Portable coal mine drilling deflection angle inclination measuring device and use method thereof

Abstract

The present invention discloses a portable coal mine drilling deflection angle and inclination measuring device and a method of using the same, and relates to the technical field of deflection angle and inclination measuring. The device comprises a vertical plate, and a semicircular plate is fixedly mounted on the upper end surface of the vertical plate, and the two end surfaces of the semicircular plate are provided with degrees of meridians marked in a regular pattern. The invention determines that the base is parallel to the wall of the coal mine by the cooperation of the top column and the airbag in the parallel component, and then uses the gravity ball and the indicator needle in the angle measuring component to be in the same straight line, and can measure the degree of deflection angle by using the indicator needle and the degree on the semicircular plate. At the same time, the auxiliary measurement component is used to perform synchronous measurement, and the accuracy of the measurement data is determined by comparing the two data. Finally, the measured degree is amplified by the amplification component, which is convenient for personnel to intuitively observe the measured angle degree, and the whole device has a simple structure, which is extremely convenient to carry and measure, thereby improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of deflection angle measurement, and in particular to a portable coal mine drilling deflection angle measurement device and a use method thereof. Background Art

[0002] Coal mine drilling angle and inclination measurement refers to the technology of measuring and controlling the deflection and inclination of the borehole during the coal mine drilling process. The main purpose is to ensure that the direction and posture of the borehole meet the design requirements and avoid problems such as the borehole deviating from the direction, tilting or getting stuck.

[0003] In the prior art, a Chinese patent with publication number "CN111594141A" discloses a portable coal mine drilling angle inclination measuring device. Even if the angle between the control plate and the pressure plate is very small, the float in the straight tube cavity will have a significant position change. The smaller the inner diameter of the straight tube cavity, the smaller the deformation of the bellows, which will also cause a significant change in the water column in the straight tube cavity. The function is stable and powerful, and the operation is convenient and fast, ensuring that the staff can quickly complete the drilling angle measurement work, solving the problem that the existing measuring equipment is cumbersome and difficult to operate and inconvenient to carry.

[0004] When measuring with existing measuring equipment, it is impossible to ensure that the measuring equipment is parallel to the wall of the coal mine, resulting in inaccurate measured data. In addition, after measuring once, personnel will conduct a second measurement to ensure the accuracy of the data, which increases the measurement time and cost. At the same time, since the degree displayed on the measuring equipment is small in size, it is extremely inconvenient for personnel to observe and it takes time to determine the degree. Therefore, the present invention proposes a portable coal mine drilling deflection and inclination measuring device and a method of using the same to solve the above-mentioned problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a portable coal mine drilling deflection angle and inclination measuring device and a method of using the same, which solves the problems mentioned in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A portable coal mine drilling deflection angle inclination measuring device comprises a vertical plate, a semicircular plate is fixedly mounted on the upper end surface of the vertical plate, and degrees of meridians are regularly marked on both end surfaces of the semicircular plate, the center top position of the semicircular plate is set to degree 0, and the center two sides of the semicircular plate are set to degree 90;

[0008] An angle measuring component is arranged between the vertical plate and the semicircular plate, a base is fixedly mounted on the lower end surface of the vertical plate, an auxiliary measuring component is arranged on the base, and the angle measuring component and the auxiliary measuring component point out corresponding degrees under the influence of gravity;

[0009] The base is provided with a parallel component, through which the vertical plate is made parallel to the wall surface of the coal mine to be measured;

[0010] An amplifying component is arranged on the outer side of the vertical plate, and the degree specified by the protractor component can be easily known to personnel through the amplifying component.

[0011] Preferably, the protractor assembly includes a rotating shaft rotatably installed between the vertical plate and the semicircular plate, limit plates are fixedly installed at both ends of the rotating shaft, a rotating plate is fixedly installed on the rotating shaft, an indicator needle is fixedly installed on the top of the rotating plate, a connecting plate is fixedly installed on the lower end surface of the rotating plate, a hanging rope is fixedly installed on the connecting plate, a limit ball is fixedly installed on one end of the hanging rope away from the connecting plate, a gravity ball is slidably connected to the hanging rope, a positioning block is fixedly installed on the rotating shaft and inside the rotating plate, and the rotating plate is limited by the positioning block.

[0012] Preferably, the auxiliary measurement component includes a U-shaped frame fixedly mounted on a base, a cylindrical glass box fixedly mounted on the U-shaped frame, both end faces of the glass box are provided with degrees of meridians marked in a regular pattern, the center top position of the glass box is set to degree 0, and the center two side positions of the glass box are set to degree 90, red clear water is provided inside the glass box, and the volume of the clear water is half of the volume of the glass box, and by comparing the data of the glass box and the semicircular plate, the measured angle data is made more accurate.

[0013] Preferably, the parallel component includes an inner cavity arranged on the base, a plurality of through holes are opened at the inner bottom of the inner cavity, an airbag is fixedly installed on the inner top of the inner cavity, a plurality of top columns are fixedly installed on the lower end surface of the airbag, and one end of the top column away from the airbag passes through the through hole and extends to the outside of the inner cavity.

[0014] Preferably, the airbag is fixedly connected to a ventilation pipe, on which a valve is provided, and one end of the ventilation pipe away from the airbag extends to above the base. The airbag is inflated by filling gas into the airbag, so that the top column fits against the uneven surface, and the base is parallel to the wall of the coal mine.

[0015] Preferably, the magnifying component includes a positioning column fixedly mounted on a semicircular plate, a first magnifying lens in a semi-ring shape is fixedly mounted on the positioning column, a driving shaft is rotatably connected to the base, a positioning plate is fixedly mounted on the end of the driving shaft away from the base, a driving plate is rotatably connected to the positioning plate, and a second magnifying lens is fixedly mounted on the top of the driving plate.

[0016] Preferably, a limit block is fixedly installed on the driving shaft and inside the driving plate, and the driving plate is located outside the first magnifying lens through the limit block. Through the coordinated use of the first magnifying lens and the second magnifying lens, the degree indicated by the indicator needle is easy for people to observe.

[0017] Preferably, a lifting frame is fixedly mounted on the upper end surface of the semicircular plate, and the lifting frame is set to be U-shaped.

[0018] A portable coal mine drilling deflection angle inclination measurement method, based on the portable coal mine drilling deflection angle inclination measurement device described above, comprises the following steps:

[0019] S1. Place the base on the wall of the coal mine to be measured by holding the lifting frame, and press the entire device, then use an external device to pass solid oxygen into the air bag in the parallel assembly, and through the inflation of the air bag, multiple top columns are pressed against the groove of the coal mine through the through hole, so that the base and the wall of the coal mine are in a parallel state, and then measurement is carried out;

[0020] S2. During measurement, the gravity ball in the angle measuring assembly will be affected by gravity and perpendicular to the ground, and the needle of the indicator needle will point to the degree on the semicircular plate through the action of the rotating plate. The angle to be measured is determined by observing the degree. At the same time, the red water in the glass box in the auxiliary measuring assembly is always in a horizontal state. Since the glass box is in an inclined state, the angle formed by the horizontal red water and the glass box can be determined by the degree of the glass box. The accuracy of the measured angle can be determined by comparing the two degrees.

[0021] S3. When recording the degree, the degree indicated by the indicator needle will be magnified by the first magnifying lens, and the personnel can rotate the driving plate, which will use the driving shaft to rotate the angle. After the rotation, the driving plate will rotate the second magnifying lens to the front side of the first magnifying lens. Through the overlap of the first magnifying lens and the second magnifying lens, the degree on the semicircular plate will be magnified several times, which is convenient for personnel to intuitively observe the measured angle degree.

[0022] The present invention provides a portable coal mine drilling deflection angle measurement device and a method for using the same. Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention makes the base parallel to the wall of the coal mine to be measured, and the gravity ball in the angle measuring assembly will be perpendicular to the ground under the influence of gravity, and the rotating plate will rotate through the rotating shaft. Since the indicator needle and the gravity ball are on the same straight line, the needle head of the indicator needle will point to the degree on the semicircular plate through the action of the rotating plate, and the measured angle can be determined by observing the degree on the semicircular plate;

[0024] 2. The present invention uses the auxiliary measuring component to ensure that the red water in the glass box is always in a horizontal state. Since the glass box is in an inclined state, the angle formed by the horizontal red water and the glass box can be determined by the degree on the glass box. The accuracy of the measured angle can be determined by comparing the two degrees.

[0025] 3. The present invention introduces solid oxygen into the airbag in the parallel assembly through the ventilation pipe. The airbag swells, so that multiple top columns are pressed against the grooves on the wall of the coal mine through the through holes. The top columns are pressed against the base and the wall of the coal mine to ensure the parallel relationship between the equipment and the wall of the coal mine, thereby improving the accuracy and stability of the measurement. At the same time, the combination of the airbag and the top column can also keep the equipment stable and not easy to move in the coal mine, thereby ensuring the reliability of the measurement results.

[0026] 4. When recording the degree, the degree indicated by the indicator needle will be magnified for the first time through the first magnifying lens, and the personnel can rotate the driving plate, and the driving plate will use the driving shaft to rotate the angle. After the rotation, the driving plate will rotate the second magnifying lens to the front side of the first magnifying lens. Through the overlap of the first magnifying lens and the second magnifying lens, the degree on the semicircular plate will be magnified several times, which is convenient for personnel to intuitively observe the measured angle degree, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 3 is a cross-sectional view of the present invention;

[0030] Figure 4 Figure 3 The enlarged view of point A in the middle;

[0031] Figure 5 Figure 3 The enlarged view of point B in the middle;

[0032] Figure 6 It is a front view of the semicircular plate in the present invention;

[0033] Figure 7 It is a schematic diagram of the structure of the angle measuring assembly in the present invention.

[0034] In the figure: 1. vertical plate; 2. semicircular plate; 3. base; 4. rotating shaft; 5. limit plate; 6. rotating plate; 7. indicator needle; 8. connecting plate; 9. lifting rope; 10. limit ball; 11. gravity ball; 12. positioning block; 13. U-shaped frame; 14. glass box; 15. inner cavity; 16. through hole; 17. air bag; 18. mounting plate; 19. top column; 20. ventilation pipe; 21. positioning column; 22. first magnifying lens; 23. driving shaft; 24. positioning plate; 25. driving plate; 26. second magnifying lens; 27. limit block; 28. lifting frame; 29. ​​valve. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figure 1-Figure 7 The present invention is a portable coal mine drilling deflection angle inclination measuring device, comprising a vertical plate 1, a semicircular plate 2 is fixedly installed on the upper end surface of the vertical plate 1, and degrees of meridians are regularly marked on the two end surfaces of the semicircular plate 2. The center top position of the semicircular plate 2 is set to degree 0, and the center two side positions of the semicircular plate 2 are set to degree 90. An angle measuring component is arranged between the vertical plate 1 and the semicircular plate 2, and a base 3 is fixedly installed on the lower end surface of the vertical plate 1. An auxiliary measuring component is arranged on the base 3. The angle measuring component and the auxiliary measuring component indicate corresponding degrees through the influence of gravity, wherein the semicircular plate 2 is divided into two parts, one half is 0-90 degrees, and the other half is also 0-90 degrees, which is convenient for angle measurement of inclined coal mine wall.

[0037] The angle measuring assembly includes a rotating shaft 4 rotatably installed between a vertical plate 1 and a semicircular plate 2, limit plates 5 are fixedly installed at both ends of the rotating shaft 4, a rotating plate 6 is fixedly installed on the rotating shaft 4, an indicator needle 7 is fixedly installed on the top of the rotating plate 6, a connecting plate 8 is fixedly installed on the lower end surface of the rotating plate 6, a hanging rope 9 is fixedly installed on the connecting plate 8, a limit ball 10 is fixedly installed on the end of the hanging rope 9 away from the connecting plate 8, a gravity ball 11 is slidably connected to the hanging rope 9, a positioning block 12 is fixedly installed on the rotating shaft 4 and inside the rotating plate 6, the rotating plate 6 is limited by the positioning block 12, the stability of the rotating plate 6 during rotation is guaranteed by the limiting of the positioning block 12, and the position displacement phenomenon will not occur, and the gravity ball 11 will not fall off the hanging rope 9 by the action of the limiting ball 10.

[0038] In this embodiment, the base 3 is made parallel to the coal mine wall to be measured, the gravity ball 11 in the protractor assembly will be perpendicular to the ground due to the influence of gravity, the rotating plate 6 will rotate through the rotating shaft 4, and the indicator needle 7 and the gravity ball 11 are on the same straight line, and the needle tip of the indicator needle 7 will point to the degree on the semicircular plate 2 through the action of the rotating plate 6, and the measured angle is determined by observing the degree on the semicircular plate 2.

[0039] Example 2: Please refer to Figure 1-Figure 7 On the basis of the first embodiment, the auxiliary measurement component includes a U-shaped frame 13 fixedly mounted on the base 3, a cylindrical glass box 14 is fixedly mounted on the U-shaped frame 13, and the two end faces of the glass box 14 are provided with degrees of meridians marked according to a regular pattern, the center top position of the glass box 14 is set to degree 0, and the center two side positions of the glass box 14 are set to degree 90. Red clean water is provided inside the glass box 14, and the volume of the clean water is half of the volume of the glass box 14. By comparing the data of the glass box 14 and the semicircular plate 2, the measured angle data is more accurate. Since the glass box 14 is transparent, in order to make the measured angle clearly reflected, the red clean water is obtained by dropping red potion into the clean water, so that the presented degree is easier to be observed by personnel.

[0040] In this embodiment, the red water in the glass box 14 of the auxiliary measuring component is always in a horizontal state. Since the glass box 14 is in an inclined state, the angle formed by the horizontal red water and the glass box 14 can be determined by the degrees on the glass box 14. The accuracy of the measured angle can be determined by comparing the two degrees.

[0041] Example 3: Please refer to Figure 1-Figure 7 On the basis of the first embodiment, a parallel component is arranged on the base 3, and the vertical plate 1 is made parallel to the coal mine wall to be measured by the parallel component. The parallel component includes an inner cavity 15 arranged on the base 3, and a plurality of through holes 16 are opened on the inner bottom of the inner cavity 15. An air bag 17 is fixedly installed on the inner top of the inner cavity 15, and a plurality of mounting plates 18 are fixedly installed on the lower end surface of the air bag 17. A top column 19 is fixedly connected to the mounting plate 18, and one end of the top column 19 away from the air bag 17 passes through the through hole 16 and extends to the outside of the inner cavity 15. A ventilation pipe 20 is fixedly connected to the air bag 17, and a valve 29 is arranged on the ventilation pipe 20. One end of the ventilation pipe 20 away from the air bag 17 extends to the top of the base 3. The air bag 17 is inflated by filling gas into the air bag 17, so that the top column 19 fits with the uneven surface, so that the base 3 and the coal mine wall are in a parallel state.

[0042] In this embodiment, solid oxygen is introduced into the airbag 17 in the parallel assembly through the ventilation pipe 20. The airbag 17 is bulged, so that multiple top columns 19 are pressed against the grooves on the wall of the coal mine through the through holes 16. The top columns 19 are pressed against the base 3 and the wall of the coal mine, ensuring the parallel relationship between the equipment and the wall of the coal mine, thereby improving the accuracy and stability of the measurement. At the same time, the combination of the airbag 17 and the top columns 19 can also keep the equipment stable and not easy to move in the coal mine, thereby ensuring the reliability of the measurement results.

[0043] Example 4: Please refer to Figure 1-Figure 7 On the basis of the first embodiment, an amplifying component is arranged on the outer side of the vertical plate 1, and the degree specified by the protractor component is easily known to personnel through the amplifying component. The amplifying component includes a positioning column 21 fixedly mounted on the semicircular plate 2, and a first semi-ring-shaped magnifying lens 22 is fixedly mounted on the positioning column 21. A driving shaft 23 is rotatably connected to the base 3, and a positioning plate 24 is fixedly mounted on the end of the driving shaft 23 away from the base 3, and a driving plate 25 is rotatably connected to the positioning plate 24, and a second magnifying lens 26 is fixedly mounted on the top of the driving plate 25; a limiting block 27 is fixedly mounted on the driving shaft 23 and inside the driving plate 25, and the driving plate 25 is located on the outer side of the first magnifying lens 22 through the limiting block 27. Through the coordinated use of the first magnifying lens 22 and the second magnifying lens 26, the degree indicated by the indicator needle 7 is convenient for personnel to observe.

[0044] In this embodiment, when recording the degree, the degree indicated by the indicator needle 7 will be magnified for the first time through the first magnifying lens 22, and the personnel can rotate the driving plate 25, and the driving plate 25 will use the driving shaft 23 to rotate the angle. After the rotation, the driving plate 25 will rotate the second magnifying lens 26 to the front side of the first magnifying lens 22. Through the overlap of the first magnifying lens 22 and the second magnifying lens 26, the degree on the semicircular plate 2 will be magnified several times, so that the personnel can intuitively observe the measured angle degree.

[0045] A lifting frame 28 is fixedly mounted on the upper end surface of the semicircular plate 2 , and the lifting frame 28 is set to be U-shaped.

[0046] A portable coal mine drilling deflection angle inclination measurement method, based on the above-mentioned portable coal mine drilling deflection angle inclination measurement device, comprises the following steps:

[0047] S1. Place the base 3 on the wall of the coal mine to be measured by holding the lifting frame 28, and press the entire device, then use an external device to pass solid oxygen into the air bag 17 in the parallel assembly, and through the bulging of the air bag 17, multiple top columns 19 are pressed against the groove of the coal mine through the through hole 16, so that the base 3 is in a parallel state with the wall of the coal mine, and then measure;

[0048] S2. During measurement, the gravity ball 11 in the angle measuring assembly will be affected by gravity and perpendicular to the ground, wherein the needle of the indicator needle 7 will point to the degree on the semicircular plate 2 through the action of the rotating plate 6, and the angle to be measured is determined by observing the degree. At the same time, the red water in the glass box 14 in the auxiliary measuring assembly is always in a horizontal state. Since the glass box 14 is in an inclined state, the angle formed by the horizontal red water and the glass box 14 can be determined by the degree of the glass box 14. The accuracy of the measured angle can be determined by comparing the two degrees.

[0049] S3. When recording the degree, the degree indicated by the indicator needle 7 will be magnified by the first magnifying lens 22, and the personnel can rotate the driving plate 25, and the driving plate 25 will use the driving shaft 23 to rotate the angle. After the rotation, the driving plate 25 will rotate the second magnifying lens 26 to the front side of the first magnifying lens 22. Through the overlap of the first magnifying lens 22 and the second magnifying lens 26, the degree on the semicircular plate 2 will be magnified several times, so that the personnel can intuitively observe the measured angle degree.

[0050] Working principle: When in use, solid oxygen is introduced into the air bag 17 through the ventilation pipe 20. The air bag 17 swells, so that multiple top columns 19 are pressed against the grooves on the wall of the coal mine through the through holes 16. The top columns 19 are pressed against the base 3 and the wall of the coal mine, ensuring the parallel relationship between the equipment and the wall of the coal mine.

[0051] During measurement, by making the base 3 parallel to the wall of the coal mine to be measured, the gravity ball 11 will be affected by gravity and perpendicular to the ground, and the rotating plate 6 will rotate through the rotating shaft 4. Since the indicator needle 7 and the gravity ball 11 are on the same straight line, the needle head of the indicator needle 7 will point to the degree on the semicircular plate 2 through the action of the rotating plate 6, and the measured angle can be determined by observing the degree on the semicircular plate 2;

[0052] At the same time, the red water in the glass box 14 on the base 3 is always in a horizontal state. Since the glass box 14 is in an inclined state, the angle formed by the red water in a horizontal state and the glass box 14 can be determined by the degree on the glass box 14. The accuracy of the measured angle can be determined by comparing the two degrees.

[0053] When recording the degree, the degree indicated by the indicator needle 7 will be magnified for the first time through the first magnifying lens 22, and the personnel can rotate the driving plate 25, and the driving plate 25 will use the driving shaft 23 to rotate the angle. After the rotation, the driving plate 25 will rotate the second magnifying lens 26 to the front side of the first magnifying lens 22. Through the overlap of the first magnifying lens 22 and the second magnifying lens 26, the degree on the semicircular plate 2 will be magnified several times, so that the personnel can intuitively observe the measured angle degree.

[0054] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0055] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A portable coal mine drilling deflection angle inclination measurement method, characterized in that: The following steps are involved: S1. Place the base (3) on the wall of the coal mine to be measured by holding the lifting frame (28) and press the entire device. Then, use an external device to pass solid oxygen into the air bag (17) in the parallel assembly. Through the expansion of the air bag (17), multiple top columns (19) are pressed against the groove of the coal mine through the through hole (16), so that the base (3) and the wall of the coal mine are in a parallel state, and then measurement is performed; S2. During measurement, the gravity ball (11) in the angle measuring assembly will be affected by gravity and perpendicular to the ground, wherein the needle of the indicator needle (7) will point to the degree on the semicircular plate (2) through the action of the rotating plate (6), and the angle to be measured is determined by observing the degree. At the same time, the red water in the glass box (14) in the auxiliary measuring assembly is always in a horizontal state. Since the glass box (14) is in an inclined state, the angle formed by the horizontal red water and the glass box (14) can be determined by the degree of the glass box (14). The accuracy of the measured angle is determined by comparing the two degrees. S3. When recording the degree, the degree indicated by the indicator needle (7) is magnified for the first time through the first magnifying lens (22), and the personnel can rotate the driving plate (25), and the driving plate (25) will use the driving shaft (23) to rotate the angle. After the rotation of the driving plate (25), the second magnifying lens (26) will be rotated to the front side of the first magnifying lens (22). Through the overlap of the first magnifying lens (22) and the second magnifying lens (26), the degree on the semicircular plate (2) is magnified several times, so that the personnel can intuitively observe the measured angle degree; The measuring device comprises a vertical plate (1), a semicircular plate (2) being fixedly mounted on the upper end surface of the vertical plate (1), and degrees of meridians being marked in a regular pattern on both end surfaces of the semicircular plate (2), the center top position of the semicircular plate (2) being set to degree 0, and the center two side positions of the semicircular plate (2) being set to degree 90; An angle measuring assembly is arranged between the vertical plate (1) and the semicircular plate (2), the angle measuring assembly comprising a rotating shaft (4) rotatably mounted between the vertical plate (1) and the semicircular plate (2), limiting plates (5) being fixedly mounted at both ends of the rotating shaft (4), a rotating plate (6) being fixedly mounted on the rotating shaft (4), an indicator needle (7) being fixedly mounted on the top end of the rotating plate (6), a connecting plate (8) being fixedly mounted on the lower end surface of the rotating plate (6), a hanging rope (9) being fixedly mounted on the connecting plate (8), a limiting ball (10) being fixedly mounted on one end of the hanging rope (9) away from the connecting plate (8), a gravity ball (11) being slidably connected to the hanging rope (9), a positioning block (12) being fixedly mounted on the rotating shaft (4) and inside the rotating plate (6), and the rotating plate (6) is limited by the positioning block (12); A base (3) is fixedly mounted on the lower end surface of the vertical plate (1), and an auxiliary measurement component is arranged on the base (3). Under the influence of gravity, the angle measuring component and the auxiliary measurement component indicate corresponding degrees. The auxiliary measurement component comprises a U-shaped frame (13) fixedly mounted on the base (3), and a cylindrical glass box (14) is fixedly mounted on the U-shaped frame (13). The two end surfaces of the glass box (14) are both provided with degrees of meridians marked in a regular pattern. The center top position of the glass box (14) is set to degree 0, and the center two side positions of the glass box (14) are set to degree 90. Red clear water is arranged inside the glass box (14), and the volume of the clear water is half of the volume of the glass box (14). By comparing the data of the glass box (14) and the semicircular plate (2), the measured angle data is made more accurate. The base (3) is provided with a parallel assembly, through which the vertical plate (1) is parallel to the coal mine wall to be measured, the parallel assembly comprising an inner cavity (15) provided on the base (3), the inner bottom of the inner cavity (15) being provided with a plurality of through holes (16), an air bag (17) being fixedly mounted on the inner top of the inner cavity (15), a plurality of mounting plates (18) being fixedly mounted on the lower end surface of the air bag (17), a top column (19) being fixedly connected to the mounting plate (18), the top column (19) being remote from the top of the inner cavity (15). One end away from the airbag (17) passes through the through hole (16) and extends to the outside of the inner cavity (15); the airbag (17) is fixedly connected to a ventilation pipe (20); the ventilation pipe (20) is provided with a valve (29); one end of the ventilation pipe (20) away from the airbag (17) extends to above the base (3); by filling the airbag (17) with gas to inflate the airbag (17), the top column (19) is fitted with an uneven surface, so that the base (3) is parallel to the wall of the coal mine; An amplifying component is arranged on the outer side of the vertical plate (1), and the degree specified by the protractor component is easily known to a person through the amplifying component. The amplifying component comprises a positioning column (21) fixedly mounted on the semicircular plate (2), a first magnifying lens (22) in a semi-circular shape fixedly mounted on the positioning column (21), a driving shaft (23) rotatably connected to the base (3), a positioning plate (24) fixedly mounted on one end of the driving shaft (23) away from the base (3), a driving plate (25) rotatably connected to the positioning plate (24), and the driving plate (25) A second magnifying lens (26) is fixedly mounted on the top of the semicircular plate (2); a limit block (27) is fixedly mounted on the driving shaft (23) and inside the driving plate (25); the limit block (27) enables the driving plate (25) to be located outside the first magnifying lens (22); and the first magnifying lens (22) and the second magnifying lens (26) are used in combination to make the degree indicated by the indicator needle (7) easy for people to observe; a lifting frame (28) is fixedly mounted on the upper end surface of the semicircular plate (2); and the lifting frame (28) is set to be U-shaped.

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