side of the sealing block, and the bottom of the reducing air passage is connected to the inside of the sealing shell.

[0013] In at least some embodiments, the sealing block is provided with a balance top spring on its exterior, and the two ends of the balance top spring abut against the side of the sealing block and the interior of the connecting rod, respectively. There are two balance top springs, and the two balance top springs are symmetrically arranged on the exterior of the sealing block.

[0014] The engineering measurement device with high measurement accuracy provided by the present invention has the following beneficial effects.

[0015] The indicator bubble indicates the leveling level by its position within the reference circle. It is convenient and flexible to use, and the adjustment mechanism can adjust the size of the indicator bubble to adapt to different levels of accuracy. It can be used in different engineering surveying environments. When the indicator bubble is large, the leveling level is set up quickly but the measurement accuracy is poor. When the indicator bubble is small, the leveling level is set up slowly but the measurement accuracy is improved. The device can be adjusted according to the accuracy requirements of actual engineering surveying, which improves its flexibility, adaptability and practicality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0017] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of the state component of the present invention.

[0020] Figure 3 This is the present invention. Figure 2 Enlarged structural diagram of part A in the middle.

[0021] Figure 4 This is the present invention. Figure 2 Enlarged structural diagram of part B in the middle.

[0022] Figure 5 This is a schematic diagram of the disassembled adjustment mechanism of the present invention.

[0023] Figure 6 This is a structural diagram of the disassembled indicating mechanism and observation mechanism of the present invention.

[0024] Figure 7 This is the present invention. Figure 6 Enlarged structural diagram of part C in the middle.

[0025] Figure 8 This invention is when Figure 2 A schematic diagram of the internal structure at the bottom.

[0026] Figure 9 This is a schematic diagram of the internal structure of the present invention when the pumping piston moves downward.

[0027] Figure 10 This is the present invention. Figure 9 Enlarged structural diagram of part D in the middle.

[0028] Figure 11 This is a schematic diagram of the internal structure of the present invention when the pumping piston moves upward.

[0029] Figure 12 This is the present invention. Figure 11 Enlarged structural diagram of part E in the middle.

[0030] List of reference numerals 1. Indicating mechanism; 101. Connecting rod; 1011. Piston chamber; 102. Sealing shell; 1021. Reference ring; 1022. Damping groove; 103. Pressure balance plate; 1031. Clearance spring; 2. Observation mechanism; 201. Rotating seat; 2011. Observation channel; 2012. Reflecting mirror; 202. Damping block; 2021. Damping top spring; 3. Adjustment mechanism; 301. Positioning screw; 302. Extraction / discharge piston; 303. Sealing block; 3031. Enlarging air passage; 3032. Decreasing air passage; 3033. Balance top spring; 4. Indicator bubble; 5. Level instrument.

[0031] It should be noted that, Figure 10 and Figure 12 The solid black arrows indicate the direction of gas flow, while the hollow black arrows indicate the direction of piston movement. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please refer to Figures 1 to 12 As shown: Example 1: The present invention provides an engineering measurement device with high measurement accuracy, including a status component, which consists of an indicating mechanism 1, an observation mechanism 2 and an adjustment mechanism 3; The indicating mechanism 1 includes a connecting rod 101, a sealing housing 102, and a pressure balance plate 103. The connecting rod 101 is fixedly installed on the side of the level instrument 5, and the sealing housing 102 is fixedly installed on the bottom of the connecting rod 101. The plane of the sealing housing 102 is parallel to the base plane of the level instrument 5. The interior of the sealing housing 102 is filled with a filling liquid and an indicating bubble 4. A reference ring 1021 is provided inside the top shell of the sealing housing 102. The pressure balance plate 103 is inserted into the interior of the sealing housing 102. The observation mechanism 2 includes a rotating seat 201 and a damping block 202. The rotating seat 201 is rotatably connected to the outside of the sealed housing 102, and the damping block 202 is inserted into the inside of the rotating seat 201. The adjusting mechanism 3 includes a positioning screw 301, a suction piston 302, and a sealing block 303. The positioning screw 301 is screwed into the inside of the connecting rod 101 through a rod thread, and the suction piston 302 is rotatably connected to the bottom of the connecting rod 101. The suction piston 302 is inserted into the inside of the connecting rod 101, and the sealing block 303 is inserted into the inside of the connecting rod 101.

[0034] In this embodiment, both the sealing shell 102 and the pressure balance plate 103 are transparent. The rotating base 201 has an "L"-shaped observation channel 2011 inside, and a reflecting mirror 2012 is provided at the corner of the observation channel 2011. The reflecting mirror 2012 is tilted at a 45-degree angle. In use, the indicator bubble 4 can indicate the levelness of the level instrument 5 by its position inside the reference ring 1021. When the indicator bubble 4 is located at the center of the reference ring 1021, it indicates that the sealing shell 102 is in a horizontal state. The level 5 is also in a horizontal state. The position of the indicator bubble 4 can be observed in real time through the observation mechanism 2. When observing through the observation channel 2011, the reflecting lens 2012 can reflect the position image of the indicator bubble 4 into the eyes of the person. Thus, the position of the indicator bubble 4 can be observed through the observation mechanism 2 and the leveling operation of the level 5 can be completed. It is convenient and flexible to use. The rotating base 201 can rotate with damping outside the sealed shell 102, which makes it convenient for people to observe the indicator bubble 4 from different positions and angles.

[0035] In this embodiment, the damping block 202 has a damping top spring 2021 inside, and the two ends of the damping top spring 2021 abut against the inside of the damping block 202 and the inside of the rotating seat 201, respectively. The end of the damping block 202 near the sealing shell 102 is semi-circular, and the outside of the sealing shell 102 has a damping groove 1022. The shape of a single groove of the damping groove 1022 is semi-circular. Under the action of the damping top spring 2021, the semi-circular part of the damping block 202 is inserted into the inside of the damping groove 1022. In use, under the action of the damping top spring 2021, the damping block 202 will be inserted into the inside of the damping groove 1022. The positioning of the rotating seat 201 facilitates observation and operation. When the rotating seat 201 is manually rotated, the force of the manual rotation is greater than the positioning force of the damping top spring 2021 on the damping block 202. Since one end of the damping block 202 is semi-circular, when the rotating seat 201 is manually rotated, the damping block 202 moves to one side to avoid the damping groove 1022 and engages with the next slot of the damping groove 1022 as the rotating seat 201 rotates. As the rotating seat 201 continues to rotate, the damping block 202 will continuously repeat the above actions, thereby providing rotational damping force for the rotating seat 201, which is convenient for adjustment and use.

[0036] In this embodiment, a balance spring 3033 is provided on the outside of the sealing block 303, and the two ends of the balance spring 3033 abut against the side of the sealing block 303 and the inside of the connecting rod 101, respectively. There are two balance springs 3033, and the two balance springs 3033 are symmetrically arranged on the outside of the sealing block 303. In use, when the sealing block 303 is in the reset state (i.e., the positioning screw 301 does not rotate), it can isolate the bottom opening of the piston cavity 1011 from the inside of the sealing shell 102. Under the action of the two balance springs 3033, when the sealing block 303 is in the reset state, the side openings of the enlarging air passage 3031 and the decreasing air passage 3032 will be blocked by the inner wall of the connecting rod 101, thereby preventing the filling liquid inside the piston cavity 1011 from entering the inside of the piston cavity 1011. At the same time, it also ensures the sealing performance inside the sealing shell 102, so that the indicating bubble 4 can stably cooperate with the reference ring 1021 to support the level 5, and the use is stable.

[0037] In this embodiment, the connecting rod 101 has a piston chamber 1011 inside, and the extraction piston 302 is disposed inside the piston chamber 1011. The bottom opening of the piston chamber 1011 is located at the center of the reference ring 1021, and the sealing block 303 is disposed at the bottom opening of the piston chamber 1011. The top of the piston chamber 1011 has an air passage communicating with the outside. In use, the size of the indicator bubble 4 can be adjusted by the adjustment mechanism 3, thereby facilitating the control and use of the level instrument 5 according to the accuracy requirements of actual engineering measurements. After the level 5 is adjusted to the middle position of the reference ring 1021, the adjustment operation can be achieved by rotating the positioning screw 301. When the positioning screw 301 is rotated, the positioning screw 301 can move up and down inside the connecting rod 101 through the rod thread. When the positioning screw 301 moves up and down, it can drive the pumping piston 302 to move synchronously. When the pumping piston 302 moves upward, the indicator bubble 4 will decrease, improving the setting accuracy of the level 5. When the pumping piston 302 moves downward, the indicator bubble 4 will increase, improving the setting speed of the level 5. It is convenient to adjust and flexible to use.

[0038] In this embodiment, the sealing block 303 has an "L"-shaped enlarging air passage 3031 inside. The bottom opening of the enlarging air passage 3031 is located on the side of the sealing block 303, and the top of the enlarging air passage 3031 communicates with the piston chamber 1011. The sealing block 303 also has an inverted "L"-shaped reducing air passage 3032 inside. The top opening of the reducing air passage 3032 is located on the side of the sealing block 303, and the bottom of the reducing air passage 3032 communicates with the interior of the sealing shell 102. In use, when the pumping piston 302 moves upward, the pressure change inside the piston chamber 1011 causes the sealing block 303 to move upward. When the sealing block 303 moves upward, the top of the reducing air passage 3032 enters the interior of the piston chamber 1011. At this time, the gas inside the indicator bubble 4 is drawn into the interior of the piston chamber 1011 by the reducing air passage 3032, and the indicator bubble 4... When the internal gas decreases, the indicator bubble 4 becomes smaller. At this time, the side opening of the enlarging air passage 3031 is still blocked. When the exhaust piston 302 moves downward, the internal pressure of the piston chamber 1011 will also change, causing the blocking block 303 to move downward. When the blocking block 303 moves downward, it will extend into the interior of the indicator bubble 4. The exhaust piston 302 can force the gas inside the piston chamber 1011 into the interior of the indicator bubble 4 through the enlarging air passage 3031. As a result, the gas inside the indicator bubble 4 increases, causing the indicator bubble 4 to become larger. At this time, the side opening of the decrementing air passage 3032 is still blocked. The control is stable and can adapt to the usage requirements of different level instruments 5 with different support accuracy. At the same time, the adjustable size design of the indicator bubble 4 also allows the status component to be installed on different engineering surveying instruments (such as total stations, theodolites, etc.) for use, making it highly adaptable.

[0039] In this embodiment, the bottom of the pressure balance plate 103 is provided with a relief spring 1031, and the two ends of the relief spring 1031 abut against the bottom of the pressure balance plate 103 and the inside of the sealing shell 102, respectively. In use, since the liquid cannot be compressed, when the size of the indicator bubble 4 changes, the pressure balance plate 103 will move up and down inside the sealing shell 102 under the action of the relief spring 1031, thereby adapting to the volume change of the gas-liquid whole composed of the indicator bubble 4 and the filling liquid, so as not to cause the sealing shell 102 to break or be damaged, and the use is stable.

[0040] The specific usage and function of this embodiment: In this invention, the size of the indicator bubble 4 is adjusted according to the actual required measurement accuracy of the level instrument 5 (measurement accuracy is the support accuracy; the higher the support accuracy, the higher the measurement accuracy). The size of the indicator bubble 4 can be adjusted by the adjustment mechanism 3, thereby facilitating the control and use of the level instrument 5 according to the accuracy requirements of actual engineering measurements. After adjusting the indicator bubble 4 to the middle position of the reference ring 1021 via the level instrument 5, the adjustment operation can be achieved by rotating the positioning screw 301. When the positioning screw 301 is rotated, the positioning screw 301 can move up and down inside the connecting rod 101 through the rod thread. When the positioning screw 301 moves up and down, it can drive the extraction piston 302 to move synchronously. When piston 302 moves upward, indicator bubble 4 decreases, improving the setting accuracy of level 5. When piston 302 moves downward, indicator bubble 4 increases, increasing the setting speed of level 5. When piston 302 moves upward, the pressure change inside piston chamber 1011 causes sealing block 303 to move upward. When sealing block 303 moves upward, the top of reducing air passage 3032 enters the piston chamber 1011, thus the gas inside indicator bubble 4 is drawn into piston chamber 1011 by reducing air passage 3032. The decrease in gas inside indicator bubble 4 causes indicator bubble 4 to become smaller, and the side opening of enlarging air passage 3031 remains blocked. When piston 302 moves downward, piston... Pressure changes also occur inside cavity 1011, causing the sealing block 303 to move downwards. As it moves downwards, the sealing block 303 extends into the indicator bubble 4. The extraction piston 302 forces the gas inside piston cavity 1011 into the indicator bubble 4 through the enlarging air passage 3031. This increases the gas volume inside the indicator bubble 4, causing it to enlarge. Meanwhile, the side opening of the reducing air passage 3032 remains blocked, ensuring stable control and adaptability to the different support accuracy requirements of various levels 5. The adjustable size of the indicator bubble 4 also allows the status component to be installed on different engineering surveying instruments. Since liquids are incompressible, when the size of the indicator bubble 4 changes, the pressure balance plate... Under the action of the avoidance spring 1031, 103 moves up and down inside the sealing shell 102 to adapt to the volume change of the gas-liquid mixture composed of the indicator bubble 4 and the filling liquid, preventing the sealing shell 102 from breaking or being damaged. When the sealing block 303 is in the reset state (i.e., the positioning screw 301 does not rotate), it can isolate the bottom opening of the piston chamber 1011 from the inside of the sealing shell 102. Under the action of the two balance springs 3033, when the sealing block 303 is in the reset state, the side openings of the enlarging air passage 3031 and the decreasing air passage 3032 are blocked by the inner wall of the connecting rod 101, thereby preventing the filling liquid inside the piston chamber 1011 from entering the piston chamber 1011, and also ensuring the sealing performance of the sealing shell 102.This allows the indicator bubble 4 to stably cooperate with the reference ring 1021 to maintain the support state of the leveling instrument 5. The indicator bubble 4, by its position inside the reference ring 1021, indicates the levelness of the leveling instrument 5. When the indicator bubble 4 is located at the center of the reference ring 1021, it indicates that the sealed outer shell 102 is in a horizontal state, meaning the leveling instrument 5 is also in a horizontal state. The position of the indicator bubble 4 can be observed in real time through the observation mechanism 2. When observing through the observation channel 2011, the reflecting lens 2012 can reflect the position image of the indicator bubble 4 into the viewer's eye. Thus, the position of the indicator bubble 4 can be observed through the observation mechanism 2, and the leveling operation of the leveling instrument 5 can be completed. It is convenient and flexible to use, and the rotating base 201 can rotate with damping outside the sealed outer shell 102, making it convenient for people to rotate from different positions and angles. For observing the indicator bubble 4, under the action of the damping top spring 2021, the damping block 202 will be inserted into the damping groove 1022, thereby positioning the rotating seat 201 and facilitating observation. When the rotating seat 201 is manually rotated, the force of the manual rotation is greater than the positioning force of the damping top spring 2021 on the damping block 202. Since one end of the damping block 202 is semi-circular, when the rotating seat 201 is manually rotated, the damping block 202 moves to one side to avoid the damping groove 1022, and then engages with the next slot in the damping groove 1022 as the rotating seat 201 rotates. As the rotating seat 201 continues to rotate, the damping block 202 will continuously repeat the above actions, thus providing rotational damping force for the rotating seat 201. After the setup is completed, engineering measurement operations can begin using the level 5.

[0041] In another embodiment, the top shell of the sealed housing 102 has an arc-shaped cross-section, which allows the indicator bubble 4 to move more smoothly during adjustment without jamming, and the reference ring 1021 is painted with a bright color for easy observation.

[0042] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0043] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0044] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A high-precision engineering measuring device, characterized in that, include: A status component, comprising an indicating mechanism (1), an observation mechanism (2), and an adjustment mechanism (3); The indicating mechanism (1) includes a connecting rod (101), a sealing shell (102), and a pressure balance plate (103). The connecting rod (101) is fixedly installed on the side of the level (5), and the sealing shell (102) is fixedly installed on the bottom of the connecting rod (101). The setting plane of the sealing shell (102) is parallel to the base plane of the level (5), and the interior of the sealing shell (102) is filled with filling liquid. The interior of the sealing shell (102) is filled with indicating air bubbles (4), and a reference ring (1021) is provided inside the top shell of the sealing shell (102). The pressure balance plate (103) is inserted into the interior of the sealing shell (102). The observation mechanism (2) includes a rotating seat (201) and a damping block (202). The rotating seat (201) is rotatably connected to the outside of the sealed housing (102), and the damping block (202) is inserted into the inside of the rotating seat (201). The adjustment mechanism (3) includes a positioning screw (301), a pumping piston (302), and a sealing block (303). The positioning screw (301) is screwed into the inside of the connecting rod (101) by the rod body thread, and the pumping piston (302) is rotatably connected to the bottom of the connecting rod (101). The pumping piston (302) is inserted into the inside of the connecting rod (101), and the sealing block (303) is inserted into the inside of the connecting rod (101).

2. The high-precision engineering measuring device as described in claim 1, characterized in that: The sealed outer shell (102) and the pressure balance plate (103) are both transparent, and the interior of the rotating seat (201) is provided with an "L"-shaped observation channel (2011), and a reflective lens (2012) is provided at the corner of the observation channel (2011), with the reflective lens (2012) tilted at a 45-degree angle.

3. The high-precision engineering measuring device as described in claim 2, characterized in that: The damping block (202) is provided with a damping top spring (2021) inside, and the two ends of the damping top spring (2021) abut against the inside of the damping block (202) and the inside of the rotating seat (201) respectively.

4. The high-precision engineering measuring device as described in claim 3, characterized in that: The damping block (202) has a semi-circular design at one end near the sealing shell (102), and the sealing shell (102) has a damping groove (1022) on the outside. The shape of a single groove of the damping groove (1022) is semi-circular. Under the action of the damping top spring (2021), the semi-circular part of the damping block (202) is inserted into the inside of the damping groove (1022).

5. The high-precision engineering measuring device as described in claim 4, characterized in that: The pressure balance plate (103) is provided with a relief top spring (1031) at the bottom, and the two ends of the relief top spring (1031) abut against the bottom of the pressure balance plate (103) and the inside of the sealing shell (102) respectively.

6. The high-precision engineering measuring device as described in claim 5, characterized in that: The connecting rod (101) has a piston chamber (1011) inside, and the extraction piston (302) is located inside the piston chamber (1011). The bottom opening of the piston chamber (1011) is located at the center of the reference ring (1021), and the sealing block (303) is located at the bottom opening of the piston chamber (1011). The top of the piston chamber (1011) has an air passage that communicates with the outside.

7. The high-precision engineering surveying device as described in claim 6, characterized in that: The sealing block (303) has an "L"-shaped enlarged air passage (3031) inside. The bottom opening of the enlarged air passage (3031) is located on the side of the sealing block (303), and the top of the enlarged air passage (3031) is connected to the piston chamber (1011).

8. The high-precision engineering measuring device as described in claim 7, characterized in that: The sealing block (303) has an inverted "L"-shaped reducing air passage (3032) inside. The top opening of the reducing air passage (3032) is located on the side of the sealing block (303), and the bottom of the reducing air passage (3032) is connected to the inside of the sealing shell (102).

9. The high-precision engineering measuring device as described in claim 8, characterized in that: The sealing block (303) is provided with a balance top spring (3033) on its outside, and the two ends of the balance top spring (3033) abut against the side of the sealing block (303) and the inside of the connecting rod (101) respectively. There are two balance top springs (3033), and the two balance top springs (3033) are symmetrically arranged on the outside of the sealing block (303).

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