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Instruction Manual for the DQL100-G1 Mine Suspension Compass

Release Date:

2021-06-22

DQL100-G1 type Mine Hanging Compass Instruction Manual

Uses of the instrument

DQL100-G1 The mining suspension compass and slope gauge are combined into a single set. As an auxiliary surveying instrument for mines.

The instrument is primarily used for measuring magnetic azimuths in secondary roadways of the mining area and at the working face, as well as the dip angles of compass-traverse lines.

Basic reference number

Compass instrument

(1) Magnetic needle length 100mm

(2) Minimum scale division of the dial 1 degree

(3) Estimate Read value 30 ′

(4) Instrument instrument and total weight of attachments quantity 0.5 kg

（ Two ) Slope gauge

(1) Outer diameter 200mm

(2) Minimum grid value 20 ′

(3) Instrument weight 50 g

III. Instrument Structure

DQL100-G1 The suspended compass for mining is composed of four main components: a curved-arm support assembly, a circular-ring frame assembly, a compass-box assembly, and a magnetic-needle assembly. The first three form a universal gimbal mount, which enables the compass box to remain balanced in any orientation.

IV. Instructions for Use

The instrument is supported and guided by a measuring rope, with centering and leveling performed by visual observation and readings taken accordingly.

After tensioning the surveying rope, first use a slope gauge to level it or measure its inclination angle, then suspend the compass to determine the magnetic declination. For ease of reading, align the zero mark on the compass dial with the forward direction being surveyed when suspending the instrument.

When the slope on the survey line is steep enough to prevent the survey rope from remaining horizontal, the step method should be used to divide the measurement into segments, with careful effort made to ensure that the survey rope in each segment lies parallel to the horizontal plane.

If ferromagnetic materials near the measurement point exert an influence, the cross-orientation method should be used to eliminate this effect: position the instrument at the center of the measurement point and perform directional measurements on both sides of the point, as shown in the figure. 2:O ₁ O ₂ O ₃ As a measurement point.

Instrument Structure

To minimize the influence of magnetic conductors, we list several objects during testing and use their minimum distances from the compass as reference values. :

Track to the Compass Instrument 1.5m

Mine cart to compass instrument 2-2.5m

Iron pipe to compass instrument 0.5m

From the mining lamp to the compass 0.5m

Also, pay attention to the markings on the steering wheel inside the instrument. : The “east” and “west” cardinal directions are opposite to the geographic directions.

Instrument inspection and maintenance

(1) Maintenance:

(1) The magnetic needle of the compass should have sufficient sensitivity.

The sensitivity of the magnetic needle is verified by suspending the instrument several times on the same measuring rope; each time, the readout should not differ by more than plus or minus 1 degree /2 The reduced sensitivity of the magnetic needle may be caused by dulling of the pivot on which the needle is supported, weakening of the needle’s magnetism, or the ingress of dust and dirt into the instrument; users should perform maintenance as appropriate based on the specific situation.

(2) When the compass dial is in a horizontal position, the magnetic needle should also be horizontal.

When taking a reading, the magnetic needle should be balanced and level. To achieve this balance, the position of the copper wire at one end of the needle can be adjusted.

Digital graduations on the compass instrument 0 degree -180 The diameter of the compass should coincide with the direction of the suspension cord used for the instrument. If, upon inspection, it is found that the compass diameter does not align with the cord, all readings will differ from the true value by a constant offset. To verify this, the compass is suspended twice: first with the zero end facing forward, and then with the reading 180 °Forward; at this point, the two readings should differ by 180 °. If this is not the case, the arithmetic mean must be calculated from the readings taken at the two positions of the instrument. Furthermore, throughout subsequent calculations, each instrument reading shall be used twice. When computing the arithmetic mean, the second reading must be either added to or subtracted from 180 °, in order to obtain the same magnetic azimuth.

(2) Maintenance :

(1) The instrument should not be placed in a humid environment or in an area with excessively high temperatures; if necessary, a suitable amount of desiccant may be placed inside the instrument’s wooden case to absorb moisture.

(2) When the instrument is not in use, the magnetic needle must be supported by the braking screw to prevent unnecessary wear on the pivot tip.

(3) If the interior of the instrument has become dirty over time, remove the glass cover and gently brush off surface dust with a soft-bristled brush, or lightly wipe it clean with a soft, fine cleaning cloth. Avoid excessive rubbing to prevent the scale lines and markings from becoming blurred and damaging the instrument.

(4) After use, the instrument should be placed in a wooden cabinet, and it is recommended that the magnetic poles of the compass needle be aligned with the geomagnetic poles, so as to maintain the needle’s magnetism for a long time.

(5) During use or transport, protect the instrument from impacts and any vibrations that could damage it.

VI. Appendices

（ 1 ) Instrument box

（ 2 ) Spring clip

（ 3 ) Instruction manual

（ 4 ) Slope gauge

（ 5 ) Instrument Certificate of Conformity

Magnetic Declination in Major and Medium-Sized Cities of China (2018)
Serial Number	Region	Magnetic Declination D
1	Beijing	6°52ʹ	(W)
2	Shanghai	5°57ʹ	(W)
3	Tianjin	6°55ʹ	(W)
4	Chongqing	2°27ʹ	(W)
5	Anshan	8°49ʹ	(W)
6	Baotou	4°51ʹ	(W)
7	Changchun	10°1′	(W)
8	Changsha	3°38ʹ	(W)
9	Chengdu	2 degrees and 2 minutes	(W)
10	Dalian	7°58ʹ	(W)
11	Fangchenggang	1°53ʹ	(W)
12	Fushun	9°12ʹ	(W)
13	Fuzhou	4°24ʹ	(W)
14	Guangzhou	2°50ʹ	(W)
15	Guiyang	2°10ʹ	(W)
16	Hangzhou	5°30ʹ	(W)
17	Harbin	10°45ʹ	(W)
18	Hefei	5°18ʹ	(W)
19	Hohhot	5°31ʹ	(W)
20	Jilin City	10°11ʹ	(W)
21	Jinan	6°17ʹ	(W)
22	Urumqi	2°52ʹ	(E)
23	Lhasa	0°8ʹ	(E)
24	Kashgar	3°59ʹ	(E)
25	Kunming	1 degree 23 minutes	(W)
26	Lanzhou	2°19ʹ	(W)
27	Luoyang	4°39ʹ	(W)
28	Nanchang	4°21ʹ	(W)
29	Nanjing	5°39ʹ	(W)
30	Qingdao	6°59ʹ	(W)
31	Qiqihar	10°45ʹ	(W)
32	Shenyang	9 degrees 5 minutes	(W)
33	Shijiazhuang	5°56ʹ	(W)
34	Taiyuan	5°17ʹ	(W)
35	Tangshan	7°18ʹ	(W)
36	Wuhan	4°22ʹ	(W)
37	Xi'an	3°37ʹ	(W)
38	Xining	1°49ʹ	(W)
39	Yinchuan	3°20ʹ	(W)
40	Zhengzhou	5°0ʹ	(W)
41	Kowloon, Hong Kong	2°52ʹ	(W)
42	Victoria Harbour, Hong Kong	2°50ʹ	(W)
43	Macao	2°44ʹ	(W)